Wed, 17 Jul 2013 18:06:29 -0400
8020309: Eliminate InstanceKlass::_cached_class_file_len.
Summary: Use JvmtiCachedClassFileData.
Reviewed-by: iklam, sspitsyn, dcubed
duke@435 | 1 | /* |
acorn@4425 | 2 | * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
trims@1907 | 21 | * questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
stefank@2314 | 25 | #include "precompiled.hpp" |
coleenp@4037 | 26 | #include "classfile/classLoaderData.inline.hpp" |
stefank@2314 | 27 | #include "classfile/dictionary.hpp" |
stefank@2314 | 28 | #include "classfile/javaClasses.hpp" |
stefank@2314 | 29 | #include "classfile/loaderConstraints.hpp" |
stefank@2314 | 30 | #include "classfile/placeholders.hpp" |
stefank@2314 | 31 | #include "classfile/resolutionErrors.hpp" |
stefank@2314 | 32 | #include "classfile/systemDictionary.hpp" |
stefank@2314 | 33 | #include "classfile/vmSymbols.hpp" |
twisti@3969 | 34 | #include "compiler/compileBroker.hpp" |
stefank@2314 | 35 | #include "interpreter/bytecodeStream.hpp" |
stefank@2314 | 36 | #include "interpreter/interpreter.hpp" |
stefank@2314 | 37 | #include "memory/gcLocker.hpp" |
stefank@2314 | 38 | #include "memory/oopFactory.hpp" |
stefank@2314 | 39 | #include "oops/instanceKlass.hpp" |
stefank@2314 | 40 | #include "oops/instanceRefKlass.hpp" |
stefank@2314 | 41 | #include "oops/klass.inline.hpp" |
coleenp@4037 | 42 | #include "oops/methodData.hpp" |
stefank@2314 | 43 | #include "oops/objArrayKlass.hpp" |
stefank@2314 | 44 | #include "oops/oop.inline.hpp" |
stefank@2314 | 45 | #include "oops/oop.inline2.hpp" |
stefank@2314 | 46 | #include "oops/typeArrayKlass.hpp" |
stefank@2314 | 47 | #include "prims/jvmtiEnvBase.hpp" |
stefank@2314 | 48 | #include "prims/methodHandles.hpp" |
stefank@2314 | 49 | #include "runtime/biasedLocking.hpp" |
stefank@2314 | 50 | #include "runtime/fieldType.hpp" |
stefank@2314 | 51 | #include "runtime/handles.inline.hpp" |
stefank@2314 | 52 | #include "runtime/java.hpp" |
stefank@2314 | 53 | #include "runtime/javaCalls.hpp" |
stefank@2314 | 54 | #include "runtime/mutexLocker.hpp" |
stefank@2314 | 55 | #include "runtime/signature.hpp" |
stefank@2314 | 56 | #include "services/classLoadingService.hpp" |
stefank@2314 | 57 | #include "services/threadService.hpp" |
duke@435 | 58 | |
sla@5237 | 59 | #if INCLUDE_TRACE |
sla@5237 | 60 | #include "trace/tracing.hpp" |
sla@5237 | 61 | #include "trace/traceMacros.hpp" |
sla@5237 | 62 | #endif |
sla@5237 | 63 | |
duke@435 | 64 | |
twisti@2258 | 65 | Dictionary* SystemDictionary::_dictionary = NULL; |
twisti@2258 | 66 | PlaceholderTable* SystemDictionary::_placeholders = NULL; |
twisti@2258 | 67 | Dictionary* SystemDictionary::_shared_dictionary = NULL; |
twisti@2258 | 68 | LoaderConstraintTable* SystemDictionary::_loader_constraints = NULL; |
twisti@2258 | 69 | ResolutionErrorTable* SystemDictionary::_resolution_errors = NULL; |
twisti@2258 | 70 | SymbolPropertyTable* SystemDictionary::_invoke_method_table = NULL; |
duke@435 | 71 | |
duke@435 | 72 | |
duke@435 | 73 | int SystemDictionary::_number_of_modifications = 0; |
acorn@3491 | 74 | int SystemDictionary::_sdgeneration = 0; |
acorn@3491 | 75 | const int SystemDictionary::_primelist[_prime_array_size] = {1009,2017,4049,5051,10103, |
acorn@3491 | 76 | 20201,40423,99991}; |
duke@435 | 77 | |
duke@435 | 78 | oop SystemDictionary::_system_loader_lock_obj = NULL; |
duke@435 | 79 | |
coleenp@4037 | 80 | Klass* SystemDictionary::_well_known_klasses[SystemDictionary::WKID_LIMIT] |
jrose@567 | 81 | = { NULL /*, NULL...*/ }; |
duke@435 | 82 | |
coleenp@4037 | 83 | Klass* SystemDictionary::_box_klasses[T_VOID+1] = { NULL /*, NULL...*/ }; |
duke@435 | 84 | |
duke@435 | 85 | oop SystemDictionary::_java_system_loader = NULL; |
duke@435 | 86 | |
duke@435 | 87 | bool SystemDictionary::_has_loadClassInternal = false; |
duke@435 | 88 | bool SystemDictionary::_has_checkPackageAccess = false; |
duke@435 | 89 | |
duke@435 | 90 | // lazily initialized klass variables |
coleenp@4037 | 91 | Klass* volatile SystemDictionary::_abstract_ownable_synchronizer_klass = NULL; |
duke@435 | 92 | |
duke@435 | 93 | |
duke@435 | 94 | // ---------------------------------------------------------------------------- |
duke@435 | 95 | // Java-level SystemLoader |
duke@435 | 96 | |
duke@435 | 97 | oop SystemDictionary::java_system_loader() { |
duke@435 | 98 | return _java_system_loader; |
duke@435 | 99 | } |
duke@435 | 100 | |
duke@435 | 101 | void SystemDictionary::compute_java_system_loader(TRAPS) { |
never@1577 | 102 | KlassHandle system_klass(THREAD, WK_KLASS(ClassLoader_klass)); |
duke@435 | 103 | JavaValue result(T_OBJECT); |
duke@435 | 104 | JavaCalls::call_static(&result, |
never@1577 | 105 | KlassHandle(THREAD, WK_KLASS(ClassLoader_klass)), |
coleenp@2497 | 106 | vmSymbols::getSystemClassLoader_name(), |
coleenp@2497 | 107 | vmSymbols::void_classloader_signature(), |
duke@435 | 108 | CHECK); |
duke@435 | 109 | |
duke@435 | 110 | _java_system_loader = (oop)result.get_jobject(); |
duke@435 | 111 | } |
duke@435 | 112 | |
duke@435 | 113 | |
coleenp@4304 | 114 | ClassLoaderData* SystemDictionary::register_loader(Handle class_loader, TRAPS) { |
coleenp@4037 | 115 | if (class_loader() == NULL) return ClassLoaderData::the_null_class_loader_data(); |
coleenp@4304 | 116 | return ClassLoaderDataGraph::find_or_create(class_loader, CHECK_NULL); |
coleenp@4037 | 117 | } |
coleenp@4037 | 118 | |
duke@435 | 119 | // ---------------------------------------------------------------------------- |
duke@435 | 120 | // debugging |
duke@435 | 121 | |
duke@435 | 122 | #ifdef ASSERT |
duke@435 | 123 | |
duke@435 | 124 | // return true if class_name contains no '.' (internal format is '/') |
coleenp@2497 | 125 | bool SystemDictionary::is_internal_format(Symbol* class_name) { |
coleenp@2497 | 126 | if (class_name != NULL) { |
duke@435 | 127 | ResourceMark rm; |
duke@435 | 128 | char* name = class_name->as_C_string(); |
duke@435 | 129 | return strchr(name, '.') == NULL; |
duke@435 | 130 | } else { |
duke@435 | 131 | return true; |
duke@435 | 132 | } |
duke@435 | 133 | } |
duke@435 | 134 | |
duke@435 | 135 | #endif |
duke@435 | 136 | |
duke@435 | 137 | // ---------------------------------------------------------------------------- |
acorn@949 | 138 | // Parallel class loading check |
acorn@949 | 139 | |
acorn@949 | 140 | bool SystemDictionary::is_parallelCapable(Handle class_loader) { |
acorn@949 | 141 | if (UnsyncloadClass || class_loader.is_null()) return true; |
acorn@949 | 142 | if (AlwaysLockClassLoader) return false; |
never@3137 | 143 | return java_lang_ClassLoader::parallelCapable(class_loader()); |
acorn@949 | 144 | } |
acorn@949 | 145 | // ---------------------------------------------------------------------------- |
acorn@1510 | 146 | // ParallelDefineClass flag does not apply to bootclass loader |
acorn@1510 | 147 | bool SystemDictionary::is_parallelDefine(Handle class_loader) { |
acorn@1510 | 148 | if (class_loader.is_null()) return false; |
never@3137 | 149 | if (AllowParallelDefineClass && java_lang_ClassLoader::parallelCapable(class_loader())) { |
acorn@1510 | 150 | return true; |
acorn@1510 | 151 | } |
acorn@1510 | 152 | return false; |
acorn@1510 | 153 | } |
twisti@4866 | 154 | |
twisti@4866 | 155 | /** |
twisti@4866 | 156 | * Returns true if the passed class loader is the extension class loader. |
twisti@4866 | 157 | */ |
twisti@4866 | 158 | bool SystemDictionary::is_ext_class_loader(Handle class_loader) { |
twisti@4866 | 159 | if (class_loader.is_null()) { |
twisti@4866 | 160 | return false; |
twisti@4866 | 161 | } |
twisti@4866 | 162 | return (class_loader->klass()->name() == vmSymbols::sun_misc_Launcher_ExtClassLoader()); |
twisti@4866 | 163 | } |
twisti@4866 | 164 | |
acorn@1510 | 165 | // ---------------------------------------------------------------------------- |
duke@435 | 166 | // Resolving of classes |
duke@435 | 167 | |
duke@435 | 168 | // Forwards to resolve_or_null |
duke@435 | 169 | |
coleenp@4037 | 170 | Klass* SystemDictionary::resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS) { |
coleenp@4037 | 171 | Klass* klass = resolve_or_null(class_name, class_loader, protection_domain, THREAD); |
duke@435 | 172 | if (HAS_PENDING_EXCEPTION || klass == NULL) { |
duke@435 | 173 | KlassHandle k_h(THREAD, klass); |
duke@435 | 174 | // can return a null klass |
duke@435 | 175 | klass = handle_resolution_exception(class_name, class_loader, protection_domain, throw_error, k_h, THREAD); |
duke@435 | 176 | } |
duke@435 | 177 | return klass; |
duke@435 | 178 | } |
duke@435 | 179 | |
coleenp@4037 | 180 | Klass* SystemDictionary::handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS) { |
duke@435 | 181 | if (HAS_PENDING_EXCEPTION) { |
duke@435 | 182 | // If we have a pending exception we forward it to the caller, unless throw_error is true, |
duke@435 | 183 | // in which case we have to check whether the pending exception is a ClassNotFoundException, |
duke@435 | 184 | // and if so convert it to a NoClassDefFoundError |
duke@435 | 185 | // And chain the original ClassNotFoundException |
never@1577 | 186 | if (throw_error && PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass())) { |
duke@435 | 187 | ResourceMark rm(THREAD); |
duke@435 | 188 | assert(klass_h() == NULL, "Should not have result with exception pending"); |
duke@435 | 189 | Handle e(THREAD, PENDING_EXCEPTION); |
duke@435 | 190 | CLEAR_PENDING_EXCEPTION; |
acorn@4425 | 191 | THROW_MSG_CAUSE_NULL(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string(), e); |
duke@435 | 192 | } else { |
duke@435 | 193 | return NULL; |
duke@435 | 194 | } |
duke@435 | 195 | } |
duke@435 | 196 | // Class not found, throw appropriate error or exception depending on value of throw_error |
duke@435 | 197 | if (klass_h() == NULL) { |
duke@435 | 198 | ResourceMark rm(THREAD); |
duke@435 | 199 | if (throw_error) { |
acorn@4425 | 200 | THROW_MSG_NULL(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string()); |
duke@435 | 201 | } else { |
acorn@4425 | 202 | THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), class_name->as_C_string()); |
duke@435 | 203 | } |
duke@435 | 204 | } |
coleenp@4037 | 205 | return (Klass*)klass_h(); |
duke@435 | 206 | } |
duke@435 | 207 | |
duke@435 | 208 | |
coleenp@4037 | 209 | Klass* SystemDictionary::resolve_or_fail(Symbol* class_name, |
duke@435 | 210 | bool throw_error, TRAPS) |
duke@435 | 211 | { |
duke@435 | 212 | return resolve_or_fail(class_name, Handle(), Handle(), throw_error, THREAD); |
duke@435 | 213 | } |
duke@435 | 214 | |
duke@435 | 215 | |
duke@435 | 216 | // Forwards to resolve_instance_class_or_null |
duke@435 | 217 | |
coleenp@4037 | 218 | Klass* SystemDictionary::resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS) { |
twisti@3969 | 219 | assert(!THREAD->is_Compiler_thread(), |
twisti@3969 | 220 | err_msg("can not load classes with compiler thread: class=%s, classloader=%s", |
twisti@3969 | 221 | class_name->as_C_string(), |
coleenp@4037 | 222 | class_loader.is_null() ? "null" : class_loader->klass()->name()->as_C_string())); |
coleenp@2497 | 223 | if (FieldType::is_array(class_name)) { |
duke@435 | 224 | return resolve_array_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); |
coleenp@2497 | 225 | } else if (FieldType::is_obj(class_name)) { |
coleenp@2497 | 226 | ResourceMark rm(THREAD); |
coleenp@2497 | 227 | // Ignore wrapping L and ;. |
coleenp@2497 | 228 | TempNewSymbol name = SymbolTable::new_symbol(class_name->as_C_string() + 1, |
coleenp@2497 | 229 | class_name->utf8_length() - 2, CHECK_NULL); |
coleenp@2497 | 230 | return resolve_instance_class_or_null(name, class_loader, protection_domain, CHECK_NULL); |
duke@435 | 231 | } else { |
duke@435 | 232 | return resolve_instance_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); |
duke@435 | 233 | } |
duke@435 | 234 | } |
duke@435 | 235 | |
coleenp@4037 | 236 | Klass* SystemDictionary::resolve_or_null(Symbol* class_name, TRAPS) { |
duke@435 | 237 | return resolve_or_null(class_name, Handle(), Handle(), THREAD); |
duke@435 | 238 | } |
duke@435 | 239 | |
duke@435 | 240 | // Forwards to resolve_instance_class_or_null |
duke@435 | 241 | |
coleenp@4037 | 242 | Klass* SystemDictionary::resolve_array_class_or_null(Symbol* class_name, |
duke@435 | 243 | Handle class_loader, |
duke@435 | 244 | Handle protection_domain, |
duke@435 | 245 | TRAPS) { |
coleenp@2497 | 246 | assert(FieldType::is_array(class_name), "must be array"); |
coleenp@4037 | 247 | Klass* k = NULL; |
coleenp@2497 | 248 | FieldArrayInfo fd; |
coleenp@2497 | 249 | // dimension and object_key in FieldArrayInfo are assigned as a side-effect |
coleenp@2497 | 250 | // of this call |
coleenp@2497 | 251 | BasicType t = FieldType::get_array_info(class_name, fd, CHECK_NULL); |
duke@435 | 252 | if (t == T_OBJECT) { |
duke@435 | 253 | // naked oop "k" is OK here -- we assign back into it |
coleenp@2497 | 254 | k = SystemDictionary::resolve_instance_class_or_null(fd.object_key(), |
duke@435 | 255 | class_loader, |
duke@435 | 256 | protection_domain, |
duke@435 | 257 | CHECK_NULL); |
duke@435 | 258 | if (k != NULL) { |
hseigel@4278 | 259 | k = k->array_klass(fd.dimension(), CHECK_NULL); |
duke@435 | 260 | } |
duke@435 | 261 | } else { |
duke@435 | 262 | k = Universe::typeArrayKlassObj(t); |
coleenp@4142 | 263 | k = TypeArrayKlass::cast(k)->array_klass(fd.dimension(), CHECK_NULL); |
duke@435 | 264 | } |
duke@435 | 265 | return k; |
duke@435 | 266 | } |
duke@435 | 267 | |
duke@435 | 268 | |
duke@435 | 269 | // Must be called for any super-class or super-interface resolution |
duke@435 | 270 | // during class definition to allow class circularity checking |
duke@435 | 271 | // super-interface callers: |
duke@435 | 272 | // parse_interfaces - for defineClass & jvmtiRedefineClasses |
duke@435 | 273 | // super-class callers: |
duke@435 | 274 | // ClassFileParser - for defineClass & jvmtiRedefineClasses |
duke@435 | 275 | // load_shared_class - while loading a class from shared archive |
acorn@949 | 276 | // resolve_instance_class_or_null: |
acorn@949 | 277 | // via: handle_parallel_super_load |
duke@435 | 278 | // when resolving a class that has an existing placeholder with |
duke@435 | 279 | // a saved superclass [i.e. a defineClass is currently in progress] |
duke@435 | 280 | // if another thread is trying to resolve the class, it must do |
duke@435 | 281 | // super-class checks on its own thread to catch class circularity |
duke@435 | 282 | // This last call is critical in class circularity checking for cases |
duke@435 | 283 | // where classloading is delegated to different threads and the |
duke@435 | 284 | // classloader lock is released. |
duke@435 | 285 | // Take the case: Base->Super->Base |
duke@435 | 286 | // 1. If thread T1 tries to do a defineClass of class Base |
duke@435 | 287 | // resolve_super_or_fail creates placeholder: T1, Base (super Super) |
duke@435 | 288 | // 2. resolve_instance_class_or_null does not find SD or placeholder for Super |
duke@435 | 289 | // so it tries to load Super |
duke@435 | 290 | // 3. If we load the class internally, or user classloader uses same thread |
duke@435 | 291 | // loadClassFromxxx or defineClass via parseClassFile Super ... |
duke@435 | 292 | // 3.1 resolve_super_or_fail creates placeholder: T1, Super (super Base) |
duke@435 | 293 | // 3.3 resolve_instance_class_or_null Base, finds placeholder for Base |
duke@435 | 294 | // 3.4 calls resolve_super_or_fail Base |
duke@435 | 295 | // 3.5 finds T1,Base -> throws class circularity |
duke@435 | 296 | //OR 4. If T2 tries to resolve Super via defineClass Super ... |
duke@435 | 297 | // 4.1 resolve_super_or_fail creates placeholder: T2, Super (super Base) |
duke@435 | 298 | // 4.2 resolve_instance_class_or_null Base, finds placeholder for Base (super Super) |
duke@435 | 299 | // 4.3 calls resolve_super_or_fail Super in parallel on own thread T2 |
duke@435 | 300 | // 4.4 finds T2, Super -> throws class circularity |
duke@435 | 301 | // Must be called, even if superclass is null, since this is |
duke@435 | 302 | // where the placeholder entry is created which claims this |
duke@435 | 303 | // thread is loading this class/classloader. |
coleenp@4037 | 304 | Klass* SystemDictionary::resolve_super_or_fail(Symbol* child_name, |
coleenp@2497 | 305 | Symbol* class_name, |
duke@435 | 306 | Handle class_loader, |
duke@435 | 307 | Handle protection_domain, |
duke@435 | 308 | bool is_superclass, |
duke@435 | 309 | TRAPS) { |
duke@435 | 310 | // Double-check, if child class is already loaded, just return super-class,interface |
duke@435 | 311 | // Don't add a placedholder if already loaded, i.e. already in system dictionary |
duke@435 | 312 | // Make sure there's a placeholder for the *child* before resolving. |
duke@435 | 313 | // Used as a claim that this thread is currently loading superclass/classloader |
duke@435 | 314 | // Used here for ClassCircularity checks and also for heap verification |
coleenp@4037 | 315 | // (every InstanceKlass in the heap needs to be in the system dictionary |
duke@435 | 316 | // or have a placeholder). |
duke@435 | 317 | // Must check ClassCircularity before checking if super class is already loaded |
duke@435 | 318 | // |
duke@435 | 319 | // We might not already have a placeholder if this child_name was |
duke@435 | 320 | // first seen via resolve_from_stream (jni_DefineClass or JVM_DefineClass); |
duke@435 | 321 | // the name of the class might not be known until the stream is actually |
duke@435 | 322 | // parsed. |
duke@435 | 323 | // Bugs 4643874, 4715493 |
duke@435 | 324 | // compute_hash can have a safepoint |
duke@435 | 325 | |
coleenp@4037 | 326 | ClassLoaderData* loader_data = class_loader_data(class_loader); |
coleenp@4037 | 327 | unsigned int d_hash = dictionary()->compute_hash(child_name, loader_data); |
duke@435 | 328 | int d_index = dictionary()->hash_to_index(d_hash); |
coleenp@4037 | 329 | unsigned int p_hash = placeholders()->compute_hash(child_name, loader_data); |
duke@435 | 330 | int p_index = placeholders()->hash_to_index(p_hash); |
duke@435 | 331 | // can't throw error holding a lock |
duke@435 | 332 | bool child_already_loaded = false; |
duke@435 | 333 | bool throw_circularity_error = false; |
duke@435 | 334 | { |
duke@435 | 335 | MutexLocker mu(SystemDictionary_lock, THREAD); |
coleenp@4037 | 336 | Klass* childk = find_class(d_index, d_hash, child_name, loader_data); |
coleenp@4037 | 337 | Klass* quicksuperk; |
duke@435 | 338 | // to support // loading: if child done loading, just return superclass |
duke@435 | 339 | // if class_name, & class_loader don't match: |
duke@435 | 340 | // if initial define, SD update will give LinkageError |
duke@435 | 341 | // if redefine: compare_class_versions will give HIERARCHY_CHANGED |
duke@435 | 342 | // so we don't throw an exception here. |
duke@435 | 343 | // see: nsk redefclass014 & java.lang.instrument Instrument032 |
duke@435 | 344 | if ((childk != NULL ) && (is_superclass) && |
coleenp@4037 | 345 | ((quicksuperk = InstanceKlass::cast(childk)->super()) != NULL) && |
duke@435 | 346 | |
hseigel@4278 | 347 | ((quicksuperk->name() == class_name) && |
hseigel@4278 | 348 | (quicksuperk->class_loader() == class_loader()))) { |
duke@435 | 349 | return quicksuperk; |
duke@435 | 350 | } else { |
coleenp@4037 | 351 | PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, loader_data); |
duke@435 | 352 | if (probe && probe->check_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER)) { |
duke@435 | 353 | throw_circularity_error = true; |
duke@435 | 354 | } |
acorn@949 | 355 | } |
acorn@949 | 356 | if (!throw_circularity_error) { |
coleenp@4037 | 357 | PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, child_name, loader_data, PlaceholderTable::LOAD_SUPER, class_name, THREAD); |
duke@435 | 358 | } |
duke@435 | 359 | } |
duke@435 | 360 | if (throw_circularity_error) { |
duke@435 | 361 | ResourceMark rm(THREAD); |
acorn@4425 | 362 | THROW_MSG_NULL(vmSymbols::java_lang_ClassCircularityError(), child_name->as_C_string()); |
duke@435 | 363 | } |
duke@435 | 364 | |
duke@435 | 365 | // java.lang.Object should have been found above |
coleenp@2497 | 366 | assert(class_name != NULL, "null super class for resolving"); |
duke@435 | 367 | // Resolve the super class or interface, check results on return |
acorn@4425 | 368 | Klass* superk = SystemDictionary::resolve_or_null(class_name, |
duke@435 | 369 | class_loader, |
duke@435 | 370 | protection_domain, |
duke@435 | 371 | THREAD); |
duke@435 | 372 | |
duke@435 | 373 | KlassHandle superk_h(THREAD, superk); |
duke@435 | 374 | |
acorn@4425 | 375 | // Clean up of placeholders moved so that each classloadAction registrar self-cleans up |
acorn@4425 | 376 | // It is no longer necessary to keep the placeholder table alive until update_dictionary |
acorn@4425 | 377 | // or error. GC used to walk the placeholder table as strong roots. |
acorn@4425 | 378 | // The instanceKlass is kept alive because the class loader is on the stack, |
acorn@4425 | 379 | // which keeps the loader_data alive, as well as all instanceKlasses in |
acorn@4425 | 380 | // the loader_data. parseClassFile adds the instanceKlass to loader_data. |
duke@435 | 381 | { |
acorn@4425 | 382 | MutexLocker mu(SystemDictionary_lock, THREAD); |
acorn@4425 | 383 | placeholders()->find_and_remove(p_index, p_hash, child_name, loader_data, PlaceholderTable::LOAD_SUPER, THREAD); |
acorn@4425 | 384 | SystemDictionary_lock->notify_all(); |
duke@435 | 385 | } |
duke@435 | 386 | if (HAS_PENDING_EXCEPTION || superk_h() == NULL) { |
duke@435 | 387 | // can null superk |
duke@435 | 388 | superk_h = KlassHandle(THREAD, handle_resolution_exception(class_name, class_loader, protection_domain, true, superk_h, THREAD)); |
duke@435 | 389 | } |
duke@435 | 390 | |
duke@435 | 391 | return superk_h(); |
duke@435 | 392 | } |
duke@435 | 393 | |
duke@435 | 394 | void SystemDictionary::validate_protection_domain(instanceKlassHandle klass, |
duke@435 | 395 | Handle class_loader, |
duke@435 | 396 | Handle protection_domain, |
duke@435 | 397 | TRAPS) { |
duke@435 | 398 | if(!has_checkPackageAccess()) return; |
duke@435 | 399 | |
duke@435 | 400 | // Now we have to call back to java to check if the initating class has access |
duke@435 | 401 | JavaValue result(T_VOID); |
duke@435 | 402 | if (TraceProtectionDomainVerification) { |
duke@435 | 403 | // Print out trace information |
duke@435 | 404 | tty->print_cr("Checking package access"); |
duke@435 | 405 | tty->print(" - class loader: "); class_loader()->print_value_on(tty); tty->cr(); |
duke@435 | 406 | tty->print(" - protection domain: "); protection_domain()->print_value_on(tty); tty->cr(); |
duke@435 | 407 | tty->print(" - loading: "); klass()->print_value_on(tty); tty->cr(); |
duke@435 | 408 | } |
duke@435 | 409 | |
never@1577 | 410 | KlassHandle system_loader(THREAD, SystemDictionary::ClassLoader_klass()); |
duke@435 | 411 | JavaCalls::call_special(&result, |
duke@435 | 412 | class_loader, |
duke@435 | 413 | system_loader, |
coleenp@2497 | 414 | vmSymbols::checkPackageAccess_name(), |
coleenp@2497 | 415 | vmSymbols::class_protectiondomain_signature(), |
duke@435 | 416 | Handle(THREAD, klass->java_mirror()), |
duke@435 | 417 | protection_domain, |
duke@435 | 418 | THREAD); |
duke@435 | 419 | |
duke@435 | 420 | if (TraceProtectionDomainVerification) { |
duke@435 | 421 | if (HAS_PENDING_EXCEPTION) { |
duke@435 | 422 | tty->print_cr(" -> DENIED !!!!!!!!!!!!!!!!!!!!!"); |
duke@435 | 423 | } else { |
duke@435 | 424 | tty->print_cr(" -> granted"); |
duke@435 | 425 | } |
duke@435 | 426 | tty->cr(); |
duke@435 | 427 | } |
duke@435 | 428 | |
duke@435 | 429 | if (HAS_PENDING_EXCEPTION) return; |
duke@435 | 430 | |
duke@435 | 431 | // If no exception has been thrown, we have validated the protection domain |
duke@435 | 432 | // Insert the protection domain of the initiating class into the set. |
duke@435 | 433 | { |
duke@435 | 434 | // We recalculate the entry here -- we've called out to java since |
duke@435 | 435 | // the last time it was calculated. |
coleenp@4037 | 436 | ClassLoaderData* loader_data = class_loader_data(class_loader); |
coleenp@4037 | 437 | |
coleenp@2497 | 438 | Symbol* kn = klass->name(); |
coleenp@4037 | 439 | unsigned int d_hash = dictionary()->compute_hash(kn, loader_data); |
duke@435 | 440 | int d_index = dictionary()->hash_to_index(d_hash); |
duke@435 | 441 | |
duke@435 | 442 | MutexLocker mu(SystemDictionary_lock, THREAD); |
duke@435 | 443 | { |
duke@435 | 444 | // Note that we have an entry, and entries can be deleted only during GC, |
duke@435 | 445 | // so we cannot allow GC to occur while we're holding this entry. |
duke@435 | 446 | |
duke@435 | 447 | // We're using a No_Safepoint_Verifier to catch any place where we |
duke@435 | 448 | // might potentially do a GC at all. |
acorn@4425 | 449 | // Dictionary::do_unloading() asserts that classes in SD are only |
acorn@4425 | 450 | // unloaded at a safepoint. Anonymous classes are not in SD. |
duke@435 | 451 | No_Safepoint_Verifier nosafepoint; |
coleenp@4037 | 452 | dictionary()->add_protection_domain(d_index, d_hash, klass, loader_data, |
duke@435 | 453 | protection_domain, THREAD); |
duke@435 | 454 | } |
duke@435 | 455 | } |
duke@435 | 456 | } |
duke@435 | 457 | |
duke@435 | 458 | // We only get here if this thread finds that another thread |
duke@435 | 459 | // has already claimed the placeholder token for the current operation, |
duke@435 | 460 | // but that other thread either never owned or gave up the |
duke@435 | 461 | // object lock |
duke@435 | 462 | // Waits on SystemDictionary_lock to indicate placeholder table updated |
duke@435 | 463 | // On return, caller must recheck placeholder table state |
duke@435 | 464 | // |
duke@435 | 465 | // We only get here if |
duke@435 | 466 | // 1) custom classLoader, i.e. not bootstrap classloader |
duke@435 | 467 | // 2) UnsyncloadClass not set |
duke@435 | 468 | // 3) custom classLoader has broken the class loader objectLock |
duke@435 | 469 | // so another thread got here in parallel |
duke@435 | 470 | // |
duke@435 | 471 | // lockObject must be held. |
duke@435 | 472 | // Complicated dance due to lock ordering: |
duke@435 | 473 | // Must first release the classloader object lock to |
duke@435 | 474 | // allow initial definer to complete the class definition |
duke@435 | 475 | // and to avoid deadlock |
duke@435 | 476 | // Reclaim classloader lock object with same original recursion count |
duke@435 | 477 | // Must release SystemDictionary_lock after notify, since |
duke@435 | 478 | // class loader lock must be claimed before SystemDictionary_lock |
duke@435 | 479 | // to prevent deadlocks |
duke@435 | 480 | // |
duke@435 | 481 | // The notify allows applications that did an untimed wait() on |
duke@435 | 482 | // the classloader object lock to not hang. |
duke@435 | 483 | void SystemDictionary::double_lock_wait(Handle lockObject, TRAPS) { |
duke@435 | 484 | assert_lock_strong(SystemDictionary_lock); |
duke@435 | 485 | |
duke@435 | 486 | bool calledholdinglock |
duke@435 | 487 | = ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, lockObject); |
duke@435 | 488 | assert(calledholdinglock,"must hold lock for notify"); |
acorn@949 | 489 | assert((!(lockObject() == _system_loader_lock_obj) && !is_parallelCapable(lockObject)), "unexpected double_lock_wait"); |
duke@435 | 490 | ObjectSynchronizer::notifyall(lockObject, THREAD); |
duke@435 | 491 | intptr_t recursions = ObjectSynchronizer::complete_exit(lockObject, THREAD); |
duke@435 | 492 | SystemDictionary_lock->wait(); |
duke@435 | 493 | SystemDictionary_lock->unlock(); |
duke@435 | 494 | ObjectSynchronizer::reenter(lockObject, recursions, THREAD); |
duke@435 | 495 | SystemDictionary_lock->lock(); |
duke@435 | 496 | } |
duke@435 | 497 | |
duke@435 | 498 | // If the class in is in the placeholder table, class loading is in progress |
duke@435 | 499 | // For cases where the application changes threads to load classes, it |
duke@435 | 500 | // is critical to ClassCircularity detection that we try loading |
duke@435 | 501 | // the superclass on the same thread internally, so we do parallel |
duke@435 | 502 | // super class loading here. |
duke@435 | 503 | // This also is critical in cases where the original thread gets stalled |
duke@435 | 504 | // even in non-circularity situations. |
duke@435 | 505 | // Note: must call resolve_super_or_fail even if null super - |
acorn@949 | 506 | // to force placeholder entry creation for this class for circularity detection |
duke@435 | 507 | // Caller must check for pending exception |
coleenp@4037 | 508 | // Returns non-null Klass* if other thread has completed load |
duke@435 | 509 | // and we are done, |
coleenp@4037 | 510 | // If return null Klass* and no pending exception, the caller must load the class |
duke@435 | 511 | instanceKlassHandle SystemDictionary::handle_parallel_super_load( |
coleenp@2497 | 512 | Symbol* name, Symbol* superclassname, Handle class_loader, |
duke@435 | 513 | Handle protection_domain, Handle lockObject, TRAPS) { |
duke@435 | 514 | |
duke@435 | 515 | instanceKlassHandle nh = instanceKlassHandle(); // null Handle |
coleenp@4037 | 516 | ClassLoaderData* loader_data = class_loader_data(class_loader); |
coleenp@4037 | 517 | unsigned int d_hash = dictionary()->compute_hash(name, loader_data); |
duke@435 | 518 | int d_index = dictionary()->hash_to_index(d_hash); |
coleenp@4037 | 519 | unsigned int p_hash = placeholders()->compute_hash(name, loader_data); |
duke@435 | 520 | int p_index = placeholders()->hash_to_index(p_hash); |
duke@435 | 521 | |
duke@435 | 522 | // superk is not used, resolve_super called for circularity check only |
duke@435 | 523 | // This code is reached in two situations. One if this thread |
duke@435 | 524 | // is loading the same class twice (e.g. ClassCircularity, or |
duke@435 | 525 | // java.lang.instrument). |
duke@435 | 526 | // The second is if another thread started the resolve_super first |
duke@435 | 527 | // and has not yet finished. |
duke@435 | 528 | // In both cases the original caller will clean up the placeholder |
duke@435 | 529 | // entry on error. |
coleenp@4037 | 530 | Klass* superk = SystemDictionary::resolve_super_or_fail(name, |
duke@435 | 531 | superclassname, |
duke@435 | 532 | class_loader, |
duke@435 | 533 | protection_domain, |
duke@435 | 534 | true, |
duke@435 | 535 | CHECK_(nh)); |
duke@435 | 536 | |
acorn@949 | 537 | // parallelCapable class loaders do NOT wait for parallel superclass loads to complete |
acorn@949 | 538 | // Serial class loaders and bootstrap classloader do wait for superclass loads |
acorn@949 | 539 | if (!class_loader.is_null() && is_parallelCapable(class_loader)) { |
duke@435 | 540 | MutexLocker mu(SystemDictionary_lock, THREAD); |
duke@435 | 541 | // Check if classloading completed while we were loading superclass or waiting |
coleenp@4037 | 542 | Klass* check = find_class(d_index, d_hash, name, loader_data); |
duke@435 | 543 | if (check != NULL) { |
duke@435 | 544 | // Klass is already loaded, so just return it |
duke@435 | 545 | return(instanceKlassHandle(THREAD, check)); |
duke@435 | 546 | } else { |
duke@435 | 547 | return nh; |
duke@435 | 548 | } |
duke@435 | 549 | } |
duke@435 | 550 | |
duke@435 | 551 | // must loop to both handle other placeholder updates |
duke@435 | 552 | // and spurious notifications |
duke@435 | 553 | bool super_load_in_progress = true; |
duke@435 | 554 | PlaceholderEntry* placeholder; |
duke@435 | 555 | while (super_load_in_progress) { |
duke@435 | 556 | MutexLocker mu(SystemDictionary_lock, THREAD); |
duke@435 | 557 | // Check if classloading completed while we were loading superclass or waiting |
coleenp@4037 | 558 | Klass* check = find_class(d_index, d_hash, name, loader_data); |
duke@435 | 559 | if (check != NULL) { |
duke@435 | 560 | // Klass is already loaded, so just return it |
duke@435 | 561 | return(instanceKlassHandle(THREAD, check)); |
duke@435 | 562 | } else { |
coleenp@4037 | 563 | placeholder = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
duke@435 | 564 | if (placeholder && placeholder->super_load_in_progress() ){ |
duke@435 | 565 | // Before UnsyncloadClass: |
duke@435 | 566 | // We only get here if the application has released the |
duke@435 | 567 | // classloader lock when another thread was in the middle of loading a |
duke@435 | 568 | // superclass/superinterface for this class, and now |
duke@435 | 569 | // this thread is also trying to load this class. |
duke@435 | 570 | // To minimize surprises, the first thread that started to |
duke@435 | 571 | // load a class should be the one to complete the loading |
duke@435 | 572 | // with the classfile it initially expected. |
duke@435 | 573 | // This logic has the current thread wait once it has done |
duke@435 | 574 | // all the superclass/superinterface loading it can, until |
duke@435 | 575 | // the original thread completes the class loading or fails |
coleenp@4037 | 576 | // If it completes we will use the resulting InstanceKlass |
duke@435 | 577 | // which we will find below in the systemDictionary. |
duke@435 | 578 | // We also get here for parallel bootstrap classloader |
duke@435 | 579 | if (class_loader.is_null()) { |
duke@435 | 580 | SystemDictionary_lock->wait(); |
duke@435 | 581 | } else { |
duke@435 | 582 | double_lock_wait(lockObject, THREAD); |
duke@435 | 583 | } |
duke@435 | 584 | } else { |
duke@435 | 585 | // If not in SD and not in PH, other thread's load must have failed |
duke@435 | 586 | super_load_in_progress = false; |
duke@435 | 587 | } |
duke@435 | 588 | } |
duke@435 | 589 | } |
duke@435 | 590 | return (nh); |
duke@435 | 591 | } |
duke@435 | 592 | |
duke@435 | 593 | |
sla@5237 | 594 | Klass* SystemDictionary::resolve_instance_class_or_null(Symbol* name, |
sla@5237 | 595 | Handle class_loader, |
sla@5237 | 596 | Handle protection_domain, |
sla@5237 | 597 | TRAPS) { |
coleenp@2497 | 598 | assert(name != NULL && !FieldType::is_array(name) && |
coleenp@2497 | 599 | !FieldType::is_obj(name), "invalid class name"); |
duke@435 | 600 | |
sla@5237 | 601 | TracingTime class_load_start_time = Tracing::time(); |
sla@5237 | 602 | |
duke@435 | 603 | // UseNewReflection |
duke@435 | 604 | // Fix for 4474172; see evaluation for more details |
duke@435 | 605 | class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); |
coleenp@4304 | 606 | ClassLoaderData *loader_data = register_loader(class_loader, CHECK_NULL); |
duke@435 | 607 | |
duke@435 | 608 | // Do lookup to see if class already exist and the protection domain |
duke@435 | 609 | // has the right access |
acorn@4425 | 610 | // This call uses find which checks protection domain already matches |
acorn@4425 | 611 | // All subsequent calls use find_class, and set has_loaded_class so that |
acorn@4425 | 612 | // before we return a result we call out to java to check for valid protection domain |
acorn@4425 | 613 | // to allow returning the Klass* and add it to the pd_set if it is valid |
coleenp@4037 | 614 | unsigned int d_hash = dictionary()->compute_hash(name, loader_data); |
duke@435 | 615 | int d_index = dictionary()->hash_to_index(d_hash); |
coleenp@4037 | 616 | Klass* probe = dictionary()->find(d_index, d_hash, name, loader_data, |
duke@435 | 617 | protection_domain, THREAD); |
duke@435 | 618 | if (probe != NULL) return probe; |
duke@435 | 619 | |
duke@435 | 620 | |
duke@435 | 621 | // Non-bootstrap class loaders will call out to class loader and |
duke@435 | 622 | // define via jvm/jni_DefineClass which will acquire the |
duke@435 | 623 | // class loader object lock to protect against multiple threads |
duke@435 | 624 | // defining the class in parallel by accident. |
duke@435 | 625 | // This lock must be acquired here so the waiter will find |
duke@435 | 626 | // any successful result in the SystemDictionary and not attempt |
duke@435 | 627 | // the define |
acorn@949 | 628 | // ParallelCapable Classloaders and the bootstrap classloader, |
duke@435 | 629 | // or all classloaders with UnsyncloadClass do not acquire lock here |
duke@435 | 630 | bool DoObjectLock = true; |
acorn@949 | 631 | if (is_parallelCapable(class_loader)) { |
duke@435 | 632 | DoObjectLock = false; |
duke@435 | 633 | } |
duke@435 | 634 | |
coleenp@4037 | 635 | unsigned int p_hash = placeholders()->compute_hash(name, loader_data); |
duke@435 | 636 | int p_index = placeholders()->hash_to_index(p_hash); |
duke@435 | 637 | |
duke@435 | 638 | // Class is not in SystemDictionary so we have to do loading. |
duke@435 | 639 | // Make sure we are synchronized on the class loader before we proceed |
duke@435 | 640 | Handle lockObject = compute_loader_lock_object(class_loader, THREAD); |
duke@435 | 641 | check_loader_lock_contention(lockObject, THREAD); |
duke@435 | 642 | ObjectLocker ol(lockObject, THREAD, DoObjectLock); |
duke@435 | 643 | |
duke@435 | 644 | // Check again (after locking) if class already exist in SystemDictionary |
duke@435 | 645 | bool class_has_been_loaded = false; |
duke@435 | 646 | bool super_load_in_progress = false; |
duke@435 | 647 | bool havesupername = false; |
duke@435 | 648 | instanceKlassHandle k; |
duke@435 | 649 | PlaceholderEntry* placeholder; |
coleenp@2497 | 650 | Symbol* superclassname = NULL; |
duke@435 | 651 | |
duke@435 | 652 | { |
duke@435 | 653 | MutexLocker mu(SystemDictionary_lock, THREAD); |
coleenp@4037 | 654 | Klass* check = find_class(d_index, d_hash, name, loader_data); |
duke@435 | 655 | if (check != NULL) { |
duke@435 | 656 | // Klass is already loaded, so just return it |
duke@435 | 657 | class_has_been_loaded = true; |
duke@435 | 658 | k = instanceKlassHandle(THREAD, check); |
duke@435 | 659 | } else { |
coleenp@4037 | 660 | placeholder = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
duke@435 | 661 | if (placeholder && placeholder->super_load_in_progress()) { |
duke@435 | 662 | super_load_in_progress = true; |
duke@435 | 663 | if (placeholder->havesupername() == true) { |
coleenp@2497 | 664 | superclassname = placeholder->supername(); |
duke@435 | 665 | havesupername = true; |
duke@435 | 666 | } |
duke@435 | 667 | } |
duke@435 | 668 | } |
duke@435 | 669 | } |
duke@435 | 670 | |
acorn@4425 | 671 | // If the class is in the placeholder table, class loading is in progress |
duke@435 | 672 | if (super_load_in_progress && havesupername==true) { |
duke@435 | 673 | k = SystemDictionary::handle_parallel_super_load(name, superclassname, |
duke@435 | 674 | class_loader, protection_domain, lockObject, THREAD); |
duke@435 | 675 | if (HAS_PENDING_EXCEPTION) { |
duke@435 | 676 | return NULL; |
duke@435 | 677 | } |
duke@435 | 678 | if (!k.is_null()) { |
duke@435 | 679 | class_has_been_loaded = true; |
duke@435 | 680 | } |
duke@435 | 681 | } |
duke@435 | 682 | |
acorn@4425 | 683 | bool throw_circularity_error = false; |
duke@435 | 684 | if (!class_has_been_loaded) { |
acorn@4425 | 685 | bool load_instance_added = false; |
duke@435 | 686 | |
duke@435 | 687 | // add placeholder entry to record loading instance class |
duke@435 | 688 | // Five cases: |
duke@435 | 689 | // All cases need to prevent modifying bootclasssearchpath |
duke@435 | 690 | // in parallel with a classload of same classname |
acorn@949 | 691 | // Redefineclasses uses existence of the placeholder for the duration |
acorn@949 | 692 | // of the class load to prevent concurrent redefinition of not completely |
acorn@949 | 693 | // defined classes. |
duke@435 | 694 | // case 1. traditional classloaders that rely on the classloader object lock |
duke@435 | 695 | // - no other need for LOAD_INSTANCE |
duke@435 | 696 | // case 2. traditional classloaders that break the classloader object lock |
duke@435 | 697 | // as a deadlock workaround. Detection of this case requires that |
duke@435 | 698 | // this check is done while holding the classloader object lock, |
duke@435 | 699 | // and that lock is still held when calling classloader's loadClass. |
duke@435 | 700 | // For these classloaders, we ensure that the first requestor |
duke@435 | 701 | // completes the load and other requestors wait for completion. |
duke@435 | 702 | // case 3. UnsyncloadClass - don't use objectLocker |
duke@435 | 703 | // With this flag, we allow parallel classloading of a |
duke@435 | 704 | // class/classloader pair |
duke@435 | 705 | // case4. Bootstrap classloader - don't own objectLocker |
