Mercurial > hg > truffle
comparison src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.hpp @ 342:37f87013dfd8
6711316: Open source the Garbage-First garbage collector
Summary: First mercurial integration of the code for the Garbage-First garbage collector.
Reviewed-by: apetrusenko, iveresov, jmasa, sgoldman, tonyp, ysr
author | ysr |
---|---|
date | Thu, 05 Jun 2008 15:57:56 -0700 |
parents | |
children | df6caf649ff7 |
comparison
equal
deleted
inserted
replaced
189:0b27f3512f9e | 342:37f87013dfd8 |
---|---|
1 /* | |
2 * Copyright 2001-2007 Sun Microsystems, Inc. All Rights Reserved. | |
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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 #ifndef SERIALGC | |
26 | |
27 class DirtyCardQueueSet; | |
28 | |
29 // This barrier is specialized to use a logging barrier to support | |
30 // snapshot-at-the-beginning marking. | |
31 | |
32 class G1SATBCardTableModRefBS: public CardTableModRefBSForCTRS { | |
33 private: | |
34 // Add "pre_val" to a set of objects that may have been disconnected from the | |
35 // pre-marking object graph. | |
36 static void enqueue(oop pre_val); | |
37 | |
38 public: | |
39 G1SATBCardTableModRefBS(MemRegion whole_heap, | |
40 int max_covered_regions); | |
41 | |
42 bool is_a(BarrierSet::Name bsn) { | |
43 return bsn == BarrierSet::G1SATBCT || CardTableModRefBS::is_a(bsn); | |
44 } | |
45 | |
46 virtual bool has_write_ref_pre_barrier() { return true; } | |
47 | |
48 // This notes that we don't need to access any BarrierSet data | |
49 // structures, so this can be called from a static context. | |
50 static void write_ref_field_pre_static(void* field, oop newVal) { | |
51 assert(!UseCompressedOops, "Else needs to be templatized"); | |
52 oop preVal = *((oop*)field); | |
53 if (preVal != NULL) { | |
54 enqueue(preVal); | |
55 } | |
56 } | |
57 | |
58 // When we know the current java thread: | |
59 static void write_ref_field_pre_static(void* field, oop newVal, | |
60 JavaThread* jt); | |
61 | |
62 // We export this to make it available in cases where the static | |
63 // type of the barrier set is known. Note that it is non-virtual. | |
64 inline void inline_write_ref_field_pre(void* field, oop newVal) { | |
65 write_ref_field_pre_static(field, newVal); | |
66 } | |
67 | |
68 // This is the more general virtual version. | |
69 void write_ref_field_pre_work(void* field, oop new_val) { | |
70 inline_write_ref_field_pre(field, new_val); | |
71 } | |
72 | |
73 virtual void write_ref_array_pre(MemRegion mr); | |
74 | |
75 }; | |
76 | |
77 // Adds card-table logging to the post-barrier. | |
78 // Usual invariant: all dirty cards are logged in the DirtyCardQueueSet. | |
79 class G1SATBCardTableLoggingModRefBS: public G1SATBCardTableModRefBS { | |
80 private: | |
81 DirtyCardQueueSet& _dcqs; | |
82 public: | |
83 G1SATBCardTableLoggingModRefBS(MemRegion whole_heap, | |
84 int max_covered_regions); | |
85 | |
86 bool is_a(BarrierSet::Name bsn) { | |
87 return bsn == BarrierSet::G1SATBCTLogging || | |
88 G1SATBCardTableModRefBS::is_a(bsn); | |
89 } | |
90 | |
91 void write_ref_field_work(void* field, oop new_val); | |
92 | |
93 // Can be called from static contexts. | |
94 static void write_ref_field_static(void* field, oop new_val); | |
95 | |
96 // NB: if you do a whole-heap invalidation, the "usual invariant" defined | |
97 // above no longer applies. | |
98 void invalidate(MemRegion mr, bool whole_heap = false); | |
99 | |
100 void write_region_work(MemRegion mr) { invalidate(mr); } | |
101 void write_ref_array_work(MemRegion mr) { invalidate(mr); } | |
102 | |
103 | |
104 }; | |
105 | |
106 | |
107 #endif // SERIALGC |