1 /*
2 * Copyright (c) 2022 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "optionalChain.h"
17
18 #include <compiler/core/pandagen.h>
19
20 namespace panda::es2panda::compiler {
OptionalChain(PandaGen * pg,const ir::AstNode * node)21 OptionalChain::OptionalChain(PandaGen *pg, const ir::AstNode *node) : pg_(pg), node_(node), prev_(pg->optionalChain_)
22 {
23 pg_->optionalChain_ = this;
24 }
25
~OptionalChain()26 OptionalChain::~OptionalChain()
27 {
28 if (label_) {
29 pg_->SetLabel(node_, label_);
30 }
31 pg_->optionalChain_ = prev_;
32 }
33
CheckNullish(bool optional,compiler::VReg obj)34 void OptionalChain::CheckNullish(bool optional, compiler::VReg obj)
35 {
36 if (!optional) {
37 return;
38 }
39
40 if (!label_) {
41 label_ = pg_->AllocLabel();
42 }
43
44 RegScope rs(pg_);
45
46 auto *notNullish = pg_->AllocLabel();
47 auto *nullish = pg_->AllocLabel();
48
49 pg_->LoadConst(node_, Constant::JS_NULL);
50 pg_->Condition(node_, lexer::TokenType::PUNCTUATOR_NOT_STRICT_EQUAL, obj, nullish);
51 pg_->LoadConst(node_, Constant::JS_UNDEFINED);
52 pg_->Condition(node_, lexer::TokenType::PUNCTUATOR_NOT_STRICT_EQUAL, obj, nullish);
53 pg_->Branch(node_, notNullish);
54 pg_->SetLabel(node_, nullish);
55
56 pg_->LoadConst(node_, compiler::Constant::JS_UNDEFINED);
57 pg_->Branch(node_, label_);
58 pg_->SetLabel(node_, notNullish);
59 pg_->LoadAccumulator(node_, obj);
60 }
61
62 } // namespace panda::es2panda::compiler
63