duke@435 | 706 | // This classloader supports parallelism at the classloader level, |
duke@435 | 707 | // but only allows a single load of a class/classloader pair. |
duke@435 | 708 | // No performance benefit and no deadlock issues. |
acorn@949 | 709 | // case 5. parallelCapable user level classloaders - without objectLocker |
acorn@949 | 710 | // Allow parallel classloading of a class/classloader pair |
acorn@4425 | 711 | |
duke@435 | 712 | { |
duke@435 | 713 | MutexLocker mu(SystemDictionary_lock, THREAD); |
acorn@949 | 714 | if (class_loader.is_null() || !is_parallelCapable(class_loader)) { |
coleenp@4037 | 715 | PlaceholderEntry* oldprobe = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
duke@435 | 716 | if (oldprobe) { |
duke@435 | 717 | // only need check_seen_thread once, not on each loop |
duke@435 | 718 | // 6341374 java/lang/Instrument with -Xcomp |
duke@435 | 719 | if (oldprobe->check_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE)) { |
duke@435 | 720 | throw_circularity_error = true; |
duke@435 | 721 | } else { |
duke@435 | 722 | // case 1: traditional: should never see load_in_progress. |
duke@435 | 723 | while (!class_has_been_loaded && oldprobe && oldprobe->instance_load_in_progress()) { |
duke@435 | 724 | |
duke@435 | 725 | // case 4: bootstrap classloader: prevent futile classloading, |
duke@435 | 726 | // wait on first requestor |
duke@435 | 727 | if (class_loader.is_null()) { |
duke@435 | 728 | SystemDictionary_lock->wait(); |
duke@435 | 729 | } else { |
duke@435 | 730 | // case 2: traditional with broken classloader lock. wait on first |
duke@435 | 731 | // requestor. |
duke@435 | 732 | double_lock_wait(lockObject, THREAD); |
duke@435 | 733 | } |
duke@435 | 734 | // Check if classloading completed while we were waiting |
coleenp@4037 | 735 | Klass* check = find_class(d_index, d_hash, name, loader_data); |
duke@435 | 736 | if (check != NULL) { |
duke@435 | 737 | // Klass is already loaded, so just return it |
duke@435 | 738 | k = instanceKlassHandle(THREAD, check); |
duke@435 | 739 | class_has_been_loaded = true; |
duke@435 | 740 | } |
duke@435 | 741 | // check if other thread failed to load and cleaned up |
coleenp@4037 | 742 | oldprobe = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
duke@435 | 743 | } |
duke@435 | 744 | } |
duke@435 | 745 | } |
duke@435 | 746 | } |
acorn@4425 | 747 | // All cases: add LOAD_INSTANCE holding SystemDictionary_lock |
acorn@949 | 748 | // case 3: UnsyncloadClass || case 5: parallelCapable: allow competing threads to try |
duke@435 | 749 | // LOAD_INSTANCE in parallel |
acorn@4425 | 750 | |
acorn@949 | 751 | if (!throw_circularity_error && !class_has_been_loaded) { |
coleenp@4037 | 752 | PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, name, loader_data, PlaceholderTable::LOAD_INSTANCE, NULL, THREAD); |
acorn@4425 | 753 | load_instance_added = true; |
duke@435 | 754 | // For class loaders that do not acquire the classloader object lock, |
duke@435 | 755 | // if they did not catch another thread holding LOAD_INSTANCE, |
duke@435 | 756 | // need a check analogous to the acquire ObjectLocker/find_class |
duke@435 | 757 | // i.e. now that we hold the LOAD_INSTANCE token on loading this class/CL |
duke@435 | 758 | // one final check if the load has already completed |
acorn@949 | 759 | // class loaders holding the ObjectLock shouldn't find the class here |
coleenp@4037 | 760 | Klass* check = find_class(d_index, d_hash, name, loader_data); |
duke@435 | 761 | if (check != NULL) { |
acorn@4425 | 762 | // Klass is already loaded, so return it after checking/adding protection domain |
duke@435 | 763 | k = instanceKlassHandle(THREAD, check); |
duke@435 | 764 | class_has_been_loaded = true; |
duke@435 | 765 | } |
duke@435 | 766 | } |
duke@435 | 767 | } |
acorn@4425 | 768 | |
duke@435 | 769 | // must throw error outside of owning lock |
duke@435 | 770 | if (throw_circularity_error) { |
acorn@4425 | 771 | assert(!HAS_PENDING_EXCEPTION && load_instance_added == false,"circularity error cleanup"); |
duke@435 | 772 | ResourceMark rm(THREAD); |
acorn@4425 | 773 | THROW_MSG_NULL(vmSymbols::java_lang_ClassCircularityError(), name->as_C_string()); |
duke@435 | 774 | } |
duke@435 | 775 | |
duke@435 | 776 | if (!class_has_been_loaded) { |
duke@435 | 777 | |
duke@435 | 778 | // Do actual loading |
duke@435 | 779 | k = load_instance_class(name, class_loader, THREAD); |
duke@435 | 780 | |
acorn@1510 | 781 | // For UnsyncloadClass only |
duke@435 | 782 | // If they got a linkageError, check if a parallel class load succeeded. |
duke@435 | 783 | // If it did, then for bytecode resolution the specification requires |
duke@435 | 784 | // that we return the same result we did for the other thread, i.e. the |
coleenp@4037 | 785 | // successfully loaded InstanceKlass |
duke@435 | 786 | // Should not get here for classloaders that support parallelism |
acorn@1510 | 787 | // with the new cleaner mechanism, even with AllowParallelDefineClass |
acorn@949 | 788 | // Bootstrap goes through here to allow for an extra guarantee check |
duke@435 | 789 | if (UnsyncloadClass || (class_loader.is_null())) { |
duke@435 | 790 | if (k.is_null() && HAS_PENDING_EXCEPTION |
never@1577 | 791 | && PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { |
duke@435 | 792 | MutexLocker mu(SystemDictionary_lock, THREAD); |
coleenp@4037 | 793 | Klass* check = find_class(d_index, d_hash, name, loader_data); |
duke@435 | 794 | if (check != NULL) { |
duke@435 | 795 | // Klass is already loaded, so just use it |
duke@435 | 796 | k = instanceKlassHandle(THREAD, check); |
duke@435 | 797 | CLEAR_PENDING_EXCEPTION; |
duke@435 | 798 | guarantee((!class_loader.is_null()), "dup definition for bootstrap loader?"); |
duke@435 | 799 | } |
duke@435 | 800 | } |
duke@435 | 801 | } |
duke@435 | 802 | |
duke@435 | 803 | // If everything was OK (no exceptions, no null return value), and |
duke@435 | 804 | // class_loader is NOT the defining loader, do a little more bookkeeping. |
duke@435 | 805 | if (!HAS_PENDING_EXCEPTION && !k.is_null() && |
duke@435 | 806 | k->class_loader() != class_loader()) { |
duke@435 | 807 | |
duke@435 | 808 | check_constraints(d_index, d_hash, k, class_loader, false, THREAD); |
duke@435 | 809 | |
duke@435 | 810 | // Need to check for a PENDING_EXCEPTION again; check_constraints |
duke@435 | 811 | // can throw and doesn't use the CHECK macro. |
duke@435 | 812 | if (!HAS_PENDING_EXCEPTION) { |
duke@435 | 813 | { // Grabbing the Compile_lock prevents systemDictionary updates |
duke@435 | 814 | // during compilations. |
duke@435 | 815 | MutexLocker mu(Compile_lock, THREAD); |
duke@435 | 816 | update_dictionary(d_index, d_hash, p_index, p_hash, |
sla@5237 | 817 | k, class_loader, THREAD); |
duke@435 | 818 | } |
sla@5237 | 819 | |
duke@435 | 820 | if (JvmtiExport::should_post_class_load()) { |
duke@435 | 821 | Thread *thread = THREAD; |
duke@435 | 822 | assert(thread->is_Java_thread(), "thread->is_Java_thread()"); |
duke@435 | 823 | JvmtiExport::post_class_load((JavaThread *) thread, k()); |
duke@435 | 824 | } |
duke@435 | 825 | } |
duke@435 | 826 | } |
acorn@4425 | 827 | } // load_instance_class loop |
acorn@4425 | 828 | |
coleenp@4751 | 829 | if (HAS_PENDING_EXCEPTION) { |
coleenp@4751 | 830 | // An exception, such as OOM could have happened at various places inside |
coleenp@4751 | 831 | // load_instance_class. We might have partially initialized a shared class |
coleenp@4751 | 832 | // and need to clean it up. |
coleenp@4751 | 833 | if (class_loader.is_null()) { |
coleenp@4751 | 834 | // In some cases k may be null. Let's find the shared class again. |
coleenp@4751 | 835 | instanceKlassHandle ik(THREAD, find_shared_class(name)); |
coleenp@4751 | 836 | if (ik.not_null()) { |
coleenp@4751 | 837 | if (ik->class_loader_data() == NULL) { |
coleenp@4751 | 838 | // We didn't go as far as Klass::restore_unshareable_info(), |
coleenp@4751 | 839 | // so nothing to clean up. |
coleenp@4751 | 840 | } else { |
coleenp@4848 | 841 | Klass *kk; |
coleenp@4848 | 842 | { |
coleenp@4848 | 843 | MutexLocker mu(SystemDictionary_lock, THREAD); |
hseigel@5052 | 844 | kk = find_class(d_index, d_hash, name, ik->class_loader_data()); |
coleenp@4848 | 845 | } |
coleenp@4751 | 846 | if (kk != NULL) { |
coleenp@4751 | 847 | // No clean up is needed if the shared class has been entered |
coleenp@4751 | 848 | // into system dictionary, as load_shared_class() won't be called |
coleenp@4751 | 849 | // again. |
coleenp@4751 | 850 | } else { |
coleenp@4848 | 851 | // This must be done outside of the SystemDictionary_lock to |
coleenp@4848 | 852 | // avoid deadlock. |
coleenp@4848 | 853 | // |
coleenp@4848 | 854 | // Note that Klass::restore_unshareable_info (called via |
coleenp@4848 | 855 | // load_instance_class above) is also called outside |
coleenp@4848 | 856 | // of SystemDictionary_lock. Other threads are blocked from |
coleenp@4848 | 857 | // loading this class because they are waiting on the |
coleenp@4848 | 858 | // SystemDictionary_lock until this thread removes |
coleenp@4848 | 859 | // the placeholder below. |
coleenp@4848 | 860 | // |
coleenp@4848 | 861 | // This need to be re-thought when parallel-capable non-boot |
coleenp@4848 | 862 | // classloaders are supported by CDS (today they're not). |
coleenp@4751 | 863 | clean_up_shared_class(ik, class_loader, THREAD); |
coleenp@4751 | 864 | } |
coleenp@4751 | 865 | } |
coleenp@4751 | 866 | } |
coleenp@4751 | 867 | } |
coleenp@4751 | 868 | } |
coleenp@4751 | 869 | |
acorn@4425 | 870 | if (load_instance_added == true) { |
acorn@4425 | 871 | // clean up placeholder entries for LOAD_INSTANCE success or error |
acorn@4425 | 872 | // This brackets the SystemDictionary updates for both defining |
acorn@4425 | 873 | // and initiating loaders |
acorn@4425 | 874 | MutexLocker mu(SystemDictionary_lock, THREAD); |
sla@5237 | 875 | placeholders()->find_and_remove(p_index, p_hash, name, loader_data, PlaceholderTable::LOAD_INSTANCE, THREAD); |
sla@5237 | 876 | SystemDictionary_lock->notify_all(); |
duke@435 | 877 | } |
duke@435 | 878 | } |
duke@435 | 879 | |
acorn@4425 | 880 | if (HAS_PENDING_EXCEPTION || k.is_null()) { |
acorn@4425 | 881 | return NULL; |
acorn@4425 | 882 | } |
acorn@4425 | 883 | |
sla@5237 | 884 | post_class_load_event(class_load_start_time, k, class_loader); |
sla@5237 | 885 | |
duke@435 | 886 | #ifdef ASSERT |
duke@435 | 887 | { |
coleenp@4037 | 888 | ClassLoaderData* loader_data = k->class_loader_data(); |
duke@435 | 889 | MutexLocker mu(SystemDictionary_lock, THREAD); |
coleenp@4037 | 890 | Klass* kk = find_class(name, loader_data); |
duke@435 | 891 | assert(kk == k(), "should be present in dictionary"); |
duke@435 | 892 | } |
duke@435 | 893 | #endif |
duke@435 | 894 | |
duke@435 | 895 | // return if the protection domain in NULL |
duke@435 | 896 | if (protection_domain() == NULL) return k(); |
duke@435 | 897 | |
duke@435 | 898 | // Check the protection domain has the right access |
duke@435 | 899 | { |
duke@435 | 900 | MutexLocker mu(SystemDictionary_lock, THREAD); |
duke@435 | 901 | // Note that we have an entry, and entries can be deleted only during GC, |
duke@435 | 902 | // so we cannot allow GC to occur while we're holding this entry. |
duke@435 | 903 | // We're using a No_Safepoint_Verifier to catch any place where we |
duke@435 | 904 | // might potentially do a GC at all. |
acorn@4425 | 905 | // Dictionary::do_unloading() asserts that classes in SD are only |
acorn@4425 | 906 | // unloaded at a safepoint. Anonymous classes are not in SD. |
duke@435 | 907 | No_Safepoint_Verifier nosafepoint; |
duke@435 | 908 | if (dictionary()->is_valid_protection_domain(d_index, d_hash, name, |
coleenp@4037 | 909 | loader_data, |
duke@435 | 910 | protection_domain)) { |
duke@435 | 911 | return k(); |
duke@435 | 912 | } |
duke@435 | 913 | } |
duke@435 | 914 | |
duke@435 | 915 | // Verify protection domain. If it fails an exception is thrown |
coleenp@4037 | 916 | validate_protection_domain(k, class_loader, protection_domain, CHECK_NULL); |
duke@435 | 917 | |
duke@435 | 918 | return k(); |
duke@435 | 919 | } |
duke@435 | 920 | |
duke@435 | 921 | |
duke@435 | 922 | // This routine does not lock the system dictionary. |
duke@435 | 923 | // |
duke@435 | 924 | // Since readers don't hold a lock, we must make sure that system |
duke@435 | 925 | // dictionary entries are only removed at a safepoint (when only one |
duke@435 | 926 | // thread is running), and are added to in a safe way (all links must |
duke@435 | 927 | // be updated in an MT-safe manner). |
duke@435 | 928 | // |
duke@435 | 929 | // Callers should be aware that an entry could be added just after |
duke@435 | 930 | // _dictionary->bucket(index) is read here, so the caller will not see |
duke@435 | 931 | // the new entry. |
duke@435 | 932 | |
coleenp@4037 | 933 | Klass* SystemDictionary::find(Symbol* class_name, |
stefank@4667 | 934 | Handle class_loader, |
stefank@4667 | 935 | Handle protection_domain, |
stefank@4667 | 936 | TRAPS) { |
duke@435 | 937 | |
kvn@991 | 938 | // UseNewReflection |
kvn@991 | 939 | // The result of this call should be consistent with the result |
kvn@991 | 940 | // of the call to resolve_instance_class_or_null(). |
kvn@991 | 941 | // See evaluation 6790209 and 4474172 for more details. |
kvn@991 | 942 | class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); |
stefank@4667 | 943 | ClassLoaderData* loader_data = ClassLoaderData::class_loader_data_or_null(class_loader()); |
stefank@4667 | 944 | |
stefank@4667 | 945 | if (loader_data == NULL) { |
stefank@4667 | 946 | // If the ClassLoaderData has not been setup, |
stefank@4667 | 947 | // then the class loader has no entries in the dictionary. |
stefank@4667 | 948 | return NULL; |
stefank@4667 | 949 | } |
coleenp@4037 | 950 | |
coleenp@4037 | 951 | unsigned int d_hash = dictionary()->compute_hash(class_name, loader_data); |
duke@435 | 952 | int d_index = dictionary()->hash_to_index(d_hash); |
duke@435 | 953 | |
duke@435 | 954 | { |
duke@435 | 955 | // Note that we have an entry, and entries can be deleted only during GC, |
duke@435 | 956 | // so we cannot allow GC to occur while we're holding this entry. |
duke@435 | 957 | // We're using a No_Safepoint_Verifier to catch any place where we |
duke@435 | 958 | // might potentially do a GC at all. |
acorn@4425 | 959 | // Dictionary::do_unloading() asserts that classes in SD are only |
acorn@4425 | 960 | // unloaded at a safepoint. Anonymous classes are not in SD. |
duke@435 | 961 | No_Safepoint_Verifier nosafepoint; |
coleenp@4037 | 962 | return dictionary()->find(d_index, d_hash, class_name, loader_data, |
duke@435 | 963 | protection_domain, THREAD); |
duke@435 | 964 | } |
duke@435 | 965 | } |
duke@435 | 966 | |
duke@435 | 967 | |
duke@435 | 968 | // Look for a loaded instance or array klass by name. Do not do any loading. |
duke@435 | 969 | // return NULL in case of error. |
coleenp@4037 | 970 | Klass* SystemDictionary::find_instance_or_array_klass(Symbol* class_name, |
coleenp@4142 | 971 | Handle class_loader, |
coleenp@4142 | 972 | Handle protection_domain, |
coleenp@4142 | 973 | TRAPS) { |
coleenp@4037 | 974 | Klass* k = NULL; |
coleenp@2497 | 975 | assert(class_name != NULL, "class name must be non NULL"); |
jrose@567 | 976 | |
coleenp@2497 | 977 | if (FieldType::is_array(class_name)) { |
duke@435 | 978 | // The name refers to an array. Parse the name. |
coleenp@2497 | 979 | // dimension and object_key in FieldArrayInfo are assigned as a |
coleenp@2497 | 980 | // side-effect of this call |
coleenp@2497 | 981 | FieldArrayInfo fd; |
coleenp@2497 | 982 | BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
duke@435 | 983 | if (t != T_OBJECT) { |
duke@435 | 984 | k = Universe::typeArrayKlassObj(t); |
duke@435 | 985 | } else { |
coleenp@2497 | 986 | k = SystemDictionary::find(fd.object_key(), class_loader, protection_domain, THREAD); |
duke@435 | 987 | } |
duke@435 | 988 | if (k != NULL) { |
hseigel@4278 | 989 | k = k->array_klass_or_null(fd.dimension()); |
duke@435 | 990 | } |
duke@435 | 991 | } else { |
duke@435 | 992 | k = find(class_name, class_loader, protection_domain, THREAD); |
duke@435 | 993 | } |
duke@435 | 994 | return k; |
duke@435 | 995 | } |
duke@435 | 996 | |
duke@435 | 997 | // Note: this method is much like resolve_from_stream, but |
duke@435 | 998 | // updates no supplemental data structures. |
duke@435 | 999 | // TODO consolidate the two methods with a helper routine? |
coleenp@4037 | 1000 | Klass* SystemDictionary::parse_stream(Symbol* class_name, |
coleenp@4142 | 1001 | Handle class_loader, |
coleenp@4142 | 1002 | Handle protection_domain, |
coleenp@4142 | 1003 | ClassFileStream* st, |
coleenp@4142 | 1004 | KlassHandle host_klass, |
coleenp@4142 | 1005 | GrowableArray<Handle>* cp_patches, |
coleenp@4142 | 1006 | TRAPS) { |
coleenp@2497 | 1007 | TempNewSymbol parsed_name = NULL; |
duke@435 | 1008 | |
sla@5237 | 1009 | TracingTime class_load_start_time = Tracing::time(); |
sla@5237 | 1010 | |
coleenp@4304 | 1011 | ClassLoaderData* loader_data; |
coleenp@4304 | 1012 | if (host_klass.not_null()) { |
coleenp@4304 | 1013 | // Create a new CLD for anonymous class, that uses the same class loader |
coleenp@4304 | 1014 | // as the host_klass |
coleenp@4304 | 1015 | assert(EnableInvokeDynamic, ""); |
coleenp@4304 | 1016 | guarantee(host_klass->class_loader() == class_loader(), "should be the same"); |
coleenp@4304 | 1017 | loader_data = ClassLoaderData::anonymous_class_loader_data(class_loader(), CHECK_NULL); |
coleenp@4304 | 1018 | loader_data->record_dependency(host_klass(), CHECK_NULL); |
coleenp@4304 | 1019 | } else { |
coleenp@4304 | 1020 | loader_data = ClassLoaderData::class_loader_data(class_loader()); |
coleenp@4304 | 1021 | } |
coleenp@4304 | 1022 | |
duke@435 | 1023 | // Parse the stream. Note that we do this even though this klass might |
duke@435 | 1024 | // already be present in the SystemDictionary, otherwise we would not |
duke@435 | 1025 | // throw potential ClassFormatErrors. |
duke@435 | 1026 | // |
duke@435 | 1027 | // Note: "name" is updated. |
duke@435 | 1028 | |
duke@435 | 1029 | instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, |
coleenp@4304 | 1030 | loader_data, |
duke@435 | 1031 | protection_domain, |
jrose@1145 | 1032 | host_klass, |
jrose@1145 | 1033 | cp_patches, |
duke@435 | 1034 | parsed_name, |
acorn@1408 | 1035 | true, |
duke@435 | 1036 | THREAD); |
duke@435 | 1037 | |
duke@435 | 1038 | |
jrose@866 | 1039 | if (host_klass.not_null() && k.not_null()) { |
twisti@2698 | 1040 | assert(EnableInvokeDynamic, ""); |
coleenp@4304 | 1041 | k->set_host_klass(host_klass()); |
jrose@866 | 1042 | // If it's anonymous, initialize it now, since nobody else will. |
jrose@866 | 1043 | |
jrose@866 | 1044 | { |
jrose@866 | 1045 | MutexLocker mu_r(Compile_lock, THREAD); |
jrose@866 | 1046 | |
jrose@866 | 1047 | // Add to class hierarchy, initialize vtables, and do possible |
jrose@866 | 1048 | // deoptimizations. |
jrose@866 | 1049 | add_to_hierarchy(k, CHECK_NULL); // No exception, but can block |
jrose@866 | 1050 | |
jrose@866 | 1051 | // But, do not add to system dictionary. |
jrose@866 | 1052 | } |
jrose@866 | 1053 | |
coleenp@4037 | 1054 | // Rewrite and patch constant pool here. |
coleenp@4304 | 1055 | k->link_class(CHECK_NULL); |
coleenp@4037 | 1056 | if (cp_patches != NULL) { |
coleenp@4037 | 1057 | k->constants()->patch_resolved_references(cp_patches); |
coleenp@4037 | 1058 | } |
coleenp@4304 | 1059 | k->eager_initialize(CHECK_NULL); |
jrose@866 | 1060 | |
jrose@866 | 1061 | // notify jvmti |
jrose@866 | 1062 | if (JvmtiExport::should_post_class_load()) { |
jrose@866 | 1063 | assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); |
jrose@866 | 1064 | JvmtiExport::post_class_load((JavaThread *) THREAD, k()); |
jrose@866 | 1065 | } |
sla@5237 | 1066 | |
sla@5237 | 1067 | post_class_load_event(class_load_start_time, k, class_loader); |
jrose@866 | 1068 | } |
coleenp@4037 | 1069 | assert(host_klass.not_null() || cp_patches == NULL, |
coleenp@4037 | 1070 | "cp_patches only found with host_klass"); |
jrose@866 | 1071 | |
duke@435 | 1072 | return k(); |
duke@435 | 1073 | } |
duke@435 | 1074 | |
