[apple/javascriptcore.git] / jit / JITCall32_64.cpp

/*
 * 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(JSVALUE32_64)
#include "JIT.h"

#include "Arguments.h"
#include "CodeBlock.h"
#include "Interpreter.h"
#include "JITInlines.h"
#include "JITStubCall.h"
#include "JSArray.h"
#include "JSFunction.h"
#include "Operations.h"
#include "RepatchBuffer.h"
#include "ResultType.h"
#include "SamplingTool.h"
#include <wtf/StringPrintStream.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();
    emitStore(dst, regT1, regT0);
}

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

    emitLoad(dst, regT1, regT0);
    emitGetFromCallFrameHeaderPtr(JSStack::ReturnPC, regT2);
    emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, callFrameRegister);

    restoreReturnAddressBeforeReturn(regT2);
    ret();
}

void JIT::emit_op_ret_object_or_this(Instruction* currentInstruction)
{
    unsigned result = currentInstruction[1].u.operand;
    unsigned thisReg = currentInstruction[2].u.operand;

    emitLoad(result, regT1, regT0);
    Jump notJSCell = branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag));
    loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
    Jump notObject = emitJumpIfNotObject(regT2);

    emitGetFromCallFrameHeaderPtr(JSStack::ReturnPC, regT2);
    emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, callFrameRegister);

    restoreReturnAddressBeforeReturn(regT2);
    ret();

    notJSCell.link(this);
    notObject.link(this);
    emitLoad(thisReg, regT1, regT0);

    emitGetFromCallFrameHeaderPtr(JSStack::ReturnPC, regT2);
    emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, callFrameRegister);

    restoreReturnAddressBeforeReturn(regT2);
    ret();
}

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++);
}

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

    JumpList slowCase;
    JumpList end;
    bool canOptimize = m_codeBlock->usesArguments()
        && arguments == m_codeBlock->argumentsRegister()
        && !m_codeBlock->symbolTable()->slowArguments();

    if (canOptimize) {
        emitLoadTag(arguments, regT1);
        slowCase.append(branch32(NotEqual, regT1, TrustedImm32(JSValue::EmptyValueTag)));

        load32(payloadFor(JSStack::ArgumentCount), regT2);
        slowCase.append(branch32(Above, regT2, TrustedImm32(Arguments::MaxArguments + 1)));
        // regT2: argumentCountIncludingThis

        move(regT2, regT3);
        add32(TrustedImm32(firstFreeRegister + JSStack::CallFrameHeaderSize), regT3);
        lshift32(TrustedImm32(3), regT3);
        addPtr(callFrameRegister, regT3);
        // regT3: newCallFrame

        slowCase.append(branchPtr(Below, AbsoluteAddress(m_vm->interpreter->stack().addressOfEnd()), regT3));

        // Initialize ArgumentCount.
        store32(regT2, payloadFor(JSStack::ArgumentCount, regT3));

        // Initialize 'this'.
        emitLoad(thisValue, regT1, regT0);
        store32(regT0, Address(regT3, OBJECT_OFFSETOF(JSValue, u.asBits.payload) + (CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
        store32(regT1, Address(regT3, OBJECT_OFFSETOF(JSValue, u.asBits.tag) + (CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));

        // Copy arguments.
        neg32(regT2);
        end.append(branchAdd32(Zero, TrustedImm32(1), regT2));
        // regT2: -argumentCount;

        Label copyLoop = label();
        load32(BaseIndex(callFrameRegister, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.payload) +(CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))), regT0);
        load32(BaseIndex(callFrameRegister, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.tag) +(CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))), regT1);
        store32(regT0, BaseIndex(regT3, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.payload) +(CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
        store32(regT1, BaseIndex(regT3, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.tag) +(CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
        branchAdd32(NonZero, TrustedImm32(1), regT2).linkTo(copyLoop, this);

        end.append(jump());
    }

    if (canOptimize)
        slowCase.link(this);

    JITStubCall stubCall(this, cti_op_load_varargs);
    stubCall.addArgument(thisValue);
    stubCall.addArgument(arguments);
    stubCall.addArgument(Imm32(firstFreeRegister));
    stubCall.call(regT3);

