void OSRExitCompiler::handleExitCounts(const OSRExit& exit)
{
m_jit.add32(AssemblyHelpers::TrustedImm32(1), AssemblyHelpers::AbsoluteAddress(&exit.m_count));
m_jit.move(AssemblyHelpers::TrustedImmPtr(m_jit.codeBlock()), GPRInfo::regT0);
AssemblyHelpers::JumpList tooFewFails;
if (exit.m_kind == InadequateCoverage) {
// Proceed based on the assumption that we can profitably optimize this code once
// it has executed enough times.
m_jit.load32(AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfForcedOSRExitCounter()), GPRInfo::regT2);
m_jit.load32(AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfSpeculativeSuccessCounter()), GPRInfo::regT1);
m_jit.add32(AssemblyHelpers::TrustedImm32(1), GPRInfo::regT2);
m_jit.add32(AssemblyHelpers::TrustedImm32(-1), GPRInfo::regT1);
m_jit.store32(GPRInfo::regT2, AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfForcedOSRExitCounter()));
m_jit.store32(GPRInfo::regT1, AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfSpeculativeSuccessCounter()));
tooFewFails.append(m_jit.branch32(AssemblyHelpers::BelowOrEqual, GPRInfo::regT2, AssemblyHelpers::TrustedImm32(Options::forcedOSRExitCountForReoptimization)));
} else {
// Proceed based on the assumption that we can handle these exits so long as they
// don't get too frequent.
m_jit.load32(AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfSpeculativeFailCounter()), GPRInfo::regT2);
m_jit.load32(AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfSpeculativeSuccessCounter()), GPRInfo::regT1);
m_jit.add32(AssemblyHelpers::TrustedImm32(1), GPRInfo::regT2);
m_jit.add32(AssemblyHelpers::TrustedImm32(-1), GPRInfo::regT1);
m_jit.store32(GPRInfo::regT2, AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfSpeculativeFailCounter()));
m_jit.store32(GPRInfo::regT1, AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfSpeculativeSuccessCounter()));
m_jit.move(AssemblyHelpers::TrustedImmPtr(m_jit.baselineCodeBlock()), GPRInfo::regT0);
tooFewFails.append(m_jit.branch32(AssemblyHelpers::BelowOrEqual, GPRInfo::regT2, AssemblyHelpers::TrustedImm32(m_jit.codeBlock()->largeFailCountThreshold())));
m_jit.mul32(AssemblyHelpers::TrustedImm32(Options::desiredSpeculativeSuccessFailRatio), GPRInfo::regT2, GPRInfo::regT2);
tooFewFails.append(m_jit.branch32(AssemblyHelpers::BelowOrEqual, GPRInfo::regT2, GPRInfo::regT1));
}
// Reoptimize as soon as possible.
m_jit.store32(AssemblyHelpers::TrustedImm32(0), AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecuteCounter()));
m_jit.store32(AssemblyHelpers::TrustedImm32(0), AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecutionActiveThreshold()));
AssemblyHelpers::Jump doneAdjusting = m_jit.jump();
tooFewFails.link(&m_jit);
// Adjust the execution counter such that the target is to only optimize after a while.
int32_t targetValue =
ExecutionCounter::applyMemoryUsageHeuristicsAndConvertToInt(
m_jit.baselineCodeBlock()->counterValueForOptimizeAfterLongWarmUp(),
m_jit.baselineCodeBlock());
m_jit.store32(AssemblyHelpers::TrustedImm32(-targetValue), AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecuteCounter()));
m_jit.store32(AssemblyHelpers::TrustedImm32(targetValue), AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecutionActiveThreshold()));
m_jit.store32(AssemblyHelpers::TrustedImm32(ExecutionCounter::formattedTotalCount(targetValue)), AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecutionTotalCount()));
doneAdjusting.link(&m_jit);
}
static void osrWriteBarrier(CCallHelpers& jit, GPRReg owner, GPRReg scratch)
{
AssemblyHelpers::Jump ownerIsRememberedOrInEden = jit.jumpIfIsRememberedOrInEden(owner);
// We need these extra slots because setupArgumentsWithExecState will use poke on x86.
