Mercurial > hg > graal-compiler
annotate src/share/vm/classfile/symbolTable.cpp @ 17912:653e11c86c5a
8041959: Skip replay parsing errors with ReplayIgnoreInitErrors
Summary: Allow replay compilation with replay file parsing error.
Reviewed-by: twisti, iveresov
| author | kvn |
|---|---|
| date | Tue, 29 Apr 2014 10:29:56 -0700 |
| parents | 595c0f60d50d |
| children | 78bbf4d43a14 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 17764 | 2 * Copyright (c) 1997, 2014, 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" | |
| 17764 | 38 #if INCLUDE_ALL_GCS |
| 39 #include "gc_implementation/g1/g1StringDedup.hpp" | |
| 40 #endif | |
| 0 | 41 |
| 42 // -------------------------------------------------------------------------- | |
| 43 | |
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44 // the number of buckets a thread claims |
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45 const int ClaimChunkSize = 32; |
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46 |
| 0 | 47 SymbolTable* SymbolTable::_the_table = NULL; |
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48 // Static arena for symbols that are not deallocated |
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49 Arena* SymbolTable::_arena = NULL; |
| 6162 | 50 bool SymbolTable::_needs_rehashing = false; |
| 0 | 51 |
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52 Symbol* SymbolTable::allocate_symbol(const u1* name, int len, bool c_heap, TRAPS) { |
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53 assert (len <= Symbol::max_length(), "should be checked by caller"); |
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54 |
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55 Symbol* sym; |
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56 |
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57 if (DumpSharedSpaces) { |
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58 // Allocate all symbols to CLD shared metaspace |
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59 sym = new (len, ClassLoaderData::the_null_class_loader_data(), THREAD) Symbol(name, len, -1); |
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60 } else if (c_heap) { |
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61 // refcount starts as 1 |
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62 sym = new (len, THREAD) Symbol(name, len, 1); |
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63 assert(sym != NULL, "new should call vm_exit_out_of_memory if C_HEAP is exhausted"); |
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64 } else { |
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65 // Allocate to global arena |
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66 sym = new (len, arena(), THREAD) Symbol(name, len, -1); |
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67 } |
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68 return sym; |
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69 } |
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70 |
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71 void SymbolTable::initialize_symbols(int arena_alloc_size) { |
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72 // Initialize the arena for global symbols, size passed in depends on CDS. |
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73 if (arena_alloc_size == 0) { |
| 6197 | 74 _arena = new (mtSymbol) Arena(); |
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75 } else { |
| 6197 | 76 _arena = new (mtSymbol) Arena(arena_alloc_size); |
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77 } |
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78 } |
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79 |
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80 // Call function for all symbols in the symbol table. |
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81 void SymbolTable::symbols_do(SymbolClosure *cl) { |
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82 const int n = the_table()->table_size(); |
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83 for (int i = 0; i < n; i++) { |
| 6197 | 84 for (HashtableEntry<Symbol*, mtSymbol>* p = the_table()->bucket(i); |
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85 p != NULL; |
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86 p = p->next()) { |
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87 cl->do_symbol(p->literal_addr()); |
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88 } |
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89 } |
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90 } |
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91 |
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92 int SymbolTable::_symbols_removed = 0; |
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93 int SymbolTable::_symbols_counted = 0; |
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94 volatile int SymbolTable::_parallel_claimed_idx = 0; |
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95 |
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96 void SymbolTable::buckets_unlink(int start_idx, int end_idx, int* processed, int* removed, size_t* memory_total) { |
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97 for (int i = start_idx; i < end_idx; ++i) { |
| 6197 | 98 HashtableEntry<Symbol*, mtSymbol>** p = the_table()->bucket_addr(i); |
| 99 HashtableEntry<Symbol*, mtSymbol>* entry = the_table()->bucket(i); | |
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100 while (entry != NULL) { |
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101 // Shared entries are normally at the end of the bucket and if we run into |
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102 // a shared entry, then there is nothing more to remove. However, if we |
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103 // have rehashed the table, then the shared entries are no longer at the |
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104 // end of the bucket. |
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105 if (entry->is_shared() && !use_alternate_hashcode()) { |
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106 break; |
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107 } |
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108 Symbol* s = entry->literal(); |
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109 (*memory_total) += s->size(); |
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110 (*processed)++; |
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111 assert(s != NULL, "just checking"); |
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112 // If reference count is zero, remove. |
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113 if (s->refcount() == 0) { |
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114 assert(!entry->is_shared(), "shared entries should be kept live"); |
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115 delete s; |
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116 (*removed)++; |
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117 *p = entry->next(); |
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118 the_table()->free_entry(entry); |
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119 } else { |
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120 p = entry->next_addr(); |
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121 } |
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122 // get next entry |
| 6197 | 123 entry = (HashtableEntry<Symbol*, mtSymbol>*)HashtableEntry<Symbol*, mtSymbol>::make_ptr(*p); |
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124 } |
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125 } |
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126 } |
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127 |
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128 // Remove unreferenced symbols from the symbol table |
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129 // This is done late during GC. |
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130 void SymbolTable::unlink(int* processed, int* removed) { |
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131 size_t memory_total = 0; |
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132 buckets_unlink(0, the_table()->table_size(), processed, removed, &memory_total); |
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133 _symbols_removed += *removed; |
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134 _symbols_counted += *processed; |
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135 // Exclude printing for normal PrintGCDetails because people parse |
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136 // this output. |
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137 if (PrintGCDetails && Verbose && WizardMode) { |
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138 gclog_or_tty->print(" [Symbols=%d size=" SIZE_FORMAT "K] ", *processed, |
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139 (memory_total*HeapWordSize)/1024); |
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140 } |
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141 } |
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142 |
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143 void SymbolTable::possibly_parallel_unlink(int* processed, int* removed) { |
