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.KernelState;
22: import gov.nasa.jpf.jvm.SystemState;
23: import gov.nasa.jpf.jvm.ThreadInfo;
24: import gov.nasa.jpf.util.CoverageManager;
25:
26: import org.apache.bcel.classfile.ConstantPool;
27:
28: /**
29: * DOCUMENT ME!
30: */
31: public class IFNULL extends IfInstruction {
32: private int target;
33:
34: public void setPeer(org.apache.bcel.generic.Instruction i,
35: ConstantPool cp) {
36: target = ((org.apache.bcel.generic.IFNULL) i).getTarget()
37: .getPosition();
38: }
39:
40: public Instruction execute(SystemState ss, KernelState ks,
41: ThreadInfo th) {
42: int v = th.pop();
43:
44: if (v == -1) {
45: CoverageManager.incIFBranch(th.index, indexTrue);
46:
47: return th.getMethod().getInstructionAt(target);
48: }
49:
50: CoverageManager.incIFBranch(th.index, indexFalse);
51:
52: return getNext(th);
53: }
54:
55: public int getByteCode() {
56: return 0xC6;
57: }
58: }
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