Mercurial > hg > truffle
annotate src/share/vm/classfile/systemDictionary.cpp @ 4970:33df1aeaebbf
Merge with http://hg.openjdk.java.net/hsx/hsx24/hotspot/
| author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
|---|---|
| date | Mon, 27 Feb 2012 13:10:13 +0100 |
| parents | 04b9a2566eec b2cd0ee8f778 |
| children | 1b8d02e10ee8 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2012, 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; | |
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67 int SystemDictionary::_sdgeneration = 0; |
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68 const int SystemDictionary::_primelist[_prime_array_size] = {1009,2017,4049,5051,10103, |
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69 20201,40423,99991}; |
| 0 | 70 |
| 71 oop SystemDictionary::_system_loader_lock_obj = NULL; | |
| 72 | |
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73 klassOop SystemDictionary::_well_known_klasses[SystemDictionary::WKID_LIMIT] |
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74 = { NULL /*, NULL...*/ }; |
| 0 | 75 |
| 76 klassOop SystemDictionary::_box_klasses[T_VOID+1] = { NULL /*, NULL...*/ }; | |
| 77 | |
| 78 oop SystemDictionary::_java_system_loader = NULL; | |
| 79 | |
| 80 bool SystemDictionary::_has_loadClassInternal = false; | |
| 81 bool SystemDictionary::_has_checkPackageAccess = false; | |
| 82 | |
| 83 // lazily initialized klass variables | |
| 84 volatile klassOop SystemDictionary::_abstract_ownable_synchronizer_klass = NULL; | |
| 85 | |
| 86 | |
| 87 // ---------------------------------------------------------------------------- | |
| 88 // Java-level SystemLoader | |
| 89 | |
| 90 oop SystemDictionary::java_system_loader() { | |
| 91 return _java_system_loader; | |
| 92 } | |
| 93 | |
| 94 void SystemDictionary::compute_java_system_loader(TRAPS) { | |
| 1142 | 95 KlassHandle system_klass(THREAD, WK_KLASS(ClassLoader_klass)); |
| 0 | 96 JavaValue result(T_OBJECT); |
| 97 JavaCalls::call_static(&result, | |
| 1142 | 98 KlassHandle(THREAD, WK_KLASS(ClassLoader_klass)), |
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99 vmSymbols::getSystemClassLoader_name(), |
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100 vmSymbols::void_classloader_signature(), |
| 0 | 101 CHECK); |
| 102 | |
| 103 _java_system_loader = (oop)result.get_jobject(); | |
| 104 } | |
| 105 | |
| 106 | |
| 107 // ---------------------------------------------------------------------------- | |
| 108 // debugging | |
| 109 | |
| 110 #ifdef ASSERT | |
| 111 | |
| 112 // return true if class_name contains no '.' (internal format is '/') | |
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113 bool SystemDictionary::is_internal_format(Symbol* class_name) { |
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114 if (class_name != NULL) { |
| 0 | 115 ResourceMark rm; |
| 116 char* name = class_name->as_C_string(); | |
| 117 return strchr(name, '.') == NULL; | |
| 118 } else { | |
| 119 return true; | |
| 120 } | |
| 121 } | |
| 122 | |
| 123 #endif | |
| 124 | |
| 125 // ---------------------------------------------------------------------------- | |
| 514 | 126 // Parallel class loading check |
| 127 | |
| 128 bool SystemDictionary::is_parallelCapable(Handle class_loader) { | |
| 129 if (UnsyncloadClass || class_loader.is_null()) return true; | |
| 130 if (AlwaysLockClassLoader) return false; | |
| 3938 | 131 return java_lang_ClassLoader::parallelCapable(class_loader()); |
| 514 | 132 } |
| 133 // ---------------------------------------------------------------------------- | |
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134 // ParallelDefineClass flag does not apply to bootclass loader |
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135 bool SystemDictionary::is_parallelDefine(Handle class_loader) { |
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136 if (class_loader.is_null()) return false; |
| 3938 | 137 if (AllowParallelDefineClass && java_lang_ClassLoader::parallelCapable(class_loader())) { |
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138 return true; |
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139 } |
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140 return false; |
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141 } |
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142 // ---------------------------------------------------------------------------- |
| 0 | 143 // Resolving of classes |
| 144 | |
| 145 // Forwards to resolve_or_null | |
| 146 | |
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147 klassOop SystemDictionary::resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS) { |
| 0 | 148 klassOop klass = resolve_or_null(class_name, class_loader, protection_domain, THREAD); |
| 149 if (HAS_PENDING_EXCEPTION || klass == NULL) { | |
| 150 KlassHandle k_h(THREAD, klass); | |
| 151 // can return a null klass | |
| 152 klass = handle_resolution_exception(class_name, class_loader, protection_domain, throw_error, k_h, THREAD); | |
| 153 } | |
| 154 return klass; | |
| 155 } | |
| 156 | |
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157 klassOop SystemDictionary::handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS) { |
| 0 | 158 if (HAS_PENDING_EXCEPTION) { |
| 159 // If we have a pending exception we forward it to the caller, unless throw_error is true, | |
| 160 // in which case we have to check whether the pending exception is a ClassNotFoundException, | |
| 161 // and if so convert it to a NoClassDefFoundError | |
| 162 // And chain the original ClassNotFoundException | |
| 1142 | 163 if (throw_error && PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass())) { |
| 0 | 164 ResourceMark rm(THREAD); |
| 165 assert(klass_h() == NULL, "Should not have result with exception pending"); | |
| 166 Handle e(THREAD, PENDING_EXCEPTION); | |
| 167 CLEAR_PENDING_EXCEPTION; | |
| 168 THROW_MSG_CAUSE_0(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string(), e); | |
| 169 } else { | |
| 170 return NULL; | |
| 171 } | |
| 172 } | |
| 173 // Class not found, throw appropriate error or exception depending on value of throw_error | |
| 174 if (klass_h() == NULL) { | |
| 175 ResourceMark rm(THREAD); | |
| 176 if (throw_error) { | |
| 177 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string()); | |
| 178 } else { | |
| 179 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), class_name->as_C_string()); | |
| 180 } | |
| 181 } | |
| 182 return (klassOop)klass_h(); | |
| 183 } | |
| 184 | |
| 185 | |
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186 klassOop SystemDictionary::resolve_or_fail(Symbol* class_name, |
| 0 | 187 bool throw_error, TRAPS) |
| 188 { | |
| 189 return resolve_or_fail(class_name, Handle(), Handle(), throw_error, THREAD); | |
| 190 } | |
| 191 | |
| 192 | |
| 193 // Forwards to resolve_instance_class_or_null | |
| 194 | |
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195 klassOop SystemDictionary::resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS) { |
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196 // (tw) May we do this? |
| 2181 | 197 //assert(!THREAD->is_Compiler_thread(), "Can not load classes with the Compiler thread"); |
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198 if (FieldType::is_array(class_name)) { |
| 0 | 199 return resolve_array_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); |
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200 } else if (FieldType::is_obj(class_name)) { |
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201 ResourceMark rm(THREAD); |
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202 // Ignore wrapping L and ;. |
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203 TempNewSymbol name = SymbolTable::new_symbol(class_name->as_C_string() + 1, |
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204 class_name->utf8_length() - 2, CHECK_NULL); |
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205 return resolve_instance_class_or_null(name, class_loader, protection_domain, CHECK_NULL); |
| 0 | 206 } else { |
| 207 return resolve_instance_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); | |
| 208 } | |
| 209 } | |
| 210 | |
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211 klassOop SystemDictionary::resolve_or_null(Symbol* class_name, TRAPS) { |
| 0 | 212 return resolve_or_null(class_name, Handle(), Handle(), THREAD); |
| 213 } | |
| 214 | |
| 215 // Forwards to resolve_instance_class_or_null | |
| 216 | |
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217 klassOop SystemDictionary::resolve_array_class_or_null(Symbol* class_name, |
| 0 | 218 Handle class_loader, |
| 219 Handle protection_domain, | |
| 220 TRAPS) { | |
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221 assert(FieldType::is_array(class_name), "must be array"); |
| 0 | 222 klassOop k = NULL; |
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223 FieldArrayInfo fd; |
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224 // dimension and object_key in FieldArrayInfo are assigned as a side-effect |
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225 // of this call |
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226 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_NULL); |
| 0 | 227 if (t == T_OBJECT) { |
| 228 // naked oop "k" is OK here -- we assign back into it | |
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229 k = SystemDictionary::resolve_instance_class_or_null(fd.object_key(), |
| 0 | 230 class_loader, |
| 231 protection_domain, | |
| 232 CHECK_NULL); | |
| 233 if (k != NULL) { | |
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234 k = Klass::cast(k)->array_klass(fd.dimension(), CHECK_NULL); |
| 0 | 235 } |
| 236 } else { | |
| 237 k = Universe::typeArrayKlassObj(t); | |
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238 k = typeArrayKlass::cast(k)->array_klass(fd.dimension(), CHECK_NULL); |
| 0 | 239 } |
| 240 return k; | |
| 241 } | |
| 242 | |
| 243 | |
| 244 // Must be called for any super-class or super-interface resolution | |
| 245 // during class definition to allow class circularity checking | |
| 246 // super-interface callers: | |
| 247 // parse_interfaces - for defineClass & jvmtiRedefineClasses | |
| 248 // super-class callers: | |
| 249 // ClassFileParser - for defineClass & jvmtiRedefineClasses | |
| 250 // load_shared_class - while loading a class from shared archive | |
| 514 | 251 // resolve_instance_class_or_null: |
| 252 // via: handle_parallel_super_load | |
| 0 | 253 // when resolving a class that has an existing placeholder with |
| 254 // a saved superclass [i.e. a defineClass is currently in progress] | |
| 255 // if another thread is trying to resolve the class, it must do | |
| 256 // super-class checks on its own thread to catch class circularity | |
| 257 // This last call is critical in class circularity checking for cases | |
| 258 // where classloading is delegated to different threads and the | |
| 259 // classloader lock is released. | |
| 260 // Take the case: Base->Super->Base | |
| 261 // 1. If thread T1 tries to do a defineClass of class Base | |
| 262 // resolve_super_or_fail creates placeholder: T1, Base (super Super) | |
| 263 // 2. resolve_instance_class_or_null does not find SD or placeholder for Super | |
| 264 // so it tries to load Super | |
| 265 // 3. If we load the class internally, or user classloader uses same thread | |
| 266 // loadClassFromxxx or defineClass via parseClassFile Super ... | |
| 267 // 3.1 resolve_super_or_fail creates placeholder: T1, Super (super Base) | |
| 268 // 3.3 resolve_instance_class_or_null Base, finds placeholder for Base | |
| 269 // 3.4 calls resolve_super_or_fail Base | |
| 270 // 3.5 finds T1,Base -> throws class circularity | |
| 271 //OR 4. If T2 tries to resolve Super via defineClass Super ... | |
| 272 // 4.1 resolve_super_or_fail creates placeholder: T2, Super (super Base) | |
| 273 // 4.2 resolve_instance_class_or_null Base, finds placeholder for Base (super Super) | |
| 274 // 4.3 calls resolve_super_or_fail Super in parallel on own thread T2 | |
| 275 // 4.4 finds T2, Super -> throws class circularity | |
| 276 // Must be called, even if superclass is null, since this is | |
| 277 // where the placeholder entry is created which claims this | |
| 278 // thread is loading this class/classloader. | |
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279 klassOop SystemDictionary::resolve_super_or_fail(Symbol* child_name, |
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280 Symbol* class_name, |
| 0 | 281 Handle class_loader, |
| 282 Handle protection_domain, | |
| 283 bool is_superclass, | |
| 284 TRAPS) { | |
| 285 | |
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286 // Try to get one of the well-known klasses. |
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287 // They are trusted, and do not participate in circularities. |
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288 if (LinkWellKnownClasses) { |
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289 klassOop k = find_well_known_klass(class_name); |
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290 if (k != NULL) { |
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291 return k; |
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292 } |
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293 } |
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294 |
| 0 | 295 // Double-check, if child class is already loaded, just return super-class,interface |
| 296 // Don't add a placedholder if already loaded, i.e. already in system dictionary | |
| 297 // Make sure there's a placeholder for the *child* before resolving. | |
| 298 // Used as a claim that this thread is currently loading superclass/classloader | |
| 299 // Used here for ClassCircularity checks and also for heap verification | |
| 300 // (every instanceKlass in the heap needs to be in the system dictionary | |
| 301 // or have a placeholder). | |
| 302 // Must check ClassCircularity before checking if super class is already loaded | |
| 303 // | |
| 304 // We might not already have a placeholder if this child_name was | |
| 305 // first seen via resolve_from_stream (jni_DefineClass or JVM_DefineClass); | |
| 306 // the name of the class might not be known until the stream is actually | |
| 307 // parsed. | |
| 308 // Bugs 4643874, 4715493 | |
| 309 // compute_hash can have a safepoint | |
| 310 | |
| 311 unsigned int d_hash = dictionary()->compute_hash(child_name, class_loader); | |
| 312 int d_index = dictionary()->hash_to_index(d_hash); | |
| 313 unsigned int p_hash = placeholders()->compute_hash(child_name, class_loader); | |
| 314 int p_index = placeholders()->hash_to_index(p_hash); | |
| 315 // can't throw error holding a lock | |
| 316 bool child_already_loaded = false; | |
| 317 bool throw_circularity_error = false; | |
| 318 { | |
| 319 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 320 klassOop childk = find_class(d_index, d_hash, child_name, class_loader); | |
| 321 klassOop quicksuperk; | |
| 322 // to support // loading: if child done loading, just return superclass | |
| 323 // if class_name, & class_loader don't match: | |
| 324 // if initial define, SD update will give LinkageError | |
| 325 // if redefine: compare_class_versions will give HIERARCHY_CHANGED | |
| 326 // so we don't throw an exception here. | |
| 327 // see: nsk redefclass014 & java.lang.instrument Instrument032 | |
| 328 if ((childk != NULL ) && (is_superclass) && | |
| 329 ((quicksuperk = instanceKlass::cast(childk)->super()) != NULL) && | |
| 330 | |
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331 ((Klass::cast(quicksuperk)->name() == class_name) && |
| 0 | 332 (Klass::cast(quicksuperk)->class_loader() == class_loader()))) { |
| 333 return quicksuperk; | |
| 334 } else { | |
| 335 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, class_loader); | |
| 336 if (probe && probe->check_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER)) { | |
| 337 throw_circularity_error = true; | |
| 338 } | |
| 514 | 339 } |
| 340 if (!throw_circularity_error) { | |
| 0 | 341 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, child_name, class_loader, PlaceholderTable::LOAD_SUPER, class_name, THREAD); |
| 342 } | |
| 343 } | |
| 344 if (throw_circularity_error) { | |
| 345 ResourceMark rm(THREAD); | |
| 346 THROW_MSG_0(vmSymbols::java_lang_ClassCircularityError(), child_name->as_C_string()); | |
| 347 } | |
| 348 | |
| 349 // java.lang.Object should have been found above | |
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350 assert(class_name != NULL, "null super class for resolving"); |
| 0 | 351 // Resolve the super class or interface, check results on return |
| 352 klassOop superk = NULL; | |
| 353 superk = SystemDictionary::resolve_or_null(class_name, | |
| 354 class_loader, | |
| 355 protection_domain, | |
| 356 THREAD); | |
| 357 | |
| 358 KlassHandle superk_h(THREAD, superk); | |
| 359 | |
| 360 // Note: clean up of placeholders currently in callers of | |
| 361 // resolve_super_or_fail - either at update_dictionary time | |
| 362 // or on error | |
| 363 { | |
| 364 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 365 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, class_loader); | |
| 366 if (probe != NULL) { | |
| 367 probe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER); | |
| 368 } | |
| 369 } | |
| 370 if (HAS_PENDING_EXCEPTION || superk_h() == NULL) { | |
| 371 // can null superk | |
| 372 superk_h = KlassHandle(THREAD, handle_resolution_exception(class_name, class_loader, protection_domain, true, superk_h, THREAD)); | |
| 373 } | |
| 374 | |
| 375 return superk_h(); | |
| 376 } | |
| 377 | |
| 378 void SystemDictionary::validate_protection_domain(instanceKlassHandle klass, | |
| 379 Handle class_loader, | |
| 380 Handle protection_domain, | |
| 381 TRAPS) { | |
| 382 if(!has_checkPackageAccess()) return; | |
| 383 | |
| 384 // Now we have to call back to java to check if the initating class has access | |
| 385 JavaValue result(T_VOID); | |
| 386 if (TraceProtectionDomainVerification) { | |
| 387 // Print out trace information | |
| 388 tty->print_cr("Checking package access"); | |
| 389 tty->print(" - class loader: "); class_loader()->print_value_on(tty); tty->cr(); | |
| 390 tty->print(" - protection domain: "); protection_domain()->print_value_on(tty); tty->cr(); | |
| 391 tty->print(" - loading: "); klass()->print_value_on(tty); tty->cr(); | |
| 392 } | |
| 393 | |
| 394 assert(class_loader() != NULL, "should not have non-null protection domain for null classloader"); | |
| 395 | |
| 1142 | 396 KlassHandle system_loader(THREAD, SystemDictionary::ClassLoader_klass()); |
| 0 | 397 JavaCalls::call_special(&result, |
| 398 class_loader, | |
| 399 system_loader, | |
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400 vmSymbols::checkPackageAccess_name(), |
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401 vmSymbols::class_protectiondomain_signature(), |
| 0 | 402 Handle(THREAD, klass->java_mirror()), |
| 403 protection_domain, | |
| 404 THREAD); | |
| 405 | |
| 406 if (TraceProtectionDomainVerification) { | |
| 407 if (HAS_PENDING_EXCEPTION) { | |
| 408 tty->print_cr(" -> DENIED !!!!!!!!!!!!!!!!!!!!!"); | |
| 409 } else { | |
| 410 tty->print_cr(" -> granted"); | |
| 411 } | |
| 412 tty->cr(); | |
| 413 } | |
| 414 | |
| 415 if (HAS_PENDING_EXCEPTION) return; | |
| 416 | |
| 417 // If no exception has been thrown, we have validated the protection domain | |
| 418 // Insert the protection domain of the initiating class into the set. | |
| 419 { | |
| 420 // We recalculate the entry here -- we've called out to java since | |
| 421 // the last time it was calculated. | |
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422 Symbol* kn = klass->name(); |
| 0 | 423 unsigned int d_hash = dictionary()->compute_hash(kn, class_loader); |
| 424 int d_index = dictionary()->hash_to_index(d_hash); | |
| 425 | |
| 426 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 427 { | |
| 428 // Note that we have an entry, and entries can be deleted only during GC, | |
| 429 // so we cannot allow GC to occur while we're holding this entry. | |
| 430 | |
| 431 // We're using a No_Safepoint_Verifier to catch any place where we | |
| 432 // might potentially do a GC at all. | |
| 433 // SystemDictionary::do_unloading() asserts that classes are only | |
| 434 // unloaded at a safepoint. | |
| 435 No_Safepoint_Verifier nosafepoint; | |
| 436 dictionary()->add_protection_domain(d_index, d_hash, klass, class_loader, | |
| 437 protection_domain, THREAD); | |
| 438 } | |
| 439 } | |
| 440 } | |
| 441 | |
| 442 // We only get here if this thread finds that another thread | |
| 443 // has already claimed the placeholder token for the current operation, | |
| 444 // but that other thread either never owned or gave up the | |
| 445 // object lock | |
| 446 // Waits on SystemDictionary_lock to indicate placeholder table updated | |
| 447 // On return, caller must recheck placeholder table state | |
| 448 // | |
| 449 // We only get here if | |
| 450 // 1) custom classLoader, i.e. not bootstrap classloader | |
| 451 // 2) UnsyncloadClass not set | |
| 452 // 3) custom classLoader has broken the class loader objectLock | |
| 453 // so another thread got here in parallel | |
| 454 // | |
| 455 // lockObject must be held. | |
| 456 // Complicated dance due to lock ordering: | |
| 457 // Must first release the classloader object lock to | |
