libjava/classpath/vm/reference/gnu/java/lang/VMInstrumentationImpl.java

   1 /* VMInstrumentationImpl.java -- interface for the GNU implementation
   2    of InstrumentationImpl
   3    Copyright (C) 2005  Free Software Foundation, Inc.
   4
   5 This file is part of GNU Classpath.
   6
   7 GNU Classpath is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU Classpath is distributed in the hope that it will be useful, but
  13 WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Classpath; see the file COPYING.  If not, write to the
  19 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20 02110-1301 USA.
  21
  22 Linking this library statically or dynamically with other modules is
  23 making a combined work based on this library.  Thus, the terms and
  24 conditions of the GNU General Public License cover the whole
  25 combination.
  26
  27 As a special exception, the copyright holders of this library give you
  28 permission to link this library with independent modules to produce an
  29 executable, regardless of the license terms of these independent
  30 modules, and to copy and distribute the resulting executable under
  31 terms of your choice, provided that you also meet, for each linked
  32 independent module, the terms and conditions of the license of that
  33 module.  An independent module is a module which is not derived from
  34 or based on this library.  If you modify this library, you may extend
  35 this exception to your version of the library, but you are not
  36 obligated to do so.  If you do not wish to do so, delete this
  37 exception statement from your version. */
  38
  39
  40 package gnu.java.lang;
  41
  42 import java.lang.instrument.ClassDefinition;
  43 import java.lang.instrument.Instrumentation;
  44
  45 /**
  46  * @author Nicolas Geoffray (nicolas.geoffray@menlina.com)
  47  * @since 1.5
  48  */
  49 final class VMInstrumentationImpl
  50 {
  51
  52   /**
  53    * Returns if the current JVM supports class redefinition
  54    *
  55    * @return true if the current JVM supports class redefinition
  56    */
  57   static native boolean isRedefineClassesSupported();
  58
  59   /**
  60    * Redefines classes given as parameters. The method has to call
  61    * the callTransformers from InstrumentationImpl
  62    *
  63    * @param inst an instrumentation object
  64    * @param definitions an array of bytecode<->class correspondance
  65    *
  66    * @throws ClassNotFoundException if a class cannot be found
  67    * @throws UnmodifiableClassException if a class cannot be modified
  68    * @throws UnsupportedOperationException if the JVM does not support
  69    * redefinition or the redefinition made unsupported changes
  70    * @throws ClassFormatError if a class file is not valid
  71    * @throws NoClassDefFoundError if a class name is not equal to the name
  72    * in the class file specified
  73    * @throws UnsupportedClassVersionError if the class file version numbers
  74    * are unsupported
  75    * @throws ClassCircularityError if circularity occured with the new
  76    * classes
  77    * @throws LinkageError if a linkage error occurs
  78    */
  79   static native void redefineClasses(Instrumentation inst,
  80       ClassDefinition[] definitions);
  81
  82   /**
  83    * Get all the classes loaded by the JVM.
  84    *
  85    * @return an array containing all the classes loaded by the JVM. The array
  86    * is empty if no class is loaded.
  87    */
  88   static native Class[] getAllLoadedClasses();
  89
  90   /**
  91    * Get all the classes loaded by a given class loader
  92    *
  93    * @param loader the loader
  94    *
  95    * @return an array containing all the classes loaded by the given loader.
  96    * The array is empty if no class was loaded by the loader.
  97    */
  98   static native Class[] getInitiatedClasses(ClassLoader loader);
  99
 100   /**
 101    * Get the size of an object. The object is not null
 102    *
 103    * @param objectToSize the object
 104    * @return the size of the object
 105    */
 106   static native long getObjectSize(Object objectToSize);
 107
 108 }