[apple/javascriptcore.git] / jit / JITCall.cpp

/*
 * Copyright (C) 2008, 2013, 2014 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 "LinkBuffer.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;
    int firstVarArgOffset = instruction[6].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);
        if (firstVarArgOffset) {
            Jump sufficientArguments = branch32(GreaterThan, regT0, TrustedImm32(firstVarArgOffset + 1));
            move(TrustedImm32(1), regT0);
            Jump endVarArgs = jump();
            sufficientArguments.link(this);
            sub32(TrustedImm32(firstVarArgOffset), regT0);
            endVarArgs.link(this);
        }
        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->addressOfStackLimit()), 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() + firstVarArgOffset) * 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, firstVarArgOffset);
    move(returnValueGPR, stackPointerRegister);
    emitGetVirtualRegister(thisValue, regT1);
    emitGetVirtualRegister(arguments, regT2);
    callOperation(operationLoadVarargs, returnValueGPR, regT1, regT2, firstVarArgOffset);
    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);
    move(TrustedImmPtr(&CallLinkInfo::dummy()), regT2);
    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.
    */
    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);
    if (opcodeID == op_call_varargs || opcodeID == op_construct_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);
            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, 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_callCompilationInfo.size() == callLinkInfoIndex);
    CallLinkInfo* info = m_codeBlock->addCallLinkInfo();
    info->callType = CallLinkInfo::callTypeFor(opcodeID);
    info->codeOrigin = CodeOrigin(m_bytecodeOffset);
    info->calleeGPR = regT0;
    m_callCompilationInfo.append(CallCompilationInfo());
    m_callCompilationInfo[callLinkInfoIndex].hotPathBegin = addressOfLinkedFunctionCheck;
    m_callCompilationInfo[callLinkInfoIndex].callLinkInfo = info;

    loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_scope)), regT2);
    store64(regT2, Address(MacroAssembler::stackPointerRegister, JSStack::ScopeChain * sizeof(Register) - sizeof(CallerFrameAndPC)));

    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);

    ThunkGenerator generator = linkThunkGeneratorFor(
        (opcodeID == op_construct || opcodeID == op_construct_varargs) ? CodeForConstruct : CodeForCall,
        RegisterPreservationNotRequired);
    
    move(TrustedImmPtr(m_callCompilationInfo[callLinkInfoIndex].callLinkInfo), regT2);
    m_callCompilationInfo[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(branchStructure(NotEqual, Address(regT0, JSCell::structureIDOffset()), 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_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_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_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)
Commit	Line	Data
9dae56ea	1	/*
81345200	2	* Copyright (C) 2008, 2013, 2014 Apple Inc. All rights reserved.
9dae56ea A	3	*
	4	* Redistribution and use in source and binary forms, with or without
	5	* modification, are permitted provided that the following conditions
	6	* are met:
	7	* 1. Redistributions of source code must retain the above copyright
	8	* notice, this list of conditions and the following disclaimer.
	9	* 2. Redistributions in binary form must reproduce the above copyright
	10	* notice, this list of conditions and the following disclaimer in the
	11	* documentation and/or other materials provided with the distribution.
