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

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

#include "Arguments.h"
#include "CodeBlock.h"
#include "Interpreter.h"
#include "JITInlineMethods.h"
#include "JITStubCall.h"
#include "JSArray.h"
#include "JSFunction.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();
    emitStore(dst, regT1, regT0);
}

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

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

    restoreReturnAddressBeforeReturn(regT2);
    ret();
}

void JIT::emit_op_ret_object_or_this(Instruction* currentInstruction)
{
    emitOptimizationCheck(RetOptimizationCheck);
    
    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(RegisterFile::ReturnPC, regT2);
    emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, callFrameRegister);

    restoreReturnAddressBeforeReturn(regT2);
    ret();

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

    emitGetFromCallFrameHeaderPtr(RegisterFile::ReturnPC, regT2);
    emitGetFromCallFrameHeaderPtr(RegisterFile::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;
    if (m_codeBlock->usesArguments() && arguments == m_codeBlock->argumentsRegister()) {
        emitLoadTag(arguments, regT1);
        slowCase.append(branch32(NotEqual, regT1, TrustedImm32(JSValue::EmptyValueTag)));

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

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

        slowCase.append(branchPtr(Below, AbsoluteAddress(m_globalData->interpreter->registerFile().addressOfEnd()), regT3));

        // Initialize ArgumentCount.
        store32(regT2, payloadFor(RegisterFile::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 (m_codeBlock->usesArguments() && arguments == m_codeBlock->argumentsRegister())
        slowCase.link(this);

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

    if (m_codeBlock->usesArguments() && arguments == m_codeBlock->argumentsRegister())
        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(RegisterFile::CallerFrame, callFrameRegister);

    sampleCodeBlock(m_codeBlock);
}

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

    emitLoad(RegisterFile::Callee, regT1, 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;

        addPtr(TrustedImm32(registerOffset * sizeof(Register)), callFrameRegister, regT3);

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

    storePtr(callFrameRegister, Address(regT3, RegisterFile::CallerFrame * static_cast<int>(sizeof(Register))));
    emitStore(RegisterFile::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_scopeChain)), regT1);
    emitPutCellToCallFrameHeader(regT1, RegisterFile::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_globalData->jitStubs->ctiVirtualConstructLink() : m_globalData->jitStubs->ctiVirtualCallLink());

