jit/JIT.h

   1 /*
   2  * Copyright (C) 2008, 2012, 2013 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 "JITDisassembler.h"
  50 #include "JSInterfaceJIT.h"
  51 #include "LegacyProfiler.h"
  52 #include "Opcode.h"
  53 #include "ResultType.h"
  54 #include "UnusedPointer.h"
  55 #include <bytecode/SamplingTool.h>
  56
  57 namespace JSC {
  58
  59     class CodeBlock;
  60     class FunctionExecutable;
  61     class JIT;
  62     class JSPropertyNameIterator;
  63     class Interpreter;
  64     class JSScope;
  65     class JSStack;
  66     class MarkedAllocator;
  67     class Register;
  68     class StructureChain;
  69
  70     struct CallLinkInfo;
  71     struct Instruction;
  72     struct OperandTypes;
  73     struct PolymorphicAccessStructureList;
  74     struct SimpleJumpTable;
  75     struct StringJumpTable;
  76     struct StructureStubInfo;
  77
  78     struct CallRecord {
  79         MacroAssembler::Call from;
  80         unsigned bytecodeOffset;
  81         void* to;
  82
  83         CallRecord()
  84         {
  85         }
  86
  87         CallRecord(MacroAssembler::Call from, unsigned bytecodeOffset, void* to = 0)
  88             : from(from)
  89             , bytecodeOffset(bytecodeOffset)
  90             , to(to)
  91         {
  92         }
  93     };
  94
  95     struct JumpTable {
  96         MacroAssembler::Jump from;
  97         unsigned toBytecodeOffset;
  98
  99         JumpTable(MacroAssembler::Jump f, unsigned t)
 100             : from(f)
 101             , toBytecodeOffset(t)
 102         {
 103         }
 104     };
 105
 106     struct SlowCaseEntry {
 107         MacroAssembler::Jump from;
 108         unsigned to;
 109         unsigned hint;
 110
 111         SlowCaseEntry(MacroAssembler::Jump f, unsigned t, unsigned h = 0)
 112             : from(f)
 113             , to(t)
 114             , hint(h)
 115         {
 116         }
 117     };
 118
 119     struct SwitchRecord {
 120         enum Type {
 121             Immediate,
 122             Character,
 123             String
 124         };
 125
 126         Type type;
 127
 128         union {
 129             SimpleJumpTable* simpleJumpTable;
 130             StringJumpTable* stringJumpTable;
 131         } jumpTable;
 132
 133         unsigned bytecodeOffset;
 134         unsigned defaultOffset;
 135
 136         SwitchRecord(SimpleJumpTable* jumpTable, unsigned bytecodeOffset, unsigned defaultOffset, Type type)
 137             : type(type)
 138             , bytecodeOffset(bytecodeOffset)
 139             , defaultOffset(defaultOffset)
 140         {
 141             this->jumpTable.simpleJumpTable = jumpTable;
 142         }
 143
 144         SwitchRecord(StringJumpTable* jumpTable, unsigned bytecodeOffset, unsigned defaultOffset)
 145             : type(String)
 146             , bytecodeOffset(bytecodeOffset)
 147             , defaultOffset(defaultOffset)
 148         {
 149             this->jumpTable.stringJumpTable = jumpTable;
 150         }
 151     };
 152
 153     enum PropertyStubGetById_T { PropertyStubGetById };
 154     enum PropertyStubPutById_T { PropertyStubPutById };
 155
 156     struct PropertyStubCompilationInfo {
 157         enum Type { GetById, PutById } m_type;
 158
 159         unsigned bytecodeIndex;
 160         MacroAssembler::Call callReturnLocation;
 161         MacroAssembler::Label hotPathBegin;
 162         MacroAssembler::DataLabelPtr getStructureToCompare;
 163         MacroAssembler::PatchableJump getStructureCheck;
 164         MacroAssembler::ConvertibleLoadLabel propertyStorageLoad;
 165 #if USE(JSVALUE64)
 166         MacroAssembler::DataLabelCompact getDisplacementLabel;
 167 #else
 168         MacroAssembler::DataLabelCompact getDisplacementLabel1;
 169         MacroAssembler::DataLabelCompact getDisplacementLabel2;
 170 #endif
 171         MacroAssembler::Label getPutResult;
 172         MacroAssembler::Label getColdPathBegin;
 173         MacroAssembler::DataLabelPtr putStructureToCompare;
 174 #if USE(JSVALUE64)
 175         MacroAssembler::DataLabel32 putDisplacementLabel;
 176 #else
 177         MacroAssembler::DataLabel32 putDisplacementLabel1;
 178         MacroAssembler::DataLabel32 putDisplacementLabel2;
 179 #endif
 180
 181 #if !ASSERT_DISABLED
 182         PropertyStubCompilationInfo()
 183             : bytecodeIndex(std::numeric_limits<unsigned>::max())
 184         {
 185         }
 186 #endif
 187
 188
 189         PropertyStubCompilationInfo(
 190             PropertyStubGetById_T, unsigned bytecodeIndex, MacroAssembler::Label hotPathBegin,
 191             MacroAssembler::DataLabelPtr structureToCompare,
 192             MacroAssembler::PatchableJump structureCheck,
 193             MacroAssembler::ConvertibleLoadLabel propertyStorageLoad,
 194 #if USE(JSVALUE64)
 195             MacroAssembler::DataLabelCompact displacementLabel,
 196 #else
 197             MacroAssembler::DataLabelCompact displacementLabel1,
 198             MacroAssembler::DataLabelCompact displacementLabel2,
 199 #endif
 200             MacroAssembler::Label putResult)
 201             : m_type(GetById)
 202             , bytecodeIndex(bytecodeIndex)
 203             , hotPathBegin(hotPathBegin)
 204             , getStructureToCompare(structureToCompare)
 205             , getStructureCheck(structureCheck)
 206             , propertyStorageLoad(propertyStorageLoad)
 207 #if USE(JSVALUE64)
 208             , getDisplacementLabel(displacementLabel)
 209 #else
 210             , getDisplacementLabel1(displacementLabel1)
 211             , getDisplacementLabel2(displacementLabel2)
 212 #endif
 213             , getPutResult(putResult)
 214         {
 215         }
 216
