Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 2003, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #include "precompiled.hpp"

 #include "classfile/systemDictionary.hpp"

 #include "memory/allocation.hpp"

 #include "memory/universe.hpp"

 #include "oops/oop.inline.hpp"

 #include "runtime/mutexLocker.hpp"

 #include "services/classLoadingService.hpp"

 #include "services/memoryService.hpp"

 #include "utilities/dtrace.hpp"

 #ifdef DTRACE_ENABLED

 // Only bother with this argument setup if dtrace is available

 #ifndef USDT2

 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;                                    \

     Symbol* 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 /* USDT2 */

 #define HOTSPOT_CLASS_unloaded HOTSPOT_CLASS_UNLOADED

 #define HOTSPOT_CLASS_loaded HOTSPOT_CLASS_LOADED

 #define DTRACE_CLASSLOAD_PROBE(type, clss, shared)  \

   {                                                 \

     char* data = NULL;                              \

     int len = 0;                                    \

     Symbol* name = (clss)->name();                  \

     if (name != NULL) {                             \

       data = (char*)name->bytes();                  \

       len = name->utf8_length();                    \

     }                                               \

     HOTSPOT_CLASS_##type( /* type = unloaded, loaded */ \

       data, len, (clss)->class_loader(), (shared)); \

   }

 #endif /* USDT2 */

 #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 Method*s here.

     Array<Method*>* methods = k->methods();

     for (int i = 0; i < methods->length(); i++) {

       _class_methods_size->inc(-methods->at(i)->size());

     }

   }

   if (TraceClassUnloading) {

     ResourceMark rm;

     tty->print_cr("[Unloading class %s " INTPTR_FORMAT "]", k->external_name(), k);

   }

 }

 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(Klass* k)

   size_t class_size = 0;

   class_size += k->size();

   if (k->oop_is_instance()) {

     class_size += k->methods()->size();

     // FIXME: Need to count the contents of methods

     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!

     // FIXME: How should these be accounted for, now when they have moved.

     //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);

 }