duke@435 | 1075 | // Add a klass to the system from a stream (called by jni_DefineClass and |
duke@435 | 1076 | // JVM_DefineClass). |
duke@435 | 1077 | // Note: class_name can be NULL. In that case we do not know the name of |
duke@435 | 1078 | // the class until we have parsed the stream. |
duke@435 | 1079 | |
coleenp@4037 | 1080 | Klass* SystemDictionary::resolve_from_stream(Symbol* class_name, |
coleenp@4142 | 1081 | Handle class_loader, |
coleenp@4142 | 1082 | Handle protection_domain, |
coleenp@4142 | 1083 | ClassFileStream* st, |
coleenp@4142 | 1084 | bool verify, |
coleenp@4142 | 1085 | TRAPS) { |
duke@435 | 1086 | |
acorn@949 | 1087 | // Classloaders that support parallelism, e.g. bootstrap classloader, |
acorn@949 | 1088 | // or all classloaders with UnsyncloadClass do not acquire lock here |
acorn@949 | 1089 | bool DoObjectLock = true; |
acorn@949 | 1090 | if (is_parallelCapable(class_loader)) { |
acorn@949 | 1091 | DoObjectLock = false; |
acorn@949 | 1092 | } |
acorn@949 | 1093 | |
coleenp@4304 | 1094 | ClassLoaderData* loader_data = register_loader(class_loader, CHECK_NULL); |
coleenp@4037 | 1095 | |
acorn@949 | 1096 | // Make sure we are synchronized on the class loader before we proceed |
duke@435 | 1097 | Handle lockObject = compute_loader_lock_object(class_loader, THREAD); |
duke@435 | 1098 | check_loader_lock_contention(lockObject, THREAD); |
acorn@949 | 1099 | ObjectLocker ol(lockObject, THREAD, DoObjectLock); |
duke@435 | 1100 | |
coleenp@2497 | 1101 | TempNewSymbol parsed_name = NULL; |
duke@435 | 1102 | |
duke@435 | 1103 | // Parse the stream. Note that we do this even though this klass might |
duke@435 | 1104 | // already be present in the SystemDictionary, otherwise we would not |
duke@435 | 1105 | // throw potential ClassFormatErrors. |
duke@435 | 1106 | // |
duke@435 | 1107 | // Note: "name" is updated. |
duke@435 | 1108 | |
duke@435 | 1109 | instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, |
coleenp@4304 | 1110 | loader_data, |
duke@435 | 1111 | protection_domain, |
duke@435 | 1112 | parsed_name, |
acorn@1408 | 1113 | verify, |
duke@435 | 1114 | THREAD); |
duke@435 | 1115 | |
duke@435 | 1116 | const char* pkg = "java/"; |
duke@435 | 1117 | if (!HAS_PENDING_EXCEPTION && |
duke@435 | 1118 | !class_loader.is_null() && |
coleenp@2497 | 1119 | parsed_name != NULL && |
duke@435 | 1120 | !strncmp((const char*)parsed_name->bytes(), pkg, strlen(pkg))) { |
duke@435 | 1121 | // It is illegal to define classes in the "java." package from |
duke@435 | 1122 | // JVM_DefineClass or jni_DefineClass unless you're the bootclassloader |
duke@435 | 1123 | ResourceMark rm(THREAD); |
duke@435 | 1124 | char* name = parsed_name->as_C_string(); |
duke@435 | 1125 | char* index = strrchr(name, '/'); |
duke@435 | 1126 | *index = '\0'; // chop to just the package name |
duke@435 | 1127 | while ((index = strchr(name, '/')) != NULL) { |
duke@435 | 1128 | *index = '.'; // replace '/' with '.' in package name |
duke@435 | 1129 | } |
duke@435 | 1130 | const char* fmt = "Prohibited package name: %s"; |
duke@435 | 1131 | size_t len = strlen(fmt) + strlen(name); |
duke@435 | 1132 | char* message = NEW_RESOURCE_ARRAY(char, len); |
duke@435 | 1133 | jio_snprintf(message, len, fmt, name); |
duke@435 | 1134 | Exceptions::_throw_msg(THREAD_AND_LOCATION, |
duke@435 | 1135 | vmSymbols::java_lang_SecurityException(), message); |
duke@435 | 1136 | } |
duke@435 | 1137 | |
duke@435 | 1138 | if (!HAS_PENDING_EXCEPTION) { |
coleenp@2497 | 1139 | assert(parsed_name != NULL, "Sanity"); |
coleenp@2497 | 1140 | assert(class_name == NULL || class_name == parsed_name, "name mismatch"); |
duke@435 | 1141 | // Verification prevents us from creating names with dots in them, this |
duke@435 | 1142 | // asserts that that's the case. |
duke@435 | 1143 | assert(is_internal_format(parsed_name), |
duke@435 | 1144 | "external class name format used internally"); |
duke@435 | 1145 | |
duke@435 | 1146 | // Add class just loaded |
acorn@949 | 1147 | // If a class loader supports parallel classloading handle parallel define requests |
coleenp@4037 | 1148 | // find_or_define_instance_class may return a different InstanceKlass |
acorn@949 | 1149 | if (is_parallelCapable(class_loader)) { |
acorn@949 | 1150 | k = find_or_define_instance_class(class_name, class_loader, k, THREAD); |
acorn@949 | 1151 | } else { |
acorn@949 | 1152 | define_instance_class(k, THREAD); |
acorn@949 | 1153 | } |
duke@435 | 1154 | } |
duke@435 | 1155 | |
acorn@4425 | 1156 | // Make sure we have an entry in the SystemDictionary on success |
duke@435 | 1157 | debug_only( { |
duke@435 | 1158 | if (!HAS_PENDING_EXCEPTION) { |
coleenp@2497 | 1159 | assert(parsed_name != NULL, "parsed_name is still null?"); |
coleenp@2497 | 1160 | Symbol* h_name = k->name(); |
coleenp@4037 | 1161 | ClassLoaderData *defining_loader_data = k->class_loader_data(); |
duke@435 | 1162 | |
duke@435 | 1163 | MutexLocker mu(SystemDictionary_lock, THREAD); |
duke@435 | 1164 | |
coleenp@4037 | 1165 | Klass* check = find_class(parsed_name, loader_data); |
duke@435 | 1166 | assert(check == k(), "should be present in the dictionary"); |
duke@435 | 1167 | |
coleenp@4037 | 1168 | Klass* check2 = find_class(h_name, defining_loader_data); |
duke@435 | 1169 | assert(check == check2, "name inconsistancy in SystemDictionary"); |
duke@435 | 1170 | } |
duke@435 | 1171 | } ); |
duke@435 | 1172 | |
duke@435 | 1173 | return k(); |
duke@435 | 1174 | } |
duke@435 | 1175 | |
duke@435 | 1176 | |
zgu@3900 | 1177 | void SystemDictionary::set_shared_dictionary(HashtableBucket<mtClass>* t, int length, |
duke@435 | 1178 | int number_of_entries) { |
zgu@3900 | 1179 | assert(length == _nof_buckets * sizeof(HashtableBucket<mtClass>), |
duke@435 | 1180 | "bad shared dictionary size."); |
duke@435 | 1181 | _shared_dictionary = new Dictionary(_nof_buckets, t, number_of_entries); |
duke@435 | 1182 | } |
duke@435 | 1183 | |
duke@435 | 1184 | |
duke@435 | 1185 | // If there is a shared dictionary, then find the entry for the |
duke@435 | 1186 | // given shared system class, if any. |
duke@435 | 1187 | |
coleenp@4037 | 1188 | Klass* SystemDictionary::find_shared_class(Symbol* class_name) { |
duke@435 | 1189 | if (shared_dictionary() != NULL) { |
coleenp@4037 | 1190 | unsigned int d_hash = shared_dictionary()->compute_hash(class_name, NULL); |
acorn@3491 | 1191 | int d_index = shared_dictionary()->hash_to_index(d_hash); |
coleenp@4037 | 1192 | |
duke@435 | 1193 | return shared_dictionary()->find_shared_class(d_index, d_hash, class_name); |
duke@435 | 1194 | } else { |
duke@435 | 1195 | return NULL; |
duke@435 | 1196 | } |
duke@435 | 1197 | } |
duke@435 | 1198 | |
duke@435 | 1199 | |
duke@435 | 1200 | // Load a class from the shared spaces (found through the shared system |
duke@435 | 1201 | // dictionary). Force the superclass and all interfaces to be loaded. |
duke@435 | 1202 | // Update the class definition to include sibling classes and no |
duke@435 | 1203 | // subclasses (yet). [Classes in the shared space are not part of the |
duke@435 | 1204 | // object hierarchy until loaded.] |
duke@435 | 1205 | |
duke@435 | 1206 | instanceKlassHandle SystemDictionary::load_shared_class( |
coleenp@2497 | 1207 | Symbol* class_name, Handle class_loader, TRAPS) { |
duke@435 | 1208 | instanceKlassHandle ik (THREAD, find_shared_class(class_name)); |
duke@435 | 1209 | return load_shared_class(ik, class_loader, THREAD); |
duke@435 | 1210 | } |
duke@435 | 1211 | |
duke@435 | 1212 | instanceKlassHandle SystemDictionary::load_shared_class( |
duke@435 | 1213 | instanceKlassHandle ik, Handle class_loader, TRAPS) { |
duke@435 | 1214 | assert(class_loader.is_null(), "non-null classloader for shared class?"); |
duke@435 | 1215 | if (ik.not_null()) { |
duke@435 | 1216 | instanceKlassHandle nh = instanceKlassHandle(); // null Handle |
coleenp@2497 | 1217 | Symbol* class_name = ik->name(); |
duke@435 | 1218 | |
duke@435 | 1219 | // Found the class, now load the superclass and interfaces. If they |
duke@435 | 1220 | // are shared, add them to the main system dictionary and reset |
duke@435 | 1221 | // their hierarchy references (supers, subs, and interfaces). |
duke@435 | 1222 | |
duke@435 | 1223 | if (ik->super() != NULL) { |
coleenp@4037 | 1224 | Symbol* cn = ik->super()->name(); |
duke@435 | 1225 | resolve_super_or_fail(class_name, cn, |
duke@435 | 1226 | class_loader, Handle(), true, CHECK_(nh)); |
duke@435 | 1227 | } |
duke@435 | 1228 | |
coleenp@4037 | 1229 | Array<Klass*>* interfaces = ik->local_interfaces(); |
duke@435 | 1230 | int num_interfaces = interfaces->length(); |
duke@435 | 1231 | for (int index = 0; index < num_interfaces; index++) { |
coleenp@4037 | 1232 | Klass* k = interfaces->at(index); |
coleenp@4037 | 1233 | |
coleenp@4037 | 1234 | // Note: can not use InstanceKlass::cast here because |
coleenp@4037 | 1235 | // interfaces' InstanceKlass's C++ vtbls haven't been |
duke@435 | 1236 | // reinitialized yet (they will be once the interface classes |
duke@435 | 1237 | // are loaded) |
coleenp@4037 | 1238 | Symbol* name = k->name(); |
duke@435 | 1239 | resolve_super_or_fail(class_name, name, class_loader, Handle(), false, CHECK_(nh)); |
duke@435 | 1240 | } |
duke@435 | 1241 | |
duke@435 | 1242 | // Adjust methods to recover missing data. They need addresses for |
duke@435 | 1243 | // interpreter entry points and their default native method address |
duke@435 | 1244 | // must be reset. |
duke@435 | 1245 | |
duke@435 | 1246 | // Updating methods must be done under a lock so multiple |
duke@435 | 1247 | // threads don't update these in parallel |
duke@435 | 1248 | // Shared classes are all currently loaded by the bootstrap |
duke@435 | 1249 | // classloader, so this will never cause a deadlock on |
duke@435 | 1250 | // a custom class loader lock. |
duke@435 | 1251 | |
duke@435 | 1252 | { |
duke@435 | 1253 | Handle lockObject = compute_loader_lock_object(class_loader, THREAD); |
duke@435 | 1254 | check_loader_lock_contention(lockObject, THREAD); |
duke@435 | 1255 | ObjectLocker ol(lockObject, THREAD, true); |
coleenp@4037 | 1256 | ik->restore_unshareable_info(CHECK_(nh)); |
duke@435 | 1257 | } |
duke@435 | 1258 | |
duke@435 | 1259 | if (TraceClassLoading) { |
duke@435 | 1260 | ResourceMark rm; |
duke@435 | 1261 | tty->print("[Loaded %s", ik->external_name()); |
duke@435 | 1262 | tty->print(" from shared objects file"); |
duke@435 | 1263 | tty->print_cr("]"); |
duke@435 | 1264 | } |
duke@435 | 1265 | // notify a class loaded from shared object |
coleenp@4037 | 1266 | ClassLoadingService::notify_class_loaded(InstanceKlass::cast(ik()), |
duke@435 | 1267 | true /* shared class */); |
duke@435 | 1268 | } |
duke@435 | 1269 | return ik; |
duke@435 | 1270 | } |
duke@435 | 1271 | |
coleenp@4751 | 1272 | void SystemDictionary::clean_up_shared_class(instanceKlassHandle ik, Handle class_loader, TRAPS) { |
coleenp@4751 | 1273 | // Updating methods must be done under a lock so multiple |
coleenp@4751 | 1274 | // threads don't update these in parallel |
coleenp@4751 | 1275 | // Shared classes are all currently loaded by the bootstrap |
coleenp@4751 | 1276 | // classloader, so this will never cause a deadlock on |
coleenp@4751 | 1277 | // a custom class loader lock. |
coleenp@4751 | 1278 | { |
coleenp@4751 | 1279 | Handle lockObject = compute_loader_lock_object(class_loader, THREAD); |
coleenp@4751 | 1280 | check_loader_lock_contention(lockObject, THREAD); |
coleenp@4751 | 1281 | ObjectLocker ol(lockObject, THREAD, true); |
coleenp@4751 | 1282 | ik->remove_unshareable_info(); |
coleenp@4751 | 1283 | } |
coleenp@4751 | 1284 | } |
duke@435 | 1285 | |
coleenp@2497 | 1286 | instanceKlassHandle SystemDictionary::load_instance_class(Symbol* class_name, Handle class_loader, TRAPS) { |
duke@435 | 1287 | instanceKlassHandle nh = instanceKlassHandle(); // null Handle |
duke@435 | 1288 | if (class_loader.is_null()) { |
mchung@1310 | 1289 | |
duke@435 | 1290 | // Search the shared system dictionary for classes preloaded into the |
duke@435 | 1291 | // shared spaces. |
duke@435 | 1292 | instanceKlassHandle k; |
mchung@1310 | 1293 | { |
mchung@1310 | 1294 | PerfTraceTime vmtimer(ClassLoader::perf_shared_classload_time()); |
mchung@1310 | 1295 | k = load_shared_class(class_name, class_loader, THREAD); |
mchung@1310 | 1296 | } |
duke@435 | 1297 | |
duke@435 | 1298 | if (k.is_null()) { |
duke@435 | 1299 | // Use VM class loader |
mchung@1310 | 1300 | PerfTraceTime vmtimer(ClassLoader::perf_sys_classload_time()); |
duke@435 | 1301 | k = ClassLoader::load_classfile(class_name, CHECK_(nh)); |
duke@435 | 1302 | } |
duke@435 | 1303 | |
coleenp@4037 | 1304 | // find_or_define_instance_class may return a different InstanceKlass |
duke@435 | 1305 | if (!k.is_null()) { |
duke@435 | 1306 | k = find_or_define_instance_class(class_name, class_loader, k, CHECK_(nh)); |
duke@435 | 1307 | } |
duke@435 | 1308 | return k; |
duke@435 | 1309 | } else { |
duke@435 | 1310 | // Use user specified class loader to load class. Call loadClass operation on class_loader. |
duke@435 | 1311 | ResourceMark rm(THREAD); |
duke@435 | 1312 | |
mchung@1310 | 1313 | assert(THREAD->is_Java_thread(), "must be a JavaThread"); |
mchung@1310 | 1314 | JavaThread* jt = (JavaThread*) THREAD; |
mchung@1310 | 1315 | |
mchung@1310 | 1316 | PerfClassTraceTime vmtimer(ClassLoader::perf_app_classload_time(), |
mchung@1310 | 1317 | ClassLoader::perf_app_classload_selftime(), |
mchung@1310 | 1318 | ClassLoader::perf_app_classload_count(), |
mchung@1310 | 1319 | jt->get_thread_stat()->perf_recursion_counts_addr(), |
mchung@1310 | 1320 | jt->get_thread_stat()->perf_timers_addr(), |
mchung@1310 | 1321 | PerfClassTraceTime::CLASS_LOAD); |
mchung@1310 | 1322 | |
duke@435 | 1323 | Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nh)); |
duke@435 | 1324 | // Translate to external class name format, i.e., convert '/' chars to '.' |
duke@435 | 1325 | Handle string = java_lang_String::externalize_classname(s, CHECK_(nh)); |
duke@435 | 1326 | |
duke@435 | 1327 | JavaValue result(T_OBJECT); |
duke@435 | 1328 | |
never@1577 | 1329 | KlassHandle spec_klass (THREAD, SystemDictionary::ClassLoader_klass()); |
duke@435 | 1330 | |
acorn@949 | 1331 | // Call public unsynchronized loadClass(String) directly for all class loaders |
acorn@949 | 1332 | // for parallelCapable class loaders. JDK >=7, loadClass(String, boolean) will |
acorn@949 | 1333 | // acquire a class-name based lock rather than the class loader object lock. |
acorn@949 | 1334 | // JDK < 7 already acquire the class loader lock in loadClass(String, boolean), |
acorn@949 | 1335 | // so the call to loadClassInternal() was not required. |
acorn@949 | 1336 | // |
acorn@949 | 1337 | // UnsyncloadClass flag means both call loadClass(String) and do |
acorn@949 | 1338 | // not acquire the class loader lock even for class loaders that are |
acorn@949 | 1339 | // not parallelCapable. This was a risky transitional |
acorn@949 | 1340 | // flag for diagnostic purposes only. It is risky to call |
duke@435 | 1341 | // custom class loaders without synchronization. |
duke@435 | 1342 | // WARNING If a custom class loader does NOT synchronizer findClass, or callers of |
acorn@949 | 1343 | // findClass, the UnsyncloadClass flag risks unexpected timing bugs in the field. |
duke@435 | 1344 | // Do NOT assume this will be supported in future releases. |
acorn@949 | 1345 | // |
acorn@949 | 1346 | // Added MustCallLoadClassInternal in case we discover in the field |
acorn@949 | 1347 | // a customer that counts on this call |
acorn@949 | 1348 | if (MustCallLoadClassInternal && has_loadClassInternal()) { |
duke@435 | 1349 | JavaCalls::call_special(&result, |
duke@435 | 1350 | class_loader, |
duke@435 | 1351 | spec_klass, |
coleenp@2497 | 1352 | vmSymbols::loadClassInternal_name(), |
coleenp@2497 | 1353 | vmSymbols::string_class_signature(), |
duke@435 | 1354 | string, |
duke@435 | 1355 | CHECK_(nh)); |
duke@435 | 1356 | } else { |
duke@435 | 1357 | JavaCalls::call_virtual(&result, |
duke@435 | 1358 | class_loader, |
duke@435 | 1359 | spec_klass, |
coleenp@2497 | 1360 | vmSymbols::loadClass_name(), |
coleenp@2497 | 1361 | vmSymbols::string_class_signature(), |
duke@435 | 1362 | string, |
duke@435 | 1363 | CHECK_(nh)); |
duke@435 | 1364 | } |
duke@435 | 1365 | |
duke@435 | 1366 | assert(result.get_type() == T_OBJECT, "just checking"); |
duke@435 | 1367 | oop obj = (oop) result.get_jobject(); |
duke@435 | 1368 | |
duke@435 | 1369 | // Primitive classes return null since forName() can not be |
duke@435 | 1370 | // used to obtain any of the Class objects representing primitives or void |
duke@435 | 1371 | if ((obj != NULL) && !(java_lang_Class::is_primitive(obj))) { |
duke@435 | 1372 | instanceKlassHandle k = |
coleenp@4037 | 1373 | instanceKlassHandle(THREAD, java_lang_Class::as_Klass(obj)); |
duke@435 | 1374 | // For user defined Java class loaders, check that the name returned is |
duke@435 | 1375 | // the same as that requested. This check is done for the bootstrap |
duke@435 | 1376 | // loader when parsing the class file. |
coleenp@2497 | 1377 | if (class_name == k->name()) { |
duke@435 | 1378 | return k; |
duke@435 | 1379 | } |
duke@435 | 1380 | } |
duke@435 | 1381 | // Class is not found or has the wrong name, return NULL |
duke@435 | 1382 | return nh; |
duke@435 | 1383 | } |
duke@435 | 1384 | } |
duke@435 | 1385 | |
duke@435 | 1386 | void SystemDictionary::define_instance_class(instanceKlassHandle k, TRAPS) { |
duke@435 | 1387 | |
coleenp@4037 | 1388 | ClassLoaderData* loader_data = k->class_loader_data(); |
coleenp@4037 | 1389 | Handle class_loader_h(THREAD, loader_data->class_loader()); |
coleenp@4037 | 1390 | |
coleenp@4037 | 1391 | for (uintx it = 0; it < GCExpandToAllocateDelayMillis; it++){} |
duke@435 | 1392 | |
acorn@949 | 1393 | // for bootstrap and other parallel classloaders don't acquire lock, |
acorn@949 | 1394 | // use placeholder token |
acorn@949 | 1395 | // If a parallelCapable class loader calls define_instance_class instead of |
acorn@949 | 1396 | // find_or_define_instance_class to get here, we have a timing |
acorn@949 | 1397 | // hole with systemDictionary updates and check_constraints |
acorn@949 | 1398 | if (!class_loader_h.is_null() && !is_parallelCapable(class_loader_h)) { |
duke@435 | 1399 | assert(ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, |
duke@435 | 1400 | compute_loader_lock_object(class_loader_h, THREAD)), |
duke@435 | 1401 | "define called without lock"); |
duke@435 | 1402 | } |
duke@435 | 1403 | |
duke@435 | 1404 | // Check class-loading constraints. Throw exception if violation is detected. |
duke@435 | 1405 | // Grabs and releases SystemDictionary_lock |
duke@435 | 1406 | // The check_constraints/find_class call and update_dictionary sequence |
duke@435 | 1407 | // must be "atomic" for a specific class/classloader pair so we never |
duke@435 | 1408 | // define two different instanceKlasses for that class/classloader pair. |
duke@435 | 1409 | // Existing classloaders will call define_instance_class with the |
duke@435 | 1410 | // classloader lock held |
duke@435 | 1411 | // Parallel classloaders will call find_or_define_instance_class |
duke@435 | 1412 | // which will require a token to perform the define class |
coleenp@2497 | 1413 | Symbol* name_h = k->name(); |
coleenp@4037 | 1414 | unsigned int d_hash = dictionary()->compute_hash(name_h, loader_data); |
duke@435 | 1415 | int d_index = dictionary()->hash_to_index(d_hash); |
duke@435 | 1416 | check_constraints(d_index, d_hash, k, class_loader_h, true, CHECK); |
duke@435 | 1417 | |
coleenp@4062 | 1418 | // Register class just loaded with class loader (placed in Vector) |
coleenp@4062 | 1419 | // Note we do this before updating the dictionary, as this can |
coleenp@4062 | 1420 | // fail with an OutOfMemoryError (if it does, we will *not* put this |
coleenp@4062 | 1421 | // class in the dictionary and will not update the class hierarchy). |
coleenp@4062 | 1422 | // JVMTI FollowReferences needs to find the classes this way. |
coleenp@4062 | 1423 | if (k->class_loader() != NULL) { |
coleenp@4062 | 1424 | methodHandle m(THREAD, Universe::loader_addClass_method()); |
coleenp@4062 | 1425 | JavaValue result(T_VOID); |
