Mercurial > hg > graal-jvmci-8
annotate src/share/vm/classfile/systemDictionary.cpp @ 2044:06f017f7daa7
Merge.
| author | Thomas Wuerthinger <wuerthinger@ssw.jku.at> |
|---|---|
| date | Fri, 07 Jan 2011 18:18:08 +0100 |
| parents | 2d26b0046e0d f2da85a9b08e |
| children | d25d4ca69222 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1903 | 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/dictionary.hpp" | |
| 27 #include "classfile/javaClasses.hpp" | |
| 28 #include "classfile/loaderConstraints.hpp" | |
| 29 #include "classfile/placeholders.hpp" | |
| 30 #include "classfile/resolutionErrors.hpp" | |
| 31 #include "classfile/systemDictionary.hpp" | |
| 32 #include "classfile/vmSymbols.hpp" | |
| 33 #include "interpreter/bytecodeStream.hpp" | |
| 34 #include "interpreter/interpreter.hpp" | |
| 35 #include "memory/gcLocker.hpp" | |
| 36 #include "memory/oopFactory.hpp" | |
| 37 #include "oops/instanceKlass.hpp" | |
| 38 #include "oops/instanceRefKlass.hpp" | |
| 39 #include "oops/klass.inline.hpp" | |
| 40 #include "oops/methodDataOop.hpp" | |
| 41 #include "oops/objArrayKlass.hpp" | |
| 42 #include "oops/oop.inline.hpp" | |
| 43 #include "oops/oop.inline2.hpp" | |
| 44 #include "oops/typeArrayKlass.hpp" | |
| 45 #include "prims/jvmtiEnvBase.hpp" | |
| 46 #include "prims/methodHandles.hpp" | |
| 47 #include "runtime/biasedLocking.hpp" | |
| 48 #include "runtime/fieldType.hpp" | |
| 49 #include "runtime/handles.inline.hpp" | |
| 50 #include "runtime/java.hpp" | |
| 51 #include "runtime/javaCalls.hpp" | |
| 52 #include "runtime/mutexLocker.hpp" | |
| 53 #include "runtime/signature.hpp" | |
| 54 #include "services/classLoadingService.hpp" | |
| 55 #include "services/threadService.hpp" | |
| 0 | 56 |
| 57 | |
| 1903 | 58 Dictionary* SystemDictionary::_dictionary = NULL; |
| 59 PlaceholderTable* SystemDictionary::_placeholders = NULL; | |
| 60 Dictionary* SystemDictionary::_shared_dictionary = NULL; | |
| 61 LoaderConstraintTable* SystemDictionary::_loader_constraints = NULL; | |
| 62 ResolutionErrorTable* SystemDictionary::_resolution_errors = NULL; | |
| 63 SymbolPropertyTable* SystemDictionary::_invoke_method_table = NULL; | |
| 0 | 64 |
| 65 | |
| 66 int SystemDictionary::_number_of_modifications = 0; | |
| 67 | |
| 68 oop SystemDictionary::_system_loader_lock_obj = NULL; | |
| 69 | |
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70 klassOop SystemDictionary::_well_known_klasses[SystemDictionary::WKID_LIMIT] |
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71 = { NULL /*, NULL...*/ }; |
| 0 | 72 |
| 73 klassOop SystemDictionary::_box_klasses[T_VOID+1] = { NULL /*, NULL...*/ }; | |
| 74 | |
| 75 oop SystemDictionary::_java_system_loader = NULL; | |
| 76 | |
| 77 bool SystemDictionary::_has_loadClassInternal = false; | |
| 78 bool SystemDictionary::_has_checkPackageAccess = false; | |
| 79 | |
| 80 // lazily initialized klass variables | |
| 81 volatile klassOop SystemDictionary::_abstract_ownable_synchronizer_klass = NULL; | |
| 82 | |
| 83 | |
| 84 // ---------------------------------------------------------------------------- | |
| 85 // Java-level SystemLoader | |
| 86 | |
| 87 oop SystemDictionary::java_system_loader() { | |
| 88 return _java_system_loader; | |
| 89 } | |
| 90 | |
| 91 void SystemDictionary::compute_java_system_loader(TRAPS) { | |
| 1142 | 92 KlassHandle system_klass(THREAD, WK_KLASS(ClassLoader_klass)); |
| 0 | 93 JavaValue result(T_OBJECT); |
| 94 JavaCalls::call_static(&result, | |
| 1142 | 95 KlassHandle(THREAD, WK_KLASS(ClassLoader_klass)), |
| 0 | 96 vmSymbolHandles::getSystemClassLoader_name(), |
| 97 vmSymbolHandles::void_classloader_signature(), | |
| 98 CHECK); | |
| 99 | |
| 100 _java_system_loader = (oop)result.get_jobject(); | |
| 101 } | |
| 102 | |
| 103 | |
| 104 // ---------------------------------------------------------------------------- | |
| 105 // debugging | |
| 106 | |
| 107 #ifdef ASSERT | |
| 108 | |
| 109 // return true if class_name contains no '.' (internal format is '/') | |
| 110 bool SystemDictionary::is_internal_format(symbolHandle class_name) { | |
| 111 if (class_name.not_null()) { | |
| 112 ResourceMark rm; | |
| 113 char* name = class_name->as_C_string(); | |
| 114 return strchr(name, '.') == NULL; | |
| 115 } else { | |
| 116 return true; | |
| 117 } | |
| 118 } | |
| 119 | |
| 120 #endif | |
| 121 | |
| 122 // ---------------------------------------------------------------------------- | |
| 514 | 123 // Parallel class loading check |
| 124 | |
| 125 bool SystemDictionary::is_parallelCapable(Handle class_loader) { | |
| 126 if (UnsyncloadClass || class_loader.is_null()) return true; | |
| 127 if (AlwaysLockClassLoader) return false; | |
| 128 return java_lang_Class::parallelCapable(class_loader()); | |
| 129 } | |
| 130 // ---------------------------------------------------------------------------- | |
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131 // ParallelDefineClass flag does not apply to bootclass loader |
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132 bool SystemDictionary::is_parallelDefine(Handle class_loader) { |
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133 if (class_loader.is_null()) return false; |
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134 if (AllowParallelDefineClass && java_lang_Class::parallelCapable(class_loader())) { |
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135 return true; |
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136 } |
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137 return false; |
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138 } |
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139 // ---------------------------------------------------------------------------- |
| 0 | 140 // Resolving of classes |
| 141 | |
| 142 // Forwards to resolve_or_null | |
| 143 | |
| 144 klassOop SystemDictionary::resolve_or_fail(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS) { | |
| 145 klassOop klass = resolve_or_null(class_name, class_loader, protection_domain, THREAD); | |
| 146 if (HAS_PENDING_EXCEPTION || klass == NULL) { | |
| 147 KlassHandle k_h(THREAD, klass); | |
| 148 // can return a null klass | |
| 149 klass = handle_resolution_exception(class_name, class_loader, protection_domain, throw_error, k_h, THREAD); | |
| 150 } | |
| 151 return klass; | |
| 152 } | |
| 153 | |
| 154 klassOop SystemDictionary::handle_resolution_exception(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS) { | |
| 155 if (HAS_PENDING_EXCEPTION) { | |
| 156 // If we have a pending exception we forward it to the caller, unless throw_error is true, | |
| 157 // in which case we have to check whether the pending exception is a ClassNotFoundException, | |
| 158 // and if so convert it to a NoClassDefFoundError | |
| 159 // And chain the original ClassNotFoundException | |
| 1142 | 160 if (throw_error && PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass())) { |
| 0 | 161 ResourceMark rm(THREAD); |
| 162 assert(klass_h() == NULL, "Should not have result with exception pending"); | |
| 163 Handle e(THREAD, PENDING_EXCEPTION); | |
| 164 CLEAR_PENDING_EXCEPTION; | |
| 165 THROW_MSG_CAUSE_0(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string(), e); | |
| 166 } else { | |
| 167 return NULL; | |
| 168 } | |
| 169 } | |
| 170 // Class not found, throw appropriate error or exception depending on value of throw_error | |
| 171 if (klass_h() == NULL) { | |
| 172 ResourceMark rm(THREAD); | |
| 173 if (throw_error) { | |
| 174 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string()); | |
| 175 } else { | |
| 176 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), class_name->as_C_string()); | |
| 177 } | |
| 178 } | |
| 179 return (klassOop)klass_h(); | |
| 180 } | |
| 181 | |
| 182 | |
| 183 klassOop SystemDictionary::resolve_or_fail(symbolHandle class_name, | |
| 184 bool throw_error, TRAPS) | |
| 185 { | |
| 186 return resolve_or_fail(class_name, Handle(), Handle(), throw_error, THREAD); | |
| 187 } | |
| 188 | |
| 189 | |
| 190 // Forwards to resolve_instance_class_or_null | |
| 191 | |
| 192 klassOop SystemDictionary::resolve_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS) { | |
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193 // (tw) May we do this? |
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194 // assert(!THREAD->is_Compiler_thread(), "Can not load classes with the Compiler thread"); |
| 0 | 195 if (FieldType::is_array(class_name())) { |
| 196 return resolve_array_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); | |
| 197 } else { | |
| 198 return resolve_instance_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); | |
| 199 } | |
| 200 } | |
| 201 | |
| 202 klassOop SystemDictionary::resolve_or_null(symbolHandle class_name, TRAPS) { | |
| 203 return resolve_or_null(class_name, Handle(), Handle(), THREAD); | |
| 204 } | |
| 205 | |
| 206 // Forwards to resolve_instance_class_or_null | |
| 207 | |
| 208 klassOop SystemDictionary::resolve_array_class_or_null(symbolHandle class_name, | |
| 209 Handle class_loader, | |
| 210 Handle protection_domain, | |
| 211 TRAPS) { | |
| 212 assert(FieldType::is_array(class_name()), "must be array"); | |
| 213 jint dimension; | |
| 214 symbolOop object_key; | |
| 215 klassOop k = NULL; | |
| 216 // dimension and object_key are assigned as a side-effect of this call | |
| 217 BasicType t = FieldType::get_array_info(class_name(), | |
| 218 &dimension, | |
| 219 &object_key, | |
| 220 CHECK_NULL); | |
| 221 | |
| 222 if (t == T_OBJECT) { | |
| 223 symbolHandle h_key(THREAD, object_key); | |
| 224 // naked oop "k" is OK here -- we assign back into it | |
| 225 k = SystemDictionary::resolve_instance_class_or_null(h_key, | |
| 226 class_loader, | |
| 227 protection_domain, | |
| 228 CHECK_NULL); | |
| 229 if (k != NULL) { | |
| 230 k = Klass::cast(k)->array_klass(dimension, CHECK_NULL); | |
| 231 } | |
| 232 } else { | |
| 233 k = Universe::typeArrayKlassObj(t); | |
| 234 k = typeArrayKlass::cast(k)->array_klass(dimension, CHECK_NULL); | |
| 235 } | |
| 236 return k; | |
| 237 } | |
| 238 | |
| 239 | |
| 240 // Must be called for any super-class or super-interface resolution | |
| 241 // during class definition to allow class circularity checking | |
| 242 // super-interface callers: | |
| 243 // parse_interfaces - for defineClass & jvmtiRedefineClasses | |
| 244 // super-class callers: | |
| 245 // ClassFileParser - for defineClass & jvmtiRedefineClasses | |
| 246 // load_shared_class - while loading a class from shared archive | |
| 514 | 247 // resolve_instance_class_or_null: |
| 248 // via: handle_parallel_super_load | |
| 0 | 249 // when resolving a class that has an existing placeholder with |
| 250 // a saved superclass [i.e. a defineClass is currently in progress] | |
| 251 // if another thread is trying to resolve the class, it must do | |
| 252 // super-class checks on its own thread to catch class circularity | |
| 253 // This last call is critical in class circularity checking for cases | |
| 254 // where classloading is delegated to different threads and the | |
| 255 // classloader lock is released. | |
| 256 // Take the case: Base->Super->Base | |
| 257 // 1. If thread T1 tries to do a defineClass of class Base | |
| 258 // resolve_super_or_fail creates placeholder: T1, Base (super Super) | |
| 259 // 2. resolve_instance_class_or_null does not find SD or placeholder for Super | |
| 260 // so it tries to load Super | |
| 261 // 3. If we load the class internally, or user classloader uses same thread | |
| 262 // loadClassFromxxx or defineClass via parseClassFile Super ... | |
| 263 // 3.1 resolve_super_or_fail creates placeholder: T1, Super (super Base) | |
| 264 // 3.3 resolve_instance_class_or_null Base, finds placeholder for Base | |
| 265 // 3.4 calls resolve_super_or_fail Base | |
| 266 // 3.5 finds T1,Base -> throws class circularity | |
| 267 //OR 4. If T2 tries to resolve Super via defineClass Super ... | |
| 268 // 4.1 resolve_super_or_fail creates placeholder: T2, Super (super Base) | |
| 269 // 4.2 resolve_instance_class_or_null Base, finds placeholder for Base (super Super) | |
| 270 // 4.3 calls resolve_super_or_fail Super in parallel on own thread T2 | |
| 271 // 4.4 finds T2, Super -> throws class circularity | |
| 272 // Must be called, even if superclass is null, since this is | |
| 273 // where the placeholder entry is created which claims this | |
| 274 // thread is loading this class/classloader. | |
| 275 klassOop SystemDictionary::resolve_super_or_fail(symbolHandle child_name, | |
| 276 symbolHandle class_name, | |
| 277 Handle class_loader, | |
| 278 Handle protection_domain, | |
| 279 bool is_superclass, | |
| 280 TRAPS) { | |
| 281 | |
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282 // Try to get one of the well-known klasses. |
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283 // They are trusted, and do not participate in circularities. |
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284 if (LinkWellKnownClasses) { |
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285 klassOop k = find_well_known_klass(class_name()); |
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286 if (k != NULL) { |
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287 return k; |
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288 } |
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289 } |
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290 |
| 0 | 291 // Double-check, if child class is already loaded, just return super-class,interface |
| 292 // Don't add a placedholder if already loaded, i.e. already in system dictionary | |
| 293 // Make sure there's a placeholder for the *child* before resolving. | |
| 294 // Used as a claim that this thread is currently loading superclass/classloader | |
| 295 // Used here for ClassCircularity checks and also for heap verification | |
| 296 // (every instanceKlass in the heap needs to be in the system dictionary | |
| 297 // or have a placeholder). | |
| 298 // Must check ClassCircularity before checking if super class is already loaded | |
| 299 // | |
| 300 // We might not already have a placeholder if this child_name was | |
| 301 // first seen via resolve_from_stream (jni_DefineClass or JVM_DefineClass); | |
| 302 // the name of the class might not be known until the stream is actually | |
| 303 // parsed. | |
| 304 // Bugs 4643874, 4715493 | |
| 305 // compute_hash can have a safepoint | |
| 306 | |
| 307 unsigned int d_hash = dictionary()->compute_hash(child_name, class_loader); | |
| 308 int d_index = dictionary()->hash_to_index(d_hash); | |
| 309 unsigned int p_hash = placeholders()->compute_hash(child_name, class_loader); | |
| 310 int p_index = placeholders()->hash_to_index(p_hash); | |
| 311 // can't throw error holding a lock | |
| 312 bool child_already_loaded = false; | |
| 313 bool throw_circularity_error = false; | |
| 314 { | |
| 315 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 316 klassOop childk = find_class(d_index, d_hash, child_name, class_loader); | |
| 317 klassOop quicksuperk; | |
| 318 // to support // loading: if child done loading, just return superclass | |
| 319 // if class_name, & class_loader don't match: | |
| 320 // if initial define, SD update will give LinkageError | |
| 321 // if redefine: compare_class_versions will give HIERARCHY_CHANGED | |
| 322 // so we don't throw an exception here. | |
| 323 // see: nsk redefclass014 & java.lang.instrument Instrument032 | |
| 324 if ((childk != NULL ) && (is_superclass) && | |
| 325 ((quicksuperk = instanceKlass::cast(childk)->super()) != NULL) && | |
| 326 | |
| 327 ((Klass::cast(quicksuperk)->name() == class_name()) && | |
| 328 (Klass::cast(quicksuperk)->class_loader() == class_loader()))) { | |
| 329 return quicksuperk; | |
| 330 } else { | |
| 331 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, class_loader); | |
| 332 if (probe && probe->check_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER)) { | |
| 333 throw_circularity_error = true; | |
| 334 } | |
| 514 | 335 } |
| 336 if (!throw_circularity_error) { | |
| 0 | 337 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, child_name, class_loader, PlaceholderTable::LOAD_SUPER, class_name, THREAD); |
| 338 } | |
| 339 } | |
| 340 if (throw_circularity_error) { | |
| 341 ResourceMark rm(THREAD); | |
| 342 THROW_MSG_0(vmSymbols::java_lang_ClassCircularityError(), child_name->as_C_string()); | |
| 343 } | |
| 344 | |
| 345 // java.lang.Object should have been found above | |
| 346 assert(class_name() != NULL, "null super class for resolving"); | |
| 347 // Resolve the super class or interface, check results on return | |
| 348 klassOop superk = NULL; | |
| 349 superk = SystemDictionary::resolve_or_null(class_name, | |
| 350 class_loader, | |
| 351 protection_domain, | |
| 352 THREAD); | |
| 353 | |
| 354 KlassHandle superk_h(THREAD, superk); | |
| 355 | |
| 356 // Note: clean up of placeholders currently in callers of | |
| 357 // resolve_super_or_fail - either at update_dictionary time | |
| 358 // or on error | |
| 359 { | |
| 360 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 361 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, class_loader); | |
| 362 if (probe != NULL) { | |
| 363 probe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER); | |
| 364 } | |
| 365 } | |
| 366 if (HAS_PENDING_EXCEPTION || superk_h() == NULL) { | |
| 367 // can null superk | |
| 368 superk_h = KlassHandle(THREAD, handle_resolution_exception(class_name, class_loader, protection_domain, true, superk_h, THREAD)); | |
| 369 } | |
| 370 | |
| 371 return superk_h(); | |
| 372 } | |
| 373 | |
| 374 void SystemDictionary::validate_protection_domain(instanceKlassHandle klass, | |
| 375 Handle class_loader, | |
| 376 Handle protection_domain, | |
| 377 TRAPS) { | |
| 378 if(!has_checkPackageAccess()) return; | |
| 379 | |
| 380 // Now we have to call back to java to check if the initating class has access | |
| 381 JavaValue result(T_VOID); | |
| 382 if (TraceProtectionDomainVerification) { | |
| 383 // Print out trace information | |
| 384 tty->print_cr("Checking package access"); | |
| 385 tty->print(" - class loader: "); class_loader()->print_value_on(tty); tty->cr(); | |
| 386 tty->print(" - protection domain: "); protection_domain()->print_value_on(tty); tty->cr(); | |
| 387 tty->print(" - loading: "); klass()->print_value_on(tty); tty->cr(); | |
| 388 } | |
| 389 | |
| 390 assert(class_loader() != NULL, "should not have non-null protection domain for null classloader"); | |
| 391 | |
| 1142 | 392 KlassHandle system_loader(THREAD, SystemDictionary::ClassLoader_klass()); |
| 0 | 393 JavaCalls::call_special(&result, |
| 394 class_loader, | |
| 395 system_loader, | |
| 396 vmSymbolHandles::checkPackageAccess_name(), | |
| 397 vmSymbolHandles::class_protectiondomain_signature(), | |
| 398 Handle(THREAD, klass->java_mirror()), | |
| 399 protection_domain, | |
| 400 THREAD); | |
| 401 | |
| 402 if (TraceProtectionDomainVerification) { | |
| 403 if (HAS_PENDING_EXCEPTION) { | |
| 404 tty->print_cr(" -> DENIED !!!!!!!!!!!!!!!!!!!!!"); | |
| 405 } else { | |
| 406 tty->print_cr(" -> granted"); | |
| 407 } | |
| 408 tty->cr(); | |
| 409 } | |
| 410 | |
| 411 if (HAS_PENDING_EXCEPTION) return; | |
| 412 | |
| 413 // If no exception has been thrown, we have validated the protection domain | |
| 414 // Insert the protection domain of the initiating class into the set. | |
| 415 { | |
| 416 // We recalculate the entry here -- we've called out to java since | |
| 417 // the last time it was calculated. | |
| 418 symbolHandle kn(THREAD, klass->name()); | |
| 419 unsigned int d_hash = dictionary()->compute_hash(kn, class_loader); | |
| 420 int d_index = dictionary()->hash_to_index(d_hash); | |
| 421 | |
| 422 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 423 { | |
| 424 // Note that we have an entry, and entries can be deleted only during GC, | |
| 425 // so we cannot allow GC to occur while we're holding this entry. | |
| 426 | |
| 427 // We're using a No_Safepoint_Verifier to catch any place where we | |
| 428 // might potentially do a GC at all. | |
| 429 // SystemDictionary::do_unloading() asserts that classes are only | |
| 430 // unloaded at a safepoint. | |
| 431 No_Safepoint_Verifier nosafepoint; | |
| 432 dictionary()->add_protection_domain(d_index, d_hash, klass, class_loader, | |
| 433 protection_domain, THREAD); | |
| 434 } | |
| 435 } | |
| 436 } | |
| 437 | |
| 438 // We only get here if this thread finds that another thread | |
| 439 // has already claimed the placeholder token for the current operation, | |
| 440 // but that other thread either never owned or gave up the | |
| 441 // object lock | |
| 442 // Waits on SystemDictionary_lock to indicate placeholder table updated | |
