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annotate src/main/gov/nasa/jpf/search/RandomSearch.java @ 0:61d41facf527

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initial v8 import (history reset)
author Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
date Fri, 23 Jan 2015 10:14:01 -0800
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
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1 /*
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2 * Copyright (C) 2014, United States Government, as represented by the
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
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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 package gov.nasa.jpf.search;
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19
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20
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21 import gov.nasa.jpf.Config;
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22 import gov.nasa.jpf.vm.VM;
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23 import gov.nasa.jpf.vm.RestorableVMState;
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24
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25
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26 /**
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27 * this is a straight execution pseudo-search - it doesn't search at
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28 * all (i.e. it doesn't backtrack), but just behaves like a 'normal' VM,
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29 * going forward() until there is no next state then it restarts the search
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30 * until it hits a certain number of paths executed
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31 *
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32 * <2do> this needs to be updated & tested
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33 */
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34 public class RandomSearch extends Search {
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35 int path_limit = 0;
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36
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37 public RandomSearch (Config config, VM vm) {
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38 super(config, vm);
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39
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40 path_limit = config.getInt("search.RandomSearch.path_limit", 0);
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41 }
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42
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43 @Override
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44 public void search () {
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45 int depth = 0;
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46 int paths = 0;
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47 depth++;
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48
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49 if (hasPropertyTermination()) {
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50 return;
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51 }
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52
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53 //vm.forward();
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54 RestorableVMState init_state = vm.getRestorableState();
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55
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56 notifySearchStarted();
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57 while (!done) {
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58 if ((depth < depthLimit) && forward()) {
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59 notifyStateAdvanced();
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60
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61 if (currentError != null){
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62 notifyPropertyViolated();
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63
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64 if (hasPropertyTermination()) {
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65 return;
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66 }
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67 }
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68
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69 if (isEndState()){
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70 return;
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71 }
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72
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73 depth++;
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74
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75 } else { // no next state or reached depth limit
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76 // <2do> we could check for more things here. If the last insn wasn't
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77 // the main return, or a System.exit() call, we could flag a JPFException
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78 if (depth >= depthLimit) {
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79 notifySearchConstraintHit("depth limit reached: " + depthLimit);
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80 }
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81 checkPropertyViolation();
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82 done = (paths >= path_limit);
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83 paths++;
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84 System.out.println("paths = " + paths);
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85 depth = 1;
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86 vm.restoreState(init_state);
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87 vm.resetNextCG();
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88 }
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89 }
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90 notifySearchFinished();
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91 }
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92 }