 217         PropertyStubCompilationInfo(
 218             PropertyStubPutById_T, unsigned bytecodeIndex, MacroAssembler::Label hotPathBegin,
 219             MacroAssembler::DataLabelPtr structureToCompare,
 220             MacroAssembler::ConvertibleLoadLabel propertyStorageLoad,
 221 #if USE(JSVALUE64)
 222             MacroAssembler::DataLabel32 displacementLabel
 223 #else
 224             MacroAssembler::DataLabel32 displacementLabel1,
 225             MacroAssembler::DataLabel32 displacementLabel2
 226 #endif
 227             )
 228             : m_type(PutById)
 229             , bytecodeIndex(bytecodeIndex)
 230             , hotPathBegin(hotPathBegin)
 231             , propertyStorageLoad(propertyStorageLoad)
 232             , putStructureToCompare(structureToCompare)
 233 #if USE(JSVALUE64)
 234             , putDisplacementLabel(displacementLabel)
 235 #else
 236             , putDisplacementLabel1(displacementLabel1)
 237             , putDisplacementLabel2(displacementLabel2)
 238 #endif
 239         {
 240         }
 241
 242         void slowCaseInfo(PropertyStubGetById_T, MacroAssembler::Label coldPathBegin, MacroAssembler::Call call)
 243         {
 244             ASSERT(m_type == GetById);
 245             callReturnLocation = call;
 246             getColdPathBegin = coldPathBegin;
 247         }
 248
 249         void slowCaseInfo(PropertyStubPutById_T, MacroAssembler::Call call)
 250         {
 251             ASSERT(m_type == PutById);
 252             callReturnLocation = call;
 253         }
 254
 255         void copyToStubInfo(StructureStubInfo& info, LinkBuffer &patchBuffer);
 256     };
 257
 258     struct ByValCompilationInfo {
 259         ByValCompilationInfo() { }
 260
 261         ByValCompilationInfo(unsigned bytecodeIndex, MacroAssembler::PatchableJump badTypeJump, JITArrayMode arrayMode, MacroAssembler::Label doneTarget)
 262             : bytecodeIndex(bytecodeIndex)
 263             , badTypeJump(badTypeJump)
 264             , arrayMode(arrayMode)
 265             , doneTarget(doneTarget)
 266         {
 267         }
 268
 269         unsigned bytecodeIndex;
 270         MacroAssembler::PatchableJump badTypeJump;
 271         JITArrayMode arrayMode;
 272         MacroAssembler::Label doneTarget;
 273         MacroAssembler::Label slowPathTarget;
 274         MacroAssembler::Call returnAddress;
 275     };
 276
 277     struct StructureStubCompilationInfo {
 278         MacroAssembler::DataLabelPtr hotPathBegin;
 279         MacroAssembler::Call hotPathOther;
 280         MacroAssembler::Call callReturnLocation;
 281         CallLinkInfo::CallType callType;
 282         unsigned bytecodeIndex;
 283     };
 284
 285     // Near calls can only be patched to other JIT code, regular calls can be patched to JIT code or relinked to stub functions.
 286     void ctiPatchNearCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, MacroAssemblerCodePtr newCalleeFunction);
 287     void ctiPatchCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, MacroAssemblerCodePtr newCalleeFunction);
 288     void ctiPatchCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, FunctionPtr newCalleeFunction);
 289
 290     class JIT : private JSInterfaceJIT {
 291         friend class JITStubCall;
 292         friend struct PropertyStubCompilationInfo;
 293
 294         using MacroAssembler::Jump;
 295         using MacroAssembler::JumpList;
 296         using MacroAssembler::Label;
 297
 298         static const uintptr_t patchGetByIdDefaultStructure = unusedPointer;
 299         static const int patchGetByIdDefaultOffset = 0;
 300         // Magic number - initial offset cannot be representable as a signed 8bit value, or the X86Assembler
 301         // will compress the displacement, and we may not be able to fit a patched offset.
 302         static const int patchPutByIdDefaultOffset = 256;
 303
 304     public:
 305         static JITCode compile(VM* vm, CodeBlock* codeBlock, JITCompilationEffort effort, CodePtr* functionEntryArityCheck = 0)
 306         {
 307             return JIT(vm, codeBlock).privateCompile(functionEntryArityCheck, effort);
 308         }
 309
 310         static void compileClosureCall(VM* vm, CallLinkInfo* callLinkInfo, CodeBlock* callerCodeBlock, CodeBlock* calleeCodeBlock, Structure* expectedStructure, ExecutableBase* expectedExecutable, MacroAssemblerCodePtr codePtr)
 311         {
 312             JIT jit(vm, callerCodeBlock);
 313             jit.m_bytecodeOffset = callLinkInfo->codeOrigin.bytecodeIndex;
 314             jit.privateCompileClosureCall(callLinkInfo, calleeCodeBlock, expectedStructure, expectedExecutable, codePtr);
 315         }
 316
 317         static void compileGetByIdProto(VM* vm, CallFrame* callFrame, CodeBlock* codeBlock, StructureStubInfo* stubInfo, Structure* structure, Structure* prototypeStructure, const Identifier& ident, const PropertySlot& slot, PropertyOffset cachedOffset, ReturnAddressPtr returnAddress)
 318         {
 319             JIT jit(vm, codeBlock);
 320             jit.m_bytecodeOffset = stubInfo->bytecodeIndex;
 321             jit.privateCompileGetByIdProto(stubInfo, structure, prototypeStructure, ident, slot, cachedOffset, returnAddress, callFrame);
 322         }
 323
 324         static void compileGetByIdSelfList(VM* vm, CodeBlock* codeBlock, StructureStubInfo* stubInfo, PolymorphicAccessStructureList* polymorphicStructures, int currentIndex, Structure* structure, const Identifier& ident, const PropertySlot& slot, PropertyOffset cachedOffset)
 325         {
 326             JIT jit(vm, codeBlock);
 327             jit.m_bytecodeOffset = stubInfo->bytecodeIndex;
 328             jit.privateCompileGetByIdSelfList(stubInfo, polymorphicStructures, currentIndex, structure, ident, slot, cachedOffset);
