aoqi@0: /*
aoqi@0:  * Copyright (c) 2003, 2014, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #include "precompiled.hpp"
aoqi@0: #include "classfile/systemDictionary.hpp"
aoqi@0: #include "memory/allocation.hpp"
aoqi@0: #include "memory/universe.hpp"
aoqi@0: #include "oops/oop.inline.hpp"
aoqi@0: #include "runtime/mutexLocker.hpp"
aoqi@0: #include "services/classLoadingService.hpp"
aoqi@0: #include "services/memoryService.hpp"
aoqi@0: #include "utilities/dtrace.hpp"
aoqi@0: #include "utilities/macros.hpp"
aoqi@0: 
aoqi@0: #ifdef DTRACE_ENABLED
aoqi@0: 
aoqi@0: // Only bother with this argument setup if dtrace is available
aoqi@0: 
aoqi@0: #ifndef USDT2
aoqi@0: 
aoqi@0: HS_DTRACE_PROBE_DECL4(hotspot, class__loaded, char*, int, oop, bool);
aoqi@0: HS_DTRACE_PROBE_DECL4(hotspot, class__unloaded, char*, int, oop, bool);
aoqi@0: 
aoqi@0: #define DTRACE_CLASSLOAD_PROBE(type, clss, shared)  \
aoqi@0:   {                                                 \
aoqi@0:     char* data = NULL;                              \
aoqi@0:     int len = 0;                                    \
aoqi@0:     Symbol* name = (clss)->name();                  \
aoqi@0:     if (name != NULL) {                             \
aoqi@0:       data = (char*)name->bytes();                  \
aoqi@0:       len = name->utf8_length();                    \
aoqi@0:     }                                               \
aoqi@0:     HS_DTRACE_PROBE4(hotspot, class__##type,        \
aoqi@0:       data, len, SOLARIS_ONLY((void *))(clss)->class_loader(), (shared)); \
aoqi@0:   }
aoqi@0: 
aoqi@0: #else /* USDT2 */
aoqi@0: 
aoqi@0: #define HOTSPOT_CLASS_unloaded HOTSPOT_CLASS_UNLOADED
aoqi@0: #define HOTSPOT_CLASS_loaded HOTSPOT_CLASS_LOADED
aoqi@0: #define DTRACE_CLASSLOAD_PROBE(type, clss, shared)  \
aoqi@0:   {                                                 \
aoqi@0:     char* data = NULL;                              \
aoqi@0:     int len = 0;                                    \
aoqi@0:     Symbol* name = (clss)->name();                  \
aoqi@0:     if (name != NULL) {                             \
aoqi@0:       data = (char*)name->bytes();                  \
aoqi@0:       len = name->utf8_length();                    \
aoqi@0:     }                                               \
aoqi@0:     HOTSPOT_CLASS_##type( /* type = unloaded, loaded */ \
aoqi@0:       data, len, (clss)->class_loader(), (shared)); \
aoqi@0:   }
aoqi@0: 
aoqi@0: #endif /* USDT2 */
aoqi@0: #else //  ndef DTRACE_ENABLED
aoqi@0: 
aoqi@0: #define DTRACE_CLASSLOAD_PROBE(type, clss, shared)
aoqi@0: 
aoqi@0: #endif
aoqi@0: 
aoqi@0: #if INCLUDE_MANAGEMENT
aoqi@0: // counters for classes loaded from class files
aoqi@0: PerfCounter*    ClassLoadingService::_classes_loaded_count = NULL;
aoqi@0: PerfCounter*    ClassLoadingService::_classes_unloaded_count = NULL;
aoqi@0: PerfCounter*    ClassLoadingService::_classbytes_loaded = NULL;
aoqi@0: PerfCounter*    ClassLoadingService::_classbytes_unloaded = NULL;
aoqi@0: 
aoqi@0: // counters for classes loaded from shared archive
aoqi@0: PerfCounter*    ClassLoadingService::_shared_classes_loaded_count = NULL;
aoqi@0: PerfCounter*    ClassLoadingService::_shared_classes_unloaded_count = NULL;
aoqi@0: PerfCounter*    ClassLoadingService::_shared_classbytes_loaded = NULL;
aoqi@0: PerfCounter*    ClassLoadingService::_shared_classbytes_unloaded = NULL;
aoqi@0: PerfVariable*   ClassLoadingService::_class_methods_size = NULL;
aoqi@0: 
aoqi@0: void ClassLoadingService::init() {
aoqi@0:   EXCEPTION_MARK;
aoqi@0: 
aoqi@0:   // These counters are for java.lang.management API support.
