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


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.ArrayIndexOutOfBoundsExecutiveException;
22 import gov.nasa.jpf.jvm.ElementInfo;
23 import gov.nasa.jpf.jvm.KernelState;
24 import gov.nasa.jpf.jvm.SystemState;
25 import gov.nasa.jpf.jvm.ThreadInfo;
26
27
28 /**
29  * abstraction for all array store instructions
30  */
31 public abstract class ArrayStoreInstruction extends ArrayInstruction
32   implements StoreInstruction
33 {
34   public Instruction execute (SystemState ss, KernelState ks, ThreadInfo th) {
35     long value;
36     int index;
37     int arrayRef;
38
39     value = getValue(th);
40     index = th.pop();
41     arrayRef = th.pop();
42
43     ElementInfo e = ks.da.get(arrayRef);
44
45     if (arrayRef == -1) {
46       return th.createAndThrowException("java.lang.NullPointerException");
47     }
48
49     try {
50       setField(e, index, value);
51
52       return getNext(th);
53     } catch (ArrayIndexOutOfBoundsExecutiveException ex) {
54       return ex.getInstruction();
55     }
56   }
57
58   protected void setField (ElementInfo e, int index, long value)
59                     throws ArrayIndexOutOfBoundsExecutiveException {
60     e.checkArrayBounds(index);
61     e.setElement(index, (int) value);
62   }
63
64   protected long getValue (ThreadInfo th) {
65     return (long) th.pop();
66   }
67     
68   public boolean isSchedulingRelevant (SystemState ss, KernelState ks, ThreadInfo ti) {
69     // should be further discriminated based on if the array object
70 // is reachable for multiple threads
71 if (ti.usePorFieldBoundaries()) {
72       int off = getElementSize() + 1;
73       if (ks.da.isSchedulingRelevantObject(ti.peek(off)) && ti.hasOtherRunnables()) {
74         return true;
75       }
76     }
77     
78     return false;
79   }
80 }
81
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