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comparison: src/share/vm/services/classLoadingService.hpp

src/share/vm/services/classLoadingService.hpp

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1 /*
2 * Copyright (c) 2003, 2013, 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 #include "utilities/macros.hpp"
32
33 class InstanceKlass;
34
35 // VM monitoring and management support for the Class Loading subsystem
36 class ClassLoadingService : public AllStatic {
37 private:
38 // Counters for classes loaded from class files
39 static PerfCounter* _classes_loaded_count;
40 static PerfCounter* _classes_unloaded_count;
41 static PerfCounter* _classbytes_loaded;
42 static PerfCounter* _classbytes_unloaded;
43
44 // Counters for classes loaded from shared archive
45 static PerfCounter* _shared_classes_loaded_count;
46 static PerfCounter* _shared_classes_unloaded_count;
47 static PerfCounter* _shared_classbytes_loaded;
48 static PerfCounter* _shared_classbytes_unloaded;
49
50 static PerfVariable* _class_methods_size;
51
52 static size_t compute_class_size(InstanceKlass* k);
53
54 public:
55 static void init();
56
57 static bool get_verbose() { return TraceClassLoading; }
58 static bool set_verbose(bool verbose);
59 static void reset_trace_class_unloading() NOT_MANAGEMENT_RETURN;
60
61 static jlong loaded_class_count() {
62 return _classes_loaded_count->get_value() + _shared_classes_loaded_count->get_value();
63 }
64 static jlong unloaded_class_count() {
65 return _classes_unloaded_count->get_value() + _shared_classes_unloaded_count->get_value();
66 }
67 static jlong loaded_class_bytes() {
68 if (UsePerfData) {
69 return _classbytes_loaded->get_value() + _shared_classbytes_loaded->get_value();
70 } else {
71 return -1;
72 }
73 }
74 static jlong unloaded_class_bytes() {
75 if (UsePerfData) {
76 return _classbytes_unloaded->get_value() + _shared_classbytes_unloaded->get_value();
77 } else {
78 return -1;
79 }
80 }
81
82 static jlong loaded_shared_class_count() {
83 return _shared_classes_loaded_count->get_value();
84 }
85 static jlong unloaded_shared_class_count() {
86 return _shared_classes_unloaded_count->get_value();
87 }
88 static jlong loaded_shared_class_bytes() {
89 if (UsePerfData) {
90 return _shared_classbytes_loaded->get_value();
91 } else {
92 return -1;
93 }
94 }
95 static jlong unloaded_shared_class_bytes() {
96 if (UsePerfData) {
97 return _shared_classbytes_unloaded->get_value();
98 } else {
99 return -1;
100 }
101 }
102 static jlong class_method_data_size() {
103 return (UsePerfData ? _class_methods_size->get_value() : -1);
104 }
105
106 static void notify_class_loaded(InstanceKlass* k, bool shared_class)
107 NOT_MANAGEMENT_RETURN;
108 // All unloaded classes are non-shared
109 static void notify_class_unloaded(InstanceKlass* k) NOT_MANAGEMENT_RETURN;
110 static void add_class_method_size(int size) {
111 #if INCLUDE_MANAGEMENT
112 if (UsePerfData) {
113 _class_methods_size->inc(size);
114 }
115 #endif // INCLUDE_MANAGEMENT
116 }
117 };
118
119 // FIXME: make this piece of code to be shared by M&M and JVMTI
120 class LoadedClassesEnumerator : public StackObj {
121 private:
122 static GrowableArray<KlassHandle>* _loaded_classes;
123 // _current_thread is for creating a KlassHandle with a faster version constructor
124 static Thread* _current_thread;
125
126 GrowableArray<KlassHandle>* _klass_handle_array;
127
128 public:
129 LoadedClassesEnumerator(Thread* cur_thread);
130
131 int num_loaded_classes() { return _klass_handle_array->length(); }
132 KlassHandle get_klass(int index) { return _klass_handle_array->at(index); }
133
134 static void add_loaded_class(Klass* k) {
135 // FIXME: For now - don't include array klasses
136 // The spec is unclear at this point to count array klasses or not
137 // and also indirect creation of array of super class and secondaries
138 //
139 // for (Klass* l = k; l != NULL; l = l->array_klass_or_null()) {
140 // KlassHandle h(_current_thread, l);
141 // _loaded_classes->append(h);
142 // }
143 KlassHandle h(_current_thread, k);
144 _loaded_classes->append(h);
145 }
146 };
147
148 #endif // SHARE_VM_SERVICES_CLASSLOADINGSERVICE_HPP

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