Source/JavaScriptCore/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_UNUSED(variable, actual, expected) ASSERT_WITH_MESSAGE_UNUSED(variable, actual == expected, "JIT Offset \"%s\" should be %d, not %d.\n", #expected, static_cast<int>(expected), static_cast<int>(actual));
  45 #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));
  46
  47 #include "CodeBlock.h"
  48 #include "CompactJITCodeMap.h"
  49 #include "Interpreter.h"
  50 #include "JSInterfaceJIT.h"
  51 #include "Opcode.h"
  52 #include "Profiler.h"
  53 #include <bytecode/SamplingTool.h>
  54
  55 namespace JSC {
  56
  57     class CodeBlock;
  58     class FunctionExecutable;
  59     class JIT;
  60     class JSPropertyNameIterator;
  61     class Interpreter;
  62     class Register;
  63     class RegisterFile;
  64     class ScopeChainNode;
  65     class StructureChain;
  66
  67     struct CallLinkInfo;
  68     struct Instruction;
  69     struct OperandTypes;
  70     struct PolymorphicAccessStructureList;
  71     struct SimpleJumpTable;
  72     struct StringJumpTable;
  73     struct StructureStubInfo;
  74
  75     struct CallRecord {
  76         MacroAssembler::Call from;
  77         unsigned bytecodeOffset;
  78         void* to;
  79
  80         CallRecord()
  81         {
  82         }
  83
  84         CallRecord(MacroAssembler::Call from, unsigned bytecodeOffset, void* to = 0)
  85             : from(from)
  86             , bytecodeOffset(bytecodeOffset)
  87             , to(to)
  88         {
  89         }
  90     };
  91
  92     struct JumpTable {
  93         MacroAssembler::Jump from;
  94         unsigned toBytecodeOffset;
  95
  96         JumpTable(MacroAssembler::Jump f, unsigned t)
  97             : from(f)
  98             , toBytecodeOffset(t)
  99         {
 100         }
 101     };
 102
 103     struct SlowCaseEntry {
 104         MacroAssembler::Jump from;
 105         unsigned to;
 106         unsigned hint;
 107
 108         SlowCaseEntry(MacroAssembler::Jump f, unsigned t, unsigned h = 0)
 109             : from(f)
 110             , to(t)
 111             , hint(h)
 112         {
 113         }
 114     };
 115
 116     struct SwitchRecord {
 117         enum Type {
 118             Immediate,
 119             Character,
 120             String
 121         };
 122
 123         Type type;
 124
 125         union {
 126             SimpleJumpTable* simpleJumpTable;
 127             StringJumpTable* stringJumpTable;
 128         } jumpTable;
 129
 130         unsigned bytecodeOffset;
 131         unsigned defaultOffset;
 132
 133         SwitchRecord(SimpleJumpTable* jumpTable, unsigned bytecodeOffset, unsigned defaultOffset, Type type)
 134             : type(type)
 135             , bytecodeOffset(bytecodeOffset)
 136             , defaultOffset(defaultOffset)
 137         {
 138             this->jumpTable.simpleJumpTable = jumpTable;
 139         }
 140
 141         SwitchRecord(StringJumpTable* jumpTable, unsigned bytecodeOffset, unsigned defaultOffset)
 142             : type(String)
 143             , bytecodeOffset(bytecodeOffset)
 144             , defaultOffset(defaultOffset)
 145         {
 146             this->jumpTable.stringJumpTable = jumpTable;
 147         }
 148     };
 149
 150     struct PropertyStubCompilationInfo {
 151         unsigned bytecodeIndex;
 152         MacroAssembler::Call callReturnLocation;
 153         MacroAssembler::Label hotPathBegin;
 154
 155 #if !ASSERT_DISABLED
 156         PropertyStubCompilationInfo()
 157             : bytecodeIndex(std::numeric_limits<unsigned>::max())
 158         {
 159         }
 160 #endif
 161     };
 162
 163     struct StructureStubCompilationInfo {
 164         MacroAssembler::DataLabelPtr hotPathBegin;
 165         MacroAssembler::Call hotPathOther;
 166         MacroAssembler::Call callReturnLocation;
 167         CallLinkInfo::CallType callType;
 168         unsigned bytecodeIndex;
 169     };
 170
 171     struct MethodCallCompilationInfo {
 172         MethodCallCompilationInfo(unsigned bytecodeIndex, unsigned propertyAccessIndex)
 173             : bytecodeIndex(bytecodeIndex)
 174             , propertyAccessIndex(propertyAccessIndex)
 175         {
 176         }
 177
 178         unsigned bytecodeIndex;
 179         MacroAssembler::DataLabelPtr structureToCompare;
 180         unsigned propertyAccessIndex;
 181     };
 182
 183     // Near calls can only be patched to other JIT code, regular calls can be patched to JIT code or relinked to stub functions.
 184     void ctiPatchNearCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, MacroAssemblerCodePtr newCalleeFunction);
 185     void ctiPatchCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, MacroAssemblerCodePtr newCalleeFunction);
 186     void ctiPatchCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, FunctionPtr newCalleeFunction);
 187
 188     class JIT : private JSInterfaceJIT {
 189         friend class JITStubCall;
 190
 191         using MacroAssembler::Jump;
 192         using MacroAssembler::JumpList;
 193         using MacroAssembler::Label;
 194
 195         static const int patchGetByIdDefaultStructure = -1;
 196         static const int patchGetByIdDefaultOffset = 0;
 197         // Magic number - initial offset cannot be representable as a signed 8bit value, or the X86Assembler
 198         // will compress the displacement, and we may not be able to fit a patched offset.
 199         static const int patchPutByIdDefaultOffset = 256;
 200
 201     public:
 202         static JITCode compile(JSGlobalData* globalData, CodeBlock* codeBlock, CodePtr* functionEntryArityCheck = 0)
 203         {
 204             return JIT(globalData, codeBlock).privateCompile(functionEntryArityCheck);
 205         }
 206
 207         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)
 208         {
 209             JIT jit(globalData, codeBlock);
 210             jit.privateCompileGetByIdProto(stubInfo, structure, prototypeStructure, ident, slot, cachedOffset, returnAddress, callFrame);
 211         }
 212
 213         static void compileGetByIdSelfList(JSGlobalData* globalData, CodeBlock* codeBlock, StructureStubInfo* stubInfo, PolymorphicAccessStructureList* polymorphicStructures, int currentIndex, Structure* structure, const Identifier& ident, const PropertySlot& slot, size_t cachedOffset)
 214         {
 215             JIT jit(globalData, codeBlock);
 216             jit.privateCompileGetByIdSelfList(stubInfo, polymorphicStructures, currentIndex, structure, ident, slot, cachedOffset);
 217         }
 218         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)
 219         {
 220             JIT jit(globalData, codeBlock);
 221             jit.privateCompileGetByIdProtoList(stubInfo, prototypeStructureList, currentIndex, structure, prototypeStructure, ident, slot, cachedOffset, callFrame);
 222         }
 223         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)
 224         {
 225             JIT jit(globalData, codeBlock);
 226             jit.privateCompileGetByIdChainList(stubInfo, prototypeStructureList, currentIndex, structure, chain, count, ident, slot, cachedOffset, callFrame);
 227         }
 228
 229         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)