| 458 // allow initial definer to complete the class definition | |
| 459 // and to avoid deadlock | |
| 460 // Reclaim classloader lock object with same original recursion count | |
| 461 // Must release SystemDictionary_lock after notify, since | |
| 462 // class loader lock must be claimed before SystemDictionary_lock | |
| 463 // to prevent deadlocks | |
| 464 // | |
| 465 // The notify allows applications that did an untimed wait() on | |
| 466 // the classloader object lock to not hang. | |
| 467 void SystemDictionary::double_lock_wait(Handle lockObject, TRAPS) { | |
| 468 assert_lock_strong(SystemDictionary_lock); | |
| 469 | |
| 470 bool calledholdinglock | |
| 471 = ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, lockObject); | |
| 472 assert(calledholdinglock,"must hold lock for notify"); | |
| 514 | 473 assert((!(lockObject() == _system_loader_lock_obj) && !is_parallelCapable(lockObject)), "unexpected double_lock_wait"); |
| 0 | 474 ObjectSynchronizer::notifyall(lockObject, THREAD); |
| 475 intptr_t recursions = ObjectSynchronizer::complete_exit(lockObject, THREAD); | |
| 476 SystemDictionary_lock->wait(); | |
| 477 SystemDictionary_lock->unlock(); | |
| 478 ObjectSynchronizer::reenter(lockObject, recursions, THREAD); | |
| 479 SystemDictionary_lock->lock(); | |
| 480 } | |
| 481 | |
| 482 // If the class in is in the placeholder table, class loading is in progress | |
| 483 // For cases where the application changes threads to load classes, it | |
| 484 // is critical to ClassCircularity detection that we try loading | |
| 485 // the superclass on the same thread internally, so we do parallel | |
| 486 // super class loading here. | |
| 487 // This also is critical in cases where the original thread gets stalled | |
| 488 // even in non-circularity situations. | |
| 489 // Note: only one thread can define the class, but multiple can resolve | |
| 490 // Note: must call resolve_super_or_fail even if null super - | |
| 514 | 491 // to force placeholder entry creation for this class for circularity detection |
| 0 | 492 // Caller must check for pending exception |
| 493 // Returns non-null klassOop if other thread has completed load | |
| 494 // and we are done, | |
| 495 // If return null klassOop and no pending exception, the caller must load the class | |
| 496 instanceKlassHandle SystemDictionary::handle_parallel_super_load( | |
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497 Symbol* name, Symbol* superclassname, Handle class_loader, |
| 0 | 498 Handle protection_domain, Handle lockObject, TRAPS) { |
| 499 | |
| 500 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
| 501 unsigned int d_hash = dictionary()->compute_hash(name, class_loader); | |
| 502 int d_index = dictionary()->hash_to_index(d_hash); | |
| 503 unsigned int p_hash = placeholders()->compute_hash(name, class_loader); | |
| 504 int p_index = placeholders()->hash_to_index(p_hash); | |
| 505 | |
| 506 // superk is not used, resolve_super called for circularity check only | |
| 507 // This code is reached in two situations. One if this thread | |
| 508 // is loading the same class twice (e.g. ClassCircularity, or | |
| 509 // java.lang.instrument). | |
| 510 // The second is if another thread started the resolve_super first | |
| 511 // and has not yet finished. | |
| 512 // In both cases the original caller will clean up the placeholder | |
| 513 // entry on error. | |
| 514 klassOop superk = SystemDictionary::resolve_super_or_fail(name, | |
| 515 superclassname, | |
| 516 class_loader, | |
| 517 protection_domain, | |
| 518 true, | |
| 519 CHECK_(nh)); | |
| 520 // We don't redefine the class, so we just need to clean up if there | |
| 521 // was not an error (don't want to modify any system dictionary | |
| 522 // data structures). | |
| 523 { | |
| 524 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 525 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
| 526 SystemDictionary_lock->notify_all(); | |
| 527 } | |
| 528 | |
| 514 | 529 // parallelCapable class loaders do NOT wait for parallel superclass loads to complete |
| 530 // Serial class loaders and bootstrap classloader do wait for superclass loads | |
| 531 if (!class_loader.is_null() && is_parallelCapable(class_loader)) { | |
| 0 | 532 MutexLocker mu(SystemDictionary_lock, THREAD); |
| 533 // Check if classloading completed while we were loading superclass or waiting | |
| 534 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 535 if (check != NULL) { | |
| 536 // Klass is already loaded, so just return it | |
| 537 return(instanceKlassHandle(THREAD, check)); | |
| 538 } else { | |
| 539 return nh; | |
| 540 } | |
| 541 } | |
| 542 | |
| 543 // must loop to both handle other placeholder updates | |
| 544 // and spurious notifications | |
| 545 bool super_load_in_progress = true; | |
| 546 PlaceholderEntry* placeholder; | |
| 547 while (super_load_in_progress) { | |
| 548 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 549 // Check if classloading completed while we were loading superclass or waiting | |
| 550 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 551 if (check != NULL) { | |
| 552 // Klass is already loaded, so just return it | |
| 553 return(instanceKlassHandle(THREAD, check)); | |
| 554 } else { | |
| 555 placeholder = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
| 556 if (placeholder && placeholder->super_load_in_progress() ){ | |
| 557 // Before UnsyncloadClass: | |
| 558 // We only get here if the application has released the | |
| 559 // classloader lock when another thread was in the middle of loading a | |
| 560 // superclass/superinterface for this class, and now | |
| 561 // this thread is also trying to load this class. | |
| 562 // To minimize surprises, the first thread that started to | |
| 563 // load a class should be the one to complete the loading | |
| 564 // with the classfile it initially expected. | |
| 565 // This logic has the current thread wait once it has done | |
| 566 // all the superclass/superinterface loading it can, until | |
| 567 // the original thread completes the class loading or fails | |
| 568 // If it completes we will use the resulting instanceKlass | |
| 569 // which we will find below in the systemDictionary. | |
| 570 // We also get here for parallel bootstrap classloader | |
| 571 if (class_loader.is_null()) { | |
| 572 SystemDictionary_lock->wait(); | |
| 573 } else { | |
| 574 double_lock_wait(lockObject, THREAD); | |
| 575 } | |
| 576 } else { | |
| 577 // If not in SD and not in PH, other thread's load must have failed | |
| 578 super_load_in_progress = false; | |
| 579 } | |
| 580 } | |
| 581 } | |
| 582 return (nh); | |
| 583 } | |
| 584 | |
| 585 | |
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586 klassOop SystemDictionary::resolve_instance_class_or_null(Symbol* name, Handle class_loader, Handle protection_domain, TRAPS) { |
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587 assert(name != NULL && !FieldType::is_array(name) && |
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588 !FieldType::is_obj(name), "invalid class name"); |
| 0 | 589 |
| 590 // UseNewReflection | |
| 591 // Fix for 4474172; see evaluation for more details | |
| 592 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); | |
| 593 | |
| 594 // Do lookup to see if class already exist and the protection domain | |
| 595 // has the right access | |
| 596 unsigned int d_hash = dictionary()->compute_hash(name, class_loader); | |
| 597 int d_index = dictionary()->hash_to_index(d_hash); | |
| 598 klassOop probe = dictionary()->find(d_index, d_hash, name, class_loader, | |
| 599 protection_domain, THREAD); | |
| 600 if (probe != NULL) return probe; | |
| 601 | |
| 602 | |
| 603 // Non-bootstrap class loaders will call out to class loader and | |
| 604 // define via jvm/jni_DefineClass which will acquire the | |
| 605 // class loader object lock to protect against multiple threads | |
| 606 // defining the class in parallel by accident. | |
| 607 // This lock must be acquired here so the waiter will find | |
| 608 // any successful result in the SystemDictionary and not attempt | |
| 609 // the define | |
| 514 | 610 // ParallelCapable Classloaders and the bootstrap classloader, |
| 0 | 611 // or all classloaders with UnsyncloadClass do not acquire lock here |
| 612 bool DoObjectLock = true; | |
| 514 | 613 if (is_parallelCapable(class_loader)) { |
| 0 | 614 DoObjectLock = false; |
| 615 } | |
| 616 | |
| 617 unsigned int p_hash = placeholders()->compute_hash(name, class_loader); | |
| 618 int p_index = placeholders()->hash_to_index(p_hash); | |
| 619 | |
| 620 // Class is not in SystemDictionary so we have to do loading. | |
| 621 // Make sure we are synchronized on the class loader before we proceed | |
| 622 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
| 623 check_loader_lock_contention(lockObject, THREAD); | |
| 624 ObjectLocker ol(lockObject, THREAD, DoObjectLock); | |
| 625 | |
| 626 // Check again (after locking) if class already exist in SystemDictionary | |
| 627 bool class_has_been_loaded = false; | |
| 628 bool super_load_in_progress = false; | |
| 629 bool havesupername = false; | |
| 630 instanceKlassHandle k; | |
| 631 PlaceholderEntry* placeholder; | |
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632 Symbol* superclassname = NULL; |
| 0 | 633 |
| 634 { | |
| 635 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 636 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 637 if (check != NULL) { | |
| 638 // Klass is already loaded, so just return it | |
| 639 class_has_been_loaded = true; | |
| 640 k = instanceKlassHandle(THREAD, check); | |
| 641 } else { | |
| 642 placeholder = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
| 643 if (placeholder && placeholder->super_load_in_progress()) { | |
| 644 super_load_in_progress = true; | |
| 645 if (placeholder->havesupername() == true) { | |
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646 superclassname = placeholder->supername(); |
| 0 | 647 havesupername = true; |
| 648 } | |
| 649 } | |
| 650 } | |
| 651 } | |
| 652 | |
| 653 // If the class in is in the placeholder table, class loading is in progress | |
| 654 if (super_load_in_progress && havesupername==true) { | |
| 655 k = SystemDictionary::handle_parallel_super_load(name, superclassname, | |
| 656 class_loader, protection_domain, lockObject, THREAD); | |
| 657 if (HAS_PENDING_EXCEPTION) { | |
| 658 return NULL; | |
| 659 } | |
| 660 if (!k.is_null()) { | |
| 661 class_has_been_loaded = true; | |
| 662 } | |
| 663 } | |
| 664 | |
| 665 if (!class_has_been_loaded) { | |
| 666 | |
| 667 // add placeholder entry to record loading instance class | |
| 668 // Five cases: | |
| 669 // All cases need to prevent modifying bootclasssearchpath | |
| 670 // in parallel with a classload of same classname | |
| 514 | 671 // Redefineclasses uses existence of the placeholder for the duration |
| 672 // of the class load to prevent concurrent redefinition of not completely | |
| 673 // defined classes. | |
| 0 | 674 // case 1. traditional classloaders that rely on the classloader object lock |
| 675 // - no other need for LOAD_INSTANCE | |
| 676 // case 2. traditional classloaders that break the classloader object lock | |
| 677 // as a deadlock workaround. Detection of this case requires that | |
| 678 // this check is done while holding the classloader object lock, | |
| 679 // and that lock is still held when calling classloader's loadClass. | |
| 680 // For these classloaders, we ensure that the first requestor | |
| 681 // completes the load and other requestors wait for completion. | |
| 682 // case 3. UnsyncloadClass - don't use objectLocker | |
| 683 // With this flag, we allow parallel classloading of a | |
| 684 // class/classloader pair | |
| 685 // case4. Bootstrap classloader - don't own objectLocker | |
| 686 // This classloader supports parallelism at the classloader level, | |
| 687 // but only allows a single load of a class/classloader pair. | |
| 688 // No performance benefit and no deadlock issues. | |
| 514 | 689 // case 5. parallelCapable user level classloaders - without objectLocker |
| 690 // Allow parallel classloading of a class/classloader pair | |
| 0 | 691 bool throw_circularity_error = false; |
| 692 { | |
| 693 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 514 | 694 if (class_loader.is_null() || !is_parallelCapable(class_loader)) { |
| 0 | 695 PlaceholderEntry* oldprobe = placeholders()->get_entry(p_index, p_hash, name, class_loader); |
| 696 if (oldprobe) { | |
| 697 // only need check_seen_thread once, not on each loop | |
| 698 // 6341374 java/lang/Instrument with -Xcomp | |
| 699 if (oldprobe->check_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE)) { | |
| 700 throw_circularity_error = true; | |
| 701 } else { | |
| 702 // case 1: traditional: should never see load_in_progress. | |
| 703 while (!class_has_been_loaded && oldprobe && oldprobe->instance_load_in_progress()) { | |
| 704 | |
| 705 // case 4: bootstrap classloader: prevent futile classloading, | |
| 706 // wait on first requestor | |
| 707 if (class_loader.is_null()) { | |
| 708 SystemDictionary_lock->wait(); | |
| 709 } else { | |
| 710 // case 2: traditional with broken classloader lock. wait on first | |
| 711 // requestor. | |
| 712 double_lock_wait(lockObject, THREAD); | |
| 713 } | |
| 714 // Check if classloading completed while we were waiting | |
| 715 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 716 if (check != NULL) { | |
| 717 // Klass is already loaded, so just return it | |
| 718 k = instanceKlassHandle(THREAD, check); | |
| 719 class_has_been_loaded = true; | |
| 720 } | |
| 721 // check if other thread failed to load and cleaned up | |
| 722 oldprobe = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
| 723 } | |
| 724 } | |
| 725 } | |
| 726 } | |
| 727 // All cases: add LOAD_INSTANCE | |
| 514 | 728 // case 3: UnsyncloadClass || case 5: parallelCapable: allow competing threads to try |
| 0 | 729 // LOAD_INSTANCE in parallel |
| 730 // add placeholder entry even if error - callers will remove on error | |
| 514 | 731 if (!throw_circularity_error && !class_has_been_loaded) { |
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732 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, name, class_loader, PlaceholderTable::LOAD_INSTANCE, NULL, THREAD); |
| 0 | 733 // For class loaders that do not acquire the classloader object lock, |
| 734 // if they did not catch another thread holding LOAD_INSTANCE, | |
| 735 // need a check analogous to the acquire ObjectLocker/find_class | |
| 736 // i.e. now that we hold the LOAD_INSTANCE token on loading this class/CL | |
| 737 // one final check if the load has already completed | |
| 514 | 738 // class loaders holding the ObjectLock shouldn't find the class here |
| 0 | 739 klassOop check = find_class(d_index, d_hash, name, class_loader); |
| 740 if (check != NULL) { | |
| 741 // Klass is already loaded, so just return it | |
| 742 k = instanceKlassHandle(THREAD, check); | |
| 743 class_has_been_loaded = true; | |
| 744 newprobe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE); | |
| 514 | 745 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); |
| 746 SystemDictionary_lock->notify_all(); | |
| 0 | 747 } |
| 748 } | |
| 749 } | |
| 750 // must throw error outside of owning lock | |
| 751 if (throw_circularity_error) { | |
| 752 ResourceMark rm(THREAD); | |
| 753 THROW_MSG_0(vmSymbols::java_lang_ClassCircularityError(), name->as_C_string()); | |
| 754 } | |
| 755 | |
| 756 if (!class_has_been_loaded) { | |
| 757 | |
| 758 // Do actual loading | |
| 759 k = load_instance_class(name, class_loader, THREAD); | |
| 760 | |
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761 // For UnsyncloadClass only |
| 0 | 762 // If they got a linkageError, check if a parallel class load succeeded. |
| 763 // If it did, then for bytecode resolution the specification requires | |
| 764 // that we return the same result we did for the other thread, i.e. the | |
| 765 // successfully loaded instanceKlass | |
| 766 // Should not get here for classloaders that support parallelism | |
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767 // with the new cleaner mechanism, even with AllowParallelDefineClass |
| 514 | 768 // Bootstrap goes through here to allow for an extra guarantee check |
| 0 | 769 if (UnsyncloadClass || (class_loader.is_null())) { |
| 770 if (k.is_null() && HAS_PENDING_EXCEPTION | |
| 1142 | 771 && PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { |
| 0 | 772 MutexLocker mu(SystemDictionary_lock, THREAD); |
| 773 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 774 if (check != NULL) { | |
| 775 // Klass is already loaded, so just use it | |
| 776 k = instanceKlassHandle(THREAD, check); | |
| 777 CLEAR_PENDING_EXCEPTION; | |
| 778 guarantee((!class_loader.is_null()), "dup definition for bootstrap loader?"); | |
| 779 } | |
| 780 } | |
| 781 } | |
| 782 | |
| 783 // clean up placeholder entries for success or error | |
| 784 // This cleans up LOAD_INSTANCE entries | |
| 785 // It also cleans up LOAD_SUPER entries on errors from | |
| 786 // calling load_instance_class | |
| 787 { | |
| 788 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 789 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
| 790 if (probe != NULL) { | |
| 791 probe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE); | |
| 792 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
| 793 SystemDictionary_lock->notify_all(); | |
| 794 } | |
| 795 } | |
| 796 | |
| 797 // If everything was OK (no exceptions, no null return value), and | |
| 798 // class_loader is NOT the defining loader, do a little more bookkeeping. | |
| 799 if (!HAS_PENDING_EXCEPTION && !k.is_null() && | |
| 800 k->class_loader() != class_loader()) { | |
| 801 | |
| 802 check_constraints(d_index, d_hash, k, class_loader, false, THREAD); | |
| 803 | |
| 804 // Need to check for a PENDING_EXCEPTION again; check_constraints | |
| 805 // can throw and doesn't use the CHECK macro. | |
| 806 if (!HAS_PENDING_EXCEPTION) { | |
| 807 { // Grabbing the Compile_lock prevents systemDictionary updates | |
| 808 // during compilations. | |
| 809 MutexLocker mu(Compile_lock, THREAD); | |
| 810 update_dictionary(d_index, d_hash, p_index, p_hash, | |
| 811 k, class_loader, THREAD); | |
| 812 } | |
| 813 if (JvmtiExport::should_post_class_load()) { | |
| 814 Thread *thread = THREAD; | |
| 815 assert(thread->is_Java_thread(), "thread->is_Java_thread()"); | |
| 816 JvmtiExport::post_class_load((JavaThread *) thread, k()); | |
| 817 } | |
| 818 } | |
| 819 } | |
| 820 if (HAS_PENDING_EXCEPTION || k.is_null()) { | |
| 821 // On error, clean up placeholders | |
| 822 { | |
| 823 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 824 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
| 825 SystemDictionary_lock->notify_all(); | |
| 826 } | |
| 827 return NULL; | |
| 828 } | |
| 829 } | |
| 830 } | |
| 831 | |
| 832 #ifdef ASSERT | |
| 833 { | |
| 834 Handle loader (THREAD, k->class_loader()); | |
| 835 MutexLocker mu(SystemDictionary_lock, THREAD); | |
|
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836 oop kk = find_class(name, loader); |
| 0 | 837 assert(kk == k(), "should be present in dictionary"); |
| 838 } | |
| 839 #endif | |
| 840 | |
| 841 // return if the protection domain in NULL | |
| 842 if (protection_domain() == NULL) return k(); | |
| 843 | |
| 844 // Check the protection domain has the right access | |
| 845 { | |
| 846 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 847 // Note that we have an entry, and entries can be deleted only during GC, | |
| 848 // so we cannot allow GC to occur while we're holding this entry. | |
| 849 // We're using a No_Safepoint_Verifier to catch any place where we | |
| 850 // might potentially do a GC at all. | |
| 851 // SystemDictionary::do_unloading() asserts that classes are only | |
| 852 // unloaded at a safepoint. | |
| 853 No_Safepoint_Verifier nosafepoint; | |
| 854 if (dictionary()->is_valid_protection_domain(d_index, d_hash, name, | |
| 855 class_loader, | |
| 856 protection_domain)) { | |
| 857 return k(); | |
| 858 } | |
| 859 } | |
| 860 | |
| 861 // Verify protection domain. If it fails an exception is thrown | |
| 862 validate_protection_domain(k, class_loader, protection_domain, CHECK_(klassOop(NULL))); | |
| 863 | |
| 864 return k(); | |
| 865 } | |
| 866 | |
| 867 | |
| 868 // This routine does not lock the system dictionary. | |
| 869 // | |
| 870 // Since readers don't hold a lock, we must make sure that system | |
| 871 // dictionary entries are only removed at a safepoint (when only one | |
| 872 // thread is running), and are added to in a safe way (all links must | |
| 873 // be updated in an MT-safe manner). | |
| 874 // | |
| 875 // Callers should be aware that an entry could be added just after | |
| 876 // _dictionary->bucket(index) is read here, so the caller will not see | |
| 877 // the new entry. | |
| 878 | |
|
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879 klassOop SystemDictionary::find(Symbol* class_name, |
| 0 | 880 Handle class_loader, |
| 881 Handle protection_domain, | |
| 882 TRAPS) { | |
| 883 | |
|
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884 // UseNewReflection |
|
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885 // The result of this call should be consistent with the result |
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886 // of the call to resolve_instance_class_or_null(). |
