bytecode/CodeBlock.h

   1 /*
   2  * Copyright (C) 2008, 2009, 2010 Apple Inc. All rights reserved.
   3  * Copyright (C) 2008 Cameron Zwarich <cwzwarich@uwaterloo.ca>
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1.  Redistributions of source code must retain the above copyright
  10  *     notice, this list of conditions and the following disclaimer.
  11  * 2.  Redistributions in binary form must reproduce the above copyright
  12  *     notice, this list of conditions and the following disclaimer in the
  13  *     documentation and/or other materials provided with the distribution.
  14  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
  15  *     its contributors may be used to endorse or promote products derived
  16  *     from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  19  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  21  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  22  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  24  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  25  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #ifndef CodeBlock_h
  31 #define CodeBlock_h
  32
  33 #include "EvalCodeCache.h"
  34 #include "Instruction.h"
  35 #include "JITCode.h"
  36 #include "JITWriteBarrier.h"
  37 #include "JSGlobalObject.h"
  38 #include "JumpTable.h"
  39 #include "Nodes.h"
  40 #include "RegExpObject.h"
  41 #include "UString.h"
  42 #include <wtf/FastAllocBase.h>
  43 #include <wtf/PassOwnPtr.h>
  44 #include <wtf/RefPtr.h>
  45 #include <wtf/Vector.h>
  46
  47 #if ENABLE(JIT)
  48 #include "StructureStubInfo.h"
  49 #endif
  50
  51 // Register numbers used in bytecode operations have different meaning according to their ranges:
  52 //      0x80000000-0xFFFFFFFF  Negative indices from the CallFrame pointer are entries in the call frame, see RegisterFile.h.
  53 //      0x00000000-0x3FFFFFFF  Forwards indices from the CallFrame pointer are local vars and temporaries with the function's callframe.
  54 //      0x40000000-0x7FFFFFFF  Positive indices from 0x40000000 specify entries in the constant pool on the CodeBlock.
  55 static const int FirstConstantRegisterIndex = 0x40000000;
  56
  57 namespace JSC {
  58
  59     enum HasSeenShouldRepatch {
  60         hasSeenShouldRepatch
  61     };
  62
  63     class ExecState;
  64
  65     enum CodeType { GlobalCode, EvalCode, FunctionCode };
  66
  67     inline int unmodifiedArgumentsRegister(int argumentsRegister) { return argumentsRegister - 1; }
  68
  69     static ALWAYS_INLINE int missingThisObjectMarker() { return std::numeric_limits<int>::max(); }
  70
  71     struct HandlerInfo {
  72         uint32_t start;
  73         uint32_t end;
  74         uint32_t target;
  75         uint32_t scopeDepth;
  76 #if ENABLE(JIT)
  77         CodeLocationLabel nativeCode;
  78 #endif
  79     };
  80
  81     struct ExpressionRangeInfo {
  82         enum {
  83             MaxOffset = (1 << 7) - 1,
  84             MaxDivot = (1 << 25) - 1
  85         };
  86         uint32_t instructionOffset : 25;
  87         uint32_t divotPoint : 25;
  88         uint32_t startOffset : 7;
  89         uint32_t endOffset : 7;
  90     };
  91
  92     struct LineInfo {
  93         uint32_t instructionOffset;
  94         int32_t lineNumber;
  95     };
  96
  97 #if ENABLE(JIT)
  98     struct CallLinkInfo {
  99         CallLinkInfo()
 100             : hasSeenShouldRepatch(false)
 101             , isCall(false)
 102         {
 103         }
 104
 105         CodeLocationNearCall callReturnLocation;
 106         CodeLocationDataLabelPtr hotPathBegin;
 107         CodeLocationNearCall hotPathOther;
 108         JITWriteBarrier<JSFunction> callee;
 109         bool hasSeenShouldRepatch : 1;
 110         bool isCall : 1;
 111
 112         bool isLinked() { return callee; }
 113         void unlink()
 114         {
 115             hasSeenShouldRepatch = false;
 116             callee.clear();
 117         }
 118
 119         bool seenOnce()
 120         {
 121             return hasSeenShouldRepatch;
 122         }
 123
 124         void setSeen()
 125         {
 126             hasSeenShouldRepatch = true;
 127         }
 128     };
 129
 130     struct MethodCallLinkInfo {
 131         MethodCallLinkInfo()
 132         {
 133         }
 134
 135         bool seenOnce()
 136         {
 137             ASSERT(!cachedStructure);
 138             return cachedPrototypeStructure.isFlagged();
 139         }
 140
 141         void setSeen()
 142         {
 143             ASSERT(!cachedStructure && !cachedPrototypeStructure);
 144             // We use the values of cachedStructure & cachedPrototypeStructure to indicate the
 145             // current state.