 230         {
 231             JIT jit(globalData, codeBlock);
 232             jit.privateCompileGetByIdChain(stubInfo, structure, chain, count, ident, slot, cachedOffset, returnAddress, callFrame);
 233         }
 234
 235         static void compilePutByIdTransition(JSGlobalData* globalData, CodeBlock* codeBlock, StructureStubInfo* stubInfo, Structure* oldStructure, Structure* newStructure, size_t cachedOffset, StructureChain* chain, ReturnAddressPtr returnAddress, bool direct)
 236         {
 237             JIT jit(globalData, codeBlock);
 238             jit.privateCompilePutByIdTransition(stubInfo, oldStructure, newStructure, cachedOffset, chain, returnAddress, direct);
 239         }
 240
 241         static PassRefPtr<ExecutableMemoryHandle> compileCTIMachineTrampolines(JSGlobalData* globalData, TrampolineStructure *trampolines)
 242         {
 243             if (!globalData->canUseJIT())
 244                 return 0;
 245             JIT jit(globalData, 0);
 246             return jit.privateCompileCTIMachineTrampolines(globalData, trampolines);
 247         }
 248
 249         static CodeRef compileCTINativeCall(JSGlobalData* globalData, NativeFunction func)
 250         {
 251             if (!globalData->canUseJIT())
 252                 return CodeRef();
 253             JIT jit(globalData, 0);
 254             return jit.privateCompileCTINativeCall(globalData, func);
 255         }
 256
 257         static void resetPatchGetById(RepatchBuffer&, StructureStubInfo*);
 258         static void resetPatchPutById(RepatchBuffer&, StructureStubInfo*);
 259         static void patchGetByIdSelf(CodeBlock* codeblock, StructureStubInfo*, Structure*, size_t cachedOffset, ReturnAddressPtr returnAddress);
 260         static void patchPutByIdReplace(CodeBlock* codeblock, StructureStubInfo*, Structure*, size_t cachedOffset, ReturnAddressPtr returnAddress, bool direct);
 261         static void patchMethodCallProto(JSGlobalData&, CodeBlock* codeblock, MethodCallLinkInfo&, JSObject*, Structure*, JSObject*, ReturnAddressPtr);
 262
 263         static void compilePatchGetArrayLength(JSGlobalData* globalData, CodeBlock* codeBlock, ReturnAddressPtr returnAddress)
 264         {
 265             JIT jit(globalData, codeBlock);
 266             return jit.privateCompilePatchGetArrayLength(returnAddress);
 267         }
 268
 269         static void linkFor(JSFunction* callee, CodeBlock* callerCodeBlock, CodeBlock* calleeCodeBlock, CodePtr, CallLinkInfo*, JSGlobalData*, CodeSpecializationKind);
 270
 271     private:
 272         struct JSRInfo {
 273             DataLabelPtr storeLocation;
 274             Label target;
 275
 276             JSRInfo(DataLabelPtr storeLocation, Label targetLocation)
 277                 : storeLocation(storeLocation)
 278                 , target(targetLocation)
 279             {
 280             }
 281         };
 282
 283         JIT(JSGlobalData*, CodeBlock* = 0);
 284
 285         void privateCompileMainPass();
 286         void privateCompileLinkPass();
 287         void privateCompileSlowCases();
 288         JITCode privateCompile(CodePtr* functionEntryArityCheck);
 289         void privateCompileGetByIdProto(StructureStubInfo*, Structure*, Structure* prototypeStructure, const Identifier&, const PropertySlot&, size_t cachedOffset, ReturnAddressPtr returnAddress, CallFrame* callFrame);
 290         void privateCompileGetByIdSelfList(StructureStubInfo*, PolymorphicAccessStructureList*, int, Structure*, const Identifier&, const PropertySlot&, size_t cachedOffset);
 291         void privateCompileGetByIdProtoList(StructureStubInfo*, PolymorphicAccessStructureList*, int, Structure*, Structure* prototypeStructure, const Identifier&, const PropertySlot&, size_t cachedOffset, CallFrame* callFrame);
 292         void privateCompileGetByIdChainList(StructureStubInfo*, PolymorphicAccessStructureList*, int, Structure*, StructureChain* chain, size_t count, const Identifier&, const PropertySlot&, size_t cachedOffset, CallFrame* callFrame);
 293         void privateCompileGetByIdChain(StructureStubInfo*, Structure*, StructureChain*, size_t count, const Identifier&, const PropertySlot&, size_t cachedOffset, ReturnAddressPtr returnAddress, CallFrame* callFrame);
 294         void privateCompilePutByIdTransition(StructureStubInfo*, Structure*, Structure*, size_t cachedOffset, StructureChain*, ReturnAddressPtr returnAddress, bool direct);
 295
 296         PassRefPtr<ExecutableMemoryHandle> privateCompileCTIMachineTrampolines(JSGlobalData*, TrampolineStructure*);
 297         Label privateCompileCTINativeCall(JSGlobalData*, bool isConstruct = false);
 298         CodeRef privateCompileCTINativeCall(JSGlobalData*, NativeFunction);
 299         void privateCompilePatchGetArrayLength(ReturnAddressPtr returnAddress);
 300
 301         static bool isDirectPutById(StructureStubInfo*);
 302
 303         void addSlowCase(Jump);
 304         void addSlowCase(JumpList);
 305         void addSlowCase();
 306         void addJump(Jump, int);
 307         void emitJumpSlowToHot(Jump, int);
 308
 309         void compileOpCall(OpcodeID, Instruction*, unsigned callLinkInfoIndex);
 310         void compileOpCallSlowCase(OpcodeID, Instruction*, Vector<SlowCaseEntry>::iterator&, unsigned callLinkInfoIndex);
 311         void compileLoadVarargs(Instruction*);
 312         void compileCallEval();
 313         void compileCallEvalSlowCase(Vector<SlowCaseEntry>::iterator&);
 314
 315         enum CompileOpStrictEqType { OpStrictEq, OpNStrictEq };
 316         void compileOpStrictEq(Instruction* instruction, CompileOpStrictEqType type);
 317         bool isOperandConstantImmediateDouble(unsigned src);
 318
 319         void emitLoadDouble(int index, FPRegisterID value);
 320         void emitLoadInt32ToDouble(int index, FPRegisterID value);
 321         Jump emitJumpIfNotObject(RegisterID structureReg);
 322         Jump emitJumpIfNotType(RegisterID baseReg, RegisterID scratchReg, JSType);
 323
 324         void testPrototype(JSValue, JumpList& failureCases);
 325
 326         enum WriteBarrierMode { UnconditionalWriteBarrier, ShouldFilterImmediates };
 327         // value register in write barrier is used before any scratch registers
 328         // so may safely be the same as either of the scratch registers.
 329         void emitWriteBarrier(RegisterID owner, RegisterID valueTag, RegisterID scratch, RegisterID scratch2, WriteBarrierMode, WriteBarrierUseKind);
 330         void emitWriteBarrier(JSCell* owner, RegisterID value, RegisterID scratch, WriteBarrierMode, WriteBarrierUseKind);
 331
 332         template<typename ClassType, typename StructureType> void emitAllocateBasicJSObject(StructureType, void* vtable, RegisterID result, RegisterID storagePtr);
 333         template<typename T> void emitAllocateJSFinalObject(T structure, RegisterID result, RegisterID storagePtr);
 334         void emitAllocateJSFunction(FunctionExecutable*, RegisterID scopeChain, RegisterID result, RegisterID storagePtr);
 335
 336         enum ValueProfilingSiteKind { FirstProfilingSite, SubsequentProfilingSite };
 337 #if ENABLE(VALUE_PROFILER)
 338         // This assumes that the value to profile is in regT0 and that regT3 is available for
 339         // scratch.
