void JIT::emit_op_ret_object_or_this(Instruction* currentInstruction)
{
unsigned result = currentInstruction[1].u.operand;
unsigned thisReg = currentInstruction[2].u.operand;
// We could JIT generate the deref, only calling out to C when the refcount hits zero.
if (m_codeBlock->needsFullScopeChain())
JITStubCall(this, cti_op_ret_scopeChain).call();
emitLoad(result, regT1, regT0);
Jump notJSCell = branch32(NotEqual, regT1, Imm32(JSValue::CellTag));
loadPtr(Address(regT0, OBJECT_OFFSETOF(JSCell, m_structure)), regT2);
Jump notObject = branch8(NotEqual, Address(regT2, OBJECT_OFFSETOF(Structure, m_typeInfo) + OBJECT_OFFSETOF(TypeInfo, m_type)), Imm32(ObjectType));
emitGetFromCallFrameHeaderPtr(RegisterFile::ReturnPC, regT2);
emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, callFrameRegister);
restoreReturnAddressBeforeReturn(regT2);
ret();
notJSCell.link(this);
notObject.link(this);
emitLoad(thisReg, regT1, regT0);
emitGetFromCallFrameHeaderPtr(RegisterFile::ReturnPC, regT2);
emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, callFrameRegister);
restoreReturnAddressBeforeReturn(regT2);
ret();
}
void JIT::compileSetupVarargsFrame(Instruction* instruction, CallLinkInfo* info)
{
int thisValue = instruction[3].u.operand;
int arguments = instruction[4].u.operand;
int firstFreeRegister = instruction[5].u.operand;
int firstVarArgOffset = instruction[6].u.operand;
emitLoad(arguments, regT1, regT0);
callOperation(operationSizeFrameForVarargs, regT1, regT0, -firstFreeRegister, firstVarArgOffset);
move(TrustedImm32(-firstFreeRegister), regT1);
emitSetVarargsFrame(*this, returnValueGPR, false, regT1, regT1);
addPtr(TrustedImm32(-(sizeof(CallerFrameAndPC) + WTF::roundUpToMultipleOf(stackAlignmentBytes(), 6 * sizeof(void*)))), regT1, stackPointerRegister);
emitLoad(arguments, regT2, regT4);
callOperation(operationSetupVarargsFrame, regT1, regT2, regT4, firstVarArgOffset, regT0);
move(returnValueGPR, regT1);
// Profile the argument count.
load32(Address(regT1, JSStack::ArgumentCount * static_cast<int>(sizeof(Register)) + PayloadOffset), regT2);
load8(info->addressOfMaxNumArguments(), regT0);
Jump notBiggest = branch32(Above, regT0, regT2);
Jump notSaturated = branch32(BelowOrEqual, regT2, TrustedImm32(255));
move(TrustedImm32(255), regT2);
notSaturated.link(this);
store8(regT2, info->addressOfMaxNumArguments());
notBiggest.link(this);
// Initialize 'this'.
emitLoad(thisValue, regT2, regT0);
store32(regT0, Address(regT1, PayloadOffset + (CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
store32(regT2, Address(regT1, TagOffset + (CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
addPtr(TrustedImm32(sizeof(CallerFrameAndPC)), regT1, stackPointerRegister);
}
void JIT::emit_op_ret_object_or_this(Instruction* currentInstruction)
{
unsigned result = currentInstruction[1].u.operand;
unsigned thisReg = currentInstruction[2].u.operand;
emitLoad(result, regT1, regT0);
Jump notJSCell = branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag));
loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
Jump notObject = emitJumpIfNotObject(regT2);
emitGetFromCallFrameHeaderPtr(JSStack::ReturnPC, regT2);
emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, callFrameRegister);
restoreReturnAddressBeforeReturn(regT2);
ret();
notJSCell.link(this);
notObject.link(this);
emitLoad(thisReg, regT1, regT0);
emitGetFromCallFrameHeaderPtr(JSStack::ReturnPC, regT2);
emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, callFrameRegister);
restoreReturnAddressBeforeReturn(regT2);
ret();
}
void JIT::compileOpCall(OpcodeID opcodeID, Instruction* instruction, unsigned)
{
int callee = instruction[1].u.operand;
int argCount = instruction[2].u.operand;
int registerOffset = instruction[3].u.operand;
Jump wasEval;
if (opcodeID == op_call_eval) {
JITStubCall stubCall(this, cti_op_call_eval);
stubCall.addArgument(callee);
stubCall.addArgument(JIT::Imm32(registerOffset));
stubCall.addArgument(JIT::Imm32(argCount));
stubCall.call();
wasEval = branch32(NotEqual, regT1, TrustedImm32(JSValue::EmptyValueTag));
}
emitLoad(callee, regT1, regT0);
emitJumpSlowCaseIfNotJSCell(callee, regT1);
addSlowCase(branchPtr(NotEqual, Address(regT0), TrustedImmPtr(m_globalData->jsFunctionVPtr)));
// Speculatively roll the callframe, assuming argCount will match the arity.
