Mercurial > hg > truffle
annotate src/share/vm/classfile/systemDictionary.cpp @ 6866:633ba56cb013
Merge
| author | jmasa |
|---|---|
| date | Wed, 17 Oct 2012 13:59:57 -0700 |
| parents | d804e148cff8 dd2b66d09ccd |
| children | e522a00b91aa 070d523b96a7 |
| 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" |
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26 #include "classfile/classLoaderData.inline.hpp" |
| 1972 | 27 #include "classfile/dictionary.hpp" |
| 28 #include "classfile/javaClasses.hpp" | |
| 29 #include "classfile/loaderConstraints.hpp" | |
| 30 #include "classfile/placeholders.hpp" | |
| 31 #include "classfile/resolutionErrors.hpp" | |
| 32 #include "classfile/systemDictionary.hpp" | |
| 33 #include "classfile/vmSymbols.hpp" | |
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34 #include "compiler/compileBroker.hpp" |
| 1972 | 35 #include "interpreter/bytecodeStream.hpp" |
| 36 #include "interpreter/interpreter.hpp" | |
| 37 #include "memory/gcLocker.hpp" | |
| 38 #include "memory/oopFactory.hpp" | |
| 39 #include "oops/instanceKlass.hpp" | |
| 40 #include "oops/instanceRefKlass.hpp" | |
| 41 #include "oops/klass.inline.hpp" | |
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42 #include "oops/methodData.hpp" |
| 1972 | 43 #include "oops/objArrayKlass.hpp" |
| 44 #include "oops/oop.inline.hpp" | |
| 45 #include "oops/oop.inline2.hpp" | |
| 46 #include "oops/typeArrayKlass.hpp" | |
| 47 #include "prims/jvmtiEnvBase.hpp" | |
| 48 #include "prims/methodHandles.hpp" | |
| 49 #include "runtime/biasedLocking.hpp" | |
| 50 #include "runtime/fieldType.hpp" | |
| 51 #include "runtime/handles.inline.hpp" | |
| 52 #include "runtime/java.hpp" | |
| 53 #include "runtime/javaCalls.hpp" | |
| 54 #include "runtime/mutexLocker.hpp" | |
| 55 #include "runtime/signature.hpp" | |
| 56 #include "services/classLoadingService.hpp" | |
| 57 #include "services/threadService.hpp" | |
| 0 | 58 |
| 59 | |
| 1903 | 60 Dictionary* SystemDictionary::_dictionary = NULL; |
| 61 PlaceholderTable* SystemDictionary::_placeholders = NULL; | |
| 62 Dictionary* SystemDictionary::_shared_dictionary = NULL; | |
| 63 LoaderConstraintTable* SystemDictionary::_loader_constraints = NULL; | |
| 64 ResolutionErrorTable* SystemDictionary::_resolution_errors = NULL; | |
| 65 SymbolPropertyTable* SystemDictionary::_invoke_method_table = NULL; | |
| 0 | 66 |
| 67 | |
| 68 int SystemDictionary::_number_of_modifications = 0; | |
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69 int SystemDictionary::_sdgeneration = 0; |
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70 const int SystemDictionary::_primelist[_prime_array_size] = {1009,2017,4049,5051,10103, |
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71 20201,40423,99991}; |
| 0 | 72 |
| 73 oop SystemDictionary::_system_loader_lock_obj = NULL; | |
| 74 | |
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75 Klass* SystemDictionary::_well_known_klasses[SystemDictionary::WKID_LIMIT] |
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76 = { NULL /*, NULL...*/ }; |
| 0 | 77 |
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78 Klass* SystemDictionary::_box_klasses[T_VOID+1] = { NULL /*, NULL...*/ }; |
| 0 | 79 |
| 80 oop SystemDictionary::_java_system_loader = NULL; | |
| 81 | |
| 82 bool SystemDictionary::_has_loadClassInternal = false; | |
| 83 bool SystemDictionary::_has_checkPackageAccess = false; | |
| 84 | |
| 85 // lazily initialized klass variables | |
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86 Klass* volatile SystemDictionary::_abstract_ownable_synchronizer_klass = NULL; |
| 0 | 87 |
| 88 | |
| 89 // ---------------------------------------------------------------------------- | |
| 90 // Java-level SystemLoader | |
| 91 | |
| 92 oop SystemDictionary::java_system_loader() { | |
| 93 return _java_system_loader; | |
| 94 } | |
| 95 | |
| 96 void SystemDictionary::compute_java_system_loader(TRAPS) { | |
| 1142 | 97 KlassHandle system_klass(THREAD, WK_KLASS(ClassLoader_klass)); |
| 0 | 98 JavaValue result(T_OBJECT); |
| 99 JavaCalls::call_static(&result, | |
| 1142 | 100 KlassHandle(THREAD, WK_KLASS(ClassLoader_klass)), |
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101 vmSymbols::getSystemClassLoader_name(), |
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102 vmSymbols::void_classloader_signature(), |
| 0 | 103 CHECK); |
| 104 | |
| 105 _java_system_loader = (oop)result.get_jobject(); | |
| 106 } | |
| 107 | |
| 108 | |
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109 ClassLoaderData* SystemDictionary::register_loader(Handle class_loader) { |
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110 if (class_loader() == NULL) return ClassLoaderData::the_null_class_loader_data(); |
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111 return ClassLoaderDataGraph::find_or_create(class_loader); |
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112 } |
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113 |
| 0 | 114 // ---------------------------------------------------------------------------- |
| 115 // debugging | |
| 116 | |
| 117 #ifdef ASSERT | |
| 118 | |
| 119 // return true if class_name contains no '.' (internal format is '/') | |
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120 bool SystemDictionary::is_internal_format(Symbol* class_name) { |
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121 if (class_name != NULL) { |
| 0 | 122 ResourceMark rm; |
| 123 char* name = class_name->as_C_string(); | |
| 124 return strchr(name, '.') == NULL; | |
| 125 } else { | |
| 126 return true; | |
| 127 } | |
| 128 } | |
| 129 | |
| 130 #endif | |
| 131 | |
| 132 // ---------------------------------------------------------------------------- | |
| 514 | 133 // Parallel class loading check |
| 134 | |
| 135 bool SystemDictionary::is_parallelCapable(Handle class_loader) { | |
| 136 if (UnsyncloadClass || class_loader.is_null()) return true; | |
| 137 if (AlwaysLockClassLoader) return false; | |
| 3938 | 138 return java_lang_ClassLoader::parallelCapable(class_loader()); |
| 514 | 139 } |
| 140 // ---------------------------------------------------------------------------- | |
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141 // ParallelDefineClass flag does not apply to bootclass loader |
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142 bool SystemDictionary::is_parallelDefine(Handle class_loader) { |
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143 if (class_loader.is_null()) return false; |
| 3938 | 144 if (AllowParallelDefineClass && java_lang_ClassLoader::parallelCapable(class_loader())) { |
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145 return true; |
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146 } |
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147 return false; |
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148 } |
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149 // ---------------------------------------------------------------------------- |
| 0 | 150 // Resolving of classes |
| 151 | |
| 152 // Forwards to resolve_or_null | |
| 153 | |
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154 Klass* SystemDictionary::resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS) { |
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155 Klass* klass = resolve_or_null(class_name, class_loader, protection_domain, THREAD); |
| 0 | 156 if (HAS_PENDING_EXCEPTION || klass == NULL) { |
| 157 KlassHandle k_h(THREAD, klass); | |
| 158 // can return a null klass | |
| 159 klass = handle_resolution_exception(class_name, class_loader, protection_domain, throw_error, k_h, THREAD); | |
| 160 } | |
| 161 return klass; | |
| 162 } | |
| 163 | |
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164 Klass* SystemDictionary::handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS) { |
| 0 | 165 if (HAS_PENDING_EXCEPTION) { |
| 166 // If we have a pending exception we forward it to the caller, unless throw_error is true, | |
| 167 // in which case we have to check whether the pending exception is a ClassNotFoundException, | |
| 168 // and if so convert it to a NoClassDefFoundError | |
| 169 // And chain the original ClassNotFoundException | |
| 1142 | 170 if (throw_error && PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass())) { |
| 0 | 171 ResourceMark rm(THREAD); |
| 172 assert(klass_h() == NULL, "Should not have result with exception pending"); | |
| 173 Handle e(THREAD, PENDING_EXCEPTION); | |
| 174 CLEAR_PENDING_EXCEPTION; | |
| 175 THROW_MSG_CAUSE_0(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string(), e); | |
| 176 } else { | |
| 177 return NULL; | |
| 178 } | |
| 179 } | |
| 180 // Class not found, throw appropriate error or exception depending on value of throw_error | |
| 181 if (klass_h() == NULL) { | |
| 182 ResourceMark rm(THREAD); | |
| 183 if (throw_error) { | |
| 184 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string()); | |
| 185 } else { | |
| 186 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), class_name->as_C_string()); | |
| 187 } | |
| 188 } | |
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189 return (Klass*)klass_h(); |
| 0 | 190 } |
| 191 | |
| 192 | |
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193 Klass* SystemDictionary::resolve_or_fail(Symbol* class_name, |
| 0 | 194 bool throw_error, TRAPS) |
| 195 { | |
| 196 return resolve_or_fail(class_name, Handle(), Handle(), throw_error, THREAD); | |
| 197 } | |
| 198 | |
| 199 | |
| 200 // Forwards to resolve_instance_class_or_null | |
| 201 | |
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202 Klass* SystemDictionary::resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS) { |
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203 assert(!THREAD->is_Compiler_thread(), |
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204 err_msg("can not load classes with compiler thread: class=%s, classloader=%s", |
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205 class_name->as_C_string(), |
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206 class_loader.is_null() ? "null" : class_loader->klass()->name()->as_C_string())); |
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207 if (FieldType::is_array(class_name)) { |
| 0 | 208 return resolve_array_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); |
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209 } else if (FieldType::is_obj(class_name)) { |
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210 ResourceMark rm(THREAD); |
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211 // Ignore wrapping L and ;. |
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212 TempNewSymbol name = SymbolTable::new_symbol(class_name->as_C_string() + 1, |
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213 class_name->utf8_length() - 2, CHECK_NULL); |
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214 return resolve_instance_class_or_null(name, class_loader, protection_domain, CHECK_NULL); |
| 0 | 215 } else { |
| 216 return resolve_instance_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); | |
| 217 } | |
| 218 } | |
| 219 | |
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220 Klass* SystemDictionary::resolve_or_null(Symbol* class_name, TRAPS) { |
| 0 | 221 return resolve_or_null(class_name, Handle(), Handle(), THREAD); |
| 222 } | |
| 223 | |
| 224 // Forwards to resolve_instance_class_or_null | |
| 225 | |
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226 Klass* SystemDictionary::resolve_array_class_or_null(Symbol* class_name, |
| 0 | 227 Handle class_loader, |
| 228 Handle protection_domain, | |
| 229 TRAPS) { | |
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230 assert(FieldType::is_array(class_name), "must be array"); |
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231 Klass* k = NULL; |
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232 FieldArrayInfo fd; |
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233 // dimension and object_key in FieldArrayInfo are assigned as a side-effect |
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234 // of this call |
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235 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_NULL); |
| 0 | 236 if (t == T_OBJECT) { |
| 237 // naked oop "k" is OK here -- we assign back into it | |
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238 k = SystemDictionary::resolve_instance_class_or_null(fd.object_key(), |
| 0 | 239 class_loader, |
| 240 protection_domain, | |
| 241 CHECK_NULL); | |
| 242 if (k != NULL) { | |
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243 k = Klass::cast(k)->array_klass(fd.dimension(), CHECK_NULL); |
| 0 | 244 } |
| 245 } else { | |
| 246 k = Universe::typeArrayKlassObj(t); | |
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247 k = TypeArrayKlass::cast(k)->array_klass(fd.dimension(), CHECK_NULL); |
| 0 | 248 } |
| 249 return k; | |
| 250 } | |
| 251 | |
| 252 | |
| 253 // Must be called for any super-class or super-interface resolution | |
| 254 // during class definition to allow class circularity checking | |
| 255 // super-interface callers: | |
| 256 // parse_interfaces - for defineClass & jvmtiRedefineClasses | |
| 257 // super-class callers: | |
| 258 // ClassFileParser - for defineClass & jvmtiRedefineClasses | |
| 259 // load_shared_class - while loading a class from shared archive | |
| 514 | 260 // resolve_instance_class_or_null: |
| 261 // via: handle_parallel_super_load | |
| 0 | 262 // when resolving a class that has an existing placeholder with |
| 263 // a saved superclass [i.e. a defineClass is currently in progress] | |
| 264 // if another thread is trying to resolve the class, it must do | |
| 265 // super-class checks on its own thread to catch class circularity | |
| 266 // This last call is critical in class circularity checking for cases | |
| 267 // where classloading is delegated to different threads and the | |
| 268 // classloader lock is released. | |
| 269 // Take the case: Base->Super->Base | |
| 270 // 1. If thread T1 tries to do a defineClass of class Base | |
| 271 // resolve_super_or_fail creates placeholder: T1, Base (super Super) | |
| 272 // 2. resolve_instance_class_or_null does not find SD or placeholder for Super | |
| 273 // so it tries to load Super | |
| 274 // 3. If we load the class internally, or user classloader uses same thread | |
| 275 // loadClassFromxxx or defineClass via parseClassFile Super ... | |
| 276 // 3.1 resolve_super_or_fail creates placeholder: T1, Super (super Base) | |
| 277 // 3.3 resolve_instance_class_or_null Base, finds placeholder for Base | |
| 278 // 3.4 calls resolve_super_or_fail Base | |
| 279 // 3.5 finds T1,Base -> throws class circularity | |
| 280 //OR 4. If T2 tries to resolve Super via defineClass Super ... | |
| 281 // 4.1 resolve_super_or_fail creates placeholder: T2, Super (super Base) | |
| 282 // 4.2 resolve_instance_class_or_null Base, finds placeholder for Base (super Super) | |
| 283 // 4.3 calls resolve_super_or_fail Super in parallel on own thread T2 | |
| 284 // 4.4 finds T2, Super -> throws class circularity | |
| 285 // Must be called, even if superclass is null, since this is | |
| 286 // where the placeholder entry is created which claims this | |
| 287 // thread is loading this class/classloader. | |
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288 Klass* SystemDictionary::resolve_super_or_fail(Symbol* child_name, |
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289 Symbol* class_name, |
| 0 | 290 Handle class_loader, |
| 291 Handle protection_domain, | |
| 292 bool is_superclass, | |
| 293 TRAPS) { | |
| 294 // Double-check, if child class is already loaded, just return super-class,interface | |
| 295 // Don't add a placedholder if already loaded, i.e. already in system dictionary | |
| 296 // Make sure there's a placeholder for the *child* before resolving. | |
| 297 // Used as a claim that this thread is currently loading superclass/classloader | |
| 298 // Used here for ClassCircularity checks and also for heap verification | |
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299 // (every InstanceKlass in the heap needs to be in the system dictionary |
| 0 | 300 // or have a placeholder). |
| 301 // Must check ClassCircularity before checking if super class is already loaded | |
| 302 // | |
| 303 // We might not already have a placeholder if this child_name was | |
| 304 // first seen via resolve_from_stream (jni_DefineClass or JVM_DefineClass); | |
| 305 // the name of the class might not be known until the stream is actually | |
| 306 // parsed. | |
| 307 // Bugs 4643874, 4715493 | |
| 308 // compute_hash can have a safepoint | |
| 309 | |
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310 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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311 unsigned int d_hash = dictionary()->compute_hash(child_name, loader_data); |
| 0 | 312 int d_index = dictionary()->hash_to_index(d_hash); |
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313 unsigned int p_hash = placeholders()->compute_hash(child_name, loader_data); |
| 0 | 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); | |
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320 Klass* childk = find_class(d_index, d_hash, child_name, loader_data); |
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321 Klass* quicksuperk; |
| 0 | 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) && | |
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329 ((quicksuperk = InstanceKlass::cast(childk)->super()) != NULL) && |
| 0 | 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 { | |
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335 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, loader_data); |
| 0 | 336 if (probe && probe->check_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER)) { |
| 337 throw_circularity_error = true; | |
| 338 } | |
| 514 | 339 } |
| 340 if (!throw_circularity_error) { | |
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341 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, child_name, loader_data, PlaceholderTable::LOAD_SUPER, class_name, THREAD); |
| 0 | 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 |
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352 Klass* superk = NULL; |
| 0 | 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); | |
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365 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, loader_data); |
| 0 | 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 | |
| 1142 | 394 KlassHandle system_loader(THREAD, SystemDictionary::ClassLoader_klass()); |
| 0 | 395 JavaCalls::call_special(&result, |
| 396 class_loader, | |
| 397 system_loader, | |
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398 vmSymbols::checkPackageAccess_name(), |
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399 vmSymbols::class_protectiondomain_signature(), |
| 0 | 400 Handle(THREAD, klass->java_mirror()), |
| 401 protection_domain, | |
| 402 THREAD); | |
| 403 | |
| 404 if (TraceProtectionDomainVerification) { | |
| 405 if (HAS_PENDING_EXCEPTION) { | |
| 406 tty->print_cr(" -> DENIED !!!!!!!!!!!!!!!!!!!!!"); | |
| 407 } else { | |
| 408 tty->print_cr(" -> granted"); | |
| 409 } | |
| 410 tty->cr(); | |
| 411 } | |
| 412 | |
| 413 if (HAS_PENDING_EXCEPTION) return; | |
| 414 | |
| 415 // If no exception has been thrown, we have validated the protection domain | |
| 416 // Insert the protection domain of the initiating class into the set. | |
| 417 { | |
| 418 // We recalculate the entry here -- we've called out to java since | |
| 419 // the last time it was calculated. | |
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420 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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421 |
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422 Symbol* kn = klass->name(); |
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423 unsigned int d_hash = dictionary()->compute_hash(kn, loader_data); |
| 0 | 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; | |
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436 dictionary()->add_protection_domain(d_index, d_hash, klass, loader_data, |
| 0 | 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 |
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493 // Returns non-null Klass* if other thread has completed load |
| 0 | 494 // and we are done, |
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495 // If return null Klass* and no pending exception, the caller must load the class |
| 0 | 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 | |
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501 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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502 unsigned int d_hash = dictionary()->compute_hash(name, loader_data); |
| 0 | 503 int d_index = dictionary()->hash_to_index(d_hash); |
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504 unsigned int p_hash = placeholders()->compute_hash(name, loader_data); |
| 0 | 505 int p_index = placeholders()->hash_to_index(p_hash); |
| 506 | |
| 507 // superk is not used, resolve_super called for circularity check only | |
| 508 // This code is reached in two situations. One if this thread | |
| 509 // is loading the same class twice (e.g. ClassCircularity, or | |
| 510 // java.lang.instrument). | |
| 511 // The second is if another thread started the resolve_super first | |
| 512 // and has not yet finished. | |
| 513 // In both cases the original caller will clean up the placeholder | |