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144 const int limit = the_table()->table_size(); |
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145 |
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146 size_t memory_total = 0; |
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147 |
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148 for (;;) { |
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149 // Grab next set of buckets to scan |
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150 int start_idx = Atomic::add(ClaimChunkSize, &_parallel_claimed_idx) - ClaimChunkSize; |
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151 if (start_idx >= limit) { |
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152 // End of table |
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153 break; |
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154 } |
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155 |
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156 int end_idx = MIN2(limit, start_idx + ClaimChunkSize); |
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157 buckets_unlink(start_idx, end_idx, processed, removed, &memory_total); |
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158 } |
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159 Atomic::add(*processed, &_symbols_counted); |
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160 Atomic::add(*removed, &_symbols_removed); |
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161 // Exclude printing for normal PrintGCDetails because people parse |
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162 // this output. |
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163 if (PrintGCDetails && Verbose && WizardMode) { |
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164 gclog_or_tty->print(" [Symbols: scanned=%d removed=%d size=" SIZE_FORMAT "K] ", *processed, *removed, |
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165 (memory_total*HeapWordSize)/1024); |
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166 } |
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167 } |
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168 |
| 6162 | 169 // Create a new table and using alternate hash code, populate the new table |
| 170 // with the existing strings. Set flag to use the alternate hash code afterwards. | |
| 171 void SymbolTable::rehash_table() { | |
| 172 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
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173 // This should never happen with -Xshare:dump but it might in testing mode. |
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174 if (DumpSharedSpaces) return; |
| 6162 | 175 // Create a new symbol table |
| 176 SymbolTable* new_table = new SymbolTable(); | |
| 177 | |
| 178 the_table()->move_to(new_table); | |
| 179 | |
| 180 // Delete the table and buckets (entries are reused in new table). | |
| 181 delete _the_table; | |
| 182 // Don't check if we need rehashing until the table gets unbalanced again. | |
| 183 // Then rehash with a new global seed. | |
| 184 _needs_rehashing = false; | |
| 185 _the_table = new_table; | |
| 186 } | |
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187 |
| 0 | 188 // Lookup a symbol in a bucket. |
| 189 | |
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190 Symbol* SymbolTable::lookup(int index, const char* name, |
| 0 | 191 int len, unsigned int hash) { |
| 6162 | 192 int count = 0; |
| 6197 | 193 for (HashtableEntry<Symbol*, mtSymbol>* e = bucket(index); e != NULL; e = e->next()) { |
| 6162 | 194 count++; // count all entries in this bucket, not just ones with same hash |
| 0 | 195 if (e->hash() == hash) { |
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196 Symbol* sym = e->literal(); |
| 0 | 197 if (sym->equals(name, len)) { |
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198 // something is referencing this symbol now. |
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199 sym->increment_refcount(); |
| 0 | 200 return sym; |
| 201 } | |
| 202 } | |
| 203 } | |
| 6162 | 204 // If the bucket size is too deep check if this hash code is insufficient. |
| 6197 | 205 if (count >= BasicHashtable<mtSymbol>::rehash_count && !needs_rehashing()) { |
| 6162 | 206 _needs_rehashing = check_rehash_table(count); |
| 207 } | |
| 0 | 208 return NULL; |
| 209 } | |
| 210 | |
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211 // Pick hashing algorithm. |
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212 unsigned int SymbolTable::hash_symbol(const char* s, int len) { |
| 6162 | 213 return use_alternate_hashcode() ? |
| 214 AltHashing::murmur3_32(seed(), (const jbyte*)s, len) : | |
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215 java_lang_String::hash_code(s, len); |
| 6162 | 216 } |
| 217 | |
| 0 | 218 |
| 219 // We take care not to be blocking while holding the | |
| 220 // SymbolTable_lock. Otherwise, the system might deadlock, since the | |
| 221 // symboltable is used during compilation (VM_thread) The lock free | |
| 222 // synchronization is simplified by the fact that we do not delete | |
| 223 // entries in the symbol table during normal execution (only during | |
| 224 // safepoints). | |
| 225 | |
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226 Symbol* SymbolTable::lookup(const char* name, int len, TRAPS) { |
| 0 | 227 unsigned int hashValue = hash_symbol(name, len); |
| 228 int index = the_table()->hash_to_index(hashValue); | |
| 229 | |
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230 Symbol* s = the_table()->lookup(index, name, len, hashValue); |
| 0 | 231 |
| 232 // Found | |
| 233 if (s != NULL) return s; | |
| 234 | |
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235 // Grab SymbolTable_lock first. |
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236 MutexLocker ml(SymbolTable_lock, THREAD); |
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237 |
| 0 | 238 // Otherwise, add to symbol to table |
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239 return the_table()->basic_add(index, (u1*)name, len, hashValue, true, CHECK_NULL); |
| 0 | 240 } |
| 241 | |
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242 Symbol* SymbolTable::lookup(const Symbol* sym, int begin, int end, TRAPS) { |
| 0 | 243 char* buffer; |
| 244 int index, len; | |
| 245 unsigned int hashValue; | |
| 246 char* name; | |
| 247 { | |
| 248 debug_only(No_Safepoint_Verifier nsv;) | |
| 249 | |
| 250 name = (char*)sym->base() + begin; | |
| 251 len = end - begin; | |
| 252 hashValue = hash_symbol(name, len); | |
| 253 index = the_table()->hash_to_index(hashValue); | |
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254 Symbol* s = the_table()->lookup(index, name, len, hashValue); |
| 0 | 255 |
| 256 // Found | |
| 257 if (s != NULL) return s; | |
| 258 } | |
| 259 | |
| 260 // Otherwise, add to symbol to table. Copy to a C string first. | |
| 261 char stack_buf[128]; | |
| 262 ResourceMark rm(THREAD); | |
| 263 if (len <= 128) { | |
| 264 buffer = stack_buf; | |
| 265 } else { | |
| 266 buffer = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len); | |
| 267 } | |
| 268 for (int i=0; i<len; i++) { | |
| 269 buffer[i] = name[i]; | |
| 270 } | |
| 271 // Make sure there is no safepoint in the code above since name can't move. | |
| 272 // We can't include the code in No_Safepoint_Verifier because of the | |
| 273 // ResourceMark. | |
| 274 | |
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275 // Grab SymbolTable_lock first. |
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276 MutexLocker ml(SymbolTable_lock, THREAD); |
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277 |
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278 return the_table()->basic_add(index, (u1*)buffer, len, hashValue, true, CHECK_NULL); |
| 0 | 279 } |
| 280 | |
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281 Symbol* SymbolTable::lookup_only(const char* name, int len, |
| 0 | 282 unsigned int& hash) { |
| 283 hash = hash_symbol(name, len); | |
| 284 int index = the_table()->hash_to_index(hash); | |
| 285 | |
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286 Symbol* s = the_table()->lookup(index, name, len, hash); |
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287 return s; |
| 0 | 288 } |
| 289 | |
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290 // Look up the address of the literal in the SymbolTable for this Symbol* |
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291 // Do not create any new symbols |
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292 // Do not increment the reference count to keep this alive |
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293 Symbol** SymbolTable::lookup_symbol_addr(Symbol* sym){ |
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294 unsigned int hash = hash_symbol((char*)sym->bytes(), sym->utf8_length()); |
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295 int index = the_table()->hash_to_index(hash); |
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296 |
| 6197 | 297 for (HashtableEntry<Symbol*, mtSymbol>* e = the_table()->bucket(index); e != NULL; e = e->next()) { |
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298 if (e->hash() == hash) { |
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299 Symbol* literal_sym = e->literal(); |
