01: //
02: // Copyright (C) 2005 United States Government as represented by the
03: // Administrator of the National Aeronautics and Space Administration
04: // (NASA). All Rights Reserved.
05: //
06: // This software is distributed under the NASA Open Source Agreement
07: // (NOSA), version 1.3. The NOSA has been approved by the Open Source
08: // Initiative. See the file NOSA-1.3-JPF at the top of the distribution
09: // 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: * heuristic state prioritizer that maximizes global branch coverage
26: */
27: public class GlobalBranchCoverage implements Heuristic {
28:
29: // this assumes that calc_branch_coverage is set to true
30:
31: boolean count_early;
32: int branch_start;
33: int no_branch_return;
34:
35: public GlobalBranchCoverage(Config config) {
36: count_early = config
37: .getBoolean("search.heuristic.branch.count_early");
38: branch_start = config
39: .getInt("search.heuristic.branch.branch_start");
40: no_branch_return = config
41: .getInt("search.heuristic.branch.no_branch_return");
42: }
43:
44: public int heuristicValue() {
45: int li = CoverageManager.getLastIncrementedGlobal();
46:
47: if (li >= branch_start) {
48: return li + 1;
49: } else if (li >= 0) {
50: if (count_early) {
51: return li;
52: } else {
53: return 0;
54: }
55: } else if (no_branch_return >= 0) {
56: return no_branch_return;
57: } else {
58: return branch_start;
59: }
60: }
61:
62: public void processParent() {
63: }
64: }
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