| File: | jdk/src/hotspot/share/classfile/systemDictionary.cpp |
| Warning: | line 700, column 29 Value stored to 'newprobe' during its initialization is never read |
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| 1 | /* |
| 2 | * Copyright (c) 1997, 2021, Oracle and/or its affiliates. All rights reserved. |
| 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 | * |
| 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| 20 | * or visit www.oracle.com if you need additional information or have any |
| 21 | * questions. |
| 22 | * |
| 23 | */ |
| 24 | |
| 25 | #include "precompiled.hpp" |
| 26 | #include "jvm.h" |
| 27 | #include "cds/heapShared.hpp" |
| 28 | #include "classfile/classFileParser.hpp" |
| 29 | #include "classfile/classFileStream.hpp" |
| 30 | #include "classfile/classLoader.hpp" |
| 31 | #include "classfile/classLoaderData.inline.hpp" |
| 32 | #include "classfile/classLoaderDataGraph.inline.hpp" |
| 33 | #include "classfile/classLoaderExt.hpp" |
| 34 | #include "classfile/classLoadInfo.hpp" |
| 35 | #include "classfile/dictionary.hpp" |
| 36 | #include "classfile/javaClasses.inline.hpp" |
| 37 | #include "classfile/klassFactory.hpp" |
| 38 | #include "classfile/loaderConstraints.hpp" |
| 39 | #include "classfile/packageEntry.hpp" |
| 40 | #include "classfile/placeholders.hpp" |
| 41 | #include "classfile/protectionDomainCache.hpp" |
| 42 | #include "classfile/resolutionErrors.hpp" |
| 43 | #include "classfile/stringTable.hpp" |
| 44 | #include "classfile/symbolTable.hpp" |
| 45 | #include "classfile/systemDictionary.hpp" |
| 46 | #include "classfile/vmClasses.hpp" |
| 47 | #include "classfile/vmSymbols.hpp" |
| 48 | #include "code/codeCache.hpp" |
| 49 | #include "gc/shared/gcTraceTime.inline.hpp" |
| 50 | #include "interpreter/bootstrapInfo.hpp" |
| 51 | #include "jfr/jfrEvents.hpp" |
| 52 | #include "logging/log.hpp" |
| 53 | #include "logging/logStream.hpp" |
| 54 | #include "memory/metaspaceClosure.hpp" |
| 55 | #include "memory/oopFactory.hpp" |
| 56 | #include "memory/resourceArea.hpp" |
| 57 | #include "memory/universe.hpp" |
| 58 | #include "oops/access.inline.hpp" |
| 59 | #include "oops/instanceKlass.hpp" |
| 60 | #include "oops/klass.inline.hpp" |
| 61 | #include "oops/method.inline.hpp" |
| 62 | #include "oops/objArrayKlass.hpp" |
| 63 | #include "oops/objArrayOop.inline.hpp" |
| 64 | #include "oops/oop.inline.hpp" |
| 65 | #include "oops/oopHandle.inline.hpp" |
| 66 | #include "oops/symbol.hpp" |
| 67 | #include "oops/typeArrayKlass.hpp" |
| 68 | #include "prims/jvmtiExport.hpp" |
| 69 | #include "prims/methodHandles.hpp" |
| 70 | #include "runtime/arguments.hpp" |
| 71 | #include "runtime/handles.inline.hpp" |
| 72 | #include "runtime/java.hpp" |
| 73 | #include "runtime/javaCalls.hpp" |
| 74 | #include "runtime/mutexLocker.hpp" |
| 75 | #include "runtime/sharedRuntime.hpp" |
| 76 | #include "runtime/signature.hpp" |
| 77 | #include "services/classLoadingService.hpp" |
| 78 | #include "services/diagnosticCommand.hpp" |
| 79 | #include "services/finalizerService.hpp" |
| 80 | #include "services/threadService.hpp" |
| 81 | #include "utilities/macros.hpp" |
| 82 | #include "utilities/utf8.hpp" |
| 83 | #if INCLUDE_CDS1 |
| 84 | #include "classfile/systemDictionaryShared.hpp" |
| 85 | #endif |
| 86 | #if INCLUDE_JFR1 |
| 87 | #include "jfr/jfr.hpp" |
| 88 | #endif |
| 89 | |
| 90 | ResolutionErrorTable* SystemDictionary::_resolution_errors = NULL__null; |
| 91 | SymbolPropertyTable* SystemDictionary::_invoke_method_table = NULL__null; |
| 92 | ProtectionDomainCacheTable* SystemDictionary::_pd_cache_table = NULL__null; |
| 93 | |
| 94 | OopHandle SystemDictionary::_java_system_loader; |
| 95 | OopHandle SystemDictionary::_java_platform_loader; |
| 96 | |
| 97 | // Default ProtectionDomainCacheSize value |
| 98 | const int defaultProtectionDomainCacheSize = 1009; |
| 99 | |
| 100 | const int _resolution_error_size = 107; // number of entries in resolution error table |
| 101 | const int _invoke_method_size = 139; // number of entries in invoke method table |
| 102 | |
| 103 | // Hashtable holding placeholders for classes being loaded. |
| 104 | const int _placeholder_table_size = 1009; |
| 105 | static PlaceholderTable* _placeholders = NULL__null; |
| 106 | static PlaceholderTable* placeholders() { return _placeholders; } |
| 107 | |
| 108 | // Constraints on class loaders |
| 109 | const int _loader_constraint_size = 107; // number of entries in constraint table |
| 110 | static LoaderConstraintTable* _loader_constraints; |
| 111 | static LoaderConstraintTable* constraints() { return _loader_constraints; } |
| 112 | |
| 113 | // ---------------------------------------------------------------------------- |
| 114 | // Java-level SystemLoader and PlatformLoader |
| 115 | oop SystemDictionary::java_system_loader() { |
| 116 | return _java_system_loader.resolve(); |
| 117 | } |
| 118 | |
| 119 | oop SystemDictionary::java_platform_loader() { |
| 120 | return _java_platform_loader.resolve(); |
| 121 | } |
| 122 | |
| 123 | void SystemDictionary::compute_java_loaders(TRAPSJavaThread* __the_thread__) { |
| 124 | JavaValue result(T_OBJECT); |
| 125 | InstanceKlass* class_loader_klass = vmClasses::ClassLoader_klass(); |
| 126 | JavaCalls::call_static(&result, |
| 127 | class_loader_klass, |
| 128 | vmSymbols::getSystemClassLoader_name(), |
| 129 | vmSymbols::void_classloader_signature(), |
| 130 | CHECK__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return ; (void)(0); |
| 131 | |
| 132 | _java_system_loader = OopHandle(Universe::vm_global(), result.get_oop()); |
| 133 | |
| 134 | JavaCalls::call_static(&result, |
| 135 | class_loader_klass, |
| 136 | vmSymbols::getPlatformClassLoader_name(), |
| 137 | vmSymbols::void_classloader_signature(), |
| 138 | CHECK__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return ; (void)(0); |
| 139 | |
| 140 | _java_platform_loader = OopHandle(Universe::vm_global(), result.get_oop()); |
| 141 | } |
| 142 | |
| 143 | ClassLoaderData* SystemDictionary::register_loader(Handle class_loader, bool create_mirror_cld) { |
| 144 | if (create_mirror_cld) { |
| 145 | // Add a new class loader data to the graph. |
| 146 | return ClassLoaderDataGraph::add(class_loader, true); |
| 147 | } else { |
| 148 | return (class_loader() == NULL__null) ? ClassLoaderData::the_null_class_loader_data() : |
| 149 | ClassLoaderDataGraph::find_or_create(class_loader); |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | // ---------------------------------------------------------------------------- |
| 154 | // Parallel class loading check |
| 155 | |
| 156 | bool is_parallelCapable(Handle class_loader) { |
| 157 | if (class_loader.is_null()) return true; |
| 158 | return java_lang_ClassLoader::parallelCapable(class_loader()); |
| 159 | } |
| 160 | // ---------------------------------------------------------------------------- |
| 161 | // ParallelDefineClass flag does not apply to bootclass loader |
| 162 | bool is_parallelDefine(Handle class_loader) { |
| 163 | if (class_loader.is_null()) return false; |
| 164 | if (AllowParallelDefineClass && java_lang_ClassLoader::parallelCapable(class_loader())) { |
| 165 | return true; |
| 166 | } |
| 167 | return false; |
| 168 | } |
| 169 | |
| 170 | // Returns true if the passed class loader is the builtin application class loader |
| 171 | // or a custom system class loader. A customer system class loader can be |
| 172 | // specified via -Djava.system.class.loader. |
| 173 | bool SystemDictionary::is_system_class_loader(oop class_loader) { |
| 174 | if (class_loader == NULL__null) { |
| 175 | return false; |
| 176 | } |
| 177 | return (class_loader->klass() == vmClasses::jdk_internal_loader_ClassLoaders_AppClassLoader_klass() || |
| 178 | class_loader == _java_system_loader.peek()); |
| 179 | } |
| 180 | |
| 181 | // Returns true if the passed class loader is the platform class loader. |
| 182 | bool SystemDictionary::is_platform_class_loader(oop class_loader) { |
| 183 | if (class_loader == NULL__null) { |
| 184 | return false; |
| 185 | } |
| 186 | return (class_loader->klass() == vmClasses::jdk_internal_loader_ClassLoaders_PlatformClassLoader_klass()); |
| 187 | } |
| 188 | |
| 189 | Handle SystemDictionary::get_loader_lock_or_null(Handle class_loader) { |
| 190 | // If class_loader is NULL or parallelCapable, the JVM doesn't acquire a lock while loading. |
| 191 | if (is_parallelCapable(class_loader)) { |
| 192 | return Handle(); |
| 193 | } else { |
| 194 | return class_loader; |
| 195 | } |
| 196 | } |
| 197 | |
| 198 | // ---------------------------------------------------------------------------- |
| 199 | // Resolving of classes |
| 200 | |
| 201 | Symbol* SystemDictionary::class_name_symbol(const char* name, Symbol* exception, TRAPSJavaThread* __the_thread__) { |
| 202 | if (name == NULL__null) { |
| 203 | THROW_MSG_0(exception, "No class name given"){ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 203, exception, "No class name given"); return 0; }; |
| 204 | } |
| 205 | if ((int)strlen(name) > Symbol::max_length()) { |
| 206 | // It's impossible to create this class; the name cannot fit |
| 207 | // into the constant pool. |
| 208 | Exceptions::fthrow(THREAD_AND_LOCATION__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 208, exception, |
| 209 | "Class name exceeds maximum length of %d: %s", |
| 210 | Symbol::max_length(), |
| 211 | name); |
| 212 | return NULL__null; |
| 213 | } |
| 214 | // Callers should ensure that the name is never an illegal UTF8 string. |
| 215 | assert(UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false),do { if (!(UTF8::is_legal_utf8((const unsigned char*)name, (int )strlen(name), false))) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 216, "assert(" "UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false)" ") failed", "Class name is not a valid utf8 string."); ::breakpoint (); } } while (0) |
| 216 | "Class name is not a valid utf8 string.")do { if (!(UTF8::is_legal_utf8((const unsigned char*)name, (int )strlen(name), false))) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 216, "assert(" "UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false)" ") failed", "Class name is not a valid utf8 string."); ::breakpoint (); } } while (0); |
| 217 | |
| 218 | // Make a new symbol for the class name. |
| 219 | return SymbolTable::new_symbol(name); |
| 220 | } |
| 221 | |
| 222 | #ifdef ASSERT1 |
| 223 | // Used to verify that class loading succeeded in adding k to the dictionary. |
| 224 | void verify_dictionary_entry(Symbol* class_name, InstanceKlass* k) { |
| 225 | MutexLocker mu(SystemDictionary_lock); |
| 226 | ClassLoaderData* loader_data = k->class_loader_data(); |
| 227 | Dictionary* dictionary = loader_data->dictionary(); |
| 228 | assert(class_name == k->name(), "Must be the same")do { if (!(class_name == k->name())) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 228, "assert(" "class_name == k->name()" ") failed", "Must be the same" ); ::breakpoint(); } } while (0); |
| 229 | unsigned int name_hash = dictionary->compute_hash(class_name); |
| 230 | InstanceKlass* kk = dictionary->find_class(name_hash, class_name); |
| 231 | assert(kk == k, "should be present in dictionary")do { if (!(kk == k)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 231, "assert(" "kk == k" ") failed", "should be present in dictionary" ); ::breakpoint(); } } while (0); |
| 232 | } |
| 233 | #endif |
| 234 | |
| 235 | static void handle_resolution_exception(Symbol* class_name, bool throw_error, TRAPSJavaThread* __the_thread__) { |
| 236 | if (HAS_PENDING_EXCEPTION(((ThreadShadow*)__the_thread__)->has_pending_exception())) { |
| 237 | // If we have a pending exception we forward it to the caller, unless throw_error is true, |
| 238 | // in which case we have to check whether the pending exception is a ClassNotFoundException, |
| 239 | // and convert it to a NoClassDefFoundError and chain the original ClassNotFoundException. |
| 240 | if (throw_error && PENDING_EXCEPTION(((ThreadShadow*)__the_thread__)->pending_exception())->is_a(vmClasses::ClassNotFoundException_klass())) { |
| 241 | ResourceMark rm(THREAD__the_thread__); |
| 242 | Handle e(THREAD__the_thread__, PENDING_EXCEPTION(((ThreadShadow*)__the_thread__)->pending_exception())); |
| 243 | CLEAR_PENDING_EXCEPTION(((ThreadShadow*)__the_thread__)->clear_pending_exception( )); |
| 244 | THROW_MSG_CAUSE(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string(), e){ Exceptions::_throw_msg_cause(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 244, vmSymbols::java_lang_NoClassDefFoundError(), class_name ->as_C_string(), e); return; }; |
| 245 | } else { |
| 246 | return; // the caller will throw the incoming exception |
| 247 | } |
| 248 | } |
| 249 | // If the class is not found, ie, caller has checked that klass is NULL, throw the appropriate |
| 250 | // error or exception depending on the value of throw_error. |
| 251 | ResourceMark rm(THREAD__the_thread__); |
| 252 | if (throw_error) { |
| 253 | THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string()){ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 253, vmSymbols::java_lang_NoClassDefFoundError(), class_name ->as_C_string()); return; }; |
| 254 | } else { |
| 255 | THROW_MSG(vmSymbols::java_lang_ClassNotFoundException(), class_name->as_C_string()){ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 255, vmSymbols::java_lang_ClassNotFoundException(), class_name ->as_C_string()); return; }; |
| 256 | } |
| 257 | } |
| 258 | |
| 259 | // Forwards to resolve_or_null |
| 260 | |
| 261 | Klass* SystemDictionary::resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, |
| 262 | bool throw_error, TRAPSJavaThread* __the_thread__) { |
| 263 | Klass* klass = resolve_or_null(class_name, class_loader, protection_domain, THREAD__the_thread__); |
| 264 | // Check for pending exception or null klass, and throw exception |
| 265 | if (HAS_PENDING_EXCEPTION(((ThreadShadow*)__the_thread__)->has_pending_exception()) || klass == NULL__null) { |
| 266 | handle_resolution_exception(class_name, throw_error, CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 267 | } |
| 268 | return klass; |
| 269 | } |
| 270 | |
| 271 | // Forwards to resolve_array_class_or_null or resolve_instance_class_or_null |
| 272 | |
| 273 | Klass* SystemDictionary::resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPSJavaThread* __the_thread__) { |
| 274 | if (Signature::is_array(class_name)) { |
| 275 | return resolve_array_class_or_null(class_name, class_loader, protection_domain, THREAD__the_thread__); |
| 276 | } else { |
| 277 | return resolve_instance_class_or_null_helper(class_name, class_loader, protection_domain, THREAD__the_thread__); |
| 278 | } |
| 279 | } |
| 280 | |
| 281 | // name may be in the form of "java/lang/Object" or "Ljava/lang/Object;" |
| 282 | InstanceKlass* SystemDictionary::resolve_instance_class_or_null_helper(Symbol* class_name, |
| 283 | Handle class_loader, |
| 284 | Handle protection_domain, |
| 285 | TRAPSJavaThread* __the_thread__) { |
| 286 | assert(class_name != NULL && !Signature::is_array(class_name), "must be")do { if (!(class_name != __null && !Signature::is_array (class_name))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 286, "assert(" "class_name != __null && !Signature::is_array(class_name)" ") failed", "must be"); ::breakpoint(); } } while (0); |
| 287 | if (Signature::has_envelope(class_name)) { |
| 288 | ResourceMark rm(THREAD__the_thread__); |
| 289 | // Ignore wrapping L and ;. |
| 290 | TempNewSymbol name = SymbolTable::new_symbol(class_name->as_C_string() + 1, |
| 291 | class_name->utf8_length() - 2); |
| 292 | return resolve_instance_class_or_null(name, class_loader, protection_domain, THREAD__the_thread__); |
| 293 | } else { |
| 294 | return resolve_instance_class_or_null(class_name, class_loader, protection_domain, THREAD__the_thread__); |
| 295 | } |
| 296 | } |
| 297 | |
| 298 | // Forwards to resolve_instance_class_or_null |
| 299 | |
| 300 | Klass* SystemDictionary::resolve_array_class_or_null(Symbol* class_name, |
| 301 | Handle class_loader, |
| 302 | Handle protection_domain, |
| 303 | TRAPSJavaThread* __the_thread__) { |
| 304 | assert(Signature::is_array(class_name), "must be array")do { if (!(Signature::is_array(class_name))) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 304, "assert(" "Signature::is_array(class_name)" ") failed" , "must be array"); ::breakpoint(); } } while (0); |
| 305 | ResourceMark rm(THREAD__the_thread__); |
| 306 | SignatureStream ss(class_name, false); |
| 307 | int ndims = ss.skip_array_prefix(); // skip all '['s |
| 308 | Klass* k = NULL__null; |
| 309 | BasicType t = ss.type(); |
| 310 | if (ss.has_envelope()) { |
| 311 | Symbol* obj_class = ss.as_symbol(); |
| 312 | k = SystemDictionary::resolve_instance_class_or_null(obj_class, |
| 313 | class_loader, |
| 314 | protection_domain, |
| 315 | CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 316 | if (k != NULL__null) { |
| 317 | k = k->array_klass(ndims, CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 318 | } |
| 319 | } else { |
| 320 | k = Universe::typeArrayKlassObj(t); |
| 321 | k = TypeArrayKlass::cast(k)->array_klass(ndims, CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 322 | } |
| 323 | return k; |
| 324 | } |
| 325 | |
| 326 | static inline void log_circularity_error(Thread* thread, PlaceholderEntry* probe) { |
| 327 | LogTarget(Debug, class, load, placeholders)LogTargetImpl<LogLevel::Debug, (LogTag::_class), (LogTag:: _load), (LogTag::_placeholders), (LogTag::__NO_TAG), (LogTag:: __NO_TAG), (LogTag::__NO_TAG)> lt; |
| 328 | if (lt.is_enabled()) { |
| 329 | ResourceMark rm(thread); |
| 330 | LogStream ls(lt); |
| 331 | ls.print("ClassCircularityError detected for placeholder "); |
| 332 | probe->print_entry(&ls); |
| 333 | ls.cr(); |
| 334 | } |
| 335 | } |
| 336 | |
| 337 | // Must be called for any superclass or superinterface resolution |
| 338 | // during class definition to allow class circularity checking |
| 339 | // superinterface callers: |
| 340 | // parse_interfaces - from defineClass |
| 341 | // superclass callers: |
| 342 | // ClassFileParser - from defineClass |
| 343 | // load_shared_class - while loading a class from shared archive |
| 344 | // resolve_instance_class_or_null: |
| 345 | // via: handle_parallel_super_load |
| 346 | // when resolving a class that has an existing placeholder with |
| 347 | // a saved superclass [i.e. a defineClass is currently in progress] |
| 348 | // If another thread is trying to resolve the class, it must do |
| 349 | // superclass checks on its own thread to catch class circularity and |
| 350 | // to avoid deadlock. |
| 351 | // |
| 352 | // resolve_super_or_fail adds a LOAD_SUPER placeholder to the placeholder table before calling |
| 353 | // resolve_instance_class_or_null. ClassCircularityError is detected when a LOAD_SUPER or LOAD_INSTANCE |
| 354 | // placeholder for the same thread, class, classloader is found. |
| 355 | // This can be seen with logging option: -Xlog:class+load+placeholders=debug. |
