/*

 * Copyright 1997-2003 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 *

 */

/* Copyright 1992 Sun Microsystems, Inc. and Stanford University.

   See the LICENSE file for license information. */

// Age table for adaptive feedback-mediated tenuring (scavenging)

//

// Note: all sizes are in oops

class ageTable VALUE_OBJ_CLASS_SPEC {

  friend class VMStructs;

 public:

  // constants

  enum { table_size = markOopDesc::max_age + 1 };

  // instance variables

  size_t sizes[table_size];

  // constructor.  "global" indicates that this is the global age table

  // (as opposed to gc-thread-local)

  ageTable(bool global = true);

  // clear table

  void clear();

  // add entry

  void add(oop p, size_t oop_size) {

    int age = p->age();

    assert(age > 0 && age < table_size, "invalid age of object");

    sizes[age] += oop_size;

  }

  // Merge another age table with the current one.  Used

  // for parallel young generation gc.

  void merge(ageTable* subTable);

  // calculate new tenuring threshold based on age information

  int compute_tenuring_threshold(size_t survivor_capacity);

 private:

  PerfVariable* _perf_sizes[table_size];

};