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


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.Config;
22 import gov.nasa.jpf.util.CoverageManager;
23
24
25 /**
26  * heuristic state prioritizer that maximizes overall global branch coverage
27  */
28 public class PersistGlobalBranchCoverage implements Heuristic {
29   private int old = 1;
30   HeuristicSearch search;
31
32   public PersistGlobalBranchCoverage (Config config, HeuristicSearch search) {
33     this.search = search;
34     search.setCalcBranchCoverage(true);
35   }
36
37   public int heuristicValue () {
38     int li = CoverageManager.getLastIncrementedGlobal();
39
40     if (li >= 0) {
41       return li;
42     } else {
43       return old;
44     }
45   }
46
47   public void processParent () {
48     old = search.getOld().getPriority();
49   }
50 }
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