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diff --git a/Source/JavaScriptCore/dfg/DFGOpInfo.h b/Source/JavaScriptCore/dfg/DFGOpInfo.h
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+++ b/Source/JavaScriptCore/dfg/DFGOpInfo.h
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+/*
+ * Copyright (C) 2016-2017 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
+
+#include "DFGRegisteredStructure.h"
+#include "HeapCell.h"
+#include <wtf/StdLibExtras.h>
+
+#if ENABLE(DFG_JIT)
+
+namespace JSC { namespace DFG {
+
+// This type used in passing an immediate argument to Node constructor;
+// distinguishes an immediate value (typically an index into a CodeBlock data structure - 
+// a constant index, argument, or identifier) from a Node*.
+struct OpInfo {
+    OpInfo() : m_value(0) { }
+    explicit OpInfo(int32_t value) : m_value(static_cast<uint64_t>(value)) { }
+    explicit OpInfo(uint32_t value) : m_value(static_cast<uint64_t>(value)) { }
+    explicit OpInfo(uint64_t value) : m_value(static_cast<uint64_t>(value)) { }
+#if OS(DARWIN)
+    explicit OpInfo(uintptr_t value) : m_value(static_cast<uint64_t>(value)) { }
+#endif
+    explicit OpInfo(RegisteredStructure structure) : m_value(static_cast<uint64_t>(bitwise_cast<uintptr_t>(structure))) { }
+
+
+    template <typename T>
+    explicit OpInfo(T* ptr)
+    {
+        static_assert(!std::is_base_of<HeapCell, T>::value, "To make an OpInfo with a cell in it, the cell must be registered or frozen.");
+        static_assert(!std::is_base_of<StructureSet, T>::value, "To make an OpInfo with a structure set in, make sure to use RegisteredStructureSet.");
+        m_value = static_cast<uint64_t>(reinterpret_cast<uintptr_t>(ptr));
+    }
+
+    uint64_t m_value;
+};
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)