Mercurial > hg > truffle
annotate src/share/vm/classfile/symbolTable.hpp @ 6027:8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
Summary: Removed the HeapRegion::_top_at_conc_mark_count field. It is no longer needed as a result of the changes for 6888336 and 7127706. Refactored the closures that finalize and verify the liveness counting data so that common functionality was placed into a base class.
Reviewed-by: brutisso, tonyp
author | johnc |
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date | Wed, 25 Apr 2012 10:23:12 -0700 |
parents | fc9d8850ab8b |
children | e9140bf80b4a |
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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; | |
43 | |
44 | |
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45 // Class to hold a newly created or referenced Symbol* temporarily in scope. |
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46 // new_symbol() and lookup() will create a Symbol* if not already in the |
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47 // symbol table and add to the symbol's reference count. |
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48 // probe() and lookup_only() will increment the refcount if symbol is found. |
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49 class TempNewSymbol : public StackObj { |
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50 Symbol* _temp; |
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51 |
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52 public: |
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53 TempNewSymbol() : _temp(NULL) {} |
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54 // Creating or looking up a symbol increments the symbol's reference count |
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55 TempNewSymbol(Symbol *s) : _temp(s) {} |
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56 |
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57 // Operator= increments reference count. |
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58 void operator=(const TempNewSymbol &s) { |
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59 _temp = s._temp; |
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60 if (_temp !=NULL) _temp->increment_refcount(); |
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61 } |
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62 |
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63 // Decrement reference counter so it can go away if it's unique |
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64 ~TempNewSymbol() { if (_temp != NULL) _temp->decrement_refcount(); } |
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65 |
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66 // Operators so they can be used like Symbols |
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67 Symbol* operator -> () const { return _temp; } |
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68 bool operator == (Symbol* o) const { return _temp == o; } |
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69 // Sneaky conversion function |
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70 operator Symbol*() { return _temp; } |
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71 }; |
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72 |
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73 class SymbolTable : public Hashtable<Symbol*> { |
0 | 74 friend class VMStructs; |
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75 friend class ClassFileParser; |
0 | 76 |
77 private: | |
78 // The symbol table | |
79 static SymbolTable* _the_table; | |
80 | |
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81 // For statistics |
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82 static int symbols_removed; |
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83 static int symbols_counted; |
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84 |
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85 Symbol* allocate_symbol(const u1* name, int len, bool c_heap, TRAPS); // Assumes no characters larger than 0x7F |
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86 |
0 | 87 // Adding elements |
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88 Symbol* basic_add(int index, u1* name, int len, unsigned int hashValue, |
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89 bool c_heap, TRAPS); |
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90 |
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91 bool basic_add(Handle class_loader, constantPoolHandle cp, int names_count, |
0 | 92 const char** names, int* lengths, int* cp_indices, |
93 unsigned int* hashValues, TRAPS); | |
94 | |
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95 static void new_symbols(Handle class_loader, constantPoolHandle cp, |
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96 int names_count, |
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97 const char** name, int* lengths, |
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98 int* cp_indices, unsigned int* hashValues, |
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99 TRAPS) { |
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100 add(class_loader, cp, names_count, name, lengths, cp_indices, hashValues, THREAD); |
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101 } |
