[apple/javascriptcore.git] / bytecode / FullBytecodeLiveness.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 FullBytecodeLiveness_h
#define FullBytecodeLiveness_h

#include <wtf/FastBitVector.h>

namespace JSC {

class BytecodeLivenessAnalysis;

typedef HashMap<unsigned, FastBitVector, WTF::IntHash<unsigned>, WTF::UnsignedWithZeroKeyHashTraits<unsigned>> BytecodeToBitmapMap;

class FullBytecodeLiveness {
public:
    FullBytecodeLiveness() : m_codeBlock(0) { }
    
    // We say "out" to refer to the bitvector that contains raw results for a bytecode
    // instruction.
    const FastBitVector& getOut(unsigned bytecodeIndex) const
    {
        BytecodeToBitmapMap::const_iterator iter = m_map.find(bytecodeIndex);
        ASSERT(iter != m_map.end());
        return iter->value;
    }
    
    bool operandIsLive(int operand, unsigned bytecodeIndex) const
    {
        return operandIsAlwaysLive(m_codeBlock, operand) || operandThatIsNotAlwaysLiveIsLive(m_codeBlock, getOut(bytecodeIndex), operand);
    }
    
    FastBitVector getLiveness(unsigned bytecodeIndex) const
    {
        return getLivenessInfo(m_codeBlock, getOut(bytecodeIndex));
    }
    
private:
    friend class BytecodeLivenessAnalysis;
    
    CodeBlock* m_codeBlock;
    BytecodeToBitmapMap m_map;
};

} // namespace JSC

#endif // FullBytecodeLiveness_h
Commit	Line	Data
14957cd0	1	/*
81345200	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
81345200 A	26	#ifndef FullBytecodeLiveness_h
81345200 A	27	#define FullBytecodeLiveness_h
14957cd0	28
81345200	29	#include <wtf/FastBitVector.h>
14957cd0	30
81345200 A	31	namespace JSC {
	32
	33	class BytecodeLivenessAnalysis;
	34
	35	typedef HashMap<unsigned, FastBitVector, WTF::IntHash<unsigned>, WTF::UnsignedWithZeroKeyHashTraits<unsigned>> BytecodeToBitmapMap;
	36
	37	class FullBytecodeLiveness {
	38	public:
	39	FullBytecodeLiveness() : m_codeBlock(0) { }
	40
	41	// We say "out" to refer to the bitvector that contains raw results for a bytecode
	42	// instruction.
	43	const FastBitVector& getOut(unsigned bytecodeIndex) const
	44	{
	45	BytecodeToBitmapMap::const_iterator iter = m_map.find(bytecodeIndex);
	46	ASSERT(iter != m_map.end());
	47	return iter->value;
	48	}
	49
	50	bool operandIsLive(int operand, unsigned bytecodeIndex) const
	51	{
	52	return operandIsAlwaysLive(m_codeBlock, operand) \|\| operandThatIsNotAlwaysLiveIsLive(m_codeBlock, getOut(bytecodeIndex), operand);
	53	}
	54
	55	FastBitVector getLiveness(unsigned bytecodeIndex) const
	56	{
	57	return getLivenessInfo(m_codeBlock, getOut(bytecodeIndex));
	58	}
	59
	60	private:
	61	friend class BytecodeLivenessAnalysis;
	62
	63	CodeBlock* m_codeBlock;
	64	BytecodeToBitmapMap m_map;
	65	};
	66
	67	} // namespace JSC
	68
	69	#endif // FullBytecodeLiveness_h
14957cd0	70