diff -r 000000000000 -r 1918ee327afb src/3rdparty/webkit/JavaScriptCore/bytecode/CodeBlock.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/3rdparty/webkit/JavaScriptCore/bytecode/CodeBlock.h	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,640 @@
+/*
+ * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
+ * Copyright (C) 2008 Cameron Zwarich <cwzwarich@uwaterloo.ca>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef CodeBlock_h
+#define CodeBlock_h
+
+#include "EvalCodeCache.h"
+#include "Instruction.h"
+#include "JITCode.h"
+#include "JSGlobalObject.h"
+#include "JumpTable.h"
+#include "Nodes.h"
+#include "PtrAndFlags.h"
+#include "RegExp.h"
+#include "UString.h"
+#include <wtf/FastAllocBase.h>
+#include <wtf/RefPtr.h>
+#include <wtf/Vector.h>
+
+#if ENABLE(JIT)
+#include "StructureStubInfo.h"
+#endif
+
+// Register numbers used in bytecode operations have different meaning accoring to their ranges:
+//      0x80000000-0xFFFFFFFF  Negative indicies from the CallFrame pointer are entries in the call frame, see RegisterFile.h.
+//      0x00000000-0x3FFFFFFF  Forwards indices from the CallFrame pointer are local vars and temporaries with the function's callframe.
+//      0x40000000-0x7FFFFFFF  Positive indices from 0x40000000 specify entries in the constant pool on the CodeBlock.
+static const int FirstConstantRegisterIndex = 0x40000000;
+
+namespace JSC {
+
+    enum HasSeenShouldRepatch {
+        hasSeenShouldRepatch
+    };
+
+    class ExecState;
+
+    enum CodeType { GlobalCode, EvalCode, FunctionCode };
+
+    static ALWAYS_INLINE int missingThisObjectMarker() { return std::numeric_limits<int>::max(); }
+
+    struct HandlerInfo {
+        uint32_t start;
+        uint32_t end;
+        uint32_t target;
+        uint32_t scopeDepth;
+#if ENABLE(JIT)
+        CodeLocationLabel nativeCode;
+#endif
+    };
+
+    struct ExpressionRangeInfo {
+        enum {
+            MaxOffset = (1 << 7) - 1, 
+            MaxDivot = (1 << 25) - 1
+        };
+        uint32_t instructionOffset : 25;
+        uint32_t divotPoint : 25;
+        uint32_t startOffset : 7;
+        uint32_t endOffset : 7;
+    };
+
+    struct LineInfo {
+        uint32_t instructionOffset;
+        int32_t lineNumber;
+    };
+
+    // Both op_construct and op_instanceof require a use of op_get_by_id to get
+    // the prototype property from an object. The exception messages for exceptions
+    // thrown by these instances op_get_by_id need to reflect this.
+    struct GetByIdExceptionInfo {
+        unsigned bytecodeOffset : 31;
+        bool isOpConstruct : 1;
+    };
+
+#if ENABLE(JIT)
+    struct CallLinkInfo {
+        CallLinkInfo()
+            : callee(0)
+        {
+        }
+    
+        unsigned bytecodeIndex;
+        CodeLocationNearCall callReturnLocation;
+        CodeLocationDataLabelPtr hotPathBegin;
+        CodeLocationNearCall hotPathOther;
+        PtrAndFlags<CodeBlock, HasSeenShouldRepatch> ownerCodeBlock;
+        CodeBlock* callee;
+        unsigned position;
+        
+        void setUnlinked() { callee = 0; }
+        bool isLinked() { return callee; }
+
+        bool seenOnce()
+        {
+            return ownerCodeBlock.isFlagSet(hasSeenShouldRepatch);
+        }
+
+        void setSeen()
+        {
+            ownerCodeBlock.setFlag(hasSeenShouldRepatch);
+        }
+    };
+
+    struct MethodCallLinkInfo {
+        MethodCallLinkInfo()
+            : cachedStructure(0)
+        {
+        }
+
+        bool seenOnce()
+        {
+            return cachedPrototypeStructure.isFlagSet(hasSeenShouldRepatch);
+        }
+
+        void setSeen()
+        {
+            cachedPrototypeStructure.setFlag(hasSeenShouldRepatch);
+        }
+
+        CodeLocationCall callReturnLocation;
+        CodeLocationDataLabelPtr structureLabel;
+        Structure* cachedStructure;
+        PtrAndFlags<Structure, HasSeenShouldRepatch> cachedPrototypeStructure;
+    };
+
+    struct FunctionRegisterInfo {
+        FunctionRegisterInfo(unsigned bytecodeOffset, int functionRegisterIndex)
+            : bytecodeOffset(bytecodeOffset)
+            , functionRegisterIndex(functionRegisterIndex)
+        {
+        }
+
+        unsigned bytecodeOffset;
+        int functionRegisterIndex;
+    };
+
+    struct GlobalResolveInfo {
+        GlobalResolveInfo(unsigned bytecodeOffset)
+            : structure(0)
+            , offset(0)
+            , bytecodeOffset(bytecodeOffset)
+        {
+        }
+
+        Structure* structure;
+        unsigned offset;
+        unsigned bytecodeOffset;
+    };
+
+    // This structure is used to map from a call return location
+    // (given as an offset in bytes into the JIT code) back to
+    // the bytecode index of the corresponding bytecode operation.
