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/*
* Copyright (C) 2013, 2015 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.
*/
#pragma once
#include "BytecodeBasicBlock.h"
#include "BytecodeGraph.h"
#include "CodeBlock.h"
#include <wtf/FastBitVector.h>
#include <wtf/HashMap.h>
#include <wtf/Vector.h>
namespace JSC {
class BytecodeKills;
class FullBytecodeLiveness;
template<typename DerivedAnalysis>
class BytecodeLivenessPropagation {
protected:
template<typename Graph, typename UseFunctor, typename DefFunctor> void stepOverInstruction(Graph&, unsigned bytecodeOffset, FastBitVector& out, const UseFunctor&, const DefFunctor&);
template<typename Graph> void stepOverInstruction(Graph&, unsigned bytecodeOffset, FastBitVector& out);
template<typename Graph> bool computeLocalLivenessForBytecodeOffset(Graph&, BytecodeBasicBlock*, unsigned targetOffset, FastBitVector& result);
template<typename Graph> bool computeLocalLivenessForBlock(Graph&, BytecodeBasicBlock*);
template<typename Graph> FastBitVector getLivenessInfoAtBytecodeOffset(Graph&, unsigned bytecodeOffset);
template<typename Graph> void runLivenessFixpoint(Graph&);
};
class BytecodeLivenessAnalysis : private BytecodeLivenessPropagation<BytecodeLivenessAnalysis> {
WTF_MAKE_FAST_ALLOCATED;
WTF_MAKE_NONCOPYABLE(BytecodeLivenessAnalysis);
public:
friend class BytecodeLivenessPropagation<BytecodeLivenessAnalysis>;
BytecodeLivenessAnalysis(CodeBlock*);
bool operandIsLiveAtBytecodeOffset(int operand, unsigned bytecodeOffset);
FastBitVector getLivenessInfoAtBytecodeOffset(unsigned bytecodeOffset);
void computeFullLiveness(FullBytecodeLiveness& result);
void computeKills(BytecodeKills& result);
private:
void compute();
void dumpResults();
void getLivenessInfoAtBytecodeOffset(unsigned bytecodeOffset, FastBitVector&);
template<typename Functor> void computeDefsForBytecodeOffset(CodeBlock*, OpcodeID, Instruction*, FastBitVector&, const Functor&);
template<typename Functor> void computeUsesForBytecodeOffset(CodeBlock*, OpcodeID, Instruction*, FastBitVector&, const Functor&);
BytecodeGraph<CodeBlock> m_graph;
};
inline bool operandIsAlwaysLive(int operand);
inline bool operandThatIsNotAlwaysLiveIsLive(const FastBitVector& out, int operand);
inline bool operandIsLive(const FastBitVector& out, int operand);
inline bool isValidRegisterForLiveness(int operand);
} // namespace JSC
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