jit/JIT.h

   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 #if ENABLE(JIT)
  30
  31 // Verbose logging of code generation
  32 #define ENABLE_JIT_VERBOSE 0
  33 // Verbose logging for OSR-related code.
  34 #define ENABLE_JIT_VERBOSE_OSR 0
  35
  36 // We've run into some problems where changing the size of the class JIT leads to
  37 // performance fluctuations.  Try forcing alignment in an attempt to stabalize this.
  38 #if COMPILER(GCC)
  39 #define JIT_CLASS_ALIGNMENT __attribute__ ((aligned (32)))
  40 #else
  41 #define JIT_CLASS_ALIGNMENT
  42 #endif
  43
  44 #define ASSERT_JIT_OFFSET(actual, expected) ASSERT_WITH_MESSAGE(actual == expected, "JIT Offset \"%s\" should be %d, not %d.\n", #expected, static_cast<int>(expected), static_cast<int>(actual));
  45
  46 #include "CodeBlock.h"
  47 #include "CompactJITCodeMap.h"
  48 #include "Interpreter.h"
  49 #include "JSInterfaceJIT.h"
  50 #include "Opcode.h"
  51 #include "Profiler.h"
  52 #include <bytecode/SamplingTool.h>
  53
  54 namespace JSC {
  55
  56     class CodeBlock;
  57     class FunctionExecutable;
  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 bytecodeOffset;
  77         void* to;
  78
  79         CallRecord()
  80         {
  81         }
  82
  83         CallRecord(MacroAssembler::Call from, unsigned bytecodeOffset, void* to = 0)
  84             : from(from)
  85             , bytecodeOffset(bytecodeOffset)
  86             , to(to)
  87         {
  88         }
  89     };
  90
  91     struct JumpTable {
  92         MacroAssembler::Jump from;
  93         unsigned toBytecodeOffset;
  94
  95         JumpTable(MacroAssembler::Jump f, unsigned t)
  96             : from(f)
  97             , toBytecodeOffset(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 bytecodeOffset;
 130         unsigned defaultOffset;
 131
 132         SwitchRecord(SimpleJumpTable* jumpTable, unsigned bytecodeOffset, unsigned defaultOffset, Type type)
 133             : type(type)
 134             , bytecodeOffset(bytecodeOffset)
 135             , defaultOffset(defaultOffset)
 136         {
 137             this->jumpTable.simpleJumpTable = jumpTable;
 138         }
 139
 140         SwitchRecord(StringJumpTable* jumpTable, unsigned bytecodeOffset, unsigned defaultOffset)
 141             : type(String)
 142             , bytecodeOffset(bytecodeOffset)
 143             , defaultOffset(defaultOffset)
 144         {
 145             this->jumpTable.stringJumpTable = jumpTable;
 146         }
 147     };
 148
 149     enum PropertyStubGetById_T { PropertyStubGetById };
 150     enum PropertyStubPutById_T { PropertyStubPutById };
 151
 152     struct PropertyStubCompilationInfo {
 153         enum Type { GetById, PutById, MethodCheck } m_type;
 154
 155         unsigned bytecodeIndex;
 156         MacroAssembler::Call callReturnLocation;
 157         MacroAssembler::Label hotPathBegin;
 158         MacroAssembler::DataLabelPtr getStructureToCompare;
 159         MacroAssembler::PatchableJump getStructureCheck;
 160 #if USE(JSVALUE64)
 161         MacroAssembler::DataLabelCompact getDisplacementLabel;
 162 #else
 163         MacroAssembler::DataLabelCompact getDisplacementLabel1;
 164         MacroAssembler::DataLabelCompact getDisplacementLabel2;
 165 #endif
 166         MacroAssembler::Label getPutResult;
 167         MacroAssembler::Label getColdPathBegin;
 168         MacroAssembler::DataLabelPtr putStructureToCompare;
 169 #if USE(JSVALUE64)
 170         MacroAssembler::DataLabel32 putDisplacementLabel;
 171 #else
 172         MacroAssembler::DataLabel32 putDisplacementLabel1;
 173         MacroAssembler::DataLabel32 putDisplacementLabel2;
 174 #endif
 175         MacroAssembler::DataLabelPtr methodCheckStructureToCompare;
 176         MacroAssembler::DataLabelPtr methodCheckProtoObj;
 177         MacroAssembler::DataLabelPtr methodCheckProtoStructureToCompare;
 178         MacroAssembler::DataLabelPtr methodCheckPutFunction;
 179
 180 #if !ASSERT_DISABLED
 181         PropertyStubCompilationInfo()
 182             : bytecodeIndex(std::numeric_limits<unsigned>::max())
 183         {
 184         }
 185 #endif
 186
 187
 188         PropertyStubCompilationInfo(PropertyStubGetById_T, unsigned bytecodeIndex, MacroAssembler::Label hotPathBegin,
 189 #if USE(JSVALUE64)
 190             MacroAssembler::DataLabelPtr structureToCompare, MacroAssembler::PatchableJump structureCheck, MacroAssembler::DataLabelCompact displacementLabel, MacroAssembler::Label putResult)
 191 #else
 192             MacroAssembler::DataLabelPtr structureToCompare, MacroAssembler::PatchableJump structureCheck, MacroAssembler::DataLabelCompact displacementLabel1, MacroAssembler::DataLabelCompact displacementLabel2, MacroAssembler::Label putResult)
 193 #endif
 194             : m_type(GetById)
 195             , bytecodeIndex(bytecodeIndex)
 196             , hotPathBegin(hotPathBegin)
 197             , getStructureToCompare(structureToCompare)
 198             , getStructureCheck(structureCheck)
 199 #if USE(JSVALUE64)
 200             , getDisplacementLabel(displacementLabel)
 201 #else
 202             , getDisplacementLabel1(displacementLabel1)
 203             , getDisplacementLabel2(displacementLabel2)
 204 #endif
 205             , getPutResult(putResult)
 206         {
 207         }
 208
 209         PropertyStubCompilationInfo(PropertyStubPutById_T, unsigned bytecodeIndex, MacroAssembler::Label hotPathBegin,
 210 #if USE(JSVALUE64)
 211             MacroAssembler::DataLabelPtr structureToCompare, MacroAssembler::DataLabel32 displacementLabel)
 212 #else
 213             MacroAssembler::DataLabelPtr structureToCompare, MacroAssembler::DataLabel32 displacementLabel1, MacroAssembler::DataLabel32 displacementLabel2)
 214 #endif
 215             : m_type(PutById)
 216             , bytecodeIndex(bytecodeIndex)
 217             , hotPathBegin(hotPathBegin)
 218             , putStructureToCompare(structureToCompare)
 219 #if USE(JSVALUE64)
 220             , putDisplacementLabel(displacementLabel)
 221 #else
 222             , putDisplacementLabel1(displacementLabel1)
 223             , putDisplacementLabel2(displacementLabel2)
 224 #endif
 225         {
 226         }
 227
