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1 using System;
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2 using System.Collections.Generic;
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3
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4 namespace Jint.Runtime.VM
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5 {
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6 class FunctionBuidler
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7 {
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8 Scope m_parentScope;
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9
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10 /// <summary>
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11 /// maps local variable names to the registers
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12 /// </summary>
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13 Dictionary<string,int> m_locals;
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14
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15 /// <summary>
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16 /// maps formal parameters to local variables
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17 /// </summary>
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18 int[] m_formalParameters;
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19
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20 int m_frameSize;
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21
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22 IInstruction m_code;
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23
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24 RuntimeContext m_runtime;
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25
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26 public FunctionBuilder (string[] argumentNames, RuntimeContext runtime, Scope parentScope)
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27 {
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28 m_parentScope;
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29 m_frameSize = 2; // reserve for this and scope
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30
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31 m_locals = new Dictionary<string,int>();
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32
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33 if (argumentNames!= null) {
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34 m_formalParameters = new int[argumentNames.Length];
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35 for(int i = 0; i < argumentNames.Length; i++)
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36 m_formalParameters[i] = AllocVariable(argumentNames[i]);
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37 }
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38 }
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39
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40 // all vars should be allocated before temp registers
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41 public int AllocVariable(string name) {
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42 int id;
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43
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44 if (m_locals.TryGetValue (name, out id))
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45 return id;
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46
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47 id = m_frameSize++;
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48 m_locals [name] = id;
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49 return id;
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50 }
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51
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52 public int AllocateRegister() {
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53 return m_frameSize++;
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54 }
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55
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56 public void Invoke (object that, object[] args) {
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57 var frame = new Frame (m_frameSize, m_runtime);
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58 var scope = new Scope (m_locals, frame, m_declaringScope);
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59 frame.SetValue (Frame.ThisRegister, that);
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60 frame.SetValue (Frame.ScopeRegister, scope);
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61
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62 var paramLen = Math.Min (m_formalParameters.Length, args.Length);
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63
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64 for (int i=0; i< paramLen; i++)
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65 frame.SetValue (m_formalParameters [i], args [i]);
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66 }
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67
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68 }
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69 }
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70
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