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support the %return expression

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This commit is contained in:
Andrew Kelley 2016-01-24 20:13:08 -07:00
parent f5cc7f65a3
commit 29a83f648b
1 changed files with 23 additions and 6 deletions
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29
src/codegen.cpp
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@ -1266,17 +1266,34 @@ static LLVMValueRef gen_return_expr(CodeGen *g, AstNode *node) {
assert(value_type->id == TypeTableEntryIdErrorUnion);
TypeTableEntry *child_type = value_type->data.error.child_type;
LLVMBasicBlockRef return_block = LLVMAppendBasicBlock(g->cur_fn->fn_value, "ErrReturnYes");
LLVMBasicBlockRef continue_block = LLVMAppendBasicBlock(g->cur_fn->fn_value, "ErrReturnNo");
LLVMBasicBlockRef return_block = LLVMAppendBasicBlock(g->cur_fn->fn_value, "ErrRetReturn");
LLVMBasicBlockRef continue_block = LLVMAppendBasicBlock(g->cur_fn->fn_value, "ErrRetContinue");
add_debug_source_node(g, node);
LLVMValueRef err_val;
if (child_type->size_in_bits > 0) {
LLVMValueRef err_val_ptr = LLVMBuildStructGEP(g->builder, value, 0, "");
err_val = LLVMBuildLoad(g->builder, err_val_ptr, "");
} else {
err_val = value;
}
LLVMValueRef zero = LLVMConstNull(g->err_tag_type->type_ref);
LLVMValueRef cond_val = LLVMBuildICmp(g->builder, LLVMIntEQ, err_val, zero, "");
LLVMBuildCondBr(g->builder, cond_val, continue_block, return_block);
LLVMPositionBuilderAtEnd(g->builder, return_block);
if (child_type->size_in_bits > 0) {
zig_panic("TODO write the error tag value to sret");
TypeTableEntry *return_type = g->cur_fn->type_entry->data.fn.src_return_type;
if (return_type->id == TypeTableEntryIdPureError) {
gen_return(g, node, err_val);
} else if (return_type->id == TypeTableEntryIdErrorUnion) {
assert(g->cur_ret_ptr);
add_debug_source_node(g, node);
LLVMValueRef tag_ptr = LLVMBuildStructGEP(g->builder, g->cur_ret_ptr, 0, "");
LLVMBuildStore(g->builder, err_val, tag_ptr);
LLVMBuildRetVoid(g->builder);
} else {
add_debug_source_node(g, node);
LLVMBuildRet(g->builder, value);
zig_unreachable();
}
LLVMPositionBuilderAtEnd(g->builder, continue_block);