| 356 | // |
| 357 | InstanceKlass* SystemDictionary::resolve_super_or_fail(Symbol* class_name, |
| 358 | Symbol* super_name, |
| 359 | Handle class_loader, |
| 360 | Handle protection_domain, |
| 361 | bool is_superclass, |
| 362 | TRAPSJavaThread* __the_thread__) { |
| 363 | |
| 364 | assert(super_name != NULL, "null superclass for resolving")do { if (!(super_name != __null)) { (*g_assert_poison) = 'X'; ; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 364, "assert(" "super_name != __null" ") failed", "null superclass for resolving" ); ::breakpoint(); } } while (0); |
| 365 | assert(!Signature::is_array(super_name), "invalid superclass name")do { if (!(!Signature::is_array(super_name))) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 365, "assert(" "!Signature::is_array(super_name)" ") failed" , "invalid superclass name"); ::breakpoint(); } } while (0); |
| 366 | #if INCLUDE_CDS1 |
| 367 | if (DumpSharedSpaces) { |
| 368 | // Special processing for handling UNREGISTERED shared classes. |
| 369 | InstanceKlass* k = SystemDictionaryShared::lookup_super_for_unregistered_class(class_name, |
| 370 | super_name, is_superclass); |
| 371 | if (k) { |
| 372 | return k; |
| 373 | } |
| 374 | } |
| 375 | #endif // INCLUDE_CDS |
| 376 | |
| 377 | // If klass is already loaded, just return the superclass or superinterface. |
| 378 | // Make sure there's a placeholder for the class_name before resolving. |
| 379 | // This is used as a claim that this thread is currently loading superclass/classloader |
| 380 | // and for ClassCircularity checks. |
| 381 | |
| 382 | ClassLoaderData* loader_data = class_loader_data(class_loader); |
| 383 | Dictionary* dictionary = loader_data->dictionary(); |
| 384 | unsigned int name_hash = dictionary->compute_hash(class_name); |
| 385 | assert(placeholders()->compute_hash(class_name) == name_hash, "they're the same hashcode")do { if (!(placeholders()->compute_hash(class_name) == name_hash )) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 385, "assert(" "placeholders()->compute_hash(class_name) == name_hash" ") failed", "they're the same hashcode"); ::breakpoint(); } } while (0); |
| 386 | |
| 387 | // can't throw error holding a lock |
| 388 | bool throw_circularity_error = false; |
| 389 | { |
| 390 | MutexLocker mu(THREAD__the_thread__, SystemDictionary_lock); |
| 391 | InstanceKlass* klassk = dictionary->find_class(name_hash, class_name); |
| 392 | InstanceKlass* quicksuperk; |
| 393 | // To support parallel loading: if class is done loading, just return the superclass |
| 394 | // if the super_name matches class->super()->name() and if the class loaders match. |
| 395 | // Otherwise, a LinkageError will be thrown later. |
| 396 | if (klassk != NULL__null && is_superclass && |
| 397 | ((quicksuperk = klassk->java_super()) != NULL__null) && |
| 398 | ((quicksuperk->name() == super_name) && |
| 399 | (quicksuperk->class_loader() == class_loader()))) { |
| 400 | return quicksuperk; |
| 401 | } else { |
| 402 | // Must check ClassCircularity before checking if superclass is already loaded. |
| 403 | PlaceholderEntry* probe = placeholders()->get_entry(name_hash, class_name, loader_data); |
| 404 | if (probe && probe->check_seen_thread(THREAD__the_thread__, PlaceholderTable::LOAD_SUPER)) { |
| 405 | log_circularity_error(THREAD__the_thread__, probe); |
| 406 | throw_circularity_error = true; |
| 407 | } |
| 408 | } |
| 409 | |
| 410 | if (!throw_circularity_error) { |
| 411 | // Be careful not to exit resolve_super without removing this placeholder. |
| 412 | PlaceholderEntry* newprobe = placeholders()->find_and_add(name_hash, |
| 413 | class_name, |
| 414 | loader_data, |
| 415 | PlaceholderTable::LOAD_SUPER, |
| 416 | super_name, THREAD__the_thread__); |
| 417 | } |
| 418 | } |
| 419 | |
| 420 | if (throw_circularity_error) { |
| 421 | ResourceMark rm(THREAD__the_thread__); |
| 422 | THROW_MSG_NULL(vmSymbols::java_lang_ClassCircularityError(), class_name->as_C_string()){ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 422, vmSymbols::java_lang_ClassCircularityError(), class_name ->as_C_string()); return __null; }; |
| 423 | } |
| 424 | |
| 425 | // Resolve the superclass or superinterface, check results on return |
| 426 | InstanceKlass* superk = |
| 427 | SystemDictionary::resolve_instance_class_or_null_helper(super_name, |
| 428 | class_loader, |
| 429 | protection_domain, |
| 430 | THREAD__the_thread__); |
| 431 | |
| 432 | // Clean up placeholder entry. |
| 433 | { |
| 434 | MutexLocker mu(THREAD__the_thread__, SystemDictionary_lock); |
| 435 | placeholders()->find_and_remove(name_hash, class_name, loader_data, PlaceholderTable::LOAD_SUPER, THREAD__the_thread__); |
| 436 | SystemDictionary_lock->notify_all(); |
| 437 | } |
| 438 | |
| 439 | // Check for pending exception or null superk, and throw exception |
| 440 | if (HAS_PENDING_EXCEPTION(((ThreadShadow*)__the_thread__)->has_pending_exception()) || superk == NULL__null) { |
| 441 | handle_resolution_exception(super_name, true, CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 442 | } |
| 443 | |
| 444 | return superk; |
| 445 | } |
| 446 | |
| 447 | // We only get here if this thread finds that another thread |
| 448 | // has already claimed the placeholder token for the current operation, |
| 449 | // but that other thread either never owned or gave up the |
| 450 | // object lock |
| 451 | // Waits on SystemDictionary_lock to indicate placeholder table updated |
| 452 | // On return, caller must recheck placeholder table state |
| 453 | // |
| 454 | // We only get here if |
| 455 | // 1) custom classLoader, i.e. not bootstrap classloader |
| 456 | // 2) custom classLoader has broken the class loader objectLock |
| 457 | // so another thread got here in parallel |
| 458 | // |
| 459 | // lockObject must be held. |
| 460 | // Complicated dance due to lock ordering: |
| 461 | // Must first release the classloader object lock to |
| 462 | // allow initial definer to complete the class definition |
| 463 | // and to avoid deadlock |
| 464 | // Reclaim classloader lock object with same original recursion count |
| 465 | // Must release SystemDictionary_lock after notify, since |
| 466 | // class loader lock must be claimed before SystemDictionary_lock |
| 467 | // to prevent deadlocks |
| 468 | // |
| 469 | // The notify allows applications that did an untimed wait() on |
| 470 | // the classloader object lock to not hang. |
| 471 | static void double_lock_wait(JavaThread* thread, Handle lockObject) { |
| 472 | assert_lock_strong(SystemDictionary_lock); |
| 473 | |
| 474 | assert(lockObject() != NULL, "lockObject must be non-NULL")do { if (!(lockObject() != __null)) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 474, "assert(" "lockObject() != __null" ") failed", "lockObject must be non-NULL" ); ::breakpoint(); } } while (0); |
| 475 | bool calledholdinglock |
| 476 | = ObjectSynchronizer::current_thread_holds_lock(thread, lockObject); |
| 477 | assert(calledholdinglock, "must hold lock for notify")do { if (!(calledholdinglock)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 477, "assert(" "calledholdinglock" ") failed", "must hold lock for notify" ); ::breakpoint(); } } while (0); |
| 478 | assert(!is_parallelCapable(lockObject), "lockObject must not be parallelCapable")do { if (!(!is_parallelCapable(lockObject))) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 478, "assert(" "!is_parallelCapable(lockObject)" ") failed" , "lockObject must not be parallelCapable"); ::breakpoint(); } } while (0); |
| 479 | // These don't throw exceptions. |
| 480 | ObjectSynchronizer::notifyall(lockObject, thread); |
| 481 | intx recursions = ObjectSynchronizer::complete_exit(lockObject, thread); |
| 482 | SystemDictionary_lock->wait(); |
| 483 | SystemDictionary_lock->unlock(); |
| 484 | ObjectSynchronizer::reenter(lockObject, recursions, thread); |
| 485 | SystemDictionary_lock->lock(); |
| 486 | } |
| 487 | |
| 488 | // If the class in is in the placeholder table, class loading is in progress. |
| 489 | // For cases where the application changes threads to load classes, it |
| 490 | // is critical to ClassCircularity detection that we try loading |
| 491 | // the superclass on the new thread internally, so we do parallel |
| 492 | // superclass loading here. This avoids deadlock for ClassCircularity |
| 493 | // detection for parallelCapable class loaders that lock on a per-class lock. |
| 494 | static void handle_parallel_super_load(Symbol* name, |
| 495 | Symbol* superclassname, |
| 496 | Handle class_loader, |
| 497 | Handle protection_domain, TRAPSJavaThread* __the_thread__) { |
| 498 | |
| 499 | // superk is not used; resolve_super_or_fail is called for circularity check only. |
| 500 | Klass* superk = SystemDictionary::resolve_super_or_fail(name, |
| 501 | superclassname, |
| 502 | class_loader, |
| 503 | protection_domain, |
| 504 | true, |
| 505 | CHECK__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return ; (void)(0); |
| 506 | } |
| 507 | |
| 508 | // parallelCapable class loaders do NOT wait for parallel superclass loads to complete |
| 509 | // Serial class loaders and bootstrap classloader do wait for superclass loads |
| 510 | static bool should_wait_for_loading(Handle class_loader) { |
| 511 | return class_loader.is_null() || !is_parallelCapable(class_loader); |
| 512 | } |
| 513 | |
| 514 | // For bootstrap and non-parallelCapable class loaders, check and wait for |
| 515 | // another thread to complete loading this class. |
| 516 | InstanceKlass* SystemDictionary::handle_parallel_loading(JavaThread* current, |
| 517 | unsigned int name_hash, |
| 518 | Symbol* name, |
| 519 | ClassLoaderData* loader_data, |
| 520 | Handle lockObject, |
| 521 | bool* throw_circularity_error) { |
| 522 | PlaceholderEntry* oldprobe = placeholders()->get_entry(name_hash, name, loader_data); |
| 523 | if (oldprobe != NULL__null) { |
| 524 | // only need check_seen_thread once, not on each loop |
| 525 | // 6341374 java/lang/Instrument with -Xcomp |
| 526 | if (oldprobe->check_seen_thread(current, PlaceholderTable::LOAD_INSTANCE)) { |
| 527 | log_circularity_error(current, oldprobe); |
| 528 | *throw_circularity_error = true; |
| 529 | return NULL__null; |
| 530 | } else { |
| 531 | // Wait until the first thread has finished loading this class. Also wait until all the |
| 532 | // threads trying to load its superclass have removed their placeholders. |
| 533 | while (oldprobe != NULL__null && |
| 534 | (oldprobe->instance_load_in_progress() || oldprobe->super_load_in_progress())) { |
| 535 | |
| 536 | // We only get here if the application has released the |
| 537 | // classloader lock when another thread was in the middle of loading a |
| 538 | // superclass/superinterface for this class, and now |
| 539 | // this thread is also trying to load this class. |
| 540 | // To minimize surprises, the first thread that started to |
| 541 | // load a class should be the one to complete the loading |
| 542 | // with the classfile it initially expected. |
| 543 | // This logic has the current thread wait once it has done |
| 544 | // all the superclass/superinterface loading it can, until |
| 545 | // the original thread completes the class loading or fails |
| 546 | // If it completes we will use the resulting InstanceKlass |
| 547 | // which we will find below in the systemDictionary. |
| 548 | oldprobe = NULL__null; // Other thread could delete this placeholder entry |
| 549 | |
| 550 | if (lockObject.is_null()) { |
| 551 | SystemDictionary_lock->wait(); |
| 552 | } else { |
| 553 | double_lock_wait(current, lockObject); |
| 554 | } |
| 555 | |
| 556 | // Check if classloading completed while we were waiting |
| 557 | InstanceKlass* check = loader_data->dictionary()->find_class(name_hash, name); |
| 558 | if (check != NULL__null) { |
| 559 | // Klass is already loaded, so just return it |
| 560 | return check; |
| 561 | } |
| 562 | // check if other thread failed to load and cleaned up |
| 563 | oldprobe = placeholders()->get_entry(name_hash, name, loader_data); |
| 564 | } |
| 565 | } |
| 566 | } |
| 567 | return NULL__null; |
| 568 | } |
| 569 | |
| 570 | void SystemDictionary::post_class_load_event(EventClassLoad* event, const InstanceKlass* k, const ClassLoaderData* init_cld) { |
| 571 | assert(event != NULL, "invariant")do { if (!(event != __null)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 571, "assert(" "event != __null" ") failed", "invariant"); :: breakpoint(); } } while (0); |
| 572 | assert(k != NULL, "invariant")do { if (!(k != __null)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 572, "assert(" "k != __null" ") failed", "invariant"); ::breakpoint (); } } while (0); |
| 573 | assert(event->should_commit(), "invariant")do { if (!(event->should_commit())) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 573, "assert(" "event->should_commit()" ") failed", "invariant" ); ::breakpoint(); } } while (0); |
| 574 | event->set_loadedClass(k); |
| 575 | event->set_definingClassLoader(k->class_loader_data()); |
| 576 | event->set_initiatingClassLoader(init_cld); |
| 577 | event->commit(); |
| 578 | } |
| 579 | |
| 580 | // SystemDictionary::resolve_instance_class_or_null is the main function for class name resolution. |
| 581 | // After checking if the InstanceKlass already exists, it checks for ClassCircularityError and |
| 582 | // whether the thread must wait for loading in parallel. It eventually calls load_instance_class, |
| 583 | // which will load the class via the bootstrap loader or call ClassLoader.loadClass(). |
| 584 | // This can return NULL, an exception or an InstanceKlass. |
| 585 | InstanceKlass* SystemDictionary::resolve_instance_class_or_null(Symbol* name, |
| 586 | Handle class_loader, |
| 587 | Handle protection_domain, |
| 588 | TRAPSJavaThread* __the_thread__) { |
| 589 | // name must be in the form of "java/lang/Object" -- cannot be "Ljava/lang/Object;" |
| 590 | assert(name != NULL && !Signature::is_array(name) &&do { if (!(name != __null && !Signature::is_array(name ) && !Signature::has_envelope(name))) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 591, "assert(" "name != __null && !Signature::is_array(name) && !Signature::has_envelope(name)" ") failed", "invalid class name"); ::breakpoint(); } } while (0) |
| 591 | !Signature::has_envelope(name), "invalid class name")do { if (!(name != __null && !Signature::is_array(name ) && !Signature::has_envelope(name))) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 591, "assert(" "name != __null && !Signature::is_array(name) && !Signature::has_envelope(name)" ") failed", "invalid class name"); ::breakpoint(); } } while (0); |
| 592 | |
| 593 | EventClassLoad class_load_start_event; |
| 594 | |
| 595 | HandleMark hm(THREAD__the_thread__); |
| 596 | |
| 597 | // Fix for 4474172; see evaluation for more details |
| 598 | class_loader = Handle(THREAD__the_thread__, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); |
| 599 | ClassLoaderData* loader_data = register_loader(class_loader); |
| 600 | Dictionary* dictionary = loader_data->dictionary(); |
| 601 | unsigned int name_hash = dictionary->compute_hash(name); |
| 602 | |
| 603 | // Do lookup to see if class already exists and the protection domain |
| 604 | // has the right access. |
| 605 | // This call uses find which checks protection domain already matches |
| 606 | // All subsequent calls use find_class, and set loaded_class so that |
| 607 | // before we return a result, we call out to java to check for valid protection domain. |
| 608 | InstanceKlass* probe = dictionary->find(name_hash, name, protection_domain); |
| 609 | if (probe != NULL__null) return probe; |
| 610 | |
| 611 | // Non-bootstrap class loaders will call out to class loader and |
| 612 | // define via jvm/jni_DefineClass which will acquire the |
| 613 | // class loader object lock to protect against multiple threads |
| 614 | // defining the class in parallel by accident. |
| 615 | // This lock must be acquired here so the waiter will find |
| 616 | // any successful result in the SystemDictionary and not attempt |
| 617 | // the define. |
| 618 | // ParallelCapable class loaders and the bootstrap classloader |
| 619 | // do not acquire lock here. |
| 620 | Handle lockObject = get_loader_lock_or_null(class_loader); |
| 621 | ObjectLocker ol(lockObject, THREAD__the_thread__); |
| 622 | |
| 623 | bool super_load_in_progress = false; |
| 624 | InstanceKlass* loaded_class = NULL__null; |
| 625 | Symbol* superclassname = NULL__null; |
| 626 | |
| 627 | assert(THREAD->can_call_java(),do { if (!(__the_thread__->can_call_java())) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 630, "assert(" "__the_thread__->can_call_java()" ") failed" , "can not load classes with compiler thread: class=%s, classloader=%s" , name->as_C_string(), class_loader.is_null() ? "null" : class_loader ->klass()->name()->as_C_string()); ::breakpoint(); } } while (0) |
| 628 | "can not load classes with compiler thread: class=%s, classloader=%s",do { if (!(__the_thread__->can_call_java())) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 630, "assert(" "__the_thread__->can_call_java()" ") failed" , "can not load classes with compiler thread: class=%s, classloader=%s" , name->as_C_string(), class_loader.is_null() ? "null" : class_loader ->klass()->name()->as_C_string()); ::breakpoint(); } } while (0) |
| 629 | name->as_C_string(),do { if (!(__the_thread__->can_call_java())) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 630, "assert(" "__the_thread__->can_call_java()" ") failed" , "can not load classes with compiler thread: class=%s, classloader=%s" , name->as_C_string(), class_loader.is_null() ? "null" : class_loader ->klass()->name()->as_C_string()); ::breakpoint(); } } while (0) |
| 630 | class_loader.is_null() ? "null" : class_loader->klass()->name()->as_C_string())do { if (!(__the_thread__->can_call_java())) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 630, "assert(" "__the_thread__->can_call_java()" ") failed" , "can not load classes with compiler thread: class=%s, classloader=%s" , name->as_C_string(), class_loader.is_null() ? "null" : class_loader ->klass()->name()->as_C_string()); ::breakpoint(); } } while (0); |
| 631 | |
| 632 | assert(placeholders()->compute_hash(name) == name_hash, "they're the same hashcode")do { if (!(placeholders()->compute_hash(name) == name_hash )) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 632, "assert(" "placeholders()->compute_hash(name) == name_hash" ") failed", "they're the same hashcode"); ::breakpoint(); } } while (0); |
| 633 | |
| 634 | // Check again (after locking) if the class already exists in SystemDictionary |
| 635 | { |
| 636 | MutexLocker mu(THREAD__the_thread__, SystemDictionary_lock); |
| 637 | InstanceKlass* check = dictionary->find_class(name_hash, name); |
| 638 | if (check != NULL__null) { |
| 639 | // InstanceKlass is already loaded, but we still need to check protection domain below. |
| 640 | loaded_class = check; |