#if CPU(X86)
jit.subPtr(MacroAssembler::TrustedImm32(sizeof(void*) * 3), MacroAssembler::stackPointerRegister);
#endif
jit.setupArgumentsWithExecState(owner);
jit.move(MacroAssembler::TrustedImmPtr(reinterpret_cast<void*>(operationOSRWriteBarrier)), scratch);
jit.call(scratch);
#if CPU(X86)
jit.addPtr(MacroAssembler::TrustedImm32(sizeof(void*) * 3), MacroAssembler::stackPointerRegister);
#endif
ownerIsRememberedOrInEden.link(&jit);
}
static void osrWriteBarrier(CCallHelpers& jit, GPRReg owner, GPRReg scratch1, GPRReg scratch2)
{
AssemblyHelpers::Jump definitelyNotMarked = jit.genericWriteBarrier(owner, scratch1, scratch2);
// We need these extra slots because setupArgumentsWithExecState will use poke on x86.
#if CPU(X86)
jit.subPtr(MacroAssembler::TrustedImm32(sizeof(void*) * 3), MacroAssembler::stackPointerRegister);
#endif
jit.setupArgumentsWithExecState(owner);
jit.move(MacroAssembler::TrustedImmPtr(reinterpret_cast<void*>(operationOSRWriteBarrier)), scratch1);
jit.call(scratch1);
#if CPU(X86)
jit.addPtr(MacroAssembler::TrustedImm32(sizeof(void*) * 3), MacroAssembler::stackPointerRegister);
#endif
definitelyNotMarked.link(&jit);
}
void OSRExitCompiler::handleExitCounts(const OSRExit& exit)
{
m_jit.add32(AssemblyHelpers::TrustedImm32(1), AssemblyHelpers::AbsoluteAddress(&exit.m_count));
m_jit.move(AssemblyHelpers::TrustedImmPtr(m_jit.codeBlock()), GPRInfo::regT0);
AssemblyHelpers::Jump tooFewFails;
m_jit.load32(AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfOSRExitCounter()), GPRInfo::regT2);
m_jit.add32(AssemblyHelpers::TrustedImm32(1), GPRInfo::regT2);
m_jit.store32(GPRInfo::regT2, AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfOSRExitCounter()));
m_jit.move(AssemblyHelpers::TrustedImmPtr(m_jit.baselineCodeBlock()), GPRInfo::regT0);
tooFewFails = m_jit.branch32(AssemblyHelpers::BelowOrEqual, GPRInfo::regT2, AssemblyHelpers::TrustedImm32(m_jit.codeBlock()->exitCountThresholdForReoptimization()));
// Reoptimize as soon as possible.
#if !NUMBER_OF_ARGUMENT_REGISTERS
m_jit.poke(GPRInfo::regT0);
#else
m_jit.move(GPRInfo::regT0, GPRInfo::argumentGPR0);
ASSERT(GPRInfo::argumentGPR0 != GPRInfo::regT1);
#endif
m_jit.move(AssemblyHelpers::TrustedImmPtr(bitwise_cast<void*>(triggerReoptimizationNow)), GPRInfo::regT1);
m_jit.call(GPRInfo::regT1);
AssemblyHelpers::Jump doneAdjusting = m_jit.jump();
tooFewFails.link(&m_jit);
// Adjust the execution counter such that the target is to only optimize after a while.