 228         void slowCaseInfo(PropertyStubGetById_T, MacroAssembler::Label coldPathBegin, MacroAssembler::Call call)
 229         {
 230             ASSERT(m_type == GetById || m_type == MethodCheck);
 231             callReturnLocation = call;
 232             getColdPathBegin = coldPathBegin;
 233         }
 234
 235         void slowCaseInfo(PropertyStubPutById_T, MacroAssembler::Call call)
 236         {
 237             ASSERT(m_type == PutById);
 238             callReturnLocation = call;
 239         }
 240
 241         void addMethodCheckInfo(MacroAssembler::DataLabelPtr structureToCompare, MacroAssembler::DataLabelPtr protoObj, MacroAssembler::DataLabelPtr protoStructureToCompare, MacroAssembler::DataLabelPtr putFunction)
 242         {
 243             m_type = MethodCheck;
 244             methodCheckStructureToCompare = structureToCompare;
 245             methodCheckProtoObj = protoObj;
 246             methodCheckProtoStructureToCompare = protoStructureToCompare;
 247             methodCheckPutFunction = putFunction;
 248         }
 249
 250         void copyToStubInfo(StructureStubInfo& info, LinkBuffer &patchBuffer);
 251     };
 252
 253     struct StructureStubCompilationInfo {
 254         MacroAssembler::DataLabelPtr hotPathBegin;
 255         MacroAssembler::Call hotPathOther;
 256         MacroAssembler::Call callReturnLocation;
 257         CallLinkInfo::CallType callType;
 258         unsigned bytecodeIndex;
 259     };
 260
 261     struct MethodCallCompilationInfo {
 262         MethodCallCompilationInfo(unsigned bytecodeIndex, unsigned propertyAccessIndex)
 263             : bytecodeIndex(bytecodeIndex)
 264             , propertyAccessIndex(propertyAccessIndex)
 265         {
 266         }
 267
 268         unsigned bytecodeIndex;
 269         MacroAssembler::DataLabelPtr structureToCompare;
 270         unsigned propertyAccessIndex;
 271     };
 272
 273     // Near calls can only be patched to other JIT code, regular calls can be patched to JIT code or relinked to stub functions.
 274     void ctiPatchNearCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, MacroAssemblerCodePtr newCalleeFunction);
 275     void ctiPatchCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, MacroAssemblerCodePtr newCalleeFunction);
 276     void ctiPatchCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, FunctionPtr newCalleeFunction);
 277
 278     class JIT : private JSInterfaceJIT {
 279         friend class JITStubCall;
 280         friend struct PropertyStubCompilationInfo;
 281
 282         using MacroAssembler::Jump;
 283         using MacroAssembler::JumpList;
 284         using MacroAssembler::Label;
 285
 286         static const int patchGetByIdDefaultStructure = -1;
 287         static const int patchGetByIdDefaultOffset = 0;
 288         // Magic number - initial offset cannot be representable as a signed 8bit value, or the X86Assembler
 289         // will compress the displacement, and we may not be able to fit a patched offset.
 290         static const int patchPutByIdDefaultOffset = 256;
 291
 292     public:
 293         static JITCode compile(JSGlobalData* globalData, CodeBlock* codeBlock, JITCompilationEffort effort, CodePtr* functionEntryArityCheck = 0)
 294         {
 295             return JIT(globalData, codeBlock).privateCompile(functionEntryArityCheck, effort);
 296         }
 297
 298         static void compileGetByIdProto(JSGlobalData* globalData, CallFrame* callFrame, CodeBlock* codeBlock, StructureStubInfo* stubInfo, Structure* structure, Structure* prototypeStructure, const Identifier& ident, const PropertySlot& slot, size_t cachedOffset, ReturnAddressPtr returnAddress)
 299         {
 300             JIT jit(globalData, codeBlock);
 301             jit.m_bytecodeOffset = stubInfo->bytecodeIndex;
 302             jit.privateCompileGetByIdProto(stubInfo, structure, prototypeStructure, ident, slot, cachedOffset, returnAddress, callFrame);
 303         }
 304
 305         static void compileGetByIdSelfList(JSGlobalData* globalData, CodeBlock* codeBlock, StructureStubInfo* stubInfo, PolymorphicAccessStructureList* polymorphicStructures, int currentIndex, Structure* structure, const Identifier& ident, const PropertySlot& slot, size_t cachedOffset)
 306         {
 307             JIT jit(globalData, codeBlock);
 308             jit.m_bytecodeOffset = stubInfo->bytecodeIndex;
 309             jit.privateCompileGetByIdSelfList(stubInfo, polymorphicStructures, currentIndex, structure, ident, slot, cachedOffset);
 310         }
 311         static void compileGetByIdProtoList(JSGlobalData* globalData, CallFrame* callFrame, CodeBlock* codeBlock, StructureStubInfo* stubInfo, PolymorphicAccessStructureList* prototypeStructureList, int currentIndex, Structure* structure, Structure* prototypeStructure, const Identifier& ident, const PropertySlot& slot, size_t cachedOffset)
 312         {
 313             JIT jit(globalData, codeBlock);
 314             jit.m_bytecodeOffset = stubInfo->bytecodeIndex;
 315             jit.privateCompileGetByIdProtoList(stubInfo, prototypeStructureList, currentIndex, structure, prototypeStructure, ident, slot, cachedOffset, callFrame);
 316         }
 317         static void compileGetByIdChainList(JSGlobalData* globalData, CallFrame* callFrame, CodeBlock* codeBlock, StructureStubInfo* stubInfo, PolymorphicAccessStructureList* prototypeStructureList, int currentIndex, Structure* structure, StructureChain* chain, size_t count, const Identifier& ident, const PropertySlot& slot, size_t cachedOffset)
 318         {
 319             JIT jit(globalData, codeBlock);
 320             jit.m_bytecodeOffset = stubInfo->bytecodeIndex;
 321             jit.privateCompileGetByIdChainList(stubInfo, prototypeStructureList, currentIndex, structure, chain, count, ident, slot, cachedOffset, callFrame);
 322         }
 323
 324         static void compileGetByIdChain(JSGlobalData* globalData, CallFrame* callFrame, CodeBlock* codeBlock, StructureStubInfo* stubInfo, Structure* structure, StructureChain* chain, size_t count, const Identifier& ident, const PropertySlot& slot, size_t cachedOffset, ReturnAddressPtr returnAddress)
 325         {
 326             JIT jit(globalData, codeBlock);
