68
69 OopStorage* _weak_handles;
70
71 volatile size_t _items_count;
72 DEFINE_PAD_MINUS_SIZE(1, DEFAULT_CACHE_LINE_SIZE, sizeof(volatile size_t));
73 volatile size_t _uncleaned_items_count;
74 DEFINE_PAD_MINUS_SIZE(2, DEFAULT_CACHE_LINE_SIZE, sizeof(volatile size_t));
75
76 double get_load_factor();
77 double get_dead_factor();
78
79 void check_concurrent_work();
80 void trigger_concurrent_work();
81
82 static size_t item_added();
83 static void item_removed();
84 size_t add_items_count_to_clean(size_t ndead);
85
86 StringTable();
87
88 static oop intern(Handle string_or_null_h, jchar* name, int len, TRAPS);
89 oop do_intern(Handle string_or_null, jchar* name, int len, uintx hash, TRAPS);
90 oop do_lookup(jchar* name, int len, uintx hash);
91
92 void concurrent_work(JavaThread* jt);
93 void print_table_statistics(outputStream* st, const char* table_name);
94
95 void try_rehash_table();
96 bool do_rehash();
97
98 public:
99 // The string table
100 static StringTable* the_table() { return _the_table; }
101 size_t table_size();
102
103 static OopStorage* weak_storage() { return the_table()->_weak_handles; }
104
105 static void create_table() {
106 assert(_the_table == NULL, "One string table allowed.");
107 _the_table = new StringTable();
108 }
109
110 static void do_concurrent_work(JavaThread* jt);
131 // Delete pointers to otherwise-unreachable objects.
132 static void unlink(BoolObjectClosure* cl) {
133 unlink_or_oops_do(cl);
134 }
135 static void unlink_or_oops_do(BoolObjectClosure* is_alive, OopClosure* f = NULL,
136 size_t* processed = NULL, size_t* removed = NULL);
137
138 // Serially invoke "f->do_oop" on the locations of all oops in the table.
139 static void oops_do(OopClosure* f);
140
141 // Possibly parallel versions of the above
142 static void possibly_parallel_unlink(
143 OopStorage::ParState<false /* concurrent */, false /* const*/>* par_state_string,
144 BoolObjectClosure* cl, size_t* processed, size_t* removed);
145 static void possibly_parallel_oops_do(
146 OopStorage::ParState<false /* concurrent */, false /* const*/>* par_state_string,
147 OopClosure* f);
148
149 // Probing
150 static oop lookup(Symbol* symbol);
151 static oop lookup(jchar* chars, int length);
152
153 // Interning
154 static oop intern(Symbol* symbol, TRAPS);
155 static oop intern(oop string, TRAPS);
156 static oop intern(const char *utf8_string, TRAPS);
157
158 // Rehash the string table if it gets out of balance
159 static void rehash_table();
160 static bool needs_rehashing()
161 { return StringTable::the_table()->_needs_rehashing; }
162
163 // Sharing
164 private:
165 oop lookup_shared(jchar* name, int len, unsigned int hash) NOT_CDS_JAVA_HEAP_RETURN_(NULL);
166 static void copy_shared_string_table(CompactStringTableWriter* ch_table) NOT_CDS_JAVA_HEAP_RETURN;
167 public:
168 static oop create_archived_string(oop s, Thread* THREAD) NOT_CDS_JAVA_HEAP_RETURN_(NULL);
169 static void set_shared_string_mapped() { _shared_string_mapped = true; }
170 static bool shared_string_mapped() { return _shared_string_mapped; }
171 static void shared_oops_do(OopClosure* f) NOT_CDS_JAVA_HEAP_RETURN;
172 static void write_to_archive() NOT_CDS_JAVA_HEAP_RETURN;
173 static void serialize(SerializeClosure* soc) NOT_CDS_JAVA_HEAP_RETURN;
174
175 // Jcmd
176 static void dump(outputStream* st, bool verbose=false);
177 // Debugging
178 static size_t verify_and_compare_entries();
179 static void verify();
180 };
181
182 #endif // SHARE_VM_CLASSFILE_STRINGTABLE_HPP
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68
