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

 /*
  * Copyright (C) 2008, 2013-2016 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 "CallFrameShuffler.h"
 #include "CodeBlock.h"
 #include "JITInlines.h"
 #include "JSArray.h"
 #include "JSFunction.h"
 #include "Interpreter.h"
 #include "JSCInlines.h"
 #include "LinkBuffer.h"
 #include "ResultType.h"
 #include "SetupVarargsFrame.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::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;

     emitGetVirtualRegister(arguments, regT1);
     Z_JITOperation_EJZZ sizeOperation;
     if (opcode == op_tail_call_forward_arguments)
         sizeOperation = operationSizeFrameForForwardArguments;
     else
         sizeOperation = operationSizeFrameForVarargs;
     callOperation(sizeOperation, regT1, -firstFreeRegister, firstVarArgOffset);
     move(TrustedImm32(-firstFreeRegister), regT1);
     emitSetVarargsFrame(*this, returnValueGPR, false, regT1, regT1);
     addPtr(TrustedImm32(-(sizeof(CallerFrameAndPC) + WTF::roundUpToMultipleOf(stackAlignmentBytes(), 5 * sizeof(void*)))), regT1, stackPointerRegister);
     emitGetVirtualRegister(arguments, regT2);
     F_JITOperation_EFJZZ setupOperation;
     if (opcode == op_tail_call_forward_arguments)
         setupOperation = operationSetupForwardArgumentsFrame;
     else
         setupOperation = operationSetupVarargsFrame;
     callOperation(setupOperation, regT1, regT2, 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'.
     emitGetVirtualRegister(thisValue, regT0);
     store64(regT0, Address(regT1, 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);
     checkStackPointerAlignment();

     callOperation(operationCallEval, regT1);

     addSlowCase(branch64(Equal, regT0, TrustedImm64(JSValue::encode(JSValue()))));

     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);

     load64(Address(stackPointerRegister, sizeof(Register) * CallFrameSlot::callee - sizeof(CallerFrameAndPC)), regT0);
     emitDumbVirtualCall(info);
     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.
     */
     COMPILE_ASSERT(OPCODE_LENGTH(op_call) == OPCODE_LENGTH(op_construct), call_and_construct_opcodes_must_be_same_length);
     COMPILE_ASSERT(OPCODE_LENGTH(op_call) == OPCODE_LENGTH(op_call_varargs), call_and_call_varargs_opcodes_must_be_same_length);
     COMPILE_ASSERT(OPCODE_LENGTH(op_call) == OPCODE_LENGTH(op_construct_varargs), call_and_construct_varargs_opcodes_must_be_same_length);
     COMPILE_ASSERT(OPCODE_LENGTH(op_call) == OPCODE_LENGTH(op_tail_call), call_and_tail_call_opcodes_must_be_same_length);
     COMPILE_ASSERT(OPCODE_LENGTH(op_call) == OPCODE_LENGTH(op_tail_call_varargs), call_and_tail_call_varargs_opcodes_must_be_same_length);
     COMPILE_ASSERT(OPCODE_LENGTH(op_call) == OPCODE_LENGTH(op_tail_call_forward_arguments), call_and_tail_call_forward_arguments_opcodes_must_be_same_length);

     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()) {
             emitGetVirtualRegister(registerOffset + CallFrame::argumentOffsetIncludingThis(0), regT0);
             Jump done = emitJumpIfNotJSCell(regT0);
             load32(Address(regT0, JSCell::structureIDOffset()), regT0);
             store32(regT0, 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 bytecodeOffset = instruction - m_codeBlock->instructions().begin();
     uint32_t locationBits = CallSiteIndex(bytecodeOffset).bits();
     store32(TrustedImm32(locationBits), Address(callFrameRegister, CallFrameSlot::argumentCount * static_cast<int>(sizeof(Register)) + TagOffset));

     emitGetVirtualRegister(callee, regT0); // regT0 holds callee.
     store64(regT0, Address(stackPointerRegister, CallFrameSlot::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_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;

     if (opcodeID == op_tail_call) {
         CallFrameShuffleData shuffleData;
         shuffleData.tagTypeNumber = GPRInfo::tagTypeNumberRegister;
         shuffleData.numLocals =
             instruction[4].u.operand - sizeof(CallerFrameAndPC) / sizeof(Register);
         shuffleData.args.resize(instruction[3].u.operand);
         for (int i = 0; i < instruction[3].u.operand; ++i) {
             shuffleData.args[i] =
                 ValueRecovery::displacedInJSStack(
                     virtualRegisterForArgument(i) - instruction[4].u.operand,
                     DataFormatJS);
         }
         shuffleData.callee =
             ValueRecovery::inGPR(regT0, DataFormatJS);
         shuffleData.setupCalleeSaveRegisters(m_codeBlock);
         info->setFrameShuffleData(shuffleData);
         CallFrameShuffler(*this, shuffleData).prepareForTailCall();
         m_callCompilationInfo[callLinkInfoIndex].hotPathOther = emitNakedTailCall();
         return;
     }

     if (opcodeID == op_tail_call_varargs || opcodeID == op_tail_call_forward_arguments) {
         emitRestoreCalleeSaves();
         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);

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

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

     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);
 }

 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::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++);
 }