|
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887 // See evaluation 6790209 and 4474172 for more details. |
|
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888 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); |
|
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889 |
| 0 | 890 unsigned int d_hash = dictionary()->compute_hash(class_name, class_loader); |
| 891 int d_index = dictionary()->hash_to_index(d_hash); | |
| 892 | |
| 893 { | |
| 894 // Note that we have an entry, and entries can be deleted only during GC, | |
| 895 // so we cannot allow GC to occur while we're holding this entry. | |
| 896 // We're using a No_Safepoint_Verifier to catch any place where we | |
| 897 // might potentially do a GC at all. | |
| 898 // SystemDictionary::do_unloading() asserts that classes are only | |
| 899 // unloaded at a safepoint. | |
| 900 No_Safepoint_Verifier nosafepoint; | |
| 901 return dictionary()->find(d_index, d_hash, class_name, class_loader, | |
| 902 protection_domain, THREAD); | |
| 903 } | |
| 904 } | |
| 905 | |
| 906 | |
| 907 // Look for a loaded instance or array klass by name. Do not do any loading. | |
| 908 // return NULL in case of error. | |
|
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909 klassOop SystemDictionary::find_instance_or_array_klass(Symbol* class_name, |
| 0 | 910 Handle class_loader, |
| 911 Handle protection_domain, | |
| 912 TRAPS) { | |
| 913 klassOop k = NULL; | |
|
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914 assert(class_name != NULL, "class name must be non NULL"); |
|
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915 |
|
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916 // Try to get one of the well-known klasses. |
|
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917 if (LinkWellKnownClasses) { |
|
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918 k = find_well_known_klass(class_name); |
|
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919 if (k != NULL) { |
|
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920 return k; |
|
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921 } |
|
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922 } |
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923 |
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924 if (FieldType::is_array(class_name)) { |
| 0 | 925 // The name refers to an array. Parse the name. |
|
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926 // dimension and object_key in FieldArrayInfo are assigned as a |
|
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927 // side-effect of this call |
|
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928 FieldArrayInfo fd; |
|
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|
929 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
| 0 | 930 if (t != T_OBJECT) { |
| 931 k = Universe::typeArrayKlassObj(t); | |
| 932 } else { | |
|
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933 k = SystemDictionary::find(fd.object_key(), class_loader, protection_domain, THREAD); |
| 0 | 934 } |
| 935 if (k != NULL) { | |
|
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936 k = Klass::cast(k)->array_klass_or_null(fd.dimension()); |
| 0 | 937 } |
| 938 } else { | |
| 939 k = find(class_name, class_loader, protection_domain, THREAD); | |
| 940 } | |
| 941 return k; | |
| 942 } | |
| 943 | |
|
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944 // Quick range check for names of well-known classes: |
|
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945 static Symbol* wk_klass_name_limits[2] = {NULL, NULL}; |
|
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946 |
|
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947 #ifndef PRODUCT |
|
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948 static int find_wkk_calls, find_wkk_probes, find_wkk_wins; |
|
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949 // counts for "hello world": 3983, 1616, 1075 |
|
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950 // => 60% hit after limit guard, 25% total win rate |
|
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951 #endif |
|
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952 |
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953 klassOop SystemDictionary::find_well_known_klass(Symbol* class_name) { |
|
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954 // A bounds-check on class_name will quickly get a negative result. |
|
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955 NOT_PRODUCT(find_wkk_calls++); |
|
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956 if (class_name >= wk_klass_name_limits[0] && |
|
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957 class_name <= wk_klass_name_limits[1]) { |
|
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958 NOT_PRODUCT(find_wkk_probes++); |
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959 vmSymbols::SID sid = vmSymbols::find_sid(class_name); |
|
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960 if (sid != vmSymbols::NO_SID) { |
|
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961 klassOop k = NULL; |
|
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962 switch (sid) { |
|
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963 #define WK_KLASS_CASE(name, symbol, ignore_option) \ |
|
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964 case vmSymbols::VM_SYMBOL_ENUM_NAME(symbol): \ |
|
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965 k = WK_KLASS(name); break; |
|
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966 WK_KLASSES_DO(WK_KLASS_CASE) |
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967 #undef WK_KLASS_CASE |
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968 } |
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969 NOT_PRODUCT(if (k != NULL) find_wkk_wins++); |
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970 return k; |
|
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971 } |
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|
972 } |
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973 return NULL; |
|
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|
974 } |
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975 |
| 0 | 976 // Note: this method is much like resolve_from_stream, but |
| 977 // updates no supplemental data structures. | |
| 978 // TODO consolidate the two methods with a helper routine? | |
|
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979 klassOop SystemDictionary::parse_stream(Symbol* class_name, |
| 0 | 980 Handle class_loader, |
| 981 Handle protection_domain, | |
| 982 ClassFileStream* st, | |
|
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983 KlassHandle host_klass, |
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984 GrowableArray<Handle>* cp_patches, |
| 0 | 985 TRAPS) { |
|
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986 TempNewSymbol parsed_name = NULL; |
| 0 | 987 |
| 988 // Parse the stream. Note that we do this even though this klass might | |
| 989 // already be present in the SystemDictionary, otherwise we would not | |
| 990 // throw potential ClassFormatErrors. | |
| 991 // | |
| 992 // Note: "name" is updated. | |
| 993 // Further note: a placeholder will be added for this class when | |
| 994 // super classes are loaded (resolve_super_or_fail). We expect this | |
| 995 // to be called for all classes but java.lang.Object; and we preload | |
| 996 // java.lang.Object through resolve_or_fail, not this path. | |
| 997 | |
| 998 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
| 999 class_loader, | |
| 1000 protection_domain, | |
| 710 | 1001 host_klass, |
| 1002 cp_patches, | |
| 0 | 1003 parsed_name, |
|
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|
1004 true, |
| 0 | 1005 THREAD); |
| 1006 | |
| 1007 // We don't redefine the class, so we just need to clean up whether there | |
| 1008 // was an error or not (don't want to modify any system dictionary | |
| 1009 // data structures). | |
| 1010 // Parsed name could be null if we threw an error before we got far | |
| 1011 // enough along to parse it -- in that case, there is nothing to clean up. | |
|
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1012 if (parsed_name != NULL) { |
| 0 | 1013 unsigned int p_hash = placeholders()->compute_hash(parsed_name, |
| 1014 class_loader); | |
| 1015 int p_index = placeholders()->hash_to_index(p_hash); | |
| 1016 { | |
| 1017 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 1018 placeholders()->find_and_remove(p_index, p_hash, parsed_name, class_loader, THREAD); | |
| 1019 SystemDictionary_lock->notify_all(); | |
| 1020 } | |
| 1021 } | |
| 1022 | |
|
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1023 if (host_klass.not_null() && k.not_null()) { |
|
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1024 assert(EnableInvokeDynamic, ""); |
|
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1025 // If it's anonymous, initialize it now, since nobody else will. |
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1026 k->set_host_klass(host_klass()); |
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1027 |
|
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1028 { |
|
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1029 MutexLocker mu_r(Compile_lock, THREAD); |
|
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1030 |
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1031 // Add to class hierarchy, initialize vtables, and do possible |
|
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1032 // deoptimizations. |
|
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1033 add_to_hierarchy(k, CHECK_NULL); // No exception, but can block |
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1034 |
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1035 // But, do not add to system dictionary. |
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1036 } |
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1037 |
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1038 k->eager_initialize(THREAD); |
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1039 |
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1040 // notify jvmti |
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1041 if (JvmtiExport::should_post_class_load()) { |
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1042 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); |
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1043 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); |
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1044 } |
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1045 } |
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1046 |
| 0 | 1047 return k(); |
| 1048 } | |
| 1049 | |
| 1050 // Add a klass to the system from a stream (called by jni_DefineClass and | |
| 1051 // JVM_DefineClass). | |
| 1052 // Note: class_name can be NULL. In that case we do not know the name of | |
| 1053 // the class until we have parsed the stream. | |
| 1054 | |
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1055 klassOop SystemDictionary::resolve_from_stream(Symbol* class_name, |
| 0 | 1056 Handle class_loader, |
| 1057 Handle protection_domain, | |
| 1058 ClassFileStream* st, | |
|
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1059 bool verify, |
| 0 | 1060 TRAPS) { |
| 1061 | |
| 514 | 1062 // Classloaders that support parallelism, e.g. bootstrap classloader, |
| 1063 // or all classloaders with UnsyncloadClass do not acquire lock here | |
| 1064 bool DoObjectLock = true; | |
| 1065 if (is_parallelCapable(class_loader)) { | |
| 1066 DoObjectLock = false; | |
| 1067 } | |
| 1068 | |
| 1069 // Make sure we are synchronized on the class loader before we proceed | |
| 0 | 1070 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); |
| 1071 check_loader_lock_contention(lockObject, THREAD); | |
| 514 | 1072 ObjectLocker ol(lockObject, THREAD, DoObjectLock); |
| 0 | 1073 |
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1074 TempNewSymbol parsed_name = NULL; |
| 0 | 1075 |
| 1076 // Parse the stream. Note that we do this even though this klass might | |
| 1077 // already be present in the SystemDictionary, otherwise we would not | |
| 1078 // throw potential ClassFormatErrors. | |
| 1079 // | |
| 1080 // Note: "name" is updated. | |
| 1081 // Further note: a placeholder will be added for this class when | |
| 1082 // super classes are loaded (resolve_super_or_fail). We expect this | |
| 1083 // to be called for all classes but java.lang.Object; and we preload | |
| 1084 // java.lang.Object through resolve_or_fail, not this path. | |
| 1085 | |
| 1086 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
| 1087 class_loader, | |
| 1088 protection_domain, | |
| 1089 parsed_name, | |
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1090 verify, |
| 0 | 1091 THREAD); |
| 1092 | |
| 1093 const char* pkg = "java/"; | |
| 1094 if (!HAS_PENDING_EXCEPTION && | |
| 1095 !class_loader.is_null() && | |
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1096 parsed_name != NULL && |
| 0 | 1097 !strncmp((const char*)parsed_name->bytes(), pkg, strlen(pkg))) { |
| 1098 // It is illegal to define classes in the "java." package from | |
| 1099 // JVM_DefineClass or jni_DefineClass unless you're the bootclassloader | |
| 1100 ResourceMark rm(THREAD); | |
| 1101 char* name = parsed_name->as_C_string(); | |
| 1102 char* index = strrchr(name, '/'); | |
| 1103 *index = '\0'; // chop to just the package name | |
| 1104 while ((index = strchr(name, '/')) != NULL) { | |
| 1105 *index = '.'; // replace '/' with '.' in package name | |
| 1106 } | |
| 1107 const char* fmt = "Prohibited package name: %s"; | |
| 1108 size_t len = strlen(fmt) + strlen(name); | |
| 1109 char* message = NEW_RESOURCE_ARRAY(char, len); | |
| 1110 jio_snprintf(message, len, fmt, name); | |
| 1111 Exceptions::_throw_msg(THREAD_AND_LOCATION, | |
| 1112 vmSymbols::java_lang_SecurityException(), message); | |
| 1113 } | |
| 1114 | |
| 1115 if (!HAS_PENDING_EXCEPTION) { | |
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1116 assert(parsed_name != NULL, "Sanity"); |
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1117 assert(class_name == NULL || class_name == parsed_name, "name mismatch"); |
| 0 | 1118 // Verification prevents us from creating names with dots in them, this |
| 1119 // asserts that that's the case. | |
| 1120 assert(is_internal_format(parsed_name), | |
| 1121 "external class name format used internally"); | |
| 1122 | |
| 1123 // Add class just loaded | |
| 514 | 1124 // If a class loader supports parallel classloading handle parallel define requests |
| 1125 // find_or_define_instance_class may return a different instanceKlass | |
| 1126 if (is_parallelCapable(class_loader)) { | |
| 1127 k = find_or_define_instance_class(class_name, class_loader, k, THREAD); | |
| 1128 } else { | |
| 1129 define_instance_class(k, THREAD); | |
| 1130 } | |
| 0 | 1131 } |
| 1132 | |
| 1133 // If parsing the class file or define_instance_class failed, we | |
| 1134 // need to remove the placeholder added on our behalf. But we | |
| 1135 // must make sure parsed_name is valid first (it won't be if we had | |
| 1136 // a format error before the class was parsed far enough to | |
| 1137 // find the name). | |
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1138 if (HAS_PENDING_EXCEPTION && parsed_name != NULL) { |
| 0 | 1139 unsigned int p_hash = placeholders()->compute_hash(parsed_name, |
| 1140 class_loader); | |
| 1141 int p_index = placeholders()->hash_to_index(p_hash); | |
| 1142 { | |
| 1143 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 1144 placeholders()->find_and_remove(p_index, p_hash, parsed_name, class_loader, THREAD); | |
| 1145 SystemDictionary_lock->notify_all(); | |
| 1146 } | |
| 1147 return NULL; | |
| 1148 } | |
| 1149 | |
| 1150 // Make sure that we didn't leave a place holder in the | |
| 1151 // SystemDictionary; this is only done on success | |
| 1152 debug_only( { | |
| 1153 if (!HAS_PENDING_EXCEPTION) { | |
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1154 assert(parsed_name != NULL, "parsed_name is still null?"); |
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1155 Symbol* h_name = k->name(); |
| 0 | 1156 Handle h_loader (THREAD, k->class_loader()); |
| 1157 | |
| 1158 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 1159 | |
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1160 klassOop check = find_class(parsed_name, class_loader); |
| 0 | 1161 assert(check == k(), "should be present in the dictionary"); |
| 1162 | |
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1163 klassOop check2 = find_class(h_name, h_loader); |
| 0 | 1164 assert(check == check2, "name inconsistancy in SystemDictionary"); |
| 1165 } | |
| 1166 } ); | |
| 1167 | |
| 1168 return k(); | |
| 1169 } | |
| 1170 | |
| 1171 | |
| 1172 void SystemDictionary::set_shared_dictionary(HashtableBucket* t, int length, | |
| 1173 int number_of_entries) { | |
| 1174 assert(length == _nof_buckets * sizeof(HashtableBucket), | |
| 1175 "bad shared dictionary size."); | |
| 1176 _shared_dictionary = new Dictionary(_nof_buckets, t, number_of_entries); | |
| 1177 } | |
| 1178 | |
| 1179 | |
| 1180 // If there is a shared dictionary, then find the entry for the | |
| 1181 // given shared system class, if any. | |
| 1182 | |
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1183 klassOop SystemDictionary::find_shared_class(Symbol* class_name) { |
| 0 | 1184 if (shared_dictionary() != NULL) { |
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1185 unsigned int d_hash = shared_dictionary()->compute_hash(class_name, Handle()); |
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1186 int d_index = shared_dictionary()->hash_to_index(d_hash); |
| 0 | 1187 return shared_dictionary()->find_shared_class(d_index, d_hash, class_name); |
| 1188 } else { | |
| 1189 return NULL; | |
| 1190 } | |
| 1191 } | |
| 1192 | |
| 1193 | |
| 1194 // Load a class from the shared spaces (found through the shared system | |
| 1195 // dictionary). Force the superclass and all interfaces to be loaded. | |
| 1196 // Update the class definition to include sibling classes and no | |
| 1197 // subclasses (yet). [Classes in the shared space are not part of the | |
| 1198 // object hierarchy until loaded.] | |
| 1199 | |
| 1200 instanceKlassHandle SystemDictionary::load_shared_class( | |
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1201 Symbol* class_name, Handle class_loader, TRAPS) { |
| 0 | 1202 instanceKlassHandle ik (THREAD, find_shared_class(class_name)); |
| 1203 return load_shared_class(ik, class_loader, THREAD); | |
| 1204 } | |
| 1205 | |
| 1206 // Note well! Changes to this method may affect oop access order | |
| 1207 // in the shared archive. Please take care to not make changes that | |
| 1208 // adversely affect cold start time by changing the oop access order | |
| 1209 // that is specified in dump.cpp MarkAndMoveOrderedReadOnly and | |
| 1210 // MarkAndMoveOrderedReadWrite closures. | |
| 1211 instanceKlassHandle SystemDictionary::load_shared_class( | |
| 1212 instanceKlassHandle ik, Handle class_loader, TRAPS) { | |
| 1213 assert(class_loader.is_null(), "non-null classloader for shared class?"); | |
| 1214 if (ik.not_null()) { | |
| 1215 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1216 Symbol* class_name = ik->name(); |
| 0 | 1217 |
| 1218 // Found the class, now load the superclass and interfaces. If they | |
| 1219 // are shared, add them to the main system dictionary and reset | |
| 1220 // their hierarchy references (supers, subs, and interfaces). | |
| 1221 | |
| 1222 if (ik->super() != NULL) { | |
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1223 Symbol* cn = ik->super()->klass_part()->name(); |
| 0 | 1224 resolve_super_or_fail(class_name, cn, |
| 1225 class_loader, Handle(), true, CHECK_(nh)); | |
| 1226 } | |
| 1227 | |
| 1228 objArrayHandle interfaces (THREAD, ik->local_interfaces()); | |
| 1229 int num_interfaces = interfaces->length(); | |
| 1230 for (int index = 0; index < num_interfaces; index++) { | |
| 1231 klassOop k = klassOop(interfaces->obj_at(index)); | |
| 1232 | |
| 1233 // Note: can not use instanceKlass::cast here because | |
| 1234 // interfaces' instanceKlass's C++ vtbls haven't been | |
| 1235 // reinitialized yet (they will be once the interface classes | |
| 1236 // are loaded) | |
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1237 Symbol* name = k->klass_part()->name(); |
| 0 | 1238 resolve_super_or_fail(class_name, name, class_loader, Handle(), false, CHECK_(nh)); |
| 1239 } | |
| 1240 | |
| 1241 // Adjust methods to recover missing data. They need addresses for | |
| 1242 // interpreter entry points and their default native method address | |
| 1243 // must be reset. | |
| 1244 | |
| 1245 // Updating methods must be done under a lock so multiple | |
| 1246 // threads don't update these in parallel | |
| 1247 // Shared classes are all currently loaded by the bootstrap | |
| 1248 // classloader, so this will never cause a deadlock on | |
| 1249 // a custom class loader lock. | |
| 1250 | |
| 1251 { | |
| 1252 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
| 1253 check_loader_lock_contention(lockObject, THREAD); | |
| 1254 ObjectLocker ol(lockObject, THREAD, true); | |
| 1255 | |
| 1256 objArrayHandle methods (THREAD, ik->methods()); | |