 327             jit.m_bytecodeOffset = stubInfo->bytecodeIndex;
 328             jit.privateCompileGetByIdChain(stubInfo, structure, chain, count, ident, slot, cachedOffset, returnAddress, callFrame);
 329         }
 330
 331         static void compilePutByIdTransition(JSGlobalData* globalData, CodeBlock* codeBlock, StructureStubInfo* stubInfo, Structure* oldStructure, Structure* newStructure, size_t cachedOffset, StructureChain* chain, ReturnAddressPtr returnAddress, bool direct)
 332         {
 333             JIT jit(globalData, codeBlock);
 334             jit.m_bytecodeOffset = stubInfo->bytecodeIndex;
 335             jit.privateCompilePutByIdTransition(stubInfo, oldStructure, newStructure, cachedOffset, chain, returnAddress, direct);
 336         }
 337
 338         static PassRefPtr<ExecutableMemoryHandle> compileCTIMachineTrampolines(JSGlobalData* globalData, TrampolineStructure *trampolines)
 339         {
 340             if (!globalData->canUseJIT())
 341                 return 0;
 342             JIT jit(globalData, 0);
 343             return jit.privateCompileCTIMachineTrampolines(globalData, trampolines);
 344         }
 345
 346         static CodeRef compileCTINativeCall(JSGlobalData* globalData, NativeFunction func)
 347         {
 348             if (!globalData->canUseJIT()) {
 349 #if ENABLE(LLINT)
 350                 return CodeRef::createLLIntCodeRef(llint_native_call_trampoline);
 351 #else
 352                 return CodeRef();
 353 #endif
 354             }
 355             JIT jit(globalData, 0);
 356             return jit.privateCompileCTINativeCall(globalData, func);
 357         }
 358
 359         static void resetPatchGetById(RepatchBuffer&, StructureStubInfo*);
 360         static void resetPatchPutById(RepatchBuffer&, StructureStubInfo*);
 361         static void patchGetByIdSelf(CodeBlock* codeblock, StructureStubInfo*, Structure*, size_t cachedOffset, ReturnAddressPtr returnAddress);
 362         static void patchPutByIdReplace(CodeBlock* codeblock, StructureStubInfo*, Structure*, size_t cachedOffset, ReturnAddressPtr returnAddress, bool direct);
 363         static void patchMethodCallProto(JSGlobalData&, CodeBlock* codeblock, MethodCallLinkInfo&, StructureStubInfo&, JSObject*, Structure*, JSObject*, ReturnAddressPtr);
 364
 365         static void compilePatchGetArrayLength(JSGlobalData* globalData, CodeBlock* codeBlock, ReturnAddressPtr returnAddress)
 366         {
 367             JIT jit(globalData, codeBlock);
 368             return jit.privateCompilePatchGetArrayLength(returnAddress);
 369         }
 370
 371         static void linkFor(JSFunction* callee, CodeBlock* callerCodeBlock, CodeBlock* calleeCodeBlock, CodePtr, CallLinkInfo*, JSGlobalData*, CodeSpecializationKind);
 372
 373     private:
 374         JIT(JSGlobalData*, CodeBlock* = 0);
 375
 376         void privateCompileMainPass();
 377         void privateCompileLinkPass();
 378         void privateCompileSlowCases();
 379         JITCode privateCompile(CodePtr* functionEntryArityCheck, JITCompilationEffort);
 380         void privateCompileGetByIdProto(StructureStubInfo*, Structure*, Structure* prototypeStructure, const Identifier&, const PropertySlot&, size_t cachedOffset, ReturnAddressPtr returnAddress, CallFrame* callFrame);
 381         void privateCompileGetByIdSelfList(StructureStubInfo*, PolymorphicAccessStructureList*, int, Structure*, const Identifier&, const PropertySlot&, size_t cachedOffset);
 382         void privateCompileGetByIdProtoList(StructureStubInfo*, PolymorphicAccessStructureList*, int, Structure*, Structure* prototypeStructure, const Identifier&, const PropertySlot&, size_t cachedOffset, CallFrame* callFrame);
 383         void privateCompileGetByIdChainList(StructureStubInfo*, PolymorphicAccessStructureList*, int, Structure*, StructureChain* chain, size_t count, const Identifier&, const PropertySlot&, size_t cachedOffset, CallFrame* callFrame);
 384         void privateCompileGetByIdChain(StructureStubInfo*, Structure*, StructureChain*, size_t count, const Identifier&, const PropertySlot&, size_t cachedOffset, ReturnAddressPtr returnAddress, CallFrame* callFrame);
 385         void privateCompilePutByIdTransition(StructureStubInfo*, Structure*, Structure*, size_t cachedOffset, StructureChain*, ReturnAddressPtr returnAddress, bool direct);
 386
 387         PassRefPtr<ExecutableMemoryHandle> privateCompileCTIMachineTrampolines(JSGlobalData*, TrampolineStructure*);
 388         Label privateCompileCTINativeCall(JSGlobalData*, bool isConstruct = false);
 389         CodeRef privateCompileCTINativeCall(JSGlobalData*, NativeFunction);
 390         void privateCompilePatchGetArrayLength(ReturnAddressPtr returnAddress);
 391
 392         static bool isDirectPutById(StructureStubInfo*);
 393
 394         void addSlowCase(Jump);
 395         void addSlowCase(JumpList);
 396         void addSlowCase();
 397         void addJump(Jump, int);
 398         void emitJumpSlowToHot(Jump, int);
 399
 400         void compileOpCall(OpcodeID, Instruction*, unsigned callLinkInfoIndex);
 401         void compileOpCallSlowCase(OpcodeID, Instruction*, Vector<SlowCaseEntry>::iterator&, unsigned callLinkInfoIndex);
 402         void compileLoadVarargs(Instruction*);
 403         void compileCallEval();
 404         void compileCallEvalSlowCase(Vector<SlowCaseEntry>::iterator&);
 405
 406         enum CompileOpStrictEqType { OpStrictEq, OpNStrictEq };
 407         void compileOpStrictEq(Instruction* instruction, CompileOpStrictEqType type);
 408         bool isOperandConstantImmediateDouble(unsigned src);
 409
 410         void emitLoadDouble(int index, FPRegisterID value);
 411         void emitLoadInt32ToDouble(int index, FPRegisterID value);
 412         Jump emitJumpIfNotObject(RegisterID structureReg);
 413         Jump emitJumpIfNotType(RegisterID baseReg, RegisterID scratchReg, JSType);
 414
 415         void testPrototype(JSValue, JumpList& failureCases);
 416
 417         enum WriteBarrierMode { UnconditionalWriteBarrier, ShouldFilterImmediates };
 418         // value register in write barrier is used before any scratch registers
 419         // so may safely be the same as either of the scratch registers.
