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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.
*/
#ifndef DFGOSRExitCompilerCommon_h
#define DFGOSRExitCompilerCommon_h
#if ENABLE(DFG_JIT)
#include "CCallHelpers.h"
#include "DFGOSRExit.h"
#include "DFGCommonData.h"
#include "DFGJITCode.h"
#include "FTLJITCode.h"
#include "RegisterSet.h"
namespace JSC { namespace DFG {
void handleExitCounts(CCallHelpers&, const OSRExitBase&);
void reifyInlinedCallFrames(CCallHelpers&, const OSRExitBase&);
void adjustAndJumpToTarget(CCallHelpers&, const OSRExitBase&);
template <typename JITCodeType>
void adjustFrameAndStackInOSRExitCompilerThunk(MacroAssembler& jit, VM* vm, JITCode::JITType jitType)
{
ASSERT(jitType == JITCode::DFGJIT || jitType == JITCode::FTLJIT);
bool isFTLOSRExit = jitType == JITCode::FTLJIT;
RegisterSet registersToPreserve;
registersToPreserve.set(GPRInfo::regT0);
if (isFTLOSRExit) {
// FTL can use the scratch registers for values. The code below uses
// the scratch registers. We need to preserve them before doing anything.
registersToPreserve.merge(RegisterSet::macroScratchRegisters());
}
size_t scratchSize = sizeof(void*) * registersToPreserve.numberOfSetGPRs();
if (isFTLOSRExit)
scratchSize += sizeof(void*);
ScratchBuffer* scratchBuffer = vm->scratchBufferForSize(scratchSize);
char* buffer = static_cast<char*>(scratchBuffer->dataBuffer());
jit.pushToSave(GPRInfo::regT1);
jit.move(MacroAssembler::TrustedImmPtr(buffer), GPRInfo::regT1);
unsigned storeOffset = 0;
registersToPreserve.forEach([&](Reg reg) {
jit.storePtr(reg.gpr(), MacroAssembler::Address(GPRInfo::regT1, storeOffset));
storeOffset += sizeof(void*);
});
if (isFTLOSRExit) {
// FTL OSRExits are entered via the code FTLExitThunkGenerator emits which does
// pushToSaveImmediateWithoutTouchRegisters with the OSR exit index. We need to load
// that top value and then push it back when we reset our SP.
jit.loadPtr(MacroAssembler::Address(MacroAssembler::stackPointerRegister, MacroAssembler::pushToSaveByteOffset()), GPRInfo::regT0);
jit.storePtr(GPRInfo::regT0, MacroAssembler::Address(GPRInfo::regT1, registersToPreserve.numberOfSetGPRs() * sizeof(void*)));
}
jit.popToRestore(GPRInfo::regT1);
// We need to reset FP in the case of an exception.
jit.loadPtr(vm->addressOfCallFrameForCatch(), GPRInfo::regT0);
MacroAssembler::Jump didNotHaveException = jit.branchTestPtr(MacroAssembler::Zero, GPRInfo::regT0);
jit.move(GPRInfo::regT0, GPRInfo::callFrameRegister);
didNotHaveException.link(&jit);
// We need to make sure SP is correct in case of an exception.
jit.loadPtr(MacroAssembler::Address(GPRInfo::callFrameRegister, JSStack::CodeBlock * static_cast<int>(sizeof(Register))), GPRInfo::regT0);
jit.loadPtr(MacroAssembler::Address(GPRInfo::regT0, CodeBlock::jitCodeOffset()), GPRInfo::regT0);
jit.addPtr(MacroAssembler::TrustedImm32(JITCodeType::commonDataOffset()), GPRInfo::regT0);
jit.load32(MacroAssembler::Address(GPRInfo::regT0, CommonData::frameRegisterCountOffset()), GPRInfo::regT0);
// This does virtualRegisterForLocal(frameRegisterCount - 1)*sizeof(Register) where:
// virtualRegisterForLocal(frameRegisterCount - 1)
// = VirtualRegister::localToOperand(frameRegisterCount - 1)
// = -1 - (frameRegisterCount - 1)
// = -frameRegisterCount
jit.neg32(GPRInfo::regT0);
jit.mul32(MacroAssembler::TrustedImm32(sizeof(Register)), GPRInfo::regT0, GPRInfo::regT0);
#if USE(JSVALUE64)
jit.signExtend32ToPtr(GPRInfo::regT0, GPRInfo::regT0);
#endif
jit.addPtr(GPRInfo::callFrameRegister, GPRInfo::regT0);
jit.move(GPRInfo::regT0, MacroAssembler::stackPointerRegister);
if (isFTLOSRExit) {
// Leave space for saving the OSR Exit Index.
jit.subPtr(MacroAssembler::TrustedImm32(MacroAssembler::pushToSaveByteOffset()), MacroAssembler::stackPointerRegister);
}
jit.pushToSave(GPRInfo::regT1);
jit.move(MacroAssembler::TrustedImmPtr(buffer), GPRInfo::regT1);
if (isFTLOSRExit) {
// FTL OSRExits are entered via FTLExitThunkGenerator code with does
// pushToSaveImmediateWithoutTouchRegisters. We need to load that top
// register and then store it back when we have our SP back to a safe value.
jit.loadPtr(MacroAssembler::Address(GPRInfo::regT1, registersToPreserve.numberOfSetGPRs() * sizeof(void*)), GPRInfo::regT0);
jit.storePtr(GPRInfo::regT0, MacroAssembler::Address(MacroAssembler::stackPointerRegister, MacroAssembler::pushToSaveByteOffset()));
}
unsigned loadOffset = 0;
registersToPreserve.forEach([&](Reg reg) {
jit.loadPtr(MacroAssembler::Address(GPRInfo::regT1, loadOffset), reg.gpr());
loadOffset += sizeof(void*);
});
jit.popToRestore(GPRInfo::regT1);
}
} } // namespace JSC::DFG
#endif // ENABLE(DFG_JIT)
#endif // DFGOSRExitCompilerCommon_h
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