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implement constant initialization of enum values

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see #5
This commit is contained in:
Andrew Kelley
2016-04-19 17:15:36 -07:00
parent 9658c05fd4
commit 4e37fb2fa2
3 changed files with 83 additions and 9 deletions
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18
src/codegen.cpp
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@@ -2937,7 +2937,23 @@ static LLVMValueRef gen_const_val(CodeGen *g, TypeTableEntry *type_entry, ConstE
assert(enum_field->value == const_val->data.x_enum.tag);
LLVMValueRef union_value;
if (type_has_bits(enum_field->type_entry)) {
union_value = gen_const_val(g, union_type, const_val->data.x_enum.payload);
uint64_t union_type_bytes = LLVMStoreSizeOfType(g->target_data_ref,
union_type->type_ref);
uint64_t field_type_bytes = LLVMStoreSizeOfType(g->target_data_ref,
enum_field->type_entry->type_ref);
uint64_t pad_bytes = union_type_bytes - field_type_bytes;
LLVMValueRef correctly_typed_value = gen_const_val(g, enum_field->type_entry,
const_val->data.x_enum.payload);
if (pad_bytes == 0) {
union_value = correctly_typed_value;
} else {
LLVMValueRef fields[] = {
correctly_typed_value,
LLVMGetUndef(LLVMArrayType(LLVMInt8Type(), pad_bytes)),
};
union_value = LLVMConstStruct(fields, 2, false);
}
} else {
union_value = LLVMGetUndef(union_type->type_ref);
}