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Fission support for multiple CUs per DWO file 

In some cases a compiler may produce a single object file (& thus single
DWO file) representing multiple source files. The most common example of
this is in whole program optimization (such as LLVM's LTO). Fission may
still be a beneficial feature to use here - to avoid the need to
read/link the debug info with system libraries and the like.

This change adds basic support for multiple CUs in a single DWO file to
support LLVM's output in this situation.

There is still outstanding work to design and implement a solution for
cross-CU references (usually using DW_FORM_ref_addr) in this scenario.
For now LLVM works around this by duplicating DIEs rather than making
cross-CU references in DWO files. This degrades debugger
behavior/quality especially for file-local entities.

2017-07-06  David Blaikie  <dblaikie@gmail.com>

	* dwarf2read.c (struct dwo_file): Use a htab of dwo_unit* (rather than
	a singular dwo_unit*) to support multiple CUs in the same way that
	multiple TUs are supported.
	(create_cus_hash_table): Replace create_dwo_cu with a function for
	parsing multiple CUs from a DWO file.
	(open_and_init_dwo_file): Use create_cus_hash_table rather than
	create_dwo_cu.
	(lookup_dwo_cutu): Lookup CU in the hash table in the dwo_file with
	htab_find, rather than comparing the signature to a singleton CU in
	the dwo_file.

2017-07-06  David Blaikie  <dblaikie@gmail.com>

	* gdb.dwarf2/fission-multi-cu.S: Test containing multiple CUs in a DWO,
	built from fissiont-multi-cu{1,2}.c.
	* gdb.dwarf2/fission-multi-cu.exp: Test similar to fission-base.exp,
	except putting 'main' and 'func' in separate CUs in the same DWO file.
	* gdb.dwarf2/fission-multi-cu1.c: First CU for the multi-CU-single-DWO
	test.
	* gdb.dwarf2/fission-multi-cu2.c: Second CU in the multi-CU-single-DWO
	test.
This commit is contained in:
David Blaikie 2017-07-06 11:17:52 -07:00
parent a0b7b10523
commit 33c5cd7587
7 changed files with 567 additions and 50 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
gdb/ChangeLog
View File

@ -1,3 +1,16 @@
2017-07-06 David Blaikie <dblaikie@gmail.com>
* dwarf2read.c (struct dwo_file): Use a htab of dwo_unit* (rather than
a singular dwo_unit*) to support multiple CUs in the same way that
multiple TUs are supported.
(create_cus_hash_table): Replace create_dwo_cu with a function for
parsing multiple CUs from a DWO file.
(open_and_init_dwo_file): Use create_cus_hash_table rather than
create_dwo_cu.
(lookup_dwo_cutu): Lookup CU in the hash table in the dwo_file with
htab_find, rather than comparing the signature to a singleton CU in
the dwo_file.
2017-07-06 Pedro Alves <palves@redhat.com>
* python/py-unwind.c (pyuw_dealloc_cache): Fix for loop condition.

