Source/JavaScriptCore/jit/JITCall.cpp - WebKit - Git at Google

 /*
  * Copyright (C) 2008, 2013 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(JSVALUE64)
 #include "JIT.h"

 #include "Arguments.h"
 #include "CodeBlock.h"
 #include "JITInlines.h"
 #include "JSArray.h"
 #include "JSFunction.h"
 #include "Interpreter.h"
 #include "JSCInlines.h"
 #include "RepatchBuffer.h"
 #include "ResultType.h"
 #include "SamplingTool.h"
 #include "StackAlignment.h"
 #include "ThunkGenerators.h"
 #include <wtf/StringPrintStream.h>


 namespace JSC {

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

 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()
         && arguments == m_codeBlock->argumentsRegister().offset()
         && !m_codeBlock->symbolTable()->slowArguments();

     if (canOptimize) {
         emitGetVirtualRegister(arguments, regT0);
         slowCase.append(branch64(NotEqual, regT0, TrustedImm64(JSValue::encode(JSValue()))));

         emitGetFromCallFrameHeader32(JSStack::ArgumentCount, regT0);
         slowCase.append(branch32(Above, regT0, TrustedImm32(Arguments::MaxArguments + 1)));
         // regT0: argumentCountIncludingThis
         move(regT0, regT1);
         add64(TrustedImm32(-firstFreeRegister + JSStack::CallFrameHeaderSize), regT1);
         // regT1 now has the required frame size in Register units
         // Round regT1 to next multiple of stackAlignmentRegisters()
         add64(TrustedImm32(stackAlignmentRegisters() - 1), regT1);
         and64(TrustedImm32(~(stackAlignmentRegisters() - 1)), regT1);

         neg64(regT1);
         lshift64(TrustedImm32(3), regT1);
         addPtr(callFrameRegister, regT1);
         // regT1: newCallFrame

         slowCase.append(branchPtr(Above, AbsoluteAddress(m_vm->addressOfJSStackLimit()), regT1));

         // Initialize ArgumentCount.
         store32(regT0, Address(regT1, JSStack::ArgumentCount * static_cast<int>(sizeof(Register)) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload)));

         // Initialize 'this'.
         emitGetVirtualRegister(thisValue, regT2);
         store64(regT2, Address(regT1, CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register))));

         // Copy arguments.
         signExtend32ToPtr(regT0, regT0);
         end.append(branchSub64(Zero, TrustedImm32(1), regT0));
         // regT0: argumentCount

         Label copyLoop = label();
         load64(BaseIndex(callFrameRegister, regT0, TimesEight, CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register))), regT2);
         store64(regT2, BaseIndex(regT1, regT0, TimesEight, CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register))));
         branchSub64(NonZero, TrustedImm32(1), regT0).linkTo(copyLoop, this);

         end.append(jump());
     }

     if (canOptimize)
         slowCase.link(this);

     emitGetVirtualRegister(arguments, regT1);
     callOperation(operationSizeFrameForVarargs, regT1, firstFreeRegister);
     move(returnValueGPR, stackPointerRegister);
     emitGetVirtualRegister(thisValue, regT1);
     emitGetVirtualRegister(arguments, regT2);
     callOperation(operationLoadVarargs, returnValueGPR, regT1, regT2);
     move(returnValueGPR, regT1);

     if (canOptimize)
         end.link(this);

     addPtr(TrustedImm32(sizeof(CallerFrameAndPC)), regT1, stackPointerRegister);
 }

 void JIT::compileCallEval(Instruction* instruction)
 {
     addPtr(TrustedImm32(-static_cast<ptrdiff_t>(sizeof(CallerFrameAndPC))), stackPointerRegister, regT1);
     callOperationNoExceptionCheck(operationCallEval, regT1);

     Jump noException = emitExceptionCheck(InvertedExceptionCheck);
     addPtr(TrustedImm32(stackPointerOffsetFor(m_codeBlock) * sizeof(Register)), callFrameRegister, stackPointerRegister);
     exceptionCheck(jump());

     noException.link(this);
     addSlowCase(branch64(Equal, regT0, TrustedImm64(JSValue::encode(JSValue()))));

