1 /* 2 * ProGuard -- shrinking, optimization, obfuscation, and preverification 3 * of Java bytecode. 4 * 5 * Copyright (c) 2002-2014 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 final StackSizeComputer stackSizeComputer = new StackSizeComputer(); 39 40 41 // Implementations for AttributeVisitor. 42 visitAnyAttribute(Clazz clazz, Attribute attribute)43 public void visitAnyAttribute(Clazz clazz, Attribute attribute) {} 44 45 visitCodeAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute)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