Mercurial > hg > truffle
annotate src/share/vm/classfile/systemDictionary.cpp @ 6266:1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
6984705: JSR 292 method handle creation should not go through JNI
Summary: remove assembly code for JDK 7 chained method handles
Reviewed-by: jrose, twisti, kvn, mhaupt
Contributed-by: John Rose <john.r.rose@oracle.com>, Christian Thalinger <christian.thalinger@oracle.com>, Michael Haupt <michael.haupt@oracle.com>
| author | twisti |
|---|---|
| date | Tue, 24 Jul 2012 10:51:00 -0700 |
| parents | e74da3c2b827 |
| children | 957c266d8bc5 da91efe96a93 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/dictionary.hpp" | |
| 27 #include "classfile/javaClasses.hpp" | |
| 28 #include "classfile/loaderConstraints.hpp" | |
| 29 #include "classfile/placeholders.hpp" | |
| 30 #include "classfile/resolutionErrors.hpp" | |
| 31 #include "classfile/systemDictionary.hpp" | |
| 32 #include "classfile/vmSymbols.hpp" | |
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33 #include "compiler/compileBroker.hpp" |
| 1972 | 34 #include "interpreter/bytecodeStream.hpp" |
| 35 #include "interpreter/interpreter.hpp" | |
| 36 #include "memory/gcLocker.hpp" | |
| 37 #include "memory/oopFactory.hpp" | |
| 38 #include "oops/instanceKlass.hpp" | |
| 39 #include "oops/instanceRefKlass.hpp" | |
| 40 #include "oops/klass.inline.hpp" | |
| 41 #include "oops/methodDataOop.hpp" | |
| 42 #include "oops/objArrayKlass.hpp" | |
| 43 #include "oops/oop.inline.hpp" | |
| 44 #include "oops/oop.inline2.hpp" | |
| 45 #include "oops/typeArrayKlass.hpp" | |
| 46 #include "prims/jvmtiEnvBase.hpp" | |
| 47 #include "prims/methodHandles.hpp" | |
| 48 #include "runtime/biasedLocking.hpp" | |
| 49 #include "runtime/fieldType.hpp" | |
| 50 #include "runtime/handles.inline.hpp" | |
| 51 #include "runtime/java.hpp" | |
| 52 #include "runtime/javaCalls.hpp" | |
| 53 #include "runtime/mutexLocker.hpp" | |
| 54 #include "runtime/signature.hpp" | |
| 55 #include "services/classLoadingService.hpp" | |
| 56 #include "services/threadService.hpp" | |
| 0 | 57 |
| 58 | |
| 1903 | 59 Dictionary* SystemDictionary::_dictionary = NULL; |
| 60 PlaceholderTable* SystemDictionary::_placeholders = NULL; | |
| 61 Dictionary* SystemDictionary::_shared_dictionary = NULL; | |
| 62 LoaderConstraintTable* SystemDictionary::_loader_constraints = NULL; | |
| 63 ResolutionErrorTable* SystemDictionary::_resolution_errors = NULL; | |
| 64 SymbolPropertyTable* SystemDictionary::_invoke_method_table = NULL; | |
| 0 | 65 |
| 66 | |
| 67 int SystemDictionary::_number_of_modifications = 0; | |
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68 int SystemDictionary::_sdgeneration = 0; |
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69 const int SystemDictionary::_primelist[_prime_array_size] = {1009,2017,4049,5051,10103, |
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70 20201,40423,99991}; |
| 0 | 71 |
| 72 oop SystemDictionary::_system_loader_lock_obj = NULL; | |
| 73 | |
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74 klassOop SystemDictionary::_well_known_klasses[SystemDictionary::WKID_LIMIT] |
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75 = { NULL /*, NULL...*/ }; |
| 0 | 76 |
| 77 klassOop SystemDictionary::_box_klasses[T_VOID+1] = { NULL /*, NULL...*/ }; | |
| 78 | |
| 79 oop SystemDictionary::_java_system_loader = NULL; | |
| 80 | |
| 81 bool SystemDictionary::_has_loadClassInternal = false; | |
| 82 bool SystemDictionary::_has_checkPackageAccess = false; | |
| 83 | |
| 84 // lazily initialized klass variables | |
| 85 volatile klassOop SystemDictionary::_abstract_ownable_synchronizer_klass = NULL; | |
| 86 | |
| 87 | |
| 88 // ---------------------------------------------------------------------------- | |
| 89 // Java-level SystemLoader | |
| 90 | |
| 91 oop SystemDictionary::java_system_loader() { | |
| 92 return _java_system_loader; | |
| 93 } | |
| 94 | |
| 95 void SystemDictionary::compute_java_system_loader(TRAPS) { | |
| 1142 | 96 KlassHandle system_klass(THREAD, WK_KLASS(ClassLoader_klass)); |
| 0 | 97 JavaValue result(T_OBJECT); |
| 98 JavaCalls::call_static(&result, | |
| 1142 | 99 KlassHandle(THREAD, WK_KLASS(ClassLoader_klass)), |
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100 vmSymbols::getSystemClassLoader_name(), |
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101 vmSymbols::void_classloader_signature(), |
| 0 | 102 CHECK); |
| 103 | |
| 104 _java_system_loader = (oop)result.get_jobject(); | |
| 105 } | |
| 106 | |
| 107 | |
| 108 // ---------------------------------------------------------------------------- | |
| 109 // debugging | |
| 110 | |
| 111 #ifdef ASSERT | |
| 112 | |
| 113 // return true if class_name contains no '.' (internal format is '/') | |
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114 bool SystemDictionary::is_internal_format(Symbol* class_name) { |
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115 if (class_name != NULL) { |
| 0 | 116 ResourceMark rm; |
| 117 char* name = class_name->as_C_string(); | |
| 118 return strchr(name, '.') == NULL; | |
| 119 } else { | |
| 120 return true; | |
| 121 } | |
| 122 } | |
| 123 | |
| 124 #endif | |
| 125 | |
| 126 // ---------------------------------------------------------------------------- | |
| 514 | 127 // Parallel class loading check |
| 128 | |
| 129 bool SystemDictionary::is_parallelCapable(Handle class_loader) { | |
| 130 if (UnsyncloadClass || class_loader.is_null()) return true; | |
| 131 if (AlwaysLockClassLoader) return false; | |
| 3938 | 132 return java_lang_ClassLoader::parallelCapable(class_loader()); |
| 514 | 133 } |
| 134 // ---------------------------------------------------------------------------- | |
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135 // ParallelDefineClass flag does not apply to bootclass loader |
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136 bool SystemDictionary::is_parallelDefine(Handle class_loader) { |
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137 if (class_loader.is_null()) return false; |
| 3938 | 138 if (AllowParallelDefineClass && java_lang_ClassLoader::parallelCapable(class_loader())) { |
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139 return true; |
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140 } |
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141 return false; |
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142 } |
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143 // ---------------------------------------------------------------------------- |
| 0 | 144 // Resolving of classes |
| 145 | |
| 146 // Forwards to resolve_or_null | |
| 147 | |
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148 klassOop SystemDictionary::resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS) { |
| 0 | 149 klassOop klass = resolve_or_null(class_name, class_loader, protection_domain, THREAD); |
| 150 if (HAS_PENDING_EXCEPTION || klass == NULL) { | |
| 151 KlassHandle k_h(THREAD, klass); | |
| 152 // can return a null klass | |
| 153 klass = handle_resolution_exception(class_name, class_loader, protection_domain, throw_error, k_h, THREAD); | |
| 154 } | |
| 155 return klass; | |
| 156 } | |
| 157 | |
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158 klassOop SystemDictionary::handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS) { |
| 0 | 159 if (HAS_PENDING_EXCEPTION) { |
| 160 // If we have a pending exception we forward it to the caller, unless throw_error is true, | |
| 161 // in which case we have to check whether the pending exception is a ClassNotFoundException, | |
| 162 // and if so convert it to a NoClassDefFoundError | |
| 163 // And chain the original ClassNotFoundException | |
| 1142 | 164 if (throw_error && PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass())) { |
| 0 | 165 ResourceMark rm(THREAD); |
| 166 assert(klass_h() == NULL, "Should not have result with exception pending"); | |
| 167 Handle e(THREAD, PENDING_EXCEPTION); | |
| 168 CLEAR_PENDING_EXCEPTION; | |
| 169 THROW_MSG_CAUSE_0(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string(), e); | |
| 170 } else { | |
| 171 return NULL; | |
| 172 } | |
| 173 } | |
| 174 // Class not found, throw appropriate error or exception depending on value of throw_error | |
| 175 if (klass_h() == NULL) { | |
| 176 ResourceMark rm(THREAD); | |
| 177 if (throw_error) { | |
| 178 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string()); | |
| 179 } else { | |
| 180 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), class_name->as_C_string()); | |
| 181 } | |
| 182 } | |
| 183 return (klassOop)klass_h(); | |
| 184 } | |
| 185 | |
| 186 | |
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187 klassOop SystemDictionary::resolve_or_fail(Symbol* class_name, |
| 0 | 188 bool throw_error, TRAPS) |
| 189 { | |
| 190 return resolve_or_fail(class_name, Handle(), Handle(), throw_error, THREAD); | |
| 191 } | |
| 192 | |
| 193 | |
| 194 // Forwards to resolve_instance_class_or_null | |
| 195 | |
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196 klassOop SystemDictionary::resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS) { |
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197 assert(!THREAD->is_Compiler_thread(), |
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198 err_msg("can not load classes with compiler thread: class=%s, classloader=%s", |
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199 class_name->as_C_string(), |
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200 class_loader.is_null() ? "null" : class_loader->klass()->klass_part()->name()->as_C_string())); |
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201 if (FieldType::is_array(class_name)) { |
| 0 | 202 return resolve_array_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); |
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203 } else if (FieldType::is_obj(class_name)) { |
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204 ResourceMark rm(THREAD); |
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205 // Ignore wrapping L and ;. |
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206 TempNewSymbol name = SymbolTable::new_symbol(class_name->as_C_string() + 1, |
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207 class_name->utf8_length() - 2, CHECK_NULL); |
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208 return resolve_instance_class_or_null(name, class_loader, protection_domain, CHECK_NULL); |
| 0 | 209 } else { |
| 210 return resolve_instance_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); | |
| 211 } | |
| 212 } | |
| 213 | |
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214 klassOop SystemDictionary::resolve_or_null(Symbol* class_name, TRAPS) { |
| 0 | 215 return resolve_or_null(class_name, Handle(), Handle(), THREAD); |
| 216 } | |
| 217 | |
| 218 // Forwards to resolve_instance_class_or_null | |
| 219 | |
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220 klassOop SystemDictionary::resolve_array_class_or_null(Symbol* class_name, |
| 0 | 221 Handle class_loader, |
| 222 Handle protection_domain, | |
| 223 TRAPS) { | |
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224 assert(FieldType::is_array(class_name), "must be array"); |
| 0 | 225 klassOop k = NULL; |
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226 FieldArrayInfo fd; |
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227 // dimension and object_key in FieldArrayInfo are assigned as a side-effect |
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228 // of this call |
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229 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_NULL); |
| 0 | 230 if (t == T_OBJECT) { |
| 231 // naked oop "k" is OK here -- we assign back into it | |
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232 k = SystemDictionary::resolve_instance_class_or_null(fd.object_key(), |
| 0 | 233 class_loader, |
| 234 protection_domain, | |
| 235 CHECK_NULL); | |
| 236 if (k != NULL) { | |
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237 k = Klass::cast(k)->array_klass(fd.dimension(), CHECK_NULL); |
| 0 | 238 } |
| 239 } else { | |
| 240 k = Universe::typeArrayKlassObj(t); | |
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241 k = typeArrayKlass::cast(k)->array_klass(fd.dimension(), CHECK_NULL); |
| 0 | 242 } |
| 243 return k; | |
| 244 } | |
| 245 | |
| 246 | |
| 247 // Must be called for any super-class or super-interface resolution | |
| 248 // during class definition to allow class circularity checking | |
| 249 // super-interface callers: | |
| 250 // parse_interfaces - for defineClass & jvmtiRedefineClasses | |
| 251 // super-class callers: | |
| 252 // ClassFileParser - for defineClass & jvmtiRedefineClasses | |
| 253 // load_shared_class - while loading a class from shared archive | |
| 514 | 254 // resolve_instance_class_or_null: |
| 255 // via: handle_parallel_super_load | |
| 0 | 256 // when resolving a class that has an existing placeholder with |
| 257 // a saved superclass [i.e. a defineClass is currently in progress] | |
| 258 // if another thread is trying to resolve the class, it must do | |
| 259 // super-class checks on its own thread to catch class circularity | |
| 260 // This last call is critical in class circularity checking for cases | |
| 261 // where classloading is delegated to different threads and the | |
| 262 // classloader lock is released. | |
| 263 // Take the case: Base->Super->Base | |
| 264 // 1. If thread T1 tries to do a defineClass of class Base | |
| 265 // resolve_super_or_fail creates placeholder: T1, Base (super Super) | |
| 266 // 2. resolve_instance_class_or_null does not find SD or placeholder for Super | |
| 267 // so it tries to load Super | |
| 268 // 3. If we load the class internally, or user classloader uses same thread | |
| 269 // loadClassFromxxx or defineClass via parseClassFile Super ... | |
| 270 // 3.1 resolve_super_or_fail creates placeholder: T1, Super (super Base) | |
| 271 // 3.3 resolve_instance_class_or_null Base, finds placeholder for Base | |
| 272 // 3.4 calls resolve_super_or_fail Base | |
| 273 // 3.5 finds T1,Base -> throws class circularity | |
| 274 //OR 4. If T2 tries to resolve Super via defineClass Super ... | |
| 275 // 4.1 resolve_super_or_fail creates placeholder: T2, Super (super Base) | |
| 276 // 4.2 resolve_instance_class_or_null Base, finds placeholder for Base (super Super) | |
| 277 // 4.3 calls resolve_super_or_fail Super in parallel on own thread T2 | |
| 278 // 4.4 finds T2, Super -> throws class circularity | |
| 279 // Must be called, even if superclass is null, since this is | |
| 280 // where the placeholder entry is created which claims this | |
| 281 // thread is loading this class/classloader. | |
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282 klassOop SystemDictionary::resolve_super_or_fail(Symbol* child_name, |
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283 Symbol* class_name, |
| 0 | 284 Handle class_loader, |
| 285 Handle protection_domain, | |
| 286 bool is_superclass, | |
| 287 TRAPS) { | |
| 288 | |
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289 // Try to get one of the well-known klasses. |
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290 // They are trusted, and do not participate in circularities. |
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291 if (LinkWellKnownClasses) { |
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292 klassOop k = find_well_known_klass(class_name); |
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293 if (k != NULL) { |
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294 return k; |
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295 } |
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296 } |
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297 |
| 0 | 298 // Double-check, if child class is already loaded, just return super-class,interface |
| 299 // Don't add a placedholder if already loaded, i.e. already in system dictionary | |
| 300 // Make sure there's a placeholder for the *child* before resolving. | |
| 301 // Used as a claim that this thread is currently loading superclass/classloader | |
| 302 // Used here for ClassCircularity checks and also for heap verification | |
| 303 // (every instanceKlass in the heap needs to be in the system dictionary | |
| 304 // or have a placeholder). | |
| 305 // Must check ClassCircularity before checking if super class is already loaded | |
| 306 // | |
| 307 // We might not already have a placeholder if this child_name was | |
| 308 // first seen via resolve_from_stream (jni_DefineClass or JVM_DefineClass); | |
| 309 // the name of the class might not be known until the stream is actually | |
| 310 // parsed. | |
