memberreferencefixer.java

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/* $Id: MemberReferenceFixer.java,v 1.4.2.1 2006/01/16 22:57:55 eric Exp $
 *
 * ProGuard -- shrinking, optimization, and obfuscation of Java class files.
 *
 * Copyright (c) 2002-2006 Eric Lafortune ([e-mail])
 *
 * 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.annotation.*;
import proguard.classfile.visitor.*;

/**
 * This ClassFileVisitor fixes constant pool field and method references to
 * fields and methods whose names or descriptors have changed.
 *
 * @author Eric Lafortune
 */
public class MemberReferenceFixer
implements   ClassFileVisitor,
             CpInfoVisitor,
             MemberInfoVisitor,
             AttrInfoVisitor,
             AnnotationVisitor,
             ElementValueVisitor
{
    private static final boolean DEBUG = false;


    private ConstantPoolEditor constantPoolEditor = new ConstantPoolEditor();
    private StackSizeUpdater   stackSizeUpdater;

    // Parameter for the visitor methods.
    private int cpIndex;

    // Return values for the visitor methods.
    private boolean isInterfaceMethod;
    private boolean stackSizesMayHaveChanged;


    /**
     * Creates a new MemberReferenceFixer.
     * @param codeLength an estimate of the maximum length of all the code that
     *                   will be edited.
     */
    public MemberReferenceFixer(int codeLength)
    {
        stackSizeUpdater = new StackSizeUpdater(codeLength);
    }


    // Implementations for ClassFileVisitor.

    public void visitProgramClassFile(ProgramClassFile programClassFile)
    {
        stackSizesMayHaveChanged = false;

        // Fix the constant pool entries.
        for (int index = 1; index < programClassFile.u2constantPoolCount; index++)
        {
            CpInfo cpInfo = programClassFile.constantPool[index];
            if (cpInfo != null)
            {
                // Fix the entry, replacing it entirely if needed.
                this.cpIndex = index;

                cpInfo.accept(programClassFile, this);
            }
        }

        // Fix class members.
        programClassFile.fieldsAccept(this);
        programClassFile.methodsAccept(this);

        // Fix the attributes.
        programClassFile.attributesAccept(this);
    }


    public void visitLibraryClassFile(LibraryClassFile libraryClassFile)
    {
    }


    // Implementations for CpInfoVisitor.

    public void visitIntegerCpInfo(ClassFile classFile, IntegerCpInfo integerCpInfo) {}
    public void visitLongCpInfo(ClassFile classFile, LongCpInfo longCpInfo) {}
    public void visitFloatCpInfo(ClassFile classFile, FloatCpInfo floatCpInfo) {}
    public void visitDoubleCpInfo(ClassFile classFile, DoubleCpInfo doubleCpInfo) {}
    public void visitStringCpInfo(ClassFile classFile, StringCpInfo stringCpInfo) {}
    public void visitNameAndTypeCpInfo(ClassFile classFile, NameAndTypeCpInfo nameAndTypeCpInfo) {}
    public void visitUtf8CpInfo(ClassFile classFile, Utf8CpInfo utf8CpInfo) {}


    public void visitFieldrefCpInfo(ClassFile classFile, FieldrefCpInfo fieldrefCpInfo)
    {
        // Do we know the referenced field?
        MemberInfo referencedMemberInfo = fieldrefCpInfo.referencedMemberInfo;
        if (referencedMemberInfo != null)
        {
            ClassFile referencedClassFile = fieldrefCpInfo.referencedClassFile;

            // Does it have a new name or type?
            String newName = referencedMemberInfo.getName(referencedClassFile);
            String newType = referencedMemberInfo.getDescriptor(referencedClassFile);

            if (!fieldrefCpInfo.getName(classFile).equals(newName) ||
                !fieldrefCpInfo.getType(classFile).equals(newType))
            {
                if (DEBUG)
                {
                    debug(classFile, fieldrefCpInfo, referencedClassFile, referencedMemberInfo);
                }

