Fri, 06 Mar 2015 16:47:46 +0100
8074561: Wrong volatile qualifier for field ClassLoaderDataGraphKlassIteratorAtomic::_next_klass
Reviewed-by: mgerdin, stefank
duke@435 | 1 | /* |
coleenp@6316 | 2 | * Copyright (c) 2003, 2014, Oracle and/or its affiliates. All rights reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
trims@1907 | 21 | * questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
stefank@2314 | 25 | #include "precompiled.hpp" |
stefank@2314 | 26 | #include "classfile/dictionary.hpp" |
stefank@2314 | 27 | #include "classfile/systemDictionary.hpp" |
tschatzl@5862 | 28 | #include "memory/iterator.hpp" |
stefank@2314 | 29 | #include "oops/oop.inline.hpp" |
stefank@2314 | 30 | #include "prims/jvmtiRedefineClassesTrace.hpp" |
goetz@6911 | 31 | #include "runtime/orderAccess.inline.hpp" |
stefank@2314 | 32 | #include "utilities/hashtable.inline.hpp" |
duke@435 | 33 | |
drchase@6680 | 34 | PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
duke@435 | 35 | |
duke@435 | 36 | DictionaryEntry* Dictionary::_current_class_entry = NULL; |
duke@435 | 37 | int Dictionary::_current_class_index = 0; |
duke@435 | 38 | |
duke@435 | 39 | |
duke@435 | 40 | Dictionary::Dictionary(int table_size) |
coleenp@4037 | 41 | : TwoOopHashtable<Klass*, mtClass>(table_size, sizeof(DictionaryEntry)) { |
duke@435 | 42 | _current_class_index = 0; |
duke@435 | 43 | _current_class_entry = NULL; |
tschatzl@5862 | 44 | _pd_cache_table = new ProtectionDomainCacheTable(defaultProtectionDomainCacheSize); |
duke@435 | 45 | }; |
duke@435 | 46 | |
duke@435 | 47 | |
zgu@3900 | 48 | Dictionary::Dictionary(int table_size, HashtableBucket<mtClass>* t, |
duke@435 | 49 | int number_of_entries) |
coleenp@4037 | 50 | : TwoOopHashtable<Klass*, mtClass>(table_size, sizeof(DictionaryEntry), t, number_of_entries) { |
duke@435 | 51 | _current_class_index = 0; |
duke@435 | 52 | _current_class_entry = NULL; |
tschatzl@5862 | 53 | _pd_cache_table = new ProtectionDomainCacheTable(defaultProtectionDomainCacheSize); |
duke@435 | 54 | }; |
duke@435 | 55 | |
tschatzl@5862 | 56 | ProtectionDomainCacheEntry* Dictionary::cache_get(oop protection_domain) { |
tschatzl@5862 | 57 | return _pd_cache_table->get(protection_domain); |
tschatzl@5862 | 58 | } |
duke@435 | 59 | |
coleenp@4037 | 60 | DictionaryEntry* Dictionary::new_entry(unsigned int hash, Klass* klass, |
coleenp@4037 | 61 | ClassLoaderData* loader_data) { |
coleenp@4037 | 62 | DictionaryEntry* entry = (DictionaryEntry*)Hashtable<Klass*, mtClass>::new_entry(hash, klass); |
coleenp@4037 | 63 | entry->set_loader_data(loader_data); |
duke@435 | 64 | entry->set_pd_set(NULL); |
coleenp@4037 | 65 | assert(klass->oop_is_instance(), "Must be"); |
duke@435 | 66 | return entry; |
duke@435 | 67 | } |
duke@435 | 68 | |
duke@435 | 69 | |
duke@435 | 70 | void Dictionary::free_entry(DictionaryEntry* entry) { |
duke@435 | 71 | // avoid recursion when deleting linked list |
duke@435 | 72 | while (entry->pd_set() != NULL) { |
duke@435 | 73 | ProtectionDomainEntry* to_delete = entry->pd_set(); |
duke@435 | 74 | entry->set_pd_set(to_delete->next()); |
duke@435 | 75 | delete to_delete; |
duke@435 | 76 | } |
coleenp@4037 | 77 | Hashtable<Klass*, mtClass>::free_entry(entry); |
duke@435 | 78 | } |
duke@435 | 79 | |
duke@435 | 80 | |
duke@435 | 81 | bool DictionaryEntry::contains_protection_domain(oop protection_domain) const { |
duke@435 | 82 | #ifdef ASSERT |
coleenp@4037 | 83 | if (protection_domain == InstanceKlass::cast(klass())->protection_domain()) { |
duke@435 | 84 | // Ensure this doesn't show up in the pd_set (invariant) |
duke@435 | 85 | bool in_pd_set = false; |
duke@435 | 86 | for (ProtectionDomainEntry* current = _pd_set; |
duke@435 | 87 | current != NULL; |
duke@435 | 88 | current = current->next()) { |
duke@435 | 89 | if (current->protection_domain() == protection_domain) { |
duke@435 | 90 | in_pd_set = true; |
duke@435 | 91 | break; |
duke@435 | 92 | } |
duke@435 | 93 | } |
duke@435 | 94 | if (in_pd_set) { |
duke@435 | 95 | assert(false, "A klass's protection domain should not show up " |
duke@435 | 96 | "in its sys. dict. PD set"); |
duke@435 | 97 | } |
duke@435 | 98 | } |
duke@435 | 99 | #endif /* ASSERT */ |
duke@435 | 100 | |
coleenp@4037 | 101 | if (protection_domain == InstanceKlass::cast(klass())->protection_domain()) { |
duke@435 | 102 | // Succeeds trivially |
duke@435 | 103 | return true; |
duke@435 | 104 | } |
duke@435 | 105 | |
duke@435 | 106 | for (ProtectionDomainEntry* current = _pd_set; |
duke@435 | 107 | current != NULL; |
duke@435 | 108 | current = current->next()) { |
duke@435 | 109 | if (current->protection_domain() == protection_domain) return true; |
duke@435 | 110 | } |
duke@435 | 111 | return false; |
duke@435 | 112 | } |
duke@435 | 113 | |
duke@435 | 114 | |