	12	*
	13	* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
	14	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	15	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	16	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
	17	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	18	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
	19	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
	20	* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
	21	* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	22	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	23	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	24	*/
	25
	26	#include "config.h"
9dae56ea A	27
9dae56ea A	28	#if ENABLE(JIT)
14957cd0 A	29	#if USE(JSVALUE64)
14957cd0 A	30	#include "JIT.h"
9dae56ea	31
6fe7ccc8	32	#include "Arguments.h"
9dae56ea	33	#include "CodeBlock.h"
93a37866	34	#include "JITInlines.h"
9dae56ea A	35	#include "JSArray.h"
	36	#include "JSFunction.h"
	37	#include "Interpreter.h"
81345200 A	38	#include "JSCInlines.h"
81345200 A	39	#include "LinkBuffer.h"
93a37866	40	#include "RepatchBuffer.h"
9dae56ea A	41	#include "ResultType.h"
9dae56ea A	42	#include "SamplingTool.h"
81345200	43	#include "StackAlignment.h"
93a37866 A	44	#include "ThunkGenerators.h"
93a37866 A	45	#include <wtf/StringPrintStream.h>
9dae56ea	46
9dae56ea A	47
	48	namespace JSC {
	49
81345200	50	void JIT::emitPutCallResult(Instruction* instruction)
ba379fdc A	51	{
ba379fdc A	52	int dst = instruction[1].u.operand;
6fe7ccc8	53	emitValueProfilingSite();
14957cd0	54	emitPutVirtualRegister(dst);
9dae56ea A	55	}
9dae56ea A	56
6fe7ccc8	57	void JIT::compileLoadVarargs(Instruction* instruction)
ba379fdc	58	{
81345200 A	59	int thisValue = instruction[3].u.operand;
	60	int arguments = instruction[4].u.operand;
	61	int firstFreeRegister = instruction[5].u.operand;
	62	int firstVarArgOffset = instruction[6].u.operand;
ba379fdc	63
6fe7ccc8 A	64	JumpList slowCase;
6fe7ccc8 A	65	JumpList end;
93a37866	66	bool canOptimize = m_codeBlock->usesArguments()
81345200	67	&& arguments == m_codeBlock->argumentsRegister().offset()
93a37866 A	68	&& !m_codeBlock->symbolTable()->slowArguments();
	69
	70	if (canOptimize) {
6fe7ccc8	71	emitGetVirtualRegister(arguments, regT0);
93a37866	72	slowCase.append(branch64(NotEqual, regT0, TrustedImm64(JSValue::encode(JSValue()))));
14957cd0	73
93a37866	74	emitGetFromCallFrameHeader32(JSStack::ArgumentCount, regT0);
81345200 A	75	if (firstVarArgOffset) {
	76	Jump sufficientArguments = branch32(GreaterThan, regT0, TrustedImm32(firstVarArgOffset + 1));
	77	move(TrustedImm32(1), regT0);
	78	Jump endVarArgs = jump();
	79	sufficientArguments.link(this);
	80	sub32(TrustedImm32(firstVarArgOffset), regT0);
	81	endVarArgs.link(this);
	82	}
6fe7ccc8 A	83	slowCase.append(branch32(Above, regT0, TrustedImm32(Arguments::MaxArguments + 1)));
6fe7ccc8 A	84	// regT0: argumentCountIncludingThis
6fe7ccc8	85	move(regT0, regT1);
81345200 A	86	add64(TrustedImm32(-firstFreeRegister + JSStack::CallFrameHeaderSize), regT1);
	87	// regT1 now has the required frame size in Register units
	88	// Round regT1 to next multiple of stackAlignmentRegisters()
	89	add64(TrustedImm32(stackAlignmentRegisters() - 1), regT1);
	90	and64(TrustedImm32(~(stackAlignmentRegisters() - 1)), regT1);
	91
	92	neg64(regT1);
	93	lshift64(TrustedImm32(3), regT1);
6fe7ccc8 A	94	addPtr(callFrameRegister, regT1);
6fe7ccc8 A	95	// regT1: newCallFrame
ba379fdc	96
81345200	97	slowCase.append(branchPtr(Above, AbsoluteAddress(m_vm->addressOfStackLimit()), regT1));
9dae56ea	98
6fe7ccc8	99	// Initialize ArgumentCount.
93a37866	100	store32(regT0, Address(regT1, JSStack::ArgumentCount * static_cast<int>(sizeof(Register)) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload)));
9dae56ea	101
6fe7ccc8 A	102	// Initialize 'this'.
6fe7ccc8 A	103	emitGetVirtualRegister(thisValue, regT2);
93a37866	104	store64(regT2, Address(regT1, CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register))));
9dae56ea	105
6fe7ccc8	106	// Copy arguments.
