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diff --git a/Source/JavaScriptCore/runtime/JSGlobalLexicalEnvironment.h b/Source/JavaScriptCore/runtime/JSGlobalLexicalEnvironment.h
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+++ b/Source/JavaScriptCore/runtime/JSGlobalLexicalEnvironment.h
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+/*
+ * Copyright (C) 2015 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. ``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
+ * 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. 
+ */
+
+#pragma once
+
+#include "JSSegmentedVariableObject.h"
+
+namespace JSC {
+
+class JSGlobalLexicalEnvironment : public JSSegmentedVariableObject {
+
+public:
+    typedef JSSegmentedVariableObject Base;
+
+    static const unsigned StructureFlags = Base::StructureFlags | OverridesGetOwnPropertySlot | OverridesToThis;
+
+    static JSGlobalLexicalEnvironment* create(VM& vm, Structure* structure, JSScope* parentScope)
+    {
+        JSGlobalLexicalEnvironment* result =
+            new (NotNull, allocateCell<JSGlobalLexicalEnvironment>(vm.heap)) JSGlobalLexicalEnvironment(vm, structure, parentScope);
+        result->finishCreation(vm);
+        result->symbolTable()->setScopeType(SymbolTable::ScopeType::GlobalLexicalScope);
+        return result;
+    }
+
+    static bool getOwnPropertySlot(JSObject*, ExecState*, PropertyName, PropertySlot&);
+    static bool put(JSCell*, ExecState*, PropertyName, JSValue, PutPropertySlot&);
+
+    static void destroy(JSCell*);
+    // We don't need a destructor because we use a finalizer instead.
+    static const bool needsDestruction = false;
+
+    bool isEmpty() const { return !symbolTable()->size(); }
+    bool isConstVariable(UniquedStringImpl*);
+
+    static JSValue toThis(JSCell*, ExecState*, ECMAMode);
+    
+    DECLARE_INFO;
+
+    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject)
+    {
+        return Structure::create(vm, globalObject, jsNull(), TypeInfo(GlobalLexicalEnvironmentType, StructureFlags), info());
+    }
+
+protected:
+    JSGlobalLexicalEnvironment(VM& vm, Structure* structure, JSScope* scope)
+        : Base(vm, structure, scope)
+    {
+    }
+};
+
+} // namespace JSC