Mercurial > hg > truffle
annotate src/share/vm/classfile/systemDictionary.cpp @ 1507:cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
Summary: split MethodHandle.invoke into invokeExact and invokeGeneric; also clean up JVM-to-Java interfaces
Reviewed-by: twisti
| author | jrose |
|---|---|
| date | Sat, 01 May 2010 02:42:18 -0700 |
| parents | 09ac706c2623 |
| children | 2ffde6cfe049 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 579 | 2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 # include "incls/_precompiled.incl" | |
| 26 # include "incls/_systemDictionary.cpp.incl" | |
| 27 | |
| 28 | |
| 29 Dictionary* SystemDictionary::_dictionary = NULL; | |
| 30 PlaceholderTable* SystemDictionary::_placeholders = NULL; | |
| 31 Dictionary* SystemDictionary::_shared_dictionary = NULL; | |
| 32 LoaderConstraintTable* SystemDictionary::_loader_constraints = NULL; | |
| 33 ResolutionErrorTable* SystemDictionary::_resolution_errors = NULL; | |
| 710 | 34 SymbolPropertyTable* SystemDictionary::_invoke_method_table = NULL; |
| 0 | 35 |
| 36 | |
| 37 int SystemDictionary::_number_of_modifications = 0; | |
| 38 | |
| 39 oop SystemDictionary::_system_loader_lock_obj = NULL; | |
| 40 | |
|
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41 klassOop SystemDictionary::_well_known_klasses[SystemDictionary::WKID_LIMIT] |
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42 = { NULL /*, NULL...*/ }; |
| 0 | 43 |
| 44 klassOop SystemDictionary::_box_klasses[T_VOID+1] = { NULL /*, NULL...*/ }; | |
| 45 | |
| 46 oop SystemDictionary::_java_system_loader = NULL; | |
| 47 | |
| 48 bool SystemDictionary::_has_loadClassInternal = false; | |
| 49 bool SystemDictionary::_has_checkPackageAccess = false; | |
| 50 | |
| 51 // lazily initialized klass variables | |
| 52 volatile klassOop SystemDictionary::_abstract_ownable_synchronizer_klass = NULL; | |
| 53 | |
| 54 | |
| 55 // ---------------------------------------------------------------------------- | |
| 56 // Java-level SystemLoader | |
| 57 | |
| 58 oop SystemDictionary::java_system_loader() { | |
| 59 return _java_system_loader; | |
| 60 } | |
| 61 | |
| 62 void SystemDictionary::compute_java_system_loader(TRAPS) { | |
| 1142 | 63 KlassHandle system_klass(THREAD, WK_KLASS(ClassLoader_klass)); |
| 0 | 64 JavaValue result(T_OBJECT); |
| 65 JavaCalls::call_static(&result, | |
| 1142 | 66 KlassHandle(THREAD, WK_KLASS(ClassLoader_klass)), |
| 0 | 67 vmSymbolHandles::getSystemClassLoader_name(), |
| 68 vmSymbolHandles::void_classloader_signature(), | |
| 69 CHECK); | |
| 70 | |
| 71 _java_system_loader = (oop)result.get_jobject(); | |
| 72 } | |
| 73 | |
| 74 | |
| 75 // ---------------------------------------------------------------------------- | |
| 76 // debugging | |
| 77 | |
| 78 #ifdef ASSERT | |
| 79 | |
| 80 // return true if class_name contains no '.' (internal format is '/') | |
| 81 bool SystemDictionary::is_internal_format(symbolHandle class_name) { | |
| 82 if (class_name.not_null()) { | |
| 83 ResourceMark rm; | |
| 84 char* name = class_name->as_C_string(); | |
| 85 return strchr(name, '.') == NULL; | |
| 86 } else { | |
| 87 return true; | |
| 88 } | |
| 89 } | |
| 90 | |
| 91 #endif | |
| 92 | |
| 93 // ---------------------------------------------------------------------------- | |
| 514 | 94 // Parallel class loading check |
| 95 | |
| 96 bool SystemDictionary::is_parallelCapable(Handle class_loader) { | |
| 97 if (UnsyncloadClass || class_loader.is_null()) return true; | |
| 98 if (AlwaysLockClassLoader) return false; | |
| 99 return java_lang_Class::parallelCapable(class_loader()); | |
| 100 } | |
| 101 // ---------------------------------------------------------------------------- | |
|
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102 // ParallelDefineClass flag does not apply to bootclass loader |
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103 bool SystemDictionary::is_parallelDefine(Handle class_loader) { |
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104 if (class_loader.is_null()) return false; |
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105 if (AllowParallelDefineClass && java_lang_Class::parallelCapable(class_loader())) { |
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106 return true; |
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107 } |
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108 return false; |
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109 } |
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110 // ---------------------------------------------------------------------------- |
| 0 | 111 // Resolving of classes |
| 112 | |
| 113 // Forwards to resolve_or_null | |
| 114 | |
| 115 klassOop SystemDictionary::resolve_or_fail(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS) { | |
| 116 klassOop klass = resolve_or_null(class_name, class_loader, protection_domain, THREAD); | |
| 117 if (HAS_PENDING_EXCEPTION || klass == NULL) { | |
| 118 KlassHandle k_h(THREAD, klass); | |
| 119 // can return a null klass | |
| 120 klass = handle_resolution_exception(class_name, class_loader, protection_domain, throw_error, k_h, THREAD); | |
| 121 } | |
| 122 return klass; | |
| 123 } | |
| 124 | |
| 125 klassOop SystemDictionary::handle_resolution_exception(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS) { | |
| 126 if (HAS_PENDING_EXCEPTION) { | |
| 127 // If we have a pending exception we forward it to the caller, unless throw_error is true, | |
| 128 // in which case we have to check whether the pending exception is a ClassNotFoundException, | |
| 129 // and if so convert it to a NoClassDefFoundError | |
| 130 // And chain the original ClassNotFoundException | |
| 1142 | 131 if (throw_error && PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass())) { |
| 0 | 132 ResourceMark rm(THREAD); |
| 133 assert(klass_h() == NULL, "Should not have result with exception pending"); | |
| 134 Handle e(THREAD, PENDING_EXCEPTION); | |
| 135 CLEAR_PENDING_EXCEPTION; | |
| 136 THROW_MSG_CAUSE_0(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string(), e); | |
| 137 } else { | |
| 138 return NULL; | |
| 139 } | |
| 140 } | |
| 141 // Class not found, throw appropriate error or exception depending on value of throw_error | |
| 142 if (klass_h() == NULL) { | |
| 143 ResourceMark rm(THREAD); | |
| 144 if (throw_error) { | |
| 145 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string()); | |
| 146 } else { | |
| 147 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), class_name->as_C_string()); | |
| 148 } | |
| 149 } | |
| 150 return (klassOop)klass_h(); | |
| 151 } | |
| 152 | |
| 153 | |
| 154 klassOop SystemDictionary::resolve_or_fail(symbolHandle class_name, | |
| 155 bool throw_error, TRAPS) | |
| 156 { | |
| 157 return resolve_or_fail(class_name, Handle(), Handle(), throw_error, THREAD); | |
| 158 } | |
| 159 | |
| 160 | |
| 161 // Forwards to resolve_instance_class_or_null | |
| 162 | |
| 163 klassOop SystemDictionary::resolve_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS) { | |
| 164 assert(!THREAD->is_Compiler_thread(), "Can not load classes with the Compiler thread"); | |
| 165 if (FieldType::is_array(class_name())) { | |
| 166 return resolve_array_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); | |
| 167 } else { | |
| 168 return resolve_instance_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); | |
| 169 } | |
| 170 } | |
| 171 | |
| 172 klassOop SystemDictionary::resolve_or_null(symbolHandle class_name, TRAPS) { | |
| 173 return resolve_or_null(class_name, Handle(), Handle(), THREAD); | |
| 174 } | |
| 175 | |
| 176 // Forwards to resolve_instance_class_or_null | |
| 177 | |
| 178 klassOop SystemDictionary::resolve_array_class_or_null(symbolHandle class_name, | |
| 179 Handle class_loader, | |
| 180 Handle protection_domain, | |
| 181 TRAPS) { | |
| 182 assert(FieldType::is_array(class_name()), "must be array"); | |
| 183 jint dimension; | |
| 184 symbolOop object_key; | |
| 185 klassOop k = NULL; | |
| 186 // dimension and object_key are assigned as a side-effect of this call | |
| 187 BasicType t = FieldType::get_array_info(class_name(), | |
| 188 &dimension, | |
| 189 &object_key, | |
| 190 CHECK_NULL); | |
| 191 | |
| 192 if (t == T_OBJECT) { | |
| 193 symbolHandle h_key(THREAD, object_key); | |
| 194 // naked oop "k" is OK here -- we assign back into it | |
| 195 k = SystemDictionary::resolve_instance_class_or_null(h_key, | |
| 196 class_loader, | |
| 197 protection_domain, | |
| 198 CHECK_NULL); | |
| 199 if (k != NULL) { | |
| 200 k = Klass::cast(k)->array_klass(dimension, CHECK_NULL); | |
| 201 } | |
| 202 } else { | |
| 203 k = Universe::typeArrayKlassObj(t); | |
| 204 k = typeArrayKlass::cast(k)->array_klass(dimension, CHECK_NULL); | |
| 205 } | |
| 206 return k; | |
| 207 } | |
| 208 | |
| 209 | |
| 210 // Must be called for any super-class or super-interface resolution | |
| 211 // during class definition to allow class circularity checking | |
| 212 // super-interface callers: | |
| 213 // parse_interfaces - for defineClass & jvmtiRedefineClasses | |
| 214 // super-class callers: | |
| 215 // ClassFileParser - for defineClass & jvmtiRedefineClasses | |
| 216 // load_shared_class - while loading a class from shared archive | |
| 514 | 217 // resolve_instance_class_or_null: |
| 218 // via: handle_parallel_super_load | |
| 0 | 219 // when resolving a class that has an existing placeholder with |
| 220 // a saved superclass [i.e. a defineClass is currently in progress] | |
| 221 // if another thread is trying to resolve the class, it must do | |
| 222 // super-class checks on its own thread to catch class circularity | |
| 223 // This last call is critical in class circularity checking for cases | |
| 224 // where classloading is delegated to different threads and the | |
| 225 // classloader lock is released. | |
| 226 // Take the case: Base->Super->Base | |
| 227 // 1. If thread T1 tries to do a defineClass of class Base | |
| 228 // resolve_super_or_fail creates placeholder: T1, Base (super Super) | |
| 229 // 2. resolve_instance_class_or_null does not find SD or placeholder for Super | |
| 230 // so it tries to load Super | |
| 231 // 3. If we load the class internally, or user classloader uses same thread | |
| 232 // loadClassFromxxx or defineClass via parseClassFile Super ... | |
| 233 // 3.1 resolve_super_or_fail creates placeholder: T1, Super (super Base) | |
| 234 // 3.3 resolve_instance_class_or_null Base, finds placeholder for Base | |
| 235 // 3.4 calls resolve_super_or_fail Base | |
| 236 // 3.5 finds T1,Base -> throws class circularity | |
| 237 //OR 4. If T2 tries to resolve Super via defineClass Super ... | |
| 238 // 4.1 resolve_super_or_fail creates placeholder: T2, Super (super Base) | |
| 239 // 4.2 resolve_instance_class_or_null Base, finds placeholder for Base (super Super) | |
| 240 // 4.3 calls resolve_super_or_fail Super in parallel on own thread T2 | |
| 241 // 4.4 finds T2, Super -> throws class circularity | |
| 242 // Must be called, even if superclass is null, since this is | |
| 243 // where the placeholder entry is created which claims this | |
| 244 // thread is loading this class/classloader. | |
| 245 klassOop SystemDictionary::resolve_super_or_fail(symbolHandle child_name, | |
| 246 symbolHandle class_name, | |
| 247 Handle class_loader, | |
| 248 Handle protection_domain, | |
| 249 bool is_superclass, | |
| 250 TRAPS) { | |
| 251 | |
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252 // Try to get one of the well-known klasses. |
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253 // They are trusted, and do not participate in circularities. |
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254 if (LinkWellKnownClasses) { |
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255 klassOop k = find_well_known_klass(class_name()); |
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256 if (k != NULL) { |
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257 return k; |
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258 } |
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259 } |
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260 |
| 0 | 261 // Double-check, if child class is already loaded, just return super-class,interface |
| 262 // Don't add a placedholder if already loaded, i.e. already in system dictionary | |
| 263 // Make sure there's a placeholder for the *child* before resolving. | |
| 264 // Used as a claim that this thread is currently loading superclass/classloader | |
| 265 // Used here for ClassCircularity checks and also for heap verification | |
| 266 // (every instanceKlass in the heap needs to be in the system dictionary | |
| 267 // or have a placeholder). | |
| 268 // Must check ClassCircularity before checking if super class is already loaded | |
| 269 // | |
| 270 // We might not already have a placeholder if this child_name was | |
| 271 // first seen via resolve_from_stream (jni_DefineClass or JVM_DefineClass); | |
| 272 // the name of the class might not be known until the stream is actually | |
| 273 // parsed. | |
| 274 // Bugs 4643874, 4715493 | |
| 275 // compute_hash can have a safepoint | |
| 276 | |
| 277 unsigned int d_hash = dictionary()->compute_hash(child_name, class_loader); | |
| 278 int d_index = dictionary()->hash_to_index(d_hash); | |
| 279 unsigned int p_hash = placeholders()->compute_hash(child_name, class_loader); | |
| 280 int p_index = placeholders()->hash_to_index(p_hash); | |
| 281 // can't throw error holding a lock | |
| 282 bool child_already_loaded = false; | |
| 283 bool throw_circularity_error = false; | |
| 284 { | |
| 285 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 286 klassOop childk = find_class(d_index, d_hash, child_name, class_loader); | |
| 287 klassOop quicksuperk; | |
| 288 // to support // loading: if child done loading, just return superclass | |
| 289 // if class_name, & class_loader don't match: | |
| 290 // if initial define, SD update will give LinkageError | |
| 291 // if redefine: compare_class_versions will give HIERARCHY_CHANGED | |
| 292 // so we don't throw an exception here. | |
| 293 // see: nsk redefclass014 & java.lang.instrument Instrument032 | |
| 294 if ((childk != NULL ) && (is_superclass) && | |
| 295 ((quicksuperk = instanceKlass::cast(childk)->super()) != NULL) && | |
| 296 | |
| 297 ((Klass::cast(quicksuperk)->name() == class_name()) && | |
| 298 (Klass::cast(quicksuperk)->class_loader() == class_loader()))) { | |
| 299 return quicksuperk; | |
| 300 } else { | |
| 301 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, class_loader); | |
| 302 if (probe && probe->check_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER)) { | |
| 303 throw_circularity_error = true; | |
| 304 } | |
| 514 | 305 } |
| 306 if (!throw_circularity_error) { | |
| 0 | 307 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, child_name, class_loader, PlaceholderTable::LOAD_SUPER, class_name, THREAD); |
| 308 } | |
| 309 } | |
| 310 if (throw_circularity_error) { | |
| 311 ResourceMark rm(THREAD); | |
| 312 THROW_MSG_0(vmSymbols::java_lang_ClassCircularityError(), child_name->as_C_string()); | |
| 313 } | |
| 314 | |
| 315 // java.lang.Object should have been found above | |
| 316 assert(class_name() != NULL, "null super class for resolving"); | |
| 317 // Resolve the super class or interface, check results on return | |
| 318 klassOop superk = NULL; | |
| 319 superk = SystemDictionary::resolve_or_null(class_name, | |
| 320 class_loader, | |
| 321 protection_domain, | |
| 322 THREAD); | |
| 323 | |
| 324 KlassHandle superk_h(THREAD, superk); | |
| 325 | |
| 326 // Note: clean up of placeholders currently in callers of | |
| 327 // resolve_super_or_fail - either at update_dictionary time | |
| 328 // or on error | |
| 329 { | |
| 330 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 331 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, class_loader); | |
| 332 if (probe != NULL) { | |
| 333 probe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER); | |
| 334 } | |
| 335 } | |
| 336 if (HAS_PENDING_EXCEPTION || superk_h() == NULL) { | |
| 337 // can null superk | |
| 338 superk_h = KlassHandle(THREAD, handle_resolution_exception(class_name, class_loader, protection_domain, true, superk_h, THREAD)); | |
| 339 } | |
| 340 | |
| 341 return superk_h(); | |
| 342 } | |
| 343 | |
| 344 void SystemDictionary::validate_protection_domain(instanceKlassHandle klass, | |
| 345 Handle class_loader, | |
| 346 Handle protection_domain, | |
| 347 TRAPS) { | |
| 348 if(!has_checkPackageAccess()) return; | |
| 349 | |
| 350 // Now we have to call back to java to check if the initating class has access | |
| 351 JavaValue result(T_VOID); | |
| 352 if (TraceProtectionDomainVerification) { | |
| 353 // Print out trace information | |
| 354 tty->print_cr("Checking package access"); | |
| 355 tty->print(" - class loader: "); class_loader()->print_value_on(tty); tty->cr(); | |
| 356 tty->print(" - protection domain: "); protection_domain()->print_value_on(tty); tty->cr(); | |
| 357 tty->print(" - loading: "); klass()->print_value_on(tty); tty->cr(); | |
| 358 } | |
| 359 | |
| 360 assert(class_loader() != NULL, "should not have non-null protection domain for null classloader"); | |
| 361 | |
| 1142 | 362 KlassHandle system_loader(THREAD, SystemDictionary::ClassLoader_klass()); |
| 0 | 363 JavaCalls::call_special(&result, |
| 364 class_loader, | |
| 365 system_loader, | |
| 366 vmSymbolHandles::checkPackageAccess_name(), | |
| 367 vmSymbolHandles::class_protectiondomain_signature(), | |
| 368 Handle(THREAD, klass->java_mirror()), | |
| 369 protection_domain, | |
| 370 THREAD); | |
| 371 | |
| 372 if (TraceProtectionDomainVerification) { | |
| 373 if (HAS_PENDING_EXCEPTION) { | |
| 374 tty->print_cr(" -> DENIED !!!!!!!!!!!!!!!!!!!!!"); | |
| 375 } else { | |
| 376 tty->print_cr(" -> granted"); | |
| 377 } | |
| 378 tty->cr(); | |
| 379 } | |
| 380 | |
| 381 if (HAS_PENDING_EXCEPTION) return; | |
| 382 | |
| 383 // If no exception has been thrown, we have validated the protection domain | |
| 384 // Insert the protection domain of the initiating class into the set. | |
| 385 { | |
| 386 // We recalculate the entry here -- we've called out to java since | |
| 387 // the last time it was calculated. | |
| 388 symbolHandle kn(THREAD, klass->name()); | |
| 389 unsigned int d_hash = dictionary()->compute_hash(kn, class_loader); | |