 } // namespace JSC

 #endif // USE(JSVALUE64)
 #endif // ENABLE(JIT)
	/*
	* Copyright (C) 2008, 2013-2016 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 "CallFrameShuffler.h"
	#include "CodeBlock.h"
	#include "JITInlines.h"
	#include "JSArray.h"
	#include "JSFunction.h"
	#include "Interpreter.h"
	#include "JSCInlines.h"
	#include "LinkBuffer.h"
	#include "ResultType.h"
	#include "SetupVarargsFrame.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::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;

	emitGetVirtualRegister(arguments, regT1);
	Z_JITOperation_EJZZ sizeOperation;
	if (opcode == op_tail_call_forward_arguments)
	sizeOperation = operationSizeFrameForForwardArguments;
	else
	sizeOperation = operationSizeFrameForVarargs;
	callOperation(sizeOperation, regT1, -firstFreeRegister, firstVarArgOffset);
	move(TrustedImm32(-firstFreeRegister), regT1);
	emitSetVarargsFrame(*this, returnValueGPR, false, regT1, regT1);
	addPtr(TrustedImm32(-(sizeof(CallerFrameAndPC) + WTF::roundUpToMultipleOf(stackAlignmentBytes(), 5 * sizeof(void*)))), regT1, stackPointerRegister);
	emitGetVirtualRegister(arguments, regT2);
	F_JITOperation_EFJZZ setupOperation;
	if (opcode == op_tail_call_forward_arguments)
	setupOperation = operationSetupForwardArgumentsFrame;
	else
	setupOperation = operationSetupVarargsFrame;
	callOperation(setupOperation, regT1, regT2, 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'.
	emitGetVirtualRegister(thisValue, regT0);
	store64(regT0, Address(regT1, 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);
	checkStackPointerAlignment();

	callOperation(operationCallEval, regT1);

	addSlowCase(branch64(Equal, regT0, TrustedImm64(JSValue::encode(JSValue()))));

	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);

	load64(Address(stackPointerRegister, sizeof(Register) * CallFrameSlot::callee - sizeof(CallerFrameAndPC)), regT0);
	emitDumbVirtualCall(info);
	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.
	*/
	COMPILE_ASSERT(OPCODE_LENGTH(op_call) == OPCODE_LENGTH(op_construct), call_and_construct_opcodes_must_be_same_length);
	COMPILE_ASSERT(OPCODE_LENGTH(op_call) == OPCODE_LENGTH(op_call_varargs), call_and_call_varargs_opcodes_must_be_same_length);
	COMPILE_ASSERT(OPCODE_LENGTH(op_call) == OPCODE_LENGTH(op_construct_varargs), call_and_construct_varargs_opcodes_must_be_same_length);
	COMPILE_ASSERT(OPCODE_LENGTH(op_call) == OPCODE_LENGTH(op_tail_call), call_and_tail_call_opcodes_must_be_same_length);
	COMPILE_ASSERT(OPCODE_LENGTH(op_call) == OPCODE_LENGTH(op_tail_call_varargs), call_and_tail_call_varargs_opcodes_must_be_same_length);
	COMPILE_ASSERT(OPCODE_LENGTH(op_call) == OPCODE_LENGTH(op_tail_call_forward_arguments), call_and_tail_call_forward_arguments_opcodes_must_be_same_length);

	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()) {
	emitGetVirtualRegister(registerOffset + CallFrame::argumentOffsetIncludingThis(0), regT0);
	Jump done = emitJumpIfNotJSCell(regT0);
	load32(Address(regT0, JSCell::structureIDOffset()), regT0);
	store32(regT0, 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 bytecodeOffset = instruction - m_codeBlock->instructions().begin();
	uint32_t locationBits = CallSiteIndex(bytecodeOffset).bits();
	store32(TrustedImm32(locationBits), Address(callFrameRegister, CallFrameSlot::argumentCount * static_cast<int>(sizeof(Register)) + TagOffset));

	emitGetVirtualRegister(callee, regT0); // regT0 holds callee.
	store64(regT0, Address(stackPointerRegister, CallFrameSlot::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_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;

	if (opcodeID == op_tail_call) {
	CallFrameShuffleData shuffleData;
	shuffleData.tagTypeNumber = GPRInfo::tagTypeNumberRegister;
	shuffleData.numLocals =
	instruction[4].u.operand - sizeof(CallerFrameAndPC) / sizeof(Register);
	shuffleData.args.resize(instruction[3].u.operand);
	for (int i = 0; i < instruction[3].u.operand; ++i) {
	shuffleData.args[i] =
	ValueRecovery::displacedInJSStack(
	virtualRegisterForArgument(i) - instruction[4].u.operand,
	DataFormatJS);
	}
	shuffleData.callee =
	ValueRecovery::inGPR(regT0, DataFormatJS);
	shuffleData.setupCalleeSaveRegisters(m_codeBlock);
	info->setFrameShuffleData(shuffleData);
	CallFrameShuffler(*this, shuffleData).prepareForTailCall();
	m_callCompilationInfo[callLinkInfoIndex].hotPathOther = emitNakedTailCall();
	return;
	}

	if (opcodeID == op_tail_call_varargs \|\| opcodeID == op_tail_call_forward_arguments) {
	emitRestoreCalleeSaves();
	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);

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

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

	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);
	}

	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::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++);
	}

	} // namespace JSC

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