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/*
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* Copyright 2003-2005 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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# include "incls/_precompiled.incl"
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# include "incls/_classLoadingService.cpp.incl"
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#ifdef DTRACE_ENABLED
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// Only bother with this argument setup if dtrace is available
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HS_DTRACE_PROBE_DECL4(hotspot, class__loaded, char*, int, oop, bool);
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HS_DTRACE_PROBE_DECL4(hotspot, class__unloaded, char*, int, oop, bool);
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#define DTRACE_CLASSLOAD_PROBE(type, clss, shared) \
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{ \
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char* data = NULL; \
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int len = 0; \
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symbolOop name = (clss)->name(); \
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if (name != NULL) { \
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data = (char*)name->bytes(); \
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len = name->utf8_length(); \
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} \
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HS_DTRACE_PROBE4(hotspot, class__##type, \
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data, len, (clss)->class_loader(), (shared)); \
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}
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#else // ndef DTRACE_ENABLED
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#define DTRACE_CLASSLOAD_PROBE(type, clss, shared)
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#endif
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// counters for classes loaded from class files
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PerfCounter* ClassLoadingService::_classes_loaded_count = NULL;
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PerfCounter* ClassLoadingService::_classes_unloaded_count = NULL;
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PerfCounter* ClassLoadingService::_classbytes_loaded = NULL;
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PerfCounter* ClassLoadingService::_classbytes_unloaded = NULL;
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// counters for classes loaded from shared archive
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PerfCounter* ClassLoadingService::_shared_classes_loaded_count = NULL;
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PerfCounter* ClassLoadingService::_shared_classes_unloaded_count = NULL;
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PerfCounter* ClassLoadingService::_shared_classbytes_loaded = NULL;
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PerfCounter* ClassLoadingService::_shared_classbytes_unloaded = NULL;
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PerfVariable* ClassLoadingService::_class_methods_size = NULL;
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void ClassLoadingService::init() {
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EXCEPTION_MARK;
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// These counters are for java.lang.management API support.
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// They are created even if -XX:-UsePerfData is set and in
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// that case, they will be allocated on C heap.
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_classes_loaded_count =
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PerfDataManager::create_counter(JAVA_CLS, "loadedClasses",
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PerfData::U_Events, CHECK);
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_classes_unloaded_count =
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PerfDataManager::create_counter(JAVA_CLS, "unloadedClasses",
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PerfData::U_Events, CHECK);
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_shared_classes_loaded_count =
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PerfDataManager::create_counter(JAVA_CLS, "sharedLoadedClasses",
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PerfData::U_Events, CHECK);
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_shared_classes_unloaded_count =
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PerfDataManager::create_counter(JAVA_CLS, "sharedUnloadedClasses",
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PerfData::U_Events, CHECK);
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if (UsePerfData) {
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_classbytes_loaded =
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PerfDataManager::create_counter(SUN_CLS, "loadedBytes",
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PerfData::U_Bytes, CHECK);
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_classbytes_unloaded =
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PerfDataManager::create_counter(SUN_CLS, "unloadedBytes",
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PerfData::U_Bytes, CHECK);
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_shared_classbytes_loaded =
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PerfDataManager::create_counter(SUN_CLS, "sharedLoadedBytes",
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PerfData::U_Bytes, CHECK);
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_shared_classbytes_unloaded =
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PerfDataManager::create_counter(SUN_CLS, "sharedUnloadedBytes",
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PerfData::U_Bytes, CHECK);
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_class_methods_size =
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PerfDataManager::create_variable(SUN_CLS, "methodBytes",
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PerfData::U_Bytes, CHECK);
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}
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}
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void ClassLoadingService::notify_class_unloaded(instanceKlass* k) {
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DTRACE_CLASSLOAD_PROBE(unloaded, k, false);
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// Classes that can be unloaded must be non-shared
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_classes_unloaded_count->inc();
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if (UsePerfData) {
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// add the class size
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size_t size = compute_class_size(k);
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_classbytes_unloaded->inc(size);
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// Compute method size & subtract from running total.
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// We are called during phase 1 of mark sweep, so it's
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// still ok to iterate through methodOops here.
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objArrayOop methods = k->methods();
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for (int i = 0; i < methods->length(); i++) {
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_class_methods_size->inc(-methods->obj_at(i)->size());
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}
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}
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if (TraceClassUnloading) {
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ResourceMark rm;
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tty->print_cr("[Unloading class %s]", k->external_name());
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}
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}
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void ClassLoadingService::notify_class_loaded(instanceKlass* k, bool shared_class) {
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DTRACE_CLASSLOAD_PROBE(loaded, k, shared_class);
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PerfCounter* classes_counter = (shared_class ? _shared_classes_loaded_count
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: _classes_loaded_count);
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// increment the count
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classes_counter->inc();
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if (UsePerfData) {
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PerfCounter* classbytes_counter = (shared_class ? _shared_classbytes_loaded
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: _classbytes_loaded);
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// add the class size
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size_t size = compute_class_size(k);
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classbytes_counter->inc(size);
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}
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}
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size_t ClassLoadingService::compute_class_size(instanceKlass* k) {
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// lifted from ClassStatistics.do_class(klassOop k)
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size_t class_size = 0;
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class_size += k->as_klassOop()->size();
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if (k->oop_is_instance()) {
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class_size += k->methods()->size();
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class_size += k->constants()->size();
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class_size += k->local_interfaces()->size();
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class_size += k->transitive_interfaces()->size();
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// We do not have to count implementors, since we only store one!
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class_size += k->fields()->size();
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}
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return class_size * oopSize;
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}
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bool ClassLoadingService::set_verbose(bool verbose) {
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MutexLocker m(Management_lock);
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// verbose will be set to the previous value
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bool succeed = CommandLineFlags::boolAtPut((char*)"TraceClassLoading", &verbose, MANAGEMENT);
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assert(succeed, "Setting TraceClassLoading flag fails");
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reset_trace_class_unloading();
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return verbose;
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}
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// Caller to this function must own Management_lock
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void ClassLoadingService::reset_trace_class_unloading() {
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assert(Management_lock->owned_by_self(), "Must own the Management_lock");
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bool value = MemoryService::get_verbose() || ClassLoadingService::get_verbose();
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bool succeed = CommandLineFlags::boolAtPut((char*)"TraceClassUnloading", &value, MANAGEMENT);
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assert(succeed, "Setting TraceClassUnLoading flag fails");
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}
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GrowableArray<KlassHandle>* LoadedClassesEnumerator::_loaded_classes = NULL;
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Thread* LoadedClassesEnumerator::_current_thread = NULL;
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LoadedClassesEnumerator::LoadedClassesEnumerator(Thread* cur_thread) {
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assert(cur_thread == Thread::current(), "Check current thread");
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int init_size = ClassLoadingService::loaded_class_count();
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_klass_handle_array = new GrowableArray<KlassHandle>(init_size);
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// For consistency of the loaded classes, grab the SystemDictionary lock
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MutexLocker sd_mutex(SystemDictionary_lock);
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// Set _loaded_classes and _current_thread and begin enumerating all classes.
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// Only one thread will do the enumeration at a time.
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// These static variables are needed and they are used by the static method
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// add_loaded_class called from classes_do().
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_loaded_classes = _klass_handle_array;
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_current_thread = cur_thread;
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SystemDictionary::classes_do(&add_loaded_class);
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// FIXME: Exclude array klasses for now
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// Universe::basic_type_classes_do(&add_loaded_class);
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}
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