1/*
2 * ProGuard -- shrinking, optimization, obfuscation, and preverification
3 *             of Java bytecode.
4 *
5 * Copyright (c) 2002-2009 Eric Lafortune (eric@graphics.cornell.edu)
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the Free
9 * Software Foundation; either version 2 of the License, or (at your option)
10 * any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21package proguard.optimize.info;
22
23import proguard.classfile.*;
24import proguard.classfile.attribute.*;
25import proguard.classfile.attribute.visitor.AttributeVisitor;
26import proguard.classfile.util.SimplifiedVisitor;
27
28/**
29 * This AttributeVisitor marks all methods that catch exceptions.
30 *
31 * @author Eric Lafortune
32 */
33public class CatchExceptionMarker
34extends      SimplifiedVisitor
35implements   AttributeVisitor
36{
37    // Implementations for AttributeVisitor.
38
39    public void visitAnyAttribute(Clazz clazz, Attribute attribute) {}
40
41
42    public void visitCodeAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute)
43    {
44        if (codeAttribute.u2exceptionTableLength > 0)
45        {
46            markCatchException(method);
47        }
48    }
49
50
51    // Small utility methods.
52
53    private static void markCatchException(Method method)
54    {
55        MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method);
56        if (info != null)
57        {
58            info.setCatchesExceptions();
59        }
60    }
61
62
63    public static boolean catchesExceptions(Method method)
64    {
65        MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method);
66        return info == null ||
67               info.catchesExceptions();
68    }
69}
70