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In the past, these files needed to be handled by hand, because
the testcase was sensitive to the length of the header, which was
potentially changing when new copyright years were added to
the copyright header. Now that we simply maintain and update
a range, the length of the copyright header should not change
as a consequence of the update performed by this script, so
special handling of those files is no longer necessary.
gdb/ChangeLog:
* copyright.py (BY_HAND): Remove gdb/testsuite/gdb.base/step-line.inp
and gdb/testsuite/gdb.base/step-line.c.
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There is a small logical error in the part of the script that
dumps the list of files in BY_HAND + MULTIPLE_COPYRIGHT_HEADERS
but only checkis the contents of BY_HAND. The issue becomes
apparent as soon as BY_HAND is empty. Prevent this from happening
by treating the two lists separately, as this allows us to provide
a more informative message in the case of MULTIPLE_COPYRIGHT_HEADERS.
gdb/ChangeLog:
* copyright.py (main): Dump the contents of
MULTIPLE_COPYRIGHT_HEADERS (separately) from BY_HAND,
even if BY_HAND is empty.
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gdb/ChangeLog:
* top.c (print_gdb_version): Update Copyright year in version
message.
gdb/gdbserver/ChangeLog:
* gdbreplay.c (gdbreplay_version): Update copyright year in
version message.
* server.c (gdbserver_version): Likewise.
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gdb/ChangeLog
* config/djgpp/fnchange.lst: Add entry for gdb/ChangeLog-2017.
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The code here wants to find address of an element, and often this
element is one past the end of std::vector. Dereferencing that element
leads to undefined behavior, so it's better to simply use pointer
arithmetic instead of taking address of invalid dereference.
gdb/ChangeLog:
* psymtab.c (recursively_search_psymtabs): Use pointer arithmetic
instead of dereferencing std::vector past the end.
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My patch
dwarf2read: Silence -Wenum-compare-switch warning
132448f8359a268f34f074b0908b5255b568da06
made some parts of dwarf2read.c ignore warnings about switch using enums
of different kinds. What I did not realize was that older Clang
versions (prior to 6) did not have that warning, and therefore give this
error:
/home/emaisin/src/binutils-gdb/gdb/dwarf2read.c:24187:7: error: unknown warning group '-Wenum-compare-switch', ignored [-Werror,-Wunknown-pragmas]
DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES
^
/home/emaisin/src/binutils-gdb/gdb/common/diagnostics.h:42:3: note: expanded from macro 'DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES'
DIAGNOSTIC_IGNORE ("-Wenum-compare-switch")
^
/home/emaisin/src/binutils-gdb/gdb/common/diagnostics.h:27:3: note: expanded from macro 'DIAGNOSTIC_IGNORE'
_Pragma (STRINGIFY (GCC diagnostic ignored option))
^
<scratch space>:10:25: note: expanded from here
GCC diagnostic ignored "-Wenum-compare-switch"
^
Clang has a way to test if it knows about a particular warning. This
patch uses that feature to only define
DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES to something if the
warning is recognized by the Clang version being used. I tested
building dwarf2read.c with clang 4, 5, 6, as well as gcc.
gdb/ChangeLog:
* common/diagnostics.h
(DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES): Only
define if the compiler knows about -Wenum-compare-switch.
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Compiling with Clang 6 gives:
/home/emaisin/src/binutils-gdb/gdb/dwarf2read.c:24385:14: error: comparison of two values with different enumeration types in switch statement ('enum dwarf_macro_record_type' and 'dwarf_macinfo_record_type') [-Werror,-Wenum-compare-switch]
case DW_MACINFO_vendor_ext:
^~~~~~~~~~~~~~~~~~~~~
/home/emaisin/src/binutils-gdb/gdb/dwarf2read.c:24561:7: error: comparison of two values with different enumeration types in switch statement ('enum dwarf_macro_record_type' and 'dwarf_macinfo_record_type') [-Werror,-Wenum-compare-switch]
case DW_MACINFO_vendor_ext:
^~~~~~~~~~~~~~~~~~~~~
This code uses the two enum types on purpose, because it handles both
.debug_macro and .debug_macinfo sections. Add some pragmas to disable
the warning in these specific cases.
gdb/ChangeLog:
* dwarf2read.c (dwarf_decode_macro_bytes): Ignore
-Wenum-compare-switch warning.
