mirror of
https://github.com/quizhizhe/LiteLoaderBDS-1.16.40.git
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88 lines
2.1 KiB
C++
88 lines
2.1 KiB
C++
/*
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* Tencent is pleased to support the open source community by making ScriptX available.
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* Copyright (C) 2021 THL A29 Limited, a Tencent company. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include "../WasmHelper.h"
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namespace script {
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namespace wasm_backend {
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class WasmEngineScope {
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int stackTop_;
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public:
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explicit WasmEngineScope(WasmEngine &, WasmEngine *);
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~WasmEngineScope() {
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// restore stack top
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wasm_backend::Stack::setTop(stackTop_);
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}
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};
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class WasmExitEngineScope {
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public:
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explicit WasmExitEngineScope(WasmEngine &) {
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// exit current entered engine
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}
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~WasmExitEngineScope() {
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// reenter engine;
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}
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};
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class WasmStackFrameScope {
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int stackTop_;
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bool hasReturnValue_ = false;
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public:
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explicit WasmStackFrameScope(WasmEngine &) : stackTop_(wasm_backend::Stack::top()) {
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// reserved for return value
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wasm_backend::Stack::pushNull();
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}
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~WasmStackFrameScope() {
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if (hasReturnValue_) {
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// preserve ths return value
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wasm_backend::Stack::setTop(stackTop_ + 1);
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} else {
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wasm_backend::Stack::setTop(stackTop_);
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}
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}
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template <typename T>
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Local<T> returnValue(const Local<T> &localRef);
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};
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} // namespace wasm_backend
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template <>
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struct internal::ImplType<EngineScope> {
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using type = wasm_backend::WasmEngineScope;
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};
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template <>
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struct internal::ImplType<ExitEngineScope> {
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using type = wasm_backend::WasmExitEngineScope;
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};
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template <>
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struct internal::ImplType<StackFrameScope> {
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using type = wasm_backend::WasmStackFrameScope;
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};
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} // namespace script
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