6fe7ccc8	107	signExtend32ToPtr(regT0, regT0);
81345200 A	108	end.append(branchSub64(Zero, TrustedImm32(1), regT0));
81345200 A	109	// regT0: argumentCount
9dae56ea	110
6fe7ccc8	111	Label copyLoop = label();
81345200	112	load64(BaseIndex(callFrameRegister, regT0, TimesEight, (CallFrame::thisArgumentOffset() + firstVarArgOffset) * static_cast<int>(sizeof(Register))), regT2);
93a37866	113	store64(regT2, BaseIndex(regT1, regT0, TimesEight, CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register))));
81345200	114	branchSub64(NonZero, TrustedImm32(1), regT0).linkTo(copyLoop, this);
9dae56ea	115
6fe7ccc8 A	116	end.append(jump());
6fe7ccc8 A	117	}
9dae56ea	118
93a37866	119	if (canOptimize)
6fe7ccc8	120	slowCase.link(this);
9dae56ea	121
81345200 A	122	emitGetVirtualRegister(arguments, regT1);
	123	callOperation(operationSizeFrameForVarargs, regT1, firstFreeRegister, firstVarArgOffset);
	124	move(returnValueGPR, stackPointerRegister);
	125	emitGetVirtualRegister(thisValue, regT1);
	126	emitGetVirtualRegister(arguments, regT2);
	127	callOperation(operationLoadVarargs, returnValueGPR, regT1, regT2, firstVarArgOffset);
	128	move(returnValueGPR, regT1);
6fe7ccc8	129
93a37866	130	if (canOptimize)
6fe7ccc8	131	end.link(this);
81345200 A	132
81345200 A	133	addPtr(TrustedImm32(sizeof(CallerFrameAndPC)), regT1, stackPointerRegister);
9dae56ea A	134	}
9dae56ea A	135
81345200	136	void JIT::compileCallEval(Instruction* instruction)
9dae56ea	137	{
81345200 A	138	addPtr(TrustedImm32(-static_cast<ptrdiff_t>(sizeof(CallerFrameAndPC))), stackPointerRegister, regT1);
	139	callOperationNoExceptionCheck(operationCallEval, regT1);
	140
	141	Jump noException = emitExceptionCheck(InvertedExceptionCheck);
	142	addPtr(TrustedImm32(stackPointerOffsetFor(m_codeBlock) * sizeof(Register)), callFrameRegister, stackPointerRegister);
	143	exceptionCheck(jump());
	144
	145	noException.link(this);
93a37866	146	addSlowCase(branch64(Equal, regT0, TrustedImm64(JSValue::encode(JSValue()))));
81345200 A	147
	148	addPtr(TrustedImm32(stackPointerOffsetFor(m_codeBlock) * sizeof(Register)), callFrameRegister, stackPointerRegister);
	149	checkStackPointerAlignment();
9dae56ea A	150
9dae56ea A	151	sampleCodeBlock(m_codeBlock);
81345200 A	152
81345200 A	153	emitPutCallResult(instruction);
9dae56ea A	154	}
9dae56ea A	155
81345200	156	void JIT::compileCallEvalSlowCase(Instruction* instruction, Vector<SlowCaseEntry>::iterator& iter)
6fe7ccc8 A	157	{
	158	linkSlowCase(iter);
	159
81345200 A	160	load64(Address(stackPointerRegister, sizeof(Register) * JSStack::Callee - sizeof(CallerFrameAndPC)), regT0);
	161	move(TrustedImmPtr(&CallLinkInfo::dummy()), regT2);
	162	emitNakedCall(m_vm->getCTIStub(virtualCallThunkGenerator).code());
	163	addPtr(TrustedImm32(stackPointerOffsetFor(m_codeBlock) * sizeof(Register)), callFrameRegister, stackPointerRegister);
	164	checkStackPointerAlignment();
9dae56ea	165
6fe7ccc8	166	sampleCodeBlock(m_codeBlock);
81345200 A	167
81345200 A	168	emitPutCallResult(instruction);
6fe7ccc8	169	}
9dae56ea A	170
	171	void JIT::compileOpCall(OpcodeID opcodeID, Instruction* instruction, unsigned callLinkInfoIndex)
	172	{
81345200	173	int callee = instruction[2].u.operand;
9dae56ea	174
6fe7ccc8 A	175	/* Caller always:
	176	- Updates callFrameRegister to callee callFrame.
