jdk

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/*
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 * Copyright (c) 2003, 2023, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "memory/allocation.hpp"
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#include "memory/resourceArea.hpp"
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#include "oops/oop.inline.hpp"
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#include "oops/instanceKlass.hpp"
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#include "oops/method.hpp"
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#include "runtime/mutexLocker.hpp"
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#include "services/classLoadingService.hpp"
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#include "services/memoryService.hpp"
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#include "utilities/dtrace.hpp"
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#include "utilities/macros.hpp"
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#include "utilities/defaultStream.hpp"
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#include "logging/log.hpp"
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#include "logging/logConfiguration.hpp"
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#ifdef DTRACE_ENABLED
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// Only bother with this argument setup if dtrace is available
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#define HOTSPOT_CLASS_unloaded HOTSPOT_CLASS_UNLOADED
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#define HOTSPOT_CLASS_loaded HOTSPOT_CLASS_LOADED
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#define DTRACE_CLASSLOAD_PROBE(type, clss, shared)  \
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  {                                                 \
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    char* data = nullptr;                           \
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    int len = 0;                                    \
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    Symbol* name = (clss)->name();                  \
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    if (name != nullptr) {                          \
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      data = (char*)name->bytes();                  \
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      len = name->utf8_length();                    \
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    }                                               \
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    HOTSPOT_CLASS_##type( /* type = unloaded, loaded */ \
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      data, len, (void*)(clss)->class_loader_data(), (shared)); \
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  }
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#else //  ndef DTRACE_ENABLED
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#define DTRACE_CLASSLOAD_PROBE(type, clss, shared)
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#endif
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#if INCLUDE_MANAGEMENT
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// counters for classes loaded from class files
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PerfCounter*    ClassLoadingService::_classes_loaded_count = nullptr;
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PerfCounter*    ClassLoadingService::_classes_unloaded_count = nullptr;
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PerfCounter*    ClassLoadingService::_classbytes_loaded = nullptr;
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PerfCounter*    ClassLoadingService::_classbytes_unloaded = nullptr;
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// counters for classes loaded from shared archive
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PerfCounter*    ClassLoadingService::_shared_classes_loaded_count = nullptr;
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PerfCounter*    ClassLoadingService::_shared_classes_unloaded_count = nullptr;
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PerfCounter*    ClassLoadingService::_shared_classbytes_loaded = nullptr;
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PerfCounter*    ClassLoadingService::_shared_classbytes_unloaded = nullptr;
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PerfVariable*   ClassLoadingService::_class_methods_size = nullptr;
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void ClassLoadingService::init() {
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  EXCEPTION_MARK;
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  // These counters are for java.lang.management API support.
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  // They are created even if -XX:-UsePerfData is set and in
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  // that case, they will be allocated on C heap.
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  _classes_loaded_count =
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                 PerfDataManager::create_counter(JAVA_CLS, "loadedClasses",
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                                                 PerfData::U_Events, CHECK);
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  _classes_unloaded_count =
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                 PerfDataManager::create_counter(JAVA_CLS, "unloadedClasses",
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                                                 PerfData::U_Events, CHECK);
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  _shared_classes_loaded_count =
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                 PerfDataManager::create_counter(JAVA_CLS, "sharedLoadedClasses",
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                                                 PerfData::U_Events, CHECK);
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  _shared_classes_unloaded_count =
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                 PerfDataManager::create_counter(JAVA_CLS, "sharedUnloadedClasses",
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                                                 PerfData::U_Events, CHECK);
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  if (UsePerfData) {
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    _classbytes_loaded =
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                 PerfDataManager::create_counter(SUN_CLS, "loadedBytes",
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                                                 PerfData::U_Bytes, CHECK);
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    _classbytes_unloaded =
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                 PerfDataManager::create_counter(SUN_CLS, "unloadedBytes",
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                                                 PerfData::U_Bytes, CHECK);
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    _shared_classbytes_loaded =
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                 PerfDataManager::create_counter(SUN_CLS, "sharedLoadedBytes",
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                                                 PerfData::U_Bytes, CHECK);
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    _shared_classbytes_unloaded =
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                 PerfDataManager::create_counter(SUN_CLS, "sharedUnloadedBytes",
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                                                 PerfData::U_Bytes, CHECK);
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    _class_methods_size =
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                 PerfDataManager::create_variable(SUN_CLS, "methodBytes",
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                                                  PerfData::U_Bytes, CHECK);
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  }
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}
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bool ClassLoadingService::set_verbose(bool verbose) {
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  MutexLocker m(Management_lock);
