Mercurial > hg > truffle
annotate src/share/vm/classfile/placeholders.cpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | d2a62e0f25eb |
| children | 070d523b96a7 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2003, 2012, 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" |
| 26 #include "classfile/placeholders.hpp" | |
| 27 #include "classfile/systemDictionary.hpp" | |
| 28 #include "oops/oop.inline.hpp" | |
| 29 #include "runtime/fieldType.hpp" | |
| 30 #include "utilities/hashtable.inline.hpp" | |
| 0 | 31 |
| 32 // Placeholder methods | |
| 33 | |
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34 PlaceholderEntry* PlaceholderTable::new_entry(int hash, Symbol* name, |
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35 ClassLoaderData* loader_data, |
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36 bool havesupername, |
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37 Symbol* supername) { |
| 6197 | 38 PlaceholderEntry* entry = (PlaceholderEntry*)Hashtable<Symbol*, mtClass>::new_entry(hash, name); |
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39 // Hashtable with Symbol* literal must increment and decrement refcount. |
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40 name->increment_refcount(); |
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41 entry->set_loader_data(loader_data); |
| 0 | 42 entry->set_havesupername(havesupername); |
| 43 entry->set_supername(supername); | |
| 44 entry->set_superThreadQ(NULL); | |
| 45 entry->set_loadInstanceThreadQ(NULL); | |
| 46 entry->set_defineThreadQ(NULL); | |
| 47 entry->set_definer(NULL); | |
| 48 entry->set_instanceKlass(NULL); | |
| 49 return entry; | |
| 50 } | |
| 51 | |
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52 void PlaceholderTable::free_entry(PlaceholderEntry* entry) { |
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53 // decrement Symbol refcount here because Hashtable doesn't. |
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54 entry->literal()->decrement_refcount(); |
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55 if (entry->supername() != NULL) entry->supername()->decrement_refcount(); |
| 6197 | 56 Hashtable<Symbol*, mtClass>::free_entry(entry); |
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57 } |
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58 |
| 0 | 59 |
| 60 // Placeholder objects represent classes currently being loaded. | |
| 61 // All threads examining the placeholder table must hold the | |
| 62 // SystemDictionary_lock, so we don't need special precautions | |
| 63 // on store ordering here. | |
| 64 void PlaceholderTable::add_entry(int index, unsigned int hash, | |
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65 Symbol* class_name, ClassLoaderData* loader_data, |
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66 bool havesupername, Symbol* supername){ |
| 0 | 67 assert_locked_or_safepoint(SystemDictionary_lock); |
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68 assert(class_name != NULL, "adding NULL obj"); |
| 0 | 69 |
| 70 // Both readers and writers are locked so it's safe to just | |
| 71 // create the placeholder and insert it in the list without a membar. | |
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72 PlaceholderEntry* entry = new_entry(hash, class_name, loader_data, havesupername, supername); |
| 0 | 73 add_entry(index, entry); |
| 74 } | |
| 75 | |
| 76 | |
| 77 // Remove a placeholder object. | |
| 78 void PlaceholderTable::remove_entry(int index, unsigned int hash, | |
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79 Symbol* class_name, |
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80 ClassLoaderData* loader_data) { |
| 0 | 81 assert_locked_or_safepoint(SystemDictionary_lock); |
| 82 PlaceholderEntry** p = bucket_addr(index); | |
| 83 while (*p) { | |
| 84 PlaceholderEntry *probe = *p; | |
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85 if (probe->hash() == hash && probe->equals(class_name, loader_data)) { |
| 0 | 86 // Delete entry |
| 87 *p = probe->next(); | |
| 88 free_entry(probe); | |
| 89 return; | |
| 90 } | |
| 91 p = probe->next_addr(); | |
| 92 } | |
| 93 } | |
| 94 | |
| 95 PlaceholderEntry* PlaceholderTable::get_entry(int index, unsigned int hash, | |
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96 Symbol* class_name, |
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97 ClassLoaderData* loader_data) { |
