Mercurial > hg > truffle
annotate src/share/vm/classfile/symbolTable.hpp @ 17677:51e1bb81df86 jdk8u20-b03
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author | amurillo |
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date | Tue, 25 Feb 2014 13:02:52 -0800 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, 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 //clear(); //FIXME |
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61 _temp = s._temp; |
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62 if (_temp !=NULL) _temp->increment_refcount(); |
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63 } |
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64 |
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65 // Decrement reference counter so it can go away if it's unique |
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66 void clear() { if (_temp != NULL) _temp->decrement_refcount(); _temp = NULL; } |
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67 |
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68 ~TempNewSymbol() { clear(); } |
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69 |
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70 // Operators so they can be used like Symbols |
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71 Symbol* operator -> () const { return _temp; } |
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72 bool operator == (Symbol* o) const { return _temp == o; } |
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73 // Sneaky conversion function |
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74 operator Symbol*() { return _temp; } |
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75 }; |
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76 |
6197 | 77 class SymbolTable : public Hashtable<Symbol*, mtSymbol> { |
0 | 78 friend class VMStructs; |
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79 friend class ClassFileParser; |
0 | 80 |
81 private: | |
82 // The symbol table | |
83 static SymbolTable* _the_table; | |
84 | |
6162 | 85 // Set if one bucket is out of balance due to hash algorithm deficiency |
86 static bool _needs_rehashing; | |
87 | |
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88 // For statistics |
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89 static int _symbols_removed; |
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90 static int _symbols_counted; |
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91 |
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92 Symbol* allocate_symbol(const u1* name, int len, bool c_heap, TRAPS); // Assumes no characters larger than 0x7F |
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93 |
0 | 94 // Adding elements |
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95 Symbol* basic_add(int index, u1* name, int len, unsigned int hashValue, |
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96 bool c_heap, TRAPS); |
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97 bool basic_add(ClassLoaderData* loader_data, |
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98 constantPoolHandle cp, int names_count, |
0 | 99 const char** names, int* lengths, int* cp_indices, |
100 unsigned int* hashValues, TRAPS); | |
101 | |
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102 static void new_symbols(ClassLoaderData* loader_data, |
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103 constantPoolHandle cp, int names_count, |
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104 const char** name, int* lengths, |
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105 int* cp_indices, unsigned int* hashValues, |
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106 TRAPS) { |
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107 add(loader_data, cp, names_count, name, lengths, cp_indices, hashValues, THREAD); |
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108 } |
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109 |
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110 Symbol* lookup(int index, const char* name, int len, unsigned int hash); |
0 | 111 |
112 SymbolTable() | |
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113 : Hashtable<Symbol*, mtSymbol>(SymbolTableSize, sizeof (HashtableEntry<Symbol*, mtSymbol>)) {} |
0 | 114 |
6197 | 115 SymbolTable(HashtableBucket<mtSymbol>* t, int number_of_entries) |
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116 : Hashtable<Symbol*, mtSymbol>(SymbolTableSize, sizeof (HashtableEntry<Symbol*, mtSymbol>), t, |
0 | 117 number_of_entries) {} |
118 | |
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119 // Arena for permanent symbols (null class loader) that are never unloaded |
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120 static Arena* _arena; |
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121 static Arena* arena() { return _arena; } // called for statistics |
0 | 122 |
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123 static void initialize_symbols(int arena_alloc_size = 0); |
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124 |
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125 static volatile int _parallel_claimed_idx; |
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126 |
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127 // Release any dead symbols |
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128 static void buckets_unlink(int start_idx, int end_idx, int* processed, int* removed, size_t* memory_total); |
0 | 129 public: |
130 enum { | |
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131 symbol_alloc_batch_size = 8, |
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132 // Pick initial size based on java -version size measurements |