(dwarf_decode_macros): Likewise.
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This mildly C++-ifies parser_state and stap_parse_info -- just enough
to remove some cleanups.
This version includes the changes implemented by Simon.
Regression tested by the buildbot.
gdb/ChangeLog
2017-12-30 Tom Tromey <tom@tromey.com>
Simon Marchi <simon.marchi@ericsson.com>
* stap-probe.h (struct stap_parse_info): Add constructor,
destructor.
* stap-probe.c (stap_parse_argument): Update.
* rust-exp.y (rust_lex_tests): Update.
* parser-defs.h (struct parser_state): Add constructor,
destructor, release method.
<expout>: Change type to expression_up.
(null_post_parser): Change type.
(initialize_expout, reallocate_expout): Remove.
* parse.c (parser_state::parser_state): Rename from
initialize_expout.
(parser_state::release): Rename from reallocate_expout.
(write_exp_elt, parse_exp_in_context_1, increase_expout_size):
Update.
(null_post_parser): Change type of "exp".
* dtrace-probe.c (dtrace_probe::build_arg_exprs): Update.
* ada-lang.c (resolve, resolve_subexp)
(replace_operator_with_call): Change type of "expp".
* language.h (struct language_defn) <la_post_parser>: Change type
of "expp".
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When compiling with Clang 6, I see these warnings:
/home/emaisin/src/binutils-gdb/gdb/dwarf2read.c:25421:5: error: destructor called on non-final 'mapped_index' that has virtual functions but non-virtual destructor [-Werror,-Wdelete-non-virtual-dtor]
data->index_table->~mapped_index ();
^
In file included from /home/emaisin/src/binutils-gdb/gdb/dwarf2read.c:31:
In file included from /home/emaisin/src/binutils-gdb/gdb/defs.h:28:
In file included from /home/emaisin/src/binutils-gdb/gdb/common/common-defs.h:92:
In file included from /home/emaisin/src/binutils-gdb/gdb/common/gdb_unique_ptr.h:23:
In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/5.4.0/../../../../include/c++/5.4.0/memory:81:
/usr/bin/../lib/gcc/x86_64-linux-gnu/5.4.0/../../../../include/c++/5.4.0/bits/unique_ptr.h:76:2: error: delete called on non-final 'mapped_debug_names' that has virtual functions but non-virtual destructor [-Werror,-Wdelete-non-virtual-dtor]
delete __ptr;
^
/usr/bin/../lib/gcc/x86_64-linux-gnu/5.4.0/../../../../include/c++/5.4.0/bits/unique_ptr.h:236:4: note: in instantiation of member function 'std::default_delete<mapped_debug_names>::operator()' requested here
get_deleter()(__ptr);
^
/home/emaisin/src/binutils-gdb/gdb/dwarf2read.c:2374:21: note: in instantiation of member function 'std::unique_ptr<mapped_debug_names, std::default_delete<mapped_debug_names> >::~unique_ptr' requested here
dwarf2_per_objfile::dwarf2_per_objfile (struct objfile *objfile_,
^
This patch silences these warnings by making the classes final.
gdb/ChangeLog:
* dwarf2read.c (struct mapped_debug_names): Make final.
(struct mapped_index): Make final.
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When compiling with clang 6, I see a bunch of warnings like this:
/home/emaisin/src/binutils-gdb/gdb/amd64-linux-tdep.c:1427:8: error: comparison of two values with different enumeration types in switch statement ('enum amd64_syscall' and 'amd
64_x32_syscall') [-Werror,-Wenum-compare-switch]
case amd64_x32_sys_move_pages:
^~~~~~~~~~~~~~~~~~~~~~~~
In this switch, we indeed use enumerators of both types
amd64_x32_syscall and amd64_syscall. This is done on purpose, and the
enum values are chosen so that they are complementary.
