Mercurial > hg > truffle
annotate src/share/vm/classfile/symbolTable.cpp @ 9153:bc63dd2539a4
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author | kvn |
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date | Fri, 12 Apr 2013 20:37:18 -0400 |
parents | ede380e13960 |
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rev | line source |
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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 #include "precompiled.hpp" |
6162 | 26 #include "classfile/altHashing.hpp" |
1972 | 27 #include "classfile/javaClasses.hpp" |
28 #include "classfile/symbolTable.hpp" | |
29 #include "classfile/systemDictionary.hpp" | |
30 #include "gc_interface/collectedHeap.inline.hpp" | |
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31 #include "memory/allocation.inline.hpp" |
1972 | 32 #include "memory/filemap.hpp" |
33 #include "memory/gcLocker.inline.hpp" | |
34 #include "oops/oop.inline.hpp" | |
35 #include "oops/oop.inline2.hpp" | |
36 #include "runtime/mutexLocker.hpp" | |
37 #include "utilities/hashtable.inline.hpp" | |
6162 | 38 #include "utilities/numberSeq.hpp" |
0 | 39 |
40 // -------------------------------------------------------------------------- | |
41 | |
42 SymbolTable* SymbolTable::_the_table = NULL; | |
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43 // Static arena for symbols that are not deallocated |
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44 Arena* SymbolTable::_arena = NULL; |
6162 | 45 bool SymbolTable::_needs_rehashing = false; |
0 | 46 |
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47 Symbol* SymbolTable::allocate_symbol(const u1* name, int len, bool c_heap, TRAPS) { |
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48 assert (len <= Symbol::max_length(), "should be checked by caller"); |
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49 |
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50 Symbol* sym; |
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51 |
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52 if (DumpSharedSpaces) { |
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53 // Allocate all symbols to CLD shared metaspace |
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54 sym = new (len, ClassLoaderData::the_null_class_loader_data(), THREAD) Symbol(name, len, -1); |
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55 } else if (c_heap) { |
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56 // refcount starts as 1 |
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57 sym = new (len, THREAD) Symbol(name, len, 1); |
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58 assert(sym != NULL, "new should call vm_exit_out_of_memory if C_HEAP is exhausted"); |
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59 } else { |
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60 // Allocate to global arena |
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61 sym = new (len, arena(), THREAD) Symbol(name, len, -1); |
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62 } |
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63 return sym; |
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64 } |
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65 |
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66 void SymbolTable::initialize_symbols(int arena_alloc_size) { |
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67 // Initialize the arena for global symbols, size passed in depends on CDS. |
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68 if (arena_alloc_size == 0) { |
6197 | 69 _arena = new (mtSymbol) Arena(); |
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70 } else { |
6197 | 71 _arena = new (mtSymbol) Arena(arena_alloc_size); |
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72 } |
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73 } |
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74 |
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75 // Call function for all symbols in the symbol table. |
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76 void SymbolTable::symbols_do(SymbolClosure *cl) { |
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77 const int n = the_table()->table_size(); |
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78 for (int i = 0; i < n; i++) { |
6197 | 79 for (HashtableEntry<Symbol*, mtSymbol>* p = the_table()->bucket(i); |
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80 p != NULL; |
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81 p = p->next()) { |
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82 cl->do_symbol(p->literal_addr()); |
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83 } |
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84 } |
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85 } |
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86 |
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87 int SymbolTable::symbols_removed = 0; |
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88 int SymbolTable::symbols_counted = 0; |
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89 |
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90 // Remove unreferenced symbols from the symbol table |
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91 // This is done late during GC. |
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92 void SymbolTable::unlink() { |
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93 int removed = 0; |
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94 int total = 0; |
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95 size_t memory_total = 0; |
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96 for (int i = 0; i < the_table()->table_size(); ++i) { |
6197 | 97 HashtableEntry<Symbol*, mtSymbol>** p = the_table()->bucket_addr(i); |
98 HashtableEntry<Symbol*, mtSymbol>* entry = the_table()->bucket(i); | |
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99 while (entry != NULL) { |
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100 // Shared entries are normally at the end of the bucket and if we run into |
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101 // a shared entry, then there is nothing more to remove. However, if we |
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102 // have rehashed the table, then the shared entries are no longer at the |
