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Commit	Line	Data
	1	/*
	2	* Copyright (C) 2008 Apple Inc. All rights reserved.
	3	* Copyright (C) 2008 Cameron Zwarich <cwzwarich@uwaterloo.ca>
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	*
	9	* 1. Redistributions of source code must retain the above copyright
	10	* notice, this list of conditions and the following disclaimer.
	11	* 2. Redistributions in binary form must reproduce the above copyright
	12	* notice, this list of conditions and the following disclaimer in the
	13	* documentation and/or other materials provided with the distribution.
	14	* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
	15	* its contributors may be used to endorse or promote products derived
	16	* from this software without specific prior written permission.
	17	*
	18	* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
	19	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
	20	* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	21	* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
	22	* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
	23	* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	24	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
	25	* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	26	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	27	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	28	*/
	29
	30	#ifndef JumpTable_h
	31	#define JumpTable_h
	32
	33	#include "UString.h"
	34	#include <wtf/HashMap.h>
	35	#include <wtf/Vector.h>
	36
	37	namespace JSC {
	38
	39	struct OffsetLocation {
	40	int32_t branchOffset;
	41	#if ENABLE(JIT)
	42	void* ctiOffset;
	43	#endif
	44	};
	45
	46	struct StringJumpTable {
	47	typedef HashMap<RefPtr<UString::Rep>, OffsetLocation> StringOffsetTable;
	48	StringOffsetTable offsetTable;
	49	#if ENABLE(JIT)
	50	void* ctiDefault; // FIXME: it should not be necessary to store this.
	51	#endif
	52
	53	inline int32_t offsetForValue(UString::Rep* value, int32_t defaultOffset)
	54	{
	55	StringOffsetTable::const_iterator end = offsetTable.end();
	56	StringOffsetTable::const_iterator loc = offsetTable.find(value);
	57	if (loc == end)
	58	return defaultOffset;
	59	return loc->second.branchOffset;
	60	}
	61
	62	#if ENABLE(JIT)
	63	inline void* ctiForValue(UString::Rep* value)
	64	{
	65	StringOffsetTable::const_iterator end = offsetTable.end();
	66	StringOffsetTable::const_iterator loc = offsetTable.find(value);
	67	if (loc == end)
	68	return ctiDefault;
	69	return loc->second.ctiOffset;
	70	}
	71	#endif
	72	};
	73
	74	struct SimpleJumpTable {
	75	// FIXME: The two Vectors can be combind into one Vector<OffsetLocation>
	76	Vector<int32_t> branchOffsets;
	77	int32_t min;
	78	#if ENABLE(JIT)
	79	Vector<void*> ctiOffsets;
	80	void* ctiDefault;
	81	#endif
	82
	83	int32_t offsetForValue(int32_t value, int32_t defaultOffset);
	84	void add(int32_t key, int32_t offset)
	85	{
	86	if (!branchOffsets[key])
	87	branchOffsets[key] = offset;
	88	}
	89
	90	#if ENABLE(JIT)
	91	inline void* ctiForValue(int32_t value)
	92	{
	93	if (value >= min && static_cast<uint32_t>(value - min) < ctiOffsets.size())
	94	return ctiOffsets[value - min];
	95	return ctiDefault;
	96	}
	97	#endif
	98	};
	99
	100	} // namespace JSC
	101
	102	#endif // JumpTable_h