Mercurial > hg > graal-compiler
annotate src/share/vm/classfile/placeholders.cpp @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
|---|---|
| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | a61af66fc99e |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 0 | 1 /* |
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6941466: Oracle rebranding changes for Hotspot repositories
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2 * Copyright (c) 2003, 2007, 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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6941466: Oracle rebranding changes for Hotspot repositories
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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6941466: Oracle rebranding changes for Hotspot repositories
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20 * or visit www.oracle.com if you need additional information or have any |
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6941466: Oracle rebranding changes for Hotspot repositories
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 # include "incls/_precompiled.incl" | |
| 26 # include "incls/_placeholders.cpp.incl" | |
| 27 | |
| 28 // Placeholder methods | |
| 29 | |
| 30 PlaceholderEntry* PlaceholderTable::new_entry(int hash, symbolOop name, | |
| 31 oop loader, bool havesupername, | |
| 32 symbolOop supername) { | |
| 33 PlaceholderEntry* entry = (PlaceholderEntry*)Hashtable::new_entry(hash, name); | |
| 34 entry->set_loader(loader); | |
| 35 entry->set_havesupername(havesupername); | |
| 36 entry->set_supername(supername); | |
| 37 entry->set_superThreadQ(NULL); | |
| 38 entry->set_loadInstanceThreadQ(NULL); | |
| 39 entry->set_defineThreadQ(NULL); | |
| 40 entry->set_definer(NULL); | |
| 41 entry->set_instanceKlass(NULL); | |
| 42 return entry; | |
| 43 } | |
| 44 | |
| 45 | |
| 46 // Placeholder objects represent classes currently being loaded. | |
| 47 // All threads examining the placeholder table must hold the | |
| 48 // SystemDictionary_lock, so we don't need special precautions | |
| 49 // on store ordering here. | |
| 50 void PlaceholderTable::add_entry(int index, unsigned int hash, | |
| 51 symbolHandle class_name, Handle class_loader, | |
| 52 bool havesupername, symbolHandle supername){ | |
| 53 assert_locked_or_safepoint(SystemDictionary_lock); | |
| 54 assert(!class_name.is_null(), "adding NULL obj"); | |
| 55 | |
| 56 // Both readers and writers are locked so it's safe to just | |
| 57 // create the placeholder and insert it in the list without a membar. | |
| 58 PlaceholderEntry* entry = new_entry(hash, class_name(), class_loader(), havesupername, supername()); | |
| 59 add_entry(index, entry); | |
| 60 } | |
| 61 | |
| 62 | |
| 63 // Remove a placeholder object. | |
| 64 void PlaceholderTable::remove_entry(int index, unsigned int hash, | |
| 65 symbolHandle class_name, | |
| 66 Handle class_loader) { | |
| 67 assert_locked_or_safepoint(SystemDictionary_lock); | |
| 68 PlaceholderEntry** p = bucket_addr(index); | |
| 69 while (*p) { | |
| 70 PlaceholderEntry *probe = *p; | |
| 71 if (probe->hash() == hash && probe->equals(class_name(), class_loader())) { | |
| 72 // Delete entry | |
| 73 *p = probe->next(); | |
| 74 free_entry(probe); | |
| 75 return; | |
| 76 } | |
| 77 p = probe->next_addr(); | |
| 78 } | |
| 79 } | |
| 80 | |
| 81 PlaceholderEntry* PlaceholderTable::get_entry(int index, unsigned int hash, | |
| 82 symbolHandle class_name, | |
| 83 Handle class_loader) { | |
| 84 assert_locked_or_safepoint(SystemDictionary_lock); | |