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103 // end of the bucket. |
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104 if (entry->is_shared() && !use_alternate_hashcode()) { |
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105 break; |
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106 } |
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107 Symbol* s = entry->literal(); |
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108 memory_total += s->size(); |
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109 total++; |
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110 assert(s != NULL, "just checking"); |
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111 // If reference count is zero, remove. |
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112 if (s->refcount() == 0) { |
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113 assert(!entry->is_shared(), "shared entries should be kept live"); |
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114 delete s; |
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115 removed++; |
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116 *p = entry->next(); |
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117 the_table()->free_entry(entry); |
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118 } else { |
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119 p = entry->next_addr(); |
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120 } |
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121 // get next entry |
6197 | 122 entry = (HashtableEntry<Symbol*, mtSymbol>*)HashtableEntry<Symbol*, mtSymbol>::make_ptr(*p); |
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123 } |
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124 } |
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125 symbols_removed += removed; |
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126 symbols_counted += total; |
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127 // Exclude printing for normal PrintGCDetails because people parse |
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128 // this output. |
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129 if (PrintGCDetails && Verbose && WizardMode) { |
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130 gclog_or_tty->print(" [Symbols=%d size=" SIZE_FORMAT "K] ", total, |
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131 (memory_total*HeapWordSize)/1024); |
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132 } |
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133 } |
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134 |
6162 | 135 // Create a new table and using alternate hash code, populate the new table |
136 // with the existing strings. Set flag to use the alternate hash code afterwards. | |
137 void SymbolTable::rehash_table() { | |
138 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
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139 // This should never happen with -Xshare:dump but it might in testing mode. |
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140 if (DumpSharedSpaces) return; |
6162 | 141 // Create a new symbol table |
142 SymbolTable* new_table = new SymbolTable(); | |
143 | |
144 the_table()->move_to(new_table); | |
145 | |
146 // Delete the table and buckets (entries are reused in new table). | |
147 delete _the_table; | |
148 // Don't check if we need rehashing until the table gets unbalanced again. | |
149 // Then rehash with a new global seed. | |
150 _needs_rehashing = false; | |
151 _the_table = new_table; | |
152 } | |
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153 |
0 | 154 // Lookup a symbol in a bucket. |
155 | |
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156 Symbol* SymbolTable::lookup(int index, const char* name, |
0 | 157 int len, unsigned int hash) { |
6162 | 158 int count = 0; |
6197 | 159 for (HashtableEntry<Symbol*, mtSymbol>* e = bucket(index); e != NULL; e = e->next()) { |
6162 | 160 count++; // count all entries in this bucket, not just ones with same hash |
0 | 161 if (e->hash() == hash) { |
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162 Symbol* sym = e->literal(); |
0 | 163 if (sym->equals(name, len)) { |
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164 // something is referencing this symbol now. |
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165 sym->increment_refcount(); |
0 | 166 return sym; |
167 } | |
168 } | |
169 } | |
6162 | 170 // If the bucket size is too deep check if this hash code is insufficient. |
6197 | 171 if (count >= BasicHashtable<mtSymbol>::rehash_count && !needs_rehashing()) { |
6162 | 172 _needs_rehashing = check_rehash_table(count); |
173 } | |
0 | 174 return NULL; |
175 } | |
176 | |
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177 // Pick hashing algorithm. |
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178 unsigned int SymbolTable::hash_symbol(const char* s, int len) { |
6162 | 179 return use_alternate_hashcode() ? |
180 AltHashing::murmur3_32(seed(), (const jbyte*)s, len) : | |
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181 java_lang_String::hash_code(s, len); |
6162 | 182 } |
183 | |
0 | 184 |
185 // We take care not to be blocking while holding the | |
186 // SymbolTable_lock. Otherwise, the system might deadlock, since the | |
187 // symboltable is used during compilation (VM_thread) The lock free | |
188 // synchronization is simplified by the fact that we do not delete | |
189 // entries in the symbol table during normal execution (only during | |
190 // safepoints). | |
191 | |
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192 Symbol* SymbolTable::lookup(const char* name, int len, TRAPS) { |
0 | 193 unsigned int hashValue = hash_symbol(name, len); |
194 int index = the_table()->hash_to_index(hashValue); | |
195 | |
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196 Symbol* s = the_table()->lookup(index, name, len, hashValue); |
0 | 197 |
198 // Found | |
199 if (s != NULL) return s; | |
200 | |
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201 // Grab SymbolTable_lock first. |
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202 MutexLocker ml(SymbolTable_lock, THREAD); |
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203 |
0 | 204 // Otherwise, add to symbol to table |