 340         void emitValueProfilingSite(ValueProfilingSiteKind);
 341 #else
 342         void emitValueProfilingSite(ValueProfilingSiteKind) { }
 343 #endif
 344
 345 #if USE(JSVALUE32_64)
 346         bool getOperandConstantImmediateInt(unsigned op1, unsigned op2, unsigned& op, int32_t& constant);
 347
 348         void emitLoadTag(int index, RegisterID tag);
 349         void emitLoadPayload(int index, RegisterID payload);
 350
 351         void emitLoad(const JSValue& v, RegisterID tag, RegisterID payload);
 352         void emitLoad(int index, RegisterID tag, RegisterID payload, RegisterID base = callFrameRegister);
 353         void emitLoad2(int index1, RegisterID tag1, RegisterID payload1, int index2, RegisterID tag2, RegisterID payload2);
 354
 355         void emitStore(int index, RegisterID tag, RegisterID payload, RegisterID base = callFrameRegister);
 356         void emitStore(int index, const JSValue constant, RegisterID base = callFrameRegister);
 357         void emitStoreInt32(int index, RegisterID payload, bool indexIsInt32 = false);
 358         void emitStoreInt32(int index, TrustedImm32 payload, bool indexIsInt32 = false);
 359         void emitStoreAndMapInt32(int index, RegisterID tag, RegisterID payload, bool indexIsInt32, size_t opcodeLength);
 360         void emitStoreCell(int index, RegisterID payload, bool indexIsCell = false);
 361         void emitStoreBool(int index, RegisterID payload, bool indexIsBool = false);
 362         void emitStoreDouble(int index, FPRegisterID value);
 363
 364         bool isLabeled(unsigned bytecodeOffset);
 365         void map(unsigned bytecodeOffset, int virtualRegisterIndex, RegisterID tag, RegisterID payload);
 366         void unmap(RegisterID);
 367         void unmap();
 368         bool isMapped(int virtualRegisterIndex);
 369         bool getMappedPayload(int virtualRegisterIndex, RegisterID& payload);
 370         bool getMappedTag(int virtualRegisterIndex, RegisterID& tag);
 371
 372         void emitJumpSlowCaseIfNotJSCell(int virtualRegisterIndex);
 373         void emitJumpSlowCaseIfNotJSCell(int virtualRegisterIndex, RegisterID tag);
 374
 375         void compileGetByIdHotPath();
 376         void compileGetByIdSlowCase(int resultVReg, int baseVReg, Identifier* ident, Vector<SlowCaseEntry>::iterator& iter, bool isMethodCheck = false);
 377         void compileGetDirectOffset(RegisterID base, RegisterID resultTag, RegisterID resultPayload, size_t cachedOffset);
 378         void compileGetDirectOffset(JSObject* base, RegisterID resultTag, RegisterID resultPayload, size_t cachedOffset);
 379         void compileGetDirectOffset(RegisterID base, RegisterID resultTag, RegisterID resultPayload, RegisterID offset);
 380         void compilePutDirectOffset(RegisterID base, RegisterID valueTag, RegisterID valuePayload, size_t cachedOffset);
 381
 382         // Arithmetic opcode helpers
 383         void emitAdd32Constant(unsigned dst, unsigned op, int32_t constant, ResultType opType);
 384         void emitSub32Constant(unsigned dst, unsigned op, int32_t constant, ResultType opType);
 385         void emitBinaryDoubleOp(OpcodeID, unsigned dst, unsigned op1, unsigned op2, OperandTypes, JumpList& notInt32Op1, JumpList& notInt32Op2, bool op1IsInRegisters = true, bool op2IsInRegisters = true);
 386
 387 #if CPU(X86)
 388         // These architecture specific value are used to enable patching - see comment on op_put_by_id.
 389         static const int patchOffsetPutByIdStructure = 7;
 390         static const int patchOffsetPutByIdPropertyMapOffset1 = 22;
 391         static const int patchOffsetPutByIdPropertyMapOffset2 = 28;
 392         // These architecture specific value are used to enable patching - see comment on op_get_by_id.
 393         static const int patchOffsetGetByIdStructure = 7;
 394         static const int patchOffsetGetByIdBranchToSlowCase = 13;
 395         static const int patchOffsetGetByIdPropertyMapOffset1 = 19;
 396         static const int patchOffsetGetByIdPropertyMapOffset2 = 22;
 397         static const int patchOffsetGetByIdPutResult = 22;
 398 #if ENABLE(OPCODE_SAMPLING)
 399         static const int patchOffsetGetByIdSlowCaseCall = 37;
 400 #else
 401         static const int patchOffsetGetByIdSlowCaseCall = 33;
 402 #endif
 403         static const int patchOffsetOpCallCompareToJump = 6;
 404
 405         static const int patchOffsetMethodCheckProtoObj = 11;
 406         static const int patchOffsetMethodCheckProtoStruct = 18;
 407         static const int patchOffsetMethodCheckPutFunction = 29;
 408 #elif CPU(ARM_TRADITIONAL)
 409         // These architecture specific value are used to enable patching - see comment on op_put_by_id.
 410         static const int patchOffsetPutByIdStructure = 4;
 411         static const int patchOffsetPutByIdPropertyMapOffset1 = 20;
 412         static const int patchOffsetPutByIdPropertyMapOffset2 = 28;
 413         // These architecture specific value are used to enable patching - see comment on op_get_by_id.
 414         static const int patchOffsetGetByIdStructure = 4;
 415         static const int patchOffsetGetByIdBranchToSlowCase = 16;
 416         static const int patchOffsetGetByIdPropertyMapOffset1 = 20;
 417         static const int patchOffsetGetByIdPropertyMapOffset2 = 28;
 418         static const int patchOffsetGetByIdPutResult = 36;
 419 #if ENABLE(OPCODE_SAMPLING)
 420         #error "OPCODE_SAMPLING is not yet supported"
 421 #else
 422         static const int patchOffsetGetByIdSlowCaseCall = 40;
 423 #endif
 424         static const int patchOffsetOpCallCompareToJump = 12;
 425
 426         static const int patchOffsetMethodCheckProtoObj = 12;
 427         static const int patchOffsetMethodCheckProtoStruct = 20;
 428         static const int patchOffsetMethodCheckPutFunction = 32;
 429
 430         // sequenceOpCall
 431         static const int sequenceOpCallInstructionSpace = 12;
 432         static const int sequenceOpCallConstantSpace = 2;
 433         // sequenceMethodCheck
 434         static const int sequenceMethodCheckInstructionSpace = 40;
 435         static const int sequenceMethodCheckConstantSpace = 6;
 436         // sequenceGetByIdHotPath
 437         static const int sequenceGetByIdHotPathInstructionSpace = 36;
 438         static const int sequenceGetByIdHotPathConstantSpace = 4;
 439         // sequenceGetByIdSlowCase
 440         static const int sequenceGetByIdSlowCaseInstructionSpace = 56;
 441         static const int sequenceGetByIdSlowCaseConstantSpace = 3;
 442         // sequencePutById
 443         static const int sequencePutByIdInstructionSpace = 36;
 444         static const int sequencePutByIdConstantSpace = 4;
 445 #elif CPU(ARM_THUMB2)
 446         // These architecture specific value are used to enable patching - see comment on op_put_by_id.
 447         static const int patchOffsetPutByIdStructure = 10;
 448         static const int patchOffsetPutByIdPropertyMapOffset1 = 36;
 449         static const int patchOffsetPutByIdPropertyMapOffset2 = 48;
 450         // These architecture specific value are used to enable patching - see comment on op_get_by_id.
