Mercurial > hg > truffle
annotate src/share/vm/classfile/symbolTable.hpp @ 4988:eb5b24d1499f
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author | Christian Haeubl <christian.haeubl@oracle.com> |
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date | Mon, 27 Feb 2012 15:06:36 -0800 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2011, 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, TRAPS); // Assumes no characters larger than 0x7F |
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86 bool allocate_symbols(int names_count, const u1** names, int* lengths, Symbol** syms, TRAPS); |
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87 |
0 | 88 // Adding elements |
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89 Symbol* basic_add(int index, u1* name, int len, |
0 | 90 unsigned int hashValue, TRAPS); |
91 bool basic_add(constantPoolHandle cp, int names_count, | |
92 const char** names, int* lengths, int* cp_indices, | |
93 unsigned int* hashValues, TRAPS); | |
94 | |
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95 static void new_symbols(constantPoolHandle cp, int names_count, |
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96 const char** name, int* lengths, |
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97 int* cp_indices, unsigned int* hashValues, |
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98 TRAPS) { |
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99 add(cp, names_count, name, lengths, cp_indices, hashValues, THREAD); |
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100 } |
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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 | |
117 | |
118 public: | |
119 enum { | |
120 symbol_alloc_batch_size = 8 | |
121 }; | |
122 | |
123 // The symbol table | |
124 static SymbolTable* the_table() { return _the_table; } | |
125 | |
126 static void create_table() { | |
127 assert(_the_table == NULL, "One symbol table allowed."); | |
128 _the_table = new SymbolTable(); | |
129 } | |
130 | |
131 static void create_table(HashtableBucket* t, int length, | |
132 int number_of_entries) { | |
133 assert(_the_table == NULL, "One symbol table allowed."); | |
134 assert(length == symbol_table_size * sizeof(HashtableBucket), | |
135 "bad shared symbol size."); | |
136 _the_table = new SymbolTable(t, number_of_entries); | |
137 } | |
138 | |
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139 static Symbol* lookup(const char* name, int len, TRAPS); |
0 | 140 // lookup only, won't add. Also calculate hash. |
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141 static Symbol* lookup_only(const char* name, int len, unsigned int& hash); |
0 | 142 // Only copy to C string to be added if lookup failed. |
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143 static Symbol* lookup(const Symbol* sym, int begin, int end, TRAPS); |
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144 |
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145 static void release(Symbol* sym); |
0 | 146 |
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147 // Look up the address of the literal in the SymbolTable for this Symbol* |
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148 static Symbol** lookup_symbol_addr(Symbol* sym); |
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149 |
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150 // jchar (utf16) version of lookups |
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151 static Symbol* lookup_unicode(const jchar* name, int len, TRAPS); |
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152 static Symbol* lookup_only_unicode(const jchar* name, int len, unsigned int& hash); |
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153 |
0 | 154 static void add(constantPoolHandle cp, int names_count, |
155 const char** names, int* lengths, int* cp_indices, | |
156 unsigned int* hashValues, TRAPS); | |
157 | |
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158 // Release any dead symbols |
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159 static void unlink(); |
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160 |
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161 // iterate over symbols |
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162 static void symbols_do(SymbolClosure *cl); |
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163 |
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164 // Symbol creation |
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165 static Symbol* new_symbol(const char* utf8_buffer, int length, TRAPS) { |
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166 assert(utf8_buffer != NULL, "just checking"); |
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167 return lookup(utf8_buffer, length, THREAD); |
0 | 168 } |
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169 static Symbol* new_symbol(const char* name, TRAPS) { |
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170 return new_symbol(name, (int)strlen(name), THREAD); |
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171 } |