| 311 // Bugs 4643874, 4715493 | |
| 312 // compute_hash can have a safepoint | |
| 313 | |
| 314 unsigned int d_hash = dictionary()->compute_hash(child_name, class_loader); | |
| 315 int d_index = dictionary()->hash_to_index(d_hash); | |
| 316 unsigned int p_hash = placeholders()->compute_hash(child_name, class_loader); | |
| 317 int p_index = placeholders()->hash_to_index(p_hash); | |
| 318 // can't throw error holding a lock | |
| 319 bool child_already_loaded = false; | |
| 320 bool throw_circularity_error = false; | |
| 321 { | |
| 322 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 323 klassOop childk = find_class(d_index, d_hash, child_name, class_loader); | |
| 324 klassOop quicksuperk; | |
| 325 // to support // loading: if child done loading, just return superclass | |
| 326 // if class_name, & class_loader don't match: | |
| 327 // if initial define, SD update will give LinkageError | |
| 328 // if redefine: compare_class_versions will give HIERARCHY_CHANGED | |
| 329 // so we don't throw an exception here. | |
| 330 // see: nsk redefclass014 & java.lang.instrument Instrument032 | |
| 331 if ((childk != NULL ) && (is_superclass) && | |
| 332 ((quicksuperk = instanceKlass::cast(childk)->super()) != NULL) && | |
| 333 | |
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334 ((Klass::cast(quicksuperk)->name() == class_name) && |
| 0 | 335 (Klass::cast(quicksuperk)->class_loader() == class_loader()))) { |
| 336 return quicksuperk; | |
| 337 } else { | |
| 338 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, class_loader); | |
| 339 if (probe && probe->check_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER)) { | |
| 340 throw_circularity_error = true; | |
| 341 } | |
| 514 | 342 } |
| 343 if (!throw_circularity_error) { | |
| 0 | 344 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, child_name, class_loader, PlaceholderTable::LOAD_SUPER, class_name, THREAD); |
| 345 } | |
| 346 } | |
| 347 if (throw_circularity_error) { | |
| 348 ResourceMark rm(THREAD); | |
| 349 THROW_MSG_0(vmSymbols::java_lang_ClassCircularityError(), child_name->as_C_string()); | |
| 350 } | |
| 351 | |
| 352 // java.lang.Object should have been found above | |
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353 assert(class_name != NULL, "null super class for resolving"); |
| 0 | 354 // Resolve the super class or interface, check results on return |
| 355 klassOop superk = NULL; | |
| 356 superk = SystemDictionary::resolve_or_null(class_name, | |
| 357 class_loader, | |
| 358 protection_domain, | |
| 359 THREAD); | |
| 360 | |
| 361 KlassHandle superk_h(THREAD, superk); | |
| 362 | |
| 363 // Note: clean up of placeholders currently in callers of | |
| 364 // resolve_super_or_fail - either at update_dictionary time | |
| 365 // or on error | |
| 366 { | |
| 367 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 368 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, class_loader); | |
| 369 if (probe != NULL) { | |
| 370 probe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER); | |
| 371 } | |
| 372 } | |
| 373 if (HAS_PENDING_EXCEPTION || superk_h() == NULL) { | |
| 374 // can null superk | |
| 375 superk_h = KlassHandle(THREAD, handle_resolution_exception(class_name, class_loader, protection_domain, true, superk_h, THREAD)); | |
| 376 } | |
| 377 | |
| 378 return superk_h(); | |
| 379 } | |
| 380 | |
| 381 void SystemDictionary::validate_protection_domain(instanceKlassHandle klass, | |
| 382 Handle class_loader, | |
| 383 Handle protection_domain, | |
| 384 TRAPS) { | |
| 385 if(!has_checkPackageAccess()) return; | |
| 386 | |
| 387 // Now we have to call back to java to check if the initating class has access | |
| 388 JavaValue result(T_VOID); | |
| 389 if (TraceProtectionDomainVerification) { | |
| 390 // Print out trace information | |
| 391 tty->print_cr("Checking package access"); | |
| 392 tty->print(" - class loader: "); class_loader()->print_value_on(tty); tty->cr(); | |
| 393 tty->print(" - protection domain: "); protection_domain()->print_value_on(tty); tty->cr(); | |
| 394 tty->print(" - loading: "); klass()->print_value_on(tty); tty->cr(); | |
| 395 } | |
| 396 | |
| 397 assert(class_loader() != NULL, "should not have non-null protection domain for null classloader"); | |
| 398 | |
| 1142 | 399 KlassHandle system_loader(THREAD, SystemDictionary::ClassLoader_klass()); |
| 0 | 400 JavaCalls::call_special(&result, |
| 401 class_loader, | |
| 402 system_loader, | |
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403 vmSymbols::checkPackageAccess_name(), |
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404 vmSymbols::class_protectiondomain_signature(), |
| 0 | 405 Handle(THREAD, klass->java_mirror()), |
| 406 protection_domain, | |
| 407 THREAD); | |
| 408 | |
| 409 if (TraceProtectionDomainVerification) { | |
| 410 if (HAS_PENDING_EXCEPTION) { | |
| 411 tty->print_cr(" -> DENIED !!!!!!!!!!!!!!!!!!!!!"); | |
| 412 } else { | |
| 413 tty->print_cr(" -> granted"); | |
| 414 } | |
| 415 tty->cr(); | |
| 416 } | |
| 417 | |
| 418 if (HAS_PENDING_EXCEPTION) return; | |
| 419 | |
| 420 // If no exception has been thrown, we have validated the protection domain | |
| 421 // Insert the protection domain of the initiating class into the set. | |
| 422 { | |
| 423 // We recalculate the entry here -- we've called out to java since | |
| 424 // the last time it was calculated. | |
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425 Symbol* kn = klass->name(); |
| 0 | 426 unsigned int d_hash = dictionary()->compute_hash(kn, class_loader); |
| 427 int d_index = dictionary()->hash_to_index(d_hash); | |
| 428 | |
| 429 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 430 { | |
| 431 // Note that we have an entry, and entries can be deleted only during GC, | |
| 432 // so we cannot allow GC to occur while we're holding this entry. | |
| 433 | |
| 434 // We're using a No_Safepoint_Verifier to catch any place where we | |
| 435 // might potentially do a GC at all. | |
| 436 // SystemDictionary::do_unloading() asserts that classes are only | |
| 437 // unloaded at a safepoint. | |
| 438 No_Safepoint_Verifier nosafepoint; | |
| 439 dictionary()->add_protection_domain(d_index, d_hash, klass, class_loader, | |
| 440 protection_domain, THREAD); | |
| 441 } | |
| 442 } | |
| 443 } | |
| 444 | |
| 445 // We only get here if this thread finds that another thread | |
| 446 // has already claimed the placeholder token for the current operation, | |
| 447 // but that other thread either never owned or gave up the | |
| 448 // object lock | |
| 449 // Waits on SystemDictionary_lock to indicate placeholder table updated | |
| 450 // On return, caller must recheck placeholder table state | |
| 451 // | |
| 452 // We only get here if | |
| 453 // 1) custom classLoader, i.e. not bootstrap classloader | |
| 454 // 2) UnsyncloadClass not set | |
| 455 // 3) custom classLoader has broken the class loader objectLock | |
| 456 // so another thread got here in parallel | |
| 457 // | |
| 458 // lockObject must be held. | |
| 459 // Complicated dance due to lock ordering: | |
| 460 // Must first release the classloader object lock to | |
| 461 // allow initial definer to complete the class definition | |
| 462 // and to avoid deadlock | |
| 463 // Reclaim classloader lock object with same original recursion count | |
| 464 // Must release SystemDictionary_lock after notify, since | |
| 465 // class loader lock must be claimed before SystemDictionary_lock | |
| 466 // to prevent deadlocks | |
| 467 // | |
| 468 // The notify allows applications that did an untimed wait() on | |
| 469 // the classloader object lock to not hang. | |
| 470 void SystemDictionary::double_lock_wait(Handle lockObject, TRAPS) { | |
| 471 assert_lock_strong(SystemDictionary_lock); | |
| 472 | |
| 473 bool calledholdinglock | |
| 474 = ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, lockObject); | |
| 475 assert(calledholdinglock,"must hold lock for notify"); | |
| 514 | 476 assert((!(lockObject() == _system_loader_lock_obj) && !is_parallelCapable(lockObject)), "unexpected double_lock_wait"); |
| 0 | 477 ObjectSynchronizer::notifyall(lockObject, THREAD); |
| 478 intptr_t recursions = ObjectSynchronizer::complete_exit(lockObject, THREAD); | |
| 479 SystemDictionary_lock->wait(); | |
| 480 SystemDictionary_lock->unlock(); | |
| 481 ObjectSynchronizer::reenter(lockObject, recursions, THREAD); | |
| 482 SystemDictionary_lock->lock(); | |
| 483 } | |
| 484 | |
| 485 // If the class in is in the placeholder table, class loading is in progress | |
| 486 // For cases where the application changes threads to load classes, it | |
| 487 // is critical to ClassCircularity detection that we try loading | |
| 488 // the superclass on the same thread internally, so we do parallel | |
| 489 // super class loading here. | |
| 490 // This also is critical in cases where the original thread gets stalled | |
| 491 // even in non-circularity situations. | |
| 492 // Note: only one thread can define the class, but multiple can resolve | |
| 493 // Note: must call resolve_super_or_fail even if null super - | |
| 514 | 494 // to force placeholder entry creation for this class for circularity detection |
| 0 | 495 // Caller must check for pending exception |
| 496 // Returns non-null klassOop if other thread has completed load | |
| 497 // and we are done, | |
| 498 // If return null klassOop and no pending exception, the caller must load the class | |
| 499 instanceKlassHandle SystemDictionary::handle_parallel_super_load( | |
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500 Symbol* name, Symbol* superclassname, Handle class_loader, |
| 0 | 501 Handle protection_domain, Handle lockObject, TRAPS) { |
| 502 | |
| 503 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
| 504 unsigned int d_hash = dictionary()->compute_hash(name, class_loader); | |
| 505 int d_index = dictionary()->hash_to_index(d_hash); | |
| 506 unsigned int p_hash = placeholders()->compute_hash(name, class_loader); | |
| 507 int p_index = placeholders()->hash_to_index(p_hash); | |
| 508 | |
| 509 // superk is not used, resolve_super called for circularity check only | |
| 510 // This code is reached in two situations. One if this thread | |
| 511 // is loading the same class twice (e.g. ClassCircularity, or | |
| 512 // java.lang.instrument). | |
| 513 // The second is if another thread started the resolve_super first | |
| 514 // and has not yet finished. | |
| 515 // In both cases the original caller will clean up the placeholder | |
| 516 // entry on error. | |
| 517 klassOop superk = SystemDictionary::resolve_super_or_fail(name, | |
| 518 superclassname, | |
| 519 class_loader, | |
| 520 protection_domain, | |
| 521 true, | |
| 522 CHECK_(nh)); | |
| 523 // We don't redefine the class, so we just need to clean up if there | |
| 524 // was not an error (don't want to modify any system dictionary | |
| 525 // data structures). | |
| 526 { | |
| 527 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 528 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
| 529 SystemDictionary_lock->notify_all(); | |
| 530 } | |
| 531 | |
| 514 | 532 // parallelCapable class loaders do NOT wait for parallel superclass loads to complete |
| 533 // Serial class loaders and bootstrap classloader do wait for superclass loads | |
| 534 if (!class_loader.is_null() && is_parallelCapable(class_loader)) { | |
| 0 | 535 MutexLocker mu(SystemDictionary_lock, THREAD); |
| 536 // Check if classloading completed while we were loading superclass or waiting | |
| 537 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 538 if (check != NULL) { | |
| 539 // Klass is already loaded, so just return it | |
| 540 return(instanceKlassHandle(THREAD, check)); | |
| 541 } else { | |
| 542 return nh; | |
| 543 } | |
| 544 } | |
| 545 | |
| 546 // must loop to both handle other placeholder updates | |
| 547 // and spurious notifications | |
| 548 bool super_load_in_progress = true; | |
| 549 PlaceholderEntry* placeholder; | |
| 550 while (super_load_in_progress) { | |
| 551 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 552 // Check if classloading completed while we were loading superclass or waiting | |
| 553 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 554 if (check != NULL) { | |
| 555 // Klass is already loaded, so just return it | |
| 556 return(instanceKlassHandle(THREAD, check)); | |
| 557 } else { | |
| 558 placeholder = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
| 559 if (placeholder && placeholder->super_load_in_progress() ){ | |
| 560 // Before UnsyncloadClass: | |
| 561 // We only get here if the application has released the | |
| 562 // classloader lock when another thread was in the middle of loading a | |
| 563 // superclass/superinterface for this class, and now | |
| 564 // this thread is also trying to load this class. | |
| 565 // To minimize surprises, the first thread that started to | |
| 566 // load a class should be the one to complete the loading | |
| 567 // with the classfile it initially expected. | |
| 568 // This logic has the current thread wait once it has done | |
| 569 // all the superclass/superinterface loading it can, until | |
| 570 // the original thread completes the class loading or fails | |
| 571 // If it completes we will use the resulting instanceKlass | |
| 572 // which we will find below in the systemDictionary. | |
| 573 // We also get here for parallel bootstrap classloader | |
| 574 if (class_loader.is_null()) { | |
| 575 SystemDictionary_lock->wait(); | |
| 576 } else { | |
| 577 double_lock_wait(lockObject, THREAD); | |
| 578 } | |
| 579 } else { | |
| 580 // If not in SD and not in PH, other thread's load must have failed | |
| 581 super_load_in_progress = false; | |
| 582 } | |
| 583 } | |
| 584 } | |
| 585 return (nh); | |
| 586 } | |
| 587 | |
| 588 | |
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589 klassOop SystemDictionary::resolve_instance_class_or_null(Symbol* name, Handle class_loader, Handle protection_domain, TRAPS) { |
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590 assert(name != NULL && !FieldType::is_array(name) && |
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591 !FieldType::is_obj(name), "invalid class name"); |
| 0 | 592 |
| 593 // UseNewReflection | |
| 594 // Fix for 4474172; see evaluation for more details | |
| 595 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); | |
| 596 | |
| 597 // Do lookup to see if class already exist and the protection domain | |
| 598 // has the right access | |
| 599 unsigned int d_hash = dictionary()->compute_hash(name, class_loader); | |
| 600 int d_index = dictionary()->hash_to_index(d_hash); | |
| 601 klassOop probe = dictionary()->find(d_index, d_hash, name, class_loader, | |
| 602 protection_domain, THREAD); | |
| 603 if (probe != NULL) return probe; | |
| 604 | |
| 605 | |
| 606 // Non-bootstrap class loaders will call out to class loader and | |
| 607 // define via jvm/jni_DefineClass which will acquire the | |
| 608 // class loader object lock to protect against multiple threads | |
| 609 // defining the class in parallel by accident. | |
| 610 // This lock must be acquired here so the waiter will find | |
| 611 // any successful result in the SystemDictionary and not attempt | |
| 612 // the define | |
| 514 | 613 // ParallelCapable Classloaders and the bootstrap classloader, |
| 0 | 614 // or all classloaders with UnsyncloadClass do not acquire lock here |
| 615 bool DoObjectLock = true; | |
| 514 | 616 if (is_parallelCapable(class_loader)) { |
| 0 | 617 DoObjectLock = false; |
| 618 } | |
| 619 | |
| 620 unsigned int p_hash = placeholders()->compute_hash(name, class_loader); | |
| 621 int p_index = placeholders()->hash_to_index(p_hash); | |
| 622 | |
| 623 // Class is not in SystemDictionary so we have to do loading. | |
| 624 // Make sure we are synchronized on the class loader before we proceed | |
| 625 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
| 626 check_loader_lock_contention(lockObject, THREAD); | |
| 627 ObjectLocker ol(lockObject, THREAD, DoObjectLock); | |
| 628 | |
| 629 // Check again (after locking) if class already exist in SystemDictionary | |
| 630 bool class_has_been_loaded = false; | |
| 631 bool super_load_in_progress = false; | |
| 632 bool havesupername = false; | |
| 633 instanceKlassHandle k; | |
| 634 PlaceholderEntry* placeholder; | |
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635 Symbol* superclassname = NULL; |
| 0 | 636 |
| 637 { | |
| 638 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 639 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 640 if (check != NULL) { | |
| 641 // Klass is already loaded, so just return it | |
| 642 class_has_been_loaded = true; | |
| 643 k = instanceKlassHandle(THREAD, check); | |
