KickJava   Java API By Example, From Geeks To Geeks.

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


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.JPFException;
22 import gov.nasa.jpf.jvm.ClassInfo;
23 import gov.nasa.jpf.jvm.ElementInfo;
24 import gov.nasa.jpf.jvm.KernelState;
25 import gov.nasa.jpf.jvm.SystemState;
26 import gov.nasa.jpf.jvm.ThreadInfo;
27
28 import gov.nasa.jpf.jvm.FieldInfo;
29
30
31 /**
32  * Set static field in class
33  * ..., value => ...
34  */
35 public class PUTSTATIC extends StaticFieldInstruction implements StoreInstruction
36 {
37   public Instruction execute (SystemState ss, KernelState ks, ThreadInfo ti) {
38     ClassInfo ci = ClassInfo.getClassInfo(className);
39     ElementInfo ei = ks.sa.get(className);
40     FieldInfo fi = getFieldInfo();
41     
42     switch (fi.getStorageSize()) {
43       case 1:
44         int ival = ti.pop();
45         
46         if (fi.isReference()) {
47           ei.setReferenceField(fi, ival);
48         } else {
49           ei.setIntField(fi, ival);
50         }
51         break;
52       case 2:
53         long lval = ti.longPop();
54         ei.setLongField(fi, lval);
55         break;
56       default:
57         throw new JPFException("invalid field type");
58     }
59     
60     return getNext(ti);
61   }
62   
63   public int getByteCode () {
64     return 0xB3;
65   }
66   
67   public boolean isSchedulingRelevant (SystemState ss, KernelState ks, ThreadInfo ti) {
68     // again very conservative - doesn't take into account if the object
69 // can be accessed from different threads, but that would be a static
70 // attribute (i.e. require statis analysis)
71 if (ti.usePorFieldBoundaries()) {
72       return isSchedulingRelevant(ks, ti);
73     }
74     return false;
75   }
76 }
77
Popular Tags