 420         void emitWriteBarrier(RegisterID owner, RegisterID valueTag, RegisterID scratch, RegisterID scratch2, WriteBarrierMode, WriteBarrierUseKind);
 421         void emitWriteBarrier(JSCell* owner, RegisterID value, RegisterID scratch, WriteBarrierMode, WriteBarrierUseKind);
 422
 423         template<typename ClassType, bool destructor, typename StructureType> void emitAllocateBasicJSObject(StructureType, RegisterID result, RegisterID storagePtr);
 424         void emitAllocateBasicStorage(size_t, RegisterID result, RegisterID storagePtr);
 425         template<typename T> void emitAllocateJSFinalObject(T structure, RegisterID result, RegisterID storagePtr);
 426         void emitAllocateJSFunction(FunctionExecutable*, RegisterID scopeChain, RegisterID result, RegisterID storagePtr);
 427         void emitAllocateJSArray(unsigned valuesRegister, unsigned length, RegisterID cellResult, RegisterID storageResult, RegisterID storagePtr);
 428
 429 #if ENABLE(VALUE_PROFILER)
 430         // This assumes that the value to profile is in regT0 and that regT3 is available for
 431         // scratch.
 432         void emitValueProfilingSite(ValueProfile*);
 433         void emitValueProfilingSite(unsigned bytecodeOffset);
 434         void emitValueProfilingSite();
 435 #else
 436         void emitValueProfilingSite(unsigned) { }
 437         void emitValueProfilingSite() { }
 438 #endif
 439
 440 #if USE(JSVALUE32_64)
 441         bool getOperandConstantImmediateInt(unsigned op1, unsigned op2, unsigned& op, int32_t& constant);
 442
 443         void emitLoadTag(int index, RegisterID tag);
 444         void emitLoadPayload(int index, RegisterID payload);
 445
 446         void emitLoad(const JSValue& v, RegisterID tag, RegisterID payload);
 447         void emitLoad(int index, RegisterID tag, RegisterID payload, RegisterID base = callFrameRegister);
 448         void emitLoad2(int index1, RegisterID tag1, RegisterID payload1, int index2, RegisterID tag2, RegisterID payload2);
 449
 450         void emitStore(int index, RegisterID tag, RegisterID payload, RegisterID base = callFrameRegister);
 451         void emitStore(int index, const JSValue constant, RegisterID base = callFrameRegister);
 452         void emitStoreInt32(int index, RegisterID payload, bool indexIsInt32 = false);
 453         void emitStoreInt32(int index, TrustedImm32 payload, bool indexIsInt32 = false);
 454         void emitStoreAndMapInt32(int index, RegisterID tag, RegisterID payload, bool indexIsInt32, size_t opcodeLength);
 455         void emitStoreCell(int index, RegisterID payload, bool indexIsCell = false);
 456         void emitStoreBool(int index, RegisterID payload, bool indexIsBool = false);
 457         void emitStoreDouble(int index, FPRegisterID value);
 458
 459         bool isLabeled(unsigned bytecodeOffset);
 460         void map(unsigned bytecodeOffset, int virtualRegisterIndex, RegisterID tag, RegisterID payload);
 461         void unmap(RegisterID);
 462         void unmap();
 463         bool isMapped(int virtualRegisterIndex);
 464         bool getMappedPayload(int virtualRegisterIndex, RegisterID& payload);
 465         bool getMappedTag(int virtualRegisterIndex, RegisterID& tag);
 466
 467         void emitJumpSlowCaseIfNotJSCell(int virtualRegisterIndex);
 468         void emitJumpSlowCaseIfNotJSCell(int virtualRegisterIndex, RegisterID tag);
 469
 470         void compileGetByIdHotPath();
 471         void compileGetByIdSlowCase(int resultVReg, int baseVReg, Identifier* ident, Vector<SlowCaseEntry>::iterator& iter, bool isMethodCheck = false);
 472         void compileGetDirectOffset(RegisterID base, RegisterID resultTag, RegisterID resultPayload, size_t cachedOffset);
 473         void compileGetDirectOffset(JSObject* base, RegisterID resultTag, RegisterID resultPayload, size_t cachedOffset);
 474         void compileGetDirectOffset(RegisterID base, RegisterID resultTag, RegisterID resultPayload, RegisterID offset);
 475         void compilePutDirectOffset(RegisterID base, RegisterID valueTag, RegisterID valuePayload, size_t cachedOffset);
 476
 477         // Arithmetic opcode helpers
 478         void emitAdd32Constant(unsigned dst, unsigned op, int32_t constant, ResultType opType);
 479         void emitSub32Constant(unsigned dst, unsigned op, int32_t constant, ResultType opType);
 480         void emitBinaryDoubleOp(OpcodeID, unsigned dst, unsigned op1, unsigned op2, OperandTypes, JumpList& notInt32Op1, JumpList& notInt32Op2, bool op1IsInRegisters = true, bool op2IsInRegisters = true);
 481
 482 #if CPU(ARM_TRADITIONAL)
 483         // sequenceOpCall
 484         static const int sequenceOpCallInstructionSpace = 12;
 485         static const int sequenceOpCallConstantSpace = 2;
 486         // sequenceMethodCheck
 487         static const int sequenceMethodCheckInstructionSpace = 40;
 488         static const int sequenceMethodCheckConstantSpace = 6;
 489         // sequenceGetByIdHotPath
 490         static const int sequenceGetByIdHotPathInstructionSpace = 36;
 491         static const int sequenceGetByIdHotPathConstantSpace = 4;
 492         // sequenceGetByIdSlowCase
 493         static const int sequenceGetByIdSlowCaseInstructionSpace = 64;
 494         static const int sequenceGetByIdSlowCaseConstantSpace = 4;
 495         // sequencePutById
 496         static const int sequencePutByIdInstructionSpace = 36;
 497         static const int sequencePutByIdConstantSpace = 4;
 498 #elif CPU(SH4)
 499         // sequenceOpCall
 500         static const int sequenceOpCallInstructionSpace = 12;
 501         static const int sequenceOpCallConstantSpace = 2;
 502         // sequenceMethodCheck
 503         static const int sequenceMethodCheckInstructionSpace = 40;
 504         static const int sequenceMethodCheckConstantSpace = 6;
 505         // sequenceGetByIdHotPath
 506         static const int sequenceGetByIdHotPathInstructionSpace = 36;
 507         static const int sequenceGetByIdHotPathConstantSpace = 5;
