/*

* Copyright (C) 2008 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.

*/

#ifndef JITInlineMethods_h

#define JITInlineMethods_h

#if ENABLE(JIT)

namespace JSC {

/* Deprecated: Please use JITStubCall instead. */

// puts an arg onto the stack, as an arg to a context threaded function.

ALWAYS_INLINE void JIT::emitPutJITStubArg(RegisterID src, unsigned argumentNumber)

{

unsigned argumentStackOffset = (argumentNumber * (sizeof(JSValue) / sizeof(void*))) + JITSTACKFRAME_ARGS_INDEX;

poke(src, argumentStackOffset);

}

/* Deprecated: Please use JITStubCall instead. */

ALWAYS_INLINE void JIT::emitPutJITStubArgConstant(unsigned value, unsigned argumentNumber)

{

unsigned argumentStackOffset = (argumentNumber * (sizeof(JSValue) / sizeof(void*))) + JITSTACKFRAME_ARGS_INDEX;

poke(Imm32(value), argumentStackOffset);

}

/* Deprecated: Please use JITStubCall instead. */

ALWAYS_INLINE void JIT::emitPutJITStubArgConstant(void* value, unsigned argumentNumber)

{

unsigned argumentStackOffset = (argumentNumber * (sizeof(JSValue) / sizeof(void*))) + JITSTACKFRAME_ARGS_INDEX;

poke(ImmPtr(value), argumentStackOffset);

}

/* Deprecated: Please use JITStubCall instead. */

ALWAYS_INLINE void JIT::emitGetJITStubArg(unsigned argumentNumber, RegisterID dst)

{

unsigned argumentStackOffset = (argumentNumber * (sizeof(JSValue) / sizeof(void*))) + JITSTACKFRAME_ARGS_INDEX;

peek(dst, argumentStackOffset);

}

ALWAYS_INLINE bool JIT::isOperandConstantImmediateDouble(unsigned src)

{

return m_codeBlock->isConstantRegisterIndex(src) && getConstantOperand(src).isDouble();

}

ALWAYS_INLINE JSValue JIT::getConstantOperand(unsigned src)

{

ASSERT(m_codeBlock->isConstantRegisterIndex(src));

return m_codeBlock->getConstant(src);

}

ALWAYS_INLINE void JIT::emitPutToCallFrameHeader(RegisterID from, RegisterFile::CallFrameHeaderEntry entry)

{

storePtr(from, Address(callFrameRegister, entry * sizeof(Register)));

}

ALWAYS_INLINE void JIT::emitPutImmediateToCallFrameHeader(void* value, RegisterFile::CallFrameHeaderEntry entry)

{

storePtr(ImmPtr(value), Address(callFrameRegister, entry * sizeof(Register)));

}

ALWAYS_INLINE void JIT::emitGetFromCallFrameHeaderPtr(RegisterFile::CallFrameHeaderEntry entry, RegisterID to, RegisterID from)

{

loadPtr(Address(from, entry * sizeof(Register)), to);

#if !USE(JSVALUE32_64)

killLastResultRegister();

#endif

}

ALWAYS_INLINE void JIT::emitLoadCharacterString(RegisterID src, RegisterID dst, JumpList& failures)

{

failures.append(branchPtr(NotEqual, Address(src), ImmPtr(m_globalData->jsStringVPtr)));

failures.append(branchTest32(NonZero, Address(src, OBJECT_OFFSETOF(JSString, m_fiberCount))));

failures.append(branch32(NotEqual, MacroAssembler::Address(src, ThunkHelpers::jsStringLengthOffset()), Imm32(1)));

loadPtr(MacroAssembler::Address(src, ThunkHelpers::jsStringValueOffset()), dst);

loadPtr(MacroAssembler::Address(dst, ThunkHelpers::stringImplDataOffset()), dst);

load16(MacroAssembler::Address(dst, 0), dst);

}

ALWAYS_INLINE void JIT::emitGetFromCallFrameHeader32(RegisterFile::CallFrameHeaderEntry entry, RegisterID to, RegisterID from)

{

load32(Address(from, entry * sizeof(Register)), to);

#if !USE(JSVALUE32_64)

killLastResultRegister();

#endif

}

ALWAYS_INLINE JIT::Call JIT::emitNakedCall(CodePtr function)

{

ASSERT(m_bytecodeIndex != (unsigned)-1); // This method should only be called during hot/cold path generation, so that m_bytecodeIndex is set.

