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/*
* Copyright (C) 2011 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. ``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
* 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.
*/
#ifndef HeapBlock_h
#define HeapBlock_h
#include <wtf/DoublyLinkedList.h>
#include <wtf/PageAllocationAligned.h>
#include <wtf/StdLibExtras.h>
namespace JSC {
enum AllocationEffort { AllocationCanFail, AllocationMustSucceed };
#if COMPILER(GCC)
#define CLASS_IF_GCC class
#else
#define CLASS_IF_GCC
#endif
template<typename T>
class HeapBlock : public DoublyLinkedListNode<T> {
friend CLASS_IF_GCC DoublyLinkedListNode<T>;
public:
static const size_t s_blockSize = 64 * KB;
static PageAllocationAligned destroy(HeapBlock* block)
{
static_cast<T*>(block)->~T();
PageAllocationAligned allocation;
std::swap(allocation, block->m_allocation);
return allocation;
}
HeapBlock(const PageAllocationAligned& allocation)
: DoublyLinkedListNode<T>()
, m_allocation(allocation)
, m_prev(0)
, m_next(0)
{
ASSERT(m_allocation);
}
const PageAllocationAligned allocation() const { return m_allocation; }
private:
PageAllocationAligned m_allocation;
T* m_prev;
T* m_next;
};
} // namespace JSC
#endif
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