 329         }
 330         static void compileGetByIdProtoList(VM* vm, CallFrame* callFrame, CodeBlock* codeBlock, StructureStubInfo* stubInfo, PolymorphicAccessStructureList* prototypeStructureList, int currentIndex, Structure* structure, Structure* prototypeStructure, const Identifier& ident, const PropertySlot& slot, PropertyOffset cachedOffset)
 331         {
 332             JIT jit(vm, codeBlock);
 333             jit.m_bytecodeOffset = stubInfo->bytecodeIndex;
 334             jit.privateCompileGetByIdProtoList(stubInfo, prototypeStructureList, currentIndex, structure, prototypeStructure, ident, slot, cachedOffset, callFrame);
 335         }
 336         static void compileGetByIdChainList(VM* vm, CallFrame* callFrame, CodeBlock* codeBlock, StructureStubInfo* stubInfo, PolymorphicAccessStructureList* prototypeStructureList, int currentIndex, Structure* structure, StructureChain* chain, size_t count, const Identifier& ident, const PropertySlot& slot, PropertyOffset cachedOffset)
 337         {
 338             JIT jit(vm, codeBlock);
 339             jit.m_bytecodeOffset = stubInfo->bytecodeIndex;
 340             jit.privateCompileGetByIdChainList(stubInfo, prototypeStructureList, currentIndex, structure, chain, count, ident, slot, cachedOffset, callFrame);
 341         }
 342
 343         static void compileGetByIdChain(VM* vm, CallFrame* callFrame, CodeBlock* codeBlock, StructureStubInfo* stubInfo, Structure* structure, StructureChain* chain, size_t count, const Identifier& ident, const PropertySlot& slot, PropertyOffset cachedOffset, ReturnAddressPtr returnAddress)
 344         {
 345             JIT jit(vm, codeBlock);
 346             jit.m_bytecodeOffset = stubInfo->bytecodeIndex;
 347             jit.privateCompileGetByIdChain(stubInfo, structure, chain, count, ident, slot, cachedOffset, returnAddress, callFrame);
 348         }
 349
 350         static void compilePutByIdTransition(VM* vm, CodeBlock* codeBlock, StructureStubInfo* stubInfo, Structure* oldStructure, Structure* newStructure, PropertyOffset cachedOffset, StructureChain* chain, ReturnAddressPtr returnAddress, bool direct)
 351         {
 352             JIT jit(vm, codeBlock);
 353             jit.m_bytecodeOffset = stubInfo->bytecodeIndex;
 354             jit.privateCompilePutByIdTransition(stubInfo, oldStructure, newStructure, cachedOffset, chain, returnAddress, direct);
 355         }
 356
 357         static void compileGetByVal(VM* vm, CodeBlock* codeBlock, ByValInfo* byValInfo, ReturnAddressPtr returnAddress, JITArrayMode arrayMode)
 358         {
 359             JIT jit(vm, codeBlock);
 360             jit.m_bytecodeOffset = byValInfo->bytecodeIndex;
 361             jit.privateCompileGetByVal(byValInfo, returnAddress, arrayMode);
 362         }
 363
 364         static void compilePutByVal(VM* vm, CodeBlock* codeBlock, ByValInfo* byValInfo, ReturnAddressPtr returnAddress, JITArrayMode arrayMode)
 365         {
 366             JIT jit(vm, codeBlock);
 367             jit.m_bytecodeOffset = byValInfo->bytecodeIndex;
 368             jit.privateCompilePutByVal(byValInfo, returnAddress, arrayMode);
 369         }
 370
 371         static CodeRef compileCTINativeCall(VM* vm, NativeFunction func)
 372         {
 373             if (!vm->canUseJIT()) {
 374 #if ENABLE(LLINT)
 375                 return CodeRef::createLLIntCodeRef(llint_native_call_trampoline);
 376 #else
 377                 return CodeRef();
 378 #endif
 379             }
 380             JIT jit(vm, 0);
 381             return jit.privateCompileCTINativeCall(vm, func);
 382         }
 383
 384         static void resetPatchGetById(RepatchBuffer&, StructureStubInfo*);
 385         static void resetPatchPutById(RepatchBuffer&, StructureStubInfo*);
 386         static void patchGetByIdSelf(CodeBlock*, StructureStubInfo*, Structure*, PropertyOffset cachedOffset, ReturnAddressPtr);
 387         static void patchPutByIdReplace(CodeBlock*, StructureStubInfo*, Structure*, PropertyOffset cachedOffset, ReturnAddressPtr, bool direct);
 388
 389         static void compilePatchGetArrayLength(VM* vm, CodeBlock* codeBlock, ReturnAddressPtr returnAddress)
 390         {
 391             JIT jit(vm, codeBlock);
 392 #if ENABLE(DFG_JIT)
 393             // Force profiling to be enabled during stub generation.
 394             jit.m_canBeOptimized = true;
 395             jit.m_canBeOptimizedOrInlined = true;
 396             jit.m_shouldEmitProfiling = true;
 397 #endif // ENABLE(DFG_JIT)
 398             return jit.privateCompilePatchGetArrayLength(returnAddress);
 399         }
 400
 401         static void linkFor(JSFunction* callee, CodeBlock* callerCodeBlock, CodeBlock* calleeCodeBlock, CodePtr, CallLinkInfo*, VM*, CodeSpecializationKind);
 402         static void linkSlowCall(CodeBlock* callerCodeBlock, CallLinkInfo*);
 403
 404     private:
 405         JIT(VM*, CodeBlock* = 0);
 406
 407         void privateCompileMainPass();
 408         void privateCompileLinkPass();
 409         void privateCompileSlowCases();
 410         JITCode privateCompile(CodePtr* functionEntryArityCheck, JITCompilationEffort);
 411
 412         void privateCompileClosureCall(CallLinkInfo*, CodeBlock* calleeCodeBlock, Structure*, ExecutableBase*, MacroAssemblerCodePtr);
 413
 414         void privateCompileGetByIdProto(StructureStubInfo*, Structure*, Structure* prototypeStructure, const Identifier&, const PropertySlot&, PropertyOffset cachedOffset, ReturnAddressPtr, CallFrame*);
 415         void privateCompileGetByIdSelfList(StructureStubInfo*, PolymorphicAccessStructureList*, int, Structure*, const Identifier&, const PropertySlot&, PropertyOffset cachedOffset);