Call nakedCall = nearCall();

m_calls.append(CallRecord(nakedCall, m_bytecodeIndex, function.executableAddress()));

return nakedCall;

}

#if defined(ASSEMBLER_HAS_CONSTANT_POOL) && ASSEMBLER_HAS_CONSTANT_POOL

ALWAYS_INLINE void JIT::beginUninterruptedSequence(int insnSpace, int constSpace)

{

#if CPU(ARM_TRADITIONAL)

#ifndef NDEBUG

// Ensure the label after the sequence can also fit

insnSpace += sizeof(ARMWord);

constSpace += sizeof(uint64_t);

#endif

ensureSpace(insnSpace, constSpace);

#endif

#if defined(ASSEMBLER_HAS_CONSTANT_POOL) && ASSEMBLER_HAS_CONSTANT_POOL

#ifndef NDEBUG

m_uninterruptedInstructionSequenceBegin = label();

m_uninterruptedConstantSequenceBegin = sizeOfConstantPool();

#endif

#endif

}

ALWAYS_INLINE void JIT::endUninterruptedSequence(int insnSpace, int constSpace)

{

#if defined(ASSEMBLER_HAS_CONSTANT_POOL) && ASSEMBLER_HAS_CONSTANT_POOL

ASSERT(differenceBetween(m_uninterruptedInstructionSequenceBegin, label()) == insnSpace);

ASSERT(sizeOfConstantPool() - m_uninterruptedConstantSequenceBegin == constSpace);

#endif

}

#endif

#if CPU(ARM)

ALWAYS_INLINE void JIT::preserveReturnAddressAfterCall(RegisterID reg)

{

move(linkRegister, reg);

}

ALWAYS_INLINE void JIT::restoreReturnAddressBeforeReturn(RegisterID reg)

{

move(reg, linkRegister);

}

ALWAYS_INLINE void JIT::restoreReturnAddressBeforeReturn(Address address)

{

loadPtr(address, linkRegister);

}

#elif CPU(MIPS)

ALWAYS_INLINE void JIT::preserveReturnAddressAfterCall(RegisterID reg)

{

move(returnAddressRegister, reg);

}

ALWAYS_INLINE void JIT::restoreReturnAddressBeforeReturn(RegisterID reg)

{

move(reg, returnAddressRegister);

}

ALWAYS_INLINE void JIT::restoreReturnAddressBeforeReturn(Address address)

{

loadPtr(address, returnAddressRegister);

}

#else // CPU(X86) || CPU(X86_64)

ALWAYS_INLINE void JIT::preserveReturnAddressAfterCall(RegisterID reg)

{

pop(reg);

}

ALWAYS_INLINE void JIT::restoreReturnAddressBeforeReturn(RegisterID reg)

{

push(reg);

}

ALWAYS_INLINE void JIT::restoreReturnAddressBeforeReturn(Address address)

{

push(address);

}

#endif

#if USE(JIT_STUB_ARGUMENT_VA_LIST)

ALWAYS_INLINE void JIT::restoreArgumentReference()

{

poke(callFrameRegister, OBJECT_OFFSETOF(struct JITStackFrame, callFrame) / sizeof (void*));

}

ALWAYS_INLINE void JIT::restoreArgumentReferenceForTrampoline() {}

#else

ALWAYS_INLINE void JIT::restoreArgumentReference()

{

move(stackPointerRegister, firstArgumentRegister);

poke(callFrameRegister, OBJECT_OFFSETOF(struct JITStackFrame, callFrame) / sizeof (void*));

}

ALWAYS_INLINE void JIT::restoreArgumentReferenceForTrampoline()

{

#if CPU(X86)

// Within a trampoline the return address will be on the stack at this point.

addPtr(Imm32(sizeof(void*)), stackPointerRegister, firstArgumentRegister);

#elif CPU(ARM)

move(stackPointerRegister, firstArgumentRegister);

#endif

// In the trampoline on x86-64, the first argument register is not overwritten.

