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comparison src/share/vm/gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 2001-2002 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 //
26 // A PSMarkSweepDecorator is used to add "ParallelScavenge" style mark sweep operations
27 // to a MutableSpace.
28 //
29
30 class ObjectStartArray;
31
32 class PSMarkSweepDecorator: public CHeapObj {
33 private:
34 static PSMarkSweepDecorator* _destination_decorator;
35
36 protected:
37 MutableSpace* _space;
38 ObjectStartArray* _start_array;
39 HeapWord* _first_dead;
40 HeapWord* _end_of_live;
41 HeapWord* _compaction_top;
42 unsigned int _allowed_dead_ratio;
43
44 bool insert_deadspace(ssize_t& allowed_deadspace_words, HeapWord* q, size_t word_len);
45
46 public:
47 PSMarkSweepDecorator(MutableSpace* space, ObjectStartArray* start_array,
48 unsigned int allowed_dead_ratio) :
49 _space(space), _start_array(start_array), _allowed_dead_ratio(allowed_dead_ratio) { }
50
51 // During a compacting collection, we need to collapse objects into
52 // spaces in a given order. We want to fill space A, space B, and so
53 // on. The code that controls that order is in the following methods.
54 static void set_destination_decorator_tenured();
55 static void set_destination_decorator_perm_gen();
56 static void advance_destination_decorator();
57 static PSMarkSweepDecorator* destination_decorator();
58
59 // Accessors
60 MutableSpace* space() { return _space; }
61 ObjectStartArray* start_array() { return _start_array; }
62
63 HeapWord* compaction_top() { return _compaction_top; }
64 void set_compaction_top(HeapWord* value) { _compaction_top = value; }
65
66 unsigned int allowed_dead_ratio() { return _allowed_dead_ratio; }
67 void set_allowed_dead_ratio(unsigned int value) { _allowed_dead_ratio = value; }
68
69 // Work methods
70 void adjust_pointers();
71 void precompact();
72 void compact(bool mangle_free_space);
73 };