src/hotspot/share/classfile/classLoaderData.inline.hpp - master - githubmirror/jdk22

src/hotspot/share/classfile/classLoaderData.inline.hpp
88 строк3 KB
Axel Boldt-Christmas
8308387: CLD created and unloading list sharing _next node pointer leads to concurrent YC missing CLD roots
02 июн 2023, 09:35
02 июн 2023, 09:357b0a336
/*
 * Copyright (c) 2011, 2023, 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.
 *
 */

#ifndef SHARE_CLASSFILE_CLASSLOADERDATA_INLINE_HPP
#define SHARE_CLASSFILE_CLASSLOADERDATA_INLINE_HPP

#include "classfile/classLoaderData.hpp"

#include "classfile/javaClasses.hpp"
#include "oops/instanceKlass.hpp"
#include "oops/oop.inline.hpp"
#include "oops/oopHandle.inline.hpp"
#include "oops/weakHandle.inline.hpp"

inline void ClassLoaderData::set_next(ClassLoaderData* next) {
  assert(this->next() == nullptr, "only link once");
  Atomic::store(&_next, next);
}

inline ClassLoaderData* ClassLoaderData::next() const {
  return Atomic::load(&_next);
}

inline void ClassLoaderData::unlink_next() {
  assert(next()->is_unloading(), "only remove unloading clds");
  Atomic::store(&_next, _next->_next);
}

inline void ClassLoaderData::set_unloading_next(ClassLoaderData* unloading_next) {
  assert(this->unloading_next() == nullptr, "only link once");
  _unloading_next = unloading_next;
}

inline ClassLoaderData* ClassLoaderData::unloading_next() const {
  return _unloading_next;
}

inline oop ClassLoaderData::class_loader() const {
  assert(!_unloading, "This oop is not available to unloading class loader data");
  assert(_holder.is_null() || holder_no_keepalive() != nullptr , "This class loader data holder must be alive");
  return _class_loader.resolve();
}

inline oop ClassLoaderData::class_loader_no_keepalive() const {
  assert(!_unloading, "This oop is not available to unloading class loader data");
  assert(_holder.is_null() || holder_no_keepalive() != nullptr , "This class loader data holder must be alive");
  return _class_loader.peek();
}

inline bool ClassLoaderData::is_boot_class_loader_data() const {
  return this == _the_null_class_loader_data || class_loader() == nullptr;
}

inline ClassLoaderData* ClassLoaderData::class_loader_data_or_null(oop loader) {
  if (loader == nullptr) {
    return ClassLoaderData::the_null_class_loader_data();
  }
  return java_lang_ClassLoader::loader_data_acquire(loader);
}

inline ClassLoaderData* ClassLoaderData::class_loader_data(oop loader) {
  ClassLoaderData* loader_data = class_loader_data_or_null(loader);
  assert(loader_data != nullptr, "Must be");
  return loader_data;
}

#endif // SHARE_CLASSFILE_CLASSLOADERDATA_INLINE_HPP