mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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98 lines
3.3 KiB
C++
98 lines
3.3 KiB
C++
/*
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* Copyright (C) 2017 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "AuxiliaryBarrier.h"
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#include <wtf/CagedPtr.h>
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namespace JSC {
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class JSCell;
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class VM;
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// This is a convenient combo of AuxiliaryBarrier and CagedPtr.
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template<Gigacage::Kind passedKind, typename T, bool shouldTag = false>
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class CagedBarrierPtr {
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public:
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static constexpr Gigacage::Kind kind = passedKind;
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using Type = T;
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using CagedType = CagedPtr<kind, Type, shouldTag>;
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CagedBarrierPtr() = default;
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template<typename U>
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CagedBarrierPtr(VM& vm, JSCell* cell, U&& value, unsigned size)
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{
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m_barrier.set(vm, cell, CagedType(std::forward<U>(value), size));
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}
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void clear() { m_barrier.clear(); }
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template<typename U>
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void set(VM& vm, JSCell* cell, U&& value, unsigned size)
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{
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m_barrier.set(vm, cell, CagedType(std::forward<U>(value), size));
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}
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T* get(unsigned size) const { return m_barrier.get().get(size); }
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T* getMayBeNull(unsigned size) const { return m_barrier.get().getMayBeNull(size); }
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T* getUnsafe() const { return m_barrier.get().getUnsafe(); }
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// We need the template here so that the type of U is deduced at usage time rather than class time. U should always be T.
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template<typename U = T>
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typename std::enable_if<!std::is_same<void, U>::value, T>::type&
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/* T& */ at(unsigned index, unsigned size) const { return get(size)[index]; }
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bool operator==(const CagedBarrierPtr& other) const
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{
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return m_barrier.get() == other.m_barrier.get();
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}
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bool operator!=(const CagedBarrierPtr& other) const
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{
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return !(*this == other);
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}
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explicit operator bool() const
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{
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return !!m_barrier.get();
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}
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template<typename U>
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void setWithoutBarrier(U&& value, unsigned size) { m_barrier.setWithoutBarrier(CagedType(std::forward<U>(value), size)); }
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T* rawBits() const
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{
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return m_barrier.get().rawBits();
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}
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private:
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AuxiliaryBarrier<CagedType> m_barrier;
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};
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} // namespace JSC
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