Mercurial > hg > truffle
annotate src/share/vm/classfile/dictionary.hpp @ 20278:2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov
Contributed-by: stefan.karlsson@oracle.com, mikael.gerdin@oracle.com
| author | stefank |
|---|---|
| date | Mon, 07 Jul 2014 10:12:40 +0200 |
| parents | 78bbf4d43a14 |
| children | c3990b8c710e |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2003, 2014, 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 #ifndef SHARE_VM_CLASSFILE_DICTIONARY_HPP |
| 26 #define SHARE_VM_CLASSFILE_DICTIONARY_HPP | |
| 27 | |
| 28 #include "classfile/systemDictionary.hpp" | |
| 29 #include "oops/instanceKlass.hpp" | |
| 12837 | 30 #include "oops/oop.inline.hpp" |
| 1972 | 31 #include "utilities/hashtable.hpp" |
| 32 | |
| 0 | 33 class DictionaryEntry; |
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34 class PSPromotionManager; |
| 12837 | 35 class ProtectionDomainCacheTable; |
| 36 class ProtectionDomainCacheEntry; | |
| 37 class BoolObjectClosure; | |
| 0 | 38 |
| 39 //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
| 40 // The data structure for the system dictionary (and the shared system | |
| 41 // dictionary). | |
| 42 | |
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43 class Dictionary : public TwoOopHashtable<Klass*, mtClass> { |
| 0 | 44 friend class VMStructs; |
| 45 private: | |
| 46 // current iteration index. | |
| 47 static int _current_class_index; | |
| 48 // pointer to the current hash table entry. | |
| 49 static DictionaryEntry* _current_class_entry; | |
| 50 | |
| 12837 | 51 ProtectionDomainCacheTable* _pd_cache_table; |
| 52 | |
| 0 | 53 DictionaryEntry* get_entry(int index, unsigned int hash, |
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54 Symbol* name, ClassLoaderData* loader_data); |
| 0 | 55 |
| 56 DictionaryEntry* bucket(int i) { | |
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57 return (DictionaryEntry*)Hashtable<Klass*, mtClass>::bucket(i); |
| 0 | 58 } |
| 59 | |
| 60 // The following method is not MT-safe and must be done under lock. | |
| 61 DictionaryEntry** bucket_addr(int i) { | |
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62 return (DictionaryEntry**)Hashtable<Klass*, mtClass>::bucket_addr(i); |
| 0 | 63 } |
| 64 | |
| 65 void add_entry(int index, DictionaryEntry* new_entry) { | |
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66 Hashtable<Klass*, mtClass>::add_entry(index, (HashtableEntry<Klass*, mtClass>*)new_entry); |
| 0 | 67 } |
| 68 | |
| 69 public: | |
| 70 Dictionary(int table_size); | |
| 6197 | 71 Dictionary(int table_size, HashtableBucket<mtClass>* t, int number_of_entries); |
| 0 | 72 |
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73 DictionaryEntry* new_entry(unsigned int hash, Klass* klass, ClassLoaderData* loader_data); |
| 0 | 74 |
| 75 DictionaryEntry* new_entry(); | |
| 76 | |
| 77 void free_entry(DictionaryEntry* entry); | |
| 78 | |
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79 void add_klass(Symbol* class_name, ClassLoaderData* loader_data,KlassHandle obj); |
| 0 | 80 |
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81 Klass* find_class(int index, unsigned int hash, |
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82 Symbol* name, ClassLoaderData* loader_data); |
| 0 | 83 |
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84 Klass* find_shared_class(int index, unsigned int hash, Symbol* name); |
| 0 | 85 |
| 86 // Compiler support | |
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87 Klass* try_get_next_class(); |
| 0 | 88 |
| 89 // GC support | |
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90 void oops_do(OopClosure* f); |
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91 void always_strong_oops_do(OopClosure* blk); |
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92 void roots_oops_do(OopClosure* strong, OopClosure* weak); |
| 0 | 93 |
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94 void always_strong_classes_do(KlassClosure* closure); |
| 0 | 95 |
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96 void classes_do(void f(Klass*)); |
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97 void classes_do(void f(Klass*, TRAPS), TRAPS); |
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98 void classes_do(void f(Klass*, ClassLoaderData*)); |
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99 |
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100 void methods_do(void f(Method*)); |
