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/*
* Copyright (C) 2008-2022 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"
#if ENABLE(JIT)
#include "JIT.h"
#include "BaselineJITRegisters.h"
#include "BytecodeOperandsForCheckpoint.h"
#include "CacheableIdentifierInlines.h"
#include "CallFrameShuffler.h"
#include "CodeBlock.h"
#include "JITInlines.h"
#include "ScratchRegisterAllocator.h"
#include "SetupVarargsFrame.h"
#include "SlowPathCall.h"
#include "StackAlignment.h"
#include "ThunkGenerators.h"
namespace JSC {
void JIT::emit_op_ret(const JSInstruction* currentInstruction)
{
static_assert(noOverlap(returnValueJSR, callFrameRegister));
// Return the result in returnValueGPR (returnValueGPR2/returnValueGPR on 32-bit).
auto bytecode = currentInstruction->as<OpRet>();
emitGetVirtualRegister(bytecode.m_value, returnValueJSR);
emitNakedNearJump(vm().getCTIStub(returnFromBaselineGenerator).code());
}
MacroAssemblerCodeRef<JITThunkPtrTag> JIT::returnFromBaselineGenerator(VM&)
{
CCallHelpers jit;
jit.checkStackPointerAlignment();
jit.emitRestoreCalleeSavesFor(&RegisterAtOffsetList::llintBaselineCalleeSaveRegisters());
jit.emitFunctionEpilogue();
jit.ret();
LinkBuffer patchBuffer(jit, GLOBAL_THUNK_ID, LinkBuffer::Profile::ExtraCTIThunk);
return FINALIZE_THUNK(patchBuffer, JITThunkPtrTag, "Baseline: op_ret_handler");
}
template<typename Op>
void JIT::emitPutCallResult(const Op& bytecode)
{
emitValueProfilingSite(bytecode, returnValueJSR);
emitPutVirtualRegister(destinationFor(bytecode, m_bytecodeIndex.checkpoint()).virtualRegister(), returnValueJSR);
}
template<typename Op>
std::enable_if_t<
Op::opcodeID != op_call_varargs && Op::opcodeID != op_construct_varargs
&& Op::opcodeID != op_tail_call_varargs && Op::opcodeID != op_tail_call_forward_arguments
, void>
JIT::compileSetupFrame(const Op& bytecode)
{
unsigned checkpoint = m_bytecodeIndex.checkpoint();
int argCountIncludingThis = argumentCountIncludingThisFor(bytecode, checkpoint);
int registerOffset = -static_cast<int>(stackOffsetInRegistersForCall(bytecode, checkpoint));
if (Op::opcodeID == op_call && shouldEmitProfiling()) {
constexpr JSValueRegs tmpJSR = returnValueJSR;
constexpr GPRReg tmpGPR = tmpJSR.payloadGPR();
emitGetVirtualRegister(VirtualRegister(registerOffset + CallFrame::argumentOffsetIncludingThis(0)), tmpJSR);
Jump done = branchIfNotCell(tmpJSR);
load32(Address(tmpJSR.payloadGPR(), JSCell::structureIDOffset()), tmpGPR);
store32ToMetadata(tmpGPR, bytecode, Op::Metadata::offsetOfArrayProfile() + ArrayProfile::offsetOfLastSeenStructureID());
done.link(this);
}
addPtr(TrustedImm32(registerOffset * sizeof(Register) + sizeof(CallerFrameAndPC)), callFrameRegister, stackPointerRegister);
store32(TrustedImm32(argCountIncludingThis), Address(stackPointerRegister, CallFrameSlot::argumentCountIncludingThis * static_cast<int>(sizeof(Register)) + PayloadOffset - sizeof(CallerFrameAndPC)));
}
template<typename Op>
std::enable_if_t<
Op::opcodeID == op_call_varargs || Op::opcodeID == op_construct_varargs
|| Op::opcodeID == op_tail_call_varargs || Op::opcodeID == op_tail_call_forward_arguments
, void>
JIT::compileSetupFrame(const Op& bytecode)
{
VirtualRegister thisValue = bytecode.m_thisValue;
VirtualRegister arguments = bytecode.m_arguments;
int firstFreeRegister = bytecode.m_firstFree.offset(); // FIXME: Why is this a virtual register if we never use it as one...
