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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_GC_SHARED_CARDTABLERS_HPP
26 #define SHARE_VM_GC_SHARED_CARDTABLERS_HPP
27
28 #include "gc/shared/cardTableModRefBSForCTRS.hpp"
29 #include "memory/memRegion.hpp"
30
31 class Space;
32 class OopsInGenClosure;
33
34 // Helper to remember modified oops in all klasses.
35 class KlassRemSet {
36 bool _accumulate_modified_oops;
37 public:
38 KlassRemSet() : _accumulate_modified_oops(false) {}
39 void set_accumulate_modified_oops(bool value) { _accumulate_modified_oops = value; }
40 bool accumulate_modified_oops() { return _accumulate_modified_oops; }
41 bool mod_union_is_clear();
42 void clear_mod_union();
43 };
44
45 // This RemSet uses a card table both as shared data structure
46 // for a mod ref barrier set and for the rem set information.
47
48 class CardTableRS: public CHeapObj<mtGC> {
49 friend class VMStructs;
50 // Below are private classes used in impl.
51 friend class VerifyCTSpaceClosure;
52 friend class ClearNoncleanCardWrapper;
53
54 static jbyte clean_card_val() {
55 return CardTableModRefBSForCTRS::clean_card;
56 }
57
58 static intptr_t clean_card_row() {
59 return CardTableModRefBSForCTRS::clean_card_row;
60 }
61
62 static bool
63 card_is_dirty_wrt_gen_iter(jbyte cv) {
64 return CardTableModRefBSForCTRS::card_is_dirty_wrt_gen_iter(cv);
65 }
66
67 KlassRemSet _klass_rem_set;
68 BarrierSet* _bs;
69
70 CardTableModRefBSForCTRS* _ct_bs;
71
72 void verify_space(Space* s, HeapWord* gen_start);
73
74 enum ExtendedCardValue {
75 youngergen_card = CardTableModRefBSForCTRS::CT_MR_BS_last_reserved + 1,
76 // These are for parallel collection.
77 // There are three P (parallel) youngergen card values. In general, this
78 // needs to be more than the number of generations (including the perm
79 // gen) that might have younger_refs_do invoked on them separately. So
80 // if we add more gens, we have to add more values.
81 youngergenP1_card = CardTableModRefBSForCTRS::CT_MR_BS_last_reserved + 2,
82 youngergenP2_card = CardTableModRefBSForCTRS::CT_MR_BS_last_reserved + 3,
83 youngergenP3_card = CardTableModRefBSForCTRS::CT_MR_BS_last_reserved + 4,
84 cur_youngergen_and_prev_nonclean_card =
85 CardTableModRefBSForCTRS::CT_MR_BS_last_reserved + 5
86 };
87
103 _cur_youngergen_card_val = v;
104 }
105 bool is_prev_youngergen_card_val(jbyte v) {
106 return
107 youngergen_card <= v &&
108 v < cur_youngergen_and_prev_nonclean_card &&
109 v != _cur_youngergen_card_val;
110 }
111 // Return a youngergen_card_value that is not currently in use.
112 jbyte find_unused_youngergenP_card_value();
113
114 public:
115 CardTableRS(MemRegion whole_heap);
116 ~CardTableRS();
117
118 // Return the barrier set associated with "this."
119 BarrierSet* bs() { return _bs; }
120
121 // Set the barrier set.
122 void set_bs(BarrierSet* bs) { _bs = bs; }
123
124 KlassRemSet* klass_rem_set() { return &_klass_rem_set; }
125
126 CardTableModRefBSForCTRS* ct_bs() { return _ct_bs; }
127
128 void younger_refs_in_space_iterate(Space* sp, OopsInGenClosure* cl, uint n_threads);
129
130 // Override.
131 void prepare_for_younger_refs_iterate(bool parallel);
132
133 // Card table entries are cleared before application; "blk" is
134 // responsible for dirtying if the oop is still older-to-younger after
135 // closure application.
