JITOpcodes32_64.cpp [plain text]
#include "config.h"
#if ENABLE(JIT)
#if USE(JSVALUE32_64)
#include "JIT.h"
#include "CCallHelpers.h"
#include "Debugger.h"
#include "JITInlines.h"
#include "JSArray.h"
#include "JSCell.h"
#include "JSFunction.h"
#include "JSPropertyNameIterator.h"
#include "JSVariableObject.h"
#include "LinkBuffer.h"
#include "MaxFrameExtentForSlowPathCall.h"
#include "SlowPathCall.h"
#include "VirtualRegister.h"
namespace JSC {
JIT::CodeRef JIT::privateCompileCTINativeCall(VM* vm, NativeFunction func)
{
Call nativeCall;
emitFunctionPrologue();
emitPutImmediateToCallFrameHeader(0, JSStack::CodeBlock);
storePtr(callFrameRegister, &m_vm->topCallFrame);
#if CPU(X86)
emitGetCallerFrameFromCallFrameHeaderPtr(regT0);
emitGetFromCallFrameHeaderPtr(JSStack::ScopeChain, regT1, regT0);
emitPutCellToCallFrameHeader(regT1, JSStack::ScopeChain);
move(callFrameRegister, X86Registers::ecx);
subPtr(TrustedImm32(8), stackPointerRegister); storePtr(X86Registers::ecx, Address(stackPointerRegister));
nativeCall = call();
addPtr(TrustedImm32(8), stackPointerRegister);
#elif CPU(ARM) || CPU(SH4) || CPU(MIPS)
emitGetCallerFrameFromCallFrameHeaderPtr(regT2);
emitGetFromCallFrameHeaderPtr(JSStack::ScopeChain, regT1, regT2);
emitPutCellToCallFrameHeader(regT1, JSStack::ScopeChain);
#if CPU(MIPS)
subPtr(TrustedImm32(16), stackPointerRegister);
#endif
move(callFrameRegister, argumentGPR0);
emitGetFromCallFrameHeaderPtr(JSStack::Callee, argumentGPR1);
loadPtr(Address(argumentGPR1, OBJECT_OFFSETOF(JSFunction, m_executable)), regT2);
nativeCall = call();
#if CPU(MIPS)
addPtr(TrustedImm32(16), stackPointerRegister);
#endif
restoreReturnAddressBeforeReturn(regT3);
#else
#error "JIT not supported on this platform."
abortWithReason(JITNotSupported);
#endif // CPU(X86)
Jump sawException = branch32(NotEqual, AbsoluteAddress(reinterpret_cast<char*>(vm->addressOfException()) + OBJECT_OFFSETOF(JSValue, u.asBits.tag)), TrustedImm32(JSValue::EmptyValueTag));
emitFunctionEpilogue();
ret();
sawException.link(this);
storePtr(callFrameRegister, &m_vm->topCallFrame);
#if CPU(X86)
addPtr(TrustedImm32(-4), stackPointerRegister);
loadPtr(Address(callFrameRegister), X86Registers::ecx);
push(X86Registers::ecx);
#else
loadPtr(Address(callFrameRegister), argumentGPR0);
#endif
move(TrustedImmPtr(FunctionPtr(operationVMHandleException).value()), regT3);
call(regT3);
#if CPU(X86)
addPtr(TrustedImm32(8), stackPointerRegister);
#endif
jumpToExceptionHandler();
LinkBuffer patchBuffer(*m_vm, *this, GLOBAL_THUNK_ID);
patchBuffer.link(nativeCall, FunctionPtr(func));
return FINALIZE_CODE(patchBuffer, ("JIT CTI native call"));
}
void JIT::emit_op_mov(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int src = currentInstruction[2].u.operand;
if (m_codeBlock->isConstantRegisterIndex(src))
emitStore(dst, getConstantOperand(src));
else {
emitLoad(src, regT1, regT0);
emitStore(dst, regT1, regT0);
}
}
void JIT::emit_op_captured_mov(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int src = currentInstruction[2].u.operand;
emitLoad(src, regT1, regT0);
emitNotifyWrite(regT1, regT0, regT2, currentInstruction[3].u.watchpointSet);
emitStore(dst, regT1, regT0);
}
void JIT::emit_op_end(Instruction* currentInstruction)
{
ASSERT(returnValueGPR != callFrameRegister);
emitLoad(currentInstruction[1].u.operand, regT1, regT0);
emitFunctionEpilogue();
ret();
}
void JIT::emit_op_jmp(Instruction* currentInstruction)
{
unsigned target = currentInstruction[1].u.operand;
addJump(jump(), target);
}
void JIT::emit_op_new_object(Instruction* currentInstruction)
{
Structure* structure = currentInstruction[3].u.objectAllocationProfile->structure();
size_t allocationSize = JSFinalObject::allocationSize(structure->inlineCapacity());
MarkedAllocator* allocator = &m_vm->heap.allocatorForObjectWithoutDestructor(allocationSize);
RegisterID resultReg = regT0;
RegisterID allocatorReg = regT1;
RegisterID scratchReg = regT2;
move(TrustedImmPtr(allocator), allocatorReg);
emitAllocateJSObject(allocatorReg, TrustedImmPtr(structure), resultReg, scratchReg);
emitStoreCell(currentInstruction[1].u.operand, resultReg);
}
void JIT::emitSlow_op_new_object(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
linkSlowCase(iter);
int dst = currentInstruction[1].u.operand;
Structure* structure = currentInstruction[3].u.objectAllocationProfile->structure();
callOperation(operationNewObject, structure);