106
gdb/dwarf2read.c
View File

@ -855,12 +855,11 @@ struct dwo_file
sections (for lack of a better name). */
struct dwo_sections sections;
/* The CU in the file.
We only support one because having more than one requires hacking the
dwo_name of each to match, which is highly unlikely to happen.
Doing this means all TUs can share comp_dir: We also assume that
DW_AT_comp_dir across all TUs in a DWO file will be identical. */
struct dwo_unit *cu;
/* 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. */
@ -9700,72 +9699,75 @@ create_dwo_cu_reader (const struct die_reader_specs *reader,
hex_string (dwo_unit->signature));
}
/* Create the dwo_unit for the lone CU in DWO_FILE.
/* Create the dwo_units for the CUs in a DWO_FILE.
Note: This function processes DWO files only, not DWP files. */
static struct dwo_unit *
create_dwo_cu (struct dwo_file *dwo_file)
static void
create_cus_hash_table (struct dwo_file &dwo_file, dwarf2_section_info &section,
htab_t &cus_htab)
{
struct objfile *objfile = dwarf2_per_objfile->objfile;
struct dwarf2_section_info *section = &dwo_file->sections.info;
const struct dwarf2_section_info *abbrev_section = &dwo_file.sections.abbrev;
const gdb_byte *info_ptr, *end_ptr;
struct create_dwo_cu_data create_dwo_cu_data;
struct dwo_unit *dwo_unit;
dwarf2_read_section (objfile, section);
info_ptr = section->buffer;
dwarf2_read_section (objfile, &section);
info_ptr = section.buffer;
if (info_ptr == NULL)
return NULL;
return;
if (dwarf_read_debug)
{
fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
get_section_name (section),
get_section_file_name (section));
get_section_name (&section),
get_section_file_name (&section));
}
create_dwo_cu_data.dwo_file = dwo_file;
dwo_unit = NULL;
end_ptr = info_ptr + section->size;
end_ptr = info_ptr + section.size;
while (info_ptr < end_ptr)
{
struct dwarf2_per_cu_data per_cu;
struct create_dwo_cu_data create_dwo_cu_data;
struct dwo_unit *dwo_unit;
void **slot;
sect_offset sect_off = (sect_offset) (info_ptr - section.buffer);
memset (&create_dwo_cu_data.dwo_unit, 0,
sizeof (create_dwo_cu_data.dwo_unit));
memset (&per_cu, 0, sizeof (per_cu));
per_cu.objfile = objfile;
per_cu.is_debug_types = 0;
per_cu.sect_off = sect_offset (info_ptr - section->buffer);
per_cu.section = section;
init_cutu_and_read_dies_no_follow (&per_cu, dwo_file,
create_dwo_cu_reader,
&create_dwo_cu_data);
if (create_dwo_cu_data.dwo_unit.dwo_file != NULL)
{
/* If we've already found one, complain. We only support one
because having more than one requires hacking the dwo_name of
each to match, which is highly unlikely to happen. */
if (dwo_unit != NULL)
{
complaint (&symfile_complaints,
_("Multiple CUs in DWO file %s [in module %s]"),
dwo_file->dwo_name, objfile_name (objfile));
break;
}
dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
*dwo_unit = create_dwo_cu_data.dwo_unit;
}
per_cu.sect_off = sect_offset (info_ptr - section.buffer);
per_cu.section = &section;
init_cutu_and_read_dies_no_follow (
&per_cu, &dwo_file, create_dwo_cu_reader, &create_dwo_cu_data);
info_ptr += per_cu.length;
}
return dwo_unit;
// If the unit could not be parsed, skip it.
if (create_dwo_cu_data.dwo_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 = create_dwo_cu_data.dwo_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 (&symfile_complaints,
_("debug cu entry at offset 0x%x is duplicate to"
" the entry at offset 0x%x, signature %s"),
to_underlying (sect_off), to_underlying (dup_sect_off),
hex_string (dwo_unit->signature));
}
*slot = (void *)dwo_unit;
}
}
/* DWP file .debug_{cu,tu}_index section format:
@ -10770,7 +10772,7 @@ open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu,
bfd_map_over_sections (dwo_file->dbfd, dwarf2_locate_dwo_sections,
&dwo_file->sections);
dwo_file->cu = create_dwo_cu (dwo_file);
create_cus_hash_table (*dwo_file, dwo_file->sections.info, dwo_file->cus);
create_debug_types_hash_table (dwo_file, dwo_file->sections.types,
dwo_file->tus);
@ -11137,10 +11139,14 @@ lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
dwo_cutu
= (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_cutu);
}
else if (!is_debug_types && dwo_file->cu)
else if (!is_debug_types && dwo_file->cus)
{
if (signature == dwo_file->cu->signature)
dwo_cutu = dwo_file->cu;
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)

11
gdb/testsuite/ChangeLog
View File

@ -1,3 +1,14 @@
2017-07-06 David Blaikie <dblaikie@gmail.com>
* gdb.dwarf2/fission-multi-cu.S: Test containing multiple CUs in a DWO,
built from fissiont-multi-cu{1,2}.c.
* gdb.dwarf2/fission-multi-cu.exp: Test similar to fission-base.exp,
except putting 'main' and 'func' in separate CUs in the same DWO file.
* gdb.dwarf2/fission-multi-cu1.c: First CU for the multi-CU-single-DWO
test.
* gdb.dwarf2/fission-multi-cu2.c: Second CU in the multi-CU-single-DWO
test.
2017-07-06 Pedro Alves <palves@redhat.com>
* gdb.python/py-unwind.exp: Test flushregs.