| 443 // On return, caller must recheck placeholder table state | |
| 444 // | |
| 445 // We only get here if | |
| 446 // 1) custom classLoader, i.e. not bootstrap classloader | |
| 447 // 2) UnsyncloadClass not set | |
| 448 // 3) custom classLoader has broken the class loader objectLock | |
| 449 // so another thread got here in parallel | |
| 450 // | |
| 451 // lockObject must be held. | |
| 452 // Complicated dance due to lock ordering: | |
| 453 // Must first release the classloader object lock to | |
| 454 // allow initial definer to complete the class definition | |
| 455 // and to avoid deadlock | |
| 456 // Reclaim classloader lock object with same original recursion count | |
| 457 // Must release SystemDictionary_lock after notify, since | |
| 458 // class loader lock must be claimed before SystemDictionary_lock | |
| 459 // to prevent deadlocks | |
| 460 // | |
| 461 // The notify allows applications that did an untimed wait() on | |
| 462 // the classloader object lock to not hang. | |
| 463 void SystemDictionary::double_lock_wait(Handle lockObject, TRAPS) { | |
| 464 assert_lock_strong(SystemDictionary_lock); | |
| 465 | |
| 466 bool calledholdinglock | |
| 467 = ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, lockObject); | |
| 468 assert(calledholdinglock,"must hold lock for notify"); | |
| 514 | 469 assert((!(lockObject() == _system_loader_lock_obj) && !is_parallelCapable(lockObject)), "unexpected double_lock_wait"); |
| 0 | 470 ObjectSynchronizer::notifyall(lockObject, THREAD); |
| 471 intptr_t recursions = ObjectSynchronizer::complete_exit(lockObject, THREAD); | |
| 472 SystemDictionary_lock->wait(); | |
| 473 SystemDictionary_lock->unlock(); | |
| 474 ObjectSynchronizer::reenter(lockObject, recursions, THREAD); | |
| 475 SystemDictionary_lock->lock(); | |
| 476 } | |
| 477 | |
| 478 // If the class in is in the placeholder table, class loading is in progress | |
| 479 // For cases where the application changes threads to load classes, it | |
| 480 // is critical to ClassCircularity detection that we try loading | |
| 481 // the superclass on the same thread internally, so we do parallel | |
| 482 // super class loading here. | |
| 483 // This also is critical in cases where the original thread gets stalled | |
| 484 // even in non-circularity situations. | |
| 485 // Note: only one thread can define the class, but multiple can resolve | |
| 486 // Note: must call resolve_super_or_fail even if null super - | |
| 514 | 487 // to force placeholder entry creation for this class for circularity detection |
| 0 | 488 // Caller must check for pending exception |
| 489 // Returns non-null klassOop if other thread has completed load | |
| 490 // and we are done, | |
| 491 // If return null klassOop and no pending exception, the caller must load the class | |
| 492 instanceKlassHandle SystemDictionary::handle_parallel_super_load( | |
| 493 symbolHandle name, symbolHandle superclassname, Handle class_loader, | |
| 494 Handle protection_domain, Handle lockObject, TRAPS) { | |
| 495 | |
| 496 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
| 497 unsigned int d_hash = dictionary()->compute_hash(name, class_loader); | |
| 498 int d_index = dictionary()->hash_to_index(d_hash); | |
| 499 unsigned int p_hash = placeholders()->compute_hash(name, class_loader); | |
| 500 int p_index = placeholders()->hash_to_index(p_hash); | |
| 501 | |
| 502 // superk is not used, resolve_super called for circularity check only | |
| 503 // This code is reached in two situations. One if this thread | |
| 504 // is loading the same class twice (e.g. ClassCircularity, or | |
| 505 // java.lang.instrument). | |
| 506 // The second is if another thread started the resolve_super first | |
| 507 // and has not yet finished. | |
| 508 // In both cases the original caller will clean up the placeholder | |
| 509 // entry on error. | |
| 510 klassOop superk = SystemDictionary::resolve_super_or_fail(name, | |
| 511 superclassname, | |
| 512 class_loader, | |
| 513 protection_domain, | |
| 514 true, | |
| 515 CHECK_(nh)); | |
| 516 // We don't redefine the class, so we just need to clean up if there | |
| 517 // was not an error (don't want to modify any system dictionary | |
| 518 // data structures). | |
| 519 { | |
| 520 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 521 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
| 522 SystemDictionary_lock->notify_all(); | |
| 523 } | |
| 524 | |
| 514 | 525 // parallelCapable class loaders do NOT wait for parallel superclass loads to complete |
| 526 // Serial class loaders and bootstrap classloader do wait for superclass loads | |
| 527 if (!class_loader.is_null() && is_parallelCapable(class_loader)) { | |
| 0 | 528 MutexLocker mu(SystemDictionary_lock, THREAD); |
| 529 // Check if classloading completed while we were loading superclass or waiting | |
| 530 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 531 if (check != NULL) { | |
| 532 // Klass is already loaded, so just return it | |
| 533 return(instanceKlassHandle(THREAD, check)); | |
| 534 } else { | |
| 535 return nh; | |
| 536 } | |
| 537 } | |
| 538 | |
| 539 // must loop to both handle other placeholder updates | |
| 540 // and spurious notifications | |
| 541 bool super_load_in_progress = true; | |
| 542 PlaceholderEntry* placeholder; | |
| 543 while (super_load_in_progress) { | |
| 544 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 545 // Check if classloading completed while we were loading superclass or waiting | |
| 546 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 547 if (check != NULL) { | |
| 548 // Klass is already loaded, so just return it | |
| 549 return(instanceKlassHandle(THREAD, check)); | |
| 550 } else { | |
| 551 placeholder = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
| 552 if (placeholder && placeholder->super_load_in_progress() ){ | |
| 553 // Before UnsyncloadClass: | |
| 554 // We only get here if the application has released the | |
| 555 // classloader lock when another thread was in the middle of loading a | |
| 556 // superclass/superinterface for this class, and now | |
| 557 // this thread is also trying to load this class. | |
| 558 // To minimize surprises, the first thread that started to | |
| 559 // load a class should be the one to complete the loading | |
| 560 // with the classfile it initially expected. | |
| 561 // This logic has the current thread wait once it has done | |
| 562 // all the superclass/superinterface loading it can, until | |
| 563 // the original thread completes the class loading or fails | |
| 564 // If it completes we will use the resulting instanceKlass | |
| 565 // which we will find below in the systemDictionary. | |
| 566 // We also get here for parallel bootstrap classloader | |
| 567 if (class_loader.is_null()) { | |
| 568 SystemDictionary_lock->wait(); | |
| 569 } else { | |
| 570 double_lock_wait(lockObject, THREAD); | |
| 571 } | |
| 572 } else { | |
| 573 // If not in SD and not in PH, other thread's load must have failed | |
| 574 super_load_in_progress = false; | |
| 575 } | |
| 576 } | |
| 577 } | |
| 578 return (nh); | |
| 579 } | |
| 580 | |
| 581 | |
| 582 klassOop SystemDictionary::resolve_instance_class_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS) { | |
| 583 assert(class_name.not_null() && !FieldType::is_array(class_name()), "invalid class name"); | |
| 584 // First check to see if we should remove wrapping L and ; | |
| 585 symbolHandle name; | |
| 586 if (FieldType::is_obj(class_name())) { | |
| 587 ResourceMark rm(THREAD); | |
| 588 // Ignore wrapping L and ;. | |
| 589 name = oopFactory::new_symbol_handle(class_name()->as_C_string() + 1, class_name()->utf8_length() - 2, CHECK_NULL); | |
| 590 } else { | |
| 591 name = class_name; | |
| 592 } | |
| 593 | |
| 594 // UseNewReflection | |
| 595 // Fix for 4474172; see evaluation for more details | |
| 596 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); | |
| 597 | |
| 598 // Do lookup to see if class already exist and the protection domain | |
| 599 // has the right access | |
| 600 unsigned int d_hash = dictionary()->compute_hash(name, class_loader); | |
| 601 int d_index = dictionary()->hash_to_index(d_hash); | |
| 602 klassOop probe = dictionary()->find(d_index, d_hash, name, class_loader, | |
| 603 protection_domain, THREAD); | |
| 604 if (probe != NULL) return probe; | |
| 605 | |
| 606 | |
| 607 // Non-bootstrap class loaders will call out to class loader and | |
| 608 // define via jvm/jni_DefineClass which will acquire the | |
| 609 // class loader object lock to protect against multiple threads | |
| 610 // defining the class in parallel by accident. | |
| 611 // This lock must be acquired here so the waiter will find | |
| 612 // any successful result in the SystemDictionary and not attempt | |
| 613 // the define | |
| 514 | 614 // ParallelCapable Classloaders and the bootstrap classloader, |
| 0 | 615 // or all classloaders with UnsyncloadClass do not acquire lock here |
| 616 bool DoObjectLock = true; | |
| 514 | 617 if (is_parallelCapable(class_loader)) { |
| 0 | 618 DoObjectLock = false; |
| 619 } | |
| 620 | |
| 621 unsigned int p_hash = placeholders()->compute_hash(name, class_loader); | |
| 622 int p_index = placeholders()->hash_to_index(p_hash); | |
| 623 | |
| 624 // Class is not in SystemDictionary so we have to do loading. | |
| 625 // Make sure we are synchronized on the class loader before we proceed | |
| 626 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
| 627 check_loader_lock_contention(lockObject, THREAD); | |
| 628 ObjectLocker ol(lockObject, THREAD, DoObjectLock); | |
| 629 | |
| 630 // Check again (after locking) if class already exist in SystemDictionary | |
| 631 bool class_has_been_loaded = false; | |
| 632 bool super_load_in_progress = false; | |
| 633 bool havesupername = false; | |
| 634 instanceKlassHandle k; | |
| 635 PlaceholderEntry* placeholder; | |
| 636 symbolHandle superclassname; | |
| 637 | |
| 638 { | |
| 639 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 640 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 641 if (check != NULL) { | |
| 642 // Klass is already loaded, so just return it | |
| 643 class_has_been_loaded = true; | |
| 644 k = instanceKlassHandle(THREAD, check); | |
| 645 } else { | |
| 646 placeholder = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
| 647 if (placeholder && placeholder->super_load_in_progress()) { | |
| 648 super_load_in_progress = true; | |
| 649 if (placeholder->havesupername() == true) { | |
| 650 superclassname = symbolHandle(THREAD, placeholder->supername()); | |
| 651 havesupername = true; | |
| 652 } | |
| 653 } | |
| 654 } | |
| 655 } | |
| 656 | |
| 657 // If the class in is in the placeholder table, class loading is in progress | |
| 658 if (super_load_in_progress && havesupername==true) { | |
| 659 k = SystemDictionary::handle_parallel_super_load(name, superclassname, | |
| 660 class_loader, protection_domain, lockObject, THREAD); | |
| 661 if (HAS_PENDING_EXCEPTION) { | |
| 662 return NULL; | |
| 663 } | |
| 664 if (!k.is_null()) { | |
| 665 class_has_been_loaded = true; | |
| 666 } | |
| 667 } | |
| 668 | |
| 669 if (!class_has_been_loaded) { | |
| 670 | |
| 671 // add placeholder entry to record loading instance class | |
| 672 // Five cases: | |
| 673 // All cases need to prevent modifying bootclasssearchpath | |
| 674 // in parallel with a classload of same classname | |
| 514 | 675 // Redefineclasses uses existence of the placeholder for the duration |
| 676 // of the class load to prevent concurrent redefinition of not completely | |
| 677 // defined classes. | |
| 0 | 678 // case 1. traditional classloaders that rely on the classloader object lock |
| 679 // - no other need for LOAD_INSTANCE | |
| 680 // case 2. traditional classloaders that break the classloader object lock | |
| 681 // as a deadlock workaround. Detection of this case requires that | |
| 682 // this check is done while holding the classloader object lock, | |
| 683 // and that lock is still held when calling classloader's loadClass. | |
| 684 // For these classloaders, we ensure that the first requestor | |
| 685 // completes the load and other requestors wait for completion. | |
| 686 // case 3. UnsyncloadClass - don't use objectLocker | |
| 687 // With this flag, we allow parallel classloading of a | |
| 688 // class/classloader pair | |
| 689 // case4. Bootstrap classloader - don't own objectLocker | |
| 690 // This classloader supports parallelism at the classloader level, | |
| 691 // but only allows a single load of a class/classloader pair. | |
| 692 // No performance benefit and no deadlock issues. | |
| 514 | 693 // case 5. parallelCapable user level classloaders - without objectLocker |
| 694 // Allow parallel classloading of a class/classloader pair | |
| 0 | 695 symbolHandle nullsymbolHandle; |
| 696 bool throw_circularity_error = false; | |
| 697 { | |
| 698 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 514 | 699 if (class_loader.is_null() || !is_parallelCapable(class_loader)) { |
| 0 | 700 PlaceholderEntry* oldprobe = placeholders()->get_entry(p_index, p_hash, name, class_loader); |
| 701 if (oldprobe) { | |
| 702 // only need check_seen_thread once, not on each loop | |
| 703 // 6341374 java/lang/Instrument with -Xcomp | |
| 704 if (oldprobe->check_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE)) { | |
| 705 throw_circularity_error = true; | |
| 706 } else { | |
| 707 // case 1: traditional: should never see load_in_progress. | |
| 708 while (!class_has_been_loaded && oldprobe && oldprobe->instance_load_in_progress()) { | |
| 709 | |
| 710 // case 4: bootstrap classloader: prevent futile classloading, | |
| 711 // wait on first requestor | |
| 712 if (class_loader.is_null()) { | |
| 713 SystemDictionary_lock->wait(); | |
| 714 } else { | |
| 715 // case 2: traditional with broken classloader lock. wait on first | |
| 716 // requestor. | |
| 717 double_lock_wait(lockObject, THREAD); | |
| 718 } | |
| 719 // Check if classloading completed while we were waiting | |
| 720 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 721 if (check != NULL) { | |
| 722 // Klass is already loaded, so just return it | |
| 723 k = instanceKlassHandle(THREAD, check); | |
| 724 class_has_been_loaded = true; | |
| 725 } | |
| 726 // check if other thread failed to load and cleaned up | |
| 727 oldprobe = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
| 728 } | |
| 729 } | |
| 730 } | |
| 731 } | |
| 732 // All cases: add LOAD_INSTANCE | |
| 514 | 733 // case 3: UnsyncloadClass || case 5: parallelCapable: allow competing threads to try |
| 0 | 734 // LOAD_INSTANCE in parallel |
| 735 // add placeholder entry even if error - callers will remove on error | |
| 514 | 736 if (!throw_circularity_error && !class_has_been_loaded) { |
| 0 | 737 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, name, class_loader, PlaceholderTable::LOAD_INSTANCE, nullsymbolHandle, THREAD); |
| 738 // For class loaders that do not acquire the classloader object lock, | |
| 739 // if they did not catch another thread holding LOAD_INSTANCE, | |
| 740 // need a check analogous to the acquire ObjectLocker/find_class | |
| 741 // i.e. now that we hold the LOAD_INSTANCE token on loading this class/CL | |
| 742 // one final check if the load has already completed | |
| 514 | 743 // class loaders holding the ObjectLock shouldn't find the class here |
| 0 | 744 klassOop check = find_class(d_index, d_hash, name, class_loader); |
| 745 if (check != NULL) { | |
| 746 // Klass is already loaded, so just return it | |
| 747 k = instanceKlassHandle(THREAD, check); | |
| 748 class_has_been_loaded = true; | |
| 749 newprobe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE); | |
| 514 | 750 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); |
| 751 SystemDictionary_lock->notify_all(); | |
| 0 | 752 } |
| 753 } | |
| 754 } | |
| 755 // must throw error outside of owning lock | |
| 756 if (throw_circularity_error) { | |
| 757 ResourceMark rm(THREAD); | |
| 758 THROW_MSG_0(vmSymbols::java_lang_ClassCircularityError(), name->as_C_string()); | |
| 759 } | |
| 760 | |
| 761 if (!class_has_been_loaded) { | |
| 762 | |
| 763 // Do actual loading | |
| 764 k = load_instance_class(name, class_loader, THREAD); | |
| 765 | |
|
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766 // For UnsyncloadClass only |
| 0 | 767 // If they got a linkageError, check if a parallel class load succeeded. |
| 768 // If it did, then for bytecode resolution the specification requires | |
| 769 // that we return the same result we did for the other thread, i.e. the | |
| 770 // successfully loaded instanceKlass | |
| 771 // Should not get here for classloaders that support parallelism | |
|
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772 // with the new cleaner mechanism, even with AllowParallelDefineClass |
| 514 | 773 // Bootstrap goes through here to allow for an extra guarantee check |
| 0 | 774 if (UnsyncloadClass || (class_loader.is_null())) { |
| 775 if (k.is_null() && HAS_PENDING_EXCEPTION | |
| 1142 | 776 && PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { |
| 0 | 777 MutexLocker mu(SystemDictionary_lock, THREAD); |
| 778 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 779 if (check != NULL) { | |
| 780 // Klass is already loaded, so just use it | |
| 781 k = instanceKlassHandle(THREAD, check); | |
| 782 CLEAR_PENDING_EXCEPTION; | |
| 783 guarantee((!class_loader.is_null()), "dup definition for bootstrap loader?"); | |
| 784 } | |
| 785 } | |
| 786 } | |
| 787 | |
| 788 // clean up placeholder entries for success or error | |
| 789 // This cleans up LOAD_INSTANCE entries | |
| 790 // It also cleans up LOAD_SUPER entries on errors from | |
| 791 // calling load_instance_class | |
| 792 { | |
| 793 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 794 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
| 795 if (probe != NULL) { | |
| 796 probe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE); | |
| 797 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
| 798 SystemDictionary_lock->notify_all(); | |
| 799 } | |
| 800 } | |
| 801 | |
| 802 // If everything was OK (no exceptions, no null return value), and | |
| 803 // class_loader is NOT the defining loader, do a little more bookkeeping. | |
| 804 if (!HAS_PENDING_EXCEPTION && !k.is_null() && | |
| 805 k->class_loader() != class_loader()) { | |
| 806 | |
| 807 check_constraints(d_index, d_hash, k, class_loader, false, THREAD); | |
| 808 | |
| 809 // Need to check for a PENDING_EXCEPTION again; check_constraints | |
| 810 // can throw and doesn't use the CHECK macro. | |
| 811 if (!HAS_PENDING_EXCEPTION) { | |
| 812 { // Grabbing the Compile_lock prevents systemDictionary updates | |
| 813 // during compilations. | |
| 814 MutexLocker mu(Compile_lock, THREAD); | |
| 815 update_dictionary(d_index, d_hash, p_index, p_hash, | |
| 816 k, class_loader, THREAD); | |
| 817 } | |
| 818 if (JvmtiExport::should_post_class_load()) { | |
| 819 Thread *thread = THREAD; | |
| 820 assert(thread->is_Java_thread(), "thread->is_Java_thread()"); | |
| 821 JvmtiExport::post_class_load((JavaThread *) thread, k()); | |
| 822 } | |
| 823 } | |
| 824 } | |
| 825 if (HAS_PENDING_EXCEPTION || k.is_null()) { | |
| 826 // On error, clean up placeholders | |
| 827 { | |
| 828 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 829 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
| 830 SystemDictionary_lock->notify_all(); | |
| 831 } | |
| 832 return NULL; | |
| 833 } | |
| 834 } | |
| 835 } | |
| 836 | |
| 837 #ifdef ASSERT | |
| 838 { | |
| 839 Handle loader (THREAD, k->class_loader()); | |
| 840 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 841 oop kk = find_class_or_placeholder(name, loader); | |
| 842 assert(kk == k(), "should be present in dictionary"); | |
| 843 } | |
| 844 #endif | |
| 845 | |
| 846 // return if the protection domain in NULL | |
| 847 if (protection_domain() == NULL) return k(); | |
| 848 | |
| 849 // Check the protection domain has the right access | |
| 850 { | |
| 851 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 852 // Note that we have an entry, and entries can be deleted only during GC, | |
| 853 // so we cannot allow GC to occur while we're holding this entry. | |
| 854 // We're using a No_Safepoint_Verifier to catch any place where we | |
| 855 // might potentially do a GC at all. | |
| 856 // SystemDictionary::do_unloading() asserts that classes are only | |
| 857 // unloaded at a safepoint. | |
| 858 No_Safepoint_Verifier nosafepoint; | |
| 859 if (dictionary()->is_valid_protection_domain(d_index, d_hash, name, | |
| 860 class_loader, | |
| 861 protection_domain)) { | |
| 862 return k(); | |
| 863 } | |
| 864 } | |
| 865 | |
| 866 // Verify protection domain. If it fails an exception is thrown | |