| 390 int d_index = dictionary()->hash_to_index(d_hash); | |
| 391 | |
| 392 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 393 { | |
| 394 // Note that we have an entry, and entries can be deleted only during GC, | |
| 395 // so we cannot allow GC to occur while we're holding this entry. | |
| 396 | |
| 397 // We're using a No_Safepoint_Verifier to catch any place where we | |
| 398 // might potentially do a GC at all. | |
| 399 // SystemDictionary::do_unloading() asserts that classes are only | |
| 400 // unloaded at a safepoint. | |
| 401 No_Safepoint_Verifier nosafepoint; | |
| 402 dictionary()->add_protection_domain(d_index, d_hash, klass, class_loader, | |
| 403 protection_domain, THREAD); | |
| 404 } | |
| 405 } | |
| 406 } | |
| 407 | |
| 408 // We only get here if this thread finds that another thread | |
| 409 // has already claimed the placeholder token for the current operation, | |
| 410 // but that other thread either never owned or gave up the | |
| 411 // object lock | |
| 412 // Waits on SystemDictionary_lock to indicate placeholder table updated | |
| 413 // On return, caller must recheck placeholder table state | |
| 414 // | |
| 415 // We only get here if | |
| 416 // 1) custom classLoader, i.e. not bootstrap classloader | |
| 417 // 2) UnsyncloadClass not set | |
| 418 // 3) custom classLoader has broken the class loader objectLock | |
| 419 // so another thread got here in parallel | |
| 420 // | |
| 421 // lockObject must be held. | |
| 422 // Complicated dance due to lock ordering: | |
| 423 // Must first release the classloader object lock to | |
| 424 // allow initial definer to complete the class definition | |
| 425 // and to avoid deadlock | |
| 426 // Reclaim classloader lock object with same original recursion count | |
| 427 // Must release SystemDictionary_lock after notify, since | |
| 428 // class loader lock must be claimed before SystemDictionary_lock | |
| 429 // to prevent deadlocks | |
| 430 // | |
| 431 // The notify allows applications that did an untimed wait() on | |
| 432 // the classloader object lock to not hang. | |
| 433 void SystemDictionary::double_lock_wait(Handle lockObject, TRAPS) { | |
| 434 assert_lock_strong(SystemDictionary_lock); | |
| 435 | |
| 436 bool calledholdinglock | |
| 437 = ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, lockObject); | |
| 438 assert(calledholdinglock,"must hold lock for notify"); | |
| 514 | 439 assert((!(lockObject() == _system_loader_lock_obj) && !is_parallelCapable(lockObject)), "unexpected double_lock_wait"); |
| 0 | 440 ObjectSynchronizer::notifyall(lockObject, THREAD); |
| 441 intptr_t recursions = ObjectSynchronizer::complete_exit(lockObject, THREAD); | |
| 442 SystemDictionary_lock->wait(); | |
| 443 SystemDictionary_lock->unlock(); | |
| 444 ObjectSynchronizer::reenter(lockObject, recursions, THREAD); | |
| 445 SystemDictionary_lock->lock(); | |
| 446 } | |
| 447 | |
| 448 // If the class in is in the placeholder table, class loading is in progress | |
| 449 // For cases where the application changes threads to load classes, it | |
| 450 // is critical to ClassCircularity detection that we try loading | |
| 451 // the superclass on the same thread internally, so we do parallel | |
| 452 // super class loading here. | |
| 453 // This also is critical in cases where the original thread gets stalled | |
| 454 // even in non-circularity situations. | |
| 455 // Note: only one thread can define the class, but multiple can resolve | |
| 456 // Note: must call resolve_super_or_fail even if null super - | |
| 514 | 457 // to force placeholder entry creation for this class for circularity detection |
| 0 | 458 // Caller must check for pending exception |
| 459 // Returns non-null klassOop if other thread has completed load | |
| 460 // and we are done, | |
| 461 // If return null klassOop and no pending exception, the caller must load the class | |
| 462 instanceKlassHandle SystemDictionary::handle_parallel_super_load( | |
| 463 symbolHandle name, symbolHandle superclassname, Handle class_loader, | |
| 464 Handle protection_domain, Handle lockObject, TRAPS) { | |
| 465 | |
| 466 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
| 467 unsigned int d_hash = dictionary()->compute_hash(name, class_loader); | |
| 468 int d_index = dictionary()->hash_to_index(d_hash); | |
| 469 unsigned int p_hash = placeholders()->compute_hash(name, class_loader); | |
| 470 int p_index = placeholders()->hash_to_index(p_hash); | |
| 471 | |
| 472 // superk is not used, resolve_super called for circularity check only | |
| 473 // This code is reached in two situations. One if this thread | |
| 474 // is loading the same class twice (e.g. ClassCircularity, or | |
| 475 // java.lang.instrument). | |
| 476 // The second is if another thread started the resolve_super first | |
| 477 // and has not yet finished. | |
| 478 // In both cases the original caller will clean up the placeholder | |
| 479 // entry on error. | |
| 480 klassOop superk = SystemDictionary::resolve_super_or_fail(name, | |
| 481 superclassname, | |
| 482 class_loader, | |
| 483 protection_domain, | |
| 484 true, | |
| 485 CHECK_(nh)); | |
| 486 // We don't redefine the class, so we just need to clean up if there | |
| 487 // was not an error (don't want to modify any system dictionary | |
| 488 // data structures). | |
| 489 { | |
| 490 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 491 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
| 492 SystemDictionary_lock->notify_all(); | |
| 493 } | |
| 494 | |
| 514 | 495 // parallelCapable class loaders do NOT wait for parallel superclass loads to complete |
| 496 // Serial class loaders and bootstrap classloader do wait for superclass loads | |
| 497 if (!class_loader.is_null() && is_parallelCapable(class_loader)) { | |
| 0 | 498 MutexLocker mu(SystemDictionary_lock, THREAD); |
| 499 // Check if classloading completed while we were loading superclass or waiting | |
| 500 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 501 if (check != NULL) { | |
| 502 // Klass is already loaded, so just return it | |
| 503 return(instanceKlassHandle(THREAD, check)); | |
| 504 } else { | |
| 505 return nh; | |
| 506 } | |
| 507 } | |
| 508 | |
| 509 // must loop to both handle other placeholder updates | |
| 510 // and spurious notifications | |
| 511 bool super_load_in_progress = true; | |
| 512 PlaceholderEntry* placeholder; | |
| 513 while (super_load_in_progress) { | |
| 514 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 515 // Check if classloading completed while we were loading superclass or waiting | |
| 516 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 517 if (check != NULL) { | |
| 518 // Klass is already loaded, so just return it | |
| 519 return(instanceKlassHandle(THREAD, check)); | |
| 520 } else { | |
| 521 placeholder = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
| 522 if (placeholder && placeholder->super_load_in_progress() ){ | |
| 523 // Before UnsyncloadClass: | |
| 524 // We only get here if the application has released the | |
| 525 // classloader lock when another thread was in the middle of loading a | |
| 526 // superclass/superinterface for this class, and now | |
| 527 // this thread is also trying to load this class. | |
| 528 // To minimize surprises, the first thread that started to | |
| 529 // load a class should be the one to complete the loading | |
| 530 // with the classfile it initially expected. | |
| 531 // This logic has the current thread wait once it has done | |
| 532 // all the superclass/superinterface loading it can, until | |
| 533 // the original thread completes the class loading or fails | |
| 534 // If it completes we will use the resulting instanceKlass | |
| 535 // which we will find below in the systemDictionary. | |
| 536 // We also get here for parallel bootstrap classloader | |
| 537 if (class_loader.is_null()) { | |
| 538 SystemDictionary_lock->wait(); | |
| 539 } else { | |
| 540 double_lock_wait(lockObject, THREAD); | |
| 541 } | |
| 542 } else { | |
| 543 // If not in SD and not in PH, other thread's load must have failed | |
| 544 super_load_in_progress = false; | |
| 545 } | |
| 546 } | |
| 547 } | |
| 548 return (nh); | |
| 549 } | |
| 550 | |
| 551 | |
| 552 klassOop SystemDictionary::resolve_instance_class_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS) { | |
| 553 assert(class_name.not_null() && !FieldType::is_array(class_name()), "invalid class name"); | |
| 554 // First check to see if we should remove wrapping L and ; | |
| 555 symbolHandle name; | |
| 556 if (FieldType::is_obj(class_name())) { | |
| 557 ResourceMark rm(THREAD); | |
| 558 // Ignore wrapping L and ;. | |
| 559 name = oopFactory::new_symbol_handle(class_name()->as_C_string() + 1, class_name()->utf8_length() - 2, CHECK_NULL); | |
| 560 } else { | |
| 561 name = class_name; | |
| 562 } | |
| 563 | |
| 564 // UseNewReflection | |
| 565 // Fix for 4474172; see evaluation for more details | |
| 566 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); | |
| 567 | |
| 568 // Do lookup to see if class already exist and the protection domain | |
| 569 // has the right access | |
| 570 unsigned int d_hash = dictionary()->compute_hash(name, class_loader); | |
| 571 int d_index = dictionary()->hash_to_index(d_hash); | |
| 572 klassOop probe = dictionary()->find(d_index, d_hash, name, class_loader, | |
| 573 protection_domain, THREAD); | |
| 574 if (probe != NULL) return probe; | |
| 575 | |
| 576 | |
| 577 // Non-bootstrap class loaders will call out to class loader and | |
| 578 // define via jvm/jni_DefineClass which will acquire the | |
| 579 // class loader object lock to protect against multiple threads | |
| 580 // defining the class in parallel by accident. | |
| 581 // This lock must be acquired here so the waiter will find | |
| 582 // any successful result in the SystemDictionary and not attempt | |
| 583 // the define | |
| 514 | 584 // ParallelCapable Classloaders and the bootstrap classloader, |
| 0 | 585 // or all classloaders with UnsyncloadClass do not acquire lock here |
| 586 bool DoObjectLock = true; | |
| 514 | 587 if (is_parallelCapable(class_loader)) { |
| 0 | 588 DoObjectLock = false; |
| 589 } | |
| 590 | |
| 591 unsigned int p_hash = placeholders()->compute_hash(name, class_loader); | |
| 592 int p_index = placeholders()->hash_to_index(p_hash); | |
| 593 | |
| 594 // Class is not in SystemDictionary so we have to do loading. | |
| 595 // Make sure we are synchronized on the class loader before we proceed | |
| 596 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
| 597 check_loader_lock_contention(lockObject, THREAD); | |
| 598 ObjectLocker ol(lockObject, THREAD, DoObjectLock); | |
| 599 | |
| 600 // Check again (after locking) if class already exist in SystemDictionary | |
| 601 bool class_has_been_loaded = false; | |
| 602 bool super_load_in_progress = false; | |
| 603 bool havesupername = false; | |
| 604 instanceKlassHandle k; | |
| 605 PlaceholderEntry* placeholder; | |
| 606 symbolHandle superclassname; | |
| 607 | |
| 608 { | |
| 609 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 610 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 611 if (check != NULL) { | |
| 612 // Klass is already loaded, so just return it | |
| 613 class_has_been_loaded = true; | |
| 614 k = instanceKlassHandle(THREAD, check); | |
| 615 } else { | |
| 616 placeholder = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
| 617 if (placeholder && placeholder->super_load_in_progress()) { | |
| 618 super_load_in_progress = true; | |
| 619 if (placeholder->havesupername() == true) { | |
| 620 superclassname = symbolHandle(THREAD, placeholder->supername()); | |
| 621 havesupername = true; | |
| 622 } | |
| 623 } | |
| 624 } | |
| 625 } | |
| 626 | |
| 627 // If the class in is in the placeholder table, class loading is in progress | |
| 628 if (super_load_in_progress && havesupername==true) { | |
| 629 k = SystemDictionary::handle_parallel_super_load(name, superclassname, | |
| 630 class_loader, protection_domain, lockObject, THREAD); | |
| 631 if (HAS_PENDING_EXCEPTION) { | |
| 632 return NULL; | |
| 633 } | |
| 634 if (!k.is_null()) { | |
| 635 class_has_been_loaded = true; | |
| 636 } | |
| 637 } | |
| 638 | |
| 639 if (!class_has_been_loaded) { | |
| 640 | |
| 641 // add placeholder entry to record loading instance class | |
| 642 // Five cases: | |
| 643 // All cases need to prevent modifying bootclasssearchpath | |
| 644 // in parallel with a classload of same classname | |
| 514 | 645 // Redefineclasses uses existence of the placeholder for the duration |
| 646 // of the class load to prevent concurrent redefinition of not completely | |
| 647 // defined classes. | |
| 0 | 648 // case 1. traditional classloaders that rely on the classloader object lock |
| 649 // - no other need for LOAD_INSTANCE | |
| 650 // case 2. traditional classloaders that break the classloader object lock | |
| 651 // as a deadlock workaround. Detection of this case requires that | |
| 652 // this check is done while holding the classloader object lock, | |
| 653 // and that lock is still held when calling classloader's loadClass. | |
| 654 // For these classloaders, we ensure that the first requestor | |
| 655 // completes the load and other requestors wait for completion. | |
| 656 // case 3. UnsyncloadClass - don't use objectLocker | |
| 657 // With this flag, we allow parallel classloading of a | |
| 658 // class/classloader pair | |
| 659 // case4. Bootstrap classloader - don't own objectLocker | |
| 660 // This classloader supports parallelism at the classloader level, | |
| 661 // but only allows a single load of a class/classloader pair. | |
| 662 // No performance benefit and no deadlock issues. | |
| 514 | 663 // case 5. parallelCapable user level classloaders - without objectLocker |
| 664 // Allow parallel classloading of a class/classloader pair | |
| 0 | 665 symbolHandle nullsymbolHandle; |
| 666 bool throw_circularity_error = false; | |
| 667 { | |
| 668 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 514 | 669 if (class_loader.is_null() || !is_parallelCapable(class_loader)) { |
| 0 | 670 PlaceholderEntry* oldprobe = placeholders()->get_entry(p_index, p_hash, name, class_loader); |
| 671 if (oldprobe) { | |
| 672 // only need check_seen_thread once, not on each loop | |
| 673 // 6341374 java/lang/Instrument with -Xcomp | |
| 674 if (oldprobe->check_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE)) { | |
| 675 throw_circularity_error = true; | |
| 676 } else { | |
| 677 // case 1: traditional: should never see load_in_progress. | |
| 678 while (!class_has_been_loaded && oldprobe && oldprobe->instance_load_in_progress()) { | |
| 679 | |
| 680 // case 4: bootstrap classloader: prevent futile classloading, | |
| 681 // wait on first requestor | |
| 682 if (class_loader.is_null()) { | |
| 683 SystemDictionary_lock->wait(); | |
| 684 } else { | |
| 685 // case 2: traditional with broken classloader lock. wait on first | |
| 686 // requestor. | |
| 687 double_lock_wait(lockObject, THREAD); | |
| 688 } | |
| 689 // Check if classloading completed while we were waiting | |
| 690 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 691 if (check != NULL) { | |
| 692 // Klass is already loaded, so just return it | |
| 693 k = instanceKlassHandle(THREAD, check); | |
| 694 class_has_been_loaded = true; | |
| 695 } | |
| 696 // check if other thread failed to load and cleaned up | |
| 697 oldprobe = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
| 698 } | |
| 699 } | |
| 700 } | |
| 701 } | |
| 702 // All cases: add LOAD_INSTANCE | |
| 514 | 703 // case 3: UnsyncloadClass || case 5: parallelCapable: allow competing threads to try |
| 0 | 704 // LOAD_INSTANCE in parallel |
| 705 // add placeholder entry even if error - callers will remove on error | |
| 514 | 706 if (!throw_circularity_error && !class_has_been_loaded) { |
| 0 | 707 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, name, class_loader, PlaceholderTable::LOAD_INSTANCE, nullsymbolHandle, THREAD); |
| 708 // For class loaders that do not acquire the classloader object lock, | |
| 709 // if they did not catch another thread holding LOAD_INSTANCE, | |
| 710 // need a check analogous to the acquire ObjectLocker/find_class | |
| 711 // i.e. now that we hold the LOAD_INSTANCE token on loading this class/CL | |
| 712 // one final check if the load has already completed | |
| 514 | 713 // class loaders holding the ObjectLock shouldn't find the class here |
| 0 | 714 klassOop check = find_class(d_index, d_hash, name, class_loader); |
| 715 if (check != NULL) { | |
| 716 // Klass is already loaded, so just return it | |
| 717 k = instanceKlassHandle(THREAD, check); | |
| 718 class_has_been_loaded = true; | |
| 719 newprobe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE); | |
| 514 | 720 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); |
| 721 SystemDictionary_lock->notify_all(); | |
| 0 | 722 } |
| 723 } | |
| 724 } | |
| 725 // must throw error outside of owning lock | |
| 726 if (throw_circularity_error) { | |
| 727 ResourceMark rm(THREAD); | |
| 728 THROW_MSG_0(vmSymbols::java_lang_ClassCircularityError(), name->as_C_string()); | |
| 729 } | |
| 730 | |
| 731 if (!class_has_been_loaded) { | |
| 732 | |
| 733 // Do actual loading | |
| 734 k = load_instance_class(name, class_loader, THREAD); | |
| 735 | |
|
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736 // For UnsyncloadClass only |
| 0 | 737 // If they got a linkageError, check if a parallel class load succeeded. |
| 738 // If it did, then for bytecode resolution the specification requires | |
| 739 // that we return the same result we did for the other thread, i.e. the | |
| 740 // successfully loaded instanceKlass | |
| 741 // Should not get here for classloaders that support parallelism | |
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742 // with the new cleaner mechanism, even with AllowParallelDefineClass |
| 514 | 743 // Bootstrap goes through here to allow for an extra guarantee check |
| 0 | 744 if (UnsyncloadClass || (class_loader.is_null())) { |
| 745 if (k.is_null() && HAS_PENDING_EXCEPTION | |
| 1142 | 746 && PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { |
| 0 | 747 MutexLocker mu(SystemDictionary_lock, THREAD); |
| 748 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 749 if (check != NULL) { | |
