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| author | Tom Tromey <tom@tromey.com> | 2020-02-08 13:40:54 -0700 |
|---|---|---|
| committer | Tom Tromey <tom@tromey.com> | 2020-02-08 13:40:59 -0700 |
| commit | 82ca895718becbd1be898a86e4a6d1217fa496c6 (patch) | |
| tree | 9678baae2a5c7c9772cb39b917bc87114d3261fc /gdb/dwarf2read.c | |
| parent | 9e35d4996169bc7fa833e8449585d517b8ccc5f8 (diff) | |
| download | binutils-82ca895718becbd1be898a86e4a6d1217fa496c6.zip binutils-82ca895718becbd1be898a86e4a6d1217fa496c6.tar.gz binutils-82ca895718becbd1be898a86e4a6d1217fa496c6.tar.bz2 | |
Move DWARF code to dwarf2/ subdirectory
This moves all the remaining DWARF code to the new dwarf2
subdirectory. This is just a simple renaming, with updates to
includes as needed.
gdb/ChangeLog
2020-02-08 Tom Tromey <tom@tromey.com>
* dwarf2/expr.c: Rename from dwarf2expr.c.
* dwarf2/expr.h: Rename from dwarf2expr.h.
* dwarf2/frame-tailcall.c: Rename from dwarf2-frame-tailcall.c.
* dwarf2/frame-tailcall.h: Rename from dwarf2-frame-tailcall.h.
* dwarf2/frame.c: Rename from dwarf2-frame.c.
* dwarf2/frame.h: Rename from dwarf2-frame.h.
* dwarf2/index-cache.c: Rename from dwarf-index-cache.c.
* dwarf2/index-cache.h: Rename from dwarf-index-cache.h.
* dwarf2/index-common.c: Rename from dwarf-index-common.c.
* dwarf2/index-common.h: Rename from dwarf-index-common.h.
* dwarf2/index-write.c: Rename from dwarf-index-write.c.
* dwarf2/index-write.h: Rename from dwarf-index-write.h.
* dwarf2/loc.c: Rename from dwarf2loc.c.
* dwarf2/loc.h: Rename from dwarf2loc.h.
* dwarf2/read.c: Rename from dwarf2read.c.
* dwarf2/read.h: Rename from dwarf2read.h.
* dwarf2/abbrev.c, aarch64-tdep.c, alpha-tdep.c,
amd64-darwin-tdep.c, arc-tdep.c, arm-tdep.c, bfin-tdep.c,
compile/compile-c-symbols.c, compile/compile-cplus-symbols.c,
compile/compile-loc2c.c, cris-tdep.c, csky-tdep.c, findvar.c,
gdbtypes.c, guile/scm-type.c, h8300-tdep.c, hppa-bsd-tdep.c,
hppa-linux-tdep.c, i386-darwin-tdep.c, i386-linux-tdep.c,
i386-tdep.c, iq2000-tdep.c, m32c-tdep.c, m68hc11-tdep.c,
m68k-tdep.c, microblaze-tdep.c, mips-tdep.c, mn10300-tdep.c,
msp430-tdep.c, nds32-tdep.c, nios2-tdep.c, or1k-tdep.c,
riscv-tdep.c, rl78-tdep.c, rs6000-tdep.c, rx-tdep.c, s12z-tdep.c,
s390-tdep.c, score-tdep.c, sh-tdep.c, sparc-linux-tdep.c,
sparc-tdep.c, sparc64-linux-tdep.c, sparc64-tdep.c, tic6x-tdep.c,
tilegx-tdep.c, v850-tdep.c, xstormy16-tdep.c, xtensa-tdep.c:
Update.
* Makefile.in (COMMON_SFILES): Update.
(HFILES_NO_SRCDIR): Update.
Change-Id: Ied9ce1436cd27ac4a4cffef10ec92e396f181928
Diffstat (limited to 'gdb/dwarf2read.c')
| -rw-r--r-- | gdb/dwarf2read.c | 25534 |
1 files changed, 0 insertions, 25534 deletions
diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c deleted file mode 100644 index 0531197..0000000 --- a/gdb/dwarf2read.c +++ /dev/null @@ -1,25534 +0,0 @@ -/* DWARF 2 debugging format support for GDB. - - Copyright (C) 1994-2020 Free Software Foundation, Inc. - - Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology, - Inc. with support from Florida State University (under contract - with the Ada Joint Program Office), and Silicon Graphics, Inc. - Initial contribution by Brent Benson, Harris Computer Systems, Inc., - based on Fred Fish's (Cygnus Support) implementation of DWARF 1 - support. - - This file is part of GDB. - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 3 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program. If not, see <http://www.gnu.org/licenses/>. */ - -/* FIXME: Various die-reading functions need to be more careful with - reading off the end of the section. - E.g., load_partial_dies, read_partial_die. */ - -#include "defs.h" -#include "dwarf2read.h" -#include "dwarf2/abbrev.h" -#include "dwarf2/attribute.h" -#include "dwarf-index-cache.h" -#include "dwarf-index-common.h" -#include "dwarf2/leb.h" -#include "bfd.h" -#include "elf-bfd.h" -#include "symtab.h" -#include "gdbtypes.h" -#include "objfiles.h" -#include "dwarf2.h" -#include "buildsym.h" -#include "demangle.h" -#include "gdb-demangle.h" -#include "filenames.h" /* for DOSish file names */ -#include "macrotab.h" -#include "language.h" -#include "complaints.h" -#include "dwarf2expr.h" -#include "dwarf2loc.h" -#include "cp-support.h" -#include "hashtab.h" -#include "command.h" -#include "gdbcmd.h" -#include "block.h" -#include "addrmap.h" -#include "typeprint.h" -#include "psympriv.h" -#include "c-lang.h" -#include "go-lang.h" -#include "valprint.h" -#include "gdbcore.h" /* for gnutarget */ -#include "gdb/gdb-index.h" -#include "gdb_bfd.h" -#include "f-lang.h" -#include "source.h" -#include "build-id.h" -#include "namespace.h" -#include "gdbsupport/function-view.h" -#include "gdbsupport/gdb_optional.h" -#include "gdbsupport/underlying.h" -#include "gdbsupport/hash_enum.h" -#include "filename-seen-cache.h" -#include "producer.h" -#include <fcntl.h> -#include <algorithm> -#include <unordered_map> -#include "gdbsupport/selftest.h" -#include "rust-lang.h" -#include "gdbsupport/pathstuff.h" - -/* When == 1, print basic high level tracing messages. - When > 1, be more verbose. - This is in contrast to the low level DIE reading of dwarf_die_debug. */ -static unsigned int dwarf_read_debug = 0; - -/* When non-zero, dump DIEs after they are read in. */ -static unsigned int dwarf_die_debug = 0; - -/* When non-zero, dump line number entries as they are read in. */ -static unsigned int dwarf_line_debug = 0; - -/* When true, cross-check physname against demangler. */ -static bool check_physname = false; - -/* When true, do not reject deprecated .gdb_index sections. */ -static bool use_deprecated_index_sections = false; - -static const struct objfile_key<dwarf2_per_objfile> dwarf2_objfile_data_key; - -/* The "aclass" indices for various kinds of computed DWARF symbols. */ - -static int dwarf2_locexpr_index; -static int dwarf2_loclist_index; -static int dwarf2_locexpr_block_index; -static int dwarf2_loclist_block_index; - -/* An index into a (C++) symbol name component in a symbol name as - recorded in the mapped_index's symbol table. For each C++ symbol - in the symbol table, we record one entry for the start of each - component in the symbol in a table of name components, and then - sort the table, in order to be able to binary search symbol names, - ignoring leading namespaces, both completion and regular look up. - For example, for symbol "A::B::C", we'll have an entry that points - to "A::B::C", another that points to "B::C", and another for "C". - Note that function symbols in GDB index have no parameter - information, just the function/method names. You can convert a - name_component to a "const char *" using the - 'mapped_index::symbol_name_at(offset_type)' method. */ - -struct name_component -{ - /* Offset in the symbol name where the component starts. Stored as - a (32-bit) offset instead of a pointer to save memory and improve - locality on 64-bit architectures. */ - offset_type name_offset; - - /* The symbol's index in the symbol and constant pool tables of a - mapped_index. */ - offset_type idx; -}; - -/* Base class containing bits shared by both .gdb_index and - .debug_name indexes. */ - -struct mapped_index_base -{ - mapped_index_base () = default; - DISABLE_COPY_AND_ASSIGN (mapped_index_base); - - /* The name_component table (a sorted vector). See name_component's - description above. */ - std::vector<name_component> name_components; - - /* How NAME_COMPONENTS is sorted. */ - enum case_sensitivity name_components_casing; - - /* Return the number of names in the symbol table. */ - virtual size_t symbol_name_count () const = 0; - - /* Get the name of the symbol at IDX in the symbol table. */ - virtual const char *symbol_name_at (offset_type idx) const = 0; - - /* Return whether the name at IDX in the symbol table should be - ignored. */ - virtual bool symbol_name_slot_invalid (offset_type idx) const - { - return false; - } - - /* Build the symbol name component sorted vector, if we haven't - yet. */ - void build_name_components (); - - /* Returns the lower (inclusive) and upper (exclusive) bounds of the - possible matches for LN_NO_PARAMS in the name component - vector. */ - std::pair<std::vector<name_component>::const_iterator, - std::vector<name_component>::const_iterator> - find_name_components_bounds (const lookup_name_info &ln_no_params, - enum language lang) const; - - /* Prevent deleting/destroying via a base class pointer. */ -protected: - ~mapped_index_base() = default; -}; - -/* A description of the mapped index. The file format is described in - a comment by the code that writes the index. */ -struct mapped_index final : public mapped_index_base -{ - /* A slot/bucket in the symbol table hash. */ - struct symbol_table_slot - { - const offset_type name; - const offset_type vec; - }; - - /* Index data format version. */ - int version = 0; - - /* The address table data. */ - gdb::array_view<const gdb_byte> address_table; - - /* The symbol table, implemented as a hash table. */ - gdb::array_view<symbol_table_slot> symbol_table; - - /* A pointer to the constant pool. */ - const char *constant_pool = nullptr; - - bool symbol_name_slot_invalid (offset_type idx) const override - { - const auto &bucket = this->symbol_table[idx]; - return bucket.name == 0 && bucket.vec == 0; - } - - /* Convenience method to get at the name of the symbol at IDX in the - symbol table. */ - const char *symbol_name_at (offset_type idx) const override - { return this->constant_pool + MAYBE_SWAP (this->symbol_table[idx].name); } - - size_t symbol_name_count () const override - { return this->symbol_table.size (); } -}; - -/* A description of the mapped .debug_names. - Uninitialized map has CU_COUNT 0. */ -struct mapped_debug_names final : public mapped_index_base -{ - mapped_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile_) - : dwarf2_per_objfile (dwarf2_per_objfile_) - {} - - struct dwarf2_per_objfile *dwarf2_per_objfile; - bfd_endian dwarf5_byte_order; - bool dwarf5_is_dwarf64; - bool augmentation_is_gdb; - uint8_t offset_size; - uint32_t cu_count = 0; - uint32_t tu_count, bucket_count, name_count; - const gdb_byte *cu_table_reordered, *tu_table_reordered; - const uint32_t *bucket_table_reordered, *hash_table_reordered; - const gdb_byte *name_table_string_offs_reordered; - const gdb_byte *name_table_entry_offs_reordered; - const gdb_byte *entry_pool; - - struct index_val - { - ULONGEST dwarf_tag; - struct attr - { - /* Attribute name DW_IDX_*. */ - ULONGEST dw_idx; - - /* Attribute form DW_FORM_*. */ - ULONGEST form; - - /* Value if FORM is DW_FORM_implicit_const. */ - LONGEST implicit_const; - }; - std::vector<attr> attr_vec; - }; - - std::unordered_map<ULONGEST, index_val> abbrev_map; - - const char *namei_to_name (uint32_t namei) const; - - /* Implementation of the mapped_index_base virtual interface, for - the name_components cache. */ - - const char *symbol_name_at (offset_type idx) const override - { return namei_to_name (idx); } - - size_t symbol_name_count () const override - { return this->name_count; } -}; - -/* See dwarf2read.h. */ - -dwarf2_per_objfile * -get_dwarf2_per_objfile (struct objfile *objfile) -{ - return dwarf2_objfile_data_key.get (objfile); -} - -/* Default names of the debugging sections. */ - -/* Note that if the debugging section has been compressed, it might - have a name like .zdebug_info. */ - -static const struct dwarf2_debug_sections dwarf2_elf_names = -{ - { ".debug_info", ".zdebug_info" }, - { ".debug_abbrev", ".zdebug_abbrev" }, - { ".debug_line", ".zdebug_line" }, - { ".debug_loc", ".zdebug_loc" }, - { ".debug_loclists", ".zdebug_loclists" }, - { ".debug_macinfo", ".zdebug_macinfo" }, - { ".debug_macro", ".zdebug_macro" }, - { ".debug_str", ".zdebug_str" }, - { ".debug_str_offsets", ".zdebug_str_offsets" }, - { ".debug_line_str", ".zdebug_line_str" }, - { ".debug_ranges", ".zdebug_ranges" }, - { ".debug_rnglists", ".zdebug_rnglists" }, - { ".debug_types", ".zdebug_types" }, - { ".debug_addr", ".zdebug_addr" }, - { ".debug_frame", ".zdebug_frame" }, - { ".eh_frame", NULL }, - { ".gdb_index", ".zgdb_index" }, - { ".debug_names", ".zdebug_names" }, - { ".debug_aranges", ".zdebug_aranges" }, - 23 -}; - -/* List of DWO/DWP sections. */ - -static const struct dwop_section_names -{ - struct dwarf2_section_names abbrev_dwo; - struct dwarf2_section_names info_dwo; - struct dwarf2_section_names line_dwo; - struct dwarf2_section_names loc_dwo; - struct dwarf2_section_names loclists_dwo; - struct dwarf2_section_names macinfo_dwo; - struct dwarf2_section_names macro_dwo; - struct dwarf2_section_names str_dwo; - struct dwarf2_section_names str_offsets_dwo; - struct dwarf2_section_names types_dwo; - struct dwarf2_section_names cu_index; - struct dwarf2_section_names tu_index; -} -dwop_section_names = -{ - { ".debug_abbrev.dwo", ".zdebug_abbrev.dwo" }, - { ".debug_info.dwo", ".zdebug_info.dwo" }, - { ".debug_line.dwo", ".zdebug_line.dwo" }, - { ".debug_loc.dwo", ".zdebug_loc.dwo" }, - { ".debug_loclists.dwo", ".zdebug_loclists.dwo" }, - { ".debug_macinfo.dwo", ".zdebug_macinfo.dwo" }, - { ".debug_macro.dwo", ".zdebug_macro.dwo" }, - { ".debug_str.dwo", ".zdebug_str.dwo" }, - { ".debug_str_offsets.dwo", ".zdebug_str_offsets.dwo" }, - { ".debug_types.dwo", ".zdebug_types.dwo" }, - { ".debug_cu_index", ".zdebug_cu_index" }, - { ".debug_tu_index", ".zdebug_tu_index" }, -}; - -/* local data types */ - -/* The data in a compilation unit header, after target2host - translation, looks like this. */ -struct comp_unit_head -{ - unsigned int length; - short version; - unsigned char addr_size; - unsigned char signed_addr_p; - sect_offset abbrev_sect_off; - - /* Size of file offsets; either 4 or 8. */ - unsigned int offset_size; - - /* Size of the length field; either 4 or 12. */ - unsigned int initial_length_size; - - enum dwarf_unit_type unit_type; - - /* Offset to the first byte of this compilation unit header in the - .debug_info section, for resolving relative reference dies. */ - sect_offset sect_off; - - /* Offset to first die in this cu from the start of the cu. - This will be the first byte following the compilation unit header. */ - cu_offset first_die_cu_offset; - - - /* 64-bit signature of this unit. For type units, it denotes the signature of - the type (DW_UT_type in DWARF 4, additionally DW_UT_split_type in DWARF 5). - Also used in DWARF 5, to denote the dwo id when the unit type is - DW_UT_skeleton or DW_UT_split_compile. */ - ULONGEST signature; - - /* For types, offset in the type's DIE of the type defined by this TU. */ - cu_offset type_cu_offset_in_tu; -}; - -/* Type used for delaying computation of method physnames. - See comments for compute_delayed_physnames. */ -struct delayed_method_info -{ - /* The type to which the method is attached, i.e., its parent class. */ - struct type *type; - - /* The index of the method in the type's function fieldlists. */ - int fnfield_index; - - /* The index of the method in the fieldlist. */ - int index; - - /* The name of the DIE. */ - const char *name; - - /* The DIE associated with this method. */ - struct die_info *die; -}; - -/* Internal state when decoding a particular compilation unit. */ -struct dwarf2_cu -{ - explicit dwarf2_cu (struct dwarf2_per_cu_data *per_cu); - ~dwarf2_cu (); - - DISABLE_COPY_AND_ASSIGN (dwarf2_cu); - - /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope. - Create the set of symtabs used by this TU, or if this TU is sharing - symtabs with another TU and the symtabs have already been created - then restore those symtabs in the line header. - We don't need the pc/line-number mapping for type units. */ - void setup_type_unit_groups (struct die_info *die); - - /* Start a symtab for DWARF. NAME, COMP_DIR, LOW_PC are passed to the - buildsym_compunit constructor. */ - struct compunit_symtab *start_symtab (const char *name, - const char *comp_dir, - CORE_ADDR low_pc); - - /* Reset the builder. */ - void reset_builder () { m_builder.reset (); } - - /* The header of the compilation unit. */ - struct comp_unit_head header {}; - - /* Base address of this compilation unit. */ - CORE_ADDR base_address = 0; - - /* Non-zero if base_address has been set. */ - int base_known = 0; - - /* The language we are debugging. */ - enum language language = language_unknown; - const struct language_defn *language_defn = nullptr; - - const char *producer = nullptr; - -private: - /* The symtab builder for this CU. This is only non-NULL when full - symbols are being read. */ - std::unique_ptr<buildsym_compunit> m_builder; - -public: - /* The generic symbol table building routines have separate lists for - file scope symbols and all all other scopes (local scopes). So - we need to select the right one to pass to add_symbol_to_list(). - We do it by keeping a pointer to the correct list in list_in_scope. - - FIXME: The original dwarf code just treated the file scope as the - first local scope, and all other local scopes as nested local - scopes, and worked fine. Check to see if we really need to - distinguish these in buildsym.c. */ - struct pending **list_in_scope = nullptr; - - /* Hash table holding all the loaded partial DIEs - with partial_die->offset.SECT_OFF as hash. */ - htab_t partial_dies = nullptr; - - /* Storage for things with the same lifetime as this read-in compilation - unit, including partial DIEs. */ - auto_obstack comp_unit_obstack; - - /* When multiple dwarf2_cu structures are living in memory, this field - chains them all together, so that they can be released efficiently. - We will probably also want a generation counter so that most-recently-used - compilation units are cached... */ - struct dwarf2_per_cu_data *read_in_chain = nullptr; - - /* Backlink to our per_cu entry. */ - struct dwarf2_per_cu_data *per_cu; - - /* How many compilation units ago was this CU last referenced? */ - int last_used = 0; - - /* A hash table of DIE cu_offset for following references with - die_info->offset.sect_off as hash. */ - htab_t die_hash = nullptr; - - /* Full DIEs if read in. */ - struct die_info *dies = nullptr; - - /* A set of pointers to dwarf2_per_cu_data objects for compilation - units referenced by this one. Only set during full symbol processing; - partial symbol tables do not have dependencies. */ - htab_t dependencies = nullptr; - - /* Header data from the line table, during full symbol processing. */ - struct line_header *line_header = nullptr; - /* Non-NULL if LINE_HEADER is owned by this DWARF_CU. Otherwise, - it's owned by dwarf2_per_objfile::line_header_hash. If non-NULL, - this is the DW_TAG_compile_unit die for this CU. We'll hold on - to the line header as long as this DIE is being processed. See - process_die_scope. */ - die_info *line_header_die_owner = nullptr; - - /* A list of methods which need to have physnames computed - after all type information has been read. */ - std::vector<delayed_method_info> method_list; - - /* To be copied to symtab->call_site_htab. */ - htab_t call_site_htab = nullptr; - - /* Non-NULL if this CU came from a DWO file. - There is an invariant here that is important to remember: - Except for attributes copied from the top level DIE in the "main" - (or "stub") file in preparation for reading the DWO file - (e.g., DW_AT_addr_base), we KISS: there is only *one* CU. - Either there isn't a DWO file (in which case this is NULL and the point - is moot), or there is and either we're not going to read it (in which - case this is NULL) or there is and we are reading it (in which case this - is non-NULL). */ - struct dwo_unit *dwo_unit = nullptr; - - /* The DW_AT_addr_base (DW_AT_GNU_addr_base) attribute if present. - Note this value comes from the Fission stub CU/TU's DIE. */ - gdb::optional<ULONGEST> addr_base; - - /* The DW_AT_rnglists_base attribute if present. - Note this value comes from the Fission stub CU/TU's DIE. - Also note that the value is zero in the non-DWO case so this value can - be used without needing to know whether DWO files are in use or not. - N.B. This does not apply to DW_AT_ranges appearing in - DW_TAG_compile_unit dies. This is a bit of a wart, consider if ever - DW_AT_ranges appeared in the DW_TAG_compile_unit of DWO DIEs: then - DW_AT_rnglists_base *would* have to be applied, and we'd have to care - whether the DW_AT_ranges attribute came from the skeleton or DWO. */ - ULONGEST ranges_base = 0; - - /* When reading debug info generated by older versions of rustc, we - have to rewrite some union types to be struct types with a - variant part. This rewriting must be done after the CU is fully - read in, because otherwise at the point of rewriting some struct - type might not have been fully processed. So, we keep a list of - all such types here and process them after expansion. */ - std::vector<struct type *> rust_unions; - - /* The DW_AT_str_offsets_base attribute if present. For DWARF 4 version DWO - files, the value is implicitly zero. For DWARF 5 version DWO files, the - value is often implicit and is the size of the header of - .debug_str_offsets section (8 or 4, depending on the address size). */ - gdb::optional<ULONGEST> str_offsets_base; - - /* Mark used when releasing cached dies. */ - bool mark : 1; - - /* This CU references .debug_loc. See the symtab->locations_valid field. - This test is imperfect as there may exist optimized debug code not using - any location list and still facing inlining issues if handled as - unoptimized code. For a future better test see GCC PR other/32998. */ - bool has_loclist : 1; - - /* These cache the results for producer_is_* fields. CHECKED_PRODUCER is true - if all the producer_is_* fields are valid. This information is cached - because profiling CU expansion showed excessive time spent in - producer_is_gxx_lt_4_6. */ - bool checked_producer : 1; - bool producer_is_gxx_lt_4_6 : 1; - bool producer_is_gcc_lt_4_3 : 1; - bool producer_is_icc : 1; - bool producer_is_icc_lt_14 : 1; - bool producer_is_codewarrior : 1; - - /* When true, the file that we're processing is known to have - debugging info for C++ namespaces. GCC 3.3.x did not produce - this information, but later versions do. */ - - bool processing_has_namespace_info : 1; - - struct partial_die_info *find_partial_die (sect_offset sect_off); - - /* If this CU was inherited by another CU (via specification, - abstract_origin, etc), this is the ancestor CU. */ - dwarf2_cu *ancestor; - - /* Get the buildsym_compunit for this CU. */ - buildsym_compunit *get_builder () - { - /* If this CU has a builder associated with it, use that. */ - if (m_builder != nullptr) - return m_builder.get (); - - /* Otherwise, search ancestors for a valid builder. */ - if (ancestor != nullptr) - return ancestor->get_builder (); - - return nullptr; - } -}; - -/* A struct that can be used as a hash key for tables based on DW_AT_stmt_list. - This includes type_unit_group and quick_file_names. */ - -struct stmt_list_hash -{ - /* The DWO unit this table is from or NULL if there is none. */ - struct dwo_unit *dwo_unit; - - /* Offset in .debug_line or .debug_line.dwo. */ - sect_offset line_sect_off; -}; - -/* Each element of dwarf2_per_objfile->type_unit_groups is a pointer to - an object of this type. */ - -struct type_unit_group -{ - /* dwarf2read.c's main "handle" on a TU symtab. - To simplify things we create an artificial CU that "includes" all the - type units using this stmt_list so that the rest of the code still has - a "per_cu" handle on the symtab. - This PER_CU is recognized by having no section. */ -#define IS_TYPE_UNIT_GROUP(per_cu) ((per_cu)->section == NULL) - struct dwarf2_per_cu_data per_cu; - - /* The TUs that share this DW_AT_stmt_list entry. - This is added to while parsing type units to build partial symtabs, - and is deleted afterwards and not used again. */ - std::vector<signatured_type *> *tus; - - /* The compunit symtab. - Type units in a group needn't all be defined in the same source file, - so we create an essentially anonymous symtab as the compunit symtab. */ - struct compunit_symtab *compunit_symtab; - - /* The data used to construct the hash key. */ - struct stmt_list_hash hash; - - /* The number of symtabs from the line header. - The value here must match line_header.num_file_names. */ - unsigned int num_symtabs; - - /* The symbol tables for this TU (obtained from the files listed in - DW_AT_stmt_list). - WARNING: The order of entries here must match the order of entries - in the line header. After the first TU using this type_unit_group, the - line header for the subsequent TUs is recreated from this. This is done - because we need to use the same symtabs for each TU using the same - DW_AT_stmt_list value. Also note that symtabs may be repeated here, - there's no guarantee the line header doesn't have duplicate entries. */ - struct symtab **symtabs; -}; - -/* These sections are what may appear in a (real or virtual) DWO file. */ - -struct dwo_sections -{ - struct dwarf2_section_info abbrev; - struct dwarf2_section_info line; - struct dwarf2_section_info loc; - struct dwarf2_section_info loclists; - struct dwarf2_section_info macinfo; - struct dwarf2_section_info macro; - struct dwarf2_section_info str; - struct dwarf2_section_info str_offsets; - /* In the case of a virtual DWO file, these two are unused. */ - struct dwarf2_section_info info; - std::vector<dwarf2_section_info> types; -}; - -/* CUs/TUs in DWP/DWO files. */ - -struct dwo_unit -{ - /* Backlink to the containing struct dwo_file. */ - struct dwo_file *dwo_file; - - /* The "id" that distinguishes this CU/TU. - .debug_info calls this "dwo_id", .debug_types calls this "signature". - Since signatures came first, we stick with it for consistency. */ - ULONGEST signature; - - /* The section this CU/TU lives in, in the DWO file. */ - struct dwarf2_section_info *section; - - /* Same as dwarf2_per_cu_data:{sect_off,length} but in the DWO section. */ - sect_offset sect_off; - unsigned int length; - - /* For types, offset in the type's DIE of the type defined by this TU. */ - cu_offset type_offset_in_tu; -}; - -/* include/dwarf2.h defines the DWP section codes. - It defines a max value but it doesn't define a min value, which we - use for error checking, so provide one. */ - -enum dwp_v2_section_ids -{ - DW_SECT_MIN = 1 -}; - -/* Data for one DWO file. - - This includes virtual DWO files (a virtual DWO file is a DWO file as it - appears in a DWP file). DWP files don't really have DWO files per se - - comdat folding of types "loses" the DWO file they came from, and from - a high level view DWP files appear to contain a mass of random types. - However, to maintain consistency with the non-DWP case we pretend DWP - files contain virtual DWO files, and we assign each TU with one virtual - DWO file (generally based on the line and abbrev section offsets - - a heuristic that seems to work in practice). */ - -struct dwo_file -{ - dwo_file () = default; - DISABLE_COPY_AND_ASSIGN (dwo_file); - - /* The DW_AT_GNU_dwo_name or DW_AT_dwo_name attribute. - For virtual DWO files the name is constructed from the section offsets - of abbrev,line,loc,str_offsets so that we combine virtual DWO files - from related CU+TUs. */ - const char *dwo_name = nullptr; - - /* The DW_AT_comp_dir attribute. */ - const char *comp_dir = nullptr; - - /* The bfd, when the file is open. Otherwise this is NULL. - This is unused(NULL) for virtual DWO files where we use dwp_file.dbfd. */ - gdb_bfd_ref_ptr dbfd; - - /* The sections that make up this DWO file. - Remember that for virtual DWO files in DWP V2, these are virtual - sections (for lack of a better name). */ - struct dwo_sections sections {}; - - /* The CUs in the file. - Each element is a struct dwo_unit. Multiple CUs per DWO are supported as - an extension to handle LLVM's Link Time Optimization output (where - multiple source files may be compiled into a single object/dwo pair). */ - htab_t cus {}; - - /* Table of TUs in the file. - Each element is a struct dwo_unit. */ - htab_t tus {}; -}; - -/* These sections are what may appear in a DWP file. */ - -struct dwp_sections -{ - /* These are used by both DWP version 1 and 2. */ - struct dwarf2_section_info str; - struct dwarf2_section_info cu_index; - struct dwarf2_section_info tu_index; - - /* These are only used by DWP version 2 files. - In DWP version 1 the .debug_info.dwo, .debug_types.dwo, and other - sections are referenced by section number, and are not recorded here. - In DWP version 2 there is at most one copy of all these sections, each - section being (effectively) comprised of the concatenation of all of the - individual sections that exist in the version 1 format. - To keep the code simple we treat each of these concatenated pieces as a - section itself (a virtual section?). */ - struct dwarf2_section_info abbrev; - struct dwarf2_section_info info; - struct dwarf2_section_info line; - struct dwarf2_section_info loc; - struct dwarf2_section_info macinfo; - struct dwarf2_section_info macro; - struct dwarf2_section_info str_offsets; - struct dwarf2_section_info types; -}; - -/* These sections are what may appear in a virtual DWO file in DWP version 1. - A virtual DWO file is a DWO file as it appears in a DWP file. */ - -struct virtual_v1_dwo_sections -{ - struct dwarf2_section_info abbrev; - struct dwarf2_section_info line; - struct dwarf2_section_info loc; - struct dwarf2_section_info macinfo; - struct dwarf2_section_info macro; - struct dwarf2_section_info str_offsets; - /* Each DWP hash table entry records one CU or one TU. - That is recorded here, and copied to dwo_unit.section. */ - struct dwarf2_section_info info_or_types; -}; - -/* Similar to virtual_v1_dwo_sections, but for DWP version 2. - In version 2, the sections of the DWO files are concatenated together - and stored in one section of that name. Thus each ELF section contains - several "virtual" sections. */ - -struct virtual_v2_dwo_sections -{ - bfd_size_type abbrev_offset; - bfd_size_type abbrev_size; - - bfd_size_type line_offset; - bfd_size_type line_size; - - bfd_size_type loc_offset; - bfd_size_type loc_size; - - bfd_size_type macinfo_offset; - bfd_size_type macinfo_size; - - bfd_size_type macro_offset; - bfd_size_type macro_size; - - bfd_size_type str_offsets_offset; - bfd_size_type str_offsets_size; - - /* Each DWP hash table entry records one CU or one TU. - That is recorded here, and copied to dwo_unit.section. */ - bfd_size_type info_or_types_offset; - bfd_size_type info_or_types_size; -}; - -/* Contents of DWP hash tables. */ - -struct dwp_hash_table -{ - uint32_t version, nr_columns; - uint32_t nr_units, nr_slots; - const gdb_byte *hash_table, *unit_table; - union - { - struct - { - const gdb_byte *indices; - } v1; - struct - { - /* This is indexed by column number and gives the id of the section - in that column. */ -#define MAX_NR_V2_DWO_SECTIONS \ - (1 /* .debug_info or .debug_types */ \ - + 1 /* .debug_abbrev */ \ - + 1 /* .debug_line */ \ - + 1 /* .debug_loc */ \ - + 1 /* .debug_str_offsets */ \ - + 1 /* .debug_macro or .debug_macinfo */) - int section_ids[MAX_NR_V2_DWO_SECTIONS]; - const gdb_byte *offsets; - const gdb_byte *sizes; - } v2; - } section_pool; -}; - -/* Data for one DWP file. */ - -struct dwp_file -{ - dwp_file (const char *name_, gdb_bfd_ref_ptr &&abfd) - : name (name_), - dbfd (std::move (abfd)) - { - } - - /* Name of the file. */ - const char *name; - - /* File format version. */ - int version = 0; - - /* The bfd. */ - gdb_bfd_ref_ptr dbfd; - - /* Section info for this file. */ - struct dwp_sections sections {}; - - /* Table of CUs in the file. */ - const struct dwp_hash_table *cus = nullptr; - - /* Table of TUs in the file. */ - const struct dwp_hash_table *tus = nullptr; - - /* Tables of loaded CUs/TUs. Each entry is a struct dwo_unit *. */ - htab_t loaded_cus {}; - htab_t loaded_tus {}; - - /* Table to map ELF section numbers to their sections. - This is only needed for the DWP V1 file format. */ - unsigned int num_sections = 0; - asection **elf_sections = nullptr; -}; - -/* Struct used to pass misc. parameters to read_die_and_children, et - al. which are used for both .debug_info and .debug_types dies. - All parameters here are unchanging for the life of the call. This - struct exists to abstract away the constant parameters of die reading. */ - -struct die_reader_specs -{ - /* The bfd of die_section. */ - bfd* abfd; - - /* The CU of the DIE we are parsing. */ - struct dwarf2_cu *cu; - - /* Non-NULL if reading a DWO file (including one packaged into a DWP). */ - struct dwo_file *dwo_file; - - /* The section the die comes from. - This is either .debug_info or .debug_types, or the .dwo variants. */ - struct dwarf2_section_info *die_section; - - /* die_section->buffer. */ - const gdb_byte *buffer; - - /* The end of the buffer. */ - const gdb_byte *buffer_end; - - /* The abbreviation table to use when reading the DIEs. */ - struct abbrev_table *abbrev_table; -}; - -/* A subclass of die_reader_specs that holds storage and has complex - constructor and destructor behavior. */ - -class cutu_reader : public die_reader_specs -{ -public: - - cutu_reader (struct dwarf2_per_cu_data *this_cu, - struct abbrev_table *abbrev_table, - int use_existing_cu, int keep, - bool skip_partial); - - explicit cutu_reader (struct dwarf2_per_cu_data *this_cu, - struct dwarf2_cu *parent_cu = nullptr, - struct dwo_file *dwo_file = nullptr); - - ~cutu_reader (); - - DISABLE_COPY_AND_ASSIGN (cutu_reader); - - const gdb_byte *info_ptr = nullptr; - struct die_info *comp_unit_die = nullptr; - int has_children = 0; - bool dummy_p = false; - -private: - void init_tu_and_read_dwo_dies (struct dwarf2_per_cu_data *this_cu, - int use_existing_cu, int keep); - - struct dwarf2_per_cu_data *m_this_cu; - int m_keep = 0; - std::unique_ptr<dwarf2_cu> m_new_cu; - - /* The ordinary abbreviation table. */ - abbrev_table_up m_abbrev_table_holder; - - /* The DWO abbreviation table. */ - abbrev_table_up m_dwo_abbrev_table; -}; - -/* dir_index is 1-based in DWARF 4 and before, and is 0-based in DWARF 5 and - later. */ -typedef int dir_index; - -/* file_name_index is 1-based in DWARF 4 and before, and is 0-based in DWARF 5 - and later. */ -typedef int file_name_index; - -struct file_entry -{ - file_entry () = default; - - file_entry (const char *name_, dir_index d_index_, - unsigned int mod_time_, unsigned int length_) - : name (name_), - d_index (d_index_), - mod_time (mod_time_), - length (length_) - {} - - /* Return the include directory at D_INDEX stored in LH. Returns - NULL if D_INDEX is out of bounds. */ - const char *include_dir (const line_header *lh) const; - - /* The file name. Note this is an observing pointer. The memory is - owned by debug_line_buffer. */ - const char *name {}; - - /* The directory index (1-based). */ - dir_index d_index {}; - - unsigned int mod_time {}; - - unsigned int length {}; - - /* True if referenced by the Line Number Program. */ - bool included_p {}; - - /* The associated symbol table, if any. */ - struct symtab *symtab {}; -}; - -/* The line number information for a compilation unit (found in the - .debug_line section) begins with a "statement program header", - which contains the following information. */ -struct line_header -{ - line_header () - : offset_in_dwz {} - {} - - /* Add an entry to the include directory table. */ - void add_include_dir (const char *include_dir); - - /* Add an entry to the file name table. */ - void add_file_name (const char *name, dir_index d_index, - unsigned int mod_time, unsigned int length); - - /* Return the include dir at INDEX (0-based in DWARF 5 and 1-based before). - Returns NULL if INDEX is out of bounds. */ - const char *include_dir_at (dir_index index) const - { - int vec_index; - if (version >= 5) - vec_index = index; - else - vec_index = index - 1; - if (vec_index < 0 || vec_index >= m_include_dirs.size ()) - return NULL; - return m_include_dirs[vec_index]; - } - - bool is_valid_file_index (int file_index) - { - if (version >= 5) - return 0 <= file_index && file_index < file_names_size (); - return 1 <= file_index && file_index <= file_names_size (); - } - - /* Return the file name at INDEX (0-based in DWARF 5 and 1-based before). - Returns NULL if INDEX is out of bounds. */ - file_entry *file_name_at (file_name_index index) - { - int vec_index; - if (version >= 5) - vec_index = index; - else - vec_index = index - 1; - if (vec_index < 0 || vec_index >= m_file_names.size ()) - return NULL; - return &m_file_names[vec_index]; - } - - /* The indexes are 0-based in DWARF 5 and 1-based in DWARF 4. Therefore, - this method should only be used to iterate through all file entries in an - index-agnostic manner. */ - std::vector<file_entry> &file_names () - { return m_file_names; } - - /* Offset of line number information in .debug_line section. */ - sect_offset sect_off {}; - - /* OFFSET is for struct dwz_file associated with dwarf2_per_objfile. */ - unsigned offset_in_dwz : 1; /* Can't initialize bitfields in-class. */ - - unsigned int total_length {}; - unsigned short version {}; - unsigned int header_length {}; - unsigned char minimum_instruction_length {}; - unsigned char maximum_ops_per_instruction {}; - unsigned char default_is_stmt {}; - int line_base {}; - unsigned char line_range {}; - unsigned char opcode_base {}; - - /* standard_opcode_lengths[i] is the number of operands for the - standard opcode whose value is i. This means that - standard_opcode_lengths[0] is unused, and the last meaningful - element is standard_opcode_lengths[opcode_base - 1]. */ - std::unique_ptr<unsigned char[]> standard_opcode_lengths; - - int file_names_size () - { return m_file_names.size(); } - - /* The start and end of the statement program following this - header. These point into dwarf2_per_objfile->line_buffer. */ - const gdb_byte *statement_program_start {}, *statement_program_end {}; - - private: - /* The include_directories table. Note these are observing - pointers. The memory is owned by debug_line_buffer. */ - std::vector<const char *> m_include_dirs; - - /* The file_names table. This is private because the meaning of indexes - differs among DWARF versions (The first valid index is 1 in DWARF 4 and - before, and is 0 in DWARF 5 and later). So the client should use - file_name_at method for access. */ - std::vector<file_entry> m_file_names; -}; - -typedef std::unique_ptr<line_header> line_header_up; - -const char * -file_entry::include_dir (const line_header *lh) const -{ - return lh->include_dir_at (d_index); -} - -/* When we construct a partial symbol table entry we only - need this much information. */ -struct partial_die_info : public allocate_on_obstack - { - partial_die_info (sect_offset sect_off, struct abbrev_info *abbrev); - - /* Disable assign but still keep copy ctor, which is needed - load_partial_dies. */ - partial_die_info& operator=(const partial_die_info& rhs) = delete; - - /* Adjust the partial die before generating a symbol for it. This - function may set the is_external flag or change the DIE's - name. */ - void fixup (struct dwarf2_cu *cu); - - /* Read a minimal amount of information into the minimal die - structure. */ - const gdb_byte *read (const struct die_reader_specs *reader, - const struct abbrev_info &abbrev, - const gdb_byte *info_ptr); - - /* Offset of this DIE. */ - const sect_offset sect_off; - - /* DWARF-2 tag for this DIE. */ - const ENUM_BITFIELD(dwarf_tag) tag : 16; - - /* Assorted flags describing the data found in this DIE. */ - const unsigned int has_children : 1; - - unsigned int is_external : 1; - unsigned int is_declaration : 1; - unsigned int has_type : 1; - unsigned int has_specification : 1; - unsigned int has_pc_info : 1; - unsigned int may_be_inlined : 1; - - /* This DIE has been marked DW_AT_main_subprogram. */ - unsigned int main_subprogram : 1; - - /* Flag set if the SCOPE field of this structure has been - computed. */ - unsigned int scope_set : 1; - - /* Flag set if the DIE has a byte_size attribute. */ - unsigned int has_byte_size : 1; - - /* Flag set if the DIE has a DW_AT_const_value attribute. */ - unsigned int has_const_value : 1; - - /* Flag set if any of the DIE's children are template arguments. */ - unsigned int has_template_arguments : 1; - - /* Flag set if fixup has been called on this die. */ - unsigned int fixup_called : 1; - - /* Flag set if DW_TAG_imported_unit uses DW_FORM_GNU_ref_alt. */ - unsigned int is_dwz : 1; - - /* Flag set if spec_offset uses DW_FORM_GNU_ref_alt. */ - unsigned int spec_is_dwz : 1; - - /* The name of this DIE. Normally the value of DW_AT_name, but - sometimes a default name for unnamed DIEs. */ - const char *name = nullptr; - - /* The linkage name, if present. */ - const char *linkage_name = nullptr; - - /* The scope to prepend to our children. This is generally - allocated on the comp_unit_obstack, so will disappear - when this compilation unit leaves the cache. */ - const char *scope = nullptr; - - /* Some data associated with the partial DIE. The tag determines - which field is live. */ - union - { - /* The location description associated with this DIE, if any. */ - struct dwarf_block *locdesc; - /* The offset of an import, for DW_TAG_imported_unit. */ - sect_offset sect_off; - } d {}; - - /* If HAS_PC_INFO, the PC range associated with this DIE. */ - CORE_ADDR lowpc = 0; - CORE_ADDR highpc = 0; - - /* Pointer into the info_buffer (or types_buffer) pointing at the target of - DW_AT_sibling, if any. */ - /* NOTE: This member isn't strictly necessary, partial_die_info::read - could return DW_AT_sibling values to its caller load_partial_dies. */ - const gdb_byte *sibling = nullptr; - - /* If HAS_SPECIFICATION, the offset of the DIE referred to by - DW_AT_specification (or DW_AT_abstract_origin or - DW_AT_extension). */ - sect_offset spec_offset {}; - - /* Pointers to this DIE's parent, first child, and next sibling, - if any. */ - struct partial_die_info *die_parent = nullptr; - struct partial_die_info *die_child = nullptr; - struct partial_die_info *die_sibling = nullptr; - - friend struct partial_die_info * - dwarf2_cu::find_partial_die (sect_offset sect_off); - - private: - /* Only need to do look up in dwarf2_cu::find_partial_die. */ - partial_die_info (sect_offset sect_off) - : partial_die_info (sect_off, DW_TAG_padding, 0) - { - } - - partial_die_info (sect_offset sect_off_, enum dwarf_tag tag_, - int has_children_) - : sect_off (sect_off_), tag (tag_), has_children (has_children_) - { - is_external = 0; - is_declaration = 0; - has_type = 0; - has_specification = 0; - has_pc_info = 0; - may_be_inlined = 0; - main_subprogram = 0; - scope_set = 0; - has_byte_size = 0; - has_const_value = 0; - has_template_arguments = 0; - fixup_called = 0; - is_dwz = 0; - spec_is_dwz = 0; - } - }; - -/* This data structure holds a complete die structure. */ -struct die_info - { - /* DWARF-2 tag for this DIE. */ - ENUM_BITFIELD(dwarf_tag) tag : 16; - - /* Number of attributes */ - unsigned char num_attrs; - - /* True if we're presently building the full type name for the - type derived from this DIE. */ - unsigned char building_fullname : 1; - - /* True if this die is in process. PR 16581. */ - unsigned char in_process : 1; - - /* Abbrev number */ - unsigned int abbrev; - - /* Offset in .debug_info or .debug_types section. */ - sect_offset sect_off; - - /* The dies in a compilation unit form an n-ary tree. PARENT - points to this die's parent; CHILD points to the first child of - this node; and all the children of a given node are chained - together via their SIBLING fields. */ - struct die_info *child; /* Its first child, if any. */ - struct die_info *sibling; /* Its next sibling, if any. */ - struct die_info *parent; /* Its parent, if any. */ - - /* An array of attributes, with NUM_ATTRS elements. There may be - zero, but it's not common and zero-sized arrays are not - sufficiently portable C. */ - struct attribute attrs[1]; - }; - -/* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte, - but this would require a corresponding change in unpack_field_as_long - and friends. */ -static int bits_per_byte = 8; - -/* When reading a variant or variant part, we track a bit more - information about the field, and store it in an object of this - type. */ - -struct variant_field -{ - /* If we see a DW_TAG_variant, then this will be the discriminant - value. */ - ULONGEST discriminant_value; - /* If we see a DW_TAG_variant, then this will be set if this is the - default branch. */ - bool default_branch; - /* While reading a DW_TAG_variant_part, this will be set if this - field is the discriminant. */ - bool is_discriminant; -}; - -struct nextfield -{ - int accessibility = 0; - int virtuality = 0; - /* Extra information to describe a variant or variant part. */ - struct variant_field variant {}; - struct field field {}; -}; - -struct fnfieldlist -{ - const char *name = nullptr; - std::vector<struct fn_field> fnfields; -}; - -/* The routines that read and process dies for a C struct or C++ class - pass lists of data member fields and lists of member function fields - in an instance of a field_info structure, as defined below. */ -struct field_info - { - /* List of data member and baseclasses fields. */ - std::vector<struct nextfield> fields; - std::vector<struct nextfield> baseclasses; - - /* Number of fields (including baseclasses). */ - int nfields = 0; - - /* Set if the accessibility of one of the fields is not public. */ - int non_public_fields = 0; - - /* Member function fieldlist array, contains name of possibly overloaded - member function, number of overloaded member functions and a pointer - to the head of the member function field chain. */ - std::vector<struct fnfieldlist> fnfieldlists; - - /* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of - a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */ - std::vector<struct decl_field> typedef_field_list; - - /* Nested types defined by this class and the number of elements in this - list. */ - std::vector<struct decl_field> nested_types_list; - }; - -/* One item on the queue of compilation units to read in full symbols - for. */ -struct dwarf2_queue_item -{ - struct dwarf2_per_cu_data *per_cu; - enum language pretend_language; - struct dwarf2_queue_item *next; -}; - -/* The current queue. */ -static struct dwarf2_queue_item *dwarf2_queue, *dwarf2_queue_tail; - -/* Loaded secondary compilation units are kept in memory until they - have not been referenced for the processing of this many - compilation units. Set this to zero to disable caching. Cache - sizes of up to at least twenty will improve startup time for - typical inter-CU-reference binaries, at an obvious memory cost. */ -static int dwarf_max_cache_age = 5; -static void -show_dwarf_max_cache_age (struct ui_file *file, int from_tty, - struct cmd_list_element *c, const char *value) -{ - fprintf_filtered (file, _("The upper bound on the age of cached " - "DWARF compilation units is %s.\n"), - value); -} - -/* local function prototypes */ - -static void dwarf2_find_base_address (struct die_info *die, - struct dwarf2_cu *cu); - -static dwarf2_psymtab *create_partial_symtab - (struct dwarf2_per_cu_data *per_cu, const char *name); - -static void build_type_psymtabs_reader (const struct die_reader_specs *reader, - const gdb_byte *info_ptr, - struct die_info *type_unit_die, - int has_children); - -static void dwarf2_build_psymtabs_hard - (struct dwarf2_per_objfile *dwarf2_per_objfile); - -static void scan_partial_symbols (struct partial_die_info *, - CORE_ADDR *, CORE_ADDR *, - int, struct dwarf2_cu *); - -static void add_partial_symbol (struct partial_die_info *, - struct dwarf2_cu *); - -static void add_partial_namespace (struct partial_die_info *pdi, - CORE_ADDR *lowpc, CORE_ADDR *highpc, - int set_addrmap, struct dwarf2_cu *cu); - -static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc, - CORE_ADDR *highpc, int set_addrmap, - struct dwarf2_cu *cu); - -static void add_partial_enumeration (struct partial_die_info *enum_pdi, - struct dwarf2_cu *cu); - -static void add_partial_subprogram (struct partial_die_info *pdi, - CORE_ADDR *lowpc, CORE_ADDR *highpc, - int need_pc, struct dwarf2_cu *cu); - -static unsigned int peek_abbrev_code (bfd *, const gdb_byte *); - -static struct partial_die_info *load_partial_dies - (const struct die_reader_specs *, const gdb_byte *, int); - -/* A pair of partial_die_info and compilation unit. */ -struct cu_partial_die_info -{ - /* The compilation unit of the partial_die_info. */ - struct dwarf2_cu *cu; - /* A partial_die_info. */ - struct partial_die_info *pdi; - - cu_partial_die_info (struct dwarf2_cu *cu, struct partial_die_info *pdi) - : cu (cu), - pdi (pdi) - { /* Nothing. */ } - -private: - cu_partial_die_info () = delete; -}; - -static const struct cu_partial_die_info find_partial_die (sect_offset, int, - struct dwarf2_cu *); - -static const gdb_byte *read_attribute (const struct die_reader_specs *, - struct attribute *, struct attr_abbrev *, - const gdb_byte *, bool *need_reprocess); - -static void read_attribute_reprocess (const struct die_reader_specs *reader, - struct attribute *attr); - -static CORE_ADDR read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index); - -static CORE_ADDR read_address (bfd *, const gdb_byte *ptr, struct dwarf2_cu *, - unsigned int *); - -static LONGEST read_initial_length (bfd *, const gdb_byte *, unsigned int *); - -static LONGEST read_checked_initial_length_and_offset - (bfd *, const gdb_byte *, const struct comp_unit_head *, - unsigned int *, unsigned int *); - -static LONGEST read_offset (bfd *, const gdb_byte *, - const struct comp_unit_head *, - unsigned int *); - -static LONGEST read_offset_1 (bfd *, const gdb_byte *, unsigned int); - -static sect_offset read_abbrev_offset - (struct dwarf2_per_objfile *dwarf2_per_objfile, - struct dwarf2_section_info *, sect_offset); - -static const gdb_byte *read_n_bytes (bfd *, const gdb_byte *, unsigned int); - -static const char *read_direct_string (bfd *, const gdb_byte *, unsigned int *); - -static const char *read_indirect_string - (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *, const gdb_byte *, - const struct comp_unit_head *, unsigned int *); - -static const char *read_indirect_line_string - (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *, const gdb_byte *, - const struct comp_unit_head *, unsigned int *); - -static const char *read_indirect_string_at_offset - (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *abfd, - LONGEST str_offset); - -static const char *read_indirect_string_from_dwz - (struct objfile *objfile, struct dwz_file *, LONGEST); - -static CORE_ADDR read_addr_index_from_leb128 (struct dwarf2_cu *, - const gdb_byte *, - unsigned int *); - -static const char *read_dwo_str_index (const struct die_reader_specs *reader, - ULONGEST str_index); - -static const char *read_stub_str_index (struct dwarf2_cu *cu, - ULONGEST str_index); - -static void set_cu_language (unsigned int, struct dwarf2_cu *); - -static struct attribute *dwarf2_attr (struct die_info *, unsigned int, - struct dwarf2_cu *); - -static struct attribute *dwarf2_attr_no_follow (struct die_info *, - unsigned int); - -static const char *dwarf2_string_attr (struct die_info *die, unsigned int name, - struct dwarf2_cu *cu); - -static const char *dwarf2_dwo_name (struct die_info *die, struct dwarf2_cu *cu); - -static int dwarf2_flag_true_p (struct die_info *die, unsigned name, - struct dwarf2_cu *cu); - -static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu); - -static struct die_info *die_specification (struct die_info *die, - struct dwarf2_cu **); - -static line_header_up dwarf_decode_line_header (sect_offset sect_off, - struct dwarf2_cu *cu); - -static void dwarf_decode_lines (struct line_header *, const char *, - struct dwarf2_cu *, dwarf2_psymtab *, - CORE_ADDR, int decode_mapping); - -static void dwarf2_start_subfile (struct dwarf2_cu *, const char *, - const char *); - -static struct symbol *new_symbol (struct die_info *, struct type *, - struct dwarf2_cu *, struct symbol * = NULL); - -static void dwarf2_const_value (const struct attribute *, struct symbol *, - struct dwarf2_cu *); - -static void dwarf2_const_value_attr (const struct attribute *attr, - struct type *type, - const char *name, - struct obstack *obstack, - struct dwarf2_cu *cu, LONGEST *value, - const gdb_byte **bytes, - struct dwarf2_locexpr_baton **baton); - -static struct type *die_type (struct die_info *, struct dwarf2_cu *); - -static int need_gnat_info (struct dwarf2_cu *); - -static struct type *die_descriptive_type (struct die_info *, - struct dwarf2_cu *); - -static void set_descriptive_type (struct type *, struct die_info *, - struct dwarf2_cu *); - -static struct type *die_containing_type (struct die_info *, - struct dwarf2_cu *); - -static struct type *lookup_die_type (struct die_info *, const struct attribute *, - struct dwarf2_cu *); - -static struct type *read_type_die (struct die_info *, struct dwarf2_cu *); - -static struct type *read_type_die_1 (struct die_info *, struct dwarf2_cu *); - -static const char *determine_prefix (struct die_info *die, struct dwarf2_cu *); - -static char *typename_concat (struct obstack *obs, const char *prefix, - const char *suffix, int physname, - struct dwarf2_cu *cu); - -static void read_file_scope (struct die_info *, struct dwarf2_cu *); - -static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *); - -static void read_func_scope (struct die_info *, struct dwarf2_cu *); - -static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *); - -static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu); - -static void read_variable (struct die_info *die, struct dwarf2_cu *cu); - -static int dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *, - struct dwarf2_cu *, dwarf2_psymtab *); - -/* How dwarf2_get_pc_bounds constructed its *LOWPC and *HIGHPC return - values. Keep the items ordered with increasing constraints compliance. */ -enum pc_bounds_kind -{ - /* No attribute DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges was found. */ - PC_BOUNDS_NOT_PRESENT, - - /* Some of the attributes DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges - were present but they do not form a valid range of PC addresses. */ - PC_BOUNDS_INVALID, - - /* Discontiguous range was found - that is DW_AT_ranges was found. */ - PC_BOUNDS_RANGES, - - /* Contiguous range was found - DW_AT_low_pc and DW_AT_high_pc were found. */ - PC_BOUNDS_HIGH_LOW, -}; - -static enum pc_bounds_kind dwarf2_get_pc_bounds (struct die_info *, - CORE_ADDR *, CORE_ADDR *, - struct dwarf2_cu *, - dwarf2_psymtab *); - -static void get_scope_pc_bounds (struct die_info *, - CORE_ADDR *, CORE_ADDR *, - struct dwarf2_cu *); - -static void dwarf2_record_block_ranges (struct die_info *, struct block *, - CORE_ADDR, struct dwarf2_cu *); - -static void dwarf2_add_field (struct field_info *, struct die_info *, - struct dwarf2_cu *); - -static void dwarf2_attach_fields_to_type (struct field_info *, - struct type *, struct dwarf2_cu *); - -static void dwarf2_add_member_fn (struct field_info *, - struct die_info *, struct type *, - struct dwarf2_cu *); - -static void dwarf2_attach_fn_fields_to_type (struct field_info *, - struct type *, - struct dwarf2_cu *); - -static void process_structure_scope (struct die_info *, struct dwarf2_cu *); - -static void read_common_block (struct die_info *, struct dwarf2_cu *); - -static void read_namespace (struct die_info *die, struct dwarf2_cu *); - -static void read_module (struct die_info *die, struct dwarf2_cu *cu); - -static struct using_direct **using_directives (struct dwarf2_cu *cu); - -static void read_import_statement (struct die_info *die, struct dwarf2_cu *); - -static int read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu); - -static struct type *read_module_type (struct die_info *die, - struct dwarf2_cu *cu); - -static const char *namespace_name (struct die_info *die, - int *is_anonymous, struct dwarf2_cu *); - -static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *); - -static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *); - -static enum dwarf_array_dim_ordering read_array_order (struct die_info *, - struct dwarf2_cu *); - -static struct die_info *read_die_and_siblings_1 - (const struct die_reader_specs *, const gdb_byte *, const gdb_byte **, - struct die_info *); - -static struct die_info *read_die_and_siblings (const struct die_reader_specs *, - const gdb_byte *info_ptr, - const gdb_byte **new_info_ptr, - struct die_info *parent); - -static const gdb_byte *read_full_die_1 (const struct die_reader_specs *, - struct die_info **, const gdb_byte *, - int *, int); - -static const gdb_byte *read_full_die (const struct die_reader_specs *, - struct die_info **, const gdb_byte *, - int *); - -static void process_die (struct die_info *, struct dwarf2_cu *); - -static const char *dwarf2_canonicalize_name (const char *, struct dwarf2_cu *, - struct obstack *); - -static const char *dwarf2_name (struct die_info *die, struct dwarf2_cu *); - -static const char *dwarf2_full_name (const char *name, - struct die_info *die, - struct dwarf2_cu *cu); - -static const char *dwarf2_physname (const char *name, struct die_info *die, - struct dwarf2_cu *cu); - -static struct die_info *dwarf2_extension (struct die_info *die, - struct dwarf2_cu **); - -static const char *dwarf_tag_name (unsigned int); - -static const char *dwarf_attr_name (unsigned int); - -static const char *dwarf_unit_type_name (int unit_type); - -static const char *dwarf_form_name (unsigned int); - -static const char *dwarf_bool_name (unsigned int); - -static const char *dwarf_type_encoding_name (unsigned int); - -static struct die_info *sibling_die (struct die_info *); - -static void dump_die_shallow (struct ui_file *, int indent, struct die_info *); - -static void dump_die_for_error (struct die_info *); - -static void dump_die_1 (struct ui_file *, int level, int max_level, - struct die_info *); - -/*static*/ void dump_die (struct die_info *, int max_level); - -static void store_in_ref_table (struct die_info *, - struct dwarf2_cu *); - -static sect_offset dwarf2_get_ref_die_offset (const struct attribute *); - -static LONGEST dwarf2_get_attr_constant_value (const struct attribute *, int); - -static struct die_info *follow_die_ref_or_sig (struct die_info *, - const struct attribute *, - struct dwarf2_cu **); - -static struct die_info *follow_die_ref (struct die_info *, - const struct attribute *, - struct dwarf2_cu **); - -static struct die_info *follow_die_sig (struct die_info *, - const struct attribute *, - struct dwarf2_cu **); - -static struct type *get_signatured_type (struct die_info *, ULONGEST, - struct dwarf2_cu *); - -static struct type *get_DW_AT_signature_type (struct die_info *, - const struct attribute *, - struct dwarf2_cu *); - -static void load_full_type_unit (struct dwarf2_per_cu_data *per_cu); - -static void read_signatured_type (struct signatured_type *); - -static int attr_to_dynamic_prop (const struct attribute *attr, - struct die_info *die, struct dwarf2_cu *cu, - struct dynamic_prop *prop, struct type *type); - -/* memory allocation interface */ - -static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *); - -static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int); - -static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int, int); - -static void fill_in_loclist_baton (struct dwarf2_cu *cu, - struct dwarf2_loclist_baton *baton, - const struct attribute *attr); - -static void dwarf2_symbol_mark_computed (const struct attribute *attr, - struct symbol *sym, - struct dwarf2_cu *cu, - int is_block); - -static const gdb_byte *skip_one_die (const struct die_reader_specs *reader, - const gdb_byte *info_ptr, - struct abbrev_info *abbrev); - -static hashval_t partial_die_hash (const void *item); - -static int partial_die_eq (const void *item_lhs, const void *item_rhs); - -static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit - (sect_offset sect_off, unsigned int offset_in_dwz, - struct dwarf2_per_objfile *dwarf2_per_objfile); - -static void prepare_one_comp_unit (struct dwarf2_cu *cu, - struct die_info *comp_unit_die, - enum language pretend_language); - -static void age_cached_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile); - -static void free_one_cached_comp_unit (struct dwarf2_per_cu_data *); - -static struct type *set_die_type (struct die_info *, struct type *, - struct dwarf2_cu *); - -static void create_all_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile); - -static int create_all_type_units (struct dwarf2_per_objfile *dwarf2_per_objfile); - -static void load_full_comp_unit (struct dwarf2_per_cu_data *, bool, - enum language); - -static void process_full_comp_unit (struct dwarf2_per_cu_data *, - enum language); - -static void process_full_type_unit (struct dwarf2_per_cu_data *, - enum language); - -static void dwarf2_add_dependence (struct dwarf2_cu *, - struct dwarf2_per_cu_data *); - -static void dwarf2_mark (struct dwarf2_cu *); - -static void dwarf2_clear_marks (struct dwarf2_per_cu_data *); - -static struct type *get_die_type_at_offset (sect_offset, - struct dwarf2_per_cu_data *); - -static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu); - -static void queue_comp_unit (struct dwarf2_per_cu_data *per_cu, - enum language pretend_language); - -static void process_queue (struct dwarf2_per_objfile *dwarf2_per_objfile); - -static struct type *dwarf2_per_cu_addr_type (struct dwarf2_per_cu_data *per_cu); -static struct type *dwarf2_per_cu_addr_sized_int_type - (struct dwarf2_per_cu_data *per_cu, bool unsigned_p); -static struct type *dwarf2_per_cu_int_type - (struct dwarf2_per_cu_data *per_cu, int size_in_bytes, - bool unsigned_p); - -/* Class, the destructor of which frees all allocated queue entries. This - will only have work to do if an error was thrown while processing the - dwarf. If no error was thrown then the queue entries should have all - been processed, and freed, as we went along. */ - -class dwarf2_queue_guard -{ -public: - dwarf2_queue_guard () = default; - - /* Free any entries remaining on the queue. There should only be - entries left if we hit an error while processing the dwarf. */ - ~dwarf2_queue_guard () - { - struct dwarf2_queue_item *item, *last; - - item = dwarf2_queue; - while (item) - { - /* Anything still marked queued is likely to be in an - inconsistent state, so discard it. */ - if (item->per_cu->queued) - { - if (item->per_cu->cu != NULL) - free_one_cached_comp_unit (item->per_cu); - item->per_cu->queued = 0; - } - - last = item; - item = item->next; - xfree (last); - } - - dwarf2_queue = dwarf2_queue_tail = NULL; - } -}; - -/* The return type of find_file_and_directory. Note, the enclosed - string pointers are only valid while this object is valid. */ - -struct file_and_directory -{ - /* The filename. This is never NULL. */ - const char *name; - - /* The compilation directory. NULL if not known. If we needed to - compute a new string, this points to COMP_DIR_STORAGE, otherwise, - points directly to the DW_AT_comp_dir string attribute owned by - the obstack that owns the DIE. */ - const char *comp_dir; - - /* If we needed to build a new string for comp_dir, this is what - owns the storage. */ - std::string comp_dir_storage; -}; - -static file_and_directory find_file_and_directory (struct die_info *die, - struct dwarf2_cu *cu); - -static char *file_full_name (int file, struct line_header *lh, - const char *comp_dir); - -/* Expected enum dwarf_unit_type for read_comp_unit_head. */ -enum class rcuh_kind { COMPILE, TYPE }; - -static const gdb_byte *read_and_check_comp_unit_head - (struct dwarf2_per_objfile* dwarf2_per_objfile, - struct comp_unit_head *header, - struct dwarf2_section_info *section, - struct dwarf2_section_info *abbrev_section, const gdb_byte *info_ptr, - rcuh_kind section_kind); - -static htab_t allocate_signatured_type_table (struct objfile *objfile); - -static htab_t allocate_dwo_unit_table (struct objfile *objfile); - -static struct dwo_unit *lookup_dwo_unit_in_dwp - (struct dwarf2_per_objfile *dwarf2_per_objfile, - struct dwp_file *dwp_file, const char *comp_dir, - ULONGEST signature, int is_debug_types); - -static struct dwp_file *get_dwp_file - (struct dwarf2_per_objfile *dwarf2_per_objfile); - -static struct dwo_unit *lookup_dwo_comp_unit - (struct dwarf2_per_cu_data *, const char *, const char *, ULONGEST); - -static struct dwo_unit *lookup_dwo_type_unit - (struct signatured_type *, const char *, const char *); - -static void queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *); - -/* A unique pointer to a dwo_file. */ - -typedef std::unique_ptr<struct dwo_file> dwo_file_up; - -static void process_cu_includes (struct dwarf2_per_objfile *dwarf2_per_objfile); - -static void check_producer (struct dwarf2_cu *cu); - -static void free_line_header_voidp (void *arg); - -/* Various complaints about symbol reading that don't abort the process. */ - -static void -dwarf2_statement_list_fits_in_line_number_section_complaint (void) -{ - complaint (_("statement list doesn't fit in .debug_line section")); -} - -static void -dwarf2_debug_line_missing_file_complaint (void) -{ - complaint (_(".debug_line section has line data without a file")); -} - -static void -dwarf2_debug_line_missing_end_sequence_complaint (void) -{ - complaint (_(".debug_line section has line " - "program sequence without an end")); -} - -static void -dwarf2_complex_location_expr_complaint (void) -{ - complaint (_("location expression too complex")); -} - -static void -dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2, - int arg3) -{ - complaint (_("const value length mismatch for '%s', got %d, expected %d"), - arg1, arg2, arg3); -} - -static void -dwarf2_section_buffer_overflow_complaint (struct dwarf2_section_info *section) -{ - complaint (_("debug info runs off end of %s section" - " [in module %s]"), - section->get_name (), - section->get_file_name ()); -} - -static void -dwarf2_macro_malformed_definition_complaint (const char *arg1) -{ - complaint (_("macro debug info contains a " - "malformed macro definition:\n`%s'"), - arg1); -} - -static void -dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2) -{ - complaint (_("invalid attribute class or form for '%s' in '%s'"), - arg1, arg2); -} - -/* Hash function for line_header_hash. */ - -static hashval_t -line_header_hash (const struct line_header *ofs) -{ - return to_underlying (ofs->sect_off) ^ ofs->offset_in_dwz; -} - -/* Hash function for htab_create_alloc_ex for line_header_hash. */ - -static hashval_t -line_header_hash_voidp (const void *item) -{ - const struct line_header *ofs = (const struct line_header *) item; - - return line_header_hash (ofs); -} - -/* Equality function for line_header_hash. */ - -static int -line_header_eq_voidp (const void *item_lhs, const void *item_rhs) -{ - const struct line_header *ofs_lhs = (const struct line_header *) item_lhs; - const struct line_header *ofs_rhs = (const struct line_header *) item_rhs; - - return (ofs_lhs->sect_off == ofs_rhs->sect_off - && ofs_lhs->offset_in_dwz == ofs_rhs->offset_in_dwz); -} - - - -/* See declaration. */ - -dwarf2_per_objfile::dwarf2_per_objfile (struct objfile *objfile_, - const dwarf2_debug_sections *names, - bool can_copy_) - : objfile (objfile_), - can_copy (can_copy_) -{ - if (names == NULL) - names = &dwarf2_elf_names; - - bfd *obfd = objfile->obfd; - - for (asection *sec = obfd->sections; sec != NULL; sec = sec->next) - locate_sections (obfd, sec, *names); -} - -dwarf2_per_objfile::~dwarf2_per_objfile () -{ - /* Cached DIE trees use xmalloc and the comp_unit_obstack. */ - free_cached_comp_units (); - - if (quick_file_names_table) - htab_delete (quick_file_names_table); - - if (line_header_hash) - htab_delete (line_header_hash); - - for (dwarf2_per_cu_data *per_cu : all_comp_units) - per_cu->imported_symtabs_free (); - - for (signatured_type *sig_type : all_type_units) - sig_type->per_cu.imported_symtabs_free (); - - /* Everything else should be on the objfile obstack. */ -} - -/* See declaration. */ - -void -dwarf2_per_objfile::free_cached_comp_units () -{ - dwarf2_per_cu_data *per_cu = read_in_chain; - dwarf2_per_cu_data **last_chain = &read_in_chain; - while (per_cu != NULL) - { - dwarf2_per_cu_data *next_cu = per_cu->cu->read_in_chain; - - delete per_cu->cu; - *last_chain = next_cu; - per_cu = next_cu; - } -} - -/* A helper class that calls free_cached_comp_units on - destruction. */ - -class free_cached_comp_units -{ -public: - - explicit free_cached_comp_units (dwarf2_per_objfile *per_objfile) - : m_per_objfile (per_objfile) - { - } - - ~free_cached_comp_units () - { - m_per_objfile->free_cached_comp_units (); - } - - DISABLE_COPY_AND_ASSIGN (free_cached_comp_units); - -private: - - dwarf2_per_objfile *m_per_objfile; -}; - -/* Try to locate the sections we need for DWARF 2 debugging - information and return true if we have enough to do something. - NAMES points to the dwarf2 section names, or is NULL if the standard - ELF names are used. CAN_COPY is true for formats where symbol - interposition is possible and so symbol values must follow copy - relocation rules. */ - -int -dwarf2_has_info (struct objfile *objfile, - const struct dwarf2_debug_sections *names, - bool can_copy) -{ - if (objfile->flags & OBJF_READNEVER) - return 0; - - struct dwarf2_per_objfile *dwarf2_per_objfile - = get_dwarf2_per_objfile (objfile); - - if (dwarf2_per_objfile == NULL) - dwarf2_per_objfile = dwarf2_objfile_data_key.emplace (objfile, objfile, - names, - can_copy); - - return (!dwarf2_per_objfile->info.is_virtual - && dwarf2_per_objfile->info.s.section != NULL - && !dwarf2_per_objfile->abbrev.is_virtual - && dwarf2_per_objfile->abbrev.s.section != NULL); -} - -/* When loading sections, we look either for uncompressed section or for - compressed section names. */ - -static int -section_is_p (const char *section_name, - const struct dwarf2_section_names *names) -{ - if (names->normal != NULL - && strcmp (section_name, names->normal) == 0) - return 1; - if (names->compressed != NULL - && strcmp (section_name, names->compressed) == 0) - return 1; - return 0; -} - -/* See declaration. */ - -void -dwarf2_per_objfile::locate_sections (bfd *abfd, asection *sectp, - const dwarf2_debug_sections &names) -{ - flagword aflag = bfd_section_flags (sectp); - - if ((aflag & SEC_HAS_CONTENTS) == 0) - { - } - else if (elf_section_data (sectp)->this_hdr.sh_size - > bfd_get_file_size (abfd)) - { - bfd_size_type size = elf_section_data (sectp)->this_hdr.sh_size; - warning (_("Discarding section %s which has a section size (%s" - ") larger than the file size [in module %s]"), - bfd_section_name (sectp), phex_nz (size, sizeof (size)), - bfd_get_filename (abfd)); - } - else if (section_is_p (sectp->name, &names.info)) - { - this->info.s.section = sectp; - this->info.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names.abbrev)) - { - this->abbrev.s.section = sectp; - this->abbrev.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names.line)) - { - this->line.s.section = sectp; - this->line.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names.loc)) - { - this->loc.s.section = sectp; - this->loc.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names.loclists)) - { - this->loclists.s.section = sectp; - this->loclists.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names.macinfo)) - { - this->macinfo.s.section = sectp; - this->macinfo.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names.macro)) - { - this->macro.s.section = sectp; - this->macro.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names.str)) - { - this->str.s.section = sectp; - this->str.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names.str_offsets)) - { - this->str_offsets.s.section = sectp; - this->str_offsets.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names.line_str)) - { - this->line_str.s.section = sectp; - this->line_str.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names.addr)) - { - this->addr.s.section = sectp; - this->addr.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names.frame)) - { - this->frame.s.section = sectp; - this->frame.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names.eh_frame)) - { - this->eh_frame.s.section = sectp; - this->eh_frame.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names.ranges)) - { - this->ranges.s.section = sectp; - this->ranges.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names.rnglists)) - { - this->rnglists.s.section = sectp; - this->rnglists.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names.types)) - { - struct dwarf2_section_info type_section; - - memset (&type_section, 0, sizeof (type_section)); - type_section.s.section = sectp; - type_section.size = bfd_section_size (sectp); - - this->types.push_back (type_section); - } - else if (section_is_p (sectp->name, &names.gdb_index)) - { - this->gdb_index.s.section = sectp; - this->gdb_index.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names.debug_names)) - { - this->debug_names.s.section = sectp; - this->debug_names.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names.debug_aranges)) - { - this->debug_aranges.s.section = sectp; - this->debug_aranges.size = bfd_section_size (sectp); - } - - if ((bfd_section_flags (sectp) & (SEC_LOAD | SEC_ALLOC)) - && bfd_section_vma (sectp) == 0) - this->has_section_at_zero = true; -} - -/* A helper function that returns the size of a section in a safe way. - If you are positive that the section has been read before using the - size, then it is safe to refer to the dwarf2_section_info object's - "size" field directly. In other cases, you must call this - function, because for compressed sections the size field is not set - correctly until the section has been read. */ - -static bfd_size_type -dwarf2_section_size (struct objfile *objfile, - struct dwarf2_section_info *info) -{ - if (!info->readin) - info->read (objfile); - return info->size; -} - -/* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and - SECTION_NAME. */ - -void -dwarf2_get_section_info (struct objfile *objfile, - enum dwarf2_section_enum sect, - asection **sectp, const gdb_byte **bufp, - bfd_size_type *sizep) -{ - struct dwarf2_per_objfile *data = dwarf2_objfile_data_key.get (objfile); - struct dwarf2_section_info *info; - - /* We may see an objfile without any DWARF, in which case we just - return nothing. */ - if (data == NULL) - { - *sectp = NULL; - *bufp = NULL; - *sizep = 0; - return; - } - switch (sect) - { - case DWARF2_DEBUG_FRAME: - info = &data->frame; - break; - case DWARF2_EH_FRAME: - info = &data->eh_frame; - break; - default: - gdb_assert_not_reached ("unexpected section"); - } - - info->read (objfile); - - *sectp = info->get_bfd_section (); - *bufp = info->buffer; - *sizep = info->size; -} - -/* A helper function to find the sections for a .dwz file. */ - -static void -locate_dwz_sections (bfd *abfd, asection *sectp, void *arg) -{ - struct dwz_file *dwz_file = (struct dwz_file *) arg; - - /* Note that we only support the standard ELF names, because .dwz - is ELF-only (at the time of writing). */ - if (section_is_p (sectp->name, &dwarf2_elf_names.abbrev)) - { - dwz_file->abbrev.s.section = sectp; - dwz_file->abbrev.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &dwarf2_elf_names.info)) - { - dwz_file->info.s.section = sectp; - dwz_file->info.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &dwarf2_elf_names.str)) - { - dwz_file->str.s.section = sectp; - dwz_file->str.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &dwarf2_elf_names.line)) - { - dwz_file->line.s.section = sectp; - dwz_file->line.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &dwarf2_elf_names.macro)) - { - dwz_file->macro.s.section = sectp; - dwz_file->macro.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &dwarf2_elf_names.gdb_index)) - { - dwz_file->gdb_index.s.section = sectp; - dwz_file->gdb_index.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &dwarf2_elf_names.debug_names)) - { - dwz_file->debug_names.s.section = sectp; - dwz_file->debug_names.size = bfd_section_size (sectp); - } -} - -/* See dwarf2read.h. */ - -struct dwz_file * -dwarf2_get_dwz_file (struct dwarf2_per_objfile *dwarf2_per_objfile) -{ - const char *filename; - bfd_size_type buildid_len_arg; - size_t buildid_len; - bfd_byte *buildid; - - if (dwarf2_per_objfile->dwz_file != NULL) - return dwarf2_per_objfile->dwz_file.get (); - - bfd_set_error (bfd_error_no_error); - gdb::unique_xmalloc_ptr<char> data - (bfd_get_alt_debug_link_info (dwarf2_per_objfile->objfile->obfd, - &buildid_len_arg, &buildid)); - if (data == NULL) - { - if (bfd_get_error () == bfd_error_no_error) - return NULL; - error (_("could not read '.gnu_debugaltlink' section: %s"), - bfd_errmsg (bfd_get_error ())); - } - - gdb::unique_xmalloc_ptr<bfd_byte> buildid_holder (buildid); - - buildid_len = (size_t) buildid_len_arg; - - filename = data.get (); - - std::string abs_storage; - if (!IS_ABSOLUTE_PATH (filename)) - { - gdb::unique_xmalloc_ptr<char> abs - = gdb_realpath (objfile_name (dwarf2_per_objfile->objfile)); - - abs_storage = ldirname (abs.get ()) + SLASH_STRING + filename; - filename = abs_storage.c_str (); - } - - /* First try the file name given in the section. If that doesn't - work, try to use the build-id instead. */ - gdb_bfd_ref_ptr dwz_bfd (gdb_bfd_open (filename, gnutarget, -1)); - if (dwz_bfd != NULL) - { - if (!build_id_verify (dwz_bfd.get (), buildid_len, buildid)) - dwz_bfd.reset (nullptr); - } - - if (dwz_bfd == NULL) - dwz_bfd = build_id_to_debug_bfd (buildid_len, buildid); - - if (dwz_bfd == NULL) - error (_("could not find '.gnu_debugaltlink' file for %s"), - objfile_name (dwarf2_per_objfile->objfile)); - - std::unique_ptr<struct dwz_file> result - (new struct dwz_file (std::move (dwz_bfd))); - - bfd_map_over_sections (result->dwz_bfd.get (), locate_dwz_sections, - result.get ()); - - gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, - result->dwz_bfd.get ()); - dwarf2_per_objfile->dwz_file = std::move (result); - return dwarf2_per_objfile->dwz_file.get (); -} - -/* DWARF quick_symbols_functions support. */ - -/* TUs can share .debug_line entries, and there can be a lot more TUs than - unique line tables, so we maintain a separate table of all .debug_line - derived entries to support the sharing. - All the quick functions need is the list of file names. We discard the - line_header when we're done and don't need to record it here. */ -struct quick_file_names -{ - /* The data used to construct the hash key. */ - struct stmt_list_hash hash; - - /* The number of entries in file_names, real_names. */ - unsigned int num_file_names; - - /* The file names from the line table, after being run through - file_full_name. */ - const char **file_names; - - /* The file names from the line table after being run through - gdb_realpath. These are computed lazily. */ - const char **real_names; -}; - -/* When using the index (and thus not using psymtabs), each CU has an - object of this type. This is used to hold information needed by - the various "quick" methods. */ -struct dwarf2_per_cu_quick_data -{ - /* The file table. This can be NULL if there was no file table - or it's currently not read in. - NOTE: This points into dwarf2_per_objfile->quick_file_names_table. */ - struct quick_file_names *file_names; - - /* The corresponding symbol table. This is NULL if symbols for this - CU have not yet been read. */ - struct compunit_symtab *compunit_symtab; - - /* A temporary mark bit used when iterating over all CUs in - expand_symtabs_matching. */ - unsigned int mark : 1; - - /* True if we've tried to read the file table and found there isn't one. - There will be no point in trying to read it again next time. */ - unsigned int no_file_data : 1; -}; - -/* Utility hash function for a stmt_list_hash. */ - -static hashval_t -hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash) -{ - hashval_t v = 0; - - if (stmt_list_hash->dwo_unit != NULL) - v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file; - v += to_underlying (stmt_list_hash->line_sect_off); - return v; -} - -/* Utility equality function for a stmt_list_hash. */ - -static int -eq_stmt_list_entry (const struct stmt_list_hash *lhs, - const struct stmt_list_hash *rhs) -{ - if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL)) - return 0; - if (lhs->dwo_unit != NULL - && lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file) - return 0; - - return lhs->line_sect_off == rhs->line_sect_off; -} - -/* Hash function for a quick_file_names. */ - -static hashval_t -hash_file_name_entry (const void *e) -{ - const struct quick_file_names *file_data - = (const struct quick_file_names *) e; - - return hash_stmt_list_entry (&file_data->hash); -} - -/* Equality function for a quick_file_names. */ - -static int -eq_file_name_entry (const void *a, const void *b) -{ - const struct quick_file_names *ea = (const struct quick_file_names *) a; - const struct quick_file_names *eb = (const struct quick_file_names *) b; - - return eq_stmt_list_entry (&ea->hash, &eb->hash); -} - -/* Delete function for a quick_file_names. */ - -static void -delete_file_name_entry (void *e) -{ - struct quick_file_names *file_data = (struct quick_file_names *) e; - int i; - - for (i = 0; i < file_data->num_file_names; ++i) - { - xfree ((void*) file_data->file_names[i]); - if (file_data->real_names) - xfree ((void*) file_data->real_names[i]); - } - - /* The space for the struct itself lives on objfile_obstack, - so we don't free it here. */ -} - -/* Create a quick_file_names hash table. */ - -static htab_t -create_quick_file_names_table (unsigned int nr_initial_entries) -{ - return htab_create_alloc (nr_initial_entries, - hash_file_name_entry, eq_file_name_entry, - delete_file_name_entry, xcalloc, xfree); -} - -/* Read in PER_CU->CU. This function is unrelated to symtabs, symtab would - have to be created afterwards. You should call age_cached_comp_units after - processing PER_CU->CU. dw2_setup must have been already called. */ - -static void -load_cu (struct dwarf2_per_cu_data *per_cu, bool skip_partial) -{ - if (per_cu->is_debug_types) - load_full_type_unit (per_cu); - else - load_full_comp_unit (per_cu, skip_partial, language_minimal); - - if (per_cu->cu == NULL) - return; /* Dummy CU. */ - - dwarf2_find_base_address (per_cu->cu->dies, per_cu->cu); -} - -/* Read in the symbols for PER_CU. */ - -static void -dw2_do_instantiate_symtab (struct dwarf2_per_cu_data *per_cu, bool skip_partial) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile; - - /* Skip type_unit_groups, reading the type units they contain - is handled elsewhere. */ - if (IS_TYPE_UNIT_GROUP (per_cu)) - return; - - /* The destructor of dwarf2_queue_guard frees any entries left on - the queue. After this point we're guaranteed to leave this function - with the dwarf queue empty. */ - dwarf2_queue_guard q_guard; - - if (dwarf2_per_objfile->using_index - ? per_cu->v.quick->compunit_symtab == NULL - : (per_cu->v.psymtab == NULL || !per_cu->v.psymtab->readin)) - { - queue_comp_unit (per_cu, language_minimal); - load_cu (per_cu, skip_partial); - - /* If we just loaded a CU from a DWO, and we're working with an index - that may badly handle TUs, load all the TUs in that DWO as well. - http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */ - if (!per_cu->is_debug_types - && per_cu->cu != NULL - && per_cu->cu->dwo_unit != NULL - && dwarf2_per_objfile->index_table != NULL - && dwarf2_per_objfile->index_table->version <= 7 - /* DWP files aren't supported yet. */ - && get_dwp_file (dwarf2_per_objfile) == NULL) - queue_and_load_all_dwo_tus (per_cu); - } - - process_queue (dwarf2_per_objfile); - - /* Age the cache, releasing compilation units that have not - been used recently. */ - age_cached_comp_units (dwarf2_per_objfile); -} - -/* Ensure that the symbols for PER_CU have been read in. OBJFILE is - the objfile from which this CU came. Returns the resulting symbol - table. */ - -static struct compunit_symtab * -dw2_instantiate_symtab (struct dwarf2_per_cu_data *per_cu, bool skip_partial) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile; - - gdb_assert (dwarf2_per_objfile->using_index); - if (!per_cu->v.quick->compunit_symtab) - { - free_cached_comp_units freer (dwarf2_per_objfile); - scoped_restore decrementer = increment_reading_symtab (); - dw2_do_instantiate_symtab (per_cu, skip_partial); - process_cu_includes (dwarf2_per_objfile); - } - - return per_cu->v.quick->compunit_symtab; -} - -/* See declaration. */ - -dwarf2_per_cu_data * -dwarf2_per_objfile::get_cutu (int index) -{ - if (index >= this->all_comp_units.size ()) - { - index -= this->all_comp_units.size (); - gdb_assert (index < this->all_type_units.size ()); - return &this->all_type_units[index]->per_cu; - } - - return this->all_comp_units[index]; -} - -/* See declaration. */ - -dwarf2_per_cu_data * -dwarf2_per_objfile::get_cu (int index) -{ - gdb_assert (index >= 0 && index < this->all_comp_units.size ()); - - return this->all_comp_units[index]; -} - -/* See declaration. */ - -signatured_type * -dwarf2_per_objfile::get_tu (int index) -{ - gdb_assert (index >= 0 && index < this->all_type_units.size ()); - - return this->all_type_units[index]; -} - -/* Return a new dwarf2_per_cu_data allocated on OBJFILE's - objfile_obstack, and constructed with the specified field - values. */ - -static dwarf2_per_cu_data * -create_cu_from_index_list (struct dwarf2_per_objfile *dwarf2_per_objfile, - struct dwarf2_section_info *section, - int is_dwz, - sect_offset sect_off, ULONGEST length) -{ - struct objfile *objfile = dwarf2_per_objfile->objfile; - dwarf2_per_cu_data *the_cu - = OBSTACK_ZALLOC (&objfile->objfile_obstack, - struct dwarf2_per_cu_data); - the_cu->sect_off = sect_off; - the_cu->length = length; - the_cu->dwarf2_per_objfile = dwarf2_per_objfile; - the_cu->section = section; - the_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack, - struct dwarf2_per_cu_quick_data); - the_cu->is_dwz = is_dwz; - return the_cu; -} - -/* A helper for create_cus_from_index that handles a given list of - CUs. */ - -static void -create_cus_from_index_list (struct dwarf2_per_objfile *dwarf2_per_objfile, - const gdb_byte *cu_list, offset_type n_elements, - struct dwarf2_section_info *section, - int is_dwz) -{ - for (offset_type i = 0; i < n_elements; i += 2) - { - gdb_static_assert (sizeof (ULONGEST) >= 8); - - sect_offset sect_off - = (sect_offset) extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE); - ULONGEST length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE); - cu_list += 2 * 8; - - dwarf2_per_cu_data *per_cu - = create_cu_from_index_list (dwarf2_per_objfile, section, is_dwz, - sect_off, length); - dwarf2_per_objfile->all_comp_units.push_back (per_cu); - } -} - -/* Read the CU list from the mapped index, and use it to create all - the CU objects for this objfile. */ - -static void -create_cus_from_index (struct dwarf2_per_objfile *dwarf2_per_objfile, - const gdb_byte *cu_list, offset_type cu_list_elements, - const gdb_byte *dwz_list, offset_type dwz_elements) -{ - gdb_assert (dwarf2_per_objfile->all_comp_units.empty ()); - dwarf2_per_objfile->all_comp_units.reserve - ((cu_list_elements + dwz_elements) / 2); - - create_cus_from_index_list (dwarf2_per_objfile, cu_list, cu_list_elements, - &dwarf2_per_objfile->info, 0); - - if (dwz_elements == 0) - return; - - dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile); - create_cus_from_index_list (dwarf2_per_objfile, dwz_list, dwz_elements, - &dwz->info, 1); -} - -/* Create the signatured type hash table from the index. */ - -static void -create_signatured_type_table_from_index - (struct dwarf2_per_objfile *dwarf2_per_objfile, - struct dwarf2_section_info *section, - const gdb_byte *bytes, - offset_type elements) -{ - struct objfile *objfile = dwarf2_per_objfile->objfile; - - gdb_assert (dwarf2_per_objfile->all_type_units.empty ()); - dwarf2_per_objfile->all_type_units.reserve (elements / 3); - - htab_t sig_types_hash = allocate_signatured_type_table (objfile); - - for (offset_type i = 0; i < elements; i += 3) - { - struct signatured_type *sig_type; - ULONGEST signature; - void **slot; - cu_offset type_offset_in_tu; - - gdb_static_assert (sizeof (ULONGEST) >= 8); - sect_offset sect_off - = (sect_offset) extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE); - type_offset_in_tu - = (cu_offset) extract_unsigned_integer (bytes + 8, 8, - BFD_ENDIAN_LITTLE); - signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE); - bytes += 3 * 8; - - sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack, - struct signatured_type); - sig_type->signature = signature; - sig_type->type_offset_in_tu = type_offset_in_tu; - sig_type->per_cu.is_debug_types = 1; - sig_type->per_cu.section = section; - sig_type->per_cu.sect_off = sect_off; - sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile; - sig_type->per_cu.v.quick - = OBSTACK_ZALLOC (&objfile->objfile_obstack, - struct dwarf2_per_cu_quick_data); - - slot = htab_find_slot (sig_types_hash, sig_type, INSERT); - *slot = sig_type; - - dwarf2_per_objfile->all_type_units.push_back (sig_type); - } - - dwarf2_per_objfile->signatured_types = sig_types_hash; -} - -/* Create the signatured type hash table from .debug_names. */ - -static void -create_signatured_type_table_from_debug_names - (struct dwarf2_per_objfile *dwarf2_per_objfile, - const mapped_debug_names &map, - struct dwarf2_section_info *section, - struct dwarf2_section_info *abbrev_section) -{ - struct objfile *objfile = dwarf2_per_objfile->objfile; - - section->read (objfile); - abbrev_section->read (objfile); - - gdb_assert (dwarf2_per_objfile->all_type_units.empty ()); - dwarf2_per_objfile->all_type_units.reserve (map.tu_count); - - htab_t sig_types_hash = allocate_signatured_type_table (objfile); - - for (uint32_t i = 0; i < map.tu_count; ++i) - { - struct signatured_type *sig_type; - void **slot; - - sect_offset sect_off - = (sect_offset) (extract_unsigned_integer - (map.tu_table_reordered + i * map.offset_size, - map.offset_size, - map.dwarf5_byte_order)); - - comp_unit_head cu_header; - read_and_check_comp_unit_head (dwarf2_per_objfile, &cu_header, section, - abbrev_section, - section->buffer + to_underlying (sect_off), - rcuh_kind::TYPE); - - sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack, - struct signatured_type); - sig_type->signature = cu_header.signature; - sig_type->type_offset_in_tu = cu_header.type_cu_offset_in_tu; - sig_type->per_cu.is_debug_types = 1; - sig_type->per_cu.section = section; - sig_type->per_cu.sect_off = sect_off; - sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile; - sig_type->per_cu.v.quick - = OBSTACK_ZALLOC (&objfile->objfile_obstack, - struct dwarf2_per_cu_quick_data); - - slot = htab_find_slot (sig_types_hash, sig_type, INSERT); - *slot = sig_type; - - dwarf2_per_objfile->all_type_units.push_back (sig_type); - } - - dwarf2_per_objfile->signatured_types = sig_types_hash; -} - -/* Read the address map data from the mapped index, and use it to - populate the objfile's psymtabs_addrmap. */ - -static void -create_addrmap_from_index (struct dwarf2_per_objfile *dwarf2_per_objfile, - struct mapped_index *index) -{ - struct objfile *objfile = dwarf2_per_objfile->objfile; - struct gdbarch *gdbarch = get_objfile_arch (objfile); - const gdb_byte *iter, *end; - struct addrmap *mutable_map; - CORE_ADDR baseaddr; - - auto_obstack temp_obstack; - - mutable_map = addrmap_create_mutable (&temp_obstack); - - iter = index->address_table.data (); - end = iter + index->address_table.size (); - - baseaddr = objfile->text_section_offset (); - - while (iter < end) - { - ULONGEST hi, lo, cu_index; - lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE); - iter += 8; - hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE); - iter += 8; - cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE); - iter += 4; - - if (lo > hi) - { - complaint (_(".gdb_index address table has invalid range (%s - %s)"), - hex_string (lo), hex_string (hi)); - continue; - } - - if (cu_index >= dwarf2_per_objfile->all_comp_units.size ()) - { - complaint (_(".gdb_index address table has invalid CU number %u"), - (unsigned) cu_index); - continue; - } - - lo = gdbarch_adjust_dwarf2_addr (gdbarch, lo + baseaddr) - baseaddr; - hi = gdbarch_adjust_dwarf2_addr (gdbarch, hi + baseaddr) - baseaddr; - addrmap_set_empty (mutable_map, lo, hi - 1, - dwarf2_per_objfile->get_cu (cu_index)); - } - - objfile->partial_symtabs->psymtabs_addrmap - = addrmap_create_fixed (mutable_map, objfile->partial_symtabs->obstack ()); -} - -/* Read the address map data from DWARF-5 .debug_aranges, and use it to - populate the objfile's psymtabs_addrmap. */ - -static void -create_addrmap_from_aranges (struct dwarf2_per_objfile *dwarf2_per_objfile, - struct dwarf2_section_info *section) -{ - struct objfile *objfile = dwarf2_per_objfile->objfile; - bfd *abfd = objfile->obfd; - struct gdbarch *gdbarch = get_objfile_arch (objfile); - const CORE_ADDR baseaddr = objfile->text_section_offset (); - - auto_obstack temp_obstack; - addrmap *mutable_map = addrmap_create_mutable (&temp_obstack); - - std::unordered_map<sect_offset, - dwarf2_per_cu_data *, - gdb::hash_enum<sect_offset>> - debug_info_offset_to_per_cu; - for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units) - { - const auto insertpair - = debug_info_offset_to_per_cu.emplace (per_cu->sect_off, per_cu); - if (!insertpair.second) - { - warning (_("Section .debug_aranges in %s has duplicate " - "debug_info_offset %s, ignoring .debug_aranges."), - objfile_name (objfile), sect_offset_str (per_cu->sect_off)); - return; - } - } - - section->read (objfile); - - const bfd_endian dwarf5_byte_order = gdbarch_byte_order (gdbarch); - - const gdb_byte *addr = section->buffer; - - while (addr < section->buffer + section->size) - { - const gdb_byte *const entry_addr = addr; - unsigned int bytes_read; - - const LONGEST entry_length = read_initial_length (abfd, addr, - &bytes_read); - addr += bytes_read; - - const gdb_byte *const entry_end = addr + entry_length; - const bool dwarf5_is_dwarf64 = bytes_read != 4; - const uint8_t offset_size = dwarf5_is_dwarf64 ? 