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


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
25 import org.apache.bcel.classfile.ConstantPool;
26
27
28 /**
29  * Get length of array
30  * ..., arrayref => ..., length
31  */

32 public class ARRAYLENGTH extends Instruction {
33   public void setPeer (org.apache.bcel.generic.Instruction i, ConstantPool cp) {
34   }
35
36   public Instruction execute (SystemState ss, KernelState ks, ThreadInfo th) {
37     int objref = th.pop();
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39     th.push(ks.da.get(objref).arrayLength(), false);
40
41     return getNext(th);
42   }
43
44   public int getByteCode () {
45     return 0xBE;
46   }
47 }
48
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