jit/JIT.h

   1 /*
   2  * Copyright (C) 2008, 2012, 2013, 2014 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 // We've run into some problems where changing the size of the class JIT leads to
  32 // performance fluctuations.  Try forcing alignment in an attempt to stabalize this.
  33 #if COMPILER(GCC)
  34 #define JIT_CLASS_ALIGNMENT __attribute__ ((aligned (32)))
  35 #else
  36 #define JIT_CLASS_ALIGNMENT
  37 #endif
  38
  39 #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));
  40
  41 #include "CodeBlock.h"
  42 #include "CompactJITCodeMap.h"
  43 #include "Interpreter.h"
  44 #include "JITDisassembler.h"
  45 #include "JITInlineCacheGenerator.h"
  46 #include "JSInterfaceJIT.h"
  47 #include "LegacyProfiler.h"
  48 #include "Opcode.h"
  49 #include "ResultType.h"
  50 #include "SamplingTool.h"
  51 #include "UnusedPointer.h"
  52
  53 namespace JSC {
  54
  55     class ArrayAllocationProfile;
  56     class CodeBlock;
  57     class FunctionExecutable;
  58     class JIT;
  59     class JSPropertyNameIterator;
  60     class Identifier;
  61     class Interpreter;
  62     class JSScope;
  63     class JSStack;
  64     class MarkedAllocator;
  65     class Register;
  66     class StructureChain;
  67
  68     struct CallLinkInfo;
  69     struct Instruction;
  70     struct OperandTypes;
  71     struct PolymorphicAccessStructureList;
  72     struct SimpleJumpTable;
  73     struct StringJumpTable;
  74     struct StructureStubInfo;
  75
  76     struct CallRecord {
  77         MacroAssembler::Call from;
  78         unsigned bytecodeOffset;
  79         void* to;
  80
  81         CallRecord()
  82         {
  83         }
  84
  85         CallRecord(MacroAssembler::Call from, unsigned bytecodeOffset, void* to = 0)
  86             : from(from)
  87             , bytecodeOffset(bytecodeOffset)
  88             , to(to)
  89         {
  90         }
  91     };
  92
  93     struct JumpTable {
  94         MacroAssembler::Jump from;
  95         unsigned toBytecodeOffset;
  96
  97         JumpTable(MacroAssembler::Jump f, unsigned t)
  98             : from(f)
  99             , toBytecodeOffset(t)
 100         {
 101         }
 102     };
 103
 104     struct SlowCaseEntry {
 105         MacroAssembler::Jump from;
 106         unsigned to;
 107         unsigned hint;
 108
 109         SlowCaseEntry(MacroAssembler::Jump f, unsigned t, unsigned h = 0)
 110             : from(f)
 111             , to(t)
 112             , hint(h)
 113         {
 114         }
 115     };
 116
 117     struct SwitchRecord {
 118         enum Type {
 119             Immediate,
 120             Character,
 121             String
 122         };
 123
 124         Type type;
 125
 126         union {
 127             SimpleJumpTable* simpleJumpTable;
 128             StringJumpTable* stringJumpTable;
 129         } jumpTable;
 130
 131         unsigned bytecodeOffset;
 132         unsigned defaultOffset;
 133
 134         SwitchRecord(SimpleJumpTable* jumpTable, unsigned bytecodeOffset, unsigned defaultOffset, Type type)
 135             : type(type)
 136             , bytecodeOffset(bytecodeOffset)
 137             , defaultOffset(defaultOffset)
 138         {
 139             this->jumpTable.simpleJumpTable = jumpTable;
 140         }
 141
 142         SwitchRecord(StringJumpTable* jumpTable, unsigned bytecodeOffset, unsigned defaultOffset)
 143             : type(String)
 144             , bytecodeOffset(bytecodeOffset)
 145             , defaultOffset(defaultOffset)
 146         {
 147             this->jumpTable.stringJumpTable = jumpTable;
 148         }
 149     };
 150
 151     struct ByValCompilationInfo {
 152         ByValCompilationInfo() { }
 153
 154         ByValCompilationInfo(unsigned bytecodeIndex, MacroAssembler::PatchableJump badTypeJump, JITArrayMode arrayMode, MacroAssembler::Label doneTarget)
 155             : bytecodeIndex(bytecodeIndex)
 156             , badTypeJump(badTypeJump)
 157             , arrayMode(arrayMode)
 158             , doneTarget(doneTarget)
 159         {
 160         }
 161
 162         unsigned bytecodeIndex;
 163         MacroAssembler::PatchableJump badTypeJump;
 164         JITArrayMode arrayMode;
 165         MacroAssembler::Label doneTarget;
 166         MacroAssembler::Label slowPathTarget;
 167         MacroAssembler::Call returnAddress;
 168     };
 169
 170     struct CallCompilationInfo {
 171         MacroAssembler::DataLabelPtr hotPathBegin;
 172         MacroAssembler::Call hotPathOther;
 173         MacroAssembler::Call callReturnLocation;
 174         CallLinkInfo* callLinkInfo;
 175     };
 176
 177     // Near calls can only be patched to other JIT code, regular calls can be patched to JIT code or relinked to stub functions.
 178     void ctiPatchNearCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, MacroAssemblerCodePtr newCalleeFunction);
 179     void ctiPatchCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, MacroAssemblerCodePtr newCalleeFunction);
 180     void ctiPatchCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, FunctionPtr newCalleeFunction);
 181
 182     class JIT : private JSInterfaceJIT {
 183         friend class JITSlowPathCall;
 184         friend class JITStubCall;
 185
 186         using MacroAssembler::Jump;
 187         using MacroAssembler::JumpList;
 188         using MacroAssembler::Label;
 189
 190         static const uintptr_t patchGetByIdDefaultStructure = unusedPointer;
 191         static const int patchGetByIdDefaultOffset = 0;
 192         // Magic number - initial offset cannot be representable as a signed 8bit value, or the X86Assembler
 193         // will compress the displacement, and we may not be able to fit a patched offset.
