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Java > Open Source Codes > gov > nasa > jpf > search > heuristic > ChooseFree


1 //
2 // Copyright (C) 2005 United States Government as represented by the
3 // Administrator of the National Aeronautics and Space Administration
4 // (NASA). All Rights Reserved.
5 //
6 // This software is distributed under the NASA Open Source Agreement
7 // (NOSA), version 1.3. The NOSA has been approved by the Open Source
8 // Initiative. See the file NOSA-1.3-JPF at the top of the distribution
9 // directory tree for the complete NOSA document.
10 //
11 // THE SUBJECT SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY OF ANY
12 // KIND, EITHER EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT
13 // LIMITED TO, ANY WARRANTY THAT THE SUBJECT SOFTWARE WILL CONFORM TO
14 // SPECIFICATIONS, ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR
15 // A PARTICULAR PURPOSE, OR FREEDOM FROM INFRINGEMENT, ANY WARRANTY THAT
16 // THE SUBJECT SOFTWARE WILL BE ERROR FREE, OR ANY WARRANTY THAT
17 // DOCUMENTATION, IF PROVIDED, WILL CONFORM TO THE SUBJECT SOFTWARE.
18 //
19 package gov.nasa.jpf.search.heuristic;
20
21 import gov.nasa.jpf.VM;
22
23
24 /**
25  * Heuristic state prioritizer that favors executions that are not
26  * nondeterministic, i.e. deterministic. When analysing abstracted programs
27  * this has the effect of prioritizing "must"-transitions over "may"-transitions.
28  * An error detected using this heuristic has a good likelihood of being non-spurious.
29  */
30 public class ChooseFree implements Heuristic {
31   VM vm;
32
33   public ChooseFree (HeuristicSearch hSearch) {
34     vm = hSearch.getVM();
35   }
36
37   public int heuristicValue () {
38     int h_value = 1 + vm.getAbstractionNonDeterministicThreadCount();
39
40     return h_value;
41   }
42
43   public void processParent () {
44   }
45 }
46
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