I think it's still a useful warning, so I chose to ignore just that
particular case.
gdb/ChangeLog:
* common/diagnostics.h
(DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES): New macro.
* amd64-linux-tdep.c (amd64_canonicalize_syscall): Use it.
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In thread_db_detach, we call get_thread_db_info to first check if there
exists a thread_db_info entry for the pid to detach. If there is, then
we call delete_thread_db_info. It's unnecessary to call
get_thread_db_info in the first place, since delete_thread_db_info
handles the case where no thread_db_info entry exist for the given pid.
gdb/ChangeLog:
* linux-thread-db.c (thread_db_detach): Remove call to
delete_thread_db_info.
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gas/
* testsuite/gas/riscv/priv-reg.d, testsuite/gas/riscv/priv-reg.s: New.
include/
* opcode/riscv-opc.h (DECLARE_CSR): Add missing privileged registers.
Sort to match privileged spec documentation order.
(DECLARE_CSR_ALIAS): Add ubadaddr, and comments.
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These two enumerators are unused, remove them.
gdb/ChangeLog:
* target.h (enum target_object) <TARGET_OBJECT_HPUX_UREGS,
TARGET_OBJECT_HPUX_SOLIB_GOT>: Remove.
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tdesc_register_in_reggroup_p in now able to handle arbitrary
groups. This is useful when groups are created while the
target descriptor file is received from the remote.
This can be the case of a soft core target processor where
registers/groups can change.
gdb/ChangeLog:
yyyy-mm-dd Franck Jullien <franck.jullien@gmail.com>
Stafford Horne <shorne@gmail.com>
* target-descriptions.c (tdesc_register_in_reggroup_p): Support
arbitrary strings.
(tdesc_use_registers): Add logic to register new reggroups.
(tdesc_reg::group): Update comment to indicate we allow
arbitrary strings.
* NEWS (Changes since GDB 8.0): Announce that GDB supports
arbitrary reggroups.
gdb/testsuite/ChangeLog:
yyyy-mm-dd Stafford Horne <shorne@gmail.com>
* gdb.xml/extra-regs.xml: Add example foo reggroup.
* gdb.xml/tdesc-regs.exp: Add test to check for foo reggroup.
gdb/doc/ChangeLog:
yyyy-mm-dd Stafford Horne <shorne@gmail.com>
* gdb.texinfo (Target Description Format): Explain that arbitrary
strings are now allowed for register groups.
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Traditionally reggroups have been created via reggroup_new() during
initialization code and never freed. Now, if we want to initialize
reggroups dynamically (i.e. in target description) we should be able to
free them. Create this function reggroup_gdbarch_new() which will
allocate the reggroup memory onto the passed gdbarch obstack.
Also creating reggroup_find() as a utility to find a gdbarch registered
reggroup object by name.
gdb/ChangeLog:
yyyy-mm-dd Stafford Horne <shorne@gmail.com>
* reggroups.c (reggroup_gdbarch_new): New function.
(reggroup_find): New function.
* reggroups.h (reggroup_gdbarch_new): New function.
(reggroup_find): New function.
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Currently the reggroups gdbarch_data cannot be manipulated until after
the gdbarch is completely initialized. This is usually done when the
object init depends on architecture specific fields. In the case of
reggroups it only depends on the obstack being available.
Coverting this to pre_init allows using reggroups during gdbarch
initialization. This is needed to allow registering arbitrary reggroups
during gdbarch initializations.
gdb/ChangeLog:
yyyy-mm-dd Stafford Horne <shorne@gmail.com>
* reggroups.c (reggroups_init): Change to depend only on
obstack rather than gdbarch.
(reggroup_add): Remove logic for forcing premature init.
(_initialize_reggroup): Set `reggroups_data` with
gdbarch_data_register_pre_init() rather than
gdbarch_data_register_post_init().