 508         // sequenceGetByIdSlowCase
 509         static const int sequenceGetByIdSlowCaseInstructionSpace = 38;
 510         static const int sequenceGetByIdSlowCaseConstantSpace = 4;
 511         // sequencePutById
 512         static const int sequencePutByIdInstructionSpace = 36;
 513         static const int sequencePutByIdConstantSpace = 5;
 514 #endif
 515
 516 #else // USE(JSVALUE32_64)
 517         void emitGetVirtualRegister(int src, RegisterID dst);
 518         void emitGetVirtualRegisters(int src1, RegisterID dst1, int src2, RegisterID dst2);
 519         void emitPutVirtualRegister(unsigned dst, RegisterID from = regT0);
 520         void emitStoreCell(unsigned dst, RegisterID payload, bool /* only used in JSValue32_64 */ = false)
 521         {
 522             emitPutVirtualRegister(dst, payload);
 523         }
 524
 525         int32_t getConstantOperandImmediateInt(unsigned src);
 526
 527         void killLastResultRegister();
 528
 529         Jump emitJumpIfJSCell(RegisterID);
 530         Jump emitJumpIfBothJSCells(RegisterID, RegisterID, RegisterID);
 531         void emitJumpSlowCaseIfJSCell(RegisterID);
 532         Jump emitJumpIfNotJSCell(RegisterID);
 533         void emitJumpSlowCaseIfNotJSCell(RegisterID);
 534         void emitJumpSlowCaseIfNotJSCell(RegisterID, int VReg);
 535         Jump emitJumpIfImmediateInteger(RegisterID);
 536         Jump emitJumpIfNotImmediateInteger(RegisterID);
 537         Jump emitJumpIfNotImmediateIntegers(RegisterID, RegisterID, RegisterID);
 538         void emitJumpSlowCaseIfNotImmediateInteger(RegisterID);
 539         void emitJumpSlowCaseIfNotImmediateNumber(RegisterID);
 540         void emitJumpSlowCaseIfNotImmediateIntegers(RegisterID, RegisterID, RegisterID);
 541
 542         void emitFastArithReTagImmediate(RegisterID src, RegisterID dest);
 543         void emitFastArithIntToImmNoCheck(RegisterID src, RegisterID dest);
 544
 545         void emitTagAsBoolImmediate(RegisterID reg);
 546         void compileBinaryArithOp(OpcodeID, unsigned dst, unsigned src1, unsigned src2, OperandTypes opi);
 547         void compileBinaryArithOpSlowCase(OpcodeID, Vector<SlowCaseEntry>::iterator&, unsigned dst, unsigned src1, unsigned src2, OperandTypes, bool op1HasImmediateIntFastCase, bool op2HasImmediateIntFastCase);
 548
 549         void compileGetByIdHotPath(int baseVReg, Identifier*);
 550         void compileGetByIdSlowCase(int resultVReg, int baseVReg, Identifier* ident, Vector<SlowCaseEntry>::iterator& iter, bool isMethodCheck = false);
 551         void compileGetDirectOffset(RegisterID base, RegisterID result, size_t cachedOffset);
 552         void compileGetDirectOffset(JSObject* base, RegisterID result, size_t cachedOffset);
 553         void compileGetDirectOffset(RegisterID base, RegisterID result, RegisterID offset, RegisterID scratch);
 554         void compilePutDirectOffset(RegisterID base, RegisterID value, size_t cachedOffset);
 555
 556 #endif // USE(JSVALUE32_64)
 557
 558 #if (defined(ASSEMBLER_HAS_CONSTANT_POOL) && ASSEMBLER_HAS_CONSTANT_POOL)
 559 #define BEGIN_UNINTERRUPTED_SEQUENCE(name) do { beginUninterruptedSequence(name ## InstructionSpace, name ## ConstantSpace); } while (false)
 560 #define END_UNINTERRUPTED_SEQUENCE_FOR_PUT(name, dst) do { endUninterruptedSequence(name ## InstructionSpace, name ## ConstantSpace, dst); } while (false)
 561 #define END_UNINTERRUPTED_SEQUENCE(name) END_UNINTERRUPTED_SEQUENCE_FOR_PUT(name, 0)
 562
 563         void beginUninterruptedSequence(int, int);
 564         void endUninterruptedSequence(int, int, int);
 565
 566 #else
 567 #define BEGIN_UNINTERRUPTED_SEQUENCE(name)
 568 #define END_UNINTERRUPTED_SEQUENCE(name)
 569 #define END_UNINTERRUPTED_SEQUENCE_FOR_PUT(name, dst)
 570 #endif
 571
 572         void emit_compareAndJump(OpcodeID, unsigned op1, unsigned op2, unsigned target, RelationalCondition);
 573         void emit_compareAndJumpSlow(unsigned op1, unsigned op2, unsigned target, DoubleCondition, int (JIT_STUB *stub)(STUB_ARGS_DECLARATION), bool invert, Vector<SlowCaseEntry>::iterator&);
 574
 575         void emit_op_add(Instruction*);
 576         void emit_op_bitand(Instruction*);
 577         void emit_op_bitor(Instruction*);
 578         void emit_op_bitxor(Instruction*);
 579         void emit_op_call(Instruction*);
 580         void emit_op_call_eval(Instruction*);
 581         void emit_op_call_varargs(Instruction*);
 582         void emit_op_call_put_result(Instruction*);
 583         void emit_op_catch(Instruction*);
 584         void emit_op_construct(Instruction*);
 585         void emit_op_get_callee(Instruction*);
 586         void emit_op_create_this(Instruction*);
 587         void emit_op_convert_this(Instruction*);
 588         void emit_op_create_arguments(Instruction*);
 589         void emit_op_debug(Instruction*);
 590         void emit_op_del_by_id(Instruction*);
 591         void emit_op_div(Instruction*);
 592         void emit_op_end(Instruction*);
 593         void emit_op_enter(Instruction*);
 594         void emit_op_create_activation(Instruction*);
 595         void emit_op_eq(Instruction*);
 596         void emit_op_eq_null(Instruction*);
 597         void emit_op_get_by_id(Instruction*);
 598         void emit_op_get_arguments_length(Instruction*);
 599         void emit_op_get_by_val(Instruction*);
 600         void emit_op_get_argument_by_val(Instruction*);
 601         void emit_op_get_by_pname(Instruction*);
 602         void emit_op_get_global_var(Instruction*);
 603         void emit_op_get_scoped_var(Instruction*);
 604         void emit_op_init_lazy_reg(Instruction*);
 605         void emit_op_check_has_instance(Instruction*);
 606         void emit_op_instanceof(Instruction*);
 607         void emit_op_is_undefined(Instruction*);
 608         void emit_op_is_boolean(Instruction*);
 609         void emit_op_is_number(Instruction*);
 610         void emit_op_is_string(Instruction*);
 611         void emit_op_jeq_null(Instruction*);
 612         void emit_op_jfalse(Instruction*);
