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diff --git a/Source/JavaScriptCore/dfg/DFGRegisteredStructure.h b/Source/JavaScriptCore/dfg/DFGRegisteredStructure.h
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+++ b/Source/JavaScriptCore/dfg/DFGRegisteredStructure.h
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+/*
+ * Copyright (C) 2017 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
+
+#if ENABLE(DFG_JIT)
+
+#include "Structure.h"
+#include "StructureSet.h"
+
+namespace JSC { namespace DFG {
+
+class Graph;
+
+class RegisteredStructure {
+public:
+    RegisteredStructure() = default;
+
+    ALWAYS_INLINE Structure* get() const { return m_structure; }
+    Structure* operator->() const { return get(); }
+
+    bool operator==(const RegisteredStructure& other) const
+    {
+        return get() == other.get();
+    }
+
+    bool operator!=(const RegisteredStructure& other) const
+    {
+        return !(*this == other);
+    }
+
+    explicit operator bool() const
+    {
+        return !!get();
+    }
+
+private:
+    friend class Graph;
+
+    RegisteredStructure(Structure* structure)
+        : m_structure(structure)
+    {
+        ASSERT(structure);
+    }
+
+    static RegisteredStructure createPrivate(Structure* structure)
+    {
+        return RegisteredStructure(structure);
+    }
+
+    Structure* m_structure { nullptr };
+};
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)