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Java > Open Source Codes > proguard > classfile > editor > StackSizeUpdater


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.classfile.editor;
22
23 import proguard.classfile.*;
24 import proguard.classfile.attribute.*;
25 import proguard.classfile.attribute.visitor.*;
26 import proguard.classfile.util.SimplifiedVisitor;
27
28 /**
29  * This AttributeVisitor computes and updates the maximum stack size of the
30  * code attributes that it visits.
31  *
32  * @author Eric Lafortune
33  */
34 public class StackSizeUpdater
35 extends SimplifiedVisitor
36 implements AttributeVisitor
37 {
38     private StackSizeComputer stackSizeComputer = new StackSizeComputer();
39
40
41     // Implementations for AttributeVisitor.
42
43     public void visitAnyAttribute(Clazz clazz, Attribute attribute) {}
44
45
46     public void visitCodeAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute)
47     {
48         // Compute the stack sizes.
49 stackSizeComputer.visitCodeAttribute(clazz, method, codeAttribute);
50
51         // Update the maximum stack size.
52 codeAttribute.u2maxStack = stackSizeComputer.getMaxStackSize();
53     }
54 }
55
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