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

void JIT::compileCallEval()
{
    JITStubCall stubCall(this, cti_op_call_eval); // Initializes ScopeChain; ReturnPC; CodeBlock.
    stubCall.call();
    addSlowCase(branch32(Equal, regT1, TrustedImm32(JSValue::EmptyValueTag)));
    emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, callFrameRegister);

    sampleCodeBlock(m_codeBlock);
}

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

    emitLoad(JSStack::Callee, regT1, regT0);
    emitNakedCall(m_vm->getCTIStub(virtualCallGenerator).code());

    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 && shouldEmitProfiling()) {
            emitLoad(registerOffset + CallFrame::argumentOffsetIncludingThis(0), regT0, regT1);
            Jump done = branch32(NotEqual, regT0, TrustedImm32(JSValue::CellTag));
            loadPtr(Address(regT1, JSCell::structureOffset()), regT1);
            storePtr(regT1, instruction[5].u.arrayProfile->addressOfLastSeenStructure());
            done.link(this);
        }
    
        addPtr(TrustedImm32(registerOffset * sizeof(Register)), callFrameRegister, regT3);

        store32(TrustedImm32(argCount), payloadFor(JSStack::ArgumentCount, regT3));
    } // regT3 holds newCallFrame with ArgumentCount initialized.
    
    storePtr(TrustedImmPtr(instruction), tagFor(JSStack::ArgumentCount, callFrameRegister));
    emitLoad(callee, regT1, regT0); // regT1, regT0 holds callee.

    storePtr(callFrameRegister, Address(regT3, JSStack::CallerFrame * static_cast<int>(sizeof(Register))));
    emitStore(JSStack::Callee, regT1, regT0, regT3);
    move(regT3, 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);
    addSlowCase(branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag)));

    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);
    emitPutCellToCallFrameHeader(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);
    linkSlowCase(iter);
    
    m_callStructureStubCompilationInfo[callLinkInfoIndex].callReturnLocation = emitNakedCall(opcodeID == op_construct ? m_vm->getCTIStub(linkConstructGenerator).code() : m_vm->getCTIStub(linkCallGenerator).code());

    sampleCodeBlock(m_codeBlock);
}

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

    slowCases.append(branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag)));
    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);
    emitPutCellToCallFrameHeader(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(virtualCallGenerator).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(virtualCallGenerator).code());
    
