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diff --git a/Source/JavaScriptCore/runtime/EnumerationMode.h b/Source/JavaScriptCore/runtime/EnumerationMode.h
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+/*
+ * Copyright (C) 2014 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 INC. 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 INC. 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 EnumerationMode_h
+#define EnumerationMode_h
+
+namespace JSC {
+
+enum class PropertyNameMode {
+    Symbols = 1 << 0,
+    Strings = 1 << 1,
+    StringsAndSymbols = Symbols | Strings,
+};
+
+enum class DontEnumPropertiesMode {
+    Include,
+    Exclude
+};
+
+enum class JSObjectPropertiesMode {
+    Include,
+    Exclude
+};
+
+class EnumerationMode {
+public:
+    EnumerationMode(DontEnumPropertiesMode dontEnumPropertiesMode = DontEnumPropertiesMode::Exclude, JSObjectPropertiesMode jsObjectPropertiesMode = JSObjectPropertiesMode::Include)
+        : m_dontEnumPropertiesMode(dontEnumPropertiesMode)
+        , m_jsObjectPropertiesMode(jsObjectPropertiesMode)
+    {
+    }
+
+    EnumerationMode(const EnumerationMode& mode, JSObjectPropertiesMode jsObjectPropertiesMode)
+        : m_dontEnumPropertiesMode(mode.m_dontEnumPropertiesMode)
+        , m_jsObjectPropertiesMode(jsObjectPropertiesMode)
+    {
+    }
+
+    // Add other constructors as needed for convenience
+
+    bool includeDontEnumProperties()
+    {
+        return m_dontEnumPropertiesMode == DontEnumPropertiesMode::Include;
+    }
+
+    bool includeJSObjectProperties()
+    {
+        return m_jsObjectPropertiesMode == JSObjectPropertiesMode::Include;
+    }
+
+private:
+    DontEnumPropertiesMode m_dontEnumPropertiesMode;
+    JSObjectPropertiesMode m_jsObjectPropertiesMode;
+};
+
+} // namespace JSC
+
+#endif // EnumerationMode_h