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annotate src/share/vm/classfile/symbolTable.cpp @ 4916:1b0e0f8be510

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7131006: java/lang/management/ThreadMXBean/ThreadLists.java Reviewed-by: dholmes, acorn
author minqi
date Thu, 09 Feb 2012 00:51:47 -0800
parents 94ec88ca68e2
children fc9d8850ab8b
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1 /*
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2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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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.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26 #include "classfile/javaClasses.hpp"
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27 #include "classfile/symbolTable.hpp"
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28 #include "classfile/systemDictionary.hpp"
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29 #include "gc_interface/collectedHeap.inline.hpp"
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30 #include "memory/filemap.hpp"
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31 #include "memory/gcLocker.inline.hpp"
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32 #include "oops/oop.inline.hpp"
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33 #include "oops/oop.inline2.hpp"
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34 #include "runtime/mutexLocker.hpp"
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35 #include "utilities/hashtable.inline.hpp"
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37 // --------------------------------------------------------------------------
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38
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39 SymbolTable* SymbolTable::_the_table = NULL;
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40
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41 Symbol* SymbolTable::allocate_symbol(const u1* name, int len, TRAPS) {
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42 // Don't allow symbols to be created which cannot fit in a Symbol*.
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43 if (len > Symbol::max_length()) {
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44 THROW_MSG_0(vmSymbols::java_lang_InternalError(),
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45 "name is too long to represent");
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46 }
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47 Symbol* sym = new (len) Symbol(name, len);
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48 assert(sym != NULL, "new should call vm_exit_out_of_memory if C_HEAP is exhausted");
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49 return sym;
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50 }
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51
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52 bool SymbolTable::allocate_symbols(int names_count, const u1** names,
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53 int* lengths, Symbol** syms, TRAPS) {
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54 for (int i = 0; i< names_count; i++) {
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55 if (lengths[i] > Symbol::max_length()) {
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56 THROW_MSG_0(vmSymbols::java_lang_InternalError(),
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57 "name is too long to represent");
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58 }
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59 }
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60
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61 for (int i = 0; i< names_count; i++) {
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62 int len = lengths[i];
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63 syms[i] = new (len) Symbol(names[i], len);
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64 assert(syms[i] != NULL, "new should call vm_exit_out_of_memory if "
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65 "C_HEAP is exhausted");
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66 }
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67 return true;
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68 }
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69
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70 // Call function for all symbols in the symbol table.
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71 void SymbolTable::symbols_do(SymbolClosure *cl) {
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72 const int n = the_table()->table_size();
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73 for (int i = 0; i < n; i++) {
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74 for (HashtableEntry<Symbol*>* p = the_table()->bucket(i);
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75 p != NULL;
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76 p = p->next()) {
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77 cl->do_symbol(p->literal_addr());
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78 }
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79 }
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80 }
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81
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82 int SymbolTable::symbols_removed = 0;
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83 int SymbolTable::symbols_counted = 0;
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84
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85 // Remove unreferenced symbols from the symbol table
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86 // This is done late during GC. This doesn't use the hash table unlink because
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87 // it assumes that the literals are oops.
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88 void SymbolTable::unlink() {
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89 int removed = 0;
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90 int total = 0;
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91 size_t memory_total = 0;
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92 for (int i = 0; i < the_table()->table_size(); ++i) {
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93 for (HashtableEntry<Symbol*>** p = the_table()->bucket_addr(i); *p != NULL; ) {
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94 HashtableEntry<Symbol*>* entry = *p;
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95 if (entry->is_shared()) {
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96 break;
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97 }
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98 Symbol* s = entry->literal();
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99 memory_total += s->object_size();
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100 total++;
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101 assert(s != NULL, "just checking");
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102 // If reference count is zero, remove.
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103 if (s->refcount() == 0) {
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104 delete s;
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105 removed++;
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106 *p = entry->next();
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107 the_table()->free_entry(entry);
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108 } else {
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109 p = entry->next_addr();
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110 }
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111 }
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112 }
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113 symbols_removed += removed;
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114 symbols_counted += total;
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115 // Exclude printing for normal PrintGCDetails because people parse
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116 // this output.
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117 if (PrintGCDetails && Verbose && WizardMode) {
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118 gclog_or_tty->print(" [Symbols=%d size=" SIZE_FORMAT "K] ", total,
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119 (memory_total*HeapWordSize)/1024);
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120 }
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121 }
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122
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123
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124 // Lookup a symbol in a bucket.
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125
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126 Symbol* SymbolTable::lookup(int index, const char* name,
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127 int len, unsigned int hash) {
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128 for (HashtableEntry<Symbol*>* e = bucket(index); e != NULL; e = e->next()) {
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129 if (e->hash() == hash) {
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130 Symbol* sym = e->literal();
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131 if (sym->equals(name, len)) {
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132 // something is referencing this symbol now.
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133 sym->increment_refcount();
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134 return sym;
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135 }
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136 }
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137 }
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138 return NULL;
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139 }
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140
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141
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142 // We take care not to be blocking while holding the
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143 // SymbolTable_lock. Otherwise, the system might deadlock, since the
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144 // symboltable is used during compilation (VM_thread) The lock free
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145 // synchronization is simplified by the fact that we do not delete
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146 // entries in the symbol table during normal execution (only during
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147 // safepoints).