8 : 4; - if (addr + entry_length > section->buffer + section->size) - { - warning (_("Section .debug_aranges in %s entry at offset %s " - "length %s exceeds section length %s, " - "ignoring .debug_aranges."), - objfile_name (objfile), - plongest (entry_addr - section->buffer), - plongest (bytes_read + entry_length), - pulongest (section->size)); - return; - } - - /* The version number. */ - const uint16_t version = read_2_bytes (abfd, addr); - addr += 2; - if (version != 2) - { - warning (_("Section .debug_aranges in %s entry at offset %s " - "has unsupported version %d, ignoring .debug_aranges."), - objfile_name (objfile), - plongest (entry_addr - section->buffer), version); - return; - } - - const uint64_t debug_info_offset - = extract_unsigned_integer (addr, offset_size, dwarf5_byte_order); - addr += offset_size; - const auto per_cu_it - = debug_info_offset_to_per_cu.find (sect_offset (debug_info_offset)); - if (per_cu_it == debug_info_offset_to_per_cu.cend ()) - { - warning (_("Section .debug_aranges in %s entry at offset %s " - "debug_info_offset %s does not exists, " - "ignoring .debug_aranges."), - objfile_name (objfile), - plongest (entry_addr - section->buffer), - pulongest (debug_info_offset)); - return; - } - dwarf2_per_cu_data *const per_cu = per_cu_it->second; - - const uint8_t address_size = *addr++; - if (address_size < 1 || address_size > 8) - { - warning (_("Section .debug_aranges in %s entry at offset %s " - "address_size %u is invalid, ignoring .debug_aranges."), - objfile_name (objfile), - plongest (entry_addr - section->buffer), address_size); - return; - } - - const uint8_t segment_selector_size = *addr++; - if (segment_selector_size != 0) - { - warning (_("Section .debug_aranges in %s entry at offset %s " - "segment_selector_size %u is not supported, " - "ignoring .debug_aranges."), - objfile_name (objfile), - plongest (entry_addr - section->buffer), - segment_selector_size); - return; - } - - /* Must pad to an alignment boundary that is twice the address - size. It is undocumented by the DWARF standard but GCC does - use it. */ - for (size_t padding = ((-(addr - section->buffer)) - & (2 * address_size - 1)); - padding > 0; padding--) - if (*addr++ != 0) - { - warning (_("Section .debug_aranges in %s entry at offset %s " - "padding is not zero, ignoring .debug_aranges."), - objfile_name (objfile), - plongest (entry_addr - section->buffer)); - return; - } - - for (;;) - { - if (addr + 2 * address_size > entry_end) - { - warning (_("Section .debug_aranges in %s entry at offset %s " - "address list is not properly terminated, " - "ignoring .debug_aranges."), - objfile_name (objfile), - plongest (entry_addr - section->buffer)); - return; - } - ULONGEST start = extract_unsigned_integer (addr, address_size, - dwarf5_byte_order); - addr += address_size; - ULONGEST length = extract_unsigned_integer (addr, address_size, - dwarf5_byte_order); - addr += address_size; - if (start == 0 && length == 0) - break; - if (start == 0 && !dwarf2_per_objfile->has_section_at_zero) - { - /* Symbol was eliminated due to a COMDAT group. */ - continue; - } - ULONGEST end = start + length; - start = (gdbarch_adjust_dwarf2_addr (gdbarch, start + baseaddr) - - baseaddr); - end = (gdbarch_adjust_dwarf2_addr (gdbarch, end + baseaddr) - - baseaddr); - addrmap_set_empty (mutable_map, start, end - 1, per_cu); - } - } - - objfile->partial_symtabs->psymtabs_addrmap - = addrmap_create_fixed (mutable_map, objfile->partial_symtabs->obstack ()); -} - -/* Find a slot in the mapped index INDEX for the object named NAME. - If NAME is found, set *VEC_OUT to point to the CU vector in the - constant pool and return true. If NAME cannot be found, return - false. */ - -static bool -find_slot_in_mapped_hash (struct mapped_index *index, const char *name, - offset_type **vec_out) -{ - offset_type hash; - offset_type slot, step; - int (*cmp) (const char *, const char *); - - gdb::unique_xmalloc_ptr<char> without_params; - if (current_language->la_language == language_cplus - || current_language->la_language == language_fortran - || current_language->la_language == language_d) - { - /* NAME is already canonical. Drop any qualifiers as .gdb_index does - not contain any. */ - - if (strchr (name, '(') != NULL) - { - without_params = cp_remove_params (name); - - if (without_params != NULL) - name = without_params.get (); - } - } - - /* Index version 4 did not support case insensitive searches. But the - indices for case insensitive languages are built in lowercase, therefore - simulate our NAME being searched is also lowercased. */ - hash = mapped_index_string_hash ((index->version == 4 - && case_sensitivity == case_sensitive_off - ? 5 : index->version), - name); - - slot = hash & (index->symbol_table.size () - 1); - step = ((hash * 17) & (index->symbol_table.size () - 1)) | 1; - cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp); - - for (;;) - { - const char *str; - - const auto &bucket = index->symbol_table[slot]; - if (bucket.name == 0 && bucket.vec == 0) - return false; - - str = index->constant_pool + MAYBE_SWAP (bucket.name); - if (!cmp (name, str)) - { - *vec_out = (offset_type *) (index->constant_pool - + MAYBE_SWAP (bucket.vec)); - return true; - } - - slot = (slot + step) & (index->symbol_table.size () - 1); - } -} - -/* A helper function that reads the .gdb_index from BUFFER and fills - in MAP. FILENAME is the name of the file containing the data; - it is used for error reporting. DEPRECATED_OK is true if it is - ok to use deprecated sections. - - CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are - out parameters that are filled in with information about the CU and - TU lists in the section. - - Returns true if all went well, false otherwise. */ - -static bool -read_gdb_index_from_buffer (struct objfile *objfile, - const char *filename, - bool deprecated_ok, - gdb::array_view<const gdb_byte> buffer, - struct mapped_index *map, - const gdb_byte **cu_list, - offset_type *cu_list_elements, - const gdb_byte **types_list, - offset_type *types_list_elements) -{ - const gdb_byte *addr = &buffer[0]; - - /* Version check. */ - offset_type version = MAYBE_SWAP (*(offset_type *) addr); - /* Versions earlier than 3 emitted every copy of a psymbol. This - causes the index to behave very poorly for certain requests. Version 3 - contained incomplete addrmap. So, it seems better to just ignore such - indices. */ - if (version < 4) - { - static int warning_printed = 0; - if (!warning_printed) - { - warning (_("Skipping obsolete .gdb_index section in %s."), - filename); - warning_printed = 1; - } - return 0; - } - /* Index version 4 uses a different hash function than index version - 5 and later. - - Versions earlier than 6 did not emit psymbols for inlined - functions. Using these files will cause GDB not to be able to - set breakpoints on inlined functions by name, so we ignore these - indices unless the user has done - "set use-deprecated-index-sections on". */ - if (version < 6 && !deprecated_ok) - { - static int warning_printed = 0; - if (!warning_printed) - { - warning (_("\ -Skipping deprecated .gdb_index section in %s.\n\ -Do \"set use-deprecated-index-sections on\" before the file is read\n\ -to use the section anyway."), - filename); - warning_printed = 1; - } - return 0; - } - /* Version 7 indices generated by gold refer to the CU for a symbol instead - of the TU (for symbols coming from TUs), - http://sourceware.org/bugzilla/show_bug.cgi?id=15021. - Plus gold-generated indices can have duplicate entries for global symbols, - http://sourceware.org/bugzilla/show_bug.cgi?id=15646. - These are just performance bugs, and we can't distinguish gdb-generated - indices from gold-generated ones, so issue no warning here. */ - - /* Indexes with higher version than the one supported by GDB may be no - longer backward compatible. */ - if (version > 8) - return 0; - - map->version = version; - - offset_type *metadata = (offset_type *) (addr + sizeof (offset_type)); - - int i = 0; - *cu_list = addr + MAYBE_SWAP (metadata[i]); - *cu_list_elements = ((MAYBE_SWAP (metadata[i + 1]) - MAYBE_SWAP (metadata[i])) - / 8); - ++i; - - *types_list = addr + MAYBE_SWAP (metadata[i]); - *types_list_elements = ((MAYBE_SWAP (metadata[i + 1]) - - MAYBE_SWAP (metadata[i])) - / 8); - ++i; - - const gdb_byte *address_table = addr + MAYBE_SWAP (metadata[i]); - const gdb_byte *address_table_end = addr + MAYBE_SWAP (metadata[i + 1]); - map->address_table - = gdb::array_view<const gdb_byte> (address_table, address_table_end); - ++i; - - const gdb_byte *symbol_table = addr + MAYBE_SWAP (metadata[i]); - const gdb_byte *symbol_table_end = addr + MAYBE_SWAP (metadata[i + 1]); - map->symbol_table - = gdb::array_view<mapped_index::symbol_table_slot> - ((mapped_index::symbol_table_slot *) symbol_table, - (mapped_index::symbol_table_slot *) symbol_table_end); - - ++i; - map->constant_pool = (char *) (addr + MAYBE_SWAP (metadata[i])); - - return 1; -} - -/* Callback types for dwarf2_read_gdb_index. */ - -typedef gdb::function_view - <gdb::array_view<const gdb_byte>(objfile *, dwarf2_per_objfile *)> - get_gdb_index_contents_ftype; -typedef gdb::function_view - <gdb::array_view<const gdb_byte>(objfile *, dwz_file *)> - get_gdb_index_contents_dwz_ftype; - -/* Read .gdb_index. If everything went ok, initialize the "quick" - elements of all the CUs and return 1. Otherwise, return 0. */ - -static int -dwarf2_read_gdb_index - (struct dwarf2_per_objfile *dwarf2_per_objfile, - get_gdb_index_contents_ftype get_gdb_index_contents, - get_gdb_index_contents_dwz_ftype get_gdb_index_contents_dwz) -{ - const gdb_byte *cu_list, *types_list, *dwz_list = NULL; - offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0; - struct dwz_file *dwz; - struct objfile *objfile = dwarf2_per_objfile->objfile; - - gdb::array_view<const gdb_byte> main_index_contents - = get_gdb_index_contents (objfile, dwarf2_per_objfile); - - if (main_index_contents.empty ()) - return 0; - - std::unique_ptr<struct mapped_index> map (new struct mapped_index); - if (!read_gdb_index_from_buffer (objfile, objfile_name (objfile), - use_deprecated_index_sections, - main_index_contents, map.get (), &cu_list, - &cu_list_elements, &types_list, - &types_list_elements)) - return 0; - - /* Don't use the index if it's empty. */ - if (map->symbol_table.empty ()) - return 0; - - /* If there is a .dwz file, read it so we can get its CU list as - well. */ - dwz = dwarf2_get_dwz_file (dwarf2_per_objfile); - if (dwz != NULL) - { - struct mapped_index dwz_map; - const gdb_byte *dwz_types_ignore; - offset_type dwz_types_elements_ignore; - - gdb::array_view<const gdb_byte> dwz_index_content - = get_gdb_index_contents_dwz (objfile, dwz); - - if (dwz_index_content.empty ()) - return 0; - - if (!read_gdb_index_from_buffer (objfile, - bfd_get_filename (dwz->dwz_bfd.get ()), - 1, dwz_index_content, &dwz_map, - &dwz_list, &dwz_list_elements, - &dwz_types_ignore, - &dwz_types_elements_ignore)) - { - warning (_("could not read '.gdb_index' section from %s; skipping"), - bfd_get_filename (dwz->dwz_bfd.get ())); - return 0; - } - } - - create_cus_from_index (dwarf2_per_objfile, cu_list, cu_list_elements, - dwz_list, dwz_list_elements); - - if (types_list_elements) - { - /* We can only handle a single .debug_types when we have an - index. */ - if (dwarf2_per_objfile->types.size () != 1) - return 0; - - dwarf2_section_info *section = &dwarf2_per_objfile->types[0]; - - create_signatured_type_table_from_index (dwarf2_per_objfile, section, - types_list, types_list_elements); - } - - create_addrmap_from_index (dwarf2_per_objfile, map.get ()); - - dwarf2_per_objfile->index_table = std::move (map); - dwarf2_per_objfile->using_index = 1; - dwarf2_per_objfile->quick_file_names_table = - create_quick_file_names_table (dwarf2_per_objfile->all_comp_units.size ()); - - return 1; -} - -/* die_reader_func for dw2_get_file_names. */ - -static void -dw2_get_file_names_reader (const struct die_reader_specs *reader, - const gdb_byte *info_ptr, - struct die_info *comp_unit_die, - int has_children) -{ - struct dwarf2_cu *cu = reader->cu; - struct dwarf2_per_cu_data *this_cu = cu->per_cu; - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - struct objfile *objfile = dwarf2_per_objfile->objfile; - struct dwarf2_per_cu_data *lh_cu; - struct attribute *attr; - void **slot; - struct quick_file_names *qfn; - - gdb_assert (! this_cu->is_debug_types); - - /* Our callers never want to match partial units -- instead they - will match the enclosing full CU. */ - if (comp_unit_die->tag == DW_TAG_partial_unit) - { - this_cu->v.quick->no_file_data = 1; - return; - } - - lh_cu = this_cu; - slot = NULL; - - line_header_up lh; - sect_offset line_offset {}; - - attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu); - if (attr != nullptr) - { - struct quick_file_names find_entry; - - line_offset = (sect_offset) DW_UNSND (attr); - - /* We may have already read in this line header (TU line header sharing). - If we have we're done. */ - find_entry.hash.dwo_unit = cu->dwo_unit; - find_entry.hash.line_sect_off = line_offset; - slot = htab_find_slot (dwarf2_per_objfile->quick_file_names_table, - &find_entry, INSERT); - if (*slot != NULL) - { - lh_cu->v.quick->file_names = (struct quick_file_names *) *slot; - return; - } - - lh = dwarf_decode_line_header (line_offset, cu); - } - if (lh == NULL) - { - lh_cu->v.quick->no_file_data = 1; - return; - } - - qfn = XOBNEW (&objfile->objfile_obstack, struct quick_file_names); - qfn->hash.dwo_unit = cu->dwo_unit; - qfn->hash.line_sect_off = line_offset; - gdb_assert (slot != NULL); - *slot = qfn; - - file_and_directory fnd = find_file_and_directory (comp_unit_die, cu); - - int offset = 0; - if (strcmp (fnd.name, "<unknown>") != 0) - ++offset; - - qfn->num_file_names = offset + lh->file_names_size (); - qfn->file_names = - XOBNEWVEC (&objfile->objfile_obstack, const char *, qfn->num_file_names); - if (offset != 0) - qfn->file_names[0] = xstrdup (fnd.name); - for (int i = 0; i < lh->file_names_size (); ++i) - qfn->file_names[i + offset] = file_full_name (i + 1, lh.get (), fnd.comp_dir); - qfn->real_names = NULL; - - lh_cu->v.quick->file_names = qfn; -} - -/* A helper for the "quick" functions which attempts to read the line - table for THIS_CU. */ - -static struct quick_file_names * -dw2_get_file_names (struct dwarf2_per_cu_data *this_cu) -{ - /* This should never be called for TUs. */ - gdb_assert (! this_cu->is_debug_types); - /* Nor type unit groups. */ - gdb_assert (! IS_TYPE_UNIT_GROUP (this_cu)); - - if (this_cu->v.quick->file_names != NULL) - return this_cu->v.quick->file_names; - /* If we know there is no line data, no point in looking again. */ - if (this_cu->v.quick->no_file_data) - return NULL; - - cutu_reader reader (this_cu); - if (!reader.dummy_p) - dw2_get_file_names_reader (&reader, reader.info_ptr, reader.comp_unit_die, - reader.has_children); - - if (this_cu->v.quick->no_file_data) - return NULL; - return this_cu->v.quick->file_names; -} - -/* A helper for the "quick" functions which computes and caches the - real path for a given file name from the line table. */ - -static const char * -dw2_get_real_path (struct objfile *objfile, - struct quick_file_names *qfn, int index) -{ - if (qfn->real_names == NULL) - qfn->real_names = OBSTACK_CALLOC (&objfile->objfile_obstack, - qfn->num_file_names, const char *); - - if (qfn->real_names[index] == NULL) - qfn->real_names[index] = gdb_realpath (qfn->file_names[index]).release (); - - return qfn->real_names[index]; -} - -static struct symtab * -dw2_find_last_source_symtab (struct objfile *objfile) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = get_dwarf2_per_objfile (objfile); - dwarf2_per_cu_data *dwarf_cu = dwarf2_per_objfile->all_comp_units.back (); - compunit_symtab *cust = dw2_instantiate_symtab (dwarf_cu, false); - - if (cust == NULL) - return NULL; - - return compunit_primary_filetab (cust); -} - -/* Traversal function for dw2_forget_cached_source_info. */ - -static int -dw2_free_cached_file_names (void **slot, void *info) -{ - struct quick_file_names *file_data = (struct quick_file_names *) *slot; - - if (file_data->real_names) - { - int i; - - for (i = 0; i < file_data->num_file_names; ++i) - { - xfree ((void*) file_data->real_names[i]); - file_data->real_names[i] = NULL; - } - } - - return 1; -} - -static void -dw2_forget_cached_source_info (struct objfile *objfile) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = get_dwarf2_per_objfile (objfile); - - htab_traverse_noresize (dwarf2_per_objfile->quick_file_names_table, - dw2_free_cached_file_names, NULL); -} - -/* Helper function for dw2_map_symtabs_matching_filename that expands - the symtabs and calls the iterator. */ - -static int -dw2_map_expand_apply (struct objfile *objfile, - struct dwarf2_per_cu_data *per_cu, - const char *name, const char *real_path, - gdb::function_view<bool (symtab *)> callback) -{ - struct compunit_symtab *last_made = objfile->compunit_symtabs; - - /* Don't visit already-expanded CUs. */ - if (per_cu->v.quick->compunit_symtab) - return 0; - - /* This may expand more than one symtab, and we want to iterate over - all of them. */ - dw2_instantiate_symtab (per_cu, false); - - return iterate_over_some_symtabs (name, real_path, objfile->compunit_symtabs, - last_made, callback); -} - -/* Implementation of the map_symtabs_matching_filename method. */ - -static bool -dw2_map_symtabs_matching_filename - (struct objfile *objfile, const char *name, const char *real_path, - gdb::function_view<bool (symtab *)> callback) -{ - const char *name_basename = lbasename (name); - struct dwarf2_per_objfile *dwarf2_per_objfile - = get_dwarf2_per_objfile (objfile); - - /* The rule is CUs specify all the files, including those used by - any TU, so there's no need to scan TUs here. */ - - for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units) - { - /* We only need to look at symtabs not already expanded. */ - if (per_cu->v.quick->compunit_symtab) - continue; - - quick_file_names *file_data = dw2_get_file_names (per_cu); - if (file_data == NULL) - continue; - - for (int j = 0; j < file_data->num_file_names; ++j) - { - const char *this_name = file_data->file_names[j]; - const char *this_real_name; - - if (compare_filenames_for_search (this_name, name)) - { - if (dw2_map_expand_apply (objfile, per_cu, name, real_path, - callback)) - return true; - continue; - } - - /* Before we invoke realpath, which can get expensive when many - files are involved, do a quick comparison of the basenames. */ - if (! basenames_may_differ - && FILENAME_CMP (lbasename (this_name), name_basename) != 0) - continue; - - this_real_name = dw2_get_real_path (objfile, file_data, j); - if (compare_filenames_for_search (this_real_name, name)) - { - if (dw2_map_expand_apply (objfile, per_cu, name, real_path, - callback)) - return true; - continue; - } - - if (real_path != NULL) - { - gdb_assert (IS_ABSOLUTE_PATH (real_path)); - gdb_assert (IS_ABSOLUTE_PATH (name)); - if (this_real_name != NULL - && FILENAME_CMP (real_path, this_real_name) == 0) - { - if (dw2_map_expand_apply (objfile, per_cu, name, real_path, - callback)) - return true; - continue; - } - } - } - } - - return false; -} - -/* Struct used to manage iterating over all CUs looking for a symbol. */ - -struct dw2_symtab_iterator -{ - /* The dwarf2_per_objfile owning the CUs we are iterating on. */ - struct dwarf2_per_objfile *dwarf2_per_objfile; - /* If set, only look for symbols that match that block. Valid values are - GLOBAL_BLOCK and STATIC_BLOCK. */ - gdb::optional<block_enum> block_index; - /* The kind of symbol we're looking for. */ - domain_enum domain; - /* The list of CUs from the index entry of the symbol, - or NULL if not found. */ - offset_type *vec; - /* The next element in VEC to look at. */ - int next; - /* The number of elements in VEC, or zero if there is no match. */ - int length; - /* Have we seen a global version of the symbol? - If so we can ignore all further global instances. - This is to work around gold/15646, inefficient gold-generated - indices. */ - int global_seen; -}; - -/* Initialize the index symtab iterator ITER. */ - -static void -dw2_symtab_iter_init (struct dw2_symtab_iterator *iter, - struct dwarf2_per_objfile *dwarf2_per_objfile, - gdb::optional<block_enum> block_index, - domain_enum domain, - const char *name) -{ - iter->dwarf2_per_objfile = dwarf2_per_objfile; - iter->block_index = block_index; - iter->domain = domain; - iter->next = 0; - iter->global_seen = 0; - - mapped_index *index = dwarf2_per_objfile->index_table.get (); - - /* index is NULL if OBJF_READNOW. */ - if (index != NULL && find_slot_in_mapped_hash (index, name, &iter->vec)) - iter->length = MAYBE_SWAP (*iter->vec); - else - { - iter->vec = NULL; - iter->length = 0; - } -} - -/* Return the next matching CU or NULL if there are no more. */ - -static struct dwarf2_per_cu_data * -dw2_symtab_iter_next (struct dw2_symtab_iterator *iter) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile = iter->dwarf2_per_objfile; - - for ( ; iter->next < iter->length; ++iter->next) - { - offset_type cu_index_and_attrs = - MAYBE_SWAP (iter->vec[iter->next + 1]); - offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs); - gdb_index_symbol_kind symbol_kind = - GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs); - /* Only check the symbol attributes if they're present. - Indices prior to version 7 don't record them, - and indices >= 7 may elide them for certain symbols - (gold does this). */ - int attrs_valid = - (dwarf2_per_objfile->index_table->version >= 7 - && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE); - - /* Don't crash on bad data. */ - if (cu_index >= (dwarf2_per_objfile->all_comp_units.size () - + dwarf2_per_objfile->all_type_units.size ())) - { - complaint (_(".gdb_index entry has bad CU index" - " [in module %s]"), - objfile_name (dwarf2_per_objfile->objfile)); - continue; - } - - dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (cu_index); - - /* Skip if already read in. */ - if (per_cu->v.quick->compunit_symtab) - continue; - - /* Check static vs global. */ - if (attrs_valid) - { - bool is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs); - - if (iter->block_index.has_value ()) - { - bool want_static = *iter->block_index == STATIC_BLOCK; - - if (is_static != want_static) - continue; - } - - /* Work around gold/15646. */ - if (!is_static && iter->global_seen) - continue; - if (!is_static) - iter->global_seen = 1; - } - - /* Only check the symbol's kind if it has one. */ - if (attrs_valid) - { - switch (iter->domain) - { - case VAR_DOMAIN: - if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE - && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION - /* Some types are also in VAR_DOMAIN. */ - && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE) - continue; - break; - case STRUCT_DOMAIN: - if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE) - continue; - break; - case LABEL_DOMAIN: - if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER) - continue; - break; - case MODULE_DOMAIN: - if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER) - continue; - break; - default: - break; - } - } - - ++iter->next; - return per_cu; - } - - return NULL; -} - -static struct compunit_symtab * -dw2_lookup_symbol (struct objfile *objfile, block_enum block_index, - const char *name, domain_enum domain) -{ - struct compunit_symtab *stab_best = NULL; - struct dwarf2_per_objfile *dwarf2_per_objfile - = get_dwarf2_per_objfile (objfile); - - lookup_name_info lookup_name (name, symbol_name_match_type::FULL); - - struct dw2_symtab_iterator iter; - struct dwarf2_per_cu_data *per_cu; - - dw2_symtab_iter_init (&iter, dwarf2_per_objfile, block_index, domain, name); - - while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL) - { - struct symbol *sym, *with_opaque = NULL; - struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu, false); - const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab); - const struct block *block = BLOCKVECTOR_BLOCK (bv, block_index); - - sym = block_find_symbol (block, name, domain, - block_find_non_opaque_type_preferred, - &with_opaque); - - /* Some caution must be observed with overloaded functions - and methods, since the index will not contain any overload - information (but NAME might contain it). */ - - if (sym != NULL - && SYMBOL_MATCHES_SEARCH_NAME (sym, lookup_name)) - return stab; - if (with_opaque != NULL - && SYMBOL_MATCHES_SEARCH_NAME (with_opaque, lookup_name)) - stab_best = stab; - - /* Keep looking through other CUs. */ - } - - return stab_best; -} - -static void -dw2_print_stats (struct objfile *objfile) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = get_dwarf2_per_objfile (objfile); - int total = (dwarf2_per_objfile->all_comp_units.size () - + dwarf2_per_objfile->all_type_units.size ()); - int count = 0; - - for (int i = 0; i < total; ++i) - { - dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (i); - - if (!per_cu->v.quick->compunit_symtab) - ++count; - } - printf_filtered (_(" Number of read CUs: %d\n"), total - count); - printf_filtered (_(" Number of unread CUs: %d\n"), count); -} - -/* This dumps minimal information about the index. - It is called via "mt print objfiles". - One use is to verify .gdb_index has been loaded by the - gdb.dwarf2/gdb-index.exp testcase. */ - -static void -dw2_dump (struct objfile *objfile) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = get_dwarf2_per_objfile (objfile); - - gdb_assert (dwarf2_per_objfile->using_index); - printf_filtered (".gdb_index:"); - if (dwarf2_per_objfile->index_table != NULL) - { - printf_filtered (" version %d\n", - dwarf2_per_objfile->index_table->version); - } - else - printf_filtered (" faked for \"readnow\"\n"); - printf_filtered ("\n"); -} - -static void -dw2_expand_symtabs_for_function (struct objfile *objfile, - const char *func_name) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = get_dwarf2_per_objfile (objfile); - - struct dw2_symtab_iterator iter; - struct dwarf2_per_cu_data *per_cu; - - dw2_symtab_iter_init (&iter, dwarf2_per_objfile, {}, VAR_DOMAIN, func_name); - - while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL) - dw2_instantiate_symtab (per_cu, false); - -} - -static void -dw2_expand_all_symtabs (struct objfile *objfile) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = get_dwarf2_per_objfile (objfile); - int total_units = (dwarf2_per_objfile->all_comp_units.size () - + dwarf2_per_objfile->all_type_units.size ()); - - for (int i = 0; i < total_units; ++i) - { - dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (i); - - /* We don't want to directly expand a partial CU, because if we - read it with the wrong language, then assertion failures can - be triggered later on. See PR symtab/23010. So, tell - dw2_instantiate_symtab to skip partial CUs -- any important - partial CU will be read via DW_TAG_imported_unit anyway. */ - dw2_instantiate_symtab (per_cu, true); - } -} - -static void -dw2_expand_symtabs_with_fullname (struct objfile *objfile, - const char *fullname) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = get_dwarf2_per_objfile (objfile); - - /* We don't need to consider type units here. - This is only called for examining code, e.g. expand_line_sal. - There can be an order of magnitude (or more) more type units - than comp units, and we avoid them if we can. */ - - for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units) - { - /* We only need to look at symtabs not already expanded. */ - if (per_cu->v.quick->compunit_symtab) - continue; - - quick_file_names *file_data = dw2_get_file_names (per_cu); - if (file_data == NULL) - continue; - - for (int j = 0; j < file_data->num_file_names; ++j) - { - const char *this_fullname = file_data->file_names[j]; - - if (filename_cmp (this_fullname, fullname) == 0) - { - dw2_instantiate_symtab (per_cu, false); - break; - } - } - } -} - -static void -dw2_map_matching_symbols - (struct objfile *objfile, - const lookup_name_info &name, domain_enum domain, - int global, - gdb::function_view<symbol_found_callback_ftype> callback, - symbol_compare_ftype *ordered_compare) -{ - /* Currently unimplemented; used for Ada. The function can be called if the - current language is Ada for a non-Ada objfile using GNU index. As Ada - does not look for non-Ada symbols this function should just return. */ -} - -/* Starting from a search name, return the string that finds the upper - bound of all strings that start with SEARCH_NAME in a sorted name - list. Returns the empty string to indicate that the upper bound is - the end of the list. */ - -static std::string -make_sort_after_prefix_name (const char *search_name) -{ - /* When looking to complete "func", we find the upper bound of all - symbols that start with "func" by looking for where we'd insert - the closest string that would follow "func" in lexicographical - order. Usually, that's "func"-with-last-character-incremented, - i.e. "fund". Mind non-ASCII characters, though. Usually those - will be UTF-8 multi-byte sequences, but we can't be certain. - Especially mind the 0xff character, which is a valid character in - non-UTF-8 source character sets (e.g. Latin1 'ÿ'), and we can't - rule out compilers allowing it in identifiers. Note that - conveniently, strcmp/strcasecmp are specified to compare - characters interpreted as unsigned char. So what we do is treat - the whole string as a base 256 number composed of a sequence of - base 256 "digits" and add 1 to it. I.e., adding 1 to 0xff wraps - to 0, and carries 1 to the following more-significant position. - If the very first character in SEARCH_NAME ends up incremented - and carries/overflows, then the upper bound is the end of the - list. The string after the empty string is also the empty - string. - - Some examples of this operation: - - SEARCH_NAME => "+1" RESULT - - "abc" => "abd" - "ab\xff" => "ac" - "\xff" "a" "\xff" => "\xff" "b" - "\xff" => "" - "\xff\xff" => "" - "" => "" - - Then, with these symbols for example: - - func - func1 - fund - - completing "func" looks for symbols between "func" and - "func"-with-last-character-incremented, i.e. "fund" (exclusive), - which finds "func" and "func1", but not "fund". - - And with: - - funcÿ (Latin1 'ÿ' [0xff]) - funcÿ1 - fund - - completing "funcÿ" looks for symbols between "funcÿ" and "fund" - (exclusive), which finds "funcÿ" and "funcÿ1", but not "fund". - - And with: - - ÿÿ (Latin1 'ÿ' [0xff]) - ÿÿ1 - - completing "ÿ" or "ÿÿ" looks for symbols between between "ÿÿ" and - the end of the list. - */ - std::string after = search_name; - while (!after.empty () && (unsigned char) after.back () == 0xff) - after.pop_back (); - if (!after.empty ()) - after.back () = (unsigned char) after.back () + 1; - return after; -} - -/* See declaration. */ - -std::pair<std::vector<name_component>::const_iterator, - std::vector<name_component>::const_iterator> -mapped_index_base::find_name_components_bounds - (const lookup_name_info &lookup_name_without_params, language lang) const -{ - auto *name_cmp - = this->name_components_casing == case_sensitive_on ? strcmp : strcasecmp; - - const char *lang_name - = lookup_name_without_params.language_lookup_name (lang).c_str (); - - /* Comparison function object for lower_bound that matches against a - given symbol name. */ - auto lookup_compare_lower = [&] (const name_component &elem, - const char *name) - { - const char *elem_qualified = this->symbol_name_at (elem.idx); - const char *elem_name = elem_qualified + elem.name_offset; - return name_cmp (elem_name, name) < 0; - }; - - /* Comparison function object for upper_bound that matches against a - given symbol name. */ - auto lookup_compare_upper = [&] (const char *name, - const name_component &elem) - { - const char *elem_qualified = this->symbol_name_at (elem.idx); - const char *elem_name = elem_qualified + elem.name_offset; - return name_cmp (name, elem_name) < 0; - }; - - auto begin = this->name_components.begin (); - auto end = this->name_components.end (); - - /* Find the lower bound. */ - auto lower = [&] () - { - if (lookup_name_without_params.completion_mode () && lang_name[0] == '\0') - return begin; - else - return std::lower_bound (begin, end, lang_name, lookup_compare_lower); - } (); - - /* Find the upper bound. */ - auto upper = [&] () - { - if (lookup_name_without_params.completion_mode ()) - { - /* In completion mode, we want UPPER to point past all - symbols names that have the same prefix. I.e., with - these symbols, and completing "func": - - function << lower bound - function1 - other_function << upper bound - - We find the upper bound by looking for the insertion - point of "func"-with-last-character-incremented, - i.e. "fund". */ - std::string after = make_sort_after_prefix_name (lang_name); - if (after.empty ()) - return end; - return std::lower_bound (lower, end, after.c_str (), - lookup_compare_lower); - } - else - return std::upper_bound (lower, end, lang_name, lookup_compare_upper); - } (); - - return {lower, upper}; -} - -/* See declaration. */ - -void -mapped_index_base::build_name_components () -{ - if (!this->name_components.empty ()) - return; - - this->name_components_casing = case_sensitivity; - auto *name_cmp - = this->name_components_casing == case_sensitive_on ? strcmp : strcasecmp; - - /* The code below only knows how to break apart components of C++ - symbol names (and other languages that use '::' as - namespace/module separator) and Ada symbol names. */ - auto count = this->symbol_name_count (); - for (offset_type idx = 0; idx < count; idx++) - { - if (this->symbol_name_slot_invalid (idx)) - continue; - - const char *name = this->symbol_name_at (idx); - - /* Add each name component to the name component table. */ - unsigned int previous_len = 0; - - if (strstr (name, "::") != nullptr) - { - for (unsigned int current_len = cp_find_first_component (name); - name[current_len] != '\0'; - current_len += cp_find_first_component (name + current_len)) - { - gdb_assert (name[current_len] == ':'); - this->name_components.push_back ({previous_len, idx}); - /* Skip the '::'. */ - current_len += 2; - previous_len = current_len; - } - } - else - { - /* Handle the Ada encoded (aka mangled) form here. */ - for (const char *iter = strstr (name, "__"); - iter != nullptr; - iter = strstr (iter, "__")) - { - this->name_components.push_back ({previous_len, idx}); - iter += 2; - previous_len = iter - name; - } - } - - this->name_components.push_back ({previous_len, idx}); - } - - /* Sort name_components elements by name. */ - auto name_comp_compare = [&] (const name_component &left, - const name_component &right) - { - const char *left_qualified = this->symbol_name_at (left.idx); - const char *right_qualified = this->symbol_name_at (right.idx); - - const char *left_name = left_qualified + left.name_offset; - const char *right_name = right_qualified + right.name_offset; - - return name_cmp (left_name, right_name) < 0; - }; - - std::sort (this->name_components.begin (), - this->name_components.end (), - name_comp_compare); -} - -/* Helper for dw2_expand_symtabs_matching that works with a - mapped_index_base instead of the containing objfile. This is split - to a separate function in order to be able to unit test the - name_components matching using a mock mapped_index_base. For each - symbol name that matches, calls MATCH_CALLBACK, passing it the - symbol's index in the mapped_index_base symbol table. */ - -static void -dw2_expand_symtabs_matching_symbol - (mapped_index_base &index, - const lookup_name_info &lookup_name_in, - gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher, - enum search_domain kind, - gdb::function_view<bool (offset_type)> match_callback) -{ - lookup_name_info lookup_name_without_params - = lookup_name_in.make_ignore_params (); - - /* Build the symbol name component sorted vector, if we haven't - yet. */ - index.build_name_components (); - - /* The same symbol may appear more than once in the range though. - E.g., if we're looking for symbols that complete "w", and we have - a symbol named "w1::w2", we'll find the two name components for - that same symbol in the range. To be sure we only call the - callback once per symbol, we first collect the symbol name - indexes that matched in a temporary vector and ignore - duplicates. */ - std::vector<offset_type> matches; - - struct name_and_matcher - { - symbol_name_matcher_ftype *matcher; - const std::string &name; - - bool operator== (const name_and_matcher &other) const - { - return matcher == other.matcher && name == other.name; - } - }; - - /* A vector holding all the different symbol name matchers, for all - languages. */ - std::vector<name_and_matcher> matchers; - - for (int i = 0; i < nr_languages; i++) - { - enum language lang_e = (enum language) i; - - const language_defn *lang = language_def (lang_e); - symbol_name_matcher_ftype *name_matcher - = get_symbol_name_matcher (lang, lookup_name_without_params); - - name_and_matcher key { - name_matcher, - lookup_name_without_params.language_lookup_name (lang_e) - }; - - /* Don't insert the same comparison routine more than once. - Note that we do this linear walk. This is not a problem in - practice because the number of supported languages is - low. */ - if (std::find (matchers.begin (), matchers.end (), key) - != matchers.end ()) - continue; - matchers.push_back (std::move (key)); - - auto bounds - = index.find_name_components_bounds (lookup_name_without_params, - lang_e); - - /* Now for each symbol name in range, check to see if we have a name - match, and if so, call the MATCH_CALLBACK callback. */ - - for (; bounds.first != bounds.second; ++bounds.first) - { - const char *qualified = index.symbol_name_at (bounds.first->idx); - - if (!name_matcher (qualified, lookup_name_without_params, NULL) - || (symbol_matcher != NULL && !symbol_matcher (qualified))) - continue; - - matches.push_back (bounds.first->idx); - } - } - - std::sort (matches.begin (), matches.end ()); - - /* Finally call the callback, once per match. */ - ULONGEST prev = -1; - for (offset_type idx : matches) - { - if (prev != idx) - { - if (!match_callback (idx)) - break; - prev = idx; - } - } - - /* Above we use a type wider than idx's for 'prev', since 0 and - (offset_type)-1 are both possible values. */ - static_assert (sizeof (prev) > sizeof (offset_type), ""); -} - -#if GDB_SELF_TEST - -namespace selftests { namespace dw2_expand_symtabs_matching { - -/* A mock .gdb_index/.debug_names-like name index table, enough to - exercise dw2_expand_symtabs_matching_symbol, which works with the - mapped_index_base interface. Builds an index from the symbol list - passed as parameter to the constructor. */ -class mock_mapped_index : public mapped_index_base -{ -public: - mock_mapped_index (gdb::array_view<const char *> symbols) - : m_symbol_table (symbols) - {} - - DISABLE_COPY_AND_ASSIGN (mock_mapped_index); - - /* Return the number of names in the symbol table. */ - size_t symbol_name_count () const override - { - return m_symbol_table.size (); - } - - /* Get the name of the symbol at IDX in the symbol table. */ - const char *symbol_name_at (offset_type idx) const override - { - return m_symbol_table[idx]; - } - -private: - gdb::array_view<const char *> m_symbol_table; -}; - -/* Convenience function that converts a NULL pointer to a "<null>" - string, to pass to print routines. */ - -static const char * -string_or_null (const char *str) -{ - return str != NULL ? str : "<null>"; -} - -/* Check if a lookup_name_info built from - NAME/MATCH_TYPE/COMPLETION_MODE matches the symbols in the mock - index. EXPECTED_LIST is the list of expected matches, in expected - matching order. If no match expected, then an empty list is - specified. Returns true on success. On failure prints a warning - indicating the file:line that failed, and returns false. */ - -static bool -check_match (const char *file, int line, - mock_mapped_index &mock_index, - const char *name, symbol_name_match_type match_type, - bool completion_mode, - std::initializer_list<const char *> expected_list) -{ - lookup_name_info lookup_name (name, match_type, completion_mode); - - bool matched = true; - - auto mismatch = [&] (const char *expected_str, - const char *got) - { - warning (_("%s:%d: match_type=%s, looking-for=\"%s\", " - "expected=\"%s\", got=\"%s\"\n"), - file, line, - (match_type == symbol_name_match_type::FULL - ? "FULL" : "WILD"), - name, string_or_null (expected_str), string_or_null (got)); - matched = false; - }; - - auto expected_it = expected_list.begin (); - auto expected_end = expected_list.end (); - - dw2_expand_symtabs_matching_symbol (mock_index, lookup_name, - NULL, ALL_DOMAIN, - [&] (offset_type idx) - { - const char *matched_name = mock_index.symbol_name_at (idx); - const char *expected_str - = expected_it == expected_end ? NULL : *expected_it++; - - if (expected_str == NULL || strcmp (expected_str, matched_name) != 0) - mismatch (expected_str, matched_name); - return true; - }); - - const char *expected_str - = expected_it == expected_end ? NULL : *expected_it++; - if (expected_str != NULL) - mismatch (expected_str, NULL); - - return matched; -} - -/* The symbols added to the mock mapped_index for testing (in - canonical form). */ -static const char *test_symbols[] = { - "function", - "std::bar", - "std::zfunction", - "std::zfunction2", - "w1::w2", - "ns::foo<char*>", - "ns::foo<int>", - "ns::foo<long>", - "ns2::tmpl<int>::foo2", - "(anonymous namespace)::A::B::C", - - /* These are used to check that the increment-last-char in the - matching algorithm for completion doesn't match "t1_fund" when - completing "t1_func". */ - "t1_func", - "t1_func1", - "t1_fund", - "t1_fund1", - - /* A UTF-8 name with multi-byte sequences to make sure that - cp-name-parser understands this as a single identifier ("função" - is "function" in PT). */ - u8"u8função", - - /* \377 (0xff) is Latin1 'ÿ'. */ - "yfunc\377", - - /* \377 (0xff) is Latin1 'ÿ'. */ - "\377", - "\377\377123", - - /* A name with all sorts of complications. Starts with "z" to make - it easier for the completion tests below. */ -#define Z_SYM_NAME \ - "z::std::tuple<(anonymous namespace)::ui*, std::bar<(anonymous namespace)::ui> >" \ - "::tuple<(anonymous namespace)::ui*, " \ - "std::default_delete<(anonymous namespace)::ui>, void>" - - Z_SYM_NAME -}; - -/* Returns true if the mapped_index_base::find_name_component_bounds - method finds EXPECTED_SYMS in INDEX when looking for SEARCH_NAME, - in completion mode. */ - -static bool -check_find_bounds_finds (mapped_index_base &index, - const char *search_name, - gdb::array_view<const char *> expected_syms) -{ - lookup_name_info lookup_name (search_name, - symbol_name_match_type::FULL, true); - - auto bounds = index.find_name_components_bounds (lookup_name, - language_cplus); - - size_t distance = std::distance (bounds.first, bounds.second); - if (distance != expected_syms.size ()) - return false; - - for (size_t exp_elem = 0; exp_elem < distance; exp_elem++) - { - auto nc_elem = bounds.first + exp_elem; - const char *qualified = index.symbol_name_at (nc_elem->idx); - if (strcmp (qualified, expected_syms[exp_elem]) != 0) - return false; - } - - return true; -} - -/* Test the lower-level mapped_index::find_name_component_bounds - method. */ - -static void -test_mapped_index_find_name_component_bounds () -{ - mock_mapped_index mock_index (test_symbols); - - mock_index.build_name_components (); - - /* Test the lower-level mapped_index::find_name_component_bounds - method in completion mode. */ - { - static const char *expected_syms[] = { - "t1_func", - "t1_func1", - }; - - SELF_CHECK (check_find_bounds_finds (mock_index, - "t1_func", expected_syms)); - } - - /* Check that the increment-last-char in the name matching algorithm - for completion doesn't get confused with Ansi1 'ÿ' / 0xff. */ - { - static const char *expected_syms1[] = { - "\377", - "\377\377123", - }; - SELF_CHECK (check_find_bounds_finds (mock_index, - "\377", expected_syms1)); - - static const char *expected_syms2[] = { - "\377\377123", - }; - SELF_CHECK (check_find_bounds_finds (mock_index, - "\377\377", expected_syms2)); - } -} - -/* Test dw2_expand_symtabs_matching_symbol. */ - -static void -test_dw2_expand_symtabs_matching_symbol () -{ - mock_mapped_index mock_index (test_symbols); - - /* We let all tests run until the end even if some fails, for debug - convenience. */ - bool any_mismatch = false; - - /* Create the expected symbols list (an initializer_list). Needed - because lists have commas, and we need to pass them to CHECK, - which is a macro. */ -#define EXPECT(...) { __VA_ARGS__ } - - /* Wrapper for check_match that passes down the current - __FILE__/__LINE__. */ -#define CHECK_MATCH(NAME, MATCH_TYPE, COMPLETION_MODE, EXPECTED_LIST) \ - any_mismatch |= !check_match (__FILE__, __LINE__, \ - mock_index, \ - NAME, MATCH_TYPE, COMPLETION_MODE, \ - EXPECTED_LIST) - - /* Identity checks. */ - for (const char *sym : test_symbols) - { - /* Should be able to match all existing symbols. */ - CHECK_MATCH (sym, symbol_name_match_type::FULL, false, - EXPECT (sym)); - - /* Should be able to match all existing symbols with - parameters. */ - std::string with_params = std::string (sym) + "(int)"; - CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false, - EXPECT (sym)); - - /* Should be able to match all existing symbols with - parameters and qualifiers. */ - with_params = std::string (sym) + " ( int ) const"; - CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false, - EXPECT (sym)); - - /* This should really find sym, but cp-name-parser.y doesn't - know about lvalue/rvalue qualifiers yet. */ - with_params = std::string (sym) + " ( int ) &&"; - CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false, - {}); - } - - /* Check that the name matching algorithm for completion doesn't get - confused with Latin1 'ÿ' / 0xff. */ - { - static const char str[] = "\377"; - CHECK_MATCH (str, symbol_name_match_type::FULL, true, - EXPECT ("\377", "\377\377123")); - } - - /* Check that the increment-last-char in the matching algorithm for - completion doesn't match "t1_fund" when completing "t1_func". */ - { - static const char str[] = "t1_func"; - CHECK_MATCH (str, symbol_name_match_type::FULL, true, - EXPECT ("t1_func", "t1_func1")); - } - - /* Check that completion mode works at each prefix of the expected - symbol name. */ - { - static const char str[] = "function(int)"; - size_t len = strlen (str); - std::string lookup; - - for (size_t i = 1; i < len; i++) - { - lookup.assign (str, i); - CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true, - EXPECT ("function")); - } - } - - /* While "w" is a prefix of both components, the match function - should still only be called once. */ - { - CHECK_MATCH ("w", symbol_name_match_type::FULL, true, - EXPECT ("w1::w2")); - CHECK_MATCH ("w", symbol_name_match_type::WILD, true, - EXPECT ("w1::w2")); - } - - /* Same, with a "complicated" symbol. */ - { - static const char str[] = Z_SYM_NAME; - size_t len = strlen (str); - std::string lookup; - - for (size_t i = 1; i < len; i++) - { - lookup.assign (str, i); - CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true, - EXPECT (Z_SYM_NAME)); - } - } - - /* In FULL mode, an incomplete symbol doesn't match. */ - { - CHECK_MATCH ("std::zfunction(int", symbol_name_match_type::FULL, false, - {}); - } - - /* A complete symbol with parameters matches any overload, since the - index has no overload info. */ - { - CHECK_MATCH ("std::zfunction(int)", symbol_name_match_type::FULL, true, - EXPECT ("std::zfunction", "std::zfunction2")); - CHECK_MATCH ("zfunction(int)", symbol_name_match_type::WILD, true, - EXPECT ("std::zfunction", "std::zfunction2")); - CHECK_MATCH ("zfunc", symbol_name_match_type::WILD, true, - EXPECT ("std::zfunction", "std::zfunction2")); - } - - /* Check that whitespace is ignored appropriately. A symbol with a - template argument list. */ - { - static const char expected[] = "ns::foo<int>"; - CHECK_MATCH ("ns :: foo < int > ", symbol_name_match_type::FULL, false, - EXPECT (expected)); - CHECK_MATCH ("foo < int > ", symbol_name_match_type::WILD, false, - EXPECT (expected)); - } - - /* Check that whitespace is ignored appropriately. A symbol with a - template argument list that includes a pointer. */ - { - static const char expected[] = "ns::foo<char*>"; - /* Try both completion and non-completion modes. */ - static const bool completion_mode[2] = {false, true}; - for (size_t i = 0; i < 2; i++) - { - CHECK_MATCH ("ns :: foo < char * >", symbol_name_match_type::FULL, - completion_mode[i], EXPECT (expected)); - CHECK_MATCH ("foo < char * >", symbol_name_match_type::WILD, - completion_mode[i], EXPECT (expected)); - - CHECK_MATCH ("ns :: foo < char * > (int)", symbol_name_match_type::FULL, - completion_mode[i], EXPECT (expected)); - CHECK_MATCH ("foo < char * > (int)", symbol_name_match_type::WILD, - completion_mode[i], EXPECT (expected)); - } - } - - { - /* Check method qualifiers are ignored. */ - static const char expected[] = "ns::foo<char*>"; - CHECK_MATCH ("ns :: foo < char * > ( int ) const", - symbol_name_match_type::FULL, true, EXPECT (expected)); - CHECK_MATCH ("ns :: foo < char * > ( int ) &&", - symbol_name_match_type::FULL, true, EXPECT (expected)); - CHECK_MATCH ("foo < char * > ( int ) const", - symbol_name_match_type::WILD, true, EXPECT (expected)); - CHECK_MATCH ("foo < char * > ( int ) &&", - symbol_name_match_type::WILD, true, EXPECT (expected)); - } - - /* Test lookup names that don't match anything. */ - { - CHECK_MATCH ("bar2", symbol_name_match_type::WILD, false, - {}); - - CHECK_MATCH ("doesntexist", symbol_name_match_type::FULL, false, - {}); - } - - /* Some wild matching tests, exercising "(anonymous namespace)", - which should not be confused with a parameter list. */ - { - static const char *syms[] = { - "A::B::C", - "B::C", - "C", - "A :: B :: C ( int )", - "B :: C ( int )", - "C ( int )", - }; - - for (const char *s : syms) - { - CHECK_MATCH (s, symbol_name_match_type::WILD, false, - EXPECT ("(anonymous namespace)::A::B::C")); - } - } - - { - static const char expected[] = "ns2::tmpl<int>::foo2"; - CHECK_MATCH ("tmp", symbol_name_match_type::WILD, true, - EXPECT (expected)); - CHECK_MATCH ("tmpl<", symbol_name_match_type::WILD, true, - EXPECT (expected)); - } - - SELF_CHECK (!any_mismatch); - -#undef EXPECT -#undef CHECK_MATCH -} - -static void -run_test () -{ - test_mapped_index_find_name_component_bounds (); - test_dw2_expand_symtabs_matching_symbol (); -} - -}} // namespace selftests::dw2_expand_symtabs_matching - -#endif /* GDB_SELF_TEST */ - -/* If FILE_MATCHER is NULL or if PER_CU has - dwarf2_per_cu_quick_data::MARK set (see - dw_expand_symtabs_matching_file_matcher), expand the CU and call - EXPANSION_NOTIFY on it. */ - -static void -dw2_expand_symtabs_matching_one - (struct dwarf2_per_cu_data *per_cu, - gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher, - gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify) -{ - if (file_matcher == NULL || per_cu->v.quick->mark) - { - bool symtab_was_null - = (per_cu->v.quick->compunit_symtab == NULL); - - dw2_instantiate_symtab (per_cu, false); - - if (expansion_notify != NULL - && symtab_was_null - && per_cu->v.quick->compunit_symtab != NULL) - expansion_notify (per_cu->v.quick->compunit_symtab); - } -} - -/* Helper for dw2_expand_matching symtabs. Called on each symbol - matched, to expand corresponding CUs that were marked. IDX is the - index of the symbol name that matched. */ - -static void -dw2_expand_marked_cus - (struct dwarf2_per_objfile *dwarf2_per_objfile, offset_type idx, - gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher, - gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify, - search_domain kind) -{ - offset_type *vec, vec_len, vec_idx; - bool global_seen = false; - mapped_index &index = *dwarf2_per_objfile->index_table; - - vec = (offset_type *) (index.constant_pool - + MAYBE_SWAP (index.symbol_table[idx].vec)); - vec_len = MAYBE_SWAP (vec[0]); - for (vec_idx = 0; vec_idx < vec_len; ++vec_idx) - { - offset_type cu_index_and_attrs = MAYBE_SWAP (vec[vec_idx + 1]); - /* This value is only valid for index versions >= 7. */ - int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs); - gdb_index_symbol_kind symbol_kind = - GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs); - int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs); - /* Only check the symbol attributes if they're present. - Indices prior to version 7 don't record them, - and indices >= 7 may elide them for certain symbols - (gold does this). */ - int attrs_valid = - (index.version >= 7 - && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE); - - /* Work around gold/15646. */ - if (attrs_valid) - { - if (!is_static && global_seen) - continue; - if (!is_static) - global_seen = true; - } - - /* Only check the symbol's kind if it has one. */ - if (attrs_valid) - { - switch (kind) - { - case VARIABLES_DOMAIN: - if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE) - continue; - break; - case FUNCTIONS_DOMAIN: - if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION) - continue; - break; - case TYPES_DOMAIN: - if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE) - continue; - break; - case MODULES_DOMAIN: - if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER) - continue; - break; - default: - break; - } - } - - /* Don't crash on bad data. */ - if (cu_index >= (dwarf2_per_objfile->all_comp_units.size () - + dwarf2_per_objfile->all_type_units.size ())) - { - complaint (_(".gdb_index entry has bad CU index" - " [in module %s]"), - objfile_name (dwarf2_per_objfile->objfile)); - continue; - } - - dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (cu_index); - dw2_expand_symtabs_matching_one (per_cu, file_matcher, - expansion_notify); - } -} - -/* If FILE_MATCHER is non-NULL, set all the - dwarf2_per_cu_quick_data::MARK of the current DWARF2_PER_OBJFILE - that match FILE_MATCHER. */ - -static void -dw_expand_symtabs_matching_file_matcher - (struct dwarf2_per_objfile *dwarf2_per_objfile, - gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher) -{ - if (file_matcher == NULL) - return; - - objfile *const objfile = dwarf2_per_objfile->objfile; - - htab_up visited_found (htab_create_alloc (10, htab_hash_pointer, - htab_eq_pointer, - NULL, xcalloc, xfree)); - htab_up visited_not_found (htab_create_alloc (10, htab_hash_pointer, - htab_eq_pointer, - NULL, xcalloc, xfree)); - - /* The rule is CUs specify all the files, including those used by - any TU, so there's no need to scan TUs here. */ - - for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units) - { - QUIT; - - per_cu->v.quick->mark = 0; - - /* We only need to look at symtabs not already expanded. */ - if (per_cu->v.quick->compunit_symtab) - continue; - - quick_file_names *file_data = dw2_get_file_names (per_cu); - if (file_data == NULL) - continue; - - if (htab_find (visited_not_found.get (), file_data) != NULL) - continue; - else if (htab_find (visited_found.get (), file_data) != NULL) - { - per_cu->v.quick->mark = 1; - continue; - } - - for (int j = 0; j < file_data->num_file_names; ++j) - { - const char *this_real_name; - - if (file_matcher (file_data->file_names[j], false)) - { - per_cu->v.quick->mark = 1; - break; - } - - /* Before we invoke realpath, which can get expensive when many - files are involved, do a quick comparison of the basenames. */ - if (!basenames_may_differ - && !file_matcher (lbasename (file_data->file_names[j]), - true)) - continue; - - this_real_name = dw2_get_real_path (objfile, file_data, j); - if (file_matcher (this_real_name, false)) - { - per_cu->v.quick->mark = 1; - break; - } - } - - void **slot = htab_find_slot (per_cu->v.quick->mark - ? visited_found.get () - : visited_not_found.get (), - file_data, INSERT); - *slot = file_data; - } -} - -static void -dw2_expand_symtabs_matching - (struct objfile *objfile, - gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher, - const lookup_name_info &lookup_name, - gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher, - gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify, - enum search_domain kind) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = get_dwarf2_per_objfile (objfile); - - /* index_table is NULL if OBJF_READNOW. */ - if (!dwarf2_per_objfile->index_table) - return; - - dw_expand_symtabs_matching_file_matcher (dwarf2_per_objfile, file_matcher); - - mapped_index &index = *dwarf2_per_objfile->index_table; - - dw2_expand_symtabs_matching_symbol (index, lookup_name, - symbol_matcher, - kind, [&] (offset_type idx) - { - dw2_expand_marked_cus (dwarf2_per_objfile, idx, file_matcher, - expansion_notify, kind); - return true; - }); -} - -/* A helper for dw2_find_pc_sect_compunit_symtab which finds the most specific - symtab. */ - -static struct compunit_symtab * -recursively_find_pc_sect_compunit_symtab (struct compunit_symtab *cust, - CORE_ADDR pc) -{ - int i; - - if (COMPUNIT_BLOCKVECTOR (cust) != NULL - && blockvector_contains_pc (COMPUNIT_BLOCKVECTOR (cust), pc)) - return cust; - - if (cust->includes == NULL) - return NULL; - - for (i = 0; cust->includes[i]; ++i) - { - struct compunit_symtab *s = cust->includes[i]; - - s = recursively_find_pc_sect_compunit_symtab (s, pc); - if (s != NULL) - return s; - } - - return NULL; -} - -static struct compunit_symtab * -dw2_find_pc_sect_compunit_symtab (struct objfile *objfile, - struct bound_minimal_symbol msymbol, - CORE_ADDR pc, - struct obj_section *section, - int warn_if_readin) -{ - struct dwarf2_per_cu_data *data; - struct compunit_symtab *result; - - if (!objfile->partial_symtabs->psymtabs_addrmap) - return NULL; - - CORE_ADDR baseaddr = objfile->text_section_offset (); - data = (struct dwarf2_per_cu_data *) addrmap_find - (objfile->partial_symtabs->psymtabs_addrmap, pc - baseaddr); - if (!data) - return NULL; - - if (warn_if_readin && data->v.quick->compunit_symtab) - warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"), - paddress (get_objfile_arch (objfile), pc)); - - result - = recursively_find_pc_sect_compunit_symtab (dw2_instantiate_symtab (data, - false), - pc); - gdb_assert (result != NULL); - return result; -} - -static void -dw2_map_symbol_filenames (struct objfile *objfile, symbol_filename_ftype *fun, - void *data, int need_fullname) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = get_dwarf2_per_objfile (objfile); - - if (!dwarf2_per_objfile->filenames_cache) - { - dwarf2_per_objfile->filenames_cache.emplace (); - - htab_up visited (htab_create_alloc (10, - htab_hash_pointer, htab_eq_pointer, - NULL, xcalloc, xfree)); - - /* The rule is CUs specify all the files, including those used - by any TU, so there's no need to scan TUs here. We can - ignore file names coming from already-expanded CUs. */ - - for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units) - { - if (per_cu->v.quick->compunit_symtab) - { - void **slot = htab_find_slot (visited.get (), - per_cu->v.quick->file_names, - INSERT); - - *slot = per_cu->v.quick->file_names; - } - } - - for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units) - { - /* We only need to look at symtabs not already expanded. */ - if (per_cu->v.quick->compunit_symtab) - continue; - - quick_file_names *file_data = dw2_get_file_names (per_cu); - if (file_data == NULL) - continue; - - void **slot = htab_find_slot (visited.get (), file_data, INSERT); - if (*slot) - { - /* Already visited. */ - continue; - } - *slot = file_data; - - for (int j = 0; j < file_data->num_file_names; ++j) - { - const char *filename = file_data->file_names[j]; - dwarf2_per_objfile->filenames_cache->seen (filename); - } - } - } - - dwarf2_per_objfile->filenames_cache->traverse ([&] (const char *filename) - { - gdb::unique_xmalloc_ptr<char> this_real_name; - - if (need_fullname) - this_real_name = gdb_realpath (filename); - (*fun) (filename, this_real_name.get (), data); - }); -} - -static int -dw2_has_symbols (struct objfile *objfile) -{ - return 1; -} - -const struct quick_symbol_functions dwarf2_gdb_index_functions = -{ - dw2_has_symbols, - dw2_find_last_source_symtab, - dw2_forget_cached_source_info, - dw2_map_symtabs_matching_filename, - dw2_lookup_symbol, - dw2_print_stats, - dw2_dump, - dw2_expand_symtabs_for_function, - dw2_expand_all_symtabs, - dw2_expand_symtabs_with_fullname, - dw2_map_matching_symbols, - dw2_expand_symtabs_matching, - dw2_find_pc_sect_compunit_symtab, - NULL, - dw2_map_symbol_filenames -}; - -/* DWARF-5 debug_names reader. */ - -/* DWARF-5 augmentation string for GDB's DW_IDX_GNU_* extension. */ -static const gdb_byte dwarf5_augmentation[] = { 'G', 'D', 'B', 0 }; - -/* A helper function that reads the .debug_names section in SECTION - and fills in MAP. FILENAME is the name of the file containing the - section; it is used for error reporting. - - Returns true if all went well, false otherwise. */ - -static bool -read_debug_names_from_section (struct objfile *objfile, - const char *filename, - struct dwarf2_section_info *section, - mapped_debug_names &map) -{ - if (section->empty ()) - return false; - - /* Older elfutils strip versions could keep the section in the main - executable while splitting it for the separate debug info file. */ - if ((section->get_flags () & SEC_HAS_CONTENTS) == 0) - return false; - - section->read (objfile); - - map.dwarf5_byte_order = gdbarch_byte_order (get_objfile_arch (objfile)); - - const gdb_byte *addr = section->buffer; - - bfd *const abfd = section->get_bfd_owner (); - - unsigned int bytes_read; - LONGEST length = read_initial_length (abfd, addr, &bytes_read); - addr += bytes_read; - - map.dwarf5_is_dwarf64 = bytes_read != 4; - map.offset_size = map.dwarf5_is_dwarf64 ? 8 : 4; - if (bytes_read + length != section->size) - { - /* There may be multiple per-CU indices. */ - warning (_("Section .debug_names in %s length %s does not match " - "section length %s, ignoring .debug_names."), - filename, plongest (bytes_read + length), - pulongest (section->size)); - return false; - } - - /* The version number. */ - uint16_t version = read_2_bytes (abfd, addr); - addr += 2; - if (version != 5) - { - warning (_("Section .debug_names in %s has unsupported version %d, " - "ignoring .debug_names."), - filename, version); - return false; - } - - /* Padding. */ - uint16_t padding = read_2_bytes (abfd, addr); - addr += 2; - if (padding != 0) - { - warning (_("Section .debug_names in %s has unsupported padding %d, " - "ignoring .debug_names."), - filename, padding); - return false; - } - - /* comp_unit_count - The number of CUs in the CU list. */ - map.cu_count = read_4_bytes (abfd, addr); - addr += 4; - - /* local_type_unit_count - The number of TUs in the local TU - list. */ - map.tu_count = read_4_bytes (abfd, addr); - addr += 4; - - /* foreign_type_unit_count - The number of TUs in the foreign TU - list. */ - uint32_t foreign_tu_count = read_4_bytes (abfd, addr); - addr += 4; - if (foreign_tu_count != 0) - { - warning (_("Section .debug_names in %s has unsupported %lu foreign TUs, " - "ignoring .debug_names."), - filename, static_cast<unsigned long> (foreign_tu_count)); - return false; - } - - /* bucket_count - The number of hash buckets in the hash lookup - table. */ - map.bucket_count = read_4_bytes (abfd, addr); - addr += 4; - - /* name_count - The number of unique names in the index. */ - map.name_count = read_4_bytes (abfd, addr); - addr += 4; - - /* abbrev_table_size - The size in bytes of the abbreviations - table. */ - uint32_t abbrev_table_size = read_4_bytes (abfd, addr); - addr += 4; - - /* augmentation_string_size - The size in bytes of the augmentation - string. This value is rounded up to a multiple of 4. */ - uint32_t augmentation_string_size = read_4_bytes (abfd, addr); - addr += 4; - map.augmentation_is_gdb = ((augmentation_string_size - == sizeof (dwarf5_augmentation)) - && memcmp (addr, dwarf5_augmentation, - sizeof (dwarf5_augmentation)) == 0); - augmentation_string_size += (-augmentation_string_size) & 3; - addr += augmentation_string_size; - - /* List of CUs */ - map.cu_table_reordered = addr; - addr += map.cu_count * map.offset_size; - - /* List of Local TUs */ - map.tu_table_reordered = addr; - addr += map.tu_count * map.offset_size; - - /* Hash Lookup Table */ - map.bucket_table_reordered = reinterpret_cast<const uint32_t *> (addr); - addr += map.bucket_count * 4; - map.hash_table_reordered = reinterpret_cast<const uint32_t *> (addr); - addr += map.name_count * 4; - - /* Name Table */ - map.name_table_string_offs_reordered = addr; - addr += map.name_count * map.offset_size; - map.name_table_entry_offs_reordered = addr; - addr += map.name_count * map.offset_size; - - const gdb_byte *abbrev_table_start = addr; - for (;;) - { - const ULONGEST index_num = read_unsigned_leb128 (abfd, addr, &bytes_read); - addr += bytes_read; - if (index_num == 0) - break; - - const auto insertpair - = map.abbrev_map.emplace (index_num, mapped_debug_names::index_val ()); - if (!insertpair.second) - { - warning (_("Section .debug_names in %s has duplicate index %s, " - "ignoring .debug_names."), - filename, pulongest (index_num)); - return false; - } - mapped_debug_names::index_val &indexval = insertpair.first->second; - indexval.dwarf_tag = read_unsigned_leb128 (abfd, addr, &bytes_read); - addr += bytes_read; - - for (;;) - { - mapped_debug_names::index_val::attr attr; - attr.dw_idx = read_unsigned_leb128 (abfd, addr, &bytes_read); - addr += bytes_read; - attr.form = read_unsigned_leb128 (abfd, addr, &bytes_read); - addr += bytes_read; - if (attr.form == DW_FORM_implicit_const) - { - attr.implicit_const = read_signed_leb128 (abfd, addr, - &bytes_read); - addr += bytes_read; - } - if (attr.dw_idx == 0 && attr.form == 0) - break; - indexval.attr_vec.push_back (std::move (attr)); - } - } - if (addr != abbrev_table_start + abbrev_table_size) - { - warning (_("Section .debug_names in %s has abbreviation_table " - "of size %s vs. written as %u, ignoring .debug_names."), - filename, plongest (addr - abbrev_table_start), - abbrev_table_size); - return false; - } - map.entry_pool = addr; - - return true; -} - -/* A helper for create_cus_from_debug_names that handles the MAP's CU - list. */ - -static void -create_cus_from_debug_names_list (struct dwarf2_per_objfile *dwarf2_per_objfile, - const mapped_debug_names &map, - dwarf2_section_info §ion, - bool is_dwz) -{ - sect_offset sect_off_prev; - for (uint32_t i = 0; i <= map.cu_count; ++i) - { - sect_offset sect_off_next; - if (i < map.cu_count) - { - sect_off_next - = (sect_offset) (extract_unsigned_integer - (map.cu_table_reordered + i * map.offset_size, - map.offset_size, - map.dwarf5_byte_order)); - } - else - sect_off_next = (sect_offset) section.size; - if (i >= 1) - { - const ULONGEST length = sect_off_next - sect_off_prev; - dwarf2_per_cu_data *per_cu - = create_cu_from_index_list (dwarf2_per_objfile, §ion, is_dwz, - sect_off_prev, length); - dwarf2_per_objfile->all_comp_units.push_back (per_cu); - } - sect_off_prev = sect_off_next; - } -} - -/* Read the CU list from the mapped index, and use it to create all - the CU objects for this dwarf2_per_objfile. */ - -static void -create_cus_from_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile, - const mapped_debug_names &map, - const mapped_debug_names &dwz_map) -{ - gdb_assert (dwarf2_per_objfile->all_comp_units.empty ()); - dwarf2_per_objfile->all_comp_units.reserve (map.cu_count + dwz_map.cu_count); - - create_cus_from_debug_names_list (dwarf2_per_objfile, map, - dwarf2_per_objfile->info, - false /* is_dwz */); - - if (dwz_map.cu_count == 0) - return; - - dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile); - create_cus_from_debug_names_list (dwarf2_per_objfile, dwz_map, dwz->info, - true /* is_dwz */); -} - -/* Read .debug_names. If everything went ok, initialize the "quick" - elements of all the CUs and return true. Otherwise, return false. */ - -static bool -dwarf2_read_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile) -{ - std::unique_ptr<mapped_debug_names> map - (new mapped_debug_names (dwarf2_per_objfile)); - mapped_debug_names dwz_map (dwarf2_per_objfile); - struct objfile *objfile = dwarf2_per_objfile->objfile; - - if (!read_debug_names_from_section (objfile, objfile_name (objfile), - &dwarf2_per_objfile->debug_names, - *map)) - return false; - - /* Don't use the index if it's empty. */ - if (map->name_count == 0) - return false; - - /* If there is a .dwz file, read it so we can get its CU list as - well. */ - dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile); - if (dwz != NULL) - { - if (!read_debug_names_from_section (objfile, - bfd_get_filename (dwz->dwz_bfd.get ()), - &dwz->debug_names, dwz_map)) - { - warning (_("could not read '.debug_names' section from %s; skipping"), - bfd_get_filename (dwz->dwz_bfd.get ())); - return false; - } - } - - create_cus_from_debug_names (dwarf2_per_objfile, *map, dwz_map); - - if (map->tu_count != 0) - { - /* We can only handle a single .debug_types when we have an - index. */ - if (dwarf2_per_objfile->types.size () != 1) - return false; - - dwarf2_section_info *section = &dwarf2_per_objfile->types[0]; - - create_signatured_type_table_from_debug_names - (dwarf2_per_objfile, *map, section, &dwarf2_per_objfile->abbrev); - } - - create_addrmap_from_aranges (dwarf2_per_objfile, - &dwarf2_per_objfile->debug_aranges); - - dwarf2_per_objfile->debug_names_table = std::move (map); - dwarf2_per_objfile->using_index = 1; - dwarf2_per_objfile->quick_file_names_table = - create_quick_file_names_table (dwarf2_per_objfile->all_comp_units.size ()); - - return true; -} - -/* Type used to manage iterating over all CUs looking for a symbol for - .debug_names. */ - -class dw2_debug_names_iterator -{ -public: - dw2_debug_names_iterator (const mapped_debug_names &map, - gdb::optional<block_enum> block_index, - domain_enum domain, - const char *name) - : m_map (map), m_block_index (block_index), m_domain (domain), - m_addr (find_vec_in_debug_names (map, name)) - {} - - dw2_debug_names_iterator (const mapped_debug_names &map, - search_domain search, uint32_t namei) - : m_map (map), - m_search (search), - m_addr (find_vec_in_debug_names (map, namei)) - {} - - dw2_debug_names_iterator (const mapped_debug_names &map, - block_enum block_index, domain_enum domain, - uint32_t namei) - : m_map (map), m_block_index (block_index), m_domain (domain), - m_addr (find_vec_in_debug_names (map, namei)) - {} - - /* Return the next matching CU or NULL if there are no more. */ - dwarf2_per_cu_data *next (); - -private: - static const gdb_byte *find_vec_in_debug_names (const mapped_debug_names &map, - const char *name); - static const gdb_byte *find_vec_in_debug_names (const mapped_debug_names &map, - uint32_t namei); - - /* The internalized form of .debug_names. */ - const mapped_debug_names &m_map; - - /* If set, only look for symbols that match that block. Valid values are - GLOBAL_BLOCK and STATIC_BLOCK. */ - const gdb::optional<block_enum> m_block_index; - - /* The kind of symbol we're looking for. */ - const domain_enum m_domain = UNDEF_DOMAIN; - const search_domain m_search = ALL_DOMAIN; - - /* The list of CUs from the index entry of the symbol, or NULL if - not found. */ - const gdb_byte *m_addr; -}; - -const char * -mapped_debug_names::namei_to_name (uint32_t namei) const -{ - const ULONGEST namei_string_offs - = extract_unsigned_integer ((name_table_string_offs_reordered - + namei * offset_size), - offset_size, - dwarf5_byte_order); - return read_indirect_string_at_offset - (dwarf2_per_objfile, dwarf2_per_objfile->objfile->obfd, namei_string_offs); -} - -/* Find a slot in .debug_names for the object named NAME. If NAME is - found, return pointer to its pool data. If NAME cannot be found, - return NULL. */ - -const gdb_byte * -dw2_debug_names_iterator::find_vec_in_debug_names - (const mapped_debug_names &map, const char *name) -{ - int (*cmp) (const char *, const char *); - - gdb::unique_xmalloc_ptr<char> without_params; - if (current_language->la_language == language_cplus - || current_language->la_language == language_fortran - || current_language->la_language == language_d) - { - /* NAME is already canonical. Drop any qualifiers as - .debug_names does not contain any. */ - - if (strchr (name, '(') != NULL) - { - without_params = cp_remove_params (name); - if (without_params != NULL) - name = without_params.get (); - } - } - - cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp); - - const uint32_t full_hash = dwarf5_djb_hash (name); - uint32_t namei - = extract_unsigned_integer (reinterpret_cast<const gdb_byte *> - (map.bucket_table_reordered - + (full_hash % map.bucket_count)), 4, - map.dwarf5_byte_order); - if (namei == 0) - return NULL; - --namei; - if (namei >= map.name_count) - { - complaint (_("Wrong .debug_names with name index %u but name_count=%u " - "[in module %s]"), - namei, map.name_count, - objfile_name (map.dwarf2_per_objfile->objfile)); - return NULL; - } - - for (;;) - { - const uint32_t namei_full_hash - = extract_unsigned_integer (reinterpret_cast<const gdb_byte *> - (map.hash_table_reordered + namei), 4, - map.dwarf5_byte_order); - if (full_hash % map.bucket_count != namei_full_hash % map.bucket_count) - return NULL; - - if (full_hash == namei_full_hash) - { - const char *const namei_string = map.namei_to_name (namei); - -#if 0 /* An expensive sanity check. */ - if (namei_full_hash != dwarf5_djb_hash (namei_string)) - { - complaint (_("Wrong .debug_names hash for string at index %u " - "[in module %s]"), - namei, objfile_name (dwarf2_per_objfile->objfile)); - return NULL; - } -#endif - - if (cmp (namei_string, name) == 0) - { - const ULONGEST namei_entry_offs - = extract_unsigned_integer ((map.name_table_entry_offs_reordered - + namei * map.offset_size), - map.offset_size, map.dwarf5_byte_order); - return map.entry_pool + namei_entry_offs; - } - } - - ++namei; - if (namei >= map.name_count) - return NULL; - } -} - -const gdb_byte * -dw2_debug_names_iterator::find_vec_in_debug_names - (const mapped_debug_names &map, uint32_t namei) -{ - if (namei >= map.name_count) - { - complaint (_("Wrong .debug_names with name index %u but name_count=%u " - "[in module %s]"), - namei, map.name_count, - objfile_name (map.dwarf2_per_objfile->objfile)); - return NULL; - } - - const ULONGEST namei_entry_offs - = extract_unsigned_integer ((map.name_table_entry_offs_reordered - + namei * map.offset_size), - map.offset_size, map.dwarf5_byte_order); - return map.entry_pool + namei_entry_offs; -} - -/* See dw2_debug_names_iterator. */ - -dwarf2_per_cu_data * -dw2_debug_names_iterator::next () -{ - if (m_addr == NULL) - return NULL; - - struct dwarf2_per_objfile *dwarf2_per_objfile = m_map.dwarf2_per_objfile; - struct objfile *objfile = dwarf2_per_objfile->objfile; - bfd *const abfd = objfile->obfd; - - again: - - unsigned int bytes_read; - const ULONGEST abbrev = read_unsigned_leb128 (abfd, m_addr, &bytes_read); - m_addr += bytes_read; - if (abbrev == 0) - return NULL; - - const auto indexval_it = m_map.abbrev_map.find (abbrev); - if (indexval_it == m_map.abbrev_map.cend ()) - { - complaint (_("Wrong .debug_names undefined abbrev code %s " - "[in module %s]"), - pulongest (abbrev), objfile_name (objfile)); - return NULL; - } - const mapped_debug_names::index_val &indexval = indexval_it->second; - enum class symbol_linkage { - unknown, - static_, - extern_, - } symbol_linkage_ = symbol_linkage::unknown; - dwarf2_per_cu_data *per_cu = NULL; - for (const mapped_debug_names::index_val::attr &attr : indexval.attr_vec) - { - ULONGEST ull; - switch (attr.form) - { - case DW_FORM_implicit_const: - ull = attr.implicit_const; - break; - case DW_FORM_flag_present: - ull = 1; - break; - case DW_FORM_udata: - ull = read_unsigned_leb128 (abfd, m_addr, &bytes_read); - m_addr += bytes_read; - break; - default: - complaint (_("Unsupported .debug_names form %s [in module %s]"), - dwarf_form_name (attr.form), - objfile_name (objfile)); - return NULL; - } - switch (attr.dw_idx) - { - case DW_IDX_compile_unit: - /* Don't crash on bad data. */ - if (ull >= dwarf2_per_objfile->all_comp_units.size ()) - { - complaint (_(".debug_names entry has bad CU index %s" - " [in module %s]"), - pulongest (ull), - objfile_name (dwarf2_per_objfile->objfile)); - continue; - } - per_cu = dwarf2_per_objfile->get_cutu (ull); - break; - case DW_IDX_type_unit: - /* Don't crash on bad data. */ - if (ull >= dwarf2_per_objfile->all_type_units.size ()) - { - complaint (_(".debug_names entry has bad TU index %s" - " [in module %s]"), - pulongest (ull), - objfile_name (dwarf2_per_objfile->objfile)); - continue; - } - per_cu = &dwarf2_per_objfile->get_tu (ull)->per_cu; - break; - case DW_IDX_GNU_internal: - if (!m_map.augmentation_is_gdb) - break; - symbol_linkage_ = symbol_linkage::static_; - break; - case DW_IDX_GNU_external: - if (!m_map.augmentation_is_gdb) - break; - symbol_linkage_ = symbol_linkage::extern_; - break; - } - } - - /* Skip if already read in. */ - if (per_cu->v.quick->compunit_symtab) - goto again; - - /* Check static vs global. */ - if (symbol_linkage_ != symbol_linkage::unknown && m_block_index.has_value ()) - { - const bool want_static = *m_block_index == STATIC_BLOCK; - const bool symbol_is_static = - symbol_linkage_ == symbol_linkage::static_; - if (want_static != symbol_is_static) - goto again; - } - - /* Match dw2_symtab_iter_next, symbol_kind - and debug_names::psymbol_tag. */ - switch (m_domain) - { - case VAR_DOMAIN: - switch (indexval.dwarf_tag) - { - case DW_TAG_variable: - case DW_TAG_subprogram: - /* Some types are also in VAR_DOMAIN. */ - case DW_TAG_typedef: - case DW_TAG_structure_type: - break; - default: - goto again; - } - break; - case STRUCT_DOMAIN: - switch (indexval.dwarf_tag) - { - case DW_TAG_typedef: - case DW_TAG_structure_type: - break; - default: - goto again; - } - break; - case LABEL_DOMAIN: - switch (indexval.dwarf_tag) - { - case 0: - case DW_TAG_variable: - break; - default: - goto again; - } - break; - case MODULE_DOMAIN: - switch (indexval.dwarf_tag) - { - case DW_TAG_module: - break; - default: - goto again; - } - break; - default: - break; - } - - /* Match dw2_expand_symtabs_matching, symbol_kind and - debug_names::psymbol_tag. */ - switch (m_search) - { - case VARIABLES_DOMAIN: - switch (indexval.dwarf_tag) - { - case DW_TAG_variable: - break; - default: - goto again; - } - break; - case FUNCTIONS_DOMAIN: - switch (indexval.dwarf_tag) - { - case DW_TAG_subprogram: - break; - default: - goto again; - } - break; - case TYPES_DOMAIN: - switch (indexval.dwarf_tag) - { - case DW_TAG_typedef: - case DW_TAG_structure_type: - break; - default: - goto again; - } - break; - case MODULES_DOMAIN: - switch (indexval.dwarf_tag) - { - case DW_TAG_module: - break; - default: - goto again; - } - default: - break; - } - - return per_cu; -} - -static struct compunit_symtab * -dw2_debug_names_lookup_symbol (struct objfile *objfile, block_enum block_index, - const char *name, domain_enum domain) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = get_dwarf2_per_objfile (objfile); - - const auto &mapp = dwarf2_per_objfile->debug_names_table; - if (!mapp) - { - /* index is NULL if OBJF_READNOW. */ - return NULL; - } - const auto &map = *mapp; - - dw2_debug_names_iterator iter (map, block_index, domain, name); - - struct compunit_symtab *stab_best = NULL; - struct dwarf2_per_cu_data *per_cu; - while ((per_cu = iter.next ()) != NULL) - { - struct symbol *sym, *with_opaque = NULL; - struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu, false); - const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab); - const struct block *block = BLOCKVECTOR_BLOCK (bv, block_index); - - sym = block_find_symbol (block, name, domain, - block_find_non_opaque_type_preferred, - &with_opaque); - - /* Some caution must be observed with overloaded functions and - methods, since the index will not contain any overload - information (but NAME might contain it). */ - - if (sym != NULL - && strcmp_iw (sym->search_name (), name) == 0) - return stab; - if (with_opaque != NULL - && strcmp_iw (with_opaque->search_name (), name) == 0) - stab_best = stab; - - /* Keep looking through other CUs. */ - } - - return stab_best; -} - -/* This dumps minimal information about .debug_names. It is called - via "mt print objfiles". The gdb.dwarf2/gdb-index.exp testcase - uses this to verify that .debug_names has been loaded. */ - -static void -dw2_debug_names_dump (struct objfile *objfile) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = get_dwarf2_per_objfile (objfile); - - gdb_assert (dwarf2_per_objfile->using_index); - printf_filtered (".debug_names:"); - if (dwarf2_per_objfile->debug_names_table) - printf_filtered (" exists\n"); - else - printf_filtered (" faked for \"readnow\"\n"); - printf_filtered ("\n"); -} - -static void -dw2_debug_names_expand_symtabs_for_function (struct objfile *objfile, - const char *func_name) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = get_dwarf2_per_objfile (objfile); - - /* dwarf2_per_objfile->debug_names_table is NULL if OBJF_READNOW. */ - if (dwarf2_per_objfile->debug_names_table) - { - const mapped_debug_names &map = *dwarf2_per_objfile->debug_names_table; - - dw2_debug_names_iterator iter (map, {}, VAR_DOMAIN, func_name); - - struct dwarf2_per_cu_data *per_cu; - while ((per_cu = iter.next ()) != NULL) - dw2_instantiate_symtab (per_cu, false); - } -} - -static void -dw2_debug_names_map_matching_symbols - (struct objfile *objfile, - const lookup_name_info &name, domain_enum domain, - int global, - gdb::function_view<symbol_found_callback_ftype> callback, - symbol_compare_ftype *ordered_compare) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = get_dwarf2_per_objfile (objfile); - - /* debug_names_table is NULL if OBJF_READNOW. */ - if (!dwarf2_per_objfile->debug_names_table) - return; - - mapped_debug_names &map = *dwarf2_per_objfile->debug_names_table; - const block_enum block_kind = global ? GLOBAL_BLOCK : STATIC_BLOCK; - - const char *match_name = name.ada ().lookup_name ().c_str (); - auto matcher = [&] (const char *symname) - { - if (ordered_compare == nullptr) - return true; - return ordered_compare (symname, match_name) == 0; - }; - - dw2_expand_symtabs_matching_symbol (map, name, matcher, ALL_DOMAIN, - [&] (offset_type namei) - { - /* The name was matched, now expand corresponding CUs that were - marked. */ - dw2_debug_names_iterator iter (map, block_kind, domain, namei); - - struct dwarf2_per_cu_data *per_cu; - while ((per_cu = iter.next ()) != NULL) - dw2_expand_symtabs_matching_one (per_cu, nullptr, nullptr); - return true; - }); - - /* It's a shame we couldn't do this inside the - dw2_expand_symtabs_matching_symbol callback, but that skips CUs - that have already been expanded. Instead, this loop matches what - the psymtab code does. */ - for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units) - { - struct compunit_symtab *cust = per_cu->v.quick->compunit_symtab; - if (cust != nullptr) - { - const struct block *block - = BLOCKVECTOR_BLOCK (COMPUNIT_BLOCKVECTOR (cust), block_kind); - if (!iterate_over_symbols_terminated (block, name, - domain, callback)) - break; - } - } -} - -static void -dw2_debug_names_expand_symtabs_matching - (struct objfile *objfile, - gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher, - const lookup_name_info &lookup_name, - gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher, - gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify, - enum search_domain kind) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = get_dwarf2_per_objfile (objfile); - - /* debug_names_table is NULL if OBJF_READNOW. */ - if (!dwarf2_per_objfile->debug_names_table) - return; - - dw_expand_symtabs_matching_file_matcher (dwarf2_per_objfile, file_matcher); - - mapped_debug_names &map = *dwarf2_per_objfile->debug_names_table; - - dw2_expand_symtabs_matching_symbol (map, lookup_name, - symbol_matcher, - kind, [&] (offset_type namei) - { - /* The name was matched, now expand corresponding CUs that were - marked. */ - dw2_debug_names_iterator iter (map, kind, namei); - - struct dwarf2_per_cu_data *per_cu; - while ((per_cu = iter.next ()) != NULL) - dw2_expand_symtabs_matching_one (per_cu, file_matcher, - expansion_notify); - return true; - }); -} - -const struct quick_symbol_functions dwarf2_debug_names_functions = -{ - dw2_has_symbols, - dw2_find_last_source_symtab, - dw2_forget_cached_source_info, - dw2_map_symtabs_matching_filename, - dw2_debug_names_lookup_symbol, - dw2_print_stats, - dw2_debug_names_dump, - dw2_debug_names_expand_symtabs_for_function, - dw2_expand_all_symtabs, - dw2_expand_symtabs_with_fullname, - dw2_debug_names_map_matching_symbols, - dw2_debug_names_expand_symtabs_matching, - dw2_find_pc_sect_compunit_symtab, - NULL, - dw2_map_symbol_filenames -}; - -/* Get the content of the .gdb_index section of OBJ. SECTION_OWNER should point - to either a dwarf2_per_objfile or dwz_file object. */ - -template <typename T> -static gdb::array_view<const gdb_byte> -get_gdb_index_contents_from_section (objfile *obj, T *section_owner) -{ - dwarf2_section_info *section = §ion_owner->gdb_index; - - if (section->empty ()) - return {}; - - /* Older elfutils strip versions could keep the section in the main - executable while splitting it for the separate debug info file. */ - if ((section->get_flags () & SEC_HAS_CONTENTS) == 0) - return {}; - - section->read (obj); - - /* dwarf2_section_info::size is a bfd_size_type, while - gdb::array_view works with size_t. On 32-bit hosts, with - --enable-64-bit-bfd, bfd_size_type is a 64-bit type, while size_t - is 32-bit. So we need an explicit narrowing conversion here. - This is fine, because it's impossible to allocate or mmap an - array/buffer larger than what size_t can represent. */ - return gdb::make_array_view (section->buffer, section->size); -} - -/* Lookup the index cache for the contents of the index associated to - DWARF2_OBJ. */ - -static gdb::array_view<const gdb_byte> -get_gdb_index_contents_from_cache (objfile *obj, dwarf2_per_objfile *dwarf2_obj) -{ - const bfd_build_id *build_id = build_id_bfd_get (obj->obfd); - if (build_id == nullptr) - return {}; - - return global_index_cache.lookup_gdb_index (build_id, - &dwarf2_obj->index_cache_res); -} - -/* Same as the above, but for DWZ. */ - -static gdb::array_view<const gdb_byte> -get_gdb_index_contents_from_cache_dwz (objfile *obj, dwz_file *dwz) -{ - const bfd_build_id *build_id = build_id_bfd_get (dwz->dwz_bfd.get ()); - if (build_id == nullptr) - return {}; - - return global_index_cache.lookup_gdb_index (build_id, &dwz->index_cache_res); -} - -/* See symfile.h. */ - -bool -dwarf2_initialize_objfile (struct objfile *objfile, dw_index_kind *index_kind) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = get_dwarf2_per_objfile (objfile); - - /* If we're about to read full symbols, don't bother with the - indices. In this case we also don't care if some other debug - format is making psymtabs, because they are all about to be - expanded anyway. */ - if ((objfile->flags & OBJF_READNOW)) - { - dwarf2_per_objfile->using_index = 1; - create_all_comp_units (dwarf2_per_objfile); - create_all_type_units (dwarf2_per_objfile); - dwarf2_per_objfile->quick_file_names_table - = create_quick_file_names_table - (dwarf2_per_objfile->all_comp_units.size ()); - - for (int i = 0; i < (dwarf2_per_objfile->all_comp_units.size () - + dwarf2_per_objfile->all_type_units.size ()); ++i) - { - dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (i); - - per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack, - struct dwarf2_per_cu_quick_data); - } - - /* Return 1 so that gdb sees the "quick" functions. However, - these functions will be no-ops because we will have expanded - all symtabs. */ - *index_kind = dw_index_kind::GDB_INDEX; - return true; - } - - if (dwarf2_read_debug_names (dwarf2_per_objfile)) - { - *index_kind = dw_index_kind::DEBUG_NAMES; - return true; - } - - if (dwarf2_read_gdb_index (dwarf2_per_objfile, - get_gdb_index_contents_from_section<struct dwarf2_per_objfile>, - get_gdb_index_contents_from_section<dwz_file>)) - { - *index_kind = dw_index_kind::GDB_INDEX; - return true; - } - - /* ... otherwise, try to find the index in the index cache. */ - if (dwarf2_read_gdb_index (dwarf2_per_objfile, - get_gdb_index_contents_from_cache, - get_gdb_index_contents_from_cache_dwz)) - { - global_index_cache.hit (); - *index_kind = dw_index_kind::GDB_INDEX; - return true; - } - - global_index_cache.miss (); - return false; -} - - - -/* Build a partial symbol table. */ - -void -dwarf2_build_psymtabs (struct objfile *objfile) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = get_dwarf2_per_objfile (objfile); - - init_psymbol_list (objfile, 1024); - - try - { - /* This isn't really ideal: all the data we allocate on the - objfile's obstack is still uselessly kept around. However, - freeing it seems unsafe. */ - psymtab_discarder psymtabs (objfile); - dwarf2_build_psymtabs_hard (dwarf2_per_objfile); - psymtabs.keep (); - - /* (maybe) store an index in the cache. */ - global_index_cache.store (dwarf2_per_objfile); - } - catch (const gdb_exception_error &except) - { - exception_print (gdb_stderr, except); - } -} - -/* Return the total length of the CU described by HEADER. */ - -static unsigned int -get_cu_length (const struct comp_unit_head *header) -{ - return header->initial_length_size + header->length; -} - -/* Return TRUE if SECT_OFF is within CU_HEADER. */ - -static inline bool -offset_in_cu_p (const comp_unit_head *cu_header, sect_offset sect_off) -{ - sect_offset bottom = cu_header->sect_off; - sect_offset top = cu_header->sect_off + get_cu_length (cu_header); - - return sect_off >= bottom && sect_off < top; -} - -/* Find the base address of the compilation unit for range lists and - location lists. It will normally be specified by DW_AT_low_pc. - In DWARF-3 draft 4, the base address could be overridden by - DW_AT_entry_pc. It's been removed, but GCC still uses this for - compilation units with discontinuous ranges. */ - -static void -dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu) -{ - struct attribute *attr; - - cu->base_known = 0; - cu->base_address = 0; - - attr = dwarf2_attr (die, DW_AT_entry_pc, cu); - if (attr != nullptr) - { - cu->base_address = attr->value_as_address (); - cu->base_known = 1; - } - else - { - attr = dwarf2_attr (die, DW_AT_low_pc, cu); - if (attr != nullptr) - { - cu->base_address = attr->value_as_address (); - cu->base_known = 1; - } - } -} - -/* Read in the comp unit header information from the debug_info at info_ptr. - Use rcuh_kind::COMPILE as the default type if not known by the caller. - NOTE: This leaves members offset, first_die_offset to be filled in - by the caller. */ - -static const gdb_byte * -read_comp_unit_head (struct comp_unit_head *cu_header, - const gdb_byte *info_ptr, - struct dwarf2_section_info *section, - rcuh_kind section_kind) -{ - int signed_addr; - unsigned int bytes_read; - const char *filename = section->get_file_name (); - bfd *abfd = section->get_bfd_owner (); - - cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read); - cu_header->initial_length_size = bytes_read; - cu_header->offset_size = (bytes_read == 4) ? 4 : 8; - info_ptr += bytes_read; - cu_header->version = read_2_bytes (abfd, info_ptr); - if (cu_header->version < 2 || cu_header->version > 5) - error (_("Dwarf Error: wrong version in compilation unit header " - "(is %d, should be 2, 3, 4 or 5) [in module %s]"), - cu_header->version, filename); - info_ptr += 2; - if (cu_header->version < 5) - switch (section_kind) - { - case rcuh_kind::COMPILE: - cu_header->unit_type = DW_UT_compile; - break; - case rcuh_kind::TYPE: - cu_header->unit_type = DW_UT_type; - break; - default: - internal_error (__FILE__, __LINE__, - _("read_comp_unit_head: invalid section_kind")); - } - else - { - cu_header->unit_type = static_cast<enum dwarf_unit_type> - (read_1_byte (abfd, info_ptr)); - info_ptr += 1; - switch (cu_header->unit_type) - { - case DW_UT_compile: - case DW_UT_partial: - case DW_UT_skeleton: - case DW_UT_split_compile: - if (section_kind != rcuh_kind::COMPILE) - error (_("Dwarf Error: wrong unit_type in compilation unit header " - "(is %s, should be %s) [in module %s]"), - dwarf_unit_type_name (cu_header->unit_type), - dwarf_unit_type_name (DW_UT_type), filename); - break; - case DW_UT_type: - case DW_UT_split_type: - section_kind = rcuh_kind::TYPE; - break; - default: - error (_("Dwarf Error: wrong unit_type in compilation unit header " - "(is %#04x, should be one of: %s, %s, %s, %s or %s) " - "[in module %s]"), cu_header->unit_type, - dwarf_unit_type_name (DW_UT_compile), - dwarf_unit_type_name (DW_UT_skeleton), - dwarf_unit_type_name (DW_UT_split_compile), - dwarf_unit_type_name (DW_UT_type), - dwarf_unit_type_name (DW_UT_split_type), filename); - } - - cu_header->addr_size = read_1_byte (abfd, info_ptr); - info_ptr += 1; - } - cu_header->abbrev_sect_off = (sect_offset) read_offset (abfd, info_ptr, - cu_header, - &bytes_read); - info_ptr += bytes_read; - if (cu_header->version < 5) - { - cu_header->addr_size = read_1_byte (abfd, info_ptr); - info_ptr += 1; - } - signed_addr = bfd_get_sign_extend_vma (abfd); - if (signed_addr < 0) - internal_error (__FILE__, __LINE__, - _("read_comp_unit_head: dwarf from non elf file")); - cu_header->signed_addr_p = signed_addr; - - bool header_has_signature = section_kind == rcuh_kind::TYPE - || cu_header->unit_type == DW_UT_skeleton - || cu_header->unit_type == DW_UT_split_compile; - - if (header_has_signature) - { - cu_header->signature = read_8_bytes (abfd, info_ptr); - info_ptr += 8; - } - - if (section_kind == rcuh_kind::TYPE) - { - LONGEST type_offset; - type_offset = read_offset (abfd, info_ptr, cu_header, &bytes_read); - info_ptr += bytes_read; - cu_header->type_cu_offset_in_tu = (cu_offset) type_offset; - if (to_underlying (cu_header->type_cu_offset_in_tu) != type_offset) - error (_("Dwarf Error: Too big type_offset in compilation unit " - "header (is %s) [in module %s]"), plongest (type_offset), - filename); - } - - return info_ptr; -} - -/* Helper function that returns the proper abbrev section for - THIS_CU. */ - -static struct dwarf2_section_info * -get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu) -{ - struct dwarf2_section_info *abbrev; - struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile; - - if (this_cu->is_dwz) - abbrev = &dwarf2_get_dwz_file (dwarf2_per_objfile)->abbrev; - else - abbrev = &dwarf2_per_objfile->abbrev; - - return abbrev; -} - -/* Subroutine of read_and_check_comp_unit_head and - read_and_check_type_unit_head to simplify them. - Perform various error checking on the header. */ - -static void -error_check_comp_unit_head (struct dwarf2_per_objfile *dwarf2_per_objfile, - struct comp_unit_head *header, - struct dwarf2_section_info *section, - struct dwarf2_section_info *abbrev_section) -{ - const char *filename = section->get_file_name (); - - if (to_underlying (header->abbrev_sect_off) - >= dwarf2_section_size (dwarf2_per_objfile->objfile, abbrev_section)) - error (_("Dwarf Error: bad offset (%s) in compilation unit header " - "(offset %s + 6) [in module %s]"), - sect_offset_str (header->abbrev_sect_off), - sect_offset_str (header->sect_off), - filename); - - /* Cast to ULONGEST to use 64-bit arithmetic when possible to - avoid potential 32-bit overflow. */ - if (((ULONGEST) header->sect_off + get_cu_length (header)) - > section->size) - error (_("Dwarf Error: bad length (0x%x) in compilation unit header " - "(offset %s + 0) [in module %s]"), - header->length, sect_offset_str (header->sect_off), - filename); -} - -/* Read in a CU/TU header and perform some basic error checking. - The contents of the header are stored in HEADER. - The result is a pointer to the start of the first DIE. */ - -static const gdb_byte * -read_and_check_comp_unit_head (struct dwarf2_per_objfile *dwarf2_per_objfile, - struct comp_unit_head *header, - struct dwarf2_section_info *section, - struct dwarf2_section_info *abbrev_section, - const gdb_byte *info_ptr, - rcuh_kind section_kind) -{ - const gdb_byte *beg_of_comp_unit = info_ptr; - - header->sect_off = (sect_offset) (beg_of_comp_unit - section->buffer); - - info_ptr = read_comp_unit_head (header, info_ptr, section, section_kind); - - header->first_die_cu_offset = (cu_offset) (info_ptr - beg_of_comp_unit); - - error_check_comp_unit_head (dwarf2_per_objfile, header, section, - abbrev_section); - - return info_ptr; -} - -/* Fetch the abbreviation table offset from a comp or type unit header. */ - -static sect_offset -read_abbrev_offset (struct dwarf2_per_objfile *dwarf2_per_objfile, - struct dwarf2_section_info *section, - sect_offset sect_off) -{ - bfd *abfd = section->get_bfd_owner (); - const gdb_byte *info_ptr; - unsigned int initial_length_size, offset_size; - uint16_t version; - - section->read (dwarf2_per_objfile->objfile); - info_ptr = section->buffer + to_underlying (sect_off); - read_initial_length (abfd, info_ptr, &initial_length_size); - offset_size = initial_length_size == 4 ? 