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205 return the_table()->basic_add(index, (u1*)name, len, hashValue, true, CHECK_NULL); |
0 | 206 } |
207 | |
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208 Symbol* SymbolTable::lookup(const Symbol* sym, int begin, int end, TRAPS) { |
0 | 209 char* buffer; |
210 int index, len; | |
211 unsigned int hashValue; | |
212 char* name; | |
213 { | |
214 debug_only(No_Safepoint_Verifier nsv;) | |
215 | |
216 name = (char*)sym->base() + begin; | |
217 len = end - begin; | |
218 hashValue = hash_symbol(name, len); | |
219 index = the_table()->hash_to_index(hashValue); | |
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220 Symbol* s = the_table()->lookup(index, name, len, hashValue); |
0 | 221 |
222 // Found | |
223 if (s != NULL) return s; | |
224 } | |
225 | |
226 // Otherwise, add to symbol to table. Copy to a C string first. | |
227 char stack_buf[128]; | |
228 ResourceMark rm(THREAD); | |
229 if (len <= 128) { | |
230 buffer = stack_buf; | |
231 } else { | |
232 buffer = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len); | |
233 } | |
234 for (int i=0; i<len; i++) { | |
235 buffer[i] = name[i]; | |
236 } | |
237 // Make sure there is no safepoint in the code above since name can't move. | |
238 // We can't include the code in No_Safepoint_Verifier because of the | |
239 // ResourceMark. | |
240 | |
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241 // Grab SymbolTable_lock first. |
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242 MutexLocker ml(SymbolTable_lock, THREAD); |
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243 |
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244 return the_table()->basic_add(index, (u1*)buffer, len, hashValue, true, CHECK_NULL); |
0 | 245 } |
246 | |
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247 Symbol* SymbolTable::lookup_only(const char* name, int len, |
0 | 248 unsigned int& hash) { |
249 hash = hash_symbol(name, len); | |
250 int index = the_table()->hash_to_index(hash); | |
251 | |
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252 Symbol* s = the_table()->lookup(index, name, len, hash); |
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253 return s; |
0 | 254 } |
255 | |
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256 // Look up the address of the literal in the SymbolTable for this Symbol* |
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257 // Do not create any new symbols |
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258 // Do not increment the reference count to keep this alive |
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259 Symbol** SymbolTable::lookup_symbol_addr(Symbol* sym){ |
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260 unsigned int hash = hash_symbol((char*)sym->bytes(), sym->utf8_length()); |
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261 int index = the_table()->hash_to_index(hash); |
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262 |
6197 | 263 for (HashtableEntry<Symbol*, mtSymbol>* e = the_table()->bucket(index); e != NULL; e = e->next()) { |
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264 if (e->hash() == hash) { |
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265 Symbol* literal_sym = e->literal(); |
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266 if (sym == literal_sym) { |
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267 return e->literal_addr(); |
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268 } |
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269 } |
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270 } |
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271 return NULL; |
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272 } |
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273 |
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274 // Suggestion: Push unicode-based lookup all the way into the hashing |
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275 // and probing logic, so there is no need for convert_to_utf8 until |
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276 // an actual new Symbol* is created. |
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277 Symbol* SymbolTable::lookup_unicode(const jchar* name, int utf16_length, TRAPS) { |
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278 int utf8_length = UNICODE::utf8_length((jchar*) name, utf16_length); |
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279 char stack_buf[128]; |
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280 if (utf8_length < (int) sizeof(stack_buf)) { |
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281 char* chars = stack_buf; |
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282 UNICODE::convert_to_utf8(name, utf16_length, chars); |
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283 return lookup(chars, utf8_length, THREAD); |
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284 } else { |
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285 ResourceMark rm(THREAD); |
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286 char* chars = NEW_RESOURCE_ARRAY(char, utf8_length + 1);; |
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287 UNICODE::convert_to_utf8(name, utf16_length, chars); |
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288 return lookup(chars, utf8_length, THREAD); |
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289 } |
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290 } |
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291 |
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292 Symbol* SymbolTable::lookup_only_unicode(const jchar* name, int utf16_length, |
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293 unsigned int& hash) { |
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294 int utf8_length = UNICODE::utf8_length((jchar*) name, utf16_length); |
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295 char stack_buf[128]; |
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296 if (utf8_length < (int) sizeof(stack_buf)) { |
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297 char* chars = stack_buf; |
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298 UNICODE::convert_to_utf8(name, utf16_length, chars); |
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299 return lookup_only(chars, utf8_length, hash); |
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300 } else { |
