1 /*
2 * Copyright (c) 2003, 2015, 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 #include "precompiled.hpp"
26 #include "classfile/systemDictionary.hpp"
27 #include "memory/allocation.hpp"
28 #include "memory/universe.hpp"
29 #include "oops/oop.inline.hpp"
30 #include "runtime/mutexLocker.hpp"
31 #include "services/classLoadingService.hpp"
32 #include "services/memoryService.hpp"
33 #include "utilities/dtrace.hpp"
34 #include "utilities/macros.hpp"
35 #include "utilities/defaultStream.hpp"
36
37 #ifdef DTRACE_ENABLED
38
39 // Only bother with this argument setup if dtrace is available
40
41 #define HOTSPOT_CLASS_unloaded HOTSPOT_CLASS_UNLOADED
42 #define HOTSPOT_CLASS_loaded HOTSPOT_CLASS_LOADED
43 #define DTRACE_CLASSLOAD_PROBE(type, clss, shared) \
44 { \
45 char* data = NULL; \
46 int len = 0; \
47 Symbol* name = (clss)->name(); \
48 if (name != NULL) { \
49 data = (char*)name->bytes(); \
50 len = name->utf8_length(); \
51 } \
52 HOTSPOT_CLASS_##type( /* type = unloaded, loaded */ \
53 data, len, (clss)->class_loader(), (shared)); \
54 }
55
118
119 void ClassLoadingService::notify_class_unloaded(InstanceKlass* k) {
120 DTRACE_CLASSLOAD_PROBE(unloaded, k, false);
121 // Classes that can be unloaded must be non-shared
122 _classes_unloaded_count->inc();
123
124 if (UsePerfData) {
125 // add the class size
126 size_t size = compute_class_size(k);
127 _classbytes_unloaded->inc(size);
128
129 // Compute method size & subtract from running total.
130 // We are called during phase 1 of mark sweep, so it's
131 // still ok to iterate through Method*s here.
132 Array<Method*>* methods = k->methods();
133 for (int i = 0; i < methods->length(); i++) {
134 _class_methods_size->inc(-methods->at(i)->size());
135 }
136 }
137
138 if (TraceClassUnloading) {
139 ResourceMark rm;
140 tty->print_cr("[Unloading class %s " INTPTR_FORMAT "]", k->external_name(), p2i(k));
141 }
142 }
143
144 void ClassLoadingService::notify_class_loaded(InstanceKlass* k, bool shared_class) {
145 DTRACE_CLASSLOAD_PROBE(loaded, k, shared_class);
146 PerfCounter* classes_counter = (shared_class ? _shared_classes_loaded_count
147 : _classes_loaded_count);
148 // increment the count
149 classes_counter->inc();
150
151 if (UsePerfData) {
152 PerfCounter* classbytes_counter = (shared_class ? _shared_classbytes_loaded
153 : _classbytes_loaded);
154 // add the class size
155 size_t size = compute_class_size(k);
156 classbytes_counter->inc(size);
157 }
158 }
159
160 size_t ClassLoadingService::compute_class_size(InstanceKlass* k) {
162
163 size_t class_size = 0;
164
165 class_size += k->size();
166
167 if (k->is_instance_klass()) {
168 class_size += k->methods()->size();
169 // FIXME: Need to count the contents of methods
170 class_size += k->constants()->size();
171 class_size += k->local_interfaces()->size();
172 class_size += k->transitive_interfaces()->size();
173 // We do not have to count implementors, since we only store one!
174 // FIXME: How should these be accounted for, now when they have moved.
175 //class_size += k->fields()->size();
176 }
177 return class_size * oopSize;
178 }
179
180 bool ClassLoadingService::set_verbose(bool verbose) {
181 MutexLocker m(Management_lock);
182
183 // verbose will be set to the previous value
184 Flag::Error error = CommandLineFlags::boolAtPut("TraceClassLoading", &verbose, Flag::MANAGEMENT);
185 assert(error==Flag::SUCCESS, "Setting TraceClassLoading flag failed with error %s", Flag::flag_error_str(error));
186 reset_trace_class_unloading();
187
188 return verbose;
189 }
190
191 // Caller to this function must own Management_lock
192 void ClassLoadingService::reset_trace_class_unloading() {
193 assert(Management_lock->owned_by_self(), "Must own the Management_lock");
194 bool value = MemoryService::get_verbose() || ClassLoadingService::get_verbose();
195 Flag::Error error = CommandLineFlags::boolAtPut("TraceClassUnloading", &value, Flag::MANAGEMENT);
196 assert(error==Flag::SUCCESS, "Setting TraceClassUnLoading flag failed with error %s", Flag::flag_error_str(error));
197 }
198
199 GrowableArray<KlassHandle>* LoadedClassesEnumerator::_loaded_classes = NULL;
200 Thread* LoadedClassesEnumerator::_current_thread = NULL;
201
202 LoadedClassesEnumerator::LoadedClassesEnumerator(Thread* cur_thread) {
203 assert(cur_thread == Thread::current(), "Check current thread");
204
205 int init_size = ClassLoadingService::loaded_class_count();
206 _klass_handle_array = new GrowableArray<KlassHandle>(init_size);
207
208 // For consistency of the loaded classes, grab the SystemDictionary lock
209 MutexLocker sd_mutex(SystemDictionary_lock);
210
211 // Set _loaded_classes and _current_thread and begin enumerating all classes.
212 // Only one thread will do the enumeration at a time.
213 // These static variables are needed and they are used by the static method
214 // add_loaded_class called from classes_do().