4 : 8; - info_ptr += initial_length_size; - - version = read_2_bytes (abfd, info_ptr); - info_ptr += 2; - if (version >= 5) - { - /* Skip unit type and address size. */ - info_ptr += 2; - } - - return (sect_offset) read_offset_1 (abfd, info_ptr, offset_size); -} - -/* Allocate a new partial symtab for file named NAME and mark this new - partial symtab as being an include of PST. */ - -static void -dwarf2_create_include_psymtab (const char *name, dwarf2_psymtab *pst, - struct objfile *objfile) -{ - dwarf2_psymtab *subpst = new dwarf2_psymtab (name, objfile); - - if (!IS_ABSOLUTE_PATH (subpst->filename)) - { - /* It shares objfile->objfile_obstack. */ - subpst->dirname = pst->dirname; - } - - subpst->dependencies = objfile->partial_symtabs->allocate_dependencies (1); - subpst->dependencies[0] = pst; - subpst->number_of_dependencies = 1; - - /* No private part is necessary for include psymtabs. This property - can be used to differentiate between such include psymtabs and - the regular ones. */ - subpst->per_cu_data = nullptr; -} - -/* Read the Line Number Program data and extract the list of files - included by the source file represented by PST. Build an include - partial symtab for each of these included files. */ - -static void -dwarf2_build_include_psymtabs (struct dwarf2_cu *cu, - struct die_info *die, - dwarf2_psymtab *pst) -{ - line_header_up lh; - struct attribute *attr; - - attr = dwarf2_attr (die, DW_AT_stmt_list, cu); - if (attr != nullptr) - lh = dwarf_decode_line_header ((sect_offset) DW_UNSND (attr), cu); - if (lh == NULL) - return; /* No linetable, so no includes. */ - - /* NOTE: pst->dirname is DW_AT_comp_dir (if present). Also note - that we pass in the raw text_low here; that is ok because we're - only decoding the line table to make include partial symtabs, and - so the addresses aren't really used. */ - dwarf_decode_lines (lh.get (), pst->dirname, cu, pst, - pst->raw_text_low (), 1); -} - -static hashval_t -hash_signatured_type (const void *item) -{ - const struct signatured_type *sig_type - = (const struct signatured_type *) item; - - /* This drops the top 32 bits of the signature, but is ok for a hash. */ - return sig_type->signature; -} - -static int -eq_signatured_type (const void *item_lhs, const void *item_rhs) -{ - const struct signatured_type *lhs = (const struct signatured_type *) item_lhs; - const struct signatured_type *rhs = (const struct signatured_type *) item_rhs; - - return lhs->signature == rhs->signature; -} - -/* Allocate a hash table for signatured types. */ - -static htab_t -allocate_signatured_type_table (struct objfile *objfile) -{ - return htab_create_alloc_ex (41, - hash_signatured_type, - eq_signatured_type, - NULL, - &objfile->objfile_obstack, - hashtab_obstack_allocate, - dummy_obstack_deallocate); -} - -/* A helper function to add a signatured type CU to a table. */ - -static int -add_signatured_type_cu_to_table (void **slot, void *datum) -{ - struct signatured_type *sigt = (struct signatured_type *) *slot; - std::vector<signatured_type *> *all_type_units - = (std::vector<signatured_type *> *) datum; - - all_type_units->push_back (sigt); - - return 1; -} - -/* A helper for create_debug_types_hash_table. Read types from SECTION - and fill them into TYPES_HTAB. It will process only type units, - therefore DW_UT_type. */ - -static void -create_debug_type_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile, - struct dwo_file *dwo_file, - dwarf2_section_info *section, htab_t &types_htab, - rcuh_kind section_kind) -{ - struct objfile *objfile = dwarf2_per_objfile->objfile; - struct dwarf2_section_info *abbrev_section; - bfd *abfd; - const gdb_byte *info_ptr, *end_ptr; - - abbrev_section = (dwo_file != NULL - ? &dwo_file->sections.abbrev - : &dwarf2_per_objfile->abbrev); - - if (dwarf_read_debug) - fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n", - section->get_name (), - abbrev_section->get_file_name ()); - - section->read (objfile); - info_ptr = section->buffer; - - if (info_ptr == NULL) - return; - - /* We can't set abfd until now because the section may be empty or - not present, in which case the bfd is unknown. */ - abfd = section->get_bfd_owner (); - - /* We don't use cutu_reader here because we don't need to read - any dies: the signature is in the header. */ - - end_ptr = info_ptr + section->size; - while (info_ptr < end_ptr) - { - struct signatured_type *sig_type; - struct dwo_unit *dwo_tu; - void **slot; - const gdb_byte *ptr = info_ptr; - struct comp_unit_head header; - unsigned int length; - - sect_offset sect_off = (sect_offset) (ptr - section->buffer); - - /* Initialize it due to a false compiler warning. */ - header.signature = -1; - header.type_cu_offset_in_tu = (cu_offset) -1; - - /* We need to read the type's signature in order to build the hash - table, but we don't need anything else just yet. */ - - ptr = read_and_check_comp_unit_head (dwarf2_per_objfile, &header, section, - abbrev_section, ptr, section_kind); - - length = get_cu_length (&header); - - /* Skip dummy type units. */ - if (ptr >= info_ptr + length - || peek_abbrev_code (abfd, ptr) == 0 - || header.unit_type != DW_UT_type) - { - info_ptr += length; - continue; - } - - if (types_htab == NULL) - { - if (dwo_file) - types_htab = allocate_dwo_unit_table (objfile); - else - types_htab = allocate_signatured_type_table (objfile); - } - - if (dwo_file) - { - sig_type = NULL; - dwo_tu = OBSTACK_ZALLOC (&objfile->objfile_obstack, - struct dwo_unit); - dwo_tu->dwo_file = dwo_file; - dwo_tu->signature = header.signature; - dwo_tu->type_offset_in_tu = header.type_cu_offset_in_tu; - dwo_tu->section = section; - dwo_tu->sect_off = sect_off; - dwo_tu->length = length; - } - else - { - /* N.B.: type_offset is not usable if this type uses a DWO file. - The real type_offset is in the DWO file. */ - dwo_tu = NULL; - sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack, - struct signatured_type); - sig_type->signature = header.signature; - sig_type->type_offset_in_tu = header.type_cu_offset_in_tu; - sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile; - sig_type->per_cu.is_debug_types = 1; - sig_type->per_cu.section = section; - sig_type->per_cu.sect_off = sect_off; - sig_type->per_cu.length = length; - } - - slot = htab_find_slot (types_htab, - dwo_file ? (void*) dwo_tu : (void *) sig_type, - INSERT); - gdb_assert (slot != NULL); - if (*slot != NULL) - { - sect_offset dup_sect_off; - - if (dwo_file) - { - const struct dwo_unit *dup_tu - = (const struct dwo_unit *) *slot; - - dup_sect_off = dup_tu->sect_off; - } - else - { - const struct signatured_type *dup_tu - = (const struct signatured_type *) *slot; - - dup_sect_off = dup_tu->per_cu.sect_off; - } - - complaint (_("debug type entry at offset %s is duplicate to" - " the entry at offset %s, signature %s"), - sect_offset_str (sect_off), sect_offset_str (dup_sect_off), - hex_string (header.signature)); - } - *slot = dwo_file ? (void *) dwo_tu : (void *) sig_type; - - if (dwarf_read_debug > 1) - fprintf_unfiltered (gdb_stdlog, " offset %s, signature %s\n", - sect_offset_str (sect_off), - hex_string (header.signature)); - - info_ptr += length; - } -} - -/* Create the hash table of all entries in the .debug_types - (or .debug_types.dwo) section(s). - If reading a DWO file, then DWO_FILE is a pointer to the DWO file object, - otherwise it is NULL. - - The result is a pointer to the hash table or NULL if there are no types. - - Note: This function processes DWO files only, not DWP files. */ - -static void -create_debug_types_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile, - struct dwo_file *dwo_file, - gdb::array_view<dwarf2_section_info> type_sections, - htab_t &types_htab) -{ - for (dwarf2_section_info §ion : type_sections) - create_debug_type_hash_table (dwarf2_per_objfile, dwo_file, §ion, - types_htab, rcuh_kind::TYPE); -} - -/* Create the hash table of all entries in the .debug_types section, - and initialize all_type_units. - The result is zero if there is an error (e.g. missing .debug_types section), - otherwise non-zero. */ - -static int -create_all_type_units (struct dwarf2_per_objfile *dwarf2_per_objfile) -{ - htab_t types_htab = NULL; - - create_debug_type_hash_table (dwarf2_per_objfile, NULL, - &dwarf2_per_objfile->info, types_htab, - rcuh_kind::COMPILE); - create_debug_types_hash_table (dwarf2_per_objfile, NULL, - dwarf2_per_objfile->types, types_htab); - if (types_htab == NULL) - { - dwarf2_per_objfile->signatured_types = NULL; - return 0; - } - - dwarf2_per_objfile->signatured_types = types_htab; - - gdb_assert (dwarf2_per_objfile->all_type_units.empty ()); - dwarf2_per_objfile->all_type_units.reserve (htab_elements (types_htab)); - - htab_traverse_noresize (types_htab, add_signatured_type_cu_to_table, - &dwarf2_per_objfile->all_type_units); - - return 1; -} - -/* Add an entry for signature SIG to dwarf2_per_objfile->signatured_types. - If SLOT is non-NULL, it is the entry to use in the hash table. - Otherwise we find one. */ - -static struct signatured_type * -add_type_unit (struct dwarf2_per_objfile *dwarf2_per_objfile, ULONGEST sig, - void **slot) -{ - struct objfile *objfile = dwarf2_per_objfile->objfile; - - if (dwarf2_per_objfile->all_type_units.size () - == dwarf2_per_objfile->all_type_units.capacity ()) - ++dwarf2_per_objfile->tu_stats.nr_all_type_units_reallocs; - - signatured_type *sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack, - struct signatured_type); - - dwarf2_per_objfile->all_type_units.push_back (sig_type); - sig_type->signature = sig; - sig_type->per_cu.is_debug_types = 1; - if (dwarf2_per_objfile->using_index) - { - sig_type->per_cu.v.quick = - OBSTACK_ZALLOC (&objfile->objfile_obstack, - struct dwarf2_per_cu_quick_data); - } - - if (slot == NULL) - { - slot = htab_find_slot (dwarf2_per_objfile->signatured_types, - sig_type, INSERT); - } - gdb_assert (*slot == NULL); - *slot = sig_type; - /* The rest of sig_type must be filled in by the caller. */ - return sig_type; -} - -/* Subroutine of lookup_dwo_signatured_type and lookup_dwp_signatured_type. - Fill in SIG_ENTRY with DWO_ENTRY. */ - -static void -fill_in_sig_entry_from_dwo_entry (struct dwarf2_per_objfile *dwarf2_per_objfile, - struct signatured_type *sig_entry, - struct dwo_unit *dwo_entry) -{ - /* Make sure we're not clobbering something we don't expect to. */ - gdb_assert (! sig_entry->per_cu.queued); - gdb_assert (sig_entry->per_cu.cu == NULL); - if (dwarf2_per_objfile->using_index) - { - gdb_assert (sig_entry->per_cu.v.quick != NULL); - gdb_assert (sig_entry->per_cu.v.quick->compunit_symtab == NULL); - } - else - gdb_assert (sig_entry->per_cu.v.psymtab == NULL); - gdb_assert (sig_entry->signature == dwo_entry->signature); - gdb_assert (to_underlying (sig_entry->type_offset_in_section) == 0); - gdb_assert (sig_entry->type_unit_group == NULL); - gdb_assert (sig_entry->dwo_unit == NULL); - - sig_entry->per_cu.section = dwo_entry->section; - sig_entry->per_cu.sect_off = dwo_entry->sect_off; - sig_entry->per_cu.length = dwo_entry->length; - sig_entry->per_cu.reading_dwo_directly = 1; - sig_entry->per_cu.dwarf2_per_objfile = dwarf2_per_objfile; - sig_entry->type_offset_in_tu = dwo_entry->type_offset_in_tu; - sig_entry->dwo_unit = dwo_entry; -} - -/* Subroutine of lookup_signatured_type. - If we haven't read the TU yet, create the signatured_type data structure - for a TU to be read in directly from a DWO file, bypassing the stub. - This is the "Stay in DWO Optimization": When there is no DWP file and we're - using .gdb_index, then when reading a CU we want to stay in the DWO file - containing that CU. Otherwise we could end up reading several other DWO - files (due to comdat folding) to process the transitive closure of all the - mentioned TUs, and that can be slow. The current DWO file will have every - type signature that it needs. - We only do this for .gdb_index because in the psymtab case we already have - to read all the DWOs to build the type unit groups. */ - -static struct signatured_type * -lookup_dwo_signatured_type (struct dwarf2_cu *cu, ULONGEST sig) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - struct objfile *objfile = dwarf2_per_objfile->objfile; - struct dwo_file *dwo_file; - struct dwo_unit find_dwo_entry, *dwo_entry; - struct signatured_type find_sig_entry, *sig_entry; - void **slot; - - gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index); - - /* If TU skeletons have been removed then we may not have read in any - TUs yet. */ - if (dwarf2_per_objfile->signatured_types == NULL) - { - dwarf2_per_objfile->signatured_types - = allocate_signatured_type_table (objfile); - } - - /* We only ever need to read in one copy of a signatured type. - Use the global signatured_types array to do our own comdat-folding - of types. If this is the first time we're reading this TU, and - the TU has an entry in .gdb_index, replace the recorded data from - .gdb_index with this TU. */ - - find_sig_entry.signature = sig; - slot = htab_find_slot (dwarf2_per_objfile->signatured_types, - &find_sig_entry, INSERT); - sig_entry = (struct signatured_type *) *slot; - - /* We can get here with the TU already read, *or* in the process of being - read. Don't reassign the global entry to point to this DWO if that's - the case. Also note that if the TU is already being read, it may not - have come from a DWO, the program may be a mix of Fission-compiled - code and non-Fission-compiled code. */ - - /* Have we already tried to read this TU? - Note: sig_entry can be NULL if the skeleton TU was removed (thus it - needn't exist in the global table yet). */ - if (sig_entry != NULL && sig_entry->per_cu.tu_read) - return sig_entry; - - /* Note: cu->dwo_unit is the dwo_unit that references this TU, not the - dwo_unit of the TU itself. */ - dwo_file = cu->dwo_unit->dwo_file; - - /* Ok, this is the first time we're reading this TU. */ - if (dwo_file->tus == NULL) - return NULL; - find_dwo_entry.signature = sig; - dwo_entry = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_entry); - if (dwo_entry == NULL) - return NULL; - - /* If the global table doesn't have an entry for this TU, add one. */ - if (sig_entry == NULL) - sig_entry = add_type_unit (dwarf2_per_objfile, sig, slot); - - fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile, sig_entry, dwo_entry); - sig_entry->per_cu.tu_read = 1; - return sig_entry; -} - -/* Subroutine of lookup_signatured_type. - Look up the type for signature SIG, and if we can't find SIG in .gdb_index - then try the DWP file. If the TU stub (skeleton) has been removed then - it won't be in .gdb_index. */ - -static struct signatured_type * -lookup_dwp_signatured_type (struct dwarf2_cu *cu, ULONGEST sig) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - struct objfile *objfile = dwarf2_per_objfile->objfile; - struct dwp_file *dwp_file = get_dwp_file (dwarf2_per_objfile); - struct dwo_unit *dwo_entry; - struct signatured_type find_sig_entry, *sig_entry; - void **slot; - - gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index); - gdb_assert (dwp_file != NULL); - - /* If TU skeletons have been removed then we may not have read in any - TUs yet. */ - if (dwarf2_per_objfile->signatured_types == NULL) - { - dwarf2_per_objfile->signatured_types - = allocate_signatured_type_table (objfile); - } - - find_sig_entry.signature = sig; - slot = htab_find_slot (dwarf2_per_objfile->signatured_types, - &find_sig_entry, INSERT); - sig_entry = (struct signatured_type *) *slot; - - /* Have we already tried to read this TU? - Note: sig_entry can be NULL if the skeleton TU was removed (thus it - needn't exist in the global table yet). */ - if (sig_entry != NULL) - return sig_entry; - - if (dwp_file->tus == NULL) - return NULL; - dwo_entry = lookup_dwo_unit_in_dwp (dwarf2_per_objfile, dwp_file, NULL, - sig, 1 /* is_debug_types */); - if (dwo_entry == NULL) - return NULL; - - sig_entry = add_type_unit (dwarf2_per_objfile, sig, slot); - fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile, sig_entry, dwo_entry); - - return sig_entry; -} - -/* Lookup a signature based type for DW_FORM_ref_sig8. - Returns NULL if signature SIG is not present in the table. - It is up to the caller to complain about this. */ - -static struct signatured_type * -lookup_signatured_type (struct dwarf2_cu *cu, ULONGEST sig) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - - if (cu->dwo_unit - && dwarf2_per_objfile->using_index) - { - /* We're in a DWO/DWP file, and we're using .gdb_index. - These cases require special processing. */ - if (get_dwp_file (dwarf2_per_objfile) == NULL) - return lookup_dwo_signatured_type (cu, sig); - else - return lookup_dwp_signatured_type (cu, sig); - } - else - { - struct signatured_type find_entry, *entry; - - if (dwarf2_per_objfile->signatured_types == NULL) - return NULL; - find_entry.signature = sig; - entry = ((struct signatured_type *) - htab_find (dwarf2_per_objfile->signatured_types, &find_entry)); - return entry; - } -} - -/* Return the address base of the compile unit, which, if exists, is stored - either at the attribute DW_AT_GNU_addr_base, or DW_AT_addr_base. */ -static gdb::optional<ULONGEST> -lookup_addr_base (struct die_info *comp_unit_die) -{ - struct attribute *attr; - attr = dwarf2_attr_no_follow (comp_unit_die, DW_AT_addr_base); - if (attr == nullptr) - attr = dwarf2_attr_no_follow (comp_unit_die, DW_AT_GNU_addr_base); - if (attr == nullptr) - return gdb::optional<ULONGEST> (); - return DW_UNSND (attr); -} - -/* Return range lists base of the compile unit, which, if exists, is stored - either at the attribute DW_AT_rnglists_base or DW_AT_GNU_ranges_base. */ -static ULONGEST -lookup_ranges_base (struct die_info *comp_unit_die) -{ - struct attribute *attr; - attr = dwarf2_attr_no_follow (comp_unit_die, DW_AT_rnglists_base); - if (attr == nullptr) - attr = dwarf2_attr_no_follow (comp_unit_die, DW_AT_GNU_ranges_base); - if (attr == nullptr) - return 0; - return DW_UNSND (attr); -} - -/* Low level DIE reading support. */ - -/* Initialize a die_reader_specs struct from a dwarf2_cu struct. */ - -static void -init_cu_die_reader (struct die_reader_specs *reader, - struct dwarf2_cu *cu, - struct dwarf2_section_info *section, - struct dwo_file *dwo_file, - struct abbrev_table *abbrev_table) -{ - gdb_assert (section->readin && section->buffer != NULL); - reader->abfd = section->get_bfd_owner (); - reader->cu = cu; - reader->dwo_file = dwo_file; - reader->die_section = section; - reader->buffer = section->buffer; - reader->buffer_end = section->buffer + section->size; - reader->abbrev_table = abbrev_table; -} - -/* Subroutine of cutu_reader to simplify it. - Read in the rest of a CU/TU top level DIE from DWO_UNIT. - There's just a lot of work to do, and cutu_reader is big enough - already. - - STUB_COMP_UNIT_DIE is for the stub DIE, we copy over certain attributes - from it to the DIE in the DWO. If NULL we are skipping the stub. - STUB_COMP_DIR is similar to STUB_COMP_UNIT_DIE: When reading a TU directly - from the DWO file, bypassing the stub, it contains the DW_AT_comp_dir - attribute of the referencing CU. At most one of STUB_COMP_UNIT_DIE and - STUB_COMP_DIR may be non-NULL. - *RESULT_READER,*RESULT_INFO_PTR,*RESULT_COMP_UNIT_DIE,*RESULT_HAS_CHILDREN - are filled in with the info of the DIE from the DWO file. - *RESULT_DWO_ABBREV_TABLE will be filled in with the abbrev table allocated - from the dwo. Since *RESULT_READER references this abbrev table, it must be - kept around for at least as long as *RESULT_READER. - - The result is non-zero if a valid (non-dummy) DIE was found. */ - -static int -read_cutu_die_from_dwo (struct dwarf2_per_cu_data *this_cu, - struct dwo_unit *dwo_unit, - struct die_info *stub_comp_unit_die, - const char *stub_comp_dir, - struct die_reader_specs *result_reader, - const gdb_byte **result_info_ptr, - struct die_info **result_comp_unit_die, - int *result_has_children, - abbrev_table_up *result_dwo_abbrev_table) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile; - struct objfile *objfile = dwarf2_per_objfile->objfile; - struct dwarf2_cu *cu = this_cu->cu; - bfd *abfd; - const gdb_byte *begin_info_ptr, *info_ptr; - struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges; - int i,num_extra_attrs; - struct dwarf2_section_info *dwo_abbrev_section; - struct die_info *comp_unit_die; - - /* At most one of these may be provided. */ - gdb_assert ((stub_comp_unit_die != NULL) + (stub_comp_dir != NULL) <= 1); - - /* These attributes aren't processed until later: - DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges. - DW_AT_comp_dir is used now, to find the DWO file, but it is also - referenced later. However, these attributes are found in the stub - which we won't have later. In order to not impose this complication - on the rest of the code, we read them here and copy them to the - DWO CU/TU die. */ - - stmt_list = NULL; - low_pc = NULL; - high_pc = NULL; - ranges = NULL; - comp_dir = NULL; - - if (stub_comp_unit_die != NULL) - { - /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the - DWO file. */ - if (! this_cu->is_debug_types) - stmt_list = dwarf2_attr (stub_comp_unit_die, DW_AT_stmt_list, cu); - low_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_low_pc, cu); - high_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_high_pc, cu); - ranges = dwarf2_attr (stub_comp_unit_die, DW_AT_ranges, cu); - comp_dir = dwarf2_attr (stub_comp_unit_die, DW_AT_comp_dir, cu); - - cu->addr_base = lookup_addr_base (stub_comp_unit_die); - - /* There should be a DW_AT_rnglists_base (DW_AT_GNU_ranges_base) attribute - here (if needed). We need the value before we can process - DW_AT_ranges. */ - cu->ranges_base = lookup_ranges_base (stub_comp_unit_die); - } - else if (stub_comp_dir != NULL) - { - /* Reconstruct the comp_dir attribute to simplify the code below. */ - comp_dir = XOBNEW (&cu->comp_unit_obstack, struct attribute); - comp_dir->name = DW_AT_comp_dir; - comp_dir->form = DW_FORM_string; - DW_STRING_IS_CANONICAL (comp_dir) = 0; - DW_STRING (comp_dir) = stub_comp_dir; - } - - /* Set up for reading the DWO CU/TU. */ - cu->dwo_unit = dwo_unit; - dwarf2_section_info *section = dwo_unit->section; - section->read (objfile); - abfd = section->get_bfd_owner (); - begin_info_ptr = info_ptr = (section->buffer - + to_underlying (dwo_unit->sect_off)); - dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev; - - if (this_cu->is_debug_types) - { - struct signatured_type *sig_type = (struct signatured_type *) this_cu; - - info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile, - &cu->header, section, - dwo_abbrev_section, - info_ptr, rcuh_kind::TYPE); - /* This is not an assert because it can be caused by bad debug info. */ - if (sig_type->signature != cu->header.signature) - { - error (_("Dwarf Error: signature mismatch %s vs %s while reading" - " TU at offset %s [in module %s]"), - hex_string (sig_type->signature), - hex_string (cu->header.signature), - sect_offset_str (dwo_unit->sect_off), - bfd_get_filename (abfd)); - } - gdb_assert (dwo_unit->sect_off == cu->header.sect_off); - /* For DWOs coming from DWP files, we don't know the CU length - nor the type's offset in the TU until now. */ - dwo_unit->length = get_cu_length (&cu->header); - dwo_unit->type_offset_in_tu = cu->header.type_cu_offset_in_tu; - - /* Establish the type offset that can be used to lookup the type. - For DWO files, we don't know it until now. */ - sig_type->type_offset_in_section - = dwo_unit->sect_off + to_underlying (dwo_unit->type_offset_in_tu); - } - else - { - info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile, - &cu->header, section, - dwo_abbrev_section, - info_ptr, rcuh_kind::COMPILE); - gdb_assert (dwo_unit->sect_off == cu->header.sect_off); - /* For DWOs coming from DWP files, we don't know the CU length - until now. */ - dwo_unit->length = get_cu_length (&cu->header); - } - - *result_dwo_abbrev_table - = abbrev_table_read_table (objfile, dwo_abbrev_section, - cu->header.abbrev_sect_off); - init_cu_die_reader (result_reader, cu, section, dwo_unit->dwo_file, - result_dwo_abbrev_table->get ()); - - /* Read in the die, but leave space to copy over the attributes - from the stub. This has the benefit of simplifying the rest of - the code - all the work to maintain the illusion of a single - DW_TAG_{compile,type}_unit DIE is done here. */ - num_extra_attrs = ((stmt_list != NULL) - + (low_pc != NULL) - + (high_pc != NULL) - + (ranges != NULL) - + (comp_dir != NULL)); - info_ptr = read_full_die_1 (result_reader, result_comp_unit_die, info_ptr, - result_has_children, num_extra_attrs); - - /* Copy over the attributes from the stub to the DIE we just read in. */ - comp_unit_die = *result_comp_unit_die; - i = comp_unit_die->num_attrs; - if (stmt_list != NULL) - comp_unit_die->attrs[i++] = *stmt_list; - if (low_pc != NULL) - comp_unit_die->attrs[i++] = *low_pc; - if (high_pc != NULL) - comp_unit_die->attrs[i++] = *high_pc; - if (ranges != NULL) - comp_unit_die->attrs[i++] = *ranges; - if (comp_dir != NULL) - comp_unit_die->attrs[i++] = *comp_dir; - comp_unit_die->num_attrs += num_extra_attrs; - - if (dwarf_die_debug) - { - fprintf_unfiltered (gdb_stdlog, - "Read die from %s@0x%x of %s:\n", - section->get_name (), - (unsigned) (begin_info_ptr - section->buffer), - bfd_get_filename (abfd)); - dump_die (comp_unit_die, dwarf_die_debug); - } - - /* Skip dummy compilation units. */ - if (info_ptr >= begin_info_ptr + dwo_unit->length - || peek_abbrev_code (abfd, info_ptr) == 0) - return 0; - - *result_info_ptr = info_ptr; - return 1; -} - -/* Return the signature of the compile unit, if found. In DWARF 4 and before, - the signature is in the DW_AT_GNU_dwo_id attribute. In DWARF 5 and later, the - signature is part of the header. */ -static gdb::optional<ULONGEST> -lookup_dwo_id (struct dwarf2_cu *cu, struct die_info* comp_unit_die) -{ - if (cu->header.version >= 5) - return cu->header.signature; - struct attribute *attr; - attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu); - if (attr == nullptr) - return gdb::optional<ULONGEST> (); - return DW_UNSND (attr); -} - -/* Subroutine of cutu_reader to simplify it. - Look up the DWO unit specified by COMP_UNIT_DIE of THIS_CU. - Returns NULL if the specified DWO unit cannot be found. */ - -static struct dwo_unit * -lookup_dwo_unit (struct dwarf2_per_cu_data *this_cu, - struct die_info *comp_unit_die, - const char *dwo_name) -{ - struct dwarf2_cu *cu = this_cu->cu; - struct dwo_unit *dwo_unit; - const char *comp_dir; - - gdb_assert (cu != NULL); - - /* Yeah, we look dwo_name up again, but it simplifies the code. */ - dwo_name = dwarf2_dwo_name (comp_unit_die, cu); - comp_dir = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu); - - if (this_cu->is_debug_types) - { - struct signatured_type *sig_type; - - /* Since this_cu is the first member of struct signatured_type, - we can go from a pointer to one to a pointer to the other. */ - sig_type = (struct signatured_type *) this_cu; - dwo_unit = lookup_dwo_type_unit (sig_type, dwo_name, comp_dir); - } - else - { - gdb::optional<ULONGEST> signature = lookup_dwo_id (cu, comp_unit_die); - if (!signature.has_value ()) - error (_("Dwarf Error: missing dwo_id for dwo_name %s" - " [in module %s]"), - dwo_name, objfile_name (this_cu->dwarf2_per_objfile->objfile)); - dwo_unit = lookup_dwo_comp_unit (this_cu, dwo_name, comp_dir, - *signature); - } - - return dwo_unit; -} - -/* Subroutine of cutu_reader to simplify it. - See it for a description of the parameters. - Read a TU directly from a DWO file, bypassing the stub. */ - -void -cutu_reader::init_tu_and_read_dwo_dies (struct dwarf2_per_cu_data *this_cu, - int use_existing_cu, int keep) -{ - struct signatured_type *sig_type; - struct die_reader_specs reader; - - /* Verify we can do the following downcast, and that we have the - data we need. */ - gdb_assert (this_cu->is_debug_types && this_cu->reading_dwo_directly); - sig_type = (struct signatured_type *) this_cu; - gdb_assert (sig_type->dwo_unit != NULL); - - if (use_existing_cu && this_cu->cu != NULL) - { - gdb_assert (this_cu->cu->dwo_unit == sig_type->dwo_unit); - /* There's no need to do the rereading_dwo_cu handling that - cutu_reader does since we don't read the stub. */ - } - else - { - /* If !use_existing_cu, this_cu->cu must be NULL. */ - gdb_assert (this_cu->cu == NULL); - m_new_cu.reset (new dwarf2_cu (this_cu)); - } - - /* A future optimization, if needed, would be to use an existing - abbrev table. When reading DWOs with skeletonless TUs, all the TUs - could share abbrev tables. */ - - if (read_cutu_die_from_dwo (this_cu, sig_type->dwo_unit, - NULL /* stub_comp_unit_die */, - sig_type->dwo_unit->dwo_file->comp_dir, - &reader, &info_ptr, - &comp_unit_die, &has_children, - &m_dwo_abbrev_table) == 0) - { - /* Dummy die. */ - dummy_p = true; - } -} - -/* Initialize a CU (or TU) and read its DIEs. - If the CU defers to a DWO file, read the DWO file as well. - - ABBREV_TABLE, if non-NULL, is the abbreviation table to use. - Otherwise the table specified in the comp unit header is read in and used. - This is an optimization for when we already have the abbrev table. - - If USE_EXISTING_CU is non-zero, and THIS_CU->cu is non-NULL, then use it. - Otherwise, a new CU is allocated with xmalloc. - - If KEEP is non-zero, then if we allocated a dwarf2_cu we add it to - read_in_chain. Otherwise the dwarf2_cu data is freed at the - end. */ - -cutu_reader::cutu_reader (struct dwarf2_per_cu_data *this_cu, - struct abbrev_table *abbrev_table, - int use_existing_cu, int keep, - bool skip_partial) - : die_reader_specs {}, - m_this_cu (this_cu), - m_keep (keep) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile; - struct objfile *objfile = dwarf2_per_objfile->objfile; - struct dwarf2_section_info *section = this_cu->section; - bfd *abfd = section->get_bfd_owner (); - struct dwarf2_cu *cu; - const gdb_byte *begin_info_ptr; - struct signatured_type *sig_type = NULL; - struct dwarf2_section_info *abbrev_section; - /* Non-zero if CU currently points to a DWO file and we need to - reread it. When this happens we need to reread the skeleton die - before we can reread the DWO file (this only applies to CUs, not TUs). */ - int rereading_dwo_cu = 0; - - if (dwarf_die_debug) - fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset %s\n", - this_cu->is_debug_types ? "type" : "comp", - sect_offset_str (this_cu->sect_off)); - - if (use_existing_cu) - gdb_assert (keep); - - /* If we're reading a TU directly from a DWO file, including a virtual DWO - file (instead of going through the stub), short-circuit all of this. */ - if (this_cu->reading_dwo_directly) - { - /* Narrow down the scope of possibilities to have to understand. */ - gdb_assert (this_cu->is_debug_types); - gdb_assert (abbrev_table == NULL); - init_tu_and_read_dwo_dies (this_cu, use_existing_cu, keep); - return; - } - - /* This is cheap if the section is already read in. */ - section->read (objfile); - - begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off); - - abbrev_section = get_abbrev_section_for_cu (this_cu); - - if (use_existing_cu && this_cu->cu != NULL) - { - cu = this_cu->cu; - /* If this CU is from a DWO file we need to start over, we need to - refetch the attributes from the skeleton CU. - This could be optimized by retrieving those attributes from when we - were here the first time: the previous comp_unit_die was stored in - comp_unit_obstack. But there's no data yet that we need this - optimization. */ - if (cu->dwo_unit != NULL) - rereading_dwo_cu = 1; - } - else - { - /* If !use_existing_cu, this_cu->cu must be NULL. */ - gdb_assert (this_cu->cu == NULL); - m_new_cu.reset (new dwarf2_cu (this_cu)); - cu = m_new_cu.get (); - } - - /* Get the header. */ - if (to_underlying (cu->header.first_die_cu_offset) != 0 && !rereading_dwo_cu) - { - /* We already have the header, there's no need to read it in again. */ - info_ptr += to_underlying (cu->header.first_die_cu_offset); - } - else - { - if (this_cu->is_debug_types) - { - info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile, - &cu->header, section, - abbrev_section, info_ptr, - rcuh_kind::TYPE); - - /* Since per_cu is the first member of struct signatured_type, - we can go from a pointer to one to a pointer to the other. */ - sig_type = (struct signatured_type *) this_cu; - gdb_assert (sig_type->signature == cu->header.signature); - gdb_assert (sig_type->type_offset_in_tu - == cu->header.type_cu_offset_in_tu); - gdb_assert (this_cu->sect_off == cu->header.sect_off); - - /* LENGTH has not been set yet for type units if we're - using .gdb_index. */ - this_cu->length = get_cu_length (&cu->header); - - /* Establish the type offset that can be used to lookup the type. */ - sig_type->type_offset_in_section = - this_cu->sect_off + to_underlying (sig_type->type_offset_in_tu); - - this_cu->dwarf_version = cu->header.version; - } - else - { - info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile, - &cu->header, section, - abbrev_section, - info_ptr, - rcuh_kind::COMPILE); - - gdb_assert (this_cu->sect_off == cu->header.sect_off); - gdb_assert (this_cu->length == get_cu_length (&cu->header)); - this_cu->dwarf_version = cu->header.version; - } - } - - /* Skip dummy compilation units. */ - if (info_ptr >= begin_info_ptr + this_cu->length - || peek_abbrev_code (abfd, info_ptr) == 0) - { - dummy_p = true; - return; - } - - /* If we don't have them yet, read the abbrevs for this compilation unit. - And if we need to read them now, make sure they're freed when we're - done. */ - if (abbrev_table != NULL) - gdb_assert (cu->header.abbrev_sect_off == abbrev_table->sect_off); - else - { - m_abbrev_table_holder - = abbrev_table_read_table (objfile, abbrev_section, - cu->header.abbrev_sect_off); - abbrev_table = m_abbrev_table_holder.get (); - } - - /* Read the top level CU/TU die. */ - init_cu_die_reader (this, cu, section, NULL, abbrev_table); - info_ptr = read_full_die (this, &comp_unit_die, info_ptr, &has_children); - - if (skip_partial && comp_unit_die->tag == DW_TAG_partial_unit) - { - dummy_p = true; - return; - } - - /* If we are in a DWO stub, process it and then read in the "real" CU/TU - from the DWO file. read_cutu_die_from_dwo will allocate the abbreviation - table from the DWO file and pass the ownership over to us. It will be - referenced from READER, so we must make sure to free it after we're done - with READER. - - Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains a - DWO CU, that this test will fail (the attribute will not be present). */ - const char *dwo_name = dwarf2_dwo_name (comp_unit_die, cu); - if (dwo_name != nullptr) - { - struct dwo_unit *dwo_unit; - struct die_info *dwo_comp_unit_die; - - if (has_children) - { - complaint (_("compilation unit with DW_AT_GNU_dwo_name" - " has children (offset %s) [in module %s]"), - sect_offset_str (this_cu->sect_off), - bfd_get_filename (abfd)); - } - dwo_unit = lookup_dwo_unit (this_cu, comp_unit_die, dwo_name); - if (dwo_unit != NULL) - { - if (read_cutu_die_from_dwo (this_cu, dwo_unit, - comp_unit_die, NULL, - this, &info_ptr, - &dwo_comp_unit_die, &has_children, - &m_dwo_abbrev_table) == 0) - { - /* Dummy die. */ - dummy_p = true; - return; - } - comp_unit_die = dwo_comp_unit_die; - } - else - { - /* Yikes, we couldn't find the rest of the DIE, we only have - the stub. A complaint has already been logged. There's - not much more we can do except pass on the stub DIE to - die_reader_func. We don't want to throw an error on bad - debug info. */ - } - } -} - -cutu_reader::~cutu_reader () -{ - /* Done, clean up. */ - if (m_new_cu != NULL && m_keep && !dummy_p) - { - struct dwarf2_per_objfile *dwarf2_per_objfile - = m_this_cu->dwarf2_per_objfile; - /* Link this CU into read_in_chain. */ - m_this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain; - dwarf2_per_objfile->read_in_chain = m_this_cu; - /* The chain owns it now. */ - m_new_cu.release (); - } -} - -/* Read CU/TU THIS_CU but do not follow DW_AT_GNU_dwo_name (DW_AT_dwo_name) - if present. DWO_FILE, if non-NULL, is the DWO file to read (the caller is - assumed to have already done the lookup to find the DWO file). - - The caller is required to fill in THIS_CU->section, THIS_CU->offset, and - THIS_CU->is_debug_types, but nothing else. - - We fill in THIS_CU->length. - - THIS_CU->cu is always freed when done. - This is done in order to not leave THIS_CU->cu in a state where we have - to care whether it refers to the "main" CU or the DWO CU. - - When parent_cu is passed, it is used to provide a default value for - str_offsets_base and addr_base from the parent. */ - -cutu_reader::cutu_reader (struct dwarf2_per_cu_data *this_cu, - struct dwarf2_cu *parent_cu, - struct dwo_file *dwo_file) - : die_reader_specs {}, - m_this_cu (this_cu) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile; - struct objfile *objfile = dwarf2_per_objfile->objfile; - struct dwarf2_section_info *section = this_cu->section; - bfd *abfd = section->get_bfd_owner (); - struct dwarf2_section_info *abbrev_section; - const gdb_byte *begin_info_ptr, *info_ptr; - int has_children; - - if (dwarf_die_debug) - fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset %s\n", - this_cu->is_debug_types ? "type" : "comp", - sect_offset_str (this_cu->sect_off)); - - gdb_assert (this_cu->cu == NULL); - - abbrev_section = (dwo_file != NULL - ? &dwo_file->sections.abbrev - : get_abbrev_section_for_cu (this_cu)); - - /* This is cheap if the section is already read in. */ - section->read (objfile); - - m_new_cu.reset (new dwarf2_cu (this_cu)); - - begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off); - info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile, - &m_new_cu->header, section, - abbrev_section, info_ptr, - (this_cu->is_debug_types - ? rcuh_kind::TYPE - : rcuh_kind::COMPILE)); - - if (parent_cu != nullptr) - { - m_new_cu->str_offsets_base = parent_cu->str_offsets_base; - m_new_cu->addr_base = parent_cu->addr_base; - } - this_cu->length = get_cu_length (&m_new_cu->header); - - /* Skip dummy compilation units. */ - if (info_ptr >= begin_info_ptr + this_cu->length - || peek_abbrev_code (abfd, info_ptr) == 0) - { - dummy_p = true; - return; - } - - m_abbrev_table_holder - = abbrev_table_read_table (objfile, abbrev_section, - m_new_cu->header.abbrev_sect_off); - - init_cu_die_reader (this, m_new_cu.get (), section, dwo_file, - m_abbrev_table_holder.get ()); - info_ptr = read_full_die (this, &comp_unit_die, info_ptr, &has_children); -} - - -/* Type Unit Groups. - - Type Unit Groups are a way to collapse the set of all TUs (type units) into - a more manageable set. The grouping is done by DW_AT_stmt_list entry - so that all types coming from the same compilation (.o file) are grouped - together. A future step could be to put the types in the same symtab as - the CU the types ultimately came from. */ - -static hashval_t -hash_type_unit_group (const void *item) -{ - const struct type_unit_group *tu_group - = (const struct type_unit_group *) item; - - return hash_stmt_list_entry (&tu_group->hash); -} - -static int -eq_type_unit_group (const void *item_lhs, const void *item_rhs) -{ - const struct type_unit_group *lhs = (const struct type_unit_group *) item_lhs; - const struct type_unit_group *rhs = (const struct type_unit_group *) item_rhs; - - return eq_stmt_list_entry (&lhs->hash, &rhs->hash); -} - -/* Allocate a hash table for type unit groups. */ - -static htab_t -allocate_type_unit_groups_table (struct objfile *objfile) -{ - return htab_create_alloc_ex (3, - hash_type_unit_group, - eq_type_unit_group, - NULL, - &objfile->objfile_obstack, - hashtab_obstack_allocate, - dummy_obstack_deallocate); -} - -/* Type units that don't have DW_AT_stmt_list are grouped into their own - partial symtabs. We combine several TUs per psymtab to not let the size - of any one psymtab grow too big. */ -#define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31) -#define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10 - -/* Helper routine for get_type_unit_group. - Create the type_unit_group object used to hold one or more TUs. */ - -static struct type_unit_group * -create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - struct objfile *objfile = dwarf2_per_objfile->objfile; - struct dwarf2_per_cu_data *per_cu; - struct type_unit_group *tu_group; - - tu_group = OBSTACK_ZALLOC (&objfile->objfile_obstack, - struct type_unit_group); - per_cu = &tu_group->per_cu; - per_cu->dwarf2_per_objfile = dwarf2_per_objfile; - - if (dwarf2_per_objfile->using_index) - { - per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack, - struct dwarf2_per_cu_quick_data); - } - else - { - unsigned int line_offset = to_underlying (line_offset_struct); - dwarf2_psymtab *pst; - std::string name; - - /* Give the symtab a useful name for debug purposes. */ - if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0) - name = string_printf ("<type_units_%d>", - (line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB)); - else - name = string_printf ("<type_units_at_0x%x>", line_offset); - - pst = create_partial_symtab (per_cu, name.c_str ()); - pst->anonymous = true; - } - - tu_group->hash.dwo_unit = cu->dwo_unit; - tu_group->hash.line_sect_off = line_offset_struct; - - return tu_group; -} - -/* Look up the type_unit_group for type unit CU, and create it if necessary. - STMT_LIST is a DW_AT_stmt_list attribute. */ - -static struct type_unit_group * -get_type_unit_group (struct dwarf2_cu *cu, const struct attribute *stmt_list) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats; - struct type_unit_group *tu_group; - void **slot; - unsigned int line_offset; - struct type_unit_group type_unit_group_for_lookup; - - if (dwarf2_per_objfile->type_unit_groups == NULL) - { - dwarf2_per_objfile->type_unit_groups = - allocate_type_unit_groups_table (dwarf2_per_objfile->objfile); - } - - /* Do we need to create a new group, or can we use an existing one? */ - - if (stmt_list) - { - line_offset = DW_UNSND (stmt_list); - ++tu_stats->nr_symtab_sharers; - } - else - { - /* Ugh, no stmt_list. Rare, but we have to handle it. - We can do various things here like create one group per TU or - spread them over multiple groups to split up the expansion work. - To avoid worst case scenarios (too many groups or too large groups) - we, umm, group them in bunches. */ - line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB - | (tu_stats->nr_stmt_less_type_units - / NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE)); - ++tu_stats->nr_stmt_less_type_units; - } - - type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit; - type_unit_group_for_lookup.hash.line_sect_off = (sect_offset) line_offset; - slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups, - &type_unit_group_for_lookup, INSERT); - if (*slot != NULL) - { - tu_group = (struct type_unit_group *) *slot; - gdb_assert (tu_group != NULL); - } - else - { - sect_offset line_offset_struct = (sect_offset) line_offset; - tu_group = create_type_unit_group (cu, line_offset_struct); - *slot = tu_group; - ++tu_stats->nr_symtabs; - } - - return tu_group; -} - -/* Partial symbol tables. */ - -/* Create a psymtab named NAME and assign it to PER_CU. - - The caller must fill in the following details: - dirname, textlow, texthigh. */ - -static dwarf2_psymtab * -create_partial_symtab (struct dwarf2_per_cu_data *per_cu, const char *name) -{ - struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile; - dwarf2_psymtab *pst; - - pst = new dwarf2_psymtab (name, objfile, 0); - - pst->psymtabs_addrmap_supported = true; - - /* This is the glue that links PST into GDB's symbol API. */ - pst->per_cu_data = per_cu; - per_cu->v.psymtab = pst; - - return pst; -} - -/* DIE reader function for process_psymtab_comp_unit. */ - -static void -process_psymtab_comp_unit_reader (const struct die_reader_specs *reader, - const gdb_byte *info_ptr, - struct die_info *comp_unit_die, - int has_children, - int want_partial_unit, - enum language pretend_language) -{ - struct dwarf2_cu *cu = reader->cu; - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - struct gdbarch *gdbarch = get_objfile_arch (objfile); - struct dwarf2_per_cu_data *per_cu = cu->per_cu; - CORE_ADDR baseaddr; - CORE_ADDR best_lowpc = 0, best_highpc = 0; - dwarf2_psymtab *pst; - enum pc_bounds_kind cu_bounds_kind; - const char *filename; - - if (comp_unit_die->tag == DW_TAG_partial_unit && !want_partial_unit) - return; - - gdb_assert (! per_cu->is_debug_types); - - prepare_one_comp_unit (cu, comp_unit_die, pretend_language); - - /* Allocate a new partial symbol table structure. */ - filename = dwarf2_string_attr (comp_unit_die, DW_AT_name, cu); - if (filename == NULL) - filename = ""; - - pst = create_partial_symtab (per_cu, filename); - - /* This must be done before calling dwarf2_build_include_psymtabs. */ - pst->dirname = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu); - - baseaddr = objfile->text_section_offset (); - - dwarf2_find_base_address (comp_unit_die, cu); - - /* Possibly set the default values of LOWPC and HIGHPC from - `DW_AT_ranges'. */ - cu_bounds_kind = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc, - &best_highpc, cu, pst); - if (cu_bounds_kind == PC_BOUNDS_HIGH_LOW && best_lowpc < best_highpc) - { - CORE_ADDR low - = (gdbarch_adjust_dwarf2_addr (gdbarch, best_lowpc + baseaddr) - - baseaddr); - CORE_ADDR high - = (gdbarch_adjust_dwarf2_addr (gdbarch, best_highpc + baseaddr) - - baseaddr - 1); - /* Store the contiguous range if it is not empty; it can be - empty for CUs with no code. */ - addrmap_set_empty (objfile->partial_symtabs->psymtabs_addrmap, - low, high, pst); - } - - /* Check if comp unit has_children. - If so, read the rest of the partial symbols from this comp unit. - If not, there's no more debug_info for this comp unit. */ - if (has_children) - { - struct partial_die_info *first_die; - CORE_ADDR lowpc, highpc; - - lowpc = ((CORE_ADDR) -1); - highpc = ((CORE_ADDR) 0); - - first_die = load_partial_dies (reader, info_ptr, 1); - - scan_partial_symbols (first_die, &lowpc, &highpc, - cu_bounds_kind <= PC_BOUNDS_INVALID, cu); - - /* If we didn't find a lowpc, set it to highpc to avoid - complaints from `maint check'. */ - if (lowpc == ((CORE_ADDR) -1)) - lowpc = highpc; - - /* If the compilation unit didn't have an explicit address range, - then use the information extracted from its child dies. */ - if (cu_bounds_kind <= PC_BOUNDS_INVALID) - { - best_lowpc = lowpc; - best_highpc = highpc; - } - } - pst->set_text_low (gdbarch_adjust_dwarf2_addr (gdbarch, - best_lowpc + baseaddr) - - baseaddr); - pst->set_text_high (gdbarch_adjust_dwarf2_addr (gdbarch, - best_highpc + baseaddr) - - baseaddr); - - end_psymtab_common (objfile, pst); - - if (!cu->per_cu->imported_symtabs_empty ()) - { - int i; - int len = cu->per_cu->imported_symtabs_size (); - - /* Fill in 'dependencies' here; we fill in 'users' in a - post-pass. */ - pst->number_of_dependencies = len; - pst->dependencies - = objfile->partial_symtabs->allocate_dependencies (len); - for (i = 0; i < len; ++i) - { - pst->dependencies[i] - = cu->per_cu->imported_symtabs->at (i)->v.psymtab; - } - - cu->per_cu->imported_symtabs_free (); - } - - /* Get the list of files included in the current compilation unit, - and build a psymtab for each of them. */ - dwarf2_build_include_psymtabs (cu, comp_unit_die, pst); - - if (dwarf_read_debug) - fprintf_unfiltered (gdb_stdlog, - "Psymtab for %s unit @%s: %s - %s" - ", %d global, %d static syms\n", - per_cu->is_debug_types ? "type" : "comp", - sect_offset_str (per_cu->sect_off), - paddress (gdbarch, pst->text_low (objfile)), - paddress (gdbarch, pst->text_high (objfile)), - pst->n_global_syms, pst->n_static_syms); -} - -/* Subroutine of dwarf2_build_psymtabs_hard to simplify it. - Process compilation unit THIS_CU for a psymtab. */ - -static void -process_psymtab_comp_unit (struct dwarf2_per_cu_data *this_cu, - int want_partial_unit, - enum language pretend_language) -{ - /* If this compilation unit was already read in, free the - cached copy in order to read it in again. This is - necessary because we skipped some symbols when we first - read in the compilation unit (see load_partial_dies). - This problem could be avoided, but the benefit is unclear. */ - if (this_cu->cu != NULL) - free_one_cached_comp_unit (this_cu); - - cutu_reader reader (this_cu, NULL, 0, 0, false); - - if (reader.dummy_p) - { - /* Nothing. */ - } - else if (this_cu->is_debug_types) - build_type_psymtabs_reader (&reader, reader.info_ptr, reader.comp_unit_die, - reader.has_children); - else - process_psymtab_comp_unit_reader (&reader, reader.info_ptr, - reader.comp_unit_die, - reader.has_children, - want_partial_unit, - pretend_language); - - /* Age out any secondary CUs. */ - age_cached_comp_units (this_cu->dwarf2_per_objfile); -} - -/* Reader function for build_type_psymtabs. */ - -static void -build_type_psymtabs_reader (const struct die_reader_specs *reader, - const gdb_byte *info_ptr, - struct die_info *type_unit_die, - int has_children) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = reader->cu->per_cu->dwarf2_per_objfile; - struct objfile *objfile = dwarf2_per_objfile->objfile; - struct dwarf2_cu *cu = reader->cu; - struct dwarf2_per_cu_data *per_cu = cu->per_cu; - struct signatured_type *sig_type; - struct type_unit_group *tu_group; - struct attribute *attr; - struct partial_die_info *first_die; - CORE_ADDR lowpc, highpc; - dwarf2_psymtab *pst; - - gdb_assert (per_cu->is_debug_types); - sig_type = (struct signatured_type *) per_cu; - - if (! has_children) - return; - - attr = dwarf2_attr_no_follow (type_unit_die, DW_AT_stmt_list); - tu_group = get_type_unit_group (cu, attr); - - if (tu_group->tus == nullptr) - tu_group->tus = new std::vector<signatured_type *>; - tu_group->tus->push_back (sig_type); - - prepare_one_comp_unit (cu, type_unit_die, language_minimal); - pst = create_partial_symtab (per_cu, ""); - pst->anonymous = true; - - first_die = load_partial_dies (reader, info_ptr, 1); - - lowpc = (CORE_ADDR) -1; - highpc = (CORE_ADDR) 0; - scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu); - - end_psymtab_common (objfile, pst); -} - -/* Struct used to sort TUs by their abbreviation table offset. */ - -struct tu_abbrev_offset -{ - tu_abbrev_offset (signatured_type *sig_type_, sect_offset abbrev_offset_) - : sig_type (sig_type_), abbrev_offset (abbrev_offset_) - {} - - signatured_type *sig_type; - sect_offset abbrev_offset; -}; - -/* Helper routine for build_type_psymtabs_1, passed to std::sort. */ - -static bool -sort_tu_by_abbrev_offset (const struct tu_abbrev_offset &a, - const struct tu_abbrev_offset &b) -{ - return a.abbrev_offset < b.abbrev_offset; -} - -/* Efficiently read all the type units. - This does the bulk of the work for build_type_psymtabs. - - The efficiency is because we sort TUs by the abbrev table they use and - only read each abbrev table once. In one program there are 200K TUs - sharing 8K abbrev tables. - - The main purpose of this function is to support building the - dwarf2_per_objfile->type_unit_groups table. - TUs typically share the DW_AT_stmt_list of the CU they came from, so we - can collapse the search space by grouping them by stmt_list. - The savings can be significant, in the same program from above the 200K TUs - share 8K stmt_list tables. - - FUNC is expected to call get_type_unit_group, which will create the - struct type_unit_group if necessary and add it to - dwarf2_per_objfile->type_unit_groups. */ - -static void -build_type_psymtabs_1 (struct dwarf2_per_objfile *dwarf2_per_objfile) -{ - struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats; - abbrev_table_up abbrev_table; - sect_offset abbrev_offset; - - /* It's up to the caller to not call us multiple times. */ - gdb_assert (dwarf2_per_objfile->type_unit_groups == NULL); - - if (dwarf2_per_objfile->all_type_units.empty ()) - return; - - /* TUs typically share abbrev tables, and there can be way more TUs than - abbrev tables. Sort by abbrev table to reduce the number of times we - read each abbrev table in. - Alternatives are to punt or to maintain a cache of abbrev tables. - This is simpler and efficient enough for now. - - Later we group TUs by their DW_AT_stmt_list value (as this defines the - symtab to use). Typically TUs with the same abbrev offset have the same - stmt_list value too so in practice this should work well. - - The basic algorithm here is: - - sort TUs by abbrev table - for each TU with same abbrev table: - read abbrev table if first user - read TU top level DIE - [IWBN if DWO skeletons had DW_AT_stmt_list] - call FUNC */ - - if (dwarf_read_debug) - fprintf_unfiltered (gdb_stdlog, "Building type unit groups ...\n"); - - /* Sort in a separate table to maintain the order of all_type_units - for .gdb_index: TU indices directly index all_type_units. */ - std::vector<tu_abbrev_offset> sorted_by_abbrev; - sorted_by_abbrev.reserve (dwarf2_per_objfile->all_type_units.size ()); - - for (signatured_type *sig_type : dwarf2_per_objfile->all_type_units) - sorted_by_abbrev.emplace_back - (sig_type, read_abbrev_offset (dwarf2_per_objfile, - sig_type->per_cu.section, - sig_type->per_cu.sect_off)); - - std::sort (sorted_by_abbrev.begin (), sorted_by_abbrev.end (), - sort_tu_by_abbrev_offset); - - abbrev_offset = (sect_offset) ~(unsigned) 0; - - for (const tu_abbrev_offset &tu : sorted_by_abbrev) - { - /* Switch to the next abbrev table if necessary. */ - if (abbrev_table == NULL - || tu.abbrev_offset != abbrev_offset) - { - abbrev_offset = tu.abbrev_offset; - abbrev_table = - abbrev_table_read_table (dwarf2_per_objfile->objfile, - &dwarf2_per_objfile->abbrev, - abbrev_offset); - ++tu_stats->nr_uniq_abbrev_tables; - } - - cutu_reader reader (&tu.sig_type->per_cu, abbrev_table.get (), - 0, 0, false); - if (!reader.dummy_p) - build_type_psymtabs_reader (&reader, reader.info_ptr, - reader.comp_unit_die, - reader.has_children); - } -} - -/* Print collected type unit statistics. */ - -static void -print_tu_stats (struct dwarf2_per_objfile *dwarf2_per_objfile) -{ - struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats; - - fprintf_unfiltered (gdb_stdlog, "Type unit statistics:\n"); - fprintf_unfiltered (gdb_stdlog, " %zu TUs\n", - dwarf2_per_objfile->all_type_units.size ()); - fprintf_unfiltered (gdb_stdlog, " %d uniq abbrev tables\n", - tu_stats->nr_uniq_abbrev_tables); - fprintf_unfiltered (gdb_stdlog, " %d symtabs from stmt_list entries\n", - tu_stats->nr_symtabs); - fprintf_unfiltered (gdb_stdlog, " %d symtab sharers\n", - tu_stats->nr_symtab_sharers); - fprintf_unfiltered (gdb_stdlog, " %d type units without a stmt_list\n", - tu_stats->nr_stmt_less_type_units); - fprintf_unfiltered (gdb_stdlog, " %d all_type_units reallocs\n", - tu_stats->nr_all_type_units_reallocs); -} - -/* Traversal function for build_type_psymtabs. */ - -static int -build_type_psymtab_dependencies (void **slot, void *info) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = (struct dwarf2_per_objfile *) info; - struct objfile *objfile = dwarf2_per_objfile->objfile; - struct type_unit_group *tu_group = (struct type_unit_group *) *slot; - struct dwarf2_per_cu_data *per_cu = &tu_group->per_cu; - dwarf2_psymtab *pst = per_cu->v.psymtab; - int len = (tu_group->tus == nullptr) ? 0 : tu_group->tus->size (); - int i; - - gdb_assert (len > 0); - gdb_assert (IS_TYPE_UNIT_GROUP (per_cu)); - - pst->number_of_dependencies = len; - pst->dependencies = objfile->partial_symtabs->allocate_dependencies (len); - for (i = 0; i < len; ++i) - { - struct signatured_type *iter = tu_group->tus->at (i); - gdb_assert (iter->per_cu.is_debug_types); - pst->dependencies[i] = iter->per_cu.v.psymtab; - iter->type_unit_group = tu_group; - } - - delete tu_group->tus; - tu_group->tus = nullptr; - - return 1; -} - -/* Subroutine of dwarf2_build_psymtabs_hard to simplify it. - Build partial symbol tables for the .debug_types comp-units. */ - -static void -build_type_psymtabs (struct dwarf2_per_objfile *dwarf2_per_objfile) -{ - if (! create_all_type_units (dwarf2_per_objfile)) - return; - - build_type_psymtabs_1 (dwarf2_per_objfile); -} - -/* Traversal function for process_skeletonless_type_unit. - Read a TU in a DWO file and build partial symbols for it. */ - -static int -process_skeletonless_type_unit (void **slot, void *info) -{ - struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot; - struct dwarf2_per_objfile *dwarf2_per_objfile - = (struct dwarf2_per_objfile *) info; - struct signatured_type find_entry, *entry; - - /* If this TU doesn't exist in the global table, add it and read it in. */ - - if (dwarf2_per_objfile->signatured_types == NULL) - { - dwarf2_per_objfile->signatured_types - = allocate_signatured_type_table (dwarf2_per_objfile->objfile); - } - - find_entry.signature = dwo_unit->signature; - slot = htab_find_slot (dwarf2_per_objfile->signatured_types, &find_entry, - INSERT); - /* If we've already seen this type there's nothing to do. What's happening - is we're doing our own version of comdat-folding here. */ - if (*slot != NULL) - return 1; - - /* This does the job that create_all_type_units would have done for - this TU. */ - entry = add_type_unit (dwarf2_per_objfile, dwo_unit->signature, slot); - fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile, entry, dwo_unit); - *slot = entry; - - /* This does the job that build_type_psymtabs_1 would have done. */ - cutu_reader reader (&entry->per_cu, NULL, 0, 0, false); - if (!reader.dummy_p) - build_type_psymtabs_reader (&reader, reader.info_ptr, - reader.comp_unit_die, reader.has_children); - - return 1; -} - -/* Traversal function for process_skeletonless_type_units. */ - -static int -process_dwo_file_for_skeletonless_type_units (void **slot, void *info) -{ - struct dwo_file *dwo_file = (struct dwo_file *) *slot; - - if (dwo_file->tus != NULL) - { - htab_traverse_noresize (dwo_file->tus, - process_skeletonless_type_unit, info); - } - - return 1; -} - -/* Scan all TUs of DWO files, verifying we've processed them. - This is needed in case a TU was emitted without its skeleton. - Note: This can't be done until we know what all the DWO files are. */ - -static void -process_skeletonless_type_units (struct dwarf2_per_objfile *dwarf2_per_objfile) -{ - /* Skeletonless TUs in DWP files without .gdb_index is not supported yet. */ - if (get_dwp_file (dwarf2_per_objfile) == NULL - && dwarf2_per_objfile->dwo_files != NULL) - { - htab_traverse_noresize (dwarf2_per_objfile->dwo_files.get (), - process_dwo_file_for_skeletonless_type_units, - dwarf2_per_objfile); - } -} - -/* Compute the 'user' field for each psymtab in DWARF2_PER_OBJFILE. */ - -static void -set_partial_user (struct dwarf2_per_objfile *dwarf2_per_objfile) -{ - for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units) - { - dwarf2_psymtab *pst = per_cu->v.psymtab; - - if (pst == NULL) - continue; - - for (int j = 0; j < pst->number_of_dependencies; ++j) - { - /* Set the 'user' field only if it is not already set. */ - if (pst->dependencies[j]->user == NULL) - pst->dependencies[j]->user = pst; - } - } -} - -/* Build the partial symbol table by doing a quick pass through the - .debug_info and .debug_abbrev sections. */ - -static void -dwarf2_build_psymtabs_hard (struct dwarf2_per_objfile *dwarf2_per_objfile) -{ - struct objfile *objfile = dwarf2_per_objfile->objfile; - - if (dwarf_read_debug) - { - fprintf_unfiltered (gdb_stdlog, "Building psymtabs of objfile %s ...\n", - objfile_name (objfile)); - } - - dwarf2_per_objfile->reading_partial_symbols = 1; - - dwarf2_per_objfile->info.read (objfile); - - /* Any cached compilation units will be linked by the per-objfile - read_in_chain. Make sure to free them when we're done. */ - free_cached_comp_units freer (dwarf2_per_objfile); - - build_type_psymtabs (dwarf2_per_objfile); - - create_all_comp_units (dwarf2_per_objfile); - - /* Create a temporary address map on a temporary obstack. We later - copy this to the final obstack. */ - auto_obstack temp_obstack; - - scoped_restore save_psymtabs_addrmap - = make_scoped_restore (&objfile->partial_symtabs->psymtabs_addrmap, - addrmap_create_mutable (&temp_obstack)); - - for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units) - process_psymtab_comp_unit (per_cu, 0, language_minimal); - - /* This has to wait until we read the CUs, we need the list of DWOs. */ - process_skeletonless_type_units (dwarf2_per_objfile); - - /* Now that all TUs have been processed we can fill in the dependencies. */ - if (dwarf2_per_objfile->type_unit_groups != NULL) - { - htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups, - build_type_psymtab_dependencies, dwarf2_per_objfile); - } - - if (dwarf_read_debug) - print_tu_stats (dwarf2_per_objfile); - - set_partial_user (dwarf2_per_objfile); - - objfile->partial_symtabs->psymtabs_addrmap - = addrmap_create_fixed (objfile->partial_symtabs->psymtabs_addrmap, - objfile->partial_symtabs->obstack ()); - /* At this point we want to keep the address map. */ - save_psymtabs_addrmap.release (); - - if (dwarf_read_debug) - fprintf_unfiltered (gdb_stdlog, "Done building psymtabs of %s\n", - objfile_name (objfile)); -} - -/* Load the partial DIEs for a secondary CU into memory. - This is also used when rereading a primary CU with load_all_dies. */ - -static void -load_partial_comp_unit (struct dwarf2_per_cu_data *this_cu) -{ - cutu_reader reader (this_cu, NULL, 1, 1, false); - - if (!reader.dummy_p) - { - prepare_one_comp_unit (reader.cu, reader.comp_unit_die, - language_minimal); - - /* Check if comp unit has_children. - If so, read the rest of the partial symbols from this comp unit. - If not, there's no more debug_info for this comp unit. */ - if (reader.has_children) - load_partial_dies (&reader, reader.info_ptr, 0); - } -} - -static void -read_comp_units_from_section (struct dwarf2_per_objfile *dwarf2_per_objfile, - struct dwarf2_section_info *section, - struct dwarf2_section_info *abbrev_section, - unsigned int is_dwz) -{ - const gdb_byte *info_ptr; - struct objfile *objfile = dwarf2_per_objfile->objfile; - - if (dwarf_read_debug) - fprintf_unfiltered (gdb_stdlog, "Reading %s for %s\n", - section->get_name (), - section->get_file_name ()); - - section->read (objfile); - - info_ptr = section->buffer; - - while (info_ptr < section->buffer + section->size) - { - struct dwarf2_per_cu_data *this_cu; - - sect_offset sect_off = (sect_offset) (info_ptr - section->buffer); - - comp_unit_head cu_header; - read_and_check_comp_unit_head (dwarf2_per_objfile, &cu_header, section, - abbrev_section, info_ptr, - rcuh_kind::COMPILE); - - /* Save the compilation unit for later lookup. */ - if (cu_header.unit_type != DW_UT_type) - { - this_cu = XOBNEW (&objfile->objfile_obstack, - struct dwarf2_per_cu_data); - memset (this_cu, 0, sizeof (*this_cu)); - } - else - { - auto sig_type = XOBNEW (&objfile->objfile_obstack, - struct signatured_type); - memset (sig_type, 0, sizeof (*sig_type)); - sig_type->signature = cu_header.signature; - sig_type->type_offset_in_tu = cu_header.type_cu_offset_in_tu; - this_cu = &sig_type->per_cu; - } - this_cu->is_debug_types = (cu_header.unit_type == DW_UT_type); - this_cu->sect_off = sect_off; - this_cu->length = cu_header.length + cu_header.initial_length_size; - this_cu->is_dwz = is_dwz; - this_cu->dwarf2_per_objfile = dwarf2_per_objfile; - this_cu->section = section; - - dwarf2_per_objfile->all_comp_units.push_back (this_cu); - - info_ptr = info_ptr + this_cu->length; - } -} - -/* Create a list of all compilation units in OBJFILE. - This is only done for -readnow and building partial symtabs. */ - -static void -create_all_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile) -{ - gdb_assert (dwarf2_per_objfile->all_comp_units.empty ()); - read_comp_units_from_section (dwarf2_per_objfile, &dwarf2_per_objfile->info, - &dwarf2_per_objfile->abbrev, 0); - - dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile); - if (dwz != NULL) - read_comp_units_from_section (dwarf2_per_objfile, &dwz->info, &dwz->abbrev, - 1); -} - -/* Process all loaded DIEs for compilation unit CU, starting at - FIRST_DIE. The caller should pass SET_ADDRMAP == 1 if the compilation - unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or - DW_AT_ranges). See the comments of add_partial_subprogram on how - SET_ADDRMAP is used and how *LOWPC and *HIGHPC are updated. */ - -static void -scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc, - CORE_ADDR *highpc, int set_addrmap, - struct dwarf2_cu *cu) -{ - struct partial_die_info *pdi; - - /* Now, march along the PDI's, descending into ones which have - interesting children but skipping the children of the other ones, - until we reach the end of the compilation unit. */ - - pdi = first_die; - - while (pdi != NULL) - { - pdi->fixup (cu); - - /* Anonymous namespaces or modules have no name but have interesting - children, so we need to look at them. Ditto for anonymous - enums. */ - - if (pdi->name != NULL || pdi->tag == DW_TAG_namespace - || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type - || pdi->tag == DW_TAG_imported_unit - || pdi->tag == DW_TAG_inlined_subroutine) - { - switch (pdi->tag) - { - case DW_TAG_subprogram: - case DW_TAG_inlined_subroutine: - add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu); - break; - case DW_TAG_constant: - case DW_TAG_variable: - case DW_TAG_typedef: - case DW_TAG_union_type: - if (!pdi->is_declaration) - { - add_partial_symbol (pdi, cu); - } - break; - case DW_TAG_class_type: - case DW_TAG_interface_type: - case DW_TAG_structure_type: - if (!pdi->is_declaration) - { - add_partial_symbol (pdi, cu); - } - if ((cu->language == language_rust - || cu->language == language_cplus) && pdi->has_children) - scan_partial_symbols (pdi->die_child, lowpc, highpc, - set_addrmap, cu); - break; - case DW_TAG_enumeration_type: - if (!pdi->is_declaration) - add_partial_enumeration (pdi, cu); - break; - case DW_TAG_base_type: - case DW_TAG_subrange_type: - /* File scope base type definitions are added to the partial - symbol table. */ - add_partial_symbol (pdi, cu); - break; - case DW_TAG_namespace: - add_partial_namespace (pdi, lowpc, highpc, set_addrmap, cu); - break; - case DW_TAG_module: - if (!pdi->is_declaration) - add_partial_module (pdi, lowpc, highpc, set_addrmap, cu); - break; - case DW_TAG_imported_unit: - { - struct dwarf2_per_cu_data *per_cu; - - /* For now we don't handle imported units in type units. */ - if (cu->per_cu->is_debug_types) - { - error (_("Dwarf Error: DW_TAG_imported_unit is not" - " supported in type units [in module %s]"), - objfile_name (cu->per_cu->dwarf2_per_objfile->objfile)); - } - - per_cu = dwarf2_find_containing_comp_unit - (pdi->d.sect_off, pdi->is_dwz, - cu->per_cu->dwarf2_per_objfile); - - /* Go read the partial unit, if needed. */ - if (per_cu->v.psymtab == NULL) - process_psymtab_comp_unit (per_cu, 1, cu->language); - - cu->per_cu->imported_symtabs_push (per_cu); - } - break; - case DW_TAG_imported_declaration: - add_partial_symbol (pdi, cu); - break; - default: - break; - } - } - - /* If the die has a sibling, skip to the sibling. */ - - pdi = pdi->die_sibling; - } -} - -/* Functions used to compute the fully scoped name of a partial DIE. - - Normally, this is simple. For C++, the parent DIE's fully scoped - name is concatenated with "::" and the partial DIE's name. - Enumerators are an exception; they use the scope of their parent - enumeration type, i.e. the name of the enumeration type is not - prepended to the enumerator. - - There are two complexities. One is DW_AT_specification; in this - case "parent" means the parent of the target of the specification, - instead of the direct parent of the DIE. The other is compilers - which do not emit DW_TAG_namespace; in this case we try to guess - the fully qualified name of structure types from their members' - linkage names. This must be done using the DIE's children rather - than the children of any DW_AT_specification target. We only need - to do this for structures at the top level, i.e. if the target of - any DW_AT_specification (if any; otherwise the DIE itself) does not - have a parent. */ - -/* Compute the scope prefix associated with PDI's parent, in - compilation unit CU. The result will be allocated on CU's - comp_unit_obstack, or a copy of the already allocated PDI->NAME - field. NULL is returned if no prefix is necessary. */ -static const char * -partial_die_parent_scope (struct partial_die_info *pdi, - struct dwarf2_cu *cu) -{ - const char *grandparent_scope; - struct partial_die_info *parent, *real_pdi; - - /* We need to look at our parent DIE; if we have a DW_AT_specification, - then this means the parent of the specification DIE. */ - - real_pdi = pdi; - while (real_pdi->has_specification) - { - auto res = find_partial_die (real_pdi->spec_offset, - real_pdi->spec_is_dwz, cu); - real_pdi = res.pdi; - cu = res.cu; - } - - parent = real_pdi->die_parent; - if (parent == NULL) - return NULL; - - if (parent->scope_set) - return parent->scope; - - parent->fixup (cu); - - grandparent_scope = partial_die_parent_scope (parent, cu); - - /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus - DW_TAG_namespace DIEs with a name of "::" for the global namespace. - Work around this problem here. */ - if (cu->language == language_cplus - && parent->tag == DW_TAG_namespace - && strcmp (parent->name, "::") == 0 - && grandparent_scope == NULL) - { - parent->scope = NULL; - parent->scope_set = 1; - return NULL; - } - - /* Nested subroutines in Fortran get a prefix. */ - if (pdi->tag == DW_TAG_enumerator) - /* Enumerators should not get the name of the enumeration as a prefix. */ - parent->scope = grandparent_scope; - else if (parent->tag == DW_TAG_namespace - || parent->tag == DW_TAG_module - || parent->tag == DW_TAG_structure_type - || parent->tag == DW_TAG_class_type - || parent->tag == DW_TAG_interface_type - || parent->tag == DW_TAG_union_type - || parent->tag == DW_TAG_enumeration_type - || (cu->language == language_fortran - && parent->tag == DW_TAG_subprogram - && pdi->tag == DW_TAG_subprogram)) - { - if (grandparent_scope == NULL) - parent->scope = parent->name; - else - parent->scope = typename_concat (&cu->comp_unit_obstack, - grandparent_scope, - parent->name, 0, cu); - } - else - { - /* FIXME drow/2004-04-01: What should we be doing with - function-local names? For partial symbols, we should probably be - ignoring them. */ - complaint (_("unhandled containing DIE tag %s for DIE at %s"), - dwarf_tag_name (parent->tag), - sect_offset_str (pdi->sect_off)); - parent->scope = grandparent_scope; - } - - parent->scope_set = 1; - return parent->scope; -} - -/* Return the fully scoped name associated with PDI, from compilation unit - CU. The result will be allocated with malloc. */ - -static gdb::unique_xmalloc_ptr<char> -partial_die_full_name (struct partial_die_info *pdi, - struct dwarf2_cu *cu) -{ - const char *parent_scope; - - /* If this is a template instantiation, we can not work out the - template arguments from partial DIEs. So, unfortunately, we have - to go through the full DIEs. At least any work we do building - types here will be reused if full symbols are loaded later. */ - if (pdi->has_template_arguments) - { - pdi->fixup (cu); - - if (pdi->name != NULL && strchr (pdi->name, '<') == NULL) - { - struct die_info *die; - struct attribute attr; - struct dwarf2_cu *ref_cu = cu; - - /* DW_FORM_ref_addr is using section offset. */ - attr.name = (enum dwarf_attribute) 0; - attr.form = DW_FORM_ref_addr; - attr.u.unsnd = to_underlying (pdi->sect_off); - die = follow_die_ref (NULL, &attr, &ref_cu); - - return make_unique_xstrdup (dwarf2_full_name (NULL, die, ref_cu)); - } - } - - parent_scope = partial_die_parent_scope (pdi, cu); - if (parent_scope == NULL) - return NULL; - else - return gdb::unique_xmalloc_ptr<char> (typename_concat (NULL, parent_scope, - pdi->name, 0, cu)); -} - -static void -add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - struct objfile *objfile = dwarf2_per_objfile->objfile; - struct gdbarch *gdbarch = get_objfile_arch (objfile); - CORE_ADDR addr = 0; - const char *actual_name = NULL; - CORE_ADDR baseaddr; - - baseaddr = objfile->text_section_offset (); - - gdb::unique_xmalloc_ptr<char> built_actual_name - = partial_die_full_name (pdi, cu); - if (built_actual_name != NULL) - actual_name = built_actual_name.get (); - - if (actual_name == NULL) - actual_name = pdi->name; - - switch (pdi->tag) - { - case DW_TAG_inlined_subroutine: - case DW_TAG_subprogram: - addr = (gdbarch_adjust_dwarf2_addr (gdbarch, pdi->lowpc + baseaddr) - - baseaddr); - if (pdi->is_external - || cu->language == language_ada - || (cu->language == language_fortran - && pdi->die_parent != NULL - && pdi->die_parent->tag == DW_TAG_subprogram)) - { - /* Normally, only "external" DIEs are part of the global scope. - But in Ada and Fortran, we want to be able to access nested - procedures globally. So all Ada and Fortran subprograms are - stored in the global scope. */ - add_psymbol_to_list (actual_name, - built_actual_name != NULL, - VAR_DOMAIN, LOC_BLOCK, - SECT_OFF_TEXT (objfile), - psymbol_placement::GLOBAL, - addr, - cu->language, objfile); - } - else - { - add_psymbol_to_list (actual_name, - built_actual_name != NULL, - VAR_DOMAIN, LOC_BLOCK, - SECT_OFF_TEXT (objfile), - psymbol_placement::STATIC, - addr, cu->language, objfile); - } - - if (pdi->main_subprogram && actual_name != NULL) - set_objfile_main_name (objfile, actual_name, cu->language); - break; - case DW_TAG_constant: - add_psymbol_to_list (actual_name, - built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC, - -1, (pdi->is_external - ? psymbol_placement::GLOBAL - : psymbol_placement::STATIC), - 0, cu->language, objfile); - break; - case DW_TAG_variable: - if (pdi->d.locdesc) - addr = decode_locdesc (pdi->d.locdesc, cu); - - if (pdi->d.locdesc - && addr == 0 - && !dwarf2_per_objfile->has_section_at_zero) - { - /* A global or static variable may also have been stripped - out by the linker if unused, in which case its address - will be nullified; do not add such variables into partial - symbol table then. */ - } - else if (pdi->is_external) - { - /* Global Variable. - Don't enter into the minimal symbol tables as there is - a minimal symbol table entry from the ELF symbols already. - Enter into partial symbol table if it has a location - descriptor or a type. - If the location descriptor is missing, new_symbol will create - a LOC_UNRESOLVED symbol, the address of the variable will then - be determined from the minimal symbol table whenever the variable - is referenced. - The address for the partial symbol table entry is not - used by GDB, but it comes in handy for debugging partial symbol - table building. */ - - if (pdi->d.locdesc || pdi->has_type) - add_psymbol_to_list (actual_name, - built_actual_name != NULL, - VAR_DOMAIN, LOC_STATIC, - SECT_OFF_TEXT (objfile), - psymbol_placement::GLOBAL, - addr, cu->language, objfile); - } - else - { - int has_loc = pdi->d.locdesc != NULL; - - /* Static Variable. Skip symbols whose value we cannot know (those - without location descriptors or constant values). */ - if (!has_loc && !pdi->has_const_value) - return; - - add_psymbol_to_list (actual_name, - built_actual_name != NULL, - VAR_DOMAIN, LOC_STATIC, - SECT_OFF_TEXT (objfile), - psymbol_placement::STATIC, - has_loc ? addr : 0, - cu->language, objfile); - } - break; - case DW_TAG_typedef: - case DW_TAG_base_type: - case DW_TAG_subrange_type: - add_psymbol_to_list (actual_name, - built_actual_name != NULL, - VAR_DOMAIN, LOC_TYPEDEF, -1, - psymbol_placement::STATIC, - 0, cu->language, objfile); - break; - case DW_TAG_imported_declaration: - case DW_TAG_namespace: - add_psymbol_to_list (actual_name, - built_actual_name != NULL, - VAR_DOMAIN, LOC_TYPEDEF, -1, - psymbol_placement::GLOBAL, - 0, cu->language, objfile); - break; - case DW_TAG_module: - /* With Fortran 77 there might be a "BLOCK DATA" module - available without any name. If so, we skip the module as it - doesn't bring any value. */ - if (actual_name != nullptr) - add_psymbol_to_list (actual_name, - built_actual_name != NULL, - MODULE_DOMAIN, LOC_TYPEDEF, -1, - psymbol_placement::GLOBAL, - 0, cu->language, objfile); - break; - case DW_TAG_class_type: - case DW_TAG_interface_type: - case DW_TAG_structure_type: - case DW_TAG_union_type: - case DW_TAG_enumeration_type: - /* Skip external references. The DWARF standard says in the section - about "Structure, Union, and Class Type Entries": "An incomplete - structure, union or class type is represented by a structure, - union or class entry that does not have a byte size attribute - and that has a DW_AT_declaration attribute." */ - if (!pdi->has_byte_size && pdi->is_declaration) - return; - - /* NOTE: carlton/2003-10-07: See comment in new_symbol about - static vs. global. */ - add_psymbol_to_list (actual_name, - built_actual_name != NULL, - STRUCT_DOMAIN, LOC_TYPEDEF, -1, - cu->language == language_cplus - ? psymbol_placement::GLOBAL - : psymbol_placement::STATIC, - 0, cu->language, objfile); - - break; - case DW_TAG_enumerator: - add_psymbol_to_list (actual_name, - built_actual_name != NULL, - VAR_DOMAIN, LOC_CONST, -1, - cu->language == language_cplus - ? psymbol_placement::GLOBAL - : psymbol_placement::STATIC, - 0, cu->language, objfile); - break; - default: - break; - } -} - -/* Read a partial die corresponding to a namespace; also, add a symbol - corresponding to that namespace to the symbol table. NAMESPACE is - the name of the enclosing namespace. */ - -static void -add_partial_namespace (struct partial_die_info *pdi, - CORE_ADDR *lowpc, CORE_ADDR *highpc, - int set_addrmap, struct dwarf2_cu *cu) -{ - /* Add a symbol for the namespace. */ - - add_partial_symbol (pdi, cu); - - /* Now scan partial symbols in that namespace. */ - - if (pdi->has_children) - scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu); -} - -/* Read a partial die corresponding to a Fortran module. */ - -static void -add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc, - CORE_ADDR *highpc, int set_addrmap, struct dwarf2_cu *cu) -{ - /* Add a symbol for the namespace. */ - - add_partial_symbol (pdi, cu); - - /* Now scan partial symbols in that module. */ - - if (pdi->has_children) - scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu); -} - -/* Read a partial die corresponding to a subprogram or an inlined - subprogram and create a partial symbol for that subprogram. - When the CU language allows it, this routine also defines a partial - symbol for each nested subprogram that this subprogram contains. - If SET_ADDRMAP is true, record the covered ranges in the addrmap. - Set *LOWPC and *HIGHPC to the lowest and highest PC values found in PDI. - - PDI may also be a lexical block, in which case we simply search - recursively for subprograms defined inside that lexical block. - Again, this is only performed when the CU language allows this - type of definitions. */ - -static void -add_partial_subprogram (struct partial_die_info *pdi, - CORE_ADDR *lowpc, CORE_ADDR *highpc, - int set_addrmap, struct dwarf2_cu *cu) -{ - if (pdi->tag == DW_TAG_subprogram || pdi->tag == DW_TAG_inlined_subroutine) - { - if (pdi->has_pc_info) - { - if (pdi->lowpc < *lowpc) - *lowpc = pdi->lowpc; - if (pdi->highpc > *highpc) - *highpc = pdi->highpc; - if (set_addrmap) - { - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - struct gdbarch *gdbarch = get_objfile_arch (objfile); - CORE_ADDR baseaddr; - CORE_ADDR this_highpc; - CORE_ADDR this_lowpc; - - baseaddr = objfile->text_section_offset (); - this_lowpc - = (gdbarch_adjust_dwarf2_addr (gdbarch, - pdi->lowpc + baseaddr) - - baseaddr); - this_highpc - = (gdbarch_adjust_dwarf2_addr (gdbarch, - pdi->highpc + baseaddr) - - baseaddr); - addrmap_set_empty (objfile->partial_symtabs->psymtabs_addrmap, - this_lowpc, this_highpc - 1, - cu->per_cu->v.psymtab); - } - } - - if (pdi->has_pc_info || (!pdi->is_external && pdi->may_be_inlined)) - { - if (!pdi->is_declaration) - /* Ignore subprogram DIEs that do not have a name, they are - illegal. Do not emit a complaint at this point, we will - do so when we convert this psymtab into a symtab. */ - if (pdi->name) - add_partial_symbol (pdi, cu); - } - } - - if (! pdi->has_children) - return; - - if (cu->language == language_ada || cu->language == language_fortran) - { - pdi = pdi->die_child; - while (pdi != NULL) - { - pdi->fixup (cu); - if (pdi->tag == DW_TAG_subprogram - || pdi->tag == DW_TAG_inlined_subroutine - || pdi->tag == DW_TAG_lexical_block) - add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu); - pdi = pdi->die_sibling; - } - } -} - -/* Read a partial die corresponding to an enumeration type. */ - -static void -add_partial_enumeration (struct partial_die_info *enum_pdi, - struct dwarf2_cu *cu) -{ - struct partial_die_info *pdi; - - if (enum_pdi->name != NULL) - add_partial_symbol (enum_pdi, cu); - - pdi = enum_pdi->die_child; - while (pdi) - { - if (pdi->tag != DW_TAG_enumerator || pdi->name == NULL) - complaint (_("malformed enumerator DIE ignored")); - else - add_partial_symbol (pdi, cu); - pdi = pdi->die_sibling; - } -} - -/* Return the initial uleb128 in the die at INFO_PTR. */ - -static unsigned int -peek_abbrev_code (bfd *abfd, const gdb_byte *info_ptr) -{ - unsigned int bytes_read; - - return read_unsigned_leb128 (abfd, info_ptr, &bytes_read); -} - -/* Read the initial uleb128 in the die at INFO_PTR in compilation unit - READER::CU. Use READER::ABBREV_TABLE to lookup any abbreviation. - - Return the corresponding abbrev, or NULL if the number is zero (indicating - an empty DIE). In either case *BYTES_READ will be set to the length of - the initial number. */ - -static struct abbrev_info * -peek_die_abbrev (const die_reader_specs &reader, - const gdb_byte *info_ptr, unsigned int *bytes_read) -{ - dwarf2_cu *cu = reader.cu; - bfd *abfd = cu->per_cu->dwarf2_per_objfile->objfile->obfd; - unsigned int abbrev_number - = read_unsigned_leb128 (abfd, info_ptr, bytes_read); - - if (abbrev_number == 0) - return NULL; - - abbrev_info *abbrev = reader.abbrev_table->lookup_abbrev (abbrev_number); - if (!abbrev) - { - error (_("Dwarf Error: Could not find abbrev number %d in %s" - " at offset %s [in module %s]"), - abbrev_number, cu->per_cu->is_debug_types ? "TU" : "CU", - sect_offset_str (cu->header.sect_off), bfd_get_filename (abfd)); - } - - return abbrev; -} - -/* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER. - Returns a pointer to the end of a series of DIEs, terminated by an empty - DIE. Any children of the skipped DIEs will also be skipped. */ - -static const gdb_byte * -skip_children (const struct die_reader_specs *reader, const gdb_byte *info_ptr) -{ - while (1) - { - unsigned int bytes_read; - abbrev_info *abbrev = peek_die_abbrev (*reader, info_ptr, &bytes_read); - - if (abbrev == NULL) - return info_ptr + bytes_read; - else - info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev); - } -} - -/* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER. - INFO_PTR should point just after the initial uleb128 of a DIE, and the - abbrev corresponding to that skipped uleb128 should be passed in - ABBREV. Returns a pointer to this DIE's sibling, skipping any - children. */ - -static const gdb_byte * -skip_one_die (const struct die_reader_specs *reader, const gdb_byte *info_ptr, - struct abbrev_info *abbrev) -{ - unsigned int bytes_read; - struct attribute attr; - bfd *abfd = reader->abfd; - struct dwarf2_cu *cu = reader->cu; - const gdb_byte *buffer = reader->buffer; - const gdb_byte *buffer_end = reader->buffer_end; - unsigned int form, i; - - for (i = 0; i < abbrev->num_attrs; i++) - { - /* The only abbrev we care about is DW_AT_sibling. */ - if (abbrev->attrs[i].name == DW_AT_sibling) - { - bool ignored; - read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr, - &ignored); - if (attr.form == DW_FORM_ref_addr) - complaint (_("ignoring absolute DW_AT_sibling")); - else - { - sect_offset off = dwarf2_get_ref_die_offset (&attr); - const gdb_byte *sibling_ptr = buffer + to_underlying (off); - - if (sibling_ptr < info_ptr) - complaint (_("DW_AT_sibling points backwards")); - else if (sibling_ptr > reader->buffer_end) - dwarf2_section_buffer_overflow_complaint (reader->die_section); - else - return sibling_ptr; - } - } - - /* If it isn't DW_AT_sibling, skip this attribute. */ - form = abbrev->attrs[i].form; - skip_attribute: - switch (form) - { - case DW_FORM_ref_addr: - /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3 - and later it is offset sized. */ - if (cu->header.version == 2) - info_ptr += cu->header.addr_size; - else - info_ptr += cu->header.offset_size; - break; - case DW_FORM_GNU_ref_alt: - info_ptr += cu->header.offset_size; - break; - case DW_FORM_addr: - info_ptr += cu->header.addr_size; - break; - case DW_FORM_data1: - case DW_FORM_ref1: - case DW_FORM_flag: - case DW_FORM_strx1: - info_ptr += 1; - break; - case DW_FORM_flag_present: - case DW_FORM_implicit_const: - break; - case DW_FORM_data2: - case DW_FORM_ref2: - case DW_FORM_strx2: - info_ptr += 2; - break; - case DW_FORM_strx3: - info_ptr += 3; - break; - case DW_FORM_data4: - case DW_FORM_ref4: - case DW_FORM_strx4: - info_ptr += 4; - break; - case DW_FORM_data8: - case DW_FORM_ref8: - case DW_FORM_ref_sig8: - info_ptr += 8; - break; - case DW_FORM_data16: - info_ptr += 16; - break; - case DW_FORM_string: - read_direct_string (abfd, info_ptr, &bytes_read); - info_ptr += bytes_read; - break; - case DW_FORM_sec_offset: - case DW_FORM_strp: - case DW_FORM_GNU_strp_alt: - info_ptr += cu->header.offset_size; - break; - case DW_FORM_exprloc: - case DW_FORM_block: - info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read); - info_ptr += bytes_read; - break; - case DW_FORM_block1: - info_ptr += 1 + read_1_byte (abfd, info_ptr); - break; - case DW_FORM_block2: - info_ptr += 2 + read_2_bytes (abfd, info_ptr); - break; - case DW_FORM_block4: - info_ptr += 4 + read_4_bytes (abfd, info_ptr); - break; - case DW_FORM_addrx: - case DW_FORM_strx: - case DW_FORM_sdata: - case DW_FORM_udata: - case DW_FORM_ref_udata: - case DW_FORM_GNU_addr_index: - case DW_FORM_GNU_str_index: - case DW_FORM_rnglistx: - info_ptr = safe_skip_leb128 (info_ptr, buffer_end); - break; - case DW_FORM_indirect: - form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); - info_ptr += bytes_read; - /* We need to continue parsing from here, so just go back to - the top. */ - goto skip_attribute; - - default: - error (_("Dwarf Error: Cannot handle %s " - "in DWARF reader [in module %s]"), - dwarf_form_name (form), - bfd_get_filename (abfd)); - } - } - - if (abbrev->has_children) - return skip_children (reader, info_ptr); - else - return info_ptr; -} - -/* Locate ORIG_PDI's sibling. - INFO_PTR should point to the start of the next DIE after ORIG_PDI. */ - -static const gdb_byte * -locate_pdi_sibling (const struct die_reader_specs *reader, - struct partial_die_info *orig_pdi, - const gdb_byte *info_ptr) -{ - /* Do we know the sibling already? */ - - if (orig_pdi->sibling) - return orig_pdi->sibling; - - /* Are there any children to deal with? */ - - if (!orig_pdi->has_children) - return info_ptr; - - /* Skip the children the long way. */ - - return skip_children (reader, info_ptr); -} - -/* Expand this partial symbol table into a full symbol table. SELF is - not NULL. */ - -void -dwarf2_psymtab::read_symtab (struct objfile *objfile) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = get_dwarf2_per_objfile (objfile); - - gdb_assert (!readin); - /* If this psymtab is constructed from a debug-only objfile, the - has_section_at_zero flag will not necessarily be correct. We - can get the correct value for this flag by looking at the data - associated with the (presumably stripped) associated objfile. */ - if (objfile->separate_debug_objfile_backlink) - { - struct dwarf2_per_objfile *dpo_backlink - = get_dwarf2_per_objfile (objfile->separate_debug_objfile_backlink); - - dwarf2_per_objfile->has_section_at_zero - = dpo_backlink->has_section_at_zero; - } - - dwarf2_per_objfile->reading_partial_symbols = 0; - - expand_psymtab (objfile); - - process_cu_includes (dwarf2_per_objfile); -} - -/* Reading in full CUs. */ - -/* Add PER_CU to the queue. */ - -static void -queue_comp_unit (struct dwarf2_per_cu_data *per_cu, - enum language pretend_language) -{ - struct dwarf2_queue_item *item; - - per_cu->queued = 1; - item = XNEW (struct dwarf2_queue_item); - item->per_cu = per_cu; - item->pretend_language = pretend_language; - item->next = NULL; - - if (dwarf2_queue == NULL) - dwarf2_queue = item; - else - dwarf2_queue_tail->next = item; - - dwarf2_queue_tail = item; -} - -/* If PER_CU is not yet queued, add it to the queue. - If DEPENDENT_CU is non-NULL, it has a reference to PER_CU so add a - dependency. - The result is non-zero if PER_CU was queued, otherwise the result is zero - meaning either PER_CU is already queued or it is already loaded. - - N.B. There is an invariant here that if a CU is queued then it is loaded. - The caller is required to load PER_CU if we return non-zero. */ - -static int -maybe_queue_comp_unit (struct dwarf2_cu *dependent_cu, - struct dwarf2_per_cu_data *per_cu, - enum language pretend_language) -{ - /* We may arrive here during partial symbol reading, if we need full - DIEs to process an unusual case (e.g. template arguments). Do - not queue PER_CU, just tell our caller to load its DIEs. */ - if (per_cu->dwarf2_per_objfile->reading_partial_symbols) - { - if (per_cu->cu == NULL || per_cu->cu->dies == NULL) - return 1; - return 0; - } - - /* Mark the dependence relation so that we don't flush PER_CU - too early. */ - if (dependent_cu != NULL) - dwarf2_add_dependence (dependent_cu, per_cu); - - /* If it's already on the queue, we have nothing to do. */ - if (per_cu->queued) - return 0; - - /* If the compilation unit is already loaded, just mark it as - used. */ - if (per_cu->cu != NULL) - { - per_cu->cu->last_used = 0; - return 0; - } - - /* Add it to the queue. */ - queue_comp_unit (per_cu, pretend_language); - - return 1; -} - -/* Process the queue. */ - -static void -process_queue (struct dwarf2_per_objfile *dwarf2_per_objfile) -{ - struct dwarf2_queue_item *item, *next_item; - - if (dwarf_read_debug) - { - fprintf_unfiltered (gdb_stdlog, - "Expanding one or more symtabs of objfile %s ...