+    // This is then used to look up the corresponding handler.
+    struct CallReturnOffsetToBytecodeIndex {
+        CallReturnOffsetToBytecodeIndex(unsigned callReturnOffset, unsigned bytecodeIndex)
+            : callReturnOffset(callReturnOffset)
+            , bytecodeIndex(bytecodeIndex)
+        {
+        }
+
+        unsigned callReturnOffset;
+        unsigned bytecodeIndex;
+    };
+
+    // valueAtPosition helpers for the binaryChop algorithm below.
+
+    inline void* getStructureStubInfoReturnLocation(StructureStubInfo* structureStubInfo)
+    {
+        return structureStubInfo->callReturnLocation.executableAddress();
+    }
+
+    inline void* getCallLinkInfoReturnLocation(CallLinkInfo* callLinkInfo)
+    {
+        return callLinkInfo->callReturnLocation.executableAddress();
+    }
+
+    inline void* getMethodCallLinkInfoReturnLocation(MethodCallLinkInfo* methodCallLinkInfo)
+    {
+        return methodCallLinkInfo->callReturnLocation.executableAddress();
+    }
+
+    inline unsigned getCallReturnOffset(CallReturnOffsetToBytecodeIndex* pc)
+    {
+        return pc->callReturnOffset;
+    }
+
+    // Binary chop algorithm, calls valueAtPosition on pre-sorted elements in array,
+    // compares result with key (KeyTypes should be comparable with '--', '<', '>').
+    // Optimized for cases where the array contains the key, checked by assertions.
+    template<typename ArrayType, typename KeyType, KeyType(*valueAtPosition)(ArrayType*)>
+    inline ArrayType* binaryChop(ArrayType* array, size_t size, KeyType key)
+    {
+        // The array must contain at least one element (pre-condition, array does conatin key).
+        // If the array only contains one element, no need to do the comparison.
+        while (size > 1) {
+            // Pick an element to check, half way through the array, and read the value.
+            int pos = (size - 1) >> 1;
+            KeyType val = valueAtPosition(&array[pos]);
+            
+            // If the key matches, success!
+            if (val == key)
+                return &array[pos];
+            // The item we are looking for is smaller than the item being check; reduce the value of 'size',
+            // chopping off the right hand half of the array.
+            else if (key < val)
+                size = pos;
+            // Discard all values in the left hand half of the array, up to and including the item at pos.
+            else {
+                size -= (pos + 1);
+                array += (pos + 1);
+            }
+
+            // 'size' should never reach zero.