 194         static const int patchPutByIdDefaultOffset = 256;
 195
 196     public:
 197         static CompilationResult compile(VM* vm, CodeBlock* codeBlock, JITCompilationEffort effort)
 198         {
 199             return JIT(vm, codeBlock).privateCompile(effort);
 200         }
 201
 202         static void compileClosureCall(VM* vm, CallLinkInfo* callLinkInfo, CodeBlock* callerCodeBlock, CodeBlock* calleeCodeBlock, Structure* expectedStructure, ExecutableBase* expectedExecutable, MacroAssemblerCodePtr codePtr)
 203         {
 204             JIT jit(vm, callerCodeBlock);
 205             jit.m_bytecodeOffset = callLinkInfo->codeOrigin.bytecodeIndex;
 206             jit.privateCompileClosureCall(callLinkInfo, calleeCodeBlock, expectedStructure, expectedExecutable, codePtr);
 207         }
 208
 209         static void compileGetByVal(VM* vm, CodeBlock* codeBlock, ByValInfo* byValInfo, ReturnAddressPtr returnAddress, JITArrayMode arrayMode)
 210         {
 211             JIT jit(vm, codeBlock);
 212             jit.m_bytecodeOffset = byValInfo->bytecodeIndex;
 213             jit.privateCompileGetByVal(byValInfo, returnAddress, arrayMode);
 214         }
 215
 216         static void compilePutByVal(VM* vm, CodeBlock* codeBlock, ByValInfo* byValInfo, ReturnAddressPtr returnAddress, JITArrayMode arrayMode)
 217         {
 218             JIT jit(vm, codeBlock);
 219             jit.m_bytecodeOffset = byValInfo->bytecodeIndex;
 220             jit.privateCompilePutByVal(byValInfo, returnAddress, arrayMode);
 221         }
 222
 223         static void compileDirectPutByVal(VM* vm, CodeBlock* codeBlock, ByValInfo* byValInfo, ReturnAddressPtr returnAddress, JITArrayMode arrayMode)
 224         {
 225             JIT jit(vm, codeBlock);
 226             jit.m_bytecodeOffset = byValInfo->bytecodeIndex;
 227             jit.privateCompilePutByVal(byValInfo, returnAddress, arrayMode);
 228         }
 229
 230         static CodeRef compileCTINativeCall(VM* vm, NativeFunction func)
 231         {
 232             if (!vm->canUseJIT()) {
 233                 return CodeRef::createLLIntCodeRef(llint_native_call_trampoline);
 234             }
 235             JIT jit(vm, 0);
 236             return jit.privateCompileCTINativeCall(vm, func);
 237         }
 238
 239         static unsigned frameRegisterCountFor(CodeBlock*);
 240         static int stackPointerOffsetFor(CodeBlock*);
 241
 242     private:
 243         JIT(VM*, CodeBlock* = 0);
 244
 245         void privateCompileMainPass();
 246         void privateCompileLinkPass();
 247         void privateCompileSlowCases();
 248         CompilationResult privateCompile(JITCompilationEffort);
 249
 250         void privateCompileClosureCall(CallLinkInfo*, CodeBlock* calleeCodeBlock, Structure*, ExecutableBase*, MacroAssemblerCodePtr);
 251
 252         void privateCompileGetByVal(ByValInfo*, ReturnAddressPtr, JITArrayMode);
 253         void privateCompilePutByVal(ByValInfo*, ReturnAddressPtr, JITArrayMode);
 254
 255         Label privateCompileCTINativeCall(VM*, bool isConstruct = false);
 256         CodeRef privateCompileCTINativeCall(VM*, NativeFunction);
 257         void privateCompilePatchGetArrayLength(ReturnAddressPtr returnAddress);
 258
 259         // Add a call out from JIT code, without an exception check.
 260         Call appendCall(const FunctionPtr& function)
 261         {
 262             Call functionCall = call();
 263             m_calls.append(CallRecord(functionCall, m_bytecodeOffset, function.value()));
 264             return functionCall;
 265         }
 266
 267 #if OS(WINDOWS) && CPU(X86_64)
 268         Call appendCallWithSlowPathReturnType(const FunctionPtr& function)
 269         {
 270             Call functionCall = callWithSlowPathReturnType();
 271             m_calls.append(CallRecord(functionCall, m_bytecodeOffset, function.value()));
 272             return functionCall;
 273         }
 274 #endif
 275
 276         void exceptionCheck(Jump jumpToHandler)
 277         {
 278             m_exceptionChecks.append(jumpToHandler);
 279         }
 280
 281         void exceptionCheck()
 282         {
 283             m_exceptionChecks.append(emitExceptionCheck());
 284         }
 285
 286         void exceptionCheckWithCallFrameRollback()
 287         {
 288             m_exceptionChecksWithCallFrameRollback.append(emitExceptionCheck());
 289         }
 290
 291         void privateCompileExceptionHandlers();
 292
 293         void addSlowCase(Jump);
 294         void addSlowCase(JumpList);
 295         void addSlowCase();
 296         void addJump(Jump, int);
 297         void emitJumpSlowToHot(Jump, int);
 298
 299         void compileOpCall(OpcodeID, Instruction*, unsigned callLinkInfoIndex);
 300         void compileOpCallSlowCase(OpcodeID, Instruction*, Vector<SlowCaseEntry>::iterator&, unsigned callLinkInfoIndex);
 301         void compileLoadVarargs(Instruction*);
 302         void compileCallEval(Instruction*);
 303         void compileCallEvalSlowCase(Instruction*, Vector<SlowCaseEntry>::iterator&);
 304         void emitPutCallResult(Instruction*);
 305
 306         enum CompileOpStrictEqType { OpStrictEq, OpNStrictEq };
 307         void compileOpStrictEq(Instruction* instruction, CompileOpStrictEqType type);
 308         bool isOperandConstantImmediateDouble(int src);
 309
 310         void emitLoadDouble(int index, FPRegisterID value);
 311         void emitLoadInt32ToDouble(int index, FPRegisterID value);
 312         Jump emitJumpIfCellNotObject(RegisterID cellReg);
 313
 314         enum WriteBarrierMode { UnconditionalWriteBarrier, ShouldFilterBase, ShouldFilterValue, ShouldFilterBaseAndValue };
 315         // value register in write barrier is used before any scratch registers
 316         // so may safely be the same as either of the scratch registers.
