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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 Label_h
	30	#define Label_h
	31
	32	#include "CodeBlock.h"
	33	#include "Instruction.h"
	34	#include <wtf/Assertions.h>
	35	#include <wtf/Vector.h>
	36	#include <limits.h>
	37
	38	namespace JSC {
	39
	40	class Label {
	41	public:
	42	explicit Label(BytecodeGenerator* generator)
	43	: m_refCount(0)
	44	, m_location(invalidLocation)
	45	, m_generator(generator)
	46	{
	47	}
	48
	49	void setLocation(unsigned);
	50
	51	int bind(int opcode, int offset) const
	52	{
	53	if (m_location == invalidLocation) {
	54	m_unresolvedJumps.append(std::make_pair(opcode, offset));
	55	return 0;
	56	}
	57	return m_location - opcode;
	58	}
	59
	60	void ref() { ++m_refCount; }
	61	void deref()
	62	{
	63	--m_refCount;
	64	ASSERT(m_refCount >= 0);
	65	}
	66	int refCount() const { return m_refCount; }
	67
	68	bool isForward() const { return m_location == invalidLocation; }
	69
	70	private:
	71	typedef Vector<std::pair<int, int>, 8> JumpVector;
	72
	73	static const unsigned invalidLocation = UINT_MAX;
	74
	75	int m_refCount;
	76	unsigned m_location;
	77	BytecodeGenerator* m_generator;
	78	mutable JumpVector m_unresolvedJumps;
	79	};
	80
	81	} // namespace JSC
	82
	83	#endif // Label_h