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handle anti-dependency weak symbol

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This commit is contained in:
Nikita Smith
2025-08-18 15:38:06 -07:00
parent 31b2b1c0f7
commit b05237ceec
1 changed files with 14 additions and 16 deletions
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src/linker/lnk_symbol_table.c
+14 -16
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@@ -579,15 +579,10 @@ lnk_resolve_weak_symbol(LNK_SymbolTable *symtab, LNK_SymbolDefined symbol)
COFF_ParsedSymbol current_parsed = lnk_parsed_symbol_from_coff_symbol_idx(current_symbol.obj, current_symbol.symbol_idx);
COFF_SymbolValueInterpType current_interp = coff_interp_symbol(current_parsed.section_number, current_parsed.value, current_parsed.storage_class);
if (current_interp == COFF_SymbolValueInterp_Weak) {
// check for anti dependency
for (struct S *s = sf; s != 0; s = s->next) {
if (s->is_anti_dep) {
COFF_ParsedSymbol parsed_symbol = lnk_parsed_symbol_from_coff_symbol_idx(symbol.obj, symbol.symbol_idx);
lnk_error_obj(LNK_Error_UnresolvedSymbol, symbol.obj, "unresolved symbol %S", parsed_symbol.name);
MemoryZeroStruct(&current_symbol);
break;
}
}
// record visited symbol
struct S *s = push_array(scratch.arena, struct S, 1);
s->symbol = current_symbol;
SLLQueuePush(sf, sl, s);
// does weak symbol have a definition?
LNK_Symbol *defn_symbol = lnk_symbol_table_search(symtab, LNK_SymbolScope_Defined, current_parsed.name);
@@ -600,16 +595,18 @@ lnk_resolve_weak_symbol(LNK_SymbolTable *symtab, LNK_SymbolDefined symbol)
COFF_SymbolWeakExt *weak_ext = coff_parse_weak_tag(current_parsed, current_symbol.obj->header.is_big_obj);
// record visited symbol
struct S *s = push_array(scratch.arena, struct S, 1);
s->symbol = current_symbol;
s->is_anti_dep = weak_ext->characteristics == COFF_WeakExt_AntiDependency;
SLLQueuePush(sf, sl, s);
// no definition fallback to default symbol
// no definition -- fallback to default symbol
COFF_ParsedSymbol tag_parsed = lnk_parsed_symbol_from_coff_symbol_idx(current_symbol.obj, weak_ext->tag_index);
COFF_SymbolValueInterpType tag_interp = coff_interp_symbol(tag_parsed.section_number, tag_parsed.value, tag_parsed.storage_class);
current_symbol = (LNK_SymbolDefined){ .obj = current_symbol.obj, .symbol_idx = weak_ext->tag_index };
if (weak_ext->characteristics == COFF_WeakExt_AntiDependency) {
if (tag_interp == COFF_SymbolValueInterp_Undefined || tag_interp == COFF_SymbolValueInterp_Weak) {
LNK_Symbol *dep_symbol = lnk_symbol_table_search(symtab, LNK_SymbolScope_Defined, tag_parsed.name);
tag_interp = lnk_interp_from_symbol(dep_symbol);
}
if (tag_interp == COFF_SymbolValueInterp_Weak) { goto exit; }
}
} else if (current_interp == COFF_SymbolValueInterp_Undefined) {
LNK_Symbol *defn_symbol = lnk_symbol_table_search(symtab, LNK_SymbolScope_Defined, current_parsed.name);
COFF_SymbolValueInterpType defn_interp = lnk_interp_from_symbol(defn_symbol);
@@ -622,6 +619,7 @@ lnk_resolve_weak_symbol(LNK_SymbolTable *symtab, LNK_SymbolDefined symbol)
} else { break; }
}
exit:;
scratch_end(scratch);
return current_symbol;
}