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Java > Open Source Codes > proguard > preverify > SubroutineInliner


1 /*
2  * ProGuard -- shrinking, optimization, obfuscation, and preverification
3  * of Java bytecode.
4  *
5  * Copyright (c) 2002-2007 Eric Lafortune (eric@graphics.cornell.edu)
6  *
7  * This library 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 library 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 Lesser General Public License
15  * for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public License
18  * along with this library; if not, write to the Free Software Foundation,
19  * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20  */
21 package proguard.preverify;
22
23 import proguard.classfile.*;
24 import proguard.classfile.attribute.visitor.AllAttributeVisitor;
25 import proguard.classfile.visitor.*;
26 import proguard.Configuration;
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 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
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