 451         static const int patchOffsetGetByIdStructure = 10;
 452         static const int patchOffsetGetByIdBranchToSlowCase = 26;
 453         static const int patchOffsetGetByIdPropertyMapOffset1 = 28;
 454         static const int patchOffsetGetByIdPropertyMapOffset2 = 30;
 455         static const int patchOffsetGetByIdPutResult = 32;
 456 #if ENABLE(OPCODE_SAMPLING)
 457         #error "OPCODE_SAMPLING is not yet supported"
 458 #else
 459         static const int patchOffsetGetByIdSlowCaseCall = 40;
 460 #endif
 461         static const int patchOffsetOpCallCompareToJump = 16;
 462
 463         static const int patchOffsetMethodCheckProtoObj = 24;
 464         static const int patchOffsetMethodCheckProtoStruct = 34;
 465         static const int patchOffsetMethodCheckPutFunction = 58;
 466
 467         // sequenceOpCall
 468         static const int sequenceOpCallInstructionSpace = 12;
 469         static const int sequenceOpCallConstantSpace = 2;
 470         // sequenceMethodCheck
 471         static const int sequenceMethodCheckInstructionSpace = 40;
 472         static const int sequenceMethodCheckConstantSpace = 6;
 473         // sequenceGetByIdHotPath
 474         static const int sequenceGetByIdHotPathInstructionSpace = 36;
 475         static const int sequenceGetByIdHotPathConstantSpace = 4;
 476         // sequenceGetByIdSlowCase
 477         static const int sequenceGetByIdSlowCaseInstructionSpace = 40;
 478         static const int sequenceGetByIdSlowCaseConstantSpace = 2;
 479         // sequencePutById
 480         static const int sequencePutByIdInstructionSpace = 36;
 481         static const int sequencePutByIdConstantSpace = 4;
 482 #elif CPU(MIPS)
 483 #if WTF_MIPS_ISA(1)
 484         static const int patchOffsetPutByIdStructure = 16;
 485         static const int patchOffsetPutByIdPropertyMapOffset1 = 56;
 486         static const int patchOffsetPutByIdPropertyMapOffset2 = 72;
 487         static const int patchOffsetGetByIdStructure = 16;
 488         static const int patchOffsetGetByIdBranchToSlowCase = 48;
 489         static const int patchOffsetGetByIdPropertyMapOffset1 = 56;
 490         static const int patchOffsetGetByIdPropertyMapOffset2 = 76;
 491         static const int patchOffsetGetByIdPutResult = 96;
 492 #if ENABLE(OPCODE_SAMPLING)
 493         #error "OPCODE_SAMPLING is not yet supported"
 494 #else
 495         static const int patchOffsetGetByIdSlowCaseCall = 56;
 496 #endif
 497         static const int patchOffsetOpCallCompareToJump = 32;
 498         static const int patchOffsetMethodCheckProtoObj = 32;
 499         static const int patchOffsetMethodCheckProtoStruct = 56;
 500         static const int patchOffsetMethodCheckPutFunction = 88;
 501 #else // WTF_MIPS_ISA(1)
 502         static const int patchOffsetPutByIdStructure = 12;
 503         static const int patchOffsetPutByIdPropertyMapOffset1 = 48;
 504         static const int patchOffsetPutByIdPropertyMapOffset2 = 64;
 505         static const int patchOffsetGetByIdStructure = 12;
 506         static const int patchOffsetGetByIdBranchToSlowCase = 44;
 507         static const int patchOffsetGetByIdPropertyMapOffset1 = 48;
 508         static const int patchOffsetGetByIdPropertyMapOffset2 = 64;
 509         static const int patchOffsetGetByIdPutResult = 80;
 510 #if ENABLE(OPCODE_SAMPLING)
 511         #error "OPCODE_SAMPLING is not yet supported"
 512 #else
 513         static const int patchOffsetGetByIdSlowCaseCall = 56;
 514 #endif
 515         static const int patchOffsetOpCallCompareToJump = 32;
 516         static const int patchOffsetMethodCheckProtoObj = 32;
 517         static const int patchOffsetMethodCheckProtoStruct = 52;
 518         static const int patchOffsetMethodCheckPutFunction = 84;
 519 #endif
 520 #elif CPU(SH4)
 521        // These architecture specific value are used to enable patching - see comment on op_put_by_id.
 522         static const int patchOffsetGetByIdStructure = 6;
 523         static const int patchOffsetPutByIdPropertyMapOffset = 24;
 524         static const int patchOffsetPutByIdStructure = 6;
 525         // These architecture specific value are used to enable patching - see comment on op_get_by_id.
 526         static const int patchOffsetGetByIdBranchToSlowCase = 10;
 527         static const int patchOffsetGetByIdPropertyMapOffset = 24;
 528         static const int patchOffsetGetByIdPutResult = 24;
 529
 530         // sequenceOpCall
 531         static const int sequenceOpCallInstructionSpace = 12;
 532         static const int sequenceOpCallConstantSpace = 2;
 533         // sequenceMethodCheck
 534         static const int sequenceMethodCheckInstructionSpace = 40;
 535         static const int sequenceMethodCheckConstantSpace = 6;
 536         // sequenceGetByIdHotPath
 537         static const int sequenceGetByIdHotPathInstructionSpace = 36;
 538         static const int sequenceGetByIdHotPathConstantSpace = 5;
 539         // sequenceGetByIdSlowCase
 540         static const int sequenceGetByIdSlowCaseInstructionSpace = 30;
 541         static const int sequenceGetByIdSlowCaseConstantSpace = 3;
 542         // sequencePutById
 543         static const int sequencePutByIdInstructionSpace = 36;
 544         static const int sequencePutByIdConstantSpace = 5;
 545
 546         static const int patchOffsetGetByIdPropertyMapOffset1 = 20;
 547         static const int patchOffsetGetByIdPropertyMapOffset2 = 22;
 548
 549         static const int patchOffsetPutByIdPropertyMapOffset1 = 20;
 550         static const int patchOffsetPutByIdPropertyMapOffset2 = 26;
 551
 552 #if ENABLE(OPCODE_SAMPLING)
 553         static const int patchOffsetGetByIdSlowCaseCall = 0; // FIMXE
 554 #else
 555         static const int patchOffsetGetByIdSlowCaseCall = 26;
 556 #endif
 557         static const int patchOffsetOpCallCompareToJump = 4;
 558
 559         static const int patchOffsetMethodCheckProtoObj = 12;
 560         static const int patchOffsetMethodCheckProtoStruct = 20;
 561         static const int patchOffsetMethodCheckPutFunction = 32;
 562 #else
 563 #error "JSVALUE32_64 not supported on this platform."
 564 #endif
 565
 566 #else // USE(JSVALUE32_64)
 567         void emitGetVirtualRegister(int src, RegisterID dst);
 568         void emitGetVirtualRegisters(int src1, RegisterID dst1, int src2, RegisterID dst2);
 569         void emitPutVirtualRegister(unsigned dst, RegisterID from = regT0);
 570         void emitStoreCell(unsigned dst, RegisterID payload, bool /* only used in JSValue32_64 */ = false)
 571         {
 572             emitPutVirtualRegister(dst, payload);
 573         }
 574
 575         int32_t getConstantOperandImmediateInt(unsigned src);
 576
 577         void killLastResultRegister();
 578
 579         Jump emitJumpIfJSCell(RegisterID);
 580         Jump emitJumpIfBothJSCells(RegisterID, RegisterID, RegisterID);
 581         void emitJumpSlowCaseIfJSCell(RegisterID);
 582         Jump emitJumpIfNotJSCell(RegisterID);
 583         void emitJumpSlowCaseIfNotJSCell(RegisterID);
 584         void emitJumpSlowCaseIfNotJSCell(RegisterID, int VReg);
 585 #if USE(JSVALUE32_64)
 586         JIT::Jump emitJumpIfImmediateNumber(RegisterID reg)
 587         {
 588             return emitJumpIfImmediateInteger(reg);
 589         }
 590
 591         JIT::Jump emitJumpIfNotImmediateNumber(RegisterID reg)
 592         {
 593             return emitJumpIfNotImmediateInteger(reg);
 594         }
 595 #endif
 596         Jump emitJumpIfImmediateInteger(RegisterID);
 597         Jump emitJumpIfNotImmediateInteger(RegisterID);
 598         Jump emitJumpIfNotImmediateIntegers(RegisterID, RegisterID, RegisterID);
 599         void emitJumpSlowCaseIfNotImmediateInteger(RegisterID);
 600         void emitJumpSlowCaseIfNotImmediateNumber(RegisterID);
 601         void emitJumpSlowCaseIfNotImmediateIntegers(RegisterID, RegisterID, RegisterID);
 602
 603 #if USE(JSVALUE32_64)
 604         void emitFastArithDeTagImmediate(RegisterID);
 605         Jump emitFastArithDeTagImmediateJumpIfZero(RegisterID);
 606 #endif
 607         void emitFastArithReTagImmediate(RegisterID src, RegisterID dest);
 608         void emitFastArithIntToImmNoCheck(RegisterID src, RegisterID dest);
 609
 610         void emitTagAsBoolImmediate(RegisterID reg);
 611         void compileBinaryArithOp(OpcodeID, unsigned dst, unsigned src1, unsigned src2, OperandTypes opi);
 612 #if USE(JSVALUE64)
 613         void compileBinaryArithOpSlowCase(OpcodeID, Vector<SlowCaseEntry>::iterator&, unsigned dst, unsigned src1, unsigned src2, OperandTypes, bool op1HasImmediateIntFastCase, bool op2HasImmediateIntFastCase);
 614 #else
 615         void compileBinaryArithOpSlowCase(OpcodeID, Vector<SlowCaseEntry>::iterator&, unsigned dst, unsigned src1, unsigned src2, OperandTypes);
 616 #endif
 617
 618         void compileGetByIdHotPath(int baseVReg, Identifier*);
 619         void compileGetByIdSlowCase(int resultVReg, int baseVReg, Identifier* ident, Vector<SlowCaseEntry>::iterator& iter, bool isMethodCheck = false);
 620         void compileGetDirectOffset(RegisterID base, RegisterID result, size_t cachedOffset);
 621         void compileGetDirectOffset(JSObject* base, RegisterID result, size_t cachedOffset);
 622         void compileGetDirectOffset(RegisterID base, RegisterID result, RegisterID offset, RegisterID scratch);
 623         void compilePutDirectOffset(RegisterID base, RegisterID value, size_t cachedOffset);
 624
 625 #if CPU(X86_64)
 626         // These architecture specific value are used to enable patching - see comment on op_put_by_id.