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148
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149 Symbol* SymbolTable::lookup(const char* name, int len, TRAPS) {
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150 unsigned int hashValue = hash_symbol(name, len);
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151 int index = the_table()->hash_to_index(hashValue);
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152
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153 Symbol* s = the_table()->lookup(index, name, len, hashValue);
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154
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155 // Found
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156 if (s != NULL) return s;
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157
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158 // Otherwise, add to symbol to table
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159 return the_table()->basic_add(index, (u1*)name, len, hashValue, CHECK_NULL);
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160 }
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161
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162 Symbol* SymbolTable::lookup(const Symbol* sym, int begin, int end, TRAPS) {
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163 char* buffer;
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164 int index, len;
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165 unsigned int hashValue;
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166 char* name;
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167 {
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168 debug_only(No_Safepoint_Verifier nsv;)
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169
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170 name = (char*)sym->base() + begin;
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171 len = end - begin;
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172 hashValue = hash_symbol(name, len);
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173 index = the_table()->hash_to_index(hashValue);
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174 Symbol* s = the_table()->lookup(index, name, len, hashValue);
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175
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176 // Found
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177 if (s != NULL) return s;
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178 }
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179
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parents:
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180 // Otherwise, add to symbol to table. Copy to a C string first.
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181 char stack_buf[128];
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182 ResourceMark rm(THREAD);
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parents:
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183 if (len <= 128) {
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184 buffer = stack_buf;
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parents:
diff changeset
185 } else {
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parents:
diff changeset
186 buffer = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
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parents:
diff changeset
187 }
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parents:
diff changeset
188 for (int i=0; i<len; i++) {
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parents:
diff changeset
189 buffer[i] = name[i];
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parents:
diff changeset
190 }
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parents:
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191 // Make sure there is no safepoint in the code above since name can't move.
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parents:
diff changeset
192 // We can't include the code in No_Safepoint_Verifier because of the
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parents:
diff changeset
193 // ResourceMark.
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parents:
diff changeset
194
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parents:
diff changeset
195 return the_table()->basic_add(index, (u1*)buffer, len, hashValue, CHECK_NULL);
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196 }
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diff changeset
197
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diff changeset
198 Symbol* SymbolTable::lookup_only(const char* name, int len,
0
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parents:
diff changeset
199 unsigned int& hash) {
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200 hash = hash_symbol(name, len);
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parents:
diff changeset
201 int index = the_table()->hash_to_index(hash);
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diff changeset
202
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coleenp
parents: 1972
diff changeset
203 Symbol* s = the_table()->lookup(index, name, len, hash);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
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parents: 1972
diff changeset
204 return s;
0
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diff changeset
205 }
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diff changeset
206
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parents: 2418
diff changeset
207 // Look up the address of the literal in the SymbolTable for this Symbol*
94ec88ca68e2 7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents: 2418
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208 // Do not create any new symbols
94ec88ca68e2 7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents: 2418
diff changeset
209 // Do not increment the reference count to keep this alive
94ec88ca68e2 7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents: 2418
diff changeset
210 Symbol** SymbolTable::lookup_symbol_addr(Symbol* sym){
94ec88ca68e2 7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents: 2418
diff changeset
211 unsigned int hash = hash_symbol((char*)sym->bytes(), sym->utf8_length());
94ec88ca68e2 7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents: 2418
diff changeset
212 int index = the_table()->hash_to_index(hash);
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phh
parents: 2418
diff changeset
213
94ec88ca68e2 7115199: Add event tracing hooks and Java Flight Recorder infrastructure
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parents: 2418
diff changeset
214 for (HashtableEntry<Symbol*>* e = the_table()->bucket(index); e != NULL; e = e->next()) {
94ec88ca68e2 7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents: 2418
diff changeset
215 if (e->hash() == hash) {
94ec88ca68e2 7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents: 2418
diff changeset
216 Symbol* literal_sym = e->literal();
94ec88ca68e2 7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents: 2418
diff changeset
217 if (sym == literal_sym) {
94ec88ca68e2 7115199: Add event tracing hooks and Java Flight Recorder infrastructure
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parents: 2418
diff changeset
218 return e->literal_addr();
94ec88ca68e2 7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents: 2418
diff changeset
219 }
94ec88ca68e2 7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents: 2418
diff changeset
220 }
94ec88ca68e2 7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents: 2418
diff changeset
221 }
94ec88ca68e2 7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents: 2418
diff changeset
222 return NULL;
94ec88ca68e2 7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents: 2418
diff changeset
223 }
94ec88ca68e2 7115199: Add event tracing hooks and Java Flight Recorder infrastructure
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diff changeset
224
665
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parents: 605
diff changeset
225 // Suggestion: Push unicode-based lookup all the way into the hashing
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parents: 605
diff changeset
226 // and probing logic, so there is no need for convert_to_utf8 until
2177
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parents: 1972
diff changeset
227 // an actual new Symbol* is created.