| 85 | |
| 86 symbolOop class_name_ = class_name(); | |
| 87 oop class_loader_ = class_loader(); | |
| 88 | |
| 89 for (PlaceholderEntry *place_probe = bucket(index); | |
| 90 place_probe != NULL; | |
| 91 place_probe = place_probe->next()) { | |
| 92 if (place_probe->hash() == hash && | |
| 93 place_probe->equals(class_name_, class_loader_)) { | |
| 94 return place_probe; | |
| 95 } | |
| 96 } | |
| 97 return NULL; | |
| 98 } | |
| 99 | |
| 100 symbolOop PlaceholderTable::find_entry(int index, unsigned int hash, | |
| 101 symbolHandle class_name, | |
| 102 Handle class_loader) { | |
| 103 PlaceholderEntry* probe = get_entry(index, hash, class_name, class_loader); | |
| 104 return (probe? probe->klass(): symbolOop(NULL)); | |
| 105 } | |
| 106 | |
| 107 // find_and_add returns probe pointer - old or new | |
| 108 // If no entry exists, add a placeholder entry | |
| 109 // If entry exists, reuse entry | |
| 110 // For both, push SeenThread for classloadAction | |
| 111 // if havesupername: this is used for circularity for instanceklass loading | |
| 112 PlaceholderEntry* PlaceholderTable::find_and_add(int index, unsigned int hash, symbolHandle name, Handle loader, classloadAction action, symbolHandle supername, Thread* thread) { | |
| 113 PlaceholderEntry* probe = get_entry(index, hash, name, loader); | |
| 114 if (probe == NULL) { | |
| 115 // Nothing found, add place holder | |
| 116 add_entry(index, hash, name, loader, (action == LOAD_SUPER), supername); | |
| 117 probe = get_entry(index, hash, name, loader); | |
| 118 } else { | |
| 119 if (action == LOAD_SUPER) { | |
| 120 probe->set_havesupername(true); | |
| 121 probe->set_supername(supername()); | |
| 122 } | |
| 123 } | |
| 124 if (probe) probe->add_seen_thread(thread, action); | |
| 125 return probe; | |
| 126 } | |
| 127 | |
| 128 | |
| 129 // placeholder used to track class loading internal states | |
| 130 // placeholder existence now for loading superclass/superinterface | |
| 131 // superthreadQ tracks class circularity, while loading superclass/superinterface | |
| 132 // loadInstanceThreadQ tracks load_instance_class calls | |
| 133 // definer() tracks the single thread that owns define token | |
| 134 // defineThreadQ tracks waiters on defining thread's results | |
| 135 // 1st claimant creates placeholder | |
| 136 // find_and_add adds SeenThread entry for appropriate queue | |
| 137 // All claimants remove SeenThread after completing action | |
| 138 // On removal: if definer and all queues empty, remove entry | |
| 139 // Note: you can be in both placeholders and systemDictionary | |
| 140 // see parse_stream for redefine classes | |
| 141 // Therefore - must always check SD first | |
| 142 // Ignores the case where entry is not found | |
| 143 void PlaceholderTable::find_and_remove(int index, unsigned int hash, | |
| 144 symbolHandle name, Handle loader, Thread* thread) { | |
| 145 assert_locked_or_safepoint(SystemDictionary_lock); | |
| 146 PlaceholderEntry *probe = get_entry(index, hash, name, loader); | |
| 147 if (probe != NULL) { | |
| 148 // No other threads using this entry | |
| 149 if ((probe->superThreadQ() == NULL) && (probe->loadInstanceThreadQ() == NULL) | |
| 150 && (probe->defineThreadQ() == NULL) && (probe->definer() == NULL)) { | |
| 151 remove_entry(index, hash, name, loader); | |
| 152 } | |
| 153 } | |
| 154 } | |
| 155 | |
| 156 PlaceholderTable::PlaceholderTable(int table_size) | |
| 157 : TwoOopHashtable(table_size, sizeof(PlaceholderEntry)) { | |
| 158 } | |
| 159 | |
| 160 | |
| 161 void PlaceholderTable::oops_do(OopClosure* f) { | |
