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


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.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 /**
30  * Branch if int comparison with zero succeeds
31  * ..., value => ...
32  */
33 public class IFEQ extends IfInstruction {
34   private int target;
35
36   public void setPeer (org.apache.bcel.generic.Instruction i, ConstantPool cp) {
37     target = ((org.apache.bcel.generic.IFEQ) i).getTarget().getPosition();
38   }
39
40   public Instruction execute (SystemState ss, KernelState ks, ThreadInfo th) {
41     int v = th.pop();
42
43     if (v == 0) {
44       CoverageManager.incIFBranch(th.index, indexTrue);
45
46       return th.getMethod().getInstructionAt(target);
47     }
48
49     CoverageManager.incIFBranch(th.index, indexFalse);
50
51     return getNext(th);
52   }
53
54   public int getByteCode () {
55     return 0x99;
56   }
57 }
58
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