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 "forInStatement.h"
17
18 #include <binder/binder.h>
19 #include <binder/scope.h>
20 #include <compiler/base/lreference.h>
21 #include <compiler/core/labelTarget.h>
22 #include <compiler/core/pandagen.h>
23 #include <typescript/checker.h>
24
25 #include <ir/astDump.h>
26 #include <ir/expression.h>
27
28 namespace panda::es2panda::ir {
29
Iterate(const NodeTraverser & cb) const30 void ForInStatement::Iterate(const NodeTraverser &cb) const
31 {
32 cb(left_);
33 cb(right_);
34 cb(body_);
35 }
36
Dump(ir::AstDumper * dumper) const37 void ForInStatement::Dump(ir::AstDumper *dumper) const
38 {
39 dumper->Add({{"type", "ForInStatement"}, {"left", left_}, {"right", right_}, {"body", body_}});
40 }
41
Compile(compiler::PandaGen * pg) const42 void ForInStatement::Compile(compiler::PandaGen *pg) const
43 {
44 if (scope_->NeedLexEnv()) {
45 pg->NewLexEnv(this, scope_->LexicalSlots());
46 }
47
48 compiler::LocalRegScope loopRegScope(pg, scope_);
49 compiler::VReg iter = pg->AllocReg();
50 compiler::VReg propName = pg->AllocReg();
51
52 // create enumerator
53 right_->Compile(pg);
54 pg->GetPropIterator(this);
55 pg->StoreAccumulator(this, iter);
56
57 if (scope_->NeedLexEnv()) {
58 pg->PopLexEnv(this);
59 }
60
61 compiler::LabelTarget labelTarget(pg);
62 // loop start
63 pg->SetLabel(this, labelTarget.ContinueTarget());
64
65 // get next prop of enumerator
66 pg->GetNextPropName(this, iter);
67 pg->StoreAccumulator(this, propName);
68 pg->BranchIfUndefined(this, labelTarget.BreakTarget());
69
70 auto lref = compiler::LReference::CreateLRef(pg, left_, false);
71 {
72 compiler::LoopEnvScope envScope(pg, scope_, labelTarget);
73 pg->LoadAccumulator(this, propName);
74 lref.SetValue();
75 body_->Compile(pg);
76 }
77
78 pg->Branch(this, labelTarget.ContinueTarget());
79 pg->SetLabel(this, labelTarget.BreakTarget());
80 }
81
Check(checker::Checker * checker) const82 checker::Type *ForInStatement::Check([[maybe_unused]] checker::Checker *checker) const
83 {
84 return nullptr;
85 }
86
UpdateSelf(const NodeUpdater & cb,binder::Binder * binder)87 void ForInStatement::UpdateSelf(const NodeUpdater &cb, binder::Binder *binder)
88 {
89 auto *loopScope = Scope();
90 auto loopCtx = binder::LexicalScope<binder::LoopScope>::Enter(binder, loopScope);
91 left_ = std::get<ir::AstNode *>(cb(left_));
92 right_ = std::get<ir::AstNode *>(cb(right_))->AsExpression();
93
94 body_ = std::get<ir::AstNode *>(cb(body_))->AsStatement();
95 }
96
97 } // namespace panda::es2panda::ir
98