Mercurial > hg > truffle
annotate src/share/vm/classfile/placeholders.cpp @ 1972:f95d63e2154a
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
| author | stefank |
|---|---|
| date | Tue, 23 Nov 2010 13:22:55 -0800 |
| parents | c18cbe5936b8 |
| children | 3582bf76420e |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2003, 2010, 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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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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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 | |
| 34 PlaceholderEntry* PlaceholderTable::new_entry(int hash, symbolOop name, | |
| 35 oop loader, bool havesupername, | |
| 36 symbolOop supername) { | |
| 37 PlaceholderEntry* entry = (PlaceholderEntry*)Hashtable::new_entry(hash, name); | |
| 38 entry->set_loader(loader); | |
| 39 entry->set_havesupername(havesupername); | |
| 40 entry->set_supername(supername); | |
| 41 entry->set_superThreadQ(NULL); | |
| 42 entry->set_loadInstanceThreadQ(NULL); | |
| 43 entry->set_defineThreadQ(NULL); | |
| 44 entry->set_definer(NULL); | |
| 45 entry->set_instanceKlass(NULL); | |
| 46 return entry; | |
| 47 } | |
| 48 | |
| 49 | |
| 50 // Placeholder objects represent classes currently being loaded. | |
| 51 // All threads examining the placeholder table must hold the | |
| 52 // SystemDictionary_lock, so we don't need special precautions | |
| 53 // on store ordering here. | |
| 54 void PlaceholderTable::add_entry(int index, unsigned int hash, | |
| 55 symbolHandle class_name, Handle class_loader, | |
| 56 bool havesupername, symbolHandle supername){ | |
| 57 assert_locked_or_safepoint(SystemDictionary_lock); | |
| 58 assert(!class_name.is_null(), "adding NULL obj"); | |
| 59 | |
| 60 // Both readers and writers are locked so it's safe to just | |
| 61 // create the placeholder and insert it in the list without a membar. | |
| 62 PlaceholderEntry* entry = new_entry(hash, class_name(), class_loader(), havesupername, supername()); | |
| 63 add_entry(index, entry); | |
| 64 } | |
| 65 | |
| 66 | |
| 67 // Remove a placeholder object. | |
| 68 void PlaceholderTable::remove_entry(int index, unsigned int hash, | |
| 69 symbolHandle class_name, | |
| 70 Handle class_loader) { | |
| 71 assert_locked_or_safepoint(SystemDictionary_lock); | |
| 72 PlaceholderEntry** p = bucket_addr(index); | |
| 73 while (*p) { | |
| 74 PlaceholderEntry *probe = *p; | |
| 75 if (probe->hash() == hash && probe->equals(class_name(), class_loader())) { | |
| 76 // Delete entry | |
| 77 *p = probe->next(); | |
| 78 free_entry(probe); | |
| 79 return; | |
| 80 } | |
| 81 p = probe->next_addr(); | |
| 82 } | |
| 83 } | |
| 84 | |
| 85 PlaceholderEntry* PlaceholderTable::get_entry(int index, unsigned int hash, | |
| 86 symbolHandle class_name, | |
| 87 Handle class_loader) { | |
| 88 assert_locked_or_safepoint(SystemDictionary_lock); | |
| 89 | |
| 90 symbolOop class_name_ = class_name(); | |
| 91 oop class_loader_ = class_loader(); | |
| 92 | |
| 93 for (PlaceholderEntry *place_probe = bucket(index); | |
| 94 place_probe != NULL; | |
| 95 place_probe = place_probe->next()) { | |
| 96 if (place_probe->hash() == hash && | |
| 97 place_probe->equals(class_name_, class_loader_)) { | |
| 98 return place_probe; | |
| 99 } | |
| 100 } | |
| 101 return NULL; | |