+            ASSERT(size);
+        }
+        
+        // If we reach this point we've chopped down to one element, no need to check it matches
+        ASSERT(size == 1);
+        ASSERT(key == valueAtPosition(&array[0]));
+        return &array[0];
+    }
+#endif
+
+    struct ExceptionInfo : FastAllocBase {
+        Vector<ExpressionRangeInfo> m_expressionInfo;
+        Vector<LineInfo> m_lineInfo;
+        Vector<GetByIdExceptionInfo> m_getByIdExceptionInfo;
+
+#if ENABLE(JIT)
+        Vector<CallReturnOffsetToBytecodeIndex> m_callReturnIndexVector;
+#endif
+    };
+
+    class CodeBlock : public FastAllocBase {
+        friend class JIT;
+    protected:
+        CodeBlock(ScriptExecutable* ownerExecutable, CodeType, PassRefPtr<SourceProvider>, unsigned sourceOffset, SymbolTable* symbolTable);
+    public:
+        virtual ~CodeBlock();
+
+        void markAggregate(MarkStack&);
+        void refStructures(Instruction* vPC) const;
+        void derefStructures(Instruction* vPC) const;
+#if ENABLE(JIT_OPTIMIZE_CALL)
+        void unlinkCallers();
+#endif
+
+        static void dumpStatistics();
+
+#if !defined(NDEBUG) || ENABLE_OPCODE_SAMPLING
+        void dump(ExecState*) const;
+        void printStructures(const Instruction*) const;
+        void printStructure(const char* name, const Instruction*, int operand) const;
+#endif
+
+        inline bool isKnownNotImmediate(int index)
+        {
+            if (index == m_thisRegister)
+                return true;
+
+            if (isConstantRegisterIndex(index))
+                return getConstant(index).isCell();
+
+            return false;
+        }
+
+        ALWAYS_INLINE bool isTemporaryRegisterIndex(int index)
+        {
+            return index >= m_numVars;
+        }
+
+        HandlerInfo* handlerForBytecodeOffset(unsigned bytecodeOffset);
+        int lineNumberForBytecodeOffset(CallFrame*, unsigned bytecodeOffset);
+        int expressionRangeForBytecodeOffset(CallFrame*, unsigned bytecodeOffset, int& divot, int& startOffset, int& endOffset);
+        bool getByIdExceptionInfoForBytecodeOffset(CallFrame*, unsigned bytecodeOffset, OpcodeID&);
+
+#if ENABLE(JIT)
+        void addCaller(CallLinkInfo* caller)
+        {
+            caller->callee = this;
+            caller->position = m_linkedCallerList.size();
+            m_linkedCallerList.append(caller);
+        }
+
+        void removeCaller(CallLinkInfo* caller)
+        {
+            unsigned pos = caller->position;
+            unsigned lastPos = m_linkedCallerList.size() - 1;
+
+            if (pos != lastPos) {
+                m_linkedCallerList[pos] = m_linkedCallerList[lastPos];
+                m_linkedCallerList[pos]->position = pos;
+            }
+            m_linkedCallerList.shrink(lastPos);
+        }
+
+        StructureStubInfo& getStubInfo(ReturnAddressPtr returnAddress)
+        {
+            return *(binaryChop<StructureStubInfo, void*, getStructureStubInfoReturnLocation>(m_structureStubInfos.begin(), m_structureStubInfos.size(), returnAddress.value()));
+        }
+
+        CallLinkInfo& getCallLinkInfo(ReturnAddressPtr returnAddress)
+        {
+            return *(binaryChop<CallLinkInfo, void*, getCallLinkInfoReturnLocation>(m_callLinkInfos.begin(), m_callLinkInfos.size(), returnAddress.value()));
+        }
+
+        MethodCallLinkInfo& getMethodCallLinkInfo(ReturnAddressPtr returnAddress)
+        {
+            return *(binaryChop<MethodCallLinkInfo, void*, getMethodCallLinkInfoReturnLocation>(m_methodCallLinkInfos.begin(), m_methodCallLinkInfos.size(), returnAddress.value()));
+        }
+
+        unsigned getBytecodeIndex(CallFrame* callFrame, ReturnAddressPtr returnAddress)
+        {
+            reparseForExceptionInfoIfNecessary(callFrame);