 416         void privateCompileGetByIdProtoList(StructureStubInfo*, PolymorphicAccessStructureList*, int, Structure*, Structure* prototypeStructure, const Identifier&, const PropertySlot&, PropertyOffset cachedOffset, CallFrame*);
 417         void privateCompileGetByIdChainList(StructureStubInfo*, PolymorphicAccessStructureList*, int, Structure*, StructureChain*, size_t count, const Identifier&, const PropertySlot&, PropertyOffset cachedOffset, CallFrame*);
 418         void privateCompileGetByIdChain(StructureStubInfo*, Structure*, StructureChain*, size_t count, const Identifier&, const PropertySlot&, PropertyOffset cachedOffset, ReturnAddressPtr, CallFrame*);
 419         void privateCompilePutByIdTransition(StructureStubInfo*, Structure*, Structure*, PropertyOffset cachedOffset, StructureChain*, ReturnAddressPtr, bool direct);
 420
 421         void privateCompileGetByVal(ByValInfo*, ReturnAddressPtr, JITArrayMode);
 422         void privateCompilePutByVal(ByValInfo*, ReturnAddressPtr, JITArrayMode);
 423
 424         Label privateCompileCTINativeCall(VM*, bool isConstruct = false);
 425         CodeRef privateCompileCTINativeCall(VM*, NativeFunction);
 426         void privateCompilePatchGetArrayLength(ReturnAddressPtr returnAddress);
 427
 428         static bool isDirectPutById(StructureStubInfo*);
 429
 430         void addSlowCase(Jump);
 431         void addSlowCase(JumpList);
 432         void addSlowCase();
 433         void addJump(Jump, int);
 434         void emitJumpSlowToHot(Jump, int);
 435
 436         void compileOpCall(OpcodeID, Instruction*, unsigned callLinkInfoIndex);
 437         void compileOpCallSlowCase(OpcodeID, Instruction*, Vector<SlowCaseEntry>::iterator&, unsigned callLinkInfoIndex);
 438         void compileLoadVarargs(Instruction*);
 439         void compileCallEval();
 440         void compileCallEvalSlowCase(Vector<SlowCaseEntry>::iterator&);
 441
 442         enum CompileOpStrictEqType { OpStrictEq, OpNStrictEq };
 443         void compileOpStrictEq(Instruction* instruction, CompileOpStrictEqType type);
 444         bool isOperandConstantImmediateDouble(unsigned src);
 445
 446         void emitLoadDouble(int index, FPRegisterID value);
 447         void emitLoadInt32ToDouble(int index, FPRegisterID value);
 448         Jump emitJumpIfNotObject(RegisterID structureReg);
 449
 450         Jump addStructureTransitionCheck(JSCell*, Structure*, StructureStubInfo*, RegisterID scratch);
 451         void addStructureTransitionCheck(JSCell*, Structure*, StructureStubInfo*, JumpList& failureCases, RegisterID scratch);
 452         void testPrototype(JSValue, JumpList& failureCases, StructureStubInfo*);
 453
 454         enum WriteBarrierMode { UnconditionalWriteBarrier, ShouldFilterImmediates };
 455         // value register in write barrier is used before any scratch registers
 456         // so may safely be the same as either of the scratch registers.
 457         void emitWriteBarrier(RegisterID owner, RegisterID valueTag, RegisterID scratch, RegisterID scratch2, WriteBarrierMode, WriteBarrierUseKind);
 458         void emitWriteBarrier(JSCell* owner, RegisterID value, RegisterID scratch, WriteBarrierMode, WriteBarrierUseKind);
 459
 460         template<typename StructureType> // StructureType can be RegisterID or ImmPtr.
 461         void emitAllocateJSObject(RegisterID allocator, StructureType, RegisterID result, RegisterID scratch);
 462
 463 #if ENABLE(VALUE_PROFILER)
 464         // This assumes that the value to profile is in regT0 and that regT3 is available for
 465         // scratch.
 466         void emitValueProfilingSite(ValueProfile*);
 467         void emitValueProfilingSite(unsigned bytecodeOffset);
 468         void emitValueProfilingSite();
 469 #else
 470         void emitValueProfilingSite(unsigned) { }
 471         void emitValueProfilingSite() { }
 472 #endif
 473         void emitArrayProfilingSite(RegisterID structureAndIndexingType, RegisterID scratch, ArrayProfile*);
 474         void emitArrayProfilingSiteForBytecodeIndex(RegisterID structureAndIndexingType, RegisterID scratch, unsigned bytecodeIndex);
 475         void emitArrayProfileStoreToHoleSpecialCase(ArrayProfile*);
 476         void emitArrayProfileOutOfBoundsSpecialCase(ArrayProfile*);
 477
 478         JITArrayMode chooseArrayMode(ArrayProfile*);
 479
 480         // Property is in regT1, base is in regT0. regT2 contains indexing type.
 481         // Property is int-checked and zero extended. Base is cell checked.
 482         // Structure is already profiled. Returns the slow cases. Fall-through
 483         // case contains result in regT0, and it is not yet profiled.
 484         JumpList emitInt32GetByVal(Instruction* instruction, PatchableJump& badType) { return emitContiguousGetByVal(instruction, badType, Int32Shape); }
 485         JumpList emitDoubleGetByVal(Instruction*, PatchableJump& badType);
 486         JumpList emitContiguousGetByVal(Instruction*, PatchableJump& badType, IndexingType expectedShape = ContiguousShape);
 487         JumpList emitArrayStorageGetByVal(Instruction*, PatchableJump& badType);
 488         JumpList emitIntTypedArrayGetByVal(Instruction*, PatchableJump& badType, const TypedArrayDescriptor&, size_t elementSize, TypedArraySignedness);
 489         JumpList emitFloatTypedArrayGetByVal(Instruction*, PatchableJump& badType, const TypedArrayDescriptor&, size_t elementSize);
 490
 491         // Property is in regT0, base is in regT0. regT2 contains indecing type.
 492         // The value to store is not yet loaded. Property is int-checked and
 493         // zero-extended. Base is cell checked. Structure is already profiled.
 494         // returns the slow cases.