 146             //     - In the initial state, both are null.
 147             //     - Once this transition has been taken once, cachedStructure is
 148             //       null and cachedPrototypeStructure is set to a nun-null value.
 149             //     - Once the call is linked both structures are set to non-null values.
 150             cachedPrototypeStructure.setFlagOnBarrier();
 151         }
 152
 153         CodeLocationCall callReturnLocation;
 154         JITWriteBarrier<Structure> cachedStructure;
 155         JITWriteBarrier<Structure> cachedPrototypeStructure;
 156         // We'd like this to actually be JSFunction, but InternalFunction and JSFunction
 157         // don't have a common parent class and we allow specialisation on both
 158         JITWriteBarrier<JSObjectWithGlobalObject> cachedFunction;
 159         JITWriteBarrier<JSObject> cachedPrototype;
 160     };
 161
 162     struct GlobalResolveInfo {
 163         GlobalResolveInfo(unsigned bytecodeOffset)
 164             : offset(0)
 165             , bytecodeOffset(bytecodeOffset)
 166         {
 167         }
 168
 169         WriteBarrier<Structure> structure;
 170         unsigned offset;
 171         unsigned bytecodeOffset;
 172     };
 173
 174     // This structure is used to map from a call return location
 175     // (given as an offset in bytes into the JIT code) back to
 176     // the bytecode index of the corresponding bytecode operation.
 177     // This is then used to look up the corresponding handler.
 178     struct CallReturnOffsetToBytecodeOffset {
 179         CallReturnOffsetToBytecodeOffset(unsigned callReturnOffset, unsigned bytecodeOffset)
 180             : callReturnOffset(callReturnOffset)
 181             , bytecodeOffset(bytecodeOffset)
 182         {
 183         }
 184
 185         unsigned callReturnOffset;
 186         unsigned bytecodeOffset;
 187     };
 188
 189     // valueAtPosition helpers for the binarySearch algorithm.
 190
 191     inline void* getStructureStubInfoReturnLocation(StructureStubInfo* structureStubInfo)
 192     {
 193         return structureStubInfo->callReturnLocation.executableAddress();
 194     }
 195
 196     inline void* getCallLinkInfoReturnLocation(CallLinkInfo* callLinkInfo)
 197     {
 198         return callLinkInfo->callReturnLocation.executableAddress();
 199     }
 200
 201     inline void* getMethodCallLinkInfoReturnLocation(MethodCallLinkInfo* methodCallLinkInfo)
 202     {
 203         return methodCallLinkInfo->callReturnLocation.executableAddress();
 204     }
 205
 206     inline unsigned getCallReturnOffset(CallReturnOffsetToBytecodeOffset* pc)
 207     {
 208         return pc->callReturnOffset;
 209     }
 210 #endif
 211
 212     class CodeBlock {
 213         WTF_MAKE_FAST_ALLOCATED;
 214         friend class JIT;
 215     protected:
 216         CodeBlock(ScriptExecutable* ownerExecutable, CodeType, JSGlobalObject*, PassRefPtr<SourceProvider>, unsigned sourceOffset, SymbolTable* symbolTable, bool isConstructor);
 217
 218         WriteBarrier<JSGlobalObject> m_globalObject;
 219         Heap* m_heap;
 220
 221     public:
 222         virtual ~CodeBlock();
 223
 224         void visitAggregate(SlotVisitor&);
 225
 226         static void dumpStatistics();
 227
 228 #if !defined(NDEBUG) || ENABLE_OPCODE_SAMPLING
 229         void dump(ExecState*) const;
 230         void printStructures(const Instruction*) const;
 231         void printStructure(const char* name, const Instruction*, int operand) const;
 232 #endif
 233
 234         bool isStrictMode() const { return m_isStrictMode; }
 235
 236         inline bool isKnownNotImmediate(int index)