| 514 // entry on error. | |
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515 Klass* superk = SystemDictionary::resolve_super_or_fail(name, |
| 0 | 516 superclassname, |
| 517 class_loader, | |
| 518 protection_domain, | |
| 519 true, | |
| 520 CHECK_(nh)); | |
| 521 // We don't redefine the class, so we just need to clean up if there | |
| 522 // was not an error (don't want to modify any system dictionary | |
| 523 // data structures). | |
| 524 { | |
| 525 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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526 placeholders()->find_and_remove(p_index, p_hash, name, loader_data, THREAD); |
| 0 | 527 SystemDictionary_lock->notify_all(); |
| 528 } | |
| 529 | |
| 514 | 530 // parallelCapable class loaders do NOT wait for parallel superclass loads to complete |
| 531 // Serial class loaders and bootstrap classloader do wait for superclass loads | |
| 532 if (!class_loader.is_null() && is_parallelCapable(class_loader)) { | |
| 0 | 533 MutexLocker mu(SystemDictionary_lock, THREAD); |
| 534 // Check if classloading completed while we were loading superclass or waiting | |
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535 Klass* check = find_class(d_index, d_hash, name, loader_data); |
| 0 | 536 if (check != NULL) { |
| 537 // Klass is already loaded, so just return it | |
| 538 return(instanceKlassHandle(THREAD, check)); | |
| 539 } else { | |
| 540 return nh; | |
| 541 } | |
| 542 } | |
| 543 | |
| 544 // must loop to both handle other placeholder updates | |
| 545 // and spurious notifications | |
| 546 bool super_load_in_progress = true; | |
| 547 PlaceholderEntry* placeholder; | |
| 548 while (super_load_in_progress) { | |
| 549 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 550 // Check if classloading completed while we were loading superclass or waiting | |
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551 Klass* check = find_class(d_index, d_hash, name, loader_data); |
| 0 | 552 if (check != NULL) { |
| 553 // Klass is already loaded, so just return it | |
| 554 return(instanceKlassHandle(THREAD, check)); | |
| 555 } else { | |
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556 placeholder = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
| 0 | 557 if (placeholder && placeholder->super_load_in_progress() ){ |
| 558 // Before UnsyncloadClass: | |
| 559 // We only get here if the application has released the | |
| 560 // classloader lock when another thread was in the middle of loading a | |
| 561 // superclass/superinterface for this class, and now | |
| 562 // this thread is also trying to load this class. | |
| 563 // To minimize surprises, the first thread that started to | |
| 564 // load a class should be the one to complete the loading | |
| 565 // with the classfile it initially expected. | |
| 566 // This logic has the current thread wait once it has done | |
| 567 // all the superclass/superinterface loading it can, until | |
| 568 // the original thread completes the class loading or fails | |
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569 // If it completes we will use the resulting InstanceKlass |
| 0 | 570 // which we will find below in the systemDictionary. |
| 571 // We also get here for parallel bootstrap classloader | |
| 572 if (class_loader.is_null()) { | |
| 573 SystemDictionary_lock->wait(); | |
| 574 } else { | |
| 575 double_lock_wait(lockObject, THREAD); | |
| 576 } | |
| 577 } else { | |
| 578 // If not in SD and not in PH, other thread's load must have failed | |
| 579 super_load_in_progress = false; | |
| 580 } | |
| 581 } | |
| 582 } | |
| 583 return (nh); | |
| 584 } | |
| 585 | |
| 586 | |
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587 Klass* SystemDictionary::resolve_instance_class_or_null(Symbol* name, Handle class_loader, Handle protection_domain, TRAPS) { |
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588 assert(name != NULL && !FieldType::is_array(name) && |
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589 !FieldType::is_obj(name), "invalid class name"); |
| 0 | 590 |
| 591 // UseNewReflection | |
| 592 // Fix for 4474172; see evaluation for more details | |
| 593 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); | |
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594 ClassLoaderData *loader_data = register_loader(class_loader); |
| 0 | 595 |
| 596 // Do lookup to see if class already exist and the protection domain | |
| 597 // has the right access | |
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598 unsigned int d_hash = dictionary()->compute_hash(name, loader_data); |
| 0 | 599 int d_index = dictionary()->hash_to_index(d_hash); |
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600 Klass* probe = dictionary()->find(d_index, d_hash, name, loader_data, |
| 0 | 601 protection_domain, THREAD); |
| 602 if (probe != NULL) return probe; | |
| 603 | |
| 604 | |
| 605 // Non-bootstrap class loaders will call out to class loader and | |
| 606 // define via jvm/jni_DefineClass which will acquire the | |
| 607 // class loader object lock to protect against multiple threads | |
| 608 // defining the class in parallel by accident. | |
| 609 // This lock must be acquired here so the waiter will find | |
| 610 // any successful result in the SystemDictionary and not attempt | |
| 611 // the define | |
| 514 | 612 // ParallelCapable Classloaders and the bootstrap classloader, |
| 0 | 613 // or all classloaders with UnsyncloadClass do not acquire lock here |
| 614 bool DoObjectLock = true; | |
| 514 | 615 if (is_parallelCapable(class_loader)) { |
| 0 | 616 DoObjectLock = false; |
| 617 } | |
| 618 | |
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619 unsigned int p_hash = placeholders()->compute_hash(name, loader_data); |
| 0 | 620 int p_index = placeholders()->hash_to_index(p_hash); |
| 621 | |
| 622 // Class is not in SystemDictionary so we have to do loading. | |
| 623 // Make sure we are synchronized on the class loader before we proceed | |
| 624 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
| 625 check_loader_lock_contention(lockObject, THREAD); | |
| 626 ObjectLocker ol(lockObject, THREAD, DoObjectLock); | |
| 627 | |
| 628 // Check again (after locking) if class already exist in SystemDictionary | |
| 629 bool class_has_been_loaded = false; | |
| 630 bool super_load_in_progress = false; | |
| 631 bool havesupername = false; | |
| 632 instanceKlassHandle k; | |
| 633 PlaceholderEntry* placeholder; | |
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634 Symbol* superclassname = NULL; |
| 0 | 635 |
| 636 { | |
| 637 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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638 Klass* check = find_class(d_index, d_hash, name, loader_data); |
| 0 | 639 if (check != NULL) { |
| 640 // Klass is already loaded, so just return it | |
| 641 class_has_been_loaded = true; | |
| 642 k = instanceKlassHandle(THREAD, check); | |
| 643 } else { | |
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644 placeholder = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
| 0 | 645 if (placeholder && placeholder->super_load_in_progress()) { |
| 646 super_load_in_progress = true; | |
| 647 if (placeholder->havesupername() == true) { | |
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648 superclassname = placeholder->supername(); |
| 0 | 649 havesupername = true; |
| 650 } | |
| 651 } | |
| 652 } | |
| 653 } | |
| 654 | |
| 655 // If the class in is in the placeholder table, class loading is in progress | |
| 656 if (super_load_in_progress && havesupername==true) { | |
| 657 k = SystemDictionary::handle_parallel_super_load(name, superclassname, | |
| 658 class_loader, protection_domain, lockObject, THREAD); | |
| 659 if (HAS_PENDING_EXCEPTION) { | |
| 660 return NULL; | |
| 661 } | |
| 662 if (!k.is_null()) { | |
| 663 class_has_been_loaded = true; | |
| 664 } | |
| 665 } | |
| 666 | |
| 667 if (!class_has_been_loaded) { | |
| 668 | |
| 669 // add placeholder entry to record loading instance class | |
| 670 // Five cases: | |
| 671 // All cases need to prevent modifying bootclasssearchpath | |
| 672 // in parallel with a classload of same classname | |
| 514 | 673 // Redefineclasses uses existence of the placeholder for the duration |
| 674 // of the class load to prevent concurrent redefinition of not completely | |
| 675 // defined classes. | |
| 0 | 676 // case 1. traditional classloaders that rely on the classloader object lock |
| 677 // - no other need for LOAD_INSTANCE | |
| 678 // case 2. traditional classloaders that break the classloader object lock | |
| 679 // as a deadlock workaround. Detection of this case requires that | |
| 680 // this check is done while holding the classloader object lock, | |
| 681 // and that lock is still held when calling classloader's loadClass. | |
| 682 // For these classloaders, we ensure that the first requestor | |
| 683 // completes the load and other requestors wait for completion. | |
| 684 // case 3. UnsyncloadClass - don't use objectLocker | |
| 685 // With this flag, we allow parallel classloading of a | |
| 686 // class/classloader pair | |
| 687 // case4. Bootstrap classloader - don't own objectLocker | |
| 688 // This classloader supports parallelism at the classloader level, | |
| 689 // but only allows a single load of a class/classloader pair. | |
| 690 // No performance benefit and no deadlock issues. | |
| 514 | 691 // case 5. parallelCapable user level classloaders - without objectLocker |
| 692 // Allow parallel classloading of a class/classloader pair | |
| 0 | 693 bool throw_circularity_error = false; |
| 694 { | |
| 695 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 514 | 696 if (class_loader.is_null() || !is_parallelCapable(class_loader)) { |
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697 PlaceholderEntry* oldprobe = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
| 0 | 698 if (oldprobe) { |
| 699 // only need check_seen_thread once, not on each loop | |
| 700 // 6341374 java/lang/Instrument with -Xcomp | |
| 701 if (oldprobe->check_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE)) { | |
| 702 throw_circularity_error = true; | |
| 703 } else { | |
| 704 // case 1: traditional: should never see load_in_progress. | |
| 705 while (!class_has_been_loaded && oldprobe && oldprobe->instance_load_in_progress()) { | |
| 706 | |
| 707 // case 4: bootstrap classloader: prevent futile classloading, | |
| 708 // wait on first requestor | |
| 709 if (class_loader.is_null()) { | |
| 710 SystemDictionary_lock->wait(); | |
| 711 } else { | |
| 712 // case 2: traditional with broken classloader lock. wait on first | |
| 713 // requestor. | |
| 714 double_lock_wait(lockObject, THREAD); | |
| 715 } | |
| 716 // Check if classloading completed while we were waiting | |
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717 Klass* check = find_class(d_index, d_hash, name, loader_data); |
| 0 | 718 if (check != NULL) { |
| 719 // Klass is already loaded, so just return it | |
| 720 k = instanceKlassHandle(THREAD, check); | |
| 721 class_has_been_loaded = true; | |
| 722 } | |
| 723 // check if other thread failed to load and cleaned up | |
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724 oldprobe = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
| 0 | 725 } |
| 726 } | |
| 727 } | |
| 728 } | |
| 729 // All cases: add LOAD_INSTANCE | |
| 514 | 730 // case 3: UnsyncloadClass || case 5: parallelCapable: allow competing threads to try |
| 0 | 731 // LOAD_INSTANCE in parallel |
| 732 // add placeholder entry even if error - callers will remove on error | |
| 514 | 733 if (!throw_circularity_error && !class_has_been_loaded) { |
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734 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, name, loader_data, PlaceholderTable::LOAD_INSTANCE, NULL, THREAD); |
| 0 | 735 // For class loaders that do not acquire the classloader object lock, |
| 736 // if they did not catch another thread holding LOAD_INSTANCE, | |
| 737 // need a check analogous to the acquire ObjectLocker/find_class | |
| 738 // i.e. now that we hold the LOAD_INSTANCE token on loading this class/CL | |
| 739 // one final check if the load has already completed | |
| 514 | 740 // class loaders holding the ObjectLock shouldn't find the class here |
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741 Klass* check = find_class(d_index, d_hash, name, loader_data); |
| 0 | 742 if (check != NULL) { |
| 743 // Klass is already loaded, so just return it | |
| 744 k = instanceKlassHandle(THREAD, check); | |
| 745 class_has_been_loaded = true; | |
| 746 newprobe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE); | |
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747 placeholders()->find_and_remove(p_index, p_hash, name, loader_data, THREAD); |
| 514 | 748 SystemDictionary_lock->notify_all(); |
| 0 | 749 } |
| 750 } | |
| 751 } | |
| 752 // must throw error outside of owning lock | |
| 753 if (throw_circularity_error) { | |
| 754 ResourceMark rm(THREAD); | |
| 755 THROW_MSG_0(vmSymbols::java_lang_ClassCircularityError(), name->as_C_string()); | |
| 756 } | |
| 757 | |
| 758 if (!class_has_been_loaded) { | |
| 759 | |
| 760 // Do actual loading | |
| 761 k = load_instance_class(name, class_loader, THREAD); | |
| 762 | |
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763 // For UnsyncloadClass only |
| 0 | 764 // If they got a linkageError, check if a parallel class load succeeded. |
| 765 // If it did, then for bytecode resolution the specification requires | |
| 766 // that we return the same result we did for the other thread, i.e. the | |
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767 // successfully loaded InstanceKlass |
| 0 | 768 // Should not get here for classloaders that support parallelism |
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769 // with the new cleaner mechanism, even with AllowParallelDefineClass |
| 514 | 770 // Bootstrap goes through here to allow for an extra guarantee check |
| 0 | 771 if (UnsyncloadClass || (class_loader.is_null())) { |
| 772 if (k.is_null() && HAS_PENDING_EXCEPTION | |
| 1142 | 773 && PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { |
| 0 | 774 MutexLocker mu(SystemDictionary_lock, THREAD); |
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775 Klass* check = find_class(d_index, d_hash, name, loader_data); |
| 0 | 776 if (check != NULL) { |
| 777 // Klass is already loaded, so just use it | |
| 778 k = instanceKlassHandle(THREAD, check); | |
| 779 CLEAR_PENDING_EXCEPTION; | |
| 780 guarantee((!class_loader.is_null()), "dup definition for bootstrap loader?"); | |
| 781 } | |
| 782 } | |
| 783 } | |
| 784 | |
| 785 // clean up placeholder entries for success or error | |
| 786 // This cleans up LOAD_INSTANCE entries | |
| 787 // It also cleans up LOAD_SUPER entries on errors from | |
| 788 // calling load_instance_class | |
| 789 { | |
| 790 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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791 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
| 0 | 792 if (probe != NULL) { |
| 793 probe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE); | |
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794 placeholders()->find_and_remove(p_index, p_hash, name, loader_data, THREAD); |
| 0 | 795 SystemDictionary_lock->notify_all(); |
| 796 } | |
| 797 } | |
| 798 | |
| 799 // If everything was OK (no exceptions, no null return value), and | |
| 800 // class_loader is NOT the defining loader, do a little more bookkeeping. | |
| 801 if (!HAS_PENDING_EXCEPTION && !k.is_null() && | |
| 802 k->class_loader() != class_loader()) { | |
| 803 | |
| 804 check_constraints(d_index, d_hash, k, class_loader, false, THREAD); | |
| 805 | |
| 806 // Need to check for a PENDING_EXCEPTION again; check_constraints | |
| 807 // can throw and doesn't use the CHECK macro. | |
| 808 if (!HAS_PENDING_EXCEPTION) { | |
| 809 { // Grabbing the Compile_lock prevents systemDictionary updates | |
| 810 // during compilations. | |
| 811 MutexLocker mu(Compile_lock, THREAD); | |
| 812 update_dictionary(d_index, d_hash, p_index, p_hash, | |
| 813 k, class_loader, THREAD); | |
| 814 } | |
| 815 if (JvmtiExport::should_post_class_load()) { | |
| 816 Thread *thread = THREAD; | |
| 817 assert(thread->is_Java_thread(), "thread->is_Java_thread()"); | |
| 818 JvmtiExport::post_class_load((JavaThread *) thread, k()); | |
| 819 } | |
| 820 } | |
| 821 } | |
| 822 if (HAS_PENDING_EXCEPTION || k.is_null()) { | |
| 823 // On error, clean up placeholders | |
| 824 { | |
| 825 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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826 placeholders()->find_and_remove(p_index, p_hash, name, loader_data, THREAD); |
| 0 | 827 SystemDictionary_lock->notify_all(); |
| 828 } | |
| 829 return NULL; | |
| 830 } | |
| 831 } | |
| 832 } | |
| 833 | |
| 834 #ifdef ASSERT | |
| 835 { | |
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836 ClassLoaderData* loader_data = k->class_loader_data(); |
| 0 | 837 MutexLocker mu(SystemDictionary_lock, THREAD); |
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838 Klass* kk = find_class(name, loader_data); |
| 0 | 839 assert(kk == k(), "should be present in dictionary"); |
| 840 } | |
| 841 #endif | |
| 842 | |
| 843 // return if the protection domain in NULL | |
| 844 if (protection_domain() == NULL) return k(); | |
| 845 | |
| 846 // Check the protection domain has the right access | |
| 847 { | |
| 848 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 849 // Note that we have an entry, and entries can be deleted only during GC, | |
| 850 // so we cannot allow GC to occur while we're holding this entry. | |
| 851 // We're using a No_Safepoint_Verifier to catch any place where we | |
| 852 // might potentially do a GC at all. | |
| 853 // SystemDictionary::do_unloading() asserts that classes are only | |
| 854 // unloaded at a safepoint. | |
| 855 No_Safepoint_Verifier nosafepoint; | |
| 856 if (dictionary()->is_valid_protection_domain(d_index, d_hash, name, | |
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857 loader_data, |
| 0 | 858 protection_domain)) { |
| 859 return k(); | |
| 860 } | |
| 861 } | |
| 862 | |
| 863 // Verify protection domain. If it fails an exception is thrown | |
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864 validate_protection_domain(k, class_loader, protection_domain, CHECK_NULL); |
| 0 | 865 |
| 866 return k(); | |
| 867 } | |
| 868 | |
| 869 | |
| 870 // This routine does not lock the system dictionary. | |
| 871 // | |
| 872 // Since readers don't hold a lock, we must make sure that system | |
| 873 // dictionary entries are only removed at a safepoint (when only one | |
| 874 // thread is running), and are added to in a safe way (all links must | |
| 875 // be updated in an MT-safe manner). | |
| 876 // | |
| 877 // Callers should be aware that an entry could be added just after | |
| 878 // _dictionary->bucket(index) is read here, so the caller will not see | |
| 879 // the new entry. | |
| 880 | |
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881 Klass* SystemDictionary::find(Symbol* class_name, |
| 0 | 882 Handle class_loader, |
| 883 Handle protection_domain, | |
| 884 TRAPS) { | |
| 885 | |
|
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886 // UseNewReflection |
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887 // The result of this call should be consistent with the result |
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888 // of the call to resolve_instance_class_or_null(). |
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889 // See evaluation 6790209 and 4474172 for more details. |
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890 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); |
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891 ClassLoaderData* loader_data = register_loader(class_loader); |
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892 |
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893 unsigned int d_hash = dictionary()->compute_hash(class_name, loader_data); |
| 0 | 894 int d_index = dictionary()->hash_to_index(d_hash); |
| 895 | |
| 896 { | |
| 897 // Note that we have an entry, and entries can be deleted only during GC, | |
| 898 // so we cannot allow GC to occur while we're holding this entry. | |
| 899 // We're using a No_Safepoint_Verifier to catch any place where we | |
| 900 // might potentially do a GC at all. | |
| 901 // SystemDictionary::do_unloading() asserts that classes are only | |
| 902 // unloaded at a safepoint. | |
| 903 No_Safepoint_Verifier nosafepoint; | |
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904 return dictionary()->find(d_index, d_hash, class_name, loader_data, |
| 0 | 905 protection_domain, THREAD); |
| 906 } | |
| 907 } | |
| 908 | |
| 909 | |
| 910 // Look for a loaded instance or array klass by name. Do not do any loading. | |
| 911 // return NULL in case of error. | |
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912 Klass* SystemDictionary::find_instance_or_array_klass(Symbol* class_name, |
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913 Handle class_loader, |
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914 Handle protection_domain, |
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915 TRAPS) { |
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916 Klass* k = NULL; |
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917 assert(class_name != NULL, "class name must be non NULL"); |
|
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918 |
