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/*
* Copyright (C) 2017 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, typename Enable = void>
class CagedUniquePtr : public CagedPtr<kind, T> {
public:
CagedUniquePtr(T* ptr = nullptr)
: CagedPtr<kind, T>(ptr)
{
}
CagedUniquePtr(CagedUniquePtr&& ptr)
: CagedPtr<kind, T>(ptr.m_ptr)
{
ptr.m_ptr = nullptr;
}
CagedUniquePtr(const CagedUniquePtr&) = delete;
template<typename... Arguments>
static CagedUniquePtr create(Arguments&&... arguments)
{
T* result = static_cast<T*>(Gigacage::malloc(kind, sizeof(T)));
new (result) T(std::forward<Arguments>(arguments)...);
return CagedUniquePtr(result);
}
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()
{
if (!this->m_ptr)
return;
this->m_ptr->~T();
Gigacage::free(kind, this->m_ptr);
}
};
template<Gigacage::Kind kind, typename T>
class CagedUniquePtr<kind, T[], typename std::enable_if<std::is_trivially_destructible<T>::value>::type> : public CagedPtr<kind, T> {
public:
CagedUniquePtr() : CagedPtr<kind, T>() { }
CagedUniquePtr(T* ptr)
: CagedPtr<kind, T>(ptr)
{
}
CagedUniquePtr(CagedUniquePtr&& ptr)
: CagedPtr<kind, T>(ptr.m_ptr)
{
ptr.m_ptr = nullptr;
}
CagedUniquePtr(const CagedUniquePtr&) = delete;
template<typename... Arguments>
static CagedUniquePtr create(size_t count, Arguments&&... arguments)
{
T* result = static_cast<T*>(Gigacage::mallocArray(kind, count, sizeof(T)));
while (count--)
new (result + count) T(std::forward<Arguments>(arguments)...);
return CagedUniquePtr(result);
}
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()
{
if (!this->m_ptr)
return;
Gigacage::free(kind, this->m_ptr);
}
};
template<Gigacage::Kind kind, typename T>
class CagedUniquePtr<kind, T[], typename std::enable_if<!std::is_trivially_destructible<T>::value>::type> : public CagedPtr<kind, T> {
public:
CagedUniquePtr() : CagedPtr<kind, T>() { }
CagedUniquePtr(T* ptr, size_t count)
: CagedPtr<kind, T>(ptr)
, m_count(count)
{
}
CagedUniquePtr(CagedUniquePtr&& ptr)
: CagedPtr<kind, T>(ptr.m_ptr)
, m_count(ptr.m_count)
{
ptr.clear();
}
CagedUniquePtr(const CagedUniquePtr&) = delete;
template<typename... Arguments>
static CagedUniquePtr create(size_t count, Arguments&&... arguments)
{
T* result = static_cast<T*>(Gigacage::mallocArray(kind, count, sizeof(T)));
while (count--)
new (result + count) T(std::forward<Arguments>(arguments)...);
return CagedUniquePtr(result, count);
}
CagedUniquePtr& operator=(CagedUniquePtr&& ptr)
{
destroy();
this->m_ptr = ptr.m_ptr;
m_count = ptr.m_count;
ptr.clear();
return *this;
}
CagedUniquePtr& operator=(const CagedUniquePtr&) = delete;
~CagedUniquePtr()
{
destroy();
}
// FIXME: It's weird that we inherit CagedPtr::operator== and friends, which don't do anything
// about m_count. It "works" because pointer equality is enough so long as everything is sane, but
// it seems like a missed opportunity to assert things.
// https://bugs.webkit.org/show_bug.cgi?id=175541
private:
void destroy()
{
if (!this->m_ptr)
return;
while (m_count--)
this->m_ptr[m_count].~T();
Gigacage::free(kind, this->m_ptr);
}
void clear()
{
this->m_ptr = nullptr;
m_count = 0;
}
size_t m_count { 0 };
};
} // namespace WTF
using WTF::CagedUniquePtr;