1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/services/classLoadingService.cpp Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,212 @@
1.4 +/*
1.5 + * Copyright 2003-2005 Sun Microsystems, Inc. All Rights Reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 + * have any questions.
1.25 + *
1.26 + */
1.27 +
1.28 +# include "incls/_precompiled.incl"
1.29 +# include "incls/_classLoadingService.cpp.incl"
1.30 +
1.31 +#ifdef DTRACE_ENABLED
1.32 +
1.33 +// Only bother with this argument setup if dtrace is available
1.34 +
1.35 +HS_DTRACE_PROBE_DECL4(hotspot, class__loaded, char*, int, oop, bool);
1.36 +HS_DTRACE_PROBE_DECL4(hotspot, class__unloaded, char*, int, oop, bool);
1.37 +
1.38 +#define DTRACE_CLASSLOAD_PROBE(type, clss, shared) \
1.39 + { \
1.40 + char* data = NULL; \
1.41 + int len = 0; \
1.42 + symbolOop name = (clss)->name(); \
1.43 + if (name != NULL) { \
1.44 + data = (char*)name->bytes(); \
1.45 + len = name->utf8_length(); \
1.46 + } \
1.47 + HS_DTRACE_PROBE4(hotspot, class__##type, \
1.48 + data, len, (clss)->class_loader(), (shared)); \
1.49 + }
1.50 +
1.51 +#else // ndef DTRACE_ENABLED
1.52 +
1.53 +#define DTRACE_CLASSLOAD_PROBE(type, clss, shared)
1.54 +
1.55 +#endif
1.56 +
1.57 +// counters for classes loaded from class files
1.58 +PerfCounter* ClassLoadingService::_classes_loaded_count = NULL;
1.59 +PerfCounter* ClassLoadingService::_classes_unloaded_count = NULL;
1.60 +PerfCounter* ClassLoadingService::_classbytes_loaded = NULL;
1.61 +PerfCounter* ClassLoadingService::_classbytes_unloaded = NULL;
1.62 +
1.63 +// counters for classes loaded from shared archive
1.64 +PerfCounter* ClassLoadingService::_shared_classes_loaded_count = NULL;
1.65 +PerfCounter* ClassLoadingService::_shared_classes_unloaded_count = NULL;
1.66 +PerfCounter* ClassLoadingService::_shared_classbytes_loaded = NULL;
1.67 +PerfCounter* ClassLoadingService::_shared_classbytes_unloaded = NULL;
1.68 +PerfVariable* ClassLoadingService::_class_methods_size = NULL;
1.69 +
1.70 +void ClassLoadingService::init() {
1.71 + EXCEPTION_MARK;
1.72 +
1.73 + // These counters are for java.lang.management API support.
1.74 + // They are created even if -XX:-UsePerfData is set and in
1.75 + // that case, they will be allocated on C heap.
1.76 + _classes_loaded_count =
1.77 + PerfDataManager::create_counter(JAVA_CLS, "loadedClasses",
1.78 + PerfData::U_Events, CHECK);
1.79 +
1.80 + _classes_unloaded_count =
1.81 + PerfDataManager::create_counter(JAVA_CLS, "unloadedClasses",
1.82 + PerfData::U_Events, CHECK);
1.83 +
1.84 + _shared_classes_loaded_count =
1.85 + PerfDataManager::create_counter(JAVA_CLS, "sharedLoadedClasses",
1.86 + PerfData::U_Events, CHECK);
1.87 +
1.88 + _shared_classes_unloaded_count =
1.89 + PerfDataManager::create_counter(JAVA_CLS, "sharedUnloadedClasses",
1.90 + PerfData::U_Events, CHECK);
1.91 +
1.92 + if (UsePerfData) {
1.93 + _classbytes_loaded =
1.94 + PerfDataManager::create_counter(SUN_CLS, "loadedBytes",
1.95 + PerfData::U_Bytes, CHECK);
1.96 +
1.97 + _classbytes_unloaded =
1.98 + PerfDataManager::create_counter(SUN_CLS, "unloadedBytes",
1.99 + PerfData::U_Bytes, CHECK);
1.100 + _shared_classbytes_loaded =
1.101 + PerfDataManager::create_counter(SUN_CLS, "sharedLoadedBytes",
1.102 + PerfData::U_Bytes, CHECK);
1.103 +
1.104 + _shared_classbytes_unloaded =
1.105 + PerfDataManager::create_counter(SUN_CLS, "sharedUnloadedBytes",
1.106 + PerfData::U_Bytes, CHECK);
1.107 + _class_methods_size =
1.108 + PerfDataManager::create_variable(SUN_CLS, "methodBytes",
1.109 + PerfData::U_Bytes, CHECK);
1.110 + }
1.111 +}
1.112 +
1.113 +void ClassLoadingService::notify_class_unloaded(instanceKlass* k) {
1.114 + DTRACE_CLASSLOAD_PROBE(unloaded, k, false);
1.115 + // Classes that can be unloaded must be non-shared
1.116 + _classes_unloaded_count->inc();
1.117 +
1.118 + if (UsePerfData) {
1.119 + // add the class size
1.120 + size_t size = compute_class_size(k);
1.121 + _classbytes_unloaded->inc(size);
1.122 +
1.123 + // Compute method size & subtract from running total.