+            return binaryChop<CallReturnOffsetToBytecodeIndex, unsigned, getCallReturnOffset>(callReturnIndexVector().begin(), callReturnIndexVector().size(), ownerExecutable()->generatedJITCode().offsetOf(returnAddress.value()))->bytecodeIndex;
+        }
+        
+        bool functionRegisterForBytecodeOffset(unsigned bytecodeOffset, int& functionRegisterIndex);
+#endif
+
+        void setIsNumericCompareFunction(bool isNumericCompareFunction) { m_isNumericCompareFunction = isNumericCompareFunction; }
+        bool isNumericCompareFunction() { return m_isNumericCompareFunction; }
+
+        Vector<Instruction>& instructions() { return m_instructions; }
+        void discardBytecode() { m_instructions.clear(); }
+
+#ifndef NDEBUG
+        unsigned instructionCount() { return m_instructionCount; }
+        void setInstructionCount(unsigned instructionCount) { m_instructionCount = instructionCount; }
+#endif
+
+#if ENABLE(JIT)
+        JITCode& getJITCode() { return ownerExecutable()->generatedJITCode(); }
+        ExecutablePool* executablePool() { return ownerExecutable()->getExecutablePool(); }
+#endif
+
+        ScriptExecutable* ownerExecutable() const { return m_ownerExecutable; }
+
+        void setGlobalData(JSGlobalData* globalData) { m_globalData = globalData; }
+
+        void setThisRegister(int thisRegister) { m_thisRegister = thisRegister; }
+        int thisRegister() const { return m_thisRegister; }
+
+        void setNeedsFullScopeChain(bool needsFullScopeChain) { m_needsFullScopeChain = needsFullScopeChain; }
+        bool needsFullScopeChain() const { return m_needsFullScopeChain; }
+        void setUsesEval(bool usesEval) { m_usesEval = usesEval; }
+        bool usesEval() const { return m_usesEval; }
+        void setUsesArguments(bool usesArguments) { m_usesArguments = usesArguments; }
+        bool usesArguments() const { return m_usesArguments; }
+
+        CodeType codeType() const { return m_codeType; }
+
+        SourceProvider* source() const { return m_source.get(); }
+        unsigned sourceOffset() const { return m_sourceOffset; }
+
+        size_t numberOfJumpTargets() const { return m_jumpTargets.size(); }
+        void addJumpTarget(unsigned jumpTarget) { m_jumpTargets.append(jumpTarget); }
+        unsigned jumpTarget(int index) const { return m_jumpTargets[index]; }
+        unsigned lastJumpTarget() const { return m_jumpTargets.last(); }
+
+#if !ENABLE(JIT)
+        void addPropertyAccessInstruction(unsigned propertyAccessInstruction) { m_propertyAccessInstructions.append(propertyAccessInstruction); }
+        void addGlobalResolveInstruction(unsigned globalResolveInstruction) { m_globalResolveInstructions.append(globalResolveInstruction); }
+        bool hasGlobalResolveInstructionAtBytecodeOffset(unsigned bytecodeOffset);
+#else
+        size_t numberOfStructureStubInfos() const { return m_structureStubInfos.size(); }
+        void addStructureStubInfo(const StructureStubInfo& stubInfo) { m_structureStubInfos.append(stubInfo); }
+        StructureStubInfo& structureStubInfo(int index) { return m_structureStubInfos[index]; }
+
+        void addGlobalResolveInfo(unsigned globalResolveInstruction) { m_globalResolveInfos.append(GlobalResolveInfo(globalResolveInstruction)); }
+        GlobalResolveInfo& globalResolveInfo(int index) { return m_globalResolveInfos[index]; }
+        bool hasGlobalResolveInfoAtBytecodeOffset(unsigned bytecodeOffset);
+
+        size_t numberOfCallLinkInfos() const { return m_callLinkInfos.size(); }
+        void addCallLinkInfo() { m_callLinkInfos.append(CallLinkInfo()); }
+        CallLinkInfo& callLinkInfo(int index) { return m_callLinkInfos[index]; }
+
+        void addMethodCallLinkInfos(unsigned n) { m_methodCallLinkInfos.grow(n); }
+        MethodCallLinkInfo& methodCallLinkInfo(int index) { return m_methodCallLinkInfos[index]; }
+