374
gdb/testsuite/gdb.dwarf2/fission-multi-cu.S Normal file
View File

@ -0,0 +1,374 @@
/* This testcase is part of GDB, the GNU debugger.
Copyright 2012-2017 Free Software Foundation, Inc.
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/>.
This file was created by doing:
clang fission-multi-cu*.c -g -fno-split-dwarf-inlining -emit-llvm -S -c
llvm-link fission-multi-cu*.ll -S -o fission-multi-cu.ll
clang-tot fission-multi-cu.ll -gsplit-dwarf -S
and then massaging the output.
*/
.text
.file "llvm-link"
.globl func
.p2align 4, 0x90
.type func,@function
func: # @func
.Lfunc_begin0:
.file 1 "fission-multi-cu1.c"
.loc 1 20 0 # fission-multi-cu1.c:20:0
.cfi_startproc
# BB#0: # %entry
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset %rbp, -16
movq %rsp, %rbp
.cfi_def_cfa_register %rbp
movl %edi, -4(%rbp)
.loc 1 21 10 prologue_end # fission-multi-cu1.c:21:10
movl -4(%rbp), %edi
.loc 1 21 14 is_stmt 0 # fission-multi-cu1.c:21:14
addl $1, %edi
.loc 1 21 3 # fission-multi-cu1.c:21:3
movl %edi, %eax
popq %rbp
retq
.Lfunc_end0:
.size func, .Lfunc_end0-func
.cfi_endproc
.globl main
.p2align 4, 0x90
.type main,@function
main: # @main
.Lfunc_begin1:
.file 2 "fission-multi-cu2.c"
.loc 2 23 0 is_stmt 1 # fission-multi-cu2.c:23:0
.cfi_startproc
# BB#0: # %entry
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset %rbp, -16
movq %rsp, %rbp
.cfi_def_cfa_register %rbp
movl $4294967295, %edi # imm = 0xFFFFFFFF
.loc 2 24 3 prologue_end # fission-multi-cu2.c:24:3
movb $0, %al
callq func
xorl %eax, %eax
.loc 2 25 1 # fission-multi-cu2.c:25:1
popq %rbp
retq
.Lfunc_end1:
.size main, .Lfunc_end1-main
.cfi_endproc
.section .debug_str,"MS",@progbits,1
.Lskel_string0:
.asciz "fission-multi-cu.dwo" # string offset=0
.Lskel_string1:
.asciz "/tmp/src/gdb/testsuite" # string offset=21
.section .debug_loc.dwo,"",@progbits
.section .debug_abbrev,"",@progbits
.byte 1 # Abbreviation Code
.byte 17 # DW_TAG_compile_unit
.byte 0 # DW_CHILDREN_no
.byte 16 # DW_AT_stmt_list
.byte 23 # DW_FORM_sec_offset
.ascii "\260B" # DW_AT_GNU_dwo_name
.byte 14 # DW_FORM_strp
.byte 27 # DW_AT_comp_dir
.byte 14 # DW_FORM_strp
.ascii "\261B" # DW_AT_GNU_dwo_id
.byte 7 # DW_FORM_data8
.ascii "\263B" # DW_AT_GNU_addr_base
.byte 23 # DW_FORM_sec_offset
.byte 17 # DW_AT_low_pc
.byte 1 # DW_FORM_addr
.byte 18 # DW_AT_high_pc
.byte 6 # DW_FORM_data4
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 0 # EOM(3)
.section .debug_info,"",@progbits
.Lcu_begin0:
.long 44 # Length of Unit
.short 4 # DWARF version number
.long .debug_abbrev # Offset Into Abbrev. Section
.byte 8 # Address Size (in bytes)
.byte 1 # Abbrev [1] 0xb:0x25 DW_TAG_compile_unit
.long .Lline_table_start0 # DW_AT_stmt_list
.long .Lskel_string0 # DW_AT_GNU_dwo_name
.long .Lskel_string1 # DW_AT_comp_dir
.quad 7615852067747431413 # DW_AT_GNU_dwo_id
.long .debug_addr # DW_AT_GNU_addr_base
.quad .Lfunc_begin0 # DW_AT_low_pc
.long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
.Lcu_begin1:
.long 44 # Length of Unit
.short 4 # DWARF version number
.long .debug_abbrev # Offset Into Abbrev. Section
.byte 8 # Address Size (in bytes)
.byte 1 # Abbrev [1] 0xb:0x25 DW_TAG_compile_unit
.long .Lline_table_start0 # DW_AT_stmt_list
.long .Lskel_string0 # DW_AT_GNU_dwo_name
.long .Lskel_string1 # DW_AT_comp_dir
.quad 2037650261599692324 # DW_AT_GNU_dwo_id
.long .debug_addr # DW_AT_GNU_addr_base