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301 ResourceMark rm; |
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302 char* chars = NEW_RESOURCE_ARRAY(char, utf8_length + 1);; |
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303 UNICODE::convert_to_utf8(name, utf16_length, chars); |
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304 return lookup_only(chars, utf8_length, hash); |
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305 } |
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306 } |
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307 |
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308 void SymbolTable::add(ClassLoaderData* loader_data, constantPoolHandle cp, |
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309 int names_count, |
0 | 310 const char** names, int* lengths, int* cp_indices, |
311 unsigned int* hashValues, TRAPS) { | |
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312 // Grab SymbolTable_lock first. |
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313 MutexLocker ml(SymbolTable_lock, THREAD); |
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314 |
0 | 315 SymbolTable* table = the_table(); |
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316 bool added = table->basic_add(loader_data, cp, names_count, names, lengths, |
0 | 317 cp_indices, hashValues, CHECK); |
318 if (!added) { | |
319 // do it the hard way | |
320 for (int i=0; i<names_count; i++) { | |
321 int index = table->hash_to_index(hashValues[i]); | |
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322 bool c_heap = !loader_data->is_the_null_class_loader_data(); |
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323 Symbol* sym = table->basic_add(index, (u1*)names[i], lengths[i], hashValues[i], c_heap, CHECK); |
0 | 324 cp->symbol_at_put(cp_indices[i], sym); |
325 } | |
326 } | |
327 } | |
328 | |
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329 Symbol* SymbolTable::new_permanent_symbol(const char* name, TRAPS) { |
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330 unsigned int hash; |
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331 Symbol* result = SymbolTable::lookup_only((char*)name, (int)strlen(name), hash); |
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332 if (result != NULL) { |
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333 return result; |
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334 } |
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335 // Grab SymbolTable_lock first. |
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336 MutexLocker ml(SymbolTable_lock, THREAD); |
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337 |
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338 SymbolTable* table = the_table(); |
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339 int index = table->hash_to_index(hash); |
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340 return table->basic_add(index, (u1*)name, (int)strlen(name), hash, false, THREAD); |
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341 } |
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342 |
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343 Symbol* SymbolTable::basic_add(int index_arg, u1 *name, int len, |
6162 | 344 unsigned int hashValue_arg, bool c_heap, TRAPS) { |
0 | 345 assert(!Universe::heap()->is_in_reserved(name) || GC_locker::is_active(), |
346 "proposed name of symbol must be stable"); | |
347 | |
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348 // Don't allow symbols to be created which cannot fit in a Symbol*. |
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349 if (len > Symbol::max_length()) { |
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350 THROW_MSG_0(vmSymbols::java_lang_InternalError(), |
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351 "name is too long to represent"); |
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352 } |
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353 |
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354 // Cannot hit a safepoint in this function because the "this" pointer can move. |
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355 No_Safepoint_Verifier nsv; |
0 | 356 |
6162 | 357 // Check if the symbol table has been rehashed, if so, need to recalculate |
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358 // the hash value and index. |
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359 unsigned int hashValue; |
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360 int index; |
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361 if (use_alternate_hashcode()) { |
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362 hashValue = hash_symbol((const char*)name, len); |
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363 index = hash_to_index(hashValue); |
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364 } else { |
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365 hashValue = hashValue_arg; |
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366 index = index_arg; |
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367 } |
6162 | 368 |
0 | 369 // Since look-up was done lock-free, we need to check if another |
370 // thread beat us in the race to insert the symbol. | |
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371 Symbol* test = lookup(index, (char*)name, len, hashValue); |
0 | 372 if (test != NULL) { |
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373 // A race occurred and another thread introduced the symbol. |
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374 assert(test->refcount() != 0, "lookup should have incremented the count"); |
0 | 375 return test; |
376 } | |
377 | |
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378 // Create a new symbol. |
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379 Symbol* sym = allocate_symbol(name, len, c_heap, CHECK_NULL); |
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380 assert(sym->equals((char*)name, len), "symbol must be properly initialized"); |
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381 |
6197 | 382 HashtableEntry<Symbol*, mtSymbol>* entry = new_entry(hashValue, sym); |
0 | 383 add_entry(index, entry); |
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384 return sym; |
0 | 385 } |
386 | |
