JIT.h revision 8a0914b749bbe7da7768e07a7db5c6d4bb09472b 
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#ifndef JIT_h
27#define JIT_h
28
29#include <wtf/Platform.h>
30
31#if ENABLE(JIT)
32
33// We've run into some problems where changing the size of the class JIT leads to
34// performance fluctuations.  Try forcing alignment in an attempt to stabalize this.
35#if COMPILER(GCC)
36#define JIT_CLASS_ALIGNMENT __attribute__ ((aligned (32)))
37#else
38#define JIT_CLASS_ALIGNMENT
39#endif
40
41#define ASSERT_JIT_OFFSET(actual, expected) ASSERT_WITH_MESSAGE(actual == expected, "JIT Offset \"%s\" should be %d, not %d.\n", #expected, static_cast<int>(actual), static_cast<int>(expected));
42
43#include "CodeBlock.h"
44#include "Interpreter.h"
45#include "JITCode.h"
46#include "JITStubs.h"
47#include "Opcode.h"
48#include "RegisterFile.h"
49#include "MacroAssembler.h"
50#include "Profiler.h"
51#include <bytecode/SamplingTool.h>
52#include <wtf/AlwaysInline.h>
53#include <wtf/Vector.h>
54
55namespace JSC {
56
57    class CodeBlock;
58    class JIT;
59    class JSPropertyNameIterator;
60    class Interpreter;
61    class Register;
62    class RegisterFile;
63    class ScopeChainNode;
64    class StructureChain;
65
66    struct CallLinkInfo;
67    struct Instruction;
68    struct OperandTypes;
69    struct PolymorphicAccessStructureList;
70    struct SimpleJumpTable;
71    struct StringJumpTable;
72    struct StructureStubInfo;
73
74    struct CallRecord {
75        MacroAssembler::Call from;
76        unsigned bytecodeIndex;
77        void* to;
78
79        CallRecord()
80        {
81        }
82
83        CallRecord(MacroAssembler::Call from, unsigned bytecodeIndex, void* to = 0)
84            : from(from)
85            , bytecodeIndex(bytecodeIndex)
86            , to(to)
87        {
88        }
89    };
90
91    struct JumpTable {
92        MacroAssembler::Jump from;
93        unsigned toBytecodeIndex;
94
95        JumpTable(MacroAssembler::Jump f, unsigned t)
96            : from(f)
97            , toBytecodeIndex(t)
98        {
99        }
100    };
101
102    struct SlowCaseEntry {
103        MacroAssembler::Jump from;
104        unsigned to;
105        unsigned hint;
106
107        SlowCaseEntry(MacroAssembler::Jump f, unsigned t, unsigned h = 0)
108            : from(f)
109            , to(t)
110            , hint(h)
111        {
112        }
113    };
114
115    struct SwitchRecord {
116        enum Type {
117            Immediate,
118            Character,
119            String
120        };
121
122        Type type;
123
124        union {
125            SimpleJumpTable* simpleJumpTable;
126            StringJumpTable* stringJumpTable;
127        } jumpTable;
128
129        unsigned bytecodeIndex;
130        unsigned defaultOffset;
131
132        SwitchRecord(SimpleJumpTable* jumpTable, unsigned bytecodeIndex, unsigned defaultOffset, Type type)
133            : type(type)
134            , bytecodeIndex(bytecodeIndex)
135            , defaultOffset(defaultOffset)
136        {
137            this->jumpTable.simpleJumpTable = jumpTable;
138        }
139
140        SwitchRecord(StringJumpTable* jumpTable, unsigned bytecodeIndex, unsigned defaultOffset)
141            : type(String)
142            , bytecodeIndex(bytecodeIndex)
143            , defaultOffset(defaultOffset)
144        {
145            this->jumpTable.stringJumpTable = jumpTable;
146        }
147    };
148
149    struct PropertyStubCompilationInfo {
150        MacroAssembler::Call callReturnLocation;
151        MacroAssembler::Label hotPathBegin;
152    };
153
154    struct StructureStubCompilationInfo {
155        MacroAssembler::DataLabelPtr hotPathBegin;
156        MacroAssembler::Call hotPathOther;
157        MacroAssembler::Call callReturnLocation;
158    };
159
160    struct MethodCallCompilationInfo {
161        MethodCallCompilationInfo(unsigned propertyAccessIndex)
162            : propertyAccessIndex(propertyAccessIndex)
163        {
164        }
165
166        MacroAssembler::DataLabelPtr structureToCompare;
167        unsigned propertyAccessIndex;
168    };
169
170    // Near calls can only be patched to other JIT code, regular calls can be patched to JIT code or relinked to stub functions.
171    void ctiPatchNearCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, MacroAssemblerCodePtr newCalleeFunction);
172    void ctiPatchCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, MacroAssemblerCodePtr newCalleeFunction);
173    void ctiPatchCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, FunctionPtr newCalleeFunction);
174
175    class JIT : private MacroAssembler {
176        friend class JITStubCall;
177
178        using MacroAssembler::Jump;
179        using MacroAssembler::JumpList;
180        using MacroAssembler::Label;
181
182        // NOTES:
183        //
184        // regT0 has two special meanings.  The return value from a stub
185        // call will always be in regT0, and by default (unless
186        // a register is specified) emitPutVirtualRegister() will store
187        // the value from regT0.
188        //
189        // regT3 is required to be callee-preserved.
190        //
191        // tempRegister2 is has no such dependencies.  It is important that
192        // on x86/x86-64 it is ecx for performance reasons, since the
193        // MacroAssembler will need to plant register swaps if it is not -
194        // however the code will still function correctly.
195#if CPU(X86_64)
196        static const RegisterID returnValueRegister = X86Registers::eax;
197        static const RegisterID cachedResultRegister = X86Registers::eax;
198        static const RegisterID firstArgumentRegister = X86Registers::edi;
199
200        static const RegisterID timeoutCheckRegister = X86Registers::r12;
201        static const RegisterID callFrameRegister = X86Registers::r13;
202        static const RegisterID tagTypeNumberRegister = X86Registers::r14;
203        static const RegisterID tagMaskRegister = X86Registers::r15;
204
205        static const RegisterID regT0 = X86Registers::eax;
206        static const RegisterID regT1 = X86Registers::edx;
207        static const RegisterID regT2 = X86Registers::ecx;
208        static const RegisterID regT3 = X86Registers::ebx;
209
210        static const FPRegisterID fpRegT0 = X86Registers::xmm0;
211        static const FPRegisterID fpRegT1 = X86Registers::xmm1;
212        static const FPRegisterID fpRegT2 = X86Registers::xmm2;
213#elif CPU(X86)
214        static const RegisterID returnValueRegister = X86Registers::eax;
215        static const RegisterID cachedResultRegister = X86Registers::eax;
216        // On x86 we always use fastcall conventions = but on
217        // OS X if might make more sense to just use regparm.
