99 lines
3.2 KiB
C++
99 lines
3.2 KiB
C++
/*
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* Copyright (C) 2017-2020 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 <wtf/CagedPtr.h>
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namespace WTF {
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template<Gigacage::Kind kind, typename T, bool shouldTag = false>
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class CagedUniquePtr : public CagedPtr<kind, T, shouldTag> {
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static_assert(std::is_trivially_destructible<T>::value, "We expect the contents of a caged pointer to be trivially destructable.");
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public:
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using Base = CagedPtr<kind, T, shouldTag>;
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CagedUniquePtr() = default;
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CagedUniquePtr(T* ptr, size_t size)
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: Base(ptr, size)
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{ }
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CagedUniquePtr(CagedUniquePtr&& ptr)
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: Base(std::forward<CagedUniquePtr&&>(ptr))
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{ }
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CagedUniquePtr(const CagedUniquePtr&) = delete;
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template<typename... Arguments>
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static CagedUniquePtr create(size_t length, Arguments&&... arguments)
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{
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T* result = static_cast<T*>(Gigacage::malloc(kind, sizeof(T) * length));
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while (length--)
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new (result + length) T(arguments...);
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return CagedUniquePtr(result, length);
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}
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template<typename... Arguments>
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static CagedUniquePtr tryCreate(size_t length, Arguments&&... arguments)
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{
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T* result = static_cast<T*>(Gigacage::tryMalloc(kind, sizeof(T) * length));
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if (!result)
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return { };
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while (length--)
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new (result + length) T(arguments...);
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return CagedUniquePtr(result, length);
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}
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CagedUniquePtr& operator=(CagedUniquePtr&& ptr)
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{
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destroy();
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this->m_ptr = ptr.m_ptr;
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ptr.m_ptr = nullptr;
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return *this;
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}
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CagedUniquePtr& operator=(const CagedUniquePtr&) = delete;
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~CagedUniquePtr()
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{
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destroy();
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}
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private:
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void destroy()
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{
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T* ptr = Base::getUnsafe();
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if (!ptr)
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return;
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ptr->~T();
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Gigacage::free(kind, ptr);
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}
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};
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} // namespace WTF
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using WTF::CagedUniquePtr;
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