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diff --git a/Source/JavaScriptCore/b3/B3UpsilonValue.h b/Source/JavaScriptCore/b3/B3UpsilonValue.h
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+++ b/Source/JavaScriptCore/b3/B3UpsilonValue.h
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+/*
+ * Copyright (C) 2015-2016 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. 
+ */
+
+#pragma once
+
+#if ENABLE(B3_JIT)
+
+#include "B3Value.h"
+
+namespace JSC { namespace B3 {
+
+class JS_EXPORT_PRIVATE UpsilonValue : public Value {
+public:
+    static bool accepts(Kind kind) { return kind == Upsilon; }
+
+    ~UpsilonValue();
+
+    Value* phi() const { return m_phi; }
+    void setPhi(Value* phi)
+    {
+        ASSERT(child(0)->type() == phi->type());
+        ASSERT(phi->opcode() == Phi);
+        m_phi = phi;
+    }
+
+protected:
+    void dumpMeta(CommaPrinter&, PrintStream&) const override;
+
+    Value* cloneImpl() const override;
+
+private:
+    friend class Procedure;
+
+    // Note that passing the Phi during construction is optional. A valid pattern is to first create
+    // the Upsilons without the Phi, then create the Phi, then go back and tell the Upsilons about
+    // the Phi. This allows you to emit code in its natural order.
+    UpsilonValue(Origin origin, Value* value, Value* phi = nullptr)
+        : Value(CheckedOpcode, Upsilon, Void, origin, value)
+        , m_phi(phi)
+    {
+        if (phi)
+            ASSERT(value->type() == phi->type());
+    }
+
+    Value* m_phi;
+};
+
+} } // namespace JSC::B3
+
+#endif // ENABLE(B3_JIT)