| 750 // Klass is already loaded, so just use it | |
| 751 k = instanceKlassHandle(THREAD, check); | |
| 752 CLEAR_PENDING_EXCEPTION; | |
| 753 guarantee((!class_loader.is_null()), "dup definition for bootstrap loader?"); | |
| 754 } | |
| 755 } | |
| 756 } | |
| 757 | |
| 758 // clean up placeholder entries for success or error | |
| 759 // This cleans up LOAD_INSTANCE entries | |
| 760 // It also cleans up LOAD_SUPER entries on errors from | |
| 761 // calling load_instance_class | |
| 762 { | |
| 763 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 764 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
| 765 if (probe != NULL) { | |
| 766 probe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE); | |
| 767 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
| 768 SystemDictionary_lock->notify_all(); | |
| 769 } | |
| 770 } | |
| 771 | |
| 772 // If everything was OK (no exceptions, no null return value), and | |
| 773 // class_loader is NOT the defining loader, do a little more bookkeeping. | |
| 774 if (!HAS_PENDING_EXCEPTION && !k.is_null() && | |
| 775 k->class_loader() != class_loader()) { | |
| 776 | |
| 777 check_constraints(d_index, d_hash, k, class_loader, false, THREAD); | |
| 778 | |
| 779 // Need to check for a PENDING_EXCEPTION again; check_constraints | |
| 780 // can throw and doesn't use the CHECK macro. | |
| 781 if (!HAS_PENDING_EXCEPTION) { | |
| 782 { // Grabbing the Compile_lock prevents systemDictionary updates | |
| 783 // during compilations. | |
| 784 MutexLocker mu(Compile_lock, THREAD); | |
| 785 update_dictionary(d_index, d_hash, p_index, p_hash, | |
| 786 k, class_loader, THREAD); | |
| 787 } | |
| 788 if (JvmtiExport::should_post_class_load()) { | |
| 789 Thread *thread = THREAD; | |
| 790 assert(thread->is_Java_thread(), "thread->is_Java_thread()"); | |
| 791 JvmtiExport::post_class_load((JavaThread *) thread, k()); | |
| 792 } | |
| 793 } | |
| 794 } | |
| 795 if (HAS_PENDING_EXCEPTION || k.is_null()) { | |
| 796 // On error, clean up placeholders | |
| 797 { | |
| 798 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 799 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
| 800 SystemDictionary_lock->notify_all(); | |
| 801 } | |
| 802 return NULL; | |
| 803 } | |
| 804 } | |
| 805 } | |
| 806 | |
| 807 #ifdef ASSERT | |
| 808 { | |
| 809 Handle loader (THREAD, k->class_loader()); | |
| 810 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 811 oop kk = find_class_or_placeholder(name, loader); | |
| 812 assert(kk == k(), "should be present in dictionary"); | |
| 813 } | |
| 814 #endif | |
| 815 | |
| 816 // return if the protection domain in NULL | |
| 817 if (protection_domain() == NULL) return k(); | |
| 818 | |
| 819 // Check the protection domain has the right access | |
| 820 { | |
| 821 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 822 // Note that we have an entry, and entries can be deleted only during GC, | |
| 823 // so we cannot allow GC to occur while we're holding this entry. | |
| 824 // We're using a No_Safepoint_Verifier to catch any place where we | |
| 825 // might potentially do a GC at all. | |
| 826 // SystemDictionary::do_unloading() asserts that classes are only | |
| 827 // unloaded at a safepoint. | |
| 828 No_Safepoint_Verifier nosafepoint; | |
| 829 if (dictionary()->is_valid_protection_domain(d_index, d_hash, name, | |
| 830 class_loader, | |
| 831 protection_domain)) { | |
| 832 return k(); | |
| 833 } | |
| 834 } | |
| 835 | |
| 836 // Verify protection domain. If it fails an exception is thrown | |
| 837 validate_protection_domain(k, class_loader, protection_domain, CHECK_(klassOop(NULL))); | |
| 838 | |
| 839 return k(); | |
| 840 } | |
| 841 | |
| 842 | |
| 843 // This routine does not lock the system dictionary. | |
| 844 // | |
| 845 // Since readers don't hold a lock, we must make sure that system | |
| 846 // dictionary entries are only removed at a safepoint (when only one | |
| 847 // thread is running), and are added to in a safe way (all links must | |
| 848 // be updated in an MT-safe manner). | |
| 849 // | |
| 850 // Callers should be aware that an entry could be added just after | |
| 851 // _dictionary->bucket(index) is read here, so the caller will not see | |
| 852 // the new entry. | |
| 853 | |
| 854 klassOop SystemDictionary::find(symbolHandle class_name, | |
| 855 Handle class_loader, | |
| 856 Handle protection_domain, | |
| 857 TRAPS) { | |
| 858 | |
|
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859 // UseNewReflection |
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860 // The result of this call should be consistent with the result |
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861 // of the call to resolve_instance_class_or_null(). |
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862 // See evaluation 6790209 and 4474172 for more details. |
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863 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); |
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864 |
| 0 | 865 unsigned int d_hash = dictionary()->compute_hash(class_name, class_loader); |
| 866 int d_index = dictionary()->hash_to_index(d_hash); | |
| 867 | |
| 868 { | |
| 869 // Note that we have an entry, and entries can be deleted only during GC, | |
| 870 // so we cannot allow GC to occur while we're holding this entry. | |
| 871 // We're using a No_Safepoint_Verifier to catch any place where we | |
| 872 // might potentially do a GC at all. | |
| 873 // SystemDictionary::do_unloading() asserts that classes are only | |
| 874 // unloaded at a safepoint. | |
| 875 No_Safepoint_Verifier nosafepoint; | |
| 876 return dictionary()->find(d_index, d_hash, class_name, class_loader, | |
| 877 protection_domain, THREAD); | |
| 878 } | |
| 879 } | |
| 880 | |
| 881 | |
| 882 // Look for a loaded instance or array klass by name. Do not do any loading. | |
| 883 // return NULL in case of error. | |
| 884 klassOop SystemDictionary::find_instance_or_array_klass(symbolHandle class_name, | |
| 885 Handle class_loader, | |
| 886 Handle protection_domain, | |
| 887 TRAPS) { | |
| 888 klassOop k = NULL; | |
| 889 assert(class_name() != NULL, "class name must be non NULL"); | |
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890 |
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891 // Try to get one of the well-known klasses. |
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892 if (LinkWellKnownClasses) { |
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893 k = find_well_known_klass(class_name()); |
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894 if (k != NULL) { |
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895 return k; |
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896 } |
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897 } |
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898 |
| 0 | 899 if (FieldType::is_array(class_name())) { |
| 900 // The name refers to an array. Parse the name. | |
| 901 jint dimension; | |
| 902 symbolOop object_key; | |
| 903 | |
| 904 // dimension and object_key are assigned as a side-effect of this call | |
| 905 BasicType t = FieldType::get_array_info(class_name(), &dimension, | |
| 906 &object_key, CHECK_(NULL)); | |
| 907 if (t != T_OBJECT) { | |
| 908 k = Universe::typeArrayKlassObj(t); | |
| 909 } else { | |
| 910 symbolHandle h_key(THREAD, object_key); | |
| 911 k = SystemDictionary::find(h_key, class_loader, protection_domain, THREAD); | |
| 912 } | |
| 913 if (k != NULL) { | |
| 914 k = Klass::cast(k)->array_klass_or_null(dimension); | |
| 915 } | |
| 916 } else { | |
| 917 k = find(class_name, class_loader, protection_domain, THREAD); | |
| 918 } | |
| 919 return k; | |
| 920 } | |
| 921 | |
|
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922 // Quick range check for names of well-known classes: |
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923 static symbolOop wk_klass_name_limits[2] = {NULL, NULL}; |
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924 |
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925 #ifndef PRODUCT |
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926 static int find_wkk_calls, find_wkk_probes, find_wkk_wins; |
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927 // counts for "hello world": 3983, 1616, 1075 |
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928 // => 60% hit after limit guard, 25% total win rate |
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929 #endif |
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930 |
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931 klassOop SystemDictionary::find_well_known_klass(symbolOop class_name) { |
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932 // A bounds-check on class_name will quickly get a negative result. |
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933 NOT_PRODUCT(find_wkk_calls++); |
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934 if (class_name >= wk_klass_name_limits[0] && |
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935 class_name <= wk_klass_name_limits[1]) { |
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936 NOT_PRODUCT(find_wkk_probes++); |
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937 vmSymbols::SID sid = vmSymbols::find_sid(class_name); |
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938 if (sid != vmSymbols::NO_SID) { |
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939 klassOop k = NULL; |
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940 switch (sid) { |
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941 #define WK_KLASS_CASE(name, symbol, ignore_option) \ |
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942 case vmSymbols::VM_SYMBOL_ENUM_NAME(symbol): \ |
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943 k = WK_KLASS(name); break; |
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944 WK_KLASSES_DO(WK_KLASS_CASE) |
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945 #undef WK_KLASS_CASE |
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946 } |
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947 NOT_PRODUCT(if (k != NULL) find_wkk_wins++); |
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948 return k; |
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949 } |
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950 } |
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951 return NULL; |
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952 } |
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953 |
| 0 | 954 // Note: this method is much like resolve_from_stream, but |
| 955 // updates no supplemental data structures. | |
| 956 // TODO consolidate the two methods with a helper routine? | |
| 957 klassOop SystemDictionary::parse_stream(symbolHandle class_name, | |
| 958 Handle class_loader, | |
| 959 Handle protection_domain, | |
| 960 ClassFileStream* st, | |
|
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961 KlassHandle host_klass, |
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962 GrowableArray<Handle>* cp_patches, |
| 0 | 963 TRAPS) { |
| 964 symbolHandle parsed_name; | |
| 965 | |
| 966 // Parse the stream. Note that we do this even though this klass might | |
| 967 // already be present in the SystemDictionary, otherwise we would not | |
| 968 // throw potential ClassFormatErrors. | |
| 969 // | |
| 970 // Note: "name" is updated. | |
| 971 // Further note: a placeholder will be added for this class when | |
| 972 // super classes are loaded (resolve_super_or_fail). We expect this | |
| 973 // to be called for all classes but java.lang.Object; and we preload | |
| 974 // java.lang.Object through resolve_or_fail, not this path. | |
| 975 | |
| 976 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
| 977 class_loader, | |
| 978 protection_domain, | |
| 710 | 979 host_klass, |
| 980 cp_patches, | |
| 0 | 981 parsed_name, |
|
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982 true, |
| 0 | 983 THREAD); |
| 984 | |
| 514 | 985 |
| 0 | 986 // We don't redefine the class, so we just need to clean up whether there |
| 987 // was an error or not (don't want to modify any system dictionary | |
| 988 // data structures). | |
| 989 // Parsed name could be null if we threw an error before we got far | |
| 990 // enough along to parse it -- in that case, there is nothing to clean up. | |
| 991 if (!parsed_name.is_null()) { | |
| 992 unsigned int p_hash = placeholders()->compute_hash(parsed_name, | |
| 993 class_loader); | |
| 994 int p_index = placeholders()->hash_to_index(p_hash); | |
| 995 { | |
| 996 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 997 placeholders()->find_and_remove(p_index, p_hash, parsed_name, class_loader, THREAD); | |
| 998 SystemDictionary_lock->notify_all(); | |
| 999 } | |
| 1000 } | |
| 1001 | |
|
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1002 if (host_klass.not_null() && k.not_null()) { |
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1003 assert(AnonymousClasses, ""); |
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1004 // If it's anonymous, initialize it now, since nobody else will. |
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1005 k->set_host_klass(host_klass()); |
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1006 |
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1007 { |
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1008 MutexLocker mu_r(Compile_lock, THREAD); |
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1009 |
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1010 // Add to class hierarchy, initialize vtables, and do possible |
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1011 // deoptimizations. |
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1012 add_to_hierarchy(k, CHECK_NULL); // No exception, but can block |
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1013 |
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1014 // But, do not add to system dictionary. |
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1015 } |
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1016 |
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1017 k->eager_initialize(THREAD); |
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1018 |
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1019 // notify jvmti |
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1020 if (JvmtiExport::should_post_class_load()) { |
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1021 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); |
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1022 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); |
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1023 } |
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1024 } |
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1025 |
| 0 | 1026 return k(); |
| 1027 } | |
| 1028 | |
| 1029 // Add a klass to the system from a stream (called by jni_DefineClass and | |
| 1030 // JVM_DefineClass). | |
| 1031 // Note: class_name can be NULL. In that case we do not know the name of | |
| 1032 // the class until we have parsed the stream. | |
| 1033 | |
| 1034 klassOop SystemDictionary::resolve_from_stream(symbolHandle class_name, | |
| 1035 Handle class_loader, | |
| 1036 Handle protection_domain, | |
| 1037 ClassFileStream* st, | |
|
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1038 bool verify, |
| 0 | 1039 TRAPS) { |
| 1040 | |
| 514 | 1041 // Classloaders that support parallelism, e.g. bootstrap classloader, |
| 1042 // or all classloaders with UnsyncloadClass do not acquire lock here | |
| 1043 bool DoObjectLock = true; | |
| 1044 if (is_parallelCapable(class_loader)) { | |
| 1045 DoObjectLock = false; | |
| 1046 } | |
| 1047 | |
| 1048 // Make sure we are synchronized on the class loader before we proceed | |
| 0 | 1049 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); |
| 1050 check_loader_lock_contention(lockObject, THREAD); | |
| 514 | 1051 ObjectLocker ol(lockObject, THREAD, DoObjectLock); |
| 0 | 1052 |
| 1053 symbolHandle parsed_name; | |
| 1054 | |
| 1055 // Parse the stream. Note that we do this even though this klass might | |
| 1056 // already be present in the SystemDictionary, otherwise we would not | |
| 1057 // throw potential ClassFormatErrors. | |
| 1058 // | |
| 1059 // Note: "name" is updated. | |
| 1060 // Further note: a placeholder will be added for this class when | |
| 1061 // super classes are loaded (resolve_super_or_fail). We expect this | |
| 1062 // to be called for all classes but java.lang.Object; and we preload | |
| 1063 // java.lang.Object through resolve_or_fail, not this path. | |
| 1064 | |
| 1065 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
| 1066 class_loader, | |
| 1067 protection_domain, | |
| 1068 parsed_name, | |
|
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1069 verify, |
| 0 | 1070 THREAD); |
| 1071 | |
| 1072 const char* pkg = "java/"; | |
| 1073 if (!HAS_PENDING_EXCEPTION && | |
| 1074 !class_loader.is_null() && | |
| 1075 !parsed_name.is_null() && | |
| 1076 !strncmp((const char*)parsed_name->bytes(), pkg, strlen(pkg))) { | |
| 1077 // It is illegal to define classes in the "java." package from | |
| 1078 // JVM_DefineClass or jni_DefineClass unless you're the bootclassloader | |
| 1079 ResourceMark rm(THREAD); | |
| 1080 char* name = parsed_name->as_C_string(); | |
| 1081 char* index = strrchr(name, '/'); | |
| 1082 *index = '\0'; // chop to just the package name | |
| 1083 while ((index = strchr(name, '/')) != NULL) { | |
| 1084 *index = '.'; // replace '/' with '.' in package name | |
| 1085 } | |
| 1086 const char* fmt = "Prohibited package name: %s"; | |
| 1087 size_t len = strlen(fmt) + strlen(name); | |
| 1088 char* message = NEW_RESOURCE_ARRAY(char, len); | |
| 1089 jio_snprintf(message, len, fmt, name); | |
| 1090 Exceptions::_throw_msg(THREAD_AND_LOCATION, | |
| 1091 vmSymbols::java_lang_SecurityException(), message); | |
| 1092 } | |
| 1093 | |
| 1094 if (!HAS_PENDING_EXCEPTION) { | |
| 1095 assert(!parsed_name.is_null(), "Sanity"); | |
| 1096 assert(class_name.is_null() || class_name() == parsed_name(), | |
| 1097 "name mismatch"); | |
| 1098 // Verification prevents us from creating names with dots in them, this | |
| 1099 // asserts that that's the case. | |
| 1100 assert(is_internal_format(parsed_name), | |
