birth-software/bloat-buster
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Properly construct .debug_line_str

Browse Source
This commit is contained in:
David Gonzalez Martin 2024-09-22 07:35:45 -06:00 committed by David
parent 1b41ea320c
commit fca4453d1e
1 changed files with 24 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
bootstrap/main.c
View File

@ -8729,7 +8729,7 @@ may_be_unused fn void write_elf(Thread* thread, const ObjectOptions* const restr
auto name = elf_get_section_name(builder, strlit(".rodata")); auto name = elf_get_section_name(builder, strlit(".rodata"));
u32 _IO_stdin_used = 0x20001; u32 _IO_stdin_used = 0x20001;
u32 data[] = {0x20001}; u32 data[] = {_IO_stdin_used};
_IO_stdin_used_size = sizeof(_IO_stdin_used); _IO_stdin_used_size = sizeof(_IO_stdin_used);
auto size = sizeof(data); auto size = sizeof(data);
@ -9687,6 +9687,7 @@ may_be_unused fn void write_elf(Thread* thread, const ObjectOptions* const restr
}; };
} }
VirtualBuffer(u8) debug_line_str = {};
{ {
// .debug_line // .debug_line
auto* section_header = vb_add(&builder->section_headers, 1); auto* section_header = vb_add(&builder->section_headers, 1);
@ -9752,7 +9753,15 @@ may_be_unused fn void write_elf(Thread* thread, const ObjectOptions* const restr
uleb128_encode(&builder->file, descriptor.form); uleb128_encode(&builder->file, descriptor.form);
} }
u32 paths[] = { 0 }; // TODO:
u8 directory_index = 0;
auto directory_string_offset = debug_line_str.length;
{
auto string = strlit("/home/david/minimal");
auto string_size = string.length + 1;
memcpy(vb_add(&debug_line_str, string_size), string.pointer, string_size);
}
u32 paths[] = { directory_string_offset };
auto directory_count = array_length(paths); auto directory_count = array_length(paths);
uleb128_encode(&builder->file, directory_count); uleb128_encode(&builder->file, directory_count);
@ -9793,10 +9802,17 @@ may_be_unused fn void write_elf(Thread* thread, const ObjectOptions* const restr
md5_hash = md5_end(&md5); md5_hash = md5_end(&md5);
#endif #endif
auto filename_string_offset = debug_line_str.length;
{
auto string = strlit("main.c");
auto string_size = string.length + 1;
memcpy(vb_add(&debug_line_str, string_size), string.pointer, string_size);
}
FilenameEntry filenames[] = { FilenameEntry filenames[] = {
{ {
0x14, filename_string_offset,
0, directory_index,
md5_hash, md5_hash,
}, },
}; };
@ -9830,11 +9846,12 @@ may_be_unused fn void write_elf(Thread* thread, const ObjectOptions* const restr
*(u64*)vb_add(&builder->file, sizeof(u64)) = main_offset; *(u64*)vb_add(&builder->file, sizeof(u64)) = main_offset;
} }
// TODO: does this have to do with "main.c"?
*vb_add(&builder->file, 1) = 0x14; // 14, address += 0, line += 2, op-index += 0 *vb_add(&builder->file, 1) = 0x14; // 14, address += 0, line += 2, op-index += 0
// Advance PC by 3 // Advance PC by 3
*vb_add(&builder->file, 1) = DW_LNS_advance_pc; *vb_add(&builder->file, 1) = DW_LNS_advance_pc;
*vb_add(&builder->file, 1) = 0x03; *vb_add(&builder->file, 1) = main_size;
{ {
// TODO: confirm this is the encoding of special opcodes? // TODO: confirm this is the encoding of special opcodes?
@ -9954,19 +9971,8 @@ may_be_unused fn void write_elf(Thread* thread, const ObjectOptions* const restr
auto name = elf_get_section_name(builder, strlit(".debug_line_str")); auto name = elf_get_section_name(builder, strlit(".debug_line_str"));
String strings[] = { auto size = debug_line_str.length;
strlit("/home/david/minimal"), memcpy(vb_add(&builder->file, size), debug_line_str.pointer, size);
strlit("main.c"),
};
for (u32 i = 0; i < array_length(strings); i += 1)
{
String string = strings[i];
auto string_length = string.length + 1;
memcpy(vb_add(&builder->file, string_length), string.pointer, string_length);
}
auto size = builder->file.length - offset;
*section_header = (ELFSectionHeader) { *section_header = (ELFSectionHeader) {
.name_offset = name, .name_offset = name,