69 OopStorage* _weak_handles;
70
71 volatile size_t _items_count;
72 DEFINE_PAD_MINUS_SIZE(1, DEFAULT_CACHE_LINE_SIZE, sizeof(volatile size_t));
73 volatile size_t _uncleaned_items_count;
74 DEFINE_PAD_MINUS_SIZE(2, DEFAULT_CACHE_LINE_SIZE, sizeof(volatile size_t));
75
76 double get_load_factor();
77 double get_dead_factor();
78
79 void check_concurrent_work();
80 void trigger_concurrent_work();
81
82 static size_t item_added();
83 static void item_removed();
84 size_t add_items_count_to_clean(size_t ndead);
85
86 StringTable();
87
88 static oop intern(Handle string_or_null_h, const jchar* name, int len, TRAPS);
89 oop do_intern(Handle string_or_null, const jchar* name, int len, uintx hash, TRAPS);
90 oop do_lookup(const jchar* name, int len, uintx hash);
91
92 void concurrent_work(JavaThread* jt);
93 void print_table_statistics(outputStream* st, const char* table_name);
94
95 void try_rehash_table();
96 bool do_rehash();
97
98 public:
99 // The string table
100 static StringTable* the_table() { return _the_table; }
101 size_t table_size();
102
103 static OopStorage* weak_storage() { return the_table()->_weak_handles; }
104
105 static void create_table() {
106 assert(_the_table == NULL, "One string table allowed.");
107 _the_table = new StringTable();
108 }
109
110 static void do_concurrent_work(JavaThread* jt);
131 // Delete pointers to otherwise-unreachable objects.
132 static void unlink(BoolObjectClosure* cl) {
133 unlink_or_oops_do(cl);
134 }
135 static void unlink_or_oops_do(BoolObjectClosure* is_alive, OopClosure* f = NULL,
136 size_t* processed = NULL, size_t* removed = NULL);
137
138 // Serially invoke "f->do_oop" on the locations of all oops in the table.
139 static void oops_do(OopClosure* f);
140
141 // Possibly parallel versions of the above
142 static void possibly_parallel_unlink(
143 OopStorage::ParState<false /* concurrent */, false /* const*/>* par_state_string,
144 BoolObjectClosure* cl, size_t* processed, size_t* removed);
145 static void possibly_parallel_oops_do(
146 OopStorage::ParState<false /* concurrent */, false /* const*/>* par_state_string,
147 OopClosure* f);
148
149 // Probing
150 static oop lookup(Symbol* symbol);
151 static oop lookup(const jchar* chars, int length);
152
153 // Interning
154 static oop intern(Symbol* symbol, TRAPS);
155 static oop intern(oop string, TRAPS);
156 static oop intern(const char *utf8_string, TRAPS);
157
158 // Rehash the string table if it gets out of balance
159 static void rehash_table();
160 static bool needs_rehashing()
161 { return StringTable::the_table()->_needs_rehashing; }
162
163 // Sharing
164 private:
165 oop lookup_shared(const jchar* name, int len, unsigned int hash) NOT_CDS_JAVA_HEAP_RETURN_(NULL);
166 static void copy_shared_string_table(CompactStringTableWriter* ch_table) NOT_CDS_JAVA_HEAP_RETURN;
167 public:
168 static oop create_archived_string(oop s, Thread* THREAD) NOT_CDS_JAVA_HEAP_RETURN_(NULL);
169 static void set_shared_string_mapped() { _shared_string_mapped = true; }
170 static bool shared_string_mapped() { return _shared_string_mapped; }
171 static void shared_oops_do(OopClosure* f) NOT_CDS_JAVA_HEAP_RETURN;
172 static void write_to_archive() NOT_CDS_JAVA_HEAP_RETURN;
173 static void serialize(SerializeClosure* soc) NOT_CDS_JAVA_HEAP_RETURN;
174
175 // Jcmd
176 static void dump(outputStream* st, bool verbose=false);
177 // Debugging
178 static size_t verify_and_compare_entries();
179 static void verify();
180 };
181
182 #endif // SHARE_VM_CLASSFILE_STRINGTABLE_HPP
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