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diff --git a/Source/JavaScriptCore/runtime/RegExpConstructor.h b/Source/JavaScriptCore/runtime/RegExpConstructor.h
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+++ b/Source/JavaScriptCore/runtime/RegExpConstructor.h
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+/*
+ *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
+ *  Copyright (C) 2003, 2007, 2008 Apple Inc. All Rights Reserved.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#ifndef RegExpConstructor_h
+#define RegExpConstructor_h
+
+#include "InternalFunction.h"
+#include "RegExp.h"
+#include <wtf/OwnPtr.h>
+
+namespace JSC {
+
+    class RegExp;
+    class RegExpPrototype;
+    struct RegExpConstructorPrivate;
+
+    struct RegExpConstructorPrivate : FastAllocBase {
+        // Global search cache / settings
+        RegExpConstructorPrivate()
+            : lastNumSubPatterns(0)
+            , multiline(false)
+            , lastOvectorIndex(0)
+        {
+        }
+
+        const Vector<int, 32>& lastOvector() const { return ovector[lastOvectorIndex]; }
+        Vector<int, 32>& lastOvector() { return ovector[lastOvectorIndex]; }
+        Vector<int, 32>& tempOvector() { return ovector[lastOvectorIndex ? 0 : 1]; }
+        void changeLastOvector() { lastOvectorIndex = lastOvectorIndex ? 0 : 1; }
+
+        UString input;
+        UString lastInput;
+        Vector<int, 32> ovector[2];
+        unsigned lastNumSubPatterns : 30;
+        bool multiline : 1;
+        unsigned lastOvectorIndex : 1;
+    };
+
+    class RegExpConstructor : public InternalFunction {
+    public:
+        RegExpConstructor(ExecState*, JSGlobalObject*, NonNullPassRefPtr<Structure>, RegExpPrototype*);
+
+        static PassRefPtr<Structure> createStructure(JSValue prototype)
+        {
+            return Structure::create(prototype, TypeInfo(ObjectType, StructureFlags), AnonymousSlotCount);
+        }
+
+        virtual void put(ExecState*, const Identifier& propertyName, JSValue, PutPropertySlot&);
+        virtual bool getOwnPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot&);
+        virtual bool getOwnPropertyDescriptor(ExecState*, const Identifier&, PropertyDescriptor&);
+
+        static const ClassInfo info;
+
+        void performMatch(RegExp*, const UString&, int startOffset, int& position, int& length, int** ovector = 0);
+        JSObject* arrayOfMatches(ExecState*) const;
+
+        void setInput(const UString&);
+        const UString& input() const;
+
+        void setMultiline(bool);
+        bool multiline() const;
+
+        JSValue getBackref(ExecState*, unsigned) const;
+        JSValue getLastParen(ExecState*) const;
+        JSValue getLeftContext(ExecState*) const;
+        JSValue getRightContext(ExecState*) const;
+
+    protected:
+        static const unsigned StructureFlags = OverridesGetOwnPropertySlot | ImplementsHasInstance | InternalFunction::StructureFlags;
+
+    private:
+        virtual ConstructType getConstructData(ConstructData&);
+        virtual CallType getCallData(CallData&);
+
+        virtual const ClassInfo* classInfo() const { return &info; }
+
+        OwnPtr<RegExpConstructorPrivate> d;
+    };
+
+    RegExpConstructor* asRegExpConstructor(JSValue);
+
+    JSObject* constructRegExp(ExecState*, const ArgList&);
+
+    inline RegExpConstructor* asRegExpConstructor(JSValue value)
+    {
+        ASSERT(asObject(value)->inherits(&RegExpConstructor::info));
+        return static_cast<RegExpConstructor*>(asObject(value));
+    }
+
+    /* 
+      To facilitate result caching, exec(), test(), match(), search(), and replace() dipatch regular
+      expression matching through the performMatch function. We use cached results to calculate, 
+      e.g., RegExp.lastMatch and RegExp.leftParen.
+    */
+    ALWAYS_INLINE void RegExpConstructor::performMatch(RegExp* r, const UString& s, int startOffset, int& position, int& length, int** ovector)
+    {
+        position = r->match(s, startOffset, &d->tempOvector());
+
+        if (ovector)
+            *ovector = d->tempOvector().data();
+
+        if (position != -1) {
+            ASSERT(!d->tempOvector().isEmpty());
+
+            length = d->tempOvector()[1] - d->tempOvector()[0];
+
+            d->input = s;
+            d->lastInput = s;
+            d->changeLastOvector();
+            d->lastNumSubPatterns = r->numSubpatterns();
+        }
+    }
+
+} // namespace JSC
+
+#endif // RegExpConstructor_h