store32(TrustedImm32(JSValue::CellTag), tagFor(RegisterFile::CallerFrame + registerOffset, callFrameRegister));
storePtr(callFrameRegister, payloadFor(RegisterFile::CallerFrame + registerOffset, callFrameRegister));
addPtr(Imm32(registerOffset * static_cast<int>(sizeof(Register))), callFrameRegister);
move(TrustedImm32(argCount), regT1);
emitNakedCall(opcodeID == op_construct ? m_globalData->jitStubs->ctiVirtualConstruct() : m_globalData->jitStubs->ctiVirtualCall());
if (opcodeID == op_call_eval)
wasEval.link(this);
sampleCodeBlock(m_codeBlock);
}
void JIT::compileOpCallVarargs(Instruction* instruction)
{
int callee = instruction[1].u.operand;
int argCountRegister = instruction[2].u.operand;
int registerOffset = instruction[3].u.operand;
emitLoad(callee, regT1, regT0);
emitLoadPayload(argCountRegister, regT2); // argCount
addPtr(Imm32(registerOffset), regT2, regT3); // registerOffset
emitJumpSlowCaseIfNotJSCell(callee, regT1);
addSlowCase(branchPtr(NotEqual, Address(regT0), TrustedImmPtr(m_globalData->jsFunctionVPtr)));
// Speculatively roll the callframe, assuming argCount will match the arity.
mul32(TrustedImm32(sizeof(Register)), regT3, regT3);
addPtr(callFrameRegister, regT3);
store32(TrustedImm32(JSValue::CellTag), tagFor(RegisterFile::CallerFrame, regT3));
storePtr(callFrameRegister, payloadFor(RegisterFile::CallerFrame, regT3));
move(regT3, callFrameRegister);
move(regT2, regT1); // argCount
emitNakedCall(m_globalData->jitStubs->ctiVirtualCall());
sampleCodeBlock(m_codeBlock);
}
void JIT::compileCallEvalSlowCase(Instruction* instruction, Vector<SlowCaseEntry>::iterator& iter)
{
CallLinkInfo* info = m_codeBlock->addCallLinkInfo();
info->setUpCall(CallLinkInfo::Call, CodeOrigin(m_bytecodeOffset), regT0);
linkSlowCase(iter);
int registerOffset = -instruction[4].u.operand;
addPtr(TrustedImm32(registerOffset * sizeof(Register) + sizeof(CallerFrameAndPC)), callFrameRegister, stackPointerRegister);
loadPtr(Address(stackPointerRegister, sizeof(Register) * JSStack::Callee - sizeof(CallerFrameAndPC)), regT0);
loadPtr(Address(stackPointerRegister, sizeof(Register) * JSStack::Callee - sizeof(CallerFrameAndPC)), regT1);
move(TrustedImmPtr(info), regT2);
emitLoad(JSStack::Callee, regT1, regT0);
MacroAssemblerCodeRef virtualThunk = virtualThunkFor(m_vm, *info);
info->setSlowStub(createJITStubRoutine(virtualThunk, *m_vm, nullptr, true));
emitNakedCall(virtualThunk.code());
addPtr(TrustedImm32(stackPointerOffsetFor(m_codeBlock) * sizeof(Register)), callFrameRegister, stackPointerRegister);
checkStackPointerAlignment();
sampleCodeBlock(m_codeBlock);
emitPutCallResult(instruction);
}
void JIT::compileOpCall(OpcodeID opcodeID, Instruction* instruction, unsigned callLinkInfoIndex)
{
int callee = instruction[1].u.operand;
/* Caller always:
- Updates callFrameRegister to callee callFrame.
- Initializes ArgumentCount; CallerFrame; Callee.
For a JS call:
- Caller initializes ScopeChain.
- Callee initializes ReturnPC; CodeBlock.
- Callee restores callFrameRegister before return.
For a non-JS call:
- Caller initializes ScopeChain; ReturnPC; CodeBlock.
- Caller restores callFrameRegister after return.