emitStoreCell(dst, returnValueGPR);
}
void JIT::emit_op_check_has_instance(Instruction* currentInstruction)
{
int baseVal = currentInstruction[3].u.operand;
emitLoadPayload(baseVal, regT0);
emitJumpSlowCaseIfNotJSCell(baseVal);
addSlowCase(branchTest8(Zero, Address(regT0, JSCell::typeInfoFlagsOffset()), TrustedImm32(ImplementsDefaultHasInstance)));
}
void JIT::emit_op_instanceof(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int value = currentInstruction[2].u.operand;
int proto = currentInstruction[3].u.operand;
emitLoadPayload(value, regT2);
emitLoadPayload(proto, regT1);
emitJumpSlowCaseIfNotJSCell(value);
emitJumpSlowCaseIfNotJSCell(proto);
addSlowCase(emitJumpIfCellNotObject(regT1));
move(TrustedImm32(1), regT0);
Label loop(this);
loadPtr(Address(regT2, JSCell::structureIDOffset()), regT2);
load32(Address(regT2, Structure::prototypeOffset() + OBJECT_OFFSETOF(JSValue, u.asBits.payload)), regT2);
Jump isInstance = branchPtr(Equal, regT2, regT1);
branchTest32(NonZero, regT2).linkTo(loop, this);
move(TrustedImm32(0), regT0);
isInstance.link(this);
emitStoreBool(dst, regT0);
}
void JIT::emitSlow_op_check_has_instance(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
int dst = currentInstruction[1].u.operand;
int value = currentInstruction[2].u.operand;
int baseVal = currentInstruction[3].u.operand;
linkSlowCaseIfNotJSCell(iter, baseVal);
linkSlowCase(iter);
emitLoad(value, regT1, regT0);
emitLoad(baseVal, regT3, regT2);
callOperation(operationCheckHasInstance, dst, regT1, regT0, regT3, regT2);
emitJumpSlowToHot(jump(), currentInstruction[4].u.operand);
}
void JIT::emitSlow_op_instanceof(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
int dst = currentInstruction[1].u.operand;
int value = currentInstruction[2].u.operand;
int proto = currentInstruction[3].u.operand;
linkSlowCaseIfNotJSCell(iter, value);
linkSlowCaseIfNotJSCell(iter, proto);
linkSlowCase(iter);
emitLoad(value, regT1, regT0);
emitLoad(proto, regT3, regT2);
callOperation(operationInstanceOf, dst, regT1, regT0, regT3, regT2);
}
void JIT::emit_op_is_undefined(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int value = currentInstruction[2].u.operand;
emitLoad(value, regT1, regT0);
Jump isCell = branch32(Equal, regT1, TrustedImm32(JSValue::CellTag));
compare32(Equal, regT1, TrustedImm32(JSValue::UndefinedTag), regT0);
Jump done = jump();
isCell.link(this);
Jump isMasqueradesAsUndefined = branchTest8(NonZero, Address(regT0, JSCell::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined));
move(TrustedImm32(0), regT0);
Jump notMasqueradesAsUndefined = jump();
isMasqueradesAsUndefined.link(this);
loadPtr(Address(regT0, JSCell::structureIDOffset()), regT1);
move(TrustedImmPtr(m_codeBlock->globalObject()), regT0);
loadPtr(Address(regT1, Structure::globalObjectOffset()), regT1);
compare32(Equal, regT0, regT1, regT0);
notMasqueradesAsUndefined.link(this);
done.link(this);
emitStoreBool(dst, regT0);
}
void JIT::emit_op_is_boolean(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int value = currentInstruction[2].u.operand;
emitLoadTag(value, regT0);
compare32(Equal, regT0, TrustedImm32(JSValue::BooleanTag), regT0);
emitStoreBool(dst, regT0);
}
void JIT::emit_op_is_number(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int value = currentInstruction[2].u.operand;
emitLoadTag(value, regT0);
add32(TrustedImm32(1), regT0);
compare32(Below, regT0, TrustedImm32(JSValue::LowestTag + 1), regT0);
emitStoreBool(dst, regT0);
}
void JIT::emit_op_is_string(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int value = currentInstruction[2].u.operand;
emitLoad(value, regT1, regT0);
Jump isNotCell = branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag));
compare8(Equal, Address(regT0, JSCell::typeInfoTypeOffset()), TrustedImm32(StringType), regT0);
Jump done = jump();
isNotCell.link(this);
move(TrustedImm32(0), regT0);
done.link(this);
emitStoreBool(dst, regT0);
}
void JIT::emit_op_tear_off_activation(Instruction* currentInstruction)
{
int activation = currentInstruction[1].u.operand;
Jump activationNotCreated = branch32(Equal, tagFor(activation), TrustedImm32(JSValue::EmptyValueTag));
emitLoadPayload(activation, regT0);
callOperation(operationTearOffActivation, regT0);
activationNotCreated.link(this);
}
void JIT::emit_op_tear_off_arguments(Instruction* currentInstruction)
{
