KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > proguard > preverify > Preverifier


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 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 preverify methods in program class pools, according to a given
30  * configuration.
31  *
32  * @author Eric Lafortune
33  */

34 public class Preverifier
35 {
36     private Configuration configuration;
37
38
39     /**
40      * Creates a new Preverifier.
41      */

42     public Preverifier(Configuration configuration)
43     {
44         this.configuration = configuration;
45     }
46
47
48     /**
49      * Performs preverification 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         // Preverify all methods.
57
ClassVisitor preverifier =
58             new AllMethodVisitor(
59             new AllAttributeVisitor(
60             new CodePreverifier(configuration.microEdition)));
61
62         // In Java Standard Edition, only class files from Java 6 or higher
63
// should be preverified.
64
if (!configuration.microEdition)
65         {
66             preverifier =
67                 new ClassVersionFilter(ClassConstants.INTERNAL_CLASS_VERSION_1_6,
68                                        Integer.MAX_VALUE,
69                                        preverifier);
70         }
71
72         programClassPool.classesAccept(preverifier);
73     }
74 }
75
Popular Tags