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Java > Open Source Codes > proguard > optimize > info > CatchExceptionMarker


1 /*
2  * ProGuard -- shrinking, optimization, obfuscation, and preverification
3  * of Java bytecode.
4  *
5  * Copyright (c) 2002-2007 Eric Lafortune (eric@graphics.cornell.edu)
6  *
7  * This library 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 library 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 Lesser General Public License
15  * for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public License
18  * along with this library; if not, write to the Free Software Foundation,
19  * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20  */
21 package proguard.optimize.info;
22
23 import proguard.classfile.util.SimplifiedVisitor;
24 import proguard.classfile.attribute.visitor.AttributeVisitor;
25 import proguard.classfile.attribute.*;
26 import proguard.classfile.*;
27
28 /**
29  * This AttributeVisitor marks all methods that catch exceptions.
30  *
31  * @author Eric Lafortune
32  */
33 public class CatchExceptionMarker
34 extends SimplifiedVisitor
35 implements 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
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