 627         static const int patchOffsetPutByIdStructure = 10;
 628         static const int patchOffsetPutByIdPropertyMapOffset = 31;
 629         // These architecture specific value are used to enable patching - see comment on op_get_by_id.
 630         static const int patchOffsetGetByIdStructure = 10;
 631         static const int patchOffsetGetByIdBranchToSlowCase = 20;
 632         static const int patchOffsetGetByIdPropertyMapOffset = 28;
 633         static const int patchOffsetGetByIdPutResult = 28;
 634 #if ENABLE(OPCODE_SAMPLING)
 635         static const int patchOffsetGetByIdSlowCaseCall = 64;
 636 #else
 637         static const int patchOffsetGetByIdSlowCaseCall = 54;
 638 #endif
 639         static const int patchOffsetOpCallCompareToJump = 9;
 640
 641         static const int patchOffsetMethodCheckProtoObj = 20;
 642         static const int patchOffsetMethodCheckProtoStruct = 30;
 643         static const int patchOffsetMethodCheckPutFunction = 50;
 644 #elif CPU(X86)
 645         // These architecture specific value are used to enable patching - see comment on op_put_by_id.
 646         static const int patchOffsetPutByIdStructure = 7;
 647         static const int patchOffsetPutByIdPropertyMapOffset = 22;
 648         // These architecture specific value are used to enable patching - see comment on op_get_by_id.
 649         static const int patchOffsetGetByIdStructure = 7;
 650         static const int patchOffsetGetByIdBranchToSlowCase = 13;
 651         static const int patchOffsetGetByIdPropertyMapOffset = 22;
 652         static const int patchOffsetGetByIdPutResult = 22;
 653 #if ENABLE(OPCODE_SAMPLING)
 654         static const int patchOffsetGetByIdSlowCaseCall = 33;
 655 #else
 656         static const int patchOffsetGetByIdSlowCaseCall = 23;
 657 #endif
 658         static const int patchOffsetOpCallCompareToJump = 6;
 659
 660         static const int patchOffsetMethodCheckProtoObj = 11;
 661         static const int patchOffsetMethodCheckProtoStruct = 18;
 662         static const int patchOffsetMethodCheckPutFunction = 29;
 663 #elif CPU(ARM_THUMB2)
 664         // These architecture specific value are used to enable patching - see comment on op_put_by_id.
 665         static const int patchOffsetPutByIdStructure = 10;
 666         static const int patchOffsetPutByIdPropertyMapOffset = 46;
 667         // These architecture specific value are used to enable patching - see comment on op_get_by_id.
 668         static const int patchOffsetGetByIdStructure = 10;
 669         static const int patchOffsetGetByIdBranchToSlowCase = 26;
 670         static const int patchOffsetGetByIdPropertyMapOffset = 46;
 671         static const int patchOffsetGetByIdPutResult = 50;
 672 #if ENABLE(OPCODE_SAMPLING)
 673         static const int patchOffsetGetByIdSlowCaseCall = 0; // FIMXE
 674 #else
 675         static const int patchOffsetGetByIdSlowCaseCall = 28;
 676 #endif
 677         static const int patchOffsetOpCallCompareToJump = 16;
 678
 679         static const int patchOffsetMethodCheckProtoObj = 24;
 680         static const int patchOffsetMethodCheckProtoStruct = 34;
 681         static const int patchOffsetMethodCheckPutFunction = 58;
 682 #elif CPU(ARM_TRADITIONAL)
 683         // These architecture specific value are used to enable patching - see comment on op_put_by_id.
 684         static const int patchOffsetPutByIdStructure = 4;
 685         static const int patchOffsetPutByIdPropertyMapOffset = 20;
 686         // These architecture specific value are used to enable patching - see comment on op_get_by_id.
 687         static const int patchOffsetGetByIdStructure = 4;
 688         static const int patchOffsetGetByIdBranchToSlowCase = 16;
 689         static const int patchOffsetGetByIdPropertyMapOffset = 20;
 690         static const int patchOffsetGetByIdPutResult = 28;
 691 #if ENABLE(OPCODE_SAMPLING)
 692         #error "OPCODE_SAMPLING is not yet supported"
 693 #else
 694         static const int patchOffsetGetByIdSlowCaseCall = 28;
 695 #endif
 696         static const int patchOffsetOpCallCompareToJump = 12;
 697
 698         static const int patchOffsetMethodCheckProtoObj = 12;
 699         static const int patchOffsetMethodCheckProtoStruct = 20;
 700         static const int patchOffsetMethodCheckPutFunction = 32;
 701
 702         // sequenceOpCall
 703         static const int sequenceOpCallInstructionSpace = 12;
 704         static const int sequenceOpCallConstantSpace = 2;
 705         // sequenceMethodCheck
 706         static const int sequenceMethodCheckInstructionSpace = 40;
 707         static const int sequenceMethodCheckConstantSpace = 6;
 708         // sequenceGetByIdHotPath
 709         static const int sequenceGetByIdHotPathInstructionSpace = 28;
 710         static const int sequenceGetByIdHotPathConstantSpace = 3;
 711         // sequenceGetByIdSlowCase
 712         static const int sequenceGetByIdSlowCaseInstructionSpace = 32;
 713         static const int sequenceGetByIdSlowCaseConstantSpace = 2;
 714         // sequencePutById
 715         static const int sequencePutByIdInstructionSpace = 28;
 716         static const int sequencePutByIdConstantSpace = 3;
 717 #elif CPU(MIPS)
 718 #if WTF_MIPS_ISA(1)
 719         static const int patchOffsetPutByIdStructure = 16;
 720         static const int patchOffsetPutByIdPropertyMapOffset = 68;
 721         static const int patchOffsetGetByIdStructure = 16;
 722         static const int patchOffsetGetByIdBranchToSlowCase = 48;
 723         static const int patchOffsetGetByIdPropertyMapOffset = 68;
 724         static const int patchOffsetGetByIdPutResult = 88;
 725 #if ENABLE(OPCODE_SAMPLING)
 726         #error "OPCODE_SAMPLING is not yet supported"
 727 #else
 728         static const int patchOffsetGetByIdSlowCaseCall = 40;
 729 #endif
 730         static const int patchOffsetOpCallCompareToJump = 32;
 731         static const int patchOffsetMethodCheckProtoObj = 32;
 732         static const int patchOffsetMethodCheckProtoStruct = 56;
 733         static const int patchOffsetMethodCheckPutFunction = 88;
 734 #else // WTF_MIPS_ISA(1)
 735         static const int patchOffsetPutByIdStructure = 12;
 736         static const int patchOffsetPutByIdPropertyMapOffset = 60;
 737         static const int patchOffsetGetByIdStructure = 12;
 738         static const int patchOffsetGetByIdBranchToSlowCase = 44;
 739         static const int patchOffsetGetByIdPropertyMapOffset = 60;
 740         static const int patchOffsetGetByIdPutResult = 76;
 741 #if ENABLE(OPCODE_SAMPLING)
 742         #error "OPCODE_SAMPLING is not yet supported"
 743 #else
 744         static const int patchOffsetGetByIdSlowCaseCall = 40;
 745 #endif
 746         static const int patchOffsetOpCallCompareToJump = 32;
 747         static const int patchOffsetMethodCheckProtoObj = 32;
 748         static const int patchOffsetMethodCheckProtoStruct = 52;
 749         static const int patchOffsetMethodCheckPutFunction = 84;
 750 #endif
 751 #endif
 752 #endif // USE(JSVALUE32_64)
 753
 754 #if (defined(ASSEMBLER_HAS_CONSTANT_POOL) && ASSEMBLER_HAS_CONSTANT_POOL)
 755 #define BEGIN_UNINTERRUPTED_SEQUENCE(name) do { beginUninterruptedSequence(name ## InstructionSpace, name ## ConstantSpace); } while (false)
 756 #define END_UNINTERRUPTED_SEQUENCE_FOR_PUT(name, dst) do { endUninterruptedSequence(name ## InstructionSpace, name ## ConstantSpace, dst); } while (false)