| 0 | 101 |
| 12837 | 102 void unlink(BoolObjectClosure* is_alive); |
| 0 | 103 |
| 104 // Classes loaded by the bootstrap loader are always strongly reachable. | |
| 105 // If we're not doing class unloading, all classes are strongly reachable. | |
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106 static bool is_strongly_reachable(ClassLoaderData* loader_data, Klass* klass) { |
| 0 | 107 assert (klass != NULL, "should have non-null klass"); |
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108 return (loader_data->is_the_null_class_loader_data() || !ClassUnloading); |
| 0 | 109 } |
| 110 | |
| 111 // Unload (that is, break root links to) all unmarked classes and | |
| 112 // loaders. Returns "true" iff something was unloaded. | |
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113 bool do_unloading(); |
| 0 | 114 |
| 115 // Protection domains | |
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116 Klass* find(int index, unsigned int hash, Symbol* name, |
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117 ClassLoaderData* loader_data, Handle protection_domain, TRAPS); |
| 0 | 118 bool is_valid_protection_domain(int index, unsigned int hash, |
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119 Symbol* name, ClassLoaderData* loader_data, |
| 0 | 120 Handle protection_domain); |
| 121 void add_protection_domain(int index, unsigned int hash, | |
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122 instanceKlassHandle klass, ClassLoaderData* loader_data, |
| 0 | 123 Handle protection_domain, TRAPS); |
| 124 | |
| 125 // Sharing support | |
| 126 void reorder_dictionary(); | |
| 127 | |
| 12837 | 128 ProtectionDomainCacheEntry* cache_get(oop protection_domain); |
| 0 | 129 |
| 130 #ifndef PRODUCT | |
| 131 void print(); | |
| 132 #endif | |
| 133 void verify(); | |
| 134 }; | |
| 135 | |
| 136 // The following classes can be in dictionary.cpp, but we need these | |
| 12837 | 137 // to be in header file so that SA's vmStructs can access them. |
| 138 class ProtectionDomainCacheEntry : public HashtableEntry<oop, mtClass> { | |
| 139 friend class VMStructs; | |
| 140 private: | |
| 141 // Flag indicating whether this protection domain entry is strongly reachable. | |
| 142 // Used during iterating over the system dictionary to remember oops that need | |
| 143 // to be updated. | |
| 144 bool _strongly_reachable; | |
| 145 public: | |
| 146 oop protection_domain() { return literal(); } | |
| 147 | |
| 148 void init() { | |
| 149 _strongly_reachable = false; | |
| 150 } | |
| 151 | |
| 152 ProtectionDomainCacheEntry* next() { | |
| 153 return (ProtectionDomainCacheEntry*)HashtableEntry<oop, mtClass>::next(); | |
| 154 } | |
| 155 | |
| 156 ProtectionDomainCacheEntry** next_addr() { | |
| 157 return (ProtectionDomainCacheEntry**)HashtableEntry<oop, mtClass>::next_addr(); | |
| 158 } | |
| 159 | |
| 160 void oops_do(OopClosure* f) { | |
| 161 f->do_oop(literal_addr()); | |
| 162 } | |
| 163 | |
| 164 void set_strongly_reachable() { _strongly_reachable = true; } | |
| 165 bool is_strongly_reachable() { return _strongly_reachable; } | |
| 166 void reset_strongly_reachable() { _strongly_reachable = false; } | |
| 167 | |
| 168 void print() PRODUCT_RETURN; | |
| 169 void verify(); | |
| 170 }; | |
| 171 | |
| 172 // The ProtectionDomainCacheTable contains all protection domain oops. The system | |
| 173 // dictionary entries reference its entries instead of having references to oops | |
| 174 // directly. | |
| 175 // This is used to speed up system dictionary iteration: the oops in the | |
| 176 // protection domain are the only ones referring the Java heap. So when there is | |
| 177 // need to update these, instead of going over every entry of the system dictionary, | |
| 178 // we only need to iterate over this set. | |
| 179 // The amount of different protection domains used is typically magnitudes smaller | |
| 180 // than the number of system dictionary entries (loaded classes). | |
| 181 class ProtectionDomainCacheTable : public Hashtable<oop, mtClass> { | |
| 182 friend class VMStructs; | |
| 183 private: | |
| 184 ProtectionDomainCacheEntry* bucket(int i) { | |
| 185 return (ProtectionDomainCacheEntry*) Hashtable<oop, mtClass>::bucket(i); | |
| 186 } | |
| 187 | |
| 188 // The following method is not MT-safe and must be done under lock. | |
| 189 ProtectionDomainCacheEntry** bucket_addr(int i) { | |
