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/*
* Copyright (C) 2011-2017 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 "DFGOSRExitBase.h"
#include "GPRInfo.h"
#include "MacroAssembler.h"
#include "MethodOfGettingAValueProfile.h"
#include "Operands.h"
#include "ValueRecovery.h"
namespace JSC {
class CCallHelpers;
namespace DFG {
class SpeculativeJIT;
struct BasicBlock;
struct Node;
// This enum describes the types of additional recovery that
// may need be performed should a speculation check fail.
enum SpeculationRecoveryType : uint8_t {
SpeculativeAdd,
SpeculativeAddImmediate,
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_src(src)
, m_dest(dest)
, m_type(type)
{
ASSERT(m_type == SpeculativeAdd || m_type == BooleanSpeculationCheck);
}
SpeculationRecovery(SpeculationRecoveryType type, GPRReg dest, int32_t immediate)
: m_immediate(immediate)
, m_dest(dest)
, m_type(type)
{
ASSERT(m_type == SpeculativeAddImmediate);
}
SpeculationRecoveryType type() { return m_type; }
GPRReg dest() { return m_dest; }
GPRReg src() { return m_src; }
int32_t immediate() { return m_immediate; }
private:
// different recovery types may required different additional information here.
union {
GPRReg m_src;
int32_t m_immediate;
};
GPRReg m_dest;
// Indicates the type of additional recovery to be performed.
SpeculationRecoveryType m_type;
};
// === OSRExit ===
//
// This structure describes how to exit the speculative path by
// going into baseline code.
struct OSRExit : public OSRExitBase {
OSRExit(ExitKind, JSValueSource, MethodOfGettingAValueProfile, SpeculativeJIT*, unsigned streamIndex, unsigned recoveryIndex = UINT_MAX);
static void JIT_OPERATION compileOSRExit(ExecState*) WTF_INTERNAL;
unsigned m_patchableCodeOffset { 0 };
MacroAssemblerCodeRef m_code;
JSValueSource m_jsValueSource;
MethodOfGettingAValueProfile m_valueProfile;
unsigned m_recoveryIndex;
void setPatchableCodeOffset(MacroAssembler::PatchableJump);
MacroAssembler::Jump getPatchableCodeOffsetAsJump() const;
CodeLocationJump codeLocationForRepatch(CodeBlock*) const;
void correctJump(LinkBuffer&);
unsigned m_streamIndex;
void considerAddingAsFrequentExitSite(CodeBlock* profiledCodeBlock)
{
OSRExitBase::considerAddingAsFrequentExitSite(profiledCodeBlock, ExitFromDFG);
}
private:
static void compileExit(CCallHelpers&, VM&, const OSRExit&, const Operands<ValueRecovery>&, SpeculationRecovery*);
static void emitRestoreArguments(CCallHelpers&, const Operands<ValueRecovery>&);
static void JIT_OPERATION debugOperationPrintSpeculationFailure(ExecState*, void*, void*) WTF_INTERNAL;
};
struct SpeculationFailureDebugInfo {
CodeBlock* codeBlock;
ExitKind kind;
unsigned bytecodeOffset;
};
} } // namespace JSC::DFG
#endif // ENABLE(DFG_JIT)
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