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  // verbose will be set to the previous value
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  LogLevelType level = verbose ? LogLevel::Info : LogLevel::Off;
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  LogConfiguration::configure_stdout(level, false, LOG_TAGS(class, load));
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  reset_trace_class_unloading();
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  return verbose;
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}
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// Caller to this function must own Management_lock
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void ClassLoadingService::reset_trace_class_unloading() {
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  assert(Management_lock->owned_by_self(), "Must own the Management_lock");
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  bool value = MemoryService::get_verbose() || ClassLoadingService::get_verbose();
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  LogLevelType level = value ? LogLevel::Info : LogLevel::Off;
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  LogConfiguration::configure_stdout(level, false, LOG_TAGS(class, unload));
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}
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jlong ClassLoadingService::loaded_class_count() {
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  return _classes_loaded_count->get_value() + _shared_classes_loaded_count->get_value();
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}
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jlong ClassLoadingService::unloaded_class_count() {
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  return _classes_unloaded_count->get_value() + _shared_classes_unloaded_count->get_value();
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}
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jlong ClassLoadingService::loaded_class_bytes() {
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  return UsePerfData ? _classbytes_loaded->get_value() + _shared_classbytes_loaded->get_value() : -1;
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}
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jlong ClassLoadingService::unloaded_class_bytes() {
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  return UsePerfData ? _classbytes_unloaded->get_value() + _shared_classbytes_unloaded->get_value() : -1;
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}
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jlong ClassLoadingService::loaded_shared_class_count() {
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  return _shared_classes_loaded_count->get_value();
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}
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jlong ClassLoadingService::unloaded_shared_class_count() {
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  return _shared_classes_unloaded_count->get_value();
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}
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jlong ClassLoadingService::loaded_shared_class_bytes() {
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  return UsePerfData ? _shared_classbytes_loaded->get_value() : -1;
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}
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jlong ClassLoadingService::unloaded_shared_class_bytes() {
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  return UsePerfData ? _shared_classbytes_unloaded->get_value() : -1;
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}
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jlong ClassLoadingService::class_method_data_size() {
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  return UsePerfData ? _class_methods_size->get_value() : -1;
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}
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static size_t compute_class_size(InstanceKlass* k) {
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  // lifted from ClassStatistics.do_class(Klass* k)
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  size_t class_size = k->size();
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  if (k->is_instance_klass()) {
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    class_size += k->methods()->size();
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    // FIXME: Need to count the contents of methods
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    class_size += k->constants()->size();
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    class_size += k->local_interfaces()->size();
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    if (k->transitive_interfaces() != nullptr) {
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      class_size += k->transitive_interfaces()->size();
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    }
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    // We do not have to count implementors, since we only store one!
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    // FIXME: How should these be accounted for, now when they have moved.
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    //class_size += k->fields()->size();
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  }
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  return class_size * oopSize;
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}
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void ClassLoadingService::notify_class_loaded(InstanceKlass* k, bool shared_class) {
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  DTRACE_CLASSLOAD_PROBE(loaded, k, shared_class);
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  PerfCounter* classes_counter = (shared_class ? _shared_classes_loaded_count
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                                               : _classes_loaded_count);
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  // increment the count
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  classes_counter->inc();
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  if (UsePerfData) {
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    PerfCounter* classbytes_counter = (shared_class ? _shared_classbytes_loaded
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                                                    : _classbytes_loaded);
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    // add the class size
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    size_t size = compute_class_size(k);
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    classbytes_counter->inc(size);
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  }
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}
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void ClassLoadingService::notify_class_unloaded(InstanceKlass* k) {
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  DTRACE_CLASSLOAD_PROBE(unloaded, k, false);
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  // Classes that can be unloaded must be non-shared
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  _classes_unloaded_count->inc();
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  if (UsePerfData) {
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    // add the class size
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    size_t size = compute_class_size(k);
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    _classbytes_unloaded->inc(size);
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    // Compute method size & subtract from running total.
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    // We are called during phase 1 of mark sweep, so it's
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    // still ok to iterate through Method*s here.
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    Array<Method*>* methods = k->methods();
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    for (int i = 0; i < methods->length(); i++) {
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      _class_methods_size->inc(-methods->at(i)->size());
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    }
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  }
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}
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#endif // INCLUDE_MANAGEMENT
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