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300 if (sym == literal_sym) { |
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301 return e->literal_addr(); |
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302 } |
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303 } |
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304 } |
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305 return NULL; |
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306 } |
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307 |
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308 // Suggestion: Push unicode-based lookup all the way into the hashing |
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309 // and probing logic, so there is no need for convert_to_utf8 until |
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310 // an actual new Symbol* is created. |
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311 Symbol* SymbolTable::lookup_unicode(const jchar* name, int utf16_length, TRAPS) { |
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312 int utf8_length = UNICODE::utf8_length((jchar*) name, utf16_length); |
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313 char stack_buf[128]; |
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314 if (utf8_length < (int) sizeof(stack_buf)) { |
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315 char* chars = stack_buf; |
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316 UNICODE::convert_to_utf8(name, utf16_length, chars); |
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317 return lookup(chars, utf8_length, THREAD); |
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318 } else { |
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319 ResourceMark rm(THREAD); |
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320 char* chars = NEW_RESOURCE_ARRAY(char, utf8_length + 1);; |
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321 UNICODE::convert_to_utf8(name, utf16_length, chars); |
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322 return lookup(chars, utf8_length, THREAD); |
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323 } |
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324 } |
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325 |
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326 Symbol* SymbolTable::lookup_only_unicode(const jchar* name, int utf16_length, |
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327 unsigned int& hash) { |
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328 int utf8_length = UNICODE::utf8_length((jchar*) name, utf16_length); |
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329 char stack_buf[128]; |
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330 if (utf8_length < (int) sizeof(stack_buf)) { |
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331 char* chars = stack_buf; |
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332 UNICODE::convert_to_utf8(name, utf16_length, chars); |
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333 return lookup_only(chars, utf8_length, hash); |
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334 } else { |
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335 ResourceMark rm; |
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336 char* chars = NEW_RESOURCE_ARRAY(char, utf8_length + 1);; |
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337 UNICODE::convert_to_utf8(name, utf16_length, chars); |
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338 return lookup_only(chars, utf8_length, hash); |
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339 } |
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340 } |
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341 |
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342 void SymbolTable::add(ClassLoaderData* loader_data, constantPoolHandle cp, |
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343 int names_count, |
| 0 | 344 const char** names, int* lengths, int* cp_indices, |
| 345 unsigned int* hashValues, TRAPS) { | |
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346 // Grab SymbolTable_lock first. |
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347 MutexLocker ml(SymbolTable_lock, THREAD); |
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348 |
| 0 | 349 SymbolTable* table = the_table(); |
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350 bool added = table->basic_add(loader_data, cp, names_count, names, lengths, |
| 0 | 351 cp_indices, hashValues, CHECK); |
| 352 if (!added) { | |
| 353 // do it the hard way | |
| 354 for (int i=0; i<names_count; i++) { | |
| 355 int index = table->hash_to_index(hashValues[i]); | |
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356 bool c_heap = !loader_data->is_the_null_class_loader_data(); |
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357 Symbol* sym = table->basic_add(index, (u1*)names[i], lengths[i], hashValues[i], c_heap, CHECK); |
| 0 | 358 cp->symbol_at_put(cp_indices[i], sym); |
| 359 } | |
| 360 } | |
| 361 } | |
| 362 | |
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363 Symbol* SymbolTable::new_permanent_symbol(const char* name, TRAPS) { |
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364 unsigned int hash; |
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365 Symbol* result = SymbolTable::lookup_only((char*)name, (int)strlen(name), hash); |
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366 if (result != NULL) { |
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367 return result; |
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368 } |
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369 // Grab SymbolTable_lock first. |
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370 MutexLocker ml(SymbolTable_lock, THREAD); |
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371 |
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372 SymbolTable* table = the_table(); |
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373 int index = table->hash_to_index(hash); |
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374 return table->basic_add(index, (u1*)name, (int)strlen(name), hash, false, THREAD); |
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375 } |
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376 |
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377 Symbol* SymbolTable::basic_add(int index_arg, u1 *name, int len, |
| 6162 | 378 unsigned int hashValue_arg, bool c_heap, TRAPS) { |
| 12301 | 379 assert(!Universe::heap()->is_in_reserved(name), |
| 0 | 380 "proposed name of symbol must be stable"); |
| 381 | |
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382 // Don't allow symbols to be created which cannot fit in a Symbol*. |
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383 if (len > Symbol::max_length()) { |
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384 THROW_MSG_0(vmSymbols::java_lang_InternalError(), |
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385 "name is too long to represent"); |
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386 } |
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387 |
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388 // Cannot hit a safepoint in this function because the "this" pointer can move. |
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389 No_Safepoint_Verifier nsv; |
| 0 | 390 |
| 6162 | 391 // Check if the symbol table has been rehashed, if so, need to recalculate |
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392 // the hash value and index. |
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393 unsigned int hashValue; |
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394 int index; |
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395 if (use_alternate_hashcode()) { |
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396 hashValue = hash_symbol((const char*)name, len); |
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397 index = hash_to_index(hashValue); |
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398 } else { |
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399 hashValue = hashValue_arg; |
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400 index = index_arg; |
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401 } |
| 6162 | 402 |
| 0 | 403 // Since look-up was done lock-free, we need to check if another |
| 404 // thread beat us in the race to insert the symbol. | |
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405 Symbol* test = lookup(index, (char*)name, len, hashValue); |
| 0 | 406 if (test != NULL) { |
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407 // A race occurred and another thread introduced the symbol. |
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408 assert(test->refcount() != 0, "lookup should have incremented the count"); |
| 0 | 409 return test; |
| 410 } | |
| 411 | |
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412 // Create a new symbol. |
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413 Symbol* sym = allocate_symbol(name, len, c_heap, CHECK_NULL); |
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414 assert(sym->equals((char*)name, len), "symbol must be properly initialized"); |
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415 |