 495         JumpList emitInt32PutByVal(Instruction* currentInstruction, PatchableJump& badType)
 496         {
 497             return emitGenericContiguousPutByVal(currentInstruction, badType, Int32Shape);
 498         }
 499         JumpList emitDoublePutByVal(Instruction* currentInstruction, PatchableJump& badType)
 500         {
 501             return emitGenericContiguousPutByVal(currentInstruction, badType, DoubleShape);
 502         }
 503         JumpList emitContiguousPutByVal(Instruction* currentInstruction, PatchableJump& badType)
 504         {
 505             return emitGenericContiguousPutByVal(currentInstruction, badType);
 506         }
 507         JumpList emitGenericContiguousPutByVal(Instruction*, PatchableJump& badType, IndexingType indexingShape = ContiguousShape);
 508         JumpList emitArrayStoragePutByVal(Instruction*, PatchableJump& badType);
 509         JumpList emitIntTypedArrayPutByVal(Instruction*, PatchableJump& badType, const TypedArrayDescriptor&, size_t elementSize, TypedArraySignedness, TypedArrayRounding);
 510         JumpList emitFloatTypedArrayPutByVal(Instruction*, PatchableJump& badType, const TypedArrayDescriptor&, size_t elementSize);
 511
 512         enum FinalObjectMode { MayBeFinal, KnownNotFinal };
 513
 514 #if USE(JSVALUE32_64)
 515         bool getOperandConstantImmediateInt(unsigned op1, unsigned op2, unsigned& op, int32_t& constant);
 516
 517         void emitLoadTag(int index, RegisterID tag);
 518         void emitLoadPayload(int index, RegisterID payload);
 519
 520         void emitLoad(const JSValue& v, RegisterID tag, RegisterID payload);
 521         void emitLoad(int index, RegisterID tag, RegisterID payload, RegisterID base = callFrameRegister);
 522         void emitLoad2(int index1, RegisterID tag1, RegisterID payload1, int index2, RegisterID tag2, RegisterID payload2);
 523
 524         void emitStore(int index, RegisterID tag, RegisterID payload, RegisterID base = callFrameRegister);
 525         void emitStore(int index, const JSValue constant, RegisterID base = callFrameRegister);
 526         void emitStoreInt32(int index, RegisterID payload, bool indexIsInt32 = false);
 527         void emitStoreInt32(int index, TrustedImm32 payload, bool indexIsInt32 = false);
 528         void emitStoreAndMapInt32(int index, RegisterID tag, RegisterID payload, bool indexIsInt32, size_t opcodeLength);
 529         void emitStoreCell(int index, RegisterID payload, bool indexIsCell = false);
 530         void emitStoreBool(int index, RegisterID payload, bool indexIsBool = false);
 531         void emitStoreDouble(int index, FPRegisterID value);
 532
 533         bool isLabeled(unsigned bytecodeOffset);
 534         void map(unsigned bytecodeOffset, int virtualRegisterIndex, RegisterID tag, RegisterID payload);
 535         void unmap(RegisterID);
 536         void unmap();
 537         bool isMapped(int virtualRegisterIndex);
 538         bool getMappedPayload(int virtualRegisterIndex, RegisterID& payload);
 539         bool getMappedTag(int virtualRegisterIndex, RegisterID& tag);
 540
 541         void emitJumpSlowCaseIfNotJSCell(int virtualRegisterIndex);
 542         void emitJumpSlowCaseIfNotJSCell(int virtualRegisterIndex, RegisterID tag);
 543
 544         void compileGetByIdHotPath(Identifier*);
 545         void compileGetByIdSlowCase(int resultVReg, int baseVReg, Identifier*, Vector<SlowCaseEntry>::iterator&);
 546         void compileGetDirectOffset(RegisterID base, RegisterID resultTag, RegisterID resultPayload, PropertyOffset cachedOffset);
 547         void compileGetDirectOffset(JSObject* base, RegisterID resultTag, RegisterID resultPayload, PropertyOffset cachedOffset);
 548         void compileGetDirectOffset(RegisterID base, RegisterID resultTag, RegisterID resultPayload, RegisterID offset, FinalObjectMode = MayBeFinal);
 549         void compilePutDirectOffset(RegisterID base, RegisterID valueTag, RegisterID valuePayload, PropertyOffset cachedOffset);
 550
 551         // Arithmetic opcode helpers
 552         void emitAdd32Constant(unsigned dst, unsigned op, int32_t constant, ResultType opType);
 553         void emitSub32Constant(unsigned dst, unsigned op, int32_t constant, ResultType opType);
 554         void emitBinaryDoubleOp(OpcodeID, unsigned dst, unsigned op1, unsigned op2, OperandTypes, JumpList& notInt32Op1, JumpList& notInt32Op2, bool op1IsInRegisters = true, bool op2IsInRegisters = true);
 555
 556 #if CPU(ARM_TRADITIONAL)
 557         // sequenceOpCall
 558         static const int sequenceOpCallInstructionSpace = 12;
 559         static const int sequenceOpCallConstantSpace = 2;
 560         // sequenceGetByIdHotPath
 561         static const int sequenceGetByIdHotPathInstructionSpace = 36;
 562         static const int sequenceGetByIdHotPathConstantSpace = 4;
 563         // sequenceGetByIdSlowCase
 564         static const int sequenceGetByIdSlowCaseInstructionSpace = 80;
 565         static const int sequenceGetByIdSlowCaseConstantSpace = 4;
 566         // sequencePutById
 567         static const int sequencePutByIdInstructionSpace = 36;
 568         static const int sequencePutByIdConstantSpace = 4;
 569 #elif CPU(SH4)
 570         // sequenceOpCall
 571         static const int sequenceOpCallInstructionSpace = 12;
 572         static const int sequenceOpCallConstantSpace = 2;
 573         // sequenceGetByIdHotPath
 574         static const int sequenceGetByIdHotPathInstructionSpace = 36;
 575         static const int sequenceGetByIdHotPathConstantSpace = 5;
 576         // sequenceGetByIdSlowCase
 577         static const int sequenceGetByIdSlowCaseInstructionSpace = 38;
 578         static const int sequenceGetByIdSlowCaseConstantSpace = 4;
 579         // sequencePutById
 580         static const int sequencePutByIdInstructionSpace = 36;
 581         static const int sequencePutByIdConstantSpace = 5;
 582 #endif
 583
 584 #else // USE(JSVALUE32_64)
 585         /* This function is deprecated. */
 586         void emitGetJITStubArg(unsigned argumentNumber, RegisterID dst);
 587
 588         void emitGetVirtualRegister(int src, RegisterID dst);
 589         void emitGetVirtualRegisters(int src1, RegisterID dst1, int src2, RegisterID dst2);