| 0 | 98 assert_locked_or_safepoint(SystemDictionary_lock); |
| 99 | |
| 100 for (PlaceholderEntry *place_probe = bucket(index); | |
| 101 place_probe != NULL; | |
| 102 place_probe = place_probe->next()) { | |
| 103 if (place_probe->hash() == hash && | |
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104 place_probe->equals(class_name, loader_data)) { |
| 0 | 105 return place_probe; |
| 106 } | |
| 107 } | |
| 108 return NULL; | |
| 109 } | |
| 110 | |
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111 Symbol* PlaceholderTable::find_entry(int index, unsigned int hash, |
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112 Symbol* class_name, |
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113 ClassLoaderData* loader_data) { |
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114 PlaceholderEntry* probe = get_entry(index, hash, class_name, loader_data); |
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115 return (probe? probe->klassname(): (Symbol*)NULL); |
| 0 | 116 } |
| 117 | |
| 118 // find_and_add returns probe pointer - old or new | |
| 119 // If no entry exists, add a placeholder entry | |
| 120 // If entry exists, reuse entry | |
| 121 // For both, push SeenThread for classloadAction | |
| 122 // if havesupername: this is used for circularity for instanceklass loading | |
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123 PlaceholderEntry* PlaceholderTable::find_and_add(int index, unsigned int hash, |
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124 Symbol* name, |
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125 ClassLoaderData* loader_data, |
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126 classloadAction action, |
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127 Symbol* supername, |
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128 Thread* thread) { |
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129 PlaceholderEntry* probe = get_entry(index, hash, name, loader_data); |
| 0 | 130 if (probe == NULL) { |
| 131 // Nothing found, add place holder | |
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132 add_entry(index, hash, name, loader_data, (action == LOAD_SUPER), supername); |
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133 probe = get_entry(index, hash, name, loader_data); |
| 0 | 134 } else { |
| 135 if (action == LOAD_SUPER) { | |
| 136 probe->set_havesupername(true); | |
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137 probe->set_supername(supername); |
| 0 | 138 } |
| 139 } | |
| 140 if (probe) probe->add_seen_thread(thread, action); | |
| 141 return probe; | |
| 142 } | |
| 143 | |
| 144 | |
| 145 // placeholder used to track class loading internal states | |
| 146 // placeholder existence now for loading superclass/superinterface | |
| 147 // superthreadQ tracks class circularity, while loading superclass/superinterface | |
| 148 // loadInstanceThreadQ tracks load_instance_class calls | |
| 149 // definer() tracks the single thread that owns define token | |
| 150 // defineThreadQ tracks waiters on defining thread's results | |
| 151 // 1st claimant creates placeholder | |
| 152 // find_and_add adds SeenThread entry for appropriate queue | |
| 153 // All claimants remove SeenThread after completing action | |
| 154 // On removal: if definer and all queues empty, remove entry | |
| 155 // Note: you can be in both placeholders and systemDictionary | |
| 156 // see parse_stream for redefine classes | |
| 157 // Therefore - must always check SD first | |
| 158 // Ignores the case where entry is not found | |
| 159 void PlaceholderTable::find_and_remove(int index, unsigned int hash, | |
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160 Symbol* name, ClassLoaderData* loader_data, Thread* thread) { |
| 0 | 161 assert_locked_or_safepoint(SystemDictionary_lock); |
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162 PlaceholderEntry *probe = get_entry(index, hash, name, loader_data); |
| 0 | 163 if (probe != NULL) { |
| 164 // No other threads using this entry | |
| 165 if ((probe->superThreadQ() == NULL) && (probe->loadInstanceThreadQ() == NULL) | |
| 166 && (probe->defineThreadQ() == NULL) && (probe->definer() == NULL)) { | |
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167 remove_entry(index, hash, name, loader_data); |
| 0 | 168 } |
| 169 } | |
| 170 } | |
| 171 | |
| 172 PlaceholderTable::PlaceholderTable(int table_size) | |