*/
if (opcodeID == op_call_varargs)
compileLoadVarargs(instruction);
else {
int argCount = instruction[2].u.operand;
int registerOffset = instruction[3].u.operand;
addPtr(TrustedImm32(registerOffset * sizeof(Register)), callFrameRegister, regT3);
store32(TrustedImm32(argCount), payloadFor(RegisterFile::ArgumentCount, regT3));
} // regT3 holds newCallFrame with ArgumentCount initialized.
emitLoad(callee, regT1, regT0); // regT1, regT0 holds callee.
storePtr(callFrameRegister, Address(regT3, RegisterFile::CallerFrame * static_cast<int>(sizeof(Register))));
emitStore(RegisterFile::Callee, regT1, regT0, regT3);
move(regT3, callFrameRegister);
if (opcodeID == op_call_eval) {
compileCallEval();
return;
}
DataLabelPtr addressOfLinkedFunctionCheck;
BEGIN_UNINTERRUPTED_SEQUENCE(sequenceOpCall);
Jump slowCase = branchPtrWithPatch(NotEqual, regT0, addressOfLinkedFunctionCheck, TrustedImmPtr(0));
END_UNINTERRUPTED_SEQUENCE(sequenceOpCall);
addSlowCase(slowCase);
addSlowCase(branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag)));
ASSERT_JIT_OFFSET(differenceBetween(addressOfLinkedFunctionCheck, slowCase), patchOffsetOpCallCompareToJump);
ASSERT(m_callStructureStubCompilationInfo.size() == callLinkInfoIndex);
m_callStructureStubCompilationInfo.append(StructureStubCompilationInfo());
m_callStructureStubCompilationInfo[callLinkInfoIndex].hotPathBegin = addressOfLinkedFunctionCheck;
m_callStructureStubCompilationInfo[callLinkInfoIndex].callType = CallLinkInfo::callTypeFor(opcodeID);
m_callStructureStubCompilationInfo[callLinkInfoIndex].bytecodeIndex = m_bytecodeOffset;
loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_scopeChain)), regT1);
emitPutCellToCallFrameHeader(regT1, RegisterFile::ScopeChain);
m_callStructureStubCompilationInfo[callLinkInfoIndex].hotPathOther = emitNakedCall();
sampleCodeBlock(m_codeBlock);
}
void JIT::compileLoadVarargs(Instruction* instruction)
{
int thisValue = instruction[2].u.operand;
int arguments = instruction[3].u.operand;
int firstFreeRegister = instruction[4].u.operand;
JumpList slowCase;
JumpList end;
if (m_codeBlock->usesArguments() && arguments == m_codeBlock->argumentsRegister()) {
emitLoadTag(arguments, regT1);
slowCase.append(branch32(NotEqual, regT1, TrustedImm32(JSValue::EmptyValueTag)));
load32(payloadFor(RegisterFile::ArgumentCount), regT2);
slowCase.append(branch32(Above, regT2, TrustedImm32(Arguments::MaxArguments + 1)));
// regT2: argumentCountIncludingThis
move(regT2, regT3);
add32(TrustedImm32(firstFreeRegister + RegisterFile::CallFrameHeaderSize), regT3);
lshift32(TrustedImm32(3), regT3);
addPtr(callFrameRegister, regT3);
// regT3: newCallFrame
slowCase.append(branchPtr(Below, AbsoluteAddress(m_globalData->interpreter->registerFile().addressOfEnd()), regT3));
// Initialize ArgumentCount.
store32(regT2, payloadFor(RegisterFile::ArgumentCount, regT3));
// Initialize 'this'.
emitLoad(thisValue, regT1, regT0);
store32(regT0, Address(regT3, OBJECT_OFFSETOF(JSValue, u.asBits.payload) + (CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
store32(regT1, Address(regT3, OBJECT_OFFSETOF(JSValue, u.asBits.tag) + (CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
// Copy arguments.
