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diff --git a/Source/JavaScriptCore/bytecode/GetByIdVariant.h b/Source/JavaScriptCore/bytecode/GetByIdVariant.h
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index 000000000..03a1e566f
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+++ b/Source/JavaScriptCore/bytecode/GetByIdVariant.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 GetByIdVariant_h
+#define GetByIdVariant_h
+
+#include "CallLinkStatus.h"
+#include "JSCJSValue.h"
+#include "ObjectPropertyConditionSet.h"
+#include "PropertyOffset.h"
+#include "StructureSet.h"
+
+namespace JSC {
+
+class CallLinkStatus;
+class GetByIdStatus;
+struct DumpContext;
+
+class GetByIdVariant {
+public:
+    GetByIdVariant(
+        const StructureSet& structureSet = StructureSet(), PropertyOffset offset = invalidOffset,
+        const ObjectPropertyConditionSet& = ObjectPropertyConditionSet(),
+        std::unique_ptr<CallLinkStatus> = nullptr,
+        JSFunction* = nullptr);
+
+    ~GetByIdVariant();
+    
+    GetByIdVariant(const GetByIdVariant&);
+    GetByIdVariant& operator=(const GetByIdVariant&);
+    
+    bool isSet() const { return !!m_structureSet.size(); }
+    bool operator!() const { return !isSet(); }
+    const StructureSet& structureSet() const { return m_structureSet; }
+    StructureSet& structureSet() { return m_structureSet; }
+
+    // A non-empty condition set means that this is a prototype load.
+    const ObjectPropertyConditionSet& conditionSet() const { return m_conditionSet; }
+    
+    PropertyOffset offset() const { return m_offset; }
+    CallLinkStatus* callLinkStatus() const { return m_callLinkStatus.get(); }
+    JSFunction* intrinsicFunction() const { return m_intrinsicFunction; }
+    Intrinsic intrinsic() const { return m_intrinsicFunction ? m_intrinsicFunction->intrinsic() : NoIntrinsic; }
+
+    bool attemptToMerge(const GetByIdVariant& other);
+    
+    void dump(PrintStream&) const;
+    void dumpInContext(PrintStream&, DumpContext*) const;
+    
+private:
+    friend class GetByIdStatus;
+
+    bool canMergeIntrinsicStructures(const GetByIdVariant&) const;
+    
+    StructureSet m_structureSet;
+    ObjectPropertyConditionSet m_conditionSet;
+    PropertyOffset m_offset;
+    std::unique_ptr<CallLinkStatus> m_callLinkStatus;
+    JSFunction* m_intrinsicFunction;
+};
+
+} // namespace JSC
+
+#endif // GetByIdVariant_h
+