26 #define SHARE_GC_SHENANDOAH_SHENANDOAHCOLLECTIONSET_HPP
27
28 #include "memory/allocation.hpp"
29 #include "memory/virtualspace.hpp"
30 #include "gc/shenandoah/shenandoahHeap.hpp"
31 #include "gc/shenandoah/shenandoahHeapRegion.hpp"
32 #include "gc/shenandoah/shenandoahPadding.hpp"
33
34 class ShenandoahCollectionSet : public CHeapObj<mtGC> {
35 friend class ShenandoahHeap;
36 private:
37 size_t const _map_size;
38 size_t const _region_size_bytes_shift;
39 ReservedSpace _map_space;
40 char* const _cset_map;
41 // Bias cset map's base address for fast test if an oop is in cset
42 char* const _biased_cset_map;
43
44 ShenandoahHeap* const _heap;
45
46 size_t _garbage;
47 size_t _used;
48 size_t _region_count;
49
50 shenandoah_padding(0);
51 volatile size_t _current_index;
52 shenandoah_padding(1);
53
54 public:
55 ShenandoahCollectionSet(ShenandoahHeap* heap, ReservedSpace space, char* heap_base);
56
57 // Add region to collection set
58 void add_region(ShenandoahHeapRegion* r);
59
60 // MT version
61 ShenandoahHeapRegion* claim_next();
62
63 // Single-thread version
64 ShenandoahHeapRegion* next();
65
66 size_t count() const { return _region_count; }
67 bool is_empty() const { return _region_count == 0; }
68
69 void clear_current_index() {
70 _current_index = 0;
71 }
72
73 inline bool is_in(ShenandoahHeapRegion* r) const;
74 inline bool is_in(size_t region_idx) const;
75 inline bool is_in(oop obj) const;
76 inline bool is_in_loc(void* loc) const;
77
78 void print_on(outputStream* out) const;
79
80 size_t used() const { return _used; }
81 size_t garbage() const { return _garbage; }
82 void clear();
83
84 private:
85 char* map_address() const {
86 return _cset_map;
87 }
88 char* biased_map_address() const {
89 return _biased_cset_map;
90 }
91 };
92
93 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHCOLLECTIONSET_HPP
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26 #define SHARE_GC_SHENANDOAH_SHENANDOAHCOLLECTIONSET_HPP
27
28 #include "memory/allocation.hpp"
29 #include "memory/virtualspace.hpp"
30 #include "gc/shenandoah/shenandoahHeap.hpp"
31 #include "gc/shenandoah/shenandoahHeapRegion.hpp"
32 #include "gc/shenandoah/shenandoahPadding.hpp"
33
34 class ShenandoahCollectionSet : public CHeapObj<mtGC> {
35 friend class ShenandoahHeap;
36 private:
37 size_t const _map_size;
38 size_t const _region_size_bytes_shift;
39 ReservedSpace _map_space;
40 char* const _cset_map;
41 // Bias cset map's base address for fast test if an oop is in cset
42 char* const _biased_cset_map;
43
44 ShenandoahHeap* const _heap;
45
46 bool _has_old_regions;
47 size_t _garbage;
48 size_t _used;
49 size_t _region_count;
50 size_t _immediate_trash;
51 size_t _evacuation_reserve; // How many bytes reserved in generation for evacuation replicas. This does
52 // not include bytes reserved for old-generation replicas. The value is
53 // conservative in that memory may be reserved for objects that will be promoted.
54 size_t _young_bytes_to_evacuate;
55 size_t _old_bytes_to_evacuate;
56
57 size_t _young_region_count;
58 size_t _old_region_count;
59
60 shenandoah_padding(0);
61 volatile size_t _current_index;
62 shenandoah_padding(1);
63
64 public:
65 ShenandoahCollectionSet(ShenandoahHeap* heap, ReservedSpace space, char* heap_base);
66
67 // Add region to collection set
68 void add_region(ShenandoahHeapRegion* r);
69
70 // MT version
71 ShenandoahHeapRegion* claim_next();
72
73 // Single-thread version
74 ShenandoahHeapRegion* next();
75
76 size_t count() const { return _region_count; }
77 bool is_empty() const { return _region_count == 0; }
78
79 void clear_current_index() {
80 _current_index = 0;
81 }
82
83 inline bool is_in(ShenandoahHeapRegion* r) const;
84 inline bool is_in(size_t region_idx) const;
85 inline bool is_in(oop obj) const;
86 inline bool is_in_loc(void* loc) const;
87
88 void print_on(outputStream* out) const;
89
90 inline size_t get_immediate_trash();
91 inline void set_immediate_trash(size_t immediate_trash);
92
93 // This represents total amount of work to be performed by evacuation, including evacuations to young, to old,
94 // and promotions from young to old. This equals get_young_bytes_reserved_for_evacuation() plus
95 // get_old_bytes_reserved_for_evacuation().
96 inline size_t get_bytes_reserved_for_evacuation();
97
98 // It is not known how many of these bytes will be promoted.
99 inline size_t get_young_bytes_reserved_for_evacuation();
100 inline void reserve_young_bytes_for_evacuation(size_t byte_count);
101
102 inline size_t get_old_bytes_reserved_for_evacuation();
103 inline void reserve_old_bytes_for_evacuation(size_t byte_count);
104
105 inline size_t get_old_region_count();
106
107 inline size_t get_young_region_count();
108
109 bool has_old_regions() const { return _has_old_regions; }
110 size_t used() const { return _used; }
111
112 size_t garbage() const { return _garbage; }
113 void clear();
114
115 private:
116 char* map_address() const {
117 return _cset_map;
118 }
119 char* biased_map_address() const {
120 return _biased_cset_map;
121 }
122 };
123
124 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHCOLLECTIONSET_HPP
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