int32_t activeThreshold =
m_jit.baselineCodeBlock()->counterValueForOptimizeAfterLongWarmUp();
int32_t targetValue = ExecutionCounter::applyMemoryUsageHeuristicsAndConvertToInt(
activeThreshold, m_jit.baselineCodeBlock());
int32_t clippedValue =
ExecutionCounter::clippedThreshold(m_jit.codeBlock()->globalObject(), targetValue);
m_jit.store32(AssemblyHelpers::TrustedImm32(-clippedValue), AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecuteCounter()));
m_jit.store32(AssemblyHelpers::TrustedImm32(activeThreshold), AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecutionActiveThreshold()));
m_jit.store32(AssemblyHelpers::TrustedImm32(ExecutionCounter::formattedTotalCount(clippedValue)), AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecutionTotalCount()));
doneAdjusting.link(&m_jit);
}
static void generateRegisterRestoration(AssemblyHelpers& jit)
{
#if ENABLE(FTL_JIT)
RegisterSet toSave = registersToPreserve();
ptrdiff_t offset = registerPreservationOffset();
ASSERT(!toSave.get(GPRInfo::regT4));
// We need to place the stack pointer back to where the caller thought they left it.
// But also, in order to recover the registers, we need to figure out how big the
// arguments area is.
jit.load32(
AssemblyHelpers::Address(
AssemblyHelpers::stackPointerRegister,
(JSStack::ArgumentCount - JSStack::CallerFrameAndPCSize) * sizeof(Register) + PayloadOffset),
GPRInfo::regT4);
jit.move(GPRInfo::regT4, GPRInfo::regT2);
jit.lshift32(AssemblyHelpers::TrustedImm32(3), GPRInfo::regT2);
jit.addPtr(AssemblyHelpers::TrustedImm32(offset), AssemblyHelpers::stackPointerRegister);
jit.addPtr(AssemblyHelpers::stackPointerRegister, GPRInfo::regT2);
// We saved things at:
//
// adjSP + (JSStack::CallFrameHeaderSize - JSStack::CallerFrameAndPCSize + NumArgs) * 8
//
// Where:
//
// adjSP = origSP - offset
//
// regT2 now points at:
//
// origSP + NumArgs * 8
// = adjSP + offset + NumArgs * 8
//
// So if we subtract offset and then add JSStack::CallFrameHeaderSize and subtract
// JSStack::CallerFrameAndPCSize, we'll get the thing we want.
ptrdiff_t currentOffset = -offset + sizeof(Register) * (
JSStack::CallFrameHeaderSize - JSStack::CallerFrameAndPCSize);
jit.loadPtr(AssemblyHelpers::Address(GPRInfo::regT2, currentOffset), GPRInfo::regT1);
for (GPRReg gpr = AssemblyHelpers::firstRegister(); gpr <= AssemblyHelpers::lastRegister(); gpr = static_cast<GPRReg>(gpr + 1)) {
if (!toSave.get(gpr))
continue;
currentOffset += sizeof(Register);
jit.load64(AssemblyHelpers::Address(GPRInfo::regT2, currentOffset), gpr);
}
// Thunks like this rely on the ArgumentCount being intact. Pay it forward.
jit.store32(
GPRInfo::regT4,
AssemblyHelpers::Address(
AssemblyHelpers::stackPointerRegister,
(JSStack::ArgumentCount - JSStack::CallerFrameAndPCSize) * sizeof(Register) + PayloadOffset));
if (!ASSERT_DISABLED) {
AssemblyHelpers::Jump ok = jit.branchPtr(
AssemblyHelpers::Above, GPRInfo::regT1, AssemblyHelpers::TrustedImmPtr(static_cast<size_t>(0x1000)));
jit.breakpoint();
ok.link(&jit);
}
jit.jump(GPRInfo::regT1);
#else // ENABLE(FTL_JIT)
UNUSED_PARAM(jit);
UNREACHABLE_FOR_PLATFORM();
#endif // ENABLE(FTL_JIT)
}
void handleExitCounts(CCallHelpers& jit, const OSRExitBase& exit)
{
jit.add32(AssemblyHelpers::TrustedImm32(1), AssemblyHelpers::AbsoluteAddress(&exit.m_count));
jit.move(AssemblyHelpers::TrustedImmPtr(jit.codeBlock()), GPRInfo::regT0);
AssemblyHelpers::Jump tooFewFails;
jit.load32(AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfOSRExitCounter()), GPRInfo::regT2);
jit.add32(AssemblyHelpers::TrustedImm32(1), GPRInfo::regT2);
jit.store32(GPRInfo::regT2, AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfOSRExitCounter()));
jit.move(AssemblyHelpers::TrustedImmPtr(jit.baselineCodeBlock()), GPRInfo::regT0);
AssemblyHelpers::Jump reoptimizeNow = jit.branch32(
AssemblyHelpers::GreaterThanOrEqual,
AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecuteCounter()),
AssemblyHelpers::TrustedImm32(0));
// We want to figure out if there's a possibility that we're in a loop. For the outermost
// code block in the inline stack, we handle this appropriately by having the loop OSR trigger
// check the exit count of the replacement of the CodeBlock from which we are OSRing. The
// problem is the inlined functions, which might also have loops, but whose baseline versions
// don't know where to look for the exit count. Figure out if those loops are severe enough
// that we had tried to OSR enter. If so, then we should use the loop reoptimization trigger.