aoqi@0:   // They are created even if -XX:-UsePerfData is set and in
aoqi@0:   // that case, they will be allocated on C heap.
aoqi@0:   _classes_loaded_count =
aoqi@0:                  PerfDataManager::create_counter(JAVA_CLS, "loadedClasses",
aoqi@0:                                                  PerfData::U_Events, CHECK);
aoqi@0: 
aoqi@0:   _classes_unloaded_count =
aoqi@0:                  PerfDataManager::create_counter(JAVA_CLS, "unloadedClasses",
aoqi@0:                                                  PerfData::U_Events, CHECK);
aoqi@0: 
aoqi@0:   _shared_classes_loaded_count =
aoqi@0:                  PerfDataManager::create_counter(JAVA_CLS, "sharedLoadedClasses",
aoqi@0:                                                  PerfData::U_Events, CHECK);
aoqi@0: 
aoqi@0:   _shared_classes_unloaded_count =
aoqi@0:                  PerfDataManager::create_counter(JAVA_CLS, "sharedUnloadedClasses",
aoqi@0:                                                  PerfData::U_Events, CHECK);
aoqi@0: 
aoqi@0:   if (UsePerfData) {
aoqi@0:     _classbytes_loaded =
aoqi@0:                  PerfDataManager::create_counter(SUN_CLS, "loadedBytes",
aoqi@0:                                                  PerfData::U_Bytes, CHECK);
aoqi@0: 
aoqi@0:     _classbytes_unloaded =
aoqi@0:                  PerfDataManager::create_counter(SUN_CLS, "unloadedBytes",
aoqi@0:                                                  PerfData::U_Bytes, CHECK);
aoqi@0:     _shared_classbytes_loaded =
aoqi@0:                  PerfDataManager::create_counter(SUN_CLS, "sharedLoadedBytes",
aoqi@0:                                                  PerfData::U_Bytes, CHECK);
aoqi@0: 
aoqi@0:     _shared_classbytes_unloaded =
aoqi@0:                  PerfDataManager::create_counter(SUN_CLS, "sharedUnloadedBytes",
aoqi@0:                                                  PerfData::U_Bytes, CHECK);
aoqi@0:     _class_methods_size =
aoqi@0:                  PerfDataManager::create_variable(SUN_CLS, "methodBytes",
aoqi@0:                                                   PerfData::U_Bytes, CHECK);
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: void ClassLoadingService::notify_class_unloaded(InstanceKlass* k) {
aoqi@0:   DTRACE_CLASSLOAD_PROBE(unloaded, k, false);
aoqi@0:   // Classes that can be unloaded must be non-shared
aoqi@0:   _classes_unloaded_count->inc();
aoqi@0: 
aoqi@0:   if (UsePerfData) {
aoqi@0:     // add the class size
aoqi@0:     size_t size = compute_class_size(k);
aoqi@0:     _classbytes_unloaded->inc(size);
aoqi@0: 
aoqi@0:     // Compute method size & subtract from running total.
aoqi@0:     // We are called during phase 1 of mark sweep, so it's
aoqi@0:     // still ok to iterate through Method*s here.
