Mercurial > hg > truffle
annotate src/share/vm/classfile/placeholders.hpp @ 2426:1d1603768966
7010070: Update all 2010 Oracle-changed OpenJDK files to have the proper copyright dates - second pass
Summary: Update the copyright to be 2010 on all changed files in OpenJDK
Reviewed-by: ohair
| author | trims |
|---|---|
| date | Tue, 05 Apr 2011 14:12:31 -0700 |
| parents | 3582bf76420e |
| children | d2a62e0f25eb |
| rev | line source |
|---|---|
| 0 | 1 /* |
|
2426
1d1603768966
7010070: Update all 2010 Oracle-changed OpenJDK files to have the proper copyright dates - second pass
trims
parents:
2177
diff
changeset
|
2 * Copyright (c) 2003, 2011, 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 * | |
|
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_CLASSFILE_PLACEHOLDERS_HPP |
| 26 #define SHARE_VM_CLASSFILE_PLACEHOLDERS_HPP | |
| 27 | |
|
1983
c760f78e0a53
7003125: precompiled.hpp is included when precompiled headers are not used
stefank
parents:
1972
diff
changeset
|
28 #include "runtime/thread.hpp" |
| 1972 | 29 #include "utilities/hashtable.hpp" |
| 30 | |
| 0 | 31 class PlaceholderEntry; |
| 32 | |
| 33 // Placeholder objects. These represent classes currently | |
| 34 // being loaded, as well as arrays of primitives. | |
| 35 // | |
| 36 | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1983
diff
changeset
|
37 class PlaceholderTable : public TwoOopHashtable<Symbol*> { |
| 0 | 38 friend class VMStructs; |
| 39 | |
| 40 public: | |
| 41 PlaceholderTable(int table_size); | |
| 42 | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1983
diff
changeset
|
43 PlaceholderEntry* new_entry(int hash, Symbol* name, oop loader, bool havesupername, Symbol* supername); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1983
diff
changeset
|
44 void free_entry(PlaceholderEntry* entry); |
| 0 | 45 |
| 46 PlaceholderEntry* bucket(int i) { | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1983
diff
changeset
|
47 return (PlaceholderEntry*)Hashtable<Symbol*>::bucket(i); |
| 0 | 48 } |
| 49 | |
| 50 PlaceholderEntry** bucket_addr(int i) { | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1983
diff
changeset
|
51 return (PlaceholderEntry**)Hashtable<Symbol*>::bucket_addr(i); |
| 0 | 52 } |
| 53 | |
| 54 void add_entry(int index, PlaceholderEntry* new_entry) { | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1983
diff
changeset
|
55 Hashtable<Symbol*>::add_entry(index, (HashtableEntry<Symbol*>*)new_entry); |
| 0 | 56 } |
| 57 | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1983
diff
changeset
|
58 void add_entry(int index, unsigned int hash, Symbol* name, |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1983
diff
changeset
|
59 Handle loader, bool havesupername, Symbol* supername); |
| 0 | 60 |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1983
diff
changeset
|
61 // This returns a Symbol* to match type for SystemDictionary |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1983
diff
changeset
|
62 Symbol* find_entry(int index, unsigned int hash, |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1983
diff
changeset
|
63 Symbol* name, Handle loader); |
| 0 | 64 |
| 65 PlaceholderEntry* get_entry(int index, unsigned int hash, | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1983
diff
changeset
|
66 Symbol* name, Handle loader); |
| 0 | 67 |
| 68 // caller to create a placeholder entry must enumerate an action | |
| 69 // caller claims ownership of that action | |
| 70 // For parallel classloading: | |
| 71 // multiple LOAD_INSTANCE threads can proceed in parallel | |
| 72 // multiple LOAD_SUPER threads can proceed in parallel | |
| 73 // LOAD_SUPER needed to check for class circularity | |
| 74 // DEFINE_CLASS: ultimately define class must be single threaded | |
| 75 // on a class/classloader basis | |
| 76 // so the head of that queue owns the token | |