int firstVarArgOffset = bytecode.m_firstVarArg;
{
constexpr GPRReg globalObjectGPR = preferredArgumentGPR<Z_JITOperation_GJZZ, 0>();
constexpr JSValueRegs argumentsJSR = preferredArgumentJSR<Z_JITOperation_GJZZ, 1>();
Z_JITOperation_GJZZ sizeOperation;
if (Op::opcodeID == op_tail_call_forward_arguments)
sizeOperation = operationSizeFrameForForwardArguments;
else
sizeOperation = operationSizeFrameForVarargs;
loadGlobalObject(globalObjectGPR);
emitGetVirtualRegister(arguments, argumentsJSR);
callOperation(sizeOperation, globalObjectGPR, argumentsJSR, -firstFreeRegister, firstVarArgOffset);
move(TrustedImm32(-firstFreeRegister), regT1);
emitSetVarargsFrame(*this, returnValueGPR, false, regT1, regT1);
}
#if USE(JSVALUE64)
addPtr(TrustedImm32(-(sizeof(CallerFrameAndPC) + WTF::roundUpToMultipleOf(stackAlignmentBytes(), 5 * sizeof(void*)))), regT1, stackPointerRegister);
#elif USE(JSVALUE32_64)
addPtr(TrustedImm32(-(sizeof(CallerFrameAndPC) + WTF::roundUpToMultipleOf(stackAlignmentBytes(), 6 * sizeof(void*)))), regT1, stackPointerRegister);
#endif
{
emitGetVirtualRegister(arguments, jsRegT32);
F_JITOperation_GFJZZ setupOperation;
if (Op::opcodeID == op_tail_call_forward_arguments)
setupOperation = operationSetupForwardArgumentsFrame;
else
setupOperation = operationSetupVarargsFrame;
loadGlobalObject(regT4);
callOperation(setupOperation, regT4, regT1, jsRegT32, firstVarArgOffset, regT0);
move(returnValueGPR, regT5);
}
// Profile the argument count.
load32(Address(regT5, CallFrameSlot::argumentCountIncludingThis * static_cast<int>(sizeof(Register)) + PayloadOffset), regT2);
materializePointerIntoMetadata(bytecode, Op::Metadata::offsetOfCallLinkInfo(), regT0);
load32(Address(regT0, CallLinkInfo::offsetOfMaxArgumentCountIncludingThis()), regT3);
Jump notBiggest = branch32(Above, regT3, regT2);
store32(regT2, Address(regT0, CallLinkInfo::offsetOfMaxArgumentCountIncludingThis()));
notBiggest.link(this);
// Initialize 'this'.