| 641 | } else { |
| 642 | PlaceholderEntry* placeholder = placeholders()->get_entry(name_hash, name, loader_data); |
| 643 | if (placeholder != NULL__null && placeholder->super_load_in_progress()) { |
| 644 | super_load_in_progress = true; |
| 645 | superclassname = placeholder->supername(); |
| 646 | assert(superclassname != NULL, "superclass has to have a name")do { if (!(superclassname != __null)) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 646, "assert(" "superclassname != __null" ") failed", "superclass has to have a name" ); ::breakpoint(); } } while (0); |
| 647 | } |
| 648 | } |
| 649 | } |
| 650 | |
| 651 | // If the class is in the placeholder table with super_class set, |
| 652 | // handle superclass loading in progress. |
| 653 | if (super_load_in_progress) { |
| 654 | handle_parallel_super_load(name, superclassname, |
| 655 | class_loader, |
| 656 | protection_domain, |
| 657 | CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 658 | } |
| 659 | |
| 660 | bool throw_circularity_error = false; |
| 661 | if (loaded_class == NULL__null) { |
| 662 | bool load_placeholder_added = false; |
| 663 | |
| 664 | // Add placeholder entry to record loading instance class |
| 665 | // Four cases: |
| 666 | // case 1. Bootstrap classloader |
| 667 | // This classloader supports parallelism at the classloader level |
| 668 | // but only allows a single thread to load a class/classloader pair. |
| 669 | // The LOAD_INSTANCE placeholder is the mechanism for mutual exclusion. |
| 670 | // case 2. parallelCapable user level classloaders |
| 671 | // These class loaders lock a per-class object lock when ClassLoader.loadClass() |
| 672 | // is called. A LOAD_INSTANCE placeholder isn't used for mutual exclusion. |
| 673 | // case 3. traditional classloaders that rely on the classloader object lock |
| 674 | // There should be no need for need for LOAD_INSTANCE, except: |
| 675 | // case 4. traditional class loaders that break the classloader object lock |
| 676 | // as a legacy deadlock workaround. Detection of this case requires that |
| 677 | // this check is done while holding the classloader object lock, |
| 678 | // and that lock is still held when calling classloader's loadClass. |
| 679 | // For these classloaders, we ensure that the first requestor |
| 680 | // completes the load and other requestors wait for completion. |
| 681 | { |
| 682 | MutexLocker mu(THREAD__the_thread__, SystemDictionary_lock); |
| 683 | if (should_wait_for_loading(class_loader)) { |
| 684 | loaded_class = handle_parallel_loading(THREAD__the_thread__, |
| 685 | name_hash, |
| 686 | name, |
| 687 | loader_data, |
| 688 | lockObject, |
| 689 | &throw_circularity_error); |
| 690 | } |
| 691 | |
| 692 | // Recheck if the class has been loaded for all class loader cases and |
| 693 | // add a LOAD_INSTANCE placeholder while holding the SystemDictionary_lock. |
| 694 | if (!throw_circularity_error && loaded_class == NULL__null) { |
| 695 | InstanceKlass* check = dictionary->find_class(name_hash, name); |
| 696 | if (check != NULL__null) { |
| 697 | loaded_class = check; |
| 698 | } else if (should_wait_for_loading(class_loader)) { |
| 699 | // Add the LOAD_INSTANCE token. Threads will wait on loading to complete for this thread. |
| 700 | PlaceholderEntry* newprobe = placeholders()->find_and_add(name_hash, name, loader_data, |
Value stored to 'newprobe' during its initialization is never read | |
| 701 | PlaceholderTable::LOAD_INSTANCE, |
| 702 | NULL__null, |
| 703 | THREAD__the_thread__); |
| 704 | load_placeholder_added = true; |
| 705 | } |
| 706 | } |
| 707 | } |
| 708 | |
| 709 | // Must throw error outside of owning lock |
| 710 | if (throw_circularity_error) { |
| 711 | assert(!HAS_PENDING_EXCEPTION && !load_placeholder_added, "circularity error cleanup")do { if (!(!(((ThreadShadow*)__the_thread__)->has_pending_exception ()) && !load_placeholder_added)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 711, "assert(" "!(((ThreadShadow*)__the_thread__)->has_pending_exception()) && !load_placeholder_added" ") failed", "circularity error cleanup"); ::breakpoint(); } } while (0); |
| 712 | ResourceMark rm(THREAD__the_thread__); |
| 713 | THROW_MSG_NULL(vmSymbols::java_lang_ClassCircularityError(), name->as_C_string()){ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 713, vmSymbols::java_lang_ClassCircularityError(), name-> as_C_string()); return __null; }; |
| 714 | } |
| 715 | |
| 716 | // Be careful when modifying this code: once you have run |
| 717 | // placeholders()->find_and_add(PlaceholderTable::LOAD_INSTANCE), |
| 718 | // you need to find_and_remove it before returning. |
| 719 | // So be careful to not exit with a CHECK_ macro between these calls. |
| 720 | |
| 721 | if (loaded_class == NULL__null) { |
| 722 | // Do actual loading |
| 723 | loaded_class = load_instance_class(name_hash, name, class_loader, THREAD__the_thread__); |
| 724 | } |
| 725 | |
| 726 | if (load_placeholder_added) { |
| 727 | // clean up placeholder entries for LOAD_INSTANCE success or error |
| 728 | // This brackets the SystemDictionary updates for both defining |
| 729 | // and initiating loaders |
| 730 | MutexLocker mu(THREAD__the_thread__, SystemDictionary_lock); |
| 731 | placeholders()->find_and_remove(name_hash, name, loader_data, PlaceholderTable::LOAD_INSTANCE, THREAD__the_thread__); |
| 732 | SystemDictionary_lock->notify_all(); |
| 733 | } |
| 734 | } |
| 735 | |
| 736 | if (HAS_PENDING_EXCEPTION(((ThreadShadow*)__the_thread__)->has_pending_exception()) || loaded_class == NULL__null) { |
| 737 | return NULL__null; |
| 738 | } |
| 739 | |
| 740 | if (class_load_start_event.should_commit()) { |
| 741 | post_class_load_event(&class_load_start_event, loaded_class, loader_data); |
| 742 | } |
| 743 | |
| 744 | // Make sure we have the right class in the dictionary |
| 745 | DEBUG_ONLY(verify_dictionary_entry(name, loaded_class))verify_dictionary_entry(name, loaded_class); |
| 746 | |
| 747 | // Check if the protection domain is present it has the right access |
| 748 | if (protection_domain() != NULL__null) { |
| 749 | // Verify protection domain. If it fails an exception is thrown |
| 750 | dictionary->validate_protection_domain(name_hash, loaded_class, class_loader, protection_domain, CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 751 | } |
| 752 | |
| 753 | return loaded_class; |
| 754 | } |
| 755 | |
| 756 | |
| 757 | // This routine does not lock the system dictionary. |
| 758 | // |
| 759 | // Since readers don't hold a lock, we must make sure that system |
| 760 | // dictionary entries are added to in a safe way (all links must |
| 761 | // be updated in an MT-safe manner). All entries are removed during class |
| 762 | // unloading, when this class loader is no longer referenced. |
| 763 | // |
| 764 | // Callers should be aware that an entry could be added just after |
| 765 | // _dictionary->bucket(index) is read here, so the caller will not see |
| 766 | // the new entry. |
| 767 | |
| 768 | InstanceKlass* SystemDictionary::find_instance_klass(Symbol* class_name, |
| 769 | Handle class_loader, |
| 770 | Handle protection_domain) { |
| 771 | |
| 772 | // The result of this call should be consistent with the result |
| 773 | // of the call to resolve_instance_class_or_null(). |
| 774 | // See evaluation 6790209 and 4474172 for more details. |
| 775 | oop class_loader_oop = java_lang_ClassLoader::non_reflection_class_loader(class_loader()); |
| 776 | ClassLoaderData* loader_data = ClassLoaderData::class_loader_data_or_null(class_loader_oop); |
| 777 | |
| 778 | if (loader_data == NULL__null) { |
| 779 | // If the ClassLoaderData has not been setup, |
| 780 | // then the class loader has no entries in the dictionary. |
| 781 | return NULL__null; |
| 782 | } |
| 783 | |
| 784 | Dictionary* dictionary = loader_data->dictionary(); |
| 785 | unsigned int name_hash = dictionary->compute_hash(class_name); |
| 786 | return dictionary->find(name_hash, class_name, protection_domain); |
| 787 | } |
| 788 | |
| 789 | // Look for a loaded instance or array klass by name. Do not do any loading. |
| 790 | // return NULL in case of error. |
| 791 | Klass* SystemDictionary::find_instance_or_array_klass(Symbol* class_name, |
| 792 | Handle class_loader, |
| 793 | Handle protection_domain) { |
| 794 | Klass* k = NULL__null; |
| 795 | assert(class_name != NULL, "class name must be non NULL")do { if (!(class_name != __null)) { (*g_assert_poison) = 'X'; ; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 795, "assert(" "class_name != __null" ") failed", "class name must be non NULL" ); ::breakpoint(); } } while (0); |
| 796 | |
| 797 | if (Signature::is_array(class_name)) { |
| 798 | // The name refers to an array. Parse the name. |
| 799 | // dimension and object_key in FieldArrayInfo are assigned as a |
| 800 | // side-effect of this call |
| 801 | SignatureStream ss(class_name, false); |
| 802 | int ndims = ss.skip_array_prefix(); // skip all '['s |
| 803 | BasicType t = ss.type(); |
| 804 | if (t != T_OBJECT) { |
| 805 | k = Universe::typeArrayKlassObj(t); |
| 806 | } else { |
| 807 | k = SystemDictionary::find_instance_klass(ss.as_symbol(), class_loader, protection_domain); |
| 808 | } |
| 809 | if (k != NULL__null) { |
| 810 | k = k->array_klass_or_null(ndims); |
| 811 | } |
| 812 | } else { |
| 813 | k = find_instance_klass(class_name, class_loader, protection_domain); |
| 814 | } |
| 815 | return k; |
| 816 | } |
| 817 | |
| 818 | // Note: this method is much like resolve_class_from_stream, but |
| 819 | // does not publish the classes in the SystemDictionary. |
| 820 | // Handles Lookup.defineClass hidden. |
| 821 | InstanceKlass* SystemDictionary::resolve_hidden_class_from_stream( |
| 822 | ClassFileStream* st, |
| 823 | Symbol* class_name, |
| 824 | Handle class_loader, |
| 825 | const ClassLoadInfo& cl_info, |
| 826 | TRAPSJavaThread* __the_thread__) { |
| 827 | |
| 828 | EventClassLoad class_load_start_event; |
| 829 | ClassLoaderData* loader_data; |
| 830 | |
| 831 | // - for hidden classes that are not strong: create a new CLD that has a class holder and |
| 832 | // whose loader is the Lookup class's loader. |
| 833 | // - for hidden class: add the class to the Lookup class's loader's CLD. |
| 834 | assert (cl_info.is_hidden(), "only used for hidden classes")do { if (!(cl_info.is_hidden())) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 834, "assert(" "cl_info.is_hidden()" ") failed", "only used for hidden classes" ); ::breakpoint(); } } while (0); |
| 835 | bool create_mirror_cld = !cl_info.is_strong_hidden(); |
| 836 | loader_data = register_loader(class_loader, create_mirror_cld); |
| 837 | |
| 838 | assert(st != NULL, "invariant")do { if (!(st != __null)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 838, "assert(" "st != __null" ") failed", "invariant"); ::breakpoint (); } } while (0); |
| 839 | assert(st->need_verify(), "invariant")do { if (!(st->need_verify())) { (*g_assert_poison) = 'X'; ; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 839, "assert(" "st->need_verify()" ") failed", "invariant" ); ::breakpoint(); } } while (0); |
| 840 | |
| 841 | // Parse stream and create a klass. |
| 842 | InstanceKlass* k = KlassFactory::create_from_stream(st, |
| 843 | class_name, |
| 844 | loader_data, |
| 845 | cl_info, |
| 846 | CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 847 | assert(k != NULL, "no klass created")do { if (!(k != __null)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 847, "assert(" "k != __null" ") failed", "no klass created" ); ::breakpoint(); } } while (0); |
| 848 | |
| 849 | // Hidden classes that are not strong must update ClassLoaderData holder |
| 850 | // so that they can be unloaded when the mirror is no longer referenced. |
| 851 | if (!cl_info.is_strong_hidden()) { |
| 852 | k->class_loader_data()->initialize_holder(Handle(THREAD__the_thread__, k->java_mirror())); |
| 853 | } |
| 854 | |
| 855 | { |
| 856 | MutexLocker mu_r(THREAD__the_thread__, Compile_lock); |
| 857 | // Add to class hierarchy, and do possible deoptimizations. |
| 858 | add_to_hierarchy(k); |
| 859 | // But, do not add to dictionary. |
| 860 | } |
| 861 | |
| 862 | k->link_class(CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 863 | |
| 864 | // notify jvmti |
| 865 | if (JvmtiExport::should_post_class_load()) { |
| 866 | JvmtiExport::post_class_load(THREAD__the_thread__, k); |
| 867 | } |
| 868 | if (class_load_start_event.should_commit()) { |
| 869 | post_class_load_event(&class_load_start_event, k, loader_data); |
| 870 | } |
| 871 | |
| 872 | return k; |
| 873 | } |
| 874 | |
| 875 | // Add a klass to the system from a stream (called by jni_DefineClass and |
| 876 | // JVM_DefineClass). |
| 877 | // Note: class_name can be NULL. In that case we do not know the name of |
| 878 | // the class until we have parsed the stream. |
| 879 | // This function either returns an InstanceKlass or throws an exception. It does |
| 880 | // not return NULL without a pending exception. |
| 881 | InstanceKlass* SystemDictionary::resolve_class_from_stream( |
| 882 | ClassFileStream* st, |
| 883 | Symbol* class_name, |
| 884 | Handle class_loader, |
| 885 | const ClassLoadInfo& cl_info, |
| 886 | TRAPSJavaThread* __the_thread__) { |
| 887 | |
| 888 | HandleMark hm(THREAD__the_thread__); |
| 889 | |
| 890 | ClassLoaderData* loader_data = register_loader(class_loader); |
| 891 | |
| 892 | // Classloaders that support parallelism, e.g. bootstrap classloader, |
| 893 | // do not acquire lock here |
| 894 | Handle lockObject = get_loader_lock_or_null(class_loader); |
| 895 | ObjectLocker ol(lockObject, THREAD__the_thread__); |
| 896 | |
| 897 | // Parse the stream and create a klass. |
| 898 | // Note that we do this even though this klass might |
| 899 | // already be present in the SystemDictionary, otherwise we would not |
| 900 | // throw potential ClassFormatErrors. |
| 901 | InstanceKlass* k = NULL__null; |
| 902 | |
| 903 | #if INCLUDE_CDS1 |
| 904 | if (!DumpSharedSpaces) { |
| 905 | k = SystemDictionaryShared::lookup_from_stream(class_name, |
| 906 | class_loader, |
| 907 | cl_info.protection_domain(), |
| 908 | st, |
| 909 | CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 910 | } |
| 911 | #endif |
| 912 | |
| 913 | if (k == NULL__null) { |
| 914 | k = KlassFactory::create_from_stream(st, class_name, loader_data, cl_info, CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 915 | } |
| 916 | |
| 917 | assert(k != NULL, "no klass created")do { if (!(k != __null)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 917, "assert(" "k != __null" ") failed", "no klass created" ); ::breakpoint(); } } while (0); |
| 918 | Symbol* h_name = k->name(); |
| 919 | assert(class_name == NULL || class_name == h_name, "name mismatch")do { if (!(class_name == __null || class_name == h_name)) { ( *g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 919, "assert(" "class_name == __null || class_name == h_name" ") failed", "name mismatch"); ::breakpoint(); } } while (0); |
| 920 | |
| 921 | // Add class just loaded |
| 922 | // If a class loader supports parallel classloading, handle parallel define requests. |
| 923 | // find_or_define_instance_class may return a different InstanceKlass, |
| 924 | // in which case the old k would be deallocated |
| 925 | if (is_parallelCapable(class_loader)) { |
| 926 | k = find_or_define_instance_class(h_name, class_loader, k, CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 927 | } else { |
| 928 | define_instance_class(k, class_loader, THREAD__the_thread__); |
| 929 | |
| 930 | // If defining the class throws an exception register 'k' for cleanup. |
| 931 | if (HAS_PENDING_EXCEPTION(((ThreadShadow*)__the_thread__)->has_pending_exception())) { |
| 932 | assert(k != NULL, "Must have an instance klass here!")do { if (!(k != __null)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 932, "assert(" "k != __null" ") failed", "Must have an instance klass here!" ); ::breakpoint(); } } while (0); |
| 933 | loader_data->add_to_deallocate_list(k); |
| 934 | return NULL__null; |
| 935 | } |
| 936 | } |
| 937 | |
| 938 | // Make sure we have an entry in the SystemDictionary on success |
| 939 | DEBUG_ONLY(verify_dictionary_entry(h_name, k))verify_dictionary_entry(h_name, k); |
| 940 | |
| 941 | return k; |
| 942 | } |
| 943 | |
| 944 | InstanceKlass* SystemDictionary::resolve_from_stream(ClassFileStream* st, |
| 945 | Symbol* class_name, |
| 946 | Handle class_loader, |
| 947 | const ClassLoadInfo& cl_info, |
| 948 | TRAPSJavaThread* __the_thread__) { |
| 949 | if (cl_info.is_hidden()) { |
| 950 | return resolve_hidden_class_from_stream(st, class_name, class_loader, cl_info, CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 951 | } else { |
| 952 | return resolve_class_from_stream(st, class_name, class_loader, cl_info, CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 953 | } |
| 954 | } |
| 955 | |
| 956 | |
| 957 | #if INCLUDE_CDS1 |
| 958 | // Check if a shared class can be loaded by the specific classloader. |
| 959 | bool SystemDictionary::is_shared_class_visible(Symbol* class_name, |
| 960 | InstanceKlass* ik, |
| 961 | PackageEntry* pkg_entry, |
| 962 | Handle class_loader) { |
| 963 | assert(!ModuleEntryTable::javabase_moduleEntry()->is_patched(),do { if (!(!ModuleEntryTable::javabase_moduleEntry()->is_patched ())) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 964, "assert(" "!ModuleEntryTable::javabase_moduleEntry()->is_patched()" ") failed", "Cannot use sharing if java.base is patched"); :: breakpoint(); } } while (0) |
| 964 | "Cannot use sharing if java.base is patched")do { if (!(!ModuleEntryTable::javabase_moduleEntry()->is_patched ())) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 964, "assert(" "!ModuleEntryTable::javabase_moduleEntry()->is_patched()" ") failed", "Cannot use sharing if java.base is patched"); :: breakpoint(); } } while (0); |
| 965 | |
| 966 | // (1) Check if we are loading into the same loader as in dump time. |
| 967 | |
| 968 | if (ik->is_shared_boot_class()) { |
| 969 | if (class_loader() != NULL__null) { |
| 970 | return false; |
| 971 | } |
| 972 | } else if (ik->is_shared_platform_class()) { |
| 973 | if (class_loader() != java_platform_loader()) { |
| 974 | return false; |
| 975 | } |
| 976 | } else if (ik->is_shared_app_class()) { |
| 977 | if (class_loader() != java_system_loader()) { |
| 978 | return false; |
| 979 | } |
| 980 | } else { |
| 981 | // ik was loaded by a custom loader during dump time |
| 982 | if (class_loader_data(class_loader)->is_builtin_class_loader_data()) { |
| 983 | return false; |
| 984 | } else { |
| 985 | return true; |
| 986 | } |
| 987 | } |
| 988 | |
| 989 | // (2) Check if we are loading into the same module from the same location as in dump time. |
| 990 | |
| 991 | if (MetaspaceShared::use_optimized_module_handling()) { |
| 992 | // Class visibility has not changed between dump time and run time, so a class |
| 993 | // that was visible (and thus archived) during dump time is always visible during runtime. |
