Mercurial > hg > truffle
annotate src/share/vm/classfile/systemDictionary.cpp @ 2244:4f26f535a225
6354181: nsk.logging.stress.threads.scmhml001 fails assertion in "src/share/vm/oops/instanceKlass.cpp, 111"
Reviewed-by: jrose, acorn
| author | never |
|---|---|
| date | Mon, 31 Jan 2011 17:48:21 -0800 |
| parents | 3582bf76420e |
| children | 2ab52cda08e5 72dee110246f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1903 | 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/dictionary.hpp" | |
| 27 #include "classfile/javaClasses.hpp" | |
| 28 #include "classfile/loaderConstraints.hpp" | |
| 29 #include "classfile/placeholders.hpp" | |
| 30 #include "classfile/resolutionErrors.hpp" | |
| 31 #include "classfile/systemDictionary.hpp" | |
| 32 #include "classfile/vmSymbols.hpp" | |
| 33 #include "interpreter/bytecodeStream.hpp" | |
| 34 #include "interpreter/interpreter.hpp" | |
| 35 #include "memory/gcLocker.hpp" | |
| 36 #include "memory/oopFactory.hpp" | |
| 37 #include "oops/instanceKlass.hpp" | |
| 38 #include "oops/instanceRefKlass.hpp" | |
| 39 #include "oops/klass.inline.hpp" | |
| 40 #include "oops/methodDataOop.hpp" | |
| 41 #include "oops/objArrayKlass.hpp" | |
| 42 #include "oops/oop.inline.hpp" | |
| 43 #include "oops/oop.inline2.hpp" | |
| 44 #include "oops/typeArrayKlass.hpp" | |
| 45 #include "prims/jvmtiEnvBase.hpp" | |
| 46 #include "prims/methodHandles.hpp" | |
| 47 #include "runtime/biasedLocking.hpp" | |
| 48 #include "runtime/fieldType.hpp" | |
| 49 #include "runtime/handles.inline.hpp" | |
| 50 #include "runtime/java.hpp" | |
| 51 #include "runtime/javaCalls.hpp" | |
| 52 #include "runtime/mutexLocker.hpp" | |
| 53 #include "runtime/signature.hpp" | |
| 54 #include "services/classLoadingService.hpp" | |
| 55 #include "services/threadService.hpp" | |
| 0 | 56 |
| 57 | |
| 1903 | 58 Dictionary* SystemDictionary::_dictionary = NULL; |
| 59 PlaceholderTable* SystemDictionary::_placeholders = NULL; | |
| 60 Dictionary* SystemDictionary::_shared_dictionary = NULL; | |
| 61 LoaderConstraintTable* SystemDictionary::_loader_constraints = NULL; | |
| 62 ResolutionErrorTable* SystemDictionary::_resolution_errors = NULL; | |
| 63 SymbolPropertyTable* SystemDictionary::_invoke_method_table = NULL; | |
| 0 | 64 |
| 65 | |
| 66 int SystemDictionary::_number_of_modifications = 0; | |
| 67 | |
| 68 oop SystemDictionary::_system_loader_lock_obj = NULL; | |
| 69 | |
|
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70 klassOop SystemDictionary::_well_known_klasses[SystemDictionary::WKID_LIMIT] |
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71 = { NULL /*, NULL...*/ }; |
| 0 | 72 |
| 73 klassOop SystemDictionary::_box_klasses[T_VOID+1] = { NULL /*, NULL...*/ }; | |
| 74 | |
| 75 oop SystemDictionary::_java_system_loader = NULL; | |
| 76 | |
| 77 bool SystemDictionary::_has_loadClassInternal = false; | |
| 78 bool SystemDictionary::_has_checkPackageAccess = false; | |
| 79 | |
| 80 // lazily initialized klass variables | |
| 81 volatile klassOop SystemDictionary::_abstract_ownable_synchronizer_klass = NULL; | |
| 82 | |
| 83 | |
| 84 // ---------------------------------------------------------------------------- | |
| 85 // Java-level SystemLoader | |
| 86 | |
| 87 oop SystemDictionary::java_system_loader() { | |
| 88 return _java_system_loader; | |
| 89 } | |
| 90 | |
| 91 void SystemDictionary::compute_java_system_loader(TRAPS) { | |
| 1142 | 92 KlassHandle system_klass(THREAD, WK_KLASS(ClassLoader_klass)); |
| 0 | 93 JavaValue result(T_OBJECT); |
| 94 JavaCalls::call_static(&result, | |
| 1142 | 95 KlassHandle(THREAD, WK_KLASS(ClassLoader_klass)), |
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96 vmSymbols::getSystemClassLoader_name(), |
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97 vmSymbols::void_classloader_signature(), |
| 0 | 98 CHECK); |
| 99 | |
| 100 _java_system_loader = (oop)result.get_jobject(); | |
| 101 } | |
| 102 | |
| 103 | |
| 104 // ---------------------------------------------------------------------------- | |
| 105 // debugging | |
| 106 | |
| 107 #ifdef ASSERT | |
| 108 | |
| 109 // return true if class_name contains no '.' (internal format is '/') | |
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110 bool SystemDictionary::is_internal_format(Symbol* class_name) { |
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111 if (class_name != NULL) { |
| 0 | 112 ResourceMark rm; |
| 113 char* name = class_name->as_C_string(); | |
| 114 return strchr(name, '.') == NULL; | |
| 115 } else { | |
| 116 return true; | |
| 117 } | |
| 118 } | |
| 119 | |
| 120 #endif | |
| 121 | |
| 122 // ---------------------------------------------------------------------------- | |
| 514 | 123 // Parallel class loading check |
| 124 | |
| 125 bool SystemDictionary::is_parallelCapable(Handle class_loader) { | |
| 126 if (UnsyncloadClass || class_loader.is_null()) return true; | |
| 127 if (AlwaysLockClassLoader) return false; | |
| 128 return java_lang_Class::parallelCapable(class_loader()); | |
| 129 } | |
| 130 // ---------------------------------------------------------------------------- | |
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131 // ParallelDefineClass flag does not apply to bootclass loader |
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132 bool SystemDictionary::is_parallelDefine(Handle class_loader) { |
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133 if (class_loader.is_null()) return false; |
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134 if (AllowParallelDefineClass && java_lang_Class::parallelCapable(class_loader())) { |
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135 return true; |
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136 } |
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137 return false; |
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138 } |
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139 // ---------------------------------------------------------------------------- |
| 0 | 140 // Resolving of classes |
| 141 | |
| 142 // Forwards to resolve_or_null | |
| 143 | |
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144 klassOop SystemDictionary::resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS) { |
| 0 | 145 klassOop klass = resolve_or_null(class_name, class_loader, protection_domain, THREAD); |
| 146 if (HAS_PENDING_EXCEPTION || klass == NULL) { | |
| 147 KlassHandle k_h(THREAD, klass); | |
| 148 // can return a null klass | |
| 149 klass = handle_resolution_exception(class_name, class_loader, protection_domain, throw_error, k_h, THREAD); | |
| 150 } | |
| 151 return klass; | |
| 152 } | |
| 153 | |
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154 klassOop SystemDictionary::handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS) { |
| 0 | 155 if (HAS_PENDING_EXCEPTION) { |
| 156 // If we have a pending exception we forward it to the caller, unless throw_error is true, | |
| 157 // in which case we have to check whether the pending exception is a ClassNotFoundException, | |
| 158 // and if so convert it to a NoClassDefFoundError | |
| 159 // And chain the original ClassNotFoundException | |
| 1142 | 160 if (throw_error && PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass())) { |
| 0 | 161 ResourceMark rm(THREAD); |
| 162 assert(klass_h() == NULL, "Should not have result with exception pending"); | |
| 163 Handle e(THREAD, PENDING_EXCEPTION); | |
| 164 CLEAR_PENDING_EXCEPTION; | |
| 165 THROW_MSG_CAUSE_0(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string(), e); | |
| 166 } else { | |
| 167 return NULL; | |
| 168 } | |
| 169 } | |
| 170 // Class not found, throw appropriate error or exception depending on value of throw_error | |
| 171 if (klass_h() == NULL) { | |
| 172 ResourceMark rm(THREAD); | |
| 173 if (throw_error) { | |
| 174 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string()); | |
| 175 } else { | |
| 176 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), class_name->as_C_string()); | |
| 177 } | |
| 178 } | |
| 179 return (klassOop)klass_h(); | |
| 180 } | |
| 181 | |
| 182 | |
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183 klassOop SystemDictionary::resolve_or_fail(Symbol* class_name, |
| 0 | 184 bool throw_error, TRAPS) |
| 185 { | |
| 186 return resolve_or_fail(class_name, Handle(), Handle(), throw_error, THREAD); | |
| 187 } | |
| 188 | |
| 189 | |
| 190 // Forwards to resolve_instance_class_or_null | |
| 191 | |
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192 klassOop SystemDictionary::resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS) { |
| 0 | 193 assert(!THREAD->is_Compiler_thread(), "Can not load classes with the Compiler thread"); |
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194 if (FieldType::is_array(class_name)) { |
| 0 | 195 return resolve_array_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); |
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196 } else if (FieldType::is_obj(class_name)) { |
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197 ResourceMark rm(THREAD); |
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198 // Ignore wrapping L and ;. |
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199 TempNewSymbol name = SymbolTable::new_symbol(class_name->as_C_string() + 1, |
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200 class_name->utf8_length() - 2, CHECK_NULL); |
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201 return resolve_instance_class_or_null(name, class_loader, protection_domain, CHECK_NULL); |
| 0 | 202 } else { |
| 203 return resolve_instance_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); | |
| 204 } | |
| 205 } | |
| 206 | |
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207 klassOop SystemDictionary::resolve_or_null(Symbol* class_name, TRAPS) { |
| 0 | 208 return resolve_or_null(class_name, Handle(), Handle(), THREAD); |
| 209 } | |
| 210 | |
| 211 // Forwards to resolve_instance_class_or_null | |
| 212 | |
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213 klassOop SystemDictionary::resolve_array_class_or_null(Symbol* class_name, |
| 0 | 214 Handle class_loader, |
| 215 Handle protection_domain, | |
| 216 TRAPS) { | |
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217 assert(FieldType::is_array(class_name), "must be array"); |
| 0 | 218 klassOop k = NULL; |
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219 FieldArrayInfo fd; |
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220 // dimension and object_key in FieldArrayInfo are assigned as a side-effect |
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221 // of this call |
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222 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_NULL); |
| 0 | 223 if (t == T_OBJECT) { |
| 224 // naked oop "k" is OK here -- we assign back into it | |
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225 k = SystemDictionary::resolve_instance_class_or_null(fd.object_key(), |
| 0 | 226 class_loader, |
| 227 protection_domain, | |
| 228 CHECK_NULL); | |
| 229 if (k != NULL) { | |
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230 k = Klass::cast(k)->array_klass(fd.dimension(), CHECK_NULL); |
| 0 | 231 } |
| 232 } else { | |
| 233 k = Universe::typeArrayKlassObj(t); | |
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234 k = typeArrayKlass::cast(k)->array_klass(fd.dimension(), CHECK_NULL); |
| 0 | 235 } |
| 236 return k; | |
| 237 } | |
| 238 | |
| 239 | |
| 240 // Must be called for any super-class or super-interface resolution | |
| 241 // during class definition to allow class circularity checking | |
| 242 // super-interface callers: | |
| 243 // parse_interfaces - for defineClass & jvmtiRedefineClasses | |
| 244 // super-class callers: | |
| 245 // ClassFileParser - for defineClass & jvmtiRedefineClasses | |
| 246 // load_shared_class - while loading a class from shared archive | |
| 514 | 247 // resolve_instance_class_or_null: |
| 248 // via: handle_parallel_super_load | |
| 0 | 249 // when resolving a class that has an existing placeholder with |
| 250 // a saved superclass [i.e. a defineClass is currently in progress] | |
| 251 // if another thread is trying to resolve the class, it must do | |
| 252 // super-class checks on its own thread to catch class circularity | |
| 253 // This last call is critical in class circularity checking for cases | |
| 254 // where classloading is delegated to different threads and the | |
| 255 // classloader lock is released. | |
| 256 // Take the case: Base->Super->Base | |
| 257 // 1. If thread T1 tries to do a defineClass of class Base | |
| 258 // resolve_super_or_fail creates placeholder: T1, Base (super Super) | |
| 259 // 2. resolve_instance_class_or_null does not find SD or placeholder for Super | |
| 260 // so it tries to load Super | |
| 261 // 3. If we load the class internally, or user classloader uses same thread | |
| 262 // loadClassFromxxx or defineClass via parseClassFile Super ... | |
| 263 // 3.1 resolve_super_or_fail creates placeholder: T1, Super (super Base) | |
| 264 // 3.3 resolve_instance_class_or_null Base, finds placeholder for Base | |
| 265 // 3.4 calls resolve_super_or_fail Base | |
| 266 // 3.5 finds T1,Base -> throws class circularity | |
| 267 //OR 4. If T2 tries to resolve Super via defineClass Super ... | |
| 268 // 4.1 resolve_super_or_fail creates placeholder: T2, Super (super Base) | |
| 269 // 4.2 resolve_instance_class_or_null Base, finds placeholder for Base (super Super) | |
| 270 // 4.3 calls resolve_super_or_fail Super in parallel on own thread T2 | |
| 271 // 4.4 finds T2, Super -> throws class circularity | |
| 272 // Must be called, even if superclass is null, since this is | |
| 273 // where the placeholder entry is created which claims this | |
| 274 // thread is loading this class/classloader. | |
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275 klassOop SystemDictionary::resolve_super_or_fail(Symbol* child_name, |
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276 Symbol* class_name, |
| 0 | 277 Handle class_loader, |
| 278 Handle protection_domain, | |
| 279 bool is_superclass, | |
| 280 TRAPS) { | |
| 281 | |
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282 // Try to get one of the well-known klasses. |
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283 // They are trusted, and do not participate in circularities. |
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284 if (LinkWellKnownClasses) { |
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285 klassOop k = find_well_known_klass(class_name); |
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286 if (k != NULL) { |
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287 return k; |
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288 } |
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289 } |
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290 |
| 0 | 291 // Double-check, if child class is already loaded, just return super-class,interface |
| 292 // Don't add a placedholder if already loaded, i.e. already in system dictionary | |
| 293 // Make sure there's a placeholder for the *child* before resolving. | |
| 294 // Used as a claim that this thread is currently loading superclass/classloader | |
| 295 // Used here for ClassCircularity checks and also for heap verification | |
| 296 // (every instanceKlass in the heap needs to be in the system dictionary | |
| 297 // or have a placeholder). | |
| 298 // Must check ClassCircularity before checking if super class is already loaded | |
| 299 // | |
| 300 // We might not already have a placeholder if this child_name was | |
| 301 // first seen via resolve_from_stream (jni_DefineClass or JVM_DefineClass); | |
| 302 // the name of the class might not be known until the stream is actually | |
| 303 // parsed. | |
| 304 // Bugs 4643874, 4715493 | |
| 305 // compute_hash can have a safepoint | |
| 306 | |
| 307 unsigned int d_hash = dictionary()->compute_hash(child_name, class_loader); | |
| 308 int d_index = dictionary()->hash_to_index(d_hash); | |
| 309 unsigned int p_hash = placeholders()->compute_hash(child_name, class_loader); | |
| 310 int p_index = placeholders()->hash_to_index(p_hash); | |
| 311 // can't throw error holding a lock | |
| 312 bool child_already_loaded = false; | |
| 313 bool throw_circularity_error = false; | |
| 314 { | |
| 315 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 316 klassOop childk = find_class(d_index, d_hash, child_name, class_loader); | |
| 317 klassOop quicksuperk; | |
| 318 // to support // loading: if child done loading, just return superclass | |
| 319 // if class_name, & class_loader don't match: | |
| 320 // if initial define, SD update will give LinkageError | |
| 321 // if redefine: compare_class_versions will give HIERARCHY_CHANGED | |
| 322 // so we don't throw an exception here. | |
| 323 // see: nsk redefclass014 & java.lang.instrument Instrument032 | |
| 324 if ((childk != NULL ) && (is_superclass) && | |
| 325 ((quicksuperk = instanceKlass::cast(childk)->super()) != NULL) && | |
| 326 | |
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327 ((Klass::cast(quicksuperk)->name() == class_name) && |
| 0 | 328 (Klass::cast(quicksuperk)->class_loader() == class_loader()))) { |
| 329 return quicksuperk; | |
| 330 } else { | |
| 331 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, class_loader); | |
| 332 if (probe && probe->check_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER)) { | |
| 333 throw_circularity_error = true; | |
| 334 } | |
| 514 | 335 } |
| 336 if (!throw_circularity_error) { | |
| 0 | 337 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, child_name, class_loader, PlaceholderTable::LOAD_SUPER, class_name, THREAD); |
| 338 } | |
| 339 } | |
| 340 if (throw_circularity_error) { | |
| 341 ResourceMark rm(THREAD); | |
| 342 THROW_MSG_0(vmSymbols::java_lang_ClassCircularityError(), child_name->as_C_string()); | |
| 343 } | |
| 344 | |
| 345 // java.lang.Object should have been found above | |
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346 assert(class_name != NULL, "null super class for resolving"); |
| 0 | 347 // Resolve the super class or interface, check results on return |
| 348 klassOop superk = NULL; | |
| 349 superk = SystemDictionary::resolve_or_null(class_name, | |
| 350 class_loader, | |
| 351 protection_domain, | |
| 352 THREAD); | |
| 353 | |
| 354 KlassHandle superk_h(THREAD, superk); | |
| 355 | |
| 356 // Note: clean up of placeholders currently in callers of | |
| 357 // resolve_super_or_fail - either at update_dictionary time | |
| 358 // or on error | |
| 359 { | |
| 360 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 361 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, class_loader); | |
| 362 if (probe != NULL) { | |
| 363 probe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER); | |
| 364 } | |
| 365 } | |
| 366 if (HAS_PENDING_EXCEPTION || superk_h() == NULL) { | |
| 367 // can null superk | |
| 368 superk_h = KlassHandle(THREAD, handle_resolution_exception(class_name, class_loader, protection_domain, true, superk_h, THREAD)); | |
| 369 } | |
| 370 | |
| 371 return superk_h(); | |
| 372 } | |
| 373 | |
| 374 void SystemDictionary::validate_protection_domain(instanceKlassHandle klass, | |
| 375 Handle class_loader, | |
| 376 Handle protection_domain, | |
| 377 TRAPS) { | |
| 378 if(!has_checkPackageAccess()) return; | |
| 379 | |
| 380 // Now we have to call back to java to check if the initating class has access | |
| 381 JavaValue result(T_VOID); | |
| 382 if (TraceProtectionDomainVerification) { | |
| 383 // Print out trace information | |
| 384 tty->print_cr("Checking package access"); | |
| 385 tty->print(" - class loader: "); class_loader()->print_value_on(tty); tty->cr(); | |
| 386 tty->print(" - protection domain: "); protection_domain()->print_value_on(tty); tty->cr(); | |
| 387 tty->print(" - loading: "); klass()->print_value_on(tty); tty->cr(); | |
| 388 } | |
| 389 | |
| 390 assert(class_loader() != NULL, "should not have non-null protection domain for null classloader"); | |
| 391 | |
| 1142 | 392 KlassHandle system_loader(THREAD, SystemDictionary::ClassLoader_klass()); |
| 0 | 393 JavaCalls::call_special(&result, |
| 394 class_loader, | |
| 395 system_loader, | |
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396 vmSymbols::checkPackageAccess_name(), |
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397 vmSymbols::class_protectiondomain_signature(), |
| 0 | 398 Handle(THREAD, klass->java_mirror()), |
| 399 protection_domain, | |
| 400 THREAD); | |
| 401 | |
| 402 if (TraceProtectionDomainVerification) { | |
| 403 if (HAS_PENDING_EXCEPTION) { | |
| 404 tty->print_cr(" -> DENIED !!!!!!!!!!!!!!!!!!!!!"); | |
| 405 } else { | |
| 406 tty->print_cr(" -> granted"); | |
| 407 } | |
| 408 tty->cr(); | |
| 409 } | |
| 410 | |
| 411 if (HAS_PENDING_EXCEPTION) return; | |
| 412 | |
| 413 // If no exception has been thrown, we have validated the protection domain | |
| 414 // Insert the protection domain of the initiating class into the set. | |
