forked from Imagelibrary/binutils-gdb
973db6fae3
There are two methods to factor out type information in a dwarf4 executable:
- use -fdebug-info-types to generate type units in a .debug_types section, and
- use dwz to create partial units.
The dwz method has an extra benefit: it also allows to factor out information
between executables into a newly created .dwz file, pointed to by a
.gnu_debugaltlink section.
There is nothing prohibiting a .gnu_debugaltlink file to contain a
.debug_types section.
It's just not generated by dwz or any other tool atm, and consequently gdb has
no support for it. Enhancement PR symtab/30838 is open about the lack of
support.
Make the current situation explicit by emitting a dwarf error:
...
(gdb) file struct-with-sig-2^M
Reading symbols from struct-with-sig-2...^M
Dwarf Error: .debug_types section not supported in dwz file^M
...
and add an assert in write_gdbindex:
...
+ /* See enhancement PR symtab/30838. */
+ gdb_assert (!(per_cu->is_dwz && per_cu->is_debug_types));
...
to clarify why we can use:
...
data_buf &cu_list = (per_cu->is_debug_types
? types_cu_list
: per_cu->is_dwz ? dwz_cu_list : objfile_cu_list);
...
The test-case is a modified copy from gdb.dwarf2/struct-with-sig.exp, so it
keeps the copyright years range.
Tested on x86_64-linux.
Tested-By: Guinevere Larsen <blarsen@redhat.com>
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30838
129 lines
3.0 KiB
Plaintext
129 lines
3.0 KiB
Plaintext
# Copyright 2020-2023 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# Variant of struct-with-sig.exp where TUs are in .gnu_debugaltlink file.
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load_lib dwarf.exp
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# This test can only be run on targets which support DWARF-2 and use gas.
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require dwarf2_support
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standard_testfile main-foo.c .S .S
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set build_id [string repeat ff 20]
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# Make some DWARF for the dwz file.
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set asm_file [standard_output_file $srcfile2]
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Dwarf::assemble $asm_file {
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build_id $::build_id
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tu {} 0x0000000000000001 the_type_i {
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type_unit {} {
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declare_labels int_type
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the_type_i: structure_type {
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{name s}
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{byte_size 4 sdata}
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} {
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member {
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{name i}
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{type :$int_type}
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}
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}
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int_type: base_type {
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{name int}
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{encoding @DW_ATE_signed}
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{byte_size 4 sdata}
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}
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}
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}
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tu {} 0x0000000000000002 the_type_j {
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type_unit {} {
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declare_labels int_type
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the_type_j: structure_type {
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{name s}
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{byte_size 4 sdata}
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} {
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member {
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{name j}
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{type :$int_type}
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}
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}
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int_type: base_type {
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{name int}
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{encoding @DW_ATE_signed}
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{byte_size 4 sdata}
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}
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}
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}
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}
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# We're using an object instead of executable here to keep cc-with-tweaks.sh
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# from modifying it. It also means we can set the build-id, rather than
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# having to extract it.
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if { [gdb_compile $asm_file $binfile.dwz object {nodebug}] != "" } {
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return -1
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}
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set host_dwz_file [gdb_remote_download host $binfile.dwz]
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# Make some DWARF for the executable.
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set asm_file [standard_output_file $srcfile3]
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Dwarf::assemble $asm_file {
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gnu_debugaltlink $::host_dwz_file $::build_id
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cu {} {
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compile_unit {
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{DW_AT_language @DW_LANG_C}
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{DW_AT_name main.c}
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} {
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structure_type {
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{name s}
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{signature 0x0000000000000001 ref_sig8}
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{declaration 1 flag}
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}
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DW_TAG_subprogram {
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{MACRO_AT_func {main}}
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}
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}
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}
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cu {} {
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compile_unit {
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{DW_AT_language @DW_LANG_C}
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{DW_AT_name foo.c}
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} {
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structure_type {
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{name s}
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{signature 0x0000000000000002 ref_sig8}
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{declaration 1 flag}
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}
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DW_TAG_subprogram {
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{MACRO_AT_func {foo}}
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}
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}
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}
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}
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if { [prepare_for_testing "failed to prepare" ${testfile} \
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[list $srcfile $asm_file] {nodebug}] } {
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return -1
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}
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set re "Dwarf Error: .debug_types section not supported in dwz file"
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gdb_assert { [regexp $re $gdb_file_cmd_msg] } "Dwarf Error message"
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