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91 lines (75 loc) · 2.77 KB
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/*
* Copyright (C) 2018 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#if ENABLE(DFG_JIT)
#include "DFGEpoch.h"
#include "DFGStructureClobberState.h"
#include <wtf/PrintStream.h>
namespace JSC { namespace DFG {
class AbstractValueClobberEpoch {
public:
AbstractValueClobberEpoch()
{
}
static AbstractValueClobberEpoch first(StructureClobberState clobberState)
{
AbstractValueClobberEpoch result;
result.m_value = Epoch::first().toUnsigned() << epochShift;
switch (clobberState) {
case StructuresAreWatched:
result.m_value |= watchedFlag;
break;
case StructuresAreClobbered:
break;
}
return result;
}
void clobber()
{
m_value += step;
m_value &= ~watchedFlag;
}
void observeInvalidationPoint()
{
m_value |= watchedFlag;
}
friend bool operator==(const AbstractValueClobberEpoch&, const AbstractValueClobberEpoch&) = default;
StructureClobberState structureClobberState() const
{
return m_value & watchedFlag ? StructuresAreWatched : StructuresAreClobbered;
}
Epoch clobberEpoch() const
{
return Epoch::fromUnsigned(m_value >> epochShift);
}
void dump(PrintStream&) const;
private:
static constexpr unsigned step = 2;
static constexpr unsigned watchedFlag = 1;
static constexpr unsigned epochShift = 1;
unsigned m_value { 0 };
};
} } // namespace JSC::DFG
#endif // ENABLE(DFG_JIT)