.quad .Lfunc_begin1 # DW_AT_low_pc
.long .Lfunc_end1-.Lfunc_begin1 # DW_AT_high_pc
.section .debug_ranges,"",@progbits
.section .debug_macinfo,"",@progbits
.Lcu_macro_begin1:
.Lcu_macro_begin3:
.byte 0 # End Of Macro List Mark
.section .debug_str.dwo,"MS",@progbits,1
.Linfo_string0:
.asciz "fission-multi-cu.dwo" # string offset=0
.Linfo_string1:
.asciz "clang version 5.0.0 (trunk 302855) (llvm/trunk 302853)" # string offset=21
.Linfo_string2:
.asciz "fission-multi-cu1.c" # string offset=76
.Linfo_string3:
.asciz "fission-multi-cu2.c" # string offset=96
.Linfo_string4:
.asciz "func" # string offset=116
.Linfo_string5:
.asciz "int" # string offset=121
.Linfo_string6:
.asciz "main" # string offset=125
.Linfo_string7:
.asciz "arg" # string offset=130
.section .debug_str_offsets.dwo,"",@progbits
.long 0
.long 21
.long 76
.long 96
.long 116
.long 121
.long 125
.long 130
.section .debug_info.dwo,"",@progbits
.long 53 # Length of Unit
.short 4 # DWARF version number
.long 0 # Offset Into Abbrev. Section
.byte 8 # Address Size (in bytes)
.byte 1 # Abbrev [1] 0xb:0x2e DW_TAG_compile_unit
.byte 0 # DW_AT_GNU_dwo_name
.byte 1 # DW_AT_producer
.short 12 # DW_AT_language
.byte 2 # DW_AT_name
.quad 7615852067747431413 # DW_AT_GNU_dwo_id
.byte 2 # Abbrev [2] 0x19:0x1b DW_TAG_subprogram
.byte 0 # DW_AT_low_pc
.long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
.byte 1 # DW_AT_frame_base
.byte 86
.byte 4 # DW_AT_name
.byte 1 # DW_AT_decl_file
.byte 19 # DW_AT_decl_line
# DW_AT_prototyped
.long 52 # DW_AT_type
# DW_AT_external
.byte 3 # Abbrev [3] 0x28:0xb DW_TAG_formal_parameter
.byte 2 # DW_AT_location
.byte 145
.byte 124
.byte 7 # DW_AT_name
.byte 1 # DW_AT_decl_file
.byte 19 # DW_AT_decl_line
.long 52 # DW_AT_type
.byte 0 # End Of Children Mark
.byte 4 # Abbrev [4] 0x34:0x4 DW_TAG_base_type
.byte 5 # DW_AT_name
.byte 5 # DW_AT_encoding
.byte 4 # DW_AT_byte_size
.byte 0 # End Of Children Mark
.long 41 # Length of Unit
.short 4 # DWARF version number
.long 0 # Offset Into Abbrev. Section
.byte 8 # Address Size (in bytes)
.byte 1 # Abbrev [1] 0xb:0x22 DW_TAG_compile_unit
.byte 0 # DW_AT_GNU_dwo_name
.byte 1 # DW_AT_producer
.short 12 # DW_AT_language
.byte 3 # DW_AT_name
.quad 2037650261599692324 # DW_AT_GNU_dwo_id
.byte 5 # Abbrev [5] 0x19:0xf DW_TAG_subprogram
.byte 1 # DW_AT_low_pc
.long .Lfunc_end1-.Lfunc_begin1 # DW_AT_high_pc
.byte 1 # DW_AT_frame_base
.byte 86
.byte 6 # DW_AT_name
.byte 2 # DW_AT_decl_file
.byte 22 # DW_AT_decl_line
.long 40 # DW_AT_type
# DW_AT_external
.byte 4 # Abbrev [4] 0x28:0x4 DW_TAG_base_type
.byte 5 # DW_AT_name
.byte 5 # DW_AT_encoding
.byte 4 # DW_AT_byte_size
.byte 0 # End Of Children Mark
.section .debug_abbrev.dwo,"",@progbits
.byte 1 # Abbreviation Code
.byte 17 # DW_TAG_compile_unit
.byte 1 # DW_CHILDREN_yes
.ascii "\260B" # DW_AT_GNU_dwo_name
.ascii "\202>" # DW_FORM_GNU_str_index
.byte 37 # DW_AT_producer
.ascii "\202>" # DW_FORM_GNU_str_index
.byte 19 # DW_AT_language
.byte 5 # DW_FORM_data2
.byte 3 # DW_AT_name
.ascii "\202>" # DW_FORM_GNU_str_index
.ascii "\261B" # DW_AT_GNU_dwo_id
.byte 7 # DW_FORM_data8
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 2 # Abbreviation Code
.byte 46 # DW_TAG_subprogram
.byte 1 # DW_CHILDREN_yes
.byte 17 # DW_AT_low_pc
.ascii "\201>" # DW_FORM_GNU_addr_index
.byte 18 # DW_AT_high_pc
.byte 6 # DW_FORM_data4
.byte 64 # DW_AT_frame_base
