Preverifier.java revision db267bc191f906f55eaef21a27110cce2ec57fdf
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 preverify methods in program class pools, according to a given 30 * configuration. 31 * 32 * @author Eric Lafortune 33 */ 34public class Preverifier 35{ 36 private final 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