tschatzl@5862 | 115 | void DictionaryEntry::add_protection_domain(Dictionary* dict, oop protection_domain) { |
duke@435 | 116 | assert_locked_or_safepoint(SystemDictionary_lock); |
duke@435 | 117 | if (!contains_protection_domain(protection_domain)) { |
tschatzl@5862 | 118 | ProtectionDomainCacheEntry* entry = dict->cache_get(protection_domain); |
duke@435 | 119 | ProtectionDomainEntry* new_head = |
tschatzl@5862 | 120 | new ProtectionDomainEntry(entry, _pd_set); |
duke@435 | 121 | // Warning: Preserve store ordering. The SystemDictionary is read |
duke@435 | 122 | // without locks. The new ProtectionDomainEntry must be |
duke@435 | 123 | // complete before other threads can be allowed to see it |
duke@435 | 124 | // via a store to _pd_set. |
duke@435 | 125 | OrderAccess::release_store_ptr(&_pd_set, new_head); |
duke@435 | 126 | } |
duke@435 | 127 | if (TraceProtectionDomainVerification && WizardMode) { |
duke@435 | 128 | print(); |
duke@435 | 129 | } |
duke@435 | 130 | } |
duke@435 | 131 | |
duke@435 | 132 | |
thartmann@7064 | 133 | void Dictionary::do_unloading() { |
jcoomes@1844 | 134 | assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
duke@435 | 135 | |
duke@435 | 136 | // Remove unloadable entries and classes from system dictionary |
duke@435 | 137 | // The placeholder array has been handled in always_strong_oops_do. |
duke@435 | 138 | DictionaryEntry* probe = NULL; |
thartmann@7064 | 139 | for (int index = 0; index < table_size(); index++) { |
duke@435 | 140 | for (DictionaryEntry** p = bucket_addr(index); *p != NULL; ) { |
duke@435 | 141 | probe = *p; |
coleenp@4037 | 142 | Klass* e = probe->klass(); |
coleenp@4037 | 143 | ClassLoaderData* loader_data = probe->loader_data(); |
duke@435 | 144 | |
coleenp@4037 | 145 | InstanceKlass* ik = InstanceKlass::cast(e); |
duke@435 | 146 | |
duke@435 | 147 | // Non-unloadable classes were handled in always_strong_oops_do |
coleenp@4037 | 148 | if (!is_strongly_reachable(loader_data, e)) { |
duke@435 | 149 | // Entry was not visited in phase1 (negated test from phase1) |
coleenp@4037 | 150 | assert(!loader_data->is_the_null_class_loader_data(), "unloading entry with null class loader"); |
coleenp@4037 | 151 | ClassLoaderData* k_def_class_loader_data = ik->class_loader_data(); |
duke@435 | 152 | |
duke@435 | 153 | // Do we need to delete this system dictionary entry? |
duke@435 | 154 | bool purge_entry = false; |
duke@435 | 155 | |
duke@435 | 156 | // Do we need to delete this system dictionary entry? |
coleenp@4037 | 157 | if (loader_data->is_unloading()) { |
duke@435 | 158 | // If the loader is not live this entry should always be |
thartmann@7064 | 159 | // removed (will never be looked up again). |
duke@435 | 160 | purge_entry = true; |
duke@435 | 161 | } else { |
duke@435 | 162 | // The loader in this entry is alive. If the klass is dead, |
coleenp@4037 | 163 | // (determined by checking the defining class loader) |
duke@435 | 164 | // the loader must be an initiating loader (rather than the |
duke@435 | 165 | // defining loader). Remove this entry. |
coleenp@4037 | 166 | if (k_def_class_loader_data->is_unloading()) { |
coleenp@4037 | 167 | // If we get here, the class_loader_data must not be the defining |
duke@435 | 168 | // loader, it must be an initiating one. |
coleenp@4037 | 169 | assert(k_def_class_loader_data != loader_data, |
duke@435 | 170 | "cannot have live defining loader and unreachable klass"); |
duke@435 | 171 | // Loader is live, but class and its defining loader are dead. |
duke@435 | 172 | // Remove the entry. The class is going away. |
duke@435 | 173 | purge_entry = true; |
duke@435 | 174 | } |
duke@435 | 175 | } |
duke@435 | 176 | |
duke@435 | 177 | if (purge_entry) { |
duke@435 | 178 | *p = probe->next(); |
duke@435 | 179 | if (probe == _current_class_entry) { |
duke@435 | 180 | _current_class_entry = NULL; |
duke@435 | 181 | } |
duke@435 | 182 | free_entry(probe); |
duke@435 | 183 | continue; |
duke@435 | 184 | } |
duke@435 | 185 | } |
duke@435 | 186 | p = probe->next_addr(); |
duke@435 | 187 | } |
duke@435 | 188 | } |
duke@435 | 189 | } |
duke@435 | 190 | |
stefank@6992 | 191 | void Dictionary::roots_oops_do(OopClosure* strong, OopClosure* weak) { |
stefank@6992 | 192 | // Skip the strong roots probe marking if the closures are the same. |
stefank@6992 | 193 | if (strong == weak) { |
stefank@6992 | 194 | oops_do(strong); |
stefank@6992 | 195 | return; |
stefank@6992 | 196 | } |
stefank@6992 | 197 | |
stefank@6992 | 198 | for (int index = 0; index < table_size(); index++) { |
stefank@6992 | 199 | for (DictionaryEntry *probe = bucket(index); |
stefank@6992 | 200 | probe != NULL; |
stefank@6992 | 201 | probe = probe->next()) { |
stefank@6992 | 202 | Klass* e = probe->klass(); |
stefank@6992 | 203 | ClassLoaderData* loader_data = probe->loader_data(); |