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387 // This version of basic_add adds symbols in batch from the constant pool |
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388 // parsing. |
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389 bool SymbolTable::basic_add(ClassLoaderData* loader_data, constantPoolHandle cp, |
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390 int names_count, |
0 | 391 const char** names, int* lengths, |
392 int* cp_indices, unsigned int* hashValues, | |
393 TRAPS) { | |
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394 |
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395 // Check symbol names are not too long. If any are too long, don't add any. |
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396 for (int i = 0; i< names_count; i++) { |
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397 if (lengths[i] > Symbol::max_length()) { |
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398 THROW_MSG_0(vmSymbols::java_lang_InternalError(), |
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399 "name is too long to represent"); |
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400 } |
0 | 401 } |
402 | |
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403 // Cannot hit a safepoint in this function because the "this" pointer can move. |
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404 No_Safepoint_Verifier nsv; |
0 | 405 |
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406 for (int i=0; i<names_count; i++) { |
6162 | 407 // Check if the symbol table has been rehashed, if so, need to recalculate |
408 // the hash value. | |
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409 unsigned int hashValue; |
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410 if (use_alternate_hashcode()) { |
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411 hashValue = hash_symbol(names[i], lengths[i]); |
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412 } else { |
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413 hashValue = hashValues[i]; |
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414 } |
0 | 415 // Since look-up was done lock-free, we need to check if another |
416 // thread beat us in the race to insert the symbol. | |
6162 | 417 int index = hash_to_index(hashValue); |
418 Symbol* test = lookup(index, names[i], lengths[i], hashValue); | |
0 | 419 if (test != NULL) { |
605 | 420 // A race occurred and another thread introduced the symbol, this one |
0 | 421 // will be dropped and collected. Use test instead. |
422 cp->symbol_at_put(cp_indices[i], test); | |
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423 assert(test->refcount() != 0, "lookup should have incremented the count"); |
0 | 424 } else { |
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425 // Create a new symbol. The null class loader is never unloaded so these |
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426 // are allocated specially in a permanent arena. |
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427 bool c_heap = !loader_data->is_the_null_class_loader_data(); |
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428 Symbol* sym = allocate_symbol((const u1*)names[i], lengths[i], c_heap, CHECK_(false)); |
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429 assert(sym->equals(names[i], lengths[i]), "symbol must be properly initialized"); // why wouldn't it be??? |
6197 | 430 HashtableEntry<Symbol*, mtSymbol>* entry = new_entry(hashValue, sym); |
0 | 431 add_entry(index, entry); |
432 cp->symbol_at_put(cp_indices[i], sym); | |
433 } | |
434 } | |
435 return true; | |
436 } | |
437 | |
438 | |
439 void SymbolTable::verify() { | |
440 for (int i = 0; i < the_table()->table_size(); ++i) { | |
6197 | 441 HashtableEntry<Symbol*, mtSymbol>* p = the_table()->bucket(i); |
0 | 442 for ( ; p != NULL; p = p->next()) { |
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443 Symbol* s = (Symbol*)(p->literal()); |
0 | 444 guarantee(s != NULL, "symbol is NULL"); |
445 unsigned int h = hash_symbol((char*)s->bytes(), s->utf8_length()); | |
446 guarantee(p->hash() == h, "broken hash in symbol table entry"); | |
447 guarantee(the_table()->hash_to_index(h) == i, | |
448 "wrong index in symbol table"); | |
449 } | |
450 } | |
451 } | |
452 | |
6162 | 453 void SymbolTable::dump(outputStream* st) { |
454 NumberSeq summary; | |
455 for (int i = 0; i < the_table()->table_size(); ++i) { | |
456 int count = 0; | |
6197 | 457 for (HashtableEntry<Symbol*, mtSymbol>* e = the_table()->bucket(i); |
6162 | 458 e != NULL; e = e->next()) { |
459 count++; | |
460 } | |
461 summary.add((double)count); | |
462 } | |
463 st->print_cr("SymbolTable statistics:"); | |
464 st->print_cr("Number of buckets : %7d", summary.num()); | |
465 st->print_cr("Average bucket size : %7.0f", summary.avg()); | |
466 st->print_cr("Variance of bucket size : %7.0f", summary.variance()); | |
467 st->print_cr("Std. dev. of bucket size: %7.0f", summary.sd()); | |
468 st->print_cr("Maximum bucket size : %7.0f", summary.maximum()); | |
469 } | |
470 | |
0 | 471 |
472 //--------------------------------------------------------------------------- | |
473 // Non-product code | |
474 | |
475 #ifndef PRODUCT | |
476 | |
477 void SymbolTable::print_histogram() { | |
478 MutexLocker ml(SymbolTable_lock); | |
479 const int results_length = 100; | |
480 int results[results_length]; | |
481 int i,j; | |
482 | |
483 // initialize results to zero | |
484 for (j = 0; j < results_length; j++) { | |
485 results[j] = 0; | |
486 } | |
487 | |
488 int total = 0; | |
489 int max_symbols = 0; | |
490 int out_of_range = 0; | |
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491 int memory_total = 0; |
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492 int count = 0; |
0 | 493 for (i = 0; i < the_table()->table_size(); i++) { |
6197 | 494 HashtableEntry<Symbol*, mtSymbol>* p = the_table()->bucket(i); |
0 | 495 for ( ; p != NULL; p = p->next()) { |
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496 memory_total += p->literal()->size(); |
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497 count++; |
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498 int counter = p->literal()->utf8_length(); |
0 | 499 total += counter; |
500 if (counter < results_length) { | |
501 results[counter]++; | |
502 } else { | |
503 out_of_range++; | |
504 } | |
505 max_symbols = MAX2(max_symbols, counter); | |