| 102 } | |
| 103 | |
| 104 symbolOop PlaceholderTable::find_entry(int index, unsigned int hash, | |
| 105 symbolHandle class_name, | |
| 106 Handle class_loader) { | |
| 107 PlaceholderEntry* probe = get_entry(index, hash, class_name, class_loader); | |
| 108 return (probe? probe->klass(): symbolOop(NULL)); | |
| 109 } | |
| 110 | |
| 111 // find_and_add returns probe pointer - old or new | |
| 112 // If no entry exists, add a placeholder entry | |
| 113 // If entry exists, reuse entry | |
| 114 // For both, push SeenThread for classloadAction | |
| 115 // if havesupername: this is used for circularity for instanceklass loading | |
| 116 PlaceholderEntry* PlaceholderTable::find_and_add(int index, unsigned int hash, symbolHandle name, Handle loader, classloadAction action, symbolHandle supername, Thread* thread) { | |
| 117 PlaceholderEntry* probe = get_entry(index, hash, name, loader); | |
| 118 if (probe == NULL) { | |
| 119 // Nothing found, add place holder | |
| 120 add_entry(index, hash, name, loader, (action == LOAD_SUPER), supername); | |
| 121 probe = get_entry(index, hash, name, loader); | |
| 122 } else { | |
| 123 if (action == LOAD_SUPER) { | |
| 124 probe->set_havesupername(true); | |
| 125 probe->set_supername(supername()); | |
| 126 } | |
| 127 } | |
| 128 if (probe) probe->add_seen_thread(thread, action); | |
| 129 return probe; | |
| 130 } | |
| 131 | |
| 132 | |
| 133 // placeholder used to track class loading internal states | |
| 134 // placeholder existence now for loading superclass/superinterface | |
| 135 // superthreadQ tracks class circularity, while loading superclass/superinterface | |
| 136 // loadInstanceThreadQ tracks load_instance_class calls | |
| 137 // definer() tracks the single thread that owns define token | |
| 138 // defineThreadQ tracks waiters on defining thread's results | |
| 139 // 1st claimant creates placeholder | |
| 140 // find_and_add adds SeenThread entry for appropriate queue | |
| 141 // All claimants remove SeenThread after completing action | |
| 142 // On removal: if definer and all queues empty, remove entry | |
| 143 // Note: you can be in both placeholders and systemDictionary | |
| 144 // see parse_stream for redefine classes | |
| 145 // Therefore - must always check SD first | |
| 146 // Ignores the case where entry is not found | |
| 147 void PlaceholderTable::find_and_remove(int index, unsigned int hash, | |
| 148 symbolHandle name, Handle loader, Thread* thread) { | |
| 149 assert_locked_or_safepoint(SystemDictionary_lock); | |
| 150 PlaceholderEntry *probe = get_entry(index, hash, name, loader); | |
| 151 if (probe != NULL) { | |
| 152 // No other threads using this entry | |
| 153 if ((probe->superThreadQ() == NULL) && (probe->loadInstanceThreadQ() == NULL) | |
| 154 && (probe->defineThreadQ() == NULL) && (probe->definer() == NULL)) { | |
| 155 remove_entry(index, hash, name, loader); | |
| 156 } | |
| 157 } | |
| 158 } | |
| 159 | |
| 160 PlaceholderTable::PlaceholderTable(int table_size) | |
| 161 : TwoOopHashtable(table_size, sizeof(PlaceholderEntry)) { | |
| 162 } | |
| 163 | |
| 164 | |
| 165 void PlaceholderTable::oops_do(OopClosure* f) { | |
| 166 for (int index = 0; index < table_size(); index++) { | |
| 167 for (PlaceholderEntry* probe = bucket(index); | |
| 168 probe != NULL; | |
| 169 probe = probe->next()) { | |