| 415 { | |
| 416 // We recalculate the entry here -- we've called out to java since | |
| 417 // the last time it was calculated. | |
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418 Symbol* kn = klass->name(); |
| 0 | 419 unsigned int d_hash = dictionary()->compute_hash(kn, class_loader); |
| 420 int d_index = dictionary()->hash_to_index(d_hash); | |
| 421 | |
| 422 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 423 { | |
| 424 // Note that we have an entry, and entries can be deleted only during GC, | |
| 425 // so we cannot allow GC to occur while we're holding this entry. | |
| 426 | |
| 427 // We're using a No_Safepoint_Verifier to catch any place where we | |
| 428 // might potentially do a GC at all. | |
| 429 // SystemDictionary::do_unloading() asserts that classes are only | |
| 430 // unloaded at a safepoint. | |
| 431 No_Safepoint_Verifier nosafepoint; | |
| 432 dictionary()->add_protection_domain(d_index, d_hash, klass, class_loader, | |
| 433 protection_domain, THREAD); | |
| 434 } | |
| 435 } | |
| 436 } | |
| 437 | |
| 438 // We only get here if this thread finds that another thread | |
| 439 // has already claimed the placeholder token for the current operation, | |
| 440 // but that other thread either never owned or gave up the | |
| 441 // object lock | |
| 442 // Waits on SystemDictionary_lock to indicate placeholder table updated | |
| 443 // On return, caller must recheck placeholder table state | |
| 444 // | |
| 445 // We only get here if | |
| 446 // 1) custom classLoader, i.e. not bootstrap classloader | |
| 447 // 2) UnsyncloadClass not set | |
| 448 // 3) custom classLoader has broken the class loader objectLock | |
| 449 // so another thread got here in parallel | |
| 450 // | |
| 451 // lockObject must be held. | |
| 452 // Complicated dance due to lock ordering: | |
| 453 // Must first release the classloader object lock to | |
| 454 // allow initial definer to complete the class definition | |
| 455 // and to avoid deadlock | |
| 456 // Reclaim classloader lock object with same original recursion count | |
| 457 // Must release SystemDictionary_lock after notify, since | |
| 458 // class loader lock must be claimed before SystemDictionary_lock | |
| 459 // to prevent deadlocks | |
| 460 // | |
| 461 // The notify allows applications that did an untimed wait() on | |
| 462 // the classloader object lock to not hang. | |
| 463 void SystemDictionary::double_lock_wait(Handle lockObject, TRAPS) { | |
| 464 assert_lock_strong(SystemDictionary_lock); | |
| 465 | |
| 466 bool calledholdinglock | |
| 467 = ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, lockObject); | |
| 468 assert(calledholdinglock,"must hold lock for notify"); | |
| 514 | 469 assert((!(lockObject() == _system_loader_lock_obj) && !is_parallelCapable(lockObject)), "unexpected double_lock_wait"); |
| 0 | 470 ObjectSynchronizer::notifyall(lockObject, THREAD); |
| 471 intptr_t recursions = ObjectSynchronizer::complete_exit(lockObject, THREAD); | |
| 472 SystemDictionary_lock->wait(); | |
| 473 SystemDictionary_lock->unlock(); | |
| 474 ObjectSynchronizer::reenter(lockObject, recursions, THREAD); | |
| 475 SystemDictionary_lock->lock(); | |
| 476 } | |
| 477 | |
| 478 // If the class in is in the placeholder table, class loading is in progress | |
| 479 // For cases where the application changes threads to load classes, it | |
| 480 // is critical to ClassCircularity detection that we try loading | |
| 481 // the superclass on the same thread internally, so we do parallel | |
| 482 // super class loading here. | |
| 483 // This also is critical in cases where the original thread gets stalled | |
| 484 // even in non-circularity situations. | |
| 485 // Note: only one thread can define the class, but multiple can resolve | |
| 486 // Note: must call resolve_super_or_fail even if null super - | |
| 514 | 487 // to force placeholder entry creation for this class for circularity detection |
| 0 | 488 // Caller must check for pending exception |
| 489 // Returns non-null klassOop if other thread has completed load | |
| 490 // and we are done, | |
| 491 // If return null klassOop and no pending exception, the caller must load the class | |
| 492 instanceKlassHandle SystemDictionary::handle_parallel_super_load( | |
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493 Symbol* name, Symbol* superclassname, Handle class_loader, |
| 0 | 494 Handle protection_domain, Handle lockObject, TRAPS) { |
| 495 | |
| 496 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
| 497 unsigned int d_hash = dictionary()->compute_hash(name, class_loader); | |
| 498 int d_index = dictionary()->hash_to_index(d_hash); | |
| 499 unsigned int p_hash = placeholders()->compute_hash(name, class_loader); | |
| 500 int p_index = placeholders()->hash_to_index(p_hash); | |
| 501 | |
| 502 // superk is not used, resolve_super called for circularity check only | |
| 503 // This code is reached in two situations. One if this thread | |
| 504 // is loading the same class twice (e.g. ClassCircularity, or | |
| 505 // java.lang.instrument). | |
| 506 // The second is if another thread started the resolve_super first | |
| 507 // and has not yet finished. | |
| 508 // In both cases the original caller will clean up the placeholder | |
| 509 // entry on error. | |
| 510 klassOop superk = SystemDictionary::resolve_super_or_fail(name, | |
| 511 superclassname, | |
| 512 class_loader, | |
| 513 protection_domain, | |
| 514 true, | |
| 515 CHECK_(nh)); | |
| 516 // We don't redefine the class, so we just need to clean up if there | |
| 517 // was not an error (don't want to modify any system dictionary | |
| 518 // data structures). | |
| 519 { | |
| 520 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 521 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
| 522 SystemDictionary_lock->notify_all(); | |
| 523 } | |
| 524 | |
| 514 | 525 // parallelCapable class loaders do NOT wait for parallel superclass loads to complete |
| 526 // Serial class loaders and bootstrap classloader do wait for superclass loads | |
| 527 if (!class_loader.is_null() && is_parallelCapable(class_loader)) { | |
| 0 | 528 MutexLocker mu(SystemDictionary_lock, THREAD); |
| 529 // Check if classloading completed while we were loading superclass or waiting | |
| 530 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 531 if (check != NULL) { | |
| 532 // Klass is already loaded, so just return it | |
| 533 return(instanceKlassHandle(THREAD, check)); | |
| 534 } else { | |
| 535 return nh; | |
| 536 } | |
| 537 } | |
| 538 | |
| 539 // must loop to both handle other placeholder updates | |
| 540 // and spurious notifications | |
| 541 bool super_load_in_progress = true; | |
| 542 PlaceholderEntry* placeholder; | |
| 543 while (super_load_in_progress) { | |
| 544 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 545 // Check if classloading completed while we were loading superclass or waiting | |
| 546 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 547 if (check != NULL) { | |
| 548 // Klass is already loaded, so just return it | |
| 549 return(instanceKlassHandle(THREAD, check)); | |
| 550 } else { | |
| 551 placeholder = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
| 552 if (placeholder && placeholder->super_load_in_progress() ){ | |
| 553 // Before UnsyncloadClass: | |
| 554 // We only get here if the application has released the | |
| 555 // classloader lock when another thread was in the middle of loading a | |
| 556 // superclass/superinterface for this class, and now | |
| 557 // this thread is also trying to load this class. | |
| 558 // To minimize surprises, the first thread that started to | |
| 559 // load a class should be the one to complete the loading | |
| 560 // with the classfile it initially expected. | |
| 561 // This logic has the current thread wait once it has done | |
| 562 // all the superclass/superinterface loading it can, until | |
| 563 // the original thread completes the class loading or fails | |
| 564 // If it completes we will use the resulting instanceKlass | |
| 565 // which we will find below in the systemDictionary. | |
| 566 // We also get here for parallel bootstrap classloader | |
| 567 if (class_loader.is_null()) { | |
| 568 SystemDictionary_lock->wait(); | |
| 569 } else { | |
| 570 double_lock_wait(lockObject, THREAD); | |
| 571 } | |
| 572 } else { | |
| 573 // If not in SD and not in PH, other thread's load must have failed | |
| 574 super_load_in_progress = false; | |
| 575 } | |
| 576 } | |
| 577 } | |
| 578 return (nh); | |
| 579 } | |
| 580 | |
| 581 | |
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582 klassOop SystemDictionary::resolve_instance_class_or_null(Symbol* name, Handle class_loader, Handle protection_domain, TRAPS) { |
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583 assert(name != NULL && !FieldType::is_array(name) && |
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584 !FieldType::is_obj(name), "invalid class name"); |
| 0 | 585 |
| 586 // UseNewReflection | |
| 587 // Fix for 4474172; see evaluation for more details | |
| 588 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); | |
| 589 | |
| 590 // Do lookup to see if class already exist and the protection domain | |
| 591 // has the right access | |
| 592 unsigned int d_hash = dictionary()->compute_hash(name, class_loader); | |
| 593 int d_index = dictionary()->hash_to_index(d_hash); | |
| 594 klassOop probe = dictionary()->find(d_index, d_hash, name, class_loader, | |
| 595 protection_domain, THREAD); | |
| 596 if (probe != NULL) return probe; | |
| 597 | |
| 598 | |
| 599 // Non-bootstrap class loaders will call out to class loader and | |
| 600 // define via jvm/jni_DefineClass which will acquire the | |
| 601 // class loader object lock to protect against multiple threads | |
| 602 // defining the class in parallel by accident. | |
| 603 // This lock must be acquired here so the waiter will find | |
| 604 // any successful result in the SystemDictionary and not attempt | |
| 605 // the define | |
| 514 | 606 // ParallelCapable Classloaders and the bootstrap classloader, |
| 0 | 607 // or all classloaders with UnsyncloadClass do not acquire lock here |
| 608 bool DoObjectLock = true; | |
| 514 | 609 if (is_parallelCapable(class_loader)) { |
| 0 | 610 DoObjectLock = false; |
| 611 } | |
| 612 | |
| 613 unsigned int p_hash = placeholders()->compute_hash(name, class_loader); | |
| 614 int p_index = placeholders()->hash_to_index(p_hash); | |
| 615 | |
| 616 // Class is not in SystemDictionary so we have to do loading. | |
| 617 // Make sure we are synchronized on the class loader before we proceed | |
| 618 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
| 619 check_loader_lock_contention(lockObject, THREAD); | |
| 620 ObjectLocker ol(lockObject, THREAD, DoObjectLock); | |
| 621 | |
| 622 // Check again (after locking) if class already exist in SystemDictionary | |
| 623 bool class_has_been_loaded = false; | |
| 624 bool super_load_in_progress = false; | |
| 625 bool havesupername = false; | |
| 626 instanceKlassHandle k; | |
| 627 PlaceholderEntry* placeholder; | |
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628 Symbol* superclassname = NULL; |
| 0 | 629 |
| 630 { | |
| 631 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 632 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 633 if (check != NULL) { | |
| 634 // Klass is already loaded, so just return it | |
| 635 class_has_been_loaded = true; | |
| 636 k = instanceKlassHandle(THREAD, check); | |
| 637 } else { | |
| 638 placeholder = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
| 639 if (placeholder && placeholder->super_load_in_progress()) { | |
| 640 super_load_in_progress = true; | |
| 641 if (placeholder->havesupername() == true) { | |
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642 superclassname = placeholder->supername(); |
| 0 | 643 havesupername = true; |
| 644 } | |
| 645 } | |
| 646 } | |
| 647 } | |
| 648 | |
| 649 // If the class in is in the placeholder table, class loading is in progress | |
| 650 if (super_load_in_progress && havesupername==true) { | |
| 651 k = SystemDictionary::handle_parallel_super_load(name, superclassname, | |
| 652 class_loader, protection_domain, lockObject, THREAD); | |
| 653 if (HAS_PENDING_EXCEPTION) { | |
| 654 return NULL; | |
| 655 } | |
| 656 if (!k.is_null()) { | |
| 657 class_has_been_loaded = true; | |
| 658 } | |
| 659 } | |
| 660 | |
| 661 if (!class_has_been_loaded) { | |
| 662 | |
| 663 // add placeholder entry to record loading instance class | |
| 664 // Five cases: | |
| 665 // All cases need to prevent modifying bootclasssearchpath | |
| 666 // in parallel with a classload of same classname | |
| 514 | 667 // Redefineclasses uses existence of the placeholder for the duration |
| 668 // of the class load to prevent concurrent redefinition of not completely | |
| 669 // defined classes. | |
| 0 | 670 // case 1. traditional classloaders that rely on the classloader object lock |
| 671 // - no other need for LOAD_INSTANCE | |
| 672 // case 2. traditional classloaders that break the classloader object lock | |
| 673 // as a deadlock workaround. Detection of this case requires that | |
| 674 // this check is done while holding the classloader object lock, | |
| 675 // and that lock is still held when calling classloader's loadClass. | |
| 676 // For these classloaders, we ensure that the first requestor | |
| 677 // completes the load and other requestors wait for completion. | |
| 678 // case 3. UnsyncloadClass - don't use objectLocker | |
| 679 // With this flag, we allow parallel classloading of a | |
| 680 // class/classloader pair | |
| 681 // case4. Bootstrap classloader - don't own objectLocker | |
| 682 // This classloader supports parallelism at the classloader level, | |
| 683 // but only allows a single load of a class/classloader pair. | |
| 684 // No performance benefit and no deadlock issues. | |
| 514 | 685 // case 5. parallelCapable user level classloaders - without objectLocker |
| 686 // Allow parallel classloading of a class/classloader pair | |
| 0 | 687 bool throw_circularity_error = false; |
| 688 { | |
| 689 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 514 | 690 if (class_loader.is_null() || !is_parallelCapable(class_loader)) { |
| 0 | 691 PlaceholderEntry* oldprobe = placeholders()->get_entry(p_index, p_hash, name, class_loader); |
| 692 if (oldprobe) { | |
| 693 // only need check_seen_thread once, not on each loop | |
| 694 // 6341374 java/lang/Instrument with -Xcomp | |
| 695 if (oldprobe->check_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE)) { | |
| 696 throw_circularity_error = true; | |
| 697 } else { | |
| 698 // case 1: traditional: should never see load_in_progress. | |
| 699 while (!class_has_been_loaded && oldprobe && oldprobe->instance_load_in_progress()) { | |
| 700 | |
| 701 // case 4: bootstrap classloader: prevent futile classloading, | |
| 702 // wait on first requestor | |
| 703 if (class_loader.is_null()) { | |
| 704 SystemDictionary_lock->wait(); | |
| 705 } else { | |
| 706 // case 2: traditional with broken classloader lock. wait on first | |
| 707 // requestor. | |
| 708 double_lock_wait(lockObject, THREAD); | |
| 709 } | |
| 710 // Check if classloading completed while we were waiting | |
| 711 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 712 if (check != NULL) { | |
| 713 // Klass is already loaded, so just return it | |
| 714 k = instanceKlassHandle(THREAD, check); | |
| 715 class_has_been_loaded = true; | |
| 716 } | |
| 717 // check if other thread failed to load and cleaned up | |
| 718 oldprobe = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
| 719 } | |
| 720 } | |
| 721 } | |
| 722 } | |
| 723 // All cases: add LOAD_INSTANCE | |
| 514 | 724 // case 3: UnsyncloadClass || case 5: parallelCapable: allow competing threads to try |
| 0 | 725 // LOAD_INSTANCE in parallel |
| 726 // add placeholder entry even if error - callers will remove on error | |
| 514 | 727 if (!throw_circularity_error && !class_has_been_loaded) { |
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728 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, name, class_loader, PlaceholderTable::LOAD_INSTANCE, NULL, THREAD); |
| 0 | 729 // For class loaders that do not acquire the classloader object lock, |
| 730 // if they did not catch another thread holding LOAD_INSTANCE, | |
| 731 // need a check analogous to the acquire ObjectLocker/find_class | |
| 732 // i.e. now that we hold the LOAD_INSTANCE token on loading this class/CL | |
| 733 // one final check if the load has already completed | |
| 514 | 734 // class loaders holding the ObjectLock shouldn't find the class here |
| 0 | 735 klassOop check = find_class(d_index, d_hash, name, class_loader); |
| 736 if (check != NULL) { | |
| 737 // Klass is already loaded, so just return it | |
| 738 k = instanceKlassHandle(THREAD, check); | |
| 739 class_has_been_loaded = true; | |
| 740 newprobe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE); | |
| 514 | 741 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); |
| 742 SystemDictionary_lock->notify_all(); | |
| 0 | 743 } |
| 744 } | |
| 745 } | |
| 746 // must throw error outside of owning lock | |
| 747 if (throw_circularity_error) { | |
| 748 ResourceMark rm(THREAD); | |
| 749 THROW_MSG_0(vmSymbols::java_lang_ClassCircularityError(), name->as_C_string()); | |
| 750 } | |
| 751 | |
| 752 if (!class_has_been_loaded) { | |
| 753 | |
| 754 // Do actual loading | |
| 755 k = load_instance_class(name, class_loader, THREAD); | |
| 756 | |
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757 // For UnsyncloadClass only |
| 0 | 758 // If they got a linkageError, check if a parallel class load succeeded. |
| 759 // If it did, then for bytecode resolution the specification requires | |
| 760 // that we return the same result we did for the other thread, i.e. the | |
| 761 // successfully loaded instanceKlass | |
| 762 // Should not get here for classloaders that support parallelism | |
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763 // with the new cleaner mechanism, even with AllowParallelDefineClass |
| 514 | 764 // Bootstrap goes through here to allow for an extra guarantee check |
| 0 | 765 if (UnsyncloadClass || (class_loader.is_null())) { |
| 766 if (k.is_null() && HAS_PENDING_EXCEPTION | |
| 1142 | 767 && PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { |
| 0 | 768 MutexLocker mu(SystemDictionary_lock, THREAD); |
| 769 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 770 if (check != NULL) { | |
| 771 // Klass is already loaded, so just use it | |
| 772 k = instanceKlassHandle(THREAD, check); | |
| 773 CLEAR_PENDING_EXCEPTION; | |
| 774 guarantee((!class_loader.is_null()), "dup definition for bootstrap loader?"); | |
| 775 } | |
| 776 } | |
| 777 } | |
| 778 | |
| 779 // clean up placeholder entries for success or error | |
| 780 // This cleans up LOAD_INSTANCE entries | |
| 781 // It also cleans up LOAD_SUPER entries on errors from | |
| 782 // calling load_instance_class | |
| 783 { | |
| 784 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 785 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
| 786 if (probe != NULL) { | |
| 787 probe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE); | |
| 788 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
| 789 SystemDictionary_lock->notify_all(); | |
| 790 } | |
| 791 } | |
| 792 | |
| 793 // If everything was OK (no exceptions, no null return value), and | |
| 794 // class_loader is NOT the defining loader, do a little more bookkeeping. | |
| 795 if (!HAS_PENDING_EXCEPTION && !k.is_null() && | |
| 796 k->class_loader() != class_loader()) { | |
| 797 | |
| 798 check_constraints(d_index, d_hash, k, class_loader, false, THREAD); | |
| 799 | |
| 800 // Need to check for a PENDING_EXCEPTION again; check_constraints | |
| 801 // can throw and doesn't use the CHECK macro. | |
| 802 if (!HAS_PENDING_EXCEPTION) { | |
| 803 { // Grabbing the Compile_lock prevents systemDictionary updates | |
| 804 // during compilations. | |
| 805 MutexLocker mu(Compile_lock, THREAD); | |
| 806 update_dictionary(d_index, d_hash, p_index, p_hash, | |
| 807 k, class_loader, THREAD); | |
| 808 } | |
| 809 if (JvmtiExport::should_post_class_load()) { | |
| 810 Thread *thread = THREAD; | |
| 811 assert(thread->is_Java_thread(), "thread->is_Java_thread()"); | |
| 812 JvmtiExport::post_class_load((JavaThread *) thread, k()); | |
| 813 } | |
| 814 } | |
| 815 } | |
| 816 if (HAS_PENDING_EXCEPTION || k.is_null()) { | |
| 817 // On error, clean up placeholders | |
| 818 { | |
| 819 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 820 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
| 821 SystemDictionary_lock->notify_all(); | |
| 822 } | |
| 823 return NULL; | |
| 824 } | |
| 825 } | |
| 826 } | |
| 827 | |
| 828 #ifdef ASSERT | |
| 829 { | |
| 830 Handle loader (THREAD, k->class_loader()); | |
| 831 MutexLocker mu(SystemDictionary_lock, THREAD); | |
|
