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/*
* 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
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