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view src/luan/interp/LuanStateImpl.java @ 77:4bf3d0c0b6b9
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> |
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date | Fri, 15 Feb 2013 09:55:17 +0000 |
parents | 8ede219cd111 |
children | 6db8f286fa6c |
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package luan.interp; import java.util.List; import java.util.ArrayList; import luan.Luan; import luan.LuanState; import luan.LuanTable; import luan.LuanFunction; import luan.MetatableGetter; import luan.LuanException; import luan.LuanElement; import luan.DeepCloner; final class LuanStateImpl extends LuanState { private static class Frame { final Frame previousFrame; final Closure closure; final Object[] stack; final Object[] varArgs; UpValue[] downValues = null; Frame( Frame previousFrame, Closure closure, int stackSize, Object[] varArgs) { this.previousFrame = previousFrame; this.closure = closure; this.stack = new Object[stackSize]; this.varArgs = varArgs; } void stackClear(int start,int end) { if( downValues != null ) { for( int i=start; i<end; i++ ) { UpValue downValue = downValues[i]; if( downValue != null ) { downValue.close(); downValues[i] = null; } } } for( int i=start; i<end; i++ ) { stack[i] = null; } } UpValue getUpValue(int index) { if( downValues==null ) downValues = new UpValue[stack.length]; if( downValues[index] == null ) downValues[index] = new UpValue(stack,index); return downValues[index]; } } private Frame frame = null; Object[] returnValues = LuanFunction.EMPTY_RTN; Closure tailFn; public LuanStateImpl() {} private LuanStateImpl(LuanStateImpl luan) { super(luan); } @Override public LuanState shallowClone() { if( frame != null ) throw new IllegalStateException("frame isn't null"); return new LuanStateImpl(this); } // returns stack Object[] newFrame(Closure closure, int stackSize, Object[] varArgs) { frame = new Frame(frame,closure,stackSize,varArgs); return frame.stack; } void popFrame() { returnValues = LuanFunction.EMPTY_RTN; tailFn = null; frame = frame.previousFrame; } Object stackGet(int index) { return frame.stack[index]; } void stackSet(int index,Object value) { frame.stack[index] = value; } void stackClear(int start,int end) { frame.stackClear(start,end); } Object[] varArgs() { return frame.varArgs; } Closure closure() { return frame.closure; } UpValue getUpValue(int index) { return frame.getUpValue(index); } final Object arithmetic(LuanElement el,String op,Object o1,Object o2) throws LuanException { LuanFunction fn = getBinHandler(el,op,o1,o2); if( fn != null ) return Luan.first(call(fn,el,op,o1,o2)); String type = Luan.toNumber(o1)==null ? Luan.type(o1) : Luan.type(o2); throw new LuanException(this,el,"attempt to perform arithmetic on a "+type+" value"); } }