    callLinkInfo->stub = stubRoutine.release();
}

} // namespace JSC

#endif // USE(JSVALUE32_64)
#endif // ENABLE(JIT)
Commit	Line	Data
14957cd0	1	/*
93a37866	2	* Copyright (C) 2008, 2013 Apple Inc. All rights reserved.
14957cd0 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"
	27
	28	#if ENABLE(JIT)
	29	#if USE(JSVALUE32_64)
	30	#include "JIT.h"
	31
6fe7ccc8	32	#include "Arguments.h"
14957cd0 A	33	#include "CodeBlock.h"
14957cd0 A	34	#include "Interpreter.h"
93a37866	35	#include "JITInlines.h"
14957cd0 A	36	#include "JITStubCall.h"
	37	#include "JSArray.h"
	38	#include "JSFunction.h"
93a37866 A	39	#include "Operations.h"
93a37866 A	40	#include "RepatchBuffer.h"
14957cd0 A	41	#include "ResultType.h"
14957cd0 A	42	#include "SamplingTool.h"
93a37866	43	#include <wtf/StringPrintStream.h>
14957cd0 A	44
	45	#ifndef NDEBUG
	46	#include <stdio.h>
	47	#endif
	48
	49	using namespace std;
	50
	51	namespace JSC {
	52
14957cd0 A	53	void JIT::emit_op_call_put_result(Instruction* instruction)
	54	{
	55	int dst = instruction[1].u.operand;
6fe7ccc8	56	emitValueProfilingSite();
14957cd0 A	57	emitStore(dst, regT1, regT0);
	58	}
	59
14957cd0 A	60	void JIT::emit_op_ret(Instruction* currentInstruction)
	61	{
	62	unsigned dst = currentInstruction[1].u.operand;
	63
	64	emitLoad(dst, regT1, regT0);
93a37866 A	65	emitGetFromCallFrameHeaderPtr(JSStack::ReturnPC, regT2);
93a37866 A	66	emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, callFrameRegister);
14957cd0 A	67
	68	restoreReturnAddressBeforeReturn(regT2);
	69	ret();
	70	}
	71
	72	void JIT::emit_op_ret_object_or_this(Instruction* currentInstruction)
	73	{
	74	unsigned result = currentInstruction[1].u.operand;
	75	unsigned thisReg = currentInstruction[2].u.operand;
	76
	77	emitLoad(result, regT1, regT0);
	78	Jump notJSCell = branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag));
	79	loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
6fe7ccc8	80	Jump notObject = emitJumpIfNotObject(regT2);
14957cd0	81
93a37866 A	82	emitGetFromCallFrameHeaderPtr(JSStack::ReturnPC, regT2);
93a37866 A	83	emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, callFrameRegister);
14957cd0 A	84
	85	restoreReturnAddressBeforeReturn(regT2);
	86	ret();
	87
	88	notJSCell.link(this);
	89	notObject.link(this);
	90	emitLoad(thisReg, regT1, regT0);
	91
93a37866 A	92	emitGetFromCallFrameHeaderPtr(JSStack::ReturnPC, regT2);
93a37866 A	93	emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, callFrameRegister);
14957cd0 A	94
	95	restoreReturnAddressBeforeReturn(regT2);
	96	ret();
	97	}
	98
	99	void JIT::emitSlow_op_call(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
	100	{
6fe7ccc8	101	compileOpCallSlowCase(op_call, currentInstruction, iter, m_callLinkInfoIndex++);
14957cd0 A	102	}
	103
	104	void JIT::emitSlow_op_call_eval(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
	105	{
6fe7ccc8	106	compileOpCallSlowCase(op_call_eval, currentInstruction, iter, m_callLinkInfoIndex);
14957cd0	107	}
6fe7ccc8	108
14957cd0 A	109	void JIT::emitSlow_op_call_varargs(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
14957cd0 A	110	{
6fe7ccc8	111	compileOpCallSlowCase(op_call_varargs, currentInstruction, iter, m_callLinkInfoIndex++);
14957cd0 A	112	}
	113
	114	void JIT::emitSlow_op_construct(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
	115	{
6fe7ccc8	116	compileOpCallSlowCase(op_construct, currentInstruction, iter, m_callLinkInfoIndex++);
14957cd0 A	117	}
	118
	119	void JIT::emit_op_call(Instruction* currentInstruction)
	120	{