constexpr JSValueRegs thisJSR = jsRegT10;
emitGetVirtualRegister(thisValue, thisJSR);
storeValue(thisJSR, Address(regT5, CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register))));
addPtr(TrustedImm32(sizeof(CallerFrameAndPC)), regT5, stackPointerRegister);
}
template<typename Op>
bool JIT::compileCallEval(const Op&)
{
return false;
}
template<>
bool JIT::compileCallEval(const OpCallEval& bytecode)
{
addPtr(TrustedImm32(-static_cast<ptrdiff_t>(sizeof(CallerFrameAndPC))), stackPointerRegister, argumentGPR1);
storePtr(callFrameRegister, Address(argumentGPR1, CallFrame::callerFrameOffset()));
resetSP();
move(TrustedImm32(bytecode.m_ecmaMode.value()), argumentGPR2);
loadGlobalObject(argumentGPR0);
callOperation(operationCallEval, argumentGPR0, argumentGPR1, argumentGPR2);
addSlowCase(branchIfEmpty(returnValueJSR));
setFastPathResumePoint();
emitPutCallResult(bytecode);
return true;
}
void JIT::compileCallEvalSlowCase(const JSInstruction* instruction, Vector<SlowCaseEntry>::iterator& iter)
{
linkAllSlowCases(iter);
auto bytecode = instruction->as<OpCallEval>();
int registerOffset = -bytecode.m_argv;
addPtr(TrustedImm32(registerOffset * sizeof(Register) + sizeof(CallerFrameAndPC)), callFrameRegister, stackPointerRegister);
static_assert(noOverlap(BaselineJITRegisters::Call::calleeJSR, BaselineJITRegisters::Call::callLinkInfoGPR, regT3));
loadValue(Address(stackPointerRegister, sizeof(Register) * CallFrameSlot::callee - sizeof(CallerFrameAndPC)), BaselineJITRegisters::Call::calleeJSR);
loadGlobalObject(regT3);
materializePointerIntoMetadata(bytecode, OpCallEval::Metadata::offsetOfCallLinkInfo(), BaselineJITRegisters::Call::callLinkInfoGPR);
emitVirtualCallWithoutMovingGlobalObject(*m_vm, BaselineJITRegisters::Call::callLinkInfoGPR, CallMode::Regular);
resetSP();
}
template<typename Op>
bool JIT::compileTailCall(const Op&, UnlinkedCallLinkInfo*, unsigned)
{
return false;
}
template<>
bool JIT::compileTailCall(const OpTailCall& bytecode, UnlinkedCallLinkInfo*, unsigned callLinkInfoIndex)
{
materializePointerIntoMetadata(bytecode, OpTailCall::Metadata::offsetOfCallLinkInfo(), BaselineJITRegisters::Call::callLinkInfoGPR);
JumpList slowPaths = CallLinkInfo::emitTailCallDataICFastPath(*this, BaselineJITRegisters::Call::calleeJSR.payloadGPR(), BaselineJITRegisters::Call::callLinkInfoGPR, scopedLambda<void()>([&] {
CallFrameShuffleData shuffleData = CallFrameShuffleData::createForBaselineOrLLIntTailCall(bytecode, m_unlinkedCodeBlock->numParameters());
CallFrameShuffler shuffler { *this, shuffleData };
shuffler.lockGPR(BaselineJITRegisters::Call::callLinkInfoGPR);
shuffler.prepareForTailCall();
}));
addSlowCase(slowPaths);
auto doneLocation = label();
m_callCompilationInfo[callLinkInfoIndex].doneLocation = doneLocation;
return true;
}
template<typename Op>
void JIT::compileOpCall(const JSInstruction* instruction, unsigned callLinkInfoIndex)
{
OpcodeID opcodeID = Op::opcodeID;
auto bytecode = instruction->as<Op>();
VirtualRegister callee = calleeFor(bytecode, m_bytecodeIndex.checkpoint());
/* Caller always:
- Updates callFrameRegister to callee callFrame.
- Initializes ArgumentCount; CallerFrame; Callee.
For a JS call:
- Callee initializes ReturnPC; CodeBlock.
- Callee restores callFrameRegister before return.
For a non-JS call:
- Caller initializes ReturnPC; CodeBlock.
- Caller restores callFrameRegister after return.
*/
UnlinkedCallLinkInfo* info = nullptr;
if (opcodeID != op_call_eval) {
info = addUnlinkedCallLinkInfo();
info->bytecodeIndex = m_bytecodeIndex;
ASSERT(m_callCompilationInfo.size() == callLinkInfoIndex);
m_callCompilationInfo.append(CallCompilationInfo());
m_callCompilationInfo[callLinkInfoIndex].unlinkedCallLinkInfo = info;
}
compileSetupFrame(bytecode);
// SP holds newCallFrame + sizeof(CallerFrameAndPC), with ArgumentCount initialized.
