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mark referenced symbols as live for unresolved-symbol detection

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This commit is contained in:
Nikita Smith
2025-08-08 15:54:21 -07:00
parent 9893a8135d
commit 7466da1479
6 changed files with 113 additions and 22 deletions
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src/torture/torture.c
+83
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@@ -743,6 +743,87 @@ exit:;
return result;
}
internal T_Result
t_link_undef(void)
{
Temp scratch = scratch_begin(0,0);
T_Result result = T_Result_Fail;
String8 undef_obj;
{
COFF_ObjWriter *obj_writer = coff_obj_writer_alloc(0,COFF_MachineType_X64);
coff_obj_writer_push_symbol_undef(obj_writer, str8_lit("undef"));
undef_obj = coff_obj_writer_serialize(scratch.arena, obj_writer);
coff_obj_writer_release(&obj_writer);
}
String8 entry_obj;
{
COFF_ObjWriter *obj_writer = coff_obj_writer_alloc(0, COFF_MachineType_X64);
U8 text[] = {
0x48, 0xC7, 0xC0, 0x00, 0x00, 0x00, 0x00, // mov rax, $imm
0xC3 // ret
};
COFF_ObjSection *sect = coff_obj_writer_push_section(obj_writer, str8_lit(".text"), PE_TEXT_SECTION_FLAGS, str8_array_fixed(text));
coff_obj_writer_push_symbol_extern(obj_writer, str8_lit("entry"), 0, sect);
COFF_ObjSymbol *symbol = coff_obj_writer_push_symbol_undef(obj_writer, str8_lit("undef"));
coff_obj_writer_section_push_reloc_voff(obj_writer, sect, 0, symbol);
entry_obj = coff_obj_writer_serialize(scratch.arena, obj_writer);
coff_obj_writer_release(&obj_writer);
}
if (!t_write_file(str8_lit("undef.obj"), undef_obj)) { goto exit; }
if (!t_write_file(str8_lit("entry.obj"), entry_obj)) { goto exit; }
// try linking unresolved symbol and see if linker picks up on that
int linker_exit_code = t_invoke_linkerf("/subsystem:console /entry:entry /out:a.exe entry.obj undef.obj");
if (linker_exit_code != LNK_Error_UnresolvedSymbol) { goto exit; }
result = T_Result_Pass;
exit:;
scratch_end(scratch);
return result;
}
internal T_Result
t_link_unref_undef(void)
{
Temp scratch = scratch_begin(0,0);
T_Result result = T_Result_Fail;
String8 undef_obj;
{
COFF_ObjWriter *obj_writer = coff_obj_writer_alloc(0,COFF_MachineType_X64);
coff_obj_writer_push_symbol_undef(obj_writer, str8_lit("undef"));
undef_obj = coff_obj_writer_serialize(scratch.arena, obj_writer);
coff_obj_writer_release(&obj_writer);
}
String8 entry_obj;
{
COFF_ObjWriter *obj_writer = coff_obj_writer_alloc(0, COFF_MachineType_X64);
U8 text[] = {
0xC3 // ret
};
COFF_ObjSection *sect = coff_obj_writer_push_section(obj_writer, str8_lit(".text"), PE_TEXT_SECTION_FLAGS, str8_array_fixed(text));
coff_obj_writer_push_symbol_extern(obj_writer, str8_lit("entry"), 0, sect);
entry_obj = coff_obj_writer_serialize(scratch.arena, obj_writer);
coff_obj_writer_release(&obj_writer);
}
if (!t_write_file(str8_lit("undef.obj"), undef_obj)) { goto exit; }
if (!t_write_file(str8_lit("entry.obj"), entry_obj)) { goto exit; }
// try linking unreferenced unresolved symbol, this must link
int linker_exit_code = t_invoke_linkerf("/subsystem:console /entry:entry /out:a.exe entry.obj undef.obj");
if (linker_exit_code != 0) { goto exit; }
result = T_Result_Pass;
exit:;
scratch_end(scratch);
return result;
}
internal T_Result
t_weak_vs_weak(void)
{
@@ -3910,6 +3991,8 @@ entry_point(CmdLine *cmdline)
{ "merge", t_merge },
{ "undef_section", t_undef_section },
{ "undef_reloc_section", t_undef_reloc_section },
{ "link_undef", t_link_undef },
{ "link_unref_undef", t_link_unref_undef },
{ "weak_vs_weak", t_weak_vs_weak },
{ "weak_vs_common", t_weak_vs_common },
{ "abs_vs_weak", t_abs_vs_weak },