| 1257 int num_methods = methods->length(); | |
| 1258 for (int index2 = 0; index2 < num_methods; ++index2) { | |
| 1259 methodHandle m(THREAD, methodOop(methods->obj_at(index2))); | |
| 1260 m()->link_method(m, CHECK_(nh)); | |
| 1261 } | |
|
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1262 if (JvmtiExport::has_redefined_a_class()) { |
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1263 // Reinitialize vtable because RedefineClasses may have changed some |
|
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1264 // entries in this vtable for super classes so the CDS vtable might |
|
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1265 // point to old or obsolete entries. RedefineClasses doesn't fix up |
|
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1266 // vtables in the shared system dictionary, only the main one. |
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1267 // It also redefines the itable too so fix that too. |
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1268 ResourceMark rm(THREAD); |
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1269 ik->vtable()->initialize_vtable(false, CHECK_(nh)); |
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1270 ik->itable()->initialize_itable(false, CHECK_(nh)); |
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1271 } |
| 0 | 1272 } |
| 1273 | |
| 1274 if (TraceClassLoading) { | |
| 1275 ResourceMark rm; | |
| 1276 tty->print("[Loaded %s", ik->external_name()); | |
| 1277 tty->print(" from shared objects file"); | |
| 1278 tty->print_cr("]"); | |
| 1279 } | |
| 1280 // notify a class loaded from shared object | |
| 1281 ClassLoadingService::notify_class_loaded(instanceKlass::cast(ik()), | |
| 1282 true /* shared class */); | |
| 1283 } | |
| 1284 return ik; | |
| 1285 } | |
| 1286 | |
| 1287 #ifdef KERNEL | |
| 1288 // Some classes on the bootstrap class path haven't been installed on the | |
| 1289 // system yet. Call the DownloadManager method to make them appear in the | |
| 1290 // bootstrap class path and try again to load the named class. | |
| 1291 // Note that with delegation class loaders all classes in another loader will | |
| 1292 // first try to call this so it'd better be fast!! | |
| 1293 static instanceKlassHandle download_and_retry_class_load( | |
|
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1294 Symbol* class_name, |
| 0 | 1295 TRAPS) { |
| 1296 | |
| 3938 | 1297 klassOop dlm = SystemDictionary::DownloadManager_klass(); |
| 0 | 1298 instanceKlassHandle nk; |
| 1299 | |
| 1300 // If download manager class isn't loaded just return. | |
| 1301 if (dlm == NULL) return nk; | |
| 1302 | |
| 1303 { HandleMark hm(THREAD); | |
| 1304 ResourceMark rm(THREAD); | |
| 1305 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nk)); | |
| 1306 Handle class_string = java_lang_String::externalize_classname(s, CHECK_(nk)); | |
| 1307 | |
| 1308 // return value | |
| 1309 JavaValue result(T_OBJECT); | |
| 1310 | |
| 1311 // Call the DownloadManager. We assume that it has a lock because | |
| 1312 // multiple classes could be not found and downloaded at the same time. | |
| 1313 // class sun.misc.DownloadManager; | |
| 1314 // public static String getBootClassPathEntryForClass(String className); | |
| 1315 JavaCalls::call_static(&result, | |
| 1316 KlassHandle(THREAD, dlm), | |
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1317 vmSymbols::getBootClassPathEntryForClass_name(), |
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1318 vmSymbols::string_string_signature(), |
| 0 | 1319 class_string, |
| 1320 CHECK_(nk)); | |
| 1321 | |
| 1322 // Get result.string and add to bootclasspath | |
| 1323 assert(result.get_type() == T_OBJECT, "just checking"); | |
| 1324 oop obj = (oop) result.get_jobject(); | |
| 1325 if (obj == NULL) { return nk; } | |
| 1326 | |
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1327 Handle h_obj(THREAD, obj); |
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1328 char* new_class_name = java_lang_String::as_platform_dependent_str(h_obj, |
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1329 CHECK_(nk)); |
| 0 | 1330 |
| 1331 // lock the loader | |
| 1332 // we use this lock because JVMTI does. | |
| 1333 Handle loader_lock(THREAD, SystemDictionary::system_loader_lock()); | |
| 1334 | |
| 1335 ObjectLocker ol(loader_lock, THREAD); | |
| 1336 // add the file to the bootclasspath | |
| 1337 ClassLoader::update_class_path_entry_list(new_class_name, true); | |
| 1338 } // end HandleMark | |
| 1339 | |
| 1340 if (TraceClassLoading) { | |
| 1341 ClassLoader::print_bootclasspath(); | |
| 1342 } | |
| 1343 return ClassLoader::load_classfile(class_name, CHECK_(nk)); | |
| 1344 } | |
| 1345 #endif // KERNEL | |
| 1346 | |
| 1347 | |
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1348 instanceKlassHandle SystemDictionary::load_instance_class(Symbol* class_name, Handle class_loader, TRAPS) { |
| 0 | 1349 instanceKlassHandle nh = instanceKlassHandle(); // null Handle |
| 1350 if (class_loader.is_null()) { | |
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1351 |
| 0 | 1352 // Search the shared system dictionary for classes preloaded into the |
| 1353 // shared spaces. | |
| 1354 instanceKlassHandle k; | |
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1355 { |
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1356 PerfTraceTime vmtimer(ClassLoader::perf_shared_classload_time()); |
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1357 k = load_shared_class(class_name, class_loader, THREAD); |
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1358 } |
| 0 | 1359 |
| 1360 if (k.is_null()) { | |
| 1361 // Use VM class loader | |
|
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1362 PerfTraceTime vmtimer(ClassLoader::perf_sys_classload_time()); |
| 0 | 1363 k = ClassLoader::load_classfile(class_name, CHECK_(nh)); |
| 1364 } | |
| 1365 | |
| 1366 #ifdef KERNEL | |
| 1367 // If the VM class loader has failed to load the class, call the | |
| 1368 // DownloadManager class to make it magically appear on the classpath | |
| 1369 // and try again. This is only configured with the Kernel VM. | |
| 1370 if (k.is_null()) { | |
| 1371 k = download_and_retry_class_load(class_name, CHECK_(nh)); | |
| 1372 } | |
| 1373 #endif // KERNEL | |
| 1374 | |
| 514 | 1375 // find_or_define_instance_class may return a different instanceKlass |
| 0 | 1376 if (!k.is_null()) { |
| 1377 k = find_or_define_instance_class(class_name, class_loader, k, CHECK_(nh)); | |
| 1378 } | |
| 1379 return k; | |
| 1380 } else { | |
| 1381 // Use user specified class loader to load class. Call loadClass operation on class_loader. | |
| 1382 ResourceMark rm(THREAD); | |
| 1383 | |
|
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1384 assert(THREAD->is_Java_thread(), "must be a JavaThread"); |
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1385 JavaThread* jt = (JavaThread*) THREAD; |
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1386 |
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1387 PerfClassTraceTime vmtimer(ClassLoader::perf_app_classload_time(), |
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1388 ClassLoader::perf_app_classload_selftime(), |
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1389 ClassLoader::perf_app_classload_count(), |
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1390 jt->get_thread_stat()->perf_recursion_counts_addr(), |
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1391 jt->get_thread_stat()->perf_timers_addr(), |
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1392 PerfClassTraceTime::CLASS_LOAD); |
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1393 |
| 0 | 1394 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nh)); |
| 1395 // Translate to external class name format, i.e., convert '/' chars to '.' | |
| 1396 Handle string = java_lang_String::externalize_classname(s, CHECK_(nh)); | |
| 1397 | |
| 1398 JavaValue result(T_OBJECT); | |
| 1399 | |
| 1142 | 1400 KlassHandle spec_klass (THREAD, SystemDictionary::ClassLoader_klass()); |
| 0 | 1401 |
| 514 | 1402 // Call public unsynchronized loadClass(String) directly for all class loaders |
| 1403 // for parallelCapable class loaders. JDK >=7, loadClass(String, boolean) will | |
| 1404 // acquire a class-name based lock rather than the class loader object lock. | |
| 1405 // JDK < 7 already acquire the class loader lock in loadClass(String, boolean), | |
| 1406 // so the call to loadClassInternal() was not required. | |
| 1407 // | |
| 1408 // UnsyncloadClass flag means both call loadClass(String) and do | |
| 1409 // not acquire the class loader lock even for class loaders that are | |
| 1410 // not parallelCapable. This was a risky transitional | |
| 1411 // flag for diagnostic purposes only. It is risky to call | |
| 0 | 1412 // custom class loaders without synchronization. |
| 1413 // WARNING If a custom class loader does NOT synchronizer findClass, or callers of | |
| 514 | 1414 // findClass, the UnsyncloadClass flag risks unexpected timing bugs in the field. |
| 0 | 1415 // Do NOT assume this will be supported in future releases. |
| 514 | 1416 // |
| 1417 // Added MustCallLoadClassInternal in case we discover in the field | |
| 1418 // a customer that counts on this call | |
| 1419 if (MustCallLoadClassInternal && has_loadClassInternal()) { | |
| 0 | 1420 JavaCalls::call_special(&result, |
| 1421 class_loader, | |
| 1422 spec_klass, | |
|
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1423 vmSymbols::loadClassInternal_name(), |
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1424 vmSymbols::string_class_signature(), |
| 0 | 1425 string, |
| 1426 CHECK_(nh)); | |
| 1427 } else { | |
| 1428 JavaCalls::call_virtual(&result, | |
| 1429 class_loader, | |
| 1430 spec_klass, | |
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1431 vmSymbols::loadClass_name(), |
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1432 vmSymbols::string_class_signature(), |
| 0 | 1433 string, |
| 1434 CHECK_(nh)); | |
| 1435 } | |
| 1436 | |
| 1437 assert(result.get_type() == T_OBJECT, "just checking"); | |
| 1438 oop obj = (oop) result.get_jobject(); | |
| 1439 | |
| 1440 // Primitive classes return null since forName() can not be | |
| 1441 // used to obtain any of the Class objects representing primitives or void | |
| 1442 if ((obj != NULL) && !(java_lang_Class::is_primitive(obj))) { | |
| 1443 instanceKlassHandle k = | |
| 1444 instanceKlassHandle(THREAD, java_lang_Class::as_klassOop(obj)); | |
| 1445 // For user defined Java class loaders, check that the name returned is | |
| 1446 // the same as that requested. This check is done for the bootstrap | |
| 1447 // loader when parsing the class file. | |
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1448 if (class_name == k->name()) { |
| 0 | 1449 return k; |
| 1450 } | |
| 1451 } | |
| 1452 // Class is not found or has the wrong name, return NULL | |
| 1453 return nh; | |
| 1454 } | |
| 1455 } | |
| 1456 | |
| 1457 void SystemDictionary::define_instance_class(instanceKlassHandle k, TRAPS) { | |
| 1458 | |
| 1459 Handle class_loader_h(THREAD, k->class_loader()); | |
| 1460 | |
| 514 | 1461 // for bootstrap and other parallel classloaders don't acquire lock, |
| 1462 // use placeholder token | |
| 1463 // If a parallelCapable class loader calls define_instance_class instead of | |
| 1464 // find_or_define_instance_class to get here, we have a timing | |
| 1465 // hole with systemDictionary updates and check_constraints | |
| 1466 if (!class_loader_h.is_null() && !is_parallelCapable(class_loader_h)) { | |
| 0 | 1467 assert(ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, |
| 1468 compute_loader_lock_object(class_loader_h, THREAD)), | |
| 1469 "define called without lock"); | |
| 1470 } | |
| 1471 | |
| 1472 // Check class-loading constraints. Throw exception if violation is detected. | |
| 1473 // Grabs and releases SystemDictionary_lock | |
| 1474 // The check_constraints/find_class call and update_dictionary sequence | |
| 1475 // must be "atomic" for a specific class/classloader pair so we never | |
| 1476 // define two different instanceKlasses for that class/classloader pair. | |
| 1477 // Existing classloaders will call define_instance_class with the | |
| 1478 // classloader lock held | |
| 1479 // Parallel classloaders will call find_or_define_instance_class | |
| 1480 // which will require a token to perform the define class | |
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1481 Symbol* name_h = k->name(); |
| 0 | 1482 unsigned int d_hash = dictionary()->compute_hash(name_h, class_loader_h); |
| 1483 int d_index = dictionary()->hash_to_index(d_hash); | |
| 1484 check_constraints(d_index, d_hash, k, class_loader_h, true, CHECK); | |
| 1485 | |
| 1486 // Register class just loaded with class loader (placed in Vector) | |
| 1487 // Note we do this before updating the dictionary, as this can | |
| 1488 // fail with an OutOfMemoryError (if it does, we will *not* put this | |
| 1489 // class in the dictionary and will not update the class hierarchy). | |
| 1490 if (k->class_loader() != NULL) { | |
| 1491 methodHandle m(THREAD, Universe::loader_addClass_method()); | |
| 1492 JavaValue result(T_VOID); | |
| 1493 JavaCallArguments args(class_loader_h); | |
| 1494 args.push_oop(Handle(THREAD, k->java_mirror())); | |
| 1495 JavaCalls::call(&result, m, &args, CHECK); | |
| 1496 } | |
| 1497 | |
| 1498 // Add the new class. We need recompile lock during update of CHA. | |
| 1499 { | |
| 1500 unsigned int p_hash = placeholders()->compute_hash(name_h, class_loader_h); | |
| 1501 int p_index = placeholders()->hash_to_index(p_hash); | |
| 1502 | |
| 1503 MutexLocker mu_r(Compile_lock, THREAD); | |
| 1504 | |
| 1505 // Add to class hierarchy, initialize vtables, and do possible | |
| 1506 // deoptimizations. | |
| 1507 add_to_hierarchy(k, CHECK); // No exception, but can block | |
| 1508 | |
| 1509 // Add to systemDictionary - so other classes can see it. | |
| 1510 // Grabs and releases SystemDictionary_lock | |
| 1511 update_dictionary(d_index, d_hash, p_index, p_hash, | |
| 1512 k, class_loader_h, THREAD); | |
| 1513 } | |
| 1514 k->eager_initialize(THREAD); | |
| 1515 | |
| 1516 // notify jvmti | |
| 1517 if (JvmtiExport::should_post_class_load()) { | |
| 1518 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); | |
| 1519 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); | |
| 1520 | |
| 1521 } | |
| 1522 } | |
| 1523 | |
| 1524 // Support parallel classloading | |
|
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1525 // All parallel class loaders, including bootstrap classloader |
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1526 // lock a placeholder entry for this class/class_loader pair |
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1527 // to allow parallel defines of different classes for this class loader |
| 514 | 1528 // With AllowParallelDefine flag==true, in case they do not synchronize around |
| 1529 // FindLoadedClass/DefineClass, calls, we check for parallel | |
| 0 | 1530 // loading for them, wait if a defineClass is in progress |
| 1531 // and return the initial requestor's results | |
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1532 // This flag does not apply to the bootstrap classloader. |
| 514 | 1533 // With AllowParallelDefine flag==false, call through to define_instance_class |
| 1534 // which will throw LinkageError: duplicate class definition. | |
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1535 // False is the requested default. |
| 0 | 1536 // For better performance, the class loaders should synchronize |
| 514 | 1537 // findClass(), i.e. FindLoadedClass/DefineClassIfAbsent or they |
| 0 | 1538 // potentially waste time reading and parsing the bytestream. |
| 1539 // Note: VM callers should ensure consistency of k/class_name,class_loader | |
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1540 instanceKlassHandle SystemDictionary::find_or_define_instance_class(Symbol* class_name, Handle class_loader, instanceKlassHandle k, TRAPS) { |
| 0 | 1541 |
| 1542 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1543 Symbol* name_h = k->name(); // passed in class_name may be null |
| 0 | 1544 |
| 515 | 1545 unsigned int d_hash = dictionary()->compute_hash(name_h, class_loader); |
| 0 | 1546 int d_index = dictionary()->hash_to_index(d_hash); |
| 1547 | |
| 1548 // Hold SD lock around find_class and placeholder creation for DEFINE_CLASS | |
| 515 | 1549 unsigned int p_hash = placeholders()->compute_hash(name_h, class_loader); |
| 0 | 1550 int p_index = placeholders()->hash_to_index(p_hash); |
| 1551 PlaceholderEntry* probe; | |
| 1552 | |
| 1553 { | |
| 1554 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 1555 // First check if class already defined | |
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1556 if (UnsyncloadClass || (is_parallelDefine(class_loader))) { |
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1557 klassOop check = find_class(d_index, d_hash, name_h, class_loader); |
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1558 if (check != NULL) { |
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1559 return(instanceKlassHandle(THREAD, check)); |
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1560 } |
| 0 | 1561 } |
| 1562 | |
| 1563 // Acquire define token for this class/classloader | |
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1564 probe = placeholders()->find_and_add(p_index, p_hash, name_h, class_loader, PlaceholderTable::DEFINE_CLASS, NULL, THREAD); |
| 514 | 1565 // Wait if another thread defining in parallel |
| 1566 // All threads wait - even those that will throw duplicate class: otherwise | |
| 1567 // caller is surprised by LinkageError: duplicate, but findLoadedClass fails | |
| 1568 // if other thread has not finished updating dictionary | |
| 1569 while (probe->definer() != NULL) { | |
| 1570 SystemDictionary_lock->wait(); | |
| 1571 } | |
| 1572 // Only special cases allow parallel defines and can use other thread's results | |
| 1573 // Other cases fall through, and may run into duplicate defines | |
| 1574 // caught by finding an entry in the SystemDictionary | |
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1575 if ((UnsyncloadClass || is_parallelDefine(class_loader)) && (probe->instanceKlass() != NULL)) { |
| 0 | 1576 probe->remove_seen_thread(THREAD, PlaceholderTable::DEFINE_CLASS); |
| 515 | 1577 placeholders()->find_and_remove(p_index, p_hash, name_h, class_loader, THREAD); |
| 514 | 1578 SystemDictionary_lock->notify_all(); |
| 0 | 1579 #ifdef ASSERT |
| 515 | 1580 klassOop check = find_class(d_index, d_hash, name_h, class_loader); |
| 514 | 1581 assert(check != NULL, "definer missed recording success"); |
| 0 | 1582 #endif |
| 514 | 1583 return(instanceKlassHandle(THREAD, probe->instanceKlass())); |
| 0 | 1584 } else { |
| 514 | 1585 // This thread will define the class (even if earlier thread tried and had an error) |
| 1586 probe->set_definer(THREAD); | |
| 0 | 1587 } |
| 1588 } | |
| 1589 | |
| 1590 define_instance_class(k, THREAD); | |
| 1591 | |
| 1592 Handle linkage_exception = Handle(); // null handle | |
| 1593 | |
| 1594 // definer must notify any waiting threads | |
| 1595 { | |
| 1596 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 515 | 1597 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name_h, class_loader); |
| 0 | 1598 assert(probe != NULL, "DEFINE_CLASS placeholder lost?"); |
| 1599 if (probe != NULL) { | |
| 1600 if (HAS_PENDING_EXCEPTION) { | |
| 1601 linkage_exception = Handle(THREAD,PENDING_EXCEPTION); | |
| 1602 CLEAR_PENDING_EXCEPTION; | |
| 1603 } else { | |
| 1604 probe->set_instanceKlass(k()); | |
| 1605 } | |
| 1606 probe->set_definer(NULL); | |
| 1607 probe->remove_seen_thread(THREAD, PlaceholderTable::DEFINE_CLASS); | |
| 515 | 1608 placeholders()->find_and_remove(p_index, p_hash, name_h, class_loader, THREAD); |
| 0 | 1609 SystemDictionary_lock->notify_all(); |
| 1610 } | |
| 1611 } | |
| 1612 | |
| 1613 // Can't throw exception while holding lock due to rank ordering | |
| 1614 if (linkage_exception() != NULL) { | |
| 1615 THROW_OOP_(linkage_exception(), nh); // throws exception and returns | |
| 1616 } | |
| 1617 | |
| 1618 return k; | |
| 1619 } | |
| 1620 Handle SystemDictionary::compute_loader_lock_object(Handle class_loader, TRAPS) { | |
| 1621 // If class_loader is NULL we synchronize on _system_loader_lock_obj | |
| 1622 if (class_loader.is_null()) { | |
| 1623 return Handle(THREAD, _system_loader_lock_obj); | |
| 1624 } else { | |
| 1625 return class_loader; | |
| 1626 } | |
| 1627 } | |
| 1628 | |
| 1629 // This method is added to check how often we have to wait to grab loader | |
| 1630 // lock. The results are being recorded in the performance counters defined in | |
| 1631 // ClassLoader::_sync_systemLoaderLockContentionRate and | |
| 1632 // ClassLoader::_sync_nonSystemLoaderLockConteionRate. | |
| 1633 void SystemDictionary::check_loader_lock_contention(Handle loader_lock, TRAPS) { | |
| 1634 if (!UsePerfData) { | |
| 1635 return; | |
| 1636 } | |
| 1637 | |
| 1638 assert(!loader_lock.is_null(), "NULL lock object"); | |
| 1639 | |
| 1640 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader_lock) | |
| 1641 == ObjectSynchronizer::owner_other) { | |
| 1642 // contention will likely happen, so increment the corresponding | |
| 1643 // contention counter. | |
| 1644 if (loader_lock() == _system_loader_lock_obj) { | |
