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annotate core/src/luan/impl/LuanStateImpl.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 e038905512d3
children b438a47196bc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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4eaee12f6c65 move luan/interp to impl
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1 package luan.impl;
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2
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3 import java.util.List;
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4 import java.util.ArrayList;
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5 import java.util.Map;
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6 import java.util.HashMap;
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7 import luan.Luan;
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8 import luan.LuanState;
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9 import luan.LuanTable;
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10 import luan.LuanFunction;
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11 import luan.LuanException;
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12 import luan.DeepCloner;
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13
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14
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15 public final class LuanStateImpl extends LuanState {
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17 private static class Frame {
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18 final Frame previousFrame;
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19 final Closure closure;
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20 final Object[] stack;
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21 final Object[] varArgs;
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22 UpValue[] downValues = null;
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24 Frame( Frame previousFrame, Closure closure, int stackSize, Object[] varArgs) {
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25 this.previousFrame = previousFrame;
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26 this.closure = closure;
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27 this.stack = new Object[stackSize];
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28 this.varArgs = varArgs;
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29 }
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31 void stackClear(int start,int end) {
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32 if( downValues != null ) {
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33 for( int i=start; i<end; i++ ) {
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34 UpValue downValue = downValues[i];
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35 if( downValue != null ) {
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36 downValue.close();
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37 downValues[i] = null;
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38 }
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39 }
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40 }
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41 for( int i=start; i<end; i++ ) {
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42 stack[i] = null;
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43 }
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44 }
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45
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46 UpValue getUpValue(int index) {
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47 if( downValues==null )
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48 downValues = new UpValue[stack.length];
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49 if( downValues[index] == null )
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50 downValues[index] = new UpValue(stack,index);
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51 return downValues[index];
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52 }
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53 }
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54
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55 private Frame frame = null;
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56 public Object returnValues;
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57
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58 LuanStateImpl() {}
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59
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60 private LuanStateImpl(LuanStateImpl luan) {
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61 super(luan);
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62 }
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63
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64 @Override public LuanState shallowClone() {
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65 // if( frame != null )
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66 // throw new IllegalStateException("frame isn't null");
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67 return new LuanStateImpl(this);
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68 }
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70 // returns stack
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71 Object[] newFrame(Closure closure, int stackSize, Object[] varArgs) {
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72 returnValues = LuanFunction.NOTHING;
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73 frame = new Frame(frame,closure,stackSize,varArgs);
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74 return frame.stack;
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75 }
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76
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77 void popFrame() {
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78 returnValues = LuanFunction.NOTHING;
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79 frame = frame.previousFrame;
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80 }
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82 Object stackGet(int index) {
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83 return frame.stack[index];
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84 }
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85
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86 public void stackSet(int index,Object value) {
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87 frame.stack[index] = value;
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88 }
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89
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90 public void stackClear(int start,int end) {
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91 frame.stackClear(start,end);
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92 }
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94 Object[] varArgs() {
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95 return frame.varArgs;
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96 }
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97
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98 Closure closure() {
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99 return frame.closure;
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100 }
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102 UpValue getUpValue(int index) {
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103 return frame.getUpValue(index);
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104 }
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105
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106 @Override public boolean hasJava() {
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107 if( frame==null )
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108 return false;
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109 return ((LuanTable)frame.closure.upValues()[0].get()).hasJava;
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110 }
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112 @Override public void setJava() {
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113 ((LuanTable)frame.closure.upValues()[0].get()).hasJava = true;
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114 }
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115
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116
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117 }