 590         void emitPutVirtualRegister(unsigned dst, RegisterID from = regT0);
 591         void emitStoreCell(unsigned dst, RegisterID payload, bool /* only used in JSValue32_64 */ = false)
 592         {
 593             emitPutVirtualRegister(dst, payload);
 594         }
 595
 596         int32_t getConstantOperandImmediateInt(unsigned src);
 597
 598         void killLastResultRegister();
 599
 600         Jump emitJumpIfJSCell(RegisterID);
 601         Jump emitJumpIfBothJSCells(RegisterID, RegisterID, RegisterID);
 602         void emitJumpSlowCaseIfJSCell(RegisterID);
 603         void emitJumpSlowCaseIfNotJSCell(RegisterID);
 604         void emitJumpSlowCaseIfNotJSCell(RegisterID, int VReg);
 605         Jump emitJumpIfImmediateInteger(RegisterID);
 606         Jump emitJumpIfNotImmediateInteger(RegisterID);
 607         Jump emitJumpIfNotImmediateIntegers(RegisterID, RegisterID, RegisterID);
 608         void emitJumpSlowCaseIfNotImmediateInteger(RegisterID);
 609         void emitJumpSlowCaseIfNotImmediateNumber(RegisterID);
 610         void emitJumpSlowCaseIfNotImmediateIntegers(RegisterID, RegisterID, RegisterID);
 611
 612         void emitFastArithReTagImmediate(RegisterID src, RegisterID dest);
 613
 614         void emitTagAsBoolImmediate(RegisterID reg);
 615         void compileBinaryArithOp(OpcodeID, unsigned dst, unsigned src1, unsigned src2, OperandTypes opi);
 616         void compileBinaryArithOpSlowCase(OpcodeID, Vector<SlowCaseEntry>::iterator&, unsigned dst, unsigned src1, unsigned src2, OperandTypes, bool op1HasImmediateIntFastCase, bool op2HasImmediateIntFastCase);
 617
 618         void compileGetByIdHotPath(int baseVReg, Identifier*);
 619         void compileGetByIdSlowCase(int resultVReg, int baseVReg, Identifier*, Vector<SlowCaseEntry>::iterator&);
 620         void compileGetDirectOffset(RegisterID base, RegisterID result, PropertyOffset cachedOffset);
 621         void compileGetDirectOffset(JSObject* base, RegisterID result, PropertyOffset cachedOffset);
 622         void compileGetDirectOffset(RegisterID base, RegisterID result, RegisterID offset, RegisterID scratch, FinalObjectMode = MayBeFinal);
 623         void compilePutDirectOffset(RegisterID base, RegisterID value, PropertyOffset cachedOffset);
 624
 625 #endif // USE(JSVALUE32_64)
 626
 627 #if (defined(ASSEMBLER_HAS_CONSTANT_POOL) && ASSEMBLER_HAS_CONSTANT_POOL)
 628 #define BEGIN_UNINTERRUPTED_SEQUENCE(name) do { beginUninterruptedSequence(name ## InstructionSpace, name ## ConstantSpace); } while (false)
 629 #define END_UNINTERRUPTED_SEQUENCE_FOR_PUT(name, dst) do { endUninterruptedSequence(name ## InstructionSpace, name ## ConstantSpace, dst); } while (false)
 630 #define END_UNINTERRUPTED_SEQUENCE(name) END_UNINTERRUPTED_SEQUENCE_FOR_PUT(name, 0)
 631
 632         void beginUninterruptedSequence(int, int);
 633         void endUninterruptedSequence(int, int, int);
 634
 635 #else
 636 #define BEGIN_UNINTERRUPTED_SEQUENCE(name)
 637 #define END_UNINTERRUPTED_SEQUENCE(name)
 638 #define END_UNINTERRUPTED_SEQUENCE_FOR_PUT(name, dst)
 639 #endif
 640
 641         void emit_compareAndJump(OpcodeID, unsigned op1, unsigned op2, unsigned target, RelationalCondition);
 642         void emit_compareAndJumpSlow(unsigned op1, unsigned op2, unsigned target, DoubleCondition, int (JIT_STUB *stub)(STUB_ARGS_DECLARATION), bool invert, Vector<SlowCaseEntry>::iterator&);
 643
 644         void emit_op_add(Instruction*);
 645         void emit_op_bitand(Instruction*);
 646         void emit_op_bitor(Instruction*);
 647         void emit_op_bitxor(Instruction*);
 648         void emit_op_call(Instruction*);
 649         void emit_op_call_eval(Instruction*);
 650         void emit_op_call_varargs(Instruction*);
 651         void emit_op_call_put_result(Instruction*);
 652         void emit_op_catch(Instruction*);
 653         void emit_op_construct(Instruction*);
 654         void emit_op_get_callee(Instruction*);
 655         void emit_op_create_this(Instruction*);
 656         void emit_op_convert_this(Instruction*);
 657         void emit_op_create_arguments(Instruction*);
 658         void emit_op_debug(Instruction*);
 659         void emit_op_del_by_id(Instruction*);
 660         void emit_op_div(Instruction*);
 661         void emit_op_end(Instruction*);
 662         void emit_op_enter(Instruction*);
 663         void emit_op_create_activation(Instruction*);
 664         void emit_op_eq(Instruction*);
 665         void emit_op_eq_null(Instruction*);
 666         void emit_op_get_by_id(Instruction*);
 667         void emit_op_get_arguments_length(Instruction*);
 668         void emit_op_get_by_val(Instruction*);
 669         void emit_op_get_argument_by_val(Instruction*);
 670         void emit_op_get_by_pname(Instruction*);
 671         void emit_op_init_lazy_reg(Instruction*);
 672         void emit_op_check_has_instance(Instruction*);
 673         void emit_op_instanceof(Instruction*);
 674         void emit_op_is_undefined(Instruction*);
 675         void emit_op_is_boolean(Instruction*);
 676         void emit_op_is_number(Instruction*);
 677         void emit_op_is_string(Instruction*);
 678         void emit_op_jeq_null(Instruction*);
 679         void emit_op_jfalse(Instruction*);
 680         void emit_op_jmp(Instruction*);
 681         void emit_op_jneq_null(Instruction*);
 682         void emit_op_jneq_ptr(Instruction*);
 683         void emit_op_jless(Instruction*);
 684         void emit_op_jlesseq(Instruction*);
 685         void emit_op_jgreater(Instruction*);
 686         void emit_op_jgreatereq(Instruction*);
 687         void emit_op_jnless(Instruction*);
 688         void emit_op_jnlesseq(Instruction*);
 689         void emit_op_jngreater(Instruction*);
 690         void emit_op_jngreatereq(Instruction*);
 691         void emit_op_jtrue(Instruction*);
 692         void emit_op_loop_hint(Instruction*);
 693         void emit_op_lshift(Instruction*);
 694         void emit_op_mod(Instruction*);
 695         void emit_op_mov(Instruction*);
 696         void emit_op_mul(Instruction*);
 697         void emit_op_negate(Instruction*);
 698         void emit_op_neq(Instruction*);