 237         {
 238             if (index == m_thisRegister && !m_isStrictMode)
 239                 return true;
 240
 241             if (isConstantRegisterIndex(index))
 242                 return getConstant(index).isCell();
 243
 244             return false;
 245         }
 246
 247         ALWAYS_INLINE bool isTemporaryRegisterIndex(int index)
 248         {
 249             return index >= m_numVars;
 250         }
 251
 252         HandlerInfo* handlerForBytecodeOffset(unsigned bytecodeOffset);
 253         int lineNumberForBytecodeOffset(unsigned bytecodeOffset);
 254         void expressionRangeForBytecodeOffset(unsigned bytecodeOffset, int& divot, int& startOffset, int& endOffset);
 255
 256 #if ENABLE(JIT)
 257
 258         StructureStubInfo& getStubInfo(ReturnAddressPtr returnAddress)
 259         {
 260             return *(binarySearch<StructureStubInfo, void*, getStructureStubInfoReturnLocation>(m_structureStubInfos.begin(), m_structureStubInfos.size(), returnAddress.value()));
 261         }
 262
 263         CallLinkInfo& getCallLinkInfo(ReturnAddressPtr returnAddress)
 264         {
 265             return *(binarySearch<CallLinkInfo, void*, getCallLinkInfoReturnLocation>(m_callLinkInfos.begin(), m_callLinkInfos.size(), returnAddress.value()));
 266         }
 267
 268         MethodCallLinkInfo& getMethodCallLinkInfo(ReturnAddressPtr returnAddress)
 269         {
 270             return *(binarySearch<MethodCallLinkInfo, void*, getMethodCallLinkInfoReturnLocation>(m_methodCallLinkInfos.begin(), m_methodCallLinkInfos.size(), returnAddress.value()));
 271         }
 272
 273         unsigned bytecodeOffset(ReturnAddressPtr returnAddress)
 274         {
 275             if (!m_rareData)
 276                 return 1;
 277             Vector<CallReturnOffsetToBytecodeOffset>& callIndices = m_rareData->m_callReturnIndexVector;
 278             if (!callIndices.size())
 279                 return 1;
 280             return binarySearch<CallReturnOffsetToBytecodeOffset, unsigned, getCallReturnOffset>(callIndices.begin(), callIndices.size(), getJITCode().offsetOf(returnAddress.value()))->bytecodeOffset;
 281         }
 282
 283         void unlinkCalls();
 284 #endif
 285
 286 #if ENABLE(INTERPRETER)
 287         unsigned bytecodeOffset(Instruction* returnAddress)
 288         {
 289             return static_cast<Instruction*>(returnAddress) - instructions().begin();
 290         }
 291 #endif
 292
 293         void setIsNumericCompareFunction(bool isNumericCompareFunction) { m_isNumericCompareFunction = isNumericCompareFunction; }
 294         bool isNumericCompareFunction() { return m_isNumericCompareFunction; }
 295
 296         Vector<Instruction>& instructions() { return m_instructions; }
 297         void discardBytecode() { m_instructions.clear(); }
 298
 299 #ifndef NDEBUG
 300         unsigned instructionCount() { return m_instructionCount; }
 301         void setInstructionCount(unsigned instructionCount) { m_instructionCount = instructionCount; }
 302 #endif
 303
 304 #if ENABLE(JIT)
 305         JITCode& getJITCode() { return m_isConstructor ? ownerExecutable()->generatedJITCodeForConstruct() : ownerExecutable()->generatedJITCodeForCall(); }
 306         ExecutablePool* executablePool() { return getJITCode().getExecutablePool(); }
 307 #endif
 308
 309         ScriptExecutable* ownerExecutable() const { return m_ownerExecutable.get(); }
 310
 311         void setGlobalData(JSGlobalData* globalData) { m_globalData = globalData; }
 312
 313         void setThisRegister(int thisRegister) { m_thisRegister = thisRegister; }
 314         int thisRegister() const { return m_thisRegister; }
