1 /* 2 * ProGuard -- shrinking, optimization, obfuscation, and preverification 3 * of Java bytecode. 4 * 5 * Copyright (c) 2002-2014 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 */ 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 34 extends SimplifiedVisitor 35 implements AttributeVisitor 36 { 37 // Implementations for AttributeVisitor. 38 visitAnyAttribute(Clazz clazz, Attribute attribute)39 public void visitAnyAttribute(Clazz clazz, Attribute attribute) {} 40 41 visitCodeAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute)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 markCatchException(Method method)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 catchesExceptions(Method method)63 public static boolean catchesExceptions(Method method) 64 { 65 MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method); 66 return info == null || 67 info.catchesExceptions(); 68 } 69 } 70