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 "switchBuilder.h"
17
18#include <ir/expression.h>
19#include <ir/statements/switchStatement.h>
20#include <ir/statements/switchCaseStatement.h>
21#include <compiler/core/pandagen.h>
22#include <compiler/core/labelTarget.h>
23#include <typescript/checker.h>
24
25namespace panda::es2panda::compiler {
26// SwitchBuilder
27
28SwitchBuilder::SwitchBuilder(PandaGen *pg, const ir::SwitchStatement *stmt)
29    : pg_(pg), end_(pg->AllocLabel()), labelCtx_(pg, LabelTarget(end_, LabelTarget::BREAK_LABEL)), stmt_(stmt)
30{
31    for (size_t i = 0; i < stmt_->Cases().size(); i++) {
32        caseLabels_.push_back(pg_->AllocLabel());
33    }
34}
35
36SwitchBuilder::~SwitchBuilder()
37{
38    pg_->SetLabel(stmt_, end_);
39}
40
41void SwitchBuilder::SetCaseTarget(uint32_t index)
42{
43    pg_->SetLabel(stmt_->Cases()[index], caseLabels_[index]);
44}
45
46void SwitchBuilder::CompileTagOfSwitch(VReg tag)
47{
48    stmt_->Discriminant()->Compile(pg_);
49    pg_->StoreAccumulator(stmt_->Discriminant(), tag);
50}
51
52void SwitchBuilder::CompileCaseStatements(uint32_t index)
53{
54    for (const auto *stmt : stmt_->Cases()[index]->Consequent()) {
55        stmt->Compile(pg_);
56    }
57}
58
59void SwitchBuilder::JumpIfCase(VReg tag, uint32_t index)
60{
61    const ir::SwitchCaseStatement *caseTarget = stmt_->Cases()[index];
62    caseTarget->Test()->Compile(pg_);
63    pg_->Condition(caseTarget, lexer::TokenType::PUNCTUATOR_NOT_STRICT_EQUAL, tag, caseLabels_[index]);
64}
65
66void SwitchBuilder::JumpToDefault(uint32_t defaultIndex)
67{
68    const ir::SwitchCaseStatement *defaultTarget = stmt_->Cases()[defaultIndex];
69    pg_->Branch(defaultTarget, caseLabels_[defaultIndex]);
70}
71
72void SwitchBuilder::Break()
73{
74    pg_->Branch(stmt_, end_);
75}
76}  // namespace panda::es2panda::compiler
77