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.ElementInfo;
22: import gov.nasa.jpf.jvm.KernelState;
23: import gov.nasa.jpf.jvm.SystemState;
24: import gov.nasa.jpf.jvm.ThreadInfo;
25:
26: import org.apache.bcel.classfile.ConstantPool;
27:
28: /**
29: * Check whether object is of given type
30: * ..., objectref => ..., objectref
31: */
32: public class CHECKCAST extends Instruction {
33: String type;
34:
35: public void setPeer(org.apache.bcel.generic.Instruction i,
36: ConstantPool cp) {
37: type = cp.constantToString(cp
38: .getConstant(((org.apache.bcel.generic.CHECKCAST) i)
39: .getIndex()));
40:
41: if (!type.startsWith("[")) {
42: type = "L" + type + ";";
43: }
44: }
45:
46: public Instruction execute(SystemState ss, KernelState ks,
47: ThreadInfo th) {
48: int objref = th.pop();
49:
50: if (objref == -1) {
51: th.push(objref, true);
52: } else {
53: ElementInfo e = ks.da.get(objref);
54:
55: if (e.instanceOf(type)) {
56: th.push(objref, true);
57: } else {
58: return th
59: .createAndThrowException("java.lang.ClassCastException");
60: }
61: }
62:
63: return getNext(th);
64: }
65:
66: public int getByteCode() {
67: return 0xC0;
68: }
69: }
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