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.JPFException;
22: import gov.nasa.jpf.jvm.ElementInfo;
23: import gov.nasa.jpf.jvm.KernelState;
24: import gov.nasa.jpf.jvm.SystemState;
25: import gov.nasa.jpf.jvm.ThreadInfo;
26:
27: import gov.nasa.jpf.jvm.FieldInfo;
28:
29: /**
30: * Get static field from class
31: * ..., => ..., value
32: */
33: public class GETSTATIC extends StaticFieldInstruction {
34: public Instruction execute(SystemState ss, KernelState ks,
35: ThreadInfo ti) {
36: ElementInfo ei = ks.sa.get(className);
37: FieldInfo fi = getFieldInfo();
38:
39: switch (size) {
40: case 1:
41: int ival = ei.getIntField(fi);
42: ti.push(ival, fi.isReference());
43: break;
44: case 2:
45: long lval = ei.getLongField(fi);
46: ti.longPush(lval);
47: break;
48: default:
49: throw new JPFException("invalid field type");
50: }
51:
52: return getNext(ti);
53: }
54:
55: public int getByteCode() {
56: return 0xB2;
57: }
58:
59: public boolean isSchedulingRelevant(SystemState ss, KernelState ks,
60: ThreadInfo ti) {
61: // again very conservative - doesn't take into account if the object
62: // can be accessed from different threads, but that would be a static
63: // attribute (i.e. require statis analysis)
64:
65: if (ti.usePorFieldBoundaries()) {
66: return isSchedulingRelevant(ks, ti);
67: }
68: return false;
69: }
70: }
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