 315
 316         void setNeedsFullScopeChain(bool needsFullScopeChain) { m_needsFullScopeChain = needsFullScopeChain; }
 317         bool needsFullScopeChain() const { return m_needsFullScopeChain; }
 318         void setUsesEval(bool usesEval) { m_usesEval = usesEval; }
 319         bool usesEval() const { return m_usesEval; }
 320
 321         void setArgumentsRegister(int argumentsRegister)
 322         {
 323             ASSERT(argumentsRegister != -1);
 324             m_argumentsRegister = argumentsRegister;
 325             ASSERT(usesArguments());
 326         }
 327         int argumentsRegister()
 328         {
 329             ASSERT(usesArguments());
 330             return m_argumentsRegister;
 331         }
 332         void setActivationRegister(int activationRegister)
 333         {
 334             m_activationRegister = activationRegister;
 335         }
 336         int activationRegister()
 337         {
 338             ASSERT(needsFullScopeChain());
 339             return m_activationRegister;
 340         }
 341         bool usesArguments() const { return m_argumentsRegister != -1; }
 342
 343         CodeType codeType() const { return m_codeType; }
 344
 345         SourceProvider* source() const { return m_source.get(); }
 346         unsigned sourceOffset() const { return m_sourceOffset; }
 347
 348         size_t numberOfJumpTargets() const { return m_jumpTargets.size(); }
 349         void addJumpTarget(unsigned jumpTarget) { m_jumpTargets.append(jumpTarget); }
 350         unsigned jumpTarget(int index) const { return m_jumpTargets[index]; }
 351         unsigned lastJumpTarget() const { return m_jumpTargets.last(); }
 352
 353         void createActivation(CallFrame*);
 354
 355         void clearEvalCache();
 356
 357 #if ENABLE(INTERPRETER)
 358         void addPropertyAccessInstruction(unsigned propertyAccessInstruction)
 359         {
 360             if (!m_globalData->canUseJIT())
 361                 m_propertyAccessInstructions.append(propertyAccessInstruction);
 362         }
 363         void addGlobalResolveInstruction(unsigned globalResolveInstruction)
 364         {
 365             if (!m_globalData->canUseJIT())
 366                 m_globalResolveInstructions.append(globalResolveInstruction);
 367         }
 368         bool hasGlobalResolveInstructionAtBytecodeOffset(unsigned bytecodeOffset);
 369 #endif
 370 #if ENABLE(JIT)
 371         size_t numberOfStructureStubInfos() const { return m_structureStubInfos.size(); }
 372         void addStructureStubInfo(const StructureStubInfo& stubInfo)
 373         {
 374             if (m_globalData->canUseJIT())
 375                 m_structureStubInfos.append(stubInfo);
 376         }
 377         StructureStubInfo& structureStubInfo(int index) { return m_structureStubInfos[index]; }
 378
 379         void addGlobalResolveInfo(unsigned globalResolveInstruction)
 380         {
 381             if (m_globalData->canUseJIT())
 382                 m_globalResolveInfos.append(GlobalResolveInfo(globalResolveInstruction));
 383         }
 384         GlobalResolveInfo& globalResolveInfo(int index) { return m_globalResolveInfos[index]; }
 385         bool hasGlobalResolveInfoAtBytecodeOffset(unsigned bytecodeOffset);
 386
 387         size_t numberOfCallLinkInfos() const { return m_callLinkInfos.size(); }
 388         void addCallLinkInfo() { m_callLinkInfos.append(CallLinkInfo()); }
 389         CallLinkInfo& callLinkInfo(int index) { return m_callLinkInfos[index]; }
 390
 391         void addMethodCallLinkInfos(unsigned n) { ASSERT(m_globalData->canUseJIT()); m_methodCallLinkInfos.grow(n); }
