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
28namespace panda::es2panda::ir {
29
30void SwitchStatement::Iterate(const NodeTraverser &cb) const
31{
32    cb(discriminant_);
33
34    for (auto *it : cases_) {
35        cb(it);
36    }
37}
38
39void SwitchStatement::Dump(ir::AstDumper *dumper) const
40{
41    dumper->Add({{"type", "SwitchStatement"}, {"discriminant", discriminant_}, {"cases", cases_}});
42}
43
44void 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
81checker::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
114void 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