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
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diff changeset
228 Symbol* SymbolTable::lookup_unicode(const jchar* name, int utf16_length, TRAPS) {
665
c89f86385056 6814659: separable cleanups and subroutines for 6655638
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parents: 605
diff changeset
229 int utf8_length = UNICODE::utf8_length((jchar*) name, utf16_length);
c89f86385056 6814659: separable cleanups and subroutines for 6655638
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parents: 605
diff changeset
230 char stack_buf[128];
c89f86385056 6814659: separable cleanups and subroutines for 6655638
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parents: 605
diff changeset
231 if (utf8_length < (int) sizeof(stack_buf)) {
c89f86385056 6814659: separable cleanups and subroutines for 6655638
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parents: 605
diff changeset
232 char* chars = stack_buf;
c89f86385056 6814659: separable cleanups and subroutines for 6655638
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parents: 605
diff changeset
233 UNICODE::convert_to_utf8(name, utf16_length, chars);
c89f86385056 6814659: separable cleanups and subroutines for 6655638
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parents: 605
diff changeset
234 return lookup(chars, utf8_length, THREAD);
c89f86385056 6814659: separable cleanups and subroutines for 6655638
jrose
parents: 605
diff changeset
235 } else {
c89f86385056 6814659: separable cleanups and subroutines for 6655638
jrose
parents: 605
diff changeset
236 ResourceMark rm(THREAD);
c89f86385056 6814659: separable cleanups and subroutines for 6655638
jrose
parents: 605
diff changeset
237 char* chars = NEW_RESOURCE_ARRAY(char, utf8_length + 1);;
c89f86385056 6814659: separable cleanups and subroutines for 6655638
jrose
parents: 605
diff changeset
238 UNICODE::convert_to_utf8(name, utf16_length, chars);
c89f86385056 6814659: separable cleanups and subroutines for 6655638
jrose
parents: 605
diff changeset
239 return lookup(chars, utf8_length, THREAD);
c89f86385056 6814659: separable cleanups and subroutines for 6655638
jrose
parents: 605
diff changeset
240 }
c89f86385056 6814659: separable cleanups and subroutines for 6655638
jrose
parents: 605
diff changeset
241 }
c89f86385056 6814659: separable cleanups and subroutines for 6655638
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parents: 605
diff changeset
242
2177
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coleenp
parents: 1972
diff changeset
243 Symbol* SymbolTable::lookup_only_unicode(const jchar* name, int utf16_length,
665
c89f86385056 6814659: separable cleanups and subroutines for 6655638
jrose
parents: 605
diff changeset
244 unsigned int& hash) {
c89f86385056 6814659: separable cleanups and subroutines for 6655638
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parents: 605
diff changeset
245 int utf8_length = UNICODE::utf8_length((jchar*) name, utf16_length);
c89f86385056 6814659: separable cleanups and subroutines for 6655638
jrose
parents: 605
diff changeset
246 char stack_buf[128];
c89f86385056 6814659: separable cleanups and subroutines for 6655638
jrose
parents: 605
diff changeset
247 if (utf8_length < (int) sizeof(stack_buf)) {
c89f86385056 6814659: separable cleanups and subroutines for 6655638
jrose
parents: 605
diff changeset
248 char* chars = stack_buf;
c89f86385056 6814659: separable cleanups and subroutines for 6655638
jrose
parents: 605
diff changeset
249 UNICODE::convert_to_utf8(name, utf16_length, chars);
c89f86385056 6814659: separable cleanups and subroutines for 6655638
jrose
parents: 605
diff changeset
250 return lookup_only(chars, utf8_length, hash);
c89f86385056 6814659: separable cleanups and subroutines for 6655638
jrose
parents: 605
diff changeset
251 } else {
c89f86385056 6814659: separable cleanups and subroutines for 6655638
jrose
parents: 605
diff changeset
252 ResourceMark rm;
c89f86385056 6814659: separable cleanups and subroutines for 6655638
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parents: 605
diff changeset
253 char* chars = NEW_RESOURCE_ARRAY(char, utf8_length + 1);;
c89f86385056 6814659: separable cleanups and subroutines for 6655638
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parents: 605
diff changeset
254 UNICODE::convert_to_utf8(name, utf16_length, chars);
c89f86385056 6814659: separable cleanups and subroutines for 6655638
jrose
parents: 605
diff changeset
255 return lookup_only(chars, utf8_length, hash);
c89f86385056 6814659: separable cleanups and subroutines for 6655638
jrose
parents: 605
diff changeset
256 }
c89f86385056 6814659: separable cleanups and subroutines for 6655638
jrose
parents: 605
diff changeset
257 }
c89f86385056 6814659: separable cleanups and subroutines for 6655638
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parents: 605
diff changeset
258
0
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259 void SymbolTable::add(constantPoolHandle cp, int names_count,
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diff changeset
260 const char** names, int* lengths, int* cp_indices,
a61af66fc99e Initial load
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parents:
diff changeset
261 unsigned int* hashValues, TRAPS) {
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diff changeset
262 SymbolTable* table = the_table();
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diff changeset
263 bool added = table->basic_add(cp, names_count, names, lengths,
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parents:
diff changeset
264 cp_indices, hashValues, CHECK);
a61af66fc99e Initial load
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parents:
diff changeset
265 if (!added) {
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parents:
diff changeset
266 // do it the hard way
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parents:
diff changeset
267 for (int i=0; i<names_count; i++) {
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268 int index = table->hash_to_index(hashValues[i]);
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parents: 1972
diff changeset
269 Symbol* sym = table->basic_add(index, (u1*)names[i], lengths[i],
0
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diff changeset
270 hashValues[i], CHECK);
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diff changeset
271 cp->symbol_at_put(cp_indices[i], sym);
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parents:
diff changeset
272 }
a61af66fc99e Initial load
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parents:
diff changeset
273 }
a61af66fc99e Initial load
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diff changeset
274 }
a61af66fc99e Initial load
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diff changeset
275
2177
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coleenp
parents: 1972
diff changeset
276 Symbol* SymbolTable::basic_add(int index, u1 *name, int len,
0
a61af66fc99e Initial load
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parents:
diff changeset
277 unsigned int hashValue, TRAPS) {
a61af66fc99e Initial load
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parents:
diff changeset
278 assert(!Universe::heap()->is_in_reserved(name) || GC_locker::is_active(),
a61af66fc99e Initial load
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parents:
diff changeset
279 "proposed name of symbol must be stable");
a61af66fc99e Initial load
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280
a61af66fc99e Initial load
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parents:
diff changeset
281 // We assume that lookup() has been called already, that it failed,
a61af66fc99e Initial load
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parents:
diff changeset
282 // and symbol was not found. We create the symbol here.