218        static const RegisterID firstArgumentRegister = X86Registers::ecx;
219
220        static const RegisterID timeoutCheckRegister = X86Registers::esi;
221        static const RegisterID callFrameRegister = X86Registers::edi;
222
223        static const RegisterID regT0 = X86Registers::eax;
224        static const RegisterID regT1 = X86Registers::edx;
225        static const RegisterID regT2 = X86Registers::ecx;
226        static const RegisterID regT3 = X86Registers::ebx;
227
228        static const FPRegisterID fpRegT0 = X86Registers::xmm0;
229        static const FPRegisterID fpRegT1 = X86Registers::xmm1;
230        static const FPRegisterID fpRegT2 = X86Registers::xmm2;
231#elif CPU(ARM_THUMB2)
232        static const RegisterID returnValueRegister = ARMRegisters::r0;
233        static const RegisterID cachedResultRegister = ARMRegisters::r0;
234        static const RegisterID firstArgumentRegister = ARMRegisters::r0;
235
236        static const RegisterID regT0 = ARMRegisters::r0;
237        static const RegisterID regT1 = ARMRegisters::r1;
238        static const RegisterID regT2 = ARMRegisters::r2;
239        static const RegisterID regT3 = ARMRegisters::r4;
240
241        static const RegisterID callFrameRegister = ARMRegisters::r5;
242        static const RegisterID timeoutCheckRegister = ARMRegisters::r6;
243
244        static const FPRegisterID fpRegT0 = ARMRegisters::d0;
245        static const FPRegisterID fpRegT1 = ARMRegisters::d1;
246        static const FPRegisterID fpRegT2 = ARMRegisters::d2;
247#elif CPU(ARM_TRADITIONAL)
248        static const RegisterID returnValueRegister = ARMRegisters::r0;
249        static const RegisterID cachedResultRegister = ARMRegisters::r0;
250        static const RegisterID firstArgumentRegister = ARMRegisters::r0;
251
252        static const RegisterID timeoutCheckRegister = ARMRegisters::r5;
253        static const RegisterID callFrameRegister = ARMRegisters::r4;
254
255        static const RegisterID regT0 = ARMRegisters::r0;
256        static const RegisterID regT1 = ARMRegisters::r1;
257        static const RegisterID regT2 = ARMRegisters::r2;
258        // Callee preserved
259        static const RegisterID regT3 = ARMRegisters::r7;
260
261        static const RegisterID regS0 = ARMRegisters::S0;
262        // Callee preserved
263        static const RegisterID regS1 = ARMRegisters::S1;
264
265        static const RegisterID regStackPtr = ARMRegisters::sp;
266        static const RegisterID regLink = ARMRegisters::lr;
267
268        static const FPRegisterID fpRegT0 = ARMRegisters::d0;
269        static const FPRegisterID fpRegT1 = ARMRegisters::d1;
270        static const FPRegisterID fpRegT2 = ARMRegisters::d2;
271#else
272    #error "JIT not supported on this platform."
273#endif
274
275        static const int patchGetByIdDefaultStructure = -1;
276        // Magic number - initial offset cannot be representable as a signed 8bit value, or the X86Assembler
277        // will compress the displacement, and we may not be able to fit a patched offset.
278        static const int patchGetByIdDefaultOffset = 256;
279
280    public:
281        static JITCode compile(JSGlobalData* globalData, CodeBlock* codeBlock)
282        {
283            return JIT(globalData, codeBlock).privateCompile();
284        }
285
286        static void compileGetByIdProto(JSGlobalData* globalData, CallFrame* callFrame, CodeBlock* codeBlock, StructureStubInfo* stubInfo, Structure* structure, Structure* prototypeStructure, size_t cachedOffset, ReturnAddressPtr returnAddress)
287        {
288            JIT jit(globalData, codeBlock);
289            jit.privateCompileGetByIdProto(stubInfo, structure, prototypeStructure, cachedOffset, returnAddress, callFrame);
290        }
291
292        static void compileGetByIdSelfList(JSGlobalData* globalData, CodeBlock* codeBlock, StructureStubInfo* stubInfo, PolymorphicAccessStructureList* polymorphicStructures, int currentIndex, Structure* structure, size_t cachedOffset)
293        {
294            JIT jit(globalData, codeBlock);
295            jit.privateCompileGetByIdSelfList(stubInfo, polymorphicStructures, currentIndex, structure, cachedOffset);
296        }
297        static void compileGetByIdProtoList(JSGlobalData* globalData, CallFrame* callFrame, CodeBlock* codeBlock, StructureStubInfo* stubInfo, PolymorphicAccessStructureList* prototypeStructureList, int currentIndex, Structure* structure, Structure* prototypeStructure, size_t cachedOffset)
298        {
299            JIT jit(globalData, codeBlock);
300            jit.privateCompileGetByIdProtoList(stubInfo, prototypeStructureList, currentIndex, structure, prototypeStructure, cachedOffset, callFrame);
301        }
302        static void compileGetByIdChainList(JSGlobalData* globalData, CallFrame* callFrame, CodeBlock* codeBlock, StructureStubInfo* stubInfo, PolymorphicAccessStructureList* prototypeStructureList, int currentIndex, Structure* structure, StructureChain* chain, size_t count, size_t cachedOffset)
303        {
304            JIT jit(globalData, codeBlock);
305            jit.privateCompileGetByIdChainList(stubInfo, prototypeStructureList, currentIndex, structure, chain, count, cachedOffset, callFrame);
306        }
307
308        static void compileGetByIdChain(JSGlobalData* globalData, CallFrame* callFrame, CodeBlock* codeBlock, StructureStubInfo* stubInfo, Structure* structure, StructureChain* chain, size_t count, size_t cachedOffset, ReturnAddressPtr returnAddress)
309        {
310            JIT jit(globalData, codeBlock);
311            jit.privateCompileGetByIdChain(stubInfo, structure, chain, count, cachedOffset, returnAddress, callFrame);
312        }
313
314        static void compilePutByIdTransition(JSGlobalData* globalData, CodeBlock* codeBlock, StructureStubInfo* stubInfo, Structure* oldStructure, Structure* newStructure, size_t cachedOffset, StructureChain* chain, ReturnAddressPtr returnAddress)
315        {
316            JIT jit(globalData, codeBlock);
317            jit.privateCompilePutByIdTransition(stubInfo, oldStructure, newStructure, cachedOffset, chain, returnAddress);
318        }
319
320        static void compileCTIMachineTrampolines(JSGlobalData* globalData, RefPtr<ExecutablePool>* executablePool, TrampolineStructure *trampolines)
321        {
322            JIT jit(globalData);
323            jit.privateCompileCTIMachineTrampolines(executablePool, globalData, trampolines);
324        }
325
326        static void patchGetByIdSelf(CodeBlock* codeblock, StructureStubInfo*, Structure*, size_t cachedOffset, ReturnAddressPtr returnAddress);
327        static void patchPutByIdReplace(CodeBlock* codeblock, StructureStubInfo*, Structure*, size_t cachedOffset, ReturnAddressPtr returnAddress);
328        static void patchMethodCallProto(CodeBlock* codeblock, MethodCallLinkInfo&, JSFunction*, Structure*, JSObject*, ReturnAddressPtr);
329
330        static void compilePatchGetArrayLength(JSGlobalData* globalData, CodeBlock* codeBlock, ReturnAddressPtr returnAddress)
331        {
332            JIT jit(globalData, codeBlock);
