01: /*
02: * FindBugs - Find bugs in Java programs
03: * Copyright (C) 2004,2005 Dave Brosius <dbrosius@users.sourceforge.net>
04: * Copyright (C) 2004,2005 University of Maryland
05: *
06: * This library is free software; you can redistribute it and/or
07: * modify it under the terms of the GNU Lesser General Public
08: * License as published by the Free Software Foundation; either
09: * version 2.1 of the License, or (at your option) any later version.
10: *
11: * This library is distributed in the hope that it will be useful,
12: * but WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: * Lesser General Public License for more details.
15: *
16: * You should have received a copy of the GNU Lesser General Public
17: * License along with this library; if not, write to the Free Software
18: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19: */
20:
21: package edu.umd.cs.findbugs.visitclass;
22:
23: import org.apache.bcel.classfile.LocalVariable;
24: import org.apache.bcel.classfile.LocalVariableTable;
25:
26: import edu.umd.cs.findbugs.annotations.NonNull;
27:
28: /**
29: * Eases access to a BCEL LocalVariable object
30: */
31: public class LVTHelper {
32: /**
33: * returns the local variable at an index int the scope of PC
34: *
35: * @param lvt the local variable table
36: * @param index the variable index
37: * @param pc the PC where the variable is used
38: */
39: public static LocalVariable getLocalVariableAtPC(@NonNull
40: LocalVariableTable lvt, int index, int pc) {
41: int length = lvt.getTableLength();
42: LocalVariable[] lvs = lvt.getLocalVariableTable();
43:
44: for (int i = 0; i < length; i++) {
45: if (lvs[i].getIndex() == index) {
46: int startPC = lvs[i].getStartPC();
47: if ((pc >= startPC)
48: && (pc < (startPC + lvs[i].getLength())))
49: return lvs[i];
50: }
51: }
52:
53: return null;
54: }
55: }
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