VirtualRegister arguments = VirtualRegister(currentInstruction[1].u.operand);
int activation = currentInstruction[2].u.operand;
Jump argsNotCreated = branch32(Equal, tagFor(unmodifiedArgumentsRegister(arguments).offset()), TrustedImm32(JSValue::EmptyValueTag));
emitLoadPayload(unmodifiedArgumentsRegister(VirtualRegister(arguments)).offset(), regT0);
emitLoadPayload(activation, regT1);
callOperation(operationTearOffArguments, regT0, regT1);
argsNotCreated.link(this);
}
void JIT::emit_op_to_primitive(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int src = currentInstruction[2].u.operand;
emitLoad(src, regT1, regT0);
Jump isImm = branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag));
addSlowCase(branchPtr(NotEqual, Address(regT0, JSCell::structureIDOffset()), TrustedImmPtr(m_vm->stringStructure.get())));
isImm.link(this);
if (dst != src)
emitStore(dst, regT1, regT0);
}
void JIT::emitSlow_op_to_primitive(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
linkSlowCase(iter);
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_to_primitive);
slowPathCall.call();
}
void JIT::emit_op_strcat(Instruction* currentInstruction)
{
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_strcat);
slowPathCall.call();
}
void JIT::emit_op_not(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int src = currentInstruction[2].u.operand;
emitLoadTag(src, regT0);
emitLoad(src, regT1, regT0);
addSlowCase(branch32(NotEqual, regT1, TrustedImm32(JSValue::BooleanTag)));
xor32(TrustedImm32(1), regT0);
emitStoreBool(dst, regT0, (dst == src));
}
void JIT::emitSlow_op_not(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
linkSlowCase(iter);
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_not);
slowPathCall.call();
}
void JIT::emit_op_jfalse(Instruction* currentInstruction)
{
int cond = currentInstruction[1].u.operand;
unsigned target = currentInstruction[2].u.operand;
emitLoad(cond, regT1, regT0);
ASSERT((JSValue::BooleanTag + 1 == JSValue::Int32Tag) && !(JSValue::Int32Tag + 1));
addSlowCase(branch32(Below, regT1, TrustedImm32(JSValue::BooleanTag)));
addJump(branchTest32(Zero, regT0), target);
}
void JIT::emitSlow_op_jfalse(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
int cond = currentInstruction[1].u.operand;
unsigned target = currentInstruction[2].u.operand;
linkSlowCase(iter);
if (supportsFloatingPoint()) {
Jump notNumber = branch32(Above, regT1, TrustedImm32(JSValue::LowestTag));
emitLoadDouble(cond, fpRegT0);
emitJumpSlowToHot(branchDoubleZeroOrNaN(fpRegT0, fpRegT1), target);
emitJumpSlowToHot(jump(), OPCODE_LENGTH(op_jfalse));
notNumber.link(this);
}
callOperation(operationConvertJSValueToBoolean, regT1, regT0);
emitJumpSlowToHot(branchTest32(Zero, returnValueGPR), target); }
void JIT::emit_op_jtrue(Instruction* currentInstruction)
{
int cond = currentInstruction[1].u.operand;
unsigned target = currentInstruction[2].u.operand;
emitLoad(cond, regT1, regT0);
ASSERT((JSValue::BooleanTag + 1 == JSValue::Int32Tag) && !(JSValue::Int32Tag + 1));
addSlowCase(branch32(Below, regT1, TrustedImm32(JSValue::BooleanTag)));
addJump(branchTest32(NonZero, regT0), target);
}
void JIT::emitSlow_op_jtrue(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
int cond = currentInstruction[1].u.operand;
unsigned target = currentInstruction[2].u.operand;
linkSlowCase(iter);
if (supportsFloatingPoint()) {
Jump notNumber = branch32(Above, regT1, TrustedImm32(JSValue::LowestTag));
emitLoadDouble(cond, fpRegT0);
emitJumpSlowToHot(branchDoubleNonZero(fpRegT0, fpRegT1), target);
emitJumpSlowToHot(jump(), OPCODE_LENGTH(op_jtrue));
notNumber.link(this);
}
callOperation(operationConvertJSValueToBoolean, regT1, regT0);
emitJumpSlowToHot(branchTest32(NonZero, returnValueGPR), target);
}
void JIT::emit_op_jeq_null(Instruction* currentInstruction)
{
int src = currentInstruction[1].u.operand;
unsigned target = currentInstruction[2].u.operand;
emitLoad(src, regT1, regT0);
Jump isImmediate = branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag));
Jump isNotMasqueradesAsUndefined = branchTest8(Zero, Address(regT0, JSCell::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined));
loadPtr(Address(regT0, JSCell::structureIDOffset()), regT2);
move(TrustedImmPtr(m_codeBlock->globalObject()), regT0);
addJump(branchPtr(Equal, Address(regT2, Structure::globalObjectOffset()), regT0), target);
Jump masqueradesGlobalObjectIsForeign = jump();