coleenp@4062 | 1426 | JavaCallArguments args(class_loader_h); |
coleenp@4062 | 1427 | args.push_oop(Handle(THREAD, k->java_mirror())); |
coleenp@4062 | 1428 | JavaCalls::call(&result, m, &args, CHECK); |
coleenp@4062 | 1429 | } |
coleenp@4062 | 1430 | |
duke@435 | 1431 | // Add the new class. We need recompile lock during update of CHA. |
duke@435 | 1432 | { |
coleenp@4037 | 1433 | unsigned int p_hash = placeholders()->compute_hash(name_h, loader_data); |
duke@435 | 1434 | int p_index = placeholders()->hash_to_index(p_hash); |
duke@435 | 1435 | |
duke@435 | 1436 | MutexLocker mu_r(Compile_lock, THREAD); |
duke@435 | 1437 | |
duke@435 | 1438 | // Add to class hierarchy, initialize vtables, and do possible |
duke@435 | 1439 | // deoptimizations. |
duke@435 | 1440 | add_to_hierarchy(k, CHECK); // No exception, but can block |
duke@435 | 1441 | |
duke@435 | 1442 | // Add to systemDictionary - so other classes can see it. |
duke@435 | 1443 | // Grabs and releases SystemDictionary_lock |
duke@435 | 1444 | update_dictionary(d_index, d_hash, p_index, p_hash, |
duke@435 | 1445 | k, class_loader_h, THREAD); |
duke@435 | 1446 | } |
duke@435 | 1447 | k->eager_initialize(THREAD); |
duke@435 | 1448 | |
duke@435 | 1449 | // notify jvmti |
duke@435 | 1450 | if (JvmtiExport::should_post_class_load()) { |
duke@435 | 1451 | assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); |
duke@435 | 1452 | JvmtiExport::post_class_load((JavaThread *) THREAD, k()); |
duke@435 | 1453 | |
duke@435 | 1454 | } |
sla@5237 | 1455 | |
duke@435 | 1456 | } |
duke@435 | 1457 | |
duke@435 | 1458 | // Support parallel classloading |
acorn@1510 | 1459 | // All parallel class loaders, including bootstrap classloader |
acorn@1510 | 1460 | // lock a placeholder entry for this class/class_loader pair |
acorn@1510 | 1461 | // to allow parallel defines of different classes for this class loader |
acorn@949 | 1462 | // With AllowParallelDefine flag==true, in case they do not synchronize around |
acorn@949 | 1463 | // FindLoadedClass/DefineClass, calls, we check for parallel |
duke@435 | 1464 | // loading for them, wait if a defineClass is in progress |
duke@435 | 1465 | // and return the initial requestor's results |
acorn@1510 | 1466 | // This flag does not apply to the bootstrap classloader. |
acorn@949 | 1467 | // With AllowParallelDefine flag==false, call through to define_instance_class |
acorn@949 | 1468 | // which will throw LinkageError: duplicate class definition. |
acorn@1510 | 1469 | // False is the requested default. |
duke@435 | 1470 | // For better performance, the class loaders should synchronize |
acorn@949 | 1471 | // findClass(), i.e. FindLoadedClass/DefineClassIfAbsent or they |
duke@435 | 1472 | // potentially waste time reading and parsing the bytestream. |
duke@435 | 1473 | // Note: VM callers should ensure consistency of k/class_name,class_loader |
coleenp@2497 | 1474 | instanceKlassHandle SystemDictionary::find_or_define_instance_class(Symbol* class_name, Handle class_loader, instanceKlassHandle k, TRAPS) { |
duke@435 | 1475 | |
duke@435 | 1476 | instanceKlassHandle nh = instanceKlassHandle(); // null Handle |
coleenp@2497 | 1477 | Symbol* name_h = k->name(); // passed in class_name may be null |
coleenp@4037 | 1478 | ClassLoaderData* loader_data = class_loader_data(class_loader); |
coleenp@4037 | 1479 | |
coleenp@4037 | 1480 | unsigned int d_hash = dictionary()->compute_hash(name_h, loader_data); |
duke@435 | 1481 | int d_index = dictionary()->hash_to_index(d_hash); |
duke@435 | 1482 | |
duke@435 | 1483 | // Hold SD lock around find_class and placeholder creation for DEFINE_CLASS |
coleenp@4037 | 1484 | unsigned int p_hash = placeholders()->compute_hash(name_h, loader_data); |
duke@435 | 1485 | int p_index = placeholders()->hash_to_index(p_hash); |
duke@435 | 1486 | PlaceholderEntry* probe; |
duke@435 | 1487 | |
duke@435 | 1488 | { |
duke@435 | 1489 | MutexLocker mu(SystemDictionary_lock, THREAD); |
duke@435 | 1490 | // First check if class already defined |
acorn@1510 | 1491 | if (UnsyncloadClass || (is_parallelDefine(class_loader))) { |
coleenp@4037 | 1492 | Klass* check = find_class(d_index, d_hash, name_h, loader_data); |
acorn@1510 | 1493 | if (check != NULL) { |
acorn@1510 | 1494 | return(instanceKlassHandle(THREAD, check)); |
acorn@1510 | 1495 | } |
duke@435 | 1496 | } |
duke@435 | 1497 | |
duke@435 | 1498 | // Acquire define token for this class/classloader |
coleenp@4037 | 1499 | probe = placeholders()->find_and_add(p_index, p_hash, name_h, loader_data, PlaceholderTable::DEFINE_CLASS, NULL, THREAD); |
acorn@949 | 1500 | // Wait if another thread defining in parallel |
acorn@949 | 1501 | // All threads wait - even those that will throw duplicate class: otherwise |
acorn@949 | 1502 | // caller is surprised by LinkageError: duplicate, but findLoadedClass fails |
acorn@949 | 1503 | // if other thread has not finished updating dictionary |
acorn@949 | 1504 | while (probe->definer() != NULL) { |
acorn@949 | 1505 | SystemDictionary_lock->wait(); |
acorn@949 | 1506 | } |
acorn@949 | 1507 | // Only special cases allow parallel defines and can use other thread's results |
acorn@949 | 1508 | // Other cases fall through, and may run into duplicate defines |
acorn@949 | 1509 | // caught by finding an entry in the SystemDictionary |
hseigel@4278 | 1510 | if ((UnsyncloadClass || is_parallelDefine(class_loader)) && (probe->instance_klass() != NULL)) { |
acorn@4425 | 1511 | placeholders()->find_and_remove(p_index, p_hash, name_h, loader_data, PlaceholderTable::DEFINE_CLASS, THREAD); |
acorn@949 | 1512 | SystemDictionary_lock->notify_all(); |
jrose@866 | 1513 | #ifdef ASSERT |
coleenp@4037 | 1514 | Klass* check = find_class(d_index, d_hash, name_h, loader_data); |
acorn@949 | 1515 | assert(check != NULL, "definer missed recording success"); |
jrose@866 | 1516 | #endif |
hseigel@4278 | 1517 | return(instanceKlassHandle(THREAD, probe->instance_klass())); |
acorn@949 | 1518 | } else { |
acorn@949 | 1519 | // This thread will define the class (even if earlier thread tried and had an error) |
duke@435 | 1520 | probe->set_definer(THREAD); |
duke@435 | 1521 | } |
duke@435 | 1522 | } |
duke@435 | 1523 | |
duke@435 | 1524 | define_instance_class(k, THREAD); |
duke@435 | 1525 | |
duke@435 | 1526 | Handle linkage_exception = Handle(); // null handle |
duke@435 | 1527 | |
duke@435 | 1528 | // definer must notify any waiting threads |
duke@435 | 1529 | { |
duke@435 | 1530 | MutexLocker mu(SystemDictionary_lock, THREAD); |
coleenp@4037 | 1531 | PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name_h, loader_data); |
duke@435 | 1532 | assert(probe != NULL, "DEFINE_CLASS placeholder lost?"); |
duke@435 | 1533 | if (probe != NULL) { |
duke@435 | 1534 | if (HAS_PENDING_EXCEPTION) { |
duke@435 | 1535 | linkage_exception = Handle(THREAD,PENDING_EXCEPTION); |
duke@435 | 1536 | CLEAR_PENDING_EXCEPTION; |
duke@435 | 1537 | } else { |
hseigel@4278 | 1538 | probe->set_instance_klass(k()); |
duke@435 | 1539 | } |
duke@435 | 1540 | probe->set_definer(NULL); |
acorn@4425 | 1541 | placeholders()->find_and_remove(p_index, p_hash, name_h, loader_data, PlaceholderTable::DEFINE_CLASS, THREAD); |
duke@435 | 1542 | SystemDictionary_lock->notify_all(); |
duke@435 | 1543 | } |
duke@435 | 1544 | } |
duke@435 | 1545 | |
duke@435 | 1546 | // Can't throw exception while holding lock due to rank ordering |
duke@435 | 1547 | if (linkage_exception() != NULL) { |
duke@435 | 1548 | THROW_OOP_(linkage_exception(), nh); // throws exception and returns |
duke@435 | 1549 | } |
duke@435 | 1550 | |
duke@435 | 1551 | return k; |
duke@435 | 1552 | } |
duke@435 | 1553 | Handle SystemDictionary::compute_loader_lock_object(Handle class_loader, TRAPS) { |
duke@435 | 1554 | // If class_loader is NULL we synchronize on _system_loader_lock_obj |
duke@435 | 1555 | if (class_loader.is_null()) { |
duke@435 | 1556 | return Handle(THREAD, _system_loader_lock_obj); |
duke@435 | 1557 | } else { |
duke@435 | 1558 | return class_loader; |
duke@435 | 1559 | } |
duke@435 | 1560 | } |
duke@435 | 1561 | |
duke@435 | 1562 | // This method is added to check how often we have to wait to grab loader |
duke@435 | 1563 | // lock. The results are being recorded in the performance counters defined in |
duke@435 | 1564 | // ClassLoader::_sync_systemLoaderLockContentionRate and |
duke@435 | 1565 | // ClassLoader::_sync_nonSystemLoaderLockConteionRate. |
duke@435 | 1566 | void SystemDictionary::check_loader_lock_contention(Handle loader_lock, TRAPS) { |
duke@435 | 1567 | if (!UsePerfData) { |
duke@435 | 1568 | return; |
duke@435 | 1569 | } |
duke@435 | 1570 | |
duke@435 | 1571 | assert(!loader_lock.is_null(), "NULL lock object"); |
duke@435 | 1572 | |
duke@435 | 1573 | if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader_lock) |
duke@435 | 1574 | == ObjectSynchronizer::owner_other) { |
duke@435 | 1575 | // contention will likely happen, so increment the corresponding |
duke@435 | 1576 | // contention counter. |
duke@435 | 1577 | if (loader_lock() == _system_loader_lock_obj) { |
duke@435 | 1578 | ClassLoader::sync_systemLoaderLockContentionRate()->inc(); |
duke@435 | 1579 | } else { |
duke@435 | 1580 | ClassLoader::sync_nonSystemLoaderLockContentionRate()->inc(); |
duke@435 | 1581 | } |
duke@435 | 1582 | } |
duke@435 | 1583 | } |
duke@435 | 1584 | |
duke@435 | 1585 | // ---------------------------------------------------------------------------- |
duke@435 | 1586 | // Lookup |
duke@435 | 1587 | |
coleenp@4037 | 1588 | Klass* SystemDictionary::find_class(int index, unsigned int hash, |
coleenp@2497 | 1589 | Symbol* class_name, |
coleenp@4037 | 1590 | ClassLoaderData* loader_data) { |
duke@435 | 1591 | assert_locked_or_safepoint(SystemDictionary_lock); |
coleenp@4037 | 1592 | assert (index == dictionary()->index_for(class_name, loader_data), |
duke@435 | 1593 | "incorrect index?"); |
duke@435 | 1594 | |
coleenp@4037 | 1595 | Klass* k = dictionary()->find_class(index, hash, class_name, loader_data); |
duke@435 | 1596 | return k; |
duke@435 | 1597 | } |
duke@435 | 1598 | |
duke@435 | 1599 | |
duke@435 | 1600 | // Basic find on classes in the midst of being loaded |
coleenp@2497 | 1601 | Symbol* SystemDictionary::find_placeholder(Symbol* class_name, |
coleenp@4037 | 1602 | ClassLoaderData* loader_data) { |
duke@435 | 1603 | assert_locked_or_safepoint(SystemDictionary_lock); |
coleenp@4037 | 1604 | unsigned int p_hash = placeholders()->compute_hash(class_name, loader_data); |
coleenp@2497 | 1605 | int p_index = placeholders()->hash_to_index(p_hash); |
coleenp@4037 | 1606 | return placeholders()->find_entry(p_index, p_hash, class_name, loader_data); |
duke@435 | 1607 | } |
duke@435 | 1608 | |
duke@435 | 1609 | |
duke@435 | 1610 | // Used for assertions and verification only |
coleenp@4037 | 1611 | Klass* SystemDictionary::find_class(Symbol* class_name, ClassLoaderData* loader_data) { |
duke@435 | 1612 | #ifndef ASSERT |
johnc@4899 | 1613 | guarantee(VerifyBeforeGC || |
johnc@4899 | 1614 | VerifyDuringGC || |
johnc@4899 | 1615 | VerifyBeforeExit || |
johnc@4899 | 1616 | VerifyDuringStartup || |
duke@435 | 1617 | VerifyAfterGC, "too expensive"); |
duke@435 | 1618 | #endif |
duke@435 | 1619 | assert_locked_or_safepoint(SystemDictionary_lock); |
duke@435 | 1620 | |
duke@435 | 1621 | // First look in the loaded class array |
coleenp@4037 | 1622 | unsigned int d_hash = dictionary()->compute_hash(class_name, loader_data); |
duke@435 | 1623 | int d_index = dictionary()->hash_to_index(d_hash); |
coleenp@4037 | 1624 | return find_class(d_index, d_hash, class_name, loader_data); |
duke@435 | 1625 | } |
duke@435 | 1626 | |
duke@435 | 1627 | |
duke@435 | 1628 | // Get the next class in the diictionary. |
coleenp@4037 | 1629 | Klass* SystemDictionary::try_get_next_class() { |
duke@435 | 1630 | return dictionary()->try_get_next_class(); |
duke@435 | 1631 | } |
duke@435 | 1632 | |
duke@435 | 1633 | |
duke@435 | 1634 | // ---------------------------------------------------------------------------- |
duke@435 | 1635 | // Update hierachy. This is done before the new klass has been added to the SystemDictionary. The Recompile_lock |
duke@435 | 1636 | // is held, to ensure that the compiler is not using the class hierachy, and that deoptimization will kick in |
duke@435 | 1637 | // before a new class is used. |
duke@435 | 1638 | |
duke@435 | 1639 | void SystemDictionary::add_to_hierarchy(instanceKlassHandle k, TRAPS) { |
duke@435 | 1640 | assert(k.not_null(), "just checking"); |
never@2551 | 1641 | assert_locked_or_safepoint(Compile_lock); |
never@2551 | 1642 | |
duke@435 | 1643 | // Link into hierachy. Make sure the vtables are initialized before linking into |
duke@435 | 1644 | k->append_to_sibling_list(); // add to superklass/sibling list |
duke@435 | 1645 | k->process_interfaces(THREAD); // handle all "implements" declarations |
coleenp@4037 | 1646 | k->set_init_state(InstanceKlass::loaded); |
duke@435 | 1647 | // Now flush all code that depended on old class hierarchy. |
duke@435 | 1648 | // Note: must be done *after* linking k into the hierarchy (was bug 12/9/97) |
duke@435 | 1649 | // Also, first reinitialize vtable because it may have gotten out of synch |
duke@435 | 1650 | // while the new class wasn't connected to the class hierarchy. |
duke@435 | 1651 | Universe::flush_dependents_on(k); |
duke@435 | 1652 | } |
duke@435 | 1653 | |
duke@435 | 1654 | |
duke@435 | 1655 | // ---------------------------------------------------------------------------- |
duke@435 | 1656 | // GC support |
duke@435 | 1657 | |
duke@435 | 1658 | // Following roots during mark-sweep is separated in two phases. |
duke@435 | 1659 | // |
duke@435 | 1660 | // The first phase follows preloaded classes and all other system |
duke@435 | 1661 | // classes, since these will never get unloaded anyway. |
duke@435 | 1662 | // |
duke@435 | 1663 | // The second phase removes (unloads) unreachable classes from the |
duke@435 | 1664 | // system dictionary and follows the remaining classes' contents. |
duke@435 | 1665 | |
duke@435 | 1666 | void SystemDictionary::always_strong_oops_do(OopClosure* blk) { |
duke@435 | 1667 | blk->do_oop(&_java_system_loader); |
coleenp@4037 | 1668 | blk->do_oop(&_system_loader_lock_obj); |
coleenp@4037 | 1669 | |
coleenp@4037 | 1670 | dictionary()->always_strong_oops_do(blk); |
stefank@4175 | 1671 | |
stefank@4175 | 1672 | // Visit extra methods |
stefank@4175 | 1673 | invoke_method_table()->oops_do(blk); |
duke@435 | 1674 | } |
duke@435 | 1675 | |
coleenp@4037 | 1676 | void SystemDictionary::always_strong_classes_do(KlassClosure* closure) { |
duke@435 | 1677 | // Follow all system classes and temporary placeholders in dictionary |
coleenp@4037 | 1678 | dictionary()->always_strong_classes_do(closure); |
coleenp@4037 | 1679 | |
coleenp@4037 | 1680 | // Placeholders. These represent classes we're actively loading. |
coleenp@4037 | 1681 | placeholders()->classes_do(closure); |
duke@435 | 1682 | } |
duke@435 | 1683 | |
acorn@3491 | 1684 | // Calculate a "good" systemdictionary size based |
acorn@3491 | 1685 | // on predicted or current loaded classes count |
acorn@3491 | 1686 | int SystemDictionary::calculate_systemdictionary_size(int classcount) { |
acorn@3491 | 1687 | int newsize = _old_default_sdsize; |
acorn@3491 | 1688 | if ((classcount > 0) && !DumpSharedSpaces) { |
acorn@3491 | 1689 | int desiredsize = classcount/_average_depth_goal; |
acorn@3491 | 1690 | for (newsize = _primelist[_sdgeneration]; _sdgeneration < _prime_array_size -1; |
acorn@3491 | 1691 | newsize = _primelist[++_sdgeneration]) { |
acorn@3491 | 1692 | if (desiredsize <= newsize) { |
acorn@3491 | 1693 | break; |
acorn@3491 | 1694 | } |
acorn@3491 | 1695 | } |
acorn@3491 | 1696 | } |
acorn@3491 | 1697 | return newsize; |
acorn@3491 | 1698 | } |
sla@5237 | 1699 | |
acorn@4425 | 1700 | // Assumes classes in the SystemDictionary are only unloaded at a safepoint |
acorn@4425 | 1701 | // Note: anonymous classes are not in the SD. |
duke@435 | 1702 | bool SystemDictionary::do_unloading(BoolObjectClosure* is_alive) { |
coleenp@4037 | 1703 | // First, mark for unload all ClassLoaderData referencing a dead class loader. |
coleenp@4037 | 1704 | bool has_dead_loaders = ClassLoaderDataGraph::do_unloading(is_alive); |
coleenp@4037 | 1705 | bool unloading_occurred = false; |
coleenp@4037 | 1706 | if (has_dead_loaders) { |
coleenp@4037 | 1707 | unloading_occurred = dictionary()->do_unloading(); |
coleenp@4037 | 1708 | constraints()->purge_loader_constraints(); |
coleenp@4037 | 1709 | resolution_errors()->purge_resolution_errors(); |
duke@435 | 1710 | } |
coleenp@4037 | 1711 | return unloading_occurred; |
coleenp@4037 | 1712 | } |
coleenp@4037 | 1713 | |
duke@435 | 1714 | void SystemDictionary::oops_do(OopClosure* f) { |
duke@435 | 1715 | f->do_oop(&_java_system_loader); |
coleenp@4037 | 1716 | f->do_oop(&_system_loader_lock_obj); |
duke@435 | 1717 | |
duke@435 | 1718 | // Adjust dictionary |
duke@435 | 1719 | dictionary()->oops_do(f); |
duke@435 | 1720 | |
jrose@1145 | 1721 | // Visit extra methods |
twisti@2258 | 1722 | invoke_method_table()->oops_do(f); |
duke@435 | 1723 | } |
duke@435 | 1724 | |
coleenp@4037 | 1725 | // Extended Class redefinition support. |
coleenp@4037 | 1726 | // If one of these classes is replaced, we need to replace it in these places. |
coleenp@4037 | 1727 | // KlassClosure::do_klass should take the address of a class but we can |
coleenp@4037 | 1728 | // change that later. |
coleenp@4037 | 1729 | void SystemDictionary::preloaded_classes_do(KlassClosure* f) { |
jrose@567 | 1730 | for (int k = (int)FIRST_WKID; k < (int)WKID_LIMIT; k++) { |
coleenp@4037 | 1731 | f->do_klass(_well_known_klasses[k]); |
jrose@567 | 1732 | } |
duke@435 | 1733 | |
duke@435 | 1734 | { |
duke@435 | 1735 | for (int i = 0; i < T_VOID+1; i++) { |
duke@435 | 1736 | if (_box_klasses[i] != NULL) { |
duke@435 | 1737 | assert(i >= T_BOOLEAN, "checking"); |
coleenp@4037 | 1738 | f->do_klass(_box_klasses[i]); |
duke@435 | 1739 | } |
duke@435 | 1740 | } |
duke@435 | 1741 | } |
duke@435 | 1742 | |
coleenp@4037 | 1743 | FilteredFieldsMap::classes_do(f); |
duke@435 | 1744 | } |
duke@435 | 1745 | |
coleenp@4037 | 1746 | void SystemDictionary::lazily_loaded_classes_do(KlassClosure* f) { |
coleenp@4037 | 1747 | f->do_klass(_abstract_ownable_synchronizer_klass); |
duke@435 | 1748 | } |
duke@435 | 1749 | |
duke@435 | 1750 | // Just the classes from defining class loaders |
duke@435 | 1751 | // Don't iterate over placeholders |
coleenp@4037 | 1752 | void SystemDictionary::classes_do(void f(Klass*)) { |
duke@435 | 1753 | dictionary()->classes_do(f); |
duke@435 | 1754 | } |
duke@435 | 1755 | |
duke@435 | 1756 | // Added for initialize_itable_for_klass |
duke@435 | 1757 | // Just the classes from defining class loaders |
duke@435 | 1758 | // Don't iterate over placeholders |
coleenp@4037 | 1759 | void SystemDictionary::classes_do(void f(Klass*, TRAPS), TRAPS) { |
duke@435 | 1760 | dictionary()->classes_do(f, CHECK); |
duke@435 | 1761 | } |
duke@435 | 1762 | |
duke@435 | 1763 | // All classes, and their class loaders |
duke@435 | 1764 | // Don't iterate over placeholders |
coleenp@4037 | 1765 | void SystemDictionary::classes_do(void f(Klass*, ClassLoaderData*)) { |
duke@435 | 1766 | dictionary()->classes_do(f); |
duke@435 | 1767 | } |
duke@435 | 1768 | |
coleenp@4037 | 1769 | void SystemDictionary::placeholders_do(void f(Symbol*)) { |
duke@435 | 1770 | placeholders()->entries_do(f); |
duke@435 | 1771 | } |
duke@435 | 1772 | |
coleenp@4037 | 1773 | void SystemDictionary::methods_do(void f(Method*)) { |
duke@435 | 1774 | dictionary()->methods_do(f); |
twisti@2258 | 1775 | invoke_method_table()->methods_do(f); |
duke@435 | 1776 | } |
duke@435 | 1777 | |
duke@435 | 1778 | // ---------------------------------------------------------------------------- |
duke@435 | 1779 | // Lazily load klasses |
duke@435 | 1780 | |
duke@435 | 1781 | void SystemDictionary::load_abstract_ownable_synchronizer_klass(TRAPS) { |
duke@435 | 1782 | assert(JDK_Version::is_gte_jdk16x_version(), "Must be JDK 1.6 or later"); |
duke@435 | 1783 | |
