0N/A

0N/A#include "precompiled.hpp"

0N/A#include "classfile/systemDictionary.hpp"

0N/A#include "memory/allocation.hpp"

0N/A#include "memory/universe.hpp"

0N/A#include "oops/oop.inline.hpp"

0N/A#include "runtime/mutexLocker.hpp"

0N/A#include "services/classLoadingService.hpp"

0N/A#include "services/memoryService.hpp"

0N/A#include "utilities/dtrace.hpp"

0N/A

0N/A#ifdef DTRACE_ENABLED

0N/A

0N/A

0N/A#ifndef USDT2

0N/A

0N/AHS_DTRACE_PROBE_DECL4(hotspot, class__loaded, char*, int, oop, bool);

0N/AHS_DTRACE_PROBE_DECL4(hotspot, class__unloaded, char*, int, oop, bool);

0N/A

0N/A#define DTRACE_CLASSLOAD_PROBE(type, clss, shared) \

0N/A { \

0N/A char* data = NULL; \

0N/A int len = 0; \

0N/A Symbol* name = (clss)->name(); \

0N/A if (name != NULL) { \

0N/A data = (char*)name->bytes(); \

0N/A len = name->utf8_length(); \

0N/A } \

0N/A HS_DTRACE_PROBE4(hotspot, class__##type, \

0N/A data, len, (clss)->class_loader(), (shared)); \

0N/A }

0N/A

0N/A#else /* USDT2 */

0N/A

0N/A#define HOTSPOT_CLASS_unloaded HOTSPOT_CLASS_UNLOADED

0N/A#define HOTSPOT_CLASS_loaded HOTSPOT_CLASS_LOADED

0N/A#define DTRACE_CLASSLOAD_PROBE(type, clss, shared) \

0N/A { \

0N/A char* data = NULL; \

0N/A int len = 0; \

0N/A Symbol* name = (clss)->name(); \

0N/A if (name != NULL) { \

0N/A data = (char*)name->bytes(); \

0N/A len = name->utf8_length(); \

0N/A } \

0N/A HOTSPOT_CLASS_##type( /* type = unloaded, loaded */ \

0N/A data, len, (clss)->class_loader(), (shared)); \

0N/A }

0N/A

0N/A#endif /* USDT2 */

0N/A#else // ndef DTRACE_ENABLED

0N/A

0N/A#define DTRACE_CLASSLOAD_PROBE(type, clss, shared)

0N/A

0N/A#endif

0N/A

0N/APerfCounter* ClassLoadingService::_classes_loaded_count = NULL;

0N/APerfCounter* ClassLoadingService::_classes_unloaded_count = NULL;

0N/APerfCounter* ClassLoadingService::_classbytes_loaded = NULL;

0N/APerfCounter* ClassLoadingService::_classbytes_unloaded = NULL;

0N/A

0N/APerfCounter* ClassLoadingService::_shared_classes_loaded_count = NULL;

0N/APerfCounter* ClassLoadingService::_shared_classes_unloaded_count = NULL;

0N/APerfCounter* ClassLoadingService::_shared_classbytes_loaded = NULL;

0N/APerfCounter* 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;

}

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);

}