333            return jit.privateCompilePatchGetArrayLength(returnAddress);
334        }
335
336        static void linkCall(JSFunction* callee, CodeBlock* callerCodeBlock, CodeBlock* calleeCodeBlock, JITCode&, CallLinkInfo*, int callerArgCount, JSGlobalData*);
337        static void unlinkCall(CallLinkInfo*);
338
339    private:
340        struct JSRInfo {
341            DataLabelPtr storeLocation;
342            Label target;
343
344            JSRInfo(DataLabelPtr storeLocation, Label targetLocation)
345                : storeLocation(storeLocation)
346                , target(targetLocation)
347            {
348            }
349        };
350
351        JIT(JSGlobalData*, CodeBlock* = 0);
352
353        void privateCompileMainPass();
354        void privateCompileLinkPass();
355        void privateCompileSlowCases();
356        JITCode privateCompile();
357        void privateCompileGetByIdProto(StructureStubInfo*, Structure*, Structure* prototypeStructure, size_t cachedOffset, ReturnAddressPtr returnAddress, CallFrame* callFrame);
358        void privateCompileGetByIdSelfList(StructureStubInfo*, PolymorphicAccessStructureList*, int, Structure*, size_t cachedOffset);
359        void privateCompileGetByIdProtoList(StructureStubInfo*, PolymorphicAccessStructureList*, int, Structure*, Structure* prototypeStructure, size_t cachedOffset, CallFrame* callFrame);
360        void privateCompileGetByIdChainList(StructureStubInfo*, PolymorphicAccessStructureList*, int, Structure*, StructureChain* chain, size_t count, size_t cachedOffset, CallFrame* callFrame);
361        void privateCompileGetByIdChain(StructureStubInfo*, Structure*, StructureChain*, size_t count, size_t cachedOffset, ReturnAddressPtr returnAddress, CallFrame* callFrame);
362        void privateCompilePutByIdTransition(StructureStubInfo*, Structure*, Structure*, size_t cachedOffset, StructureChain*, ReturnAddressPtr returnAddress);
363
364        void privateCompileCTIMachineTrampolines(RefPtr<ExecutablePool>* executablePool, JSGlobalData* data, TrampolineStructure *trampolines);
365        void privateCompilePatchGetArrayLength(ReturnAddressPtr returnAddress);
366
367        void addSlowCase(Jump);
368        void addSlowCase(JumpList);
369        void addJump(Jump, int);
370        void emitJumpSlowToHot(Jump, int);
371
372        void compileOpCall(OpcodeID, Instruction* instruction, unsigned callLinkInfoIndex);
373        void compileOpCallVarargs(Instruction* instruction);
374        void compileOpCallInitializeCallFrame();
375        void compileOpCallSetupArgs(Instruction*);
376        void compileOpCallVarargsSetupArgs(Instruction*);
377        void compileOpCallSlowCase(Instruction* instruction, Vector<SlowCaseEntry>::iterator& iter, unsigned callLinkInfoIndex, OpcodeID opcodeID);
378        void compileOpCallVarargsSlowCase(Instruction* instruction, Vector<SlowCaseEntry>::iterator& iter);
379        void compileOpConstructSetupArgs(Instruction*);
380
381        enum CompileOpStrictEqType { OpStrictEq, OpNStrictEq };
382        void compileOpStrictEq(Instruction* instruction, CompileOpStrictEqType type);
383        bool isOperandConstantImmediateDouble(unsigned src);
384
385        void emitLoadDouble(unsigned index, FPRegisterID value);
386        void emitLoadInt32ToDouble(unsigned index, FPRegisterID value);
387
388        Address addressFor(unsigned index, RegisterID base = callFrameRegister);
389
390        void testPrototype(Structure*, JumpList& failureCases);
391
392#if USE(JSVALUE32_64)
393        Address tagFor(unsigned index, RegisterID base = callFrameRegister);
394        Address payloadFor(unsigned index, RegisterID base = callFrameRegister);
395
396        bool getOperandConstantImmediateInt(unsigned op1, unsigned op2, unsigned& op, int32_t& constant);
397
398        void emitLoadTag(unsigned index, RegisterID tag);
399        void emitLoadPayload(unsigned index, RegisterID payload);
400
401        void emitLoad(const JSValue& v, RegisterID tag, RegisterID payload);
402        void emitLoad(unsigned index, RegisterID tag, RegisterID payload, RegisterID base = callFrameRegister);
403        void emitLoad2(unsigned index1, RegisterID tag1, RegisterID payload1, unsigned index2, RegisterID tag2, RegisterID payload2);
404
405        void emitStore(unsigned index, RegisterID tag, RegisterID payload, RegisterID base = callFrameRegister);
406        void emitStore(unsigned index, const JSValue constant, RegisterID base = callFrameRegister);
407        void emitStoreInt32(unsigned index, RegisterID payload, bool indexIsInt32 = false);
408        void emitStoreInt32(unsigned index, Imm32 payload, bool indexIsInt32 = false);
409        void emitStoreCell(unsigned index, RegisterID payload, bool indexIsCell = false);
410        void emitStoreBool(unsigned index, RegisterID tag, bool indexIsBool = false);
411        void emitStoreDouble(unsigned index, FPRegisterID value);
412
413        bool isLabeled(unsigned bytecodeIndex);
414        void map(unsigned bytecodeIndex, unsigned virtualRegisterIndex, RegisterID tag, RegisterID payload);
415        void unmap(RegisterID);
416        void unmap();
417        bool isMapped(unsigned virtualRegisterIndex);
418        bool getMappedPayload(unsigned virtualRegisterIndex, RegisterID& payload);
419        bool getMappedTag(unsigned virtualRegisterIndex, RegisterID& tag);
420
421        void emitJumpSlowCaseIfNotJSCell(unsigned virtualRegisterIndex);
422        void emitJumpSlowCaseIfNotJSCell(unsigned virtualRegisterIndex, RegisterID tag);
423        void linkSlowCaseIfNotJSCell(Vector<SlowCaseEntry>::iterator&, unsigned virtualRegisterIndex);
424
425#if ENABLE(JIT_OPTIMIZE_PROPERTY_ACCESS)
426        void compileGetByIdHotPath();
427        void compileGetByIdSlowCase(int resultVReg, int baseVReg, Identifier* ident, Vector<SlowCaseEntry>::iterator& iter, bool isMethodCheck = false);
428#endif
429        void compileGetDirectOffset(RegisterID base, RegisterID resultTag, RegisterID resultPayload, Structure* structure, size_t cachedOffset);
430        void compileGetDirectOffset(JSObject* base, RegisterID temp, RegisterID resultTag, RegisterID resultPayload, size_t cachedOffset);
431        void compileGetDirectOffset(RegisterID base, RegisterID resultTag, RegisterID resultPayload, RegisterID structure, RegisterID offset);
432        void compilePutDirectOffset(RegisterID base, RegisterID valueTag, RegisterID valuePayload, Structure* structure, size_t cachedOffset);
433
434        // Arithmetic opcode helpers
435        void emitAdd32Constant(unsigned dst, unsigned op, int32_t constant, ResultType opType);
436        void emitSub32Constant(unsigned dst, unsigned op, int32_t constant, ResultType opType);
437        void emitBinaryDoubleOp(OpcodeID, unsigned dst, unsigned op1, unsigned op2, OperandTypes, JumpList& notInt32Op1, JumpList& notInt32Op2, bool op1IsInRegisters = true, bool op2IsInRegisters = true);
438
439#if CPU(X86)
440        // These architecture specific value are used to enable patching - see comment on op_put_by_id.