	121	compileOpCall(op_call, currentInstruction, m_callLinkInfoIndex++);
	122	}
	123
	124	void JIT::emit_op_call_eval(Instruction* currentInstruction)
	125	{
6fe7ccc8	126	compileOpCall(op_call_eval, currentInstruction, m_callLinkInfoIndex);
14957cd0 A	127	}
	128
	129	void JIT::emit_op_call_varargs(Instruction* currentInstruction)
	130	{
6fe7ccc8	131	compileOpCall(op_call_varargs, currentInstruction, m_callLinkInfoIndex++);
14957cd0 A	132	}
	133
	134	void JIT::emit_op_construct(Instruction* currentInstruction)
	135	{
	136	compileOpCall(op_construct, currentInstruction, m_callLinkInfoIndex++);
	137	}
	138
6fe7ccc8	139	void JIT::compileLoadVarargs(Instruction* instruction)
14957cd0	140	{
6fe7ccc8 A	141	int thisValue = instruction[2].u.operand;
	142	int arguments = instruction[3].u.operand;
	143	int firstFreeRegister = instruction[4].u.operand;
	144
	145	JumpList slowCase;
	146	JumpList end;
93a37866 A	147	bool canOptimize = m_codeBlock->usesArguments()
	148	&& arguments == m_codeBlock->argumentsRegister()
	149	&& !m_codeBlock->symbolTable()->slowArguments();
	150
	151	if (canOptimize) {
6fe7ccc8 A	152	emitLoadTag(arguments, regT1);
	153	slowCase.append(branch32(NotEqual, regT1, TrustedImm32(JSValue::EmptyValueTag)));
	154
93a37866	155	load32(payloadFor(JSStack::ArgumentCount), regT2);
6fe7ccc8 A	156	slowCase.append(branch32(Above, regT2, TrustedImm32(Arguments::MaxArguments + 1)));
	157	// regT2: argumentCountIncludingThis
	158
	159	move(regT2, regT3);
93a37866	160	add32(TrustedImm32(firstFreeRegister + JSStack::CallFrameHeaderSize), regT3);
6fe7ccc8 A	161	lshift32(TrustedImm32(3), regT3);
	162	addPtr(callFrameRegister, regT3);
	163	// regT3: newCallFrame
	164
93a37866	165	slowCase.append(branchPtr(Below, AbsoluteAddress(m_vm->interpreter->stack().addressOfEnd()), regT3));
6fe7ccc8 A	166
6fe7ccc8 A	167	// Initialize ArgumentCount.
93a37866	168	store32(regT2, payloadFor(JSStack::ArgumentCount, regT3));
6fe7ccc8 A	169
	170	// Initialize 'this'.
	171	emitLoad(thisValue, regT1, regT0);
	172	store32(regT0, Address(regT3, OBJECT_OFFSETOF(JSValue, u.asBits.payload) + (CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
	173	store32(regT1, Address(regT3, OBJECT_OFFSETOF(JSValue, u.asBits.tag) + (CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
	174
	175	// Copy arguments.
	176	neg32(regT2);
	177	end.append(branchAdd32(Zero, TrustedImm32(1), regT2));
	178	// regT2: -argumentCount;
	179
	180	Label copyLoop = label();
	181	load32(BaseIndex(callFrameRegister, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.payload) +(CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))), regT0);
	182	load32(BaseIndex(callFrameRegister, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.tag) +(CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))), regT1);
	183	store32(regT0, BaseIndex(regT3, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.payload) +(CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
	184	store32(regT1, BaseIndex(regT3, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.tag) +(CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
	185	branchAdd32(NonZero, TrustedImm32(1), regT2).linkTo(copyLoop, this);
	186
	187	end.append(jump());
14957cd0 A	188	}
14957cd0 A	189
93a37866	190	if (canOptimize)
6fe7ccc8	191	slowCase.link(this);
14957cd0	192
6fe7ccc8 A	193	JITStubCall stubCall(this, cti_op_load_varargs);
	194	stubCall.addArgument(thisValue);
	195	stubCall.addArgument(arguments);
	196	stubCall.addArgument(Imm32(firstFreeRegister));
	197	stubCall.call(regT3);
14957cd0	198