 317         void emitWriteBarrier(unsigned owner, unsigned value, WriteBarrierMode);
 318         void emitWriteBarrier(JSCell* owner, unsigned value, WriteBarrierMode);
 319         void emitWriteBarrier(JSCell* owner);
 320
 321         template<typename StructureType> // StructureType can be RegisterID or ImmPtr.
 322         void emitAllocateJSObject(RegisterID allocator, StructureType, RegisterID result, RegisterID scratch);
 323
 324         // This assumes that the value to profile is in regT0 and that regT3 is available for
 325         // scratch.
 326         void emitValueProfilingSite(ValueProfile*);
 327         void emitValueProfilingSite(unsigned bytecodeOffset);
 328         void emitValueProfilingSite();
 329         void emitArrayProfilingSiteWithCell(RegisterID cell, RegisterID indexingType, ArrayProfile*);
 330         void emitArrayProfilingSiteForBytecodeIndexWithCell(RegisterID cell, RegisterID indexingType, unsigned bytecodeIndex);
 331         void emitArrayProfileStoreToHoleSpecialCase(ArrayProfile*);
 332         void emitArrayProfileOutOfBoundsSpecialCase(ArrayProfile*);
 333
 334         JITArrayMode chooseArrayMode(ArrayProfile*);
 335
 336         // Property is in regT1, base is in regT0. regT2 contains indexing type.
 337         // Property is int-checked and zero extended. Base is cell checked.
 338         // Structure is already profiled. Returns the slow cases. Fall-through
 339         // case contains result in regT0, and it is not yet profiled.
 340         JumpList emitInt32GetByVal(Instruction* instruction, PatchableJump& badType) { return emitContiguousGetByVal(instruction, badType, Int32Shape); }
 341         JumpList emitDoubleGetByVal(Instruction*, PatchableJump& badType);
 342         JumpList emitContiguousGetByVal(Instruction*, PatchableJump& badType, IndexingType expectedShape = ContiguousShape);
 343         JumpList emitArrayStorageGetByVal(Instruction*, PatchableJump& badType);
 344         JumpList emitIntTypedArrayGetByVal(Instruction*, PatchableJump& badType, TypedArrayType);
 345         JumpList emitFloatTypedArrayGetByVal(Instruction*, PatchableJump& badType, TypedArrayType);
 346
 347         // Property is in regT0, base is in regT0. regT2 contains indecing type.
 348         // The value to store is not yet loaded. Property is int-checked and
 349         // zero-extended. Base is cell checked. Structure is already profiled.
 350         // returns the slow cases.
 351         JumpList emitInt32PutByVal(Instruction* currentInstruction, PatchableJump& badType)
 352         {
 353             return emitGenericContiguousPutByVal(currentInstruction, badType, Int32Shape);
 354         }
 355         JumpList emitDoublePutByVal(Instruction* currentInstruction, PatchableJump& badType)
 356         {
 357             return emitGenericContiguousPutByVal(currentInstruction, badType, DoubleShape);
 358         }
 359         JumpList emitContiguousPutByVal(Instruction* currentInstruction, PatchableJump& badType)
 360         {
 361             return emitGenericContiguousPutByVal(currentInstruction, badType);
 362         }
 363         JumpList emitGenericContiguousPutByVal(Instruction*, PatchableJump& badType, IndexingType indexingShape = ContiguousShape);
 364         JumpList emitArrayStoragePutByVal(Instruction*, PatchableJump& badType);
 365         JumpList emitIntTypedArrayPutByVal(Instruction*, PatchableJump& badType, TypedArrayType);
 366         JumpList emitFloatTypedArrayPutByVal(Instruction*, PatchableJump& badType, TypedArrayType);
 367
 368         enum FinalObjectMode { MayBeFinal, KnownNotFinal };
 369
 370         template <typename T> Jump branchStructure(RelationalCondition, T leftHandSide, Structure*);
 371
 372 #if USE(JSVALUE32_64)
 373         bool getOperandConstantImmediateInt(int op1, int op2, int& op, int32_t& constant);
 374
 375         void emitLoadTag(int index, RegisterID tag);
 376         void emitLoadPayload(int index, RegisterID payload);
 377
 378         void emitLoad(const JSValue& v, RegisterID tag, RegisterID payload);
 379         void emitLoad(int index, RegisterID tag, RegisterID payload, RegisterID base = callFrameRegister);
 380         void emitLoad2(int index1, RegisterID tag1, RegisterID payload1, int index2, RegisterID tag2, RegisterID payload2);
 381
 382         void emitStore(int index, RegisterID tag, RegisterID payload, RegisterID base = callFrameRegister);
 383         void emitStore(int index, const JSValue constant, RegisterID base = callFrameRegister);
 384         void emitStoreInt32(int index, RegisterID payload, bool indexIsInt32 = false);
 385         void emitStoreInt32(int index, TrustedImm32 payload, bool indexIsInt32 = false);
 386         void emitStoreCell(int index, RegisterID payload, bool indexIsCell = false);
 387         void emitStoreBool(int index, RegisterID payload, bool indexIsBool = false);
 388         void emitStoreDouble(int index, FPRegisterID value);
 389
 390         void emitJumpSlowCaseIfNotJSCell(int virtualRegisterIndex);
 391         void emitJumpSlowCaseIfNotJSCell(int virtualRegisterIndex, RegisterID tag);
 392
 393         void compileGetByIdHotPath(const Identifier*);
 394         void compileGetDirectOffset(RegisterID base, RegisterID resultTag, RegisterID resultPayload, PropertyOffset cachedOffset);