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

     sampleCodeBlock(m_codeBlock);

     emitPutCallResult(instruction);
 }

 void JIT::compileCallEvalSlowCase(Instruction* instruction, Vector<SlowCaseEntry>::iterator& iter)
 {
     linkSlowCase(iter);

     load64(Address(stackPointerRegister, sizeof(Register) * JSStack::Callee - sizeof(CallerFrameAndPC)), regT0);
     emitNakedCall(m_vm->getCTIStub(virtualCallThunkGenerator).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:
         - 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()) {
             emitGetVirtualRegister(registerOffset + CallFrame::argumentOffsetIncludingThis(0), regT0);
             Jump done = emitJumpIfNotJSCell(regT0);
             loadPtr(Address(regT0, JSCell::structureOffset()), regT0);
             storePtr(regT0, instruction[6].u.arrayProfile->addressOfLastSeenStructure());
             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 bytecodeOffset = instruction - m_codeBlock->instructions().begin();
     uint32_t locationBits = CallFrame::Location::encodeAsBytecodeOffset(bytecodeOffset);
     store32(TrustedImm32(locationBits), Address(callFrameRegister, JSStack::ArgumentCount * static_cast<int>(sizeof(Register)) + TagOffset));
     emitGetVirtualRegister(callee, regT0); // regT0 holds callee.

     store64(regT0, Address(stackPointerRegister, JSStack::Callee * static_cast<int>(sizeof(Register)) - sizeof(CallerFrameAndPC)));

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

     DataLabelPtr addressOfLinkedFunctionCheck;
     Jump slowCase = branchPtrWithPatch(NotEqual, regT0, addressOfLinkedFunctionCheck, TrustedImmPtr(0));
     addSlowCase(slowCase);

     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)), regT2);
     store64(regT2, Address(MacroAssembler::stackPointerRegister, JSStack::ScopeChain * sizeof(Register) - sizeof(CallerFrameAndPC)));

     m_callStructureStubCompilationInfo[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);

     ThunkGenerator generator = linkThunkGeneratorFor(
         opcodeID == op_construct ? CodeForConstruct : CodeForCall,
         RegisterPreservationNotRequired);

     m_callStructureStubCompilationInfo[callLinkInfoIndex].callReturnLocation = emitNakedCall(m_vm->getCTIStub(generator).code());

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

     sampleCodeBlock(m_codeBlock);

     emitPutCallResult(instruction);
 }

 void JIT::privateCompileClosureCall(CallLinkInfo* callLinkInfo, CodeBlock* calleeCodeBlock, Structure* expectedStructure, ExecutableBase* expectedExecutable, MacroAssemblerCodePtr codePtr)
 {
     JumpList slowCases;

     slowCases.append(branchTestPtr(NonZero, regT0, tagMaskRegister));
     slowCases.append(branchPtr(NotEqual, Address(regT0, JSCell::structureOffset()), TrustedImmPtr(expectedStructure)));
     slowCases.append(branchPtr(NotEqual, Address(regT0, JSFunction::offsetOfExecutable()), TrustedImmPtr(expectedExecutable)));

     loadPtr(Address(regT0, JSFunction::offsetOfScopeChain()), regT1);
     emitPutToCallFrameHeader(regT1, JSStack::ScopeChain);

     Call call = nearCall();
     Jump done = jump();

     slowCases.link(this);
     move(TrustedImmPtr(callLinkInfo->callReturnLocation.executableAddress()), regT2);
     restoreReturnAddressBeforeReturn(regT2);
     Jump slow = jump();

     LinkBuffer patchBuffer(*m_vm, this, m_codeBlock);

     patchBuffer.link(call, FunctionPtr(codePtr.executableAddress()));
     patchBuffer.link(done, callLinkInfo->hotPathOther.labelAtOffset(0));
     patchBuffer.link(slow, CodeLocationLabel(m_vm->getCTIStub(virtualCallThunkGenerator).code()));

     RefPtr<ClosureCallStubRoutine> stubRoutine = adoptRef(new ClosureCallStubRoutine(
         FINALIZE_CODE(
             patchBuffer,
             ("Baseline closure call stub for %s, return point %p, target %p (%s)",
                 toCString(*m_codeBlock).data(),
                 callLinkInfo->hotPathOther.labelAtOffset(0).executableAddress(),
                 codePtr.executableAddress(),
                 toCString(pointerDump(calleeCodeBlock)).data())),
         *m_vm, m_codeBlock->ownerExecutable(), expectedStructure, expectedExecutable,
         callLinkInfo->codeOrigin));

     RepatchBuffer repatchBuffer(m_codeBlock);

     repatchBuffer.replaceWithJump(
         RepatchBuffer::startOfBranchPtrWithPatchOnRegister(callLinkInfo->hotPathBegin),
         CodeLocationLabel(stubRoutine->code().code()));
     repatchBuffer.relink(callLinkInfo->callReturnLocation, m_vm->getCTIStub(virtualCallThunkGenerator).code());

     callLinkInfo->stub = stubRoutine.release();
 }

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

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

 } // namespace JSC

 #endif // USE(JSVALUE64)
 #endif // ENABLE(JIT)
	/*
	* Copyright (C) 2008, 2013 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(JSVALUE64)
	#include "JIT.h"