    sampleCodeBlock(m_codeBlock);
}

} // namespace JSC

#endif // USE(JSVALUE32_64)
#endif // ENABLE(JIT)
Commit	Line	Data
14957cd0 A	1	/*
	2	* Copyright (C) 2008 Apple Inc. All rights reserved.
	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"
	34	#include "Interpreter.h"
	35	#include "JITInlineMethods.h"
	36	#include "JITStubCall.h"
	37	#include "JSArray.h"
	38	#include "JSFunction.h"
	39	#include "ResultType.h"
	40	#include "SamplingTool.h"
	41
	42	#ifndef NDEBUG
	43	#include <stdio.h>
	44	#endif
	45
	46	using namespace std;
	47
	48	namespace JSC {
	49
14957cd0 A	50	void JIT::emit_op_call_put_result(Instruction* instruction)
	51	{
	52	int dst = instruction[1].u.operand;
6fe7ccc8	53	emitValueProfilingSite();
14957cd0 A	54	emitStore(dst, regT1, regT0);
	55	}
	56
14957cd0 A	57	void JIT::emit_op_ret(Instruction* currentInstruction)
14957cd0 A	58	{
6fe7ccc8 A	59	emitOptimizationCheck(RetOptimizationCheck);
6fe7ccc8 A	60
14957cd0 A	61	unsigned dst = currentInstruction[1].u.operand;
	62
	63	emitLoad(dst, regT1, regT0);
	64	emitGetFromCallFrameHeaderPtr(RegisterFile::ReturnPC, regT2);
	65	emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, callFrameRegister);
	66
	67	restoreReturnAddressBeforeReturn(regT2);
	68	ret();
	69	}
	70
	71	void JIT::emit_op_ret_object_or_this(Instruction* currentInstruction)
	72	{
6fe7ccc8 A	73	emitOptimizationCheck(RetOptimizationCheck);
6fe7ccc8 A	74
14957cd0 A	75	unsigned result = currentInstruction[1].u.operand;
	76	unsigned thisReg = currentInstruction[2].u.operand;
	77
	78	emitLoad(result, regT1, regT0);
	79	Jump notJSCell = branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag));
	80	loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
6fe7ccc8	81	Jump notObject = emitJumpIfNotObject(regT2);
14957cd0 A	82
	83	emitGetFromCallFrameHeaderPtr(RegisterFile::ReturnPC, regT2);
	84	emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, callFrameRegister);
	85
	86	restoreReturnAddressBeforeReturn(regT2);
	87	ret();
	88
	89	notJSCell.link(this);
	90	notObject.link(this);
	91	emitLoad(thisReg, regT1, regT0);
	92
	93	emitGetFromCallFrameHeaderPtr(RegisterFile::ReturnPC, regT2);
	94	emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, callFrameRegister);
	95
	96	restoreReturnAddressBeforeReturn(regT2);
	97	ret();
	98	}
	99
	100	void JIT::emitSlow_op_call(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
	101	{
6fe7ccc8	102	compileOpCallSlowCase(op_call, currentInstruction, iter, m_callLinkInfoIndex++);
14957cd0 A	103	}
	104
	105	void JIT::emitSlow_op_call_eval(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
	106	{
6fe7ccc8	107	compileOpCallSlowCase(op_call_eval, currentInstruction, iter, m_callLinkInfoIndex);
14957cd0	108	}
6fe7ccc8	109
14957cd0 A	110	void JIT::emitSlow_op_call_varargs(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
14957cd0 A	111	{
6fe7ccc8	112	compileOpCallSlowCase(op_call_varargs, currentInstruction, iter, m_callLinkInfoIndex++);
14957cd0 A	113	}
	114
	115	void JIT::emitSlow_op_construct(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
	116	{
6fe7ccc8	117	compileOpCallSlowCase(op_construct, currentInstruction, iter, m_callLinkInfoIndex++);
14957cd0 A	118	}
	119
	120	void JIT::emit_op_call(Instruction* currentInstruction)
	121	{
	122	compileOpCall(op_call, currentInstruction, m_callLinkInfoIndex++);
	123	}
	124
	125	void JIT::emit_op_call_eval(Instruction* currentInstruction)
	126	{
6fe7ccc8	127	compileOpCall(op_call_eval, currentInstruction, m_callLinkInfoIndex);
14957cd0 A	128	}
	129
	130	void JIT::emit_op_call_varargs(Instruction* currentInstruction)
	131	{
6fe7ccc8	132	compileOpCall(op_call_varargs, currentInstruction, m_callLinkInfoIndex++);
14957cd0 A	133	}
	134