| 644 } else { | |
| 645 placeholder = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
| 646 if (placeholder && placeholder->super_load_in_progress()) { | |
| 647 super_load_in_progress = true; | |
| 648 if (placeholder->havesupername() == true) { | |
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649 superclassname = placeholder->supername(); |
| 0 | 650 havesupername = true; |
| 651 } | |
| 652 } | |
| 653 } | |
| 654 } | |
| 655 | |
| 656 // If the class in is in the placeholder table, class loading is in progress | |
| 657 if (super_load_in_progress && havesupername==true) { | |
| 658 k = SystemDictionary::handle_parallel_super_load(name, superclassname, | |
| 659 class_loader, protection_domain, lockObject, THREAD); | |
| 660 if (HAS_PENDING_EXCEPTION) { | |
| 661 return NULL; | |
| 662 } | |
| 663 if (!k.is_null()) { | |
| 664 class_has_been_loaded = true; | |
| 665 } | |
| 666 } | |
| 667 | |
| 668 if (!class_has_been_loaded) { | |
| 669 | |
| 670 // add placeholder entry to record loading instance class | |
| 671 // Five cases: | |
| 672 // All cases need to prevent modifying bootclasssearchpath | |
| 673 // in parallel with a classload of same classname | |
| 514 | 674 // Redefineclasses uses existence of the placeholder for the duration |
| 675 // of the class load to prevent concurrent redefinition of not completely | |
| 676 // defined classes. | |
| 0 | 677 // case 1. traditional classloaders that rely on the classloader object lock |
| 678 // - no other need for LOAD_INSTANCE | |
| 679 // case 2. traditional classloaders that break the classloader object lock | |
| 680 // as a deadlock workaround. Detection of this case requires that | |
| 681 // this check is done while holding the classloader object lock, | |
| 682 // and that lock is still held when calling classloader's loadClass. | |
| 683 // For these classloaders, we ensure that the first requestor | |
| 684 // completes the load and other requestors wait for completion. | |
| 685 // case 3. UnsyncloadClass - don't use objectLocker | |
| 686 // With this flag, we allow parallel classloading of a | |
| 687 // class/classloader pair | |
| 688 // case4. Bootstrap classloader - don't own objectLocker | |
| 689 // This classloader supports parallelism at the classloader level, | |
| 690 // but only allows a single load of a class/classloader pair. | |
| 691 // No performance benefit and no deadlock issues. | |
| 514 | 692 // case 5. parallelCapable user level classloaders - without objectLocker |
| 693 // Allow parallel classloading of a class/classloader pair | |
| 0 | 694 bool throw_circularity_error = false; |
| 695 { | |
| 696 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 514 | 697 if (class_loader.is_null() || !is_parallelCapable(class_loader)) { |
| 0 | 698 PlaceholderEntry* oldprobe = placeholders()->get_entry(p_index, p_hash, name, class_loader); |
| 699 if (oldprobe) { | |
| 700 // only need check_seen_thread once, not on each loop | |
| 701 // 6341374 java/lang/Instrument with -Xcomp | |
| 702 if (oldprobe->check_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE)) { | |
| 703 throw_circularity_error = true; | |
| 704 } else { | |
| 705 // case 1: traditional: should never see load_in_progress. | |
| 706 while (!class_has_been_loaded && oldprobe && oldprobe->instance_load_in_progress()) { | |
| 707 | |
| 708 // case 4: bootstrap classloader: prevent futile classloading, | |
| 709 // wait on first requestor | |
| 710 if (class_loader.is_null()) { | |
| 711 SystemDictionary_lock->wait(); | |
| 712 } else { | |
| 713 // case 2: traditional with broken classloader lock. wait on first | |
| 714 // requestor. | |
| 715 double_lock_wait(lockObject, THREAD); | |
| 716 } | |
| 717 // Check if classloading completed while we were waiting | |
| 718 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 719 if (check != NULL) { | |
| 720 // Klass is already loaded, so just return it | |
| 721 k = instanceKlassHandle(THREAD, check); | |
| 722 class_has_been_loaded = true; | |
| 723 } | |
| 724 // check if other thread failed to load and cleaned up | |
| 725 oldprobe = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
| 726 } | |
| 727 } | |
| 728 } | |
| 729 } | |
| 730 // All cases: add LOAD_INSTANCE | |
| 514 | 731 // case 3: UnsyncloadClass || case 5: parallelCapable: allow competing threads to try |
| 0 | 732 // LOAD_INSTANCE in parallel |
| 733 // add placeholder entry even if error - callers will remove on error | |
| 514 | 734 if (!throw_circularity_error && !class_has_been_loaded) { |
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735 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, name, class_loader, PlaceholderTable::LOAD_INSTANCE, NULL, THREAD); |
| 0 | 736 // For class loaders that do not acquire the classloader object lock, |
| 737 // if they did not catch another thread holding LOAD_INSTANCE, | |
| 738 // need a check analogous to the acquire ObjectLocker/find_class | |
| 739 // i.e. now that we hold the LOAD_INSTANCE token on loading this class/CL | |
| 740 // one final check if the load has already completed | |
| 514 | 741 // class loaders holding the ObjectLock shouldn't find the class here |
| 0 | 742 klassOop check = find_class(d_index, d_hash, name, class_loader); |
| 743 if (check != NULL) { | |
| 744 // Klass is already loaded, so just return it | |
| 745 k = instanceKlassHandle(THREAD, check); | |
| 746 class_has_been_loaded = true; | |
| 747 newprobe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE); | |
| 514 | 748 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); |
| 749 SystemDictionary_lock->notify_all(); | |
| 0 | 750 } |
| 751 } | |
| 752 } | |
| 753 // must throw error outside of owning lock | |
| 754 if (throw_circularity_error) { | |
| 755 ResourceMark rm(THREAD); | |
| 756 THROW_MSG_0(vmSymbols::java_lang_ClassCircularityError(), name->as_C_string()); | |
| 757 } | |
| 758 | |
| 759 if (!class_has_been_loaded) { | |
| 760 | |
| 761 // Do actual loading | |
| 762 k = load_instance_class(name, class_loader, THREAD); | |
| 763 | |
|
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764 // For UnsyncloadClass only |
| 0 | 765 // If they got a linkageError, check if a parallel class load succeeded. |
| 766 // If it did, then for bytecode resolution the specification requires | |
| 767 // that we return the same result we did for the other thread, i.e. the | |
| 768 // successfully loaded instanceKlass | |
| 769 // Should not get here for classloaders that support parallelism | |
|
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770 // with the new cleaner mechanism, even with AllowParallelDefineClass |
| 514 | 771 // Bootstrap goes through here to allow for an extra guarantee check |
| 0 | 772 if (UnsyncloadClass || (class_loader.is_null())) { |
| 773 if (k.is_null() && HAS_PENDING_EXCEPTION | |
| 1142 | 774 && PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { |
| 0 | 775 MutexLocker mu(SystemDictionary_lock, THREAD); |
| 776 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 777 if (check != NULL) { | |
| 778 // Klass is already loaded, so just use it | |
| 779 k = instanceKlassHandle(THREAD, check); | |
| 780 CLEAR_PENDING_EXCEPTION; | |
| 781 guarantee((!class_loader.is_null()), "dup definition for bootstrap loader?"); | |
| 782 } | |
| 783 } | |
| 784 } | |
| 785 | |
| 786 // clean up placeholder entries for success or error | |
| 787 // This cleans up LOAD_INSTANCE entries | |
| 788 // It also cleans up LOAD_SUPER entries on errors from | |
| 789 // calling load_instance_class | |
| 790 { | |
| 791 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 792 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
| 793 if (probe != NULL) { | |
| 794 probe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE); | |
| 795 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
| 796 SystemDictionary_lock->notify_all(); | |
| 797 } | |
| 798 } | |
| 799 | |
| 800 // If everything was OK (no exceptions, no null return value), and | |
| 801 // class_loader is NOT the defining loader, do a little more bookkeeping. | |
| 802 if (!HAS_PENDING_EXCEPTION && !k.is_null() && | |
| 803 k->class_loader() != class_loader()) { | |
| 804 | |
| 805 check_constraints(d_index, d_hash, k, class_loader, false, THREAD); | |
| 806 | |
| 807 // Need to check for a PENDING_EXCEPTION again; check_constraints | |
| 808 // can throw and doesn't use the CHECK macro. | |
| 809 if (!HAS_PENDING_EXCEPTION) { | |
| 810 { // Grabbing the Compile_lock prevents systemDictionary updates | |
| 811 // during compilations. | |
| 812 MutexLocker mu(Compile_lock, THREAD); | |
| 813 update_dictionary(d_index, d_hash, p_index, p_hash, | |
| 814 k, class_loader, THREAD); | |
| 815 } | |
| 816 if (JvmtiExport::should_post_class_load()) { | |
| 817 Thread *thread = THREAD; | |
| 818 assert(thread->is_Java_thread(), "thread->is_Java_thread()"); | |
| 819 JvmtiExport::post_class_load((JavaThread *) thread, k()); | |
| 820 } | |
| 821 } | |
| 822 } | |
| 823 if (HAS_PENDING_EXCEPTION || k.is_null()) { | |
| 824 // On error, clean up placeholders | |
| 825 { | |
| 826 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 827 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
| 828 SystemDictionary_lock->notify_all(); | |
| 829 } | |
| 830 return NULL; | |
| 831 } | |
| 832 } | |
| 833 } | |
| 834 | |
| 835 #ifdef ASSERT | |
| 836 { | |
| 837 Handle loader (THREAD, k->class_loader()); | |
| 838 MutexLocker mu(SystemDictionary_lock, THREAD); | |
|
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839 oop kk = find_class(name, loader); |
| 0 | 840 assert(kk == k(), "should be present in dictionary"); |
| 841 } | |
| 842 #endif | |
| 843 | |
| 844 // return if the protection domain in NULL | |
| 845 if (protection_domain() == NULL) return k(); | |
| 846 | |
| 847 // Check the protection domain has the right access | |
| 848 { | |
| 849 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 850 // Note that we have an entry, and entries can be deleted only during GC, | |
| 851 // so we cannot allow GC to occur while we're holding this entry. | |
| 852 // We're using a No_Safepoint_Verifier to catch any place where we | |
| 853 // might potentially do a GC at all. | |
| 854 // SystemDictionary::do_unloading() asserts that classes are only | |
| 855 // unloaded at a safepoint. | |
| 856 No_Safepoint_Verifier nosafepoint; | |
| 857 if (dictionary()->is_valid_protection_domain(d_index, d_hash, name, | |
| 858 class_loader, | |
| 859 protection_domain)) { | |
| 860 return k(); | |
| 861 } | |
| 862 } | |
| 863 | |
| 864 // Verify protection domain. If it fails an exception is thrown | |
| 865 validate_protection_domain(k, class_loader, protection_domain, CHECK_(klassOop(NULL))); | |
| 866 | |
| 867 return k(); | |
| 868 } | |
| 869 | |
| 870 | |
| 871 // This routine does not lock the system dictionary. | |
| 872 // | |
| 873 // Since readers don't hold a lock, we must make sure that system | |
| 874 // dictionary entries are only removed at a safepoint (when only one | |
| 875 // thread is running), and are added to in a safe way (all links must | |
| 876 // be updated in an MT-safe manner). | |
| 877 // | |
| 878 // Callers should be aware that an entry could be added just after | |
| 879 // _dictionary->bucket(index) is read here, so the caller will not see | |
| 880 // the new entry. | |
| 881 | |
|
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882 klassOop SystemDictionary::find(Symbol* class_name, |
| 0 | 883 Handle class_loader, |
| 884 Handle protection_domain, | |
| 885 TRAPS) { | |
| 886 | |
|
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887 // UseNewReflection |
|
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888 // The result of this call should be consistent with the result |
|
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|
889 // of the call to resolve_instance_class_or_null(). |
|
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890 // See evaluation 6790209 and 4474172 for more details. |
|
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891 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); |
|
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|
892 |
| 0 | 893 unsigned int d_hash = dictionary()->compute_hash(class_name, class_loader); |
| 894 int d_index = dictionary()->hash_to_index(d_hash); | |
| 895 | |
| 896 { | |
| 897 // Note that we have an entry, and entries can be deleted only during GC, | |
| 898 // so we cannot allow GC to occur while we're holding this entry. | |
| 899 // We're using a No_Safepoint_Verifier to catch any place where we | |
| 900 // might potentially do a GC at all. | |
| 901 // SystemDictionary::do_unloading() asserts that classes are only | |
| 902 // unloaded at a safepoint. | |
| 903 No_Safepoint_Verifier nosafepoint; | |
| 904 return dictionary()->find(d_index, d_hash, class_name, class_loader, | |
| 905 protection_domain, THREAD); | |
| 906 } | |
| 907 } | |
| 908 | |
| 909 | |
| 910 // Look for a loaded instance or array klass by name. Do not do any loading. | |
| 911 // return NULL in case of error. | |
|
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912 klassOop SystemDictionary::find_instance_or_array_klass(Symbol* class_name, |
| 0 | 913 Handle class_loader, |
| 914 Handle protection_domain, | |
| 915 TRAPS) { | |
| 916 klassOop k = NULL; | |
|
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917 assert(class_name != NULL, "class name must be non NULL"); |
|
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918 |
|
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919 // Try to get one of the well-known klasses. |
|
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920 if (LinkWellKnownClasses) { |
|
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921 k = find_well_known_klass(class_name); |
|
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922 if (k != NULL) { |
|
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923 return k; |
|
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|
924 } |
|
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925 } |
|
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926 |
|
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927 if (FieldType::is_array(class_name)) { |
| 0 | 928 // The name refers to an array. Parse the name. |
|
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929 // dimension and object_key in FieldArrayInfo are assigned as a |
|
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930 // side-effect of this call |
|
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931 FieldArrayInfo fd; |
|
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|
932 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
| 0 | 933 if (t != T_OBJECT) { |
| 934 k = Universe::typeArrayKlassObj(t); | |
| 935 } else { | |
|
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936 k = SystemDictionary::find(fd.object_key(), class_loader, protection_domain, THREAD); |
| 0 | 937 } |
| 938 if (k != NULL) { | |
|
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939 k = Klass::cast(k)->array_klass_or_null(fd.dimension()); |
| 0 | 940 } |
| 941 } else { | |
| 942 k = find(class_name, class_loader, protection_domain, THREAD); | |
| 943 } | |
| 944 return k; | |
| 945 } | |
| 946 | |
|
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947 // Quick range check for names of well-known classes: |
|
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948 static Symbol* wk_klass_name_limits[2] = {NULL, NULL}; |
|
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949 |
|
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950 #ifndef PRODUCT |
|
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951 static int find_wkk_calls, find_wkk_probes, find_wkk_wins; |
|
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952 // counts for "hello world": 3983, 1616, 1075 |
|
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953 // => 60% hit after limit guard, 25% total win rate |
|
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954 #endif |
|
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955 |
|
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956 klassOop SystemDictionary::find_well_known_klass(Symbol* class_name) { |
|
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957 // A bounds-check on class_name will quickly get a negative result. |
|
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958 NOT_PRODUCT(find_wkk_calls++); |
|
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959 if (class_name >= wk_klass_name_limits[0] && |
|
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960 class_name <= wk_klass_name_limits[1]) { |
|
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961 NOT_PRODUCT(find_wkk_probes++); |
|