	177	- Initializes ArgumentCount; CallerFrame; Callee.
	178
	179	For a JS call:
	180	- Caller initializes ScopeChain.
	181	- Callee initializes ReturnPC; CodeBlock.
	182	- Callee restores callFrameRegister before return.
	183
	184	For a non-JS call:
	185	- Caller initializes ScopeChain; ReturnPC; CodeBlock.
	186	- Caller restores callFrameRegister after return.
	187	*/
81345200 A	188	COMPILE_ASSERT(OPCODE_LENGTH(op_call) == OPCODE_LENGTH(op_construct), call_and_construct_opcodes_must_be_same_length);
	189	COMPILE_ASSERT(OPCODE_LENGTH(op_call) == OPCODE_LENGTH(op_call_varargs), call_and_call_varargs_opcodes_must_be_same_length);
	190	COMPILE_ASSERT(OPCODE_LENGTH(op_call) == OPCODE_LENGTH(op_construct_varargs), call_and_construct_varargs_opcodes_must_be_same_length);
	191	if (opcodeID == op_call_varargs \|\| opcodeID == op_construct_varargs)
6fe7ccc8 A	192	compileLoadVarargs(instruction);
6fe7ccc8 A	193	else {
81345200 A	194	int argCount = instruction[3].u.operand;
81345200 A	195	int registerOffset = -instruction[4].u.operand;
6fe7ccc8	196
93a37866 A	197	if (opcodeID == op_call && shouldEmitProfiling()) {
	198	emitGetVirtualRegister(registerOffset + CallFrame::argumentOffsetIncludingThis(0), regT0);
	199	Jump done = emitJumpIfNotJSCell(regT0);
81345200 A	200	load32(Address(regT0, JSCell::structureIDOffset()), regT0);
81345200 A	201	store32(regT0, instruction[OPCODE_LENGTH(op_call) - 2].u.arrayProfile->addressOfLastSeenStructureID());
93a37866 A	202	done.link(this);
	203	}
	204
81345200 A	205	addPtr(TrustedImm32(registerOffset * sizeof(Register) + sizeof(CallerFrameAndPC)), callFrameRegister, stackPointerRegister);
	206	store32(TrustedImm32(argCount), Address(stackPointerRegister, JSStack::ArgumentCount * static_cast<int>(sizeof(Register)) + PayloadOffset - sizeof(CallerFrameAndPC)));
	207	} // SP holds newCallFrame + sizeof(CallerFrameAndPC), with ArgumentCount initialized.
6fe7ccc8	208
81345200 A	209	uint32_t bytecodeOffset = instruction - m_codeBlock->instructions().begin();
	210	uint32_t locationBits = CallFrame::Location::encodeAsBytecodeOffset(bytecodeOffset);
	211	store32(TrustedImm32(locationBits), Address(callFrameRegister, JSStack::ArgumentCount * static_cast<int>(sizeof(Register)) + TagOffset));
6fe7ccc8 A	212	emitGetVirtualRegister(callee, regT0); // regT0 holds callee.