stefank@6992 | 204 | if (is_strongly_reachable(loader_data, e)) { |
stefank@6992 | 205 | probe->set_strongly_reachable(); |
stefank@6992 | 206 | } |
stefank@6992 | 207 | } |
stefank@6992 | 208 | } |
stefank@6992 | 209 | _pd_cache_table->roots_oops_do(strong, weak); |
stefank@6992 | 210 | } |
duke@435 | 211 | |
iklam@7089 | 212 | void Dictionary::remove_classes_in_error_state() { |
iklam@7089 | 213 | assert(DumpSharedSpaces, "supported only when dumping"); |
iklam@7089 | 214 | DictionaryEntry* probe = NULL; |
iklam@7089 | 215 | for (int index = 0; index < table_size(); index++) { |
iklam@7089 | 216 | for (DictionaryEntry** p = bucket_addr(index); *p != NULL; ) { |
iklam@7089 | 217 | probe = *p; |
iklam@7089 | 218 | InstanceKlass* ik = InstanceKlass::cast(probe->klass()); |
iklam@7089 | 219 | if (ik->is_in_error_state()) { // purge this entry |
iklam@7089 | 220 | *p = probe->next(); |
iklam@7089 | 221 | if (probe == _current_class_entry) { |
iklam@7089 | 222 | _current_class_entry = NULL; |
iklam@7089 | 223 | } |
iklam@7089 | 224 | free_entry(probe); |
iklam@7089 | 225 | ResourceMark rm; |
jiangli@7363 | 226 | tty->print_cr("Preload Warning: Removed error class: %s", ik->external_name()); |
iklam@7089 | 227 | continue; |
iklam@7089 | 228 | } |
iklam@7089 | 229 | |
iklam@7089 | 230 | p = probe->next_addr(); |
iklam@7089 | 231 | } |
iklam@7089 | 232 | } |
iklam@7089 | 233 | } |
iklam@7089 | 234 | |
coleenp@4037 | 235 | void Dictionary::always_strong_oops_do(OopClosure* blk) { |
tschatzl@5862 | 236 | // Follow all system classes and temporary placeholders in dictionary; only |
tschatzl@5862 | 237 | // protection domain oops contain references into the heap. In a first |
tschatzl@5862 | 238 | // pass over the system dictionary determine which need to be treated as |
tschatzl@5862 | 239 | // strongly reachable and mark them as such. |
duke@435 | 240 | for (int index = 0; index < table_size(); index++) { |
duke@435 | 241 | for (DictionaryEntry *probe = bucket(index); |
duke@435 | 242 | probe != NULL; |
duke@435 | 243 | probe = probe->next()) { |
coleenp@4037 | 244 | Klass* e = probe->klass(); |
coleenp@4037 | 245 | ClassLoaderData* loader_data = probe->loader_data(); |
coleenp@4037 | 246 | if (is_strongly_reachable(loader_data, e)) { |
tschatzl@5862 | 247 | probe->set_strongly_reachable(); |
duke@435 | 248 | } |
duke@435 | 249 | } |
duke@435 | 250 | } |
tschatzl@5862 | 251 | // Then iterate over the protection domain cache to apply the closure on the |
tschatzl@5862 | 252 | // previously marked ones. |
tschatzl@5862 | 253 | _pd_cache_table->always_strong_oops_do(blk); |
duke@435 | 254 | } |
duke@435 | 255 | |
duke@435 | 256 | |
coleenp@4037 | 257 | void Dictionary::always_strong_classes_do(KlassClosure* closure) { |
coleenp@4037 | 258 | // Follow all system classes and temporary placeholders in dictionary |
duke@435 | 259 | for (int index = 0; index < table_size(); index++) { |
duke@435 | 260 | for (DictionaryEntry* probe = bucket(index); |
duke@435 | 261 | probe != NULL; |
duke@435 | 262 | probe = probe->next()) { |
coleenp@4037 | 263 | Klass* e = probe->klass(); |
coleenp@4037 | 264 | ClassLoaderData* loader_data = probe->loader_data(); |
coleenp@4037 | 265 | if (is_strongly_reachable(loader_data, e)) { |
coleenp@4037 | 266 | closure->do_klass(e); |
coleenp@4037 | 267 | } |
coleenp@4037 | 268 | } |
coleenp@4037 | 269 | } |
coleenp@4037 | 270 | } |
coleenp@4037 | 271 | |
coleenp@4037 | 272 | |
coleenp@4037 | 273 | // Just the classes from defining class loaders |
coleenp@4037 | 274 | void Dictionary::classes_do(void f(Klass*)) { |
coleenp@4037 | 275 | for (int index = 0; index < table_size(); index++) { |
coleenp@4037 | 276 | for (DictionaryEntry* probe = bucket(index); |
coleenp@4037 | 277 | probe != NULL; |
coleenp@4037 | 278 | probe = probe->next()) { |
coleenp@4037 | 279 | Klass* k = probe->klass(); |
coleenp@4037 | 280 | if (probe->loader_data() == InstanceKlass::cast(k)->class_loader_data()) { |
duke@435 | 281 | f(k); |
duke@435 | 282 | } |
duke@435 | 283 | } |
duke@435 | 284 | } |
duke@435 | 285 | } |
duke@435 | 286 | |
duke@435 | 287 | // Added for initialize_itable_for_klass to handle exceptions |
duke@435 | 288 | // Just the classes from defining class loaders |
coleenp@4037 | 289 | void Dictionary::classes_do(void f(Klass*, TRAPS), TRAPS) { |
duke@435 | 290 | for (int index = 0; index < table_size(); index++) { |
duke@435 | 291 | for (DictionaryEntry* probe = bucket(index); |
duke@435 | 292 | probe != NULL; |
duke@435 | 293 | probe = probe->next()) { |
coleenp@4037 | 294 | Klass* k = probe->klass(); |
coleenp@4037 | 295 | if (probe->loader_data() == InstanceKlass::cast(k)->class_loader_data()) { |
duke@435 | 296 | f(k, CHECK); |
duke@435 | 297 | } |
duke@435 | 298 | } |
duke@435 | 299 | } |
duke@435 | 300 | } |
duke@435 | 301 | |
