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 "switchStatement.h"
17
18 #include <binder/binder.h>
19 #include <binder/scope.h>
20 #include <compiler/core/labelTarget.h>
21 #include <compiler/core/switchBuilder.h>
22 #include <compiler/core/pandagen.h>
23 #include <typescript/checker.h>
24 #include <ir/astDump.h>
25 #include <ir/expression.h>
26 #include <ir/statements/switchCaseStatement.h>
27
28 namespace panda::es2panda::ir {
29
Iterate(const NodeTraverser & cb) const30 void SwitchStatement::Iterate(const NodeTraverser &cb) const
31 {
32 cb(discriminant_);
33
34 for (auto *it : cases_) {
35 cb(it);
36 }
37 }
38
Dump(ir::AstDumper * dumper) const39 void SwitchStatement::Dump(ir::AstDumper *dumper) const
40 {
41 dumper->Add({{"type", "SwitchStatement"}, {"discriminant", discriminant_}, {"cases", cases_}});
42 }
43
Compile(compiler::PandaGen * pg) const44 void SwitchStatement::Compile(compiler::PandaGen *pg) const
45 {
46 compiler::SwitchBuilder builder(pg, this);
47 compiler::VReg tag = pg->AllocReg();
48
49 builder.CompileTagOfSwitch(tag);
50
51 compiler::LocalRegScope lrs(pg, scope_);
52 uint32_t defaultIndex = 0;
53
54 if (cases_.size() == 0) {
55 return;
56 }
57
58 for (size_t i = 0; i < cases_.size(); i++) {
59 const auto *clause = cases_[i];
60
61 if (!clause->Test()) {
62 defaultIndex = i;
63 continue;
64 }
65
66 builder.JumpIfCase(tag, i);
67 }
68
69 if (!cases_[defaultIndex]->Test()) {
70 builder.JumpToDefault(defaultIndex);
71 } else {
72 builder.Break();
73 }
74
75 for (size_t i = 0; i < cases_.size(); i++) {
76 builder.SetCaseTarget(i);
77 builder.CompileCaseStatements(i);
78 }
79 }
80
Check(checker::Checker * checker) const81 checker::Type *SwitchStatement::Check(checker::Checker *checker) const
82 {
83 checker::ScopeContext scopeCtx(checker, scope_);
84
85 checker::Type *exprType = discriminant_->Check(checker);
86 bool exprIsLiteral = checker::Checker::IsLiteralType(exprType);
87
88 for (auto *it : cases_) {
89 if (it->Test()) {
90 checker::Type *caseType = it->Test()->Check(checker);
91 bool caseIsLiteral = checker::Checker::IsLiteralType(caseType);
92 checker::Type *comparedExprType = exprType;
93
94 if (!caseIsLiteral || !exprIsLiteral) {
95 caseType = caseIsLiteral ? checker->GetBaseTypeOfLiteralType(caseType) : caseType;
96 comparedExprType = checker->GetBaseTypeOfLiteralType(exprType);
97 }
98
99 if (!checker->IsTypeEqualityComparableTo(comparedExprType, caseType) &&
100 !checker->IsTypeComparableTo(caseType, comparedExprType)) {
101 checker->ThrowTypeError({"Type ", caseType, " is not comparable to type ", comparedExprType},
102 it->Test()->Start());
103 }
104 }
105
106 for (auto *caseStmt : it->Consequent()) {
107 caseStmt->Check(checker);
108 }
109 }
110
111 return nullptr;
112 }
113
UpdateSelf(const NodeUpdater & cb,binder::Binder * binder)114 void SwitchStatement::UpdateSelf(const NodeUpdater &cb, binder::Binder *binder)
115 {
116 auto scopeCtx = binder::LexicalScope<binder::LocalScope>::Enter(binder, scope_);
117
118 discriminant_ = std::get<ir::AstNode *>(cb(discriminant_))->AsExpression();
119
120 for (auto iter = cases_.begin(); iter != cases_.end(); iter++) {
121 *iter = std::get<ir::AstNode *>(cb(*iter))->AsSwitchCaseStatement();
122 }
123 }
124
125 } // namespace panda::es2panda::ir
126