| 6197 | 416 HashtableEntry<Symbol*, mtSymbol>* entry = new_entry(hashValue, sym); |
| 0 | 417 add_entry(index, entry); |
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418 return sym; |
| 0 | 419 } |
| 420 | |
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421 // This version of basic_add adds symbols in batch from the constant pool |
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422 // parsing. |
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423 bool SymbolTable::basic_add(ClassLoaderData* loader_data, constantPoolHandle cp, |
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424 int names_count, |
| 0 | 425 const char** names, int* lengths, |
| 426 int* cp_indices, unsigned int* hashValues, | |
| 427 TRAPS) { | |
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428 |
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429 // Check symbol names are not too long. If any are too long, don't add any. |
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430 for (int i = 0; i< names_count; i++) { |
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431 if (lengths[i] > Symbol::max_length()) { |
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432 THROW_MSG_0(vmSymbols::java_lang_InternalError(), |
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433 "name is too long to represent"); |
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434 } |
| 0 | 435 } |
| 436 | |
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437 // Cannot hit a safepoint in this function because the "this" pointer can move. |
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438 No_Safepoint_Verifier nsv; |
| 0 | 439 |
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440 for (int i=0; i<names_count; i++) { |
| 6162 | 441 // Check if the symbol table has been rehashed, if so, need to recalculate |
| 442 // the hash value. | |
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443 unsigned int hashValue; |
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444 if (use_alternate_hashcode()) { |
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445 hashValue = hash_symbol(names[i], lengths[i]); |
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446 } else { |
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447 hashValue = hashValues[i]; |
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448 } |
| 0 | 449 // Since look-up was done lock-free, we need to check if another |
| 450 // thread beat us in the race to insert the symbol. | |
| 6162 | 451 int index = hash_to_index(hashValue); |
| 452 Symbol* test = lookup(index, names[i], lengths[i], hashValue); | |
| 0 | 453 if (test != NULL) { |
| 605 | 454 // A race occurred and another thread introduced the symbol, this one |
| 0 | 455 // will be dropped and collected. Use test instead. |
| 456 cp->symbol_at_put(cp_indices[i], test); | |
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457 assert(test->refcount() != 0, "lookup should have incremented the count"); |
| 0 | 458 } else { |
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459 // Create a new symbol. The null class loader is never unloaded so these |
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460 // are allocated specially in a permanent arena. |
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461 bool c_heap = !loader_data->is_the_null_class_loader_data(); |
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462 Symbol* sym = allocate_symbol((const u1*)names[i], lengths[i], c_heap, CHECK_(false)); |
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463 assert(sym->equals(names[i], lengths[i]), "symbol must be properly initialized"); // why wouldn't it be??? |
| 6197 | 464 HashtableEntry<Symbol*, mtSymbol>* entry = new_entry(hashValue, sym); |
| 0 | 465 add_entry(index, entry); |
| 466 cp->symbol_at_put(cp_indices[i], sym); | |
| 467 } | |
| 468 } | |
| 469 return true; | |
| 470 } | |
| 471 | |
| 472 | |
| 473 void SymbolTable::verify() { | |
| 474 for (int i = 0; i < the_table()->table_size(); ++i) { | |
| 6197 | 475 HashtableEntry<Symbol*, mtSymbol>* p = the_table()->bucket(i); |
| 0 | 476 for ( ; p != NULL; p = p->next()) { |
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477 Symbol* s = (Symbol*)(p->literal()); |
| 0 | 478 guarantee(s != NULL, "symbol is NULL"); |
| 479 unsigned int h = hash_symbol((char*)s->bytes(), s->utf8_length()); | |
| 480 guarantee(p->hash() == h, "broken hash in symbol table entry"); | |
| 481 guarantee(the_table()->hash_to_index(h) == i, | |
| 482 "wrong index in symbol table"); | |
| 483 } | |
| 484 } | |
| 485 } | |
| 486 | |
| 6162 | 487 void SymbolTable::dump(outputStream* st) { |
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488 the_table()->dump_table(st, "SymbolTable"); |
| 6162 | 489 } |
| 490 | |
| 0 | 491 |
| 492 //--------------------------------------------------------------------------- | |
| 493 // Non-product code | |
| 494 | |
| 495 #ifndef PRODUCT | |
| 496 | |
| 497 void SymbolTable::print_histogram() { | |
| 498 MutexLocker ml(SymbolTable_lock); | |
| 499 const int results_length = 100; | |
| 500 int results[results_length]; | |
| 501 int i,j; | |
| 502 | |
| 503 // initialize results to zero | |
| 504 for (j = 0; j < results_length; j++) { | |
| 505 results[j] = 0; | |
| 506 } | |
| 507 | |
| 508 int total = 0; | |
| 509 int max_symbols = 0; | |
| 510 int out_of_range = 0; | |
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511 int memory_total = 0; |
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512 int count = 0; |
| 0 | 513 for (i = 0; i < the_table()->table_size(); i++) { |
| 6197 | 514 HashtableEntry<Symbol*, mtSymbol>* p = the_table()->bucket(i); |
| 0 | 515 for ( ; p != NULL; p = p->next()) { |
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516 memory_total += p->literal()->size(); |
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517 count++; |
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518 int counter = p->literal()->utf8_length(); |
| 0 | 519 total += counter; |
| 520 if (counter < results_length) { | |
| 521 results[counter]++; | |
| 522 } else { | |
| 523 out_of_range++; | |
| 524 } | |
| 525 max_symbols = MAX2(max_symbols, counter); | |
| 526 } | |
| 527 } | |
| 528 tty->print_cr("Symbol Table:"); | |
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529 tty->print_cr("Total number of symbols %5d", count); |
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530 tty->print_cr("Total size in memory %5dK", |
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531 (memory_total*HeapWordSize)/1024); |
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532 tty->print_cr("Total counted %5d", _symbols_counted); |
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533 tty->print_cr("Total removed %5d", _symbols_removed); |
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534 if (_symbols_counted > 0) { |
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535 tty->print_cr("Percent removed %3.2f", |
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536 ((float)_symbols_removed/(float)_symbols_counted)* 100); |
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537 } |
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538 tty->print_cr("Reference counts %5d", Symbol::_total_count); |
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539 tty->print_cr("Symbol arena size %5d used %5d", |
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540 arena()->size_in_bytes(), arena()->used()); |
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541 tty->print_cr("Histogram of symbol length:"); |
| 0 | 542 tty->print_cr("%8s %5d", "Total ", total); |
| 543 tty->print_cr("%8s %5d", "Maximum", max_symbols); | |
| 544 tty->print_cr("%8s %3.2f", "Average", | |
| 545 ((float) total / (float) the_table()->table_size())); | |
| 546 tty->print_cr("%s", "Histogram:"); | |
| 547 tty->print_cr(" %s %29s", "Length", "Number chains that length"); | |
| 548 for (i = 0; i < results_length; i++) { | |
| 549 if (results[i] > 0) { | |
| 550 tty->print_cr("%6d %10d", i, results[i]); | |
| 551 } | |
| 552 } | |
|
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553 if (Verbose) { |
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554 int line_length = 70; |
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555 tty->print_cr("%s %30s", " Length", "Number chains that length"); |
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556 for (i = 0; i < results_length; i++) { |
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557 if (results[i] > 0) { |
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558 tty->print("%4d", i); |
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559 for (j = 0; (j < results[i]) && (j < line_length); j++) { |
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560 tty->print("%1s", "*"); |
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561 } |
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562 if (j == line_length) { |
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563 tty->print("%1s", "+"); |
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564 } |
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565 tty->cr(); |
| 0 | 566 } |
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567 } |
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568 } |