506 } | |
507 } | |
508 tty->print_cr("Symbol Table:"); | |
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509 tty->print_cr("Total number of symbols %5d", count); |
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510 tty->print_cr("Total size in memory %5dK", |
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511 (memory_total*HeapWordSize)/1024); |
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512 tty->print_cr("Total counted %5d", symbols_counted); |
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513 tty->print_cr("Total removed %5d", symbols_removed); |
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514 if (symbols_counted > 0) { |
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515 tty->print_cr("Percent removed %3.2f", |
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516 ((float)symbols_removed/(float)symbols_counted)* 100); |
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517 } |
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518 tty->print_cr("Reference counts %5d", Symbol::_total_count); |
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519 tty->print_cr("Symbol arena size %5d used %5d", |
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520 arena()->size_in_bytes(), arena()->used()); |
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521 tty->print_cr("Histogram of symbol length:"); |
0 | 522 tty->print_cr("%8s %5d", "Total ", total); |
523 tty->print_cr("%8s %5d", "Maximum", max_symbols); | |
524 tty->print_cr("%8s %3.2f", "Average", | |
525 ((float) total / (float) the_table()->table_size())); | |
526 tty->print_cr("%s", "Histogram:"); | |
527 tty->print_cr(" %s %29s", "Length", "Number chains that length"); | |
528 for (i = 0; i < results_length; i++) { | |
529 if (results[i] > 0) { | |
530 tty->print_cr("%6d %10d", i, results[i]); | |
531 } | |
532 } | |
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533 if (Verbose) { |
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534 int line_length = 70; |
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535 tty->print_cr("%s %30s", " Length", "Number chains that length"); |
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536 for (i = 0; i < results_length; i++) { |
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537 if (results[i] > 0) { |
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538 tty->print("%4d", i); |
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539 for (j = 0; (j < results[i]) && (j < line_length); j++) { |
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540 tty->print("%1s", "*"); |
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541 } |
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542 if (j == line_length) { |
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543 tty->print("%1s", "+"); |
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544 } |
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545 tty->cr(); |
0 | 546 } |
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547 } |
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548 } |
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549 tty->print_cr(" %s %d: %d\n", "Number chains longer than", |
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550 results_length, out_of_range); |
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551 } |
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552 |
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553 void SymbolTable::print() { |
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554 for (int i = 0; i < the_table()->table_size(); ++i) { |
6197 | 555 HashtableEntry<Symbol*, mtSymbol>** p = the_table()->bucket_addr(i); |
556 HashtableEntry<Symbol*, mtSymbol>* entry = the_table()->bucket(i); | |
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557 if (entry != NULL) { |
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558 while (entry != NULL) { |
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559 tty->print(PTR_FORMAT " ", entry->literal()); |
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560 entry->literal()->print(); |
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561 tty->print(" %d", entry->literal()->refcount()); |
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562 p = entry->next_addr(); |
6197 | 563 entry = (HashtableEntry<Symbol*, mtSymbol>*)HashtableEntry<Symbol*, mtSymbol>::make_ptr(*p); |
0 | 564 } |
565 tty->cr(); | |
566 } | |
567 } | |
568 } | |
569 #endif // PRODUCT | |
570 | |
571 // -------------------------------------------------------------------------- | |
572 | |
573 #ifdef ASSERT | |
574 class StableMemoryChecker : public StackObj { | |
575 enum { _bufsize = wordSize*4 }; | |
576 | |
577 address _region; | |
578 jint _size; | |
579 u1 _save_buf[_bufsize]; | |
580 | |
581 int sample(u1* save_buf) { | |
582 if (_size <= _bufsize) { | |
583 memcpy(save_buf, _region, _size); | |
584 return _size; | |
585 } else { | |
586 // copy head and tail | |
587 memcpy(&save_buf[0], _region, _bufsize/2); | |
588 memcpy(&save_buf[_bufsize/2], _region + _size - _bufsize/2, _bufsize/2); | |
589 return (_bufsize/2)*2; | |
590 } | |
591 } | |
592 | |
593 public: | |
594 StableMemoryChecker(const void* region, jint size) { | |
595 _region = (address) region; | |
596 _size = size; | |
597 sample(_save_buf); | |
598 } | |
599 | |
600 bool verify() { | |
601 u1 check_buf[sizeof(_save_buf)]; | |
602 int check_size = sample(check_buf); | |
603 return (0 == memcmp(_save_buf, check_buf, check_size)); | |
604 } | |
605 | |
606 void set_region(const void* region) { _region = (address) region; } | |
607 }; | |
608 #endif | |
609 | |
610 | |
611 // -------------------------------------------------------------------------- | |
612 StringTable* StringTable::_the_table = NULL; | |
613 | |
6162 | 614 bool StringTable::_needs_rehashing = false; |
615 | |
616 // Pick hashing algorithm | |
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617 unsigned int StringTable::hash_string(const jchar* s, int len) { |
6162 | 618 return use_alternate_hashcode() ? AltHashing::murmur3_32(seed(), s, len) : |
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619 java_lang_String::hash_code(s, len); |
6162 | 620 } |
621 | |
0 | 622 oop StringTable::lookup(int index, jchar* name, |
623 int len, unsigned int hash) { | |
6162 | 624 int count = 0; |