| 1101 "external class name format used internally"); | |
| 1102 | |
| 1103 // Add class just loaded | |
| 514 | 1104 // If a class loader supports parallel classloading handle parallel define requests |
| 1105 // find_or_define_instance_class may return a different instanceKlass | |
| 1106 if (is_parallelCapable(class_loader)) { | |
| 1107 k = find_or_define_instance_class(class_name, class_loader, k, THREAD); | |
| 1108 } else { | |
| 1109 define_instance_class(k, THREAD); | |
| 1110 } | |
| 0 | 1111 } |
| 1112 | |
| 1113 // If parsing the class file or define_instance_class failed, we | |
| 1114 // need to remove the placeholder added on our behalf. But we | |
| 1115 // must make sure parsed_name is valid first (it won't be if we had | |
| 1116 // a format error before the class was parsed far enough to | |
| 1117 // find the name). | |
| 1118 if (HAS_PENDING_EXCEPTION && !parsed_name.is_null()) { | |
| 1119 unsigned int p_hash = placeholders()->compute_hash(parsed_name, | |
| 1120 class_loader); | |
| 1121 int p_index = placeholders()->hash_to_index(p_hash); | |
| 1122 { | |
| 1123 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 1124 placeholders()->find_and_remove(p_index, p_hash, parsed_name, class_loader, THREAD); | |
| 1125 SystemDictionary_lock->notify_all(); | |
| 1126 } | |
| 1127 return NULL; | |
| 1128 } | |
| 1129 | |
| 1130 // Make sure that we didn't leave a place holder in the | |
| 1131 // SystemDictionary; this is only done on success | |
| 1132 debug_only( { | |
| 1133 if (!HAS_PENDING_EXCEPTION) { | |
| 1134 assert(!parsed_name.is_null(), "parsed_name is still null?"); | |
| 1135 symbolHandle h_name (THREAD, k->name()); | |
| 1136 Handle h_loader (THREAD, k->class_loader()); | |
| 1137 | |
| 1138 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 1139 | |
| 1140 oop check = find_class_or_placeholder(parsed_name, class_loader); | |
| 1141 assert(check == k(), "should be present in the dictionary"); | |
| 1142 | |
| 1143 oop check2 = find_class_or_placeholder(h_name, h_loader); | |
| 1144 assert(check == check2, "name inconsistancy in SystemDictionary"); | |
| 1145 } | |
| 1146 } ); | |
| 1147 | |
| 1148 return k(); | |
| 1149 } | |
| 1150 | |
| 1151 | |
| 1152 void SystemDictionary::set_shared_dictionary(HashtableBucket* t, int length, | |
| 1153 int number_of_entries) { | |
| 1154 assert(length == _nof_buckets * sizeof(HashtableBucket), | |
| 1155 "bad shared dictionary size."); | |
| 1156 _shared_dictionary = new Dictionary(_nof_buckets, t, number_of_entries); | |
| 1157 } | |
| 1158 | |
| 1159 | |
| 1160 // If there is a shared dictionary, then find the entry for the | |
| 1161 // given shared system class, if any. | |
| 1162 | |
| 1163 klassOop SystemDictionary::find_shared_class(symbolHandle class_name) { | |
| 1164 if (shared_dictionary() != NULL) { | |
| 1165 unsigned int d_hash = dictionary()->compute_hash(class_name, Handle()); | |
| 1166 int d_index = dictionary()->hash_to_index(d_hash); | |
| 1167 return shared_dictionary()->find_shared_class(d_index, d_hash, class_name); | |
| 1168 } else { | |
| 1169 return NULL; | |
| 1170 } | |
| 1171 } | |
| 1172 | |
| 1173 | |
| 1174 // Load a class from the shared spaces (found through the shared system | |
| 1175 // dictionary). Force the superclass and all interfaces to be loaded. | |
| 1176 // Update the class definition to include sibling classes and no | |
| 1177 // subclasses (yet). [Classes in the shared space are not part of the | |
| 1178 // object hierarchy until loaded.] | |
| 1179 | |
| 1180 instanceKlassHandle SystemDictionary::load_shared_class( | |
| 1181 symbolHandle class_name, Handle class_loader, TRAPS) { | |
| 1182 instanceKlassHandle ik (THREAD, find_shared_class(class_name)); | |
| 1183 return load_shared_class(ik, class_loader, THREAD); | |
| 1184 } | |
| 1185 | |
| 1186 // Note well! Changes to this method may affect oop access order | |
| 1187 // in the shared archive. Please take care to not make changes that | |
| 1188 // adversely affect cold start time by changing the oop access order | |
| 1189 // that is specified in dump.cpp MarkAndMoveOrderedReadOnly and | |
| 1190 // MarkAndMoveOrderedReadWrite closures. | |
| 1191 instanceKlassHandle SystemDictionary::load_shared_class( | |
| 1192 instanceKlassHandle ik, Handle class_loader, TRAPS) { | |
| 1193 assert(class_loader.is_null(), "non-null classloader for shared class?"); | |
| 1194 if (ik.not_null()) { | |
| 1195 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
| 1196 symbolHandle class_name(THREAD, ik->name()); | |
| 1197 | |
| 1198 // Found the class, now load the superclass and interfaces. If they | |
| 1199 // are shared, add them to the main system dictionary and reset | |
| 1200 // their hierarchy references (supers, subs, and interfaces). | |
| 1201 | |
| 1202 if (ik->super() != NULL) { | |
| 1203 symbolHandle cn(THREAD, ik->super()->klass_part()->name()); | |
| 1204 resolve_super_or_fail(class_name, cn, | |
| 1205 class_loader, Handle(), true, CHECK_(nh)); | |
| 1206 } | |
| 1207 | |
| 1208 objArrayHandle interfaces (THREAD, ik->local_interfaces()); | |
| 1209 int num_interfaces = interfaces->length(); | |
| 1210 for (int index = 0; index < num_interfaces; index++) { | |
| 1211 klassOop k = klassOop(interfaces->obj_at(index)); | |
| 1212 | |
| 1213 // Note: can not use instanceKlass::cast here because | |
| 1214 // interfaces' instanceKlass's C++ vtbls haven't been | |
| 1215 // reinitialized yet (they will be once the interface classes | |
| 1216 // are loaded) | |
| 1217 symbolHandle name (THREAD, k->klass_part()->name()); | |
| 1218 resolve_super_or_fail(class_name, name, class_loader, Handle(), false, CHECK_(nh)); | |
| 1219 } | |
| 1220 | |
| 1221 // Adjust methods to recover missing data. They need addresses for | |
| 1222 // interpreter entry points and their default native method address | |
| 1223 // must be reset. | |
| 1224 | |
| 1225 // Updating methods must be done under a lock so multiple | |
| 1226 // threads don't update these in parallel | |
| 1227 // Shared classes are all currently loaded by the bootstrap | |
| 1228 // classloader, so this will never cause a deadlock on | |
| 1229 // a custom class loader lock. | |
| 1230 | |
| 1231 { | |
| 1232 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
| 1233 check_loader_lock_contention(lockObject, THREAD); | |
| 1234 ObjectLocker ol(lockObject, THREAD, true); | |
| 1235 | |
| 1236 objArrayHandle methods (THREAD, ik->methods()); | |
| 1237 int num_methods = methods->length(); | |
| 1238 for (int index2 = 0; index2 < num_methods; ++index2) { | |
| 1239 methodHandle m(THREAD, methodOop(methods->obj_at(index2))); | |
| 1240 m()->link_method(m, CHECK_(nh)); | |
| 1241 } | |
| 1242 } | |
| 1243 | |
| 1244 if (TraceClassLoading) { | |
| 1245 ResourceMark rm; | |
| 1246 tty->print("[Loaded %s", ik->external_name()); | |
| 1247 tty->print(" from shared objects file"); | |
| 1248 tty->print_cr("]"); | |
| 1249 } | |
| 1250 // notify a class loaded from shared object | |
| 1251 ClassLoadingService::notify_class_loaded(instanceKlass::cast(ik()), | |
| 1252 true /* shared class */); | |
| 1253 } | |
| 1254 return ik; | |
| 1255 } | |
| 1256 | |
| 1257 #ifdef KERNEL | |
| 1258 // Some classes on the bootstrap class path haven't been installed on the | |
| 1259 // system yet. Call the DownloadManager method to make them appear in the | |
| 1260 // bootstrap class path and try again to load the named class. | |
| 1261 // Note that with delegation class loaders all classes in another loader will | |
| 1262 // first try to call this so it'd better be fast!! | |
| 1263 static instanceKlassHandle download_and_retry_class_load( | |
| 1264 symbolHandle class_name, | |
| 1265 TRAPS) { | |
| 1266 | |
| 1267 klassOop dlm = SystemDictionary::sun_jkernel_DownloadManager_klass(); | |
| 1268 instanceKlassHandle nk; | |
| 1269 | |
| 1270 // If download manager class isn't loaded just return. | |
| 1271 if (dlm == NULL) return nk; | |
| 1272 | |
| 1273 { HandleMark hm(THREAD); | |
| 1274 ResourceMark rm(THREAD); | |
| 1275 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nk)); | |
| 1276 Handle class_string = java_lang_String::externalize_classname(s, CHECK_(nk)); | |
| 1277 | |
| 1278 // return value | |
| 1279 JavaValue result(T_OBJECT); | |
| 1280 | |
| 1281 // Call the DownloadManager. We assume that it has a lock because | |
| 1282 // multiple classes could be not found and downloaded at the same time. | |
| 1283 // class sun.misc.DownloadManager; | |
| 1284 // public static String getBootClassPathEntryForClass(String className); | |
| 1285 JavaCalls::call_static(&result, | |
| 1286 KlassHandle(THREAD, dlm), | |
| 1287 vmSymbolHandles::getBootClassPathEntryForClass_name(), | |
| 1288 vmSymbolHandles::string_string_signature(), | |
| 1289 class_string, | |
| 1290 CHECK_(nk)); | |
| 1291 | |
| 1292 // Get result.string and add to bootclasspath | |
| 1293 assert(result.get_type() == T_OBJECT, "just checking"); | |
| 1294 oop obj = (oop) result.get_jobject(); | |
| 1295 if (obj == NULL) { return nk; } | |
| 1296 | |
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1297 Handle h_obj(THREAD, obj); |
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1298 char* new_class_name = java_lang_String::as_platform_dependent_str(h_obj, |
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1299 CHECK_(nk)); |
| 0 | 1300 |
| 1301 // lock the loader | |
| 1302 // we use this lock because JVMTI does. | |
| 1303 Handle loader_lock(THREAD, SystemDictionary::system_loader_lock()); | |
| 1304 | |
| 1305 ObjectLocker ol(loader_lock, THREAD); | |
| 1306 // add the file to the bootclasspath | |
| 1307 ClassLoader::update_class_path_entry_list(new_class_name, true); | |
| 1308 } // end HandleMark | |
| 1309 | |
| 1310 if (TraceClassLoading) { | |
| 1311 ClassLoader::print_bootclasspath(); | |
| 1312 } | |
| 1313 return ClassLoader::load_classfile(class_name, CHECK_(nk)); | |
| 1314 } | |
| 1315 #endif // KERNEL | |
| 1316 | |
| 1317 | |
| 1318 instanceKlassHandle SystemDictionary::load_instance_class(symbolHandle class_name, Handle class_loader, TRAPS) { | |
| 1319 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
| 1320 if (class_loader.is_null()) { | |
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1321 |
| 0 | 1322 // Search the shared system dictionary for classes preloaded into the |
| 1323 // shared spaces. | |
| 1324 instanceKlassHandle k; | |
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1325 { |
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1326 PerfTraceTime vmtimer(ClassLoader::perf_shared_classload_time()); |
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1327 k = load_shared_class(class_name, class_loader, THREAD); |
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1328 } |
| 0 | 1329 |
| 1330 if (k.is_null()) { | |
| 1331 // Use VM class loader | |
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1332 PerfTraceTime vmtimer(ClassLoader::perf_sys_classload_time()); |
| 0 | 1333 k = ClassLoader::load_classfile(class_name, CHECK_(nh)); |
| 1334 } | |
| 1335 | |
| 1336 #ifdef KERNEL | |
| 1337 // If the VM class loader has failed to load the class, call the | |
| 1338 // DownloadManager class to make it magically appear on the classpath | |
| 1339 // and try again. This is only configured with the Kernel VM. | |
| 1340 if (k.is_null()) { | |
| 1341 k = download_and_retry_class_load(class_name, CHECK_(nh)); | |
| 1342 } | |
| 1343 #endif // KERNEL | |
| 1344 | |
| 514 | 1345 // find_or_define_instance_class may return a different instanceKlass |
| 0 | 1346 if (!k.is_null()) { |
| 1347 k = find_or_define_instance_class(class_name, class_loader, k, CHECK_(nh)); | |
| 1348 } | |
| 1349 return k; | |
| 1350 } else { | |
| 1351 // Use user specified class loader to load class. Call loadClass operation on class_loader. | |
| 1352 ResourceMark rm(THREAD); | |
| 1353 | |
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1354 assert(THREAD->is_Java_thread(), "must be a JavaThread"); |
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1355 JavaThread* jt = (JavaThread*) THREAD; |
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1356 |
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1357 PerfClassTraceTime vmtimer(ClassLoader::perf_app_classload_time(), |
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1358 ClassLoader::perf_app_classload_selftime(), |
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1359 ClassLoader::perf_app_classload_count(), |
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1360 jt->get_thread_stat()->perf_recursion_counts_addr(), |
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1361 jt->get_thread_stat()->perf_timers_addr(), |
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1362 PerfClassTraceTime::CLASS_LOAD); |
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1363 |
| 0 | 1364 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nh)); |
| 1365 // Translate to external class name format, i.e., convert '/' chars to '.' | |
| 1366 Handle string = java_lang_String::externalize_classname(s, CHECK_(nh)); | |
| 1367 | |
| 1368 JavaValue result(T_OBJECT); | |
| 1369 | |
| 1142 | 1370 KlassHandle spec_klass (THREAD, SystemDictionary::ClassLoader_klass()); |
| 0 | 1371 |
| 514 | 1372 // Call public unsynchronized loadClass(String) directly for all class loaders |
| 1373 // for parallelCapable class loaders. JDK >=7, loadClass(String, boolean) will | |
| 1374 // acquire a class-name based lock rather than the class loader object lock. | |
| 1375 // JDK < 7 already acquire the class loader lock in loadClass(String, boolean), | |
| 1376 // so the call to loadClassInternal() was not required. | |
| 1377 // | |
| 1378 // UnsyncloadClass flag means both call loadClass(String) and do | |
| 1379 // not acquire the class loader lock even for class loaders that are | |
| 1380 // not parallelCapable. This was a risky transitional | |
| 1381 // flag for diagnostic purposes only. It is risky to call | |
| 0 | 1382 // custom class loaders without synchronization. |
| 1383 // WARNING If a custom class loader does NOT synchronizer findClass, or callers of | |
| 514 | 1384 // findClass, the UnsyncloadClass flag risks unexpected timing bugs in the field. |
| 0 | 1385 // Do NOT assume this will be supported in future releases. |
| 514 | 1386 // |
| 1387 // Added MustCallLoadClassInternal in case we discover in the field | |
| 1388 // a customer that counts on this call | |
| 1389 if (MustCallLoadClassInternal && has_loadClassInternal()) { | |
| 0 | 1390 JavaCalls::call_special(&result, |
| 1391 class_loader, | |
| 1392 spec_klass, | |
| 1393 vmSymbolHandles::loadClassInternal_name(), | |
| 1394 vmSymbolHandles::string_class_signature(), | |
| 1395 string, | |
| 1396 CHECK_(nh)); | |
| 1397 } else { | |
| 1398 JavaCalls::call_virtual(&result, | |
| 1399 class_loader, | |
| 1400 spec_klass, | |
| 1401 vmSymbolHandles::loadClass_name(), | |
| 1402 vmSymbolHandles::string_class_signature(), | |
| 1403 string, | |
| 1404 CHECK_(nh)); | |
| 1405 } | |
| 1406 | |
| 1407 assert(result.get_type() == T_OBJECT, "just checking"); | |
| 1408 oop obj = (oop) result.get_jobject(); | |
| 1409 | |
| 1410 // Primitive classes return null since forName() can not be | |
| 1411 // used to obtain any of the Class objects representing primitives or void | |
| 1412 if ((obj != NULL) && !(java_lang_Class::is_primitive(obj))) { | |
| 1413 instanceKlassHandle k = | |
| 1414 instanceKlassHandle(THREAD, java_lang_Class::as_klassOop(obj)); | |
| 1415 // For user defined Java class loaders, check that the name returned is | |
| 1416 // the same as that requested. This check is done for the bootstrap | |
| 1417 // loader when parsing the class file. | |
| 1418 if (class_name() == k->name()) { | |
| 1419 return k; | |
| 1420 } | |
| 1421 } | |
| 1422 // Class is not found or has the wrong name, return NULL | |
| 1423 return nh; | |
| 1424 } | |
| 1425 } | |
| 1426 | |
| 1427 void SystemDictionary::define_instance_class(instanceKlassHandle k, TRAPS) { | |
| 1428 | |
| 1429 Handle class_loader_h(THREAD, k->class_loader()); | |
| 1430 | |
| 514 | 1431 // for bootstrap and other parallel classloaders don't acquire lock, |
| 1432 // use placeholder token | |
| 1433 // If a parallelCapable class loader calls define_instance_class instead of | |
| 1434 // find_or_define_instance_class to get here, we have a timing | |
| 1435 // hole with systemDictionary updates and check_constraints | |
| 1436 if (!class_loader_h.is_null() && !is_parallelCapable(class_loader_h)) { | |
| 0 | 1437 assert(ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, |
| 1438 compute_loader_lock_object(class_loader_h, THREAD)), | |
| 1439 "define called without lock"); | |
| 1440 } | |
| 1441 | |
| 1442 // Check class-loading constraints. Throw exception if violation is detected. | |
| 1443 // Grabs and releases SystemDictionary_lock | |
| 1444 // The check_constraints/find_class call and update_dictionary sequence | |
| 1445 // must be "atomic" for a specific class/classloader pair so we never | |
| 1446 // define two different instanceKlasses for that class/classloader pair. | |
| 1447 // Existing classloaders will call define_instance_class with the | |
| 1448 // classloader lock held | |
| 1449 // Parallel classloaders will call find_or_define_instance_class | |
| 1450 // which will require a token to perform the define class | |
| 1451 symbolHandle name_h(THREAD, k->name()); | |
| 1452 unsigned int d_hash = dictionary()->compute_hash(name_h, class_loader_h); | |
| 1453 int d_index = dictionary()->hash_to_index(d_hash); | |
| 1454 check_constraints(d_index, d_hash, k, class_loader_h, true, CHECK); | |
| 1455 | |
| 1456 // Register class just loaded with class loader (placed in Vector) | |
| 1457 // Note we do this before updating the dictionary, as this can | |
| 1458 // fail with an OutOfMemoryError (if it does, we will *not* put this | |
| 1459 // class in the dictionary and will not update the class hierarchy). | |
| 1460 if (k->class_loader() != NULL) { | |
| 1461 methodHandle m(THREAD, Universe::loader_addClass_method()); | |
| 1462 JavaValue result(T_VOID); | |
| 1463 JavaCallArguments args(class_loader_h); | |
| 1464 args.push_oop(Handle(THREAD, k->java_mirror())); | |
| 1465 JavaCalls::call(&result, m, &args, CHECK); | |
| 1466 } | |
| 1467 | |
| 1468 // Add the new class. We need recompile lock during update of CHA. | |
