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/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2014 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);
}
}
}
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