6197 | 625 for (HashtableEntry<oop, mtSymbol>* l = bucket(index); l != NULL; l = l->next()) { |
6162 | 626 count++; |
0 | 627 if (l->hash() == hash) { |
628 if (java_lang_String::equals(l->literal(), name, len)) { | |
629 return l->literal(); | |
630 } | |
631 } | |
632 } | |
6162 | 633 // If the bucket size is too deep check if this hash code is insufficient. |
6197 | 634 if (count >= BasicHashtable<mtSymbol>::rehash_count && !needs_rehashing()) { |
6162 | 635 _needs_rehashing = check_rehash_table(count); |
636 } | |
0 | 637 return NULL; |
638 } | |
639 | |
640 | |
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641 oop StringTable::basic_add(int index_arg, Handle string, jchar* name, |
6162 | 642 int len, unsigned int hashValue_arg, TRAPS) { |
0 | 643 |
644 assert(java_lang_String::equals(string(), name, len), | |
645 "string must be properly initialized"); | |
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646 // Cannot hit a safepoint in this function because the "this" pointer can move. |
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647 No_Safepoint_Verifier nsv; |
0 | 648 |
6162 | 649 // Check if the symbol table has been rehashed, if so, need to recalculate |
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650 // the hash value and index before second lookup. |
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651 unsigned int hashValue; |
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652 int index; |
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653 if (use_alternate_hashcode()) { |
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654 hashValue = hash_string(name, len); |
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655 index = hash_to_index(hashValue); |
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656 } else { |
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657 hashValue = hashValue_arg; |
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658 index = index_arg; |
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659 } |
6162 | 660 |
0 | 661 // Since look-up was done lock-free, we need to check if another |
662 // thread beat us in the race to insert the symbol. | |
663 | |
664 oop test = lookup(index, name, len, hashValue); // calls lookup(u1*, int) | |
665 if (test != NULL) { | |
666 // Entry already added | |
667 return test; | |
668 } | |
669 | |
6197 | 670 HashtableEntry<oop, mtSymbol>* entry = new_entry(hashValue, string()); |
0 | 671 add_entry(index, entry); |
672 return string(); | |
673 } | |
674 | |
675 | |
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676 oop StringTable::lookup(Symbol* symbol) { |
0 | 677 ResourceMark rm; |
678 int length; | |
679 jchar* chars = symbol->as_unicode(length); | |
8850 | 680 return lookup(chars, length); |
681 } | |
682 | |
683 | |
684 oop StringTable::lookup(jchar* name, int len) { | |
685 unsigned int hash = hash_string(name, len); | |
686 int index = the_table()->hash_to_index(hash); | |
687 return the_table()->lookup(index, name, len, hash); | |
0 | 688 } |
689 | |
690 | |
691 oop StringTable::intern(Handle string_or_null, jchar* name, | |
692 int len, TRAPS) { | |
6162 | 693 unsigned int hashValue = hash_string(name, len); |
0 | 694 int index = the_table()->hash_to_index(hashValue); |
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695 oop found_string = the_table()->lookup(index, name, len, hashValue); |
0 | 696 |
697 // Found | |
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698 if (found_string != NULL) return found_string; |
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699 |
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700 debug_only(StableMemoryChecker smc(name, len * sizeof(name[0]))); |
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701 assert(!Universe::heap()->is_in_reserved(name) || GC_locker::is_active(), |
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702 "proposed name of symbol must be stable"); |
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703 |
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704 Handle string; |
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705 // try to reuse the string if possible |
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706 if (!string_or_null.is_null()) { |
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707 string = string_or_null; |
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708 } else { |
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709 string = java_lang_String::create_from_unicode(name, len, CHECK_NULL); |
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710 } |
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711 |
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712 // Grab the StringTable_lock before getting the_table() because it could |
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713 // change at safepoint. |
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714 MutexLocker ml(StringTable_lock, THREAD); |
0 | 715 |
716 // Otherwise, add to symbol to table | |
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717 return the_table()->basic_add(index, string, name, len, |
0 | 718 hashValue, CHECK_NULL); |
719 } | |
720 | |
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721 oop StringTable::intern(Symbol* symbol, TRAPS) { |
0 | 722 if (symbol == NULL) return NULL; |
723 ResourceMark rm(THREAD); | |
724 int length; | |
725 jchar* chars = symbol->as_unicode(length); | |
726 Handle string; | |
727 oop result = intern(string, chars, length, CHECK_NULL); | |
728 return result; | |
729 } | |
730 | |
731 | |
732 oop StringTable::intern(oop string, TRAPS) | |
733 { | |
734 if (string == NULL) return NULL; | |
735 ResourceMark rm(THREAD); | |
736 int length; | |
737 Handle h_string (THREAD, string); | |
738 jchar* chars = java_lang_String::as_unicode_string(string, length); | |
739 oop result = intern(h_string, chars, length, CHECK_NULL); | |
740 return result; | |
741 } | |
742 | |
743 | |
744 oop StringTable::intern(const char* utf8_string, TRAPS) { | |
745 if (utf8_string == NULL) return NULL; | |
746 ResourceMark rm(THREAD); | |
747 int length = UTF8::unicode_length(utf8_string); | |
748 jchar* chars = NEW_RESOURCE_ARRAY(jchar, length); | |
749 UTF8::convert_to_unicode(utf8_string, chars, length); | |
750 Handle string; | |
751 oop result = intern(string, chars, length, CHECK_NULL); | |
752 return result; | |
753 } | |
754 | |
