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.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: * Determine if object is of given type
29: * ..., objectref => ..., result
30: */
31: public class INSTANCEOF extends Instruction {
32: private String type;
33:
34: public void setPeer(org.apache.bcel.generic.Instruction i,
35: ConstantPool cp) {
36: type = cp.constantToString(
37: cp.getConstant(((org.apache.bcel.generic.INSTANCEOF) i)
38: .getIndex())).replace('.', '/');
39:
40: if (!type.startsWith("[")) {
41: type = "L" + type + ";";
42: }
43: }
44:
45: public Instruction execute(SystemState ss, KernelState ks,
46: ThreadInfo th) {
47: int objref = th.pop();
48:
49: if (objref == -1) {
50: th.push(0, false);
51: } else if (ks.da.get(objref).instanceOf(type)) {
52: th.push(1, false);
53: } else {
54: th.push(0, false);
55: }
56:
57: return getNext(th);
58: }
59:
60: public int getByteCode() {
61: return 0xC1;
62: }
63: }
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