| 6197 | 173 : TwoOopHashtable<Symbol*, mtClass>(table_size, sizeof(PlaceholderEntry)) { |
| 0 | 174 } |
| 175 | |
| 176 | |
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177 void PlaceholderTable::classes_do(KlassClosure* f) { |
| 0 | 178 for (int index = 0; index < table_size(); index++) { |
| 179 for (PlaceholderEntry* probe = bucket(index); | |
| 180 probe != NULL; | |
| 181 probe = probe->next()) { | |
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182 probe->classes_do(f); |
| 0 | 183 } |
| 184 } | |
| 185 } | |
| 186 | |
| 187 | |
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188 void PlaceholderEntry::classes_do(KlassClosure* closure) { |
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189 assert(klassname() != NULL, "should have a non-null klass"); |
| 0 | 190 if (_instanceKlass != NULL) { |
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191 closure->do_klass(InstanceKlass()); |
| 0 | 192 } |
| 193 } | |
| 194 | |
| 195 // do all entries in the placeholder table | |
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196 void PlaceholderTable::entries_do(void f(Symbol*)) { |
| 0 | 197 for (int index = 0; index < table_size(); index++) { |
| 198 for (PlaceholderEntry* probe = bucket(index); | |
| 199 probe != NULL; | |
| 200 probe = probe->next()) { | |
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201 f(probe->klassname()); |
| 0 | 202 } |
| 203 } | |
| 204 } | |
| 205 | |
| 206 | |
| 207 #ifndef PRODUCT | |
| 208 // Note, doesn't append a cr | |
| 209 void PlaceholderEntry::print() const { | |
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210 klassname()->print_value(); |
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211 if (loader_data() != NULL) { |
| 0 | 212 tty->print(", loader "); |
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213 loader_data()->print_value(); |
| 0 | 214 } |
| 215 if (supername() != NULL) { | |
| 216 tty->print(", supername "); | |
| 217 supername()->print_value(); | |
| 218 } | |
| 219 if (definer() != NULL) { | |
| 220 tty->print(", definer "); | |
| 221 definer()->print_value(); | |
| 222 } | |
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223 if (InstanceKlass() != NULL) { |
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224 tty->print(", InstanceKlass "); |
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225 InstanceKlass()->print_value(); |
| 0 | 226 } |
| 227 tty->print("\n"); | |
| 228 tty->print("loadInstanceThreadQ threads:"); | |
| 229 loadInstanceThreadQ()->printActionQ(); | |
| 230 tty->print("\n"); | |
| 231 tty->print("superThreadQ threads:"); | |
| 232 superThreadQ()->printActionQ(); | |
| 233 tty->print("\n"); | |
| 234 tty->print("defineThreadQ threads:"); | |
| 235 defineThreadQ()->printActionQ(); | |
| 236 tty->print("\n"); | |
| 237 } | |
| 238 #endif | |
| 239 | |
| 240 void PlaceholderEntry::verify() const { | |
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241 guarantee(loader_data() != NULL, "Must have been setup."); |
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242 guarantee(loader_data()->class_loader() == NULL || loader_data()->class_loader()->is_instance(), |
| 0 | 243 "checking type of _loader"); |
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244 guarantee(InstanceKlass() == NULL |
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245 || Klass::cast(InstanceKlass())->oop_is_instance(), |
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246 "checking type of InstanceKlass result"); |
| 0 | 247 } |
| 248 | |
| 249 void PlaceholderTable::verify() { | |
| 250 int element_count = 0; | |
| 251 for (int pindex = 0; pindex < table_size(); pindex++) { | |
| 252 for (PlaceholderEntry* probe = bucket(pindex); | |
| 253 probe != NULL; | |
| 254 probe = probe->next()) { | |
| 255 probe->verify(); | |
| 256 element_count++; // both klasses and place holders count | |
| 257 } | |
| 258 } | |
| 259 guarantee(number_of_entries() == element_count, | |
| 260 "Verify of system dictionary failed"); | |
| 261 } | |
| 262 | |
| 263 | |
| 264 #ifndef PRODUCT | |
| 265 void PlaceholderTable::print() { | |
| 266 for (int pindex = 0; pindex < table_size(); pindex++) { | |
| 267 for (PlaceholderEntry* probe = bucket(pindex); | |
| 268 probe != NULL; | |
| 269 probe = probe->next()) { | |
| 270 if (Verbose) tty->print("%4d: ", pindex); | |
| 271 tty->print(" place holder "); | |
| 272 | |
| 273 probe->print(); | |
| 274 tty->cr(); | |
| 275 } | |
| 276 } | |
| 277 } | |
| 278 #endif |