1 /*
   2  * Copyright (c) 2001, 2015, 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 #ifndef SHARE_VM_GC_SERIAL_GENMARKSWEEP_HPP
  26 #define SHARE_VM_GC_SERIAL_GENMARKSWEEP_HPP
  27 
  28 #include "gc/serial/markSweep.hpp"
  29 
  30 class GenMarkSweep : public MarkSweep {
  31   friend class VM_MarkSweep;
  32   friend class G1MarkSweep;
  33  public:
  34   static void invoke_at_safepoint(int level, ReferenceProcessor* rp,
  35                                   bool clear_all_softrefs);
  36 
  37  private:
  38 
  39   // Mark live objects
  40   static void mark_sweep_phase1(int level, bool clear_all_softrefs);
  41   // Calculate new addresses
  42   static void mark_sweep_phase2();
  43   // Update pointers
  44   static void mark_sweep_phase3(int level);
  45   // Move objects to new positions
  46   static void mark_sweep_phase4();
  47 
  48   // Temporary data structures for traversal and storing/restoring marks
  49   static void allocate_stacks();
  50   static void deallocate_stacks();
  51 };
  52 
  53 #endif // SHARE_VM_GC_SERIAL_GENMARKSWEEP_HPP