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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.preverify;
     22 
     23 import proguard.Configuration;
     24 import proguard.classfile.*;
     25 import proguard.classfile.attribute.visitor.AllAttributeVisitor;
     26 import proguard.classfile.visitor.*;
     27 
     28 /**
     29  * This class can inline subroutines in methods. This is generally useful (i.e.
     30  * required) for preverifying code.
     31  *
     32  * @author Eric Lafortune
     33  */
     34 public class SubroutineInliner
     35 {
     36     private final Configuration configuration;
     37 
     38 
     39     /**
     40      * Creates a new SubroutineInliner.
     41      */
     42     public SubroutineInliner(Configuration configuration)
     43     {
     44         this.configuration = configuration;
     45     }
     46 
     47 
     48     /**
     49      * Performs subroutine inlining of the given program class pool.
     50      */
     51     public void execute(ClassPool programClassPool)
     52     {
     53         // Clean up any old visitor info.
     54         programClassPool.classesAccept(new ClassCleaner());
     55 
     56         // Inline all subroutines.
     57         ClassVisitor inliner =
     58             new AllMethodVisitor(
     59             new AllAttributeVisitor(
     60             new CodeSubroutineInliner()));
     61 
     62         // In Java Standard Edition, only class files from Java 6 or higher
     63         // should be preverified.
     64         if (!configuration.microEdition)
     65         {
     66             inliner =
     67                 new ClassVersionFilter(ClassConstants.INTERNAL_CLASS_VERSION_1_6,
     68                                        Integer.MAX_VALUE,
     69                                        inliner);
     70         }
     71 
     72         programClassPool.classesAccept(inliner);
     73     }
     74 }
     75