 613         void emit_op_jmp(Instruction*);
 614         void emit_op_jmp_scopes(Instruction*);
 615         void emit_op_jneq_null(Instruction*);
 616         void emit_op_jneq_ptr(Instruction*);
 617         void emit_op_jless(Instruction*);
 618         void emit_op_jlesseq(Instruction*);
 619         void emit_op_jgreater(Instruction*);
 620         void emit_op_jgreatereq(Instruction*);
 621         void emit_op_jnless(Instruction*);
 622         void emit_op_jnlesseq(Instruction*);
 623         void emit_op_jngreater(Instruction*);
 624         void emit_op_jngreatereq(Instruction*);
 625         void emit_op_jtrue(Instruction*);
 626         void emit_op_loop(Instruction*);
 627         void emit_op_loop_hint(Instruction*);
 628         void emit_op_loop_if_less(Instruction*);
 629         void emit_op_loop_if_lesseq(Instruction*);
 630         void emit_op_loop_if_greater(Instruction*);
 631         void emit_op_loop_if_greatereq(Instruction*);
 632         void emit_op_loop_if_true(Instruction*);
 633         void emit_op_loop_if_false(Instruction*);
 634         void emit_op_lshift(Instruction*);
 635         void emit_op_method_check(Instruction*);
 636         void emit_op_mod(Instruction*);
 637         void emit_op_mov(Instruction*);
 638         void emit_op_mul(Instruction*);
 639         void emit_op_negate(Instruction*);
 640         void emit_op_neq(Instruction*);
 641         void emit_op_neq_null(Instruction*);
 642         void emit_op_new_array(Instruction*);
 643         void emit_op_new_array_buffer(Instruction*);
 644         void emit_op_new_func(Instruction*);
 645         void emit_op_new_func_exp(Instruction*);
 646         void emit_op_new_object(Instruction*);
 647         void emit_op_new_regexp(Instruction*);
 648         void emit_op_get_pnames(Instruction*);
 649         void emit_op_next_pname(Instruction*);
 650         void emit_op_not(Instruction*);
 651         void emit_op_nstricteq(Instruction*);
 652         void emit_op_pop_scope(Instruction*);
 653         void emit_op_post_dec(Instruction*);
 654         void emit_op_post_inc(Instruction*);
 655         void emit_op_pre_dec(Instruction*);
 656         void emit_op_pre_inc(Instruction*);
 657         void emit_op_profile_did_call(Instruction*);
 658         void emit_op_profile_will_call(Instruction*);
 659         void emit_op_push_new_scope(Instruction*);
 660         void emit_op_push_scope(Instruction*);
 661         void emit_op_put_by_id(Instruction*);
 662         void emit_op_put_by_index(Instruction*);
 663         void emit_op_put_by_val(Instruction*);
 664         void emit_op_put_getter_setter(Instruction*);
 665         void emit_op_put_global_var(Instruction*);
 666         void emit_op_put_scoped_var(Instruction*);
 667         void emit_op_resolve(Instruction*);
 668         void emit_op_resolve_base(Instruction*);
 669         void emit_op_ensure_property_exists(Instruction*);
 670         void emit_op_resolve_global(Instruction*, bool dynamic = false);
 671         void emit_op_resolve_global_dynamic(Instruction*);
 672         void emit_op_resolve_skip(Instruction*);
 673         void emit_op_resolve_with_base(Instruction*);
 674         void emit_op_resolve_with_this(Instruction*);
 675         void emit_op_ret(Instruction*);
 676         void emit_op_ret_object_or_this(Instruction*);
 677         void emit_op_rshift(Instruction*);
 678         void emit_op_strcat(Instruction*);
 679         void emit_op_stricteq(Instruction*);
 680         void emit_op_sub(Instruction*);
 681         void emit_op_switch_char(Instruction*);
 682         void emit_op_switch_imm(Instruction*);
 683         void emit_op_switch_string(Instruction*);
 684         void emit_op_tear_off_activation(Instruction*);
 685         void emit_op_tear_off_arguments(Instruction*);
 686         void emit_op_throw(Instruction*);
 687         void emit_op_throw_reference_error(Instruction*);
 688         void emit_op_to_jsnumber(Instruction*);
 689         void emit_op_to_primitive(Instruction*);
 690         void emit_op_unexpected_load(Instruction*);
 691         void emit_op_urshift(Instruction*);
 692
 693         void emitSlow_op_add(Instruction*, Vector<SlowCaseEntry>::iterator&);
 694         void emitSlow_op_bitand(Instruction*, Vector<SlowCaseEntry>::iterator&);
 695         void emitSlow_op_bitor(Instruction*, Vector<SlowCaseEntry>::iterator&);
 696         void emitSlow_op_bitxor(Instruction*, Vector<SlowCaseEntry>::iterator&);
 697         void emitSlow_op_call(Instruction*, Vector<SlowCaseEntry>::iterator&);
 698         void emitSlow_op_call_eval(Instruction*, Vector<SlowCaseEntry>::iterator&);
 699         void emitSlow_op_call_varargs(Instruction*, Vector<SlowCaseEntry>::iterator&);
 700         void emitSlow_op_construct(Instruction*, Vector<SlowCaseEntry>::iterator&);
 701         void emitSlow_op_convert_this(Instruction*, Vector<SlowCaseEntry>::iterator&);
 702         void emitSlow_op_create_this(Instruction*, Vector<SlowCaseEntry>::iterator&);
 703         void emitSlow_op_div(Instruction*, Vector<SlowCaseEntry>::iterator&);
 704         void emitSlow_op_eq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 705         void emitSlow_op_get_by_id(Instruction*, Vector<SlowCaseEntry>::iterator&);
 706         void emitSlow_op_get_arguments_length(Instruction*, Vector<SlowCaseEntry>::iterator&);
 707         void emitSlow_op_get_by_val(Instruction*, Vector<SlowCaseEntry>::iterator&);
 708         void emitSlow_op_get_argument_by_val(Instruction*, Vector<SlowCaseEntry>::iterator&);
 709         void emitSlow_op_get_by_pname(Instruction*, Vector<SlowCaseEntry>::iterator&);
 710         void emitSlow_op_check_has_instance(Instruction*, Vector<SlowCaseEntry>::iterator&);
 711         void emitSlow_op_instanceof(Instruction*, Vector<SlowCaseEntry>::iterator&);
 712         void emitSlow_op_jfalse(Instruction*, Vector<SlowCaseEntry>::iterator&);
 713         void emitSlow_op_jless(Instruction*, Vector<SlowCaseEntry>::iterator&);
