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


1 //
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// Copyright (C) 2005 United States Government as represented by the
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// Administrator of the National Aeronautics and Space Administration
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// (NASA). All Rights Reserved.
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//
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// This software is distributed under the NASA Open Source Agreement
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// (NOSA), version 1.3. The NOSA has been approved by the Open Source
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// Initiative. See the file NOSA-1.3-JPF at the top of the distribution
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// directory tree for the complete NOSA document.
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//
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// THE SUBJECT SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY OF ANY
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// KIND, EITHER EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT
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// LIMITED TO, ANY WARRANTY THAT THE SUBJECT SOFTWARE WILL CONFORM TO
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// SPECIFICATIONS, ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR
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// A PARTICULAR PURPOSE, OR FREEDOM FROM INFRINGEMENT, ANY WARRANTY THAT
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// THE SUBJECT SOFTWARE WILL BE ERROR FREE, OR ANY WARRANTY THAT
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// DOCUMENTATION, IF PROVIDED, WILL CONFORM TO THE SUBJECT SOFTWARE.
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//
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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 succeeds
31  * ..., value1, value2 => ...
32  */

33 public class IF_ICMPNE 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.IF_ICMPNE) i).getTarget().getPosition();
38   }
39
40   public Instruction execute (SystemState ss, KernelState ks, ThreadInfo th) {
41     int v1 = th.pop();
42     int v2 = th.pop();
43
44     if (v1 != v2) {
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 0xA0;
57   }
58 }
59
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