JIT.h revision 231d4e3152a9c27a73b6ac7badbe6be673aa3ddf 
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#include "CodeBlock.h"
42#include "Interpreter.h"
43#include "JITCode.h"
44#include "JITStubs.h"
45#include "Opcode.h"
46#include "RegisterFile.h"
47#include "MacroAssembler.h"
48#include "Profiler.h"
49#include <bytecode/SamplingTool.h>
50#include <wtf/AlwaysInline.h>
51#include <wtf/Vector.h>
52
53namespace JSC {
54
55    class CodeBlock;
56    class JIT;
57    class JSPropertyNameIterator;
58    class Interpreter;
59    class Register;
60    class RegisterFile;
61    class ScopeChainNode;
62    class StructureChain;
63
64    struct CallLinkInfo;
65    struct Instruction;
66    struct OperandTypes;
67    struct PolymorphicAccessStructureList;
68    struct SimpleJumpTable;
69    struct StringJumpTable;
70    struct StructureStubInfo;
71
72    struct CallRecord {
73        MacroAssembler::Call from;
74        unsigned bytecodeIndex;
75        void* to;
76
77        CallRecord()
78        {
79        }
80
81        CallRecord(MacroAssembler::Call from, unsigned bytecodeIndex, void* to = 0)
82            : from(from)
83            , bytecodeIndex(bytecodeIndex)
84            , to(to)
85        {
86        }
87    };
88
89    struct JumpTable {
90        MacroAssembler::Jump from;
91        unsigned toBytecodeIndex;
92
93        JumpTable(MacroAssembler::Jump f, unsigned t)
94            : from(f)
95            , toBytecodeIndex(t)
96        {
97        }
98    };
99
100    struct SlowCaseEntry {
101        MacroAssembler::Jump from;
102        unsigned to;
103        unsigned hint;
104
105        SlowCaseEntry(MacroAssembler::Jump f, unsigned t, unsigned h = 0)
106            : from(f)
107            , to(t)
108            , hint(h)
109        {
110        }
111    };
112
113    struct SwitchRecord {
114        enum Type {
115            Immediate,
116            Character,
117            String
118        };
119
120        Type type;
121
122        union {
123            SimpleJumpTable* simpleJumpTable;
124            StringJumpTable* stringJumpTable;
125        } jumpTable;
126
127        unsigned bytecodeIndex;
128        unsigned defaultOffset;
129
130        SwitchRecord(SimpleJumpTable* jumpTable, unsigned bytecodeIndex, unsigned defaultOffset, Type type)
131            : type(type)
132            , bytecodeIndex(bytecodeIndex)
133            , defaultOffset(defaultOffset)
134        {
135            this->jumpTable.simpleJumpTable = jumpTable;
136        }
137
138        SwitchRecord(StringJumpTable* jumpTable, unsigned bytecodeIndex, unsigned defaultOffset)
139            : type(String)
140            , bytecodeIndex(bytecodeIndex)
141            , defaultOffset(defaultOffset)
142        {
143            this->jumpTable.stringJumpTable = jumpTable;
144        }
145    };
146
147    struct PropertyStubCompilationInfo {
148        MacroAssembler::Call callReturnLocation;
149        MacroAssembler::Label hotPathBegin;
150    };
151
152    struct StructureStubCompilationInfo {
153        MacroAssembler::DataLabelPtr hotPathBegin;
154        MacroAssembler::Call hotPathOther;
155        MacroAssembler::Call callReturnLocation;
156    };
157
158    struct MethodCallCompilationInfo {
159        MethodCallCompilationInfo(unsigned propertyAccessIndex)
160            : propertyAccessIndex(propertyAccessIndex)
161        {
162        }
163
164        MacroAssembler::DataLabelPtr structureToCompare;
165        unsigned propertyAccessIndex;
166    };
167
168    // Near calls can only be patched to other JIT code, regular calls can be patched to JIT code or relinked to stub functions.
169    void ctiPatchNearCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, MacroAssemblerCodePtr newCalleeFunction);
170    void ctiPatchCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, MacroAssemblerCodePtr newCalleeFunction);
171    void ctiPatchCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, FunctionPtr newCalleeFunction);
172
173    class JIT : private MacroAssembler {
174        friend class JITStubCall;
175
176        using MacroAssembler::Jump;
177        using MacroAssembler::JumpList;
178        using MacroAssembler::Label;
179
180        // NOTES:
181        //
182        // regT0 has two special meanings.  The return value from a stub
183        // call will always be in regT0, and by default (unless
184        // a register is specified) emitPutVirtualRegister() will store
185        // the value from regT0.
186        //
187        // regT3 is required to be callee-preserved.
188        //
189        // tempRegister2 is has no such dependencies.  It is important that
190        // on x86/x86-64 it is ecx for performance reasons, since the
191        // MacroAssembler will need to plant register swaps if it is not -
192        // however the code will still function correctly.
193#if PLATFORM(X86_64)
194        static const RegisterID returnValueRegister = X86Registers::eax;
195        static const RegisterID cachedResultRegister = X86Registers::eax;
196        static const RegisterID firstArgumentRegister = X86Registers::edi;
197
198        static const RegisterID timeoutCheckRegister = X86Registers::r12;
199        static const RegisterID callFrameRegister = X86Registers::r13;
200        static const RegisterID tagTypeNumberRegister = X86Registers::r14;
201        static const RegisterID tagMaskRegister = X86Registers::r15;
202
203        static const RegisterID regT0 = X86Registers::eax;
204        static const RegisterID regT1 = X86Registers::edx;
205        static const RegisterID regT2 = X86Registers::ecx;
206        static const RegisterID regT3 = X86Registers::ebx;
207
208        static const FPRegisterID fpRegT0 = X86Registers::xmm0;
209        static const FPRegisterID fpRegT1 = X86Registers::xmm1;
210        static const FPRegisterID fpRegT2 = X86Registers::xmm2;
211#elif PLATFORM(X86)
212        static const RegisterID returnValueRegister = X86Registers::eax;
213        static const RegisterID cachedResultRegister = X86Registers::eax;
214        // On x86 we always use fastcall conventions = but on
215        // OS X if might make more sense to just use regparm.