441        static const int patchOffsetPutByIdStructure = 7;
442        static const int patchOffsetPutByIdExternalLoad = 13;
443        static const int patchLengthPutByIdExternalLoad = 3;
444        static const int patchOffsetPutByIdPropertyMapOffset1 = 22;
445        static const int patchOffsetPutByIdPropertyMapOffset2 = 28;
446        // These architecture specific value are used to enable patching - see comment on op_get_by_id.
447        static const int patchOffsetGetByIdStructure = 7;
448        static const int patchOffsetGetByIdBranchToSlowCase = 13;
449        static const int patchOffsetGetByIdExternalLoad = 13;
450        static const int patchLengthGetByIdExternalLoad = 3;
451        static const int patchOffsetGetByIdPropertyMapOffset1 = 22;
452        static const int patchOffsetGetByIdPropertyMapOffset2 = 28;
453        static const int patchOffsetGetByIdPutResult = 28;
454#if ENABLE(OPCODE_SAMPLING) && USE(JIT_STUB_ARGUMENT_VA_LIST)
455        static const int patchOffsetGetByIdSlowCaseCall = 35;
456#elif ENABLE(OPCODE_SAMPLING)
457        static const int patchOffsetGetByIdSlowCaseCall = 37;
458#elif USE(JIT_STUB_ARGUMENT_VA_LIST)
459        static const int patchOffsetGetByIdSlowCaseCall = 25;
460#else
461        static const int patchOffsetGetByIdSlowCaseCall = 27;
462#endif
463        static const int patchOffsetOpCallCompareToJump = 6;
464
465        static const int patchOffsetMethodCheckProtoObj = 11;
466        static const int patchOffsetMethodCheckProtoStruct = 18;
467        static const int patchOffsetMethodCheckPutFunction = 29;
468#elif CPU(ARM_TRADITIONAL)
469        // These architecture specific value are used to enable patching - see comment on op_put_by_id.
470        static const int patchOffsetPutByIdStructure = 4;
471        static const int patchOffsetPutByIdExternalLoad = 16;
472        static const int patchLengthPutByIdExternalLoad = 4;
473        static const int patchOffsetPutByIdPropertyMapOffset1 = 20;
474        static const int patchOffsetPutByIdPropertyMapOffset2 = 28;
475        // These architecture specific value are used to enable patching - see comment on op_get_by_id.
476        static const int patchOffsetGetByIdStructure = 4;
477        static const int patchOffsetGetByIdBranchToSlowCase = 16;
478        static const int patchOffsetGetByIdExternalLoad = 16;
479        static const int patchLengthGetByIdExternalLoad = 4;
480        static const int patchOffsetGetByIdPropertyMapOffset1 = 20;
481        static const int patchOffsetGetByIdPropertyMapOffset2 = 28;
482        static const int patchOffsetGetByIdPutResult = 36;
483#if ENABLE(OPCODE_SAMPLING)
484        #error "OPCODE_SAMPLING is not yet supported"
485#else
486        static const int patchOffsetGetByIdSlowCaseCall = 32;
487#endif
488        static const int patchOffsetOpCallCompareToJump = 12;
489
490        static const int patchOffsetMethodCheckProtoObj = 12;
491        static const int patchOffsetMethodCheckProtoStruct = 20;
492        static const int patchOffsetMethodCheckPutFunction = 32;
493
494        // sequenceOpCall
495        static const int sequenceOpCallInstructionSpace = 12;
496        static const int sequenceOpCallConstantSpace = 2;
497        // sequenceMethodCheck
498        static const int sequenceMethodCheckInstructionSpace = 40;
499        static const int sequenceMethodCheckConstantSpace = 6;
500        // sequenceGetByIdHotPath
501        static const int sequenceGetByIdHotPathInstructionSpace = 36;
502        static const int sequenceGetByIdHotPathConstantSpace = 4;
503        // sequenceGetByIdSlowCase
504        static const int sequenceGetByIdSlowCaseInstructionSpace = 40;
505        static const int sequenceGetByIdSlowCaseConstantSpace = 2;
506        // sequencePutById
507        static const int sequencePutByIdInstructionSpace = 36;
508        static const int sequencePutByIdConstantSpace = 4;
509#else
510#error "JSVALUE32_64 not supported on this platform."