	135	void JIT::emit_op_construct(Instruction* currentInstruction)
	136	{
	137	compileOpCall(op_construct, currentInstruction, m_callLinkInfoIndex++);
	138	}
	139
6fe7ccc8	140	void JIT::compileLoadVarargs(Instruction* instruction)
14957cd0	141	{
6fe7ccc8 A	142	int thisValue = instruction[2].u.operand;
	143	int arguments = instruction[3].u.operand;
	144	int firstFreeRegister = instruction[4].u.operand;
	145
	146	JumpList slowCase;
	147	JumpList end;
	148	if (m_codeBlock->usesArguments() && arguments == m_codeBlock->argumentsRegister()) {
	149	emitLoadTag(arguments, regT1);
	150	slowCase.append(branch32(NotEqual, regT1, TrustedImm32(JSValue::EmptyValueTag)));
	151
	152	load32(payloadFor(RegisterFile::ArgumentCount), regT2);
	153	slowCase.append(branch32(Above, regT2, TrustedImm32(Arguments::MaxArguments + 1)));
	154	// regT2: argumentCountIncludingThis
	155
	156	move(regT2, regT3);
	157	add32(TrustedImm32(firstFreeRegister + RegisterFile::CallFrameHeaderSize), regT3);
	158	lshift32(TrustedImm32(3), regT3);
	159	addPtr(callFrameRegister, regT3);
	160	// regT3: newCallFrame
	161
	162	slowCase.append(branchPtr(Below, AbsoluteAddress(m_globalData->interpreter->registerFile().addressOfEnd()), regT3));
	163
	164	// Initialize ArgumentCount.
	165	store32(regT2, payloadFor(RegisterFile::ArgumentCount, regT3));
	166
	167	// Initialize 'this'.
	168	emitLoad(thisValue, regT1, regT0);
	169	store32(regT0, Address(regT3, OBJECT_OFFSETOF(JSValue, u.asBits.payload) + (CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
	170	store32(regT1, Address(regT3, OBJECT_OFFSETOF(JSValue, u.asBits.tag) + (CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
	171
	172	// Copy arguments.
	173	neg32(regT2);
	174	end.append(branchAdd32(Zero, TrustedImm32(1), regT2));
	175	// regT2: -argumentCount;
	176
	177	Label copyLoop = label();
	178	load32(BaseIndex(callFrameRegister, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.payload) +(CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))), regT0);
	179	load32(BaseIndex(callFrameRegister, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.tag) +(CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))), regT1);
	180	store32(regT0, BaseIndex(regT3, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.payload) +(CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
	181	store32(regT1, BaseIndex(regT3, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.tag) +(CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
	182	branchAdd32(NonZero, TrustedImm32(1), regT2).linkTo(copyLoop, this);
	183
	184	end.append(jump());
14957cd0 A	185	}
14957cd0 A	186
6fe7ccc8 A	187	if (m_codeBlock->usesArguments() && arguments == m_codeBlock->argumentsRegister())
6fe7ccc8 A	188	slowCase.link(this);
14957cd0	189
6fe7ccc8 A	190	JITStubCall stubCall(this, cti_op_load_varargs);
	191	stubCall.addArgument(thisValue);
	192	stubCall.addArgument(arguments);
	193	stubCall.addArgument(Imm32(firstFreeRegister));
	194	stubCall.call(regT3);
14957cd0	195
6fe7ccc8 A	196	if (m_codeBlock->usesArguments() && arguments == m_codeBlock->argumentsRegister())
	197	end.link(this);
	198	}
14957cd0	199
6fe7ccc8 A	200	void JIT::compileCallEval()
	201	{
	202	JITStubCall stubCall(this, cti_op_call_eval); // Initializes ScopeChain; ReturnPC; CodeBlock.
	203	stubCall.call();
	204	addSlowCase(branch32(Equal, regT1, TrustedImm32(JSValue::EmptyValueTag)));
	205	emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, callFrameRegister);
14957cd0 A	206
	207	sampleCodeBlock(m_codeBlock);
	208	}
	209
6fe7ccc8	210	void JIT::compileCallEvalSlowCase(Vector<SlowCaseEntry>::iterator& iter)
14957cd0	211	{
14957cd0 A	212	linkSlowCase(iter);
14957cd0 A	213
6fe7ccc8 A	214	emitLoad(RegisterFile::Callee, regT1, regT0);