216        static const RegisterID firstArgumentRegister = X86Registers::ecx;
217
218        static const RegisterID timeoutCheckRegister = X86Registers::esi;
219        static const RegisterID callFrameRegister = X86Registers::edi;
220
221        static const RegisterID regT0 = X86Registers::eax;
222        static const RegisterID regT1 = X86Registers::edx;
223        static const RegisterID regT2 = X86Registers::ecx;
224        static const RegisterID regT3 = X86Registers::ebx;
225
226        static const FPRegisterID fpRegT0 = X86Registers::xmm0;
227        static const FPRegisterID fpRegT1 = X86Registers::xmm1;
228        static const FPRegisterID fpRegT2 = X86Registers::xmm2;
229#elif PLATFORM(ARM_THUMB2)
230        static const RegisterID returnValueRegister = ARMRegisters::r0;
231        static const RegisterID cachedResultRegister = ARMRegisters::r0;
232        static const RegisterID firstArgumentRegister = ARMRegisters::r0;
233
234        static const RegisterID regT0 = ARMRegisters::r0;
235        static const RegisterID regT1 = ARMRegisters::r1;
236        static const RegisterID regT2 = ARMRegisters::r2;
237        static const RegisterID regT3 = ARMRegisters::r4;
238
239        static const RegisterID callFrameRegister = ARMRegisters::r5;
240        static const RegisterID timeoutCheckRegister = ARMRegisters::r6;
241
242        static const FPRegisterID fpRegT0 = ARMRegisters::d0;
243        static const FPRegisterID fpRegT1 = ARMRegisters::d1;
244        static const FPRegisterID fpRegT2 = ARMRegisters::d2;
245#elif PLATFORM(ARM_TRADITIONAL)
246        static const RegisterID returnValueRegister = ARMRegisters::r0;
247        static const RegisterID cachedResultRegister = ARMRegisters::r0;
248        static const RegisterID firstArgumentRegister = ARMRegisters::r0;
249
250        static const RegisterID timeoutCheckRegister = ARMRegisters::r5;
251        static const RegisterID callFrameRegister = ARMRegisters::r4;
252        static const RegisterID ctiReturnRegister = ARMRegisters::r6;
253
254        static const RegisterID regT0 = ARMRegisters::r0;
255        static const RegisterID regT1 = ARMRegisters::r1;
256        static const RegisterID regT2 = ARMRegisters::r2;
257        // Callee preserved
258        static const RegisterID regT3 = ARMRegisters::r7;
259
260        static const RegisterID regS0 = ARMRegisters::S0;
261        // Callee preserved
262        static const RegisterID regS1 = ARMRegisters::S1;
263
264        static const RegisterID regStackPtr = ARMRegisters::sp;
265        static const RegisterID regLink = ARMRegisters::lr;
266
267        static const FPRegisterID fpRegT0 = ARMRegisters::d0;
268        static const FPRegisterID fpRegT1 = ARMRegisters::d1;
269        static const FPRegisterID fpRegT2 = ARMRegisters::d2;
270#else
271    #error "JIT not supported on this platform."
272#endif
273
274        static const int patchGetByIdDefaultStructure = -1;
275        // Magic number - initial offset cannot be representable as a signed 8bit value, or the X86Assembler
276        // will compress the displacement, and we may not be able to fit a patched offset.
277        static const int patchGetByIdDefaultOffset = 256;
278
279    public:
280        static JITCode compile(JSGlobalData* globalData, CodeBlock* codeBlock)
281        {
282            return JIT(globalData, codeBlock).privateCompile();
283        }
284
285        static void compileGetByIdProto(JSGlobalData* globalData, CallFrame* callFrame, CodeBlock* codeBlock, StructureStubInfo* stubInfo, Structure* structure, Structure* prototypeStructure, size_t cachedOffset, ReturnAddressPtr returnAddress)
286        {
287            JIT jit(globalData, codeBlock);
288            jit.privateCompileGetByIdProto(stubInfo, structure, prototypeStructure, cachedOffset, returnAddress, callFrame);
289        }
290
291        static void compileGetByIdSelfList(JSGlobalData* globalData, CodeBlock* codeBlock, StructureStubInfo* stubInfo, PolymorphicAccessStructureList* polymorphicStructures, int currentIndex, Structure* structure, size_t cachedOffset)
292        {
293            JIT jit(globalData, codeBlock);
294            jit.privateCompileGetByIdSelfList(stubInfo, polymorphicStructures, currentIndex, structure, cachedOffset);
295        }
296        static void compileGetByIdProtoList(JSGlobalData* globalData, CallFrame* callFrame, CodeBlock* codeBlock, StructureStubInfo* stubInfo, PolymorphicAccessStructureList* prototypeStructureList, int currentIndex, Structure* structure, Structure* prototypeStructure, size_t cachedOffset)
297        {
298            JIT jit(globalData, codeBlock);
299            jit.privateCompileGetByIdProtoList(stubInfo, prototypeStructureList, currentIndex, structure, prototypeStructure, cachedOffset, callFrame);
300        }
301        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)
302        {
303            JIT jit(globalData, codeBlock);
304            jit.privateCompileGetByIdChainList(stubInfo, prototypeStructureList, currentIndex, structure, chain, count, cachedOffset, callFrame);
305        }
306
307        static void compileGetByIdChain(JSGlobalData* globalData, CallFrame* callFrame, CodeBlock* codeBlock, StructureStubInfo* stubInfo, Structure* structure, StructureChain* chain, size_t count, size_t cachedOffset, ReturnAddressPtr returnAddress)