duke@435 | 302 | // All classes, and their class loaders |
duke@435 | 303 | // Don't iterate over placeholders |
coleenp@4037 | 304 | void Dictionary::classes_do(void f(Klass*, ClassLoaderData*)) { |
duke@435 | 305 | for (int index = 0; index < table_size(); index++) { |
duke@435 | 306 | for (DictionaryEntry* probe = bucket(index); |
duke@435 | 307 | probe != NULL; |
duke@435 | 308 | probe = probe->next()) { |
coleenp@4037 | 309 | Klass* k = probe->klass(); |
coleenp@4037 | 310 | f(k, probe->loader_data()); |
duke@435 | 311 | } |
duke@435 | 312 | } |
duke@435 | 313 | } |
duke@435 | 314 | |
duke@435 | 315 | void Dictionary::oops_do(OopClosure* f) { |
tschatzl@5862 | 316 | // Only the protection domain oops contain references into the heap. Iterate |
tschatzl@5862 | 317 | // over all of them. |
tschatzl@5862 | 318 | _pd_cache_table->oops_do(f); |
duke@435 | 319 | } |
duke@435 | 320 | |
coleenp@4037 | 321 | void Dictionary::methods_do(void f(Method*)) { |
duke@435 | 322 | for (int index = 0; index < table_size(); index++) { |
duke@435 | 323 | for (DictionaryEntry* probe = bucket(index); |
duke@435 | 324 | probe != NULL; |
duke@435 | 325 | probe = probe->next()) { |
coleenp@4037 | 326 | Klass* k = probe->klass(); |
coleenp@4037 | 327 | if (probe->loader_data() == InstanceKlass::cast(k)->class_loader_data()) { |
duke@435 | 328 | // only take klass is we have the entry with the defining class loader |
coleenp@4037 | 329 | InstanceKlass::cast(k)->methods_do(f); |
duke@435 | 330 | } |
duke@435 | 331 | } |
duke@435 | 332 | } |
duke@435 | 333 | } |
duke@435 | 334 | |
tschatzl@5862 | 335 | void Dictionary::unlink(BoolObjectClosure* is_alive) { |
tschatzl@5862 | 336 | // Only the protection domain cache table may contain references to the heap |
tschatzl@5862 | 337 | // that need to be unlinked. |
tschatzl@5862 | 338 | _pd_cache_table->unlink(is_alive); |
tschatzl@5862 | 339 | } |
duke@435 | 340 | |
coleenp@4037 | 341 | Klass* Dictionary::try_get_next_class() { |
duke@435 | 342 | while (true) { |
duke@435 | 343 | if (_current_class_entry != NULL) { |
coleenp@4037 | 344 | Klass* k = _current_class_entry->klass(); |
duke@435 | 345 | _current_class_entry = _current_class_entry->next(); |
duke@435 | 346 | return k; |
duke@435 | 347 | } |
duke@435 | 348 | _current_class_index = (_current_class_index + 1) % table_size(); |
duke@435 | 349 | _current_class_entry = bucket(_current_class_index); |
duke@435 | 350 | } |
duke@435 | 351 | // never reached |
duke@435 | 352 | } |
duke@435 | 353 | |
duke@435 | 354 | // Add a loaded class to the system dictionary. |
duke@435 | 355 | // Readers of the SystemDictionary aren't always locked, so _buckets |
duke@435 | 356 | // is volatile. The store of the next field in the constructor is |
duke@435 | 357 | // also cast to volatile; we do this to ensure store order is maintained |
duke@435 | 358 | // by the compilers. |
duke@435 | 359 | |
coleenp@4037 | 360 | void Dictionary::add_klass(Symbol* class_name, ClassLoaderData* loader_data, |
duke@435 | 361 | KlassHandle obj) { |
duke@435 | 362 | assert_locked_or_safepoint(SystemDictionary_lock); |
duke@435 | 363 | assert(obj() != NULL, "adding NULL obj"); |
hseigel@4278 | 364 | assert(obj()->name() == class_name, "sanity check on name"); |
stefank@4667 | 365 | assert(loader_data != NULL, "Must be non-NULL"); |
duke@435 | 366 | |
coleenp@4037 | 367 | unsigned int hash = compute_hash(class_name, loader_data); |
duke@435 | 368 | int index = hash_to_index(hash); |
coleenp@4037 | 369 | DictionaryEntry* entry = new_entry(hash, obj(), loader_data); |
duke@435 | 370 | add_entry(index, entry); |
duke@435 | 371 | } |
duke@435 | 372 | |
duke@435 | 373 | |
duke@435 | 374 | // This routine does not lock the system dictionary. |
duke@435 | 375 | // |
duke@435 | 376 | // Since readers don't hold a lock, we must make sure that system |
duke@435 | 377 | // dictionary entries are only removed at a safepoint (when only one |
duke@435 | 378 | // thread is running), and are added to in a safe way (all links must |
duke@435 | 379 | // be updated in an MT-safe manner). |
duke@435 | 380 | // |
duke@435 | 381 | // Callers should be aware that an entry could be added just after |
duke@435 | 382 | // _buckets[index] is read here, so the caller will not see the new entry. |
duke@435 | 383 | DictionaryEntry* Dictionary::get_entry(int index, unsigned int hash, |
coleenp@2497 | 384 | Symbol* class_name, |
coleenp@4037 | 385 | ClassLoaderData* loader_data) { |
duke@435 | 386 | debug_only(_lookup_count++); |
duke@435 | 387 | for (DictionaryEntry* entry = bucket(index); |
duke@435 | 388 | entry != NULL; |
duke@435 | 389 | entry = entry->next()) { |
coleenp@4037 | 390 | if (entry->hash() == hash && entry->equals(class_name, loader_data)) { |
duke@435 | 391 | return entry; |
duke@435 | 392 | } |