// Otherwise, we should use the normal reoptimization trigger.
AssemblyHelpers::JumpList loopThreshold;
for (InlineCallFrame* inlineCallFrame = exit.m_codeOrigin.inlineCallFrame; inlineCallFrame; inlineCallFrame = inlineCallFrame->caller.inlineCallFrame) {
loopThreshold.append(
jit.branchTest8(
AssemblyHelpers::NonZero,
AssemblyHelpers::AbsoluteAddress(
inlineCallFrame->executable->addressOfDidTryToEnterInLoop())));
}
jit.move(
AssemblyHelpers::TrustedImm32(jit.codeBlock()->exitCountThresholdForReoptimization()),
GPRInfo::regT1);
if (!loopThreshold.empty()) {
AssemblyHelpers::Jump done = jit.jump();
loopThreshold.link(&jit);
jit.move(
AssemblyHelpers::TrustedImm32(
jit.codeBlock()->exitCountThresholdForReoptimizationFromLoop()),
GPRInfo::regT1);
done.link(&jit);
}
tooFewFails = jit.branch32(AssemblyHelpers::BelowOrEqual, GPRInfo::regT2, GPRInfo::regT1);
reoptimizeNow.link(&jit);
// Reoptimize as soon as possible.
#if !NUMBER_OF_ARGUMENT_REGISTERS
jit.poke(GPRInfo::regT0);
jit.poke(AssemblyHelpers::TrustedImmPtr(&exit), 1);
#else
jit.move(GPRInfo::regT0, GPRInfo::argumentGPR0);
jit.move(AssemblyHelpers::TrustedImmPtr(&exit), GPRInfo::argumentGPR1);
#endif
jit.move(AssemblyHelpers::TrustedImmPtr(bitwise_cast<void*>(triggerReoptimizationNow)), GPRInfo::nonArgGPR0);
jit.call(GPRInfo::nonArgGPR0);
AssemblyHelpers::Jump doneAdjusting = jit.jump();
tooFewFails.link(&jit);
// Adjust the execution counter such that the target is to only optimize after a while.
int32_t activeThreshold =
jit.baselineCodeBlock()->adjustedCounterValue(
Options::thresholdForOptimizeAfterLongWarmUp());
int32_t targetValue = applyMemoryUsageHeuristicsAndConvertToInt(
activeThreshold, jit.baselineCodeBlock());
int32_t clippedValue;
switch (jit.codeBlock()->jitType()) {
case JITCode::DFGJIT:
clippedValue = BaselineExecutionCounter::clippedThreshold(jit.codeBlock()->globalObject(), targetValue);
break;
case JITCode::FTLJIT:
clippedValue = UpperTierExecutionCounter::clippedThreshold(jit.codeBlock()->globalObject(), targetValue);
break;
default:
RELEASE_ASSERT_NOT_REACHED();
#if COMPILER_QUIRK(CONSIDERS_UNREACHABLE_CODE)
clippedValue = 0; // Make some compilers, and mhahnenberg, happy.
