Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code 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

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #ifndef SHARE_VM_SERVICES_CLASSLOADINGSERVICE_HPP

 #define SHARE_VM_SERVICES_CLASSLOADINGSERVICE_HPP

 #include "runtime/handles.hpp"

 #include "runtime/perfData.hpp"

 #include "utilities/growableArray.hpp"

 class instanceKlass;

 // VM monitoring and management support for the Class Loading subsystem

 class ClassLoadingService : public AllStatic {

 private:

   // Counters for classes loaded from class files

   static PerfCounter*  _classes_loaded_count;

   static PerfCounter*  _classes_unloaded_count;

   static PerfCounter*  _classbytes_loaded;

   static PerfCounter*  _classbytes_unloaded;

   // Counters for classes loaded from shared archive

   static PerfCounter*  _shared_classes_loaded_count;

   static PerfCounter*  _shared_classes_unloaded_count;

   static PerfCounter*  _shared_classbytes_loaded;

   static PerfCounter*  _shared_classbytes_unloaded;

   static PerfVariable* _class_methods_size;

   static size_t compute_class_size(instanceKlass* k);

 public:

   static void init();

   static bool get_verbose() { return TraceClassLoading; }

   static bool set_verbose(bool verbose);

   static void reset_trace_class_unloading();

   static jlong loaded_class_count() {

     return _classes_loaded_count->get_value() + _shared_classes_loaded_count->get_value();

   }

   static jlong unloaded_class_count() {

     return _classes_unloaded_count->get_value() + _shared_classes_unloaded_count->get_value();

   }

   static jlong loaded_class_bytes() {

     if (UsePerfData) {

       return _classbytes_loaded->get_value() + _shared_classbytes_loaded->get_value();

     } else {

       return -1;

     }

   }

   static jlong unloaded_class_bytes() {

     if (UsePerfData) {

       return _classbytes_unloaded->get_value() + _shared_classbytes_unloaded->get_value();

     } else {

       return -1;

     }

   }

   static jlong loaded_shared_class_count() {

     return _shared_classes_loaded_count->get_value();

   }

   static jlong unloaded_shared_class_count() {

     return _shared_classes_unloaded_count->get_value();

   }

   static jlong loaded_shared_class_bytes() {

     if (UsePerfData) {

       return _shared_classbytes_loaded->get_value();

     } else {

       return -1;

     }

   }

   static jlong unloaded_shared_class_bytes() {

     if (UsePerfData) {

       return _shared_classbytes_unloaded->get_value();

     } else {

       return -1;

     }

   }

   static jlong class_method_data_size() {

     return (UsePerfData ? _class_methods_size->get_value() : -1);

   }

   static void notify_class_loaded(instanceKlass* k, bool shared_class);

   // All unloaded classes are non-shared

   static void notify_class_unloaded(instanceKlass* k);

   static void add_class_method_size(int size) {

     if (UsePerfData) {

       _class_methods_size->inc(size);

     }

   }

 };

 // FIXME: make this piece of code to be shared by M&M and JVMTI

 class LoadedClassesEnumerator : public StackObj {

 private:

   static GrowableArray<KlassHandle>* _loaded_classes;

   // _current_thread is for creating a KlassHandle with a faster version constructor

   static Thread*                     _current_thread;

   GrowableArray<KlassHandle>* _klass_handle_array;

 public:

   LoadedClassesEnumerator(Thread* cur_thread);

   int num_loaded_classes()         { return _klass_handle_array->length(); }

   KlassHandle get_klass(int index) { return _klass_handle_array->at(index); }

   static void add_loaded_class(klassOop k) {

     // FIXME: For now - don't include array klasses

     // The spec is unclear at this point to count array klasses or not

     // and also indirect creation of array of super class and secondaries

     //

     // for (klassOop l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) {

     //  KlassHandle h(_current_thread, l);

     //  _loaded_classes->append(h);

     // }

     KlassHandle h(_current_thread, k);

     _loaded_classes->append(h);

   }

 };

 #endif // SHARE_VM_SERVICES_CLASSLOADINGSERVICE_HPP