1.124 + // We are called during phase 1 of mark sweep, so it's
1.125 + // still ok to iterate through methodOops here.
1.126 + objArrayOop methods = k->methods();
1.127 + for (int i = 0; i < methods->length(); i++) {
1.128 + _class_methods_size->inc(-methods->obj_at(i)->size());
1.129 + }
1.130 + }
1.131 +
1.132 + if (TraceClassUnloading) {
1.133 + ResourceMark rm;
1.134 + tty->print_cr("[Unloading class %s]", k->external_name());
1.135 + }
1.136 +}
1.137 +
1.138 +void ClassLoadingService::notify_class_loaded(instanceKlass* k, bool shared_class) {
1.139 + DTRACE_CLASSLOAD_PROBE(loaded, k, shared_class);
1.140 + PerfCounter* classes_counter = (shared_class ? _shared_classes_loaded_count
1.141 + : _classes_loaded_count);
1.142 + // increment the count
1.143 + classes_counter->inc();
1.144 +
1.145 + if (UsePerfData) {
1.146 + PerfCounter* classbytes_counter = (shared_class ? _shared_classbytes_loaded
1.147 + : _classbytes_loaded);
1.148 + // add the class size
1.149 + size_t size = compute_class_size(k);
1.150 + classbytes_counter->inc(size);
1.151 + }
1.152 +}
1.153 +
1.154 +size_t ClassLoadingService::compute_class_size(instanceKlass* k) {
1.155 + // lifted from ClassStatistics.do_class(klassOop k)
1.156 +
1.157 + size_t class_size = 0;
1.158 +
1.159 + class_size += k->as_klassOop()->size();
1.160 +
1.161 + if (k->oop_is_instance()) {
1.162 + class_size += k->methods()->size();
1.163 + class_size += k->constants()->size();
1.164 + class_size += k->local_interfaces()->size();
1.165 + class_size += k->transitive_interfaces()->size();
1.166 + // We do not have to count implementors, since we only store one!
1.167 + class_size += k->fields()->size();
1.168 + }
1.169 + return class_size * oopSize;
1.170 +}
1.171 +
1.172 +
1.173 +bool ClassLoadingService::set_verbose(bool verbose) {
1.174 + MutexLocker m(Management_lock);
1.175 +
1.176 + // verbose will be set to the previous value
1.177 + bool succeed = CommandLineFlags::boolAtPut((char*)"TraceClassLoading", &verbose, MANAGEMENT);
1.178 + assert(succeed, "Setting TraceClassLoading flag fails");
1.179 + reset_trace_class_unloading();
1.180 +
1.181 + return verbose;
1.182 +}
1.183 +
1.184 +// Caller to this function must own Management_lock
1.185 +void ClassLoadingService::reset_trace_class_unloading() {
1.186 + assert(Management_lock->owned_by_self(), "Must own the Management_lock");
1.187 + bool value = MemoryService::get_verbose() || ClassLoadingService::get_verbose();
1.188 + bool succeed = CommandLineFlags::boolAtPut((char*)"TraceClassUnloading", &value, MANAGEMENT);
1.189 + assert(succeed, "Setting TraceClassUnLoading flag fails");
1.190 +}
1.191 +
1.192 +GrowableArray<KlassHandle>* LoadedClassesEnumerator::_loaded_classes = NULL;
1.193 +Thread* LoadedClassesEnumerator::_current_thread = NULL;
1.194 +
1.195 +LoadedClassesEnumerator::LoadedClassesEnumerator(Thread* cur_thread) {
1.196 + assert(cur_thread == Thread::current(), "Check current thread");
1.197 +
1.198 + int init_size = ClassLoadingService::loaded_class_count();
1.199 + _klass_handle_array = new GrowableArray<KlassHandle>(init_size);
1.200 +
1.201 + // For consistency of the loaded classes, grab the SystemDictionary lock
1.202 + MutexLocker sd_mutex(SystemDictionary_lock);
1.203 +
1.204 + // Set _loaded_classes and _current_thread and begin enumerating all classes.
1.205 + // Only one thread will do the enumeration at a time.
1.206 + // These static variables are needed and they are used by the static method
1.207 + // add_loaded_class called from classes_do().
1.208 + _loaded_classes = _klass_handle_array;
1.209 + _current_thread = cur_thread;
1.210 +
1.211 + SystemDictionary::classes_do(&add_loaded_class);
1.212 +
1.213 + // FIXME: Exclude array klasses for now
1.214 + // Universe::basic_type_classes_do(&add_loaded_class);
1.215 +}