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133 symbol_alloc_arena_size = 360*K |
0 | 134 }; |
135 | |
136 // The symbol table | |
137 static SymbolTable* the_table() { return _the_table; } | |
138 | |
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139 // Size of one bucket in the string table. Used when checking for rollover. |
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140 static uint bucket_size() { return sizeof(HashtableBucket<mtSymbol>); } |
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141 |
0 | 142 static void create_table() { |
143 assert(_the_table == NULL, "One symbol table allowed."); | |
144 _the_table = new SymbolTable(); | |
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145 initialize_symbols(symbol_alloc_arena_size); |
0 | 146 } |
147 | |
6197 | 148 static void create_table(HashtableBucket<mtSymbol>* t, int length, |
0 | 149 int number_of_entries) { |
150 assert(_the_table == NULL, "One symbol table allowed."); | |
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151 |
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152 // If CDS archive used a different symbol table size, use that size instead |
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153 // which is better than giving an error. |
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154 SymbolTableSize = length/bucket_size(); |
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155 |
0 | 156 _the_table = new SymbolTable(t, number_of_entries); |
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157 // if CDS give symbol table a default arena size since most symbols |
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158 // are already allocated in the shared misc section. |
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159 initialize_symbols(); |
0 | 160 } |
161 | |
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162 static unsigned int hash_symbol(const char* s, int len); |
6162 | 163 |
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164 static Symbol* lookup(const char* name, int len, TRAPS); |
0 | 165 // lookup only, won't add. Also calculate hash. |
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166 static Symbol* lookup_only(const char* name, int len, unsigned int& hash); |
0 | 167 // Only copy to C string to be added if lookup failed. |
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168 static Symbol* lookup(const Symbol* sym, int begin, int end, TRAPS); |
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169 |
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170 static void release(Symbol* sym); |
0 | 171 |
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172 // Look up the address of the literal in the SymbolTable for this Symbol* |
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173 static Symbol** lookup_symbol_addr(Symbol* sym); |
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174 |
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175 // jchar (utf16) version of lookups |
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176 static Symbol* lookup_unicode(const jchar* name, int len, TRAPS); |
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177 static Symbol* lookup_only_unicode(const jchar* name, int len, unsigned int& hash); |
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178 |
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179 static void add(ClassLoaderData* loader_data, |
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180 constantPoolHandle cp, int names_count, |
0 | 181 const char** names, int* lengths, int* cp_indices, |
182 unsigned int* hashValues, TRAPS); | |
183 | |
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184 // Release any dead symbols |
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185 static void unlink() { |
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186 int processed = 0; |
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187 int removed = 0; |
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188 unlink(&processed, &removed); |
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189 } |
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190 static void unlink(int* processed, int* removed); |
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191 // Release any dead symbols, possibly parallel version |
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192 static void possibly_parallel_unlink(int* processed, int* removed); |
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193 |
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194 // iterate over symbols |
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195 static void symbols_do(SymbolClosure *cl); |
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196 |
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197 // Symbol creation |
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198 static Symbol* new_symbol(const char* utf8_buffer, int length, TRAPS) { |
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199 assert(utf8_buffer != NULL, "just checking"); |
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200 return lookup(utf8_buffer, length, THREAD); |
0 | 201 } |
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202 static Symbol* new_symbol(const char* name, TRAPS) { |
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203 return new_symbol(name, (int)strlen(name), THREAD); |
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204 } |
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205 static Symbol* new_symbol(const Symbol* sym, int begin, int end, TRAPS) { |
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206 assert(begin <= end && end <= sym->utf8_length(), "just checking"); |