neg32(regT2);
end.append(branchAdd32(Zero, TrustedImm32(1), regT2));
// regT2: -argumentCount;
Label copyLoop = label();
load32(BaseIndex(callFrameRegister, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.payload) +(CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))), regT0);
load32(BaseIndex(callFrameRegister, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.tag) +(CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))), regT1);
store32(regT0, BaseIndex(regT3, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.payload) +(CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
store32(regT1, BaseIndex(regT3, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.tag) +(CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
branchAdd32(NonZero, TrustedImm32(1), regT2).linkTo(copyLoop, this);
end.append(jump());
}
if (m_codeBlock->usesArguments() && arguments == m_codeBlock->argumentsRegister())
slowCase.link(this);
JITStubCall stubCall(this, cti_op_load_varargs);
stubCall.addArgument(thisValue);
stubCall.addArgument(arguments);
stubCall.addArgument(Imm32(firstFreeRegister));
stubCall.call(regT3);
if (m_codeBlock->usesArguments() && arguments == m_codeBlock->argumentsRegister())
end.link(this);
}
//-----------------------------------------
void println(int expVal)
{
emitLoad(expVal);
freeTemp(expVal);
emitInstruction1("dout");
emitInstructionSS("ldc", "'\\n'");
emitInstruction1("aout");
}
void JIT::compileOpCall(OpcodeID opcodeID, Instruction* instruction, unsigned callLinkInfoIndex)
{
int callee = instruction[1].u.operand;
int argCount = instruction[2].u.operand;
int registerOffset = instruction[3].u.operand;
Jump wasEval;
if (opcodeID == op_call_eval) {
JITStubCall stubCall(this, cti_op_call_eval);
stubCall.addArgument(callee);
stubCall.addArgument(JIT::Imm32(registerOffset));
stubCall.addArgument(JIT::Imm32(argCount));
stubCall.call();
wasEval = branch32(NotEqual, regT1, TrustedImm32(JSValue::EmptyValueTag));
}
emitLoad(callee, regT1, regT0);
DataLabelPtr addressOfLinkedFunctionCheck;
BEGIN_UNINTERRUPTED_SEQUENCE(sequenceOpCall);
Jump jumpToSlow = branchPtrWithPatch(NotEqual, regT0, addressOfLinkedFunctionCheck, TrustedImmPtr(0));
END_UNINTERRUPTED_SEQUENCE(sequenceOpCall);
addSlowCase(jumpToSlow);
ASSERT_JIT_OFFSET(differenceBetween(addressOfLinkedFunctionCheck, jumpToSlow), patchOffsetOpCallCompareToJump);
ASSERT(m_callStructureStubCompilationInfo.size() == callLinkInfoIndex);
m_callStructureStubCompilationInfo.append(StructureStubCompilationInfo());
m_callStructureStubCompilationInfo[callLinkInfoIndex].hotPathBegin = addressOfLinkedFunctionCheck;
m_callStructureStubCompilationInfo[callLinkInfoIndex].isCall = opcodeID != op_construct;
m_callStructureStubCompilationInfo[callLinkInfoIndex].bytecodeIndex = m_bytecodeOffset;
addSlowCase(branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag)));
// The following is the fast case, only used whan a callee can be linked.
// Fast version of stack frame initialization, directly relative to edi.
// Note that this omits to set up RegisterFile::CodeBlock, which is set in the callee
loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_scopeChain)), regT2);
store32(TrustedImm32(JSValue::Int32Tag), tagFor(registerOffset + RegisterFile::ArgumentCount));
store32(Imm32(argCount), payloadFor(registerOffset + RegisterFile::ArgumentCount));
storePtr(callFrameRegister, payloadFor(RegisterFile::CallerFrame + registerOffset, callFrameRegister));
emitStore(registerOffset + RegisterFile::Callee, regT1, regT0);
store32(TrustedImm32(JSValue::CellTag), tagFor(registerOffset + RegisterFile::ScopeChain));
store32(regT2, payloadFor(registerOffset + RegisterFile::ScopeChain));
addPtr(Imm32(registerOffset * sizeof(Register)), callFrameRegister);
// Call to the callee
m_callStructureStubCompilationInfo[callLinkInfoIndex].hotPathOther = emitNakedCall();
if (opcodeID == op_call_eval)
wasEval.link(this);
sampleCodeBlock(m_codeBlock);
}
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, CallLinkInfo* info)
{
OpcodeID opcodeID = Op::opcodeID;
int thisValue = bytecode.m_thisValue.offset();
int arguments = bytecode.m_arguments.offset();
int firstFreeRegister = bytecode.m_firstFree.offset();
int firstVarArgOffset = bytecode.m_firstVarArg;
emitLoad(arguments, regT1, regT0);
Z_JITOperation_EJZZ sizeOperation;
if (Op::opcodeID == op_tail_call_forward_arguments)
sizeOperation = operationSizeFrameForForwardArguments;
else
sizeOperation = operationSizeFrameForVarargs;
callOperation(sizeOperation, JSValueRegs(regT1, regT0), -firstFreeRegister, firstVarArgOffset);
move(TrustedImm32(-firstFreeRegister), regT1);
emitSetVarargsFrame(*this, returnValueGPR, false, regT1, regT1);
addPtr(TrustedImm32(-(sizeof(CallerFrameAndPC) + WTF::roundUpToMultipleOf(stackAlignmentBytes(), 6 * sizeof(void*)))), regT1, stackPointerRegister);
emitLoad(arguments, regT2, regT4);
F_JITOperation_EFJZZ setupOperation;
if (opcodeID == op_tail_call_forward_arguments)
setupOperation = operationSetupForwardArgumentsFrame;
else
setupOperation = operationSetupVarargsFrame;
callOperation(setupOperation, regT1, JSValueRegs(regT2, regT4), firstVarArgOffset, regT0);
move(returnValueGPR, regT1);
// Profile the argument count.