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919 if (FieldType::is_array(class_name)) { |
| 0 | 920 // The name refers to an array. Parse the name. |
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921 // dimension and object_key in FieldArrayInfo are assigned as a |
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922 // side-effect of this call |
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923 FieldArrayInfo fd; |
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924 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
| 0 | 925 if (t != T_OBJECT) { |
| 926 k = Universe::typeArrayKlassObj(t); | |
| 927 } else { | |
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928 k = SystemDictionary::find(fd.object_key(), class_loader, protection_domain, THREAD); |
| 0 | 929 } |
| 930 if (k != NULL) { | |
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931 k = Klass::cast(k)->array_klass_or_null(fd.dimension()); |
| 0 | 932 } |
| 933 } else { | |
| 934 k = find(class_name, class_loader, protection_domain, THREAD); | |
| 935 } | |
| 936 return k; | |
| 937 } | |
| 938 | |
| 939 // Note: this method is much like resolve_from_stream, but | |
| 940 // updates no supplemental data structures. | |
| 941 // TODO consolidate the two methods with a helper routine? | |
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942 Klass* SystemDictionary::parse_stream(Symbol* class_name, |
|
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943 Handle class_loader, |
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944 Handle protection_domain, |
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945 ClassFileStream* st, |
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946 KlassHandle host_klass, |
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947 GrowableArray<Handle>* cp_patches, |
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948 TRAPS) { |
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949 TempNewSymbol parsed_name = NULL; |
| 0 | 950 |
| 951 // Parse the stream. Note that we do this even though this klass might | |
| 952 // already be present in the SystemDictionary, otherwise we would not | |
| 953 // throw potential ClassFormatErrors. | |
| 954 // | |
| 955 // Note: "name" is updated. | |
| 956 // Further note: a placeholder will be added for this class when | |
| 957 // super classes are loaded (resolve_super_or_fail). We expect this | |
| 958 // to be called for all classes but java.lang.Object; and we preload | |
| 959 // java.lang.Object through resolve_or_fail, not this path. | |
| 960 | |
| 961 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
| 962 class_loader, | |
| 963 protection_domain, | |
| 710 | 964 host_klass, |
| 965 cp_patches, | |
| 0 | 966 parsed_name, |
|
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967 true, |
| 0 | 968 THREAD); |
| 969 | |
| 970 // We don't redefine the class, so we just need to clean up whether there | |
| 971 // was an error or not (don't want to modify any system dictionary | |
| 972 // data structures). | |
| 973 // Parsed name could be null if we threw an error before we got far | |
| 974 // enough along to parse it -- in that case, there is nothing to clean up. | |
|
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975 if (parsed_name != NULL) { |
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976 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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977 |
| 0 | 978 unsigned int p_hash = placeholders()->compute_hash(parsed_name, |
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979 loader_data); |
| 0 | 980 int p_index = placeholders()->hash_to_index(p_hash); |
| 981 { | |
| 982 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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983 placeholders()->find_and_remove(p_index, p_hash, parsed_name, loader_data, THREAD); |
| 0 | 984 SystemDictionary_lock->notify_all(); |
| 985 } | |
| 986 } | |
| 987 | |
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988 if (host_klass.not_null() && k.not_null()) { |
|
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989 assert(EnableInvokeDynamic, ""); |
|
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990 // If it's anonymous, initialize it now, since nobody else will. |
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991 k->class_loader_data()->record_dependency(host_klass(), CHECK_NULL); |
|
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992 k->set_host_klass(host_klass()); |
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993 |
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994 { |
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995 MutexLocker mu_r(Compile_lock, THREAD); |
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996 |
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997 // Add to class hierarchy, initialize vtables, and do possible |
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998 // deoptimizations. |
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999 add_to_hierarchy(k, CHECK_NULL); // No exception, but can block |
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1000 |
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1001 // But, do not add to system dictionary. |
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1002 } |
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1003 |
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1004 // Rewrite and patch constant pool here. |
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1005 k->link_class(THREAD); |
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1006 if (cp_patches != NULL) { |
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1007 k->constants()->patch_resolved_references(cp_patches); |
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1008 } |
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1009 k->eager_initialize(THREAD); |
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1010 |
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1011 // notify jvmti |
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1012 if (JvmtiExport::should_post_class_load()) { |
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1013 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); |
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1014 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); |
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1015 } |
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1016 } |
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1017 assert(host_klass.not_null() || cp_patches == NULL, |
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1018 "cp_patches only found with host_klass"); |
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1019 |
| 0 | 1020 return k(); |
| 1021 } | |
| 1022 | |
| 1023 // Add a klass to the system from a stream (called by jni_DefineClass and | |
| 1024 // JVM_DefineClass). | |
| 1025 // Note: class_name can be NULL. In that case we do not know the name of | |
| 1026 // the class until we have parsed the stream. | |
| 1027 | |
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1028 Klass* SystemDictionary::resolve_from_stream(Symbol* class_name, |
|
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1029 Handle class_loader, |
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1030 Handle protection_domain, |
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1031 ClassFileStream* st, |
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1032 bool verify, |
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1033 TRAPS) { |
| 0 | 1034 |
| 514 | 1035 // Classloaders that support parallelism, e.g. bootstrap classloader, |
| 1036 // or all classloaders with UnsyncloadClass do not acquire lock here | |
| 1037 bool DoObjectLock = true; | |
| 1038 if (is_parallelCapable(class_loader)) { | |
| 1039 DoObjectLock = false; | |
| 1040 } | |
| 1041 | |
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1042 ClassLoaderData* loader_data = register_loader(class_loader); |
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1043 |
| 514 | 1044 // Make sure we are synchronized on the class loader before we proceed |
| 0 | 1045 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); |
| 1046 check_loader_lock_contention(lockObject, THREAD); | |
| 514 | 1047 ObjectLocker ol(lockObject, THREAD, DoObjectLock); |
| 0 | 1048 |
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1049 TempNewSymbol parsed_name = NULL; |
| 0 | 1050 |
| 1051 // Parse the stream. Note that we do this even though this klass might | |
| 1052 // already be present in the SystemDictionary, otherwise we would not | |
| 1053 // throw potential ClassFormatErrors. | |
| 1054 // | |
| 1055 // Note: "name" is updated. | |
| 1056 // Further note: a placeholder will be added for this class when | |
| 1057 // super classes are loaded (resolve_super_or_fail). We expect this | |
| 1058 // to be called for all classes but java.lang.Object; and we preload | |
| 1059 // java.lang.Object through resolve_or_fail, not this path. | |
| 1060 | |
| 1061 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
| 1062 class_loader, | |
| 1063 protection_domain, | |
| 1064 parsed_name, | |
|
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1065 verify, |
| 0 | 1066 THREAD); |
| 1067 | |
| 1068 const char* pkg = "java/"; | |
| 1069 if (!HAS_PENDING_EXCEPTION && | |
| 1070 !class_loader.is_null() && | |
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1071 parsed_name != NULL && |
| 0 | 1072 !strncmp((const char*)parsed_name->bytes(), pkg, strlen(pkg))) { |
| 1073 // It is illegal to define classes in the "java." package from | |
| 1074 // JVM_DefineClass or jni_DefineClass unless you're the bootclassloader | |
| 1075 ResourceMark rm(THREAD); | |
| 1076 char* name = parsed_name->as_C_string(); | |
| 1077 char* index = strrchr(name, '/'); | |
| 1078 *index = '\0'; // chop to just the package name | |
| 1079 while ((index = strchr(name, '/')) != NULL) { | |
| 1080 *index = '.'; // replace '/' with '.' in package name | |
| 1081 } | |
| 1082 const char* fmt = "Prohibited package name: %s"; | |
| 1083 size_t len = strlen(fmt) + strlen(name); | |
| 1084 char* message = NEW_RESOURCE_ARRAY(char, len); | |
| 1085 jio_snprintf(message, len, fmt, name); | |
| 1086 Exceptions::_throw_msg(THREAD_AND_LOCATION, | |
| 1087 vmSymbols::java_lang_SecurityException(), message); | |
| 1088 } | |
| 1089 | |
| 1090 if (!HAS_PENDING_EXCEPTION) { | |
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1091 assert(parsed_name != NULL, "Sanity"); |
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1092 assert(class_name == NULL || class_name == parsed_name, "name mismatch"); |
| 0 | 1093 // Verification prevents us from creating names with dots in them, this |
| 1094 // asserts that that's the case. | |
| 1095 assert(is_internal_format(parsed_name), | |
| 1096 "external class name format used internally"); | |
| 1097 | |
| 1098 // Add class just loaded | |
| 514 | 1099 // If a class loader supports parallel classloading handle parallel define requests |
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1100 // find_or_define_instance_class may return a different InstanceKlass |
| 514 | 1101 if (is_parallelCapable(class_loader)) { |
| 1102 k = find_or_define_instance_class(class_name, class_loader, k, THREAD); | |
| 1103 } else { | |
| 1104 define_instance_class(k, THREAD); | |
| 1105 } | |
| 0 | 1106 } |
| 1107 | |
| 1108 // If parsing the class file or define_instance_class failed, we | |
| 1109 // need to remove the placeholder added on our behalf. But we | |
| 1110 // must make sure parsed_name is valid first (it won't be if we had | |
| 1111 // a format error before the class was parsed far enough to | |
| 1112 // find the name). | |
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1113 if (HAS_PENDING_EXCEPTION && parsed_name != NULL) { |
| 0 | 1114 unsigned int p_hash = placeholders()->compute_hash(parsed_name, |
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1115 loader_data); |
| 0 | 1116 int p_index = placeholders()->hash_to_index(p_hash); |
| 1117 { | |
| 1118 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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1119 placeholders()->find_and_remove(p_index, p_hash, parsed_name, loader_data, THREAD); |
| 0 | 1120 SystemDictionary_lock->notify_all(); |
| 1121 } | |
| 1122 return NULL; | |
| 1123 } | |
| 1124 | |
| 1125 // Make sure that we didn't leave a place holder in the | |
| 1126 // SystemDictionary; this is only done on success | |
| 1127 debug_only( { | |
| 1128 if (!HAS_PENDING_EXCEPTION) { | |
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1129 assert(parsed_name != NULL, "parsed_name is still null?"); |
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1130 Symbol* h_name = k->name(); |
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1131 ClassLoaderData *defining_loader_data = k->class_loader_data(); |
| 0 | 1132 |
| 1133 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 1134 | |
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1135 Klass* check = find_class(parsed_name, loader_data); |
| 0 | 1136 assert(check == k(), "should be present in the dictionary"); |
| 1137 | |
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1138 Klass* check2 = find_class(h_name, defining_loader_data); |
| 0 | 1139 assert(check == check2, "name inconsistancy in SystemDictionary"); |
| 1140 } | |
| 1141 } ); | |
| 1142 | |
| 1143 return k(); | |
| 1144 } | |
| 1145 | |
| 1146 | |
| 6197 | 1147 void SystemDictionary::set_shared_dictionary(HashtableBucket<mtClass>* t, int length, |
| 0 | 1148 int number_of_entries) { |
| 6197 | 1149 assert(length == _nof_buckets * sizeof(HashtableBucket<mtClass>), |
| 0 | 1150 "bad shared dictionary size."); |
| 1151 _shared_dictionary = new Dictionary(_nof_buckets, t, number_of_entries); | |
| 1152 } | |
| 1153 | |
| 1154 | |
| 1155 // If there is a shared dictionary, then find the entry for the | |
| 1156 // given shared system class, if any. | |
| 1157 | |
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1158 Klass* SystemDictionary::find_shared_class(Symbol* class_name) { |
| 0 | 1159 if (shared_dictionary() != NULL) { |
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1160 unsigned int d_hash = shared_dictionary()->compute_hash(class_name, NULL); |
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1161 int d_index = shared_dictionary()->hash_to_index(d_hash); |
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1162 |
| 0 | 1163 return shared_dictionary()->find_shared_class(d_index, d_hash, class_name); |
| 1164 } else { | |
| 1165 return NULL; | |
| 1166 } | |
| 1167 } | |
| 1168 | |
| 1169 | |
| 1170 // Load a class from the shared spaces (found through the shared system | |
| 1171 // dictionary). Force the superclass and all interfaces to be loaded. | |
| 1172 // Update the class definition to include sibling classes and no | |
| 1173 // subclasses (yet). [Classes in the shared space are not part of the | |
| 1174 // object hierarchy until loaded.] | |
| 1175 | |
| 1176 instanceKlassHandle SystemDictionary::load_shared_class( | |
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1177 Symbol* class_name, Handle class_loader, TRAPS) { |
| 0 | 1178 instanceKlassHandle ik (THREAD, find_shared_class(class_name)); |
| 1179 return load_shared_class(ik, class_loader, THREAD); | |
| 1180 } | |
| 1181 | |
| 1182 // Note well! Changes to this method may affect oop access order | |
| 1183 // in the shared archive. Please take care to not make changes that | |
| 1184 // adversely affect cold start time by changing the oop access order | |
| 1185 // that is specified in dump.cpp MarkAndMoveOrderedReadOnly and | |
| 1186 // MarkAndMoveOrderedReadWrite closures. | |
| 1187 instanceKlassHandle SystemDictionary::load_shared_class( | |
| 1188 instanceKlassHandle ik, Handle class_loader, TRAPS) { | |
| 1189 assert(class_loader.is_null(), "non-null classloader for shared class?"); | |
| 1190 if (ik.not_null()) { | |
| 1191 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1192 Symbol* class_name = ik->name(); |
| 0 | 1193 |
| 1194 // Found the class, now load the superclass and interfaces. If they | |
| 1195 // are shared, add them to the main system dictionary and reset | |
| 1196 // their hierarchy references (supers, subs, and interfaces). | |
| 1197 | |
| 1198 if (ik->super() != NULL) { | |
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1199 Symbol* cn = ik->super()->name(); |
| 0 | 1200 resolve_super_or_fail(class_name, cn, |
| 1201 class_loader, Handle(), true, CHECK_(nh)); | |
| 1202 } | |
| 1203 | |
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1204 Array<Klass*>* interfaces = ik->local_interfaces(); |
| 0 | 1205 int num_interfaces = interfaces->length(); |
| 1206 for (int index = 0; index < num_interfaces; index++) { | |
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1207 Klass* k = interfaces->at(index); |
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1208 |
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1209 // Note: can not use InstanceKlass::cast here because |
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1210 // interfaces' InstanceKlass's C++ vtbls haven't been |
| 0 | 1211 // reinitialized yet (they will be once the interface classes |
| 1212 // are loaded) | |
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1213 Symbol* name = k->name(); |
| 0 | 1214 resolve_super_or_fail(class_name, name, class_loader, Handle(), false, CHECK_(nh)); |
| 1215 } | |
| 1216 | |
| 1217 // Adjust methods to recover missing data. They need addresses for | |
| 1218 // interpreter entry points and their default native method address | |
| 1219 // must be reset. | |
| 1220 | |
| 1221 // Updating methods must be done under a lock so multiple | |
| 1222 // threads don't update these in parallel | |
| 1223 // Shared classes are all currently loaded by the bootstrap | |
| 1224 // classloader, so this will never cause a deadlock on | |
| 1225 // a custom class loader lock. | |
| 1226 | |
| 1227 { | |
| 1228 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
| 1229 check_loader_lock_contention(lockObject, THREAD); | |
| 1230 ObjectLocker ol(lockObject, THREAD, true); | |
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1231 ik->restore_unshareable_info(CHECK_(nh)); |
| 0 | 1232 } |
| 1233 | |
| 1234 if (TraceClassLoading) { | |
| 1235 ResourceMark rm; | |
| 1236 tty->print("[Loaded %s", ik->external_name()); | |
| 1237 tty->print(" from shared objects file"); | |
| 1238 tty->print_cr("]"); | |
| 1239 } | |
| 1240 // notify a class loaded from shared object | |
|
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1241 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(ik()), |
| 0 | 1242 true /* shared class */); |
| 1243 } | |
| 1244 return ik; | |
| 1245 } | |
| 1246 | |
| 1247 #ifdef KERNEL | |
| 1248 // Some classes on the bootstrap class path haven't been installed on the | |
| 1249 // system yet. Call the DownloadManager method to make them appear in the | |
| 1250 // bootstrap class path and try again to load the named class. | |
| 1251 // Note that with delegation class loaders all classes in another loader will | |
| 1252 // first try to call this so it'd better be fast!! | |
| 1253 static instanceKlassHandle download_and_retry_class_load( | |
|
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1254 Symbol* class_name, |
| 0 | 1255 TRAPS) { |
| 1256 | |
|
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1257 Klass* dlm = SystemDictionary::DownloadManager_klass(); |
| 0 | 1258 instanceKlassHandle nk; |
| 1259 | |
| 1260 // If download manager class isn't loaded just return. | |
| 1261 if (dlm == NULL) return nk; | |
| 1262 | |
| 1263 { HandleMark hm(THREAD); | |
| 1264 ResourceMark rm(THREAD); | |
| 1265 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nk)); | |
| 1266 Handle class_string = java_lang_String::externalize_classname(s, CHECK_(nk)); | |
| 1267 | |
| 1268 // return value | |
| 1269 JavaValue result(T_OBJECT); | |
| 1270 | |
| 1271 // Call the DownloadManager. We assume that it has a lock because | |
| 1272 // multiple classes could be not found and downloaded at the same time. | |
| 1273 // class sun.misc.DownloadManager; | |
| 1274 // public static String getBootClassPathEntryForClass(String className); | |
| 1275 JavaCalls::call_static(&result, | |
| 1276 KlassHandle(THREAD, dlm), | |
|
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1277 vmSymbols::getBootClassPathEntryForClass_name(), |
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1278 vmSymbols::string_string_signature(), |
| 0 | 1279 class_string, |
| 1280 CHECK_(nk)); | |
| 1281 | |
| 1282 // Get result.string and add to bootclasspath | |
| 1283 assert(result.get_type() == T_OBJECT, "just checking"); | |
| 1284 oop obj = (oop) result.get_jobject(); | |
| 1285 if (obj == NULL) { return nk; } | |
| 1286 | |
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1287 Handle h_obj(THREAD, obj); |
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1288 char* new_class_name = java_lang_String::as_platform_dependent_str(h_obj, |
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1289 CHECK_(nk)); |
| 0 | 1290 |
| 1291 // lock the loader | |
| 1292 // we use this lock because JVMTI does. | |
| 1293 Handle loader_lock(THREAD, SystemDictionary::system_loader_lock()); | |
| 1294 | |
| 1295 ObjectLocker ol(loader_lock, THREAD); | |
| 1296 // add the file to the bootclasspath | |
| 1297 ClassLoader::update_class_path_entry_list(new_class_name, true); | |
| 1298 } // end HandleMark | |
| 1299 | |
