| /* |
| * ProGuard -- shrinking, optimization, obfuscation, and preverification |
| * of Java bytecode. |
| * |
| * Copyright (c) 2002-2013 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.shrink; |
| |
| import proguard.classfile.*; |
| import proguard.classfile.constant.*; |
| import proguard.classfile.constant.visitor.ConstantVisitor; |
| import proguard.classfile.util.SimplifiedVisitor; |
| import proguard.classfile.visitor.ClassVisitor; |
| |
| |
| /** |
| * This ClassVisitor recursively marks all interface |
| * classes that are being used in the visited class. |
| * |
| * @see UsageMarker |
| * |
| * @author Eric Lafortune |
| */ |
| public class InterfaceUsageMarker |
| extends SimplifiedVisitor |
| implements ClassVisitor, |
| ConstantVisitor |
| { |
| private final UsageMarker usageMarker; |
| |
| // Fields acting as a return parameters for several methods. |
| private boolean used; |
| private boolean anyUsed; |
| |
| |
| /** |
| * Creates a new InterfaceUsageMarker. |
| * @param usageMarker the usage marker that is used to mark the classes |
| * and class members. |
| */ |
| public InterfaceUsageMarker(UsageMarker usageMarker) |
| { |
| this.usageMarker = usageMarker; |
| } |
| |
| |
| // Implementations for ClassVisitor. |
| |
| public void visitProgramClass(ProgramClass programClass) |
| { |
| boolean classUsed = usageMarker.isUsed(programClass); |
| boolean classPossiblyUsed = usageMarker.isPossiblyUsed(programClass); |
| |
| if (classUsed || classPossiblyUsed) |
| { |
| // Check if any interfaces are being used. |
| boolean oldAnyUsed = anyUsed; |
| anyUsed = false; |
| |
| programClass.interfaceConstantsAccept(this); |
| |
| classUsed |= anyUsed; |
| anyUsed = oldAnyUsed; |
| |
| // Is this an interface with a preliminary mark? |
| if (classPossiblyUsed) |
| { |
| // Should it be included now? |
| if (classUsed) |
| { |
| // At least one if this interface's interfaces is being used. |
| // Mark this interface as well. |
| usageMarker.markAsUsed(programClass); |
| |
| // Mark this interface's name. |
| programClass.thisClassConstantAccept(this); |
| |
| // Mark the superclass (java/lang/Object). |
| programClass.superClassConstantAccept(this); |
| } |
| else |
| { |
| // Unmark this interface, so we don't bother looking at it again. |
| usageMarker.markAsUnused(programClass); |
| } |
| } |
| } |
| |
| // The return value. |
| used = classUsed; |
| } |
| |
| |
| public void visitLibraryClass(LibraryClass libraryClass) |
| { |
| // The return values. |
| used = true; |
| anyUsed = true; |
| } |
| |
| |
| // Implementations for ConstantVisitor. |
| |
| public void visitClassConstant(Clazz clazz, ClassConstant classConstant) |
| { |
| boolean classUsed = usageMarker.isUsed(classConstant); |
| |
| if (!classUsed) |
| { |
| // The ClassConstant isn't marked as being used yet. But maybe it |
| // should be included as an interface, so check the actual class. |
| classConstant.referencedClassAccept(this); |
| classUsed = used; |
| |
| if (classUsed) |
| { |
| // The class is being used. Mark the ClassConstant as being used |
| // as well. |
| usageMarker.markAsUsed(classConstant); |
| |
| clazz.constantPoolEntryAccept(classConstant.u2nameIndex, this); |
| } |
| } |
| |
| // The return values. |
| used = classUsed; |
| anyUsed |= classUsed; |
| } |
| |
| |
| public void visitUtf8Constant(Clazz clazz, Utf8Constant utf8Constant) |
| { |
| if (!usageMarker.isUsed(utf8Constant)) |
| { |
| usageMarker.markAsUsed(utf8Constant); |
| } |
| } |
| } |