duke@435 | 393 | debug_only(_lookup_length++); |
duke@435 | 394 | } |
duke@435 | 395 | return NULL; |
duke@435 | 396 | } |
duke@435 | 397 | |
duke@435 | 398 | |
coleenp@4037 | 399 | Klass* Dictionary::find(int index, unsigned int hash, Symbol* name, |
coleenp@4037 | 400 | ClassLoaderData* loader_data, Handle protection_domain, TRAPS) { |
coleenp@4037 | 401 | DictionaryEntry* entry = get_entry(index, hash, name, loader_data); |
duke@435 | 402 | if (entry != NULL && entry->is_valid_protection_domain(protection_domain)) { |
duke@435 | 403 | return entry->klass(); |
duke@435 | 404 | } else { |
duke@435 | 405 | return NULL; |
duke@435 | 406 | } |
duke@435 | 407 | } |
duke@435 | 408 | |
duke@435 | 409 | |
coleenp@4037 | 410 | Klass* Dictionary::find_class(int index, unsigned int hash, |
coleenp@4037 | 411 | Symbol* name, ClassLoaderData* loader_data) { |
duke@435 | 412 | assert_locked_or_safepoint(SystemDictionary_lock); |
coleenp@4037 | 413 | assert (index == index_for(name, loader_data), "incorrect index?"); |
duke@435 | 414 | |
coleenp@4037 | 415 | DictionaryEntry* entry = get_entry(index, hash, name, loader_data); |
coleenp@4037 | 416 | return (entry != NULL) ? entry->klass() : (Klass*)NULL; |
duke@435 | 417 | } |
duke@435 | 418 | |
duke@435 | 419 | |
duke@435 | 420 | // Variant of find_class for shared classes. No locking required, as |
duke@435 | 421 | // that table is static. |
duke@435 | 422 | |
coleenp@4037 | 423 | Klass* Dictionary::find_shared_class(int index, unsigned int hash, |
coleenp@2497 | 424 | Symbol* name) { |
coleenp@4037 | 425 | assert (index == index_for(name, NULL), "incorrect index?"); |
duke@435 | 426 | |
coleenp@4037 | 427 | DictionaryEntry* entry = get_entry(index, hash, name, NULL); |
coleenp@4037 | 428 | return (entry != NULL) ? entry->klass() : (Klass*)NULL; |
duke@435 | 429 | } |
duke@435 | 430 | |
duke@435 | 431 | |
duke@435 | 432 | void Dictionary::add_protection_domain(int index, unsigned int hash, |
duke@435 | 433 | instanceKlassHandle klass, |
coleenp@4037 | 434 | ClassLoaderData* loader_data, Handle protection_domain, |
duke@435 | 435 | TRAPS) { |
coleenp@2497 | 436 | Symbol* klass_name = klass->name(); |
coleenp@4037 | 437 | DictionaryEntry* entry = get_entry(index, hash, klass_name, loader_data); |
duke@435 | 438 | |
duke@435 | 439 | assert(entry != NULL,"entry must be present, we just created it"); |
duke@435 | 440 | assert(protection_domain() != NULL, |
duke@435 | 441 | "real protection domain should be present"); |
duke@435 | 442 | |
tschatzl@5862 | 443 | entry->add_protection_domain(this, protection_domain()); |
duke@435 | 444 | |
duke@435 | 445 | assert(entry->contains_protection_domain(protection_domain()), |
duke@435 | 446 | "now protection domain should be present"); |
duke@435 | 447 | } |
duke@435 | 448 | |
duke@435 | 449 | |
duke@435 | 450 | bool Dictionary::is_valid_protection_domain(int index, unsigned int hash, |
coleenp@2497 | 451 | Symbol* name, |
coleenp@4037 | 452 | ClassLoaderData* loader_data, |
duke@435 | 453 | Handle protection_domain) { |
coleenp@4037 | 454 | DictionaryEntry* entry = get_entry(index, hash, name, loader_data); |
duke@435 | 455 | return entry->is_valid_protection_domain(protection_domain); |
duke@435 | 456 | } |
duke@435 | 457 | |
duke@435 | 458 | |
duke@435 | 459 | void Dictionary::reorder_dictionary() { |
duke@435 | 460 | |
duke@435 | 461 | // Copy all the dictionary entries into a single master list. |
duke@435 | 462 | |
duke@435 | 463 | DictionaryEntry* master_list = NULL; |
duke@435 | 464 | for (int i = 0; i < table_size(); ++i) { |
duke@435 | 465 | DictionaryEntry* p = bucket(i); |
duke@435 | 466 | while (p != NULL) { |
duke@435 | 467 | DictionaryEntry* tmp; |
duke@435 | 468 | tmp = p->next(); |
duke@435 | 469 | p->set_next(master_list); |
duke@435 | 470 | master_list = p; |
duke@435 | 471 | p = tmp; |
duke@435 | 472 | } |
duke@435 | 473 | set_entry(i, NULL); |
duke@435 | 474 | } |
duke@435 | 475 | |
duke@435 | 476 | // Add the dictionary entries back to the list in the correct buckets. |
duke@435 | 477 | while (master_list != NULL) { |
duke@435 | 478 | DictionaryEntry* p = master_list; |
duke@435 | 479 | master_list = master_list->next(); |
duke@435 | 480 | p->set_next(NULL); |
coleenp@4037 | 481 | Symbol* class_name = InstanceKlass::cast((Klass*)(p->klass()))->name(); |
coleenp@4037 | 482 | // Since the null class loader data isn't copied to the CDS archive, |
coleenp@4037 | 483 | // compute the hash with NULL for loader data. |
coleenp@4037 | 484 | unsigned int hash = compute_hash(class_name, NULL); |
duke@435 | 485 | int index = hash_to_index(hash); |
duke@435 | 486 | p->set_hash(hash); |
coleenp@4037 | 487 | p->set_loader_data(NULL); // loader_data isn't copied to CDS |
duke@435 | 488 | p->set_next(bucket(index)); |
duke@435 | 489 | set_entry(index, p); |
