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annotate core/src/luan/impl/Closure.java @ 659:f1150518c467

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remove tail recursion
author Franklin Schmidt <fschmidt@gmail.com>
date Tue, 05 Apr 2016 20:30:42 -0600
parents cdc70de628b5
children b438a47196bc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 package luan.impl;
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3 import luan.Luan;
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4 import luan.LuanFunction;
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5 import luan.LuanState;
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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 {
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12 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 this.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(DeepCloneable clone,DeepCloner cloner) {
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33 ((Closure)clone).upValues = (UpValue[])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 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
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41 try {
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42 return call(this,(LuanStateImpl)luan,args);
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43 } catch(StackOverflowError e) {
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44 throw new LuanException( "stack overflow", e );
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45 }
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46 }
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48 private static Object call(Closure closure,LuanStateImpl luan,Object[] args) throws LuanException {
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49 FnDef fnDef = closure.fnDef;
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50 Object[] varArgs = null;
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51 if( fnDef.isVarArg ) {
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52 if( args.length > fnDef.numArgs ) {
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53 varArgs = new Object[ args.length - fnDef.numArgs ];
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54 for( int i=0; i<varArgs.length; i++ ) {
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55 varArgs[i] = args[fnDef.numArgs+i];
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56 }
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57 } else {
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58 varArgs = LuanFunction.NOTHING;
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59 }
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60 }
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61 Object[] stack = luan.newFrame(closure,fnDef.stackSize,varArgs);
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62 final int n = Math.min(args.length,fnDef.numArgs);
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63 for( int i=0; i<n; i++ ) {
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64 stack[i] = args[i];
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65 }
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66 Object returnValues;
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67 try {
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68 fnDef.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 luan.popFrame();
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73 }
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74 return returnValues;
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75 }
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77 }