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annotate src/luan/interp/Closure.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 7c08b611125d
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1 package luan.interp;
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3 import luan.LuanFunction;
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4 import luan.LuanState;
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5 import luan.LuanElement;
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6 import luan.LuanException;
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7 import luan.DeepCloner;
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8 import luan.DeepCloneable;
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11 final class Closure extends LuanFunction implements DeepCloneable<Closure> {
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12 private final Chunk chunk;
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13 final UpValue[] upValues;
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14 private final static UpValue[] NO_UP_VALUES = new UpValue[0];
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16 Closure(LuanStateImpl luan,Chunk chunk) {
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17 this.chunk = chunk;
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18 UpValue.Getter[] upValueGetters = chunk.upValueGetters;
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19 if( upValueGetters.length==0 ) {
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20 upValues = NO_UP_VALUES;
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21 } else {
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22 upValues = new UpValue[upValueGetters.length];
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23 for( int i=0; i<upValues.length; i++ ) {
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24 upValues[i] = upValueGetters[i].get(luan);
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25 }
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26 }
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27 }
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29 private Closure(Closure c) {
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30 this.chunk = c.chunk;
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31 this.upValues = c.upValues==NO_UP_VALUES ? NO_UP_VALUES : c.upValues.clone();
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32 }
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34 @Override public Closure shallowClone() {
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35 return new Closure(this);
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36 }
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38 @Override public void deepenClone(Closure clone,DeepCloner cloner) {
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39 cloner.deepenClone(clone.upValues);
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40 }
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42 public Object[] call(LuanState luan,Object[] args) throws LuanException {
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43 return call(this,(LuanStateImpl)luan,args);
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44 }
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46 private static Object[] call(Closure closure,LuanStateImpl luan,Object[] args) throws LuanException {
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47 while(true) {
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48 Chunk chunk = closure.chunk;
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49 Object[] varArgs = null;
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50 if( chunk.isVarArg ) {
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51 if( args.length > chunk.numArgs ) {
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52 varArgs = new Object[ args.length - chunk.numArgs ];
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53 for( int i=0; i<varArgs.length; i++ ) {
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54 varArgs[i] = args[chunk.numArgs+i];
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55 }
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56 } else {
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57 varArgs = LuanFunction.EMPTY_RTN;
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58 }
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59 }
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60 Object[] stack = luan.newFrame(closure,chunk.stackSize,varArgs);
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61 final int n = Math.min(args.length,chunk.numArgs);
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62 for( int i=0; i<n; i++ ) {
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63 stack[i] = args[i];
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64 }
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65 Object[] returnValues;
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66 Closure tailFn;
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67 try {
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68 chunk.block.eval(luan);
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69 } catch(ReturnException e) {
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70 } finally {
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71 returnValues = luan.returnValues;
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72 closure = luan.tailFn;
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73 luan.popFrame();
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74 }
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75 if( closure == null )
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76 return returnValues;
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77 args = returnValues;
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78 }
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79 }
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81 }