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Until now this feature has existed but was not documented. Adding docs
and tests.
gdb/ChangeLog:
yyyy-mm-dd Stafford Horne <shorne@gmail.com>
* infcmd.c (_initialize_infcmd): Add help for info reg $reggroup
and info all-registers $reggroup feature.
gdb/doc/ChangeLog:
yyyy-mm-dd Stafford Horne <shorne@gmail.com>
* gdb.texinfo (Registers): Document info reg $reggroup feature.
gdb/testsuite/ChangeLog:
yyyy-mm-dd Stafford Horne <shorne@gmail.com>
* gdb.base/reggroups.c: New file.
* gdb.base/reggroups.exp: New file.
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Get rid of:
/home/simark/src/binutils-gdb/gdb/target-descriptions.c:2026:25: error: format string is not a string literal [-Werror,-Wformat-nonliteral]
vprintf_unfiltered (fmt, args);
when building with clang.
gdb/ChangeLog:
* target-descriptions.c (print_c_tdesc)
<printf_field_type_assignment>: Add ATTRIBUTE_PRINTF.
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While fiddling a bit with -Wunused-variable, Sergio noticed that "maint
print c-tdesc" was always generating code for the "tdesc_type
*field_type" variable, even when it wasn't used. This is caught by GCC
when using -Wunused-variable, of course.
This patch changes the print_c_tdesc class to only output the field
declaration when we actually need it.
It shouldn't be necessary to do the same with the other variable
declarations (type_with_fields and element_type), because they are
always if they are declared.
The C files in features/ are regenerated, some declarations of
field_type are removed, as expected, while some others move to where
they are used for the first time.
gdb/ChangeLog:
* target-descriptions.c (print_c_tdesc) <visit>: Don't output
field_type declaration, use printf_field_type_assignment
instead.
<printf_field_type_assignment>: New method.
* features/aarch64-core.c, features/aarch64-fpu.c
features/arc-arcompact.c, features/arc-v2.c,
features/arm/arm-with-iwmmxt.c, features/i386/32bit-core.c,
features/i386/32bit-mpx.c, features/i386/32bit-sse.c,
features/i386/64bit-avx512.c, features/i386/64bit-core.c,
features/i386/64bit-mpx.c, features/i386/64bit-sse.c,
features/i386/x32-core.c, features/or1k.c,
features/rs6000/powerpc-7400.c,
features/rs6000/powerpc-altivec32.c,
features/rs6000/powerpc-altivec32l.c,
features/rs6000/powerpc-altivec64.c,
features/rs6000/powerpc-altivec64l.c,
features/rs6000/powerpc-cell32l.c,
features/rs6000/powerpc-cell64l.c,
features/rs6000/powerpc-isa205-altivec32l.c,
features/rs6000/powerpc-isa205-altivec64l.c,
features/rs6000/powerpc-isa205-vsx32l.c,
features/rs6000/powerpc-isa205-vsx64l.c,
features/rs6000/powerpc-vsx32.c,
features/rs6000/powerpc-vsx32l.c,
features/rs6000/powerpc-vsx64.c,
features/rs6000/powerpc-vsx64l.c, features/s390-gs-linux64.c,
features/s390-tevx-linux64.c, features/s390-vx-linux64.c,
features/s390x-gs-linux64.c, features/s390x-tevx-linux64.c,
features/s390x-vx-linux64.c: Re-generate.
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The result of this memory read is never used, so it can be removed.
gdb/ChangeLog:
* rs6000-tdep.c (ppc_deal_with_atomic_sequence): Remove
write-only assignment to "insn" variable.
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gas/
* config/tc-riscv.c (risc_ip) <o>: Add comment.
* testsuite/gas/riscv/c-nonzero-imm.d,
* testsuite/gas/riscv/c-nonzero-imm.l,
* testsuite/gas/riscv/c-nonzero-imm.s,
* testsuite/gas/riscv/c-nonzero-reg.d,
* testsuite/gas/riscv/c-nonzero-reg.l,
* testsuite/gas/riscv/c-nonzero-reg.s,
* testsuite/gas/riscv/c-zero-imm-64.d,
* testsuite/gas/riscv/c-zero-imm-64.s,
* testsuite/gas/riscv/c-zero-imm.d, testsuite/gas/riscv/c-zero-imm.s,
* testsuite/gas/riscv/c-zero-reg.d,
* testsuite/gas/riscv/c-zero-reg.s: New.
opcodes/
* riscv-opc.c (match_c_add_with_hint, match_c_lui_with_hint): New.
