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/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2019 Guardsquare NV
*
* 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.util.SimplifiedVisitor;
import proguard.classfile.visitor.*;
/**
* This SimpleUsageMarker keeps track of the shortest dependency chains.
*
* @author Johan Leys
*/
public class ShortestUsageMarker
extends SimpleUsageMarker
{
// A field acting as a parameter to the visitor methods.
public ShortestUsageMark currentUsageMark;
// A utility object to check for direct or indirect references.
private final MyReferenceChecker referenceChecker = new MyReferenceChecker();
public void setCurrentUsageMark(ShortestUsageMark currentUsageMark)
{
this.currentUsageMark = currentUsageMark;
}
// Implementations for SimpleUsageMarker.
public void markAsUsed(VisitorAccepter visitorAccepter)
{
Object visitorInfo = visitorAccepter.getVisitorInfo();
ShortestUsageMark shortestUsageMark =
visitorInfo instanceof ShortestUsageMark &&
!((ShortestUsageMark)visitorInfo).isCertain() &&
!currentUsageMark.isShorter((ShortestUsageMark)visitorInfo) ?
new ShortestUsageMark((ShortestUsageMark)visitorInfo, true):
currentUsageMark;
visitorAccepter.setVisitorInfo(shortestUsageMark);
}
public boolean isUsed(VisitorAccepter visitorAccepter)
{
Object visitorInfo = visitorAccepter.getVisitorInfo();
return visitorInfo != null &&
visitorInfo instanceof ShortestUsageMark &&
((ShortestUsageMark)visitorInfo).isCertain();
}
public boolean shouldBeMarkedAsUsed(ProgramClass programClass)
{
Object visitorInfo = programClass.getVisitorInfo();
return visitorInfo == null ||
!(visitorInfo instanceof ShortestUsageMark) ||
!((ShortestUsageMark)visitorInfo).isCertain() ||
currentUsageMark.isShorter((ShortestUsageMark)visitorInfo) &&
!referencesClassMember(currentUsageMark, programClass);
}
public boolean shouldBeMarkedAsUsed(ProgramClass programClass,
ProgramMember programMember)
{
Object visitorInfo = programMember.getVisitorInfo();
return visitorInfo == null ||
!(visitorInfo instanceof ShortestUsageMark) ||
!((ShortestUsageMark)visitorInfo).isCertain() ||
currentUsageMark.isShorter((ShortestUsageMark)visitorInfo) &&
!referencesClass(currentUsageMark, programClass);
}
public boolean shouldBeMarkedAsUsed(VisitorAccepter visitorAccepter)
{
Object visitorInfo = visitorAccepter.getVisitorInfo();
return visitorInfo == null ||
!(visitorInfo instanceof ShortestUsageMark) ||
!((ShortestUsageMark)visitorInfo).isCertain() ||
currentUsageMark.isShorter((ShortestUsageMark)visitorInfo);
}
public void markAsPossiblyUsed(VisitorAccepter visitorAccepter)
{
visitorAccepter.setVisitorInfo(new ShortestUsageMark(currentUsageMark, false));
}
public boolean shouldBeMarkedAsPossiblyUsed(ProgramClass programClass,
ProgramMember programMember)
{
Object visitorInfo = programMember.getVisitorInfo();
return visitorInfo == null ||
!(visitorInfo instanceof ShortestUsageMark) ||
currentUsageMark.isShorter((ShortestUsageMark)visitorInfo) &&
// Do not overwrite a certain mark with a shorter potential mark.
!((ShortestUsageMark)visitorInfo).isCertain() &&
!referencesClass(currentUsageMark, programClass);
}
public boolean shouldBeMarkedAsPossiblyUsed(VisitorAccepter visitorAccepter)
{
Object visitorInfo = visitorAccepter.getVisitorInfo();
return visitorInfo == null ||
!(visitorInfo instanceof ShortestUsageMark) ||
currentUsageMark.isShorter((ShortestUsageMark)visitorInfo) &&
// Do not overwrite a certain mark with a shorter potential mark.
!((ShortestUsageMark)visitorInfo).isCertain();
}
public boolean isPossiblyUsed(VisitorAccepter visitorAccepter)
{
Object visitorInfo = visitorAccepter.getVisitorInfo();
return visitorInfo != null &&
visitorInfo instanceof ShortestUsageMark &&
!((ShortestUsageMark)visitorInfo).isCertain();
}
protected ShortestUsageMark getShortestUsageMark(VisitorAccepter visitorAccepter)
{
Object visitorInfo = visitorAccepter.getVisitorInfo();
return (ShortestUsageMark)visitorInfo;
}
// Small utility methods.
/**
* Returns whether the given usage mark references the given class,
* directly or indirectly.
*/
private boolean referencesClass(ShortestUsageMark shortestUsageMark,
Clazz clazz)
{
return referenceChecker.referencesClass(shortestUsageMark, clazz);
}
/**
* Returns whether the given usage mark references a member of the given
* class, directly or indirectly.
*/
private boolean referencesClassMember(ShortestUsageMark shortestUsageMark,
Clazz clazz)
{
return referenceChecker.referencesClassMember(shortestUsageMark, clazz);
}
/**
* This class checks whether a given usage mark is caused by a given
* class or a member of a given class, directly or indirectly.
*/
private class MyReferenceChecker
extends SimplifiedVisitor
implements ClassVisitor,
MemberVisitor
{
private Clazz checkClass;
private boolean checkMember;
private boolean isReferencing;
public boolean referencesClass(ShortestUsageMark shortestUsageMark,
Clazz clazz)
{
checkClass = clazz;
checkMember = false;
isReferencing = false;
checkReferenceFrom(shortestUsageMark);
return isReferencing;
}
public boolean referencesClassMember(ShortestUsageMark shortestUsageMark,
Clazz clazz)
{
checkClass = clazz;
checkMember = true;
isReferencing = false;
checkReferenceFrom(shortestUsageMark);
return isReferencing;
}
// Implementations for ClassVisitor.
public void visitLibraryClass(LibraryClass libraryClass) {}
public void visitProgramClass(ProgramClass programClass)
{
checkReferenceFrom(programClass);
}
// Implementations for MemberVisitor.
public void visitLibraryField(LibraryClass libraryClass, LibraryField libraryField) {}
public void visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod) {}
public void visitProgramField(ProgramClass programClass, ProgramField programField)
{
checkReferenceFrom(programField);
}
public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
{
checkReferenceFrom(programMethod);
}
// Small utility members.
private void checkReferenceFrom(VisitorAccepter visitorAccepter)
{
// Check the causing class or member, if still necessary.
if (!isReferencing)
{
checkReferenceFrom(getShortestUsageMark(visitorAccepter));
}
}
private void checkReferenceFrom(ShortestUsageMark shortestUsageMark)
{
// Check whether the class is marked because of a member of the
// class, or the class member is marked because of the class.
isReferencing = checkMember ?
shortestUsageMark.isCausedByMember(checkClass) :
shortestUsageMark.isCausedBy(checkClass);
shortestUsageMark.acceptClassVisitor(this);
shortestUsageMark.acceptMemberVisitor(this);
}
}
}