| 994 | assert(SystemDictionary::is_shared_class_visible_impl(class_name, ik, pkg_entry, class_loader),do { if (!(SystemDictionary::is_shared_class_visible_impl(class_name , ik, pkg_entry, class_loader))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 995, "assert(" "SystemDictionary::is_shared_class_visible_impl(class_name, ik, pkg_entry, class_loader)" ") failed", "visibility cannot change between dump time and runtime" ); ::breakpoint(); } } while (0) |
| 995 | "visibility cannot change between dump time and runtime")do { if (!(SystemDictionary::is_shared_class_visible_impl(class_name , ik, pkg_entry, class_loader))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 995, "assert(" "SystemDictionary::is_shared_class_visible_impl(class_name, ik, pkg_entry, class_loader)" ") failed", "visibility cannot change between dump time and runtime" ); ::breakpoint(); } } while (0); |
| 996 | return true; |
| 997 | } |
| 998 | return is_shared_class_visible_impl(class_name, ik, pkg_entry, class_loader); |
| 999 | } |
| 1000 | |
| 1001 | bool SystemDictionary::is_shared_class_visible_impl(Symbol* class_name, |
| 1002 | InstanceKlass* ik, |
| 1003 | PackageEntry* pkg_entry, |
| 1004 | Handle class_loader) { |
| 1005 | int scp_index = ik->shared_classpath_index(); |
| 1006 | assert(!ik->is_shared_unregistered_class(), "this function should be called for built-in classes only")do { if (!(!ik->is_shared_unregistered_class())) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1006, "assert(" "!ik->is_shared_unregistered_class()" ") failed" , "this function should be called for built-in classes only") ; ::breakpoint(); } } while (0); |
| 1007 | assert(scp_index >= 0, "must be")do { if (!(scp_index >= 0)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1007, "assert(" "scp_index >= 0" ") failed", "must be"); ::breakpoint(); } } while (0); |
| 1008 | SharedClassPathEntry* scp_entry = FileMapInfo::shared_path(scp_index); |
| 1009 | if (!Universe::is_module_initialized()) { |
| 1010 | assert(scp_entry != NULL && scp_entry->is_modules_image(),do { if (!(scp_entry != __null && scp_entry->is_modules_image ())) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1011, "assert(" "scp_entry != __null && scp_entry->is_modules_image()" ") failed", "Loading non-bootstrap classes before the module system is initialized" ); ::breakpoint(); } } while (0) |
| 1011 | "Loading non-bootstrap classes before the module system is initialized")do { if (!(scp_entry != __null && scp_entry->is_modules_image ())) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1011, "assert(" "scp_entry != __null && scp_entry->is_modules_image()" ") failed", "Loading non-bootstrap classes before the module system is initialized" ); ::breakpoint(); } } while (0); |
| 1012 | assert(class_loader.is_null(), "sanity")do { if (!(class_loader.is_null())) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1012, "assert(" "class_loader.is_null()" ") failed", "sanity" ); ::breakpoint(); } } while (0); |
| 1013 | return true; |
| 1014 | } |
| 1015 | |
| 1016 | ModuleEntry* mod_entry = (pkg_entry == NULL__null) ? NULL__null : pkg_entry->module(); |
| 1017 | bool should_be_in_named_module = (mod_entry != NULL__null && mod_entry->is_named()); |
| 1018 | bool was_archived_from_named_module = scp_entry->in_named_module(); |
| 1019 | bool visible; |
| 1020 | |
| 1021 | if (was_archived_from_named_module) { |
| 1022 | if (should_be_in_named_module) { |
| 1023 | // Is the module loaded from the same location as during dump time? |
| 1024 | visible = mod_entry->shared_path_index() == scp_index; |
| 1025 | if (visible) { |
| 1026 | assert(!mod_entry->is_patched(), "cannot load archived classes for patched module")do { if (!(!mod_entry->is_patched())) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1026, "assert(" "!mod_entry->is_patched()" ") failed", "cannot load archived classes for patched module" ); ::breakpoint(); } } while (0); |
| 1027 | } |
| 1028 | } else { |
| 1029 | // During dump time, this class was in a named module, but at run time, this class should be |
| 1030 | // in an unnamed module. |
| 1031 | visible = false; |
| 1032 | } |
| 1033 | } else { |
| 1034 | if (should_be_in_named_module) { |
| 1035 | // During dump time, this class was in an unnamed, but at run time, this class should be |
| 1036 | // in a named module. |
| 1037 | visible = false; |
| 1038 | } else { |
| 1039 | visible = true; |
| 1040 | } |
| 1041 | } |
| 1042 | |
| 1043 | return visible; |
| 1044 | } |
| 1045 | |
| 1046 | bool SystemDictionary::check_shared_class_super_type(InstanceKlass* klass, InstanceKlass* super_type, |
| 1047 | Handle class_loader, Handle protection_domain, |
| 1048 | bool is_superclass, TRAPSJavaThread* __the_thread__) { |
| 1049 | assert(super_type->is_shared(), "must be")do { if (!(super_type->is_shared())) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1049, "assert(" "super_type->is_shared()" ") failed", "must be" ); ::breakpoint(); } } while (0); |
| 1050 | |
| 1051 | // Quick check if the super type has been already loaded. |
| 1052 | // + Don't do it for unregistered classes -- they can be unloaded so |
| 1053 | // super_type->class_loader_data() could be stale. |
| 1054 | // + Don't check if loader data is NULL, ie. the super_type isn't fully loaded. |
| 1055 | if (!super_type->is_shared_unregistered_class() && super_type->class_loader_data() != NULL__null) { |
| 1056 | // Check if the superclass is loaded by the current class_loader |
| 1057 | Symbol* name = super_type->name(); |
| 1058 | InstanceKlass* check = find_instance_klass(name, class_loader, protection_domain); |
| 1059 | if (check == super_type) { |
| 1060 | return true; |
| 1061 | } |
| 1062 | } |
| 1063 | |
| 1064 | Klass *found = resolve_super_or_fail(klass->name(), super_type->name(), |
| 1065 | class_loader, protection_domain, is_superclass, CHECK_0__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return 0; (void)(0); |
| 1066 | if (found == super_type) { |
| 1067 | return true; |
| 1068 | } else { |
| 1069 | // The dynamically resolved super type is not the same as the one we used during dump time, |
| 1070 | // so we cannot use the class. |
| 1071 | return false; |
| 1072 | } |
| 1073 | } |
| 1074 | |
| 1075 | bool SystemDictionary::check_shared_class_super_types(InstanceKlass* ik, Handle class_loader, |
| 1076 | Handle protection_domain, TRAPSJavaThread* __the_thread__) { |
| 1077 | // Check the superclass and interfaces. They must be the same |
| 1078 | // as in dump time, because the layout of <ik> depends on |
| 1079 | // the specific layout of ik->super() and ik->local_interfaces(). |
| 1080 | // |
| 1081 | // If unexpected superclass or interfaces are found, we cannot |
| 1082 | // load <ik> from the shared archive. |
| 1083 | |
| 1084 | if (ik->super() != NULL__null && |
| 1085 | !check_shared_class_super_type(ik, InstanceKlass::cast(ik->super()), |
| 1086 | class_loader, protection_domain, true, THREAD__the_thread__)) { |
| 1087 | return false; |
| 1088 | } |
| 1089 | |
| 1090 | Array<InstanceKlass*>* interfaces = ik->local_interfaces(); |
| 1091 | int num_interfaces = interfaces->length(); |
| 1092 | for (int index = 0; index < num_interfaces; index++) { |
| 1093 | if (!check_shared_class_super_type(ik, interfaces->at(index), class_loader, protection_domain, false, THREAD__the_thread__)) { |
| 1094 | return false; |
| 1095 | } |
| 1096 | } |
| 1097 | |
| 1098 | return true; |
| 1099 | } |
| 1100 | |
| 1101 | InstanceKlass* SystemDictionary::load_shared_lambda_proxy_class(InstanceKlass* ik, |
| 1102 | Handle class_loader, |
| 1103 | Handle protection_domain, |
| 1104 | PackageEntry* pkg_entry, |
| 1105 | TRAPSJavaThread* __the_thread__) { |
| 1106 | InstanceKlass* shared_nest_host = SystemDictionaryShared::get_shared_nest_host(ik); |
| 1107 | assert(shared_nest_host->is_shared(), "nest host must be in CDS archive")do { if (!(shared_nest_host->is_shared())) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1107, "assert(" "shared_nest_host->is_shared()" ") failed" , "nest host must be in CDS archive"); ::breakpoint(); } } while (0); |
| 1108 | Symbol* cn = shared_nest_host->name(); |
| 1109 | Klass *s = resolve_or_fail(cn, class_loader, protection_domain, true, CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 1110 | if (s != shared_nest_host) { |
| 1111 | // The dynamically resolved nest_host is not the same as the one we used during dump time, |
| 1112 | // so we cannot use ik. |
| 1113 | return NULL__null; |
| 1114 | } else { |
| 1115 | assert(s->is_shared(), "must be")do { if (!(s->is_shared())) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1115, "assert(" "s->is_shared()" ") failed", "must be"); ::breakpoint(); } } while (0); |
| 1116 | } |
| 1117 | |
| 1118 | // The lambda proxy class and its nest host have the same class loader and class loader data, |
| 1119 | // as verified in SystemDictionaryShared::add_lambda_proxy_class() |
| 1120 | assert(shared_nest_host->class_loader() == class_loader(), "mismatched class loader")do { if (!(shared_nest_host->class_loader() == class_loader ())) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1120, "assert(" "shared_nest_host->class_loader() == class_loader()" ") failed", "mismatched class loader"); ::breakpoint(); } } while (0); |
| 1121 | assert(shared_nest_host->class_loader_data() == ClassLoaderData::class_loader_data(class_loader()), "mismatched class loader data")do { if (!(shared_nest_host->class_loader_data() == ClassLoaderData ::class_loader_data(class_loader()))) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1121, "assert(" "shared_nest_host->class_loader_data() == ClassLoaderData::class_loader_data(class_loader())" ") failed", "mismatched class loader data"); ::breakpoint(); } } while (0); |
| 1122 | ik->set_nest_host(shared_nest_host); |
| 1123 | |
| 1124 | InstanceKlass* loaded_ik = load_shared_class(ik, class_loader, protection_domain, NULL__null, pkg_entry, CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 1125 | |
| 1126 | if (loaded_ik != NULL__null) { |
| 1127 | assert(shared_nest_host->is_same_class_package(ik),do { if (!(shared_nest_host->is_same_class_package(ik))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1128, "assert(" "shared_nest_host->is_same_class_package(ik)" ") failed", "lambda proxy class and its nest host must be in the same package" ); ::breakpoint(); } } while (0) |
| 1128 | "lambda proxy class and its nest host must be in the same package")do { if (!(shared_nest_host->is_same_class_package(ik))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1128, "assert(" "shared_nest_host->is_same_class_package(ik)" ") failed", "lambda proxy class and its nest host must be in the same package" ); ::breakpoint(); } } while (0); |
| 1129 | } |
| 1130 | |
| 1131 | return loaded_ik; |
| 1132 | } |
| 1133 | |
| 1134 | InstanceKlass* SystemDictionary::load_shared_class(InstanceKlass* ik, |
| 1135 | Handle class_loader, |
| 1136 | Handle protection_domain, |
| 1137 | const ClassFileStream *cfs, |
| 1138 | PackageEntry* pkg_entry, |
| 1139 | TRAPSJavaThread* __the_thread__) { |
| 1140 | assert(ik != NULL, "sanity")do { if (!(ik != __null)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1140, "assert(" "ik != __null" ") failed", "sanity"); ::breakpoint (); } } while (0); |
| 1141 | assert(!ik->is_unshareable_info_restored(), "shared class can be loaded only once")do { if (!(!ik->is_unshareable_info_restored())) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1141, "assert(" "!ik->is_unshareable_info_restored()" ") failed" , "shared class can be loaded only once"); ::breakpoint(); } } while (0); |
| 1142 | Symbol* class_name = ik->name(); |
| 1143 | |
| 1144 | if (!is_shared_class_visible(class_name, ik, pkg_entry, class_loader)) { |
| 1145 | return NULL__null; |
| 1146 | } |
| 1147 | |
| 1148 | if (!check_shared_class_super_types(ik, class_loader, protection_domain, THREAD__the_thread__)) { |
| 1149 | return NULL__null; |
| 1150 | } |
| 1151 | |
| 1152 | InstanceKlass* new_ik = NULL__null; |
| 1153 | // CFLH check is skipped for VM hidden classes (see KlassFactory::create_from_stream). |
| 1154 | // It will be skipped for shared VM hidden lambda proxy classes. |
| 1155 | if (!SystemDictionaryShared::is_hidden_lambda_proxy(ik)) { |
| 1156 | new_ik = KlassFactory::check_shared_class_file_load_hook( |
| 1157 | ik, class_name, class_loader, protection_domain, cfs, CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 1158 | } |
| 1159 | if (new_ik != NULL__null) { |
| 1160 | // The class is changed by CFLH. Return the new class. The shared class is |
| 1161 | // not used. |
| 1162 | return new_ik; |
| 1163 | } |
| 1164 | |
| 1165 | // Adjust methods to recover missing data. They need addresses for |
| 1166 | // interpreter entry points and their default native method address |
| 1167 | // must be reset. |
| 1168 | |
| 1169 | // Shared classes are all currently loaded by either the bootstrap or |
| 1170 | // internal parallel class loaders, so this will never cause a deadlock |
| 1171 | // on a custom class loader lock. |
| 1172 | // Since this class is already locked with parallel capable class |
| 1173 | // loaders, including the bootstrap loader via the placeholder table, |
| 1174 | // this lock is currently a nop. |
| 1175 | |
| 1176 | ClassLoaderData* loader_data = ClassLoaderData::class_loader_data(class_loader()); |
| 1177 | { |
| 1178 | HandleMark hm(THREAD__the_thread__); |
| 1179 | Handle lockObject = get_loader_lock_or_null(class_loader); |
| 1180 | ObjectLocker ol(lockObject, THREAD__the_thread__); |
| 1181 | // prohibited package check assumes all classes loaded from archive call |
| 1182 | // restore_unshareable_info which calls ik->set_package() |
| 1183 | ik->restore_unshareable_info(loader_data, protection_domain, pkg_entry, CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 1184 | } |
| 1185 | |
| 1186 | load_shared_class_misc(ik, loader_data); |
| 1187 | return ik; |
| 1188 | } |
| 1189 | |
| 1190 | void SystemDictionary::load_shared_class_misc(InstanceKlass* ik, ClassLoaderData* loader_data) { |
| 1191 | ik->print_class_load_logging(loader_data, NULL__null, NULL__null); |
| 1192 | |
| 1193 | // For boot loader, ensure that GetSystemPackage knows that a class in this |
| 1194 | // package was loaded. |
| 1195 | if (loader_data->is_the_null_class_loader_data()) { |
| 1196 | int path_index = ik->shared_classpath_index(); |
| 1197 | ik->set_classpath_index(path_index); |
| 1198 | } |
| 1199 | |
| 1200 | // notify a class loaded from shared object |
| 1201 | ClassLoadingService::notify_class_loaded(ik, true /* shared class */); |
| 1202 | } |
| 1203 | |
| 1204 | #endif // INCLUDE_CDS |
| 1205 | |
| 1206 | InstanceKlass* SystemDictionary::load_instance_class_impl(Symbol* class_name, Handle class_loader, TRAPSJavaThread* __the_thread__) { |
| 1207 | |
| 1208 | if (class_loader.is_null()) { |
| 1209 | ResourceMark rm(THREAD__the_thread__); |
| 1210 | PackageEntry* pkg_entry = NULL__null; |
| 1211 | bool search_only_bootloader_append = false; |
| 1212 | ClassLoaderData *loader_data = class_loader_data(class_loader); |
| 1213 | |
| 1214 | // Find the package in the boot loader's package entry table. |
| 1215 | TempNewSymbol pkg_name = ClassLoader::package_from_class_name(class_name); |
| 1216 | if (pkg_name != NULL__null) { |
| 1217 | pkg_entry = loader_data->packages()->lookup_only(pkg_name); |
| 1218 | } |
| 1219 | |
| 1220 | // Prior to attempting to load the class, enforce the boot loader's |
| 1221 | // visibility boundaries. |
| 1222 | if (!Universe::is_module_initialized()) { |
| 1223 | // During bootstrapping, prior to module initialization, any |
| 1224 | // class attempting to be loaded must be checked against the |
| 1225 | // java.base packages in the boot loader's PackageEntryTable. |
| 1226 | // No class outside of java.base is allowed to be loaded during |
| 1227 | // this bootstrapping window. |
| 1228 | if (pkg_entry == NULL__null || pkg_entry->in_unnamed_module()) { |
| 1229 | // Class is either in the unnamed package or in |
| 1230 | // a named package within the unnamed module. Either |
| 1231 | // case is outside of java.base, do not attempt to |
| 1232 | // load the class post java.base definition. If |
| 1233 | // java.base has not been defined, let the class load |
| 1234 | // and its package will be checked later by |
| 1235 | // ModuleEntryTable::verify_javabase_packages. |
| 1236 | if (ModuleEntryTable::javabase_defined()) { |
| 1237 | return NULL__null; |
| 1238 | } |
| 1239 | } else { |
| 1240 | // Check that the class' package is defined within java.base. |
| 1241 | ModuleEntry* mod_entry = pkg_entry->module(); |
| 1242 | Symbol* mod_entry_name = mod_entry->name(); |
| 1243 | if (mod_entry_name->fast_compare(vmSymbols::java_base()) != 0) { |
| 1244 | return NULL__null; |
| 1245 | } |
| 1246 | } |
| 1247 | } else { |
| 1248 | // After the module system has been initialized, check if the class' |
| 1249 | // package is in a module defined to the boot loader. |
| 1250 | if (pkg_name == NULL__null || pkg_entry == NULL__null || pkg_entry->in_unnamed_module()) { |
| 1251 | // Class is either in the unnamed package, in a named package |
| 1252 | // within a module not defined to the boot loader or in a |
| 1253 | // a named package within the unnamed module. In all cases, |
| 1254 | // limit visibility to search for the class only in the boot |
| 1255 | // loader's append path. |
| 1256 | if (!ClassLoader::has_bootclasspath_append()) { |
| 1257 | // If there is no bootclasspath append entry, no need to continue |
| 1258 | // searching. |
| 1259 | return NULL__null; |
| 1260 | } |
| 1261 | search_only_bootloader_append = true; |
| 1262 | } |
| 1263 | } |
| 1264 | |
| 1265 | // Prior to bootstrapping's module initialization, never load a class outside |
| 1266 | // of the boot loader's module path |
| 1267 | assert(Universe::is_module_initialized() ||do { if (!(Universe::is_module_initialized() || !search_only_bootloader_append )) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1269, "assert(" "Universe::is_module_initialized() || !search_only_bootloader_append" ") failed", "Attempt to load a class outside of boot loader's module path" ); ::breakpoint(); } } while (0) |
| 1268 | !search_only_bootloader_append,do { if (!(Universe::is_module_initialized() || !search_only_bootloader_append )) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1269, "assert(" "Universe::is_module_initialized() || !search_only_bootloader_append" ") failed", "Attempt to load a class outside of boot loader's module path" ); ::breakpoint(); } } while (0) |
| 1269 | "Attempt to load a class outside of boot loader's module path")do { if (!(Universe::is_module_initialized() || !search_only_bootloader_append )) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1269, "assert(" "Universe::is_module_initialized() || !search_only_bootloader_append" ") failed", "Attempt to load a class outside of boot loader's module path" ); ::breakpoint(); } } while (0); |
| 1270 | |