duke@435 | 490 | } |
duke@435 | 491 | } |
duke@435 | 492 | |
tschatzl@5862 | 493 | ProtectionDomainCacheTable::ProtectionDomainCacheTable(int table_size) |
tschatzl@5862 | 494 | : Hashtable<oop, mtClass>(table_size, sizeof(ProtectionDomainCacheEntry)) |
tschatzl@5862 | 495 | { |
tschatzl@5862 | 496 | } |
tschatzl@5862 | 497 | |
tschatzl@5862 | 498 | void ProtectionDomainCacheTable::unlink(BoolObjectClosure* is_alive) { |
tschatzl@5862 | 499 | assert(SafepointSynchronize::is_at_safepoint(), "must be"); |
tschatzl@5862 | 500 | for (int i = 0; i < table_size(); ++i) { |
tschatzl@5862 | 501 | ProtectionDomainCacheEntry** p = bucket_addr(i); |
tschatzl@5862 | 502 | ProtectionDomainCacheEntry* entry = bucket(i); |
tschatzl@5862 | 503 | while (entry != NULL) { |
tschatzl@5862 | 504 | if (is_alive->do_object_b(entry->literal())) { |
tschatzl@5862 | 505 | p = entry->next_addr(); |
tschatzl@5862 | 506 | } else { |
tschatzl@5862 | 507 | *p = entry->next(); |
tschatzl@5862 | 508 | free_entry(entry); |
tschatzl@5862 | 509 | } |
tschatzl@5862 | 510 | entry = *p; |
tschatzl@5862 | 511 | } |
tschatzl@5862 | 512 | } |
tschatzl@5862 | 513 | } |
tschatzl@5862 | 514 | |
tschatzl@5862 | 515 | void ProtectionDomainCacheTable::oops_do(OopClosure* f) { |
tschatzl@5862 | 516 | for (int index = 0; index < table_size(); index++) { |
tschatzl@5862 | 517 | for (ProtectionDomainCacheEntry* probe = bucket(index); |
tschatzl@5862 | 518 | probe != NULL; |
tschatzl@5862 | 519 | probe = probe->next()) { |
tschatzl@5862 | 520 | probe->oops_do(f); |
tschatzl@5862 | 521 | } |
tschatzl@5862 | 522 | } |
tschatzl@5862 | 523 | } |
tschatzl@5862 | 524 | |
stefank@6992 | 525 | void ProtectionDomainCacheTable::roots_oops_do(OopClosure* strong, OopClosure* weak) { |
stefank@6992 | 526 | for (int index = 0; index < table_size(); index++) { |
stefank@6992 | 527 | for (ProtectionDomainCacheEntry* probe = bucket(index); |
stefank@6992 | 528 | probe != NULL; |
stefank@6992 | 529 | probe = probe->next()) { |
stefank@6992 | 530 | if (probe->is_strongly_reachable()) { |
stefank@6992 | 531 | probe->reset_strongly_reachable(); |
stefank@6992 | 532 | probe->oops_do(strong); |
stefank@6992 | 533 | } else { |
stefank@6992 | 534 | if (weak != NULL) { |
stefank@6992 | 535 | probe->oops_do(weak); |
stefank@6992 | 536 | } |
stefank@6992 | 537 | } |
stefank@6992 | 538 | } |
stefank@6992 | 539 | } |
stefank@6992 | 540 | } |
stefank@6992 | 541 | |
tschatzl@5862 | 542 | uint ProtectionDomainCacheTable::bucket_size() { |
tschatzl@5862 | 543 | return sizeof(ProtectionDomainCacheEntry); |
tschatzl@5862 | 544 | } |
tschatzl@5862 | 545 | |
tschatzl@5862 | 546 | #ifndef PRODUCT |
tschatzl@5862 | 547 | void ProtectionDomainCacheTable::print() { |
tschatzl@5862 | 548 | tty->print_cr("Protection domain cache table (table_size=%d, classes=%d)", |
tschatzl@5862 | 549 | table_size(), number_of_entries()); |
tschatzl@5862 | 550 | for (int index = 0; index < table_size(); index++) { |
tschatzl@5862 | 551 | for (ProtectionDomainCacheEntry* probe = bucket(index); |
tschatzl@5862 | 552 | probe != NULL; |
tschatzl@5862 | 553 | probe = probe->next()) { |
tschatzl@5862 | 554 | probe->print(); |
tschatzl@5862 | 555 | } |
tschatzl@5862 | 556 | } |
tschatzl@5862 | 557 | } |
tschatzl@5862 | 558 | |
tschatzl@5862 | 559 | void ProtectionDomainCacheEntry::print() { |
tschatzl@5862 | 560 | tty->print_cr("entry "PTR_FORMAT" value "PTR_FORMAT" strongly_reachable %d next "PTR_FORMAT, |
jcoomes@5865 | 561 | this, (void*)literal(), _strongly_reachable, next()); |
tschatzl@5862 | 562 | } |
tschatzl@5862 | 563 | #endif |
tschatzl@5862 | 564 | |
tschatzl@5862 | 565 | void ProtectionDomainCacheTable::verify() { |
tschatzl@5862 | 566 | int element_count = 0; |
tschatzl@5862 | 567 | for (int index = 0; index < table_size(); index++) { |
tschatzl@5862 | 568 | for (ProtectionDomainCacheEntry* probe = bucket(index); |
tschatzl@5862 | 569 | probe != NULL; |
tschatzl@5862 | 570 | probe = probe->next()) { |
tschatzl@5862 | 571 | probe->verify(); |
tschatzl@5862 | 572 | element_count++; |
tschatzl@5862 | 573 | } |
tschatzl@5862 | 574 | } |
tschatzl@5862 | 575 | guarantee(number_of_entries() == element_count, |
tschatzl@5862 | 576 | "Verify of protection domain cache table failed"); |
tschatzl@5862 | 577 | debug_only(verify_lookup_length((double)number_of_entries() / table_size())); |
tschatzl@5862 | 578 | } |
tschatzl@5862 | 579 | |
tschatzl@5862 | 580 | void ProtectionDomainCacheEntry::verify() { |
tschatzl@5862 | 581 | guarantee(literal()->is_oop(), "must be an oop"); |
tschatzl@5862 | 582 | } |
tschatzl@5862 | 583 | |
tschatzl@5862 | 584 | void ProtectionDomainCacheTable::always_strong_oops_do(OopClosure* f) { |
tschatzl@5862 | 585 | // the caller marked the protection domain cache entries that we need to apply |
