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annotate src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.hpp @ 3687:7958ebb561b0
Merge
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Fri, 18 Nov 2011 17:20:38 +0100 |
parents | 92add02409c9 |
children | db9981fd3124 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2011, 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" | |
31 | |
342 | 32 #ifndef SERIALGC |
33 | |
34 class DirtyCardQueueSet; | |
35 | |
36 // This barrier is specialized to use a logging barrier to support | |
37 // snapshot-at-the-beginning marking. | |
38 | |
39 class G1SATBCardTableModRefBS: public CardTableModRefBSForCTRS { | |
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40 public: |
342 | 41 // Add "pre_val" to a set of objects that may have been disconnected from the |
42 // pre-marking object graph. | |
43 static void enqueue(oop pre_val); | |
44 | |
45 G1SATBCardTableModRefBS(MemRegion whole_heap, | |
46 int max_covered_regions); | |
47 | |
48 bool is_a(BarrierSet::Name bsn) { | |
49 return bsn == BarrierSet::G1SATBCT || CardTableModRefBS::is_a(bsn); | |
50 } | |
51 | |
52 virtual bool has_write_ref_pre_barrier() { return true; } | |
53 | |
54 // This notes that we don't need to access any BarrierSet data | |
55 // structures, so this can be called from a static context. | |
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56 template <class T> static void write_ref_field_pre_static(T* field, oop newVal) { |
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57 T heap_oop = oopDesc::load_heap_oop(field); |
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58 if (!oopDesc::is_null(heap_oop)) { |
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59 enqueue(oopDesc::decode_heap_oop(heap_oop)); |
342 | 60 } |
61 } | |
62 | |
63 // We export this to make it available in cases where the static | |
64 // type of the barrier set is known. Note that it is non-virtual. | |
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65 template <class T> inline void inline_write_ref_field_pre(T* field, oop newVal) { |
342 | 66 write_ref_field_pre_static(field, newVal); |
67 } | |
68 | |
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69 // These are the more general virtual versions. |
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70 virtual void write_ref_field_pre_work(oop* field, oop new_val) { |
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71 inline_write_ref_field_pre(field, new_val); |
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72 } |
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73 virtual void write_ref_field_pre_work(narrowOop* field, oop new_val) { |
342 | 74 inline_write_ref_field_pre(field, new_val); |
75 } | |
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76 virtual void write_ref_field_pre_work(void* field, oop new_val) { |
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77 guarantee(false, "Not needed"); |
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78 } |
342 | 79 |
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80 template <class T> void write_ref_array_pre_work(T* dst, int count); |
2324 | 81 virtual void write_ref_array_pre(oop* dst, int count, bool dest_uninitialized) { |
82 if (!dest_uninitialized) { | |
83 write_ref_array_pre_work(dst, count); | |
84 } | |
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85 } |
2324 | 86 virtual void write_ref_array_pre(narrowOop* dst, int count, bool dest_uninitialized) { |
87 if (!dest_uninitialized) { | |
88 write_ref_array_pre_work(dst, count); | |
89 } | |
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90 } |
342 | 91 }; |
92 | |
93 // Adds card-table logging to the post-barrier. | |
94 // Usual invariant: all dirty cards are logged in the DirtyCardQueueSet. | |
95 class G1SATBCardTableLoggingModRefBS: public G1SATBCardTableModRefBS { | |
96 private: | |
97 DirtyCardQueueSet& _dcqs; | |
98 public: | |
99 G1SATBCardTableLoggingModRefBS(MemRegion whole_heap, | |
100 int max_covered_regions); | |
101 | |
102 bool is_a(BarrierSet::Name bsn) { | |
103 return bsn == BarrierSet::G1SATBCTLogging || | |
104 G1SATBCardTableModRefBS::is_a(bsn); | |
105 } | |
106 | |
107 void write_ref_field_work(void* field, oop new_val); | |
108 | |
109 // Can be called from static contexts. | |
110 static void write_ref_field_static(void* field, oop new_val); | |
111 | |
112 // NB: if you do a whole-heap invalidation, the "usual invariant" defined | |
113 // above no longer applies. | |
114 void invalidate(MemRegion mr, bool whole_heap = false); | |
115 | |
116 void write_region_work(MemRegion mr) { invalidate(mr); } | |
117 void write_ref_array_work(MemRegion mr) { invalidate(mr); } | |
118 | |
119 | |
120 }; | |
121 | |
122 | |
123 #endif // SERIALGC | |
1972 | 124 |
125 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP |