Home | History | Annotate | Download | only in info 
      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.constant.*;
     25 import proguard.classfile.constant.visitor.ConstantVisitor;
     26 import proguard.classfile.util.SimplifiedVisitor;
     27 import proguard.classfile.visitor.*;
     28 
     29 /**
     30  * This ConstantVisitor marks all classes that refer to package visible classes
     31  * or class members.
     32  *
     33  * @author Eric Lafortune
     34  */
     35 public class PackageVisibleMemberInvokingClassMarker
     36 extends      SimplifiedVisitor
     37 implements   ConstantVisitor,
     38              ClassVisitor,
     39              MemberVisitor
     40 {
     41     private Clazz referencingClass;
     42 
     43 
     44     // Implementations for ConstantVisitor.
     45 
     46     public void visitAnyConstant(Clazz clazz, Constant constant) {}
     47 
     48 
     49     public void visitStringConstant(Clazz clazz, StringConstant stringConstant)
     50     {
     51         // Check the referenced class and class member, if any.
     52         if (stringConstant.referencedClass != clazz)
     53         {
     54             referencingClass = clazz;
     55 
     56             stringConstant.referencedClassAccept(this);
     57             stringConstant.referencedMemberAccept(this);
     58         }
     59     }
     60 
     61 
     62     public void visitAnyRefConstant(Clazz clazz, RefConstant refConstant)
     63     {
     64         // Check the referenced class and class member.
     65         if (refConstant.referencedClass != clazz)
     66         {
     67             referencingClass = clazz;
     68 
     69             refConstant.referencedClassAccept(this);
     70             refConstant.referencedMemberAccept(this);
     71         }
     72     }
     73 
     74 
     75     public void visitClassConstant(Clazz clazz, ClassConstant classConstant)
     76     {
     77         // Check the referenced class.
     78         if (classConstant.referencedClass != clazz)
     79         {
     80             referencingClass = clazz;
     81 
     82             classConstant.referencedClassAccept(this);
     83         }
     84     }
     85 
     86 
     87     // Implementations for ClassVisitor.
     88 
     89     public void visitAnyClass(Clazz clazz)
     90     {
     91         if ((clazz.getAccessFlags() &
     92              ClassConstants.ACC_PUBLIC) == 0)
     93         {
     94             setInvokesPackageVisibleMembers(referencingClass);
     95         }
     96     }
     97 
     98 
     99     // Implementations for MemberVisitor.
    100 
    101     public void visitAnyMember(Clazz clazz, Member member)
    102     {
    103         if ((member.getAccessFlags() &
    104              (ClassConstants.ACC_PUBLIC |
    105               ClassConstants.ACC_PRIVATE)) == 0)
    106         {
    107             setInvokesPackageVisibleMembers(referencingClass);
    108         }
    109     }
    110 
    111 
    112     // Small utility methods.
    113 
    114     private static void setInvokesPackageVisibleMembers(Clazz clazz)
    115     {
    116         ClassOptimizationInfo info = ClassOptimizationInfo.getClassOptimizationInfo(clazz);
    117         if (info != null)
    118         {
    119             info.setInvokesPackageVisibleMembers();
    120         }
    121     }
    122 
    123 
    124     public static boolean invokesPackageVisibleMembers(Clazz clazz)
    125     {
    126         ClassOptimizationInfo info = ClassOptimizationInfo.getClassOptimizationInfo(clazz);
    127         return info == null || info.invokesPackageVisibleMembers();
    128     }
    129 }