.byte 24 # DW_FORM_exprloc
.byte 3 # DW_AT_name
.ascii "\202>" # DW_FORM_GNU_str_index
.byte 58 # DW_AT_decl_file
.byte 11 # DW_FORM_data1
.byte 59 # DW_AT_decl_line
.byte 11 # DW_FORM_data1
.byte 39 # DW_AT_prototyped
.byte 25 # DW_FORM_flag_present
.byte 73 # DW_AT_type
.byte 19 # DW_FORM_ref4
.byte 63 # DW_AT_external
.byte 25 # DW_FORM_flag_present
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 3 # Abbreviation Code
.byte 5 # DW_TAG_formal_parameter
.byte 0 # DW_CHILDREN_no
.byte 2 # DW_AT_location
.byte 24 # DW_FORM_exprloc
.byte 3 # DW_AT_name
.ascii "\202>" # DW_FORM_GNU_str_index
.byte 58 # DW_AT_decl_file
.byte 11 # DW_FORM_data1
.byte 59 # DW_AT_decl_line
.byte 11 # DW_FORM_data1
.byte 73 # DW_AT_type
.byte 19 # DW_FORM_ref4
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 4 # Abbreviation Code
.byte 36 # DW_TAG_base_type
.byte 0 # DW_CHILDREN_no
.byte 3 # DW_AT_name
.ascii "\202>" # DW_FORM_GNU_str_index
.byte 62 # DW_AT_encoding
.byte 11 # DW_FORM_data1
.byte 11 # DW_AT_byte_size
.byte 11 # DW_FORM_data1
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 5 # Abbreviation Code
.byte 46 # DW_TAG_subprogram
.byte 0 # DW_CHILDREN_no
.byte 17 # DW_AT_low_pc
.ascii "\201>" # DW_FORM_GNU_addr_index
.byte 18 # DW_AT_high_pc
.byte 6 # DW_FORM_data4
.byte 64 # DW_AT_frame_base
.byte 24 # DW_FORM_exprloc
.byte 3 # DW_AT_name
.ascii "\202>" # DW_FORM_GNU_str_index
.byte 58 # DW_AT_decl_file
.byte 11 # DW_FORM_data1
.byte 59 # DW_AT_decl_line
.byte 11 # DW_FORM_data1
.byte 73 # DW_AT_type
.byte 19 # DW_FORM_ref4
.byte 63 # DW_AT_external
.byte 25 # DW_FORM_flag_present
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 0 # EOM(3)
.section .debug_line.dwo,"",@progbits
.Ltmp4:
.long (.Ltmp5-.Ltmp4)-4
.short 2
.long (.Ltmp6-.Ltmp4)-10
.byte 1
.byte 1
.byte -5
.byte 14
.byte 1
.byte 0
.byte 0
.Ltmp6:
.Ltmp5:
.section .debug_addr,"",@progbits
.quad .Lfunc_begin0
.quad .Lfunc_begin1
.section .debug_pubnames,"",@progbits
.long .LpubNames_end0-.LpubNames_begin0 # Length of Public Names Info
.LpubNames_begin0:
.short 2 # DWARF Version
.long .Lcu_begin0 # Offset of Compilation Unit Info
.long 48 # Compilation Unit Length
.long 25 # DIE offset
.asciz "func" # External Name
.long 0 # End Mark
.LpubNames_end0:
.long .LpubNames_end1-.LpubNames_begin1 # Length of Public Names Info
.LpubNames_begin1:
.short 2 # DWARF Version
.long .Lcu_begin1 # Offset of Compilation Unit Info
.long 48 # Compilation Unit Length
.long 25 # DIE offset
.asciz "main" # External Name
.long 0 # End Mark
.LpubNames_end1:
.section .debug_pubtypes,"",@progbits
.long .LpubTypes_end0-.LpubTypes_begin0 # Length of Public Types Info
.LpubTypes_begin0:
.short 2 # DWARF Version
.long .Lcu_begin0 # Offset of Compilation Unit Info
.long 48 # Compilation Unit Length
.long 52 # DIE offset
.asciz "int" # External Name
.long 0 # End Mark
.LpubTypes_end0:
.long .LpubTypes_end1-.LpubTypes_begin1 # Length of Public Types Info
.LpubTypes_begin1:
.short 2 # DWARF Version
.long .Lcu_begin1 # Offset of Compilation Unit Info
.long 48 # Compilation Unit Length
.long 40 # DIE offset
.asciz "int" # External Name
.long 0 # End Mark
.LpubTypes_end1:
.ident "clang version 5.0.0 (trunk 302855) (llvm/trunk 302853)"
.ident "clang version 5.0.0 (trunk 302855) (llvm/trunk 302853)"
.section ".note.GNU-stack","",@progbits
.section .debug_line,"",@progbits
.Lline_table_start0:

67
gdb/testsuite/gdb.dwarf2/fission-multi-cu.exp Normal file
View File

@ -0,0 +1,67 @@
# Copyright 2012-2017 Free Software Foundation, Inc.
# 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/>.
load_lib dwarf.exp
# We run objcopy locally to split out the .dwo file.
if [is_remote host] {
return 0
}
# This test can only be run on targets which support DWARF-2 and use gas.
if ![dwarf2_support] {
return 0
}
# This test can only be run on x86-64 targets.
if {![istarget x86_64-*] || ![is_lp64_target]} {
return 0
}
standard_testfile .S
if [build_executable_from_fission_assembler \
"$testfile.exp" "$binfile" "$srcfile" {nodebug}] {
return -1
}
gdb_exit
gdb_start
gdb_reinitialize_dir $srcdir/$subdir
# Make sure we can find the .dwo file, regardless of whether we're
# running in parallel mode.
gdb_test_no_output "set debug-file-directory [file dirname $binfile]" \
"set debug-file-directory"
gdb_load $binfile
if ![runto_main] {
return -1
}
# Do a few basic things to verify we're finding the DWO debug info.
gdb_test "ptype main" "type = int \\(\\)"
gdb_test "ptype func" "type = int \\(int\\)"
gdb_test "frame" "#0 *main \\(\\) at ${testfile}2\\.c:$decimal.*" \
"frame in main"
gdb_test "break func" "Breakpoint.*at.* file .*${testfile}1\\.c, line .*"
gdb_test "continue" "Breakpoint.* func \\(arg=-1\\).*" \
"continue to func"
gdb_test "frame" "#0 *func \\(arg=-1\\) at ${testfile}1\\.c:$decimal.*" \
"frame in func"

22
gdb/testsuite/gdb.dwarf2/fission-multi-cu1.c Normal file
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@ -0,0 +1,22 @@
/* This testcase is part of GDB, the GNU debugger.
Copyright 2012-2017 Free Software Foundation, Inc.
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/>. */
int
func (int arg)
{
return arg + 1;
}

24
gdb/testsuite/gdb.dwarf2/fission-multi-cu2.c Normal file
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@ -0,0 +1,24 @@
/* This testcase is part of GDB, the GNU debugger.
Copyright 2012-2017 Free Software Foundation, Inc.
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/>. */
void func ();
int
main ()
{
func (-1);
}