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102 |
0 | 103 // Table size |
104 enum { | |
105 symbol_table_size = 20011 | |
106 }; | |
107 | |
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108 Symbol* lookup(int index, const char* name, int len, unsigned int hash); |
0 | 109 |
110 SymbolTable() | |
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111 : Hashtable<Symbol*>(symbol_table_size, sizeof (HashtableEntry<Symbol*>)) {} |
0 | 112 |
113 SymbolTable(HashtableBucket* t, int number_of_entries) | |
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114 : Hashtable<Symbol*>(symbol_table_size, sizeof (HashtableEntry<Symbol*>), t, |
0 | 115 number_of_entries) {} |
116 | |
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117 // Arena for permanent symbols (null class loader) that are never unloaded |
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118 static Arena* _arena; |
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119 static Arena* arena() { return _arena; } // called for statistics |
0 | 120 |
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121 static void initialize_symbols(int arena_alloc_size = 0); |
0 | 122 public: |
123 enum { | |
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124 symbol_alloc_batch_size = 8, |
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125 // Pick initial size based on java -version size measurements |
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126 symbol_alloc_arena_size = 360*K |
0 | 127 }; |
128 | |
129 // The symbol table | |
130 static SymbolTable* the_table() { return _the_table; } | |
131 | |
132 static void create_table() { | |
133 assert(_the_table == NULL, "One symbol table allowed."); | |
134 _the_table = new SymbolTable(); | |
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135 initialize_symbols(symbol_alloc_arena_size); |
0 | 136 } |
137 | |
138 static void create_table(HashtableBucket* t, int length, | |
139 int number_of_entries) { | |
140 assert(_the_table == NULL, "One symbol table allowed."); | |
141 assert(length == symbol_table_size * sizeof(HashtableBucket), | |
142 "bad shared symbol size."); | |
143 _the_table = new SymbolTable(t, number_of_entries); | |
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144 // if CDS give symbol table a default arena size since most symbols |
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145 // are already allocated in the shared misc section. |
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146 initialize_symbols(); |
0 | 147 } |
148 | |
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149 static Symbol* lookup(const char* name, int len, TRAPS); |
0 | 150 // lookup only, won't add. Also calculate hash. |
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151 static Symbol* lookup_only(const char* name, int len, unsigned int& hash); |
0 | 152 // Only copy to C string to be added if lookup failed. |
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153 static Symbol* lookup(const Symbol* sym, int begin, int end, TRAPS); |
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154 |
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155 static void release(Symbol* sym); |
0 | 156 |
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157 // Look up the address of the literal in the SymbolTable for this Symbol* |
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158 static Symbol** lookup_symbol_addr(Symbol* sym); |
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159 |
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160 // jchar (utf16) version of lookups |
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161 static Symbol* lookup_unicode(const jchar* name, int len, TRAPS); |
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162 static Symbol* lookup_only_unicode(const jchar* name, int len, unsigned int& hash); |
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163 |
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164 static void add(Handle class_loader, constantPoolHandle cp, int names_count, |
0 | 165 const char** names, int* lengths, int* cp_indices, |
166 unsigned int* hashValues, TRAPS); | |
167 | |
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168 // Release any dead symbols |
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169 static void unlink(); |
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170 |
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171 // iterate over symbols |
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172 static void symbols_do(SymbolClosure *cl); |
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173 |
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174 // Symbol creation |
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175 static Symbol* new_symbol(const char* utf8_buffer, int length, TRAPS) { |
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176 assert(utf8_buffer != NULL, "just checking"); |
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177 return lookup(utf8_buffer, length, THREAD); |
0 | 178 } |
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179 static Symbol* new_symbol(const char* name, TRAPS) { |
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180 return new_symbol(name, (int)strlen(name), THREAD); |
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181 } |