 699         void emit_op_neq_null(Instruction*);
 700         void emit_op_new_array(Instruction*);
 701         void emit_op_new_array_with_size(Instruction*);
 702         void emit_op_new_array_buffer(Instruction*);
 703         void emit_op_new_func(Instruction*);
 704         void emit_op_new_func_exp(Instruction*);
 705         void emit_op_new_object(Instruction*);
 706         void emit_op_new_regexp(Instruction*);
 707         void emit_op_get_pnames(Instruction*);
 708         void emit_op_next_pname(Instruction*);
 709         void emit_op_not(Instruction*);
 710         void emit_op_nstricteq(Instruction*);
 711         void emit_op_pop_scope(Instruction*);
 712         void emit_op_dec(Instruction*);
 713         void emit_op_inc(Instruction*);
 714         void emit_op_profile_did_call(Instruction*);
 715         void emit_op_profile_will_call(Instruction*);
 716         void emit_op_push_name_scope(Instruction*);
 717         void emit_op_push_with_scope(Instruction*);
 718         void emit_op_put_by_id(Instruction*);
 719         void emit_op_put_by_index(Instruction*);
 720         void emit_op_put_by_val(Instruction*);
 721         void emit_op_put_getter_setter(Instruction*);
 722         void emit_op_init_global_const(Instruction*);
 723         void emit_op_init_global_const_check(Instruction*);
 724         void emit_resolve_operations(ResolveOperations*, const int* base, const int* value);
 725         void emitSlow_link_resolve_operations(ResolveOperations*, Vector<SlowCaseEntry>::iterator&);
 726         void emit_op_resolve(Instruction*);
 727         void emit_op_resolve_base(Instruction*);
 728         void emit_op_resolve_with_base(Instruction*);
 729         void emit_op_resolve_with_this(Instruction*);
 730         void emit_op_put_to_base(Instruction*);
 731         void emit_op_ret(Instruction*);
 732         void emit_op_ret_object_or_this(Instruction*);
 733         void emit_op_rshift(Instruction*);
 734         void emit_op_strcat(Instruction*);
 735         void emit_op_stricteq(Instruction*);
 736         void emit_op_sub(Instruction*);
 737         void emit_op_switch_char(Instruction*);
 738         void emit_op_switch_imm(Instruction*);
 739         void emit_op_switch_string(Instruction*);
 740         void emit_op_tear_off_activation(Instruction*);
 741         void emit_op_tear_off_arguments(Instruction*);
 742         void emit_op_throw(Instruction*);
 743         void emit_op_throw_static_error(Instruction*);
 744         void emit_op_to_number(Instruction*);
 745         void emit_op_to_primitive(Instruction*);
 746         void emit_op_unexpected_load(Instruction*);
 747         void emit_op_urshift(Instruction*);
 748         void emit_op_get_scoped_var(Instruction*);
 749         void emit_op_put_scoped_var(Instruction*);
 750
 751         void emitSlow_op_add(Instruction*, Vector<SlowCaseEntry>::iterator&);
 752         void emitSlow_op_bitand(Instruction*, Vector<SlowCaseEntry>::iterator&);
 753         void emitSlow_op_bitor(Instruction*, Vector<SlowCaseEntry>::iterator&);
 754         void emitSlow_op_bitxor(Instruction*, Vector<SlowCaseEntry>::iterator&);
 755         void emitSlow_op_call(Instruction*, Vector<SlowCaseEntry>::iterator&);
 756         void emitSlow_op_call_eval(Instruction*, Vector<SlowCaseEntry>::iterator&);
 757         void emitSlow_op_call_varargs(Instruction*, Vector<SlowCaseEntry>::iterator&);
 758         void emitSlow_op_construct(Instruction*, Vector<SlowCaseEntry>::iterator&);
 759         void emitSlow_op_convert_this(Instruction*, Vector<SlowCaseEntry>::iterator&);
 760         void emitSlow_op_create_this(Instruction*, Vector<SlowCaseEntry>::iterator&);
 761         void emitSlow_op_div(Instruction*, Vector<SlowCaseEntry>::iterator&);
 762         void emitSlow_op_eq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 763         void emitSlow_op_get_by_id(Instruction*, Vector<SlowCaseEntry>::iterator&);
 764         void emitSlow_op_get_arguments_length(Instruction*, Vector<SlowCaseEntry>::iterator&);
 765         void emitSlow_op_get_by_val(Instruction*, Vector<SlowCaseEntry>::iterator&);
 766         void emitSlow_op_get_argument_by_val(Instruction*, Vector<SlowCaseEntry>::iterator&);
 767         void emitSlow_op_get_by_pname(Instruction*, Vector<SlowCaseEntry>::iterator&);
 768         void emitSlow_op_check_has_instance(Instruction*, Vector<SlowCaseEntry>::iterator&);
 769         void emitSlow_op_instanceof(Instruction*, Vector<SlowCaseEntry>::iterator&);
 770         void emitSlow_op_jfalse(Instruction*, Vector<SlowCaseEntry>::iterator&);
 771         void emitSlow_op_jless(Instruction*, Vector<SlowCaseEntry>::iterator&);
 772         void emitSlow_op_jlesseq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 773         void emitSlow_op_jgreater(Instruction*, Vector<SlowCaseEntry>::iterator&);
 774         void emitSlow_op_jgreatereq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 775         void emitSlow_op_jnless(Instruction*, Vector<SlowCaseEntry>::iterator&);
 776         void emitSlow_op_jnlesseq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 777         void emitSlow_op_jngreater(Instruction*, Vector<SlowCaseEntry>::iterator&);
 778         void emitSlow_op_jngreatereq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 779         void emitSlow_op_jtrue(Instruction*, Vector<SlowCaseEntry>::iterator&);
 780         void emitSlow_op_loop_hint(Instruction*, Vector<SlowCaseEntry>::iterator&);
 781         void emitSlow_op_lshift(Instruction*, Vector<SlowCaseEntry>::iterator&);
 782         void emitSlow_op_mod(Instruction*, Vector<SlowCaseEntry>::iterator&);
 783         void emitSlow_op_mul(Instruction*, Vector<SlowCaseEntry>::iterator&);
 784         void emitSlow_op_negate(Instruction*, Vector<SlowCaseEntry>::iterator&);
 785         void emitSlow_op_neq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 786         void emitSlow_op_new_object(Instruction*, Vector<SlowCaseEntry>::iterator&);
 787         void emitSlow_op_not(Instruction*, Vector<SlowCaseEntry>::iterator&);
 788         void emitSlow_op_nstricteq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 789         void emitSlow_op_dec(Instruction*, Vector<SlowCaseEntry>::iterator&);