                // Update the name and type index.
                fieldrefCpInfo.u2nameAndTypeIndex =
                    constantPoolEditor.addNameAndTypeCpInfo((ProgramClassFile)classFile,
                                                            newName,
                                                            newType);
            }
        }
    }


    public void visitInterfaceMethodrefCpInfo(ClassFile classFile, InterfaceMethodrefCpInfo interfaceMethodrefCpInfo)
    {
        // Do we know the referenced interface method?
        MemberInfo referencedMemberInfo = interfaceMethodrefCpInfo.referencedMemberInfo;
        if (referencedMemberInfo != null)
        {
            ClassFile referencedClassFile = interfaceMethodrefCpInfo.referencedClassFile;

            // Does it have a new name or type?
            String newName = referencedMemberInfo.getName(referencedClassFile);
            String newType = referencedMemberInfo.getDescriptor(referencedClassFile);

            if (!interfaceMethodrefCpInfo.getName(classFile).equals(newName) ||
                !interfaceMethodrefCpInfo.getType(classFile).equals(newType))
            {
                if (DEBUG)
                {
                    debug(classFile, interfaceMethodrefCpInfo, referencedClassFile, referencedMemberInfo);
                }

                // Update the name and type index.
                interfaceMethodrefCpInfo.u2nameAndTypeIndex =
                    constantPoolEditor.addNameAndTypeCpInfo((ProgramClassFile)classFile,
                                                            newName,
                                                            newType);

                // Remember that the stack sizes of the methods in this class
                // may have changed.
                stackSizesMayHaveChanged = true;
            }

            // Check if this is an interface method.
            isInterfaceMethod = true;
            classFile.constantPoolEntryAccept(interfaceMethodrefCpInfo.u2classIndex, this);

            // Has the method become a non-interface method?
            if (!isInterfaceMethod)
            {
                if (DEBUG)
                {
                    System.out.println("MemberReferenceFixer:");
                    System.out.println("  Class file     = "+classFile.getName());
                    System.out.println("  Ref class file = "+referencedClassFile.getName());
                    System.out.println("  Ref method     = "+interfaceMethodrefCpInfo.getName(classFile)+interfaceMethodrefCpInfo.getType(classFile));
                    System.out.println("    -> ordinary method");
                }

                // Replace the interface method reference by a method reference.
                ((ProgramClassFile)classFile).constantPool[this.cpIndex] =
                    new MethodrefCpInfo(interfaceMethodrefCpInfo.u2classIndex,
                                        interfaceMethodrefCpInfo.u2nameAndTypeIndex,
                                        referencedClassFile,
                                        referencedMemberInfo);
            }
        }
    }


    public void visitMethodrefCpInfo(ClassFile classFile, MethodrefCpInfo methodrefCpInfo)
    {
        // Do we know the referenced method?
        MemberInfo referencedMemberInfo = methodrefCpInfo.referencedMemberInfo;
        if (referencedMemberInfo != null)
        {
            ClassFile referencedClassFile = methodrefCpInfo.referencedClassFile;

            // Does it have a new name or type?
            String newName = referencedMemberInfo.getName(referencedClassFile);
            String newType = referencedMemberInfo.getDescriptor(referencedClassFile);

            if (!methodrefCpInfo.getName(classFile).equals(newName) ||
                !methodrefCpInfo.getType(classFile).equals(newType))
            {
                if (DEBUG)
                {
                    debug(classFile, methodrefCpInfo, referencedClassFile, referencedMemberInfo);
                }

                // Update the name and type index.
                methodrefCpInfo.u2nameAndTypeIndex =
                    constantPoolEditor.addNameAndTypeCpInfo((ProgramClassFile)classFile,
                                                            newName,
                                                            newType);

                // Remember that the stack sizes of the methods in this class
                // may have changed.
                stackSizesMayHaveChanged = true;
            }

            // Check if this is an interface method.
            isInterfaceMethod = false;
            classFile.constantPoolEntryAccept(methodrefCpInfo.u2classIndex, this);

            // Has the method become an interface method?
            if (isInterfaceMethod)