1 /* VMInstrumentationImpl.java -- interface for the GNU implementation 2 of InstrumentationImpl 3 Copyright (C) 2005, 2010 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 VMInstrumentationImpl()52 private VMInstrumentationImpl() {} // Prohibits instantiation. 53 54 /** 55 * Returns if the current JVM supports class redefinition 56 * 57 * @return true if the current JVM supports class redefinition 58 */ isRedefineClassesSupported()59 static native boolean isRedefineClassesSupported(); 60 61 /** 62 * Redefines classes given as parameters. The method has to call 63 * the callTransformers from InstrumentationImpl 64 * 65 * @param inst an instrumentation object 66 * @param definitions an array of bytecode<->class correspondance 67 * 68 * @throws ClassNotFoundException if a class cannot be found 69 * @throws UnmodifiableClassException if a class cannot be modified 70 * @throws UnsupportedOperationException if the JVM does not support 71 * redefinition or the redefinition made unsupported changes 72 * @throws ClassFormatError if a class file is not valid 73 * @throws NoClassDefFoundError if a class name is not equal to the name 74 * in the class file specified 75 * @throws UnsupportedClassVersionError if the class file version numbers 76 * are unsupported 77 * @throws ClassCircularityError if circularity occured with the new 78 * classes 79 * @throws LinkageError if a linkage error occurs 80 */ redefineClasses(Instrumentation inst, ClassDefinition[] definitions)81 static native void redefineClasses(Instrumentation inst, 82 ClassDefinition[] definitions); 83 84 /** 85 * Get all the classes loaded by the JVM. 86 * 87 * @return an array containing all the classes loaded by the JVM. The array 88 * is empty if no class is loaded. 89 */ getAllLoadedClasses()90 static native Class[] getAllLoadedClasses(); 91 92 /** 93 * Get all the classes loaded by a given class loader 94 * 95 * @param loader the loader 96 * 97 * @return an array containing all the classes loaded by the given loader. 98 * The array is empty if no class was loaded by the loader. 99 */ getInitiatedClasses(ClassLoader loader)100 static native Class[] getInitiatedClasses(ClassLoader loader); 101 102 /** 103 * Get the size of an object. The object is not null 104 * 105 * @param objectToSize the object 106 * @return the size of the object 107 */ getObjectSize(Object objectToSize)108 static native long getObjectSize(Object objectToSize); 109 110 } 111