Source/JavaScriptCore/jit/JITCall32_64.cpp - third_party/webkit - Git at Google

 /*
  * Copyright (C) 2008, 2013-2015 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #include "config.h"

 #if ENABLE(JIT)
 #if USE(JSVALUE32_64)
 #include "JIT.h"

 #include "CodeBlock.h"
 #include "Interpreter.h"
 #include "JITInlines.h"
 #include "JSArray.h"
 #include "JSFunction.h"
 #include "JSCInlines.h"
 #include "LinkBuffer.h"
 #include "ResultType.h"
 #include "SetupVarargsFrame.h"
 #include "StackAlignment.h"
 #include <wtf/StringPrintStream.h>


 namespace JSC {

 void JIT::emitPutCallResult(Instruction* instruction)
 {
     int dst = instruction[1].u.operand;
     emitValueProfilingSite();
     emitStore(dst, regT1, regT0);
 }

 void JIT::emit_op_ret(Instruction* currentInstruction)
 {
     unsigned dst = currentInstruction[1].u.operand;

     emitLoad(dst, regT1, regT0);

     checkStackPointerAlignment();
     emitRestoreCalleeSaves();
     emitFunctionEpilogue();
     ret();
 }

 void JIT::emitSlow_op_call(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 {
     compileOpCallSlowCase(op_call, currentInstruction, iter, m_callLinkInfoIndex++);
 }

 void JIT::emitSlow_op_tail_call(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 {
     compileOpCallSlowCase(op_tail_call, currentInstruction, iter, m_callLinkInfoIndex++);
 }

 void JIT::emitSlow_op_call_eval(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 {
     compileOpCallSlowCase(op_call_eval, currentInstruction, iter, m_callLinkInfoIndex);
 }

 void JIT::emitSlow_op_call_varargs(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 {
     compileOpCallSlowCase(op_call_varargs, currentInstruction, iter, m_callLinkInfoIndex++);
 }

 void JIT::emitSlow_op_tail_call_varargs(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 {
     compileOpCallSlowCase(op_tail_call_varargs, currentInstruction, iter, m_callLinkInfoIndex++);
 }

 void JIT::emitSlow_op_tail_call_forward_arguments(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 {
     compileOpCallSlowCase(op_tail_call_forward_arguments, currentInstruction, iter, m_callLinkInfoIndex++);
 }

 void JIT::emitSlow_op_construct_varargs(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 {
     compileOpCallSlowCase(op_construct_varargs, currentInstruction, iter, m_callLinkInfoIndex++);
 }

 void JIT::emitSlow_op_construct(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 {
     compileOpCallSlowCase(op_construct, currentInstruction, iter, m_callLinkInfoIndex++);
 }

 void JIT::emit_op_call(Instruction* currentInstruction)
 {
     compileOpCall(op_call, currentInstruction, m_callLinkInfoIndex++);
 }

 void JIT::emit_op_tail_call(Instruction* currentInstruction)
 {
     compileOpCall(op_tail_call, currentInstruction, m_callLinkInfoIndex++);
 }

 void JIT::emit_op_call_eval(Instruction* currentInstruction)
 {
     compileOpCall(op_call_eval, currentInstruction, m_callLinkInfoIndex);
 }

 void JIT::emit_op_call_varargs(Instruction* currentInstruction)
 {
     compileOpCall(op_call_varargs, currentInstruction, m_callLinkInfoIndex++);
 }

 void JIT::emit_op_tail_call_varargs(Instruction* currentInstruction)
 {
     compileOpCall(op_tail_call_varargs, currentInstruction, m_callLinkInfoIndex++);
 }

 void JIT::emit_op_tail_call_forward_arguments(Instruction* currentInstruction)
 {
     compileOpCall(op_tail_call_forward_arguments, currentInstruction, m_callLinkInfoIndex++);
 }

 void JIT::emit_op_construct_varargs(Instruction* currentInstruction)
 {
     compileOpCall(op_construct_varargs, currentInstruction, m_callLinkInfoIndex++);
 }

 void JIT::emit_op_construct(Instruction* currentInstruction)
 {
     compileOpCall(op_construct, currentInstruction, m_callLinkInfoIndex++);
 }

 void JIT::compileSetupVarargsFrame(OpcodeID opcode, 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);
     Z_JITOperation_EJZZ sizeOperation;
     if (opcode == op_tail_call_forward_arguments)
         sizeOperation = operationSizeFrameForForwardArguments;
     else
         sizeOperation = operationSizeFrameForVarargs;
     callOperation(sizeOperation, 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 (opcode == op_tail_call_forward_arguments)
         setupOperation = operationSetupForwardArgumentsFrame;
     else
         setupOperation = operationSetupVarargsFrame;
     callOperation(setupOperation, regT1, regT2, regT4, firstVarArgOffset, regT0);
     move(returnValueGPR, regT1);

