Mercurial > hg > truffle
annotate src/share/vm/classfile/symbolTable.hpp @ 6233:d5bc62fcfac7
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_CLASSFILE_SYMBOLTABLE_HPP |
26 #define SHARE_VM_CLASSFILE_SYMBOLTABLE_HPP | |
27 | |
28 #include "memory/allocation.inline.hpp" | |
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29 #include "oops/symbol.hpp" |
1972 | 30 #include "utilities/hashtable.hpp" |
31 | |
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32 // The symbol table holds all Symbol*s and corresponding interned strings. |
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33 // Symbol*s and literal strings should be canonicalized. |
0 | 34 // |
35 // The interned strings are created lazily. | |
36 // | |
37 // It is implemented as an open hash table with a fixed number of buckets. | |
38 // | |
39 // %note: | |
40 // - symbolTableEntrys are allocated in blocks to reduce the space overhead. | |
41 | |
42 class BoolObjectClosure; | |
6162 | 43 class outputStream; |
0 | 44 |
45 | |
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46 // Class to hold a newly created or referenced Symbol* temporarily in scope. |
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47 // new_symbol() and lookup() will create a Symbol* if not already in the |
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48 // symbol table and add to the symbol's reference count. |
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49 // probe() and lookup_only() will increment the refcount if symbol is found. |
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50 class TempNewSymbol : public StackObj { |
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51 Symbol* _temp; |
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52 |
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53 public: |
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54 TempNewSymbol() : _temp(NULL) {} |
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55 // Creating or looking up a symbol increments the symbol's reference count |
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56 TempNewSymbol(Symbol *s) : _temp(s) {} |
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57 |
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58 // Operator= increments reference count. |
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59 void operator=(const TempNewSymbol &s) { |
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60 _temp = s._temp; |
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61 if (_temp !=NULL) _temp->increment_refcount(); |
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62 } |
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63 |
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64 // Decrement reference counter so it can go away if it's unique |
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65 ~TempNewSymbol() { if (_temp != NULL) _temp->decrement_refcount(); } |
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66 |
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67 // Operators so they can be used like Symbols |
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68 Symbol* operator -> () const { return _temp; } |
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69 bool operator == (Symbol* o) const { return _temp == o; } |
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70 // Sneaky conversion function |
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71 operator Symbol*() { return _temp; } |
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72 }; |
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73 |
6197 | 74 class SymbolTable : public Hashtable<Symbol*, mtSymbol> { |
0 | 75 friend class VMStructs; |
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76 friend class ClassFileParser; |
0 | 77 |
78 private: | |
79 // The symbol table | |
80 static SymbolTable* _the_table; | |
81 | |
6162 | 82 // Set if one bucket is out of balance due to hash algorithm deficiency |
83 static bool _needs_rehashing; | |
84 | |
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85 // For statistics |
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86 static int symbols_removed; |
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87 static int symbols_counted; |
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88 |
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89 Symbol* allocate_symbol(const u1* name, int len, bool c_heap, TRAPS); // Assumes no characters larger than 0x7F |
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90 |
0 | 91 // Adding elements |
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92 Symbol* basic_add(int index, u1* name, int len, unsigned int hashValue, |
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93 bool c_heap, TRAPS); |
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94 |
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95 bool basic_add(Handle class_loader, constantPoolHandle cp, int names_count, |
0 | 96 const char** names, int* lengths, int* cp_indices, |
97 unsigned int* hashValues, TRAPS); | |
98 | |
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99 static void new_symbols(Handle class_loader, constantPoolHandle cp, |
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100 int names_count, |
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101 const char** name, int* lengths, |
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102 int* cp_indices, unsigned int* hashValues, |
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103 TRAPS) { |
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104 add(class_loader, cp, names_count, name, lengths, cp_indices, hashValues, THREAD); |
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105 } |
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106 |
0 | 107 // Table size |