\n", - objfile_name (dwarf2_per_objfile->objfile)); - } - - /* The queue starts out with one item, but following a DIE reference - may load a new CU, adding it to the end of the queue. */ - for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item) - { - if ((dwarf2_per_objfile->using_index - ? !item->per_cu->v.quick->compunit_symtab - : (item->per_cu->v.psymtab && !item->per_cu->v.psymtab->readin)) - /* Skip dummy CUs. */ - && item->per_cu->cu != NULL) - { - struct dwarf2_per_cu_data *per_cu = item->per_cu; - unsigned int debug_print_threshold; - char buf[100]; - - if (per_cu->is_debug_types) - { - struct signatured_type *sig_type = - (struct signatured_type *) per_cu; - - sprintf (buf, "TU %s at offset %s", - hex_string (sig_type->signature), - sect_offset_str (per_cu->sect_off)); - /* There can be 100s of TUs. - Only print them in verbose mode. */ - debug_print_threshold = 2; - } - else - { - sprintf (buf, "CU at offset %s", - sect_offset_str (per_cu->sect_off)); - debug_print_threshold = 1; - } - - if (dwarf_read_debug >= debug_print_threshold) - fprintf_unfiltered (gdb_stdlog, "Expanding symtab of %s\n", buf); - - if (per_cu->is_debug_types) - process_full_type_unit (per_cu, item->pretend_language); - else - process_full_comp_unit (per_cu, item->pretend_language); - - if (dwarf_read_debug >= debug_print_threshold) - fprintf_unfiltered (gdb_stdlog, "Done expanding %s\n", buf); - } - - item->per_cu->queued = 0; - next_item = item->next; - xfree (item); - } - - dwarf2_queue_tail = NULL; - - if (dwarf_read_debug) - { - fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n", - objfile_name (dwarf2_per_objfile->objfile)); - } -} - -/* Read in full symbols for PST, and anything it depends on. */ - -void -dwarf2_psymtab::expand_psymtab (struct objfile *objfile) -{ - struct dwarf2_per_cu_data *per_cu; - - if (readin) - return; - - read_dependencies (objfile); - - per_cu = per_cu_data; - - if (per_cu == NULL) - { - /* It's an include file, no symbols to read for it. - Everything is in the parent symtab. */ - readin = true; - return; - } - - dw2_do_instantiate_symtab (per_cu, false); -} - -/* Trivial hash function for die_info: the hash value of a DIE - is its offset in .debug_info for this objfile. */ - -static hashval_t -die_hash (const void *item) -{ - const struct die_info *die = (const struct die_info *) item; - - return to_underlying (die->sect_off); -} - -/* Trivial comparison function for die_info structures: two DIEs - are equal if they have the same offset. */ - -static int -die_eq (const void *item_lhs, const void *item_rhs) -{ - const struct die_info *die_lhs = (const struct die_info *) item_lhs; - const struct die_info *die_rhs = (const struct die_info *) item_rhs; - - return die_lhs->sect_off == die_rhs->sect_off; -} - -/* Load the DIEs associated with PER_CU into memory. */ - -static void -load_full_comp_unit (struct dwarf2_per_cu_data *this_cu, - bool skip_partial, - enum language pretend_language) -{ - gdb_assert (! this_cu->is_debug_types); - - cutu_reader reader (this_cu, NULL, 1, 1, skip_partial); - if (reader.dummy_p) - return; - - struct dwarf2_cu *cu = reader.cu; - const gdb_byte *info_ptr = reader.info_ptr; - - gdb_assert (cu->die_hash == NULL); - cu->die_hash = - htab_create_alloc_ex (cu->header.length / 12, - die_hash, - die_eq, - NULL, - &cu->comp_unit_obstack, - hashtab_obstack_allocate, - dummy_obstack_deallocate); - - if (reader.has_children) - reader.comp_unit_die->child - = read_die_and_siblings (&reader, reader.info_ptr, - &info_ptr, reader.comp_unit_die); - cu->dies = reader.comp_unit_die; - /* comp_unit_die is not stored in die_hash, no need. */ - - /* We try not to read any attributes in this function, because not - all CUs needed for references have been loaded yet, and symbol - table processing isn't initialized. But we have to set the CU language, - or we won't be able to build types correctly. - Similarly, if we do not read the producer, we can not apply - producer-specific interpretation. */ - prepare_one_comp_unit (cu, cu->dies, pretend_language); -} - -/* Add a DIE to the delayed physname list. */ - -static void -add_to_method_list (struct type *type, int fnfield_index, int index, - const char *name, struct die_info *die, - struct dwarf2_cu *cu) -{ - struct delayed_method_info mi; - mi.type = type; - mi.fnfield_index = fnfield_index; - mi.index = index; - mi.name = name; - mi.die = die; - cu->method_list.push_back (mi); -} - -/* Check whether [PHYSNAME, PHYSNAME+LEN) ends with a modifier like - "const" / "volatile". If so, decrements LEN by the length of the - modifier and return true. Otherwise return false. */ - -template<size_t N> -static bool -check_modifier (const char *physname, size_t &len, const char (&mod)[N]) -{ - size_t mod_len = sizeof (mod) - 1; - if (len > mod_len && startswith (physname + (len - mod_len), mod)) - { - len -= mod_len; - return true; - } - return false; -} - -/* Compute the physnames of any methods on the CU's method list. - - The computation of method physnames is delayed in order to avoid the - (bad) condition that one of the method's formal parameters is of an as yet - incomplete type. */ - -static void -compute_delayed_physnames (struct dwarf2_cu *cu) -{ - /* Only C++ delays computing physnames. */ - if (cu->method_list.empty ()) - return; - gdb_assert (cu->language == language_cplus); - - for (const delayed_method_info &mi : cu->method_list) - { - const char *physname; - struct fn_fieldlist *fn_flp - = &TYPE_FN_FIELDLIST (mi.type, mi.fnfield_index); - physname = dwarf2_physname (mi.name, mi.die, cu); - TYPE_FN_FIELD_PHYSNAME (fn_flp->fn_fields, mi.index) - = physname ? physname : ""; - - /* Since there's no tag to indicate whether a method is a - const/volatile overload, extract that information out of the - demangled name. */ - if (physname != NULL) - { - size_t len = strlen (physname); - - while (1) - { - if (physname[len] == ')') /* shortcut */ - break; - else if (check_modifier (physname, len, " const")) - TYPE_FN_FIELD_CONST (fn_flp->fn_fields, mi.index) = 1; - else if (check_modifier (physname, len, " volatile")) - TYPE_FN_FIELD_VOLATILE (fn_flp->fn_fields, mi.index) = 1; - else - break; - } - } - } - - /* The list is no longer needed. */ - cu->method_list.clear (); -} - -/* Go objects should be embedded in a DW_TAG_module DIE, - and it's not clear if/how imported objects will appear. - To keep Go support simple until that's worked out, - go back through what we've read and create something usable. - We could do this while processing each DIE, and feels kinda cleaner, - but that way is more invasive. - This is to, for example, allow the user to type "p var" or "b main" - without having to specify the package name, and allow lookups - of module.object to work in contexts that use the expression - parser. */ - -static void -fixup_go_packaging (struct dwarf2_cu *cu) -{ - gdb::unique_xmalloc_ptr<char> package_name; - struct pending *list; - int i; - - for (list = *cu->get_builder ()->get_global_symbols (); - list != NULL; - list = list->next) - { - for (i = 0; i < list->nsyms; ++i) - { - struct symbol *sym = list->symbol[i]; - - if (sym->language () == language_go - && SYMBOL_CLASS (sym) == LOC_BLOCK) - { - gdb::unique_xmalloc_ptr<char> this_package_name - (go_symbol_package_name (sym)); - - if (this_package_name == NULL) - continue; - if (package_name == NULL) - package_name = std::move (this_package_name); - else - { - struct objfile *objfile - = cu->per_cu->dwarf2_per_objfile->objfile; - if (strcmp (package_name.get (), this_package_name.get ()) != 0) - complaint (_("Symtab %s has objects from two different Go packages: %s and %s"), - (symbol_symtab (sym) != NULL - ? symtab_to_filename_for_display - (symbol_symtab (sym)) - : objfile_name (objfile)), - this_package_name.get (), package_name.get ()); - } - } - } - } - - if (package_name != NULL) - { - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - const char *saved_package_name - = obstack_strdup (&objfile->per_bfd->storage_obstack, package_name.get ()); - struct type *type = init_type (objfile, TYPE_CODE_MODULE, 0, - saved_package_name); - struct symbol *sym; - - sym = allocate_symbol (objfile); - sym->set_language (language_go, &objfile->objfile_obstack); - sym->compute_and_set_names (saved_package_name, false, objfile->per_bfd); - /* This is not VAR_DOMAIN because we want a way to ensure a lookup of, - e.g., "main" finds the "main" module and not C's main(). */ - SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN; - SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF; - SYMBOL_TYPE (sym) = type; - - add_symbol_to_list (sym, cu->get_builder ()->get_global_symbols ()); - } -} - -/* Allocate a fully-qualified name consisting of the two parts on the - obstack. */ - -static const char * -rust_fully_qualify (struct obstack *obstack, const char *p1, const char *p2) -{ - return obconcat (obstack, p1, "::", p2, (char *) NULL); -} - -/* A helper that allocates a struct discriminant_info to attach to a - union type. */ - -static struct discriminant_info * -alloc_discriminant_info (struct type *type, int discriminant_index, - int default_index) -{ - gdb_assert (TYPE_CODE (type) == TYPE_CODE_UNION); - gdb_assert (discriminant_index == -1 - || (discriminant_index >= 0 - && discriminant_index < TYPE_NFIELDS (type))); - gdb_assert (default_index == -1 - || (default_index >= 0 && default_index < TYPE_NFIELDS (type))); - - TYPE_FLAG_DISCRIMINATED_UNION (type) = 1; - - struct discriminant_info *disc - = ((struct discriminant_info *) - TYPE_ZALLOC (type, - offsetof (struct discriminant_info, discriminants) - + TYPE_NFIELDS (type) * sizeof (disc->discriminants[0]))); - disc->default_index = default_index; - disc->discriminant_index = discriminant_index; - - struct dynamic_prop prop; - prop.kind = PROP_UNDEFINED; - prop.data.baton = disc; - - add_dyn_prop (DYN_PROP_DISCRIMINATED, prop, type); - - return disc; -} - -/* Some versions of rustc emitted enums in an unusual way. - - Ordinary enums were emitted as unions. The first element of each - structure in the union was named "RUST$ENUM$DISR". This element - held the discriminant. - - These versions of Rust also implemented the "non-zero" - optimization. When the enum had two values, and one is empty and - the other holds a pointer that cannot be zero, the pointer is used - as the discriminant, with a zero value meaning the empty variant. - Here, the union's first member is of the form - RUST$ENCODED$ENUM$<fieldno>$<fieldno>$...$<variantname> - where the fieldnos are the indices of the fields that should be - traversed in order to find the field (which may be several fields deep) - and the variantname is the name of the variant of the case when the - field is zero. - - This function recognizes whether TYPE is of one of these forms, - and, if so, smashes it to be a variant type. */ - -static void -quirk_rust_enum (struct type *type, struct objfile *objfile) -{ - gdb_assert (TYPE_CODE (type) == TYPE_CODE_UNION); - - /* We don't need to deal with empty enums. */ - if (TYPE_NFIELDS (type) == 0) - return; - -#define RUST_ENUM_PREFIX "RUST$ENCODED$ENUM$" - if (TYPE_NFIELDS (type) == 1 - && startswith (TYPE_FIELD_NAME (type, 0), RUST_ENUM_PREFIX)) - { - const char *name = TYPE_FIELD_NAME (type, 0) + strlen (RUST_ENUM_PREFIX); - - /* Decode the field name to find the offset of the - discriminant. */ - ULONGEST bit_offset = 0; - struct type *field_type = TYPE_FIELD_TYPE (type, 0); - while (name[0] >= '0' && name[0] <= '9') - { - char *tail; - unsigned long index = strtoul (name, &tail, 10); - name = tail; - if (*name != '$' - || index >= TYPE_NFIELDS (field_type) - || (TYPE_FIELD_LOC_KIND (field_type, index) - != FIELD_LOC_KIND_BITPOS)) - { - complaint (_("Could not parse Rust enum encoding string \"%s\"" - "[in module %s]"), - TYPE_FIELD_NAME (type, 0), - objfile_name (objfile)); - return; - } - ++name; - - bit_offset += TYPE_FIELD_BITPOS (field_type, index); - field_type = TYPE_FIELD_TYPE (field_type, index); - } - - /* Make a union to hold the variants. */ - struct type *union_type = alloc_type (objfile); - TYPE_CODE (union_type) = TYPE_CODE_UNION; - TYPE_NFIELDS (union_type) = 3; - TYPE_FIELDS (union_type) - = (struct field *) TYPE_ZALLOC (type, 3 * sizeof (struct field)); - TYPE_LENGTH (union_type) = TYPE_LENGTH (type); - set_type_align (union_type, TYPE_RAW_ALIGN (type)); - - /* Put the discriminant must at index 0. */ - TYPE_FIELD_TYPE (union_type, 0) = field_type; - TYPE_FIELD_ARTIFICIAL (union_type, 0) = 1; - TYPE_FIELD_NAME (union_type, 0) = "<<discriminant>>"; - SET_FIELD_BITPOS (TYPE_FIELD (union_type, 0), bit_offset); - - /* The order of fields doesn't really matter, so put the real - field at index 1 and the data-less field at index 2. */ - struct discriminant_info *disc - = alloc_discriminant_info (union_type, 0, 1); - TYPE_FIELD (union_type, 1) = TYPE_FIELD (type, 0); - TYPE_FIELD_NAME (union_type, 1) - = rust_last_path_segment (TYPE_NAME (TYPE_FIELD_TYPE (union_type, 1))); - TYPE_NAME (TYPE_FIELD_TYPE (union_type, 1)) - = rust_fully_qualify (&objfile->objfile_obstack, TYPE_NAME (type), - TYPE_FIELD_NAME (union_type, 1)); - - const char *dataless_name - = rust_fully_qualify (&objfile->objfile_obstack, TYPE_NAME (type), - name); - struct type *dataless_type = init_type (objfile, TYPE_CODE_VOID, 0, - dataless_name); - TYPE_FIELD_TYPE (union_type, 2) = dataless_type; - /* NAME points into the original discriminant name, which - already has the correct lifetime. */ - TYPE_FIELD_NAME (union_type, 2) = name; - SET_FIELD_BITPOS (TYPE_FIELD (union_type, 2), 0); - disc->discriminants[2] = 0; - - /* Smash this type to be a structure type. We have to do this - because the type has already been recorded. */ - TYPE_CODE (type) = TYPE_CODE_STRUCT; - TYPE_NFIELDS (type) = 1; - TYPE_FIELDS (type) - = (struct field *) TYPE_ZALLOC (type, sizeof (struct field)); - - /* Install the variant part. */ - TYPE_FIELD_TYPE (type, 0) = union_type; - SET_FIELD_BITPOS (TYPE_FIELD (type, 0), 0); - TYPE_FIELD_NAME (type, 0) = "<<variants>>"; - } - /* A union with a single anonymous field is probably an old-style - univariant enum. */ - else if (TYPE_NFIELDS (type) == 1 && streq (TYPE_FIELD_NAME (type, 0), "")) - { - /* Smash this type to be a structure type. We have to do this - because the type has already been recorded. */ - TYPE_CODE (type) = TYPE_CODE_STRUCT; - - /* Make a union to hold the variants. */ - struct type *union_type = alloc_type (objfile); - TYPE_CODE (union_type) = TYPE_CODE_UNION; - TYPE_NFIELDS (union_type) = TYPE_NFIELDS (type); - TYPE_LENGTH (union_type) = TYPE_LENGTH (type); - set_type_align (union_type, TYPE_RAW_ALIGN (type)); - TYPE_FIELDS (union_type) = TYPE_FIELDS (type); - - struct type *field_type = TYPE_FIELD_TYPE (union_type, 0); - const char *variant_name - = rust_last_path_segment (TYPE_NAME (field_type)); - TYPE_FIELD_NAME (union_type, 0) = variant_name; - TYPE_NAME (field_type) - = rust_fully_qualify (&objfile->objfile_obstack, - TYPE_NAME (type), variant_name); - - /* Install the union in the outer struct type. */ - TYPE_NFIELDS (type) = 1; - TYPE_FIELDS (type) - = (struct field *) TYPE_ZALLOC (union_type, sizeof (struct field)); - TYPE_FIELD_TYPE (type, 0) = union_type; - TYPE_FIELD_NAME (type, 0) = "<<variants>>"; - SET_FIELD_BITPOS (TYPE_FIELD (type, 0), 0); - - alloc_discriminant_info (union_type, -1, 0); - } - else - { - struct type *disr_type = nullptr; - for (int i = 0; i < TYPE_NFIELDS (type); ++i) - { - disr_type = TYPE_FIELD_TYPE (type, i); - - if (TYPE_CODE (disr_type) != TYPE_CODE_STRUCT) - { - /* All fields of a true enum will be structs. */ - return; - } - else if (TYPE_NFIELDS (disr_type) == 0) - { - /* Could be data-less variant, so keep going. */ - disr_type = nullptr; - } - else if (strcmp (TYPE_FIELD_NAME (disr_type, 0), - "RUST$ENUM$DISR") != 0) - { - /* Not a Rust enum. */ - return; - } - else - { - /* Found one. */ - break; - } - } - - /* If we got here without a discriminant, then it's probably - just a union. */ - if (disr_type == nullptr) - return; - - /* Smash this type to be a structure type. We have to do this - because the type has already been recorded. */ - TYPE_CODE (type) = TYPE_CODE_STRUCT; - - /* Make a union to hold the variants. */ - struct field *disr_field = &TYPE_FIELD (disr_type, 0); - struct type *union_type = alloc_type (objfile); - TYPE_CODE (union_type) = TYPE_CODE_UNION; - TYPE_NFIELDS (union_type) = 1 + TYPE_NFIELDS (type); - TYPE_LENGTH (union_type) = TYPE_LENGTH (type); - set_type_align (union_type, TYPE_RAW_ALIGN (type)); - TYPE_FIELDS (union_type) - = (struct field *) TYPE_ZALLOC (union_type, - (TYPE_NFIELDS (union_type) - * sizeof (struct field))); - - memcpy (TYPE_FIELDS (union_type) + 1, TYPE_FIELDS (type), - TYPE_NFIELDS (type) * sizeof (struct field)); - - /* Install the discriminant at index 0 in the union. */ - TYPE_FIELD (union_type, 0) = *disr_field; - TYPE_FIELD_ARTIFICIAL (union_type, 0) = 1; - TYPE_FIELD_NAME (union_type, 0) = "<<discriminant>>"; - - /* Install the union in the outer struct type. */ - TYPE_FIELD_TYPE (type, 0) = union_type; - TYPE_FIELD_NAME (type, 0) = "<<variants>>"; - TYPE_NFIELDS (type) = 1; - - /* Set the size and offset of the union type. */ - SET_FIELD_BITPOS (TYPE_FIELD (type, 0), 0); - - /* We need a way to find the correct discriminant given a - variant name. For convenience we build a map here. */ - struct type *enum_type = FIELD_TYPE (*disr_field); - std::unordered_map<std::string, ULONGEST> discriminant_map; - for (int i = 0; i < TYPE_NFIELDS (enum_type); ++i) - { - if (TYPE_FIELD_LOC_KIND (enum_type, i) == FIELD_LOC_KIND_ENUMVAL) - { - const char *name - = rust_last_path_segment (TYPE_FIELD_NAME (enum_type, i)); - discriminant_map[name] = TYPE_FIELD_ENUMVAL (enum_type, i); - } - } - - int n_fields = TYPE_NFIELDS (union_type); - struct discriminant_info *disc - = alloc_discriminant_info (union_type, 0, -1); - /* Skip the discriminant here. */ - for (int i = 1; i < n_fields; ++i) - { - /* Find the final word in the name of this variant's type. - That name can be used to look up the correct - discriminant. */ - const char *variant_name - = rust_last_path_segment (TYPE_NAME (TYPE_FIELD_TYPE (union_type, - i))); - - auto iter = discriminant_map.find (variant_name); - if (iter != discriminant_map.end ()) - disc->discriminants[i] = iter->second; - - /* Remove the discriminant field, if it exists. */ - struct type *sub_type = TYPE_FIELD_TYPE (union_type, i); - if (TYPE_NFIELDS (sub_type) > 0) - { - --TYPE_NFIELDS (sub_type); - ++TYPE_FIELDS (sub_type); - } - TYPE_FIELD_NAME (union_type, i) = variant_name; - TYPE_NAME (sub_type) - = rust_fully_qualify (&objfile->objfile_obstack, - TYPE_NAME (type), variant_name); - } - } -} - -/* Rewrite some Rust unions to be structures with variants parts. */ - -static void -rust_union_quirks (struct dwarf2_cu *cu) -{ - gdb_assert (cu->language == language_rust); - for (type *type_ : cu->rust_unions) - quirk_rust_enum (type_, cu->per_cu->dwarf2_per_objfile->objfile); - /* We don't need this any more. */ - cu->rust_unions.clear (); -} - -/* Return the symtab for PER_CU. This works properly regardless of - whether we're using the index or psymtabs. */ - -static struct compunit_symtab * -get_compunit_symtab (struct dwarf2_per_cu_data *per_cu) -{ - return (per_cu->dwarf2_per_objfile->using_index - ? per_cu->v.quick->compunit_symtab - : per_cu->v.psymtab->compunit_symtab); -} - -/* A helper function for computing the list of all symbol tables - included by PER_CU. */ - -static void -recursively_compute_inclusions (std::vector<compunit_symtab *> *result, - htab_t all_children, htab_t all_type_symtabs, - struct dwarf2_per_cu_data *per_cu, - struct compunit_symtab *immediate_parent) -{ - void **slot; - struct compunit_symtab *cust; - - slot = htab_find_slot (all_children, per_cu, INSERT); - if (*slot != NULL) - { - /* This inclusion and its children have been processed. */ - return; - } - - *slot = per_cu; - /* Only add a CU if it has a symbol table. */ - cust = get_compunit_symtab (per_cu); - if (cust != NULL) - { - /* If this is a type unit only add its symbol table if we haven't - seen it yet (type unit per_cu's can share symtabs). */ - if (per_cu->is_debug_types) - { - slot = htab_find_slot (all_type_symtabs, cust, INSERT); - if (*slot == NULL) - { - *slot = cust; - result->push_back (cust); - if (cust->user == NULL) - cust->user = immediate_parent; - } - } - else - { - result->push_back (cust); - if (cust->user == NULL) - cust->user = immediate_parent; - } - } - - if (!per_cu->imported_symtabs_empty ()) - for (dwarf2_per_cu_data *ptr : *per_cu->imported_symtabs) - { - recursively_compute_inclusions (result, all_children, - all_type_symtabs, ptr, cust); - } -} - -/* Compute the compunit_symtab 'includes' fields for the compunit_symtab of - PER_CU. */ - -static void -compute_compunit_symtab_includes (struct dwarf2_per_cu_data *per_cu) -{ - gdb_assert (! per_cu->is_debug_types); - - if (!per_cu->imported_symtabs_empty ()) - { - int len; - std::vector<compunit_symtab *> result_symtabs; - htab_t all_children, all_type_symtabs; - struct compunit_symtab *cust = get_compunit_symtab (per_cu); - - /* If we don't have a symtab, we can just skip this case. */ - if (cust == NULL) - return; - - all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer, - NULL, xcalloc, xfree); - all_type_symtabs = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer, - NULL, xcalloc, xfree); - - for (dwarf2_per_cu_data *ptr : *per_cu->imported_symtabs) - { - recursively_compute_inclusions (&result_symtabs, all_children, - all_type_symtabs, ptr, cust); - } - - /* Now we have a transitive closure of all the included symtabs. */ - len = result_symtabs.size (); - cust->includes - = XOBNEWVEC (&per_cu->dwarf2_per_objfile->objfile->objfile_obstack, - struct compunit_symtab *, len + 1); - memcpy (cust->includes, result_symtabs.data (), - len * sizeof (compunit_symtab *)); - cust->includes[len] = NULL; - - htab_delete (all_children); - htab_delete (all_type_symtabs); - } -} - -/* Compute the 'includes' field for the symtabs of all the CUs we just - read. */ - -static void -process_cu_includes (struct dwarf2_per_objfile *dwarf2_per_objfile) -{ - for (dwarf2_per_cu_data *iter : dwarf2_per_objfile->just_read_cus) - { - if (! iter->is_debug_types) - compute_compunit_symtab_includes (iter); - } - - dwarf2_per_objfile->just_read_cus.clear (); -} - -/* Generate full symbol information for PER_CU, whose DIEs have - already been loaded into memory. */ - -static void -process_full_comp_unit (struct dwarf2_per_cu_data *per_cu, - enum language pretend_language) -{ - struct dwarf2_cu *cu = per_cu->cu; - struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile; - struct objfile *objfile = dwarf2_per_objfile->objfile; - struct gdbarch *gdbarch = get_objfile_arch (objfile); - CORE_ADDR lowpc, highpc; - struct compunit_symtab *cust; - CORE_ADDR baseaddr; - struct block *static_block; - CORE_ADDR addr; - - baseaddr = objfile->text_section_offset (); - - /* Clear the list here in case something was left over. */ - cu->method_list.clear (); - - cu->language = pretend_language; - cu->language_defn = language_def (cu->language); - - /* Do line number decoding in read_file_scope () */ - process_die (cu->dies, cu); - - /* For now fudge the Go package. */ - if (cu->language == language_go) - fixup_go_packaging (cu); - - /* Now that we have processed all the DIEs in the CU, all the types - should be complete, and it should now be safe to compute all of the - physnames. */ - compute_delayed_physnames (cu); - - if (cu->language == language_rust) - rust_union_quirks (cu); - - /* Some compilers don't define a DW_AT_high_pc attribute for the - compilation unit. If the DW_AT_high_pc is missing, synthesize - it, by scanning the DIE's below the compilation unit. */ - get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu); - - addr = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr); - static_block = cu->get_builder ()->end_symtab_get_static_block (addr, 0, 1); - - /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges. - Also, DW_AT_ranges may record ranges not belonging to any child DIEs - (such as virtual method tables). Record the ranges in STATIC_BLOCK's - addrmap to help ensure it has an accurate map of pc values belonging to - this comp unit. */ - dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu); - - cust = cu->get_builder ()->end_symtab_from_static_block (static_block, - SECT_OFF_TEXT (objfile), - 0); - - if (cust != NULL) - { - int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer); - - /* Set symtab language to language from DW_AT_language. If the - compilation is from a C file generated by language preprocessors, do - not set the language if it was already deduced by start_subfile. */ - if (!(cu->language == language_c - && COMPUNIT_FILETABS (cust)->language != language_unknown)) - COMPUNIT_FILETABS (cust)->language = cu->language; - - /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can - produce DW_AT_location with location lists but it can be possibly - invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0 - there were bugs in prologue debug info, fixed later in GCC-4.5 - by "unwind info for epilogues" patch (which is not directly related). - - For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not - needed, it would be wrong due to missing DW_AT_producer there. - - Still one can confuse GDB by using non-standard GCC compilation - options - this waits on GCC PR other/32998 (-frecord-gcc-switches). - */ - if (cu->has_loclist && gcc_4_minor >= 5) - cust->locations_valid = 1; - - if (gcc_4_minor >= 5) - cust->epilogue_unwind_valid = 1; - - cust->call_site_htab = cu->call_site_htab; - } - - if (dwarf2_per_objfile->using_index) - per_cu->v.quick->compunit_symtab = cust; - else - { - dwarf2_psymtab *pst = per_cu->v.psymtab; - pst->compunit_symtab = cust; - pst->readin = true; - } - - /* Push it for inclusion processing later. */ - dwarf2_per_objfile->just_read_cus.push_back (per_cu); - - /* Not needed any more. */ - cu->reset_builder (); -} - -/* Generate full symbol information for type unit PER_CU, whose DIEs have - already been loaded into memory. */ - -static void -process_full_type_unit (struct dwarf2_per_cu_data *per_cu, - enum language pretend_language) -{ - struct dwarf2_cu *cu = per_cu->cu; - struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile; - struct objfile *objfile = dwarf2_per_objfile->objfile; - struct compunit_symtab *cust; - struct signatured_type *sig_type; - - gdb_assert (per_cu->is_debug_types); - sig_type = (struct signatured_type *) per_cu; - - /* Clear the list here in case something was left over. */ - cu->method_list.clear (); - - cu->language = pretend_language; - cu->language_defn = language_def (cu->language); - - /* The symbol tables are set up in read_type_unit_scope. */ - process_die (cu->dies, cu); - - /* For now fudge the Go package. */ - if (cu->language == language_go) - fixup_go_packaging (cu); - - /* Now that we have processed all the DIEs in the CU, all the types - should be complete, and it should now be safe to compute all of the - physnames. */ - compute_delayed_physnames (cu); - - if (cu->language == language_rust) - rust_union_quirks (cu); - - /* TUs share symbol tables. - If this is the first TU to use this symtab, complete the construction - of it with end_expandable_symtab. Otherwise, complete the addition of - this TU's symbols to the existing symtab. */ - if (sig_type->type_unit_group->compunit_symtab == NULL) - { - buildsym_compunit *builder = cu->get_builder (); - cust = builder->end_expandable_symtab (0, SECT_OFF_TEXT (objfile)); - sig_type->type_unit_group->compunit_symtab = cust; - - if (cust != NULL) - { - /* Set symtab language to language from DW_AT_language. If the - compilation is from a C file generated by language preprocessors, - do not set the language if it was already deduced by - start_subfile. */ - if (!(cu->language == language_c - && COMPUNIT_FILETABS (cust)->language != language_c)) - COMPUNIT_FILETABS (cust)->language = cu->language; - } - } - else - { - cu->get_builder ()->augment_type_symtab (); - cust = sig_type->type_unit_group->compunit_symtab; - } - - if (dwarf2_per_objfile->using_index) - per_cu->v.quick->compunit_symtab = cust; - else - { - dwarf2_psymtab *pst = per_cu->v.psymtab; - pst->compunit_symtab = cust; - pst->readin = true; - } - - /* Not needed any more. */ - cu->reset_builder (); -} - -/* Process an imported unit DIE. */ - -static void -process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu) -{ - struct attribute *attr; - - /* For now we don't handle imported units in type units. */ - if (cu->per_cu->is_debug_types) - { - error (_("Dwarf Error: DW_TAG_imported_unit is not" - " supported in type units [in module %s]"), - objfile_name (cu->per_cu->dwarf2_per_objfile->objfile)); - } - - attr = dwarf2_attr (die, DW_AT_import, cu); - if (attr != NULL) - { - sect_offset sect_off = dwarf2_get_ref_die_offset (attr); - bool is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz); - dwarf2_per_cu_data *per_cu - = dwarf2_find_containing_comp_unit (sect_off, is_dwz, - cu->per_cu->dwarf2_per_objfile); - - /* If necessary, add it to the queue and load its DIEs. */ - if (maybe_queue_comp_unit (cu, per_cu, cu->language)) - load_full_comp_unit (per_cu, false, cu->language); - - cu->per_cu->imported_symtabs_push (per_cu); - } -} - -/* RAII object that represents a process_die scope: i.e., - starts/finishes processing a DIE. */ -class process_die_scope -{ -public: - process_die_scope (die_info *die, dwarf2_cu *cu) - : m_die (die), m_cu (cu) - { - /* We should only be processing DIEs not already in process. */ - gdb_assert (!m_die->in_process); - m_die->in_process = true; - } - - ~process_die_scope () - { - m_die->in_process = false; - - /* If we're done processing the DIE for the CU that owns the line - header, we don't need the line header anymore. */ - if (m_cu->line_header_die_owner == m_die) - { - delete m_cu->line_header; - m_cu->line_header = NULL; - m_cu->line_header_die_owner = NULL; - } - } - -private: - die_info *m_die; - dwarf2_cu *m_cu; -}; - -/* Process a die and its children. */ - -static void -process_die (struct die_info *die, struct dwarf2_cu *cu) -{ - process_die_scope scope (die, cu); - - switch (die->tag) - { - case DW_TAG_padding: - break; - case DW_TAG_compile_unit: - case DW_TAG_partial_unit: - read_file_scope (die, cu); - break; - case DW_TAG_type_unit: - read_type_unit_scope (die, cu); - break; - case DW_TAG_subprogram: - /* Nested subprograms in Fortran get a prefix. */ - if (cu->language == language_fortran - && die->parent != NULL - && die->parent->tag == DW_TAG_subprogram) - cu->processing_has_namespace_info = true; - /* Fall through. */ - case DW_TAG_inlined_subroutine: - read_func_scope (die, cu); - break; - case DW_TAG_lexical_block: - case DW_TAG_try_block: - case DW_TAG_catch_block: - read_lexical_block_scope (die, cu); - break; - case DW_TAG_call_site: - case DW_TAG_GNU_call_site: - read_call_site_scope (die, cu); - break; - case DW_TAG_class_type: - case DW_TAG_interface_type: - case DW_TAG_structure_type: - case DW_TAG_union_type: - process_structure_scope (die, cu); - break; - case DW_TAG_enumeration_type: - process_enumeration_scope (die, cu); - break; - - /* These dies have a type, but processing them does not create - a symbol or recurse to process the children. Therefore we can - read them on-demand through read_type_die. */ - case DW_TAG_subroutine_type: - case DW_TAG_set_type: - case DW_TAG_array_type: - case DW_TAG_pointer_type: - case DW_TAG_ptr_to_member_type: - case DW_TAG_reference_type: - case DW_TAG_rvalue_reference_type: - case DW_TAG_string_type: - break; - - case DW_TAG_base_type: - case DW_TAG_subrange_type: - case DW_TAG_typedef: - /* Add a typedef symbol for the type definition, if it has a - DW_AT_name. */ - new_symbol (die, read_type_die (die, cu), cu); - break; - case DW_TAG_common_block: - read_common_block (die, cu); - break; - case DW_TAG_common_inclusion: - break; - case DW_TAG_namespace: - cu->processing_has_namespace_info = true; - read_namespace (die, cu); - break; - case DW_TAG_module: - cu->processing_has_namespace_info = true; - read_module (die, cu); - break; - case DW_TAG_imported_declaration: - cu->processing_has_namespace_info = true; - if (read_namespace_alias (die, cu)) - break; - /* The declaration is not a global namespace alias. */ - /* Fall through. */ - case DW_TAG_imported_module: - cu->processing_has_namespace_info = true; - if (die->child != NULL && (die->tag == DW_TAG_imported_declaration - || cu->language != language_fortran)) - complaint (_("Tag '%s' has unexpected children"), - dwarf_tag_name (die->tag)); - read_import_statement (die, cu); - break; - - case DW_TAG_imported_unit: - process_imported_unit_die (die, cu); - break; - - case DW_TAG_variable: - read_variable (die, cu); - break; - - default: - new_symbol (die, NULL, cu); - break; - } -} - -/* DWARF name computation. */ - -/* A helper function for dwarf2_compute_name which determines whether DIE - needs to have the name of the scope prepended to the name listed in the - die. */ - -static int -die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu) -{ - struct attribute *attr; - - switch (die->tag) - { - case DW_TAG_namespace: - case DW_TAG_typedef: - case DW_TAG_class_type: - case DW_TAG_interface_type: - case DW_TAG_structure_type: - case DW_TAG_union_type: - case DW_TAG_enumeration_type: - case DW_TAG_enumerator: - case DW_TAG_subprogram: - case DW_TAG_inlined_subroutine: - case DW_TAG_member: - case DW_TAG_imported_declaration: - return 1; - - case DW_TAG_variable: - case DW_TAG_constant: - /* We only need to prefix "globally" visible variables. These include - any variable marked with DW_AT_external or any variable that - lives in a namespace. [Variables in anonymous namespaces - require prefixing, but they are not DW_AT_external.] */ - - if (dwarf2_attr (die, DW_AT_specification, cu)) - { - struct dwarf2_cu *spec_cu = cu; - - return die_needs_namespace (die_specification (die, &spec_cu), - spec_cu); - } - - attr = dwarf2_attr (die, DW_AT_external, cu); - if (attr == NULL && die->parent->tag != DW_TAG_namespace - && die->parent->tag != DW_TAG_module) - return 0; - /* A variable in a lexical block of some kind does not need a - namespace, even though in C++ such variables may be external - and have a mangled name. */ - if (die->parent->tag == DW_TAG_lexical_block - || die->parent->tag == DW_TAG_try_block - || die->parent->tag == DW_TAG_catch_block - || die->parent->tag == DW_TAG_subprogram) - return 0; - return 1; - - default: - return 0; - } -} - -/* Return the DIE's linkage name attribute, either DW_AT_linkage_name - or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not - defined for the given DIE. */ - -static struct attribute * -dw2_linkage_name_attr (struct die_info *die, struct dwarf2_cu *cu) -{ - struct attribute *attr; - - attr = dwarf2_attr (die, DW_AT_linkage_name, cu); - if (attr == NULL) - attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu); - - return attr; -} - -/* Return the DIE's linkage name as a string, either DW_AT_linkage_name - or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not - defined for the given DIE. */ - -static const char * -dw2_linkage_name (struct die_info *die, struct dwarf2_cu *cu) -{ - const char *linkage_name; - - linkage_name = dwarf2_string_attr (die, DW_AT_linkage_name, cu); - if (linkage_name == NULL) - linkage_name = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu); - - return linkage_name; -} - -/* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero, - compute the physname for the object, which include a method's: - - formal parameters (C++), - - receiver type (Go), - - The term "physname" is a bit confusing. - For C++, for example, it is the demangled name. - For Go, for example, it's the mangled name. - - For Ada, return the DIE's linkage name rather than the fully qualified - name. PHYSNAME is ignored.. - - The result is allocated on the objfile_obstack and canonicalized. */ - -static const char * -dwarf2_compute_name (const char *name, - struct die_info *die, struct dwarf2_cu *cu, - int physname) -{ - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - - if (name == NULL) - name = dwarf2_name (die, cu); - - /* For Fortran GDB prefers DW_AT_*linkage_name for the physname if present - but otherwise compute it by typename_concat inside GDB. - FIXME: Actually this is not really true, or at least not always true. - It's all very confusing. compute_and_set_names doesn't try to demangle - Fortran names because there is no mangling standard. So new_symbol - will set the demangled name to the result of dwarf2_full_name, and it is - the demangled name that GDB uses if it exists. */ - if (cu->language == language_ada - || (cu->language == language_fortran && physname)) - { - /* For Ada unit, we prefer the linkage name over the name, as - the former contains the exported name, which the user expects - to be able to reference. Ideally, we want the user to be able - to reference this entity using either natural or linkage name, - but we haven't started looking at this enhancement yet. */ - const char *linkage_name = dw2_linkage_name (die, cu); - - if (linkage_name != NULL) - return linkage_name; - } - - /* These are the only languages we know how to qualify names in. */ - if (name != NULL - && (cu->language == language_cplus - || cu->language == language_fortran || cu->language == language_d - || cu->language == language_rust)) - { - if (die_needs_namespace (die, cu)) - { - const char *prefix; - const char *canonical_name = NULL; - - string_file buf; - - prefix = determine_prefix (die, cu); - if (*prefix != '\0') - { - gdb::unique_xmalloc_ptr<char> prefixed_name - (typename_concat (NULL, prefix, name, physname, cu)); - - buf.puts (prefixed_name.get ()); - } - else - buf.puts (name); - - /* Template parameters may be specified in the DIE's DW_AT_name, or - as children with DW_TAG_template_type_param or - DW_TAG_value_type_param. If the latter, add them to the name - here. If the name already has template parameters, then - skip this step; some versions of GCC emit both, and - it is more efficient to use the pre-computed name. - - Something to keep in mind about this process: it is very - unlikely, or in some cases downright impossible, to produce - something that will match the mangled name of a function. - If the definition of the function has the same debug info, - we should be able to match up with it anyway. But fallbacks - using the minimal symbol, for instance to find a method - implemented in a stripped copy of libstdc++, will not work. - If we do not have debug info for the definition, we will have to - match them up some other way. - - When we do name matching there is a related problem with function - templates; two instantiated function templates are allowed to - differ only by their return types, which we do not add here. */ - - if (cu->language == language_cplus && strchr (name, '<') == NULL) - { - struct attribute *attr; - struct die_info *child; - int first = 1; - - die->building_fullname = 1; - - for (child = die->child; child != NULL; child = child->sibling) - { - struct type *type; - LONGEST value; - const gdb_byte *bytes; - struct dwarf2_locexpr_baton *baton; - struct value *v; - - if (child->tag != DW_TAG_template_type_param - && child->tag != DW_TAG_template_value_param) - continue; - - if (first) - { - buf.puts ("<"); - first = 0; - } - else - buf.puts (", "); - - attr = dwarf2_attr (child, DW_AT_type, cu); - if (attr == NULL) - { - complaint (_("template parameter missing DW_AT_type")); - buf.puts ("UNKNOWN_TYPE"); - continue; - } - type = die_type (child, cu); - - if (child->tag == DW_TAG_template_type_param) - { - c_print_type (type, "", &buf, -1, 0, cu->language, - &type_print_raw_options); - continue; - } - - attr = dwarf2_attr (child, DW_AT_const_value, cu); - if (attr == NULL) - { - complaint (_("template parameter missing " - "DW_AT_const_value")); - buf.puts ("UNKNOWN_VALUE"); - continue; - } - - dwarf2_const_value_attr (attr, type, name, - &cu->comp_unit_obstack, cu, - &value, &bytes, &baton); - - if (TYPE_NOSIGN (type)) - /* GDB prints characters as NUMBER 'CHAR'. If that's - changed, this can use value_print instead. */ - c_printchar (value, type, &buf); - else - { - struct value_print_options opts; - - if (baton != NULL) - v = dwarf2_evaluate_loc_desc (type, NULL, - baton->data, - baton->size, - baton->per_cu); - else if (bytes != NULL) - { - v = allocate_value (type); - memcpy (value_contents_writeable (v), bytes, - TYPE_LENGTH (type)); - } - else - v = value_from_longest (type, value); - - /* Specify decimal so that we do not depend on - the radix. */ - get_formatted_print_options (&opts, 'd'); - opts.raw = 1; - value_print (v, &buf, &opts); - release_value (v); - } - } - - die->building_fullname = 0; - - if (!first) - { - /* Close the argument list, with a space if necessary - (nested templates). */ - if (!buf.empty () && buf.string ().back () == '>') - buf.puts (" >"); - else - buf.puts (">"); - } - } - - /* For C++ methods, append formal parameter type - information, if PHYSNAME. */ - - if (physname && die->tag == DW_TAG_subprogram - && cu->language == language_cplus) - { - struct type *type = read_type_die (die, cu); - - c_type_print_args (type, &buf, 1, cu->language, - &type_print_raw_options); - - if (cu->language == language_cplus) - { - /* Assume that an artificial first parameter is - "this", but do not crash if it is not. RealView - marks unnamed (and thus unused) parameters as - artificial; there is no way to differentiate - the two cases. */ - if (TYPE_NFIELDS (type) > 0 - && TYPE_FIELD_ARTIFICIAL (type, 0) - && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR - && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, - 0)))) - buf.puts (" const"); - } - } - - const std::string &intermediate_name = buf.string (); - - if (cu->language == language_cplus) - canonical_name - = dwarf2_canonicalize_name (intermediate_name.c_str (), cu, - &objfile->per_bfd->storage_obstack); - - /* If we only computed INTERMEDIATE_NAME, or if - INTERMEDIATE_NAME is already canonical, then we need to - copy it to the appropriate obstack. */ - if (canonical_name == NULL || canonical_name == intermediate_name.c_str ()) - name = obstack_strdup (&objfile->per_bfd->storage_obstack, - intermediate_name); - else - name = canonical_name; - } - } - - return name; -} - -/* Return the fully qualified name of DIE, based on its DW_AT_name. - If scope qualifiers are appropriate they will be added. The result - will be allocated on the storage_obstack, or NULL if the DIE does - not have a name. NAME may either be from a previous call to - dwarf2_name or NULL. - - The output string will be canonicalized (if C++). */ - -static const char * -dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu) -{ - return dwarf2_compute_name (name, die, cu, 0); -} - -/* Construct a physname for the given DIE in CU. NAME may either be - from a previous call to dwarf2_name or NULL. The result will be - allocated on the objfile_objstack or NULL if the DIE does not have a - name. - - The output string will be canonicalized (if C++). */ - -static const char * -dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu) -{ - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - const char *retval, *mangled = NULL, *canon = NULL; - int need_copy = 1; - - /* In this case dwarf2_compute_name is just a shortcut not building anything - on its own. */ - if (!die_needs_namespace (die, cu)) - return dwarf2_compute_name (name, die, cu, 1); - - mangled = dw2_linkage_name (die, cu); - - /* rustc emits invalid values for DW_AT_linkage_name. Ignore these. - See https://github.com/rust-lang/rust/issues/32925. */ - if (cu->language == language_rust && mangled != NULL - && strchr (mangled, '{') != NULL) - mangled = NULL; - - /* DW_AT_linkage_name is missing in some cases - depend on what GDB - has computed. */ - gdb::unique_xmalloc_ptr<char> demangled; - if (mangled != NULL) - { - - if (language_def (cu->language)->la_store_sym_names_in_linkage_form_p) - { - /* Do nothing (do not demangle the symbol name). */ - } - else if (cu->language == language_go) - { - /* This is a lie, but we already lie to the caller new_symbol. - new_symbol assumes we return the mangled name. - This just undoes that lie until things are cleaned up. */ - } - else - { - /* Use DMGL_RET_DROP for C++ template functions to suppress - their return type. It is easier for GDB users to search - for such functions as `name(params)' than `long name(params)'. - In such case the minimal symbol names do not match the full - symbol names but for template functions there is never a need - to look up their definition from their declaration so - the only disadvantage remains the minimal symbol variant - `long name(params)' does not have the proper inferior type. */ - demangled.reset (gdb_demangle (mangled, - (DMGL_PARAMS | DMGL_ANSI - | DMGL_RET_DROP))); - } - if (demangled) - canon = demangled.get (); - else - { - canon = mangled; - need_copy = 0; - } - } - - if (canon == NULL || check_physname) - { - const char *physname = dwarf2_compute_name (name, die, cu, 1); - - if (canon != NULL && strcmp (physname, canon) != 0) - { - /* It may not mean a bug in GDB. The compiler could also - compute DW_AT_linkage_name incorrectly. But in such case - GDB would need to be bug-to-bug compatible. */ - - complaint (_("Computed physname <%s> does not match demangled <%s> " - "(from linkage <%s>) - DIE at %s [in module %s]"), - physname, canon, mangled, sect_offset_str (die->sect_off), - objfile_name (objfile)); - - /* Prefer DW_AT_linkage_name (in the CANON form) - when it - is available here - over computed PHYSNAME. It is safer - against both buggy GDB and buggy compilers. */ - - retval = canon; - } - else - { - retval = physname; - need_copy = 0; - } - } - else - retval = canon; - - if (need_copy) - retval = obstack_strdup (&objfile->per_bfd->storage_obstack, retval); - - return retval; -} - -/* Inspect DIE in CU for a namespace alias. If one exists, record - a new symbol for it. - - Returns 1 if a namespace alias was recorded, 0 otherwise. */ - -static int -read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu) -{ - struct attribute *attr; - - /* If the die does not have a name, this is not a namespace - alias. */ - attr = dwarf2_attr (die, DW_AT_name, cu); - if (attr != NULL) - { - int num; - struct die_info *d = die; - struct dwarf2_cu *imported_cu = cu; - - /* If the compiler has nested DW_AT_imported_declaration DIEs, - keep inspecting DIEs until we hit the underlying import. */ -#define MAX_NESTED_IMPORTED_DECLARATIONS 100 - for (num = 0; num < MAX_NESTED_IMPORTED_DECLARATIONS; ++num) - { - attr = dwarf2_attr (d, DW_AT_import, cu); - if (attr == NULL) - break; - - d = follow_die_ref (d, attr, &imported_cu); - if (d->tag != DW_TAG_imported_declaration) - break; - } - - if (num == MAX_NESTED_IMPORTED_DECLARATIONS) - { - complaint (_("DIE at %s has too many recursively imported " - "declarations"), sect_offset_str (d->sect_off)); - return 0; - } - - if (attr != NULL) - { - struct type *type; - sect_offset sect_off = dwarf2_get_ref_die_offset (attr); - - type = get_die_type_at_offset (sect_off, cu->per_cu); - if (type != NULL && TYPE_CODE (type) == TYPE_CODE_NAMESPACE) - { - /* This declaration is a global namespace alias. Add - a symbol for it whose type is the aliased namespace. */ - new_symbol (die, type, cu); - return 1; - } - } - } - - return 0; -} - -/* Return the using directives repository (global or local?) to use in the - current context for CU. - - For Ada, imported declarations can materialize renamings, which *may* be - global. However it is impossible (for now?) in DWARF to distinguish - "external" imported declarations and "static" ones. As all imported - declarations seem to be static in all other languages, make them all CU-wide - global only in Ada. */ - -static struct using_direct ** -using_directives (struct dwarf2_cu *cu) -{ - if (cu->language == language_ada - && cu->get_builder ()->outermost_context_p ()) - return cu->get_builder ()->get_global_using_directives (); - else - return cu->get_builder ()->get_local_using_directives (); -} - -/* Read the import statement specified by the given die and record it. */ - -static void -read_import_statement (struct die_info *die, struct dwarf2_cu *cu) -{ - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - struct attribute *import_attr; - struct die_info *imported_die, *child_die; - struct dwarf2_cu *imported_cu; - const char *imported_name; - const char *imported_name_prefix; - const char *canonical_name; - const char *import_alias; - const char *imported_declaration = NULL; - const char *import_prefix; - std::vector<const char *> excludes; - - import_attr = dwarf2_attr (die, DW_AT_import, cu); - if (import_attr == NULL) - { - complaint (_("Tag '%s' has no DW_AT_import"), - dwarf_tag_name (die->tag)); - return; - } - - imported_cu = cu; - imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu); - imported_name = dwarf2_name (imported_die, imported_cu); - if (imported_name == NULL) - { - /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524 - - The import in the following code: - namespace A - { - typedef int B; - } - - int main () - { - using A::B; - B b; - return b; - } - - ... - <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration) - <52> DW_AT_decl_file : 1 - <53> DW_AT_decl_line : 6 - <54> DW_AT_import : <0x75> - <2><58>: Abbrev Number: 4 (DW_TAG_typedef) - <59> DW_AT_name : B - <5b> DW_AT_decl_file : 1 - <5c> DW_AT_decl_line : 2 - <5d> DW_AT_type : <0x6e> - ... - <1><75>: Abbrev Number: 7 (DW_TAG_base_type) - <76> DW_AT_byte_size : 4 - <77> DW_AT_encoding : 5 (signed) - - imports the wrong die ( 0x75 instead of 0x58 ). - This case will be ignored until the gcc bug is fixed. */ - return; - } - - /* Figure out the local name after import. */ - import_alias = dwarf2_name (die, cu); - - /* Figure out where the statement is being imported to. */ - import_prefix = determine_prefix (die, cu); - - /* Figure out what the scope of the imported die is and prepend it - to the name of the imported die. */ - imported_name_prefix = determine_prefix (imported_die, imported_cu); - - if (imported_die->tag != DW_TAG_namespace - && imported_die->tag != DW_TAG_module) - { - imported_declaration = imported_name; - canonical_name = imported_name_prefix; - } - else if (strlen (imported_name_prefix) > 0) - canonical_name = obconcat (&objfile->objfile_obstack, - imported_name_prefix, - (cu->language == language_d ? "." : "::"), - imported_name, (char *) NULL); - else - canonical_name = imported_name; - - if (die->tag == DW_TAG_imported_module && cu->language == language_fortran) - for (child_die = die->child; child_die && child_die->tag; - child_die = sibling_die (child_die)) - { - /* DWARF-4: A Fortran use statement with a “rename list” may be - represented by an imported module entry with an import attribute - referring to the module and owned entries corresponding to those - entities that are renamed as part of being imported. */ - - if (child_die->tag != DW_TAG_imported_declaration) - { - complaint (_("child DW_TAG_imported_declaration expected " - "- DIE at %s [in module %s]"), - sect_offset_str (child_die->sect_off), - objfile_name (objfile)); - continue; - } - - import_attr = dwarf2_attr (child_die, DW_AT_import, cu); - if (import_attr == NULL) - { - complaint (_("Tag '%s' has no DW_AT_import"), - dwarf_tag_name (child_die->tag)); - continue; - } - - imported_cu = cu; - imported_die = follow_die_ref_or_sig (child_die, import_attr, - &imported_cu); - imported_name = dwarf2_name (imported_die, imported_cu); - if (imported_name == NULL) - { - complaint (_("child DW_TAG_imported_declaration has unknown " - "imported name - DIE at %s [in module %s]"), - sect_offset_str (child_die->sect_off), - objfile_name (objfile)); - continue; - } - - excludes.push_back (imported_name); - - process_die (child_die, cu); - } - - add_using_directive (using_directives (cu), - import_prefix, - canonical_name, - import_alias, - imported_declaration, - excludes, - 0, - &objfile->objfile_obstack); -} - -/* ICC<14 does not output the required DW_AT_declaration on incomplete - types, but gives them a size of zero. Starting with version 14, - ICC is compatible with GCC. */ - -static bool -producer_is_icc_lt_14 (struct dwarf2_cu *cu) -{ - if (!cu->checked_producer) - check_producer (cu); - - return cu->producer_is_icc_lt_14; -} - -/* ICC generates a DW_AT_type for C void functions. This was observed on - ICC 14.0.5.212, and appears to be against the DWARF spec (V5 3.3.2) - which says that void functions should not have a DW_AT_type. */ - -static bool -producer_is_icc (struct dwarf2_cu *cu) -{ - if (!cu->checked_producer) - check_producer (cu); - - return cu->producer_is_icc; -} - -/* Check for possibly missing DW_AT_comp_dir with relative .debug_line - directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed - this, it was first present in GCC release 4.3.0. */ - -static bool -producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu) -{ - if (!cu->checked_producer) - check_producer (cu); - - return cu->producer_is_gcc_lt_4_3; -} - -static file_and_directory -find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu) -{ - file_and_directory res; - - /* Find the filename. Do not use dwarf2_name here, since the filename - is not a source language identifier. */ - res.name = dwarf2_string_attr (die, DW_AT_name, cu); - res.comp_dir = dwarf2_string_attr (die, DW_AT_comp_dir, cu); - - if (res.comp_dir == NULL - && producer_is_gcc_lt_4_3 (cu) && res.name != NULL - && IS_ABSOLUTE_PATH (res.name)) - { - res.comp_dir_storage = ldirname (res.name); - if (!res.comp_dir_storage.empty ()) - res.comp_dir = res.comp_dir_storage.c_str (); - } - if (res.comp_dir != NULL) - { - /* Irix 6.2 native cc prepends <machine>.: to the compilation - directory, get rid of it. */ - const char *cp = strchr (res.comp_dir, ':'); - - if (cp && cp != res.comp_dir && cp[-1] == '.' && cp[1] == '/') - res.comp_dir = cp + 1; - } - - if (res.name == NULL) - res.name = "<unknown>"; - - return res; -} - -/* Handle DW_AT_stmt_list for a compilation unit. - DIE is the DW_TAG_compile_unit die for CU. - COMP_DIR is the compilation directory. LOWPC is passed to - dwarf_decode_lines. See dwarf_decode_lines comments about it. */ - -static void -handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu, - const char *comp_dir, CORE_ADDR lowpc) /* ARI: editCase function */ -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - struct objfile *objfile = dwarf2_per_objfile->objfile; - struct attribute *attr; - struct line_header line_header_local; - hashval_t line_header_local_hash; - void **slot; - int decode_mapping; - - gdb_assert (! cu->per_cu->is_debug_types); - - attr = dwarf2_attr (die, DW_AT_stmt_list, cu); - if (attr == NULL) - return; - - sect_offset line_offset = (sect_offset) DW_UNSND (attr); - - /* The line header hash table is only created if needed (it exists to - prevent redundant reading of the line table for partial_units). - If we're given a partial_unit, we'll need it. If we're given a - compile_unit, then use the line header hash table if it's already - created, but don't create one just yet. */ - - if (dwarf2_per_objfile->line_header_hash == NULL - && die->tag == DW_TAG_partial_unit) - { - dwarf2_per_objfile->line_header_hash - = htab_create_alloc_ex (127, line_header_hash_voidp, - line_header_eq_voidp, - free_line_header_voidp, - &objfile->objfile_obstack, - hashtab_obstack_allocate, - dummy_obstack_deallocate); - } - - line_header_local.sect_off = line_offset; - line_header_local.offset_in_dwz = cu->per_cu->is_dwz; - line_header_local_hash = line_header_hash (&line_header_local); - if (dwarf2_per_objfile->line_header_hash != NULL) - { - slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash, - &line_header_local, - line_header_local_hash, NO_INSERT); - - /* For DW_TAG_compile_unit we need info like symtab::linetable which - is not present in *SLOT (since if there is something in *SLOT then - it will be for a partial_unit). */ - if (die->tag == DW_TAG_partial_unit && slot != NULL) - { - gdb_assert (*slot != NULL); - cu->line_header = (struct line_header *) *slot; - return; - } - } - - /* dwarf_decode_line_header does not yet provide sufficient information. - We always have to call also dwarf_decode_lines for it. */ - line_header_up lh = dwarf_decode_line_header (line_offset, cu); - if (lh == NULL) - return; - - cu->line_header = lh.release (); - cu->line_header_die_owner = die; - - if (dwarf2_per_objfile->line_header_hash == NULL) - slot = NULL; - else - { - slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash, - &line_header_local, - line_header_local_hash, INSERT); - gdb_assert (slot != NULL); - } - if (slot != NULL && *slot == NULL) - { - /* This newly decoded line number information unit will be owned - by line_header_hash hash table. */ - *slot = cu->line_header; - cu->line_header_die_owner = NULL; - } - else - { - /* We cannot free any current entry in (*slot) as that struct line_header - may be already used by multiple CUs. Create only temporary decoded - line_header for this CU - it may happen at most once for each line - number information unit. And if we're not using line_header_hash - then this is what we want as well. */ - gdb_assert (die->tag != DW_TAG_partial_unit); - } - decode_mapping = (die->tag != DW_TAG_partial_unit); - dwarf_decode_lines (cu->line_header, comp_dir, cu, NULL, lowpc, - decode_mapping); - -} - -/* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */ - -static void -read_file_scope (struct die_info *die, struct dwarf2_cu *cu) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - struct objfile *objfile = dwarf2_per_objfile->objfile; - struct gdbarch *gdbarch = get_objfile_arch (objfile); - CORE_ADDR lowpc = ((CORE_ADDR) -1); - CORE_ADDR highpc = ((CORE_ADDR) 0); - struct attribute *attr; - struct die_info *child_die; - CORE_ADDR baseaddr; - - prepare_one_comp_unit (cu, die, cu->language); - baseaddr = objfile->text_section_offset (); - - get_scope_pc_bounds (die, &lowpc, &highpc, cu); - - /* If we didn't find a lowpc, set it to highpc to avoid complaints - from finish_block. */ - if (lowpc == ((CORE_ADDR) -1)) - lowpc = highpc; - lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr); - - file_and_directory fnd = find_file_and_directory (die, cu); - - /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not - standardised yet. As a workaround for the language detection we fall - back to the DW_AT_producer string. */ - if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL) - cu->language = language_opencl; - - /* Similar hack for Go. */ - if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL) - set_cu_language (DW_LANG_Go, cu); - - cu->start_symtab (fnd.name, fnd.comp_dir, lowpc); - - /* Decode line number information if present. We do this before - processing child DIEs, so that the line header table is available - for DW_AT_decl_file. */ - handle_DW_AT_stmt_list (die, cu, fnd.comp_dir, lowpc); - - /* Process all dies in compilation unit. */ - if (die->child != NULL) - { - child_die = die->child; - while (child_die && child_die->tag) - { - process_die (child_die, cu); - child_die = sibling_die (child_die); - } - } - - /* Decode macro information, if present. Dwarf 2 macro information - refers to information in the line number info statement program - header, so we can only read it if we've read the header - successfully. */ - attr = dwarf2_attr (die, DW_AT_macros, cu); - if (attr == NULL) - attr = dwarf2_attr (die, DW_AT_GNU_macros, cu); - if (attr && cu->line_header) - { - if (dwarf2_attr (die, DW_AT_macro_info, cu)) - complaint (_("CU refers to both DW_AT_macros and DW_AT_macro_info")); - - dwarf_decode_macros (cu, DW_UNSND (attr), 1); - } - else - { - attr = dwarf2_attr (die, DW_AT_macro_info, cu); - if (attr && cu->line_header) - { - unsigned int macro_offset = DW_UNSND (attr); - - dwarf_decode_macros (cu, macro_offset, 0); - } - } -} - -void -dwarf2_cu::setup_type_unit_groups (struct die_info *die) -{ - struct type_unit_group *tu_group; - int first_time; - struct attribute *attr; - unsigned int i; - struct signatured_type *sig_type; - - gdb_assert (per_cu->is_debug_types); - sig_type = (struct signatured_type *) per_cu; - - attr = dwarf2_attr (die, DW_AT_stmt_list, this); - - /* If we're using .gdb_index (includes -readnow) then - per_cu->type_unit_group may not have been set up yet. */ - if (sig_type->type_unit_group == NULL) - sig_type->type_unit_group = get_type_unit_group (this, attr); - tu_group = sig_type->type_unit_group; - - /* If we've already processed this stmt_list there's no real need to - do it again, we could fake it and just recreate the part we need - (file name,index -> symtab mapping). If data shows this optimization - is useful we can do it then. */ - first_time = tu_group->compunit_symtab == NULL; - - /* We have to handle the case of both a missing DW_AT_stmt_list or bad - debug info. */ - line_header_up lh; - if (attr != NULL) - { - sect_offset line_offset = (sect_offset) DW_UNSND (attr); - lh = dwarf_decode_line_header (line_offset, this); - } - if (lh == NULL) - { - if (first_time) - start_symtab ("", NULL, 0); - else - { - gdb_assert (tu_group->symtabs == NULL); - gdb_assert (m_builder == nullptr); - struct compunit_symtab *cust = tu_group->compunit_symtab; - m_builder.reset (new struct buildsym_compunit - (COMPUNIT_OBJFILE (cust), "", - COMPUNIT_DIRNAME (cust), - compunit_language (cust), - 0, cust)); - } - return; - } - - line_header = lh.release (); - line_header_die_owner = die; - - if (first_time) - { - struct compunit_symtab *cust = start_symtab ("", NULL, 0); - - /* Note: We don't assign tu_group->compunit_symtab yet because we're - still initializing it, and our caller (a few levels up) - process_full_type_unit still needs to know if this is the first - time. */ - - tu_group->num_symtabs = line_header->file_names_size (); - tu_group->symtabs = XNEWVEC (struct symtab *, - line_header->file_names_size ()); - - auto &file_names = line_header->file_names (); - for (i = 0; i < file_names.size (); ++i) - { - file_entry &fe = file_names[i]; - dwarf2_start_subfile (this, fe.name, - fe.include_dir (line_header)); - buildsym_compunit *b = get_builder (); - if (b->get_current_subfile ()->symtab == NULL) - { - /* NOTE: start_subfile will recognize when it's been - passed a file it has already seen. So we can't - assume there's a simple mapping from - cu->line_header->file_names to subfiles, plus - cu->line_header->file_names may contain dups. */ - b->get_current_subfile ()->symtab - = allocate_symtab (cust, b->get_current_subfile ()->name); - } - - fe.symtab = b->get_current_subfile ()->symtab; - tu_group->symtabs[i] = fe.symtab; - } - } - else - { - gdb_assert (m_builder == nullptr); - struct compunit_symtab *cust = tu_group->compunit_symtab; - m_builder.reset (new struct buildsym_compunit - (COMPUNIT_OBJFILE (cust), "", - COMPUNIT_DIRNAME (cust), - compunit_language (cust), - 0, cust)); - - auto &file_names = line_header->file_names (); - for (i = 0; i < file_names.size (); ++i) - { - file_entry &fe = file_names[i]; - fe.symtab = tu_group->symtabs[i]; - } - } - - /* The main symtab is allocated last. Type units don't have DW_AT_name - so they don't have a "real" (so to speak) symtab anyway. - There is later code that will assign the main symtab to all symbols - that don't have one. We need to handle the case of a symbol with a - missing symtab (DW_AT_decl_file) anyway. */ -} - -/* Process DW_TAG_type_unit. - For TUs we want to skip the first top level sibling if it's not the - actual type being defined by this TU. In this case the first top - level sibling is there to provide context only. */ - -static void -read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu) -{ - struct die_info *child_die; - - prepare_one_comp_unit (cu, die, language_minimal); - - /* Initialize (or reinitialize) the machinery for building symtabs. - We do this before processing child DIEs, so that the line header table - is available for DW_AT_decl_file. */ - cu->setup_type_unit_groups (die); - - if (die->child != NULL) - { - child_die = die->child; - while (child_die && child_die->tag) - { - process_die (child_die, cu); - child_die = sibling_die (child_die); - } - } -} - -/* DWO/DWP files. - - http://gcc.gnu.org/wiki/DebugFission - http://gcc.gnu.org/wiki/DebugFissionDWP - - To simplify handling of both DWO files ("object" files with the DWARF info) - and DWP files (a file with the DWOs packaged up into one file), we treat - DWP files as having a collection of virtual DWO files. */ - -static hashval_t -hash_dwo_file (const void *item) -{ - const struct dwo_file *dwo_file = (const struct dwo_file *) item; - hashval_t hash; - - hash = htab_hash_string (dwo_file->dwo_name); - if (dwo_file->comp_dir != NULL) - hash += htab_hash_string (dwo_file->comp_dir); - return hash; -} - -static int -eq_dwo_file (const void *item_lhs, const void *item_rhs) -{ - const struct dwo_file *lhs = (const struct dwo_file *) item_lhs; - const struct dwo_file *rhs = (const struct dwo_file *) item_rhs; - - if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0) - return 0; - if (lhs->comp_dir == NULL || rhs->comp_dir == NULL) - return lhs->comp_dir == rhs->comp_dir; - return strcmp (lhs->comp_dir, rhs->comp_dir) == 0; -} - -/* Allocate a hash table for DWO files. */ - -static htab_up -allocate_dwo_file_hash_table (struct objfile *objfile) -{ - auto delete_dwo_file = [] (void *item) - { - struct dwo_file *dwo_file = (struct dwo_file *) item; - - delete dwo_file; - }; - - return htab_up (htab_create_alloc_ex (41, - hash_dwo_file, - eq_dwo_file, - delete_dwo_file, - &objfile->objfile_obstack, - hashtab_obstack_allocate, - dummy_obstack_deallocate)); -} - -/* Lookup DWO file DWO_NAME. */ - -static void ** -lookup_dwo_file_slot (struct dwarf2_per_objfile *dwarf2_per_objfile, - const char *dwo_name, - const char *comp_dir) -{ - struct dwo_file find_entry; - void **slot; - - if (dwarf2_per_objfile->dwo_files == NULL) - dwarf2_per_objfile->dwo_files - = allocate_dwo_file_hash_table (dwarf2_per_objfile->objfile); - - find_entry.dwo_name = dwo_name; - find_entry.comp_dir = comp_dir; - slot = htab_find_slot (dwarf2_per_objfile->dwo_files.get (), &find_entry, - INSERT); - - return slot; -} - -static hashval_t -hash_dwo_unit (const void *item) -{ - const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item; - - /* This drops the top 32 bits of the id, but is ok for a hash. */ - return dwo_unit->signature; -} - -static int -eq_dwo_unit (const void *item_lhs, const void *item_rhs) -{ - const struct dwo_unit *lhs = (const struct dwo_unit *) item_lhs; - const struct dwo_unit *rhs = (const struct dwo_unit *) item_rhs; - - /* The signature is assumed to be unique within the DWO file. - So while object file CU dwo_id's always have the value zero, - that's OK, assuming each object file DWO file has only one CU, - and that's the rule for now. */ - return lhs->signature == rhs->signature; -} - -/* Allocate a hash table for DWO CUs,TUs. - There is one of these tables for each of CUs,TUs for each DWO file. */ - -static htab_t -allocate_dwo_unit_table (struct objfile *objfile) -{ - /* Start out with a pretty small number. - Generally DWO files contain only one CU and maybe some TUs. */ - return htab_create_alloc_ex (3, - hash_dwo_unit, - eq_dwo_unit, - NULL, - &objfile->objfile_obstack, - hashtab_obstack_allocate, - dummy_obstack_deallocate); -} - -/* die_reader_func for create_dwo_cu. */ - -static void -create_dwo_cu_reader (const struct die_reader_specs *reader, - const gdb_byte *info_ptr, - struct die_info *comp_unit_die, - int has_children, - struct dwo_file *dwo_file, - struct dwo_unit *dwo_unit) -{ - struct dwarf2_cu *cu = reader->cu; - sect_offset sect_off = cu->per_cu->sect_off; - struct dwarf2_section_info *section = cu->per_cu->section; - - gdb::optional<ULONGEST> signature = lookup_dwo_id (cu, comp_unit_die); - if (!signature.has_value ()) - { - complaint (_("Dwarf Error: debug entry at offset %s is missing" - " its dwo_id [in module %s]"), - sect_offset_str (sect_off), dwo_file->dwo_name); - return; - } - - dwo_unit->dwo_file = dwo_file; - dwo_unit->signature = *signature; - dwo_unit->section = section; - dwo_unit->sect_off = sect_off; - dwo_unit->length = cu->per_cu->length; - - if (dwarf_read_debug) - fprintf_unfiltered (gdb_stdlog, " offset %s, dwo_id %s\n", - sect_offset_str (sect_off), - hex_string (dwo_unit->signature)); -} - -/* Create the dwo_units for the CUs in a DWO_FILE. - Note: This function processes DWO files only, not DWP files. */ - -static void -create_cus_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile, - dwarf2_cu *cu, struct dwo_file &dwo_file, - dwarf2_section_info §ion, htab_t &cus_htab) -{ - struct objfile *objfile = dwarf2_per_objfile->objfile; - const gdb_byte *info_ptr, *end_ptr; - - section.read (objfile); - info_ptr = section.buffer; - - if (info_ptr == NULL) - return; - - if (dwarf_read_debug) - { - fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n", - section.get_name (), - section.get_file_name ()); - } - - end_ptr = info_ptr + section.size; - while (info_ptr < end_ptr) - { - struct dwarf2_per_cu_data per_cu; - struct dwo_unit read_unit {}; - struct dwo_unit *dwo_unit; - void **slot; - sect_offset sect_off = (sect_offset) (info_ptr - section.buffer); - - memset (&per_cu, 0, sizeof (per_cu)); - per_cu.dwarf2_per_objfile = dwarf2_per_objfile; - per_cu.is_debug_types = 0; - per_cu.sect_off = sect_offset (info_ptr - section.buffer); - per_cu.section = §ion; - - cutu_reader reader (&per_cu, cu, &dwo_file); - if (!reader.dummy_p) - create_dwo_cu_reader (&reader, reader.info_ptr, reader.comp_unit_die, - reader.has_children, &dwo_file, &read_unit); - info_ptr += per_cu.length; - - // If the unit could not be parsed, skip it. - if (read_unit.dwo_file == NULL) - continue; - - if (cus_htab == NULL) - cus_htab = allocate_dwo_unit_table (objfile); - - dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit); - *dwo_unit = read_unit; - slot = htab_find_slot (cus_htab, dwo_unit, INSERT); - gdb_assert (slot != NULL); - if (*slot != NULL) - { - const struct dwo_unit *dup_cu = (const struct dwo_unit *)*slot; - sect_offset dup_sect_off = dup_cu->sect_off; - - complaint (_("debug cu entry at offset %s is duplicate to" - " the entry at offset %s, signature %s"), - sect_offset_str (sect_off), sect_offset_str (dup_sect_off), - hex_string (dwo_unit->signature)); - } - *slot = (void *)dwo_unit; - } -} - -/* DWP file .debug_{cu,tu}_index section format: - [ref: http://gcc.gnu.org/wiki/DebugFissionDWP] - - DWP Version 1: - - Both index sections have the same format, and serve to map a 64-bit - signature to a set of section numbers. Each section begins with a header, - followed by a hash table of 64-bit signatures, a parallel table of 32-bit - indexes, and a pool of 32-bit section numbers. The index sections will be - aligned at 8-byte boundaries in the file. - - The index section header consists of: - - V, 32 bit version number - -, 32 bits unused - N, 32 bit number of compilation units or type units in the index - M, 32 bit number of slots in the hash table - - Numbers are recorded using the byte order of the application binary. - - The hash table begins at offset 16 in the section, and consists of an array - of M 64-bit slots. Each slot contains a 64-bit signature (using the byte - order of the application binary). Unused slots in the hash table are 0. - (We rely on the extreme unlikeliness of a signature being exactly 0.) - - The parallel table begins immediately after the hash table - (at offset 16 + 8 * M from the beginning of the section), and consists of an - array of 32-bit indexes (using the byte order of the application binary), - corresponding 1-1 with slots in the hash table. Each entry in the parallel - table contains a 32-bit index into the pool of section numbers. For unused - hash table slots, the corresponding entry in the parallel table will be 0. - - The pool of section numbers begins immediately following the hash table - (at offset 16 + 12 * M from the beginning of the section). The pool of - section numbers consists of an array of 32-bit words (using the byte order - of the application binary). Each item in the array is indexed starting - from 0. The hash table entry provides the index of the first section - number in the set. Additional section numbers in the set follow, and the - set is terminated by a 0 entry (section number 0 is not used in ELF). - - In each set of section numbers, the .debug_info.dwo or .debug_types.dwo - section must be the first entry in the set, and the .debug_abbrev.dwo must - be the second entry. Other members of the set may follow in any order. - - --- - - DWP Version 2: - - DWP Version 2 combines all the .debug_info, etc. sections into one, - and the entries in the index tables are now offsets into these sections. - CU offsets begin at 0. TU offsets begin at the size of the .debug_info - section. - - Index Section Contents: - Header - Hash Table of Signatures dwp_hash_table.hash_table - Parallel Table of Indices dwp_hash_table.unit_table - Table of Section Offsets dwp_hash_table.v2.{section_ids,offsets} - Table of Section Sizes dwp_hash_table.v2.sizes - - The index section header consists of: - - V, 32 bit version number - L, 32 bit number of columns in the table of section offsets - N, 32 bit number of compilation units or type units in the index - M, 32 bit number of slots in the hash table - - Numbers are recorded using the byte order of the application binary. - - The hash table has the same format as version 1. - The parallel table of indices has the same format as version 1, - except that the entries are origin-1 indices into the table of sections - offsets and the table of section sizes. - - The table of offsets begins immediately following the parallel table - (at offset 16 + 12 * M from the beginning of the section). The table is - a two-dimensional array of 32-bit words (using the byte order of the - application binary), with L columns and N+1 rows, in row-major order. - Each row in the array is indexed starting from 0. The first row provides - a key to the remaining rows: each column in this row provides an identifier - for a debug section, and the offsets in the same column of subsequent rows - refer to that section. The section identifiers are: - - DW_SECT_INFO 1 .debug_info.dwo - DW_SECT_TYPES 2 .debug_types.dwo - DW_SECT_ABBREV 3 .debug_abbrev.dwo - DW_SECT_LINE 4 .debug_line.dwo - DW_SECT_LOC 5 .debug_loc.dwo - DW_SECT_STR_OFFSETS 6 .debug_str_offsets.dwo - DW_SECT_MACINFO 7 .debug_macinfo.dwo - DW_SECT_MACRO 8 .debug_macro.dwo - - The offsets provided by the CU and TU index sections are the base offsets - for the contributions made by each CU or TU to the corresponding section - in the package file. Each CU and TU header contains an abbrev_offset - field, used to find the abbreviations table for that CU or TU within the - contribution to the .debug_abbrev.dwo section for that CU or TU, and should - be interpreted as relative to the base offset given in the index section. - Likewise, offsets into .debug_line.dwo from DW_AT_stmt_list attributes - should be interpreted as relative to the base offset for .debug_line.dwo, - and offsets into other debug sections obtained from DWARF attributes should - also be interpreted as relative to the corresponding base offset. - - The table of sizes begins immediately following the table of offsets. - Like the table of offsets, it is a two-dimensional array of 32-bit words, - with L columns and N rows, in row-major order. Each row in the array is - indexed starting from 1 (row 0 is shared by the two tables). - - --- - - Hash table lookup is handled the same in version 1 and 2: - - We assume that N and M will not exceed 2^32 - 1. - The size of the hash table, M, must be 2^k such that 2^k > 3*N/2. - - Given a 64-bit compilation unit signature or a type signature S, an entry - in the hash table is located as follows: - - 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with - the low-order k bits all set to 1. - - 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1). - - 3) If the hash table entry at index H matches the signature, use that - entry. If the hash table entry at index H is unused (all zeroes), - terminate the search: the signature is not present in the table. - - 4) Let H = (H + H') modulo M. Repeat at Step 3. - - Because M > N and H' and M are relatively prime, the search is guaranteed - to stop at an unused slot or find the match. */ - -/* Create a hash table to map DWO IDs to their CU/TU entry in - .debug_{info,types}.dwo in DWP_FILE. - Returns NULL if there isn't one. - Note: This function processes DWP files only, not DWO files. */ - -static struct dwp_hash_table * -create_dwp_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile, - struct dwp_file *dwp_file, int is_debug_types) -{ - struct objfile *objfile = dwarf2_per_objfile->objfile; - bfd *dbfd = dwp_file->dbfd.get (); - const gdb_byte *index_ptr, *index_end; - struct dwarf2_section_info *index; - uint32_t version, nr_columns, nr_units, nr_slots; - struct dwp_hash_table *htab; - - if (is_debug_types) - index = &dwp_file->sections.tu_index; - else - index = &dwp_file->sections.cu_index; - - if (index->empty ()) - return NULL; - index->read (objfile); - - index_ptr = index->buffer; - index_end = index_ptr + index->size; - - version = read_4_bytes (dbfd, index_ptr); - index_ptr += 4; - if (version == 2) - nr_columns = read_4_bytes (dbfd, index_ptr); - else - nr_columns = 0; - index_ptr += 4; - nr_units = read_4_bytes (dbfd, index_ptr); - index_ptr += 4; - nr_slots = read_4_bytes (dbfd, index_ptr); - index_ptr += 4; - - if (version != 1 && version != 2) - { - error (_("Dwarf Error: unsupported DWP file version (%s)" - " [in module %s]"), - pulongest (version), dwp_file->name); - } - if (nr_slots != (nr_slots & -nr_slots)) - { - error (_("Dwarf Error: number of slots in DWP hash table (%s)" - " is not power of 2 [in module %s]"), - pulongest (nr_slots), dwp_file->name); - } - - htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table); - htab->version = version; - htab->nr_columns = nr_columns; - htab->nr_units = nr_units; - htab->nr_slots = nr_slots; - htab->hash_table = index_ptr; - htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots; - - /* Exit early if the table is empty. */ - if (nr_slots == 0 || nr_units == 0 - || (version == 2 && nr_columns == 0)) - { - /* All must be zero. */ - if (nr_slots != 0 || nr_units != 0 - || (version == 2 && nr_columns != 0)) - { - complaint (_("Empty DWP but nr_slots,nr_units,nr_columns not" - " all zero [in modules %s]"), - dwp_file->name); - } - return htab; - } - - if (version == 1) - { - htab->section_pool.v1.indices = - htab->unit_table + sizeof (uint32_t) * nr_slots; - /* It's harder to decide whether the section is too small in v1. - V1 is deprecated anyway so we punt. */ - } - else - { - const gdb_byte *ids_ptr = htab->unit_table + sizeof (uint32_t) * nr_slots; - int *ids = htab->section_pool.v2.section_ids; - size_t sizeof_ids = sizeof (htab->section_pool.v2.section_ids); - /* Reverse map for error checking. */ - int ids_seen[DW_SECT_MAX + 1]; - int i; - - if (nr_columns < 2) - { - error (_("Dwarf Error: bad DWP hash table, too few columns" - " in section table [in module %s]"), - dwp_file->name); - } - if (nr_columns > MAX_NR_V2_DWO_SECTIONS) - { - error (_("Dwarf Error: bad DWP hash table, too many columns" - " in section table [in module %s]"), - dwp_file->name); - } - memset (ids, 255, sizeof_ids); - memset (ids_seen, 255, sizeof (ids_seen)); - for (i = 0; i < nr_columns; ++i) - { - int id = read_4_bytes (dbfd, ids_ptr + i * sizeof (uint32_t)); - - if (id < DW_SECT_MIN || id > DW_SECT_MAX) - { - error (_("Dwarf Error: bad DWP hash table, bad section id %d" - " in section table [in module %s]"), - id, dwp_file->name); - } - if (ids_seen[id] != -1) - { - error (_("Dwarf Error: bad DWP hash table, duplicate section" - " id %d in section table [in module %s]"), - id, dwp_file->name); - } - ids_seen[id] = i; - ids[i] = id; - } - /* Must have exactly one info or types section. */ - if (((ids_seen[DW_SECT_INFO] != -1) - + (ids_seen[DW_SECT_TYPES] != -1)) - != 1) - { - error (_("Dwarf Error: bad DWP hash table, missing/duplicate" - " DWO info/types section [in module %s]"), - dwp_file->name); - } - /* Must have an abbrev section. */ - if (ids_seen[DW_SECT_ABBREV] == -1) - { - error (_("Dwarf Error: bad DWP hash table, missing DWO abbrev" - " section [in module %s]"), - dwp_file->name); - } - htab->section_pool.v2.offsets = ids_ptr + sizeof (uint32_t) * nr_columns; - htab->section_pool.v2.sizes = - htab->section_pool.v2.offsets + (sizeof (uint32_t) - * nr_units * nr_columns); - if ((htab->section_pool.v2.sizes + (sizeof (uint32_t) - * nr_units * nr_columns)) - > index_end) - { - error (_("Dwarf Error: DWP index section is corrupt (too small)" - " [in module %s]"), - dwp_file->name); - } - } - - return htab; -} - -/* Update SECTIONS with the data from SECTP. - - This function is like the other "locate" section routines that are - passed to bfd_map_over_sections, but in this context the sections to - read comes from the DWP V1 hash table, not the full ELF section table. - - The result is non-zero for success, or zero if an error was found. */ - -static int -locate_v1_virtual_dwo_sections (asection *sectp, - struct virtual_v1_dwo_sections *sections) -{ - const struct dwop_section_names *names = &dwop_section_names; - - if (section_is_p (sectp->name, &names->abbrev_dwo)) - { - /* There can be only one. */ - if (sections->abbrev.s.section != NULL) - return 0; - sections->abbrev.s.section = sectp; - sections->abbrev.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names->info_dwo) - || section_is_p (sectp->name, &names->types_dwo)) - { - /* There can be only one. */ - if (sections->info_or_types.s.section != NULL) - return 0; - sections->info_or_types.s.section = sectp; - sections->info_or_types.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names->line_dwo)) - { - /* There can be only one. */ - if (sections->line.s.section != NULL) - return 0; - sections->line.s.section = sectp; - sections->line.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names->loc_dwo)) - { - /* There can be only one. */ - if (sections->loc.s.section != NULL) - return 0; - sections->loc.s.section = sectp; - sections->loc.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names->macinfo_dwo)) - { - /* There can be only one. */ - if (sections->macinfo.s.section != NULL) - return 0; - sections->macinfo.s.section = sectp; - sections->macinfo.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names->macro_dwo)) - { - /* There can be only one. */ - if (sections->macro.s.section != NULL) - return 0; - sections->macro.s.section = sectp; - sections->macro.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names->str_offsets_dwo)) - { - /* There can be only one. */ - if (sections->str_offsets.s.section != NULL) - return 0; - sections->str_offsets.s.section = sectp; - sections->str_offsets.size = bfd_section_size (sectp); - } - else - { - /* No other kind of section is valid. */ - return 0; - } - - return 1; -} - -/* Create a dwo_unit object for the DWO unit with signature SIGNATURE. - UNIT_INDEX is the index of the DWO unit in the DWP hash table. - COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU. - This is for DWP version 1 files. */ - -static struct dwo_unit * -create_dwo_unit_in_dwp_v1 (struct dwarf2_per_objfile *dwarf2_per_objfile, - struct dwp_file *dwp_file, - uint32_t unit_index, - const char *comp_dir, - ULONGEST signature, int is_debug_types) -{ - struct objfile *objfile = dwarf2_per_objfile->objfile; - const struct dwp_hash_table *dwp_htab = - is_debug_types ? dwp_file->tus : dwp_file->cus; - bfd *dbfd = dwp_file->dbfd.get (); - const char *kind = is_debug_types ? "TU" : "CU"; - struct dwo_file *dwo_file; - struct dwo_unit *dwo_unit; - struct virtual_v1_dwo_sections sections; - void **dwo_file_slot; - int i; - - gdb_assert (dwp_file->version == 1); - - if (dwarf_read_debug) - { - fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V1 file: %s\n", - kind, - pulongest (unit_index), hex_string (signature), - dwp_file->name); - } - - /* Fetch the sections of this DWO unit. - Put a limit on the number of sections we look for so that bad data - doesn't cause us to loop forever. */ - -#define MAX_NR_V1_DWO_SECTIONS \ - (1 /* .debug_info or .debug_types */ \ - + 1 /* .debug_abbrev */ \ - + 1 /* .debug_line */ \ - + 1 /* .debug_loc */ \ - + 1 /* .debug_str_offsets */ \ - + 1 /* .debug_macro or .debug_macinfo */ \ - + 1 /* trailing zero */) - - memset (§ions, 0, sizeof (sections)); - - for (i = 0; i < MAX_NR_V1_DWO_SECTIONS; ++i) - { - asection *sectp; - uint32_t section_nr = - read_4_bytes (dbfd, - dwp_htab->section_pool.v1.indices - + (unit_index + i) * sizeof (uint32_t)); - - if (section_nr == 0) - break; - if (section_nr >= dwp_file->num_sections) - { - error (_("Dwarf Error: bad DWP hash table, section number too large" - " [in module %s]"), - dwp_file->name); - } - - sectp = dwp_file->elf_sections[section_nr]; - if (! locate_v1_virtual_dwo_sections (sectp, §ions)) - { - error (_("Dwarf Error: bad DWP hash table, invalid section found" - " [in module %s]"), - dwp_file->name); - } - } - - if (i < 2 - || sections.info_or_types.empty () - || sections.abbrev.empty ()) - { - error (_("Dwarf Error: bad DWP hash table, missing DWO sections" - " [in module %s]"), - dwp_file->name); - } - if (i == MAX_NR_V1_DWO_SECTIONS) - { - error (_("Dwarf Error: bad DWP hash table, too many DWO sections" - " [in module %s]"), - dwp_file->name); - } - - /* It's easier for the rest of the code if we fake a struct dwo_file and - have dwo_unit "live" in that. At least for now. - - The DWP file can be made up of a random collection of CUs and TUs. - However, for each CU + set of TUs that came from the same original DWO - file, we can combine them back into a virtual DWO file to save space - (fewer struct dwo_file objects to allocate). Remember that for really - large apps there can be on the order of 8K CUs and 200K TUs, or more. */ - - std::string virtual_dwo_name = - string_printf ("virtual-dwo/%d-%d-%d-%d", - sections.abbrev.get_id (), - sections.line.get_id (), - sections.loc.get_id (), - sections.str_offsets.get_id ()); - /* Can we use an existing virtual DWO file? */ - dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile, - virtual_dwo_name.c_str (), - comp_dir); - /* Create one if necessary. */ - if (*dwo_file_slot == NULL) - { - if (dwarf_read_debug) - { - fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n", - virtual_dwo_name.c_str ()); - } - dwo_file = new struct dwo_file; - dwo_file->dwo_name = obstack_strdup (&objfile->objfile_obstack, - virtual_dwo_name); - dwo_file->comp_dir = comp_dir; - dwo_file->sections.abbrev = sections.abbrev; - dwo_file->sections.line = sections.line; - dwo_file->sections.loc = sections.loc; - dwo_file->sections.macinfo = sections.macinfo; - dwo_file->sections.macro = sections.macro; - dwo_file->sections.str_offsets = sections.str_offsets; - /* The "str" section is global to the entire DWP file. */ - dwo_file->sections.str = dwp_file->sections.str; - /* The info or types section is assigned below to dwo_unit, - there's no need to record it in dwo_file. - Also, we can't simply record type sections in dwo_file because - we record a pointer into the vector in dwo_unit. As we collect more - types we'll grow the vector and eventually have to reallocate space - for it, invalidating all copies of pointers into the previous - contents. */ - *dwo_file_slot = dwo_file; - } - else - { - if (dwarf_read_debug) - { - fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n", - virtual_dwo_name.c_str ()); - } - dwo_file = (struct dwo_file *) *dwo_file_slot; - } - - dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit); - dwo_unit->dwo_file = dwo_file; - dwo_unit->signature = signature; - dwo_unit->section = - XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info); - *dwo_unit->section = sections.info_or_types; - /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */ - - return dwo_unit; -} - -/* Subroutine of create_dwo_unit_in_dwp_v2 to simplify it. - Given a pointer to the containing section SECTION, and OFFSET,SIZE of the - piece within that section used by a TU/CU, return a virtual section - of just that piece. */ - -static struct dwarf2_section_info -create_dwp_v2_section (struct dwarf2_per_objfile *dwarf2_per_objfile, - struct dwarf2_section_info *section, - bfd_size_type offset, bfd_size_type size) -{ - struct dwarf2_section_info result; - asection *sectp; - - gdb_assert (section != NULL); - gdb_assert (!section->is_virtual); - - memset (&result, 0, sizeof (result)); - result.s.containing_section = section; - result.is_virtual = true; - - if (size == 0) - return result; - - sectp = section->get_bfd_section (); - - /* Flag an error if the piece denoted by OFFSET,SIZE is outside the - bounds of the real section. This is a pretty-rare event, so just - flag an error (easier) instead of a warning and trying to cope. */ - if (sectp == NULL - || offset + size > bfd_section_size (sectp)) - { - error (_("Dwarf Error: Bad DWP V2 section info, doesn't fit" - " in section %s [in module %s]"), - sectp ? bfd_section_name (sectp) : "<unknown>", - objfile_name (dwarf2_per_objfile->objfile)); - } - - result.virtual_offset = offset; - result.size = size; - return result; -} - -/* Create a dwo_unit object for the DWO unit with signature SIGNATURE. - UNIT_INDEX is the index of the DWO unit in the DWP hash table. - COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU. - This is for DWP version 2 files. */ - -static struct dwo_unit * -create_dwo_unit_in_dwp_v2 (struct dwarf2_per_objfile *dwarf2_per_objfile, - struct dwp_file *dwp_file, - uint32_t unit_index, - const char *comp_dir, - ULONGEST signature, int is_debug_types) -{ - struct objfile *objfile = dwarf2_per_objfile->objfile; - const struct dwp_hash_table *dwp_htab = - is_debug_types ? dwp_file->tus : dwp_file->cus; - bfd *dbfd = dwp_file->dbfd.get (); - const char *kind = is_debug_types ? "TU" : "CU"; - struct dwo_file *dwo_file; - struct dwo_unit *dwo_unit; - struct virtual_v2_dwo_sections sections; - void **dwo_file_slot; - int i; - - gdb_assert (dwp_file->version == 2); - - if (dwarf_read_debug) - { - fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V2 file: %s\n", - kind, - pulongest (unit_index), hex_string (signature), - dwp_file->name); - } - - /* Fetch the section offsets of this DWO unit. */ - - memset (§ions, 0, sizeof (sections)); - - for (i = 0; i < dwp_htab->nr_columns; ++i) - { - uint32_t offset = read_4_bytes (dbfd, - dwp_htab->section_pool.v2.offsets - + (((unit_index - 1) * dwp_htab->nr_columns - + i) - * sizeof (uint32_t))); - uint32_t size = read_4_bytes (dbfd, - dwp_htab->section_pool.v2.sizes - + (((unit_index - 1) * dwp_htab->nr_columns - + i) - * sizeof (uint32_t))); - - switch (dwp_htab->section_pool.v2.section_ids[i]) - { - case DW_SECT_INFO: - case DW_SECT_TYPES: - sections.info_or_types_offset = offset; - sections.info_or_types_size = size; - break; - case DW_SECT_ABBREV: - sections.abbrev_offset = offset; - sections.abbrev_size = size; - break; - case DW_SECT_LINE: - sections.line_offset = offset; - sections.line_size = size; - break; - case DW_SECT_LOC: - sections.loc_offset = offset; - sections.loc_size = size; - break; - case DW_SECT_STR_OFFSETS: - sections.str_offsets_offset = offset; - sections.str_offsets_size = size; - break; - case DW_SECT_MACINFO: - sections.macinfo_offset = offset; - sections.macinfo_size = size; - break; - case DW_SECT_MACRO: - sections.macro_offset = offset; - sections.macro_size = size; - break; - } - } - - /* It's easier for the rest of the code if we fake a struct dwo_file and - have dwo_unit "live" in that. At least for now. - - The DWP file can be made up of a random collection of CUs and TUs. - However, for each CU + set of TUs that came from the same original DWO - file, we can combine them back into a virtual DWO file to save space - (fewer struct dwo_file objects to allocate). Remember that for really - large apps there can be on the order of 8K CUs and 200K TUs, or more. */ - - std::string virtual_dwo_name = - string_printf ("virtual-dwo/%ld-%ld-%ld-%ld", - (long) (sections.abbrev_size ? sections.abbrev_offset : 0), - (long) (sections.line_size ? sections.line_offset : 0), - (long) (sections.loc_size ? sections.loc_offset : 0), - (long) (sections.str_offsets_size - ? sections.str_offsets_offset : 0)); - /* Can we use an existing virtual DWO file? */ - dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile, - virtual_dwo_name.c_str (), - comp_dir); - /* Create one if necessary. */ - if (*dwo_file_slot == NULL) - { - if (dwarf_read_debug) - { - fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n", - virtual_dwo_name.c_str ()); - } - dwo_file = new struct dwo_file; - dwo_file->dwo_name = obstack_strdup (&objfile->objfile_obstack, - virtual_dwo_name); - dwo_file->comp_dir = comp_dir; - dwo_file->sections.abbrev = - create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.abbrev, - sections.abbrev_offset, sections.abbrev_size); - dwo_file->sections.line = - create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.line, - sections.line_offset, sections.line_size); - dwo_file->sections.loc = - create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.loc, - sections.loc_offset, sections.loc_size); - dwo_file->sections.macinfo = - create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.macinfo, - sections.macinfo_offset, sections.macinfo_size); - dwo_file->sections.macro = - create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.macro, - sections.macro_offset, sections.macro_size); - dwo_file->sections.str_offsets = - create_dwp_v2_section (dwarf2_per_objfile, - &dwp_file->sections.str_offsets, - sections.str_offsets_offset, - sections.str_offsets_size); - /* The "str" section is global to the entire DWP file. */ - dwo_file->sections.str = dwp_file->sections.str; - /* The info or types section is assigned below to dwo_unit, - there's no need to record it in dwo_file. - Also, we can't simply record type sections in dwo_file because - we record a pointer into the vector in dwo_unit. As we collect more - types we'll grow the vector and eventually have to reallocate space - for it, invalidating all copies of pointers into the previous - contents. */ - *dwo_file_slot = dwo_file; - } - else - { - if (dwarf_read_debug) - { - fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n", - virtual_dwo_name.c_str ()); - } - dwo_file = (struct dwo_file *) *dwo_file_slot; - } - - dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit); - dwo_unit->dwo_file = dwo_file; - dwo_unit->signature = signature; - dwo_unit->section = - XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info); - *dwo_unit->section = create_dwp_v2_section (dwarf2_per_objfile, - is_debug_types - ? &dwp_file->sections.types - : &dwp_file->sections.info, - sections.info_or_types_offset, - sections.info_or_types_size); - /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */ - - return dwo_unit; -} - -/* Lookup the DWO unit with SIGNATURE in DWP_FILE. - Returns NULL if the signature isn't found. */ - -static struct dwo_unit * -lookup_dwo_unit_in_dwp (struct dwarf2_per_objfile *dwarf2_per_objfile, - struct dwp_file *dwp_file, const char *comp_dir, - ULONGEST signature, int is_debug_types) -{ - const struct dwp_hash_table *dwp_htab = - is_debug_types ? dwp_file->tus : dwp_file->cus; - bfd *dbfd = dwp_file->dbfd.get (); - uint32_t mask = dwp_htab->nr_slots - 1; - uint32_t hash = signature & mask; - uint32_t hash2 = ((signature >> 32) & mask) | 1; - unsigned int i; - void **slot; - struct dwo_unit find_dwo_cu; - - memset (&find_dwo_cu, 0, sizeof (find_dwo_cu)); - find_dwo_cu.signature = signature; - slot = htab_find_slot (is_debug_types - ? dwp_file->loaded_tus - : dwp_file->loaded_cus, - &find_dwo_cu, INSERT); - - if (*slot != NULL) - return (struct dwo_unit *) *slot; - - /* Use a for loop so that we don't loop forever on bad debug info. */ - for (i = 0; i < dwp_htab->nr_slots; ++i) - { - ULONGEST signature_in_table; - - signature_in_table = - read_8_bytes (dbfd, dwp_htab->hash_table + hash * sizeof (uint64_t)); - if (signature_in_table == signature) - { - uint32_t unit_index = - read_4_bytes (dbfd, - dwp_htab->unit_table + hash * sizeof (uint32_t)); - - if (dwp_file->version == 1) - { - *slot = create_dwo_unit_in_dwp_v1 (dwarf2_per_objfile, - dwp_file, unit_index, - comp_dir, signature, - is_debug_types); - } - else - { - *slot = create_dwo_unit_in_dwp_v2 (dwarf2_per_objfile, - dwp_file, unit_index, - comp_dir, signature, - is_debug_types); - } - return (struct dwo_unit *) *slot; - } - if (signature_in_table == 0) - return NULL; - hash = (hash + hash2) & mask; - } - - error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate" - " [in module %s]"), - dwp_file->name); -} - -/* Subroutine of open_dwo_file,open_dwp_file to simplify them. - Open the file specified by FILE_NAME and hand it off to BFD for - preliminary analysis. Return a newly initialized bfd *, which - includes a canonicalized copy of FILE_NAME. - If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file. - SEARCH_CWD is true if the current directory is to be searched. - It will be searched before debug-file-directory. - If successful, the file is added to the bfd include table of the - objfile's bfd (see gdb_bfd_record_inclusion). - If unable to find/open the file, return NULL. - NOTE: This function is derived from symfile_bfd_open. */ - -static gdb_bfd_ref_ptr -try_open_dwop_file (struct dwarf2_per_objfile *dwarf2_per_objfile, - const char *file_name, int is_dwp, int search_cwd) -{ - int desc; - /* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if - FILE_NAME contains a '/'. So we can't use it. Instead prepend "." - to debug_file_directory. */ - const char *search_path; - static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' }; - - gdb::unique_xmalloc_ptr<char> search_path_holder; - if (search_cwd) - { - if (*debug_file_directory != '\0') - { - search_path_holder.reset (concat (".", dirname_separator_string, - debug_file_directory, - (char *) NULL)); - search_path = search_path_holder.get (); - } - else - search_path = "."; - } - else - search_path = debug_file_directory; - - openp_flags flags = OPF_RETURN_REALPATH; - if (is_dwp) - flags |= OPF_SEARCH_IN_PATH; - - gdb::unique_xmalloc_ptr<char> absolute_name; - desc = openp (search_path, flags, file_name, - O_RDONLY | O_BINARY, &absolute_name); - if (desc < 0) - return NULL; - - gdb_bfd_ref_ptr sym_bfd (gdb_bfd_open (absolute_name.get (), - gnutarget, desc)); - if (sym_bfd == NULL) - return NULL; - bfd_set_cacheable (sym_bfd.get (), 1); - - if (!bfd_check_format (sym_bfd.get (), bfd_object)) - return NULL; - - /* Success. Record the bfd as having been included by the objfile's bfd. - This is important because things like demangled_names_hash lives in the - objfile's per_bfd space and may have references to things like symbol - names that live in the DWO/DWP file's per_bfd space. PR 16426. */ - gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, sym_bfd.get ()); - - return sym_bfd; -} - -/* Try to open DWO file FILE_NAME. - COMP_DIR is the DW_AT_comp_dir attribute. - The result is the bfd handle of the file. - If there is a problem finding or opening the file, return NULL. - Upon success, the canonicalized path of the file is stored in the bfd, - same as symfile_bfd_open. */ - -static gdb_bfd_ref_ptr -open_dwo_file (struct dwarf2_per_objfile *dwarf2_per_objfile, - const char *file_name, const char *comp_dir) -{ - if (IS_ABSOLUTE_PATH (file_name)) - return try_open_dwop_file (dwarf2_per_objfile, file_name, - 0 /*is_dwp*/, 0 /*search_cwd*/); - - /* Before trying the search path, try DWO_NAME in COMP_DIR. */ - - if (comp_dir != NULL) - { - gdb::unique_xmalloc_ptr<char> path_to_try - (concat (comp_dir, SLASH_STRING, file_name, (char *) NULL)); - - /* NOTE: If comp_dir is a relative path, this will also try the - search path, which seems useful. */ - gdb_bfd_ref_ptr abfd (try_open_dwop_file (dwarf2_per_objfile, - path_to_try.get (), - 0 /*is_dwp*/, - 1 /*search_cwd*/)); - if (abfd != NULL) - return abfd; - } - - /* That didn't work, try debug-file-directory, which, despite its name, - is a list of paths. */ - - if (*debug_file_directory == '\0') - return NULL; - - return try_open_dwop_file (dwarf2_per_objfile, file_name, - 0 /*is_dwp*/, 1 /*search_cwd*/); -} - -/* This function is mapped across the sections and remembers the offset and - size of each of the DWO debugging sections we are interested in. */ - -static void -dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr) -{ - struct dwo_sections *dwo_sections = (struct dwo_sections *) dwo_sections_ptr; - const struct dwop_section_names *names = &dwop_section_names; - - if (section_is_p (sectp->name, &names->abbrev_dwo)) - { - dwo_sections->abbrev.s.section = sectp; - dwo_sections->abbrev.