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diff --git a/Source/JavaScriptCore/runtime/JSLexicalEnvironment.cpp b/Source/JavaScriptCore/runtime/JSLexicalEnvironment.cpp
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+++ b/Source/JavaScriptCore/runtime/JSLexicalEnvironment.cpp
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+/*
+ * Copyright (C) 2008, 2009, 2014, 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.
+ * 3.  Neither the name of Apple 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.
+ */
+
+#include "config.h"
+#include "JSLexicalEnvironment.h"
+
+#include "Interpreter.h"
+#include "JSFunction.h"
+#include "JSCInlines.h"
+
+using namespace std;
+
+namespace JSC {
+
+const ClassInfo JSLexicalEnvironment::s_info = { "JSLexicalEnvironment", &Base::s_info, 0, CREATE_METHOD_TABLE(JSLexicalEnvironment) };
+
+void JSLexicalEnvironment::getOwnNonIndexPropertyNames(JSObject* object, ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
+{
+    JSLexicalEnvironment* thisObject = jsCast<JSLexicalEnvironment*>(object);
+
+    {
+        ConcurrentJITLocker locker(thisObject->symbolTable()->m_lock);
+        SymbolTable::Map::iterator end = thisObject->symbolTable()->end(locker);
+        for (SymbolTable::Map::iterator it = thisObject->symbolTable()->begin(locker); it != end; ++it) {
+            if (it->value.getAttributes() & DontEnum && !mode.includeDontEnumProperties())
+                continue;
+            if (!thisObject->isValidScopeOffset(it->value.scopeOffset()))
+                continue;
+            if (it->key->isSymbol() && !propertyNames.includeSymbolProperties())
+                continue;
+            propertyNames.add(Identifier::fromUid(exec, it->key.get()));
+        }
+    }
+    // Skip the JSEnvironmentRecord implementation of getOwnNonIndexPropertyNames
+    JSObject::getOwnNonIndexPropertyNames(thisObject, exec, propertyNames, mode);
+}
+
+bool JSLexicalEnvironment::getOwnPropertySlot(JSObject* object, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
+{
+    JSLexicalEnvironment* thisObject = jsCast<JSLexicalEnvironment*>(object);
+
+    if (symbolTableGet(thisObject, propertyName, slot))
+        return true;
+
+    unsigned attributes;
+    if (JSValue value = thisObject->getDirect(exec->vm(), propertyName, attributes)) {
+        slot.setValue(thisObject, attributes, value);
+        return true;
+    }
+
+    // We don't call through to JSObject because there's no way to give a 
+    // lexical environment object getter properties or a prototype.
+    ASSERT(!thisObject->hasGetterSetterProperties());
+    ASSERT(thisObject->prototype().isNull());
+    return false;
+}
+
+void JSLexicalEnvironment::put(JSCell* cell, ExecState* exec, PropertyName propertyName, JSValue value, PutPropertySlot& slot)
+{
+    JSLexicalEnvironment* thisObject = jsCast<JSLexicalEnvironment*>(cell);
+    ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(thisObject));
+
+    bool shouldThrowReadOnlyError = slot.isStrictMode() || thisObject->isLexicalScope();
+    bool ignoreReadOnlyErrors = false;
+    if (symbolTablePutInvalidateWatchpointSet(thisObject, exec, propertyName, value, shouldThrowReadOnlyError, ignoreReadOnlyErrors))
+        return;
+
+    // We don't call through to JSObject because __proto__ and getter/setter 
+    // properties are non-standard extensions that other implementations do not
+    // expose in the lexicalEnvironment object.
+    ASSERT(!thisObject->hasGetterSetterProperties());
+    thisObject->putOwnDataProperty(exec->vm(), propertyName, value, slot);
+}
+
+bool JSLexicalEnvironment::deleteProperty(JSCell* cell, ExecState* exec, PropertyName propertyName)
+{
+    if (propertyName == exec->propertyNames().arguments)
+        return false;
+
+    return Base::deleteProperty(cell, exec, propertyName);
+}
+
+JSValue JSLexicalEnvironment::toThis(JSCell*, ExecState* exec, ECMAMode ecmaMode)
+{
+    if (ecmaMode == StrictMode)
+        return jsUndefined();
+    return exec->globalThisValue();
+}
+
+} // namespace JSC