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/*
* Copyright (C) 2013 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.
*/
#include "config.h"
#include "FTLThunks.h"
#if ENABLE(FTL_JIT)
#include "AssemblyHelpers.h"
#include "DFGOSRExitCompilerCommon.h"
#include "FPRInfo.h"
#include "FTLOSRExitCompiler.h"
#include "FTLOperations.h"
#include "FTLSaveRestore.h"
#include "GPRInfo.h"
#include "LinkBuffer.h"
namespace JSC { namespace FTL {
using namespace DFG;
enum class FrameAndStackAdjustmentRequirement {
Needed,
NotNeeded
};
static MacroAssemblerCodeRef genericGenerationThunkGenerator(
VM* vm, FunctionPtr generationFunction, const char* name, unsigned extraPopsToRestore, FrameAndStackAdjustmentRequirement frameAndStackAdjustmentRequirement)
{
AssemblyHelpers jit(vm, 0);
if (frameAndStackAdjustmentRequirement == FrameAndStackAdjustmentRequirement::Needed) {
// This needs to happen before we use the scratch buffer because this function also uses the scratch buffer.
adjustFrameAndStackInOSRExitCompilerThunk<FTL::JITCode>(jit, vm, JITCode::FTLJIT);
}
// Note that the "return address" will be the ID that we pass to the generation function.
ptrdiff_t stackMisalignment = MacroAssembler::pushToSaveByteOffset();
// Pretend that we're a C call frame.
jit.pushToSave(MacroAssembler::framePointerRegister);
jit.move(MacroAssembler::stackPointerRegister, MacroAssembler::framePointerRegister);
stackMisalignment += MacroAssembler::pushToSaveByteOffset();
// Now create ourselves enough stack space to give saveAllRegisters() a scratch slot.
unsigned numberOfRequiredPops = 0;
do {
jit.pushToSave(GPRInfo::regT0);
stackMisalignment += MacroAssembler::pushToSaveByteOffset();
numberOfRequiredPops++;
} while (stackMisalignment % stackAlignmentBytes());
ScratchBuffer* scratchBuffer = vm->scratchBufferForSize(requiredScratchMemorySizeInBytes());
char* buffer = static_cast<char*>(scratchBuffer->dataBuffer());
saveAllRegisters(jit, buffer);
// Tell GC mark phase how much of the scratch buffer is active during call.
jit.move(MacroAssembler::TrustedImmPtr(scratchBuffer->activeLengthPtr()), GPRInfo::nonArgGPR0);
jit.storePtr(MacroAssembler::TrustedImmPtr(requiredScratchMemorySizeInBytes()), GPRInfo::nonArgGPR0);
jit.loadPtr(GPRInfo::callFrameRegister, GPRInfo::argumentGPR0);
jit.peek(
GPRInfo::argumentGPR1,
(stackMisalignment - MacroAssembler::pushToSaveByteOffset()) / sizeof(void*));
MacroAssembler::Call functionCall = jit.call();
// At this point we want to make a tail call to what was returned to us in the
// returnValueGPR. But at the same time as we do this, we must restore all registers.
// The way we will accomplish this is by arranging to have the tail call target in the
// return address "slot" (be it a register or the stack).
jit.move(GPRInfo::returnValueGPR, GPRInfo::regT0);
// Make sure we tell the GC that we're not using the scratch buffer anymore.
jit.move(MacroAssembler::TrustedImmPtr(scratchBuffer->activeLengthPtr()), GPRInfo::regT1);
jit.storePtr(MacroAssembler::TrustedImmPtr(0), GPRInfo::regT1);
// Prepare for tail call.
while (numberOfRequiredPops--)
jit.popToRestore(GPRInfo::regT1);
jit.popToRestore(MacroAssembler::framePointerRegister);
// When we came in here, there was an additional thing pushed to the stack. Some clients want it
// popped before proceeding.
while (extraPopsToRestore--)
jit.popToRestore(GPRInfo::regT1);
// Put the return address wherever the return instruction wants it. On all platforms, this
// ensures that the return address is out of the way of register restoration.
