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https://github.com/darlinghq/darling-JavaScriptCore.git
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72 lines
3.0 KiB
C++
72 lines
3.0 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 "BytecodeLivenessAnalysis.h"
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#include "Operands.h"
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#include <wtf/FastBitVector.h>
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namespace JSC {
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class BytecodeLivenessAnalysis;
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class CodeBlock;
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// Note: Full bytecode liveness does not track any information about the liveness of temps.
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// If you want tmp liveness for a checkpoint ask tmpLivenessForCheckpoint.
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class FullBytecodeLiveness {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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const FastBitVector& getLiveness(BytecodeIndex bytecodeIndex, LivenessCalculationPoint point) const
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{
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// We don't have to worry about overflowing into the next bytecodeoffset in our vectors because we
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// static assert that bytecode length is greater than the number of checkpoints in BytecodeStructs.h
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switch (point) {
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case LivenessCalculationPoint::BeforeUse:
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return m_usesBefore[toIndex(bytecodeIndex)];
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case LivenessCalculationPoint::AfterUse:
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return m_usesAfter[toIndex(bytecodeIndex)];
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}
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RELEASE_ASSERT_NOT_REACHED();
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}
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bool virtualRegisterIsLive(VirtualRegister reg, BytecodeIndex bytecodeIndex, LivenessCalculationPoint point) const
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{
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return virtualRegisterIsAlwaysLive(reg) || virtualRegisterThatIsNotAlwaysLiveIsLive(getLiveness(bytecodeIndex, point), reg);
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}
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private:
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friend class BytecodeLivenessAnalysis;
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static size_t toIndex(BytecodeIndex bytecodeIndex) { return bytecodeIndex.offset() + bytecodeIndex.checkpoint(); }
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// FIXME: Use FastBitVector's view mechanism to make them compact.
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// https://bugs.webkit.org/show_bug.cgi?id=204427
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Vector<FastBitVector, 0, UnsafeVectorOverflow> m_usesBefore;
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Vector<FastBitVector, 0, UnsafeVectorOverflow> m_usesAfter;
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};
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} // namespace JSC
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