load32(Address(regT1, CallFrameSlot::argumentCount * static_cast<int>(sizeof(Register)) + PayloadOffset), regT2);
load32(info->addressOfMaxNumArguments(), regT0);
Jump notBiggest = branch32(Above, regT0, regT2);
store32(regT2, info->addressOfMaxNumArguments());
notBiggest.link(this);
// Initialize 'this'.
emitLoad(thisValue, regT2, regT0);
store32(regT0, Address(regT1, PayloadOffset + (CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
store32(regT2, Address(regT1, TagOffset + (CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
addPtr(TrustedImm32(sizeof(CallerFrameAndPC)), regT1, stackPointerRegister);
}
void JIT::compileCallEvalSlowCase(Vector<SlowCaseEntry>::iterator& iter)
{
linkSlowCase(iter);
emitLoad(JSStack::Callee, regT1, regT0);
emitNakedCall(m_globalData->getCTIStub(virtualCallGenerator).code());
sampleCodeBlock(m_codeBlock);
}
void JIT::compileCallEvalSlowCase(Vector<SlowCaseEntry>::iterator& iter)
{
linkSlowCase(iter);
emitLoad(RegisterFile::Callee, regT1, regT0);
emitNakedCall(m_globalData->jitStubs->ctiVirtualCall());
sampleCodeBlock(m_codeBlock);
}
void JIT::emit_op_ret(Instruction* currentInstruction)
{
unsigned dst = currentInstruction[1].u.operand;
emitLoad(dst, regT1, regT0);
checkStackPointerAlignment();
emitFunctionEpilogue();
ret();
}
void JIT::compileCallEvalSlowCase(Instruction* instruction, Vector<SlowCaseEntry>::iterator& iter)
{
linkSlowCase(iter);
emitLoad(JSStack::Callee, regT1, regT0);
emitNakedCall(m_vm->getCTIStub(virtualCallThunkGenerator).code());
sampleCodeBlock(m_codeBlock);
emitPutCallResult(instruction);
}
void JIT::emit_op_ret(Instruction* currentInstruction)
{
unsigned dst = currentInstruction[1].u.operand;
emitLoad(dst, regT1, regT0);
emitGetFromCallFrameHeaderPtr(JSStack::ReturnPC, regT2);
emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, callFrameRegister);
restoreReturnAddressBeforeReturn(regT2);
ret();
}
//-----------------------------------------
int mult(int left, int right)
{
int temp;
emitLoad(left);
emitInstructionSI("mult", right);
freeTemp(left);
freeTemp(right);
temp = getTemp();
emitInstructionSI("st", temp);
return temp;
}
void JIT::emit_op_ret(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpRet>();
int value = bytecode.m_value.offset();
emitLoad(value, regT1, regT0);
checkStackPointerAlignment();
emitRestoreCalleeSaves();
emitFunctionEpilogue();
ret();
}
void JIT::emit_op_ret(Instruction* currentInstruction)
{
unsigned dst = currentInstruction[1].u.operand;
// We could JIT generate the deref, only calling out to C when the refcount hits zero.
