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comparison src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.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 2001-2003 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 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.
33 void resize_commit_uncommit(int changed_region, MemRegion new_region);
34 void resize_update_card_table_entries(int changed_region,
35 MemRegion new_region);
36 void resize_update_committed_table(int changed_region, MemRegion new_region);
37 void resize_update_covered_table(int changed_region, MemRegion new_region);
38
39 protected:
40
41 static void verify_all_young_refs_precise_helper(MemRegion mr);
42
43 public:
44 enum ExtendedCardValue {
45 youngergen_card = CardTableModRefBS::CT_MR_BS_last_reserved + 1,
46 verify_card = CardTableModRefBS::CT_MR_BS_last_reserved + 5
47 };
48
49 CardTableExtension(MemRegion whole_heap, int max_covered_regions) :
50 CardTableModRefBS(whole_heap, max_covered_regions) { }
51
52 // Too risky for the 4/10/02 putback
53 // BarrierSet::Name kind() { return BarrierSet::CardTableExtension; }
54
55 // Scavenge support
56 void scavenge_contents(ObjectStartArray* start_array,
57 MutableSpace* sp,
58 HeapWord* space_top,
59 PSPromotionManager* pm);
60
61 void scavenge_contents_parallel(ObjectStartArray* start_array,
62 MutableSpace* sp,
63 HeapWord* space_top,
64 PSPromotionManager* pm,
65 uint stripe_number);
66
67 // Verification
68 static void verify_all_young_refs_imprecise();
69 static void verify_all_young_refs_precise();
70
71 bool addr_is_marked_imprecise(void *addr);
72 bool addr_is_marked_precise(void *addr);
73
74 void set_card_newgen(void* addr) { jbyte* p = byte_for(addr); *p = verify_card; }
75
76 // Testers for entries
77 static bool card_is_dirty(int value) { return value == dirty_card; }
78 static bool card_is_newgen(int value) { return value == youngergen_card; }
79 static bool card_is_clean(int value) { return value == clean_card; }
80 static bool card_is_verify(int value) { return value == verify_card; }
81
82 // Card marking
83 void inline_write_ref_field_gc(oop* field, oop new_val) {
84 jbyte* byte = byte_for(field);
85 *byte = youngergen_card;
86 }
87
88 // Adaptive size policy support
89 // Allows adjustment of the base and size of the covered regions
90 void resize_covered_region(MemRegion new_region);
91 // Finds the covered region to resize based on the start address
92 // of the covered regions.
93 void resize_covered_region_by_start(MemRegion new_region);
94 // Finds the covered region to resize based on the end address
95 // of the covered regions.
96 void resize_covered_region_by_end(int changed_region, MemRegion new_region);
97 // Finds the lowest start address of a covered region that is
98 // previous (i.e., lower index) to the covered region with index "ind".
99 HeapWord* lowest_prev_committed_start(int ind) const;
100
101 #ifdef ASSERT
102
103 bool is_valid_card_address(jbyte* addr) {
104 return (addr >= _byte_map) && (addr < _byte_map + _byte_map_size);
105 }
106
107 #endif // ASSERT
108 };