--- a/Jint.Runtime/VM/Frame.cs	Mon Oct 28 00:49:15 2013 +0400
+++ b/Jint.Runtime/VM/Frame.cs	Wed Oct 30 17:38:35 2013 +0400
@@ -1,73 +1,77 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-
-namespace Jint.Runtime.VM {
-    class Frame {
-        AbstractBox[] m_registers;
-        RuntimeContext m_runtime;
-
-        public Frame(int size, RuntimeContext runtime) {
-            if (runtime == null)
-                throw new ArgumentNullException("runtime");
-            if (size < 0)
-                throw new ArgumentOutOfRangeException("size");
-            m_runtime = runtime;
-            m_registers = new AbstractBox[size];
-        }
-
-        /// <summary>
-        /// Return register at the specified index.
-        /// </summary>
-        /// <param name="index">The index of the register</param>
-        /// <returns>The register.</returns>
-        public AbstractBox this[int index] {
-            get {
-                return m_registers[index];
-            }
-            set {
-                m_registers[index] = value;
-            }
-        }
-
-        /// <summary>
-        /// Extracts value stored in the register specified by the index.
-        /// </summary>
-        /// <remarks>This method doesn't do any cast, if the specified type isn't the same as the type of the stored value a type cast exception will occur.</remarks>
-        /// <typeparam name="T">The type of the value stored in the register.</typeparam>
-        /// <param name="index">The index of the register.</param>
-        /// <returns>The value stored in the register.</returns>
-        public T GetValue<T>(int index) {
-            return ((Box<T>)m_registers[index]).holdingValue;
-        }
-
-        /// <summary>
-        /// Stores a new value in the register specified by the index.
-        /// </summary>
-        /// <remarks>
-        /// If the previous value has the same type as the value being stored in the register,
-        /// the new value will replace the old one, otherwise the register will be reallocated to
-        /// store the new value.
-        /// </remarks>
-        /// <typeparam name="T">The type of the value being stored</typeparam>
-        /// <param name="index">The index of the register where the value will be stored</param>
-        /// <param name="value">The value to be stored in the register</param>
-        public void SetValue<T>(int index, T value) {
-            var reg = m_registers[index] as Box<T>;
-            if (reg == null || reg.holdingType != typeof(T))
-                m_registers[index] = m_runtime.BoxValue(value);
-            else
-                reg.holdingValue = value;
-        }
-
-        public T GetConverted<T>(int index) {
-            var reg = m_registers[index];
-
-            if (reg.holdingType == typeof(T))
-                return ((Box<T>)reg).holdingValue;
-            else
-                return reg.Convert<T>();
-        }
-    }
-}
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace Jint.Runtime.VM {
+    class Frame {
+        AbstractBox[] m_registers;
+        RuntimeContext m_runtime;
+
+		public const int ThisRegister = 0;
+		public const int ScopeRegister = 1;
+		public const int FirstVarRegsiter = 2;
+
+        public Frame(int size, RuntimeContext runtime) {
+            if (runtime == null)
+                throw new ArgumentNullException("runtime");
+            if (size < 0)
+                throw new ArgumentOutOfRangeException("size");
+            m_runtime = runtime;
+            m_registers = new AbstractBox[size];
+        }
+
+        /// <summary>
+        /// Return register at the specified index.
+        /// </summary>
+        /// <param name="index">The index of the register</param>
+        /// <returns>The register.</returns>
+        public AbstractBox this[int index] {
+            get {
+                return m_registers[index];
+            }
+            set {
+                m_registers[index] = value;
+            }
+        }
+
+        /// <summary>
+        /// Extracts value stored in the register specified by the index.
+        /// </summary>
+        /// <remarks>This method doesn't do any cast, if the specified type isn't the same as the type of the stored value a type cast exception will occur.</remarks>
+        /// <typeparam name="T">The type of the value stored in the register.</typeparam>
+        /// <param name="index">The index of the register.</param>
+        /// <returns>The value stored in the register.</returns>
+        public T GetValue<T>(int index) {
+            return ((Box<T>)m_registers[index]).holdingValue;
+        }
+
+        /// <summary>
+        /// Stores a new value in the register specified by the index.
+        /// </summary>
+        /// <remarks>
+        /// If the previous value has the same type as the value being stored in the register,
+        /// the new value will replace the old one, otherwise the register will be reallocated to
+        /// store the new value.
+        /// </remarks>
+        /// <typeparam name="T">The type of the value being stored</typeparam>
+        /// <param name="index">The index of the register where the value will be stored</param>
+        /// <param name="value">The value to be stored in the register</param>
+        public void SetValue<T>(int index, T value) {
+            var reg = m_registers[index] as Box<T>;
+            if (reg == null || reg.holdingType != typeof(T))
+                m_registers[index] = m_runtime.BoxValue(value);
+            else
+                reg.holdingValue = value;
+        }
+
+        public T GetConverted<T>(int index) {
+            var reg = m_registers[index];
+
+            if (reg.holdingType == typeof(T))
+                return ((Box<T>)reg).holdingValue;
+            else
+                return reg.Convert<T>();
+        }
+    }
+}