93a37866	199	if (canOptimize)
6fe7ccc8 A	200	end.link(this);
6fe7ccc8 A	201	}
14957cd0	202
6fe7ccc8 A	203	void JIT::compileCallEval()
	204	{
	205	JITStubCall stubCall(this, cti_op_call_eval); // Initializes ScopeChain; ReturnPC; CodeBlock.
	206	stubCall.call();
	207	addSlowCase(branch32(Equal, regT1, TrustedImm32(JSValue::EmptyValueTag)));
93a37866	208	emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, callFrameRegister);
14957cd0 A	209
	210	sampleCodeBlock(m_codeBlock);
	211	}
	212
6fe7ccc8	213	void JIT::compileCallEvalSlowCase(Vector<SlowCaseEntry>::iterator& iter)
14957cd0	214	{
14957cd0 A	215	linkSlowCase(iter);
14957cd0 A	216
93a37866 A	217	emitLoad(JSStack::Callee, regT1, regT0);
93a37866 A	218	emitNakedCall(m_vm->getCTIStub(virtualCallGenerator).code());
14957cd0 A	219
	220	sampleCodeBlock(m_codeBlock);
	221	}
	222
14957cd0 A	223	void JIT::compileOpCall(OpcodeID opcodeID, Instruction* instruction, unsigned callLinkInfoIndex)
	224	{
	225	int callee = instruction[1].u.operand;
14957cd0	226
6fe7ccc8 A	227	/* Caller always:
	228	- Updates callFrameRegister to callee callFrame.
	229	- Initializes ArgumentCount; CallerFrame; Callee.
14957cd0	230
6fe7ccc8 A	231	For a JS call:
	232	- Caller initializes ScopeChain.
	233	- Callee initializes ReturnPC; CodeBlock.
	234	- Callee restores callFrameRegister before return.
14957cd0	235
6fe7ccc8 A	236	For a non-JS call:
	237	- Caller initializes ScopeChain; ReturnPC; CodeBlock.
	238	- Caller restores callFrameRegister after return.
	239	*/
	240
	241	if (opcodeID == op_call_varargs)
	242	compileLoadVarargs(instruction);
	243	else {
	244	int argCount = instruction[2].u.operand;
	245	int registerOffset = instruction[3].u.operand;
93a37866 A	246
	247	if (opcodeID == op_call && shouldEmitProfiling()) {
	248	emitLoad(registerOffset + CallFrame::argumentOffsetIncludingThis(0), regT0, regT1);
	249	Jump done = branch32(NotEqual, regT0, TrustedImm32(JSValue::CellTag));
	250	loadPtr(Address(regT1, JSCell::structureOffset()), regT1);
	251	storePtr(regT1, instruction[5].u.arrayProfile->addressOfLastSeenStructure());
	252	done.link(this);
	253	}
	254
6fe7ccc8	255	addPtr(TrustedImm32(registerOffset * sizeof(Register)), callFrameRegister, regT3);
14957cd0	256
93a37866	257	store32(TrustedImm32(argCount), payloadFor(JSStack::ArgumentCount, regT3));
6fe7ccc8 A	258	} // regT3 holds newCallFrame with ArgumentCount initialized.
6fe7ccc8 A	259
93a37866	260	storePtr(TrustedImmPtr(instruction), tagFor(JSStack::ArgumentCount, callFrameRegister));
6fe7ccc8	261	emitLoad(callee, regT1, regT0); // regT1, regT0 holds callee.
14957cd0	262
93a37866 A	263	storePtr(callFrameRegister, Address(regT3, JSStack::CallerFrame * static_cast<int>(sizeof(Register))));
93a37866 A	264	emitStore(JSStack::Callee, regT1, regT0, regT3);
6fe7ccc8	265	move(regT3, callFrameRegister);
14957cd0	266
6fe7ccc8 A	267	if (opcodeID == op_call_eval) {
	268	compileCallEval();
	269	return;
	270	}
14957cd0	271
6fe7ccc8 A	272	DataLabelPtr addressOfLinkedFunctionCheck;
	273	BEGIN_UNINTERRUPTED_SEQUENCE(sequenceOpCall);
	274	Jump slowCase = branchPtrWithPatch(NotEqual, regT0, addressOfLinkedFunctionCheck, TrustedImmPtr(0));
	275	END_UNINTERRUPTED_SEQUENCE(sequenceOpCall);
14957cd0	276
6fe7ccc8 A	277	addSlowCase(slowCase);
6fe7ccc8 A	278	addSlowCase(branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag)));
14957cd0	279
6fe7ccc8 A	280	ASSERT(m_callStructureStubCompilationInfo.size() == callLinkInfoIndex);
	281	m_callStructureStubCompilationInfo.append(StructureStubCompilationInfo());