tschatzl@5862 | 586 | // the closure on. Only process them. |
tschatzl@5862 | 587 | for (int index = 0; index < table_size(); index++) { |
tschatzl@5862 | 588 | for (ProtectionDomainCacheEntry* probe = bucket(index); |
tschatzl@5862 | 589 | probe != NULL; |
tschatzl@5862 | 590 | probe = probe->next()) { |
tschatzl@5862 | 591 | if (probe->is_strongly_reachable()) { |
tschatzl@5862 | 592 | probe->reset_strongly_reachable(); |
tschatzl@5862 | 593 | probe->oops_do(f); |
tschatzl@5862 | 594 | } |
tschatzl@5862 | 595 | } |
tschatzl@5862 | 596 | } |
tschatzl@5862 | 597 | } |
tschatzl@5862 | 598 | |
tschatzl@5862 | 599 | ProtectionDomainCacheEntry* ProtectionDomainCacheTable::get(oop protection_domain) { |
tschatzl@5862 | 600 | unsigned int hash = compute_hash(protection_domain); |
tschatzl@5862 | 601 | int index = hash_to_index(hash); |
tschatzl@5862 | 602 | |
tschatzl@5862 | 603 | ProtectionDomainCacheEntry* entry = find_entry(index, protection_domain); |
tschatzl@5862 | 604 | if (entry == NULL) { |
tschatzl@5862 | 605 | entry = add_entry(index, hash, protection_domain); |
tschatzl@5862 | 606 | } |
tschatzl@5862 | 607 | return entry; |
tschatzl@5862 | 608 | } |
tschatzl@5862 | 609 | |
tschatzl@5862 | 610 | ProtectionDomainCacheEntry* ProtectionDomainCacheTable::find_entry(int index, oop protection_domain) { |
tschatzl@5862 | 611 | for (ProtectionDomainCacheEntry* e = bucket(index); e != NULL; e = e->next()) { |
tschatzl@5862 | 612 | if (e->protection_domain() == protection_domain) { |
tschatzl@5862 | 613 | return e; |
tschatzl@5862 | 614 | } |
tschatzl@5862 | 615 | } |
tschatzl@5862 | 616 | |
tschatzl@5862 | 617 | return NULL; |
tschatzl@5862 | 618 | } |
tschatzl@5862 | 619 | |
tschatzl@5862 | 620 | ProtectionDomainCacheEntry* ProtectionDomainCacheTable::add_entry(int index, unsigned int hash, oop protection_domain) { |
tschatzl@5862 | 621 | assert_locked_or_safepoint(SystemDictionary_lock); |
tschatzl@5862 | 622 | assert(index == index_for(protection_domain), "incorrect index?"); |
tschatzl@5862 | 623 | assert(find_entry(index, protection_domain) == NULL, "no double entry"); |
tschatzl@5862 | 624 | |
tschatzl@5862 | 625 | ProtectionDomainCacheEntry* p = new_entry(hash, protection_domain); |
tschatzl@5862 | 626 | Hashtable<oop, mtClass>::add_entry(index, p); |
tschatzl@5862 | 627 | return p; |
tschatzl@5862 | 628 | } |
tschatzl@5862 | 629 | |
tschatzl@5862 | 630 | void ProtectionDomainCacheTable::free(ProtectionDomainCacheEntry* to_delete) { |
tschatzl@5862 | 631 | unsigned int hash = compute_hash(to_delete->protection_domain()); |
tschatzl@5862 | 632 | int index = hash_to_index(hash); |
tschatzl@5862 | 633 | |
tschatzl@5862 | 634 | ProtectionDomainCacheEntry** p = bucket_addr(index); |
tschatzl@5862 | 635 | ProtectionDomainCacheEntry* entry = bucket(index); |
tschatzl@5862 | 636 | while (true) { |
tschatzl@5862 | 637 | assert(entry != NULL, "sanity"); |
tschatzl@5862 | 638 | |
tschatzl@5862 | 639 | if (entry == to_delete) { |
tschatzl@5862 | 640 | *p = entry->next(); |
tschatzl@5862 | 641 | Hashtable<oop, mtClass>::free_entry(entry); |
tschatzl@5862 | 642 | break; |
tschatzl@5862 | 643 | } else { |
tschatzl@5862 | 644 | p = entry->next_addr(); |
tschatzl@5862 | 645 | entry = *p; |
tschatzl@5862 | 646 | } |
tschatzl@5862 | 647 | } |
tschatzl@5862 | 648 | } |
tschatzl@5862 | 649 | |
jrose@1145 | 650 | SymbolPropertyTable::SymbolPropertyTable(int table_size) |
zgu@3900 | 651 | : Hashtable<Symbol*, mtSymbol>(table_size, sizeof(SymbolPropertyEntry)) |
jrose@1145 | 652 | { |
jrose@1145 | 653 | } |
zgu@3900 | 654 | SymbolPropertyTable::SymbolPropertyTable(int table_size, HashtableBucket<mtSymbol>* t, |
jrose@1145 | 655 | int number_of_entries) |
zgu@3900 | 656 | : Hashtable<Symbol*, mtSymbol>(table_size, sizeof(SymbolPropertyEntry), t, number_of_entries) |
jrose@1145 | 657 | { |
jrose@1145 | 658 | } |
jrose@1145 | 659 | |
jrose@1145 | 660 | |
jrose@1145 | 661 | SymbolPropertyEntry* SymbolPropertyTable::find_entry(int index, unsigned int hash, |
coleenp@2497 | 662 | Symbol* sym, |
jrose@1862 | 663 | intptr_t sym_mode) { |
jrose@1862 | 664 | assert(index == index_for(sym, sym_mode), "incorrect index?"); |
jrose@1145 | 665 | for (SymbolPropertyEntry* p = bucket(index); p != NULL; p = p->next()) { |
coleenp@2497 | 666 | if (p->hash() == hash && p->symbol() == sym && p->symbol_mode() == sym_mode) { |
jrose@1145 | 667 | return p; |
jrose@1145 | 668 | } |
jrose@1145 | 669 | } |
jrose@1145 | 670 | return NULL; |
jrose@1145 | 671 | } |
jrose@1145 | 672 | |
jrose@1145 | 673 | |
jrose@1145 | 674 | SymbolPropertyEntry* SymbolPropertyTable::add_entry(int index, unsigned int hash, |
coleenp@2497 | 675 | Symbol* sym, intptr_t sym_mode) { |
jrose@1145 | 676 | assert_locked_or_safepoint(SystemDictionary_lock); |
jrose@1862 | 677 | assert(index == index_for(sym, sym_mode), "incorrect index?"); |