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962 vmSymbols::SID sid = vmSymbols::find_sid(class_name); |
|
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963 if (sid != vmSymbols::NO_SID) { |
|
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|
964 klassOop k = NULL; |
|
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965 switch (sid) { |
|
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966 #define WK_KLASS_CASE(name, symbol, ignore_option) \ |
|
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967 case vmSymbols::VM_SYMBOL_ENUM_NAME(symbol): \ |
|
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|
968 k = WK_KLASS(name); break; |
|
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969 WK_KLASSES_DO(WK_KLASS_CASE) |
|
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970 #undef WK_KLASS_CASE |
|
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971 } |
|
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972 NOT_PRODUCT(if (k != NULL) find_wkk_wins++); |
|
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|
973 return k; |
|
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|
974 } |
|
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|
975 } |
|
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|
976 return NULL; |
|
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|
977 } |
|
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|
978 |
| 0 | 979 // Note: this method is much like resolve_from_stream, but |
| 980 // updates no supplemental data structures. | |
| 981 // TODO consolidate the two methods with a helper routine? | |
|
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982 klassOop SystemDictionary::parse_stream(Symbol* class_name, |
| 0 | 983 Handle class_loader, |
| 984 Handle protection_domain, | |
| 985 ClassFileStream* st, | |
|
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986 KlassHandle host_klass, |
|
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987 GrowableArray<Handle>* cp_patches, |
| 0 | 988 TRAPS) { |
|
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|
989 TempNewSymbol parsed_name = NULL; |
| 0 | 990 |
| 991 // Parse the stream. Note that we do this even though this klass might | |
| 992 // already be present in the SystemDictionary, otherwise we would not | |
| 993 // throw potential ClassFormatErrors. | |
| 994 // | |
| 995 // Note: "name" is updated. | |
| 996 // Further note: a placeholder will be added for this class when | |
| 997 // super classes are loaded (resolve_super_or_fail). We expect this | |
| 998 // to be called for all classes but java.lang.Object; and we preload | |
| 999 // java.lang.Object through resolve_or_fail, not this path. | |
| 1000 | |
| 1001 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
| 1002 class_loader, | |
| 1003 protection_domain, | |
| 710 | 1004 host_klass, |
| 1005 cp_patches, | |
| 0 | 1006 parsed_name, |
|
973
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|
1007 true, |
| 0 | 1008 THREAD); |
| 1009 | |
| 1010 // We don't redefine the class, so we just need to clean up whether there | |
| 1011 // was an error or not (don't want to modify any system dictionary | |
| 1012 // data structures). | |
| 1013 // Parsed name could be null if we threw an error before we got far | |
| 1014 // enough along to parse it -- in that case, there is nothing to clean up. | |
|
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1015 if (parsed_name != NULL) { |
| 0 | 1016 unsigned int p_hash = placeholders()->compute_hash(parsed_name, |
| 1017 class_loader); | |
| 1018 int p_index = placeholders()->hash_to_index(p_hash); | |
| 1019 { | |
| 1020 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 1021 placeholders()->find_and_remove(p_index, p_hash, parsed_name, class_loader, THREAD); | |
| 1022 SystemDictionary_lock->notify_all(); | |
| 1023 } | |
| 1024 } | |
| 1025 | |
|
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1026 if (host_klass.not_null() && k.not_null()) { |
|
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|
1027 assert(EnableInvokeDynamic, ""); |
|
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1028 // If it's anonymous, initialize it now, since nobody else will. |
|
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1029 k->set_host_klass(host_klass()); |
|
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1030 |
|
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1031 { |
|
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1032 MutexLocker mu_r(Compile_lock, THREAD); |
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1033 |
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1034 // Add to class hierarchy, initialize vtables, and do possible |
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1035 // deoptimizations. |
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1036 add_to_hierarchy(k, CHECK_NULL); // No exception, but can block |
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1037 |
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1038 // But, do not add to system dictionary. |
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1039 } |
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1040 |
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1041 k->eager_initialize(THREAD); |
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1042 |
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1043 // notify jvmti |
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1044 if (JvmtiExport::should_post_class_load()) { |
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1045 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); |
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1046 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); |
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1047 } |
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1048 } |
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1049 |
| 0 | 1050 return k(); |
| 1051 } | |
| 1052 | |
| 1053 // Add a klass to the system from a stream (called by jni_DefineClass and | |
| 1054 // JVM_DefineClass). | |
| 1055 // Note: class_name can be NULL. In that case we do not know the name of | |
| 1056 // the class until we have parsed the stream. | |
| 1057 | |
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1058 klassOop SystemDictionary::resolve_from_stream(Symbol* class_name, |
| 0 | 1059 Handle class_loader, |
| 1060 Handle protection_domain, | |
| 1061 ClassFileStream* st, | |
|
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1062 bool verify, |
| 0 | 1063 TRAPS) { |
| 1064 | |
| 514 | 1065 // Classloaders that support parallelism, e.g. bootstrap classloader, |
| 1066 // or all classloaders with UnsyncloadClass do not acquire lock here | |
| 1067 bool DoObjectLock = true; | |
| 1068 if (is_parallelCapable(class_loader)) { | |
| 1069 DoObjectLock = false; | |
| 1070 } | |
| 1071 | |
| 1072 // Make sure we are synchronized on the class loader before we proceed | |
| 0 | 1073 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); |
| 1074 check_loader_lock_contention(lockObject, THREAD); | |
| 514 | 1075 ObjectLocker ol(lockObject, THREAD, DoObjectLock); |
| 0 | 1076 |
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1077 TempNewSymbol parsed_name = NULL; |
| 0 | 1078 |
| 1079 // Parse the stream. Note that we do this even though this klass might | |
| 1080 // already be present in the SystemDictionary, otherwise we would not | |
| 1081 // throw potential ClassFormatErrors. | |
| 1082 // | |
| 1083 // Note: "name" is updated. | |
| 1084 // Further note: a placeholder will be added for this class when | |
| 1085 // super classes are loaded (resolve_super_or_fail). We expect this | |
| 1086 // to be called for all classes but java.lang.Object; and we preload | |
| 1087 // java.lang.Object through resolve_or_fail, not this path. | |
| 1088 | |
| 1089 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
| 1090 class_loader, | |
| 1091 protection_domain, | |
| 1092 parsed_name, | |
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1093 verify, |
| 0 | 1094 THREAD); |
| 1095 | |
| 1096 const char* pkg = "java/"; | |
| 1097 if (!HAS_PENDING_EXCEPTION && | |
| 1098 !class_loader.is_null() && | |
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1099 parsed_name != NULL && |
| 0 | 1100 !strncmp((const char*)parsed_name->bytes(), pkg, strlen(pkg))) { |
| 1101 // It is illegal to define classes in the "java." package from | |
| 1102 // JVM_DefineClass or jni_DefineClass unless you're the bootclassloader | |
| 1103 ResourceMark rm(THREAD); | |
| 1104 char* name = parsed_name->as_C_string(); | |
| 1105 char* index = strrchr(name, '/'); | |
| 1106 *index = '\0'; // chop to just the package name | |
| 1107 while ((index = strchr(name, '/')) != NULL) { | |
| 1108 *index = '.'; // replace '/' with '.' in package name | |
| 1109 } | |
| 1110 const char* fmt = "Prohibited package name: %s"; | |
| 1111 size_t len = strlen(fmt) + strlen(name); | |
| 1112 char* message = NEW_RESOURCE_ARRAY(char, len); | |
| 1113 jio_snprintf(message, len, fmt, name); | |
| 1114 Exceptions::_throw_msg(THREAD_AND_LOCATION, | |
| 1115 vmSymbols::java_lang_SecurityException(), message); | |
| 1116 } | |
| 1117 | |
| 1118 if (!HAS_PENDING_EXCEPTION) { | |
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1119 assert(parsed_name != NULL, "Sanity"); |
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1120 assert(class_name == NULL || class_name == parsed_name, "name mismatch"); |
| 0 | 1121 // Verification prevents us from creating names with dots in them, this |
| 1122 // asserts that that's the case. | |
| 1123 assert(is_internal_format(parsed_name), | |
| 1124 "external class name format used internally"); | |
| 1125 | |
| 1126 // Add class just loaded | |
| 514 | 1127 // If a class loader supports parallel classloading handle parallel define requests |
| 1128 // find_or_define_instance_class may return a different instanceKlass | |
| 1129 if (is_parallelCapable(class_loader)) { | |
| 1130 k = find_or_define_instance_class(class_name, class_loader, k, THREAD); | |
| 1131 } else { | |
| 1132 define_instance_class(k, THREAD); | |
| 1133 } | |
| 0 | 1134 } |
| 1135 | |
| 1136 // If parsing the class file or define_instance_class failed, we | |
| 1137 // need to remove the placeholder added on our behalf. But we | |
| 1138 // must make sure parsed_name is valid first (it won't be if we had | |
| 1139 // a format error before the class was parsed far enough to | |
| 1140 // find the name). | |
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1141 if (HAS_PENDING_EXCEPTION && parsed_name != NULL) { |
| 0 | 1142 unsigned int p_hash = placeholders()->compute_hash(parsed_name, |
| 1143 class_loader); | |
| 1144 int p_index = placeholders()->hash_to_index(p_hash); | |
| 1145 { | |
| 1146 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 1147 placeholders()->find_and_remove(p_index, p_hash, parsed_name, class_loader, THREAD); | |
| 1148 SystemDictionary_lock->notify_all(); | |
| 1149 } | |
| 1150 return NULL; | |
| 1151 } | |
| 1152 | |
| 1153 // Make sure that we didn't leave a place holder in the | |
| 1154 // SystemDictionary; this is only done on success | |
| 1155 debug_only( { | |
| 1156 if (!HAS_PENDING_EXCEPTION) { | |
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1157 assert(parsed_name != NULL, "parsed_name is still null?"); |
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1158 Symbol* h_name = k->name(); |
| 0 | 1159 Handle h_loader (THREAD, k->class_loader()); |
| 1160 | |
| 1161 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 1162 | |
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1163 klassOop check = find_class(parsed_name, class_loader); |
| 0 | 1164 assert(check == k(), "should be present in the dictionary"); |
| 1165 | |
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1166 klassOop check2 = find_class(h_name, h_loader); |
| 0 | 1167 assert(check == check2, "name inconsistancy in SystemDictionary"); |
| 1168 } | |
| 1169 } ); | |
| 1170 | |
| 1171 return k(); | |
| 1172 } | |
| 1173 | |
| 1174 | |
| 6197 | 1175 void SystemDictionary::set_shared_dictionary(HashtableBucket<mtClass>* t, int length, |
| 0 | 1176 int number_of_entries) { |
| 6197 | 1177 assert(length == _nof_buckets * sizeof(HashtableBucket<mtClass>), |
| 0 | 1178 "bad shared dictionary size."); |
| 1179 _shared_dictionary = new Dictionary(_nof_buckets, t, number_of_entries); | |
| 1180 } | |
| 1181 | |
| 1182 | |
| 1183 // If there is a shared dictionary, then find the entry for the | |
| 1184 // given shared system class, if any. | |
| 1185 | |
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1186 klassOop SystemDictionary::find_shared_class(Symbol* class_name) { |
| 0 | 1187 if (shared_dictionary() != NULL) { |
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1188 unsigned int d_hash = shared_dictionary()->compute_hash(class_name, Handle()); |
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1189 int d_index = shared_dictionary()->hash_to_index(d_hash); |
| 0 | 1190 return shared_dictionary()->find_shared_class(d_index, d_hash, class_name); |
| 1191 } else { | |
| 1192 return NULL; | |
| 1193 } | |
| 1194 } | |
| 1195 | |
| 1196 | |
| 1197 // Load a class from the shared spaces (found through the shared system | |
| 1198 // dictionary). Force the superclass and all interfaces to be loaded. | |
| 1199 // Update the class definition to include sibling classes and no | |
| 1200 // subclasses (yet). [Classes in the shared space are not part of the | |
| 1201 // object hierarchy until loaded.] | |
| 1202 | |
| 1203 instanceKlassHandle SystemDictionary::load_shared_class( | |
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1204 Symbol* class_name, Handle class_loader, TRAPS) { |
| 0 | 1205 instanceKlassHandle ik (THREAD, find_shared_class(class_name)); |
| 1206 return load_shared_class(ik, class_loader, THREAD); | |
| 1207 } | |
| 1208 | |
| 1209 // Note well! Changes to this method may affect oop access order | |
| 1210 // in the shared archive. Please take care to not make changes that | |
| 1211 // adversely affect cold start time by changing the oop access order | |
| 1212 // that is specified in dump.cpp MarkAndMoveOrderedReadOnly and | |
| 1213 // MarkAndMoveOrderedReadWrite closures. | |
| 1214 instanceKlassHandle SystemDictionary::load_shared_class( | |
| 1215 instanceKlassHandle ik, Handle class_loader, TRAPS) { | |
| 1216 assert(class_loader.is_null(), "non-null classloader for shared class?"); | |
| 1217 if (ik.not_null()) { | |
| 1218 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1219 Symbol* class_name = ik->name(); |
| 0 | 1220 |
| 1221 // Found the class, now load the superclass and interfaces. If they | |
| 1222 // are shared, add them to the main system dictionary and reset | |
| 1223 // their hierarchy references (supers, subs, and interfaces). | |
| 1224 | |
| 1225 if (ik->super() != NULL) { | |
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1226 Symbol* cn = ik->super()->klass_part()->name(); |
| 0 | 1227 resolve_super_or_fail(class_name, cn, |
| 1228 class_loader, Handle(), true, CHECK_(nh)); | |
| 1229 } | |
| 1230 | |
| 1231 objArrayHandle interfaces (THREAD, ik->local_interfaces()); | |
| 1232 int num_interfaces = interfaces->length(); | |
| 1233 for (int index = 0; index < num_interfaces; index++) { | |
| 1234 klassOop k = klassOop(interfaces->obj_at(index)); | |
| 1235 | |
| 1236 // Note: can not use instanceKlass::cast here because | |
| 1237 // interfaces' instanceKlass's C++ vtbls haven't been | |
| 1238 // reinitialized yet (they will be once the interface classes | |
| 1239 // are loaded) | |
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1240 Symbol* name = k->klass_part()->name(); |
| 0 | 1241 resolve_super_or_fail(class_name, name, class_loader, Handle(), false, CHECK_(nh)); |
| 1242 } | |
| 1243 | |
| 1244 // Adjust methods to recover missing data. They need addresses for | |
| 1245 // interpreter entry points and their default native method address | |
| 1246 // must be reset. | |
| 1247 | |
| 1248 // Updating methods must be done under a lock so multiple | |
| 1249 // threads don't update these in parallel | |
| 1250 // Shared classes are all currently loaded by the bootstrap | |
| 1251 // classloader, so this will never cause a deadlock on | |
| 1252 // a custom class loader lock. | |
| 1253 | |
| 1254 { | |
| 1255 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
| 1256 check_loader_lock_contention(lockObject, THREAD); | |
| 1257 ObjectLocker ol(lockObject, THREAD, true); | |
| 1258 | |
| 1259 objArrayHandle methods (THREAD, ik->methods()); | |
| 1260 int num_methods = methods->length(); | |
| 1261 for (int index2 = 0; index2 < num_methods; ++index2) { | |
