Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.hpp @ 1656:4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
Summary: G1 was not handling explicit GCs correctly in many ways. It does now. See the CR for the list of improvements contained in this changeset.
Reviewed-by: iveresov, ysr, johnc
author | tonyp |
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date | Mon, 28 Jun 2010 14:13:17 -0400 |
parents | fdde661c8e06 |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2010, 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 |
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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 class MutableSpace; | |
26 class ObjectStartArray; | |
27 class PSPromotionManager; | |
28 class GCTaskQueue; | |
29 | |
30 class CardTableExtension : public CardTableModRefBS { | |
31 private: | |
32 // Support methods for resizing the card table. | |
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33 // resize_commit_uncommit() returns true if the pages were committed or |
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34 // uncommitted |
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35 bool resize_commit_uncommit(int changed_region, MemRegion new_region); |
0 | 36 void resize_update_card_table_entries(int changed_region, |
37 MemRegion new_region); | |
38 void resize_update_committed_table(int changed_region, MemRegion new_region); | |
39 void resize_update_covered_table(int changed_region, MemRegion new_region); | |
40 | |
41 protected: | |
42 | |
43 static void verify_all_young_refs_precise_helper(MemRegion mr); | |
44 | |
45 public: | |
46 enum ExtendedCardValue { | |
47 youngergen_card = CardTableModRefBS::CT_MR_BS_last_reserved + 1, | |
48 verify_card = CardTableModRefBS::CT_MR_BS_last_reserved + 5 | |
49 }; | |
50 | |
51 CardTableExtension(MemRegion whole_heap, int max_covered_regions) : | |
52 CardTableModRefBS(whole_heap, max_covered_regions) { } | |
53 | |
54 // Too risky for the 4/10/02 putback | |
55 // BarrierSet::Name kind() { return BarrierSet::CardTableExtension; } | |
56 | |
57 // Scavenge support | |
58 void scavenge_contents(ObjectStartArray* start_array, | |
59 MutableSpace* sp, | |
60 HeapWord* space_top, | |
61 PSPromotionManager* pm); | |
62 | |
63 void scavenge_contents_parallel(ObjectStartArray* start_array, | |
64 MutableSpace* sp, | |
65 HeapWord* space_top, | |
66 PSPromotionManager* pm, | |
67 uint stripe_number); | |
68 | |
69 // Verification | |
70 static void verify_all_young_refs_imprecise(); | |
71 static void verify_all_young_refs_precise(); | |
72 | |
73 bool addr_is_marked_imprecise(void *addr); | |
74 bool addr_is_marked_precise(void *addr); | |
75 | |
76 void set_card_newgen(void* addr) { jbyte* p = byte_for(addr); *p = verify_card; } | |
77 | |
78 // Testers for entries | |
79 static bool card_is_dirty(int value) { return value == dirty_card; } | |
80 static bool card_is_newgen(int value) { return value == youngergen_card; } | |
81 static bool card_is_clean(int value) { return value == clean_card; } | |
82 static bool card_is_verify(int value) { return value == verify_card; } | |
83 | |
84 // Card marking | |
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85 void inline_write_ref_field_gc(void* field, oop new_val) { |
0 | 86 jbyte* byte = byte_for(field); |
87 *byte = youngergen_card; | |
88 } | |
89 | |
90 // Adaptive size policy support | |
91 // Allows adjustment of the base and size of the covered regions | |
92 void resize_covered_region(MemRegion new_region); | |
93 // Finds the covered region to resize based on the start address | |
94 // of the covered regions. | |
95 void resize_covered_region_by_start(MemRegion new_region); | |
96 // Finds the covered region to resize based on the end address | |
97 // of the covered regions. | |
98 void resize_covered_region_by_end(int changed_region, MemRegion new_region); | |
99 // Finds the lowest start address of a covered region that is | |
100 // previous (i.e., lower index) to the covered region with index "ind". | |
101 HeapWord* lowest_prev_committed_start(int ind) const; | |
102 | |
103 #ifdef ASSERT | |
104 | |
105 bool is_valid_card_address(jbyte* addr) { | |
106 return (addr >= _byte_map) && (addr < _byte_map + _byte_map_size); | |
107 } | |
108 | |
109 #endif // ASSERT | |
110 }; |