mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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67 lines
2.3 KiB
C++
67 lines
2.3 KiB
C++
/*
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* Copyright (C) 2014, 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. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#if ENABLE(DFG_JIT)
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#include <wtf/PrintStream.h>
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namespace JSC { namespace DFG {
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enum ValueStrength {
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// The value has been used for optimization and it arose through inference. We don't want the
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// fact that we optimized the code to result in the GC keeping this value alive unnecessarily,
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// so we'd rather kill the code and recompile than keep the object alive longer.
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WeakValue,
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// The code will keep this value alive. This is true of constants that were present in the
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// source. String constants tend to be strong.
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StrongValue
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};
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inline ValueStrength merge(ValueStrength a, ValueStrength b)
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{
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switch (a) {
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case WeakValue:
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return b;
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case StrongValue:
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return StrongValue;
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}
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RELEASE_ASSERT_NOT_REACHED();
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return WeakValue;
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}
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} } // namespace JSC::DFG
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namespace WTF {
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void printInternal(PrintStream&, JSC::DFG::ValueStrength);
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} // namespace WTF
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#endif // ENABLE(DFG_JIT)
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