| 77 // and the rest of the threads return the result the first thread gets | |
| 78 enum classloadAction { | |
| 79 LOAD_INSTANCE = 1, // calling load_instance_class | |
| 80 LOAD_SUPER = 2, // loading superclass for this class | |
| 81 DEFINE_CLASS = 3 // find_or_define class | |
| 82 }; | |
| 83 | |
| 84 // find_and_add returns probe pointer - old or new | |
| 85 // If no entry exists, add a placeholder entry and push SeenThread | |
| 86 // If entry exists, reuse entry and push SeenThread for classloadAction | |
| 87 PlaceholderEntry* find_and_add(int index, unsigned int hash, | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1983
diff
changeset
|
88 Symbol* name, Handle loader, |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1983
diff
changeset
|
89 classloadAction action, Symbol* supername, |
| 0 | 90 Thread* thread); |
| 91 | |
| 92 void remove_entry(int index, unsigned int hash, | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1983
diff
changeset
|
93 Symbol* name, Handle loader); |
| 0 | 94 |
| 95 // Remove placeholder information | |
| 96 void find_and_remove(int index, unsigned int hash, | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1983
diff
changeset
|
97 Symbol* name, Handle loader, Thread* thread); |
| 0 | 98 |
| 99 // GC support. | |
| 100 void oops_do(OopClosure* f); | |
| 101 | |
| 102 // JVMTI support | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1983
diff
changeset
|
103 void entries_do(void f(Symbol*, oop)); |
| 0 | 104 |
| 105 #ifndef PRODUCT | |
| 106 void print(); | |
| 107 #endif | |
| 108 void verify(); | |
| 109 }; | |
| 110 | |
| 111 // SeenThread objects represent list of threads that are | |
| 112 // currently performing a load action on a class. | |
| 113 // For class circularity, set before loading a superclass. | |
| 114 // For bootclasssearchpath, set before calling load_instance_class. | |
| 115 // Defining must be single threaded on a class/classloader basis | |
| 116 // For DEFINE_CLASS, the head of the queue owns the | |
| 117 // define token and the rest of the threads wait to return the | |
| 118 // result the first thread gets. | |
| 119 class SeenThread: public CHeapObj { | |
| 120 private: | |
| 121 Thread *_thread; | |
| 122 SeenThread* _stnext; | |
| 123 SeenThread* _stprev; | |
| 124 public: | |
| 125 SeenThread(Thread *thread) { | |
| 126 _thread = thread; | |
| 127 _stnext = NULL; | |
| 128 _stprev = NULL; | |
| 129 } | |
| 130 Thread* thread() const { return _thread;} | |
| 131 void set_thread(Thread *thread) { _thread = thread; } | |
| 132 | |
| 133 SeenThread* next() const { return _stnext;} | |
| 134 void set_next(SeenThread *seen) { _stnext = seen; } | |
| 135 void set_prev(SeenThread *seen) { _stprev = seen; } | |
| 136 | |
| 137 #ifndef PRODUCT | |
| 138 void printActionQ() { | |
| 139 SeenThread* seen = this; | |
| 140 while (seen != NULL) { | |
| 141 seen->thread()->print_value(); | |
| 142 tty->print(", "); | |
| 143 seen = seen->next(); | |
| 144 } | |
| 145 } | |
| 146 #endif // PRODUCT | |
| 147 }; | |
| 148 | |
| 149 // Placeholder objects represent classes currently being loaded. | |
| 150 // All threads examining the placeholder table must hold the | |
| 151 // SystemDictionary_lock, so we don't need special precautions | |
| 152 // on store ordering here. | |
| 153 // The system dictionary is the only user of this class. | |
| 154 | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1983
diff
changeset
|
155 class PlaceholderEntry : public HashtableEntry<Symbol*> { |
| 0 | 156 friend class VMStructs; |
| 157 | |
| 158 | |
| 159 private: | |
| 160 oop _loader; // initiating loader | |
| 161 bool _havesupername; // distinguish between null supername, and unknown | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1983
diff
changeset
|
162 Symbol* _supername; |