     // Profile the argument count.
     load32(Address(regT1, CallFrameSlot::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::compileCallEval(Instruction* instruction)
 {
     addPtr(TrustedImm32(-static_cast<ptrdiff_t>(sizeof(CallerFrameAndPC))), stackPointerRegister, regT1);
     storePtr(callFrameRegister, Address(regT1, CallFrame::callerFrameOffset()));

     addPtr(TrustedImm32(stackPointerOffsetFor(m_codeBlock) * sizeof(Register)), callFrameRegister, stackPointerRegister);

     callOperation(operationCallEval, regT1);

     addSlowCase(branch32(Equal, regT1, TrustedImm32(JSValue::EmptyValueTag)));

     sampleCodeBlock(m_codeBlock);

     emitPutCallResult(instruction);
 }

 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);

     move(TrustedImmPtr(info), regT2);

     emitLoad(CallFrameSlot::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[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.
     */
     CallLinkInfo* info = nullptr;
     if (opcodeID != op_call_eval)
         info = m_codeBlock->addCallLinkInfo();
     if (opcodeID == op_call_varargs || opcodeID == op_construct_varargs || opcodeID == op_tail_call_varargs || opcodeID == op_tail_call_forward_arguments)
         compileSetupVarargsFrame(opcodeID, 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, CallFrameSlot::argumentCount * static_cast<int>(sizeof(Register)) + PayloadOffset - sizeof(CallerFrameAndPC)));
     } // SP holds newCallFrame + sizeof(CallerFrameAndPC), with ArgumentCount initialized.

     uint32_t locationBits = CallSiteIndex(instruction).bits();
     store32(TrustedImm32(locationBits), tagFor(CallFrameSlot::argumentCount, callFrameRegister));
     emitLoad(callee, regT1, regT0); // regT1, regT0 holds callee.

     store32(regT0, Address(stackPointerRegister, CallFrameSlot::callee * static_cast<int>(sizeof(Register)) + PayloadOffset - sizeof(CallerFrameAndPC)));
     store32(regT1, Address(stackPointerRegister, CallFrameSlot::callee * static_cast<int>(sizeof(Register)) + TagOffset - sizeof(CallerFrameAndPC)));

     if (opcodeID == op_call_eval) {
         compileCallEval(instruction);
         return;
     }

     if (opcodeID == op_tail_call || opcodeID == op_tail_call_varargs)
         emitRestoreCalleeSaves();

     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();
     if (opcodeID == op_tail_call || opcodeID == op_tail_call_varargs || opcodeID == op_tail_call_forward_arguments) {
         prepareForTailCallSlow();
         m_callCompilationInfo[callLinkInfoIndex].hotPathOther = emitNakedTailCall();
         return;
     }

     m_callCompilationInfo[callLinkInfoIndex].hotPathOther = emitNakedCall();

     addPtr(TrustedImm32(stackPointerOffsetFor(m_codeBlock) * sizeof(Register)), callFrameRegister, stackPointerRegister);
     checkStackPointerAlignment();

     sampleCodeBlock(m_codeBlock);
     emitPutCallResult(instruction);
 }

 void JIT::compileOpCallSlowCase(OpcodeID opcodeID, Instruction* instruction, Vector<SlowCaseEntry>::iterator& iter, unsigned callLinkInfoIndex)
 {
     if (opcodeID == op_call_eval) {
         compileCallEvalSlowCase(instruction, iter);
         return;
     }

     linkSlowCase(iter);
     linkSlowCase(iter);

     move(TrustedImmPtr(m_callCompilationInfo[callLinkInfoIndex].callLinkInfo), regT2);

     if (opcodeID == op_tail_call || opcodeID == op_tail_call_varargs)
         emitRestoreCalleeSaves();

     m_callCompilationInfo[callLinkInfoIndex].callReturnLocation = emitNakedCall(m_vm->getCTIStub(linkCallThunkGenerator).code());

     if (opcodeID == op_tail_call || opcodeID == op_tail_call_varargs) {
         abortWithReason(JITDidReturnFromTailCall);
         return;
     }

     addPtr(TrustedImm32(stackPointerOffsetFor(m_codeBlock) * sizeof(Register)), callFrameRegister, stackPointerRegister);
     checkStackPointerAlignment();

     sampleCodeBlock(m_codeBlock);
     emitPutCallResult(instruction);
 }

 } // namespace JSC

 #endif // USE(JSVALUE32_64)
 #endif // ENABLE(JIT)
	/*
	* Copyright (C) 2008, 2013-2015 Apple Inc. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
	* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
	* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#include "config.h"