uint32_t locationBits = CallSiteIndex(m_bytecodeIndex).bits();
store32(TrustedImm32(locationBits), Address(callFrameRegister, CallFrameSlot::argumentCountIncludingThis * static_cast<int>(sizeof(Register)) + TagOffset));
emitGetVirtualRegister(callee, BaselineJITRegisters::Call::calleeJSR);
storeValue(BaselineJITRegisters::Call::calleeJSR, Address(stackPointerRegister, CallFrameSlot::callee * static_cast<int>(sizeof(Register)) - sizeof(CallerFrameAndPC)));
if (compileCallEval(bytecode))
return;
#if USE(JSVALUE32_64)
// We need this on JSVALUE32_64 only as on JSVALUE64 a pointer comparison in the DataIC fast
// path catches this.
addSlowCase(branchIfNotCell(BaselineJITRegisters::Call::calleeJSR));
#endif
if (compileTailCall(bytecode, info, callLinkInfoIndex))
return;
materializePointerIntoMetadata(bytecode, Op::Metadata::offsetOfCallLinkInfo(), BaselineJITRegisters::Call::callLinkInfoGPR);
if (opcodeID == op_tail_call_varargs || opcodeID == op_tail_call_forward_arguments) {
auto slowPaths = CallLinkInfo::emitTailCallDataICFastPath(*this, BaselineJITRegisters::Call::calleeJSR.payloadGPR(), BaselineJITRegisters::Call::callLinkInfoGPR, scopedLambda<void()>([&] {
emitRestoreCalleeSaves();
prepareForTailCallSlow(BaselineJITRegisters::Call::callLinkInfoGPR);
}));
addSlowCase(slowPaths);
auto doneLocation = label();
m_callCompilationInfo[callLinkInfoIndex].doneLocation = doneLocation;
return;
}
auto slowPaths = CallLinkInfo::emitDataICFastPath(*this, BaselineJITRegisters::Call::calleeJSR.payloadGPR(), BaselineJITRegisters::Call::callLinkInfoGPR);
auto doneLocation = label();
addSlowCase(slowPaths);
m_callCompilationInfo[callLinkInfoIndex].doneLocation = doneLocation;
if constexpr (Op::opcodeID != op_iterator_open && Op::opcodeID != op_iterator_next)
setFastPathResumePoint();
resetSP();
emitPutCallResult(bytecode);
}
template<typename Op>
void JIT::compileOpCallSlowCase(const JSInstruction* instruction, Vector<SlowCaseEntry>::iterator& iter, unsigned)
{
OpcodeID opcodeID = Op::opcodeID;
auto bytecode = instruction->as<Op>();
ASSERT(opcodeID != op_call_eval);
linkAllSlowCases(iter);
loadGlobalObject(regT3);
materializePointerIntoMetadata(bytecode, Op::Metadata::offsetOfCallLinkInfo(), regT2);
if (opcodeID == op_tail_call || opcodeID == op_tail_call_varargs || opcodeID == op_tail_call_forward_arguments)
emitRestoreCalleeSaves();
CallLinkInfo::emitDataICSlowPath(*m_vm, *this, regT2);
if (opcodeID == op_tail_call || opcodeID == op_tail_call_varargs || opcodeID == op_tail_call_forward_arguments) {
abortWithReason(JITDidReturnFromTailCall);
return;
}
}
void JIT::emit_op_call(const JSInstruction* currentInstruction)
{
compileOpCall<OpCall>(currentInstruction, m_callLinkInfoIndex++);
}
void JIT::emit_op_tail_call(const JSInstruction* currentInstruction)
{
compileOpCall<OpTailCall>(currentInstruction, m_callLinkInfoIndex++);
}
void JIT::emit_op_call_eval(const JSInstruction* currentInstruction)
{
compileOpCall<OpCallEval>(currentInstruction, m_callLinkInfoIndex);
}
void JIT::emit_op_call_varargs(const JSInstruction* currentInstruction)
{
compileOpCall<OpCallVarargs>(currentInstruction, m_callLinkInfoIndex++);