| 190 return (ProtectionDomainCacheEntry**) Hashtable<oop, mtClass>::bucket_addr(i); | |
| 191 } | |
| 192 | |
| 193 ProtectionDomainCacheEntry* new_entry(unsigned int hash, oop protection_domain) { | |
| 194 ProtectionDomainCacheEntry* entry = (ProtectionDomainCacheEntry*) Hashtable<oop, mtClass>::new_entry(hash, protection_domain); | |
| 195 entry->init(); | |
| 196 return entry; | |
| 197 } | |
| 198 | |
| 199 static unsigned int compute_hash(oop protection_domain) { | |
| 200 return (unsigned int)(protection_domain->identity_hash()); | |
| 201 } | |
| 202 | |
| 203 int index_for(oop protection_domain) { | |
| 204 return hash_to_index(compute_hash(protection_domain)); | |
| 205 } | |
| 206 | |
| 207 ProtectionDomainCacheEntry* add_entry(int index, unsigned int hash, oop protection_domain); | |
| 208 ProtectionDomainCacheEntry* find_entry(int index, oop protection_domain); | |
| 209 | |
| 210 public: | |
| 211 | |
| 212 ProtectionDomainCacheTable(int table_size); | |
| 213 | |
| 214 ProtectionDomainCacheEntry* get(oop protection_domain); | |
| 215 void free(ProtectionDomainCacheEntry* entry); | |
| 216 | |
| 217 void unlink(BoolObjectClosure* cl); | |
| 218 | |
| 219 // GC support | |
| 220 void oops_do(OopClosure* f); | |
| 221 void always_strong_oops_do(OopClosure* f); | |
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222 void roots_oops_do(OopClosure* strong, OopClosure* weak); |
| 12837 | 223 |
| 224 static uint bucket_size(); | |
| 225 | |
| 226 void print() PRODUCT_RETURN; | |
| 227 void verify(); | |
| 228 }; | |
| 229 | |
| 0 | 230 |
| 6197 | 231 class ProtectionDomainEntry :public CHeapObj<mtClass> { |
| 0 | 232 friend class VMStructs; |
| 233 public: | |
| 234 ProtectionDomainEntry* _next; | |
| 12837 | 235 ProtectionDomainCacheEntry* _pd_cache; |
| 0 | 236 |
| 12837 | 237 ProtectionDomainEntry(ProtectionDomainCacheEntry* pd_cache, ProtectionDomainEntry* next) { |
| 238 _pd_cache = pd_cache; | |
| 239 _next = next; | |
| 0 | 240 } |
| 241 | |
| 242 ProtectionDomainEntry* next() { return _next; } | |
| 12837 | 243 oop protection_domain() { return _pd_cache->protection_domain(); } |
| 0 | 244 }; |
| 245 | |
| 246 // An entry in the system dictionary, this describes a class as | |
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247 // { Klass*, loader, protection_domain }. |
| 0 | 248 |
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249 class DictionaryEntry : public HashtableEntry<Klass*, mtClass> { |
| 0 | 250 friend class VMStructs; |
| 251 private: | |
| 252 // Contains the set of approved protection domains that can access | |
| 253 // this system dictionary entry. | |
| 12837 | 254 // |
| 255 // This protection domain set is a set of tuples: | |
| 256 // | |
| 257 // (InstanceKlass C, initiating class loader ICL, Protection Domain PD) | |
| 258 // | |
| 259 // [Note that C.protection_domain(), which is stored in the java.lang.Class | |
| 260 // mirror of C, is NOT the same as PD] | |
| 261 // | |
| 262 // If such an entry (C, ICL, PD) exists in the table, it means that | |
| 263 // it is okay for a class Foo to reference C, where | |
| 264 // | |
| 265 // Foo.protection_domain() == PD, and | |
| 266 // Foo's defining class loader == ICL | |
| 267 // | |
| 268 // The usage of the PD set can be seen in SystemDictionary::validate_protection_domain() | |
| 269 // It is essentially a cache to avoid repeated Java up-calls to | |
| 270 // ClassLoader.checkPackageAccess(). | |
| 271 // | |
| 0 | 272 ProtectionDomainEntry* _pd_set; |
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273 ClassLoaderData* _loader_data; |
| 0 | 274 |
| 275 public: | |
| 276 // Tells whether a protection is in the approved set. | |
| 277 bool contains_protection_domain(oop protection_domain) const; | |
| 278 // Adds a protection domain to the approved set. | |
| 12837 | 279 void add_protection_domain(Dictionary* dict, oop protection_domain); |
| 0 | 280 |
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281 Klass* klass() const { return (Klass*)literal(); } |
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282 Klass** klass_addr() { return (Klass**)literal_addr(); } |
| 0 | 283 |
| 284 DictionaryEntry* next() const { | |
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285 return (DictionaryEntry*)HashtableEntry<Klass*, mtClass>::next(); |
| 0 | 286 } |
| 287 | |
| 288 DictionaryEntry** next_addr() { | |
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289 return (DictionaryEntry**)HashtableEntry<Klass*, mtClass>::next_addr(); |