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172 static Symbol* new_symbol(const Symbol* sym, int begin, int end, TRAPS) { |
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173 assert(begin <= end && end <= sym->utf8_length(), "just checking"); |
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174 return lookup(sym, begin, end, THREAD); |
0 | 175 } |
176 | |
177 // Symbol lookup | |
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178 static Symbol* lookup(int index, const char* name, int len, TRAPS); |
0 | 179 |
180 // Needed for preloading classes in signatures when compiling. | |
181 // Returns the symbol is already present in symbol table, otherwise | |
182 // NULL. NO ALLOCATION IS GUARANTEED! | |
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183 static Symbol* probe(const char* name, int len) { |
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184 unsigned int ignore_hash; |
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185 return lookup_only(name, len, ignore_hash); |
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186 } |
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187 static Symbol* probe_unicode(const jchar* name, int len) { |
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188 unsigned int ignore_hash; |
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189 return lookup_only_unicode(name, len, ignore_hash); |
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190 } |
0 | 191 |
192 // Histogram | |
193 static void print_histogram() PRODUCT_RETURN; | |
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194 static void print() PRODUCT_RETURN; |
0 | 195 |
196 // Debugging | |
197 static void verify(); | |
198 | |
199 // Sharing | |
200 static void copy_buckets(char** top, char*end) { | |
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201 the_table()->Hashtable<Symbol*>::copy_buckets(top, end); |
0 | 202 } |
203 static void copy_table(char** top, char*end) { | |
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204 the_table()->Hashtable<Symbol*>::copy_table(top, end); |
0 | 205 } |
206 static void reverse(void* boundary = NULL) { | |
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207 the_table()->Hashtable<Symbol*>::reverse(boundary); |
0 | 208 } |
209 }; | |
210 | |
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211 class StringTable : public Hashtable<oop> { |
0 | 212 friend class VMStructs; |
213 | |
214 private: | |
215 // The string table | |
216 static StringTable* _the_table; | |
217 | |
218 static oop intern(Handle string_or_null, jchar* chars, int length, TRAPS); | |
219 oop basic_add(int index, Handle string_or_null, jchar* name, int len, | |
220 unsigned int hashValue, TRAPS); | |
221 | |
222 oop lookup(int index, jchar* chars, int length, unsigned int hashValue); | |
223 | |
2378 | 224 StringTable() : Hashtable<oop>((int)StringTableSize, |
225 sizeof (HashtableEntry<oop>)) {} | |
0 | 226 |
227 StringTable(HashtableBucket* t, int number_of_entries) | |
2378 | 228 : Hashtable<oop>((int)StringTableSize, sizeof (HashtableEntry<oop>), t, |
229 number_of_entries) {} | |
0 | 230 |
231 public: | |
232 // The string table | |
233 static StringTable* the_table() { return _the_table; } | |
234 | |
235 static void create_table() { | |
236 assert(_the_table == NULL, "One string table allowed."); | |
237 _the_table = new StringTable(); | |
238 } | |
239 | |
240 static void create_table(HashtableBucket* t, int length, | |
241 int number_of_entries) { | |
242 assert(_the_table == NULL, "One string table allowed."); | |
2378 | 243 assert((size_t)length == StringTableSize * sizeof(HashtableBucket), |
0 | 244 "bad shared string size."); |
245 _the_table = new StringTable(t, number_of_entries); | |
246 } | |
247 | |
248 // GC support | |
249 // Delete pointers to otherwise-unreachable objects. | |
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250 static void unlink(BoolObjectClosure* cl); |
0 | 251 |
252 // Invoke "f->do_oop" on the locations of all oops in the table. | |
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253 static void oops_do(OopClosure* f); |
0 | 254 |
255 // Probing | |
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256 static oop lookup(Symbol* symbol); |
0 | 257 |
258 // Interning | |
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259 static oop intern(Symbol* symbol, TRAPS); |
0 | 260 static oop intern(oop string, TRAPS); |
261 static oop intern(const char *utf8_string, TRAPS); | |
262 | |
263 // Debugging | |
264 static void verify(); | |
265 | |
266 // Sharing | |
267 static void copy_buckets(char** top, char*end) { | |
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268 the_table()->Hashtable<oop>::copy_buckets(top, end); |
0 | 269 } |
270 static void copy_table(char** top, char*end) { | |
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271 the_table()->Hashtable<oop>::copy_table(top, end); |
0 | 272 } |
273 static void reverse() { | |
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274 the_table()->Hashtable<oop>::reverse(); |
0 | 275 } |
276 }; | |
1972 | 277 |
278 #endif // SHARE_VM_CLASSFILE_SYMBOLTABLE_HPP |