+        void addFunctionRegisterInfo(unsigned bytecodeOffset, int functionIndex) { createRareDataIfNecessary(); m_rareData->m_functionRegisterInfos.append(FunctionRegisterInfo(bytecodeOffset, functionIndex)); }
+#endif
+
+        // Exception handling support
+
+        size_t numberOfExceptionHandlers() const { return m_rareData ? m_rareData->m_exceptionHandlers.size() : 0; }
+        void addExceptionHandler(const HandlerInfo& hanler) { createRareDataIfNecessary(); return m_rareData->m_exceptionHandlers.append(hanler); }
+        HandlerInfo& exceptionHandler(int index) { ASSERT(m_rareData); return m_rareData->m_exceptionHandlers[index]; }
+
+        bool hasExceptionInfo() const { return m_exceptionInfo; }
+        void clearExceptionInfo() { m_exceptionInfo.clear(); }
+        ExceptionInfo* extractExceptionInfo() { ASSERT(m_exceptionInfo); return m_exceptionInfo.release(); }
+
+        void addExpressionInfo(const ExpressionRangeInfo& expressionInfo) { ASSERT(m_exceptionInfo); m_exceptionInfo->m_expressionInfo.append(expressionInfo); }
+        void addGetByIdExceptionInfo(const GetByIdExceptionInfo& info) { ASSERT(m_exceptionInfo); m_exceptionInfo->m_getByIdExceptionInfo.append(info); }
+
+        size_t numberOfLineInfos() const { ASSERT(m_exceptionInfo); return m_exceptionInfo->m_lineInfo.size(); }
+        void addLineInfo(const LineInfo& lineInfo) { ASSERT(m_exceptionInfo); m_exceptionInfo->m_lineInfo.append(lineInfo); }
+        LineInfo& lastLineInfo() { ASSERT(m_exceptionInfo); return m_exceptionInfo->m_lineInfo.last(); }
+
+#if ENABLE(JIT)
+        Vector<CallReturnOffsetToBytecodeIndex>& callReturnIndexVector() { ASSERT(m_exceptionInfo); return m_exceptionInfo->m_callReturnIndexVector; }
+#endif
+
+        // Constant Pool
+
+        size_t numberOfIdentifiers() const { return m_identifiers.size(); }
+        void addIdentifier(const Identifier& i) { return m_identifiers.append(i); }
+        Identifier& identifier(int index) { return m_identifiers[index]; }
+
+        size_t numberOfConstantRegisters() const { return m_constantRegisters.size(); }
+        void addConstantRegister(const Register& r) { return m_constantRegisters.append(r); }
+        Register& constantRegister(int index) { return m_constantRegisters[index - FirstConstantRegisterIndex]; }
+        ALWAYS_INLINE bool isConstantRegisterIndex(int index) { return index >= FirstConstantRegisterIndex; }
+        ALWAYS_INLINE JSValue getConstant(int index) const { return m_constantRegisters[index - FirstConstantRegisterIndex].jsValue(); }
+
+        unsigned addFunctionDecl(NonNullPassRefPtr<FunctionExecutable> n) { unsigned size = m_functionDecls.size(); m_functionDecls.append(n); return size; }
+        FunctionExecutable* functionDecl(int index) { return m_functionDecls[index].get(); }
+        int numberOfFunctionDecls() { return m_functionDecls.size(); }
+        unsigned addFunctionExpr(NonNullPassRefPtr<FunctionExecutable> n) { unsigned size = m_functionExprs.size(); m_functionExprs.append(n); return size; }
+        FunctionExecutable* functionExpr(int index) { return m_functionExprs[index].get(); }
+
+        unsigned addRegExp(RegExp* r) { createRareDataIfNecessary(); unsigned size = m_rareData->m_regexps.size(); m_rareData->m_regexps.append(r); return size; }
+        RegExp* regexp(int index) const { ASSERT(m_rareData); return m_rareData->m_regexps[index].get(); }
+
+
+        // Jump Tables
+
+        size_t numberOfImmediateSwitchJumpTables() const { return m_rareData ? m_rareData->m_immediateSwitchJumpTables.size() : 0; }
+        SimpleJumpTable& addImmediateSwitchJumpTable() { createRareDataIfNecessary(); m_rareData->m_immediateSwitchJumpTables.append(SimpleJumpTable()); return m_rareData->m_immediateSwitchJumpTables.last(); }
+        SimpleJumpTable& immediateSwitchJumpTable(int tableIndex) { ASSERT(m_rareData); return m_rareData->m_immediateSwitchJumpTables[tableIndex]; }
+