6fe7ccc8 A	213
81345200	214	store64(regT0, Address(stackPointerRegister, JSStack::Callee * static_cast<int>(sizeof(Register)) - sizeof(CallerFrameAndPC)));
6fe7ccc8	215
9dae56ea	216	if (opcodeID == op_call_eval) {
81345200	217	compileCallEval(instruction);
6fe7ccc8	218	return;
9dae56ea A	219	}
9dae56ea A	220
9dae56ea	221	DataLabelPtr addressOfLinkedFunctionCheck;
93a37866	222	Jump slowCase = branchPtrWithPatch(NotEqual, regT0, addressOfLinkedFunctionCheck, TrustedImmPtr(0));
6fe7ccc8	223	addSlowCase(slowCase);
f9bf01c6	224
81345200 A	225	ASSERT(m_callCompilationInfo.size() == callLinkInfoIndex);
	226	CallLinkInfo* info = m_codeBlock->addCallLinkInfo();
	227	info->callType = CallLinkInfo::callTypeFor(opcodeID);
	228	info->codeOrigin = CodeOrigin(m_bytecodeOffset);
	229	info->calleeGPR = regT0;
	230	m_callCompilationInfo.append(CallCompilationInfo());
	231	m_callCompilationInfo[callLinkInfoIndex].hotPathBegin = addressOfLinkedFunctionCheck;
	232	m_callCompilationInfo[callLinkInfoIndex].callLinkInfo = info;
9dae56ea	233
81345200 A	234	loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_scope)), regT2);
	235	store64(regT2, Address(MacroAssembler::stackPointerRegister, JSStack::ScopeChain * sizeof(Register) - sizeof(CallerFrameAndPC)));
	236
	237	m_callCompilationInfo[callLinkInfoIndex].hotPathOther = emitNakedCall();
	238
	239	addPtr(TrustedImm32(stackPointerOffsetFor(m_codeBlock) * sizeof(Register)), callFrameRegister, stackPointerRegister);
	240	checkStackPointerAlignment();
9dae56ea	241
9dae56ea	242	sampleCodeBlock(m_codeBlock);
81345200 A	243
81345200 A	244	emitPutCallResult(instruction);
9dae56ea A	245	}
9dae56ea A	246
81345200	247	void JIT::compileOpCallSlowCase(OpcodeID opcodeID, Instruction* instruction, Vector<SlowCaseEntry>::iterator& iter, unsigned callLinkInfoIndex)
9dae56ea	248	{
6fe7ccc8	249	if (opcodeID == op_call_eval) {
81345200	250	compileCallEvalSlowCase(instruction, iter);
6fe7ccc8 A	251	return;
6fe7ccc8 A	252	}
9dae56ea A	253
9dae56ea A	254	linkSlowCase(iter);
81345200 A	255
	256	ThunkGenerator generator = linkThunkGeneratorFor(
	257	(opcodeID == op_construct \|\| opcodeID == op_construct_varargs) ? CodeForConstruct : CodeForCall,
	258	RegisterPreservationNotRequired);
6fe7ccc8	259
81345200 A	260	move(TrustedImmPtr(m_callCompilationInfo[callLinkInfoIndex].callLinkInfo), regT2);
	261	m_callCompilationInfo[callLinkInfoIndex].callReturnLocation = emitNakedCall(m_vm->getCTIStub(generator).code());
	262
	263	addPtr(TrustedImm32(stackPointerOffsetFor(m_codeBlock) * sizeof(Register)), callFrameRegister, stackPointerRegister);
	264	checkStackPointerAlignment();
9dae56ea	265
9dae56ea	266	sampleCodeBlock(m_codeBlock);
81345200 A	267
81345200 A	268	emitPutCallResult(instruction);
9dae56ea A	269	}
9dae56ea A	270
93a37866 A	271	void JIT::privateCompileClosureCall(CallLinkInfo* callLinkInfo, CodeBlock* calleeCodeBlock, Structure* expectedStructure, ExecutableBase* expectedExecutable, MacroAssemblerCodePtr codePtr)
	272	{
	273	JumpList slowCases;
81345200	274
93a37866	275	slowCases.append(branchTestPtr(NonZero, regT0, tagMaskRegister));
81345200	276	slowCases.append(branchStructure(NotEqual, Address(regT0, JSCell::structureIDOffset()), expectedStructure));
93a37866 A	277	slowCases.append(branchPtr(NotEqual, Address(regT0, JSFunction::offsetOfExecutable()), TrustedImmPtr(expectedExecutable)));
	278
	279	loadPtr(Address(regT0, JSFunction::offsetOfScopeChain()), regT1);
	280	emitPutToCallFrameHeader(regT1, JSStack::ScopeChain);
	281