}
void JIT::emit_op_tail_call_varargs(const JSInstruction* currentInstruction)
{
compileOpCall<OpTailCallVarargs>(currentInstruction, m_callLinkInfoIndex++);
}
void JIT::emit_op_tail_call_forward_arguments(const JSInstruction* currentInstruction)
{
compileOpCall<OpTailCallForwardArguments>(currentInstruction, m_callLinkInfoIndex++);
}
void JIT::emit_op_construct_varargs(const JSInstruction* currentInstruction)
{
compileOpCall<OpConstructVarargs>(currentInstruction, m_callLinkInfoIndex++);
}
void JIT::emit_op_construct(const JSInstruction* currentInstruction)
{
compileOpCall<OpConstruct>(currentInstruction, m_callLinkInfoIndex++);
}
void JIT::emitSlow_op_call(const JSInstruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
compileOpCallSlowCase<OpCall>(currentInstruction, iter, m_callLinkInfoIndex++);
}
void JIT::emitSlow_op_tail_call(const JSInstruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
compileOpCallSlowCase<OpTailCall>(currentInstruction, iter, m_callLinkInfoIndex++);
}
void JIT::emitSlow_op_call_eval(const JSInstruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
compileCallEvalSlowCase(currentInstruction, iter);
}
void JIT::emitSlow_op_call_varargs(const JSInstruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
compileOpCallSlowCase<OpCallVarargs>(currentInstruction, iter, m_callLinkInfoIndex++);
}
void JIT::emitSlow_op_tail_call_varargs(const JSInstruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
compileOpCallSlowCase<OpTailCallVarargs>(currentInstruction, iter, m_callLinkInfoIndex++);
}
void JIT::emitSlow_op_tail_call_forward_arguments(const JSInstruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
compileOpCallSlowCase<OpTailCallForwardArguments>(currentInstruction, iter, m_callLinkInfoIndex++);
}
void JIT::emitSlow_op_construct_varargs(const JSInstruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
compileOpCallSlowCase<OpConstructVarargs>(currentInstruction, iter, m_callLinkInfoIndex++);
}
void JIT::emitSlow_op_construct(const JSInstruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
compileOpCallSlowCase<OpConstruct>(currentInstruction, iter, m_callLinkInfoIndex++);
}
void JIT::emit_op_iterator_open(const JSInstruction* instruction)
{
auto bytecode = instruction->as<OpIteratorOpen>();
auto* tryFastFunction = ([&] () {
switch (instruction->width()) {
case Narrow: return iterator_open_try_fast_narrow;
case Wide16: return iterator_open_try_fast_wide16;
case Wide32: return iterator_open_try_fast_wide32;
default: RELEASE_ASSERT_NOT_REACHED();
}
})();
JITSlowPathCall slowPathCall(this, tryFastFunction);
slowPathCall.call();
Jump fastCase = branch32(NotEqual, GPRInfo::returnValueGPR2, TrustedImm32(static_cast<uint32_t>(IterationMode::Generic)));
compileOpCall<OpIteratorOpen>(instruction, m_callLinkInfoIndex++);
advanceToNextCheckpoint();
// call result (iterator) is in returnValueJSR
emitJumpSlowCaseIfNotJSCell(returnValueJSR);
using BaselineJITRegisters::GetById::baseJSR;
using BaselineJITRegisters::GetById::resultJSR;
using BaselineJITRegisters::GetById::FastPath::stubInfoGPR;
static_assert(noOverlap(returnValueJSR, stubInfoGPR));
