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extract hotpatch flag from compile symbol

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This commit is contained in:
Nikita Smith
2025-06-25 10:53:24 -07:00
committed by Ryan Fleury
parent a5119e3b51
commit bbb825adf4
4 changed files with 51 additions and 2 deletions
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src/linker/lnk_obj.c
+40
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@@ -224,6 +224,45 @@ THREAD_POOL_TASK_FUNC(lnk_obj_initer)
scratch_end(scratch);
}
//
// Extract obj features from compile symbol in .debug$S
//
B8 hotpatch = 0;
{
Temp scratch = scratch_begin(&arena, 1);
CV_Symbol comp_symbol = {0};
for (U64 sect_idx = 0; sect_idx < obj->header.section_count_no_null; sect_idx += 1) {
COFF_SectionHeader *sect_header = &coff_section_table[sect_idx];
String8 name = str8_cstring_capped_reverse(sect_header->name, sect_header->name+sizeof(sect_header->name));
if (str8_match(name, str8_lit(".debug$S"), 0)) {
Temp temp = temp_begin(scratch.arena);
String8 debug_s_data = str8_substr(input->data, rng_1u64(sect_header->foff, sect_header->foff+sect_header->fsize));
CV_DebugS debug_s = cv_parse_debug_s(temp.arena, debug_s_data);
for (String8Node *symbols_n = debug_s.data_list[CV_C13SubSectionIdxKind_Symbols].first; symbols_n != 0; symbols_n = symbols_n->next) {
CV_SymbolList symbol_list = {0};
cv_parse_symbol_sub_section_capped(scratch.arena, &symbol_list, 0, symbols_n->string, CV_SymbolAlign, 2);
if (symbol_list.first->data.kind == CV_SymKind_COMPILE3) {
comp_symbol = symbol_list.first->data;
goto found_comp_symbol;
} else if (symbol_list.last->data.kind == CV_SymKind_COMPILE3) {
comp_symbol = symbol_list.last->data;
goto found_comp_symbol;
}
}
temp_end(temp);
}
}
found_comp_symbol:;
if (comp_symbol.kind == CV_SymKind_COMPILE3 && comp_symbol.data.size >= sizeof(CV_SymCompile3)) {
CV_SymCompile3 *comp = (CV_SymCompile3 *)comp_symbol.data.str;
hotpatch = !!(comp->flags & CV_Compile3Flag_HotPatch);
}
scratch_end(scratch);
}
// fill out obj
obj->data = input->data;
@@ -232,6 +271,7 @@ THREAD_POOL_TASK_FUNC(lnk_obj_initer)
obj->input_idx = obj_idx;
obj->header = header;
obj->comdats = comdats;
obj->hotpatch = hotpatch;
ProfEnd();
}