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diff --git a/libjava/classpath/vm/reference/gnu/java/lang/VMInstrumentationImpl.java b/libjava/classpath/vm/reference/gnu/java/lang/VMInstrumentationImpl.java
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+/* VMInstrumentationImpl.java -- interface for the GNU implementation
+   of InstrumentationImpl
+   Copyright (C) 2005  Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath 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, or (at your option)
+any later version.
+
+GNU Classpath 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 GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.java.lang;
+
+import java.lang.instrument.ClassDefinition;
+import java.lang.instrument.Instrumentation;
+
+/**
+ * @author Nicolas Geoffray (nicolas.geoffray@menlina.com)
+ * @since 1.5
+ */
+final class VMInstrumentationImpl
+{
+
+  /**
+   * Returns if the current JVM supports class redefinition
+   *
+   * @return true if the current JVM supports class redefinition
+   */
+  static native boolean isRedefineClassesSupported();
+
+  /**
+   * Redefines classes given as parameters. The method has to call
+   * the callTransformers from InstrumentationImpl
+   *
+   * @param inst an instrumentation object
+   * @param definitions an array of bytecode<->class correspondance
+   *
+   * @throws ClassNotFoundException if a class cannot be found
+   * @throws UnmodifiableClassException if a class cannot be modified
+   * @throws UnsupportedOperationException if the JVM does not support
+   * redefinition or the redefinition made unsupported changes
+   * @throws ClassFormatError if a class file is not valid
+   * @throws NoClassDefFoundError if a class name is not equal to the name
+   * in the class file specified
+   * @throws UnsupportedClassVersionError if the class file version numbers
+   * are unsupported
+   * @throws ClassCircularityError if circularity occured with the new
+   * classes
+   * @throws LinkageError if a linkage error occurs
+   */
+  static native void redefineClasses(Instrumentation inst,
+      ClassDefinition[] definitions);
+
+  /**
+   * Get all the classes loaded by the JVM.
+   *
+   * @return an array containing all the classes loaded by the JVM. The array
+   * is empty if no class is loaded.
+   */
+  static native Class[] getAllLoadedClasses();
+
+  /**
+   * Get all the classes loaded by a given class loader
+   *
+   * @param loader the loader
+   *
+   * @return an array containing all the classes loaded by the given loader.
+   * The array is empty if no class was loaded by the loader.
+   */
+  static native Class[] getInitiatedClasses(ClassLoader loader);
+
+  /**
+   * Get the size of an object. The object is not null
+   *
+   * @param objectToSize the object
+   * @return the size of the object
+   */
+  static native long getObjectSize(Object objectToSize);
+
+}