	#include "Arguments.h"
	#include "CodeBlock.h"
	#include "JITInlines.h"
	#include "JSArray.h"
	#include "JSFunction.h"
	#include "Interpreter.h"
	#include "JSCInlines.h"
	#include "RepatchBuffer.h"
	#include "ResultType.h"
	#include "SamplingTool.h"
	#include "StackAlignment.h"
	#include "ThunkGenerators.h"
	#include <wtf/StringPrintStream.h>


	namespace JSC {

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

	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()
	&& arguments == m_codeBlock->argumentsRegister().offset()
	&& !m_codeBlock->symbolTable()->slowArguments();

	if (canOptimize) {
	emitGetVirtualRegister(arguments, regT0);
	slowCase.append(branch64(NotEqual, regT0, TrustedImm64(JSValue::encode(JSValue()))));

	emitGetFromCallFrameHeader32(JSStack::ArgumentCount, regT0);
	slowCase.append(branch32(Above, regT0, TrustedImm32(Arguments::MaxArguments + 1)));
	// regT0: argumentCountIncludingThis
	move(regT0, regT1);
	add64(TrustedImm32(-firstFreeRegister + JSStack::CallFrameHeaderSize), regT1);
	// regT1 now has the required frame size in Register units
	// Round regT1 to next multiple of stackAlignmentRegisters()
	add64(TrustedImm32(stackAlignmentRegisters() - 1), regT1);
	and64(TrustedImm32(~(stackAlignmentRegisters() - 1)), regT1);

	neg64(regT1);
	lshift64(TrustedImm32(3), regT1);
	addPtr(callFrameRegister, regT1);
	// regT1: newCallFrame

	slowCase.append(branchPtr(Above, AbsoluteAddress(m_vm->addressOfJSStackLimit()), regT1));

	// Initialize ArgumentCount.
	store32(regT0, Address(regT1, JSStack::ArgumentCount * static_cast<int>(sizeof(Register)) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload)));

	// Initialize 'this'.
	emitGetVirtualRegister(thisValue, regT2);
	store64(regT2, Address(regT1, CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register))));

	// Copy arguments.
	signExtend32ToPtr(regT0, regT0);
	end.append(branchSub64(Zero, TrustedImm32(1), regT0));
	// regT0: argumentCount

	Label copyLoop = label();
	load64(BaseIndex(callFrameRegister, regT0, TimesEight, CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register))), regT2);
	store64(regT2, BaseIndex(regT1, regT0, TimesEight, CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register))));
	branchSub64(NonZero, TrustedImm32(1), regT0).linkTo(copyLoop, this);

	end.append(jump());
	}

	if (canOptimize)
	slowCase.link(this);

	emitGetVirtualRegister(arguments, regT1);
	callOperation(operationSizeFrameForVarargs, regT1, firstFreeRegister);
	move(returnValueGPR, stackPointerRegister);
	emitGetVirtualRegister(thisValue, regT1);
	emitGetVirtualRegister(arguments, regT2);
	callOperation(operationLoadVarargs, returnValueGPR, regT1, regT2);
	move(returnValueGPR, regT1);

	if (canOptimize)
	end.link(this);

	addPtr(TrustedImm32(sizeof(CallerFrameAndPC)), regT1, stackPointerRegister);
	}

	void JIT::compileCallEval(Instruction* instruction)
	{
	addPtr(TrustedImm32(-static_cast<ptrdiff_t>(sizeof(CallerFrameAndPC))), stackPointerRegister, regT1);
	callOperationNoExceptionCheck(operationCallEval, regT1);

	Jump noException = emitExceptionCheck(InvertedExceptionCheck);
	addPtr(TrustedImm32(stackPointerOffsetFor(m_codeBlock) * sizeof(Register)), callFrameRegister, stackPointerRegister);
	exceptionCheck(jump());

	noException.link(this);
	addSlowCase(branch64(Equal, regT0, TrustedImm64(JSValue::encode(JSValue()))));

