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/*
* 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.optimize.info;
import proguard.classfile.*;
import proguard.classfile.constant.*;
import proguard.classfile.constant.visitor.ConstantVisitor;
import proguard.classfile.util.SimplifiedVisitor;
import proguard.classfile.visitor.*;
/**
* This ClassVisitor marks all class members that can not be made private in the
* classes that it visits, and in the classes to which they refer.
*
* @author Eric Lafortune
*/
public class NonPrivateMemberMarker
extends SimplifiedVisitor
implements ClassVisitor,
ConstantVisitor,
MemberVisitor
{
private final MethodImplementationFilter filteredMethodMarker = new MethodImplementationFilter(this);
// Implementations for ClassVisitor.
public void visitProgramClass(ProgramClass programClass)
{
// Mark all referenced class members in different classes.
programClass.constantPoolEntriesAccept(this);
// Explicitly mark the <clinit> method.
programClass.methodAccept(ClassConstants.INTERNAL_METHOD_NAME_CLINIT,
ClassConstants.INTERNAL_METHOD_TYPE_CLINIT,
this);
// Explicitly mark the parameterless <init> method.
programClass.methodAccept(ClassConstants.INTERNAL_METHOD_NAME_INIT,
ClassConstants.INTERNAL_METHOD_TYPE_INIT,
this);
// Mark all methods that may have implementations.
programClass.methodsAccept(filteredMethodMarker);
}
public void visitLibraryClass(LibraryClass libraryClass)
{
// Go over all methods.
libraryClass.methodsAccept(this);
}
// Implementations for ConstantVisitor.
public void visitAnyConstant(Clazz clazz, Constant constant) {}
public void visitStringConstant(Clazz clazz, StringConstant stringConstant)
{
// The referenced class member, if any, can never be made private,
// even if it's in the same class.
stringConstant.referencedMemberAccept(this);
}
public void visitAnyRefConstant(Clazz clazz, RefConstant refConstant)
{
Clazz referencedClass = refConstant.referencedClass;
// Is it referring to a class member in another class?
// The class member might be in another class, or
// it may be referenced through another class.
if (referencedClass != null &&
!referencedClass.equals(clazz) ||
!refConstant.getClassName(clazz).equals(clazz.getName()))
{
// The referenced class member can never be made private.
refConstant.referencedMemberAccept(this);
}
}
// Implementations for MemberVisitor.
public void visitProgramField(ProgramClass programClass, ProgramField programField)
{
markCanNotBeMadePrivate(programField);
}
public void visitLibraryField(LibraryClass libraryClass, LibraryField libraryField)
{
markCanNotBeMadePrivate(libraryField);
}
public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
{
markCanNotBeMadePrivate(programMethod);
}
public void visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod)
{
markCanNotBeMadePrivate(libraryMethod);
}
// Small utility methods.
private static void markCanNotBeMadePrivate(Field field)
{
FieldOptimizationInfo info = FieldOptimizationInfo.getFieldOptimizationInfo(field);
if (info != null)
{
info.setCanNotBeMadePrivate();
}
}
/**
* Returns whether the given field can be made private.
*/
public static boolean canBeMadePrivate(Field field)
{
FieldOptimizationInfo info = FieldOptimizationInfo.getFieldOptimizationInfo(field);
return info != null &&
info.canBeMadePrivate();
}
private static void markCanNotBeMadePrivate(Method method)
{
MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method);
if (info != null)
{
info.setCanNotBeMadePrivate();
}
}
/**
* Returns whether the given method can be made private.
*/
public static boolean canBeMadePrivate(Method method)
{
MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method);
return info != null &&
info.canBeMadePrivate();
}
}
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