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 */
24
25 #ifndef SHARE_VM_SERVICES_CLASSLOADINGSERVICE_HPP
26 #define SHARE_VM_SERVICES_CLASSLOADINGSERVICE_HPP
27
28 #include "runtime/handles.hpp"
29 #include "runtime/perfData.hpp"
30 #include "utilities/growableArray.hpp"
31
32 class InstanceKlass;
33
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;
42
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;
48
49 static PerfVariable* _class_methods_size;
50
51 static size_t compute_class_size(InstanceKlass* k);
52
53 public:
54 static void init();
55
56 static bool get_verbose() { return TraceClassLoading; }
57 static bool set_verbose(bool verbose);
58 static void reset_trace_class_unloading() NOT_MANAGEMENT_RETURN;
59
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 }
80
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 }
104
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 };
117
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;
124
125 GrowableArray<KlassHandle>* _klass_handle_array;
126
127 public:
128 LoadedClassesEnumerator(Thread* cur_thread);
129
130 int num_loaded_classes() { return _klass_handle_array->length(); }
131 KlassHandle get_klass(int index) { return _klass_handle_array->at(index); }
132
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 = Klass::cast(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 };
146
147 #endif // SHARE_VM_SERVICES_CLASSLOADINGSERVICE_HPP