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annotate src/luan/interp/Closure.java @ 86:6db8f286fa6c

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_ENV is per module, not global git-svn-id: https://luan-java.googlecode.com/svn/trunk@87 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Wed, 27 Feb 2013 08:03:51 +0000
parents 7c08b611125d
children 2428ecfed375
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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 FnDef fnDef;
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13 private UpValue[] upValues;
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15 Closure(LuanStateImpl luan,FnDef fnDef) throws LuanException {
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16 this.fnDef = fnDef;
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17 UpValue.Getter[] upValueGetters = fnDef.upValueGetters;
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18 upValues = new UpValue[upValueGetters.length];
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19 for( int i=0; i<upValues.length; i++ ) {
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20 upValues[i] = upValueGetters[i].get(luan);
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21 }
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22 }
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24 private Closure(Closure c) {
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25 this.fnDef = c.fnDef;
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26 }
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28 @Override public Closure shallowClone() {
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29 return new Closure(this);
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30 }
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32 @Override public void deepenClone(Closure clone,DeepCloner cloner) {
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33 clone.upValues = cloner.deepClone(upValues);
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34 }
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36 UpValue[] upValues() {
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37 return upValues;
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38 }
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40 public Object[] call(LuanState luan,Object[] args) throws LuanException {
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41 return call(this,(LuanStateImpl)luan,args);
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42 }
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44 private static Object[] call(Closure closure,LuanStateImpl luan,Object[] args) throws LuanException {
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45 while(true) {
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46 FnDef fnDef = closure.fnDef;
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47 Object[] varArgs = null;
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48 if( fnDef.isVarArg ) {
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49 if( args.length > fnDef.numArgs ) {
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50 varArgs = new Object[ args.length - fnDef.numArgs ];
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51 for( int i=0; i<varArgs.length; i++ ) {
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52 varArgs[i] = args[fnDef.numArgs+i];
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53 }
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54 } else {
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55 varArgs = LuanFunction.EMPTY;
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56 }
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57 }
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58 Object[] stack = luan.newFrame(closure,fnDef.stackSize,varArgs);
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59 final int n = Math.min(args.length,fnDef.numArgs);
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60 for( int i=0; i<n; i++ ) {
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61 stack[i] = args[i];
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62 }
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63 Object[] returnValues;
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64 Closure tailFn;
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65 try {
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66 fnDef.block.eval(luan);
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67 } catch(ReturnException e) {
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68 } finally {
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69 returnValues = luan.returnValues;
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70 closure = luan.tailFn;
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71 luan.popFrame();
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72 }
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73 if( closure == null )
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74 return returnValues;
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75 args = returnValues;
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76 }
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77 }
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79 }