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"},
44 {"id", id_},
45 {"definite", AstDumper::Optional(definite_)},
46 {"init", AstDumper::Nullable(init_)}});
47 }
48
Compile(compiler::PandaGen *pg) const49 void VariableDeclarator::Compile(compiler::PandaGen *pg) const
50 {
51 const ir::VariableDeclaration *decl = parent_->AsVariableDeclaration();
52 if (decl->Declare()) {
53 return;
54 }
55
56 compiler::LReference lref = compiler::LReference::CreateLRef(pg, id_, true);
57
58 if (init_) {
59 init_->Compile(pg);
60 } else {
61 if (decl->Kind() == ir::VariableDeclaration::VariableDeclarationKind::VAR) {
62 return;
63 }
64 if (decl->Kind() == ir::VariableDeclaration::VariableDeclarationKind::LET && !decl->Parent()->IsCatchClause()) {
65 pg->LoadConst(this, compiler::Constant::JS_UNDEFINED);
66 }
67 }
68
69 lref.SetValue();
70 }
71
CheckSimpleVariableDeclaration(checker::Checker *checker, const ir::VariableDeclarator *declarator)72 static void CheckSimpleVariableDeclaration(checker::Checker *checker, const ir::VariableDeclarator *declarator)
73 {
74 CHECK_NOT_NULL(declarator);
75 binder::Variable *bindingVar = declarator->Id()->AsIdentifier()->Variable();
76 CHECK_NOT_NULL(bindingVar);
77 checker::Type *previousType = bindingVar->TsType();
78 const ir::Expression *typeAnnotation = declarator->Id()->AsIdentifier()->TypeAnnotation();
79 const ir::Expression *initializer = declarator->Init();
80 bool isConst = declarator->Parent()->AsVariableDeclaration()->Kind() ==
81 ir::VariableDeclaration::VariableDeclarationKind::CONST;
82
83 if (isConst) {
84 checker->AddStatus(checker::CheckerStatus::IN_CONST_CONTEXT);
85 }
86
87 if (typeAnnotation) {
88 typeAnnotation->Check(checker);
89 }
90
91 if (typeAnnotation && initializer) {
92 checker::Type *annotationType = typeAnnotation->AsTypeNode()->GetType(checker);
93 checker->ElaborateElementwise(annotationType, initializer, declarator->Id()->Start());
94 bindingVar->SetTsType(annotationType);
95 } else if (typeAnnotation) {
96 bindingVar->SetTsType(typeAnnotation->AsTypeNode()->GetType(checker));
97 } else if (initializer) {
98 checker::Type *initializerType = checker->CheckTypeCached(initializer);
99
100 if (!isConst) {
101 initializerType = checker->GetBaseTypeOfLiteralType(initializerType);
102 }
103
104 bindingVar->SetTsType(initializerType);
105 } else {
106 checker->ThrowTypeError({"Variable ", declarator->Id()->AsIdentifier()->Name(), " implicitly has an any type."},
107 declarator->Id()->Start());
108 }
109
110 if (previousType) {
111 checker->IsTypeIdenticalTo(bindingVar->TsType(), previousType,
112 {"Subsequent variable declaration must have the same type. Variable '",
113 bindingVar->Name(), "' must be of type '", previousType, "', but here has type '",
114 bindingVar->TsType(), "'."},
115 declarator->Id()->Start());
116 }
117
118 checker->RemoveStatus(checker::CheckerStatus::IN_CONST_CONTEXT);
119 }
120
Check(checker::Checker *checker) const121 checker::Type *VariableDeclarator::Check(checker::Checker *checker) const
122 {
123 auto found = checker->NodeCache().find(this);
124 if (found != checker->NodeCache().end()) {
125 return nullptr;
126 }
127
128 if (id_->IsIdentifier()) {
129 CheckSimpleVariableDeclaration(checker, this);
130 checker->NodeCache().insert({this, nullptr});
131 return nullptr;
132 }
133
134 if (id_->IsArrayPattern()) {
135 auto context = checker::SavedCheckerContext(checker, checker::CheckerStatus::FORCE_TUPLE);
136 checker::ArrayDestructuringContext(checker, id_, false, id_->AsArrayPattern()->TypeAnnotation() == nullptr,
137 id_->AsArrayPattern()->TypeAnnotation(), init_)
138 .Start();
139
140 checker->NodeCache().insert({this, nullptr});
141 return nullptr;
142 }
143
144 ASSERT(id_->IsObjectPattern());
145 auto context = checker::SavedCheckerContext(checker, checker::CheckerStatus::FORCE_TUPLE);
146 checker::ObjectDestructuringContext(checker, id_, false, id_->AsObjectPattern()->TypeAnnotation() == nullptr,
147 id_->AsObjectPattern()->TypeAnnotation(), init_)
148 .Start();
149
150 checker->NodeCache().insert({this, nullptr});
151 return nullptr;
152 }
153
UpdateSelf(const NodeUpdater &cb, [[maybe_unused]] binder::Binder *binder)154 void VariableDeclarator::UpdateSelf(const NodeUpdater &cb, [[maybe_unused]] binder::Binder *binder)
155 {
156 id_ = std::get<ir::AstNode *>(cb(id_))->AsExpression();
157
158 if (init_) {
159 init_ = std::get<ir::AstNode *>(cb(init_))->AsExpression();
160 }
161 }
162
163 } // namespace panda::es2panda::ir
164