| 867 validate_protection_domain(k, class_loader, protection_domain, CHECK_(klassOop(NULL))); | |
| 868 | |
| 869 return k(); | |
| 870 } | |
| 871 | |
| 872 | |
| 873 // This routine does not lock the system dictionary. | |
| 874 // | |
| 875 // Since readers don't hold a lock, we must make sure that system | |
| 876 // dictionary entries are only removed at a safepoint (when only one | |
| 877 // thread is running), and are added to in a safe way (all links must | |
| 878 // be updated in an MT-safe manner). | |
| 879 // | |
| 880 // Callers should be aware that an entry could be added just after | |
| 881 // _dictionary->bucket(index) is read here, so the caller will not see | |
| 882 // the new entry. | |
| 883 | |
| 884 klassOop SystemDictionary::find(symbolHandle class_name, | |
| 885 Handle class_loader, | |
| 886 Handle protection_domain, | |
| 887 TRAPS) { | |
| 888 | |
|
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889 // UseNewReflection |
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890 // The result of this call should be consistent with the result |
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891 // of the call to resolve_instance_class_or_null(). |
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892 // See evaluation 6790209 and 4474172 for more details. |
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893 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); |
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894 |
| 0 | 895 unsigned int d_hash = dictionary()->compute_hash(class_name, class_loader); |
| 896 int d_index = dictionary()->hash_to_index(d_hash); | |
| 897 | |
| 898 { | |
| 899 // Note that we have an entry, and entries can be deleted only during GC, | |
| 900 // so we cannot allow GC to occur while we're holding this entry. | |
| 901 // We're using a No_Safepoint_Verifier to catch any place where we | |
| 902 // might potentially do a GC at all. | |
| 903 // SystemDictionary::do_unloading() asserts that classes are only | |
| 904 // unloaded at a safepoint. | |
| 905 No_Safepoint_Verifier nosafepoint; | |
| 906 return dictionary()->find(d_index, d_hash, class_name, class_loader, | |
| 907 protection_domain, THREAD); | |
| 908 } | |
| 909 } | |
| 910 | |
| 911 | |
| 912 // Look for a loaded instance or array klass by name. Do not do any loading. | |
| 913 // return NULL in case of error. | |
| 914 klassOop SystemDictionary::find_instance_or_array_klass(symbolHandle class_name, | |
| 915 Handle class_loader, | |
| 916 Handle protection_domain, | |
| 917 TRAPS) { | |
| 918 klassOop k = NULL; | |
| 919 assert(class_name() != NULL, "class name must be non NULL"); | |
|
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920 |
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921 // Try to get one of the well-known klasses. |
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922 if (LinkWellKnownClasses) { |
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923 k = find_well_known_klass(class_name()); |
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924 if (k != NULL) { |
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925 return k; |
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926 } |
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927 } |
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928 |
| 0 | 929 if (FieldType::is_array(class_name())) { |
| 930 // The name refers to an array. Parse the name. | |
| 931 jint dimension; | |
| 932 symbolOop object_key; | |
| 933 | |
| 934 // dimension and object_key are assigned as a side-effect of this call | |
| 935 BasicType t = FieldType::get_array_info(class_name(), &dimension, | |
| 936 &object_key, CHECK_(NULL)); | |
| 937 if (t != T_OBJECT) { | |
| 938 k = Universe::typeArrayKlassObj(t); | |
| 939 } else { | |
| 940 symbolHandle h_key(THREAD, object_key); | |
| 941 k = SystemDictionary::find(h_key, class_loader, protection_domain, THREAD); | |
| 942 } | |
| 943 if (k != NULL) { | |
| 944 k = Klass::cast(k)->array_klass_or_null(dimension); | |
| 945 } | |
| 946 } else { | |
| 947 k = find(class_name, class_loader, protection_domain, THREAD); | |
| 948 } | |
| 949 return k; | |
| 950 } | |
| 951 | |
|
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952 // Quick range check for names of well-known classes: |
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953 static symbolOop wk_klass_name_limits[2] = {NULL, NULL}; |
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954 |
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955 #ifndef PRODUCT |
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956 static int find_wkk_calls, find_wkk_probes, find_wkk_wins; |
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957 // counts for "hello world": 3983, 1616, 1075 |
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958 // => 60% hit after limit guard, 25% total win rate |
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959 #endif |
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960 |
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961 klassOop SystemDictionary::find_well_known_klass(symbolOop class_name) { |
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962 // A bounds-check on class_name will quickly get a negative result. |
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963 NOT_PRODUCT(find_wkk_calls++); |
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964 if (class_name >= wk_klass_name_limits[0] && |
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965 class_name <= wk_klass_name_limits[1]) { |
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966 NOT_PRODUCT(find_wkk_probes++); |
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967 vmSymbols::SID sid = vmSymbols::find_sid(class_name); |
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968 if (sid != vmSymbols::NO_SID) { |
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969 klassOop k = NULL; |
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970 switch (sid) { |
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971 #define WK_KLASS_CASE(name, symbol, ignore_option) \ |
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972 case vmSymbols::VM_SYMBOL_ENUM_NAME(symbol): \ |
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973 k = WK_KLASS(name); break; |
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974 WK_KLASSES_DO(WK_KLASS_CASE) |
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975 #undef WK_KLASS_CASE |
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976 } |
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977 NOT_PRODUCT(if (k != NULL) find_wkk_wins++); |
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978 return k; |
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979 } |
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980 } |
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981 return NULL; |
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982 } |
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983 |
| 0 | 984 // Note: this method is much like resolve_from_stream, but |
| 985 // updates no supplemental data structures. | |
| 986 // TODO consolidate the two methods with a helper routine? | |
| 987 klassOop SystemDictionary::parse_stream(symbolHandle class_name, | |
| 988 Handle class_loader, | |
| 989 Handle protection_domain, | |
| 990 ClassFileStream* st, | |
|
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991 KlassHandle host_klass, |
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992 GrowableArray<Handle>* cp_patches, |
| 0 | 993 TRAPS) { |
| 994 symbolHandle parsed_name; | |
| 995 | |
| 996 // Parse the stream. Note that we do this even though this klass might | |
| 997 // already be present in the SystemDictionary, otherwise we would not | |
| 998 // throw potential ClassFormatErrors. | |
| 999 // | |
| 1000 // Note: "name" is updated. | |
| 1001 // Further note: a placeholder will be added for this class when | |
| 1002 // super classes are loaded (resolve_super_or_fail). We expect this | |
| 1003 // to be called for all classes but java.lang.Object; and we preload | |
| 1004 // java.lang.Object through resolve_or_fail, not this path. | |
| 1005 | |
| 1006 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
| 1007 class_loader, | |
| 1008 protection_domain, | |
| 710 | 1009 host_klass, |
| 1010 cp_patches, | |
| 0 | 1011 parsed_name, |
|
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1012 true, |
| 0 | 1013 THREAD); |
| 1014 | |
| 514 | 1015 |
| 0 | 1016 // We don't redefine the class, so we just need to clean up whether there |
| 1017 // was an error or not (don't want to modify any system dictionary | |
| 1018 // data structures). | |
| 1019 // Parsed name could be null if we threw an error before we got far | |
| 1020 // enough along to parse it -- in that case, there is nothing to clean up. | |
| 1021 if (!parsed_name.is_null()) { | |
| 1022 unsigned int p_hash = placeholders()->compute_hash(parsed_name, | |
| 1023 class_loader); | |
| 1024 int p_index = placeholders()->hash_to_index(p_hash); | |
| 1025 { | |
| 1026 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 1027 placeholders()->find_and_remove(p_index, p_hash, parsed_name, class_loader, THREAD); | |
| 1028 SystemDictionary_lock->notify_all(); | |
| 1029 } | |
| 1030 } | |
| 1031 | |
|
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1032 if (host_klass.not_null() && k.not_null()) { |
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1033 assert(AnonymousClasses, ""); |
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1034 // If it's anonymous, initialize it now, since nobody else will. |
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1035 k->set_host_klass(host_klass()); |
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1036 |
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1037 { |
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1038 MutexLocker mu_r(Compile_lock, THREAD); |
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1039 |
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1040 // Add to class hierarchy, initialize vtables, and do possible |
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1041 // deoptimizations. |
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1042 add_to_hierarchy(k, CHECK_NULL); // No exception, but can block |
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1043 |
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1044 // But, do not add to system dictionary. |
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1045 } |
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1046 |
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1047 k->eager_initialize(THREAD); |
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1048 |
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1049 // notify jvmti |
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1050 if (JvmtiExport::should_post_class_load()) { |
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1051 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); |
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1052 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); |
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1053 } |
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1054 } |
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1055 |
| 0 | 1056 return k(); |
| 1057 } | |
| 1058 | |
| 1059 // Add a klass to the system from a stream (called by jni_DefineClass and | |
| 1060 // JVM_DefineClass). | |
| 1061 // Note: class_name can be NULL. In that case we do not know the name of | |
| 1062 // the class until we have parsed the stream. | |
| 1063 | |
| 1064 klassOop SystemDictionary::resolve_from_stream(symbolHandle class_name, | |
| 1065 Handle class_loader, | |
| 1066 Handle protection_domain, | |
| 1067 ClassFileStream* st, | |
|
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1068 bool verify, |
| 0 | 1069 TRAPS) { |
| 1070 | |
| 514 | 1071 // Classloaders that support parallelism, e.g. bootstrap classloader, |
| 1072 // or all classloaders with UnsyncloadClass do not acquire lock here | |
| 1073 bool DoObjectLock = true; | |
| 1074 if (is_parallelCapable(class_loader)) { | |
| 1075 DoObjectLock = false; | |
| 1076 } | |
| 1077 | |
| 1078 // Make sure we are synchronized on the class loader before we proceed | |
| 0 | 1079 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); |
| 1080 check_loader_lock_contention(lockObject, THREAD); | |
| 514 | 1081 ObjectLocker ol(lockObject, THREAD, DoObjectLock); |
| 0 | 1082 |
| 1083 symbolHandle parsed_name; | |
| 1084 | |
| 1085 // Parse the stream. Note that we do this even though this klass might | |
| 1086 // already be present in the SystemDictionary, otherwise we would not | |
| 1087 // throw potential ClassFormatErrors. | |
| 1088 // | |
| 1089 // Note: "name" is updated. | |
| 1090 // Further note: a placeholder will be added for this class when | |
| 1091 // super classes are loaded (resolve_super_or_fail). We expect this | |
| 1092 // to be called for all classes but java.lang.Object; and we preload | |
| 1093 // java.lang.Object through resolve_or_fail, not this path. | |
| 1094 | |
| 1095 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
| 1096 class_loader, | |
| 1097 protection_domain, | |
| 1098 parsed_name, | |
|
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1099 verify, |
| 0 | 1100 THREAD); |
| 1101 | |
| 1102 const char* pkg = "java/"; | |
| 1103 if (!HAS_PENDING_EXCEPTION && | |
| 1104 !class_loader.is_null() && | |
| 1105 !parsed_name.is_null() && | |
| 1106 !strncmp((const char*)parsed_name->bytes(), pkg, strlen(pkg))) { | |
| 1107 // It is illegal to define classes in the "java." package from | |
| 1108 // JVM_DefineClass or jni_DefineClass unless you're the bootclassloader | |
| 1109 ResourceMark rm(THREAD); | |
| 1110 char* name = parsed_name->as_C_string(); | |
| 1111 char* index = strrchr(name, '/'); | |
| 1112 *index = '\0'; // chop to just the package name | |
| 1113 while ((index = strchr(name, '/')) != NULL) { | |
| 1114 *index = '.'; // replace '/' with '.' in package name | |
| 1115 } | |
| 1116 const char* fmt = "Prohibited package name: %s"; | |
| 1117 size_t len = strlen(fmt) + strlen(name); | |
| 1118 char* message = NEW_RESOURCE_ARRAY(char, len); | |
| 1119 jio_snprintf(message, len, fmt, name); | |
| 1120 Exceptions::_throw_msg(THREAD_AND_LOCATION, | |
| 1121 vmSymbols::java_lang_SecurityException(), message); | |
| 1122 } | |
| 1123 | |
| 1124 if (!HAS_PENDING_EXCEPTION) { | |
| 1125 assert(!parsed_name.is_null(), "Sanity"); | |
| 1126 assert(class_name.is_null() || class_name() == parsed_name(), | |
| 1127 "name mismatch"); | |
| 1128 // Verification prevents us from creating names with dots in them, this | |
| 1129 // asserts that that's the case. | |
| 1130 assert(is_internal_format(parsed_name), | |
| 1131 "external class name format used internally"); | |
| 1132 | |
| 1133 // Add class just loaded | |
| 514 | 1134 // If a class loader supports parallel classloading handle parallel define requests |
| 1135 // find_or_define_instance_class may return a different instanceKlass | |
| 1136 if (is_parallelCapable(class_loader)) { | |
| 1137 k = find_or_define_instance_class(class_name, class_loader, k, THREAD); | |
| 1138 } else { | |
| 1139 define_instance_class(k, THREAD); | |
| 1140 } | |
| 0 | 1141 } |
| 1142 | |
| 1143 // If parsing the class file or define_instance_class failed, we | |
| 1144 // need to remove the placeholder added on our behalf. But we | |
| 1145 // must make sure parsed_name is valid first (it won't be if we had | |
| 1146 // a format error before the class was parsed far enough to | |
| 1147 // find the name). | |
| 1148 if (HAS_PENDING_EXCEPTION && !parsed_name.is_null()) { | |
| 1149 unsigned int p_hash = placeholders()->compute_hash(parsed_name, | |
| 1150 class_loader); | |
| 1151 int p_index = placeholders()->hash_to_index(p_hash); | |
| 1152 { | |
| 1153 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 1154 placeholders()->find_and_remove(p_index, p_hash, parsed_name, class_loader, THREAD); | |
| 1155 SystemDictionary_lock->notify_all(); | |
| 1156 } | |
| 1157 return NULL; | |
| 1158 } | |
| 1159 | |
| 1160 // Make sure that we didn't leave a place holder in the | |
| 1161 // SystemDictionary; this is only done on success | |
| 1162 debug_only( { | |
| 1163 if (!HAS_PENDING_EXCEPTION) { | |
| 1164 assert(!parsed_name.is_null(), "parsed_name is still null?"); | |
| 1165 symbolHandle h_name (THREAD, k->name()); | |
| 1166 Handle h_loader (THREAD, k->class_loader()); | |
| 1167 | |
| 1168 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 1169 | |
| 1170 oop check = find_class_or_placeholder(parsed_name, class_loader); | |
| 1171 assert(check == k(), "should be present in the dictionary"); | |
| 1172 | |
| 1173 oop check2 = find_class_or_placeholder(h_name, h_loader); | |
| 1174 assert(check == check2, "name inconsistancy in SystemDictionary"); | |
| 1175 } | |
| 1176 } ); | |
| 1177 | |
| 1178 return k(); | |
| 1179 } | |
| 1180 | |
| 1181 | |
| 1182 void SystemDictionary::set_shared_dictionary(HashtableBucket* t, int length, | |
| 1183 int number_of_entries) { | |
| 1184 assert(length == _nof_buckets * sizeof(HashtableBucket), | |
| 1185 "bad shared dictionary size."); | |
| 1186 _shared_dictionary = new Dictionary(_nof_buckets, t, number_of_entries); | |
| 1187 } | |
| 1188 | |
| 1189 | |
| 1190 // If there is a shared dictionary, then find the entry for the | |
| 1191 // given shared system class, if any. | |
| 1192 | |
| 1193 klassOop SystemDictionary::find_shared_class(symbolHandle class_name) { | |
| 1194 if (shared_dictionary() != NULL) { | |
| 1195 unsigned int d_hash = dictionary()->compute_hash(class_name, Handle()); | |
| 1196 int d_index = dictionary()->hash_to_index(d_hash); | |
| 1197 return shared_dictionary()->find_shared_class(d_index, d_hash, class_name); | |
| 1198 } else { | |
| 1199 return NULL; | |
| 1200 } | |
| 1201 } | |
| 1202 | |
| 1203 | |
| 1204 // Load a class from the shared spaces (found through the shared system | |
| 1205 // dictionary). Force the superclass and all interfaces to be loaded. | |
| 1206 // Update the class definition to include sibling classes and no | |
| 1207 // subclasses (yet). [Classes in the shared space are not part of the | |
| 1208 // object hierarchy until loaded.] | |
| 1209 | |
| 1210 instanceKlassHandle SystemDictionary::load_shared_class( | |
| 1211 symbolHandle class_name, Handle class_loader, TRAPS) { | |
| 1212 instanceKlassHandle ik (THREAD, find_shared_class(class_name)); | |
| 1213 return load_shared_class(ik, class_loader, THREAD); | |
| 1214 } | |
| 1215 | |
| 1216 // Note well! Changes to this method may affect oop access order | |
| 1217 // in the shared archive. Please take care to not make changes that | |
| 1218 // adversely affect cold start time by changing the oop access order | |
| 1219 // that is specified in dump.cpp MarkAndMoveOrderedReadOnly and | |
| 1220 // MarkAndMoveOrderedReadWrite closures. | |
| 1221 instanceKlassHandle SystemDictionary::load_shared_class( | |
| 1222 instanceKlassHandle ik, Handle class_loader, TRAPS) { | |
| 1223 assert(class_loader.is_null(), "non-null classloader for shared class?"); | |
| 1224 if (ik.not_null()) { | |
| 1225 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
| 1226 symbolHandle class_name(THREAD, ik->name()); | |
| 1227 | |
| 1228 // Found the class, now load the superclass and interfaces. If they | |
| 1229 // are shared, add them to the main system dictionary and reset | |
| 1230 // their hierarchy references (supers, subs, and interfaces). | |
| 1231 | |
| 1232 if (ik->super() != NULL) { | |
| 1233 symbolHandle cn(THREAD, ik->super()->klass_part()->name()); | |
| 1234 resolve_super_or_fail(class_name, cn, | |
| 1235 class_loader, Handle(), true, CHECK_(nh)); | |
| 1236 } | |
| 1237 | |
| 1238 objArrayHandle interfaces (THREAD, ik->local_interfaces()); | |
| 1239 int num_interfaces = interfaces->length(); | |
| 1240 for (int index = 0; index < num_interfaces; index++) { | |
| 1241 klassOop k = klassOop(interfaces->obj_at(index)); | |
| 1242 | |
| 1243 // Note: can not use instanceKlass::cast here because | |
| 1244 // interfaces' instanceKlass's C++ vtbls haven't been | |
| 1245 // reinitialized yet (they will be once the interface classes | |
| 1246 // are loaded) | |
| 1247 symbolHandle name (THREAD, k->klass_part()->name()); | |
| 1248 resolve_super_or_fail(class_name, name, class_loader, Handle(), false, CHECK_(nh)); | |
| 1249 } | |
| 1250 | |
| 1251 // Adjust methods to recover missing data. They need addresses for | |
| 1252 // interpreter entry points and their default native method address | |
| 1253 // must be reset. | |
| 1254 | |
