duke@435: /*
coleenp@4037:  * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSMARKSWEEPDECORATOR_HPP
stefank@2314: #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSMARKSWEEPDECORATOR_HPP
stefank@2314: 
stefank@2314: #include "gc_implementation/shared/mutableSpace.hpp"
stefank@2314: 
duke@435: //
duke@435: // A PSMarkSweepDecorator is used to add "ParallelScavenge" style mark sweep operations
duke@435: // to a MutableSpace.
duke@435: //
duke@435: 
duke@435: class ObjectStartArray;
duke@435: 
zgu@3900: class PSMarkSweepDecorator: public CHeapObj<mtGC> {
duke@435:  private:
duke@435:   static PSMarkSweepDecorator* _destination_decorator;
duke@435: 
duke@435:  protected:
duke@435:   MutableSpace* _space;
duke@435:   ObjectStartArray* _start_array;
duke@435:   HeapWord* _first_dead;
duke@435:   HeapWord* _end_of_live;
duke@435:   HeapWord* _compaction_top;
jcoomes@873:   size_t _allowed_dead_ratio;
duke@435: 
jcoomes@873:   bool insert_deadspace(size_t& allowed_deadspace_words, HeapWord* q,
jcoomes@873:                         size_t word_len);
duke@435: 
duke@435:  public:
duke@435:   PSMarkSweepDecorator(MutableSpace* space, ObjectStartArray* start_array,
jcoomes@873:                        size_t allowed_dead_ratio) :
jcoomes@873:     _space(space), _start_array(start_array),
jcoomes@873:     _allowed_dead_ratio(allowed_dead_ratio) { }
duke@435: 
duke@435:   // During a compacting collection, we need to collapse objects into
duke@435:   // spaces in a given order. We want to fill space A, space B, and so
duke@435:   // on. The code that controls that order is in the following methods.
duke@435:   static void set_destination_decorator_tenured();
duke@435:   static void advance_destination_decorator();
duke@435:   static PSMarkSweepDecorator* destination_decorator();
duke@435: 
duke@435:   // Accessors
jcoomes@873:   MutableSpace* space()                     { return _space; }
jcoomes@873:   ObjectStartArray* start_array()           { return _start_array; }
duke@435: 
jcoomes@873:   HeapWord* compaction_top()                { return _compaction_top; }
jcoomes@873:   void set_compaction_top(HeapWord* value)  { _compaction_top = value; }
duke@435: 
jcoomes@873:   size_t allowed_dead_ratio()               { return _allowed_dead_ratio; }
jcoomes@873:   void set_allowed_dead_ratio(size_t value) { _allowed_dead_ratio = value; }
duke@435: 
duke@435:   // Work methods
duke@435:   void adjust_pointers();
duke@435:   void precompact();
duke@435:   void compact(bool mangle_free_space);
duke@435: };
stefank@2314: 
stefank@2314: #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSMARKSWEEPDECORATOR_HPP