| /* |
| * ProGuard -- shrinking, optimization, obfuscation, and preverification |
| * of Java bytecode. |
| * |
| * Copyright (c) 2002-2009 Eric Lafortune (eric@graphics.cornell.edu) |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the Free |
| * Software Foundation; either version 2 of the License, or (at your option) |
| * any later version. |
| * |
| * This program is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| package proguard.optimize.info; |
| |
| import proguard.classfile.*; |
| import proguard.classfile.util.*; |
| import proguard.classfile.visitor.MemberVisitor; |
| |
| /** |
| * This MemberVisitor marks all methods that it visits as not having any side |
| * effects. It will make the SideEffectMethodMarker consider them as such |
| * without further analysis. |
| * |
| * @see SideEffectMethodMarker |
| * @author Eric Lafortune |
| */ |
| public class NoSideEffectMethodMarker |
| extends SimplifiedVisitor |
| implements MemberVisitor |
| { |
| // A visitor info flag to indicate the visitor accepter is being kept, |
| // but that it doesn't have any side effects. |
| private static final Object KEPT_BUT_NO_SIDE_EFFECTS = new Object(); |
| |
| |
| // Implementations for MemberVisitor. |
| |
| public void visitAnyMember(Clazz Clazz, Member member) |
| { |
| // Ignore any attempts to mark fields. |
| } |
| |
| |
| public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod) |
| { |
| markNoSideEffects(programMethod); |
| } |
| |
| |
| public void visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod) |
| { |
| markNoSideEffects(libraryMethod); |
| } |
| |
| |
| // Small utility methods. |
| |
| private static void markNoSideEffects(Method method) |
| { |
| MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method); |
| if (info != null) |
| { |
| info.setNoSideEffects(); |
| } |
| else |
| { |
| MethodLinker.lastMember(method).setVisitorInfo(KEPT_BUT_NO_SIDE_EFFECTS); |
| } |
| } |
| |
| |
| public static boolean hasNoSideEffects(Method method) |
| { |
| if (MethodLinker.lastVisitorAccepter(method).getVisitorInfo() == KEPT_BUT_NO_SIDE_EFFECTS) |
| { |
| return true; |
| } |
| |
| MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method); |
| return info != null && |
| info.hasNoSideEffects(); |
| } |
| } |