| 1262 methodHandle m(THREAD, methodOop(methods->obj_at(index2))); | |
| 1263 m()->link_method(m, CHECK_(nh)); | |
| 1264 } | |
|
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1265 if (JvmtiExport::has_redefined_a_class()) { |
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1266 // Reinitialize vtable because RedefineClasses may have changed some |
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1267 // entries in this vtable for super classes so the CDS vtable might |
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1268 // point to old or obsolete entries. RedefineClasses doesn't fix up |
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1269 // vtables in the shared system dictionary, only the main one. |
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1270 // It also redefines the itable too so fix that too. |
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1271 ResourceMark rm(THREAD); |
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1272 ik->vtable()->initialize_vtable(false, CHECK_(nh)); |
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1273 ik->itable()->initialize_itable(false, CHECK_(nh)); |
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1274 } |
| 0 | 1275 } |
| 1276 | |
| 1277 if (TraceClassLoading) { | |
| 1278 ResourceMark rm; | |
| 1279 tty->print("[Loaded %s", ik->external_name()); | |
| 1280 tty->print(" from shared objects file"); | |
| 1281 tty->print_cr("]"); | |
| 1282 } | |
| 1283 // notify a class loaded from shared object | |
| 1284 ClassLoadingService::notify_class_loaded(instanceKlass::cast(ik()), | |
| 1285 true /* shared class */); | |
| 1286 } | |
| 1287 return ik; | |
| 1288 } | |
| 1289 | |
| 1290 #ifdef KERNEL | |
| 1291 // Some classes on the bootstrap class path haven't been installed on the | |
| 1292 // system yet. Call the DownloadManager method to make them appear in the | |
| 1293 // bootstrap class path and try again to load the named class. | |
| 1294 // Note that with delegation class loaders all classes in another loader will | |
| 1295 // first try to call this so it'd better be fast!! | |
| 1296 static instanceKlassHandle download_and_retry_class_load( | |
|
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1297 Symbol* class_name, |
| 0 | 1298 TRAPS) { |
| 1299 | |
| 3938 | 1300 klassOop dlm = SystemDictionary::DownloadManager_klass(); |
| 0 | 1301 instanceKlassHandle nk; |
| 1302 | |
| 1303 // If download manager class isn't loaded just return. | |
| 1304 if (dlm == NULL) return nk; | |
| 1305 | |
| 1306 { HandleMark hm(THREAD); | |
| 1307 ResourceMark rm(THREAD); | |
| 1308 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nk)); | |
| 1309 Handle class_string = java_lang_String::externalize_classname(s, CHECK_(nk)); | |
| 1310 | |
| 1311 // return value | |
| 1312 JavaValue result(T_OBJECT); | |
| 1313 | |
| 1314 // Call the DownloadManager. We assume that it has a lock because | |
| 1315 // multiple classes could be not found and downloaded at the same time. | |
| 1316 // class sun.misc.DownloadManager; | |
| 1317 // public static String getBootClassPathEntryForClass(String className); | |
| 1318 JavaCalls::call_static(&result, | |
| 1319 KlassHandle(THREAD, dlm), | |
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1320 vmSymbols::getBootClassPathEntryForClass_name(), |
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1321 vmSymbols::string_string_signature(), |
| 0 | 1322 class_string, |
| 1323 CHECK_(nk)); | |
| 1324 | |
| 1325 // Get result.string and add to bootclasspath | |
| 1326 assert(result.get_type() == T_OBJECT, "just checking"); | |
| 1327 oop obj = (oop) result.get_jobject(); | |
| 1328 if (obj == NULL) { return nk; } | |
| 1329 | |
|
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1330 Handle h_obj(THREAD, obj); |
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1331 char* new_class_name = java_lang_String::as_platform_dependent_str(h_obj, |
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1332 CHECK_(nk)); |
| 0 | 1333 |
| 1334 // lock the loader | |
| 1335 // we use this lock because JVMTI does. | |
| 1336 Handle loader_lock(THREAD, SystemDictionary::system_loader_lock()); | |
| 1337 | |
| 1338 ObjectLocker ol(loader_lock, THREAD); | |
| 1339 // add the file to the bootclasspath | |
| 1340 ClassLoader::update_class_path_entry_list(new_class_name, true); | |
| 1341 } // end HandleMark | |
| 1342 | |
| 1343 if (TraceClassLoading) { | |
| 1344 ClassLoader::print_bootclasspath(); | |
| 1345 } | |
| 1346 return ClassLoader::load_classfile(class_name, CHECK_(nk)); | |
| 1347 } | |
| 1348 #endif // KERNEL | |
| 1349 | |
| 1350 | |
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1351 instanceKlassHandle SystemDictionary::load_instance_class(Symbol* class_name, Handle class_loader, TRAPS) { |
| 0 | 1352 instanceKlassHandle nh = instanceKlassHandle(); // null Handle |
| 1353 if (class_loader.is_null()) { | |
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1354 |
| 0 | 1355 // Search the shared system dictionary for classes preloaded into the |
| 1356 // shared spaces. | |
| 1357 instanceKlassHandle k; | |
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1358 { |
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1359 PerfTraceTime vmtimer(ClassLoader::perf_shared_classload_time()); |
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1360 k = load_shared_class(class_name, class_loader, THREAD); |
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1361 } |
| 0 | 1362 |
| 1363 if (k.is_null()) { | |
| 1364 // Use VM class loader | |
|
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1365 PerfTraceTime vmtimer(ClassLoader::perf_sys_classload_time()); |
| 0 | 1366 k = ClassLoader::load_classfile(class_name, CHECK_(nh)); |
| 1367 } | |
| 1368 | |
| 1369 #ifdef KERNEL | |
| 1370 // If the VM class loader has failed to load the class, call the | |
| 1371 // DownloadManager class to make it magically appear on the classpath | |
| 1372 // and try again. This is only configured with the Kernel VM. | |
| 1373 if (k.is_null()) { | |
| 1374 k = download_and_retry_class_load(class_name, CHECK_(nh)); | |
| 1375 } | |
| 1376 #endif // KERNEL | |
| 1377 | |
| 514 | 1378 // find_or_define_instance_class may return a different instanceKlass |
| 0 | 1379 if (!k.is_null()) { |
| 1380 k = find_or_define_instance_class(class_name, class_loader, k, CHECK_(nh)); | |
| 1381 } | |
| 1382 return k; | |
| 1383 } else { | |
| 1384 // Use user specified class loader to load class. Call loadClass operation on class_loader. | |
| 1385 ResourceMark rm(THREAD); | |
| 1386 | |
|
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1387 assert(THREAD->is_Java_thread(), "must be a JavaThread"); |
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1388 JavaThread* jt = (JavaThread*) THREAD; |
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1389 |
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1390 PerfClassTraceTime vmtimer(ClassLoader::perf_app_classload_time(), |
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1391 ClassLoader::perf_app_classload_selftime(), |
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1392 ClassLoader::perf_app_classload_count(), |
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1393 jt->get_thread_stat()->perf_recursion_counts_addr(), |
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1394 jt->get_thread_stat()->perf_timers_addr(), |
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1395 PerfClassTraceTime::CLASS_LOAD); |
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1396 |
| 0 | 1397 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nh)); |
| 1398 // Translate to external class name format, i.e., convert '/' chars to '.' | |
| 1399 Handle string = java_lang_String::externalize_classname(s, CHECK_(nh)); | |
| 1400 | |
| 1401 JavaValue result(T_OBJECT); | |
| 1402 | |
| 1142 | 1403 KlassHandle spec_klass (THREAD, SystemDictionary::ClassLoader_klass()); |
| 0 | 1404 |
| 514 | 1405 // Call public unsynchronized loadClass(String) directly for all class loaders |
| 1406 // for parallelCapable class loaders. JDK >=7, loadClass(String, boolean) will | |
| 1407 // acquire a class-name based lock rather than the class loader object lock. | |
| 1408 // JDK < 7 already acquire the class loader lock in loadClass(String, boolean), | |
| 1409 // so the call to loadClassInternal() was not required. | |
| 1410 // | |
| 1411 // UnsyncloadClass flag means both call loadClass(String) and do | |
| 1412 // not acquire the class loader lock even for class loaders that are | |
| 1413 // not parallelCapable. This was a risky transitional | |
| 1414 // flag for diagnostic purposes only. It is risky to call | |
| 0 | 1415 // custom class loaders without synchronization. |
| 1416 // WARNING If a custom class loader does NOT synchronizer findClass, or callers of | |
| 514 | 1417 // findClass, the UnsyncloadClass flag risks unexpected timing bugs in the field. |
| 0 | 1418 // Do NOT assume this will be supported in future releases. |
| 514 | 1419 // |
| 1420 // Added MustCallLoadClassInternal in case we discover in the field | |
| 1421 // a customer that counts on this call | |
| 1422 if (MustCallLoadClassInternal && has_loadClassInternal()) { | |
| 0 | 1423 JavaCalls::call_special(&result, |
| 1424 class_loader, | |
| 1425 spec_klass, | |
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1426 vmSymbols::loadClassInternal_name(), |
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1427 vmSymbols::string_class_signature(), |
| 0 | 1428 string, |
| 1429 CHECK_(nh)); | |
| 1430 } else { | |
| 1431 JavaCalls::call_virtual(&result, | |
| 1432 class_loader, | |
| 1433 spec_klass, | |
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1434 vmSymbols::loadClass_name(), |
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1435 vmSymbols::string_class_signature(), |
| 0 | 1436 string, |
| 1437 CHECK_(nh)); | |
| 1438 } | |
| 1439 | |
| 1440 assert(result.get_type() == T_OBJECT, "just checking"); | |
| 1441 oop obj = (oop) result.get_jobject(); | |
| 1442 | |
| 1443 // Primitive classes return null since forName() can not be | |
| 1444 // used to obtain any of the Class objects representing primitives or void | |
| 1445 if ((obj != NULL) && !(java_lang_Class::is_primitive(obj))) { | |
| 1446 instanceKlassHandle k = | |
| 1447 instanceKlassHandle(THREAD, java_lang_Class::as_klassOop(obj)); | |
| 1448 // For user defined Java class loaders, check that the name returned is | |
| 1449 // the same as that requested. This check is done for the bootstrap | |
| 1450 // loader when parsing the class file. | |
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1451 if (class_name == k->name()) { |
| 0 | 1452 return k; |
| 1453 } | |
| 1454 } | |
| 1455 // Class is not found or has the wrong name, return NULL | |
| 1456 return nh; | |
| 1457 } | |
| 1458 } | |
| 1459 | |
| 1460 void SystemDictionary::define_instance_class(instanceKlassHandle k, TRAPS) { | |
| 1461 | |
| 1462 Handle class_loader_h(THREAD, k->class_loader()); | |
| 1463 | |
| 514 | 1464 // for bootstrap and other parallel classloaders don't acquire lock, |
| 1465 // use placeholder token | |
| 1466 // If a parallelCapable class loader calls define_instance_class instead of | |
| 1467 // find_or_define_instance_class to get here, we have a timing | |
| 1468 // hole with systemDictionary updates and check_constraints | |
| 1469 if (!class_loader_h.is_null() && !is_parallelCapable(class_loader_h)) { | |
| 0 | 1470 assert(ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, |
| 1471 compute_loader_lock_object(class_loader_h, THREAD)), | |
| 1472 "define called without lock"); | |
| 1473 } | |
| 1474 | |
| 1475 // Check class-loading constraints. Throw exception if violation is detected. | |
| 1476 // Grabs and releases SystemDictionary_lock | |
| 1477 // The check_constraints/find_class call and update_dictionary sequence | |
| 1478 // must be "atomic" for a specific class/classloader pair so we never | |
| 1479 // define two different instanceKlasses for that class/classloader pair. | |
| 1480 // Existing classloaders will call define_instance_class with the | |
| 1481 // classloader lock held | |
| 1482 // Parallel classloaders will call find_or_define_instance_class | |
| 1483 // which will require a token to perform the define class | |
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1484 Symbol* name_h = k->name(); |
| 0 | 1485 unsigned int d_hash = dictionary()->compute_hash(name_h, class_loader_h); |
| 1486 int d_index = dictionary()->hash_to_index(d_hash); | |
| 1487 check_constraints(d_index, d_hash, k, class_loader_h, true, CHECK); | |
| 1488 | |
| 1489 // Register class just loaded with class loader (placed in Vector) | |
| 1490 // Note we do this before updating the dictionary, as this can | |
| 1491 // fail with an OutOfMemoryError (if it does, we will *not* put this | |
| 1492 // class in the dictionary and will not update the class hierarchy). | |
| 1493 if (k->class_loader() != NULL) { | |
| 1494 methodHandle m(THREAD, Universe::loader_addClass_method()); | |
| 1495 JavaValue result(T_VOID); | |
| 1496 JavaCallArguments args(class_loader_h); | |
| 1497 args.push_oop(Handle(THREAD, k->java_mirror())); | |
| 1498 JavaCalls::call(&result, m, &args, CHECK); | |
| 1499 } | |
| 1500 | |
| 1501 // Add the new class. We need recompile lock during update of CHA. | |
| 1502 { | |
| 1503 unsigned int p_hash = placeholders()->compute_hash(name_h, class_loader_h); | |
| 1504 int p_index = placeholders()->hash_to_index(p_hash); | |
| 1505 | |
| 1506 MutexLocker mu_r(Compile_lock, THREAD); | |
| 1507 | |
| 1508 // Add to class hierarchy, initialize vtables, and do possible | |
| 1509 // deoptimizations. | |
| 1510 add_to_hierarchy(k, CHECK); // No exception, but can block | |
| 1511 | |
| 1512 // Add to systemDictionary - so other classes can see it. | |
| 1513 // Grabs and releases SystemDictionary_lock | |
| 1514 update_dictionary(d_index, d_hash, p_index, p_hash, | |
| 1515 k, class_loader_h, THREAD); | |
| 1516 } | |
| 1517 k->eager_initialize(THREAD); | |
| 1518 | |
| 1519 // notify jvmti | |
| 1520 if (JvmtiExport::should_post_class_load()) { | |
| 1521 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); | |
| 1522 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); | |
| 1523 | |
| 1524 } | |
| 1525 } | |
| 1526 | |
| 1527 // Support parallel classloading | |
|
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1528 // All parallel class loaders, including bootstrap classloader |
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1529 // lock a placeholder entry for this class/class_loader pair |
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1530 // to allow parallel defines of different classes for this class loader |
| 514 | 1531 // With AllowParallelDefine flag==true, in case they do not synchronize around |
| 1532 // FindLoadedClass/DefineClass, calls, we check for parallel | |
| 0 | 1533 // loading for them, wait if a defineClass is in progress |
| 1534 // and return the initial requestor's results | |
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1535 // This flag does not apply to the bootstrap classloader. |
| 514 | 1536 // With AllowParallelDefine flag==false, call through to define_instance_class |
| 1537 // which will throw LinkageError: duplicate class definition. | |
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1538 // False is the requested default. |
| 0 | 1539 // For better performance, the class loaders should synchronize |
| 514 | 1540 // findClass(), i.e. FindLoadedClass/DefineClassIfAbsent or they |
| 0 | 1541 // potentially waste time reading and parsing the bytestream. |
| 1542 // Note: VM callers should ensure consistency of k/class_name,class_loader | |
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1543 instanceKlassHandle SystemDictionary::find_or_define_instance_class(Symbol* class_name, Handle class_loader, instanceKlassHandle k, TRAPS) { |
| 0 | 1544 |
| 1545 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1546 Symbol* name_h = k->name(); // passed in class_name may be null |
| 0 | 1547 |
| 515 | 1548 unsigned int d_hash = dictionary()->compute_hash(name_h, class_loader); |
| 0 | 1549 int d_index = dictionary()->hash_to_index(d_hash); |
| 1550 | |
| 1551 // Hold SD lock around find_class and placeholder creation for DEFINE_CLASS | |
| 515 | 1552 unsigned int p_hash = placeholders()->compute_hash(name_h, class_loader); |
| 0 | 1553 int p_index = placeholders()->hash_to_index(p_hash); |
| 1554 PlaceholderEntry* probe; | |
| 1555 | |
| 1556 { | |
| 1557 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 1558 // First check if class already defined | |
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1559 if (UnsyncloadClass || (is_parallelDefine(class_loader))) { |