| 0 | 163 Thread* _definer; // owner of define token |
| 164 klassOop _instanceKlass; // instanceKlass from successful define | |
| 165 SeenThread* _superThreadQ; // doubly-linked queue of Threads loading a superclass for this class | |
| 166 SeenThread* _loadInstanceThreadQ; // loadInstance thread | |
| 167 // can be multiple threads if classloader object lock broken by application | |
| 168 // or if classloader supports parallel classloading | |
| 169 | |
| 170 SeenThread* _defineThreadQ; // queue of Threads trying to define this class | |
| 171 // including _definer | |
| 172 // _definer owns token | |
| 173 // queue waits for and returns results from _definer | |
| 174 | |
| 175 public: | |
| 176 // Simple accessors, used only by SystemDictionary | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1983
diff
changeset
|
177 Symbol* klassname() const { return literal(); } |
| 0 | 178 |
| 179 oop loader() const { return _loader; } | |
| 180 void set_loader(oop loader) { _loader = loader; } | |
| 181 oop* loader_addr() { return &_loader; } | |
| 182 | |
| 183 bool havesupername() const { return _havesupername; } | |
| 184 void set_havesupername(bool havesupername) { _havesupername = havesupername; } | |
| 185 | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1983
diff
changeset
|
186 Symbol* supername() const { return _supername; } |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1983
diff
changeset
|
187 void set_supername(Symbol* supername) { |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1983
diff
changeset
|
188 _supername = supername; |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1983
diff
changeset
|
189 if (_supername != NULL) _supername->increment_refcount(); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1983
diff
changeset
|
190 } |
| 0 | 191 |
| 192 Thread* definer() const {return _definer; } | |
| 193 void set_definer(Thread* definer) { _definer = definer; } | |
| 194 | |
| 195 klassOop instanceKlass() const {return _instanceKlass; } | |
| 196 void set_instanceKlass(klassOop instanceKlass) { _instanceKlass = instanceKlass; } | |
| 197 klassOop* instanceKlass_addr() { return &_instanceKlass; } | |
| 198 | |
| 199 SeenThread* superThreadQ() const { return _superThreadQ; } | |
| 200 void set_superThreadQ(SeenThread* SeenThread) { _superThreadQ = SeenThread; } | |
| 201 | |
| 202 SeenThread* loadInstanceThreadQ() const { return _loadInstanceThreadQ; } | |
| 203 void set_loadInstanceThreadQ(SeenThread* SeenThread) { _loadInstanceThreadQ = SeenThread; } | |
| 204 | |
| 205 SeenThread* defineThreadQ() const { return _defineThreadQ; } | |
| 206 void set_defineThreadQ(SeenThread* SeenThread) { _defineThreadQ = SeenThread; } | |
| 207 | |
| 208 PlaceholderEntry* next() const { | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1983
diff
changeset
|
209 return (PlaceholderEntry*)HashtableEntry<Symbol*>::next(); |
| 0 | 210 } |
| 211 | |
| 212 PlaceholderEntry** next_addr() { | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1983
diff
changeset
|
213 return (PlaceholderEntry**)HashtableEntry<Symbol*>::next_addr(); |
| 0 | 214 } |
| 215 | |
| 216 // Test for equality | |
| 217 // Entries are unique for class/classloader name pair | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1983
diff
changeset
|
218 bool equals(Symbol* class_name, oop class_loader) const { |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1983
diff
changeset
|
219 return (klassname() == class_name && loader() == class_loader); |
| 0 | 220 } |
| 221 | |
| 222 SeenThread* actionToQueue(PlaceholderTable::classloadAction action) { | |
| 223 SeenThread* queuehead; | |
| 224 switch (action) { | |
| 225 case PlaceholderTable::LOAD_INSTANCE: | |
| 226 queuehead = _loadInstanceThreadQ; | |
| 227 break; | |
| 228 case PlaceholderTable::LOAD_SUPER: | |
| 229 queuehead = _superThreadQ; | |