| 1271 | // Search for classes in the CDS archive. |
| 1272 | InstanceKlass* k = NULL__null; |
| 1273 | |
| 1274 | #if INCLUDE_CDS1 |
| 1275 | if (UseSharedSpaces) |
| 1276 | { |
| 1277 | PerfTraceTime vmtimer(ClassLoader::perf_shared_classload_time()); |
| 1278 | InstanceKlass* ik = SystemDictionaryShared::find_builtin_class(class_name); |
| 1279 | if (ik != NULL__null && ik->is_shared_boot_class() && !ik->shared_loading_failed()) { |
| 1280 | SharedClassLoadingMark slm(THREAD__the_thread__, ik); |
| 1281 | k = load_shared_class(ik, class_loader, Handle(), NULL__null, pkg_entry, CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 1282 | } |
| 1283 | } |
| 1284 | #endif |
| 1285 | |
| 1286 | if (k == NULL__null) { |
| 1287 | // Use VM class loader |
| 1288 | PerfTraceTime vmtimer(ClassLoader::perf_sys_classload_time()); |
| 1289 | k = ClassLoader::load_class(class_name, search_only_bootloader_append, CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 1290 | } |
| 1291 | |
| 1292 | // find_or_define_instance_class may return a different InstanceKlass |
| 1293 | if (k != NULL__null) { |
| 1294 | CDS_ONLY(SharedClassLoadingMark slm(THREAD, k);)SharedClassLoadingMark slm(__the_thread__, k); |
| 1295 | k = find_or_define_instance_class(class_name, class_loader, k, CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 1296 | } |
| 1297 | return k; |
| 1298 | } else { |
| 1299 | // Use user specified class loader to load class. Call loadClass operation on class_loader. |
| 1300 | ResourceMark rm(THREAD__the_thread__); |
| 1301 | |
| 1302 | JavaThread* jt = THREAD__the_thread__; |
| 1303 | |
| 1304 | PerfClassTraceTime vmtimer(ClassLoader::perf_app_classload_time(), |
| 1305 | ClassLoader::perf_app_classload_selftime(), |
| 1306 | ClassLoader::perf_app_classload_count(), |
| 1307 | jt->get_thread_stat()->perf_recursion_counts_addr(), |
| 1308 | jt->get_thread_stat()->perf_timers_addr(), |
| 1309 | PerfClassTraceTime::CLASS_LOAD); |
| 1310 | |
| 1311 | // Translate to external class name format, i.e., convert '/' chars to '.' |
| 1312 | Handle string = java_lang_String::externalize_classname(class_name, CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 1313 | |
| 1314 | JavaValue result(T_OBJECT); |
| 1315 | |
| 1316 | InstanceKlass* spec_klass = vmClasses::ClassLoader_klass(); |
| 1317 | |
| 1318 | // Call public unsynchronized loadClass(String) directly for all class loaders. |
| 1319 | // For parallelCapable class loaders, JDK >=7, loadClass(String, boolean) will |
| 1320 | // acquire a class-name based lock rather than the class loader object lock. |
| 1321 | // JDK < 7 already acquire the class loader lock in loadClass(String, boolean). |
| 1322 | JavaCalls::call_virtual(&result, |
| 1323 | class_loader, |
| 1324 | spec_klass, |
| 1325 | vmSymbols::loadClass_name(), |
| 1326 | vmSymbols::string_class_signature(), |
| 1327 | string, |
| 1328 | CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 1329 | |
| 1330 | assert(result.get_type() == T_OBJECT, "just checking")do { if (!(result.get_type() == T_OBJECT)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1330, "assert(" "result.get_type() == T_OBJECT" ") failed", "just checking"); ::breakpoint(); } } while (0); |
| 1331 | oop obj = result.get_oop(); |
| 1332 | |
| 1333 | // Primitive classes return null since forName() can not be |
| 1334 | // used to obtain any of the Class objects representing primitives or void |
| 1335 | if ((obj != NULL__null) && !(java_lang_Class::is_primitive(obj))) { |
| 1336 | InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(obj)); |
| 1337 | // For user defined Java class loaders, check that the name returned is |
| 1338 | // the same as that requested. This check is done for the bootstrap |
| 1339 | // loader when parsing the class file. |
| 1340 | if (class_name == k->name()) { |
| 1341 | return k; |
| 1342 | } |
| 1343 | } |
| 1344 | // Class is not found or has the wrong name, return NULL |
| 1345 | return NULL__null; |
| 1346 | } |
| 1347 | } |
| 1348 | |
| 1349 | InstanceKlass* SystemDictionary::load_instance_class(unsigned int name_hash, |
| 1350 | Symbol* name, |
| 1351 | Handle class_loader, |
| 1352 | TRAPSJavaThread* __the_thread__) { |
| 1353 | |
| 1354 | InstanceKlass* loaded_class = load_instance_class_impl(name, class_loader, CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 1355 | |
| 1356 | // If everything was OK (no exceptions, no null return value), and |
| 1357 | // class_loader is NOT the defining loader, do a little more bookkeeping. |
| 1358 | if (loaded_class != NULL__null && |
| 1359 | loaded_class->class_loader() != class_loader()) { |
| 1360 | |
| 1361 | check_constraints(name_hash, loaded_class, class_loader, false, CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 1362 | |
| 1363 | // Record dependency for non-parent delegation. |
| 1364 | // This recording keeps the defining class loader of the klass (loaded_class) found |
| 1365 | // from being unloaded while the initiating class loader is loaded |
| 1366 | // even if the reference to the defining class loader is dropped |
| 1367 | // before references to the initiating class loader. |
| 1368 | ClassLoaderData* loader_data = class_loader_data(class_loader); |
| 1369 | loader_data->record_dependency(loaded_class); |
| 1370 | |
| 1371 | { // Grabbing the Compile_lock prevents systemDictionary updates |
| 1372 | // during compilations. |
| 1373 | MutexLocker mu(THREAD__the_thread__, Compile_lock); |
| 1374 | update_dictionary(name_hash, loaded_class, class_loader); |
| 1375 | } |
| 1376 | |
| 1377 | if (JvmtiExport::should_post_class_load()) { |
| 1378 | JvmtiExport::post_class_load(THREAD__the_thread__, loaded_class); |
| 1379 | } |
| 1380 | } |
| 1381 | return loaded_class; |
| 1382 | } |
| 1383 | |
| 1384 | static void post_class_define_event(InstanceKlass* k, const ClassLoaderData* def_cld) { |
| 1385 | EventClassDefine event; |
| 1386 | if (event.should_commit()) { |
| 1387 | event.set_definedClass(k); |
| 1388 | event.set_definingClassLoader(def_cld); |
| 1389 | event.commit(); |
| 1390 | } |
| 1391 | } |
| 1392 | |
| 1393 | void SystemDictionary::define_instance_class(InstanceKlass* k, Handle class_loader, TRAPSJavaThread* __the_thread__) { |
| 1394 | |
| 1395 | ClassLoaderData* loader_data = k->class_loader_data(); |
| 1396 | assert(loader_data->class_loader() == class_loader(), "they must be the same")do { if (!(loader_data->class_loader() == class_loader())) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1396, "assert(" "loader_data->class_loader() == class_loader()" ") failed", "they must be the same"); ::breakpoint(); } } while (0); |
| 1397 | |
| 1398 | // Bootstrap and other parallel classloaders don't acquire a lock, |
| 1399 | // they use placeholder token. |
| 1400 | // If a parallelCapable class loader calls define_instance_class instead of |
| 1401 | // find_or_define_instance_class to get here, we have a timing |
| 1402 | // hole with systemDictionary updates and check_constraints |
| 1403 | if (!is_parallelCapable(class_loader)) { |
| 1404 | assert(ObjectSynchronizer::current_thread_holds_lock(THREAD,do { if (!(ObjectSynchronizer::current_thread_holds_lock(__the_thread__ , get_loader_lock_or_null(class_loader)))) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1406, "assert(" "ObjectSynchronizer::current_thread_holds_lock(__the_thread__, get_loader_lock_or_null(class_loader))" ") failed", "define called without lock"); ::breakpoint(); } } while (0) |
| 1405 | get_loader_lock_or_null(class_loader)),do { if (!(ObjectSynchronizer::current_thread_holds_lock(__the_thread__ , get_loader_lock_or_null(class_loader)))) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1406, "assert(" "ObjectSynchronizer::current_thread_holds_lock(__the_thread__, get_loader_lock_or_null(class_loader))" ") failed", "define called without lock"); ::breakpoint(); } } while (0) |
| 1406 | "define called without lock")do { if (!(ObjectSynchronizer::current_thread_holds_lock(__the_thread__ , get_loader_lock_or_null(class_loader)))) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1406, "assert(" "ObjectSynchronizer::current_thread_holds_lock(__the_thread__, get_loader_lock_or_null(class_loader))" ") failed", "define called without lock"); ::breakpoint(); } } while (0); |
| 1407 | } |
| 1408 | |
| 1409 | // Check class-loading constraints. Throw exception if violation is detected. |
| 1410 | // Grabs and releases SystemDictionary_lock |
| 1411 | // The check_constraints/find_class call and update_dictionary sequence |
| 1412 | // must be "atomic" for a specific class/classloader pair so we never |
| 1413 | // define two different instanceKlasses for that class/classloader pair. |
| 1414 | // Existing classloaders will call define_instance_class with the |
| 1415 | // classloader lock held |
| 1416 | // Parallel classloaders will call find_or_define_instance_class |
| 1417 | // which will require a token to perform the define class |
| 1418 | Symbol* name_h = k->name(); |
| 1419 | Dictionary* dictionary = loader_data->dictionary(); |
| 1420 | unsigned int name_hash = dictionary->compute_hash(name_h); |
| 1421 | check_constraints(name_hash, k, class_loader, true, CHECK__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return ; (void)(0); |
| 1422 | |
| 1423 | // Register class just loaded with class loader (placed in ArrayList) |
| 1424 | // Note we do this before updating the dictionary, as this can |
| 1425 | // fail with an OutOfMemoryError (if it does, we will *not* put this |
| 1426 | // class in the dictionary and will not update the class hierarchy). |
| 1427 | // JVMTI FollowReferences needs to find the classes this way. |
| 1428 | if (k->class_loader() != NULL__null) { |
| 1429 | methodHandle m(THREAD__the_thread__, Universe::loader_addClass_method()); |
| 1430 | JavaValue result(T_VOID); |
| 1431 | JavaCallArguments args(class_loader); |
| 1432 | args.push_oop(Handle(THREAD__the_thread__, k->java_mirror())); |
| 1433 | JavaCalls::call(&result, m, &args, CHECK__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return ; (void)(0); |
| 1434 | } |
| 1435 | |
| 1436 | // Add the new class. We need recompile lock during update of CHA. |
| 1437 | { |
| 1438 | MutexLocker mu_r(THREAD__the_thread__, Compile_lock); |
| 1439 | |
| 1440 | // Add to class hierarchy, and do possible deoptimizations. |
| 1441 | add_to_hierarchy(k); |
| 1442 | |
| 1443 | // Add to systemDictionary - so other classes can see it. |
| 1444 | // Grabs and releases SystemDictionary_lock |
| 1445 | update_dictionary(name_hash, k, class_loader); |
| 1446 | } |
| 1447 | k->eager_initialize(THREAD__the_thread__); |
| 1448 | |
| 1449 | // notify jvmti |
| 1450 | if (JvmtiExport::should_post_class_load()) { |
| 1451 | JvmtiExport::post_class_load(THREAD__the_thread__, k); |
| 1452 | } |
| 1453 | post_class_define_event(k, loader_data); |
| 1454 | } |
| 1455 | |
| 1456 | // Support parallel classloading |
| 1457 | // All parallel class loaders, including bootstrap classloader |
| 1458 | // lock a placeholder entry for this class/class_loader pair |
| 1459 | // to allow parallel defines of different classes for this class loader |
| 1460 | // With AllowParallelDefine flag==true, in case they do not synchronize around |
| 1461 | // FindLoadedClass/DefineClass, calls, we check for parallel |
| 1462 | // loading for them, wait if a defineClass is in progress |
| 1463 | // and return the initial requestor's results |
| 1464 | // This flag does not apply to the bootstrap classloader. |
| 1465 | // With AllowParallelDefine flag==false, call through to define_instance_class |
| 1466 | // which will throw LinkageError: duplicate class definition. |
| 1467 | // False is the requested default. |
| 1468 | // For better performance, the class loaders should synchronize |
| 1469 | // findClass(), i.e. FindLoadedClass/DefineClassIfAbsent or they |
| 1470 | // potentially waste time reading and parsing the bytestream. |
| 1471 | // Note: VM callers should ensure consistency of k/class_name,class_loader |
| 1472 | // Be careful when modifying this code: once you have run |
| 1473 | // placeholders()->find_and_add(PlaceholderTable::DEFINE_CLASS), |
| 1474 | // you need to find_and_remove it before returning. |
| 1475 | // So be careful to not exit with a CHECK_ macro between these calls. |
| 1476 | InstanceKlass* SystemDictionary::find_or_define_helper(Symbol* class_name, Handle class_loader, |
| 1477 | InstanceKlass* k, TRAPSJavaThread* __the_thread__) { |
| 1478 | |
| 1479 | Symbol* name_h = k->name(); // passed in class_name may be null |
| 1480 | ClassLoaderData* loader_data = class_loader_data(class_loader); |
| 1481 | Dictionary* dictionary = loader_data->dictionary(); |
| 1482 | |
| 1483 | unsigned int name_hash = dictionary->compute_hash(name_h); |
| 1484 | |
| 1485 | // Hold SD lock around find_class and placeholder creation for DEFINE_CLASS |
| 1486 | { |
| 1487 | MutexLocker mu(THREAD__the_thread__, SystemDictionary_lock); |
| 1488 | // First check if class already defined |
| 1489 | if (is_parallelDefine(class_loader)) { |
| 1490 | InstanceKlass* check = dictionary->find_class(name_hash, name_h); |
| 1491 | if (check != NULL__null) { |
| 1492 | return check; |
| 1493 | } |
| 1494 | } |
| 1495 | |
| 1496 | // Acquire define token for this class/classloader |
| 1497 | assert(placeholders()->compute_hash(name_h) == name_hash, "they're the same hashcode")do { if (!(placeholders()->compute_hash(name_h) == name_hash )) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1497, "assert(" "placeholders()->compute_hash(name_h) == name_hash" ") failed", "they're the same hashcode"); ::breakpoint(); } } while (0); |
| 1498 | PlaceholderEntry* probe = placeholders()->find_and_add(name_hash, name_h, loader_data, |
| 1499 | PlaceholderTable::DEFINE_CLASS, NULL__null, THREAD__the_thread__); |
| 1500 | // Wait if another thread defining in parallel |
| 1501 | // All threads wait - even those that will throw duplicate class: otherwise |
| 1502 | // caller is surprised by LinkageError: duplicate, but findLoadedClass fails |
| 1503 | // if other thread has not finished updating dictionary |
| 1504 | while (probe->definer() != NULL__null) { |
| 1505 | SystemDictionary_lock->wait(); |
| 1506 | } |
| 1507 | // Only special cases allow parallel defines and can use other thread's results |
| 1508 | // Other cases fall through, and may run into duplicate defines |
| 1509 | // caught by finding an entry in the SystemDictionary |
| 1510 | if (is_parallelDefine(class_loader) && (probe->instance_klass() != NULL__null)) { |
| 1511 | InstanceKlass* ik = probe->instance_klass(); |
| 1512 | placeholders()->find_and_remove(name_hash, name_h, loader_data, PlaceholderTable::DEFINE_CLASS, THREAD__the_thread__); |
| 1513 | SystemDictionary_lock->notify_all(); |
| 1514 | #ifdef ASSERT1 |
| 1515 | InstanceKlass* check = dictionary->find_class(name_hash, name_h); |
| 1516 | assert(check != NULL, "definer missed recording success")do { if (!(check != __null)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1516, "assert(" "check != __null" ") failed", "definer missed recording success" ); ::breakpoint(); } } while (0); |
| 1517 | #endif |
| 1518 | return ik; |
| 1519 | } else { |
| 1520 | // This thread will define the class (even if earlier thread tried and had an error) |
| 1521 | probe->set_definer(THREAD__the_thread__); |
| 1522 | } |
| 1523 | } |
| 1524 | |
| 1525 | define_instance_class(k, class_loader, THREAD__the_thread__); |
| 1526 | |
| 1527 | // definer must notify any waiting threads |
| 1528 | { |
| 1529 | MutexLocker mu(THREAD__the_thread__, SystemDictionary_lock); |
| 1530 | PlaceholderEntry* probe = placeholders()->get_entry(name_hash, name_h, loader_data); |
| 1531 | assert(probe != NULL, "DEFINE_CLASS placeholder lost?")do { if (!(probe != __null)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1531, "assert(" "probe != __null" ") failed", "DEFINE_CLASS placeholder lost?" ); ::breakpoint(); } } while (0); |
| 1532 | if (!HAS_PENDING_EXCEPTION(((ThreadShadow*)__the_thread__)->has_pending_exception())) { |
| 1533 | probe->set_instance_klass(k); |
| 1534 | } |
| 1535 | probe->set_definer(NULL__null); |
| 1536 | placeholders()->find_and_remove(name_hash, name_h, loader_data, PlaceholderTable::DEFINE_CLASS, THREAD__the_thread__); |
| 1537 | SystemDictionary_lock->notify_all(); |
| 1538 | } |
| 1539 | |
| 1540 | return HAS_PENDING_EXCEPTION(((ThreadShadow*)__the_thread__)->has_pending_exception()) ? NULL__null : k; |
| 1541 | } |
| 1542 | |
| 1543 | // If a class loader supports parallel classloading handle parallel define requests. |
| 1544 | // find_or_define_instance_class may return a different InstanceKlass |
| 1545 | InstanceKlass* SystemDictionary::find_or_define_instance_class(Symbol* class_name, Handle class_loader, |
| 1546 | InstanceKlass* k, TRAPSJavaThread* __the_thread__) { |
| 1547 | InstanceKlass* defined_k = find_or_define_helper(class_name, class_loader, k, THREAD__the_thread__); |
| 1548 | // Clean up original InstanceKlass if duplicate or error |
| 1549 | if (!HAS_PENDING_EXCEPTION(((ThreadShadow*)__the_thread__)->has_pending_exception()) && defined_k != k) { |
| 1550 | // If a parallel capable class loader already defined this class, register 'k' for cleanup. |
| 1551 | assert(defined_k != NULL, "Should have a klass if there's no exception")do { if (!(defined_k != __null)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1551, "assert(" "defined_k != __null" ") failed", "Should have a klass if there's no exception" ); ::breakpoint(); } } while (0); |
| 1552 | k->class_loader_data()->add_to_deallocate_list(k); |
| 1553 | } else if (HAS_PENDING_EXCEPTION(((ThreadShadow*)__the_thread__)->has_pending_exception())) { |
| 1554 | assert(defined_k == NULL, "Should not have a klass if there's an exception")do { if (!(defined_k == __null)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1554, "assert(" "defined_k == __null" ") failed", "Should not have a klass if there's an exception" ); ::breakpoint(); } } while (0); |
| 1555 | k->class_loader_data()->add_to_deallocate_list(k); |
| 1556 | } |
| 1557 | return defined_k; |
| 1558 | } |
| 1559 | |
| 1560 | |
| 1561 | // ---------------------------------------------------------------------------- |
| 1562 | // Update hierachy. This is done before the new klass has been added to the SystemDictionary. The Compile_lock |
| 1563 | // is held, to ensure that the compiler is not using the class hierachy, and that deoptimization will kick in |
| 1564 | // before a new class is used. |
| 1565 | |
| 1566 | void SystemDictionary::add_to_hierarchy(InstanceKlass* k) { |
| 1567 | assert(k != NULL, "just checking")do { if (!(k != __null)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1567, "assert(" "k != __null" ") failed", "just checking"); ::breakpoint(); } } while (0); |
| 1568 | if (Universe::is_fully_initialized()) { |
| 1569 | assert_locked_or_safepoint(Compile_lock); |
| 1570 | } |
| 1571 | |
| 1572 | k->set_init_state(InstanceKlass::loaded); |