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1560 klassOop check = find_class(d_index, d_hash, name_h, class_loader); |
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1561 if (check != NULL) { |
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1562 return(instanceKlassHandle(THREAD, check)); |
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1563 } |
| 0 | 1564 } |
| 1565 | |
| 1566 // Acquire define token for this class/classloader | |
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1567 probe = placeholders()->find_and_add(p_index, p_hash, name_h, class_loader, PlaceholderTable::DEFINE_CLASS, NULL, THREAD); |
| 514 | 1568 // Wait if another thread defining in parallel |
| 1569 // All threads wait - even those that will throw duplicate class: otherwise | |
| 1570 // caller is surprised by LinkageError: duplicate, but findLoadedClass fails | |
| 1571 // if other thread has not finished updating dictionary | |
| 1572 while (probe->definer() != NULL) { | |
| 1573 SystemDictionary_lock->wait(); | |
| 1574 } | |
| 1575 // Only special cases allow parallel defines and can use other thread's results | |
| 1576 // Other cases fall through, and may run into duplicate defines | |
| 1577 // caught by finding an entry in the SystemDictionary | |
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1578 if ((UnsyncloadClass || is_parallelDefine(class_loader)) && (probe->instanceKlass() != NULL)) { |
| 0 | 1579 probe->remove_seen_thread(THREAD, PlaceholderTable::DEFINE_CLASS); |
| 515 | 1580 placeholders()->find_and_remove(p_index, p_hash, name_h, class_loader, THREAD); |
| 514 | 1581 SystemDictionary_lock->notify_all(); |
| 0 | 1582 #ifdef ASSERT |
| 515 | 1583 klassOop check = find_class(d_index, d_hash, name_h, class_loader); |
| 514 | 1584 assert(check != NULL, "definer missed recording success"); |
| 0 | 1585 #endif |
| 514 | 1586 return(instanceKlassHandle(THREAD, probe->instanceKlass())); |
| 0 | 1587 } else { |
| 514 | 1588 // This thread will define the class (even if earlier thread tried and had an error) |
| 1589 probe->set_definer(THREAD); | |
| 0 | 1590 } |
| 1591 } | |
| 1592 | |
| 1593 define_instance_class(k, THREAD); | |
| 1594 | |
| 1595 Handle linkage_exception = Handle(); // null handle | |
| 1596 | |
| 1597 // definer must notify any waiting threads | |
| 1598 { | |
| 1599 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 515 | 1600 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name_h, class_loader); |
| 0 | 1601 assert(probe != NULL, "DEFINE_CLASS placeholder lost?"); |
| 1602 if (probe != NULL) { | |
| 1603 if (HAS_PENDING_EXCEPTION) { | |
| 1604 linkage_exception = Handle(THREAD,PENDING_EXCEPTION); | |
| 1605 CLEAR_PENDING_EXCEPTION; | |
| 1606 } else { | |
| 1607 probe->set_instanceKlass(k()); | |
| 1608 } | |
| 1609 probe->set_definer(NULL); | |
| 1610 probe->remove_seen_thread(THREAD, PlaceholderTable::DEFINE_CLASS); | |
| 515 | 1611 placeholders()->find_and_remove(p_index, p_hash, name_h, class_loader, THREAD); |
| 0 | 1612 SystemDictionary_lock->notify_all(); |
| 1613 } | |
| 1614 } | |
| 1615 | |
| 1616 // Can't throw exception while holding lock due to rank ordering | |
| 1617 if (linkage_exception() != NULL) { | |
| 1618 THROW_OOP_(linkage_exception(), nh); // throws exception and returns | |
| 1619 } | |
| 1620 | |
| 1621 return k; | |
| 1622 } | |
| 1623 Handle SystemDictionary::compute_loader_lock_object(Handle class_loader, TRAPS) { | |
| 1624 // If class_loader is NULL we synchronize on _system_loader_lock_obj | |
| 1625 if (class_loader.is_null()) { | |
| 1626 return Handle(THREAD, _system_loader_lock_obj); | |
| 1627 } else { | |
| 1628 return class_loader; | |
| 1629 } | |
| 1630 } | |
| 1631 | |
| 1632 // This method is added to check how often we have to wait to grab loader | |
| 1633 // lock. The results are being recorded in the performance counters defined in | |
| 1634 // ClassLoader::_sync_systemLoaderLockContentionRate and | |
| 1635 // ClassLoader::_sync_nonSystemLoaderLockConteionRate. | |
| 1636 void SystemDictionary::check_loader_lock_contention(Handle loader_lock, TRAPS) { | |
| 1637 if (!UsePerfData) { | |
| 1638 return; | |
| 1639 } | |
| 1640 | |
| 1641 assert(!loader_lock.is_null(), "NULL lock object"); | |
| 1642 | |
| 1643 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader_lock) | |
| 1644 == ObjectSynchronizer::owner_other) { | |
| 1645 // contention will likely happen, so increment the corresponding | |
| 1646 // contention counter. | |
| 1647 if (loader_lock() == _system_loader_lock_obj) { | |
| 1648 ClassLoader::sync_systemLoaderLockContentionRate()->inc(); | |
| 1649 } else { | |
| 1650 ClassLoader::sync_nonSystemLoaderLockContentionRate()->inc(); | |
| 1651 } | |
| 1652 } | |
| 1653 } | |
| 1654 | |
| 1655 // ---------------------------------------------------------------------------- | |
| 1656 // Lookup | |
| 1657 | |
| 1658 klassOop SystemDictionary::find_class(int index, unsigned int hash, | |
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1659 Symbol* class_name, |
| 0 | 1660 Handle class_loader) { |
| 1661 assert_locked_or_safepoint(SystemDictionary_lock); | |
| 1662 assert (index == dictionary()->index_for(class_name, class_loader), | |
| 1663 "incorrect index?"); | |
| 1664 | |
| 1665 klassOop k = dictionary()->find_class(index, hash, class_name, class_loader); | |
| 1666 return k; | |
| 1667 } | |
| 1668 | |
| 1669 | |
| 1670 // Basic find on classes in the midst of being loaded | |
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1671 Symbol* SystemDictionary::find_placeholder(Symbol* class_name, |
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1672 Handle class_loader) { |
| 0 | 1673 assert_locked_or_safepoint(SystemDictionary_lock); |
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1674 unsigned int p_hash = placeholders()->compute_hash(class_name, class_loader); |
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1675 int p_index = placeholders()->hash_to_index(p_hash); |
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1676 return placeholders()->find_entry(p_index, p_hash, class_name, class_loader); |
| 0 | 1677 } |
| 1678 | |
| 1679 | |
| 1680 // Used for assertions and verification only | |
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1681 klassOop SystemDictionary::find_class(Symbol* class_name, Handle class_loader) { |
| 0 | 1682 #ifndef ASSERT |
| 1683 guarantee(VerifyBeforeGC || | |
| 1684 VerifyDuringGC || | |
| 1685 VerifyBeforeExit || | |
| 1686 VerifyAfterGC, "too expensive"); | |
| 1687 #endif | |
| 1688 assert_locked_or_safepoint(SystemDictionary_lock); | |
| 1689 | |
| 1690 // First look in the loaded class array | |
| 1691 unsigned int d_hash = dictionary()->compute_hash(class_name, class_loader); | |
| 1692 int d_index = dictionary()->hash_to_index(d_hash); | |
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1693 return find_class(d_index, d_hash, class_name, class_loader); |
| 0 | 1694 } |
| 1695 | |
| 1696 | |
| 1697 // Get the next class in the diictionary. | |
| 1698 klassOop SystemDictionary::try_get_next_class() { | |
| 1699 return dictionary()->try_get_next_class(); | |
| 1700 } | |
| 1701 | |
| 1702 | |
| 1703 // ---------------------------------------------------------------------------- | |
| 1704 // Update hierachy. This is done before the new klass has been added to the SystemDictionary. The Recompile_lock | |
| 1705 // is held, to ensure that the compiler is not using the class hierachy, and that deoptimization will kick in | |
| 1706 // before a new class is used. | |
| 1707 | |
| 1708 void SystemDictionary::add_to_hierarchy(instanceKlassHandle k, TRAPS) { | |
| 1709 assert(k.not_null(), "just checking"); | |
|
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1710 assert_locked_or_safepoint(Compile_lock); |
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1711 |
| 0 | 1712 // Link into hierachy. Make sure the vtables are initialized before linking into |
| 1713 k->append_to_sibling_list(); // add to superklass/sibling list | |
| 1714 k->process_interfaces(THREAD); // handle all "implements" declarations | |
| 1715 k->set_init_state(instanceKlass::loaded); | |
| 1716 // Now flush all code that depended on old class hierarchy. | |
| 1717 // Note: must be done *after* linking k into the hierarchy (was bug 12/9/97) | |
| 1718 // Also, first reinitialize vtable because it may have gotten out of synch | |
| 1719 // while the new class wasn't connected to the class hierarchy. | |
| 1720 Universe::flush_dependents_on(k); | |
| 1721 } | |
| 1722 | |
| 1723 | |
| 1724 // ---------------------------------------------------------------------------- | |
| 1725 // GC support | |
| 1726 | |
| 1727 // Following roots during mark-sweep is separated in two phases. | |
| 1728 // | |
| 1729 // The first phase follows preloaded classes and all other system | |
| 1730 // classes, since these will never get unloaded anyway. | |
| 1731 // | |
| 1732 // The second phase removes (unloads) unreachable classes from the | |
| 1733 // system dictionary and follows the remaining classes' contents. | |
| 1734 | |
| 1735 void SystemDictionary::always_strong_oops_do(OopClosure* blk) { | |
| 1736 // Follow preloaded classes/mirrors and system loader object | |
| 1737 blk->do_oop(&_java_system_loader); | |
| 1738 preloaded_oops_do(blk); | |
| 1739 always_strong_classes_do(blk); | |
| 1740 } | |
| 1741 | |
| 1742 | |
| 1743 void SystemDictionary::always_strong_classes_do(OopClosure* blk) { | |
| 1744 // Follow all system classes and temporary placeholders in dictionary | |
| 1745 dictionary()->always_strong_classes_do(blk); | |
| 1746 | |
| 1747 // Placeholders. These are *always* strong roots, as they | |
| 1748 // represent classes we're actively loading. | |
| 1749 placeholders_do(blk); | |
| 1750 | |
| 710 | 1751 // Visit extra methods |
| 1903 | 1752 invoke_method_table()->oops_do(blk); |
| 0 | 1753 } |
| 1754 | |
| 1755 | |
| 1756 void SystemDictionary::placeholders_do(OopClosure* blk) { | |
| 1757 placeholders()->oops_do(blk); | |
| 1758 } | |
| 1759 | |
|
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1760 // Calculate a "good" systemdictionary size based |
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1761 // on predicted or current loaded classes count |
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1762 int SystemDictionary::calculate_systemdictionary_size(int classcount) { |
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1763 int newsize = _old_default_sdsize; |
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1764 if ((classcount > 0) && !DumpSharedSpaces) { |
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1765 int desiredsize = classcount/_average_depth_goal; |
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1766 for (newsize = _primelist[_sdgeneration]; _sdgeneration < _prime_array_size -1; |
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1767 newsize = _primelist[++_sdgeneration]) { |
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1768 if (desiredsize <= newsize) { |
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1769 break; |
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1770 } |
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1771 } |
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1772 } |
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1773 return newsize; |
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1774 } |
| 0 | 1775 bool SystemDictionary::do_unloading(BoolObjectClosure* is_alive) { |
| 1776 bool result = dictionary()->do_unloading(is_alive); | |
| 1777 constraints()->purge_loader_constraints(is_alive); | |
| 1778 resolution_errors()->purge_resolution_errors(is_alive); | |
| 1779 return result; | |
| 1780 } | |
| 1781 | |
| 1782 | |
| 1783 // The mirrors are scanned by shared_oops_do() which is | |
| 1784 // not called by oops_do(). In order to process oops in | |
| 1785 // a necessary order, shared_oops_do() is call by | |
| 1786 // Universe::oops_do(). | |
| 1787 void SystemDictionary::oops_do(OopClosure* f) { | |
| 1788 // Adjust preloaded classes and system loader object | |
| 1789 f->do_oop(&_java_system_loader); | |
| 1790 preloaded_oops_do(f); | |
| 1791 | |
| 1792 lazily_loaded_oops_do(f); | |
| 1793 | |
| 1794 // Adjust dictionary | |
| 1795 dictionary()->oops_do(f); | |
| 1796 | |
| 710 | 1797 // Visit extra methods |
| 1903 | 1798 invoke_method_table()->oops_do(f); |
| 710 | 1799 |
| 0 | 1800 // Partially loaded classes |
| 1801 placeholders()->oops_do(f); | |
| 1802 | |
| 1803 // Adjust constraint table | |
| 1804 constraints()->oops_do(f); | |
| 1805 | |
| 1806 // Adjust resolution error table | |
| 1807 resolution_errors()->oops_do(f); | |
| 1808 } | |
| 1809 | |
| 1810 | |
| 1811 void SystemDictionary::preloaded_oops_do(OopClosure* f) { | |
|
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1812 for (int k = (int)FIRST_WKID; k < (int)WKID_LIMIT; k++) { |
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1813 f->do_oop((oop*) &_well_known_klasses[k]); |
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1814 } |
| 0 | 1815 |
| 1816 { | |
| 1817 for (int i = 0; i < T_VOID+1; i++) { | |
| 1818 if (_box_klasses[i] != NULL) { | |
| 1819 assert(i >= T_BOOLEAN, "checking"); | |
| 1820 f->do_oop((oop*) &_box_klasses[i]); | |
| 1821 } | |
| 1822 } | |
| 1823 } | |
| 1824 | |
| 1825 // The basic type mirrors would have already been processed in | |
| 1826 // Universe::oops_do(), via a call to shared_oops_do(), so should | |
| 1827 // not be processed again. | |
| 1828 | |
| 1829 f->do_oop((oop*) &_system_loader_lock_obj); | |
| 1830 FilteredFieldsMap::klasses_oops_do(f); | |
| 1831 } | |
| 1832 | |
| 1833 void SystemDictionary::lazily_loaded_oops_do(OopClosure* f) { | |
| 1834 f->do_oop((oop*) &_abstract_ownable_synchronizer_klass); | |
| 1835 } | |
| 1836 | |
| 1837 // Just the classes from defining class loaders | |
| 1838 // Don't iterate over placeholders | |
| 1839 void SystemDictionary::classes_do(void f(klassOop)) { | |
| 1840 dictionary()->classes_do(f); | |
| 1841 } | |
| 1842 | |
| 1843 // Added for initialize_itable_for_klass | |
| 1844 // Just the classes from defining class loaders | |
| 1845 // Don't iterate over placeholders | |
| 1846 void SystemDictionary::classes_do(void f(klassOop, TRAPS), TRAPS) { | |
| 1847 dictionary()->classes_do(f, CHECK); | |
| 1848 } | |
| 1849 | |
| 1850 // All classes, and their class loaders | |
| 1851 // Don't iterate over placeholders | |
| 1852 void SystemDictionary::classes_do(void f(klassOop, oop)) { | |
| 1853 dictionary()->classes_do(f); | |
| 1854 } | |
| 1855 | |
| 1856 // All classes, and their class loaders | |
| 1857 // (added for helpers that use HandleMarks and ResourceMarks) | |
| 1858 // Don't iterate over placeholders | |
| 1859 void SystemDictionary::classes_do(void f(klassOop, oop, TRAPS), TRAPS) { | |
| 1860 dictionary()->classes_do(f, CHECK); | |
| 1861 } | |
| 1862 | |
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1863 void SystemDictionary::placeholders_do(void f(Symbol*, oop)) { |
| 0 | 1864 placeholders()->entries_do(f); |
| 1865 } | |
| 1866 | |
| 1867 void SystemDictionary::methods_do(void f(methodOop)) { | |
| 1868 dictionary()->methods_do(f); | |
| 1903 | 1869 invoke_method_table()->methods_do(f); |
| 0 | 1870 } |
| 1871 | |
| 1872 // ---------------------------------------------------------------------------- | |
| 1873 // Lazily load klasses | |
| 1874 | |
| 1875 void SystemDictionary::load_abstract_ownable_synchronizer_klass(TRAPS) { | |
| 1876 assert(JDK_Version::is_gte_jdk16x_version(), "Must be JDK 1.6 or later"); | |
| 1877 | |
| 1878 // if multiple threads calling this function, only one thread will load | |
| 1879 // the class. The other threads will find the loaded version once the | |
| 1880 // class is loaded. | |
| 1881 klassOop aos = _abstract_ownable_synchronizer_klass; | |
| 1882 if (aos == NULL) { | |
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1883 klassOop k = resolve_or_fail(vmSymbols::java_util_concurrent_locks_AbstractOwnableSynchronizer(), true, CHECK); |
| 0 | 1884 // Force a fence to prevent any read before the write completes |
| 1885 OrderAccess::fence(); | |
| 1886 _abstract_ownable_synchronizer_klass = k; | |
| 1887 } | |
| 1888 } | |
| 1889 | |
| 1890 // ---------------------------------------------------------------------------- | |
| 1891 // Initialization | |
| 1892 | |
| 1893 void SystemDictionary::initialize(TRAPS) { | |
| 1894 // Allocate arrays | |
| 1895 assert(dictionary() == NULL, | |
| 1896 "SystemDictionary should only be initialized once"); | |
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1897 _sdgeneration = 0; |
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1898 _dictionary = new Dictionary(calculate_systemdictionary_size(PredictedLoadedClassCount)); |