511#endif
512
513#else // USE(JSVALUE32_64)
514        void emitGetVirtualRegister(int src, RegisterID dst);
515        void emitGetVirtualRegisters(int src1, RegisterID dst1, int src2, RegisterID dst2);
516        void emitPutVirtualRegister(unsigned dst, RegisterID from = regT0);
517
518        int32_t getConstantOperandImmediateInt(unsigned src);
519
520        void emitGetVariableObjectRegister(RegisterID variableObject, int index, RegisterID dst);
521        void emitPutVariableObjectRegister(RegisterID src, RegisterID variableObject, int index);
522
523        void killLastResultRegister();
524
525        Jump emitJumpIfJSCell(RegisterID);
526        Jump emitJumpIfBothJSCells(RegisterID, RegisterID, RegisterID);
527        void emitJumpSlowCaseIfJSCell(RegisterID);
528        Jump emitJumpIfNotJSCell(RegisterID);
529        void emitJumpSlowCaseIfNotJSCell(RegisterID);
530        void emitJumpSlowCaseIfNotJSCell(RegisterID, int VReg);
531#if USE(JSVALUE64)
532        JIT::Jump emitJumpIfImmediateNumber(RegisterID);
533        JIT::Jump emitJumpIfNotImmediateNumber(RegisterID);
534#else
535        JIT::Jump emitJumpIfImmediateNumber(RegisterID reg)
536        {
537            return emitJumpIfImmediateInteger(reg);
538        }
539
540        JIT::Jump emitJumpIfNotImmediateNumber(RegisterID reg)
541        {
542            return emitJumpIfNotImmediateInteger(reg);
543        }
544#endif
545        JIT::Jump emitJumpIfImmediateInteger(RegisterID);
546        JIT::Jump emitJumpIfNotImmediateInteger(RegisterID);
547        JIT::Jump emitJumpIfNotImmediateIntegers(RegisterID, RegisterID, RegisterID);
548        void emitJumpSlowCaseIfNotImmediateInteger(RegisterID);
549        void emitJumpSlowCaseIfNotImmediateNumber(RegisterID);
550        void emitJumpSlowCaseIfNotImmediateIntegers(RegisterID, RegisterID, RegisterID);
551
552#if !USE(JSVALUE64)
553        void emitFastArithDeTagImmediate(RegisterID);
554        Jump emitFastArithDeTagImmediateJumpIfZero(RegisterID);
555#endif
556        void emitFastArithReTagImmediate(RegisterID src, RegisterID dest);
557        void emitFastArithImmToInt(RegisterID);
558        void emitFastArithIntToImmNoCheck(RegisterID src, RegisterID dest);
559
560        void emitTagAsBoolImmediate(RegisterID reg);
561        void compileBinaryArithOp(OpcodeID, unsigned dst, unsigned src1, unsigned src2, OperandTypes opi);
562#if USE(JSVALUE64)
563        void compileBinaryArithOpSlowCase(OpcodeID, Vector<SlowCaseEntry>::iterator&, unsigned dst, unsigned src1, unsigned src2, OperandTypes, bool op1HasImmediateIntFastCase, bool op2HasImmediateIntFastCase);
564#else
565        void compileBinaryArithOpSlowCase(OpcodeID, Vector<SlowCaseEntry>::iterator&, unsigned dst, unsigned src1, unsigned src2, OperandTypes);
566#endif
567
568#if ENABLE(JIT_OPTIMIZE_PROPERTY_ACCESS)
569        void compileGetByIdHotPath(int resultVReg, int baseVReg, Identifier* ident, unsigned propertyAccessInstructionIndex);
570        void compileGetByIdSlowCase(int resultVReg, int baseVReg, Identifier* ident, Vector<SlowCaseEntry>::iterator& iter, bool isMethodCheck = false);
571#endif
572        void compileGetDirectOffset(RegisterID base, RegisterID result, Structure* structure, size_t cachedOffset);
573        void compileGetDirectOffset(JSObject* base, RegisterID temp, RegisterID result, size_t cachedOffset);
574        void compileGetDirectOffset(RegisterID base, RegisterID result, RegisterID structure, RegisterID offset, RegisterID scratch);
575        void compilePutDirectOffset(RegisterID base, RegisterID value, Structure* structure, size_t cachedOffset);
576
577#if CPU(X86_64)
578        // These architecture specific value are used to enable patching - see comment on op_put_by_id.
579        static const int patchOffsetPutByIdStructure = 10;
580        static const int patchOffsetPutByIdExternalLoad = 20;
581        static const int patchLengthPutByIdExternalLoad = 4;
582        static const int patchOffsetPutByIdPropertyMapOffset = 31;
583        // These architecture specific value are used to enable patching - see comment on op_get_by_id.
584        static const int patchOffsetGetByIdStructure = 10;
585        static const int patchOffsetGetByIdBranchToSlowCase = 20;
586        static const int patchOffsetGetByIdExternalLoad = 20;
587        static const int patchLengthGetByIdExternalLoad = 4;
588        static const int patchOffsetGetByIdPropertyMapOffset = 31;
589        static const int patchOffsetGetByIdPutResult = 31;
590#if ENABLE(OPCODE_SAMPLING)
591        static const int patchOffsetGetByIdSlowCaseCall = 64;
592#else
593        static const int patchOffsetGetByIdSlowCaseCall = 41;
594#endif
595        static const int patchOffsetOpCallCompareToJump = 9;
596
597        static const int patchOffsetMethodCheckProtoObj = 20;
598        static const int patchOffsetMethodCheckProtoStruct = 30;
599        static const int patchOffsetMethodCheckPutFunction = 50;
600#elif CPU(X86)
601        // These architecture specific value are used to enable patching - see comment on op_put_by_id.
602        static const int patchOffsetPutByIdStructure = 7;
603        static const int patchOffsetPutByIdExternalLoad = 13;
604        static const int patchLengthPutByIdExternalLoad = 3;
605        static const int patchOffsetPutByIdPropertyMapOffset = 22;
606        // These architecture specific value are used to enable patching - see comment on op_get_by_id.
607        static const int patchOffsetGetByIdStructure = 7;
608        static const int patchOffsetGetByIdBranchToSlowCase = 13;
609        static const int patchOffsetGetByIdExternalLoad = 13;
610        static const int patchLengthGetByIdExternalLoad = 3;
611        static const int patchOffsetGetByIdPropertyMapOffset = 22;
612        static const int patchOffsetGetByIdPutResult = 22;
613#if ENABLE(OPCODE_SAMPLING) && USE(JIT_STUB_ARGUMENT_VA_LIST)
614        static const int patchOffsetGetByIdSlowCaseCall = 31;
615#elif ENABLE(OPCODE_SAMPLING)
616        static const int patchOffsetGetByIdSlowCaseCall = 33;
617#elif USE(JIT_STUB_ARGUMENT_VA_LIST)
618        static const int patchOffsetGetByIdSlowCaseCall = 21;
619#else
620        static const int patchOffsetGetByIdSlowCaseCall = 23;
621#endif
622        static const int patchOffsetOpCallCompareToJump = 6;
623
624        static const int patchOffsetMethodCheckProtoObj = 11;
625        static const int patchOffsetMethodCheckProtoStruct = 18;
626        static const int patchOffsetMethodCheckPutFunction = 29;
627#elif CPU(ARM_THUMB2)
628        // These architecture specific value are used to enable patching - see comment on op_put_by_id.
629        static const int patchOffsetPutByIdStructure = 10;
630        static const int patchOffsetPutByIdExternalLoad = 26;
631        static const int patchLengthPutByIdExternalLoad = 12;
632        static const int patchOffsetPutByIdPropertyMapOffset = 46;
633        // These architecture specific value are used to enable patching - see comment on op_get_by_id.