| 1300 if (TraceClassLoading) { | |
| 1301 ClassLoader::print_bootclasspath(); | |
| 1302 } | |
| 1303 return ClassLoader::load_classfile(class_name, CHECK_(nk)); | |
| 1304 } | |
| 1305 #endif // KERNEL | |
| 1306 | |
| 1307 | |
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1308 instanceKlassHandle SystemDictionary::load_instance_class(Symbol* class_name, Handle class_loader, TRAPS) { |
| 0 | 1309 instanceKlassHandle nh = instanceKlassHandle(); // null Handle |
| 1310 if (class_loader.is_null()) { | |
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1311 |
| 0 | 1312 // Search the shared system dictionary for classes preloaded into the |
| 1313 // shared spaces. | |
| 1314 instanceKlassHandle k; | |
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1315 { |
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1316 PerfTraceTime vmtimer(ClassLoader::perf_shared_classload_time()); |
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1317 k = load_shared_class(class_name, class_loader, THREAD); |
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1318 } |
| 0 | 1319 |
| 1320 if (k.is_null()) { | |
| 1321 // Use VM class loader | |
|
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1322 PerfTraceTime vmtimer(ClassLoader::perf_sys_classload_time()); |
| 0 | 1323 k = ClassLoader::load_classfile(class_name, CHECK_(nh)); |
| 1324 } | |
| 1325 | |
| 1326 #ifdef KERNEL | |
| 1327 // If the VM class loader has failed to load the class, call the | |
| 1328 // DownloadManager class to make it magically appear on the classpath | |
| 1329 // and try again. This is only configured with the Kernel VM. | |
| 1330 if (k.is_null()) { | |
| 1331 k = download_and_retry_class_load(class_name, CHECK_(nh)); | |
| 1332 } | |
| 1333 #endif // KERNEL | |
| 1334 | |
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1335 // find_or_define_instance_class may return a different InstanceKlass |
| 0 | 1336 if (!k.is_null()) { |
| 1337 k = find_or_define_instance_class(class_name, class_loader, k, CHECK_(nh)); | |
| 1338 } | |
| 1339 return k; | |
| 1340 } else { | |
| 1341 // Use user specified class loader to load class. Call loadClass operation on class_loader. | |
| 1342 ResourceMark rm(THREAD); | |
| 1343 | |
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1344 assert(THREAD->is_Java_thread(), "must be a JavaThread"); |
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1345 JavaThread* jt = (JavaThread*) THREAD; |
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1346 |
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1347 PerfClassTraceTime vmtimer(ClassLoader::perf_app_classload_time(), |
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1348 ClassLoader::perf_app_classload_selftime(), |
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1349 ClassLoader::perf_app_classload_count(), |
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1350 jt->get_thread_stat()->perf_recursion_counts_addr(), |
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1351 jt->get_thread_stat()->perf_timers_addr(), |
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1352 PerfClassTraceTime::CLASS_LOAD); |
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1353 |
| 0 | 1354 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nh)); |
| 1355 // Translate to external class name format, i.e., convert '/' chars to '.' | |
| 1356 Handle string = java_lang_String::externalize_classname(s, CHECK_(nh)); | |
| 1357 | |
| 1358 JavaValue result(T_OBJECT); | |
| 1359 | |
| 1142 | 1360 KlassHandle spec_klass (THREAD, SystemDictionary::ClassLoader_klass()); |
| 0 | 1361 |
| 514 | 1362 // Call public unsynchronized loadClass(String) directly for all class loaders |
| 1363 // for parallelCapable class loaders. JDK >=7, loadClass(String, boolean) will | |
| 1364 // acquire a class-name based lock rather than the class loader object lock. | |
| 1365 // JDK < 7 already acquire the class loader lock in loadClass(String, boolean), | |
| 1366 // so the call to loadClassInternal() was not required. | |
| 1367 // | |
| 1368 // UnsyncloadClass flag means both call loadClass(String) and do | |
| 1369 // not acquire the class loader lock even for class loaders that are | |
| 1370 // not parallelCapable. This was a risky transitional | |
| 1371 // flag for diagnostic purposes only. It is risky to call | |
| 0 | 1372 // custom class loaders without synchronization. |
| 1373 // WARNING If a custom class loader does NOT synchronizer findClass, or callers of | |
| 514 | 1374 // findClass, the UnsyncloadClass flag risks unexpected timing bugs in the field. |
| 0 | 1375 // Do NOT assume this will be supported in future releases. |
| 514 | 1376 // |
| 1377 // Added MustCallLoadClassInternal in case we discover in the field | |
| 1378 // a customer that counts on this call | |
| 1379 if (MustCallLoadClassInternal && has_loadClassInternal()) { | |
| 0 | 1380 JavaCalls::call_special(&result, |
| 1381 class_loader, | |
| 1382 spec_klass, | |
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1383 vmSymbols::loadClassInternal_name(), |
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1384 vmSymbols::string_class_signature(), |
| 0 | 1385 string, |
| 1386 CHECK_(nh)); | |
| 1387 } else { | |
| 1388 JavaCalls::call_virtual(&result, | |
| 1389 class_loader, | |
| 1390 spec_klass, | |
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1391 vmSymbols::loadClass_name(), |
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1392 vmSymbols::string_class_signature(), |
| 0 | 1393 string, |
| 1394 CHECK_(nh)); | |
| 1395 } | |
| 1396 | |
| 1397 assert(result.get_type() == T_OBJECT, "just checking"); | |
| 1398 oop obj = (oop) result.get_jobject(); | |
| 1399 | |
| 1400 // Primitive classes return null since forName() can not be | |
| 1401 // used to obtain any of the Class objects representing primitives or void | |
| 1402 if ((obj != NULL) && !(java_lang_Class::is_primitive(obj))) { | |
| 1403 instanceKlassHandle k = | |
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1404 instanceKlassHandle(THREAD, java_lang_Class::as_Klass(obj)); |
| 0 | 1405 // For user defined Java class loaders, check that the name returned is |
| 1406 // the same as that requested. This check is done for the bootstrap | |
| 1407 // loader when parsing the class file. | |
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1408 if (class_name == k->name()) { |
| 0 | 1409 return k; |
| 1410 } | |
| 1411 } | |
| 1412 // Class is not found or has the wrong name, return NULL | |
| 1413 return nh; | |
| 1414 } | |
| 1415 } | |
| 1416 | |
| 1417 void SystemDictionary::define_instance_class(instanceKlassHandle k, TRAPS) { | |
| 1418 | |
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1419 ClassLoaderData* loader_data = k->class_loader_data(); |
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1420 Handle class_loader_h(THREAD, loader_data->class_loader()); |
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1421 |
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1422 for (uintx it = 0; it < GCExpandToAllocateDelayMillis; it++){} |
| 0 | 1423 |
| 514 | 1424 // for bootstrap and other parallel classloaders don't acquire lock, |
| 1425 // use placeholder token | |
| 1426 // If a parallelCapable class loader calls define_instance_class instead of | |
| 1427 // find_or_define_instance_class to get here, we have a timing | |
| 1428 // hole with systemDictionary updates and check_constraints | |
| 1429 if (!class_loader_h.is_null() && !is_parallelCapable(class_loader_h)) { | |
| 0 | 1430 assert(ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, |
| 1431 compute_loader_lock_object(class_loader_h, THREAD)), | |
| 1432 "define called without lock"); | |
| 1433 } | |
| 1434 | |
| 1435 // Check class-loading constraints. Throw exception if violation is detected. | |
| 1436 // Grabs and releases SystemDictionary_lock | |
| 1437 // The check_constraints/find_class call and update_dictionary sequence | |
| 1438 // must be "atomic" for a specific class/classloader pair so we never | |
| 1439 // define two different instanceKlasses for that class/classloader pair. | |
| 1440 // Existing classloaders will call define_instance_class with the | |
| 1441 // classloader lock held | |
| 1442 // Parallel classloaders will call find_or_define_instance_class | |
| 1443 // which will require a token to perform the define class | |
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1444 Symbol* name_h = k->name(); |
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1445 unsigned int d_hash = dictionary()->compute_hash(name_h, loader_data); |
| 0 | 1446 int d_index = dictionary()->hash_to_index(d_hash); |
| 1447 check_constraints(d_index, d_hash, k, class_loader_h, true, CHECK); | |
| 1448 | |
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1449 // Register class just loaded with class loader (placed in Vector) |
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1450 // Note we do this before updating the dictionary, as this can |
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1451 // fail with an OutOfMemoryError (if it does, we will *not* put this |
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1452 // class in the dictionary and will not update the class hierarchy). |
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1453 // JVMTI FollowReferences needs to find the classes this way. |
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1454 if (k->class_loader() != NULL) { |
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1455 methodHandle m(THREAD, Universe::loader_addClass_method()); |
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1456 JavaValue result(T_VOID); |
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1457 JavaCallArguments args(class_loader_h); |
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1458 args.push_oop(Handle(THREAD, k->java_mirror())); |
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1459 JavaCalls::call(&result, m, &args, CHECK); |
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1460 } |
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1461 |
| 0 | 1462 // Add the new class. We need recompile lock during update of CHA. |
| 1463 { | |
|
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1464 unsigned int p_hash = placeholders()->compute_hash(name_h, loader_data); |
| 0 | 1465 int p_index = placeholders()->hash_to_index(p_hash); |
| 1466 | |
| 1467 MutexLocker mu_r(Compile_lock, THREAD); | |
| 1468 | |
| 1469 // Add to class hierarchy, initialize vtables, and do possible | |
| 1470 // deoptimizations. | |
| 1471 add_to_hierarchy(k, CHECK); // No exception, but can block | |
| 1472 | |
| 1473 // Add to systemDictionary - so other classes can see it. | |
| 1474 // Grabs and releases SystemDictionary_lock | |
| 1475 update_dictionary(d_index, d_hash, p_index, p_hash, | |
| 1476 k, class_loader_h, THREAD); | |
| 1477 } | |
| 1478 k->eager_initialize(THREAD); | |
| 1479 | |
| 1480 // notify jvmti | |
| 1481 if (JvmtiExport::should_post_class_load()) { | |
| 1482 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); | |
| 1483 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); | |
| 1484 | |
| 1485 } | |
| 1486 } | |
| 1487 | |
| 1488 // Support parallel classloading | |
|
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1489 // All parallel class loaders, including bootstrap classloader |
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1490 // lock a placeholder entry for this class/class_loader pair |
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1491 // to allow parallel defines of different classes for this class loader |
| 514 | 1492 // With AllowParallelDefine flag==true, in case they do not synchronize around |
| 1493 // FindLoadedClass/DefineClass, calls, we check for parallel | |
| 0 | 1494 // loading for them, wait if a defineClass is in progress |
| 1495 // and return the initial requestor's results | |
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1496 // This flag does not apply to the bootstrap classloader. |
| 514 | 1497 // With AllowParallelDefine flag==false, call through to define_instance_class |
| 1498 // which will throw LinkageError: duplicate class definition. | |
|
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1499 // False is the requested default. |
| 0 | 1500 // For better performance, the class loaders should synchronize |
| 514 | 1501 // findClass(), i.e. FindLoadedClass/DefineClassIfAbsent or they |
| 0 | 1502 // potentially waste time reading and parsing the bytestream. |
| 1503 // Note: VM callers should ensure consistency of k/class_name,class_loader | |
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1504 instanceKlassHandle SystemDictionary::find_or_define_instance_class(Symbol* class_name, Handle class_loader, instanceKlassHandle k, TRAPS) { |
| 0 | 1505 |
| 1506 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1507 Symbol* name_h = k->name(); // passed in class_name may be null |
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1508 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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1509 |
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1510 unsigned int d_hash = dictionary()->compute_hash(name_h, loader_data); |
| 0 | 1511 int d_index = dictionary()->hash_to_index(d_hash); |
| 1512 | |
| 1513 // Hold SD lock around find_class and placeholder creation for DEFINE_CLASS | |
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1514 unsigned int p_hash = placeholders()->compute_hash(name_h, loader_data); |
| 0 | 1515 int p_index = placeholders()->hash_to_index(p_hash); |
| 1516 PlaceholderEntry* probe; | |
| 1517 | |
| 1518 { | |
| 1519 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 1520 // First check if class already defined | |
|
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1521 if (UnsyncloadClass || (is_parallelDefine(class_loader))) { |
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1522 Klass* check = find_class(d_index, d_hash, name_h, loader_data); |
|
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1523 if (check != NULL) { |
|
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1524 return(instanceKlassHandle(THREAD, check)); |
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1525 } |
| 0 | 1526 } |
| 1527 | |
| 1528 // Acquire define token for this class/classloader | |
|
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1529 probe = placeholders()->find_and_add(p_index, p_hash, name_h, loader_data, PlaceholderTable::DEFINE_CLASS, NULL, THREAD); |
| 514 | 1530 // Wait if another thread defining in parallel |
| 1531 // All threads wait - even those that will throw duplicate class: otherwise | |
| 1532 // caller is surprised by LinkageError: duplicate, but findLoadedClass fails | |
| 1533 // if other thread has not finished updating dictionary | |
| 1534 while (probe->definer() != NULL) { | |
| 1535 SystemDictionary_lock->wait(); | |
| 1536 } | |
| 1537 // Only special cases allow parallel defines and can use other thread's results | |
| 1538 // Other cases fall through, and may run into duplicate defines | |
| 1539 // caught by finding an entry in the SystemDictionary | |
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1540 if ((UnsyncloadClass || is_parallelDefine(class_loader)) && (probe->InstanceKlass() != NULL)) { |
| 0 | 1541 probe->remove_seen_thread(THREAD, PlaceholderTable::DEFINE_CLASS); |
|
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1542 placeholders()->find_and_remove(p_index, p_hash, name_h, loader_data, THREAD); |
| 514 | 1543 SystemDictionary_lock->notify_all(); |
| 0 | 1544 #ifdef ASSERT |
|
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1545 Klass* check = find_class(d_index, d_hash, name_h, loader_data); |
| 514 | 1546 assert(check != NULL, "definer missed recording success"); |
| 0 | 1547 #endif |
|
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1548 return(instanceKlassHandle(THREAD, probe->InstanceKlass())); |
| 0 | 1549 } else { |
| 514 | 1550 // This thread will define the class (even if earlier thread tried and had an error) |
| 1551 probe->set_definer(THREAD); | |
| 0 | 1552 } |
| 1553 } | |
| 1554 | |
| 1555 define_instance_class(k, THREAD); | |
| 1556 | |
| 1557 Handle linkage_exception = Handle(); // null handle | |
| 1558 | |
| 1559 // definer must notify any waiting threads | |
| 1560 { | |
| 1561 MutexLocker mu(SystemDictionary_lock, THREAD); | |
|
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1562 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name_h, loader_data); |
| 0 | 1563 assert(probe != NULL, "DEFINE_CLASS placeholder lost?"); |
| 1564 if (probe != NULL) { | |
| 1565 if (HAS_PENDING_EXCEPTION) { | |
| 1566 linkage_exception = Handle(THREAD,PENDING_EXCEPTION); | |
| 1567 CLEAR_PENDING_EXCEPTION; | |
| 1568 } else { | |
| 1569 probe->set_instanceKlass(k()); | |
| 1570 } | |
| 1571 probe->set_definer(NULL); | |
| 1572 probe->remove_seen_thread(THREAD, PlaceholderTable::DEFINE_CLASS); | |
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1573 placeholders()->find_and_remove(p_index, p_hash, name_h, loader_data, THREAD); |
| 0 | 1574 SystemDictionary_lock->notify_all(); |
| 1575 } | |
| 1576 } | |
| 1577 | |
| 1578 // Can't throw exception while holding lock due to rank ordering | |
| 1579 if (linkage_exception() != NULL) { | |
| 1580 THROW_OOP_(linkage_exception(), nh); // throws exception and returns | |
| 1581 } | |
| 1582 | |
| 1583 return k; | |
| 1584 } | |
| 1585 Handle SystemDictionary::compute_loader_lock_object(Handle class_loader, TRAPS) { | |
| 1586 // If class_loader is NULL we synchronize on _system_loader_lock_obj | |
| 1587 if (class_loader.is_null()) { | |
| 1588 return Handle(THREAD, _system_loader_lock_obj); | |
| 1589 } else { | |
| 1590 return class_loader; | |
| 1591 } | |
| 1592 } | |
| 1593 | |
| 1594 // This method is added to check how often we have to wait to grab loader | |
| 1595 // lock. The results are being recorded in the performance counters defined in | |
| 1596 // ClassLoader::_sync_systemLoaderLockContentionRate and | |
| 1597 // ClassLoader::_sync_nonSystemLoaderLockConteionRate. | |
| 1598 void SystemDictionary::check_loader_lock_contention(Handle loader_lock, TRAPS) { | |
| 1599 if (!UsePerfData) { | |
| 1600 return; | |
| 1601 } | |
| 1602 | |
| 1603 assert(!loader_lock.is_null(), "NULL lock object"); | |
| 1604 | |
| 1605 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader_lock) | |
| 1606 == ObjectSynchronizer::owner_other) { | |
| 1607 // contention will likely happen, so increment the corresponding | |
| 1608 // contention counter. | |
| 1609 if (loader_lock() == _system_loader_lock_obj) { | |
| 1610 ClassLoader::sync_systemLoaderLockContentionRate()->inc(); | |
| 1611 } else { | |
| 1612 ClassLoader::sync_nonSystemLoaderLockContentionRate()->inc(); | |
| 1613 } | |
| 1614 } | |
| 1615 } | |
| 1616 | |
| 1617 // ---------------------------------------------------------------------------- | |
| 1618 // Lookup | |
| 1619 | |
|
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1620 Klass* SystemDictionary::find_class(int index, unsigned int hash, |
|
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1621 Symbol* class_name, |
|
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1622 ClassLoaderData* loader_data) { |
| 0 | 1623 assert_locked_or_safepoint(SystemDictionary_lock); |
|
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1624 assert (index == dictionary()->index_for(class_name, loader_data), |
| 0 | 1625 "incorrect index?"); |
| 1626 | |
|
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1627 Klass* k = dictionary()->find_class(index, hash, class_name, loader_data); |
| 0 | 1628 return k; |
| 1629 } | |
| 1630 | |
| 1631 | |
| 1632 // Basic find on classes in the midst of being loaded | |
|
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1633 Symbol* SystemDictionary::find_placeholder(Symbol* class_name, |
|
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1634 ClassLoaderData* loader_data) { |
| 0 | 1635 assert_locked_or_safepoint(SystemDictionary_lock); |
|
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1636 unsigned int p_hash = placeholders()->compute_hash(class_name, loader_data); |
|
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1637 int p_index = placeholders()->hash_to_index(p_hash); |
|
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1638 return placeholders()->find_entry(p_index, p_hash, class_name, loader_data); |
| 0 | 1639 } |
| 1640 | |
| 1641 | |
| 1642 // Used for assertions and verification only | |
|
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1643 Klass* SystemDictionary::find_class(Symbol* class_name, ClassLoaderData* loader_data) { |
| 0 | 1644 #ifndef ASSERT |
| 1645 guarantee(VerifyBeforeGC || | |
| 1646 VerifyDuringGC || | |
| 1647 VerifyBeforeExit || | |
| 1648 VerifyAfterGC, "too expensive"); | |
| 1649 #endif | |
| 1650 assert_locked_or_safepoint(SystemDictionary_lock); | |
| 1651 | |
| 1652 // First look in the loaded class array | |
|
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1653 unsigned int d_hash = dictionary()->compute_hash(class_name, loader_data); |
| 0 | 1654 int d_index = dictionary()->hash_to_index(d_hash); |
|
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1655 return find_class(d_index, d_hash, class_name, loader_data); |
| 0 | 1656 } |
| 1657 | |
| 1658 | |
| 1659 // Get the next class in the diictionary. | |
|
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1660 Klass* SystemDictionary::try_get_next_class() { |
| 0 | 1661 return dictionary()->try_get_next_class(); |
| 1662 } | |
| 1663 | |
| 1664 | |