| 0 | 290 } |
| 291 | |
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292 ClassLoaderData* loader_data() const { return _loader_data; } |
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293 void set_loader_data(ClassLoaderData* loader_data) { _loader_data = loader_data; } |
| 0 | 294 |
| 295 ProtectionDomainEntry* pd_set() const { return _pd_set; } | |
| 296 void set_pd_set(ProtectionDomainEntry* pd_set) { _pd_set = pd_set; } | |
| 297 | |
| 298 bool has_protection_domain() { return _pd_set != NULL; } | |
| 299 | |
| 300 // Tells whether the initiating class' protection can access the this _klass | |
| 301 bool is_valid_protection_domain(Handle protection_domain) { | |
| 302 if (!ProtectionDomainVerification) return true; | |
| 303 if (!SystemDictionary::has_checkPackageAccess()) return true; | |
| 304 | |
| 305 return protection_domain() == NULL | |
| 306 ? true | |
| 307 : contains_protection_domain(protection_domain()); | |
| 308 } | |
| 309 | |
| 12837 | 310 void set_strongly_reachable() { |
| 0 | 311 for (ProtectionDomainEntry* current = _pd_set; |
| 312 current != NULL; | |
| 313 current = current->_next) { | |
| 12837 | 314 current->_pd_cache->set_strongly_reachable(); |
| 0 | 315 } |
| 316 } | |
| 317 | |
| 318 void verify_protection_domain_set() { | |
| 319 for (ProtectionDomainEntry* current = _pd_set; | |
| 320 current != NULL; | |
| 321 current = current->_next) { | |
| 12837 | 322 current->_pd_cache->protection_domain()->verify(); |
| 0 | 323 } |
| 324 } | |
| 325 | |
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326 bool equals(Symbol* class_name, ClassLoaderData* loader_data) const { |
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327 Klass* klass = (Klass*)literal(); |
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328 return (InstanceKlass::cast(klass)->name() == class_name && |
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329 _loader_data == loader_data); |
| 0 | 330 } |
| 331 | |
| 332 void print() { | |
| 333 int count = 0; | |
| 334 for (ProtectionDomainEntry* current = _pd_set; | |
| 335 current != NULL; | |
| 336 current = current->_next) { | |
| 337 count++; | |
| 338 } | |
| 339 tty->print_cr("pd set = #%d", count); | |
| 340 } | |
| 341 }; | |
| 710 | 342 |
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343 // Entry in a SymbolPropertyTable, mapping a single Symbol* |
| 710 | 344 // to a managed and an unmanaged pointer. |
| 6197 | 345 class SymbolPropertyEntry : public HashtableEntry<Symbol*, mtSymbol> { |
| 710 | 346 friend class VMStructs; |
| 347 private: | |
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348 intptr_t _symbol_mode; // secondary key |
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349 Method* _method; |
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350 oop _method_type; |
| 710 | 351 |
| 352 public: | |
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353 Symbol* symbol() const { return literal(); } |
| 710 | 354 |
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355 intptr_t symbol_mode() const { return _symbol_mode; } |
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356 void set_symbol_mode(intptr_t m) { _symbol_mode = m; } |
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357 |
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358 Method* method() const { return _method; } |
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359 void set_method(Method* p) { _method = p; } |
| 710 | 360 |
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361 oop method_type() const { return _method_type; } |
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362 oop* method_type_addr() { return &_method_type; } |
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363 void set_method_type(oop p) { _method_type = p; } |
| 710 | 364 |
| 365 SymbolPropertyEntry* next() const { | |
| 6197 | 366 return (SymbolPropertyEntry*)HashtableEntry<Symbol*, mtSymbol>::next(); |
| 710 | 367 } |
| 368 | |
| 369 SymbolPropertyEntry** next_addr() { | |
| 6197 | 370 return (SymbolPropertyEntry**)HashtableEntry<Symbol*, mtSymbol>::next_addr(); |
| 710 | 371 } |
| 372 | |
| 373 void print_on(outputStream* st) const { | |
| 374 symbol()->print_value_on(st); | |
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375 st->print("/mode="INTX_FORMAT, symbol_mode()); |
| 710 | 376 st->print(" -> "); |
| 377 bool printed = false; | |
