/*

 * Copyright (c) 1997, 2010, 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

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 */

#ifndef SHARE_VM_OOPS_KLASSKLASS_HPP

#define SHARE_VM_OOPS_KLASSKLASS_HPP

#include "memory/oopFactory.hpp"

#include "oops/klass.hpp"

#include "oops/klassOop.hpp"

// A klassKlass serves as the fix point of the klass chain.

// The klass of klassKlass is itself.

class klassKlass: public Klass {

  friend class VMStructs;

 private:

  juint    _alloc_size;        // allocation profiling support

 public:

  // Testing

  bool oop_is_klass()  const { return true; }

  bool is_leaf_class() const { return true; }

  // Sizing

  int oop_size(oop obj) const;

  int klass_oop_size() const { return object_size(); }

  // Allocation

  DEFINE_ALLOCATE_PERMANENT(klassKlass);

  static klassOop create_klass(TRAPS );

  // Casting from klassOop

  static klassKlass* cast(klassOop k) {

    assert(k->klass_part()->oop_is_klass(), "cast to klassKlass");

    return (klassKlass*) k->klass_part();

  }

  // Sizing

  static int header_size()  { return oopDesc::header_size() + sizeof(klassKlass)/HeapWordSize; }

  int object_size() const   { return align_object_size(header_size()); }

  // Garbage collection

  void oop_follow_contents(oop obj);

  int  oop_adjust_pointers(oop obj);

  // Parallel Scavenge and Parallel Old

  PARALLEL_GC_DECLS

  // Iterators

  int  oop_oop_iterate(oop obj, OopClosure* blk);

  int  oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr);

  // Allocation profiling support

  juint alloc_size() const              { return _alloc_size; }

  void set_alloc_size(juint n)          { _alloc_size = n; }

  // Printing

  void oop_print_value_on(oop obj, outputStream* st);

  void oop_print_on      (oop obj, outputStream* st);

  // Verification

  const char* internal_name() const;

  void oop_verify_on(oop obj, outputStream* st);

};

#endif // SHARE_VM_OOPS_KLASSKLASS_HPP