 395         void compileGetDirectOffset(JSObject* base, RegisterID resultTag, RegisterID resultPayload, PropertyOffset cachedOffset);
 396         void compileGetDirectOffset(RegisterID base, RegisterID resultTag, RegisterID resultPayload, RegisterID offset, FinalObjectMode = MayBeFinal);
 397         void compilePutDirectOffset(RegisterID base, RegisterID valueTag, RegisterID valuePayload, PropertyOffset cachedOffset);
 398
 399         // Arithmetic opcode helpers
 400         void emitAdd32Constant(int dst, int op, int32_t constant, ResultType opType);
 401         void emitSub32Constant(int dst, int op, int32_t constant, ResultType opType);
 402         void emitBinaryDoubleOp(OpcodeID, int dst, int op1, int op2, OperandTypes, JumpList& notInt32Op1, JumpList& notInt32Op2, bool op1IsInRegisters = true, bool op2IsInRegisters = true);
 403
 404 #else // USE(JSVALUE32_64)
 405         void emitGetVirtualRegister(int src, RegisterID dst);
 406         void emitGetVirtualRegister(VirtualRegister src, RegisterID dst);
 407         void emitGetVirtualRegisters(int src1, RegisterID dst1, int src2, RegisterID dst2);
 408         void emitGetVirtualRegisters(VirtualRegister src1, RegisterID dst1, VirtualRegister src2, RegisterID dst2);
 409         void emitPutVirtualRegister(int dst, RegisterID from = regT0);
 410         void emitPutVirtualRegister(VirtualRegister dst, RegisterID from = regT0);
 411         void emitStoreCell(int dst, RegisterID payload, bool /* only used in JSValue32_64 */ = false)
 412         {
 413             emitPutVirtualRegister(dst, payload);
 414         }
 415         void emitStoreCell(VirtualRegister dst, RegisterID payload)
 416         {
 417             emitPutVirtualRegister(dst, payload);
 418         }
 419
 420         int32_t getConstantOperandImmediateInt(int src);
 421
 422         Jump emitJumpIfJSCell(RegisterID);
 423         Jump emitJumpIfBothJSCells(RegisterID, RegisterID, RegisterID);
 424         void emitJumpSlowCaseIfJSCell(RegisterID);
 425         void emitJumpSlowCaseIfNotJSCell(RegisterID);
 426         void emitJumpSlowCaseIfNotJSCell(RegisterID, int VReg);
 427         Jump emitJumpIfImmediateInteger(RegisterID);
 428         Jump emitJumpIfNotImmediateInteger(RegisterID);
 429         Jump emitJumpIfNotImmediateIntegers(RegisterID, RegisterID, RegisterID);
 430         void emitJumpSlowCaseIfNotImmediateInteger(RegisterID);
 431         void emitJumpSlowCaseIfNotImmediateNumber(RegisterID);
 432         void emitJumpSlowCaseIfNotImmediateIntegers(RegisterID, RegisterID, RegisterID);
 433
 434         void emitFastArithReTagImmediate(RegisterID src, RegisterID dest);
 435
 436         void emitTagAsBoolImmediate(RegisterID reg);
 437         void compileBinaryArithOp(OpcodeID, int dst, int src1, int src2, OperandTypes opi);
 438         void compileBinaryArithOpSlowCase(Instruction*, OpcodeID, Vector<SlowCaseEntry>::iterator&, int dst, int src1, int src2, OperandTypes, bool op1HasImmediateIntFastCase, bool op2HasImmediateIntFastCase);
 439
 440         void compileGetByIdHotPath(int baseVReg, const Identifier*);
 441         void compileGetDirectOffset(RegisterID base, RegisterID result, PropertyOffset cachedOffset);
 442         void compileGetDirectOffset(JSObject* base, RegisterID result, PropertyOffset cachedOffset);
 443         void compileGetDirectOffset(RegisterID base, RegisterID result, RegisterID offset, RegisterID scratch, FinalObjectMode = MayBeFinal);
 444         void compilePutDirectOffset(RegisterID base, RegisterID value, PropertyOffset cachedOffset);
 445
 446 #endif // USE(JSVALUE32_64)
 447
 448         void emit_compareAndJump(OpcodeID, int op1, int op2, unsigned target, RelationalCondition);
 449         void emit_compareAndJumpSlow(int op1, int op2, unsigned target, DoubleCondition, size_t (JIT_OPERATION *operation)(ExecState*, EncodedJSValue, EncodedJSValue), bool invert, Vector<SlowCaseEntry>::iterator&);
 450
 451         void emit_op_touch_entry(Instruction*);
 452         void emit_op_add(Instruction*);
 453         void emit_op_bitand(Instruction*);
 454         void emit_op_bitor(Instruction*);
 455         void emit_op_bitxor(Instruction*);
 456         void emit_op_call(Instruction*);
 457         void emit_op_call_eval(Instruction*);
 458         void emit_op_call_varargs(Instruction*);
 459         void emit_op_construct_varargs(Instruction*);
 460         void emit_op_captured_mov(Instruction*);
 461         void emit_op_catch(Instruction*);
 462         void emit_op_construct(Instruction*);
 463         void emit_op_get_callee(Instruction*);
 464         void emit_op_create_this(Instruction*);
 465         void emit_op_to_this(Instruction*);
 466         void emit_op_create_arguments(Instruction*);
 467         void emit_op_debug(Instruction*);
 468         void emit_op_del_by_id(Instruction*);
 469         void emit_op_div(Instruction*);
 470         void emit_op_end(Instruction*);
 471         void emit_op_enter(Instruction*);
 472         void emit_op_create_activation(Instruction*);
 473         void emit_op_eq(Instruction*);
 474         void emit_op_eq_null(Instruction*);
 475         void emit_op_get_by_id(Instruction*);
 476         void emit_op_get_arguments_length(Instruction*);
 477         void emit_op_get_by_val(Instruction*);