}

#endif

ALWAYS_INLINE JIT::Jump JIT::checkStructure(RegisterID reg, Structure* structure)

{

return branchPtr(NotEqual, Address(reg, OBJECT_OFFSETOF(JSCell, m_structure)), ImmPtr(structure));

}

ALWAYS_INLINE void JIT::linkSlowCaseIfNotJSCell(Vector<SlowCaseEntry>::iterator& iter, int vReg)

{

if (!m_codeBlock->isKnownNotImmediate(vReg))

linkSlowCase(iter);

}

ALWAYS_INLINE void JIT::addSlowCase(Jump jump)

{

ASSERT(m_bytecodeIndex != (unsigned)-1); // This method should only be called during hot/cold path generation, so that m_bytecodeIndex is set.

m_slowCases.append(SlowCaseEntry(jump, m_bytecodeIndex));

}

ALWAYS_INLINE void JIT::addSlowCase(JumpList jumpList)

{

ASSERT(m_bytecodeIndex != (unsigned)-1); // This method should only be called during hot/cold path generation, so that m_bytecodeIndex is set.

const JumpList::JumpVector& jumpVector = jumpList.jumps();

size_t size = jumpVector.size();

for (size_t i = 0; i < size; ++i)

m_slowCases.append(SlowCaseEntry(jumpVector[i], m_bytecodeIndex));

}

ALWAYS_INLINE void JIT::addJump(Jump jump, int relativeOffset)

{

ASSERT(m_bytecodeIndex != (unsigned)-1); // This method should only be called during hot/cold path generation, so that m_bytecodeIndex is set.

m_jmpTable.append(JumpTable(jump, m_bytecodeIndex + relativeOffset));

}

ALWAYS_INLINE void JIT::emitJumpSlowToHot(Jump jump, int relativeOffset)

{

ASSERT(m_bytecodeIndex != (unsigned)-1); // This method should only be called during hot/cold path generation, so that m_bytecodeIndex is set.

jump.linkTo(m_labels[m_bytecodeIndex + relativeOffset], this);

}

#if ENABLE(SAMPLING_FLAGS)

ALWAYS_INLINE void JIT::setSamplingFlag(int32_t flag)

{

ASSERT(flag >= 1);

ASSERT(flag <= 32);

or32(Imm32(1u << (flag - 1)), AbsoluteAddress(&SamplingFlags::s_flags));

}

ALWAYS_INLINE void JIT::clearSamplingFlag(int32_t flag)

{

ASSERT(flag >= 1);

ASSERT(flag <= 32);

and32(Imm32(~(1u << (flag - 1))), AbsoluteAddress(&SamplingFlags::s_flags));

}

#endif

#if ENABLE(SAMPLING_COUNTERS)

ALWAYS_INLINE void JIT::emitCount(AbstractSamplingCounter& counter, uint32_t count)

{

#if CPU(X86_64) // Or any other 64-bit plattform.

addPtr(Imm32(count), AbsoluteAddress(&counter.m_counter));

#elif CPU(X86) // Or any other little-endian 32-bit plattform.

intptr_t hiWord = reinterpret_cast<intptr_t>(&counter.m_counter) + sizeof(int32_t);

add32(Imm32(count), AbsoluteAddress(&counter.m_counter));

addWithCarry32(Imm32(0), AbsoluteAddress(reinterpret_cast<void*>(hiWord)));

#else

#error "SAMPLING_FLAGS not implemented on this platform."