 714         void emitSlow_op_jlesseq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 715         void emitSlow_op_jgreater(Instruction*, Vector<SlowCaseEntry>::iterator&);
 716         void emitSlow_op_jgreatereq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 717         void emitSlow_op_jnless(Instruction*, Vector<SlowCaseEntry>::iterator&);
 718         void emitSlow_op_jnlesseq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 719         void emitSlow_op_jngreater(Instruction*, Vector<SlowCaseEntry>::iterator&);
 720         void emitSlow_op_jngreatereq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 721         void emitSlow_op_jtrue(Instruction*, Vector<SlowCaseEntry>::iterator&);
 722         void emitSlow_op_loop_if_less(Instruction*, Vector<SlowCaseEntry>::iterator&);
 723         void emitSlow_op_loop_if_lesseq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 724         void emitSlow_op_loop_if_greater(Instruction*, Vector<SlowCaseEntry>::iterator&);
 725         void emitSlow_op_loop_if_greatereq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 726         void emitSlow_op_loop_if_true(Instruction*, Vector<SlowCaseEntry>::iterator&);
 727         void emitSlow_op_loop_if_false(Instruction*, Vector<SlowCaseEntry>::iterator&);
 728         void emitSlow_op_lshift(Instruction*, Vector<SlowCaseEntry>::iterator&);
 729         void emitSlow_op_method_check(Instruction*, Vector<SlowCaseEntry>::iterator&);
 730         void emitSlow_op_mod(Instruction*, Vector<SlowCaseEntry>::iterator&);
 731         void emitSlow_op_mul(Instruction*, Vector<SlowCaseEntry>::iterator&);
 732         void emitSlow_op_negate(Instruction*, Vector<SlowCaseEntry>::iterator&);
 733         void emitSlow_op_neq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 734         void emitSlow_op_new_object(Instruction*, Vector<SlowCaseEntry>::iterator&);
 735         void emitSlow_op_not(Instruction*, Vector<SlowCaseEntry>::iterator&);
 736         void emitSlow_op_nstricteq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 737         void emitSlow_op_post_dec(Instruction*, Vector<SlowCaseEntry>::iterator&);
 738         void emitSlow_op_post_inc(Instruction*, Vector<SlowCaseEntry>::iterator&);
 739         void emitSlow_op_pre_dec(Instruction*, Vector<SlowCaseEntry>::iterator&);
 740         void emitSlow_op_pre_inc(Instruction*, Vector<SlowCaseEntry>::iterator&);
 741         void emitSlow_op_put_by_id(Instruction*, Vector<SlowCaseEntry>::iterator&);
 742         void emitSlow_op_put_by_val(Instruction*, Vector<SlowCaseEntry>::iterator&);
 743         void emitSlow_op_resolve_global(Instruction*, Vector<SlowCaseEntry>::iterator&);
 744         void emitSlow_op_resolve_global_dynamic(Instruction*, Vector<SlowCaseEntry>::iterator&);
 745         void emitSlow_op_rshift(Instruction*, Vector<SlowCaseEntry>::iterator&);
 746         void emitSlow_op_stricteq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 747         void emitSlow_op_sub(Instruction*, Vector<SlowCaseEntry>::iterator&);
 748         void emitSlow_op_to_jsnumber(Instruction*, Vector<SlowCaseEntry>::iterator&);
 749         void emitSlow_op_to_primitive(Instruction*, Vector<SlowCaseEntry>::iterator&);
 750         void emitSlow_op_urshift(Instruction*, Vector<SlowCaseEntry>::iterator&);
 751         void emitSlow_op_new_func(Instruction*, Vector<SlowCaseEntry>::iterator&);
 752         void emitSlow_op_new_func_exp(Instruction*, Vector<SlowCaseEntry>::iterator&);
 753         void emitSlow_op_new_array(Instruction*, Vector<SlowCaseEntry>::iterator&);
 754
 755         void emitRightShift(Instruction*, bool isUnsigned);
 756         void emitRightShiftSlowCase(Instruction*, Vector<SlowCaseEntry>::iterator&, bool isUnsigned);
 757
 758         /* This function is deprecated. */
 759         void emitGetJITStubArg(unsigned argumentNumber, RegisterID dst);
 760
 761         void emitInitRegister(unsigned dst);
 762
 763         void emitPutToCallFrameHeader(RegisterID from, RegisterFile::CallFrameHeaderEntry entry);
 764         void emitPutCellToCallFrameHeader(RegisterID from, RegisterFile::CallFrameHeaderEntry);
 765         void emitPutIntToCallFrameHeader(RegisterID from, RegisterFile::CallFrameHeaderEntry);
 766         void emitPutImmediateToCallFrameHeader(void* value, RegisterFile::CallFrameHeaderEntry entry);
 767         void emitGetFromCallFrameHeaderPtr(RegisterFile::CallFrameHeaderEntry entry, RegisterID to, RegisterID from = callFrameRegister);
 768         void emitGetFromCallFrameHeader32(RegisterFile::CallFrameHeaderEntry entry, RegisterID to, RegisterID from = callFrameRegister);
 769
 770         JSValue getConstantOperand(unsigned src);
 771         bool isOperandConstantImmediateInt(unsigned src);
 772         bool isOperandConstantImmediateChar(unsigned src);
 773
 774         bool atJumpTarget();
 775
 776         Jump getSlowCase(Vector<SlowCaseEntry>::iterator& iter)
 777         {
 778             return iter++->from;
 779         }
 780         void linkSlowCase(Vector<SlowCaseEntry>::iterator& iter)
 781         {
 782             iter->from.link(this);
 783             ++iter;
 784         }
 785         void linkDummySlowCase(Vector<SlowCaseEntry>::iterator& iter)
 786         {
 787             ASSERT(!iter->from.isSet());
 788             ++iter;
 789         }
 790         void linkSlowCaseIfNotJSCell(Vector<SlowCaseEntry>::iterator&, int virtualRegisterIndex);
 791
 792         Jump checkStructure(RegisterID reg, Structure* structure);
 793
 794         void restoreArgumentReference();
 795         void restoreArgumentReferenceForTrampoline();
 796         void updateTopCallFrame();
 797
 798         Call emitNakedCall(CodePtr function = CodePtr());
 799
 800         void preserveReturnAddressAfterCall(RegisterID);
 801         void restoreReturnAddressBeforeReturn(RegisterID);
 802         void restoreReturnAddressBeforeReturn(Address);
 803
 804         // Loads the character value of a single character string into dst.