+        size_t numberOfCharacterSwitchJumpTables() const { return m_rareData ? m_rareData->m_characterSwitchJumpTables.size() : 0; }
+        SimpleJumpTable& addCharacterSwitchJumpTable() { createRareDataIfNecessary(); m_rareData->m_characterSwitchJumpTables.append(SimpleJumpTable()); return m_rareData->m_characterSwitchJumpTables.last(); }
+        SimpleJumpTable& characterSwitchJumpTable(int tableIndex) { ASSERT(m_rareData); return m_rareData->m_characterSwitchJumpTables[tableIndex]; }
+
+        size_t numberOfStringSwitchJumpTables() const { return m_rareData ? m_rareData->m_stringSwitchJumpTables.size() : 0; }
+        StringJumpTable& addStringSwitchJumpTable() { createRareDataIfNecessary(); m_rareData->m_stringSwitchJumpTables.append(StringJumpTable()); return m_rareData->m_stringSwitchJumpTables.last(); }
+        StringJumpTable& stringSwitchJumpTable(int tableIndex) { ASSERT(m_rareData); return m_rareData->m_stringSwitchJumpTables[tableIndex]; }
+
+
+        SymbolTable* symbolTable() { return m_symbolTable; }
+        SharedSymbolTable* sharedSymbolTable() { ASSERT(m_codeType == FunctionCode); return static_cast<SharedSymbolTable*>(m_symbolTable); }
+
+        EvalCodeCache& evalCodeCache() { createRareDataIfNecessary(); return m_rareData->m_evalCodeCache; }
+
+        void shrinkToFit();
+
+        // FIXME: Make these remaining members private.
+
+        int m_numCalleeRegisters;
+        int m_numVars;
+        int m_numParameters;
+
+    private:
+#if !defined(NDEBUG) || ENABLE(OPCODE_SAMPLING)
+        void dump(ExecState*, const Vector<Instruction>::const_iterator& begin, Vector<Instruction>::const_iterator&) const;
+#endif
+
+        void reparseForExceptionInfoIfNecessary(CallFrame*);
+
+        void createRareDataIfNecessary()
+        {
+            if (!m_rareData)
+                m_rareData.set(new RareData);
+        }
+
+        ScriptExecutable* m_ownerExecutable;
+        JSGlobalData* m_globalData;
+
+        Vector<Instruction> m_instructions;
+#ifndef NDEBUG
+        unsigned m_instructionCount;
+#endif
+
+        int m_thisRegister;
+
+        bool m_needsFullScopeChain;
+        bool m_usesEval;
+        bool m_usesArguments;
+        bool m_isNumericCompareFunction;
+
+        CodeType m_codeType;
+
+        RefPtr<SourceProvider> m_source;
+        unsigned m_sourceOffset;
+
+#if !ENABLE(JIT)
+        Vector<unsigned> m_propertyAccessInstructions;
+        Vector<unsigned> m_globalResolveInstructions;
+#else
+        Vector<StructureStubInfo> m_structureStubInfos;
+        Vector<GlobalResolveInfo> m_globalResolveInfos;
+        Vector<CallLinkInfo> m_callLinkInfos;
+        Vector<MethodCallLinkInfo> m_methodCallLinkInfos;
+        Vector<CallLinkInfo*> m_linkedCallerList;
+#endif
+
+        Vector<unsigned> m_jumpTargets;
+
+        // Constant Pool
+        Vector<Identifier> m_identifiers;
+        Vector<Register> m_constantRegisters;
+        Vector<RefPtr<FunctionExecutable> > m_functionDecls;
+        Vector<RefPtr<FunctionExecutable> > m_functionExprs;
+
+        SymbolTable* m_symbolTable;
+
+        OwnPtr<ExceptionInfo> m_exceptionInfo;
+
+        struct RareData : FastAllocBase {
+            Vector<HandlerInfo> m_exceptionHandlers;
+
+            // Rare Constants
+            Vector<RefPtr<RegExp> > m_regexps;
+
+            // Jump Tables
+            Vector<SimpleJumpTable> m_immediateSwitchJumpTables;
+            Vector<SimpleJumpTable> m_characterSwitchJumpTables;
+            Vector<StringJumpTable> m_stringSwitchJumpTables;
+
+            EvalCodeCache m_evalCodeCache;
+
+#if ENABLE(JIT)
+            Vector<FunctionRegisterInfo> m_functionRegisterInfos;
+#endif
+        };
+        OwnPtr<RareData> m_rareData;
+    };
+
+    // Program code is not marked by any function, so we make the global object
+    // responsible for marking it.