| 170 probe->oops_do(f); | |
| 171 } | |
| 172 } | |
| 173 } | |
| 174 | |
| 175 | |
| 176 void PlaceholderEntry::oops_do(OopClosure* blk) { | |
| 177 assert(klass() != NULL, "should have a non-null klass"); | |
| 178 blk->do_oop((oop*)klass_addr()); | |
| 179 if (_loader != NULL) { | |
| 180 blk->do_oop(loader_addr()); | |
| 181 } | |
| 182 if (_supername != NULL) { | |
| 183 blk->do_oop((oop*)supername_addr()); | |
| 184 } | |
| 185 if (_instanceKlass != NULL) { | |
| 186 blk->do_oop((oop*)instanceKlass_addr()); | |
| 187 } | |
| 188 } | |
| 189 | |
| 190 // do all entries in the placeholder table | |
| 191 void PlaceholderTable::entries_do(void f(symbolOop, oop)) { | |
| 192 for (int index = 0; index < table_size(); index++) { | |
| 193 for (PlaceholderEntry* probe = bucket(index); | |
| 194 probe != NULL; | |
| 195 probe = probe->next()) { | |
| 196 f(probe->klass(), probe->loader()); | |
| 197 } | |
| 198 } | |
| 199 } | |
| 200 | |
| 201 | |
| 202 #ifndef PRODUCT | |
| 203 // Note, doesn't append a cr | |
| 204 void PlaceholderEntry::print() const { | |
| 205 klass()->print_value(); | |
| 206 if (loader() != NULL) { | |
| 207 tty->print(", loader "); | |
| 208 loader()->print_value(); | |
| 209 } | |
| 210 if (supername() != NULL) { | |
| 211 tty->print(", supername "); | |
| 212 supername()->print_value(); | |
| 213 } | |
| 214 if (definer() != NULL) { | |
| 215 tty->print(", definer "); | |
| 216 definer()->print_value(); | |
| 217 } | |
| 218 if (instanceKlass() != NULL) { | |
| 219 tty->print(", instanceKlass "); | |
| 220 instanceKlass()->print_value(); | |
| 221 } | |
| 222 tty->print("\n"); | |
| 223 tty->print("loadInstanceThreadQ threads:"); | |
| 224 loadInstanceThreadQ()->printActionQ(); | |
| 225 tty->print("\n"); | |
| 226 tty->print("superThreadQ threads:"); | |
| 227 superThreadQ()->printActionQ(); | |
| 228 tty->print("\n"); | |
| 229 tty->print("defineThreadQ threads:"); | |
| 230 defineThreadQ()->printActionQ(); | |
| 231 tty->print("\n"); | |
| 232 } | |
| 233 #endif | |
| 234 | |
| 235 void PlaceholderEntry::verify() const { | |
| 236 guarantee(loader() == NULL || loader()->is_instance(), | |
| 237 "checking type of _loader"); | |
| 238 guarantee(instanceKlass() == NULL | |
| 239 || Klass::cast(instanceKlass())->oop_is_instance(), | |
| 240 "checking type of instanceKlass result"); | |
| 241 klass()->verify(); | |
| 242 } | |
| 243 | |
| 244 void PlaceholderTable::verify() { | |
| 245 int element_count = 0; | |
| 246 for (int pindex = 0; pindex < table_size(); pindex++) { | |
| 247 for (PlaceholderEntry* probe = bucket(pindex); | |
| 248 probe != NULL; | |
| 249 probe = probe->next()) { | |
| 250 probe->verify(); | |
| 251 element_count++; // both klasses and place holders count | |
| 252 } | |
| 253 } | |
| 254 guarantee(number_of_entries() == element_count, | |
| 255 "Verify of system dictionary failed"); | |
| 256 } | |
| 257 | |
| 258 | |
| 259 #ifndef PRODUCT | |
| 260 void PlaceholderTable::print() { | |
| 261 for (int pindex = 0; pindex < table_size(); pindex++) { | |
| 262 for (PlaceholderEntry* probe = bucket(pindex); | |
| 263 probe != NULL; | |
| 264 probe = probe->next()) { | |
| 265 if (Verbose) tty->print("%4d: ", pindex); | |
| 266 tty->print(" place holder "); | |
| 267 | |
| 268 probe->print(); | |
| 269 tty->cr(); | |
| 270 } | |
| 271 } | |
| 272 } | |
| 273 #endif |