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diff --git a/Source/JavaScriptCore/bytecode/Operands.h b/Source/JavaScriptCore/bytecode/Operands.h
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+++ b/Source/JavaScriptCore/bytecode/Operands.h
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+/*
+ * Copyright (C) 2011, 2012 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 Operands_h
+#define Operands_h
+
+#include "CallFrame.h"
+#include "JSObject.h"
+#include "ScopeChain.h"
+#include <wtf/Vector.h>
+
+namespace JSC {
+
+// argument 0 is 'this'.
+inline bool operandIsArgument(int operand) { return operand < 0; }
+inline int operandToArgument(int operand) { return -operand + CallFrame::thisArgumentOffset(); }
+inline int argumentToOperand(int argument) { return -argument + CallFrame::thisArgumentOffset(); }
+
+template<typename T> struct OperandValueTraits;
+
+template<typename T>
+struct OperandValueTraits {
+    static T defaultValue() { return T(); }
+    static void dump(const T& value, FILE* out) { value.dump(out); }
+};
+
+template<typename T, typename Traits = OperandValueTraits<T> >
+class Operands {
+public:
+    Operands() { }
+    
+    explicit Operands(size_t numArguments, size_t numLocals)
+    {
+        m_arguments.fill(Traits::defaultValue(), numArguments);
+        m_locals.fill(Traits::defaultValue(), numLocals);
+    }
+    
+    size_t numberOfArguments() const { return m_arguments.size(); }
+    size_t numberOfLocals() const { return m_locals.size(); }
+    
+    T& argument(size_t idx) { return m_arguments[idx]; }
+    const T& argument(size_t idx) const { return m_arguments[idx]; }
+    
+    T& local(size_t idx) { return m_locals[idx]; }
+    const T& local(size_t idx) const { return m_locals[idx]; }
+    
+    void ensureLocals(size_t size)
+    {
+        if (size <= m_locals.size())
+            return;
+
+        size_t oldSize = m_locals.size();
+        m_locals.resize(size);
+        for (size_t i = oldSize; i < m_locals.size(); ++i)
+            m_locals[i] = Traits::defaultValue();
+    }
+    
+    void setLocal(size_t idx, const T& value)
+    {
+        ensureLocals(idx + 1);
+        
+        m_locals[idx] = value;
+    }
+    
+    T getLocal(size_t idx)
+    {
+        if (idx >= m_locals.size())
+            return Traits::defaultValue();
+        return m_locals[idx];
+    }
+    
+    void setArgumentFirstTime(size_t idx, const T& value)
+    {
+        ASSERT(m_arguments[idx] == Traits::defaultValue());
+        argument(idx) = value;
+    }
+    
+    void setLocalFirstTime(size_t idx, const T& value)
+    {
+        ASSERT(idx >= m_locals.size() || m_locals[idx] == Traits::defaultValue());
+        setLocal(idx, value);
+    }
+    
+    T& operand(int operand)
+    {
+        if (operandIsArgument(operand)) {
+            int argument = operandToArgument(operand);
+            return m_arguments[argument];
+        }
+        
+        return m_locals[operand];
+    }
+    
+    const T& operand(int operand) const { return const_cast<const T&>(const_cast<Operands*>(this)->operand(operand)); }
+    
+    void setOperand(int operand, const T& value)
+    {
+        if (operandIsArgument(operand)) {
+            int argument = operandToArgument(operand);
+            m_arguments[argument] = value;
+            return;
+        }
+        
+        setLocal(operand, value);
+    }
+    
+    void clear()
+    {
+        for (size_t i = 0; i < m_arguments.size(); ++i)
+            m_arguments[i] = Traits::defaultValue();
+        for (size_t i = 0; i < m_locals.size(); ++i)
+            m_locals[i] = Traits::defaultValue();
+    }
+    
+private:
+    Vector<T, 8> m_arguments;
+    Vector<T, 16> m_locals;
+};
+
+template<typename T, typename Traits>
+void dumpOperands(Operands<T, Traits>& operands, FILE* out)
+{
+    for (size_t argument = 0; argument < operands.numberOfArguments(); ++argument) {
+        if (argument)
+            fprintf(out, " ");
+        Traits::dump(operands.argument(argument), out);
+    }
+    fprintf(out, " : ");
+    for (size_t local = 0; local < operands.numberOfLocals(); ++local) {
+        if (local)
+            fprintf(out, " ");
+        Traits::dump(operands.local(local), out);
+    }
+}
+
+} // namespace JSC
+
+#endif // Operands_h
+