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/*
* Copyright (c) 2003, 2014, 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"
#include "utilities/macros.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, SOLARIS_ONLY((void *))(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
#if INCLUDE_MANAGEMENT
// 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(), p2i(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, Flag::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, Flag::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);
}
#endif // INCLUDE_MANAGEMENT
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