634        static const int patchOffsetGetByIdStructure = 10;
635        static const int patchOffsetGetByIdBranchToSlowCase = 26;
636        static const int patchOffsetGetByIdExternalLoad = 26;
637        static const int patchLengthGetByIdExternalLoad = 12;
638        static const int patchOffsetGetByIdPropertyMapOffset = 46;
639        static const int patchOffsetGetByIdPutResult = 50;
640#if ENABLE(OPCODE_SAMPLING)
641        static const int patchOffsetGetByIdSlowCaseCall = 0; // FIMXE
642#else
643        static const int patchOffsetGetByIdSlowCaseCall = 28;
644#endif
645        static const int patchOffsetOpCallCompareToJump = 16;
646
647        static const int patchOffsetMethodCheckProtoObj = 24;
648        static const int patchOffsetMethodCheckProtoStruct = 34;
649        static const int patchOffsetMethodCheckPutFunction = 58;
650#elif CPU(ARM_TRADITIONAL)
651        // These architecture specific value are used to enable patching - see comment on op_put_by_id.
652        static const int patchOffsetPutByIdStructure = 4;
653        static const int patchOffsetPutByIdExternalLoad = 16;
654        static const int patchLengthPutByIdExternalLoad = 4;
655        static const int patchOffsetPutByIdPropertyMapOffset = 20;
656        // These architecture specific value are used to enable patching - see comment on op_get_by_id.
657        static const int patchOffsetGetByIdStructure = 4;
658        static const int patchOffsetGetByIdBranchToSlowCase = 16;
659        static const int patchOffsetGetByIdExternalLoad = 16;
660        static const int patchLengthGetByIdExternalLoad = 4;
661        static const int patchOffsetGetByIdPropertyMapOffset = 20;
662        static const int patchOffsetGetByIdPutResult = 28;
663#if ENABLE(OPCODE_SAMPLING)
664        #error "OPCODE_SAMPLING is not yet supported"
665#else
666        static const int patchOffsetGetByIdSlowCaseCall = 28;
667#endif
668        static const int patchOffsetOpCallCompareToJump = 12;
669
670        static const int patchOffsetMethodCheckProtoObj = 12;
671        static const int patchOffsetMethodCheckProtoStruct = 20;
672        static const int patchOffsetMethodCheckPutFunction = 32;
673
674        // sequenceOpCall
675        static const int sequenceOpCallInstructionSpace = 12;
676        static const int sequenceOpCallConstantSpace = 2;
677        // sequenceMethodCheck
678        static const int sequenceMethodCheckInstructionSpace = 40;
679        static const int sequenceMethodCheckConstantSpace = 6;
680        // sequenceGetByIdHotPath
681        static const int sequenceGetByIdHotPathInstructionSpace = 28;
682        static const int sequenceGetByIdHotPathConstantSpace = 3;
683        // sequenceGetByIdSlowCase
684        static const int sequenceGetByIdSlowCaseInstructionSpace = 32;
685        static const int sequenceGetByIdSlowCaseConstantSpace = 2;
686        // sequencePutById
687        static const int sequencePutByIdInstructionSpace = 28;
688        static const int sequencePutByIdConstantSpace = 3;
689#endif
690#endif // USE(JSVALUE32_64)
691
692#if defined(ASSEMBLER_HAS_CONSTANT_POOL) && ASSEMBLER_HAS_CONSTANT_POOL
693#define BEGIN_UNINTERRUPTED_SEQUENCE(name) beginUninterruptedSequence(name ## InstructionSpace, name ## ConstantSpace)
694#define END_UNINTERRUPTED_SEQUENCE(name) endUninterruptedSequence(name ## InstructionSpace, name ## ConstantSpace)
695
696        void beginUninterruptedSequence(int, int);
697        void endUninterruptedSequence(int, int);
698
699#else
700#define BEGIN_UNINTERRUPTED_SEQUENCE(name)
701#define END_UNINTERRUPTED_SEQUENCE(name)
702#endif
703
704        void emit_op_add(Instruction*);
705        void emit_op_bitand(Instruction*);
706        void emit_op_bitnot(Instruction*);
707        void emit_op_bitor(Instruction*);
708        void emit_op_bitxor(Instruction*);
709        void emit_op_call(Instruction*);
710        void emit_op_call_eval(Instruction*);
711        void emit_op_call_varargs(Instruction*);
712        void emit_op_catch(Instruction*);
713        void emit_op_construct(Instruction*);
714        void emit_op_construct_verify(Instruction*);
715        void emit_op_convert_this(Instruction*);
716        void emit_op_create_arguments(Instruction*);
717        void emit_op_debug(Instruction*);
718        void emit_op_del_by_id(Instruction*);
719        void emit_op_div(Instruction*);
720        void emit_op_end(Instruction*);
721        void emit_op_enter(Instruction*);
722        void emit_op_enter_with_activation(Instruction*);
723        void emit_op_eq(Instruction*);
724        void emit_op_eq_null(Instruction*);
725        void emit_op_get_by_id(Instruction*);
726        void emit_op_get_by_val(Instruction*);
727        void emit_op_get_by_pname(Instruction*);
728        void emit_op_get_global_var(Instruction*);
729        void emit_op_get_scoped_var(Instruction*);
730        void emit_op_init_arguments(Instruction*);
731        void emit_op_instanceof(Instruction*);
732        void emit_op_jeq_null(Instruction*);
733        void emit_op_jfalse(Instruction*);
734        void emit_op_jmp(Instruction*);
735        void emit_op_jmp_scopes(Instruction*);
736        void emit_op_jneq_null(Instruction*);
737        void emit_op_jneq_ptr(Instruction*);
738        void emit_op_jnless(Instruction*);
739        void emit_op_jless(Instruction*);
740        void emit_op_jnlesseq(Instruction*);
741        void emit_op_jsr(Instruction*);
742        void emit_op_jtrue(Instruction*);
743        void emit_op_load_varargs(Instruction*);
744        void emit_op_loop(Instruction*);
745        void emit_op_loop_if_less(Instruction*);
746        void emit_op_loop_if_lesseq(Instruction*);
747        void emit_op_loop_if_true(Instruction*);
748        void emit_op_loop_if_false(Instruction*);
749        void emit_op_lshift(Instruction*);
750        void emit_op_method_check(Instruction*);
751        void emit_op_mod(Instruction*);
752        void emit_op_mov(Instruction*);
753        void emit_op_mul(Instruction*);