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569 tty->print_cr(" %s %d: %d\n", "Number chains longer than", |
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570 results_length, out_of_range); |
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571 } |
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572 |
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573 void SymbolTable::print() { |
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574 for (int i = 0; i < the_table()->table_size(); ++i) { |
| 6197 | 575 HashtableEntry<Symbol*, mtSymbol>** p = the_table()->bucket_addr(i); |
| 576 HashtableEntry<Symbol*, mtSymbol>* entry = the_table()->bucket(i); | |
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577 if (entry != NULL) { |
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578 while (entry != NULL) { |
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579 tty->print(PTR_FORMAT " ", entry->literal()); |
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580 entry->literal()->print(); |
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581 tty->print(" %d", entry->literal()->refcount()); |
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582 p = entry->next_addr(); |
| 6197 | 583 entry = (HashtableEntry<Symbol*, mtSymbol>*)HashtableEntry<Symbol*, mtSymbol>::make_ptr(*p); |
| 0 | 584 } |
| 585 tty->cr(); | |
| 586 } | |
| 587 } | |
| 588 } | |
| 589 #endif // PRODUCT | |
| 590 | |
| 591 // -------------------------------------------------------------------------- | |
| 592 | |
| 593 #ifdef ASSERT | |
| 594 class StableMemoryChecker : public StackObj { | |
| 595 enum { _bufsize = wordSize*4 }; | |
| 596 | |
| 597 address _region; | |
| 598 jint _size; | |
| 599 u1 _save_buf[_bufsize]; | |
| 600 | |
| 601 int sample(u1* save_buf) { | |
| 602 if (_size <= _bufsize) { | |
| 603 memcpy(save_buf, _region, _size); | |
| 604 return _size; | |
| 605 } else { | |
| 606 // copy head and tail | |
| 607 memcpy(&save_buf[0], _region, _bufsize/2); | |
| 608 memcpy(&save_buf[_bufsize/2], _region + _size - _bufsize/2, _bufsize/2); | |
| 609 return (_bufsize/2)*2; | |
| 610 } | |
| 611 } | |
| 612 | |
| 613 public: | |
| 614 StableMemoryChecker(const void* region, jint size) { | |
| 615 _region = (address) region; | |
| 616 _size = size; | |
| 617 sample(_save_buf); | |
| 618 } | |
| 619 | |
| 620 bool verify() { | |
| 621 u1 check_buf[sizeof(_save_buf)]; | |
| 622 int check_size = sample(check_buf); | |
| 623 return (0 == memcmp(_save_buf, check_buf, check_size)); | |
| 624 } | |
| 625 | |
| 626 void set_region(const void* region) { _region = (address) region; } | |
| 627 }; | |
| 628 #endif | |
| 629 | |
| 630 | |
| 631 // -------------------------------------------------------------------------- | |
| 632 StringTable* StringTable::_the_table = NULL; | |
| 633 | |
| 6162 | 634 bool StringTable::_needs_rehashing = false; |
| 635 | |
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636 volatile int StringTable::_parallel_claimed_idx = 0; |
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637 |
| 6162 | 638 // Pick hashing algorithm |
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639 unsigned int StringTable::hash_string(const jchar* s, int len) { |
| 6162 | 640 return use_alternate_hashcode() ? AltHashing::murmur3_32(seed(), s, len) : |
|
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641 java_lang_String::hash_code(s, len); |
| 6162 | 642 } |
| 643 | |
| 0 | 644 oop StringTable::lookup(int index, jchar* name, |
| 645 int len, unsigned int hash) { | |
| 6162 | 646 int count = 0; |
| 6197 | 647 for (HashtableEntry<oop, mtSymbol>* l = bucket(index); l != NULL; l = l->next()) { |
| 6162 | 648 count++; |
| 0 | 649 if (l->hash() == hash) { |
| 650 if (java_lang_String::equals(l->literal(), name, len)) { | |
| 651 return l->literal(); | |
| 652 } | |
| 653 } | |
| 654 } | |
| 6162 | 655 // If the bucket size is too deep check if this hash code is insufficient. |
| 6197 | 656 if (count >= BasicHashtable<mtSymbol>::rehash_count && !needs_rehashing()) { |
| 6162 | 657 _needs_rehashing = check_rehash_table(count); |
| 658 } | |
| 0 | 659 return NULL; |
| 660 } | |
| 661 | |
| 662 | |
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663 oop StringTable::basic_add(int index_arg, Handle string, jchar* name, |
| 6162 | 664 int len, unsigned int hashValue_arg, TRAPS) { |
| 0 | 665 |
| 666 assert(java_lang_String::equals(string(), name, len), | |
| 667 "string must be properly initialized"); | |
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668 // Cannot hit a safepoint in this function because the "this" pointer can move. |
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669 No_Safepoint_Verifier nsv; |
| 0 | 670 |
| 6162 | 671 // Check if the symbol table has been rehashed, if so, need to recalculate |
|
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672 // the hash value and index before second lookup. |
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673 unsigned int hashValue; |
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674 int index; |
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675 if (use_alternate_hashcode()) { |
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676 hashValue = hash_string(name, len); |
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677 index = hash_to_index(hashValue); |
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678 } else { |
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679 hashValue = hashValue_arg; |
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680 index = index_arg; |
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681 } |
| 6162 | 682 |
| 0 | 683 // Since look-up was done lock-free, we need to check if another |
| 684 // thread beat us in the race to insert the symbol. | |
| 685 | |
| 686 oop test = lookup(index, name, len, hashValue); // calls lookup(u1*, int) | |
| 687 if (test != NULL) { | |
| 688 // Entry already added | |
| 689 return test; | |
| 690 } | |
| 691 | |
| 6197 | 692 HashtableEntry<oop, mtSymbol>* entry = new_entry(hashValue, string()); |
| 0 | 693 add_entry(index, entry); |
| 694 return string(); | |
| 695 } | |
| 696 | |
| 697 | |
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698 oop StringTable::lookup(Symbol* symbol) { |
| 0 | 699 ResourceMark rm; |
| 700 int length; | |
| 701 jchar* chars = symbol->as_unicode(length); | |
| 8850 | 702 return lookup(chars, length); |
| 703 } | |
| 704 | |
| 705 | |
| 706 oop StringTable::lookup(jchar* name, int len) { | |
| 707 unsigned int hash = hash_string(name, len); | |
| 708 int index = the_table()->hash_to_index(hash); | |
| 709 return the_table()->lookup(index, name, len, hash); | |
| 0 | 710 } |
| 711 | |
| 712 | |
| 713 oop StringTable::intern(Handle string_or_null, jchar* name, | |
| 714 int len, TRAPS) { | |
| 6162 | 715 unsigned int hashValue = hash_string(name, len); |
| 0 | 716 int index = the_table()->hash_to_index(hashValue); |
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717 oop found_string = the_table()->lookup(index, name, len, hashValue); |
| 0 | 718 |
| 719 // Found | |
|
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720 if (found_string != NULL) return found_string; |
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721 |
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722 debug_only(StableMemoryChecker smc(name, len * sizeof(name[0]))); |
| 12301 | 723 assert(!Universe::heap()->is_in_reserved(name), |
|
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724 "proposed name of symbol must be stable"); |
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725 |
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726 Handle string; |
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727 // try to reuse the string if possible |
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728 if (!string_or_null.is_null()) { |
|
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729 string = string_or_null; |
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730 } else { |
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731 string = java_lang_String::create_from_unicode(name, len, CHECK_NULL); |
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732 } |
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733 |
| 17764 | 734 #if INCLUDE_ALL_GCS |
| 735 if (G1StringDedup::is_enabled()) { | |
| 736 // Deduplicate the string before it is interned. Note that we should never | |
| 737 // deduplicate a string after it has been interned. Doing so will counteract | |
| 738 // compiler optimizations done on e.g. interned string literals. | |
| 739 G1StringDedup::deduplicate(string()); | |
| 740 } | |
| 741 #endif | |
| 742 | |
|
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743 // Grab the StringTable_lock before getting the_table() because it could |
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744 // change at safepoint. |
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745 MutexLocker ml(StringTable_lock, THREAD); |
| 0 | 746 |
| 747 // Otherwise, add to symbol to table | |
|
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748 return the_table()->basic_add(index, string, name, len, |
| 0 | 749 hashValue, CHECK_NULL); |
| 750 } | |
| 751 | |
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752 oop StringTable::intern(Symbol* symbol, TRAPS) { |
| 0 | 753 if (symbol == NULL) return NULL; |
