1 /*
2 * Copyright (c) 2003, 2016, 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 #ifndef SHARE_VM_SERVICES_CLASSLOADINGSERVICE_HPP
26 #define SHARE_VM_SERVICES_CLASSLOADINGSERVICE_HPP
27
28 #include "logging/log.hpp"
29 #include "runtime/handles.hpp"
30 #include "runtime/perfData.hpp"
31 #include "utilities/growableArray.hpp"
32 #include "utilities/macros.hpp"
33
34 class InstanceKlass;
35
36 // VM monitoring and management support for the Class Loading subsystem
37 class ClassLoadingService : public AllStatic {
38 private:
39 // Counters for classes loaded from class files
40 static PerfCounter* _classes_loaded_count;
41 static PerfCounter* _classes_unloaded_count;
42 static PerfCounter* _classbytes_loaded;
43 static PerfCounter* _classbytes_unloaded;
44
45 // Counters for classes loaded from shared archive
46 static PerfCounter* _shared_classes_loaded_count;
47 static PerfCounter* _shared_classes_unloaded_count;
48 static PerfCounter* _shared_classbytes_loaded;
49 static PerfCounter* _shared_classbytes_unloaded;
50
51 static PerfVariable* _class_methods_size;
52
53 static size_t compute_class_size(InstanceKlass* k);
54
55 public:
56 static void init();
57
58 static bool get_verbose() { return log_is_enabled(Info, class, load); }
59 static bool set_verbose(bool verbose);
60 static void reset_trace_class_unloading() NOT_MANAGEMENT_RETURN;
61
62 static jlong loaded_class_count() {
63 return _classes_loaded_count->get_value() + _shared_classes_loaded_count->get_value();
64 }
65 static jlong unloaded_class_count() {
66 return _classes_unloaded_count->get_value() + _shared_classes_unloaded_count->get_value();
67 }
68 static jlong loaded_class_bytes() {
69 if (UsePerfData) {
70 return _classbytes_loaded->get_value() + _shared_classbytes_loaded->get_value();
71 } else {
72 return -1;
73 }
74 }
75 static jlong unloaded_class_bytes() {
76 if (UsePerfData) {
77 return _classbytes_unloaded->get_value() + _shared_classbytes_unloaded->get_value();
78 } else {
79 return -1;
80 }
81 }
82
83 static jlong loaded_shared_class_count() {
84 return _shared_classes_loaded_count->get_value();
85 }
86 static jlong unloaded_shared_class_count() {
87 return _shared_classes_unloaded_count->get_value();
88 }
89 static jlong loaded_shared_class_bytes() {
90 if (UsePerfData) {
91 return _shared_classbytes_loaded->get_value();
92 } else {
93 return -1;
94 }
95 }
96 static jlong unloaded_shared_class_bytes() {
97 if (UsePerfData) {
98 return _shared_classbytes_unloaded->get_value();
99 } else {
100 return -1;
101 }
102 }
103 static jlong class_method_data_size() {
104 return (UsePerfData ? _class_methods_size->get_value() : -1);
105 }
106
107 static void notify_class_loaded(InstanceKlass* k, bool shared_class)
108 NOT_MANAGEMENT_RETURN;
109 // All unloaded classes are non-shared
110 static void notify_class_unloaded(InstanceKlass* k) NOT_MANAGEMENT_RETURN;
111 static void add_class_method_size(int size) {
112 #if INCLUDE_MANAGEMENT
113 if (UsePerfData) {
114 _class_methods_size->inc(size);
115 }
116 #endif // INCLUDE_MANAGEMENT
117 }
118 };
119
120 // FIXME: make this piece of code to be shared by M&M and JVMTI
121 class LoadedClassesEnumerator : public StackObj {
122 private:
123 static GrowableArray<KlassHandle>* _loaded_classes;
124 // _current_thread is for creating a KlassHandle with a faster version constructor
125 static Thread* _current_thread;
126
127 GrowableArray<KlassHandle>* _klass_handle_array;
128
129 public:
130 LoadedClassesEnumerator(Thread* cur_thread);
131
132 int num_loaded_classes() { return _klass_handle_array->length(); }
133 KlassHandle get_klass(int index) { return _klass_handle_array->at(index); }
134
135 static void add_loaded_class(Klass* k) {
136 // FIXME: For now - don't include array klasses
137 // The spec is unclear at this point to count array klasses or not
138 // and also indirect creation of array of super class and secondaries
139 //
140 // for (Klass* l = k; l != NULL; l = l->array_klass_or_null()) {
141 // KlassHandle h(_current_thread, l);
142 // _loaded_classes->append(h);
143 // }
144 if (k->is_instance_klass()) {
145 KlassHandle h(_current_thread, k);
146 _loaded_classes->append(h);
147 }
148 }
149 };
150
151 #endif // SHARE_VM_SERVICES_CLASSLOADINGSERVICE_HPP