136 void younger_refs_iterate(Generation* g, OopsInGenClosure* blk, uint n_threads);
137
138 void inline_write_ref_field_gc(void* field, oop new_val) {
139 jbyte* byte = _ct_bs->byte_for(field);
140 *byte = youngergen_card;
141 }
142 void write_ref_field_gc_work(void* field, oop new_val) {
143 inline_write_ref_field_gc(field, new_val);
144 }
|
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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_GC_SHARED_CARDTABLERS_HPP
26 #define SHARE_VM_GC_SHARED_CARDTABLERS_HPP
27
28 #include "gc/shared/cardTableModRefBSForCTRS.hpp"
29 #include "memory/memRegion.hpp"
30
31 class Space;
32 class OopsInGenClosure;
33
34 // This RemSet uses a card table both as shared data structure
35 // for a mod ref barrier set and for the rem set information.
36
37 class CardTableRS: public CHeapObj<mtGC> {
38 friend class VMStructs;
39 // Below are private classes used in impl.
40 friend class VerifyCTSpaceClosure;
41 friend class ClearNoncleanCardWrapper;
42
43 static jbyte clean_card_val() {
44 return CardTableModRefBSForCTRS::clean_card;
45 }
46
47 static intptr_t clean_card_row() {
48 return CardTableModRefBSForCTRS::clean_card_row;
49 }
50
51 static bool
52 card_is_dirty_wrt_gen_iter(jbyte cv) {
53 return CardTableModRefBSForCTRS::card_is_dirty_wrt_gen_iter(cv);
54 }
55
56 BarrierSet* _bs;
57
58 CardTableModRefBSForCTRS* _ct_bs;
59
60 void verify_space(Space* s, HeapWord* gen_start);
61
62 enum ExtendedCardValue {
63 youngergen_card = CardTableModRefBSForCTRS::CT_MR_BS_last_reserved + 1,
64 // These are for parallel collection.
65 // There are three P (parallel) youngergen card values. In general, this
66 // needs to be more than the number of generations (including the perm
67 // gen) that might have younger_refs_do invoked on them separately. So
68 // if we add more gens, we have to add more values.
69 youngergenP1_card = CardTableModRefBSForCTRS::CT_MR_BS_last_reserved + 2,
70 youngergenP2_card = CardTableModRefBSForCTRS::CT_MR_BS_last_reserved + 3,
71 youngergenP3_card = CardTableModRefBSForCTRS::CT_MR_BS_last_reserved + 4,
72 cur_youngergen_and_prev_nonclean_card =
73 CardTableModRefBSForCTRS::CT_MR_BS_last_reserved + 5
74 };
75
91 _cur_youngergen_card_val = v;
92 }
93 bool is_prev_youngergen_card_val(jbyte v) {
94 return
95 youngergen_card <= v &&
96 v < cur_youngergen_and_prev_nonclean_card &&
97 v != _cur_youngergen_card_val;
98 }
99 // Return a youngergen_card_value that is not currently in use.
100 jbyte find_unused_youngergenP_card_value();
101
102 public:
103 CardTableRS(MemRegion whole_heap);
104 ~CardTableRS();
105
106 // Return the barrier set associated with "this."
107 BarrierSet* bs() { return _bs; }
108
109 // Set the barrier set.
110 void set_bs(BarrierSet* bs) { _bs = bs; }
111
112 CardTableModRefBSForCTRS* ct_bs() { return _ct_bs; }
113
114 void younger_refs_in_space_iterate(Space* sp, OopsInGenClosure* cl, uint n_threads);
115
116 // Override.
117 void prepare_for_younger_refs_iterate(bool parallel);
118
119 // Card table entries are cleared before application; "blk" is
120 // responsible for dirtying if the oop is still older-to-younger after
121 // closure application.
122 void younger_refs_iterate(Generation* g, OopsInGenClosure* blk, uint n_threads);
123
124 void inline_write_ref_field_gc(void* field, oop new_val) {
125 jbyte* byte = _ct_bs->byte_for(field);
126 *byte = youngergen_card;
127 }
128 void write_ref_field_gc_work(void* field, oop new_val) {
129 inline_write_ref_field_gc(field, new_val);
130 }
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