308        {
309            JIT jit(globalData, codeBlock);
310            jit.privateCompileGetByIdChain(stubInfo, structure, chain, count, cachedOffset, returnAddress, callFrame);
311        }
312
313        static void compilePutByIdTransition(JSGlobalData* globalData, CodeBlock* codeBlock, StructureStubInfo* stubInfo, Structure* oldStructure, Structure* newStructure, size_t cachedOffset, StructureChain* chain, ReturnAddressPtr returnAddress)
314        {
315            JIT jit(globalData, codeBlock);
316            jit.privateCompilePutByIdTransition(stubInfo, oldStructure, newStructure, cachedOffset, chain, returnAddress);
317        }
318
319        static void compileCTIMachineTrampolines(JSGlobalData* globalData, RefPtr<ExecutablePool>* executablePool, CodePtr* ctiStringLengthTrampoline, CodePtr* ctiVirtualCallLink, CodePtr* ctiVirtualCall, CodePtr* ctiNativeCallThunk)
320        {
321            JIT jit(globalData);
322            jit.privateCompileCTIMachineTrampolines(executablePool, globalData, ctiStringLengthTrampoline, ctiVirtualCallLink, ctiVirtualCall, ctiNativeCallThunk);
323        }
324
325        static void patchGetByIdSelf(CodeBlock* codeblock, StructureStubInfo*, Structure*, size_t cachedOffset, ReturnAddressPtr returnAddress);
326        static void patchPutByIdReplace(CodeBlock* codeblock, StructureStubInfo*, Structure*, size_t cachedOffset, ReturnAddressPtr returnAddress);
327        static void patchMethodCallProto(CodeBlock* codeblock, MethodCallLinkInfo&, JSFunction*, Structure*, JSObject*, ReturnAddressPtr);
328
329        static void compilePatchGetArrayLength(JSGlobalData* globalData, CodeBlock* codeBlock, ReturnAddressPtr returnAddress)
330        {
331            JIT jit(globalData, codeBlock);
332            return jit.privateCompilePatchGetArrayLength(returnAddress);
333        }
334
335        static void linkCall(JSFunction* callee, CodeBlock* callerCodeBlock, CodeBlock* calleeCodeBlock, JITCode&, CallLinkInfo*, int callerArgCount, JSGlobalData*);
336        static void unlinkCall(CallLinkInfo*);
337
338    private:
339        struct JSRInfo {
340            DataLabelPtr storeLocation;
341            Label target;
342
343            JSRInfo(DataLabelPtr storeLocation, Label targetLocation)
344                : storeLocation(storeLocation)
345                , target(targetLocation)
346            {
347            }
348        };
349
350        JIT(JSGlobalData*, CodeBlock* = 0);
351
352        void privateCompileMainPass();
353        void privateCompileLinkPass();
354        void privateCompileSlowCases();
355        JITCode privateCompile();
356        void privateCompileGetByIdProto(StructureStubInfo*, Structure*, Structure* prototypeStructure, size_t cachedOffset, ReturnAddressPtr returnAddress, CallFrame* callFrame);
357        void privateCompileGetByIdSelfList(StructureStubInfo*, PolymorphicAccessStructureList*, int, Structure*, size_t cachedOffset);
358        void privateCompileGetByIdProtoList(StructureStubInfo*, PolymorphicAccessStructureList*, int, Structure*, Structure* prototypeStructure, size_t cachedOffset, CallFrame* callFrame);
359        void privateCompileGetByIdChainList(StructureStubInfo*, PolymorphicAccessStructureList*, int, Structure*, StructureChain* chain, size_t count, size_t cachedOffset, CallFrame* callFrame);
360        void privateCompileGetByIdChain(StructureStubInfo*, Structure*, StructureChain*, size_t count, size_t cachedOffset, ReturnAddressPtr returnAddress, CallFrame* callFrame);
361        void privateCompilePutByIdTransition(StructureStubInfo*, Structure*, Structure*, size_t cachedOffset, StructureChain*, ReturnAddressPtr returnAddress);
362
363        void privateCompileCTIMachineTrampolines(RefPtr<ExecutablePool>* executablePool, JSGlobalData* data, CodePtr* ctiStringLengthTrampoline, CodePtr* ctiVirtualCallLink, CodePtr* ctiVirtualCall, CodePtr* ctiNativeCallThunk);
364        void privateCompilePatchGetArrayLength(ReturnAddressPtr returnAddress);
365
366        void addSlowCase(Jump);
367        void addSlowCase(JumpList);
368        void addJump(Jump, int);
369        void emitJumpSlowToHot(Jump, int);
370
371        void compileOpCall(OpcodeID, Instruction* instruction, unsigned callLinkInfoIndex);
372        void compileOpCallVarargs(Instruction* instruction);
373        void compileOpCallInitializeCallFrame();
374        void compileOpCallSetupArgs(Instruction*);
375        void compileOpCallVarargsSetupArgs(Instruction*);
376        void compileOpCallSlowCase(Instruction* instruction, Vector<SlowCaseEntry>::iterator& iter, unsigned callLinkInfoIndex, OpcodeID opcodeID);
377        void compileOpCallVarargsSlowCase(Instruction* instruction, Vector<SlowCaseEntry>::iterator& iter);
378        void compileOpConstructSetupArgs(Instruction*);
379
380        enum CompileOpStrictEqType { OpStrictEq, OpNStrictEq };
381        void compileOpStrictEq(Instruction* instruction, CompileOpStrictEqType type);
382        bool isOperandConstantImmediateDouble(unsigned src);
383
384        void emitLoadDouble(unsigned index, FPRegisterID value);