754        void emit_op_negate(Instruction*);
755        void emit_op_neq(Instruction*);
756        void emit_op_neq_null(Instruction*);
757        void emit_op_new_array(Instruction*);
758        void emit_op_new_error(Instruction*);
759        void emit_op_new_func(Instruction*);
760        void emit_op_new_func_exp(Instruction*);
761        void emit_op_new_object(Instruction*);
762        void emit_op_new_regexp(Instruction*);
763        void emit_op_get_pnames(Instruction*);
764        void emit_op_next_pname(Instruction*);
765        void emit_op_not(Instruction*);
766        void emit_op_nstricteq(Instruction*);
767        void emit_op_pop_scope(Instruction*);
768        void emit_op_post_dec(Instruction*);
769        void emit_op_post_inc(Instruction*);
770        void emit_op_pre_dec(Instruction*);
771        void emit_op_pre_inc(Instruction*);
772        void emit_op_profile_did_call(Instruction*);
773        void emit_op_profile_will_call(Instruction*);
774        void emit_op_push_new_scope(Instruction*);
775        void emit_op_push_scope(Instruction*);
776        void emit_op_put_by_id(Instruction*);
777        void emit_op_put_by_index(Instruction*);
778        void emit_op_put_by_val(Instruction*);
779        void emit_op_put_getter(Instruction*);
780        void emit_op_put_global_var(Instruction*);
781        void emit_op_put_scoped_var(Instruction*);
782        void emit_op_put_setter(Instruction*);
783        void emit_op_resolve(Instruction*);
784        void emit_op_resolve_base(Instruction*);
785        void emit_op_resolve_global(Instruction*);
786        void emit_op_resolve_skip(Instruction*);
787        void emit_op_resolve_with_base(Instruction*);
788        void emit_op_ret(Instruction*);
789        void emit_op_rshift(Instruction*);
790        void emit_op_sret(Instruction*);
791        void emit_op_strcat(Instruction*);
792        void emit_op_stricteq(Instruction*);
793        void emit_op_sub(Instruction*);
794        void emit_op_switch_char(Instruction*);
795        void emit_op_switch_imm(Instruction*);
796        void emit_op_switch_string(Instruction*);
797        void emit_op_tear_off_activation(Instruction*);
798        void emit_op_tear_off_arguments(Instruction*);
799        void emit_op_throw(Instruction*);
800        void emit_op_to_jsnumber(Instruction*);
801        void emit_op_to_primitive(Instruction*);
802        void emit_op_unexpected_load(Instruction*);
803#if ENABLE(JIT_OPTIMIZE_MOD)
804        void softModulo();
805#endif
806
807        void emitSlow_op_add(Instruction*, Vector<SlowCaseEntry>::iterator&);
808        void emitSlow_op_bitand(Instruction*, Vector<SlowCaseEntry>::iterator&);
809        void emitSlow_op_bitnot(Instruction*, Vector<SlowCaseEntry>::iterator&);
810        void emitSlow_op_bitor(Instruction*, Vector<SlowCaseEntry>::iterator&);
811        void emitSlow_op_bitxor(Instruction*, Vector<SlowCaseEntry>::iterator&);
812        void emitSlow_op_call(Instruction*, Vector<SlowCaseEntry>::iterator&);
813        void emitSlow_op_call_eval(Instruction*, Vector<SlowCaseEntry>::iterator&);
814        void emitSlow_op_call_varargs(Instruction*, Vector<SlowCaseEntry>::iterator&);
815        void emitSlow_op_construct(Instruction*, Vector<SlowCaseEntry>::iterator&);
816        void emitSlow_op_construct_verify(Instruction*, Vector<SlowCaseEntry>::iterator&);
817        void emitSlow_op_convert_this(Instruction*, Vector<SlowCaseEntry>::iterator&);
818        void emitSlow_op_div(Instruction*, Vector<SlowCaseEntry>::iterator&);
819        void emitSlow_op_eq(Instruction*, Vector<SlowCaseEntry>::iterator&);
820        void emitSlow_op_get_by_id(Instruction*, Vector<SlowCaseEntry>::iterator&);
821        void emitSlow_op_get_by_val(Instruction*, Vector<SlowCaseEntry>::iterator&);
822        void emitSlow_op_get_by_pname(Instruction*, Vector<SlowCaseEntry>::iterator&);
823        void emitSlow_op_instanceof(Instruction*, Vector<SlowCaseEntry>::iterator&);
824        void emitSlow_op_jfalse(Instruction*, Vector<SlowCaseEntry>::iterator&);
825        void emitSlow_op_jnless(Instruction*, Vector<SlowCaseEntry>::iterator&);
826        void emitSlow_op_jless(Instruction*, Vector<SlowCaseEntry>::iterator&);
827        void emitSlow_op_jnlesseq(Instruction*, Vector<SlowCaseEntry>::iterator&);
828        void emitSlow_op_jtrue(Instruction*, Vector<SlowCaseEntry>::iterator&);
829        void emitSlow_op_loop_if_less(Instruction*, Vector<SlowCaseEntry>::iterator&);
830        void emitSlow_op_loop_if_lesseq(Instruction*, Vector<SlowCaseEntry>::iterator&);
831        void emitSlow_op_loop_if_true(Instruction*, Vector<SlowCaseEntry>::iterator&);
832        void emitSlow_op_loop_if_false(Instruction*, Vector<SlowCaseEntry>::iterator&);
833        void emitSlow_op_lshift(Instruction*, Vector<SlowCaseEntry>::iterator&);
834        void emitSlow_op_method_check(Instruction*, Vector<SlowCaseEntry>::iterator&);
835        void emitSlow_op_mod(Instruction*, Vector<SlowCaseEntry>::iterator&);
836        void emitSlow_op_mul(Instruction*, Vector<SlowCaseEntry>::iterator&);
837        void emitSlow_op_negate(Instruction*, Vector<SlowCaseEntry>::iterator&);
838        void emitSlow_op_neq(Instruction*, Vector<SlowCaseEntry>::iterator&);
839        void emitSlow_op_not(Instruction*, Vector<SlowCaseEntry>::iterator&);
840        void emitSlow_op_nstricteq(Instruction*, Vector<SlowCaseEntry>::iterator&);
841        void emitSlow_op_post_dec(Instruction*, Vector<SlowCaseEntry>::iterator&);
842        void emitSlow_op_post_inc(Instruction*, Vector<SlowCaseEntry>::iterator&);
843        void emitSlow_op_pre_dec(Instruction*, Vector<SlowCaseEntry>::iterator&);
844        void emitSlow_op_pre_inc(Instruction*, Vector<SlowCaseEntry>::iterator&);
845        void emitSlow_op_put_by_id(Instruction*, Vector<SlowCaseEntry>::iterator&);
846        void emitSlow_op_put_by_val(Instruction*, Vector<SlowCaseEntry>::iterator&);
847        void emitSlow_op_resolve_global(Instruction*, Vector<SlowCaseEntry>::iterator&);