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832 oop kk = find_class(name, loader); |
| 0 | 833 assert(kk == k(), "should be present in dictionary"); |
| 834 } | |
| 835 #endif | |
| 836 | |
| 837 // return if the protection domain in NULL | |
| 838 if (protection_domain() == NULL) return k(); | |
| 839 | |
| 840 // Check the protection domain has the right access | |
| 841 { | |
| 842 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 843 // Note that we have an entry, and entries can be deleted only during GC, | |
| 844 // so we cannot allow GC to occur while we're holding this entry. | |
| 845 // We're using a No_Safepoint_Verifier to catch any place where we | |
| 846 // might potentially do a GC at all. | |
| 847 // SystemDictionary::do_unloading() asserts that classes are only | |
| 848 // unloaded at a safepoint. | |
| 849 No_Safepoint_Verifier nosafepoint; | |
| 850 if (dictionary()->is_valid_protection_domain(d_index, d_hash, name, | |
| 851 class_loader, | |
| 852 protection_domain)) { | |
| 853 return k(); | |
| 854 } | |
| 855 } | |
| 856 | |
| 857 // Verify protection domain. If it fails an exception is thrown | |
| 858 validate_protection_domain(k, class_loader, protection_domain, CHECK_(klassOop(NULL))); | |
| 859 | |
| 860 return k(); | |
| 861 } | |
| 862 | |
| 863 | |
| 864 // This routine does not lock the system dictionary. | |
| 865 // | |
| 866 // Since readers don't hold a lock, we must make sure that system | |
| 867 // dictionary entries are only removed at a safepoint (when only one | |
| 868 // thread is running), and are added to in a safe way (all links must | |
| 869 // be updated in an MT-safe manner). | |
| 870 // | |
| 871 // Callers should be aware that an entry could be added just after | |
| 872 // _dictionary->bucket(index) is read here, so the caller will not see | |
| 873 // the new entry. | |
| 874 | |
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875 klassOop SystemDictionary::find(Symbol* class_name, |
| 0 | 876 Handle class_loader, |
| 877 Handle protection_domain, | |
| 878 TRAPS) { | |
| 879 | |
|
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880 // UseNewReflection |
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881 // The result of this call should be consistent with the result |
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882 // of the call to resolve_instance_class_or_null(). |
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883 // See evaluation 6790209 and 4474172 for more details. |
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884 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); |
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885 |
| 0 | 886 unsigned int d_hash = dictionary()->compute_hash(class_name, class_loader); |
| 887 int d_index = dictionary()->hash_to_index(d_hash); | |
| 888 | |
| 889 { | |
| 890 // Note that we have an entry, and entries can be deleted only during GC, | |
| 891 // so we cannot allow GC to occur while we're holding this entry. | |
| 892 // We're using a No_Safepoint_Verifier to catch any place where we | |
| 893 // might potentially do a GC at all. | |
| 894 // SystemDictionary::do_unloading() asserts that classes are only | |
| 895 // unloaded at a safepoint. | |
| 896 No_Safepoint_Verifier nosafepoint; | |
| 897 return dictionary()->find(d_index, d_hash, class_name, class_loader, | |
| 898 protection_domain, THREAD); | |
| 899 } | |
| 900 } | |
| 901 | |
| 902 | |
| 903 // Look for a loaded instance or array klass by name. Do not do any loading. | |
| 904 // return NULL in case of error. | |
|
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905 klassOop SystemDictionary::find_instance_or_array_klass(Symbol* class_name, |
| 0 | 906 Handle class_loader, |
| 907 Handle protection_domain, | |
| 908 TRAPS) { | |
| 909 klassOop k = NULL; | |
|
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910 assert(class_name != NULL, "class name must be non NULL"); |
|
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911 |
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912 // Try to get one of the well-known klasses. |
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913 if (LinkWellKnownClasses) { |
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914 k = find_well_known_klass(class_name); |
|
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915 if (k != NULL) { |
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916 return k; |
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917 } |
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918 } |
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919 |
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920 if (FieldType::is_array(class_name)) { |
| 0 | 921 // The name refers to an array. Parse the name. |
|
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922 // dimension and object_key in FieldArrayInfo are assigned as a |
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923 // side-effect of this call |
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924 FieldArrayInfo fd; |
|
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925 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
| 0 | 926 if (t != T_OBJECT) { |
| 927 k = Universe::typeArrayKlassObj(t); | |
| 928 } else { | |
|
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929 k = SystemDictionary::find(fd.object_key(), class_loader, protection_domain, THREAD); |
| 0 | 930 } |
| 931 if (k != NULL) { | |
|
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932 k = Klass::cast(k)->array_klass_or_null(fd.dimension()); |
| 0 | 933 } |
| 934 } else { | |
| 935 k = find(class_name, class_loader, protection_domain, THREAD); | |
| 936 } | |
| 937 return k; | |
| 938 } | |
| 939 | |
|
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940 // Quick range check for names of well-known classes: |
|
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941 static Symbol* wk_klass_name_limits[2] = {NULL, NULL}; |
|
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942 |
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943 #ifndef PRODUCT |
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944 static int find_wkk_calls, find_wkk_probes, find_wkk_wins; |
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945 // counts for "hello world": 3983, 1616, 1075 |
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946 // => 60% hit after limit guard, 25% total win rate |
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947 #endif |
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948 |
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949 klassOop SystemDictionary::find_well_known_klass(Symbol* class_name) { |
|
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950 // A bounds-check on class_name will quickly get a negative result. |
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951 NOT_PRODUCT(find_wkk_calls++); |
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952 if (class_name >= wk_klass_name_limits[0] && |
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953 class_name <= wk_klass_name_limits[1]) { |
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954 NOT_PRODUCT(find_wkk_probes++); |
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955 vmSymbols::SID sid = vmSymbols::find_sid(class_name); |
|
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956 if (sid != vmSymbols::NO_SID) { |
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957 klassOop k = NULL; |
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958 switch (sid) { |
|
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959 #define WK_KLASS_CASE(name, symbol, ignore_option) \ |
|
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960 case vmSymbols::VM_SYMBOL_ENUM_NAME(symbol): \ |
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961 k = WK_KLASS(name); break; |
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962 WK_KLASSES_DO(WK_KLASS_CASE) |
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963 #undef WK_KLASS_CASE |
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964 } |
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965 NOT_PRODUCT(if (k != NULL) find_wkk_wins++); |
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966 return k; |
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967 } |
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968 } |
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969 return NULL; |
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970 } |
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971 |
| 0 | 972 // Note: this method is much like resolve_from_stream, but |
| 973 // updates no supplemental data structures. | |
| 974 // TODO consolidate the two methods with a helper routine? | |
|
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975 klassOop SystemDictionary::parse_stream(Symbol* class_name, |
| 0 | 976 Handle class_loader, |
| 977 Handle protection_domain, | |
| 978 ClassFileStream* st, | |
|
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979 KlassHandle host_klass, |
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980 GrowableArray<Handle>* cp_patches, |
| 0 | 981 TRAPS) { |
|
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982 TempNewSymbol parsed_name = NULL; |
| 0 | 983 |
| 984 // Parse the stream. Note that we do this even though this klass might | |
| 985 // already be present in the SystemDictionary, otherwise we would not | |
| 986 // throw potential ClassFormatErrors. | |
| 987 // | |
| 988 // Note: "name" is updated. | |
| 989 // Further note: a placeholder will be added for this class when | |
| 990 // super classes are loaded (resolve_super_or_fail). We expect this | |
| 991 // to be called for all classes but java.lang.Object; and we preload | |
| 992 // java.lang.Object through resolve_or_fail, not this path. | |
| 993 | |
| 994 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
| 995 class_loader, | |
| 996 protection_domain, | |
| 710 | 997 host_klass, |
| 998 cp_patches, | |
| 0 | 999 parsed_name, |
|
973
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1000 true, |
| 0 | 1001 THREAD); |
| 1002 | |
| 1003 // We don't redefine the class, so we just need to clean up whether there | |
| 1004 // was an error or not (don't want to modify any system dictionary | |
| 1005 // data structures). | |
| 1006 // Parsed name could be null if we threw an error before we got far | |
| 1007 // enough along to parse it -- in that case, there is nothing to clean up. | |
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1008 if (parsed_name != NULL) { |
| 0 | 1009 unsigned int p_hash = placeholders()->compute_hash(parsed_name, |
| 1010 class_loader); | |
| 1011 int p_index = placeholders()->hash_to_index(p_hash); | |
| 1012 { | |
| 1013 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 1014 placeholders()->find_and_remove(p_index, p_hash, parsed_name, class_loader, THREAD); | |
| 1015 SystemDictionary_lock->notify_all(); | |
| 1016 } | |
| 1017 } | |
| 1018 | |
|
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1019 if (host_klass.not_null() && k.not_null()) { |
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1020 assert(AnonymousClasses, ""); |
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1021 // If it's anonymous, initialize it now, since nobody else will. |
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1022 k->set_host_klass(host_klass()); |
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1023 |
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1024 { |
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1025 MutexLocker mu_r(Compile_lock, THREAD); |
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1026 |
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1027 // Add to class hierarchy, initialize vtables, and do possible |
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1028 // deoptimizations. |
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1029 add_to_hierarchy(k, CHECK_NULL); // No exception, but can block |
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1030 |
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1031 // But, do not add to system dictionary. |
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1032 } |
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1033 |
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1034 k->eager_initialize(THREAD); |
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1035 |
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1036 // notify jvmti |
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1037 if (JvmtiExport::should_post_class_load()) { |
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1038 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); |
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1039 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); |
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1040 } |
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1041 } |
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1042 |
| 0 | 1043 return k(); |
| 1044 } | |
| 1045 | |
| 1046 // Add a klass to the system from a stream (called by jni_DefineClass and | |
| 1047 // JVM_DefineClass). | |
| 1048 // Note: class_name can be NULL. In that case we do not know the name of | |
| 1049 // the class until we have parsed the stream. | |
| 1050 | |
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1051 klassOop SystemDictionary::resolve_from_stream(Symbol* class_name, |
| 0 | 1052 Handle class_loader, |
| 1053 Handle protection_domain, | |
| 1054 ClassFileStream* st, | |
|
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1055 bool verify, |
| 0 | 1056 TRAPS) { |
| 1057 | |
| 514 | 1058 // Classloaders that support parallelism, e.g. bootstrap classloader, |
| 1059 // or all classloaders with UnsyncloadClass do not acquire lock here | |
| 1060 bool DoObjectLock = true; | |
| 1061 if (is_parallelCapable(class_loader)) { | |
| 1062 DoObjectLock = false; | |
| 1063 } | |
| 1064 | |
| 1065 // Make sure we are synchronized on the class loader before we proceed | |
| 0 | 1066 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); |
| 1067 check_loader_lock_contention(lockObject, THREAD); | |
| 514 | 1068 ObjectLocker ol(lockObject, THREAD, DoObjectLock); |
| 0 | 1069 |
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1070 TempNewSymbol parsed_name = NULL; |
| 0 | 1071 |
| 1072 // Parse the stream. Note that we do this even though this klass might | |
| 1073 // already be present in the SystemDictionary, otherwise we would not | |
| 1074 // throw potential ClassFormatErrors. | |
| 1075 // | |
| 1076 // Note: "name" is updated. | |
| 1077 // Further note: a placeholder will be added for this class when | |
| 1078 // super classes are loaded (resolve_super_or_fail). We expect this | |
| 1079 // to be called for all classes but java.lang.Object; and we preload | |
| 1080 // java.lang.Object through resolve_or_fail, not this path. | |
| 1081 | |
| 1082 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
| 1083 class_loader, | |
| 1084 protection_domain, | |
| 1085 parsed_name, | |
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1086 verify, |
| 0 | 1087 THREAD); |
| 1088 | |
| 1089 const char* pkg = "java/"; | |
| 1090 if (!HAS_PENDING_EXCEPTION && | |
| 1091 !class_loader.is_null() && | |
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1092 parsed_name != NULL && |
| 0 | 1093 !strncmp((const char*)parsed_name->bytes(), pkg, strlen(pkg))) { |
| 1094 // It is illegal to define classes in the "java." package from | |
| 1095 // JVM_DefineClass or jni_DefineClass unless you're the bootclassloader | |
| 1096 ResourceMark rm(THREAD); | |
| 1097 char* name = parsed_name->as_C_string(); | |
| 1098 char* index = strrchr(name, '/'); | |
| 1099 *index = '\0'; // chop to just the package name | |
| 1100 while ((index = strchr(name, '/')) != NULL) { | |
| 1101 *index = '.'; // replace '/' with '.' in package name | |
| 1102 } | |
| 1103 const char* fmt = "Prohibited package name: %s"; | |
| 1104 size_t len = strlen(fmt) + strlen(name); | |
| 1105 char* message = NEW_RESOURCE_ARRAY(char, len); | |
| 1106 jio_snprintf(message, len, fmt, name); | |
| 1107 Exceptions::_throw_msg(THREAD_AND_LOCATION, | |
| 1108 vmSymbols::java_lang_SecurityException(), message); | |
| 1109 } | |
| 1110 | |
| 1111 if (!HAS_PENDING_EXCEPTION) { | |
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1112 assert(parsed_name != NULL, "Sanity"); |
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1113 assert(class_name == NULL || class_name == parsed_name, "name mismatch"); |
| 0 | 1114 // Verification prevents us from creating names with dots in them, this |
| 1115 // asserts that that's the case. | |
| 1116 assert(is_internal_format(parsed_name), | |
| 1117 "external class name format used internally"); | |
| 1118 | |
| 1119 // Add class just loaded | |
| 514 | 1120 // If a class loader supports parallel classloading handle parallel define requests |
| 1121 // find_or_define_instance_class may return a different instanceKlass | |
| 1122 if (is_parallelCapable(class_loader)) { | |
| 1123 k = find_or_define_instance_class(class_name, class_loader, k, THREAD); | |
| 1124 } else { | |
| 1125 define_instance_class(k, THREAD); | |
| 1126 } | |
| 0 | 1127 } |
| 1128 | |
| 1129 // If parsing the class file or define_instance_class failed, we | |
| 1130 // need to remove the placeholder added on our behalf. But we | |
| 1131 // must make sure parsed_name is valid first (it won't be if we had | |
| 1132 // a format error before the class was parsed far enough to | |
| 1133 // find the name). | |
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1134 if (HAS_PENDING_EXCEPTION && parsed_name != NULL) { |
| 0 | 1135 unsigned int p_hash = placeholders()->compute_hash(parsed_name, |
| 1136 class_loader); | |
| 1137 int p_index = placeholders()->hash_to_index(p_hash); | |
| 1138 { | |
| 1139 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 1140 placeholders()->find_and_remove(p_index, p_hash, parsed_name, class_loader, THREAD); | |
| 1141 SystemDictionary_lock->notify_all(); | |
| 1142 } | |
| 1143 return NULL; | |
| 1144 } | |
| 1145 | |
| 1146 // Make sure that we didn't leave a place holder in the | |
| 1147 // SystemDictionary; this is only done on success | |
| 1148 debug_only( { | |
| 1149 if (!HAS_PENDING_EXCEPTION) { | |
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1150 assert(parsed_name != NULL, "parsed_name is still null?"); |
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1151 Symbol* h_name = k->name(); |
| 0 | 1152 Handle h_loader (THREAD, k->class_loader()); |
| 1153 | |
| 1154 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 1155 | |
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1156 klassOop check = find_class(parsed_name, class_loader); |
| 0 | 1157 assert(check == k(), "should be present in the dictionary"); |
| 1158 | |
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1159 klassOop check2 = find_class(h_name, h_loader); |
| 0 | 1160 assert(check == check2, "name inconsistancy in SystemDictionary"); |
| 1161 } | |
| 1162 } ); | |
| 1163 | |
| 1164 return k(); | |
| 1165 } | |
| 1166 | |
| 1167 | |
| 1168 void SystemDictionary::set_shared_dictionary(HashtableBucket* t, int length, | |
| 1169 int number_of_entries) { | |
| 1170 assert(length == _nof_buckets * sizeof(HashtableBucket), | |
| 1171 "bad shared dictionary size."); | |
| 1172 _shared_dictionary = new Dictionary(_nof_buckets, t, number_of_entries); | |
| 1173 } | |
| 1174 | |
| 1175 | |
| 1176 // If there is a shared dictionary, then find the entry for the | |
| 1177 // given shared system class, if any. | |
| 1178 | |
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1179 klassOop SystemDictionary::find_shared_class(Symbol* class_name) { |
| 0 | 1180 if (shared_dictionary() != NULL) { |
| 1181 unsigned int d_hash = dictionary()->compute_hash(class_name, Handle()); | |
| 1182 int d_index = dictionary()->hash_to_index(d_hash); | |
| 1183 return shared_dictionary()->find_shared_class(d_index, d_hash, class_name); | |
| 1184 } else { | |
| 1185 return NULL; | |
| 1186 } | |
| 1187 } | |
| 1188 | |
| 1189 | |
| 1190 // Load a class from the shared spaces (found through the shared system | |
| 1191 // dictionary). Force the superclass and all interfaces to be loaded. | |
| 1192 // Update the class definition to include sibling classes and no | |
| 1193 // subclasses (yet). [Classes in the shared space are not part of the | |
| 1194 // object hierarchy until loaded.] | |
| 1195 | |
| 1196 instanceKlassHandle SystemDictionary::load_shared_class( | |
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1197 Symbol* class_name, Handle class_loader, TRAPS) { |
| 0 | 1198 instanceKlassHandle ik (THREAD, find_shared_class(class_name)); |
| 1199 return load_shared_class(ik, class_loader, THREAD); | |
| 1200 } | |
| 1201 | |
| 1202 // Note well! Changes to this method may affect oop access order | |
| 1203 // in the shared archive. Please take care to not make changes that | |