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378 if (method() != NULL) { |
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379 method()->print_value_on(st); |
| 710 | 380 printed = true; |
| 381 } | |
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382 if (method_type() != NULL) { |
| 710 | 383 if (printed) st->print(" and "); |
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384 st->print(INTPTR_FORMAT, p2i((void *)method_type())); |
| 710 | 385 printed = true; |
| 386 } | |
| 387 st->print_cr(printed ? "" : "(empty)"); | |
| 388 } | |
| 389 }; | |
| 390 | |
| 391 // A system-internal mapping of symbols to pointers, both managed | |
| 392 // and unmanaged. Used to record the auto-generation of each method | |
| 393 // MethodHandle.invoke(S)T, for all signatures (S)T. | |
| 6197 | 394 class SymbolPropertyTable : public Hashtable<Symbol*, mtSymbol> { |
| 710 | 395 friend class VMStructs; |
| 396 private: | |
| 397 SymbolPropertyEntry* bucket(int i) { | |
| 6197 | 398 return (SymbolPropertyEntry*) Hashtable<Symbol*, mtSymbol>::bucket(i); |
| 710 | 399 } |
| 400 | |
| 401 // The following method is not MT-safe and must be done under lock. | |
| 402 SymbolPropertyEntry** bucket_addr(int i) { | |
| 6197 | 403 return (SymbolPropertyEntry**) Hashtable<Symbol*, mtSymbol>::bucket_addr(i); |
| 710 | 404 } |
| 405 | |
| 406 void add_entry(int index, SymbolPropertyEntry* new_entry) { | |
| 407 ShouldNotReachHere(); | |
| 408 } | |
| 409 void set_entry(int index, SymbolPropertyEntry* new_entry) { | |
| 410 ShouldNotReachHere(); | |
| 411 } | |
| 412 | |
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413 SymbolPropertyEntry* new_entry(unsigned int hash, Symbol* symbol, intptr_t symbol_mode) { |
| 6197 | 414 SymbolPropertyEntry* entry = (SymbolPropertyEntry*) Hashtable<Symbol*, mtSymbol>::new_entry(hash, symbol); |
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415 // Hashtable with Symbol* literal must increment and decrement refcount. |
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416 symbol->increment_refcount(); |
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417 entry->set_symbol_mode(symbol_mode); |
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418 entry->set_method(NULL); |
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419 entry->set_method_type(NULL); |
| 710 | 420 return entry; |
| 421 } | |
| 422 | |
| 423 public: | |
| 424 SymbolPropertyTable(int table_size); | |
| 6197 | 425 SymbolPropertyTable(int table_size, HashtableBucket<mtSymbol>* t, int number_of_entries); |
| 710 | 426 |
| 427 void free_entry(SymbolPropertyEntry* entry) { | |
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428 // decrement Symbol refcount here because hashtable doesn't. |
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429 entry->literal()->decrement_refcount(); |
| 6197 | 430 Hashtable<Symbol*, mtSymbol>::free_entry(entry); |
| 710 | 431 } |
| 432 | |
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433 unsigned int compute_hash(Symbol* sym, intptr_t symbol_mode) { |
| 710 | 434 // Use the regular identity_hash. |
| 6197 | 435 return Hashtable<Symbol*, mtSymbol>::compute_hash(sym) ^ symbol_mode; |
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436 } |
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437 |
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438 int index_for(Symbol* name, intptr_t symbol_mode) { |
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439 return hash_to_index(compute_hash(name, symbol_mode)); |
| 710 | 440 } |
| 441 | |
| 442 // need not be locked; no state change | |
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443 SymbolPropertyEntry* find_entry(int index, unsigned int hash, Symbol* name, intptr_t name_mode); |
| 710 | 444 |
| 445 // must be done under SystemDictionary_lock | |
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446 SymbolPropertyEntry* add_entry(int index, unsigned int hash, Symbol* name, intptr_t name_mode); |
| 710 | 447 |
| 448 // GC support | |
| 449 void oops_do(OopClosure* f); | |
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450 |
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451 void methods_do(void f(Method*)); |
| 710 | 452 |
| 453 // Sharing support | |
| 454 void reorder_dictionary(); | |
| 455 | |
| 456 #ifndef PRODUCT | |
| 457 void print(); | |
| 458 #endif | |
| 459 void verify(); | |
| 460 }; | |
| 1972 | 461 #endif // SHARE_VM_CLASSFILE_DICTIONARY_HPP |