| 754 ResourceMark rm(THREAD); | |
| 755 int length; | |
| 756 jchar* chars = symbol->as_unicode(length); | |
| 757 Handle string; | |
| 758 oop result = intern(string, chars, length, CHECK_NULL); | |
| 759 return result; | |
| 760 } | |
| 761 | |
| 762 | |
| 763 oop StringTable::intern(oop string, TRAPS) | |
| 764 { | |
| 765 if (string == NULL) return NULL; | |
| 766 ResourceMark rm(THREAD); | |
| 767 int length; | |
| 768 Handle h_string (THREAD, string); | |
|
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769 jchar* chars = java_lang_String::as_unicode_string(string, length, CHECK_NULL); |
| 0 | 770 oop result = intern(h_string, chars, length, CHECK_NULL); |
| 771 return result; | |
| 772 } | |
| 773 | |
| 774 | |
| 775 oop StringTable::intern(const char* utf8_string, TRAPS) { | |
| 776 if (utf8_string == NULL) return NULL; | |
| 777 ResourceMark rm(THREAD); | |
| 778 int length = UTF8::unicode_length(utf8_string); | |
| 779 jchar* chars = NEW_RESOURCE_ARRAY(jchar, length); | |
| 780 UTF8::convert_to_unicode(utf8_string, chars, length); | |
| 781 Handle string; | |
| 782 oop result = intern(string, chars, length, CHECK_NULL); | |
| 783 return result; | |
| 784 } | |
| 785 | |
|
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786 void StringTable::unlink_or_oops_do(BoolObjectClosure* is_alive, OopClosure* f, int* processed, int* removed) { |
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787 buckets_unlink_or_oops_do(is_alive, f, 0, the_table()->table_size(), processed, removed); |
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788 } |
|
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789 |
|
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790 void StringTable::possibly_parallel_unlink_or_oops_do(BoolObjectClosure* is_alive, OopClosure* f, int* processed, int* removed) { |
|
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791 // Readers of the table are unlocked, so we should only be removing |
|
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792 // entries at a safepoint. |
|
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793 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
|
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794 const int limit = the_table()->table_size(); |
|
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795 |
|
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796 for (;;) { |
|
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797 // Grab next set of buckets to scan |
|
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798 int start_idx = Atomic::add(ClaimChunkSize, &_parallel_claimed_idx) - ClaimChunkSize; |
|
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799 if (start_idx >= limit) { |
|
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800 // End of table |
|
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801 break; |
|
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|
802 } |
|
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803 |
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804 int end_idx = MIN2(limit, start_idx + ClaimChunkSize); |
|
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805 buckets_unlink_or_oops_do(is_alive, f, start_idx, end_idx, processed, removed); |
|
2177
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|
806 } |
|
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|
807 } |
|
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|
808 |
|
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809 void StringTable::buckets_oops_do(OopClosure* f, int start_idx, int end_idx) { |
|
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810 const int limit = the_table()->table_size(); |
|
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811 |
|
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812 assert(0 <= start_idx && start_idx <= limit, |
|
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813 err_msg("start_idx (" INT32_FORMAT ") is out of bounds", start_idx)); |
|
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814 assert(0 <= end_idx && end_idx <= limit, |
|
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815 err_msg("end_idx (" INT32_FORMAT ") is out of bounds", end_idx)); |
|
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816 assert(start_idx <= end_idx, |
|
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817 err_msg("Index ordering: start_idx=" INT32_FORMAT", end_idx=" INT32_FORMAT, |
|
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|
818 start_idx, end_idx)); |
|
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|
819 |
|
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|
820 for (int i = start_idx; i < end_idx; i += 1) { |
| 6197 | 821 HashtableEntry<oop, mtSymbol>* entry = the_table()->bucket(i); |
|
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|
822 while (entry != NULL) { |
|
10362
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|
823 assert(!entry->is_shared(), "CDS not used for the StringTable"); |
|
95c00927be11
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|
824 |
|
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|
825 f->do_oop((oop*)entry->literal_addr()); |
|
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|
826 |
|
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diff
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|
827 entry = entry->next(); |
|
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|
828 } |
|
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|
829 } |
|
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|
830 } |
|
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|
831 |
|
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|
832 void StringTable::buckets_unlink_or_oops_do(BoolObjectClosure* is_alive, OopClosure* f, int start_idx, int end_idx, int* processed, int* removed) { |
|
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833 const int limit = the_table()->table_size(); |
|
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|
834 |
|
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|
835 assert(0 <= start_idx && start_idx <= limit, |
|
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|
836 err_msg("start_idx (" INT32_FORMAT ") is out of bounds", start_idx)); |
|
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|
837 assert(0 <= end_idx && end_idx <= limit, |
|
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|
838 err_msg("end_idx (" INT32_FORMAT ") is out of bounds", end_idx)); |
|
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|
839 assert(start_idx <= end_idx, |
|
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840 err_msg("Index ordering: start_idx=" INT32_FORMAT", end_idx=" INT32_FORMAT, |
|
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|
841 start_idx, end_idx)); |
|
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|
842 |
|
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|
843 for (int i = start_idx; i < end_idx; ++i) { |
|
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|
844 HashtableEntry<oop, mtSymbol>** p = the_table()->bucket_addr(i); |
|
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|
845 HashtableEntry<oop, mtSymbol>* entry = the_table()->bucket(i); |
|
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846 while (entry != NULL) { |
|
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|
847 assert(!entry->is_shared(), "CDS not used for the StringTable"); |
|
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|
848 |
|
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|
849 if (is_alive->do_object_b(entry->literal())) { |
|
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|
850 if (f != NULL) { |
|
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|
851 f->do_oop((oop*)entry->literal_addr()); |
|
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|
852 } |
|
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|
853 p = entry->next_addr(); |
|
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|
854 } else { |
|
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|
855 *p = entry->next(); |
|
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|
856 the_table()->free_entry(entry); |
|
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|
857 (*removed)++; |
|
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parents:
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diff
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|
858 } |
|
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|
859 (*processed)++; |
|
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|
860 entry = *p; |
|
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|
861 } |
|
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|
862 } |
|
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|
863 } |
|
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|
864 |
|
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|
865 void StringTable::oops_do(OopClosure* f) { |
|
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|
866 buckets_oops_do(f, 0, the_table()->table_size()); |
|
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|
867 } |
|
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parents:
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diff
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|
868 |
|
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diff
changeset
|