(riscv_opcodes) <li>: Delete "d,0" line. Change Cj to Co.
<andi, and, add, addiw, addw, c.addi>: Change Cj to Co.
<add>: Add explanatory comment for 4-operand add instruction.
<c.nop>: Add support for immediate operand.
<c.mv, c.add>: Use match_c_add_with_hint instead of match_c_add.
<c.lui>: Use match_c_lui_with_hint instead of match_c_lui.
<c.li, c.slli>: Use match_opcode instead of match_rd_nonzero.
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On Cell/B.E. multi-architecture debugging we use a "merged" address space
that encodes both the main PowerPC address space and the local store address
spaces of all active SPUs. This will always occupy 64 bits.
However, gdbarch_addr_bit is set to 32 on SPU, and may be set to 32 as well
on PowerPC. Since the new gdbarch_significant_addr_bit defaults to the
value of gdbarch_addr_bit, this means addresses may be improperly truncated.
Work around this problem by explicitly setting gdbarch_significant_addr_bit
to 64 both for the SPU target and also for PowerPC target that support
Cell/B.E. execution.
gdb/ChangeLog:
2017-12-20 Ulrich Weigand <uweigand@de.ibm.com>
* spu-tdep.c (spu_gdbarch_init): Set set_gdbarch_significant_addr_bit
to 64 bits.
(ppc_linux_init_abi): Likewise, if Cell/B.E. is supported.
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Doing some unrelated grepping found that there were some missing
spaces, fix it.
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Dot products deviate from the normal disassembly rules for lane indexed
instruction. Their canonical representation is in the form of:
v0.2s, v0.8b, v0.4b[0] instead of v0.2s, v0.8b, v0.b[0] to try to denote
that these instructions select 4x 1 byte elements instead of a single 1 byte
element.
Previously we were disassembling them following the normal rules, this patch
corrects the disassembly.
gas/
PR gas/22559
* config/tc-aarch64.c (vectype_to_qualifier): Support AARCH64_OPND_QLF_S_4B.
* gas/testsuite/gas/aarch64/dotproduct.d: Update disassembly.
include/
PR gas/22559
* aarch64.h (aarch64_opnd_qualifier): Add AARCH64_OPND_QLF_S_4B.
opcodes/
PR gas/22559
* aarch64-asm.c (aarch64_ins_reglane): Change AARCH64_OPND_QLF_S_B to
AARCH64_OPND_QLF_S_4B
* aarch64-dis.c (aarch64_ext_reglane): Change AARCH64_OPND_QLF_S_B to
AARCH64_OPND_QLF_S_4B
* aarch64-opc.c (aarch64_opnd_qualifiers): Add 4b variant.
* aarch64-tbl.h (QL_V2DOT): Change S_B to S_4B.
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Previously parse_vector_type_for_operand was changed to allow the use of 4b
register size for indexed lane instructions. However this had the unintended
side effect of also allowing 4b for normal vector registers.
Because this support was only partial the rest of the tool silently treated
4b as 8b and continued. This patch adds full support for 4b so it can be
properly distinguished from 8b and the correct errors are generated.
With this patch you still can't encode any instruction which actually requires
v<num>.4b but such instructions don't exist so to prevent needing a workaround
in get_vreg_qualifier_from_value this was just omitted.
gas/
PR gas/22529
* config/tc-aarch64.c (vectype_to_qualifier): Support AARCH64_OPND_QLF_V_4B.
* gas/testsuite/gas/aarch64/pr22529.s: New.
* gas/testsuite/gas/aarch64/pr22529.d: New.
* gas/testsuite/gas/aarch64/pr22529.l: New.
include/
PR gas/22529
* opcode/aarch64.h (aarch64_opnd_qualifier): Add AARCH64_OPND_QLF_V_4B.
opcodes/
PR gas/22529
* aarch64-opc.c (aarch64_opnd_qualifiers): Add 4b variant.
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field of 0 in dynamic executables.
