Package cuchaz.enigma.bytecode

Source Code of cuchaz.enigma.bytecode.InnerClassWriter

/*******************************************************************************
* Copyright (c) 2014 Jeff Martin.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the GNU Public License v3.0
* which accompanies this distribution, and is available at
* http://www.gnu.org/licenses/gpl.html
*
* Contributors:
*     Jeff Martin - initial API and implementation
******************************************************************************/
package cuchaz.enigma.bytecode;

import java.util.Collection;

import javassist.CtClass;
import javassist.bytecode.AccessFlag;
import javassist.bytecode.ConstPool;
import javassist.bytecode.Descriptor;
import javassist.bytecode.EnclosingMethodAttribute;
import javassist.bytecode.InnerClassesAttribute;
import cuchaz.enigma.Constants;
import cuchaz.enigma.analysis.JarIndex;
import cuchaz.enigma.mapping.BehaviorEntry;
import cuchaz.enigma.mapping.ClassEntry;

public class InnerClassWriter
{
  private JarIndex m_jarIndex;
 
  public InnerClassWriter( JarIndex jarIndex )
  {
    m_jarIndex = jarIndex;
  }
 
  public void write( CtClass c )
  {
    // is this an inner or outer class?
    String obfInnerClassName = new ClassEntry( Descriptor.toJvmName( c.getName() ) ).getSimpleName();
    String obfOuterClassName = m_jarIndex.getOuterClass( obfInnerClassName );
    if( obfOuterClassName == null )
    {
      // this is an outer class
      obfOuterClassName = Descriptor.toJvmName( c.getName() );
    }
    else
    {
      // this is an inner class, rename it to outer$inner
      ClassEntry obfClassEntry = new ClassEntry( obfOuterClassName + "$" + obfInnerClassName );
      c.setName( obfClassEntry.getName() );
     
      BehaviorEntry caller = m_jarIndex.getAnonymousClassCaller( obfInnerClassName );
      if( caller != null )
      {
        // write the enclosing method attribute
        if( caller.getName().equals( "<clinit>" ) )
        {
          c.getClassFile().addAttribute( new EnclosingMethodAttribute(
            c.getClassFile().getConstPool(),
            caller.getClassName()
          ) );
        }
        else
        {
          c.getClassFile().addAttribute( new EnclosingMethodAttribute(
            c.getClassFile().getConstPool(),
            caller.getClassName(),
            caller.getName(),
            caller.getSignature()
          ) );
        }
      }
    }
   
    // write the inner classes if needed
    Collection<String> obfInnerClassNames = m_jarIndex.getInnerClasses( obfOuterClassName );
    if( obfInnerClassNames != null && !obfInnerClassNames.isEmpty() )
    {
      writeInnerClasses( c, obfOuterClassName, obfInnerClassNames );
    }
  }
 
  private void writeInnerClasses( CtClass c, String obfOuterClassName, Collection<String> obfInnerClassNames )
  {
    InnerClassesAttribute attr = new InnerClassesAttribute( c.getClassFile().getConstPool() );
    c.getClassFile().addAttribute( attr );
    for( String obfInnerClassName : obfInnerClassNames )
    {
      // get the new inner class name
      ClassEntry obfClassEntry = new ClassEntry( obfOuterClassName + "$" + obfInnerClassName );
     
      // here's what the JVM spec says about the InnerClasses attribute
      // append( inner, outer of inner if inner is member of outer 0 ow, name after $ if inner not anonymous 0 ow, flags );
     
      // update the attribute with this inner class
      ConstPool constPool = c.getClassFile().getConstPool();
      int innerClassIndex = constPool.addClassInfo( obfClassEntry.getName() );
      int outerClassIndex = 0;
      int innerClassSimpleNameIndex = 0;
      if( !m_jarIndex.isAnonymousClass( obfInnerClassName ) )
      {
        outerClassIndex = constPool.addClassInfo( obfClassEntry.getOuterClassName() );
        innerClassSimpleNameIndex = constPool.addUtf8Info( obfClassEntry.getInnerClassName() );
      }
     
      attr.append(
        innerClassIndex,
        outerClassIndex,
        innerClassSimpleNameIndex,
        c.getClassFile().getAccessFlags() & ~AccessFlag.SUPER
      );
     
      /* DEBUG
      System.out.println( String.format( "\tOBF: %s -> ATTR: %s,%s,%s (replace %s with %s)",
        obfClassEntry,
        attr.outerClass( attr.tableLength() - 1 ),
        attr.innerClass( attr.tableLength() - 1 ),
        attr.innerName( attr.tableLength() - 1 ),
        Constants.NonePackage + "/" + obfInnerClassName,
        obfClassEntry.getName()
      ) );
      */
     
      // make sure the outer class references only the new inner class names
      c.replaceClassName( Constants.NonePackage + "/" + obfInnerClassName, obfClassEntry.getName() );
    }
  }
}
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