215 _loaded_classes = _klass_handle_array;
216 _current_thread = cur_thread;
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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 #include "precompiled.hpp"
26 #include "classfile/systemDictionary.hpp"
27 #include "memory/allocation.hpp"
28 #include "memory/universe.hpp"
29 #include "oops/oop.inline.hpp"
30 #include "runtime/mutexLocker.hpp"
31 #include "services/classLoadingService.hpp"
32 #include "services/memoryService.hpp"
33 #include "utilities/dtrace.hpp"
34 #include "utilities/macros.hpp"
35 #include "utilities/defaultStream.hpp"
36 #include "logging/log.hpp"
37 #include "logging/logConfiguration.hpp"
38
39 #ifdef DTRACE_ENABLED
40
41 // Only bother with this argument setup if dtrace is available
42
43 #define HOTSPOT_CLASS_unloaded HOTSPOT_CLASS_UNLOADED
44 #define HOTSPOT_CLASS_loaded HOTSPOT_CLASS_LOADED
45 #define DTRACE_CLASSLOAD_PROBE(type, clss, shared) \
46 { \
47 char* data = NULL; \
48 int len = 0; \
49 Symbol* name = (clss)->name(); \
50 if (name != NULL) { \
51 data = (char*)name->bytes(); \
52 len = name->utf8_length(); \
53 } \
54 HOTSPOT_CLASS_##type( /* type = unloaded, loaded */ \
55 data, len, (clss)->class_loader(), (shared)); \
56 }
57
120
121 void ClassLoadingService::notify_class_unloaded(InstanceKlass* k) {
122 DTRACE_CLASSLOAD_PROBE(unloaded, k, false);
123 // Classes that can be unloaded must be non-shared
124 _classes_unloaded_count->inc();
125
126 if (UsePerfData) {
127 // add the class size
128 size_t size = compute_class_size(k);
129 _classbytes_unloaded->inc(size);
130
131 // Compute method size & subtract from running total.
132 // We are called during phase 1 of mark sweep, so it's
133 // still ok to iterate through Method*s here.
134 Array<Method*>* methods = k->methods();
135 for (int i = 0; i < methods->length(); i++) {
136 _class_methods_size->inc(-methods->at(i)->size());
137 }
138 }
139
140 if (log_is_enabled(Info, classunload)) {
141 ResourceMark rm;
142 log_info(classunload)("unloading class %s " INTPTR_FORMAT , k->external_name(), p2i(k));
143 }
144 }
145
146 void ClassLoadingService::notify_class_loaded(InstanceKlass* k, bool shared_class) {
147 DTRACE_CLASSLOAD_PROBE(loaded, k, shared_class);
148 PerfCounter* classes_counter = (shared_class ? _shared_classes_loaded_count
149 : _classes_loaded_count);
150 // increment the count
151 classes_counter->inc();
152
153 if (UsePerfData) {
154 PerfCounter* classbytes_counter = (shared_class ? _shared_classbytes_loaded
155 : _classbytes_loaded);
156 // add the class size
157 size_t size = compute_class_size(k);
158 classbytes_counter->inc(size);
159 }
160 }
161
162 size_t ClassLoadingService::compute_class_size(InstanceKlass* k) {
164
165 size_t class_size = 0;
166
167 class_size += k->size();
168
169 if (k->is_instance_klass()) {
170 class_size += k->methods()->size();
171 // FIXME: Need to count the contents of methods
172 class_size += k->constants()->size();
173 class_size += k->local_interfaces()->size();
174 class_size += k->transitive_interfaces()->size();
175 // We do not have to count implementors, since we only store one!
176 // FIXME: How should these be accounted for, now when they have moved.
177 //class_size += k->fields()->size();
178 }
179 return class_size * oopSize;
180 }
181
182 bool ClassLoadingService::set_verbose(bool verbose) {
183 MutexLocker m(Management_lock);
184 // verbose will be set to the previous value
185 if (verbose) {
186 LogConfiguration::parse_log_arguments("stdout", "classload=info", NULL, NULL, NULL);
187 } else {
188 LogConfiguration::parse_log_arguments("stdout", "classload=off", NULL, NULL, NULL);
189 }
190 reset_trace_class_unloading();
191 return verbose;
192 }
193
194 // Caller to this function must own Management_lock
195 void ClassLoadingService::reset_trace_class_unloading() {
196 assert(Management_lock->owned_by_self(), "Must own the Management_lock");
197 bool value = MemoryService::get_verbose() || ClassLoadingService::get_verbose();
198 if (value) {
199 LogConfiguration::parse_log_arguments("stdout", "classunload=info", NULL, NULL, NULL);
200 } else {
201 LogConfiguration::parse_log_arguments("stdout", "classunload=off", NULL, NULL, NULL);
202 }
203 }
204
205 GrowableArray<KlassHandle>* LoadedClassesEnumerator::_loaded_classes = NULL;
206 Thread* LoadedClassesEnumerator::_current_thread = NULL;
207
208 LoadedClassesEnumerator::LoadedClassesEnumerator(Thread* cur_thread) {
209 assert(cur_thread == Thread::current(), "Check current thread");
210
211 int init_size = ClassLoadingService::loaded_class_count();
212 _klass_handle_array = new GrowableArray<KlassHandle>(init_size);
213
214 // For consistency of the loaded classes, grab the SystemDictionary lock
215 MutexLocker sd_mutex(SystemDictionary_lock);
216
217 // Set _loaded_classes and _current_thread and begin enumerating all classes.
218 // Only one thread will do the enumeration at a time.
219 // These static variables are needed and they are used by the static method
220 // add_loaded_class called from classes_do().
221 _loaded_classes = _klass_handle_array;
222 _current_thread = cur_thread;
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