1/*
2 * Copyright (c) 2021-2022 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 "generatorFunctionBuilder.h"
17
18#include <compiler/core/pandagen.h>
19#include <compiler/base/catchTable.h>
20#include <ir/base/scriptFunction.h>
21
22namespace panda::es2panda::compiler {
23
24void GeneratorFunctionBuilder::Prepare(const ir::ScriptFunction *node)
25{
26    VReg callee = FunctionReg(node);
27    VReg completionType = pg_->AllocReg();
28    VReg completionValue = pg_->AllocReg();
29
30    pg_->CreateGeneratorObj(node, callee);
31    pg_->StoreAccumulator(node, funcObj_);
32    pg_->LoadConst(node, Constant::JS_UNDEFINED);
33    SuspendResumeExecution(node, completionType, completionValue);
34    HandleCompletion(node, completionType, completionValue);
35}
36
37void GeneratorFunctionBuilder::CleanUp(const ir::ScriptFunction *node) const
38{
39    const auto &labelSet = catchTable_->LabelSet();
40
41    pg_->SetLabel(node, labelSet.TryEnd());
42    pg_->SetLabel(node, labelSet.CatchBegin());
43    pg_->EmitThrow(node);
44    pg_->SetLabel(node, labelSet.CatchEnd());
45}
46
47void GeneratorFunctionBuilder::DirectReturn(const ir::AstNode *node) const
48{
49    pg_->EmitReturn(node);
50}
51
52void GeneratorFunctionBuilder::ImplicitReturn(const ir::AstNode *node) const
53{
54    pg_->SetSourceLocationFlag(lexer::SourceLocationFlag::INVALID_SOURCE_LOCATION);
55    pg_->LoadConst(node, Constant::JS_UNDEFINED);
56    pg_->SetSourceLocationFlag(lexer::SourceLocationFlag::VALID_SOURCE_LOCATION);
57    DirectReturn(node);
58}
59
60void GeneratorFunctionBuilder::ExplicitReturn(const ir::AstNode *node) const
61{
62    DirectReturn(node);
63}
64
65void GeneratorFunctionBuilder::Yield(const ir::AstNode *node)
66{
67    RegScope rs(pg_);
68    VReg value = pg_->AllocReg();
69    VReg done = pg_->AllocReg();
70    VReg completionType = pg_->AllocReg();
71    VReg completionValue = pg_->AllocReg();
72
73    pg_->StoreAccumulator(node, value);
74    pg_->LoadConst(node, Constant::JS_FALSE);
75    pg_->StoreAccumulator(node, done);
76    pg_->CreateIterResultObject(node, value, done);
77    SuspendResumeExecution(node, completionType, completionValue);
78
79    HandleCompletion(node, completionType, completionValue);
80}
81
82}  // namespace panda::es2panda::compiler
83