Mercurial > hg > truffle
comparison src/share/vm/gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | 122d10c82f3f |
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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 }; |