Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.hpp @ 10180:ebded0261dfc
8012111: Remove warning about CMS generation shrinking.
Reviewed-by: johnc, brutisso, stefank
author | jmasa |
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date | Mon, 22 Apr 2013 22:00:03 -0700 |
parents | f81a7c0c618d |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
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13 * accompanied this code). | |
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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 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_CARDTABLEEXTENSION_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_CARDTABLEEXTENSION_HPP | |
27 | |
28 #include "memory/cardTableModRefBS.hpp" | |
29 | |
0 | 30 class MutableSpace; |
31 class ObjectStartArray; | |
32 class PSPromotionManager; | |
33 class GCTaskQueue; | |
34 | |
35 class CardTableExtension : public CardTableModRefBS { | |
36 private: | |
37 // Support methods for resizing the card table. | |
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38 // resize_commit_uncommit() returns true if the pages were committed or |
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39 // uncommitted |
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40 bool resize_commit_uncommit(int changed_region, MemRegion new_region); |
0 | 41 void resize_update_card_table_entries(int changed_region, |
42 MemRegion new_region); | |
43 void resize_update_committed_table(int changed_region, MemRegion new_region); | |
44 void resize_update_covered_table(int changed_region, MemRegion new_region); | |
45 | |
46 protected: | |
47 | |
48 static void verify_all_young_refs_precise_helper(MemRegion mr); | |
49 | |
50 public: | |
51 enum ExtendedCardValue { | |
52 youngergen_card = CardTableModRefBS::CT_MR_BS_last_reserved + 1, | |
53 verify_card = CardTableModRefBS::CT_MR_BS_last_reserved + 5 | |
54 }; | |
55 | |
56 CardTableExtension(MemRegion whole_heap, int max_covered_regions) : | |
57 CardTableModRefBS(whole_heap, max_covered_regions) { } | |
58 | |
59 // Too risky for the 4/10/02 putback | |
60 // BarrierSet::Name kind() { return BarrierSet::CardTableExtension; } | |
61 | |
62 // Scavenge support | |
63 void scavenge_contents_parallel(ObjectStartArray* start_array, | |
64 MutableSpace* sp, | |
65 HeapWord* space_top, | |
66 PSPromotionManager* pm, | |
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67 uint stripe_number, |
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68 uint stripe_total); |
0 | 69 |
70 // Verification | |
71 static void verify_all_young_refs_imprecise(); | |
72 static void verify_all_young_refs_precise(); | |
73 | |
74 bool addr_is_marked_imprecise(void *addr); | |
75 bool addr_is_marked_precise(void *addr); | |
76 | |
77 void set_card_newgen(void* addr) { jbyte* p = byte_for(addr); *p = verify_card; } | |
78 | |
79 // Testers for entries | |
80 static bool card_is_dirty(int value) { return value == dirty_card; } | |
81 static bool card_is_newgen(int value) { return value == youngergen_card; } | |
82 static bool card_is_clean(int value) { return value == clean_card; } | |
83 static bool card_is_verify(int value) { return value == verify_card; } | |
84 | |
85 // Card marking | |
113
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86 void inline_write_ref_field_gc(void* field, oop new_val) { |
0 | 87 jbyte* byte = byte_for(field); |
88 *byte = youngergen_card; | |
89 } | |
90 | |
91 // Adaptive size policy support | |
92 // Allows adjustment of the base and size of the covered regions | |
93 void resize_covered_region(MemRegion new_region); | |
94 // Finds the covered region to resize based on the start address | |
95 // of the covered regions. | |
96 void resize_covered_region_by_start(MemRegion new_region); | |
97 // Finds the covered region to resize based on the end address | |
98 // of the covered regions. | |
99 void resize_covered_region_by_end(int changed_region, MemRegion new_region); | |
100 // Finds the lowest start address of a covered region that is | |
101 // previous (i.e., lower index) to the covered region with index "ind". | |
102 HeapWord* lowest_prev_committed_start(int ind) const; | |
103 | |
104 #ifdef ASSERT | |
105 | |
106 bool is_valid_card_address(jbyte* addr) { | |
107 return (addr >= _byte_map) && (addr < _byte_map + _byte_map_size); | |
108 } | |
109 | |
110 #endif // ASSERT | |
111 }; | |
1972 | 112 |
113 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_CARDTABLEEXTENSION_HPP |