108 enum { | |
109 symbol_table_size = 20011 | |
110 }; | |
111 | |
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112 Symbol* lookup(int index, const char* name, int len, unsigned int hash); |
0 | 113 |
114 SymbolTable() | |
6197 | 115 : Hashtable<Symbol*, mtSymbol>(symbol_table_size, sizeof (HashtableEntry<Symbol*, mtSymbol>)) {} |
0 | 116 |
6197 | 117 SymbolTable(HashtableBucket<mtSymbol>* t, int number_of_entries) |
118 : Hashtable<Symbol*, mtSymbol>(symbol_table_size, sizeof (HashtableEntry<Symbol*, mtSymbol>), t, | |
0 | 119 number_of_entries) {} |
120 | |
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121 // Arena for permanent symbols (null class loader) that are never unloaded |
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122 static Arena* _arena; |
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123 static Arena* arena() { return _arena; } // called for statistics |
0 | 124 |
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125 static void initialize_symbols(int arena_alloc_size = 0); |
0 | 126 public: |
127 enum { | |
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128 symbol_alloc_batch_size = 8, |
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129 // Pick initial size based on java -version size measurements |
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130 symbol_alloc_arena_size = 360*K |
0 | 131 }; |
132 | |
133 // The symbol table | |
134 static SymbolTable* the_table() { return _the_table; } | |
135 | |
136 static void create_table() { | |
137 assert(_the_table == NULL, "One symbol table allowed."); | |
138 _the_table = new SymbolTable(); | |
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139 initialize_symbols(symbol_alloc_arena_size); |
0 | 140 } |
141 | |
6197 | 142 static void create_table(HashtableBucket<mtSymbol>* t, int length, |
0 | 143 int number_of_entries) { |
144 assert(_the_table == NULL, "One symbol table allowed."); | |
6197 | 145 assert(length == symbol_table_size * sizeof(HashtableBucket<mtSymbol>), |
0 | 146 "bad shared symbol size."); |
147 _the_table = new SymbolTable(t, number_of_entries); | |
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148 // if CDS give symbol table a default arena size since most symbols |
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149 // are already allocated in the shared misc section. |
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150 initialize_symbols(); |
0 | 151 } |
152 | |
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153 static unsigned int hash_symbol(const char* s, int len); |
6162 | 154 |
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155 static Symbol* lookup(const char* name, int len, TRAPS); |
0 | 156 // lookup only, won't add. Also calculate hash. |
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157 static Symbol* lookup_only(const char* name, int len, unsigned int& hash); |
0 | 158 // Only copy to C string to be added if lookup failed. |
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159 static Symbol* lookup(const Symbol* sym, int begin, int end, TRAPS); |
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160 |
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161 static void release(Symbol* sym); |
0 | 162 |
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163 // Look up the address of the literal in the SymbolTable for this Symbol* |
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164 static Symbol** lookup_symbol_addr(Symbol* sym); |
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165 |
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166 // jchar (utf16) version of lookups |
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167 static Symbol* lookup_unicode(const jchar* name, int len, TRAPS); |
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168 static Symbol* lookup_only_unicode(const jchar* name, int len, unsigned int& hash); |
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169 |
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170 static void add(Handle class_loader, constantPoolHandle cp, int names_count, |
0 | 171 const char** names, int* lengths, int* cp_indices, |
172 unsigned int* hashValues, TRAPS); | |
173 | |
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174 // Release any dead symbols |
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175 static void unlink(); |
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176 |
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177 // iterate over symbols |
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178 static void symbols_do(SymbolClosure *cl); |
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179 |
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180 // Symbol creation |
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181 static Symbol* new_symbol(const char* utf8_buffer, int length, TRAPS) { |
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182 assert(utf8_buffer != NULL, "just checking"); |
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183 return lookup(utf8_buffer, length, THREAD); |
0 | 184 } |
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185 static Symbol* new_symbol(const char* name, TRAPS) { |
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186 return new_symbol(name, (int)strlen(name), THREAD); |
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187 } |
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188 static Symbol* new_symbol(const Symbol* sym, int begin, int end, TRAPS) { |
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189 assert(begin <= end && end <= sym->utf8_length(), "just checking"); |
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190 return lookup(sym, begin, end, THREAD); |
0 | 191 } |
192 | |
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193 // Create a symbol in the arena for symbols that are not deleted |
