/*

 * 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