| 1645 ClassLoader::sync_systemLoaderLockContentionRate()->inc(); | |
| 1646 } else { | |
| 1647 ClassLoader::sync_nonSystemLoaderLockContentionRate()->inc(); | |
| 1648 } | |
| 1649 } | |
| 1650 } | |
| 1651 | |
| 1652 // ---------------------------------------------------------------------------- | |
| 1653 // Lookup | |
| 1654 | |
| 1655 klassOop SystemDictionary::find_class(int index, unsigned int hash, | |
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1656 Symbol* class_name, |
| 0 | 1657 Handle class_loader) { |
| 1658 assert_locked_or_safepoint(SystemDictionary_lock); | |
| 1659 assert (index == dictionary()->index_for(class_name, class_loader), | |
| 1660 "incorrect index?"); | |
| 1661 | |
| 1662 klassOop k = dictionary()->find_class(index, hash, class_name, class_loader); | |
| 1663 return k; | |
| 1664 } | |
| 1665 | |
| 1666 | |
| 1667 // Basic find on classes in the midst of being loaded | |
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1668 Symbol* SystemDictionary::find_placeholder(Symbol* class_name, |
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1669 Handle class_loader) { |
| 0 | 1670 assert_locked_or_safepoint(SystemDictionary_lock); |
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1671 unsigned int p_hash = placeholders()->compute_hash(class_name, class_loader); |
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1672 int p_index = placeholders()->hash_to_index(p_hash); |
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1673 return placeholders()->find_entry(p_index, p_hash, class_name, class_loader); |
| 0 | 1674 } |
| 1675 | |
| 1676 | |
| 1677 // Used for assertions and verification only | |
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1678 klassOop SystemDictionary::find_class(Symbol* class_name, Handle class_loader) { |
| 0 | 1679 #ifndef ASSERT |
| 1680 guarantee(VerifyBeforeGC || | |
| 1681 VerifyDuringGC || | |
| 1682 VerifyBeforeExit || | |
| 1683 VerifyAfterGC, "too expensive"); | |
| 1684 #endif | |
| 1685 assert_locked_or_safepoint(SystemDictionary_lock); | |
| 1686 | |
| 1687 // First look in the loaded class array | |
| 1688 unsigned int d_hash = dictionary()->compute_hash(class_name, class_loader); | |
| 1689 int d_index = dictionary()->hash_to_index(d_hash); | |
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1690 return find_class(d_index, d_hash, class_name, class_loader); |
| 0 | 1691 } |
| 1692 | |
| 1693 | |
| 1694 // Get the next class in the diictionary. | |
| 1695 klassOop SystemDictionary::try_get_next_class() { | |
| 1696 return dictionary()->try_get_next_class(); | |
| 1697 } | |
| 1698 | |
| 1699 | |
| 1700 // ---------------------------------------------------------------------------- | |
| 1701 // Update hierachy. This is done before the new klass has been added to the SystemDictionary. The Recompile_lock | |
| 1702 // is held, to ensure that the compiler is not using the class hierachy, and that deoptimization will kick in | |
| 1703 // before a new class is used. | |
| 1704 | |
| 1705 void SystemDictionary::add_to_hierarchy(instanceKlassHandle k, TRAPS) { | |
| 1706 assert(k.not_null(), "just checking"); | |
|
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1707 assert_locked_or_safepoint(Compile_lock); |
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1708 |
| 0 | 1709 // Link into hierachy. Make sure the vtables are initialized before linking into |
| 1710 k->append_to_sibling_list(); // add to superklass/sibling list | |
| 1711 k->process_interfaces(THREAD); // handle all "implements" declarations | |
| 1712 k->set_init_state(instanceKlass::loaded); | |
| 1713 // Now flush all code that depended on old class hierarchy. | |
| 1714 // Note: must be done *after* linking k into the hierarchy (was bug 12/9/97) | |
| 1715 // Also, first reinitialize vtable because it may have gotten out of synch | |
| 1716 // while the new class wasn't connected to the class hierarchy. | |
| 1717 Universe::flush_dependents_on(k); | |
| 1718 } | |
| 1719 | |
| 1720 | |
| 1721 // ---------------------------------------------------------------------------- | |
| 1722 // GC support | |
| 1723 | |
| 1724 // Following roots during mark-sweep is separated in two phases. | |
| 1725 // | |
| 1726 // The first phase follows preloaded classes and all other system | |
| 1727 // classes, since these will never get unloaded anyway. | |
| 1728 // | |
| 1729 // The second phase removes (unloads) unreachable classes from the | |
| 1730 // system dictionary and follows the remaining classes' contents. | |
| 1731 | |
| 1732 void SystemDictionary::always_strong_oops_do(OopClosure* blk) { | |
| 1733 // Follow preloaded classes/mirrors and system loader object | |
| 1734 blk->do_oop(&_java_system_loader); | |
| 1735 preloaded_oops_do(blk); | |
| 1736 always_strong_classes_do(blk); | |
| 1737 } | |
| 1738 | |
| 1739 | |
| 1740 void SystemDictionary::always_strong_classes_do(OopClosure* blk) { | |
| 1741 // Follow all system classes and temporary placeholders in dictionary | |
| 1742 dictionary()->always_strong_classes_do(blk); | |
| 1743 | |
| 1744 // Placeholders. These are *always* strong roots, as they | |
| 1745 // represent classes we're actively loading. | |
| 1746 placeholders_do(blk); | |
| 1747 | |
| 710 | 1748 // Visit extra methods |
| 1903 | 1749 invoke_method_table()->oops_do(blk); |
| 0 | 1750 } |
| 1751 | |
| 1752 | |
| 1753 void SystemDictionary::placeholders_do(OopClosure* blk) { | |
| 1754 placeholders()->oops_do(blk); | |
| 1755 } | |
| 1756 | |
|
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1757 // Calculate a "good" systemdictionary size based |
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1758 // on predicted or current loaded classes count |
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1759 int SystemDictionary::calculate_systemdictionary_size(int classcount) { |
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1760 int newsize = _old_default_sdsize; |
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1761 if ((classcount > 0) && !DumpSharedSpaces) { |
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1762 int desiredsize = classcount/_average_depth_goal; |
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1763 for (newsize = _primelist[_sdgeneration]; _sdgeneration < _prime_array_size -1; |
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1764 newsize = _primelist[++_sdgeneration]) { |
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1765 if (desiredsize <= newsize) { |
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1766 break; |
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1767 } |
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1768 } |
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1769 } |
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1770 return newsize; |
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1771 } |
| 0 | 1772 bool SystemDictionary::do_unloading(BoolObjectClosure* is_alive) { |
| 1773 bool result = dictionary()->do_unloading(is_alive); | |
| 1774 constraints()->purge_loader_constraints(is_alive); | |
| 1775 resolution_errors()->purge_resolution_errors(is_alive); | |
| 1776 return result; | |
| 1777 } | |
| 1778 | |
| 1779 | |
| 1780 // The mirrors are scanned by shared_oops_do() which is | |
| 1781 // not called by oops_do(). In order to process oops in | |
| 1782 // a necessary order, shared_oops_do() is call by | |
| 1783 // Universe::oops_do(). | |
| 1784 void SystemDictionary::oops_do(OopClosure* f) { | |
| 1785 // Adjust preloaded classes and system loader object | |
| 1786 f->do_oop(&_java_system_loader); | |
| 1787 preloaded_oops_do(f); | |
| 1788 | |
| 1789 lazily_loaded_oops_do(f); | |
| 1790 | |
| 1791 // Adjust dictionary | |
| 1792 dictionary()->oops_do(f); | |
| 1793 | |
| 710 | 1794 // Visit extra methods |
| 1903 | 1795 invoke_method_table()->oops_do(f); |
| 710 | 1796 |
| 0 | 1797 // Partially loaded classes |
| 1798 placeholders()->oops_do(f); | |
| 1799 | |
| 1800 // Adjust constraint table | |
| 1801 constraints()->oops_do(f); | |
| 1802 | |
| 1803 // Adjust resolution error table | |
| 1804 resolution_errors()->oops_do(f); | |
| 1805 } | |
| 1806 | |
| 1807 | |
| 1808 void SystemDictionary::preloaded_oops_do(OopClosure* f) { | |
|
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1809 for (int k = (int)FIRST_WKID; k < (int)WKID_LIMIT; k++) { |
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1810 f->do_oop((oop*) &_well_known_klasses[k]); |
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1811 } |
| 0 | 1812 |
| 1813 { | |
| 1814 for (int i = 0; i < T_VOID+1; i++) { | |
| 1815 if (_box_klasses[i] != NULL) { | |
| 1816 assert(i >= T_BOOLEAN, "checking"); | |
| 1817 f->do_oop((oop*) &_box_klasses[i]); | |
| 1818 } | |
| 1819 } | |
| 1820 } | |
| 1821 | |
| 1822 // The basic type mirrors would have already been processed in | |
| 1823 // Universe::oops_do(), via a call to shared_oops_do(), so should | |
| 1824 // not be processed again. | |
| 1825 | |
| 1826 f->do_oop((oop*) &_system_loader_lock_obj); | |
| 1827 FilteredFieldsMap::klasses_oops_do(f); | |
| 1828 } | |
| 1829 | |
| 1830 void SystemDictionary::lazily_loaded_oops_do(OopClosure* f) { | |
| 1831 f->do_oop((oop*) &_abstract_ownable_synchronizer_klass); | |
| 1832 } | |
| 1833 | |
| 1834 // Just the classes from defining class loaders | |
| 1835 // Don't iterate over placeholders | |
| 1836 void SystemDictionary::classes_do(void f(klassOop)) { | |
| 1837 dictionary()->classes_do(f); | |
| 1838 } | |
| 1839 | |
| 1840 // Added for initialize_itable_for_klass | |
| 1841 // Just the classes from defining class loaders | |
| 1842 // Don't iterate over placeholders | |
| 1843 void SystemDictionary::classes_do(void f(klassOop, TRAPS), TRAPS) { | |
| 1844 dictionary()->classes_do(f, CHECK); | |
| 1845 } | |
| 1846 | |
| 1847 // All classes, and their class loaders | |
| 1848 // Don't iterate over placeholders | |
| 1849 void SystemDictionary::classes_do(void f(klassOop, oop)) { | |
| 1850 dictionary()->classes_do(f); | |
| 1851 } | |
| 1852 | |
| 1853 // All classes, and their class loaders | |
| 1854 // (added for helpers that use HandleMarks and ResourceMarks) | |
| 1855 // Don't iterate over placeholders | |
| 1856 void SystemDictionary::classes_do(void f(klassOop, oop, TRAPS), TRAPS) { | |
| 1857 dictionary()->classes_do(f, CHECK); | |
| 1858 } | |
| 1859 | |
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1860 void SystemDictionary::placeholders_do(void f(Symbol*, oop)) { |
| 0 | 1861 placeholders()->entries_do(f); |
| 1862 } | |
| 1863 | |
| 1864 void SystemDictionary::methods_do(void f(methodOop)) { | |
| 1865 dictionary()->methods_do(f); | |
| 1903 | 1866 invoke_method_table()->methods_do(f); |
| 0 | 1867 } |
| 1868 | |
| 1869 // ---------------------------------------------------------------------------- | |
| 1870 // Lazily load klasses | |
| 1871 | |
| 1872 void SystemDictionary::load_abstract_ownable_synchronizer_klass(TRAPS) { | |
| 1873 assert(JDK_Version::is_gte_jdk16x_version(), "Must be JDK 1.6 or later"); | |
| 1874 | |
| 1875 // if multiple threads calling this function, only one thread will load | |
| 1876 // the class. The other threads will find the loaded version once the | |
| 1877 // class is loaded. | |
| 1878 klassOop aos = _abstract_ownable_synchronizer_klass; | |
| 1879 if (aos == NULL) { | |
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1880 klassOop k = resolve_or_fail(vmSymbols::java_util_concurrent_locks_AbstractOwnableSynchronizer(), true, CHECK); |
| 0 | 1881 // Force a fence to prevent any read before the write completes |
| 1882 OrderAccess::fence(); | |
| 1883 _abstract_ownable_synchronizer_klass = k; | |
| 1884 } | |
| 1885 } | |
| 1886 | |
| 1887 // ---------------------------------------------------------------------------- | |
| 1888 // Initialization | |
| 1889 | |
| 1890 void SystemDictionary::initialize(TRAPS) { | |
| 1891 // Allocate arrays | |
| 1892 assert(dictionary() == NULL, | |
| 1893 "SystemDictionary should only be initialized once"); | |
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1894 _sdgeneration = 0; |
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1895 _dictionary = new Dictionary(calculate_systemdictionary_size(PredictedLoadedClassCount)); |
| 1903 | 1896 _placeholders = new PlaceholderTable(_nof_buckets); |
| 0 | 1897 _number_of_modifications = 0; |
| 1903 | 1898 _loader_constraints = new LoaderConstraintTable(_loader_constraint_size); |
| 1899 _resolution_errors = new ResolutionErrorTable(_resolution_error_size); | |
| 1900 _invoke_method_table = new SymbolPropertyTable(_invoke_method_size); | |
| 0 | 1901 |
| 1902 // Allocate private object used as system class loader lock | |
| 1903 _system_loader_lock_obj = oopFactory::new_system_objArray(0, CHECK); | |
| 1904 // Initialize basic classes | |
| 1905 initialize_preloaded_classes(CHECK); | |
| 1906 } | |
| 1907 | |
|
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1908 // Compact table of directions on the initialization of klasses: |
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1909 static const short wk_init_info[] = { |
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1910 #define WK_KLASS_INIT_INFO(name, symbol, option) \ |
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1911 ( ((int)vmSymbols::VM_SYMBOL_ENUM_NAME(symbol) \ |
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1912 << SystemDictionary::CEIL_LG_OPTION_LIMIT) \ |
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1913 | (int)SystemDictionary::option ), |
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1914 WK_KLASSES_DO(WK_KLASS_INIT_INFO) |
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1915 #undef WK_KLASS_INIT_INFO |
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1916 0 |
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1917 }; |
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1918 |
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1919 bool SystemDictionary::initialize_wk_klass(WKID id, int init_opt, TRAPS) { |
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1920 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1921 int info = wk_init_info[id - FIRST_WKID]; |
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1922 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1923 Symbol* symbol = vmSymbols::symbol_at((vmSymbols::SID)sid); |
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1924 klassOop* klassp = &_well_known_klasses[id]; |
| 2460 | 1925 bool must_load = (init_opt < SystemDictionary::Opt); |
| 1926 bool try_load = true; | |
|
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1927 if (init_opt == SystemDictionary::Opt_Kernel) { |
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1928 #ifndef KERNEL |
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1929 try_load = false; |
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1930 #endif //KERNEL |
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1931 } |
| 2460 | 1932 if ((*klassp) == NULL && try_load) { |
|
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1933 if (must_load) { |
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1934 (*klassp) = resolve_or_fail(symbol, true, CHECK_0); // load required class |
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1935 } else { |
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1936 (*klassp) = resolve_or_null(symbol, CHECK_0); // load optional klass |
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1937 } |
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1938 } |
| 2460 | 1939 return ((*klassp) != NULL); |
|
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1940 } |
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1941 |
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1942 void SystemDictionary::initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS) { |
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1943 assert((int)start_id <= (int)limit_id, "IDs are out of order!"); |
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1944 for (int id = (int)start_id; id < (int)limit_id; id++) { |
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1945 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1946 int info = wk_init_info[id - FIRST_WKID]; |
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1947 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1948 int opt = (info & right_n_bits(CEIL_LG_OPTION_LIMIT)); |
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1949 |
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1950 initialize_wk_klass((WKID)id, opt, CHECK); |
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1951 |
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1952 // Update limits, so find_well_known_klass can be very fast: |
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1953 Symbol* s = vmSymbols::symbol_at((vmSymbols::SID)sid); |
|
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1954 if (wk_klass_name_limits[1] == NULL) { |
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1955 wk_klass_name_limits[0] = wk_klass_name_limits[1] = s; |
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1956 } else if (wk_klass_name_limits[1] < s) { |
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1957 wk_klass_name_limits[1] = s; |
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1958 } else if (wk_klass_name_limits[0] > s) { |
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1959 wk_klass_name_limits[0] = s; |
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1960 } |
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1961 } |
| 710 | 1962 |
| 1963 // move the starting value forward to the limit: | |
| 1964 start_id = limit_id; | |
|
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1965 } |
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1966 |
| 0 | 1967 |
| 1968 void SystemDictionary::initialize_preloaded_classes(TRAPS) { | |
| 1142 | 1969 assert(WK_KLASS(Object_klass) == NULL, "preloaded classes should only be initialized once"); |
| 0 | 1970 // Preload commonly used klasses |
|
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1971 WKID scan = FIRST_WKID; |
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1972 // first do Object, String, Class |
| 1142 | 1973 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Class_klass), scan, CHECK); |
|
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1974 |
| 3938 | 1975 java_lang_Class::compute_offsets(); |
|
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1976 |
| 0 | 1977 // Fixup mirrors for classes loaded before java.lang.Class. |
| 1978 // These calls iterate over the objects currently in the perm gen | |
| 1979 // so calling them at this point is matters (not before when there | |
| 1980 // are fewer objects and not later after there are more objects | |
| 1981 // in the perm gen. | |
| 1982 Universe::initialize_basic_type_mirrors(CHECK); | |
| 1983 Universe::fixup_mirrors(CHECK); | |
| 1984 | |
|
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1985 // do a bunch more: |
| 1142 | 1986 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Reference_klass), scan, CHECK); |
| 0 | 1987 |
| 1988 // Preload ref klasses and set reference types | |
| 1142 | 1989 instanceKlass::cast(WK_KLASS(Reference_klass))->set_reference_type(REF_OTHER); |
| 1990 instanceRefKlass::update_nonstatic_oop_maps(WK_KLASS(Reference_klass)); | |
| 0 | 1991 |
| 1142 | 1992 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(PhantomReference_klass), scan, CHECK); |
| 1993 instanceKlass::cast(WK_KLASS(SoftReference_klass))->set_reference_type(REF_SOFT); | |
| 1994 instanceKlass::cast(WK_KLASS(WeakReference_klass))->set_reference_type(REF_WEAK); | |
| 1995 instanceKlass::cast(WK_KLASS(FinalReference_klass))->set_reference_type(REF_FINAL); | |
| 1996 instanceKlass::cast(WK_KLASS(PhantomReference_klass))->set_reference_type(REF_PHANTOM); | |
|
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1997 |
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1998 // JSR 292 classes |
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1999 WKID jsr292_group_start = WK_KLASS_ENUM_NAME(MethodHandle_klass); |
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2000 WKID jsr292_group_end = WK_KLASS_ENUM_NAME(VolatileCallSite_klass); |
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2001 initialize_wk_klasses_until(jsr292_group_start, scan, CHECK); |
|
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2002 if (EnableInvokeDynamic) { |
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2003 initialize_wk_klasses_through(jsr292_group_end, scan, CHECK); |
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2004 } else { |
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2005 // Skip the JSR 292 classes, if not enabled. |
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2006 scan = WKID(jsr292_group_end + 1); |
|
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2007 } |
| 710 | 2008 |
|
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2009 initialize_wk_klasses_until(WKID_LIMIT, scan, CHECK); |
| 0 | 2010 |
| 1142 | 2011 _box_klasses[T_BOOLEAN] = WK_KLASS(Boolean_klass); |
| 2012 _box_klasses[T_CHAR] = WK_KLASS(Character_klass); | |
| 2013 _box_klasses[T_FLOAT] = WK_KLASS(Float_klass); | |
| 2014 _box_klasses[T_DOUBLE] = WK_KLASS(Double_klass); | |
| 2015 _box_klasses[T_BYTE] = WK_KLASS(Byte_klass); | |
| 2016 _box_klasses[T_SHORT] = WK_KLASS(Short_klass); | |