duke@435 | 1784 | // if multiple threads calling this function, only one thread will load |
duke@435 | 1785 | // the class. The other threads will find the loaded version once the |
duke@435 | 1786 | // class is loaded. |
coleenp@4037 | 1787 | Klass* aos = _abstract_ownable_synchronizer_klass; |
duke@435 | 1788 | if (aos == NULL) { |
coleenp@4037 | 1789 | Klass* k = resolve_or_fail(vmSymbols::java_util_concurrent_locks_AbstractOwnableSynchronizer(), true, CHECK); |
duke@435 | 1790 | // Force a fence to prevent any read before the write completes |
duke@435 | 1791 | OrderAccess::fence(); |
duke@435 | 1792 | _abstract_ownable_synchronizer_klass = k; |
duke@435 | 1793 | } |
duke@435 | 1794 | } |
duke@435 | 1795 | |
duke@435 | 1796 | // ---------------------------------------------------------------------------- |
duke@435 | 1797 | // Initialization |
duke@435 | 1798 | |
duke@435 | 1799 | void SystemDictionary::initialize(TRAPS) { |
duke@435 | 1800 | // Allocate arrays |
duke@435 | 1801 | assert(dictionary() == NULL, |
duke@435 | 1802 | "SystemDictionary should only be initialized once"); |
acorn@3491 | 1803 | _sdgeneration = 0; |
acorn@3491 | 1804 | _dictionary = new Dictionary(calculate_systemdictionary_size(PredictedLoadedClassCount)); |
twisti@2258 | 1805 | _placeholders = new PlaceholderTable(_nof_buckets); |
duke@435 | 1806 | _number_of_modifications = 0; |
twisti@2258 | 1807 | _loader_constraints = new LoaderConstraintTable(_loader_constraint_size); |
twisti@2258 | 1808 | _resolution_errors = new ResolutionErrorTable(_resolution_error_size); |
twisti@2258 | 1809 | _invoke_method_table = new SymbolPropertyTable(_invoke_method_size); |
duke@435 | 1810 | |
duke@435 | 1811 | // Allocate private object used as system class loader lock |
coleenp@4037 | 1812 | _system_loader_lock_obj = oopFactory::new_intArray(0, CHECK); |
duke@435 | 1813 | // Initialize basic classes |
duke@435 | 1814 | initialize_preloaded_classes(CHECK); |
duke@435 | 1815 | } |
duke@435 | 1816 | |
jrose@567 | 1817 | // Compact table of directions on the initialization of klasses: |
jrose@567 | 1818 | static const short wk_init_info[] = { |
jrose@567 | 1819 | #define WK_KLASS_INIT_INFO(name, symbol, option) \ |
jrose@567 | 1820 | ( ((int)vmSymbols::VM_SYMBOL_ENUM_NAME(symbol) \ |
jrose@567 | 1821 | << SystemDictionary::CEIL_LG_OPTION_LIMIT) \ |
jrose@567 | 1822 | | (int)SystemDictionary::option ), |
jrose@567 | 1823 | WK_KLASSES_DO(WK_KLASS_INIT_INFO) |
jrose@567 | 1824 | #undef WK_KLASS_INIT_INFO |
jrose@567 | 1825 | 0 |
jrose@567 | 1826 | }; |
jrose@567 | 1827 | |
jrose@567 | 1828 | bool SystemDictionary::initialize_wk_klass(WKID id, int init_opt, TRAPS) { |
jrose@567 | 1829 | assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
jrose@567 | 1830 | int info = wk_init_info[id - FIRST_WKID]; |
jrose@567 | 1831 | int sid = (info >> CEIL_LG_OPTION_LIMIT); |
coleenp@2497 | 1832 | Symbol* symbol = vmSymbols::symbol_at((vmSymbols::SID)sid); |
coleenp@4037 | 1833 | Klass** klassp = &_well_known_klasses[id]; |
jrose@2742 | 1834 | bool must_load = (init_opt < SystemDictionary::Opt); |
zgu@4492 | 1835 | if ((*klassp) == NULL) { |
jrose@567 | 1836 | if (must_load) { |
jrose@567 | 1837 | (*klassp) = resolve_or_fail(symbol, true, CHECK_0); // load required class |
jrose@567 | 1838 | } else { |
jrose@567 | 1839 | (*klassp) = resolve_or_null(symbol, CHECK_0); // load optional klass |
jrose@567 | 1840 | } |
jrose@567 | 1841 | } |
jrose@2742 | 1842 | return ((*klassp) != NULL); |
jrose@567 | 1843 | } |
jrose@567 | 1844 | |
jrose@567 | 1845 | void SystemDictionary::initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS) { |
jrose@567 | 1846 | assert((int)start_id <= (int)limit_id, "IDs are out of order!"); |
jrose@567 | 1847 | for (int id = (int)start_id; id < (int)limit_id; id++) { |
jrose@567 | 1848 | assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
jrose@567 | 1849 | int info = wk_init_info[id - FIRST_WKID]; |
jrose@567 | 1850 | int sid = (info >> CEIL_LG_OPTION_LIMIT); |
jrose@567 | 1851 | int opt = (info & right_n_bits(CEIL_LG_OPTION_LIMIT)); |
jrose@567 | 1852 | |
jrose@567 | 1853 | initialize_wk_klass((WKID)id, opt, CHECK); |
jrose@567 | 1854 | } |
jrose@1145 | 1855 | |
jrose@1145 | 1856 | // move the starting value forward to the limit: |
jrose@1145 | 1857 | start_id = limit_id; |
jrose@567 | 1858 | } |
jrose@567 | 1859 | |
duke@435 | 1860 | void SystemDictionary::initialize_preloaded_classes(TRAPS) { |
never@1577 | 1861 | assert(WK_KLASS(Object_klass) == NULL, "preloaded classes should only be initialized once"); |
duke@435 | 1862 | // Preload commonly used klasses |
jrose@567 | 1863 | WKID scan = FIRST_WKID; |
coleenp@4037 | 1864 | // first do Object, then String, Class |
coleenp@4037 | 1865 | if (UseSharedSpaces) { |
coleenp@4037 | 1866 | initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Object_klass), scan, CHECK); |
coleenp@4037 | 1867 | // Initialize the constant pool for the Object_class |
coleenp@4037 | 1868 | InstanceKlass* ik = InstanceKlass::cast(Object_klass()); |
coleenp@4037 | 1869 | ik->constants()->restore_unshareable_info(CHECK); |
coleenp@4045 | 1870 | initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Class_klass), scan, CHECK); |
coleenp@4037 | 1871 | } else { |
coleenp@4037 | 1872 | initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Class_klass), scan, CHECK); |
coleenp@4037 | 1873 | } |
jrose@567 | 1874 | |
kvn@3760 | 1875 | // Calculate offsets for String and Class classes since they are loaded and |
kvn@3760 | 1876 | // can be used after this point. |
kvn@3760 | 1877 | java_lang_String::compute_offsets(); |
never@3137 | 1878 | java_lang_Class::compute_offsets(); |
jrose@567 | 1879 | |
duke@435 | 1880 | // Fixup mirrors for classes loaded before java.lang.Class. |
duke@435 | 1881 | // These calls iterate over the objects currently in the perm gen |
duke@435 | 1882 | // so calling them at this point is matters (not before when there |
duke@435 | 1883 | // are fewer objects and not later after there are more objects |
duke@435 | 1884 | // in the perm gen. |
duke@435 | 1885 | Universe::initialize_basic_type_mirrors(CHECK); |
duke@435 | 1886 | Universe::fixup_mirrors(CHECK); |
duke@435 | 1887 | |
jrose@567 | 1888 | // do a bunch more: |
never@1577 | 1889 | initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Reference_klass), scan, CHECK); |
duke@435 | 1890 | |
duke@435 | 1891 | // Preload ref klasses and set reference types |
coleenp@4037 | 1892 | InstanceKlass::cast(WK_KLASS(Reference_klass))->set_reference_type(REF_OTHER); |
coleenp@4047 | 1893 | InstanceRefKlass::update_nonstatic_oop_maps(WK_KLASS(Reference_klass)); |
duke@435 | 1894 | |
never@1577 | 1895 | initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(PhantomReference_klass), scan, CHECK); |
coleenp@4037 | 1896 | InstanceKlass::cast(WK_KLASS(SoftReference_klass))->set_reference_type(REF_SOFT); |
coleenp@4037 | 1897 | InstanceKlass::cast(WK_KLASS(WeakReference_klass))->set_reference_type(REF_WEAK); |
coleenp@4037 | 1898 | InstanceKlass::cast(WK_KLASS(FinalReference_klass))->set_reference_type(REF_FINAL); |
coleenp@4037 | 1899 | InstanceKlass::cast(WK_KLASS(PhantomReference_klass))->set_reference_type(REF_PHANTOM); |
duke@435 | 1900 | |
twisti@2698 | 1901 | // JSR 292 classes |
twisti@2698 | 1902 | WKID jsr292_group_start = WK_KLASS_ENUM_NAME(MethodHandle_klass); |
twisti@3050 | 1903 | WKID jsr292_group_end = WK_KLASS_ENUM_NAME(VolatileCallSite_klass); |
twisti@2698 | 1904 | initialize_wk_klasses_until(jsr292_group_start, scan, CHECK); |
jrose@1161 | 1905 | if (EnableInvokeDynamic) { |
twisti@2698 | 1906 | initialize_wk_klasses_through(jsr292_group_end, scan, CHECK); |
twisti@2698 | 1907 | } else { |
twisti@2698 | 1908 | // Skip the JSR 292 classes, if not enabled. |
twisti@2698 | 1909 | scan = WKID(jsr292_group_end + 1); |
jrose@1161 | 1910 | } |
jrose@1145 | 1911 | |
jrose@567 | 1912 | initialize_wk_klasses_until(WKID_LIMIT, scan, CHECK); |
duke@435 | 1913 | |
never@1577 | 1914 | _box_klasses[T_BOOLEAN] = WK_KLASS(Boolean_klass); |
never@1577 | 1915 | _box_klasses[T_CHAR] = WK_KLASS(Character_klass); |
never@1577 | 1916 | _box_klasses[T_FLOAT] = WK_KLASS(Float_klass); |
never@1577 | 1917 | _box_klasses[T_DOUBLE] = WK_KLASS(Double_klass); |
never@1577 | 1918 | _box_klasses[T_BYTE] = WK_KLASS(Byte_klass); |
never@1577 | 1919 | _box_klasses[T_SHORT] = WK_KLASS(Short_klass); |
never@1577 | 1920 | _box_klasses[T_INT] = WK_KLASS(Integer_klass); |
never@1577 | 1921 | _box_klasses[T_LONG] = WK_KLASS(Long_klass); |
jrose@567 | 1922 | //_box_klasses[T_OBJECT] = WK_KLASS(object_klass); |
jrose@567 | 1923 | //_box_klasses[T_ARRAY] = WK_KLASS(object_klass); |
duke@435 | 1924 | |
duke@435 | 1925 | { // Compute whether we should use loadClass or loadClassInternal when loading classes. |
coleenp@4037 | 1926 | Method* method = InstanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::loadClassInternal_name(), vmSymbols::string_class_signature()); |
duke@435 | 1927 | _has_loadClassInternal = (method != NULL); |
duke@435 | 1928 | } |
duke@435 | 1929 | { // Compute whether we should use checkPackageAccess or NOT |
coleenp@4037 | 1930 | Method* method = InstanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::checkPackageAccess_name(), vmSymbols::class_protectiondomain_signature()); |
duke@435 | 1931 | _has_checkPackageAccess = (method != NULL); |
duke@435 | 1932 | } |
duke@435 | 1933 | } |
duke@435 | 1934 | |
duke@435 | 1935 | // Tells if a given klass is a box (wrapper class, such as java.lang.Integer). |
duke@435 | 1936 | // If so, returns the basic type it holds. If not, returns T_OBJECT. |
coleenp@4037 | 1937 | BasicType SystemDictionary::box_klass_type(Klass* k) { |
duke@435 | 1938 | assert(k != NULL, ""); |
duke@435 | 1939 | for (int i = T_BOOLEAN; i < T_VOID+1; i++) { |
duke@435 | 1940 | if (_box_klasses[i] == k) |
duke@435 | 1941 | return (BasicType)i; |
duke@435 | 1942 | } |
duke@435 | 1943 | return T_OBJECT; |
duke@435 | 1944 | } |
duke@435 | 1945 | |
duke@435 | 1946 | // Constraints on class loaders. The details of the algorithm can be |
duke@435 | 1947 | // found in the OOPSLA'98 paper "Dynamic Class Loading in the Java |
duke@435 | 1948 | // Virtual Machine" by Sheng Liang and Gilad Bracha. The basic idea is |
duke@435 | 1949 | // that the system dictionary needs to maintain a set of contraints that |
duke@435 | 1950 | // must be satisfied by all classes in the dictionary. |
duke@435 | 1951 | // if defining is true, then LinkageError if already in systemDictionary |
coleenp@4037 | 1952 | // if initiating loader, then ok if InstanceKlass matches existing entry |
duke@435 | 1953 | |
duke@435 | 1954 | void SystemDictionary::check_constraints(int d_index, unsigned int d_hash, |
duke@435 | 1955 | instanceKlassHandle k, |
duke@435 | 1956 | Handle class_loader, bool defining, |
duke@435 | 1957 | TRAPS) { |
duke@435 | 1958 | const char *linkage_error = NULL; |
duke@435 | 1959 | { |
coleenp@2497 | 1960 | Symbol* name = k->name(); |
coleenp@4037 | 1961 | ClassLoaderData *loader_data = class_loader_data(class_loader); |
coleenp@4037 | 1962 | |
duke@435 | 1963 | MutexLocker mu(SystemDictionary_lock, THREAD); |
duke@435 | 1964 | |
coleenp@4037 | 1965 | Klass* check = find_class(d_index, d_hash, name, loader_data); |
coleenp@4037 | 1966 | if (check != (Klass*)NULL) { |
coleenp@4037 | 1967 | // if different InstanceKlass - duplicate class definition, |
duke@435 | 1968 | // else - ok, class loaded by a different thread in parallel, |
duke@435 | 1969 | // we should only have found it if it was done loading and ok to use |
duke@435 | 1970 | // system dictionary only holds instance classes, placeholders |
duke@435 | 1971 | // also holds array classes |
duke@435 | 1972 | |
coleenp@4037 | 1973 | assert(check->oop_is_instance(), "noninstance in systemdictionary"); |
duke@435 | 1974 | if ((defining == true) || (k() != check)) { |
duke@435 | 1975 | linkage_error = "loader (instance of %s): attempted duplicate class " |
duke@435 | 1976 | "definition for name: \"%s\""; |
duke@435 | 1977 | } else { |
duke@435 | 1978 | return; |
duke@435 | 1979 | } |
duke@435 | 1980 | } |
duke@435 | 1981 | |
duke@435 | 1982 | #ifdef ASSERT |
coleenp@4037 | 1983 | Symbol* ph_check = find_placeholder(name, loader_data); |
coleenp@2497 | 1984 | assert(ph_check == NULL || ph_check == name, "invalid symbol"); |
duke@435 | 1985 | #endif |
duke@435 | 1986 | |
duke@435 | 1987 | if (linkage_error == NULL) { |
duke@435 | 1988 | if (constraints()->check_or_update(k, class_loader, name) == false) { |
duke@435 | 1989 | linkage_error = "loader constraint violation: loader (instance of %s)" |
duke@435 | 1990 | " previously initiated loading for a different type with name \"%s\""; |
duke@435 | 1991 | } |
duke@435 | 1992 | } |
duke@435 | 1993 | } |
duke@435 | 1994 | |
duke@435 | 1995 | // Throw error now if needed (cannot throw while holding |
duke@435 | 1996 | // SystemDictionary_lock because of rank ordering) |
duke@435 | 1997 | |
duke@435 | 1998 | if (linkage_error) { |
duke@435 | 1999 | ResourceMark rm(THREAD); |
duke@435 | 2000 | const char* class_loader_name = loader_name(class_loader()); |
duke@435 | 2001 | char* type_name = k->name()->as_C_string(); |
duke@435 | 2002 | size_t buflen = strlen(linkage_error) + strlen(class_loader_name) + |
duke@435 | 2003 | strlen(type_name); |
duke@435 | 2004 | char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); |
duke@435 | 2005 | jio_snprintf(buf, buflen, linkage_error, class_loader_name, type_name); |
duke@435 | 2006 | THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); |
duke@435 | 2007 | } |
duke@435 | 2008 | } |
duke@435 | 2009 | |
duke@435 | 2010 | |
duke@435 | 2011 | // Update system dictionary - done after check_constraint and add_to_hierachy |
duke@435 | 2012 | // have been called. |
duke@435 | 2013 | void SystemDictionary::update_dictionary(int d_index, unsigned int d_hash, |
duke@435 | 2014 | int p_index, unsigned int p_hash, |
duke@435 | 2015 | instanceKlassHandle k, |
duke@435 | 2016 | Handle class_loader, |
duke@435 | 2017 | TRAPS) { |
duke@435 | 2018 | // Compile_lock prevents systemDictionary updates during compilations |
duke@435 | 2019 | assert_locked_or_safepoint(Compile_lock); |
coleenp@2497 | 2020 | Symbol* name = k->name(); |
coleenp@4037 | 2021 | ClassLoaderData *loader_data = class_loader_data(class_loader); |
duke@435 | 2022 | |
duke@435 | 2023 | { |
duke@435 | 2024 | MutexLocker mu1(SystemDictionary_lock, THREAD); |
duke@435 | 2025 | |
duke@435 | 2026 | // See whether biased locking is enabled and if so set it for this |
duke@435 | 2027 | // klass. |
duke@435 | 2028 | // Note that this must be done past the last potential blocking |
duke@435 | 2029 | // point / safepoint. We enable biased locking lazily using a |
duke@435 | 2030 | // VM_Operation to iterate the SystemDictionary and installing the |
coleenp@4037 | 2031 | // biasable mark word into each InstanceKlass's prototype header. |
duke@435 | 2032 | // To avoid race conditions where we accidentally miss enabling the |
duke@435 | 2033 | // optimization for one class in the process of being added to the |
duke@435 | 2034 | // dictionary, we must not safepoint after the test of |
duke@435 | 2035 | // BiasedLocking::enabled(). |
duke@435 | 2036 | if (UseBiasedLocking && BiasedLocking::enabled()) { |
duke@435 | 2037 | // Set biased locking bit for all loaded classes; it will be |
duke@435 | 2038 | // cleared if revocation occurs too often for this type |
duke@435 | 2039 | // NOTE that we must only do this when the class is initally |
duke@435 | 2040 | // defined, not each time it is referenced from a new class loader |
duke@435 | 2041 | if (k->class_loader() == class_loader()) { |
duke@435 | 2042 | k->set_prototype_header(markOopDesc::biased_locking_prototype()); |
duke@435 | 2043 | } |
duke@435 | 2044 | } |
duke@435 | 2045 | |
acorn@4425 | 2046 | // Make a new system dictionary entry. |
coleenp@4037 | 2047 | Klass* sd_check = find_class(d_index, d_hash, name, loader_data); |
duke@435 | 2048 | if (sd_check == NULL) { |
coleenp@4037 | 2049 | dictionary()->add_klass(name, loader_data, k); |
duke@435 | 2050 | notice_modification(); |
duke@435 | 2051 | } |
duke@435 | 2052 | #ifdef ASSERT |
coleenp@4037 | 2053 | sd_check = find_class(d_index, d_hash, name, loader_data); |
duke@435 | 2054 | assert (sd_check != NULL, "should have entry in system dictionary"); |
acorn@4425 | 2055 | // Note: there may be a placeholder entry: for circularity testing |
acorn@4425 | 2056 | // or for parallel defines |
duke@435 | 2057 | #endif |
duke@435 | 2058 | SystemDictionary_lock->notify_all(); |
duke@435 | 2059 | } |
duke@435 | 2060 | } |
duke@435 | 2061 | |
duke@435 | 2062 | |
never@2551 | 2063 | // Try to find a class name using the loader constraints. The |
never@2551 | 2064 | // loader constraints might know about a class that isn't fully loaded |
never@2551 | 2065 | // yet and these will be ignored. |
coleenp@4037 | 2066 | Klass* SystemDictionary::find_constrained_instance_or_array_klass( |
coleenp@2497 | 2067 | Symbol* class_name, Handle class_loader, TRAPS) { |
duke@435 | 2068 | |
duke@435 | 2069 | // First see if it has been loaded directly. |
duke@435 | 2070 | // Force the protection domain to be null. (This removes protection checks.) |
duke@435 | 2071 | Handle no_protection_domain; |
coleenp@4037 | 2072 | Klass* klass = find_instance_or_array_klass(class_name, class_loader, |
coleenp@4142 | 2073 | no_protection_domain, CHECK_NULL); |
duke@435 | 2074 | if (klass != NULL) |
duke@435 | 2075 | return klass; |
duke@435 | 2076 | |
duke@435 | 2077 | // Now look to see if it has been loaded elsewhere, and is subject to |
duke@435 | 2078 | // a loader constraint that would require this loader to return the |
duke@435 | 2079 | // klass that is already loaded. |
coleenp@2497 | 2080 | if (FieldType::is_array(class_name)) { |
coleenp@4037 | 2081 | // For array classes, their Klass*s are not kept in the |
coleenp@4037 | 2082 | // constraint table. The element Klass*s are. |
coleenp@2497 | 2083 | FieldArrayInfo fd; |
coleenp@2497 | 2084 | BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
duke@435 | 2085 | if (t != T_OBJECT) { |
duke@435 | 2086 | klass = Universe::typeArrayKlassObj(t); |
duke@435 | 2087 | } else { |
duke@435 | 2088 | MutexLocker mu(SystemDictionary_lock, THREAD); |
coleenp@2497 | 2089 | klass = constraints()->find_constrained_klass(fd.object_key(), class_loader); |
duke@435 | 2090 | } |
acorn@1771 | 2091 | // If element class already loaded, allocate array klass |
duke@435 | 2092 | if (klass != NULL) { |
hseigel@4278 | 2093 | klass = klass->array_klass_or_null(fd.dimension()); |
duke@435 | 2094 | } |
duke@435 | 2095 | } else { |
duke@435 | 2096 | MutexLocker mu(SystemDictionary_lock, THREAD); |
duke@435 | 2097 | // Non-array classes are easy: simply check the constraint table. |
duke@435 | 2098 | klass = constraints()->find_constrained_klass(class_name, class_loader); |
duke@435 | 2099 | } |
duke@435 | 2100 | |
duke@435 | 2101 | return klass; |
duke@435 | 2102 | } |
duke@435 | 2103 | |
duke@435 | 2104 | |
coleenp@2497 | 2105 | bool SystemDictionary::add_loader_constraint(Symbol* class_name, |
duke@435 | 2106 | Handle class_loader1, |
duke@435 | 2107 | Handle class_loader2, |
duke@435 | 2108 | Thread* THREAD) { |
coleenp@4037 | 2109 | ClassLoaderData* loader_data1 = class_loader_data(class_loader1); |
coleenp@4037 | 2110 | ClassLoaderData* loader_data2 = class_loader_data(class_loader2); |
coleenp@4037 | 2111 | |
coleenp@2497 | 2112 | Symbol* constraint_name = NULL; |
coleenp@2497 | 2113 | if (!FieldType::is_array(class_name)) { |
acorn@1771 | 2114 | constraint_name = class_name; |
acorn@1771 | 2115 | } else { |
coleenp@4037 | 2116 | // For array classes, their Klass*s are not kept in the |
acorn@1771 | 2117 | // constraint table. The element classes are. |
coleenp@2497 | 2118 | FieldArrayInfo fd; |
coleenp@2497 | 2119 | BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(false)); |
acorn@1771 | 2120 | // primitive types always pass |
acorn@1771 | 2121 | if (t != T_OBJECT) { |
acorn@1771 | 2122 | return true; |
acorn@1771 | 2123 | } else { |
