/*

 * Copyright (c) 2018, 2019, 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_CLASSLOADER_INLINE_HPP

#define SHARE_CLASSFILE_CLASSLOADER_INLINE_HPP

#include "classfile/classLoader.hpp"

#include "runtime/orderAccess.hpp"

// Next entry in class path

inline ClassPathEntry* ClassPathEntry::next() const { return OrderAccess::load_acquire(&_next); }

inline void ClassPathEntry::set_next(ClassPathEntry* next) {

  // may have unlocked readers, so ensure visibility.

  OrderAccess::release_store(&_next, next);

}

inline ClassPathEntry* ClassLoader::classpath_entry(int n) {

  assert(n >= 0, "sanity");

  if (n == 0) {

    assert(has_jrt_entry(), "No class path entry at 0 for exploded module builds");

    return ClassLoader::_jrt_entry;

  } else {

    // The java runtime image is always the first entry

    // in the FileMapInfo::_classpath_entry_table. Even though

    // the _jrt_entry is not included in the _first_append_entry

    // linked list, it must be accounted for when comparing the

    // class path vs. the shared archive class path.

    ClassPathEntry* e = ClassLoader::_first_append_entry;

    while (--n >= 1) {

      assert(e != NULL, "Not that many classpath entries.");

      e = e->next();

    }

    return e;

  }

}

#if INCLUDE_CDS

// Helper function used by CDS code to get the number of boot classpath

// entries during shared classpath setup time.

inline int ClassLoader::num_boot_classpath_entries() {

  assert(has_jrt_entry(), "must have a java runtime image");

  int num_entries = 1; // count the runtime image

  ClassPathEntry* e = ClassLoader::_first_append_entry;

  while (e != NULL) {

    num_entries ++;

    e = e->next();

  }

  return num_entries;

}

inline ClassPathEntry* ClassLoader::get_next_boot_classpath_entry(ClassPathEntry* e) {

  if (e == ClassLoader::_jrt_entry) {

    return ClassLoader::_first_append_entry;

  } else {

    return e->next();

  }

}

// Helper function used by CDS code to get the number of app classpath

// entries during shared classpath setup time.

inline int ClassLoader::num_app_classpath_entries() {

  int num_entries = 0;

  ClassPathEntry* e= ClassLoader::_app_classpath_entries;

  while (e != NULL) {

    num_entries ++;

    e = e->next();

  }

  return num_entries;

}

#endif // INCLUDE_CDS

#endif // SHARE_CLASSFILE_CLASSLOADER_INLINE_HPP