xref: /arkcompiler/ets_frontend/es2panda/compiler/function/generatorFunctionBuilder.cpp

/*
 * Copyright (c) 2021-2022 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "generatorFunctionBuilder.h"

#include <compiler/core/pandagen.h>
#include <compiler/base/catchTable.h>
#include <ir/base/scriptFunction.h>

namespace panda::es2panda::compiler {

void GeneratorFunctionBuilder::Prepare(const ir::ScriptFunction *node)
{
    VReg callee = FunctionReg(node);
    VReg completionType = pg_->AllocReg();
    VReg completionValue = pg_->AllocReg();

    pg_->CreateGeneratorObj(node, callee);
    pg_->StoreAccumulator(node, funcObj_);
    pg_->LoadConst(node, Constant::JS_UNDEFINED);
    SuspendResumeExecution(node, completionType, completionValue);
    HandleCompletion(node, completionType, completionValue);
}

void GeneratorFunctionBuilder::CleanUp(const ir::ScriptFunction *node) const
{
    const auto &labelSet = catchTable_->LabelSet();

    pg_->SetLabel(node, labelSet.TryEnd());
    pg_->SetLabel(node, labelSet.CatchBegin());
    pg_->EmitThrow(node);
    pg_->SetLabel(node, labelSet.CatchEnd());
}

void GeneratorFunctionBuilder::DirectReturn(const ir::AstNode *node) const
{
    pg_->EmitReturn(node);
}

void GeneratorFunctionBuilder::ImplicitReturn(const ir::AstNode *node) const
{
    pg_->SetSourceLocationFlag(lexer::SourceLocationFlag::INVALID_SOURCE_LOCATION);
    pg_->LoadConst(node, Constant::JS_UNDEFINED);
    pg_->SetSourceLocationFlag(lexer::SourceLocationFlag::VALID_SOURCE_LOCATION);
    DirectReturn(node);
}

void GeneratorFunctionBuilder::ExplicitReturn(const ir::AstNode *node) const
{
    DirectReturn(node);
}

void GeneratorFunctionBuilder::Yield(const ir::AstNode *node)
{
    RegScope rs(pg_);
    VReg value = pg_->AllocReg();
    VReg done = pg_->AllocReg();
    VReg completionType = pg_->AllocReg();
    VReg completionValue = pg_->AllocReg();

    pg_->StoreAccumulator(node, value);
    pg_->LoadConst(node, Constant::JS_FALSE);
    pg_->StoreAccumulator(node, done);
    pg_->CreateIterResultObject(node, value, done);
    SuspendResumeExecution(node, completionType, completionValue);

    HandleCompletion(node, completionType, completionValue);
}

}  // namespace panda::es2panda::compiler