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
283 Symbol* sym = allocate_symbol(name, len, CHECK_NULL);
0
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parents:
diff changeset
284
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
285 // Allocation must be done before grabbing the SymbolTable_lock lock
0
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diff changeset
286 MutexLocker ml(SymbolTable_lock, THREAD);
a61af66fc99e Initial load
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diff changeset
287
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parents:
diff changeset
288 assert(sym->equals((char*)name, len), "symbol must be properly initialized");
a61af66fc99e Initial load
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diff changeset
289
a61af66fc99e Initial load
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parents:
diff changeset
290 // Since look-up was done lock-free, we need to check if another
a61af66fc99e Initial load
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parents:
diff changeset
291 // thread beat us in the race to insert the symbol.
a61af66fc99e Initial load
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parents:
diff changeset
292
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
293 Symbol* test = lookup(index, (char*)name, len, hashValue);
0
a61af66fc99e Initial load
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parents:
diff changeset
294 if (test != NULL) {
605
98cb887364d3 6810672: Comment typos
twisti
parents: 0
diff changeset
295 // A race occurred and another thread introduced the symbol, this one
0
a61af66fc99e Initial load
duke
parents:
diff changeset
296 // will be dropped and collected.
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
297 delete sym;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
298 assert(test->refcount() != 0, "lookup should have incremented the count");
0
a61af66fc99e Initial load
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parents:
diff changeset
299 return test;
a61af66fc99e Initial load
duke
parents:
diff changeset
300 }
a61af66fc99e Initial load
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parents:
diff changeset
301
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
302 HashtableEntry<Symbol*>* entry = new_entry(hashValue, sym);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
303 sym->increment_refcount();
0
a61af66fc99e Initial load
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parents:
diff changeset
304 add_entry(index, entry);
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
305 return sym;
0
a61af66fc99e Initial load
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parents:
diff changeset
306 }
a61af66fc99e Initial load
duke
parents:
diff changeset
307
a61af66fc99e Initial load
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parents:
diff changeset
308 bool SymbolTable::basic_add(constantPoolHandle cp, int names_count,
a61af66fc99e Initial load
duke
parents:
diff changeset
309 const char** names, int* lengths,
a61af66fc99e Initial load
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parents:
diff changeset
310 int* cp_indices, unsigned int* hashValues,
a61af66fc99e Initial load
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parents:
diff changeset
311 TRAPS) {
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
312 Symbol* syms[symbol_alloc_batch_size];
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
313 bool allocated = allocate_symbols(names_count, (const u1**)names, lengths,
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
314 syms, CHECK_false);
0
a61af66fc99e Initial load
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parents:
diff changeset
315 if (!allocated) {
a61af66fc99e Initial load
duke
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diff changeset
316 return false;
a61af66fc99e Initial load
duke
parents:
diff changeset
317 }
a61af66fc99e Initial load
duke
parents:
diff changeset
318
a61af66fc99e Initial load
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parents:
diff changeset
319 // Allocation must be done before grabbing the SymbolTable_lock lock
a61af66fc99e Initial load
duke
parents:
diff changeset
320 MutexLocker ml(SymbolTable_lock, THREAD);
a61af66fc99e Initial load
duke
parents:
diff changeset
321
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
322 for (int i=0; i<names_count; i++) {
0
a61af66fc99e Initial load
duke
parents:
diff changeset
323 assert(syms[i]->equals(names[i], lengths[i]), "symbol must be properly initialized");
a61af66fc99e Initial load
duke
parents:
diff changeset
324 // Since look-up was done lock-free, we need to check if another
a61af66fc99e Initial load
duke
parents:
diff changeset
325 // thread beat us in the race to insert the symbol.
a61af66fc99e Initial load
duke
parents:
diff changeset
326 int index = hash_to_index(hashValues[i]);
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
327 Symbol* test = lookup(index, names[i], lengths[i], hashValues[i]);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
328 if (test != NULL) {
605
98cb887364d3 6810672: Comment typos
twisti
parents: 0
diff changeset
329 // A race occurred and another thread introduced the symbol, this one
0
a61af66fc99e Initial load
duke
parents:
diff changeset
330 // will be dropped and collected. Use test instead.
