KickJava   Java API By Example, From Geeks To Geeks.

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


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 import gov.nasa.jpf.jvm.ElementInfo;
26 import gov.nasa.jpf.jvm.DynamicArea;
27
28 /**
29  * class abstracting instructions that access instance fields
30  */
31 public abstract class InstanceFieldInstruction extends FieldInstruction
32 {
33   int lastThis = -1;
34   
35   public FieldInfo getFieldInfo () {
36     if (fi == null) {
37       ClassInfo ci = ClassInfo.getClassInfo(className);
38       if (ci != null) {
39         fi = ci.getInstanceField(fname);
40       }
41     }
42     return fi;
43   }
44   
45   boolean isSchedulingRelevant (KernelState ks, ThreadInfo ti, int objRef) {
46     if (!ti.hasOtherRunnables() || !ks.da.isSchedulingRelevantObject(objRef)) {
47       return false;
48     }
49     
50     if (ti.usePorSyncDetection()) {
51       if (ti.getMethod().isCtor() || isLockProtected(ks.da.get(objRef), ti)) {
52         return false;
53       }
54     }
55     
56     return true;
57   }
58
59   
60   public int getLastThis() {
61     return lastThis;
62   }
63   
64   public ElementInfo getLastElementInfo () {
65     if (lastThis != -1) {
66       return DynamicArea.getHeap().get(lastThis);
67     }
68     
69     return null;
70   }
71 }
72
73
Popular Tags