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207 return lookup(sym, begin, end, THREAD); |
0 | 208 } |
209 | |
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210 // Create a symbol in the arena for symbols that are not deleted |
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211 static Symbol* new_permanent_symbol(const char* name, TRAPS); |
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212 |
0 | 213 // Symbol lookup |
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214 static Symbol* lookup(int index, const char* name, int len, TRAPS); |
0 | 215 |
216 // Needed for preloading classes in signatures when compiling. | |
217 // Returns the symbol is already present in symbol table, otherwise | |
218 // NULL. NO ALLOCATION IS GUARANTEED! | |
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219 static Symbol* probe(const char* name, int len) { |
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220 unsigned int ignore_hash; |
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221 return lookup_only(name, len, ignore_hash); |
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222 } |
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223 static Symbol* probe_unicode(const jchar* name, int len) { |
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224 unsigned int ignore_hash; |
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225 return lookup_only_unicode(name, len, ignore_hash); |
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226 } |
0 | 227 |
228 // Histogram | |
229 static void print_histogram() PRODUCT_RETURN; | |
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230 static void print() PRODUCT_RETURN; |
0 | 231 |
232 // Debugging | |
233 static void verify(); | |
6162 | 234 static void dump(outputStream* st); |
0 | 235 |
236 // Sharing | |
237 static void copy_buckets(char** top, char*end) { | |
6197 | 238 the_table()->Hashtable<Symbol*, mtSymbol>::copy_buckets(top, end); |
0 | 239 } |
240 static void copy_table(char** top, char*end) { | |
6197 | 241 the_table()->Hashtable<Symbol*, mtSymbol>::copy_table(top, end); |
0 | 242 } |
243 static void reverse(void* boundary = NULL) { | |
6197 | 244 the_table()->Hashtable<Symbol*, mtSymbol>::reverse(boundary); |
0 | 245 } |
6162 | 246 |
247 // Rehash the symbol table if it gets out of balance | |
248 static void rehash_table(); | |
249 static bool needs_rehashing() { return _needs_rehashing; } | |
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250 // Parallel chunked scanning |
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251 static void clear_parallel_claimed_index() { _parallel_claimed_idx = 0; } |
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252 static int parallel_claimed_index() { return _parallel_claimed_idx; } |
0 | 253 }; |
254 | |
6197 | 255 class StringTable : public Hashtable<oop, mtSymbol> { |
0 | 256 friend class VMStructs; |
257 | |
258 private: | |
259 // The string table | |
260 static StringTable* _the_table; | |
261 | |
6162 | 262 // Set if one bucket is out of balance due to hash algorithm deficiency |
263 static bool _needs_rehashing; | |
264 | |
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265 // Claimed high water mark for parallel chunked scanning |
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266 static volatile int _parallel_claimed_idx; |
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267 |
0 | 268 static oop intern(Handle string_or_null, jchar* chars, int length, TRAPS); |
269 oop basic_add(int index, Handle string_or_null, jchar* name, int len, | |
270 unsigned int hashValue, TRAPS); | |
271 | |
272 oop lookup(int index, jchar* chars, int length, unsigned int hashValue); | |
273 | |
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274 // Apply the give oop closure to the entries to the buckets |
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275 // in the range [start_idx, end_idx). |
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276 static void buckets_oops_do(OopClosure* f, int start_idx, int end_idx); |
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277 // Unlink or apply the give oop closure to the entries to the buckets |
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278 // in the range [start_idx, end_idx). |
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279 static void buckets_unlink_or_oops_do(BoolObjectClosure* is_alive, OopClosure* f, int start_idx, int end_idx, int* processed, int* removed); |
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280 |
6197 | 281 StringTable() : Hashtable<oop, mtSymbol>((int)StringTableSize, |
282 sizeof (HashtableEntry<oop, mtSymbol>)) {} | |
0 | 283 |
6197 | 284 StringTable(HashtableBucket<mtSymbol>* t, int number_of_entries) |
285 : Hashtable<oop, mtSymbol>((int)StringTableSize, sizeof (HashtableEntry<oop, mtSymbol>), t, | |
2378 | 286 number_of_entries) {} |
0 | 287 public: |
288 // The string table | |
289 static StringTable* the_table() { return _the_table; } | |
290 | |
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291 // Size of one bucket in the string table. Used when checking for rollover. |
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292 static uint bucket_size() { return sizeof(HashtableBucket<mtSymbol>); } |
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293 |
0 | 294 static void create_table() { |
295 assert(_the_table == NULL, "One string table allowed."); | |
296 _the_table = new StringTable(); | |
297 } | |
298 | |
299 // GC support | |
300 // Delete pointers to otherwise-unreachable objects. | |
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301 static void unlink_or_oops_do(BoolObjectClosure* cl, OopClosure* f) { |
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302 int processed = 0; |
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303 int removed = 0; |
