ysr@777: /*
ysr@777:  * Copyright 2001-2007 Sun Microsystems, Inc.  All Rights Reserved.
ysr@777:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
ysr@777:  *
ysr@777:  * This code is free software; you can redistribute it and/or modify it
ysr@777:  * under the terms of the GNU General Public License version 2 only, as
ysr@777:  * published by the Free Software Foundation.
ysr@777:  *
ysr@777:  * This code is distributed in the hope that it will be useful, but WITHOUT
ysr@777:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
ysr@777:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
ysr@777:  * version 2 for more details (a copy is included in the LICENSE file that
ysr@777:  * accompanied this code).
ysr@777:  *
ysr@777:  * You should have received a copy of the GNU General Public License version
ysr@777:  * 2 along with this work; if not, write to the Free Software Foundation,
ysr@777:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
ysr@777:  *
ysr@777:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
ysr@777:  * CA 95054 USA or visit www.sun.com if you need additional information or
ysr@777:  * have any questions.
ysr@777:  *
ysr@777:  */
ysr@777: 
ysr@777: class ReferenceProcessor;
ysr@777: 
ysr@777: // G1MarkSweep takes care of global mark-compact garbage collection for a
ysr@777: // G1CollectedHeap using a four-phase pointer forwarding algorithm.  All
ysr@777: // generations are assumed to support marking; those that can also support
ysr@777: // compaction.
ysr@777: //
ysr@777: // Class unloading will only occur when a full gc is invoked.
ysr@777: 
ysr@777: 
ysr@777: class G1MarkSweep : AllStatic {
ysr@777:   friend class VM_G1MarkSweep;
ysr@777:   friend class Scavenge;
ysr@777: 
ysr@777:  public:
ysr@777: 
ysr@777:   static void invoke_at_safepoint(ReferenceProcessor* rp,
ysr@777:                                   bool clear_all_softrefs);
ysr@777: 
ysr@777:  private:
ysr@777: 
ysr@777:   // Mark live objects
ysr@777:   static void mark_sweep_phase1(bool& marked_for_deopt,
ysr@777:                                 bool clear_all_softrefs);
ysr@777:   // Calculate new addresses
ysr@777:   static void mark_sweep_phase2();
ysr@777:   // Update pointers
ysr@777:   static void mark_sweep_phase3();
ysr@777:   // Move objects to new positions
ysr@777:   static void mark_sweep_phase4();
ysr@777: 
ysr@777:   static void allocate_stacks();
ysr@777: };