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Commit	Line	Data
	1	/*
	2	* Copyright (C) 2008 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	*
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
	14	* its contributors may be used to endorse or promote products derived
	15	* from this software without specific prior written permission.
	16	*
	17	* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
	18	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
	19	* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	20	* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
	21	* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
	22	* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	23	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
	24	* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	27	*/
	28
	29	#ifndef RegisterID_h
	30	#define RegisterID_h
	31
	32	#include <wtf/Assertions.h>
	33	#include <wtf/Noncopyable.h>
	34	#include <wtf/VectorTraits.h>
	35
	36	namespace JSC {
	37
	38	class RegisterID : public Noncopyable {
	39	public:
	40	RegisterID()
	41	: m_refCount(0)
	42	, m_isTemporary(false)
	43	#ifndef NDEBUG
	44	, m_didSetIndex(false)
	45	#endif
	46	{
	47	}
	48
	49	explicit RegisterID(int index)
	50	: m_refCount(0)
	51	, m_index(index)
	52	, m_isTemporary(false)
	53	#ifndef NDEBUG
	54	, m_didSetIndex(true)
	55	#endif
	56	{
	57	}
	58
	59	void setIndex(int index)
	60	{
	61	ASSERT(!m_refCount);
	62	#ifndef NDEBUG
	63	m_didSetIndex = true;
	64	#endif
	65	m_index = index;
	66	}
	67
	68	void setTemporary()
	69	{
	70	m_isTemporary = true;
	71	}
	72
	73	int index() const
	74	{
	75	ASSERT(m_didSetIndex);
	76	return m_index;
	77	}
	78
	79	bool isTemporary()
	80	{
	81	return m_isTemporary;
	82	}
	83
	84	void ref()
	85	{
	86	++m_refCount;
	87	}
	88
	89	void deref()
	90	{
	91	--m_refCount;
	92	ASSERT(m_refCount >= 0);
	93	}
	94
	95	int refCount() const
	96	{
	97	return m_refCount;
	98	}
	99
	100	private:
	101
	102	int m_refCount;
	103	int m_index;
	104	bool m_isTemporary;
	105	#ifndef NDEBUG
	106	bool m_didSetIndex;
	107	#endif
	108	};
	109
	110	} // namespace JSC
	111
	112	namespace WTF {
	113
	114	template<> struct VectorTraits<JSC::RegisterID> : VectorTraitsBase<true, JSC::RegisterID> {
	115	static const bool needsInitialization = true;
	116	static const bool canInitializeWithMemset = true; // Default initialization just sets everything to 0 or false, so this is safe.
	117	};
	118
	119	} // namespace WTF
	120
	121	#endif // RegisterID_h