46 } while (0)
47
48
49 // Set verification will be forced either if someone defines
50 // HEAP_REGION_SET_FORCE_VERIFY to be 1, or in builds in which
51 // asserts are compiled in.
52 #ifndef HEAP_REGION_SET_FORCE_VERIFY
53 #define HEAP_REGION_SET_FORCE_VERIFY defined(ASSERT)
54 #endif // HEAP_REGION_SET_FORCE_VERIFY
55
56 class HRSMtSafeChecker : public CHeapObj<mtGC> {
57 public:
58 virtual void check() = 0;
59 };
60
61 class MasterFreeRegionListMtSafeChecker : public HRSMtSafeChecker { public: void check(); };
62 class SecondaryFreeRegionListMtSafeChecker : public HRSMtSafeChecker { public: void check(); };
63 class HumongousRegionSetMtSafeChecker : public HRSMtSafeChecker { public: void check(); };
64 class OldRegionSetMtSafeChecker : public HRSMtSafeChecker { public: void check(); };
65
66 class HeapRegionSetCount VALUE_OBJ_CLASS_SPEC {
67 friend class VMStructs;
68 uint _length;
69 size_t _capacity;
70
71 public:
72 HeapRegionSetCount() : _length(0), _capacity(0) { }
73
74 const uint length() const { return _length; }
75 const size_t capacity() const { return _capacity; }
76
77 void increment(uint length_to_add, size_t capacity_to_add) {
78 _length += length_to_add;
79 _capacity += capacity_to_add;
80 }
81
82 void decrement(const uint length_to_remove, const size_t capacity_to_remove) {
83 _length -= length_to_remove;
84 _capacity -= capacity_to_remove;
85 }
86 };
87
88 // Base class for all the classes that represent heap region sets. It
89 // contains the basic attributes that each set needs to maintain
90 // (e.g., length, region num, used bytes sum) plus any shared
91 // functionality (e.g., verification).
92
93 class HeapRegionSetBase VALUE_OBJ_CLASS_SPEC {
94 friend class VMStructs;
95 private:
96 bool _is_humongous;
97 bool _is_free;
98 HRSMtSafeChecker* _mt_safety_checker;
99
100 protected:
101 // The number of regions added to the set. If the set contains
102 // only humongous regions, this reflects only 'starts humongous'
103 // regions and does not include 'continues humongous' ones.
104 HeapRegionSetCount _count;
105
106 const char* _name;
107
108 bool _verify_in_progress;
109
110 // verify_region() is used to ensure that the contents of a region
111 // added to / removed from a set are consistent.
112 void verify_region(HeapRegion* hr) PRODUCT_RETURN;
113
114 // Indicates whether all regions in the set should be humongous or
115 // not. Only used during verification.
116 bool regions_humongous() { return _is_humongous; }
117
118 // Indicates whether all regions in the set should be free or
119 // not. Only used during verification.
120 bool regions_free() { return _is_free; }
121
122 void check_mt_safety() {
123 if (_mt_safety_checker != NULL) {
124 _mt_safety_checker->check();
125 }
126 }
127
128 HeapRegionSetBase(const char* name, bool humongous, bool free, HRSMtSafeChecker* mt_safety_checker);
129
130 public:
131 const char* name() { return _name; }
132
133 uint length() const { return _count.length(); }
134
135 bool is_empty() { return _count.length() == 0; }
136
137 size_t total_capacity_bytes() {
138 return _count.capacity();
139 }
140
141 // It updates the fields of the set to reflect hr being added to
142 // the set and tags the region appropriately.
143 inline void add(HeapRegion* hr);
144
145 // It updates the fields of the set to reflect hr being removed
146 // from the set and tags the region appropriately.
147 inline void remove(HeapRegion* hr);
148
149 virtual void verify();
150 void verify_start();
151 void verify_next_region(HeapRegion* hr);
152 void verify_end();
153
154 #if HEAP_REGION_SET_FORCE_VERIFY
155 void verify_optional() {
156 verify();
157 }
158 #else // HEAP_REGION_SET_FORCE_VERIFY
164
165 #define hrs_assert_sets_match(_set1_, _set2_) \
166 do { \
167 assert(((_set1_)->regions_humongous() == (_set2_)->regions_humongous()) && \
168 ((_set1_)->regions_free() == (_set2_)->regions_free()), \
169 "the contents of set %s and set %s should match", \
170 (_set1_)->name(), \
171 (_set2_)->name()); \
172 } while (0)
173
174 // This class represents heap region sets whose members are not
175 // explicitly tracked. It's helpful to group regions using such sets
176 // so that we can reason about all the region groups in the heap using
177 // the same interface (namely, the HeapRegionSetBase API).
178
179 class HeapRegionSet : public HeapRegionSetBase {
180 public:
181 HeapRegionSet(const char* name, bool humongous, HRSMtSafeChecker* mt_safety_checker):
182 HeapRegionSetBase(name, humongous, false /* free */, mt_safety_checker) { }
183
184 void bulk_remove(const HeapRegionSetCount& removed) {
185 _count.decrement(removed.length(), removed.capacity());
186 }
187 };
188
189 // A set that links all the regions added to it in a doubly-linked
190 // sorted list. We should try to avoid doing operations that iterate over
191 // such lists in performance critical paths. Typically we should
192 // add / remove one region at a time or concatenate two lists.