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182 static Symbol* new_symbol(const Symbol* sym, int begin, int end, TRAPS) { |
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183 assert(begin <= end && end <= sym->utf8_length(), "just checking"); |
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184 return lookup(sym, begin, end, THREAD); |
0 | 185 } |
186 | |
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187 // Create a symbol in the arena for symbols that are not deleted |
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188 static Symbol* new_permanent_symbol(const char* name, TRAPS); |
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189 |
0 | 190 // Symbol lookup |
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191 static Symbol* lookup(int index, const char* name, int len, TRAPS); |
0 | 192 |
193 // Needed for preloading classes in signatures when compiling. | |
194 // Returns the symbol is already present in symbol table, otherwise | |
195 // NULL. NO ALLOCATION IS GUARANTEED! | |
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196 static Symbol* probe(const char* name, int len) { |
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197 unsigned int ignore_hash; |
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198 return lookup_only(name, len, ignore_hash); |
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199 } |
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200 static Symbol* probe_unicode(const jchar* name, int len) { |
665
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201 unsigned int ignore_hash; |
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202 return lookup_only_unicode(name, len, ignore_hash); |
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203 } |
0 | 204 |
205 // Histogram | |
206 static void print_histogram() PRODUCT_RETURN; | |
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207 static void print() PRODUCT_RETURN; |
0 | 208 |
209 // Debugging | |
210 static void verify(); | |
211 | |
212 // Sharing | |
213 static void copy_buckets(char** top, char*end) { | |
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214 the_table()->Hashtable<Symbol*>::copy_buckets(top, end); |
0 | 215 } |
216 static void copy_table(char** top, char*end) { | |
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217 the_table()->Hashtable<Symbol*>::copy_table(top, end); |
0 | 218 } |
219 static void reverse(void* boundary = NULL) { | |
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220 the_table()->Hashtable<Symbol*>::reverse(boundary); |
0 | 221 } |
222 }; | |
223 | |
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224 class StringTable : public Hashtable<oop> { |
0 | 225 friend class VMStructs; |
226 | |
227 private: | |
228 // The string table | |
229 static StringTable* _the_table; | |
230 | |
231 static oop intern(Handle string_or_null, jchar* chars, int length, TRAPS); | |
232 oop basic_add(int index, Handle string_or_null, jchar* name, int len, | |
233 unsigned int hashValue, TRAPS); | |
234 | |
235 oop lookup(int index, jchar* chars, int length, unsigned int hashValue); | |
236 | |
2378 | 237 StringTable() : Hashtable<oop>((int)StringTableSize, |
238 sizeof (HashtableEntry<oop>)) {} | |
0 | 239 |
240 StringTable(HashtableBucket* t, int number_of_entries) | |
2378 | 241 : Hashtable<oop>((int)StringTableSize, sizeof (HashtableEntry<oop>), t, |
242 number_of_entries) {} | |
0 | 243 |
244 public: | |
245 // The string table | |
246 static StringTable* the_table() { return _the_table; } | |
247 | |
248 static void create_table() { | |
249 assert(_the_table == NULL, "One string table allowed."); | |
250 _the_table = new StringTable(); | |
251 } | |
252 | |
253 static void create_table(HashtableBucket* t, int length, | |
254 int number_of_entries) { | |
255 assert(_the_table == NULL, "One string table allowed."); | |
2378 | 256 assert((size_t)length == StringTableSize * sizeof(HashtableBucket), |
0 | 257 "bad shared string size."); |
258 _the_table = new StringTable(t, number_of_entries); | |
259 } | |
260 | |
261 // GC support | |
262 // Delete pointers to otherwise-unreachable objects. | |
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263 static void unlink(BoolObjectClosure* cl); |
0 | 264 |
265 // Invoke "f->do_oop" on the locations of all oops in the table. | |
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266 static void oops_do(OopClosure* f); |
0 | 267 |
268 // Probing | |
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269 static oop lookup(Symbol* symbol); |
0 | 270 |
271 // Interning | |
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272 static oop intern(Symbol* symbol, TRAPS); |
0 | 273 static oop intern(oop string, TRAPS); |
274 static oop intern(const char *utf8_string, TRAPS); | |
275 | |
276 // Debugging | |
277 static void verify(); | |
278 | |
279 // Sharing | |
280 static void copy_buckets(char** top, char*end) { | |
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281 the_table()->Hashtable<oop>::copy_buckets(top, end); |
0 | 282 } |
283 static void copy_table(char** top, char*end) { | |
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284 the_table()->Hashtable<oop>::copy_table(top, end); |
0 | 285 } |
286 static void reverse() { | |
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287 the_table()->Hashtable<oop>::reverse(); |
0 | 288 } |
289 }; | |
1972 | 290 |
291 #endif // SHARE_VM_CLASSFILE_SYMBOLTABLE_HPP |