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/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2017 Eric Lafortune @ GuardSquare
*
* 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.classfile.editor;
import proguard.classfile.*;
import proguard.classfile.attribute.*;
import proguard.classfile.attribute.visitor.AttributeVisitor;
import proguard.classfile.constant.Utf8Constant;
import proguard.classfile.util.*;
import proguard.classfile.visitor.ClassVisitor;
import java.util.Arrays;
/**
* This ClassVisitor sorts the interfaces of the program classes that it visits.
*
* @author Eric Lafortune
*/
public class InterfaceSorter
extends SimplifiedVisitor
implements ClassVisitor,
AttributeVisitor
{
private static final boolean DEBUG = false;
// Implementations for ClassVisitor.
public void visitProgramClass(ProgramClass programClass)
{
int[] interfaces = programClass.u2interfaces;
int interfacesCount = programClass.u2interfacesCount;
if (interfacesCount > 1)
{
// Sort the interfaces.
Arrays.sort(interfaces, 0, interfacesCount);
// Update the signature.
programClass.attributesAccept(this);
// Remove any duplicate entries.
boolean[] delete = null;
for (int index = 1; index < interfacesCount; index++)
{
if (interfaces[index] == interfaces[index - 1])
{
// Lazily create the array.
if (delete == null)
{
delete = new boolean[interfacesCount];
}
delete[index] = true;
}
}
if (delete != null)
{
new InterfaceDeleter(delete).visitProgramClass(programClass);
}
}
}
// Implementations for AttributeVisitor.
public void visitAnyAttribute(Clazz clazz, Attribute attribute) {}
public void visitSignatureAttribute(Clazz clazz, SignatureAttribute signatureAttribute)
{
Clazz[] referencedClasses = signatureAttribute.referencedClasses;
Clazz[] newReferencedClasses = referencedClasses == null ? null :
new Clazz[referencedClasses.length];
// Recompose the signature types in a string buffer.
StringBuffer newSignatureBuffer = new StringBuffer();
// Also update the array with referenced classes.
int referencedClassIndex = 0;
int newReferencedClassIndex = 0;
// Process the generic definitions and superclass.
InternalTypeEnumeration internalTypeEnumeration =
new InternalTypeEnumeration(signatureAttribute.getSignature(clazz));
// Copy the variable type declarations.
if (internalTypeEnumeration.hasFormalTypeParameters())
{
String type = internalTypeEnumeration.formalTypeParameters();
// Append the type.
newSignatureBuffer.append(type);
// Copy any referenced classes.
if (newReferencedClasses != null)
{
int classCount =
new DescriptorClassEnumeration(type).classCount();
for (int counter = 0; counter < classCount; counter++)
{
newReferencedClasses[newReferencedClassIndex++] =
referencedClasses[referencedClassIndex++];
}
}
if (DEBUG)
{
System.out.println("InterfaceDeleter: type parameters = " + type);
}
}
// Copy the super class type.
if (internalTypeEnumeration.hasMoreTypes())
{
String type = internalTypeEnumeration.nextType();
// Append the type.
newSignatureBuffer.append(type);
// Copy any referenced classes.
if (newReferencedClasses != null)
{
int classCount =
new DescriptorClassEnumeration(type).classCount();
for (int counter = 0; counter < classCount; counter++)
{
newReferencedClasses[newReferencedClassIndex++] =
referencedClasses[referencedClassIndex++];
}
}
if (DEBUG)
{
System.out.println("InterfaceSorter: super class type = " + type);
}
}
int firstReferencedInterfaceIndex = referencedClassIndex;
// Copy the interface types, based on the sorted interface classes.
// This has the advantage that we will disregard any interface types
// that are not in the interface classes, like in some versions of
// the Scala runtime library.
for (int interfaceIndex = 0; interfaceIndex < clazz.getInterfaceCount(); interfaceIndex++)
{
// Consider the interface class name.
String interfaceName = clazz.getInterfaceName(interfaceIndex);
referencedClassIndex = firstReferencedInterfaceIndex;
// Find the corresponding interface type.
InternalTypeEnumeration internalInterfaceTypeEnumeration =
new InternalTypeEnumeration(signatureAttribute.getSignature(clazz));
// Skip the superclass type.
internalInterfaceTypeEnumeration.nextType();
while (internalInterfaceTypeEnumeration.hasMoreTypes())
{
String type = internalInterfaceTypeEnumeration.nextType();
DescriptorClassEnumeration classEnumeration =
new DescriptorClassEnumeration(type);
int classCount =
classEnumeration.classCount();
classEnumeration.nextFluff();
if (interfaceName.equals(classEnumeration.nextClassName()))
{
// Append the type.
newSignatureBuffer.append(type);
// Copy any referenced classes.
if (newReferencedClasses != null)
{
for (int counter = 0; counter < classCount; counter++)
{
newReferencedClasses[newReferencedClassIndex++] =
referencedClasses[referencedClassIndex++];
}
}
if (DEBUG)
{
System.out.println("InterfaceSorter: interface type = " + type);
}
}
else
{
// Skip all referenced classes.
referencedClassIndex += classCount;
}
}
}
String newSignature = newSignatureBuffer.toString();
// Did the signature change?
if (!newSignature.equals(signatureAttribute.getSignature(clazz)))
{
// Update the signature.
((Utf8Constant)((ProgramClass)clazz).constantPool[signatureAttribute.u2signatureIndex]).setString(newSignatureBuffer.toString());
// Update the referenced classes.
signatureAttribute.referencedClasses = newReferencedClasses;
if (DEBUG)
{
System.out.println("InterfaceSorter: result = "+newSignature);
System.out.println("InterfaceSorter: referenced classes:");
if (newReferencedClasses != null)
{
for (int index = 0; index < newReferencedClasses.length; index++)
{
System.out.println(" #"+index+" "+newReferencedClasses[index]);
}
}
}
}
}
}
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