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 "variableDeclarator.h"
17
18 #include <compiler/base/lreference.h>
19 #include <compiler/core/pandagen.h>
20 #include <ir/astDump.h>
21 #include <ir/expression.h>
22 #include <ir/typeNode.h>
23 #include <ir/statements/variableDeclaration.h>
24 #include <ir/expressions/arrayExpression.h>
25 #include <ir/expressions/identifier.h>
26 #include <ir/expressions/objectExpression.h>
27 #include <typescript/checker.h>
28 #include <typescript/core/destructuringContext.h>
29
30 namespace panda::es2panda::ir {
31
Iterate(const NodeTraverser & cb) const32 void VariableDeclarator::Iterate(const NodeTraverser &cb) const
33 {
34 cb(id_);
35
36 if (init_) {
37 cb(init_);
38 }
39 }
40
Dump(ir::AstDumper * dumper) const41 void VariableDeclarator::Dump(ir::AstDumper *dumper) const
42 {
43 dumper->Add({{"type", "VariableDeclarator"}, {"id", id_}, {"init", AstDumper::Nullable(init_)}});
44 }
45
Compile(compiler::PandaGen * pg) const46 void VariableDeclarator::Compile(compiler::PandaGen *pg) const
47 {
48 compiler::LReference lref = compiler::LReference::CreateLRef(pg, id_, true);
49 const ir::VariableDeclaration *decl = parent_->AsVariableDeclaration();
50
51 if (init_) {
52 init_->Compile(pg);
53 } else {
54 if (decl->Kind() == ir::VariableDeclaration::VariableDeclarationKind::VAR) {
55 return;
56 }
57 if (decl->Kind() == ir::VariableDeclaration::VariableDeclarationKind::LET && !decl->Parent()->IsCatchClause()) {
58 pg->LoadConst(this, compiler::Constant::JS_UNDEFINED);
59 }
60 }
61
62 lref.SetValue();
63 }
64
CheckSimpleVariableDeclaration(checker::Checker * checker,const ir::VariableDeclarator * declarator)65 static void CheckSimpleVariableDeclaration(checker::Checker *checker, const ir::VariableDeclarator *declarator)
66 {
67 binder::Variable *bindingVar = declarator->Id()->AsIdentifier()->Variable();
68 checker::Type *previousType = bindingVar->TsType();
69 const ir::Expression *typeAnnotation = declarator->Id()->AsIdentifier()->TypeAnnotation();
70 const ir::Expression *initializer = declarator->Init();
71 bool isConst = declarator->Parent()->AsVariableDeclaration()->Kind() ==
72 ir::VariableDeclaration::VariableDeclarationKind::CONST;
73
74 if (isConst) {
75 checker->AddStatus(checker::CheckerStatus::IN_CONST_CONTEXT);
76 }
77
78 if (typeAnnotation) {
79 typeAnnotation->Check(checker);
80 }
81
82 if (typeAnnotation && initializer) {
83 checker::Type *annotationType = typeAnnotation->AsTypeNode()->GetType(checker);
84 checker->ElaborateElementwise(annotationType, initializer, declarator->Id()->Start());
85 bindingVar->SetTsType(annotationType);
86 } else if (typeAnnotation) {
87 bindingVar->SetTsType(typeAnnotation->AsTypeNode()->GetType(checker));
88 } else if (initializer) {
89 checker::Type *initializerType = checker->CheckTypeCached(initializer);
90
91 if (!isConst) {
92 initializerType = checker->GetBaseTypeOfLiteralType(initializerType);
93 }
94
95 bindingVar->SetTsType(initializerType);
96 } else {
97 checker->ThrowTypeError({"Variable ", declarator->Id()->AsIdentifier()->Name(), " implicitly has an any type."},
98 declarator->Id()->Start());
99 }
100
101 if (previousType) {
102 checker->IsTypeIdenticalTo(bindingVar->TsType(), previousType,
103 {"Subsequent variable declaration must have the same type. Variable '",
104 bindingVar->Name(), "' must be of type '", previousType, "', but here has type '",
105 bindingVar->TsType(), "'."},
106 declarator->Id()->Start());
107 }
108
109 checker->RemoveStatus(checker::CheckerStatus::IN_CONST_CONTEXT);
110 }
111
Check(checker::Checker * checker) const112 checker::Type *VariableDeclarator::Check(checker::Checker *checker) const
113 {
114 auto found = checker->NodeCache().find(this);
115
116 if (found != checker->NodeCache().end()) {
117 return nullptr;
118 }
119
120 if (id_->IsIdentifier()) {
121 CheckSimpleVariableDeclaration(checker, this);
122 checker->NodeCache().insert({this, nullptr});
123 return nullptr;
124 }
125
126 if (id_->IsArrayPattern()) {
127 auto context = checker::SavedCheckerContext(checker, checker::CheckerStatus::FORCE_TUPLE);
128 checker::ArrayDestructuringContext(checker, id_, false, id_->AsArrayPattern()->TypeAnnotation() == nullptr,
129 id_->AsArrayPattern()->TypeAnnotation(), init_)
130 .Start();
131
132 checker->NodeCache().insert({this, nullptr});
133 return nullptr;
134 }
135
136 ASSERT(id_->IsObjectPattern());
137 auto context = checker::SavedCheckerContext(checker, checker::CheckerStatus::FORCE_TUPLE);
138 checker::ObjectDestructuringContext(checker, id_, false, id_->AsObjectPattern()->TypeAnnotation() == nullptr,
139 id_->AsObjectPattern()->TypeAnnotation(), init_)
140 .Start();
141
142 checker->NodeCache().insert({this, nullptr});
143 return nullptr;
144 }
145
UpdateSelf(const NodeUpdater & cb,binder::Binder * binder)146 void VariableDeclarator::UpdateSelf(const NodeUpdater &cb, [[maybe_unused]] binder::Binder *binder)
147 {
148 id_ = std::get<ir::AstNode *>(cb(id_))->AsExpression();
149
150 if (init_) {
151 init_ = std::get<ir::AstNode *>(cb(init_))->AsExpression();
152 }
153 }
154
155 } // namespace panda::es2panda::ir
156