1 /**
2 * Copyright (c) 2021 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 "forOfStatement.h"
17
18 #include <compiler/base/catchTable.h>
19 #include <compiler/base/lreference.h>
20 #include <compiler/core/pandagen.h>
21 #include <ir/astDump.h>
22
23 namespace panda::es2panda::ir {
24
Iterate(const NodeTraverser & cb) const25 void ForOfStatement::Iterate(const NodeTraverser &cb) const
26 {
27 cb(left_);
28 cb(right_);
29 cb(body_);
30 }
31
Dump(ir::AstDumper * dumper) const32 void ForOfStatement::Dump(ir::AstDumper *dumper) const
33 {
34 dumper->Add({{"type", "ForOfStatement"}, {"await", isAwait_}, {"left", left_}, {"right", right_}, {"body", body_}});
35 }
36
Compile(compiler::PandaGen * pg) const37 void ForOfStatement::Compile(compiler::PandaGen *pg) const
38 {
39 compiler::LocalRegScope regScope(pg, scope_);
40
41 if (scope_->NeedLexEnv()) {
42 pg->NewLexEnv(this, scope_->LexicalSlots());
43 }
44
45 {
46 compiler::TryContext iterInitTryCtx(pg);
47 const auto &labelSet = iterInitTryCtx.LabelSet();
48 pg->SetLabel(right_, labelSet.TryBegin());
49 right_->Compile(pg);
50 pg->SetLabel(right_, labelSet.TryEnd());
51 pg->Branch(right_, labelSet.CatchEnd());
52
53 pg->SetLabel(right_, labelSet.CatchBegin());
54 compiler::VReg exception = pg->AllocReg();
55 pg->StoreAccumulator(right_, exception);
56 if (scope_->NeedLexEnv()) {
57 pg->PopLexEnv(this);
58 }
59 pg->LoadAccumulator(right_, exception);
60 pg->EmitThrow(right_);
61 pg->SetLabel(right_, labelSet.CatchEnd());
62 }
63
64 if (scope_->NeedLexEnv()) {
65 pg->PopLexEnv(this);
66 }
67
68 compiler::LabelTarget labelTarget(pg);
69 auto iterator_type = isAwait_ ? compiler::IteratorType::ASYNC : compiler::IteratorType::SYNC;
70 compiler::Iterator iterator(pg, this, iterator_type);
71
72 pg->SetLabel(this, labelTarget.ContinueTarget());
73
74 iterator.Next();
75 iterator.Complete();
76 pg->BranchIfTrue(this, labelTarget.BreakTarget());
77
78 compiler::VReg value = pg->AllocReg();
79 iterator.Value();
80 pg->StoreAccumulator(this, value);
81
82 auto lref = compiler::LReference::CreateLRef(pg, left_, false);
83 {
84 compiler::IteratorContext forOfCtx(pg, iterator, labelTarget);
85 compiler::LoopEnvScope envScope(pg, scope_, {});
86 pg->LoadAccumulator(this, value);
87 lref.SetValue();
88
89 body_->Compile(pg);
90 }
91
92 pg->Branch(this, labelTarget.ContinueTarget());
93 pg->SetLabel(this, labelTarget.BreakTarget());
94 }
95
Check(checker::Checker * checker) const96 checker::Type *ForOfStatement::Check([[maybe_unused]] checker::Checker *checker) const
97 {
98 return nullptr;
99 }
100
UpdateSelf(const NodeUpdater & cb,binder::Binder * binder)101 void ForOfStatement::UpdateSelf(const NodeUpdater &cb, binder::Binder *binder)
102 {
103 auto *loopScope = Scope();
104 auto loopCtx = binder::LexicalScope<binder::LoopScope>::Enter(binder, loopScope);
105 left_ = std::get<ir::AstNode *>(cb(left_));
106 right_ = std::get<ir::AstNode *>(cb(right_))->AsExpression();
107
108 body_ = UpdateChildStatement(cb, binder, body_);
109 }
110
111 } // namespace panda::es2panda::ir
112