jrose@1862 | 678 | assert(find_entry(index, hash, sym, sym_mode) == NULL, "no double entry"); |
jrose@1145 | 679 | |
coleenp@2497 | 680 | SymbolPropertyEntry* p = new_entry(hash, sym, sym_mode); |
zgu@3900 | 681 | Hashtable<Symbol*, mtSymbol>::add_entry(index, p); |
jrose@1145 | 682 | return p; |
jrose@1145 | 683 | } |
jrose@1145 | 684 | |
jrose@1145 | 685 | void SymbolPropertyTable::oops_do(OopClosure* f) { |
jrose@1145 | 686 | for (int index = 0; index < table_size(); index++) { |
jrose@1145 | 687 | for (SymbolPropertyEntry* p = bucket(index); p != NULL; p = p->next()) { |
coleenp@4037 | 688 | if (p->method_type() != NULL) { |
coleenp@4037 | 689 | f->do_oop(p->method_type_addr()); |
jrose@1145 | 690 | } |
jrose@1145 | 691 | } |
jrose@1145 | 692 | } |
jrose@1145 | 693 | } |
jrose@1145 | 694 | |
coleenp@4037 | 695 | void SymbolPropertyTable::methods_do(void f(Method*)) { |
jrose@1145 | 696 | for (int index = 0; index < table_size(); index++) { |
jrose@1145 | 697 | for (SymbolPropertyEntry* p = bucket(index); p != NULL; p = p->next()) { |
coleenp@4037 | 698 | Method* prop = p->method(); |
coleenp@4037 | 699 | if (prop != NULL) { |
coleenp@4037 | 700 | f((Method*)prop); |
jrose@1145 | 701 | } |
jrose@1145 | 702 | } |
jrose@1145 | 703 | } |
jrose@1145 | 704 | } |
jrose@1145 | 705 | |
duke@435 | 706 | |
duke@435 | 707 | // ---------------------------------------------------------------------------- |
duke@435 | 708 | |
iklam@7089 | 709 | void Dictionary::print(bool details) { |
duke@435 | 710 | ResourceMark rm; |
duke@435 | 711 | HandleMark hm; |
duke@435 | 712 | |
iklam@7089 | 713 | if (details) { |
iklam@7089 | 714 | tty->print_cr("Java system dictionary (table_size=%d, classes=%d)", |
iklam@7089 | 715 | table_size(), number_of_entries()); |
iklam@7089 | 716 | tty->print_cr("^ indicates that initiating loader is different from " |
iklam@7089 | 717 | "defining loader"); |
iklam@7089 | 718 | } |
duke@435 | 719 | |
duke@435 | 720 | for (int index = 0; index < table_size(); index++) { |
duke@435 | 721 | for (DictionaryEntry* probe = bucket(index); |
duke@435 | 722 | probe != NULL; |
duke@435 | 723 | probe = probe->next()) { |
duke@435 | 724 | if (Verbose) tty->print("%4d: ", index); |
coleenp@4037 | 725 | Klass* e = probe->klass(); |
coleenp@4037 | 726 | ClassLoaderData* loader_data = probe->loader_data(); |
duke@435 | 727 | bool is_defining_class = |
coleenp@4037 | 728 | (loader_data == InstanceKlass::cast(e)->class_loader_data()); |
iklam@7089 | 729 | tty->print("%s%s", ((!details) || is_defining_class) ? " " : "^", |
hseigel@4278 | 730 | e->external_name()); |
coleenp@4037 | 731 | |
iklam@7089 | 732 | if (details) { |
duke@435 | 733 | tty->print(", loader "); |
iklam@7089 | 734 | if (loader_data != NULL) { |
iklam@7089 | 735 | loader_data->print_value(); |
iklam@7089 | 736 | } else { |
iklam@7089 | 737 | tty->print("NULL"); |
iklam@7089 | 738 | } |
iklam@7089 | 739 | } |
duke@435 | 740 | tty->cr(); |
duke@435 | 741 | } |
duke@435 | 742 | } |
iklam@7089 | 743 | |
iklam@7089 | 744 | if (details) { |
iklam@7089 | 745 | tty->cr(); |
iklam@7089 | 746 | _pd_cache_table->print(); |
iklam@7089 | 747 | } |
tschatzl@5862 | 748 | tty->cr(); |
duke@435 | 749 | } |
duke@435 | 750 | |
duke@435 | 751 | void Dictionary::verify() { |
duke@435 | 752 | guarantee(number_of_entries() >= 0, "Verify of system dictionary failed"); |
coleenp@4037 | 753 | |
duke@435 | 754 | int element_count = 0; |
duke@435 | 755 | for (int index = 0; index < table_size(); index++) { |
duke@435 | 756 | for (DictionaryEntry* probe = bucket(index); |
duke@435 | 757 | probe != NULL; |
duke@435 | 758 | probe = probe->next()) { |
coleenp@4037 | 759 | Klass* e = probe->klass(); |
coleenp@4037 | 760 | ClassLoaderData* loader_data = probe->loader_data(); |
hseigel@4278 | 761 | guarantee(e->oop_is_instance(), |
duke@435 | 762 | "Verify of system dictionary failed"); |
duke@435 | 763 | // class loader must be present; a null class loader is the |
duke@435 | 764 | // boostrap loader |
coleenp@4037 | 765 | guarantee(loader_data != NULL || DumpSharedSpaces || |
coleenp@4304 | 766 | loader_data->class_loader() == NULL || |
coleenp@4037 | 767 | loader_data->class_loader()->is_instance(), |
duke@435 | 768 | "checking type of class_loader"); |
coleenp@6316 | 769 | e->verify(); |
duke@435 | 770 | probe->verify_protection_domain_set(); |
duke@435 | 771 | element_count++; |
duke@435 | 772 | } |
duke@435 | 773 | } |
duke@435 | 774 | guarantee(number_of_entries() == element_count, |
duke@435 | 775 | "Verify of system dictionary failed"); |
duke@435 | 776 | debug_only(verify_lookup_length((double)number_of_entries() / table_size())); |
tschatzl@5862 | 777 | |
tschatzl@5862 | 778 | _pd_cache_table->verify(); |
duke@435 | 779 | } |
coleenp@4037 | 780 |