if (m_codeBlock->needsFullScopeChain())
JITStubCall(this, cti_op_ret_scopeChain).call();
emitLoad(dst, regT1, regT0);
emitGetFromCallFrameHeaderPtr(RegisterFile::ReturnPC, regT2);
emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, callFrameRegister);
restoreReturnAddressBeforeReturn(regT2);
ret();
}
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, CallLinkInfo*)
{
auto& metadata = bytecode.metadata(m_codeBlock);
int argCount = bytecode.m_argc;
int registerOffset = -static_cast<int>(bytecode.m_argv);
if (Op::opcodeID == op_call && shouldEmitProfiling()) {
emitLoad(registerOffset + CallFrame::argumentOffsetIncludingThis(0), regT0, regT1);
Jump done = branchIfNotCell(regT0);
load32(Address(regT1, JSCell::structureIDOffset()), regT1);
store32(regT1, metadata.m_arrayProfile.addressOfLastSeenStructureID());
done.link(this);
}
addPtr(TrustedImm32(registerOffset * sizeof(Register) + sizeof(CallerFrameAndPC)), callFrameRegister, stackPointerRegister);
store32(TrustedImm32(argCount), Address(stackPointerRegister, CallFrameSlot::argumentCount * static_cast<int>(sizeof(Register)) + PayloadOffset - sizeof(CallerFrameAndPC)));
}
void JIT::compileCallEvalSlowCase(Instruction* instruction, Vector<SlowCaseEntry>::iterator& iter)
{
linkSlowCase(iter);
int registerOffset = -instruction[4].u.operand;
addPtr(TrustedImm32(registerOffset * sizeof(Register) + sizeof(CallerFrameAndPC)), callFrameRegister, stackPointerRegister);
loadPtr(Address(stackPointerRegister, sizeof(Register) * JSStack::Callee - sizeof(CallerFrameAndPC)), regT0);
loadPtr(Address(stackPointerRegister, sizeof(Register) * JSStack::Callee - sizeof(CallerFrameAndPC)), regT1);
move(TrustedImmPtr(&CallLinkInfo::dummy()), regT2);
emitLoad(JSStack::Callee, regT1, regT0);
emitNakedCall(m_vm->getCTIStub(virtualCallThunkGenerator).code());
addPtr(TrustedImm32(stackPointerOffsetFor(m_codeBlock) * sizeof(Register)), callFrameRegister, stackPointerRegister);
checkStackPointerAlignment();
sampleCodeBlock(m_codeBlock);
emitPutCallResult(instruction);
}
void JIT::compileCallEvalSlowCase(const Instruction* instruction, Vector<SlowCaseEntry>::iterator& iter)
{
linkAllSlowCases(iter);
auto bytecode = instruction->as<OpCallEval>();
CallLinkInfo* info = m_codeBlock->addCallLinkInfo();
info->setUpCall(CallLinkInfo::Call, CodeOrigin(m_bytecodeOffset), regT0);
int registerOffset = -bytecode.m_argv;
int callee = bytecode.m_callee.offset();
addPtr(TrustedImm32(registerOffset * sizeof(Register) + sizeof(CallerFrameAndPC)), callFrameRegister, stackPointerRegister);
emitLoad(callee, regT1, regT0);
emitDumbVirtualCall(*vm(), info);
addPtr(TrustedImm32(stackPointerOffsetFor(m_codeBlock) * sizeof(Register)), callFrameRegister, stackPointerRegister);
checkStackPointerAlignment();
sampleCodeBlock(m_codeBlock);
emitPutCallResult(bytecode);
}
void JIT::emit_op_ret(Instruction* currentInstruction)
{
unsigned dst = currentInstruction[1].u.operand;
// We could JIT generate the deref, only calling out to C when the refcount hits zero.
if (m_codeBlock->needsFullScopeChain()) {
Jump activationNotCreated = branch32(Equal, tagFor(m_codeBlock->activationRegister()), Imm32(JSValue::EmptyValueTag));
JITStubCall(this, cti_op_ret_scopeChain).call();
activationNotCreated.link(this);
}
emitLoad(dst, regT1, regT0);
#ifdef OPT_SCHED
emitGetFromCallFrameHeaderPtr(RegisterFile::ReturnPC, regLink);
emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, callFrameRegister);
#else
emitGetFromCallFrameHeaderPtr(RegisterFile::ReturnPC, regT2);
emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, callFrameRegister);
restoreReturnAddressBeforeReturn(regT2);
#endif
ret();
}
void QMathMLFileViewer::loadFileOfItem(int row, int /* column */)
{
QTableWidgetItem *item = filesTable->item(row, 0);
if( item )
emit hasSelectedItem( emitLoad( m_currentDir.absoluteFilePath( item->text() ), 0 ) != 0 );
}
void JIT::compileOpCall(OpcodeID opcodeID, Instruction* instruction, unsigned callLinkInfoIndex)
{
int callee = instruction[2].u.operand;
/* Caller always:
- Updates callFrameRegister to callee callFrame.
- Initializes ArgumentCount; CallerFrame; Callee.
For a JS call:
- Caller initializes ScopeChain.
- Callee initializes ReturnPC; CodeBlock.
- Callee restores callFrameRegister before return.
For a non-JS call:
- Caller initializes ScopeChain; ReturnPC; CodeBlock.
- Caller restores callFrameRegister after return.
