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Diffstat (limited to 'gdb/dwarf2/read.c')
| -rw-r--r-- | gdb/dwarf2/read.c | 25534 |
1 files changed, 25534 insertions, 0 deletions
diff --git a/gdb/dwarf2/read.c b/gdb/dwarf2/read.c new file mode 100644 index 0000000..f91e364 --- /dev/null +++ b/gdb/dwarf2/read.c @@ -0,0 +1,25534 @@ +/* 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 "dwarf2/read.h" +#include "dwarf2/abbrev.h" +#include "dwarf2/attribute.h" +#include "dwarf2/index-cache.h" +#include "dwarf2/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 "dwarf2/expr.h" +#include "dwarf2/loc.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 +} |