| 1469 { | |
| 1470 unsigned int p_hash = placeholders()->compute_hash(name_h, class_loader_h); | |
| 1471 int p_index = placeholders()->hash_to_index(p_hash); | |
| 1472 | |
| 1473 MutexLocker mu_r(Compile_lock, THREAD); | |
| 1474 | |
| 1475 // Add to class hierarchy, initialize vtables, and do possible | |
| 1476 // deoptimizations. | |
| 1477 add_to_hierarchy(k, CHECK); // No exception, but can block | |
| 1478 | |
| 1479 // Add to systemDictionary - so other classes can see it. | |
| 1480 // Grabs and releases SystemDictionary_lock | |
| 1481 update_dictionary(d_index, d_hash, p_index, p_hash, | |
| 1482 k, class_loader_h, THREAD); | |
| 1483 } | |
| 1484 k->eager_initialize(THREAD); | |
| 1485 | |
| 1486 // notify jvmti | |
| 1487 if (JvmtiExport::should_post_class_load()) { | |
| 1488 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); | |
| 1489 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); | |
| 1490 | |
| 1491 } | |
| 1492 } | |
| 1493 | |
| 1494 // Support parallel classloading | |
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1495 // All parallel class loaders, including bootstrap classloader |
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1496 // lock a placeholder entry for this class/class_loader pair |
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1497 // to allow parallel defines of different classes for this class loader |
| 514 | 1498 // With AllowParallelDefine flag==true, in case they do not synchronize around |
| 1499 // FindLoadedClass/DefineClass, calls, we check for parallel | |
| 0 | 1500 // loading for them, wait if a defineClass is in progress |
| 1501 // and return the initial requestor's results | |
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1502 // This flag does not apply to the bootstrap classloader. |
| 514 | 1503 // With AllowParallelDefine flag==false, call through to define_instance_class |
| 1504 // which will throw LinkageError: duplicate class definition. | |
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1505 // False is the requested default. |
| 0 | 1506 // For better performance, the class loaders should synchronize |
| 514 | 1507 // findClass(), i.e. FindLoadedClass/DefineClassIfAbsent or they |
| 0 | 1508 // potentially waste time reading and parsing the bytestream. |
| 1509 // Note: VM callers should ensure consistency of k/class_name,class_loader | |
| 1510 instanceKlassHandle SystemDictionary::find_or_define_instance_class(symbolHandle class_name, Handle class_loader, instanceKlassHandle k, TRAPS) { | |
| 1511 | |
| 1512 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
| 515 | 1513 symbolHandle name_h(THREAD, k->name()); // passed in class_name may be null |
| 0 | 1514 |
| 515 | 1515 unsigned int d_hash = dictionary()->compute_hash(name_h, class_loader); |
| 0 | 1516 int d_index = dictionary()->hash_to_index(d_hash); |
| 1517 | |
| 1518 // Hold SD lock around find_class and placeholder creation for DEFINE_CLASS | |
| 515 | 1519 unsigned int p_hash = placeholders()->compute_hash(name_h, class_loader); |
| 0 | 1520 int p_index = placeholders()->hash_to_index(p_hash); |
| 1521 PlaceholderEntry* probe; | |
| 1522 | |
| 1523 { | |
| 1524 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 1525 // First check if class already defined | |
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1526 if (UnsyncloadClass || (is_parallelDefine(class_loader))) { |
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1527 klassOop check = find_class(d_index, d_hash, name_h, class_loader); |
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1528 if (check != NULL) { |
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1529 return(instanceKlassHandle(THREAD, check)); |
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1530 } |
| 0 | 1531 } |
| 1532 | |
| 1533 // Acquire define token for this class/classloader | |
| 1534 symbolHandle nullsymbolHandle; | |
| 515 | 1535 probe = placeholders()->find_and_add(p_index, p_hash, name_h, class_loader, PlaceholderTable::DEFINE_CLASS, nullsymbolHandle, THREAD); |
| 514 | 1536 // Wait if another thread defining in parallel |
| 1537 // All threads wait - even those that will throw duplicate class: otherwise | |
| 1538 // caller is surprised by LinkageError: duplicate, but findLoadedClass fails | |
| 1539 // if other thread has not finished updating dictionary | |
| 1540 while (probe->definer() != NULL) { | |
| 1541 SystemDictionary_lock->wait(); | |
| 1542 } | |
| 1543 // Only special cases allow parallel defines and can use other thread's results | |
| 1544 // Other cases fall through, and may run into duplicate defines | |
| 1545 // caught by finding an entry in the SystemDictionary | |
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1546 if ((UnsyncloadClass || is_parallelDefine(class_loader)) && (probe->instanceKlass() != NULL)) { |
| 0 | 1547 probe->remove_seen_thread(THREAD, PlaceholderTable::DEFINE_CLASS); |
| 515 | 1548 placeholders()->find_and_remove(p_index, p_hash, name_h, class_loader, THREAD); |
| 514 | 1549 SystemDictionary_lock->notify_all(); |
| 0 | 1550 #ifdef ASSERT |
| 515 | 1551 klassOop check = find_class(d_index, d_hash, name_h, class_loader); |
| 514 | 1552 assert(check != NULL, "definer missed recording success"); |
| 0 | 1553 #endif |
| 514 | 1554 return(instanceKlassHandle(THREAD, probe->instanceKlass())); |
| 0 | 1555 } else { |
| 514 | 1556 // This thread will define the class (even if earlier thread tried and had an error) |
| 1557 probe->set_definer(THREAD); | |
| 0 | 1558 } |
| 1559 } | |
| 1560 | |
| 1561 define_instance_class(k, THREAD); | |
| 1562 | |
| 1563 Handle linkage_exception = Handle(); // null handle | |
| 1564 | |
| 1565 // definer must notify any waiting threads | |
| 1566 { | |
| 1567 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 515 | 1568 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name_h, class_loader); |
| 0 | 1569 assert(probe != NULL, "DEFINE_CLASS placeholder lost?"); |
| 1570 if (probe != NULL) { | |
| 1571 if (HAS_PENDING_EXCEPTION) { | |
| 1572 linkage_exception = Handle(THREAD,PENDING_EXCEPTION); | |
| 1573 CLEAR_PENDING_EXCEPTION; | |
| 1574 } else { | |
| 1575 probe->set_instanceKlass(k()); | |
| 1576 } | |
| 1577 probe->set_definer(NULL); | |
| 1578 probe->remove_seen_thread(THREAD, PlaceholderTable::DEFINE_CLASS); | |
| 515 | 1579 placeholders()->find_and_remove(p_index, p_hash, name_h, class_loader, THREAD); |
| 0 | 1580 SystemDictionary_lock->notify_all(); |
| 1581 } | |
| 1582 } | |
| 1583 | |
| 1584 // Can't throw exception while holding lock due to rank ordering | |
| 1585 if (linkage_exception() != NULL) { | |
| 1586 THROW_OOP_(linkage_exception(), nh); // throws exception and returns | |
| 1587 } | |
| 1588 | |
| 1589 return k; | |
| 1590 } | |
| 1591 Handle SystemDictionary::compute_loader_lock_object(Handle class_loader, TRAPS) { | |
| 1592 // If class_loader is NULL we synchronize on _system_loader_lock_obj | |
| 1593 if (class_loader.is_null()) { | |
| 1594 return Handle(THREAD, _system_loader_lock_obj); | |
| 1595 } else { | |
| 1596 return class_loader; | |
| 1597 } | |
| 1598 } | |
| 1599 | |
| 1600 // This method is added to check how often we have to wait to grab loader | |
| 1601 // lock. The results are being recorded in the performance counters defined in | |
| 1602 // ClassLoader::_sync_systemLoaderLockContentionRate and | |
| 1603 // ClassLoader::_sync_nonSystemLoaderLockConteionRate. | |
| 1604 void SystemDictionary::check_loader_lock_contention(Handle loader_lock, TRAPS) { | |
| 1605 if (!UsePerfData) { | |
| 1606 return; | |
| 1607 } | |
| 1608 | |
| 1609 assert(!loader_lock.is_null(), "NULL lock object"); | |
| 1610 | |
| 1611 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader_lock) | |
| 1612 == ObjectSynchronizer::owner_other) { | |
| 1613 // contention will likely happen, so increment the corresponding | |
| 1614 // contention counter. | |
| 1615 if (loader_lock() == _system_loader_lock_obj) { | |
| 1616 ClassLoader::sync_systemLoaderLockContentionRate()->inc(); | |
| 1617 } else { | |
| 1618 ClassLoader::sync_nonSystemLoaderLockContentionRate()->inc(); | |
| 1619 } | |
| 1620 } | |
| 1621 } | |
| 1622 | |
| 1623 // ---------------------------------------------------------------------------- | |
| 1624 // Lookup | |
| 1625 | |
| 1626 klassOop SystemDictionary::find_class(int index, unsigned int hash, | |
| 1627 symbolHandle class_name, | |
| 1628 Handle class_loader) { | |
| 1629 assert_locked_or_safepoint(SystemDictionary_lock); | |
| 1630 assert (index == dictionary()->index_for(class_name, class_loader), | |
| 1631 "incorrect index?"); | |
| 1632 | |
| 1633 klassOop k = dictionary()->find_class(index, hash, class_name, class_loader); | |
| 1634 return k; | |
| 1635 } | |
| 1636 | |
| 1637 | |
| 1638 // Basic find on classes in the midst of being loaded | |
| 1639 symbolOop SystemDictionary::find_placeholder(int index, unsigned int hash, | |
| 1640 symbolHandle class_name, | |
| 1641 Handle class_loader) { | |
| 1642 assert_locked_or_safepoint(SystemDictionary_lock); | |
| 1643 | |
| 1644 return placeholders()->find_entry(index, hash, class_name, class_loader); | |
| 1645 } | |
| 1646 | |
| 1647 | |
| 1648 // Used for assertions and verification only | |
| 1649 oop SystemDictionary::find_class_or_placeholder(symbolHandle class_name, | |
| 1650 Handle class_loader) { | |
| 1651 #ifndef ASSERT | |
| 1652 guarantee(VerifyBeforeGC || | |
| 1653 VerifyDuringGC || | |
| 1654 VerifyBeforeExit || | |
| 1655 VerifyAfterGC, "too expensive"); | |
| 1656 #endif | |
| 1657 assert_locked_or_safepoint(SystemDictionary_lock); | |
| 1658 symbolOop class_name_ = class_name(); | |
| 1659 oop class_loader_ = class_loader(); | |
| 1660 | |
| 1661 // First look in the loaded class array | |
| 1662 unsigned int d_hash = dictionary()->compute_hash(class_name, class_loader); | |
| 1663 int d_index = dictionary()->hash_to_index(d_hash); | |
| 1664 oop lookup = find_class(d_index, d_hash, class_name, class_loader); | |
| 1665 | |
| 1666 if (lookup == NULL) { | |
| 1667 // Next try the placeholders | |
| 1668 unsigned int p_hash = placeholders()->compute_hash(class_name,class_loader); | |
| 1669 int p_index = placeholders()->hash_to_index(p_hash); | |
| 1670 lookup = find_placeholder(p_index, p_hash, class_name, class_loader); | |
| 1671 } | |
| 1672 | |
| 1673 return lookup; | |
| 1674 } | |
| 1675 | |
| 1676 | |
| 1677 // Get the next class in the diictionary. | |
| 1678 klassOop SystemDictionary::try_get_next_class() { | |
| 1679 return dictionary()->try_get_next_class(); | |
| 1680 } | |
| 1681 | |
| 1682 | |
| 1683 // ---------------------------------------------------------------------------- | |
| 1684 // Update hierachy. This is done before the new klass has been added to the SystemDictionary. The Recompile_lock | |
| 1685 // is held, to ensure that the compiler is not using the class hierachy, and that deoptimization will kick in | |
| 1686 // before a new class is used. | |
| 1687 | |
| 1688 void SystemDictionary::add_to_hierarchy(instanceKlassHandle k, TRAPS) { | |
| 1689 assert(k.not_null(), "just checking"); | |
| 1690 // Link into hierachy. Make sure the vtables are initialized before linking into | |
| 1691 k->append_to_sibling_list(); // add to superklass/sibling list | |
| 1692 k->process_interfaces(THREAD); // handle all "implements" declarations | |
| 1693 k->set_init_state(instanceKlass::loaded); | |
| 1694 // Now flush all code that depended on old class hierarchy. | |
| 1695 // Note: must be done *after* linking k into the hierarchy (was bug 12/9/97) | |
| 1696 // Also, first reinitialize vtable because it may have gotten out of synch | |
| 1697 // while the new class wasn't connected to the class hierarchy. | |
| 1698 Universe::flush_dependents_on(k); | |
| 1699 } | |
| 1700 | |
| 1701 | |
| 1702 // ---------------------------------------------------------------------------- | |
| 1703 // GC support | |
| 1704 | |
| 1705 // Following roots during mark-sweep is separated in two phases. | |
| 1706 // | |
| 1707 // The first phase follows preloaded classes and all other system | |
| 1708 // classes, since these will never get unloaded anyway. | |
| 1709 // | |
| 1710 // The second phase removes (unloads) unreachable classes from the | |
| 1711 // system dictionary and follows the remaining classes' contents. | |
| 1712 | |
| 1713 void SystemDictionary::always_strong_oops_do(OopClosure* blk) { | |
| 1714 // Follow preloaded classes/mirrors and system loader object | |
| 1715 blk->do_oop(&_java_system_loader); | |
| 1716 preloaded_oops_do(blk); | |
| 1717 always_strong_classes_do(blk); | |
| 1718 } | |
| 1719 | |
| 1720 | |
| 1721 void SystemDictionary::always_strong_classes_do(OopClosure* blk) { | |
| 1722 // Follow all system classes and temporary placeholders in dictionary | |
| 1723 dictionary()->always_strong_classes_do(blk); | |
| 1724 | |
| 1725 // Placeholders. These are *always* strong roots, as they | |
| 1726 // represent classes we're actively loading. | |
| 1727 placeholders_do(blk); | |
| 1728 | |
| 710 | 1729 // Visit extra methods |
| 1730 if (invoke_method_table() != NULL) | |
| 1731 invoke_method_table()->oops_do(blk); | |
| 1732 | |
| 0 | 1733 // Loader constraints. We must keep the symbolOop used in the name alive. |
| 1734 constraints()->always_strong_classes_do(blk); | |
| 1735 | |
| 1736 // Resolution errors keep the symbolOop for the error alive | |
| 1737 resolution_errors()->always_strong_classes_do(blk); | |
| 1738 } | |
| 1739 | |
| 1740 | |
| 1741 void SystemDictionary::placeholders_do(OopClosure* blk) { | |
| 1742 placeholders()->oops_do(blk); | |
| 1743 } | |
| 1744 | |
| 1745 | |
| 1746 bool SystemDictionary::do_unloading(BoolObjectClosure* is_alive) { | |
| 1747 bool result = dictionary()->do_unloading(is_alive); | |
| 1748 constraints()->purge_loader_constraints(is_alive); | |
| 1749 resolution_errors()->purge_resolution_errors(is_alive); | |
| 1750 return result; | |
| 1751 } | |
| 1752 | |
| 1753 | |
| 1754 // The mirrors are scanned by shared_oops_do() which is | |
| 1755 // not called by oops_do(). In order to process oops in | |
| 1756 // a necessary order, shared_oops_do() is call by | |
| 1757 // Universe::oops_do(). | |
| 1758 void SystemDictionary::oops_do(OopClosure* f) { | |
| 1759 // Adjust preloaded classes and system loader object | |
| 1760 f->do_oop(&_java_system_loader); | |
| 1761 preloaded_oops_do(f); | |
| 1762 | |
| 1763 lazily_loaded_oops_do(f); | |
| 1764 | |
| 1765 // Adjust dictionary | |
| 1766 dictionary()->oops_do(f); | |
| 1767 | |
| 710 | 1768 // Visit extra methods |
| 1769 if (invoke_method_table() != NULL) | |
| 1770 invoke_method_table()->oops_do(f); | |
| 1771 | |
| 0 | 1772 // Partially loaded classes |
| 1773 placeholders()->oops_do(f); | |
| 1774 | |
| 1775 // Adjust constraint table | |
| 1776 constraints()->oops_do(f); | |
| 1777 | |
| 1778 // Adjust resolution error table | |
| 1779 resolution_errors()->oops_do(f); | |
| 1780 } | |
| 1781 | |
| 1782 | |
| 1783 void SystemDictionary::preloaded_oops_do(OopClosure* f) { | |
|
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1784 f->do_oop((oop*) &wk_klass_name_limits[0]); |
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1785 f->do_oop((oop*) &wk_klass_name_limits[1]); |
| 0 | 1786 |
|
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1787 for (int k = (int)FIRST_WKID; k < (int)WKID_LIMIT; k++) { |
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1788 f->do_oop((oop*) &_well_known_klasses[k]); |
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1789 } |
| 0 | 1790 |
| 1791 { | |
| 1792 for (int i = 0; i < T_VOID+1; i++) { | |
| 1793 if (_box_klasses[i] != NULL) { | |
| 1794 assert(i >= T_BOOLEAN, "checking"); | |
| 1795 f->do_oop((oop*) &_box_klasses[i]); | |
| 1796 } | |
| 1797 } | |
| 1798 } | |
| 1799 | |
| 1800 // The basic type mirrors would have already been processed in | |
| 1801 // Universe::oops_do(), via a call to shared_oops_do(), so should | |
| 1802 // not be processed again. | |
| 1803 | |
| 1804 f->do_oop((oop*) &_system_loader_lock_obj); | |
| 1805 FilteredFieldsMap::klasses_oops_do(f); | |
| 1806 } | |
| 1807 | |
| 1808 void SystemDictionary::lazily_loaded_oops_do(OopClosure* f) { | |
| 1809 f->do_oop((oop*) &_abstract_ownable_synchronizer_klass); | |
| 1810 } | |
| 1811 | |
| 1812 // Just the classes from defining class loaders | |
| 1813 // Don't iterate over placeholders | |
| 1814 void SystemDictionary::classes_do(void f(klassOop)) { | |
| 1815 dictionary()->classes_do(f); | |
| 1816 } | |
| 1817 | |
| 1818 // Added for initialize_itable_for_klass | |
| 1819 // Just the classes from defining class loaders | |
| 1820 // Don't iterate over placeholders | |
| 1821 void SystemDictionary::classes_do(void f(klassOop, TRAPS), TRAPS) { | |
| 1822 dictionary()->classes_do(f, CHECK); | |
| 1823 } | |
| 1824 | |
| 1825 // All classes, and their class loaders | |
| 1826 // Don't iterate over placeholders | |
| 1827 void SystemDictionary::classes_do(void f(klassOop, oop)) { | |
| 1828 dictionary()->classes_do(f); | |
| 1829 } | |
| 1830 | |
| 1831 // All classes, and their class loaders | |
| 1832 // (added for helpers that use HandleMarks and ResourceMarks) | |
| 1833 // Don't iterate over placeholders | |
| 1834 void SystemDictionary::classes_do(void f(klassOop, oop, TRAPS), TRAPS) { | |
| 1835 dictionary()->classes_do(f, CHECK); | |
| 1836 } | |
| 1837 | |
| 1838 void SystemDictionary::placeholders_do(void f(symbolOop, oop)) { | |
| 1839 placeholders()->entries_do(f); | |
| 1840 } | |
| 1841 | |
| 1842 void SystemDictionary::methods_do(void f(methodOop)) { | |
| 1843 dictionary()->methods_do(f); | |
| 710 | 1844 if (invoke_method_table() != NULL) |
| 1845 invoke_method_table()->methods_do(f); | |
| 0 | 1846 } |
| 1847 | |
| 1848 // ---------------------------------------------------------------------------- | |
| 1849 // Lazily load klasses | |
| 1850 | |
| 1851 void SystemDictionary::load_abstract_ownable_synchronizer_klass(TRAPS) { | |
| 1852 assert(JDK_Version::is_gte_jdk16x_version(), "Must be JDK 1.6 or later"); | |
| 1853 | |
| 1854 // if multiple threads calling this function, only one thread will load | |
| 1855 // the class. The other threads will find the loaded version once the | |
| 1856 // class is loaded. | |
| 1857 klassOop aos = _abstract_ownable_synchronizer_klass; | |
| 1858 if (aos == NULL) { | |