a61af66fc99e Initial load
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parents:
diff changeset
331 cp->symbol_at_put(cp_indices[i], test);
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
332 assert(test->refcount() != 0, "lookup should have incremented the count");
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
333 delete syms[i];
0
a61af66fc99e Initial load
duke
parents:
diff changeset
334 } else {
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
335 Symbol* sym = syms[i];
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
336 HashtableEntry<Symbol*>* entry = new_entry(hashValues[i], sym);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
337 sym->increment_refcount(); // increment refcount in external hashtable
0
a61af66fc99e Initial load
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parents:
diff changeset
338 add_entry(index, entry);
a61af66fc99e Initial load
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parents:
diff changeset
339 cp->symbol_at_put(cp_indices[i], sym);
a61af66fc99e Initial load
duke
parents:
diff changeset
340 }
a61af66fc99e Initial load
duke
parents:
diff changeset
341 }
a61af66fc99e Initial load
duke
parents:
diff changeset
342
a61af66fc99e Initial load
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parents:
diff changeset
343 return true;
a61af66fc99e Initial load
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parents:
diff changeset
344 }
a61af66fc99e Initial load
duke
parents:
diff changeset
345
a61af66fc99e Initial load
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parents:
diff changeset
346
a61af66fc99e Initial load
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parents:
diff changeset
347 void SymbolTable::verify() {
a61af66fc99e Initial load
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parents:
diff changeset
348 for (int i = 0; i < the_table()->table_size(); ++i) {
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
349 HashtableEntry<Symbol*>* p = the_table()->bucket(i);
0
a61af66fc99e Initial load
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parents:
diff changeset
350 for ( ; p != NULL; p = p->next()) {
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
351 Symbol* s = (Symbol*)(p->literal());
0
a61af66fc99e Initial load
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parents:
diff changeset
352 guarantee(s != NULL, "symbol is NULL");
a61af66fc99e Initial load
duke
parents:
diff changeset
353 unsigned int h = hash_symbol((char*)s->bytes(), s->utf8_length());
a61af66fc99e Initial load
duke
parents:
diff changeset
354 guarantee(p->hash() == h, "broken hash in symbol table entry");
a61af66fc99e Initial load
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parents:
diff changeset
355 guarantee(the_table()->hash_to_index(h) == i,
a61af66fc99e Initial load
duke
parents:
diff changeset
356 "wrong index in symbol table");
a61af66fc99e Initial load
duke
parents:
diff changeset
357 }
a61af66fc99e Initial load
duke
parents:
diff changeset
358 }
a61af66fc99e Initial load
duke
parents:
diff changeset
359 }
a61af66fc99e Initial load
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parents:
diff changeset
360
a61af66fc99e Initial load
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diff changeset
361
a61af66fc99e Initial load
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parents:
diff changeset
362 //---------------------------------------------------------------------------
a61af66fc99e Initial load
duke
parents:
diff changeset
363 // Non-product code
a61af66fc99e Initial load
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parents:
diff changeset
364
a61af66fc99e Initial load
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parents:
diff changeset
365 #ifndef PRODUCT
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366
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367 void SymbolTable::print_histogram() {
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368 MutexLocker ml(SymbolTable_lock);
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369 const int results_length = 100;
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370 int results[results_length];
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diff changeset
371 int i,j;
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372
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373 // initialize results to zero
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374 for (j = 0; j < results_length; j++) {
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375 results[j] = 0;
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parents:
diff changeset
376 }
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377
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378 int total = 0;
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379 int max_symbols = 0;
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380 int out_of_range = 0;
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coleenp
parents: 1972
diff changeset
381 int memory_total = 0;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
382 int count = 0;
0
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383 for (i = 0; i < the_table()->table_size(); i++) {
2177
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coleenp
parents: 1972
diff changeset
384 HashtableEntry<Symbol*>* p = the_table()->bucket(i);
0
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385 for ( ; p != NULL; p = p->next()) {
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
386 memory_total += p->literal()->object_size();
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
387 count++;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
388 int counter = p->literal()->utf8_length();
0
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389 total += counter;
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390 if (counter < results_length) {
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391 results[counter]++;
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392 } else {
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393 out_of_range++;
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394 }
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395 max_symbols = MAX2(max_symbols, counter);
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396 }
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397 }
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398 tty->print_cr("Symbol Table:");
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
399 tty->print_cr("Total number of symbols %5d", count);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
400 tty->print_cr("Total size in memory %5dK",
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
401 (memory_total*HeapWordSize)/1024);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
402 tty->print_cr("Total counted %5d", symbols_counted);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
403 tty->print_cr("Total removed %5d", symbols_removed);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
404 if (symbols_counted > 0) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
405 tty->print_cr("Percent removed %3.2f",
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
406 ((float)symbols_removed/(float)symbols_counted)* 100);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
407 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
408 tty->print_cr("Reference counts %5d", Symbol::_total_count);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
409 tty->print_cr("Histogram of symbol length:");
0
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410 tty->print_cr("%8s %5d", "Total ", total);
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411 tty->print_cr("%8s %5d", "Maximum", max_symbols);
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412 tty->print_cr("%8s %3.2f", "Average",
a61af66fc99e Initial load
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413 ((float) total / (float) the_table()->table_size()));
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414 tty->print_cr("%s", "Histogram:");
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415 tty->print_cr(" %s %29s", "Length", "Number chains that length");
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416 for (i = 0; i < results_length; i++) {
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parents:
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417 if (results[i] > 0) {
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418 tty->print_cr("%6d %10d", i, results[i]);
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419 }
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parents:
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420 }
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
421 if (Verbose) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
422 int line_length = 70;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
423 tty->print_cr("%s %30s", " Length", "Number chains that length");
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
424 for (i = 0; i < results_length; i++) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
425 if (results[i] > 0) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
426 tty->print("%4d", i);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
427 for (j = 0; (j < results[i]) && (j < line_length); j++) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
428 tty->print("%1s", "*");
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
429 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
430 if (j == line_length) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
431 tty->print("%1s", "+");
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
432 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
433 tty->cr();
0
a61af66fc99e Initial load
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parents:
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434 }
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
435 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
436 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
437 tty->print_cr(" %s %d: %d\n", "Number chains longer than",
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
438 results_length, out_of_range);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
439 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
440
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
