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Diffstat (limited to 'gcc-4.4.3/libjava/classpath/gnu/java/lang/InstrumentationImpl.java')
| -rw-r--r-- | gcc-4.4.3/libjava/classpath/gnu/java/lang/InstrumentationImpl.java | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/gcc-4.4.3/libjava/classpath/gnu/java/lang/InstrumentationImpl.java b/gcc-4.4.3/libjava/classpath/gnu/java/lang/InstrumentationImpl.java new file mode 100644 index 000000000..2425b35c8 --- /dev/null +++ b/gcc-4.4.3/libjava/classpath/gnu/java/lang/InstrumentationImpl.java @@ -0,0 +1,241 @@ +/* InstrumentationImpl.java -- GNU implementation of + java.lang.instrument.Instrumentation + Copyright (C) 2005, 2006 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.Instrumentation; +import java.lang.instrument.ClassFileTransformer; +import java.lang.instrument.ClassDefinition; +import java.lang.instrument.UnmodifiableClassException; +import java.lang.instrument.IllegalClassFormatException; + +import java.security.ProtectionDomain; + +import java.util.ArrayList; +import java.util.Iterator; + +/** + * An Instrumentation object has transformers that will + * be called each time a class is defined or redefined. + * The object is given to a <code>premain</code> function + * that is called before the <code>main</code> function. + * + * @author Nicolas Geoffray (nicolas.geoffray@menlina.com) + * @since 1.5 + */ +public final class InstrumentationImpl implements Instrumentation +{ + + /* List of transformers */ + private ArrayList<ClassFileTransformer> transformers = + new ArrayList<ClassFileTransformer>(); + + + InstrumentationImpl() + { + } + + /** + * Adds a <code>ClassFileTransformer</class> object + * to the instrumentation. Each time a class is defined + * or redefined, the <code>transform</code> method of the + * <code>transformer</code> object is called. + * + * @param transformer the transformer to add + * @throws NullPointerException if transformer is null + */ + public void addTransformer(ClassFileTransformer transformer) + { + if (transformer == null) + throw new NullPointerException(); + synchronized(transformers) + { + transformers.add(transformer); + } + } + + /** + * Removes the given transformer from the set of transformers + * this Instrumentation object has. + * + * @param transformer the transformer to remove + * @return true if the transformer was found and removed, false if + * the transformer was not found + * @throws NullPointerException if transformer is null + */ + public boolean removeTransformer(ClassFileTransformer transformer) + { + if (transformer == null) + throw new NullPointerException(); + + boolean result; + synchronized (transformers) + { + result = transformers.remove(transformer); + } + return result; + } + + /** + * Returns if the current JVM supports class redefinition + * + * @return true if the current JVM supports class redefinition + */ + public boolean isRedefineClassesSupported() + { + return VMInstrumentationImpl.isRedefineClassesSupported(); + } + + /** + * Redefine classes present in the definitions array, with + * the corresponding class files. + * + * @param definitions an array of classes to redefine + * + * @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 + * @throws NullPointerException if the definitions array is null, or any + * of its element + * + * @see isRedefineClassesSupported() + * @see addTransformer(java.lang.instrument.ClassFileTransformer) + * @see ClassFileTransformer + */ + public void redefineClasses(ClassDefinition[] definitions) + throws ClassNotFoundException, + UnmodifiableClassException + { + if (!isRedefineClassesSupported()) + throw new UnsupportedOperationException(); + + VMInstrumentationImpl.redefineClasses(this, 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. + */ + public Class[] getAllLoadedClasses() + { + return VMInstrumentationImpl.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. + */ + public Class[] getInitiatedClasses(ClassLoader loader) + { + return VMInstrumentationImpl.getInitiatedClasses(loader); + } + + /** + * Get the size of an object. + * + * @param objectToSize the object + * @return the size of the object + * @throws NullPointerException if objectToSize is null. + */ + public long getObjectSize(Object objectToSize) + { + // We alleviate the VM work + if (objectToSize == null) + throw new NullPointerException(); + return VMInstrumentationImpl.getObjectSize(objectToSize); + } + + /** + * Called by the VM or redefineClasses to call each transformer + * + * @param loader the loader of the class + * @param className the name of the class with packages separated with "/" + * @param classBeingRedefined the class being redefined if it's the case, + * null otherwise + * @param protectionDomain the protection domain of the class being defined + * or redefined + * @param classfileBuffer the input byte buffer in class file format + * + * @return the new class file + */ + public byte[] callTransformers(ClassLoader loader, String className, + Class<?> classBeingRedefined, ProtectionDomain protectionDomain, + byte[] classfileBuffer) + { + byte[] newBuffer = null; + byte[] oldBuffer = classfileBuffer; + ClassFileTransformer current; + synchronized (transformers) + { + Iterator<ClassFileTransformer> i = transformers.iterator(); + while (i.hasNext()) + { + current = i.next(); + try + { + newBuffer = current.transform(loader, className, + classBeingRedefined, protectionDomain, oldBuffer); + } + catch (IllegalClassFormatException ignored) + { + //IGNORED + } + if (newBuffer != null) + oldBuffer = newBuffer; + } + } + return oldBuffer; + } +} |