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diff --git a/Source/JavaScriptCore/b3/B3CheckValue.h b/Source/JavaScriptCore/b3/B3CheckValue.h
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+++ b/Source/JavaScriptCore/b3/B3CheckValue.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. 
+ */
+
+#ifndef B3CheckValue_h
+#define B3CheckValue_h
+
+#if ENABLE(B3_JIT)
+
+#include "B3StackmapValue.h"
+
+namespace JSC { namespace B3 {
+
+class CheckValue : public StackmapValue {
+public:
+    static bool accepts(Opcode opcode)
+    {
+        switch (opcode) {
+        case CheckAdd:
+        case CheckSub:
+        case CheckMul:
+        case Check:
+            return true;
+        default:
+            return false;
+        }
+    }
+
+    ~CheckValue();
+
+    void convertToAdd();
+
+protected:
+    Value* cloneImpl() const override;
+    
+private:
+    friend class Procedure;
+
+    // Use this form for CheckAdd, CheckSub, and CheckMul.
+    JS_EXPORT_PRIVATE CheckValue(Opcode, Origin, Value* left, Value* right);
+
+    // Use this form for Check.
+    JS_EXPORT_PRIVATE CheckValue(Opcode, Origin, Value* predicate);
+};
+
+} } // namespace JSC::B3
+
+#endif // ENABLE(B3_JIT)
+
+#endif // B3CheckValue_h
+
+