441 void SymbolTable::print() {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
442 for (int i = 0; i < the_table()->table_size(); ++i) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
443 HashtableEntry<Symbol*>** p = the_table()->bucket_addr(i);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
444 HashtableEntry<Symbol*>* entry = the_table()->bucket(i);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
445 if (entry != NULL) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
446 while (entry != NULL) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
447 tty->print(PTR_FORMAT " ", entry->literal());
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
448 entry->literal()->print();
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
449 tty->print(" %d", entry->literal()->refcount());
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
450 p = entry->next_addr();
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
451 entry = (HashtableEntry<Symbol*>*)HashtableEntry<Symbol*>::make_ptr(*p);
0
a61af66fc99e Initial load
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452 }
a61af66fc99e Initial load
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diff changeset
453 tty->cr();
a61af66fc99e Initial load
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diff changeset
454 }
a61af66fc99e Initial load
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parents:
diff changeset
455 }
a61af66fc99e Initial load
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parents:
diff changeset
456 }
a61af66fc99e Initial load
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457
a61af66fc99e Initial load
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diff changeset
458 #endif // PRODUCT
a61af66fc99e Initial load
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459
a61af66fc99e Initial load
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parents:
diff changeset
460 // --------------------------------------------------------------------------
a61af66fc99e Initial load
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461
a61af66fc99e Initial load
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diff changeset
462 #ifdef ASSERT
a61af66fc99e Initial load
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diff changeset
463 class StableMemoryChecker : public StackObj {
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diff changeset
464 enum { _bufsize = wordSize*4 };
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465
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diff changeset
466 address _region;
a61af66fc99e Initial load
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467 jint _size;
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diff changeset
468 u1 _save_buf[_bufsize];
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diff changeset
469
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diff changeset
470 int sample(u1* save_buf) {
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parents:
diff changeset
471 if (_size <= _bufsize) {
a61af66fc99e Initial load
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diff changeset
472 memcpy(save_buf, _region, _size);
a61af66fc99e Initial load
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diff changeset
473 return _size;
a61af66fc99e Initial load
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diff changeset
474 } else {
a61af66fc99e Initial load
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parents:
diff changeset
475 // copy head and tail
a61af66fc99e Initial load
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diff changeset
476 memcpy(&save_buf[0], _region, _bufsize/2);
a61af66fc99e Initial load
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parents:
diff changeset
477 memcpy(&save_buf[_bufsize/2], _region + _size - _bufsize/2, _bufsize/2);
a61af66fc99e Initial load
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parents:
diff changeset
478 return (_bufsize/2)*2;
a61af66fc99e Initial load
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diff changeset
479 }
a61af66fc99e Initial load
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diff changeset
480 }
a61af66fc99e Initial load
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diff changeset
481
a61af66fc99e Initial load
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parents:
diff changeset
482 public:
a61af66fc99e Initial load
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diff changeset
483 StableMemoryChecker(const void* region, jint size) {
a61af66fc99e Initial load
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diff changeset
484 _region = (address) region;
a61af66fc99e Initial load
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parents:
diff changeset
485 _size = size;
a61af66fc99e Initial load
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parents:
diff changeset
486 sample(_save_buf);
a61af66fc99e Initial load
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parents:
diff changeset
487 }
a61af66fc99e Initial load
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diff changeset
488
a61af66fc99e Initial load
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parents:
diff changeset
489 bool verify() {
a61af66fc99e Initial load
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parents:
diff changeset
490 u1 check_buf[sizeof(_save_buf)];
a61af66fc99e Initial load
duke
parents:
diff changeset
491 int check_size = sample(check_buf);
a61af66fc99e Initial load
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parents:
diff changeset
492 return (0 == memcmp(_save_buf, check_buf, check_size));
a61af66fc99e Initial load
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diff changeset
493 }
a61af66fc99e Initial load
duke
parents:
diff changeset
494
a61af66fc99e Initial load
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parents:
diff changeset
495 void set_region(const void* region) { _region = (address) region; }
a61af66fc99e Initial load
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parents:
diff changeset
496 };
a61af66fc99e Initial load
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parents:
diff changeset
497 #endif
a61af66fc99e Initial load
duke
parents:
diff changeset
498
a61af66fc99e Initial load
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parents:
diff changeset
499
a61af66fc99e Initial load
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parents:
diff changeset
500 // --------------------------------------------------------------------------
a61af66fc99e Initial load
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parents:
diff changeset
501 StringTable* StringTable::_the_table = NULL;
a61af66fc99e Initial load
duke
parents:
diff changeset
502
a61af66fc99e Initial load
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parents:
diff changeset
503 oop StringTable::lookup(int index, jchar* name,
a61af66fc99e Initial load
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parents:
diff changeset
504 int len, unsigned int hash) {
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
505 for (HashtableEntry<oop>* l = bucket(index); l != NULL; l = l->next()) {
0
a61af66fc99e Initial load
duke
parents:
diff changeset
506 if (l->hash() == hash) {
a61af66fc99e Initial load
duke
parents:
diff changeset
507 if (java_lang_String::equals(l->literal(), name, len)) {
a61af66fc99e Initial load
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parents:
diff changeset
508 return l->literal();
a61af66fc99e Initial load
duke
parents:
diff changeset
509 }
a61af66fc99e Initial load
duke
parents:
diff changeset
510 }
a61af66fc99e Initial load
duke
parents:
diff changeset
511 }
a61af66fc99e Initial load
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parents:
diff changeset
512 return NULL;
a61af66fc99e Initial load
duke
parents:
diff changeset
513 }
a61af66fc99e Initial load
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parents:
diff changeset
514
a61af66fc99e Initial load
duke
parents:
diff changeset
515
a61af66fc99e Initial load
duke
parents:
diff changeset
516 oop StringTable::basic_add(int index, Handle string_or_null, jchar* name,
a61af66fc99e Initial load
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parents:
diff changeset
517 int len, unsigned int hashValue, TRAPS) {
a61af66fc99e Initial load
duke
parents:
diff changeset
518 debug_only(StableMemoryChecker smc(name, len * sizeof(name[0])));
a61af66fc99e Initial load
duke
parents:
diff changeset
519 assert(!Universe::heap()->is_in_reserved(name) || GC_locker::is_active(),
a61af66fc99e Initial load
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parents:
diff changeset
520 "proposed name of symbol must be stable");
a61af66fc99e Initial load
duke
parents:
diff changeset
521
a61af66fc99e Initial load
duke
parents:
diff changeset
522 Handle string;
a61af66fc99e Initial load
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parents:
diff changeset
523 // try to reuse the string if possible
2379
b099aaf51bf8 6962931: move interned strings out of the perm gen
jcoomes
parents: 2336
diff changeset
524 if (!string_or_null.is_null() && (!JavaObjectsInPerm || string_or_null()->is_perm())) {
0
a61af66fc99e Initial load
duke
parents:
diff changeset
525 string = string_or_null;
a61af66fc99e Initial load
duke
parents:
diff changeset
526 } else {
a61af66fc99e Initial load
duke
parents:
diff changeset
527 string = java_lang_String::create_tenured_from_unicode(name, len, CHECK_NULL);
a61af66fc99e Initial load
duke
parents:
diff changeset
528 }
a61af66fc99e Initial load
duke
parents:
diff changeset
529
a61af66fc99e Initial load
duke
parents:
diff changeset
530 // Allocation must be done before grapping the SymbolTable_lock lock
a61af66fc99e Initial load
duke
parents:
diff changeset
531 MutexLocker ml(StringTable_lock, THREAD);
a61af66fc99e Initial load
duke
parents:
diff changeset
532
a61af66fc99e Initial load
duke
parents:
diff changeset
533 assert(java_lang_String::equals(string(), name, len),
a61af66fc99e Initial load
duke
parents:
diff changeset
534 "string must be properly initialized");
a61af66fc99e Initial load
duke
parents:
diff changeset
535
a61af66fc99e Initial load
duke
parents:
diff changeset
536 // Since look-up was done lock-free, we need to check if another
a61af66fc99e Initial load
duke
parents:
diff changeset
537 // thread beat us in the race to insert the symbol.