| 1204 // adversely affect cold start time by changing the oop access order | |
| 1205 // that is specified in dump.cpp MarkAndMoveOrderedReadOnly and | |
| 1206 // MarkAndMoveOrderedReadWrite closures. | |
| 1207 instanceKlassHandle SystemDictionary::load_shared_class( | |
| 1208 instanceKlassHandle ik, Handle class_loader, TRAPS) { | |
| 1209 assert(class_loader.is_null(), "non-null classloader for shared class?"); | |
| 1210 if (ik.not_null()) { | |
| 1211 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1212 Symbol* class_name = ik->name(); |
| 0 | 1213 |
| 1214 // Found the class, now load the superclass and interfaces. If they | |
| 1215 // are shared, add them to the main system dictionary and reset | |
| 1216 // their hierarchy references (supers, subs, and interfaces). | |
| 1217 | |
| 1218 if (ik->super() != NULL) { | |
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1219 Symbol* cn = ik->super()->klass_part()->name(); |
| 0 | 1220 resolve_super_or_fail(class_name, cn, |
| 1221 class_loader, Handle(), true, CHECK_(nh)); | |
| 1222 } | |
| 1223 | |
| 1224 objArrayHandle interfaces (THREAD, ik->local_interfaces()); | |
| 1225 int num_interfaces = interfaces->length(); | |
| 1226 for (int index = 0; index < num_interfaces; index++) { | |
| 1227 klassOop k = klassOop(interfaces->obj_at(index)); | |
| 1228 | |
| 1229 // Note: can not use instanceKlass::cast here because | |
| 1230 // interfaces' instanceKlass's C++ vtbls haven't been | |
| 1231 // reinitialized yet (they will be once the interface classes | |
| 1232 // are loaded) | |
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1233 Symbol* name = k->klass_part()->name(); |
| 0 | 1234 resolve_super_or_fail(class_name, name, class_loader, Handle(), false, CHECK_(nh)); |
| 1235 } | |
| 1236 | |
| 1237 // Adjust methods to recover missing data. They need addresses for | |
| 1238 // interpreter entry points and their default native method address | |
| 1239 // must be reset. | |
| 1240 | |
| 1241 // Updating methods must be done under a lock so multiple | |
| 1242 // threads don't update these in parallel | |
| 1243 // Shared classes are all currently loaded by the bootstrap | |
| 1244 // classloader, so this will never cause a deadlock on | |
| 1245 // a custom class loader lock. | |
| 1246 | |
| 1247 { | |
| 1248 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
| 1249 check_loader_lock_contention(lockObject, THREAD); | |
| 1250 ObjectLocker ol(lockObject, THREAD, true); | |
| 1251 | |
| 1252 objArrayHandle methods (THREAD, ik->methods()); | |
| 1253 int num_methods = methods->length(); | |
| 1254 for (int index2 = 0; index2 < num_methods; ++index2) { | |
| 1255 methodHandle m(THREAD, methodOop(methods->obj_at(index2))); | |
| 1256 m()->link_method(m, CHECK_(nh)); | |
| 1257 } | |
| 1258 } | |
| 1259 | |
| 1260 if (TraceClassLoading) { | |
| 1261 ResourceMark rm; | |
| 1262 tty->print("[Loaded %s", ik->external_name()); | |
| 1263 tty->print(" from shared objects file"); | |
| 1264 tty->print_cr("]"); | |
| 1265 } | |
| 1266 // notify a class loaded from shared object | |
| 1267 ClassLoadingService::notify_class_loaded(instanceKlass::cast(ik()), | |
| 1268 true /* shared class */); | |
| 1269 } | |
| 1270 return ik; | |
| 1271 } | |
| 1272 | |
| 1273 #ifdef KERNEL | |
| 1274 // Some classes on the bootstrap class path haven't been installed on the | |
| 1275 // system yet. Call the DownloadManager method to make them appear in the | |
| 1276 // bootstrap class path and try again to load the named class. | |
| 1277 // Note that with delegation class loaders all classes in another loader will | |
| 1278 // first try to call this so it'd better be fast!! | |
| 1279 static instanceKlassHandle download_and_retry_class_load( | |
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1280 Symbol* class_name, |
| 0 | 1281 TRAPS) { |
| 1282 | |
| 1283 klassOop dlm = SystemDictionary::sun_jkernel_DownloadManager_klass(); | |
| 1284 instanceKlassHandle nk; | |
| 1285 | |
| 1286 // If download manager class isn't loaded just return. | |
| 1287 if (dlm == NULL) return nk; | |
| 1288 | |
| 1289 { HandleMark hm(THREAD); | |
| 1290 ResourceMark rm(THREAD); | |
| 1291 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nk)); | |
| 1292 Handle class_string = java_lang_String::externalize_classname(s, CHECK_(nk)); | |
| 1293 | |
| 1294 // return value | |
| 1295 JavaValue result(T_OBJECT); | |
| 1296 | |
| 1297 // Call the DownloadManager. We assume that it has a lock because | |
| 1298 // multiple classes could be not found and downloaded at the same time. | |
| 1299 // class sun.misc.DownloadManager; | |
| 1300 // public static String getBootClassPathEntryForClass(String className); | |
| 1301 JavaCalls::call_static(&result, | |
| 1302 KlassHandle(THREAD, dlm), | |
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1303 vmSymbols::getBootClassPathEntryForClass_name(), |
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1304 vmSymbols::string_string_signature(), |
| 0 | 1305 class_string, |
| 1306 CHECK_(nk)); | |
| 1307 | |
| 1308 // Get result.string and add to bootclasspath | |
| 1309 assert(result.get_type() == T_OBJECT, "just checking"); | |
| 1310 oop obj = (oop) result.get_jobject(); | |
| 1311 if (obj == NULL) { return nk; } | |
| 1312 | |
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1313 Handle h_obj(THREAD, obj); |
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1314 char* new_class_name = java_lang_String::as_platform_dependent_str(h_obj, |
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1315 CHECK_(nk)); |
| 0 | 1316 |
| 1317 // lock the loader | |
| 1318 // we use this lock because JVMTI does. | |
| 1319 Handle loader_lock(THREAD, SystemDictionary::system_loader_lock()); | |
| 1320 | |
| 1321 ObjectLocker ol(loader_lock, THREAD); | |
| 1322 // add the file to the bootclasspath | |
| 1323 ClassLoader::update_class_path_entry_list(new_class_name, true); | |
| 1324 } // end HandleMark | |
| 1325 | |
| 1326 if (TraceClassLoading) { | |
| 1327 ClassLoader::print_bootclasspath(); | |
| 1328 } | |
| 1329 return ClassLoader::load_classfile(class_name, CHECK_(nk)); | |
| 1330 } | |
| 1331 #endif // KERNEL | |
| 1332 | |
| 1333 | |
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1334 instanceKlassHandle SystemDictionary::load_instance_class(Symbol* class_name, Handle class_loader, TRAPS) { |
| 0 | 1335 instanceKlassHandle nh = instanceKlassHandle(); // null Handle |
| 1336 if (class_loader.is_null()) { | |
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1337 |
| 0 | 1338 // Search the shared system dictionary for classes preloaded into the |
| 1339 // shared spaces. | |
| 1340 instanceKlassHandle k; | |
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1341 { |
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1342 PerfTraceTime vmtimer(ClassLoader::perf_shared_classload_time()); |
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1343 k = load_shared_class(class_name, class_loader, THREAD); |
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1344 } |
| 0 | 1345 |
| 1346 if (k.is_null()) { | |
| 1347 // Use VM class loader | |
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1348 PerfTraceTime vmtimer(ClassLoader::perf_sys_classload_time()); |
| 0 | 1349 k = ClassLoader::load_classfile(class_name, CHECK_(nh)); |
| 1350 } | |
| 1351 | |
| 1352 #ifdef KERNEL | |
| 1353 // If the VM class loader has failed to load the class, call the | |
| 1354 // DownloadManager class to make it magically appear on the classpath | |
| 1355 // and try again. This is only configured with the Kernel VM. | |
| 1356 if (k.is_null()) { | |
| 1357 k = download_and_retry_class_load(class_name, CHECK_(nh)); | |
| 1358 } | |
| 1359 #endif // KERNEL | |
| 1360 | |
| 514 | 1361 // find_or_define_instance_class may return a different instanceKlass |
| 0 | 1362 if (!k.is_null()) { |
| 1363 k = find_or_define_instance_class(class_name, class_loader, k, CHECK_(nh)); | |
| 1364 } | |
| 1365 return k; | |
| 1366 } else { | |
| 1367 // Use user specified class loader to load class. Call loadClass operation on class_loader. | |
| 1368 ResourceMark rm(THREAD); | |
| 1369 | |
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1370 assert(THREAD->is_Java_thread(), "must be a JavaThread"); |
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1371 JavaThread* jt = (JavaThread*) THREAD; |
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1372 |
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1373 PerfClassTraceTime vmtimer(ClassLoader::perf_app_classload_time(), |
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1374 ClassLoader::perf_app_classload_selftime(), |
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1375 ClassLoader::perf_app_classload_count(), |
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1376 jt->get_thread_stat()->perf_recursion_counts_addr(), |
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1377 jt->get_thread_stat()->perf_timers_addr(), |
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1378 PerfClassTraceTime::CLASS_LOAD); |
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1379 |
| 0 | 1380 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nh)); |
| 1381 // Translate to external class name format, i.e., convert '/' chars to '.' | |
| 1382 Handle string = java_lang_String::externalize_classname(s, CHECK_(nh)); | |
| 1383 | |
| 1384 JavaValue result(T_OBJECT); | |
| 1385 | |
| 1142 | 1386 KlassHandle spec_klass (THREAD, SystemDictionary::ClassLoader_klass()); |
| 0 | 1387 |
| 514 | 1388 // Call public unsynchronized loadClass(String) directly for all class loaders |
| 1389 // for parallelCapable class loaders. JDK >=7, loadClass(String, boolean) will | |
| 1390 // acquire a class-name based lock rather than the class loader object lock. | |
| 1391 // JDK < 7 already acquire the class loader lock in loadClass(String, boolean), | |
| 1392 // so the call to loadClassInternal() was not required. | |
| 1393 // | |
| 1394 // UnsyncloadClass flag means both call loadClass(String) and do | |
| 1395 // not acquire the class loader lock even for class loaders that are | |
| 1396 // not parallelCapable. This was a risky transitional | |
| 1397 // flag for diagnostic purposes only. It is risky to call | |
| 0 | 1398 // custom class loaders without synchronization. |
| 1399 // WARNING If a custom class loader does NOT synchronizer findClass, or callers of | |
| 514 | 1400 // findClass, the UnsyncloadClass flag risks unexpected timing bugs in the field. |
| 0 | 1401 // Do NOT assume this will be supported in future releases. |
| 514 | 1402 // |
| 1403 // Added MustCallLoadClassInternal in case we discover in the field | |
| 1404 // a customer that counts on this call | |
| 1405 if (MustCallLoadClassInternal && has_loadClassInternal()) { | |
| 0 | 1406 JavaCalls::call_special(&result, |
| 1407 class_loader, | |
| 1408 spec_klass, | |
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1409 vmSymbols::loadClassInternal_name(), |
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1410 vmSymbols::string_class_signature(), |
| 0 | 1411 string, |
| 1412 CHECK_(nh)); | |
| 1413 } else { | |
| 1414 JavaCalls::call_virtual(&result, | |
| 1415 class_loader, | |
| 1416 spec_klass, | |
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1417 vmSymbols::loadClass_name(), |
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1418 vmSymbols::string_class_signature(), |
| 0 | 1419 string, |
| 1420 CHECK_(nh)); | |
| 1421 } | |
| 1422 | |
| 1423 assert(result.get_type() == T_OBJECT, "just checking"); | |
| 1424 oop obj = (oop) result.get_jobject(); | |
| 1425 | |
| 1426 // Primitive classes return null since forName() can not be | |
| 1427 // used to obtain any of the Class objects representing primitives or void | |
| 1428 if ((obj != NULL) && !(java_lang_Class::is_primitive(obj))) { | |
| 1429 instanceKlassHandle k = | |
| 1430 instanceKlassHandle(THREAD, java_lang_Class::as_klassOop(obj)); | |
| 1431 // For user defined Java class loaders, check that the name returned is | |
| 1432 // the same as that requested. This check is done for the bootstrap | |
| 1433 // loader when parsing the class file. | |
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1434 if (class_name == k->name()) { |
| 0 | 1435 return k; |
| 1436 } | |
| 1437 } | |
| 1438 // Class is not found or has the wrong name, return NULL | |
| 1439 return nh; | |
| 1440 } | |
| 1441 } | |
| 1442 | |
| 1443 void SystemDictionary::define_instance_class(instanceKlassHandle k, TRAPS) { | |
| 1444 | |
| 1445 Handle class_loader_h(THREAD, k->class_loader()); | |
| 1446 | |
| 514 | 1447 // for bootstrap and other parallel classloaders don't acquire lock, |
| 1448 // use placeholder token | |
| 1449 // If a parallelCapable class loader calls define_instance_class instead of | |
| 1450 // find_or_define_instance_class to get here, we have a timing | |
| 1451 // hole with systemDictionary updates and check_constraints | |
| 1452 if (!class_loader_h.is_null() && !is_parallelCapable(class_loader_h)) { | |
| 0 | 1453 assert(ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, |
| 1454 compute_loader_lock_object(class_loader_h, THREAD)), | |
| 1455 "define called without lock"); | |
| 1456 } | |
| 1457 | |
| 1458 // Check class-loading constraints. Throw exception if violation is detected. | |
| 1459 // Grabs and releases SystemDictionary_lock | |
| 1460 // The check_constraints/find_class call and update_dictionary sequence | |
| 1461 // must be "atomic" for a specific class/classloader pair so we never | |
| 1462 // define two different instanceKlasses for that class/classloader pair. | |
| 1463 // Existing classloaders will call define_instance_class with the | |
| 1464 // classloader lock held | |
| 1465 // Parallel classloaders will call find_or_define_instance_class | |
| 1466 // which will require a token to perform the define class | |
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1467 Symbol* name_h = k->name(); |
| 0 | 1468 unsigned int d_hash = dictionary()->compute_hash(name_h, class_loader_h); |
| 1469 int d_index = dictionary()->hash_to_index(d_hash); | |
| 1470 check_constraints(d_index, d_hash, k, class_loader_h, true, CHECK); | |
| 1471 | |
| 1472 // Register class just loaded with class loader (placed in Vector) | |
| 1473 // Note we do this before updating the dictionary, as this can | |
| 1474 // fail with an OutOfMemoryError (if it does, we will *not* put this | |
| 1475 // class in the dictionary and will not update the class hierarchy). | |
| 1476 if (k->class_loader() != NULL) { | |
| 1477 methodHandle m(THREAD, Universe::loader_addClass_method()); | |
| 1478 JavaValue result(T_VOID); | |
| 1479 JavaCallArguments args(class_loader_h); | |
| 1480 args.push_oop(Handle(THREAD, k->java_mirror())); | |
| 1481 JavaCalls::call(&result, m, &args, CHECK); | |
| 1482 } | |
| 1483 | |
| 1484 // Add the new class. We need recompile lock during update of CHA. | |
| 1485 { | |
| 1486 unsigned int p_hash = placeholders()->compute_hash(name_h, class_loader_h); | |
| 1487 int p_index = placeholders()->hash_to_index(p_hash); | |
| 1488 | |
| 1489 MutexLocker mu_r(Compile_lock, THREAD); | |
| 1490 | |
| 1491 // Add to class hierarchy, initialize vtables, and do possible | |
| 1492 // deoptimizations. | |
| 1493 add_to_hierarchy(k, CHECK); // No exception, but can block | |
| 1494 | |
| 1495 // Add to systemDictionary - so other classes can see it. | |
| 1496 // Grabs and releases SystemDictionary_lock | |
| 1497 update_dictionary(d_index, d_hash, p_index, p_hash, | |
| 1498 k, class_loader_h, THREAD); | |
| 1499 } | |
| 1500 k->eager_initialize(THREAD); | |
| 1501 | |
| 1502 // notify jvmti | |
| 1503 if (JvmtiExport::should_post_class_load()) { | |
| 1504 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); | |
| 1505 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); | |
| 1506 | |
| 1507 } | |
| 1508 } | |
| 1509 | |
| 1510 // Support parallel classloading | |
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1511 // All parallel class loaders, including bootstrap classloader |
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1512 // lock a placeholder entry for this class/class_loader pair |
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1513 // to allow parallel defines of different classes for this class loader |
| 514 | 1514 // With AllowParallelDefine flag==true, in case they do not synchronize around |
| 1515 // FindLoadedClass/DefineClass, calls, we check for parallel | |
| 0 | 1516 // loading for them, wait if a defineClass is in progress |
| 1517 // and return the initial requestor's results | |
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1518 // This flag does not apply to the bootstrap classloader. |
| 514 | 1519 // With AllowParallelDefine flag==false, call through to define_instance_class |
| 1520 // which will throw LinkageError: duplicate class definition. | |
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1521 // False is the requested default. |
| 0 | 1522 // For better performance, the class loaders should synchronize |
| 514 | 1523 // findClass(), i.e. FindLoadedClass/DefineClassIfAbsent or they |
| 0 | 1524 // potentially waste time reading and parsing the bytestream. |
| 1525 // Note: VM callers should ensure consistency of k/class_name,class_loader | |
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1526 instanceKlassHandle SystemDictionary::find_or_define_instance_class(Symbol* class_name, Handle class_loader, instanceKlassHandle k, TRAPS) { |
| 0 | 1527 |
| 1528 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1529 Symbol* name_h = k->name(); // passed in class_name may be null |
| 0 | 1530 |
| 515 | 1531 unsigned int d_hash = dictionary()->compute_hash(name_h, class_loader); |
| 0 | 1532 int d_index = dictionary()->hash_to_index(d_hash); |
| 1533 | |
| 1534 // Hold SD lock around find_class and placeholder creation for DEFINE_CLASS | |
| 515 | 1535 unsigned int p_hash = placeholders()->compute_hash(name_h, class_loader); |
| 0 | 1536 int p_index = placeholders()->hash_to_index(p_hash); |
| 1537 PlaceholderEntry* probe; | |
| 1538 | |
| 1539 { | |
| 1540 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 1541 // First check if class already defined | |
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1542 if (UnsyncloadClass || (is_parallelDefine(class_loader))) { |
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1543 klassOop check = find_class(d_index, d_hash, name_h, class_loader); |
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1544 if (check != NULL) { |
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1545 return(instanceKlassHandle(THREAD, check)); |
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1546 } |
| 0 | 1547 } |
| 1548 | |
| 1549 // Acquire define token for this class/classloader | |
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1550 probe = placeholders()->find_and_add(p_index, p_hash, name_h, class_loader, PlaceholderTable::DEFINE_CLASS, NULL, THREAD); |
| 514 | 1551 // Wait if another thread defining in parallel |
| 1552 // All threads wait - even those that will throw duplicate class: otherwise | |
| 1553 // caller is surprised by LinkageError: duplicate, but findLoadedClass fails | |
| 1554 // if other thread has not finished updating dictionary | |
| 1555 while (probe->definer() != NULL) { | |
| 1556 SystemDictionary_lock->wait(); | |
| 1557 } | |
| 1558 // Only special cases allow parallel defines and can use other thread's results | |
| 1559 // Other cases fall through, and may run into duplicate defines | |
| 1560 // caught by finding an entry in the SystemDictionary | |
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1561 if ((UnsyncloadClass || is_parallelDefine(class_loader)) && (probe->instanceKlass() != NULL)) { |
| 0 | 1562 probe->remove_seen_thread(THREAD, PlaceholderTable::DEFINE_CLASS); |
| 515 | 1563 placeholders()->find_and_remove(p_index, p_hash, name_h, class_loader, THREAD); |
| 514 | 1564 SystemDictionary_lock->notify_all(); |
| 0 | 1565 #ifdef ASSERT |
| 515 | 1566 klassOop check = find_class(d_index, d_hash, name_h, class_loader); |
| 514 | 1567 assert(check != NULL, "definer missed recording success"); |
| 0 | 1568 #endif |
| 514 | 1569 return(instanceKlassHandle(THREAD, probe->instanceKlass())); |
| 0 | 1570 } else { |
| 514 | 1571 // This thread will define the class (even if earlier thread tried and had an error) |
| 1572 probe->set_definer(THREAD); | |
| 0 | 1573 } |
| 1574 } | |
| 1575 | |
| 1576 define_instance_class(k, THREAD); | |
| 1577 | |
| 1578 Handle linkage_exception = Handle(); // null handle | |
| 1579 | |
| 1580 // definer must notify any waiting threads | |
| 1581 { | |
| 1582 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 515 | 1583 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name_h, class_loader); |
| 0 | 1584 assert(probe != NULL, "DEFINE_CLASS placeholder lost?"); |
| 1585 if (probe != NULL) { | |
| 1586 if (HAS_PENDING_EXCEPTION) { | |
| 1587 linkage_exception = Handle(THREAD,PENDING_EXCEPTION); | |