 478         void emit_op_get_argument_by_val(Instruction*);
 479         void emit_op_get_by_pname(Instruction*);
 480         void emit_op_init_lazy_reg(Instruction*);
 481         void emit_op_check_has_instance(Instruction*);
 482         void emit_op_instanceof(Instruction*);
 483         void emit_op_is_undefined(Instruction*);
 484         void emit_op_is_boolean(Instruction*);
 485         void emit_op_is_number(Instruction*);
 486         void emit_op_is_string(Instruction*);
 487         void emit_op_jeq_null(Instruction*);
 488         void emit_op_jfalse(Instruction*);
 489         void emit_op_jmp(Instruction*);
 490         void emit_op_jneq_null(Instruction*);
 491         void emit_op_jneq_ptr(Instruction*);
 492         void emit_op_jless(Instruction*);
 493         void emit_op_jlesseq(Instruction*);
 494         void emit_op_jgreater(Instruction*);
 495         void emit_op_jgreatereq(Instruction*);
 496         void emit_op_jnless(Instruction*);
 497         void emit_op_jnlesseq(Instruction*);
 498         void emit_op_jngreater(Instruction*);
 499         void emit_op_jngreatereq(Instruction*);
 500         void emit_op_jtrue(Instruction*);
 501         void emit_op_loop_hint(Instruction*);
 502         void emit_op_lshift(Instruction*);
 503         void emit_op_mod(Instruction*);
 504         void emit_op_mov(Instruction*);
 505         void emit_op_mul(Instruction*);
 506         void emit_op_negate(Instruction*);
 507         void emit_op_neq(Instruction*);
 508         void emit_op_neq_null(Instruction*);
 509         void emit_op_new_array(Instruction*);
 510         void emit_op_new_array_with_size(Instruction*);
 511         void emit_op_new_array_buffer(Instruction*);
 512         void emit_op_new_func(Instruction*);
 513         void emit_op_new_captured_func(Instruction*);
 514         void emit_op_new_func_exp(Instruction*);
 515         void emit_op_new_object(Instruction*);
 516         void emit_op_new_regexp(Instruction*);
 517         void emit_op_get_pnames(Instruction*);
 518         void emit_op_next_pname(Instruction*);
 519         void emit_op_not(Instruction*);
 520         void emit_op_nstricteq(Instruction*);
 521         void emit_op_pop_scope(Instruction*);
 522         void emit_op_dec(Instruction*);
 523         void emit_op_inc(Instruction*);
 524         void emit_op_profile_did_call(Instruction*);
 525         void emit_op_profile_will_call(Instruction*);
 526         void emit_op_push_name_scope(Instruction*);
 527         void emit_op_push_with_scope(Instruction*);
 528         void emit_op_put_by_id(Instruction*);
 529         void emit_op_put_by_index(Instruction*);
 530         void emit_op_put_by_val(Instruction*);
 531         void emit_op_put_getter_setter(Instruction*);
 532         void emit_op_init_global_const(Instruction*);
 533         void emit_op_ret(Instruction*);
 534         void emit_op_ret_object_or_this(Instruction*);
 535         void emit_op_rshift(Instruction*);
 536         void emit_op_strcat(Instruction*);
 537         void emit_op_stricteq(Instruction*);
 538         void emit_op_sub(Instruction*);
 539         void emit_op_switch_char(Instruction*);
 540         void emit_op_switch_imm(Instruction*);
 541         void emit_op_switch_string(Instruction*);
 542         void emit_op_tear_off_activation(Instruction*);
 543         void emit_op_tear_off_arguments(Instruction*);
 544         void emit_op_throw(Instruction*);
 545         void emit_op_throw_static_error(Instruction*);
 546         void emit_op_to_number(Instruction*);
 547         void emit_op_to_primitive(Instruction*);
 548         void emit_op_unexpected_load(Instruction*);
 549         void emit_op_unsigned(Instruction*);
 550         void emit_op_urshift(Instruction*);
 551
 552         void emitSlow_op_add(Instruction*, Vector<SlowCaseEntry>::iterator&);
 553         void emitSlow_op_bitand(Instruction*, Vector<SlowCaseEntry>::iterator&);
 554         void emitSlow_op_bitor(Instruction*, Vector<SlowCaseEntry>::iterator&);
 555         void emitSlow_op_bitxor(Instruction*, Vector<SlowCaseEntry>::iterator&);
 556         void emitSlow_op_call(Instruction*, Vector<SlowCaseEntry>::iterator&);
 557         void emitSlow_op_call_eval(Instruction*, Vector<SlowCaseEntry>::iterator&);
 558         void emitSlow_op_call_varargs(Instruction*, Vector<SlowCaseEntry>::iterator&);
 559         void emitSlow_op_construct_varargs(Instruction*, Vector<SlowCaseEntry>::iterator&);
 560         void emitSlow_op_captured_mov(Instruction*, Vector<SlowCaseEntry>::iterator&);
 561         void emitSlow_op_construct(Instruction*, Vector<SlowCaseEntry>::iterator&);
 562         void emitSlow_op_to_this(Instruction*, Vector<SlowCaseEntry>::iterator&);
 563         void emitSlow_op_create_this(Instruction*, Vector<SlowCaseEntry>::iterator&);
 564         void emitSlow_op_div(Instruction*, Vector<SlowCaseEntry>::iterator&);
 565         void emitSlow_op_eq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 566         void emitSlow_op_get_callee(Instruction*, Vector<SlowCaseEntry>::iterator&);
 567         void emitSlow_op_get_by_id(Instruction*, Vector<SlowCaseEntry>::iterator&);
 568         void emitSlow_op_get_arguments_length(Instruction*, Vector<SlowCaseEntry>::iterator&);
 569         void emitSlow_op_get_by_val(Instruction*, Vector<SlowCaseEntry>::iterator&);