isImmediate.link(this);
ASSERT((JSValue::UndefinedTag + 1 == JSValue::NullTag) && (JSValue::NullTag & 0x1));
or32(TrustedImm32(1), regT1);
addJump(branch32(Equal, regT1, TrustedImm32(JSValue::NullTag)), target);
isNotMasqueradesAsUndefined.link(this);
masqueradesGlobalObjectIsForeign.link(this);
}
void JIT::emit_op_jneq_null(Instruction* currentInstruction)
{
int src = currentInstruction[1].u.operand;
unsigned target = currentInstruction[2].u.operand;
emitLoad(src, regT1, regT0);
Jump isImmediate = branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag));
addJump(branchTest8(Zero, Address(regT0, JSCell::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined)), target);
loadPtr(Address(regT0, JSCell::structureIDOffset()), regT2);
move(TrustedImmPtr(m_codeBlock->globalObject()), regT0);
addJump(branchPtr(NotEqual, Address(regT2, Structure::globalObjectOffset()), regT0), target);
Jump wasNotImmediate = jump();
isImmediate.link(this);
ASSERT((JSValue::UndefinedTag + 1 == JSValue::NullTag) && (JSValue::NullTag & 0x1));
or32(TrustedImm32(1), regT1);
addJump(branch32(NotEqual, regT1, TrustedImm32(JSValue::NullTag)), target);
wasNotImmediate.link(this);
}
void JIT::emit_op_jneq_ptr(Instruction* currentInstruction)
{
int src = currentInstruction[1].u.operand;
Special::Pointer ptr = currentInstruction[2].u.specialPointer;
unsigned target = currentInstruction[3].u.operand;
emitLoad(src, regT1, regT0);
addJump(branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag)), target);
addJump(branchPtr(NotEqual, regT0, TrustedImmPtr(actualPointerFor(m_codeBlock, ptr))), target);
}
void JIT::emit_op_eq(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int src1 = currentInstruction[2].u.operand;
int src2 = currentInstruction[3].u.operand;
emitLoad2(src1, regT1, regT0, src2, regT3, regT2);
addSlowCase(branch32(NotEqual, regT1, regT3));
addSlowCase(branch32(Equal, regT1, TrustedImm32(JSValue::CellTag)));
addSlowCase(branch32(Below, regT1, TrustedImm32(JSValue::LowestTag)));
compare32(Equal, regT0, regT2, regT0);
emitStoreBool(dst, regT0);
}
void JIT::emitSlow_op_eq(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
int dst = currentInstruction[1].u.operand;
int op1 = currentInstruction[2].u.operand;
int op2 = currentInstruction[3].u.operand;
JumpList storeResult;
JumpList genericCase;
genericCase.append(getSlowCase(iter));
linkSlowCase(iter); genericCase.append(branchPtr(NotEqual, Address(regT0, JSCell::structureIDOffset()), TrustedImmPtr(m_vm->stringStructure.get())));
genericCase.append(branchPtr(NotEqual, Address(regT2, JSCell::structureIDOffset()), TrustedImmPtr(m_vm->stringStructure.get())));
callOperation(operationCompareStringEq, regT0, regT2);
storeResult.append(jump());
genericCase.append(getSlowCase(iter)); genericCase.link(this);
emitLoad(op1, regT1, regT0);
emitLoad(op2, regT3, regT2);
callOperation(operationCompareEq, regT1, regT0, regT3, regT2);
storeResult.link(this);
emitStoreBool(dst, returnValueGPR);
}
void JIT::emit_op_neq(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int src1 = currentInstruction[2].u.operand;
int src2 = currentInstruction[3].u.operand;
emitLoad2(src1, regT1, regT0, src2, regT3, regT2);
addSlowCase(branch32(NotEqual, regT1, regT3));
addSlowCase(branch32(Equal, regT1, TrustedImm32(JSValue::CellTag)));
addSlowCase(branch32(Below, regT1, TrustedImm32(JSValue::LowestTag)));
compare32(NotEqual, regT0, regT2, regT0);
emitStoreBool(dst, regT0);
}
void JIT::emitSlow_op_neq(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
int dst = currentInstruction[1].u.operand;
JumpList storeResult;
JumpList genericCase;
genericCase.append(getSlowCase(iter));
linkSlowCase(iter); genericCase.append(branchPtr(NotEqual, Address(regT0, JSCell::structureIDOffset()), TrustedImmPtr(m_vm->stringStructure.get())));
genericCase.append(branchPtr(NotEqual, Address(regT2, JSCell::structureIDOffset()), TrustedImmPtr(m_vm->stringStructure.get())));
callOperation(operationCompareStringEq, regT0, regT2);
storeResult.append(jump());
genericCase.append(getSlowCase(iter)); genericCase.link(this);
callOperation(operationCompareEq, regT1, regT0, regT3, regT2);
storeResult.link(this);
xor32(TrustedImm32(0x1), returnValueGPR);
emitStoreBool(dst, returnValueGPR);
}
void JIT::compileOpStrictEq(Instruction* currentInstruction, CompileOpStrictEqType type)
{
int dst = currentInstruction[1].u.operand;