#endif

}

#endif

#if ENABLE(OPCODE_SAMPLING)

#if CPU(X86_64)

ALWAYS_INLINE void JIT::sampleInstruction(Instruction* instruction, bool inHostFunction)

{

move(ImmPtr(m_interpreter->sampler()->sampleSlot()), X86Registers::ecx);

storePtr(ImmPtr(m_interpreter->sampler()->encodeSample(instruction, inHostFunction)), X86Registers::ecx);

}

#else

ALWAYS_INLINE void JIT::sampleInstruction(Instruction* instruction, bool inHostFunction)

{

storePtr(ImmPtr(m_interpreter->sampler()->encodeSample(instruction, inHostFunction)), m_interpreter->sampler()->sampleSlot());

}

#endif

#endif

#if ENABLE(CODEBLOCK_SAMPLING)

#if CPU(X86_64)

ALWAYS_INLINE void JIT::sampleCodeBlock(CodeBlock* codeBlock)

{

move(ImmPtr(m_interpreter->sampler()->codeBlockSlot()), X86Registers::ecx);

storePtr(ImmPtr(codeBlock), X86Registers::ecx);

}

#else

ALWAYS_INLINE void JIT::sampleCodeBlock(CodeBlock* codeBlock)

{

storePtr(ImmPtr(codeBlock), m_interpreter->sampler()->codeBlockSlot());

}

#endif

#endif

ALWAYS_INLINE bool JIT::isOperandConstantImmediateChar(unsigned src)

{

return m_codeBlock->isConstantRegisterIndex(src) && getConstantOperand(src).isString() && asString(getConstantOperand(src).asCell())->length() == 1;

}

#if USE(JSVALUE32_64)

inline void JIT::emitLoadTag(unsigned index, RegisterID tag)

{

RegisterID mappedTag;

if (getMappedTag(index, mappedTag)) {

move(mappedTag, tag);

unmap(tag);

return;

}

if (m_codeBlock->isConstantRegisterIndex(index)) {

move(Imm32(getConstantOperand(index).tag()), tag);

unmap(tag);

return;

}

load32(tagFor(index), tag);

unmap(tag);

}

inline void JIT::emitLoadPayload(unsigned index, RegisterID payload)

{

RegisterID mappedPayload;

if (getMappedPayload(index, mappedPayload)) {

move(mappedPayload, payload);

unmap(payload);

return;

}

if (m_codeBlock->isConstantRegisterIndex(index)) {

move(Imm32(getConstantOperand(index).payload()), payload);

unmap(payload);

return;

}

load32(payloadFor(index), payload);

unmap(payload);

}

inline void JIT::emitLoad(const JSValue& v, RegisterID tag, RegisterID payload)

{

move(Imm32(v.payload()), payload);

move(Imm32(v.tag()), tag);

}

inline void JIT::emitLoad(unsigned index, RegisterID tag, RegisterID payload, RegisterID base)

{

ASSERT(tag != payload);

if (base == callFrameRegister) {

ASSERT(payload != base);

emitLoadPayload(index, payload);

emitLoadTag(index, tag);

return;

}

if (payload == base) { // avoid stomping base

load32(tagFor(index, base), tag);

load32(payloadFor(index, base), payload);

return;

}

load32(payloadFor(index, base), payload);

load32(tagFor(index, base), tag);

}

inline void JIT::emitLoad2(unsigned index1, RegisterID tag1, RegisterID payload1, unsigned index2, RegisterID tag2, RegisterID payload2)

{

if (isMapped(index1)) {

emitLoad(index1, tag1, payload1);

emitLoad(index2, tag2, payload2);

return;

}

emitLoad(index2, tag2, payload2);

emitLoad(index1, tag1, payload1);

}

inline void JIT::emitLoadDouble(unsigned index, FPRegisterID value)

{

if (m_codeBlock->isConstantRegisterIndex(index)) {

Register& inConstantPool = m_codeBlock->constantRegister(index);

loadDouble(&inConstantPool, value);

} else

loadDouble(addressFor(index), value);

}

inline void JIT::emitLoadInt32ToDouble(unsigned index, FPRegisterID value)

{

if (m_codeBlock->isConstantRegisterIndex(index)) {

Register& inConstantPool = m_codeBlock->constantRegister(index);

char* bytePointer = reinterpret_cast<char*>(&inConstantPool);

convertInt32ToDouble(AbsoluteAddress(bytePointer + OBJECT_OFFSETOF(JSValue, u.asBits.payload)), value);

} else

convertInt32ToDouble(payloadFor(index), value);

}

inline void JIT::emitStore(unsigned index, RegisterID tag, RegisterID payload, RegisterID base)

{

store32(payload, payloadFor(index, base));

store32(tag, tagFor(index, base));