| 162 for (int index = 0; index < table_size(); index++) { | |
| 163 for (PlaceholderEntry* probe = bucket(index); | |
| 164 probe != NULL; | |
| 165 probe = probe->next()) { | |
| 166 probe->oops_do(f); | |
| 167 } | |
| 168 } | |
| 169 } | |
| 170 | |
| 171 | |
| 172 void PlaceholderEntry::oops_do(OopClosure* blk) { | |
| 173 assert(klass() != NULL, "should have a non-null klass"); | |
| 174 blk->do_oop((oop*)klass_addr()); | |
| 175 if (_loader != NULL) { | |
| 176 blk->do_oop(loader_addr()); | |
| 177 } | |
| 178 if (_supername != NULL) { | |
| 179 blk->do_oop((oop*)supername_addr()); | |
| 180 } | |
| 181 if (_instanceKlass != NULL) { | |
| 182 blk->do_oop((oop*)instanceKlass_addr()); | |
| 183 } | |
| 184 } | |
| 185 | |
| 186 // do all entries in the placeholder table | |
| 187 void PlaceholderTable::entries_do(void f(symbolOop, oop)) { | |
| 188 for (int index = 0; index < table_size(); index++) { | |
| 189 for (PlaceholderEntry* probe = bucket(index); | |
| 190 probe != NULL; | |
| 191 probe = probe->next()) { | |
| 192 f(probe->klass(), probe->loader()); | |
| 193 } | |
| 194 } | |
| 195 } | |
| 196 | |
| 197 | |
| 198 #ifndef PRODUCT | |
| 199 // Note, doesn't append a cr | |
| 200 void PlaceholderEntry::print() const { | |
| 201 klass()->print_value(); | |
| 202 if (loader() != NULL) { | |
| 203 tty->print(", loader "); | |
| 204 loader()->print_value(); | |
| 205 } | |
| 206 if (supername() != NULL) { | |
| 207 tty->print(", supername "); | |
| 208 supername()->print_value(); | |
| 209 } | |
| 210 if (definer() != NULL) { | |
| 211 tty->print(", definer "); | |
| 212 definer()->print_value(); | |
| 213 } | |
| 214 if (instanceKlass() != NULL) { | |
| 215 tty->print(", instanceKlass "); | |
| 216 instanceKlass()->print_value(); | |
| 217 } | |
| 218 tty->print("\n"); | |
| 219 tty->print("loadInstanceThreadQ threads:"); | |
| 220 loadInstanceThreadQ()->printActionQ(); | |
| 221 tty->print("\n"); | |
| 222 tty->print("superThreadQ threads:"); | |
| 223 superThreadQ()->printActionQ(); | |
| 224 tty->print("\n"); | |
| 225 tty->print("defineThreadQ threads:"); | |
| 226 defineThreadQ()->printActionQ(); | |
| 227 tty->print("\n"); | |
| 228 } | |
| 229 #endif | |
| 230 | |
| 231 void PlaceholderEntry::verify() const { | |
| 232 guarantee(loader() == NULL || loader()->is_instance(), | |
| 233 "checking type of _loader"); | |
| 234 guarantee(instanceKlass() == NULL | |
| 235 || Klass::cast(instanceKlass())->oop_is_instance(), | |
| 236 "checking type of instanceKlass result"); | |
| 237 klass()->verify(); | |
| 238 } | |
| 239 | |
| 240 void PlaceholderTable::verify() { | |
| 241 int element_count = 0; | |
| 242 for (int pindex = 0; pindex < table_size(); pindex++) { | |
| 243 for (PlaceholderEntry* probe = bucket(pindex); | |
| 244 probe != NULL; | |
| 245 probe = probe->next()) { | |
| 246 probe->verify(); | |
| 247 element_count++; // both klasses and place holders count | |
| 248 } | |
| 249 } | |
| 250 guarantee(number_of_entries() == element_count, | |
| 251 "Verify of system dictionary failed"); | |
| 252 } | |
| 253 | |
| 254 | |
| 255 #ifndef PRODUCT | |
| 256 void PlaceholderTable::print() { | |
| 257 for (int pindex = 0; pindex < table_size(); pindex++) { | |
| 258 for (PlaceholderEntry* probe = bucket(pindex); | |
| 259 probe != NULL; | |
| 260 probe = probe->next()) { | |
| 261 if (Verbose) tty->print("%4d: ", pindex); | |
| 262 tty->print(" place holder "); | |
| 263 | |
| 264 probe->print(); | |
| 265 tty->cr(); | |
| 266 } | |
| 267 } | |
| 268 } | |
| 269 #endif |