Mercurial > hg > Members > kono > jpf-core

annotate src/main/gov/nasa/jpf/util/script/EventGeneratorFactory.java @ 0:61d41facf527

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author Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
date Fri, 23 Jan 2015 10:14:01 -0800
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1 /*
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2 * Copyright (C) 2014, United States Government, as represented by the
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3 * Administrator of the National Aeronautics and Space Administration.
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4 * All rights reserved.
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5 *
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6 * The Java Pathfinder core (jpf-core) platform is licensed under the
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7 * Apache License, Version 2.0 (the "License"); you may not use this file except
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8 * in compliance with the License. You may obtain a copy of the License at
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9 *
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10 * http://www.apache.org/licenses/LICENSE-2.0.
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11 *
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12 * Unless required by applicable law or agreed to in writing, software
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13 * distributed under the License is distributed on an "AS IS" BASIS,
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14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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15 * See the License for the specific language governing permissions and
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16 * limitations under the License.
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17 */
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18
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19 package gov.nasa.jpf.util.script;
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20
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21 import gov.nasa.jpf.Config;
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22 import gov.nasa.jpf.ListenerAdapter;
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23 import gov.nasa.jpf.search.Search;
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24 import gov.nasa.jpf.util.DynamicObjectArray;
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25 import gov.nasa.jpf.vm.ChoiceGenerator;
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26 import gov.nasa.jpf.vm.SystemState;
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27
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28 import java.io.PrintWriter;
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29 import java.util.ArrayList;
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30 import java.util.Iterator;
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31 import java.util.LinkedHashMap;
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32
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33 /**
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34 * abstract root for backtrackable event generator factories
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35 *
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36 * <2do> - we don't support backtracking for sections yet! needs to be implemented for
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37 * state charts
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38 */
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39 public abstract class EventGeneratorFactory extends ListenerAdapter
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40 implements ElementProcessor, Iterable<EventGenerator> {
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41
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42 static final String DEFAULT = "default";
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43
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44 // helper class to store our internal state. For a simple script based system,
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45 // storing the 'cur' index (into the queue) would do, but the queue might have been
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46 // generated dynamically, so we need some container to store both
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47 static class Memento {
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48 ArrayList<EventGenerator> queue;
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49 int cur; // cursor into queue
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50
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51 Memento (EventGeneratorFactory fact) {
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52 queue = fact.queue;
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53 cur = fact.cur;
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54 }
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55
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56 void restore (EventGeneratorFactory fact) {
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57 fact.queue = queue;
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58 fact.cur = cur;
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59 }
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60 }
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61
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62
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63 // <2do> this is lame - if we really want 'instructions' in the queue, rather
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64 // than data (== CGs), then we should have a queue of general EventOp entries
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65 // this is only used for unbounded REPEATs so far
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66 // <2do> the nextCG is currently unconditionally reset in getNextChoiceGenerator()
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67 // so we have to make sure we don't jump back if the jump target state was already
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68 // visited, which we have to store in the Jump
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69 static class Loop extends EventGenerator {
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70
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71 int startPos, endPos;
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72
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73 Loop (String id, int startPos, int endPos){
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74 super(id);
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75
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76 this.startPos = startPos;
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77 this.endPos = endPos;
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78 }
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79
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80 int getStartPos() {
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81 return startPos;
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82 }
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83
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84 //--- those are all dummies - this isn't really a choice
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85 @Override
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86 public void advance() {}
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87
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88 @Override
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89 public Class getChoiceType() {
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90 return null;
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91 }
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92
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93 @Override
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94 public Object getNextChoice() {
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95 return null;
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96 }
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97
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98 @Override
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99 public int getProcessedNumberOfChoices() {
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100 return 0;
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101 }
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102
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103 @Override
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104 public int getTotalNumberOfChoices() {
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105 return 0;
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106 }
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107
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108 @Override
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109 public boolean hasMoreChoices() {
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110 return false;
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111 }
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112
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113 @Override
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114 public ChoiceGenerator randomize() {
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115 return null;
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116 }
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117
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118 @Override
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119 public void reset() {}
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120
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121 }
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122
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123 /** the last returned position in the generator stream */
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124 protected int cur;
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125
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126 /** this is where we store the cur positions for backtracking and restoring states */
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127 DynamicObjectArray<Memento> states;
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128
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129 protected String scriptFileName;
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130 protected Script script;
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131 protected Config conf;
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132
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133 protected LinkedHashMap<String,ArrayList<EventGenerator>> sections;
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134 protected ArrayList<EventGenerator> queue;
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135
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136 EventFactory efact;
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137
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138 protected EventGeneratorFactory () {
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139 efact = null;
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140 }
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141
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142 protected EventGeneratorFactory (EventFactory efact) {
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143 this.efact = efact;
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144 }
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145
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146 protected void init (String fname) throws ESParser.Exception {
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147 cur = 0;
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148 states = new DynamicObjectArray<Memento>();
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149
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150 sections = new LinkedHashMap<String,ArrayList<EventGenerator>>();
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151 queue = new ArrayList<EventGenerator>();
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152 sections.put(DEFAULT, queue);
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153
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154 ESParser parser= new ESParser(fname, efact);
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
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155 script = parser.parse();
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156 scriptFileName = fname;
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diff changeset
157
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158 script.process(this);
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159 }
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diff changeset
160
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diff changeset
161 @Override
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162 public Iterator<EventGenerator> iterator() {
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163 return queue.iterator();
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164 }
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diff changeset
165
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166 protected void addLoop (int startPos) {
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167 queue.add( new Loop( "loop", startPos, queue.size()-1));
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168 }
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169
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diff changeset
170 public abstract Class<?> getEventType();
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171
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172 /**
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173 * reset the enumeration state of this factory
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174 */
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175 public void reset () {
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176 cur = 0;
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177 }
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178
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179 public String getScriptFileName() {
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180 return scriptFileName;
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181 }
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182
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183 public Script getScript() {
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184 return script;
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185 }
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186
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187 public boolean hasSection (String id) {
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188 return sections.containsKey(id);
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189 }
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190
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191 public ArrayList<EventGenerator> getSection (String id) {
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192 return sections.get(id);
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193 }
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194
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195 public ArrayList<EventGenerator> getDefaultSection () {
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196 return sections.get(DEFAULT);
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197 }
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198
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199 protected void setQueue (ArrayList<EventGenerator> q) {
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200 if (queue != q) {
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201 queue = q;
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202 cur = 0;
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203 }
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204 }
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205
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206 protected EventGenerator getNextEventGenerator() {
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207 EventGenerator cg;
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208 int n = queue.size();
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209
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210 if (n == 0) {
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211 return null; // nothing to do
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212 }
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213
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diff changeset
214 if (cur < n) {
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215 cg = getQueueItem(cur); // might clone the queue item
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216
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217 // <2do> - this is a BAD hot fix, but it's going away soon!
