1 /*
2 * Copyright (c) 2003, 2005, 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 */
24
25 class instanceKlass;
26
27 // VM monitoring and management support for the Class Loading subsystem
28 class ClassLoadingService : public AllStatic {
29 private:
30 // Counters for classes loaded from class files
31 static PerfCounter* _classes_loaded_count;
32 static PerfCounter* _classes_unloaded_count;
33 static PerfCounter* _classbytes_loaded;
34 static PerfCounter* _classbytes_unloaded;
35
36 // Counters for classes loaded from shared archive
37 static PerfCounter* _shared_classes_loaded_count;
38 static PerfCounter* _shared_classes_unloaded_count;
39 static PerfCounter* _shared_classbytes_loaded;
40 static PerfCounter* _shared_classbytes_unloaded;
41
42 static PerfVariable* _class_methods_size;
43
44 static size_t compute_class_size(instanceKlass* k);
45
46 public:
47 static void init();
48
49 static bool get_verbose() { return TraceClassLoading; }
50 static bool set_verbose(bool verbose);
51 static void reset_trace_class_unloading();
52
53 static jlong loaded_class_count() {
54 return _classes_loaded_count->get_value() + _shared_classes_loaded_count->get_value();
55 }
56 static jlong unloaded_class_count() {
57 return _classes_unloaded_count->get_value() + _shared_classes_unloaded_count->get_value();
58 }
59 static jlong loaded_class_bytes() {
60 if (UsePerfData) {
61 return _classbytes_loaded->get_value() + _shared_classbytes_loaded->get_value();
62 } else {
63 return -1;
64 }
65 }
66 static jlong unloaded_class_bytes() {
67 if (UsePerfData) {
68 return _classbytes_unloaded->get_value() + _shared_classbytes_unloaded->get_value();
69 } else {
70 return -1;
71 }
72 }
73
74 static jlong loaded_shared_class_count() {
75 return _shared_classes_loaded_count->get_value();
76 }
77 static jlong unloaded_shared_class_count() {
78 return _shared_classes_unloaded_count->get_value();
79 }
80 static jlong loaded_shared_class_bytes() {
81 if (UsePerfData) {
82 return _shared_classbytes_loaded->get_value();
83 } else {
84 return -1;
85 }
86 }
87 static jlong unloaded_shared_class_bytes() {
88 if (UsePerfData) {
89 return _shared_classbytes_unloaded->get_value();
90 } else {
91 return -1;
92 }
93 }
94 static jlong class_method_data_size() {
95 return (UsePerfData ? _class_methods_size->get_value() : -1);
96 }
97
98 static void notify_class_loaded(instanceKlass* k, bool shared_class);
99 // All unloaded classes are non-shared
100 static void notify_class_unloaded(instanceKlass* k);
101 static void add_class_method_size(int size) {
102 if (UsePerfData) {
103 _class_methods_size->inc(size);
104 }
105 }
106 };
107
108 // FIXME: make this piece of code to be shared by M&M and JVMTI
109 class LoadedClassesEnumerator : public StackObj {
110 private:
111 static GrowableArray<KlassHandle>* _loaded_classes;
112 // _current_thread is for creating a KlassHandle with a faster version constructor
113 static Thread* _current_thread;
114
115 GrowableArray<KlassHandle>* _klass_handle_array;
116
117 public:
118 LoadedClassesEnumerator(Thread* cur_thread);
119
120 int num_loaded_classes() { return _klass_handle_array->length(); }
121 KlassHandle get_klass(int index) { return _klass_handle_array->at(index); }
122
123 static void add_loaded_class(klassOop k) {
124 // FIXME: For now - don't include array klasses
125 // The spec is unclear at this point to count array klasses or not
126 // and also indirect creation of array of super class and secondaries
127 //
128 // for (klassOop l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) {
129 // KlassHandle h(_current_thread, l);
130 // _loaded_classes->append(h);
131 // }
132 KlassHandle h(_current_thread, k);
133 _loaded_classes->append(h);
134 }
135 };