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/*
* Copyright (C) 2013 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.
*/
#ifndef HandleBlock_h
#define HandleBlock_h
#include <wtf/DoublyLinkedList.h>
namespace JSC {
class HandleSet;
class HandleNode;
class HandleBlock : public DoublyLinkedListNode<HandleBlock> {
friend class WTF::DoublyLinkedListNode<HandleBlock>;
public:
static HandleBlock* create(HandleSet*);
static void destroy(HandleBlock*);
static HandleBlock* blockFor(HandleNode*);
static const size_t blockSize = 4 * KB;
HandleSet* handleSet();
HandleNode* nodes();
HandleNode* nodeAtIndex(unsigned);
unsigned nodeCapacity();
private:
HandleBlock(HandleSet*);
char* payload();
char* payloadEnd();
static const size_t s_blockMask = ~(blockSize - 1);
HandleBlock* m_prev;
HandleBlock* m_next;
HandleSet* m_handleSet;
};
inline HandleBlock* HandleBlock::blockFor(HandleNode* node)
{
return reinterpret_cast<HandleBlock*>(reinterpret_cast<size_t>(node) & s_blockMask);
}
inline HandleSet* HandleBlock::handleSet()
{
return m_handleSet;
}
} // namespace JSC
#endif // HandleBlock_h
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