+
+    class GlobalCodeBlock : public CodeBlock {
+    public:
+        GlobalCodeBlock(ScriptExecutable* ownerExecutable, CodeType codeType, PassRefPtr<SourceProvider> sourceProvider, unsigned sourceOffset, JSGlobalObject* globalObject)
+            : CodeBlock(ownerExecutable, codeType, sourceProvider, sourceOffset, &m_unsharedSymbolTable)
+            , m_globalObject(globalObject)
+        {
+            m_globalObject->codeBlocks().add(this);
+        }
+
+        ~GlobalCodeBlock()
+        {
+            if (m_globalObject)
+                m_globalObject->codeBlocks().remove(this);
+        }
+
+        void clearGlobalObject() { m_globalObject = 0; }
+
+    private:
+        JSGlobalObject* m_globalObject; // For program and eval nodes, the global object that marks the constant pool.
+        SymbolTable m_unsharedSymbolTable;
+    };
+
+    class ProgramCodeBlock : public GlobalCodeBlock {
+    public:
+        ProgramCodeBlock(ProgramExecutable* ownerExecutable, CodeType codeType, JSGlobalObject* globalObject, PassRefPtr<SourceProvider> sourceProvider)
+            : GlobalCodeBlock(ownerExecutable, codeType, sourceProvider, 0, globalObject)
+        {
+        }
+    };
+
+    class EvalCodeBlock : public GlobalCodeBlock {
+    public:
+        EvalCodeBlock(EvalExecutable* ownerExecutable, JSGlobalObject* globalObject, PassRefPtr<SourceProvider> sourceProvider, int baseScopeDepth)
+            : GlobalCodeBlock(ownerExecutable, EvalCode, sourceProvider, 0, globalObject)
+            , m_baseScopeDepth(baseScopeDepth)
+        {
+        }
+
+        int baseScopeDepth() const { return m_baseScopeDepth; }
+
+        const Identifier& variable(unsigned index) { return m_variables[index]; }
+        unsigned numVariables() { return m_variables.size(); }
+        void adoptVariables(Vector<Identifier>& variables)
+        {
+            ASSERT(m_variables.isEmpty());
+            m_variables.swap(variables);
+        }
+
+    private:
+        int m_baseScopeDepth;
+        Vector<Identifier> m_variables;
+    };
+
+    class FunctionCodeBlock : public CodeBlock {
+    public:
+        // Rather than using the usual RefCounted::create idiom for SharedSymbolTable we just use new
+        // as we need to initialise the CodeBlock before we could initialise any RefPtr to hold the shared
+        // symbol table, so we just pass as a raw pointer with a ref count of 1.  We then manually deref
+        // in the destructor.
+        FunctionCodeBlock(FunctionExecutable* ownerExecutable, CodeType codeType, PassRefPtr<SourceProvider> sourceProvider, unsigned sourceOffset)
+            : CodeBlock(ownerExecutable, codeType, sourceProvider, sourceOffset, new SharedSymbolTable)
+        {
+        }
+        ~FunctionCodeBlock()
+        {
+            sharedSymbolTable()->deref();
+        }
+    };
+
+    inline Register& ExecState::r(int index)
+    {
+        CodeBlock* codeBlock = this->codeBlock();
+        if (codeBlock->isConstantRegisterIndex(index))
+            return codeBlock->constantRegister(index);
+        return this[index];
+    }
+
+} // namespace JSC
+
+#endif // CodeBlock_h