| 1588 CLEAR_PENDING_EXCEPTION; | |
| 1589 } else { | |
| 1590 probe->set_instanceKlass(k()); | |
| 1591 } | |
| 1592 probe->set_definer(NULL); | |
| 1593 probe->remove_seen_thread(THREAD, PlaceholderTable::DEFINE_CLASS); | |
| 515 | 1594 placeholders()->find_and_remove(p_index, p_hash, name_h, class_loader, THREAD); |
| 0 | 1595 SystemDictionary_lock->notify_all(); |
| 1596 } | |
| 1597 } | |
| 1598 | |
| 1599 // Can't throw exception while holding lock due to rank ordering | |
| 1600 if (linkage_exception() != NULL) { | |
| 1601 THROW_OOP_(linkage_exception(), nh); // throws exception and returns | |
| 1602 } | |
| 1603 | |
| 1604 return k; | |
| 1605 } | |
| 1606 Handle SystemDictionary::compute_loader_lock_object(Handle class_loader, TRAPS) { | |
| 1607 // If class_loader is NULL we synchronize on _system_loader_lock_obj | |
| 1608 if (class_loader.is_null()) { | |
| 1609 return Handle(THREAD, _system_loader_lock_obj); | |
| 1610 } else { | |
| 1611 return class_loader; | |
| 1612 } | |
| 1613 } | |
| 1614 | |
| 1615 // This method is added to check how often we have to wait to grab loader | |
| 1616 // lock. The results are being recorded in the performance counters defined in | |
| 1617 // ClassLoader::_sync_systemLoaderLockContentionRate and | |
| 1618 // ClassLoader::_sync_nonSystemLoaderLockConteionRate. | |
| 1619 void SystemDictionary::check_loader_lock_contention(Handle loader_lock, TRAPS) { | |
| 1620 if (!UsePerfData) { | |
| 1621 return; | |
| 1622 } | |
| 1623 | |
| 1624 assert(!loader_lock.is_null(), "NULL lock object"); | |
| 1625 | |
| 1626 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader_lock) | |
| 1627 == ObjectSynchronizer::owner_other) { | |
| 1628 // contention will likely happen, so increment the corresponding | |
| 1629 // contention counter. | |
| 1630 if (loader_lock() == _system_loader_lock_obj) { | |
| 1631 ClassLoader::sync_systemLoaderLockContentionRate()->inc(); | |
| 1632 } else { | |
| 1633 ClassLoader::sync_nonSystemLoaderLockContentionRate()->inc(); | |
| 1634 } | |
| 1635 } | |
| 1636 } | |
| 1637 | |
| 1638 // ---------------------------------------------------------------------------- | |
| 1639 // Lookup | |
| 1640 | |
| 1641 klassOop SystemDictionary::find_class(int index, unsigned int hash, | |
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1642 Symbol* class_name, |
| 0 | 1643 Handle class_loader) { |
| 1644 assert_locked_or_safepoint(SystemDictionary_lock); | |
| 1645 assert (index == dictionary()->index_for(class_name, class_loader), | |
| 1646 "incorrect index?"); | |
| 1647 | |
| 1648 klassOop k = dictionary()->find_class(index, hash, class_name, class_loader); | |
| 1649 return k; | |
| 1650 } | |
| 1651 | |
| 1652 | |
| 1653 // Basic find on classes in the midst of being loaded | |
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1654 Symbol* SystemDictionary::find_placeholder(Symbol* class_name, |
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1655 Handle class_loader) { |
| 0 | 1656 assert_locked_or_safepoint(SystemDictionary_lock); |
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1657 unsigned int p_hash = placeholders()->compute_hash(class_name, class_loader); |
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1658 int p_index = placeholders()->hash_to_index(p_hash); |
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1659 return placeholders()->find_entry(p_index, p_hash, class_name, class_loader); |
| 0 | 1660 } |
| 1661 | |
| 1662 | |
| 1663 // Used for assertions and verification only | |
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1664 klassOop SystemDictionary::find_class(Symbol* class_name, Handle class_loader) { |
| 0 | 1665 #ifndef ASSERT |
| 1666 guarantee(VerifyBeforeGC || | |
| 1667 VerifyDuringGC || | |
| 1668 VerifyBeforeExit || | |
| 1669 VerifyAfterGC, "too expensive"); | |
| 1670 #endif | |
| 1671 assert_locked_or_safepoint(SystemDictionary_lock); | |
| 1672 | |
| 1673 // First look in the loaded class array | |
| 1674 unsigned int d_hash = dictionary()->compute_hash(class_name, class_loader); | |
| 1675 int d_index = dictionary()->hash_to_index(d_hash); | |
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1676 return find_class(d_index, d_hash, class_name, class_loader); |
| 0 | 1677 } |
| 1678 | |
| 1679 | |
| 1680 // Get the next class in the diictionary. | |
| 1681 klassOop SystemDictionary::try_get_next_class() { | |
| 1682 return dictionary()->try_get_next_class(); | |
| 1683 } | |
| 1684 | |
| 1685 | |
| 1686 // ---------------------------------------------------------------------------- | |
| 1687 // Update hierachy. This is done before the new klass has been added to the SystemDictionary. The Recompile_lock | |
| 1688 // is held, to ensure that the compiler is not using the class hierachy, and that deoptimization will kick in | |
| 1689 // before a new class is used. | |
| 1690 | |
| 1691 void SystemDictionary::add_to_hierarchy(instanceKlassHandle k, TRAPS) { | |
| 1692 assert(k.not_null(), "just checking"); | |
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1693 assert_locked_or_safepoint(Compile_lock); |
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1694 |
| 0 | 1695 // Link into hierachy. Make sure the vtables are initialized before linking into |
| 1696 k->append_to_sibling_list(); // add to superklass/sibling list | |
| 1697 k->process_interfaces(THREAD); // handle all "implements" declarations | |
| 1698 k->set_init_state(instanceKlass::loaded); | |
| 1699 // Now flush all code that depended on old class hierarchy. | |
| 1700 // Note: must be done *after* linking k into the hierarchy (was bug 12/9/97) | |
| 1701 // Also, first reinitialize vtable because it may have gotten out of synch | |
| 1702 // while the new class wasn't connected to the class hierarchy. | |
| 1703 Universe::flush_dependents_on(k); | |
| 1704 } | |
| 1705 | |
| 1706 | |
| 1707 // ---------------------------------------------------------------------------- | |
| 1708 // GC support | |
| 1709 | |
| 1710 // Following roots during mark-sweep is separated in two phases. | |
| 1711 // | |
| 1712 // The first phase follows preloaded classes and all other system | |
| 1713 // classes, since these will never get unloaded anyway. | |
| 1714 // | |
| 1715 // The second phase removes (unloads) unreachable classes from the | |
| 1716 // system dictionary and follows the remaining classes' contents. | |
| 1717 | |
| 1718 void SystemDictionary::always_strong_oops_do(OopClosure* blk) { | |
| 1719 // Follow preloaded classes/mirrors and system loader object | |
| 1720 blk->do_oop(&_java_system_loader); | |
| 1721 preloaded_oops_do(blk); | |
| 1722 always_strong_classes_do(blk); | |
| 1723 } | |
| 1724 | |
| 1725 | |
| 1726 void SystemDictionary::always_strong_classes_do(OopClosure* blk) { | |
| 1727 // Follow all system classes and temporary placeholders in dictionary | |
| 1728 dictionary()->always_strong_classes_do(blk); | |
| 1729 | |
| 1730 // Placeholders. These are *always* strong roots, as they | |
| 1731 // represent classes we're actively loading. | |
| 1732 placeholders_do(blk); | |
| 1733 | |
| 710 | 1734 // Visit extra methods |
| 1903 | 1735 invoke_method_table()->oops_do(blk); |
| 0 | 1736 } |
| 1737 | |
| 1738 | |
| 1739 void SystemDictionary::placeholders_do(OopClosure* blk) { | |
| 1740 placeholders()->oops_do(blk); | |
| 1741 } | |
| 1742 | |
| 1743 | |
| 1744 bool SystemDictionary::do_unloading(BoolObjectClosure* is_alive) { | |
| 1745 bool result = dictionary()->do_unloading(is_alive); | |
| 1746 constraints()->purge_loader_constraints(is_alive); | |
| 1747 resolution_errors()->purge_resolution_errors(is_alive); | |
| 1748 return result; | |
| 1749 } | |
| 1750 | |
| 1751 | |
| 1752 // The mirrors are scanned by shared_oops_do() which is | |
| 1753 // not called by oops_do(). In order to process oops in | |
| 1754 // a necessary order, shared_oops_do() is call by | |
| 1755 // Universe::oops_do(). | |
| 1756 void SystemDictionary::oops_do(OopClosure* f) { | |
| 1757 // Adjust preloaded classes and system loader object | |
| 1758 f->do_oop(&_java_system_loader); | |
| 1759 preloaded_oops_do(f); | |
| 1760 | |
| 1761 lazily_loaded_oops_do(f); | |
| 1762 | |
| 1763 // Adjust dictionary | |
| 1764 dictionary()->oops_do(f); | |
| 1765 | |
| 710 | 1766 // Visit extra methods |
| 1903 | 1767 invoke_method_table()->oops_do(f); |
| 710 | 1768 |
| 0 | 1769 // Partially loaded classes |
| 1770 placeholders()->oops_do(f); | |
| 1771 | |
| 1772 // Adjust constraint table | |
| 1773 constraints()->oops_do(f); | |
| 1774 | |
| 1775 // Adjust resolution error table | |
| 1776 resolution_errors()->oops_do(f); | |
| 1777 } | |
| 1778 | |
| 1779 | |
| 1780 void SystemDictionary::preloaded_oops_do(OopClosure* f) { | |
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1781 for (int k = (int)FIRST_WKID; k < (int)WKID_LIMIT; k++) { |
|
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1782 f->do_oop((oop*) &_well_known_klasses[k]); |
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1783 } |
| 0 | 1784 |
| 1785 { | |
| 1786 for (int i = 0; i < T_VOID+1; i++) { | |
| 1787 if (_box_klasses[i] != NULL) { | |
| 1788 assert(i >= T_BOOLEAN, "checking"); | |
| 1789 f->do_oop((oop*) &_box_klasses[i]); | |
| 1790 } | |
| 1791 } | |
| 1792 } | |
| 1793 | |
| 1794 // The basic type mirrors would have already been processed in | |
| 1795 // Universe::oops_do(), via a call to shared_oops_do(), so should | |
| 1796 // not be processed again. | |
| 1797 | |
| 1798 f->do_oop((oop*) &_system_loader_lock_obj); | |
| 1799 FilteredFieldsMap::klasses_oops_do(f); | |
| 1800 } | |
| 1801 | |
| 1802 void SystemDictionary::lazily_loaded_oops_do(OopClosure* f) { | |
| 1803 f->do_oop((oop*) &_abstract_ownable_synchronizer_klass); | |
| 1804 } | |
| 1805 | |
| 1806 // Just the classes from defining class loaders | |
| 1807 // Don't iterate over placeholders | |
| 1808 void SystemDictionary::classes_do(void f(klassOop)) { | |
| 1809 dictionary()->classes_do(f); | |
| 1810 } | |
| 1811 | |
| 1812 // Added for initialize_itable_for_klass | |
| 1813 // Just the classes from defining class loaders | |
| 1814 // Don't iterate over placeholders | |
| 1815 void SystemDictionary::classes_do(void f(klassOop, TRAPS), TRAPS) { | |
| 1816 dictionary()->classes_do(f, CHECK); | |
| 1817 } | |
| 1818 | |
| 1819 // All classes, and their class loaders | |
| 1820 // Don't iterate over placeholders | |
| 1821 void SystemDictionary::classes_do(void f(klassOop, oop)) { | |
| 1822 dictionary()->classes_do(f); | |
| 1823 } | |
| 1824 | |
| 1825 // All classes, and their class loaders | |
| 1826 // (added for helpers that use HandleMarks and ResourceMarks) | |
| 1827 // Don't iterate over placeholders | |
| 1828 void SystemDictionary::classes_do(void f(klassOop, oop, TRAPS), TRAPS) { | |
| 1829 dictionary()->classes_do(f, CHECK); | |
| 1830 } | |
| 1831 | |
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1832 void SystemDictionary::placeholders_do(void f(Symbol*, oop)) { |
| 0 | 1833 placeholders()->entries_do(f); |
| 1834 } | |
| 1835 | |
| 1836 void SystemDictionary::methods_do(void f(methodOop)) { | |
| 1837 dictionary()->methods_do(f); | |
| 1903 | 1838 invoke_method_table()->methods_do(f); |
| 0 | 1839 } |
| 1840 | |
| 1841 // ---------------------------------------------------------------------------- | |
| 1842 // Lazily load klasses | |
| 1843 | |
| 1844 void SystemDictionary::load_abstract_ownable_synchronizer_klass(TRAPS) { | |
| 1845 assert(JDK_Version::is_gte_jdk16x_version(), "Must be JDK 1.6 or later"); | |
| 1846 | |
| 1847 // if multiple threads calling this function, only one thread will load | |
| 1848 // the class. The other threads will find the loaded version once the | |
| 1849 // class is loaded. | |
| 1850 klassOop aos = _abstract_ownable_synchronizer_klass; | |
| 1851 if (aos == NULL) { | |
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1852 klassOop k = resolve_or_fail(vmSymbols::java_util_concurrent_locks_AbstractOwnableSynchronizer(), true, CHECK); |
| 0 | 1853 // Force a fence to prevent any read before the write completes |
| 1854 OrderAccess::fence(); | |
| 1855 _abstract_ownable_synchronizer_klass = k; | |
| 1856 } | |
| 1857 } | |
| 1858 | |
| 1859 // ---------------------------------------------------------------------------- | |
| 1860 // Initialization | |
| 1861 | |
| 1862 void SystemDictionary::initialize(TRAPS) { | |
| 1863 // Allocate arrays | |
| 1864 assert(dictionary() == NULL, | |
| 1865 "SystemDictionary should only be initialized once"); | |
| 1903 | 1866 _dictionary = new Dictionary(_nof_buckets); |
| 1867 _placeholders = new PlaceholderTable(_nof_buckets); | |
| 0 | 1868 _number_of_modifications = 0; |
| 1903 | 1869 _loader_constraints = new LoaderConstraintTable(_loader_constraint_size); |
| 1870 _resolution_errors = new ResolutionErrorTable(_resolution_error_size); | |
| 1871 _invoke_method_table = new SymbolPropertyTable(_invoke_method_size); | |
| 0 | 1872 |
| 1873 // Allocate private object used as system class loader lock | |
| 1874 _system_loader_lock_obj = oopFactory::new_system_objArray(0, CHECK); | |
| 1875 // Initialize basic classes | |
| 1876 initialize_preloaded_classes(CHECK); | |
| 1877 } | |
| 1878 | |
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1879 // Compact table of directions on the initialization of klasses: |
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1880 static const short wk_init_info[] = { |
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1881 #define WK_KLASS_INIT_INFO(name, symbol, option) \ |
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1882 ( ((int)vmSymbols::VM_SYMBOL_ENUM_NAME(symbol) \ |
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1883 << SystemDictionary::CEIL_LG_OPTION_LIMIT) \ |
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1884 | (int)SystemDictionary::option ), |
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1885 WK_KLASSES_DO(WK_KLASS_INIT_INFO) |
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1886 #undef WK_KLASS_INIT_INFO |
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1887 0 |
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1888 }; |
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1889 |
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1890 bool SystemDictionary::initialize_wk_klass(WKID id, int init_opt, TRAPS) { |
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1891 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1892 int info = wk_init_info[id - FIRST_WKID]; |
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1893 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1894 Symbol* symbol = vmSymbols::symbol_at((vmSymbols::SID)sid); |
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1895 klassOop* klassp = &_well_known_klasses[id]; |
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1896 bool must_load = (init_opt < SystemDictionary::Opt); |
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1897 bool try_load = true; |
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1898 if (init_opt == SystemDictionary::Opt_Kernel) { |
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1899 #ifndef KERNEL |
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1900 try_load = false; |
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1901 #endif //KERNEL |
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1902 } |
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1903 if ((*klassp) == NULL && try_load) { |
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1904 if (must_load) { |
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1905 (*klassp) = resolve_or_fail(symbol, true, CHECK_0); // load required class |
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1906 } else { |
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1907 (*klassp) = resolve_or_null(symbol, CHECK_0); // load optional klass |
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1908 } |
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1909 } |
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1910 return ((*klassp) != NULL); |
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1911 } |
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1912 |
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1913 void SystemDictionary::initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS) { |
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1914 assert((int)start_id <= (int)limit_id, "IDs are out of order!"); |
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1915 for (int id = (int)start_id; id < (int)limit_id; id++) { |
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1916 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1917 int info = wk_init_info[id - FIRST_WKID]; |
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1918 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1919 int opt = (info & right_n_bits(CEIL_LG_OPTION_LIMIT)); |
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1920 |
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1921 initialize_wk_klass((WKID)id, opt, CHECK); |
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1922 |
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1923 // Update limits, so find_well_known_klass can be very fast: |
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1924 Symbol* s = vmSymbols::symbol_at((vmSymbols::SID)sid); |
|
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1925 if (wk_klass_name_limits[1] == NULL) { |
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1926 wk_klass_name_limits[0] = wk_klass_name_limits[1] = s; |
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1927 } else if (wk_klass_name_limits[1] < s) { |
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1928 wk_klass_name_limits[1] = s; |
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1929 } else if (wk_klass_name_limits[0] > s) { |
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1930 wk_klass_name_limits[0] = s; |
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1931 } |
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1932 } |
| 710 | 1933 |
| 1934 // move the starting value forward to the limit: | |
| 1935 start_id = limit_id; | |
|
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1936 } |
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1937 |
| 0 | 1938 |
| 1939 void SystemDictionary::initialize_preloaded_classes(TRAPS) { | |
| 1142 | 1940 assert(WK_KLASS(Object_klass) == NULL, "preloaded classes should only be initialized once"); |
| 0 | 1941 // Preload commonly used klasses |
|
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1942 WKID scan = FIRST_WKID; |
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1943 // first do Object, String, Class |
| 1142 | 1944 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Class_klass), scan, CHECK); |
|
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1945 |
| 1142 | 1946 debug_only(instanceKlass::verify_class_klass_nonstatic_oop_maps(WK_KLASS(Class_klass))); |
|
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1947 |
| 0 | 1948 // Fixup mirrors for classes loaded before java.lang.Class. |
| 1949 // These calls iterate over the objects currently in the perm gen | |
| 1950 // so calling them at this point is matters (not before when there | |
| 1951 // are fewer objects and not later after there are more objects | |
| 1952 // in the perm gen. | |
| 1953 Universe::initialize_basic_type_mirrors(CHECK); | |
| 1954 Universe::fixup_mirrors(CHECK); | |
| 1955 | |
|
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1956 // do a bunch more: |
| 1142 | 1957 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Reference_klass), scan, CHECK); |
| 0 | 1958 |
| 1959 // Preload ref klasses and set reference types | |
| 1142 | 1960 instanceKlass::cast(WK_KLASS(Reference_klass))->set_reference_type(REF_OTHER); |
| 1961 instanceRefKlass::update_nonstatic_oop_maps(WK_KLASS(Reference_klass)); | |
| 0 | 1962 |
| 1142 | 1963 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(PhantomReference_klass), scan, CHECK); |
| 1964 instanceKlass::cast(WK_KLASS(SoftReference_klass))->set_reference_type(REF_SOFT); | |
| 1965 instanceKlass::cast(WK_KLASS(WeakReference_klass))->set_reference_type(REF_WEAK); | |
| 1966 instanceKlass::cast(WK_KLASS(FinalReference_klass))->set_reference_type(REF_FINAL); | |
| 1967 instanceKlass::cast(WK_KLASS(PhantomReference_klass))->set_reference_type(REF_PHANTOM); | |
|
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1968 |
| 710 | 1969 WKID meth_group_start = WK_KLASS_ENUM_NAME(MethodHandle_klass); |
| 1970 WKID meth_group_end = WK_KLASS_ENUM_NAME(WrongMethodTypeException_klass); | |
| 1971 initialize_wk_klasses_until(meth_group_start, scan, CHECK); | |
| 1972 if (EnableMethodHandles) { | |
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1973 initialize_wk_klasses_through(meth_group_end, scan, CHECK); |
| 710 | 1974 } |
| 1975 if (_well_known_klasses[meth_group_start] == NULL) { | |
| 1976 // Skip the rest of the method handle classes, if MethodHandle is not loaded. | |
