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diff --git a/Source/JavaScriptCore/dfg/DFGUseKind.h b/Source/JavaScriptCore/dfg/DFGUseKind.h
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+++ b/Source/JavaScriptCore/dfg/DFGUseKind.h
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+/*
+ * Copyright (C) 2013 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 DFGUseKind_h
+#define DFGUseKind_h
+
+#include <wtf/Platform.h>
+
+#if ENABLE(DFG_JIT)
+
+#include "SpeculatedType.h"
+#include <wtf/PrintStream.h>
+
+namespace JSC { namespace DFG {
+
+enum UseKind {
+    UntypedUse,
+    Int32Use,
+    KnownInt32Use,
+    RealNumberUse,
+    NumberUse,
+    KnownNumberUse,
+    BooleanUse,
+    CellUse,
+    KnownCellUse,
+    ObjectUse,
+    ObjectOrOtherUse,
+    StringUse,
+    KnownStringUse,
+    StringObjectUse,
+    StringOrStringObjectUse,
+    NotCellUse,
+    OtherUse,
+    LastUseKind // Must always be the last entry in the enum, as it is used to denote the number of enum elements.
+};
+
+ALWAYS_INLINE SpeculatedType typeFilterFor(UseKind useKind)
+{
+    switch (useKind) {
+    case UntypedUse:
+        return SpecEmptyOrTop; // TOP isn't good enough; untyped uses may use the normally unseen empty value, in the case of lazy registers.
+    case Int32Use:
+    case KnownInt32Use:
+        return SpecInt32;
+    case RealNumberUse:
+        return SpecRealNumber;
+    case NumberUse:
+    case KnownNumberUse:
+        return SpecNumber;
+    case BooleanUse:
+        return SpecBoolean;
+    case CellUse:
+    case KnownCellUse:
+        return SpecCell;
+    case ObjectUse:
+        return SpecObject;
+    case ObjectOrOtherUse:
+        return SpecObject | SpecOther;
+    case StringUse:
+    case KnownStringUse:
+        return SpecString;
+    case StringObjectUse:
+        return SpecStringObject;
+    case StringOrStringObjectUse:
+        return SpecString | SpecStringObject;
+    case NotCellUse:
+        return ~SpecCell;
+    case OtherUse:
+        return SpecOther;
+    default:
+        RELEASE_ASSERT_NOT_REACHED();
+        return SpecTop;
+    }
+}
+
+ALWAYS_INLINE bool isNumerical(UseKind kind)
+{
+    switch (kind) {
+    case Int32Use:
+    case KnownInt32Use:
+    case RealNumberUse:
+    case NumberUse:
+        return true;
+    default:
+        return false;
+    }
+}
+
+} } // namespace JSC::DFG
+
+namespace WTF {
+
+void printInternal(PrintStream&, JSC::DFG::UseKind);
+
+} // namespace WTF
+
+#endif // ENABLE(DFG_JIT)
+
+#endif // DFGUseKind_h
+