| 2017 _box_klasses[T_INT] = WK_KLASS(Integer_klass); | |
| 2018 _box_klasses[T_LONG] = WK_KLASS(Long_klass); | |
|
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2019 //_box_klasses[T_OBJECT] = WK_KLASS(object_klass); |
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2020 //_box_klasses[T_ARRAY] = WK_KLASS(object_klass); |
| 0 | 2021 |
| 2022 #ifdef KERNEL | |
| 3938 | 2023 if (DownloadManager_klass() == NULL) { |
| 0 | 2024 warning("Cannot find sun/jkernel/DownloadManager"); |
| 2025 } | |
| 2026 #endif // KERNEL | |
| 514 | 2027 |
| 0 | 2028 { // Compute whether we should use loadClass or loadClassInternal when loading classes. |
| 1142 | 2029 methodOop method = instanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::loadClassInternal_name(), vmSymbols::string_class_signature()); |
| 0 | 2030 _has_loadClassInternal = (method != NULL); |
| 2031 } | |
| 2032 { // Compute whether we should use checkPackageAccess or NOT | |
| 1142 | 2033 methodOop method = instanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::checkPackageAccess_name(), vmSymbols::class_protectiondomain_signature()); |
| 0 | 2034 _has_checkPackageAccess = (method != NULL); |
| 2035 } | |
| 2036 } | |
| 2037 | |
| 2038 // Tells if a given klass is a box (wrapper class, such as java.lang.Integer). | |
| 2039 // If so, returns the basic type it holds. If not, returns T_OBJECT. | |
| 2040 BasicType SystemDictionary::box_klass_type(klassOop k) { | |
| 2041 assert(k != NULL, ""); | |
| 2042 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { | |
| 2043 if (_box_klasses[i] == k) | |
| 2044 return (BasicType)i; | |
| 2045 } | |
| 2046 return T_OBJECT; | |
| 2047 } | |
| 2048 | |
|
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2049 KlassHandle SystemDictionaryHandles::box_klass(BasicType t) { |
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2050 if (t >= T_BOOLEAN && t <= T_VOID) |
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2051 return KlassHandle(&SystemDictionary::_box_klasses[t], true); |
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2052 else |
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2053 return KlassHandle(); |
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2054 } |
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2055 |
| 0 | 2056 // Constraints on class loaders. The details of the algorithm can be |
| 2057 // found in the OOPSLA'98 paper "Dynamic Class Loading in the Java | |
| 2058 // Virtual Machine" by Sheng Liang and Gilad Bracha. The basic idea is | |
| 2059 // that the system dictionary needs to maintain a set of contraints that | |
| 2060 // must be satisfied by all classes in the dictionary. | |
| 2061 // if defining is true, then LinkageError if already in systemDictionary | |
| 2062 // if initiating loader, then ok if instanceKlass matches existing entry | |
| 2063 | |
| 2064 void SystemDictionary::check_constraints(int d_index, unsigned int d_hash, | |
| 2065 instanceKlassHandle k, | |
| 2066 Handle class_loader, bool defining, | |
| 2067 TRAPS) { | |
| 2068 const char *linkage_error = NULL; | |
| 2069 { | |
|
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2070 Symbol* name = k->name(); |
| 0 | 2071 MutexLocker mu(SystemDictionary_lock, THREAD); |
| 2072 | |
| 2073 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 2074 if (check != (klassOop)NULL) { | |
| 2075 // if different instanceKlass - duplicate class definition, | |
| 2076 // else - ok, class loaded by a different thread in parallel, | |
| 2077 // we should only have found it if it was done loading and ok to use | |
| 2078 // system dictionary only holds instance classes, placeholders | |
| 2079 // also holds array classes | |
| 2080 | |
| 2081 assert(check->klass_part()->oop_is_instance(), "noninstance in systemdictionary"); | |
| 2082 if ((defining == true) || (k() != check)) { | |
| 2083 linkage_error = "loader (instance of %s): attempted duplicate class " | |
| 2084 "definition for name: \"%s\""; | |
| 2085 } else { | |
| 2086 return; | |
| 2087 } | |
| 2088 } | |
| 2089 | |
| 2090 #ifdef ASSERT | |
|
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2091 Symbol* ph_check = find_placeholder(name, class_loader); |
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2092 assert(ph_check == NULL || ph_check == name, "invalid symbol"); |
| 0 | 2093 #endif |
| 2094 | |
| 2095 if (linkage_error == NULL) { | |
| 2096 if (constraints()->check_or_update(k, class_loader, name) == false) { | |
| 2097 linkage_error = "loader constraint violation: loader (instance of %s)" | |
| 2098 " previously initiated loading for a different type with name \"%s\""; | |
| 2099 } | |
| 2100 } | |
| 2101 } | |
| 2102 | |
| 2103 // Throw error now if needed (cannot throw while holding | |
| 2104 // SystemDictionary_lock because of rank ordering) | |
| 2105 | |
| 2106 if (linkage_error) { | |
| 2107 ResourceMark rm(THREAD); | |
| 2108 const char* class_loader_name = loader_name(class_loader()); | |
| 2109 char* type_name = k->name()->as_C_string(); | |
| 2110 size_t buflen = strlen(linkage_error) + strlen(class_loader_name) + | |
| 2111 strlen(type_name); | |
| 2112 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
| 2113 jio_snprintf(buf, buflen, linkage_error, class_loader_name, type_name); | |
| 2114 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); | |
| 2115 } | |
| 2116 } | |
| 2117 | |
| 2118 | |
| 2119 // Update system dictionary - done after check_constraint and add_to_hierachy | |
| 2120 // have been called. | |
| 2121 void SystemDictionary::update_dictionary(int d_index, unsigned int d_hash, | |
| 2122 int p_index, unsigned int p_hash, | |
| 2123 instanceKlassHandle k, | |
| 2124 Handle class_loader, | |
| 2125 TRAPS) { | |
| 2126 // Compile_lock prevents systemDictionary updates during compilations | |
| 2127 assert_locked_or_safepoint(Compile_lock); | |
|
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2128 Symbol* name = k->name(); |
| 0 | 2129 |
| 2130 { | |
| 2131 MutexLocker mu1(SystemDictionary_lock, THREAD); | |
| 2132 | |
| 2133 // See whether biased locking is enabled and if so set it for this | |
| 2134 // klass. | |
| 2135 // Note that this must be done past the last potential blocking | |
| 2136 // point / safepoint. We enable biased locking lazily using a | |
| 2137 // VM_Operation to iterate the SystemDictionary and installing the | |
| 2138 // biasable mark word into each instanceKlass's prototype header. | |
| 2139 // To avoid race conditions where we accidentally miss enabling the | |
| 2140 // optimization for one class in the process of being added to the | |
| 2141 // dictionary, we must not safepoint after the test of | |
| 2142 // BiasedLocking::enabled(). | |
| 2143 if (UseBiasedLocking && BiasedLocking::enabled()) { | |
| 2144 // Set biased locking bit for all loaded classes; it will be | |
| 2145 // cleared if revocation occurs too often for this type | |
| 2146 // NOTE that we must only do this when the class is initally | |
| 2147 // defined, not each time it is referenced from a new class loader | |
| 2148 if (k->class_loader() == class_loader()) { | |
| 2149 k->set_prototype_header(markOopDesc::biased_locking_prototype()); | |
| 2150 } | |
| 2151 } | |
| 2152 | |
|
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2153 // Assign a classid if one has not already been assigned. The |
|
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2154 // counter does not need to be atomically incremented since this |
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2155 // is only done while holding the SystemDictionary_lock. |
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2156 // All loaded classes get a unique ID. |
|
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|
2157 TRACE_INIT_ID(k); |
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|
2158 |
| 0 | 2159 // Check for a placeholder. If there, remove it and make a |
| 2160 // new system dictionary entry. | |
| 2161 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
| 2162 klassOop sd_check = find_class(d_index, d_hash, name, class_loader); | |
| 2163 if (sd_check == NULL) { | |
| 2164 dictionary()->add_klass(name, class_loader, k); | |
| 2165 notice_modification(); | |
| 2166 } | |
| 2167 #ifdef ASSERT | |
| 2168 sd_check = find_class(d_index, d_hash, name, class_loader); | |
| 2169 assert (sd_check != NULL, "should have entry in system dictionary"); | |
| 2170 // Changed to allow PH to remain to complete class circularity checking | |
| 2171 // while only one thread can define a class at one time, multiple | |
| 2172 // classes can resolve the superclass for a class at one time, | |
| 2173 // and the placeholder is used to track that | |
|
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2174 // Symbol* ph_check = find_placeholder(name, class_loader); |
| 0 | 2175 // assert (ph_check == NULL, "should not have a placeholder entry"); |
| 2176 #endif | |
| 2177 SystemDictionary_lock->notify_all(); | |
| 2178 } | |
| 2179 } | |
| 2180 | |
| 2181 | |
|
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2182 // Try to find a class name using the loader constraints. The |
|
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2183 // loader constraints might know about a class that isn't fully loaded |
|
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2184 // yet and these will be ignored. |
| 0 | 2185 klassOop SystemDictionary::find_constrained_instance_or_array_klass( |
|
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2186 Symbol* class_name, Handle class_loader, TRAPS) { |
| 0 | 2187 |
| 2188 // First see if it has been loaded directly. | |
| 2189 // Force the protection domain to be null. (This removes protection checks.) | |
| 2190 Handle no_protection_domain; | |
| 2191 klassOop klass = find_instance_or_array_klass(class_name, class_loader, | |
| 2192 no_protection_domain, CHECK_NULL); | |
| 2193 if (klass != NULL) | |
| 2194 return klass; | |
| 2195 | |
| 2196 // Now look to see if it has been loaded elsewhere, and is subject to | |
| 2197 // a loader constraint that would require this loader to return the | |
| 2198 // klass that is already loaded. | |
|
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2199 if (FieldType::is_array(class_name)) { |
| 1336 | 2200 // For array classes, their klassOops are not kept in the |
| 2201 // constraint table. The element klassOops are. | |
|
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2202 FieldArrayInfo fd; |
|
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|
2203 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
| 0 | 2204 if (t != T_OBJECT) { |
| 2205 klass = Universe::typeArrayKlassObj(t); | |
| 2206 } else { | |
| 2207 MutexLocker mu(SystemDictionary_lock, THREAD); | |
|
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2208 klass = constraints()->find_constrained_klass(fd.object_key(), class_loader); |
| 0 | 2209 } |
| 1336 | 2210 // If element class already loaded, allocate array klass |
| 0 | 2211 if (klass != NULL) { |
|
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2212 klass = Klass::cast(klass)->array_klass_or_null(fd.dimension()); |
| 0 | 2213 } |
| 2214 } else { | |
| 2215 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 2216 // Non-array classes are easy: simply check the constraint table. | |
| 2217 klass = constraints()->find_constrained_klass(class_name, class_loader); | |
| 2218 } | |
| 2219 | |
| 2220 return klass; | |
| 2221 } | |
| 2222 | |
| 2223 | |
|
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2224 bool SystemDictionary::add_loader_constraint(Symbol* class_name, |
| 0 | 2225 Handle class_loader1, |
| 2226 Handle class_loader2, | |
| 2227 Thread* THREAD) { | |
|
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2228 Symbol* constraint_name = NULL; |
|
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2229 if (!FieldType::is_array(class_name)) { |
| 1336 | 2230 constraint_name = class_name; |
| 2231 } else { | |
| 2232 // For array classes, their klassOops are not kept in the | |
| 2233 // constraint table. The element classes are. | |
|
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2234 FieldArrayInfo fd; |
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2235 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(false)); |
| 1336 | 2236 // primitive types always pass |
| 2237 if (t != T_OBJECT) { | |
| 2238 return true; | |
| 2239 } else { | |
|
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2240 constraint_name = fd.object_key(); |
| 1336 | 2241 } |
| 2242 } | |
| 2243 unsigned int d_hash1 = dictionary()->compute_hash(constraint_name, class_loader1); | |
| 0 | 2244 int d_index1 = dictionary()->hash_to_index(d_hash1); |
| 2245 | |
| 1336 | 2246 unsigned int d_hash2 = dictionary()->compute_hash(constraint_name, class_loader2); |
| 0 | 2247 int d_index2 = dictionary()->hash_to_index(d_hash2); |
| 2248 { | |
| 1336 | 2249 MutexLocker mu_s(SystemDictionary_lock, THREAD); |
| 0 | 2250 |
| 1336 | 2251 // Better never do a GC while we're holding these oops |
| 2252 No_Safepoint_Verifier nosafepoint; | |
| 0 | 2253 |
| 1336 | 2254 klassOop klass1 = find_class(d_index1, d_hash1, constraint_name, class_loader1); |
| 2255 klassOop klass2 = find_class(d_index2, d_hash2, constraint_name, class_loader2); | |
| 2256 return constraints()->add_entry(constraint_name, klass1, class_loader1, | |
| 2257 klass2, class_loader2); | |
| 0 | 2258 } |
| 2259 } | |
| 2260 | |
| 2261 // Add entry to resolution error table to record the error when the first | |
| 2262 // attempt to resolve a reference to a class has failed. | |
|
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2263 void SystemDictionary::add_resolution_error(constantPoolHandle pool, int which, Symbol* error) { |
| 0 | 2264 unsigned int hash = resolution_errors()->compute_hash(pool, which); |
| 2265 int index = resolution_errors()->hash_to_index(hash); | |
| 2266 { | |
| 2267 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
| 2268 resolution_errors()->add_entry(index, hash, pool, which, error); | |
| 2269 } | |
| 2270 } | |
| 2271 | |
| 2272 // Lookup resolution error table. Returns error if found, otherwise NULL. | |
|
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2273 Symbol* SystemDictionary::find_resolution_error(constantPoolHandle pool, int which) { |
| 0 | 2274 unsigned int hash = resolution_errors()->compute_hash(pool, which); |
| 2275 int index = resolution_errors()->hash_to_index(hash); | |
| 2276 { | |
| 2277 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
| 2278 ResolutionErrorEntry* entry = resolution_errors()->find_entry(index, hash, pool, which); | |
|
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2279 return (entry != NULL) ? entry->error() : (Symbol*)NULL; |
| 0 | 2280 } |
| 2281 } | |
| 2282 | |
| 2283 | |
|
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2284 // Signature constraints ensure that callers and callees agree about |
|
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2285 // the meaning of type names in their signatures. This routine is the |
|
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2286 // intake for constraints. It collects them from several places: |
|
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|
2287 // |
|
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|
2288 // * LinkResolver::resolve_method (if check_access is true) requires |
|
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|
2289 // that the resolving class (the caller) and the defining class of |
|
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|
2290 // the resolved method (the callee) agree on each type in the |
|
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|
2291 // method's signature. |
|
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|
2292 // |
|
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|
2293 // * LinkResolver::resolve_interface_method performs exactly the same |
|
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|
2294 // checks. |
|
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|
2295 // |
|
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|
2296 // * LinkResolver::resolve_field requires that the constant pool |
|
c89f86385056
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|
2297 // attempting to link to a field agree with the field's defining |
|
c89f86385056
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|
2298 // class about the type of the field signature. |
|
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|
2299 // |
|
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|
2300 // * klassVtable::initialize_vtable requires that, when a class |
|
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579
diff
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|
2301 // overrides a vtable entry allocated by a superclass, that the |
|
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|
2302 // overriding method (i.e., the callee) agree with the superclass |
|
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|
2303 // on each type in the method's signature. |
|
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|
2304 // |
|
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|
2305 // * klassItable::initialize_itable requires that, when a class fills |
|
c89f86385056
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jrose
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diff
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|
2306 // in its itables, for each non-abstract method installed in an |
|
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jrose
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diff
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|
2307 // itable, the method (i.e., the callee) agree with the interface |
|
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|
2308 // on each type in the method's signature. |
|
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|
2309 // |
|
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diff
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|
2310 // All those methods have a boolean (check_access, checkconstraints) |
|
c89f86385056
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jrose
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579
diff
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|
2311 // which turns off the checks. This is used from specialized contexts |
|
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
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579
diff
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|
2312 // such as bootstrapping, dumping, and debugging. |
|
c89f86385056
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579
diff
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|
2313 // |
|
c89f86385056
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diff
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|
2314 // No direct constraint is placed between the class and its |
|
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
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579
diff
changeset
|
2315 // supertypes. Constraints are only placed along linked relations |
|
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
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579
diff
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|
2316 // between callers and callees. When a method overrides or implements |
|
c89f86385056
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jrose
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579
diff
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|
2317 // an abstract method in a supertype (superclass or interface), the |
|
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
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579
diff
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|
2318 // constraints are placed as if the supertype were the caller to the |
|
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
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579
diff
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|
2319 // overriding method. (This works well, since callers to the |
|
c89f86385056
6814659: separable cleanups and subroutines for 6655638
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579
diff
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|
2320 // supertype have already established agreement between themselves and |
|
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
579
diff
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|
2321 // the supertype.) As a result of all this, a class can disagree with |
|
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
579
diff
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|
2322 // its supertype about the meaning of a type name, as long as that |
|
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
579
diff
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|
2323 // class neither calls a relevant method of the supertype, nor is |
|
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
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579
diff
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|
2324 // called (perhaps via an override) from the supertype. |
|
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
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diff
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|
2325 // |
|
c89f86385056
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diff