int src1 = currentInstruction[2].u.operand;
int src2 = currentInstruction[3].u.operand;
emitLoad2(src1, regT1, regT0, src2, regT3, regT2);
addSlowCase(branch32(NotEqual, regT1, regT3));
addSlowCase(branch32(Below, regT1, TrustedImm32(JSValue::LowestTag)));
Jump notCell = branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag));
Jump firstNotString = branchPtr(NotEqual, Address(regT0, JSCell::structureIDOffset()), TrustedImmPtr(m_vm->stringStructure.get()));
addSlowCase(branchPtr(Equal, Address(regT2, JSCell::structureIDOffset()), TrustedImmPtr(m_vm->stringStructure.get())));
notCell.link(this);
firstNotString.link(this);
if (type == OpStrictEq)
compare32(Equal, regT0, regT2, regT0);
else
compare32(NotEqual, regT0, regT2, regT0);
emitStoreBool(dst, regT0);
}
void JIT::emit_op_stricteq(Instruction* currentInstruction)
{
compileOpStrictEq(currentInstruction, OpStrictEq);
}
void JIT::emitSlow_op_stricteq(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
linkSlowCase(iter);
linkSlowCase(iter);
linkSlowCase(iter);
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_stricteq);
slowPathCall.call();
}
void JIT::emit_op_nstricteq(Instruction* currentInstruction)
{
compileOpStrictEq(currentInstruction, OpNStrictEq);
}
void JIT::emitSlow_op_nstricteq(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
linkSlowCase(iter);
linkSlowCase(iter);
linkSlowCase(iter);
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_nstricteq);
slowPathCall.call();
}
void JIT::emit_op_eq_null(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int src = currentInstruction[2].u.operand;
emitLoad(src, regT1, regT0);
Jump isImmediate = branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag));
Jump isMasqueradesAsUndefined = branchTest8(NonZero, Address(regT0, JSCell::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined));
move(TrustedImm32(0), regT1);
Jump wasNotMasqueradesAsUndefined = jump();
isMasqueradesAsUndefined.link(this);
loadPtr(Address(regT0, JSCell::structureIDOffset()), regT2);
move(TrustedImmPtr(m_codeBlock->globalObject()), regT0);
loadPtr(Address(regT2, Structure::globalObjectOffset()), regT2);
compare32(Equal, regT0, regT2, regT1);
Jump wasNotImmediate = jump();
isImmediate.link(this);
compare32(Equal, regT1, TrustedImm32(JSValue::NullTag), regT2);
compare32(Equal, regT1, TrustedImm32(JSValue::UndefinedTag), regT1);
or32(regT2, regT1);
wasNotImmediate.link(this);
wasNotMasqueradesAsUndefined.link(this);
emitStoreBool(dst, regT1);
}
void JIT::emit_op_neq_null(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int src = currentInstruction[2].u.operand;
emitLoad(src, regT1, regT0);
Jump isImmediate = branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag));
Jump isMasqueradesAsUndefined = branchTest8(NonZero, Address(regT0, JSCell::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined));
move(TrustedImm32(1), regT1);
Jump wasNotMasqueradesAsUndefined = jump();
isMasqueradesAsUndefined.link(this);
loadPtr(Address(regT0, JSCell::structureIDOffset()), regT2);
move(TrustedImmPtr(m_codeBlock->globalObject()), regT0);
loadPtr(Address(regT2, Structure::globalObjectOffset()), regT2);
compare32(NotEqual, regT0, regT2, regT1);
Jump wasNotImmediate = jump();
isImmediate.link(this);
compare32(NotEqual, regT1, TrustedImm32(JSValue::NullTag), regT2);
compare32(NotEqual, regT1, TrustedImm32(JSValue::UndefinedTag), regT1);
and32(regT2, regT1);
wasNotImmediate.link(this);
wasNotMasqueradesAsUndefined.link(this);
emitStoreBool(dst, regT1);
}
void JIT::emit_op_throw(Instruction* currentInstruction)
{
ASSERT(regT0 == returnValueGPR);
emitLoad(currentInstruction[1].u.operand, regT1, regT0);
callOperationNoExceptionCheck(operationThrow, regT1, regT0);
jumpToExceptionHandler();
}
void JIT::emit_op_get_pnames(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int base = currentInstruction[2].u.operand;
int i = currentInstruction[3].u.operand;
int size = currentInstruction[4].u.operand;
int breakTarget = currentInstruction[5].u.operand;
JumpList isNotObject;
emitLoad(base, regT1, regT0);
if (!m_codeBlock->isKnownNotImmediate(base))
isNotObject.append(branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag)));
if (VirtualRegister(base) != m_codeBlock->thisRegister() || m_codeBlock->isStrictMode())
isNotObject.append(emitJumpIfCellNotObject(regT0));
Label isObject(this);