 570         void emitSlow_op_get_argument_by_val(Instruction*, Vector<SlowCaseEntry>::iterator&);
 571         void emitSlow_op_get_by_pname(Instruction*, Vector<SlowCaseEntry>::iterator&);
 572         void emitSlow_op_check_has_instance(Instruction*, Vector<SlowCaseEntry>::iterator&);
 573         void emitSlow_op_instanceof(Instruction*, Vector<SlowCaseEntry>::iterator&);
 574         void emitSlow_op_jfalse(Instruction*, Vector<SlowCaseEntry>::iterator&);
 575         void emitSlow_op_jless(Instruction*, Vector<SlowCaseEntry>::iterator&);
 576         void emitSlow_op_jlesseq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 577         void emitSlow_op_jgreater(Instruction*, Vector<SlowCaseEntry>::iterator&);
 578         void emitSlow_op_jgreatereq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 579         void emitSlow_op_jnless(Instruction*, Vector<SlowCaseEntry>::iterator&);
 580         void emitSlow_op_jnlesseq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 581         void emitSlow_op_jngreater(Instruction*, Vector<SlowCaseEntry>::iterator&);
 582         void emitSlow_op_jngreatereq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 583         void emitSlow_op_jtrue(Instruction*, Vector<SlowCaseEntry>::iterator&);
 584         void emitSlow_op_loop_hint(Instruction*, Vector<SlowCaseEntry>::iterator&);
 585         void emitSlow_op_lshift(Instruction*, Vector<SlowCaseEntry>::iterator&);
 586         void emitSlow_op_mod(Instruction*, Vector<SlowCaseEntry>::iterator&);
 587         void emitSlow_op_mul(Instruction*, Vector<SlowCaseEntry>::iterator&);
 588         void emitSlow_op_negate(Instruction*, Vector<SlowCaseEntry>::iterator&);
 589         void emitSlow_op_neq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 590         void emitSlow_op_new_object(Instruction*, Vector<SlowCaseEntry>::iterator&);
 591         void emitSlow_op_not(Instruction*, Vector<SlowCaseEntry>::iterator&);
 592         void emitSlow_op_nstricteq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 593         void emitSlow_op_dec(Instruction*, Vector<SlowCaseEntry>::iterator&);
 594         void emitSlow_op_inc(Instruction*, Vector<SlowCaseEntry>::iterator&);
 595         void emitSlow_op_put_by_id(Instruction*, Vector<SlowCaseEntry>::iterator&);
 596         void emitSlow_op_put_by_val(Instruction*, Vector<SlowCaseEntry>::iterator&);
 597         void emitSlow_op_rshift(Instruction*, Vector<SlowCaseEntry>::iterator&);
 598         void emitSlow_op_stricteq(Instruction*, Vector<SlowCaseEntry>::iterator&);
 599         void emitSlow_op_sub(Instruction*, Vector<SlowCaseEntry>::iterator&);
 600         void emitSlow_op_to_number(Instruction*, Vector<SlowCaseEntry>::iterator&);
 601         void emitSlow_op_to_primitive(Instruction*, Vector<SlowCaseEntry>::iterator&);
 602         void emitSlow_op_unsigned(Instruction*, Vector<SlowCaseEntry>::iterator&);
 603         void emitSlow_op_urshift(Instruction*, Vector<SlowCaseEntry>::iterator&);
 604
 605         void emit_op_resolve_scope(Instruction*);
 606         void emit_op_get_from_scope(Instruction*);
 607         void emit_op_put_to_scope(Instruction*);
 608         void emitSlow_op_resolve_scope(Instruction*, Vector<SlowCaseEntry>::iterator&);
 609         void emitSlow_op_get_from_scope(Instruction*, Vector<SlowCaseEntry>::iterator&);
 610         void emitSlow_op_put_to_scope(Instruction*, Vector<SlowCaseEntry>::iterator&);
 611
 612         void emitRightShift(Instruction*, bool isUnsigned);
 613         void emitRightShiftSlowCase(Instruction*, Vector<SlowCaseEntry>::iterator&, bool isUnsigned);
 614
 615         void emitVarInjectionCheck(bool needsVarInjectionChecks);
 616         void emitResolveClosure(int dst, bool needsVarInjectionChecks, unsigned depth);
 617         void emitLoadWithStructureCheck(int scope, Structure** structureSlot);
 618         void emitGetGlobalProperty(uintptr_t* operandSlot);
 619         void emitGetGlobalVar(uintptr_t operand);
 620         void emitGetClosureVar(int scope, uintptr_t operand);
 621         void emitPutGlobalProperty(uintptr_t* operandSlot, int value);
 622 #if USE(JSVALUE64)
 623         void emitNotifyWrite(RegisterID value, RegisterID scratch, VariableWatchpointSet*);
 624 #else
 625         void emitNotifyWrite(RegisterID tag, RegisterID payload, RegisterID scratch, VariableWatchpointSet*);
 626 #endif
 627         void emitPutGlobalVar(uintptr_t operand, int value, VariableWatchpointSet*);
 628         void emitPutClosureVar(int scope, uintptr_t operand, int value);
 629
 630         void emitInitRegister(int dst);
 631
 632         void emitPutIntToCallFrameHeader(RegisterID from, JSStack::CallFrameHeaderEntry);
 633         void emitGetFromCallFrameHeaderPtr(JSStack::CallFrameHeaderEntry, RegisterID to, RegisterID from = callFrameRegister);
 634         void emitGetFromCallFrameHeader32(JSStack::CallFrameHeaderEntry, RegisterID to, RegisterID from = callFrameRegister);
 635 #if USE(JSVALUE64)
 636         void emitGetFromCallFrameHeader64(JSStack::CallFrameHeaderEntry, RegisterID to, RegisterID from = callFrameRegister);
 637 #endif
 638
 639         JSValue getConstantOperand(int src);
 640         bool isOperandConstantImmediateInt(int src);
 641         bool isOperandConstantImmediateChar(int src);
 642
