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author | David Blaikie <dblaikie@gmail.com> | 2017-07-06 11:17:52 -0700 |
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committer | David Blaikie <dblaikie@gmail.com> | 2017-07-06 11:59:39 -0700 |
commit | 33c5cd75874c36374c0966c59feeaf6f17512499 (patch) | |
tree | 0606b4459c84ace78bd44375949527e38079b470 | |
parent | a0b7b105236d5bc65e8d3a35f1b4f34bcc5e3705 (diff) | |
download | gdb-33c5cd75874c36374c0966c59feeaf6f17512499.zip gdb-33c5cd75874c36374c0966c59feeaf6f17512499.tar.gz gdb-33c5cd75874c36374c0966c59feeaf6f17512499.tar.bz2 |
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.
-rw-r--r-- | gdb/ChangeLog | 13 | ||||
-rw-r--r-- | gdb/dwarf2read.c | 100 | ||||
-rw-r--r-- | gdb/testsuite/ChangeLog | 11 | ||||
-rw-r--r-- | gdb/testsuite/gdb.dwarf2/fission-multi-cu.S | 374 | ||||
-rw-r--r-- | gdb/testsuite/gdb.dwarf2/fission-multi-cu.exp | 67 | ||||
-rw-r--r-- | gdb/testsuite/gdb.dwarf2/fission-multi-cu1.c | 22 | ||||
-rw-r--r-- | gdb/testsuite/gdb.dwarf2/fission-multi-cu2.c | 24 |
7 files changed, 564 insertions, 47 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 7908142..a474077 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -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. diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c index 2f70bd2..0fdcd42 100644 --- a/gdb/dwarf2read.c +++ b/gdb/dwarf2read.c @@ -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 §ion, + 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, §ion); + 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 (§ion), + get_section_file_name (§ion)); } - 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; + per_cu.sect_off = sect_offset (info_ptr - section.buffer); + per_cu.section = §ion; + + init_cutu_and_read_dies_no_follow ( + &per_cu, &dwo_file, create_dwo_cu_reader, &create_dwo_cu_data); + info_ptr += per_cu.length; + + // If the unit could not be parsed, skip it. + if (create_dwo_cu_data.dwo_unit.dwo_file == NULL) + continue; - init_cutu_and_read_dies_no_follow (&per_cu, dwo_file, - create_dwo_cu_reader, - &create_dwo_cu_data); + if (cus_htab == NULL) + cus_htab = allocate_dwo_unit_table (objfile); - if (create_dwo_cu_data.dwo_unit.dwo_file != NULL) + 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) { - /* 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; - } + const struct dwo_unit *dup_cu = (const struct dwo_unit *)*slot; + sect_offset dup_sect_off = dup_cu->sect_off; - dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit); - *dwo_unit = create_dwo_cu_data.dwo_unit; + 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)); } - - info_ptr += per_cu.length; + *slot = (void *)dwo_unit; } - - return 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) diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog index d6a7252..8f28f44 100644 --- a/gdb/testsuite/ChangeLog +++ b/gdb/testsuite/ChangeLog @@ -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. diff --git a/gdb/testsuite/gdb.dwarf2/fission-multi-cu.S b/gdb/testsuite/gdb.dwarf2/fission-multi-cu.S new file mode 100644 index 0000000..d09a7e5 --- /dev/null +++ b/gdb/testsuite/gdb.dwarf2/fission-multi-cu.S @@ -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: diff --git a/gdb/testsuite/gdb.dwarf2/fission-multi-cu.exp b/gdb/testsuite/gdb.dwarf2/fission-multi-cu.exp new file mode 100644 index 0000000..1f23c5b6 --- /dev/null +++ b/gdb/testsuite/gdb.dwarf2/fission-multi-cu.exp @@ -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" diff --git a/gdb/testsuite/gdb.dwarf2/fission-multi-cu1.c b/gdb/testsuite/gdb.dwarf2/fission-multi-cu1.c new file mode 100644 index 0000000..d93e2f9 --- /dev/null +++ b/gdb/testsuite/gdb.dwarf2/fission-multi-cu1.c @@ -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; +} diff --git a/gdb/testsuite/gdb.dwarf2/fission-multi-cu2.c b/gdb/testsuite/gdb.dwarf2/fission-multi-cu2.c new file mode 100644 index 0000000..053b3ea --- /dev/null +++ b/gdb/testsuite/gdb.dwarf2/fission-multi-cu2.c @@ -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); +} |