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add implicit cast from enum to union

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when the enum is the tag type of the union and is comptime known
to be of a void field of the union

See #642
This commit is contained in:
Andrew Kelley
2017-12-05 20:46:58 -05:00
parent 63a2f9a8b2
commit 960914a073
5 changed files with 129 additions and 8 deletions
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5
src/codegen.cpp
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@@ -3946,8 +3946,6 @@ static LLVMValueRef gen_const_val(CodeGen *g, ConstExprValue *const_val) {
case TypeTableEntryIdUnion:
{
LLVMTypeRef union_type_ref = type_entry->data.unionation.union_type_ref;
ConstExprValue *payload_value = const_val->data.x_union.payload;
assert(payload_value != nullptr);
if (type_entry->data.unionation.gen_field_count == 0) {
if (type_entry->data.unionation.gen_tag_index == SIZE_MAX) {
@@ -3960,7 +3958,8 @@ static LLVMValueRef gen_const_val(CodeGen *g, ConstExprValue *const_val) {
LLVMValueRef union_value_ref;
bool make_unnamed_struct;
if (!type_has_bits(payload_value->type)) {
ConstExprValue *payload_value = const_val->data.x_union.payload;
if (payload_value == nullptr || !type_has_bits(payload_value->type)) {
if (type_entry->data.unionation.gen_tag_index == SIZE_MAX)
return LLVMGetUndef(type_entry->type_ref);