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validate attrib-form encoding

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This commit is contained in:
Nikita Smith
2026-02-18 00:54:18 -08:00
parent 516365e97b
commit f9e36b5517
1 changed files with 29 additions and 0 deletions
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src/dwarf/dwarf_writer.c
+29
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@@ -218,6 +218,35 @@ dw_writer_tag_end(DW_Writer *writer)
internal DW_WriterAttrib *
dw_writer_push_attrib(DW_Writer *writer, DW_AttribKind kind, DW_WriterForm form)
{
// validate attribute-form encoding
B32 is_enc_legal = 0;
DW_AttribClass attrib_class = dw_attrib_class_from_attrib(writer->version, DW_Ext_Null, kind);
for (DW_AttribClass f = attrib_class; f != 0; f &= f - 1) {
DW_AttribClass v = f & -f;
switch (v) {
case DW_AttribClass_Null: { is_enc_legal = (form.kind == DW_WriterFormKind_Null); } break;
case DW_AttribClass_Undefined: { is_enc_legal = 0; } break;
case DW_AttribClass_Address: { is_enc_legal = (form.kind == DW_WriterFormKind_Address); } break;
case DW_AttribClass_Block: { is_enc_legal = (form.kind == DW_WriterFormKind_Block); } break;
case DW_AttribClass_Const: { is_enc_legal = (form.kind == DW_WriterFormKind_SInt || form.kind == DW_WriterFormKind_UInt); } break;
case DW_AttribClass_ExprLoc: { is_enc_legal = (form.kind == DW_WriterFormKind_ExprLoc); } break;
case DW_AttribClass_Flag: { is_enc_legal = (form.kind == DW_WriterFormKind_Flag); } break;
case DW_AttribClass_LinePtr: { is_enc_legal = (form.kind == DW_WriterFormKind_LinePtr); } break;
case DW_AttribClass_LocListPtr: { is_enc_legal = 0; /* TODO */ } break;
case DW_AttribClass_MacPtr: { is_enc_legal = (form.kind == DW_WriterFormKind_MacPtr); } break;
case DW_AttribClass_RngListPtr: { is_enc_legal = (form.kind == DW_WriterFormKind_RngListPtr); } break;
case DW_AttribClass_Reference: { is_enc_legal = (form.kind == DW_WriterFormKind_Ref); } break;
case DW_AttribClass_String: { is_enc_legal = (form.kind == DW_WriterFormKind_String); } break;
case DW_AttribClass_LocList: { is_enc_legal = 0; /* TODO */ } break;
case DW_AttribClass_RngList: { is_enc_legal = 0; /* TODO */ } break;
case DW_AttribClass_StrOffsetsPtr: { is_enc_legal = 0; /* TODO */ } break;
case DW_AttribClass_AddrPtr: { is_enc_legal = 0; /* TODO */ } break;
default: { InvalidPath; } break;
}
if (is_enc_legal) { break; }
}
Assert(is_enc_legal);
DW_WriterAttrib *attrib = dw_writer_attrib_chunk_list_push(writer->arena, &writer->attrib_chunk_list, 512);
attrib->kind = kind;
attrib->writer.form = form;