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diff --git a/Source/JavaScriptCore/dfg/DFGRegisteredStructureSet.h b/Source/JavaScriptCore/dfg/DFGRegisteredStructureSet.h
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+++ b/Source/JavaScriptCore/dfg/DFGRegisteredStructureSet.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 "DFGRegisteredStructure.h"
+#include "StructureSet.h"
+#include <wtf/TinyPtrSet.h>
+
+namespace JSC {
+
+class TrackedReferences;
+
+namespace DFG {
+
+struct AbstractValue;
+class StructureAbstractValue;
+
+class RegisteredStructureSet : public TinyPtrSet<RegisteredStructure> {
+public:
+
+    RegisteredStructureSet()
+    { }
+    
+    RegisteredStructureSet(RegisteredStructure structure)
+        : TinyPtrSet(structure)
+    {
+    }
+    
+    ALWAYS_INLINE RegisteredStructureSet(const RegisteredStructureSet& other)
+        : TinyPtrSet(other)
+    {
+    }
+    
+    RegisteredStructure onlyStructure() const
+    {
+        return onlyEntry();
+    }
+
+    StructureSet toStructureSet() const
+    {
+        StructureSet result;
+        forEach([&] (RegisteredStructure structure) { result.add(structure.get()); });
+        return result;
+    }
+
+    void filter(const DFG::StructureAbstractValue&);
+    void filter(SpeculatedType);
+    void filterArrayModes(ArrayModes);
+    void filter(const DFG::AbstractValue&);
+    
+    SpeculatedType speculationFromStructures() const;
+    ArrayModes arrayModesFromStructures() const;
+
+    void validateReferences(const TrackedReferences&) const;
+};
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)