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diff --git a/Source/JavaScriptCore/dfg/DFGMultiGetByOffsetData.h b/Source/JavaScriptCore/dfg/DFGMultiGetByOffsetData.h
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+++ b/Source/JavaScriptCore/dfg/DFGMultiGetByOffsetData.h
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+/*
+ * Copyright (C) 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 DFGMultiGetByOffsetData_h
+#define DFGMultiGetByOffsetData_h
+
+#if ENABLE(DFG_JIT)
+
+#include "DumpContext.h"
+#include "JSObject.h"
+#include "StructureSet.h"
+
+namespace JSC { namespace DFG {
+
+class FrozenValue;
+
+class GetByOffsetMethod {
+public:
+    enum Kind {
+        Invalid,
+        Constant,
+        Load,
+        LoadFromPrototype
+    };
+    
+    GetByOffsetMethod()
+        : m_kind(Invalid)
+    {
+    }
+    
+    static GetByOffsetMethod constant(FrozenValue* value)
+    {
+        GetByOffsetMethod result;
+        result.m_kind = Constant;
+        result.u.constant = value;
+        return result;
+    }
+    
+    static GetByOffsetMethod load(PropertyOffset offset)
+    {
+        GetByOffsetMethod result;
+        result.m_kind = Load;
+        result.u.load.offset = offset;
+        return result;
+    }
+    
+    static GetByOffsetMethod loadFromPrototype(FrozenValue* prototype, PropertyOffset offset)
+    {
+        GetByOffsetMethod result;
+        result.m_kind = LoadFromPrototype;
+        result.u.load.prototype = prototype;
+        result.u.load.offset = offset;
+        return result;
+    }
+    
+    bool operator!() const { return m_kind == Invalid; }
+    
+    Kind kind() const { return m_kind; }
+    
+    FrozenValue* constant() const
+    {
+        ASSERT(kind() == Constant);
+        return u.constant;
+    }
+    
+    FrozenValue* prototype() const
+    {
+        ASSERT(kind() == LoadFromPrototype);
+        return u.load.prototype;
+    }
+    
+    PropertyOffset offset() const
+    {
+        ASSERT(kind() == Load || kind() == LoadFromPrototype);
+        return u.load.offset;
+    }
+    
+    void dumpInContext(PrintStream&, DumpContext*) const;
+    void dump(PrintStream&) const;
+    
+private:
+    union {
+        FrozenValue* constant;
+        struct {
+            FrozenValue* prototype;
+            PropertyOffset offset;
+        } load;
+    } u;
+    Kind m_kind;
+};
+
+class MultiGetByOffsetCase {
+public:
+    MultiGetByOffsetCase()
+    {
+    }
+    
+    MultiGetByOffsetCase(const StructureSet& set, const GetByOffsetMethod& method)
+        : m_set(set)
+        , m_method(method)
+    {
+    }
+    
+    StructureSet& set() { return m_set; }
+    const StructureSet& set() const { return m_set; }
+    const GetByOffsetMethod& method() const { return m_method; }
+    
+    void dumpInContext(PrintStream&, DumpContext*) const;
+    void dump(PrintStream&) const;
+
+private:
+    StructureSet m_set;
+    GetByOffsetMethod m_method;
+};
+
+struct MultiGetByOffsetData {
+    unsigned identifierNumber;
+    Vector<MultiGetByOffsetCase, 2> cases;
+};
+
+} } // namespace JSC::DFG
+
+namespace WTF {
+
+void printInternal(PrintStream&, JSC::DFG::GetByOffsetMethod::Kind);
+
+} // namespace WTF
+
+#endif // ENABLE(DFG_JIT)
+
+#endif // DFGMultiGetByOffsetData_h
+