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annotate src/share/vm/gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp @ 1562:dfe27f03244a
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date | Tue, 01 Jun 2010 11:48:33 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2008, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 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; | |
438 | 42 size_t _allowed_dead_ratio; |
0 | 43 |
438 | 44 bool insert_deadspace(size_t& allowed_deadspace_words, HeapWord* q, |
45 size_t word_len); | |
0 | 46 |
47 public: | |
48 PSMarkSweepDecorator(MutableSpace* space, ObjectStartArray* start_array, | |
438 | 49 size_t allowed_dead_ratio) : |
50 _space(space), _start_array(start_array), | |
51 _allowed_dead_ratio(allowed_dead_ratio) { } | |
0 | 52 |
53 // During a compacting collection, we need to collapse objects into | |
54 // spaces in a given order. We want to fill space A, space B, and so | |
55 // on. The code that controls that order is in the following methods. | |
56 static void set_destination_decorator_tenured(); | |
57 static void set_destination_decorator_perm_gen(); | |
58 static void advance_destination_decorator(); | |
59 static PSMarkSweepDecorator* destination_decorator(); | |
60 | |
61 // Accessors | |
438 | 62 MutableSpace* space() { return _space; } |
63 ObjectStartArray* start_array() { return _start_array; } | |
0 | 64 |
438 | 65 HeapWord* compaction_top() { return _compaction_top; } |
66 void set_compaction_top(HeapWord* value) { _compaction_top = value; } | |
0 | 67 |
438 | 68 size_t allowed_dead_ratio() { return _allowed_dead_ratio; } |
69 void set_allowed_dead_ratio(size_t value) { _allowed_dead_ratio = value; } | |
0 | 70 |
71 // Work methods | |
72 void adjust_pointers(); | |
73 void precompact(); | |
74 void compact(bool mangle_free_space); | |
75 }; |