| 1255 // Updating methods must be done under a lock so multiple | |
| 1256 // threads don't update these in parallel | |
| 1257 // Shared classes are all currently loaded by the bootstrap | |
| 1258 // classloader, so this will never cause a deadlock on | |
| 1259 // a custom class loader lock. | |
| 1260 | |
| 1261 { | |
| 1262 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
| 1263 check_loader_lock_contention(lockObject, THREAD); | |
| 1264 ObjectLocker ol(lockObject, THREAD, true); | |
| 1265 | |
| 1266 objArrayHandle methods (THREAD, ik->methods()); | |
| 1267 int num_methods = methods->length(); | |
| 1268 for (int index2 = 0; index2 < num_methods; ++index2) { | |
| 1269 methodHandle m(THREAD, methodOop(methods->obj_at(index2))); | |
| 1270 m()->link_method(m, CHECK_(nh)); | |
| 1271 } | |
| 1272 } | |
| 1273 | |
| 1274 if (TraceClassLoading) { | |
| 1275 ResourceMark rm; | |
| 1276 tty->print("[Loaded %s", ik->external_name()); | |
| 1277 tty->print(" from shared objects file"); | |
| 1278 tty->print_cr("]"); | |
| 1279 } | |
| 1280 // notify a class loaded from shared object | |
| 1281 ClassLoadingService::notify_class_loaded(instanceKlass::cast(ik()), | |
| 1282 true /* shared class */); | |
| 1283 } | |
| 1284 return ik; | |
| 1285 } | |
| 1286 | |
| 1287 #ifdef KERNEL | |
| 1288 // Some classes on the bootstrap class path haven't been installed on the | |
| 1289 // system yet. Call the DownloadManager method to make them appear in the | |
| 1290 // bootstrap class path and try again to load the named class. | |
| 1291 // Note that with delegation class loaders all classes in another loader will | |
| 1292 // first try to call this so it'd better be fast!! | |
| 1293 static instanceKlassHandle download_and_retry_class_load( | |
| 1294 symbolHandle class_name, | |
| 1295 TRAPS) { | |
| 1296 | |
| 1297 klassOop dlm = SystemDictionary::sun_jkernel_DownloadManager_klass(); | |
| 1298 instanceKlassHandle nk; | |
| 1299 | |
| 1300 // If download manager class isn't loaded just return. | |
| 1301 if (dlm == NULL) return nk; | |
| 1302 | |
| 1303 { HandleMark hm(THREAD); | |
| 1304 ResourceMark rm(THREAD); | |
| 1305 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nk)); | |
| 1306 Handle class_string = java_lang_String::externalize_classname(s, CHECK_(nk)); | |
| 1307 | |
| 1308 // return value | |
| 1309 JavaValue result(T_OBJECT); | |
| 1310 | |
| 1311 // Call the DownloadManager. We assume that it has a lock because | |
| 1312 // multiple classes could be not found and downloaded at the same time. | |
| 1313 // class sun.misc.DownloadManager; | |
| 1314 // public static String getBootClassPathEntryForClass(String className); | |
| 1315 JavaCalls::call_static(&result, | |
| 1316 KlassHandle(THREAD, dlm), | |
| 1317 vmSymbolHandles::getBootClassPathEntryForClass_name(), | |
| 1318 vmSymbolHandles::string_string_signature(), | |
| 1319 class_string, | |
| 1320 CHECK_(nk)); | |
| 1321 | |
| 1322 // Get result.string and add to bootclasspath | |
| 1323 assert(result.get_type() == T_OBJECT, "just checking"); | |
| 1324 oop obj = (oop) result.get_jobject(); | |
| 1325 if (obj == NULL) { return nk; } | |
| 1326 | |
|
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1327 Handle h_obj(THREAD, obj); |
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1328 char* new_class_name = java_lang_String::as_platform_dependent_str(h_obj, |
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1329 CHECK_(nk)); |
| 0 | 1330 |
| 1331 // lock the loader | |
| 1332 // we use this lock because JVMTI does. | |
| 1333 Handle loader_lock(THREAD, SystemDictionary::system_loader_lock()); | |
| 1334 | |
| 1335 ObjectLocker ol(loader_lock, THREAD); | |
| 1336 // add the file to the bootclasspath | |
| 1337 ClassLoader::update_class_path_entry_list(new_class_name, true); | |
| 1338 } // end HandleMark | |
| 1339 | |
| 1340 if (TraceClassLoading) { | |
| 1341 ClassLoader::print_bootclasspath(); | |
| 1342 } | |
| 1343 return ClassLoader::load_classfile(class_name, CHECK_(nk)); | |
| 1344 } | |
| 1345 #endif // KERNEL | |
| 1346 | |
| 1347 | |
| 1348 instanceKlassHandle SystemDictionary::load_instance_class(symbolHandle class_name, Handle class_loader, TRAPS) { | |
| 1349 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
| 1350 if (class_loader.is_null()) { | |
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1351 |
| 0 | 1352 // Search the shared system dictionary for classes preloaded into the |
| 1353 // shared spaces. | |
| 1354 instanceKlassHandle k; | |
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1355 { |
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1356 PerfTraceTime vmtimer(ClassLoader::perf_shared_classload_time()); |
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1357 k = load_shared_class(class_name, class_loader, THREAD); |
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1358 } |
| 0 | 1359 |
| 1360 if (k.is_null()) { | |
| 1361 // Use VM class loader | |
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1362 PerfTraceTime vmtimer(ClassLoader::perf_sys_classload_time()); |
| 0 | 1363 k = ClassLoader::load_classfile(class_name, CHECK_(nh)); |
| 1364 } | |
| 1365 | |
| 1366 #ifdef KERNEL | |
| 1367 // If the VM class loader has failed to load the class, call the | |
| 1368 // DownloadManager class to make it magically appear on the classpath | |
| 1369 // and try again. This is only configured with the Kernel VM. | |
| 1370 if (k.is_null()) { | |
| 1371 k = download_and_retry_class_load(class_name, CHECK_(nh)); | |
| 1372 } | |
| 1373 #endif // KERNEL | |
| 1374 | |
| 514 | 1375 // find_or_define_instance_class may return a different instanceKlass |
| 0 | 1376 if (!k.is_null()) { |
| 1377 k = find_or_define_instance_class(class_name, class_loader, k, CHECK_(nh)); | |
| 1378 } | |
| 1379 return k; | |
| 1380 } else { | |
| 1381 // Use user specified class loader to load class. Call loadClass operation on class_loader. | |
| 1382 ResourceMark rm(THREAD); | |
| 1383 | |
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1384 assert(THREAD->is_Java_thread(), "must be a JavaThread"); |
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1385 JavaThread* jt = (JavaThread*) THREAD; |
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1386 |
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1387 PerfClassTraceTime vmtimer(ClassLoader::perf_app_classload_time(), |
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1388 ClassLoader::perf_app_classload_selftime(), |
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1389 ClassLoader::perf_app_classload_count(), |
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1390 jt->get_thread_stat()->perf_recursion_counts_addr(), |
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1391 jt->get_thread_stat()->perf_timers_addr(), |
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1392 PerfClassTraceTime::CLASS_LOAD); |
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1393 |
| 0 | 1394 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nh)); |
| 1395 // Translate to external class name format, i.e., convert '/' chars to '.' | |
| 1396 Handle string = java_lang_String::externalize_classname(s, CHECK_(nh)); | |
| 1397 | |
| 1398 JavaValue result(T_OBJECT); | |
| 1399 | |
| 1142 | 1400 KlassHandle spec_klass (THREAD, SystemDictionary::ClassLoader_klass()); |
| 0 | 1401 |
| 514 | 1402 // Call public unsynchronized loadClass(String) directly for all class loaders |
| 1403 // for parallelCapable class loaders. JDK >=7, loadClass(String, boolean) will | |
| 1404 // acquire a class-name based lock rather than the class loader object lock. | |
| 1405 // JDK < 7 already acquire the class loader lock in loadClass(String, boolean), | |
| 1406 // so the call to loadClassInternal() was not required. | |
| 1407 // | |
| 1408 // UnsyncloadClass flag means both call loadClass(String) and do | |
| 1409 // not acquire the class loader lock even for class loaders that are | |
| 1410 // not parallelCapable. This was a risky transitional | |
| 1411 // flag for diagnostic purposes only. It is risky to call | |
| 0 | 1412 // custom class loaders without synchronization. |
| 1413 // WARNING If a custom class loader does NOT synchronizer findClass, or callers of | |
| 514 | 1414 // findClass, the UnsyncloadClass flag risks unexpected timing bugs in the field. |
| 0 | 1415 // Do NOT assume this will be supported in future releases. |
| 514 | 1416 // |
| 1417 // Added MustCallLoadClassInternal in case we discover in the field | |
| 1418 // a customer that counts on this call | |
| 1419 if (MustCallLoadClassInternal && has_loadClassInternal()) { | |
| 0 | 1420 JavaCalls::call_special(&result, |
| 1421 class_loader, | |
| 1422 spec_klass, | |
| 1423 vmSymbolHandles::loadClassInternal_name(), | |
| 1424 vmSymbolHandles::string_class_signature(), | |
| 1425 string, | |
| 1426 CHECK_(nh)); | |
| 1427 } else { | |
| 1428 JavaCalls::call_virtual(&result, | |
| 1429 class_loader, | |
| 1430 spec_klass, | |
| 1431 vmSymbolHandles::loadClass_name(), | |
| 1432 vmSymbolHandles::string_class_signature(), | |
| 1433 string, | |
| 1434 CHECK_(nh)); | |
| 1435 } | |
| 1436 | |
| 1437 assert(result.get_type() == T_OBJECT, "just checking"); | |
| 1438 oop obj = (oop) result.get_jobject(); | |
| 1439 | |
| 1440 // Primitive classes return null since forName() can not be | |
| 1441 // used to obtain any of the Class objects representing primitives or void | |
| 1442 if ((obj != NULL) && !(java_lang_Class::is_primitive(obj))) { | |
| 1443 instanceKlassHandle k = | |
| 1444 instanceKlassHandle(THREAD, java_lang_Class::as_klassOop(obj)); | |
| 1445 // For user defined Java class loaders, check that the name returned is | |
| 1446 // the same as that requested. This check is done for the bootstrap | |
| 1447 // loader when parsing the class file. | |
| 1448 if (class_name() == k->name()) { | |
| 1449 return k; | |
| 1450 } | |
| 1451 } | |
| 1452 // Class is not found or has the wrong name, return NULL | |
| 1453 return nh; | |
| 1454 } | |
| 1455 } | |
| 1456 | |
| 1457 void SystemDictionary::define_instance_class(instanceKlassHandle k, TRAPS) { | |
| 1458 | |
| 1459 Handle class_loader_h(THREAD, k->class_loader()); | |
| 1460 | |
| 514 | 1461 // for bootstrap and other parallel classloaders don't acquire lock, |
| 1462 // use placeholder token | |
| 1463 // If a parallelCapable class loader calls define_instance_class instead of | |
| 1464 // find_or_define_instance_class to get here, we have a timing | |
| 1465 // hole with systemDictionary updates and check_constraints | |
| 1466 if (!class_loader_h.is_null() && !is_parallelCapable(class_loader_h)) { | |
| 0 | 1467 assert(ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, |
| 1468 compute_loader_lock_object(class_loader_h, THREAD)), | |
| 1469 "define called without lock"); | |
| 1470 } | |
| 1471 | |
| 1472 // Check class-loading constraints. Throw exception if violation is detected. | |
| 1473 // Grabs and releases SystemDictionary_lock | |
| 1474 // The check_constraints/find_class call and update_dictionary sequence | |
| 1475 // must be "atomic" for a specific class/classloader pair so we never | |
| 1476 // define two different instanceKlasses for that class/classloader pair. | |
| 1477 // Existing classloaders will call define_instance_class with the | |
| 1478 // classloader lock held | |
| 1479 // Parallel classloaders will call find_or_define_instance_class | |
| 1480 // which will require a token to perform the define class | |
| 1481 symbolHandle name_h(THREAD, k->name()); | |
| 1482 unsigned int d_hash = dictionary()->compute_hash(name_h, class_loader_h); | |
| 1483 int d_index = dictionary()->hash_to_index(d_hash); | |
| 1484 check_constraints(d_index, d_hash, k, class_loader_h, true, CHECK); | |
| 1485 | |
| 1486 // Register class just loaded with class loader (placed in Vector) | |
| 1487 // Note we do this before updating the dictionary, as this can | |
| 1488 // fail with an OutOfMemoryError (if it does, we will *not* put this | |
| 1489 // class in the dictionary and will not update the class hierarchy). | |
| 1490 if (k->class_loader() != NULL) { | |
| 1491 methodHandle m(THREAD, Universe::loader_addClass_method()); | |
| 1492 JavaValue result(T_VOID); | |
| 1493 JavaCallArguments args(class_loader_h); | |
| 1494 args.push_oop(Handle(THREAD, k->java_mirror())); | |
| 1495 JavaCalls::call(&result, m, &args, CHECK); | |
| 1496 } | |
| 1497 | |
| 1498 // Add the new class. We need recompile lock during update of CHA. | |
| 1499 { | |
| 1500 unsigned int p_hash = placeholders()->compute_hash(name_h, class_loader_h); | |
| 1501 int p_index = placeholders()->hash_to_index(p_hash); | |
| 1502 | |
| 1503 MutexLocker mu_r(Compile_lock, THREAD); | |
| 1504 | |
| 1505 // Add to class hierarchy, initialize vtables, and do possible | |
| 1506 // deoptimizations. | |
| 1507 add_to_hierarchy(k, CHECK); // No exception, but can block | |
| 1508 | |
| 1509 // Add to systemDictionary - so other classes can see it. | |
| 1510 // Grabs and releases SystemDictionary_lock | |
| 1511 update_dictionary(d_index, d_hash, p_index, p_hash, | |
| 1512 k, class_loader_h, THREAD); | |
| 1513 } | |
| 1514 k->eager_initialize(THREAD); | |
| 1515 | |
| 1516 // notify jvmti | |
| 1517 if (JvmtiExport::should_post_class_load()) { | |
| 1518 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); | |
| 1519 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); | |
| 1520 | |
| 1521 } | |
| 1522 } | |
| 1523 | |
| 1524 // Support parallel classloading | |
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1525 // All parallel class loaders, including bootstrap classloader |
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1526 // lock a placeholder entry for this class/class_loader pair |
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1527 // to allow parallel defines of different classes for this class loader |
| 514 | 1528 // With AllowParallelDefine flag==true, in case they do not synchronize around |
| 1529 // FindLoadedClass/DefineClass, calls, we check for parallel | |
| 0 | 1530 // loading for them, wait if a defineClass is in progress |
| 1531 // and return the initial requestor's results | |
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1532 // This flag does not apply to the bootstrap classloader. |
| 514 | 1533 // With AllowParallelDefine flag==false, call through to define_instance_class |
| 1534 // which will throw LinkageError: duplicate class definition. | |
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1535 // False is the requested default. |
| 0 | 1536 // For better performance, the class loaders should synchronize |
| 514 | 1537 // findClass(), i.e. FindLoadedClass/DefineClassIfAbsent or they |
| 0 | 1538 // potentially waste time reading and parsing the bytestream. |
| 1539 // Note: VM callers should ensure consistency of k/class_name,class_loader | |
| 1540 instanceKlassHandle SystemDictionary::find_or_define_instance_class(symbolHandle class_name, Handle class_loader, instanceKlassHandle k, TRAPS) { | |
| 1541 | |
| 1542 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
| 515 | 1543 symbolHandle name_h(THREAD, k->name()); // passed in class_name may be null |
| 0 | 1544 |
| 515 | 1545 unsigned int d_hash = dictionary()->compute_hash(name_h, class_loader); |
| 0 | 1546 int d_index = dictionary()->hash_to_index(d_hash); |
| 1547 | |
| 1548 // Hold SD lock around find_class and placeholder creation for DEFINE_CLASS | |
| 515 | 1549 unsigned int p_hash = placeholders()->compute_hash(name_h, class_loader); |
| 0 | 1550 int p_index = placeholders()->hash_to_index(p_hash); |
| 1551 PlaceholderEntry* probe; | |
| 1552 | |
| 1553 { | |
| 1554 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 1555 // First check if class already defined | |
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1556 if (UnsyncloadClass || (is_parallelDefine(class_loader))) { |
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1557 klassOop check = find_class(d_index, d_hash, name_h, class_loader); |
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1558 if (check != NULL) { |
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1559 return(instanceKlassHandle(THREAD, check)); |
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1560 } |
| 0 | 1561 } |
| 1562 | |
| 1563 // Acquire define token for this class/classloader | |
| 1564 symbolHandle nullsymbolHandle; | |
| 515 | 1565 probe = placeholders()->find_and_add(p_index, p_hash, name_h, class_loader, PlaceholderTable::DEFINE_CLASS, nullsymbolHandle, THREAD); |
| 514 | 1566 // Wait if another thread defining in parallel |
| 1567 // All threads wait - even those that will throw duplicate class: otherwise | |
| 1568 // caller is surprised by LinkageError: duplicate, but findLoadedClass fails | |
| 1569 // if other thread has not finished updating dictionary | |
| 1570 while (probe->definer() != NULL) { | |
| 1571 SystemDictionary_lock->wait(); | |
| 1572 } | |
| 1573 // Only special cases allow parallel defines and can use other thread's results | |
| 1574 // Other cases fall through, and may run into duplicate defines | |
| 1575 // caught by finding an entry in the SystemDictionary | |
|
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1576 if ((UnsyncloadClass || is_parallelDefine(class_loader)) && (probe->instanceKlass() != NULL)) { |
| 0 | 1577 probe->remove_seen_thread(THREAD, PlaceholderTable::DEFINE_CLASS); |
| 515 | 1578 placeholders()->find_and_remove(p_index, p_hash, name_h, class_loader, THREAD); |
| 514 | 1579 SystemDictionary_lock->notify_all(); |
| 0 | 1580 #ifdef ASSERT |
| 515 | 1581 klassOop check = find_class(d_index, d_hash, name_h, class_loader); |
| 514 | 1582 assert(check != NULL, "definer missed recording success"); |
| 0 | 1583 #endif |
| 514 | 1584 return(instanceKlassHandle(THREAD, probe->instanceKlass())); |
| 0 | 1585 } else { |
| 514 | 1586 // This thread will define the class (even if earlier thread tried and had an error) |
| 1587 probe->set_definer(THREAD); | |
| 0 | 1588 } |
| 1589 } | |
| 1590 | |
| 1591 define_instance_class(k, THREAD); | |
| 1592 | |
| 1593 Handle linkage_exception = Handle(); // null handle | |
| 1594 | |
| 1595 // definer must notify any waiting threads | |
| 1596 { | |
| 1597 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 515 | 1598 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name_h, class_loader); |
| 0 | 1599 assert(probe != NULL, "DEFINE_CLASS placeholder lost?"); |
| 1600 if (probe != NULL) { | |
| 1601 if (HAS_PENDING_EXCEPTION) { | |
| 1602 linkage_exception = Handle(THREAD,PENDING_EXCEPTION); | |
| 1603 CLEAR_PENDING_EXCEPTION; | |
| 1604 } else { | |
| 1605 probe->set_instanceKlass(k()); | |
| 1606 } | |
| 1607 probe->set_definer(NULL); | |
| 1608 probe->remove_seen_thread(THREAD, PlaceholderTable::DEFINE_CLASS); | |
| 515 | 1609 placeholders()->find_and_remove(p_index, p_hash, name_h, class_loader, THREAD); |
| 0 | 1610 SystemDictionary_lock->notify_all(); |
| 1611 } | |
| 1612 } | |
| 1613 | |
| 1614 // Can't throw exception while holding lock due to rank ordering | |
| 1615 if (linkage_exception() != NULL) { | |
| 1616 THROW_OOP_(linkage_exception(), nh); // throws exception and returns | |
| 1617 } | |
| 1618 | |
| 1619 return k; | |
| 1620 } | |
| 1621 Handle SystemDictionary::compute_loader_lock_object(Handle class_loader, TRAPS) { | |
| 1622 // If class_loader is NULL we synchronize on _system_loader_lock_obj | |
| 1623 if (class_loader.is_null()) { | |
| 1624 return Handle(THREAD, _system_loader_lock_obj); | |
| 1625 } else { | |
| 1626 return class_loader; | |
| 1627 } | |
| 1628 } | |
| 1629 | |
| 1630 // This method is added to check how often we have to wait to grab loader | |
| 1631 // lock. The results are being recorded in the performance counters defined in | |
| 1632 // ClassLoader::_sync_systemLoaderLockContentionRate and | |
| 1633 // ClassLoader::_sync_nonSystemLoaderLockConteionRate. | |
| 1634 void SystemDictionary::check_loader_lock_contention(Handle loader_lock, TRAPS) { | |
| 1635 if (!UsePerfData) { | |
| 1636 return; | |
| 1637 } | |
| 1638 | |
| 1639 assert(!loader_lock.is_null(), "NULL lock object"); | |
| 1640 | |
| 1641 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader_lock) | |
| 1642 == ObjectSynchronizer::owner_other) { | |
| 1643 // contention will likely happen, so increment the corresponding | |
| 1644 // contention counter. | |
| 1645 if (loader_lock() == _system_loader_lock_obj) { | |
| 1646 ClassLoader::sync_systemLoaderLockContentionRate()->inc(); | |
| 1647 } else { | |
| 1648 ClassLoader::sync_nonSystemLoaderLockContentionRate()->inc(); | |
| 1649 } | |
| 1650 } | |
| 1651 } | |
| 1652 | |
| 1653 // ---------------------------------------------------------------------------- | |
| 1654 // Lookup | |
| 1655 | |
