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Fix llvm_const_cast with constant union literals

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gingerBill
2026-06-29 11:41:27 +01:00
parent feb9b6159e
commit 2f3174fe10
2 changed files with 73 additions and 9 deletions
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68
src/llvm_backend_const.cpp
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@@ -99,23 +99,69 @@ gb_internal LLVMValueRef llvm_const_cast(lbModule *m, LLVMValueRef val, LLVMType
return LLVMConstNull(dst);
}
GB_ASSERT_MSG(lb_sizeof(dst) == lb_sizeof(src), "%s vs %s", LLVMPrintTypeToString(dst), LLVMPrintTypeToString(src));
LLVMTypeKind kind = LLVMGetTypeKind(dst);
switch (kind) {
case LLVMPointerTypeKind: {
GB_ASSERT_MSG(lb_sizeof(dst) == lb_sizeof(src), "dst:%s vs src:%s (dst:%lld vs src:%lld)", LLVMPrintTypeToString(dst), LLVMPrintTypeToString(src),
cast(long long)lb_sizeof(dst),
cast(long long)lb_sizeof(src));
return LLVMConstPointerCast(val, dst);
}
case LLVMStructTypeKind: {
GB_ASSERT_MSG(lb_sizeof(dst) == lb_sizeof(src), "dst:%s vs src:%s (dst:%lld vs src:%lld)", LLVMPrintTypeToString(dst), LLVMPrintTypeToString(src),
cast(long long)lb_sizeof(dst),
cast(long long)lb_sizeof(src));
unsigned src_n = LLVMCountStructElementTypes(src);
unsigned dst_n = LLVMCountStructElementTypes(dst);
if (src_n != dst_n) goto failure;
bool skip_cast = true;
for (unsigned i = 0; i < dst_n; i++) {
LLVMTypeKind dt = LLVMGetTypeKind(LLVMStructGetTypeAtIndex(dst, i));
LLVMTypeKind st = LLVMGetTypeKind(LLVMStructGetTypeAtIndex(src, i));
if (dt != st) {
skip_cast = false;
}
if (dt == LLVMIntegerTypeKind) {
continue;
}
if (dt != LLVMArrayTypeKind) {
skip_cast = false;
break;
}
LLVMValueRef field_val = llvm_const_extract_value(m, val, i);
if (field_val == nullptr) goto failure;
LLVMTypeRef dst_elem_ty = LLVMStructGetTypeAtIndex(dst, i);
LLVMTypeRef src_elem_ty = LLVMTypeOf(field_val);
if (lb_sizeof(dst_elem_ty) > lb_sizeof(src_elem_ty)) {
skip_cast = true;
continue;
}
}
if (skip_cast) {
return val;
}
LLVMValueRef *field_vals = temporary_alloc_array<LLVMValueRef>(dst_n);
for (unsigned i = 0; i < dst_n; i++) {
LLVMValueRef field_val = llvm_const_extract_value(m, val, i);
if (field_val == nullptr) goto failure;
LLVMTypeRef dst_elem_ty = LLVMStructGetTypeAtIndex(dst, i);
LLVMTypeRef src_elem_ty = LLVMTypeOf(field_val);
GB_ASSERT_MSG(lb_sizeof(dst_elem_ty) == lb_sizeof(src_elem_ty), "dst:%s vs src:%s (dst:%lld vs src:%lld) to %s from %s", LLVMPrintTypeToString(dst_elem_ty), LLVMPrintTypeToString(src_elem_ty),
cast(long long)lb_sizeof(dst_elem_ty),
cast(long long)lb_sizeof(src_elem_ty),
LLVMPrintTypeToString(dst),
LLVMPrintTypeToString(src)
);
field_vals[i] = llvm_const_cast(m, field_val, dst_elem_ty, failure_);
if (failure_ && *failure_) goto failure;
}
@@ -126,6 +172,9 @@ gb_internal LLVMValueRef llvm_const_cast(lbModule *m, LLVMValueRef val, LLVMType
return LLVMConstStructInContext(m->ctx, field_vals, dst_n, LLVMIsPackedStruct(dst));
}
}
case LLVMArrayTypeKind: {
goto failure;
}
}
failure:
@@ -946,21 +995,26 @@ gb_internal lbValue lb_const_value(lbModule *m, Type *type, ExactValue value, Ty
res.type = original_type;
return res;
} else {
LLVMValueRef values[4] = {};
isize value_count = 0;
// Payload
values[value_count++] = cv.value;
unsigned tag_value = 1;
if (bt->Union.kind == UnionType_no_nil) {
tag_value = 0;
}
LLVMValueRef tag = LLVMConstInt(LLVMStructGetTypeAtIndex(llvm_type, 1), tag_value, false);
LLVMValueRef padding = nullptr;
isize value_count = 2;
// Tag
values[value_count++] = LLVMConstInt(LLVMStructGetTypeAtIndex(llvm_type, 1), tag_value, false);;
if (LLVMCountStructElementTypes(llvm_type) > 2) {
value_count = 3;
padding = LLVMConstNull(LLVMStructGetTypeAtIndex(llvm_type, 2));
GB_ASSERT(LLVMCountStructElementTypes(llvm_type) == 3);
// Padding
values[value_count++] = LLVMConstNull(LLVMStructGetTypeAtIndex(llvm_type, 2));
}
LLVMValueRef values[3] = {cv.value, tag, padding};
res.value = llvm_const_named_struct_internal(m, llvm_type, values, value_count);
res.type = original_type;
return res;