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194 static Symbol* new_permanent_symbol(const char* name, TRAPS); |
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195 |
0 | 196 // Symbol lookup |
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197 static Symbol* lookup(int index, const char* name, int len, TRAPS); |
0 | 198 |
199 // Needed for preloading classes in signatures when compiling. | |
200 // Returns the symbol is already present in symbol table, otherwise | |
201 // NULL. NO ALLOCATION IS GUARANTEED! | |
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202 static Symbol* probe(const char* name, int len) { |
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203 unsigned int ignore_hash; |
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204 return lookup_only(name, len, ignore_hash); |
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205 } |
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206 static Symbol* probe_unicode(const jchar* name, int len) { |
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207 unsigned int ignore_hash; |
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208 return lookup_only_unicode(name, len, ignore_hash); |
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209 } |
0 | 210 |
211 // Histogram | |
212 static void print_histogram() PRODUCT_RETURN; | |
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213 static void print() PRODUCT_RETURN; |
0 | 214 |
215 // Debugging | |
216 static void verify(); | |
6162 | 217 static void dump(outputStream* st); |
0 | 218 |
219 // Sharing | |
220 static void copy_buckets(char** top, char*end) { | |
6197 | 221 the_table()->Hashtable<Symbol*, mtSymbol>::copy_buckets(top, end); |
0 | 222 } |
223 static void copy_table(char** top, char*end) { | |
6197 | 224 the_table()->Hashtable<Symbol*, mtSymbol>::copy_table(top, end); |
0 | 225 } |
226 static void reverse(void* boundary = NULL) { | |
6197 | 227 the_table()->Hashtable<Symbol*, mtSymbol>::reverse(boundary); |
0 | 228 } |
6162 | 229 |
230 // Rehash the symbol table if it gets out of balance | |
231 static void rehash_table(); | |
232 static bool needs_rehashing() { return _needs_rehashing; } | |
0 | 233 }; |
234 | |
6197 | 235 class StringTable : public Hashtable<oop, mtSymbol> { |
0 | 236 friend class VMStructs; |
237 | |
238 private: | |
239 // The string table | |
240 static StringTable* _the_table; | |
241 | |
6162 | 242 // Set if one bucket is out of balance due to hash algorithm deficiency |
243 static bool _needs_rehashing; | |
244 | |
0 | 245 static oop intern(Handle string_or_null, jchar* chars, int length, TRAPS); |
246 oop basic_add(int index, Handle string_or_null, jchar* name, int len, | |
247 unsigned int hashValue, TRAPS); | |
248 | |
249 oop lookup(int index, jchar* chars, int length, unsigned int hashValue); | |
250 | |
6197 | 251 StringTable() : Hashtable<oop, mtSymbol>((int)StringTableSize, |
252 sizeof (HashtableEntry<oop, mtSymbol>)) {} | |
0 | 253 |
6197 | 254 StringTable(HashtableBucket<mtSymbol>* t, int number_of_entries) |
255 : Hashtable<oop, mtSymbol>((int)StringTableSize, sizeof (HashtableEntry<oop, mtSymbol>), t, | |
2378 | 256 number_of_entries) {} |
0 | 257 public: |
258 // The string table | |
259 static StringTable* the_table() { return _the_table; } | |
260 | |
261 static void create_table() { | |
262 assert(_the_table == NULL, "One string table allowed."); | |
263 _the_table = new StringTable(); | |
264 } | |
265 | |
6197 | 266 static void create_table(HashtableBucket<mtSymbol>* t, int length, |
0 | 267 int number_of_entries) { |
268 assert(_the_table == NULL, "One string table allowed."); | |
6197 | 269 assert((size_t)length == StringTableSize * sizeof(HashtableBucket<mtSymbol>), |
0 | 270 "bad shared string size."); |
271 _the_table = new StringTable(t, number_of_entries); | |
272 } | |
273 | |
274 // GC support | |
275 // Delete pointers to otherwise-unreachable objects. | |
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276 static void unlink(BoolObjectClosure* cl); |
0 | 277 |
278 // Invoke "f->do_oop" on the locations of all oops in the table. | |
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279 static void oops_do(OopClosure* f); |
0 | 280 |
6162 | 281 // Hashing algorithm, used as the hash value used by the |
282 // StringTable for bucket selection and comparison (stored in the | |
283 // HashtableEntry structures). This is used in the String.intern() method. | |
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284 static unsigned int hash_string(const jchar* s, int len); |
6162 | 285 |
286 // Internal test. | |
287 static void test_alt_hash() PRODUCT_RETURN; | |
288 | |
0 | 289 // Probing |
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290 static oop lookup(Symbol* symbol); |
0 | 291 |
292 // Interning | |
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293 static oop intern(Symbol* symbol, TRAPS); |
0 | 294 static oop intern(oop string, TRAPS); |
295 static oop intern(const char *utf8_string, TRAPS); | |
296 | |
297 // Debugging | |
298 static void verify(); | |
6162 | 299 static void dump(outputStream* st); |
0 | 300 |
301 // Sharing | |
302 static void copy_buckets(char** top, char*end) { | |
6197 | 303 the_table()->Hashtable<oop, mtSymbol>::copy_buckets(top, end); |
0 | 304 } |
305 static void copy_table(char** top, char*end) { | |
6197 | 306 the_table()->Hashtable<oop, mtSymbol>::copy_table(top, end); |
0 | 307 } |
308 static void reverse() { | |
6197 | 309 the_table()->Hashtable<oop, mtSymbol>::reverse(); |
0 | 310 } |
6162 | 311 |
312 // Rehash the symbol table if it gets out of balance | |
313 static void rehash_table(); | |
314 static bool needs_rehashing() { return _needs_rehashing; } | |
0 | 315 }; |
1972 | 316 #endif // SHARE_VM_CLASSFILE_SYMBOLTABLE_HPP |