93 SymbolTableConfig, mtSymbol> SymbolTableHash;
94
95 class SymbolTableCreateEntry;
96
97 class SymbolTable : public CHeapObj<mtSymbol> {
98 friend class VMStructs;
99 friend class Symbol;
100 friend class ClassFileParser;
101 friend class SymbolTableConfig;
102 friend class SymbolTableCreateEntry;
103
104 private:
105 static void delete_symbol(Symbol* sym);
106 void grow(JavaThread* jt);
107 void clean_dead_entries(JavaThread* jt);
108
109 // The symbol table
110 static SymbolTable* _the_table;
111 // Shared symbol table.
112 static CompactHashtable<Symbol*, char> _shared_table;
113 static bool _lookup_shared_first;
114 static bool _alt_hash;
115
116 // For statistics
117 static int _symbols_removed;
118 static int _symbols_counted;
119
120 // Set if one bucket is out of balance due to hash algorithm deficiency
121 SymbolTableHash* _local_table;
122 size_t _current_size;
123 volatile bool _has_work;
124 volatile bool _needs_rehashing;
125
126 volatile int _items;
127 DEFINE_PAD_MINUS_SIZE(1, DEFAULT_CACHE_LINE_SIZE, sizeof(volatile int));
128 volatile int _uncleaned_items;
129 DEFINE_PAD_MINUS_SIZE(2, DEFAULT_CACHE_LINE_SIZE, sizeof(volatile int));
130
131 double get_load_factor();
132 double get_dead_factor();
133
134 void check_concurrent_work();
135 void trigger_concurrent_work();
136
137 static uintx item_added();
138 static void item_removed();
139 static void set_item_clean_count(size_t ncl);
140 static void mark_item_clean_count();
141
142 SymbolTable();
143
144 Symbol* allocate_symbol(const u1* name, int len, bool c_heap, TRAPS); // Assumes no characters larger than 0x7F
145 Symbol* do_lookup(char* name, int len, uintx hash);
146 Symbol* do_add_if_needed(char* name, int len, uintx hash, bool heap, TRAPS);
147
148 // Adding elements
149 static void add(ClassLoaderData* loader_data,
150 const constantPoolHandle& cp, int names_count,
151 const char** names, int* lengths, int* cp_indices,
152 unsigned int* hashValues, TRAPS);
153
154 static void new_symbols(ClassLoaderData* loader_data,
155 const constantPoolHandle& cp, int names_count,
156 const char** name, int* lengths,
157 int* cp_indices, unsigned int* hashValues,
158 TRAPS) {
159 add(loader_data, cp, names_count, name, lengths, cp_indices, hashValues, THREAD);
160 }
161
162 static Symbol* lookup_shared(const char* name, int len, unsigned int hash);
163 Symbol* lookup_dynamic(const char* name, int len, unsigned int hash);
164 Symbol* lookup_common(const char* name, int len, unsigned int hash);
165
166 // Arena for permanent symbols (null class loader) that are never unloaded
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93 SymbolTableConfig, mtSymbol> SymbolTableHash;
94
95 class SymbolTableCreateEntry;
96
97 class SymbolTable : public CHeapObj<mtSymbol> {
98 friend class VMStructs;
99 friend class Symbol;
100 friend class ClassFileParser;
101 friend class SymbolTableConfig;
102 friend class SymbolTableCreateEntry;
103
104 private:
105 static void delete_symbol(Symbol* sym);
106 void grow(JavaThread* jt);
107 void clean_dead_entries(JavaThread* jt);
108
109 // The symbol table
110 static SymbolTable* _the_table;
111 // Shared symbol table.
112 static CompactHashtable<Symbol*, char> _shared_table;
113 static volatile bool _lookup_shared_first;
114 static volatile bool _alt_hash;
115
116 // For statistics
117 volatile size_t _symbols_removed;
118 volatile size_t _symbols_counted;
119
120 SymbolTableHash* _local_table;
121 size_t _current_size;
122 volatile bool _has_work;
123 // Set if one bucket is out of balance due to hash algorithm deficiency
124 volatile bool _needs_rehashing;
125
126 volatile size_t _items_count;
127 volatile size_t _uncleaned_items_count;
128
129 double get_load_factor();
130 double get_dead_factor();
131
132 void check_concurrent_work();
133 void trigger_concurrent_work();
134
135 static void item_added();
136 static void item_removed();
137 static void set_item_clean_count(size_t ncl);
138 static void mark_item_clean_count();
139
140 SymbolTable();
141
142 Symbol* allocate_symbol(const char* name, int len, bool c_heap, TRAPS); // Assumes no characters larger than 0x7F
143 Symbol* do_lookup(const char* name, int len, uintx hash);
144 Symbol* do_add_if_needed(const char* name, int len, uintx hash, bool heap, TRAPS);
145
146 // Adding elements
147 static void add(ClassLoaderData* loader_data,
148 const constantPoolHandle& cp, int names_count,
149 const char** names, int* lengths, int* cp_indices,
150 unsigned int* hashValues, TRAPS);
151
152 static void new_symbols(ClassLoaderData* loader_data,
153 const constantPoolHandle& cp, int names_count,
154 const char** name, int* lengths,
155 int* cp_indices, unsigned int* hashValues,
156 TRAPS) {
157 add(loader_data, cp, names_count, name, lengths, cp_indices, hashValues, THREAD);
158 }
159
160 static Symbol* lookup_shared(const char* name, int len, unsigned int hash);
161 Symbol* lookup_dynamic(const char* name, int len, unsigned int hash);
162 Symbol* lookup_common(const char* name, int len, unsigned int hash);
163
164 // Arena for permanent symbols (null class loader) that are never unloaded
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