| 1903 | 1899 _placeholders = new PlaceholderTable(_nof_buckets); |
| 0 | 1900 _number_of_modifications = 0; |
| 1903 | 1901 _loader_constraints = new LoaderConstraintTable(_loader_constraint_size); |
| 1902 _resolution_errors = new ResolutionErrorTable(_resolution_error_size); | |
| 1903 _invoke_method_table = new SymbolPropertyTable(_invoke_method_size); | |
| 0 | 1904 |
| 1905 // Allocate private object used as system class loader lock | |
| 1906 _system_loader_lock_obj = oopFactory::new_system_objArray(0, CHECK); | |
| 1907 // Initialize basic classes | |
| 1908 initialize_preloaded_classes(CHECK); | |
| 1909 } | |
| 1910 | |
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1911 // Compact table of directions on the initialization of klasses: |
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1912 static const short wk_init_info[] = { |
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1913 #define WK_KLASS_INIT_INFO(name, symbol, option) \ |
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1914 ( ((int)vmSymbols::VM_SYMBOL_ENUM_NAME(symbol) \ |
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1915 << SystemDictionary::CEIL_LG_OPTION_LIMIT) \ |
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1916 | (int)SystemDictionary::option ), |
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1917 WK_KLASSES_DO(WK_KLASS_INIT_INFO) |
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1918 #undef WK_KLASS_INIT_INFO |
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1919 0 |
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1920 }; |
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1921 |
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1922 bool SystemDictionary::initialize_wk_klass(WKID id, int init_opt, TRAPS) { |
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1923 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1924 int info = wk_init_info[id - FIRST_WKID]; |
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1925 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1926 Symbol* symbol = vmSymbols::symbol_at((vmSymbols::SID)sid); |
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1927 klassOop* klassp = &_well_known_klasses[id]; |
| 2460 | 1928 bool must_load = (init_opt < SystemDictionary::Opt); |
| 1929 bool try_load = true; | |
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1930 if (init_opt == SystemDictionary::Opt_Kernel) { |
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1931 #ifndef KERNEL |
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1932 try_load = false; |
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1933 #endif //KERNEL |
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1934 } |
| 2460 | 1935 if ((*klassp) == NULL && try_load) { |
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1936 if (must_load) { |
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1937 (*klassp) = resolve_or_fail(symbol, true, CHECK_0); // load required class |
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1938 } else { |
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1939 (*klassp) = resolve_or_null(symbol, CHECK_0); // load optional klass |
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1940 } |
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1941 } |
| 2460 | 1942 return ((*klassp) != NULL); |
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1943 } |
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1944 |
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1945 void SystemDictionary::initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS) { |
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1946 assert((int)start_id <= (int)limit_id, "IDs are out of order!"); |
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1947 for (int id = (int)start_id; id < (int)limit_id; id++) { |
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1948 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1949 int info = wk_init_info[id - FIRST_WKID]; |
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1950 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1951 int opt = (info & right_n_bits(CEIL_LG_OPTION_LIMIT)); |
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1952 |
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1953 initialize_wk_klass((WKID)id, opt, CHECK); |
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1954 |
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1955 // Update limits, so find_well_known_klass can be very fast: |
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1956 Symbol* s = vmSymbols::symbol_at((vmSymbols::SID)sid); |
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1957 if (wk_klass_name_limits[1] == NULL) { |
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1958 wk_klass_name_limits[0] = wk_klass_name_limits[1] = s; |
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1959 } else if (wk_klass_name_limits[1] < s) { |
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1960 wk_klass_name_limits[1] = s; |
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1961 } else if (wk_klass_name_limits[0] > s) { |
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1962 wk_klass_name_limits[0] = s; |
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1963 } |
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1964 } |
| 710 | 1965 |
| 1966 // move the starting value forward to the limit: | |
| 1967 start_id = limit_id; | |
|
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1968 } |
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1969 |
| 0 | 1970 |
| 1971 void SystemDictionary::initialize_preloaded_classes(TRAPS) { | |
| 1142 | 1972 assert(WK_KLASS(Object_klass) == NULL, "preloaded classes should only be initialized once"); |
| 0 | 1973 // Preload commonly used klasses |
|
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1974 WKID scan = FIRST_WKID; |
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1975 // first do Object, String, Class |
| 1142 | 1976 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Class_klass), scan, CHECK); |
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1977 |
| 6057 | 1978 // Calculate offsets for String and Class classes since they are loaded and |
| 1979 // can be used after this point. | |
| 1980 java_lang_String::compute_offsets(); | |
| 3938 | 1981 java_lang_Class::compute_offsets(); |
|
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1982 |
| 0 | 1983 // Fixup mirrors for classes loaded before java.lang.Class. |
| 1984 // These calls iterate over the objects currently in the perm gen | |
| 1985 // so calling them at this point is matters (not before when there | |
| 1986 // are fewer objects and not later after there are more objects | |
| 1987 // in the perm gen. | |
| 1988 Universe::initialize_basic_type_mirrors(CHECK); | |
| 1989 Universe::fixup_mirrors(CHECK); | |
| 1990 | |
|
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1991 // do a bunch more: |
| 1142 | 1992 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Reference_klass), scan, CHECK); |
| 0 | 1993 |
| 1994 // Preload ref klasses and set reference types | |
| 1142 | 1995 instanceKlass::cast(WK_KLASS(Reference_klass))->set_reference_type(REF_OTHER); |
| 1996 instanceRefKlass::update_nonstatic_oop_maps(WK_KLASS(Reference_klass)); | |
| 0 | 1997 |
| 1142 | 1998 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(PhantomReference_klass), scan, CHECK); |
| 1999 instanceKlass::cast(WK_KLASS(SoftReference_klass))->set_reference_type(REF_SOFT); | |
| 2000 instanceKlass::cast(WK_KLASS(WeakReference_klass))->set_reference_type(REF_WEAK); | |
| 2001 instanceKlass::cast(WK_KLASS(FinalReference_klass))->set_reference_type(REF_FINAL); | |
| 2002 instanceKlass::cast(WK_KLASS(PhantomReference_klass))->set_reference_type(REF_PHANTOM); | |
|
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2003 |
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2004 // JSR 292 classes |
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2005 WKID jsr292_group_start = WK_KLASS_ENUM_NAME(MethodHandle_klass); |
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2006 WKID jsr292_group_end = WK_KLASS_ENUM_NAME(VolatileCallSite_klass); |
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2007 initialize_wk_klasses_until(jsr292_group_start, scan, CHECK); |
|
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2008 if (EnableInvokeDynamic) { |
|
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2009 initialize_wk_klasses_through(jsr292_group_end, scan, CHECK); |
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2010 } else { |
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2011 // Skip the JSR 292 classes, if not enabled. |
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2012 scan = WKID(jsr292_group_end + 1); |
|
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2013 } |
| 710 | 2014 |
|
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2015 initialize_wk_klasses_until(WKID_LIMIT, scan, CHECK); |
| 0 | 2016 |
| 1142 | 2017 _box_klasses[T_BOOLEAN] = WK_KLASS(Boolean_klass); |
| 2018 _box_klasses[T_CHAR] = WK_KLASS(Character_klass); | |
| 2019 _box_klasses[T_FLOAT] = WK_KLASS(Float_klass); | |
| 2020 _box_klasses[T_DOUBLE] = WK_KLASS(Double_klass); | |
| 2021 _box_klasses[T_BYTE] = WK_KLASS(Byte_klass); | |
| 2022 _box_klasses[T_SHORT] = WK_KLASS(Short_klass); | |
| 2023 _box_klasses[T_INT] = WK_KLASS(Integer_klass); | |
| 2024 _box_klasses[T_LONG] = WK_KLASS(Long_klass); | |
|
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2025 //_box_klasses[T_OBJECT] = WK_KLASS(object_klass); |
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2026 //_box_klasses[T_ARRAY] = WK_KLASS(object_klass); |
| 0 | 2027 |
| 2028 #ifdef KERNEL | |
| 3938 | 2029 if (DownloadManager_klass() == NULL) { |
| 0 | 2030 warning("Cannot find sun/jkernel/DownloadManager"); |
| 2031 } | |
| 2032 #endif // KERNEL | |
| 514 | 2033 |
| 0 | 2034 { // Compute whether we should use loadClass or loadClassInternal when loading classes. |
| 1142 | 2035 methodOop method = instanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::loadClassInternal_name(), vmSymbols::string_class_signature()); |
| 0 | 2036 _has_loadClassInternal = (method != NULL); |
| 2037 } | |
| 2038 { // Compute whether we should use checkPackageAccess or NOT | |
| 1142 | 2039 methodOop method = instanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::checkPackageAccess_name(), vmSymbols::class_protectiondomain_signature()); |
| 0 | 2040 _has_checkPackageAccess = (method != NULL); |
| 2041 } | |
| 2042 } | |
| 2043 | |
| 2044 // Tells if a given klass is a box (wrapper class, such as java.lang.Integer). | |
| 2045 // If so, returns the basic type it holds. If not, returns T_OBJECT. | |
| 2046 BasicType SystemDictionary::box_klass_type(klassOop k) { | |
| 2047 assert(k != NULL, ""); | |
| 2048 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { | |
| 2049 if (_box_klasses[i] == k) | |
| 2050 return (BasicType)i; | |
| 2051 } | |
| 2052 return T_OBJECT; | |
| 2053 } | |
| 2054 | |
|
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2055 KlassHandle SystemDictionaryHandles::box_klass(BasicType t) { |
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2056 if (t >= T_BOOLEAN && t <= T_VOID) |
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2057 return KlassHandle(&SystemDictionary::_box_klasses[t], true); |
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2058 else |
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2059 return KlassHandle(); |
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2060 } |
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2061 |
| 0 | 2062 // Constraints on class loaders. The details of the algorithm can be |
| 2063 // found in the OOPSLA'98 paper "Dynamic Class Loading in the Java | |
| 2064 // Virtual Machine" by Sheng Liang and Gilad Bracha. The basic idea is | |
| 2065 // that the system dictionary needs to maintain a set of contraints that | |
| 2066 // must be satisfied by all classes in the dictionary. | |
| 2067 // if defining is true, then LinkageError if already in systemDictionary | |
| 2068 // if initiating loader, then ok if instanceKlass matches existing entry | |
| 2069 | |
| 2070 void SystemDictionary::check_constraints(int d_index, unsigned int d_hash, | |
| 2071 instanceKlassHandle k, | |
| 2072 Handle class_loader, bool defining, | |
| 2073 TRAPS) { | |
| 2074 const char *linkage_error = NULL; | |
| 2075 { | |
|
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2076 Symbol* name = k->name(); |
| 0 | 2077 MutexLocker mu(SystemDictionary_lock, THREAD); |
| 2078 | |
| 2079 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
| 2080 if (check != (klassOop)NULL) { | |
| 2081 // if different instanceKlass - duplicate class definition, | |
| 2082 // else - ok, class loaded by a different thread in parallel, | |
| 2083 // we should only have found it if it was done loading and ok to use | |
| 2084 // system dictionary only holds instance classes, placeholders | |
| 2085 // also holds array classes | |
| 2086 | |
| 2087 assert(check->klass_part()->oop_is_instance(), "noninstance in systemdictionary"); | |
| 2088 if ((defining == true) || (k() != check)) { | |
| 2089 linkage_error = "loader (instance of %s): attempted duplicate class " | |
| 2090 "definition for name: \"%s\""; | |
| 2091 } else { | |
| 2092 return; | |
| 2093 } | |
| 2094 } | |
| 2095 | |
| 2096 #ifdef ASSERT | |
|
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2097 Symbol* ph_check = find_placeholder(name, class_loader); |
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2098 assert(ph_check == NULL || ph_check == name, "invalid symbol"); |
| 0 | 2099 #endif |
| 2100 | |
| 2101 if (linkage_error == NULL) { | |
| 2102 if (constraints()->check_or_update(k, class_loader, name) == false) { | |
| 2103 linkage_error = "loader constraint violation: loader (instance of %s)" | |
| 2104 " previously initiated loading for a different type with name \"%s\""; | |
| 2105 } | |
| 2106 } | |
| 2107 } | |
| 2108 | |
| 2109 // Throw error now if needed (cannot throw while holding | |
| 2110 // SystemDictionary_lock because of rank ordering) | |
| 2111 | |
| 2112 if (linkage_error) { | |
| 2113 ResourceMark rm(THREAD); | |
| 2114 const char* class_loader_name = loader_name(class_loader()); | |
| 2115 char* type_name = k->name()->as_C_string(); | |
| 2116 size_t buflen = strlen(linkage_error) + strlen(class_loader_name) + | |
| 2117 strlen(type_name); | |
| 2118 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
| 2119 jio_snprintf(buf, buflen, linkage_error, class_loader_name, type_name); | |
| 2120 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); | |
| 2121 } | |
| 2122 } | |
| 2123 | |
| 2124 | |
| 2125 // Update system dictionary - done after check_constraint and add_to_hierachy | |
| 2126 // have been called. | |
| 2127 void SystemDictionary::update_dictionary(int d_index, unsigned int d_hash, | |
| 2128 int p_index, unsigned int p_hash, | |
| 2129 instanceKlassHandle k, | |
| 2130 Handle class_loader, | |
| 2131 TRAPS) { | |
| 2132 // Compile_lock prevents systemDictionary updates during compilations | |
| 2133 assert_locked_or_safepoint(Compile_lock); | |
|
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2134 Symbol* name = k->name(); |
| 0 | 2135 |
| 2136 { | |
| 2137 MutexLocker mu1(SystemDictionary_lock, THREAD); | |
| 2138 | |
| 2139 // See whether biased locking is enabled and if so set it for this | |
| 2140 // klass. | |
| 2141 // Note that this must be done past the last potential blocking | |
| 2142 // point / safepoint. We enable biased locking lazily using a | |
| 2143 // VM_Operation to iterate the SystemDictionary and installing the | |
| 2144 // biasable mark word into each instanceKlass's prototype header. | |
| 2145 // To avoid race conditions where we accidentally miss enabling the | |
| 2146 // optimization for one class in the process of being added to the | |
| 2147 // dictionary, we must not safepoint after the test of | |
| 2148 // BiasedLocking::enabled(). | |
| 2149 if (UseBiasedLocking && BiasedLocking::enabled()) { | |
| 2150 // Set biased locking bit for all loaded classes; it will be | |
| 2151 // cleared if revocation occurs too often for this type | |
| 2152 // NOTE that we must only do this when the class is initally | |
| 2153 // defined, not each time it is referenced from a new class loader | |
| 2154 if (k->class_loader() == class_loader()) { | |
| 2155 k->set_prototype_header(markOopDesc::biased_locking_prototype()); | |
| 2156 } | |
| 2157 } | |
| 2158 | |
|
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2159 // Assign a classid if one has not already been assigned. The |
|