coleenp@2497 | 2124 | constraint_name = fd.object_key(); |
acorn@1771 | 2125 | } |
acorn@1771 | 2126 | } |
coleenp@4037 | 2127 | unsigned int d_hash1 = dictionary()->compute_hash(constraint_name, loader_data1); |
duke@435 | 2128 | int d_index1 = dictionary()->hash_to_index(d_hash1); |
duke@435 | 2129 | |
coleenp@4037 | 2130 | unsigned int d_hash2 = dictionary()->compute_hash(constraint_name, loader_data2); |
duke@435 | 2131 | int d_index2 = dictionary()->hash_to_index(d_hash2); |
acorn@1771 | 2132 | { |
acorn@1771 | 2133 | MutexLocker mu_s(SystemDictionary_lock, THREAD); |
duke@435 | 2134 | |
acorn@1771 | 2135 | // Better never do a GC while we're holding these oops |
acorn@1771 | 2136 | No_Safepoint_Verifier nosafepoint; |
duke@435 | 2137 | |
coleenp@4037 | 2138 | Klass* klass1 = find_class(d_index1, d_hash1, constraint_name, loader_data1); |
coleenp@4037 | 2139 | Klass* klass2 = find_class(d_index2, d_hash2, constraint_name, loader_data2); |
acorn@1771 | 2140 | return constraints()->add_entry(constraint_name, klass1, class_loader1, |
acorn@1771 | 2141 | klass2, class_loader2); |
duke@435 | 2142 | } |
duke@435 | 2143 | } |
duke@435 | 2144 | |
duke@435 | 2145 | // Add entry to resolution error table to record the error when the first |
duke@435 | 2146 | // attempt to resolve a reference to a class has failed. |
coleenp@2497 | 2147 | void SystemDictionary::add_resolution_error(constantPoolHandle pool, int which, Symbol* error) { |
duke@435 | 2148 | unsigned int hash = resolution_errors()->compute_hash(pool, which); |
duke@435 | 2149 | int index = resolution_errors()->hash_to_index(hash); |
duke@435 | 2150 | { |
duke@435 | 2151 | MutexLocker ml(SystemDictionary_lock, Thread::current()); |
duke@435 | 2152 | resolution_errors()->add_entry(index, hash, pool, which, error); |
duke@435 | 2153 | } |
duke@435 | 2154 | } |
duke@435 | 2155 | |
coleenp@4037 | 2156 | // Delete a resolution error for RedefineClasses for a constant pool is going away |
coleenp@4037 | 2157 | void SystemDictionary::delete_resolution_error(ConstantPool* pool) { |
coleenp@4037 | 2158 | resolution_errors()->delete_entry(pool); |
coleenp@4037 | 2159 | } |
coleenp@4037 | 2160 | |
duke@435 | 2161 | // Lookup resolution error table. Returns error if found, otherwise NULL. |
coleenp@2497 | 2162 | Symbol* SystemDictionary::find_resolution_error(constantPoolHandle pool, int which) { |
duke@435 | 2163 | unsigned int hash = resolution_errors()->compute_hash(pool, which); |
duke@435 | 2164 | int index = resolution_errors()->hash_to_index(hash); |
duke@435 | 2165 | { |
duke@435 | 2166 | MutexLocker ml(SystemDictionary_lock, Thread::current()); |
duke@435 | 2167 | ResolutionErrorEntry* entry = resolution_errors()->find_entry(index, hash, pool, which); |
coleenp@2497 | 2168 | return (entry != NULL) ? entry->error() : (Symbol*)NULL; |
duke@435 | 2169 | } |
duke@435 | 2170 | } |
duke@435 | 2171 | |
duke@435 | 2172 | |
jrose@1100 | 2173 | // Signature constraints ensure that callers and callees agree about |
jrose@1100 | 2174 | // the meaning of type names in their signatures. This routine is the |
jrose@1100 | 2175 | // intake for constraints. It collects them from several places: |
jrose@1100 | 2176 | // |
jrose@1100 | 2177 | // * LinkResolver::resolve_method (if check_access is true) requires |
jrose@1100 | 2178 | // that the resolving class (the caller) and the defining class of |
jrose@1100 | 2179 | // the resolved method (the callee) agree on each type in the |
jrose@1100 | 2180 | // method's signature. |
jrose@1100 | 2181 | // |
jrose@1100 | 2182 | // * LinkResolver::resolve_interface_method performs exactly the same |
jrose@1100 | 2183 | // checks. |
jrose@1100 | 2184 | // |
jrose@1100 | 2185 | // * LinkResolver::resolve_field requires that the constant pool |
jrose@1100 | 2186 | // attempting to link to a field agree with the field's defining |
jrose@1100 | 2187 | // class about the type of the field signature. |
jrose@1100 | 2188 | // |
jrose@1100 | 2189 | // * klassVtable::initialize_vtable requires that, when a class |
jrose@1100 | 2190 | // overrides a vtable entry allocated by a superclass, that the |
jrose@1100 | 2191 | // overriding method (i.e., the callee) agree with the superclass |
jrose@1100 | 2192 | // on each type in the method's signature. |
jrose@1100 | 2193 | // |
jrose@1100 | 2194 | // * klassItable::initialize_itable requires that, when a class fills |
jrose@1100 | 2195 | // in its itables, for each non-abstract method installed in an |
jrose@1100 | 2196 | // itable, the method (i.e., the callee) agree with the interface |
jrose@1100 | 2197 | // on each type in the method's signature. |
jrose@1100 | 2198 | // |
jrose@1100 | 2199 | // All those methods have a boolean (check_access, checkconstraints) |
jrose@1100 | 2200 | // which turns off the checks. This is used from specialized contexts |
jrose@1100 | 2201 | // such as bootstrapping, dumping, and debugging. |
jrose@1100 | 2202 | // |
jrose@1100 | 2203 | // No direct constraint is placed between the class and its |
jrose@1100 | 2204 | // supertypes. Constraints are only placed along linked relations |
jrose@1100 | 2205 | // between callers and callees. When a method overrides or implements |
jrose@1100 | 2206 | // an abstract method in a supertype (superclass or interface), the |
jrose@1100 | 2207 | // constraints are placed as if the supertype were the caller to the |
jrose@1100 | 2208 | // overriding method. (This works well, since callers to the |
jrose@1100 | 2209 | // supertype have already established agreement between themselves and |
jrose@1100 | 2210 | // the supertype.) As a result of all this, a class can disagree with |
jrose@1100 | 2211 | // its supertype about the meaning of a type name, as long as that |
jrose@1100 | 2212 | // class neither calls a relevant method of the supertype, nor is |
jrose@1100 | 2213 | // called (perhaps via an override) from the supertype. |
jrose@1100 | 2214 | // |
jrose@1100 | 2215 | // |
jrose@1100 | 2216 | // SystemDictionary::check_signature_loaders(sig, l1, l2) |
jrose@1100 | 2217 | // |
duke@435 | 2218 | // Make sure all class components (including arrays) in the given |
duke@435 | 2219 | // signature will be resolved to the same class in both loaders. |
duke@435 | 2220 | // Returns the name of the type that failed a loader constraint check, or |
acorn@4840 | 2221 | // NULL if no constraint failed. No exception except OOME is thrown. |
acorn@1771 | 2222 | // Arrays are not added to the loader constraint table, their elements are. |
acorn@4840 | 2223 | Symbol* SystemDictionary::check_signature_loaders(Symbol* signature, |
duke@435 | 2224 | Handle loader1, Handle loader2, |
duke@435 | 2225 | bool is_method, TRAPS) { |
duke@435 | 2226 | // Nothing to do if loaders are the same. |
duke@435 | 2227 | if (loader1() == loader2()) { |
duke@435 | 2228 | return NULL; |
duke@435 | 2229 | } |
duke@435 | 2230 | |
duke@435 | 2231 | SignatureStream sig_strm(signature, is_method); |
duke@435 | 2232 | while (!sig_strm.is_done()) { |
duke@435 | 2233 | if (sig_strm.is_object()) { |
acorn@4840 | 2234 | Symbol* sig = sig_strm.as_symbol(CHECK_NULL); |
duke@435 | 2235 | if (!add_loader_constraint(sig, loader1, loader2, THREAD)) { |
acorn@4840 | 2236 | return sig; |
duke@435 | 2237 | } |
duke@435 | 2238 | } |
duke@435 | 2239 | sig_strm.next(); |
duke@435 | 2240 | } |
duke@435 | 2241 | return NULL; |
duke@435 | 2242 | } |
duke@435 | 2243 | |
duke@435 | 2244 | |
twisti@3969 | 2245 | methodHandle SystemDictionary::find_method_handle_intrinsic(vmIntrinsics::ID iid, |
twisti@3969 | 2246 | Symbol* signature, |
twisti@3969 | 2247 | TRAPS) { |
twisti@3969 | 2248 | methodHandle empty; |
twisti@3969 | 2249 | assert(EnableInvokeDynamic, ""); |
twisti@3969 | 2250 | assert(MethodHandles::is_signature_polymorphic(iid) && |
twisti@3969 | 2251 | MethodHandles::is_signature_polymorphic_intrinsic(iid) && |
twisti@3969 | 2252 | iid != vmIntrinsics::_invokeGeneric, |
twisti@3969 | 2253 | err_msg("must be a known MH intrinsic iid=%d: %s", iid, vmIntrinsics::name_at(iid))); |
twisti@3969 | 2254 | |
twisti@3969 | 2255 | unsigned int hash = invoke_method_table()->compute_hash(signature, iid); |
jrose@1145 | 2256 | int index = invoke_method_table()->hash_to_index(hash); |
twisti@3969 | 2257 | SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, iid); |
twisti@3969 | 2258 | methodHandle m; |
coleenp@4037 | 2259 | if (spe == NULL || spe->method() == NULL) { |
jrose@1863 | 2260 | spe = NULL; |
jrose@1145 | 2261 | // Must create lots of stuff here, but outside of the SystemDictionary lock. |
coleenp@4037 | 2262 | m = Method::make_method_handle_intrinsic(iid, signature, CHECK_(empty)); |
twisti@3969 | 2263 | CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_highest_tier, |
twisti@3969 | 2264 | methodHandle(), CompileThreshold, "MH", CHECK_(empty)); |
twisti@3969 | 2265 | |
jrose@1145 | 2266 | // Now grab the lock. We might have to throw away the new method, |
jrose@1145 | 2267 | // if a racing thread has managed to install one at the same time. |
twisti@3969 | 2268 | { |
twisti@3969 | 2269 | MutexLocker ml(SystemDictionary_lock, THREAD); |
twisti@3969 | 2270 | spe = invoke_method_table()->find_entry(index, hash, signature, iid); |
jrose@1145 | 2271 | if (spe == NULL) |
twisti@3969 | 2272 | spe = invoke_method_table()->add_entry(index, hash, signature, iid); |
coleenp@4037 | 2273 | if (spe->method() == NULL) |
coleenp@4037 | 2274 | spe->set_method(m()); |
jrose@1145 | 2275 | } |
jrose@1145 | 2276 | } |
twisti@3969 | 2277 | |
coleenp@4037 | 2278 | assert(spe != NULL && spe->method() != NULL, ""); |
coleenp@4037 | 2279 | return spe->method(); |
twisti@3969 | 2280 | } |
twisti@3969 | 2281 | |
twisti@3969 | 2282 | // Helper for unpacking the return value from linkMethod and linkCallSite. |
twisti@3969 | 2283 | static methodHandle unpack_method_and_appendix(Handle mname, |
coleenp@4304 | 2284 | KlassHandle accessing_klass, |
twisti@3969 | 2285 | objArrayHandle appendix_box, |
twisti@3969 | 2286 | Handle* appendix_result, |
twisti@3969 | 2287 | TRAPS) { |
twisti@3969 | 2288 | methodHandle empty; |
twisti@3969 | 2289 | if (mname.not_null()) { |
coleenp@4037 | 2290 | Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); |
twisti@3969 | 2291 | if (vmtarget != NULL && vmtarget->is_method()) { |
coleenp@4037 | 2292 | Method* m = (Method*)vmtarget; |
twisti@3969 | 2293 | oop appendix = appendix_box->obj_at(0); |
twisti@3969 | 2294 | if (TraceMethodHandles) { |
twisti@3969 | 2295 | #ifndef PRODUCT |
twisti@3969 | 2296 | tty->print("Linked method="INTPTR_FORMAT": ", m); |
twisti@3969 | 2297 | m->print(); |
twisti@3969 | 2298 | if (appendix != NULL) { tty->print("appendix = "); appendix->print(); } |
twisti@3969 | 2299 | tty->cr(); |
twisti@3969 | 2300 | #endif //PRODUCT |
twisti@3969 | 2301 | } |
twisti@3969 | 2302 | (*appendix_result) = Handle(THREAD, appendix); |
coleenp@4304 | 2303 | // the target is stored in the cpCache and if a reference to this |
coleenp@4304 | 2304 | // MethodName is dropped we need a way to make sure the |
coleenp@4304 | 2305 | // class_loader containing this method is kept alive. |
coleenp@4304 | 2306 | // FIXME: the appendix might also preserve this dependency. |
coleenp@4304 | 2307 | ClassLoaderData* this_key = InstanceKlass::cast(accessing_klass())->class_loader_data(); |
coleenp@4304 | 2308 | this_key->record_dependency(m->method_holder(), CHECK_NULL); // Can throw OOM |
twisti@3969 | 2309 | return methodHandle(THREAD, m); |
twisti@3969 | 2310 | } |
jrose@1863 | 2311 | } |
twisti@3969 | 2312 | THROW_MSG_(vmSymbols::java_lang_LinkageError(), "bad value from MethodHandleNatives", empty); |
twisti@3969 | 2313 | return empty; |
jrose@1145 | 2314 | } |
jrose@1145 | 2315 | |
twisti@3969 | 2316 | methodHandle SystemDictionary::find_method_handle_invoker(Symbol* name, |
twisti@3969 | 2317 | Symbol* signature, |
twisti@3969 | 2318 | KlassHandle accessing_klass, |
twisti@4133 | 2319 | Handle *appendix_result, |
twisti@4133 | 2320 | Handle *method_type_result, |
twisti@3969 | 2321 | TRAPS) { |
twisti@3969 | 2322 | methodHandle empty; |
twisti@3969 | 2323 | assert(EnableInvokeDynamic, ""); |
twisti@3969 | 2324 | assert(!THREAD->is_Compiler_thread(), ""); |
twisti@3969 | 2325 | Handle method_type = |
twisti@3969 | 2326 | SystemDictionary::find_method_handle_type(signature, accessing_klass, CHECK_(empty)); |
twisti@3969 | 2327 | if (false) { // FIXME: Decide if the Java upcall should resolve signatures. |
twisti@3969 | 2328 | method_type = java_lang_String::create_from_symbol(signature, CHECK_(empty)); |
twisti@3969 | 2329 | } |
twisti@3969 | 2330 | |
coleenp@4037 | 2331 | KlassHandle mh_klass = SystemDictionary::MethodHandle_klass(); |
twisti@3969 | 2332 | int ref_kind = JVM_REF_invokeVirtual; |
twisti@3969 | 2333 | Handle name_str = StringTable::intern(name, CHECK_(empty)); |
twisti@3969 | 2334 | objArrayHandle appendix_box = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1, CHECK_(empty)); |
twisti@3969 | 2335 | assert(appendix_box->obj_at(0) == NULL, ""); |
twisti@3969 | 2336 | |
twisti@3969 | 2337 | // call java.lang.invoke.MethodHandleNatives::linkMethod(... String, MethodType) -> MemberName |
twisti@3969 | 2338 | JavaCallArguments args; |
twisti@3969 | 2339 | args.push_oop(accessing_klass()->java_mirror()); |
twisti@3969 | 2340 | args.push_int(ref_kind); |
twisti@3969 | 2341 | args.push_oop(mh_klass()->java_mirror()); |
twisti@3969 | 2342 | args.push_oop(name_str()); |
twisti@3969 | 2343 | args.push_oop(method_type()); |
twisti@3969 | 2344 | args.push_oop(appendix_box()); |
twisti@3969 | 2345 | JavaValue result(T_OBJECT); |
twisti@3969 | 2346 | JavaCalls::call_static(&result, |
twisti@3969 | 2347 | SystemDictionary::MethodHandleNatives_klass(), |
twisti@3969 | 2348 | vmSymbols::linkMethod_name(), |
twisti@3969 | 2349 | vmSymbols::linkMethod_signature(), |
twisti@3969 | 2350 | &args, CHECK_(empty)); |
twisti@3969 | 2351 | Handle mname(THREAD, (oop) result.get_jobject()); |
twisti@4133 | 2352 | (*method_type_result) = method_type; |
coleenp@4304 | 2353 | return unpack_method_and_appendix(mname, accessing_klass, appendix_box, appendix_result, THREAD); |
twisti@3969 | 2354 | } |
twisti@3969 | 2355 | |
twisti@3969 | 2356 | |
jrose@2639 | 2357 | // Ask Java code to find or construct a java.lang.invoke.MethodType for the given |
jrose@1145 | 2358 | // signature, as interpreted relative to the given class loader. |
jrose@1145 | 2359 | // Because of class loader constraints, all method handle usage must be |
jrose@1145 | 2360 | // consistent with this loader. |
coleenp@2497 | 2361 | Handle SystemDictionary::find_method_handle_type(Symbol* signature, |
jrose@1863 | 2362 | KlassHandle accessing_klass, |
jrose@1862 | 2363 | TRAPS) { |
twisti@3969 | 2364 | Handle empty; |
twisti@3969 | 2365 | vmIntrinsics::ID null_iid = vmIntrinsics::_none; // distinct from all method handle invoker intrinsics |
twisti@3969 | 2366 | unsigned int hash = invoke_method_table()->compute_hash(signature, null_iid); |
twisti@3969 | 2367 | int index = invoke_method_table()->hash_to_index(hash); |
twisti@3969 | 2368 | SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, null_iid); |
coleenp@4037 | 2369 | if (spe != NULL && spe->method_type() != NULL) { |
coleenp@4037 | 2370 | assert(java_lang_invoke_MethodType::is_instance(spe->method_type()), ""); |
coleenp@4037 | 2371 | return Handle(THREAD, spe->method_type()); |
twisti@3969 | 2372 | } else if (THREAD->is_Compiler_thread()) { |
twisti@3969 | 2373 | warning("SystemDictionary::find_method_handle_type called from compiler thread"); // FIXME |
twisti@3969 | 2374 | return Handle(); // do not attempt from within compiler, unless it was cached |
twisti@3969 | 2375 | } |
twisti@3969 | 2376 | |
jrose@1863 | 2377 | Handle class_loader, protection_domain; |
jrose@1863 | 2378 | bool is_on_bcp = true; // keep this true as long as we can materialize from the boot classloader |
coleenp@2497 | 2379 | int npts = ArgumentCount(signature).size(); |
never@1577 | 2380 | objArrayHandle pts = oopFactory::new_objArray(SystemDictionary::Class_klass(), npts, CHECK_(empty)); |
jrose@1145 | 2381 | int arg = 0; |
jrose@1145 | 2382 | Handle rt; // the return type from the signature |
coleenp@2497 | 2383 | ResourceMark rm(THREAD); |
coleenp@2497 | 2384 | for (SignatureStream ss(signature); !ss.is_done(); ss.next()) { |
jrose@1863 | 2385 | oop mirror = NULL; |
jrose@1863 | 2386 | if (is_on_bcp) { |
twisti@3969 | 2387 | // Note: class_loader & protection_domain are both null at this point. |
jrose@1863 | 2388 | mirror = ss.as_java_mirror(class_loader, protection_domain, |
jrose@1863 | 2389 | SignatureStream::ReturnNull, CHECK_(empty)); |
jrose@1863 | 2390 | if (mirror == NULL) { |
jrose@1863 | 2391 | // fall back from BCP to accessing_klass |
jrose@1863 | 2392 | if (accessing_klass.not_null()) { |
coleenp@4037 | 2393 | class_loader = Handle(THREAD, InstanceKlass::cast(accessing_klass())->class_loader()); |
coleenp@4037 | 2394 | protection_domain = Handle(THREAD, InstanceKlass::cast(accessing_klass())->protection_domain()); |
jrose@1863 | 2395 | } |
jrose@1863 | 2396 | is_on_bcp = false; |
jrose@1863 | 2397 | } |
jrose@1863 | 2398 | } |
jrose@1863 | 2399 | if (!is_on_bcp) { |
jrose@1863 | 2400 | // Resolve, throwing a real error if it doesn't work. |
jrose@1863 | 2401 | mirror = ss.as_java_mirror(class_loader, protection_domain, |
jrose@1863 | 2402 | SignatureStream::NCDFError, CHECK_(empty)); |
jrose@1145 | 2403 | } |
jrose@1145 | 2404 | if (ss.at_return_type()) |
jrose@1145 | 2405 | rt = Handle(THREAD, mirror); |
jrose@1145 | 2406 | else |
jrose@1145 | 2407 | pts->obj_at_put(arg++, mirror); |
twisti@3969 | 2408 | |
jrose@1863 | 2409 | // Check accessibility. |
jrose@1863 | 2410 | if (ss.is_object() && accessing_klass.not_null()) { |
coleenp@4037 | 2411 | Klass* sel_klass = java_lang_Class::as_Klass(mirror); |
twisti@3969 | 2412 | mirror = NULL; // safety |
coleenp@4037 | 2413 | // Emulate ConstantPool::verify_constant_pool_resolve. |
hseigel@4278 | 2414 | if (sel_klass->oop_is_objArray()) |
coleenp@4142 | 2415 | sel_klass = ObjArrayKlass::cast(sel_klass)->bottom_klass(); |
hseigel@4278 | 2416 | if (sel_klass->oop_is_instance()) { |
jrose@1863 | 2417 | KlassHandle sel_kh(THREAD, sel_klass); |
jrose@1863 | 2418 | LinkResolver::check_klass_accessability(accessing_klass, sel_kh, CHECK_(empty)); |
jrose@1863 | 2419 | } |
jrose@1863 | 2420 | } |
jrose@1145 | 2421 | } |
jrose@1145 | 2422 | assert(arg == npts, ""); |
jrose@1145 | 2423 | |
jrose@2639 | 2424 | // call java.lang.invoke.MethodHandleNatives::findMethodType(Class rt, Class[] pts) -> MethodType |
jrose@1145 | 2425 | JavaCallArguments args(Handle(THREAD, rt())); |
jrose@1145 | 2426 | args.push_oop(pts()); |
jrose@1145 | 2427 | JavaValue result(T_OBJECT); |
jrose@1145 | 2428 | JavaCalls::call_static(&result, |
jrose@1862 | 2429 | SystemDictionary::MethodHandleNatives_klass(), |
jrose@1862 | 2430 | vmSymbols::findMethodHandleType_name(), |
jrose@2742 | 2431 | vmSymbols::findMethodHandleType_signature(), |
jrose@1145 | 2432 | &args, CHECK_(empty)); |
jrose@2148 | 2433 | Handle method_type(THREAD, (oop) result.get_jobject()); |
jrose@2148 | 2434 | |
twisti@3969 | 2435 | if (is_on_bcp) { |
twisti@3969 | 2436 | // We can cache this MethodType inside the JVM. |
twisti@3969 | 2437 | MutexLocker ml(SystemDictionary_lock, THREAD); |
twisti@3969 | 2438 | spe = invoke_method_table()->find_entry(index, hash, signature, null_iid); |
twisti@3969 | 2439 | if (spe == NULL) |
twisti@3969 | 2440 | spe = invoke_method_table()->add_entry(index, hash, signature, null_iid); |
coleenp@4037 | 2441 | if (spe->method_type() == NULL) { |
coleenp@4037 | 2442 | spe->set_method_type(method_type()); |
jrose@2148 | 2443 | } |
jrose@2148 | 2444 | } |
jrose@1863 | 2445 | |
twisti@3969 | 2446 | // report back to the caller with the MethodType |
jrose@2148 | 2447 | return method_type; |
jrose@1145 | 2448 | } |
jrose@1145 | 2449 | |
jrose@1957 | 2450 | // Ask Java code to find or construct a method handle constant. |
jrose@1957 | 2451 | Handle SystemDictionary::link_method_handle_constant(KlassHandle caller, |
jrose@1957 | 2452 | int ref_kind, //e.g., JVM_REF_invokeVirtual |
