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diff --git a/Source/JavaScriptCore/jit/SnippetOperand.h b/Source/JavaScriptCore/jit/SnippetOperand.h
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+++ b/Source/JavaScriptCore/jit/SnippetOperand.h
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+/*
+ * Copyright (C) 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.
+ */
+
+#pragma once
+
+#if ENABLE(JIT)
+
+#include "ResultType.h"
+
+namespace JSC {
+
+class SnippetOperand {
+    enum ConstOrVarType {
+        Variable,
+        ConstInt32,
+        ConstDouble
+    };
+
+public:
+    SnippetOperand()
+        : m_resultType(ResultType::unknownType())
+    { }
+
+    SnippetOperand(ResultType resultType)
+        : m_resultType(resultType)
+    { }
+
+    bool mightBeNumber() const { return m_resultType.mightBeNumber(); }
+    bool definitelyIsNumber() const { return m_resultType.definitelyIsNumber(); }
+
+    bool isConst() const { return m_type != Variable; }
+    bool isConstInt32() const { return m_type == ConstInt32; }
+    bool isConstDouble() const { return m_type == ConstDouble; }
+    bool isPositiveConstInt32() const { return isConstInt32() && asConstInt32() > 0; }
+
+    int64_t asRawBits() const { return m_val.rawBits; }
+
+    int32_t asConstInt32() const
+    {
+        ASSERT(m_type == ConstInt32);
+        return m_val.int32Val;
+    }
+
+    double asConstDouble() const
+    {
+        ASSERT(m_type == ConstDouble);
+        return m_val.doubleVal;
+    }
+
+    double asConstNumber() const
+    {
+        if (isConstInt32())
+            return asConstInt32();
+        ASSERT(isConstDouble());
+        return asConstDouble();
+    }
+
+    void setConstInt32(int32_t value)
+    {
+        m_type = ConstInt32;
+        m_val.int32Val = value;
+    }
+
+    void setConstDouble(double value)
+    {
+        m_type = ConstDouble;
+        m_val.doubleVal = value;
+    }
+
+private:
+    ResultType m_resultType;
+    ConstOrVarType m_type { Variable };
+    union {
+        int32_t int32Val;
+        double doubleVal;
+        int64_t rawBits;
+    } m_val;
+};
+
+} // namespace JSC
+
+#endif // ENABLE(JIT)