	#if ENABLE(JIT)
	#if USE(JSVALUE32_64)
	#include "JIT.h"

	#include "CodeBlock.h"
	#include "Interpreter.h"
	#include "JITInlines.h"
	#include "JSArray.h"
	#include "JSFunction.h"
	#include "JSCInlines.h"
	#include "LinkBuffer.h"
	#include "ResultType.h"
	#include "SetupVarargsFrame.h"
	#include "StackAlignment.h"
	#include <wtf/StringPrintStream.h>


	namespace JSC {

	void JIT::emitPutCallResult(Instruction* instruction)
	{
	int dst = instruction[1].u.operand;
	emitValueProfilingSite();
	emitStore(dst, regT1, regT0);
	}

	void JIT::emit_op_ret(Instruction* currentInstruction)
	{
	unsigned dst = currentInstruction[1].u.operand;

	emitLoad(dst, regT1, regT0);

	checkStackPointerAlignment();
	emitRestoreCalleeSaves();
	emitFunctionEpilogue();
	ret();
	}

	void JIT::emitSlow_op_call(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
	{
	compileOpCallSlowCase(op_call, currentInstruction, iter, m_callLinkInfoIndex++);
	}

	void JIT::emitSlow_op_tail_call(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
	{
	compileOpCallSlowCase(op_tail_call, currentInstruction, iter, m_callLinkInfoIndex++);
	}

	void JIT::emitSlow_op_call_eval(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
	{
	compileOpCallSlowCase(op_call_eval, currentInstruction, iter, m_callLinkInfoIndex);
	}

	void JIT::emitSlow_op_call_varargs(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
	{
	compileOpCallSlowCase(op_call_varargs, currentInstruction, iter, m_callLinkInfoIndex++);
	}

	void JIT::emitSlow_op_tail_call_varargs(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
	{
	compileOpCallSlowCase(op_tail_call_varargs, currentInstruction, iter, m_callLinkInfoIndex++);
	}

	void JIT::emitSlow_op_tail_call_forward_arguments(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
	{
	compileOpCallSlowCase(op_tail_call_forward_arguments, currentInstruction, iter, m_callLinkInfoIndex++);
	}

	void JIT::emitSlow_op_construct_varargs(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
	{
	compileOpCallSlowCase(op_construct_varargs, currentInstruction, iter, m_callLinkInfoIndex++);
	}

	void JIT::emitSlow_op_construct(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
	{
	compileOpCallSlowCase(op_construct, currentInstruction, iter, m_callLinkInfoIndex++);
	}

	void JIT::emit_op_call(Instruction* currentInstruction)
	{
	compileOpCall(op_call, currentInstruction, m_callLinkInfoIndex++);
	}

	void JIT::emit_op_tail_call(Instruction* currentInstruction)
	{
	compileOpCall(op_tail_call, currentInstruction, m_callLinkInfoIndex++);
	}

	void JIT::emit_op_call_eval(Instruction* currentInstruction)
	{
	compileOpCall(op_call_eval, currentInstruction, m_callLinkInfoIndex);
	}

	void JIT::emit_op_call_varargs(Instruction* currentInstruction)
	{
	compileOpCall(op_call_varargs, currentInstruction, m_callLinkInfoIndex++);
	}

	void JIT::emit_op_tail_call_varargs(Instruction* currentInstruction)
	{
	compileOpCall(op_tail_call_varargs, currentInstruction, m_callLinkInfoIndex++);
	}

	void JIT::emit_op_tail_call_forward_arguments(Instruction* currentInstruction)
	{
	compileOpCall(op_tail_call_forward_arguments, currentInstruction, m_callLinkInfoIndex++);
	}

	void JIT::emit_op_construct_varargs(Instruction* currentInstruction)
	{
	compileOpCall(op_construct_varargs, currentInstruction, m_callLinkInfoIndex++);
	}

	void JIT::emit_op_construct(Instruction* currentInstruction)
	{
	compileOpCall(op_construct, currentInstruction, m_callLinkInfoIndex++);
	}

	void JIT::compileSetupVarargsFrame(OpcodeID opcode, 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);
	Z_JITOperation_EJZZ sizeOperation;
	if (opcode == op_tail_call_forward_arguments)
	sizeOperation = operationSizeFrameForForwardArguments;
	else
	sizeOperation = operationSizeFrameForVarargs;
	callOperation(sizeOperation, 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 (opcode == op_tail_call_forward_arguments)
	setupOperation = operationSetupForwardArgumentsFrame;
	else
	setupOperation = operationSetupVarargsFrame;
	callOperation(setupOperation, regT1, regT2, regT4, firstVarArgOffset, regT0);
	move(returnValueGPR, regT1);