 392         MethodCallLinkInfo& methodCallLinkInfo(int index) { return m_methodCallLinkInfos[index]; }
 393 #endif
 394         unsigned globalResolveInfoCount() const
 395         {
 396 #if ENABLE(JIT)
 397             if (m_globalData->canUseJIT())
 398                 return m_globalResolveInfos.size();
 399 #endif
 400             return 0;
 401         }
 402
 403         // Exception handling support
 404
 405         size_t numberOfExceptionHandlers() const { return m_rareData ? m_rareData->m_exceptionHandlers.size() : 0; }
 406         void addExceptionHandler(const HandlerInfo& hanler) { createRareDataIfNecessary(); return m_rareData->m_exceptionHandlers.append(hanler); }
 407         HandlerInfo& exceptionHandler(int index) { ASSERT(m_rareData); return m_rareData->m_exceptionHandlers[index]; }
 408
 409         void addExpressionInfo(const ExpressionRangeInfo& expressionInfo)
 410         {
 411             createRareDataIfNecessary();
 412             m_rareData->m_expressionInfo.append(expressionInfo);
 413         }
 414
 415         void addLineInfo(unsigned bytecodeOffset, int lineNo)
 416         {
 417             createRareDataIfNecessary();
 418             Vector<LineInfo>& lineInfo = m_rareData->m_lineInfo;
 419             if (!lineInfo.size() || lineInfo.last().lineNumber != lineNo) {
 420                 LineInfo info = { bytecodeOffset, lineNo };
 421                 lineInfo.append(info);
 422             }
 423         }
 424
 425         bool hasExpressionInfo() { return m_rareData && m_rareData->m_expressionInfo.size(); }
 426         bool hasLineInfo() { return m_rareData && m_rareData->m_lineInfo.size(); }
 427         //  We only generate exception handling info if the user is debugging
 428         // (and may want line number info), or if the function contains exception handler.
 429         bool needsCallReturnIndices()
 430         {
 431             return m_rareData &&
 432                 (m_rareData->m_expressionInfo.size() || m_rareData->m_lineInfo.size() || m_rareData->m_exceptionHandlers.size());
 433         }
 434
 435 #if ENABLE(JIT)
 436         Vector<CallReturnOffsetToBytecodeOffset>& callReturnIndexVector()
 437         {
 438             createRareDataIfNecessary();
 439             return m_rareData->m_callReturnIndexVector;
 440         }
 441 #endif
 442
 443         // Constant Pool
 444
 445         size_t numberOfIdentifiers() const { return m_identifiers.size(); }
 446         void addIdentifier(const Identifier& i) { return m_identifiers.append(i); }
 447         Identifier& identifier(int index) { return m_identifiers[index]; }
 448
 449         size_t numberOfConstantRegisters() const { return m_constantRegisters.size(); }
 450         void addConstant(JSValue v)
 451         {
 452             m_constantRegisters.append(WriteBarrier<Unknown>());
 453             m_constantRegisters.last().set(m_globalObject->globalData(), m_ownerExecutable.get(), v);
 454         }
 455         WriteBarrier<Unknown>& constantRegister(int index) { return m_constantRegisters[index - FirstConstantRegisterIndex]; }
 456         ALWAYS_INLINE bool isConstantRegisterIndex(int index) const { return index >= FirstConstantRegisterIndex; }
 457         ALWAYS_INLINE JSValue getConstant(int index) const { return m_constantRegisters[index - FirstConstantRegisterIndex].get(); }
 458
 459         unsigned addFunctionDecl(FunctionExecutable* n)
 460         {
 461             unsigned size = m_functionDecls.size();
 462             m_functionDecls.append(WriteBarrier<FunctionExecutable>());
 463             m_functionDecls.last().set(m_globalObject->globalData(), m_ownerExecutable.get(), n);
 464             return size;