| 1977 scan = WKID(meth_group_end+1); | |
| 1978 } | |
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1979 WKID indy_group_start = WK_KLASS_ENUM_NAME(Linkage_klass); |
|
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1980 WKID indy_group_end = WK_KLASS_ENUM_NAME(CallSite_klass); |
|
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1981 initialize_wk_klasses_until(indy_group_start, scan, CHECK); |
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1982 if (EnableInvokeDynamic) { |
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1983 initialize_wk_klasses_through(indy_group_end, scan, CHECK); |
|
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1984 } |
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1985 if (_well_known_klasses[indy_group_start] == NULL) { |
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1986 // Skip the rest of the dynamic typing classes, if Linkage is not loaded. |
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1987 scan = WKID(indy_group_end+1); |
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1988 } |
| 710 | 1989 |
|
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1990 initialize_wk_klasses_until(WKID_LIMIT, scan, CHECK); |
| 0 | 1991 |
| 1142 | 1992 _box_klasses[T_BOOLEAN] = WK_KLASS(Boolean_klass); |
| 1993 _box_klasses[T_CHAR] = WK_KLASS(Character_klass); | |
| 1994 _box_klasses[T_FLOAT] = WK_KLASS(Float_klass); | |
| 1995 _box_klasses[T_DOUBLE] = WK_KLASS(Double_klass); | |
| 1996 _box_klasses[T_BYTE] = WK_KLASS(Byte_klass); | |
| 1997 _box_klasses[T_SHORT] = WK_KLASS(Short_klass); | |
| 1998 _box_klasses[T_INT] = WK_KLASS(Integer_klass); | |
| 1999 _box_klasses[T_LONG] = WK_KLASS(Long_klass); | |
|
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2000 //_box_klasses[T_OBJECT] = WK_KLASS(object_klass); |
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2001 //_box_klasses[T_ARRAY] = WK_KLASS(object_klass); |
| 0 | 2002 |
| 2003 #ifdef KERNEL | |
|
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2004 if (sun_jkernel_DownloadManager_klass() == NULL) { |
| 0 | 2005 warning("Cannot find sun/jkernel/DownloadManager"); |
| 2006 } | |
| 2007 #endif // KERNEL | |
| 514 | 2008 |
| 0 | 2009 { // Compute whether we should use loadClass or loadClassInternal when loading classes. |
| 1142 | 2010 methodOop method = instanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::loadClassInternal_name(), vmSymbols::string_class_signature()); |
| 0 | 2011 _has_loadClassInternal = (method != NULL); |
| 2012 } | |
| 2013 { // Compute whether we should use checkPackageAccess or NOT | |
| 1142 | 2014 methodOop method = instanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::checkPackageAccess_name(), vmSymbols::class_protectiondomain_signature()); |
| 0 | 2015 _has_checkPackageAccess = (method != NULL); |
| 2016 } | |
| 2017 } | |
| 2018 | |
| 2019 // Tells if a given klass is a box (wrapper class, such as java.lang.Integer). | |
| 2020 // If so, returns the basic type it holds. If not, returns T_OBJECT. | |
| 2021 BasicType SystemDictionary::box_klass_type(klassOop k) { | |
| 2022 assert(k != NULL, ""); | |
| 2023 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { | |
| 2024 if (_box_klasses[i] == k) | |
| 2025 return (BasicType)i; | |
| 2026 } | |
| 2027 return T_OBJECT; | |
| 2028 } | |
| 2029 | |
|
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2030 KlassHandle SystemDictionaryHandles::box_klass(BasicType t) { |
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2031 if (t >= T_BOOLEAN && t <= T_VOID) |
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2032 return KlassHandle(&SystemDictionary::_box_klasses[t], true); |
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2033 else |
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2034 return KlassHandle(); |
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2035 } |
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2036 |
| 0 | 2037 // Constraints on class loaders. The details of the algorithm can be |
| 2038 // found in the OOPSLA'98 paper "Dynamic Class Loading in the Java | |
| 2039 // Virtual Machine" by Sheng Liang and Gilad Bracha. The basic idea is | |
| 2040 // that the system dictionary needs to maintain a set of contraints that | |
| 2041 // must be satisfied by all classes in the dictionary. | |
| 2042 // if defining is true, then LinkageError if already in systemDictionary | |
| 2043 // if initiating loader, then ok if instanceKlass matches existing entry | |
| 2044 | |
| 2045 void SystemDictionary::check_constraints(int d_index, unsigned int d_hash, | |
| 2046 instanceKlassHandle k, | |
| 2047 Handle class_loader, bool defining, | |
| 2048 TRAPS) { | |
| 2049 const char *linkage_error = NULL; | |
| 2050 { | |
|
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2051 Symbol* name = k->name(); |
| 0 | 2052 MutexLocker mu(SystemDictionary_lock, THREAD); |
| 2053 | |
| 2054 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 2055 if (check != (klassOop)NULL) { | |
| 2056 // if different instanceKlass - duplicate class definition, | |
| 2057 // else - ok, class loaded by a different thread in parallel, | |
| 2058 // we should only have found it if it was done loading and ok to use | |
| 2059 // system dictionary only holds instance classes, placeholders | |
| 2060 // also holds array classes | |
| 2061 | |
| 2062 assert(check->klass_part()->oop_is_instance(), "noninstance in systemdictionary"); | |
| 2063 if ((defining == true) || (k() != check)) { | |
| 2064 linkage_error = "loader (instance of %s): attempted duplicate class " | |
| 2065 "definition for name: \"%s\""; | |
| 2066 } else { | |
| 2067 return; | |
| 2068 } | |
| 2069 } | |
| 2070 | |
| 2071 #ifdef ASSERT | |
|
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2072 Symbol* ph_check = find_placeholder(name, class_loader); |
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2073 assert(ph_check == NULL || ph_check == name, "invalid symbol"); |
| 0 | 2074 #endif |
| 2075 | |
| 2076 if (linkage_error == NULL) { | |
| 2077 if (constraints()->check_or_update(k, class_loader, name) == false) { | |
| 2078 linkage_error = "loader constraint violation: loader (instance of %s)" | |
| 2079 " previously initiated loading for a different type with name \"%s\""; | |
| 2080 } | |
| 2081 } | |
| 2082 } | |
| 2083 | |
| 2084 // Throw error now if needed (cannot throw while holding | |
| 2085 // SystemDictionary_lock because of rank ordering) | |
| 2086 | |
| 2087 if (linkage_error) { | |
| 2088 ResourceMark rm(THREAD); | |
| 2089 const char* class_loader_name = loader_name(class_loader()); | |
| 2090 char* type_name = k->name()->as_C_string(); | |
| 2091 size_t buflen = strlen(linkage_error) + strlen(class_loader_name) + | |
| 2092 strlen(type_name); | |
| 2093 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
| 2094 jio_snprintf(buf, buflen, linkage_error, class_loader_name, type_name); | |
| 2095 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); | |
| 2096 } | |
| 2097 } | |
| 2098 | |
| 2099 | |
| 2100 // Update system dictionary - done after check_constraint and add_to_hierachy | |
| 2101 // have been called. | |
| 2102 void SystemDictionary::update_dictionary(int d_index, unsigned int d_hash, | |
| 2103 int p_index, unsigned int p_hash, | |
| 2104 instanceKlassHandle k, | |
| 2105 Handle class_loader, | |
| 2106 TRAPS) { | |
| 2107 // Compile_lock prevents systemDictionary updates during compilations | |
| 2108 assert_locked_or_safepoint(Compile_lock); | |
|
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2109 Symbol* name = k->name(); |
| 0 | 2110 |
| 2111 { | |
| 2112 MutexLocker mu1(SystemDictionary_lock, THREAD); | |
| 2113 | |
| 2114 // See whether biased locking is enabled and if so set it for this | |
| 2115 // klass. | |
| 2116 // Note that this must be done past the last potential blocking | |
| 2117 // point / safepoint. We enable biased locking lazily using a | |
| 2118 // VM_Operation to iterate the SystemDictionary and installing the | |
| 2119 // biasable mark word into each instanceKlass's prototype header. | |
| 2120 // To avoid race conditions where we accidentally miss enabling the | |
| 2121 // optimization for one class in the process of being added to the | |
| 2122 // dictionary, we must not safepoint after the test of | |
| 2123 // BiasedLocking::enabled(). | |
| 2124 if (UseBiasedLocking && BiasedLocking::enabled()) { | |
| 2125 // Set biased locking bit for all loaded classes; it will be | |
| 2126 // cleared if revocation occurs too often for this type | |
| 2127 // NOTE that we must only do this when the class is initally | |
| 2128 // defined, not each time it is referenced from a new class loader | |
| 2129 if (k->class_loader() == class_loader()) { | |
| 2130 k->set_prototype_header(markOopDesc::biased_locking_prototype()); | |
| 2131 } | |
| 2132 } | |
| 2133 | |
| 2134 // Check for a placeholder. If there, remove it and make a | |
| 2135 // new system dictionary entry. | |
| 2136 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
| 2137 klassOop sd_check = find_class(d_index, d_hash, name, class_loader); | |
| 2138 if (sd_check == NULL) { | |
| 2139 dictionary()->add_klass(name, class_loader, k); | |
| 2140 notice_modification(); | |
| 2141 } | |
| 2142 #ifdef ASSERT | |
| 2143 sd_check = find_class(d_index, d_hash, name, class_loader); | |
| 2144 assert (sd_check != NULL, "should have entry in system dictionary"); | |
| 2145 // Changed to allow PH to remain to complete class circularity checking | |
| 2146 // while only one thread can define a class at one time, multiple | |
| 2147 // classes can resolve the superclass for a class at one time, | |
| 2148 // and the placeholder is used to track that | |
|
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2149 // Symbol* ph_check = find_placeholder(name, class_loader); |
| 0 | 2150 // assert (ph_check == NULL, "should not have a placeholder entry"); |
| 2151 #endif | |
| 2152 SystemDictionary_lock->notify_all(); | |
| 2153 } | |
| 2154 } | |
| 2155 | |
| 2156 | |
|
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2157 // Try to find a class name using the loader constraints. The |
|
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2158 // loader constraints might know about a class that isn't fully loaded |
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2159 // yet and these will be ignored. |
| 0 | 2160 klassOop SystemDictionary::find_constrained_instance_or_array_klass( |
|
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2161 Symbol* class_name, Handle class_loader, TRAPS) { |
| 0 | 2162 |
| 2163 // First see if it has been loaded directly. | |
| 2164 // Force the protection domain to be null. (This removes protection checks.) | |
| 2165 Handle no_protection_domain; | |
| 2166 klassOop klass = find_instance_or_array_klass(class_name, class_loader, | |
| 2167 no_protection_domain, CHECK_NULL); | |
| 2168 if (klass != NULL) | |
| 2169 return klass; | |
| 2170 | |
| 2171 // Now look to see if it has been loaded elsewhere, and is subject to | |
| 2172 // a loader constraint that would require this loader to return the | |
| 2173 // klass that is already loaded. | |
|
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2174 if (FieldType::is_array(class_name)) { |
| 1336 | 2175 // For array classes, their klassOops are not kept in the |
| 2176 // constraint table. The element klassOops are. | |
|
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2177 FieldArrayInfo fd; |
|
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2178 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
| 0 | 2179 if (t != T_OBJECT) { |
| 2180 klass = Universe::typeArrayKlassObj(t); | |
| 2181 } else { | |
| 2182 MutexLocker mu(SystemDictionary_lock, THREAD); | |
|
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2183 klass = constraints()->find_constrained_klass(fd.object_key(), class_loader); |
| 0 | 2184 } |
| 1336 | 2185 // If element class already loaded, allocate array klass |
| 0 | 2186 if (klass != NULL) { |
|
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2187 klass = Klass::cast(klass)->array_klass_or_null(fd.dimension()); |
| 0 | 2188 } |
| 2189 } else { | |
| 2190 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 2191 // Non-array classes are easy: simply check the constraint table. | |
| 2192 klass = constraints()->find_constrained_klass(class_name, class_loader); | |
| 2193 } | |
| 2194 | |
| 2195 return klass; | |
| 2196 } | |
| 2197 | |
| 2198 | |
|
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2199 bool SystemDictionary::add_loader_constraint(Symbol* class_name, |
| 0 | 2200 Handle class_loader1, |
| 2201 Handle class_loader2, | |
| 2202 Thread* THREAD) { | |
|
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2203 Symbol* constraint_name = NULL; |
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2204 if (!FieldType::is_array(class_name)) { |
| 1336 | 2205 constraint_name = class_name; |
| 2206 } else { | |
| 2207 // For array classes, their klassOops are not kept in the | |
| 2208 // constraint table. The element classes are. | |
|
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2209 FieldArrayInfo fd; |
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2210 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(false)); |
| 1336 | 2211 // primitive types always pass |
| 2212 if (t != T_OBJECT) { | |
| 2213 return true; | |
| 2214 } else { | |
|
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2215 constraint_name = fd.object_key(); |
| 1336 | 2216 } |
| 2217 } | |
| 2218 unsigned int d_hash1 = dictionary()->compute_hash(constraint_name, class_loader1); | |
| 0 | 2219 int d_index1 = dictionary()->hash_to_index(d_hash1); |
| 2220 | |
| 1336 | 2221 unsigned int d_hash2 = dictionary()->compute_hash(constraint_name, class_loader2); |
| 0 | 2222 int d_index2 = dictionary()->hash_to_index(d_hash2); |
| 2223 { | |
| 1336 | 2224 MutexLocker mu_s(SystemDictionary_lock, THREAD); |
| 0 | 2225 |
| 1336 | 2226 // Better never do a GC while we're holding these oops |
| 2227 No_Safepoint_Verifier nosafepoint; | |
| 0 | 2228 |
| 1336 | 2229 klassOop klass1 = find_class(d_index1, d_hash1, constraint_name, class_loader1); |
| 2230 klassOop klass2 = find_class(d_index2, d_hash2, constraint_name, class_loader2); | |
| 2231 return constraints()->add_entry(constraint_name, klass1, class_loader1, | |
| 2232 klass2, class_loader2); | |
| 0 | 2233 } |
| 2234 } | |
| 2235 | |
| 2236 // Add entry to resolution error table to record the error when the first | |
| 2237 // attempt to resolve a reference to a class has failed. | |
|
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2238 void SystemDictionary::add_resolution_error(constantPoolHandle pool, int which, Symbol* error) { |
| 0 | 2239 unsigned int hash = resolution_errors()->compute_hash(pool, which); |
| 2240 int index = resolution_errors()->hash_to_index(hash); | |
| 2241 { | |
| 2242 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
| 2243 resolution_errors()->add_entry(index, hash, pool, which, error); | |
| 2244 } | |
| 2245 } | |
| 2246 | |
| 2247 // Lookup resolution error table. Returns error if found, otherwise NULL. | |
|
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2248 Symbol* SystemDictionary::find_resolution_error(constantPoolHandle pool, int which) { |
| 0 | 2249 unsigned int hash = resolution_errors()->compute_hash(pool, which); |
| 2250 int index = resolution_errors()->hash_to_index(hash); | |
| 2251 { | |
| 2252 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
| 2253 ResolutionErrorEntry* entry = resolution_errors()->find_entry(index, hash, pool, which); | |
|
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2254 return (entry != NULL) ? entry->error() : (Symbol*)NULL; |
| 0 | 2255 } |
| 2256 } | |
| 2257 | |
| 2258 | |
|
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2259 // Signature constraints ensure that callers and callees agree about |
|
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2260 // the meaning of type names in their signatures. This routine is the |
|
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2261 // intake for constraints. It collects them from several places: |
|
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2262 // |
|
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2263 // * LinkResolver::resolve_method (if check_access is true) requires |
|
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2264 // that the resolving class (the caller) and the defining class of |
|
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2265 // the resolved method (the callee) agree on each type in the |
|
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2266 // method's signature. |
|
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2267 // |
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2268 // * LinkResolver::resolve_interface_method performs exactly the same |
|
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2269 // checks. |
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2270 // |
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2271 // * LinkResolver::resolve_field requires that the constant pool |
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2272 // attempting to link to a field agree with the field's defining |
|
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2273 // class about the type of the field signature. |
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2274 // |
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2275 // * klassVtable::initialize_vtable requires that, when a class |
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2276 // overrides a vtable entry allocated by a superclass, that the |
|
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2277 // overriding method (i.e., the callee) agree with the superclass |
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2278 // on each type in the method's signature. |
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2279 // |
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2280 // * klassItable::initialize_itable requires that, when a class fills |
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2281 // in its itables, for each non-abstract method installed in an |
|
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2282 // itable, the method (i.e., the callee) agree with the interface |
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2283 // on each type in the method's signature. |
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2284 // |
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2285 // All those methods have a boolean (check_access, checkconstraints) |
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2286 // which turns off the checks. This is used from specialized contexts |
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2287 // such as bootstrapping, dumping, and debugging. |
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2288 // |
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2289 // No direct constraint is placed between the class and its |
|
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2290 // supertypes. Constraints are only placed along linked relations |
|
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2291 // between callers and callees. When a method overrides or implements |
|
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2292 // an abstract method in a supertype (superclass or interface), the |
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2293 // constraints are placed as if the supertype were the caller to the |
|
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2294 // overriding method. (This works well, since callers to the |
|
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2295 // supertype have already established agreement between themselves and |
|
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2296 // the supertype.) As a result of all this, a class can disagree with |
|
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2297 // its supertype about the meaning of a type name, as long as that |
|
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2298 // class neither calls a relevant method of the supertype, nor is |
|
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2299 // called (perhaps via an override) from the supertype. |
|
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2300 // |
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2301 // |
|
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2302 // SystemDictionary::check_signature_loaders(sig, l1, l2) |
|
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2303 // |
| 0 | 2304 // Make sure all class components (including arrays) in the given |
| 2305 // signature will be resolved to the same class in both loaders. | |
| 2306 // Returns the name of the type that failed a loader constraint check, or | |
| 2307 // NULL if no constraint failed. The returned C string needs cleaning up | |
|
665
