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annotate src/luan/interp/LuanStateImpl.java @ 49:8ede219cd111

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add WebShell git-svn-id: https://luan-java.googlecode.com/svn/trunk@50 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Fri, 28 Dec 2012 19:35:04 +0000
parents 64ecb7a3aad7
children 4bf3d0c0b6b9
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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
7a2cdbc5767f add LuaState
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14 final class LuanStateImpl extends LuanState {
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16 final Object arithmetic(LuanElement el,String op,Object o1,Object o2) throws LuanException {
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17 LuanFunction fn = getBinHandler(el,op,o1,o2);
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18 if( fn != null )
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19 return Luan.first(call(fn,el,op,o1,o2));
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20 String type = Luan.toNumber(o1)==null ? Luan.type(o1) : Luan.type(o2);
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21 throw new LuanException(this,el,"attempt to perform arithmetic on a "+type+" value");
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22 }
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25 private static class Frame {
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26 final Frame previousFrame;
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27 final Closure closure;
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28 final Object[] stack;
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29 final Object[] varArgs;
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30 UpValue[] downValues = null;
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32 Frame( Frame previousFrame, Closure closure, int stackSize, Object[] varArgs) {
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33 this.previousFrame = previousFrame;
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34 this.closure = closure;
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35 this.stack = new Object[stackSize];
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36 this.varArgs = varArgs;
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37 }
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39 void stackClear(int start,int end) {
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40 if( downValues != null ) {
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41 for( int i=start; i<end; i++ ) {
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42 UpValue downValue = downValues[i];
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43 if( downValue != null ) {
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44 downValue.close();
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45 downValues[i] = null;
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46 }
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47 }
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48 }
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49 for( int i=start; i<end; i++ ) {
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50 stack[i] = null;
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51 }
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52 }
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54 UpValue getUpValue(int index) {
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55 if( downValues==null )
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56 downValues = new UpValue[stack.length];
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57 if( downValues[index] == null )
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58 downValues[index] = new UpValue(stack,index);
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59 return downValues[index];
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60 }
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61 }
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62
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63 private Frame frame = null;
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64 Object[] returnValues = LuanFunction.EMPTY_RTN;
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65 Closure tailFn;
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67 // returns stack
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68 Object[] newFrame(Closure closure, int stackSize, Object[] varArgs) {
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69 frame = new Frame(frame,closure,stackSize,varArgs);
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70 return frame.stack;
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71 }
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73 void popFrame() {
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74 returnValues = LuanFunction.EMPTY_RTN;
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75 tailFn = null;
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76 frame = frame.previousFrame;
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77 }
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79 Object stackGet(int index) {
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80 return frame.stack[index];
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81 }
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83 void stackSet(int index,Object value) {
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84 frame.stack[index] = value;
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85 }
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86
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87 void stackClear(int start,int end) {
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88 frame.stackClear(start,end);
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89 }
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91 Object[] varArgs() {
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92 return frame.varArgs;
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93 }
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95 Closure closure() {
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96 return frame.closure;
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97 }
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99 UpValue getUpValue(int index) {
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100 return frame.getUpValue(index);
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7a2cdbc5767f add LuaState
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
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102 }