	282	m_callStructureStubCompilationInfo[callLinkInfoIndex].hotPathBegin = addressOfLinkedFunctionCheck;
	283	m_callStructureStubCompilationInfo[callLinkInfoIndex].callType = CallLinkInfo::callTypeFor(opcodeID);
	284	m_callStructureStubCompilationInfo[callLinkInfoIndex].bytecodeIndex = m_bytecodeOffset;
14957cd0	285
93a37866 A	286	loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_scope)), regT1);
93a37866 A	287	emitPutCellToCallFrameHeader(regT1, JSStack::ScopeChain);
14957cd0	288	m_callStructureStubCompilationInfo[callLinkInfoIndex].hotPathOther = emitNakedCall();
14957cd0 A	289
	290	sampleCodeBlock(m_codeBlock);
	291	}
	292
6fe7ccc8	293	void JIT::compileOpCallSlowCase(OpcodeID opcodeID, Instruction*, Vector<SlowCaseEntry>::iterator& iter, unsigned callLinkInfoIndex)
14957cd0	294	{
6fe7ccc8 A	295	if (opcodeID == op_call_eval) {
	296	compileCallEvalSlowCase(iter);
	297	return;
	298	}
14957cd0 A	299
	300	linkSlowCase(iter);
	301	linkSlowCase(iter);
6fe7ccc8	302
93a37866	303	m_callStructureStubCompilationInfo[callLinkInfoIndex].callReturnLocation = emitNakedCall(opcodeID == op_construct ? m_vm->getCTIStub(linkConstructGenerator).code() : m_vm->getCTIStub(linkCallGenerator).code());
14957cd0	304
14957cd0 A	305	sampleCodeBlock(m_codeBlock);
	306	}
	307
93a37866 A	308	void JIT::privateCompileClosureCall(CallLinkInfo* callLinkInfo, CodeBlock* calleeCodeBlock, Structure* expectedStructure, ExecutableBase* expectedExecutable, MacroAssemblerCodePtr codePtr)
	309	{
	310	JumpList slowCases;
	311
	312	slowCases.append(branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag)));
	313	slowCases.append(branchPtr(NotEqual, Address(regT0, JSCell::structureOffset()), TrustedImmPtr(expectedStructure)));
	314	slowCases.append(branchPtr(NotEqual, Address(regT0, JSFunction::offsetOfExecutable()), TrustedImmPtr(expectedExecutable)));
	315
	316	loadPtr(Address(regT0, JSFunction::offsetOfScopeChain()), regT1);
	317	emitPutCellToCallFrameHeader(regT1, JSStack::ScopeChain);
	318
	319	Call call = nearCall();
	320	Jump done = jump();
	321
	322	slowCases.link(this);
	323	move(TrustedImmPtr(callLinkInfo->callReturnLocation.executableAddress()), regT2);
	324	restoreReturnAddressBeforeReturn(regT2);
	325	Jump slow = jump();
	326
	327	LinkBuffer patchBuffer(*m_vm, this, m_codeBlock);
	328
	329	patchBuffer.link(call, FunctionPtr(codePtr.executableAddress()));
	330	patchBuffer.link(done, callLinkInfo->hotPathOther.labelAtOffset(0));
	331	patchBuffer.link(slow, CodeLocationLabel(m_vm->getCTIStub(virtualCallGenerator).code()));
	332
	333	RefPtr<ClosureCallStubRoutine> stubRoutine = adoptRef(new ClosureCallStubRoutine(
	334	FINALIZE_CODE(
	335	patchBuffer,
	336	("Baseline closure call stub for %s, return point %p, target %p (%s)",
	337	toCString(*m_codeBlock).data(),
	338	callLinkInfo->hotPathOther.labelAtOffset(0).executableAddress(),
	339	codePtr.executableAddress(),
	340	toCString(pointerDump(calleeCodeBlock)).data())),
	341	*m_vm, m_codeBlock->ownerExecutable(), expectedStructure, expectedExecutable,
	342	callLinkInfo->codeOrigin));
	343
	344	RepatchBuffer repatchBuffer(m_codeBlock);
	345
	346	repatchBuffer.replaceWithJump(
	347	RepatchBuffer::startOfBranchPtrWithPatchOnRegister(callLinkInfo->hotPathBegin),
	348	CodeLocationLabel(stubRoutine->code().code()));
	349	repatchBuffer.relink(callLinkInfo->callReturnLocation, m_vm->getCTIStub(virtualCallGenerator).code());
	350
	351	callLinkInfo->stub = stubRoutine.release();
	352	}
	353
14957cd0 A	354	} // namespace JSC
	355
	356	#endif // USE(JSVALUE32_64)
	357	#endif // ENABLE(JIT)