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view src/share/vm/oops/objArrayKlassKlass.hpp @ 3917:eca1193ca245

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4965777: GC changes to support use of discovered field for pending references Summary: If and when the reference handler thread is able to use the discovered field to link reference objects in its pending list, so will GC. In that case, GC will scan through this field once a reference object has been placed on the pending list, but not scan that field before that stage, as the field is used by the concurrent GC thread to link discovered objects. When ReferenceHandleR thread does not use the discovered field for the purpose of linking the elements in the pending list, as would be the case in older JDKs, the JVM will fall back to the old behaviour of using the next field for that purpose. Reviewed-by: jcoomes, mchung, stefank
author ysr
date Wed, 07 Sep 2011 13:55:42 -0700
parents f95d63e2154a
children
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/*
 * 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#ifndef SHARE_VM_OOPS_OBJARRAYKLASSKLASS_HPP
#define SHARE_VM_OOPS_OBJARRAYKLASSKLASS_HPP

#include "oops/arrayKlassKlass.hpp"
#include "oops/objArrayKlass.hpp"

// The objArrayKlassKlass is klass for all objArrayKlass'

class objArrayKlassKlass : public arrayKlassKlass {
 public:
  // Testing
  virtual bool oop_is_objArrayKlass() const { return true; }

  // Dispatched operation
  int oop_size(oop obj) const { return objArrayKlass::cast(klassOop(obj))->object_size(); }
  int klass_oop_size() const  { return object_size(); }

  // Allocation
  DEFINE_ALLOCATE_PERMANENT(objArrayKlassKlass);
  static klassOop create_klass(TRAPS);
  klassOop allocate_objArray_klass(int n, KlassHandle element_klass, TRAPS);
  klassOop allocate_system_objArray_klass(TRAPS); // Used for bootstrapping in Universe::genesis

  // Casting from klassOop
  static objArrayKlassKlass* cast(klassOop k) {
    assert(k->klass_part()->oop_is_klass(), "cast to objArrayKlassKlass");
    return (objArrayKlassKlass*) k->klass_part();
  }

  // Sizing
  static int header_size()  { return oopDesc::header_size() + sizeof(objArrayKlassKlass)/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);

 private:
  // helpers
  static klassOop allocate_objArray_klass_impl(objArrayKlassKlassHandle this_oop, int n, KlassHandle element_klass, TRAPS);

 public:
  // Printing
  void oop_print_value_on(oop obj, outputStream* st);
#ifndef PRODUCT
  void oop_print_on(oop obj, outputStream* st);
#endif //PRODUCT

  // Verification
  const char* internal_name() const;
  void oop_verify_on(oop obj, outputStream* st);

};

#endif // SHARE_VM_OOPS_OBJARRAYKLASSKLASS_HPP