}

inline void JIT::emitStoreInt32(unsigned index, RegisterID payload, bool indexIsInt32)

{

store32(payload, payloadFor(index, callFrameRegister));

if (!indexIsInt32)

store32(Imm32(JSValue::Int32Tag), tagFor(index, callFrameRegister));

}

inline void JIT::emitStoreInt32(unsigned index, Imm32 payload, bool indexIsInt32)

{

store32(payload, payloadFor(index, callFrameRegister));

if (!indexIsInt32)

store32(Imm32(JSValue::Int32Tag), tagFor(index, callFrameRegister));

}

inline void JIT::emitStoreCell(unsigned index, RegisterID payload, bool indexIsCell)

{

store32(payload, payloadFor(index, callFrameRegister));

if (!indexIsCell)

store32(Imm32(JSValue::CellTag), tagFor(index, callFrameRegister));

}

inline void JIT::emitStoreBool(unsigned index, RegisterID tag, bool indexIsBool)

{

if (!indexIsBool)

store32(Imm32(0), payloadFor(index, callFrameRegister));

store32(tag, tagFor(index, callFrameRegister));

}

inline void JIT::emitStoreDouble(unsigned index, FPRegisterID value)

{

storeDouble(value, addressFor(index));

}

inline void JIT::emitStore(unsigned index, const JSValue constant, RegisterID base)

{

store32(Imm32(constant.payload()), payloadFor(index, base));

store32(Imm32(constant.tag()), tagFor(index, base));

}

ALWAYS_INLINE void JIT::emitInitRegister(unsigned dst)

{

emitStore(dst, jsUndefined());

}

inline bool JIT::isLabeled(unsigned bytecodeIndex)

{

for (size_t numberOfJumpTargets = m_codeBlock->numberOfJumpTargets(); m_jumpTargetIndex != numberOfJumpTargets; ++m_jumpTargetIndex) {

unsigned jumpTarget = m_codeBlock->jumpTarget(m_jumpTargetIndex);

if (jumpTarget == bytecodeIndex)

return true;

if (jumpTarget > bytecodeIndex)

return false;

}

return false;

}

inline void JIT::map(unsigned bytecodeIndex, unsigned virtualRegisterIndex, RegisterID tag, RegisterID payload)

{

if (isLabeled(bytecodeIndex))

return;

m_mappedBytecodeIndex = bytecodeIndex;

m_mappedVirtualRegisterIndex = virtualRegisterIndex;

m_mappedTag = tag;

m_mappedPayload = payload;

}

inline void JIT::unmap(RegisterID registerID)

{

if (m_mappedTag == registerID)

m_mappedTag = (RegisterID)-1;

else if (m_mappedPayload == registerID)

m_mappedPayload = (RegisterID)-1;

}

inline void JIT::unmap()

{

m_mappedBytecodeIndex = (unsigned)-1;

m_mappedVirtualRegisterIndex = (unsigned)-1;

m_mappedTag = (RegisterID)-1;

m_mappedPayload = (RegisterID)-1;

}

inline bool JIT::isMapped(unsigned virtualRegisterIndex)

{

if (m_mappedBytecodeIndex != m_bytecodeIndex)

return false;

if (m_mappedVirtualRegisterIndex != virtualRegisterIndex)

return false;

return true;

}

inline bool JIT::getMappedPayload(unsigned virtualRegisterIndex, RegisterID& payload)

{

if (m_mappedBytecodeIndex != m_bytecodeIndex)

return false;

if (m_mappedVirtualRegisterIndex != virtualRegisterIndex)

return false;

if (m_mappedPayload == (RegisterID)-1)

return false;

payload = m_mappedPayload;

return true;

}

inline bool JIT::getMappedTag(unsigned virtualRegisterIndex, RegisterID& tag)

{

if (m_mappedBytecodeIndex != m_bytecodeIndex)

return false;

if (m_mappedVirtualRegisterIndex != virtualRegisterIndex)

return false;

if (m_mappedTag == (RegisterID)-1)

return false;

tag = m_mappedTag;

return true;

}

inline void JIT::emitJumpSlowCaseIfNotJSCell(unsigned virtualRegisterIndex)

