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annotate core/src/luan/impl/LuanStateImpl.java @ 200:9fb218211763

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add Package.block(); add LuanException.getFullMessage(); git-svn-id: https://luan-java.googlecode.com/svn/trunk@201 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Thu, 03 Jul 2014 22:22:16 +0000
parents 24ede40ee0aa
children 5ba136769034
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diff changeset
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.MetatableGetter;
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12 import luan.LuanException;
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13 import luan.LuanElement;
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14 import luan.DeepCloner;
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15
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17 final class LuanStateImpl extends LuanState {
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19 private static class Frame {
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20 final Frame previousFrame;
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21 final Closure closure;
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22 final Object[] stack;
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23 final Object[] varArgs;
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24 MtGetterLink mtGetterLink;
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25 UpValue[] downValues = null;
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27 Frame( Frame previousFrame, Closure closure, int stackSize, Object[] varArgs) {
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28 this.previousFrame = previousFrame;
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29 this.closure = closure;
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30 this.stack = new Object[stackSize];
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31 this.varArgs = varArgs;
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32 this.mtGetterLink = closure.mtGetterLink();
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33 }
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34
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35 void stackClear(int start,int end) {
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36 if( downValues != null ) {
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37 for( int i=start; i<end; i++ ) {
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38 UpValue downValue = downValues[i];
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39 if( downValue != null ) {
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40 downValue.close();
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41 downValues[i] = null;
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42 }
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43 }
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44 }
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45 for( int i=start; i<end; i++ ) {
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46 stack[i] = null;
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47 }
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48 }
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49
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50 UpValue getUpValue(int index) {
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51 if( downValues==null )
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52 downValues = new UpValue[stack.length];
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53 if( downValues[index] == null )
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54 downValues[index] = new UpValue(stack,index);
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55 return downValues[index];
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56 }
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58 void addMetatableGetter(MetatableGetter mg) {
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59 if( mtGetterLink==null || !mtGetterLink.contains(mg) )
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60 mtGetterLink = new MtGetterLink(mg,mtGetterLink);
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61 }
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62 }
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63
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64 private Frame frame = null;
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65 Object returnValues;
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66 Closure tailFn;
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67 MtGetterLink mtGetterLink = null;
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68
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69 LuanStateImpl() {}
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70
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71 private LuanStateImpl(LuanStateImpl luan) {
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72 super(luan);
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73 }
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74
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75 @Override public LuanState shallowClone() {
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76 // if( frame != null )
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77 // throw new IllegalStateException("frame isn't null");
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78 return new LuanStateImpl(this);
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79 }
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81 // returns stack
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82 Object[] newFrame(Closure closure, int stackSize, Object[] varArgs) {
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83 returnValues = LuanFunction.NOTHING;
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84 tailFn = null;
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85 frame = new Frame(frame,closure,stackSize,varArgs);
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86 return frame.stack;
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87 }
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88
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89 void popFrame() {
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90 returnValues = LuanFunction.NOTHING;
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91 tailFn = null;
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92 mtGetterLink = frame.mtGetterLink;
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93 frame = frame.previousFrame;
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94 }
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95
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96 Object stackGet(int index) {
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97 return frame.stack[index];
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98 }
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99
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100 void stackSet(int index,Object value) {
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101 frame.stack[index] = value;
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102 }
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103
32
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104 void stackClear(int start,int end) {
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105 frame.stackClear(start,end);
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106 }
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107
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108 Object[] varArgs() {
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109 return frame.varArgs;
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110 }
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111
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112 Closure closure() {
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113 return frame.closure;
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114 }
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115
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116 UpValue getUpValue(int index) {
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117 return frame.getUpValue(index);
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118 }
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119
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120 @Override public LuanTable currentEnvironment() {
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121 if( frame==null )
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122 return null;
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123 return (LuanTable)frame.closure.upValues()[0].get();
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124 }
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125
195
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126 MtGetterLink mtGetterLink() {
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127 return frame==null ? null : frame.mtGetterLink;
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128 }
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129
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130 @Override public LuanTable getMetatable(Object obj,MetatableGetter beforeThis) {
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131 if( obj instanceof LuanTable ) {
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132 LuanTable table = (LuanTable)obj;
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133 return table.getMetatable();
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134 }
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135 MtGetterLink mtGetterLink = mtGetterLink();
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136 return mtGetterLink==null ? null : mtGetterLink.getMetatable(obj,beforeThis);
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137 }
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138
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139 @Override public void addMetatableGetter(MetatableGetter mg) {
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140 frame.addMetatableGetter(mg);
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141 }
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142
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143 }