385        void emitLoadInt32ToDouble(unsigned index, FPRegisterID value);
386
387        Address addressFor(unsigned index, RegisterID base = callFrameRegister);
388
389#if USE(JSVALUE32_64)
390        Address tagFor(unsigned index, RegisterID base = callFrameRegister);
391        Address payloadFor(unsigned index, RegisterID base = callFrameRegister);
392
393        bool getOperandConstantImmediateInt(unsigned op1, unsigned op2, unsigned& op, int32_t& constant);
394
395        void emitLoadTag(unsigned index, RegisterID tag);
396        void emitLoadPayload(unsigned index, RegisterID payload);
397
398        void emitLoad(const JSValue& v, RegisterID tag, RegisterID payload);
399        void emitLoad(unsigned index, RegisterID tag, RegisterID payload, RegisterID base = callFrameRegister);
400        void emitLoad2(unsigned index1, RegisterID tag1, RegisterID payload1, unsigned index2, RegisterID tag2, RegisterID payload2);
401
402        void emitStore(unsigned index, RegisterID tag, RegisterID payload, RegisterID base = callFrameRegister);
403        void emitStore(unsigned index, const JSValue constant, RegisterID base = callFrameRegister);
404        void emitStoreInt32(unsigned index, RegisterID payload, bool indexIsInt32 = false);
405        void emitStoreInt32(unsigned index, Imm32 payload, bool indexIsInt32 = false);
406        void emitStoreCell(unsigned index, RegisterID payload, bool indexIsCell = false);
407        void emitStoreBool(unsigned index, RegisterID tag, bool indexIsBool = false);
408        void emitStoreDouble(unsigned index, FPRegisterID value);
409
410        bool isLabeled(unsigned bytecodeIndex);
411        void map(unsigned bytecodeIndex, unsigned virtualRegisterIndex, RegisterID tag, RegisterID payload);
412        void unmap(RegisterID);
413        void unmap();
414        bool isMapped(unsigned virtualRegisterIndex);
415        bool getMappedPayload(unsigned virtualRegisterIndex, RegisterID& payload);
416        bool getMappedTag(unsigned virtualRegisterIndex, RegisterID& tag);
417
418        void emitJumpSlowCaseIfNotJSCell(unsigned virtualRegisterIndex);
419        void emitJumpSlowCaseIfNotJSCell(unsigned virtualRegisterIndex, RegisterID tag);
420        void linkSlowCaseIfNotJSCell(Vector<SlowCaseEntry>::iterator&, unsigned virtualRegisterIndex);
421
422#if ENABLE(JIT_OPTIMIZE_PROPERTY_ACCESS)
423        void compileGetByIdHotPath();
424        void compileGetByIdSlowCase(int resultVReg, int baseVReg, Identifier* ident, Vector<SlowCaseEntry>::iterator& iter, bool isMethodCheck = false);
425#endif
426        void compileGetDirectOffset(RegisterID base, RegisterID resultTag, RegisterID resultPayload, Structure* structure, size_t cachedOffset);
427        void compileGetDirectOffset(JSObject* base, RegisterID temp, RegisterID resultTag, RegisterID resultPayload, size_t cachedOffset);
428        void compilePutDirectOffset(RegisterID base, RegisterID valueTag, RegisterID valuePayload, Structure* structure, size_t cachedOffset);
429
430        // Arithmetic opcode helpers
431        void emitAdd32Constant(unsigned dst, unsigned op, int32_t constant, ResultType opType);
432        void emitSub32Constant(unsigned dst, unsigned op, int32_t constant, ResultType opType);
433        void emitBinaryDoubleOp(OpcodeID, unsigned dst, unsigned op1, unsigned op2, OperandTypes, JumpList& notInt32Op1, JumpList& notInt32Op2, bool op1IsInRegisters = true, bool op2IsInRegisters = true);
434
435#if PLATFORM(X86)
436        // These architecture specific value are used to enable patching - see comment on op_put_by_id.
437        static const int patchOffsetPutByIdStructure = 7;
438        static const int patchOffsetPutByIdExternalLoad = 13;
439        static const int patchLengthPutByIdExternalLoad = 3;
440        static const int patchOffsetPutByIdPropertyMapOffset1 = 22;
441        static const int patchOffsetPutByIdPropertyMapOffset2 = 28;
442        // These architecture specific value are used to enable patching - see comment on op_get_by_id.
443        static const int patchOffsetGetByIdStructure = 7;
444        static const int patchOffsetGetByIdBranchToSlowCase = 13;
445        static const int patchOffsetGetByIdExternalLoad = 13;
446        static const int patchLengthGetByIdExternalLoad = 3;
447        static const int patchOffsetGetByIdPropertyMapOffset1 = 22;
448        static const int patchOffsetGetByIdPropertyMapOffset2 = 28;
449        static const int patchOffsetGetByIdPutResult = 28;
450#if ENABLE(OPCODE_SAMPLING) && USE(JIT_STUB_ARGUMENT_VA_LIST)
451        static const int patchOffsetGetByIdSlowCaseCall = 35;
452#elif ENABLE(OPCODE_SAMPLING)
453        static const int patchOffsetGetByIdSlowCaseCall = 37;
454#elif USE(JIT_STUB_ARGUMENT_VA_LIST)
455        static const int patchOffsetGetByIdSlowCaseCall = 25;
456#else
457        static const int patchOffsetGetByIdSlowCaseCall = 27;
458#endif
459        static const int patchOffsetOpCallCompareToJump = 6;
460
461        static const int patchOffsetMethodCheckProtoObj = 11;
462        static const int patchOffsetMethodCheckProtoStruct = 18;
463        static const int patchOffsetMethodCheckPutFunction = 29;
464#else
465#error "JSVALUE32_64 not supported on this platform."