| 230 break; | |
| 231 case PlaceholderTable::DEFINE_CLASS: | |
| 232 queuehead = _defineThreadQ; | |
| 233 break; | |
| 234 default: Unimplemented(); | |
| 235 } | |
| 236 return queuehead; | |
| 237 } | |
| 238 | |
| 239 void set_threadQ(SeenThread* seenthread, PlaceholderTable::classloadAction action) { | |
| 240 switch (action) { | |
| 241 case PlaceholderTable::LOAD_INSTANCE: | |
| 242 _loadInstanceThreadQ = seenthread; | |
| 243 break; | |
| 244 case PlaceholderTable::LOAD_SUPER: | |
| 245 _superThreadQ = seenthread; | |
| 246 break; | |
| 247 case PlaceholderTable::DEFINE_CLASS: | |
| 248 _defineThreadQ = seenthread; | |
| 249 break; | |
| 250 default: Unimplemented(); | |
| 251 } | |
| 252 return; | |
| 253 } | |
| 254 | |
| 255 bool super_load_in_progress() { | |
| 256 return (_superThreadQ != NULL); | |
| 257 } | |
| 258 | |
| 259 bool instance_load_in_progress() { | |
| 260 return (_loadInstanceThreadQ != NULL); | |
| 261 } | |
| 262 | |
| 263 bool define_class_in_progress() { | |
| 264 return (_defineThreadQ != NULL); | |
| 265 } | |
| 266 | |
| 267 // Doubly-linked list of Threads per action for class/classloader pair | |
| 268 // Class circularity support: links in thread before loading superclass | |
| 269 // bootstrapsearchpath support: links in a thread before load_instance_class | |
| 270 // definers: use as queue of define requestors, including owner of | |
| 271 // define token. Appends for debugging of requestor order | |
| 272 void add_seen_thread(Thread* thread, PlaceholderTable::classloadAction action) { | |
| 273 assert_lock_strong(SystemDictionary_lock); | |
| 274 SeenThread* threadEntry = new SeenThread(thread); | |
| 275 SeenThread* seen = actionToQueue(action); | |
| 276 | |
| 277 if (seen == NULL) { | |
| 278 set_threadQ(threadEntry, action); | |
| 279 return; | |
| 280 } | |
| 281 SeenThread* next; | |
| 282 while ((next = seen->next()) != NULL) { | |
| 283 seen = next; | |
| 284 } | |
| 285 seen->set_next(threadEntry); | |
| 286 threadEntry->set_prev(seen); | |
| 287 return; | |
| 288 } | |
| 289 | |
| 290 bool check_seen_thread(Thread* thread, PlaceholderTable::classloadAction action) { | |
| 291 assert_lock_strong(SystemDictionary_lock); | |
| 292 SeenThread* threadQ = actionToQueue(action); | |
| 293 SeenThread* seen = threadQ; | |
| 294 while (seen) { | |
| 295 if (thread == seen->thread()) { | |
| 296 return true; | |
| 297 } | |
| 298 seen = seen->next(); | |
| 299 } | |
| 300 return false; | |
| 301 } | |
| 302 | |
| 303 // returns true if seenthreadQ is now empty | |
| 304 // Note, caller must ensure probe still exists while holding | |
| 305 // SystemDictionary_lock | |
| 306 // ignores if cleanup has already been done | |
| 307 // if found, deletes SeenThread | |
| 308 bool remove_seen_thread(Thread* thread, PlaceholderTable::classloadAction action) { | |
| 309 assert_lock_strong(SystemDictionary_lock); | |
| 310 SeenThread* threadQ = actionToQueue(action); | |
| 311 SeenThread* seen = threadQ; | |
| 312 SeenThread* prev = NULL; | |
| 313 while (seen) { | |
| 314 if (thread == seen->thread()) { | |
| 315 if (prev) { | |
| 316 prev->set_next(seen->next()); | |
| 317 } else { | |
| 318 set_threadQ(seen->next(), action); | |
| 319 } | |
| 320 if (seen->next()) { | |
| 321 seen->next()->set_prev(prev); | |
| 322 } | |
| 323 delete seen; | |
| 324 break; | |
| 325 } | |
| 326 prev = seen; | |
| 327 seen = seen->next(); | |
| 328 } | |
| 329 return (actionToQueue(action) == NULL); | |
| 330 } | |
| 331 | |
| 332 // GC support | |
| 333 // Applies "f->do_oop" to all root oops in the placeholder table. | |
| 334 void oops_do(OopClosure* blk); | |
| 335 | |
| 336 // Print method doesn't append a cr | |
| 337 void print() const PRODUCT_RETURN; | |
| 338 void verify() const; | |
| 339 }; | |
| 1972 | 340 |
| 341 #endif // SHARE_VM_CLASSFILE_PLACEHOLDERS_HPP |