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names->info_dwo)) - { - dwo_sections->info.s.section = sectp; - dwo_sections->info.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names->line_dwo)) - { - dwo_sections->line.s.section = sectp; - dwo_sections->line.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names->loc_dwo)) - { - dwo_sections->loc.s.section = sectp; - dwo_sections->loc.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names->macinfo_dwo)) - { - dwo_sections->macinfo.s.section = sectp; - dwo_sections->macinfo.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names->macro_dwo)) - { - dwo_sections->macro.s.section = sectp; - dwo_sections->macro.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names->str_dwo)) - { - dwo_sections->str.s.section = sectp; - dwo_sections->str.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names->str_offsets_dwo)) - { - dwo_sections->str_offsets.s.section = sectp; - dwo_sections->str_offsets.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names->types_dwo)) - { - struct dwarf2_section_info type_section; - - memset (&type_section, 0, sizeof (type_section)); - type_section.s.section = sectp; - type_section.size = bfd_section_size (sectp); - dwo_sections->types.push_back (type_section); - } -} - -/* Initialize the use of the DWO file specified by DWO_NAME and referenced - by PER_CU. This is for the non-DWP case. - The result is NULL if DWO_NAME can't be found. */ - -static struct dwo_file * -open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu, - const char *dwo_name, const char *comp_dir) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile; - - gdb_bfd_ref_ptr dbfd = open_dwo_file (dwarf2_per_objfile, dwo_name, comp_dir); - if (dbfd == NULL) - { - if (dwarf_read_debug) - fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name); - return NULL; - } - - dwo_file_up dwo_file (new struct dwo_file); - dwo_file->dwo_name = dwo_name; - dwo_file->comp_dir = comp_dir; - dwo_file->dbfd = std::move (dbfd); - - bfd_map_over_sections (dwo_file->dbfd.get (), dwarf2_locate_dwo_sections, - &dwo_file->sections); - - create_cus_hash_table (dwarf2_per_objfile, per_cu->cu, *dwo_file, - dwo_file->sections.info, dwo_file->cus); - - create_debug_types_hash_table (dwarf2_per_objfile, dwo_file.get (), - dwo_file->sections.types, dwo_file->tus); - - if (dwarf_read_debug) - fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name); - - return dwo_file.release (); -} - -/* This function is mapped across the sections and remembers the offset and - size of each of the DWP debugging sections common to version 1 and 2 that - we are interested in. */ - -static void -dwarf2_locate_common_dwp_sections (bfd *abfd, asection *sectp, - void *dwp_file_ptr) -{ - struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr; - const struct dwop_section_names *names = &dwop_section_names; - unsigned int elf_section_nr = elf_section_data (sectp)->this_idx; - - /* Record the ELF section number for later lookup: this is what the - .debug_cu_index,.debug_tu_index tables use in DWP V1. */ - gdb_assert (elf_section_nr < dwp_file->num_sections); - dwp_file->elf_sections[elf_section_nr] = sectp; - - /* Look for specific sections that we need. */ - if (section_is_p (sectp->name, &names->str_dwo)) - { - dwp_file->sections.str.s.section = sectp; - dwp_file->sections.str.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names->cu_index)) - { - dwp_file->sections.cu_index.s.section = sectp; - dwp_file->sections.cu_index.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names->tu_index)) - { - dwp_file->sections.tu_index.s.section = sectp; - dwp_file->sections.tu_index.size = bfd_section_size (sectp); - } -} - -/* This function is mapped across the sections and remembers the offset and - size of each of the DWP version 2 debugging sections that we are interested - in. This is split into a separate function because we don't know if we - have version 1 or 2 until we parse the cu_index/tu_index sections. */ - -static void -dwarf2_locate_v2_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr) -{ - struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr; - const struct dwop_section_names *names = &dwop_section_names; - unsigned int elf_section_nr = elf_section_data (sectp)->this_idx; - - /* Record the ELF section number for later lookup: this is what the - .debug_cu_index,.debug_tu_index tables use in DWP V1. */ - gdb_assert (elf_section_nr < dwp_file->num_sections); - dwp_file->elf_sections[elf_section_nr] = sectp; - - /* Look for specific sections that we need. */ - if (section_is_p (sectp->name, &names->abbrev_dwo)) - { - dwp_file->sections.abbrev.s.section = sectp; - dwp_file->sections.abbrev.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names->info_dwo)) - { - dwp_file->sections.info.s.section = sectp; - dwp_file->sections.info.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names->line_dwo)) - { - dwp_file->sections.line.s.section = sectp; - dwp_file->sections.line.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names->loc_dwo)) - { - dwp_file->sections.loc.s.section = sectp; - dwp_file->sections.loc.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names->macinfo_dwo)) - { - dwp_file->sections.macinfo.s.section = sectp; - dwp_file->sections.macinfo.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names->macro_dwo)) - { - dwp_file->sections.macro.s.section = sectp; - dwp_file->sections.macro.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names->str_offsets_dwo)) - { - dwp_file->sections.str_offsets.s.section = sectp; - dwp_file->sections.str_offsets.size = bfd_section_size (sectp); - } - else if (section_is_p (sectp->name, &names->types_dwo)) - { - dwp_file->sections.types.s.section = sectp; - dwp_file->sections.types.size = bfd_section_size (sectp); - } -} - -/* Hash function for dwp_file loaded CUs/TUs. */ - -static hashval_t -hash_dwp_loaded_cutus (const void *item) -{ - const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item; - - /* This drops the top 32 bits of the signature, but is ok for a hash. */ - return dwo_unit->signature; -} - -/* Equality function for dwp_file loaded CUs/TUs. */ - -static int -eq_dwp_loaded_cutus (const void *a, const void *b) -{ - const struct dwo_unit *dua = (const struct dwo_unit *) a; - const struct dwo_unit *dub = (const struct dwo_unit *) b; - - return dua->signature == dub->signature; -} - -/* Allocate a hash table for dwp_file loaded CUs/TUs. */ - -static htab_t -allocate_dwp_loaded_cutus_table (struct objfile *objfile) -{ - return htab_create_alloc_ex (3, - hash_dwp_loaded_cutus, - eq_dwp_loaded_cutus, - NULL, - &objfile->objfile_obstack, - hashtab_obstack_allocate, - dummy_obstack_deallocate); -} - -/* Try to open DWP file FILE_NAME. - The result is the bfd handle of the file. - If there is a problem finding or opening the file, return NULL. - Upon success, the canonicalized path of the file is stored in the bfd, - same as symfile_bfd_open. */ - -static gdb_bfd_ref_ptr -open_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile, - const char *file_name) -{ - gdb_bfd_ref_ptr abfd (try_open_dwop_file (dwarf2_per_objfile, file_name, - 1 /*is_dwp*/, - 1 /*search_cwd*/)); - if (abfd != NULL) - return abfd; - - /* Work around upstream bug 15652. - http://sourceware.org/bugzilla/show_bug.cgi?id=15652 - [Whether that's a "bug" is debatable, but it is getting in our way.] - We have no real idea where the dwp file is, because gdb's realpath-ing - of the executable's path may have discarded the needed info. - [IWBN if the dwp file name was recorded in the executable, akin to - .gnu_debuglink, but that doesn't exist yet.] - Strip the directory from FILE_NAME and search again. */ - if (*debug_file_directory != '\0') - { - /* Don't implicitly search the current directory here. - If the user wants to search "." to handle this case, - it must be added to debug-file-directory. */ - return try_open_dwop_file (dwarf2_per_objfile, - lbasename (file_name), 1 /*is_dwp*/, - 0 /*search_cwd*/); - } - - return NULL; -} - -/* Initialize the use of the DWP file for the current objfile. - By convention the name of the DWP file is ${objfile}.dwp. - The result is NULL if it can't be found. */ - -static std::unique_ptr<struct dwp_file> -open_and_init_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile) -{ - struct objfile *objfile = dwarf2_per_objfile->objfile; - - /* Try to find first .dwp for the binary file before any symbolic links - resolving. */ - - /* If the objfile is a debug file, find the name of the real binary - file and get the name of dwp file from there. */ - std::string dwp_name; - if (objfile->separate_debug_objfile_backlink != NULL) - { - struct objfile *backlink = objfile->separate_debug_objfile_backlink; - const char *backlink_basename = lbasename (backlink->original_name); - - dwp_name = ldirname (objfile->original_name) + SLASH_STRING + backlink_basename; - } - else - dwp_name = objfile->original_name; - - dwp_name += ".dwp"; - - gdb_bfd_ref_ptr dbfd (open_dwp_file (dwarf2_per_objfile, dwp_name.c_str ())); - if (dbfd == NULL - && strcmp (objfile->original_name, objfile_name (objfile)) != 0) - { - /* Try to find .dwp for the binary file after gdb_realpath resolving. */ - dwp_name = objfile_name (objfile); - dwp_name += ".dwp"; - dbfd = open_dwp_file (dwarf2_per_objfile, dwp_name.c_str ()); - } - - if (dbfd == NULL) - { - if (dwarf_read_debug) - fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name.c_str ()); - return std::unique_ptr<dwp_file> (); - } - - const char *name = bfd_get_filename (dbfd.get ()); - std::unique_ptr<struct dwp_file> dwp_file - (new struct dwp_file (name, std::move (dbfd))); - - dwp_file->num_sections = elf_numsections (dwp_file->dbfd); - dwp_file->elf_sections = - OBSTACK_CALLOC (&objfile->objfile_obstack, - dwp_file->num_sections, asection *); - - bfd_map_over_sections (dwp_file->dbfd.get (), - dwarf2_locate_common_dwp_sections, - dwp_file.get ()); - - dwp_file->cus = create_dwp_hash_table (dwarf2_per_objfile, dwp_file.get (), - 0); - - dwp_file->tus = create_dwp_hash_table (dwarf2_per_objfile, dwp_file.get (), - 1); - - /* The DWP file version is stored in the hash table. Oh well. */ - if (dwp_file->cus && dwp_file->tus - && dwp_file->cus->version != dwp_file->tus->version) - { - /* Technically speaking, we should try to limp along, but this is - pretty bizarre. We use pulongest here because that's the established - portability solution (e.g, we cannot use %u for uint32_t). */ - error (_("Dwarf Error: DWP file CU version %s doesn't match" - " TU version %s [in DWP file %s]"), - pulongest (dwp_file->cus->version), - pulongest (dwp_file->tus->version), dwp_name.c_str ()); - } - - if (dwp_file->cus) - dwp_file->version = dwp_file->cus->version; - else if (dwp_file->tus) - dwp_file->version = dwp_file->tus->version; - else - dwp_file->version = 2; - - if (dwp_file->version == 2) - bfd_map_over_sections (dwp_file->dbfd.get (), - dwarf2_locate_v2_dwp_sections, - dwp_file.get ()); - - dwp_file->loaded_cus = allocate_dwp_loaded_cutus_table (objfile); - dwp_file->loaded_tus = allocate_dwp_loaded_cutus_table (objfile); - - if (dwarf_read_debug) - { - fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name); - fprintf_unfiltered (gdb_stdlog, - " %s CUs, %s TUs\n", - pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0), - pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0)); - } - - return dwp_file; -} - -/* Wrapper around open_and_init_dwp_file, only open it once. */ - -static struct dwp_file * -get_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile) -{ - if (! dwarf2_per_objfile->dwp_checked) - { - dwarf2_per_objfile->dwp_file - = open_and_init_dwp_file (dwarf2_per_objfile); - dwarf2_per_objfile->dwp_checked = 1; - } - return dwarf2_per_objfile->dwp_file.get (); -} - -/* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit. - Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME - or in the DWP file for the objfile, referenced by THIS_UNIT. - If non-NULL, comp_dir is the DW_AT_comp_dir attribute. - IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU. - - This is called, for example, when wanting to read a variable with a - complex location. Therefore we don't want to do file i/o for every call. - Therefore we don't want to look for a DWO file on every call. - Therefore we first see if we've already seen SIGNATURE in a DWP file, - then we check if we've already seen DWO_NAME, and only THEN do we check - for a DWO file. - - The result is a pointer to the dwo_unit object or NULL if we didn't find it - (dwo_id mismatch or couldn't find the DWO/DWP file). */ - -static struct dwo_unit * -lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit, - const char *dwo_name, const char *comp_dir, - ULONGEST signature, int is_debug_types) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile = this_unit->dwarf2_per_objfile; - struct objfile *objfile = dwarf2_per_objfile->objfile; - const char *kind = is_debug_types ? "TU" : "CU"; - void **dwo_file_slot; - struct dwo_file *dwo_file; - struct dwp_file *dwp_file; - - /* First see if there's a DWP file. - If we have a DWP file but didn't find the DWO inside it, don't - look for the original DWO file. It makes gdb behave differently - depending on whether one is debugging in the build tree. */ - - dwp_file = get_dwp_file (dwarf2_per_objfile); - if (dwp_file != NULL) - { - const struct dwp_hash_table *dwp_htab = - is_debug_types ? dwp_file->tus : dwp_file->cus; - - if (dwp_htab != NULL) - { - struct dwo_unit *dwo_cutu = - lookup_dwo_unit_in_dwp (dwarf2_per_objfile, dwp_file, comp_dir, - signature, is_debug_types); - - if (dwo_cutu != NULL) - { - if (dwarf_read_debug) - { - fprintf_unfiltered (gdb_stdlog, - "Virtual DWO %s %s found: @%s\n", - kind, hex_string (signature), - host_address_to_string (dwo_cutu)); - } - return dwo_cutu; - } - } - } - else - { - /* No DWP file, look for the DWO file. */ - - dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile, - dwo_name, comp_dir); - if (*dwo_file_slot == NULL) - { - /* Read in the file and build a table of the CUs/TUs it contains. */ - *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir); - } - /* NOTE: This will be NULL if unable to open the file. */ - dwo_file = (struct dwo_file *) *dwo_file_slot; - - if (dwo_file != NULL) - { - struct dwo_unit *dwo_cutu = NULL; - - if (is_debug_types && dwo_file->tus) - { - struct dwo_unit find_dwo_cutu; - - memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu)); - find_dwo_cutu.signature = signature; - dwo_cutu - = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_cutu); - } - else if (!is_debug_types && dwo_file->cus) - { - struct dwo_unit find_dwo_cutu; - - memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu)); - find_dwo_cutu.signature = signature; - dwo_cutu = (struct dwo_unit *)htab_find (dwo_file->cus, - &find_dwo_cutu); - } - - if (dwo_cutu != NULL) - { - if (dwarf_read_debug) - { - fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n", - kind, dwo_name, hex_string (signature), - host_address_to_string (dwo_cutu)); - } - return dwo_cutu; - } - } - } - - /* We didn't find it. This could mean a dwo_id mismatch, or - someone deleted the DWO/DWP file, or the search path isn't set up - correctly to find the file. */ - - if (dwarf_read_debug) - { - fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n", - kind, dwo_name, hex_string (signature)); - } - - /* This is a warning and not a complaint because it can be caused by - pilot error (e.g., user accidentally deleting the DWO). */ - { - /* Print the name of the DWP file if we looked there, helps the user - better diagnose the problem. */ - std::string dwp_text; - - if (dwp_file != NULL) - dwp_text = string_printf (" [in DWP file %s]", - lbasename (dwp_file->name)); - - warning (_("Could not find DWO %s %s(%s)%s referenced by %s at offset %s" - " [in module %s]"), - kind, dwo_name, hex_string (signature), - dwp_text.c_str (), - this_unit->is_debug_types ? "TU" : "CU", - sect_offset_str (this_unit->sect_off), objfile_name (objfile)); - } - return NULL; -} - -/* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU. - See lookup_dwo_cutu_unit for details. */ - -static struct dwo_unit * -lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu, - const char *dwo_name, const char *comp_dir, - ULONGEST signature) -{ - return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0); -} - -/* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU. - See lookup_dwo_cutu_unit for details. */ - -static struct dwo_unit * -lookup_dwo_type_unit (struct signatured_type *this_tu, - const char *dwo_name, const char *comp_dir) -{ - return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1); -} - -/* Traversal function for queue_and_load_all_dwo_tus. */ - -static int -queue_and_load_dwo_tu (void **slot, void *info) -{ - struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot; - struct dwarf2_per_cu_data *per_cu = (struct dwarf2_per_cu_data *) info; - ULONGEST signature = dwo_unit->signature; - struct signatured_type *sig_type = - lookup_dwo_signatured_type (per_cu->cu, signature); - - if (sig_type != NULL) - { - struct dwarf2_per_cu_data *sig_cu = &sig_type->per_cu; - - /* We pass NULL for DEPENDENT_CU because we don't yet know if there's - a real dependency of PER_CU on SIG_TYPE. That is detected later - while processing PER_CU. */ - if (maybe_queue_comp_unit (NULL, sig_cu, per_cu->cu->language)) - load_full_type_unit (sig_cu); - per_cu->imported_symtabs_push (sig_cu); - } - - return 1; -} - -/* Queue all TUs contained in the DWO of PER_CU to be read in. - The DWO may have the only definition of the type, though it may not be - referenced anywhere in PER_CU. Thus we have to load *all* its TUs. - http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */ - -static void -queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *per_cu) -{ - struct dwo_unit *dwo_unit; - struct dwo_file *dwo_file; - - gdb_assert (!per_cu->is_debug_types); - gdb_assert (get_dwp_file (per_cu->dwarf2_per_objfile) == NULL); - gdb_assert (per_cu->cu != NULL); - - dwo_unit = per_cu->cu->dwo_unit; - gdb_assert (dwo_unit != NULL); - - dwo_file = dwo_unit->dwo_file; - if (dwo_file->tus != NULL) - htab_traverse_noresize (dwo_file->tus, queue_and_load_dwo_tu, per_cu); -} - -/* Read in various DIEs. */ - -/* DW_AT_abstract_origin inherits whole DIEs (not just their attributes). - Inherit only the children of the DW_AT_abstract_origin DIE not being - already referenced by DW_AT_abstract_origin from the children of the - current DIE. */ - -static void -inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu) -{ - struct die_info *child_die; - sect_offset *offsetp; - /* Parent of DIE - referenced by DW_AT_abstract_origin. */ - struct die_info *origin_die; - /* Iterator of the ORIGIN_DIE children. */ - struct die_info *origin_child_die; - struct attribute *attr; - struct dwarf2_cu *origin_cu; - struct pending **origin_previous_list_in_scope; - - attr = dwarf2_attr (die, DW_AT_abstract_origin, cu); - if (!attr) - return; - - /* Note that following die references may follow to a die in a - different cu. */ - - origin_cu = cu; - origin_die = follow_die_ref (die, attr, &origin_cu); - - /* We're inheriting ORIGIN's children into the scope we'd put DIE's - symbols in. */ - origin_previous_list_in_scope = origin_cu->list_in_scope; - origin_cu->list_in_scope = cu->list_in_scope; - - if (die->tag != origin_die->tag - && !(die->tag == DW_TAG_inlined_subroutine - && origin_die->tag == DW_TAG_subprogram)) - complaint (_("DIE %s and its abstract origin %s have different tags"), - sect_offset_str (die->sect_off), - sect_offset_str (origin_die->sect_off)); - - std::vector<sect_offset> offsets; - - for (child_die = die->child; - child_die && child_die->tag; - child_die = sibling_die (child_die)) - { - struct die_info *child_origin_die; - struct dwarf2_cu *child_origin_cu; - - /* We are trying to process concrete instance entries: - DW_TAG_call_site DIEs indeed have a DW_AT_abstract_origin tag, but - it's not relevant to our analysis here. i.e. detecting DIEs that are - present in the abstract instance but not referenced in the concrete - one. */ - if (child_die->tag == DW_TAG_call_site - || child_die->tag == DW_TAG_GNU_call_site) - continue; - - /* For each CHILD_DIE, find the corresponding child of - ORIGIN_DIE. If there is more than one layer of - DW_AT_abstract_origin, follow them all; there shouldn't be, - but GCC versions at least through 4.4 generate this (GCC PR - 40573). */ - child_origin_die = child_die; - child_origin_cu = cu; - while (1) - { - attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin, - child_origin_cu); - if (attr == NULL) - break; - child_origin_die = follow_die_ref (child_origin_die, attr, - &child_origin_cu); - } - - /* According to DWARF3 3.3.8.2 #3 new entries without their abstract - counterpart may exist. */ - if (child_origin_die != child_die) - { - if (child_die->tag != child_origin_die->tag - && !(child_die->tag == DW_TAG_inlined_subroutine - && child_origin_die->tag == DW_TAG_subprogram)) - complaint (_("Child DIE %s and its abstract origin %s have " - "different tags"), - sect_offset_str (child_die->sect_off), - sect_offset_str (child_origin_die->sect_off)); - if (child_origin_die->parent != origin_die) - complaint (_("Child DIE %s and its abstract origin %s have " - "different parents"), - sect_offset_str (child_die->sect_off), - sect_offset_str (child_origin_die->sect_off)); - else - offsets.push_back (child_origin_die->sect_off); - } - } - std::sort (offsets.begin (), offsets.end ()); - sect_offset *offsets_end = offsets.data () + offsets.size (); - for (offsetp = offsets.data () + 1; offsetp < offsets_end; offsetp++) - if (offsetp[-1] == *offsetp) - complaint (_("Multiple children of DIE %s refer " - "to DIE %s as their abstract origin"), - sect_offset_str (die->sect_off), sect_offset_str (*offsetp)); - - offsetp = offsets.data (); - origin_child_die = origin_die->child; - while (origin_child_die && origin_child_die->tag) - { - /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */ - while (offsetp < offsets_end - && *offsetp < origin_child_die->sect_off) - offsetp++; - if (offsetp >= offsets_end - || *offsetp > origin_child_die->sect_off) - { - /* Found that ORIGIN_CHILD_DIE is really not referenced. - Check whether we're already processing ORIGIN_CHILD_DIE. - This can happen with mutually referenced abstract_origins. - PR 16581. */ - if (!origin_child_die->in_process) - process_die (origin_child_die, origin_cu); - } - origin_child_die = sibling_die (origin_child_die); - } - origin_cu->list_in_scope = origin_previous_list_in_scope; - - if (cu != origin_cu) - compute_delayed_physnames (origin_cu); -} - -static void -read_func_scope (struct die_info *die, struct dwarf2_cu *cu) -{ - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - struct gdbarch *gdbarch = get_objfile_arch (objfile); - struct context_stack *newobj; - CORE_ADDR lowpc; - CORE_ADDR highpc; - struct die_info *child_die; - struct attribute *attr, *call_line, *call_file; - const char *name; - CORE_ADDR baseaddr; - struct block *block; - int inlined_func = (die->tag == DW_TAG_inlined_subroutine); - std::vector<struct symbol *> template_args; - struct template_symbol *templ_func = NULL; - - if (inlined_func) - { - /* If we do not have call site information, we can't show the - caller of this inlined function. That's too confusing, so - only use the scope for local variables. */ - call_line = dwarf2_attr (die, DW_AT_call_line, cu); - call_file = dwarf2_attr (die, DW_AT_call_file, cu); - if (call_line == NULL || call_file == NULL) - { - read_lexical_block_scope (die, cu); - return; - } - } - - baseaddr = objfile->text_section_offset (); - - name = dwarf2_name (die, cu); - - /* Ignore functions with missing or empty names. These are actually - illegal according to the DWARF standard. */ - if (name == NULL) - { - complaint (_("missing name for subprogram DIE at %s"), - sect_offset_str (die->sect_off)); - return; - } - - /* Ignore functions with missing or invalid low and high pc attributes. */ - if (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL) - <= PC_BOUNDS_INVALID) - { - attr = dwarf2_attr (die, DW_AT_external, cu); - if (!attr || !DW_UNSND (attr)) - complaint (_("cannot get low and high bounds " - "for subprogram DIE at %s"), - sect_offset_str (die->sect_off)); - return; - } - - lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr); - highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr); - - /* If we have any template arguments, then we must allocate a - different sort of symbol. */ - for (child_die = die->child; child_die; child_die = sibling_die (child_die)) - { - if (child_die->tag == DW_TAG_template_type_param - || child_die->tag == DW_TAG_template_value_param) - { - templ_func = allocate_template_symbol (objfile); - templ_func->subclass = SYMBOL_TEMPLATE; - break; - } - } - - newobj = cu->get_builder ()->push_context (0, lowpc); - newobj->name = new_symbol (die, read_type_die (die, cu), cu, - (struct symbol *) templ_func); - - if (dwarf2_flag_true_p (die, DW_AT_main_subprogram, cu)) - set_objfile_main_name (objfile, newobj->name->linkage_name (), - cu->language); - - /* If there is a location expression for DW_AT_frame_base, record - it. */ - attr = dwarf2_attr (die, DW_AT_frame_base, cu); - if (attr != nullptr) - dwarf2_symbol_mark_computed (attr, newobj->name, cu, 1); - - /* If there is a location for the static link, record it. */ - newobj->static_link = NULL; - attr = dwarf2_attr (die, DW_AT_static_link, cu); - if (attr != nullptr) - { - newobj->static_link - = XOBNEW (&objfile->objfile_obstack, struct dynamic_prop); - attr_to_dynamic_prop (attr, die, cu, newobj->static_link, - dwarf2_per_cu_addr_type (cu->per_cu)); - } - - cu->list_in_scope = cu->get_builder ()->get_local_symbols (); - - if (die->child != NULL) - { - child_die = die->child; - while (child_die && child_die->tag) - { - if (child_die->tag == DW_TAG_template_type_param - || child_die->tag == DW_TAG_template_value_param) - { - struct symbol *arg = new_symbol (child_die, NULL, cu); - - if (arg != NULL) - template_args.push_back (arg); - } - else - process_die (child_die, cu); - child_die = sibling_die (child_die); - } - } - - inherit_abstract_dies (die, cu); - - /* If we have a DW_AT_specification, we might need to import using - directives from the context of the specification DIE. See the - comment in determine_prefix. */ - if (cu->language == language_cplus - && dwarf2_attr (die, DW_AT_specification, cu)) - { - struct dwarf2_cu *spec_cu = cu; - struct die_info *spec_die = die_specification (die, &spec_cu); - - while (spec_die) - { - child_die = spec_die->child; - while (child_die && child_die->tag) - { - if (child_die->tag == DW_TAG_imported_module) - process_die (child_die, spec_cu); - child_die = sibling_die (child_die); - } - - /* In some cases, GCC generates specification DIEs that - themselves contain DW_AT_specification attributes. */ - spec_die = die_specification (spec_die, &spec_cu); - } - } - - struct context_stack cstk = cu->get_builder ()->pop_context (); - /* Make a block for the local symbols within. */ - block = cu->get_builder ()->finish_block (cstk.name, cstk.old_blocks, - cstk.static_link, lowpc, highpc); - - /* For C++, set the block's scope. */ - if ((cu->language == language_cplus - || cu->language == language_fortran - || cu->language == language_d - || cu->language == language_rust) - && cu->processing_has_namespace_info) - block_set_scope (block, determine_prefix (die, cu), - &objfile->objfile_obstack); - - /* If we have address ranges, record them. */ - dwarf2_record_block_ranges (die, block, baseaddr, cu); - - gdbarch_make_symbol_special (gdbarch, cstk.name, objfile); - - /* Attach template arguments to function. */ - if (!template_args.empty ()) - { - gdb_assert (templ_func != NULL); - - templ_func->n_template_arguments = template_args.size (); - templ_func->template_arguments - = XOBNEWVEC (&objfile->objfile_obstack, struct symbol *, - templ_func->n_template_arguments); - memcpy (templ_func->template_arguments, - template_args.data (), - (templ_func->n_template_arguments * sizeof (struct symbol *))); - - /* Make sure that the symtab is set on the new symbols. Even - though they don't appear in this symtab directly, other parts - of gdb assume that symbols do, and this is reasonably - true. */ - for (symbol *sym : template_args) - symbol_set_symtab (sym, symbol_symtab (templ_func)); - } - - /* In C++, we can have functions nested inside functions (e.g., when - a function declares a class that has methods). This means that - when we finish processing a function scope, we may need to go - back to building a containing block's symbol lists. */ - *cu->get_builder ()->get_local_symbols () = cstk.locals; - cu->get_builder ()->set_local_using_directives (cstk.local_using_directives); - - /* If we've finished processing a top-level function, subsequent - symbols go in the file symbol list. */ - if (cu->get_builder ()->outermost_context_p ()) - cu->list_in_scope = cu->get_builder ()->get_file_symbols (); -} - -/* Process all the DIES contained within a lexical block scope. Start - a new scope, process the dies, and then close the scope. */ - -static void -read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu) -{ - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - struct gdbarch *gdbarch = get_objfile_arch (objfile); - CORE_ADDR lowpc, highpc; - struct die_info *child_die; - CORE_ADDR baseaddr; - - baseaddr = objfile->text_section_offset (); - - /* Ignore blocks with missing or invalid low and high pc attributes. */ - /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges - as multiple lexical blocks? Handling children in a sane way would - be nasty. Might be easier to properly extend generic blocks to - describe ranges. */ - switch (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)) - { - case PC_BOUNDS_NOT_PRESENT: - /* DW_TAG_lexical_block has no attributes, process its children as if - there was no wrapping by that DW_TAG_lexical_block. - GCC does no longer produces such DWARF since GCC r224161. */ - for (child_die = die->child; - child_die != NULL && child_die->tag; - child_die = sibling_die (child_die)) - process_die (child_die, cu); - return; - case PC_BOUNDS_INVALID: - return; - } - lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr); - highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr); - - cu->get_builder ()->push_context (0, lowpc); - if (die->child != NULL) - { - child_die = die->child; - while (child_die && child_die->tag) - { - process_die (child_die, cu); - child_die = sibling_die (child_die); - } - } - inherit_abstract_dies (die, cu); - struct context_stack cstk = cu->get_builder ()->pop_context (); - - if (*cu->get_builder ()->get_local_symbols () != NULL - || (*cu->get_builder ()->get_local_using_directives ()) != NULL) - { - struct block *block - = cu->get_builder ()->finish_block (0, cstk.old_blocks, NULL, - cstk.start_addr, highpc); - - /* Note that recording ranges after traversing children, as we - do here, means that recording a parent's ranges entails - walking across all its children's ranges as they appear in - the address map, which is quadratic behavior. - - It would be nicer to record the parent's ranges before - traversing its children, simply overriding whatever you find - there. But since we don't even decide whether to create a - block until after we've traversed its children, that's hard - to do. */ - dwarf2_record_block_ranges (die, block, baseaddr, cu); - } - *cu->get_builder ()->get_local_symbols () = cstk.locals; - cu->get_builder ()->set_local_using_directives (cstk.local_using_directives); -} - -/* Read in DW_TAG_call_site and insert it to CU->call_site_htab. */ - -static void -read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu) -{ - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - struct gdbarch *gdbarch = get_objfile_arch (objfile); - CORE_ADDR pc, baseaddr; - struct attribute *attr; - struct call_site *call_site, call_site_local; - void **slot; - int nparams; - struct die_info *child_die; - - baseaddr = objfile->text_section_offset (); - - attr = dwarf2_attr (die, DW_AT_call_return_pc, cu); - if (attr == NULL) - { - /* This was a pre-DWARF-5 GNU extension alias - for DW_AT_call_return_pc. */ - attr = dwarf2_attr (die, DW_AT_low_pc, cu); - } - if (!attr) - { - complaint (_("missing DW_AT_call_return_pc for DW_TAG_call_site " - "DIE %s [in module %s]"), - sect_offset_str (die->sect_off), objfile_name (objfile)); - return; - } - pc = attr->value_as_address () + baseaddr; - pc = gdbarch_adjust_dwarf2_addr (gdbarch, pc); - - if (cu->call_site_htab == NULL) - cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq, - NULL, &objfile->objfile_obstack, - hashtab_obstack_allocate, NULL); - call_site_local.pc = pc; - slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT); - if (*slot != NULL) - { - complaint (_("Duplicate PC %s for DW_TAG_call_site " - "DIE %s [in module %s]"), - paddress (gdbarch, pc), sect_offset_str (die->sect_off), - objfile_name (objfile)); - return; - } - - /* Count parameters at the caller. */ - - nparams = 0; - for (child_die = die->child; child_die && child_die->tag; - child_die = sibling_die (child_die)) - { - if (child_die->tag != DW_TAG_call_site_parameter - && child_die->tag != DW_TAG_GNU_call_site_parameter) - { - complaint (_("Tag %d is not DW_TAG_call_site_parameter in " - "DW_TAG_call_site child DIE %s [in module %s]"), - child_die->tag, sect_offset_str (child_die->sect_off), - objfile_name (objfile)); - continue; - } - - nparams++; - } - - call_site - = ((struct call_site *) - obstack_alloc (&objfile->objfile_obstack, - sizeof (*call_site) - + (sizeof (*call_site->parameter) * (nparams - 1)))); - *slot = call_site; - memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter)); - call_site->pc = pc; - - if (dwarf2_flag_true_p (die, DW_AT_call_tail_call, cu) - || dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu)) - { - struct die_info *func_die; - - /* Skip also over DW_TAG_inlined_subroutine. */ - for (func_die = die->parent; - func_die && func_die->tag != DW_TAG_subprogram - && func_die->tag != DW_TAG_subroutine_type; - func_die = func_die->parent); - - /* DW_AT_call_all_calls is a superset - of DW_AT_call_all_tail_calls. */ - if (func_die - && !dwarf2_flag_true_p (func_die, DW_AT_call_all_calls, cu) - && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu) - && !dwarf2_flag_true_p (func_die, DW_AT_call_all_tail_calls, cu) - && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu)) - { - /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is - not complete. But keep CALL_SITE for look ups via call_site_htab, - both the initial caller containing the real return address PC and - the final callee containing the current PC of a chain of tail - calls do not need to have the tail call list complete. But any - function candidate for a virtual tail call frame searched via - TYPE_TAIL_CALL_LIST must have the tail call list complete to be - determined unambiguously. */ - } - else - { - struct type *func_type = NULL; - - if (func_die) - func_type = get_die_type (func_die, cu); - if (func_type != NULL) - { - gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC); - - /* Enlist this call site to the function. */ - call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type); - TYPE_TAIL_CALL_LIST (func_type) = call_site; - } - else - complaint (_("Cannot find function owning DW_TAG_call_site " - "DIE %s [in module %s]"), - sect_offset_str (die->sect_off), objfile_name (objfile)); - } - } - - attr = dwarf2_attr (die, DW_AT_call_target, cu); - if (attr == NULL) - attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu); - if (attr == NULL) - attr = dwarf2_attr (die, DW_AT_call_origin, cu); - if (attr == NULL) - { - /* This was a pre-DWARF-5 GNU extension alias for DW_AT_call_origin. */ - attr = dwarf2_attr (die, DW_AT_abstract_origin, cu); - } - SET_FIELD_DWARF_BLOCK (call_site->target, NULL); - if (!attr || (attr->form_is_block () && DW_BLOCK (attr)->size == 0)) - /* Keep NULL DWARF_BLOCK. */; - else if (attr->form_is_block ()) - { - struct dwarf2_locexpr_baton *dlbaton; - - dlbaton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton); - dlbaton->data = DW_BLOCK (attr)->data; - dlbaton->size = DW_BLOCK (attr)->size; - dlbaton->per_cu = cu->per_cu; - - SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton); - } - else if (attr->form_is_ref ()) - { - struct dwarf2_cu *target_cu = cu; - struct die_info *target_die; - - target_die = follow_die_ref (die, attr, &target_cu); - gdb_assert (target_cu->per_cu->dwarf2_per_objfile->objfile == objfile); - if (die_is_declaration (target_die, target_cu)) - { - const char *target_physname; - - /* Prefer the mangled name; otherwise compute the demangled one. */ - target_physname = dw2_linkage_name (target_die, target_cu); - if (target_physname == NULL) - target_physname = dwarf2_physname (NULL, target_die, target_cu); - if (target_physname == NULL) - complaint (_("DW_AT_call_target target DIE has invalid " - "physname, for referencing DIE %s [in module %s]"), - sect_offset_str (die->sect_off), objfile_name (objfile)); - else - SET_FIELD_PHYSNAME (call_site->target, target_physname); - } - else - { - CORE_ADDR lowpc; - - /* DW_AT_entry_pc should be preferred. */ - if (dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL) - <= PC_BOUNDS_INVALID) - complaint (_("DW_AT_call_target target DIE has invalid " - "low pc, for referencing DIE %s [in module %s]"), - sect_offset_str (die->sect_off), objfile_name (objfile)); - else - { - lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr); - SET_FIELD_PHYSADDR (call_site->target, lowpc); - } - } - } - else - complaint (_("DW_TAG_call_site DW_AT_call_target is neither " - "block nor reference, for DIE %s [in module %s]"), - sect_offset_str (die->sect_off), objfile_name (objfile)); - - call_site->per_cu = cu->per_cu; - - for (child_die = die->child; - child_die && child_die->tag; - child_die = sibling_die (child_die)) - { - struct call_site_parameter *parameter; - struct attribute *loc, *origin; - - if (child_die->tag != DW_TAG_call_site_parameter - && child_die->tag != DW_TAG_GNU_call_site_parameter) - { - /* Already printed the complaint above. */ - continue; - } - - gdb_assert (call_site->parameter_count < nparams); - parameter = &call_site->parameter[call_site->parameter_count]; - - /* DW_AT_location specifies the register number or DW_AT_abstract_origin - specifies DW_TAG_formal_parameter. Value of the data assumed for the - register is contained in DW_AT_call_value. */ - - loc = dwarf2_attr (child_die, DW_AT_location, cu); - origin = dwarf2_attr (child_die, DW_AT_call_parameter, cu); - if (origin == NULL) - { - /* This was a pre-DWARF-5 GNU extension alias - for DW_AT_call_parameter. */ - origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu); - } - if (loc == NULL && origin != NULL && origin->form_is_ref ()) - { - parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET; - - sect_offset sect_off - = (sect_offset) dwarf2_get_ref_die_offset (origin); - if (!offset_in_cu_p (&cu->header, sect_off)) - { - /* As DW_OP_GNU_parameter_ref uses CU-relative offset this - binding can be done only inside one CU. Such referenced DIE - therefore cannot be even moved to DW_TAG_partial_unit. */ - complaint (_("DW_AT_call_parameter offset is not in CU for " - "DW_TAG_call_site child DIE %s [in module %s]"), - sect_offset_str (child_die->sect_off), - objfile_name (objfile)); - continue; - } - parameter->u.param_cu_off - = (cu_offset) (sect_off - cu->header.sect_off); - } - else if (loc == NULL || origin != NULL || !loc->form_is_block ()) - { - complaint (_("No DW_FORM_block* DW_AT_location for " - "DW_TAG_call_site child DIE %s [in module %s]"), - sect_offset_str (child_die->sect_off), objfile_name (objfile)); - continue; - } - else - { - parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg - (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]); - if (parameter->u.dwarf_reg != -1) - parameter->kind = CALL_SITE_PARAMETER_DWARF_REG; - else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data, - &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size], - ¶meter->u.fb_offset)) - parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET; - else - { - complaint (_("Only single DW_OP_reg or DW_OP_fbreg is supported " - "for DW_FORM_block* DW_AT_location is supported for " - "DW_TAG_call_site child DIE %s " - "[in module %s]"), - sect_offset_str (child_die->sect_off), - objfile_name (objfile)); - continue; - } - } - - attr = dwarf2_attr (child_die, DW_AT_call_value, cu); - if (attr == NULL) - attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu); - if (attr == NULL || !attr->form_is_block ()) - { - complaint (_("No DW_FORM_block* DW_AT_call_value for " - "DW_TAG_call_site child DIE %s [in module %s]"), - sect_offset_str (child_die->sect_off), - objfile_name (objfile)); - continue; - } - parameter->value = DW_BLOCK (attr)->data; - parameter->value_size = DW_BLOCK (attr)->size; - - /* Parameters are not pre-cleared by memset above. */ - parameter->data_value = NULL; - parameter->data_value_size = 0; - call_site->parameter_count++; - - attr = dwarf2_attr (child_die, DW_AT_call_data_value, cu); - if (attr == NULL) - attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu); - if (attr != nullptr) - { - if (!attr->form_is_block ()) - complaint (_("No DW_FORM_block* DW_AT_call_data_value for " - "DW_TAG_call_site child DIE %s [in module %s]"), - sect_offset_str (child_die->sect_off), - objfile_name (objfile)); - else - { - parameter->data_value = DW_BLOCK (attr)->data; - parameter->data_value_size = DW_BLOCK (attr)->size; - } - } - } -} - -/* Helper function for read_variable. If DIE represents a virtual - table, then return the type of the concrete object that is - associated with the virtual table. Otherwise, return NULL. */ - -static struct type * -rust_containing_type (struct die_info *die, struct dwarf2_cu *cu) -{ - struct attribute *attr = dwarf2_attr (die, DW_AT_type, cu); - if (attr == NULL) - return NULL; - - /* Find the type DIE. */ - struct die_info *type_die = NULL; - struct dwarf2_cu *type_cu = cu; - - if (attr->form_is_ref ()) - type_die = follow_die_ref (die, attr, &type_cu); - if (type_die == NULL) - return NULL; - - if (dwarf2_attr (type_die, DW_AT_containing_type, type_cu) == NULL) - return NULL; - return die_containing_type (type_die, type_cu); -} - -/* Read a variable (DW_TAG_variable) DIE and create a new symbol. */ - -static void -read_variable (struct die_info *die, struct dwarf2_cu *cu) -{ - struct rust_vtable_symbol *storage = NULL; - - if (cu->language == language_rust) - { - struct type *containing_type = rust_containing_type (die, cu); - - if (containing_type != NULL) - { - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - - storage = new (&objfile->objfile_obstack) rust_vtable_symbol (); - initialize_objfile_symbol (storage); - storage->concrete_type = containing_type; - storage->subclass = SYMBOL_RUST_VTABLE; - } - } - - struct symbol *res = new_symbol (die, NULL, cu, storage); - struct attribute *abstract_origin - = dwarf2_attr (die, DW_AT_abstract_origin, cu); - struct attribute *loc = dwarf2_attr (die, DW_AT_location, cu); - if (res == NULL && loc && abstract_origin) - { - /* We have a variable without a name, but with a location and an abstract - origin. This may be a concrete instance of an abstract variable - referenced from an DW_OP_GNU_variable_value, so save it to find it back - later. */ - struct dwarf2_cu *origin_cu = cu; - struct die_info *origin_die - = follow_die_ref (die, abstract_origin, &origin_cu); - dwarf2_per_objfile *dpo = cu->per_cu->dwarf2_per_objfile; - dpo->abstract_to_concrete[origin_die->sect_off].push_back (die->sect_off); - } -} - -/* Call CALLBACK from DW_AT_ranges attribute value OFFSET - reading .debug_rnglists. - Callback's type should be: - void (CORE_ADDR range_beginning, CORE_ADDR range_end) - Return true if the attributes are present and valid, otherwise, - return false. */ - -template <typename Callback> -static bool -dwarf2_rnglists_process (unsigned offset, struct dwarf2_cu *cu, - Callback &&callback) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - struct objfile *objfile = dwarf2_per_objfile->objfile; - bfd *obfd = objfile->obfd; - /* Base address selection entry. */ - CORE_ADDR base; - int found_base; - const gdb_byte *buffer; - CORE_ADDR baseaddr; - bool overflow = false; - - found_base = cu->base_known; - base = cu->base_address; - - dwarf2_per_objfile->rnglists.read (objfile); - if (offset >= dwarf2_per_objfile->rnglists.size) - { - complaint (_("Offset %d out of bounds for DW_AT_ranges attribute"), - offset); - return false; - } - buffer = dwarf2_per_objfile->rnglists.buffer + offset; - - baseaddr = objfile->text_section_offset (); - - while (1) - { - /* Initialize it due to a false compiler warning. */ - CORE_ADDR range_beginning = 0, range_end = 0; - const gdb_byte *buf_end = (dwarf2_per_objfile->rnglists.buffer - + dwarf2_per_objfile->rnglists.size); - unsigned int bytes_read; - - if (buffer == buf_end) - { - overflow = true; - break; - } - const auto rlet = static_cast<enum dwarf_range_list_entry>(*buffer++); - switch (rlet) - { - case DW_RLE_end_of_list: - break; - case DW_RLE_base_address: - if (buffer + cu->header.addr_size > buf_end) - { - overflow = true; - break; - } - base = read_address (obfd, buffer, cu, &bytes_read); - found_base = 1; - buffer += bytes_read; - break; - case DW_RLE_start_length: - if (buffer + cu->header.addr_size > buf_end) - { - overflow = true; - break; - } - range_beginning = read_address (obfd, buffer, cu, &bytes_read); - buffer += bytes_read; - range_end = (range_beginning - + read_unsigned_leb128 (obfd, buffer, &bytes_read)); - buffer += bytes_read; - if (buffer > buf_end) - { - overflow = true; - break; - } - break; - case DW_RLE_offset_pair: - range_beginning = read_unsigned_leb128 (obfd, buffer, &bytes_read); - buffer += bytes_read; - if (buffer > buf_end) - { - overflow = true; - break; - } - range_end = read_unsigned_leb128 (obfd, buffer, &bytes_read); - buffer += bytes_read; - if (buffer > buf_end) - { - overflow = true; - break; - } - break; - case DW_RLE_start_end: - if (buffer + 2 * cu->header.addr_size > buf_end) - { - overflow = true; - break; - } - range_beginning = read_address (obfd, buffer, cu, &bytes_read); - buffer += bytes_read; - range_end = read_address (obfd, buffer, cu, &bytes_read); - buffer += bytes_read; - break; - default: - complaint (_("Invalid .debug_rnglists data (no base address)")); - return false; - } - if (rlet == DW_RLE_end_of_list || overflow) - break; - if (rlet == DW_RLE_base_address) - continue; - - if (!found_base) - { - /* We have no valid base address for the ranges - data. */ - complaint (_("Invalid .debug_rnglists data (no base address)")); - return false; - } - - if (range_beginning > range_end) - { - /* Inverted range entries are invalid. */ - complaint (_("Invalid .debug_rnglists data (inverted range)")); - return false; - } - - /* Empty range entries have no effect. */ - if (range_beginning == range_end) - continue; - - range_beginning += base; - range_end += base; - - /* A not-uncommon case of bad debug info. - Don't pollute the addrmap with bad data. */ - if (range_beginning + baseaddr == 0 - && !dwarf2_per_objfile->has_section_at_zero) - { - complaint (_(".debug_rnglists entry has start address of zero" - " [in module %s]"), objfile_name (objfile)); - continue; - } - - callback (range_beginning, range_end); - } - - if (overflow) - { - complaint (_("Offset %d is not terminated " - "for DW_AT_ranges attribute"), - offset); - return false; - } - - return true; -} - -/* Call CALLBACK from DW_AT_ranges attribute value OFFSET reading .debug_ranges. - Callback's type should be: - void (CORE_ADDR range_beginning, CORE_ADDR range_end) - Return 1 if the attributes are present and valid, otherwise, return 0. */ - -template <typename Callback> -static int -dwarf2_ranges_process (unsigned offset, struct dwarf2_cu *cu, - Callback &&callback) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - struct objfile *objfile = dwarf2_per_objfile->objfile; - struct comp_unit_head *cu_header = &cu->header; - bfd *obfd = objfile->obfd; - unsigned int addr_size = cu_header->addr_size; - CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1)); - /* Base address selection entry. */ - CORE_ADDR base; - int found_base; - unsigned int dummy; - const gdb_byte *buffer; - CORE_ADDR baseaddr; - - if (cu_header->version >= 5) - return dwarf2_rnglists_process (offset, cu, callback); - - found_base = cu->base_known; - base = cu->base_address; - - dwarf2_per_objfile->ranges.read (objfile); - if (offset >= dwarf2_per_objfile->ranges.size) - { - complaint (_("Offset %d out of bounds for DW_AT_ranges attribute"), - offset); - return 0; - } - buffer = dwarf2_per_objfile->ranges.buffer + offset; - - baseaddr = objfile->text_section_offset (); - - while (1) - { - CORE_ADDR range_beginning, range_end; - - range_beginning = read_address (obfd, buffer, cu, &dummy); - buffer += addr_size; - range_end = read_address (obfd, buffer, cu, &dummy); - buffer += addr_size; - offset += 2 * addr_size; - - /* An end of list marker is a pair of zero addresses. */ - if (range_beginning == 0 && range_end == 0) - /* Found the end of list entry. */ - break; - - /* Each base address selection entry is a pair of 2 values. - The first is the largest possible address, the second is - the base address. Check for a base address here. */ - if ((range_beginning & mask) == mask) - { - /* If we found the largest possible address, then we already - have the base address in range_end. */ - base = range_end; - found_base = 1; - continue; - } - - if (!found_base) - { - /* We have no valid base address for the ranges - data. */ - complaint (_("Invalid .debug_ranges data (no base address)")); - return 0; - } - - if (range_beginning > range_end) - { - /* Inverted range entries are invalid. */ - complaint (_("Invalid .debug_ranges data (inverted range)")); - return 0; - } - - /* Empty range entries have no effect. */ - if (range_beginning == range_end) - continue; - - range_beginning += base; - range_end += base; - - /* A not-uncommon case of bad debug info. - Don't pollute the addrmap with bad data. */ - if (range_beginning + baseaddr == 0 - && !dwarf2_per_objfile->has_section_at_zero) - { - complaint (_(".debug_ranges entry has start address of zero" - " [in module %s]"), objfile_name (objfile)); - continue; - } - - callback (range_beginning, range_end); - } - - return 1; -} - -/* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET. - Return 1 if the attributes are present and valid, otherwise, return 0. - If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */ - -static int -dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return, - CORE_ADDR *high_return, struct dwarf2_cu *cu, - dwarf2_psymtab *ranges_pst) -{ - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - struct gdbarch *gdbarch = get_objfile_arch (objfile); - const CORE_ADDR baseaddr = objfile->text_section_offset (); - int low_set = 0; - CORE_ADDR low = 0; - CORE_ADDR high = 0; - int retval; - - retval = dwarf2_ranges_process (offset, cu, - [&] (CORE_ADDR range_beginning, CORE_ADDR range_end) - { - if (ranges_pst != NULL) - { - CORE_ADDR lowpc; - CORE_ADDR highpc; - - lowpc = (gdbarch_adjust_dwarf2_addr (gdbarch, - range_beginning + baseaddr) - - baseaddr); - highpc = (gdbarch_adjust_dwarf2_addr (gdbarch, - range_end + baseaddr) - - baseaddr); - addrmap_set_empty (objfile->partial_symtabs->psymtabs_addrmap, - lowpc, highpc - 1, ranges_pst); - } - - /* FIXME: This is recording everything as a low-high - segment of consecutive addresses. We should have a - data structure for discontiguous block ranges - instead. */ - if (! low_set) - { - low = range_beginning; - high = range_end; - low_set = 1; - } - else - { - if (range_beginning < low) - low = range_beginning; - if (range_end > high) - high = range_end; - } - }); - if (!retval) - return 0; - - if (! low_set) - /* If the first entry is an end-of-list marker, the range - describes an empty scope, i.e. no instructions. */ - return 0; - - if (low_return) - *low_return = low; - if (high_return) - *high_return = high; - return 1; -} - -/* Get low and high pc attributes from a die. See enum pc_bounds_kind - definition for the return value. *LOWPC and *HIGHPC are set iff - neither PC_BOUNDS_NOT_PRESENT nor PC_BOUNDS_INVALID are returned. */ - -static enum pc_bounds_kind -dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc, - CORE_ADDR *highpc, struct dwarf2_cu *cu, - dwarf2_psymtab *pst) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - struct attribute *attr; - struct attribute *attr_high; - CORE_ADDR low = 0; - CORE_ADDR high = 0; - enum pc_bounds_kind ret; - - attr_high = dwarf2_attr (die, DW_AT_high_pc, cu); - if (attr_high) - { - attr = dwarf2_attr (die, DW_AT_low_pc, cu); - if (attr != nullptr) - { - low = attr->value_as_address (); - high = attr_high->value_as_address (); - if (cu->header.version >= 4 && attr_high->form_is_constant ()) - high += low; - } - else - /* Found high w/o low attribute. */ - return PC_BOUNDS_INVALID; - - /* Found consecutive range of addresses. */ - ret = PC_BOUNDS_HIGH_LOW; - } - else - { - attr = dwarf2_attr (die, DW_AT_ranges, cu); - if (attr != NULL) - { - /* DW_AT_rnglists_base does not apply to DIEs from the DWO skeleton. - We take advantage of the fact that DW_AT_ranges does not appear - in DW_TAG_compile_unit of DWO files. */ - int need_ranges_base = die->tag != DW_TAG_compile_unit; - unsigned int ranges_offset = (DW_UNSND (attr) - + (need_ranges_base - ? cu->ranges_base - : 0)); - - /* Value of the DW_AT_ranges attribute is the offset in the - .debug_ranges section. */ - if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst)) - return PC_BOUNDS_INVALID; - /* Found discontinuous range of addresses. */ - ret = PC_BOUNDS_RANGES; - } - else - return PC_BOUNDS_NOT_PRESENT; - } - - /* partial_die_info::read has also the strict LOW < HIGH requirement. */ - if (high <= low) - return PC_BOUNDS_INVALID; - - /* When using the GNU linker, .gnu.linkonce. sections are used to - eliminate duplicate copies of functions and vtables and such. - The linker will arbitrarily choose one and discard the others. - The AT_*_pc values for such functions refer to local labels in - these sections. If the section from that file was discarded, the - labels are not in the output, so the relocs get a value of 0. - If this is a discarded function, mark the pc bounds as invalid, - so that GDB will ignore it. */ - if (low == 0 && !dwarf2_per_objfile->has_section_at_zero) - return PC_BOUNDS_INVALID; - - *lowpc = low; - if (highpc) - *highpc = high; - return ret; -} - -/* Assuming that DIE represents a subprogram DIE or a lexical block, get - its low and high PC addresses. Do nothing if these addresses could not - be determined. Otherwise, set LOWPC to the low address if it is smaller, - and HIGHPC to the high address if greater than HIGHPC. */ - -static void -dwarf2_get_subprogram_pc_bounds (struct die_info *die, - CORE_ADDR *lowpc, CORE_ADDR *highpc, - struct dwarf2_cu *cu) -{ - CORE_ADDR low, high; - struct die_info *child = die->child; - - if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL) >= PC_BOUNDS_RANGES) - { - *lowpc = std::min (*lowpc, low); - *highpc = std::max (*highpc, high); - } - - /* If the language does not allow nested subprograms (either inside - subprograms or lexical blocks), we're done. */ - if (cu->language != language_ada) - return; - - /* Check all the children of the given DIE. If it contains nested - subprograms, then check their pc bounds. Likewise, we need to - check lexical blocks as well, as they may also contain subprogram - definitions. */ - while (child && child->tag) - { - if (child->tag == DW_TAG_subprogram - || child->tag == DW_TAG_lexical_block) - dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu); - child = sibling_die (child); - } -} - -/* Get the low and high pc's represented by the scope DIE, and store - them in *LOWPC and *HIGHPC. If the correct values can't be - determined, set *LOWPC to -1 and *HIGHPC to 0. */ - -static void -get_scope_pc_bounds (struct die_info *die, - CORE_ADDR *lowpc, CORE_ADDR *highpc, - struct dwarf2_cu *cu) -{ - CORE_ADDR best_low = (CORE_ADDR) -1; - CORE_ADDR best_high = (CORE_ADDR) 0; - CORE_ADDR current_low, current_high; - - if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL) - >= PC_BOUNDS_RANGES) - { - best_low = current_low; - best_high = current_high; - } - else - { - struct die_info *child = die->child; - - while (child && child->tag) - { - switch (child->tag) { - case DW_TAG_subprogram: - dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu); - break; - case DW_TAG_namespace: - case DW_TAG_module: - /* FIXME: carlton/2004-01-16: Should we do this for - DW_TAG_class_type/DW_TAG_structure_type, too? I think - that current GCC's always emit the DIEs corresponding - to definitions of methods of classes as children of a - DW_TAG_compile_unit or DW_TAG_namespace (as opposed to - the DIEs giving the declarations, which could be - anywhere). But I don't see any reason why the - standards says that they have to be there. */ - get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu); - - if (current_low != ((CORE_ADDR) -1)) - { - best_low = std::min (best_low, current_low); - best_high = std::max (best_high, current_high); - } - break; - default: - /* Ignore. */ - break; - } - - child = sibling_die (child); - } - } - - *lowpc = best_low; - *highpc = best_high; -} - -/* Record the address ranges for BLOCK, offset by BASEADDR, as given - in DIE. */ - -static void -dwarf2_record_block_ranges (struct die_info *die, struct block *block, - CORE_ADDR baseaddr, struct dwarf2_cu *cu) -{ - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - struct gdbarch *gdbarch = get_objfile_arch (objfile); - struct attribute *attr; - struct attribute *attr_high; - - attr_high = dwarf2_attr (die, DW_AT_high_pc, cu); - if (attr_high) - { - attr = dwarf2_attr (die, DW_AT_low_pc, cu); - if (attr != nullptr) - { - CORE_ADDR low = attr->value_as_address (); - CORE_ADDR high = attr_high->value_as_address (); - - if (cu->header.version >= 4 && attr_high->form_is_constant ()) - high += low; - - low = gdbarch_adjust_dwarf2_addr (gdbarch, low + baseaddr); - high = gdbarch_adjust_dwarf2_addr (gdbarch, high + baseaddr); - cu->get_builder ()->record_block_range (block, low, high - 1); - } - } - - attr = dwarf2_attr (die, DW_AT_ranges, cu); - if (attr != nullptr) - { - /* DW_AT_rnglists_base does not apply to DIEs from the DWO skeleton. - We take advantage of the fact that DW_AT_ranges does not appear - in DW_TAG_compile_unit of DWO files. */ - int need_ranges_base = die->tag != DW_TAG_compile_unit; - - /* The value of the DW_AT_ranges attribute is the offset of the - address range list in the .debug_ranges section. */ - unsigned long offset = (DW_UNSND (attr) - + (need_ranges_base ? cu->ranges_base : 0)); - - std::vector<blockrange> blockvec; - dwarf2_ranges_process (offset, cu, - [&] (CORE_ADDR start, CORE_ADDR end) - { - start += baseaddr; - end += baseaddr; - start = gdbarch_adjust_dwarf2_addr (gdbarch, start); - end = gdbarch_adjust_dwarf2_addr (gdbarch, end); - cu->get_builder ()->record_block_range (block, start, end - 1); - blockvec.emplace_back (start, end); - }); - - BLOCK_RANGES(block) = make_blockranges (objfile, blockvec); - } -} - -/* Check whether the producer field indicates either of GCC < 4.6, or the - Intel C/C++ compiler, and cache the result in CU. */ - -static void -check_producer (struct dwarf2_cu *cu) -{ - int major, minor; - - if (cu->producer == NULL) - { - /* For unknown compilers expect their behavior is DWARF version - compliant. - - GCC started to support .debug_types sections by -gdwarf-4 since - gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer - for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4 - combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility - interpreted incorrectly by GDB now - GCC PR debug/48229. */ - } - else if (producer_is_gcc (cu->producer, &major, &minor)) - { - cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6); - cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3); - } - else if (producer_is_icc (cu->producer, &major, &minor)) - { - cu->producer_is_icc = true; - cu->producer_is_icc_lt_14 = major < 14; - } - else if (startswith (cu->producer, "CodeWarrior S12/L-ISA")) - cu->producer_is_codewarrior = true; - else - { - /* For other non-GCC compilers, expect their behavior is DWARF version - compliant. */ - } - - cu->checked_producer = true; -} - -/* Check for GCC PR debug/45124 fix which is not present in any G++ version up - to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed - during 4.6.0 experimental. */ - -static bool -producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu) -{ - if (!cu->checked_producer) - check_producer (cu); - - return cu->producer_is_gxx_lt_4_6; -} - - -/* Codewarrior (at least as of version 5.0.40) generates dwarf line information - with incorrect is_stmt attributes. */ - -static bool -producer_is_codewarrior (struct dwarf2_cu *cu) -{ - if (!cu->checked_producer) - check_producer (cu); - - return cu->producer_is_codewarrior; -} - -/* Return the default accessibility type if it is not overridden by - DW_AT_accessibility. */ - -static enum dwarf_access_attribute -dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu) -{ - if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu)) - { - /* The default DWARF 2 accessibility for members is public, the default - accessibility for inheritance is private. */ - - if (die->tag != DW_TAG_inheritance) - return DW_ACCESS_public; - else - return DW_ACCESS_private; - } - else - { - /* DWARF 3+ defines the default accessibility a different way. The same - rules apply now for DW_TAG_inheritance as for the members and it only - depends on the container kind. */ - - if (die->parent->tag == DW_TAG_class_type) - return DW_ACCESS_private; - else - return DW_ACCESS_public; - } -} - -/* Look for DW_AT_data_member_location. Set *OFFSET to the byte - offset. If the attribute was not found return 0, otherwise return - 1. If it was found but could not properly be handled, set *OFFSET - to 0. */ - -static int -handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu, - LONGEST *offset) -{ - struct attribute *attr; - - attr = dwarf2_attr (die, DW_AT_data_member_location, cu); - if (attr != NULL) - { - *offset = 0; - - /* Note that we do not check for a section offset first here. - This is because DW_AT_data_member_location is new in DWARF 4, - so if we see it, we can assume that a constant form is really - a constant and not a section offset. */ - if (attr->form_is_constant ()) - *offset = dwarf2_get_attr_constant_value (attr, 0); - else if (attr->form_is_section_offset ()) - dwarf2_complex_location_expr_complaint (); - else if (attr->form_is_block ()) - *offset = decode_locdesc (DW_BLOCK (attr), cu); - else - dwarf2_complex_location_expr_complaint (); - - return 1; - } - - return 0; -} - -/* Add an aggregate field to the field list. */ - -static void -dwarf2_add_field (struct field_info *fip, struct die_info *die, - struct dwarf2_cu *cu) -{ - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - struct gdbarch *gdbarch = get_objfile_arch (objfile); - struct nextfield *new_field; - struct attribute *attr; - struct field *fp; - const char *fieldname = ""; - - if (die->tag == DW_TAG_inheritance) - { - fip->baseclasses.emplace_back (); - new_field = &fip->baseclasses.back (); - } - else - { - fip->fields.emplace_back (); - new_field = &fip->fields.back (); - } - - fip->nfields++; - - attr = dwarf2_attr (die, DW_AT_accessibility, cu); - if (attr != nullptr) - new_field->accessibility = DW_UNSND (attr); - else - new_field->accessibility = dwarf2_default_access_attribute (die, cu); - if (new_field->accessibility != DW_ACCESS_public) - fip->non_public_fields = 1; - - attr = dwarf2_attr (die, DW_AT_virtuality, cu); - if (attr != nullptr) - new_field->virtuality = DW_UNSND (attr); - else - new_field->virtuality = DW_VIRTUALITY_none; - - fp = &new_field->field; - - if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu)) - { - LONGEST offset; - - /* Data member other than a C++ static data member. */ - - /* Get type of field. */ - fp->type = die_type (die, cu); - - SET_FIELD_BITPOS (*fp, 0); - - /* Get bit size of field (zero if none). */ - attr = dwarf2_attr (die, DW_AT_bit_size, cu); - if (attr != nullptr) - { - FIELD_BITSIZE (*fp) = DW_UNSND (attr); - } - else - { - FIELD_BITSIZE (*fp) = 0; - } - - /* Get bit offset of field. */ - if (handle_data_member_location (die, cu, &offset)) - SET_FIELD_BITPOS (*fp, offset * bits_per_byte); - attr = dwarf2_attr (die, DW_AT_bit_offset, cu); - if (attr != nullptr) - { - if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) - { - /* For big endian bits, the DW_AT_bit_offset gives the - additional bit offset from the MSB of the containing - anonymous object to the MSB of the field. We don't - have to do anything special since we don't need to - know the size of the anonymous object. */ - SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr)); - } - else - { - /* For little endian bits, compute the bit offset to the - MSB of the anonymous object, subtract off the number of - bits from the MSB of the field to the MSB of the - object, and then subtract off the number of bits of - the field itself. The result is the bit offset of - the LSB of the field. */ - int anonymous_size; - int bit_offset = DW_UNSND (attr); - - attr = dwarf2_attr (die, DW_AT_byte_size, cu); - if (attr != nullptr) - { - /* The size of the anonymous object containing - the bit field is explicit, so use the - indicated size (in bytes). */ - anonymous_size = DW_UNSND (attr); - } - else - { - /* The size of the anonymous object containing - the bit field must be inferred from the type - attribute of the data member containing the - bit field. */ - anonymous_size = TYPE_LENGTH (fp->type); - } - SET_FIELD_BITPOS (*fp, - (FIELD_BITPOS (*fp) - + anonymous_size * bits_per_byte - - bit_offset - FIELD_BITSIZE (*fp))); - } - } - attr = dwarf2_attr (die, DW_AT_data_bit_offset, cu); - if (attr != NULL) - SET_FIELD_BITPOS (*fp, (FIELD_BITPOS (*fp) - + dwarf2_get_attr_constant_value (attr, 0))); - - /* Get name of field. */ - fieldname = dwarf2_name (die, cu); - if (fieldname == NULL) - fieldname = ""; - - /* The name is already allocated along with this objfile, so we don't - need to duplicate it for the type. */ - fp->name = fieldname; - - /* Change accessibility for artificial fields (e.g. virtual table - pointer or virtual base class pointer) to private. */ - if (dwarf2_attr (die, DW_AT_artificial, cu)) - { - FIELD_ARTIFICIAL (*fp) = 1; - new_field->accessibility = DW_ACCESS_private; - fip->non_public_fields = 1; - } - } - else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable) - { - /* C++ static member. */ - - /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that - is a declaration, but all versions of G++ as of this writing - (so through at least 3.2.1) incorrectly generate - DW_TAG_variable tags. */ - - const char *physname; - - /* Get name of field. */ - fieldname = dwarf2_name (die, cu); - if (fieldname == NULL) - return; - - attr = dwarf2_attr (die, DW_AT_const_value, cu); - if (attr - /* Only create a symbol if this is an external value. - new_symbol checks this and puts the value in the global symbol - table, which we want. If it is not external, new_symbol - will try to put the value in cu->list_in_scope which is wrong. */ - && dwarf2_flag_true_p (die, DW_AT_external, cu)) - { - /* A static const member, not much different than an enum as far as - we're concerned, except that we can support more types. */ - new_symbol (die, NULL, cu); - } - - /* Get physical name. */ - physname = dwarf2_physname (fieldname, die, cu); - - /* The name is already allocated along with this objfile, so we don't - need to duplicate it for the type. */ - SET_FIELD_PHYSNAME (*fp, physname ? physname : ""); - FIELD_TYPE (*fp) = die_type (die, cu); - FIELD_NAME (*fp) = fieldname; - } - else if (die->tag == DW_TAG_inheritance) - { - LONGEST offset; - - /* C++ base class field. */ - if (handle_data_member_location (die, cu, &offset)) - SET_FIELD_BITPOS (*fp, offset * bits_per_byte); - FIELD_BITSIZE (*fp) = 0; - FIELD_TYPE (*fp) = die_type (die, cu); - FIELD_NAME (*fp) = TYPE_NAME (fp->type); - } - else if (die->tag == DW_TAG_variant_part) - { - /* process_structure_scope will treat this DIE as a union. */ - process_structure_scope (die, cu); - - /* The variant part is relative to the start of the enclosing - structure. */ - SET_FIELD_BITPOS (*fp, 0); - fp->type = get_die_type (die, cu); - fp->artificial = 1; - fp->name = "<<variant>>"; - - /* Normally a DW_TAG_variant_part won't have a size, but our - representation requires one, so set it to the maximum of the - child sizes, being sure to account for the offset at which - each child is seen. */ - if (TYPE_LENGTH (fp->type) == 0) - { - unsigned max = 0; - for (int i = 0; i < TYPE_NFIELDS (fp->type); ++i) - { - unsigned len = ((TYPE_FIELD_BITPOS (fp->type, i) + 7) / 8 - + TYPE_LENGTH (TYPE_FIELD_TYPE (fp->type, i))); - if (len > max) - max = len; - } - TYPE_LENGTH (fp->type) = max; - } - } - else - gdb_assert_not_reached ("missing case in dwarf2_add_field"); -} - -/* Can the type given by DIE define another type? */ - -static bool -type_can_define_types (const struct die_info *die) -{ - switch (die->tag) - { - case DW_TAG_typedef: - case DW_TAG_class_type: - case DW_TAG_structure_type: - case DW_TAG_union_type: - case DW_TAG_enumeration_type: - return true; - - default: - return false; - } -} - -/* Add a type definition defined in the scope of the FIP's class. */ - -static void -dwarf2_add_type_defn (struct field_info *fip, struct die_info *die, - struct dwarf2_cu *cu) -{ - struct decl_field fp; - memset (&fp, 0, sizeof (fp)); - - gdb_assert (type_can_define_types (die)); - - /* Get name of field. NULL is okay here, meaning an anonymous type. */ - fp.name = dwarf2_name (die, cu); - fp.type = read_type_die (die, cu); - - /* Save accessibility. */ - enum dwarf_access_attribute accessibility; - struct attribute *attr = dwarf2_attr (die, DW_AT_accessibility, cu); - if (attr != NULL) - accessibility = (enum dwarf_access_attribute) DW_UNSND (attr); - else - accessibility = dwarf2_default_access_attribute (die, cu); - switch (accessibility) - { - case DW_ACCESS_public: - /* The assumed value if neither private nor protected. */ - break; - case DW_ACCESS_private: - fp.is_private = 1; - break; - case DW_ACCESS_protected: - fp.is_protected = 1; - break; - default: - complaint (_("Unhandled DW_AT_accessibility value (%x)"), accessibility); - } - - if (die->tag == DW_TAG_typedef) - fip->typedef_field_list.push_back (fp); - else - fip->nested_types_list.push_back (fp); -} - -/* Create the vector of fields, and attach it to the type. */ - -static void -dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type, - struct dwarf2_cu *cu) -{ - int nfields = fip->nfields; - - /* Record the field count, allocate space for the array of fields, - and create blank accessibility bitfields if necessary. */ - TYPE_NFIELDS (type) = nfields; - TYPE_FIELDS (type) = (struct field *) - TYPE_ZALLOC (type, sizeof (struct field) * nfields); - - if (fip->non_public_fields && cu->language != language_ada) - { - ALLOCATE_CPLUS_STRUCT_TYPE (type); - - TYPE_FIELD_PRIVATE_BITS (type) = - (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields)); - B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields); - - TYPE_FIELD_PROTECTED_BITS (type) = - (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields)); - B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields); - - TYPE_FIELD_IGNORE_BITS (type) = - (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields)); - B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields); - } - - /* If the type has baseclasses, allocate and clear a bit vector for - TYPE_FIELD_VIRTUAL_BITS. */ - if (!fip->baseclasses.empty () && cu->language != language_ada) - { - int num_bytes = B_BYTES (fip->baseclasses.size ()); - unsigned char *pointer; - - ALLOCATE_CPLUS_STRUCT_TYPE (type); - pointer = (unsigned char *) TYPE_ALLOC (type, num_bytes); - TYPE_FIELD_VIRTUAL_BITS (type) = pointer; - B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->baseclasses.size ()); - TYPE_N_BASECLASSES (type) = fip->baseclasses.size (); - } - - if (TYPE_FLAG_DISCRIMINATED_UNION (type)) - { - struct discriminant_info *di = alloc_discriminant_info (type, -1, -1); - - for (int index = 0; index < nfields; ++index) - { - struct nextfield &field = fip->fields[index]; - - if (field.variant.is_discriminant) - di->discriminant_index = index; - else if (field.variant.default_branch) - di->default_index = index; - else - di->discriminants[index] = field.variant.discriminant_value; - } - } - - /* Copy the saved-up fields into the field vector. */ - for (int i = 0; i < nfields; ++i) - { - struct nextfield &field - = ((i < fip->baseclasses.size ()) ? fip->baseclasses[i] - : fip->fields[i - fip->baseclasses.size ()]); - - TYPE_FIELD (type, i) = field.field; - switch (field.accessibility) - { - case DW_ACCESS_private: - if (cu->language != language_ada) - SET_TYPE_FIELD_PRIVATE (type, i); - break; - - case DW_ACCESS_protected: - if (cu->language != language_ada) - SET_TYPE_FIELD_PROTECTED (type, i); - break; - - case DW_ACCESS_public: - break; - - default: - /* Unknown accessibility. Complain and treat it as public. */ - { - complaint (_("unsupported accessibility %d"), - field.accessibility); - } - break; - } - if (i < fip->baseclasses.size ()) - { - switch (field.virtuality) - { - case DW_VIRTUALITY_virtual: - case DW_VIRTUALITY_pure_virtual: - if (cu->language == language_ada) - error (_("unexpected virtuality in component of Ada type")); - SET_TYPE_FIELD_VIRTUAL (type, i); - break; - } - } - } -} - -/* Return true if this member function is a constructor, false - otherwise. */ - -static int -dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu) -{ - const char *fieldname; - const char *type_name; - int len; - - if (die->parent == NULL) - return 0; - - if (die->parent->tag != DW_TAG_structure_type - && die->parent->tag != DW_TAG_union_type - && die->parent->tag != DW_TAG_class_type) - return 0; - - fieldname = dwarf2_name (die, cu); - type_name = dwarf2_name (die->parent, cu); - if (fieldname == NULL || type_name == NULL) - return 0; - - len = strlen (fieldname); - return (strncmp (fieldname, type_name, len) == 0 - && (type_name[len] == '\0' || type_name[len] == '<')); -} - -/* Check if the given VALUE is a recognized enum - dwarf_defaulted_attribute constant according to DWARF5 spec, - Table 7.24. */ - -static bool -is_valid_DW_AT_defaulted (ULONGEST value) -{ - switch (value) - { - case DW_DEFAULTED_no: - case DW_DEFAULTED_in_class: - case DW_DEFAULTED_out_of_class: - return true; - } - - complaint (_("unrecognized DW_AT_defaulted value (%s)"), pulongest (value)); - return false; -} - -/* Add a member function to the proper fieldlist. */ - -static void -dwarf2_add_member_fn (struct field_info *fip, struct die_info *die, - struct type *type, struct dwarf2_cu *cu) -{ - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - struct attribute *attr; - int i; - struct fnfieldlist *flp = nullptr; - struct fn_field *fnp; - const char *fieldname; - struct type *this_type; - enum dwarf_access_attribute accessibility; - - if (cu->language == language_ada) - error (_("unexpected member function in Ada type")); - - /* Get name of member function. */ - fieldname = dwarf2_name (die, cu); - if (fieldname == NULL) - return; - - /* Look up member function name in fieldlist. */ - for (i = 0; i < fip->fnfieldlists.size (); i++) - { - if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0) - { - flp = &fip->fnfieldlists[i]; - break; - } - } - - /* Create a new fnfieldlist if necessary. */ - if (flp == nullptr) - { - fip->fnfieldlists.emplace_back (); - flp = &fip->fnfieldlists.back (); - flp->name = fieldname; - i = fip->fnfieldlists.size () - 1; - } - - /* Create a new member function field and add it to the vector of - fnfieldlists. */ - flp->fnfields.emplace_back (); - fnp = &flp->fnfields.back (); - - /* Delay processing of the physname until later. */ - if (cu->language == language_cplus) - add_to_method_list (type, i, flp->fnfields.size () - 1, fieldname, - die, cu); - else - { - const char *physname = dwarf2_physname (fieldname, die, cu); - fnp->physname = physname ? physname : ""; - } - - fnp->type = alloc_type (objfile); - this_type = read_type_die (die, cu); - if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC) - { - int nparams = TYPE_NFIELDS (this_type); - - /* TYPE is the domain of this method, and THIS_TYPE is the type - of the method itself (TYPE_CODE_METHOD). */ - smash_to_method_type (fnp->type, type, - TYPE_TARGET_TYPE (this_type), - TYPE_FIELDS (this_type), - TYPE_NFIELDS (this_type), - TYPE_VARARGS (this_type)); - - /* Handle static member functions. - Dwarf2 has no clean way to discern C++ static and non-static - member functions. G++ helps GDB by marking the first - parameter for non-static member functions (which is the this - pointer) as artificial. We obtain this information from - read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */ - if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0) - fnp->voffset = VOFFSET_STATIC; - } - else - complaint (_("member function type missing for '%s'"), - dwarf2_full_name (fieldname, die, cu)); - - /* Get fcontext from DW_AT_containing_type if present. */ - if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL) - fnp->fcontext = die_containing_type (die, cu); - - /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and - is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */ - - /* Get accessibility. */ - attr = dwarf2_attr (die, DW_AT_accessibility, cu); - if (attr != nullptr) - accessibility = (enum dwarf_access_attribute) DW_UNSND (attr); - else - accessibility = dwarf2_default_access_attribute (die, cu); - switch (accessibility) - { - case DW_ACCESS_private: - fnp->is_private = 1; - break; - case DW_ACCESS_protected: - fnp->is_protected = 1; - break; - } - - /* Check for artificial methods. */ - attr = dwarf2_attr (die, DW_AT_artificial, cu); - if (attr && DW_UNSND (attr) != 0) - fnp->is_artificial = 1; - - /* Check for defaulted methods. */ - attr = dwarf2_attr (die, DW_AT_defaulted, cu); - if (attr != nullptr && is_valid_DW_AT_defaulted (DW_UNSND (attr))) - fnp->defaulted = (enum dwarf_defaulted_attribute) DW_UNSND (attr); - - /* Check for deleted methods. */ - attr = dwarf2_attr (die, DW_AT_deleted, cu); - if (attr != nullptr && DW_UNSND (attr) != 0) - fnp->is_deleted = 1; - - fnp->is_constructor = dwarf2_is_constructor (die, cu); - - /* Get index in virtual function table if it is a virtual member - function. For older versions of GCC, this is an offset in the - appropriate virtual table, as specified by DW_AT_containing_type. - For everyone else, it is an expression to be evaluated relative - to the object address. */ - - attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu); - if (attr != nullptr) - { - if (attr->form_is_block () && DW_BLOCK (attr)->size > 0) - { - if (DW_BLOCK (attr)->data[0] == DW_OP_constu) - { - /* Old-style GCC. */ - fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2; - } - else if (DW_BLOCK (attr)->data[0] == DW_OP_deref - || (DW_BLOCK (attr)->size > 1 - && DW_BLOCK (attr)->data[0] == DW_OP_deref_size - && DW_BLOCK (attr)->data[1] == cu->header.addr_size)) - { - fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu); - if ((fnp->voffset % cu->header.addr_size) != 0) - dwarf2_complex_location_expr_complaint (); - else - fnp->voffset /= cu->header.addr_size; - fnp->voffset += 2; - } - else - dwarf2_complex_location_expr_complaint (); - - if (!fnp->fcontext) - { - /* If there is no `this' field and no DW_AT_containing_type, - we cannot actually find a base class context for the - vtable! */ - if (TYPE_NFIELDS (this_type) == 0 - || !TYPE_FIELD_ARTIFICIAL (this_type, 0)) - { - complaint (_("cannot determine context for virtual member " - "function \"%s\" (offset %s)"), - fieldname, sect_offset_str (die->sect_off)); - } - else - { - fnp->fcontext - = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0)); - } - } - } - else if (attr->form_is_section_offset ()) - { - dwarf2_complex_location_expr_complaint (); - } - else - { - dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location", - fieldname); - } - } - else - { - attr = dwarf2_attr (die, DW_AT_virtuality, cu); - if (attr && DW_UNSND (attr)) - { - /* GCC does this, as of 2008-08-25; PR debug/37237. */ - complaint (_("Member function \"%s\" (offset %s) is virtual " - "but the vtable offset is not specified"), - fieldname, sect_offset_str (die->sect_off)); - ALLOCATE_CPLUS_STRUCT_TYPE (type); - TYPE_CPLUS_DYNAMIC (type) = 1; - } - } -} - -/* Create the vector of member function fields, and attach it to the type. */ - -static void -dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type, - struct dwarf2_cu *cu) -{ - if (cu->language == language_ada) - error (_("unexpected member functions in Ada type")); - - ALLOCATE_CPLUS_STRUCT_TYPE (type); - TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *) - TYPE_ALLOC (type, - sizeof (struct fn_fieldlist) * fip->fnfieldlists.size ()); - - for (int i = 0; i < fip->fnfieldlists.size (); i++) - { - struct fnfieldlist &nf = fip->fnfieldlists[i]; - struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i); - - TYPE_FN_FIELDLIST_NAME (type, i) = nf.name; - TYPE_FN_FIELDLIST_LENGTH (type, i) = nf.fnfields.size (); - fn_flp->fn_fields = (struct fn_field *) - TYPE_ALLOC (type, sizeof (struct fn_field) * nf.fnfields.size ()); - - for (int k = 0; k < nf.fnfields.size (); ++k) - fn_flp->fn_fields[k] = nf.fnfields[k]; - } - - TYPE_NFN_FIELDS (type) = fip->fnfieldlists.size (); -} - -/* Returns non-zero if NAME is the name of a vtable member in CU's - language, zero otherwise. */ -static int -is_vtable_name (const char *name, struct dwarf2_cu *cu) -{ - static const char vptr[] = "_vptr"; - - /* Look for the C++ form of the vtable. */ - if (startswith (name, vptr) && is_cplus_marker (name[sizeof (vptr) - 1])) - return 1; - - return 0; -} - -/* GCC outputs unnamed structures that are really pointers to member - functions, with the ABI-specified layout. If TYPE describes - such a structure, smash it into a member function type. - - GCC shouldn't do this; it should just output pointer to member DIEs. - This is GCC PR debug/28767. */ - -static void -quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile) -{ - struct type *pfn_type, *self_type, *new_type; - - /* Check for a structure with no name and two children. */ - if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2) - return; - - /* Check for __pfn and __delta members. */ - if (TYPE_FIELD_NAME (type, 0) == NULL - || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0 - || TYPE_FIELD_NAME (type, 1) == NULL - || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0) - return; - - /* Find the type of the method. */ - pfn_type = TYPE_FIELD_TYPE (type, 0); - if (pfn_type == NULL - || TYPE_CODE (pfn_type) != TYPE_CODE_PTR - || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC) - return; - - /* Look for the "this" argument. */ - pfn_type = TYPE_TARGET_TYPE (pfn_type); - if (TYPE_NFIELDS (pfn_type) == 0 - /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */ - || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR) - return; - - self_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0)); - new_type = alloc_type (objfile); - smash_to_method_type (new_type, self_type, TYPE_TARGET_TYPE (pfn_type), - TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type), - TYPE_VARARGS (pfn_type)); - smash_to_methodptr_type (type, new_type); -} - -/* If the DIE has a DW_AT_alignment attribute, return its value, doing - appropriate error checking and issuing complaints if there is a - problem. */ - -static ULONGEST -get_alignment (struct dwarf2_cu *cu, struct die_info *die) -{ - struct attribute *attr = dwarf2_attr (die, DW_AT_alignment, cu); - - if (attr == nullptr) - return 0; - - if (!attr->form_is_constant ()) - { - complaint (_("DW_AT_alignment must have constant form" - " - DIE at %s [in module %s]"), - sect_offset_str (die->sect_off), - objfile_name (cu->per_cu->dwarf2_per_objfile->objfile)); - return 0; - } - - ULONGEST align; - if (attr->form == DW_FORM_sdata) - { - LONGEST val = DW_SND (attr); - if (val < 0) - { - complaint (_("DW_AT_alignment value must not be negative" - " - DIE at %s [in module %s]"), - sect_offset_str (die->sect_off), - objfile_name (cu->per_cu->dwarf2_per_objfile->objfile)); - return 0; - } - align = val; - } - else - align = DW_UNSND (attr); - - if (align == 0) - { - complaint (_("DW_AT_alignment value must not be zero" - " - DIE at %s [in module %s]"), - sect_offset_str (die->sect_off), - objfile_name (cu->per_cu->dwarf2_per_objfile->objfile)); - return 0; - } - if ((align & (align - 1)) != 0) - { - complaint (_("DW_AT_alignment value must be a power of 2" - " - DIE at %s [in module %s]"), - sect_offset_str (die->sect_off), - objfile_name (cu->per_cu->dwarf2_per_objfile->objfile)); - return 0; - } - - return align; -} - -/* If the DIE has a DW_AT_alignment attribute, use its value to set - the alignment for TYPE. */ - -static void -maybe_set_alignment (struct dwarf2_cu *cu, struct die_info *die, - struct type *type) -{ - if (!set_type_align (type, get_alignment (cu, die))) - complaint (_("DW_AT_alignment value too large" - " - DIE at %s [in module %s]"), - sect_offset_str (die->sect_off), - objfile_name (cu->per_cu->dwarf2_per_objfile->objfile)); -} - -/* Check if the given VALUE is a valid enum dwarf_calling_convention - constant for a type, according to DWARF5 spec, Table 5.5. */ - -static bool -is_valid_DW_AT_calling_convention_for_type (ULONGEST value) -{ - switch (value) - { - case DW_CC_normal: - case DW_CC_pass_by_reference: - case DW_CC_pass_by_value: - return true; - - default: - complaint (_("unrecognized DW_AT_calling_convention value " - "(%s) for a type"), pulongest (value)); - return false; - } -} - -/* Check if the given VALUE is a valid enum dwarf_calling_convention - constant for a subroutine, according to DWARF5 spec, Table 3.3, and - also according to GNU-specific values (see include/dwarf2.h). */ - -static bool -is_valid_DW_AT_calling_convention_for_subroutine (ULONGEST value) -{ - switch (value) - { - case DW_CC_normal: - case DW_CC_program: - case DW_CC_nocall: - return true; - - case DW_CC_GNU_renesas_sh: - case DW_CC_GNU_borland_fastcall_i386: - case DW_CC_GDB_IBM_OpenCL: - return true; - - default: - complaint (_("unrecognized DW_AT_calling_convention value " - "(%s) for a subroutine"), pulongest (value)); - return false; - } -} - -/* Called when we find the DIE that starts a structure or union scope - (definition) to create a type for the structure or union. Fill in - the type's name and general properties; the members will not be - processed until process_structure_scope. A symbol table entry for - the type will also not be done until process_structure_scope (assuming - the type has a name). - - NOTE: we need to call these functions regardless of whether or not the - DIE has a DW_AT_name attribute, since it might be an anonymous - structure or union. This gets the type entered into our set of - user defined types. */ - -static struct type * -read_structure_type (struct die_info *die, struct dwarf2_cu *cu) -{ - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - struct type *type; - struct attribute *attr; - const char *name; - - /* If the definition of this type lives in .debug_types, read that type. - Don't follow DW_AT_specification though, that will take us back up - the chain and we want to go down. */ - attr = dwarf2_attr_no_follow (die, DW_AT_signature); - if (attr != nullptr) - { - type = get_DW_AT_signature_type (die, attr, cu); - - /* The type's CU may not be the same as CU. - Ensure TYPE is recorded with CU in die_type_hash. */ - return set_die_type (die, type, cu); - } - - type = alloc_type (objfile); - INIT_CPLUS_SPECIFIC (type); - - name = dwarf2_name (die, cu); - if (name != NULL) - { - if (cu->language == language_cplus - || cu->language == language_d - || cu->language == language_rust) - { - const char *full_name = dwarf2_full_name (name, die, cu); - - /* dwarf2_full_name might have already finished building the DIE's - type. If so, there is no need to continue. */ - if (get_die_type (die, cu) != NULL) - return get_die_type (die, cu); - - TYPE_NAME (type) = full_name; - } - else - { - /* The name is already allocated along with this objfile, so - we don't need to duplicate it for the type. */ - TYPE_NAME (type) = name; - } - } - - if (die->tag == DW_TAG_structure_type) - { - TYPE_CODE (type) = TYPE_CODE_STRUCT; - } - else if (die->tag == DW_TAG_union_type) - { - TYPE_CODE (type) = TYPE_CODE_UNION; - } - else if (die->tag == DW_TAG_variant_part) - { - TYPE_CODE (type) = TYPE_CODE_UNION; - TYPE_FLAG_DISCRIMINATED_UNION (type) = 1; - } - else - { - TYPE_CODE (type) = TYPE_CODE_STRUCT; - } - - if (cu->language == language_cplus && die->tag == DW_TAG_class_type) - TYPE_DECLARED_CLASS (type) = 1; - - /* Store the calling convention in the type if it's available in - the die. Otherwise the calling convention remains set to - the default value DW_CC_normal. */ - attr = dwarf2_attr (die, DW_AT_calling_convention, cu); - if (attr != nullptr - && is_valid_DW_AT_calling_convention_for_type (DW_UNSND (attr))) - { - ALLOCATE_CPLUS_STRUCT_TYPE (type); - TYPE_CPLUS_CALLING_CONVENTION (type) - = (enum dwarf_calling_convention) (DW_UNSND (attr)); - } - - attr = dwarf2_attr (die, DW_AT_byte_size, cu); - if (attr != nullptr) - { - if (attr->form_is_constant ()) - TYPE_LENGTH (type) = DW_UNSND (attr); - else - { - /* For the moment, dynamic type sizes are not supported - by GDB's struct type. The actual size is determined - on-demand when resolving the type of a given object, - so set the type's length to zero for now. Otherwise, - we record an expression as the length, and that expression - could lead to a very large value, which could eventually - lead to us trying to allocate that much memory when creating - a value of that type. */ - TYPE_LENGTH (type) = 0; - } - } - else - { - TYPE_LENGTH (type) = 0; - } - - maybe_set_alignment (cu, die, type); - - if (producer_is_icc_lt_14 (cu) && (TYPE_LENGTH (type) == 0)) - { - /* ICC<14 does not output the required DW_AT_declaration on - incomplete types, but gives them a size of zero. */ - TYPE_STUB (type) = 1; - } - else - TYPE_STUB_SUPPORTED (type) = 1; - - if (die_is_declaration (die, cu)) - TYPE_STUB (type) = 1; - else if (attr == NULL && die->child == NULL - && producer_is_realview (cu->producer)) - /* RealView does not output the required DW_AT_declaration - on incomplete types. */ - TYPE_STUB (type) = 1; - - /* We need to add the type field to the die immediately so we don't - infinitely recurse when dealing with pointers to the structure - type within the structure itself. */ - set_die_type (die, type, cu); - - /* set_die_type should be already done. */ - set_descriptive_type (type, die, cu); - - return type; -} - -/* A helper for process_structure_scope that handles a single member - DIE. */ - -static void -handle_struct_member_die (struct die_info *child_die, struct type *type, - struct field_info *fi, - std::vector<struct symbol *> *template_args, - struct dwarf2_cu *cu) -{ - if (child_die->tag == DW_TAG_member - || child_die->tag == DW_TAG_variable - || child_die->tag == DW_TAG_variant_part) - { - /* NOTE: carlton/2002-11-05: A C++ static data member - should be a DW_TAG_member that is a declaration, but - all versions of G++ as of this writing (so through at - least 3.2.1) incorrectly generate DW_TAG_variable - tags for them instead. */ - dwarf2_add_field (fi, child_die, cu); - } - else if (child_die->tag == DW_TAG_subprogram) - { - /* Rust doesn't have member functions in the C++ sense. - However, it does emit ordinary functions as children - of a struct DIE. */ - if (cu->language == language_rust) - read_func_scope (child_die, cu); - else - { - /* C++ member function. */ - dwarf2_add_member_fn (fi, child_die, type, cu); - } - } - else if (child_die->tag == DW_TAG_inheritance) - { - /* C++ base class field. */ - dwarf2_add_field (fi, child_die, cu); - } - else if (type_can_define_types (child_die)) - dwarf2_add_type_defn (fi, child_die, cu); - else if (child_die->tag == DW_TAG_template_type_param - || child_die->tag == DW_TAG_template_value_param) - { - struct symbol *arg = new_symbol (child_die, NULL, cu); - - if (arg != NULL) - template_args->push_back (arg); - } - else if (child_die->tag == DW_TAG_variant) - { - /* In a variant we want to get the discriminant and also add a - field for our sole member child. */ - struct attribute *discr = dwarf2_attr (child_die, DW_AT_discr_value, cu); - - for (die_info *variant_child = child_die->child; - variant_child != NULL; - variant_child = sibling_die (variant_child)) - { - if (variant_child->tag == DW_TAG_member) - { - handle_struct_member_die (variant_child, type, fi, - template_args, cu); - /* Only handle the one. */ - break; - } - } - - /* We don't handle this but we might as well report it if we see - it. */ - if (dwarf2_attr (child_die, DW_AT_discr_list, cu) != nullptr) - complaint (_("DW_AT_discr_list is not supported yet" - " - DIE at %s [in module %s]"), - sect_offset_str (child_die->sect_off), - objfile_name (cu->per_cu->dwarf2_per_objfile->objfile)); - - /* The first field was just added, so we can stash the - discriminant there. */ - gdb_assert (!fi->fields.empty ()); - if (discr == NULL) - fi->fields.back ().variant.default_branch = true; - else - fi->fields.back ().variant.discriminant_value = DW_UNSND (discr); - } -} - -/* Finish creating a structure or union type, including filling in - its members and creating a symbol for it. */ - -static void -process_structure_scope (struct die_info *die, struct dwarf2_cu *cu) -{ - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - struct die_info *child_die; - struct type *type; - - type = get_die_type (die, cu); - if (type == NULL) - type = read_structure_type (die, cu); - - /* When reading a DW_TAG_variant_part, we need to notice when we - read the discriminant member, so we can record it later in the - discriminant_info. */ - bool is_variant_part = TYPE_FLAG_DISCRIMINATED_UNION (type); - sect_offset discr_offset {}; - bool has_template_parameters = false; - - if (is_variant_part) - { - struct attribute *discr = dwarf2_attr (die, DW_AT_discr, cu); - if (discr == NULL) - { - /* Maybe it's a univariant form, an extension we support. - In this case arrange not to check the offset. */ - is_variant_part = false; - } - else if (discr->form_is_ref ()) - { - struct dwarf2_cu *target_cu = cu; - struct die_info *target_die = follow_die_ref (die, discr, &target_cu); - - discr_offset = target_die->sect_off; - } - else - { - complaint (_("DW_AT_discr does not have DIE reference form" - " - DIE at %s [in module %s]"), - sect_offset_str (die->sect_off), - objfile_name (cu->per_cu->dwarf2_per_objfile->objfile)); - is_variant_part = false; - } - } - - if (die->child != NULL && ! die_is_declaration (die, cu)) - { - struct field_info fi; - std::vector<struct symbol *> template_args; - - child_die = die->child; - - while (child_die && child_die->tag) - { - handle_struct_member_die (child_die, type, &fi, &template_args, cu); - - if (is_variant_part && discr_offset == child_die->sect_off) - fi.fields.back ().variant.is_discriminant = true; - - child_die = sibling_die (child_die); - } - - /* Attach template arguments to type. */ - if (!template_args.empty ()) - { - has_template_parameters = true; - ALLOCATE_CPLUS_STRUCT_TYPE (type); - TYPE_N_TEMPLATE_ARGUMENTS (type) = template_args.size (); - TYPE_TEMPLATE_ARGUMENTS (type) - = XOBNEWVEC (&objfile->objfile_obstack, - struct symbol *, - TYPE_N_TEMPLATE_ARGUMENTS (type)); - memcpy (TYPE_TEMPLATE_ARGUMENTS (type), - template_args.data (), - (TYPE_N_TEMPLATE_ARGUMENTS (type) - * sizeof (struct symbol *))); - } - - /* Attach fields and member functions to the type. */ - if (fi.nfields) - dwarf2_attach_fields_to_type (&fi, type, cu); - if (!fi.fnfieldlists.empty ()) - { - dwarf2_attach_fn_fields_to_type (&fi, type, cu); - - /* Get the type which refers to the base class (possibly this - class itself) which contains the vtable pointer for the current - class from the DW_AT_containing_type attribute. This use of - DW_AT_containing_type is a GNU extension. */ - - if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL) - { - struct type *t = die_containing_type (die, cu); - - set_type_vptr_basetype (type, t); - if (type == t) - { - int i; - - /* Our own class provides vtbl ptr. */ - for (i = TYPE_NFIELDS (t) - 1; - i >= TYPE_N_BASECLASSES (t); - --i) - { - const char *fieldname = TYPE_FIELD_NAME (t, i); - - if (is_vtable_name (fieldname, cu)) - { - set_type_vptr_fieldno (type, i); - break; - } - } - - /* Complain if virtual function table field not found. */ - if (i < TYPE_N_BASECLASSES (t)) - complaint (_("virtual function table pointer " - "not found when defining class '%s'"), - TYPE_NAME (type) ? TYPE_NAME (type) : ""); - } - else - { - set_type_vptr_fieldno (type, TYPE_VPTR_FIELDNO (t)); - } - } - else if (cu->producer - && startswith (cu->producer, "IBM(R) XL C/C++ Advanced Edition")) - { - /* The IBM XLC compiler does not provide direct indication - of the containing type, but the vtable pointer is - always named __vfp. */ - - int i; - - for (i = TYPE_NFIELDS (type) - 1; - i >= TYPE_N_BASECLASSES (type); - --i) - { - if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0) - { - set_type_vptr_fieldno (type, i); - set_type_vptr_basetype (type, type); - break; - } - } - } - } - - /* Copy fi.typedef_field_list linked list elements content into the - allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */ - if (!fi.typedef_field_list.empty ()) - { - int count = fi.typedef_field_list.size (); - - ALLOCATE_CPLUS_STRUCT_TYPE (type); - TYPE_TYPEDEF_FIELD_ARRAY (type) - = ((struct decl_field *) - TYPE_ALLOC (type, - sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * count)); - TYPE_TYPEDEF_FIELD_COUNT (type) = count; - - for (int i = 0; i < fi.typedef_field_list.size (); ++i) - TYPE_TYPEDEF_FIELD (type, i) = fi.typedef_field_list[i]; - } - - /* Copy fi.nested_types_list linked list elements content into the - allocated array TYPE_NESTED_TYPES_ARRAY (type). */ - if (!fi.nested_types_list.empty () && cu->language != language_ada) - { - int count = fi.nested_types_list.size (); - - ALLOCATE_CPLUS_STRUCT_TYPE (type); - TYPE_NESTED_TYPES_ARRAY (type) - = ((struct decl_field *) - TYPE_ALLOC (type, sizeof (struct decl_field) * count)); - TYPE_NESTED_TYPES_COUNT (type) = count; - - for (int i = 0; i < fi.nested_types_list.size (); ++i) - TYPE_NESTED_TYPES_FIELD (type, i) = fi.nested_types_list[i]; - } - } - - quirk_gcc_member_function_pointer (type, objfile); - if (cu->language == language_rust && die->tag == DW_TAG_union_type) - cu->rust_unions.push_back (type); - - /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its - snapshots) has been known to create a die giving a declaration - for a class that has, as a child, a die giving a definition for a - nested class. So we have to process our children even if the - current die is a declaration. Normally, of course, a declaration - won't have any children at all. */ - - child_die = die->child; - - while (child_die != NULL && child_die->tag) - { - if (child_die->tag == DW_TAG_member - || child_die->tag == DW_TAG_variable - || child_die->tag == DW_TAG_inheritance - || child_die->tag == DW_TAG_template_value_param - || child_die->tag == DW_TAG_template_type_param) - { - /* Do nothing. */ - } - else - process_die (child_die, cu); - - child_die = sibling_die (child_die); - } - - /* Do not consider external references. According to the DWARF standard, - these DIEs are identified by the fact that they have no byte_size - attribute, and a declaration attribute. */ - if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL - || !die_is_declaration (die, cu)) - { - struct symbol *sym = new_symbol (die, type, cu); - - if (has_template_parameters) - { - struct symtab *symtab; - if (sym != nullptr) - symtab = symbol_symtab (sym); - else if (cu->line_header != nullptr) - { - /* Any related symtab will do. */ - symtab - = cu->line_header->file_names ()[0].symtab; - } - else - { - symtab = nullptr; - complaint (_("could not find suitable " - "symtab for template parameter" - " - DIE at %s [in module %s]"), - sect_offset_str (die->sect_off), - objfile_name (objfile)); - } - - if (symtab != nullptr) - { - /* Make sure that the symtab is set on the new symbols. - Even though they don't appear in this symtab directly, - other parts of gdb assume that symbols do, and this is - reasonably true. */ - for (int i = 0; i < TYPE_N_TEMPLATE_ARGUMENTS (type); ++i) - symbol_set_symtab (TYPE_TEMPLATE_ARGUMENT (type, i), symtab); - } - } - } -} - -/* Assuming DIE is an enumeration type, and TYPE is its associated type, - update TYPE using some information only available in DIE's children. */ - -static void -update_enumeration_type_from_children (struct die_info *die, - struct type *type, - struct dwarf2_cu *cu) -{ - struct die_info *child_die; - int unsigned_enum = 1; - int flag_enum = 1; - ULONGEST mask = 0; - - auto_obstack obstack; - - for (child_die = die->child; - child_die != NULL && child_die->tag; - child_die = sibling_die (child_die)) - { - struct attribute *attr; - LONGEST value; - const gdb_byte *bytes; - struct dwarf2_locexpr_baton *baton; - const char *name; - - if (child_die->tag != DW_TAG_enumerator) - continue; - - attr = dwarf2_attr (child_die, DW_AT_const_value, cu); - if (attr == NULL) - continue; - - name = dwarf2_name (child_die, cu); - if (name == NULL) - name = "<anonymous enumerator>"; - - dwarf2_const_value_attr (attr, type, name, &obstack, cu, - &value, &bytes, &baton); - if (value < 0) - { - unsigned_enum = 0; - flag_enum = 0; - } - else if ((mask & value) != 0) - flag_enum = 0; - else - mask |= value; - - /* If we already know that the enum type is neither unsigned, nor - a flag type, no need to look at the rest of the enumerates. */ - if (!unsigned_enum && !flag_enum) - break; - } - - if (unsigned_enum) - TYPE_UNSIGNED (type) = 1; - if (flag_enum) - TYPE_FLAG_ENUM (type) = 1; -} - -/* Given a DW_AT_enumeration_type die, set its type. We do not - complete the type's fields yet, or create any symbols. */ - -static struct type * -read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu) -{ - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - struct type *type; - struct attribute *attr; - const char *name; - - /* If the definition of this type lives in .debug_types, read that type. - Don't follow DW_AT_specification though, that will take us back up - the chain and we want to go down. */ - attr = dwarf2_attr_no_follow (die, DW_AT_signature); - if (attr != nullptr) - { - type = get_DW_AT_signature_type (die, attr, cu); - - /* The type's CU may not be the same as CU. - Ensure TYPE is recorded with CU in die_type_hash. */ - return set_die_type (die, type, cu); - } - - type = alloc_type (objfile); - - TYPE_CODE (type) = TYPE_CODE_ENUM; - name = dwarf2_full_name (NULL, die, cu); - if (name != NULL) - TYPE_NAME (type) = name; - - attr = dwarf2_attr (die, DW_AT_type, cu); - if (attr != NULL) - { - struct type *underlying_type = die_type (die, cu); - - TYPE_TARGET_TYPE (type) = underlying_type; - } - - attr = dwarf2_attr (die, DW_AT_byte_size, cu); - if (attr != nullptr) - { - TYPE_LENGTH (type) = DW_UNSND (attr); - } - else - { - TYPE_LENGTH (type) = 0; - } - - maybe_set_alignment (cu, die, type); - - /* The enumeration DIE can be incomplete. In Ada, any type can be - declared as private in the package spec, and then defined only - inside the package body. Such types are known as Taft Amendment - Types. When another package uses such a type, an incomplete DIE - may be generated by the compiler. */ - if (die_is_declaration (die, cu)) - TYPE_STUB (type) = 1; - - /* Finish the creation of this type by using the enum's children. - We must call this even when the underlying type has been provided - so that we can determine if we're looking at a "flag" enum. */ - update_enumeration_type_from_children (die, type, cu); - - /* If this type has an underlying type that is not a stub, then we - may use its attributes. We always use the "unsigned" attribute - in this situation, because ordinarily we guess whether the type - is unsigned -- but the guess can be wrong and the underlying type - can tell us the reality. However, we defer to a local size - attribute if one exists, because this lets the compiler override - the underlying type if needed. */ - if (TYPE_TARGET_TYPE (type) != NULL && !TYPE_STUB (TYPE_TARGET_TYPE (type))) - { - TYPE_UNSIGNED (type) = TYPE_UNSIGNED (TYPE_TARGET_TYPE (type)); - if (TYPE_LENGTH (type) == 0) - TYPE_LENGTH (type) = TYPE_LENGTH (TYPE_TARGET_TYPE (type)); - if (TYPE_RAW_ALIGN (type) == 0 - && TYPE_RAW_ALIGN (TYPE_TARGET_TYPE (type)) != 0) - set_type_align (type, TYPE_RAW_ALIGN (TYPE_TARGET_TYPE (type))); - } - - TYPE_DECLARED_CLASS (type) = dwarf2_flag_true_p (die, DW_AT_enum_class, cu); - - return set_die_type (die, type, cu); -} - -/* Given a pointer to a die which begins an enumeration, process all - the dies that define the members of the enumeration, and create the - symbol for the enumeration type. - - NOTE: We reverse the order of the element list. */ - -static void -process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu) -{ - struct type *this_type; - - this_type = get_die_type (die, cu); - if (this_type == NULL) - this_type = read_enumeration_type (die, cu); - - if (die->child != NULL) - { - struct die_info *child_die; - struct symbol *sym; - std::vector<struct field> fields; - const char *name; - - child_die = die->child; - while (child_die && child_die->tag) - { - if (child_die->tag != DW_TAG_enumerator) - { - process_die (child_die, cu); - } - else - { - name = dwarf2_name (child_die, cu); - if (name) - { - sym = new_symbol (child_die, this_type, cu); - - fields.emplace_back (); - struct field &field = fields.back (); - - FIELD_NAME (field) = sym->linkage_name (); - FIELD_TYPE (field) = NULL; - SET_FIELD_ENUMVAL (field, SYMBOL_VALUE (sym)); - FIELD_BITSIZE (field) = 0; - } - } - - child_die = sibling_die (child_die); - } - - if (!fields.empty ()) - { - TYPE_NFIELDS (this_type) = fields.size (); - TYPE_FIELDS (this_type) = (struct field *) - TYPE_ALLOC (this_type, sizeof (struct field) * fields.size ()); - memcpy (TYPE_FIELDS (this_type), fields.data (), - sizeof (struct field) * fields.size ()); - } - } - - /* If we are reading an enum from a .debug_types unit, and the enum - is a declaration, and the enum is not the signatured type in the - unit, then we do not want to add a symbol for it. Adding a - symbol would in some cases obscure the true definition of the - enum, giving users an incomplete type when the definition is - actually available. Note that we do not want to do this for all - enums which are just declarations, because C++0x allows forward - enum declarations. */ - if (cu->per_cu->is_debug_types - && die_is_declaration (die, cu)) - { - struct signatured_type *sig_type; - - sig_type = (struct signatured_type *) cu->per_cu; - gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0); - if (sig_type->type_offset_in_section != die->sect_off) - return; - } - - new_symbol (die, this_type, cu); -} - -/* Extract all information from a DW_TAG_array_type DIE and put it in - the DIE's type field. For now, this only handles one dimensional - arrays. */ - -static struct type * -read_array_type (struct die_info *die, struct dwarf2_cu *cu) -{ - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - struct die_info *child_die; - struct type *type; - struct type *element_type, *range_type, *index_type; - struct attribute *attr; - const char *name; - struct dynamic_prop *byte_stride_prop = NULL; - unsigned int bit_stride = 0; - - element_type = die_type (die, cu); - - /* The die_type call above may have already set the type for this DIE. */ - type = get_die_type (die, cu); - if (type) - return type; - - attr = dwarf2_attr (die, DW_AT_byte_stride, cu); - if (attr != NULL) - { - int stride_ok; - struct type *prop_type - = dwarf2_per_cu_addr_sized_int_type (cu->per_cu, false); - - byte_stride_prop - = (struct dynamic_prop *) alloca (sizeof (struct dynamic_prop)); - stride_ok = attr_to_dynamic_prop (attr, die, cu, byte_stride_prop, - prop_type); - if (!stride_ok) - { - complaint (_("unable to read array DW_AT_byte_stride " - " - DIE at %s [in module %s]"), - sect_offset_str (die->sect_off), - objfile_name (cu->per_cu->dwarf2_per_objfile->objfile)); - /* Ignore this attribute. We will likely not be able to print - arrays of this type correctly, but there is little we can do - to help if we cannot read the attribute's value. */ - byte_stride_prop = NULL; - } - } - - attr = dwarf2_attr (die, DW_AT_bit_stride, cu); - if (attr != NULL) - bit_stride = DW_UNSND (attr); - - /* Irix 6.2 native cc creates array types without children for - arrays with unspecified length. */ - if (die->child == NULL) - { - index_type = objfile_type (objfile)->builtin_int; - range_type = create_static_range_type (NULL, index_type, 0, -1); - type = create_array_type_with_stride (NULL, element_type, range_type, - byte_stride_prop, bit_stride); - return set_die_type (die, type, cu); - } - - std::vector<struct type *> range_types; - child_die = die->child; - while (child_die && child_die->tag) - { - if (child_die->tag == DW_TAG_subrange_type) - { - struct type *child_type = read_type_die (child_die, cu); - - if (child_type != NULL) - { - /* The range type was succesfully read. Save it for the - array type creation. */ - range_types.push_back (child_type); - } - } - child_die = sibling_die (child_die); - } - - /* Dwarf2 dimensions are output from left to right, create the - necessary array types in backwards order. */ - - type = element_type; - - if (read_array_order (die, cu) == DW_ORD_col_major) - { - int i = 0; - - while (i < range_types.size ()) - type = create_array_type_with_stride (NULL, type, range_types[i++], - byte_stride_prop, bit_stride); - } - else - { - size_t ndim = range_types.size (); - while (ndim-- > 0) - type = create_array_type_with_stride (NULL, type, range_types[ndim], - byte_stride_prop, bit_stride); - } - - /* Understand Dwarf2 support for vector types (like they occur on - the PowerPC w/ AltiVec). Gcc just adds another attribute to the - array type. This is not part of the Dwarf2/3 standard yet, but a - custom vendor extension. The main difference between a regular - array and the vector variant is that vectors are passed by value - to functions. */ - attr = dwarf2_attr (die, DW_AT_GNU_vector, cu); - if (attr != nullptr) - make_vector_type (type); - - /* The DIE may have DW_AT_byte_size set. For example an OpenCL - implementation may choose to implement triple vectors using this - attribute. */ - attr = dwarf2_attr (die, DW_AT_byte_size, cu); - if (attr != nullptr) - { - if (DW_UNSND (attr) >= TYPE_LENGTH (type)) - TYPE_LENGTH (type) = DW_UNSND (attr); - else - complaint (_("DW_AT_byte_size for array type smaller " - "than the total size of elements")); - } - - name = dwarf2_name (die, cu); - if (name) - TYPE_NAME (type) = name; - - maybe_set_alignment (cu, die, type); - - /* Install the type in the die. */ - set_die_type (die, type, cu); - - /* set_die_type should be already done. */ - set_descriptive_type (type, die, cu); - - return type; -} - -static enum dwarf_array_dim_ordering -read_array_order (struct die_info *die, struct dwarf2_cu *cu) -{ - struct attribute *attr; - - attr = dwarf2_attr (die, DW_AT_ordering, cu); - - if (attr != nullptr) - return (enum dwarf_array_dim_ordering) DW_SND (attr); - - /* GNU F77 is a special case, as at 08/2004 array type info is the - opposite order to the dwarf2 specification, but data is still - laid out as per normal fortran. - - FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need - version checking. */ - - if (cu->language == language_fortran - && cu->producer && strstr (cu->producer, "GNU F77")) - { - return DW_ORD_row_major; - } - - switch (cu->language_defn->la_array_ordering) - { - case array_column_major: - return DW_ORD_col_major; - case array_row_major: - default: - return DW_ORD_row_major; - }; -} - -/* Extract all information from a DW_TAG_set_type DIE and put it in - the DIE's type field. */ - -static struct type * -read_set_type (struct die_info *die, struct dwarf2_cu *cu) -{ - struct type *domain_type, *set_type; - struct attribute *attr; - - domain_type = die_type (die, cu); - - /* The die_type call above may have already set the type for this DIE. */ - set_type = get_die_type (die, cu); - if (set_type) - return set_type; - - set_type = create_set_type (NULL, domain_type); - - attr = dwarf2_attr (die, DW_AT_byte_size, cu); - if (attr != nullptr) - TYPE_LENGTH (set_type) = DW_UNSND (attr); - - maybe_set_alignment (cu, die, set_type); - - return set_die_type (die, set_type, cu); -} - -/* A helper for read_common_block that creates a locexpr baton. - SYM is the symbol which we are marking as computed. - COMMON_DIE is the DIE for the common block. - COMMON_LOC is the location expression attribute for the common - block itself. - MEMBER_LOC is the location expression attribute for the particular - member of the common block that we are processing. - CU is the CU from which the above come. */ - -static void -mark_common_block_symbol_computed (struct symbol *sym, - struct die_info *common_die, - struct attribute *common_loc, - struct attribute *member_loc, - struct dwarf2_cu *cu) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - struct objfile *objfile = dwarf2_per_objfile->objfile; - struct dwarf2_locexpr_baton *baton; - gdb_byte *ptr; - unsigned int cu_off; - enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile)); - LONGEST offset = 0; - - gdb_assert (common_loc && member_loc); - gdb_assert (common_loc->form_is_block ()); - gdb_assert (member_loc->form_is_block () - || member_loc->form_is_constant ()); - - baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton); - baton->per_cu = cu->per_cu; - gdb_assert (baton->per_cu); - - baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */; - - if (member_loc->form_is_constant ()) - { - offset = dwarf2_get_attr_constant_value (member_loc, 0); - baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size; - } - else - baton->size += DW_BLOCK (member_loc)->size; - - ptr = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, baton->size); - baton->data = ptr; - - *ptr++ = DW_OP_call4; - cu_off = common_die->sect_off - cu->per_cu->sect_off; - store_unsigned_integer (ptr, 4, byte_order, cu_off); - ptr += 4; - - if (member_loc->form_is_constant ()) - { - *ptr++ = DW_OP_addr; - store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset); - ptr += cu->header.addr_size; - } - else - { - /* We have to copy the data here, because DW_OP_call4 will only - use a DW_AT_location attribute. */ - memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size); - ptr += DW_BLOCK (member_loc)->size; - } - - *ptr++ = DW_OP_plus; - gdb_assert (ptr - baton->data == baton->size); - - SYMBOL_LOCATION_BATON (sym) = baton; - SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index; -} - -/* Create appropriate locally-scoped variables for all the - DW_TAG_common_block entries. Also create a struct common_block - listing all such variables for `info common'. COMMON_BLOCK_DOMAIN - is used to separate the common blocks name namespace from regular - variable names. */ - -static void -read_common_block (struct die_info *die, struct dwarf2_cu *cu) -{ - struct attribute *attr; - - attr = dwarf2_attr (die, DW_AT_location, cu); - if (attr != nullptr) - { - /* Support the .debug_loc offsets. */ - if (attr->form_is_block ()) - { - /* Ok. */ - } - else if (attr->form_is_section_offset ()) - { - dwarf2_complex_location_expr_complaint (); - attr = NULL; - } - else - { - dwarf2_invalid_attrib_class_complaint ("DW_AT_location", - "common block member"); - attr = NULL; - } - } - - if (die->child != NULL) - { - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - struct die_info *child_die; - size_t n_entries = 0, size; - struct common_block *common_block; - struct symbol *sym; - - for (child_die = die->child; - child_die && child_die->tag; - child_die = sibling_die (child_die)) - ++n_entries; - - size = (sizeof (struct common_block) - + (n_entries - 1) * sizeof (struct symbol *)); - common_block - = (struct common_block *) obstack_alloc (&objfile->objfile_obstack, - size); - memset (common_block->contents, 0, n_entries * sizeof (struct symbol *)); - common_block->n_entries = 0; - - for (child_die = die->child; - child_die && child_die->tag; - child_die = sibling_die (child_die)) - { - /* Create the symbol in the DW_TAG_common_block block in the current - symbol scope. */ - sym = new_symbol (child_die, NULL, cu); - if (sym != NULL) - { - struct attribute *member_loc; - - common_block->contents[common_block->n_entries++] = sym; - - member_loc = dwarf2_attr (child_die, DW_AT_data_member_location, - cu); - if (member_loc) - { - /* GDB has handled this for a long time, but it is - not specified by DWARF. It seems to have been - emitted by gfortran at least as recently as: - http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */ - complaint (_("Variable in common block has " - "DW_AT_data_member_location " - "- DIE at %s [in module %s]"), - sect_offset_str (child_die->sect_off), - objfile_name (objfile)); - - if (member_loc->form_is_section_offset ()) - dwarf2_complex_location_expr_complaint (); - else if (member_loc->form_is_constant () - || member_loc->form_is_block ()) - { - if (attr != nullptr) - mark_common_block_symbol_computed (sym, die, attr, - member_loc, cu); - } - else - dwarf2_complex_location_expr_complaint (); - } - } - } - - sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu); - SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block; - } -} - -/* Create a type for a C++ namespace. */ - -static struct type * -read_namespace_type (struct die_info *die, struct dwarf2_cu *cu) -{ - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - const char *previous_prefix, *name; - int is_anonymous; - struct type *type; - - /* For extensions, reuse the type of the original namespace. */ - if (dwarf2_attr (die, DW_AT_extension, cu) != NULL) - { - struct die_info *ext_die; - struct dwarf2_cu *ext_cu = cu; - - ext_die = dwarf2_extension (die, &ext_cu); - type = read_type_die (ext_die, ext_cu); - - /* EXT_CU may not be the same as CU. - Ensure TYPE is recorded with CU in die_type_hash. */ - return set_die_type (die, type, cu); - } - - name = namespace_name (die, &is_anonymous, cu); - - /* Now build the name of the current namespace. */ - - previous_prefix = determine_prefix (die, cu); - if (previous_prefix[0] != '\0') - name = typename_concat (&objfile->objfile_obstack, - previous_prefix, name, 0, cu); - - /* Create the type. */ - type = init_type (objfile, TYPE_CODE_NAMESPACE, 0, name); - - return set_die_type (die, type, cu); -} - -/* Read a namespace scope. */ - -static void -read_namespace (struct die_info *die, struct dwarf2_cu *cu) -{ - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - int is_anonymous; - - /* Add a symbol associated to this if we haven't seen the namespace - before. Also, add a using directive if it's an anonymous - namespace. */ - - if (dwarf2_attr (die, DW_AT_extension, cu) == NULL) - { - struct type *type; - - type = read_type_die (die, cu); - new_symbol (die, type, cu); - - namespace_name (die, &is_anonymous, cu); - if (is_anonymous) - { - const char *previous_prefix = determine_prefix (die, cu); - - std::vector<const char *> excludes; - add_using_directive (using_directives (cu), - previous_prefix, TYPE_NAME (type), NULL, - NULL, excludes, 0, &objfile->objfile_obstack); - } - } - - if (die->child != NULL) - { - struct die_info *child_die = die->child; - - while (child_die && child_die->tag) - { - process_die (child_die, cu); - child_die = sibling_die (child_die); - } - } -} - -/* Read a Fortran module as type. This DIE can be only a declaration used for - imported module. Still we need that type as local Fortran "use ... only" - declaration imports depend on the created type in determine_prefix. */ - -static struct type * -read_module_type (struct die_info *die, struct dwarf2_cu *cu) -{ - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - const char *module_name; - struct type *type; - - module_name = dwarf2_name (die, cu); - type = init_type (objfile, TYPE_CODE_MODULE, 0, module_name); - - return set_die_type (die, type, cu); -} - -/* Read a Fortran module. */ - -static void -read_module (struct die_info *die, struct dwarf2_cu *cu) -{ - struct die_info *child_die = die->child; - struct type *type; - - type = read_type_die (die, cu); - new_symbol (die, type, cu); - - while (child_die && child_die->tag) - { - process_die (child_die, cu); - child_die = sibling_die (child_die); - } -} - -/* Return the name of the namespace represented by DIE. Set - *IS_ANONYMOUS to tell whether or not the namespace is an anonymous - namespace. */ - -static const char * -namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu) -{ - struct die_info *current_die; - const char *name = NULL; - - /* Loop through the extensions until we find a name. */ - - for (current_die = die; - current_die != NULL; - current_die = dwarf2_extension (die, &cu)) - { - /* We don't use dwarf2_name here so that we can detect the absence - of a name -> anonymous namespace. */ - name = dwarf2_string_attr (die, DW_AT_name, cu); - - if (name != NULL) - break; - } - - /* Is it an anonymous namespace? */ - - *is_anonymous = (name == NULL); - if (*is_anonymous) - name = CP_ANONYMOUS_NAMESPACE_STR; - - return name; -} - -/* Extract all information from a DW_TAG_pointer_type DIE and add to - the user defined type vector. */ - -static struct type * -read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu) -{ - struct gdbarch *gdbarch - = get_objfile_arch (cu->per_cu->dwarf2_per_objfile->objfile); - struct comp_unit_head *cu_header = &cu->header; - struct type *type; - struct attribute *attr_byte_size; - struct attribute *attr_address_class; - int byte_size, addr_class; - struct type *target_type; - - target_type = die_type (die, cu); - - /* The die_type call above may have already set the type for this DIE. */ - type = get_die_type (die, cu); - if (type) - return type; - - type = lookup_pointer_type (target_type); - - attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu); - if (attr_byte_size) - byte_size = DW_UNSND (attr_byte_size); - else - byte_size = cu_header->addr_size; - - attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu); - if (attr_address_class) - addr_class = DW_UNSND (attr_address_class); - else - addr_class = DW_ADDR_none; - - ULONGEST alignment = get_alignment (cu, die); - - /* If the pointer size, alignment, or address class is different - than the default, create a type variant marked as such and set - the length accordingly. */ - if (TYPE_LENGTH (type) != byte_size - || (alignment != 0 && TYPE_RAW_ALIGN (type) != 0 - && alignment != TYPE_RAW_ALIGN (type)) - || addr_class != DW_ADDR_none) - { - if (gdbarch_address_class_type_flags_p (gdbarch)) - { - int type_flags; - - type_flags = gdbarch_address_class_type_flags - (gdbarch, byte_size, addr_class); - gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL) - == 0); - type = make_type_with_address_space (type, type_flags); - } - else if (TYPE_LENGTH (type) != byte_size) - { - complaint (_("invalid pointer size %d"), byte_size); - } - else if (TYPE_RAW_ALIGN (type) != alignment) - { - complaint (_("Invalid DW_AT_alignment" - " - DIE at %s [in module %s]"), - sect_offset_str (die->sect_off), - objfile_name (cu->per_cu->dwarf2_per_objfile->objfile)); - } - else - { - /* Should we also complain about unhandled address classes? */ - } - } - - TYPE_LENGTH (type) = byte_size; - set_type_align (type, alignment); - return set_die_type (die, type, cu); -} - -/* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to - the user defined type vector. */ - -static struct type * -read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu) -{ - struct type *type; - struct type *to_type; - struct type *domain; - - to_type = die_type (die, cu); - domain = die_containing_type (die, cu); - - /* The calls above may have already set the type for this DIE. */ - type = get_die_type (die, cu); - if (type) - return type; - - if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD) - type = lookup_methodptr_type (to_type); - else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC) - { - struct type *new_type - = alloc_type (cu->per_cu->dwarf2_per_objfile->objfile); - - smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type), - TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type), - TYPE_VARARGS (to_type)); - type = lookup_methodptr_type (new_type); - } - else - type = lookup_memberptr_type (to_type, domain); - - return set_die_type (die, type, cu); -} - -/* Extract all information from a DW_TAG_{rvalue_,}reference_type DIE and add to - the user defined type vector. */ - -static struct type * -read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu, - enum type_code refcode) -{ - struct comp_unit_head *cu_header = &cu->header; - struct type *type, *target_type; - struct attribute *attr; - - gdb_assert (refcode == TYPE_CODE_REF || refcode == TYPE_CODE_RVALUE_REF); - - target_type = die_type (die, cu); - - /* The die_type call above may have already set the type for this DIE. */ - type = get_die_type (die, cu); - if (type) - return type; - - type = lookup_reference_type (target_type, refcode); - attr = dwarf2_attr (die, DW_AT_byte_size, cu); - if (attr != nullptr) - { - TYPE_LENGTH (type) = DW_UNSND (attr); - } - else - { - TYPE_LENGTH (type) = cu_header->addr_size; - } - maybe_set_alignment (cu, die, type); - return set_die_type (die, type, cu); -} - -/* Add the given cv-qualifiers to the element type of the array. GCC - outputs DWARF type qualifiers that apply to an array, not the - element type. But GDB relies on the array element type to carry - the cv-qualifiers. This mimics section 6.7.3 of the C99 - specification. */ - -static struct type * -add_array_cv_type (struct die_info *die, struct dwarf2_cu *cu, - struct type *base_type, int cnst, int voltl) -{ - struct type *el_type, *inner_array; - - base_type = copy_type (base_type); - inner_array = base_type; - - while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY) - { - TYPE_TARGET_TYPE (inner_array) = - copy_type (TYPE_TARGET_TYPE (inner_array)); - inner_array = TYPE_TARGET_TYPE (inner_array); - } - - el_type = TYPE_TARGET_TYPE (inner_array); - cnst |= TYPE_CONST (el_type); - voltl |= TYPE_VOLATILE (el_type); - TYPE_TARGET_TYPE (inner_array) = make_cv_type (cnst, voltl, el_type, NULL); - - return set_die_type (die, base_type, cu); -} - -static struct type * -read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu) -{ - struct type *base_type, *cv_type; - - base_type = die_type (die, cu); - - /* The die_type call above may have already set the type for this DIE. */ - cv_type = get_die_type (die, cu); - if (cv_type) - return cv_type; - - /* In case the const qualifier is applied to an array type, the element type - is so qualified, not the array type (section 6.7.3 of C99). */ - if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY) - return add_array_cv_type (die, cu, base_type, 1, 0); - - cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0); - return set_die_type (die, cv_type, cu); -} - -static struct type * -read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu) -{ - struct type *base_type, *cv_type; - - base_type = die_type (die, cu); - - /* The die_type call above may have already set the type for this DIE. */ - cv_type = get_die_type (die, cu); - if (cv_type) - return cv_type; - - /* In case the volatile qualifier is applied to an array type, the - element type is so qualified, not the array type (section 6.7.3 - of C99). */ - if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY) - return add_array_cv_type (die, cu, base_type, 0, 1); - - cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0); - return set_die_type (die, cv_type, cu); -} - -/* Handle DW_TAG_restrict_type. */ - -static struct type * -read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu) -{ - struct type *base_type, *cv_type; - - base_type = die_type (die, cu); - - /* The die_type call above may have already set the type for this DIE. */ - cv_type = get_die_type (die, cu); - if (cv_type) - return cv_type; - - cv_type = make_restrict_type (base_type); - return set_die_type (die, cv_type, cu); -} - -/* Handle DW_TAG_atomic_type. */ - -static struct type * -read_tag_atomic_type (struct die_info *die, struct dwarf2_cu *cu) -{ - struct type *base_type, *cv_type; - - base_type = die_type (die, cu); - - /* The die_type call above may have already set the type for this DIE. */ - cv_type = get_die_type (die, cu); - if (cv_type) - return cv_type; - - cv_type = make_atomic_type (base_type); - return set_die_type (die, cv_type, cu); -} - -/* Extract all information from a DW_TAG_string_type DIE and add to - the user defined type vector. It isn't really a user defined type, - but it behaves like one, with other DIE's using an AT_user_def_type - attribute to reference it. */ - -static struct type * -read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu) -{ - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - struct gdbarch *gdbarch = get_objfile_arch (objfile); - struct type *type, *range_type, *index_type, *char_type; - struct attribute *attr; - struct dynamic_prop prop; - bool length_is_constant = true; - LONGEST length; - - /* There are a couple of places where bit sizes might be made use of - when parsing a DW_TAG_string_type, however, no producer that we know - of make use of these. Handling bit sizes that are a multiple of the - byte size is easy enough, but what about other bit sizes? Lets deal - with that problem when we have to. Warn about these attributes being - unsupported, then parse the type and ignore them like we always - have. */ - if (dwarf2_attr (die, DW_AT_bit_size, cu) != nullptr - || dwarf2_attr (die, DW_AT_string_length_bit_size, cu) != nullptr) - { - static bool warning_printed = false; - if (!warning_printed) - { - warning (_("DW_AT_bit_size and DW_AT_string_length_bit_size not " - "currently supported on DW_TAG_string_type.")); - warning_printed = true; - } - } - - attr = dwarf2_attr (die, DW_AT_string_length, cu); - if (attr != nullptr && !attr->form_is_constant ()) - { - /* The string length describes the location at which the length of - the string can be found. The size of the length field can be - specified with one of the attributes below. */ - struct type *prop_type; - struct attribute *len - = dwarf2_attr (die, DW_AT_string_length_byte_size, cu); - if (len == nullptr) - len = dwarf2_attr (die, DW_AT_byte_size, cu); - if (len != nullptr && len->form_is_constant ()) - { - /* Pass 0 as the default as we know this attribute is constant - and the default value will not be returned. */ - LONGEST sz = dwarf2_get_attr_constant_value (len, 0); - prop_type = dwarf2_per_cu_int_type (cu->per_cu, sz, true); - } - else - { - /* If the size is not specified then we assume it is the size of - an address on this target. */ - prop_type = dwarf2_per_cu_addr_sized_int_type (cu->per_cu, true); - } - - /* Convert the attribute into a dynamic property. */ - if (!attr_to_dynamic_prop (attr, die, cu, &prop, prop_type)) - length = 1; - else - length_is_constant = false; - } - else if (attr != nullptr) - { - /* This DW_AT_string_length just contains the length with no - indirection. There's no need to create a dynamic property in this - case. Pass 0 for the default value as we know it will not be - returned in this case. */ - length = dwarf2_get_attr_constant_value (attr, 0); - } - else if ((attr = dwarf2_attr (die, DW_AT_byte_size, cu)) != nullptr) - { - /* We don't currently support non-constant byte sizes for strings. */ - length = dwarf2_get_attr_constant_value (attr, 1); - } - else - { - /* Use 1 as a fallback length if we have nothing else. */ - length = 1; - } - - index_type = objfile_type (objfile)->builtin_int; - if (length_is_constant) - range_type = create_static_range_type (NULL, index_type, 1, length); - else - { - struct dynamic_prop low_bound; - - low_bound.kind = PROP_CONST; - low_bound.data.const_val = 1; - range_type = create_range_type (NULL, index_type, &low_bound, &prop, 0); - } - char_type = language_string_char_type (cu->language_defn, gdbarch); - type = create_string_type (NULL, char_type, range_type); - - return set_die_type (die, type, cu); -} - -/* Assuming that DIE corresponds to a function, returns nonzero - if the function is prototyped. */ - -static int -prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu) -{ - struct attribute *attr; - - attr = dwarf2_attr (die, DW_AT_prototyped, cu); - if (attr && (DW_UNSND (attr) != 0)) - return 1; - - /* The DWARF standard implies that the DW_AT_prototyped attribute - is only meaningful for C, but the concept also extends to other - languages that allow unprototyped functions (Eg: Objective C). - For all other languages, assume that functions are always - prototyped. */ - if (cu->language != language_c - && cu->language != language_objc - && cu->language != language_opencl) - return 1; - - /* RealView does not emit DW_AT_prototyped. We can not distinguish - prototyped and unprototyped functions; default to prototyped, - since that is more common in modern code (and RealView warns - about unprototyped functions). */ - if (producer_is_realview (cu->producer)) - return 1; - - return 0; -} - -/* Handle DIES due to C code like: - - struct foo - { - int (*funcp)(int a, long l); - int b; - }; - - ('funcp' generates a DW_TAG_subroutine_type DIE). */ - -static struct type * -read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu) -{ - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - struct type *type; /* Type that this function returns. */ - struct type *ftype; /* Function that returns above type. */ - struct attribute *attr; - - type = die_type (die, cu); - - /* The die_type call above may have already set the type for this DIE. */ - ftype = get_die_type (die, cu); - if (ftype) - return ftype; - - ftype = lookup_function_type (type); - - if (prototyped_function_p (die, cu)) - TYPE_PROTOTYPED (ftype) = 1; - - /* Store the calling convention in the type if it's available in - the subroutine die. Otherwise set the calling convention to - the default value DW_CC_normal. */ - attr = dwarf2_attr (die, DW_AT_calling_convention, cu); - if (attr != nullptr - && is_valid_DW_AT_calling_convention_for_subroutine (DW_UNSND (attr))) - TYPE_CALLING_CONVENTION (ftype) - = (enum dwarf_calling_convention) (DW_UNSND (attr)); - else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL")) - TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL; - else - TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal; - - /* Record whether the function returns normally to its caller or not - if the DWARF producer set that information. */ - attr = dwarf2_attr (die, DW_AT_noreturn, cu); - if (attr && (DW_UNSND (attr) != 0)) - TYPE_NO_RETURN (ftype) = 1; - - /* We need to add the subroutine type to the die immediately so - we don't infinitely recurse when dealing with parameters - declared as the same subroutine type. */ - set_die_type (die, ftype, cu); - - if (die->child != NULL) - { - struct type *void_type = objfile_type (objfile)->builtin_void; - struct die_info *child_die; - int nparams, iparams; - - /* Count the number of parameters. - FIXME: GDB currently ignores vararg functions, but knows about - vararg member functions. */ - nparams = 0; - child_die = die->child; - while (child_die && child_die->tag) - { - if (child_die->tag == DW_TAG_formal_parameter) - nparams++; - else if (child_die->tag == DW_TAG_unspecified_parameters) - TYPE_VARARGS (ftype) = 1; - child_die = sibling_die (child_die); - } - - /* Allocate storage for parameters and fill them in. */ - TYPE_NFIELDS (ftype) = nparams; - TYPE_FIELDS (ftype) = (struct field *) - TYPE_ZALLOC (ftype, nparams * sizeof (struct field)); - - /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it - even if we error out during the parameters reading below. */ - for (iparams = 0; iparams < nparams; iparams++) - TYPE_FIELD_TYPE (ftype, iparams) = void_type; - - iparams = 0; - child_die = die->child; - while (child_die && child_die->tag) - { - if (child_die->tag == DW_TAG_formal_parameter) - { - struct type *arg_type; - - /* DWARF version 2 has no clean way to discern C++ - static and non-static member functions. G++ helps - GDB by marking the first parameter for non-static - member functions (which is the this pointer) as - artificial. We pass this information to - dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL. - - DWARF version 3 added DW_AT_object_pointer, which GCC - 4.5 does not yet generate. */ - attr = dwarf2_attr (child_die, DW_AT_artificial, cu); - if (attr != nullptr) - TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr); - else - TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0; - arg_type = die_type (child_die, cu); - - /* RealView does not mark THIS as const, which the testsuite - expects. GCC marks THIS as const in method definitions, - but not in the class specifications (GCC PR 43053). */ - if (cu->language == language_cplus && !TYPE_CONST (arg_type) - && TYPE_FIELD_ARTIFICIAL (ftype, iparams)) - { - int is_this = 0; - struct dwarf2_cu *arg_cu = cu; - const char *name = dwarf2_name (child_die, cu); - - attr = dwarf2_attr (die, DW_AT_object_pointer, cu); - if (attr != nullptr) - { - /* If the compiler emits this, use it. */ - if (follow_die_ref (die, attr, &arg_cu) == child_die) - is_this = 1; - } - else if (name && strcmp (name, "this") == 0) - /* Function definitions will have the argument names. */ - is_this = 1; - else if (name == NULL && iparams == 0) - /* Declarations may not have the names, so like - elsewhere in GDB, assume an artificial first - argument is "this". */ - is_this = 1; - - if (is_this) - arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type), - arg_type, 0); - } - - TYPE_FIELD_TYPE (ftype, iparams) = arg_type; - iparams++; - } - child_die = sibling_die (child_die); - } - } - - return ftype; -} - -static struct type * -read_typedef (struct die_info *die, struct dwarf2_cu *cu) -{ - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - const char *name = NULL; - struct type *this_type, *target_type; - - name = dwarf2_full_name (NULL, die, cu); - this_type = init_type (objfile, TYPE_CODE_TYPEDEF, 0, name); - TYPE_TARGET_STUB (this_type) = 1; - set_die_type (die, this_type, cu); - target_type = die_type (die, cu); - if (target_type != this_type) - TYPE_TARGET_TYPE (this_type) = target_type; - else - { - /* Self-referential typedefs are, it seems, not allowed by the DWARF - spec and cause infinite loops in GDB. */ - complaint (_("Self-referential DW_TAG_typedef " - "- DIE at %s [in module %s]"), - sect_offset_str (die->sect_off), objfile_name (objfile)); - TYPE_TARGET_TYPE (this_type) = NULL; - } - return this_type; -} - -/* Allocate a floating-point type of size BITS and name NAME. Pass NAME_HINT - (which may be different from NAME) to the architecture back-end to allow - it to guess the correct format if necessary. */ - -static struct type * -dwarf2_init_float_type (struct objfile *objfile, int bits, const char *name, - const char *name_hint, enum bfd_endian byte_order) -{ - struct gdbarch *gdbarch = get_objfile_arch (objfile); - const struct floatformat **format; - struct type *type; - - format = gdbarch_floatformat_for_type (gdbarch, name_hint, bits); - if (format) - type = init_float_type (objfile, bits, name, format, byte_order); - else - type = init_type (objfile, TYPE_CODE_ERROR, bits, name); - - return type; -} - -/* Allocate an integer type of size BITS and name NAME. */ - -static struct type * -dwarf2_init_integer_type (struct dwarf2_cu *cu, struct objfile *objfile, - int bits, int unsigned_p, const char *name) -{ - struct type *type; - - /* Versions of Intel's C Compiler generate an integer type called "void" - instead of using DW_TAG_unspecified_type. This has been seen on - at least versions 14, 17, and 18. */ - if (bits == 0 && producer_is_icc (cu) && name != nullptr - && strcmp (name, "void") == 0) - type = objfile_type (objfile)->builtin_void; - else - type = init_integer_type (objfile, bits, unsigned_p, name); - - return type; -} - -/* Initialise and return a floating point type of size BITS suitable for - use as a component of a complex number. The NAME_HINT is passed through - when initialising the floating point type and is the name of the complex - type. - - As DWARF doesn't currently provide an explicit name for the components - of a complex number, but it can be helpful to have these components - named, we try to select a suitable name based on the size of the - component. */ -static struct type * -dwarf2_init_complex_target_type (struct dwarf2_cu *cu, - struct objfile *objfile, - int bits, const char *name_hint, - enum bfd_endian byte_order) -{ - gdbarch *gdbarch = get_objfile_arch (objfile); - struct type *tt = nullptr; - - /* Try to find a suitable floating point builtin type of size BITS. - We're going to use the name of this type as the name for the complex - target type that we are about to create. */ - switch (cu->language) - { - case language_fortran: - switch (bits) - { - case 32: - tt = builtin_f_type (gdbarch)->builtin_real; - break; - case 64: - tt = builtin_f_type (gdbarch)->builtin_real_s8; - break; - case 96: /* The x86-32 ABI specifies 96-bit long double. */ - case 128: - tt = builtin_f_type (gdbarch)->builtin_real_s16; - break; - } - break; - default: - switch (bits) - { - case 32: - tt = builtin_type (gdbarch)->builtin_float; - break; - case 64: - tt = builtin_type (gdbarch)->builtin_double; - break; - case 96: /* The x86-32 ABI specifies 96-bit long double. */ - case 128: - tt = builtin_type (gdbarch)->builtin_long_double; - break; - } - break; - } - - /* If the type we found doesn't match the size we were looking for, then - pretend we didn't find a type at all, the complex target type we - create will then be nameless. */ - if (tt != nullptr && TYPE_LENGTH (tt) * TARGET_CHAR_BIT != bits) - tt = nullptr; - - const char *name = (tt == nullptr) ? nullptr : TYPE_NAME (tt); - return dwarf2_init_float_type (objfile, bits, name, name_hint, byte_order); -} - -/* Find a representation of a given base type and install - it in the TYPE field of the die. */ - -static struct type * -read_base_type (struct die_info *die, struct dwarf2_cu *cu) -{ - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - struct type *type; - struct attribute *attr; - int encoding = 0, bits = 0; - const char *name; - gdbarch *arch; - - attr = dwarf2_attr (die, DW_AT_encoding, cu); - if (attr != nullptr) - encoding = DW_UNSND (attr); - attr = dwarf2_attr (die, DW_AT_byte_size, cu); - if (attr != nullptr) - bits = DW_UNSND (attr) * TARGET_CHAR_BIT; - name = dwarf2_name (die, cu); - if (!name) - complaint (_("DW_AT_name missing from DW_TAG_base_type")); - - arch = get_objfile_arch (objfile); - enum bfd_endian byte_order = gdbarch_byte_order (arch); - - attr = dwarf2_attr (die, DW_AT_endianity, cu); - if (attr) - { - int endianity = DW_UNSND (attr); - - switch (endianity) - { - case DW_END_big: - byte_order = BFD_ENDIAN_BIG; - break; - case DW_END_little: - byte_order = BFD_ENDIAN_LITTLE; - break; - default: - complaint (_("DW_AT_endianity has unrecognized value %d"), endianity); - break; - } - } - - switch (encoding) - { - case DW_ATE_address: - /* Turn DW_ATE_address into a void * pointer. */ - type = init_type (objfile, TYPE_CODE_VOID, TARGET_CHAR_BIT, NULL); - type = init_pointer_type (objfile, bits, name, type); - break; - case DW_ATE_boolean: - type = init_boolean_type (objfile, bits, 1, name); - break; - case DW_ATE_complex_float: - type = dwarf2_init_complex_target_type (cu, objfile, bits / 2, name, - byte_order); - type = init_complex_type (objfile, name, type); - break; - case DW_ATE_decimal_float: - type = init_decfloat_type (objfile, bits, name); - break; - case DW_ATE_float: - type = dwarf2_init_float_type (objfile, bits, name, name, byte_order); - break; - case DW_ATE_signed: - type = dwarf2_init_integer_type (cu, objfile, bits, 0, name); - break; - case DW_ATE_unsigned: - if (cu->language == language_fortran - && name - && startswith (name, "character(")) - type = init_character_type (objfile, bits, 1, name); - else - type = dwarf2_init_integer_type (cu, objfile, bits, 1, name); - break; - case DW_ATE_signed_char: - if (cu->language == language_ada || cu->language == language_m2 - || cu->language == language_pascal - || cu->language == language_fortran) - type = init_character_type (objfile, bits, 0, name); - else - type = dwarf2_init_integer_type (cu, objfile, bits, 0, name); - break; - case DW_ATE_unsigned_char: - if (cu->language == language_ada || cu->language == language_m2 - || cu->language == language_pascal - || cu->language == language_fortran - || cu->language == language_rust) - type = init_character_type (objfile, bits, 1, name); - else - type = dwarf2_init_integer_type (cu, objfile, bits, 1, name); - break; - case DW_ATE_UTF: - { - if (bits == 16) - type = builtin_type (arch)->builtin_char16; - else if (bits == 32) - type = builtin_type (arch)->builtin_char32; - else - { - complaint (_("unsupported DW_ATE_UTF bit size: '%d'"), - bits); - type = dwarf2_init_integer_type (cu, objfile, bits, 1, name); - } - return set_die_type (die, type, cu); - } - break; - - default: - complaint (_("unsupported DW_AT_encoding: '%s'"), - dwarf_type_encoding_name (encoding)); - type = init_type (objfile, TYPE_CODE_ERROR, bits, name); - break; - } - - if (name && strcmp (name, "char") == 0) - TYPE_NOSIGN (type) = 1; - - maybe_set_alignment (cu, die, type); - - TYPE_ENDIANITY_NOT_DEFAULT (type) = gdbarch_byte_order (arch) != byte_order; - - return set_die_type (die, type, cu); -} - -/* Parse dwarf attribute if it's a block, reference or constant and put the - resulting value of the attribute into struct bound_prop. - Returns 1 if ATTR could be resolved into PROP, 0 otherwise. */ - -static int -attr_to_dynamic_prop (const struct attribute *attr, struct die_info *die, - struct dwarf2_cu *cu, struct dynamic_prop *prop, - struct type *default_type) -{ - struct dwarf2_property_baton *baton; - struct obstack *obstack - = &cu->per_cu->dwarf2_per_objfile->objfile->objfile_obstack; - - gdb_assert (default_type != NULL); - - if (attr == NULL || prop == NULL) - return 0; - - if (attr->form_is_block ()) - { - baton = XOBNEW (obstack, struct dwarf2_property_baton); - baton->property_type = default_type; - baton->locexpr.per_cu = cu->per_cu; - baton->locexpr.size = DW_BLOCK (attr)->size; - baton->locexpr.data = DW_BLOCK (attr)->data; - switch (attr->name) - { - case DW_AT_string_length: - baton->locexpr.is_reference = true; - break; - default: - baton->locexpr.is_reference = false; - break; - } - prop->data.baton = baton; - prop->kind = PROP_LOCEXPR; - gdb_assert (prop->data.baton != NULL); - } - else if (attr->form_is_ref ()) - { - struct dwarf2_cu *target_cu = cu; - struct die_info *target_die; - struct attribute *target_attr; - - target_die = follow_die_ref (die, attr, &target_cu); - target_attr = dwarf2_attr (target_die, DW_AT_location, target_cu); - if (target_attr == NULL) - target_attr = dwarf2_attr (target_die, DW_AT_data_member_location, - target_cu); - if (target_attr == NULL) - return 0; - - switch (target_attr->name) - { - case DW_AT_location: - if (target_attr->form_is_section_offset ()) - { - baton = XOBNEW (obstack, struct dwarf2_property_baton); - baton->property_type = die_type (target_die, target_cu); - fill_in_loclist_baton (cu, &baton->loclist, target_attr); - prop->data.baton = baton; - prop->kind = PROP_LOCLIST; - gdb_assert (prop->data.baton != NULL); - } - else if (target_attr->form_is_block ()) - { - baton = XOBNEW (obstack, struct dwarf2_property_baton); - baton->property_type = die_type (target_die, target_cu); - baton->locexpr.per_cu = cu->per_cu; - baton->locexpr.size = DW_BLOCK (target_attr)->size; - baton->locexpr.data = DW_BLOCK (target_attr)->data; - baton->locexpr.is_reference = true; - prop->data.baton = baton; - prop->kind = PROP_LOCEXPR; - gdb_assert (prop->data.baton != NULL); - } - else - { - dwarf2_invalid_attrib_class_complaint ("DW_AT_location", - "dynamic property"); - return 0; - } - break; - case DW_AT_data_member_location: - { - LONGEST offset; - - if (!handle_data_member_location (target_die, target_cu, - &offset)) - return 0; - - baton = XOBNEW (obstack, struct dwarf2_property_baton); - baton->property_type = read_type_die (target_die->parent, - target_cu); - baton->offset_info.offset = offset; - baton->offset_info.type = die_type (target_die, target_cu); - prop->data.baton = baton; - prop->kind = PROP_ADDR_OFFSET; - break; - } - } - } - else if (attr->form_is_constant ()) - { - prop->data.const_val = dwarf2_get_attr_constant_value (attr, 0); - prop->kind = PROP_CONST; - } - else - { - dwarf2_invalid_attrib_class_complaint (dwarf_form_name (attr->form), - dwarf2_name (die, cu)); - return 0; - } - - return 1; -} - -/* Find an integer type SIZE_IN_BYTES bytes in size and return it. - UNSIGNED_P controls if the integer is unsigned or not. */ - -static struct type * -dwarf2_per_cu_int_type (struct dwarf2_per_cu_data *per_cu, - int size_in_bytes, bool unsigned_p) -{ - struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile; - struct type *int_type; - - /* Helper macro to examine the various builtin types. */ -#define TRY_TYPE(F) \ - int_type = (unsigned_p \ - ? objfile_type (objfile)->builtin_unsigned_ ## F \ - : objfile_type (objfile)->builtin_ ## F); \ - if (int_type != NULL && TYPE_LENGTH (int_type) == size_in_bytes) \ - return int_type - - TRY_TYPE (char); - TRY_TYPE (short); - TRY_TYPE (int); - TRY_TYPE (long); - TRY_TYPE (long_long); - -#undef TRY_TYPE - - gdb_assert_not_reached ("unable to find suitable integer type"); -} - -/* Find an integer type the same size as the address size given in the - compilation unit header for PER_CU. UNSIGNED_P controls if the integer - is unsigned or not. */ - -static struct type * -dwarf2_per_cu_addr_sized_int_type (struct dwarf2_per_cu_data *per_cu, - bool unsigned_p) -{ - int addr_size = dwarf2_per_cu_addr_size (per_cu); - return dwarf2_per_cu_int_type (per_cu, addr_size, unsigned_p); -} - -/* Read the DW_AT_type attribute for a sub-range. If this attribute is not - present (which is valid) then compute the default type based on the - compilation units address size. */ - -static struct type * -read_subrange_index_type (struct die_info *die, struct dwarf2_cu *cu) -{ - struct type *index_type = die_type (die, cu); - - /* Dwarf-2 specifications explicitly allows to create subrange types - without specifying a base type. - In that case, the base type must be set to the type of - the lower bound, upper bound or count, in that order, if any of these - three attributes references an object that has a type. - If no base type is found, the Dwarf-2 specifications say that - a signed integer type of size equal to the size of an address should - be used. - For the following C code: `extern char gdb_int [];' - GCC produces an empty range DIE. - FIXME: muller/2010-05-28: Possible references to object for low bound, - high bound or count are not yet handled by this code. */ - if (TYPE_CODE (index_type) == TYPE_CODE_VOID) - index_type = dwarf2_per_cu_addr_sized_int_type (cu->per_cu, false); - - return index_type; -} - -/* Read the given DW_AT_subrange DIE. */ - -static struct type * -read_subrange_type (struct die_info *die, struct dwarf2_cu *cu) -{ - struct type *base_type, *orig_base_type; - struct type *range_type; - struct attribute *attr; - struct dynamic_prop low, high; - int low_default_is_valid; - int high_bound_is_count = 0; - const char *name; - ULONGEST negative_mask; - - orig_base_type = read_subrange_index_type (die, cu); - - /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED, - whereas the real type might be. So, we use ORIG_BASE_TYPE when - creating the range type, but we use the result of check_typedef - when examining properties of the type. */ - base_type = check_typedef (orig_base_type); - - /* The die_type call above may have already set the type for this DIE. */ - range_type = get_die_type (die, cu); - if (range_type) - return range_type; - - low.kind = PROP_CONST; - high.kind = PROP_CONST; - high.data.const_val = 0; - - /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow - omitting DW_AT_lower_bound. */ - switch (cu->language) - { - case language_c: - case language_cplus: - low.data.const_val = 0; - low_default_is_valid = 1; - break; - case language_fortran: - low.data.const_val = 1; - low_default_is_valid = 1; - break; - case language_d: - case language_objc: - case language_rust: - low.data.const_val = 0; - low_default_is_valid = (cu->header.version >= 4); - break; - case language_ada: - case language_m2: - case language_pascal: - low.data.const_val = 1; - low_default_is_valid = (cu->header.version >= 4); - break; - default: - low.data.const_val = 0; - low_default_is_valid = 0; - break; - } - - attr = dwarf2_attr (die, DW_AT_lower_bound, cu); - if (attr != nullptr) - attr_to_dynamic_prop (attr, die, cu, &low, base_type); - else if (!low_default_is_valid) - complaint (_("Missing DW_AT_lower_bound " - "- DIE at %s [in module %s]"), - sect_offset_str (die->sect_off), - objfile_name (cu->per_cu->dwarf2_per_objfile->objfile)); - - struct attribute *attr_ub, *attr_count; - attr = attr_ub = dwarf2_attr (die, DW_AT_upper_bound, cu); - if (!attr_to_dynamic_prop (attr, die, cu, &high, base_type)) - { - attr = attr_count = dwarf2_attr (die, DW_AT_count, cu); - if (attr_to_dynamic_prop (attr, die, cu, &high, base_type)) - { - /* If bounds are constant do the final calculation here. */ - if (low.kind == PROP_CONST && high.kind == PROP_CONST) - high.data.const_val = low.data.const_val + high.data.const_val - 1; - else - high_bound_is_count = 1; - } - else - { - if (attr_ub != NULL) - complaint (_("Unresolved DW_AT_upper_bound " - "- DIE at %s [in module %s]"), - sect_offset_str (die->sect_off), - objfile_name (cu->per_cu->dwarf2_per_objfile->objfile)); - if (attr_count != NULL) - complaint (_("Unresolved DW_AT_count " - "- DIE at %s [in module %s]"), - sect_offset_str (die->sect_off), - objfile_name (cu->per_cu->dwarf2_per_objfile->objfile)); - } - } - - LONGEST bias = 0; - struct attribute *bias_attr = dwarf2_attr (die, DW_AT_GNU_bias, cu); - if (bias_attr != nullptr && bias_attr->form_is_constant ()) - bias = dwarf2_get_attr_constant_value (bias_attr, 0); - - /* Normally, the DWARF producers are expected to use a signed - constant form (Eg. DW_FORM_sdata) to express negative bounds. - But this is unfortunately not always the case, as witnessed - with GCC, for instance, where the ambiguous DW_FORM_dataN form - is used instead. To work around that ambiguity, we treat - the bounds as signed, and thus sign-extend their values, when - the base type is signed. */ - negative_mask = - -((ULONGEST) 1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1)); - if (low.kind == PROP_CONST - && !TYPE_UNSIGNED (base_type) && (low.data.const_val & negative_mask)) - low.data.const_val |= negative_mask; - if (high.kind == PROP_CONST - && !TYPE_UNSIGNED (base_type) && (high.data.const_val & negative_mask)) - high.data.const_val |= negative_mask; - - /* Check for bit and byte strides. */ - struct dynamic_prop byte_stride_prop; - attribute *attr_byte_stride = dwarf2_attr (die, DW_AT_byte_stride, cu); - if (attr_byte_stride != nullptr) - { - struct type *prop_type - = dwarf2_per_cu_addr_sized_int_type (cu->per_cu, false); - attr_to_dynamic_prop (attr_byte_stride, die, cu, &byte_stride_prop, - prop_type); - } - - struct dynamic_prop bit_stride_prop; - attribute *attr_bit_stride = dwarf2_attr (die, DW_AT_bit_stride, cu); - if (attr_bit_stride != nullptr) - { - /* It only makes sense to have either a bit or byte stride. */ - if (attr_byte_stride != nullptr) - { - complaint (_("Found DW_AT_bit_stride and DW_AT_byte_stride " - "- DIE at %s [in module %s]"), - sect_offset_str (die->sect_off), - objfile_name (cu->per_cu->dwarf2_per_objfile->objfile)); - attr_bit_stride = nullptr; - } - else - { - struct type *prop_type - = dwarf2_per_cu_addr_sized_int_type (cu->per_cu, false); - attr_to_dynamic_prop (attr_bit_stride, die, cu, &bit_stride_prop, - prop_type); - } - } - - if (attr_byte_stride != nullptr - || attr_bit_stride != nullptr) - { - bool byte_stride_p = (attr_byte_stride != nullptr); - struct dynamic_prop *stride - = byte_stride_p ? &byte_stride_prop : &bit_stride_prop; - - range_type - = create_range_type_with_stride (NULL, orig_base_type, &low, - &high, bias, stride, byte_stride_p); - } - else - range_type = create_range_type (NULL, orig_base_type, &low, &high, bias); - - if (high_bound_is_count) - TYPE_RANGE_DATA (range_type)->flag_upper_bound_is_count = 1; - - /* Ada expects an empty array on no boundary attributes. */ - if (attr == NULL && cu->language != language_ada) - TYPE_HIGH_BOUND_KIND (range_type) = PROP_UNDEFINED; - - name = dwarf2_name (die, cu); - if (name) - TYPE_NAME (range_type) = name; - - attr = dwarf2_attr (die, DW_AT_byte_size, cu); - if (attr != nullptr) - TYPE_LENGTH (range_type) = DW_UNSND (attr); - - maybe_set_alignment (cu, die, range_type); - - set_die_type (die, range_type, cu); - - /* set_die_type should be already done. */ - set_descriptive_type (range_type, die, cu); - - return range_type; -} - -static struct type * -read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu) -{ - struct type *type; - - type = init_type (cu->per_cu->dwarf2_per_objfile->objfile, TYPE_CODE_VOID,0, - NULL); - TYPE_NAME (type) = dwarf2_name (die, cu); - - /* In Ada, an unspecified type is typically used when the description - of the type is deferred to a different unit. When encountering - such a type, we treat it as a stub, and try to resolve it later on, - when needed. */ - if (cu->language == language_ada) - TYPE_STUB (type) = 1; - - return set_die_type (die, type, cu); -} - -/* Read a single die and all its descendents. Set the die's sibling - field to NULL; set other fields in the die correctly, and set all - of the descendents' fields correctly. Set *NEW_INFO_PTR to the - location of the info_ptr after reading all of those dies. PARENT - is the parent of the die in question. */ - -static struct die_info * -read_die_and_children (const struct die_reader_specs *reader, - const gdb_byte *info_ptr, - const gdb_byte **new_info_ptr, - struct die_info *parent) -{ - struct die_info *die; - const gdb_byte *cur_ptr; - int has_children; - - cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0); - if (die == NULL) - { - *new_info_ptr = cur_ptr; - return NULL; - } - store_in_ref_table (die, reader->cu); - - if (has_children) - die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die); - else - { - die->child = NULL; - *new_info_ptr = cur_ptr; - } - - die->sibling = NULL; - die->parent = parent; - return die; -} - -/* Read a die, all of its descendents, and all of its siblings; set - all of the fields of all of the dies correctly. Arguments are as - in read_die_and_children. */ - -static struct die_info * -read_die_and_siblings_1 (const struct die_reader_specs *reader, - const gdb_byte *info_ptr, - const gdb_byte **new_info_ptr, - struct die_info *parent) -{ - struct die_info *first_die, *last_sibling; - const gdb_byte *cur_ptr; - - cur_ptr = info_ptr; - first_die = last_sibling = NULL; - - while (1) - { - struct die_info *die - = read_die_and_children (reader, cur_ptr, &cur_ptr, parent); - - if (die == NULL) - { - *new_info_ptr = cur_ptr; - return first_die; - } - - if (!first_die) - first_die = die; - else - last_sibling->sibling = die; - - last_sibling = die; - } -} - -/* Read a die, all of its descendents, and all of its siblings; set - all of the fields of all of the dies correctly. Arguments are as - in read_die_and_children. - This the main entry point for reading a DIE and all its children. */ - -static struct die_info * -read_die_and_siblings (const struct die_reader_specs *reader, - const gdb_byte *info_ptr, - const gdb_byte **new_info_ptr, - struct die_info *parent) -{ - struct die_info *die = read_die_and_siblings_1 (reader, info_ptr, - new_info_ptr, parent); - - if (dwarf_die_debug) - { - fprintf_unfiltered (gdb_stdlog, - "Read die from %s@0x%x of %s:\n", - reader->die_section->get_name (), - (unsigned) (info_ptr - reader->die_section->buffer), - bfd_get_filename (reader->abfd)); - dump_die (die, dwarf_die_debug); - } - - return die; -} - -/* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS - attributes. - The caller is responsible for filling in the extra attributes - and updating (*DIEP)->num_attrs. - Set DIEP to point to a newly allocated die with its information, - except for its child, sibling, and parent fields. - Set HAS_CHILDREN to tell whether the die has children or not. */ - -static const gdb_byte * -read_full_die_1 (const struct die_reader_specs *reader, - struct die_info **diep, const gdb_byte *info_ptr, - int *has_children, int num_extra_attrs) -{ - unsigned int abbrev_number, bytes_read, i; - struct abbrev_info *abbrev; - struct die_info *die; - struct dwarf2_cu *cu = reader->cu; - bfd *abfd = reader->abfd; - - sect_offset sect_off = (sect_offset) (info_ptr - reader->buffer); - abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); - info_ptr += bytes_read; - if (!abbrev_number) - { - *diep = NULL; - *has_children = 0; - return info_ptr; - } - - abbrev = reader->abbrev_table->lookup_abbrev (abbrev_number); - if (!abbrev) - error (_("Dwarf Error: could not find abbrev number %d [in module %s]"), - abbrev_number, - bfd_get_filename (abfd)); - - die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs); - die->sect_off = sect_off; - die->tag = abbrev->tag; - die->abbrev = abbrev_number; - - /* Make the result usable. - The caller needs to update num_attrs after adding the extra - attributes. */ - die->num_attrs = abbrev->num_attrs; - - std::vector<int> indexes_that_need_reprocess; - for (i = 0; i < abbrev->num_attrs; ++i) - { - bool need_reprocess; - info_ptr = - read_attribute (reader, &die->attrs[i], &abbrev->attrs[i], - info_ptr, &need_reprocess); - if (need_reprocess) - indexes_that_need_reprocess.push_back (i); - } - - struct attribute *attr = dwarf2_attr_no_follow (die, DW_AT_str_offsets_base); - if (attr != nullptr) - cu->str_offsets_base = DW_UNSND (attr); - - auto maybe_addr_base = lookup_addr_base(die); - if (maybe_addr_base.has_value ()) - cu->addr_base = *maybe_addr_base; - for (int index : indexes_that_need_reprocess) - read_attribute_reprocess (reader, &die->attrs[index]); - *diep = die; - *has_children = abbrev->has_children; - return info_ptr; -} - -/* Read a die and all its attributes. - Set DIEP to point to a newly allocated die with its information, - except for its child, sibling, and parent fields. - Set HAS_CHILDREN to tell whether the die has children or not. */ - -static const gdb_byte * -read_full_die (const struct die_reader_specs *reader, - struct die_info **diep, const gdb_byte *info_ptr, - int *has_children) -{ - const gdb_byte *result; - - result = read_full_die_1 (reader, diep, info_ptr, has_children, 0); - - if (dwarf_die_debug) - { - fprintf_unfiltered (gdb_stdlog, - "Read die from %s@0x%x of %s:\n", - reader->die_section->get_name (), - (unsigned) (info_ptr - reader->die_section->buffer), - bfd_get_filename (reader->abfd)); - dump_die (*diep, dwarf_die_debug); - } - - return result; -} - - -/* Returns nonzero if TAG represents a type that we might generate a partial - symbol for. */ - -static int -is_type_tag_for_partial (int tag) -{ - switch (tag) - { -#if 0 - /* Some types that would be reasonable to generate partial symbols for, - that we don't at present. */ - case DW_TAG_array_type: - case DW_TAG_file_type: - case DW_TAG_ptr_to_member_type: - case DW_TAG_set_type: - case DW_TAG_string_type: - case DW_TAG_subroutine_type: -#endif - case DW_TAG_base_type: - case DW_TAG_class_type: - case DW_TAG_interface_type: - case DW_TAG_enumeration_type: - case DW_TAG_structure_type: - case DW_TAG_subrange_type: - case DW_TAG_typedef: - case DW_TAG_union_type: - return 1; - default: - return 0; - } -} - -/* Load all DIEs that are interesting for partial symbols into memory. */ - -static struct partial_die_info * -load_partial_dies (const struct die_reader_specs *reader, - const gdb_byte *info_ptr, int building_psymtab) -{ - struct dwarf2_cu *cu = reader->cu; - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - struct partial_die_info *parent_die, *last_die, *first_die = NULL; - unsigned int bytes_read; - unsigned int load_all = 0; - int nesting_level = 1; - - parent_die = NULL; - last_die = NULL; - - gdb_assert (cu->per_cu != NULL); - if (cu->per_cu->load_all_dies) - load_all = 1; - - cu->partial_dies - = htab_create_alloc_ex (cu->header.length / 12, - partial_die_hash, - partial_die_eq, - NULL, - &cu->comp_unit_obstack, - hashtab_obstack_allocate, - dummy_obstack_deallocate); - - while (1) - { - abbrev_info *abbrev = peek_die_abbrev (*reader, info_ptr, &bytes_read); - - /* A NULL abbrev means the end of a series of children. */ - if (abbrev == NULL) - { - if (--nesting_level == 0) - return first_die; - - info_ptr += bytes_read; - last_die = parent_die; - parent_die = parent_die->die_parent; - continue; - } - - /* Check for template arguments. We never save these; if - they're seen, we just mark the parent, and go on our way. */ - if (parent_die != NULL - && cu->language == language_cplus - && (abbrev->tag == DW_TAG_template_type_param - || abbrev->tag == DW_TAG_template_value_param)) - { - parent_die->has_template_arguments = 1; - - if (!load_all) - { - /* We don't need a partial DIE for the template argument. */ - info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev); - continue; - } - } - - /* We only recurse into c++ subprograms looking for template arguments. - Skip their other children. */ - if (!load_all - && cu->language == language_cplus - && parent_die != NULL - && parent_die->tag == DW_TAG_subprogram) - { - info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev); - continue; - } - - /* Check whether this DIE is interesting enough to save. Normally - we would not be interested in members here, but there may be - later variables referencing them via DW_AT_specification (for - static members). */ - if (!load_all - && !is_type_tag_for_partial (abbrev->tag) - && abbrev->tag != DW_TAG_constant - && abbrev->tag != DW_TAG_enumerator - && abbrev->tag != DW_TAG_subprogram - && abbrev->tag != DW_TAG_inlined_subroutine - && abbrev->tag != DW_TAG_lexical_block - && abbrev->tag != DW_TAG_variable - && abbrev->tag != DW_TAG_namespace - && abbrev->tag != DW_TAG_module - && abbrev->tag != DW_TAG_member - && abbrev->tag != DW_TAG_imported_unit - && abbrev->tag != DW_TAG_imported_declaration) - { - /* Otherwise we skip to the next sibling, if any. */ - info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev); - continue; - } - - struct partial_die_info pdi ((sect_offset) (info_ptr - reader->buffer), - abbrev); - - info_ptr = pdi.read (reader, *abbrev, info_ptr + bytes_read); - - /* This two-pass algorithm for processing partial symbols has a - high cost in cache pressure. Thus, handle some simple cases - here which cover the majority of C partial symbols. DIEs - which neither have specification tags in them, nor could have - specification tags elsewhere pointing at them, can simply be - processed and discarded. - - This segment is also optional; scan_partial_symbols and - add_partial_symbol will handle these DIEs if we chain - them in normally. When compilers which do not emit large - quantities of duplicate debug information are more common, - this code can probably be removed. */ - - /* Any complete simple types at the top level (pretty much all - of them, for a language without namespaces), can be processed - directly. */ - if (parent_die == NULL - && pdi.has_specification == 0 - && pdi.is_declaration == 0 - && ((pdi.tag == DW_TAG_typedef && !pdi.has_children) - || pdi.tag == DW_TAG_base_type - || pdi.tag == DW_TAG_subrange_type)) - { - if (building_psymtab && pdi.name != NULL) - add_psymbol_to_list (pdi.name, false, - VAR_DOMAIN, LOC_TYPEDEF, -1, - psymbol_placement::STATIC, - 0, cu->language, objfile); - info_ptr = locate_pdi_sibling (reader, &pdi, info_ptr); - continue; - } - - /* The exception for DW_TAG_typedef with has_children above is - a workaround of GCC PR debug/47510. In the case of this complaint - type_name_or_error will error on such types later. - - GDB skipped children of DW_TAG_typedef by the shortcut above and then - it could not find the child DIEs referenced later, this is checked - above. In correct DWARF DW_TAG_typedef should have no children. */ - - if (pdi.tag == DW_TAG_typedef && pdi.has_children) - complaint (_("DW_TAG_typedef has childen - GCC PR debug/47510 bug " - "- DIE at %s [in module %s]"), - sect_offset_str (pdi.sect_off), objfile_name (objfile)); - - /* If we're at the second level, and we're an enumerator, and - our parent has no specification (meaning possibly lives in a - namespace elsewhere), then we can add the partial symbol now - instead of queueing it. */ - if (pdi.tag == DW_TAG_enumerator - && parent_die != NULL - && parent_die->die_parent == NULL - && parent_die->tag == DW_TAG_enumeration_type - && parent_die->has_specification == 0) - { - if (pdi.name == NULL) - complaint (_("malformed enumerator DIE ignored")); - else if (building_psymtab) - add_psymbol_to_list (pdi.name, false, - VAR_DOMAIN, LOC_CONST, -1, - cu->language == language_cplus - ? psymbol_placement::GLOBAL - : psymbol_placement::STATIC, - 0, cu->language, objfile); - - info_ptr = locate_pdi_sibling (reader, &pdi, info_ptr); - continue; - } - - struct partial_die_info *part_die - = new (&cu->comp_unit_obstack) partial_die_info (pdi); - - /* We'll save this DIE so link it in. */ - part_die->die_parent = parent_die; - part_die->die_sibling = NULL; - part_die->die_child = NULL; - - if (last_die && last_die == parent_die) - last_die->die_child = part_die; - else if (last_die) - last_die->die_sibling = part_die; - - last_die = part_die; - - if (first_die == NULL) - first_die = part_die; - - /* Maybe add the DIE to the hash table. Not all DIEs that we - find interesting need to be in the hash table, because we - also have the parent/sibling/child chains; only those that we - might refer to by offset later during partial symbol reading. - - For now this means things that might have be the target of a - DW_AT_specification, DW_AT_abstract_origin, or - DW_AT_extension. DW_AT_extension will refer only to - namespaces; DW_AT_abstract_origin refers to functions (and - many things under the function DIE, but we do not recurse - into function DIEs during partial symbol reading) and - possibly variables as well; DW_AT_specification refers to - declarations. Declarations ought to have the DW_AT_declaration - flag. It happens that GCC forgets to put it in sometimes, but - only for functions, not for types. - - Adding more things than necessary to the hash table is harmless - except for the performance cost. Adding too few will result in - wasted time in find_partial_die, when we reread the compilation - unit with load_all_dies set. */ - - if (load_all - || abbrev->tag == DW_TAG_constant - || abbrev->tag == DW_TAG_subprogram - || abbrev->tag == DW_TAG_variable - || abbrev->tag == DW_TAG_namespace - || part_die->is_declaration) - { - void **slot; - - slot = htab_find_slot_with_hash (cu->partial_dies, part_die, - to_underlying (part_die->sect_off), - INSERT); - *slot = part_die; - } - - /* For some DIEs we want to follow their children (if any). For C - we have no reason to follow the children of structures; for other - languages we have to, so that we can get at method physnames - to infer fully qualified class names, for DW_AT_specification, - and for C++ template arguments. For C++, we also look one level - inside functions to find template arguments (if the name of the - function does not already contain the template arguments). - - For Ada and Fortran, we need to scan the children of subprograms - and lexical blocks as well because these languages allow the - definition of nested entities that could be interesting for the - debugger, such as nested subprograms for instance. */ - if (last_die->has_children - && (load_all - || last_die->tag == DW_TAG_namespace - || last_die->tag == DW_TAG_module - || last_die->tag == DW_TAG_enumeration_type - || (cu->language == language_cplus - && last_die->tag == DW_TAG_subprogram - && (last_die->name == NULL - || strchr (last_die->name, '<') == NULL)) - || (cu->language != language_c - && (last_die->tag == DW_TAG_class_type - || last_die->tag == DW_TAG_interface_type - || last_die->tag == DW_TAG_structure_type - || last_die->tag == DW_TAG_union_type)) - || ((cu->language == language_ada - || cu->language == language_fortran) - && (last_die->tag == DW_TAG_subprogram - || last_die->tag == DW_TAG_lexical_block)))) - { - nesting_level++; - parent_die = last_die; - continue; - } - - /* Otherwise we skip to the next sibling, if any. */ - info_ptr = locate_pdi_sibling (reader, last_die, info_ptr); - - /* Back to the top, do it again. */ - } -} - -partial_die_info::partial_die_info (sect_offset sect_off_, - struct abbrev_info *abbrev) - : partial_die_info (sect_off_, abbrev->tag, abbrev->has_children) -{ -} - -/* Read a minimal amount of information into the minimal die structure. - INFO_PTR should point just after the initial uleb128 of a DIE. */ - -const gdb_byte * -partial_die_info::read (const struct die_reader_specs *reader, - const struct abbrev_info &abbrev, const gdb_byte *info_ptr) -{ - struct dwarf2_cu *cu = reader->cu; - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - unsigned int i; - int has_low_pc_attr = 0; - int has_high_pc_attr = 0; - int high_pc_relative = 0; - - std::vector<struct attribute> attr_vec (abbrev.num_attrs); - for (i = 0; i < abbrev.num_attrs; ++i) - { - bool need_reprocess; - info_ptr = read_attribute (reader, &attr_vec[i], &abbrev.attrs[i], - info_ptr, &need_reprocess); - /* String and address offsets that need to do the reprocessing have - already been read at this point, so there is no need to wait until - the loop terminates to do the reprocessing. */ - if (need_reprocess) - read_attribute_reprocess (reader, &attr_vec[i]); - attribute &attr = attr_vec[i]; - /* Store the data if it is of an attribute we want to keep in a - partial symbol table. */ - switch (attr.name) - { - case DW_AT_name: - switch (tag) - { - case DW_TAG_compile_unit: - case DW_TAG_partial_unit: - case DW_TAG_type_unit: - /* Compilation units have a DW_AT_name that is a filename, not - a source language identifier. */ - case DW_TAG_enumeration_type: - case DW_TAG_enumerator: - /* These tags always have simple identifiers already; no need - to canonicalize them. */ - name = DW_STRING (&attr); - break; - default: - { - struct objfile *objfile = dwarf2_per_objfile->objfile; - - name - = dwarf2_canonicalize_name (DW_STRING (&attr), cu, - &objfile->per_bfd->storage_obstack); - } - break; - } - break; - case DW_AT_linkage_name: - case DW_AT_MIPS_linkage_name: - /* Note that both forms of linkage name might appear. We - assume they will be the same, and we only store the last - one we see. */ - linkage_name = DW_STRING (&attr); - break; - case DW_AT_low_pc: - has_low_pc_attr = 1; - lowpc = attr.value_as_address (); - break; - case DW_AT_high_pc: - has_high_pc_attr = 1; - highpc = attr.value_as_address (); - if (cu->header.version >= 4 && attr.form_is_constant ()) - high_pc_relative = 1; - break; - case DW_AT_location: - /* Support the .debug_loc offsets. */ - if (attr.form_is_block ()) - { - d.locdesc = DW_BLOCK (&attr); - } - else if (attr.form_is_section_offset ()) - { - dwarf2_complex_location_expr_complaint (); - } - else - { - dwarf2_invalid_attrib_class_complaint ("DW_AT_location", - "partial symbol information"); - } - break; - case DW_AT_external: - is_external = DW_UNSND (&attr); - break; - case DW_AT_declaration: - is_declaration = DW_UNSND (&attr); - break; - case DW_AT_type: - has_type = 1; - break; - case DW_AT_abstract_origin: - case DW_AT_specification: - case DW_AT_extension: - has_specification = 1; - spec_offset = dwarf2_get_ref_die_offset (&attr); - spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt - || cu->per_cu->is_dwz); - break; - case DW_AT_sibling: - /* Ignore absolute siblings, they might point outside of - the current compile unit. */ - if (attr.form == DW_FORM_ref_addr) - complaint (_("ignoring absolute DW_AT_sibling")); - else - { - const gdb_byte *buffer = reader->buffer; - sect_offset off = dwarf2_get_ref_die_offset (&attr); - const gdb_byte *sibling_ptr = buffer + to_underlying (off); - - if (sibling_ptr < info_ptr) - complaint (_("DW_AT_sibling points backwards")); - else if (sibling_ptr > reader->buffer_end) - dwarf2_section_buffer_overflow_complaint (reader->die_section); - else - sibling = sibling_ptr; - } - break; - case DW_AT_byte_size: - has_byte_size = 1; - break; - case DW_AT_const_value: - has_const_value = 1; - break; - case DW_AT_calling_convention: - /* DWARF doesn't provide a way to identify a program's source-level - entry point. DW_AT_calling_convention attributes are only meant - to describe functions' calling conventions. - - However, because it's a necessary piece of information in - Fortran, and before DWARF 4 DW_CC_program was the only - piece of debugging information whose definition refers to - a 'main program' at all, several compilers marked Fortran - main programs with DW_CC_program --- even when those - functions use the standard calling conventions. - - Although DWARF now specifies a way to provide this - information, we support this practice for backward - compatibility. */ - if (DW_UNSND (&attr) == DW_CC_program - && cu->language == language_fortran) - main_subprogram = 1; - break; - case DW_AT_inline: - if (DW_UNSND (&attr) == DW_INL_inlined - || DW_UNSND (&attr) == DW_INL_declared_inlined) - may_be_inlined = 1; - break; - - case DW_AT_import: - if (tag == DW_TAG_imported_unit) - { - d.sect_off = dwarf2_get_ref_die_offset (&attr); - is_dwz = (attr.form == DW_FORM_GNU_ref_alt - || cu->per_cu->is_dwz); - } - break; - - case DW_AT_main_subprogram: - main_subprogram = DW_UNSND (&attr); - break; - - case DW_AT_ranges: - { - /* It would be nice to reuse dwarf2_get_pc_bounds here, - but that requires a full DIE, so instead we just - reimplement it. */ - int need_ranges_base = tag != DW_TAG_compile_unit; - unsigned int ranges_offset = (DW_UNSND (&attr) - + (need_ranges_base - ? cu->ranges_base - : 0)); - - /* Value of the DW_AT_ranges attribute is the offset in the - .debug_ranges section. */ - if (dwarf2_ranges_read (ranges_offset, &lowpc, &highpc, cu, - nullptr)) - has_pc_info = 1; - } - break; - - default: - break; - } - } - - /* For Ada, if both the name and the linkage name appear, we prefer - the latter. This lets "catch exception" work better, regardless - of the order in which the name and linkage name were emitted. - Really, though, this is just a workaround for the fact that gdb - doesn't store both the name and the linkage name. */ - if (cu->language == language_ada && linkage_name != nullptr) - name = linkage_name; - - if (high_pc_relative) - highpc += lowpc; - - if (has_low_pc_attr && has_high_pc_attr) - { - /* When using the GNU linker, .gnu.linkonce. sections are used to - eliminate duplicate copies of functions and vtables and such. - The linker will arbitrarily choose one and discard the others. - The AT_*_pc values for such functions refer to local labels in - these sections. If the section from that file was discarded, the - labels are not in the output, so the relocs get a value of 0. - If this is a discarded function, mark the pc bounds as invalid, - so that GDB will ignore it. */ - if (lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero) - { - struct objfile *objfile = dwarf2_per_objfile->objfile; - struct gdbarch *gdbarch = get_objfile_arch (objfile); - - complaint (_("DW_AT_low_pc %s is zero " - "for DIE at %s [in module %s]"), - paddress (gdbarch, lowpc), - sect_offset_str (sect_off), - objfile_name (objfile)); - } - /* dwarf2_get_pc_bounds has also the strict low < high requirement. */ - else if (lowpc >= highpc) - { - struct objfile *objfile = dwarf2_per_objfile->objfile; - struct gdbarch *gdbarch = get_objfile_arch (objfile); - - complaint (_("DW_AT_low_pc %s is not < DW_AT_high_pc %s " - "for DIE at %s [in module %s]"), - paddress (gdbarch, lowpc), - paddress (gdbarch, highpc), - sect_offset_str (sect_off), - objfile_name (objfile)); - } - else - has_pc_info = 1; - } - - return info_ptr; -} - -/* Find a cached partial DIE at OFFSET in CU. */ - -struct partial_die_info * -dwarf2_cu::find_partial_die (sect_offset sect_off) -{ - struct partial_die_info *lookup_die = NULL; - struct partial_die_info part_die (sect_off); - - lookup_die = ((struct partial_die_info *) - htab_find_with_hash (partial_dies, &part_die, - to_underlying (sect_off))); - - return lookup_die; -} - -/* Find a partial DIE at OFFSET, which may or may not be in CU, - except in the case of .debug_types DIEs which do not reference - outside their CU (they do however referencing other types via - DW_FORM_ref_sig8). */ - -static const struct cu_partial_die_info -find_partial_die (sect_offset sect_off, int offset_in_dwz, struct dwarf2_cu *cu) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - struct objfile *objfile = dwarf2_per_objfile->objfile; - struct dwarf2_per_cu_data *per_cu = NULL; - struct partial_die_info *pd = NULL; - - if (offset_in_dwz == cu->per_cu->is_dwz - && offset_in_cu_p (&cu->header, sect_off)) - { - pd = cu->find_partial_die (sect_off); - if (pd != NULL) - return { cu, pd }; - /* We missed recording what we needed. - Load all dies and try again. */ - per_cu = cu->per_cu; - } - else - { - /* TUs don't reference other CUs/TUs (except via type signatures). */ - if (cu->per_cu->is_debug_types) - { - error (_("Dwarf Error: Type Unit at offset %s contains" - " external reference to offset %s [in module %s].