mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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63 lines
2.2 KiB
C++
63 lines
2.2 KiB
C++
/*
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* Copyright (C) 2016 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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class Edge;
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struct AbstractValue;
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struct Node;
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// Use this as a stub for things that can optionally take some kind of abstract state but you wish
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// to not pass any abstract state. This works if the templatized code also does a check (using the
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// operator bool) to see if the state is valid.
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class NullAbstractState {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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NullAbstractState() { }
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explicit operator bool() const { return false; }
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AbstractValue& forNode(Node*)
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{
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RELEASE_ASSERT_NOT_REACHED();
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return *bitwise_cast<AbstractValue*>(static_cast<intptr_t>(0x1234));
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}
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AbstractValue& forNode(Edge)
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{
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return forNode(nullptr);
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}
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// It's valid to add more stub methods here as needed.
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};
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} } // namespace JSC::DFG
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#endif // ENABLE(DFG_JIT)
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