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: import org.apache.bcel.generic.InstructionHandle;
27:
28: /**
29: * Access jump table by key match and jump
30: * ..., key => ...
31: */
32: public class LOOKUPSWITCH extends Instruction {
33: private int target;
34: private int[] matches;
35: private int[] targets;
36:
37: public void setPeer(org.apache.bcel.generic.Instruction i,
38: ConstantPool cp) {
39: target = ((org.apache.bcel.generic.LOOKUPSWITCH) i).getTarget()
40: .getPosition();
41: matches = ((org.apache.bcel.generic.LOOKUPSWITCH) i)
42: .getMatchs();
43:
44: int length = matches.length;
45: targets = new int[length];
46:
47: InstructionHandle[] ih = ((org.apache.bcel.generic.LOOKUPSWITCH) i)
48: .getTargets();
49:
50: for (int j = 0; j < length; j++) {
51: targets[j] = ih[j].getPosition();
52: }
53: }
54:
55: public Instruction execute(SystemState ss, KernelState ks,
56: ThreadInfo th) {
57: int value = th.pop();
58:
59: for (int i = 0, l = matches.length; i < l; i++) {
60: if (value == matches[i]) {
61: return th.getMethod().getInstructionAt(targets[i]);
62: }
63: }
64:
65: return th.getMethod().getInstructionAt(target);
66: }
67:
68: public int getByteCode() {
69: return 0xAB;
70: }
71: }
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