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annotate src/luan/interp/LuaStateImpl.java @ 32:c3eab5a3ce3c

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implement closures git-svn-id: https://luan-java.googlecode.com/svn/trunk@33 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Fri, 14 Dec 2012 05:40:35 +0000
parents 5cf15507d77e
children 0cdc1da466ee
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31
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1 package luan.interp;
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3 import luan.LuaState;
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4 import luan.LuaTable;
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5 import luan.LuaFunction;
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8 final class LuaStateImpl implements LuaState {
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9 private final LuaTable env = new LuaTable();
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11 @Override public LuaTable env() {
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12 return env;
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13 }
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16 private static class Frame {
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17 final Frame previousFrame;
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18 final LuaClosure closure;
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19 final Object[] stack;
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20 final Object[] varArgs;
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21 UpValue[] downValues = null;
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23 Frame( Frame previousFrame, LuaClosure closure, int stackSize, Object[] varArgs) {
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24 this.previousFrame = previousFrame;
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25 this.closure = closure;
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26 this.stack = new Object[stackSize];
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27 this.varArgs = varArgs;
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28 }
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30 void stackClear(int start,int end) {
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31 if( downValues != null ) {
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32 for( int i=start; i<end; i++ ) {
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33 UpValue downValue = downValues[i];
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34 if( downValue != null ) {
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35 downValue.close();
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36 downValues[i] = null;
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37 }
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38 }
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39 }
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40 for( int i=start; i<end; i++ ) {
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41 stack[i] = null;
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42 }
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43 }
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45 UpValue getUpValue(int index) {
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46 if( downValues==null )
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47 downValues = new UpValue[stack.length];
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48 if( downValues[index] == null )
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49 downValues[index] = new UpValue(stack,index);
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50 return downValues[index];
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51 }
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52 }
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54 private Frame frame = null;
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55 Object[] returnValues;
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56 LuaClosure tailFn;
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58 // returns stack
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59 Object[] newFrame(LuaClosure closure, int stackSize, Object[] varArgs) {
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60 frame = new Frame(frame,closure,stackSize,varArgs);
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61 return frame.stack;
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62 }
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64 void popFrame() {
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65 returnValues = LuaFunction.EMPTY_RTN;
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66 tailFn = null;
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67 frame = frame.previousFrame;
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68 }
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70 Object stackGet(int index) {
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71 return frame.stack[index];
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72 }
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74 void stackSet(int index,Object value) {
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75 frame.stack[index] = value;
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76 }
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78 void stackClear(int start,int end) {
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79 frame.stackClear(start,end);
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80 }
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82 Object[] varArgs() {
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83 return frame.varArgs;
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84 }
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86 LuaClosure closure() {
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87 return frame.closure;
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88 }
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90 UpValue getUpValue(int index) {
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91 return frame.getUpValue(index);
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92 }
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93 }