JDK14/Java14源码在线阅读

/*
 * 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.
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 */

#ifndef SHARE_CLASSFILE_CLASSLOADER_INLINE_HPP
#define SHARE_CLASSFILE_CLASSLOADER_INLINE_HPP

#include "classfile/classLoader.hpp"
#include "runtime/atomic.hpp"

// Next entry in class path
inline ClassPathEntry* ClassPathEntry::next() const { return Atomic::load_acquire(&_next); }

inline void ClassPathEntry::set_next(ClassPathEntry* next) {
  // may have unlocked readers, so ensure visibility.
  Atomic::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() {
  Arguments::assert_is_dumping_archive();
  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.

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