| 1656 klassOop SystemDictionary::find_class(int index, unsigned int hash, | |
| 1657 symbolHandle class_name, | |
| 1658 Handle class_loader) { | |
| 1659 assert_locked_or_safepoint(SystemDictionary_lock); | |
| 1660 assert (index == dictionary()->index_for(class_name, class_loader), | |
| 1661 "incorrect index?"); | |
| 1662 | |
| 1663 klassOop k = dictionary()->find_class(index, hash, class_name, class_loader); | |
| 1664 return k; | |
| 1665 } | |
| 1666 | |
| 1667 | |
| 1668 // Basic find on classes in the midst of being loaded | |
| 1669 symbolOop SystemDictionary::find_placeholder(int index, unsigned int hash, | |
| 1670 symbolHandle class_name, | |
| 1671 Handle class_loader) { | |
| 1672 assert_locked_or_safepoint(SystemDictionary_lock); | |
| 1673 | |
| 1674 return placeholders()->find_entry(index, hash, class_name, class_loader); | |
| 1675 } | |
| 1676 | |
| 1677 | |
| 1678 // Used for assertions and verification only | |
| 1679 oop SystemDictionary::find_class_or_placeholder(symbolHandle class_name, | |
| 1680 Handle class_loader) { | |
| 1681 #ifndef ASSERT | |
| 1682 guarantee(VerifyBeforeGC || | |
| 1683 VerifyDuringGC || | |
| 1684 VerifyBeforeExit || | |
| 1685 VerifyAfterGC, "too expensive"); | |
| 1686 #endif | |
| 1687 assert_locked_or_safepoint(SystemDictionary_lock); | |
| 1688 symbolOop class_name_ = class_name(); | |
| 1689 oop class_loader_ = class_loader(); | |
| 1690 | |
| 1691 // First look in the loaded class array | |
| 1692 unsigned int d_hash = dictionary()->compute_hash(class_name, class_loader); | |
| 1693 int d_index = dictionary()->hash_to_index(d_hash); | |
| 1694 oop lookup = find_class(d_index, d_hash, class_name, class_loader); | |
| 1695 | |
| 1696 if (lookup == NULL) { | |
| 1697 // Next try the placeholders | |
| 1698 unsigned int p_hash = placeholders()->compute_hash(class_name,class_loader); | |
| 1699 int p_index = placeholders()->hash_to_index(p_hash); | |
| 1700 lookup = find_placeholder(p_index, p_hash, class_name, class_loader); | |
| 1701 } | |
| 1702 | |
| 1703 return lookup; | |
| 1704 } | |
| 1705 | |
| 1706 | |
| 1707 // Get the next class in the diictionary. | |
| 1708 klassOop SystemDictionary::try_get_next_class() { | |
| 1709 return dictionary()->try_get_next_class(); | |
| 1710 } | |
| 1711 | |
| 1712 | |
| 1713 // ---------------------------------------------------------------------------- | |
| 1714 // Update hierachy. This is done before the new klass has been added to the SystemDictionary. The Recompile_lock | |
| 1715 // is held, to ensure that the compiler is not using the class hierachy, and that deoptimization will kick in | |
| 1716 // before a new class is used. | |
| 1717 | |
| 1718 void SystemDictionary::add_to_hierarchy(instanceKlassHandle k, TRAPS) { | |
| 1719 assert(k.not_null(), "just checking"); | |
| 1720 // Link into hierachy. Make sure the vtables are initialized before linking into | |
| 1721 k->append_to_sibling_list(); // add to superklass/sibling list | |
| 1722 k->process_interfaces(THREAD); // handle all "implements" declarations | |
| 1723 k->set_init_state(instanceKlass::loaded); | |
| 1724 // Now flush all code that depended on old class hierarchy. | |
| 1725 // Note: must be done *after* linking k into the hierarchy (was bug 12/9/97) | |
| 1726 // Also, first reinitialize vtable because it may have gotten out of synch | |
| 1727 // while the new class wasn't connected to the class hierarchy. | |
| 1728 Universe::flush_dependents_on(k); | |
| 1729 } | |
| 1730 | |
| 1731 | |
| 1732 // ---------------------------------------------------------------------------- | |
| 1733 // GC support | |
| 1734 | |
| 1735 // Following roots during mark-sweep is separated in two phases. | |
| 1736 // | |
| 1737 // The first phase follows preloaded classes and all other system | |
| 1738 // classes, since these will never get unloaded anyway. | |
| 1739 // | |
| 1740 // The second phase removes (unloads) unreachable classes from the | |
| 1741 // system dictionary and follows the remaining classes' contents. | |
| 1742 | |
| 1743 void SystemDictionary::always_strong_oops_do(OopClosure* blk) { | |
| 1744 // Follow preloaded classes/mirrors and system loader object | |
| 1745 blk->do_oop(&_java_system_loader); | |
| 1746 preloaded_oops_do(blk); | |
| 1747 always_strong_classes_do(blk); | |
| 1748 } | |
| 1749 | |
| 1750 | |
| 1751 void SystemDictionary::always_strong_classes_do(OopClosure* blk) { | |
| 1752 // Follow all system classes and temporary placeholders in dictionary | |
| 1753 dictionary()->always_strong_classes_do(blk); | |
| 1754 | |
| 1755 // Placeholders. These are *always* strong roots, as they | |
| 1756 // represent classes we're actively loading. | |
| 1757 placeholders_do(blk); | |
| 1758 | |
| 710 | 1759 // Visit extra methods |
| 1903 | 1760 invoke_method_table()->oops_do(blk); |
| 710 | 1761 |
| 0 | 1762 // Loader constraints. We must keep the symbolOop used in the name alive. |
| 1763 constraints()->always_strong_classes_do(blk); | |
| 1764 | |
| 1765 // Resolution errors keep the symbolOop for the error alive | |
| 1766 resolution_errors()->always_strong_classes_do(blk); | |
| 1767 } | |
| 1768 | |
| 1769 | |
| 1770 void SystemDictionary::placeholders_do(OopClosure* blk) { | |
| 1771 placeholders()->oops_do(blk); | |
| 1772 } | |
| 1773 | |
| 1774 | |
| 1775 bool SystemDictionary::do_unloading(BoolObjectClosure* is_alive) { | |
| 1776 bool result = dictionary()->do_unloading(is_alive); | |
| 1777 constraints()->purge_loader_constraints(is_alive); | |
| 1778 resolution_errors()->purge_resolution_errors(is_alive); | |
| 1779 return result; | |
| 1780 } | |
| 1781 | |
| 1782 | |
| 1783 // The mirrors are scanned by shared_oops_do() which is | |
| 1784 // not called by oops_do(). In order to process oops in | |
| 1785 // a necessary order, shared_oops_do() is call by | |
| 1786 // Universe::oops_do(). | |
| 1787 void SystemDictionary::oops_do(OopClosure* f) { | |
| 1788 // Adjust preloaded classes and system loader object | |
| 1789 f->do_oop(&_java_system_loader); | |
| 1790 preloaded_oops_do(f); | |
| 1791 | |
| 1792 lazily_loaded_oops_do(f); | |
| 1793 | |
| 1794 // Adjust dictionary | |
| 1795 dictionary()->oops_do(f); | |
| 1796 | |
| 710 | 1797 // Visit extra methods |
| 1903 | 1798 invoke_method_table()->oops_do(f); |
| 710 | 1799 |
| 0 | 1800 // Partially loaded classes |
| 1801 placeholders()->oops_do(f); | |
| 1802 | |
| 1803 // Adjust constraint table | |
| 1804 constraints()->oops_do(f); | |
| 1805 | |
| 1806 // Adjust resolution error table | |
| 1807 resolution_errors()->oops_do(f); | |
| 1808 } | |
| 1809 | |
| 1810 | |
| 1811 void SystemDictionary::preloaded_oops_do(OopClosure* f) { | |
|
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1812 f->do_oop((oop*) &wk_klass_name_limits[0]); |
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1813 f->do_oop((oop*) &wk_klass_name_limits[1]); |
| 0 | 1814 |
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1815 for (int k = (int)FIRST_WKID; k < (int)WKID_LIMIT; k++) { |
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1816 f->do_oop((oop*) &_well_known_klasses[k]); |
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1817 } |
| 0 | 1818 |
| 1819 { | |
| 1820 for (int i = 0; i < T_VOID+1; i++) { | |
| 1821 if (_box_klasses[i] != NULL) { | |
| 1822 assert(i >= T_BOOLEAN, "checking"); | |
| 1823 f->do_oop((oop*) &_box_klasses[i]); | |
| 1824 } | |
| 1825 } | |
| 1826 } | |
| 1827 | |
| 1828 // The basic type mirrors would have already been processed in | |
| 1829 // Universe::oops_do(), via a call to shared_oops_do(), so should | |
| 1830 // not be processed again. | |
| 1831 | |
| 1832 f->do_oop((oop*) &_system_loader_lock_obj); | |
| 1833 FilteredFieldsMap::klasses_oops_do(f); | |
| 1834 } | |
| 1835 | |
| 1836 void SystemDictionary::lazily_loaded_oops_do(OopClosure* f) { | |
| 1837 f->do_oop((oop*) &_abstract_ownable_synchronizer_klass); | |
| 1838 } | |
| 1839 | |
| 1840 // Just the classes from defining class loaders | |
| 1841 // Don't iterate over placeholders | |
| 1842 void SystemDictionary::classes_do(void f(klassOop)) { | |
| 1843 dictionary()->classes_do(f); | |
| 1844 } | |
| 1845 | |
| 1846 // Added for initialize_itable_for_klass | |
| 1847 // Just the classes from defining class loaders | |
| 1848 // Don't iterate over placeholders | |
| 1849 void SystemDictionary::classes_do(void f(klassOop, TRAPS), TRAPS) { | |
| 1850 dictionary()->classes_do(f, CHECK); | |
| 1851 } | |
| 1852 | |
| 1853 // All classes, and their class loaders | |
| 1854 // Don't iterate over placeholders | |
| 1855 void SystemDictionary::classes_do(void f(klassOop, oop)) { | |
| 1856 dictionary()->classes_do(f); | |
| 1857 } | |
| 1858 | |
| 1859 // All classes, and their class loaders | |
| 1860 // (added for helpers that use HandleMarks and ResourceMarks) | |
| 1861 // Don't iterate over placeholders | |
| 1862 void SystemDictionary::classes_do(void f(klassOop, oop, TRAPS), TRAPS) { | |
| 1863 dictionary()->classes_do(f, CHECK); | |
| 1864 } | |
| 1865 | |
| 1866 void SystemDictionary::placeholders_do(void f(symbolOop, oop)) { | |
| 1867 placeholders()->entries_do(f); | |
| 1868 } | |
| 1869 | |
| 1870 void SystemDictionary::methods_do(void f(methodOop)) { | |
| 1871 dictionary()->methods_do(f); | |
| 1903 | 1872 invoke_method_table()->methods_do(f); |
| 0 | 1873 } |
| 1874 | |
| 1875 // ---------------------------------------------------------------------------- | |
| 1876 // Lazily load klasses | |
| 1877 | |
| 1878 void SystemDictionary::load_abstract_ownable_synchronizer_klass(TRAPS) { | |
| 1879 assert(JDK_Version::is_gte_jdk16x_version(), "Must be JDK 1.6 or later"); | |
| 1880 | |
| 1881 // if multiple threads calling this function, only one thread will load | |
| 1882 // the class. The other threads will find the loaded version once the | |
| 1883 // class is loaded. | |
| 1884 klassOop aos = _abstract_ownable_synchronizer_klass; | |
| 1885 if (aos == NULL) { | |
| 1886 klassOop k = resolve_or_fail(vmSymbolHandles::java_util_concurrent_locks_AbstractOwnableSynchronizer(), true, CHECK); | |
| 1887 // Force a fence to prevent any read before the write completes | |
| 1888 OrderAccess::fence(); | |
| 1889 _abstract_ownable_synchronizer_klass = k; | |
| 1890 } | |
| 1891 } | |
| 1892 | |
| 1893 // ---------------------------------------------------------------------------- | |
| 1894 // Initialization | |
| 1895 | |
| 1896 void SystemDictionary::initialize(TRAPS) { | |
| 1897 // Allocate arrays | |
| 1898 assert(dictionary() == NULL, | |
| 1899 "SystemDictionary should only be initialized once"); | |
| 1903 | 1900 _dictionary = new Dictionary(_nof_buckets); |
| 1901 _placeholders = new PlaceholderTable(_nof_buckets); | |
| 0 | 1902 _number_of_modifications = 0; |
| 1903 | 1903 _loader_constraints = new LoaderConstraintTable(_loader_constraint_size); |
| 1904 _resolution_errors = new ResolutionErrorTable(_resolution_error_size); | |
| 1905 _invoke_method_table = new SymbolPropertyTable(_invoke_method_size); | |
| 0 | 1906 |
| 1907 // Allocate private object used as system class loader lock | |
| 1908 _system_loader_lock_obj = oopFactory::new_system_objArray(0, CHECK); | |
| 1909 // Initialize basic classes | |
| 1910 initialize_preloaded_classes(CHECK); | |
| 1911 } | |
| 1912 | |
|
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1913 // Compact table of directions on the initialization of klasses: |
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1914 static const short wk_init_info[] = { |
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1915 #define WK_KLASS_INIT_INFO(name, symbol, option) \ |
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1916 ( ((int)vmSymbols::VM_SYMBOL_ENUM_NAME(symbol) \ |
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1917 << SystemDictionary::CEIL_LG_OPTION_LIMIT) \ |
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1918 | (int)SystemDictionary::option ), |
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1919 WK_KLASSES_DO(WK_KLASS_INIT_INFO) |
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1920 #undef WK_KLASS_INIT_INFO |
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1921 0 |
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1922 }; |
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1923 |
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1924 bool SystemDictionary::initialize_wk_klass(WKID id, int init_opt, TRAPS) { |
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1925 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1926 int info = wk_init_info[id - FIRST_WKID]; |
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1927 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1928 symbolHandle symbol = vmSymbolHandles::symbol_handle_at((vmSymbols::SID)sid); |
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1929 klassOop* klassp = &_well_known_klasses[id]; |
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1930 bool must_load = (init_opt < SystemDictionary::Opt); |
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1931 bool try_load = true; |
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1932 if (init_opt == SystemDictionary::Opt_Kernel) { |
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1933 #ifndef KERNEL |
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1934 try_load = false; |
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1935 #endif //KERNEL |
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1936 } |
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1937 if ((*klassp) == NULL && try_load) { |
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1938 if (must_load) { |
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1939 (*klassp) = resolve_or_fail(symbol, true, CHECK_0); // load required class |
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1940 } else { |
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1941 (*klassp) = resolve_or_null(symbol, CHECK_0); // load optional klass |
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1942 } |
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1943 } |
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1944 return ((*klassp) != NULL); |
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1945 } |
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1946 |
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1947 void SystemDictionary::initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS) { |
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1948 assert((int)start_id <= (int)limit_id, "IDs are out of order!"); |
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1949 for (int id = (int)start_id; id < (int)limit_id; id++) { |
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1950 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1951 int info = wk_init_info[id - FIRST_WKID]; |
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1952 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1953 int opt = (info & right_n_bits(CEIL_LG_OPTION_LIMIT)); |
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1954 |
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1955 initialize_wk_klass((WKID)id, opt, CHECK); |
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1956 |
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1957 // Update limits, so find_well_known_klass can be very fast: |
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1958 symbolOop s = vmSymbols::symbol_at((vmSymbols::SID)sid); |
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1959 if (wk_klass_name_limits[1] == NULL) { |
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1960 wk_klass_name_limits[0] = wk_klass_name_limits[1] = s; |
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1961 } else if (wk_klass_name_limits[1] < s) { |
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1962 wk_klass_name_limits[1] = s; |
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1963 } else if (wk_klass_name_limits[0] > s) { |
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1964 wk_klass_name_limits[0] = s; |
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1965 } |
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1966 } |
| 710 | 1967 |
| 1968 // move the starting value forward to the limit: | |
| 1969 start_id = limit_id; | |
|
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1970 } |
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1971 |
| 0 | 1972 |
| 1973 void SystemDictionary::initialize_preloaded_classes(TRAPS) { | |
| 1142 | 1974 assert(WK_KLASS(Object_klass) == NULL, "preloaded classes should only be initialized once"); |
| 0 | 1975 // Preload commonly used klasses |
|
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1976 WKID scan = FIRST_WKID; |
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1977 // first do Object, String, Class |
| 1142 | 1978 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Class_klass), scan, CHECK); |
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1979 |
| 1142 | 1980 debug_only(instanceKlass::verify_class_klass_nonstatic_oop_maps(WK_KLASS(Class_klass))); |
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1981 |
| 0 | 1982 // Fixup mirrors for classes loaded before java.lang.Class. |
| 1983 // These calls iterate over the objects currently in the perm gen | |
| 1984 // so calling them at this point is matters (not before when there | |
| 1985 // are fewer objects and not later after there are more objects | |
| 1986 // in the perm gen. | |
| 1987 Universe::initialize_basic_type_mirrors(CHECK); | |
| 1988 Universe::fixup_mirrors(CHECK); | |
| 1989 | |
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1990 // do a bunch more: |
| 1142 | 1991 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Reference_klass), scan, CHECK); |
| 0 | 1992 |
| 1993 // Preload ref klasses and set reference types | |
| 1142 | 1994 instanceKlass::cast(WK_KLASS(Reference_klass))->set_reference_type(REF_OTHER); |
| 1995 instanceRefKlass::update_nonstatic_oop_maps(WK_KLASS(Reference_klass)); | |
| 0 | 1996 |
| 1142 | 1997 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(PhantomReference_klass), scan, CHECK); |
| 1998 instanceKlass::cast(WK_KLASS(SoftReference_klass))->set_reference_type(REF_SOFT); | |
| 1999 instanceKlass::cast(WK_KLASS(WeakReference_klass))->set_reference_type(REF_WEAK); | |
| 2000 instanceKlass::cast(WK_KLASS(FinalReference_klass))->set_reference_type(REF_FINAL); | |
| 2001 instanceKlass::cast(WK_KLASS(PhantomReference_klass))->set_reference_type(REF_PHANTOM); | |
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2002 |
| 710 | 2003 WKID meth_group_start = WK_KLASS_ENUM_NAME(MethodHandle_klass); |
| 2004 WKID meth_group_end = WK_KLASS_ENUM_NAME(WrongMethodTypeException_klass); | |
| 2005 initialize_wk_klasses_until(meth_group_start, scan, CHECK); | |
| 2006 if (EnableMethodHandles) { | |
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2007 initialize_wk_klasses_through(meth_group_end, scan, CHECK); |
| 710 | 2008 } |
| 2009 if (_well_known_klasses[meth_group_start] == NULL) { | |
| 2010 // Skip the rest of the method handle classes, if MethodHandle is not loaded. | |
| 2011 scan = WKID(meth_group_end+1); | |
| 2012 } | |
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2013 WKID indy_group_start = WK_KLASS_ENUM_NAME(Linkage_klass); |
|
2001
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2014 WKID indy_group_end = WK_KLASS_ENUM_NAME(CallSite_klass); |
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2015 initialize_wk_klasses_until(indy_group_start, scan, CHECK); |
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2016 if (EnableInvokeDynamic) { |
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2017 initialize_wk_klasses_through(indy_group_end, scan, CHECK); |
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2018 } |
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2019 if (_well_known_klasses[indy_group_start] == NULL) { |
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2020 // Skip the rest of the dynamic typing classes, if Linkage is not loaded. |
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2021 scan = WKID(indy_group_end+1); |
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2022 } |
| 710 | 2023 |
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2024 initialize_wk_klasses_until(WKID_LIMIT, scan, CHECK); |
| 0 | 2025 |
| 1142 | 2026 _box_klasses[T_BOOLEAN] = WK_KLASS(Boolean_klass); |
| 2027 _box_klasses[T_CHAR] = WK_KLASS(Character_klass); | |
| 2028 _box_klasses[T_FLOAT] = WK_KLASS(Float_klass); | |
| 2029 _box_klasses[T_DOUBLE] = WK_KLASS(Double_klass); | |
| 2030 _box_klasses[T_BYTE] = WK_KLASS(Byte_klass); | |
| 2031 _box_klasses[T_SHORT] = WK_KLASS(Short_klass); | |
| 2032 _box_klasses[T_INT] = WK_KLASS(Integer_klass); | |
| 2033 _box_klasses[T_LONG] = WK_KLASS(Long_klass); | |
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2034 //_box_klasses[T_OBJECT] = WK_KLASS(object_klass); |
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2035 //_box_klasses[T_ARRAY] = WK_KLASS(object_klass); |
| 0 | 2036 |
| 2037 #ifdef KERNEL | |
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2038 if (sun_jkernel_DownloadManager_klass() == NULL) { |
| 0 | 2039 warning("Cannot find sun/jkernel/DownloadManager"); |
| 2040 } | |
| 2041 #endif // KERNEL | |
| 514 | 2042 |
| 0 | 2043 { // Compute whether we should use loadClass or loadClassInternal when loading classes. |
| 1142 | 2044 methodOop method = instanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::loadClassInternal_name(), vmSymbols::string_class_signature()); |
| 0 | 2045 _has_loadClassInternal = (method != NULL); |
| 2046 } | |
| 2047 { // Compute whether we should use checkPackageAccess or NOT | |
| 1142 | 2048 methodOop method = instanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::checkPackageAccess_name(), vmSymbols::class_protectiondomain_signature()); |
| 0 | 2049 _has_checkPackageAccess = (method != NULL); |
| 2050 } | |
| 2051 } | |
| 2052 | |
| 2053 // Tells if a given klass is a box (wrapper class, such as java.lang.Integer). | |
| 2054 // If so, returns the basic type it holds. If not, returns T_OBJECT. | |
| 2055 BasicType SystemDictionary::box_klass_type(klassOop k) { | |
| 2056 assert(k != NULL, ""); | |
| 2057 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { | |
| 2058 if (_box_klasses[i] == k) | |
| 2059 return (BasicType)i; | |
| 2060 } | |
| 2061 return T_OBJECT; | |
| 2062 } | |
| 2063 | |
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2064 KlassHandle SystemDictionaryHandles::box_klass(BasicType t) { |
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2065 if (t >= T_BOOLEAN && t <= T_VOID) |
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2066 return KlassHandle(&SystemDictionary::_box_klasses[t], true); |
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2067 else |
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2068 return KlassHandle(); |
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2069 } |
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2070 |
| 0 | 2071 // Constraints on class loaders. The details of the algorithm can be |
| 2072 // found in the OOPSLA'98 paper "Dynamic Class Loading in the Java | |
| 2073 // Virtual Machine" by Sheng Liang and Gilad Bracha. The basic idea is | |
| 2074 // that the system dictionary needs to maintain a set of contraints that | |
| 2075 // must be satisfied by all classes in the dictionary. | |
| 2076 // if defining is true, then LinkageError if already in systemDictionary | |
| 2077 // if initiating loader, then ok if instanceKlass matches existing entry | |
| 2078 | |
| 2079 void SystemDictionary::check_constraints(int d_index, unsigned int d_hash, | |
| 2080 instanceKlassHandle k, | |
| 2081 Handle class_loader, bool defining, | |
| 2082 TRAPS) { | |
| 2083 const char *linkage_error = NULL; | |
| 2084 { | |
| 2085 symbolHandle name (THREAD, k->name()); | |
| 2086 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 2087 | |
| 2088 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 2089 if (check != (klassOop)NULL) { | |
| 2090 // if different instanceKlass - duplicate class definition, | |
| 2091 // else - ok, class loaded by a different thread in parallel, | |
| 2092 // we should only have found it if it was done loading and ok to use | |
| 2093 // system dictionary only holds instance classes, placeholders | |
| 2094 // also holds array classes | |
| 2095 | |
| 2096 assert(check->klass_part()->oop_is_instance(), "noninstance in systemdictionary"); | |
| 2097 if ((defining == true) || (k() != check)) { | |
| 2098 linkage_error = "loader (instance of %s): attempted duplicate class " | |
| 2099 "definition for name: \"%s\""; | |
| 2100 } else { | |
| 2101 return; | |
| 2102 } | |
| 2103 } | |
| 2104 | |
| 2105 #ifdef ASSERT | |
| 2106 unsigned int p_hash = placeholders()->compute_hash(name, class_loader); | |
| 2107 int p_index = placeholders()->hash_to_index(p_hash); | |
| 2108 symbolOop ph_check = find_placeholder(p_index, p_hash, name, class_loader); | |
| 2109 assert(ph_check == NULL || ph_check == name(), "invalid symbol"); | |
| 2110 #endif | |
| 2111 | |
| 2112 if (linkage_error == NULL) { | |
| 2113 if (constraints()->check_or_update(k, class_loader, name) == false) { | |
| 2114 linkage_error = "loader constraint violation: loader (instance of %s)" | |
| 2115 " previously initiated loading for a different type with name \"%s\""; | |
| 2116 } | |
| 2117 } | |
| 2118 } | |
| 2119 | |
| 2120 // Throw error now if needed (cannot throw while holding | |
| 2121 // SystemDictionary_lock because of rank ordering) | |
| 2122 | |
| 2123 if (linkage_error) { | |
| 2124 ResourceMark rm(THREAD); | |
| 2125 const char* class_loader_name = loader_name(class_loader()); | |
| 2126 char* type_name = k->name()->as_C_string(); | |
| 2127 size_t buflen = strlen(linkage_error) + strlen(class_loader_name) + | |
| 2128 strlen(type_name); | |
| 2129 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
| 2130 jio_snprintf(buf, buflen, linkage_error, class_loader_name, type_name); | |
| 2131 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); | |
| 2132 } | |
| 2133 } | |
| 2134 | |
| 2135 | |
| 2136 // Update system dictionary - done after check_constraint and add_to_hierachy | |
| 2137 // have been called. | |
| 2138 void SystemDictionary::update_dictionary(int d_index, unsigned int d_hash, | |
| 2139 int p_index, unsigned int p_hash, | |
| 2140 instanceKlassHandle k, | |
| 2141 Handle class_loader, | |
| 2142 TRAPS) { | |
| 2143 // Compile_lock prevents systemDictionary updates during compilations | |
| 2144 assert_locked_or_safepoint(Compile_lock); | |
| 2145 symbolHandle name (THREAD, k->name()); | |
| 2146 | |
| 2147 { | |
| 2148 MutexLocker mu1(SystemDictionary_lock, THREAD); | |
| 2149 | |
| 2150 // See whether biased locking is enabled and if so set it for this | |
| 2151 // klass. | |
| 2152 // Note that this must be done past the last potential blocking | |
| 2153 // point / safepoint. We enable biased locking lazily using a | |
| 2154 // VM_Operation to iterate the SystemDictionary and installing the | |
| 2155 // biasable mark word into each instanceKlass's prototype header. | |
| 2156 // To avoid race conditions where we accidentally miss enabling the | |
| 2157 // optimization for one class in the process of being added to the | |
| 2158 // dictionary, we must not safepoint after the test of | |
| 2159 // BiasedLocking::enabled(). | |
| 2160 if (UseBiasedLocking && BiasedLocking::enabled()) { | |
| 2161 // Set biased locking bit for all loaded classes; it will be | |
| 2162 // cleared if revocation occurs too often for this type | |
| 2163 // NOTE that we must only do this when the class is initally | |
| 2164 // defined, not each time it is referenced from a new class loader | |
| 2165 if (k->class_loader() == class_loader()) { | |
| 2166 k->set_prototype_header(markOopDesc::biased_locking_prototype()); | |
| 2167 } | |
| 2168 } | |
| 2169 | |
| 2170 // Check for a placeholder. If there, remove it and make a | |
| 2171 // new system dictionary entry. | |
| 2172 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
| 2173 klassOop sd_check = find_class(d_index, d_hash, name, class_loader); | |
| 2174 if (sd_check == NULL) { | |
| 2175 dictionary()->add_klass(name, class_loader, k); | |
| 2176 notice_modification(); | |
| 2177 } | |
| 2178 #ifdef ASSERT | |
| 2179 sd_check = find_class(d_index, d_hash, name, class_loader); | |
| 2180 assert (sd_check != NULL, "should have entry in system dictionary"); | |
| 2181 // Changed to allow PH to remain to complete class circularity checking | |
| 2182 // while only one thread can define a class at one time, multiple | |
| 2183 // classes can resolve the superclass for a class at one time, | |
| 2184 // and the placeholder is used to track that | |
| 2185 // symbolOop ph_check = find_placeholder(p_index, p_hash, name, class_loader); | |
| 2186 // assert (ph_check == NULL, "should not have a placeholder entry"); | |
| 2187 #endif | |
| 2188 SystemDictionary_lock->notify_all(); | |
| 2189 } | |
| 2190 } | |
| 2191 | |
| 2192 | |
| 2193 klassOop SystemDictionary::find_constrained_instance_or_array_klass( | |
| 2194 symbolHandle class_name, Handle class_loader, TRAPS) { | |
| 2195 | |
| 2196 // First see if it has been loaded directly. | |
| 2197 // Force the protection domain to be null. (This removes protection checks.) | |
| 2198 Handle no_protection_domain; | |
| 2199 klassOop klass = find_instance_or_array_klass(class_name, class_loader, | |
| 2200 no_protection_domain, CHECK_NULL); | |
| 2201 if (klass != NULL) | |
| 2202 return klass; | |
| 2203 | |
| 2204 // Now look to see if it has been loaded elsewhere, and is subject to | |
| 2205 // a loader constraint that would require this loader to return the | |
| 2206 // klass that is already loaded. | |
| 2207 if (FieldType::is_array(class_name())) { | |
| 1336 | 2208 // For array classes, their klassOops are not kept in the |
| 2209 // constraint table. The element klassOops are. | |
| 0 | 2210 jint dimension; |
| 2211 symbolOop object_key; | |
| 2212 BasicType t = FieldType::get_array_info(class_name(), &dimension, | |
| 2213 &object_key, CHECK_(NULL)); | |
| 2214 if (t != T_OBJECT) { | |
| 2215 klass = Universe::typeArrayKlassObj(t); | |
| 2216 } else { | |
| 2217 symbolHandle elem_name(THREAD, object_key); | |
| 2218 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 1336 | 2219 klass = constraints()->find_constrained_klass(elem_name, class_loader); |
| 0 | 2220 } |
| 1336 | 2221 // If element class already loaded, allocate array klass |
| 0 | 2222 if (klass != NULL) { |
| 2223 klass = Klass::cast(klass)->array_klass_or_null(dimension); | |
| 2224 } | |
| 2225 } else { | |
| 2226 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 2227 // Non-array classes are easy: simply check the constraint table. | |
| 2228 klass = constraints()->find_constrained_klass(class_name, class_loader); | |
| 2229 } | |
| 2230 | |
| 2231 return klass; | |
| 2232 } | |
| 2233 | |
| 2234 | |
| 2235 bool SystemDictionary::add_loader_constraint(symbolHandle class_name, | |
| 2236 Handle class_loader1, | |
| 2237 Handle class_loader2, | |
| 2238 Thread* THREAD) { | |
| 1336 | 2239 symbolHandle constraint_name; |
| 2240 if (!FieldType::is_array(class_name())) { | |
| 2241 constraint_name = class_name; | |
| 2242 } else { | |
| 2243 // For array classes, their klassOops are not kept in the | |
| 2244 // constraint table. The element classes are. | |
| 2245 jint dimension; | |
| 2246 symbolOop object_key; | |
| 2247 BasicType t = FieldType::get_array_info(class_name(), &dimension, | |
| 2248 &object_key, CHECK_(false)); | |
| 2249 // primitive types always pass | |
| 2250 if (t != T_OBJECT) { | |
| 2251 return true; | |
| 2252 } else { | |
| 2253 constraint_name = symbolHandle(THREAD, object_key); | |
| 2254 } | |
| 2255 } | |
| 2256 unsigned int d_hash1 = dictionary()->compute_hash(constraint_name, class_loader1); | |
| 0 | 2257 int d_index1 = dictionary()->hash_to_index(d_hash1); |
| 2258 | |
| 1336 | 2259 unsigned int d_hash2 = dictionary()->compute_hash(constraint_name, class_loader2); |
| 0 | 2260 int d_index2 = dictionary()->hash_to_index(d_hash2); |
| 2261 { | |
| 1336 | 2262 MutexLocker mu_s(SystemDictionary_lock, THREAD); |
| 0 | 2263 |
| 1336 | 2264 // Better never do a GC while we're holding these oops |
| 2265 No_Safepoint_Verifier nosafepoint; | |
| 0 | 2266 |
| 1336 | 2267 klassOop klass1 = find_class(d_index1, d_hash1, constraint_name, class_loader1); |
| 2268 klassOop klass2 = find_class(d_index2, d_hash2, constraint_name, class_loader2); | |
| 2269 return constraints()->add_entry(constraint_name, klass1, class_loader1, | |
| 2270 klass2, class_loader2); | |
| 0 | 2271 } |
| 2272 } | |
| 2273 | |
| 2274 // Add entry to resolution error table to record the error when the first | |
| 2275 // attempt to resolve a reference to a class has failed. | |
| 2276 void SystemDictionary::add_resolution_error(constantPoolHandle pool, int which, symbolHandle error) { | |
| 2277 unsigned int hash = resolution_errors()->compute_hash(pool, which); | |
| 2278 int index = resolution_errors()->hash_to_index(hash); | |
| 2279 { | |
| 2280 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
| 2281 resolution_errors()->add_entry(index, hash, pool, which, error); | |
| 2282 } | |
| 2283 } | |
| 2284 | |
| 2285 // Lookup resolution error table. Returns error if found, otherwise NULL. | |
| 2286 symbolOop SystemDictionary::find_resolution_error(constantPoolHandle pool, int which) { | |
| 2287 unsigned int hash = resolution_errors()->compute_hash(pool, which); | |
| 2288 int index = resolution_errors()->hash_to_index(hash); | |
| 2289 { | |
| 2290 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
| 2291 ResolutionErrorEntry* entry = resolution_errors()->find_entry(index, hash, pool, which); | |
| 2292 return (entry != NULL) ? entry->error() : (symbolOop)NULL; | |
| 2293 } | |
| 2294 } | |
| 2295 | |
| 2296 | |
|
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2297 // Signature constraints ensure that callers and callees agree about |
|
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2298 // the meaning of type names in their signatures. This routine is the |
|
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2299 // intake for constraints. It collects them from several places: |
|
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2300 // |
|
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2301 // * LinkResolver::resolve_method (if check_access is true) requires |
|
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2302 // that the resolving class (the caller) and the defining class of |
|
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2303 // the resolved method (the callee) agree on each type in the |
|
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2304 // method's signature. |
|
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2305 // |
|
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2306 // * LinkResolver::resolve_interface_method performs exactly the same |
|
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2307 // checks. |
|
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2308 // |
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2309 // * LinkResolver::resolve_field requires that the constant pool |
|
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2310 // attempting to link to a field agree with the field's defining |
|
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2311 // class about the type of the field signature. |
|
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2312 // |
|
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2313 // * klassVtable::initialize_vtable requires that, when a class |
|
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2314 // overrides a vtable entry allocated by a superclass, that the |
|
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2315 // overriding method (i.e., the callee) agree with the superclass |
|
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2316 // on each type in the method's signature. |
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2317 // |
|
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2318 // * klassItable::initialize_itable requires that, when a class fills |
|
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2319 // in its itables, for each non-abstract method installed in an |
|
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2320 // itable, the method (i.e., the callee) agree with the interface |
|
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2321 // on each type in the method's signature. |
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2322 // |
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2323 // All those methods have a boolean (check_access, checkconstraints) |
|
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2324 // which turns off the checks. This is used from specialized contexts |
|
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2325 // such as bootstrapping, dumping, and debugging. |
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2326 // |
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2327 // No direct constraint is placed between the class and its |
|
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2328 // supertypes. Constraints are only placed along linked relations |
|
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2329 // between callers and callees. When a method overrides or implements |
|
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2330 // an abstract method in a supertype (superclass or interface), the |
|
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2331 // constraints are placed as if the supertype were the caller to the |
|
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2332 // overriding method. (This works well, since callers to the |
|
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2333 // supertype have already established agreement between themselves and |
|
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2334 // the supertype.) As a result of all this, a class can disagree with |
|
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2335 // its supertype about the meaning of a type name, as long as that |
|
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2336 // class neither calls a relevant method of the supertype, nor is |
|
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2337 // called (perhaps via an override) from the supertype. |
|
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2338 // |
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2339 // |
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2340 // SystemDictionary::check_signature_loaders(sig, l1, l2) |
|
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2341 // |
| 0 | 2342 // Make sure all class components (including arrays) in the given |
| 2343 // signature will be resolved to the same class in both loaders. | |
| 2344 // Returns the name of the type that failed a loader constraint check, or | |
| 2345 // NULL if no constraint failed. The returned C string needs cleaning up | |
|
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2346 // with a ResourceMark in the caller. No exception except OOME is thrown. |
| 1336 | 2347 // Arrays are not added to the loader constraint table, their elements are. |
| 0 | 2348 char* SystemDictionary::check_signature_loaders(symbolHandle signature, |
| 2349 Handle loader1, Handle loader2, | |
| 2350 bool is_method, TRAPS) { | |
| 2351 // Nothing to do if loaders are the same. | |
| 2352 if (loader1() == loader2()) { | |
| 2353 return NULL; | |
| 2354 } | |
| 2355 | |
| 2356 SignatureStream sig_strm(signature, is_method); | |
| 2357 while (!sig_strm.is_done()) { | |
| 2358 if (sig_strm.is_object()) { | |
| 2359 symbolOop s = sig_strm.as_symbol(CHECK_NULL); | |
| 2360 symbolHandle sig (THREAD, s); | |
| 2361 if (!add_loader_constraint(sig, loader1, loader2, THREAD)) { | |
| 2362 return sig()->as_C_string(); | |
| 2363 } | |
| 2364 } | |
| 2365 sig_strm.next(); | |
| 2366 } | |
| 2367 return NULL; | |
| 2368 } | |
| 2369 | |
| 2370 | |
|
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2371 methodOop SystemDictionary::find_method_handle_invoke(symbolHandle name, |
|
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|
2372 symbolHandle signature, |
|
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|
2373 KlassHandle accessing_klass, |
| 710 | 2374 TRAPS) { |
| 2375 if (!EnableMethodHandles) return NULL; | |
|
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2376 vmSymbols::SID name_id = vmSymbols::find_sid(name()); |
|
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2377 assert(name_id != vmSymbols::NO_SID, "must be a known name"); |
|
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2378 unsigned int hash = invoke_method_table()->compute_hash(signature, name_id); |
| 710 | 2379 int index = invoke_method_table()->hash_to_index(hash); |
|
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2380 SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, name_id); |
|
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|
2381 methodHandle non_cached_result; |
| 710 | 2382 if (spe == NULL || spe->property_oop() == NULL) { |
|
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2383 spe = NULL; |
| 710 | 2384 // Must create lots of stuff here, but outside of the SystemDictionary lock. |
|
1410
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|
2385 // (tw) May we do this? |
|
