[apple/javascriptcore.git] / heap / HandleBlock.h

/*
 * 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 "HeapBlock.h"

namespace JSC {

class DeadBlock;
class HandleSet;
class HandleNode;

class HandleBlock : public HeapBlock<HandleBlock> {
public:
    static HandleBlock* create(DeadBlock*, HandleSet*);
    static HandleBlock* blockFor(HandleNode*);

    static const size_t blockSize = 4 * KB;

    HandleSet* handleSet();

    HandleNode* nodes();
    HandleNode* nodeAtIndex(unsigned);
    unsigned nodeCapacity();

private:
    HandleBlock(Region*, HandleSet*);

    char* payload();
    char* payloadEnd();

    static const size_t s_blockMask = ~(blockSize - 1);

    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
Commit	Line	Data
14957cd0	1	/*
93a37866	2	* Copyright (C) 2013 Apple Inc. All rights reserved.
14957cd0 A	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
93a37866 A	26	#ifndef HandleBlock_h
93a37866 A	27	#define HandleBlock_h
14957cd0	28
93a37866	29	#include "HeapBlock.h"
14957cd0 A	30
	31	namespace JSC {
	32
93a37866 A	33	class DeadBlock;
	34	class HandleSet;
	35	class HandleNode;
6fe7ccc8	36
93a37866 A	37	class HandleBlock : public HeapBlock<HandleBlock> {
	38	public:
	39	static HandleBlock* create(DeadBlock, HandleSet);
	40	static HandleBlock* blockFor(HandleNode*);
6fe7ccc8	41
93a37866 A	42	static const size_t blockSize = 4 * KB;
	43
	44	HandleSet* handleSet();
	45
	46	HandleNode* nodes();
	47	HandleNode* nodeAtIndex(unsigned);
	48	unsigned nodeCapacity();
	49
	50	private:
	51	HandleBlock(Region, HandleSet);
6fe7ccc8	52
93a37866 A	53	char* payload();
93a37866 A	54	char* payloadEnd();
6fe7ccc8	55
93a37866 A	56	static const size_t s_blockMask = ~(blockSize - 1);
	57
	58	HandleSet* m_handleSet;
	59	};
	60
	61	inline HandleBlock* HandleBlock::blockFor(HandleNode* node)
	62	{
	63	return reinterpret_cast<HandleBlock*>(reinterpret_cast<size_t>(node) & s_blockMask);
14957cd0 A	64	}
14957cd0 A	65
93a37866	66	inline HandleSet* HandleBlock::handleSet()
14957cd0	67	{
93a37866	68	return m_handleSet;
14957cd0 A	69	}
	70
	71	} // namespace JSC
93a37866 A	72
93a37866 A	73	#endif // HandleBlock_h