a61af66fc99e Initial load
duke
parents:
diff changeset
538
a61af66fc99e Initial load
duke
parents:
diff changeset
539 oop test = lookup(index, name, len, hashValue); // calls lookup(u1*, int)
a61af66fc99e Initial load
duke
parents:
diff changeset
540 if (test != NULL) {
a61af66fc99e Initial load
duke
parents:
diff changeset
541 // Entry already added
a61af66fc99e Initial load
duke
parents:
diff changeset
542 return test;
a61af66fc99e Initial load
duke
parents:
diff changeset
543 }
a61af66fc99e Initial load
duke
parents:
diff changeset
544
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
545 HashtableEntry<oop>* entry = new_entry(hashValue, string());
0
a61af66fc99e Initial load
duke
parents:
diff changeset
546 add_entry(index, entry);
a61af66fc99e Initial load
duke
parents:
diff changeset
547 return string();
a61af66fc99e Initial load
duke
parents:
diff changeset
548 }
a61af66fc99e Initial load
duke
parents:
diff changeset
549
a61af66fc99e Initial load
duke
parents:
diff changeset
550
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
551 oop StringTable::lookup(Symbol* symbol) {
0
a61af66fc99e Initial load
duke
parents:
diff changeset
552 ResourceMark rm;
a61af66fc99e Initial load
duke
parents:
diff changeset
553 int length;
a61af66fc99e Initial load
duke
parents:
diff changeset
554 jchar* chars = symbol->as_unicode(length);
2418
352622fd140a 7032129: Native memory usage grow unexpectedly for vm/oom/*InternedString tests
never
parents: 2379
diff changeset
555 unsigned int hashValue = java_lang_String::hash_string(chars, length);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
556 int index = the_table()->hash_to_index(hashValue);
a61af66fc99e Initial load
duke
parents:
diff changeset
557 return the_table()->lookup(index, chars, length, hashValue);
a61af66fc99e Initial load
duke
parents:
diff changeset
558 }
a61af66fc99e Initial load
duke
parents:
diff changeset
559
a61af66fc99e Initial load
duke
parents:
diff changeset
560
a61af66fc99e Initial load
duke
parents:
diff changeset
561 oop StringTable::intern(Handle string_or_null, jchar* name,
a61af66fc99e Initial load
duke
parents:
diff changeset
562 int len, TRAPS) {
2418
352622fd140a 7032129: Native memory usage grow unexpectedly for vm/oom/*InternedString tests
never
parents: 2379
diff changeset
563 unsigned int hashValue = java_lang_String::hash_string(name, len);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
564 int index = the_table()->hash_to_index(hashValue);
a61af66fc99e Initial load
duke
parents:
diff changeset
565 oop string = the_table()->lookup(index, name, len, hashValue);
a61af66fc99e Initial load
duke
parents:
diff changeset
566
a61af66fc99e Initial load
duke
parents:
diff changeset
567 // Found
a61af66fc99e Initial load
duke
parents:
diff changeset
568 if (string != NULL) return string;
a61af66fc99e Initial load
duke
parents:
diff changeset
569
a61af66fc99e Initial load
duke
parents:
diff changeset
570 // Otherwise, add to symbol to table
a61af66fc99e Initial load
duke
parents:
diff changeset
571 return the_table()->basic_add(index, string_or_null, name, len,
a61af66fc99e Initial load
duke
parents:
diff changeset
572 hashValue, CHECK_NULL);
a61af66fc99e Initial load
duke
parents:
diff changeset
573 }
a61af66fc99e Initial load
duke
parents:
diff changeset
574
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
575 oop StringTable::intern(Symbol* symbol, TRAPS) {
0
a61af66fc99e Initial load
duke
parents:
diff changeset
576 if (symbol == NULL) return NULL;
a61af66fc99e Initial load
duke
parents:
diff changeset
577 ResourceMark rm(THREAD);
a61af66fc99e Initial load
duke
parents:
diff changeset
578 int length;
a61af66fc99e Initial load
duke
parents:
diff changeset
579 jchar* chars = symbol->as_unicode(length);
a61af66fc99e Initial load
duke
parents:
diff changeset
580 Handle string;
a61af66fc99e Initial load
duke
parents:
diff changeset
581 oop result = intern(string, chars, length, CHECK_NULL);
a61af66fc99e Initial load
duke
parents:
diff changeset
582 return result;
a61af66fc99e Initial load
duke
parents:
diff changeset
583 }
a61af66fc99e Initial load
duke
parents:
diff changeset
584
a61af66fc99e Initial load
duke
parents:
diff changeset
585
a61af66fc99e Initial load
duke
parents:
diff changeset
586 oop StringTable::intern(oop string, TRAPS)
a61af66fc99e Initial load
duke
parents:
diff changeset
587 {
a61af66fc99e Initial load
duke
parents:
diff changeset
588 if (string == NULL) return NULL;
a61af66fc99e Initial load
duke
parents:
diff changeset
589 ResourceMark rm(THREAD);
a61af66fc99e Initial load
duke
parents:
diff changeset
590 int length;
a61af66fc99e Initial load
duke
parents:
diff changeset
591 Handle h_string (THREAD, string);
a61af66fc99e Initial load
duke
parents:
diff changeset
592 jchar* chars = java_lang_String::as_unicode_string(string, length);
a61af66fc99e Initial load
duke
parents:
diff changeset
593 oop result = intern(h_string, chars, length, CHECK_NULL);
a61af66fc99e Initial load
duke
parents:
diff changeset
594 return result;
a61af66fc99e Initial load
duke
parents:
diff changeset
595 }
a61af66fc99e Initial load
duke
parents:
diff changeset
596
a61af66fc99e Initial load
duke
parents:
diff changeset
597
a61af66fc99e Initial load
duke
parents:
diff changeset
598 oop StringTable::intern(const char* utf8_string, TRAPS) {
a61af66fc99e Initial load
duke
parents:
diff changeset
599 if (utf8_string == NULL) return NULL;
a61af66fc99e Initial load
duke
parents:
diff changeset
600 ResourceMark rm(THREAD);
a61af66fc99e Initial load
duke
parents:
diff changeset
