Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.hpp @ 1755:8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
Reviewed-by: tonyp, ysr
| author | jcoomes |
|---|---|
| date | Wed, 25 Aug 2010 14:39:55 -0700 |
| parents | fdde661c8e06 |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 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 }; |