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.util.SimplifiedVisitor; 25b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimport proguard.classfile.visitor.MemberVisitor; 26b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimport proguard.evaluation.value.Value; 27b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimport proguard.optimize.evaluation.StoringInvocationUnit; 28b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 29b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato/** 30b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * This <code>MemberVisitor</code> delegates its visits to program class members 31b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * to another given <code>MemberVisitor</code>, but only when the visited 32b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * class member has been marked as a constant. 33b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 34b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * @see StoringInvocationUnit 35b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * @author Eric Lafortune 36b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 37b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratopublic class ConstantMemberFilter 38b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoextends SimplifiedVisitor 39b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimplements MemberVisitor 40b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato{ 41b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato private final MemberVisitor constantMemberVisitor; 42b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 43b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 44b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato /** 45b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Creates a new ConstantMemberFilter. 46b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * @param constantMemberVisitor the <code>MemberVisitor</code> to which 47b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * visits to constant members will be delegated. 48b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 49b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public ConstantMemberFilter(MemberVisitor constantMemberVisitor) 50b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 51b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato this.constantMemberVisitor = constantMemberVisitor; 52b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 53b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 54b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 55b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Implementations for MemberVisitor. 56b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 57b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public void visitProgramField(ProgramClass programClass, ProgramField programField) 58b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 59b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato Value value = StoringInvocationUnit.getFieldValue(programField); 60b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato if (value != null && 61b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato value.isParticular()) 62b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 63b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato constantMemberVisitor.visitProgramField(programClass, programField); 64b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 65b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 66b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 67b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 68b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod) 69b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 70b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato Value value = StoringInvocationUnit.getMethodReturnValue(programMethod); 71b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato if (value != null && 72b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato value.isParticular()) 73b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 74b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato constantMemberVisitor.visitProgramMethod(programClass, programMethod); 75b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 76b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 77b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato} 78