1 /*
   2  * Copyright (c) 2001, 2004, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 class GenMarkSweep : public MarkSweep {
  26   friend class VM_MarkSweep;
  27   friend class G1MarkSweep;
  28  public:
  29   static void invoke_at_safepoint(int level, ReferenceProcessor* rp,
  30                                   bool clear_all_softrefs);
  31 
  32  private:
  33 
  34   // Mark live objects
  35   static void mark_sweep_phase1(int level, bool clear_all_softrefs);
  36   // Calculate new addresses
  37   static void mark_sweep_phase2();
  38   // Update pointers
  39   static void mark_sweep_phase3(int level);
  40   // Move objects to new positions
  41   static void mark_sweep_phase4();
  42 
  43   // Temporary data structures for traversal and storing/restoring marks
  44   static void allocate_stacks();
  45   static void deallocate_stacks();
  46 };