466#endif
467
468#else // USE(JSVALUE32_64)
469        void emitGetVirtualRegister(int src, RegisterID dst);
470        void emitGetVirtualRegisters(int src1, RegisterID dst1, int src2, RegisterID dst2);
471        void emitPutVirtualRegister(unsigned dst, RegisterID from = regT0);
472
473        int32_t getConstantOperandImmediateInt(unsigned src);
474
475        void emitGetVariableObjectRegister(RegisterID variableObject, int index, RegisterID dst);
476        void emitPutVariableObjectRegister(RegisterID src, RegisterID variableObject, int index);
477
478        void killLastResultRegister();
479
480        Jump emitJumpIfJSCell(RegisterID);
481        Jump emitJumpIfBothJSCells(RegisterID, RegisterID, RegisterID);
482        void emitJumpSlowCaseIfJSCell(RegisterID);
483        Jump emitJumpIfNotJSCell(RegisterID);
484        void emitJumpSlowCaseIfNotJSCell(RegisterID);
485        void emitJumpSlowCaseIfNotJSCell(RegisterID, int VReg);
486#if USE(JSVALUE64)
487        JIT::Jump emitJumpIfImmediateNumber(RegisterID);
488        JIT::Jump emitJumpIfNotImmediateNumber(RegisterID);
489#else
490        JIT::Jump emitJumpIfImmediateNumber(RegisterID reg)
491        {
492            return emitJumpIfImmediateInteger(reg);
493        }
494
495        JIT::Jump emitJumpIfNotImmediateNumber(RegisterID reg)
496        {
497            return emitJumpIfNotImmediateInteger(reg);
498        }
499#endif
500        JIT::Jump emitJumpIfImmediateInteger(RegisterID);
501        JIT::Jump emitJumpIfNotImmediateInteger(RegisterID);
502        JIT::Jump emitJumpIfNotImmediateIntegers(RegisterID, RegisterID, RegisterID);
503        void emitJumpSlowCaseIfNotImmediateInteger(RegisterID);
504        void emitJumpSlowCaseIfNotImmediateNumber(RegisterID);
505        void emitJumpSlowCaseIfNotImmediateIntegers(RegisterID, RegisterID, RegisterID);
506
507#if !USE(JSVALUE64)
508        void emitFastArithDeTagImmediate(RegisterID);
509        Jump emitFastArithDeTagImmediateJumpIfZero(RegisterID);
510#endif
511        void emitFastArithReTagImmediate(RegisterID src, RegisterID dest);
512        void emitFastArithImmToInt(RegisterID);
513        void emitFastArithIntToImmNoCheck(RegisterID src, RegisterID dest);
514
515        void emitTagAsBoolImmediate(RegisterID reg);
516        void compileBinaryArithOp(OpcodeID, unsigned dst, unsigned src1, unsigned src2, OperandTypes opi);
517#if USE(JSVALUE64)
518        void compileBinaryArithOpSlowCase(OpcodeID, Vector<SlowCaseEntry>::iterator&, unsigned dst, unsigned src1, unsigned src2, OperandTypes, bool op1HasImmediateIntFastCase, bool op2HasImmediateIntFastCase);
519#else
520        void compileBinaryArithOpSlowCase(OpcodeID, Vector<SlowCaseEntry>::iterator&, unsigned dst, unsigned src1, unsigned src2, OperandTypes);
521#endif
522
523#if ENABLE(JIT_OPTIMIZE_PROPERTY_ACCESS)
524        void compileGetByIdHotPath(int resultVReg, int baseVReg, Identifier* ident, unsigned propertyAccessInstructionIndex);
525        void compileGetByIdSlowCase(int resultVReg, int baseVReg, Identifier* ident, Vector<SlowCaseEntry>::iterator& iter, bool isMethodCheck = false);
526#endif
527        void compileGetDirectOffset(RegisterID base, RegisterID result, Structure* structure, size_t cachedOffset);
528        void compileGetDirectOffset(JSObject* base, RegisterID temp, RegisterID result, size_t cachedOffset);
529        void compilePutDirectOffset(RegisterID base, RegisterID value, Structure* structure, size_t cachedOffset);
530
531#if PLATFORM(X86_64)
532        // These architecture specific value are used to enable patching - see comment on op_put_by_id.
533        static const int patchOffsetPutByIdStructure = 10;
534        static const int patchOffsetPutByIdExternalLoad = 20;
535        static const int patchLengthPutByIdExternalLoad = 4;
536        static const int patchOffsetPutByIdPropertyMapOffset = 31;
537        // These architecture specific value are used to enable patching - see comment on op_get_by_id.
538        static const int patchOffsetGetByIdStructure = 10;
539        static const int patchOffsetGetByIdBranchToSlowCase = 20;
540        static const int patchOffsetGetByIdExternalLoad = 20;
541        static const int patchLengthGetByIdExternalLoad = 4;
542        static const int patchOffsetGetByIdPropertyMapOffset = 31;
543        static const int patchOffsetGetByIdPutResult = 31;
544#if ENABLE(OPCODE_SAMPLING)
545        static const int patchOffsetGetByIdSlowCaseCall = 64;
546#else
547        static const int patchOffsetGetByIdSlowCaseCall = 41;
548#endif
549        static const int patchOffsetOpCallCompareToJump = 9;
550
551        static const int patchOffsetMethodCheckProtoObj = 20;
552        static const int patchOffsetMethodCheckProtoStruct = 30;
553        static const int patchOffsetMethodCheckPutFunction = 50;
554#elif PLATFORM(X86)
555        // These architecture specific value are used to enable patching - see comment on op_put_by_id.
556        static const int patchOffsetPutByIdStructure = 7;
557        static const int patchOffsetPutByIdExternalLoad = 13;
558        static const int patchLengthPutByIdExternalLoad = 3;
559        static const int patchOffsetPutByIdPropertyMapOffset = 22;
560        // These architecture specific value are used to enable patching - see comment on op_get_by_id.
561        static const int patchOffsetGetByIdStructure = 7;
562        static const int patchOffsetGetByIdBranchToSlowCase = 13;
563        static const int patchOffsetGetByIdExternalLoad = 13;
564        static const int patchLengthGetByIdExternalLoad = 3;
565        static const int patchOffsetGetByIdPropertyMapOffset = 22;
566        static const int patchOffsetGetByIdPutResult = 22;
567#if ENABLE(OPCODE_SAMPLING) && USE(JIT_STUB_ARGUMENT_VA_LIST)
568        static const int patchOffsetGetByIdSlowCaseCall = 31;
569#elif ENABLE(OPCODE_SAMPLING)
570        static const int patchOffsetGetByIdSlowCaseCall = 33;
571#elif USE(JIT_STUB_ARGUMENT_VA_LIST)
572        static const int patchOffsetGetByIdSlowCaseCall = 21;
573#else
574        static const int patchOffsetGetByIdSlowCaseCall = 23;
575#endif
576        static const int patchOffsetOpCallCompareToJump = 6;
577
578        static const int patchOffsetMethodCheckProtoObj = 11;
579        static const int patchOffsetMethodCheckProtoStruct = 18;
580        static const int patchOffsetMethodCheckPutFunction = 29;
581#elif PLATFORM(ARM_THUMB2)
582        // These architecture specific value are used to enable patching - see comment on op_put_by_id.
583        static const int patchOffsetPutByIdStructure = 10;
584        static const int patchOffsetPutByIdExternalLoad = 20;
585        static const int patchLengthPutByIdExternalLoad = 12;
586        static const int patchOffsetPutByIdPropertyMapOffset = 40;
587        // These architecture specific value are used to enable patching - see comment on op_get_by_id.