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2308 // with a ResourceMark in the caller. No exception except OOME is thrown. |
| 1336 | 2309 // Arrays are not added to the loader constraint table, their elements are. |
|
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|
2310 char* SystemDictionary::check_signature_loaders(Symbol* signature, |
| 0 | 2311 Handle loader1, Handle loader2, |
| 2312 bool is_method, TRAPS) { | |
| 2313 // Nothing to do if loaders are the same. | |
| 2314 if (loader1() == loader2()) { | |
| 2315 return NULL; | |
| 2316 } | |
| 2317 | |
|
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2318 ResourceMark rm(THREAD); |
| 0 | 2319 SignatureStream sig_strm(signature, is_method); |
| 2320 while (!sig_strm.is_done()) { | |
| 2321 if (sig_strm.is_object()) { | |
|
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2322 Symbol* s = sig_strm.as_symbol(CHECK_NULL); |
|
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2323 Symbol* sig = s; |
| 0 | 2324 if (!add_loader_constraint(sig, loader1, loader2, THREAD)) { |
|
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2325 return sig->as_C_string(); |
| 0 | 2326 } |
| 2327 } | |
| 2328 sig_strm.next(); | |
| 2329 } | |
| 2330 return NULL; | |
| 2331 } | |
| 2332 | |
| 2333 | |
|
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2334 methodOop SystemDictionary::find_method_handle_invoke(Symbol* name, |
|
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|
2335 Symbol* signature, |
|
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2336 KlassHandle accessing_klass, |
| 710 | 2337 TRAPS) { |
| 2338 if (!EnableMethodHandles) return NULL; | |
|
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2339 vmSymbols::SID name_id = vmSymbols::find_sid(name); |
|
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2340 assert(name_id != vmSymbols::NO_SID, "must be a known name"); |
|
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2341 unsigned int hash = invoke_method_table()->compute_hash(signature, name_id); |
| 710 | 2342 int index = invoke_method_table()->hash_to_index(hash); |
|
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2343 SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, name_id); |
|
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2344 methodHandle non_cached_result; |
| 710 | 2345 if (spe == NULL || spe->property_oop() == NULL) { |
|
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|
2346 spe = NULL; |
| 710 | 2347 // Must create lots of stuff here, but outside of the SystemDictionary lock. |
|
1135
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|
2348 if (THREAD->is_Compiler_thread()) |
|
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|
2349 return NULL; // do not attempt from within compiler |
|
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2350 bool for_invokeGeneric = (name_id == vmSymbols::VM_SYMBOL_ENUM_NAME(invokeGeneric_name)); |
|
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2351 bool found_on_bcp = false; |
|
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2352 Handle mt = find_method_handle_type(signature, accessing_klass, |
|
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|
2353 for_invokeGeneric, |
|
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|
2354 found_on_bcp, CHECK_NULL); |
| 710 | 2355 KlassHandle mh_klass = SystemDictionaryHandles::MethodHandle_klass(); |
|
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|
2356 methodHandle m = methodOopDesc::make_invoke_method(mh_klass, name, signature, |
| 710 | 2357 mt, CHECK_NULL); |
| 2358 // Now grab the lock. We might have to throw away the new method, | |
| 2359 // if a racing thread has managed to install one at the same time. | |
|
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|
2360 if (found_on_bcp) { |
| 710 | 2361 MutexLocker ml(SystemDictionary_lock, Thread::current()); |
|
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|
2362 spe = invoke_method_table()->find_entry(index, hash, signature, name_id); |
| 710 | 2363 if (spe == NULL) |
|
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|
2364 spe = invoke_method_table()->add_entry(index, hash, signature, name_id); |
| 710 | 2365 if (spe->property_oop() == NULL) |
| 2366 spe->set_property_oop(m()); | |
|
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|
2367 } else { |
|
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|
2368 non_cached_result = m; |
| 710 | 2369 } |
| 2370 } | |
|
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|
2371 if (spe != NULL && spe->property_oop() != NULL) { |
|
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|
2372 assert(spe->property_oop()->is_method(), ""); |
|
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|
2373 return (methodOop) spe->property_oop(); |
|
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|
2374 } else { |
|
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|
2375 return non_cached_result(); |
|
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|
2376 } |
| 710 | 2377 } |
| 2378 | |
| 2379 // Ask Java code to find or construct a java.dyn.MethodType for the given | |
| 2380 // signature, as interpreted relative to the given class loader. | |
| 2381 // Because of class loader constraints, all method handle usage must be | |
| 2382 // consistent with this loader. | |
|
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|
2383 Handle SystemDictionary::find_method_handle_type(Symbol* signature, |
|
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|
2384 KlassHandle accessing_klass, |
|
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|
2385 bool for_invokeGeneric, |
|
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|
2386 bool& return_bcp_flag, |
|
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|
2387 TRAPS) { |
|
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|
2388 Handle class_loader, protection_domain; |
|
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|
2389 bool is_on_bcp = true; // keep this true as long as we can materialize from the boot classloader |
| 710 | 2390 Handle empty; |
|
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|
2391 int npts = ArgumentCount(signature).size(); |
| 1142 | 2392 objArrayHandle pts = oopFactory::new_objArray(SystemDictionary::Class_klass(), npts, CHECK_(empty)); |
| 710 | 2393 int arg = 0; |
| 2394 Handle rt; // the return type from the signature | |
|
2177
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|
2395 ResourceMark rm(THREAD); |
|
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|
2396 for (SignatureStream ss(signature); !ss.is_done(); ss.next()) { |
|
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|
2397 oop mirror = NULL; |
|
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|
2398 if (is_on_bcp) { |
|
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|
2399 mirror = ss.as_java_mirror(class_loader, protection_domain, |
|
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|
2400 SignatureStream::ReturnNull, CHECK_(empty)); |
|
2ffde6cfe049
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|
2401 if (mirror == NULL) { |
|
2ffde6cfe049
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|
2402 // fall back from BCP to accessing_klass |
|
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|
2403 if (accessing_klass.not_null()) { |
|
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|
2404 class_loader = Handle(THREAD, instanceKlass::cast(accessing_klass())->class_loader()); |
|
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|
2405 protection_domain = Handle(THREAD, instanceKlass::cast(accessing_klass())->protection_domain()); |
|
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|
2406 } |
|
2ffde6cfe049
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|
2407 is_on_bcp = false; |
|
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|
2408 } |
|
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|
2409 } |
|
2ffde6cfe049
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|
2410 if (!is_on_bcp) { |
|
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|
2411 // Resolve, throwing a real error if it doesn't work. |
|
2ffde6cfe049
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|
2412 mirror = ss.as_java_mirror(class_loader, protection_domain, |
|
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|
2413 SignatureStream::NCDFError, CHECK_(empty)); |
| 710 | 2414 } |
| 2415 if (ss.at_return_type()) | |
| 2416 rt = Handle(THREAD, mirror); | |
| 2417 else | |
| 2418 pts->obj_at_put(arg++, mirror); | |
|
1508
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|
2419 // Check accessibility. |
|
2ffde6cfe049
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|
2420 if (ss.is_object() && accessing_klass.not_null()) { |
|
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|
2421 klassOop sel_klass = java_lang_Class::as_klassOop(mirror); |
|
2ffde6cfe049
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|
2422 // Emulate constantPoolOopDesc::verify_constant_pool_resolve. |
|
2ffde6cfe049
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|
2423 if (Klass::cast(sel_klass)->oop_is_objArray()) |
|
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|
2424 sel_klass = objArrayKlass::cast(sel_klass)->bottom_klass(); |
|
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|
2425 if (Klass::cast(sel_klass)->oop_is_instance()) { |
|
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|
2426 KlassHandle sel_kh(THREAD, sel_klass); |
|
2ffde6cfe049
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|
2427 LinkResolver::check_klass_accessability(accessing_klass, sel_kh, CHECK_(empty)); |
|
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|
2428 } |
|
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|
2429 } |
| 710 | 2430 } |
| 2431 assert(arg == npts, ""); | |
| 2432 | |
|
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|
2433 // call sun.dyn.MethodHandleNatives::findMethodType(Class rt, Class[] pts) -> MethodType |
| 710 | 2434 JavaCallArguments args(Handle(THREAD, rt())); |
| 2435 args.push_oop(pts()); | |
| 2436 JavaValue result(T_OBJECT); | |
| 2437 JavaCalls::call_static(&result, | |
|
1507
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1339
diff
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|
2438 SystemDictionary::MethodHandleNatives_klass(), |
|
cd5dbf694d45
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1339
diff
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|
2439 vmSymbols::findMethodHandleType_name(), |
|
cd5dbf694d45
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1339
diff
changeset
|
2440 vmSymbols::findMethodHandleType_signature(), |
| 710 | 2441 &args, CHECK_(empty)); |
|
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|
2442 Handle method_type(THREAD, (oop) result.get_jobject()); |
|
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|
2443 |
|
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|
2444 if (for_invokeGeneric) { |
|
d257356e35f0
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1660
diff
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|
2445 // call sun.dyn.MethodHandleNatives::notifyGenericMethodType(MethodType) -> void |
|
d257356e35f0
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1660
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|
2446 JavaCallArguments args(Handle(THREAD, method_type())); |
|
d257356e35f0
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diff
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|
2447 JavaValue no_result(T_VOID); |
|
d257356e35f0
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changeset
|
2448 JavaCalls::call_static(&no_result, |
|
d257356e35f0
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1660
diff
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|
2449 SystemDictionary::MethodHandleNatives_klass(), |
|
d257356e35f0
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1660
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changeset
|
2450 vmSymbols::notifyGenericMethodType_name(), |
|
d257356e35f0
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1660
diff
changeset
|
2451 vmSymbols::notifyGenericMethodType_signature(), |
|
d257356e35f0
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1660
diff
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|
2452 &args, THREAD); |
|
d257356e35f0
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|
2453 if (HAS_PENDING_EXCEPTION) { |
|
d257356e35f0
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1660
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changeset
|
2454 // If the notification fails, just kill it. |
|
d257356e35f0
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1660
diff
changeset
|
2455 CLEAR_PENDING_EXCEPTION; |
|
d257356e35f0
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jrose
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1660
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|
2456 } |
|
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|
2457 } |
|
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diff
changeset
|
2458 |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
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1507
diff
changeset
|
2459 // report back to the caller with the MethodType and the "on_bcp" flag |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
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1507
diff
changeset
|
2460 return_bcp_flag = is_on_bcp; |
|
1793
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
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1660
diff
changeset
|
2461 return method_type; |
| 710 | 2462 } |
| 2463 | |
| 1602 | 2464 // Ask Java code to find or construct a method handle constant. |
| 2465 Handle SystemDictionary::link_method_handle_constant(KlassHandle caller, | |
| 2466 int ref_kind, //e.g., JVM_REF_invokeVirtual | |
| 2467 KlassHandle callee, | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2001
diff
changeset
|
2468 Symbol* name_sym, |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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diff
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|
2469 Symbol* signature, |
| 1602 | 2470 TRAPS) { |
| 2471 Handle empty; | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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2001
diff
changeset
|
2472 Handle name = java_lang_String::create_from_symbol(name_sym, CHECK_(empty)); |
| 1602 | 2473 Handle type; |
| 2474 if (signature->utf8_length() > 0 && signature->byte_at(0) == '(') { | |
| 2475 bool ignore_is_on_bcp = false; | |
|
1793
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents:
1660
diff
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|
2476 type = find_method_handle_type(signature, caller, false, ignore_is_on_bcp, CHECK_(empty)); |
| 1602 | 2477 } else { |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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2001
diff
changeset
|
2478 ResourceMark rm(THREAD); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2001
diff
changeset
|
2479 SignatureStream ss(signature, false); |
| 1602 | 2480 if (!ss.is_done()) { |
| 2481 oop mirror = ss.as_java_mirror(caller->class_loader(), caller->protection_domain(), | |
| 2482 SignatureStream::NCDFError, CHECK_(empty)); | |
| 2483 type = Handle(THREAD, mirror); | |
| 2484 ss.next(); | |
| 2485 if (!ss.is_done()) type = Handle(); // error! | |
| 2486 } | |
| 2487 } | |
| 2488 if (type.is_null()) { | |
| 2489 THROW_MSG_(vmSymbols::java_lang_LinkageError(), "bad signature", empty); | |
| 2490 } | |
| 2491 | |
| 2492 // call sun.dyn.MethodHandleNatives::linkMethodHandleConstant(Class caller, int refKind, Class callee, String name, Object type) -> MethodHandle | |
| 2493 JavaCallArguments args; | |
| 2494 args.push_oop(caller->java_mirror()); // the referring class | |
| 2495 args.push_int(ref_kind); | |
| 2496 args.push_oop(callee->java_mirror()); // the target class | |
| 2497 args.push_oop(name()); | |
| 2498 args.push_oop(type()); | |
| 2499 JavaValue result(T_OBJECT); | |
| 2500 JavaCalls::call_static(&result, | |
| 2501 SystemDictionary::MethodHandleNatives_klass(), | |
| 2502 vmSymbols::linkMethodHandleConstant_name(), | |
| 2503 vmSymbols::linkMethodHandleConstant_signature(), | |
| 2504 &args, CHECK_(empty)); | |
| 2505 return Handle(THREAD, (oop) result.get_jobject()); | |
| 2506 } | |
| 710 | 2507 |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2508 // Ask Java code to find or construct a java.dyn.CallSite for the given |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
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710
diff
changeset
|
2509 // name and signature, as interpreted relative to the given class loader. |
|
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
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|
2510 Handle SystemDictionary::make_dynamic_call_site(Handle bootstrap_method, |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2511 Symbol* name, |
|
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2512 methodHandle signature_invoker, |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2513 Handle info, |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2514 methodHandle caller_method, |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2515 int caller_bci, |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2516 TRAPS) { |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2517 Handle empty; |
|
1660
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2518 guarantee(bootstrap_method.not_null() && |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2519 java_dyn_MethodHandle::is_instance(bootstrap_method()), |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2520 "caller must supply a valid BSM"); |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
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|
2521 |
|
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2522 Handle caller_mname = MethodHandles::new_MemberName(CHECK_(empty)); |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2523 MethodHandles::init_MemberName(caller_mname(), caller_method()); |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2524 |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2525 // call sun.dyn.MethodHandleNatives::makeDynamicCallSite(bootm, name, mtype, info, caller_mname, caller_pos) |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2526 oop name_str_oop = StringTable::intern(name, CHECK_(empty)); // not a handle! |
|
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2527 JavaCallArguments args(Handle(THREAD, bootstrap_method())); |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2528 args.push_oop(name_str_oop); |
|
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2529 args.push_oop(signature_invoker->method_handle_type()); |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2530 args.push_oop(info()); |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2531 args.push_oop(caller_mname()); |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2532 args.push_int(caller_bci); |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2533 JavaValue result(T_OBJECT); |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2534 JavaCalls::call_static(&result, |
|
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2535 SystemDictionary::MethodHandleNatives_klass(), |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2536 vmSymbols::makeDynamicCallSite_name(), |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2537 vmSymbols::makeDynamicCallSite_signature(), |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2538 &args, CHECK_(empty)); |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2539 oop call_site_oop = (oop) result.get_jobject(); |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
875
diff
changeset
|
2540 assert(call_site_oop->is_oop() |
|
1059
389049f3f393
6858164: invokedynamic code needs some cleanup (post-6655638)
jrose
parents:
1039
diff
changeset
|
2541 /*&& java_dyn_CallSite::is_instance(call_site_oop)*/, "must be sane"); |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2542 if (TraceMethodHandles) { |
|
1059
389049f3f393
6858164: invokedynamic code needs some cleanup (post-6655638)
jrose
parents:
1039
diff
changeset
|
2543 #ifndef PRODUCT |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2544 tty->print_cr("Linked invokedynamic bci=%d site="INTPTR_FORMAT":", caller_bci, call_site_oop); |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2545 call_site_oop->print(); |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2546 tty->cr(); |
|
1059
389049f3f393
6858164: invokedynamic code needs some cleanup (post-6655638)
jrose
parents:
1039
diff
changeset
|
2547 #endif //PRODUCT |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2548 } |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2549 return call_site_oop; |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2550 } |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2551 |
|
1660
