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/*
* Copyright (C) 2013, 2015 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 "CodeOrigin.h"
#include "DFGExitProfile.h"
namespace JSC { namespace DFG {
class BasicBlock;
struct Node;
// Provides for the OSR exit profiling functionality that is common between the DFG
// and the FTL.
struct OSRExitBase {
OSRExitBase(ExitKind kind, CodeOrigin origin, CodeOrigin originForProfile, bool wasHoisted, uint32_t dfgNodeIndex)
: m_kind(kind)
, m_wasHoisted(wasHoisted)
, m_codeOrigin(origin)
, m_codeOriginForExitProfile(originForProfile)
, m_dfgNodeIndex(dfgNodeIndex)
{
ASSERT(m_codeOrigin.isSet());
ASSERT(m_codeOriginForExitProfile.isSet());
}
uint32_t m_count { 0 };
ExitKind m_kind;
bool m_wasHoisted;
CodeOrigin m_codeOrigin;
CodeOrigin m_codeOriginForExitProfile;
CallSiteIndex m_exceptionHandlerCallSiteIndex;
uint32_t m_dfgNodeIndex;
ALWAYS_INLINE bool isExceptionHandler() const
{
return m_kind == ExceptionCheck || m_kind == GenericUnwind;
}
// True if this exit is used as an exception handler for unwinding. This happens to only be set when
// isExceptionHandler is true, but all this actually means is that the OSR exit will assume that the
// machine state is as it would be coming out of genericUnwind.
ALWAYS_INLINE bool isGenericUnwindHandler() const
{
return m_kind == GenericUnwind;
}
ALWAYS_INLINE bool isExitingToCheckpointHandler() const
{
return m_codeOrigin.bytecodeIndex().checkpoint();
}
protected:
void considerAddingAsFrequentExitSite(CodeBlock* profiledCodeBlock, ExitingJITType jitType)
{
if (m_count)
considerAddingAsFrequentExitSiteSlow(profiledCodeBlock, jitType);
}
private:
void considerAddingAsFrequentExitSiteSlow(CodeBlock* profiledCodeBlock, ExitingJITType);
};
} } // namespace JSC::DFG
#endif // ENABLE(DFG_JIT)
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