| 1859 klassOop k = resolve_or_fail(vmSymbolHandles::java_util_concurrent_locks_AbstractOwnableSynchronizer(), true, CHECK); | |
| 1860 // Force a fence to prevent any read before the write completes | |
| 1861 OrderAccess::fence(); | |
| 1862 _abstract_ownable_synchronizer_klass = k; | |
| 1863 } | |
| 1864 } | |
| 1865 | |
| 1866 // ---------------------------------------------------------------------------- | |
| 1867 // Initialization | |
| 1868 | |
| 1869 void SystemDictionary::initialize(TRAPS) { | |
| 1870 // Allocate arrays | |
| 1871 assert(dictionary() == NULL, | |
| 1872 "SystemDictionary should only be initialized once"); | |
| 1873 _dictionary = new Dictionary(_nof_buckets); | |
| 1874 _placeholders = new PlaceholderTable(_nof_buckets); | |
| 1875 _number_of_modifications = 0; | |
| 1876 _loader_constraints = new LoaderConstraintTable(_loader_constraint_size); | |
| 1877 _resolution_errors = new ResolutionErrorTable(_resolution_error_size); | |
| 710 | 1878 // _invoke_method_table is allocated lazily in find_method_handle_invoke() |
| 0 | 1879 |
| 1880 // Allocate private object used as system class loader lock | |
| 1881 _system_loader_lock_obj = oopFactory::new_system_objArray(0, CHECK); | |
| 1882 // Initialize basic classes | |
| 1883 initialize_preloaded_classes(CHECK); | |
| 1884 } | |
| 1885 | |
|
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1886 // Compact table of directions on the initialization of klasses: |
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1887 static const short wk_init_info[] = { |
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1888 #define WK_KLASS_INIT_INFO(name, symbol, option) \ |
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1889 ( ((int)vmSymbols::VM_SYMBOL_ENUM_NAME(symbol) \ |
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1890 << SystemDictionary::CEIL_LG_OPTION_LIMIT) \ |
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1891 | (int)SystemDictionary::option ), |
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1892 WK_KLASSES_DO(WK_KLASS_INIT_INFO) |
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1893 #undef WK_KLASS_INIT_INFO |
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1894 0 |
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1895 }; |
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1896 |
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1897 bool SystemDictionary::initialize_wk_klass(WKID id, int init_opt, TRAPS) { |
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1898 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1899 int info = wk_init_info[id - FIRST_WKID]; |
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1900 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1901 symbolHandle symbol = vmSymbolHandles::symbol_handle_at((vmSymbols::SID)sid); |
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1902 klassOop* klassp = &_well_known_klasses[id]; |
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1903 bool must_load = (init_opt < SystemDictionary::Opt); |
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1904 bool try_load = true; |
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1905 if (init_opt == SystemDictionary::Opt_Kernel) { |
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1906 #ifndef KERNEL |
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1907 try_load = false; |
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1908 #endif //KERNEL |
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1909 } |
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1910 if ((*klassp) == NULL && try_load) { |
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1911 if (must_load) { |
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1912 (*klassp) = resolve_or_fail(symbol, true, CHECK_0); // load required class |
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1913 } else { |
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1914 (*klassp) = resolve_or_null(symbol, CHECK_0); // load optional klass |
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1915 } |
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1916 } |
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1917 return ((*klassp) != NULL); |
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1918 } |
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1919 |
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1920 void SystemDictionary::initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS) { |
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1921 assert((int)start_id <= (int)limit_id, "IDs are out of order!"); |
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1922 for (int id = (int)start_id; id < (int)limit_id; id++) { |
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1923 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1924 int info = wk_init_info[id - FIRST_WKID]; |
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1925 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1926 int opt = (info & right_n_bits(CEIL_LG_OPTION_LIMIT)); |
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1927 |
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1928 initialize_wk_klass((WKID)id, opt, CHECK); |
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1929 |
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1930 // Update limits, so find_well_known_klass can be very fast: |
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1931 symbolOop s = vmSymbols::symbol_at((vmSymbols::SID)sid); |
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1932 if (wk_klass_name_limits[1] == NULL) { |
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1933 wk_klass_name_limits[0] = wk_klass_name_limits[1] = s; |
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1934 } else if (wk_klass_name_limits[1] < s) { |
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1935 wk_klass_name_limits[1] = s; |
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1936 } else if (wk_klass_name_limits[0] > s) { |
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1937 wk_klass_name_limits[0] = s; |
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1938 } |
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1939 } |
| 710 | 1940 |
| 1941 // move the starting value forward to the limit: | |
| 1942 start_id = limit_id; | |
|
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1943 } |
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1944 |
| 0 | 1945 |
| 1946 void SystemDictionary::initialize_preloaded_classes(TRAPS) { | |
| 1142 | 1947 assert(WK_KLASS(Object_klass) == NULL, "preloaded classes should only be initialized once"); |
| 0 | 1948 // Preload commonly used klasses |
|
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1949 WKID scan = FIRST_WKID; |
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1950 // first do Object, String, Class |
| 1142 | 1951 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Class_klass), scan, CHECK); |
|
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1952 |
| 1142 | 1953 debug_only(instanceKlass::verify_class_klass_nonstatic_oop_maps(WK_KLASS(Class_klass))); |
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1954 |
| 0 | 1955 // Fixup mirrors for classes loaded before java.lang.Class. |
| 1956 // These calls iterate over the objects currently in the perm gen | |
| 1957 // so calling them at this point is matters (not before when there | |
| 1958 // are fewer objects and not later after there are more objects | |
| 1959 // in the perm gen. | |
| 1960 Universe::initialize_basic_type_mirrors(CHECK); | |
| 1961 Universe::fixup_mirrors(CHECK); | |
| 1962 | |
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1963 // do a bunch more: |
| 1142 | 1964 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Reference_klass), scan, CHECK); |
| 0 | 1965 |
| 1966 // Preload ref klasses and set reference types | |
| 1142 | 1967 instanceKlass::cast(WK_KLASS(Reference_klass))->set_reference_type(REF_OTHER); |
| 1968 instanceRefKlass::update_nonstatic_oop_maps(WK_KLASS(Reference_klass)); | |
| 0 | 1969 |
| 1142 | 1970 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(PhantomReference_klass), scan, CHECK); |
| 1971 instanceKlass::cast(WK_KLASS(SoftReference_klass))->set_reference_type(REF_SOFT); | |
| 1972 instanceKlass::cast(WK_KLASS(WeakReference_klass))->set_reference_type(REF_WEAK); | |
| 1973 instanceKlass::cast(WK_KLASS(FinalReference_klass))->set_reference_type(REF_FINAL); | |
| 1974 instanceKlass::cast(WK_KLASS(PhantomReference_klass))->set_reference_type(REF_PHANTOM); | |
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1975 |
| 710 | 1976 WKID meth_group_start = WK_KLASS_ENUM_NAME(MethodHandle_klass); |
| 1977 WKID meth_group_end = WK_KLASS_ENUM_NAME(WrongMethodTypeException_klass); | |
| 1978 initialize_wk_klasses_until(meth_group_start, scan, CHECK); | |
| 1979 if (EnableMethodHandles) { | |
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1980 initialize_wk_klasses_through(meth_group_end, scan, CHECK); |
| 710 | 1981 } |
| 1982 if (_well_known_klasses[meth_group_start] == NULL) { | |
| 1983 // Skip the rest of the method handle classes, if MethodHandle is not loaded. | |
| 1984 scan = WKID(meth_group_end+1); | |
| 1985 } | |
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1986 WKID indy_group_start = WK_KLASS_ENUM_NAME(Linkage_klass); |
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1987 WKID indy_group_end = WK_KLASS_ENUM_NAME(InvokeDynamic_klass); |
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1988 initialize_wk_klasses_until(indy_group_start, scan, CHECK); |
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1989 if (EnableInvokeDynamic) { |
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1990 initialize_wk_klasses_through(indy_group_end, scan, CHECK); |
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1991 } |
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1992 if (_well_known_klasses[indy_group_start] == NULL) { |
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1993 // Skip the rest of the dynamic typing classes, if Linkage is not loaded. |
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1994 scan = WKID(indy_group_end+1); |
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1995 } |
| 710 | 1996 |
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1997 initialize_wk_klasses_until(WKID_LIMIT, scan, CHECK); |
| 0 | 1998 |
| 1142 | 1999 _box_klasses[T_BOOLEAN] = WK_KLASS(Boolean_klass); |
| 2000 _box_klasses[T_CHAR] = WK_KLASS(Character_klass); | |
| 2001 _box_klasses[T_FLOAT] = WK_KLASS(Float_klass); | |
| 2002 _box_klasses[T_DOUBLE] = WK_KLASS(Double_klass); | |
| 2003 _box_klasses[T_BYTE] = WK_KLASS(Byte_klass); | |
| 2004 _box_klasses[T_SHORT] = WK_KLASS(Short_klass); | |
| 2005 _box_klasses[T_INT] = WK_KLASS(Integer_klass); | |
| 2006 _box_klasses[T_LONG] = WK_KLASS(Long_klass); | |
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2007 //_box_klasses[T_OBJECT] = WK_KLASS(object_klass); |
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2008 //_box_klasses[T_ARRAY] = WK_KLASS(object_klass); |
| 0 | 2009 |
| 2010 #ifdef KERNEL | |
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2011 if (sun_jkernel_DownloadManager_klass() == NULL) { |
| 0 | 2012 warning("Cannot find sun/jkernel/DownloadManager"); |
| 2013 } | |
| 2014 #endif // KERNEL | |
| 514 | 2015 |
| 0 | 2016 { // Compute whether we should use loadClass or loadClassInternal when loading classes. |
| 1142 | 2017 methodOop method = instanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::loadClassInternal_name(), vmSymbols::string_class_signature()); |
| 0 | 2018 _has_loadClassInternal = (method != NULL); |
| 2019 } | |
| 2020 { // Compute whether we should use checkPackageAccess or NOT | |
| 1142 | 2021 methodOop method = instanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::checkPackageAccess_name(), vmSymbols::class_protectiondomain_signature()); |
| 0 | 2022 _has_checkPackageAccess = (method != NULL); |
| 2023 } | |
| 2024 } | |
| 2025 | |
| 2026 // Tells if a given klass is a box (wrapper class, such as java.lang.Integer). | |
| 2027 // If so, returns the basic type it holds. If not, returns T_OBJECT. | |
| 2028 BasicType SystemDictionary::box_klass_type(klassOop k) { | |
| 2029 assert(k != NULL, ""); | |
| 2030 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { | |
| 2031 if (_box_klasses[i] == k) | |
| 2032 return (BasicType)i; | |
| 2033 } | |
| 2034 return T_OBJECT; | |
| 2035 } | |
| 2036 | |
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2037 KlassHandle SystemDictionaryHandles::box_klass(BasicType t) { |
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2038 if (t >= T_BOOLEAN && t <= T_VOID) |
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2039 return KlassHandle(&SystemDictionary::_box_klasses[t], true); |
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2040 else |
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2041 return KlassHandle(); |
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2042 } |
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2043 |
| 0 | 2044 // Constraints on class loaders. The details of the algorithm can be |
| 2045 // found in the OOPSLA'98 paper "Dynamic Class Loading in the Java | |
| 2046 // Virtual Machine" by Sheng Liang and Gilad Bracha. The basic idea is | |
| 2047 // that the system dictionary needs to maintain a set of contraints that | |
| 2048 // must be satisfied by all classes in the dictionary. | |
| 2049 // if defining is true, then LinkageError if already in systemDictionary | |
| 2050 // if initiating loader, then ok if instanceKlass matches existing entry | |
| 2051 | |
| 2052 void SystemDictionary::check_constraints(int d_index, unsigned int d_hash, | |
| 2053 instanceKlassHandle k, | |
| 2054 Handle class_loader, bool defining, | |
| 2055 TRAPS) { | |
| 2056 const char *linkage_error = NULL; | |
| 2057 { | |
| 2058 symbolHandle name (THREAD, k->name()); | |
| 2059 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 2060 | |
| 2061 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 2062 if (check != (klassOop)NULL) { | |
| 2063 // if different instanceKlass - duplicate class definition, | |
| 2064 // else - ok, class loaded by a different thread in parallel, | |
| 2065 // we should only have found it if it was done loading and ok to use | |
| 2066 // system dictionary only holds instance classes, placeholders | |
| 2067 // also holds array classes | |
| 2068 | |
| 2069 assert(check->klass_part()->oop_is_instance(), "noninstance in systemdictionary"); | |
| 2070 if ((defining == true) || (k() != check)) { | |
| 2071 linkage_error = "loader (instance of %s): attempted duplicate class " | |
| 2072 "definition for name: \"%s\""; | |
| 2073 } else { | |
| 2074 return; | |
| 2075 } | |
| 2076 } | |
| 2077 | |
| 2078 #ifdef ASSERT | |
| 2079 unsigned int p_hash = placeholders()->compute_hash(name, class_loader); | |
| 2080 int p_index = placeholders()->hash_to_index(p_hash); | |
| 2081 symbolOop ph_check = find_placeholder(p_index, p_hash, name, class_loader); | |
| 2082 assert(ph_check == NULL || ph_check == name(), "invalid symbol"); | |
| 2083 #endif | |
| 2084 | |
| 2085 if (linkage_error == NULL) { | |
| 2086 if (constraints()->check_or_update(k, class_loader, name) == false) { | |
| 2087 linkage_error = "loader constraint violation: loader (instance of %s)" | |
| 2088 " previously initiated loading for a different type with name \"%s\""; | |
| 2089 } | |
| 2090 } | |
| 2091 } | |
| 2092 | |
| 2093 // Throw error now if needed (cannot throw while holding | |
| 2094 // SystemDictionary_lock because of rank ordering) | |
| 2095 | |
| 2096 if (linkage_error) { | |
| 2097 ResourceMark rm(THREAD); | |
| 2098 const char* class_loader_name = loader_name(class_loader()); | |
| 2099 char* type_name = k->name()->as_C_string(); | |
| 2100 size_t buflen = strlen(linkage_error) + strlen(class_loader_name) + | |
| 2101 strlen(type_name); | |
| 2102 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
| 2103 jio_snprintf(buf, buflen, linkage_error, class_loader_name, type_name); | |
| 2104 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); | |
| 2105 } | |
| 2106 } | |
| 2107 | |
| 2108 | |
| 2109 // Update system dictionary - done after check_constraint and add_to_hierachy | |
| 2110 // have been called. | |
| 2111 void SystemDictionary::update_dictionary(int d_index, unsigned int d_hash, | |
| 2112 int p_index, unsigned int p_hash, | |
| 2113 instanceKlassHandle k, | |
| 2114 Handle class_loader, | |
| 2115 TRAPS) { | |
| 2116 // Compile_lock prevents systemDictionary updates during compilations | |
| 2117 assert_locked_or_safepoint(Compile_lock); | |
| 2118 symbolHandle name (THREAD, k->name()); | |
| 2119 | |
| 2120 { | |
| 2121 MutexLocker mu1(SystemDictionary_lock, THREAD); | |
| 2122 | |
| 2123 // See whether biased locking is enabled and if so set it for this | |
| 2124 // klass. | |
| 2125 // Note that this must be done past the last potential blocking | |
| 2126 // point / safepoint. We enable biased locking lazily using a | |
| 2127 // VM_Operation to iterate the SystemDictionary and installing the | |
| 2128 // biasable mark word into each instanceKlass's prototype header. | |
| 2129 // To avoid race conditions where we accidentally miss enabling the | |
| 2130 // optimization for one class in the process of being added to the | |
| 2131 // dictionary, we must not safepoint after the test of | |
| 2132 // BiasedLocking::enabled(). | |
| 2133 if (UseBiasedLocking && BiasedLocking::enabled()) { | |
| 2134 // Set biased locking bit for all loaded classes; it will be | |
| 2135 // cleared if revocation occurs too often for this type | |
| 2136 // NOTE that we must only do this when the class is initally | |
| 2137 // defined, not each time it is referenced from a new class loader | |
| 2138 if (k->class_loader() == class_loader()) { | |
| 2139 k->set_prototype_header(markOopDesc::biased_locking_prototype()); | |
| 2140 } | |
| 2141 } | |
| 2142 | |
| 2143 // Check for a placeholder. If there, remove it and make a | |
| 2144 // new system dictionary entry. | |
| 2145 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
| 2146 klassOop sd_check = find_class(d_index, d_hash, name, class_loader); | |
| 2147 if (sd_check == NULL) { | |
| 2148 dictionary()->add_klass(name, class_loader, k); | |
| 2149 notice_modification(); | |