 643         Jump getSlowCase(Vector<SlowCaseEntry>::iterator& iter)
 644         {
 645             return iter++->from;
 646         }
 647         void linkSlowCase(Vector<SlowCaseEntry>::iterator& iter)
 648         {
 649             iter->from.link(this);
 650             ++iter;
 651         }
 652         void linkDummySlowCase(Vector<SlowCaseEntry>::iterator& iter)
 653         {
 654             ASSERT(!iter->from.isSet());
 655             ++iter;
 656         }
 657         void linkSlowCaseIfNotJSCell(Vector<SlowCaseEntry>::iterator&, int virtualRegisterIndex);
 658
 659         MacroAssembler::Call appendCallWithExceptionCheck(const FunctionPtr&);
 660 #if OS(WINDOWS) && CPU(X86_64)
 661         MacroAssembler::Call appendCallWithExceptionCheckAndSlowPathReturnType(const FunctionPtr&);
 662 #endif
 663         MacroAssembler::Call appendCallWithCallFrameRollbackOnException(const FunctionPtr&);
 664         MacroAssembler::Call appendCallWithExceptionCheckSetJSValueResult(const FunctionPtr&, int);
 665         MacroAssembler::Call appendCallWithExceptionCheckSetJSValueResultWithProfile(const FunctionPtr&, int);
 666
 667         enum WithProfileTag { WithProfile };
 668
 669         MacroAssembler::Call callOperation(C_JITOperation_E);
 670         MacroAssembler::Call callOperation(C_JITOperation_EO, GPRReg);
 671         MacroAssembler::Call callOperation(C_JITOperation_ESt, Structure*);
 672         MacroAssembler::Call callOperation(C_JITOperation_EZ, int32_t);
 673         MacroAssembler::Call callOperation(F_JITOperation_EJZZ, GPRReg, int32_t, int32_t);
 674         MacroAssembler::Call callOperation(J_JITOperation_E, int);
 675         MacroAssembler::Call callOperation(J_JITOperation_EAapJ, int, ArrayAllocationProfile*, GPRReg);
 676         MacroAssembler::Call callOperation(J_JITOperation_EAapJcpZ, int, ArrayAllocationProfile*, GPRReg, int32_t);
 677         MacroAssembler::Call callOperation(J_JITOperation_EAapJcpZ, int, ArrayAllocationProfile*, const JSValue*, int32_t);
 678         MacroAssembler::Call callOperation(J_JITOperation_EC, int, JSCell*);
 679         MacroAssembler::Call callOperation(V_JITOperation_EC, JSCell*);
 680         MacroAssembler::Call callOperation(J_JITOperation_EJ, int, GPRReg);
 681 #if USE(JSVALUE64)
 682         MacroAssembler::Call callOperation(WithProfileTag, J_JITOperation_ESsiJI, int, StructureStubInfo*, GPRReg, StringImpl*);
 683 #else
 684         MacroAssembler::Call callOperation(WithProfileTag, J_JITOperation_ESsiJI, int, StructureStubInfo*, GPRReg, GPRReg, StringImpl*);
 685 #endif
 686         MacroAssembler::Call callOperation(J_JITOperation_EJIdc, int, GPRReg, const Identifier*);
 687         MacroAssembler::Call callOperation(J_JITOperation_EJJ, int, GPRReg, GPRReg);
 688 #if USE(JSVALUE64)
 689         MacroAssembler::Call callOperation(WithProfileTag, J_JITOperation_EJJ, int, GPRReg, GPRReg);
 690 #else
 691         MacroAssembler::Call callOperation(WithProfileTag, J_JITOperation_EJJ, int, GPRReg, GPRReg, GPRReg, GPRReg);
 692 #endif
 693         MacroAssembler::Call callOperation(J_JITOperation_EP, int, void*);
 694         MacroAssembler::Call callOperation(WithProfileTag, J_JITOperation_EPc, int, Instruction*);
 695         MacroAssembler::Call callOperation(J_JITOperation_EZ, int, int32_t);
 696         MacroAssembler::Call callOperation(P_JITOperation_EJS, GPRReg, size_t);
 697         MacroAssembler::Call callOperation(S_JITOperation_ECC, RegisterID, RegisterID);
 698         MacroAssembler::Call callOperation(S_JITOperation_EJ, RegisterID);
 699         MacroAssembler::Call callOperation(S_JITOperation_EJJ, RegisterID, RegisterID);
 700         MacroAssembler::Call callOperation(S_JITOperation_EOJss, RegisterID, RegisterID);
 701         MacroAssembler::Call callOperation(Sprt_JITOperation_EZ, int32_t);
 702         MacroAssembler::Call callOperation(V_JITOperation_E);
 703         MacroAssembler::Call callOperation(V_JITOperation_EC, RegisterID);
 704         MacroAssembler::Call callOperation(V_JITOperation_ECC, RegisterID, RegisterID);
 705         MacroAssembler::Call callOperation(V_JITOperation_ECICC, RegisterID, const Identifier*, RegisterID, RegisterID);
 706         MacroAssembler::Call callOperation(V_JITOperation_EIdJZ, const Identifier*, RegisterID, int32_t);
 707         MacroAssembler::Call callOperation(V_JITOperation_EJ, RegisterID);
 708 #if USE(JSVALUE64)
 709         MacroAssembler::Call callOperationNoExceptionCheck(V_JITOperation_EJ, RegisterID);
 710 #else
 711         MacroAssembler::Call callOperationNoExceptionCheck(V_JITOperation_EJ, RegisterID, RegisterID);
 712 #endif
 713         MacroAssembler::Call callOperation(V_JITOperation_EJIdJJ, RegisterID, const Identifier*, RegisterID, RegisterID);
 714 #if USE(JSVALUE64)
 715         MacroAssembler::Call callOperation(F_JITOperation_EFJJZ, RegisterID, RegisterID, RegisterID, int32_t);
 716         MacroAssembler::Call callOperation(V_JITOperation_ESsiJJI, StructureStubInfo*, RegisterID, RegisterID, StringImpl*);
 717 #else
 718         MacroAssembler::Call callOperation(V_JITOperation_ESsiJJI, StructureStubInfo*, RegisterID, RegisterID, RegisterID, RegisterID, StringImpl*);
 719 #endif
 720         MacroAssembler::Call callOperation(V_JITOperation_EJJJ, RegisterID, RegisterID, RegisterID);