*/
if (opcodeID == op_call_varargs)
compileLoadVarargs(instruction);
else {
int argCount = instruction[3].u.operand;
int registerOffset = -instruction[4].u.operand;
if (opcodeID == op_call && shouldEmitProfiling()) {
emitLoad(registerOffset + CallFrame::argumentOffsetIncludingThis(0), regT0, regT1);
Jump done = branch32(NotEqual, regT0, TrustedImm32(JSValue::CellTag));
loadPtr(Address(regT1, JSCell::structureOffset()), regT1);
storePtr(regT1, instruction[6].u.arrayProfile->addressOfLastSeenStructure());
done.link(this);
}
addPtr(TrustedImm32(registerOffset * sizeof(Register)), callFrameRegister, regT3);
store32(TrustedImm32(argCount), payloadFor(JSStack::ArgumentCount, regT3));
} // regT3 holds newCallFrame with ArgumentCount initialized.
uint32_t locationBits = CallFrame::Location::encodeAsBytecodeInstruction(instruction);
store32(TrustedImm32(locationBits), tagFor(JSStack::ArgumentCount, callFrameRegister));
emitLoad(callee, regT1, regT0); // regT1, regT0 holds callee.
storePtr(callFrameRegister, Address(regT3, JSStack::CallerFrame * static_cast<int>(sizeof(Register))));
emitStore(JSStack::Callee, regT1, regT0, regT3);
move(regT3, callFrameRegister);
if (opcodeID == op_call_eval) {
compileCallEval(instruction);
return;
}
DataLabelPtr addressOfLinkedFunctionCheck;
Jump slowCase = branchPtrWithPatch(NotEqual, regT0, addressOfLinkedFunctionCheck, TrustedImmPtr(0));
addSlowCase(slowCase);
addSlowCase(branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag)));
ASSERT(m_callStructureStubCompilationInfo.size() == callLinkInfoIndex);
m_callStructureStubCompilationInfo.append(StructureStubCompilationInfo());
m_callStructureStubCompilationInfo[callLinkInfoIndex].hotPathBegin = addressOfLinkedFunctionCheck;
m_callStructureStubCompilationInfo[callLinkInfoIndex].callType = CallLinkInfo::callTypeFor(opcodeID);
m_callStructureStubCompilationInfo[callLinkInfoIndex].bytecodeIndex = m_bytecodeOffset;
loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_scope)), regT1);
emitPutCellToCallFrameHeader(regT1, JSStack::ScopeChain);
m_callStructureStubCompilationInfo[callLinkInfoIndex].hotPathOther = emitNakedCall();
sampleCodeBlock(m_codeBlock);
emitPutCallResult(instruction);
}
void QMathMLFileViewer::loadFileOfItem(const QModelIndex& index)
{
emitLoad(m_dirModel.filePath( index ), 0);
}
void JIT::compileLoadVarargs(Instruction* instruction)
{
int thisValue = instruction[3].u.operand;
int arguments = instruction[4].u.operand;
int firstFreeRegister = instruction[5].u.operand;
JumpList slowCase;
JumpList end;
bool canOptimize = m_codeBlock->usesArguments()
&& VirtualRegister(arguments) == m_codeBlock->argumentsRegister()
&& !m_codeBlock->symbolTable()->slowArguments();
if (canOptimize) {
emitLoadTag(arguments, regT1);
slowCase.append(branch32(NotEqual, regT1, TrustedImm32(JSValue::EmptyValueTag)));
load32(payloadFor(JSStack::ArgumentCount), regT2);
slowCase.append(branch32(Above, regT2, TrustedImm32(Arguments::MaxArguments + 1)));
// regT2: argumentCountIncludingThis
move(regT2, regT3);
neg32(regT3);
add32(TrustedImm32(firstFreeRegister - JSStack::CallFrameHeaderSize), regT3);
lshift32(TrustedImm32(3), regT3);
addPtr(callFrameRegister, regT3);
// regT3: newCallFrame
slowCase.append(branchPtr(Above, AbsoluteAddress(m_vm->interpreter->stack().addressOfEnd()), regT3));
// Initialize ArgumentCount.
store32(regT2, payloadFor(JSStack::ArgumentCount, regT3));
// Initialize 'this'.
emitLoad(thisValue, regT1, regT0);
store32(regT0, Address(regT3, OBJECT_OFFSETOF(JSValue, u.asBits.payload) + (CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
store32(regT1, Address(regT3, OBJECT_OFFSETOF(JSValue, u.asBits.tag) + (CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
// Copy arguments.
