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1 /*
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2 * Copyright 2001-2003 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 class MutableSpace;
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26 class ObjectStartArray;
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27 class PSPromotionManager;
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28 class GCTaskQueue;
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29
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30 class CardTableExtension : public CardTableModRefBS {
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31 private:
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32 // Support methods for resizing the card table.
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33 void resize_commit_uncommit(int changed_region, MemRegion new_region);
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34 void resize_update_card_table_entries(int changed_region,
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35 MemRegion new_region);
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36 void resize_update_committed_table(int changed_region, MemRegion new_region);
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37 void resize_update_covered_table(int changed_region, MemRegion new_region);
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38
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39 protected:
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40
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41 static void verify_all_young_refs_precise_helper(MemRegion mr);
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42
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43 public:
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44 enum ExtendedCardValue {
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45 youngergen_card = CardTableModRefBS::CT_MR_BS_last_reserved + 1,
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46 verify_card = CardTableModRefBS::CT_MR_BS_last_reserved + 5
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47 };
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48
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49 CardTableExtension(MemRegion whole_heap, int max_covered_regions) :
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50 CardTableModRefBS(whole_heap, max_covered_regions) { }
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51
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52 // Too risky for the 4/10/02 putback
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53 // BarrierSet::Name kind() { return BarrierSet::CardTableExtension; }
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54
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55 // Scavenge support
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56 void scavenge_contents(ObjectStartArray* start_array,
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57 MutableSpace* sp,
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58 HeapWord* space_top,
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59 PSPromotionManager* pm);
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60
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61 void scavenge_contents_parallel(ObjectStartArray* start_array,
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62 MutableSpace* sp,
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63 HeapWord* space_top,
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64 PSPromotionManager* pm,
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65 uint stripe_number);
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66
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67 // Verification
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68 static void verify_all_young_refs_imprecise();
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69 static void verify_all_young_refs_precise();
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70
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71 bool addr_is_marked_imprecise(void *addr);
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72 bool addr_is_marked_precise(void *addr);
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73
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74 void set_card_newgen(void* addr) { jbyte* p = byte_for(addr); *p = verify_card; }
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75
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76 // Testers for entries
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77 static bool card_is_dirty(int value) { return value == dirty_card; }
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78 static bool card_is_newgen(int value) { return value == youngergen_card; }
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79 static bool card_is_clean(int value) { return value == clean_card; }
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80 static bool card_is_verify(int value) { return value == verify_card; }
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81
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82 // Card marking
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83 void inline_write_ref_field_gc(oop* field, oop new_val) {
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84 jbyte* byte = byte_for(field);
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85 *byte = youngergen_card;
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86 }
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87
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88 // Adaptive size policy support
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89 // Allows adjustment of the base and size of the covered regions
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90 void resize_covered_region(MemRegion new_region);
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91 // Finds the covered region to resize based on the start address
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92 // of the covered regions.
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93 void resize_covered_region_by_start(MemRegion new_region);
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94 // Finds the covered region to resize based on the end address
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95 // of the covered regions.
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96 void resize_covered_region_by_end(int changed_region, MemRegion new_region);
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97 // Finds the lowest start address of a covered region that is
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98 // previous (i.e., lower index) to the covered region with index "ind".
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99 HeapWord* lowest_prev_committed_start(int ind) const;
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100
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101 #ifdef ASSERT
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102
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103 bool is_valid_card_address(jbyte* addr) {
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104 return (addr >= _byte_map) && (addr < _byte_map + _byte_map_size);
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105 }
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106
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107 #endif // ASSERT
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108 };
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