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304 unlink_or_oops_do(cl, f, &processed, &removed); |
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305 } |
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306 static void unlink(BoolObjectClosure* cl) { |
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307 int processed = 0; |
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308 int removed = 0; |
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309 unlink_or_oops_do(cl, NULL, &processed, &removed); |
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310 } |
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311 static void unlink_or_oops_do(BoolObjectClosure* cl, OopClosure* f, int* processed, int* removed); |
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312 static void unlink(BoolObjectClosure* cl, int* processed, int* removed) { |
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313 unlink_or_oops_do(cl, NULL, processed, removed); |
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314 } |
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315 // Serially invoke "f->do_oop" on the locations of all oops in the table. |
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316 static void oops_do(OopClosure* f); |
0 | 317 |
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318 // Possibly parallel versions of the above |
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319 static void possibly_parallel_unlink_or_oops_do(BoolObjectClosure* cl, OopClosure* f, int* processed, int* removed); |
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320 static void possibly_parallel_unlink(BoolObjectClosure* cl, int* processed, int* removed) { |
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321 possibly_parallel_unlink_or_oops_do(cl, NULL, processed, removed); |
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322 } |
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323 static void possibly_parallel_oops_do(OopClosure* f); |
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324 |
6162 | 325 // Hashing algorithm, used as the hash value used by the |
326 // StringTable for bucket selection and comparison (stored in the | |
327 // HashtableEntry structures). This is used in the String.intern() method. | |
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328 static unsigned int hash_string(const jchar* s, int len); |
6162 | 329 |
330 // Internal test. | |
331 static void test_alt_hash() PRODUCT_RETURN; | |
332 | |
0 | 333 // Probing |
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334 static oop lookup(Symbol* symbol); |
8850 | 335 static oop lookup(jchar* chars, int length); |
0 | 336 |
337 // Interning | |
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338 static oop intern(Symbol* symbol, TRAPS); |
0 | 339 static oop intern(oop string, TRAPS); |
340 static oop intern(const char *utf8_string, TRAPS); | |
341 | |
342 // Debugging | |
343 static void verify(); | |
6162 | 344 static void dump(outputStream* st); |
0 | 345 |
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346 enum VerifyMesgModes { |
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347 _verify_quietly = 0, |
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348 _verify_with_mesgs = 1 |
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349 }; |
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350 |
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351 enum VerifyRetTypes { |
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352 _verify_pass = 0, |
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353 _verify_fail_continue = 1, |
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354 _verify_fail_done = 2 |
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355 }; |
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356 |
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357 static VerifyRetTypes compare_entries(int bkt1, int e_cnt1, |
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358 HashtableEntry<oop, mtSymbol>* e_ptr1, |
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359 int bkt2, int e_cnt2, |
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360 HashtableEntry<oop, mtSymbol>* e_ptr2); |
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361 static VerifyRetTypes verify_entry(int bkt, int e_cnt, |
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362 HashtableEntry<oop, mtSymbol>* e_ptr, |
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363 VerifyMesgModes mesg_mode); |
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364 static int verify_and_compare_entries(); |
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365 |
0 | 366 // Sharing |
367 static void copy_buckets(char** top, char*end) { | |
6197 | 368 the_table()->Hashtable<oop, mtSymbol>::copy_buckets(top, end); |
0 | 369 } |
370 static void copy_table(char** top, char*end) { | |
6197 | 371 the_table()->Hashtable<oop, mtSymbol>::copy_table(top, end); |
0 | 372 } |
373 static void reverse() { | |
6197 | 374 the_table()->Hashtable<oop, mtSymbol>::reverse(); |
0 | 375 } |
6162 | 376 |
377 // Rehash the symbol table if it gets out of balance | |
378 static void rehash_table(); | |
379 static bool needs_rehashing() { return _needs_rehashing; } | |
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380 |
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381 // Parallel chunked scanning |
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382 static void clear_parallel_claimed_index() { _parallel_claimed_idx = 0; } |
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383 static int parallel_claimed_index() { return _parallel_claimed_idx; } |
0 | 384 }; |
1972 | 385 #endif // SHARE_VM_CLASSFILE_SYMBOLTABLE_HPP |