#endif
break;
}
jit.store32(AssemblyHelpers::TrustedImm32(-clippedValue), AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecuteCounter()));
jit.store32(AssemblyHelpers::TrustedImm32(activeThreshold), AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecutionActiveThreshold()));
jit.store32(AssemblyHelpers::TrustedImm32(formattedTotalExecutionCount(clippedValue)), AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecutionTotalCount()));
doneAdjusting.link(&jit);
}
void reifyInlinedCallFrames(CCallHelpers& jit, const OSRExitBase& exit)
{
ASSERT(jit.baselineCodeBlock()->jitType() == JITCode::BaselineJIT);
jit.storePtr(AssemblyHelpers::TrustedImmPtr(jit.baselineCodeBlock()), AssemblyHelpers::addressFor((VirtualRegister)JSStack::CodeBlock));
CodeOrigin codeOrigin;
for (codeOrigin = exit.m_codeOrigin; codeOrigin.inlineCallFrame; codeOrigin = codeOrigin.inlineCallFrame->caller) {
InlineCallFrame* inlineCallFrame = codeOrigin.inlineCallFrame;
CodeBlock* baselineCodeBlock = jit.baselineCodeBlockFor(codeOrigin);
CodeBlock* baselineCodeBlockForCaller = jit.baselineCodeBlockFor(inlineCallFrame->caller);
unsigned callBytecodeIndex = inlineCallFrame->caller.bytecodeIndex;
CallLinkInfo& callLinkInfo = baselineCodeBlockForCaller->getCallLinkInfo(callBytecodeIndex);
void* jumpTarget = callLinkInfo.callReturnLocation.executableAddress();
GPRReg callerFrameGPR;
if (inlineCallFrame->caller.inlineCallFrame) {
jit.addPtr(AssemblyHelpers::TrustedImm32(inlineCallFrame->caller.inlineCallFrame->stackOffset * sizeof(EncodedJSValue)), GPRInfo::callFrameRegister, GPRInfo::regT3);
callerFrameGPR = GPRInfo::regT3;
} else
callerFrameGPR = GPRInfo::callFrameRegister;
#if USE(JSVALUE64)
jit.storePtr(AssemblyHelpers::TrustedImmPtr(baselineCodeBlock), AssemblyHelpers::addressFor((VirtualRegister)(inlineCallFrame->stackOffset + JSStack::CodeBlock)));
if (!inlineCallFrame->isClosureCall)
jit.store64(AssemblyHelpers::TrustedImm64(JSValue::encode(JSValue(inlineCallFrame->calleeConstant()->scope()))), AssemblyHelpers::addressFor((VirtualRegister)(inlineCallFrame->stackOffset + JSStack::ScopeChain)));
jit.store64(callerFrameGPR, AssemblyHelpers::addressForByteOffset(inlineCallFrame->callerFrameOffset()));
jit.storePtr(AssemblyHelpers::TrustedImmPtr(jumpTarget), AssemblyHelpers::addressForByteOffset(inlineCallFrame->returnPCOffset()));
uint32_t locationBits = CallFrame::Location::encodeAsBytecodeOffset(codeOrigin.bytecodeIndex);
jit.store32(AssemblyHelpers::TrustedImm32(locationBits), AssemblyHelpers::tagFor((VirtualRegister)(inlineCallFrame->stackOffset + JSStack::ArgumentCount)));
jit.store32(AssemblyHelpers::TrustedImm32(inlineCallFrame->arguments.size()), AssemblyHelpers::payloadFor((VirtualRegister)(inlineCallFrame->stackOffset + JSStack::ArgumentCount)));
if (!inlineCallFrame->isClosureCall)
jit.store64(AssemblyHelpers::TrustedImm64(JSValue::encode(JSValue(inlineCallFrame->calleeConstant()))), AssemblyHelpers::addressFor((VirtualRegister)(inlineCallFrame->stackOffset + JSStack::Callee)));
// Leave the captured arguments in regT3.