 465         }
 466         FunctionExecutable* functionDecl(int index) { return m_functionDecls[index].get(); }
 467         int numberOfFunctionDecls() { return m_functionDecls.size(); }
 468         unsigned addFunctionExpr(FunctionExecutable* n)
 469         {
 470             unsigned size = m_functionExprs.size();
 471             m_functionExprs.append(WriteBarrier<FunctionExecutable>());
 472             m_functionExprs.last().set(m_globalObject->globalData(), m_ownerExecutable.get(), n);
 473             return size;
 474         }
 475         FunctionExecutable* functionExpr(int index) { return m_functionExprs[index].get(); }
 476
 477         unsigned addRegExp(RegExp* r)
 478         {
 479             createRareDataIfNecessary();
 480             unsigned size = m_rareData->m_regexps.size();
 481             m_rareData->m_regexps.append(WriteBarrier<RegExp>(*m_globalData, ownerExecutable(), r));
 482             return size;
 483         }
 484         RegExp* regexp(int index) const { ASSERT(m_rareData); return m_rareData->m_regexps[index].get(); }
 485
 486         unsigned addConstantBuffer(unsigned length)
 487         {
 488             createRareDataIfNecessary();
 489             unsigned size = m_rareData->m_constantBuffers.size();
 490             m_rareData->m_constantBuffers.append(Vector<JSValue>(length));
 491             return size;
 492         }
 493
 494         JSValue* constantBuffer(unsigned index)
 495         {
 496             ASSERT(m_rareData);
 497             return m_rareData->m_constantBuffers[index].data();
 498         }
 499
 500         JSGlobalObject* globalObject() { return m_globalObject.get(); }
 501
 502         // Jump Tables
 503
 504         size_t numberOfImmediateSwitchJumpTables() const { return m_rareData ? m_rareData->m_immediateSwitchJumpTables.size() : 0; }
 505         SimpleJumpTable& addImmediateSwitchJumpTable() { createRareDataIfNecessary(); m_rareData->m_immediateSwitchJumpTables.append(SimpleJumpTable()); return m_rareData->m_immediateSwitchJumpTables.last(); }
 506         SimpleJumpTable& immediateSwitchJumpTable(int tableIndex) { ASSERT(m_rareData); return m_rareData->m_immediateSwitchJumpTables[tableIndex]; }
 507
 508         size_t numberOfCharacterSwitchJumpTables() const { return m_rareData ? m_rareData->m_characterSwitchJumpTables.size() : 0; }
 509         SimpleJumpTable& addCharacterSwitchJumpTable() { createRareDataIfNecessary(); m_rareData->m_characterSwitchJumpTables.append(SimpleJumpTable()); return m_rareData->m_characterSwitchJumpTables.last(); }
 510         SimpleJumpTable& characterSwitchJumpTable(int tableIndex) { ASSERT(m_rareData); return m_rareData->m_characterSwitchJumpTables[tableIndex]; }
 511
 512         size_t numberOfStringSwitchJumpTables() const { return m_rareData ? m_rareData->m_stringSwitchJumpTables.size() : 0; }
 513         StringJumpTable& addStringSwitchJumpTable() { createRareDataIfNecessary(); m_rareData->m_stringSwitchJumpTables.append(StringJumpTable()); return m_rareData->m_stringSwitchJumpTables.last(); }
 514         StringJumpTable& stringSwitchJumpTable(int tableIndex) { ASSERT(m_rareData); return m_rareData->m_stringSwitchJumpTables[tableIndex]; }
 515
 516
 517         SymbolTable* symbolTable() { return m_symbolTable; }
 518         SharedSymbolTable* sharedSymbolTable() { ASSERT(m_codeType == FunctionCode); return static_cast<SharedSymbolTable*>(m_symbolTable); }
 519
 520         EvalCodeCache& evalCodeCache() { createRareDataIfNecessary(); return m_rareData->m_evalCodeCache; }
 521
 522         void shrinkToFit();
 523
 524         // FIXME: Make these remaining members private.