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755 void StringTable::unlink(BoolObjectClosure* is_alive) { |
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756 // Readers of the table are unlocked, so we should only be removing |
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757 // entries at a safepoint. |
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758 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
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759 for (int i = 0; i < the_table()->table_size(); ++i) { |
6197 | 760 HashtableEntry<oop, mtSymbol>** p = the_table()->bucket_addr(i); |
761 HashtableEntry<oop, mtSymbol>* entry = the_table()->bucket(i); | |
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762 while (entry != NULL) { |
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763 // Shared entries are normally at the end of the bucket and if we run into |
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764 // a shared entry, then there is nothing more to remove. However, if we |
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765 // have rehashed the table, then the shared entries are no longer at the |
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766 // end of the bucket. |
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767 if (entry->is_shared() && !use_alternate_hashcode()) { |
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768 break; |
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769 } |
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770 assert(entry->literal() != NULL, "just checking"); |
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771 if (entry->is_shared() || is_alive->do_object_b(entry->literal())) { |
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772 p = entry->next_addr(); |
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773 } else { |
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774 *p = entry->next(); |
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775 the_table()->free_entry(entry); |
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776 } |
6197 | 777 entry = (HashtableEntry<oop, mtSymbol>*)HashtableEntry<oop, mtSymbol>::make_ptr(*p); |
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778 } |
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779 } |
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780 } |
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781 |
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782 void StringTable::oops_do(OopClosure* f) { |
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783 for (int i = 0; i < the_table()->table_size(); ++i) { |
6197 | 784 HashtableEntry<oop, mtSymbol>** p = the_table()->bucket_addr(i); |
785 HashtableEntry<oop, mtSymbol>* entry = the_table()->bucket(i); | |
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786 while (entry != NULL) { |
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787 f->do_oop((oop*)entry->literal_addr()); |
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788 |
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789 // Did the closure remove the literal from the table? |
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790 if (entry->literal() == NULL) { |
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791 assert(!entry->is_shared(), "immutable hashtable entry?"); |
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792 *p = entry->next(); |
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793 the_table()->free_entry(entry); |
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794 } else { |
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795 p = entry->next_addr(); |
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796 } |
6197 | 797 entry = (HashtableEntry<oop, mtSymbol>*)HashtableEntry<oop, mtSymbol>::make_ptr(*p); |
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798 } |
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799 } |
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800 } |
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801 |
0 | 802 void StringTable::verify() { |
803 for (int i = 0; i < the_table()->table_size(); ++i) { | |
6197 | 804 HashtableEntry<oop, mtSymbol>* p = the_table()->bucket(i); |
0 | 805 for ( ; p != NULL; p = p->next()) { |
806 oop s = p->literal(); | |
807 guarantee(s != NULL, "interned string is NULL"); | |
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808 unsigned int h = java_lang_String::hash_string(s); |
0 | 809 guarantee(p->hash() == h, "broken hash in string table entry"); |
810 guarantee(the_table()->hash_to_index(h) == i, | |
811 "wrong index in string table"); | |
812 } | |
813 } | |
814 } | |
6162 | 815 |
816 void StringTable::dump(outputStream* st) { | |
817 NumberSeq summary; | |
818 for (int i = 0; i < the_table()->table_size(); ++i) { | |
6197 | 819 HashtableEntry<oop, mtSymbol>* p = the_table()->bucket(i); |
6162 | 820 int count = 0; |
821 for ( ; p != NULL; p = p->next()) { | |
822 count++; | |
823 } | |
824 summary.add((double)count); | |
825 } | |
826 st->print_cr("StringTable statistics:"); | |
827 st->print_cr("Number of buckets : %7d", summary.num()); | |
828 st->print_cr("Average bucket size : %7.0f", summary.avg()); | |
829 st->print_cr("Variance of bucket size : %7.0f", summary.variance()); | |
830 st->print_cr("Std. dev. of bucket size: %7.0f", summary.sd()); | |
831 st->print_cr("Maximum bucket size : %7.0f", summary.maximum()); | |
832 } | |
833 | |
834 | |
835 // Create a new table and using alternate hash code, populate the new table | |
836 // with the existing strings. Set flag to use the alternate hash code afterwards. | |
837 void StringTable::rehash_table() { | |
838 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
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839 // This should never happen with -Xshare:dump but it might in testing mode. |
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840 if (DumpSharedSpaces) return; |
6162 | 841 StringTable* new_table = new StringTable(); |
842 | |
843 // Rehash the table | |
844 the_table()->move_to(new_table); | |
845 | |
846 // Delete the table and buckets (entries are reused in new table). | |
847 delete _the_table; | |
848 // Don't check if we need rehashing until the table gets unbalanced again. | |
849 // Then rehash with a new global seed. | |
850 _needs_rehashing = false; | |
851 _the_table = new_table; | |
852 } |