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annotate Jint.Runtime/VM/Frame.cs @ 4:1ae5b10f7a10

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Code cleanup, minor refactoring
author cin
date Sun, 27 Oct 2013 21:20:59 +0400
parents aced2ae9957f
children cb13da6e3349
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1 using System;
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2 using System.Collections.Generic;
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3 using System.Linq;
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4 using System.Text;
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5
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6 namespace Jint.Runtime.VM {
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7 class Frame {
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8 AbstractBox[] m_registers;
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9 RuntimeContext m_runtime;
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10
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11 public Frame(int size, RuntimeContext runtime) {
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12 if (runtime == null)
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13 throw new ArgumentNullException("runtime");
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14 if (size < 0)
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15 throw new ArgumentOutOfRangeException("size");
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16 m_runtime = runtime;
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17 m_registers = new AbstractBox[size];
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18 }
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20 public AbstractBox this[int index] {
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21 get {
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22 return m_registers[index];
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23 }
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24 set {
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25 m_registers[index] = value;
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26 }
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27 }
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28
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29 /// <summary>
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30 /// Extracts value stored in the registry specified by the index.
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31 /// </summary>
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32 /// <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>
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33 /// <typeparam name="T">The type of the value stored in the registry.</typeparam>
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34 /// <param name="index">The index of the registry.</param>
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35 /// <returns>The value stored in the registry.</returns>
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36 public T GetValue<T>(int index) {
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37 return ((Box<T>)m_registers[index]).holdingValue;
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38 }
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39
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40 /// <summary>
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41 /// Stores a new value in the register specified by the index.
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42 /// </summary>
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43 /// <remarks>
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44 /// If the previous value has the same type as the value being stored in the registry,
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45 /// the new value will replace the old one, otherwise the registry will be reallocated to
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46 /// store the new value.
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47 /// </remarks>
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48 /// <typeparam name="T">The type of the value being stored</typeparam>
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49 /// <param name="index">The index of the registry where the value will be stored</param>
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50 /// <param name="value">The value to be stored in the registry</param>
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51 public void SetValue<T>(int index, T value) {
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52 var reg = m_registers[index] as Box<T>;
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53 if (reg == null || reg.holdingType != typeof(T))
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54 m_registers[index] = m_runtime.BoxValue(value);
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55 else
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56 reg.holdingValue = value;
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57 }
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58 }
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59 }