| 1665 // ---------------------------------------------------------------------------- | |
| 1666 // Update hierachy. This is done before the new klass has been added to the SystemDictionary. The Recompile_lock | |
| 1667 // is held, to ensure that the compiler is not using the class hierachy, and that deoptimization will kick in | |
| 1668 // before a new class is used. | |
| 1669 | |
| 1670 void SystemDictionary::add_to_hierarchy(instanceKlassHandle k, TRAPS) { | |
| 1671 assert(k.not_null(), "just checking"); | |
|
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|
1672 assert_locked_or_safepoint(Compile_lock); |
|
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|
1673 |
| 0 | 1674 // Link into hierachy. Make sure the vtables are initialized before linking into |
| 1675 k->append_to_sibling_list(); // add to superklass/sibling list | |
| 1676 k->process_interfaces(THREAD); // handle all "implements" declarations | |
|
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1677 k->set_init_state(InstanceKlass::loaded); |
| 0 | 1678 // Now flush all code that depended on old class hierarchy. |
| 1679 // Note: must be done *after* linking k into the hierarchy (was bug 12/9/97) | |
| 1680 // Also, first reinitialize vtable because it may have gotten out of synch | |
| 1681 // while the new class wasn't connected to the class hierarchy. | |
| 1682 Universe::flush_dependents_on(k); | |
| 1683 } | |
| 1684 | |
| 1685 | |
| 1686 // ---------------------------------------------------------------------------- | |
| 1687 // GC support | |
| 1688 | |
| 1689 // Following roots during mark-sweep is separated in two phases. | |
| 1690 // | |
| 1691 // The first phase follows preloaded classes and all other system | |
| 1692 // classes, since these will never get unloaded anyway. | |
| 1693 // | |
| 1694 // The second phase removes (unloads) unreachable classes from the | |
| 1695 // system dictionary and follows the remaining classes' contents. | |
| 1696 | |
| 1697 void SystemDictionary::always_strong_oops_do(OopClosure* blk) { | |
| 1698 blk->do_oop(&_java_system_loader); | |
|
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1699 blk->do_oop(&_system_loader_lock_obj); |
|
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1700 |
|
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1701 dictionary()->always_strong_oops_do(blk); |
|
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|
1702 |
|
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|
1703 // Visit extra methods |
|
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|
1704 invoke_method_table()->oops_do(blk); |
| 0 | 1705 } |
| 1706 | |
|
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1707 void SystemDictionary::always_strong_classes_do(KlassClosure* closure) { |
| 0 | 1708 // Follow all system classes and temporary placeholders in dictionary |
|
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1709 dictionary()->always_strong_classes_do(closure); |
|
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1710 |
|
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|
1711 // Placeholders. These represent classes we're actively loading. |
|
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1712 placeholders()->classes_do(closure); |
| 0 | 1713 } |
| 1714 | |
|
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|
1715 // Calculate a "good" systemdictionary size based |
|
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1716 // on predicted or current loaded classes count |
|
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|
1717 int SystemDictionary::calculate_systemdictionary_size(int classcount) { |
|
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1718 int newsize = _old_default_sdsize; |
|
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1719 if ((classcount > 0) && !DumpSharedSpaces) { |
|
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1720 int desiredsize = classcount/_average_depth_goal; |
|
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1721 for (newsize = _primelist[_sdgeneration]; _sdgeneration < _prime_array_size -1; |
|
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1722 newsize = _primelist[++_sdgeneration]) { |
|
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|
1723 if (desiredsize <= newsize) { |
|
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|
1724 break; |
|
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|
1725 } |
|
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|
1726 } |
|
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|
1727 } |
|
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|
1728 return newsize; |
|
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|
1729 } |
| 0 | 1730 bool SystemDictionary::do_unloading(BoolObjectClosure* is_alive) { |
|
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1731 // First, mark for unload all ClassLoaderData referencing a dead class loader. |
|
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1732 bool has_dead_loaders = ClassLoaderDataGraph::do_unloading(is_alive); |
|
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1733 bool unloading_occurred = false; |
|
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1734 if (has_dead_loaders) { |
|
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1735 unloading_occurred = dictionary()->do_unloading(); |
|
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1736 constraints()->purge_loader_constraints(); |
|
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1737 resolution_errors()->purge_resolution_errors(); |
| 0 | 1738 } |
|
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1739 return unloading_occurred; |
|
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1740 } |
|
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|
1741 |
| 0 | 1742 void SystemDictionary::oops_do(OopClosure* f) { |
| 1743 f->do_oop(&_java_system_loader); | |
|
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1744 f->do_oop(&_system_loader_lock_obj); |
| 0 | 1745 |
| 1746 // Adjust dictionary | |
| 1747 dictionary()->oops_do(f); | |
| 1748 | |
| 710 | 1749 // Visit extra methods |
| 1903 | 1750 invoke_method_table()->oops_do(f); |
| 0 | 1751 } |
| 1752 | |
|
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1753 // Extended Class redefinition support. |
|
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1754 // If one of these classes is replaced, we need to replace it in these places. |
|
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1755 // KlassClosure::do_klass should take the address of a class but we can |
|
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|
1756 // change that later. |
|
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1757 void SystemDictionary::preloaded_classes_do(KlassClosure* f) { |
|
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|
1758 for (int k = (int)FIRST_WKID; k < (int)WKID_LIMIT; k++) { |
|
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1759 f->do_klass(_well_known_klasses[k]); |
|
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|
1760 } |
| 0 | 1761 |
| 1762 { | |
| 1763 for (int i = 0; i < T_VOID+1; i++) { | |
| 1764 if (_box_klasses[i] != NULL) { | |
| 1765 assert(i >= T_BOOLEAN, "checking"); | |
|
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1766 f->do_klass(_box_klasses[i]); |
| 0 | 1767 } |
| 1768 } | |
| 1769 } | |
| 1770 | |
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1771 FilteredFieldsMap::classes_do(f); |
| 0 | 1772 } |
| 1773 | |
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1774 void SystemDictionary::lazily_loaded_classes_do(KlassClosure* f) { |
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1775 f->do_klass(_abstract_ownable_synchronizer_klass); |
| 0 | 1776 } |
| 1777 | |
| 1778 // Just the classes from defining class loaders | |
| 1779 // Don't iterate over placeholders | |
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1780 void SystemDictionary::classes_do(void f(Klass*)) { |
| 0 | 1781 dictionary()->classes_do(f); |
| 1782 } | |
| 1783 | |
| 1784 // Added for initialize_itable_for_klass | |
| 1785 // Just the classes from defining class loaders | |
| 1786 // Don't iterate over placeholders | |
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1787 void SystemDictionary::classes_do(void f(Klass*, TRAPS), TRAPS) { |
| 0 | 1788 dictionary()->classes_do(f, CHECK); |
| 1789 } | |
| 1790 | |
| 1791 // All classes, and their class loaders | |
| 1792 // Don't iterate over placeholders | |
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1793 void SystemDictionary::classes_do(void f(Klass*, ClassLoaderData*)) { |
| 0 | 1794 dictionary()->classes_do(f); |
| 1795 } | |
| 1796 | |
| 1797 // All classes, and their class loaders | |
| 1798 // (added for helpers that use HandleMarks and ResourceMarks) | |
| 1799 // Don't iterate over placeholders | |
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1800 void SystemDictionary::classes_do(void f(Klass*, ClassLoaderData*, TRAPS), TRAPS) { |
| 0 | 1801 dictionary()->classes_do(f, CHECK); |
| 1802 } | |
| 1803 | |
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1804 void SystemDictionary::placeholders_do(void f(Symbol*)) { |
| 0 | 1805 placeholders()->entries_do(f); |
| 1806 } | |
| 1807 | |
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1808 void SystemDictionary::methods_do(void f(Method*)) { |
| 0 | 1809 dictionary()->methods_do(f); |
| 1903 | 1810 invoke_method_table()->methods_do(f); |
| 0 | 1811 } |
| 1812 | |
| 1813 // ---------------------------------------------------------------------------- | |
| 1814 // Lazily load klasses | |
| 1815 | |
| 1816 void SystemDictionary::load_abstract_ownable_synchronizer_klass(TRAPS) { | |
| 1817 assert(JDK_Version::is_gte_jdk16x_version(), "Must be JDK 1.6 or later"); | |
| 1818 | |
| 1819 // if multiple threads calling this function, only one thread will load | |
| 1820 // the class. The other threads will find the loaded version once the | |
| 1821 // class is loaded. | |
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1822 Klass* aos = _abstract_ownable_synchronizer_klass; |
| 0 | 1823 if (aos == NULL) { |
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1824 Klass* k = resolve_or_fail(vmSymbols::java_util_concurrent_locks_AbstractOwnableSynchronizer(), true, CHECK); |
| 0 | 1825 // Force a fence to prevent any read before the write completes |
| 1826 OrderAccess::fence(); | |
| 1827 _abstract_ownable_synchronizer_klass = k; | |
| 1828 } | |
| 1829 } | |
| 1830 | |
| 1831 // ---------------------------------------------------------------------------- | |
| 1832 // Initialization | |
| 1833 | |
| 1834 void SystemDictionary::initialize(TRAPS) { | |
| 1835 // Allocate arrays | |
| 1836 assert(dictionary() == NULL, | |
| 1837 "SystemDictionary should only be initialized once"); | |
|
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1838 _sdgeneration = 0; |
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1839 _dictionary = new Dictionary(calculate_systemdictionary_size(PredictedLoadedClassCount)); |
| 1903 | 1840 _placeholders = new PlaceholderTable(_nof_buckets); |
| 0 | 1841 _number_of_modifications = 0; |
| 1903 | 1842 _loader_constraints = new LoaderConstraintTable(_loader_constraint_size); |
| 1843 _resolution_errors = new ResolutionErrorTable(_resolution_error_size); | |
| 1844 _invoke_method_table = new SymbolPropertyTable(_invoke_method_size); | |
| 0 | 1845 |
| 1846 // Allocate private object used as system class loader lock | |
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1847 _system_loader_lock_obj = oopFactory::new_intArray(0, CHECK); |
| 0 | 1848 // Initialize basic classes |
| 1849 initialize_preloaded_classes(CHECK); | |
| 1850 } | |
| 1851 | |
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1852 // Compact table of directions on the initialization of klasses: |
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1853 static const short wk_init_info[] = { |
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1854 #define WK_KLASS_INIT_INFO(name, symbol, option) \ |
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1855 ( ((int)vmSymbols::VM_SYMBOL_ENUM_NAME(symbol) \ |
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1856 << SystemDictionary::CEIL_LG_OPTION_LIMIT) \ |
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1857 | (int)SystemDictionary::option ), |
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1858 WK_KLASSES_DO(WK_KLASS_INIT_INFO) |
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1859 #undef WK_KLASS_INIT_INFO |
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1860 0 |
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1861 }; |
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1862 |
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1863 bool SystemDictionary::initialize_wk_klass(WKID id, int init_opt, TRAPS) { |
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1864 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1865 int info = wk_init_info[id - FIRST_WKID]; |
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1866 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
|
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1867 Symbol* symbol = vmSymbols::symbol_at((vmSymbols::SID)sid); |
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1868 Klass** klassp = &_well_known_klasses[id]; |
| 2460 | 1869 bool must_load = (init_opt < SystemDictionary::Opt); |
| 1870 bool try_load = true; | |
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1871 if (init_opt == SystemDictionary::Opt_Kernel) { |
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1872 #ifndef KERNEL |
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1873 try_load = false; |
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1874 #endif //KERNEL |
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1875 } |
| 2460 | 1876 if ((*klassp) == NULL && try_load) { |
|
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1877 if (must_load) { |
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1878 (*klassp) = resolve_or_fail(symbol, true, CHECK_0); // load required class |
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1879 } else { |
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1880 (*klassp) = resolve_or_null(symbol, CHECK_0); // load optional klass |
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1881 } |
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1882 } |
| 2460 | 1883 return ((*klassp) != NULL); |
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1884 } |
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1885 |
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1886 void SystemDictionary::initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS) { |
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1887 assert((int)start_id <= (int)limit_id, "IDs are out of order!"); |
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1888 for (int id = (int)start_id; id < (int)limit_id; id++) { |
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1889 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1890 int info = wk_init_info[id - FIRST_WKID]; |
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1891 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1892 int opt = (info & right_n_bits(CEIL_LG_OPTION_LIMIT)); |
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1893 |
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1894 initialize_wk_klass((WKID)id, opt, CHECK); |
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1895 } |
| 710 | 1896 |
| 1897 // move the starting value forward to the limit: | |
| 1898 start_id = limit_id; | |
|
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1899 } |
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1900 |
| 0 | 1901 void SystemDictionary::initialize_preloaded_classes(TRAPS) { |
| 1142 | 1902 assert(WK_KLASS(Object_klass) == NULL, "preloaded classes should only be initialized once"); |
| 0 | 1903 // Preload commonly used klasses |
|
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1904 WKID scan = FIRST_WKID; |
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1905 // first do Object, then String, Class |
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1906 if (UseSharedSpaces) { |
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1907 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Object_klass), scan, CHECK); |
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1908 // Initialize the constant pool for the Object_class |
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1909 InstanceKlass* ik = InstanceKlass::cast(Object_klass()); |
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1910 ik->constants()->restore_unshareable_info(CHECK); |
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1911 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Class_klass), scan, CHECK); |
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1912 } else { |
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1913 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Class_klass), scan, CHECK); |
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1914 } |
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1915 |
| 6057 | 1916 // Calculate offsets for String and Class classes since they are loaded and |
| 1917 // can be used after this point. | |
| 1918 java_lang_String::compute_offsets(); | |
| 3938 | 1919 java_lang_Class::compute_offsets(); |
|
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1920 |
| 0 | 1921 // Fixup mirrors for classes loaded before java.lang.Class. |
| 1922 // These calls iterate over the objects currently in the perm gen | |
| 1923 // so calling them at this point is matters (not before when there | |
| 1924 // are fewer objects and not later after there are more objects | |
| 1925 // in the perm gen. | |
| 1926 Universe::initialize_basic_type_mirrors(CHECK); | |
| 1927 Universe::fixup_mirrors(CHECK); | |
| 1928 | |
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1929 // do a bunch more: |
| 1142 | 1930 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Reference_klass), scan, CHECK); |
| 0 | 1931 |
| 1932 // Preload ref klasses and set reference types | |
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1933 InstanceKlass::cast(WK_KLASS(Reference_klass))->set_reference_type(REF_OTHER); |
|
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1934 InstanceRefKlass::update_nonstatic_oop_maps(WK_KLASS(Reference_klass)); |
| 0 | 1935 |
| 1142 | 1936 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(PhantomReference_klass), scan, CHECK); |
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1937 InstanceKlass::cast(WK_KLASS(SoftReference_klass))->set_reference_type(REF_SOFT); |
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1938 InstanceKlass::cast(WK_KLASS(WeakReference_klass))->set_reference_type(REF_WEAK); |
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1939 InstanceKlass::cast(WK_KLASS(FinalReference_klass))->set_reference_type(REF_FINAL); |
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1940 InstanceKlass::cast(WK_KLASS(PhantomReference_klass))->set_reference_type(REF_PHANTOM); |
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1941 |
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1942 // JSR 292 classes |
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1943 WKID jsr292_group_start = WK_KLASS_ENUM_NAME(MethodHandle_klass); |
|
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1944 WKID jsr292_group_end = WK_KLASS_ENUM_NAME(VolatileCallSite_klass); |
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1945 initialize_wk_klasses_until(jsr292_group_start, scan, CHECK); |
|
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1946 if (EnableInvokeDynamic) { |
|
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1947 initialize_wk_klasses_through(jsr292_group_end, scan, CHECK); |
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1948 } else { |
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1949 // Skip the JSR 292 classes, if not enabled. |
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1950 scan = WKID(jsr292_group_end + 1); |
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1951 } |
| 710 | 1952 |
|
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1953 initialize_wk_klasses_until(WKID_LIMIT, scan, CHECK); |
| 0 | 1954 |
| 1142 | 1955 _box_klasses[T_BOOLEAN] = WK_KLASS(Boolean_klass); |
| 1956 _box_klasses[T_CHAR] = WK_KLASS(Character_klass); | |
| 1957 _box_klasses[T_FLOAT] = WK_KLASS(Float_klass); | |
| 1958 _box_klasses[T_DOUBLE] = WK_KLASS(Double_klass); | |
| 1959 _box_klasses[T_BYTE] = WK_KLASS(Byte_klass); | |
| 1960 _box_klasses[T_SHORT] = WK_KLASS(Short_klass); | |
| 1961 _box_klasses[T_INT] = WK_KLASS(Integer_klass); | |
| 1962 _box_klasses[T_LONG] = WK_KLASS(Long_klass); | |
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1963 //_box_klasses[T_OBJECT] = WK_KLASS(object_klass); |
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1964 //_box_klasses[T_ARRAY] = WK_KLASS(object_klass); |
| 0 | 1965 |
| 1966 #ifdef KERNEL | |
| 3938 | 1967 if (DownloadManager_klass() == NULL) { |
| 0 | 1968 warning("Cannot find sun/jkernel/DownloadManager"); |
| 1969 } | |
| 1970 #endif // KERNEL | |
| 514 | 1971 |
| 0 | 1972 { // Compute whether we should use loadClass or loadClassInternal when loading classes. |
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1973 Method* method = InstanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::loadClassInternal_name(), vmSymbols::string_class_signature()); |
| 0 | 1974 _has_loadClassInternal = (method != NULL); |
| 1975 } | |
| 1976 { // Compute whether we should use checkPackageAccess or NOT | |
