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.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: int lastThis = -1;
33:
34: public FieldInfo getFieldInfo() {
35: if (fi == null) {
36: ClassInfo ci = ClassInfo.getClassInfo(className);
37: if (ci != null) {
38: fi = ci.getInstanceField(fname);
39: }
40: }
41: return fi;
42: }
43:
44: boolean isSchedulingRelevant(KernelState ks, ThreadInfo ti,
45: int objRef) {
46: if (!ti.hasOtherRunnables()
47: || !ks.da.isSchedulingRelevantObject(objRef)) {
48: return false;
49: }
50:
51: if (ti.usePorSyncDetection()) {
52: if (ti.getMethod().isCtor()
53: || isLockProtected(ks.da.get(objRef), ti)) {
54: return false;
55: }
56: }
57:
58: return true;
59: }
60:
61: public int getLastThis() {
62: return lastThis;
63: }
64:
65: public ElementInfo getLastElementInfo() {
66: if (lastThis != -1) {
67: return DynamicArea.getHeap().get(lastThis);
68: }
69:
70: return null;
71: }
72: }
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