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https://github.com/darlinghq/darling-JavaScriptCore.git
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67 lines
2.3 KiB
C++
67 lines
2.3 KiB
C++
/*
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* Copyright (C) 2016 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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namespace JSC {
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class JSCell;
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class VM;
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// An Auxiliary barrier is a barrier that does not try to reason about the value being stored into
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// it, other than interpreting a falsy value as not needing a barrier. It's OK to use this for either
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// JSCells or any other kind of data, so long as it responds to operator!().
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template<typename T>
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class AuxiliaryBarrier {
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public:
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typedef T Type;
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AuxiliaryBarrier(): m_value() { }
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template<typename U>
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AuxiliaryBarrier(VM&, JSCell*, U&&);
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void clear() { m_value = T(); }
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template<typename U>
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void set(VM&, JSCell*, U&&);
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const T& get() const { return m_value; }
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T* slot() { return &m_value; }
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explicit operator bool() const { return !!m_value; }
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template<typename U>
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void setWithoutBarrier(U&& value) { m_value = std::forward<U>(value); }
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T operator->() const { return get(); }
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private:
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T m_value;
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};
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} // namespace JSC
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