Mercurial > hg > truffle
diff src/share/vm/services/classLoadingService.cpp @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | e018e6884bd8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/services/classLoadingService.cpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,212 @@ +/* + * Copyright 2003-2005 Sun Microsystems, Inc. All Rights Reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +# include "incls/_precompiled.incl" +# include "incls/_classLoadingService.cpp.incl" + +#ifdef DTRACE_ENABLED + +// Only bother with this argument setup if dtrace is available + +HS_DTRACE_PROBE_DECL4(hotspot, class__loaded, char*, int, oop, bool); +HS_DTRACE_PROBE_DECL4(hotspot, class__unloaded, char*, int, oop, bool); + +#define DTRACE_CLASSLOAD_PROBE(type, clss, shared) \ + { \ + char* data = NULL; \ + int len = 0; \ + symbolOop name = (clss)->name(); \ + if (name != NULL) { \ + data = (char*)name->bytes(); \ + len = name->utf8_length(); \ + } \ + HS_DTRACE_PROBE4(hotspot, class__##type, \ + data, len, (clss)->class_loader(), (shared)); \ + } + +#else // ndef DTRACE_ENABLED + +#define DTRACE_CLASSLOAD_PROBE(type, clss, shared) + +#endif + +// counters for classes loaded from class files +PerfCounter* ClassLoadingService::_classes_loaded_count = NULL; +PerfCounter* ClassLoadingService::_classes_unloaded_count = NULL; +PerfCounter* ClassLoadingService::_classbytes_loaded = NULL; +PerfCounter* ClassLoadingService::_classbytes_unloaded = NULL; + +// counters for classes loaded from shared archive +PerfCounter* ClassLoadingService::_shared_classes_loaded_count = NULL; +PerfCounter* ClassLoadingService::_shared_classes_unloaded_count = NULL; +PerfCounter* ClassLoadingService::_shared_classbytes_loaded = NULL; +PerfCounter* ClassLoadingService::_shared_classbytes_unloaded = NULL; +PerfVariable* ClassLoadingService::_class_methods_size = NULL; + +void ClassLoadingService::init() { + EXCEPTION_MARK; + + // These counters are for java.lang.management API support. + // They are created even if -XX:-UsePerfData is set and in + // that case, they will be allocated on C heap. + _classes_loaded_count = + PerfDataManager::create_counter(JAVA_CLS, "loadedClasses", + PerfData::U_Events, CHECK); + + _classes_unloaded_count = + PerfDataManager::create_counter(JAVA_CLS, "unloadedClasses", + PerfData::U_Events, CHECK); + + _shared_classes_loaded_count = + PerfDataManager::create_counter(JAVA_CLS, "sharedLoadedClasses", + PerfData::U_Events, CHECK); + + _shared_classes_unloaded_count = + PerfDataManager::create_counter(JAVA_CLS, "sharedUnloadedClasses", + PerfData::U_Events, CHECK); + + if (UsePerfData) { + _classbytes_loaded = + PerfDataManager::create_counter(SUN_CLS, "loadedBytes", + PerfData::U_Bytes, CHECK); + + _classbytes_unloaded = + PerfDataManager::create_counter(SUN_CLS, "unloadedBytes", + PerfData::U_Bytes, CHECK); + _shared_classbytes_loaded = + PerfDataManager::create_counter(SUN_CLS, "sharedLoadedBytes", + PerfData::U_Bytes, CHECK); + + _shared_classbytes_unloaded = + PerfDataManager::create_counter(SUN_CLS, "sharedUnloadedBytes", + PerfData::U_Bytes, CHECK); + _class_methods_size = + PerfDataManager::create_variable(SUN_CLS, "methodBytes", + PerfData::U_Bytes, CHECK); + } +} + +void ClassLoadingService::notify_class_unloaded(instanceKlass* k) { + DTRACE_CLASSLOAD_PROBE(unloaded, k, false); + // Classes that can be unloaded must be non-shared + _classes_unloaded_count->inc(); + + if (UsePerfData) { + // add the class size + size_t size = compute_class_size(k); + _classbytes_unloaded->inc(size); + + // Compute method size & subtract from running total. + // We are called during phase 1 of mark sweep, so it's + // still ok to iterate through methodOops here. + objArrayOop methods = k->methods(); + for (int i = 0; i < methods->length(); i++) { + _class_methods_size->inc(-methods->obj_at(i)->size()); + } + } + + if (TraceClassUnloading) { + ResourceMark rm; + tty->print_cr("[Unloading class %s]", k->external_name()); + } +} + +void ClassLoadingService::notify_class_loaded(instanceKlass* k, bool shared_class) { + DTRACE_CLASSLOAD_PROBE(loaded, k, shared_class); + PerfCounter* classes_counter = (shared_class ? _shared_classes_loaded_count + : _classes_loaded_count); + // increment the count + classes_counter->inc(); + + if (UsePerfData) { + PerfCounter* classbytes_counter = (shared_class ? _shared_classbytes_loaded + : _classbytes_loaded); + // add the class size + size_t size = compute_class_size(k); + classbytes_counter->inc(size); + } +} + +size_t ClassLoadingService::compute_class_size(instanceKlass* k) { + // lifted from ClassStatistics.do_class(klassOop k) + + size_t class_size = 0; + + class_size += k->as_klassOop()->size(); + + if (k->oop_is_instance()) { + class_size += k->methods()->size(); + class_size += k->constants()->size(); + class_size += k->local_interfaces()->size(); + class_size += k->transitive_interfaces()->size(); + // We do not have to count implementors, since we only store one! + class_size += k->fields()->size(); + } + return class_size * oopSize; +} + + +bool ClassLoadingService::set_verbose(bool verbose) { + MutexLocker m(Management_lock); + + // verbose will be set to the previous value + bool succeed = CommandLineFlags::boolAtPut((char*)"TraceClassLoading", &verbose, MANAGEMENT); + assert(succeed, "Setting TraceClassLoading flag fails"); + reset_trace_class_unloading(); + + return verbose; +} + +// Caller to this function must own Management_lock +void ClassLoadingService::reset_trace_class_unloading() { + assert(Management_lock->owned_by_self(), "Must own the Management_lock"); + bool value = MemoryService::get_verbose() || ClassLoadingService::get_verbose(); + bool succeed = CommandLineFlags::boolAtPut((char*)"TraceClassUnloading", &value, MANAGEMENT); + assert(succeed, "Setting TraceClassUnLoading flag fails"); +} + +GrowableArray<KlassHandle>* LoadedClassesEnumerator::_loaded_classes = NULL; +Thread* LoadedClassesEnumerator::_current_thread = NULL; + +LoadedClassesEnumerator::LoadedClassesEnumerator(Thread* cur_thread) { + assert(cur_thread == Thread::current(), "Check current thread"); + + int init_size = ClassLoadingService::loaded_class_count(); + _klass_handle_array = new GrowableArray<KlassHandle>(init_size); + + // For consistency of the loaded classes, grab the SystemDictionary lock + MutexLocker sd_mutex(SystemDictionary_lock); + + // Set _loaded_classes and _current_thread and begin enumerating all classes. + // Only one thread will do the enumeration at a time. + // These static variables are needed and they are used by the static method + // add_loaded_class called from classes_do(). + _loaded_classes = _klass_handle_array; + _current_thread = cur_thread; + + SystemDictionary::classes_do(&add_loaded_class); + + // FIXME: Exclude array klasses for now + // Universe::basic_type_classes_do(&add_loaded_class); +}