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|
2386 //if (THREAD->is_Compiler_thread()) |
|
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2387 // return NULL; // do not attempt from within compiler |
|
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|
2388 bool for_invokeGeneric = (name_id == vmSymbols::VM_SYMBOL_ENUM_NAME(invokeGeneric_name)); |
|
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|
2389 bool found_on_bcp = false; |
|
1793
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|
2390 Handle mt = find_method_handle_type(signature(), accessing_klass, |
|
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|
2391 for_invokeGeneric, |
|
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|
2392 found_on_bcp, CHECK_NULL); |
| 710 | 2393 KlassHandle mh_klass = SystemDictionaryHandles::MethodHandle_klass(); |
|
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|
2394 methodHandle m = methodOopDesc::make_invoke_method(mh_klass, name, signature, |
| 710 | 2395 mt, CHECK_NULL); |
| 2396 // Now grab the lock. We might have to throw away the new method, | |
| 2397 // if a racing thread has managed to install one at the same time. | |
|
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|
2398 if (found_on_bcp) { |
| 710 | 2399 MutexLocker ml(SystemDictionary_lock, Thread::current()); |
|
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|
2400 spe = invoke_method_table()->find_entry(index, hash, signature, name_id); |
| 710 | 2401 if (spe == NULL) |
|
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|
2402 spe = invoke_method_table()->add_entry(index, hash, signature, name_id); |
| 710 | 2403 if (spe->property_oop() == NULL) |
| 2404 spe->set_property_oop(m()); | |
|
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|
2405 } else { |
|
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|
2406 non_cached_result = m; |
| 710 | 2407 } |
| 2408 } | |
|
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|
2409 if (spe != NULL && spe->property_oop() != NULL) { |
|
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|
2410 assert(spe->property_oop()->is_method(), ""); |
|
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|
2411 return (methodOop) spe->property_oop(); |
|
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|
2412 } else { |
|
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|
2413 return non_cached_result(); |
|
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|
2414 } |
| 710 | 2415 } |
| 2416 | |
| 2417 // Ask Java code to find or construct a java.dyn.MethodType for the given | |
| 2418 // signature, as interpreted relative to the given class loader. | |
| 2419 // Because of class loader constraints, all method handle usage must be | |
| 2420 // consistent with this loader. | |
|
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|
2421 Handle SystemDictionary::find_method_handle_type(symbolHandle signature, |
|
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|
2422 KlassHandle accessing_klass, |
|
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2423 bool for_invokeGeneric, |
|
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|
2424 bool& return_bcp_flag, |
|
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|
2425 TRAPS) { |
|
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|
2426 Handle class_loader, protection_domain; |
|
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|
2427 bool is_on_bcp = true; // keep this true as long as we can materialize from the boot classloader |
| 710 | 2428 Handle empty; |
| 2429 int npts = ArgumentCount(signature()).size(); | |
| 1142 | 2430 objArrayHandle pts = oopFactory::new_objArray(SystemDictionary::Class_klass(), npts, CHECK_(empty)); |
| 710 | 2431 int arg = 0; |
| 2432 Handle rt; // the return type from the signature | |
| 2433 for (SignatureStream ss(signature()); !ss.is_done(); ss.next()) { | |
|
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|
2434 oop mirror = NULL; |
|
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|
2435 if (is_on_bcp) { |
|
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|
2436 mirror = ss.as_java_mirror(class_loader, protection_domain, |
|
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|
2437 SignatureStream::ReturnNull, CHECK_(empty)); |
|
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|
2438 if (mirror == NULL) { |
|
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|
2439 // fall back from BCP to accessing_klass |
|
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|
2440 if (accessing_klass.not_null()) { |
|
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|
2441 class_loader = Handle(THREAD, instanceKlass::cast(accessing_klass())->class_loader()); |
|
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|
2442 protection_domain = Handle(THREAD, instanceKlass::cast(accessing_klass())->protection_domain()); |
|
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|
2443 } |
|
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|
2444 is_on_bcp = false; |
|
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|
2445 } |
|
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|
2446 } |
|
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|
2447 if (!is_on_bcp) { |
|
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|
2448 // Resolve, throwing a real error if it doesn't work. |
|
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|
2449 mirror = ss.as_java_mirror(class_loader, protection_domain, |
|
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|
2450 SignatureStream::NCDFError, CHECK_(empty)); |
| 710 | 2451 } |
| 2452 if (ss.at_return_type()) | |
| 2453 rt = Handle(THREAD, mirror); | |
| 2454 else | |
| 2455 pts->obj_at_put(arg++, mirror); | |
|
1508
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6939196: method handle signatures off the boot class path get linkage errors
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1507
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|
2456 // Check accessibility. |
|
2ffde6cfe049
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|
2457 if (ss.is_object() && accessing_klass.not_null()) { |
|
2ffde6cfe049
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|
2458 klassOop sel_klass = java_lang_Class::as_klassOop(mirror); |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
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|
2459 // Emulate constantPoolOopDesc::verify_constant_pool_resolve. |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
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1507
diff
changeset
|
2460 if (Klass::cast(sel_klass)->oop_is_objArray()) |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
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diff
changeset
|
2461 sel_klass = objArrayKlass::cast(sel_klass)->bottom_klass(); |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
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1507
diff
changeset
|
2462 if (Klass::cast(sel_klass)->oop_is_instance()) { |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
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|
2463 KlassHandle sel_kh(THREAD, sel_klass); |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
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|
2464 LinkResolver::check_klass_accessability(accessing_klass, sel_kh, CHECK_(empty)); |
|
2ffde6cfe049
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|
2465 } |
|
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|
2466 } |
| 710 | 2467 } |
| 2468 assert(arg == npts, ""); | |
| 2469 | |
|
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6939134: JSR 292 adjustments to method handle invocation
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changeset
|
2470 // call sun.dyn.MethodHandleNatives::findMethodType(Class rt, Class[] pts) -> MethodType |
| 710 | 2471 JavaCallArguments args(Handle(THREAD, rt())); |
| 2472 args.push_oop(pts()); | |
| 2473 JavaValue result(T_OBJECT); | |
| 2474 JavaCalls::call_static(&result, | |
|
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
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1339
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|
2475 SystemDictionary::MethodHandleNatives_klass(), |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
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1339
diff
changeset
|
2476 vmSymbols::findMethodHandleType_name(), |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
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1339
diff
changeset
|
2477 vmSymbols::findMethodHandleType_signature(), |
| 710 | 2478 &args, CHECK_(empty)); |
|
1793
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
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1660
diff
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|
2479 Handle method_type(THREAD, (oop) result.get_jobject()); |
|
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
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diff
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|
2480 |
|
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
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1660
diff
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|
2481 if (for_invokeGeneric) { |
|
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
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1660
diff
changeset
|
2482 // call sun.dyn.MethodHandleNatives::notifyGenericMethodType(MethodType) -> void |
|
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
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|
2483 JavaCallArguments args(Handle(THREAD, method_type())); |
|
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
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1660
diff
changeset
|
2484 JavaValue no_result(T_VOID); |
|
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
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diff
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|
2485 JavaCalls::call_static(&no_result, |
|
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
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1660
diff
changeset
|
2486 SystemDictionary::MethodHandleNatives_klass(), |
|
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
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diff
changeset
|
2487 vmSymbols::notifyGenericMethodType_name(), |
|
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
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1660
diff
changeset
|
2488 vmSymbols::notifyGenericMethodType_signature(), |
|
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
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1660
diff
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|
2489 &args, THREAD); |
|
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
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1660
diff
changeset
|
2490 if (HAS_PENDING_EXCEPTION) { |
|
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
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1660
diff
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|
2491 // If the notification fails, just kill it. |
|
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
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diff
changeset
|
2492 CLEAR_PENDING_EXCEPTION; |
|
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
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1660
diff
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|
2493 } |
|
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
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1660
diff
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|
2494 } |
|
1508
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
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diff
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|
2495 |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
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diff
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|
2496 // report back to the caller with the MethodType and the "on_bcp" flag |
|
2ffde6cfe049
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diff
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|
2497 return_bcp_flag = is_on_bcp; |
|
1793
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|
2498 return method_type; |
| 710 | 2499 } |
| 2500 | |
| 1602 | 2501 // Ask Java code to find or construct a method handle constant. |
| 2502 Handle SystemDictionary::link_method_handle_constant(KlassHandle caller, | |
| 2503 int ref_kind, //e.g., JVM_REF_invokeVirtual | |
| 2504 KlassHandle callee, | |
| 2505 symbolHandle name_sym, | |
| 2506 symbolHandle signature, | |
| 2507 TRAPS) { | |
| 2508 Handle empty; | |
| 2509 Handle name = java_lang_String::create_from_symbol(name_sym(), CHECK_(empty)); | |
| 2510 Handle type; | |
| 2511 if (signature->utf8_length() > 0 && signature->byte_at(0) == '(') { | |
| 2512 bool ignore_is_on_bcp = false; | |
|
1793
d257356e35f0
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diff
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|
2513 type = find_method_handle_type(signature, caller, false, ignore_is_on_bcp, CHECK_(empty)); |
| 1602 | 2514 } else { |
| 2515 SignatureStream ss(signature(), false); | |
| 2516 if (!ss.is_done()) { | |
| 2517 oop mirror = ss.as_java_mirror(caller->class_loader(), caller->protection_domain(), | |
| 2518 SignatureStream::NCDFError, CHECK_(empty)); | |
| 2519 type = Handle(THREAD, mirror); | |
| 2520 ss.next(); | |
| 2521 if (!ss.is_done()) type = Handle(); // error! | |
| 2522 } | |
| 2523 } | |
| 2524 if (type.is_null()) { | |
| 2525 THROW_MSG_(vmSymbols::java_lang_LinkageError(), "bad signature", empty); | |
| 2526 } | |
| 2527 | |
| 2528 // call sun.dyn.MethodHandleNatives::linkMethodHandleConstant(Class caller, int refKind, Class callee, String name, Object type) -> MethodHandle | |
| 2529 JavaCallArguments args; | |
| 2530 args.push_oop(caller->java_mirror()); // the referring class | |
| 2531 args.push_int(ref_kind); | |
| 2532 args.push_oop(callee->java_mirror()); // the target class | |
| 2533 args.push_oop(name()); | |
| 2534 args.push_oop(type()); | |
| 2535 JavaValue result(T_OBJECT); | |
| 2536 JavaCalls::call_static(&result, | |
| 2537 SystemDictionary::MethodHandleNatives_klass(), | |
| 2538 vmSymbols::linkMethodHandleConstant_name(), | |
| 2539 vmSymbols::linkMethodHandleConstant_signature(), | |
| 2540 &args, CHECK_(empty)); | |
| 2541 return Handle(THREAD, (oop) result.get_jobject()); | |
| 2542 } | |
| 710 | 2543 |
|
726
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6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2544 // Ask Java code to find or construct a java.dyn.CallSite for the given |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
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710
diff
changeset
|
2545 // name and signature, as interpreted relative to the given class loader. |
|
1507
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jrose
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1339
diff
changeset
|
2546 Handle SystemDictionary::make_dynamic_call_site(Handle bootstrap_method, |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2547 symbolHandle name, |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2548 methodHandle signature_invoker, |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2549 Handle info, |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2550 methodHandle caller_method, |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2551 int caller_bci, |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2552 TRAPS) { |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2553 Handle empty; |
|
1660
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2554 guarantee(bootstrap_method.not_null() && |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2555 java_dyn_MethodHandle::is_instance(bootstrap_method()), |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2556 "caller must supply a valid BSM"); |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2557 |
|
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2558 Handle caller_mname = MethodHandles::new_MemberName(CHECK_(empty)); |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2559 MethodHandles::init_MemberName(caller_mname(), caller_method()); |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2560 |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2561 // call sun.dyn.MethodHandleNatives::makeDynamicCallSite(bootm, name, mtype, info, caller_mname, caller_pos) |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2562 oop name_str_oop = StringTable::intern(name(), CHECK_(empty)); // not a handle! |
|
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2563 JavaCallArguments args(Handle(THREAD, bootstrap_method())); |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2564 args.push_oop(name_str_oop); |
|
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2565 args.push_oop(signature_invoker->method_handle_type()); |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2566 args.push_oop(info()); |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2567 args.push_oop(caller_mname()); |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2568 args.push_int(caller_bci); |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2569 JavaValue result(T_OBJECT); |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2570 JavaCalls::call_static(&result, |
|
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2571 SystemDictionary::MethodHandleNatives_klass(), |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2572 vmSymbols::makeDynamicCallSite_name(), |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2573 vmSymbols::makeDynamicCallSite_signature(), |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2574 &args, CHECK_(empty)); |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2575 oop call_site_oop = (oop) result.get_jobject(); |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
875
diff
changeset
|
2576 assert(call_site_oop->is_oop() |
|
1059
389049f3f393
6858164: invokedynamic code needs some cleanup (post-6655638)
jrose
parents:
1039
diff
changeset
|
2577 /*&& java_dyn_CallSite::is_instance(call_site_oop)*/, "must be sane"); |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2578 if (TraceMethodHandles) { |
|
1059
389049f3f393
6858164: invokedynamic code needs some cleanup (post-6655638)
jrose
parents:
1039
diff
changeset
|
2579 #ifndef PRODUCT |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2580 tty->print_cr("Linked invokedynamic bci=%d site="INTPTR_FORMAT":", caller_bci, call_site_oop); |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2581 call_site_oop->print(); |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2582 tty->cr(); |
|
1059
389049f3f393
6858164: invokedynamic code needs some cleanup (post-6655638)
jrose
parents:
1039
diff
changeset
|
2583 #endif //PRODUCT |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2584 } |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2585 return call_site_oop; |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2586 } |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2587 |
|
1660
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
changeset
|
2588 Handle SystemDictionary::find_bootstrap_method(methodHandle caller_method, int caller_bci, |
|
1913
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2589 int cache_index, |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2590 Handle& argument_info_result, |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2591 TRAPS) { |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2592 Handle empty; |
|
1660
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
changeset
|
2593 |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2594 constantPoolHandle pool; |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2595 { |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2596 klassOop caller = caller_method->method_holder(); |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2597 if (!Klass::cast(caller)->oop_is_instance()) return empty; |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2598 pool = constantPoolHandle(THREAD, instanceKlass::cast(caller)->constants()); |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2599 } |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2600 |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2601 int constant_pool_index = pool->cache()->entry_at(cache_index)->constant_pool_index(); |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
changeset
|
2602 constantTag tag = pool->tag_at(constant_pool_index); |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
changeset
|
2603 |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
changeset
|
2604 if (tag.is_invoke_dynamic()) { |
|
1913
