Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.hpp @ 17795:a9becfeecd1b
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| author | kvn |
|---|---|
| date | Wed, 22 Jan 2014 17:42:23 -0800 |
| parents | 55fb97c4c58d 3205e78d8193 |
| children | 4ca6dc0799b6 e5035defa3c4 |
| rev | line source |
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| 342 | 1 /* |
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2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
| 342 | 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. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP | |
| 27 | |
| 28 #include "memory/cardTableModRefBS.hpp" | |
| 29 #include "memory/memRegion.hpp" | |
| 30 #include "oops/oop.inline.hpp" | |
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31 #include "utilities/macros.hpp" |
| 1972 | 32 |
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33 #if INCLUDE_ALL_GCS |
| 342 | 34 |
| 35 class DirtyCardQueueSet; | |
| 36 | |
| 37 // This barrier is specialized to use a logging barrier to support | |
| 38 // snapshot-at-the-beginning marking. | |
| 39 | |
| 40 class G1SATBCardTableModRefBS: public CardTableModRefBSForCTRS { | |
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41 protected: |
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42 enum G1CardValues { |
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43 g1_young_gen = CT_MR_BS_last_reserved << 1 |
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44 }; |
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45 |
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46 public: |
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47 static int g1_young_card_val() { return g1_young_gen; } |
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48 |
| 342 | 49 // Add "pre_val" to a set of objects that may have been disconnected from the |
| 50 // pre-marking object graph. | |
| 51 static void enqueue(oop pre_val); | |
| 52 | |
| 53 G1SATBCardTableModRefBS(MemRegion whole_heap, | |
| 54 int max_covered_regions); | |
| 55 | |
| 56 bool is_a(BarrierSet::Name bsn) { | |
| 57 return bsn == BarrierSet::G1SATBCT || CardTableModRefBS::is_a(bsn); | |
| 58 } | |
| 59 | |
| 60 virtual bool has_write_ref_pre_barrier() { return true; } | |
| 61 | |
| 62 // This notes that we don't need to access any BarrierSet data | |
| 63 // structures, so this can be called from a static context. | |
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64 template <class T> static void write_ref_field_pre_static(T* field, oop newVal) { |
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65 T heap_oop = oopDesc::load_heap_oop(field); |
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66 if (!oopDesc::is_null(heap_oop)) { |
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67 enqueue(oopDesc::decode_heap_oop(heap_oop)); |
| 342 | 68 } |
| 69 } | |
| 70 | |
| 71 // We export this to make it available in cases where the static | |
| 72 // type of the barrier set is known. Note that it is non-virtual. | |
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73 template <class T> inline void inline_write_ref_field_pre(T* field, oop newVal) { |
| 342 | 74 write_ref_field_pre_static(field, newVal); |
| 75 } | |
| 76 | |
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77 // These are the more general virtual versions. |
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78 virtual void write_ref_field_pre_work(oop* field, oop new_val) { |
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79 inline_write_ref_field_pre(field, new_val); |
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80 } |
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81 virtual void write_ref_field_pre_work(narrowOop* field, oop new_val) { |
| 342 | 82 inline_write_ref_field_pre(field, new_val); |
| 83 } | |
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84 virtual void write_ref_field_pre_work(void* field, oop new_val) { |
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85 guarantee(false, "Not needed"); |
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86 } |
| 342 | 87 |
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88 template <class T> void write_ref_array_pre_work(T* dst, int count); |
| 2324 | 89 virtual void write_ref_array_pre(oop* dst, int count, bool dest_uninitialized) { |
| 90 if (!dest_uninitialized) { | |
| 91 write_ref_array_pre_work(dst, count); | |
| 92 } | |
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93 } |
| 2324 | 94 virtual void write_ref_array_pre(narrowOop* dst, int count, bool dest_uninitialized) { |
| 95 if (!dest_uninitialized) { | |
| 96 write_ref_array_pre_work(dst, count); | |
| 97 } | |
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98 } |
| 12343 | 99 |
| 100 /* | |
| 101 Claimed and deferred bits are used together in G1 during the evacuation | |
| 102 pause. These bits can have the following state transitions: | |
| 103 1. The claimed bit can be put over any other card state. Except that | |
| 104 the "dirty -> dirty and claimed" transition is checked for in | |
| 105 G1 code and is not used. | |
| 106 2. Deferred bit can be set only if the previous state of the card | |
| 107 was either clean or claimed. mark_card_deferred() is wait-free. | |
| 108 We do not care if the operation is be successful because if | |
| 109 it does not it will only result in duplicate entry in the update | |
| 110 buffer because of the "cache-miss". So it's not worth spinning. | |
| 111 */ | |
| 112 | |
| 113 bool is_card_claimed(size_t card_index) { | |
| 114 jbyte val = _byte_map[card_index]; | |
| 115 return (val & (clean_card_mask_val() | claimed_card_val())) == claimed_card_val(); | |
| 116 } | |
| 117 | |
| 118 void set_card_claimed(size_t card_index) { | |
| 119 jbyte val = _byte_map[card_index]; | |
| 120 if (val == clean_card_val()) { | |
| 121 val = (jbyte)claimed_card_val(); | |
| 122 } else { | |
| 123 val |= (jbyte)claimed_card_val(); | |
| 124 } | |
| 125 _byte_map[card_index] = val; | |
| 126 } | |
| 127 | |
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128 void verify_g1_young_region(MemRegion mr) PRODUCT_RETURN; |
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129 void g1_mark_as_young(const MemRegion& mr); |
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130 |
| 12343 | 131 bool mark_card_deferred(size_t card_index); |
| 132 | |
| 133 bool is_card_deferred(size_t card_index) { | |
| 134 jbyte val = _byte_map[card_index]; | |
| 135 return (val & (clean_card_mask_val() | deferred_card_val())) == deferred_card_val(); | |
| 136 } | |
| 137 | |
| 342 | 138 }; |
| 139 | |
| 140 // Adds card-table logging to the post-barrier. | |
| 141 // Usual invariant: all dirty cards are logged in the DirtyCardQueueSet. | |
| 142 class G1SATBCardTableLoggingModRefBS: public G1SATBCardTableModRefBS { | |
| 143 private: | |
| 144 DirtyCardQueueSet& _dcqs; | |
| 145 public: | |
| 146 G1SATBCardTableLoggingModRefBS(MemRegion whole_heap, | |
| 147 int max_covered_regions); | |
| 148 | |
| 149 bool is_a(BarrierSet::Name bsn) { | |
| 150 return bsn == BarrierSet::G1SATBCTLogging || | |
| 151 G1SATBCardTableModRefBS::is_a(bsn); | |
| 152 } | |
| 153 | |
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154 void write_ref_field_work(void* field, oop new_val, bool release = false); |
| 342 | 155 |
| 156 // Can be called from static contexts. | |
| 157 static void write_ref_field_static(void* field, oop new_val); | |
| 158 | |
| 159 // NB: if you do a whole-heap invalidation, the "usual invariant" defined | |
| 160 // above no longer applies. | |
| 161 void invalidate(MemRegion mr, bool whole_heap = false); | |
| 162 | |
| 163 void write_region_work(MemRegion mr) { invalidate(mr); } | |
| 164 void write_ref_array_work(MemRegion mr) { invalidate(mr); } | |
| 165 | |
| 166 | |
| 167 }; | |
| 168 | |
| 169 | |
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170 #endif // INCLUDE_ALL_GCS |
| 1972 | 171 |
| 172 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP |