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 <binder/binder.h>
19 #include <binder/scope.h>
20 #include <compiler/base/iterators.h>
21 #include <compiler/base/lreference.h>
22 #include <compiler/core/labelTarget.h>
23 #include <compiler/core/pandagen.h>
24 #include <typescript/checker.h>
25 #include <ir/astDump.h>
26 #include <ir/expression.h>
27
28 namespace panda::es2panda::ir {
29
Iterate(const NodeTraverser & cb) const30 void ForOfStatement::Iterate(const NodeTraverser &cb) const
31 {
32 cb(left_);
33 cb(right_);
34 cb(body_);
35 }
36
Dump(ir::AstDumper * dumper) const37 void ForOfStatement::Dump(ir::AstDumper *dumper) const
38 {
39 dumper->Add({{"type", "ForOfStatement"}, {"await", isAwait_}, {"left", left_}, {"right", right_}, {"body", body_}});
40 }
41
Compile(compiler::PandaGen * pg) const42 void ForOfStatement::Compile(compiler::PandaGen *pg) const
43 {
44 compiler::LocalRegScope regScope(pg, scope_);
45
46 if (scope_->NeedLexEnv()) {
47 pg->NewLexEnv(this, scope_->LexicalSlots());
48 }
49
50 right_->Compile(pg); // if poplexenv next, acc will not be affected, no need to store the value to a vreg
51
52 if (scope_->NeedLexEnv()) {
53 pg->PopLexEnv(this);
54 }
55
56 compiler::LabelTarget labelTarget(pg);
57 auto iterator_type = isAwait_ ? compiler::IteratorType::ASYNC : compiler::IteratorType::SYNC;
58 compiler::Iterator iterator(pg, this, iterator_type);
59
60 pg->SetLabel(this, labelTarget.ContinueTarget());
61
62 iterator.Next();
63 iterator.Complete();
64 pg->BranchIfTrue(this, labelTarget.BreakTarget());
65
66 compiler::VReg value = pg->AllocReg();
67 iterator.Value();
68 pg->StoreAccumulator(this, value);
69
70 auto lref = compiler::LReference::CreateLRef(pg, left_, false);
71 {
72 compiler::IteratorContext forOfCtx(pg, iterator, labelTarget);
73 compiler::LoopEnvScope envScope(pg, scope_, {});
74 pg->LoadAccumulator(this, value);
75 lref.SetValue();
76
77 body_->Compile(pg);
78 }
79
80 pg->Branch(this, labelTarget.ContinueTarget());
81 pg->SetLabel(this, labelTarget.BreakTarget());
82 }
83
Check(checker::Checker * checker) const84 checker::Type *ForOfStatement::Check([[maybe_unused]] checker::Checker *checker) const
85 {
86 return nullptr;
87 }
88
UpdateSelf(const NodeUpdater & cb,binder::Binder * binder)89 void ForOfStatement::UpdateSelf(const NodeUpdater &cb, binder::Binder *binder)
90 {
91 auto *loopScope = Scope();
92 auto loopCtx = binder::LexicalScope<binder::LoopScope>::Enter(binder, loopScope);
93 left_ = std::get<ir::AstNode *>(cb(left_));
94 right_ = std::get<ir::AstNode *>(cb(right_))->AsExpression();
95
96 body_ = std::get<ir::AstNode *>(cb(body_))->AsStatement();
97 }
98
99 } // namespace panda::es2panda::ir
100