static_assert(returnValueJSR == baseJSR); // Otherwise will need move(returnValueJSR, baseJSR)
static_assert(baseJSR == resultJSR);
const Identifier* ident = &vm().propertyNames->next;
auto [ stubInfo, stubInfoIndex ] = addUnlinkedStructureStubInfo();
JITGetByIdGenerator gen(
nullptr, stubInfo, JITType::BaselineJIT, CodeOrigin(m_bytecodeIndex), CallSiteIndex(BytecodeIndex(m_bytecodeIndex.offset())), RegisterSet::stubUnavailableRegisters(),
CacheableIdentifier::createFromImmortalIdentifier(ident->impl()), baseJSR, resultJSR, stubInfoGPR, AccessType::GetById);
gen.m_unlinkedStubInfoConstantIndex = stubInfoIndex;
gen.generateBaselineDataICFastPath(*this, stubInfoIndex, stubInfoGPR);
resetSP(); // We might OSR exit here, so we need to conservatively reset SP
addSlowCase();
m_getByIds.append(gen);
emitValueProfilingSite(bytecode, resultJSR);
emitPutVirtualRegister(bytecode.m_next, resultJSR);
fastCase.link(this);
}
void JIT::emitSlow_op_iterator_open(const JSInstruction* instruction, Vector<SlowCaseEntry>::iterator& iter)
{
auto bytecode = instruction->as<OpIteratorOpen>();
linkAllSlowCases(iter);
compileOpCallSlowCase<OpIteratorOpen>(instruction, iter, m_callLinkInfoIndex++);
resetSP();
emitPutCallResult(bytecode);
emitJumpSlowToHotForCheckpoint(jump());
linkAllSlowCases(iter);
JSValueRegs iteratorJSR = BaselineJITRegisters::GetById::baseJSR;
JumpList notObject;
notObject.append(branchIfNotCell(iteratorJSR));
notObject.append(branchIfNotObject(iteratorJSR.payloadGPR()));
VirtualRegister nextVReg = bytecode.m_next;
UniquedStringImpl* ident = vm().propertyNames->next.impl();
JITGetByIdGenerator& gen = m_getByIds[m_getByIdIndex++];
Label coldPathBegin = label();
using SlowOperation = decltype(operationGetByIdOptimize);
constexpr GPRReg globalObjectGPR = preferredArgumentGPR<SlowOperation, 0>();
constexpr GPRReg stubInfoGPR = preferredArgumentGPR<SlowOperation, 1>();
constexpr JSValueRegs arg2JSR = preferredArgumentJSR<SlowOperation, 2>();
moveValueRegs(iteratorJSR, arg2JSR);
loadGlobalObject(globalObjectGPR);
loadConstant(gen.m_unlinkedStubInfoConstantIndex, stubInfoGPR);
callOperationWithProfile<SlowOperation>(
bytecode,
Address(stubInfoGPR, StructureStubInfo::offsetOfSlowOperation()),
nextVReg,
globalObjectGPR, stubInfoGPR, arg2JSR,
CacheableIdentifier::createFromImmortalIdentifier(ident).rawBits());
gen.reportSlowPathCall(coldPathBegin, Call());
auto done = jump();
notObject.link(this);
loadGlobalObject(argumentGPR0);
callOperation(operationThrowIteratorResultIsNotObject, argumentGPR0);
done.link(this);
}
void JIT::emit_op_iterator_next(const JSInstruction* instruction)
{
auto bytecode = instruction->as<OpIteratorNext>();
auto* tryFastFunction = ([&] () {
switch (instruction->width()) {
case Narrow: return iterator_next_try_fast_narrow;
case Wide16: return iterator_next_try_fast_wide16;
case Wide32: return iterator_next_try_fast_wide32;
default: RELEASE_ASSERT_NOT_REACHED();
}
})();
using BaselineJITRegisters::GetById::baseJSR;
using BaselineJITRegisters::GetById::resultJSR;
using BaselineJITRegisters::GetById::FastPath::dontClobberJSR;