| 1573 | // make sure init_state store is already done. |
| 1574 | // The compiler reads the hierarchy outside of the Compile_lock. |
| 1575 | // Access ordering is used to add to hierarchy. |
| 1576 | |
| 1577 | // Link into hierachy. |
| 1578 | k->append_to_sibling_list(); // add to superklass/sibling list |
| 1579 | k->process_interfaces(); // handle all "implements" declarations |
| 1580 | |
| 1581 | // Now flush all code that depended on old class hierarchy. |
| 1582 | // Note: must be done *after* linking k into the hierarchy (was bug 12/9/97) |
| 1583 | if (Universe::is_fully_initialized()) { |
| 1584 | CodeCache::flush_dependents_on(k); |
| 1585 | } |
| 1586 | } |
| 1587 | |
| 1588 | // ---------------------------------------------------------------------------- |
| 1589 | // GC support |
| 1590 | |
| 1591 | // Assumes classes in the SystemDictionary are only unloaded at a safepoint |
| 1592 | bool SystemDictionary::do_unloading(GCTimer* gc_timer) { |
| 1593 | |
| 1594 | bool unloading_occurred; |
| 1595 | bool is_concurrent = !SafepointSynchronize::is_at_safepoint(); |
| 1596 | { |
| 1597 | GCTraceTime(Debug, gc, phases)GCTraceTimeWrapper<LogLevel::Debug, (LogTag::_gc), (LogTag ::_phases), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag:: __NO_TAG), (LogTag::__NO_TAG)> t("ClassLoaderData", gc_timer); |
| 1598 | assert_locked_or_safepoint(ClassLoaderDataGraph_lock); // caller locks. |
| 1599 | // First, mark for unload all ClassLoaderData referencing a dead class loader. |
| 1600 | unloading_occurred = ClassLoaderDataGraph::do_unloading(); |
| 1601 | if (unloading_occurred) { |
| 1602 | MutexLocker ml2(is_concurrent ? Module_lock : NULL__null); |
| 1603 | JFR_ONLY(Jfr::on_unloading_classes();)Jfr::on_unloading_classes(); |
| 1604 | MANAGEMENT_ONLY(FinalizerService::purge_unloaded();)FinalizerService::purge_unloaded(); |
| 1605 | MutexLocker ml1(is_concurrent ? SystemDictionary_lock : NULL__null); |
| 1606 | ClassLoaderDataGraph::clean_module_and_package_info(); |
| 1607 | constraints()->purge_loader_constraints(); |
| 1608 | resolution_errors()->purge_resolution_errors(); |
| 1609 | } |
| 1610 | } |
| 1611 | |
| 1612 | GCTraceTime(Debug, gc, phases)GCTraceTimeWrapper<LogLevel::Debug, (LogTag::_gc), (LogTag ::_phases), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag:: __NO_TAG), (LogTag::__NO_TAG)> t("Trigger cleanups", gc_timer); |
| 1613 | |
| 1614 | if (unloading_occurred) { |
| 1615 | SymbolTable::trigger_cleanup(); |
| 1616 | |
| 1617 | if (java_lang_System::allow_security_manager()) { |
| 1618 | // Oops referenced by the protection domain cache table may get unreachable independently |
| 1619 | // of the class loader (eg. cached protection domain oops). So we need to |
| 1620 | // explicitly unlink them here. |
| 1621 | // All protection domain oops are linked to the caller class, so if nothing |
| 1622 | // unloads, this is not needed. |
| 1623 | _pd_cache_table->trigger_cleanup(); |
| 1624 | } else { |
| 1625 | assert(_pd_cache_table->number_of_entries() == 0, "should be empty")do { if (!(_pd_cache_table->number_of_entries() == 0)) { ( *g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1625, "assert(" "_pd_cache_table->number_of_entries() == 0" ") failed", "should be empty"); ::breakpoint(); } } while (0 ); |
| 1626 | } |
| 1627 | |
| 1628 | MutexLocker ml(is_concurrent ? ClassInitError_lock : NULL__null); |
| 1629 | InstanceKlass::clean_initialization_error_table(); |
| 1630 | } |
| 1631 | |
| 1632 | return unloading_occurred; |
| 1633 | } |
| 1634 | |
| 1635 | void SystemDictionary::methods_do(void f(Method*)) { |
| 1636 | // Walk methods in loaded classes |
| 1637 | MutexLocker ml(ClassLoaderDataGraph_lock); |
| 1638 | ClassLoaderDataGraph::methods_do(f); |
| 1639 | // Walk method handle intrinsics |
| 1640 | invoke_method_table()->methods_do(f); |
| 1641 | } |
| 1642 | |
| 1643 | // ---------------------------------------------------------------------------- |
| 1644 | // Initialization |
| 1645 | |
| 1646 | void SystemDictionary::initialize(TRAPSJavaThread* __the_thread__) { |
| 1647 | // Allocate arrays |
| 1648 | _placeholders = new PlaceholderTable(_placeholder_table_size); |
| 1649 | _loader_constraints = new LoaderConstraintTable(_loader_constraint_size); |
| 1650 | _resolution_errors = new ResolutionErrorTable(_resolution_error_size); |
| 1651 | _invoke_method_table = new SymbolPropertyTable(_invoke_method_size); |
| 1652 | _pd_cache_table = new ProtectionDomainCacheTable(defaultProtectionDomainCacheSize); |
| 1653 | |
| 1654 | // Resolve basic classes |
| 1655 | vmClasses::resolve_all(CHECK__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return ; (void)(0); |
| 1656 | // Resolve classes used by archived heap objects |
| 1657 | if (UseSharedSpaces) { |
| 1658 | HeapShared::resolve_classes(THREAD__the_thread__); |
| 1659 | } |
| 1660 | } |
| 1661 | |
| 1662 | // Constraints on class loaders. The details of the algorithm can be |
| 1663 | // found in the OOPSLA'98 paper "Dynamic Class Loading in the Java |
| 1664 | // Virtual Machine" by Sheng Liang and Gilad Bracha. The basic idea is |
| 1665 | // that the dictionary needs to maintain a set of contraints that |
| 1666 | // must be satisfied by all classes in the dictionary. |
| 1667 | // if defining is true, then LinkageError if already in dictionary |
| 1668 | // if initiating loader, then ok if InstanceKlass matches existing entry |
| 1669 | |
| 1670 | void SystemDictionary::check_constraints(unsigned int name_hash, |
| 1671 | InstanceKlass* k, |
| 1672 | Handle class_loader, |
| 1673 | bool defining, |
| 1674 | TRAPSJavaThread* __the_thread__) { |
| 1675 | ResourceMark rm(THREAD__the_thread__); |
| 1676 | stringStream ss; |
| 1677 | bool throwException = false; |
| 1678 | |
| 1679 | { |
| 1680 | Symbol *name = k->name(); |
| 1681 | ClassLoaderData *loader_data = class_loader_data(class_loader); |
| 1682 | |
| 1683 | MutexLocker mu(THREAD__the_thread__, SystemDictionary_lock); |
| 1684 | |
| 1685 | InstanceKlass* check = loader_data->dictionary()->find_class(name_hash, name); |
| 1686 | if (check != NULL__null) { |
| 1687 | // If different InstanceKlass - duplicate class definition, |
| 1688 | // else - ok, class loaded by a different thread in parallel. |
| 1689 | // We should only have found it if it was done loading and ok to use. |
| 1690 | |
| 1691 | if ((defining == true) || (k != check)) { |
| 1692 | throwException = true; |
| 1693 | ss.print("loader %s", loader_data->loader_name_and_id()); |
| 1694 | ss.print(" attempted duplicate %s definition for %s. (%s)", |
| 1695 | k->external_kind(), k->external_name(), k->class_in_module_of_loader(false, true)); |
| 1696 | } else { |
| 1697 | return; |
| 1698 | } |
| 1699 | } |
| 1700 | |
| 1701 | if (throwException == false) { |
| 1702 | if (constraints()->check_or_update(k, class_loader, name) == false) { |
| 1703 | throwException = true; |
| 1704 | ss.print("loader constraint violation: loader %s", loader_data->loader_name_and_id()); |
| 1705 | ss.print(" wants to load %s %s.", |
| 1706 | k->external_kind(), k->external_name()); |
| 1707 | Klass *existing_klass = constraints()->find_constrained_klass(name, class_loader); |
| 1708 | if (existing_klass != NULL__null && existing_klass->class_loader() != class_loader()) { |
| 1709 | ss.print(" A different %s with the same name was previously loaded by %s. (%s)", |
| 1710 | existing_klass->external_kind(), |
| 1711 | existing_klass->class_loader_data()->loader_name_and_id(), |
| 1712 | existing_klass->class_in_module_of_loader(false, true)); |
| 1713 | } else { |
| 1714 | ss.print(" (%s)", k->class_in_module_of_loader(false, true)); |
| 1715 | } |
| 1716 | } |
| 1717 | } |
| 1718 | } |
| 1719 | |
| 1720 | // Throw error now if needed (cannot throw while holding |
| 1721 | // SystemDictionary_lock because of rank ordering) |
| 1722 | if (throwException == true) { |
| 1723 | THROW_MSG(vmSymbols::java_lang_LinkageError(), ss.as_string()){ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 1723, vmSymbols::java_lang_LinkageError(), ss.as_string()); return; }; |
| 1724 | } |
| 1725 | } |
| 1726 | |
| 1727 | // Update class loader data dictionary - done after check_constraint and add_to_hierachy |
| 1728 | // have been called. |
| 1729 | void SystemDictionary::update_dictionary(unsigned int hash, |
| 1730 | InstanceKlass* k, |
| 1731 | Handle class_loader) { |
| 1732 | // Compile_lock prevents systemDictionary updates during compilations |
| 1733 | assert_locked_or_safepoint(Compile_lock); |
| 1734 | Symbol* name = k->name(); |
| 1735 | ClassLoaderData *loader_data = class_loader_data(class_loader); |
| 1736 | |
| 1737 | { |
| 1738 | MutexLocker mu1(SystemDictionary_lock); |
| 1739 | |
| 1740 | // Make a new dictionary entry. |
| 1741 | Dictionary* dictionary = loader_data->dictionary(); |
| 1742 | InstanceKlass* sd_check = dictionary->find_class(hash, name); |
| 1743 | if (sd_check == NULL__null) { |
| 1744 | dictionary->add_klass(hash, name, k); |
| 1745 | } |
| 1746 | SystemDictionary_lock->notify_all(); |
| 1747 | } |
| 1748 | } |
| 1749 | |
| 1750 | |
| 1751 | // Try to find a class name using the loader constraints. The |
| 1752 | // loader constraints might know about a class that isn't fully loaded |
| 1753 | // yet and these will be ignored. |
| 1754 | Klass* SystemDictionary::find_constrained_instance_or_array_klass( |
| 1755 | Thread* current, Symbol* class_name, Handle class_loader) { |
| 1756 | |
| 1757 | // First see if it has been loaded directly. |
| 1758 | // Force the protection domain to be null. (This removes protection checks.) |
| 1759 | Handle no_protection_domain; |
| 1760 | Klass* klass = find_instance_or_array_klass(class_name, class_loader, |
| 1761 | no_protection_domain); |
| 1762 | if (klass != NULL__null) |
| 1763 | return klass; |
| 1764 | |
| 1765 | // Now look to see if it has been loaded elsewhere, and is subject to |
| 1766 | // a loader constraint that would require this loader to return the |
| 1767 | // klass that is already loaded. |
| 1768 | if (Signature::is_array(class_name)) { |
| 1769 | // For array classes, their Klass*s are not kept in the |
| 1770 | // constraint table. The element Klass*s are. |
| 1771 | SignatureStream ss(class_name, false); |
| 1772 | int ndims = ss.skip_array_prefix(); // skip all '['s |
| 1773 | BasicType t = ss.type(); |
| 1774 | if (t != T_OBJECT) { |
| 1775 | klass = Universe::typeArrayKlassObj(t); |
| 1776 | } else { |
| 1777 | MutexLocker mu(current, SystemDictionary_lock); |
| 1778 | klass = constraints()->find_constrained_klass(ss.as_symbol(), class_loader); |
| 1779 | } |
| 1780 | // If element class already loaded, allocate array klass |
| 1781 | if (klass != NULL__null) { |
| 1782 | klass = klass->array_klass_or_null(ndims); |
| 1783 | } |
| 1784 | } else { |
| 1785 | MutexLocker mu(current, SystemDictionary_lock); |
| 1786 | // Non-array classes are easy: simply check the constraint table. |
| 1787 | klass = constraints()->find_constrained_klass(class_name, class_loader); |
| 1788 | } |
| 1789 | |
| 1790 | return klass; |
| 1791 | } |
| 1792 | |
| 1793 | bool SystemDictionary::add_loader_constraint(Symbol* class_name, |
| 1794 | Klass* klass_being_linked, |
| 1795 | Handle class_loader1, |
| 1796 | Handle class_loader2) { |
| 1797 | ClassLoaderData* loader_data1 = class_loader_data(class_loader1); |
| 1798 | ClassLoaderData* loader_data2 = class_loader_data(class_loader2); |
| 1799 | |
| 1800 | Symbol* constraint_name = NULL__null; |
| 1801 | |
| 1802 | if (!Signature::is_array(class_name)) { |
| 1803 | constraint_name = class_name; |
| 1804 | } else { |
| 1805 | // For array classes, their Klass*s are not kept in the |
| 1806 | // constraint table. The element classes are. |
| 1807 | SignatureStream ss(class_name, false); |
| 1808 | ss.skip_array_prefix(); // skip all '['s |
| 1809 | if (!ss.has_envelope()) { |
| 1810 | return true; // primitive types always pass |
| 1811 | } |
| 1812 | constraint_name = ss.as_symbol(); |
| 1813 | // Increment refcount to keep constraint_name alive after |
| 1814 | // SignatureStream is destructed. It will be decremented below |
| 1815 | // before returning. |
| 1816 | constraint_name->increment_refcount(); |
| 1817 | } |
| 1818 | |
| 1819 | Dictionary* dictionary1 = loader_data1->dictionary(); |
| 1820 | unsigned int name_hash1 = dictionary1->compute_hash(constraint_name); |
| 1821 | |
| 1822 | Dictionary* dictionary2 = loader_data2->dictionary(); |
| 1823 | unsigned int name_hash2 = dictionary2->compute_hash(constraint_name); |
| 1824 | |
| 1825 | { |
| 1826 | MutexLocker mu_s(SystemDictionary_lock); |
| 1827 | InstanceKlass* klass1 = dictionary1->find_class(name_hash1, constraint_name); |
| 1828 | InstanceKlass* klass2 = dictionary2->find_class(name_hash2, constraint_name); |
| 1829 | bool result = constraints()->add_entry(constraint_name, klass1, class_loader1, |
| 1830 | klass2, class_loader2); |
| 1831 | #if INCLUDE_CDS1 |
| 1832 | if (Arguments::is_dumping_archive() && klass_being_linked != NULL__null && |
| 1833 | !klass_being_linked->is_shared()) { |
| 1834 | SystemDictionaryShared::record_linking_constraint(constraint_name, |
| 1835 | InstanceKlass::cast(klass_being_linked), |
| 1836 | class_loader1, class_loader2); |
| 1837 | } |
| 1838 | #endif // INCLUDE_CDS |
| 1839 | if (Signature::is_array(class_name)) { |
| 1840 | constraint_name->decrement_refcount(); |
| 1841 | } |
| 1842 | return result; |
| 1843 | } |
| 1844 | } |
| 1845 | |
| 1846 | // Add entry to resolution error table to record the error when the first |
| 1847 | // attempt to resolve a reference to a class has failed. |
| 1848 | void SystemDictionary::add_resolution_error(const constantPoolHandle& pool, int which, |
| 1849 | Symbol* error, Symbol* message, |
| 1850 | Symbol* cause, Symbol* cause_msg) { |
| 1851 | unsigned int hash = resolution_errors()->compute_hash(pool, which); |
| 1852 | int index = resolution_errors()->hash_to_index(hash); |
| 1853 | { |
| 1854 | MutexLocker ml(Thread::current(), SystemDictionary_lock); |
| 1855 | ResolutionErrorEntry* entry = resolution_errors()->find_entry(index, hash, pool, which); |
| 1856 | if (entry == NULL__null) { |
| 1857 | resolution_errors()->add_entry(index, hash, pool, which, error, message, cause, cause_msg); |
| 1858 | } |
| 1859 | } |
| 1860 | } |
| 1861 | |
| 1862 | // Delete a resolution error for RedefineClasses for a constant pool is going away |
| 1863 | void SystemDictionary::delete_resolution_error(ConstantPool* pool) { |
| 1864 | resolution_errors()->delete_entry(pool); |
| 1865 | } |
| 1866 | |
| 1867 | // Lookup resolution error table. Returns error if found, otherwise NULL. |
| 1868 | Symbol* SystemDictionary::find_resolution_error(const constantPoolHandle& pool, int which, |
| 1869 | Symbol** message, Symbol** cause, Symbol** cause_msg) { |
| 1870 | unsigned int hash = resolution_errors()->compute_hash(pool, which); |
| 1871 | int index = resolution_errors()->hash_to_index(hash); |
| 1872 | { |
| 1873 | MutexLocker ml(Thread::current(), SystemDictionary_lock); |
| 1874 | ResolutionErrorEntry* entry = resolution_errors()->find_entry(index, hash, pool, which); |
| 1875 | if (entry != NULL__null) { |
| 1876 | *message = entry->message(); |
| 1877 | *cause = entry->cause(); |
| 1878 | *cause_msg = entry->cause_msg(); |
| 1879 | return entry->error(); |
| 1880 | } else { |
| 1881 | return NULL__null; |
| 1882 | } |
| 1883 | } |
| 1884 | } |
| 1885 | |
| 1886 | // Add an entry to resolution error table to record an error in resolving or |
| 1887 | // validating a nest host. This is used to construct informative error |
| 1888 | // messages when IllegalAccessError's occur. If an entry already exists it will |
| 1889 | // be updated with the nest host error message. |
| 1890 | void SystemDictionary::add_nest_host_error(const constantPoolHandle& pool, |
| 1891 | int which, |
| 1892 | const char* message) { |
| 1893 | unsigned int hash = resolution_errors()->compute_hash(pool, which); |
| 1894 | int index = resolution_errors()->hash_to_index(hash); |
| 1895 | { |
| 1896 | MutexLocker ml(Thread::current(), SystemDictionary_lock); |
| 1897 | ResolutionErrorEntry* entry = resolution_errors()->find_entry(index, hash, pool, which); |
| 1898 | if (entry != NULL__null && entry->nest_host_error() == NULL__null) { |
| 1899 | // An existing entry means we had a true resolution failure (LinkageError) with our nest host, but we |
| 1900 | // still want to add the error message for the higher-level access checks to report. We should |
| 1901 | // only reach here under the same error condition, so we can ignore the potential race with setting |
| 1902 | // the message. If we see it is already set then we can ignore it. |
| 1903 | entry->set_nest_host_error(message); |
| 1904 | } else { |
| 1905 | resolution_errors()->add_entry(index, hash, pool, which, message); |
| 1906 | } |
| 1907 | } |
| 1908 | } |
| 1909 | |
| 1910 | // Lookup any nest host error |
| 1911 | const char* SystemDictionary::find_nest_host_error(const constantPoolHandle& pool, int which) { |
| 1912 | unsigned int hash = resolution_errors()->compute_hash(pool, which); |
| 1913 | int index = resolution_errors()->hash_to_index(hash); |
| 1914 | { |
| 1915 | MutexLocker ml(Thread::current(), SystemDictionary_lock); |
| 1916 | ResolutionErrorEntry* entry = resolution_errors()->find_entry(index, hash, pool, which); |
| 1917 | if (entry != NULL__null) { |
| 1918 | return entry->nest_host_error(); |
| 1919 | } else { |
| 1920 | return NULL__null; |
| 1921 | } |
| 1922 | } |
| 1923 | } |
| 1924 | |
| 1925 | |
| 1926 | // Signature constraints ensure that callers and callees agree about |
| 1927 | // the meaning of type names in their signatures. This routine is the |
| 1928 | // intake for constraints. It collects them from several places: |
| 1929 | // |
| 1930 | // * LinkResolver::resolve_method (if check_access is true) requires |
| 1931 | // that the resolving class (the caller) and the defining class of |
| 1932 | // the resolved method (the callee) agree on each type in the |
| 1933 | // method's signature. |
| 1934 | // |
| 1935 | // * LinkResolver::resolve_interface_method performs exactly the same |
| 1936 | // checks. |
| 1937 | // |
| 1938 | // * LinkResolver::resolve_field requires that the constant pool |
| 1939 | // attempting to link to a field agree with the field's defining |
| 1940 | // class about the type of the field signature. |
| 1941 | // |
| 1942 | // * klassVtable::initialize_vtable requires that, when a class |
| 1943 | // overrides a vtable entry allocated by a superclass, that the |
| 1944 | // overriding method (i.e., the callee) agree with the superclass |
| 1945 | // on each type in the method's signature. |
| 1946 | // |
| 1947 | // * klassItable::initialize_itable requires that, when a class fills |
| 1948 | // in its itables, for each non-abstract method installed in an |
| 1949 | // itable, the method (i.e., the callee) agree with the interface |
| 1950 | // on each type in the method's signature. |
| 1951 | // |