| 2150 } | |
| 2151 #ifdef ASSERT | |
| 2152 sd_check = find_class(d_index, d_hash, name, class_loader); | |
| 2153 assert (sd_check != NULL, "should have entry in system dictionary"); | |
| 2154 // Changed to allow PH to remain to complete class circularity checking | |
| 2155 // while only one thread can define a class at one time, multiple | |
| 2156 // classes can resolve the superclass for a class at one time, | |
| 2157 // and the placeholder is used to track that | |
| 2158 // symbolOop ph_check = find_placeholder(p_index, p_hash, name, class_loader); | |
| 2159 // assert (ph_check == NULL, "should not have a placeholder entry"); | |
| 2160 #endif | |
| 2161 SystemDictionary_lock->notify_all(); | |
| 2162 } | |
| 2163 } | |
| 2164 | |
| 2165 | |
| 2166 klassOop SystemDictionary::find_constrained_instance_or_array_klass( | |
| 2167 symbolHandle class_name, Handle class_loader, TRAPS) { | |
| 2168 | |
| 2169 // First see if it has been loaded directly. | |
| 2170 // Force the protection domain to be null. (This removes protection checks.) | |
| 2171 Handle no_protection_domain; | |
| 2172 klassOop klass = find_instance_or_array_klass(class_name, class_loader, | |
| 2173 no_protection_domain, CHECK_NULL); | |
| 2174 if (klass != NULL) | |
| 2175 return klass; | |
| 2176 | |
| 2177 // Now look to see if it has been loaded elsewhere, and is subject to | |
| 2178 // a loader constraint that would require this loader to return the | |
| 2179 // klass that is already loaded. | |
| 2180 if (FieldType::is_array(class_name())) { | |
| 1336 | 2181 // For array classes, their klassOops are not kept in the |
| 2182 // constraint table. The element klassOops are. | |
| 0 | 2183 jint dimension; |
| 2184 symbolOop object_key; | |
| 2185 BasicType t = FieldType::get_array_info(class_name(), &dimension, | |
| 2186 &object_key, CHECK_(NULL)); | |
| 2187 if (t != T_OBJECT) { | |
| 2188 klass = Universe::typeArrayKlassObj(t); | |
| 2189 } else { | |
| 2190 symbolHandle elem_name(THREAD, object_key); | |
| 2191 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 1336 | 2192 klass = constraints()->find_constrained_klass(elem_name, class_loader); |
| 0 | 2193 } |
| 1336 | 2194 // If element class already loaded, allocate array klass |
| 0 | 2195 if (klass != NULL) { |
| 2196 klass = Klass::cast(klass)->array_klass_or_null(dimension); | |
| 2197 } | |
| 2198 } else { | |
| 2199 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 2200 // Non-array classes are easy: simply check the constraint table. | |
| 2201 klass = constraints()->find_constrained_klass(class_name, class_loader); | |
| 2202 } | |
| 2203 | |
| 2204 return klass; | |
| 2205 } | |
| 2206 | |
| 2207 | |
| 2208 bool SystemDictionary::add_loader_constraint(symbolHandle class_name, | |
| 2209 Handle class_loader1, | |
| 2210 Handle class_loader2, | |
| 2211 Thread* THREAD) { | |
| 1336 | 2212 symbolHandle constraint_name; |
| 2213 if (!FieldType::is_array(class_name())) { | |
| 2214 constraint_name = class_name; | |
| 2215 } else { | |
| 2216 // For array classes, their klassOops are not kept in the | |
| 2217 // constraint table. The element classes are. | |
| 2218 jint dimension; | |
| 2219 symbolOop object_key; | |
| 2220 BasicType t = FieldType::get_array_info(class_name(), &dimension, | |
| 2221 &object_key, CHECK_(false)); | |
| 2222 // primitive types always pass | |
| 2223 if (t != T_OBJECT) { | |
| 2224 return true; | |
| 2225 } else { | |
| 2226 constraint_name = symbolHandle(THREAD, object_key); | |
| 2227 } | |
| 2228 } | |
| 2229 unsigned int d_hash1 = dictionary()->compute_hash(constraint_name, class_loader1); | |
| 0 | 2230 int d_index1 = dictionary()->hash_to_index(d_hash1); |
| 2231 | |
| 1336 | 2232 unsigned int d_hash2 = dictionary()->compute_hash(constraint_name, class_loader2); |
| 0 | 2233 int d_index2 = dictionary()->hash_to_index(d_hash2); |
| 2234 { | |
| 1336 | 2235 MutexLocker mu_s(SystemDictionary_lock, THREAD); |
| 0 | 2236 |
| 1336 | 2237 // Better never do a GC while we're holding these oops |
| 2238 No_Safepoint_Verifier nosafepoint; | |
| 0 | 2239 |
| 1336 | 2240 klassOop klass1 = find_class(d_index1, d_hash1, constraint_name, class_loader1); |
| 2241 klassOop klass2 = find_class(d_index2, d_hash2, constraint_name, class_loader2); | |
| 2242 return constraints()->add_entry(constraint_name, klass1, class_loader1, | |
| 2243 klass2, class_loader2); | |
| 0 | 2244 } |
| 2245 } | |
| 2246 | |
| 2247 // Add entry to resolution error table to record the error when the first | |
| 2248 // attempt to resolve a reference to a class has failed. | |
| 2249 void SystemDictionary::add_resolution_error(constantPoolHandle pool, int which, symbolHandle error) { | |
| 2250 unsigned int hash = resolution_errors()->compute_hash(pool, which); | |
| 2251 int index = resolution_errors()->hash_to_index(hash); | |
| 2252 { | |
| 2253 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
| 2254 resolution_errors()->add_entry(index, hash, pool, which, error); | |
| 2255 } | |
| 2256 } | |
| 2257 | |
| 2258 // Lookup resolution error table. Returns error if found, otherwise NULL. | |
| 2259 symbolOop SystemDictionary::find_resolution_error(constantPoolHandle pool, int which) { | |
| 2260 unsigned int hash = resolution_errors()->compute_hash(pool, which); | |
| 2261 int index = resolution_errors()->hash_to_index(hash); | |
| 2262 { | |
| 2263 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
| 2264 ResolutionErrorEntry* entry = resolution_errors()->find_entry(index, hash, pool, which); | |
| 2265 return (entry != NULL) ? entry->error() : (symbolOop)NULL; | |
| 2266 } | |
| 2267 } | |
| 2268 | |
| 2269 | |
|
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2270 // Signature constraints ensure that callers and callees agree about |
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2271 // the meaning of type names in their signatures. This routine is the |
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2272 // intake for constraints. It collects them from several places: |
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2273 // |
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2274 // * LinkResolver::resolve_method (if check_access is true) requires |
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2275 // that the resolving class (the caller) and the defining class of |
|
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2276 // the resolved method (the callee) agree on each type in the |
|
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2277 // method's signature. |
|
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2278 // |
|
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2279 // * LinkResolver::resolve_interface_method performs exactly the same |
|
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2280 // checks. |
|
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|
2281 // |
|
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2282 // * LinkResolver::resolve_field requires that the constant pool |
|
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2283 // attempting to link to a field agree with the field's defining |
|
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2284 // class about the type of the field signature. |
|
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2285 // |
|
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2286 // * klassVtable::initialize_vtable requires that, when a class |
|
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2287 // overrides a vtable entry allocated by a superclass, that the |
|
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2288 // overriding method (i.e., the callee) agree with the superclass |
|
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2289 // on each type in the method's signature. |
|
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2290 // |
|
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2291 // * klassItable::initialize_itable requires that, when a class fills |
|
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2292 // in its itables, for each non-abstract method installed in an |
|
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2293 // itable, the method (i.e., the callee) agree with the interface |
|
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2294 // on each type in the method's signature. |
|
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2295 // |
|
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2296 // All those methods have a boolean (check_access, checkconstraints) |
|
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|
2297 // which turns off the checks. This is used from specialized contexts |
|
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2298 // such as bootstrapping, dumping, and debugging. |
|
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|
2299 // |
|
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2300 // No direct constraint is placed between the class and its |
|
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|
2301 // supertypes. Constraints are only placed along linked relations |
|
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2302 // between callers and callees. When a method overrides or implements |
|
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2303 // an abstract method in a supertype (superclass or interface), the |
|
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2304 // constraints are placed as if the supertype were the caller to the |
|
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|
2305 // overriding method. (This works well, since callers to the |
|
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2306 // supertype have already established agreement between themselves and |
|
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|
2307 // the supertype.) As a result of all this, a class can disagree with |
|
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2308 // its supertype about the meaning of a type name, as long as that |
|
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|
2309 // class neither calls a relevant method of the supertype, nor is |
|
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|
2310 // called (perhaps via an override) from the supertype. |
|
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|
2311 // |
|
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|
2312 // |
|
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|
2313 // SystemDictionary::check_signature_loaders(sig, l1, l2) |
|
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|
2314 // |
| 0 | 2315 // Make sure all class components (including arrays) in the given |
| 2316 // signature will be resolved to the same class in both loaders. | |
| 2317 // Returns the name of the type that failed a loader constraint check, or | |
| 2318 // NULL if no constraint failed. The returned C string needs cleaning up | |
|
665
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|
2319 // with a ResourceMark in the caller. No exception except OOME is thrown. |
| 1336 | 2320 // Arrays are not added to the loader constraint table, their elements are. |
| 0 | 2321 char* SystemDictionary::check_signature_loaders(symbolHandle signature, |
| 2322 Handle loader1, Handle loader2, | |
| 2323 bool is_method, TRAPS) { | |
| 2324 // Nothing to do if loaders are the same. | |
| 2325 if (loader1() == loader2()) { | |
| 2326 return NULL; | |
| 2327 } | |
| 2328 | |
| 2329 SignatureStream sig_strm(signature, is_method); | |
| 2330 while (!sig_strm.is_done()) { | |
| 2331 if (sig_strm.is_object()) { | |
| 2332 symbolOop s = sig_strm.as_symbol(CHECK_NULL); | |
| 2333 symbolHandle sig (THREAD, s); | |
| 2334 if (!add_loader_constraint(sig, loader1, loader2, THREAD)) { | |
| 2335 return sig()->as_C_string(); | |
| 2336 } | |
| 2337 } | |
| 2338 sig_strm.next(); | |
| 2339 } | |
| 2340 return NULL; | |
| 2341 } | |
| 2342 | |
| 2343 | |
|
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|
2344 methodOop SystemDictionary::find_method_handle_invoke(symbolHandle name, |
|
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|
2345 symbolHandle signature, |
| 710 | 2346 Handle class_loader, |
| 2347 Handle protection_domain, | |
| 2348 TRAPS) { | |
| 2349 if (!EnableMethodHandles) return NULL; | |
| 2350 assert(class_loader.is_null() && protection_domain.is_null(), | |
| 2351 "cannot load specialized versions of MethodHandle.invoke"); | |
| 2352 if (invoke_method_table() == NULL) { | |
| 2353 // create this side table lazily | |
| 2354 _invoke_method_table = new SymbolPropertyTable(_invoke_method_size); | |
| 2355 } | |
|
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|
2356 vmSymbols::SID name_id = vmSymbols::find_sid(name()); |
|
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|
2357 assert(name_id != vmSymbols::NO_SID, "must be a known name"); |
|
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|
2358 unsigned int hash = invoke_method_table()->compute_hash(signature, name_id); |
| 710 | 2359 int index = invoke_method_table()->hash_to_index(hash); |
|
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|
2360 SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, name_id); |
| 710 | 2361 if (spe == NULL || spe->property_oop() == NULL) { |
| 2362 // Must create lots of stuff here, but outside of the SystemDictionary lock. | |
|
1135
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|
2363 if (THREAD->is_Compiler_thread()) |
|
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|
2364 return NULL; // do not attempt from within compiler |
|
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|
2365 Handle mt = find_method_handle_type(signature(), |
|
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|
2366 class_loader, protection_domain, |
|
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|
2367 CHECK_NULL); |
| 710 | 2368 KlassHandle mh_klass = SystemDictionaryHandles::MethodHandle_klass(); |
|
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|
2369 methodHandle m = methodOopDesc::make_invoke_method(mh_klass, name, signature, |
| 710 | 2370 mt, CHECK_NULL); |
| 2371 // Now grab the lock. We might have to throw away the new method, | |
| 2372 // if a racing thread has managed to install one at the same time. | |
| 2373 { | |
| 2374 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
|
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|
2375 spe = invoke_method_table()->find_entry(index, hash, signature, name_id); |
| 710 | 2376 if (spe == NULL) |
|
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|
2377 spe = invoke_method_table()->add_entry(index, hash, signature, name_id); |
| 710 | 2378 if (spe->property_oop() == NULL) |
| 2379 spe->set_property_oop(m()); | |
| 2380 } | |
| 2381 } | |
| 2382 methodOop m = (methodOop) spe->property_oop(); | |
| 2383 assert(m->is_method(), ""); | |
| 2384 return m; | |
| 2385 } | |
| 2386 | |
| 2387 // Ask Java code to find or construct a java.dyn.MethodType for the given | |
| 2388 // signature, as interpreted relative to the given class loader. | |
| 2389 // Because of class loader constraints, all method handle usage must be | |
| 2390 // consistent with this loader. | |
|
1507
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|
2391 Handle SystemDictionary::find_method_handle_type(symbolHandle signature, |
|
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|
2392 Handle class_loader, |
|
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diff
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|
2393 Handle protection_domain, |
|
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|
2394 TRAPS) { |
| 710 | 2395 Handle empty; |
| 2396 int npts = ArgumentCount(signature()).size(); | |
| 1142 | 2397 objArrayHandle pts = oopFactory::new_objArray(SystemDictionary::Class_klass(), npts, CHECK_(empty)); |
| 710 | 2398 int arg = 0; |
| 2399 Handle rt; // the return type from the signature | |
| 2400 for (SignatureStream ss(signature()); !ss.is_done(); ss.next()) { | |
| 2401 oop mirror; | |
| 2402 if (!ss.is_object()) { | |
| 2403 mirror = Universe::java_mirror(ss.type()); | |
| 2404 } else { | |
| 2405 symbolOop name_oop = ss.as_symbol(CHECK_(empty)); | |
| 2406 symbolHandle name(THREAD, name_oop); | |
| 2407 klassOop klass = resolve_or_fail(name, | |
| 2408 class_loader, protection_domain, | |
| 2409 true, CHECK_(empty)); | |
| 2410 mirror = Klass::cast(klass)->java_mirror(); | |
| 2411 } | |
| 2412 if (ss.at_return_type()) | |
| 2413 rt = Handle(THREAD, mirror); | |
| 2414 else | |
| 2415 pts->obj_at_put(arg++, mirror); | |
| 2416 } | |
| 2417 assert(arg == npts, ""); | |
| 2418 | |
|
1507
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diff
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|
2419 // call sun.dyn.MethodHandleNatives::findMethodType(Class rt, Class[] pts) -> MethodType |
| 710 | 2420 JavaCallArguments args(Handle(THREAD, rt())); |
| 2421 args.push_oop(pts()); | |
| 2422 JavaValue result(T_OBJECT); | |
| 2423 JavaCalls::call_static(&result, | |
|
1507
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diff
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|
2424 SystemDictionary::MethodHandleNatives_klass(), |
|
cd5dbf694d45
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diff
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|
2425 vmSymbols::findMethodHandleType_name(), |
|
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1339
diff
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|
2426 vmSymbols::findMethodHandleType_signature(), |
| 710 | 2427 &args, CHECK_(empty)); |
| 2428 return Handle(THREAD, (oop) result.get_jobject()); | |
| 2429 } | |
| 2430 | |
| 2431 | |
|
726
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diff
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|
2432 // Ask Java code to find or construct a java.dyn.CallSite for the given |
|
be93aad57795
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jrose
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diff
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|
2433 // name and signature, as interpreted relative to the given class loader. |
|
1507
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diff
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|
2434 Handle SystemDictionary::make_dynamic_call_site(Handle bootstrap_method, |
|
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jrose
