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diff --git a/Source/JavaScriptCore/runtime/JSGlobalObjectInlines.h b/Source/JavaScriptCore/runtime/JSGlobalObjectInlines.h
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+++ b/Source/JavaScriptCore/runtime/JSGlobalObjectInlines.h
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+/*
+ * Copyright (C) 2016 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 "JSGlobalObject.h"
+
+#include "ArrayPrototype.h"
+#include "ObjectPrototype.h"
+
+namespace JSC {
+
+ALWAYS_INLINE bool JSGlobalObject::objectPrototypeIsSane()
+{
+    return !hasIndexedProperties(m_objectPrototype->indexingType())
+        && m_objectPrototype->getPrototypeDirect().isNull();
+}
+
+ALWAYS_INLINE bool JSGlobalObject::arrayPrototypeChainIsSane()
+{
+    return !hasIndexedProperties(m_arrayPrototype->indexingType())
+        && m_arrayPrototype->getPrototypeDirect() == m_objectPrototype.get()
+        && objectPrototypeIsSane();
+}
+
+ALWAYS_INLINE bool JSGlobalObject::stringPrototypeChainIsSane()
+{
+    return !hasIndexedProperties(m_stringPrototype->indexingType())
+        && m_stringPrototype->getPrototypeDirect() == m_objectPrototype.get()
+        && objectPrototypeIsSane();
+}
+
+
+ALWAYS_INLINE bool JSGlobalObject::isArrayIteratorProtocolFastAndNonObservable()
+{
+    // We're fast if we don't have any indexed properties on the prototype.
+    // We're non-observable if the iteration protocol hasn't changed.
+    //
+    // Note: it only makes sense to call this from the main thread. If you're
+    // trying to prove this behavior on the compiler thread, you'll want to
+    // carefully set up watchpoints to have correct ordering while JS code is
+    // executing concurrently.
+
+    return arrayIteratorProtocolWatchpoint().isStillValid() && !isHavingABadTime() && arrayPrototypeChainIsSane();
+}
+
+} // namespace JSC