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helper for checking if ELF has DWARF debug sections

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This commit is contained in:
Nikita Smith
2025-03-22 23:29:22 -07:00
parent b9c4774786
commit a84028d67a
4 changed files with 129 additions and 51 deletions
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src/dwarf/dwarf_coff.c
+63 -2
View File
@@ -1,7 +1,68 @@
// Copyright (c) 2024 Epic Games Tools
// Licensed under the MIT license (https://opensource.org/license/mit/)
#pragma once
internal B32
dw_is_dwarf_present_coff_section_table(String8 raw_image,
U64 string_table_off,
U64 section_count,
COFF_SectionHeader *sections)
{
B32 is_dwarf_present = 0;
for (U64 i = 0; i < section_count; ++i) {
COFF_SectionHeader *header = &sections[i];
String8 name = coff_name_from_section_header(raw_image, header, string_table_off);
DW_SectionKind s = dw_section_kind_from_string(name);
if (s == DW_Section_Null) {
s = dw_section_dwo_kind_from_string(name);
}
is_dwarf_present = s != DW_Section_Null;
if (is_dwarf_present) {
break;
}
}
return is_dwarf_present;
}
internal DW_Input
dw_input_from_coff_section_table(Arena *arena,
String8 raw_image,
U64 string_table_off,
U64 section_count,
COFF_SectionHeader *sections)
{
DW_Input input = {0};
B32 sect_status[ArrayCount(input.sec)] = {0};
for (U64 i = 0; i < section_count; ++i) {
COFF_SectionHeader *header = &sections[i];
Rng1U64 raw_data_range = rng_1u64(header->foff, header->foff + header->fsize);
String8 name = coff_name_from_section_header(raw_image, header, string_table_off);
DW_SectionKind s = dw_section_kind_from_string(name);
B32 is_dwo = 0;
if (s == DW_Section_Null) {
s = dw_section_dwo_kind_from_string(name);
is_dwo = 1;
}
if (s != DW_Section_Null) {
if (sect_status[s]) {
Assert(!"too many debug sections with identical name, picking first");
} else {
sect_status[s] = 1;
DW_Section *d = &input.sec[s];
d->name = push_str8_copy(arena, name);
d->data = str8_substr(raw_image, raw_data_range);
d->is_dwo = is_dwo;
}
}
}
return input;
}
internal DW_Input dw_input_from_coff_section_table(Arena *arena, String8 raw_image, U64 string_table_off, U64 section_count, COFF_SectionHeader *sections);
src/dwarf/dwarf_coff.h
+4 -38
View File
@@ -1,44 +1,10 @@
// Copyright (c) 2024 Epic Games Tools
// Licensed under the MIT license (https://opensource.org/license/mit/)
internal DW_Input
dw_input_from_coff_section_table(Arena *arena,
String8 raw_image,
U64 string_table_off,
U64 section_count,
COFF_SectionHeader *sections)
{
DW_Input input = {0};
B32 sect_status[ArrayCount(input.sec)] = {0};
#ifndef DWARF_COFF_H
#define DWARF_COFF_H
for (U64 i = 0; i < section_count; ++i) {
COFF_SectionHeader *header = &sections[i];
Rng1U64 raw_data_range = rng_1u64(header->foff, header->foff + header->fsize);
String8 name = coff_name_from_section_header(raw_image, header, string_table_off);
DW_SectionKind s = DW_Section_Null;
B32 is_dwo = 0;
#define X(_K,_L,_M,_W) \
if (str8_match_lit(_L, name, 0)) { s = DW_Section_##_K; } \
if (str8_match_lit(_M, name, 0)) { s = DW_Section_##_K; } \
if (str8_match_lit(_W, name, 0)) { s = DW_Section_##_K; is_dwo = 1; }
DW_SectionKind_XList(X)
#undef X
if (s != DW_Section_Null) {
if (sect_status[s]) {
Assert(!"too many debug sections with identical name, picking first");