aoqi@0:     Array<Method*>* methods = k->methods();
aoqi@0:     for (int i = 0; i < methods->length(); i++) {
aoqi@0:       _class_methods_size->inc(-methods->at(i)->size());
aoqi@0:     }
aoqi@0:   }
aoqi@0: 
aoqi@0:   if (TraceClassUnloading) {
aoqi@0:     ResourceMark rm;
aoqi@0:     tty->print_cr("[Unloading class %s " INTPTR_FORMAT "]", k->external_name(), p2i(k));
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: void ClassLoadingService::notify_class_loaded(InstanceKlass* k, bool shared_class) {
aoqi@0:   DTRACE_CLASSLOAD_PROBE(loaded, k, shared_class);
aoqi@0:   PerfCounter* classes_counter = (shared_class ? _shared_classes_loaded_count
aoqi@0:                                                : _classes_loaded_count);
aoqi@0:   // increment the count
aoqi@0:   classes_counter->inc();
aoqi@0: 
aoqi@0:   if (UsePerfData) {
aoqi@0:     PerfCounter* classbytes_counter = (shared_class ? _shared_classbytes_loaded
aoqi@0:                                                     : _classbytes_loaded);
aoqi@0:     // add the class size
aoqi@0:     size_t size = compute_class_size(k);
aoqi@0:     classbytes_counter->inc(size);
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: size_t ClassLoadingService::compute_class_size(InstanceKlass* k) {
aoqi@0:   // lifted from ClassStatistics.do_class(Klass* k)
aoqi@0: 
aoqi@0:   size_t class_size = 0;
aoqi@0: 
aoqi@0:   class_size += k->size();
aoqi@0: 
aoqi@0:   if (k->oop_is_instance()) {
aoqi@0:     class_size += k->methods()->size();
aoqi@0:     // FIXME: Need to count the contents of methods
aoqi@0:     class_size += k->constants()->size();
aoqi@0:     class_size += k->local_interfaces()->size();
aoqi@0:     class_size += k->transitive_interfaces()->size();
aoqi@0:     // We do not have to count implementors, since we only store one!
aoqi@0:     // FIXME: How should these be accounted for, now when they have moved.
aoqi@0:     //class_size += k->fields()->size();
aoqi@0:   }
aoqi@0:   return class_size * oopSize;
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: bool ClassLoadingService::set_verbose(bool verbose) {
aoqi@0:   MutexLocker m(Management_lock);
aoqi@0: 
aoqi@0:   // verbose will be set to the previous value
aoqi@0:   bool succeed = CommandLineFlags::boolAtPut((char*)"TraceClassLoading", &verbose, Flag::MANAGEMENT);
aoqi@0:   assert(succeed, "Setting TraceClassLoading flag fails");
aoqi@0:   reset_trace_class_unloading();
aoqi@0: 
aoqi@0:   return verbose;
aoqi@0: }
aoqi@0: 
aoqi@0: // Caller to this function must own Management_lock
aoqi@0: void ClassLoadingService::reset_trace_class_unloading() {
aoqi@0:   assert(Management_lock->owned_by_self(), "Must own the Management_lock");
aoqi@0:   bool value = MemoryService::get_verbose() || ClassLoadingService::get_verbose();
aoqi@0:   bool succeed = CommandLineFlags::boolAtPut((char*)"TraceClassUnloading", &value, Flag::MANAGEMENT);
aoqi@0:   assert(succeed, "Setting TraceClassUnLoading flag fails");
aoqi@0: }
aoqi@0: 
aoqi@0: GrowableArray<KlassHandle>* LoadedClassesEnumerator::_loaded_classes = NULL;
aoqi@0: Thread* LoadedClassesEnumerator::_current_thread = NULL;
aoqi@0: 
aoqi@0: LoadedClassesEnumerator::LoadedClassesEnumerator(Thread* cur_thread) {
aoqi@0:   assert(cur_thread == Thread::current(), "Check current thread");
aoqi@0: 
aoqi@0:   int init_size = ClassLoadingService::loaded_class_count();
aoqi@0:   _klass_handle_array = new GrowableArray<KlassHandle>(init_size);
aoqi@0: 
aoqi@0:   // For consistency of the loaded classes, grab the SystemDictionary lock
aoqi@0:   MutexLocker sd_mutex(SystemDictionary_lock);
aoqi@0: 
aoqi@0:   // Set _loaded_classes and _current_thread and begin enumerating all classes.
aoqi@0:   // Only one thread will do the enumeration at a time.
aoqi@0:   // These static variables are needed and they are used by the static method
aoqi@0:   // add_loaded_class called from classes_do().
aoqi@0:   _loaded_classes = _klass_handle_array;
aoqi@0:   _current_thread = cur_thread;
aoqi@0: 
aoqi@0:   SystemDictionary::classes_do(&add_loaded_class);
aoqi@0: 
aoqi@0:   // FIXME: Exclude array klasses for now
aoqi@0:   // Universe::basic_type_classes_do(&add_loaded_class);
aoqi@0: }
aoqi@0: 
aoqi@0: #endif // INCLUDE_MANAGEMENT