 805         void emitLoadCharacterString(RegisterID src, RegisterID dst, JumpList& failures);
 806
 807         enum OptimizationCheckKind { LoopOptimizationCheck, RetOptimizationCheck };
 808 #if ENABLE(DFG_JIT)
 809         void emitOptimizationCheck(OptimizationCheckKind);
 810 #else
 811         void emitOptimizationCheck(OptimizationCheckKind) { }
 812 #endif
 813
 814         void emitTimeoutCheck();
 815 #ifndef NDEBUG
 816         void printBytecodeOperandTypes(unsigned src1, unsigned src2);
 817 #endif
 818
 819 #if ENABLE(SAMPLING_FLAGS)
 820         void setSamplingFlag(int32_t);
 821         void clearSamplingFlag(int32_t);
 822 #endif
 823
 824 #if ENABLE(SAMPLING_COUNTERS)
 825         void emitCount(AbstractSamplingCounter&, int32_t = 1);
 826 #endif
 827
 828 #if ENABLE(OPCODE_SAMPLING)
 829         void sampleInstruction(Instruction*, bool = false);
 830 #endif
 831
 832 #if ENABLE(CODEBLOCK_SAMPLING)
 833         void sampleCodeBlock(CodeBlock*);
 834 #else
 835         void sampleCodeBlock(CodeBlock*) {}
 836 #endif
 837
 838 #if ENABLE(DFG_JIT)
 839         bool canBeOptimized() { return m_canBeOptimized; }
 840         bool shouldEmitProfiling() { return m_canBeOptimized; }
 841 #else
 842         bool canBeOptimized() { return false; }
 843         // Enables use of value profiler with tiered compilation turned off,
 844         // in which case all code gets profiled.
 845         bool shouldEmitProfiling() { return true; }
 846 #endif
 847
 848         Interpreter* m_interpreter;
 849         JSGlobalData* m_globalData;
 850         CodeBlock* m_codeBlock;
 851
 852         Vector<CallRecord> m_calls;
 853         Vector<Label> m_labels;
 854         Vector<PropertyStubCompilationInfo> m_propertyAccessCompilationInfo;
 855         Vector<StructureStubCompilationInfo> m_callStructureStubCompilationInfo;
 856         Vector<MethodCallCompilationInfo> m_methodCallCompilationInfo;
 857         Vector<JumpTable> m_jmpTable;
 858
 859         unsigned m_bytecodeOffset;
 860         Vector<SlowCaseEntry> m_slowCases;
 861         Vector<SwitchRecord> m_switches;
 862
 863         unsigned m_propertyAccessInstructionIndex;
 864         unsigned m_globalResolveInfoIndex;
 865         unsigned m_callLinkInfoIndex;
 866
 867 #if USE(JSVALUE32_64)
 868         unsigned m_jumpTargetIndex;
 869         unsigned m_mappedBytecodeOffset;
 870         int m_mappedVirtualRegisterIndex;
 871         RegisterID m_mappedTag;
 872         RegisterID m_mappedPayload;
 873 #else
 874         int m_lastResultBytecodeRegister;
 875 #endif
 876         unsigned m_jumpTargetsPosition;
 877
 878 #ifndef NDEBUG
 879 #if defined(ASSEMBLER_HAS_CONSTANT_POOL) && ASSEMBLER_HAS_CONSTANT_POOL
 880         Label m_uninterruptedInstructionSequenceBegin;
 881         int m_uninterruptedConstantSequenceBegin;
 882 #endif
 883 #endif
 884         WeakRandom m_randomGenerator;
 885         static CodeRef stringGetByValStubGenerator(JSGlobalData*);
 886
 887 #if ENABLE(VALUE_PROFILER)
 888         bool m_canBeOptimized;
 889 #endif
 890     } JIT_CLASS_ALIGNMENT;
 891
 892     inline void JIT::emit_op_loop(Instruction* currentInstruction)
 893     {
 894         emitTimeoutCheck();
 895         emit_op_jmp(currentInstruction);
 896     }
 897
 898     inline void JIT::emit_op_loop_hint(Instruction*)
 899     {
 900         emitOptimizationCheck(LoopOptimizationCheck);
 901     }
 902
 903     inline void JIT::emit_op_loop_if_true(Instruction* currentInstruction)
 904     {
 905         emitTimeoutCheck();
 906         emit_op_jtrue(currentInstruction);
 907     }
 908
 909     inline void JIT::emitSlow_op_loop_if_true(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 910     {
 911         emitSlow_op_jtrue(currentInstruction, iter);
 912     }
 913
 914     inline void JIT::emit_op_loop_if_false(Instruction* currentInstruction)
 915     {
 916         emitTimeoutCheck();
 917         emit_op_jfalse(currentInstruction);
 918     }
 919
 920     inline void JIT::emitSlow_op_loop_if_false(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 921     {
 922         emitSlow_op_jfalse(currentInstruction, iter);
 923     }
 924
 925     inline void JIT::emit_op_loop_if_less(Instruction* currentInstruction)
 926     {
 927         emitTimeoutCheck();
 928         emit_op_jless(currentInstruction);
 929     }
 930
 931     inline void JIT::emitSlow_op_loop_if_less(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 932     {
 933         emitSlow_op_jless(currentInstruction, iter);
 934     }
 935
 936     inline void JIT::emit_op_loop_if_lesseq(Instruction* currentInstruction)
 937     {
 938         emitTimeoutCheck();
 939         emit_op_jlesseq(currentInstruction);
 940     }
 941
 942     inline void JIT::emitSlow_op_loop_if_lesseq(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 943     {
 944         emitSlow_op_jlesseq(currentInstruction, iter);
 945     }
 946
 947     inline void JIT::emit_op_loop_if_greater(Instruction* currentInstruction)
 948     {
 949         emitTimeoutCheck();
 950         emit_op_jgreater(currentInstruction);
 951     }
 952
 953     inline void JIT::emitSlow_op_loop_if_greater(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 954     {
 955         emitSlow_op_jgreater(currentInstruction, iter);
 956     }
 957
 958     inline void JIT::emit_op_loop_if_greatereq(Instruction* currentInstruction)
 959     {
 960         emitTimeoutCheck();
 961         emit_op_jgreatereq(currentInstruction);
 962     }
 963
 964     inline void JIT::emitSlow_op_loop_if_greatereq(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 965     {
 966         emitSlow_op_jgreatereq(currentInstruction, iter);
 967     }
 968
 969 } // namespace JSC
 970
 971 #endif // ENABLE(JIT)
 972
 973 #endif // JIT_h