| 1952 | // All those methods have a boolean (check_access, checkconstraints) |
| 1953 | // which turns off the checks. This is used from specialized contexts |
| 1954 | // such as bootstrapping, dumping, and debugging. |
| 1955 | // |
| 1956 | // No direct constraint is placed between the class and its |
| 1957 | // supertypes. Constraints are only placed along linked relations |
| 1958 | // between callers and callees. When a method overrides or implements |
| 1959 | // an abstract method in a supertype (superclass or interface), the |
| 1960 | // constraints are placed as if the supertype were the caller to the |
| 1961 | // overriding method. (This works well, since callers to the |
| 1962 | // supertype have already established agreement between themselves and |
| 1963 | // the supertype.) As a result of all this, a class can disagree with |
| 1964 | // its supertype about the meaning of a type name, as long as that |
| 1965 | // class neither calls a relevant method of the supertype, nor is |
| 1966 | // called (perhaps via an override) from the supertype. |
| 1967 | // |
| 1968 | // |
| 1969 | // SystemDictionary::check_signature_loaders(sig, klass_being_linked, l1, l2) |
| 1970 | // |
| 1971 | // Make sure all class components (including arrays) in the given |
| 1972 | // signature will be resolved to the same class in both loaders. |
| 1973 | // Returns the name of the type that failed a loader constraint check, or |
| 1974 | // NULL if no constraint failed. No exception except OOME is thrown. |
| 1975 | // Arrays are not added to the loader constraint table, their elements are. |
| 1976 | Symbol* SystemDictionary::check_signature_loaders(Symbol* signature, |
| 1977 | Klass* klass_being_linked, |
| 1978 | Handle loader1, Handle loader2, |
| 1979 | bool is_method) { |
| 1980 | // Nothing to do if loaders are the same. |
| 1981 | if (loader1() == loader2()) { |
| 1982 | return NULL__null; |
| 1983 | } |
| 1984 | |
| 1985 | for (SignatureStream ss(signature, is_method); !ss.is_done(); ss.next()) { |
| 1986 | if (ss.is_reference()) { |
| 1987 | Symbol* sig = ss.as_symbol(); |
| 1988 | // Note: In the future, if template-like types can take |
| 1989 | // arguments, we will want to recognize them and dig out class |
| 1990 | // names hiding inside the argument lists. |
| 1991 | if (!add_loader_constraint(sig, klass_being_linked, loader1, loader2)) { |
| 1992 | return sig; |
| 1993 | } |
| 1994 | } |
| 1995 | } |
| 1996 | return NULL__null; |
| 1997 | } |
| 1998 | |
| 1999 | Method* SystemDictionary::find_method_handle_intrinsic(vmIntrinsicID iid, |
| 2000 | Symbol* signature, |
| 2001 | TRAPSJavaThread* __the_thread__) { |
| 2002 | methodHandle empty; |
| 2003 | const int iid_as_int = vmIntrinsics::as_int(iid); |
| 2004 | assert(MethodHandles::is_signature_polymorphic(iid) &&do { if (!(MethodHandles::is_signature_polymorphic(iid) && MethodHandles::is_signature_polymorphic_intrinsic(iid) && iid != vmIntrinsics::_invokeGeneric)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2007, "assert(" "MethodHandles::is_signature_polymorphic(iid) && MethodHandles::is_signature_polymorphic_intrinsic(iid) && iid != vmIntrinsics::_invokeGeneric" ") failed", "must be a known MH intrinsic iid=%d: %s", iid_as_int , vmIntrinsics::name_at(iid)); ::breakpoint(); } } while (0) |
| 2005 | MethodHandles::is_signature_polymorphic_intrinsic(iid) &&do { if (!(MethodHandles::is_signature_polymorphic(iid) && MethodHandles::is_signature_polymorphic_intrinsic(iid) && iid != vmIntrinsics::_invokeGeneric)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2007, "assert(" "MethodHandles::is_signature_polymorphic(iid) && MethodHandles::is_signature_polymorphic_intrinsic(iid) && iid != vmIntrinsics::_invokeGeneric" ") failed", "must be a known MH intrinsic iid=%d: %s", iid_as_int , vmIntrinsics::name_at(iid)); ::breakpoint(); } } while (0) |
| 2006 | iid != vmIntrinsics::_invokeGeneric,do { if (!(MethodHandles::is_signature_polymorphic(iid) && MethodHandles::is_signature_polymorphic_intrinsic(iid) && iid != vmIntrinsics::_invokeGeneric)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2007, "assert(" "MethodHandles::is_signature_polymorphic(iid) && MethodHandles::is_signature_polymorphic_intrinsic(iid) && iid != vmIntrinsics::_invokeGeneric" ") failed", "must be a known MH intrinsic iid=%d: %s", iid_as_int , vmIntrinsics::name_at(iid)); ::breakpoint(); } } while (0) |
| 2007 | "must be a known MH intrinsic iid=%d: %s", iid_as_int, vmIntrinsics::name_at(iid))do { if (!(MethodHandles::is_signature_polymorphic(iid) && MethodHandles::is_signature_polymorphic_intrinsic(iid) && iid != vmIntrinsics::_invokeGeneric)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2007, "assert(" "MethodHandles::is_signature_polymorphic(iid) && MethodHandles::is_signature_polymorphic_intrinsic(iid) && iid != vmIntrinsics::_invokeGeneric" ") failed", "must be a known MH intrinsic iid=%d: %s", iid_as_int , vmIntrinsics::name_at(iid)); ::breakpoint(); } } while (0); |
| 2008 | |
| 2009 | unsigned int hash = invoke_method_table()->compute_hash(signature, iid_as_int); |
| 2010 | int index = invoke_method_table()->hash_to_index(hash); |
| 2011 | SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, iid_as_int); |
| 2012 | methodHandle m; |
| 2013 | if (spe == NULL__null || spe->method() == NULL__null) { |
| 2014 | spe = NULL__null; |
| 2015 | // Must create lots of stuff here, but outside of the SystemDictionary lock. |
| 2016 | m = Method::make_method_handle_intrinsic(iid, signature, CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 2017 | if (!Arguments::is_interpreter_only()) { |
| 2018 | // Generate a compiled form of the MH intrinsic. |
| 2019 | AdapterHandlerLibrary::create_native_wrapper(m); |
| 2020 | // Check if have the compiled code. |
| 2021 | if (!m->has_compiled_code()) { |
| 2022 | THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(),{ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2023, vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for method handle intrinsic" ); return __null; } |
| 2023 | "Out of space in CodeCache for method handle intrinsic"){ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2023, vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for method handle intrinsic" ); return __null; }; |
| 2024 | } |
| 2025 | } |
| 2026 | // Now grab the lock. We might have to throw away the new method, |
| 2027 | // if a racing thread has managed to install one at the same time. |
| 2028 | { |
| 2029 | MutexLocker ml(THREAD__the_thread__, SystemDictionary_lock); |
| 2030 | spe = invoke_method_table()->find_entry(index, hash, signature, iid_as_int); |
| 2031 | if (spe == NULL__null) |
| 2032 | spe = invoke_method_table()->add_entry(index, hash, signature, iid_as_int); |
| 2033 | if (spe->method() == NULL__null) |
| 2034 | spe->set_method(m()); |
| 2035 | } |
| 2036 | } |
| 2037 | |
| 2038 | assert(spe != NULL && spe->method() != NULL, "")do { if (!(spe != __null && spe->method() != __null )) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2038, "assert(" "spe != __null && spe->method() != __null" ") failed", ""); ::breakpoint(); } } while (0); |
| 2039 | assert(Arguments::is_interpreter_only() || (spe->method()->has_compiled_code() &&do { if (!(Arguments::is_interpreter_only() || (spe->method ()->has_compiled_code() && spe->method()->code ()->entry_point() == spe->method()->from_compiled_entry ()))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2041, "assert(" "Arguments::is_interpreter_only() || (spe->method()->has_compiled_code() && spe->method()->code()->entry_point() == spe->method()->from_compiled_entry())" ") failed", "MH intrinsic invariant"); ::breakpoint(); } } while (0) |
| 2040 | spe->method()->code()->entry_point() == spe->method()->from_compiled_entry()),do { if (!(Arguments::is_interpreter_only() || (spe->method ()->has_compiled_code() && spe->method()->code ()->entry_point() == spe->method()->from_compiled_entry ()))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2041, "assert(" "Arguments::is_interpreter_only() || (spe->method()->has_compiled_code() && spe->method()->code()->entry_point() == spe->method()->from_compiled_entry())" ") failed", "MH intrinsic invariant"); ::breakpoint(); } } while (0) |
| 2041 | "MH intrinsic invariant")do { if (!(Arguments::is_interpreter_only() || (spe->method ()->has_compiled_code() && spe->method()->code ()->entry_point() == spe->method()->from_compiled_entry ()))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2041, "assert(" "Arguments::is_interpreter_only() || (spe->method()->has_compiled_code() && spe->method()->code()->entry_point() == spe->method()->from_compiled_entry())" ") failed", "MH intrinsic invariant"); ::breakpoint(); } } while (0); |
| 2042 | return spe->method(); |
| 2043 | } |
| 2044 | |
| 2045 | // Helper for unpacking the return value from linkMethod and linkCallSite. |
| 2046 | static Method* unpack_method_and_appendix(Handle mname, |
| 2047 | Klass* accessing_klass, |
| 2048 | objArrayHandle appendix_box, |
| 2049 | Handle* appendix_result, |
| 2050 | TRAPSJavaThread* __the_thread__) { |
| 2051 | if (mname.not_null()) { |
| 2052 | Method* m = java_lang_invoke_MemberName::vmtarget(mname()); |
| 2053 | if (m != NULL__null) { |
| 2054 | oop appendix = appendix_box->obj_at(0); |
| 2055 | LogTarget(Info, methodhandles)LogTargetImpl<LogLevel::Info, (LogTag::_methodhandles), (LogTag ::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag:: __NO_TAG), (LogTag::__NO_TAG)> lt; |
| 2056 | if (lt.develop_is_enabled()) { |
| 2057 | ResourceMark rm(THREAD__the_thread__); |
| 2058 | LogStream ls(lt); |
| 2059 | ls.print("Linked method=" INTPTR_FORMAT"0x%016" "l" "x" ": ", p2i(m)); |
| 2060 | m->print_on(&ls); |
| 2061 | if (appendix != NULL__null) { ls.print("appendix = "); appendix->print_on(&ls); } |
| 2062 | ls.cr(); |
| 2063 | } |
| 2064 | |
| 2065 | (*appendix_result) = Handle(THREAD__the_thread__, appendix); |
| 2066 | // the target is stored in the cpCache and if a reference to this |
| 2067 | // MemberName is dropped we need a way to make sure the |
| 2068 | // class_loader containing this method is kept alive. |
| 2069 | methodHandle mh(THREAD__the_thread__, m); // record_dependency can safepoint. |
| 2070 | ClassLoaderData* this_key = accessing_klass->class_loader_data(); |
| 2071 | this_key->record_dependency(m->method_holder()); |
| 2072 | return mh(); |
| 2073 | } |
| 2074 | } |
| 2075 | THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "bad value from MethodHandleNatives"){ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2075, vmSymbols::java_lang_LinkageError(), "bad value from MethodHandleNatives" ); return __null; }; |
| 2076 | } |
| 2077 | |
| 2078 | Method* SystemDictionary::find_method_handle_invoker(Klass* klass, |
| 2079 | Symbol* name, |
| 2080 | Symbol* signature, |
| 2081 | Klass* accessing_klass, |
| 2082 | Handle *appendix_result, |
| 2083 | TRAPSJavaThread* __the_thread__) { |
| 2084 | assert(THREAD->can_call_java() ,"")do { if (!(__the_thread__->can_call_java())) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2084, "assert(" "__the_thread__->can_call_java()" ") failed" , ""); ::breakpoint(); } } while (0); |
| 2085 | Handle method_type = |
| 2086 | SystemDictionary::find_method_handle_type(signature, accessing_klass, CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 2087 | |
| 2088 | int ref_kind = JVM_REF_invokeVirtual; |
| 2089 | oop name_oop = StringTable::intern(name, CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 2090 | Handle name_str (THREAD__the_thread__, name_oop); |
| 2091 | objArrayHandle appendix_box = oopFactory::new_objArray_handle(vmClasses::Object_klass(), 1, CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 2092 | assert(appendix_box->obj_at(0) == NULL, "")do { if (!(appendix_box->obj_at(0) == __null)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2092, "assert(" "appendix_box->obj_at(0) == __null" ") failed" , ""); ::breakpoint(); } } while (0); |
| 2093 | |
| 2094 | // This should not happen. JDK code should take care of that. |
| 2095 | if (accessing_klass == NULL__null || method_type.is_null()) { |
| 2096 | THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "bad invokehandle"){ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2096, vmSymbols::java_lang_InternalError(), "bad invokehandle" ); return __null; }; |
| 2097 | } |
| 2098 | |
| 2099 | // call java.lang.invoke.MethodHandleNatives::linkMethod(... String, MethodType) -> MemberName |
| 2100 | JavaCallArguments args; |
| 2101 | args.push_oop(Handle(THREAD__the_thread__, accessing_klass->java_mirror())); |
| 2102 | args.push_int(ref_kind); |
| 2103 | args.push_oop(Handle(THREAD__the_thread__, klass->java_mirror())); |
| 2104 | args.push_oop(name_str); |
| 2105 | args.push_oop(method_type); |
| 2106 | args.push_oop(appendix_box); |
| 2107 | JavaValue result(T_OBJECT); |
| 2108 | JavaCalls::call_static(&result, |
| 2109 | vmClasses::MethodHandleNatives_klass(), |
| 2110 | vmSymbols::linkMethod_name(), |
| 2111 | vmSymbols::linkMethod_signature(), |
| 2112 | &args, CHECK_NULL__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return __null; (void)(0); |
| 2113 | Handle mname(THREAD__the_thread__, result.get_oop()); |
| 2114 | return unpack_method_and_appendix(mname, accessing_klass, appendix_box, appendix_result, THREAD__the_thread__); |
| 2115 | } |
| 2116 | |
| 2117 | // Decide if we can globally cache a lookup of this class, to be returned to any client that asks. |
| 2118 | // We must ensure that all class loaders everywhere will reach this class, for any client. |
| 2119 | // This is a safe bet for public classes in java.lang, such as Object and String. |
| 2120 | // We also include public classes in java.lang.invoke, because they appear frequently in system-level method types. |
| 2121 | // Out of an abundance of caution, we do not include any other classes, not even for packages like java.util. |
| 2122 | static bool is_always_visible_class(oop mirror) { |
| 2123 | Klass* klass = java_lang_Class::as_Klass(mirror); |
| 2124 | if (klass->is_objArray_klass()) { |
| 2125 | klass = ObjArrayKlass::cast(klass)->bottom_klass(); // check element type |
| 2126 | } |
| 2127 | if (klass->is_typeArray_klass()) { |
| 2128 | return true; // primitive array |
| 2129 | } |
| 2130 | assert(klass->is_instance_klass(), "%s", klass->external_name())do { if (!(klass->is_instance_klass())) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2130, "assert(" "klass->is_instance_klass()" ") failed", "%s", klass->external_name()); ::breakpoint(); } } while ( 0); |
| 2131 | return klass->is_public() && |
| 2132 | (InstanceKlass::cast(klass)->is_same_class_package(vmClasses::Object_klass()) || // java.lang |
| 2133 | InstanceKlass::cast(klass)->is_same_class_package(vmClasses::MethodHandle_klass())); // java.lang.invoke |
| 2134 | } |
| 2135 | |
| 2136 | // Find or construct the Java mirror (java.lang.Class instance) for |
| 2137 | // the given field type signature, as interpreted relative to the |
| 2138 | // given class loader. Handles primitives, void, references, arrays, |
| 2139 | // and all other reflectable types, except method types. |
| 2140 | // N.B. Code in reflection should use this entry point. |
| 2141 | Handle SystemDictionary::find_java_mirror_for_type(Symbol* signature, |
| 2142 | Klass* accessing_klass, |
| 2143 | Handle class_loader, |
| 2144 | Handle protection_domain, |
| 2145 | SignatureStream::FailureMode failure_mode, |
| 2146 | TRAPSJavaThread* __the_thread__) { |
| 2147 | assert(accessing_klass == NULL || (class_loader.is_null() && protection_domain.is_null()),do { if (!(accessing_klass == __null || (class_loader.is_null () && protection_domain.is_null()))) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2148, "assert(" "accessing_klass == __null || (class_loader.is_null() && protection_domain.is_null())" ") failed", "one or the other, or perhaps neither"); ::breakpoint (); } } while (0) |
| 2148 | "one or the other, or perhaps neither")do { if (!(accessing_klass == __null || (class_loader.is_null () && protection_domain.is_null()))) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2148, "assert(" "accessing_klass == __null || (class_loader.is_null() && protection_domain.is_null())" ") failed", "one or the other, or perhaps neither"); ::breakpoint (); } } while (0); |
| 2149 | |
| 2150 | // What we have here must be a valid field descriptor, |
| 2151 | // and all valid field descriptors are supported. |
| 2152 | // Produce the same java.lang.Class that reflection reports. |
| 2153 | if (accessing_klass != NULL__null) { |
| 2154 | class_loader = Handle(THREAD__the_thread__, accessing_klass->class_loader()); |
| 2155 | protection_domain = Handle(THREAD__the_thread__, accessing_klass->protection_domain()); |
| 2156 | } |
| 2157 | ResolvingSignatureStream ss(signature, class_loader, protection_domain, false); |
| 2158 | oop mirror_oop = ss.as_java_mirror(failure_mode, CHECK_NH__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return Handle(); (void)(0); |
| 2159 | if (mirror_oop == NULL__null) { |
| 2160 | return Handle(); // report failure this way |
| 2161 | } |
| 2162 | Handle mirror(THREAD__the_thread__, mirror_oop); |
| 2163 | |
| 2164 | if (accessing_klass != NULL__null) { |
| 2165 | // Check accessibility, emulating ConstantPool::verify_constant_pool_resolve. |
| 2166 | Klass* sel_klass = java_lang_Class::as_Klass(mirror()); |
| 2167 | if (sel_klass != NULL__null) { |
| 2168 | LinkResolver::check_klass_accessibility(accessing_klass, sel_klass, CHECK_NH__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return Handle(); (void)(0); |
| 2169 | } |
| 2170 | } |
| 2171 | return mirror; |
| 2172 | } |
| 2173 | |
| 2174 | |
| 2175 | // Ask Java code to find or construct a java.lang.invoke.MethodType for the given |
| 2176 | // signature, as interpreted relative to the given class loader. |
| 2177 | // Because of class loader constraints, all method handle usage must be |
| 2178 | // consistent with this loader. |
| 2179 | Handle SystemDictionary::find_method_handle_type(Symbol* signature, |
| 2180 | Klass* accessing_klass, |
| 2181 | TRAPSJavaThread* __the_thread__) { |
| 2182 | Handle empty; |
| 2183 | int null_iid = vmIntrinsics::as_int(vmIntrinsics::_none); // distinct from all method handle invoker intrinsics |
| 2184 | unsigned int hash = invoke_method_table()->compute_hash(signature, null_iid); |
| 2185 | int index = invoke_method_table()->hash_to_index(hash); |
| 2186 | SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, null_iid); |
| 2187 | if (spe != NULL__null && spe->method_type() != NULL__null) { |
| 2188 | assert(java_lang_invoke_MethodType::is_instance(spe->method_type()), "")do { if (!(java_lang_invoke_MethodType::is_instance(spe->method_type ()))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2188, "assert(" "java_lang_invoke_MethodType::is_instance(spe->method_type())" ") failed", ""); ::breakpoint(); } } while (0); |
| 2189 | return Handle(THREAD__the_thread__, spe->method_type()); |
| 2190 | } else if (!THREAD__the_thread__->can_call_java()) { |