if (baselineCodeBlock->usesArguments())
jit.loadPtr(AssemblyHelpers::addressFor(VirtualRegister(inlineCallFrame->stackOffset + unmodifiedArgumentsRegister(baselineCodeBlock->argumentsRegister()).offset())), GPRInfo::regT3);
#else // USE(JSVALUE64) // so this is the 32-bit part
jit.storePtr(AssemblyHelpers::TrustedImmPtr(baselineCodeBlock), AssemblyHelpers::addressFor((VirtualRegister)(inlineCallFrame->stackOffset + JSStack::CodeBlock)));
jit.store32(AssemblyHelpers::TrustedImm32(JSValue::CellTag), AssemblyHelpers::tagFor((VirtualRegister)(inlineCallFrame->stackOffset + JSStack::ScopeChain)));
if (!inlineCallFrame->isClosureCall)
jit.storePtr(AssemblyHelpers::TrustedImmPtr(inlineCallFrame->calleeConstant()->scope()), AssemblyHelpers::payloadFor((VirtualRegister)(inlineCallFrame->stackOffset + JSStack::ScopeChain)));
jit.storePtr(callerFrameGPR, AssemblyHelpers::addressForByteOffset(inlineCallFrame->callerFrameOffset()));
jit.storePtr(AssemblyHelpers::TrustedImmPtr(jumpTarget), AssemblyHelpers::addressForByteOffset(inlineCallFrame->returnPCOffset()));
Instruction* instruction = baselineCodeBlock->instructions().begin() + codeOrigin.bytecodeIndex;
uint32_t locationBits = CallFrame::Location::encodeAsBytecodeInstruction(instruction);
jit.store32(AssemblyHelpers::TrustedImm32(locationBits), AssemblyHelpers::tagFor((VirtualRegister)(inlineCallFrame->stackOffset + JSStack::ArgumentCount)));
jit.store32(AssemblyHelpers::TrustedImm32(inlineCallFrame->arguments.size()), AssemblyHelpers::payloadFor((VirtualRegister)(inlineCallFrame->stackOffset + JSStack::ArgumentCount)));
jit.store32(AssemblyHelpers::TrustedImm32(JSValue::CellTag), AssemblyHelpers::tagFor((VirtualRegister)(inlineCallFrame->stackOffset + JSStack::Callee)));
if (!inlineCallFrame->isClosureCall)
jit.storePtr(AssemblyHelpers::TrustedImmPtr(inlineCallFrame->calleeConstant()), AssemblyHelpers::payloadFor((VirtualRegister)(inlineCallFrame->stackOffset + JSStack::Callee)));
// Leave the captured arguments in regT3.
if (baselineCodeBlock->usesArguments())
jit.loadPtr(AssemblyHelpers::payloadFor(VirtualRegister(inlineCallFrame->stackOffset + unmodifiedArgumentsRegister(baselineCodeBlock->argumentsRegister()).offset())), GPRInfo::regT3);
#endif // USE(JSVALUE64) // ending the #else part, so directly above is the 32-bit part
if (baselineCodeBlock->usesArguments()) {
AssemblyHelpers::Jump noArguments = jit.branchTestPtr(AssemblyHelpers::Zero, GPRInfo::regT3);
jit.addPtr(AssemblyHelpers::TrustedImm32(inlineCallFrame->stackOffset * sizeof(EncodedJSValue)), GPRInfo::callFrameRegister, GPRInfo::regT0);
jit.storePtr(GPRInfo::regT0, AssemblyHelpers::Address(GPRInfo::regT3, Arguments::offsetOfRegisters()));
noArguments.link(&jit);
}
}
#if USE(JSVALUE64)
uint32_t locationBits = CallFrame::Location::encodeAsBytecodeOffset(codeOrigin.bytecodeIndex);
#else
Instruction* instruction = jit.baselineCodeBlock()->instructions().begin() + codeOrigin.bytecodeIndex;
uint32_t locationBits = CallFrame::Location::encodeAsBytecodeInstruction(instruction);
#endif
jit.store32(AssemblyHelpers::TrustedImm32(locationBits), AssemblyHelpers::tagFor((VirtualRegister)(JSStack::ArgumentCount)));
}