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|
2326 // |
|
c89f86385056
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diff
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|
2327 // SystemDictionary::check_signature_loaders(sig, l1, l2) |
|
c89f86385056
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parents:
579
diff
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|
2328 // |
| 0 | 2329 // Make sure all class components (including arrays) in the given |
| 2330 // signature will be resolved to the same class in both loaders. | |
| 2331 // Returns the name of the type that failed a loader constraint check, or | |
| 2332 // NULL if no constraint failed. The returned C string needs cleaning up | |
|
665
c89f86385056
6814659: separable cleanups and subroutines for 6655638
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579
diff
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|
2333 // with a ResourceMark in the caller. No exception except OOME is thrown. |
| 1336 | 2334 // Arrays are not added to the loader constraint table, their elements are. |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2335 char* SystemDictionary::check_signature_loaders(Symbol* signature, |
| 0 | 2336 Handle loader1, Handle loader2, |
| 2337 bool is_method, TRAPS) { | |
| 2338 // Nothing to do if loaders are the same. | |
| 2339 if (loader1() == loader2()) { | |
| 2340 return NULL; | |
| 2341 } | |
| 2342 | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2001
diff
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|
2343 ResourceMark rm(THREAD); |
| 0 | 2344 SignatureStream sig_strm(signature, is_method); |
| 2345 while (!sig_strm.is_done()) { | |
| 2346 if (sig_strm.is_object()) { | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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diff
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|
2347 Symbol* s = sig_strm.as_symbol(CHECK_NULL); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2001
diff
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|
2348 Symbol* sig = s; |
| 0 | 2349 if (!add_loader_constraint(sig, loader1, loader2, THREAD)) { |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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diff
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|
2350 return sig->as_C_string(); |
| 0 | 2351 } |
| 2352 } | |
| 2353 sig_strm.next(); | |
| 2354 } | |
| 2355 return NULL; | |
| 2356 } | |
| 2357 | |
| 2358 | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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diff
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|
2359 methodOop SystemDictionary::find_method_handle_invoke(Symbol* name, |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2360 Symbol* signature, |
|
1508
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jrose
parents:
1507
diff
changeset
|
2361 KlassHandle accessing_klass, |
| 710 | 2362 TRAPS) { |
|
2416
38fea01eb669
6817525: turn on method handle functionality by default for JSR 292
twisti
parents:
2357
diff
changeset
|
2363 if (!EnableInvokeDynamic) return NULL; |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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diff
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|
2364 vmSymbols::SID name_id = vmSymbols::find_sid(name); |
|
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
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1339
diff
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|
2365 assert(name_id != vmSymbols::NO_SID, "must be a known name"); |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
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1339
diff
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|
2366 unsigned int hash = invoke_method_table()->compute_hash(signature, name_id); |
| 710 | 2367 int index = invoke_method_table()->hash_to_index(hash); |
|
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
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|
2368 SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, name_id); |
|
1508
2ffde6cfe049
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1507
diff
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|
2369 methodHandle non_cached_result; |
| 710 | 2370 if (spe == NULL || spe->property_oop() == NULL) { |
|
1508
2ffde6cfe049
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parents:
1507
diff
changeset
|
2371 spe = NULL; |
| 710 | 2372 // Must create lots of stuff here, but outside of the SystemDictionary lock. |
|
1410
b30a2cd5e3a2
Added methods to c1x_VMExits.cpp
Thomas Wuerthinger <thomas.wuerthinger@gmail.com>
parents:
1407
diff
changeset
|
2373 // (tw) May we do this? |
|
b30a2cd5e3a2
Added methods to c1x_VMExits.cpp
Thomas Wuerthinger <thomas.wuerthinger@gmail.com>
parents:
1407
diff
changeset
|
2374 //if (THREAD->is_Compiler_thread()) |
|
b30a2cd5e3a2
Added methods to c1x_VMExits.cpp
Thomas Wuerthinger <thomas.wuerthinger@gmail.com>
parents:
1407
diff
changeset
|
2375 // return NULL; // do not attempt from within compiler |
| 2460 | 2376 bool for_invokeGeneric = (name_id != vmSymbols::VM_SYMBOL_ENUM_NAME(invokeExact_name)); |
|
1508
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
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1507
diff
changeset
|
2377 bool found_on_bcp = false; |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2001
diff
changeset
|
2378 Handle mt = find_method_handle_type(signature, accessing_klass, |
|
1793
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents:
1660
diff
changeset
|
2379 for_invokeGeneric, |
|
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents:
1660
diff
changeset
|
2380 found_on_bcp, CHECK_NULL); |
| 710 | 2381 KlassHandle mh_klass = SystemDictionaryHandles::MethodHandle_klass(); |
|
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2382 methodHandle m = methodOopDesc::make_invoke_method(mh_klass, name, signature, |
| 710 | 2383 mt, CHECK_NULL); |
| 2384 // Now grab the lock. We might have to throw away the new method, | |
| 2385 // if a racing thread has managed to install one at the same time. | |
|
1508
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2386 if (found_on_bcp) { |
| 710 | 2387 MutexLocker ml(SystemDictionary_lock, Thread::current()); |
|
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2388 spe = invoke_method_table()->find_entry(index, hash, signature, name_id); |
| 710 | 2389 if (spe == NULL) |
|
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2390 spe = invoke_method_table()->add_entry(index, hash, signature, name_id); |
|
3363
167b70ff3abc
6939861: JVM should handle more conversion operations
never
parents:
3245
diff
changeset
|
2391 if (spe->property_oop() == NULL) { |
| 710 | 2392 spe->set_property_oop(m()); |
|
3363
167b70ff3abc
6939861: JVM should handle more conversion operations
never
parents:
3245
diff
changeset
|
2393 // Link m to his method type, if it is suitably generic. |
|
167b70ff3abc
6939861: JVM should handle more conversion operations
never
parents:
3245
diff
changeset
|
2394 oop mtform = java_lang_invoke_MethodType::form(mt()); |
|
167b70ff3abc
6939861: JVM should handle more conversion operations
never
parents:
3245
diff
changeset
|
2395 if (mtform != NULL && mt() == java_lang_invoke_MethodTypeForm::erasedType(mtform) |
|
3461
81d815b05abb
7056328: JSR 292 invocation sometimes fails in adapters for types not on boot class path
jrose
parents:
3363
diff
changeset
|
2396 // vmlayout must be an invokeExact: |
|
81d815b05abb
7056328: JSR 292 invocation sometimes fails in adapters for types not on boot class path
jrose
parents:
3363
diff
changeset
|
2397 && name_id == vmSymbols::VM_SYMBOL_ENUM_NAME(invokeExact_name) |
|
3363
167b70ff3abc
6939861: JVM should handle more conversion operations
never
parents:
3245
diff
changeset
|
2398 && java_lang_invoke_MethodTypeForm::vmlayout_offset_in_bytes() > 0) { |
|
167b70ff3abc
6939861: JVM should handle more conversion operations
never
parents:
3245
diff
changeset
|
2399 java_lang_invoke_MethodTypeForm::init_vmlayout(mtform, m()); |
|
167b70ff3abc
6939861: JVM should handle more conversion operations
never
parents:
3245
diff
changeset
|
2400 } |
|
167b70ff3abc
6939861: JVM should handle more conversion operations
never
parents:
3245
diff
changeset
|
2401 } |
|
1508
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2402 } else { |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2403 non_cached_result = m; |
| 710 | 2404 } |
| 2405 } | |
|
1508
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2406 if (spe != NULL && spe->property_oop() != NULL) { |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2407 assert(spe->property_oop()->is_method(), ""); |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2408 return (methodOop) spe->property_oop(); |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2409 } else { |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2410 return non_cached_result(); |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2411 } |
| 710 | 2412 } |
| 2413 | |
|
2357
8033953d67ff
7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents:
2356
diff
changeset
|
2414 // Ask Java code to find or construct a java.lang.invoke.MethodType for the given |
| 710 | 2415 // signature, as interpreted relative to the given class loader. |
| 2416 // Because of class loader constraints, all method handle usage must be | |
| 2417 // consistent with this loader. | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2418 Handle SystemDictionary::find_method_handle_type(Symbol* signature, |
|
1508
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2419 KlassHandle accessing_klass, |
|
1793
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents:
1660
diff
changeset
|
2420 bool for_invokeGeneric, |
|
1508
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2421 bool& return_bcp_flag, |
|
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2422 TRAPS) { |
|
1508
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2423 Handle class_loader, protection_domain; |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2424 bool is_on_bcp = true; // keep this true as long as we can materialize from the boot classloader |
| 710 | 2425 Handle empty; |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2426 int npts = ArgumentCount(signature).size(); |
| 1142 | 2427 objArrayHandle pts = oopFactory::new_objArray(SystemDictionary::Class_klass(), npts, CHECK_(empty)); |
| 710 | 2428 int arg = 0; |
| 2429 Handle rt; // the return type from the signature | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2430 ResourceMark rm(THREAD); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2431 for (SignatureStream ss(signature); !ss.is_done(); ss.next()) { |
|
1508
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2432 oop mirror = NULL; |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2433 if (is_on_bcp) { |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2434 mirror = ss.as_java_mirror(class_loader, protection_domain, |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2435 SignatureStream::ReturnNull, CHECK_(empty)); |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2436 if (mirror == NULL) { |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2437 // fall back from BCP to accessing_klass |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2438 if (accessing_klass.not_null()) { |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2439 class_loader = Handle(THREAD, instanceKlass::cast(accessing_klass())->class_loader()); |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
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1507
diff
changeset
|
2440 protection_domain = Handle(THREAD, instanceKlass::cast(accessing_klass())->protection_domain()); |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2441 } |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2442 is_on_bcp = false; |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2443 } |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2444 } |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2445 if (!is_on_bcp) { |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2446 // Resolve, throwing a real error if it doesn't work. |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
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1507
diff
changeset
|
2447 mirror = ss.as_java_mirror(class_loader, protection_domain, |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2448 SignatureStream::NCDFError, CHECK_(empty)); |
| 710 | 2449 } |
| 2450 if (ss.at_return_type()) | |
| 2451 rt = Handle(THREAD, mirror); | |
| 2452 else | |
| 2453 pts->obj_at_put(arg++, mirror); | |
|
1508
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2454 // Check accessibility. |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2455 if (ss.is_object() && accessing_klass.not_null()) { |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2456 klassOop sel_klass = java_lang_Class::as_klassOop(mirror); |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2457 // Emulate constantPoolOopDesc::verify_constant_pool_resolve. |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2458 if (Klass::cast(sel_klass)->oop_is_objArray()) |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2459 sel_klass = objArrayKlass::cast(sel_klass)->bottom_klass(); |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2460 if (Klass::cast(sel_klass)->oop_is_instance()) { |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2461 KlassHandle sel_kh(THREAD, sel_klass); |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2462 LinkResolver::check_klass_accessability(accessing_klass, sel_kh, CHECK_(empty)); |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2463 } |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2464 } |
| 710 | 2465 } |
| 2466 assert(arg == npts, ""); | |
| 2467 | |
|
2357
8033953d67ff
7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents:
2356
diff
changeset
|
2468 // call java.lang.invoke.MethodHandleNatives::findMethodType(Class rt, Class[] pts) -> MethodType |
| 710 | 2469 JavaCallArguments args(Handle(THREAD, rt())); |
| 2470 args.push_oop(pts()); | |
| 2471 JavaValue result(T_OBJECT); | |
| 2472 JavaCalls::call_static(&result, | |
|
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2473 SystemDictionary::MethodHandleNatives_klass(), |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2474 vmSymbols::findMethodHandleType_name(), |
| 2460 | 2475 vmSymbols::findMethodHandleType_signature(), |
| 710 | 2476 &args, CHECK_(empty)); |
|
1793
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents:
1660
diff
changeset
|
2477 Handle method_type(THREAD, (oop) result.get_jobject()); |
|
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents:
1660
diff
changeset
|
2478 |
|
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents:
1660
diff
changeset
|
2479 if (for_invokeGeneric) { |
|
2357
8033953d67ff
7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents:
2356
diff
changeset
|
2480 // call java.lang.invoke.MethodHandleNatives::notifyGenericMethodType(MethodType) -> void |
|
1793
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents:
1660
diff
changeset
|
2481 JavaCallArguments args(Handle(THREAD, method_type())); |
|
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents:
1660
diff
changeset
|
2482 JavaValue no_result(T_VOID); |
|
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents:
1660
diff
changeset
|
2483 JavaCalls::call_static(&no_result, |
|
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents:
1660
diff
changeset
|
2484 SystemDictionary::MethodHandleNatives_klass(), |
|
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents:
1660
diff
changeset
|
2485 vmSymbols::notifyGenericMethodType_name(), |
| 2460 | 2486 vmSymbols::notifyGenericMethodType_signature(), |
|
1793
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents:
1660
diff
changeset
|
2487 &args, THREAD); |
|
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents:
1660
diff
changeset
|
2488 if (HAS_PENDING_EXCEPTION) { |
|
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents:
1660
diff
changeset
|
2489 // If the notification fails, just kill it. |
|
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents:
1660
diff
changeset
|
2490 CLEAR_PENDING_EXCEPTION; |
|
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents:
1660
diff
changeset
|
2491 } |
|
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents:
1660
diff
changeset
|
2492 } |
|
1508
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2493 |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2494 // 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
parents:
1507
diff
changeset
|
2495 return_bcp_flag = is_on_bcp; |
|
1793
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents:
1660
diff
changeset
|
2496 return method_type; |
| 710 | 2497 } |
| 2498 | |
| 1602 | 2499 // Ask Java code to find or construct a method handle constant. |
| 2500 Handle SystemDictionary::link_method_handle_constant(KlassHandle caller, | |
| 2501 int ref_kind, //e.g., JVM_REF_invokeVirtual | |
| 2502 KlassHandle callee, | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2503 Symbol* name_sym, |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2504 Symbol* signature, |
| 1602 | 2505 TRAPS) { |
| 2506 Handle empty; | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2507 Handle name = java_lang_String::create_from_symbol(name_sym, CHECK_(empty)); |
| 1602 | 2508 Handle type; |
| 2509 if (signature->utf8_length() > 0 && signature->byte_at(0) == '(') { | |
| 2510 bool ignore_is_on_bcp = false; | |
|
1793
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
jrose
parents:
1660
diff
changeset
|
2511 type = find_method_handle_type(signature, caller, false, ignore_is_on_bcp, CHECK_(empty)); |
| 1602 | 2512 } else { |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2513 ResourceMark rm(THREAD); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2514 SignatureStream ss(signature, false); |
| 1602 | 2515 if (!ss.is_done()) { |
| 2516 oop mirror = ss.as_java_mirror(caller->class_loader(), caller->protection_domain(), | |
| 2517 SignatureStream::NCDFError, CHECK_(empty)); | |
| 2518 type = Handle(THREAD, mirror); | |
| 2519 ss.next(); | |
| 2520 if (!ss.is_done()) type = Handle(); // error! | |
| 2521 } | |
| 2522 } | |
| 2523 if (type.is_null()) { | |
| 2524 THROW_MSG_(vmSymbols::java_lang_LinkageError(), "bad signature", empty); | |
| 2525 } | |
| 2526 | |
|
2357
8033953d67ff
7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents:
2356
diff
changeset
|
2527 // call java.lang.invoke.MethodHandleNatives::linkMethodHandleConstant(Class caller, int refKind, Class callee, String name, Object type) -> MethodHandle |
| 1602 | 2528 JavaCallArguments args; |
| 2529 args.push_oop(caller->java_mirror()); // the referring class | |
| 2530 args.push_int(ref_kind); | |
| 2531 args.push_oop(callee->java_mirror()); // the target class | |
| 2532 args.push_oop(name()); | |
| 2533 args.push_oop(type()); | |
| 2534 JavaValue result(T_OBJECT); | |
| 2535 JavaCalls::call_static(&result, | |
| 2536 SystemDictionary::MethodHandleNatives_klass(), | |
| 2537 vmSymbols::linkMethodHandleConstant_name(), | |
| 2460 | 2538 vmSymbols::linkMethodHandleConstant_signature(), |
| 1602 | 2539 &args, CHECK_(empty)); |
| 2540 return Handle(THREAD, (oop) result.get_jobject()); | |
| 2541 } | |
| 710 | 2542 |
|
2357
8033953d67ff
7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents:
2356
diff
changeset
|
2543 // Ask Java code to find or construct a java.lang.invoke.CallSite for the given |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2544 // 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
changeset
|
2545 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
|
2546 Symbol* name, |
|
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2547 methodHandle signature_invoker, |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2548 Handle info, |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2549 methodHandle caller_method, |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2550 int caller_bci, |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2551 TRAPS) { |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2552 Handle empty; |
|
1660
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2553 guarantee(bootstrap_method.not_null() && |
|
2357
8033953d67ff
7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents:
2356
diff
changeset
|
2554 java_lang_invoke_MethodHandle::is_instance(bootstrap_method()), |
|
1660
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2555 "caller must supply a valid BSM"); |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2556 |
|
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2557 Handle caller_mname = MethodHandles::new_MemberName(CHECK_(empty)); |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2558 MethodHandles::init_MemberName(caller_mname(), caller_method()); |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2559 |
|
2357
8033953d67ff
7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents:
2356
diff
changeset
|
2560 // call java.lang.invoke.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
|
2561 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
|
2562 JavaCallArguments args(Handle(THREAD, bootstrap_method())); |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2563 args.push_oop(name_str_oop); |
|