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1977 Method* method = InstanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::checkPackageAccess_name(), vmSymbols::class_protectiondomain_signature()); |
| 0 | 1978 _has_checkPackageAccess = (method != NULL); |
| 1979 } | |
| 1980 } | |
| 1981 | |
| 1982 // Tells if a given klass is a box (wrapper class, such as java.lang.Integer). | |
| 1983 // If so, returns the basic type it holds. If not, returns T_OBJECT. | |
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1984 BasicType SystemDictionary::box_klass_type(Klass* k) { |
| 0 | 1985 assert(k != NULL, ""); |
| 1986 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { | |
| 1987 if (_box_klasses[i] == k) | |
| 1988 return (BasicType)i; | |
| 1989 } | |
| 1990 return T_OBJECT; | |
| 1991 } | |
| 1992 | |
| 1993 // Constraints on class loaders. The details of the algorithm can be | |
| 1994 // found in the OOPSLA'98 paper "Dynamic Class Loading in the Java | |
| 1995 // Virtual Machine" by Sheng Liang and Gilad Bracha. The basic idea is | |
| 1996 // that the system dictionary needs to maintain a set of contraints that | |
| 1997 // must be satisfied by all classes in the dictionary. | |
| 1998 // if defining is true, then LinkageError if already in systemDictionary | |
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1999 // if initiating loader, then ok if InstanceKlass matches existing entry |
| 0 | 2000 |
| 2001 void SystemDictionary::check_constraints(int d_index, unsigned int d_hash, | |
| 2002 instanceKlassHandle k, | |
| 2003 Handle class_loader, bool defining, | |
| 2004 TRAPS) { | |
| 2005 const char *linkage_error = NULL; | |
| 2006 { | |
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2007 Symbol* name = k->name(); |
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2008 ClassLoaderData *loader_data = class_loader_data(class_loader); |
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2009 |
| 0 | 2010 MutexLocker mu(SystemDictionary_lock, THREAD); |
| 2011 | |
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2012 Klass* check = find_class(d_index, d_hash, name, loader_data); |
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2013 if (check != (Klass*)NULL) { |
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2014 // if different InstanceKlass - duplicate class definition, |
| 0 | 2015 // else - ok, class loaded by a different thread in parallel, |
| 2016 // we should only have found it if it was done loading and ok to use | |
| 2017 // system dictionary only holds instance classes, placeholders | |
| 2018 // also holds array classes | |
| 2019 | |
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2020 assert(check->oop_is_instance(), "noninstance in systemdictionary"); |
| 0 | 2021 if ((defining == true) || (k() != check)) { |
| 2022 linkage_error = "loader (instance of %s): attempted duplicate class " | |
| 2023 "definition for name: \"%s\""; | |
| 2024 } else { | |
| 2025 return; | |
| 2026 } | |
| 2027 } | |
| 2028 | |
| 2029 #ifdef ASSERT | |
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2030 Symbol* ph_check = find_placeholder(name, loader_data); |
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2031 assert(ph_check == NULL || ph_check == name, "invalid symbol"); |
| 0 | 2032 #endif |
| 2033 | |
| 2034 if (linkage_error == NULL) { | |
| 2035 if (constraints()->check_or_update(k, class_loader, name) == false) { | |
| 2036 linkage_error = "loader constraint violation: loader (instance of %s)" | |
| 2037 " previously initiated loading for a different type with name \"%s\""; | |
| 2038 } | |
| 2039 } | |
| 2040 } | |
| 2041 | |
| 2042 // Throw error now if needed (cannot throw while holding | |
| 2043 // SystemDictionary_lock because of rank ordering) | |
| 2044 | |
| 2045 if (linkage_error) { | |
| 2046 ResourceMark rm(THREAD); | |
| 2047 const char* class_loader_name = loader_name(class_loader()); | |
| 2048 char* type_name = k->name()->as_C_string(); | |
| 2049 size_t buflen = strlen(linkage_error) + strlen(class_loader_name) + | |
| 2050 strlen(type_name); | |
| 2051 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
| 2052 jio_snprintf(buf, buflen, linkage_error, class_loader_name, type_name); | |
| 2053 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); | |
| 2054 } | |
| 2055 } | |
| 2056 | |
| 2057 | |
| 2058 // Update system dictionary - done after check_constraint and add_to_hierachy | |
| 2059 // have been called. | |
| 2060 void SystemDictionary::update_dictionary(int d_index, unsigned int d_hash, | |
| 2061 int p_index, unsigned int p_hash, | |
| 2062 instanceKlassHandle k, | |
| 2063 Handle class_loader, | |
| 2064 TRAPS) { | |
| 2065 // Compile_lock prevents systemDictionary updates during compilations | |
| 2066 assert_locked_or_safepoint(Compile_lock); | |
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2067 Symbol* name = k->name(); |
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2068 ClassLoaderData *loader_data = class_loader_data(class_loader); |
| 0 | 2069 |
| 2070 { | |
| 2071 MutexLocker mu1(SystemDictionary_lock, THREAD); | |
| 2072 | |
| 2073 // See whether biased locking is enabled and if so set it for this | |
| 2074 // klass. | |
| 2075 // Note that this must be done past the last potential blocking | |
| 2076 // point / safepoint. We enable biased locking lazily using a | |
| 2077 // VM_Operation to iterate the SystemDictionary and installing the | |
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2078 // biasable mark word into each InstanceKlass's prototype header. |
| 0 | 2079 // To avoid race conditions where we accidentally miss enabling the |
| 2080 // optimization for one class in the process of being added to the | |
| 2081 // dictionary, we must not safepoint after the test of | |
| 2082 // BiasedLocking::enabled(). | |
| 2083 if (UseBiasedLocking && BiasedLocking::enabled()) { | |
| 2084 // Set biased locking bit for all loaded classes; it will be | |
| 2085 // cleared if revocation occurs too often for this type | |
| 2086 // NOTE that we must only do this when the class is initally | |
| 2087 // defined, not each time it is referenced from a new class loader | |
| 2088 if (k->class_loader() == class_loader()) { | |
| 2089 k->set_prototype_header(markOopDesc::biased_locking_prototype()); | |
| 2090 } | |
| 2091 } | |
| 2092 | |
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2093 // Assign a classid if one has not already been assigned. The |
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2094 // counter does not need to be atomically incremented since this |
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2095 // is only done while holding the SystemDictionary_lock. |
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2096 // All loaded classes get a unique ID. |
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2097 TRACE_INIT_ID(k); |
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2098 |
| 0 | 2099 // Check for a placeholder. If there, remove it and make a |
| 2100 // new system dictionary entry. | |
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2101 placeholders()->find_and_remove(p_index, p_hash, name, loader_data, THREAD); |
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2102 Klass* sd_check = find_class(d_index, d_hash, name, loader_data); |
| 0 | 2103 if (sd_check == NULL) { |
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2104 dictionary()->add_klass(name, loader_data, k); |
| 0 | 2105 notice_modification(); |
| 2106 } | |
| 2107 #ifdef ASSERT | |
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2108 sd_check = find_class(d_index, d_hash, name, loader_data); |
| 0 | 2109 assert (sd_check != NULL, "should have entry in system dictionary"); |
| 2110 // Changed to allow PH to remain to complete class circularity checking | |
| 2111 // while only one thread can define a class at one time, multiple | |
| 2112 // classes can resolve the superclass for a class at one time, | |
| 2113 // and the placeholder is used to track that | |
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2114 // Symbol* ph_check = find_placeholder(name, class_loader); |
| 0 | 2115 // assert (ph_check == NULL, "should not have a placeholder entry"); |
| 2116 #endif | |
| 2117 SystemDictionary_lock->notify_all(); | |
| 2118 } | |
| 2119 } | |
| 2120 | |
| 2121 | |
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2122 // Try to find a class name using the loader constraints. The |
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2123 // loader constraints might know about a class that isn't fully loaded |
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2124 // yet and these will be ignored. |
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2125 Klass* SystemDictionary::find_constrained_instance_or_array_klass( |
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2126 Symbol* class_name, Handle class_loader, TRAPS) { |
| 0 | 2127 |
| 2128 // First see if it has been loaded directly. | |
| 2129 // Force the protection domain to be null. (This removes protection checks.) | |
| 2130 Handle no_protection_domain; | |
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2131 Klass* klass = find_instance_or_array_klass(class_name, class_loader, |
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2132 no_protection_domain, CHECK_NULL); |
| 0 | 2133 if (klass != NULL) |
| 2134 return klass; | |
| 2135 | |
| 2136 // Now look to see if it has been loaded elsewhere, and is subject to | |
| 2137 // a loader constraint that would require this loader to return the | |
| 2138 // klass that is already loaded. | |
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2139 if (FieldType::is_array(class_name)) { |
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2140 // For array classes, their Klass*s are not kept in the |
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2141 // constraint table. The element Klass*s are. |
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2142 FieldArrayInfo fd; |
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2143 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
| 0 | 2144 if (t != T_OBJECT) { |
| 2145 klass = Universe::typeArrayKlassObj(t); | |
| 2146 } else { | |
| 2147 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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2148 klass = constraints()->find_constrained_klass(fd.object_key(), class_loader); |
| 0 | 2149 } |
| 1336 | 2150 // If element class already loaded, allocate array klass |
| 0 | 2151 if (klass != NULL) { |
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2152 klass = Klass::cast(klass)->array_klass_or_null(fd.dimension()); |
| 0 | 2153 } |
| 2154 } else { | |
| 2155 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 2156 // Non-array classes are easy: simply check the constraint table. | |
| 2157 klass = constraints()->find_constrained_klass(class_name, class_loader); | |
| 2158 } | |
| 2159 | |
| 2160 return klass; | |
| 2161 } | |
| 2162 | |
| 2163 | |
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2164 bool SystemDictionary::add_loader_constraint(Symbol* class_name, |
| 0 | 2165 Handle class_loader1, |
| 2166 Handle class_loader2, | |
| 2167 Thread* THREAD) { | |
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2168 ClassLoaderData* loader_data1 = class_loader_data(class_loader1); |
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2169 ClassLoaderData* loader_data2 = class_loader_data(class_loader2); |
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2170 |
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2171 Symbol* constraint_name = NULL; |
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2172 if (!FieldType::is_array(class_name)) { |
| 1336 | 2173 constraint_name = class_name; |
| 2174 } else { | |
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2175 // For array classes, their Klass*s are not kept in the |
| 1336 | 2176 // constraint table. The element classes are. |
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2177 FieldArrayInfo fd; |
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2178 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(false)); |
| 1336 | 2179 // primitive types always pass |
| 2180 if (t != T_OBJECT) { | |
| 2181 return true; | |
| 2182 } else { | |
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2183 constraint_name = fd.object_key(); |
| 1336 | 2184 } |
| 2185 } | |
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2186 unsigned int d_hash1 = dictionary()->compute_hash(constraint_name, loader_data1); |
| 0 | 2187 int d_index1 = dictionary()->hash_to_index(d_hash1); |
| 2188 | |
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2189 unsigned int d_hash2 = dictionary()->compute_hash(constraint_name, loader_data2); |
| 0 | 2190 int d_index2 = dictionary()->hash_to_index(d_hash2); |
| 2191 { | |
| 1336 | 2192 MutexLocker mu_s(SystemDictionary_lock, THREAD); |
| 0 | 2193 |
| 1336 | 2194 // Better never do a GC while we're holding these oops |
| 2195 No_Safepoint_Verifier nosafepoint; | |
| 0 | 2196 |
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2197 Klass* klass1 = find_class(d_index1, d_hash1, constraint_name, loader_data1); |
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2198 Klass* klass2 = find_class(d_index2, d_hash2, constraint_name, loader_data2); |
| 1336 | 2199 return constraints()->add_entry(constraint_name, klass1, class_loader1, |
| 2200 klass2, class_loader2); | |
| 0 | 2201 } |
| 2202 } | |
| 2203 | |
| 2204 // Add entry to resolution error table to record the error when the first | |
| 2205 // attempt to resolve a reference to a class has failed. | |
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2206 void SystemDictionary::add_resolution_error(constantPoolHandle pool, int which, Symbol* error) { |
| 0 | 2207 unsigned int hash = resolution_errors()->compute_hash(pool, which); |
| 2208 int index = resolution_errors()->hash_to_index(hash); | |
| 2209 { | |
| 2210 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
| 2211 resolution_errors()->add_entry(index, hash, pool, which, error); | |
| 2212 } | |
| 2213 } | |
| 2214 | |
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2215 // Delete a resolution error for RedefineClasses for a constant pool is going away |
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2216 void SystemDictionary::delete_resolution_error(ConstantPool* pool) { |
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2217 resolution_errors()->delete_entry(pool); |
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2218 } |
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2219 |
| 0 | 2220 // Lookup resolution error table. Returns error if found, otherwise NULL. |
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2221 Symbol* SystemDictionary::find_resolution_error(constantPoolHandle pool, int which) { |
| 0 | 2222 unsigned int hash = resolution_errors()->compute_hash(pool, which); |
| 2223 int index = resolution_errors()->hash_to_index(hash); | |
| 2224 { | |
| 2225 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
| 2226 ResolutionErrorEntry* entry = resolution_errors()->find_entry(index, hash, pool, which); | |
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2227 return (entry != NULL) ? entry->error() : (Symbol*)NULL; |
| 0 | 2228 } |
| 2229 } | |
| 2230 | |
| 2231 | |
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2232 // Signature constraints ensure that callers and callees agree about |
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2233 // the meaning of type names in their signatures. This routine is the |
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2234 // intake for constraints. It collects them from several places: |
|
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|
2235 // |
|
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|
2236 // * LinkResolver::resolve_method (if check_access is true) requires |
|
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|
2237 // that the resolving class (the caller) and the defining class of |
|
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|
2238 // the resolved method (the callee) agree on each type in the |
|
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|
2239 // method's signature. |
|
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|
2240 // |
|
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|
2241 // * LinkResolver::resolve_interface_method performs exactly the same |
|
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|
2242 // checks. |
|
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|
2243 // |
|
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|
2244 // * LinkResolver::resolve_field requires that the constant pool |
|
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|
2245 // attempting to link to a field agree with the field's defining |
|
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|
2246 // class about the type of the field signature. |
|
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|
2247 // |
|
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|
2248 // * klassVtable::initialize_vtable requires that, when a class |
|
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|
2249 // overrides a vtable entry allocated by a superclass, that the |
|
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|
2250 // overriding method (i.e., the callee) agree with the superclass |
|
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|
2251 // on each type in the method's signature. |
|
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|
2252 // |
|
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|
2253 // * klassItable::initialize_itable requires that, when a class fills |
|
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|
2254 // in its itables, for each non-abstract method installed in an |
|
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|
2255 // itable, the method (i.e., the callee) agree with the interface |
|
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|
2256 // on each type in the method's signature. |
|
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|
2257 // |
|
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|
2258 // All those methods have a boolean (check_access, checkconstraints) |
|
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|
2259 // which turns off the checks. This is used from specialized contexts |
|
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|
2260 // such as bootstrapping, dumping, and debugging. |
|
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|
2261 // |
|
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|
2262 // No direct constraint is placed between the class and its |
|
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diff
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|
2263 // supertypes. Constraints are only placed along linked relations |
|
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|
2264 // between callers and callees. When a method overrides or implements |
|
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|
2265 // an abstract method in a supertype (superclass or interface), the |
|
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diff
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|
2266 // constraints are placed as if the supertype were the caller to the |
|
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diff
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|
2267 // overriding method. (This works well, since callers to the |
|
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|
2268 // supertype have already established agreement between themselves and |
|
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|
2269 // the supertype.) As a result of all this, a class can disagree with |
|
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|
2270 // its supertype about the meaning of a type name, as long as that |
|
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|
2271 // class neither calls a relevant method of the supertype, nor is |
|
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|
2272 // called (perhaps via an override) from the supertype. |
|
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|
2273 // |
|
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|
2274 // |
|
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|
2275 // SystemDictionary::check_signature_loaders(sig, l1, l2) |
|
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|
2276 // |
| 0 | 2277 // Make sure all class components (including arrays) in the given |
| 2278 // signature will be resolved to the same class in both loaders. | |
| 2279 // Returns the name of the type that failed a loader constraint check, or | |
| 2280 // NULL if no constraint failed. The returned C string needs cleaning up | |
|
665
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|
2281 // with a ResourceMark in the caller. No exception except OOME is thrown. |
| 1336 | 2282 // Arrays are not added to the loader constraint table, their elements are. |
|
2177
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diff
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|
2283 char* SystemDictionary::check_signature_loaders(Symbol* signature, |
| 0 | 2284 Handle loader1, Handle loader2, |
| 2285 bool is_method, TRAPS) { | |
| 2286 // Nothing to do if loaders are the same. | |
| 2287 if (loader1() == loader2()) { | |
| 2288 return NULL; | |
| 2289 } | |
| 2290 | |
|
2177
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diff
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|
2291 ResourceMark rm(THREAD); |