848        void emitSlow_op_rshift(Instruction*, Vector<SlowCaseEntry>::iterator&);
849        void emitSlow_op_stricteq(Instruction*, Vector<SlowCaseEntry>::iterator&);
850        void emitSlow_op_sub(Instruction*, Vector<SlowCaseEntry>::iterator&);
851        void emitSlow_op_to_jsnumber(Instruction*, Vector<SlowCaseEntry>::iterator&);
852        void emitSlow_op_to_primitive(Instruction*, Vector<SlowCaseEntry>::iterator&);
853
854        /* These functions are deprecated: Please use JITStubCall instead. */
855        void emitPutJITStubArg(RegisterID src, unsigned argumentNumber);
856#if USE(JSVALUE32_64)
857        void emitPutJITStubArg(RegisterID tag, RegisterID payload, unsigned argumentNumber);
858        void emitPutJITStubArgFromVirtualRegister(unsigned src, unsigned argumentNumber, RegisterID scratch1, RegisterID scratch2);
859#else
860        void emitPutJITStubArgFromVirtualRegister(unsigned src, unsigned argumentNumber, RegisterID scratch);
861#endif
862        void emitPutJITStubArgConstant(unsigned value, unsigned argumentNumber);
863        void emitPutJITStubArgConstant(void* value, unsigned argumentNumber);
864        void emitGetJITStubArg(unsigned argumentNumber, RegisterID dst);
865
866        void emitInitRegister(unsigned dst);
867
868        void emitPutToCallFrameHeader(RegisterID from, RegisterFile::CallFrameHeaderEntry entry);
869        void emitPutImmediateToCallFrameHeader(void* value, RegisterFile::CallFrameHeaderEntry entry);
870        void emitGetFromCallFrameHeaderPtr(RegisterFile::CallFrameHeaderEntry entry, RegisterID to, RegisterID from = callFrameRegister);
871        void emitGetFromCallFrameHeader32(RegisterFile::CallFrameHeaderEntry entry, RegisterID to, RegisterID from = callFrameRegister);
872
873        JSValue getConstantOperand(unsigned src);
874        bool isOperandConstantImmediateInt(unsigned src);
875
876        Jump getSlowCase(Vector<SlowCaseEntry>::iterator& iter)
877        {
878            return iter++->from;
879        }
880        void linkSlowCase(Vector<SlowCaseEntry>::iterator& iter)
881        {
882            iter->from.link(this);
883            ++iter;
884        }
885        void linkSlowCaseIfNotJSCell(Vector<SlowCaseEntry>::iterator&, int vReg);
886
887        Jump checkStructure(RegisterID reg, Structure* structure);
888
889        void restoreArgumentReference();
890        void restoreArgumentReferenceForTrampoline();
891
892        Call emitNakedCall(CodePtr function = CodePtr());
893
894        void preserveReturnAddressAfterCall(RegisterID);
895        void restoreReturnAddressBeforeReturn(RegisterID);
896        void restoreReturnAddressBeforeReturn(Address);
897
898        void emitTimeoutCheck();
899#ifndef NDEBUG
900        void printBytecodeOperandTypes(unsigned src1, unsigned src2);
901#endif
902
903#if ENABLE(SAMPLING_FLAGS)
904        void setSamplingFlag(int32_t);
905        void clearSamplingFlag(int32_t);
906#endif
907
908#if ENABLE(SAMPLING_COUNTERS)
909        void emitCount(AbstractSamplingCounter&, uint32_t = 1);
910#endif
911
912#if ENABLE(OPCODE_SAMPLING)
913        void sampleInstruction(Instruction*, bool = false);
914#endif
915
916#if ENABLE(CODEBLOCK_SAMPLING)
917        void sampleCodeBlock(CodeBlock*);
918#else
919        void sampleCodeBlock(CodeBlock*) {}
920#endif
921
922        Interpreter* m_interpreter;
923        JSGlobalData* m_globalData;
924        CodeBlock* m_codeBlock;
925
926        Vector<CallRecord> m_calls;
927        Vector<Label> m_labels;
928        Vector<PropertyStubCompilationInfo> m_propertyAccessCompilationInfo;
929        Vector<StructureStubCompilationInfo> m_callStructureStubCompilationInfo;
930        Vector<MethodCallCompilationInfo> m_methodCallCompilationInfo;
931        Vector<JumpTable> m_jmpTable;
932
933        unsigned m_bytecodeIndex;
934        Vector<JSRInfo> m_jsrSites;
935        Vector<SlowCaseEntry> m_slowCases;
936        Vector<SwitchRecord> m_switches;
937
938        unsigned m_propertyAccessInstructionIndex;
939        unsigned m_globalResolveInfoIndex;
940        unsigned m_callLinkInfoIndex;
941
942#if USE(JSVALUE32_64)
943        unsigned m_jumpTargetIndex;
944        unsigned m_mappedBytecodeIndex;
945        unsigned m_mappedVirtualRegisterIndex;
946        RegisterID m_mappedTag;
947        RegisterID m_mappedPayload;
948#else
949        int m_lastResultBytecodeRegister;
950        unsigned m_jumpTargetsPosition;
951#endif
952
953#ifndef NDEBUG
954#if defined(ASSEMBLER_HAS_CONSTANT_POOL) && ASSEMBLER_HAS_CONSTANT_POOL
955        Label m_uninterruptedInstructionSequenceBegin;
956        int m_uninterruptedConstantSequenceBegin;
957#endif
958#endif
959    } JIT_CLASS_ALIGNMENT;
960
961    inline void JIT::emit_op_loop(Instruction* currentInstruction)
962    {
963        emitTimeoutCheck();
964        emit_op_jmp(currentInstruction);
965    }
966
967    inline void JIT::emit_op_loop_if_true(Instruction* currentInstruction)
968    {
969        emitTimeoutCheck();
970        emit_op_jtrue(currentInstruction);
971    }
972
973    inline void JIT::emitSlow_op_loop_if_true(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
974    {
975        emitSlow_op_jtrue(currentInstruction, iter);
976    }
977
978    inline void JIT::emit_op_loop_if_false(Instruction* currentInstruction)
979    {
980        emitTimeoutCheck();
981        emit_op_jfalse(currentInstruction);
982    }
983
984    inline void JIT::emitSlow_op_loop_if_false(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
985    {
986        emitSlow_op_jfalse(currentInstruction, iter);
987    }
988
989    inline void JIT::emit_op_loop_if_less(Instruction* currentInstruction)
990    {
991        emitTimeoutCheck();
992        emit_op_jless(currentInstruction);
993    }
994
995    inline void JIT::emitSlow_op_loop_if_less(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
996    {
997        emitSlow_op_jless(currentInstruction, iter);
998    }
999
1000} // namespace JSC
1001
1002#endif // ENABLE(JIT)
1003
1004#endif // JIT_h
1005