\n"), - sect_offset_str (cu->header.sect_off), sect_offset_str (sect_off), - bfd_get_filename (objfile->obfd)); - } - per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz, - dwarf2_per_objfile); - - if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL) - load_partial_comp_unit (per_cu); - - per_cu->cu->last_used = 0; - pd = per_cu->cu->find_partial_die (sect_off); - } - - /* If we didn't find it, and not all dies have been loaded, - load them all and try again. */ - - if (pd == NULL && per_cu->load_all_dies == 0) - { - per_cu->load_all_dies = 1; - - /* This is nasty. When we reread the DIEs, somewhere up the call chain - THIS_CU->cu may already be in use. So we can't just free it and - replace its DIEs with the ones we read in. Instead, we leave those - DIEs alone (which can still be in use, e.g. in scan_partial_symbols), - and clobber THIS_CU->cu->partial_dies with the hash table for the new - set. */ - load_partial_comp_unit (per_cu); - - pd = per_cu->cu->find_partial_die (sect_off); - } - - if (pd == NULL) - internal_error (__FILE__, __LINE__, - _("could not find partial DIE %s " - "in cache [from module %s]\n"), - sect_offset_str (sect_off), bfd_get_filename (objfile->obfd)); - return { per_cu->cu, pd }; -} - -/* See if we can figure out if the class lives in a namespace. We do - this by looking for a member function; its demangled name will - contain namespace info, if there is any. */ - -static void -guess_partial_die_structure_name (struct partial_die_info *struct_pdi, - struct dwarf2_cu *cu) -{ - /* NOTE: carlton/2003-10-07: Getting the info this way changes - what template types look like, because the demangler - frequently doesn't give the same name as the debug info. We - could fix this by only using the demangled name to get the - prefix (but see comment in read_structure_type). */ - - struct partial_die_info *real_pdi; - struct partial_die_info *child_pdi; - - /* If this DIE (this DIE's specification, if any) has a parent, then - we should not do this. We'll prepend the parent's fully qualified - name when we create the partial symbol. */ - - real_pdi = struct_pdi; - while (real_pdi->has_specification) - { - auto res = find_partial_die (real_pdi->spec_offset, - real_pdi->spec_is_dwz, cu); - real_pdi = res.pdi; - cu = res.cu; - } - - if (real_pdi->die_parent != NULL) - return; - - for (child_pdi = struct_pdi->die_child; - child_pdi != NULL; - child_pdi = child_pdi->die_sibling) - { - if (child_pdi->tag == DW_TAG_subprogram - && child_pdi->linkage_name != NULL) - { - gdb::unique_xmalloc_ptr<char> actual_class_name - (language_class_name_from_physname (cu->language_defn, - child_pdi->linkage_name)); - if (actual_class_name != NULL) - { - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - struct_pdi->name - = obstack_strdup (&objfile->per_bfd->storage_obstack, - actual_class_name.get ()); - } - break; - } - } -} - -void -partial_die_info::fixup (struct dwarf2_cu *cu) -{ - /* Once we've fixed up a die, there's no point in doing so again. - This also avoids a memory leak if we were to call - guess_partial_die_structure_name multiple times. */ - if (fixup_called) - return; - - /* If we found a reference attribute and the DIE has no name, try - to find a name in the referred to DIE. */ - - if (name == NULL && has_specification) - { - struct partial_die_info *spec_die; - - auto res = find_partial_die (spec_offset, spec_is_dwz, cu); - spec_die = res.pdi; - cu = res.cu; - - spec_die->fixup (cu); - - if (spec_die->name) - { - name = spec_die->name; - - /* Copy DW_AT_external attribute if it is set. */ - if (spec_die->is_external) - is_external = spec_die->is_external; - } - } - - /* Set default names for some unnamed DIEs. */ - - if (name == NULL && tag == DW_TAG_namespace) - name = CP_ANONYMOUS_NAMESPACE_STR; - - /* If there is no parent die to provide a namespace, and there are - children, see if we can determine the namespace from their linkage - name. */ - if (cu->language == language_cplus - && !cu->per_cu->dwarf2_per_objfile->types.empty () - && die_parent == NULL - && has_children - && (tag == DW_TAG_class_type - || tag == DW_TAG_structure_type - || tag == DW_TAG_union_type)) - guess_partial_die_structure_name (this, cu); - - /* GCC might emit a nameless struct or union that has a linkage - name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */ - if (name == NULL - && (tag == DW_TAG_class_type - || tag == DW_TAG_interface_type - || tag == DW_TAG_structure_type - || tag == DW_TAG_union_type) - && linkage_name != NULL) - { - gdb::unique_xmalloc_ptr<char> demangled - (gdb_demangle (linkage_name, DMGL_TYPES)); - if (demangled != nullptr) - { - const char *base; - - /* Strip any leading namespaces/classes, keep only the base name. - DW_AT_name for named DIEs does not contain the prefixes. */ - base = strrchr (demangled.get (), ':'); - if (base && base > demangled.get () && base[-1] == ':') - base++; - else - base = demangled.get (); - - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - name = obstack_strdup (&objfile->per_bfd->storage_obstack, base); - } - } - - fixup_called = 1; -} - -/* Process the attributes that had to be skipped in the first round. These - attributes are the ones that need str_offsets_base or addr_base attributes. - They could not have been processed in the first round, because at the time - the values of str_offsets_base or addr_base may not have been known. */ -void read_attribute_reprocess (const struct die_reader_specs *reader, - struct attribute *attr) -{ - struct dwarf2_cu *cu = reader->cu; - switch (attr->form) - { - case DW_FORM_addrx: - case DW_FORM_GNU_addr_index: - DW_ADDR (attr) = read_addr_index (cu, DW_UNSND (attr)); - break; - case DW_FORM_strx: - case DW_FORM_strx1: - case DW_FORM_strx2: - case DW_FORM_strx3: - case DW_FORM_strx4: - case DW_FORM_GNU_str_index: - { - unsigned int str_index = DW_UNSND (attr); - if (reader->dwo_file != NULL) - { - DW_STRING (attr) = read_dwo_str_index (reader, str_index); - DW_STRING_IS_CANONICAL (attr) = 0; - } - else - { - DW_STRING (attr) = read_stub_str_index (cu, str_index); - DW_STRING_IS_CANONICAL (attr) = 0; - } - break; - } - default: - gdb_assert_not_reached (_("Unexpected DWARF form.")); - } -} - -/* Read an attribute value described by an attribute form. */ - -static const gdb_byte * -read_attribute_value (const struct die_reader_specs *reader, - struct attribute *attr, unsigned form, - LONGEST implicit_const, const gdb_byte *info_ptr, - bool *need_reprocess) -{ - struct dwarf2_cu *cu = reader->cu; - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - struct objfile *objfile = dwarf2_per_objfile->objfile; - struct gdbarch *gdbarch = get_objfile_arch (objfile); - bfd *abfd = reader->abfd; - struct comp_unit_head *cu_header = &cu->header; - unsigned int bytes_read; - struct dwarf_block *blk; - *need_reprocess = false; - - attr->form = (enum dwarf_form) form; - switch (form) - { - case DW_FORM_ref_addr: - if (cu->header.version == 2) - DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read); - else - DW_UNSND (attr) = read_offset (abfd, info_ptr, - &cu->header, &bytes_read); - info_ptr += bytes_read; - break; - case DW_FORM_GNU_ref_alt: - DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read); - info_ptr += bytes_read; - break; - case DW_FORM_addr: - DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read); - DW_ADDR (attr) = gdbarch_adjust_dwarf2_addr (gdbarch, DW_ADDR (attr)); - info_ptr += bytes_read; - break; - case DW_FORM_block2: - blk = dwarf_alloc_block (cu); - blk->size = read_2_bytes (abfd, info_ptr); - info_ptr += 2; - blk->data = read_n_bytes (abfd, info_ptr, blk->size); - info_ptr += blk->size; - DW_BLOCK (attr) = blk; - break; - case DW_FORM_block4: - blk = dwarf_alloc_block (cu); - blk->size = read_4_bytes (abfd, info_ptr); - info_ptr += 4; - blk->data = read_n_bytes (abfd, info_ptr, blk->size); - info_ptr += blk->size; - DW_BLOCK (attr) = blk; - break; - case DW_FORM_data2: - DW_UNSND (attr) = read_2_bytes (abfd, info_ptr); - info_ptr += 2; - break; - case DW_FORM_data4: - DW_UNSND (attr) = read_4_bytes (abfd, info_ptr); - info_ptr += 4; - break; - case DW_FORM_data8: - DW_UNSND (attr) = read_8_bytes (abfd, info_ptr); - info_ptr += 8; - break; - case DW_FORM_data16: - blk = dwarf_alloc_block (cu); - blk->size = 16; - blk->data = read_n_bytes (abfd, info_ptr, 16); - info_ptr += 16; - DW_BLOCK (attr) = blk; - break; - case DW_FORM_sec_offset: - DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read); - info_ptr += bytes_read; - break; - case DW_FORM_string: - DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read); - DW_STRING_IS_CANONICAL (attr) = 0; - info_ptr += bytes_read; - break; - case DW_FORM_strp: - if (!cu->per_cu->is_dwz) - { - DW_STRING (attr) = read_indirect_string (dwarf2_per_objfile, - abfd, info_ptr, cu_header, - &bytes_read); - DW_STRING_IS_CANONICAL (attr) = 0; - info_ptr += bytes_read; - break; - } - /* FALLTHROUGH */ - case DW_FORM_line_strp: - if (!cu->per_cu->is_dwz) - { - DW_STRING (attr) = read_indirect_line_string (dwarf2_per_objfile, - abfd, info_ptr, - cu_header, &bytes_read); - DW_STRING_IS_CANONICAL (attr) = 0; - info_ptr += bytes_read; - break; - } - /* FALLTHROUGH */ - case DW_FORM_GNU_strp_alt: - { - struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile); - LONGEST str_offset = read_offset (abfd, info_ptr, cu_header, - &bytes_read); - - DW_STRING (attr) = read_indirect_string_from_dwz (objfile, - dwz, str_offset); - DW_STRING_IS_CANONICAL (attr) = 0; - info_ptr += bytes_read; - } - break; - case DW_FORM_exprloc: - case DW_FORM_block: - blk = dwarf_alloc_block (cu); - blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); - info_ptr += bytes_read; - blk->data = read_n_bytes (abfd, info_ptr, blk->size); - info_ptr += blk->size; - DW_BLOCK (attr) = blk; - break; - case DW_FORM_block1: - blk = dwarf_alloc_block (cu); - blk->size = read_1_byte (abfd, info_ptr); - info_ptr += 1; - blk->data = read_n_bytes (abfd, info_ptr, blk->size); - info_ptr += blk->size; - DW_BLOCK (attr) = blk; - break; - case DW_FORM_data1: - DW_UNSND (attr) = read_1_byte (abfd, info_ptr); - info_ptr += 1; - break; - case DW_FORM_flag: - DW_UNSND (attr) = read_1_byte (abfd, info_ptr); - info_ptr += 1; - break; - case DW_FORM_flag_present: - DW_UNSND (attr) = 1; - break; - case DW_FORM_sdata: - DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read); - info_ptr += bytes_read; - break; - case DW_FORM_udata: - case DW_FORM_rnglistx: - DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); - info_ptr += bytes_read; - break; - case DW_FORM_ref1: - DW_UNSND (attr) = (to_underlying (cu->header.sect_off) - + read_1_byte (abfd, info_ptr)); - info_ptr += 1; - break; - case DW_FORM_ref2: - DW_UNSND (attr) = (to_underlying (cu->header.sect_off) - + read_2_bytes (abfd, info_ptr)); - info_ptr += 2; - break; - case DW_FORM_ref4: - DW_UNSND (attr) = (to_underlying (cu->header.sect_off) - + read_4_bytes (abfd, info_ptr)); - info_ptr += 4; - break; - case DW_FORM_ref8: - DW_UNSND (attr) = (to_underlying (cu->header.sect_off) - + read_8_bytes (abfd, info_ptr)); - info_ptr += 8; - break; - case DW_FORM_ref_sig8: - DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr); - info_ptr += 8; - break; - case DW_FORM_ref_udata: - DW_UNSND (attr) = (to_underlying (cu->header.sect_off) - + read_unsigned_leb128 (abfd, info_ptr, &bytes_read)); - info_ptr += bytes_read; - break; - case DW_FORM_indirect: - form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); - info_ptr += bytes_read; - if (form == DW_FORM_implicit_const) - { - implicit_const = read_signed_leb128 (abfd, info_ptr, &bytes_read); - info_ptr += bytes_read; - } - info_ptr = read_attribute_value (reader, attr, form, implicit_const, - info_ptr, need_reprocess); - break; - case DW_FORM_implicit_const: - DW_SND (attr) = implicit_const; - break; - case DW_FORM_addrx: - case DW_FORM_GNU_addr_index: - *need_reprocess = true; - DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); - info_ptr += bytes_read; - break; - case DW_FORM_strx: - case DW_FORM_strx1: - case DW_FORM_strx2: - case DW_FORM_strx3: - case DW_FORM_strx4: - case DW_FORM_GNU_str_index: - { - ULONGEST str_index; - if (form == DW_FORM_strx1) - { - str_index = read_1_byte (abfd, info_ptr); - info_ptr += 1; - } - else if (form == DW_FORM_strx2) - { - str_index = read_2_bytes (abfd, info_ptr); - info_ptr += 2; - } - else if (form == DW_FORM_strx3) - { - str_index = read_3_bytes (abfd, info_ptr); - info_ptr += 3; - } - else if (form == DW_FORM_strx4) - { - str_index = read_4_bytes (abfd, info_ptr); - info_ptr += 4; - } - else - { - str_index = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); - info_ptr += bytes_read; - } - *need_reprocess = true; - DW_UNSND (attr) = str_index; - } - break; - default: - error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"), - dwarf_form_name (form), - bfd_get_filename (abfd)); - } - - /* Super hack. */ - if (cu->per_cu->is_dwz && attr->form_is_ref ()) - attr->form = DW_FORM_GNU_ref_alt; - - /* We have seen instances where the compiler tried to emit a byte - size attribute of -1 which ended up being encoded as an unsigned - 0xffffffff. Although 0xffffffff is technically a valid size value, - an object of this size seems pretty unlikely so we can relatively - safely treat these cases as if the size attribute was invalid and - treat them as zero by default. */ - if (attr->name == DW_AT_byte_size - && form == DW_FORM_data4 - && DW_UNSND (attr) >= 0xffffffff) - { - complaint - (_("Suspicious DW_AT_byte_size value treated as zero instead of %s"), - hex_string (DW_UNSND (attr))); - DW_UNSND (attr) = 0; - } - - return info_ptr; -} - -/* Read an attribute described by an abbreviated attribute. */ - -static const gdb_byte * -read_attribute (const struct die_reader_specs *reader, - struct attribute *attr, struct attr_abbrev *abbrev, - const gdb_byte *info_ptr, bool *need_reprocess) -{ - attr->name = abbrev->name; - return read_attribute_value (reader, attr, abbrev->form, - abbrev->implicit_const, info_ptr, - need_reprocess); -} - -static CORE_ADDR -read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu, - unsigned int *bytes_read) -{ - struct comp_unit_head *cu_header = &cu->header; - CORE_ADDR retval = 0; - - if (cu_header->signed_addr_p) - { - switch (cu_header->addr_size) - { - case 2: - retval = bfd_get_signed_16 (abfd, buf); - break; - case 4: - retval = bfd_get_signed_32 (abfd, buf); - break; - case 8: - retval = bfd_get_signed_64 (abfd, buf); - break; - default: - internal_error (__FILE__, __LINE__, - _("read_address: bad switch, signed [in module %s]"), - bfd_get_filename (abfd)); - } - } - else - { - switch (cu_header->addr_size) - { - case 2: - retval = bfd_get_16 (abfd, buf); - break; - case 4: - retval = bfd_get_32 (abfd, buf); - break; - case 8: - retval = bfd_get_64 (abfd, buf); - break; - default: - internal_error (__FILE__, __LINE__, - _("read_address: bad switch, " - "unsigned [in module %s]"), - bfd_get_filename (abfd)); - } - } - - *bytes_read = cu_header->addr_size; - return retval; -} - -/* Read the initial length from a section. The (draft) DWARF 3 - specification allows the initial length to take up either 4 bytes - or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8 - bytes describe the length and all offsets will be 8 bytes in length - instead of 4. - - An older, non-standard 64-bit format is also handled by this - function. The older format in question stores the initial length - as an 8-byte quantity without an escape value. Lengths greater - than 2^32 aren't very common which means that the initial 4 bytes - is almost always zero. Since a length value of zero doesn't make - sense for the 32-bit format, this initial zero can be considered to - be an escape value which indicates the presence of the older 64-bit - format. As written, the code can't detect (old format) lengths - greater than 4GB. If it becomes necessary to handle lengths - somewhat larger than 4GB, we could allow other small values (such - as the non-sensical values of 1, 2, and 3) to also be used as - escape values indicating the presence of the old format. - - The value returned via bytes_read should be used to increment the - relevant pointer after calling read_initial_length(). - - [ Note: read_initial_length() and read_offset() are based on the - document entitled "DWARF Debugging Information Format", revision - 3, draft 8, dated November 19, 2001. This document was obtained - from: - - http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf - - This document is only a draft and is subject to change. (So beware.) - - Details regarding the older, non-standard 64-bit format were - determined empirically by examining 64-bit ELF files produced by - the SGI toolchain on an IRIX 6.5 machine. - - - Kevin, July 16, 2002 - ] */ - -static LONGEST -read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read) -{ - LONGEST length = bfd_get_32 (abfd, buf); - - if (length == 0xffffffff) - { - length = bfd_get_64 (abfd, buf + 4); - *bytes_read = 12; - } - else if (length == 0) - { - /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */ - length = bfd_get_64 (abfd, buf); - *bytes_read = 8; - } - else - { - *bytes_read = 4; - } - - return length; -} - -/* Cover function for read_initial_length. - Returns the length of the object at BUF, and stores the size of the - initial length in *BYTES_READ and stores the size that offsets will be in - *OFFSET_SIZE. - If the initial length size is not equivalent to that specified in - CU_HEADER then issue a complaint. - This is useful when reading non-comp-unit headers. */ - -static LONGEST -read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf, - const struct comp_unit_head *cu_header, - unsigned int *bytes_read, - unsigned int *offset_size) -{ - LONGEST length = read_initial_length (abfd, buf, bytes_read); - - gdb_assert (cu_header->initial_length_size == 4 - || cu_header->initial_length_size == 8 - || cu_header->initial_length_size == 12); - - if (cu_header->initial_length_size != *bytes_read) - complaint (_("intermixed 32-bit and 64-bit DWARF sections")); - - *offset_size = (*bytes_read == 4) ? 4 : 8; - return length; -} - -/* Read an offset from the data stream. The size of the offset is - given by cu_header->offset_size. */ - -static LONGEST -read_offset (bfd *abfd, const gdb_byte *buf, - const struct comp_unit_head *cu_header, - unsigned int *bytes_read) -{ - LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size); - - *bytes_read = cu_header->offset_size; - return offset; -} - -/* Read an offset from the data stream. */ - -static LONGEST -read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size) -{ - LONGEST retval = 0; - - switch (offset_size) - { - case 4: - retval = bfd_get_32 (abfd, buf); - break; - case 8: - retval = bfd_get_64 (abfd, buf); - break; - default: - internal_error (__FILE__, __LINE__, - _("read_offset_1: bad switch [in module %s]"), - bfd_get_filename (abfd)); - } - - return retval; -} - -static const gdb_byte * -read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size) -{ - /* If the size of a host char is 8 bits, we can return a pointer - to the buffer, otherwise we have to copy the data to a buffer - allocated on the temporary obstack. */ - gdb_assert (HOST_CHAR_BIT == 8); - return buf; -} - -static const char * -read_direct_string (bfd *abfd, const gdb_byte *buf, - unsigned int *bytes_read_ptr) -{ - /* If the size of a host char is 8 bits, we can return a pointer - to the string, otherwise we have to copy the string to a buffer - allocated on the temporary obstack. */ - gdb_assert (HOST_CHAR_BIT == 8); - if (*buf == '\0') - { - *bytes_read_ptr = 1; - return NULL; - } - *bytes_read_ptr = strlen ((const char *) buf) + 1; - return (const char *) buf; -} - -/* Return pointer to string at section SECT offset STR_OFFSET with error - reporting strings FORM_NAME and SECT_NAME. */ - -static const char * -read_indirect_string_at_offset_from (struct objfile *objfile, - bfd *abfd, LONGEST str_offset, - struct dwarf2_section_info *sect, - const char *form_name, - const char *sect_name) -{ - sect->read (objfile); - if (sect->buffer == NULL) - error (_("%s used without %s section [in module %s]"), - form_name, sect_name, bfd_get_filename (abfd)); - if (str_offset >= sect->size) - error (_("%s pointing outside of %s section [in module %s]"), - form_name, sect_name, bfd_get_filename (abfd)); - gdb_assert (HOST_CHAR_BIT == 8); - if (sect->buffer[str_offset] == '\0') - return NULL; - return (const char *) (sect->buffer + str_offset); -} - -/* Return pointer to string at .debug_str offset STR_OFFSET. */ - -static const char * -read_indirect_string_at_offset (struct dwarf2_per_objfile *dwarf2_per_objfile, - bfd *abfd, LONGEST str_offset) -{ - return read_indirect_string_at_offset_from (dwarf2_per_objfile->objfile, - abfd, str_offset, - &dwarf2_per_objfile->str, - "DW_FORM_strp", ".debug_str"); -} - -/* Return pointer to string at .debug_line_str offset STR_OFFSET. */ - -static const char * -read_indirect_line_string_at_offset (struct dwarf2_per_objfile *dwarf2_per_objfile, - bfd *abfd, LONGEST str_offset) -{ - return read_indirect_string_at_offset_from (dwarf2_per_objfile->objfile, - abfd, str_offset, - &dwarf2_per_objfile->line_str, - "DW_FORM_line_strp", - ".debug_line_str"); -} - -/* Read a string at offset STR_OFFSET in the .debug_str section from - the .dwz file DWZ. Throw an error if the offset is too large. If - the string consists of a single NUL byte, return NULL; otherwise - return a pointer to the string. */ - -static const char * -read_indirect_string_from_dwz (struct objfile *objfile, struct dwz_file *dwz, - LONGEST str_offset) -{ - dwz->str.read (objfile); - - if (dwz->str.buffer == NULL) - error (_("DW_FORM_GNU_strp_alt used without .debug_str " - "section [in module %s]"), - bfd_get_filename (dwz->dwz_bfd.get ())); - if (str_offset >= dwz->str.size) - error (_("DW_FORM_GNU_strp_alt pointing outside of " - ".debug_str section [in module %s]"), - bfd_get_filename (dwz->dwz_bfd.get ())); - gdb_assert (HOST_CHAR_BIT == 8); - if (dwz->str.buffer[str_offset] == '\0') - return NULL; - return (const char *) (dwz->str.buffer + str_offset); -} - -/* Return pointer to string at .debug_str offset as read from BUF. - BUF is assumed to be in a compilation unit described by CU_HEADER. - Return *BYTES_READ_PTR count of bytes read from BUF. */ - -static const char * -read_indirect_string (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *abfd, - const gdb_byte *buf, - const struct comp_unit_head *cu_header, - unsigned int *bytes_read_ptr) -{ - LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr); - - return read_indirect_string_at_offset (dwarf2_per_objfile, abfd, str_offset); -} - -/* Return pointer to string at .debug_line_str offset as read from BUF. - BUF is assumed to be in a compilation unit described by CU_HEADER. - Return *BYTES_READ_PTR count of bytes read from BUF. */ - -static const char * -read_indirect_line_string (struct dwarf2_per_objfile *dwarf2_per_objfile, - bfd *abfd, const gdb_byte *buf, - const struct comp_unit_head *cu_header, - unsigned int *bytes_read_ptr) -{ - LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr); - - return read_indirect_line_string_at_offset (dwarf2_per_objfile, abfd, - str_offset); -} - -/* Given index ADDR_INDEX in .debug_addr, fetch the value. - ADDR_BASE is the DW_AT_addr_base (DW_AT_GNU_addr_base) attribute or zero. - ADDR_SIZE is the size of addresses from the CU header. */ - -static CORE_ADDR -read_addr_index_1 (struct dwarf2_per_objfile *dwarf2_per_objfile, - unsigned int addr_index, gdb::optional<ULONGEST> addr_base, - int addr_size) -{ - struct objfile *objfile = dwarf2_per_objfile->objfile; - bfd *abfd = objfile->obfd; - const gdb_byte *info_ptr; - ULONGEST addr_base_or_zero = addr_base.has_value () ? *addr_base : 0; - - dwarf2_per_objfile->addr.read (objfile); - if (dwarf2_per_objfile->addr.buffer == NULL) - error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"), - objfile_name (objfile)); - if (addr_base_or_zero + addr_index * addr_size - >= dwarf2_per_objfile->addr.size) - error (_("DW_FORM_addr_index pointing outside of " - ".debug_addr section [in module %s]"), - objfile_name (objfile)); - info_ptr = (dwarf2_per_objfile->addr.buffer - + addr_base_or_zero + addr_index * addr_size); - if (addr_size == 4) - return bfd_get_32 (abfd, info_ptr); - else - return bfd_get_64 (abfd, info_ptr); -} - -/* Given index ADDR_INDEX in .debug_addr, fetch the value. */ - -static CORE_ADDR -read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index) -{ - return read_addr_index_1 (cu->per_cu->dwarf2_per_objfile, addr_index, - cu->addr_base, cu->header.addr_size); -} - -/* Given a pointer to an leb128 value, fetch the value from .debug_addr. */ - -static CORE_ADDR -read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr, - unsigned int *bytes_read) -{ - bfd *abfd = cu->per_cu->dwarf2_per_objfile->objfile->obfd; - unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read); - - return read_addr_index (cu, addr_index); -} - -/* Given an index in .debug_addr, fetch the value. - NOTE: This can be called during dwarf expression evaluation, - long after the debug information has been read, and thus per_cu->cu - may no longer exist. */ - -CORE_ADDR -dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu, - unsigned int addr_index) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile; - struct dwarf2_cu *cu = per_cu->cu; - gdb::optional<ULONGEST> addr_base; - int addr_size; - - /* We need addr_base and addr_size. - If we don't have PER_CU->cu, we have to get it. - Nasty, but the alternative is storing the needed info in PER_CU, - which at this point doesn't seem justified: it's not clear how frequently - it would get used and it would increase the size of every PER_CU. - Entry points like dwarf2_per_cu_addr_size do a similar thing - so we're not in uncharted territory here. - Alas we need to be a bit more complicated as addr_base is contained - in the DIE. - - We don't need to read the entire CU(/TU). - We just need the header and top level die. - - IWBN to use the aging mechanism to let us lazily later discard the CU. - For now we skip this optimization. */ - - if (cu != NULL) - { - addr_base = cu->addr_base; - addr_size = cu->header.addr_size; - } - else - { - cutu_reader reader (per_cu, NULL, 0, 0, false); - addr_base = reader.cu->addr_base; - addr_size = reader.cu->header.addr_size; - } - - return read_addr_index_1 (dwarf2_per_objfile, addr_index, addr_base, - addr_size); -} - -/* Given a DW_FORM_GNU_str_index value STR_INDEX, fetch the string. - STR_SECTION, STR_OFFSETS_SECTION can be from a Fission stub or a - DWO file. */ - -static const char * -read_str_index (struct dwarf2_cu *cu, - struct dwarf2_section_info *str_section, - struct dwarf2_section_info *str_offsets_section, - ULONGEST str_offsets_base, ULONGEST str_index) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - struct objfile *objfile = dwarf2_per_objfile->objfile; - const char *objf_name = objfile_name (objfile); - bfd *abfd = objfile->obfd; - const gdb_byte *info_ptr; - ULONGEST str_offset; - static const char form_name[] = "DW_FORM_GNU_str_index or DW_FORM_strx"; - - str_section->read (objfile); - str_offsets_section->read (objfile); - if (str_section->buffer == NULL) - error (_("%s used without %s section" - " in CU at offset %s [in module %s]"), - form_name, str_section->get_name (), - sect_offset_str (cu->header.sect_off), objf_name); - if (str_offsets_section->buffer == NULL) - error (_("%s used without %s section" - " in CU at offset %s [in module %s]"), - form_name, str_section->get_name (), - sect_offset_str (cu->header.sect_off), objf_name); - info_ptr = (str_offsets_section->buffer - + str_offsets_base - + str_index * cu->header.offset_size); - if (cu->header.offset_size == 4) - str_offset = bfd_get_32 (abfd, info_ptr); - else - str_offset = bfd_get_64 (abfd, info_ptr); - if (str_offset >= str_section->size) - error (_("Offset from %s pointing outside of" - " .debug_str.dwo section in CU at offset %s [in module %s]"), - form_name, sect_offset_str (cu->header.sect_off), objf_name); - return (const char *) (str_section->buffer + str_offset); -} - -/* Given a DW_FORM_GNU_str_index from a DWO file, fetch the string. */ - -static const char * -read_dwo_str_index (const struct die_reader_specs *reader, ULONGEST str_index) -{ - ULONGEST str_offsets_base = reader->cu->header.version >= 5 - ? reader->cu->header.addr_size : 0; - return read_str_index (reader->cu, - &reader->dwo_file->sections.str, - &reader->dwo_file->sections.str_offsets, - str_offsets_base, str_index); -} - -/* Given a DW_FORM_GNU_str_index from a Fission stub, fetch the string. */ - -static const char * -read_stub_str_index (struct dwarf2_cu *cu, ULONGEST str_index) -{ - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - const char *objf_name = objfile_name (objfile); - static const char form_name[] = "DW_FORM_GNU_str_index"; - static const char str_offsets_attr_name[] = "DW_AT_str_offsets"; - - if (!cu->str_offsets_base.has_value ()) - error (_("%s used in Fission stub without %s" - " in CU at offset 0x%lx [in module %s]"), - form_name, str_offsets_attr_name, - (long) cu->header.offset_size, objf_name); - - return read_str_index (cu, - &cu->per_cu->dwarf2_per_objfile->str, - &cu->per_cu->dwarf2_per_objfile->str_offsets, - *cu->str_offsets_base, str_index); -} - -/* Return the length of an LEB128 number in BUF. */ - -static int -leb128_size (const gdb_byte *buf) -{ - const gdb_byte *begin = buf; - gdb_byte byte; - - while (1) - { - byte = *buf++; - if ((byte & 128) == 0) - return buf - begin; - } -} - -static void -set_cu_language (unsigned int lang, struct dwarf2_cu *cu) -{ - switch (lang) - { - case DW_LANG_C89: - case DW_LANG_C99: - case DW_LANG_C11: - case DW_LANG_C: - case DW_LANG_UPC: - cu->language = language_c; - break; - case DW_LANG_Java: - case DW_LANG_C_plus_plus: - case DW_LANG_C_plus_plus_11: - case DW_LANG_C_plus_plus_14: - cu->language = language_cplus; - break; - case DW_LANG_D: - cu->language = language_d; - break; - case DW_LANG_Fortran77: - case DW_LANG_Fortran90: - case DW_LANG_Fortran95: - case DW_LANG_Fortran03: - case DW_LANG_Fortran08: - cu->language = language_fortran; - break; - case DW_LANG_Go: - cu->language = language_go; - break; - case DW_LANG_Mips_Assembler: - cu->language = language_asm; - break; - case DW_LANG_Ada83: - case DW_LANG_Ada95: - cu->language = language_ada; - break; - case DW_LANG_Modula2: - cu->language = language_m2; - break; - case DW_LANG_Pascal83: - cu->language = language_pascal; - break; - case DW_LANG_ObjC: - cu->language = language_objc; - break; - case DW_LANG_Rust: - case DW_LANG_Rust_old: - cu->language = language_rust; - break; - case DW_LANG_Cobol74: - case DW_LANG_Cobol85: - default: - cu->language = language_minimal; - break; - } - cu->language_defn = language_def (cu->language); -} - -/* Return the named attribute or NULL if not there. */ - -static struct attribute * -dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu) -{ - for (;;) - { - unsigned int i; - struct attribute *spec = NULL; - - for (i = 0; i < die->num_attrs; ++i) - { - if (die->attrs[i].name == name) - return &die->attrs[i]; - if (die->attrs[i].name == DW_AT_specification - || die->attrs[i].name == DW_AT_abstract_origin) - spec = &die->attrs[i]; - } - - if (!spec) - break; - - die = follow_die_ref (die, spec, &cu); - } - - return NULL; -} - -/* Return the named attribute or NULL if not there, - but do not follow DW_AT_specification, etc. - This is for use in contexts where we're reading .debug_types dies. - Following DW_AT_specification, DW_AT_abstract_origin will take us - back up the chain, and we want to go down. */ - -static struct attribute * -dwarf2_attr_no_follow (struct die_info *die, unsigned int name) -{ - unsigned int i; - - for (i = 0; i < die->num_attrs; ++i) - if (die->attrs[i].name == name) - return &die->attrs[i]; - - return NULL; -} - -/* Return the string associated with a string-typed attribute, or NULL if it - is either not found or is of an incorrect type. */ - -static const char * -dwarf2_string_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu) -{ - struct attribute *attr; - const char *str = NULL; - - attr = dwarf2_attr (die, name, cu); - - if (attr != NULL) - { - if (attr->form == DW_FORM_strp || attr->form == DW_FORM_line_strp - || attr->form == DW_FORM_string - || attr->form == DW_FORM_strx - || attr->form == DW_FORM_strx1 - || attr->form == DW_FORM_strx2 - || attr->form == DW_FORM_strx3 - || attr->form == DW_FORM_strx4 - || attr->form == DW_FORM_GNU_str_index - || attr->form == DW_FORM_GNU_strp_alt) - str = DW_STRING (attr); - else - complaint (_("string type expected for attribute %s for " - "DIE at %s in module %s"), - dwarf_attr_name (name), sect_offset_str (die->sect_off), - objfile_name (cu->per_cu->dwarf2_per_objfile->objfile)); - } - - return str; -} - -/* Return the dwo name or NULL if not present. If present, it is in either - DW_AT_GNU_dwo_name or DW_AT_dwo_name attribute. */ -static const char * -dwarf2_dwo_name (struct die_info *die, struct dwarf2_cu *cu) -{ - const char *dwo_name = dwarf2_string_attr (die, DW_AT_GNU_dwo_name, cu); - if (dwo_name == nullptr) - dwo_name = dwarf2_string_attr (die, DW_AT_dwo_name, cu); - return dwo_name; -} - -/* Return non-zero iff the attribute NAME is defined for the given DIE, - and holds a non-zero value. This function should only be used for - DW_FORM_flag or DW_FORM_flag_present attributes. */ - -static int -dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu) -{ - struct attribute *attr = dwarf2_attr (die, name, cu); - - return (attr && DW_UNSND (attr)); -} - -static int -die_is_declaration (struct die_info *die, struct dwarf2_cu *cu) -{ - /* A DIE is a declaration if it has a DW_AT_declaration attribute - which value is non-zero. However, we have to be careful with - DIEs having a DW_AT_specification attribute, because dwarf2_attr() - (via dwarf2_flag_true_p) follows this attribute. So we may - end up accidently finding a declaration attribute that belongs - to a different DIE referenced by the specification attribute, - even though the given DIE does not have a declaration attribute. */ - return (dwarf2_flag_true_p (die, DW_AT_declaration, cu) - && dwarf2_attr (die, DW_AT_specification, cu) == NULL); -} - -/* Return the die giving the specification for DIE, if there is - one. *SPEC_CU is the CU containing DIE on input, and the CU - containing the return value on output. If there is no - specification, but there is an abstract origin, that is - returned. */ - -static struct die_info * -die_specification (struct die_info *die, struct dwarf2_cu **spec_cu) -{ - struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification, - *spec_cu); - - if (spec_attr == NULL) - spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu); - - if (spec_attr == NULL) - return NULL; - else - return follow_die_ref (die, spec_attr, spec_cu); -} - -/* Stub for free_line_header to match void * callback types. */ - -static void -free_line_header_voidp (void *arg) -{ - struct line_header *lh = (struct line_header *) arg; - - delete lh; -} - -void -line_header::add_include_dir (const char *include_dir) -{ - if (dwarf_line_debug >= 2) - { - size_t new_size; - if (version >= 5) - new_size = m_include_dirs.size (); - else - new_size = m_include_dirs.size () + 1; - fprintf_unfiltered (gdb_stdlog, "Adding dir %zu: %s\n", - new_size, include_dir); - } - m_include_dirs.push_back (include_dir); -} - -void -line_header::add_file_name (const char *name, - dir_index d_index, - unsigned int mod_time, - unsigned int length) -{ - if (dwarf_line_debug >= 2) - { - size_t new_size; - if (version >= 5) - new_size = file_names_size (); - else - new_size = file_names_size () + 1; - fprintf_unfiltered (gdb_stdlog, "Adding file %zu: %s\n", - new_size, name); - } - m_file_names.emplace_back (name, d_index, mod_time, length); -} - -/* A convenience function to find the proper .debug_line section for a CU. */ - -static struct dwarf2_section_info * -get_debug_line_section (struct dwarf2_cu *cu) -{ - struct dwarf2_section_info *section; - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - - /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the - DWO file. */ - if (cu->dwo_unit && cu->per_cu->is_debug_types) - section = &cu->dwo_unit->dwo_file->sections.line; - else if (cu->per_cu->is_dwz) - { - struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile); - - section = &dwz->line; - } - else - section = &dwarf2_per_objfile->line; - - return section; -} - -/* Read directory or file name entry format, starting with byte of - format count entries, ULEB128 pairs of entry formats, ULEB128 of - entries count and the entries themselves in the described entry - format. */ - -static void -read_formatted_entries (struct dwarf2_per_objfile *dwarf2_per_objfile, - bfd *abfd, const gdb_byte **bufp, - struct line_header *lh, - const struct comp_unit_head *cu_header, - void (*callback) (struct line_header *lh, - const char *name, - dir_index d_index, - unsigned int mod_time, - unsigned int length)) -{ - gdb_byte format_count, formati; - ULONGEST data_count, datai; - const gdb_byte *buf = *bufp; - const gdb_byte *format_header_data; - unsigned int bytes_read; - - format_count = read_1_byte (abfd, buf); - buf += 1; - format_header_data = buf; - for (formati = 0; formati < format_count; formati++) - { - read_unsigned_leb128 (abfd, buf, &bytes_read); - buf += bytes_read; - read_unsigned_leb128 (abfd, buf, &bytes_read); - buf += bytes_read; - } - - data_count = read_unsigned_leb128 (abfd, buf, &bytes_read); - buf += bytes_read; - for (datai = 0; datai < data_count; datai++) - { - const gdb_byte *format = format_header_data; - struct file_entry fe; - - for (formati = 0; formati < format_count; formati++) - { - ULONGEST content_type = read_unsigned_leb128 (abfd, format, &bytes_read); - format += bytes_read; - - ULONGEST form = read_unsigned_leb128 (abfd, format, &bytes_read); - format += bytes_read; - - gdb::optional<const char *> string; - gdb::optional<unsigned int> uint; - - switch (form) - { - case DW_FORM_string: - string.emplace (read_direct_string (abfd, buf, &bytes_read)); - buf += bytes_read; - break; - - case DW_FORM_line_strp: - string.emplace (read_indirect_line_string (dwarf2_per_objfile, - abfd, buf, - cu_header, - &bytes_read)); - buf += bytes_read; - break; - - case DW_FORM_data1: - uint.emplace (read_1_byte (abfd, buf)); - buf += 1; - break; - - case DW_FORM_data2: - uint.emplace (read_2_bytes (abfd, buf)); - buf += 2; - break; - - case DW_FORM_data4: - uint.emplace (read_4_bytes (abfd, buf)); - buf += 4; - break; - - case DW_FORM_data8: - uint.emplace (read_8_bytes (abfd, buf)); - buf += 8; - break; - - case DW_FORM_data16: - /* This is used for MD5, but file_entry does not record MD5s. */ - buf += 16; - break; - - case DW_FORM_udata: - uint.emplace (read_unsigned_leb128 (abfd, buf, &bytes_read)); - buf += bytes_read; - break; - - case DW_FORM_block: - /* It is valid only for DW_LNCT_timestamp which is ignored by - current GDB. */ - break; - } - - switch (content_type) - { - case DW_LNCT_path: - if (string.has_value ()) - fe.name = *string; - break; - case DW_LNCT_directory_index: - if (uint.has_value ()) - fe.d_index = (dir_index) *uint; - break; - case DW_LNCT_timestamp: - if (uint.has_value ()) - fe.mod_time = *uint; - break; - case DW_LNCT_size: - if (uint.has_value ()) - fe.length = *uint; - break; - case DW_LNCT_MD5: - break; - default: - complaint (_("Unknown format content type %s"), - pulongest (content_type)); - } - } - - callback (lh, fe.name, fe.d_index, fe.mod_time, fe.length); - } - - *bufp = buf; -} - -/* Read the statement program header starting at OFFSET in - .debug_line, or .debug_line.dwo. Return a pointer - to a struct line_header, allocated using xmalloc. - Returns NULL if there is a problem reading the header, e.g., if it - has a version we don't understand. - - NOTE: the strings in the include directory and file name tables of - the returned object point into the dwarf line section buffer, - and must not be freed. */ - -static line_header_up -dwarf_decode_line_header (sect_offset sect_off, struct dwarf2_cu *cu) -{ - const gdb_byte *line_ptr; - unsigned int bytes_read, offset_size; - int i; - const char *cur_dir, *cur_file; - struct dwarf2_section_info *section; - bfd *abfd; - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - - section = get_debug_line_section (cu); - section->read (dwarf2_per_objfile->objfile); - if (section->buffer == NULL) - { - if (cu->dwo_unit && cu->per_cu->is_debug_types) - complaint (_("missing .debug_line.dwo section")); - else - complaint (_("missing .debug_line section")); - return 0; - } - - /* We can't do this until we know the section is non-empty. - Only then do we know we have such a section. */ - abfd = section->get_bfd_owner (); - - /* Make sure that at least there's room for the total_length field. - That could be 12 bytes long, but we're just going to fudge that. */ - if (to_underlying (sect_off) + 4 >= section->size) - { - dwarf2_statement_list_fits_in_line_number_section_complaint (); - return 0; - } - - line_header_up lh (new line_header ()); - - lh->sect_off = sect_off; - lh->offset_in_dwz = cu->per_cu->is_dwz; - - line_ptr = section->buffer + to_underlying (sect_off); - - /* Read in the header. */ - lh->total_length = - read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header, - &bytes_read, &offset_size); - line_ptr += bytes_read; - - const gdb_byte *start_here = line_ptr; - - if (line_ptr + lh->total_length > (section->buffer + section->size)) - { - dwarf2_statement_list_fits_in_line_number_section_complaint (); - return 0; - } - lh->statement_program_end = start_here + lh->total_length; - lh->version = read_2_bytes (abfd, line_ptr); - line_ptr += 2; - if (lh->version > 5) - { - /* This is a version we don't understand. The format could have - changed in ways we don't handle properly so just punt. */ - complaint (_("unsupported version in .debug_line section")); - return NULL; - } - if (lh->version >= 5) - { - gdb_byte segment_selector_size; - - /* Skip address size. */ - read_1_byte (abfd, line_ptr); - line_ptr += 1; - - segment_selector_size = read_1_byte (abfd, line_ptr); - line_ptr += 1; - if (segment_selector_size != 0) - { - complaint (_("unsupported segment selector size %u " - "in .debug_line section"), - segment_selector_size); - return NULL; - } - } - lh->header_length = read_offset_1 (abfd, line_ptr, offset_size); - line_ptr += offset_size; - lh->statement_program_start = line_ptr + lh->header_length; - lh->minimum_instruction_length = read_1_byte (abfd, line_ptr); - line_ptr += 1; - if (lh->version >= 4) - { - lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr); - line_ptr += 1; - } - else - lh->maximum_ops_per_instruction = 1; - - if (lh->maximum_ops_per_instruction == 0) - { - lh->maximum_ops_per_instruction = 1; - complaint (_("invalid maximum_ops_per_instruction " - "in `.debug_line' section")); - } - - lh->default_is_stmt = read_1_byte (abfd, line_ptr); - line_ptr += 1; - lh->line_base = read_1_signed_byte (abfd, line_ptr); - line_ptr += 1; - lh->line_range = read_1_byte (abfd, line_ptr); - line_ptr += 1; - lh->opcode_base = read_1_byte (abfd, line_ptr); - line_ptr += 1; - lh->standard_opcode_lengths.reset (new unsigned char[lh->opcode_base]); - - lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */ - for (i = 1; i < lh->opcode_base; ++i) - { - lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr); - line_ptr += 1; - } - - if (lh->version >= 5) - { - /* Read directory table. */ - read_formatted_entries (dwarf2_per_objfile, abfd, &line_ptr, lh.get (), - &cu->header, - [] (struct line_header *header, const char *name, - dir_index d_index, unsigned int mod_time, - unsigned int length) - { - header->add_include_dir (name); - }); - - /* Read file name table. */ - read_formatted_entries (dwarf2_per_objfile, abfd, &line_ptr, lh.get (), - &cu->header, - [] (struct line_header *header, const char *name, - dir_index d_index, unsigned int mod_time, - unsigned int length) - { - header->add_file_name (name, d_index, mod_time, length); - }); - } - else - { - /* Read directory table. */ - while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL) - { - line_ptr += bytes_read; - lh->add_include_dir (cur_dir); - } - line_ptr += bytes_read; - - /* Read file name table. */ - while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL) - { - unsigned int mod_time, length; - dir_index d_index; - - line_ptr += bytes_read; - d_index = (dir_index) read_unsigned_leb128 (abfd, line_ptr, &bytes_read); - line_ptr += bytes_read; - mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read); - line_ptr += bytes_read; - length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read); - line_ptr += bytes_read; - - lh->add_file_name (cur_file, d_index, mod_time, length); - } - line_ptr += bytes_read; - } - - if (line_ptr > (section->buffer + section->size)) - complaint (_("line number info header doesn't " - "fit in `.debug_line' section")); - - return lh; -} - -/* Subroutine of dwarf_decode_lines to simplify it. - Return the file name of the psymtab for the given file_entry. - COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown. - If space for the result is malloc'd, *NAME_HOLDER will be set. - Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename. */ - -static const char * -psymtab_include_file_name (const struct line_header *lh, const file_entry &fe, - const dwarf2_psymtab *pst, - const char *comp_dir, - gdb::unique_xmalloc_ptr<char> *name_holder) -{ - const char *include_name = fe.name; - const char *include_name_to_compare = include_name; - const char *pst_filename; - int file_is_pst; - - const char *dir_name = fe.include_dir (lh); - - gdb::unique_xmalloc_ptr<char> hold_compare; - if (!IS_ABSOLUTE_PATH (include_name) - && (dir_name != NULL || comp_dir != NULL)) - { - /* Avoid creating a duplicate psymtab for PST. - We do this by comparing INCLUDE_NAME and PST_FILENAME. - Before we do the comparison, however, we need to account - for DIR_NAME and COMP_DIR. - First prepend dir_name (if non-NULL). If we still don't - have an absolute path prepend comp_dir (if non-NULL). - However, the directory we record in the include-file's - psymtab does not contain COMP_DIR (to match the - corresponding symtab(s)). - - Example: - - bash$ cd /tmp - bash$ gcc -g ./hello.c - include_name = "hello.c" - dir_name = "." - DW_AT_comp_dir = comp_dir = "/tmp" - DW_AT_name = "./hello.c" - - */ - - if (dir_name != NULL) - { - name_holder->reset (concat (dir_name, SLASH_STRING, - include_name, (char *) NULL)); - include_name = name_holder->get (); - include_name_to_compare = include_name; - } - if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL) - { - hold_compare.reset (concat (comp_dir, SLASH_STRING, - include_name, (char *) NULL)); - include_name_to_compare = hold_compare.get (); - } - } - - pst_filename = pst->filename; - gdb::unique_xmalloc_ptr<char> copied_name; - if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL) - { - copied_name.reset (concat (pst->dirname, SLASH_STRING, - pst_filename, (char *) NULL)); - pst_filename = copied_name.get (); - } - - file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0; - - if (file_is_pst) - return NULL; - return include_name; -} - -/* State machine to track the state of the line number program. */ - -class lnp_state_machine -{ -public: - /* Initialize a machine state for the start of a line number - program. */ - lnp_state_machine (struct dwarf2_cu *cu, gdbarch *arch, line_header *lh, - bool record_lines_p); - - file_entry *current_file () - { - /* lh->file_names is 0-based, but the file name numbers in the - statement program are 1-based. */ - return m_line_header->file_name_at (m_file); - } - - /* Record the line in the state machine. END_SEQUENCE is true if - we're processing the end of a sequence. */ - void record_line (bool end_sequence); - - /* Check ADDRESS is zero and less than UNRELOCATED_LOWPC and if true - nop-out rest of the lines in this sequence. */ - void check_line_address (struct dwarf2_cu *cu, - const gdb_byte *line_ptr, - CORE_ADDR unrelocated_lowpc, CORE_ADDR address); - - void handle_set_discriminator (unsigned int discriminator) - { - m_discriminator = discriminator; - m_line_has_non_zero_discriminator |= discriminator != 0; - } - - /* Handle DW_LNE_set_address. */ - void handle_set_address (CORE_ADDR baseaddr, CORE_ADDR address) - { - m_op_index = 0; - address += baseaddr; - m_address = gdbarch_adjust_dwarf2_line (m_gdbarch, address, false); - } - - /* Handle DW_LNS_advance_pc. */ - void handle_advance_pc (CORE_ADDR adjust); - - /* Handle a special opcode. */ - void handle_special_opcode (unsigned char op_code); - - /* Handle DW_LNS_advance_line. */ - void handle_advance_line (int line_delta) - { - advance_line (line_delta); - } - - /* Handle DW_LNS_set_file. */ - void handle_set_file (file_name_index file); - - /* Handle DW_LNS_negate_stmt. */ - void handle_negate_stmt () - { - m_is_stmt = !m_is_stmt; - } - - /* Handle DW_LNS_const_add_pc. */ - void handle_const_add_pc (); - - /* Handle DW_LNS_fixed_advance_pc. */ - void handle_fixed_advance_pc (CORE_ADDR addr_adj) - { - m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true); - m_op_index = 0; - } - - /* Handle DW_LNS_copy. */ - void handle_copy () - { - record_line (false); - m_discriminator = 0; - } - - /* Handle DW_LNE_end_sequence. */ - void handle_end_sequence () - { - m_currently_recording_lines = true; - } - -private: - /* Advance the line by LINE_DELTA. */ - void advance_line (int line_delta) - { - m_line += line_delta; - - if (line_delta != 0) - m_line_has_non_zero_discriminator = m_discriminator != 0; - } - - struct dwarf2_cu *m_cu; - - gdbarch *m_gdbarch; - - /* True if we're recording lines. - Otherwise we're building partial symtabs and are just interested in - finding include files mentioned by the line number program. */ - bool m_record_lines_p; - - /* The line number header. */ - line_header *m_line_header; - - /* These are part of the standard DWARF line number state machine, - and initialized according to the DWARF spec. */ - - unsigned char m_op_index = 0; - /* The line table index of the current file. */ - file_name_index m_file = 1; - unsigned int m_line = 1; - - /* These are initialized in the constructor. */ - - CORE_ADDR m_address; - bool m_is_stmt; - unsigned int m_discriminator; - - /* Additional bits of state we need to track. */ - - /* The last file that we called dwarf2_start_subfile for. - This is only used for TLLs. */ - unsigned int m_last_file = 0; - /* The last file a line number was recorded for. */ - struct subfile *m_last_subfile = NULL; - - /* When true, record the lines we decode. */ - bool m_currently_recording_lines = false; - - /* The last line number that was recorded, used to coalesce - consecutive entries for the same line. This can happen, for - example, when discriminators are present. PR 17276. */ - unsigned int m_last_line = 0; - bool m_line_has_non_zero_discriminator = false; -}; - -void -lnp_state_machine::handle_advance_pc (CORE_ADDR adjust) -{ - CORE_ADDR addr_adj = (((m_op_index + adjust) - / m_line_header->maximum_ops_per_instruction) - * m_line_header->minimum_instruction_length); - m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true); - m_op_index = ((m_op_index + adjust) - % m_line_header->maximum_ops_per_instruction); -} - -void -lnp_state_machine::handle_special_opcode (unsigned char op_code) -{ - unsigned char adj_opcode = op_code - m_line_header->opcode_base; - CORE_ADDR addr_adj = (((m_op_index - + (adj_opcode / m_line_header->line_range)) - / m_line_header->maximum_ops_per_instruction) - * m_line_header->minimum_instruction_length); - m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true); - m_op_index = ((m_op_index + (adj_opcode / m_line_header->line_range)) - % m_line_header->maximum_ops_per_instruction); - - int line_delta = (m_line_header->line_base - + (adj_opcode % m_line_header->line_range)); - advance_line (line_delta); - record_line (false); - m_discriminator = 0; -} - -void -lnp_state_machine::handle_set_file (file_name_index file) -{ - m_file = file; - - const file_entry *fe = current_file (); - if (fe == NULL) - dwarf2_debug_line_missing_file_complaint (); - else if (m_record_lines_p) - { - const char *dir = fe->include_dir (m_line_header); - - m_last_subfile = m_cu->get_builder ()->get_current_subfile (); - m_line_has_non_zero_discriminator = m_discriminator != 0; - dwarf2_start_subfile (m_cu, fe->name, dir); - } -} - -void -lnp_state_machine::handle_const_add_pc () -{ - CORE_ADDR adjust - = (255 - m_line_header->opcode_base) / m_line_header->line_range; - - CORE_ADDR addr_adj - = (((m_op_index + adjust) - / m_line_header->maximum_ops_per_instruction) - * m_line_header->minimum_instruction_length); - - m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true); - m_op_index = ((m_op_index + adjust) - % m_line_header->maximum_ops_per_instruction); -} - -/* Return non-zero if we should add LINE to the line number table. - LINE is the line to add, LAST_LINE is the last line that was added, - LAST_SUBFILE is the subfile for LAST_LINE. - LINE_HAS_NON_ZERO_DISCRIMINATOR is non-zero if LINE has ever - had a non-zero discriminator. - - We have to be careful in the presence of discriminators. - E.g., for this line: - - for (i = 0; i < 100000; i++); - - clang can emit four line number entries for that one line, - each with a different discriminator. - See gdb.dwarf2/dw2-single-line-discriminators.exp for an example. - - However, we want gdb to coalesce all four entries into one. - Otherwise the user could stepi into the middle of the line and - gdb would get confused about whether the pc really was in the - middle of the line. - - Things are further complicated by the fact that two consecutive - line number entries for the same line is a heuristic used by gcc - to denote the end of the prologue. So we can't just discard duplicate - entries, we have to be selective about it. The heuristic we use is - that we only collapse consecutive entries for the same line if at least - one of those entries has a non-zero discriminator. PR 17276. - - Note: Addresses in the line number state machine can never go backwards - within one sequence, thus this coalescing is ok. */ - -static int -dwarf_record_line_p (struct dwarf2_cu *cu, - unsigned int line, unsigned int last_line, - int line_has_non_zero_discriminator, - struct subfile *last_subfile) -{ - if (cu->get_builder ()->get_current_subfile () != last_subfile) - return 1; - if (line != last_line) - return 1; - /* Same line for the same file that we've seen already. - As a last check, for pr 17276, only record the line if the line - has never had a non-zero discriminator. */ - if (!line_has_non_zero_discriminator) - return 1; - return 0; -} - -/* Use the CU's builder to record line number LINE beginning at - address ADDRESS in the line table of subfile SUBFILE. */ - -static void -dwarf_record_line_1 (struct gdbarch *gdbarch, struct subfile *subfile, - unsigned int line, CORE_ADDR address, - struct dwarf2_cu *cu) -{ - CORE_ADDR addr = gdbarch_addr_bits_remove (gdbarch, address); - - if (dwarf_line_debug) - { - fprintf_unfiltered (gdb_stdlog, - "Recording line %u, file %s, address %s\n", - line, lbasename (subfile->name), - paddress (gdbarch, address)); - } - - if (cu != nullptr) - cu->get_builder ()->record_line (subfile, line, addr); -} - -/* Subroutine of dwarf_decode_lines_1 to simplify it. - Mark the end of a set of line number records. - The arguments are the same as for dwarf_record_line_1. - If SUBFILE is NULL the request is ignored. */ - -static void -dwarf_finish_line (struct gdbarch *gdbarch, struct subfile *subfile, - CORE_ADDR address, struct dwarf2_cu *cu) -{ - if (subfile == NULL) - return; - - if (dwarf_line_debug) - { - fprintf_unfiltered (gdb_stdlog, - "Finishing current line, file %s, address %s\n", - lbasename (subfile->name), - paddress (gdbarch, address)); - } - - dwarf_record_line_1 (gdbarch, subfile, 0, address, cu); -} - -void -lnp_state_machine::record_line (bool end_sequence) -{ - if (dwarf_line_debug) - { - fprintf_unfiltered (gdb_stdlog, - "Processing actual line %u: file %u," - " address %s, is_stmt %u, discrim %u%s\n", - m_line, m_file, - paddress (m_gdbarch, m_address), - m_is_stmt, m_discriminator, - (end_sequence ? "\t(end sequence)" : "")); - } - - file_entry *fe = current_file (); - - if (fe == NULL) - dwarf2_debug_line_missing_file_complaint (); - /* For now we ignore lines not starting on an instruction boundary. - But not when processing end_sequence for compatibility with the - previous version of the code. */ - else if (m_op_index == 0 || end_sequence) - { - fe->included_p = 1; - if (m_record_lines_p - && (producer_is_codewarrior (m_cu) || m_is_stmt || end_sequence)) - { - if (m_last_subfile != m_cu->get_builder ()->get_current_subfile () - || end_sequence) - { - dwarf_finish_line (m_gdbarch, m_last_subfile, m_address, - m_currently_recording_lines ? m_cu : nullptr); - } - - if (!end_sequence) - { - if (dwarf_record_line_p (m_cu, m_line, m_last_line, - m_line_has_non_zero_discriminator, - m_last_subfile)) - { - buildsym_compunit *builder = m_cu->get_builder (); - dwarf_record_line_1 (m_gdbarch, - builder->get_current_subfile (), - m_line, m_address, - m_currently_recording_lines ? m_cu : nullptr); - } - m_last_subfile = m_cu->get_builder ()->get_current_subfile (); - m_last_line = m_line; - } - } - } -} - -lnp_state_machine::lnp_state_machine (struct dwarf2_cu *cu, gdbarch *arch, - line_header *lh, bool record_lines_p) -{ - m_cu = cu; - m_gdbarch = arch; - m_record_lines_p = record_lines_p; - m_line_header = lh; - - m_currently_recording_lines = true; - - /* Call `gdbarch_adjust_dwarf2_line' on the initial 0 address as if there - was a line entry for it so that the backend has a chance to adjust it - and also record it in case it needs it. This is currently used by MIPS - code, cf. `mips_adjust_dwarf2_line'. */ - m_address = gdbarch_adjust_dwarf2_line (arch, 0, 0); - m_is_stmt = lh->default_is_stmt; - m_discriminator = 0; -} - -void -lnp_state_machine::check_line_address (struct dwarf2_cu *cu, - const gdb_byte *line_ptr, - CORE_ADDR unrelocated_lowpc, CORE_ADDR address) -{ - /* If ADDRESS < UNRELOCATED_LOWPC then it's not a usable value, it's outside - the pc range of the CU. However, we restrict the test to only ADDRESS - values of zero to preserve GDB's previous behaviour which is to handle - the specific case of a function being GC'd by the linker. */ - - if (address == 0 && address < unrelocated_lowpc) - { - /* This line table is for a function which has been - GCd by the linker. Ignore it. PR gdb/12528 */ - - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - long line_offset = line_ptr - get_debug_line_section (cu)->buffer; - - complaint (_(".debug_line address at offset 0x%lx is 0 [in module %s]"), - line_offset, objfile_name (objfile)); - m_currently_recording_lines = false; - /* Note: m_currently_recording_lines is left as false until we see - DW_LNE_end_sequence. */ - } -} - -/* Subroutine of dwarf_decode_lines to simplify it. - Process the line number information in LH. - If DECODE_FOR_PST_P is non-zero, all we do is process the line number - program in order to set included_p for every referenced header. */ - -static void -dwarf_decode_lines_1 (struct line_header *lh, struct dwarf2_cu *cu, - const int decode_for_pst_p, CORE_ADDR lowpc) -{ - const gdb_byte *line_ptr, *extended_end; - const gdb_byte *line_end; - unsigned int bytes_read, extended_len; - unsigned char op_code, extended_op; - CORE_ADDR baseaddr; - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - bfd *abfd = objfile->obfd; - struct gdbarch *gdbarch = get_objfile_arch (objfile); - /* True if we're recording line info (as opposed to building partial - symtabs and just interested in finding include files mentioned by - the line number program). */ - bool record_lines_p = !decode_for_pst_p; - - baseaddr = objfile->text_section_offset (); - - line_ptr = lh->statement_program_start; - line_end = lh->statement_program_end; - - /* Read the statement sequences until there's nothing left. */ - while (line_ptr < line_end) - { - /* The DWARF line number program state machine. Reset the state - machine at the start of each sequence. */ - lnp_state_machine state_machine (cu, gdbarch, lh, record_lines_p); - bool end_sequence = false; - - if (record_lines_p) - { - /* Start a subfile for the current file of the state - machine. */ - const file_entry *fe = state_machine.current_file (); - - if (fe != NULL) - dwarf2_start_subfile (cu, fe->name, fe->include_dir (lh)); - } - - /* Decode the table. */ - while (line_ptr < line_end && !end_sequence) - { - op_code = read_1_byte (abfd, line_ptr); - line_ptr += 1; - - if (op_code >= lh->opcode_base) - { - /* Special opcode. */ - state_machine.handle_special_opcode (op_code); - } - else switch (op_code) - { - case DW_LNS_extended_op: - extended_len = read_unsigned_leb128 (abfd, line_ptr, - &bytes_read); - line_ptr += bytes_read; - extended_end = line_ptr + extended_len; - extended_op = read_1_byte (abfd, line_ptr); - line_ptr += 1; - switch (extended_op) - { - case DW_LNE_end_sequence: - state_machine.handle_end_sequence (); - end_sequence = true; - break; - case DW_LNE_set_address: - { - CORE_ADDR address - = read_address (abfd, line_ptr, cu, &bytes_read); - line_ptr += bytes_read; - - state_machine.check_line_address (cu, line_ptr, - lowpc - baseaddr, address); - state_machine.handle_set_address (baseaddr, address); - } - break; - case DW_LNE_define_file: - { - const char *cur_file; - unsigned int mod_time, length; - dir_index dindex; - - cur_file = read_direct_string (abfd, line_ptr, - &bytes_read); - line_ptr += bytes_read; - dindex = (dir_index) - read_unsigned_leb128 (abfd, line_ptr, &bytes_read); - line_ptr += bytes_read; - mod_time = - read_unsigned_leb128 (abfd, line_ptr, &bytes_read); - line_ptr += bytes_read; - length = - read_unsigned_leb128 (abfd, line_ptr, &bytes_read); - line_ptr += bytes_read; - lh->add_file_name (cur_file, dindex, mod_time, length); - } - break; - case DW_LNE_set_discriminator: - { - /* The discriminator is not interesting to the - debugger; just ignore it. We still need to - check its value though: - if there are consecutive entries for the same - (non-prologue) line we want to coalesce them. - PR 17276. */ - unsigned int discr - = read_unsigned_leb128 (abfd, line_ptr, &bytes_read); - line_ptr += bytes_read; - - state_machine.handle_set_discriminator (discr); - } - break; - default: - complaint (_("mangled .debug_line section")); - return; - } - /* Make sure that we parsed the extended op correctly. If e.g. - we expected a different address size than the producer used, - we may have read the wrong number of bytes. */ - if (line_ptr != extended_end) - { - complaint (_("mangled .debug_line section")); - return; - } - break; - case DW_LNS_copy: - state_machine.handle_copy (); - break; - case DW_LNS_advance_pc: - { - CORE_ADDR adjust - = read_unsigned_leb128 (abfd, line_ptr, &bytes_read); - line_ptr += bytes_read; - - state_machine.handle_advance_pc (adjust); - } - break; - case DW_LNS_advance_line: - { - int line_delta - = read_signed_leb128 (abfd, line_ptr, &bytes_read); - line_ptr += bytes_read; - - state_machine.handle_advance_line (line_delta); - } - break; - case DW_LNS_set_file: - { - file_name_index file - = (file_name_index) read_unsigned_leb128 (abfd, line_ptr, - &bytes_read); - line_ptr += bytes_read; - - state_machine.handle_set_file (file); - } - break; - case DW_LNS_set_column: - (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read); - line_ptr += bytes_read; - break; - case DW_LNS_negate_stmt: - state_machine.handle_negate_stmt (); - break; - case DW_LNS_set_basic_block: - break; - /* Add to the address register of the state machine the - address increment value corresponding to special opcode - 255. I.e., this value is scaled by the minimum - instruction length since special opcode 255 would have - scaled the increment. */ - case DW_LNS_const_add_pc: - state_machine.handle_const_add_pc (); - break; - case DW_LNS_fixed_advance_pc: - { - CORE_ADDR addr_adj = read_2_bytes (abfd, line_ptr); - line_ptr += 2; - - state_machine.handle_fixed_advance_pc (addr_adj); - } - break; - default: - { - /* Unknown standard opcode, ignore it. */ - int i; - - for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++) - { - (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read); - line_ptr += bytes_read; - } - } - } - } - - if (!end_sequence) - dwarf2_debug_line_missing_end_sequence_complaint (); - - /* We got a DW_LNE_end_sequence (or we ran off the end of the buffer, - in which case we still finish recording the last line). */ - state_machine.record_line (true); - } -} - -/* Decode the Line Number Program (LNP) for the given line_header - structure and CU. The actual information extracted and the type - of structures created from the LNP depends on the value of PST. - - 1. If PST is NULL, then this procedure uses the data from the program - to create all necessary symbol tables, and their linetables. - - 2. If PST is not NULL, this procedure reads the program to determine - the list of files included by the unit represented by PST, and - builds all the associated partial symbol tables. - - COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown. - It is used for relative paths in the line table. - NOTE: When processing partial symtabs (pst != NULL), - comp_dir == pst->dirname. - - NOTE: It is important that psymtabs have the same file name (via strcmp) - as the corresponding symtab. Since COMP_DIR is not used in the name of the - symtab we don't use it in the name of the psymtabs we create. - E.g. expand_line_sal requires this when finding psymtabs to expand. - A good testcase for this is mb-inline.exp. - - LOWPC is the lowest address in CU (or 0 if not known). - - Boolean DECODE_MAPPING specifies we need to fully decode .debug_line - for its PC<->lines mapping information. Otherwise only the filename - table is read in. */ - -static void -dwarf_decode_lines (struct line_header *lh, const char *comp_dir, - struct dwarf2_cu *cu, dwarf2_psymtab *pst, - CORE_ADDR lowpc, int decode_mapping) -{ - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - const int decode_for_pst_p = (pst != NULL); - - if (decode_mapping) - dwarf_decode_lines_1 (lh, cu, decode_for_pst_p, lowpc); - - if (decode_for_pst_p) - { - /* Now that we're done scanning the Line Header Program, we can - create the psymtab of each included file. */ - for (auto &file_entry : lh->file_names ()) - if (file_entry.included_p == 1) - { - gdb::unique_xmalloc_ptr<char> name_holder; - const char *include_name = - psymtab_include_file_name (lh, file_entry, pst, - comp_dir, &name_holder); - if (include_name != NULL) - dwarf2_create_include_psymtab (include_name, pst, objfile); - } - } - else - { - /* Make sure a symtab is created for every file, even files - which contain only variables (i.e. no code with associated - line numbers). */ - buildsym_compunit *builder = cu->get_builder (); - struct compunit_symtab *cust = builder->get_compunit_symtab (); - - for (auto &fe : lh->file_names ()) - { - dwarf2_start_subfile (cu, fe.name, fe.include_dir (lh)); - if (builder->get_current_subfile ()->symtab == NULL) - { - builder->get_current_subfile ()->symtab - = allocate_symtab (cust, - builder->get_current_subfile ()->name); - } - fe.symtab = builder->get_current_subfile ()->symtab; - } - } -} - -/* Start a subfile for DWARF. FILENAME is the name of the file and - DIRNAME the name of the source directory which contains FILENAME - or NULL if not known. - This routine tries to keep line numbers from identical absolute and - relative file names in a common subfile. - - Using the `list' example from the GDB testsuite, which resides in - /srcdir and compiling it with Irix6.2 cc in /compdir using a filename - of /srcdir/list0.c yields the following debugging information for list0.c: - - DW_AT_name: /srcdir/list0.c - DW_AT_comp_dir: /compdir - files.files[0].name: list0.h - files.files[0].dir: /srcdir - files.files[1].name: list0.c - files.files[1].dir: /srcdir - - The line number information for list0.c has to end up in a single - subfile, so that `break /srcdir/list0.c:1' works as expected. - start_subfile will ensure that this happens provided that we pass the - concatenation of files.files[1].dir and files.files[1].name as the - subfile's name. */ - -static void -dwarf2_start_subfile (struct dwarf2_cu *cu, const char *filename, - const char *dirname) -{ - gdb::unique_xmalloc_ptr<char> copy; - - /* In order not to lose the line information directory, - we concatenate it to the filename when it makes sense. - Note that the Dwarf3 standard says (speaking of filenames in line - information): ``The directory index is ignored for file names - that represent full path names''. Thus ignoring dirname in the - `else' branch below isn't an issue. */ - - if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL) - { - copy.reset (concat (dirname, SLASH_STRING, filename, (char *) NULL)); - filename = copy.get (); - } - - cu->get_builder ()->start_subfile (filename); -} - -/* Start a symtab for DWARF. NAME, COMP_DIR, LOW_PC are passed to the - buildsym_compunit constructor. */ - -struct compunit_symtab * -dwarf2_cu::start_symtab (const char *name, const char *comp_dir, - CORE_ADDR low_pc) -{ - gdb_assert (m_builder == nullptr); - - m_builder.reset (new struct buildsym_compunit - (per_cu->dwarf2_per_objfile->objfile, - name, comp_dir, language, low_pc)); - - list_in_scope = get_builder ()->get_file_symbols (); - - get_builder ()->record_debugformat ("DWARF 2"); - get_builder ()->record_producer (producer); - - processing_has_namespace_info = false; - - return get_builder ()->get_compunit_symtab (); -} - -static void -var_decode_location (struct attribute *attr, struct symbol *sym, - struct dwarf2_cu *cu) -{ - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - struct comp_unit_head *cu_header = &cu->header; - - /* NOTE drow/2003-01-30: There used to be a comment and some special - code here to turn a symbol with DW_AT_external and a - SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was - necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux - with some versions of binutils) where shared libraries could have - relocations against symbols in their debug information - the - minimal symbol would have the right address, but the debug info - would not. It's no longer necessary, because we will explicitly - apply relocations when we read in the debug information now. */ - - /* A DW_AT_location attribute with no contents indicates that a - variable has been optimized away. */ - if (attr->form_is_block () && DW_BLOCK (attr)->size == 0) - { - SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT; - return; - } - - /* Handle one degenerate form of location expression specially, to - preserve GDB's previous behavior when section offsets are - specified. If this is just a DW_OP_addr, DW_OP_addrx, or - DW_OP_GNU_addr_index then mark this symbol as LOC_STATIC. */ - - if (attr->form_is_block () - && ((DW_BLOCK (attr)->data[0] == DW_OP_addr - && DW_BLOCK (attr)->size == 1 + cu_header->addr_size) - || ((DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index - || DW_BLOCK (attr)->data[0] == DW_OP_addrx) - && (DW_BLOCK (attr)->size - == 1 + leb128_size (&DW_BLOCK (attr)->data[1]))))) - { - unsigned int dummy; - - if (DW_BLOCK (attr)->data[0] == DW_OP_addr) - SET_SYMBOL_VALUE_ADDRESS (sym, - read_address (objfile->obfd, - DW_BLOCK (attr)->data + 1, - cu, &dummy)); - else - SET_SYMBOL_VALUE_ADDRESS - (sym, read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, - &dummy)); - SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC; - fixup_symbol_section (sym, objfile); - SET_SYMBOL_VALUE_ADDRESS - (sym, - SYMBOL_VALUE_ADDRESS (sym) - + objfile->section_offsets[SYMBOL_SECTION (sym)]); - return; - } - - /* NOTE drow/2002-01-30: It might be worthwhile to have a static - expression evaluator, and use LOC_COMPUTED only when necessary - (i.e. when the value of a register or memory location is - referenced, or a thread-local block, etc.). Then again, it might - not be worthwhile. I'm assuming that it isn't unless performance - or memory numbers show me otherwise. */ - - dwarf2_symbol_mark_computed (attr, sym, cu, 0); - - if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist) - cu->has_loclist = true; -} - -/* Given a pointer to a DWARF information entry, figure out if we need - to make a symbol table entry for it, and if so, create a new entry - and return a pointer to it. - If TYPE is NULL, determine symbol type from the die, otherwise - used the passed type. - If SPACE is not NULL, use it to hold the new symbol. If it is - NULL, allocate a new symbol on the objfile's obstack. */ - -static struct symbol * -new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu, - struct symbol *space) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - struct objfile *objfile = dwarf2_per_objfile->objfile; - struct gdbarch *gdbarch = get_objfile_arch (objfile); - struct symbol *sym = NULL; - const char *name; - struct attribute *attr = NULL; - struct attribute *attr2 = NULL; - CORE_ADDR baseaddr; - struct pending **list_to_add = NULL; - - int inlined_func = (die->tag == DW_TAG_inlined_subroutine); - - baseaddr = objfile->text_section_offset (); - - name = dwarf2_name (die, cu); - if (name) - { - const char *linkagename; - int suppress_add = 0; - - if (space) - sym = space; - else - sym = allocate_symbol (objfile); - OBJSTAT (objfile, n_syms++); - - /* Cache this symbol's name and the name's demangled form (if any). */ - sym->set_language (cu->language, &objfile->objfile_obstack); - linkagename = dwarf2_physname (name, die, cu); - sym->compute_and_set_names (linkagename, false, objfile->per_bfd); - - /* Fortran does not have mangling standard and the mangling does differ - between gfortran, iFort etc. */ - if (cu->language == language_fortran - && symbol_get_demangled_name (sym) == NULL) - symbol_set_demangled_name (sym, - dwarf2_full_name (name, die, cu), - NULL); - - /* Default assumptions. - Use the passed type or decode it from the die. */ - SYMBOL_DOMAIN (sym) = VAR_DOMAIN; - SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT; - if (type != NULL) - SYMBOL_TYPE (sym) = type; - else - SYMBOL_TYPE (sym) = die_type (die, cu); - attr = dwarf2_attr (die, - inlined_func ? DW_AT_call_line : DW_AT_decl_line, - cu); - if (attr != nullptr) - { - SYMBOL_LINE (sym) = DW_UNSND (attr); - } - - attr = dwarf2_attr (die, - inlined_func ? DW_AT_call_file : DW_AT_decl_file, - cu); - if (attr != nullptr) - { - file_name_index file_index = (file_name_index) DW_UNSND (attr); - struct file_entry *fe; - - if (cu->line_header != NULL) - fe = cu->line_header->file_name_at (file_index); - else - fe = NULL; - - if (fe == NULL) - complaint (_("file index out of range")); - else - symbol_set_symtab (sym, fe->symtab); - } - - switch (die->tag) - { - case DW_TAG_label: - attr = dwarf2_attr (die, DW_AT_low_pc, cu); - if (attr != nullptr) - { - CORE_ADDR addr; - - addr = attr->value_as_address (); - addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + baseaddr); - SET_SYMBOL_VALUE_ADDRESS (sym, addr); - } - SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr; - SYMBOL_DOMAIN (sym) = LABEL_DOMAIN; - SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL; - add_symbol_to_list (sym, cu->list_in_scope); - break; - case DW_TAG_subprogram: - /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by - finish_block. */ - SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK; - attr2 = dwarf2_attr (die, DW_AT_external, cu); - if ((attr2 && (DW_UNSND (attr2) != 0)) - || cu->language == language_ada - || cu->language == language_fortran) - { - /* Subprograms marked external are stored as a global symbol. - Ada and Fortran subprograms, whether marked external or - not, are always stored as a global symbol, because we want - to be able to access them globally. For instance, we want - to be able to break on a nested subprogram without having - to specify the context. */ - list_to_add = cu->get_builder ()->get_global_symbols (); - } - else - { - list_to_add = cu->list_in_scope; - } - break; - case DW_TAG_inlined_subroutine: - /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by - finish_block. */ - SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK; - SYMBOL_INLINED (sym) = 1; - list_to_add = cu->list_in_scope; - break; - case DW_TAG_template_value_param: - suppress_add = 1; - /* Fall through. */ - case DW_TAG_constant: - case DW_TAG_variable: - case DW_TAG_member: - /* Compilation with minimal debug info may result in - variables with missing type entries. Change the - misleading `void' type to something sensible. */ - if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID) - SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_int; - - attr = dwarf2_attr (die, DW_AT_const_value, cu); - /* In the case of DW_TAG_member, we should only be called for - static const members. */ - if (die->tag == DW_TAG_member) - { - /* dwarf2_add_field uses die_is_declaration, - so we do the same. */ - gdb_assert (die_is_declaration (die, cu)); - gdb_assert (attr); - } - if (attr != nullptr) - { - dwarf2_const_value (attr, sym, cu); - attr2 = dwarf2_attr (die, DW_AT_external, cu); - if (!suppress_add) - { - if (attr2 && (DW_UNSND (attr2) != 0)) - list_to_add = cu->get_builder ()->get_global_symbols (); - else - list_to_add = cu->list_in_scope; - } - break; - } - attr = dwarf2_attr (die, DW_AT_location, cu); - if (attr != nullptr) - { - var_decode_location (attr, sym, cu); - attr2 = dwarf2_attr (die, DW_AT_external, cu); - - /* Fortran explicitly imports any global symbols to the local - scope by DW_TAG_common_block. */ - if (cu->language == language_fortran && die->parent - && die->parent->tag == DW_TAG_common_block) - attr2 = NULL; - - if (SYMBOL_CLASS (sym) == LOC_STATIC - && SYMBOL_VALUE_ADDRESS (sym) == 0 - && !dwarf2_per_objfile->has_section_at_zero) - { - /* When a static variable is eliminated by the linker, - the corresponding debug information is not stripped - out, but the variable address is set to null; - do not add such variables into symbol table. */ - } - else if (attr2 && (DW_UNSND (attr2) != 0)) - { - if (SYMBOL_CLASS (sym) == LOC_STATIC - && (objfile->flags & OBJF_MAINLINE) == 0 - && dwarf2_per_objfile->can_copy) - { - /* A global static variable might be subject to - copy relocation. We first check for a local - minsym, though, because maybe the symbol was - marked hidden, in which case this would not - apply. */ - bound_minimal_symbol found - = (lookup_minimal_symbol_linkage - (sym->linkage_name (), objfile)); - if (found.minsym != nullptr) - sym->maybe_copied = 1; - } - - /* A variable with DW_AT_external is never static, - but it may be block-scoped. */ - list_to_add - = ((cu->list_in_scope - == cu->get_builder ()->get_file_symbols ()) - ? cu->get_builder ()->get_global_symbols () - : cu->list_in_scope); - } - else - list_to_add = cu->list_in_scope; - } - else - { - /* We do not know the address of this symbol. - If it is an external symbol and we have type information - for it, enter the symbol as a LOC_UNRESOLVED symbol. - The address of the variable will then be determined from - the minimal symbol table whenever the variable is - referenced. */ - attr2 = dwarf2_attr (die, DW_AT_external, cu); - - /* Fortran explicitly imports any global symbols to the local - scope by DW_TAG_common_block. */ - if (cu->language == language_fortran && die->parent - && die->parent->tag == DW_TAG_common_block) - { - /* SYMBOL_CLASS doesn't matter here because - read_common_block is going to reset it. */ - if (!suppress_add) - list_to_add = cu->list_in_scope; - } - else if (attr2 && (DW_UNSND (attr2) != 0) - && dwarf2_attr (die, DW_AT_type, cu) != NULL) - { - /* A variable with DW_AT_external is never static, but it - may be block-scoped. */ - list_to_add - = ((cu->list_in_scope - == cu->get_builder ()->get_file_symbols ()) - ? cu->get_builder ()->get_global_symbols () - : cu->list_in_scope); - - SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED; - } - else if (!die_is_declaration (die, cu)) - { - /* Use the default LOC_OPTIMIZED_OUT class. */ - gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT); - if (!suppress_add) - list_to_add = cu->list_in_scope; - } - } - break; - case DW_TAG_formal_parameter: - { - /* If we are inside a function, mark this as an argument. If - not, we might be looking at an argument to an inlined function - when we do not have enough information to show inlined frames; - pretend it's a local variable in that case so that the user can - still see it. */ - struct context_stack *curr - = cu->get_builder ()->get_current_context_stack (); - if (curr != nullptr && curr->name != nullptr) - SYMBOL_IS_ARGUMENT (sym) = 1; - attr = dwarf2_attr (die, DW_AT_location, cu); - if (attr != nullptr) - { - var_decode_location (attr, sym, cu); - } - attr = dwarf2_attr (die, DW_AT_const_value, cu); - if (attr != nullptr) - { - dwarf2_const_value (attr, sym, cu); - } - - list_to_add = cu->list_in_scope; - } - break; - case DW_TAG_unspecified_parameters: - /* From varargs functions; gdb doesn't seem to have any - interest in this information, so just ignore it for now. - (FIXME?) */ - break; - case DW_TAG_template_type_param: - suppress_add = 1; - /* Fall through. */ - case DW_TAG_class_type: - case DW_TAG_interface_type: - case DW_TAG_structure_type: - case DW_TAG_union_type: - case DW_TAG_set_type: - case DW_TAG_enumeration_type: - SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF; - SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN; - - { - /* NOTE: carlton/2003-11-10: C++ class symbols shouldn't - really ever be static objects: otherwise, if you try - to, say, break of a class's method and you're in a file - which doesn't mention that class, it won't work unless - the check for all static symbols in lookup_symbol_aux - saves you. See the OtherFileClass tests in - gdb.c++/namespace.exp. */ - - if (!suppress_add) - { - buildsym_compunit *builder = cu->get_builder (); - list_to_add - = (cu->list_in_scope == builder->get_file_symbols () - && cu->language == language_cplus - ? builder->get_global_symbols () - : cu->list_in_scope); - - /* The semantics of C++ state that "struct foo { - ... }" also defines a typedef for "foo". */ - if (cu->language == language_cplus - || cu->language == language_ada - || cu->language == language_d - || cu->language == language_rust) - { - /* The symbol's name is already allocated along - with this objfile, so we don't need to - duplicate it for the type. */ - if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0) - TYPE_NAME (SYMBOL_TYPE (sym)) = sym->search_name (); - } - } - } - break; - case DW_TAG_typedef: - SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF; - SYMBOL_DOMAIN (sym) = VAR_DOMAIN; - list_to_add = cu->list_in_scope; - break; - case DW_TAG_base_type: - case DW_TAG_subrange_type: - SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF; - SYMBOL_DOMAIN (sym) = VAR_DOMAIN; - list_to_add = cu->list_in_scope; - break; - case DW_TAG_enumerator: - attr = dwarf2_attr (die, DW_AT_const_value, cu); - if (attr != nullptr) - { - dwarf2_const_value (attr, sym, cu); - } - { - /* NOTE: carlton/2003-11-10: See comment above in the - DW_TAG_class_type, etc. block. */ - - list_to_add - = (cu->list_in_scope == cu->get_builder ()->get_file_symbols () - && cu->language == language_cplus - ? cu->get_builder ()->get_global_symbols () - : cu->list_in_scope); - } - break; - case DW_TAG_imported_declaration: - case DW_TAG_namespace: - SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF; - list_to_add = cu->get_builder ()->get_global_symbols (); - break; - case DW_TAG_module: - SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF; - SYMBOL_DOMAIN (sym) = MODULE_DOMAIN; - list_to_add = cu->get_builder ()->get_global_symbols (); - break; - case DW_TAG_common_block: - SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK; - SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN; - add_symbol_to_list (sym, cu->list_in_scope); - break; - default: - /* Not a tag we recognize. Hopefully we aren't processing - trash data, but since we must specifically ignore things - we don't recognize, there is nothing else we should do at - this point. */ - complaint (_("unsupported tag: '%s'"), - dwarf_tag_name (die->tag)); - break; - } - - if (suppress_add) - { - sym->hash_next = objfile->template_symbols; - objfile->template_symbols = sym; - list_to_add = NULL; - } - - if (list_to_add != NULL) - add_symbol_to_list (sym, list_to_add); - - /* For the benefit of old versions of GCC, check for anonymous - namespaces based on the demangled name. */ - if (!cu->processing_has_namespace_info - && cu->language == language_cplus) - cp_scan_for_anonymous_namespaces (cu->get_builder (), sym, objfile); - } - return (sym); -} - -/* Given an attr with a DW_FORM_dataN value in host byte order, - zero-extend it as appropriate for the symbol's type. The DWARF - standard (v4) is not entirely clear about the meaning of using - DW_FORM_dataN for a constant with a signed type, where the type is - wider than the data. The conclusion of a discussion on the DWARF - list was that this is unspecified. We choose to always zero-extend - because that is the interpretation long in use by GCC. */ - -static gdb_byte * -dwarf2_const_value_data (const struct attribute *attr, struct obstack *obstack, - struct dwarf2_cu *cu, LONGEST *value, int bits) -{ - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ? - BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE; - LONGEST l = DW_UNSND (attr); - - if (bits < sizeof (*value) * 8) - { - l &= ((LONGEST) 1 << bits) - 1; - *value = l; - } - else if (bits == sizeof (*value) * 8) - *value = l; - else - { - gdb_byte *bytes = (gdb_byte *) obstack_alloc (obstack, bits / 8); - store_unsigned_integer (bytes, bits / 8, byte_order, l); - return bytes; - } - - return NULL; -} - -/* Read a constant value from an attribute. Either set *VALUE, or if - the value does not fit in *VALUE, set *BYTES - either already - allocated on the objfile obstack, or newly allocated on OBSTACK, - or, set *BATON, if we translated the constant to a location - expression. */ - -static void -dwarf2_const_value_attr (const struct attribute *attr, struct type *type, - const char *name, struct obstack *obstack, - struct dwarf2_cu *cu, - LONGEST *value, const gdb_byte **bytes, - struct dwarf2_locexpr_baton **baton) -{ - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - struct comp_unit_head *cu_header = &cu->header; - struct dwarf_block *blk; - enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ? - BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE); - - *value = 0; - *bytes = NULL; - *baton = NULL; - - switch (attr->form) - { - case DW_FORM_addr: - case DW_FORM_addrx: - case DW_FORM_GNU_addr_index: - { - gdb_byte *data; - - if (TYPE_LENGTH (type) != cu_header->addr_size) - dwarf2_const_value_length_mismatch_complaint (name, - cu_header->addr_size, - TYPE_LENGTH (type)); - /* Symbols of this form are reasonably rare, so we just - piggyback on the existing location code rather than writing - a new implementation of symbol_computed_ops. */ - *baton = XOBNEW (obstack, struct dwarf2_locexpr_baton); - (*baton)->per_cu = cu->per_cu; - gdb_assert ((*baton)->per_cu); - - (*baton)->size = 2 + cu_header->addr_size; - data = (gdb_byte *) obstack_alloc (obstack, (*baton)->size); - (*baton)->data = data; - - data[0] = DW_OP_addr; - store_unsigned_integer (&data[1], cu_header->addr_size, - byte_order, DW_ADDR (attr)); - data[cu_header->addr_size + 1] = DW_OP_stack_value; - } - break; - case DW_FORM_string: - case DW_FORM_strp: - case DW_FORM_strx: - case DW_FORM_GNU_str_index: - case DW_FORM_GNU_strp_alt: - /* DW_STRING is already allocated on the objfile obstack, point - directly to it. */ - *bytes = (const gdb_byte *) DW_STRING (attr); - break; - case DW_FORM_block1: - case DW_FORM_block2: - case DW_FORM_block4: - case DW_FORM_block: - case DW_FORM_exprloc: - case DW_FORM_data16: - blk = DW_BLOCK (attr); - if (TYPE_LENGTH (type) != blk->size) - dwarf2_const_value_length_mismatch_complaint (name, blk->size, - TYPE_LENGTH (type)); - *bytes = blk->data; - break; - - /* The DW_AT_const_value attributes are supposed to carry the - symbol's value "represented as it would be on the target - architecture." By the time we get here, it's already been - converted to host endianness, so we just need to sign- or - zero-extend it as appropriate. */ - case DW_FORM_data1: - *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8); - break; - case DW_FORM_data2: - *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16); - break; - case DW_FORM_data4: - *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32); - break; - case DW_FORM_data8: - *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64); - break; - - case DW_FORM_sdata: - case DW_FORM_implicit_const: - *value = DW_SND (attr); - break; - - case DW_FORM_udata: - *value = DW_UNSND (attr); - break; - - default: - complaint (_("unsupported const value attribute form: '%s'"), - dwarf_form_name (attr->form)); - *value = 0; - break; - } -} - - -/* Copy constant value from an attribute to a symbol. */ - -static void -dwarf2_const_value (const struct attribute *attr, struct symbol *sym, - struct dwarf2_cu *cu) -{ - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - LONGEST value; - const gdb_byte *bytes; - struct dwarf2_locexpr_baton *baton; - - dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym), - sym->print_name (), - &objfile->objfile_obstack, cu, - &value, &bytes, &baton); - - if (baton != NULL) - { - SYMBOL_LOCATION_BATON (sym) = baton; - SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index; - } - else if (bytes != NULL) - { - SYMBOL_VALUE_BYTES (sym) = bytes; - SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES; - } - else - { - SYMBOL_VALUE (sym) = value; - SYMBOL_ACLASS_INDEX (sym) = LOC_CONST; - } -} - -/* Return the type of the die in question using its DW_AT_type attribute. */ - -static struct type * -die_type (struct die_info *die, struct dwarf2_cu *cu) -{ - struct attribute *type_attr; - - type_attr = dwarf2_attr (die, DW_AT_type, cu); - if (!type_attr) - { - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - /* A missing DW_AT_type represents a void type. */ - return objfile_type (objfile)->builtin_void; - } - - return lookup_die_type (die, type_attr, cu); -} - -/* True iff CU's producer generates GNAT Ada auxiliary information - that allows to find parallel types through that information instead - of having to do expensive parallel lookups by type name. */ - -static int -need_gnat_info (struct dwarf2_cu *cu) -{ - /* Assume that the Ada compiler was GNAT, which always produces - the auxiliary information. */ - return (cu->language == language_ada); -} - -/* Return the auxiliary type of the die in question using its - DW_AT_GNAT_descriptive_type attribute. Returns NULL if the - attribute is not present. */ - -static struct type * -die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu) -{ - struct attribute *type_attr; - - type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu); - if (!type_attr) - return NULL; - - return lookup_die_type (die, type_attr, cu); -} - -/* If DIE has a descriptive_type attribute, then set the TYPE's - descriptive type accordingly. */ - -static void -set_descriptive_type (struct type *type, struct die_info *die, - struct dwarf2_cu *cu) -{ - struct type *descriptive_type = die_descriptive_type (die, cu); - - if (descriptive_type) - { - ALLOCATE_GNAT_AUX_TYPE (type); - TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type; - } -} - -/* Return the containing type of the die in question using its - DW_AT_containing_type attribute. */ - -static struct type * -die_containing_type (struct die_info *die, struct dwarf2_cu *cu) -{ - struct attribute *type_attr; - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - - type_attr = dwarf2_attr (die, DW_AT_containing_type, cu); - if (!type_attr) - error (_("Dwarf Error: Problem turning containing type into gdb type " - "[in module %s]"), objfile_name (objfile)); - - return lookup_die_type (die, type_attr, cu); -} - -/* Return an error marker type to use for the ill formed type in DIE/CU. */ - -static struct type * -build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - struct objfile *objfile = dwarf2_per_objfile->objfile; - char *saved; - - std::string message - = string_printf (_("<unknown type in %s, CU %s, DIE %s>"), - objfile_name (objfile), - sect_offset_str (cu->header.sect_off), - sect_offset_str (die->sect_off)); - saved = obstack_strdup (&objfile->objfile_obstack, message); - - return init_type (objfile, TYPE_CODE_ERROR, 0, saved); -} - -/* Look up the type of DIE in CU using its type attribute ATTR. - ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type, - DW_AT_containing_type. - If there is no type substitute an error marker. */ - -static struct type * -lookup_die_type (struct die_info *die, const struct attribute *attr, - struct dwarf2_cu *cu) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - struct objfile *objfile = dwarf2_per_objfile->objfile; - struct type *this_type; - - gdb_assert (attr->name == DW_AT_type - || attr->name == DW_AT_GNAT_descriptive_type - || attr->name == DW_AT_containing_type); - - /* First see if we have it cached. */ - - if (attr->form == DW_FORM_GNU_ref_alt) - { - struct dwarf2_per_cu_data *per_cu; - sect_offset sect_off = dwarf2_get_ref_die_offset (attr); - - per_cu = dwarf2_find_containing_comp_unit (sect_off, 1, - dwarf2_per_objfile); - this_type = get_die_type_at_offset (sect_off, per_cu); - } - else if (attr->form_is_ref ()) - { - sect_offset sect_off = dwarf2_get_ref_die_offset (attr); - - this_type = get_die_type_at_offset (sect_off, cu->per_cu); - } - else if (attr->form == DW_FORM_ref_sig8) - { - ULONGEST signature = DW_SIGNATURE (attr); - - return get_signatured_type (die, signature, cu); - } - else - { - complaint (_("Dwarf Error: Bad type attribute %s in DIE" - " at %s [in module %s]"), - dwarf_attr_name (attr->name), sect_offset_str (die->sect_off), - objfile_name (objfile)); - return build_error_marker_type (cu, die); - } - - /* If not cached we need to read it in. */ - - if (this_type == NULL) - { - struct die_info *type_die = NULL; - struct dwarf2_cu *type_cu = cu; - - if (attr->form_is_ref ()) - type_die = follow_die_ref (die, attr, &type_cu); - if (type_die == NULL) - return build_error_marker_type (cu, die); - /* If we find the type now, it's probably because the type came - from an inter-CU reference and the type's CU got expanded before - ours. */ - this_type = read_type_die (type_die, type_cu); - } - - /* If we still don't have a type use an error marker. */ - - if (this_type == NULL) - return build_error_marker_type (cu, die); - - return this_type; -} - -/* Return the type in DIE, CU. - Returns NULL for invalid types. - - This first does a lookup in die_type_hash, - and only reads the die in if necessary. - - NOTE: This can be called when reading in partial or full symbols. */ - -static struct type * -read_type_die (struct die_info *die, struct dwarf2_cu *cu) -{ - struct type *this_type; - - this_type = get_die_type (die, cu); - if (this_type) - return this_type; - - return read_type_die_1 (die, cu); -} - -/* Read the type in DIE, CU. - Returns NULL for invalid types. */ - -static struct type * -read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu) -{ - struct type *this_type = NULL; - - switch (die->tag) - { - case DW_TAG_class_type: - case DW_TAG_interface_type: - case DW_TAG_structure_type: - case DW_TAG_union_type: - this_type = read_structure_type (die, cu); - break; - case DW_TAG_enumeration_type: - this_type = read_enumeration_type (die, cu); - break; - case DW_TAG_subprogram: - case DW_TAG_subroutine_type: - case DW_TAG_inlined_subroutine: - this_type = read_subroutine_type (die, cu); - break; - case DW_TAG_array_type: - this_type = read_array_type (die, cu); - break; - case DW_TAG_set_type: - this_type = read_set_type (die, cu); - break; - case DW_TAG_pointer_type: - this_type = read_tag_pointer_type (die, cu); - break; - case DW_TAG_ptr_to_member_type: - this_type = read_tag_ptr_to_member_type (die, cu); - break; - case DW_TAG_reference_type: - this_type = read_tag_reference_type (die, cu, TYPE_CODE_REF); - break; - case DW_TAG_rvalue_reference_type: - this_type = read_tag_reference_type (die, cu, TYPE_CODE_RVALUE_REF); - break; - case DW_TAG_const_type: - this_type = read_tag_const_type (die, cu); - break; - case DW_TAG_volatile_type: - this_type = read_tag_volatile_type (die, cu); - break; - case DW_TAG_restrict_type: - this_type = read_tag_restrict_type (die, cu); - break; - case DW_TAG_string_type: - this_type = read_tag_string_type (die, cu); - break; - case DW_TAG_typedef: - this_type = read_typedef (die, cu); - break; - case DW_TAG_subrange_type: - this_type = read_subrange_type (die, cu); - break; - case DW_TAG_base_type: - this_type = read_base_type (die, cu); - break; - case DW_TAG_unspecified_type: - this_type = read_unspecified_type (die, cu); - break; - case DW_TAG_namespace: - this_type = read_namespace_type (die, cu); - break; - case DW_TAG_module: - this_type = read_module_type (die, cu); - break; - case DW_TAG_atomic_type: - this_type = read_tag_atomic_type (die, cu); - break; - default: - complaint (_("unexpected tag in read_type_die: '%s'"), - dwarf_tag_name (die->tag)); - break; - } - - return this_type; -} - -/* See if we can figure out if the class lives in a namespace. We do - this by looking for a member function; its demangled name will - contain namespace info, if there is any. - Return the computed name or NULL. - Space for the result is allocated on the objfile's obstack. - This is the full-die version of guess_partial_die_structure_name. - In this case we know DIE has no useful parent. */ - -static const char * -guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu) -{ - struct die_info *spec_die; - struct dwarf2_cu *spec_cu; - struct die_info *child; - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - - spec_cu = cu; - spec_die = die_specification (die, &spec_cu); - if (spec_die != NULL) - { - die = spec_die; - cu = spec_cu; - } - - for (child = die->child; - child != NULL; - child = child->sibling) - { - if (child->tag == DW_TAG_subprogram) - { - const char *linkage_name = dw2_linkage_name (child, cu); - - if (linkage_name != NULL) - { - gdb::unique_xmalloc_ptr<char> actual_name - (language_class_name_from_physname (cu->language_defn, - linkage_name)); - const char *name = NULL; - - if (actual_name != NULL) - { - const char *die_name = dwarf2_name (die, cu); - - if (die_name != NULL - && strcmp (die_name, actual_name.get ()) != 0) - { - /* Strip off the class name from the full name. - We want the prefix. */ - int die_name_len = strlen (die_name); - int actual_name_len = strlen (actual_name.get ()); - const char *ptr = actual_name.get (); - - /* Test for '::' as a sanity check. */ - if (actual_name_len > die_name_len + 2 - && ptr[actual_name_len - die_name_len - 1] == ':') - name = obstack_strndup ( - &objfile->per_bfd->storage_obstack, - ptr, actual_name_len - die_name_len - 2); - } - } - return name; - } - } - } - - return NULL; -} - -/* GCC might emit a nameless typedef that has a linkage name. Determine the - prefix part in such case. See - http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */ - -static const char * -anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu) -{ - struct attribute *attr; - const char *base; - - if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type - && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type) - return NULL; - - if (dwarf2_string_attr (die, DW_AT_name, cu) != NULL) - return NULL; - - attr = dw2_linkage_name_attr (die, cu); - if (attr == NULL || DW_STRING (attr) == NULL) - return NULL; - - /* dwarf2_name had to be already called. */ - gdb_assert (DW_STRING_IS_CANONICAL (attr)); - - /* Strip the base name, keep any leading namespaces/classes. */ - base = strrchr (DW_STRING (attr), ':'); - if (base == NULL || base == DW_STRING (attr) || base[-1] != ':') - return ""; - - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - return obstack_strndup (&objfile->per_bfd->storage_obstack, - DW_STRING (attr), - &base[-1] - DW_STRING (attr)); -} - -/* Return the name of the namespace/class that DIE is defined within, - or "" if we can't tell. The caller should not xfree the result. - - For example, if we're within the method foo() in the following - code: - - namespace N { - class C { - void foo () { - } - }; - } - - then determine_prefix on foo's die will return "N::C". */ - -static const char * -determine_prefix (struct die_info *die, struct dwarf2_cu *cu) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - struct die_info *parent, *spec_die; - struct dwarf2_cu *spec_cu; - struct type *parent_type; - const char *retval; - - if (cu->language != language_cplus - && cu->language != language_fortran && cu->language != language_d - && cu->language != language_rust) - return ""; - - retval = anonymous_struct_prefix (die, cu); - if (retval) - return retval; - - /* We have to be careful in the presence of DW_AT_specification. - For example, with GCC 3.4, given the code - - namespace N { - void foo() { - // Definition of N::foo. - } - } - - then we'll have a tree of DIEs like this: - - 1: DW_TAG_compile_unit - 2: DW_TAG_namespace // N - 3: DW_TAG_subprogram // declaration of N::foo - 4: DW_TAG_subprogram // definition of N::foo - DW_AT_specification // refers to die #3 - - Thus, when processing die #4, we have to pretend that we're in - the context of its DW_AT_specification, namely the contex of die - #3. */ - spec_cu = cu; - spec_die = die_specification (die, &spec_cu); - if (spec_die == NULL) - parent = die->parent; - else - { - parent = spec_die->parent; - cu = spec_cu; - } - - if (parent == NULL) - return ""; - else if (parent->building_fullname) - { - const char *name; - const char *parent_name; - - /* It has been seen on RealView 2.2 built binaries, - DW_TAG_template_type_param types actually _defined_ as - children of the parent class: - - enum E {}; - template class <class Enum> Class{}; - Class<enum E> class_e; - - 1: DW_TAG_class_type (Class) - 2: DW_TAG_enumeration_type (E) - 3: DW_TAG_enumerator (enum1:0) - 3: DW_TAG_enumerator (enum2:1) - ... - 2: DW_TAG_template_type_param - DW_AT_type DW_FORM_ref_udata (E) - - Besides being broken debug info, it can put GDB into an - infinite loop. Consider: - - When we're building the full name for Class<E>, we'll start - at Class, and go look over its template type parameters, - finding E. We'll then try to build the full name of E, and - reach here. We're now trying to build the full name of E, - and look over the parent DIE for containing scope. In the - broken case, if we followed the parent DIE of E, we'd again - find Class, and once again go look at its template type - arguments, etc., etc. Simply don't consider such parent die - as source-level parent of this die (it can't be, the language - doesn't allow it), and break the loop here. */ - name = dwarf2_name (die, cu); - parent_name = dwarf2_name (parent, cu); - complaint (_("template param type '%s' defined within parent '%s'"), - name ? name : "<unknown>", - parent_name ? parent_name : "<unknown>"); - return ""; - } - else - switch (parent->tag) - { - case DW_TAG_namespace: - parent_type = read_type_die (parent, cu); - /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus - DW_TAG_namespace DIEs with a name of "::" for the global namespace. - Work around this problem here. */ - if (cu->language == language_cplus - && strcmp (TYPE_NAME (parent_type), "::") == 0) - return ""; - /* We give a name to even anonymous namespaces. */ - return TYPE_NAME (parent_type); - case DW_TAG_class_type: - case DW_TAG_interface_type: - case DW_TAG_structure_type: - case DW_TAG_union_type: - case DW_TAG_module: - parent_type = read_type_die (parent, cu); - if (TYPE_NAME (parent_type) != NULL) - return TYPE_NAME (parent_type); - else - /* An anonymous structure is only allowed non-static data - members; no typedefs, no member functions, et cetera. - So it does not need a prefix. */ - return ""; - case DW_TAG_compile_unit: - case DW_TAG_partial_unit: - /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */ - if (cu->language == language_cplus - && !dwarf2_per_objfile->types.empty () - && die->child != NULL - && (die->tag == DW_TAG_class_type - || die->tag == DW_TAG_structure_type - || die->tag == DW_TAG_union_type)) - { - const char *name = guess_full_die_structure_name (die, cu); - if (name != NULL) - return name; - } - return ""; - case DW_TAG_subprogram: - /* Nested subroutines in Fortran get a prefix with the name - of the parent's subroutine. */ - if (cu->language == language_fortran) - { - if ((die->tag == DW_TAG_subprogram) - && (dwarf2_name (parent, cu) != NULL)) - return dwarf2_name (parent, cu); - } - return determine_prefix (parent, cu); - case DW_TAG_enumeration_type: - parent_type = read_type_die (parent, cu); - if (TYPE_DECLARED_CLASS (parent_type)) - { - if (TYPE_NAME (parent_type) != NULL) - return TYPE_NAME (parent_type); - return ""; - } - /* Fall through. */ - default: - return determine_prefix (parent, cu); - } -} - -/* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX - with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then - simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform - an obconcat, otherwise allocate storage for the result. The CU argument is - used to determine the language and hence, the appropriate separator. */ - -#define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */ - -static char * -typename_concat (struct obstack *obs, const char *prefix, const char *suffix, - int physname, struct dwarf2_cu *cu) -{ - const char *lead = ""; - const char *sep; - - if (suffix == NULL || suffix[0] == '\0' - || prefix == NULL || prefix[0] == '\0') - sep = ""; - else if (cu->language == language_d) - { - /* For D, the 'main' function could be defined in any module, but it - should never be prefixed. */ - if (strcmp (suffix, "D main") == 0) - { - prefix = ""; - sep = ""; - } - else - sep = "."; - } - else if (cu->language == language_fortran && physname) - { - /* This is gfortran specific mangling. Normally DW_AT_linkage_name or - DW_AT_MIPS_linkage_name is preferred and used instead. */ - - lead = "__"; - sep = "_MOD_"; - } - else - sep = "::"; - - if (prefix == NULL) - prefix = ""; - if (suffix == NULL) - suffix = ""; - - if (obs == NULL) - { - char *retval - = ((char *) - xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1)); - - strcpy (retval, lead); - strcat (retval, prefix); - strcat (retval, sep); - strcat (retval, suffix); - return retval; - } - else - { - /* We have an obstack. */ - return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL); - } -} - -/* Return sibling of die, NULL if no sibling. */ - -static struct die_info * -sibling_die (struct die_info *die) -{ - return die->sibling; -} - -/* Get name of a die, return NULL if not found. */ - -static const char * -dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu, - struct obstack *obstack) -{ - if (name && cu->language == language_cplus) - { - std::string canon_name = cp_canonicalize_string (name); - - if (!canon_name.empty ()) - { - if (canon_name != name) - name = obstack_strdup (obstack, canon_name); - } - } - - return name; -} - -/* Get name of a die, return NULL if not found. - Anonymous namespaces are converted to their magic string. */ - -static const char * -dwarf2_name (struct die_info *die, struct dwarf2_cu *cu) -{ - struct attribute *attr; - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - - attr = dwarf2_attr (die, DW_AT_name, cu); - if ((!attr || !DW_STRING (attr)) - && die->tag != DW_TAG_namespace - && die->tag != DW_TAG_class_type - && die->tag != DW_TAG_interface_type - && die->tag != DW_TAG_structure_type - && die->tag != DW_TAG_union_type) - return NULL; - - switch (die->tag) - { - case DW_TAG_compile_unit: - case DW_TAG_partial_unit: - /* Compilation units have a DW_AT_name that is a filename, not - a source language identifier. */ - case DW_TAG_enumeration_type: - case DW_TAG_enumerator: - /* These tags always have simple identifiers already; no need - to canonicalize them. */ - return DW_STRING (attr); - - case DW_TAG_namespace: - if (attr != NULL && DW_STRING (attr) != NULL) - return DW_STRING (attr); - return CP_ANONYMOUS_NAMESPACE_STR; - - case DW_TAG_class_type: - case DW_TAG_interface_type: - case DW_TAG_structure_type: - case DW_TAG_union_type: - /* Some GCC versions emit spurious DW_AT_name attributes for unnamed - structures or unions. These were of the form "._%d" in GCC 4.1, - or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3 - and GCC 4.4. We work around this problem by ignoring these. */ - if (attr && DW_STRING (attr) - && (startswith (DW_STRING (attr), "._") - || startswith (DW_STRING (attr), "<anonymous"))) - return NULL; - - /* GCC might emit a nameless typedef that has a linkage name. See - http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */ - if (!attr || DW_STRING (attr) == NULL) - { - attr = dw2_linkage_name_attr (die, cu); - if (attr == NULL || DW_STRING (attr) == NULL) - return NULL; - - /* Avoid demangling DW_STRING (attr) the second time on a second - call for the same DIE. */ - if (!DW_STRING_IS_CANONICAL (attr)) - { - gdb::unique_xmalloc_ptr<char> demangled - (gdb_demangle (DW_STRING (attr), DMGL_TYPES)); - - const char *base; - - /* FIXME: we already did this for the partial symbol... */ - DW_STRING (attr) - = obstack_strdup (&objfile->per_bfd->storage_obstack, - demangled.get ()); - DW_STRING_IS_CANONICAL (attr) = 1; - - /* Strip any leading namespaces/classes, keep only the base name. - DW_AT_name for named DIEs does not contain the prefixes. */ - base = strrchr (DW_STRING (attr), ':'); - if (base && base > DW_STRING (attr) && base[-1] == ':') - return &base[1]; - else - return DW_STRING (attr); - } - } - break; - - default: - break; - } - - if (!DW_STRING_IS_CANONICAL (attr)) - { - DW_STRING (attr) - = dwarf2_canonicalize_name (DW_STRING (attr), cu, - &objfile->per_bfd->storage_obstack); - DW_STRING_IS_CANONICAL (attr) = 1; - } - return DW_STRING (attr); -} - -/* Return the die that this die in an extension of, or NULL if there - is none. *EXT_CU is the CU containing DIE on input, and the CU - containing the return value on output. */ - -static struct die_info * -dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu) -{ - struct attribute *attr; - - attr = dwarf2_attr (die, DW_AT_extension, *ext_cu); - if (attr == NULL) - return NULL; - - return follow_die_ref (die, attr, ext_cu); -} - -/* A convenience function that returns an "unknown" DWARF name, - including the value of V. STR is the name of the entity being - printed, e.g., "TAG". */ - -static const char * -dwarf_unknown (const char *str, unsigned v) -{ - char *cell = get_print_cell (); - xsnprintf (cell, PRINT_CELL_SIZE, "DW_%s_<unknown: %u>", str, v); - return cell; -} - -/* Convert a DIE tag into its string name. */ - -static const char * -dwarf_tag_name (unsigned tag) -{ - const char *name = get_DW_TAG_name (tag); - - if (name == NULL) - return dwarf_unknown ("TAG", tag); - - return name; -} - -/* Convert a DWARF attribute code into its string name. */ - -static const char * -dwarf_attr_name (unsigned attr) -{ - const char *name; - -#ifdef MIPS /* collides with DW_AT_HP_block_index */ - if (attr == DW_AT_MIPS_fde) - return "DW_AT_MIPS_fde"; -#else - if (attr == DW_AT_HP_block_index) - return "DW_AT_HP_block_index"; -#endif - - name = get_DW_AT_name (attr); - - if (name == NULL) - return dwarf_unknown ("AT", attr); - - return name; -} - -/* Convert a unit type to corresponding DW_UT name. */ - -static const char * -dwarf_unit_type_name (int unit_type) { - switch (unit_type) - { - case 0x01: - return "DW_UT_compile (0x01)"; - case 0x02: - return "DW_UT_type (0x02)"; - case 0x03: - return "DW_UT_partial (0x03)"; - case 0x04: - return "DW_UT_skeleton (0x04)"; - case 0x05: - return "DW_UT_split_compile (0x05)"; - case 0x06: - return "DW_UT_split_type (0x06)"; - case 0x80: - return "DW_UT_lo_user (0x80)"; - case 0xff: - return "DW_UT_hi_user (0xff)"; - default: - return nullptr; - } -} - -/* Convert a DWARF value form code into its string name. */ - -static const char * -dwarf_form_name (unsigned form) -{ - const char *name = get_DW_FORM_name (form); - - if (name == NULL) - return dwarf_unknown ("FORM", form); - - return name; -} - -static const char * -dwarf_bool_name (unsigned mybool) -{ - if (mybool) - return "TRUE"; - else - return "FALSE"; -} - -/* Convert a DWARF type code into its string name. */ - -static const char * -dwarf_type_encoding_name (unsigned enc) -{ - const char *name = get_DW_ATE_name (enc); - - if (name == NULL) - return dwarf_unknown ("ATE", enc); - - return name; -} - -static void -dump_die_shallow (struct ui_file *f, int indent, struct die_info *die) -{ - unsigned int i; - - print_spaces (indent, f); - fprintf_unfiltered (f, "Die: %s (abbrev %d, offset %s)\n", - dwarf_tag_name (die->tag), die->abbrev, - sect_offset_str (die->sect_off)); - - if (die->parent != NULL) - { - print_spaces (indent, f); - fprintf_unfiltered (f, " parent at offset: %s\n", - sect_offset_str (die->parent->sect_off)); - } - - print_spaces (indent, f); - fprintf_unfiltered (f, " has children: %s\n", - dwarf_bool_name (die->child != NULL)); - - print_spaces (indent, f); - fprintf_unfiltered (f, " attributes:\n"); - - for (i = 0; i < die->num_attrs; ++i) - { - print_spaces (indent, f); - fprintf_unfiltered (f, " %s (%s) ", - dwarf_attr_name (die->attrs[i].name), - dwarf_form_name (die->attrs[i].form)); - - switch (die->attrs[i].form) - { - case DW_FORM_addr: - case DW_FORM_addrx: - case DW_FORM_GNU_addr_index: - fprintf_unfiltered (f, "address: "); - fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f); - break; - case DW_FORM_block2: - case DW_FORM_block4: - case DW_FORM_block: - case DW_FORM_block1: - fprintf_unfiltered (f, "block: size %s", - pulongest (DW_BLOCK (&die->attrs[i])->size)); - break; - case DW_FORM_exprloc: - fprintf_unfiltered (f, "expression: size %s", - pulongest (DW_BLOCK (&die->attrs[i])->size)); - break; - case DW_FORM_data16: - fprintf_unfiltered (f, "constant of 16 bytes"); - break; - case DW_FORM_ref_addr: - fprintf_unfiltered (f, "ref address: "); - fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f); - break; - case DW_FORM_GNU_ref_alt: - fprintf_unfiltered (f, "alt ref address: "); - fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f); - break; - case DW_FORM_ref1: - case DW_FORM_ref2: - case DW_FORM_ref4: - case DW_FORM_ref8: - case DW_FORM_ref_udata: - fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)", - (long) (DW_UNSND (&die->attrs[i]))); - break; - case DW_FORM_data1: - case DW_FORM_data2: - case DW_FORM_data4: - case DW_FORM_data8: - case DW_FORM_udata: - case DW_FORM_sdata: - fprintf_unfiltered (f, "constant: %s", - pulongest (DW_UNSND (&die->attrs[i]))); - break; - case DW_FORM_sec_offset: - fprintf_unfiltered (f, "section offset: %s", - pulongest (DW_UNSND (&die->attrs[i]))); - break; - case DW_FORM_ref_sig8: - fprintf_unfiltered (f, "signature: %s", - hex_string (DW_SIGNATURE (&die->attrs[i]))); - break; - case DW_FORM_string: - case DW_FORM_strp: - case DW_FORM_line_strp: - case DW_FORM_strx: - case DW_FORM_GNU_str_index: - case DW_FORM_GNU_strp_alt: - fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)", - DW_STRING (&die->attrs[i]) - ? DW_STRING (&die->attrs[i]) : "", - DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not"); - break; - case DW_FORM_flag: - if (DW_UNSND (&die->attrs[i])) - fprintf_unfiltered (f, "flag: TRUE"); - else - fprintf_unfiltered (f, "flag: FALSE"); - break; - case DW_FORM_flag_present: - fprintf_unfiltered (f, "flag: TRUE"); - break; - case DW_FORM_indirect: - /* The reader will have reduced the indirect form to - the "base form" so this form should not occur. */ - fprintf_unfiltered (f, - "unexpected attribute form: DW_FORM_indirect"); - break; - case DW_FORM_implicit_const: - fprintf_unfiltered (f, "constant: %s", - plongest (DW_SND (&die->attrs[i]))); - break; - default: - fprintf_unfiltered (f, "unsupported attribute form: %d.", - die->attrs[i].form); - break; - } - fprintf_unfiltered (f, "\n"); - } -} - -static void -dump_die_for_error (struct die_info *die) -{ - dump_die_shallow (gdb_stderr, 0, die); -} - -static void -dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die) -{ - int indent = level * 4; - - gdb_assert (die != NULL); - - if (level >= max_level) - return; - - dump_die_shallow (f, indent, die); - - if (die->child != NULL) - { - print_spaces (indent, f); - fprintf_unfiltered (f, " Children:"); - if (level + 1 < max_level) - { - fprintf_unfiltered (f, "\n"); - dump_die_1 (f, level + 1, max_level, die->child); - } - else - { - fprintf_unfiltered (f, - " [not printed, max nesting level reached]\n"); - } - } - - if (die->sibling != NULL && level > 0) - { - dump_die_1 (f, level, max_level, die->sibling); - } -} - -/* This is called from the pdie macro in gdbinit.in. - It's not static so gcc will keep a copy callable from gdb. */ - -void -dump_die (struct die_info *die, int max_level) -{ - dump_die_1 (gdb_stdlog, 0, max_level, die); -} - -static void -store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu) -{ - void **slot; - - slot = htab_find_slot_with_hash (cu->die_hash, die, - to_underlying (die->sect_off), - INSERT); - - *slot = die; -} - -/* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the - required kind. */ - -static sect_offset -dwarf2_get_ref_die_offset (const struct attribute *attr) -{ - if (attr->form_is_ref ()) - return (sect_offset) DW_UNSND (attr); - - complaint (_("unsupported die ref attribute form: '%s'"), - dwarf_form_name (attr->form)); - return {}; -} - -/* Return the constant value held by ATTR. Return DEFAULT_VALUE if - * the value held by the attribute is not constant. */ - -static LONGEST -dwarf2_get_attr_constant_value (const struct attribute *attr, int default_value) -{ - if (attr->form == DW_FORM_sdata || attr->form == DW_FORM_implicit_const) - return DW_SND (attr); - else if (attr->form == DW_FORM_udata - || attr->form == DW_FORM_data1 - || attr->form == DW_FORM_data2 - || attr->form == DW_FORM_data4 - || attr->form == DW_FORM_data8) - return DW_UNSND (attr); - else - { - /* For DW_FORM_data16 see attribute::form_is_constant. */ - complaint (_("Attribute value is not a constant (%s)"), - dwarf_form_name (attr->form)); - return default_value; - } -} - -/* Follow reference or signature attribute ATTR of SRC_DIE. - On entry *REF_CU is the CU of SRC_DIE. - On exit *REF_CU is the CU of the result. */ - -static struct die_info * -follow_die_ref_or_sig (struct die_info *src_die, const struct attribute *attr, - struct dwarf2_cu **ref_cu) -{ - struct die_info *die; - - if (attr->form_is_ref ()) - die = follow_die_ref (src_die, attr, ref_cu); - else if (attr->form == DW_FORM_ref_sig8) - die = follow_die_sig (src_die, attr, ref_cu); - else - { - dump_die_for_error (src_die); - error (_("Dwarf Error: Expected reference attribute [in module %s]"), - objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile)); - } - - return die; -} - -/* Follow reference OFFSET. - On entry *REF_CU is the CU of the source die referencing OFFSET. - On exit *REF_CU is the CU of the result. - Returns NULL if OFFSET is invalid. */ - -static struct die_info * -follow_die_offset (sect_offset sect_off, int offset_in_dwz, - struct dwarf2_cu **ref_cu) -{ - struct die_info temp_die; - struct dwarf2_cu *target_cu, *cu = *ref_cu; - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - - gdb_assert (cu->per_cu != NULL); - - target_cu = cu; - - if (cu->per_cu->is_debug_types) - { - /* .debug_types CUs cannot reference anything outside their CU. - If they need to, they have to reference a signatured type via - DW_FORM_ref_sig8. */ - if (!offset_in_cu_p (&cu->header, sect_off)) - return NULL; - } - else if (offset_in_dwz != cu->per_cu->is_dwz - || !offset_in_cu_p (&cu->header, sect_off)) - { - struct dwarf2_per_cu_data *per_cu; - - per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz, - dwarf2_per_objfile); - - /* If necessary, add it to the queue and load its DIEs. */ - if (maybe_queue_comp_unit (cu, per_cu, cu->language)) - load_full_comp_unit (per_cu, false, cu->language); - - target_cu = per_cu->cu; - } - else if (cu->dies == NULL) - { - /* We're loading full DIEs during partial symbol reading. */ - gdb_assert (dwarf2_per_objfile->reading_partial_symbols); - load_full_comp_unit (cu->per_cu, false, language_minimal); - } - - *ref_cu = target_cu; - temp_die.sect_off = sect_off; - - if (target_cu != cu) - target_cu->ancestor = cu; - - return (struct die_info *) htab_find_with_hash (target_cu->die_hash, - &temp_die, - to_underlying (sect_off)); -} - -/* Follow reference attribute ATTR of SRC_DIE. - On entry *REF_CU is the CU of SRC_DIE. - On exit *REF_CU is the CU of the result. */ - -static struct die_info * -follow_die_ref (struct die_info *src_die, const struct attribute *attr, - struct dwarf2_cu **ref_cu) -{ - sect_offset sect_off = dwarf2_get_ref_die_offset (attr); - struct dwarf2_cu *cu = *ref_cu; - struct die_info *die; - - die = follow_die_offset (sect_off, - (attr->form == DW_FORM_GNU_ref_alt - || cu->per_cu->is_dwz), - ref_cu); - if (!die) - error (_("Dwarf Error: Cannot find DIE at %s referenced from DIE " - "at %s [in module %s]"), - sect_offset_str (sect_off), sect_offset_str (src_die->sect_off), - objfile_name (cu->per_cu->dwarf2_per_objfile->objfile)); - - return die; -} - -/* Return DWARF block referenced by DW_AT_location of DIE at SECT_OFF at PER_CU. - Returned value is intended for DW_OP_call*. Returned - dwarf2_locexpr_baton->data has lifetime of - PER_CU->DWARF2_PER_OBJFILE->OBJFILE. */ - -struct dwarf2_locexpr_baton -dwarf2_fetch_die_loc_sect_off (sect_offset sect_off, - struct dwarf2_per_cu_data *per_cu, - CORE_ADDR (*get_frame_pc) (void *baton), - void *baton, bool resolve_abstract_p) -{ - struct dwarf2_cu *cu; - struct die_info *die; - struct attribute *attr; - struct dwarf2_locexpr_baton retval; - struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile; - struct objfile *objfile = dwarf2_per_objfile->objfile; - - if (per_cu->cu == NULL) - load_cu (per_cu, false); - cu = per_cu->cu; - if (cu == NULL) - { - /* We shouldn't get here for a dummy CU, but don't crash on the user. - Instead just throw an error, not much else we can do. */ - error (_("Dwarf Error: Dummy CU at %s referenced in module %s"), - sect_offset_str (sect_off), objfile_name (objfile)); - } - - die = follow_die_offset (sect_off, per_cu->is_dwz, &cu); - if (!die) - error (_("Dwarf Error: Cannot find DIE at %s referenced in module %s"), - sect_offset_str (sect_off), objfile_name (objfile)); - - attr = dwarf2_attr (die, DW_AT_location, cu); - if (!attr && resolve_abstract_p - && (dwarf2_per_objfile->abstract_to_concrete.find (die->sect_off) - != dwarf2_per_objfile->abstract_to_concrete.end ())) - { - CORE_ADDR pc = (*get_frame_pc) (baton); - CORE_ADDR baseaddr = objfile->text_section_offset (); - struct gdbarch *gdbarch = get_objfile_arch (objfile); - - for (const auto &cand_off - : dwarf2_per_objfile->abstract_to_concrete[die->sect_off]) - { - struct dwarf2_cu *cand_cu = cu; - struct die_info *cand - = follow_die_offset (cand_off, per_cu->is_dwz, &cand_cu); - if (!cand - || !cand->parent - || cand->parent->tag != DW_TAG_subprogram) - continue; - - CORE_ADDR pc_low, pc_high; - get_scope_pc_bounds (cand->parent, &pc_low, &pc_high, cu); - if (pc_low == ((CORE_ADDR) -1)) - continue; - pc_low = gdbarch_adjust_dwarf2_addr (gdbarch, pc_low + baseaddr); - pc_high = gdbarch_adjust_dwarf2_addr (gdbarch, pc_high + baseaddr); - if (!(pc_low <= pc && pc < pc_high)) - continue; - - die = cand; - attr = dwarf2_attr (die, DW_AT_location, cu); - break; - } - } - - if (!attr) - { - /* DWARF: "If there is no such attribute, then there is no effect.". - DATA is ignored if SIZE is 0. */ - - retval.data = NULL; - retval.size = 0; - } - else if (attr->form_is_section_offset ()) - { - struct dwarf2_loclist_baton loclist_baton; - CORE_ADDR pc = (*get_frame_pc) (baton); - size_t size; - - fill_in_loclist_baton (cu, &loclist_baton, attr); - - retval.data = dwarf2_find_location_expression (&loclist_baton, - &size, pc); - retval.size = size; - } - else - { - if (!attr->form_is_block ()) - error (_("Dwarf Error: DIE at %s referenced in module %s " - "is neither DW_FORM_block* nor DW_FORM_exprloc"), - sect_offset_str (sect_off), objfile_name (objfile)); - - retval.data = DW_BLOCK (attr)->data; - retval.size = DW_BLOCK (attr)->size; - } - retval.per_cu = cu->per_cu; - - age_cached_comp_units (dwarf2_per_objfile); - - return retval; -} - -/* Like dwarf2_fetch_die_loc_sect_off, but take a CU - offset. */ - -struct dwarf2_locexpr_baton -dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu, - struct dwarf2_per_cu_data *per_cu, - CORE_ADDR (*get_frame_pc) (void *baton), - void *baton) -{ - sect_offset sect_off = per_cu->sect_off + to_underlying (offset_in_cu); - - return dwarf2_fetch_die_loc_sect_off (sect_off, per_cu, get_frame_pc, baton); -} - -/* Write a constant of a given type as target-ordered bytes into - OBSTACK. */ - -static const gdb_byte * -write_constant_as_bytes (struct obstack *obstack, - enum bfd_endian byte_order, - struct type *type, - ULONGEST value, - LONGEST *len) -{ - gdb_byte *result; - - *len = TYPE_LENGTH (type); - result = (gdb_byte *) obstack_alloc (obstack, *len); - store_unsigned_integer (result, *len, byte_order, value); - - return result; -} - -/* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a - pointer to the constant bytes and set LEN to the length of the - data. If memory is needed, allocate it on OBSTACK. If the DIE - does not have a DW_AT_const_value, return NULL. */ - -const gdb_byte * -dwarf2_fetch_constant_bytes (sect_offset sect_off, - struct dwarf2_per_cu_data *per_cu, - struct obstack *obstack, - LONGEST *len) -{ - struct dwarf2_cu *cu; - struct die_info *die; - struct attribute *attr; - const gdb_byte *result = NULL; - struct type *type; - LONGEST value; - enum bfd_endian byte_order; - struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile; - - if (per_cu->cu == NULL) - load_cu (per_cu, false); - cu = per_cu->cu; - if (cu == NULL) - { - /* We shouldn't get here for a dummy CU, but don't crash on the user. - Instead just throw an error, not much else we can do. */ - error (_("Dwarf Error: Dummy CU at %s referenced in module %s"), - sect_offset_str (sect_off), objfile_name (objfile)); - } - - die = follow_die_offset (sect_off, per_cu->is_dwz, &cu); - if (!die) - error (_("Dwarf Error: Cannot find DIE at %s referenced in module %s"), - sect_offset_str (sect_off), objfile_name (objfile)); - - attr = dwarf2_attr (die, DW_AT_const_value, cu); - if (attr == NULL) - return NULL; - - byte_order = (bfd_big_endian (objfile->obfd) - ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE); - - switch (attr->form) - { - case DW_FORM_addr: - case DW_FORM_addrx: - case DW_FORM_GNU_addr_index: - { - gdb_byte *tem; - - *len = cu->header.addr_size; - tem = (gdb_byte *) obstack_alloc (obstack, *len); - store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr)); - result = tem; - } - break; - case DW_FORM_string: - case DW_FORM_strp: - case DW_FORM_strx: - case DW_FORM_GNU_str_index: - case DW_FORM_GNU_strp_alt: - /* DW_STRING is already allocated on the objfile obstack, point - directly to it. */ - result = (const gdb_byte *) DW_STRING (attr); - *len = strlen (DW_STRING (attr)); - break; - case DW_FORM_block1: - case DW_FORM_block2: - case DW_FORM_block4: - case DW_FORM_block: - case DW_FORM_exprloc: - case DW_FORM_data16: - result = DW_BLOCK (attr)->data; - *len = DW_BLOCK (attr)->size; - break; - - /* The DW_AT_const_value attributes are supposed to carry the - symbol's value "represented as it would be on the target - architecture." By the time we get here, it's already been - converted to host endianness, so we just need to sign- or - zero-extend it as appropriate. */ - case DW_FORM_data1: - type = die_type (die, cu); - result = dwarf2_const_value_data (attr, obstack, cu, &value, 8); - if (result == NULL) - result = write_constant_as_bytes (obstack, byte_order, - type, value, len); - break; - case DW_FORM_data2: - type = die_type (die, cu); - result = dwarf2_const_value_data (attr, obstack, cu, &value, 16); - if (result == NULL) - result = write_constant_as_bytes (obstack, byte_order, - type, value, len); - break; - case DW_FORM_data4: - type = die_type (die, cu); - result = dwarf2_const_value_data (attr, obstack, cu, &value, 32); - if (result == NULL) - result = write_constant_as_bytes (obstack, byte_order, - type, value, len); - break; - case DW_FORM_data8: - type = die_type (die, cu); - result = dwarf2_const_value_data (attr, obstack, cu, &value, 64); - if (result == NULL) - result = write_constant_as_bytes (obstack, byte_order, - type, value, len); - break; - - case DW_FORM_sdata: - case DW_FORM_implicit_const: - type = die_type (die, cu); - result = write_constant_as_bytes (obstack, byte_order, - type, DW_SND (attr), len); - break; - - case DW_FORM_udata: - type = die_type (die, cu); - result = write_constant_as_bytes (obstack, byte_order, - type, DW_UNSND (attr), len); - break; - - default: - complaint (_("unsupported const value attribute form: '%s'"), - dwarf_form_name (attr->form)); - break; - } - - return result; -} - -/* Return the type of the die at OFFSET in PER_CU. Return NULL if no - valid type for this die is found. */ - -struct type * -dwarf2_fetch_die_type_sect_off (sect_offset sect_off, - struct dwarf2_per_cu_data *per_cu) -{ - struct dwarf2_cu *cu; - struct die_info *die; - - if (per_cu->cu == NULL) - load_cu (per_cu, false); - cu = per_cu->cu; - if (!cu) - return NULL; - - die = follow_die_offset (sect_off, per_cu->is_dwz, &cu); - if (!die) - return NULL; - - return die_type (die, cu); -} - -/* Return the type of the DIE at DIE_OFFSET in the CU named by - PER_CU. */ - -struct type * -dwarf2_get_die_type (cu_offset die_offset, - struct dwarf2_per_cu_data *per_cu) -{ - sect_offset die_offset_sect = per_cu->sect_off + to_underlying (die_offset); - return get_die_type_at_offset (die_offset_sect, per_cu); -} - -/* Follow type unit SIG_TYPE referenced by SRC_DIE. - On entry *REF_CU is the CU of SRC_DIE. - On exit *REF_CU is the CU of the result. - Returns NULL if the referenced DIE isn't found. */ - -static struct die_info * -follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type, - struct dwarf2_cu **ref_cu) -{ - struct die_info temp_die; - struct dwarf2_cu *sig_cu, *cu = *ref_cu; - struct die_info *die; - - /* While it might be nice to assert sig_type->type == NULL here, - we can get here for DW_AT_imported_declaration where we need - the DIE not the type. */ - - /* If necessary, add it to the queue and load its DIEs. */ - - if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal)) - read_signatured_type (sig_type); - - sig_cu = sig_type->per_cu.cu; - gdb_assert (sig_cu != NULL); - gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0); - temp_die.sect_off = sig_type->type_offset_in_section; - die = (struct die_info *) htab_find_with_hash (sig_cu->die_hash, &temp_die, - to_underlying (temp_die.sect_off)); - if (die) - { - struct dwarf2_per_objfile *dwarf2_per_objfile - = (*ref_cu)->per_cu->dwarf2_per_objfile; - - /* For .gdb_index version 7 keep track of included TUs. - http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */ - if (dwarf2_per_objfile->index_table != NULL - && dwarf2_per_objfile->index_table->version <= 7) - { - (*ref_cu)->per_cu->imported_symtabs_push (sig_cu->per_cu); - } - - *ref_cu = sig_cu; - if (sig_cu != cu) - sig_cu->ancestor = cu; - - return die; - } - - return NULL; -} - -/* Follow signatured type referenced by ATTR in SRC_DIE. - On entry *REF_CU is the CU of SRC_DIE. - On exit *REF_CU is the CU of the result. - The result is the DIE of the type. - If the referenced type cannot be found an error is thrown. */ - -static struct die_info * -follow_die_sig (struct die_info *src_die, const struct attribute *attr, - struct dwarf2_cu **ref_cu) -{ - ULONGEST signature = DW_SIGNATURE (attr); - struct signatured_type *sig_type; - struct die_info *die; - - gdb_assert (attr->form == DW_FORM_ref_sig8); - - sig_type = lookup_signatured_type (*ref_cu, signature); - /* sig_type will be NULL if the signatured type is missing from - the debug info. */ - if (sig_type == NULL) - { - error (_("Dwarf Error: Cannot find signatured DIE %s referenced" - " from DIE at %s [in module %s]"), - hex_string (signature), sect_offset_str (src_die->sect_off), - objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile)); - } - - die = follow_die_sig_1 (src_die, sig_type, ref_cu); - if (die == NULL) - { - dump_die_for_error (src_die); - error (_("Dwarf Error: Problem reading signatured DIE %s referenced" - " from DIE at %s [in module %s]"), - hex_string (signature), sect_offset_str (src_die->sect_off), - objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile)); - } - - return die; -} - -/* Get the type specified by SIGNATURE referenced in DIE/CU, - reading in and processing the type unit if necessary. */ - -static struct type * -get_signatured_type (struct die_info *die, ULONGEST signature, - struct dwarf2_cu *cu) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - struct signatured_type *sig_type; - struct dwarf2_cu *type_cu; - struct die_info *type_die; - struct type *type; - - sig_type = lookup_signatured_type (cu, signature); - /* sig_type will be NULL if the signatured type is missing from - the debug info. */ - if (sig_type == NULL) - { - complaint (_("Dwarf Error: Cannot find signatured DIE %s referenced" - " from DIE at %s [in module %s]"), - hex_string (signature), sect_offset_str (die->sect_off), - objfile_name (dwarf2_per_objfile->objfile)); - return build_error_marker_type (cu, die); - } - - /* If we already know the type we're done. */ - if (sig_type->type != NULL) - return sig_type->type; - - type_cu = cu; - type_die = follow_die_sig_1 (die, sig_type, &type_cu); - if (type_die != NULL) - { - /* N.B. We need to call get_die_type to ensure only one type for this DIE - is created. This is important, for example, because for c++ classes - we need TYPE_NAME set which is only done by new_symbol. Blech. */ - type = read_type_die (type_die, type_cu); - if (type == NULL) - { - complaint (_("Dwarf Error: Cannot build signatured type %s" - " referenced from DIE at %s [in module %s]"), - hex_string (signature), sect_offset_str (die->sect_off), - objfile_name (dwarf2_per_objfile->objfile)); - type = build_error_marker_type (cu, die); - } - } - else - { - complaint (_("Dwarf Error: Problem reading signatured DIE %s referenced" - " from DIE at %s [in module %s]"), - hex_string (signature), sect_offset_str (die->sect_off), - objfile_name (dwarf2_per_objfile->objfile)); - type = build_error_marker_type (cu, die); - } - sig_type->type = type; - - return type; -} - -/* Get the type specified by the DW_AT_signature ATTR in DIE/CU, - reading in and processing the type unit if necessary. */ - -static struct type * -get_DW_AT_signature_type (struct die_info *die, const struct attribute *attr, - struct dwarf2_cu *cu) /* ARI: editCase function */ -{ - /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */ - if (attr->form_is_ref ()) - { - struct dwarf2_cu *type_cu = cu; - struct die_info *type_die = follow_die_ref (die, attr, &type_cu); - - return read_type_die (type_die, type_cu); - } - else if (attr->form == DW_FORM_ref_sig8) - { - return get_signatured_type (die, DW_SIGNATURE (attr), cu); - } - else - { - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - - complaint (_("Dwarf Error: DW_AT_signature has bad form %s in DIE" - " at %s [in module %s]"), - dwarf_form_name (attr->form), sect_offset_str (die->sect_off), - objfile_name (dwarf2_per_objfile->objfile)); - return build_error_marker_type (cu, die); - } -} - -/* Load the DIEs associated with type unit PER_CU into memory. */ - -static void -load_full_type_unit (struct dwarf2_per_cu_data *per_cu) -{ - struct signatured_type *sig_type; - - /* Caller is responsible for ensuring type_unit_groups don't get here. */ - gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu)); - - /* We have the per_cu, but we need the signatured_type. - Fortunately this is an easy translation. */ - gdb_assert (per_cu->is_debug_types); - sig_type = (struct signatured_type *) per_cu; - - gdb_assert (per_cu->cu == NULL); - - read_signatured_type (sig_type); - - gdb_assert (per_cu->cu != NULL); -} - -/* Read in a signatured type and build its CU and DIEs. - If the type is a stub for the real type in a DWO file, - read in the real type from the DWO file as well. */ - -static void -read_signatured_type (struct signatured_type *sig_type) -{ - struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu; - - gdb_assert (per_cu->is_debug_types); - gdb_assert (per_cu->cu == NULL); - - cutu_reader reader (per_cu, NULL, 0, 1, false); - - if (!reader.dummy_p) - { - struct dwarf2_cu *cu = reader.cu; - const gdb_byte *info_ptr = reader.info_ptr; - - gdb_assert (cu->die_hash == NULL); - cu->die_hash = - htab_create_alloc_ex (cu->header.length / 12, - die_hash, - die_eq, - NULL, - &cu->comp_unit_obstack, - hashtab_obstack_allocate, - dummy_obstack_deallocate); - - if (reader.has_children) - reader.comp_unit_die->child - = read_die_and_siblings (&reader, info_ptr, &info_ptr, - reader.comp_unit_die); - cu->dies = reader.comp_unit_die; - /* comp_unit_die is not stored in die_hash, no need. */ - - /* We try not to read any attributes in this function, because - not all CUs needed for references have been loaded yet, and - symbol table processing isn't initialized. But we have to - set the CU language, or we won't be able to build types - correctly. Similarly, if we do not read the producer, we can - not apply producer-specific interpretation. */ - prepare_one_comp_unit (cu, cu->dies, language_minimal); - } - - sig_type->per_cu.tu_read = 1; -} - -/* Decode simple location descriptions. - Given a pointer to a dwarf block that defines a location, compute - the location and return the value. - - NOTE drow/2003-11-18: This function is called in two situations - now: for the address of static or global variables (partial symbols - only) and for offsets into structures which are expected to be - (more or less) constant. The partial symbol case should go away, - and only the constant case should remain. That will let this - function complain more accurately. A few special modes are allowed - without complaint for global variables (for instance, global - register values and thread-local values). - - A location description containing no operations indicates that the - object is optimized out. The return value is 0 for that case. - FIXME drow/2003-11-16: No callers check for this case any more; soon all - callers will only want a very basic result and this can become a - complaint. - - Note that stack[0] is unused except as a default error return. */ - -static CORE_ADDR -decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu) -{ - struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile; - size_t i; - size_t size = blk->size; - const gdb_byte *data = blk->data; - CORE_ADDR stack[64]; - int stacki; - unsigned int bytes_read, unsnd; - gdb_byte op; - - i = 0; - stacki = 0; - stack[stacki] = 0; - stack[++stacki] = 0; - - while (i < size) - { - op = data[i++]; - switch (op) - { - case DW_OP_lit0: - case DW_OP_lit1: - case DW_OP_lit2: - case DW_OP_lit3: - case DW_OP_lit4: - case DW_OP_lit5: - case DW_OP_lit6: - case DW_OP_lit7: - case DW_OP_lit8: - case DW_OP_lit9: - case DW_OP_lit10: - case DW_OP_lit11: - case DW_OP_lit12: - case DW_OP_lit13: - case DW_OP_lit14: - case DW_OP_lit15: - case DW_OP_lit16: - case DW_OP_lit17: - case DW_OP_lit18: - case DW_OP_lit19: - case DW_OP_lit20: - case DW_OP_lit21: - case DW_OP_lit22: - case DW_OP_lit23: - case DW_OP_lit24: - case DW_OP_lit25: - case DW_OP_lit26: - case DW_OP_lit27: - case DW_OP_lit28: - case DW_OP_lit29: - case DW_OP_lit30: - case DW_OP_lit31: - stack[++stacki] = op - DW_OP_lit0; - break; - - case DW_OP_reg0: - case DW_OP_reg1: - case DW_OP_reg2: - case DW_OP_reg3: - case DW_OP_reg4: - case DW_OP_reg5: - case DW_OP_reg6: - case DW_OP_reg7: - case DW_OP_reg8: - case DW_OP_reg9: - case DW_OP_reg10: - case DW_OP_reg11: - case DW_OP_reg12: - case DW_OP_reg13: - case DW_OP_reg14: - case DW_OP_reg15: - case DW_OP_reg16: - case DW_OP_reg17: - case DW_OP_reg18: - case DW_OP_reg19: - case DW_OP_reg20: - case DW_OP_reg21: - case DW_OP_reg22: - case DW_OP_reg23: - case DW_OP_reg24: - case DW_OP_reg25: - case DW_OP_reg26: - case DW_OP_reg27: - case DW_OP_reg28: - case DW_OP_reg29: - case DW_OP_reg30: - case DW_OP_reg31: - stack[++stacki] = op - DW_OP_reg0; - if (i < size) - dwarf2_complex_location_expr_complaint (); - break; - - case DW_OP_regx: - unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read); - i += bytes_read; - stack[++stacki] = unsnd; - if (i < size) - dwarf2_complex_location_expr_complaint (); - break; - - case DW_OP_addr: - stack[++stacki] = read_address (objfile->obfd, &data[i], - cu, &bytes_read); - i += bytes_read; - break; - - case DW_OP_const1u: - stack[++stacki] = read_1_byte (objfile->obfd, &data[i]); - i += 1; - break; - - case DW_OP_const1s: - stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]); - i += 1; - break; - - case DW_OP_const2u: - stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]); - i += 2; - break; - - case DW_OP_const2s: - stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]); - i += 2; - break; - - case DW_OP_const4u: - stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]); - i += 4; - break; - - case DW_OP_const4s: - stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]); - i += 4; - break; - - case DW_OP_const8u: - stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]); - i += 8; - break; - - case DW_OP_constu: - stack[++stacki] = read_unsigned_leb128 (NULL, (data + i), - &bytes_read); - i += bytes_read; - break; - - case DW_OP_consts: - stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read); - i += bytes_read; - break; - - case DW_OP_dup: - stack[stacki + 1] = stack[stacki]; - stacki++; - break; - - case DW_OP_plus: - stack[stacki - 1] += stack[stacki]; - stacki--; - break; - - case DW_OP_plus_uconst: - stack[stacki] += read_unsigned_leb128 (NULL, (data + i), - &bytes_read); - i += bytes_read; - break; - - case DW_OP_minus: - stack[stacki - 1] -= stack[stacki]; - stacki--; - break; - - case DW_OP_deref: - /* If we're not the last op, then we definitely can't encode - this using GDB's address_class enum. This is valid for partial - global symbols, although the variable's address will be bogus - in the psymtab. */ - if (i < size) - dwarf2_complex_location_expr_complaint (); - break; - - case DW_OP_GNU_push_tls_address: - case DW_OP_form_tls_address: - /* The top of the stack has the offset from the beginning - of the thread control block at which the variable is located. */ - /* Nothing should follow this operator, so the top of stack would - be returned. */ - /* This is valid for partial global symbols, but the variable's - address will be bogus in the psymtab. Make it always at least - non-zero to not look as a variable garbage collected by linker - which have DW_OP_addr 0. */ - if (i < size) - dwarf2_complex_location_expr_complaint (); - stack[stacki]++; - break; - - case DW_OP_GNU_uninit: - break; - - case DW_OP_addrx: - case DW_OP_GNU_addr_index: - case DW_OP_GNU_const_index: - stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i], - &bytes_read); - i += bytes_read; - break; - - default: - { - const char *name = get_DW_OP_name (op); - - if (name) - complaint (_("unsupported stack op: '%s'"), - name); - else - complaint (_("unsupported stack op: '%02x'"), - op); - } - - return (stack[stacki]); - } - - /* Enforce maximum stack depth of SIZE-1 to avoid writing - outside of the allocated space. Also enforce minimum>0. */ - if (stacki >= ARRAY_SIZE (stack) - 1) - { - complaint (_("location description stack overflow")); - return 0; - } - - if (stacki <= 0) - { - complaint (_("location description stack underflow")); - return 0; - } - } - return (stack[stacki]); -} - -/* memory allocation interface */ - -static struct dwarf_block * -dwarf_alloc_block (struct dwarf2_cu *cu) -{ - return XOBNEW (&cu->comp_unit_obstack, struct dwarf_block); -} - -static struct die_info * -dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs) -{ - struct die_info *die; - size_t size = sizeof (struct die_info); - - if (num_attrs > 1) - size += (num_attrs - 1) * sizeof (struct attribute); - - die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size); - memset (die, 0, sizeof (struct die_info)); - return (die); -} - - -/* Macro support. */ - -/* Return file name relative to the compilation directory of file number I in - *LH's file name table. The result is allocated using xmalloc; the caller is - responsible for freeing it. */ - -static char * -file_file_name (int file, struct line_header *lh) -{ - /* Is the file number a valid index into the line header's file name - table? Remember that file numbers start with one, not zero. */ - if (lh->is_valid_file_index (file)) - { - const file_entry *fe = lh->file_name_at (file); - - if (!IS_ABSOLUTE_PATH (fe->name)) - { - const char *dir = fe->include_dir (lh); - if (dir != NULL) - return concat (dir, SLASH_STRING, fe->name, (char *) NULL); - } - return xstrdup (fe->name); - } - else - { - /* The compiler produced a bogus file number. We can at least - record the macro definitions made in the file, even if we - won't be able to find the file by name. */ - char fake_name[80]; - - xsnprintf (fake_name, sizeof (fake_name), - "<bad macro file number %d>", file); - - complaint (_("bad file number in macro information (%d)"), - file); - - return xstrdup (fake_name); - } -} - -/* Return the full name of file number I in *LH's file name table. - Use COMP_DIR as the name of the current directory of the - compilation. The result is allocated using xmalloc; the caller is - responsible for freeing it. */ -static char * -file_full_name (int file, struct line_header *lh, const char *comp_dir) -{ - /* Is the file number a valid index into the line header's file name - table? Remember that file numbers start with one, not zero. */ - if (lh->is_valid_file_index (file)) - { - char *relative = file_file_name (file, lh); - - if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL) - return relative; - return reconcat (relative, comp_dir, SLASH_STRING, - relative, (char *) NULL); - } - else - return file_file_name (file, lh); -} - - -static struct macro_source_file * -macro_start_file (struct dwarf2_cu *cu, - int file, int line, - struct macro_source_file *current_file, - struct line_header *lh) -{ - /* File name relative to the compilation directory of this source file. */ - char *file_name = file_file_name (file, lh); - - if (! current_file) - { - /* Note: We don't create a macro table for this compilation unit - at all until we actually get a filename. */ - struct macro_table *macro_table = cu->get_builder ()->get_macro_table (); - - /* If we have no current file, then this must be the start_file - directive for the compilation unit's main source file. */ - current_file = macro_set_main (macro_table, file_name); - macro_define_special (macro_table); - } - else - current_file = macro_include (current_file, line, file_name); - - xfree (file_name); - - return current_file; -} - -static const char * -consume_improper_spaces (const char *p, const char *body) -{ - if (*p == ' ') - { - complaint (_("macro definition contains spaces " - "in formal argument list:\n`%s'"), - body); - - while (*p == ' ') - p++; - } - - return p; -} - - -static void -parse_macro_definition (struct macro_source_file *file, int line, - const char *body) -{ - const char *p; - - /* The body string takes one of two forms. For object-like macro - definitions, it should be: - - <macro name> " " <definition> - - For function-like macro definitions, it should be: - - <macro name> "() " <definition> - or - <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition> - - Spaces may appear only where explicitly indicated, and in the - <definition>. - - The Dwarf 2 spec says that an object-like macro's name is always - followed by a space, but versions of GCC around March 2002 omit - the space when the macro's definition is the empty string. - - The Dwarf 2 spec says that there should be no spaces between the - formal arguments in a function-like macro's formal argument list, - but versions of GCC around March 2002 include spaces after the - commas. */ - - - /* Find the extent of the macro name. The macro name is terminated - by either a space or null character (for an object-like macro) or - an opening paren (for a function-like macro). */ - for (p = body; *p; p++) - if (*p == ' ' || *p == '(') - break; - - if (*p == ' ' || *p == '\0') - { - /* It's an object-like macro. */ - int name_len = p - body; - std::string name (body, name_len); - const char *replacement; - - if (*p == ' ') - replacement = body + name_len + 1; - else - { - dwarf2_macro_malformed_definition_complaint (body); - replacement = body + name_len; - } - - macro_define_object (file, line, name.c_str (), replacement); - } - else if (*p == '(') - { - /* It's a function-like macro. */ - std::string name (body, p - body); - int argc = 0; - int argv_size = 1; - char **argv = XNEWVEC (char *, argv_size); - - p++; - - p = consume_improper_spaces (p, body); - - /* Parse the formal argument list. */ - while (*p && *p != ')') - { - /* Find the extent of the current argument name. */ - const char *arg_start = p; - - while (*p && *p != ',' && *p != ')' && *p != ' ') - p++; - - if (! *p || p == arg_start) - dwarf2_macro_malformed_definition_complaint (body); - else - { - /* Make sure argv has room for the new argument. */ - if (argc >= argv_size) - { - argv_size *= 2; - argv = XRESIZEVEC (char *, argv, argv_size); - } - - argv[argc++] = savestring (arg_start, p - arg_start); - } - - p = consume_improper_spaces (p, body); - - /* Consume the comma, if present. */ - if (*p == ',') - { - p++; - - p = consume_improper_spaces (p, body); - } - } - - if (*p == ')') - { - p++; - - if (*p == ' ') - /* Perfectly formed definition, no complaints. */ - macro_define_function (file, line, name.c_str (), - argc, (const char **) argv, - p + 1); - else if (*p == '\0') - { - /* Complain, but do define it. */ - dwarf2_macro_malformed_definition_complaint (body); - macro_define_function (file, line, name.c_str (), - argc, (const char **) argv, - p); - } - else - /* Just complain. */ - dwarf2_macro_malformed_definition_complaint (body); - } - else - /* Just complain. */ - dwarf2_macro_malformed_definition_complaint (body); - - { - int i; - - for (i = 0; i < argc; i++) - xfree (argv[i]); - } - xfree (argv); - } - else - dwarf2_macro_malformed_definition_complaint (body); -} - -/* Skip some bytes from BYTES according to the form given in FORM. - Returns the new pointer. */ - -static const gdb_byte * -skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end, - enum dwarf_form form, - unsigned int offset_size, - struct dwarf2_section_info *section) -{ - unsigned int bytes_read; - - switch (form) - { - case DW_FORM_data1: - case DW_FORM_flag: - ++bytes; - break; - - case DW_FORM_data2: - bytes += 2; - break; - - case DW_FORM_data4: - bytes += 4; - break; - - case DW_FORM_data8: - bytes += 8; - break; - - case DW_FORM_data16: - bytes += 16; - break; - - case DW_FORM_string: - read_direct_string (abfd, bytes, &bytes_read); - bytes += bytes_read; - break; - - case DW_FORM_sec_offset: - case DW_FORM_strp: - case DW_FORM_GNU_strp_alt: - bytes += offset_size; - break; - - case DW_FORM_block: - bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read); - bytes += bytes_read; - break; - - case DW_FORM_block1: - bytes += 1 + read_1_byte (abfd, bytes); - break; - case DW_FORM_block2: - bytes += 2 + read_2_bytes (abfd, bytes); - break; - case DW_FORM_block4: - bytes += 4 + read_4_bytes (abfd, bytes); - break; - - case DW_FORM_addrx: - case DW_FORM_sdata: - case DW_FORM_strx: - case DW_FORM_udata: - case DW_FORM_GNU_addr_index: - case DW_FORM_GNU_str_index: - bytes = gdb_skip_leb128 (bytes, buffer_end); - if (bytes == NULL) - { - dwarf2_section_buffer_overflow_complaint (section); - return NULL; - } - break; - - case DW_FORM_implicit_const: - break; - - default: - { - complaint (_("invalid form 0x%x in `%s'"), - form, section->get_name ()); - return NULL; - } - } - - return bytes; -} - -/* A helper for dwarf_decode_macros that handles skipping an unknown - opcode. Returns an updated pointer to the macro data buffer; or, - on error, issues a complaint and returns NULL. */ - -static const gdb_byte * -skip_unknown_opcode (unsigned int opcode, - const gdb_byte **opcode_definitions, - const gdb_byte *mac_ptr, const gdb_byte *mac_end, - bfd *abfd, - unsigned int offset_size, - struct dwarf2_section_info *section) -{ - unsigned int bytes_read, i; - unsigned long arg; - const gdb_byte *defn; - - if (opcode_definitions[opcode] == NULL) - { - complaint (_("unrecognized DW_MACFINO opcode 0x%x"), - opcode); - return NULL; - } - - defn = opcode_definitions[opcode]; - arg = read_unsigned_leb128 (abfd, defn, &bytes_read); - defn += bytes_read; - - for (i = 0; i < arg; ++i) - { - mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end, - (enum dwarf_form) defn[i], offset_size, - section); - if (mac_ptr == NULL) - { - /* skip_form_bytes already issued the complaint. */ - return NULL; - } - } - - return mac_ptr; -} - -/* A helper function which parses the header of a macro section. - If the macro section is the extended (for now called "GNU") type, - then this updates *OFFSET_SIZE. Returns a pointer to just after - the header, or issues a complaint and returns NULL on error. */ - -static const gdb_byte * -dwarf_parse_macro_header (const gdb_byte **opcode_definitions, - bfd *abfd, - const gdb_byte *mac_ptr, - unsigned int *offset_size, - int section_is_gnu) -{ - memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *)); - - if (section_is_gnu) - { - unsigned int version, flags; - - version = read_2_bytes (abfd, mac_ptr); - if (version != 4 && version != 5) - { - complaint (_("unrecognized version `%d' in .debug_macro section"), - version); - return NULL; - } - mac_ptr += 2; - - flags = read_1_byte (abfd, mac_ptr); - ++mac_ptr; - *offset_size = (flags & 1) ? 8 : 4; - - if ((flags & 2) != 0) - /* We don't need the line table offset. */ - mac_ptr += *offset_size; - - /* Vendor opcode descriptions. */ - if ((flags & 4) != 0) - { - unsigned int i, count; - - count = read_1_byte (abfd, mac_ptr); - ++mac_ptr; - for (i = 0; i < count; ++i) - { - unsigned int opcode, bytes_read; - unsigned long arg; - - opcode = read_1_byte (abfd, mac_ptr); - ++mac_ptr; - opcode_definitions[opcode] = mac_ptr; - arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); - mac_ptr += bytes_read; - mac_ptr += arg; - } - } - } - - return mac_ptr; -} - -/* A helper for dwarf_decode_macros that handles the GNU extensions, - including DW_MACRO_import. */ - -static void -dwarf_decode_macro_bytes (struct dwarf2_cu *cu, - bfd *abfd, - const gdb_byte *mac_ptr, const gdb_byte *mac_end, - struct macro_source_file *current_file, - struct line_header *lh, - struct dwarf2_section_info *section, - int section_is_gnu, int section_is_dwz, - unsigned int offset_size, - htab_t include_hash) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - struct objfile *objfile = dwarf2_per_objfile->objfile; - enum dwarf_macro_record_type macinfo_type; - int at_commandline; - const gdb_byte *opcode_definitions[256]; - - mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr, - &offset_size, section_is_gnu); - if (mac_ptr == NULL) - { - /* We already issued a complaint. */ - return; - } - - /* Determines if GDB is still before first DW_MACINFO_start_file. If true - GDB is still reading the definitions from command line. First - DW_MACINFO_start_file will need to be ignored as it was already executed - to create CURRENT_FILE for the main source holding also the command line - definitions. On first met DW_MACINFO_start_file this flag is reset to - normally execute all the remaining DW_MACINFO_start_file macinfos. */ - - at_commandline = 1; - - do - { - /* Do we at least have room for a macinfo type byte? */ - if (mac_ptr >= mac_end) - { - dwarf2_section_buffer_overflow_complaint (section); - break; - } - - macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr); - mac_ptr++; - - /* Note that we rely on the fact that the corresponding GNU and - DWARF constants are the same. */ - DIAGNOSTIC_PUSH - DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES - switch (macinfo_type) - { - /* A zero macinfo type indicates the end of the macro - information. */ - case 0: - break; - - case DW_MACRO_define: - case DW_MACRO_undef: - case DW_MACRO_define_strp: - case DW_MACRO_undef_strp: - case DW_MACRO_define_sup: - case DW_MACRO_undef_sup: - { - unsigned int bytes_read; - int line; - const char *body; - int is_define; - - line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); - mac_ptr += bytes_read; - - if (macinfo_type == DW_MACRO_define - || macinfo_type == DW_MACRO_undef) - { - body = read_direct_string (abfd, mac_ptr, &bytes_read); - mac_ptr += bytes_read; - } - else - { - LONGEST str_offset; - - str_offset = read_offset_1 (abfd, mac_ptr, offset_size); - mac_ptr += offset_size; - - if (macinfo_type == DW_MACRO_define_sup - || macinfo_type == DW_MACRO_undef_sup - || section_is_dwz) - { - struct dwz_file *dwz - = dwarf2_get_dwz_file (dwarf2_per_objfile); - - body = read_indirect_string_from_dwz (objfile, - dwz, str_offset); - } - else - body = read_indirect_string_at_offset (dwarf2_per_objfile, - abfd, str_offset); - } - - is_define = (macinfo_type == DW_MACRO_define - || macinfo_type == DW_MACRO_define_strp - || macinfo_type == DW_MACRO_define_sup); - if (! current_file) - { - /* DWARF violation as no main source is present. */ - complaint (_("debug info with no main source gives macro %s " - "on line %d: %s"), - is_define ? _("definition") : _("undefinition"), - line, body); - break; - } - if ((line == 0 && !at_commandline) - || (line != 0 && at_commandline)) - complaint (_("debug info gives %s macro %s with %s line %d: %s"), - at_commandline ? _("command-line") : _("in-file"), - is_define ? _("definition") : _("undefinition"), - line == 0 ? _("zero") : _("non-zero"), line, body); - - if (body == NULL) - { - /* Fedora's rpm-build's "debugedit" binary - corrupted .debug_macro sections. - - For more info, see - https://bugzilla.redhat.com/show_bug.cgi?id=1708786 */ - complaint (_("debug info gives %s invalid macro %s " - "without body (corrupted?) at line %d " - "on file %s"), - at_commandline ? _("command-line") : _("in-file"), - is_define ? _("definition") : _("undefinition"), - line, current_file->filename); - } - else if (is_define) - parse_macro_definition (current_file, line, body); - else - { - gdb_assert (macinfo_type == DW_MACRO_undef - || macinfo_type == DW_MACRO_undef_strp - || macinfo_type == DW_MACRO_undef_sup); - macro_undef (current_file, line, body); - } - } - break; - - case DW_MACRO_start_file: - { - unsigned int bytes_read; - int line, file; - - line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); - mac_ptr += bytes_read; - file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); - mac_ptr += bytes_read; - - if ((line == 0 && !at_commandline) - || (line != 0 && at_commandline)) - complaint (_("debug info gives source %d included " - "from %s at %s line %d"), - file, at_commandline ? _("command-line") : _("file"), - line == 0 ? _("zero") : _("non-zero"), line); - - if (at_commandline) - { - /* This DW_MACRO_start_file was executed in the - pass one. */ - at_commandline = 0; - } - else - current_file = macro_start_file (cu, file, line, current_file, - lh); - } - break; - - case DW_MACRO_end_file: - if (! current_file) - complaint (_("macro debug info has an unmatched " - "`close_file' directive")); - else - { - current_file = current_file->included_by; - if (! current_file) - { - enum dwarf_macro_record_type next_type; - - /* GCC circa March 2002 doesn't produce the zero - type byte marking the end of the compilation - unit. Complain if it's not there, but exit no - matter what. */ - - /* Do we at least have room for a macinfo type byte? */ - if (mac_ptr >= mac_end) - { - dwarf2_section_buffer_overflow_complaint (section); - return; - } - - /* We don't increment mac_ptr here, so this is just - a look-ahead. */ - next_type - = (enum dwarf_macro_record_type) read_1_byte (abfd, - mac_ptr); - if (next_type != 0) - complaint (_("no terminating 0-type entry for " - "macros in `.debug_macinfo' section")); - - return; - } - } - break; - - case DW_MACRO_import: - case DW_MACRO_import_sup: - { - LONGEST offset; - void **slot; - bfd *include_bfd = abfd; - struct dwarf2_section_info *include_section = section; - const gdb_byte *include_mac_end = mac_end; - int is_dwz = section_is_dwz; - const gdb_byte *new_mac_ptr; - - offset = read_offset_1 (abfd, mac_ptr, offset_size); - mac_ptr += offset_size; - - if (macinfo_type == DW_MACRO_import_sup) - { - struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile); - - dwz->macro.read (objfile); - - include_section = &dwz->macro; - include_bfd = include_section->get_bfd_owner (); - include_mac_end = dwz->macro.buffer + dwz->macro.size; - is_dwz = 1; - } - - new_mac_ptr = include_section->buffer + offset; - slot = htab_find_slot (include_hash, new_mac_ptr, INSERT); - - if (*slot != NULL) - { - /* This has actually happened; see - http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */ - complaint (_("recursive DW_MACRO_import in " - ".debug_macro section")); - } - else - { - *slot = (void *) new_mac_ptr; - - dwarf_decode_macro_bytes (cu, include_bfd, new_mac_ptr, - include_mac_end, current_file, lh, - section, section_is_gnu, is_dwz, - offset_size, include_hash); - - htab_remove_elt (include_hash, (void *) new_mac_ptr); - } - } - break; - - case DW_MACINFO_vendor_ext: - if (!section_is_gnu) - { - unsigned int bytes_read; - - /* This reads the constant, but since we don't recognize - any vendor extensions, we ignore it. */ - read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); - mac_ptr += bytes_read; - read_direct_string (abfd, mac_ptr, &bytes_read); - mac_ptr += bytes_read; - - /* We don't recognize any vendor extensions. */ - break; - } - /* FALLTHROUGH */ - - default: - mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions, - mac_ptr, mac_end, abfd, offset_size, - section); - if (mac_ptr == NULL) - return; - break; - } - DIAGNOSTIC_POP - } while (macinfo_type != 0); -} - -static void -dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset, - int section_is_gnu) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - struct objfile *objfile = dwarf2_per_objfile->objfile; - struct line_header *lh = cu->line_header; - bfd *abfd; - const gdb_byte *mac_ptr, *mac_end; - struct macro_source_file *current_file = 0; - enum dwarf_macro_record_type macinfo_type; - unsigned int offset_size = cu->header.offset_size; - const gdb_byte *opcode_definitions[256]; - void **slot; - struct dwarf2_section_info *section; - const char *section_name; - - if (cu->dwo_unit != NULL) - { - if (section_is_gnu) - { - section = &cu->dwo_unit->dwo_file->sections.macro; - section_name = ".debug_macro.dwo"; - } - else - { - section = &cu->dwo_unit->dwo_file->sections.macinfo; - section_name = ".debug_macinfo.dwo"; - } - } - else - { - if (section_is_gnu) - { - section = &dwarf2_per_objfile->macro; - section_name = ".debug_macro"; - } - else - { - section = &dwarf2_per_objfile->macinfo; - section_name = ".debug_macinfo"; - } - } - - section->read (objfile); - if (section->buffer == NULL) - { - complaint (_("missing %s section"), section_name); - return; - } - abfd = section->get_bfd_owner (); - - /* First pass: Find the name of the base filename. - This filename is needed in order to process all macros whose definition - (or undefinition) comes from the command line. These macros are defined - before the first DW_MACINFO_start_file entry, and yet still need to be - associated to the base file. - - To determine the base file name, we scan the macro definitions until we - reach the first DW_MACINFO_start_file entry. We then initialize - CURRENT_FILE accordingly so that any macro definition found before the - first DW_MACINFO_start_file can still be associated to the base file. */ - - mac_ptr = section->buffer + offset; - mac_end = section->buffer + section->size; - - mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr, - &offset_size, section_is_gnu); - if (mac_ptr == NULL) - { - /* We already issued a complaint. */ - return; - } - - do - { - /* Do we at least have room for a macinfo type byte? */ - if (mac_ptr >= mac_end) - { - /* Complaint is printed during the second pass as GDB will probably - stop the first pass earlier upon finding - DW_MACINFO_start_file. */ - break; - } - - macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr); - mac_ptr++; - - /* Note that we rely on the fact that the corresponding GNU and - DWARF constants are the same. */ - DIAGNOSTIC_PUSH - DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES - switch (macinfo_type) - { - /* A zero macinfo type indicates the end of the macro - information. */ - case 0: - break; - - case DW_MACRO_define: - case DW_MACRO_undef: - /* Only skip the data by MAC_PTR. */ - { - unsigned int bytes_read; - - read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); - mac_ptr += bytes_read; - read_direct_string (abfd, mac_ptr, &bytes_read); - mac_ptr += bytes_read; - } - break; - - case DW_MACRO_start_file: - { - unsigned int bytes_read; - int line, file; - - line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); - mac_ptr += bytes_read; - file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); - mac_ptr += bytes_read; - - current_file = macro_start_file (cu, file, line, current_file, lh); - } - break; - - case DW_MACRO_end_file: - /* No data to skip by MAC_PTR. */ - break; - - case DW_MACRO_define_strp: - case DW_MACRO_undef_strp: - case DW_MACRO_define_sup: - case DW_MACRO_undef_sup: - { - unsigned int bytes_read; - - read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); - mac_ptr += bytes_read; - mac_ptr += offset_size; - } - break; - - case DW_MACRO_import: - case DW_MACRO_import_sup: - /* Note that, according to the spec, a transparent include - chain cannot call DW_MACRO_start_file. So, we can just - skip this opcode. */ - mac_ptr += offset_size; - break; - - case DW_MACINFO_vendor_ext: - /* Only skip the data by MAC_PTR. */ - if (!section_is_gnu) - { - unsigned int bytes_read; - - read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); - mac_ptr += bytes_read; - read_direct_string (abfd, mac_ptr, &bytes_read); - mac_ptr += bytes_read; - } - /* FALLTHROUGH */ - - default: - mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions, - mac_ptr, mac_end, abfd, offset_size, - section); - if (mac_ptr == NULL) - return; - break; - } - DIAGNOSTIC_POP - } while (macinfo_type != 0 && current_file == NULL); - - /* Second pass: Process all entries. - - Use the AT_COMMAND_LINE flag to determine whether we are still processing - command-line macro definitions/undefinitions. This flag is unset when we - reach the first DW_MACINFO_start_file entry. */ - - htab_up include_hash (htab_create_alloc (1, htab_hash_pointer, - htab_eq_pointer, - NULL, xcalloc, xfree)); - mac_ptr = section->buffer + offset; - slot = htab_find_slot (include_hash.get (), mac_ptr, INSERT); - *slot = (void *) mac_ptr; - dwarf_decode_macro_bytes (cu, abfd, mac_ptr, mac_end, - current_file, lh, section, - section_is_gnu, 0, offset_size, - include_hash.get ()); -} - -/* Return the .debug_loc section to use for CU. - For DWO files use .debug_loc.dwo. */ - -static struct dwarf2_section_info * -cu_debug_loc_section (struct dwarf2_cu *cu) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - - if (cu->dwo_unit) - { - struct dwo_sections *sections = &cu->dwo_unit->dwo_file->sections; - - return cu->header.version >= 5 ? §ions->loclists : §ions->loc; - } - return (cu->header.version >= 5 ? &dwarf2_per_objfile->loclists - : &dwarf2_per_objfile->loc); -} - -/* A helper function that fills in a dwarf2_loclist_baton. */ - -static void -fill_in_loclist_baton (struct dwarf2_cu *cu, - struct dwarf2_loclist_baton *baton, - const struct attribute *attr) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - struct dwarf2_section_info *section = cu_debug_loc_section (cu); - - section->read (dwarf2_per_objfile->objfile); - - baton->per_cu = cu->per_cu; - gdb_assert (baton->per_cu); - /* We don't know how long the location list is, but make sure we - don't run off the edge of the section. */ - baton->size = section->size - DW_UNSND (attr); - baton->data = section->buffer + DW_UNSND (attr); - baton->base_address = cu->base_address; - baton->from_dwo = cu->dwo_unit != NULL; -} - -static void -dwarf2_symbol_mark_computed (const struct attribute *attr, struct symbol *sym, - struct dwarf2_cu *cu, int is_block) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - struct objfile *objfile = dwarf2_per_objfile->objfile; - struct dwarf2_section_info *section = cu_debug_loc_section (cu); - - if (attr->form_is_section_offset () - /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside - the section. If so, fall through to the complaint in the - other branch. */ - && DW_UNSND (attr) < dwarf2_section_size (objfile, section)) - { - struct dwarf2_loclist_baton *baton; - - baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_loclist_baton); - - fill_in_loclist_baton (cu, baton, attr); - - if (cu->base_known == 0) - complaint (_("Location list used without " - "specifying the CU base address.")); - - SYMBOL_ACLASS_INDEX (sym) = (is_block - ? dwarf2_loclist_block_index - : dwarf2_loclist_index); - SYMBOL_LOCATION_BATON (sym) = baton; - } - else - { - struct dwarf2_locexpr_baton *baton; - - baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton); - baton->per_cu = cu->per_cu; - gdb_assert (baton->per_cu); - - if (attr->form_is_block ()) - { - /* Note that we're just copying the block's data pointer - here, not the actual data. We're still pointing into the - info_buffer for SYM's objfile; right now we never release - that buffer, but when we do clean up properly this may - need to change. */ - baton->size = DW_BLOCK (attr)->size; - baton->data = DW_BLOCK (attr)->data; - } - else - { - dwarf2_invalid_attrib_class_complaint ("location description", - sym->natural_name ()); - baton->size = 0; - } - - SYMBOL_ACLASS_INDEX (sym) = (is_block - ? dwarf2_locexpr_block_index - : dwarf2_locexpr_index); - SYMBOL_LOCATION_BATON (sym) = baton; - } -} - -/* Return the OBJFILE associated with the compilation unit CU. If CU - came from a separate debuginfo file, then the master objfile is - returned. */ - -struct objfile * -dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu) -{ - struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile; - - /* Return the master objfile, so that we can report and look up the - correct file containing this variable. */ - if (objfile->separate_debug_objfile_backlink) - objfile = objfile->separate_debug_objfile_backlink; - - return objfile; -} - -/* Return comp_unit_head for PER_CU, either already available in PER_CU->CU - (CU_HEADERP is unused in such case) or prepare a temporary copy at - CU_HEADERP first. */ - -static const struct comp_unit_head * -per_cu_header_read_in (struct comp_unit_head *cu_headerp, - struct dwarf2_per_cu_data *per_cu) -{ - const gdb_byte *info_ptr; - - if (per_cu->cu) - return &per_cu->cu->header; - - info_ptr = per_cu->section->buffer + to_underlying (per_cu->sect_off); - - memset (cu_headerp, 0, sizeof (*cu_headerp)); - read_comp_unit_head (cu_headerp, info_ptr, per_cu->section, - rcuh_kind::COMPILE); - - return cu_headerp; -} - -/* Return the address size given in the compilation unit header for CU. */ - -int -dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu) -{ - struct comp_unit_head cu_header_local; - const struct comp_unit_head *cu_headerp; - - cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu); - - return cu_headerp->addr_size; -} - -/* Return the offset size given in the compilation unit header for CU. */ - -int -dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu) -{ - struct comp_unit_head cu_header_local; - const struct comp_unit_head *cu_headerp; - - cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu); - - return cu_headerp->offset_size; -} - -/* See its dwarf2loc.h declaration. */ - -int -dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu) -{ - struct comp_unit_head cu_header_local; - const struct comp_unit_head *cu_headerp; - - cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu); - - if (cu_headerp->version == 2) - return cu_headerp->addr_size; - else - return cu_headerp->offset_size; -} - -/* Return the text offset of the CU. The returned offset comes from - this CU's objfile. If this objfile came from a separate debuginfo - file, then the offset may be different from the corresponding - offset in the parent objfile. */ - -CORE_ADDR -dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu) -{ - return per_cu->dwarf2_per_objfile->objfile->text_section_offset (); -} - -/* Return a type that is a generic pointer type, the size of which matches - the address size given in the compilation unit header for PER_CU. */ -static struct type * -dwarf2_per_cu_addr_type (struct dwarf2_per_cu_data *per_cu) -{ - struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile; - struct type *void_type = objfile_type (objfile)->builtin_void; - struct type *addr_type = lookup_pointer_type (void_type); - int addr_size = dwarf2_per_cu_addr_size (per_cu); - - if (TYPE_LENGTH (addr_type) == addr_size) - return addr_type; - - addr_type - = dwarf2_per_cu_addr_sized_int_type (per_cu, TYPE_UNSIGNED (addr_type)); - return addr_type; -} - -/* Return DWARF version number of PER_CU. */ - -short -dwarf2_version (struct dwarf2_per_cu_data *per_cu) -{ - return per_cu->dwarf_version; -} - -/* Locate the .debug_info compilation unit from CU's objfile which contains - the DIE at OFFSET. Raises an error on failure. */ - -static struct dwarf2_per_cu_data * -dwarf2_find_containing_comp_unit (sect_offset sect_off, - unsigned int offset_in_dwz, - struct dwarf2_per_objfile *dwarf2_per_objfile) -{ - struct dwarf2_per_cu_data *this_cu; - int low, high; - - low = 0; - high = dwarf2_per_objfile->all_comp_units.size () - 1; - while (high > low) - { - struct dwarf2_per_cu_data *mid_cu; - int mid = low + (high - low) / 2; - - mid_cu = dwarf2_per_objfile->all_comp_units[mid]; - if (mid_cu->is_dwz > offset_in_dwz - || (mid_cu->is_dwz == offset_in_dwz - && mid_cu->sect_off + mid_cu->length >= sect_off)) - high = mid; - else - low = mid + 1; - } - gdb_assert (low == high); - this_cu = dwarf2_per_objfile->all_comp_units[low]; - if (this_cu->is_dwz != offset_in_dwz || this_cu->sect_off > sect_off) - { - if (low == 0 || this_cu->is_dwz != offset_in_dwz) - error (_("Dwarf Error: could not find partial DIE containing " - "offset %s [in module %s]"), - sect_offset_str (sect_off), - bfd_get_filename (dwarf2_per_objfile->objfile->obfd)); - - gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->sect_off - <= sect_off); - return dwarf2_per_objfile->all_comp_units[low-1]; - } - else - { - if (low == dwarf2_per_objfile->all_comp_units.size () - 1 - && sect_off >= this_cu->sect_off + this_cu->length) - error (_("invalid dwarf2 offset %s"), sect_offset_str (sect_off)); - gdb_assert (sect_off < this_cu->sect_off + this_cu->length); - return this_cu; - } -} - -/* Initialize dwarf2_cu CU, owned by PER_CU. */ - -dwarf2_cu::dwarf2_cu (struct dwarf2_per_cu_data *per_cu_) - : per_cu (per_cu_), - mark (false), - has_loclist (false), - checked_producer (false), - producer_is_gxx_lt_4_6 (false), - producer_is_gcc_lt_4_3 (false), - producer_is_icc (false), - producer_is_icc_lt_14 (false), - producer_is_codewarrior (false), - processing_has_namespace_info (false) -{ - per_cu->cu = this; -} - -/* Destroy a dwarf2_cu. */ - -dwarf2_cu::~dwarf2_cu () -{ - per_cu->cu = NULL; -} - -/* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */ - -static void -prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die, - enum language pretend_language) -{ - struct attribute *attr; - - /* Set the language we're debugging. */ - attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu); - if (attr != nullptr) - set_cu_language (DW_UNSND (attr), cu); - else - { - cu->language = pretend_language; - cu->language_defn = language_def (cu->language); - } - - cu->producer = dwarf2_string_attr (comp_unit_die, DW_AT_producer, cu); -} - -/* Increase the age counter on each cached compilation unit, and free - any that are too old. */ - -static void -age_cached_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile) -{ - struct dwarf2_per_cu_data *per_cu, **last_chain; - - dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain); - per_cu = dwarf2_per_objfile->read_in_chain; - while (per_cu != NULL) - { - per_cu->cu->last_used ++; - if (per_cu->cu->last_used <= dwarf_max_cache_age) - dwarf2_mark (per_cu->cu); - per_cu = per_cu->cu->read_in_chain; - } - - per_cu = dwarf2_per_objfile->read_in_chain; - last_chain = &dwarf2_per_objfile->read_in_chain; - while (per_cu != NULL) - { - struct dwarf2_per_cu_data *next_cu; - - next_cu = per_cu->cu->read_in_chain; - - if (!per_cu->cu->mark) - { - delete per_cu->cu; - *last_chain = next_cu; - } - else - last_chain = &per_cu->cu->read_in_chain; - - per_cu = next_cu; - } -} - -/* Remove a single compilation unit from the cache. */ - -static void -free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu) -{ - struct dwarf2_per_cu_data *per_cu, **last_chain; - struct dwarf2_per_objfile *dwarf2_per_objfile - = target_per_cu->dwarf2_per_objfile; - - per_cu = dwarf2_per_objfile->read_in_chain; - last_chain = &dwarf2_per_objfile->read_in_chain; - while (per_cu != NULL) - { - struct dwarf2_per_cu_data *next_cu; - - next_cu = per_cu->cu->read_in_chain; - - if (per_cu == target_per_cu) - { - delete per_cu->cu; - per_cu->cu = NULL; - *last_chain = next_cu; - break; - } - else - last_chain = &per_cu->cu->read_in_chain; - - per_cu = next_cu; - } -} - -/* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer. - We store these in a hash table separate from the DIEs, and preserve them - when the DIEs are flushed out of cache. - - The CU "per_cu" pointer is needed because offset alone is not enough to - uniquely identify the type. A file may have multiple .debug_types sections, - or the type may come from a DWO file. Furthermore, while it's more logical - to use per_cu->section+offset, with Fission the section with the data is in - the DWO file but we don't know that section at the point we need it. - We have to use something in dwarf2_per_cu_data (or the pointer to it) - because we can enter the lookup routine, get_die_type_at_offset, from - outside this file, and thus won't necessarily have PER_CU->cu. - Fortunately, PER_CU is stable for the life of the objfile. */ - -struct dwarf2_per_cu_offset_and_type -{ - const struct dwarf2_per_cu_data *per_cu; - sect_offset sect_off; - struct type *type; -}; - -/* Hash function for a dwarf2_per_cu_offset_and_type. */ - -static hashval_t -per_cu_offset_and_type_hash (const void *item) -{ - const struct dwarf2_per_cu_offset_and_type *ofs - = (const struct dwarf2_per_cu_offset_and_type *) item; - - return (uintptr_t) ofs->per_cu + to_underlying (ofs->sect_off); -} - -/* Equality function for a dwarf2_per_cu_offset_and_type. */ - -static int -per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs) -{ - const struct dwarf2_per_cu_offset_and_type *ofs_lhs - = (const struct dwarf2_per_cu_offset_and_type *) item_lhs; - const struct dwarf2_per_cu_offset_and_type *ofs_rhs - = (const struct dwarf2_per_cu_offset_and_type *) item_rhs; - - return (ofs_lhs->per_cu == ofs_rhs->per_cu - && ofs_lhs->sect_off == ofs_rhs->sect_off); -} - -/* Set the type associated with DIE to TYPE. Save it in CU's hash - table if necessary. For convenience, return TYPE. - - The DIEs reading must have careful ordering to: - * Not cause infinite loops trying to read in DIEs as a prerequisite for - reading current DIE. - * Not trying to dereference contents of still incompletely read in types - while reading in other DIEs. - * Enable referencing still incompletely read in types just by a pointer to - the type without accessing its fields. - - Therefore caller should follow these rules: - * Try to fetch any prerequisite types we may need to build this DIE type - before building the type and calling set_die_type. - * After building type call set_die_type for current DIE as soon as - possible before fetching more types to complete the current type. - * Make the type as complete as possible before fetching more types. */ - -static struct type * -set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu) -{ - struct dwarf2_per_objfile *dwarf2_per_objfile - = cu->per_cu->dwarf2_per_objfile; - struct dwarf2_per_cu_offset_and_type **slot, ofs; - struct objfile *objfile = dwarf2_per_objfile->objfile; - struct attribute *attr; - struct dynamic_prop prop; - - /* For Ada types, make sure that the gnat-specific data is always - initialized (if not already set). There are a few types where - we should not be doing so, because the type-specific area is - already used to hold some other piece of info (eg: TYPE_CODE_FLT - where the type-specific area is used to store the floatformat). - But this is not a problem, because the gnat-specific information - is actually not needed for these types. */ - if (need_gnat_info (cu) - && TYPE_CODE (type) != TYPE_CODE_FUNC - && TYPE_CODE (type) != TYPE_CODE_FLT - && TYPE_CODE (type) != TYPE_CODE_METHODPTR - && TYPE_CODE (type) != TYPE_CODE_MEMBERPTR - && TYPE_CODE (type) != TYPE_CODE_METHOD - && !HAVE_GNAT_AUX_INFO (type)) - INIT_GNAT_SPECIFIC (type); - - /* Read DW_AT_allocated and set in type. */ - attr = dwarf2_attr (die, DW_AT_allocated, cu); - if (attr != NULL && attr->form_is_block ()) - { - struct type *prop_type - = dwarf2_per_cu_addr_sized_int_type (cu->per_cu, false); - if (attr_to_dynamic_prop (attr, die, cu, &prop, prop_type)) - add_dyn_prop (DYN_PROP_ALLOCATED, prop, type); - } - else if (attr != NULL) - { - complaint (_("DW_AT_allocated has the wrong form (%s) at DIE %s"), - (attr != NULL ? dwarf_form_name (attr->form) : "n/a"), - sect_offset_str (die->sect_off)); - } - - /* Read DW_AT_associated and set in type. */ - attr = dwarf2_attr (die, DW_AT_associated, cu); - if (attr != NULL && attr->form_is_block ()) - { - struct type *prop_type - = dwarf2_per_cu_addr_sized_int_type (cu->per_cu, false); - if (attr_to_dynamic_prop (attr, die, cu, &prop, prop_type)) - add_dyn_prop (DYN_PROP_ASSOCIATED, prop, type); - } - else if (attr != NULL) - { - complaint (_("DW_AT_associated has the wrong form (%s) at DIE %s"), - (attr != NULL ? dwarf_form_name (attr->form) : "n/a"), - sect_offset_str (die->sect_off)); - } - - /* Read DW_AT_data_location and set in type. */ - attr = dwarf2_attr (die, DW_AT_data_location, cu); - if (attr_to_dynamic_prop (attr, die, cu, &prop, - dwarf2_per_cu_addr_type (cu->per_cu))) - add_dyn_prop (DYN_PROP_DATA_LOCATION, prop, type); - - if (dwarf2_per_objfile->die_type_hash == NULL) - { - dwarf2_per_objfile->die_type_hash = - htab_create_alloc_ex (127, - per_cu_offset_and_type_hash, - per_cu_offset_and_type_eq, - NULL, - &objfile->objfile_obstack, - hashtab_obstack_allocate, - dummy_obstack_deallocate); - } - - ofs.per_cu = cu->per_cu; - ofs.sect_off = die->sect_off; - ofs.type = type; - slot = (struct dwarf2_per_cu_offset_and_type **) - htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT); - if (*slot) - complaint (_("A problem internal to GDB: DIE %s has type already set"), - sect_offset_str (die->sect_off)); - *slot = XOBNEW (&objfile->objfile_obstack, - struct dwarf2_per_cu_offset_and_type); - **slot = ofs; - return type; -} - -/* Look up the type for the die at SECT_OFF in PER_CU in die_type_hash, - or return NULL if the die does not have a saved type. */ - -static struct type * -get_die_type_at_offset (sect_offset sect_off, - struct dwarf2_per_cu_data *per_cu) -{ - struct dwarf2_per_cu_offset_and_type *slot, ofs; - struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile; - - if (dwarf2_per_objfile->die_type_hash == NULL) - return NULL; - - ofs.per_cu = per_cu; - ofs.sect_off = sect_off; - slot = ((struct dwarf2_per_cu_offset_and_type *) - htab_find (dwarf2_per_objfile->die_type_hash, &ofs)); - if (slot) - return slot->type; - else - return NULL; -} - -/* Look up the type for DIE in CU in die_type_hash, - or return NULL if DIE does not have a saved type. */ - -static struct type * -get_die_type (struct die_info *die, struct dwarf2_cu *cu) -{ - return get_die_type_at_offset (die->sect_off, cu->per_cu); -} - -/* Add a dependence relationship from CU to REF_PER_CU. */ - -static void -dwarf2_add_dependence (struct dwarf2_cu *cu, - struct dwarf2_per_cu_data *ref_per_cu) -{ - void **slot; - - if (cu->dependencies == NULL) - cu->dependencies - = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer, - NULL, &cu->comp_unit_obstack, - hashtab_obstack_allocate, - dummy_obstack_deallocate); - - slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT); - if (*slot == NULL) - *slot = ref_per_cu; -} - -/* Subroutine of dwarf2_mark to pass to htab_traverse. - Set the mark field in every compilation unit in the - cache that we must keep because we are keeping CU. */ - -static int -dwarf2_mark_helper (void **slot, void *data) -{ - struct dwarf2_per_cu_data *per_cu; - - per_cu = (struct dwarf2_per_cu_data *) *slot; - - /* cu->dependencies references may not yet have been ever read if QUIT aborts - reading of the chain. As such dependencies remain valid it is not much - useful to track and undo them during QUIT cleanups. */ - if (per_cu->cu == NULL) - return 1; - - if (per_cu->cu->mark) - return 1; - per_cu->cu->mark = true; - - if (per_cu->cu->dependencies != NULL) - htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL); - - return 1; -} - -/* Set the mark field in CU and in every other compilation unit in the - cache that we must keep because we are keeping CU. */ - -static void -dwarf2_mark (struct dwarf2_cu *cu) -{ - if (cu->mark) - return; - cu->mark = true; - if (cu->dependencies != NULL) - htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL); -} - -static void -dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu) -{ - while (per_cu) - { - per_cu->cu->mark = false; - per_cu = per_cu->cu->read_in_chain; - } -} - -/* Trivial hash function for partial_die_info: the hash value of a DIE - is its offset in .debug_info for this objfile. */ - -static hashval_t -partial_die_hash (const void *item) -{ - const struct partial_die_info *part_die - = (const struct partial_die_info *) item; - - return to_underlying (part_die->sect_off); -} - -/* Trivial comparison function for partial_die_info structures: two DIEs - are equal if they have the same offset. */ - -static int -partial_die_eq (const void *item_lhs, const void *item_rhs) -{ - const struct partial_die_info *part_die_lhs - = (const struct partial_die_info *) item_lhs; - const struct partial_die_info *part_die_rhs - = (const struct partial_die_info *) item_rhs; - - return part_die_lhs->sect_off == part_die_rhs->sect_off; -} - -struct cmd_list_element *set_dwarf_cmdlist; -struct cmd_list_element *show_dwarf_cmdlist; - -static void -set_dwarf_cmd (const char *args, int from_tty) -{ - help_list (set_dwarf_cmdlist, "maintenance set dwarf ", all_commands, - gdb_stdout); -} - -static void -show_dwarf_cmd (const char *args, int from_tty) -{ - cmd_show_list (show_dwarf_cmdlist, from_tty, ""); -} - -bool dwarf_always_disassemble; - -static void -show_dwarf_always_disassemble (struct ui_file *file, int from_tty, - struct cmd_list_element *c, const char *value) -{ - fprintf_filtered (file, - _("Whether to always disassemble " - "DWARF expressions is %s.\n"), - value); -} - -static void -show_check_physname (struct ui_file *file, int from_tty, - struct cmd_list_element *c, const char *value) -{ - fprintf_filtered (file, - _("Whether to check \"physname\" is %s.\n"), - value); -} - -void _initialize_dwarf2_read (); -void -_initialize_dwarf2_read () -{ - add_prefix_cmd ("dwarf", class_maintenance, set_dwarf_cmd, _("\ -Set DWARF specific variables.\n\ -Configure DWARF variables such as the cache size."), - &set_dwarf_cmdlist, "maintenance set dwarf ", - 0/*allow-unknown*/, &maintenance_set_cmdlist); - - add_prefix_cmd ("dwarf", class_maintenance, show_dwarf_cmd, _("\ -Show DWARF specific variables.\n\ -Show DWARF variables such as the cache size."), - &show_dwarf_cmdlist, "maintenance show dwarf ", - 0/*allow-unknown*/, &maintenance_show_cmdlist); - - add_setshow_zinteger_cmd ("max-cache-age", class_obscure, - &dwarf_max_cache_age, _("\ -Set the upper bound on the age of cached DWARF compilation units."), _("\ -Show the upper bound on the age of cached DWARF compilation units."), _("\ -A higher limit means that cached compilation units will be stored\n\ -in memory longer, and more total memory will be used. Zero disables\n\ -caching, which can slow down startup."), - NULL, - show_dwarf_max_cache_age, - &set_dwarf_cmdlist, - &show_dwarf_cmdlist); - - add_setshow_boolean_cmd ("always-disassemble", class_obscure, - &dwarf_always_disassemble, _("\ -Set whether `info address' always disassembles DWARF expressions."), _("\ -Show whether `info address' always disassembles DWARF expressions."), _("\ -When enabled, DWARF expressions are always printed in an assembly-like\n\ -syntax. When disabled, expressions will be printed in a more\n\ -conversational style, when possible."), - NULL, - show_dwarf_always_disassemble, - &set_dwarf_cmdlist, - &show_dwarf_cmdlist); - - add_setshow_zuinteger_cmd ("dwarf-read", no_class, &dwarf_read_debug, _("\ -Set debugging of the DWARF reader."), _("\ -Show debugging of the DWARF reader."), _("\ -When enabled (non-zero), debugging messages are printed during DWARF\n\ -reading and symtab expansion. A value of 1 (one) provides basic\n\ -information. A value greater than 1 provides more verbose information."), - NULL, - NULL, - &setdebuglist, &showdebuglist); - - add_setshow_zuinteger_cmd ("dwarf-die", no_class, &dwarf_die_debug, _("\ -Set debugging of the DWARF DIE reader."), _("\ -Show debugging of the DWARF DIE reader."), _("\ -When enabled (non-zero), DIEs are dumped after they are read in.\n\ -The value is the maximum depth to print."), - NULL, - NULL, - &setdebuglist, &showdebuglist); - - add_setshow_zuinteger_cmd ("dwarf-line", no_class, &dwarf_line_debug, _("\ -Set debugging of the dwarf line reader."), _("\ -Show debugging of the dwarf line reader."), _("\ -When enabled (non-zero), line number entries are dumped as they are read in.\n\ -A value of 1 (one) provides basic information.\n\ -A value greater than 1 provides more verbose information."), - NULL, - NULL, - &setdebuglist, &showdebuglist); - - add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\ -Set cross-checking of \"physname\" code against demangler."), _("\ -Show cross-checking of \"physname\" code against demangler."), _("\ -When enabled, GDB's internal \"physname\" code is checked against\n\ -the demangler."), - NULL, show_check_physname, - &setdebuglist, &showdebuglist); - - add_setshow_boolean_cmd ("use-deprecated-index-sections", - no_class, &use_deprecated_index_sections, _("\ -Set whether to use deprecated gdb_index sections."), _("\ -Show whether to use deprecated gdb_index sections."), _("\ -When enabled, deprecated .gdb_index sections are used anyway.\n\ -Normally they are ignored either because of a missing feature or\n\ -performance issue.\n\ -Warning: This option must be enabled before gdb reads the file."), - NULL, - NULL, - &setlist, &showlist); - - dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED, - &dwarf2_locexpr_funcs); - dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED, - &dwarf2_loclist_funcs); - - dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK, - &dwarf2_block_frame_base_locexpr_funcs); - dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK, - &dwarf2_block_frame_base_loclist_funcs); - -#if GDB_SELF_TEST - selftests::register_test ("dw2_expand_symtabs_matching", - selftests::dw2_expand_symtabs_matching::run_test); -#endif -} |