using BaselineJITRegisters::GetById::FastPath::stubInfoGPR;
constexpr JSValueRegs nextJSR = baseJSR; // Used as temporary register
emitGetVirtualRegister(bytecode.m_next, nextJSR);
Jump genericCase = branchIfNotEmpty(nextJSR);
JITSlowPathCall slowPathCall(this, tryFastFunction);
slowPathCall.call();
Jump fastCase = branch32(NotEqual, GPRInfo::returnValueGPR2, TrustedImm32(static_cast<uint32_t>(IterationMode::Generic)));
genericCase.link(this);
load8FromMetadata(bytecode, OpIteratorNext::Metadata::offsetOfIterationMetadata() + IterationModeMetadata::offsetOfSeenModes(), regT0);
or32(TrustedImm32(static_cast<uint8_t>(IterationMode::Generic)), regT0);
store8ToMetadata(regT0, bytecode, OpIteratorNext::Metadata::offsetOfIterationMetadata() + IterationModeMetadata::offsetOfSeenModes());
compileOpCall<OpIteratorNext>(instruction, m_callLinkInfoIndex++);
advanceToNextCheckpoint();
// call result ({ done, value } JSObject) in regT0 (regT1/regT0 or 32-bit)
static_assert(noOverlap(resultJSR, stubInfoGPR));
constexpr JSValueRegs iterCallResultJSR = dontClobberJSR;
moveValueRegs(returnValueJSR, iterCallResultJSR);
constexpr JSValueRegs doneJSR = resultJSR;
{
emitJumpSlowCaseIfNotJSCell(returnValueJSR);
RegisterSet preservedRegs = RegisterSet::stubUnavailableRegisters();
preservedRegs.set(iterCallResultJSR);
auto [ stubInfo, stubInfoIndex ] = addUnlinkedStructureStubInfo();
JITGetByIdGenerator gen(
nullptr, stubInfo, JITType::BaselineJIT, CodeOrigin(m_bytecodeIndex), CallSiteIndex(BytecodeIndex(m_bytecodeIndex.offset())), preservedRegs,
CacheableIdentifier::createFromImmortalIdentifier(vm().propertyNames->done.impl()), returnValueJSR, doneJSR, stubInfoGPR, AccessType::GetById);
gen.m_unlinkedStubInfoConstantIndex = stubInfoIndex;
gen.generateBaselineDataICFastPath(*this, stubInfoIndex, stubInfoGPR);
resetSP(); // We might OSR exit here, so we need to conservatively reset SP
addSlowCase();
m_getByIds.append(gen);
emitValueProfilingSite(bytecode, doneJSR);
emitPutVirtualRegister(bytecode.m_done, doneJSR);
advanceToNextCheckpoint();
}
{
RegisterSet usedRegisters(doneJSR, iterCallResultJSR);
ScratchRegisterAllocator scratchAllocator(usedRegisters);
GPRReg scratch1 = scratchAllocator.allocateScratchGPR();
GPRReg scratch2 = scratchAllocator.allocateScratchGPR();
GPRReg globalGPR = scratchAllocator.allocateScratchGPR();
const bool shouldCheckMasqueradesAsUndefined = false;
loadGlobalObject(globalGPR);
JumpList iterationDone = branchIfTruthy(vm(), doneJSR, scratch1, scratch2, fpRegT0, fpRegT1, shouldCheckMasqueradesAsUndefined, globalGPR);
moveValueRegs(iterCallResultJSR, baseJSR);
auto [ stubInfo, stubInfoIndex ] = addUnlinkedStructureStubInfo();
JITGetByIdGenerator gen(
nullptr, stubInfo, JITType::BaselineJIT, CodeOrigin(m_bytecodeIndex), CallSiteIndex(BytecodeIndex(m_bytecodeIndex.offset())), RegisterSet::stubUnavailableRegisters(),
CacheableIdentifier::createFromImmortalIdentifier(vm().propertyNames->value.impl()), baseJSR, resultJSR, stubInfoGPR, AccessType::GetById);
gen.m_unlinkedStubInfoConstantIndex = stubInfoIndex;
gen.generateBaselineDataICFastPath(*this, stubInfoIndex, stubInfoGPR);
