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diff --git a/Source/JavaScriptCore/bytecode/PutByIdVariant.h b/Source/JavaScriptCore/bytecode/PutByIdVariant.h
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+++ b/Source/JavaScriptCore/bytecode/PutByIdVariant.h
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+/*
+ * Copyright (C) 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.
+ *
+ * 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 PutByIdVariant_h
+#define PutByIdVariant_h
+
+#include "ObjectPropertyConditionSet.h"
+#include "PropertyOffset.h"
+#include "StructureSet.h"
+
+namespace JSC {
+
+class CallLinkStatus;
+
+class PutByIdVariant {
+public:
+    enum Kind {
+        NotSet,
+        Replace,
+        Transition,
+        Setter
+    };
+    
+    PutByIdVariant()
+        : m_kind(NotSet)
+        , m_newStructure(nullptr)
+        , m_offset(invalidOffset)
+    {
+    }
+    
+    PutByIdVariant(const PutByIdVariant&);
+    PutByIdVariant& operator=(const PutByIdVariant&);
+
+    static PutByIdVariant replace(const StructureSet&, PropertyOffset, const InferredType::Descriptor&);
+    
+    static PutByIdVariant transition(
+        const StructureSet& oldStructure, Structure* newStructure,
+        const ObjectPropertyConditionSet&, PropertyOffset, const InferredType::Descriptor&);
+    
+    static PutByIdVariant setter(
+        const StructureSet&, PropertyOffset, const ObjectPropertyConditionSet&,
+        std::unique_ptr<CallLinkStatus>);
+    
+    Kind kind() const { return m_kind; }
+    
+    bool isSet() const { return kind() != NotSet; }
+    bool operator!() const { return !isSet(); }
+    
+    const StructureSet& structure() const
+    {
+        ASSERT(kind() == Replace || kind() == Setter);
+        return m_oldStructure;
+    }
+    
+    const StructureSet& structureSet() const
+    {
+        return structure();
+    }
+    
+    const StructureSet& oldStructure() const
+    {
+        ASSERT(kind() == Transition || kind() == Replace || kind() == Setter);
+        return m_oldStructure;
+    }
+    
+    StructureSet& oldStructure()
+    {
+        ASSERT(kind() == Transition || kind() == Replace || kind() == Setter);
+        return m_oldStructure;
+    }
+    
+    Structure* oldStructureForTransition() const;
+    
+    Structure* newStructure() const
+    {
+        ASSERT(kind() == Transition);
+        return m_newStructure;
+    }
+
+    InferredType::Descriptor requiredType() const
+    {
+        return m_requiredType;
+    }
+
+    bool writesStructures() const;
+    bool reallocatesStorage() const;
+    bool makesCalls() const;
+    
+    const ObjectPropertyConditionSet& conditionSet() const { return m_conditionSet; }
+    
+    // We don't support intrinsics for Setters (it would be sweet if we did) but we need this for templated helpers.
+    Intrinsic intrinsic() const { return NoIntrinsic; }
+    
+    PropertyOffset offset() const
+    {
+        ASSERT(isSet());
+        return m_offset;
+    }
+    
+    CallLinkStatus* callLinkStatus() const
+    {
+        ASSERT(kind() == Setter);
+        return m_callLinkStatus.get();
+    }
+
+    bool attemptToMerge(const PutByIdVariant& other);
+    
+    void dump(PrintStream&) const;
+    void dumpInContext(PrintStream&, DumpContext*) const;
+
+private:
+    bool attemptToMergeTransitionWithReplace(const PutByIdVariant& replace);
+    
+    Kind m_kind;
+    StructureSet m_oldStructure;
+    Structure* m_newStructure;
+    ObjectPropertyConditionSet m_conditionSet;
+    PropertyOffset m_offset;
+    InferredType::Descriptor m_requiredType;
+    std::unique_ptr<CallLinkStatus> m_callLinkStatus;
+};
+
+} // namespace JSC
+
+#endif // PutByIdVariant_h
+