 790         void emitSlow_op_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_init_global_const_check(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_number(Instruction*, Vector<SlowCaseEntry>::iterator&);
 798         void emitSlow_op_to_primitive(Instruction*, Vector<SlowCaseEntry>::iterator&);
 799         void emitSlow_op_urshift(Instruction*, Vector<SlowCaseEntry>::iterator&);
 800
 801         void emitSlow_op_resolve(Instruction*, Vector<SlowCaseEntry>::iterator&);
 802         void emitSlow_op_resolve_base(Instruction*, Vector<SlowCaseEntry>::iterator&);
 803         void emitSlow_op_resolve_with_base(Instruction*, Vector<SlowCaseEntry>::iterator&);
 804         void emitSlow_op_resolve_with_this(Instruction*, Vector<SlowCaseEntry>::iterator&);
 805         void emitSlow_op_put_to_base(Instruction*, Vector<SlowCaseEntry>::iterator&);
 806
 807         void emitRightShift(Instruction*, bool isUnsigned);
 808         void emitRightShiftSlowCase(Instruction*, Vector<SlowCaseEntry>::iterator&, bool isUnsigned);
 809
 810         void emitInitRegister(unsigned dst);
 811
 812         void emitPutIntToCallFrameHeader(RegisterID from, JSStack::CallFrameHeaderEntry);
 813         void emitGetFromCallFrameHeaderPtr(JSStack::CallFrameHeaderEntry, RegisterID to, RegisterID from = callFrameRegister);
 814         void emitGetFromCallFrameHeader32(JSStack::CallFrameHeaderEntry, RegisterID to, RegisterID from = callFrameRegister);
 815 #if USE(JSVALUE64)
 816         void emitGetFromCallFrameHeader64(JSStack::CallFrameHeaderEntry, RegisterID to, RegisterID from = callFrameRegister);
 817 #endif
 818
 819         JSValue getConstantOperand(unsigned src);
 820         bool isOperandConstantImmediateInt(unsigned src);
 821         bool isOperandConstantImmediateChar(unsigned src);
 822
 823         bool atJumpTarget();
 824
 825         Jump getSlowCase(Vector<SlowCaseEntry>::iterator& iter)
 826         {
 827             return iter++->from;
 828         }
 829         void linkSlowCase(Vector<SlowCaseEntry>::iterator& iter)
 830         {
 831             iter->from.link(this);
 832             ++iter;
 833         }
 834         void linkDummySlowCase(Vector<SlowCaseEntry>::iterator& iter)
 835         {
 836             ASSERT(!iter->from.isSet());
 837             ++iter;
 838         }
 839         void linkSlowCaseIfNotJSCell(Vector<SlowCaseEntry>::iterator&, int virtualRegisterIndex);
 840
 841         Jump checkStructure(RegisterID reg, Structure* structure);
 842
 843         void restoreArgumentReferenceForTrampoline();
 844         void updateTopCallFrame();
 845
 846         Call emitNakedCall(CodePtr function = CodePtr());
 847
 848         // Loads the character value of a single character string into dst.
 849         void emitLoadCharacterString(RegisterID src, RegisterID dst, JumpList& failures);
 850
 851 #if ENABLE(DFG_JIT)
 852         void emitEnterOptimizationCheck();
 853 #else
 854         void emitEnterOptimizationCheck() { }
 855 #endif
 856
 857 #ifndef NDEBUG
 858         void printBytecodeOperandTypes(unsigned src1, unsigned src2);
 859 #endif
 860
 861 #if ENABLE(SAMPLING_FLAGS)
 862         void setSamplingFlag(int32_t);
 863         void clearSamplingFlag(int32_t);
 864 #endif
 865
 866 #if ENABLE(SAMPLING_COUNTERS)
 867         void emitCount(AbstractSamplingCounter&, int32_t = 1);
 868 #endif
 869
 870 #if ENABLE(OPCODE_SAMPLING)
 871         void sampleInstruction(Instruction*, bool = false);
 872 #endif
 873
 874 #if ENABLE(CODEBLOCK_SAMPLING)
 875         void sampleCodeBlock(CodeBlock*);
 876 #else
 877         void sampleCodeBlock(CodeBlock*) {}
 878 #endif
 879
 880 #if ENABLE(DFG_JIT)
 881         bool canBeOptimized() { return m_canBeOptimized; }
 882         bool canBeOptimizedOrInlined() { return m_canBeOptimizedOrInlined; }
 883         bool shouldEmitProfiling() { return m_shouldEmitProfiling; }
 884 #else
 885         bool canBeOptimized() { return false; }
 886         bool canBeOptimizedOrInlined() { return false; }
 887         // Enables use of value profiler with tiered compilation turned off,
 888         // in which case all code gets profiled.
 889         bool shouldEmitProfiling() { return false; }
 890 #endif
 891
 892         Interpreter* m_interpreter;
 893         VM* m_vm;
 894         CodeBlock* m_codeBlock;
 895
 896         Vector<CallRecord> m_calls;
 897         Vector<Label> m_labels;
 898         Vector<PropertyStubCompilationInfo> m_propertyAccessCompilationInfo;
 899         Vector<ByValCompilationInfo> m_byValCompilationInfo;
 900         Vector<StructureStubCompilationInfo> m_callStructureStubCompilationInfo;
 901         Vector<JumpTable> m_jmpTable;
 902
 903         unsigned m_bytecodeOffset;
 904         Vector<SlowCaseEntry> m_slowCases;
 905         Vector<SwitchRecord> m_switches;
 906
 907         unsigned m_propertyAccessInstructionIndex;
 908         unsigned m_byValInstructionIndex;
 909         unsigned m_globalResolveInfoIndex;
 910         unsigned m_callLinkInfoIndex;
 911
 912 #if USE(JSVALUE32_64)
 913         unsigned m_jumpTargetIndex;
 914         unsigned m_mappedBytecodeOffset;
 915         int m_mappedVirtualRegisterIndex;
 916         RegisterID m_mappedTag;
 917         RegisterID m_mappedPayload;
 918 #else
 919         int m_lastResultBytecodeRegister;
 920 #endif
 921         unsigned m_jumpTargetsPosition;
 922
 923 #ifndef NDEBUG
 924 #if defined(ASSEMBLER_HAS_CONSTANT_POOL) && ASSEMBLER_HAS_CONSTANT_POOL
 925         Label m_uninterruptedInstructionSequenceBegin;
 926         int m_uninterruptedConstantSequenceBegin;
 927 #endif
 928 #endif
 929         OwnPtr<JITDisassembler> m_disassembler;
 930         RefPtr<Profiler::Compilation> m_compilation;
 931         WeakRandom m_randomGenerator;
 932         static CodeRef stringGetByValStubGenerator(VM*);
 933
 934 #if ENABLE(VALUE_PROFILER)
 935         bool m_canBeOptimized;
 936         bool m_canBeOptimizedOrInlined;
 937         bool m_shouldEmitProfiling;
 938 #endif
 939     } JIT_CLASS_ALIGNMENT;
 940
 941 } // namespace JSC
 942
 943 #endif // ENABLE(JIT)
 944
 945 #endif // JIT_h