mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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52 lines
2.2 KiB
C++
52 lines
2.2 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. ``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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namespace JSC { namespace DFG {
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// Tells you if an operation that filters type (i.e. does a type check/speculation) will always
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// exit. Formally, this means that the proven type of a value prior to the filter was not
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// bottom (i.e. not "clear" or "SpecEmpty") but becomes bottom as a result of executing the
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// filter.
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//
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// Note that per this definition, a filter will not return Contradiction if the node's proven
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// type was already bottom. This is necessary because we have this yucky convention of using
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// a proven type of bottom for nodes that don't hold JS values, like Phi nodes in ThreadedCPS
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// and storage nodes.
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enum FiltrationResult {
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// Means that this operation may not always exit.
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FiltrationOK,
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// Means that this operation will always exit.
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Contradiction
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};
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} } // namespace JSC::DFG
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#endif // ENABLE(DFG_JIT)
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