mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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126 lines
3.0 KiB
C++
126 lines
3.0 KiB
C++
/*
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* Copyright (C) 2015-2019 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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// Utility class for epoch-based analyses.
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class Epoch {
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public:
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Epoch()
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: m_epoch(s_none)
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{
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}
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static Epoch fromUnsigned(unsigned value)
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{
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Epoch result;
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result.m_epoch = value;
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return result;
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}
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unsigned toUnsigned() const
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{
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return m_epoch;
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}
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static Epoch first()
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{
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Epoch result;
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result.m_epoch = s_first;
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return result;
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}
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bool operator!() const
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{
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return m_epoch == s_none;
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}
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explicit operator bool() const
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{
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return !!*this;
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}
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Epoch next() const
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{
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Epoch result;
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result.m_epoch = m_epoch + 1;
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return result;
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}
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void bump()
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{
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*this = next();
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}
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bool operator==(const Epoch& other) const
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{
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return m_epoch == other.m_epoch;
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}
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bool operator!=(const Epoch& other) const
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{
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return !(*this == other);
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}
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bool operator<(const Epoch& other) const
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{
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return m_epoch < other.m_epoch;
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}
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bool operator>(const Epoch& other) const
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{
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return other < *this;
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}
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bool operator<=(const Epoch& other) const
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{
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return !(*this > other);
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}
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bool operator>=(const Epoch& other) const
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{
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return !(*this < other);
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}
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void dump(PrintStream&) const;
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private:
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static constexpr unsigned s_none = 0;
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static constexpr unsigned s_first = 1;
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unsigned m_epoch;
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};
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} } // namespace JSC::DFG
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#endif // ENABLE(DFG_JIT)
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