 757 #define END_UNINTERRUPTED_SEQUENCE(name) END_UNINTERRUPTED_SEQUENCE_FOR_PUT(name, 0)
 758
 759         void beginUninterruptedSequence(int, int);
 760         void endUninterruptedSequence(int, int, int);
 761
 762 #else
 763 #define BEGIN_UNINTERRUPTED_SEQUENCE(name)  do { beginUninterruptedSequence(); } while (false)
 764 #define END_UNINTERRUPTED_SEQUENCE(name)  do { endUninterruptedSequence(); } while (false)
 765 #define END_UNINTERRUPTED_SEQUENCE_FOR_PUT(name, dst) do { endUninterruptedSequence(); } while (false)
 766 #endif
 767
 768         void emit_compareAndJump(OpcodeID, unsigned op1, unsigned op2, unsigned target, RelationalCondition);
 769         void emit_compareAndJumpSlow(unsigned op1, unsigned op2, unsigned target, DoubleCondition, int (JIT_STUB *stub)(STUB_ARGS_DECLARATION), bool invert, Vector<SlowCaseEntry>::iterator&);
 770
 771         void emit_op_add(Instruction*);
 772         void emit_op_bitand(Instruction*);
 773         void emit_op_bitnot(Instruction*);
 774         void emit_op_bitor(Instruction*);
 775         void emit_op_bitxor(Instruction*);
 776         void emit_op_call(Instruction*);
 777         void emit_op_call_eval(Instruction*);
 778         void emit_op_call_varargs(Instruction*);
 779         void emit_op_call_put_result(Instruction*);
 780         void emit_op_catch(Instruction*);
 781         void emit_op_construct(Instruction*);
 782         void emit_op_get_callee(Instruction*);
 783         void emit_op_create_this(Instruction*);
 784         void emit_op_convert_this(Instruction*);
 785         void emit_op_create_arguments(Instruction*);
 786         void emit_op_debug(Instruction*);
 787         void emit_op_del_by_id(Instruction*);
 788         void emit_op_div(Instruction*);
 789         void emit_op_end(Instruction*);
 790         void emit_op_enter(Instruction*);
 791         void emit_op_create_activation(Instruction*);
 792         void emit_op_eq(Instruction*);
 793         void emit_op_eq_null(Instruction*);
 794         void emit_op_get_by_id(Instruction*);
 795         void emit_op_get_arguments_length(Instruction*);
 796         void emit_op_get_by_val(Instruction*);
 797         void emit_op_get_argument_by_val(Instruction*);
 798         void emit_op_get_by_pname(Instruction*);
 799         void emit_op_get_global_var(Instruction*);
 800         void emit_op_get_scoped_var(Instruction*);
 801         void emit_op_init_lazy_reg(Instruction*);
 802         void emit_op_check_has_instance(Instruction*);
 803         void emit_op_instanceof(Instruction*);
 804         void emit_op_jeq_null(Instruction*);
 805         void emit_op_jfalse(Instruction*);
 806         void emit_op_jmp(Instruction*);
 807         void emit_op_jmp_scopes(Instruction*);
 808         void emit_op_jneq_null(Instruction*);
 809         void emit_op_jneq_ptr(Instruction*);
 810         void emit_op_jless(Instruction*);
 811         void emit_op_jlesseq(Instruction*);
 812         void emit_op_jgreater(Instruction*);
 813         void emit_op_jgreatereq(Instruction*);
 814         void emit_op_jnless(Instruction*);
 815         void emit_op_jnlesseq(Instruction*);
 816         void emit_op_jngreater(Instruction*);
 817         void emit_op_jngreatereq(Instruction*);
 818         void emit_op_jsr(Instruction*);
 819         void emit_op_jtrue(Instruction*);
 820         void emit_op_loop(Instruction*);
 821         void emit_op_loop_hint(Instruction*);
 822         void emit_op_loop_if_less(Instruction*);
 823         void emit_op_loop_if_lesseq(Instruction*);
 824         void emit_op_loop_if_greater(Instruction*);
 825         void emit_op_loop_if_greatereq(Instruction*);
 826         void emit_op_loop_if_true(Instruction*);
 827         void emit_op_loop_if_false(Instruction*);
 828         void emit_op_lshift(Instruction*);
 829         void emit_op_method_check(Instruction*);
 830         void emit_op_mod(Instruction*);
 831         void emit_op_mov(Instruction*);
 832         void emit_op_mul(Instruction*);
 833         void emit_op_negate(Instruction*);
 834         void emit_op_neq(Instruction*);
 835         void emit_op_neq_null(Instruction*);
 836         void emit_op_new_array(Instruction*);
 837         void emit_op_new_array_buffer(Instruction*);
 838         void emit_op_new_func(Instruction*);
 839         void emit_op_new_func_exp(Instruction*);
 840         void emit_op_new_object(Instruction*);
 841         void emit_op_new_regexp(Instruction*);
 842         void emit_op_get_pnames(Instruction*);
 843         void emit_op_next_pname(Instruction*);
 844         void emit_op_not(Instruction*);
 845         void emit_op_nstricteq(Instruction*);
 846         void emit_op_pop_scope(Instruction*);
 847         void emit_op_post_dec(Instruction*);
 848         void emit_op_post_inc(Instruction*);
 849         void emit_op_pre_dec(Instruction*);
 850         void emit_op_pre_inc(Instruction*);
 851         void emit_op_profile_did_call(Instruction*);
 852         void emit_op_profile_will_call(Instruction*);
 853         void emit_op_push_new_scope(Instruction*);
 854         void emit_op_push_scope(Instruction*);
 855         void emit_op_put_by_id(Instruction*);
 856         void emit_op_put_by_index(Instruction*);
 857         void emit_op_put_by_val(Instruction*);
 858         void emit_op_put_getter(Instruction*);
 859         void emit_op_put_global_var(Instruction*);
 860         void emit_op_put_scoped_var(Instruction*);
 861         void emit_op_put_setter(Instruction*);
 862         void emit_op_resolve(Instruction*);
 863         void emit_op_resolve_base(Instruction*);
 864         void emit_op_ensure_property_exists(Instruction*);
 865         void emit_op_resolve_global(Instruction*, bool dynamic = false);
 866         void emit_op_resolve_global_dynamic(Instruction*);
 867         void emit_op_resolve_skip(Instruction*);
 868         void emit_op_resolve_with_base(Instruction*);
 869         void emit_op_resolve_with_this(Instruction*);
 870         void emit_op_ret(Instruction*);
 871         void emit_op_ret_object_or_this(Instruction*);
 872         void emit_op_rshift(Instruction*);
 873         void emit_op_sret(Instruction*);
 874         void emit_op_strcat(Instruction*);
 875         void emit_op_stricteq(Instruction*);
 876         void emit_op_sub(Instruction*);
 877         void emit_op_switch_char(Instruction*);
 878         void emit_op_switch_imm(Instruction*);
 879         void emit_op_switch_string(Instruction*);
 880         void emit_op_tear_off_activation(Instruction*);
 881         void emit_op_tear_off_arguments(Instruction*);
 882         void emit_op_throw(Instruction*);
 883         void emit_op_throw_reference_error(Instruction*);
 884         void emit_op_to_jsnumber(Instruction*);
 885         void emit_op_to_primitive(Instruction*);
 886         void emit_op_unexpected_load(Instruction*);
 887         void emit_op_urshift(Instruction*);
 888 #if ENABLE(JIT_USE_SOFT_MODULO)
 889         void softModulo();
 890 #endif
 891
 892         void emitSlow_op_add(Instruction*, Vector<SlowCaseEntry>::iterator&);
 893         void emitSlow_op_bitand(Instruction*, Vector<SlowCaseEntry>::iterator&);
 894         void emitSlow_op_bitnot(Instruction*, Vector<SlowCaseEntry>::iterator&);
 895         void emitSlow_op_bitor(Instruction*, Vector<SlowCaseEntry>::iterator&);
 896         void emitSlow_op_bitxor(Instruction*, Vector<SlowCaseEntry>::iterator&);