jrose@1957 | 2453 | KlassHandle callee, |
coleenp@2497 | 2454 | Symbol* name_sym, |
coleenp@2497 | 2455 | Symbol* signature, |
jrose@1957 | 2456 | TRAPS) { |
jrose@1957 | 2457 | Handle empty; |
coleenp@2497 | 2458 | Handle name = java_lang_String::create_from_symbol(name_sym, CHECK_(empty)); |
jrose@1957 | 2459 | Handle type; |
jrose@1957 | 2460 | if (signature->utf8_length() > 0 && signature->byte_at(0) == '(') { |
twisti@3969 | 2461 | type = find_method_handle_type(signature, caller, CHECK_(empty)); |
jrose@1957 | 2462 | } else { |
coleenp@2497 | 2463 | ResourceMark rm(THREAD); |
coleenp@2497 | 2464 | SignatureStream ss(signature, false); |
jrose@1957 | 2465 | if (!ss.is_done()) { |
jrose@1957 | 2466 | oop mirror = ss.as_java_mirror(caller->class_loader(), caller->protection_domain(), |
jrose@1957 | 2467 | SignatureStream::NCDFError, CHECK_(empty)); |
jrose@1957 | 2468 | type = Handle(THREAD, mirror); |
jrose@1957 | 2469 | ss.next(); |
jrose@1957 | 2470 | if (!ss.is_done()) type = Handle(); // error! |
jrose@1957 | 2471 | } |
jrose@1957 | 2472 | } |
jrose@1957 | 2473 | if (type.is_null()) { |
jrose@1957 | 2474 | THROW_MSG_(vmSymbols::java_lang_LinkageError(), "bad signature", empty); |
jrose@1957 | 2475 | } |
jrose@1957 | 2476 | |
jrose@2639 | 2477 | // call java.lang.invoke.MethodHandleNatives::linkMethodHandleConstant(Class caller, int refKind, Class callee, String name, Object type) -> MethodHandle |
jrose@1957 | 2478 | JavaCallArguments args; |
jrose@1957 | 2479 | args.push_oop(caller->java_mirror()); // the referring class |
jrose@1957 | 2480 | args.push_int(ref_kind); |
jrose@1957 | 2481 | args.push_oop(callee->java_mirror()); // the target class |
jrose@1957 | 2482 | args.push_oop(name()); |
jrose@1957 | 2483 | args.push_oop(type()); |
jrose@1957 | 2484 | JavaValue result(T_OBJECT); |
jrose@1957 | 2485 | JavaCalls::call_static(&result, |
jrose@1957 | 2486 | SystemDictionary::MethodHandleNatives_klass(), |
jrose@1957 | 2487 | vmSymbols::linkMethodHandleConstant_name(), |
jrose@2742 | 2488 | vmSymbols::linkMethodHandleConstant_signature(), |
jrose@1957 | 2489 | &args, CHECK_(empty)); |
jrose@1957 | 2490 | return Handle(THREAD, (oop) result.get_jobject()); |
jrose@1957 | 2491 | } |
jrose@1145 | 2492 | |
jrose@2639 | 2493 | // Ask Java code to find or construct a java.lang.invoke.CallSite for the given |
jrose@1161 | 2494 | // name and signature, as interpreted relative to the given class loader. |
twisti@3969 | 2495 | methodHandle SystemDictionary::find_dynamic_call_site_invoker(KlassHandle caller, |
twisti@3969 | 2496 | Handle bootstrap_specifier, |
twisti@3969 | 2497 | Symbol* name, |
twisti@3969 | 2498 | Symbol* type, |
twisti@4133 | 2499 | Handle *appendix_result, |
twisti@4133 | 2500 | Handle *method_type_result, |
twisti@3969 | 2501 | TRAPS) { |
twisti@3969 | 2502 | methodHandle empty; |
twisti@3969 | 2503 | Handle bsm, info; |
twisti@3969 | 2504 | if (java_lang_invoke_MethodHandle::is_instance(bootstrap_specifier())) { |
twisti@3969 | 2505 | bsm = bootstrap_specifier; |
twisti@3969 | 2506 | } else { |
twisti@3969 | 2507 | assert(bootstrap_specifier->is_objArray(), ""); |
twisti@3969 | 2508 | objArrayHandle args(THREAD, (objArrayOop) bootstrap_specifier()); |
twisti@3969 | 2509 | int len = args->length(); |
twisti@3969 | 2510 | assert(len >= 1, ""); |
twisti@3969 | 2511 | bsm = Handle(THREAD, args->obj_at(0)); |
twisti@3969 | 2512 | if (len > 1) { |
twisti@3969 | 2513 | objArrayOop args1 = oopFactory::new_objArray(SystemDictionary::Object_klass(), len-1, CHECK_(empty)); |
twisti@3969 | 2514 | for (int i = 1; i < len; i++) |
twisti@3969 | 2515 | args1->obj_at_put(i-1, args->obj_at(i)); |
twisti@3969 | 2516 | info = Handle(THREAD, args1); |
twisti@3969 | 2517 | } |
twisti@3969 | 2518 | } |
twisti@3969 | 2519 | guarantee(java_lang_invoke_MethodHandle::is_instance(bsm()), |
jrose@2015 | 2520 | "caller must supply a valid BSM"); |
jrose@2015 | 2521 | |
twisti@3969 | 2522 | Handle method_name = java_lang_String::create_from_symbol(name, CHECK_(empty)); |
twisti@3969 | 2523 | Handle method_type = find_method_handle_type(type, caller, CHECK_(empty)); |
twisti@3969 | 2524 | |
twisti@3969 | 2525 | objArrayHandle appendix_box = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1, CHECK_(empty)); |
twisti@3969 | 2526 | assert(appendix_box->obj_at(0) == NULL, ""); |
twisti@3969 | 2527 | |
twisti@3969 | 2528 | // call java.lang.invoke.MethodHandleNatives::linkCallSite(caller, bsm, name, mtype, info, &appendix) |
twisti@3969 | 2529 | JavaCallArguments args; |
twisti@3969 | 2530 | args.push_oop(caller->java_mirror()); |
twisti@3969 | 2531 | args.push_oop(bsm()); |
twisti@3969 | 2532 | args.push_oop(method_name()); |
twisti@3969 | 2533 | args.push_oop(method_type()); |
jrose@1862 | 2534 | args.push_oop(info()); |
twisti@3969 | 2535 | args.push_oop(appendix_box); |
jrose@1161 | 2536 | JavaValue result(T_OBJECT); |
jrose@1161 | 2537 | JavaCalls::call_static(&result, |
jrose@1862 | 2538 | SystemDictionary::MethodHandleNatives_klass(), |
twisti@3969 | 2539 | vmSymbols::linkCallSite_name(), |
twisti@3969 | 2540 | vmSymbols::linkCallSite_signature(), |
jrose@1161 | 2541 | &args, CHECK_(empty)); |
twisti@3969 | 2542 | Handle mname(THREAD, (oop) result.get_jobject()); |
twisti@4133 | 2543 | (*method_type_result) = method_type; |
coleenp@4304 | 2544 | return unpack_method_and_appendix(mname, caller, appendix_box, appendix_result, THREAD); |
jrose@1161 | 2545 | } |
jrose@1161 | 2546 | |
duke@435 | 2547 | // Since the identity hash code for symbols changes when the symbols are |
duke@435 | 2548 | // moved from the regular perm gen (hash in the mark word) to the shared |
duke@435 | 2549 | // spaces (hash is the address), the classes loaded into the dictionary |
duke@435 | 2550 | // may be in the wrong buckets. |
duke@435 | 2551 | |
duke@435 | 2552 | void SystemDictionary::reorder_dictionary() { |
duke@435 | 2553 | dictionary()->reorder_dictionary(); |
duke@435 | 2554 | } |
duke@435 | 2555 | |
duke@435 | 2556 | |
duke@435 | 2557 | void SystemDictionary::copy_buckets(char** top, char* end) { |
duke@435 | 2558 | dictionary()->copy_buckets(top, end); |
duke@435 | 2559 | } |
duke@435 | 2560 | |
duke@435 | 2561 | |
duke@435 | 2562 | void SystemDictionary::copy_table(char** top, char* end) { |
duke@435 | 2563 | dictionary()->copy_table(top, end); |
duke@435 | 2564 | } |
duke@435 | 2565 | |
duke@435 | 2566 | |
duke@435 | 2567 | void SystemDictionary::reverse() { |
duke@435 | 2568 | dictionary()->reverse(); |
duke@435 | 2569 | } |
duke@435 | 2570 | |
duke@435 | 2571 | int SystemDictionary::number_of_classes() { |
duke@435 | 2572 | return dictionary()->number_of_entries(); |
duke@435 | 2573 | } |
duke@435 | 2574 | |
duke@435 | 2575 | |
duke@435 | 2576 | // ---------------------------------------------------------------------------- |
duke@435 | 2577 | #ifndef PRODUCT |
duke@435 | 2578 | |
duke@435 | 2579 | void SystemDictionary::print() { |
duke@435 | 2580 | dictionary()->print(); |
duke@435 | 2581 | |
duke@435 | 2582 | // Placeholders |
duke@435 | 2583 | GCMutexLocker mu(SystemDictionary_lock); |
duke@435 | 2584 | placeholders()->print(); |
duke@435 | 2585 | |
duke@435 | 2586 | // loader constraints - print under SD_lock |
duke@435 | 2587 | constraints()->print(); |
duke@435 | 2588 | } |
duke@435 | 2589 | |
duke@435 | 2590 | #endif |
duke@435 | 2591 | |
duke@435 | 2592 | void SystemDictionary::verify() { |
duke@435 | 2593 | guarantee(dictionary() != NULL, "Verify of system dictionary failed"); |
duke@435 | 2594 | guarantee(constraints() != NULL, |
duke@435 | 2595 | "Verify of loader constraints failed"); |
duke@435 | 2596 | guarantee(dictionary()->number_of_entries() >= 0 && |
duke@435 | 2597 | placeholders()->number_of_entries() >= 0, |
duke@435 | 2598 | "Verify of system dictionary failed"); |
duke@435 | 2599 | |
duke@435 | 2600 | // Verify dictionary |
duke@435 | 2601 | dictionary()->verify(); |
duke@435 | 2602 | |
duke@435 | 2603 | GCMutexLocker mu(SystemDictionary_lock); |
duke@435 | 2604 | placeholders()->verify(); |
duke@435 | 2605 | |
duke@435 | 2606 | // Verify constraint table |
duke@435 | 2607 | guarantee(constraints() != NULL, "Verify of loader constraints failed"); |
tonyp@1693 | 2608 | constraints()->verify(dictionary(), placeholders()); |
duke@435 | 2609 | } |
duke@435 | 2610 | |
duke@435 | 2611 | |
coleenp@4037 | 2612 | void SystemDictionary::verify_obj_klass_present(Symbol* class_name, |
coleenp@4037 | 2613 | ClassLoaderData* loader_data) { |
duke@435 | 2614 | GCMutexLocker mu(SystemDictionary_lock); |
coleenp@2497 | 2615 | Symbol* name; |
coleenp@2497 | 2616 | |
coleenp@4037 | 2617 | Klass* probe = find_class(class_name, loader_data); |
duke@435 | 2618 | if (probe == NULL) { |
duke@435 | 2619 | probe = SystemDictionary::find_shared_class(class_name); |
coleenp@2497 | 2620 | if (probe == NULL) { |
coleenp@4037 | 2621 | name = find_placeholder(class_name, loader_data); |
coleenp@2497 | 2622 | } |
duke@435 | 2623 | } |
coleenp@2497 | 2624 | guarantee(probe != NULL || name != NULL, |
coleenp@2497 | 2625 | "Loaded klasses should be in SystemDictionary"); |
duke@435 | 2626 | } |
duke@435 | 2627 | |
sla@5237 | 2628 | // utility function for class load event |
sla@5237 | 2629 | void SystemDictionary::post_class_load_event(TracingTime start_time, |
sla@5237 | 2630 | instanceKlassHandle k, |
sla@5237 | 2631 | Handle initiating_loader) { |
sla@5237 | 2632 | #if INCLUDE_TRACE |
sla@5237 | 2633 | EventClassLoad event(UNTIMED); |
sla@5237 | 2634 | if (event.should_commit()) { |
sla@5237 | 2635 | event.set_endtime(Tracing::time()); |
sla@5237 | 2636 | event.set_starttime(start_time); |
sla@5237 | 2637 | event.set_loadedClass(k()); |
sla@5237 | 2638 | oop defining_class_loader = k->class_loader(); |
sla@5237 | 2639 | event.set_definingClassLoader(defining_class_loader != NULL ? |
sla@5237 | 2640 | defining_class_loader->klass() : (Klass*)NULL); |
sla@5237 | 2641 | oop class_loader = initiating_loader.is_null() ? (oop)NULL : initiating_loader(); |
sla@5237 | 2642 | event.set_initiatingClassLoader(class_loader != NULL ? |
sla@5237 | 2643 | class_loader->klass() : (Klass*)NULL); |
sla@5237 | 2644 | event.commit(); |
sla@5237 | 2645 | } |
sla@5237 | 2646 | #endif /* INCLUDE_TRACE */ |
sla@5237 | 2647 | } |
sla@5237 | 2648 | |
duke@435 | 2649 | #ifndef PRODUCT |
duke@435 | 2650 | |
duke@435 | 2651 | // statistics code |
duke@435 | 2652 | class ClassStatistics: AllStatic { |
duke@435 | 2653 | private: |
duke@435 | 2654 | static int nclasses; // number of classes |
duke@435 | 2655 | static int nmethods; // number of methods |
duke@435 | 2656 | static int nmethoddata; // number of methodData |
duke@435 | 2657 | static int class_size; // size of class objects in words |
duke@435 | 2658 | static int method_size; // size of method objects in words |
duke@435 | 2659 | static int debug_size; // size of debug info in methods |
duke@435 | 2660 | static int methoddata_size; // size of methodData objects in words |
duke@435 | 2661 | |
coleenp@4037 | 2662 | static void do_class(Klass* k) { |
duke@435 | 2663 | nclasses++; |
duke@435 | 2664 | class_size += k->size(); |
coleenp@4037 | 2665 | if (k->oop_is_instance()) { |
coleenp@4037 | 2666 | InstanceKlass* ik = (InstanceKlass*)k; |
duke@435 | 2667 | class_size += ik->methods()->size(); |
duke@435 | 2668 | class_size += ik->constants()->size(); |
duke@435 | 2669 | class_size += ik->local_interfaces()->size(); |
duke@435 | 2670 | class_size += ik->transitive_interfaces()->size(); |
duke@435 | 2671 | // We do not have to count implementors, since we only store one! |
coleenp@4037 | 2672 | // SSS: How should these be accounted now that they have moved? |
coleenp@4037 | 2673 | // class_size += ik->fields()->length(); |
duke@435 | 2674 | } |
duke@435 | 2675 | } |
duke@435 | 2676 | |
coleenp@4037 | 2677 | static void do_method(Method* m) { |
duke@435 | 2678 | nmethods++; |
duke@435 | 2679 | method_size += m->size(); |
duke@435 | 2680 | // class loader uses same objArray for empty vectors, so don't count these |
duke@435 | 2681 | if (m->has_stackmap_table()) { |
duke@435 | 2682 | method_size += m->stackmap_data()->size(); |
duke@435 | 2683 | } |
duke@435 | 2684 | |
coleenp@4037 | 2685 | MethodData* mdo = m->method_data(); |
duke@435 | 2686 | if (mdo != NULL) { |
duke@435 | 2687 | nmethoddata++; |
duke@435 | 2688 | methoddata_size += mdo->size(); |
duke@435 | 2689 | } |
duke@435 | 2690 | } |
duke@435 | 2691 | |
duke@435 | 2692 | public: |
duke@435 | 2693 | static void print() { |
duke@435 | 2694 | SystemDictionary::classes_do(do_class); |
duke@435 | 2695 | SystemDictionary::methods_do(do_method); |
duke@435 | 2696 | tty->print_cr("Class statistics:"); |
duke@435 | 2697 | tty->print_cr("%d classes (%d bytes)", nclasses, class_size * oopSize); |
duke@435 | 2698 | tty->print_cr("%d methods (%d bytes = %d base + %d debug info)", nmethods, |
duke@435 | 2699 | (method_size + debug_size) * oopSize, method_size * oopSize, debug_size * oopSize); |
duke@435 | 2700 | tty->print_cr("%d methoddata (%d bytes)", nmethoddata, methoddata_size * oopSize); |
duke@435 | 2701 | } |
duke@435 | 2702 | }; |
duke@435 | 2703 | |
duke@435 | 2704 | |
duke@435 | 2705 | int ClassStatistics::nclasses = 0; |
duke@435 | 2706 | int ClassStatistics::nmethods = 0; |
duke@435 | 2707 | int ClassStatistics::nmethoddata = 0; |
duke@435 | 2708 | int ClassStatistics::class_size = 0; |
duke@435 | 2709 | int ClassStatistics::method_size = 0; |
duke@435 | 2710 | int ClassStatistics::debug_size = 0; |
duke@435 | 2711 | int ClassStatistics::methoddata_size = 0; |
duke@435 | 2712 | |
duke@435 | 2713 | void SystemDictionary::print_class_statistics() { |
duke@435 | 2714 | ResourceMark rm; |
duke@435 | 2715 | ClassStatistics::print(); |
duke@435 | 2716 | } |
duke@435 | 2717 | |
duke@435 | 2718 | |
duke@435 | 2719 | class MethodStatistics: AllStatic { |
duke@435 | 2720 | public: |
duke@435 | 2721 | enum { |
duke@435 | 2722 | max_parameter_size = 10 |
duke@435 | 2723 | }; |
duke@435 | 2724 | private: |
duke@435 | 2725 | |
duke@435 | 2726 | static int _number_of_methods; |
duke@435 | 2727 | static int _number_of_final_methods; |
duke@435 | 2728 | static int _number_of_static_methods; |
duke@435 | 2729 | static int _number_of_native_methods; |
duke@435 | 2730 | static int _number_of_synchronized_methods; |
duke@435 | 2731 | static int _number_of_profiled_methods; |
duke@435 | 2732 | static int _number_of_bytecodes; |
duke@435 | 2733 | static int _parameter_size_profile[max_parameter_size]; |
duke@435 | 2734 | static int _bytecodes_profile[Bytecodes::number_of_java_codes]; |
duke@435 | 2735 | |
duke@435 | 2736 | static void initialize() { |
duke@435 | 2737 | _number_of_methods = 0; |
duke@435 | 2738 | _number_of_final_methods = 0; |
duke@435 | 2739 | _number_of_static_methods = 0; |
duke@435 | 2740 | _number_of_native_methods = 0; |
duke@435 | 2741 | _number_of_synchronized_methods = 0; |
duke@435 | 2742 | _number_of_profiled_methods = 0; |
duke@435 | 2743 | _number_of_bytecodes = 0; |
duke@435 | 2744 | for (int i = 0; i < max_parameter_size ; i++) _parameter_size_profile[i] = 0; |
duke@435 | 2745 | for (int j = 0; j < Bytecodes::number_of_java_codes; j++) _bytecodes_profile [j] = 0; |
duke@435 | 2746 | }; |
duke@435 | 2747 | |
coleenp@4037 | 2748 | static void do_method(Method* m) { |
duke@435 | 2749 | _number_of_methods++; |
duke@435 | 2750 | // collect flag info |
duke@435 | 2751 | if (m->is_final() ) _number_of_final_methods++; |
duke@435 | 2752 | if (m->is_static() ) _number_of_static_methods++; |
duke@435 | 2753 | if (m->is_native() ) _number_of_native_methods++; |
duke@435 | 2754 | if (m->is_synchronized()) _number_of_synchronized_methods++; |
duke@435 | 2755 | if (m->method_data() != NULL) _number_of_profiled_methods++; |
duke@435 | 2756 | // collect parameter size info (add one for receiver, if any) |
duke@435 | 2757 | _parameter_size_profile[MIN2(m->size_of_parameters() + (m->is_static() ? 0 : 1), max_parameter_size - 1)]++; |
duke@435 | 2758 | // collect bytecodes info |
duke@435 | 2759 | { |
duke@435 | 2760 | Thread *thread = Thread::current(); |
duke@435 | 2761 | HandleMark hm(thread); |
duke@435 | 2762 | BytecodeStream s(methodHandle(thread, m)); |
duke@435 | 2763 | Bytecodes::Code c; |
duke@435 | 2764 | while ((c = s.next()) >= 0) { |
duke@435 | 2765 | _number_of_bytecodes++; |
duke@435 | 2766 | _bytecodes_profile[c]++; |
duke@435 | 2767 | } |
duke@435 | 2768 | } |
duke@435 | 2769 | } |
duke@435 | 2770 | |
duke@435 | 2771 | public: |
duke@435 | 2772 | static void print() { |
duke@435 | 2773 | initialize(); |
duke@435 | 2774 | SystemDictionary::methods_do(do_method); |
duke@435 | 2775 | // generate output |
duke@435 | 2776 | tty->cr(); |
duke@435 | 2777 | tty->print_cr("Method statistics (static):"); |
duke@435 | 2778 | // flag distribution |
duke@435 | 2779 | tty->cr(); |
duke@435 | 2780 | tty->print_cr("%6d final methods %6.1f%%", _number_of_final_methods , _number_of_final_methods * 100.0F / _number_of_methods); |
duke@435 | 2781 | tty->print_cr("%6d static methods %6.1f%%", _number_of_static_methods , _number_of_static_methods * 100.0F / _number_of_methods); |
duke@435 | 2782 | tty->print_cr("%6d native methods %6.1f%%", _number_of_native_methods , _number_of_native_methods * 100.0F / _number_of_methods); |
duke@435 | 2783 | tty->print_cr("%6d synchronized methods %6.1f%%", _number_of_synchronized_methods, _number_of_synchronized_methods * 100.0F / _number_of_methods); |
duke@435 | 2784 | tty->print_cr("%6d profiled methods %6.1f%%", _number_of_profiled_methods, _number_of_profiled_methods * 100.0F / _number_of_methods); |
duke@435 | 2785 | // parameter size profile |
duke@435 | 2786 | tty->cr(); |
duke@435 | 2787 | { int tot = 0; |
duke@435 | 2788 | int avg = 0; |
duke@435 | 2789 | for (int i = 0; i < max_parameter_size; i++) { |
duke@435 | 2790 | int n = _parameter_size_profile[i]; |
duke@435 | 2791 | tot += n; |
duke@435 | 2792 | avg += n*i; |
duke@435 | 2793 | tty->print_cr("parameter size = %1d: %6d methods %5.1f%%", i, n, n * 100.0F / _number_of_methods); |
duke@435 | 2794 | } |
duke@435 | 2795 | assert(tot == _number_of_methods, "should be the same"); |
duke@435 | 2796 | tty->print_cr(" %6d methods 100.0%%", _number_of_methods); |
duke@435 | 2797 | tty->print_cr("(average parameter size = %3.1f including receiver, if any)", (float)avg / _number_of_methods); |
duke@435 | 2798 | } |
duke@435 | 2799 | // bytecodes profile |
duke@435 | 2800 | tty->cr(); |
duke@435 | 2801 | { int tot = 0; |
duke@435 | 2802 | for (int i = 0; i < Bytecodes::number_of_java_codes; i++) { |
duke@435 | 2803 | if (Bytecodes::is_defined(i)) { |
duke@435 | 2804 | Bytecodes::Code c = Bytecodes::cast(i); |
duke@435 | 2805 | int n = _bytecodes_profile[c]; |
duke@435 | 2806 | tot += n; |
duke@435 | 2807 | tty->print_cr("%9d %7.3f%% %s", n, n * 100.0F / _number_of_bytecodes, Bytecodes::name(c)); |
duke@435 | 2808 | } |
duke@435 | 2809 | } |
duke@435 | 2810 | assert(tot == _number_of_bytecodes, "should be the same"); |
duke@435 | 2811 | tty->print_cr("%9d 100.000%%", _number_of_bytecodes); |
duke@435 | 2812 | } |
duke@435 | 2813 | tty->cr(); |
duke@435 | 2814 | } |
duke@435 | 2815 | }; |
duke@435 | 2816 | |
duke@435 | 2817 | int MethodStatistics::_number_of_methods; |
duke@435 | 2818 | int MethodStatistics::_number_of_final_methods; |
duke@435 | 2819 | int MethodStatistics::_number_of_static_methods; |
duke@435 | 2820 | int MethodStatistics::_number_of_native_methods; |
duke@435 | 2821 | int MethodStatistics::_number_of_synchronized_methods; |
duke@435 | 2822 | int MethodStatistics::_number_of_profiled_methods; |
duke@435 | 2823 | int MethodStatistics::_number_of_bytecodes; |
duke@435 | 2824 | int MethodStatistics::_parameter_size_profile[MethodStatistics::max_parameter_size]; |
duke@435 | 2825 | int MethodStatistics::_bytecodes_profile[Bytecodes::number_of_java_codes]; |
duke@435 | 2826 | |
duke@435 | 2827 | |
duke@435 | 2828 | void SystemDictionary::print_method_statistics() { |
duke@435 | 2829 | MethodStatistics::print(); |
duke@435 | 2830 | } |
duke@435 | 2831 | |
duke@435 | 2832 | #endif // PRODUCT |