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https://github.com/darlinghq/darling-JavaScriptCore.git
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106 lines
4.6 KiB
C++
106 lines
4.6 KiB
C++
/*
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* Copyright (C) 2013, 2015 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "BytecodeBasicBlock.h"
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#include "BytecodeGraph.h"
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#include "CodeBlock.h"
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#include <wtf/Bitmap.h>
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#include <wtf/FastBitVector.h>
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namespace JSC {
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class BytecodeKills;
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class FullBytecodeLiveness;
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// We model our bytecode effects like the following and insert the liveness calculation points.
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//
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// <- BeforeUse
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// Use
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// <- AfterUse
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// Use by exception handlers
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// Def
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enum class LivenessCalculationPoint : uint8_t {
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BeforeUse,
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AfterUse,
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};
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class BytecodeLivenessPropagation {
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public:
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template<typename CodeBlockType, typename UseFunctor>
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static void stepOverBytecodeIndexUse(CodeBlockType*, const InstructionStream&, BytecodeGraph&, BytecodeIndex, const UseFunctor&);
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template<typename CodeBlockType, typename UseFunctor>
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static void stepOverBytecodeIndexUseInExceptionHandler(CodeBlockType*, const InstructionStream&, BytecodeGraph&, BytecodeIndex, const UseFunctor&);
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template<typename CodeBlockType, typename DefFunctor>
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static void stepOverBytecodeIndexDef(CodeBlockType*, const InstructionStream&, BytecodeGraph&, BytecodeIndex, const DefFunctor&);
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template<typename CodeBlockType, typename UseFunctor, typename DefFunctor>
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static void stepOverBytecodeIndex(CodeBlockType*, const InstructionStream&, BytecodeGraph&, BytecodeIndex, const UseFunctor&, const DefFunctor&);
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template<typename CodeBlockType>
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static void stepOverInstruction(CodeBlockType*, const InstructionStream&, BytecodeGraph&, BytecodeIndex, FastBitVector& out);
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template<typename CodeBlockType, typename Instructions>
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static bool computeLocalLivenessForInstruction(CodeBlockType*, const Instructions&, BytecodeGraph&, BytecodeBasicBlock&, BytecodeIndex, FastBitVector& result);
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template<typename CodeBlockType, typename Instructions>
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static bool computeLocalLivenessForBlock(CodeBlockType*, const Instructions&, BytecodeGraph&, BytecodeBasicBlock&);
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template<typename CodeBlockType, typename Instructions>
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static FastBitVector getLivenessInfoAtInstruction(CodeBlockType*, const Instructions&, BytecodeGraph&, BytecodeIndex);
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template<typename CodeBlockType, typename Instructions>
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static void runLivenessFixpoint(CodeBlockType*, const Instructions&, BytecodeGraph&);
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};
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class BytecodeLivenessAnalysis : private BytecodeLivenessPropagation {
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WTF_MAKE_FAST_ALLOCATED;
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WTF_MAKE_NONCOPYABLE(BytecodeLivenessAnalysis);
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public:
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friend class BytecodeLivenessPropagation;
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BytecodeLivenessAnalysis(CodeBlock*);
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FastBitVector getLivenessInfoAtInstruction(CodeBlock* codeBlock, BytecodeIndex bytecodeIndex) { return BytecodeLivenessPropagation::getLivenessInfoAtInstruction(codeBlock, codeBlock->instructions(), m_graph, bytecodeIndex); }
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void computeFullLiveness(CodeBlock*, FullBytecodeLiveness& result);
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BytecodeGraph& graph() { return m_graph; }
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private:
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void dumpResults(CodeBlock*);
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BytecodeGraph m_graph;
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};
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Bitmap<maxNumCheckpointTmps> tmpLivenessForCheckpoint(const CodeBlock&, BytecodeIndex);
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inline bool operandIsAlwaysLive(int operand);
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inline bool operandThatIsNotAlwaysLiveIsLive(const FastBitVector& out, int operand);
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inline bool operandIsLive(const FastBitVector& out, int operand);
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inline bool isValidRegisterForLiveness(int operand);
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} // namespace JSC
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