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Java > Open Source Codes > gov > nasa > jpf > jvm > bytecode > StaticFieldInstruction


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.jvm.bytecode;
20
21 import gov.nasa.jpf.jvm.FieldInfo;
22 import gov.nasa.jpf.jvm.ClassInfo;
23 import gov.nasa.jpf.jvm.KernelState;
24 import gov.nasa.jpf.jvm.ThreadInfo;
25
26 /**
27  * class to abstract instructions accessing static fields
28  */
29 public abstract class StaticFieldInstruction extends FieldInstruction {
30   
31   public FieldInfo getFieldInfo () {
32     if (fi == null) {
33       ClassInfo ci = ClassInfo.getClassInfo(className);
34       if (ci != null) {
35         fi = ci.getStaticField(fname);
36       }
37     }
38     return fi;
39   }
40     
41   boolean isSchedulingRelevant (KernelState ks, ThreadInfo ti) {
42     if (!ti.hasOtherRunnables()) {
43       return false;
44     }
45     
46     if (ti.usePorSyncDetection()) {
47       if (isLockProtected(ks.sa.get(className), ti)) {
48         return false;
49       }
50     }
51     
52     return true;
53   }
54
55 }
56
57
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