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; 22b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 23b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimport proguard.classfile.*; 24b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimport proguard.classfile.attribute.visitor.AttributeVisitor; 25b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimport proguard.classfile.editor.MethodInvocationFixer; 26b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimport proguard.classfile.util.SimplifiedVisitor; 27b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimport proguard.classfile.visitor.MemberVisitor; 28b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimport proguard.optimize.info.ParameterUsageMarker; 29b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimport proguard.optimize.peephole.VariableShrinker; 30b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 31b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato/** 32b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * This MemberVisitor makes all methods that it visits static, if their 'this' 33b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * parameters are unused. 34b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 35b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * @see ParameterUsageMarker 36b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * @see MethodInvocationFixer 37b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * @see VariableShrinker 38b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * @author Eric Lafortune 39b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 40b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratopublic class MethodStaticizer 41b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoextends SimplifiedVisitor 42b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimplements MemberVisitor, 43b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato AttributeVisitor 44b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato{ 45b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato private final MemberVisitor extraStaticMemberVisitor; 46b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 47b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 48b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato /** 49b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Creates a new MethodStaticizer. 50b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 51b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public MethodStaticizer() 52b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 53b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato this(null); 54b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 55b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 56b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 57b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato /** 58b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Creates a new MethodStaticizer with an extra visitor. 59b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * @param extraStaticMemberVisitor an optional extra visitor for all 60b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * methods that have been made static. 61b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 62b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public MethodStaticizer(MemberVisitor extraStaticMemberVisitor) 63b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 64b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato this.extraStaticMemberVisitor = extraStaticMemberVisitor; 65b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 66b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 67b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 68b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Implementations for MemberVisitor. 69b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 70b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod) 71b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 72b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Is the 'this' parameter being used? 73b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato if (!ParameterUsageMarker.isParameterUsed(programMethod, 0)) 74b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 75b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Make the method static. 76b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato programMethod.u2accessFlags = 77b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato (programMethod.getAccessFlags() & ~ClassConstants.INTERNAL_ACC_FINAL) | 78b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato ClassConstants.INTERNAL_ACC_STATIC; 79b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 80b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Visit the method, if required. 81b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato if (extraStaticMemberVisitor != null) 82b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 83b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato extraStaticMemberVisitor.visitProgramMethod(programClass, programMethod); 84b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 85b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 86b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 87b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato} 88