 897         void emitSlow_op_call(Instruction*, Vector<SlowCaseEntry>::iterator&);
 898         void emitSlow_op_call_eval(Instruction*, Vector<SlowCaseEntry>::iterator&);
 899         void emitSlow_op_call_varargs(Instruction*, Vector<SlowCaseEntry>::iterator&);
 900         void emitSlow_op_construct(Instruction*, Vector<SlowCaseEntry>::iterator&);
 901         void emitSlow_op_convert_this(Instruction*, Vector<SlowCaseEntry>::iterator&);
 902         void emitSlow_op_create_this(Instruction*, Vector<SlowCaseEntry>::iterator&);
 903         void emitSlow_op_div(Instruction*, Vector<SlowCaseEntry>::iterator&);
 904         void emitSlow_op_eq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 905         void emitSlow_op_get_by_id(Instruction*, Vector<SlowCaseEntry>::iterator&);
 906         void emitSlow_op_get_arguments_length(Instruction*, Vector<SlowCaseEntry>::iterator&);
 907         void emitSlow_op_get_by_val(Instruction*, Vector<SlowCaseEntry>::iterator&);
 908         void emitSlow_op_get_argument_by_val(Instruction*, Vector<SlowCaseEntry>::iterator&);
 909         void emitSlow_op_get_by_pname(Instruction*, Vector<SlowCaseEntry>::iterator&);
 910         void emitSlow_op_check_has_instance(Instruction*, Vector<SlowCaseEntry>::iterator&);
 911         void emitSlow_op_instanceof(Instruction*, Vector<SlowCaseEntry>::iterator&);
 912         void emitSlow_op_jfalse(Instruction*, Vector<SlowCaseEntry>::iterator&);
 913         void emitSlow_op_jless(Instruction*, Vector<SlowCaseEntry>::iterator&);
 914         void emitSlow_op_jlesseq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 915         void emitSlow_op_jgreater(Instruction*, Vector<SlowCaseEntry>::iterator&);
 916         void emitSlow_op_jgreatereq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 917         void emitSlow_op_jnless(Instruction*, Vector<SlowCaseEntry>::iterator&);
 918         void emitSlow_op_jnlesseq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 919         void emitSlow_op_jngreater(Instruction*, Vector<SlowCaseEntry>::iterator&);
 920         void emitSlow_op_jngreatereq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 921         void emitSlow_op_jtrue(Instruction*, Vector<SlowCaseEntry>::iterator&);
 922         void emitSlow_op_loop_if_less(Instruction*, Vector<SlowCaseEntry>::iterator&);
 923         void emitSlow_op_loop_if_lesseq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 924         void emitSlow_op_loop_if_greater(Instruction*, Vector<SlowCaseEntry>::iterator&);
 925         void emitSlow_op_loop_if_greatereq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 926         void emitSlow_op_loop_if_true(Instruction*, Vector<SlowCaseEntry>::iterator&);
 927         void emitSlow_op_loop_if_false(Instruction*, Vector<SlowCaseEntry>::iterator&);
 928         void emitSlow_op_lshift(Instruction*, Vector<SlowCaseEntry>::iterator&);
 929         void emitSlow_op_method_check(Instruction*, Vector<SlowCaseEntry>::iterator&);
 930         void emitSlow_op_mod(Instruction*, Vector<SlowCaseEntry>::iterator&);
 931         void emitSlow_op_mul(Instruction*, Vector<SlowCaseEntry>::iterator&);
 932         void emitSlow_op_negate(Instruction*, Vector<SlowCaseEntry>::iterator&);
 933         void emitSlow_op_neq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 934         void emitSlow_op_new_object(Instruction*, Vector<SlowCaseEntry>::iterator&);
 935         void emitSlow_op_not(Instruction*, Vector<SlowCaseEntry>::iterator&);
 936         void emitSlow_op_nstricteq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 937         void emitSlow_op_post_dec(Instruction*, Vector<SlowCaseEntry>::iterator&);
 938         void emitSlow_op_post_inc(Instruction*, Vector<SlowCaseEntry>::iterator&);
 939         void emitSlow_op_pre_dec(Instruction*, Vector<SlowCaseEntry>::iterator&);
 940         void emitSlow_op_pre_inc(Instruction*, Vector<SlowCaseEntry>::iterator&);
 941         void emitSlow_op_put_by_id(Instruction*, Vector<SlowCaseEntry>::iterator&);
 942         void emitSlow_op_put_by_val(Instruction*, Vector<SlowCaseEntry>::iterator&);
 943         void emitSlow_op_resolve_global(Instruction*, Vector<SlowCaseEntry>::iterator&);
 944         void emitSlow_op_resolve_global_dynamic(Instruction*, Vector<SlowCaseEntry>::iterator&);
 945         void emitSlow_op_rshift(Instruction*, Vector<SlowCaseEntry>::iterator&);
 946         void emitSlow_op_stricteq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 947         void emitSlow_op_sub(Instruction*, Vector<SlowCaseEntry>::iterator&);
 948         void emitSlow_op_to_jsnumber(Instruction*, Vector<SlowCaseEntry>::iterator&);
 949         void emitSlow_op_to_primitive(Instruction*, Vector<SlowCaseEntry>::iterator&);
 950         void emitSlow_op_urshift(Instruction*, Vector<SlowCaseEntry>::iterator&);
 951         void emitSlow_op_new_func(Instruction*, Vector<SlowCaseEntry>::iterator&);
 952         void emitSlow_op_new_func_exp(Instruction*, Vector<SlowCaseEntry>::iterator&);
 953
 954
 955         void emitRightShift(Instruction*, bool isUnsigned);
 956         void emitRightShiftSlowCase(Instruction*, Vector<SlowCaseEntry>::iterator&, bool isUnsigned);
 957
 958         /* This function is deprecated. */
 959         void emitGetJITStubArg(unsigned argumentNumber, RegisterID dst);
 960
 961         void emitInitRegister(unsigned dst);
 962
 963         void emitPutToCallFrameHeader(RegisterID from, RegisterFile::CallFrameHeaderEntry entry);
 964         void emitPutCellToCallFrameHeader(RegisterID from, RegisterFile::CallFrameHeaderEntry);
 965         void emitPutIntToCallFrameHeader(RegisterID from, RegisterFile::CallFrameHeaderEntry);
 966         void emitPutImmediateToCallFrameHeader(void* value, RegisterFile::CallFrameHeaderEntry entry);
 967         void emitGetFromCallFrameHeaderPtr(RegisterFile::CallFrameHeaderEntry entry, RegisterID to, RegisterID from = callFrameRegister);
 968         void emitGetFromCallFrameHeader32(RegisterFile::CallFrameHeaderEntry entry, RegisterID to, RegisterID from = callFrameRegister);
 969
 970         JSValue getConstantOperand(unsigned src);
 971         bool isOperandConstantImmediateInt(unsigned src);
 972         bool isOperandConstantImmediateChar(unsigned src);
 973
 974         bool atJumpTarget();
 975
 976         Jump getSlowCase(Vector<SlowCaseEntry>::iterator& iter)
 977         {
 978             return iter++->from;
 979         }
 980         void linkSlowCase(Vector<SlowCaseEntry>::iterator& iter)
 981         {
 982             iter->from.link(this);
 983             ++iter;
 984         }
 985         void linkDummySlowCase(Vector<SlowCaseEntry>::iterator& iter)
 986         {
 987             ASSERT(!iter->from.isSet());
 988             ++iter;
 989         }
 990         void linkSlowCaseIfNotJSCell(Vector<SlowCaseEntry>::iterator&, int virtualRegisterIndex);
 991
 992         Jump checkStructure(RegisterID reg, Structure* structure);
 993
 994         void restoreArgumentReference();
 995         void restoreArgumentReferenceForTrampoline();
 996         void updateTopCallFrame();
 997
 998         Call emitNakedCall(CodePtr function = CodePtr());
 999
1000         void preserveReturnAddressAfterCall(RegisterID);
1001         void restoreReturnAddressBeforeReturn(RegisterID);
1002         void restoreReturnAddressBeforeReturn(Address);
1003
1004         // Loads the character value of a single character string into dst.