	// Profile the argument count.
	load32(Address(regT1, CallFrameSlot::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::compileCallEval(Instruction* instruction)
	{
	addPtr(TrustedImm32(-static_cast<ptrdiff_t>(sizeof(CallerFrameAndPC))), stackPointerRegister, regT1);
	storePtr(callFrameRegister, Address(regT1, CallFrame::callerFrameOffset()));

	addPtr(TrustedImm32(stackPointerOffsetFor(m_codeBlock) * sizeof(Register)), callFrameRegister, stackPointerRegister);

	callOperation(operationCallEval, regT1);

	addSlowCase(branch32(Equal, regT1, TrustedImm32(JSValue::EmptyValueTag)));

	sampleCodeBlock(m_codeBlock);

	emitPutCallResult(instruction);
	}

	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);

	move(TrustedImmPtr(info), regT2);

	emitLoad(CallFrameSlot::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[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.
	*/
	CallLinkInfo* info = nullptr;
	if (opcodeID != op_call_eval)
	info = m_codeBlock->addCallLinkInfo();
	if (opcodeID == op_call_varargs \|\| opcodeID == op_construct_varargs \|\| opcodeID == op_tail_call_varargs \|\| opcodeID == op_tail_call_forward_arguments)
	compileSetupVarargsFrame(opcodeID, 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, CallFrameSlot::argumentCount * static_cast<int>(sizeof(Register)) + PayloadOffset - sizeof(CallerFrameAndPC)));
	} // SP holds newCallFrame + sizeof(CallerFrameAndPC), with ArgumentCount initialized.

	uint32_t locationBits = CallSiteIndex(instruction).bits();
	store32(TrustedImm32(locationBits), tagFor(CallFrameSlot::argumentCount, callFrameRegister));
	emitLoad(callee, regT1, regT0); // regT1, regT0 holds callee.

	store32(regT0, Address(stackPointerRegister, CallFrameSlot::callee * static_cast<int>(sizeof(Register)) + PayloadOffset - sizeof(CallerFrameAndPC)));
	store32(regT1, Address(stackPointerRegister, CallFrameSlot::callee * static_cast<int>(sizeof(Register)) + TagOffset - sizeof(CallerFrameAndPC)));

	if (opcodeID == op_call_eval) {
	compileCallEval(instruction);
	return;
	}

	if (opcodeID == op_tail_call \|\| opcodeID == op_tail_call_varargs)
	emitRestoreCalleeSaves();

	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();
	if (opcodeID == op_tail_call \|\| opcodeID == op_tail_call_varargs \|\| opcodeID == op_tail_call_forward_arguments) {
	prepareForTailCallSlow();
	m_callCompilationInfo[callLinkInfoIndex].hotPathOther = emitNakedTailCall();
	return;
	}

	m_callCompilationInfo[callLinkInfoIndex].hotPathOther = emitNakedCall();

	addPtr(TrustedImm32(stackPointerOffsetFor(m_codeBlock) * sizeof(Register)), callFrameRegister, stackPointerRegister);
	checkStackPointerAlignment();

	sampleCodeBlock(m_codeBlock);
	emitPutCallResult(instruction);
	}

	void JIT::compileOpCallSlowCase(OpcodeID opcodeID, Instruction* instruction, Vector<SlowCaseEntry>::iterator& iter, unsigned callLinkInfoIndex)
	{
	if (opcodeID == op_call_eval) {
	compileCallEvalSlowCase(instruction, iter);
	return;
	}

	linkSlowCase(iter);
	linkSlowCase(iter);

	move(TrustedImmPtr(m_callCompilationInfo[callLinkInfoIndex].callLinkInfo), regT2);

	if (opcodeID == op_tail_call \|\| opcodeID == op_tail_call_varargs)
	emitRestoreCalleeSaves();

	m_callCompilationInfo[callLinkInfoIndex].callReturnLocation = emitNakedCall(m_vm->getCTIStub(linkCallThunkGenerator).code());

	if (opcodeID == op_tail_call \|\| opcodeID == op_tail_call_varargs) {
	abortWithReason(JITDidReturnFromTailCall);
	return;
	}

	addPtr(TrustedImm32(stackPointerOffsetFor(m_codeBlock) * sizeof(Register)), callFrameRegister, stackPointerRegister);
	checkStackPointerAlignment();

	sampleCodeBlock(m_codeBlock);
	emitPutCallResult(instruction);
	}

	} // namespace JSC

	#endif // USE(JSVALUE32_64)
	#endif // ENABLE(JIT)