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      1 /*
      2  * ProGuard -- shrinking, optimization, obfuscation, and preverification
      3  *             of Java bytecode.
      4  *
      5  * Copyright (c) 2002-2009 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.constant.visitor.ConstantVisitor;
     25 import proguard.classfile.constant.*;
     26 import proguard.classfile.util.SimplifiedVisitor;
     27 
     28 /**
     29  * This ConstantVisitor marks all classes that invoke package visible members
     30  * in other classes.
     31  *
     32  * @author Eric Lafortune
     33  */
     34 public class PackageVisibleMemberInvokingClassMarker
     35 extends      SimplifiedVisitor
     36 implements   ConstantVisitor
     37 {
     38     // Implementations for ConstantVisitor.
     39 
     40     public void visitAnyConstant(Clazz clazz, Constant constant) {}
     41 
     42 
     43     public void visitAnyRefConstant(Clazz clazz, RefConstant refConstant)
     44     {
     45         Clazz referencedClass = refConstant.referencedClass;
     46         if (referencedClass != null &&
     47             (referencedClass.getAccessFlags() &
     48              ClassConstants.INTERNAL_ACC_PUBLIC) == 0)
     49         {
     50             setInvokesPackageVisibleMembers(clazz);
     51         }
     52 
     53         Member referencedMember = refConstant.referencedMember;
     54         if (referencedMember != null &&
     55             (referencedMember.getAccessFlags() &
     56              (ClassConstants.INTERNAL_ACC_PUBLIC |
     57               ClassConstants.INTERNAL_ACC_PRIVATE)) == 0)
     58         {
     59             setInvokesPackageVisibleMembers(clazz);
     60         }
     61     }
     62 
     63 
     64     // Small utility methods.
     65 
     66     private static void setInvokesPackageVisibleMembers(Clazz clazz)
     67     {
     68         ClassOptimizationInfo info = ClassOptimizationInfo.getClassOptimizationInfo(clazz);
     69         if (info != null)
     70         {
     71             info.setInvokesPackageVisibleMembers();
     72         }
     73     }
     74 
     75 
     76     public static boolean invokesPackageVisibleMembers(Clazz clazz)
     77     {
     78         ClassOptimizationInfo info = ClassOptimizationInfo.getClassOptimizationInfo(clazz);
     79         return info == null || info.invokesPackageVisibleMembers();
     80     }
     81 }