jdk8-mips64-public/hotspot: src/share/vm/services/classLoadingService.hpp@4102b59539ce

8005012: Add WB APIs to better support NMT testing
Summary: Add WB API functions to enable better NMT testing
Reviewed-by: dholmes, zgu

     1 /*

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

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

     4  *

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

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

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

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

    13  * accompanied this code).

    14  *

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

    16  * 2 along with this work; if not, write to the Free Software Foundation,

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

    18  *

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

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

    21  * questions.

    22  *

    23  */

    25 #ifndef SHARE_VM_SERVICES_CLASSLOADINGSERVICE_HPP

    26 #define SHARE_VM_SERVICES_CLASSLOADINGSERVICE_HPP

    28 #include "runtime/handles.hpp"

    29 #include "runtime/perfData.hpp"

    30 #include "utilities/growableArray.hpp"

    32 class InstanceKlass;

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

    35 class ClassLoadingService : public AllStatic {

    36 private:

    37   // Counters for classes loaded from class files

    38   static PerfCounter*  _classes_loaded_count;

    39   static PerfCounter*  _classes_unloaded_count;

    40   static PerfCounter*  _classbytes_loaded;

    41   static PerfCounter*  _classbytes_unloaded;

    43   // Counters for classes loaded from shared archive

    44   static PerfCounter*  _shared_classes_loaded_count;

    45   static PerfCounter*  _shared_classes_unloaded_count;

    46   static PerfCounter*  _shared_classbytes_loaded;

    47   static PerfCounter*  _shared_classbytes_unloaded;

    49   static PerfVariable* _class_methods_size;

    51   static size_t compute_class_size(InstanceKlass* k);

    53 public:

    54   static void init();

    56   static bool get_verbose() { return TraceClassLoading; }

    57   static bool set_verbose(bool verbose);

    58   static void reset_trace_class_unloading() NOT_MANAGEMENT_RETURN;

    60   static jlong loaded_class_count() {

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

    62   }

    63   static jlong unloaded_class_count() {

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

    65   }

    66   static jlong loaded_class_bytes() {

    67     if (UsePerfData) {

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

    69     } else {

    70       return -1;

    71     }

    72   }

    73   static jlong unloaded_class_bytes() {

    74     if (UsePerfData) {

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

    76     } else {

    77       return -1;

    78     }

    79   }

    81   static jlong loaded_shared_class_count() {

    82     return _shared_classes_loaded_count->get_value();

    83   }

    84   static jlong unloaded_shared_class_count() {

    85     return _shared_classes_unloaded_count->get_value();

    86   }

    87   static jlong loaded_shared_class_bytes() {

    88     if (UsePerfData) {

    89       return _shared_classbytes_loaded->get_value();

    90     } else {

    91       return -1;

    92     }

    93   }

    94   static jlong unloaded_shared_class_bytes() {

    95     if (UsePerfData) {

    96       return _shared_classbytes_unloaded->get_value();

    97     } else {

    98       return -1;

    99     }

   100   }

   101   static jlong class_method_data_size() {

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

   103   }

   105   static void notify_class_loaded(InstanceKlass* k, bool shared_class)

   106       NOT_MANAGEMENT_RETURN;

   107   // All unloaded classes are non-shared

   108   static void notify_class_unloaded(InstanceKlass* k) NOT_MANAGEMENT_RETURN;

   109   static void add_class_method_size(int size) {

   110 #if INCLUDE_MANAGEMENT

   111     if (UsePerfData) {

   112       _class_methods_size->inc(size);

   113     }

   114 #endif // INCLUDE_MANAGEMENT

   115   }

   116 };

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

   119 class LoadedClassesEnumerator : public StackObj {

   120 private:

   121   static GrowableArray<KlassHandle>* _loaded_classes;

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

   123   static Thread*                     _current_thread;

   125   GrowableArray<KlassHandle>* _klass_handle_array;

   127 public:

   128   LoadedClassesEnumerator(Thread* cur_thread);

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

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

   133   static void add_loaded_class(Klass* k) {

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

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

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

   137     //

   138     // for (Klass* l = k; l != NULL; l = l->array_klass_or_null()) {

   139     //  KlassHandle h(_current_thread, l);

   140     //  _loaded_classes->append(h);

   141     // }

   142     KlassHandle h(_current_thread, k);

   143     _loaded_classes->append(h);

   144   }

   145 };

   147 #endif // SHARE_VM_SERVICES_CLASSLOADINGSERVICE_HPP

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