01: /*
02: * ProGuard -- shrinking, optimization, obfuscation, and preverification
03: * of Java bytecode.
04: *
05: * Copyright (c) 2002-2007 Eric Lafortune (eric@graphics.cornell.edu)
06: *
07: * This library is free software; you can redistribute it and/or modify it
08: * under the terms of the GNU General Public License as published by the Free
09: * 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.*;
24: import proguard.classfile.attribute.*;
25: import proguard.classfile.attribute.visitor.AttributeVisitor;
26: import proguard.classfile.util.SimplifiedVisitor;
27:
28: /**
29: * This AttributeVisitor marks all methods that catch exceptions.
30: *
31: * @author Eric Lafortune
32: */
33: public class CatchExceptionMarker extends SimplifiedVisitor implements
34: AttributeVisitor {
35: // Implementations for AttributeVisitor.
36:
37: public void visitAnyAttribute(Clazz clazz, Attribute attribute) {
38: }
39:
40: public void visitCodeAttribute(Clazz clazz, Method method,
41: CodeAttribute codeAttribute) {
42: if (codeAttribute.u2exceptionTableLength > 0) {
43: markCatchException(method);
44: }
45: }
46:
47: // Small utility methods.
48:
49: private static void markCatchException(Method method) {
50: MethodOptimizationInfo info = MethodOptimizationInfo
51: .getMethodOptimizationInfo(method);
52: if (info != null) {
53: info.setCatchesExceptions();
54: }
55: }
56:
57: public static boolean catchesExceptions(Method method) {
58: MethodOptimizationInfo info = MethodOptimizationInfo
59: .getMethodOptimizationInfo(method);
60: return info == null || info.catchesExceptions();
61: }
62: }
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