{

if (!m_codeBlock->isKnownNotImmediate(virtualRegisterIndex)) {

if (m_codeBlock->isConstantRegisterIndex(virtualRegisterIndex))

addSlowCase(jump());

else

addSlowCase(emitJumpIfNotJSCell(virtualRegisterIndex));

}

}

inline void JIT::emitJumpSlowCaseIfNotJSCell(unsigned virtualRegisterIndex, RegisterID tag)

{

if (!m_codeBlock->isKnownNotImmediate(virtualRegisterIndex)) {

if (m_codeBlock->isConstantRegisterIndex(virtualRegisterIndex))

addSlowCase(jump());

else

addSlowCase(branch32(NotEqual, tag, Imm32(JSValue::CellTag)));

}

}

inline void JIT::linkSlowCaseIfNotJSCell(Vector<SlowCaseEntry>::iterator& iter, unsigned virtualRegisterIndex)

{

if (!m_codeBlock->isKnownNotImmediate(virtualRegisterIndex))

linkSlowCase(iter);

}

ALWAYS_INLINE bool JIT::isOperandConstantImmediateInt(unsigned src)

{

return m_codeBlock->isConstantRegisterIndex(src) && getConstantOperand(src).isInt32();

}

ALWAYS_INLINE bool JIT::getOperandConstantImmediateInt(unsigned op1, unsigned op2, unsigned& op, int32_t& constant)

{

if (isOperandConstantImmediateInt(op1)) {

constant = getConstantOperand(op1).asInt32();

op = op2;

return true;

}

if (isOperandConstantImmediateInt(op2)) {

constant = getConstantOperand(op2).asInt32();

op = op1;

return true;

}

return false;

}

/* Deprecated: Please use JITStubCall instead. */

ALWAYS_INLINE void JIT::emitPutJITStubArg(RegisterID tag, RegisterID payload, unsigned argumentNumber)

{

unsigned argumentStackOffset = (argumentNumber * (sizeof(JSValue) / sizeof(void*))) + JITSTACKFRAME_ARGS_INDEX;

poke(payload, argumentStackOffset);

poke(tag, argumentStackOffset + 1);

}

/* Deprecated: Please use JITStubCall instead. */

ALWAYS_INLINE void JIT::emitPutJITStubArgFromVirtualRegister(unsigned src, unsigned argumentNumber, RegisterID scratch1, RegisterID scratch2)

{

unsigned argumentStackOffset = (argumentNumber * (sizeof(JSValue) / sizeof(void*))) + JITSTACKFRAME_ARGS_INDEX;

if (m_codeBlock->isConstantRegisterIndex(src)) {

JSValue constant = m_codeBlock->getConstant(src);

poke(Imm32(constant.payload()), argumentStackOffset);

poke(Imm32(constant.tag()), argumentStackOffset + 1);

} else {

emitLoad(src, scratch1, scratch2);

poke(scratch2, argumentStackOffset);

poke(scratch1, argumentStackOffset + 1);

}

}

#else // USE(JSVALUE32_64)

ALWAYS_INLINE void JIT::killLastResultRegister()

{

m_lastResultBytecodeRegister = std::numeric_limits<int>::max();

}

// get arg puts an arg from the SF register array into a h/w register

ALWAYS_INLINE void JIT::emitGetVirtualRegister(int src, RegisterID dst)

{

ASSERT(m_bytecodeIndex != (unsigned)-1); // This method should only be called during hot/cold path generation, so that m_bytecodeIndex is set.

// TODO: we want to reuse values that are already in registers if we can - add a register allocator!

if (m_codeBlock->isConstantRegisterIndex(src)) {

JSValue value = m_codeBlock->getConstant(src);

move(ImmPtr(JSValue::encode(value)), dst);

killLastResultRegister();

return;

}

if (src == m_lastResultBytecodeRegister && m_codeBlock->isTemporaryRegisterIndex(src)) {

bool atJumpTarget = false;

while (m_jumpTargetsPosition < m_codeBlock->numberOfJumpTargets() && m_codeBlock->jumpTarget(m_jumpTargetsPosition) <= m_bytecodeIndex) {

if (m_codeBlock->jumpTarget(m_jumpTargetsPosition) == m_bytecodeIndex)

atJumpTarget = true;