} else {
sect_status[s] = 1;
DW_Section *d = &input.sec[s];
d->name = push_str8_copy(arena, name);
d->data = str8_substr(raw_image, raw_data_range);
d->is_dwo = is_dwo;
}
}
}
return input;
}
internal DW_Input dw_input_from_coff_section_table(Arena *arena, String8 raw_image, U64 string_table_off, U64 section_count, COFF_SectionHeader *sections);
#endif // DWARF_COFF_H
src/dwarf/dwarf_elf.c
+39 -11
View File
@@ -1,6 +1,38 @@
// Copyright (c) 2025 Epic Games Tools
// Licensed under the MIT license (https://opensource.org/license/mit/)
internal B32
dw_is_dwarf_present_elf_section_table(String8 raw_image, ELF_BinInfo *bin)
{
Temp scratch = scratch_begin(0,0);
B32 is_dwarf_present = 0;
ELF_Shdr64Array sections = elf_shdr64_array_from_bin(scratch.arena, raw_image, &bin->hdr);
for (U64 i = 0; i < sections.count; ++i) {
ELF_Shdr64 *shdr = &sections.v[i];
String8 name = elf_name_from_shdr64(raw_image, &bin->hdr, bin->sh_name_range, shdr);
if (shdr->sh_type != ELF_SectionCode_ProgBits) {
continue;
}
DW_SectionKind s = dw_section_kind_from_string(name);
if (s == DW_Section_Null) {
s = dw_section_dwo_kind_from_string(name);
}
is_dwarf_present = s != DW_Section_Null;
if (is_dwarf_present) {
break;
}
}
scratch_end(scratch);
return is_dwarf_present;
}
internal DW_Input
dw_input_from_elf_section_table(Arena *arena, String8 raw_image, ELF_BinInfo *bin)
{
@@ -10,7 +42,6 @@ dw_input_from_elf_section_table(Arena *arena, String8 raw_image, ELF_BinInfo *bi
B32 sect_status[ArrayCount(result.sec)] = {0};
ELF_Shdr64Array sections = elf_shdr64_array_from_bin(scratch.arena, raw_image, &bin->hdr);
String8 sh_names = str8_substr(raw_image, bin->sh_name_range);
for (U64 sect_idx = 1; sect_idx < sections.count; ++sect_idx) {
ELF_Shdr64 *shdr = &sections.v[sect_idx];
@@ -20,17 +51,14 @@ dw_input_from_elf_section_table(Arena *arena, String8 raw_image, ELF_BinInfo *bi
continue;
}
String8 name = {0};
str8_deserial_read_cstr(sh_names, shdr->sh_name, &name);
String8 name = elf_name_from_shdr64(raw_image, &bin->hdr, bin->sh_name_range, shdr);
DW_SectionKind s = DW_Section_Null;
B32 is_dwo = 0;
#define X(_K,_L,_M,_W) \
if (str8_match_lit(_L, name, 0)) { s = DW_Section_##_K; } \
if (str8_match_lit(_M, name, 0)) { s = DW_Section_##_K; } \
if (str8_match_lit(_W, name, 0)) { s = DW_Section_##_K; is_dwo = 1; }
DW_SectionKind_XList(X)
#undef X
DW_SectionKind s = dw_section_kind_from_string(name);
B32 is_dwo = 0;
if (s == DW_Section_Null) {
s = dw_section_dwo_kind_from_string(name);
is_dwo = 1;
}
if (s != DW_Section_Null) {
if (sect_status[s]) {
src/dwarf/dwarf_parse.c
+23
View File
@@ -169,6 +169,29 @@ str8_deserial_read_sleb128_array(Arena *arena, String8 string, U64 off, U64 coun
return bytes_read;
}
internal DW_SectionKind
dw_section_kind_from_string(String8 string)
{
DW_SectionKind s = DW_Section_Null;
#define X(_K,_L,_M,_W) \
if (str8_match_lit(_L, string, 0)) { s = DW_Section_##_K; } \
if (str8_match_lit(_M, string, 0)) { s = DW_Section_##_K; }
DW_SectionKind_XList(X)
#undef X
return s;
}
internal DW_SectionKind
dw_section_dwo_kind_from_string(String8 string)
{
DW_SectionKind s = DW_Section_Null;
#define X(_K,_L,_M,_W) \
if (str8_match_lit(_W, string, 0)) { s = DW_Section_##_K; }
DW_SectionKind_XList(X)
#undef X
return s;
}
internal Rng1U64List
dw_unit_ranges_from_data(Arena *arena, String8 data)
{