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Commit	Line	Data
	1	/*
	2	* Copyright (C) 2013 Apple Inc. All rights reserved.
	3	*
	4	* Redistribution and use in source and binary forms, with or without
	5	* modification, are permitted provided that the following conditions
	6	* are met:
	7	* 1. Redistributions of source code must retain the above copyright
	8	* notice, this list of conditions and the following disclaimer.
	9	* 2. Redistributions in binary form must reproduce the above copyright
	10	* notice, this list of conditions and the following disclaimer in the
	11	* documentation and/or other materials provided with the distribution.
	12	*
	13	* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
	14	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
	15	* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	16	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
	17	* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	18	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	19	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	20	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	21	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	22	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
	23	* THE POSSIBILITY OF SUCH DAMAGE.
	24	*/
	25
	26	#ifndef HandleBlock_h
	27	#define HandleBlock_h
	28
	29	#include <wtf/DoublyLinkedList.h>
	30
	31	namespace JSC {
	32
	33	class DeadBlock;
	34	class HandleSet;
	35	class HandleNode;
	36
	37	class HandleBlock : public DoublyLinkedListNode<HandleBlock> {
	38	friend class WTF::DoublyLinkedListNode<HandleBlock>;
	39	public:
	40	static HandleBlock* create(HandleSet*);
	41	static void destroy(HandleBlock*);
	42	static HandleBlock* blockFor(HandleNode*);
	43
	44	static const size_t blockSize = 4 * KB;
	45
	46	HandleSet* handleSet();
	47
	48	HandleNode* nodes();
	49	HandleNode* nodeAtIndex(unsigned);
	50	unsigned nodeCapacity();
	51
	52	private:
	53	HandleBlock(HandleSet*);
	54
	55	char* payload();
	56	char* payloadEnd();
	57
	58	static const size_t s_blockMask = ~(blockSize - 1);
	59
	60	HandleBlock* m_prev;
	61	HandleBlock* m_next;
	62	HandleSet* m_handleSet;
	63	};
	64
	65	inline HandleBlock* HandleBlock::blockFor(HandleNode* node)
	66	{
	67	return reinterpret_cast<HandleBlock*>(reinterpret_cast<size_t>(node) & s_blockMask);
	68	}
	69
	70	inline HandleSet* HandleBlock::handleSet()
	71	{
	72	return m_handleSet;
	73	}
	74
	75	} // namespace JSC
	76
	77	#endif // HandleBlock_h