PR 22587
* readelf.c (process_section_headers): Do not complain about an
sh_info field of 0 in relocation sections of ET_EXEC or ET_DYN
type executables.
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_bfd_elf_link_renumber_dynsyms is called twice by the linker. The
first call in bfd_elf_size_dynamic_sections is just to answer the
question as to whether there are there any dynamic symbols. The
second call in bfd_elf_size_dynsym_hash_dynstr sets the st_shndx value
that dynamic symbols will have. strip_excluded_output_sections is
called between these two calls. So sections seen on the first
_bfd_elf_link_renumber_dynsyms pass might differ from those seen on
the second pass. Unfortunately, that can result in a stripped
section's dynamic symbol being assigned a dynindx on the first pass
but not corrected to the final value (of zero, ie. not dynamic) on the
second pass. PowerPC, x86, mips, and most other targets that emit
dynamic section symbols, just test that section symbol dynindx is
non-zero before using a given section symbol in dynamic relocations.
This patch prevents _bfd_elf_link_renumber_dynsyms from setting any
section symbol dynindx on the first pass.
PR 22626
* elflink.c (_bfd_elf_link_renumber_dynsyms): Don't set section
dynindx when section_sym_count is NULL.
(bfd_elf_size_dynamic_sections): Pass NULL section_sym_count to
preliminary _bfd_elf_link_renumber_dynsyms call.
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This is a followup to "binutils nm testsuite tidy". Since the perror
in binutils_assemble has been removed, we need to take more care in
failure paths.
The patch also fixed a number of .exp files that have multiple tests,
where an assembly failure returns from the .exp file. In most cases
it is nicer to attempt all tests.
* testsuite/binutils-all/ar.exp (unique_symbol): Don't run AR
if assembly fails.
* testsuite/binutils-all/arc/objdump.exp (check_assembly): If
objfile is empty, fail test.
* testsuite/binutils-all/arm/objdump.exp: Don't return if assembly
fails for a test, continue on to other tests.
* testsuite/binutils-all/bfin/objdump.exp: Likewise.
* testsuite/binutils-all/hppa/objdump.exp: Likewise.
* testsuite/binutils-all/m68k/objdump.exp: Likewise.
* testsuite/binutils-all/vax/objdump.exp: Likewise.
* testsuite/binutils-all/size.exp: Likewise.
* testsuite/binutils-all/nm.exp: Likewise. Move PR12753 test.
* testsuite/binutils-all/objcopy.exp: Don't perror on assembly fail.
* testsuite/binutils-all/objdump.exp: Report assembly fails.
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PR 22532
* dwarf.c (read_and_display_attr_value): Add attributes that might
use the DW_FORM_exprloc form, and if so, display the decoded
location expression list.
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onto the stack.
PR 22493
* config/tc-arm.c (encode_ldmstm): Do not use A2 encoding of the
PUSH insn when pushing the stack pointer.
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Just like for instructions in GPRs, there's no need to have separate
templates for otherwise identical insns acting on XMM or YMM registers
(or memory of the same size).
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... qualified by their respective sizes, allowing to drop FirstXmm0 at
the same time.
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Express them as Reg|Tbyte and Acc|Tbyte respectively.
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Use a combination of a single new Reg bit and Byte, Word, Dword, or
Qword instead.
Besides shrinking the number of operand type bits this has the benefit
of making register handling more similar to accumulator handling (a
generic flag is being accompanied by a "size qualifier"). It requires,
however, to split a few insn templates, as it is no longer correct to
have combinations like Reg32|Reg64|Byte. This slight growth in size will
hopefully be outweighed by this change paving the road for folding a
presumably much larger number of templates later on.
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Consider the following Ada code defining a global variable whose
type is an array of static bounds (1 .. 2), but where its elements
are a variant record whose size is not statically known:
type Ints is array (Natural range <>) of Integer;
type Bounded_Ints (Max_Size : Natural) is record
Length : Natural := 0;
Objs : Ints (1 .. Max_Size);
end record;
type Ints_Doubled is array (1 .. 2) of Bounded_Ints (Idem (0));
Global : Ints_Doubled;
When compiling this program at -O2 using a GCC-6.4-based compiler
on x86_64-linux, trying to print the value of that global variable
yields:
(gdb) p global
$1 =
Let's look at the debugging info, which starts with the global
variable itself...