193
194 class FreeRegionListIterator;
195
196 class FreeRegionList : public HeapRegionSetBase {
197 friend class FreeRegionListIterator;
198
199 private:
200 HeapRegion* _head;
201 HeapRegion* _tail;
202
203 // _last is used to keep track of where we added an element the last
204 // time. It helps to improve performance when adding several ordered items in a row.
205 HeapRegion* _last;
|
46 } while (0)
47
48
49 // Set verification will be forced either if someone defines
50 // HEAP_REGION_SET_FORCE_VERIFY to be 1, or in builds in which
51 // asserts are compiled in.
52 #ifndef HEAP_REGION_SET_FORCE_VERIFY
53 #define HEAP_REGION_SET_FORCE_VERIFY defined(ASSERT)
54 #endif // HEAP_REGION_SET_FORCE_VERIFY
55
56 class HRSMtSafeChecker : public CHeapObj<mtGC> {
57 public:
58 virtual void check() = 0;
59 };
60
61 class MasterFreeRegionListMtSafeChecker : public HRSMtSafeChecker { public: void check(); };
62 class SecondaryFreeRegionListMtSafeChecker : public HRSMtSafeChecker { public: void check(); };
63 class HumongousRegionSetMtSafeChecker : public HRSMtSafeChecker { public: void check(); };
64 class OldRegionSetMtSafeChecker : public HRSMtSafeChecker { public: void check(); };
65
66 // Base class for all the classes that represent heap region sets. It
67 // contains the basic attributes that each set needs to maintain
68 // (e.g., length, region num, used bytes sum) plus any shared
69 // functionality (e.g., verification).
70
71 class HeapRegionSetBase VALUE_OBJ_CLASS_SPEC {
72 friend class VMStructs;
73 private:
74 bool _is_humongous;
75 bool _is_free;
76 HRSMtSafeChecker* _mt_safety_checker;
77
78 protected:
79 // The number of regions in to the set.
80 uint _length;
81
82 const char* _name;
83
84 bool _verify_in_progress;
85
86 // verify_region() is used to ensure that the contents of a region
87 // added to / removed from a set are consistent.
88 void verify_region(HeapRegion* hr) PRODUCT_RETURN;
89
90 // Indicates whether all regions in the set should be humongous or
91 // not. Only used during verification.
92 bool regions_humongous() { return _is_humongous; }
93
94 // Indicates whether all regions in the set should be free or
95 // not. Only used during verification.
96 bool regions_free() { return _is_free; }
97
98 void check_mt_safety() {
99 if (_mt_safety_checker != NULL) {
100 _mt_safety_checker->check();
101 }
102 }
103
104 HeapRegionSetBase(const char* name, bool humongous, bool free, HRSMtSafeChecker* mt_safety_checker);
105
106 public:
107 const char* name() { return _name; }
108
109 uint length() const { return _length; }
110
111 bool is_empty() { return _length == 0; }
112
113 size_t total_capacity_bytes() {
114 return _length * HeapRegion::GrainBytes;
115 }
116
117 // It updates the fields of the set to reflect hr being added to
118 // the set and tags the region appropriately.
119 inline void add(HeapRegion* hr);
120
121 // It updates the fields of the set to reflect hr being removed
122 // from the set and tags the region appropriately.
123 inline void remove(HeapRegion* hr);
124
125 virtual void verify();
126 void verify_start();
127 void verify_next_region(HeapRegion* hr);
128 void verify_end();
129
130 #if HEAP_REGION_SET_FORCE_VERIFY
131 void verify_optional() {
132 verify();
133 }
134 #else // HEAP_REGION_SET_FORCE_VERIFY
140
141 #define hrs_assert_sets_match(_set1_, _set2_) \
142 do { \
143 assert(((_set1_)->regions_humongous() == (_set2_)->regions_humongous()) && \
144 ((_set1_)->regions_free() == (_set2_)->regions_free()), \
145 "the contents of set %s and set %s should match", \
146 (_set1_)->name(), \
147 (_set2_)->name()); \
148 } while (0)
149
150 // This class represents heap region sets whose members are not
151 // explicitly tracked. It's helpful to group regions using such sets
152 // so that we can reason about all the region groups in the heap using
153 // the same interface (namely, the HeapRegionSetBase API).
154
155 class HeapRegionSet : public HeapRegionSetBase {
156 public:
157 HeapRegionSet(const char* name, bool humongous, HRSMtSafeChecker* mt_safety_checker):
158 HeapRegionSetBase(name, humongous, false /* free */, mt_safety_checker) { }
159
160 void bulk_remove(const uint removed) {
161 _length -= removed;
162 }
163 };
164
165 // A set that links all the regions added to it in a doubly-linked
166 // sorted list. We should try to avoid doing operations that iterate over
167 // such lists in performance critical paths. Typically we should
168 // add / remove one region at a time or concatenate two lists.
169
170 class FreeRegionListIterator;
171
172 class FreeRegionList : public HeapRegionSetBase {
173 friend class FreeRegionListIterator;
174
175 private:
176 HeapRegion* _head;
177 HeapRegion* _tail;
178
179 // _last is used to keep track of where we added an element the last
180 // time. It helps to improve performance when adding several ordered items in a row.
181 HeapRegion* _last;
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