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 "returnStatement.h"
17
18 #include <ir/base/methodDefinition.h>
19 #include <ir/base/scriptFunction.h>
20 #include <compiler/core/pandagen.h>
21 #include <typescript/checker.h>
22
23 #include <ir/astDump.h>
24 #include <ir/expression.h>
25 #include <ir/typeNode.h>
26
27 namespace panda::es2panda::ir {
28
Iterate(const NodeTraverser &cb) const29 void ReturnStatement::Iterate(const NodeTraverser &cb) const
30 {
31 if (argument_) {
32 cb(argument_);
33 }
34 }
35
Dump(ir::AstDumper *dumper) const36 void ReturnStatement::Dump(ir::AstDumper *dumper) const
37 {
38 dumper->Add({{"type", "ReturnStatement"}, {"argument", AstDumper::Nullable(argument_)}});
39 }
40
Compile(compiler::PandaGen *pg) const41 void ReturnStatement::Compile(compiler::PandaGen *pg) const
42 {
43 if (argument_) {
44 argument_->Compile(pg);
45 } else {
46 pg->LoadConst(this, compiler::Constant::JS_UNDEFINED);
47 }
48
49 if (pg->CheckControlFlowChange()) {
50 compiler::RegScope rs(pg);
51 compiler::VReg res = pg->AllocReg();
52
53 pg->StoreAccumulator(this, res);
54 pg->ControlFlowChangeReturn();
55 pg->LoadAccumulator(this, res);
56 }
57
58 if (argument_) {
59 pg->ValidateClassDirectReturn(this);
60 pg->ExplicitReturn(this);
61 } else {
62 pg->ImplicitReturn(this);
63 }
64 }
65
Check(checker::Checker *checker) const66 checker::Type *ReturnStatement::Check(checker::Checker *checker) const
67 {
68 const ir::AstNode *ancestor = checker::Checker::FindAncestorGivenByType(this, ir::AstNodeType::SCRIPT_FUNCTION);
69 CHECK_NOT_NULL(ancestor);
70 ASSERT(ancestor && ancestor->IsScriptFunction());
71 const ir::ScriptFunction *containingFunc = ancestor->AsScriptFunction();
72
73 if (containingFunc->Parent()->Parent()->IsMethodDefinition()) {
74 const ir::MethodDefinition *containingClassMethod = containingFunc->Parent()->Parent()->AsMethodDefinition();
75 if (containingClassMethod->Kind() == ir::MethodDefinitionKind::SET) {
76 checker->ThrowTypeError("Setters cannot return a value", Start());
77 }
78 }
79
80 if (containingFunc->ReturnTypeAnnotation()) {
81 checker::Type *returnType = checker->GlobalUndefinedType();
82 checker::Type *funcReturnType = containingFunc->ReturnTypeAnnotation()->AsTypeNode()->GetType(checker);
83
84 if (argument_) {
85 checker->ElaborateElementwise(funcReturnType, argument_, Start());
86 returnType = checker->CheckTypeCached(argument_);
87 }
88
89 checker->IsTypeAssignableTo(returnType, funcReturnType,
90 {"Type '", returnType, "' is not assignable to type '", funcReturnType, "'."},
91 Start());
92 }
93
94 return nullptr;
95 }
96
UpdateSelf(const NodeUpdater &cb, [[maybe_unused]] binder::Binder *binder)97 void ReturnStatement::UpdateSelf(const NodeUpdater &cb, [[maybe_unused]] binder::Binder *binder)
98 {
99 if (argument_) {
100 argument_ = std::get<ir::AstNode *>(cb(argument_))->AsExpression();
101 }
102 }
103
104 } // namespace panda::es2panda::ir
105