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annotate src/luan/interp/LuanStateImpl.java @ 77:4bf3d0c0b6b9

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make LuanState cloneable git-svn-id: https://luan-java.googlecode.com/svn/trunk@78 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Fri, 15 Feb 2013 09:55:17 +0000
parents 8ede219cd111
children 6db8f286fa6c
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diff changeset
1 package luan.interp;
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2
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3 import java.util.List;
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4 import java.util.ArrayList;
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5 import luan.Luan;
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6 import luan.LuanState;
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7 import luan.LuanTable;
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8 import luan.LuanFunction;
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9 import luan.MetatableGetter;
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10 import luan.LuanException;
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11 import luan.LuanElement;
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12 import luan.DeepCloner;
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15 final class LuanStateImpl extends LuanState {
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17 private static class Frame {
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18 final Frame previousFrame;
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19 final Closure closure;
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20 final Object[] stack;
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21 final Object[] varArgs;
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22 UpValue[] downValues = null;
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24 Frame( Frame previousFrame, Closure closure, int stackSize, Object[] varArgs) {
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25 this.previousFrame = previousFrame;
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26 this.closure = closure;
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27 this.stack = new Object[stackSize];
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28 this.varArgs = varArgs;
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29 }
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31 void stackClear(int start,int end) {
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32 if( downValues != null ) {
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33 for( int i=start; i<end; i++ ) {
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34 UpValue downValue = downValues[i];
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35 if( downValue != null ) {
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36 downValue.close();
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37 downValues[i] = null;
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38 }
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39 }
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40 }
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41 for( int i=start; i<end; i++ ) {
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42 stack[i] = null;
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43 }
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44 }
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46 UpValue getUpValue(int index) {
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47 if( downValues==null )
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48 downValues = new UpValue[stack.length];
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49 if( downValues[index] == null )
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50 downValues[index] = new UpValue(stack,index);
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51 return downValues[index];
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52 }
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53 }
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55 private Frame frame = null;
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56 Object[] returnValues = LuanFunction.EMPTY_RTN;
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57 Closure tailFn;
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59 public LuanStateImpl() {}
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60
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61 private LuanStateImpl(LuanStateImpl luan) {
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62 super(luan);
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63 }
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64
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65 @Override public LuanState shallowClone() {
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66 if( frame != null )
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67 throw new IllegalStateException("frame isn't null");
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68 return new LuanStateImpl(this);
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69 }
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71 // returns stack
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72 Object[] newFrame(Closure closure, int stackSize, Object[] varArgs) {
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73 frame = new Frame(frame,closure,stackSize,varArgs);
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74 return frame.stack;
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75 }
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77 void popFrame() {
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78 returnValues = LuanFunction.EMPTY_RTN;
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79 tailFn = null;
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80 frame = frame.previousFrame;
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81 }
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83 Object stackGet(int index) {
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84 return frame.stack[index];
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85 }
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86
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87 void stackSet(int index,Object value) {
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88 frame.stack[index] = value;
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89 }
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91 void stackClear(int start,int end) {
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92 frame.stackClear(start,end);
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93 }
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95 Object[] varArgs() {
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96 return frame.varArgs;
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97 }
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99 Closure closure() {
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100 return frame.closure;
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101 }
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102
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103 UpValue getUpValue(int index) {
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104 return frame.getUpValue(index);
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105 }
77
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106
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107
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108 final Object arithmetic(LuanElement el,String op,Object o1,Object o2) throws LuanException {
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109 LuanFunction fn = getBinHandler(el,op,o1,o2);
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110 if( fn != null )
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111 return Luan.first(call(fn,el,op,o1,o2));
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112 String type = Luan.toNumber(o1)==null ? Luan.type(o1) : Luan.type(o2);
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113 throw new LuanException(this,el,"attempt to perform arithmetic on a "+type+" value");
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114 }
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115
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116 }