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
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1903
diff
changeset
|
2605 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments |
|
1660
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2606 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry. |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2607 int bsm_index = pool->invoke_dynamic_bootstrap_method_ref_index_at(constant_pool_index); |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
changeset
|
2608 if (bsm_index != 0) { |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
changeset
|
2609 int bsm_index_in_cache = pool->cache()->entry_at(cache_index)->bootstrap_method_index_in_cache(); |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
changeset
|
2610 DEBUG_ONLY(int bsm_index_2 = pool->cache()->entry_at(bsm_index_in_cache)->constant_pool_index()); |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
changeset
|
2611 assert(bsm_index == bsm_index_2, "BSM constant lifted to cache"); |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
changeset
|
2612 if (TraceMethodHandles) { |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
changeset
|
2613 tty->print_cr("resolving bootstrap method for "PTR_FORMAT" at %d at cache[%d]CP[%d]...", |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
changeset
|
2614 (intptr_t) caller_method(), caller_bci, cache_index, constant_pool_index); |
|
083fde3b838e
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|
2615 } |
|
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|
2616 oop bsm_oop = pool->resolve_cached_constant_at(bsm_index_in_cache, CHECK_(empty)); |
|
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|
2617 if (TraceMethodHandles) { |
|
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6964498: JSR 292 invokedynamic sites need local bootstrap methods
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|
2618 tty->print_cr("bootstrap method for "PTR_FORMAT" at %d retrieved as "PTR_FORMAT":", |
|
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|
2619 (intptr_t) caller_method(), caller_bci, (intptr_t) bsm_oop); |
|
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|
2620 } |
|
1913
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|
2621 assert(bsm_oop->is_oop(), "must be sane"); |
|
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|
2622 // caller must verify that it is of type MethodHandle |
|
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|
2623 Handle bsm(THREAD, bsm_oop); |
|
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|
2624 bsm_oop = NULL; // safety |
|
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jrose
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|
2625 |
|
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|
2626 // Extract the optional static arguments. |
|
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|
2627 Handle argument_info; // either null, or one arg, or Object[]{arg...} |
|
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6984311: JSR 292 needs optional bootstrap method parameters
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|
2628 int argc = pool->invoke_dynamic_argument_count_at(constant_pool_index); |
|
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|
2629 if (TraceInvokeDynamic) { |
|
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|
2630 tty->print_cr("find_bootstrap_method: [%d/%d] CONSTANT_InvokeDynamic: %d[%d]", |
|
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6984311: JSR 292 needs optional bootstrap method parameters
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|
2631 constant_pool_index, cache_index, bsm_index, argc); |
|
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|
2632 } |
|
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jrose
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diff
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|
2633 if (argc > 0) { |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
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|
2634 objArrayHandle arg_array; |
|
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6984311: JSR 292 needs optional bootstrap method parameters
jrose
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|
2635 if (argc > 1) { |
|
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6984311: JSR 292 needs optional bootstrap method parameters
jrose
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|
2636 objArrayOop arg_array_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), argc, CHECK_(empty)); |
|
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6984311: JSR 292 needs optional bootstrap method parameters
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|
2637 arg_array = objArrayHandle(THREAD, arg_array_oop); |
|
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jrose
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|
2638 argument_info = arg_array; |
|
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jrose
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diff
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|
2639 } |
|
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|
2640 for (int arg_i = 0; arg_i < argc; arg_i++) { |
|
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|
2641 int arg_index = pool->invoke_dynamic_argument_index_at(constant_pool_index, arg_i); |
|
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|
2642 oop arg_oop = pool->resolve_possibly_cached_constant_at(arg_index, CHECK_(empty)); |
|
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|
2643 if (arg_array.is_null()) { |
|
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|
2644 argument_info = Handle(THREAD, arg_oop); |
|
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|
2645 } else { |
|
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|
2646 arg_array->obj_at_put(arg_i, arg_oop); |
|
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|
2647 } |
|
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|
2648 } |
|
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|
2649 } |
|
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|
2650 |
|
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|
2651 argument_info_result = argument_info; // return argument_info to caller |
|
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|
2652 return bsm; |
|
1660
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6964498: JSR 292 invokedynamic sites need local bootstrap methods
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|
2653 } |
|
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|
2654 // else null BSM; fall through |
|
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|
2655 } else if (tag.is_name_and_type()) { |
|
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|
2656 // JSR 292 EDR does not have JVM_CONSTANT_InvokeDynamic |
|
083fde3b838e
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|
2657 // a bare name&type defaults its BSM to null, so fall through... |
|
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|
2658 } else { |
|
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|
2659 ShouldNotReachHere(); // verifier does not allow this |
|
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|
2660 } |
|
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|
2661 |
|
083fde3b838e
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|
2662 // Fall through to pick up the per-class bootstrap method. |
|
083fde3b838e
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|
2663 // This mechanism may go away in the PFD. |
|
083fde3b838e
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|
2664 assert(AllowTransitionalJSR292, "else the verifier should have stopped us already"); |
|
1913
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|
2665 argument_info_result = empty; // return no argument_info to caller |
|
1660
083fde3b838e
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|
2666 oop bsm_oop = instanceKlass::cast(caller_method->method_holder())->bootstrap_method(); |
|
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|
2667 if (bsm_oop != NULL) { |
|
1059
389049f3f393
6858164: invokedynamic code needs some cleanup (post-6655638)
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1039
diff
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|
2668 if (TraceMethodHandles) { |
|
1660
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
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diff
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|
2669 tty->print_cr("bootstrap method for "PTR_FORMAT" registered as "PTR_FORMAT":", |
|
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6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
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|
2670 (intptr_t) caller_method(), (intptr_t) bsm_oop); |
|
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389049f3f393
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1039
diff
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|
2671 } |
|
1913
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|
2672 assert(bsm_oop->is_oop(), "must be sane"); |
|
1660
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
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|
2673 return Handle(THREAD, bsm_oop); |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2674 } |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2675 |
|
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2676 return empty; |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2677 } |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
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710
diff
changeset
|
2678 |
| 0 | 2679 // Since the identity hash code for symbols changes when the symbols are |
| 2680 // moved from the regular perm gen (hash in the mark word) to the shared | |
| 2681 // spaces (hash is the address), the classes loaded into the dictionary | |
| 2682 // may be in the wrong buckets. | |
| 2683 | |
| 2684 void SystemDictionary::reorder_dictionary() { | |
| 2685 dictionary()->reorder_dictionary(); | |
| 2686 } | |
| 2687 | |
| 2688 | |
| 2689 void SystemDictionary::copy_buckets(char** top, char* end) { | |
| 2690 dictionary()->copy_buckets(top, end); | |
| 2691 } | |
| 2692 | |
| 2693 | |
| 2694 void SystemDictionary::copy_table(char** top, char* end) { | |
| 2695 dictionary()->copy_table(top, end); | |
| 2696 } | |
| 2697 | |
| 2698 | |
| 2699 void SystemDictionary::reverse() { | |
| 2700 dictionary()->reverse(); | |
| 2701 } | |
| 2702 | |
| 2703 int SystemDictionary::number_of_classes() { | |
| 2704 return dictionary()->number_of_entries(); | |
| 2705 } | |
| 2706 | |
| 2707 | |
| 2708 // ---------------------------------------------------------------------------- | |
| 2709 #ifndef PRODUCT | |
| 2710 | |
| 2711 void SystemDictionary::print() { | |
| 2712 dictionary()->print(); | |
| 2713 | |
| 2714 // Placeholders | |
| 2715 GCMutexLocker mu(SystemDictionary_lock); | |
| 2716 placeholders()->print(); | |
| 2717 | |
| 2718 // loader constraints - print under SD_lock | |
| 2719 constraints()->print(); | |
| 2720 } | |
| 2721 | |
| 2722 #endif | |
| 2723 | |
| 2724 void SystemDictionary::verify() { | |
| 2725 guarantee(dictionary() != NULL, "Verify of system dictionary failed"); | |
| 2726 guarantee(constraints() != NULL, | |
| 2727 "Verify of loader constraints failed"); | |
| 2728 guarantee(dictionary()->number_of_entries() >= 0 && | |
| 2729 placeholders()->number_of_entries() >= 0, | |
| 2730 "Verify of system dictionary failed"); | |
| 2731 | |
| 2732 // Verify dictionary | |
| 2733 dictionary()->verify(); | |
| 2734 | |
| 2735 GCMutexLocker mu(SystemDictionary_lock); | |
| 2736 placeholders()->verify(); | |
| 2737 | |
| 2738 // Verify constraint table | |
| 2739 guarantee(constraints() != NULL, "Verify of loader constraints failed"); | |
|
1258
38836cf1d8d2
6920977: G1: guarantee(k == probe->klass(),"klass should be in dictionary") fails
tonyp
parents:
1142
diff
changeset
|
2740 constraints()->verify(dictionary(), placeholders()); |
| 0 | 2741 } |
| 2742 | |
| 2743 | |
| 2744 void SystemDictionary::verify_obj_klass_present(Handle obj, | |
| 2745 symbolHandle class_name, | |
| 2746 Handle class_loader) { | |
| 2747 GCMutexLocker mu(SystemDictionary_lock); | |
| 2748 oop probe = find_class_or_placeholder(class_name, class_loader); | |
| 2749 if (probe == NULL) { | |
| 2750 probe = SystemDictionary::find_shared_class(class_name); | |
| 2751 } | |
| 2752 guarantee(probe != NULL && | |
| 2753 (!probe->is_klass() || probe == obj()), | |
| 2754 "Loaded klasses should be in SystemDictionary"); | |
| 2755 } | |
| 2756 | |
| 2757 #ifndef PRODUCT | |
| 2758 | |
| 2759 // statistics code | |
| 2760 class ClassStatistics: AllStatic { | |
| 2761 private: | |
| 2762 static int nclasses; // number of classes | |
| 2763 static int nmethods; // number of methods | |
| 2764 static int nmethoddata; // number of methodData | |
| 2765 static int class_size; // size of class objects in words | |
| 2766 static int method_size; // size of method objects in words | |
| 2767 static int debug_size; // size of debug info in methods | |
| 2768 static int methoddata_size; // size of methodData objects in words | |
| 2769 | |
| 2770 static void do_class(klassOop k) { | |
| 2771 nclasses++; | |
| 2772 class_size += k->size(); | |
| 2773 if (k->klass_part()->oop_is_instance()) { | |
| 2774 instanceKlass* ik = (instanceKlass*)k->klass_part(); | |
| 2775 class_size += ik->methods()->size(); | |
| 2776 class_size += ik->constants()->size(); | |
| 2777 class_size += ik->local_interfaces()->size(); | |
| 2778 class_size += ik->transitive_interfaces()->size(); | |
| 2779 // We do not have to count implementors, since we only store one! | |
| 2780 class_size += ik->fields()->size(); | |
| 2781 } | |
| 2782 } | |
| 2783 | |
| 2784 static void do_method(methodOop m) { | |
| 2785 nmethods++; | |
| 2786 method_size += m->size(); | |
| 2787 // class loader uses same objArray for empty vectors, so don't count these | |
| 2788 if (m->exception_table()->length() != 0) method_size += m->exception_table()->size(); | |
| 2789 if (m->has_stackmap_table()) { | |
| 2790 method_size += m->stackmap_data()->size(); | |
| 2791 } | |
| 2792 | |
| 2793 methodDataOop mdo = m->method_data(); | |
| 2794 if (mdo != NULL) { | |
| 2795 nmethoddata++; | |
| 2796 methoddata_size += mdo->size(); | |
| 2797 } | |
| 2798 } | |
| 2799 | |
| 2800 public: | |
| 2801 static void print() { | |
| 2802 SystemDictionary::classes_do(do_class); | |
| 2803 SystemDictionary::methods_do(do_method); | |
| 2804 tty->print_cr("Class statistics:"); | |
| 2805 tty->print_cr("%d classes (%d bytes)", nclasses, class_size * oopSize); | |
| 2806 tty->print_cr("%d methods (%d bytes = %d base + %d debug info)", nmethods, | |
| 2807 (method_size + debug_size) * oopSize, method_size * oopSize, debug_size * oopSize); | |
| 2808 tty->print_cr("%d methoddata (%d bytes)", nmethoddata, methoddata_size * oopSize); | |
| 2809 } | |
| 2810 }; | |
| 2811 | |
| 2812 | |
| 2813 int ClassStatistics::nclasses = 0; | |
| 2814 int ClassStatistics::nmethods = 0; | |
| 2815 int ClassStatistics::nmethoddata = 0; | |
| 2816 int ClassStatistics::class_size = 0; | |
| 2817 int ClassStatistics::method_size = 0; | |
| 2818 int ClassStatistics::debug_size = 0; | |
| 2819 int ClassStatistics::methoddata_size = 0; | |
| 2820 | |
| 2821 void SystemDictionary::print_class_statistics() { | |
| 2822 ResourceMark rm; | |
| 2823 ClassStatistics::print(); | |
| 2824 } | |
| 2825 | |
| 2826 | |
| 2827 class MethodStatistics: AllStatic { | |
| 2828 public: | |
| 2829 enum { | |
| 2830 max_parameter_size = 10 | |
| 2831 }; | |
| 2832 private: | |
| 2833 | |
| 2834 static int _number_of_methods; | |
| 2835 static int _number_of_final_methods; | |
| 2836 static int _number_of_static_methods; | |
| 2837 static int _number_of_native_methods; | |
| 2838 static int _number_of_synchronized_methods; | |
| 2839 static int _number_of_profiled_methods; | |
| 2840 static int _number_of_bytecodes; | |
| 2841 static int _parameter_size_profile[max_parameter_size]; | |
| 2842 static int _bytecodes_profile[Bytecodes::number_of_java_codes]; | |
| 2843 | |
| 2844 static void initialize() { | |
| 2845 _number_of_methods = 0; | |
| 2846 _number_of_final_methods = 0; | |
| 2847 _number_of_static_methods = 0; | |
| 2848 _number_of_native_methods = 0; | |
| 2849 _number_of_synchronized_methods = 0; | |
| 2850 _number_of_profiled_methods = 0; | |
| 2851 _number_of_bytecodes = 0; | |
| 2852 for (int i = 0; i < max_parameter_size ; i++) _parameter_size_profile[i] = 0; | |
| 2853 for (int j = 0; j < Bytecodes::number_of_java_codes; j++) _bytecodes_profile [j] = 0; | |
| 2854 }; | |
| 2855 | |
| 2856 static void do_method(methodOop m) { | |
| 2857 _number_of_methods++; | |
| 2858 // collect flag info | |
| 2859 if (m->is_final() ) _number_of_final_methods++; | |
| 2860 if (m->is_static() ) _number_of_static_methods++; | |
| 2861 if (m->is_native() ) _number_of_native_methods++; | |
| 2862 if (m->is_synchronized()) _number_of_synchronized_methods++; | |
| 2863 if (m->method_data() != NULL) _number_of_profiled_methods++; | |
| 2864 // collect parameter size info (add one for receiver, if any) | |
| 2865 _parameter_size_profile[MIN2(m->size_of_parameters() + (m->is_static() ? 0 : 1), max_parameter_size - 1)]++; | |
| 2866 // collect bytecodes info | |
| 2867 { | |
| 2868 Thread *thread = Thread::current(); | |
| 2869 HandleMark hm(thread); | |
| 2870 BytecodeStream s(methodHandle(thread, m)); | |
| 2871 Bytecodes::Code c; | |
| 2872 while ((c = s.next()) >= 0) { | |
| 2873 _number_of_bytecodes++; | |
| 2874 _bytecodes_profile[c]++; | |
| 2875 } | |
| 2876 } | |
| 2877 } | |
| 2878 | |
| 2879 public: | |
| 2880 static void print() { | |
| 2881 initialize(); | |
| 2882 SystemDictionary::methods_do(do_method); | |
| 2883 // generate output | |
| 2884 tty->cr(); | |
| 2885 tty->print_cr("Method statistics (static):"); | |
| 2886 // flag distribution | |
| 2887 tty->cr(); | |
| 2888 tty->print_cr("%6d final methods %6.1f%%", _number_of_final_methods , _number_of_final_methods * 100.0F / _number_of_methods); | |
| 2889 tty->print_cr("%6d static methods %6.1f%%", _number_of_static_methods , _number_of_static_methods * 100.0F / _number_of_methods); | |
| 2890 tty->print_cr("%6d native methods %6.1f%%", _number_of_native_methods , _number_of_native_methods * 100.0F / _number_of_methods); | |
| 2891 tty->print_cr("%6d synchronized methods %6.1f%%", _number_of_synchronized_methods, _number_of_synchronized_methods * 100.0F / _number_of_methods); | |
| 2892 tty->print_cr("%6d profiled methods %6.1f%%", _number_of_profiled_methods, _number_of_profiled_methods * 100.0F / _number_of_methods); | |
| 2893 // parameter size profile | |
| 2894 tty->cr(); | |
| 2895 { int tot = 0; | |
| 2896 int avg = 0; | |
| 2897 for (int i = 0; i < max_parameter_size; i++) { | |
| 2898 int n = _parameter_size_profile[i]; | |
| 2899 tot += n; | |
| 2900 avg += n*i; | |
| 2901 tty->print_cr("parameter size = %1d: %6d methods %5.1f%%", i, n, n * 100.0F / _number_of_methods); | |
| 2902 } | |
| 2903 assert(tot == _number_of_methods, "should be the same"); | |
| 2904 tty->print_cr(" %6d methods 100.0%%", _number_of_methods); | |
| 2905 tty->print_cr("(average parameter size = %3.1f including receiver, if any)", (float)avg / _number_of_methods); | |
| 2906 } | |
| 2907 // bytecodes profile | |
| 2908 tty->cr(); | |
| 2909 { int tot = 0; | |
| 2910 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) { | |
| 2911 if (Bytecodes::is_defined(i)) { | |
| 2912 Bytecodes::Code c = Bytecodes::cast(i); | |
| 2913 int n = _bytecodes_profile[c]; | |
| 2914 tot += n; | |
| 2915 tty->print_cr("%9d %7.3f%% %s", n, n * 100.0F / _number_of_bytecodes, Bytecodes::name(c)); | |
| 2916 } | |
| 2917 } | |
| 2918 assert(tot == _number_of_bytecodes, "should be the same"); | |
| 2919 tty->print_cr("%9d 100.000%%", _number_of_bytecodes); | |
| 2920 } | |
| 2921 tty->cr(); | |
| 2922 } | |
| 2923 }; | |
| 2924 | |
| 2925 int MethodStatistics::_number_of_methods; | |
| 2926 int MethodStatistics::_number_of_final_methods; | |
| 2927 int MethodStatistics::_number_of_static_methods; | |
| 2928 int MethodStatistics::_number_of_native_methods; | |
| 2929 int MethodStatistics::_number_of_synchronized_methods; | |
| 2930 int MethodStatistics::_number_of_profiled_methods; | |
| 2931 int MethodStatistics::_number_of_bytecodes; | |
| 2932 int MethodStatistics::_parameter_size_profile[MethodStatistics::max_parameter_size]; | |
| 2933 int MethodStatistics::_bytecodes_profile[Bytecodes::number_of_java_codes]; | |
| 2934 | |
| 2935 | |
| 2936 void SystemDictionary::print_method_statistics() { | |
| 2937 MethodStatistics::print(); | |
| 2938 } | |
| 2939 | |
| 2940 #endif // PRODUCT |