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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 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 "VirtualRegister.h"
	33
	34	#include <wtf/Assertions.h>
	35	#include <wtf/VectorTraits.h>
	36
	37	namespace JSC {
	38
	39	class RegisterID {
	40	WTF_MAKE_NONCOPYABLE(RegisterID);
	41	public:
	42	RegisterID()
	43	: m_refCount(0)
	44	, m_isTemporary(false)
	45	#ifndef NDEBUG
	46	, m_didSetIndex(false)
	47	#endif
	48	{
	49	}
	50
	51	RegisterID(VirtualRegister virtualRegister)
	52	: m_refCount(0)
	53	, m_virtualRegister(virtualRegister)
	54	, m_isTemporary(false)
	55	#ifndef NDEBUG
	56	, m_didSetIndex(true)
	57	#endif
	58	{
	59	}
	60
	61	explicit RegisterID(int index)
	62	: m_refCount(0)
	63	, m_virtualRegister(VirtualRegister(index))
	64	, m_isTemporary(false)
	65	#ifndef NDEBUG
	66	, m_didSetIndex(true)
	67	#endif
	68	{
	69	}
	70
	71	void setIndex(int index)
	72	{
	73	#ifndef NDEBUG
	74	m_didSetIndex = true;
	75	#endif
	76	m_virtualRegister = VirtualRegister(index);
	77	}
	78
	79	void setTemporary()
	80	{
	81	m_isTemporary = true;
	82	}
	83
	84	int index() const
	85	{
	86	ASSERT(m_didSetIndex);
	87	return m_virtualRegister.offset();
	88	}
	89
	90	VirtualRegister virtualRegister() const
	91	{
	92	ASSERT(m_virtualRegister.isValid());
	93	return m_virtualRegister;
	94	}
	95
	96	bool isTemporary()
	97	{
	98	return m_isTemporary;
	99	}
	100
	101	void ref()
	102	{
	103	++m_refCount;
	104	}
	105
	106	void deref()
	107	{
	108	--m_refCount;
	109	ASSERT(m_refCount >= 0);
	110	}
	111
	112	int refCount() const
	113	{
	114	return m_refCount;
	115	}
	116
	117	private:
	118
	119	int m_refCount;
	120	VirtualRegister m_virtualRegister;
	121	bool m_isTemporary;
	122	#ifndef NDEBUG
	123	bool m_didSetIndex;
	124	#endif
	125	};
	126
	127	} // namespace JSC
	128
	129	namespace WTF {
	130
	131	template<> struct VectorTraits<JSC::RegisterID> : VectorTraitsBase<true, JSC::RegisterID> {
	132	static const bool needsInitialization = true;
	133	static const bool canInitializeWithMemset = true; // Default initialization just sets everything to 0 or false, so this is safe.
	134	};
	135
	136	} // namespace WTF
	137
	138	#endif // RegisterID_h