869 void StringTable::possibly_parallel_oops_do(OopClosure* f) { |
|
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|
870 const int limit = the_table()->table_size(); |
|
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|
871 |
|
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parents:
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|
872 for (;;) { |
|
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|
873 // Grab next set of buckets to scan |
|
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|
874 int start_idx = Atomic::add(ClaimChunkSize, &_parallel_claimed_idx) - ClaimChunkSize; |
|
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|
875 if (start_idx >= limit) { |
|
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diff
changeset
|
876 // End of table |
|
01522ca68fc7
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|
877 break; |
|
01522ca68fc7
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|
878 } |
|
01522ca68fc7
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|
879 |
|
01522ca68fc7
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|
880 int end_idx = MIN2(limit, start_idx + ClaimChunkSize); |
|
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|
881 buckets_oops_do(f, start_idx, end_idx); |
|
10991
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|
882 } |
|
01522ca68fc7
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|
883 } |
|
01522ca68fc7
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|
884 |
|
12275
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diff
changeset
|
885 // This verification is part of Universe::verify() and needs to be quick. |
|
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diff
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|
886 // See StringTable::verify_and_compare() below for exhaustive verification. |
| 0 | 887 void StringTable::verify() { |
| 888 for (int i = 0; i < the_table()->table_size(); ++i) { | |
| 6197 | 889 HashtableEntry<oop, mtSymbol>* p = the_table()->bucket(i); |
| 0 | 890 for ( ; p != NULL; p = p->next()) { |
| 891 oop s = p->literal(); | |
| 892 guarantee(s != NULL, "interned string is NULL"); | |
|
2418
352622fd140a
7032129: Native memory usage grow unexpectedly for vm/oom/*InternedString tests
never
parents:
2379
diff
changeset
|
893 unsigned int h = java_lang_String::hash_string(s); |
| 0 | 894 guarantee(p->hash() == h, "broken hash in string table entry"); |
| 895 guarantee(the_table()->hash_to_index(h) == i, | |
| 896 "wrong index in string table"); | |
| 897 } | |
| 898 } | |
| 899 } | |
| 6162 | 900 |
| 901 void StringTable::dump(outputStream* st) { | |
|
10312
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8014262: PrintStringTableStatistics should include more footprint info
iklam
parents:
10155
diff
changeset
|
902 the_table()->dump_table(st, "StringTable"); |
| 6162 | 903 } |
| 904 | |
|
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diff
changeset
|
905 StringTable::VerifyRetTypes StringTable::compare_entries( |
|
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|
906 int bkt1, int e_cnt1, |
|
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|
907 HashtableEntry<oop, mtSymbol>* e_ptr1, |
|
63147986a428
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diff
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|
908 int bkt2, int e_cnt2, |
|
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|
909 HashtableEntry<oop, mtSymbol>* e_ptr2) { |
|
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diff
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|
910 // These entries are sanity checked by verify_and_compare_entries() |
|
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|
911 // before this function is called. |
|
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|
912 oop str1 = e_ptr1->literal(); |
|
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|
913 oop str2 = e_ptr2->literal(); |
|
63147986a428
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|
914 |
|
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|
915 if (str1 == str2) { |
|
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diff
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|
916 tty->print_cr("ERROR: identical oop values (0x" PTR_FORMAT ") " |
|
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diff
changeset
|
917 "in entry @ bucket[%d][%d] and entry @ bucket[%d][%d]", |
|
12316
190899198332
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
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diff
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|
918 (void *)str1, bkt1, e_cnt1, bkt2, e_cnt2); |
|
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|
919 return _verify_fail_continue; |
|
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diff
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|
920 } |
|
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|
921 |
|
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diff
changeset
|
922 if (java_lang_String::equals(str1, str2)) { |
|
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|
923 tty->print_cr("ERROR: identical String values in entry @ " |
|
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|
924 "bucket[%d][%d] and entry @ bucket[%d][%d]", |
|
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|
925 bkt1, e_cnt1, bkt2, e_cnt2); |
|
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diff
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|
926 return _verify_fail_continue; |
|
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diff
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|
927 } |
|
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diff
changeset
|
928 |
|
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diff
changeset
|
929 return _verify_pass; |
|
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diff
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|
930 } |
|
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diff
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|
931 |
|
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changeset
|
932 StringTable::VerifyRetTypes StringTable::verify_entry(int bkt, int e_cnt, |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
933 HashtableEntry<oop, mtSymbol>* e_ptr, |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
934 StringTable::VerifyMesgModes mesg_mode) { |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
935 |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
936 VerifyRetTypes ret = _verify_pass; // be optimistic |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
937 |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
938 oop str = e_ptr->literal(); |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
939 if (str == NULL) { |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
940 if (mesg_mode == _verify_with_mesgs) { |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
941 tty->print_cr("ERROR: NULL oop value in entry @ bucket[%d][%d]", bkt, |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
942 e_cnt); |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
943 } |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
944 // NULL oop means no more verifications are possible |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
945 return _verify_fail_done; |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
946 } |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
947 |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
948 if (str->klass() != SystemDictionary::String_klass()) { |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
949 if (mesg_mode == _verify_with_mesgs) { |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
950 tty->print_cr("ERROR: oop is not a String in entry @ bucket[%d][%d]", |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
951 bkt, e_cnt); |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
952 } |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
953 // not a String means no more verifications are possible |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
954 return _verify_fail_done; |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
955 } |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
956 |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
957 unsigned int h = java_lang_String::hash_string(str); |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
958 if (e_ptr->hash() != h) { |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
959 if (mesg_mode == _verify_with_mesgs) { |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
960 tty->print_cr("ERROR: broken hash value in entry @ bucket[%d][%d], " |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
961 "bkt_hash=%d, str_hash=%d", bkt, e_cnt, e_ptr->hash(), h); |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
962 } |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
963 ret = _verify_fail_continue; |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
964 } |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
965 |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
966 if (the_table()->hash_to_index(h) != bkt) { |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
967 if (mesg_mode == _verify_with_mesgs) { |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
968 tty->print_cr("ERROR: wrong index value for entry @ bucket[%d][%d], " |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
