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/catchTable.h>
21#include <compiler/base/iterators.h>
22#include <compiler/base/lreference.h>
23#include <compiler/core/labelTarget.h>
24#include <compiler/core/pandagen.h>
25#include <typescript/checker.h>
26#include <ir/astDump.h>
27#include <ir/expression.h>
28
29namespace panda::es2panda::ir {
30
31void ForOfStatement::Iterate(const NodeTraverser &cb) const
32{
33    cb(left_);
34    cb(right_);
35    cb(body_);
36}
37
38void ForOfStatement::Dump(ir::AstDumper *dumper) const
39{
40    dumper->Add({{"type", "ForOfStatement"}, {"await", isAwait_}, {"left", left_}, {"right", right_}, {"body", body_}});
41}
42
43void ForOfStatement::Compile(compiler::PandaGen *pg) const
44{
45    compiler::LocalRegScope regScope(pg, scope_);
46
47    if (scope_->NeedLexEnv()) {
48        pg->NewLexEnv(this, scope_->LexicalSlots());
49    }
50
51    {
52        compiler::TryContext iterInitTryCtx(pg);
53        const auto &labelSet = iterInitTryCtx.LabelSet();
54        pg->SetLabel(right_, labelSet.TryBegin());
55        right_->Compile(pg);
56        pg->SetLabel(right_, labelSet.TryEnd());
57        pg->Branch(right_, labelSet.CatchEnd());
58
59        pg->SetLabel(right_, labelSet.CatchBegin());
60        compiler::VReg exception = pg->AllocReg();
61        pg->StoreAccumulator(right_, exception);
62        if (scope_->NeedLexEnv()) {
63            pg->PopLexEnv(this);
64        }
65        pg->LoadAccumulator(right_, exception);
66        pg->EmitThrow(right_);
67        pg->SetLabel(right_, labelSet.CatchEnd());
68    }
69
70    if (scope_->NeedLexEnv()) {
71        pg->PopLexEnv(this);
72    }
73
74    compiler::LabelTarget labelTarget(pg);
75    auto iterator_type = isAwait_ ? compiler::IteratorType::ASYNC : compiler::IteratorType::SYNC;
76    compiler::Iterator iterator(pg, this, iterator_type);
77
78    pg->SetLabel(this, labelTarget.ContinueTarget());
79
80    iterator.Next();
81    iterator.Complete();
82    pg->BranchIfTrue(this, labelTarget.BreakTarget());
83
84    compiler::VReg value = pg->AllocReg();
85    iterator.Value();
86    pg->StoreAccumulator(this, value);
87
88    auto lref = compiler::LReference::CreateLRef(pg, left_, false);
89    {
90        compiler::IteratorContext forOfCtx(pg, iterator, labelTarget);
91        compiler::LoopEnvScope envScope(pg, scope_, {});
92        pg->LoadAccumulator(this, value);
93        lref.SetValue();
94
95        body_->Compile(pg);
96    }
97
98    pg->Branch(this, labelTarget.ContinueTarget());
99    pg->SetLabel(this, labelTarget.BreakTarget());
100}
101
102checker::Type *ForOfStatement::Check([[maybe_unused]] checker::Checker *checker) const
103{
104    return nullptr;
105}
106
107void ForOfStatement::UpdateSelf(const NodeUpdater &cb, binder::Binder *binder)
108{
109    auto *loopScope = Scope();
110    auto loopCtx = binder::LexicalScope<binder::LoopScope>::Enter(binder, loopScope);
111    left_ = std::get<ir::AstNode *>(cb(left_));
112    right_ = std::get<ir::AstNode *>(cb(right_))->AsExpression();
113
114    body_ = UpdateChildStatement(cb, binder, body_);
115}
116
117}  // namespace panda::es2panda::ir
118