 721         MacroAssembler::Call callOperation(V_JITOperation_EJZJ, RegisterID, int32_t, RegisterID);
 722         MacroAssembler::Call callOperation(V_JITOperation_EJZ, RegisterID, int32_t);
 723         MacroAssembler::Call callOperation(V_JITOperation_EPc, Instruction*);
 724         MacroAssembler::Call callOperation(V_JITOperation_EZ, int32_t);
 725         MacroAssembler::Call callOperationWithCallFrameRollbackOnException(J_JITOperation_E);
 726         MacroAssembler::Call callOperationNoExceptionCheck(J_JITOperation_EE, RegisterID);
 727         MacroAssembler::Call callOperationWithCallFrameRollbackOnException(V_JITOperation_ECb, CodeBlock*);
 728         MacroAssembler::Call callOperationWithCallFrameRollbackOnException(Z_JITOperation_E);
 729 #if USE(JSVALUE32_64)
 730         MacroAssembler::Call callOperation(F_JITOperation_EFJJZ, RegisterID, RegisterID, RegisterID, RegisterID, RegisterID, int32_t);
 731         MacroAssembler::Call callOperation(F_JITOperation_EJZZ, GPRReg, GPRReg, int32_t, int32_t);
 732         MacroAssembler::Call callOperation(J_JITOperation_EAapJ, int, ArrayAllocationProfile*, GPRReg, GPRReg);
 733         MacroAssembler::Call callOperation(J_JITOperation_EJ, int, GPRReg, GPRReg);
 734         MacroAssembler::Call callOperation(J_JITOperation_EJIdc, int, GPRReg, GPRReg, const Identifier*);
 735         MacroAssembler::Call callOperation(J_JITOperation_EJJ, int, GPRReg, GPRReg, GPRReg, GPRReg);
 736         MacroAssembler::Call callOperation(P_JITOperation_EJS, GPRReg, GPRReg, size_t);
 737         MacroAssembler::Call callOperation(S_JITOperation_EJ, RegisterID, RegisterID);
 738         MacroAssembler::Call callOperation(S_JITOperation_EJJ, RegisterID, RegisterID, RegisterID, RegisterID);
 739         MacroAssembler::Call callOperation(V_JITOperation_EIdJZ, const Identifier*, RegisterID, RegisterID, int32_t);
 740         MacroAssembler::Call callOperation(V_JITOperation_EJ, RegisterID, RegisterID);
 741         MacroAssembler::Call callOperation(V_JITOperation_EJJJ, RegisterID, RegisterID, RegisterID, RegisterID, RegisterID, RegisterID);
 742         MacroAssembler::Call callOperation(V_JITOperation_EJZ, RegisterID, RegisterID, int32_t);
 743         MacroAssembler::Call callOperation(V_JITOperation_EJZJ, RegisterID, RegisterID, int32_t, RegisterID, RegisterID);
 744 #endif
 745
 746         Jump checkStructure(RegisterID reg, Structure* structure);
 747
 748         void updateTopCallFrame();
 749
 750         Call emitNakedCall(CodePtr function = CodePtr());
 751
 752         // Loads the character value of a single character string into dst.
 753         void emitLoadCharacterString(RegisterID src, RegisterID dst, JumpList& failures);
 754
 755 #if ENABLE(DFG_JIT)
 756         void emitEnterOptimizationCheck();
 757 #else
 758         void emitEnterOptimizationCheck() { }
 759 #endif
 760
 761 #ifndef NDEBUG
 762         void printBytecodeOperandTypes(int src1, int src2);
 763 #endif
 764
 765 #if ENABLE(SAMPLING_FLAGS)
 766         void setSamplingFlag(int32_t);
 767         void clearSamplingFlag(int32_t);
 768 #endif
 769
 770 #if ENABLE(SAMPLING_COUNTERS)
 771         void emitCount(AbstractSamplingCounter&, int32_t = 1);
 772 #endif
 773
 774 #if ENABLE(OPCODE_SAMPLING)
 775         void sampleInstruction(Instruction*, bool = false);
 776 #endif
 777
 778 #if ENABLE(CODEBLOCK_SAMPLING)
 779         void sampleCodeBlock(CodeBlock*);
 780 #else
 781         void sampleCodeBlock(CodeBlock*) {}
 782 #endif
 783
 784 #if ENABLE(DFG_JIT)
 785         bool canBeOptimized() { return m_canBeOptimized; }
 786         bool canBeOptimizedOrInlined() { return m_canBeOptimizedOrInlined; }
 787         bool shouldEmitProfiling() { return m_shouldEmitProfiling; }
 788 #else
 789         bool canBeOptimized() { return false; }
 790         bool canBeOptimizedOrInlined() { return false; }
 791         // Enables use of value profiler with tiered compilation turned off,
 792         // in which case all code gets profiled.
 793         bool shouldEmitProfiling() { return false; }
 794 #endif
 795
 796         Interpreter* m_interpreter;
 797
 798         Vector<CallRecord> m_calls;
 799         Vector<Label> m_labels;
 800         Vector<JITGetByIdGenerator> m_getByIds;
 801         Vector<JITPutByIdGenerator> m_putByIds;
 802         Vector<ByValCompilationInfo> m_byValCompilationInfo;
 803         Vector<CallCompilationInfo> m_callCompilationInfo;
 804         Vector<JumpTable> m_jmpTable;
 805
 806         unsigned m_bytecodeOffset;
 807         Vector<SlowCaseEntry> m_slowCases;
 808         Vector<SwitchRecord> m_switches;
 809
 810         JumpList m_exceptionChecks;
 811         JumpList m_exceptionChecksWithCallFrameRollback;
 812
 813         unsigned m_getByIdIndex;
 814         unsigned m_putByIdIndex;
 815         unsigned m_byValInstructionIndex;
 816         unsigned m_callLinkInfoIndex;
 817
 818         OwnPtr<JITDisassembler> m_disassembler;
 819         RefPtr<Profiler::Compilation> m_compilation;
 820         WeakRandom m_randomGenerator;
 821         static CodeRef stringGetByValStubGenerator(VM*);
 822
 823         bool m_canBeOptimized;
 824         bool m_canBeOptimizedOrInlined;
 825         bool m_shouldEmitProfiling;
 826     } JIT_CLASS_ALIGNMENT;
 827
 828 } // namespace JSC
 829
 830 #endif // ENABLE(JIT)
 831
 832 #endif // JIT_h