969 "str_hash=%d, hash_to_index=%d", bkt, e_cnt, h, |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
970 the_table()->hash_to_index(h)); |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
971 } |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
972 ret = _verify_fail_continue; |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
973 } |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
974 |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
975 return ret; |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
976 } |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
977 |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
978 // See StringTable::verify() above for the quick verification that is |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
979 // part of Universe::verify(). This verification is exhaustive and |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
980 // reports on every issue that is found. StringTable::verify() only |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
981 // reports on the first issue that is found. |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
982 // |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
983 // StringTable::verify_entry() checks: |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
984 // - oop value != NULL (same as verify()) |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
985 // - oop value is a String |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
986 // - hash(String) == hash in entry (same as verify()) |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
987 // - index for hash == index of entry (same as verify()) |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
988 // |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
989 // StringTable::compare_entries() checks: |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
990 // - oops are unique across all entries |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
991 // - String values are unique across all entries |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
992 // |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
993 int StringTable::verify_and_compare_entries() { |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
994 assert(StringTable_lock->is_locked(), "sanity check"); |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
995 |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
996 int fail_cnt = 0; |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
997 |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
998 // first, verify all the entries individually: |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
999 for (int bkt = 0; bkt < the_table()->table_size(); bkt++) { |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1000 HashtableEntry<oop, mtSymbol>* e_ptr = the_table()->bucket(bkt); |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1001 for (int e_cnt = 0; e_ptr != NULL; e_ptr = e_ptr->next(), e_cnt++) { |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1002 VerifyRetTypes ret = verify_entry(bkt, e_cnt, e_ptr, _verify_with_mesgs); |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1003 if (ret != _verify_pass) { |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1004 fail_cnt++; |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1005 } |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1006 } |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1007 } |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1008 |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1009 // Optimization: if the above check did not find any failures, then |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1010 // the comparison loop below does not need to call verify_entry() |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1011 // before calling compare_entries(). If there were failures, then we |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1012 // have to call verify_entry() to see if the entry can be passed to |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1013 // compare_entries() safely. When we call verify_entry() in the loop |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1014 // below, we do so quietly to void duplicate messages and we don't |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1015 // increment fail_cnt because the failures have already been counted. |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1016 bool need_entry_verify = (fail_cnt != 0); |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1017 |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1018 // second, verify all entries relative to each other: |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1019 for (int bkt1 = 0; bkt1 < the_table()->table_size(); bkt1++) { |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1020 HashtableEntry<oop, mtSymbol>* e_ptr1 = the_table()->bucket(bkt1); |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1021 for (int e_cnt1 = 0; e_ptr1 != NULL; e_ptr1 = e_ptr1->next(), e_cnt1++) { |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1022 if (need_entry_verify) { |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1023 VerifyRetTypes ret = verify_entry(bkt1, e_cnt1, e_ptr1, |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1024 _verify_quietly); |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1025 if (ret == _verify_fail_done) { |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1026 // cannot use the current entry to compare against other entries |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1027 continue; |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1028 } |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1029 } |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1030 |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1031 for (int bkt2 = bkt1; bkt2 < the_table()->table_size(); bkt2++) { |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1032 HashtableEntry<oop, mtSymbol>* e_ptr2 = the_table()->bucket(bkt2); |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1033 int e_cnt2; |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1034 for (e_cnt2 = 0; e_ptr2 != NULL; e_ptr2 = e_ptr2->next(), e_cnt2++) { |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1035 if (bkt1 == bkt2 && e_cnt2 <= e_cnt1) { |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1036 // skip the entries up to and including the one that |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1037 // we're comparing against |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1038 continue; |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1039 } |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1040 |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1041 if (need_entry_verify) { |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1042 VerifyRetTypes ret = verify_entry(bkt2, e_cnt2, e_ptr2, |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1043 _verify_quietly); |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1044 if (ret == _verify_fail_done) { |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1045 // cannot compare against this entry |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1046 continue; |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1047 } |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1048 } |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1049 |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1050 // compare two entries, report and count any failures: |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1051 if (compare_entries(bkt1, e_cnt1, e_ptr1, bkt2, e_cnt2, e_ptr2) |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1052 != _verify_pass) { |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1053 fail_cnt++; |
|
63147986a428
8019835: Strings interned in different threads equal but does not ==
dcubed
parents:
10991
diff
changeset
|
1054 } |
|
63147986a428
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1055 } |
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1056 } |
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1057 } |
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1058 } |
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1059 return fail_cnt; |
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1060 } |
| 6162 | 1061 |
| 1062 // Create a new table and using alternate hash code, populate the new table | |
| 1063 // with the existing strings. Set flag to use the alternate hash code afterwards. | |
| 1064 void StringTable::rehash_table() { | |
| 1065 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
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1066 // This should never happen with -Xshare:dump but it might in testing mode. |
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1067 if (DumpSharedSpaces) return; |
| 6162 | 1068 StringTable* new_table = new StringTable(); |
| 1069 | |
| 1070 // Rehash the table | |
| 1071 the_table()->move_to(new_table); | |
| 1072 | |
| 1073 // Delete the table and buckets (entries are reused in new table). | |
| 1074 delete _the_table; | |
| 1075 // Don't check if we need rehashing until the table gets unbalanced again. | |
| 1076 // Then rehash with a new global seed. | |
| 1077 _needs_rehashing = false; | |
| 1078 _the_table = new_table; | |
| 1079 } |