23 */
24
25 #ifndef SHARE_VM_MEMORY_BARRIERSET_HPP
26 #define SHARE_VM_MEMORY_BARRIERSET_HPP
27
28 #include "memory/memRegion.hpp"
29 #include "oops/oopsHierarchy.hpp"
30
31 // This class provides the interface between a barrier implementation and
32 // the rest of the system.
33
34 class BarrierSet: public CHeapObj<mtGC> {
35 friend class VMStructs;
36 public:
37 enum Name {
38 ModRef,
39 CardTableModRef,
40 CardTableExtension,
41 G1SATBCT,
42 G1SATBCTLogging,
43 Other,
44 Uninit
45 };
46
47 enum Flags {
48 None = 0,
49 TargetUninitialized = 1
50 };
51 protected:
52 int _max_covered_regions;
53 Name _kind;
54
55 public:
56
57 BarrierSet() { _kind = Uninit; }
58 // To get around prohibition on RTTI.
59 BarrierSet::Name kind() { return _kind; }
60 virtual bool is_a(BarrierSet::Name bsn) = 0;
61
62 // These operations indicate what kind of barriers the BarrierSet has.
120 virtual bool has_write_ref_array_pre_opt() { return true; }
121 virtual bool has_write_ref_array_opt() = 0;
122 virtual bool has_write_prim_array_opt() = 0;
123
124 virtual bool has_read_region_opt() = 0;
125 virtual bool has_write_region_opt() = 0;
126
127 // These operations should assert false unless the correponding operation
128 // above returns true. Otherwise, they should perform an appropriate
129 // barrier for an array whose elements are all in the given memory region.
130 virtual void read_ref_array(MemRegion mr) = 0;
131 virtual void read_prim_array(MemRegion mr) = 0;
132
133 // Below length is the # array elements being written
134 virtual void write_ref_array_pre(oop* dst, int length,
135 bool dest_uninitialized = false) {}
136 virtual void write_ref_array_pre(narrowOop* dst, int length,
137 bool dest_uninitialized = false) {}
138 // Below count is the # array elements being written, starting
139 // at the address "start", which may not necessarily be HeapWord-aligned
140 inline void write_ref_array(HeapWord* start, size_t count);
141
142 // Static versions, suitable for calling from generated code;
143 // count is # array elements being written, starting with "start",
144 // which may not necessarily be HeapWord-aligned.
145 static void static_write_ref_array_pre(HeapWord* start, size_t count);
146 static void static_write_ref_array_post(HeapWord* start, size_t count);
147
148 protected:
149 virtual void write_ref_array_work(MemRegion mr) = 0;
150 public:
151 virtual void write_prim_array(MemRegion mr) = 0;
152
153 virtual void read_region(MemRegion mr) = 0;
154
155 // (For efficiency reasons, this operation is specialized for certain
156 // barrier types. Semantically, it should be thought of as a call to the
157 // virtual "_work" function below, which must implement the barrier.)
158 inline void write_region(MemRegion mr);
159 protected:
160 virtual void write_region_work(MemRegion mr) = 0;
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23 */
24
25 #ifndef SHARE_VM_MEMORY_BARRIERSET_HPP
26 #define SHARE_VM_MEMORY_BARRIERSET_HPP
27
28 #include "memory/memRegion.hpp"
29 #include "oops/oopsHierarchy.hpp"
30
31 // This class provides the interface between a barrier implementation and
32 // the rest of the system.
33
34 class BarrierSet: public CHeapObj<mtGC> {
35 friend class VMStructs;
36 public:
37 enum Name {
38 ModRef,
39 CardTableModRef,
40 CardTableExtension,
41 G1SATBCT,
42 G1SATBCTLogging,
43 ShenandoahBarrierSet,
44 Other,
45 Uninit
46 };
47
48 enum Flags {
49 None = 0,
50 TargetUninitialized = 1
51 };
52 protected:
53 int _max_covered_regions;
54 Name _kind;
55
56 public:
57
58 BarrierSet() { _kind = Uninit; }
59 // To get around prohibition on RTTI.
60 BarrierSet::Name kind() { return _kind; }
61 virtual bool is_a(BarrierSet::Name bsn) = 0;
62
63 // These operations indicate what kind of barriers the BarrierSet has.
121 virtual bool has_write_ref_array_pre_opt() { return true; }
122 virtual bool has_write_ref_array_opt() = 0;
123 virtual bool has_write_prim_array_opt() = 0;
124
125 virtual bool has_read_region_opt() = 0;
126 virtual bool has_write_region_opt() = 0;
127
128 // These operations should assert false unless the correponding operation
129 // above returns true. Otherwise, they should perform an appropriate
130 // barrier for an array whose elements are all in the given memory region.
131 virtual void read_ref_array(MemRegion mr) = 0;
132 virtual void read_prim_array(MemRegion mr) = 0;
133
134 // Below length is the # array elements being written
135 virtual void write_ref_array_pre(oop* dst, int length,
136 bool dest_uninitialized = false) {}
137 virtual void write_ref_array_pre(narrowOop* dst, int length,
138 bool dest_uninitialized = false) {}
139 // Below count is the # array elements being written, starting
140 // at the address "start", which may not necessarily be HeapWord-aligned
141 virtual void write_ref_array(HeapWord* start, size_t count);
142
143 // Static versions, suitable for calling from generated code;
144 // count is # array elements being written, starting with "start",
145 // which may not necessarily be HeapWord-aligned.
146 static void static_write_ref_array_pre(HeapWord* start, size_t count);
147 static void static_write_ref_array_post(HeapWord* start, size_t count);
148
149 protected:
150 virtual void write_ref_array_work(MemRegion mr) = 0;
151 public:
152 virtual void write_prim_array(MemRegion mr) = 0;
153
154 virtual void read_region(MemRegion mr) = 0;
155
156 // (For efficiency reasons, this operation is specialized for certain
157 // barrier types. Semantically, it should be thought of as a call to the
158 // virtual "_work" function below, which must implement the barrier.)
159 inline void write_region(MemRegion mr);
160 protected:
161 virtual void write_region_work(MemRegion mr) = 0;
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