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/*
* Copyright (C) 2011 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.
*/
#ifndef DFGOSRExit_h
#define DFGOSRExit_h
#include <wtf/Platform.h>
#if ENABLE(DFG_JIT)
#include "CodeOrigin.h"
#include "DFGCommon.h"
#include "DFGExitProfile.h"
#include "DFGGPRInfo.h"
#include "DFGValueRecoveryOverride.h"
#include "MacroAssembler.h"
#include "MethodOfGettingAValueProfile.h"
#include "Operands.h"
#include "ValueProfile.h"
#include "ValueRecovery.h"
#include <wtf/Vector.h>
namespace JSC { namespace DFG {
class SpeculativeJIT;
// This enum describes the types of additional recovery that
// may need be performed should a speculation check fail.
enum SpeculationRecoveryType {
SpeculativeAdd,
BooleanSpeculationCheck
};
// === SpeculationRecovery ===
//
// This class provides additional information that may be associated with a
// speculation check - for example
class SpeculationRecovery {
public:
SpeculationRecovery(SpeculationRecoveryType type, GPRReg dest, GPRReg src)
: m_type(type)
, m_dest(dest)
, m_src(src)
{
}
SpeculationRecoveryType type() { return m_type; }
GPRReg dest() { return m_dest; }
GPRReg src() { return m_src; }
private:
// Indicates the type of additional recovery to be performed.
SpeculationRecoveryType m_type;
// different recovery types may required different additional information here.
GPRReg m_dest;
GPRReg m_src;
};
// === OSRExit ===
//
// This structure describes how to exit the speculative path by
// going into baseline code.
struct OSRExit {
OSRExit(ExitKind, JSValueSource, MethodOfGettingAValueProfile, SpeculativeJIT*, unsigned streamIndex, unsigned recoveryIndex = 0);
MacroAssemblerCodeRef m_code;
JSValueSource m_jsValueSource;
MethodOfGettingAValueProfile m_valueProfile;
unsigned m_patchableCodeOffset;
CodeOrigin m_codeOrigin;
CodeOrigin m_codeOriginForExitProfile;
unsigned m_recoveryIndex;
unsigned m_watchpointIndex;
ExitKind m_kind;
uint32_t m_count;
bool considerAddingAsFrequentExitSite(CodeBlock* profiledCodeBlock)
{
if (!m_count || !exitKindIsCountable(m_kind))
return false;
return considerAddingAsFrequentExitSiteSlow(profiledCodeBlock);
}
void setPatchableCodeOffset(MacroAssembler::PatchableJump);
MacroAssembler::Jump getPatchableCodeOffsetAsJump() const;
CodeLocationJump codeLocationForRepatch(CodeBlock*) const;
void correctJump(LinkBuffer&);
unsigned m_streamIndex;
int m_lastSetOperand;
RefPtr<ValueRecoveryOverride> m_valueRecoveryOverride;
private:
bool considerAddingAsFrequentExitSiteSlow(CodeBlock* profiledCodeBlock);
};
struct SpeculationFailureDebugInfo {
CodeBlock* codeBlock;
};
} } // namespace JSC::DFG
#endif // ENABLE(DFG_JIT)
#endif // DFGOSRExit_h
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