Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.hpp @ 2132:4947ee68d19c
7008136: CMS: assert((HeapWord*)nextChunk <= _limit) failed: sweep invariant
Summary: The recorded _sweep_limit may not necessarily remain a block boundary as the old generation expands during a concurrent cycle. Terminal actions inside the sweep closure need to be aware of this as they cross over the limit.
Reviewed-by: johnc, minqi
author | ysr |
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date | Thu, 06 Jan 2011 23:50:02 -0800 |
parents | f95d63e2154a |
children | 0ac769a57c64 |
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342 | 1 /* |
1972 | 2 * Copyright (c) 2001, 2010, 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 { | |
40 private: | |
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 public: | |
46 G1SATBCardTableModRefBS(MemRegion whole_heap, | |
47 int max_covered_regions); | |
48 | |
49 bool is_a(BarrierSet::Name bsn) { | |
50 return bsn == BarrierSet::G1SATBCT || CardTableModRefBS::is_a(bsn); | |
51 } | |
52 | |
53 virtual bool has_write_ref_pre_barrier() { return true; } | |
54 | |
55 // This notes that we don't need to access any BarrierSet data | |
56 // structures, so this can be called from a static context. | |
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57 template <class T> static void write_ref_field_pre_static(T* field, oop newVal) { |
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58 T heap_oop = oopDesc::load_heap_oop(field); |
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59 if (!oopDesc::is_null(heap_oop)) { |
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60 enqueue(oopDesc::decode_heap_oop(heap_oop)); |
342 | 61 } |
62 } | |
63 | |
64 // When we know the current java thread: | |
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65 template <class T> static void write_ref_field_pre_static(T* field, oop newVal, |
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66 JavaThread* jt); |
342 | 67 |
68 // We export this to make it available in cases where the static | |
69 // type of the barrier set is known. Note that it is non-virtual. | |
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70 template <class T> inline void inline_write_ref_field_pre(T* field, oop newVal) { |
342 | 71 write_ref_field_pre_static(field, newVal); |
72 } | |
73 | |
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74 // These are the more general virtual versions. |
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75 virtual void write_ref_field_pre_work(oop* field, oop new_val) { |
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76 inline_write_ref_field_pre(field, new_val); |
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77 } |
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78 virtual void write_ref_field_pre_work(narrowOop* field, oop new_val) { |
342 | 79 inline_write_ref_field_pre(field, new_val); |
80 } | |
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81 virtual void write_ref_field_pre_work(void* field, oop new_val) { |
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82 guarantee(false, "Not needed"); |
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83 } |
342 | 84 |
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85 template <class T> void write_ref_array_pre_work(T* dst, int count); |
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86 virtual void write_ref_array_pre(oop* dst, int count) { |
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87 write_ref_array_pre_work(dst, count); |
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88 } |
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89 virtual void write_ref_array_pre(narrowOop* dst, int count) { |
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90 write_ref_array_pre_work(dst, count); |
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91 } |
342 | 92 }; |
93 | |
94 // Adds card-table logging to the post-barrier. | |
95 // Usual invariant: all dirty cards are logged in the DirtyCardQueueSet. | |
96 class G1SATBCardTableLoggingModRefBS: public G1SATBCardTableModRefBS { | |
97 private: | |
98 DirtyCardQueueSet& _dcqs; | |
99 public: | |
100 G1SATBCardTableLoggingModRefBS(MemRegion whole_heap, | |
101 int max_covered_regions); | |
102 | |
103 bool is_a(BarrierSet::Name bsn) { | |
104 return bsn == BarrierSet::G1SATBCTLogging || | |
105 G1SATBCardTableModRefBS::is_a(bsn); | |
106 } | |
107 | |
108 void write_ref_field_work(void* field, oop new_val); | |
109 | |
110 // Can be called from static contexts. | |
111 static void write_ref_field_static(void* field, oop new_val); | |
112 | |
113 // NB: if you do a whole-heap invalidation, the "usual invariant" defined | |
114 // above no longer applies. | |
115 void invalidate(MemRegion mr, bool whole_heap = false); | |
116 | |
117 void write_region_work(MemRegion mr) { invalidate(mr); } | |
118 void write_ref_array_work(MemRegion mr) { invalidate(mr); } | |
119 | |
120 | |
121 }; | |
122 | |
123 | |
124 #endif // SERIALGC | |
1972 | 125 |
126 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP |