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.jvm;
20:
21: import gov.nasa.jpf.jvm.bytecode.Instruction;
22: import gov.nasa.jpf.util.Debug;
23:
24: import java.util.Hashtable;
25:
26: /**
27: * helper class to tag certain execution states
28: */
29: public class Labels {
30: private static Hashtable labels = new Hashtable();
31:
32: public static boolean isAt(String label, ThreadInfo th) {
33: Instruction pc = (Instruction) labels.get(label);
34:
35: if (pc == null) {
36: return false;
37: }
38:
39: return th.getPC() == pc;
40: }
41:
42: public static void set(String label, Instruction pc) {
43: if (!JVM.observableLabels.contains(label)) {
44: Debug.println(Debug.MESSAGE, "Ignored label: " + label);
45:
46: return;
47: }
48:
49: if (labels.containsKey(label)) {
50: return;
51: }
52:
53: labels.put(label, pc);
54: pc.setObservable();
55: Debug.println(Debug.MESSAGE, "New label: " + label);
56: }
57: }
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