callOperation(operationGetPNames, regT0);
emitStoreCell(dst, returnValueGPR);
load32(Address(regT0, OBJECT_OFFSETOF(JSPropertyNameIterator, m_jsStringsSize)), regT3);
store32(TrustedImm32(Int32Tag), intTagFor(i));
store32(TrustedImm32(0), intPayloadFor(i));
store32(TrustedImm32(Int32Tag), intTagFor(size));
store32(regT3, payloadFor(size));
Jump end = jump();
isNotObject.link(this);
addJump(branch32(Equal, regT1, TrustedImm32(JSValue::NullTag)), breakTarget);
addJump(branch32(Equal, regT1, TrustedImm32(JSValue::UndefinedTag)), breakTarget);
callOperation(operationToObject, base, regT1, regT0);
jump().linkTo(isObject, this);
end.link(this);
}
void JIT::emit_op_next_pname(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int base = currentInstruction[2].u.operand;
int i = currentInstruction[3].u.operand;
int size = currentInstruction[4].u.operand;
int it = currentInstruction[5].u.operand;
int target = currentInstruction[6].u.operand;
JumpList callHasProperty;
Label begin(this);
load32(intPayloadFor(i), regT0);
Jump end = branch32(Equal, regT0, intPayloadFor(size));
loadPtr(payloadFor(it), regT1);
loadPtr(Address(regT1, OBJECT_OFFSETOF(JSPropertyNameIterator, m_jsStrings)), regT2);
load32(BaseIndex(regT2, regT0, TimesEight), regT2);
store32(TrustedImm32(JSValue::CellTag), tagFor(dst));
store32(regT2, payloadFor(dst));
add32(TrustedImm32(1), regT0);
store32(regT0, intPayloadFor(i));
loadPtr(payloadFor(base), regT0);
loadPtr(Address(regT0, JSCell::structureIDOffset()), regT2);
callHasProperty.append(branchPtr(NotEqual, regT2, Address(Address(regT1, OBJECT_OFFSETOF(JSPropertyNameIterator, m_cachedStructure)))));
loadPtr(Address(Address(regT1, OBJECT_OFFSETOF(JSPropertyNameIterator, m_cachedPrototypeChain))), regT3);
loadPtr(Address(regT3, OBJECT_OFFSETOF(StructureChain, m_vector)), regT3);
addJump(branchTestPtr(Zero, Address(regT3)), target);
Label checkPrototype(this);
callHasProperty.append(branch32(Equal, Address(regT2, Structure::prototypeOffset() + OBJECT_OFFSETOF(JSValue, u.asBits.tag)), TrustedImm32(JSValue::NullTag)));
loadPtr(Address(regT2, Structure::prototypeOffset() + OBJECT_OFFSETOF(JSValue, u.asBits.payload)), regT2);
loadPtr(Address(regT2, JSCell::structureIDOffset()), regT2);
callHasProperty.append(branchPtr(NotEqual, regT2, Address(regT3)));
addPtr(TrustedImm32(sizeof(Structure*)), regT3);
branchTestPtr(NonZero, Address(regT3)).linkTo(checkPrototype, this);
addJump(jump(), target);
callHasProperty.link(this);
loadPtr(addressFor(dst), regT1);
callOperation(operationHasProperty, regT0, regT1);
addJump(branchTest32(NonZero, regT0), target);
jump().linkTo(begin, this);
end.link(this);
}
void JIT::emit_op_push_with_scope(Instruction* currentInstruction)
{
emitLoad(currentInstruction[1].u.operand, regT1, regT0);
callOperation(operationPushWithScope, regT1, regT0);
}
void JIT::emit_op_pop_scope(Instruction*)
{
callOperation(operationPopScope);
}
void JIT::emit_op_to_number(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int src = currentInstruction[2].u.operand;
emitLoad(src, regT1, regT0);
Jump isInt32 = branch32(Equal, regT1, TrustedImm32(JSValue::Int32Tag));
addSlowCase(branch32(AboveOrEqual, regT1, TrustedImm32(JSValue::LowestTag)));
isInt32.link(this);
if (src != dst)
emitStore(dst, regT1, regT0);
}
void JIT::emitSlow_op_to_number(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
linkSlowCase(iter);
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_to_number);
slowPathCall.call();
}
void JIT::emit_op_push_name_scope(Instruction* currentInstruction)
{
emitLoad(currentInstruction[2].u.operand, regT1, regT0);
callOperation(operationPushNameScope, &m_codeBlock->identifier(currentInstruction[1].u.operand), regT1, regT0, currentInstruction[3].u.operand);
}
void JIT::emit_op_catch(Instruction* currentInstruction)
{
move(TrustedImmPtr(m_vm), regT3);
load32(Address(regT3, VM::callFrameForThrowOffset()), callFrameRegister);
addPtr(TrustedImm32(stackPointerOffsetFor(codeBlock()) * sizeof(Register)), callFrameRegister, stackPointerRegister);
load32(Address(regT3, VM::exceptionOffset() + OBJECT_OFFSETOF(JSValue, u.asBits.payload)), regT0);
load32(Address(regT3, VM::exceptionOffset() + OBJECT_OFFSETOF(JSValue, u.asBits.tag)), regT1);
store32(TrustedImm32(JSValue().payload()), Address(regT3, VM::exceptionOffset() + OBJECT_OFFSETOF(JSValue, u.asBits.payload)));