1005         void emitLoadCharacterString(RegisterID src, RegisterID dst, JumpList& failures);
1006
1007         enum OptimizationCheckKind { LoopOptimizationCheck, RetOptimizationCheck };
1008 #if ENABLE(DFG_JIT)
1009         void emitOptimizationCheck(OptimizationCheckKind);
1010 #else
1011         void emitOptimizationCheck(OptimizationCheckKind) { }
1012 #endif
1013
1014         void emitTimeoutCheck();
1015 #ifndef NDEBUG
1016         void printBytecodeOperandTypes(unsigned src1, unsigned src2);
1017 #endif
1018
1019 #if ENABLE(SAMPLING_FLAGS)
1020         void setSamplingFlag(int32_t);
1021         void clearSamplingFlag(int32_t);
1022 #endif
1023
1024 #if ENABLE(SAMPLING_COUNTERS)
1025         void emitCount(AbstractSamplingCounter&, int32_t = 1);
1026 #endif
1027
1028 #if ENABLE(OPCODE_SAMPLING)
1029         void sampleInstruction(Instruction*, bool = false);
1030 #endif
1031
1032 #if ENABLE(CODEBLOCK_SAMPLING)
1033         void sampleCodeBlock(CodeBlock*);
1034 #else
1035         void sampleCodeBlock(CodeBlock*) {}
1036 #endif
1037
1038 #if ENABLE(DFG_JIT)
1039         bool canBeOptimized() { return m_canBeOptimized; }
1040         bool shouldEmitProfiling() { return m_canBeOptimized; }
1041 #else
1042         bool canBeOptimized() { return false; }
1043         // Enables use of value profiler with tiered compilation turned off,
1044         // in which case all code gets profiled.
1045         bool shouldEmitProfiling() { return true; }
1046 #endif
1047
1048         Interpreter* m_interpreter;
1049         JSGlobalData* m_globalData;
1050         CodeBlock* m_codeBlock;
1051
1052         Vector<CallRecord> m_calls;
1053         Vector<Label> m_labels;
1054         Vector<PropertyStubCompilationInfo> m_propertyAccessCompilationInfo;
1055         Vector<StructureStubCompilationInfo> m_callStructureStubCompilationInfo;
1056         Vector<MethodCallCompilationInfo> m_methodCallCompilationInfo;
1057         Vector<JumpTable> m_jmpTable;
1058
1059         unsigned m_bytecodeOffset;
1060         Vector<JSRInfo> m_jsrSites;
1061         Vector<SlowCaseEntry> m_slowCases;
1062         Vector<SwitchRecord> m_switches;
1063
1064         unsigned m_propertyAccessInstructionIndex;
1065         unsigned m_globalResolveInfoIndex;
1066         unsigned m_callLinkInfoIndex;
1067
1068 #if USE(JSVALUE32_64)
1069         unsigned m_jumpTargetIndex;
1070         unsigned m_mappedBytecodeOffset;
1071         int m_mappedVirtualRegisterIndex;
1072         RegisterID m_mappedTag;
1073         RegisterID m_mappedPayload;
1074 #else
1075         int m_lastResultBytecodeRegister;
1076 #endif
1077         unsigned m_jumpTargetsPosition;
1078
1079 #ifndef NDEBUG
1080 #if defined(ASSEMBLER_HAS_CONSTANT_POOL) && ASSEMBLER_HAS_CONSTANT_POOL
1081         Label m_uninterruptedInstructionSequenceBegin;
1082         int m_uninterruptedConstantSequenceBegin;
1083 #endif
1084 #endif
1085         WeakRandom m_randomGenerator;
1086         static CodeRef stringGetByValStubGenerator(JSGlobalData*);
1087
1088 #if ENABLE(VALUE_PROFILER)
1089         bool m_canBeOptimized;
1090 #endif
1091     } JIT_CLASS_ALIGNMENT;
1092
1093     inline void JIT::emit_op_loop(Instruction* currentInstruction)
1094     {
1095         emitTimeoutCheck();
1096         emit_op_jmp(currentInstruction);
1097     }
1098
1099     inline void JIT::emit_op_loop_hint(Instruction*)
1100     {
1101         emitOptimizationCheck(LoopOptimizationCheck);
1102     }
1103
1104     inline void JIT::emit_op_loop_if_true(Instruction* currentInstruction)
1105     {
1106         emitTimeoutCheck();
1107         emit_op_jtrue(currentInstruction);
1108     }
1109
1110     inline void JIT::emitSlow_op_loop_if_true(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1111     {
1112         emitSlow_op_jtrue(currentInstruction, iter);
1113     }
1114
1115     inline void JIT::emit_op_loop_if_false(Instruction* currentInstruction)
1116     {
1117         emitTimeoutCheck();
1118         emit_op_jfalse(currentInstruction);
1119     }
1120
1121     inline void JIT::emitSlow_op_loop_if_false(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1122     {
1123         emitSlow_op_jfalse(currentInstruction, iter);
1124     }
1125
1126     inline void JIT::emit_op_loop_if_less(Instruction* currentInstruction)
1127     {
1128         emitTimeoutCheck();
1129         emit_op_jless(currentInstruction);
1130     }
1131
1132     inline void JIT::emitSlow_op_loop_if_less(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1133     {
1134         emitSlow_op_jless(currentInstruction, iter);
1135     }
1136
1137     inline void JIT::emit_op_loop_if_lesseq(Instruction* currentInstruction)
1138     {
1139         emitTimeoutCheck();
1140         emit_op_jlesseq(currentInstruction);
1141     }
1142
1143     inline void JIT::emitSlow_op_loop_if_lesseq(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1144     {
1145         emitSlow_op_jlesseq(currentInstruction, iter);
1146     }
1147
1148     inline void JIT::emit_op_loop_if_greater(Instruction* currentInstruction)
1149     {
1150         emitTimeoutCheck();
1151         emit_op_jgreater(currentInstruction);
1152     }
1153
1154     inline void JIT::emitSlow_op_loop_if_greater(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1155     {
1156         emitSlow_op_jgreater(currentInstruction, iter);
1157     }
1158
1159     inline void JIT::emit_op_loop_if_greatereq(Instruction* currentInstruction)
1160     {
1161         emitTimeoutCheck();
1162         emit_op_jgreatereq(currentInstruction);
1163     }
1164
1165     inline void JIT::emitSlow_op_loop_if_greatereq(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1166     {
1167         emitSlow_op_jgreatereq(currentInstruction, iter);
1168     }
1169
1170 } // namespace JSC
1171
1172 #endif // ENABLE(JIT)
1173
1174 #endif // JIT_h