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218 if (cg instanceof Loop) {
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219 int tgtPos = ((Loop)cg).getStartPos();
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220 cg = queue.get(tgtPos);
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221
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222 if (!cg.hasMoreChoices()) {
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223 for (int i=tgtPos; i<cur; i++) {
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224 queue.get(i).reset();
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225 }
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226 }
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227
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228 cur = tgtPos;
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229 }
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diff changeset
230
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231 cg.setId(Integer.toString(cur));
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232
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233 // might be reused if we re-enter a section sequence or REPEAT body, so we have to reset
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234 // <2do> - commenting this out leads to premature state matching on model loops
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235 // (will be fixed by the revamped environment modeling)
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236 //cg.reset();
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237
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diff changeset
238 cur++;
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diff changeset
239 return cg;
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240
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241 } else {
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242 return null; // nothing left
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243 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
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diff changeset
244 }
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245
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diff changeset
246 // we encapsulate this because it might require cloning
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diff changeset
247 protected EventGenerator getQueueItem (int i) {
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248 return queue.get(i);
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249 }
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250
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diff changeset
251
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diff changeset
252 public int getTotalNumberOfEvents() {
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diff changeset
253 int total=0;
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diff changeset
254 int last = 1;
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diff changeset
255
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diff changeset
256 for (EventGenerator cg : queue) {
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diff changeset
257 int level = cg.getTotalNumberOfChoices() * last;
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diff changeset
258 total += level;
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diff changeset
259 last = level;
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diff changeset
260 }
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diff changeset
261
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diff changeset
262 return total;
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parents:
diff changeset
263 }
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diff changeset
264
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
265 public void printOn (PrintWriter pw) {
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
266 for (EventGenerator eg : queue) {
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parents:
diff changeset
267 pw.println(eg);
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parents:
diff changeset
268 }
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parents:
diff changeset
269 }
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diff changeset
270
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diff changeset
271 /************************************** SearchListener interface **************/
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parents:
diff changeset
272 /* we need this after a backtrack and restore to determine the next CG to return
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parents:
diff changeset
273 */
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parents:
diff changeset
274
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parents:
diff changeset
275 @Override
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parents:
diff changeset
276 public void searchStarted (Search search) {
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parents:
diff changeset
277 cur = 0;
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parents:
diff changeset
278 }
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parents:
diff changeset
279
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parents:
diff changeset
280 @Override
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
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diff changeset
281 public void stateAdvanced (Search search) {
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parents:
diff changeset
282 int idx = search.getStateId();
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parents:
diff changeset
283
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parents:
diff changeset
284 if (idx >= 0) { // <??> why would it be notified for the init state?
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diff changeset
285 Memento m = new Memento(this);
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
286 states.set(idx, m);
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
287 }
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parents:
diff changeset
288 }
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parents:
diff changeset
289
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
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diff changeset
290 @Override
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
291 public void stateBacktracked (Search search) {
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
292 Memento m = states.get(search.getStateId());
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
293 m.restore(this);
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
294 // nextCg will be re-computed (->getNext), so there is no need to reset
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parents:
diff changeset
295 }
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parents:
diff changeset
296
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
297 @Override
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
298 public void stateRestored (Search search) {
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parents:
diff changeset
299 Memento m = states.get(search.getStateId());
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
300 m.restore(this);
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parents:
diff changeset
301
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
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302 // nextCg is restored (not re-computed), so we need to reset
61d41facf527 initial v8 import (history reset)
Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
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303 SystemState ss = search.getVM().getSystemState();
61d41facf527 initial v8 import (history reset)
Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
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304 ChoiceGenerator cgNext = ss.getNextChoiceGenerator();
61d41facf527 initial v8 import (history reset)
Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
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305 cgNext.reset();
61d41facf527 initial v8 import (history reset)
Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
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306 }
61d41facf527 initial v8 import (history reset)
Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
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307
61d41facf527 initial v8 import (history reset)
Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
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308 }