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      1 /*
      2  * ProGuard -- shrinking, optimization, obfuscation, and preverification
      3  *             of Java bytecode.
      4  *
      5  * Copyright (c) 2002-2014 Eric Lafortune (eric (at) 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 
     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