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: * Branch if reference comparison succeeds
30: * ..., value1, value2 => ...
31: */
32: public class IF_ACMPEQ extends IfInstruction {
33: private int target;
34:
35: public void setPeer(org.apache.bcel.generic.Instruction i,
36: ConstantPool cp) {
37: target = ((org.apache.bcel.generic.IF_ACMPEQ) i).getTarget()
38: .getPosition();
39: }
40:
41: public Instruction execute(SystemState ss, KernelState ks,
42: ThreadInfo th) {
43: int v1 = th.pop();
44: int v2 = th.pop();
45:
46: if (v1 == v2) {
47: CoverageManager.incIFBranch(th.index, indexTrue);
48:
49: return th.getMethod().getInstructionAt(target);
50: }
51:
52: CoverageManager.incIFBranch(th.index, indexFalse);
53:
54: return getNext(th);
55: }
56:
57: public int getByteCode() {
58: return 0xA5;
59: }
60: }
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