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

	sampleCodeBlock(m_codeBlock);

	emitPutCallResult(instruction);
	}

	void JIT::compileCallEvalSlowCase(Instruction* instruction, Vector<SlowCaseEntry>::iterator& iter)
	{
	linkSlowCase(iter);

	load64(Address(stackPointerRegister, sizeof(Register) * JSStack::Callee - sizeof(CallerFrameAndPC)), regT0);
	emitNakedCall(m_vm->getCTIStub(virtualCallThunkGenerator).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:
	- 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()) {
	emitGetVirtualRegister(registerOffset + CallFrame::argumentOffsetIncludingThis(0), regT0);
	Jump done = emitJumpIfNotJSCell(regT0);
	loadPtr(Address(regT0, JSCell::structureOffset()), regT0);
	storePtr(regT0, instruction[6].u.arrayProfile->addressOfLastSeenStructure());
	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 bytecodeOffset = instruction - m_codeBlock->instructions().begin();
	uint32_t locationBits = CallFrame::Location::encodeAsBytecodeOffset(bytecodeOffset);
	store32(TrustedImm32(locationBits), Address(callFrameRegister, JSStack::ArgumentCount * static_cast<int>(sizeof(Register)) + TagOffset));
	emitGetVirtualRegister(callee, regT0); // regT0 holds callee.

	store64(regT0, Address(stackPointerRegister, JSStack::Callee * static_cast<int>(sizeof(Register)) - sizeof(CallerFrameAndPC)));

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

	DataLabelPtr addressOfLinkedFunctionCheck;
	Jump slowCase = branchPtrWithPatch(NotEqual, regT0, addressOfLinkedFunctionCheck, TrustedImmPtr(0));
	addSlowCase(slowCase);

	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)), regT2);
	store64(regT2, Address(MacroAssembler::stackPointerRegister, JSStack::ScopeChain * sizeof(Register) - sizeof(CallerFrameAndPC)));

	m_callStructureStubCompilationInfo[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);

	ThunkGenerator generator = linkThunkGeneratorFor(
	opcodeID == op_construct ? CodeForConstruct : CodeForCall,
	RegisterPreservationNotRequired);

	m_callStructureStubCompilationInfo[callLinkInfoIndex].callReturnLocation = emitNakedCall(m_vm->getCTIStub(generator).code());

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

	sampleCodeBlock(m_codeBlock);

	emitPutCallResult(instruction);
	}

	void JIT::privateCompileClosureCall(CallLinkInfo* callLinkInfo, CodeBlock* calleeCodeBlock, Structure* expectedStructure, ExecutableBase* expectedExecutable, MacroAssemblerCodePtr codePtr)
	{
	JumpList slowCases;

	slowCases.append(branchTestPtr(NonZero, regT0, tagMaskRegister));
	slowCases.append(branchPtr(NotEqual, Address(regT0, JSCell::structureOffset()), TrustedImmPtr(expectedStructure)));
	slowCases.append(branchPtr(NotEqual, Address(regT0, JSFunction::offsetOfExecutable()), TrustedImmPtr(expectedExecutable)));

	loadPtr(Address(regT0, JSFunction::offsetOfScopeChain()), regT1);
	emitPutToCallFrameHeader(regT1, JSStack::ScopeChain);

	Call call = nearCall();
	Jump done = jump();

	slowCases.link(this);
	move(TrustedImmPtr(callLinkInfo->callReturnLocation.executableAddress()), regT2);
	restoreReturnAddressBeforeReturn(regT2);
	Jump slow = jump();

	LinkBuffer patchBuffer(*m_vm, this, m_codeBlock);

	patchBuffer.link(call, FunctionPtr(codePtr.executableAddress()));
	patchBuffer.link(done, callLinkInfo->hotPathOther.labelAtOffset(0));
	patchBuffer.link(slow, CodeLocationLabel(m_vm->getCTIStub(virtualCallThunkGenerator).code()));

	RefPtr<ClosureCallStubRoutine> stubRoutine = adoptRef(new ClosureCallStubRoutine(
	FINALIZE_CODE(
	patchBuffer,
	("Baseline closure call stub for %s, return point %p, target %p (%s)",
	toCString(*m_codeBlock).data(),
	callLinkInfo->hotPathOther.labelAtOffset(0).executableAddress(),
	codePtr.executableAddress(),
	toCString(pointerDump(calleeCodeBlock)).data())),
	*m_vm, m_codeBlock->ownerExecutable(), expectedStructure, expectedExecutable,
	callLinkInfo->codeOrigin));

	RepatchBuffer repatchBuffer(m_codeBlock);

	repatchBuffer.replaceWithJump(
	RepatchBuffer::startOfBranchPtrWithPatchOnRegister(callLinkInfo->hotPathBegin),
	CodeLocationLabel(stubRoutine->code().code()));
	repatchBuffer.relink(callLinkInfo->callReturnLocation, m_vm->getCTIStub(virtualCallThunkGenerator).code());

	callLinkInfo->stub = stubRoutine.release();
	}

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

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

	} // namespace JSC

	#endif // USE(JSVALUE64)
	#endif // ENABLE(JIT)