store32(TrustedImm32(JSValue().tag()), Address(regT3, VM::exceptionOffset() + OBJECT_OFFSETOF(JSValue, u.asBits.tag)));
unsigned exception = currentInstruction[1].u.operand;
emitStore(exception, regT1, regT0);
}
void JIT::emit_op_switch_imm(Instruction* currentInstruction)
{
size_t tableIndex = currentInstruction[1].u.operand;
unsigned defaultOffset = currentInstruction[2].u.operand;
unsigned scrutinee = currentInstruction[3].u.operand;
SimpleJumpTable* jumpTable = &m_codeBlock->switchJumpTable(tableIndex);
m_switches.append(SwitchRecord(jumpTable, m_bytecodeOffset, defaultOffset, SwitchRecord::Immediate));
jumpTable->ensureCTITable();
emitLoad(scrutinee, regT1, regT0);
callOperation(operationSwitchImmWithUnknownKeyType, regT1, regT0, tableIndex);
jump(returnValueGPR);
}
void JIT::emit_op_switch_char(Instruction* currentInstruction)
{
size_t tableIndex = currentInstruction[1].u.operand;
unsigned defaultOffset = currentInstruction[2].u.operand;
unsigned scrutinee = currentInstruction[3].u.operand;
SimpleJumpTable* jumpTable = &m_codeBlock->switchJumpTable(tableIndex);
m_switches.append(SwitchRecord(jumpTable, m_bytecodeOffset, defaultOffset, SwitchRecord::Character));
jumpTable->ensureCTITable();
emitLoad(scrutinee, regT1, regT0);
callOperation(operationSwitchCharWithUnknownKeyType, regT1, regT0, tableIndex);
jump(returnValueGPR);
}
void JIT::emit_op_switch_string(Instruction* currentInstruction)
{
size_t tableIndex = currentInstruction[1].u.operand;
unsigned defaultOffset = currentInstruction[2].u.operand;
unsigned scrutinee = currentInstruction[3].u.operand;
StringJumpTable* jumpTable = &m_codeBlock->stringSwitchJumpTable(tableIndex);
m_switches.append(SwitchRecord(jumpTable, m_bytecodeOffset, defaultOffset));
emitLoad(scrutinee, regT1, regT0);
callOperation(operationSwitchStringWithUnknownKeyType, regT1, regT0, tableIndex);
jump(returnValueGPR);
}
void JIT::emit_op_throw_static_error(Instruction* currentInstruction)
{
emitLoad(m_codeBlock->getConstant(currentInstruction[1].u.operand), regT1, regT0);
callOperation(operationThrowStaticError, regT1, regT0, currentInstruction[2].u.operand);
}
void JIT::emit_op_debug(Instruction* currentInstruction)
{
load32(codeBlock()->debuggerRequestsAddress(), regT0);
Jump noDebuggerRequests = branchTest32(Zero, regT0);
callOperation(operationDebug, currentInstruction[1].u.operand);
noDebuggerRequests.link(this);
}
void JIT::emit_op_enter(Instruction* currentInstruction)
{
emitEnterOptimizationCheck();
for (int i = 0; i < m_codeBlock->m_numVars; ++i)
emitStore(virtualRegisterForLocal(i).offset(), jsUndefined());
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_enter);
slowPathCall.call();
}
void JIT::emit_op_create_activation(Instruction* currentInstruction)
{
int activation = currentInstruction[1].u.operand;
Jump activationCreated = branch32(NotEqual, tagFor(activation), TrustedImm32(JSValue::EmptyValueTag));
callOperation(operationCreateActivation, 0);
emitStoreCell(activation, returnValueGPR);
activationCreated.link(this);
}
void JIT::emit_op_create_arguments(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
Jump argsCreated = branch32(NotEqual, tagFor(dst), TrustedImm32(JSValue::EmptyValueTag));
callOperation(operationCreateArguments);
emitStoreCell(dst, returnValueGPR);
emitStoreCell(unmodifiedArgumentsRegister(VirtualRegister(dst)).offset(), returnValueGPR);
argsCreated.link(this);
}
void JIT::emit_op_init_lazy_reg(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
emitStore(dst, JSValue());
}
void JIT::emit_op_get_callee(Instruction* currentInstruction)
{
int result = currentInstruction[1].u.operand;
WriteBarrierBase<JSCell>* cachedFunction = ¤tInstruction[2].u.jsCell;
emitGetFromCallFrameHeaderPtr(JSStack::Callee, regT0);
loadPtr(cachedFunction, regT2);
addSlowCase(branchPtr(NotEqual, regT0, regT2));
move(TrustedImm32(JSValue::CellTag), regT1);
emitStore(result, regT1, regT0);
}
void JIT::emitSlow_op_get_callee(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
linkSlowCase(iter);
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_get_callee);
slowPathCall.call();
}
void JIT::emit_op_create_this(Instruction* currentInstruction)
{
int callee = currentInstruction[2].u.operand;
RegisterID calleeReg = regT0;
RegisterID resultReg = regT0;
RegisterID allocatorReg = regT1;
RegisterID structureReg = regT2;
RegisterID scratchReg = regT3;
emitLoadPayload(callee, calleeReg);