| 0 | 2292 SignatureStream sig_strm(signature, is_method); |
| 2293 while (!sig_strm.is_done()) { | |
| 2294 if (sig_strm.is_object()) { | |
|
2177
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|
2295 Symbol* s = sig_strm.as_symbol(CHECK_NULL); |
|
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diff
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|
2296 Symbol* sig = s; |
| 0 | 2297 if (!add_loader_constraint(sig, loader1, loader2, THREAD)) { |
|
2177
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|
2298 return sig->as_C_string(); |
| 0 | 2299 } |
| 2300 } | |
| 2301 sig_strm.next(); | |
| 2302 } | |
| 2303 return NULL; | |
| 2304 } | |
| 2305 | |
| 2306 | |
|
6266
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|
2307 methodHandle SystemDictionary::find_method_handle_intrinsic(vmIntrinsics::ID iid, |
|
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|
2308 Symbol* signature, |
|
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|
2309 TRAPS) { |
|
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|
2310 methodHandle empty; |
|
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|
2311 assert(EnableInvokeDynamic, ""); |
|
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|
2312 assert(MethodHandles::is_signature_polymorphic(iid) && |
|
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|
2313 MethodHandles::is_signature_polymorphic_intrinsic(iid) && |
|
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|
2314 iid != vmIntrinsics::_invokeGeneric, |
|
1d7922586cf6
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|
2315 err_msg("must be a known MH intrinsic iid=%d: %s", iid, vmIntrinsics::name_at(iid))); |
|
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|
2316 |
|
1d7922586cf6
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|
2317 unsigned int hash = invoke_method_table()->compute_hash(signature, iid); |
| 710 | 2318 int index = invoke_method_table()->hash_to_index(hash); |
|
6266
1d7922586cf6
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|
2319 SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, iid); |
|
1d7922586cf6
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|
2320 methodHandle m; |
|
6725
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6266
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|
2321 if (spe == NULL || spe->method() == NULL) { |
|
1508
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2322 spe = NULL; |
| 710 | 2323 // Must create lots of stuff here, but outside of the SystemDictionary lock. |
|
6725
da91efe96a93
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|
2324 m = Method::make_method_handle_intrinsic(iid, signature, CHECK_(empty)); |
|
6266
1d7922586cf6
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|
2325 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_highest_tier, |
|
1d7922586cf6
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6217
diff
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|
2326 methodHandle(), CompileThreshold, "MH", CHECK_(empty)); |
|
1d7922586cf6
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6217
diff
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|
2327 |
| 710 | 2328 // Now grab the lock. We might have to throw away the new method, |
| 2329 // if a racing thread has managed to install one at the same time. | |
|
6266
1d7922586cf6
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6217
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|
2330 { |
|
1d7922586cf6
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6217
diff
changeset
|
2331 MutexLocker ml(SystemDictionary_lock, THREAD); |
|
1d7922586cf6
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6217
diff
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|
2332 spe = invoke_method_table()->find_entry(index, hash, signature, iid); |
| 710 | 2333 if (spe == NULL) |
|
6266
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6217
diff
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|
2334 spe = invoke_method_table()->add_entry(index, hash, signature, iid); |
|
6725
da91efe96a93
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coleenp
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changeset
|
2335 if (spe->method() == NULL) |
|
da91efe96a93
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|
2336 spe->set_method(m()); |
|
6266
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6217
diff
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|
2337 } |
|
1d7922586cf6
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6217
diff
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|
2338 } |
|
1d7922586cf6
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6217
diff
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|
2339 |
|
6725
da91efe96a93
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6266
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|
2340 assert(spe != NULL && spe->method() != NULL, ""); |
|
da91efe96a93
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coleenp
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6266
diff
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|
2341 return spe->method(); |
|
6266
1d7922586cf6
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6217
diff
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|
2342 } |
|
1d7922586cf6
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6217
diff
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|
2343 |
|
1d7922586cf6
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6217
diff
changeset
|
2344 // Helper for unpacking the return value from linkMethod and linkCallSite. |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
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6217
diff
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|
2345 static methodHandle unpack_method_and_appendix(Handle mname, |
|
1d7922586cf6
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6217
diff
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|
2346 objArrayHandle appendix_box, |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
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6217
diff
changeset
|
2347 Handle* appendix_result, |
|
1d7922586cf6
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twisti
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6217
diff
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|
2348 TRAPS) { |
|
1d7922586cf6
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twisti
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6217
diff
changeset
|
2349 methodHandle empty; |
|
1d7922586cf6
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twisti
parents:
6217
diff
changeset
|
2350 if (mname.not_null()) { |
|
6725
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6964458: Reimplement class meta-data storage to use native memory
coleenp
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6266
diff
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|
2351 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); |
|
6266
1d7922586cf6
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6217
diff
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|
2352 if (vmtarget != NULL && vmtarget->is_method()) { |
|
6725
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coleenp
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6266
diff
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|
2353 Method* m = (Method*)vmtarget; |
|
6266
1d7922586cf6
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6217
diff
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|
2354 oop appendix = appendix_box->obj_at(0); |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
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6217
diff
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|
2355 if (TraceMethodHandles) { |
|
1d7922586cf6
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twisti
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6217
diff
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|
2356 #ifndef PRODUCT |
|
1d7922586cf6
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6217
diff
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|
2357 tty->print("Linked method="INTPTR_FORMAT": ", m); |
|
1d7922586cf6
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twisti
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6217
diff
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|
2358 m->print(); |
|
1d7922586cf6
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6217
diff
changeset
|
2359 if (appendix != NULL) { tty->print("appendix = "); appendix->print(); } |
|
1d7922586cf6
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twisti
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6217
diff
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|
2360 tty->cr(); |
|
1d7922586cf6
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twisti
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6217
diff
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|
2361 #endif //PRODUCT |
|
3363
167b70ff3abc
6939861: JVM should handle more conversion operations
never
parents:
3245
diff
changeset
|
2362 } |
|
6266
1d7922586cf6
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6217
diff
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|
2363 (*appendix_result) = Handle(THREAD, appendix); |
|
1d7922586cf6
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6217
diff
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|
2364 return methodHandle(THREAD, m); |
| 710 | 2365 } |
| 2366 } | |
|
6266
1d7922586cf6
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6217
diff
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|
2367 THROW_MSG_(vmSymbols::java_lang_LinkageError(), "bad value from MethodHandleNatives", empty); |
|
1d7922586cf6
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twisti
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6217
diff
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|
2368 return empty; |
|
1d7922586cf6
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twisti
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6217
diff
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|
2369 } |
|
1d7922586cf6
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6217
diff
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|
2370 |
|
1d7922586cf6
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6217
diff
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|
2371 methodHandle SystemDictionary::find_method_handle_invoker(Symbol* name, |
|
1d7922586cf6
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6217
diff
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|
2372 Symbol* signature, |
|
1d7922586cf6
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6217
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|
2373 KlassHandle accessing_klass, |
|
6822
f6b0eb4e44cf
7200949: JSR 292: rubybench/bench/time/bench_base64.rb fails with jruby.jar not on boot class path
twisti
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6751
diff
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|
2374 Handle *appendix_result, |
|
f6b0eb4e44cf
7200949: JSR 292: rubybench/bench/time/bench_base64.rb fails with jruby.jar not on boot class path
twisti
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6751
diff
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|
2375 Handle *method_type_result, |
|
6266
1d7922586cf6
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6217
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|
2376 TRAPS) { |
|
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2377 methodHandle empty; |
|
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2378 assert(EnableInvokeDynamic, ""); |
|
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2379 assert(!THREAD->is_Compiler_thread(), ""); |
|
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2380 Handle method_type = |
|
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2381 SystemDictionary::find_method_handle_type(signature, accessing_klass, CHECK_(empty)); |
|
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2382 if (false) { // FIXME: Decide if the Java upcall should resolve signatures. |
|
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2383 method_type = java_lang_String::create_from_symbol(signature, CHECK_(empty)); |
|
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2384 } |
|
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2385 |
|
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2386 KlassHandle mh_klass = SystemDictionary::MethodHandle_klass(); |
|
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2387 int ref_kind = JVM_REF_invokeVirtual; |
|
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2388 Handle name_str = StringTable::intern(name, CHECK_(empty)); |
|
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2389 objArrayHandle appendix_box = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1, CHECK_(empty)); |
|
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2390 assert(appendix_box->obj_at(0) == NULL, ""); |
|
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2391 |
|
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2392 // call java.lang.invoke.MethodHandleNatives::linkMethod(... String, MethodType) -> MemberName |
|
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|
2393 JavaCallArguments args; |
|
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|
2394 args.push_oop(accessing_klass()->java_mirror()); |
|
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|
2395 args.push_int(ref_kind); |
|
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2396 args.push_oop(mh_klass()->java_mirror()); |
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2397 args.push_oop(name_str()); |
|
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2398 args.push_oop(method_type()); |
|
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2399 args.push_oop(appendix_box()); |
|
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2400 JavaValue result(T_OBJECT); |
|
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2401 JavaCalls::call_static(&result, |
|
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|
2402 SystemDictionary::MethodHandleNatives_klass(), |
|
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|
2403 vmSymbols::linkMethod_name(), |
|
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|
2404 vmSymbols::linkMethod_signature(), |
|
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|
2405 &args, CHECK_(empty)); |
|
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|
2406 Handle mname(THREAD, (oop) result.get_jobject()); |
|
6822
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|
2407 (*method_type_result) = method_type; |
|
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2408 return unpack_method_and_appendix(mname, appendix_box, appendix_result, THREAD); |
| 710 | 2409 } |
| 2410 | |
|
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2411 |
|
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|
2412 // Ask Java code to find or construct a java.lang.invoke.MethodType for the given |
| 710 | 2413 // signature, as interpreted relative to the given class loader. |
| 2414 // Because of class loader constraints, all method handle usage must be | |
| 2415 // consistent with this loader. | |
|
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2416 Handle SystemDictionary::find_method_handle_type(Symbol* signature, |
|
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|
2417 KlassHandle accessing_klass, |
|
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|
2418 TRAPS) { |
|
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2419 Handle empty; |
|
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|
2420 vmIntrinsics::ID null_iid = vmIntrinsics::_none; // distinct from all method handle invoker intrinsics |
|
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2421 unsigned int hash = invoke_method_table()->compute_hash(signature, null_iid); |
|
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|
2422 int index = invoke_method_table()->hash_to_index(hash); |
|
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2423 SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, null_iid); |
|
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2424 if (spe != NULL && spe->method_type() != NULL) { |
|
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2425 assert(java_lang_invoke_MethodType::is_instance(spe->method_type()), ""); |
|
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2426 return Handle(THREAD, spe->method_type()); |
|
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|
2427 } else if (THREAD->is_Compiler_thread()) { |
|
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|
2428 warning("SystemDictionary::find_method_handle_type called from compiler thread"); // FIXME |
|
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|
2429 return Handle(); // do not attempt from within compiler, unless it was cached |
|
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|
2430 } |
|
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|
2431 |
|
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|
2432 Handle class_loader, protection_domain; |
|
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|
2433 bool is_on_bcp = true; // keep this true as long as we can materialize from the boot classloader |
|
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|
2434 int npts = ArgumentCount(signature).size(); |
| 1142 | 2435 objArrayHandle pts = oopFactory::new_objArray(SystemDictionary::Class_klass(), npts, CHECK_(empty)); |
| 710 | 2436 int arg = 0; |
| 2437 Handle rt; // the return type from the signature | |
|
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|
2438 ResourceMark rm(THREAD); |
|
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|
2439 for (SignatureStream ss(signature); !ss.is_done(); ss.next()) { |
|
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|
2440 oop mirror = NULL; |
|
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|
2441 if (is_on_bcp) { |
|
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|
2442 // Note: class_loader & protection_domain are both null at this point. |
|
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|
2443 mirror = ss.as_java_mirror(class_loader, protection_domain, |
|
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|
2444 SignatureStream::ReturnNull, CHECK_(empty)); |
|
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|
2445 if (mirror == NULL) { |
|
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|
2446 // fall back from BCP to accessing_klass |
|
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|
2447 if (accessing_klass.not_null()) { |
|
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|
2448 class_loader = Handle(THREAD, InstanceKlass::cast(accessing_klass())->class_loader()); |
|
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|
2449 protection_domain = Handle(THREAD, InstanceKlass::cast(accessing_klass())->protection_domain()); |
|
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|
2450 } |
|
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|
2451 is_on_bcp = false; |
|
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|
2452 } |
|
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|
2453 } |
|
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|
2454 if (!is_on_bcp) { |
|
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|
2455 // Resolve, throwing a real error if it doesn't work. |
|
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|
2456 mirror = ss.as_java_mirror(class_loader, protection_domain, |
|
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|
2457 SignatureStream::NCDFError, CHECK_(empty)); |
| 710 | 2458 } |
| 2459 if (ss.at_return_type()) | |
| 2460 rt = Handle(THREAD, mirror); | |
| 2461 else | |
| 2462 pts->obj_at_put(arg++, mirror); | |
|
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|
2463 |
|
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|
2464 // Check accessibility. |
|
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|
2465 if (ss.is_object() && accessing_klass.not_null()) { |
|
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|
2466 Klass* sel_klass = java_lang_Class::as_Klass(mirror); |
|
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|
2467 mirror = NULL; // safety |
|
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|
2468 // Emulate ConstantPool::verify_constant_pool_resolve. |
|
1508
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|
2469 if (Klass::cast(sel_klass)->oop_is_objArray()) |
|
6831
d8ce2825b193
8000213: NPG: Should have renamed arrayKlass and typeArrayKlass
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|
2470 sel_klass = ObjArrayKlass::cast(sel_klass)->bottom_klass(); |
|
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|
2471 if (Klass::cast(sel_klass)->oop_is_instance()) { |
|
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|
2472 KlassHandle sel_kh(THREAD, sel_klass); |
|
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|
2473 LinkResolver::check_klass_accessability(accessing_klass, sel_kh, CHECK_(empty)); |
|
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|
2474 } |
|
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|
2475 } |
| 710 | 2476 } |
| 2477 assert(arg == npts, ""); | |
| 2478 | |
|
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|
2479 // call java.lang.invoke.MethodHandleNatives::findMethodType(Class rt, Class[] pts) -> MethodType |
| 710 | 2480 JavaCallArguments args(Handle(THREAD, rt())); |
| 2481 args.push_oop(pts()); | |
| 2482 JavaValue result(T_OBJECT); | |
