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diff --git a/Source/JavaScriptCore/runtime/JSTypeInfo.h b/Source/JavaScriptCore/runtime/JSTypeInfo.h
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+++ b/Source/JavaScriptCore/runtime/JSTypeInfo.h
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+// -*- mode: c++; c-basic-offset: 4 -*-
+/*
+ * Copyright (C) 2008 Apple Inc. All rights reserved.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 COMPUTER, INC. OR
+ * 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 JSTypeInfo_h
+#define JSTypeInfo_h
+
+// This file would be called TypeInfo.h, but that conflicts with <typeinfo.h>
+// in the STL on systems without case-sensitive file systems. 
+
+#include "JSType.h"
+
+namespace JSC {
+
+    // WebCore uses MasqueradesAsUndefined to make document.all and style.filter undetectable.
+    static const unsigned MasqueradesAsUndefined = 1;
+    static const unsigned ImplementsHasInstance = 1 << 1;
+    static const unsigned OverridesHasInstance = 1 << 2;
+    static const unsigned ImplementsDefaultHasInstance = 1 << 3;
+    static const unsigned NeedsThisConversion = 1 << 4;
+    static const unsigned OverridesGetOwnPropertySlot = 1 << 5;
+    static const unsigned OverridesMarkChildren = 1 << 6;
+    static const unsigned OverridesGetPropertyNames = 1 << 7;
+
+    class TypeInfo {
+        friend class JIT;
+    public:
+        TypeInfo(JSType type, unsigned flags = 0)
+            : m_type(type)
+        {
+            ASSERT(flags <= 0xFF);
+            ASSERT(type <= 0xFF);
+            // ImplementsDefaultHasInstance means (ImplementsHasInstance & !OverridesHasInstance)
+            if ((flags & (ImplementsHasInstance | OverridesHasInstance)) == ImplementsHasInstance)
+                m_flags = flags | ImplementsDefaultHasInstance;
+            else
+                m_flags = flags;
+        }
+
+        JSType type() const { return (JSType)m_type; }
+
+        bool masqueradesAsUndefined() const { return m_flags & MasqueradesAsUndefined; }
+        bool implementsHasInstance() const { return m_flags & ImplementsHasInstance; }
+        bool overridesHasInstance() const { return m_flags & OverridesHasInstance; }
+        bool needsThisConversion() const { return m_flags & NeedsThisConversion; }
+        bool overridesGetOwnPropertySlot() const { return m_flags & OverridesGetOwnPropertySlot; }
+        bool overridesMarkChildren() const { return m_flags & OverridesMarkChildren; }
+        bool overridesGetPropertyNames() const { return m_flags & OverridesGetPropertyNames; }
+        unsigned flags() const { return m_flags; }
+
+    private:
+        unsigned char m_type;
+        unsigned char m_flags;
+    };
+
+}
+
+#endif // JSTypeInfo_h