mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2025-02-17 02:18:14 +00:00
100 lines
2.9 KiB
C++
100 lines
2.9 KiB
C++
/*
|
|
* 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;
|
|
}
|
|
|
|
bool operator==(const AbstractValueClobberEpoch& other) const
|
|
{
|
|
return m_value == other.m_value;
|
|
}
|
|
|
|
bool operator!=(const AbstractValueClobberEpoch& other) const
|
|
{
|
|
return !(*this == other);
|
|
}
|
|
|
|
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)
|