| 2483 JavaCalls::call_static(&result, | |
|
1507
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diff
changeset
|
2484 SystemDictionary::MethodHandleNatives_klass(), |
|
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1339
diff
changeset
|
2485 vmSymbols::findMethodHandleType_name(), |
| 2460 | 2486 vmSymbols::findMethodHandleType_signature(), |
| 710 | 2487 &args, CHECK_(empty)); |
|
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|
2488 Handle method_type(THREAD, (oop) result.get_jobject()); |
|
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|
2489 |
|
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|
2490 if (is_on_bcp) { |
|
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|
2491 // We can cache this MethodType inside the JVM. |
|
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|
2492 MutexLocker ml(SystemDictionary_lock, THREAD); |
|
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|
2493 spe = invoke_method_table()->find_entry(index, hash, signature, null_iid); |
|
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|
2494 if (spe == NULL) |
|
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|
2495 spe = invoke_method_table()->add_entry(index, hash, signature, null_iid); |
|
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|
2496 if (spe->method_type() == NULL) { |
|
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|
2497 spe->set_method_type(method_type()); |
|
1793
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diff
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|
2498 } |
|
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|
2499 } |
|
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|
2500 |
|
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|
2501 // report back to the caller with the MethodType |
|
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|
2502 return method_type; |
| 710 | 2503 } |
| 2504 | |
| 1602 | 2505 // Ask Java code to find or construct a method handle constant. |
| 2506 Handle SystemDictionary::link_method_handle_constant(KlassHandle caller, | |
| 2507 int ref_kind, //e.g., JVM_REF_invokeVirtual | |
| 2508 KlassHandle callee, | |
|
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|
2509 Symbol* name_sym, |
|
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|
2510 Symbol* signature, |
| 1602 | 2511 TRAPS) { |
| 2512 Handle empty; | |
|
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|
2513 Handle name = java_lang_String::create_from_symbol(name_sym, CHECK_(empty)); |
| 1602 | 2514 Handle type; |
| 2515 if (signature->utf8_length() > 0 && signature->byte_at(0) == '(') { | |
|
6266
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2516 type = find_method_handle_type(signature, caller, CHECK_(empty)); |
| 1602 | 2517 } else { |
|
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2518 ResourceMark rm(THREAD); |
|
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2519 SignatureStream ss(signature, false); |
| 1602 | 2520 if (!ss.is_done()) { |
| 2521 oop mirror = ss.as_java_mirror(caller->class_loader(), caller->protection_domain(), | |
| 2522 SignatureStream::NCDFError, CHECK_(empty)); | |
| 2523 type = Handle(THREAD, mirror); | |
| 2524 ss.next(); | |
| 2525 if (!ss.is_done()) type = Handle(); // error! | |
| 2526 } | |
| 2527 } | |
| 2528 if (type.is_null()) { | |
| 2529 THROW_MSG_(vmSymbols::java_lang_LinkageError(), "bad signature", empty); | |
| 2530 } | |
| 2531 | |
|
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2532 // call java.lang.invoke.MethodHandleNatives::linkMethodHandleConstant(Class caller, int refKind, Class callee, String name, Object type) -> MethodHandle |
| 1602 | 2533 JavaCallArguments args; |
| 2534 args.push_oop(caller->java_mirror()); // the referring class | |
| 2535 args.push_int(ref_kind); | |
| 2536 args.push_oop(callee->java_mirror()); // the target class | |
| 2537 args.push_oop(name()); | |
| 2538 args.push_oop(type()); | |
| 2539 JavaValue result(T_OBJECT); | |
| 2540 JavaCalls::call_static(&result, | |
| 2541 SystemDictionary::MethodHandleNatives_klass(), | |
| 2542 vmSymbols::linkMethodHandleConstant_name(), | |
| 2460 | 2543 vmSymbols::linkMethodHandleConstant_signature(), |
| 1602 | 2544 &args, CHECK_(empty)); |
| 2545 return Handle(THREAD, (oop) result.get_jobject()); | |
| 2546 } | |
| 710 | 2547 |
|
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2548 // Ask Java code to find or construct a java.lang.invoke.CallSite for the given |
|
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2549 // name and signature, as interpreted relative to the given class loader. |
|
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2550 methodHandle SystemDictionary::find_dynamic_call_site_invoker(KlassHandle caller, |
|
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2551 Handle bootstrap_specifier, |
|
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2552 Symbol* name, |
|
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2553 Symbol* type, |
|
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2554 Handle *appendix_result, |
|
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2555 Handle *method_type_result, |
|
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2556 TRAPS) { |
|
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2557 methodHandle empty; |
|
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2558 Handle bsm, info; |
|
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2559 if (java_lang_invoke_MethodHandle::is_instance(bootstrap_specifier())) { |
|
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2560 bsm = bootstrap_specifier; |
|
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2561 } else { |
|
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2562 assert(bootstrap_specifier->is_objArray(), ""); |
|
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2563 objArrayHandle args(THREAD, (objArrayOop) bootstrap_specifier()); |
|
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2564 int len = args->length(); |
|
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2565 assert(len >= 1, ""); |
|
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2566 bsm = Handle(THREAD, args->obj_at(0)); |
|
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2567 if (len > 1) { |
|
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2568 objArrayOop args1 = oopFactory::new_objArray(SystemDictionary::Object_klass(), len-1, CHECK_(empty)); |
|
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2569 for (int i = 1; i < len; i++) |
|
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2570 args1->obj_at_put(i-1, args->obj_at(i)); |
|
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2571 info = Handle(THREAD, args1); |
|
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2572 } |
|
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|
2573 } |
|
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2574 guarantee(java_lang_invoke_MethodHandle::is_instance(bsm()), |
|
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|
2575 "caller must supply a valid BSM"); |
|
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2576 |
|
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2577 Handle method_name = java_lang_String::create_from_symbol(name, CHECK_(empty)); |
|
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2578 Handle method_type = find_method_handle_type(type, caller, CHECK_(empty)); |
|
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2579 |
|
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2580 objArrayHandle appendix_box = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1, CHECK_(empty)); |
|
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2581 assert(appendix_box->obj_at(0) == NULL, ""); |
|
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2582 |
|
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2583 // call java.lang.invoke.MethodHandleNatives::linkCallSite(caller, bsm, name, mtype, info, &appendix) |
|
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|
2584 JavaCallArguments args; |
|
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|
2585 args.push_oop(caller->java_mirror()); |
|
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|
2586 args.push_oop(bsm()); |
|
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|
2587 args.push_oop(method_name()); |
|
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|
2588 args.push_oop(method_type()); |
|
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|
2589 args.push_oop(info()); |
|
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2590 args.push_oop(appendix_box); |
|
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2591 JavaValue result(T_OBJECT); |
|
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2592 JavaCalls::call_static(&result, |
|
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|
2593 SystemDictionary::MethodHandleNatives_klass(), |
|
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2594 vmSymbols::linkCallSite_name(), |
|
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|
2595 vmSymbols::linkCallSite_signature(), |
|
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|
2596 &args, CHECK_(empty)); |
|
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|
2597 Handle mname(THREAD, (oop) result.get_jobject()); |
|
6822
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|
2598 (*method_type_result) = method_type; |
|
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|
2599 return unpack_method_and_appendix(mname, appendix_box, appendix_result, THREAD); |
|
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|
2600 } |
|
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|
2601 |
| 0 | 2602 // Since the identity hash code for symbols changes when the symbols are |
| 2603 // moved from the regular perm gen (hash in the mark word) to the shared | |
| 2604 // spaces (hash is the address), the classes loaded into the dictionary | |
| 2605 // may be in the wrong buckets. | |
| 2606 | |
| 2607 void SystemDictionary::reorder_dictionary() { | |
| 2608 dictionary()->reorder_dictionary(); | |
| 2609 } | |
| 2610 | |
| 2611 | |
| 2612 void SystemDictionary::copy_buckets(char** top, char* end) { | |
| 2613 dictionary()->copy_buckets(top, end); | |
| 2614 } | |
| 2615 | |
| 2616 | |
| 2617 void SystemDictionary::copy_table(char** top, char* end) { | |
| 2618 dictionary()->copy_table(top, end); | |
| 2619 } | |
| 2620 | |
| 2621 | |
| 2622 void SystemDictionary::reverse() { | |
| 2623 dictionary()->reverse(); | |
| 2624 } | |
| 2625 | |
| 2626 int SystemDictionary::number_of_classes() { | |
| 2627 return dictionary()->number_of_entries(); | |
| 2628 } | |
| 2629 | |
| 2630 | |
| 2631 // ---------------------------------------------------------------------------- | |
| 2632 #ifndef PRODUCT | |
| 2633 | |
| 2634 void SystemDictionary::print() { | |
| 2635 dictionary()->print(); | |
| 2636 | |
| 2637 // Placeholders | |
| 2638 GCMutexLocker mu(SystemDictionary_lock); | |
| 2639 placeholders()->print(); | |
| 2640 | |
| 2641 // loader constraints - print under SD_lock | |
| 2642 constraints()->print(); | |
| 2643 } | |
| 2644 | |
| 2645 #endif | |
| 2646 | |
| 2647 void SystemDictionary::verify() { | |
| 2648 guarantee(dictionary() != NULL, "Verify of system dictionary failed"); | |
| 2649 guarantee(constraints() != NULL, | |
| 2650 "Verify of loader constraints failed"); | |
| 2651 guarantee(dictionary()->number_of_entries() >= 0 && | |
| 2652 placeholders()->number_of_entries() >= 0, | |
| 2653 "Verify of system dictionary failed"); | |
| 2654 | |
| 2655 // Verify dictionary | |
| 2656 dictionary()->verify(); | |
| 2657 | |
| 2658 GCMutexLocker mu(SystemDictionary_lock); | |
| 2659 placeholders()->verify(); | |
| 2660 | |
| 2661 // Verify constraint table | |
| 2662 guarantee(constraints() != NULL, "Verify of loader constraints failed"); | |
|
1258
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|
2663 constraints()->verify(dictionary(), placeholders()); |
| 0 | 2664 } |
| 2665 | |
| 2666 | |
|
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2667 void SystemDictionary::verify_obj_klass_present(Symbol* class_name, |
|
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|
2668 ClassLoaderData* loader_data) { |
| 0 | 2669 GCMutexLocker mu(SystemDictionary_lock); |
|
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2670 Symbol* name; |
|
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|
2671 |
|
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|
2672 Klass* probe = find_class(class_name, loader_data); |
| 0 | 2673 if (probe == NULL) { |
| 2674 probe = SystemDictionary::find_shared_class(class_name); | |
|
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2675 if (probe == NULL) { |
|
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|
2676 name = find_placeholder(class_name, loader_data); |
|
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|
2677 } |
| 0 | 2678 } |
|
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|
2679 guarantee(probe != NULL || name != NULL, |
|
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2680 "Loaded klasses should be in SystemDictionary"); |
| 0 | 2681 } |
| 2682 | |
| 2683 #ifndef PRODUCT | |
| 2684 | |
| 2685 // statistics code | |
| 2686 class ClassStatistics: AllStatic { | |
| 2687 private: | |
| 2688 static int nclasses; // number of classes | |
| 2689 static int nmethods; // number of methods | |
| 2690 static int nmethoddata; // number of methodData | |
| 2691 static int class_size; // size of class objects in words | |
| 2692 static int method_size; // size of method objects in words | |
| 2693 static int debug_size; // size of debug info in methods | |
| 2694 static int methoddata_size; // size of methodData objects in words | |
| 2695 | |
|
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|
2696 static void do_class(Klass* k) { |
| 0 | 2697 nclasses++; |
| 2698 class_size += k->size(); | |
|
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2699 if (k->oop_is_instance()) { |
|
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|
2700 InstanceKlass* ik = (InstanceKlass*)k; |
| 0 | 2701 class_size += ik->methods()->size(); |
| 2702 class_size += ik->constants()->size(); | |
| 2703 class_size += ik->local_interfaces()->size(); | |
| 2704 class_size += ik->transitive_interfaces()->size(); | |
| 2705 // We do not have to count implementors, since we only store one! | |
|
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2706 // SSS: How should these be accounted now that they have moved? |
|
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|
2707 // class_size += ik->fields()->length(); |
| 0 | 2708 } |
| 2709 } | |
| 2710 | |
|
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|
2711 static void do_method(Method* m) { |
| 0 | 2712 nmethods++; |
| 2713 method_size += m->size(); | |
| 2714 // class loader uses same objArray for empty vectors, so don't count these | |
| 2715 if (m->has_stackmap_table()) { | |
| 2716 method_size += m->stackmap_data()->size(); | |
| 2717 } | |
| 2718 | |
|
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|
2719 MethodData* mdo = m->method_data(); |
| 0 | 2720 if (mdo != NULL) { |
| 2721 nmethoddata++; | |
| 2722 methoddata_size += mdo->size(); | |
| 2723 } | |
| 2724 } | |
| 2725 | |
| 2726 public: | |
| 2727 static void print() { | |
| 2728 SystemDictionary::classes_do(do_class); | |
| 2729 SystemDictionary::methods_do(do_method); | |
| 2730 tty->print_cr("Class statistics:"); | |
| 2731 tty->print_cr("%d classes (%d bytes)", nclasses, class_size * oopSize); | |
| 2732 tty->print_cr("%d methods (%d bytes = %d base + %d debug info)", nmethods, | |
| 2733 (method_size + debug_size) * oopSize, method_size * oopSize, debug_size * oopSize); | |
| 2734 tty->print_cr("%d methoddata (%d bytes)", nmethoddata, methoddata_size * oopSize); | |
| 2735 } | |
| 2736 }; | |
| 2737 | |
| 2738 | |
| 2739 int ClassStatistics::nclasses = 0; | |
| 2740 int ClassStatistics::nmethods = 0; | |
| 2741 int ClassStatistics::nmethoddata = 0; | |
| 2742 int ClassStatistics::class_size = 0; | |
| 2743 int ClassStatistics::method_size = 0; | |
| 2744 int ClassStatistics::debug_size = 0; | |
| 2745 int ClassStatistics::methoddata_size = 0; | |
| 2746 | |
| 2747 void SystemDictionary::print_class_statistics() { | |
| 2748 ResourceMark rm; | |
| 2749 ClassStatistics::print(); | |
| 2750 } | |
| 2751 | |
| 2752 | |
| 2753 class MethodStatistics: AllStatic { | |
| 2754 public: | |
| 2755 enum { | |
| 2756 max_parameter_size = 10 | |
| 2757 }; | |
| 2758 private: | |
| 2759 | |
| 2760 static int _number_of_methods; | |
| 2761 static int _number_of_final_methods; | |
| 2762 static int _number_of_static_methods; | |
| 2763 static int _number_of_native_methods; | |
| 2764 static int _number_of_synchronized_methods; | |
| 2765 static int _number_of_profiled_methods; | |
| 2766 static int _number_of_bytecodes; | |
| 2767 static int _parameter_size_profile[max_parameter_size]; | |
| 2768 static int _bytecodes_profile[Bytecodes::number_of_java_codes]; | |
| 2769 | |
| 2770 static void initialize() { | |
| 2771 _number_of_methods = 0; | |
| 2772 _number_of_final_methods = 0; | |
| 2773 _number_of_static_methods = 0; | |
| 2774 _number_of_native_methods = 0; | |
| 2775 _number_of_synchronized_methods = 0; | |
| 2776 _number_of_profiled_methods = 0; | |
| 2777 _number_of_bytecodes = 0; | |
| 2778 for (int i = 0; i < max_parameter_size ; i++) _parameter_size_profile[i] = 0; | |
| 2779 for (int j = 0; j < Bytecodes::number_of_java_codes; j++) _bytecodes_profile [j] = 0; | |
| 2780 }; | |
| 2781 | |
|
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changeset
|
2782 static void do_method(Method* m) { |
| 0 | 2783 _number_of_methods++; |
| 2784 // collect flag info | |
| 2785 if (m->is_final() ) _number_of_final_methods++; | |
| 2786 if (m->is_static() ) _number_of_static_methods++; | |
| 2787 if (m->is_native() ) _number_of_native_methods++; | |
| 2788 if (m->is_synchronized()) _number_of_synchronized_methods++; | |
| 2789 if (m->method_data() != NULL) _number_of_profiled_methods++; | |
| 2790 // collect parameter size info (add one for receiver, if any) | |
| 2791 _parameter_size_profile[MIN2(m->size_of_parameters() + (m->is_static() ? 0 : 1), max_parameter_size - 1)]++; | |
| 2792 // collect bytecodes info | |
| 2793 { | |
| 2794 Thread *thread = Thread::current(); | |
| 2795 HandleMark hm(thread); | |
| 2796 BytecodeStream s(methodHandle(thread, m)); | |
| 2797 Bytecodes::Code c; | |
| 2798 while ((c = s.next()) >= 0) { | |
| 2799 _number_of_bytecodes++; | |
| 2800 _bytecodes_profile[c]++; | |
| 2801 } | |
| 2802 } | |
| 2803 } | |
| 2804 | |
| 2805 public: | |
| 2806 static void print() { | |
| 2807 initialize(); | |
| 2808 SystemDictionary::methods_do(do_method); | |
| 2809 // generate output | |
| 2810 tty->cr(); | |
| 2811 tty->print_cr("Method statistics (static):"); | |
| 2812 // flag distribution | |
| 2813 tty->cr(); | |
| 2814 tty->print_cr("%6d final methods %6.1f%%", _number_of_final_methods , _number_of_final_methods * 100.0F / _number_of_methods); | |
| 2815 tty->print_cr("%6d static methods %6.1f%%", _number_of_static_methods , _number_of_static_methods * 100.0F / _number_of_methods); | |
| 2816 tty->print_cr("%6d native methods %6.1f%%", _number_of_native_methods , _number_of_native_methods * 100.0F / _number_of_methods); | |
| 2817 tty->print_cr("%6d synchronized methods %6.1f%%", _number_of_synchronized_methods, _number_of_synchronized_methods * 100.0F / _number_of_methods); | |
| 2818 tty->print_cr("%6d profiled methods %6.1f%%", _number_of_profiled_methods, _number_of_profiled_methods * 100.0F / _number_of_methods); | |
| 2819 // parameter size profile | |
| 2820 tty->cr(); | |
| 2821 { int tot = 0; | |
| 2822 int avg = 0; | |
| 2823 for (int i = 0; i < max_parameter_size; i++) { | |
| 2824 int n = _parameter_size_profile[i]; | |
| 2825 tot += n; | |
| 2826 avg += n*i; | |
| 2827 tty->print_cr("parameter size = %1d: %6d methods %5.1f%%", i, n, n * 100.0F / _number_of_methods); | |
| 2828 } | |
| 2829 assert(tot == _number_of_methods, "should be the same"); | |
| 2830 tty->print_cr(" %6d methods 100.0%%", _number_of_methods); | |
| 2831 tty->print_cr("(average parameter size = %3.1f including receiver, if any)", (float)avg / _number_of_methods); | |
| 2832 } | |
| 2833 // bytecodes profile | |
| 2834 tty->cr(); | |
| 2835 { int tot = 0; | |
| 2836 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) { | |
| 2837 if (Bytecodes::is_defined(i)) { | |
| 2838 Bytecodes::Code c = Bytecodes::cast(i); | |
| 2839 int n = _bytecodes_profile[c]; | |
| 2840 tot += n; | |
| 2841 tty->print_cr("%9d %7.3f%% %s", n, n * 100.0F / _number_of_bytecodes, Bytecodes::name(c)); | |
| 2842 } | |
| 2843 } | |
| 2844 assert(tot == _number_of_bytecodes, "should be the same"); | |
| 2845 tty->print_cr("%9d 100.000%%", _number_of_bytecodes); | |
| 2846 } | |
| 2847 tty->cr(); | |
| 2848 } | |
| 2849 }; | |
| 2850 | |
| 2851 int MethodStatistics::_number_of_methods; | |
| 2852 int MethodStatistics::_number_of_final_methods; | |
| 2853 int MethodStatistics::_number_of_static_methods; | |
| 2854 int MethodStatistics::_number_of_native_methods; | |
| 2855 int MethodStatistics::_number_of_synchronized_methods; | |
| 2856 int MethodStatistics::_number_of_profiled_methods; | |
| 2857 int MethodStatistics::_number_of_bytecodes; | |
| 2858 int MethodStatistics::_parameter_size_profile[MethodStatistics::max_parameter_size]; | |
| 2859 int MethodStatistics::_bytecodes_profile[Bytecodes::number_of_java_codes]; | |
| 2860 | |
| 2861 | |
| 2862 void SystemDictionary::print_method_statistics() { | |
| 2863 MethodStatistics::print(); | |
| 2864 } | |
| 2865 | |
| 2866 #endif // PRODUCT |