6fe7ccc8 A	215	emitNakedCall(m_globalData->jitStubs->ctiVirtualCall());
14957cd0 A	216
	217	sampleCodeBlock(m_codeBlock);
	218	}
	219
14957cd0 A	220	void JIT::compileOpCall(OpcodeID opcodeID, Instruction* instruction, unsigned callLinkInfoIndex)
	221	{
	222	int callee = instruction[1].u.operand;
14957cd0	223
6fe7ccc8 A	224	/* Caller always:
	225	- Updates callFrameRegister to callee callFrame.
	226	- Initializes ArgumentCount; CallerFrame; Callee.
14957cd0	227
6fe7ccc8 A	228	For a JS call:
	229	- Caller initializes ScopeChain.
	230	- Callee initializes ReturnPC; CodeBlock.
	231	- Callee restores callFrameRegister before return.
14957cd0	232
6fe7ccc8 A	233	For a non-JS call:
	234	- Caller initializes ScopeChain; ReturnPC; CodeBlock.
	235	- Caller restores callFrameRegister after return.
	236	*/
	237
	238	if (opcodeID == op_call_varargs)
	239	compileLoadVarargs(instruction);
	240	else {
	241	int argCount = instruction[2].u.operand;
	242	int registerOffset = instruction[3].u.operand;
14957cd0	243
6fe7ccc8	244	addPtr(TrustedImm32(registerOffset * sizeof(Register)), callFrameRegister, regT3);
14957cd0	245
6fe7ccc8 A	246	store32(TrustedImm32(argCount), payloadFor(RegisterFile::ArgumentCount, regT3));
	247	} // regT3 holds newCallFrame with ArgumentCount initialized.
	248
	249	storePtr(TrustedImmPtr(instruction), tagFor(RegisterFile::ArgumentCount, callFrameRegister));
	250	emitLoad(callee, regT1, regT0); // regT1, regT0 holds callee.
14957cd0	251
6fe7ccc8 A	252	storePtr(callFrameRegister, Address(regT3, RegisterFile::CallerFrame * static_cast<int>(sizeof(Register))));
	253	emitStore(RegisterFile::Callee, regT1, regT0, regT3);
	254	move(regT3, callFrameRegister);
14957cd0	255
6fe7ccc8 A	256	if (opcodeID == op_call_eval) {
	257	compileCallEval();
	258	return;
	259	}
14957cd0	260
6fe7ccc8 A	261	DataLabelPtr addressOfLinkedFunctionCheck;
	262	BEGIN_UNINTERRUPTED_SEQUENCE(sequenceOpCall);
	263	Jump slowCase = branchPtrWithPatch(NotEqual, regT0, addressOfLinkedFunctionCheck, TrustedImmPtr(0));
	264	END_UNINTERRUPTED_SEQUENCE(sequenceOpCall);
14957cd0	265
6fe7ccc8 A	266	addSlowCase(slowCase);
6fe7ccc8 A	267	addSlowCase(branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag)));
14957cd0	268
6fe7ccc8 A	269	ASSERT(m_callStructureStubCompilationInfo.size() == callLinkInfoIndex);
	270	m_callStructureStubCompilationInfo.append(StructureStubCompilationInfo());
	271	m_callStructureStubCompilationInfo[callLinkInfoIndex].hotPathBegin = addressOfLinkedFunctionCheck;
	272	m_callStructureStubCompilationInfo[callLinkInfoIndex].callType = CallLinkInfo::callTypeFor(opcodeID);
	273	m_callStructureStubCompilationInfo[callLinkInfoIndex].bytecodeIndex = m_bytecodeOffset;
14957cd0	274
6fe7ccc8 A	275	loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_scopeChain)), regT1);
6fe7ccc8 A	276	emitPutCellToCallFrameHeader(regT1, RegisterFile::ScopeChain);
14957cd0	277	m_callStructureStubCompilationInfo[callLinkInfoIndex].hotPathOther = emitNakedCall();
14957cd0 A	278
	279	sampleCodeBlock(m_codeBlock);
	280	}
	281
6fe7ccc8	282	void JIT::compileOpCallSlowCase(OpcodeID opcodeID, Instruction*, Vector<SlowCaseEntry>::iterator& iter, unsigned callLinkInfoIndex)
14957cd0	283	{
6fe7ccc8 A	284	if (opcodeID == op_call_eval) {
	285	compileCallEvalSlowCase(iter);
	286	return;
	287	}
14957cd0 A	288
	289	linkSlowCase(iter);
	290	linkSlowCase(iter);
6fe7ccc8	291
14957cd0 A	292	m_callStructureStubCompilationInfo[callLinkInfoIndex].callReturnLocation = emitNakedCall(opcodeID == op_construct ? m_globalData->jitStubs->ctiVirtualConstructLink() : m_globalData->jitStubs->ctiVirtualCallLink());
14957cd0 A	293
14957cd0 A	294	sampleCodeBlock(m_codeBlock);
	295	}
	296
14957cd0 A	297	} // namespace JSC
	298
	299	#endif // USE(JSVALUE32_64)
	300	#endif // ENABLE(JIT)