end.append(branchSub32(Zero, TrustedImm32(1), regT2));
// regT2: argumentCount;
Label copyLoop = label();
load32(BaseIndex(callFrameRegister, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.payload) +(CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))), regT0);
load32(BaseIndex(callFrameRegister, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.tag) +(CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))), regT1);
store32(regT0, BaseIndex(regT3, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.payload) +(CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
store32(regT1, BaseIndex(regT3, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.tag) +(CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
branchSub32(NonZero, TrustedImm32(1), regT2).linkTo(copyLoop, this);
end.append(jump());
}
if (canOptimize)
slowCase.link(this);
emitLoad(thisValue, regT1, regT0);
emitLoad(arguments, regT3, regT2);
callOperation(operationLoadVarargs, regT1, regT0, regT3, regT2, firstFreeRegister);
move(returnValueRegister, regT3);
if (canOptimize)
end.link(this);
}
void JIT::compileOpCall(OpcodeID opcodeID, Instruction* instruction, unsigned callLinkInfoIndex)
{
CallLinkInfo* info = m_codeBlock->addCallLinkInfo();
int callee = instruction[2].u.operand;
/* 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.
*/
if (opcodeID == op_call_varargs || opcodeID == op_construct_varargs)
compileSetupVarargsFrame(instruction, info);
else {
int argCount = instruction[3].u.operand;
int registerOffset = -instruction[4].u.operand;
if (opcodeID == op_call && shouldEmitProfiling()) {
emitLoad(registerOffset + CallFrame::argumentOffsetIncludingThis(0), regT0, regT1);
Jump done = branch32(NotEqual, regT0, TrustedImm32(JSValue::CellTag));
loadPtr(Address(regT1, JSCell::structureIDOffset()), regT1);
storePtr(regT1, instruction[OPCODE_LENGTH(op_call) - 2].u.arrayProfile->addressOfLastSeenStructureID());
done.link(this);
}
addPtr(TrustedImm32(registerOffset * sizeof(Register) + sizeof(CallerFrameAndPC)), callFrameRegister, stackPointerRegister);
store32(TrustedImm32(argCount), Address(stackPointerRegister, JSStack::ArgumentCount * static_cast<int>(sizeof(Register)) + PayloadOffset - sizeof(CallerFrameAndPC)));
} // SP holds newCallFrame + sizeof(CallerFrameAndPC), with ArgumentCount initialized.
uint32_t locationBits = CallFrame::Location::encodeAsBytecodeInstruction(instruction);
store32(TrustedImm32(locationBits), tagFor(JSStack::ArgumentCount, callFrameRegister));
emitLoad(callee, regT1, regT0); // regT1, regT0 holds callee.
store32(regT0, Address(stackPointerRegister, JSStack::Callee * static_cast<int>(sizeof(Register)) + PayloadOffset - sizeof(CallerFrameAndPC)));
store32(regT1, Address(stackPointerRegister, JSStack::Callee * static_cast<int>(sizeof(Register)) + TagOffset - sizeof(CallerFrameAndPC)));
if (opcodeID == op_call_eval) {
compileCallEval(instruction);
return;
}
addSlowCase(branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag)));
DataLabelPtr addressOfLinkedFunctionCheck;
Jump slowCase = branchPtrWithPatch(NotEqual, regT0, addressOfLinkedFunctionCheck, TrustedImmPtr(0));
addSlowCase(slowCase);
ASSERT(m_callCompilationInfo.size() == callLinkInfoIndex);
info->setUpCall(CallLinkInfo::callTypeFor(opcodeID), CodeOrigin(m_bytecodeOffset), regT0);
m_callCompilationInfo.append(CallCompilationInfo());
m_callCompilationInfo[callLinkInfoIndex].hotPathBegin = addressOfLinkedFunctionCheck;
m_callCompilationInfo[callLinkInfoIndex].callLinkInfo = info;
checkStackPointerAlignment();
m_callCompilationInfo[callLinkInfoIndex].hotPathOther = emitNakedCall();
addPtr(TrustedImm32(stackPointerOffsetFor(m_codeBlock) * sizeof(Register)), callFrameRegister, stackPointerRegister);
checkStackPointerAlignment();
sampleCodeBlock(m_codeBlock);
emitPutCallResult(instruction);
}
void QMathMLFileViewer::loadFileOfItem(QTableWidgetItem *current, QTableWidgetItem * /*previous*/)
{
if( current )
emit hasSelectedItem( emitLoad( m_currentDir.absoluteFilePath( current->text() ), 0 ) != 0 );
}
//-----------------------------------------
void assign(int left, int expVal)
{
emitLoad(expVal);
freeTemp(expVal);
emitInstructionSI("st", left);
}