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diff
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|
2435 symbolHandle name, |
|
cd5dbf694d45
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diff
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|
2436 methodHandle signature_invoker, |
|
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diff
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|
2437 Handle info, |
|
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1339
diff
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|
2438 methodHandle caller_method, |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
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diff
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|
2439 int caller_bci, |
|
be93aad57795
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|
2440 TRAPS) { |
|
be93aad57795
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diff
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|
2441 Handle empty; |
|
1507
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|
2442 Handle caller_mname = MethodHandles::new_MemberName(CHECK_(empty)); |
|
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|
2443 MethodHandles::init_MemberName(caller_mname(), caller_method()); |
|
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diff
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|
2444 |
|
cd5dbf694d45
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jrose
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1339
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|
2445 // call sun.dyn.MethodHandleNatives::makeDynamicCallSite(bootm, name, mtype, info, caller_mname, caller_pos) |
|
726
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|
2446 oop name_str_oop = StringTable::intern(name(), CHECK_(empty)); // not a handle! |
|
1507
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jrose
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diff
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|
2447 JavaCallArguments args(Handle(THREAD, bootstrap_method())); |
|
726
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diff
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|
2448 args.push_oop(name_str_oop); |
|
1507
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diff
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|
2449 args.push_oop(signature_invoker->method_handle_type()); |
|
cd5dbf694d45
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jrose
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diff
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|
2450 args.push_oop(info()); |
|
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diff
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|
2451 args.push_oop(caller_mname()); |
|
726
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jrose
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diff
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|
2452 args.push_int(caller_bci); |
|
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|
2453 JavaValue result(T_OBJECT); |
|
be93aad57795
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|
2454 JavaCalls::call_static(&result, |
|
1507
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1339
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|
2455 SystemDictionary::MethodHandleNatives_klass(), |
|
cd5dbf694d45
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|
2456 vmSymbols::makeDynamicCallSite_name(), |
|
cd5dbf694d45
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1339
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|
2457 vmSymbols::makeDynamicCallSite_signature(), |
|
726
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|
2458 &args, CHECK_(empty)); |
|
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jrose
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diff
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|
2459 oop call_site_oop = (oop) result.get_jobject(); |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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875
diff
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|
2460 assert(call_site_oop->is_oop() |
|
1059
389049f3f393
6858164: invokedynamic code needs some cleanup (post-6655638)
jrose
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1039
diff
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|
2461 /*&& java_dyn_CallSite::is_instance(call_site_oop)*/, "must be sane"); |
|
726
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|
2462 if (TraceMethodHandles) { |
|
1059
389049f3f393
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diff
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|
2463 #ifndef PRODUCT |
|
726
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diff
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|
2464 tty->print_cr("Linked invokedynamic bci=%d site="INTPTR_FORMAT":", caller_bci, call_site_oop); |
|
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diff
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|
2465 call_site_oop->print(); |
|
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diff
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|
2466 tty->cr(); |
|
1059
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jrose
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diff
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|
2467 #endif //PRODUCT |
|
726
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2468 } |
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2469 return call_site_oop; |
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2470 } |
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2471 |
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2472 Handle SystemDictionary::find_bootstrap_method(KlassHandle caller, TRAPS) { |
|
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2473 Handle empty; |
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2474 if (!caller->oop_is_instance()) return empty; |
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2475 |
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2476 instanceKlassHandle ik(THREAD, caller()); |
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2477 |
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2478 oop boot_method_oop = ik->bootstrap_method(); |
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2479 if (boot_method_oop != NULL) { |
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2480 if (TraceMethodHandles) { |
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2481 tty->print_cr("bootstrap method for "PTR_FORMAT" cached as "PTR_FORMAT":", ik(), boot_method_oop); |
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2482 } |
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2483 assert(boot_method_oop->is_oop() |
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2484 && java_dyn_MethodHandle::is_instance(boot_method_oop), "must be sane"); |
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2485 return Handle(THREAD, boot_method_oop); |
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2486 } |
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2487 |
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2488 return empty; |
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2489 } |
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2490 |
| 0 | 2491 // Since the identity hash code for symbols changes when the symbols are |
| 2492 // moved from the regular perm gen (hash in the mark word) to the shared | |
| 2493 // spaces (hash is the address), the classes loaded into the dictionary | |
| 2494 // may be in the wrong buckets. | |
| 2495 | |
| 2496 void SystemDictionary::reorder_dictionary() { | |
| 2497 dictionary()->reorder_dictionary(); | |
| 2498 } | |
| 2499 | |
| 2500 | |
| 2501 void SystemDictionary::copy_buckets(char** top, char* end) { | |
| 2502 dictionary()->copy_buckets(top, end); | |
| 2503 } | |
| 2504 | |
| 2505 | |
| 2506 void SystemDictionary::copy_table(char** top, char* end) { | |
| 2507 dictionary()->copy_table(top, end); | |
| 2508 } | |
| 2509 | |
| 2510 | |
| 2511 void SystemDictionary::reverse() { | |
| 2512 dictionary()->reverse(); | |
| 2513 } | |
| 2514 | |
| 2515 int SystemDictionary::number_of_classes() { | |
| 2516 return dictionary()->number_of_entries(); | |
| 2517 } | |
| 2518 | |
| 2519 | |
| 2520 // ---------------------------------------------------------------------------- | |
| 2521 #ifndef PRODUCT | |
| 2522 | |
| 2523 void SystemDictionary::print() { | |
| 2524 dictionary()->print(); | |
| 2525 | |
| 2526 // Placeholders | |
| 2527 GCMutexLocker mu(SystemDictionary_lock); | |
| 2528 placeholders()->print(); | |
| 2529 | |
| 2530 // loader constraints - print under SD_lock | |
| 2531 constraints()->print(); | |
| 2532 } | |
| 2533 | |
| 2534 #endif | |
| 2535 | |
| 2536 void SystemDictionary::verify() { | |
| 2537 guarantee(dictionary() != NULL, "Verify of system dictionary failed"); | |
| 2538 guarantee(constraints() != NULL, | |
| 2539 "Verify of loader constraints failed"); | |
| 2540 guarantee(dictionary()->number_of_entries() >= 0 && | |
| 2541 placeholders()->number_of_entries() >= 0, | |
| 2542 "Verify of system dictionary failed"); | |
| 2543 | |
| 2544 // Verify dictionary | |
| 2545 dictionary()->verify(); | |
| 2546 | |
| 2547 GCMutexLocker mu(SystemDictionary_lock); | |
| 2548 placeholders()->verify(); | |
| 2549 | |
| 2550 // Verify constraint table | |
| 2551 guarantee(constraints() != NULL, "Verify of loader constraints failed"); | |
|
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|
2552 constraints()->verify(dictionary(), placeholders()); |
| 0 | 2553 } |
| 2554 | |
| 2555 | |
| 2556 void SystemDictionary::verify_obj_klass_present(Handle obj, | |
| 2557 symbolHandle class_name, | |
| 2558 Handle class_loader) { | |
| 2559 GCMutexLocker mu(SystemDictionary_lock); | |
| 2560 oop probe = find_class_or_placeholder(class_name, class_loader); | |
| 2561 if (probe == NULL) { | |
| 2562 probe = SystemDictionary::find_shared_class(class_name); | |
| 2563 } | |
| 2564 guarantee(probe != NULL && | |
| 2565 (!probe->is_klass() || probe == obj()), | |
| 2566 "Loaded klasses should be in SystemDictionary"); | |
| 2567 } | |
| 2568 | |
| 2569 #ifndef PRODUCT | |
| 2570 | |
| 2571 // statistics code | |
| 2572 class ClassStatistics: AllStatic { | |
| 2573 private: | |
| 2574 static int nclasses; // number of classes | |
| 2575 static int nmethods; // number of methods | |
| 2576 static int nmethoddata; // number of methodData | |
| 2577 static int class_size; // size of class objects in words | |
| 2578 static int method_size; // size of method objects in words | |
| 2579 static int debug_size; // size of debug info in methods | |
| 2580 static int methoddata_size; // size of methodData objects in words | |
| 2581 | |
| 2582 static void do_class(klassOop k) { | |
| 2583 nclasses++; | |
| 2584 class_size += k->size(); | |
| 2585 if (k->klass_part()->oop_is_instance()) { | |
| 2586 instanceKlass* ik = (instanceKlass*)k->klass_part(); | |
| 2587 class_size += ik->methods()->size(); | |
| 2588 class_size += ik->constants()->size(); | |
| 2589 class_size += ik->local_interfaces()->size(); | |
| 2590 class_size += ik->transitive_interfaces()->size(); | |
| 2591 // We do not have to count implementors, since we only store one! | |
| 2592 class_size += ik->fields()->size(); | |
| 2593 } | |
| 2594 } | |
| 2595 | |
| 2596 static void do_method(methodOop m) { | |
| 2597 nmethods++; | |
| 2598 method_size += m->size(); | |
| 2599 // class loader uses same objArray for empty vectors, so don't count these | |
| 2600 if (m->exception_table()->length() != 0) method_size += m->exception_table()->size(); | |
| 2601 if (m->has_stackmap_table()) { | |
| 2602 method_size += m->stackmap_data()->size(); | |
| 2603 } | |
| 2604 | |
| 2605 methodDataOop mdo = m->method_data(); | |
| 2606 if (mdo != NULL) { | |
| 2607 nmethoddata++; | |
| 2608 methoddata_size += mdo->size(); | |
| 2609 } | |
| 2610 } | |
| 2611 | |
| 2612 public: | |
| 2613 static void print() { | |
| 2614 SystemDictionary::classes_do(do_class); | |
| 2615 SystemDictionary::methods_do(do_method); | |
| 2616 tty->print_cr("Class statistics:"); | |
| 2617 tty->print_cr("%d classes (%d bytes)", nclasses, class_size * oopSize); | |
| 2618 tty->print_cr("%d methods (%d bytes = %d base + %d debug info)", nmethods, | |
| 2619 (method_size + debug_size) * oopSize, method_size * oopSize, debug_size * oopSize); | |
| 2620 tty->print_cr("%d methoddata (%d bytes)", nmethoddata, methoddata_size * oopSize); | |
| 2621 } | |
| 2622 }; | |
| 2623 | |
| 2624 | |
| 2625 int ClassStatistics::nclasses = 0; | |
| 2626 int ClassStatistics::nmethods = 0; | |
| 2627 int ClassStatistics::nmethoddata = 0; | |
| 2628 int ClassStatistics::class_size = 0; | |
| 2629 int ClassStatistics::method_size = 0; | |
| 2630 int ClassStatistics::debug_size = 0; | |
| 2631 int ClassStatistics::methoddata_size = 0; | |
| 2632 | |
| 2633 void SystemDictionary::print_class_statistics() { | |
| 2634 ResourceMark rm; | |
| 2635 ClassStatistics::print(); | |
| 2636 } | |
| 2637 | |
| 2638 | |
| 2639 class MethodStatistics: AllStatic { | |
| 2640 public: | |
| 2641 enum { | |
| 2642 max_parameter_size = 10 | |
| 2643 }; | |
| 2644 private: | |
| 2645 | |
| 2646 static int _number_of_methods; | |
| 2647 static int _number_of_final_methods; | |
| 2648 static int _number_of_static_methods; | |
| 2649 static int _number_of_native_methods; | |
| 2650 static int _number_of_synchronized_methods; | |
| 2651 static int _number_of_profiled_methods; | |
| 2652 static int _number_of_bytecodes; | |
| 2653 static int _parameter_size_profile[max_parameter_size]; | |
| 2654 static int _bytecodes_profile[Bytecodes::number_of_java_codes]; | |
| 2655 | |
| 2656 static void initialize() { | |
| 2657 _number_of_methods = 0; | |
| 2658 _number_of_final_methods = 0; | |
| 2659 _number_of_static_methods = 0; | |
| 2660 _number_of_native_methods = 0; | |
| 2661 _number_of_synchronized_methods = 0; | |
| 2662 _number_of_profiled_methods = 0; | |
| 2663 _number_of_bytecodes = 0; | |
| 2664 for (int i = 0; i < max_parameter_size ; i++) _parameter_size_profile[i] = 0; | |
| 2665 for (int j = 0; j < Bytecodes::number_of_java_codes; j++) _bytecodes_profile [j] = 0; | |
| 2666 }; | |
| 2667 | |
| 2668 static void do_method(methodOop m) { | |
| 2669 _number_of_methods++; | |
| 2670 // collect flag info | |
| 2671 if (m->is_final() ) _number_of_final_methods++; | |
| 2672 if (m->is_static() ) _number_of_static_methods++; | |
| 2673 if (m->is_native() ) _number_of_native_methods++; | |
| 2674 if (m->is_synchronized()) _number_of_synchronized_methods++; | |
| 2675 if (m->method_data() != NULL) _number_of_profiled_methods++; | |
| 2676 // collect parameter size info (add one for receiver, if any) | |
| 2677 _parameter_size_profile[MIN2(m->size_of_parameters() + (m->is_static() ? 0 : 1), max_parameter_size - 1)]++; | |
| 2678 // collect bytecodes info | |
| 2679 { | |
| 2680 Thread *thread = Thread::current(); | |
| 2681 HandleMark hm(thread); | |
| 2682 BytecodeStream s(methodHandle(thread, m)); | |
| 2683 Bytecodes::Code c; | |
| 2684 while ((c = s.next()) >= 0) { | |
| 2685 _number_of_bytecodes++; | |
| 2686 _bytecodes_profile[c]++; | |
| 2687 } | |
| 2688 } | |
| 2689 } | |
| 2690 | |
| 2691 public: | |
| 2692 static void print() { | |
| 2693 initialize(); | |
| 2694 SystemDictionary::methods_do(do_method); | |
| 2695 // generate output | |
| 2696 tty->cr(); | |
| 2697 tty->print_cr("Method statistics (static):"); | |
| 2698 // flag distribution | |
| 2699 tty->cr(); | |
| 2700 tty->print_cr("%6d final methods %6.1f%%", _number_of_final_methods , _number_of_final_methods * 100.0F / _number_of_methods); | |
| 2701 tty->print_cr("%6d static methods %6.1f%%", _number_of_static_methods , _number_of_static_methods * 100.0F / _number_of_methods); | |
| 2702 tty->print_cr("%6d native methods %6.1f%%", _number_of_native_methods , _number_of_native_methods * 100.0F / _number_of_methods); | |
| 2703 tty->print_cr("%6d synchronized methods %6.1f%%", _number_of_synchronized_methods, _number_of_synchronized_methods * 100.0F / _number_of_methods); | |
| 2704 tty->print_cr("%6d profiled methods %6.1f%%", _number_of_profiled_methods, _number_of_profiled_methods * 100.0F / _number_of_methods); | |
| 2705 // parameter size profile | |
| 2706 tty->cr(); | |
| 2707 { int tot = 0; | |
| 2708 int avg = 0; | |
| 2709 for (int i = 0; i < max_parameter_size; i++) { | |
| 2710 int n = _parameter_size_profile[i]; | |
| 2711 tot += n; | |
| 2712 avg += n*i; | |
| 2713 tty->print_cr("parameter size = %1d: %6d methods %5.1f%%", i, n, n * 100.0F / _number_of_methods); | |
| 2714 } | |
| 2715 assert(tot == _number_of_methods, "should be the same"); | |
| 2716 tty->print_cr(" %6d methods 100.0%%", _number_of_methods); | |
| 2717 tty->print_cr("(average parameter size = %3.1f including receiver, if any)", (float)avg / _number_of_methods); | |
| 2718 } | |
| 2719 // bytecodes profile | |
| 2720 tty->cr(); | |
| 2721 { int tot = 0; | |
| 2722 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) { | |
| 2723 if (Bytecodes::is_defined(i)) { | |
| 2724 Bytecodes::Code c = Bytecodes::cast(i); | |
| 2725 int n = _bytecodes_profile[c]; | |
| 2726 tot += n; | |
| 2727 tty->print_cr("%9d %7.3f%% %s", n, n * 100.0F / _number_of_bytecodes, Bytecodes::name(c)); | |
| 2728 } | |
| 2729 } | |
| 2730 assert(tot == _number_of_bytecodes, "should be the same"); | |
| 2731 tty->print_cr("%9d 100.000%%", _number_of_bytecodes); | |
| 2732 } | |
| 2733 tty->cr(); | |
| 2734 } | |
| 2735 }; | |
| 2736 | |
| 2737 int MethodStatistics::_number_of_methods; | |
| 2738 int MethodStatistics::_number_of_final_methods; | |
| 2739 int MethodStatistics::_number_of_static_methods; | |
| 2740 int MethodStatistics::_number_of_native_methods; | |
| 2741 int MethodStatistics::_number_of_synchronized_methods; | |
| 2742 int MethodStatistics::_number_of_profiled_methods; | |
| 2743 int MethodStatistics::_number_of_bytecodes; | |
| 2744 int MethodStatistics::_parameter_size_profile[MethodStatistics::max_parameter_size]; | |
| 2745 int MethodStatistics::_bytecodes_profile[Bytecodes::number_of_java_codes]; | |
| 2746 | |
| 2747 | |
| 2748 void SystemDictionary::print_method_statistics() { | |
| 2749 MethodStatistics::print(); | |
| 2750 } | |
| 2751 | |
| 2752 #endif // PRODUCT |