resetSP(); // We might OSR exit here, so we need to conservatively reset SP
addSlowCase();
m_getByIds.append(gen);
emitValueProfilingSite(bytecode, resultJSR);
emitPutVirtualRegister(bytecode.m_value, resultJSR);
iterationDone.link(this);
}
fastCase.link(this);
}
void JIT::emitSlow_op_iterator_next(const JSInstruction* instruction, Vector<SlowCaseEntry>::iterator& iter)
{
auto bytecode = instruction->as<OpIteratorNext>();
linkAllSlowCases(iter);
compileOpCallSlowCase<OpIteratorNext>(instruction, iter, m_callLinkInfoIndex++);
resetSP();
emitPutCallResult(bytecode);
emitJumpSlowToHotForCheckpoint(jump());
using BaselineJITRegisters::GetById::resultJSR;
using BaselineJITRegisters::GetById::FastPath::dontClobberJSR;
constexpr JSValueRegs iterCallResultJSR = dontClobberJSR;
{
VirtualRegister doneVReg = bytecode.m_done;
linkAllSlowCases(iter);
JumpList notObject;
notObject.append(branchIfNotCell(iterCallResultJSR));
UniquedStringImpl* ident = vm().propertyNames->done.impl();
JITGetByIdGenerator& gen = m_getByIds[m_getByIdIndex++];
Label coldPathBegin = label();
notObject.append(branchIfNotObject(iterCallResultJSR.payloadGPR()));
using SlowOperation = decltype(operationGetByIdOptimize);
constexpr GPRReg globalObjectGPR = preferredArgumentGPR<SlowOperation, 0>();
constexpr GPRReg stubInfoGPR = preferredArgumentGPR<SlowOperation, 1>();
constexpr JSValueRegs arg2JSR = preferredArgumentJSR<SlowOperation, 2>();
moveValueRegs(iterCallResultJSR, arg2JSR);
loadGlobalObject(globalObjectGPR);
loadConstant(gen.m_unlinkedStubInfoConstantIndex, stubInfoGPR);
callOperationWithProfile<SlowOperation>(
bytecode,
Address(stubInfoGPR, StructureStubInfo::offsetOfSlowOperation()),
doneVReg,
globalObjectGPR, stubInfoGPR, arg2JSR,
CacheableIdentifier::createFromImmortalIdentifier(ident).rawBits());
gen.reportSlowPathCall(coldPathBegin, Call());
constexpr JSValueRegs doneJSR = resultJSR;
emitGetVirtualRegister(doneVReg, doneJSR);
emitGetVirtualRegister(bytecode.m_value, iterCallResultJSR);
emitJumpSlowToHotForCheckpoint(jump());
notObject.link(this);
loadGlobalObject(argumentGPR0);
callOperation(operationThrowIteratorResultIsNotObject, argumentGPR0);
}
{
linkAllSlowCases(iter);
VirtualRegister valueVReg = bytecode.m_value;
UniquedStringImpl* ident = vm().propertyNames->value.impl();
JITGetByIdGenerator& gen = m_getByIds[m_getByIdIndex++];
Label coldPathBegin = label();
using SlowOperation = decltype(operationGetByIdOptimize);
constexpr GPRReg globalObjectGPR = preferredArgumentGPR<SlowOperation, 0>();
constexpr GPRReg stubInfoGPR = preferredArgumentGPR<SlowOperation, 1>();
constexpr JSValueRegs arg2JSR = preferredArgumentJSR<SlowOperation, 2>();
moveValueRegs(iterCallResultJSR, arg2JSR);
loadGlobalObject(globalObjectGPR);
loadConstant(gen.m_unlinkedStubInfoConstantIndex, stubInfoGPR);
callOperationWithProfile<decltype(operationGetByIdOptimize)>(
bytecode,
Address(stubInfoGPR, StructureStubInfo::offsetOfSlowOperation()),
valueVReg,
globalObjectGPR, stubInfoGPR, arg2JSR,
CacheableIdentifier::createFromImmortalIdentifier(ident).rawBits());
gen.reportSlowPathCall(coldPathBegin, Call());
}
}
} // namespace JSC
#endif // ENABLE(JIT)