.uleb128 0x19 # (DIE (0x25e) DW_TAG_variable)
.long .LASF32 # DW_AT_name: "fd__global"
.long 0x273 # DW_AT_type
... its type is a reference to a typedef ...
.uleb128 0x14 # (DIE (0x273) DW_TAG_reference_type)
.byte 0x8 # DW_AT_byte_size
.long 0x202 # DW_AT_type
[...]
.uleb128 0x15 # (DIE (0x202) DW_TAG_typedef)
.long .LASF19 # DW_AT_name: "fd__ints_doubled"
.long 0x20d # DW_AT_type
... of an array (1..2) ...
.uleb128 0x2 # (DIE (0x20d) DW_TAG_array_type)
.long .LASF19 # DW_AT_name: "fd__ints_doubled"
.long 0x15b # DW_AT_type
.long 0x221 # DW_AT_sibling
.uleb128 0x16 # (DIE (0x21a) DW_TAG_subrange_type)
.long 0x40 # DW_AT_type
.sleb128 2 # DW_AT_upper_bound
.byte 0 # end of children of DIE 0x20d
... of a struct whose name is fd__Tints_doubledC:
.uleb128 0x10 # (DIE (0x15b) DW_TAG_structure_type)
.long .LASF11 # DW_AT_name: "fd__Tints_doubledC"
.long 0x1e4 # DW_AT_GNAT_descriptive_type
# DW_AT_artificial
.long 0x1e4 # DW_AT_sibling
.uleb128 0x7 # (DIE (0x16a) DW_TAG_member)
.long .LASF4 # DW_AT_name: "max_size"
[snip]
The error occurs while Ada evaluator is trying to "fix"
the element type inside the array, so as to determine its actual
size. For that, it searches for a parallel "XVZ" variable,
which, when found, contains the object's actual size.
Unfortunately in our case, the variable exists but has been
optimized out, as seen by the presence of a variable DIE in
the debugging info, but with no address attribute:
.uleb128 0x18 # (DIE (0x24e) DW_TAG_variable)
.long .LASF31 # DW_AT_name: "fd__Tints_doubledC___XVZ"
.long 0x257 # DW_AT_type
# DW_AT_artificial
Discussing this with some members of AdaCore's compiler team,
it is expected that the optimizer can get rid of this variable,
and we don't want to pessimize the code just to improve debuggability,
since -O2 is about performance. So, the idea of this patch is
not to make it work, but provide a bit more information to help
users understand what kind of error is preventing GDB from being
able to print the variable's value.
The first hurdle we had to clear was the fact that ada_val_print
traps all exceptions (including QUIT ones!), and does so completly
silently. So, the fix was to add a trace of the exception being
generated. While doing so, we fix an old XXX/FIXME by only catching
errors, letting QUIT exceptions go through.
Once this is done, we now get an error message, which gives a first
clue as to what was happening:
(gdb) p fd.global
$1 = <error reading variable: value has been optimized out>
However, it would be more useful to know which value it was
that was optimized out. For that purpose, we enhanced
ada-lang.c::ada_to_fixed_type_1 so as to re-throw the error
with a message which indicates which variable we failed to read.
With those changes, the new output is now:
(gdb) p fd.global
$1 = <error reading variable: unable to read value of fd__Tints_doubledC___XVZ (value has been optimized out)>
gdb/ChangeLog:
* ada-lang.c (ada_to_fixed_type_1): Rethrow errors with
a more detailed exception message when getting an exception
while trying to read the value of an XVZ variable.
* ada-valprint.c (ada_val_print): Only catch RETURN_MASK_ERROR
exceptions. Print an error message when an exception is caught.
gdb/testsuite/ChangeLog:
* gdb.dwarf2/ada-valprint-error.c: New file.
* gdb.dwarf2/ada-valprint-error.exp: New file.
Tested on x86_64-linux
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