588        static const int patchOffsetGetByIdStructure = 10;
589        static const int patchOffsetGetByIdBranchToSlowCase = 20;
590        static const int patchOffsetGetByIdExternalLoad = 20;
591        static const int patchLengthGetByIdExternalLoad = 12;
592        static const int patchOffsetGetByIdPropertyMapOffset = 40;
593        static const int patchOffsetGetByIdPutResult = 44;
594#if ENABLE(OPCODE_SAMPLING)
595        static const int patchOffsetGetByIdSlowCaseCall = 0; // FIMXE
596#else
597        static const int patchOffsetGetByIdSlowCaseCall = 28;
598#endif
599        static const int patchOffsetOpCallCompareToJump = 10;
600
601        static const int patchOffsetMethodCheckProtoObj = 18;
602        static const int patchOffsetMethodCheckProtoStruct = 28;
603        static const int patchOffsetMethodCheckPutFunction = 46;
604#elif PLATFORM(ARM_TRADITIONAL)
605        // These architecture specific value are used to enable patching - see comment on op_put_by_id.
606        static const int patchOffsetPutByIdStructure = 4;
607        static const int patchOffsetPutByIdExternalLoad = 16;
608        static const int patchLengthPutByIdExternalLoad = 4;
609        static const int patchOffsetPutByIdPropertyMapOffset = 20;
610        // These architecture specific value are used to enable patching - see comment on op_get_by_id.
611        static const int patchOffsetGetByIdStructure = 4;
612        static const int patchOffsetGetByIdBranchToSlowCase = 16;
613        static const int patchOffsetGetByIdExternalLoad = 16;
614        static const int patchLengthGetByIdExternalLoad = 4;
615        static const int patchOffsetGetByIdPropertyMapOffset = 20;
616        static const int patchOffsetGetByIdPutResult = 28;
617#if ENABLE(OPCODE_SAMPLING)
618        #error "OPCODE_SAMPLING is not yet supported"
619#else
620        static const int patchOffsetGetByIdSlowCaseCall = 36;
621#endif
622        static const int patchOffsetOpCallCompareToJump = 12;
623
624        static const int patchOffsetMethodCheckProtoObj = 12;
625        static const int patchOffsetMethodCheckProtoStruct = 20;
626        static const int patchOffsetMethodCheckPutFunction = 32;
627#endif
628#endif // USE(JSVALUE32_64)
629
630#if PLATFORM(ARM_TRADITIONAL)
631        // sequenceOpCall
632        static const int sequenceOpCallInstructionSpace = 12;
633        static const int sequenceOpCallConstantSpace = 2;
634        // sequenceMethodCheck
635        static const int sequenceMethodCheckInstructionSpace = 40;
636        static const int sequenceMethodCheckConstantSpace = 6;
637        // sequenceGetByIdHotPath
638        static const int sequenceGetByIdHotPathInstructionSpace = 28;
639        static const int sequenceGetByIdHotPathConstantSpace = 3;
640        // sequenceGetByIdSlowCase
641        static const int sequenceGetByIdSlowCaseInstructionSpace = 40;
642        static const int sequenceGetByIdSlowCaseConstantSpace = 2;
643        // sequencePutById
644        static const int sequencePutByIdInstructionSpace = 28;
645        static const int sequencePutByIdConstantSpace = 3;
646#endif
647
648#if defined(ASSEMBLER_HAS_CONSTANT_POOL) && ASSEMBLER_HAS_CONSTANT_POOL
649#define BEGIN_UNINTERRUPTED_SEQUENCE(name) beginUninterruptedSequence(name ## InstructionSpace, name ## ConstantSpace)
650#define END_UNINTERRUPTED_SEQUENCE(name) endUninterruptedSequence(name ## InstructionSpace, name ## ConstantSpace)
651
652        void beginUninterruptedSequence(int, int);
653        void endUninterruptedSequence(int, int);
654
655#else
656#define BEGIN_UNINTERRUPTED_SEQUENCE(name)
657#define END_UNINTERRUPTED_SEQUENCE(name)
658#endif
659
660        void emit_op_add(Instruction*);
661        void emit_op_bitand(Instruction*);
662        void emit_op_bitnot(Instruction*);
663        void emit_op_bitor(Instruction*);
664        void emit_op_bitxor(Instruction*);
665        void emit_op_call(Instruction*);
666        void emit_op_call_eval(Instruction*);
667        void emit_op_call_varargs(Instruction*);
668        void emit_op_catch(Instruction*);
669        void emit_op_construct(Instruction*);
670        void emit_op_construct_verify(Instruction*);
671        void emit_op_convert_this(Instruction*);
672        void emit_op_create_arguments(Instruction*);
673        void emit_op_debug(Instruction*);
674        void emit_op_del_by_id(Instruction*);
675        void emit_op_div(Instruction*);
676        void emit_op_end(Instruction*);
677        void emit_op_enter(Instruction*);
678        void emit_op_enter_with_activation(Instruction*);
679        void emit_op_eq(Instruction*);
680        void emit_op_eq_null(Instruction*);
681        void emit_op_get_by_id(Instruction*);
682        void emit_op_get_by_val(Instruction*);
683        void emit_op_get_global_var(Instruction*);
684        void emit_op_get_scoped_var(Instruction*);
685        void emit_op_init_arguments(Instruction*);
686        void emit_op_instanceof(Instruction*);
687        void emit_op_jeq_null(Instruction*);
688        void emit_op_jfalse(Instruction*);
689        void emit_op_jmp(Instruction*);
690        void emit_op_jmp_scopes(Instruction*);
691        void emit_op_jneq_null(Instruction*);
692        void emit_op_jneq_ptr(Instruction*);
693        void emit_op_jnless(Instruction*);
694        void emit_op_jnlesseq(Instruction*);
695        void emit_op_jsr(Instruction*);
696        void emit_op_jtrue(Instruction*);
