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

 /*
  * 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.
  */

 #include "config.h"

 #if ENABLE(JIT)
 #if USE(JSVALUE64)
 #include "JIT.h"

 #include "Arguments.h"
 #include "CodeBlock.h"
 #include "JITInlines.h"
 #include "JITStubCall.h"
 #include "JSArray.h"
 #include "JSFunction.h"
 #include "Interpreter.h"
 #include "ResultType.h"
 #include "SamplingTool.h"

 #ifndef NDEBUG
 #include <stdio.h>
 #endif

 using namespace std;

 namespace JSC {

 void JIT::emit_op_call_put_result(Instruction* instruction)
 {
     int dst = instruction[1].u.operand;
     emitValueProfilingSite();
     emitPutVirtualRegister(dst);
     if (canBeOptimized())
         killLastResultRegister(); // Make lastResultRegister tracking simpler in the DFG.
 }

 void JIT::compileLoadVarargs(Instruction* instruction)
 {
     int thisValue = instruction[2].u.operand;
     int arguments = instruction[3].u.operand;
     int firstFreeRegister = instruction[4].u.operand;

     killLastResultRegister();

     JumpList slowCase;
     JumpList end;
     bool canOptimize = m_codeBlock->usesArguments()
         && arguments == m_codeBlock->argumentsRegister()
         && !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);
         add32(TrustedImm32(firstFreeRegister + JSStack::CallFrameHeaderSize), regT1);
         lshift32(TrustedImm32(3), regT1);
         addPtr(callFrameRegister, regT1);
         // regT1: newCallFrame

         slowCase.append(branchPtr(Below, AbsoluteAddress(m_globalData->interpreter->stack().addressOfEnd()), 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.
         neg32(regT0);
         signExtend32ToPtr(regT0, regT0);
         end.append(branchAdd64(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))));
         branchAdd64(NonZero, TrustedImm32(1), regT0).linkTo(copyLoop, this);

         end.append(jump());
     }

     if (canOptimize)
         slowCase.link(this);

     JITStubCall stubCall(this, cti_op_load_varargs);
     stubCall.addArgument(thisValue, regT0);
     stubCall.addArgument(arguments, regT0);
     stubCall.addArgument(Imm32(firstFreeRegister));
     stubCall.call(regT1);

     if (canOptimize)
         end.link(this);
 }

 void JIT::compileCallEval()
 {
     JITStubCall stubCall(this, cti_op_call_eval); // Initializes ScopeChain; ReturnPC; CodeBlock.
     stubCall.call();
     addSlowCase(branch64(Equal, regT0, TrustedImm64(JSValue::encode(JSValue()))));
     emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, callFrameRegister);

     sampleCodeBlock(m_codeBlock);
 }

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

     emitGetFromCallFrameHeader64(JSStack::Callee, regT0);
     emitNakedCall(m_globalData->jitStubs->ctiVirtualCall());

     sampleCodeBlock(m_codeBlock);
 }

 void JIT::compileOpCall(OpcodeID opcodeID, Instruction* instruction, unsigned callLinkInfoIndex)
 {
     int callee = instruction[1].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[2].u.operand;
         int registerOffset = instruction[3].u.operand;

         if (opcodeID == op_call && canBeOptimized()) {
             emitGetVirtualRegister(registerOffset + CallFrame::argumentOffsetIncludingThis(0), regT0);
             Jump done = emitJumpIfNotJSCell(regT0);
             loadPtr(Address(regT0, JSCell::structureOffset()), regT0);
             storePtr(regT0, instruction[5].u.arrayProfile->addressOfLastSeenStructure());
             done.link(this);
         }

         addPtr(TrustedImm32(registerOffset * sizeof(Register)), callFrameRegister, regT1);
         store32(TrustedImm32(argCount), Address(regT1, JSStack::ArgumentCount * static_cast<int>(sizeof(Register)) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload)));
     } // regT1 holds newCallFrame with ArgumentCount initialized.

     store32(TrustedImm32(instruction - m_codeBlock->instructions().begin()), Address(callFrameRegister, JSStack::ArgumentCount * static_cast<int>(sizeof(Register)) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag)));
     emitGetVirtualRegister(callee, regT0); // regT0 holds callee.

     store64(callFrameRegister, Address(regT1, JSStack::CallerFrame * static_cast<int>(sizeof(Register))));
     store64(regT0, Address(regT1, JSStack::Callee * static_cast<int>(sizeof(Register))));
     move(regT1, callFrameRegister);

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

     DataLabelPtr addressOfLinkedFunctionCheck;
     BEGIN_UNINTERRUPTED_SEQUENCE(sequenceOpCall);
     Jump slowCase = branchPtrWithPatch(NotEqual, regT0, addressOfLinkedFunctionCheck, TrustedImmPtr(0));
     END_UNINTERRUPTED_SEQUENCE(sequenceOpCall);
     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)), regT1);
     emitPutToCallFrameHeader(regT1, JSStack::ScopeChain);
     m_callStructureStubCompilationInfo[callLinkInfoIndex].hotPathOther = emitNakedCall();

     sampleCodeBlock(m_codeBlock);
 }

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

     linkSlowCase(iter);

     m_callStructureStubCompilationInfo[callLinkInfoIndex].callReturnLocation = emitNakedCall(opcodeID == op_construct ? m_globalData->jitStubs->ctiVirtualConstructLink() : m_globalData->jitStubs->ctiVirtualCallLink());

     sampleCodeBlock(m_codeBlock);
 }

 } // namespace JSC

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

	#include "config.h"