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2552 Handle SystemDictionary::find_bootstrap_method(methodHandle caller_method, int caller_bci, |
|
1913
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2553 int cache_index, |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2554 Handle& argument_info_result, |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2555 TRAPS) { |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2556 Handle empty; |
|
1660
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2557 |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2558 constantPoolHandle pool; |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2559 { |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2560 klassOop caller = caller_method->method_holder(); |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2561 if (!Klass::cast(caller)->oop_is_instance()) return empty; |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2562 pool = constantPoolHandle(THREAD, instanceKlass::cast(caller)->constants()); |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2563 } |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2564 |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2565 int constant_pool_index = pool->cache()->entry_at(cache_index)->constant_pool_index(); |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2566 constantTag tag = pool->tag_at(constant_pool_index); |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2567 |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2568 if (tag.is_invoke_dynamic()) { |
|
1913
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2569 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments |
|
1660
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2570 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry. |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2571 int bsm_index = pool->invoke_dynamic_bootstrap_method_ref_index_at(constant_pool_index); |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2572 if (bsm_index != 0) { |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2573 int bsm_index_in_cache = pool->cache()->entry_at(cache_index)->bootstrap_method_index_in_cache(); |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2574 DEBUG_ONLY(int bsm_index_2 = pool->cache()->entry_at(bsm_index_in_cache)->constant_pool_index()); |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2575 assert(bsm_index == bsm_index_2, "BSM constant lifted to cache"); |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2576 if (TraceMethodHandles) { |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2577 tty->print_cr("resolving bootstrap method for "PTR_FORMAT" at %d at cache[%d]CP[%d]...", |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2578 (intptr_t) caller_method(), caller_bci, cache_index, constant_pool_index); |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2579 } |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2580 oop bsm_oop = pool->resolve_cached_constant_at(bsm_index_in_cache, CHECK_(empty)); |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2581 if (TraceMethodHandles) { |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2582 tty->print_cr("bootstrap method for "PTR_FORMAT" at %d retrieved as "PTR_FORMAT":", |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2583 (intptr_t) caller_method(), caller_bci, (intptr_t) bsm_oop); |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2584 } |
|
1913
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2585 assert(bsm_oop->is_oop(), "must be sane"); |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2586 // caller must verify that it is of type MethodHandle |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2587 Handle bsm(THREAD, bsm_oop); |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2588 bsm_oop = NULL; // safety |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2589 |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2590 // Extract the optional static arguments. |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2591 Handle argument_info; // either null, or one arg, or Object[]{arg...} |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2592 int argc = pool->invoke_dynamic_argument_count_at(constant_pool_index); |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2593 if (TraceInvokeDynamic) { |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2594 tty->print_cr("find_bootstrap_method: [%d/%d] CONSTANT_InvokeDynamic: %d[%d]", |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2595 constant_pool_index, cache_index, bsm_index, argc); |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2596 } |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2597 if (argc > 0) { |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2598 objArrayHandle arg_array; |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2599 if (argc > 1) { |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2600 objArrayOop arg_array_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), argc, CHECK_(empty)); |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2601 arg_array = objArrayHandle(THREAD, arg_array_oop); |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2602 argument_info = arg_array; |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2603 } |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2604 for (int arg_i = 0; arg_i < argc; arg_i++) { |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2605 int arg_index = pool->invoke_dynamic_argument_index_at(constant_pool_index, arg_i); |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2606 oop arg_oop = pool->resolve_possibly_cached_constant_at(arg_index, CHECK_(empty)); |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2607 if (arg_array.is_null()) { |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2608 argument_info = Handle(THREAD, arg_oop); |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
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1903
diff
changeset
|
2609 } else { |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2610 arg_array->obj_at_put(arg_i, arg_oop); |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
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|
2611 } |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2612 } |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2613 } |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2614 |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
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diff
changeset
|
2615 argument_info_result = argument_info; // return argument_info to caller |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2616 return bsm; |
|
1660
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2617 } |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2618 // else null BSM; fall through |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2619 } else if (tag.is_name_and_type()) { |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
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diff
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|
2620 // JSR 292 EDR does not have JVM_CONSTANT_InvokeDynamic |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
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|
2621 // a bare name&type defaults its BSM to null, so fall through... |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
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|
2622 } else { |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2623 ShouldNotReachHere(); // verifier does not allow this |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2624 } |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2625 |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2626 // Fall through to pick up the per-class bootstrap method. |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2627 // This mechanism may go away in the PFD. |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2628 assert(AllowTransitionalJSR292, "else the verifier should have stopped us already"); |
|
1913
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2629 argument_info_result = empty; // return no argument_info to caller |
|
1660
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2630 oop bsm_oop = instanceKlass::cast(caller_method->method_holder())->bootstrap_method(); |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2631 if (bsm_oop != NULL) { |
|
1059
389049f3f393
6858164: invokedynamic code needs some cleanup (post-6655638)
jrose
parents:
1039
diff
changeset
|
2632 if (TraceMethodHandles) { |
|
1660
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2633 tty->print_cr("bootstrap method for "PTR_FORMAT" registered as "PTR_FORMAT":", |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2634 (intptr_t) caller_method(), (intptr_t) bsm_oop); |
|
1059
389049f3f393
6858164: invokedynamic code needs some cleanup (post-6655638)
jrose
parents:
1039
diff
changeset
|
2635 } |
|
1913
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2636 assert(bsm_oop->is_oop(), "must be sane"); |
|
1660
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2637 return Handle(THREAD, bsm_oop); |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2638 } |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2639 |
|
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2640 return empty; |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2641 } |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2642 |
| 0 | 2643 // Since the identity hash code for symbols changes when the symbols are |
| 2644 // moved from the regular perm gen (hash in the mark word) to the shared | |
| 2645 // spaces (hash is the address), the classes loaded into the dictionary | |
| 2646 // may be in the wrong buckets. | |
| 2647 | |
| 2648 void SystemDictionary::reorder_dictionary() { | |
| 2649 dictionary()->reorder_dictionary(); | |
| 2650 } | |
| 2651 | |
| 2652 | |
| 2653 void SystemDictionary::copy_buckets(char** top, char* end) { | |
| 2654 dictionary()->copy_buckets(top, end); | |
| 2655 } | |
| 2656 | |
| 2657 | |
| 2658 void SystemDictionary::copy_table(char** top, char* end) { | |
| 2659 dictionary()->copy_table(top, end); | |
| 2660 } | |
| 2661 | |
| 2662 | |
| 2663 void SystemDictionary::reverse() { | |
| 2664 dictionary()->reverse(); | |
| 2665 } | |
| 2666 | |
| 2667 int SystemDictionary::number_of_classes() { | |
| 2668 return dictionary()->number_of_entries(); | |
| 2669 } | |
| 2670 | |
| 2671 | |
| 2672 // ---------------------------------------------------------------------------- | |
| 2673 #ifndef PRODUCT | |
| 2674 | |
| 2675 void SystemDictionary::print() { | |
| 2676 dictionary()->print(); | |
| 2677 | |
| 2678 // Placeholders | |
| 2679 GCMutexLocker mu(SystemDictionary_lock); | |
| 2680 placeholders()->print(); | |
| 2681 | |
| 2682 // loader constraints - print under SD_lock | |
| 2683 constraints()->print(); | |
| 2684 } | |
| 2685 | |
| 2686 #endif | |
| 2687 | |
| 2688 void SystemDictionary::verify() { | |
| 2689 guarantee(dictionary() != NULL, "Verify of system dictionary failed"); | |
| 2690 guarantee(constraints() != NULL, | |
| 2691 "Verify of loader constraints failed"); | |
| 2692 guarantee(dictionary()->number_of_entries() >= 0 && | |
| 2693 placeholders()->number_of_entries() >= 0, | |
| 2694 "Verify of system dictionary failed"); | |
| 2695 | |
| 2696 // Verify dictionary | |
| 2697 dictionary()->verify(); | |
| 2698 | |
| 2699 GCMutexLocker mu(SystemDictionary_lock); | |
| 2700 placeholders()->verify(); | |
| 2701 | |
| 2702 // Verify constraint table | |
| 2703 guarantee(constraints() != NULL, "Verify of loader constraints failed"); | |
|
1258
38836cf1d8d2
6920977: G1: guarantee(k == probe->klass(),"klass should be in dictionary") fails
tonyp
parents:
1142
diff
changeset
|
2704 constraints()->verify(dictionary(), placeholders()); |
| 0 | 2705 } |
| 2706 | |
| 2707 | |
| 2708 void SystemDictionary::verify_obj_klass_present(Handle obj, | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2709 Symbol* class_name, |
| 0 | 2710 Handle class_loader) { |
| 2711 GCMutexLocker mu(SystemDictionary_lock); | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2712 Symbol* name; |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2713 |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2714 klassOop probe = find_class(class_name, class_loader); |
| 0 | 2715 if (probe == NULL) { |
| 2716 probe = SystemDictionary::find_shared_class(class_name); | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2717 if (probe == NULL) { |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2718 name = find_placeholder(class_name, class_loader); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2719 } |
| 0 | 2720 } |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2721 guarantee(probe != NULL || name != NULL, |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2722 "Loaded klasses should be in SystemDictionary"); |
| 0 | 2723 } |
| 2724 | |
| 2725 #ifndef PRODUCT | |
| 2726 | |
| 2727 // statistics code | |
| 2728 class ClassStatistics: AllStatic { | |
| 2729 private: | |
| 2730 static int nclasses; // number of classes | |
| 2731 static int nmethods; // number of methods | |
| 2732 static int nmethoddata; // number of methodData | |
| 2733 static int class_size; // size of class objects in words | |
| 2734 static int method_size; // size of method objects in words | |
| 2735 static int debug_size; // size of debug info in methods | |
| 2736 static int methoddata_size; // size of methodData objects in words | |
| 2737 | |
| 2738 static void do_class(klassOop k) { | |
| 2739 nclasses++; | |
| 2740 class_size += k->size(); | |
| 2741 if (k->klass_part()->oop_is_instance()) { | |
| 2742 instanceKlass* ik = (instanceKlass*)k->klass_part(); | |
| 2743 class_size += ik->methods()->size(); | |
| 2744 class_size += ik->constants()->size(); | |
| 2745 class_size += ik->local_interfaces()->size(); | |
| 2746 class_size += ik->transitive_interfaces()->size(); | |
| 2747 // We do not have to count implementors, since we only store one! | |
| 2748 class_size += ik->fields()->size(); | |
| 2749 } | |
| 2750 } | |
| 2751 | |
| 2752 static void do_method(methodOop m) { | |
| 2753 nmethods++; | |
| 2754 method_size += m->size(); | |
| 2755 // class loader uses same objArray for empty vectors, so don't count these | |
| 2756 if (m->exception_table()->length() != 0) method_size += m->exception_table()->size(); | |
| 2757 if (m->has_stackmap_table()) { | |
| 2758 method_size += m->stackmap_data()->size(); | |
| 2759 } | |
| 2760 | |
| 2761 methodDataOop mdo = m->method_data(); | |
| 2762 if (mdo != NULL) { | |
| 2763 nmethoddata++; | |
| 2764 methoddata_size += mdo->size(); | |
| 2765 } | |
| 2766 } | |
| 2767 | |
| 2768 public: | |
| 2769 static void print() { | |
| 2770 SystemDictionary::classes_do(do_class); | |
| 2771 SystemDictionary::methods_do(do_method); | |
| 2772 tty->print_cr("Class statistics:"); | |
| 2773 tty->print_cr("%d classes (%d bytes)", nclasses, class_size * oopSize); | |
| 2774 tty->print_cr("%d methods (%d bytes = %d base + %d debug info)", nmethods, | |
| 2775 (method_size + debug_size) * oopSize, method_size * oopSize, debug_size * oopSize); | |
| 2776 tty->print_cr("%d methoddata (%d bytes)", nmethoddata, methoddata_size * oopSize); | |
| 2777 } | |
| 2778 }; | |
| 2779 | |
| 2780 | |
| 2781 int ClassStatistics::nclasses = 0; | |
| 2782 int ClassStatistics::nmethods = 0; | |
| 2783 int ClassStatistics::nmethoddata = 0; | |
| 2784 int ClassStatistics::class_size = 0; | |
| 2785 int ClassStatistics::method_size = 0; | |
| 2786 int ClassStatistics::debug_size = 0; | |
| 2787 int ClassStatistics::methoddata_size = 0; | |
| 2788 | |
| 2789 void SystemDictionary::print_class_statistics() { | |
| 2790 ResourceMark rm; | |
| 2791 ClassStatistics::print(); | |
| 2792 } | |
| 2793 | |
| 2794 | |
| 2795 class MethodStatistics: AllStatic { | |
| 2796 public: | |
| 2797 enum { | |
| 2798 max_parameter_size = 10 | |
| 2799 }; | |
| 2800 private: | |
| 2801 | |
| 2802 static int _number_of_methods; | |
| 2803 static int _number_of_final_methods; | |
| 2804 static int _number_of_static_methods; | |
| 2805 static int _number_of_native_methods; | |
| 2806 static int _number_of_synchronized_methods; | |
| 2807 static int _number_of_profiled_methods; | |
| 2808 static int _number_of_bytecodes; | |
| 2809 static int _parameter_size_profile[max_parameter_size]; | |
| 2810 static int _bytecodes_profile[Bytecodes::number_of_java_codes]; | |
| 2811 | |
| 2812 static void initialize() { | |
| 2813 _number_of_methods = 0; | |
| 2814 _number_of_final_methods = 0; | |
| 2815 _number_of_static_methods = 0; | |
| 2816 _number_of_native_methods = 0; | |
| 2817 _number_of_synchronized_methods = 0; | |
| 2818 _number_of_profiled_methods = 0; | |
| 2819 _number_of_bytecodes = 0; | |
| 2820 for (int i = 0; i < max_parameter_size ; i++) _parameter_size_profile[i] = 0; | |
| 2821 for (int j = 0; j < Bytecodes::number_of_java_codes; j++) _bytecodes_profile [j] = 0; | |
| 2822 }; | |
| 2823 | |
| 2824 static void do_method(methodOop m) { | |
| 2825 _number_of_methods++; | |
| 2826 // collect flag info | |
| 2827 if (m->is_final() ) _number_of_final_methods++; | |
| 2828 if (m->is_static() ) _number_of_static_methods++; | |
| 2829 if (m->is_native() ) _number_of_native_methods++; | |
| 2830 if (m->is_synchronized()) _number_of_synchronized_methods++; | |
| 2831 if (m->method_data() != NULL) _number_of_profiled_methods++; | |
| 2832 // collect parameter size info (add one for receiver, if any) | |
| 2833 _parameter_size_profile[MIN2(m->size_of_parameters() + (m->is_static() ? 0 : 1), max_parameter_size - 1)]++; | |
| 2834 // collect bytecodes info | |
| 2835 { | |
| 2836 Thread *thread = Thread::current(); | |
| 2837 HandleMark hm(thread); | |
| 2838 BytecodeStream s(methodHandle(thread, m)); | |
| 2839 Bytecodes::Code c; | |
| 2840 while ((c = s.next()) >= 0) { | |
| 2841 _number_of_bytecodes++; | |
| 2842 _bytecodes_profile[c]++; | |
| 2843 } | |
| 2844 } | |
| 2845 } | |
| 2846 | |
| 2847 public: | |
| 2848 static void print() { | |
| 2849 initialize(); | |
| 2850 SystemDictionary::methods_do(do_method); | |
| 2851 // generate output | |
| 2852 tty->cr(); | |
| 2853 tty->print_cr("Method statistics (static):"); | |
| 2854 // flag distribution | |
| 2855 tty->cr(); | |
| 2856 tty->print_cr("%6d final methods %6.1f%%", _number_of_final_methods , _number_of_final_methods * 100.0F / _number_of_methods); | |
| 2857 tty->print_cr("%6d static methods %6.1f%%", _number_of_static_methods , _number_of_static_methods * 100.0F / _number_of_methods); | |
| 2858 tty->print_cr("%6d native methods %6.1f%%", _number_of_native_methods , _number_of_native_methods * 100.0F / _number_of_methods); | |
| 2859 tty->print_cr("%6d synchronized methods %6.1f%%", _number_of_synchronized_methods, _number_of_synchronized_methods * 100.0F / _number_of_methods); | |
| 2860 tty->print_cr("%6d profiled methods %6.1f%%", _number_of_profiled_methods, _number_of_profiled_methods * 100.0F / _number_of_methods); | |
| 2861 // parameter size profile | |
| 2862 tty->cr(); | |
| 2863 { int tot = 0; | |
| 2864 int avg = 0; | |
| 2865 for (int i = 0; i < max_parameter_size; i++) { | |
| 2866 int n = _parameter_size_profile[i]; | |
| 2867 tot += n; | |
| 2868 avg += n*i; | |
| 2869 tty->print_cr("parameter size = %1d: %6d methods %5.1f%%", i, n, n * 100.0F / _number_of_methods); | |
| 2870 } | |
| 2871 assert(tot == _number_of_methods, "should be the same"); | |
| 2872 tty->print_cr(" %6d methods 100.0%%", _number_of_methods); | |
| 2873 tty->print_cr("(average parameter size = %3.1f including receiver, if any)", (float)avg / _number_of_methods); | |
| 2874 } | |
| 2875 // bytecodes profile | |
| 2876 tty->cr(); | |
| 2877 { int tot = 0; | |
| 2878 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) { | |
| 2879 if (Bytecodes::is_defined(i)) { | |
| 2880 Bytecodes::Code c = Bytecodes::cast(i); | |
| 2881 int n = _bytecodes_profile[c]; | |
| 2882 tot += n; | |
| 2883 tty->print_cr("%9d %7.3f%% %s", n, n * 100.0F / _number_of_bytecodes, Bytecodes::name(c)); | |
| 2884 } | |
| 2885 } | |
| 2886 assert(tot == _number_of_bytecodes, "should be the same"); | |
| 2887 tty->print_cr("%9d 100.000%%", _number_of_bytecodes); | |
| 2888 } | |
| 2889 tty->cr(); | |
| 2890 } | |
| 2891 }; | |
| 2892 | |
| 2893 int MethodStatistics::_number_of_methods; | |
| 2894 int MethodStatistics::_number_of_final_methods; | |
| 2895 int MethodStatistics::_number_of_static_methods; | |
| 2896 int MethodStatistics::_number_of_native_methods; | |
| 2897 int MethodStatistics::_number_of_synchronized_methods; | |
| 2898 int MethodStatistics::_number_of_profiled_methods; | |
| 2899 int MethodStatistics::_number_of_bytecodes; | |
| 2900 int MethodStatistics::_parameter_size_profile[MethodStatistics::max_parameter_size]; | |
| 2901 int MethodStatistics::_bytecodes_profile[Bytecodes::number_of_java_codes]; | |
| 2902 | |
| 2903 | |
| 2904 void SystemDictionary::print_method_statistics() { | |
| 2905 MethodStatistics::print(); | |
| 2906 } | |
| 2907 | |
| 2908 #endif // PRODUCT |