697        void emit_op_load_varargs(Instruction*);
698        void emit_op_loop(Instruction*);
699        void emit_op_loop_if_less(Instruction*);
700        void emit_op_loop_if_lesseq(Instruction*);
701        void emit_op_loop_if_true(Instruction*);
702        void emit_op_lshift(Instruction*);
703        void emit_op_method_check(Instruction*);
704        void emit_op_mod(Instruction*);
705        void emit_op_mov(Instruction*);
706        void emit_op_mul(Instruction*);
707        void emit_op_negate(Instruction*);
708        void emit_op_neq(Instruction*);
709        void emit_op_neq_null(Instruction*);
710        void emit_op_new_array(Instruction*);
711        void emit_op_new_error(Instruction*);
712        void emit_op_new_func(Instruction*);
713        void emit_op_new_func_exp(Instruction*);
714        void emit_op_new_object(Instruction*);
715        void emit_op_new_regexp(Instruction*);
716        void emit_op_next_pname(Instruction*);
717        void emit_op_not(Instruction*);
718        void emit_op_nstricteq(Instruction*);
719        void emit_op_pop_scope(Instruction*);
720        void emit_op_post_dec(Instruction*);
721        void emit_op_post_inc(Instruction*);
722        void emit_op_pre_dec(Instruction*);
723        void emit_op_pre_inc(Instruction*);
724        void emit_op_profile_did_call(Instruction*);
725        void emit_op_profile_will_call(Instruction*);
726        void emit_op_push_new_scope(Instruction*);
727        void emit_op_push_scope(Instruction*);
728        void emit_op_put_by_id(Instruction*);
729        void emit_op_put_by_index(Instruction*);
730        void emit_op_put_by_val(Instruction*);
731        void emit_op_put_getter(Instruction*);
732        void emit_op_put_global_var(Instruction*);
733        void emit_op_put_scoped_var(Instruction*);
734        void emit_op_put_setter(Instruction*);
735        void emit_op_resolve(Instruction*);
736        void emit_op_resolve_base(Instruction*);
737        void emit_op_resolve_global(Instruction*);
738        void emit_op_resolve_skip(Instruction*);
739        void emit_op_resolve_with_base(Instruction*);
740        void emit_op_ret(Instruction*);
741        void emit_op_rshift(Instruction*);
742        void emit_op_sret(Instruction*);
743        void emit_op_strcat(Instruction*);
744        void emit_op_stricteq(Instruction*);
745        void emit_op_sub(Instruction*);
746        void emit_op_switch_char(Instruction*);
747        void emit_op_switch_imm(Instruction*);
748        void emit_op_switch_string(Instruction*);
749        void emit_op_tear_off_activation(Instruction*);
750        void emit_op_tear_off_arguments(Instruction*);
751        void emit_op_throw(Instruction*);
752        void emit_op_to_jsnumber(Instruction*);
753        void emit_op_to_primitive(Instruction*);
754        void emit_op_unexpected_load(Instruction*);
755
756        void emitSlow_op_add(Instruction*, Vector<SlowCaseEntry>::iterator&);
757        void emitSlow_op_bitand(Instruction*, Vector<SlowCaseEntry>::iterator&);
758        void emitSlow_op_bitnot(Instruction*, Vector<SlowCaseEntry>::iterator&);
759        void emitSlow_op_bitor(Instruction*, Vector<SlowCaseEntry>::iterator&);
760        void emitSlow_op_bitxor(Instruction*, Vector<SlowCaseEntry>::iterator&);
761        void emitSlow_op_call(Instruction*, Vector<SlowCaseEntry>::iterator&);
762        void emitSlow_op_call_eval(Instruction*, Vector<SlowCaseEntry>::iterator&);
763        void emitSlow_op_call_varargs(Instruction*, Vector<SlowCaseEntry>::iterator&);
764        void emitSlow_op_construct(Instruction*, Vector<SlowCaseEntry>::iterator&);
765        void emitSlow_op_construct_verify(Instruction*, Vector<SlowCaseEntry>::iterator&);
766        void emitSlow_op_convert_this(Instruction*, Vector<SlowCaseEntry>::iterator&);
767        void emitSlow_op_div(Instruction*, Vector<SlowCaseEntry>::iterator&);
768        void emitSlow_op_eq(Instruction*, Vector<SlowCaseEntry>::iterator&);
769        void emitSlow_op_get_by_id(Instruction*, Vector<SlowCaseEntry>::iterator&);
770        void emitSlow_op_get_by_val(Instruction*, Vector<SlowCaseEntry>::iterator&);
771        void emitSlow_op_instanceof(Instruction*, Vector<SlowCaseEntry>::iterator&);
772        void emitSlow_op_jfalse(Instruction*, Vector<SlowCaseEntry>::iterator&);
773        void emitSlow_op_jnless(Instruction*, Vector<SlowCaseEntry>::iterator&);
774        void emitSlow_op_jnlesseq(Instruction*, Vector<SlowCaseEntry>::iterator&);
775        void emitSlow_op_jtrue(Instruction*, Vector<SlowCaseEntry>::iterator&);
776        void emitSlow_op_loop_if_less(Instruction*, Vector<SlowCaseEntry>::iterator&);
777        void emitSlow_op_loop_if_lesseq(Instruction*, Vector<SlowCaseEntry>::iterator&);
778        void emitSlow_op_loop_if_true(Instruction*, Vector<SlowCaseEntry>::iterator&);
779        void emitSlow_op_lshift(Instruction*, Vector<SlowCaseEntry>::iterator&);
780        void emitSlow_op_method_check(Instruction*, Vector<SlowCaseEntry>::iterator&);
781        void emitSlow_op_mod(Instruction*, Vector<SlowCaseEntry>::iterator&);
782        void emitSlow_op_mul(Instruction*, Vector<SlowCaseEntry>::iterator&);
783        void emitSlow_op_negate(Instruction*, Vector<SlowCaseEntry>::iterator&);
784        void emitSlow_op_neq(Instruction*, Vector<SlowCaseEntry>::iterator&);
785        void emitSlow_op_not(Instruction*, Vector<SlowCaseEntry>::iterator&);