jit.restoreReturnAddressBeforeReturn(GPRInfo::regT0);
restoreAllRegisters(jit, buffer);
jit.ret();
LinkBuffer patchBuffer(*vm, jit, GLOBAL_THUNK_ID);
patchBuffer.link(functionCall, generationFunction);
return FINALIZE_CODE(patchBuffer, ("%s", name));
}
MacroAssemblerCodeRef osrExitGenerationThunkGenerator(VM* vm)
{
unsigned extraPopsToRestore = 0;
return genericGenerationThunkGenerator(
vm, compileFTLOSRExit, "FTL OSR exit generation thunk", extraPopsToRestore, FrameAndStackAdjustmentRequirement::Needed);
}
MacroAssemblerCodeRef lazySlowPathGenerationThunkGenerator(VM* vm)
{
unsigned extraPopsToRestore = 1;
return genericGenerationThunkGenerator(
vm, compileFTLLazySlowPath, "FTL lazy slow path generation thunk", extraPopsToRestore, FrameAndStackAdjustmentRequirement::NotNeeded);
}
static void registerClobberCheck(AssemblyHelpers& jit, RegisterSet dontClobber)
{
if (!Options::clobberAllRegsInFTLICSlowPath())
return;
RegisterSet clobber = RegisterSet::allRegisters();
clobber.exclude(RegisterSet::reservedHardwareRegisters());
clobber.exclude(RegisterSet::stackRegisters());
clobber.exclude(RegisterSet::calleeSaveRegisters());
clobber.exclude(dontClobber);
GPRReg someGPR;
for (Reg reg = Reg::first(); reg <= Reg::last(); reg = reg.next()) {
if (!clobber.get(reg) || !reg.isGPR())
continue;
jit.move(AssemblyHelpers::TrustedImm32(0x1337beef), reg.gpr());
someGPR = reg.gpr();
}
for (Reg reg = Reg::first(); reg <= Reg::last(); reg = reg.next()) {
if (!clobber.get(reg) || !reg.isFPR())
continue;
jit.move64ToDouble(someGPR, reg.fpr());
}
}
MacroAssemblerCodeRef slowPathCallThunkGenerator(VM& vm, const SlowPathCallKey& key)
{
AssemblyHelpers jit(&vm, 0);
// We want to save the given registers at the given offset, then we want to save the
// old return address somewhere past that offset, and then finally we want to make the
// call.
size_t currentOffset = key.offset() + sizeof(void*);
#if CPU(X86) || CPU(X86_64)
currentOffset += sizeof(void*);
#endif
for (MacroAssembler::RegisterID reg = MacroAssembler::firstRegister(); reg <= MacroAssembler::lastRegister(); reg = static_cast<MacroAssembler::RegisterID>(reg + 1)) {
if (!key.usedRegisters().get(reg))
continue;
jit.storePtr(reg, AssemblyHelpers::Address(MacroAssembler::stackPointerRegister, currentOffset));
currentOffset += sizeof(void*);
}
for (MacroAssembler::FPRegisterID reg = MacroAssembler::firstFPRegister(); reg <= MacroAssembler::lastFPRegister(); reg = static_cast<MacroAssembler::FPRegisterID>(reg + 1)) {
if (!key.usedRegisters().get(reg))
continue;
jit.storeDouble(reg, AssemblyHelpers::Address(MacroAssembler::stackPointerRegister, currentOffset));
currentOffset += sizeof(double);
}
jit.preserveReturnAddressAfterCall(GPRInfo::nonArgGPR0);
jit.storePtr(GPRInfo::nonArgGPR0, AssemblyHelpers::Address(MacroAssembler::stackPointerRegister, key.offset()));
registerClobberCheck(jit, key.argumentRegisters());
AssemblyHelpers::Call call = jit.call();
jit.loadPtr(AssemblyHelpers::Address(MacroAssembler::stackPointerRegister, key.offset()), GPRInfo::nonPreservedNonReturnGPR);
jit.restoreReturnAddressBeforeReturn(GPRInfo::nonPreservedNonReturnGPR);
for (MacroAssembler::FPRegisterID reg = MacroAssembler::lastFPRegister(); ; reg = static_cast<MacroAssembler::FPRegisterID>(reg - 1)) {
if (key.usedRegisters().get(reg)) {
currentOffset -= sizeof(double);
jit.loadDouble(AssemblyHelpers::Address(MacroAssembler::stackPointerRegister, currentOffset), reg);
}
if (reg == MacroAssembler::firstFPRegister())
break;
}
for (MacroAssembler::RegisterID reg = MacroAssembler::lastRegister(); ; reg = static_cast<MacroAssembler::RegisterID>(reg - 1)) {
if (key.usedRegisters().get(reg)) {
currentOffset -= sizeof(void*);
jit.loadPtr(AssemblyHelpers::Address(MacroAssembler::stackPointerRegister, currentOffset), reg);
}
if (reg == MacroAssembler::firstRegister())
break;
}
jit.ret();
LinkBuffer patchBuffer(vm, jit, GLOBAL_THUNK_ID);
patchBuffer.link(call, FunctionPtr(key.callTarget()));
return FINALIZE_CODE(patchBuffer, ("FTL slow path call thunk for %s", toCString(key).data()));
}
} } // namespace JSC::FTL
#endif // ENABLE(FTL_JIT)
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