 525
 526         int m_numCalleeRegisters;
 527         int m_numVars;
 528         int m_numCapturedVars;
 529         int m_numParameters;
 530         bool m_isConstructor;
 531
 532     private:
 533 #if !defined(NDEBUG) || ENABLE(OPCODE_SAMPLING)
 534         void dump(ExecState*, const Vector<Instruction>::const_iterator& begin, Vector<Instruction>::const_iterator&) const;
 535
 536         CString registerName(ExecState*, int r) const;
 537         void printUnaryOp(ExecState*, int location, Vector<Instruction>::const_iterator&, const char* op) const;
 538         void printBinaryOp(ExecState*, int location, Vector<Instruction>::const_iterator&, const char* op) const;
 539         void printConditionalJump(ExecState*, const Vector<Instruction>::const_iterator&, Vector<Instruction>::const_iterator&, int location, const char* op) const;
 540         void printGetByIdOp(ExecState*, int location, Vector<Instruction>::const_iterator&, const char* op) const;
 541         void printPutByIdOp(ExecState*, int location, Vector<Instruction>::const_iterator&, const char* op) const;
 542 #endif
 543         void visitStructures(SlotVisitor&, Instruction* vPC) const;
 544
 545         void createRareDataIfNecessary()
 546         {
 547             if (!m_rareData)
 548                 m_rareData = adoptPtr(new RareData);
 549         }
 550
 551         WriteBarrier<ScriptExecutable> m_ownerExecutable;
 552         JSGlobalData* m_globalData;
 553
 554         Vector<Instruction> m_instructions;
 555 #ifndef NDEBUG
 556         unsigned m_instructionCount;
 557 #endif
 558
 559         int m_thisRegister;
 560         int m_argumentsRegister;
 561         int m_activationRegister;
 562
 563         bool m_needsFullScopeChain;
 564         bool m_usesEval;
 565         bool m_isNumericCompareFunction;
 566         bool m_isStrictMode;
 567
 568         CodeType m_codeType;
 569
 570         RefPtr<SourceProvider> m_source;
 571         unsigned m_sourceOffset;
 572
 573 #if ENABLE(INTERPRETER)
 574         Vector<unsigned> m_propertyAccessInstructions;
 575         Vector<unsigned> m_globalResolveInstructions;
 576 #endif
 577 #if ENABLE(JIT)
 578         Vector<StructureStubInfo> m_structureStubInfos;
 579         Vector<GlobalResolveInfo> m_globalResolveInfos;
 580         Vector<CallLinkInfo> m_callLinkInfos;
 581         Vector<MethodCallLinkInfo> m_methodCallLinkInfos;
 582 #endif
 583
 584         Vector<unsigned> m_jumpTargets;
 585
 586         // Constant Pool
 587         Vector<Identifier> m_identifiers;
 588         COMPILE_ASSERT(sizeof(Register) == sizeof(WriteBarrier<Unknown>), Register_must_be_same_size_as_WriteBarrier_Unknown);
 589         Vector<WriteBarrier<Unknown> > m_constantRegisters;
 590         Vector<WriteBarrier<FunctionExecutable> > m_functionDecls;
 591         Vector<WriteBarrier<FunctionExecutable> > m_functionExprs;
 592
 593         SymbolTable* m_symbolTable;
 594
 595         struct RareData {
 596            WTF_MAKE_FAST_ALLOCATED;
 597         public:
 598             Vector<HandlerInfo> m_exceptionHandlers;
 599
 600             // Rare Constants
 601             Vector<WriteBarrier<RegExp> > m_regexps;
 602
 603             // Buffers used for large array literals
 604             Vector<Vector<JSValue> > m_constantBuffers;
 605
 606             // Jump Tables
 607             Vector<SimpleJumpTable> m_immediateSwitchJumpTables;
 608             Vector<SimpleJumpTable> m_characterSwitchJumpTables;
 609             Vector<StringJumpTable> m_stringSwitchJumpTables;
 610
 611             EvalCodeCache m_evalCodeCache;
 612
 613             // Expression info - present if debugging.
 614             Vector<ExpressionRangeInfo> m_expressionInfo;
 615             // Line info - present if profiling or debugging.