601 int length = UTF8::unicode_length(utf8_string);
a61af66fc99e Initial load
duke
parents:
diff changeset
602 jchar* chars = NEW_RESOURCE_ARRAY(jchar, length);
a61af66fc99e Initial load
duke
parents:
diff changeset
603 UTF8::convert_to_unicode(utf8_string, chars, length);
a61af66fc99e Initial load
duke
parents:
diff changeset
604 Handle string;
a61af66fc99e Initial load
duke
parents:
diff changeset
605 oop result = intern(string, chars, length, CHECK_NULL);
a61af66fc99e Initial load
duke
parents:
diff changeset
606 return result;
a61af66fc99e Initial load
duke
parents:
diff changeset
607 }
a61af66fc99e Initial load
duke
parents:
diff changeset
608
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
609 void StringTable::unlink(BoolObjectClosure* is_alive) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
610 // Readers of the table are unlocked, so we should only be removing
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
611 // entries at a safepoint.
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
612 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
613 for (int i = 0; i < the_table()->table_size(); ++i) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
614 for (HashtableEntry<oop>** p = the_table()->bucket_addr(i); *p != NULL; ) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
615 HashtableEntry<oop>* entry = *p;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
616 if (entry->is_shared()) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
617 break;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
618 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
619 assert(entry->literal() != NULL, "just checking");
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
620 if (is_alive->do_object_b(entry->literal())) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
621 p = entry->next_addr();
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
622 } else {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
623 *p = entry->next();
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
624 the_table()->free_entry(entry);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
625 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
626 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
627 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
628 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
629
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
630 void StringTable::oops_do(OopClosure* f) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
631 for (int i = 0; i < the_table()->table_size(); ++i) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
632 HashtableEntry<oop>** p = the_table()->bucket_addr(i);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
633 HashtableEntry<oop>* entry = the_table()->bucket(i);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
634 while (entry != NULL) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
635 f->do_oop((oop*)entry->literal_addr());
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
636
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
637 // Did the closure remove the literal from the table?
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
638 if (entry->literal() == NULL) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
639 assert(!entry->is_shared(), "immutable hashtable entry?");
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
640 *p = entry->next();
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
641 the_table()->free_entry(entry);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
642 } else {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
643 p = entry->next_addr();
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
644 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
645 entry = (HashtableEntry<oop>*)HashtableEntry<oop>::make_ptr(*p);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
646 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
647 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
648 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
649
0
a61af66fc99e Initial load
duke
parents:
diff changeset
650 void StringTable::verify() {
a61af66fc99e Initial load
duke
parents:
diff changeset
651 for (int i = 0; i < the_table()->table_size(); ++i) {
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 1972
diff changeset
652 HashtableEntry<oop>* p = the_table()->bucket(i);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
653 for ( ; p != NULL; p = p->next()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
654 oop s = p->literal();
a61af66fc99e Initial load
duke
parents:
diff changeset
655 guarantee(s != NULL, "interned string is NULL");
2379
b099aaf51bf8 6962931: move interned strings out of the perm gen
jcoomes
parents: 2336
diff changeset
656 guarantee(s->is_perm() || !JavaObjectsInPerm, "interned string not in permspace");
2418
352622fd140a 7032129: Native memory usage grow unexpectedly for vm/oom/*InternedString tests
never
parents: 2379
diff changeset
657 unsigned int h = java_lang_String::hash_string(s);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
658 guarantee(p->hash() == h, "broken hash in string table entry");
a61af66fc99e Initial load
duke
parents:
diff changeset
659 guarantee(the_table()->hash_to_index(h) == i,
a61af66fc99e Initial load
duke
parents:
diff changeset
660 "wrong index in string table");
a61af66fc99e Initial load
duke
parents:
diff changeset
661 }
a61af66fc99e Initial load
duke
parents:
diff changeset
662 }
a61af66fc99e Initial load
duke
parents:
diff changeset
663 }