jdk-24/src/hotspot/share/oops/instanceClassLoaderKlass.hpp

/*
 * Copyright (c) 2011, 2017, 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_VM_OOPS_INSTANCECLASSLOADERKLASS_HPP
#define SHARE_VM_OOPS_INSTANCECLASSLOADERKLASS_HPP

#include "oops/instanceKlass.hpp"
#include "utilities/macros.hpp"

class ClassFileParser;

// An InstanceClassLoaderKlass is a specialization of the InstanceKlass. It does
// not add any field.  It is added to walk the dependencies for the class loader
// key that this class loader points to.  This is how the loader_data graph is
// walked and dependant class loaders are kept alive.  I thought we walked
// the list later?

class InstanceClassLoaderKlass: public InstanceKlass {
  friend class VMStructs;
  friend class InstanceKlass;
public:
  static const KlassID ID = InstanceClassLoaderKlassID;

private:
  InstanceClassLoaderKlass(const ClassFileParser& parser) : InstanceKlass(parser, InstanceKlass::_misc_kind_class_loader, ID) {}

public:
  InstanceClassLoaderKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }

  // GC specific object visitors
  //
#if INCLUDE_PARALLELGC
  // Parallel Scavenge
  void oop_ps_push_contents(  oop obj, PSPromotionManager* pm);
  // Parallel Compact
  void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
  void oop_pc_update_pointers(oop obj, ParCompactionManager* cm);
#endif

  // Oop fields (and metadata) iterators
  //
  // The InstanceClassLoaderKlass iterators also visit the CLD pointer (or mirror of anonymous klasses.)

 public:
  // Forward iteration
  // Iterate over the oop fields and metadata.
  template <typename T, class OopClosureType>
  inline void oop_oop_iterate(oop obj, OopClosureType* closure);

  // Reverse iteration
  // Iterate over the oop fields and metadata.
  template <typename T, class OopClosureType>
  inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure);

  // Bounded range iteration
  // Iterate over the oop fields and metadata.
  template <typename T, class OopClosureType>
  inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
};

#endif // SHARE_VM_OOPS_INSTANCECLASSLOADERKLASS_HPP