Source Code Cross Referenced for ArrayLoadInstruction.java in  » Code-Analyzer » javapathfinder » gov » nasa » jpf » jvm » bytecode » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Code Analyzer » javapathfinder » gov.nasa.jpf.jvm.bytecode 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


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