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/*
* Copyright (C) 2017-2020 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <wtf/CagedPtr.h>
namespace WTF {
template<Gigacage::Kind kind, typename T>
class CagedUniquePtr : public CagedPtr<kind, T> {
static_assert(std::is_trivially_destructible<T>::value, "We expect the contents of a caged pointer to be trivially destructable.");
public:
using Base = CagedPtr<kind, T>;
CagedUniquePtr() = default;
CagedUniquePtr(T* ptr)
: Base(ptr)
{ }
CagedUniquePtr(CagedUniquePtr&& ptr)
: Base(std::forward<CagedUniquePtr&&>(ptr))
{ }
CagedUniquePtr(const CagedUniquePtr&) = delete;
template<typename... Arguments>
static CagedUniquePtr create(size_t length, Arguments&&... arguments)
{
T* result = static_cast<T*>(Gigacage::malloc(kind, sizeof(T) * length));
while (length--)
new (result + length) T(arguments...);
return CagedUniquePtr(result);
}
template<typename... Arguments>
static CagedUniquePtr tryCreate(size_t length, Arguments&&... arguments)
{
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
T* result = static_cast<T*>(Gigacage::tryMalloc(kind, sizeof(T) * length));
if (!result)
return { };
while (length--)
new (result + length) T(arguments...);
return CagedUniquePtr(result);
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
}
CagedUniquePtr& operator=(CagedUniquePtr&& ptr)
{
destroy();
this->m_ptr = ptr.m_ptr;
ptr.m_ptr = nullptr;
return *this;
}
CagedUniquePtr& operator=(const CagedUniquePtr&) = delete;
~CagedUniquePtr()
{
destroy();
}
private:
void destroy()
{
T* ptr = Base::getUnsafe();
if (!ptr)
return;
ptr->~T();
Gigacage::free(kind, ptr);
}
};
} // namespace WTF
using WTF::CagedUniquePtr;
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