| 2191 | warning("SystemDictionary::find_method_handle_type called from compiler thread"); // FIXME |
| 2192 | return Handle(); // do not attempt from within compiler, unless it was cached |
| 2193 | } |
| 2194 | |
| 2195 | Handle class_loader, protection_domain; |
| 2196 | if (accessing_klass != NULL__null) { |
| 2197 | class_loader = Handle(THREAD__the_thread__, accessing_klass->class_loader()); |
| 2198 | protection_domain = Handle(THREAD__the_thread__, accessing_klass->protection_domain()); |
| 2199 | } |
| 2200 | bool can_be_cached = true; |
| 2201 | int npts = ArgumentCount(signature).size(); |
| 2202 | objArrayHandle pts = oopFactory::new_objArray_handle(vmClasses::Class_klass(), npts, CHECK_(empty)__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return empty; (void)(0); |
| 2203 | int arg = 0; |
| 2204 | Handle rt; // the return type from the signature |
| 2205 | ResourceMark rm(THREAD__the_thread__); |
| 2206 | for (SignatureStream ss(signature); !ss.is_done(); ss.next()) { |
| 2207 | oop mirror = NULL__null; |
| 2208 | if (can_be_cached) { |
| 2209 | // Use neutral class loader to lookup candidate classes to be placed in the cache. |
| 2210 | mirror = ss.as_java_mirror(Handle(), Handle(), |
| 2211 | SignatureStream::ReturnNull, CHECK_(empty)__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return empty; (void)(0); |
| 2212 | if (mirror == NULL__null || (ss.is_reference() && !is_always_visible_class(mirror))) { |
| 2213 | // Fall back to accessing_klass context. |
| 2214 | can_be_cached = false; |
| 2215 | } |
| 2216 | } |
| 2217 | if (!can_be_cached) { |
| 2218 | // Resolve, throwing a real error if it doesn't work. |
| 2219 | mirror = ss.as_java_mirror(class_loader, protection_domain, |
| 2220 | SignatureStream::NCDFError, CHECK_(empty)__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return empty; (void)(0); |
| 2221 | } |
| 2222 | assert(mirror != NULL, "%s", ss.as_symbol()->as_C_string())do { if (!(mirror != __null)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2222, "assert(" "mirror != __null" ") failed", "%s", ss.as_symbol ()->as_C_string()); ::breakpoint(); } } while (0); |
| 2223 | if (ss.at_return_type()) |
| 2224 | rt = Handle(THREAD__the_thread__, mirror); |
| 2225 | else |
| 2226 | pts->obj_at_put(arg++, mirror); |
| 2227 | |
| 2228 | // Check accessibility. |
| 2229 | if (!java_lang_Class::is_primitive(mirror) && accessing_klass != NULL__null) { |
| 2230 | Klass* sel_klass = java_lang_Class::as_Klass(mirror); |
| 2231 | mirror = NULL__null; // safety |
| 2232 | // Emulate ConstantPool::verify_constant_pool_resolve. |
| 2233 | LinkResolver::check_klass_accessibility(accessing_klass, sel_klass, CHECK_(empty)__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return empty; (void)(0); |
| 2234 | } |
| 2235 | } |
| 2236 | assert(arg == npts, "")do { if (!(arg == npts)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2236, "assert(" "arg == npts" ") failed", ""); ::breakpoint (); } } while (0); |
| 2237 | |
| 2238 | // call java.lang.invoke.MethodHandleNatives::findMethodHandleType(Class rt, Class[] pts) -> MethodType |
| 2239 | JavaCallArguments args(Handle(THREAD__the_thread__, rt())); |
| 2240 | args.push_oop(pts); |
| 2241 | JavaValue result(T_OBJECT); |
| 2242 | JavaCalls::call_static(&result, |
| 2243 | vmClasses::MethodHandleNatives_klass(), |
| 2244 | vmSymbols::findMethodHandleType_name(), |
| 2245 | vmSymbols::findMethodHandleType_signature(), |
| 2246 | &args, CHECK_(empty)__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return empty; (void)(0); |
| 2247 | Handle method_type(THREAD__the_thread__, result.get_oop()); |
| 2248 | |
| 2249 | if (can_be_cached) { |
| 2250 | // We can cache this MethodType inside the JVM. |
| 2251 | MutexLocker ml(THREAD__the_thread__, SystemDictionary_lock); |
| 2252 | spe = invoke_method_table()->find_entry(index, hash, signature, null_iid); |
| 2253 | if (spe == NULL__null) |
| 2254 | spe = invoke_method_table()->add_entry(index, hash, signature, null_iid); |
| 2255 | if (spe->method_type() == NULL__null) { |
| 2256 | spe->set_method_type(method_type()); |
| 2257 | } |
| 2258 | } |
| 2259 | |
| 2260 | // report back to the caller with the MethodType |
| 2261 | return method_type; |
| 2262 | } |
| 2263 | |
| 2264 | Handle SystemDictionary::find_field_handle_type(Symbol* signature, |
| 2265 | Klass* accessing_klass, |
| 2266 | TRAPSJavaThread* __the_thread__) { |
| 2267 | Handle empty; |
| 2268 | ResourceMark rm(THREAD__the_thread__); |
| 2269 | SignatureStream ss(signature, /*is_method=*/ false); |
| 2270 | if (!ss.is_done()) { |
| 2271 | Handle class_loader, protection_domain; |
| 2272 | if (accessing_klass != NULL__null) { |
| 2273 | class_loader = Handle(THREAD__the_thread__, accessing_klass->class_loader()); |
| 2274 | protection_domain = Handle(THREAD__the_thread__, accessing_klass->protection_domain()); |
| 2275 | } |
| 2276 | oop mirror = ss.as_java_mirror(class_loader, protection_domain, SignatureStream::NCDFError, CHECK_(empty)__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return empty; (void)(0); |
| 2277 | ss.next(); |
| 2278 | if (ss.is_done()) { |
| 2279 | return Handle(THREAD__the_thread__, mirror); |
| 2280 | } |
| 2281 | } |
| 2282 | return empty; |
| 2283 | } |
| 2284 | |
| 2285 | // Ask Java code to find or construct a method handle constant. |
| 2286 | Handle SystemDictionary::link_method_handle_constant(Klass* caller, |
| 2287 | int ref_kind, //e.g., JVM_REF_invokeVirtual |
| 2288 | Klass* callee, |
| 2289 | Symbol* name, |
| 2290 | Symbol* signature, |
| 2291 | TRAPSJavaThread* __the_thread__) { |
| 2292 | Handle empty; |
| 2293 | if (caller == NULL__null) { |
| 2294 | THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MH constant", empty){ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2294, vmSymbols::java_lang_InternalError(), "bad MH constant" ); return empty; }; |
| 2295 | } |
| 2296 | Handle name_str = java_lang_String::create_from_symbol(name, CHECK_(empty)__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return empty; (void)(0); |
| 2297 | Handle signature_str = java_lang_String::create_from_symbol(signature, CHECK_(empty)__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return empty; (void)(0); |
| 2298 | |
| 2299 | // Put symbolic info from the MH constant into freshly created MemberName and resolve it. |
| 2300 | Handle mname = vmClasses::MemberName_klass()->allocate_instance_handle(CHECK_(empty)__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return empty; (void)(0); |
| 2301 | java_lang_invoke_MemberName::set_clazz(mname(), callee->java_mirror()); |
| 2302 | java_lang_invoke_MemberName::set_name (mname(), name_str()); |
| 2303 | java_lang_invoke_MemberName::set_type (mname(), signature_str()); |
| 2304 | java_lang_invoke_MemberName::set_flags(mname(), MethodHandles::ref_kind_to_flags(ref_kind)); |
| 2305 | |
| 2306 | if (ref_kind == JVM_REF_invokeVirtual && |
| 2307 | MethodHandles::is_signature_polymorphic_public_name(callee, name)) { |
| 2308 | // Skip resolution for public signature polymorphic methods such as |
| 2309 | // j.l.i.MethodHandle.invoke()/invokeExact() and those on VarHandle |
| 2310 | // They require appendix argument which MemberName resolution doesn't handle. |
| 2311 | // There's special logic on JDK side to handle them |
| 2312 | // (see MethodHandles.linkMethodHandleConstant() and MethodHandles.findVirtualForMH()). |
| 2313 | } else { |
| 2314 | MethodHandles::resolve_MemberName(mname, caller, 0, false /*speculative_resolve*/, CHECK_(empty)__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return empty; (void)(0); |
| 2315 | } |
| 2316 | |
| 2317 | // After method/field resolution succeeded, it's safe to resolve MH signature as well. |
| 2318 | Handle type = MethodHandles::resolve_MemberName_type(mname, caller, CHECK_(empty)__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return empty; (void)(0); |
| 2319 | |
| 2320 | // call java.lang.invoke.MethodHandleNatives::linkMethodHandleConstant(Class caller, int refKind, Class callee, String name, Object type) -> MethodHandle |
| 2321 | JavaCallArguments args; |
| 2322 | args.push_oop(Handle(THREAD__the_thread__, caller->java_mirror())); // the referring class |
| 2323 | args.push_int(ref_kind); |
| 2324 | args.push_oop(Handle(THREAD__the_thread__, callee->java_mirror())); // the target class |
| 2325 | args.push_oop(name_str); |
| 2326 | args.push_oop(type); |
| 2327 | JavaValue result(T_OBJECT); |
| 2328 | JavaCalls::call_static(&result, |
| 2329 | vmClasses::MethodHandleNatives_klass(), |
| 2330 | vmSymbols::linkMethodHandleConstant_name(), |
| 2331 | vmSymbols::linkMethodHandleConstant_signature(), |
| 2332 | &args, CHECK_(empty)__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return empty; (void)(0); |
| 2333 | return Handle(THREAD__the_thread__, result.get_oop()); |
| 2334 | } |
| 2335 | |
| 2336 | // Ask Java to run a bootstrap method, in order to create a dynamic call site |
| 2337 | // while linking an invokedynamic op, or compute a constant for Dynamic_info CP entry |
| 2338 | // with linkage results being stored back into the bootstrap specifier. |
| 2339 | void SystemDictionary::invoke_bootstrap_method(BootstrapInfo& bootstrap_specifier, TRAPSJavaThread* __the_thread__) { |
| 2340 | // Resolve the bootstrap specifier, its name, type, and static arguments |
| 2341 | bootstrap_specifier.resolve_bsm(CHECK__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return ; (void)(0); |
| 2342 | |
| 2343 | // This should not happen. JDK code should take care of that. |
| 2344 | if (bootstrap_specifier.caller() == NULL__null || bootstrap_specifier.type_arg().is_null()) { |
| 2345 | THROW_MSG(vmSymbols::java_lang_InternalError(), "Invalid bootstrap method invocation with no caller or type argument"){ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2345, vmSymbols::java_lang_InternalError(), "Invalid bootstrap method invocation with no caller or type argument" ); return; }; |
| 2346 | } |
| 2347 | |
| 2348 | bool is_indy = bootstrap_specifier.is_method_call(); |
| 2349 | objArrayHandle appendix_box; |
| 2350 | if (is_indy) { |
| 2351 | // Some method calls may require an appendix argument. Arrange to receive it. |
| 2352 | appendix_box = oopFactory::new_objArray_handle(vmClasses::Object_klass(), 1, CHECK__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return ; (void)(0); |
| 2353 | assert(appendix_box->obj_at(0) == NULL, "")do { if (!(appendix_box->obj_at(0) == __null)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2353, "assert(" "appendix_box->obj_at(0) == __null" ") failed" , ""); ::breakpoint(); } } while (0); |
| 2354 | } |
| 2355 | |
| 2356 | // call condy: java.lang.invoke.MethodHandleNatives::linkDynamicConstant(caller, bsm, type, info) |
| 2357 | // indy: java.lang.invoke.MethodHandleNatives::linkCallSite(caller, bsm, name, mtype, info, &appendix) |
| 2358 | JavaCallArguments args; |
| 2359 | args.push_oop(Handle(THREAD__the_thread__, bootstrap_specifier.caller_mirror())); |
| 2360 | args.push_oop(bootstrap_specifier.bsm()); |
| 2361 | args.push_oop(bootstrap_specifier.name_arg()); |
| 2362 | args.push_oop(bootstrap_specifier.type_arg()); |
| 2363 | args.push_oop(bootstrap_specifier.arg_values()); |
| 2364 | if (is_indy) { |
| 2365 | args.push_oop(appendix_box); |
| 2366 | } |
| 2367 | JavaValue result(T_OBJECT); |
| 2368 | JavaCalls::call_static(&result, |
| 2369 | vmClasses::MethodHandleNatives_klass(), |
| 2370 | is_indy ? vmSymbols::linkCallSite_name() : vmSymbols::linkDynamicConstant_name(), |
| 2371 | is_indy ? vmSymbols::linkCallSite_signature() : vmSymbols::linkDynamicConstant_signature(), |
| 2372 | &args, CHECK__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return ; (void)(0); |
| 2373 | |
| 2374 | Handle value(THREAD__the_thread__, result.get_oop()); |
| 2375 | if (is_indy) { |
| 2376 | Handle appendix; |
| 2377 | Method* method = unpack_method_and_appendix(value, |
| 2378 | bootstrap_specifier.caller(), |
| 2379 | appendix_box, |
| 2380 | &appendix, CHECK__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return ; (void)(0); |
| 2381 | methodHandle mh(THREAD__the_thread__, method); |
| 2382 | bootstrap_specifier.set_resolved_method(mh, appendix); |
| 2383 | } else { |
| 2384 | bootstrap_specifier.set_resolved_value(value); |
| 2385 | } |
| 2386 | |
| 2387 | // sanity check |
| 2388 | assert(bootstrap_specifier.is_resolved() ||do { if (!(bootstrap_specifier.is_resolved() || (bootstrap_specifier .is_method_call() && bootstrap_specifier.resolved_method ().not_null()))) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2390, "assert(" "bootstrap_specifier.is_resolved() || (bootstrap_specifier.is_method_call() && bootstrap_specifier.resolved_method().not_null())" ") failed", "bootstrap method call failed"); ::breakpoint(); } } while (0) |
| 2389 | (bootstrap_specifier.is_method_call() &&do { if (!(bootstrap_specifier.is_resolved() || (bootstrap_specifier .is_method_call() && bootstrap_specifier.resolved_method ().not_null()))) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2390, "assert(" "bootstrap_specifier.is_resolved() || (bootstrap_specifier.is_method_call() && bootstrap_specifier.resolved_method().not_null())" ") failed", "bootstrap method call failed"); ::breakpoint(); } } while (0) |
| 2390 | bootstrap_specifier.resolved_method().not_null()), "bootstrap method call failed")do { if (!(bootstrap_specifier.is_resolved() || (bootstrap_specifier .is_method_call() && bootstrap_specifier.resolved_method ().not_null()))) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2390, "assert(" "bootstrap_specifier.is_resolved() || (bootstrap_specifier.is_method_call() && bootstrap_specifier.resolved_method().not_null())" ") failed", "bootstrap method call failed"); ::breakpoint(); } } while (0); |
| 2391 | } |
| 2392 | |
| 2393 | |
| 2394 | ClassLoaderData* SystemDictionary::class_loader_data(Handle class_loader) { |
| 2395 | return ClassLoaderData::class_loader_data(class_loader()); |
| 2396 | } |
| 2397 | |
| 2398 | bool SystemDictionary::is_nonpublic_Object_method(Method* m) { |
| 2399 | assert(m != NULL, "Unexpected NULL Method*")do { if (!(m != __null)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2399, "assert(" "m != __null" ") failed", "Unexpected NULL Method*" ); ::breakpoint(); } } while (0); |
| 2400 | return !m->is_public() && m->method_holder() == vmClasses::Object_klass(); |
| 2401 | } |
| 2402 | |
| 2403 | // ---------------------------------------------------------------------------- |
| 2404 | |
| 2405 | void SystemDictionary::print_on(outputStream *st) { |
| 2406 | CDS_ONLY(SystemDictionaryShared::print_on(st))SystemDictionaryShared::print_on(st); |
| 2407 | GCMutexLocker mu(SystemDictionary_lock); |
| 2408 | |
| 2409 | ClassLoaderDataGraph::print_dictionary(st); |
| 2410 | |
| 2411 | // Placeholders |
| 2412 | placeholders()->print_on(st); |
| 2413 | st->cr(); |
| 2414 | |
| 2415 | // loader constraints - print under SD_lock |
| 2416 | constraints()->print_on(st); |
| 2417 | st->cr(); |
| 2418 | |
| 2419 | _pd_cache_table->print_on(st); |
| 2420 | st->cr(); |
| 2421 | } |
| 2422 | |
| 2423 | void SystemDictionary::print() { print_on(tty); } |
| 2424 | |
| 2425 | void SystemDictionary::verify() { |
| 2426 | guarantee(constraints() != NULL,do { if (!(constraints() != __null)) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2427, "guarantee(" "constraints() != NULL" ") failed", "Verify of loader constraints failed" ); ::breakpoint(); } } while (0) |
| 2427 | "Verify of loader constraints failed")do { if (!(constraints() != __null)) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2427, "guarantee(" "constraints() != NULL" ") failed", "Verify of loader constraints failed" ); ::breakpoint(); } } while (0); |
| 2428 | guarantee(placeholders()->number_of_entries() >= 0,do { if (!(placeholders()->number_of_entries() >= 0)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2429, "guarantee(" "placeholders()->number_of_entries() >= 0" ") failed", "Verify of placeholders failed"); ::breakpoint() ; } } while (0) |
| 2429 | "Verify of placeholders failed")do { if (!(placeholders()->number_of_entries() >= 0)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2429, "guarantee(" "placeholders()->number_of_entries() >= 0" ") failed", "Verify of placeholders failed"); ::breakpoint() ; } } while (0); |
| 2430 | |
| 2431 | GCMutexLocker mu(SystemDictionary_lock); |
| 2432 | |
| 2433 | // Verify dictionary |
| 2434 | ClassLoaderDataGraph::verify_dictionary(); |
| 2435 | |
| 2436 | placeholders()->verify(); |
| 2437 | |
| 2438 | // Verify constraint table |
| 2439 | guarantee(constraints() != NULL, "Verify of loader constraints failed")do { if (!(constraints() != __null)) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/classfile/systemDictionary.cpp" , 2439, "guarantee(" "constraints() != NULL" ") failed", "Verify of loader constraints failed" ); ::breakpoint(); } } while (0); |
| 2440 | constraints()->verify(placeholders()); |
| 2441 | |
| 2442 | _pd_cache_table->verify(); |
| 2443 | } |
| 2444 | |
| 2445 | void SystemDictionary::dump(outputStream *st, bool verbose) { |
| 2446 | assert_locked_or_safepoint(SystemDictionary_lock); |
| 2447 | if (verbose) { |
| 2448 | print_on(st); |
| 2449 | } else { |
| 2450 | CDS_ONLY(SystemDictionaryShared::print_table_statistics(st))SystemDictionaryShared::print_table_statistics(st); |
| 2451 | ClassLoaderDataGraph::print_table_statistics(st); |
| 2452 | placeholders()->print_table_statistics(st, "Placeholder Table"); |
| 2453 | constraints()->print_table_statistics(st, "LoaderConstraints Table"); |
| 2454 | pd_cache_table()->print_table_statistics(st, "ProtectionDomainCache Table"); |
| 2455 | } |
| 2456 | } |
| 2457 | |
| 2458 | TableStatistics SystemDictionary::placeholders_statistics() { |
| 2459 | MutexLocker ml(SystemDictionary_lock); |
| 2460 | return placeholders()->statistics_calculate(); |
| 2461 | } |
| 2462 | |
| 2463 | TableStatistics SystemDictionary::loader_constraints_statistics() { |
| 2464 | MutexLocker ml(SystemDictionary_lock); |
| 2465 | return constraints()->statistics_calculate(); |
| 2466 | } |
| 2467 | |
| 2468 | TableStatistics SystemDictionary::protection_domain_cache_statistics() { |
| 2469 | MutexLocker ml(SystemDictionary_lock); |
| 2470 | return pd_cache_table()->statistics_calculate(); |
| 2471 | } |
| 2472 | |
| 2473 | // Utility for dumping dictionaries. |
| 2474 | SystemDictionaryDCmd::SystemDictionaryDCmd(outputStream* output, bool heap) : |
| 2475 | DCmdWithParser(output, heap), |
| 2476 | _verbose("-verbose", "Dump the content of each dictionary entry for all class loaders", |
| 2477 | "BOOLEAN", false, "false") { |
| 2478 | _dcmdparser.add_dcmd_option(&_verbose); |
| 2479 | } |
| 2480 | |
| 2481 | void SystemDictionaryDCmd::execute(DCmdSource source, TRAPSJavaThread* __the_thread__) { |
| 2482 | VM_DumpHashtable dumper(output(), VM_DumpHashtable::DumpSysDict, |
| 2483 | _verbose.value()); |
| 2484 | VMThread::execute(&dumper); |
| 2485 | } |