++m_jumpTargetsPosition;

}

if (!atJumpTarget) {

// The argument we want is already stored in eax

if (dst != cachedResultRegister)

move(cachedResultRegister, dst);

killLastResultRegister();

return;

}

}

loadPtr(Address(callFrameRegister, src * sizeof(Register)), dst);

killLastResultRegister();

}

ALWAYS_INLINE void JIT::emitGetVirtualRegisters(int src1, RegisterID dst1, int src2, RegisterID dst2)

{

if (src2 == m_lastResultBytecodeRegister) {

emitGetVirtualRegister(src2, dst2);

emitGetVirtualRegister(src1, dst1);

} else {

emitGetVirtualRegister(src1, dst1);

emitGetVirtualRegister(src2, dst2);

}

}

ALWAYS_INLINE int32_t JIT::getConstantOperandImmediateInt(unsigned src)

{

return getConstantOperand(src).asInt32();

}

ALWAYS_INLINE bool JIT::isOperandConstantImmediateInt(unsigned src)

{

return m_codeBlock->isConstantRegisterIndex(src) && getConstantOperand(src).isInt32();

}

ALWAYS_INLINE void JIT::emitPutVirtualRegister(unsigned dst, RegisterID from)

{

storePtr(from, Address(callFrameRegister, dst * sizeof(Register)));

m_lastResultBytecodeRegister = (from == cachedResultRegister) ? dst : std::numeric_limits<int>::max();

}

ALWAYS_INLINE void JIT::emitInitRegister(unsigned dst)

{

storePtr(ImmPtr(JSValue::encode(jsUndefined())), Address(callFrameRegister, dst * sizeof(Register)));

}

ALWAYS_INLINE JIT::Jump JIT::emitJumpIfJSCell(RegisterID reg)

{

#if USE(JSVALUE64)

return branchTestPtr(Zero, reg, tagMaskRegister);

#else

return branchTest32(Zero, reg, Imm32(JSImmediate::TagMask));

#endif

}

ALWAYS_INLINE JIT::Jump JIT::emitJumpIfBothJSCells(RegisterID reg1, RegisterID reg2, RegisterID scratch)

{

move(reg1, scratch);

orPtr(reg2, scratch);

return emitJumpIfJSCell(scratch);

}

ALWAYS_INLINE void JIT::emitJumpSlowCaseIfJSCell(RegisterID reg)

{

addSlowCase(emitJumpIfJSCell(reg));

}

ALWAYS_INLINE JIT::Jump JIT::emitJumpIfNotJSCell(RegisterID reg)

{

#if USE(JSVALUE64)

return branchTestPtr(NonZero, reg, tagMaskRegister);

#else

return branchTest32(NonZero, reg, Imm32(JSImmediate::TagMask));

#endif

}

ALWAYS_INLINE void JIT::emitJumpSlowCaseIfNotJSCell(RegisterID reg)

{

addSlowCase(emitJumpIfNotJSCell(reg));

}

ALWAYS_INLINE void JIT::emitJumpSlowCaseIfNotJSCell(RegisterID reg, int vReg)

{

if (!m_codeBlock->isKnownNotImmediate(vReg))

emitJumpSlowCaseIfNotJSCell(reg);

}

#if USE(JSVALUE64)

inline void JIT::emitLoadDouble(unsigned index, FPRegisterID value)

{

if (m_codeBlock->isConstantRegisterIndex(index)) {

Register& inConstantPool = m_codeBlock->constantRegister(index);

loadDouble(&inConstantPool, value);

} else

loadDouble(addressFor(index), value);

}

inline void JIT::emitLoadInt32ToDouble(unsigned index, FPRegisterID value)

{

if (m_codeBlock->isConstantRegisterIndex(index)) {

Register& inConstantPool = m_codeBlock->constantRegister(index);

convertInt32ToDouble(AbsoluteAddress(&inConstantPool), value);

} else

convertInt32ToDouble(addressFor(index), value);

}

#endif

ALWAYS_INLINE JIT::Jump JIT::emitJumpIfImmediateInteger(RegisterID reg)

