1b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato/* 2b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * ProGuard -- shrinking, optimization, obfuscation, and preverification 3b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * of Java bytecode. 4b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 5b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Copyright (c) 2002-2009 Eric Lafortune (eric@graphics.cornell.edu) 6b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 7b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * This program is free software; you can redistribute it and/or modify it 8b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * under the terms of the GNU General Public License as published by the Free 9b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Software Foundation; either version 2 of the License, or (at your option) 10b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * any later version. 11b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 12b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * This program is distributed in the hope that it will be useful, but WITHOUT 13b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 15b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * more details. 16b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 17b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * You should have received a copy of the GNU General Public License along 18b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * with this program; if not, write to the Free Software Foundation, Inc., 19b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 21b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratopackage proguard.optimize.peephole; 22b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 23b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimport proguard.classfile.*; 24b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimport proguard.classfile.util.*; 25b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimport proguard.classfile.visitor.*; 26b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimport proguard.optimize.KeepMarker; 27b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 28b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato/** 29b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * This <code>ClassVisitor</code> makes the program classes that it visits 30b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * final, if possible. 31b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 32b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * @author Eric Lafortune 33b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 34b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratopublic class ClassFinalizer 35b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoextends SimplifiedVisitor 36b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimplements ClassVisitor 37b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato{ 38b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato private final ClassVisitor extraClassVisitor; 39b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 40b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 41b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato /** 42b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Creates a new ClassFinalizer. 43b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 44b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public ClassFinalizer() 45b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 46b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato this(null); 47b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 48b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 49b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 50b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato /** 51b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Creates a new ClassFinalizer. 52b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * @param extraClassVisitor an optional extra visitor for all finalized 53b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * classes. 54b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 55b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public ClassFinalizer(ClassVisitor extraClassVisitor) 56b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 57b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato this.extraClassVisitor = extraClassVisitor; 58b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 59b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 60b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 61b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Implementations for ClassVisitor. 62b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 63b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public void visitProgramClass(ProgramClass programClass) 64b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 65b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // If the class is not final/interface/abstract, 66b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // and it is not being kept, 67b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // and it doesn't have any subclasses, 68b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // then make it final. 69b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato if ((programClass.u2accessFlags & (ClassConstants.INTERNAL_ACC_FINAL | 70b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato ClassConstants.INTERNAL_ACC_INTERFACE | 71b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato ClassConstants.INTERNAL_ACC_ABSTRACT)) == 0 && 72b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato !KeepMarker.isKept(programClass) && 73b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato programClass.subClasses == null) 74b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 75b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato programClass.u2accessFlags |= ClassConstants.INTERNAL_ACC_FINAL; 76b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 77b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Visit the class, if required. 78b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato if (extraClassVisitor != null) 79b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 80b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato extraClassVisitor.visitProgramClass(programClass); 81b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 82b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 83b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 84b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato} 85