SubroutineInliner.java revision 9f606f95f03a75961498803e24bee6799a7c0885 
1/*
2 * ProGuard -- shrinking, optimization, obfuscation, and preverification
3 *             of Java bytecode.
4 *
5 * Copyright (c) 2002-2009 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 */
21package proguard.preverify;
22
23import proguard.Configuration;
24import proguard.classfile.*;
25import proguard.classfile.attribute.visitor.AllAttributeVisitor;
26import 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 */
34public 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