{

#if USE(JSVALUE64)

return branchPtr(AboveOrEqual, reg, tagTypeNumberRegister);

#else

return branchTest32(NonZero, reg, Imm32(JSImmediate::TagTypeNumber));

#endif

}

ALWAYS_INLINE JIT::Jump JIT::emitJumpIfNotImmediateInteger(RegisterID reg)

{

#if USE(JSVALUE64)

return branchPtr(Below, reg, tagTypeNumberRegister);

#else

return branchTest32(Zero, reg, Imm32(JSImmediate::TagTypeNumber));

#endif

}

ALWAYS_INLINE JIT::Jump JIT::emitJumpIfNotImmediateIntegers(RegisterID reg1, RegisterID reg2, RegisterID scratch)

{

move(reg1, scratch);

andPtr(reg2, scratch);

return emitJumpIfNotImmediateInteger(scratch);

}

ALWAYS_INLINE void JIT::emitJumpSlowCaseIfNotImmediateInteger(RegisterID reg)

{

addSlowCase(emitJumpIfNotImmediateInteger(reg));

}

ALWAYS_INLINE void JIT::emitJumpSlowCaseIfNotImmediateIntegers(RegisterID reg1, RegisterID reg2, RegisterID scratch)

{

addSlowCase(emitJumpIfNotImmediateIntegers(reg1, reg2, scratch));

}

ALWAYS_INLINE void JIT::emitJumpSlowCaseIfNotImmediateNumber(RegisterID reg)

{

addSlowCase(emitJumpIfNotImmediateNumber(reg));

}

#if !USE(JSVALUE64)

ALWAYS_INLINE void JIT::emitFastArithDeTagImmediate(RegisterID reg)

{

subPtr(Imm32(JSImmediate::TagTypeNumber), reg);

}

ALWAYS_INLINE JIT::Jump JIT::emitFastArithDeTagImmediateJumpIfZero(RegisterID reg)

{

return branchSubPtr(Zero, Imm32(JSImmediate::TagTypeNumber), reg);

}

#endif

ALWAYS_INLINE void JIT::emitFastArithReTagImmediate(RegisterID src, RegisterID dest)

{

#if USE(JSVALUE64)

emitFastArithIntToImmNoCheck(src, dest);

#else

if (src != dest)

move(src, dest);

addPtr(Imm32(JSImmediate::TagTypeNumber), dest);

#endif

}

// operand is int32_t, must have been zero-extended if register is 64-bit.

ALWAYS_INLINE void JIT::emitFastArithIntToImmNoCheck(RegisterID src, RegisterID dest)

{

#if USE(JSVALUE64)

if (src != dest)

move(src, dest);

orPtr(tagTypeNumberRegister, dest);

#else

signExtend32ToPtr(src, dest);

addPtr(dest, dest);

emitFastArithReTagImmediate(dest, dest);

#endif

}

ALWAYS_INLINE void JIT::emitTagAsBoolImmediate(RegisterID reg)

{

lshift32(Imm32(JSImmediate::ExtendedPayloadShift), reg);

or32(Imm32(static_cast<int32_t>(JSImmediate::FullTagTypeBool)), reg);

}

/* Deprecated: Please use JITStubCall instead. */

// get arg puts an arg from the SF register array onto the stack, as an arg to a context threaded function.

ALWAYS_INLINE void JIT::emitPutJITStubArgFromVirtualRegister(unsigned src, unsigned argumentNumber, RegisterID scratch)

{

unsigned argumentStackOffset = (argumentNumber * (sizeof(JSValue) / sizeof(void*))) + JITSTACKFRAME_ARGS_INDEX;

if (m_codeBlock->isConstantRegisterIndex(src)) {

JSValue value = m_codeBlock->getConstant(src);

poke(ImmPtr(JSValue::encode(value)), argumentStackOffset);

} else {

loadPtr(Address(callFrameRegister, src * sizeof(Register)), scratch);

poke(scratch, argumentStackOffset);

}

killLastResultRegister();

}

#endif // USE(JSVALUE32_64)

} // namespace JSC

#endif // ENABLE(JIT)

#endif