786        void emitSlow_op_nstricteq(Instruction*, Vector<SlowCaseEntry>::iterator&);
787        void emitSlow_op_post_dec(Instruction*, Vector<SlowCaseEntry>::iterator&);
788        void emitSlow_op_post_inc(Instruction*, Vector<SlowCaseEntry>::iterator&);
789        void emitSlow_op_pre_dec(Instruction*, Vector<SlowCaseEntry>::iterator&);
790        void emitSlow_op_pre_inc(Instruction*, Vector<SlowCaseEntry>::iterator&);
791        void emitSlow_op_put_by_id(Instruction*, Vector<SlowCaseEntry>::iterator&);
792        void emitSlow_op_put_by_val(Instruction*, Vector<SlowCaseEntry>::iterator&);
793        void emitSlow_op_resolve_global(Instruction*, Vector<SlowCaseEntry>::iterator&);
794        void emitSlow_op_rshift(Instruction*, Vector<SlowCaseEntry>::iterator&);
795        void emitSlow_op_stricteq(Instruction*, Vector<SlowCaseEntry>::iterator&);
796        void emitSlow_op_sub(Instruction*, Vector<SlowCaseEntry>::iterator&);
797        void emitSlow_op_to_jsnumber(Instruction*, Vector<SlowCaseEntry>::iterator&);
798        void emitSlow_op_to_primitive(Instruction*, Vector<SlowCaseEntry>::iterator&);
799
800        /* These functions are deprecated: Please use JITStubCall instead. */
801        void emitPutJITStubArg(RegisterID src, unsigned argumentNumber);
802#if USE(JSVALUE32_64)
803        void emitPutJITStubArg(RegisterID tag, RegisterID payload, unsigned argumentNumber);
804        void emitPutJITStubArgFromVirtualRegister(unsigned src, unsigned argumentNumber, RegisterID scratch1, RegisterID scratch2);
805#else
806        void emitPutJITStubArgFromVirtualRegister(unsigned src, unsigned argumentNumber, RegisterID scratch);
807#endif
808        void emitPutJITStubArgConstant(unsigned value, unsigned argumentNumber);
809        void emitPutJITStubArgConstant(void* value, unsigned argumentNumber);
810        void emitGetJITStubArg(unsigned argumentNumber, RegisterID dst);
811
812        void emitInitRegister(unsigned dst);
813
814        void emitPutToCallFrameHeader(RegisterID from, RegisterFile::CallFrameHeaderEntry entry);
815        void emitPutImmediateToCallFrameHeader(void* value, RegisterFile::CallFrameHeaderEntry entry);
816        void emitGetFromCallFrameHeaderPtr(RegisterFile::CallFrameHeaderEntry entry, RegisterID to, RegisterID from = callFrameRegister);
817        void emitGetFromCallFrameHeader32(RegisterFile::CallFrameHeaderEntry entry, RegisterID to, RegisterID from = callFrameRegister);
818
819        JSValue getConstantOperand(unsigned src);
820        bool isOperandConstantImmediateInt(unsigned src);
821
822        Jump getSlowCase(Vector<SlowCaseEntry>::iterator& iter)
823        {
824            return iter++->from;
825        }
826        void linkSlowCase(Vector<SlowCaseEntry>::iterator& iter)
827        {
828            iter->from.link(this);
829            ++iter;
830        }
831        void linkSlowCaseIfNotJSCell(Vector<SlowCaseEntry>::iterator&, int vReg);
832
833        Jump checkStructure(RegisterID reg, Structure* structure);
834
835        void restoreArgumentReference();
836        void restoreArgumentReferenceForTrampoline();
837
838        Call emitNakedCall(CodePtr function = CodePtr());
839
840        void preserveReturnAddressAfterCall(RegisterID);
841        void restoreReturnAddressBeforeReturn(RegisterID);
842        void restoreReturnAddressBeforeReturn(Address);
843
844        void emitTimeoutCheck();
845#ifndef NDEBUG
846        void printBytecodeOperandTypes(unsigned src1, unsigned src2);
847#endif
848
849#if ENABLE(SAMPLING_FLAGS)
850        void setSamplingFlag(int32_t);
851        void clearSamplingFlag(int32_t);
852#endif
853
854#if ENABLE(SAMPLING_COUNTERS)
855        void emitCount(AbstractSamplingCounter&, uint32_t = 1);
856#endif
857
858#if ENABLE(OPCODE_SAMPLING)
859        void sampleInstruction(Instruction*, bool = false);
860#endif
861
862#if ENABLE(CODEBLOCK_SAMPLING)
863        void sampleCodeBlock(CodeBlock*);
864#else
865        void sampleCodeBlock(CodeBlock*) {}
866#endif
867
868        Interpreter* m_interpreter;
869        JSGlobalData* m_globalData;
870        CodeBlock* m_codeBlock;
871
872        Vector<CallRecord> m_calls;
873        Vector<Label> m_labels;
874        Vector<PropertyStubCompilationInfo> m_propertyAccessCompilationInfo;
875        Vector<StructureStubCompilationInfo> m_callStructureStubCompilationInfo;
876        Vector<MethodCallCompilationInfo> m_methodCallCompilationInfo;
877        Vector<JumpTable> m_jmpTable;
878
879        unsigned m_bytecodeIndex;
880        Vector<JSRInfo> m_jsrSites;
881        Vector<SlowCaseEntry> m_slowCases;
882        Vector<SwitchRecord> m_switches;
883
884        unsigned m_propertyAccessInstructionIndex;
885        unsigned m_globalResolveInfoIndex;
886        unsigned m_callLinkInfoIndex;
887
888#if USE(JSVALUE32_64)
889        unsigned m_jumpTargetIndex;
890        unsigned m_mappedBytecodeIndex;
891        unsigned m_mappedVirtualRegisterIndex;
892        RegisterID m_mappedTag;
893        RegisterID m_mappedPayload;
894#else
895        int m_lastResultBytecodeRegister;
896        unsigned m_jumpTargetsPosition;
897#endif
898
899#ifndef NDEBUG
900#if defined(ASSEMBLER_HAS_CONSTANT_POOL) && ASSEMBLER_HAS_CONSTANT_POOL
901        Label m_uninterruptedInstructionSequenceBegin;
902        int m_uninterruptedConstantSequenceBegin;
903#endif
904#endif
905    } JIT_CLASS_ALIGNMENT;
906} // namespace JSC
907
908#endif // ENABLE(JIT)
909
910#endif // JIT_h
911