 616             Vector<LineInfo> m_lineInfo;
 617 #if ENABLE(JIT)
 618             Vector<CallReturnOffsetToBytecodeOffset> m_callReturnIndexVector;
 619 #endif
 620         };
 621 #if COMPILER(MSVC)
 622         friend void WTF::deleteOwnedPtr<RareData>(RareData*);
 623 #endif
 624         OwnPtr<RareData> m_rareData;
 625     };
 626
 627     // Program code is not marked by any function, so we make the global object
 628     // responsible for marking it.
 629
 630     class GlobalCodeBlock : public CodeBlock {
 631     public:
 632         GlobalCodeBlock(ScriptExecutable* ownerExecutable, CodeType codeType, JSGlobalObject* globalObject, PassRefPtr<SourceProvider> sourceProvider, unsigned sourceOffset)
 633             : CodeBlock(ownerExecutable, codeType, globalObject, sourceProvider, sourceOffset, &m_unsharedSymbolTable, false)
 634         {
 635         }
 636
 637     private:
 638         SymbolTable m_unsharedSymbolTable;
 639     };
 640
 641     class ProgramCodeBlock : public GlobalCodeBlock {
 642     public:
 643         ProgramCodeBlock(ProgramExecutable* ownerExecutable, CodeType codeType, JSGlobalObject* globalObject, PassRefPtr<SourceProvider> sourceProvider)
 644             : GlobalCodeBlock(ownerExecutable, codeType, globalObject, sourceProvider, 0)
 645         {
 646         }
 647     };
 648
 649     class EvalCodeBlock : public GlobalCodeBlock {
 650     public:
 651         EvalCodeBlock(EvalExecutable* ownerExecutable, JSGlobalObject* globalObject, PassRefPtr<SourceProvider> sourceProvider, int baseScopeDepth)
 652             : GlobalCodeBlock(ownerExecutable, EvalCode, globalObject, sourceProvider, 0)
 653             , m_baseScopeDepth(baseScopeDepth)
 654         {
 655         }
 656
 657         int baseScopeDepth() const { return m_baseScopeDepth; }
 658
 659         const Identifier& variable(unsigned index) { return m_variables[index]; }
 660         unsigned numVariables() { return m_variables.size(); }
 661         void adoptVariables(Vector<Identifier>& variables)
 662         {
 663             ASSERT(m_variables.isEmpty());
 664             m_variables.swap(variables);
 665         }
 666
 667     private:
 668         int m_baseScopeDepth;
 669         Vector<Identifier> m_variables;
 670     };
 671
 672     class FunctionCodeBlock : public CodeBlock {
 673     public:
 674         // Rather than using the usual RefCounted::create idiom for SharedSymbolTable we just use new
 675         // as we need to initialise the CodeBlock before we could initialise any RefPtr to hold the shared
 676         // symbol table, so we just pass as a raw pointer with a ref count of 1.  We then manually deref
 677         // in the destructor.
 678         FunctionCodeBlock(FunctionExecutable* ownerExecutable, CodeType codeType, JSGlobalObject* globalObject, PassRefPtr<SourceProvider> sourceProvider, unsigned sourceOffset, bool isConstructor)
 679             : CodeBlock(ownerExecutable, codeType, globalObject, sourceProvider, sourceOffset, SharedSymbolTable::create().leakRef(), isConstructor)
 680         {
 681         }
 682         ~FunctionCodeBlock()
 683         {
 684             sharedSymbolTable()->deref();
 685         }
 686     };
 687
 688     inline Register& ExecState::r(int index)
 689     {
 690         CodeBlock* codeBlock = this->codeBlock();
 691         if (codeBlock->isConstantRegisterIndex(index))
 692             return *reinterpret_cast<Register*>(&codeBlock->constantRegister(index));
 693         return this[index];
 694     }
 695
 696     inline Register& ExecState::uncheckedR(int index)
 697     {
 698         ASSERT(index < FirstConstantRegisterIndex);
 699         return this[index];
 700     }
 701
 702 } // namespace JSC
 703
 704 #endif // CodeBlock_h