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annotate Jint.Runtime/VM/Frame.cs @ 5:cb13da6e3349

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simple loop test
author cin
date Mon, 28 Oct 2013 00:49:15 +0400
parents 1ae5b10f7a10
children a6329b092499
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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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19
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20 /// <summary>
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21 /// Return register at the specified index.
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22 /// </summary>
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23 /// <param name="index">The index of the register</param>
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24 /// <returns>The register.</returns>
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25 public AbstractBox this[int index] {
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26 get {
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27 return m_registers[index];
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28 }
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29 set {
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30 m_registers[index] = value;
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31 }
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32 }
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33
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34 /// <summary>
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35 /// Extracts value stored in the register specified by the index.
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36 /// </summary>
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37 /// <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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38 /// <typeparam name="T">The type of the value stored in the register.</typeparam>
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39 /// <param name="index">The index of the register.</param>
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40 /// <returns>The value stored in the register.</returns>
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41 public T GetValue<T>(int index) {
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42 return ((Box<T>)m_registers[index]).holdingValue;
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43 }
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44
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45 /// <summary>
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46 /// Stores a new value in the register specified by the index.
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47 /// </summary>
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48 /// <remarks>
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49 /// If the previous value has the same type as the value being stored in the register,
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50 /// the new value will replace the old one, otherwise the register will be reallocated to
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51 /// store the new value.
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52 /// </remarks>
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53 /// <typeparam name="T">The type of the value being stored</typeparam>
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54 /// <param name="index">The index of the register where the value will be stored</param>
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55 /// <param name="value">The value to be stored in the register</param>
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56 public void SetValue<T>(int index, T value) {
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57 var reg = m_registers[index] as Box<T>;
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58 if (reg == null || reg.holdingType != typeof(T))
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59 m_registers[index] = m_runtime.BoxValue(value);
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60 else
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61 reg.holdingValue = value;
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62 }
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63
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64 public T GetConverted<T>(int index) {
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65 var reg = m_registers[index];
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66
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67 if (reg.holdingType == typeof(T))
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68 return ((Box<T>)reg).holdingValue;
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69 else
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70 return reg.Convert<T>();
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71 }
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72 }
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73 }