	282	Call call = nearCall();
	283	Jump done = jump();
	284
	285	slowCases.link(this);
	286	move(TrustedImmPtr(callLinkInfo->callReturnLocation.executableAddress()), regT2);
	287	restoreReturnAddressBeforeReturn(regT2);
	288	Jump slow = jump();
	289
81345200	290	LinkBuffer patchBuffer(m_vm, this, m_codeBlock);
93a37866 A	291
	292	patchBuffer.link(call, FunctionPtr(codePtr.executableAddress()));
	293	patchBuffer.link(done, callLinkInfo->hotPathOther.labelAtOffset(0));
81345200	294	patchBuffer.link(slow, CodeLocationLabel(m_vm->getCTIStub(virtualCallThunkGenerator).code()));
93a37866 A	295
	296	RefPtr<ClosureCallStubRoutine> stubRoutine = adoptRef(new ClosureCallStubRoutine(
	297	FINALIZE_CODE(
	298	patchBuffer,
	299	("Baseline closure call stub for %s, return point %p, target %p (%s)",
	300	toCString(*m_codeBlock).data(),
	301	callLinkInfo->hotPathOther.labelAtOffset(0).executableAddress(),
	302	codePtr.executableAddress(),
	303	toCString(pointerDump(calleeCodeBlock)).data())),
	304	*m_vm, m_codeBlock->ownerExecutable(), expectedStructure, expectedExecutable,
	305	callLinkInfo->codeOrigin));
	306
	307	RepatchBuffer repatchBuffer(m_codeBlock);
	308
	309	repatchBuffer.replaceWithJump(
	310	RepatchBuffer::startOfBranchPtrWithPatchOnRegister(callLinkInfo->hotPathBegin),
	311	CodeLocationLabel(stubRoutine->code().code()));
81345200 A	312	repatchBuffer.relink(callLinkInfo->callReturnLocation, m_vm->getCTIStub(virtualCallThunkGenerator).code());
81345200 A	313
93a37866 A	314	callLinkInfo->stub = stubRoutine.release();
	315	}
	316
81345200 A	317	void JIT::emit_op_call(Instruction* currentInstruction)
	318	{
	319	compileOpCall(op_call, currentInstruction, m_callLinkInfoIndex++);
	320	}
	321
	322	void JIT::emit_op_call_eval(Instruction* currentInstruction)
	323	{
	324	compileOpCall(op_call_eval, currentInstruction, m_callLinkInfoIndex);
	325	}
	326
	327	void JIT::emit_op_call_varargs(Instruction* currentInstruction)
	328	{
	329	compileOpCall(op_call_varargs, currentInstruction, m_callLinkInfoIndex++);
	330	}
	331
	332	void JIT::emit_op_construct_varargs(Instruction* currentInstruction)
	333	{
	334	compileOpCall(op_construct_varargs, currentInstruction, m_callLinkInfoIndex++);
	335	}
	336
	337	void JIT::emit_op_construct(Instruction* currentInstruction)
	338	{
	339	compileOpCall(op_construct, currentInstruction, m_callLinkInfoIndex++);
	340	}
	341
	342	void JIT::emitSlow_op_call(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
	343	{
	344	compileOpCallSlowCase(op_call, currentInstruction, iter, m_callLinkInfoIndex++);
	345	}
	346
	347	void JIT::emitSlow_op_call_eval(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
	348	{
	349	compileOpCallSlowCase(op_call_eval, currentInstruction, iter, m_callLinkInfoIndex);
	350	}
	351
	352	void JIT::emitSlow_op_call_varargs(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
	353	{
	354	compileOpCallSlowCase(op_call_varargs, currentInstruction, iter, m_callLinkInfoIndex++);
	355	}
	356
	357	void JIT::emitSlow_op_construct_varargs(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
	358	{
	359	compileOpCallSlowCase(op_construct_varargs, currentInstruction, iter, m_callLinkInfoIndex++);
	360	}
	361
	362	void JIT::emitSlow_op_construct(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
	363	{
	364	compileOpCallSlowCase(op_construct, currentInstruction, iter, m_callLinkInfoIndex++);
	365	}
	366
9dae56ea A	367	} // namespace JSC
9dae56ea A	368
14957cd0	369	#endif // USE(JSVALUE64)
9dae56ea	370	#endif // ENABLE(JIT)