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2564 args.push_oop(signature_invoker->method_handle_type()); |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2565 args.push_oop(info()); |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2566 args.push_oop(caller_mname()); |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2567 args.push_int(caller_bci); |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2568 JavaValue result(T_OBJECT); |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2569 JavaCalls::call_static(&result, |
|
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2570 SystemDictionary::MethodHandleNatives_klass(), |
|
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1339
diff
changeset
|
2571 vmSymbols::makeDynamicCallSite_name(), |
| 2460 | 2572 vmSymbols::makeDynamicCallSite_signature(), |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2573 &args, CHECK_(empty)); |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2574 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
|
2575 assert(call_site_oop->is_oop() |
|
2357
8033953d67ff
7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents:
2356
diff
changeset
|
2576 /*&& java_lang_invoke_CallSite::is_instance(call_site_oop)*/, "must be sane"); |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2577 if (TraceMethodHandles) { |
|
1059
389049f3f393
6858164: invokedynamic code needs some cleanup (post-6655638)
jrose
parents:
1039
diff
changeset
|
2578 #ifndef PRODUCT |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2579 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
|
2580 call_site_oop->print(); |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2581 tty->cr(); |
|
1059
389049f3f393
6858164: invokedynamic code needs some cleanup (post-6655638)
jrose
parents:
1039
diff
changeset
|
2582 #endif //PRODUCT |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2583 } |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2584 return call_site_oop; |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2585 } |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2586 |
|
1660
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2587 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
|
2588 int cache_index, |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2589 Handle& argument_info_result, |
|
3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
jrose
parents:
1903
diff
changeset
|
2590 TRAPS) { |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2591 Handle empty; |
|
1660
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2592 |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2593 constantPoolHandle pool; |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2594 { |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2595 klassOop caller = caller_method->method_holder(); |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2596 if (!Klass::cast(caller)->oop_is_instance()) return empty; |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2597 pool = constantPoolHandle(THREAD, instanceKlass::cast(caller)->constants()); |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2598 } |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2599 |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2600 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
|
2601 constantTag tag = pool->tag_at(constant_pool_index); |
|
083fde3b838e
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|
2602 |
|
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|
2603 if (tag.is_invoke_dynamic()) { |
|
1913
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|
2604 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments |
|
1660
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2605 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry. |
|
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2606 int bsm_index = pool->invoke_dynamic_bootstrap_method_ref_index_at(constant_pool_index); |
|
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2607 if (bsm_index != 0) { |
|
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2608 int bsm_index_in_cache = pool->cache()->entry_at(cache_index)->bootstrap_method_index_in_cache(); |
|
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2609 DEBUG_ONLY(int bsm_index_2 = pool->cache()->entry_at(bsm_index_in_cache)->constant_pool_index()); |
|
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2610 assert(bsm_index == bsm_index_2, "BSM constant lifted to cache"); |
|
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2611 if (TraceMethodHandles) { |
|
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|
2612 tty->print_cr("resolving bootstrap method for "PTR_FORMAT" at %d at cache[%d]CP[%d]...", |
|
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2613 (intptr_t) caller_method(), caller_bci, cache_index, constant_pool_index); |
|
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2614 } |
|
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2615 oop bsm_oop = pool->resolve_cached_constant_at(bsm_index_in_cache, CHECK_(empty)); |
|
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2616 if (TraceMethodHandles) { |
|
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2617 tty->print_cr("bootstrap method for "PTR_FORMAT" at %d retrieved as "PTR_FORMAT":", |
|
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2618 (intptr_t) caller_method(), caller_bci, (intptr_t) bsm_oop); |
|
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|
2619 } |
|
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|
2620 assert(bsm_oop->is_oop(), "must be sane"); |
|
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2621 // caller must verify that it is of type MethodHandle |
|
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|
2622 Handle bsm(THREAD, bsm_oop); |
|
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|
2623 bsm_oop = NULL; // safety |
|
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|
2624 |
|
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|
2625 // Extract the optional static arguments. |
|
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|
2626 Handle argument_info; // either null, or one arg, or Object[]{arg...} |
|
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|
2627 int argc = pool->invoke_dynamic_argument_count_at(constant_pool_index); |
|
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|
2628 if (TraceInvokeDynamic) { |
|
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|
2629 tty->print_cr("find_bootstrap_method: [%d/%d] CONSTANT_InvokeDynamic: %d[%d]", |
|
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|
2630 constant_pool_index, cache_index, bsm_index, argc); |
|
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|
2631 } |
|
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|
2632 if (argc > 0) { |
|
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|
2633 objArrayHandle arg_array; |
|
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|
2634 if (argc > 1) { |
|
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|
2635 objArrayOop arg_array_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), argc, CHECK_(empty)); |
|
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2636 arg_array = objArrayHandle(THREAD, arg_array_oop); |
|
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|
2637 argument_info = arg_array; |
|
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|
2638 } |
|
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|
2639 for (int arg_i = 0; arg_i < argc; arg_i++) { |
|
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|
2640 int arg_index = pool->invoke_dynamic_argument_index_at(constant_pool_index, arg_i); |
|
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|
2641 oop arg_oop = pool->resolve_possibly_cached_constant_at(arg_index, CHECK_(empty)); |
|
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|
2642 if (arg_array.is_null()) { |
|
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|
2643 argument_info = Handle(THREAD, arg_oop); |
|
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|
2644 } else { |
|
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|
2645 arg_array->obj_at_put(arg_i, arg_oop); |
|
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|
2646 } |
|
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|
2647 } |
|
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|
2648 } |
|
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|
2649 |
|
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|
2650 argument_info_result = argument_info; // return argument_info to caller |
|
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|
2651 return bsm; |
|
1660
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|
2652 } |
|
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|
2653 } else { |
|
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|
2654 ShouldNotReachHere(); // verifier does not allow this |
|
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|
2655 } |
|
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|
2656 |
|
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
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1339
diff
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|
2657 return empty; |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
710
diff
changeset
|
2658 } |
|
be93aad57795
6655646: dynamic languages need dynamically linked call sites
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|
2659 |
| 0 | 2660 // Since the identity hash code for symbols changes when the symbols are |
| 2661 // moved from the regular perm gen (hash in the mark word) to the shared | |
| 2662 // spaces (hash is the address), the classes loaded into the dictionary | |
| 2663 // may be in the wrong buckets. | |
| 2664 | |
| 2665 void SystemDictionary::reorder_dictionary() { | |
| 2666 dictionary()->reorder_dictionary(); | |
| 2667 } | |
| 2668 | |
| 2669 | |
| 2670 void SystemDictionary::copy_buckets(char** top, char* end) { | |
| 2671 dictionary()->copy_buckets(top, end); | |
| 2672 } | |
| 2673 | |
| 2674 | |
| 2675 void SystemDictionary::copy_table(char** top, char* end) { | |
| 2676 dictionary()->copy_table(top, end); | |
| 2677 } | |
| 2678 | |
| 2679 | |
| 2680 void SystemDictionary::reverse() { | |
| 2681 dictionary()->reverse(); | |
| 2682 } | |
| 2683 | |
| 2684 int SystemDictionary::number_of_classes() { | |
| 2685 return dictionary()->number_of_entries(); | |
| 2686 } | |
| 2687 | |
| 2688 | |
| 2689 // ---------------------------------------------------------------------------- | |
| 2690 #ifndef PRODUCT | |
| 2691 | |
| 2692 void SystemDictionary::print() { | |
| 2693 dictionary()->print(); | |
| 2694 | |
| 2695 // Placeholders | |
| 2696 GCMutexLocker mu(SystemDictionary_lock); | |
| 2697 placeholders()->print(); | |
| 2698 | |
| 2699 // loader constraints - print under SD_lock | |
| 2700 constraints()->print(); | |
| 2701 } | |
| 2702 | |
| 2703 #endif | |
| 2704 | |
| 2705 void SystemDictionary::verify() { | |
| 2706 guarantee(dictionary() != NULL, "Verify of system dictionary failed"); | |
| 2707 guarantee(constraints() != NULL, | |
| 2708 "Verify of loader constraints failed"); | |
| 2709 guarantee(dictionary()->number_of_entries() >= 0 && | |
| 2710 placeholders()->number_of_entries() >= 0, | |
| 2711 "Verify of system dictionary failed"); | |
| 2712 | |
| 2713 // Verify dictionary | |
| 2714 dictionary()->verify(); | |
| 2715 | |
| 2716 GCMutexLocker mu(SystemDictionary_lock); | |
| 2717 placeholders()->verify(); | |
| 2718 | |
| 2719 // Verify constraint table | |
| 2720 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
|
2721 constraints()->verify(dictionary(), placeholders()); |
| 0 | 2722 } |
| 2723 | |
| 2724 | |
| 2725 void SystemDictionary::verify_obj_klass_present(Handle obj, | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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2001
diff
changeset
|
2726 Symbol* class_name, |
| 0 | 2727 Handle class_loader) { |
| 2728 GCMutexLocker mu(SystemDictionary_lock); | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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diff
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|
2729 Symbol* name; |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2001
diff
changeset
|
2730 |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2731 klassOop probe = find_class(class_name, class_loader); |
| 0 | 2732 if (probe == NULL) { |
| 2733 probe = SystemDictionary::find_shared_class(class_name); | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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2001
diff
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|
2734 if (probe == NULL) { |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2001
diff
changeset
|
2735 name = find_placeholder(class_name, class_loader); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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2001
diff
changeset
|
2736 } |
| 0 | 2737 } |
|
2177
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diff
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|
2738 guarantee(probe != NULL || name != NULL, |
|
3582bf76420e
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coleenp
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diff
changeset
|
2739 "Loaded klasses should be in SystemDictionary"); |
| 0 | 2740 } |
| 2741 | |
| 2742 #ifndef PRODUCT | |
| 2743 | |
| 2744 // statistics code | |
| 2745 class ClassStatistics: AllStatic { | |
| 2746 private: | |
| 2747 static int nclasses; // number of classes | |
| 2748 static int nmethods; // number of methods | |
| 2749 static int nmethoddata; // number of methodData | |
| 2750 static int class_size; // size of class objects in words | |
| 2751 static int method_size; // size of method objects in words | |
| 2752 static int debug_size; // size of debug info in methods | |
| 2753 static int methoddata_size; // size of methodData objects in words | |
| 2754 | |
| 2755 static void do_class(klassOop k) { | |
| 2756 nclasses++; | |
| 2757 class_size += k->size(); | |
| 2758 if (k->klass_part()->oop_is_instance()) { | |
| 2759 instanceKlass* ik = (instanceKlass*)k->klass_part(); | |
| 2760 class_size += ik->methods()->size(); | |
| 2761 class_size += ik->constants()->size(); | |
| 2762 class_size += ik->local_interfaces()->size(); | |
| 2763 class_size += ik->transitive_interfaces()->size(); | |
| 2764 // We do not have to count implementors, since we only store one! | |
| 3938 | 2765 class_size += ik->all_fields_count() * FieldInfo::field_slots; |
| 0 | 2766 } |
| 2767 } | |
| 2768 | |
| 2769 static void do_method(methodOop m) { | |
| 2770 nmethods++; | |
| 2771 method_size += m->size(); | |
| 2772 // class loader uses same objArray for empty vectors, so don't count these | |
| 2773 if (m->exception_table()->length() != 0) method_size += m->exception_table()->size(); | |
| 2774 if (m->has_stackmap_table()) { | |
| 2775 method_size += m->stackmap_data()->size(); | |
| 2776 } | |
| 2777 | |
| 2778 methodDataOop mdo = m->method_data(); | |
| 2779 if (mdo != NULL) { | |
| 2780 nmethoddata++; | |
| 2781 methoddata_size += mdo->size(); | |
| 2782 } | |
| 2783 } | |
| 2784 | |
| 2785 public: | |
| 2786 static void print() { | |
| 2787 SystemDictionary::classes_do(do_class); | |
| 2788 SystemDictionary::methods_do(do_method); | |
| 2789 tty->print_cr("Class statistics:"); | |
| 2790 tty->print_cr("%d classes (%d bytes)", nclasses, class_size * oopSize); | |
| 2791 tty->print_cr("%d methods (%d bytes = %d base + %d debug info)", nmethods, | |
| 2792 (method_size + debug_size) * oopSize, method_size * oopSize, debug_size * oopSize); | |
| 2793 tty->print_cr("%d methoddata (%d bytes)", nmethoddata, methoddata_size * oopSize); | |
| 2794 } | |
| 2795 }; | |
| 2796 | |
| 2797 | |
| 2798 int ClassStatistics::nclasses = 0; | |
| 2799 int ClassStatistics::nmethods = 0; | |
| 2800 int ClassStatistics::nmethoddata = 0; | |
| 2801 int ClassStatistics::class_size = 0; | |
| 2802 int ClassStatistics::method_size = 0; | |
| 2803 int ClassStatistics::debug_size = 0; | |
| 2804 int ClassStatistics::methoddata_size = 0; | |
| 2805 | |
| 2806 void SystemDictionary::print_class_statistics() { | |
| 2807 ResourceMark rm; | |
| 2808 ClassStatistics::print(); | |
| 2809 } | |
| 2810 | |
| 2811 | |
| 2812 class MethodStatistics: AllStatic { | |
| 2813 public: | |
| 2814 enum { | |
| 2815 max_parameter_size = 10 | |
| 2816 }; | |
| 2817 private: | |
| 2818 | |
| 2819 static int _number_of_methods; | |
| 2820 static int _number_of_final_methods; | |
| 2821 static int _number_of_static_methods; | |
| 2822 static int _number_of_native_methods; | |
| 2823 static int _number_of_synchronized_methods; | |
| 2824 static int _number_of_profiled_methods; | |
| 2825 static int _number_of_bytecodes; | |
| 2826 static int _parameter_size_profile[max_parameter_size]; | |
| 2827 static int _bytecodes_profile[Bytecodes::number_of_java_codes]; | |
| 2828 | |
| 2829 static void initialize() { | |
| 2830 _number_of_methods = 0; | |
| 2831 _number_of_final_methods = 0; | |
| 2832 _number_of_static_methods = 0; | |
| 2833 _number_of_native_methods = 0; | |
| 2834 _number_of_synchronized_methods = 0; | |
| 2835 _number_of_profiled_methods = 0; | |
| 2836 _number_of_bytecodes = 0; | |
| 2837 for (int i = 0; i < max_parameter_size ; i++) _parameter_size_profile[i] = 0; | |
| 2838 for (int j = 0; j < Bytecodes::number_of_java_codes; j++) _bytecodes_profile [j] = 0; | |
| 2839 }; | |
| 2840 | |
| 2841 static void do_method(methodOop m) { | |
| 2842 _number_of_methods++; | |
| 2843 // collect flag info | |
| 2844 if (m->is_final() ) _number_of_final_methods++; | |
| 2845 if (m->is_static() ) _number_of_static_methods++; | |
| 2846 if (m->is_native() ) _number_of_native_methods++; | |
| 2847 if (m->is_synchronized()) _number_of_synchronized_methods++; | |
| 2848 if (m->method_data() != NULL) _number_of_profiled_methods++; | |
| 2849 // collect parameter size info (add one for receiver, if any) | |
| 2850 _parameter_size_profile[MIN2(m->size_of_parameters() + (m->is_static() ? 0 : 1), max_parameter_size - 1)]++; | |
| 2851 // collect bytecodes info | |
| 2852 { | |
| 2853 Thread *thread = Thread::current(); | |
| 2854 HandleMark hm(thread); | |
| 2855 BytecodeStream s(methodHandle(thread, m)); | |
| 2856 Bytecodes::Code c; | |
| 2857 while ((c = s.next()) >= 0) { | |
| 2858 _number_of_bytecodes++; | |
| 2859 _bytecodes_profile[c]++; | |
| 2860 } | |
| 2861 } | |
| 2862 } | |
| 2863 | |
| 2864 public: | |
| 2865 static void print() { | |
| 2866 initialize(); | |
| 2867 SystemDictionary::methods_do(do_method); | |
| 2868 // generate output | |
| 2869 tty->cr(); | |
| 2870 tty->print_cr("Method statistics (static):"); | |
| 2871 // flag distribution | |
| 2872 tty->cr(); | |
| 2873 tty->print_cr("%6d final methods %6.1f%%", _number_of_final_methods , _number_of_final_methods * 100.0F / _number_of_methods); | |
| 2874 tty->print_cr("%6d static methods %6.1f%%", _number_of_static_methods , _number_of_static_methods * 100.0F / _number_of_methods); | |
| 2875 tty->print_cr("%6d native methods %6.1f%%", _number_of_native_methods , _number_of_native_methods * 100.0F / _number_of_methods); | |
| 2876 tty->print_cr("%6d synchronized methods %6.1f%%", _number_of_synchronized_methods, _number_of_synchronized_methods * 100.0F / _number_of_methods); | |
| 2877 tty->print_cr("%6d profiled methods %6.1f%%", _number_of_profiled_methods, _number_of_profiled_methods * 100.0F / _number_of_methods); | |
| 2878 // parameter size profile | |
| 2879 tty->cr(); | |
| 2880 { int tot = 0; | |
| 2881 int avg = 0; | |
| 2882 for (int i = 0; i < max_parameter_size; i++) { | |
| 2883 int n = _parameter_size_profile[i]; | |
| 2884 tot += n; | |
| 2885 avg += n*i; | |
| 2886 tty->print_cr("parameter size = %1d: %6d methods %5.1f%%", i, n, n * 100.0F / _number_of_methods); | |
| 2887 } | |
| 2888 assert(tot == _number_of_methods, "should be the same"); | |
| 2889 tty->print_cr(" %6d methods 100.0%%", _number_of_methods); | |
| 2890 tty->print_cr("(average parameter size = %3.1f including receiver, if any)", (float)avg / _number_of_methods); | |
| 2891 } | |
| 2892 // bytecodes profile | |
| 2893 tty->cr(); | |
| 2894 { int tot = 0; | |
| 2895 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) { | |
| 2896 if (Bytecodes::is_defined(i)) { | |
| 2897 Bytecodes::Code c = Bytecodes::cast(i); | |
| 2898 int n = _bytecodes_profile[c]; | |
| 2899 tot += n; | |
| 2900 tty->print_cr("%9d %7.3f%% %s", n, n * 100.0F / _number_of_bytecodes, Bytecodes::name(c)); | |
| 2901 } | |
| 2902 } | |
| 2903 assert(tot == _number_of_bytecodes, "should be the same"); | |
| 2904 tty->print_cr("%9d 100.000%%", _number_of_bytecodes); | |
| 2905 } | |
| 2906 tty->cr(); | |
| 2907 } | |
| 2908 }; | |
| 2909 | |
| 2910 int MethodStatistics::_number_of_methods; | |
| 2911 int MethodStatistics::_number_of_final_methods; | |
| 2912 int MethodStatistics::_number_of_static_methods; | |
| 2913 int MethodStatistics::_number_of_native_methods; | |
| 2914 int MethodStatistics::_number_of_synchronized_methods; | |
| 2915 int MethodStatistics::_number_of_profiled_methods; | |
| 2916 int MethodStatistics::_number_of_bytecodes; | |
| 2917 int MethodStatistics::_parameter_size_profile[MethodStatistics::max_parameter_size]; | |
| 2918 int MethodStatistics::_bytecodes_profile[Bytecodes::number_of_java_codes]; | |
| 2919 | |
| 2920 | |
| 2921 void SystemDictionary::print_method_statistics() { | |
| 2922 MethodStatistics::print(); | |
| 2923 } | |
| 2924 | |
| 2925 #endif // PRODUCT |