	#if ENABLE(JIT)
	#if USE(JSVALUE64)
	#include "JIT.h"

	#include "Arguments.h"
	#include "CodeBlock.h"
	#include "JITInlines.h"
	#include "JITStubCall.h"
	#include "JSArray.h"
	#include "JSFunction.h"
	#include "Interpreter.h"
	#include "ResultType.h"
	#include "SamplingTool.h"

	#ifndef NDEBUG
	#include <stdio.h>
	#endif

	using namespace std;

	namespace JSC {

	void JIT::emit_op_call_put_result(Instruction* instruction)
	{
	int dst = instruction[1].u.operand;
	emitValueProfilingSite();
	emitPutVirtualRegister(dst);
	if (canBeOptimized())
	killLastResultRegister(); // Make lastResultRegister tracking simpler in the DFG.
	}

	void JIT::compileLoadVarargs(Instruction* instruction)
	{
	int thisValue = instruction[2].u.operand;
	int arguments = instruction[3].u.operand;
	int firstFreeRegister = instruction[4].u.operand;

	killLastResultRegister();

	JumpList slowCase;
	JumpList end;
	bool canOptimize = m_codeBlock->usesArguments()
	&& arguments == m_codeBlock->argumentsRegister()
	&& !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);
	add32(TrustedImm32(firstFreeRegister + JSStack::CallFrameHeaderSize), regT1);
	lshift32(TrustedImm32(3), regT1);
	addPtr(callFrameRegister, regT1);
	// regT1: newCallFrame

	slowCase.append(branchPtr(Below, AbsoluteAddress(m_globalData->interpreter->stack().addressOfEnd()), 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.
	neg32(regT0);
	signExtend32ToPtr(regT0, regT0);
	end.append(branchAdd64(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))));
	branchAdd64(NonZero, TrustedImm32(1), regT0).linkTo(copyLoop, this);

	end.append(jump());
	}

	if (canOptimize)
	slowCase.link(this);

	JITStubCall stubCall(this, cti_op_load_varargs);
	stubCall.addArgument(thisValue, regT0);
	stubCall.addArgument(arguments, regT0);
	stubCall.addArgument(Imm32(firstFreeRegister));
	stubCall.call(regT1);

	if (canOptimize)
	end.link(this);
	}

	void JIT::compileCallEval()
	{
	JITStubCall stubCall(this, cti_op_call_eval); // Initializes ScopeChain; ReturnPC; CodeBlock.
	stubCall.call();
	addSlowCase(branch64(Equal, regT0, TrustedImm64(JSValue::encode(JSValue()))));
	emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, callFrameRegister);

	sampleCodeBlock(m_codeBlock);
	}

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

	emitGetFromCallFrameHeader64(JSStack::Callee, regT0);
	emitNakedCall(m_globalData->jitStubs->ctiVirtualCall());

	sampleCodeBlock(m_codeBlock);
	}

	void JIT::compileOpCall(OpcodeID opcodeID, Instruction* instruction, unsigned callLinkInfoIndex)
	{
	int callee = instruction[1].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[2].u.operand;
	int registerOffset = instruction[3].u.operand;

	if (opcodeID == op_call && canBeOptimized()) {
	emitGetVirtualRegister(registerOffset + CallFrame::argumentOffsetIncludingThis(0), regT0);
	Jump done = emitJumpIfNotJSCell(regT0);
	loadPtr(Address(regT0, JSCell::structureOffset()), regT0);
	storePtr(regT0, instruction[5].u.arrayProfile->addressOfLastSeenStructure());
	done.link(this);
	}

	addPtr(TrustedImm32(registerOffset * sizeof(Register)), callFrameRegister, regT1);
	store32(TrustedImm32(argCount), Address(regT1, JSStack::ArgumentCount * static_cast<int>(sizeof(Register)) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload)));
	} // regT1 holds newCallFrame with ArgumentCount initialized.

	store32(TrustedImm32(instruction - m_codeBlock->instructions().begin()), Address(callFrameRegister, JSStack::ArgumentCount * static_cast<int>(sizeof(Register)) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag)));
	emitGetVirtualRegister(callee, regT0); // regT0 holds callee.

	store64(callFrameRegister, Address(regT1, JSStack::CallerFrame * static_cast<int>(sizeof(Register))));
	store64(regT0, Address(regT1, JSStack::Callee * static_cast<int>(sizeof(Register))));
	move(regT1, callFrameRegister);

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

	DataLabelPtr addressOfLinkedFunctionCheck;
	BEGIN_UNINTERRUPTED_SEQUENCE(sequenceOpCall);
	Jump slowCase = branchPtrWithPatch(NotEqual, regT0, addressOfLinkedFunctionCheck, TrustedImmPtr(0));
	END_UNINTERRUPTED_SEQUENCE(sequenceOpCall);
	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)), regT1);
	emitPutToCallFrameHeader(regT1, JSStack::ScopeChain);
	m_callStructureStubCompilationInfo[callLinkInfoIndex].hotPathOther = emitNakedCall();

	sampleCodeBlock(m_codeBlock);
	}

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

	linkSlowCase(iter);

	m_callStructureStubCompilationInfo[callLinkInfoIndex].callReturnLocation = emitNakedCall(opcodeID == op_construct ? m_globalData->jitStubs->ctiVirtualConstructLink() : m_globalData->jitStubs->ctiVirtualCallLink());

	sampleCodeBlock(m_codeBlock);
	}

	} // namespace JSC

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