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diff --git a/Source/JavaScriptCore/bytecode/InternalFunctionAllocationProfile.h b/Source/JavaScriptCore/bytecode/InternalFunctionAllocationProfile.h
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+++ b/Source/JavaScriptCore/bytecode/InternalFunctionAllocationProfile.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.
+ */
+
+#ifndef InternalFunctionAllocationProfile_h
+#define InternalFunctionAllocationProfile_h
+
+#include "JSGlobalObject.h"
+#include "ObjectPrototype.h"
+#include "SlotVisitor.h"
+#include "WriteBarrier.h"
+
+namespace JSC {
+
+class InternalFunctionAllocationProfile {
+public:
+    Structure* structure() { return m_structure.get(); }
+    Structure* createAllocationStructureFromBase(VM&, JSCell* owner, JSObject* prototype, Structure* base);
+
+    void clear() { m_structure.clear(); }
+    void visitAggregate(SlotVisitor& visitor) { visitor.append(&m_structure); }
+
+private:
+    WriteBarrier<Structure> m_structure;
+};
+
+inline Structure* InternalFunctionAllocationProfile::createAllocationStructureFromBase(VM& vm, JSCell* owner, JSObject* prototype, Structure* baseStructure)
+{
+    ASSERT(prototype != baseStructure->storedPrototype());
+    ASSERT(!m_structure || m_structure.get()->classInfo() != baseStructure->classInfo());
+
+    Structure* structure = vm.prototypeMap.emptyStructureForPrototypeFromBaseStructure(prototype, baseStructure);
+
+    // Ensure that if another thread sees the structure, it will see it properly created.
+    WTF::storeStoreFence();
+
+    m_structure.set(vm, owner, structure);
+    return m_structure.get();
+}
+
+} // namespace JSC
+
+#endif /* InternalFunctionAllocationProfile_h */