01: /*
02: * ProGuard -- shrinking, optimization, obfuscation, and preverification
03: * of Java bytecode.
04: *
05: * Copyright (c) 2002-2007 Eric Lafortune (eric@graphics.cornell.edu)
06: *
07: * This program is free software; you can redistribute it and/or modify it
08: * under the terms of the GNU General Public License as published by the Free
09: * 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 extends SimplifiedVisitor implements
35: AttributeVisitor {
36: private final StackSizeComputer stackSizeComputer = new StackSizeComputer();
37:
38: // Implementations for AttributeVisitor.
39:
40: public void visitAnyAttribute(Clazz clazz, Attribute attribute) {
41: }
42:
43: public void visitCodeAttribute(Clazz clazz, Method method,
44: CodeAttribute codeAttribute) {
45: // Compute the stack sizes.
46: stackSizeComputer.visitCodeAttribute(clazz, method,
47: codeAttribute);
48:
49: // Update the maximum stack size.
50: codeAttribute.u2maxStack = stackSizeComputer.getMaxStackSize();
51: }
52: }
|