loadPtr(Address(calleeReg, JSFunction::offsetOfAllocationProfile() + ObjectAllocationProfile::offsetOfAllocator()), allocatorReg);
loadPtr(Address(calleeReg, JSFunction::offsetOfAllocationProfile() + ObjectAllocationProfile::offsetOfStructure()), structureReg);
addSlowCase(branchTestPtr(Zero, allocatorReg));
emitAllocateJSObject(allocatorReg, structureReg, resultReg, scratchReg);
emitStoreCell(currentInstruction[1].u.operand, resultReg);
}
void JIT::emitSlow_op_create_this(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
linkSlowCase(iter); linkSlowCase(iter);
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_create_this);
slowPathCall.call();
}
void JIT::emit_op_to_this(Instruction* currentInstruction)
{
WriteBarrierBase<Structure>* cachedStructure = ¤tInstruction[2].u.structure;
int thisRegister = currentInstruction[1].u.operand;
emitLoad(thisRegister, regT3, regT2);
addSlowCase(branch32(NotEqual, regT3, TrustedImm32(JSValue::CellTag)));
addSlowCase(branch8(NotEqual, Address(regT2, JSCell::typeInfoTypeOffset()), TrustedImm32(FinalObjectType)));
loadPtr(Address(regT2, JSCell::structureIDOffset()), regT0);
loadPtr(cachedStructure, regT2);
addSlowCase(branchPtr(NotEqual, regT0, regT2));
}
void JIT::emitSlow_op_to_this(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
linkSlowCase(iter);
linkSlowCase(iter);
linkSlowCase(iter);
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_to_this);
slowPathCall.call();
}
void JIT::emit_op_profile_will_call(Instruction* currentInstruction)
{
load32(m_vm->enabledProfilerAddress(), regT0);
Jump profilerDone = branchTestPtr(Zero, regT0);
emitLoad(currentInstruction[1].u.operand, regT1, regT0);
callOperation(operationProfileWillCall, regT1, regT0);
profilerDone.link(this);
}
void JIT::emit_op_profile_did_call(Instruction* currentInstruction)
{
load32(m_vm->enabledProfilerAddress(), regT0);
Jump profilerDone = branchTestPtr(Zero, regT0);
emitLoad(currentInstruction[1].u.operand, regT1, regT0);
callOperation(operationProfileDidCall, regT1, regT0);
profilerDone.link(this);
}
void JIT::emit_op_get_arguments_length(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int argumentsRegister = currentInstruction[2].u.operand;
addSlowCase(branch32(NotEqual, tagFor(argumentsRegister), TrustedImm32(JSValue::EmptyValueTag)));
load32(payloadFor(JSStack::ArgumentCount), regT0);
sub32(TrustedImm32(1), regT0);
emitStoreInt32(dst, regT0);
}
void JIT::emitSlow_op_get_arguments_length(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
linkSlowCase(iter);
int dst = currentInstruction[1].u.operand;
int base = currentInstruction[2].u.operand;
callOperation(operationGetArgumentsLength, dst, base);
}
void JIT::emit_op_get_argument_by_val(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int argumentsRegister = currentInstruction[2].u.operand;
int property = currentInstruction[3].u.operand;
addSlowCase(branch32(NotEqual, tagFor(argumentsRegister), TrustedImm32(JSValue::EmptyValueTag)));
emitLoad(property, regT1, regT2);
addSlowCase(branch32(NotEqual, regT1, TrustedImm32(JSValue::Int32Tag)));
add32(TrustedImm32(1), regT2);
load32(payloadFor(JSStack::ArgumentCount), regT3);
addSlowCase(branch32(AboveOrEqual, regT2, regT3));
loadPtr(BaseIndex(callFrameRegister, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.payload) + CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register))), regT0);
loadPtr(BaseIndex(callFrameRegister, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.tag) + CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register))), regT1);
emitValueProfilingSite();
emitStore(dst, regT1, regT0);
}
void JIT::emitSlow_op_get_argument_by_val(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
int dst = currentInstruction[1].u.operand;
int arguments = currentInstruction[2].u.operand;
int property = currentInstruction[3].u.operand;
linkSlowCase(iter);
Jump skipArgumentsCreation = jump();
linkSlowCase(iter);
linkSlowCase(iter);
callOperation(operationCreateArguments);
emitStoreCell(arguments, returnValueGPR);
emitStoreCell(unmodifiedArgumentsRegister(VirtualRegister(arguments)).offset(), returnValueGPR);
skipArgumentsCreation.link(this);
emitLoad(arguments, regT1, regT0);
emitLoad(property, regT3, regT2);
callOperation(WithProfile, operationGetByValGeneric, dst, regT1, regT0, regT3, regT2);
}
}
#endif // USE(JSVALUE32_64)
#endif // ENABLE(JIT)