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2160 // counter does not need to be atomically incremented since this |
|
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2161 // is only done while holding the SystemDictionary_lock. |
|
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2162 // All loaded classes get a unique ID. |
|
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|
2163 TRACE_INIT_ID(k); |
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|
2164 |
| 0 | 2165 // Check for a placeholder. If there, remove it and make a |
| 2166 // new system dictionary entry. | |
| 2167 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
| 2168 klassOop sd_check = find_class(d_index, d_hash, name, class_loader); | |
| 2169 if (sd_check == NULL) { | |
| 2170 dictionary()->add_klass(name, class_loader, k); | |
| 2171 notice_modification(); | |
| 2172 } | |
| 2173 #ifdef ASSERT | |
| 2174 sd_check = find_class(d_index, d_hash, name, class_loader); | |
| 2175 assert (sd_check != NULL, "should have entry in system dictionary"); | |
| 2176 // Changed to allow PH to remain to complete class circularity checking | |
| 2177 // while only one thread can define a class at one time, multiple | |
| 2178 // classes can resolve the superclass for a class at one time, | |
| 2179 // and the placeholder is used to track that | |
|
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2180 // Symbol* ph_check = find_placeholder(name, class_loader); |
| 0 | 2181 // assert (ph_check == NULL, "should not have a placeholder entry"); |
| 2182 #endif | |
| 2183 SystemDictionary_lock->notify_all(); | |
| 2184 } | |
| 2185 } | |
| 2186 | |
| 2187 | |
|
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2188 // Try to find a class name using the loader constraints. The |
|
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2189 // loader constraints might know about a class that isn't fully loaded |
|
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2190 // yet and these will be ignored. |
| 0 | 2191 klassOop SystemDictionary::find_constrained_instance_or_array_klass( |
|
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|
2192 Symbol* class_name, Handle class_loader, TRAPS) { |
| 0 | 2193 |
| 2194 // First see if it has been loaded directly. | |
| 2195 // Force the protection domain to be null. (This removes protection checks.) | |
| 2196 Handle no_protection_domain; | |
| 2197 klassOop klass = find_instance_or_array_klass(class_name, class_loader, | |
| 2198 no_protection_domain, CHECK_NULL); | |
| 2199 if (klass != NULL) | |
| 2200 return klass; | |
| 2201 | |
| 2202 // Now look to see if it has been loaded elsewhere, and is subject to | |
| 2203 // a loader constraint that would require this loader to return the | |
| 2204 // klass that is already loaded. | |
|
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2205 if (FieldType::is_array(class_name)) { |
| 1336 | 2206 // For array classes, their klassOops are not kept in the |
| 2207 // constraint table. The element klassOops are. | |
|
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2208 FieldArrayInfo fd; |
|
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|
2209 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
| 0 | 2210 if (t != T_OBJECT) { |
| 2211 klass = Universe::typeArrayKlassObj(t); | |
| 2212 } else { | |
| 2213 MutexLocker mu(SystemDictionary_lock, THREAD); | |
|
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2214 klass = constraints()->find_constrained_klass(fd.object_key(), class_loader); |
| 0 | 2215 } |
| 1336 | 2216 // If element class already loaded, allocate array klass |
| 0 | 2217 if (klass != NULL) { |
|
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2218 klass = Klass::cast(klass)->array_klass_or_null(fd.dimension()); |
| 0 | 2219 } |
| 2220 } else { | |
| 2221 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 2222 // Non-array classes are easy: simply check the constraint table. | |
| 2223 klass = constraints()->find_constrained_klass(class_name, class_loader); | |
| 2224 } | |
| 2225 | |
| 2226 return klass; | |
| 2227 } | |
| 2228 | |
| 2229 | |
|
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2230 bool SystemDictionary::add_loader_constraint(Symbol* class_name, |
| 0 | 2231 Handle class_loader1, |
| 2232 Handle class_loader2, | |
| 2233 Thread* THREAD) { | |
|
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2234 Symbol* constraint_name = NULL; |
|
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2235 if (!FieldType::is_array(class_name)) { |
| 1336 | 2236 constraint_name = class_name; |
| 2237 } else { | |
| 2238 // For array classes, their klassOops are not kept in the | |
| 2239 // constraint table. The element classes are. | |
|
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2240 FieldArrayInfo fd; |
|
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2241 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(false)); |
| 1336 | 2242 // primitive types always pass |
| 2243 if (t != T_OBJECT) { | |
| 2244 return true; | |
| 2245 } else { | |
|
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2246 constraint_name = fd.object_key(); |
| 1336 | 2247 } |
| 2248 } | |
| 2249 unsigned int d_hash1 = dictionary()->compute_hash(constraint_name, class_loader1); | |
| 0 | 2250 int d_index1 = dictionary()->hash_to_index(d_hash1); |
| 2251 | |
| 1336 | 2252 unsigned int d_hash2 = dictionary()->compute_hash(constraint_name, class_loader2); |
| 0 | 2253 int d_index2 = dictionary()->hash_to_index(d_hash2); |
| 2254 { | |
| 1336 | 2255 MutexLocker mu_s(SystemDictionary_lock, THREAD); |
| 0 | 2256 |
| 1336 | 2257 // Better never do a GC while we're holding these oops |
| 2258 No_Safepoint_Verifier nosafepoint; | |
| 0 | 2259 |
| 1336 | 2260 klassOop klass1 = find_class(d_index1, d_hash1, constraint_name, class_loader1); |
| 2261 klassOop klass2 = find_class(d_index2, d_hash2, constraint_name, class_loader2); | |
| 2262 return constraints()->add_entry(constraint_name, klass1, class_loader1, | |
| 2263 klass2, class_loader2); | |
| 0 | 2264 } |
| 2265 } | |
| 2266 | |
| 2267 // Add entry to resolution error table to record the error when the first | |
| 2268 // attempt to resolve a reference to a class has failed. | |
|
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2269 void SystemDictionary::add_resolution_error(constantPoolHandle pool, int which, Symbol* error) { |
| 0 | 2270 unsigned int hash = resolution_errors()->compute_hash(pool, which); |
| 2271 int index = resolution_errors()->hash_to_index(hash); | |
| 2272 { | |
| 2273 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
| 2274 resolution_errors()->add_entry(index, hash, pool, which, error); | |
| 2275 } | |
| 2276 } | |
| 2277 | |
| 2278 // Lookup resolution error table. Returns error if found, otherwise NULL. | |
|
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2279 Symbol* SystemDictionary::find_resolution_error(constantPoolHandle pool, int which) { |
| 0 | 2280 unsigned int hash = resolution_errors()->compute_hash(pool, which); |
| 2281 int index = resolution_errors()->hash_to_index(hash); | |
| 2282 { | |
| 2283 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
| 2284 ResolutionErrorEntry* entry = resolution_errors()->find_entry(index, hash, pool, which); | |
|
2177
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|
2285 return (entry != NULL) ? entry->error() : (Symbol*)NULL; |
| 0 | 2286 } |
| 2287 } | |
| 2288 | |
| 2289 | |
|
665
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|
2290 // Signature constraints ensure that callers and callees agree about |
|
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|
2291 // the meaning of type names in their signatures. This routine is the |
|
c89f86385056
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diff
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|
2292 // intake for constraints. It collects them from several places: |
|
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diff
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|
2293 // |
|
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|
2294 // * LinkResolver::resolve_method (if check_access is true) requires |
|
c89f86385056
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diff
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|
2295 // that the resolving class (the caller) and the defining class of |
|
c89f86385056
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diff
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|
2296 // the resolved method (the callee) agree on each type in the |
|
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diff
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|
2297 // method's signature. |
|
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|
2298 // |
|
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|
2299 // * LinkResolver::resolve_interface_method performs exactly the same |
|
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diff
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|
2300 // checks. |
|
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|
2301 // |
|
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|
2302 // * LinkResolver::resolve_field requires that the constant pool |
|
c89f86385056
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diff
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|
2303 // attempting to link to a field agree with the field's defining |
|
c89f86385056
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diff
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|
2304 // class about the type of the field signature. |
|
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diff
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|
2305 // |
|
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|
2306 // * klassVtable::initialize_vtable requires that, when a class |
|
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diff
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|
2307 // overrides a vtable entry allocated by a superclass, that the |
|
c89f86385056
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|
2308 // overriding method (i.e., the callee) agree with the superclass |
|
c89f86385056
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|
2309 // on each type in the method's signature. |
|
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|
2310 // |
|
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|
2311 // * klassItable::initialize_itable requires that, when a class fills |
|
c89f86385056
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diff
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|
2312 // in its itables, for each non-abstract method installed in an |
|
c89f86385056
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diff
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|
2313 // itable, the method (i.e., the callee) agree with the interface |
|
c89f86385056
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|
2314 // on each type in the method's signature. |
|
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diff
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|
2315 // |
|
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diff
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|
2316 // All those methods have a boolean (check_access, checkconstraints) |
|
c89f86385056
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579
diff
changeset
|
2317 // which turns off the checks. This is used from specialized contexts |
|
c89f86385056
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diff
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|
2318 // such as bootstrapping, dumping, and debugging. |
|
c89f86385056
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579
diff
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|
2319 // |
|
c89f86385056
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579
diff
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|
2320 // No direct constraint is placed between the class and its |
|
c89f86385056
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579
diff
changeset
|
2321 // supertypes. Constraints are only placed along linked relations |
|
c89f86385056
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579
diff
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|
2322 // between callers and callees. When a method overrides or implements |
|
c89f86385056
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jrose
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579
diff
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|
2323 // an abstract method in a supertype (superclass or interface), the |
|
c89f86385056
6814659: separable cleanups and subroutines for 6655638
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579
diff
changeset
|
2324 // constraints are placed as if the supertype were the caller to the |
|
c89f86385056
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579
diff
changeset
|
2325 // overriding method. (This works well, since callers to the |
|
c89f86385056
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jrose
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579
diff
changeset
|
2326 // supertype have already established agreement between themselves and |
|
c89f86385056
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jrose
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579
diff
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|
2327 // the supertype.) As a result of all this, a class can disagree with |
|
c89f86385056
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parents:
579
diff
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|
2328 // its supertype about the meaning of a type name, as long as that |
|
c89f86385056
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jrose
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579
diff
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|
2329 // class neither calls a relevant method of the supertype, nor is |
|
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
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579
diff
changeset
|
2330 // called (perhaps via an override) from the supertype. |
|
c89f86385056
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jrose
parents:
579
diff
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|
2331 // |
|
c89f86385056
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579
diff
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|
2332 // |
|
c89f86385056
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579
diff
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|
2333 // SystemDictionary::check_signature_loaders(sig, l1, l2) |
|
c89f86385056
6814659: separable cleanups and subroutines for 6655638
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parents:
579
diff
changeset
|
2334 // |
| 0 | 2335 // Make sure all class components (including arrays) in the given |
| 2336 // signature will be resolved to the same class in both loaders. | |
| 2337 // Returns the name of the type that failed a loader constraint check, or | |
| 2338 // NULL if no constraint failed. The returned C string needs cleaning up | |
|
665
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
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579
diff
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|
2339 // with a ResourceMark in the caller. No exception except OOME is thrown. |
| 1336 | 2340 // Arrays are not added to the loader constraint table, their elements are. |
|
2177
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2001
diff
changeset
|
2341 char* SystemDictionary::check_signature_loaders(Symbol* signature, |
| 0 | 2342 Handle loader1, Handle loader2, |
| 2343 bool is_method, TRAPS) { | |
| 2344 // Nothing to do if loaders are the same. | |
| 2345 if (loader1() == loader2()) { | |
| 2346 return NULL; | |
| 2347 } | |
| 2348 | |
|
2177
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6990754: Use native memory and reference counting to implement SymbolTable
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diff
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|
2349 ResourceMark rm(THREAD); |
| 0 | 2350 SignatureStream sig_strm(signature, is_method); |
| 2351 while (!sig_strm.is_done()) { | |
| 2352 if (sig_strm.is_object()) { | |
|
2177
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6990754: Use native memory and reference counting to implement SymbolTable
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diff
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|
2353 Symbol* s = sig_strm.as_symbol(CHECK_NULL); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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2001
diff
changeset
|
2354 Symbol* sig = s; |
| 0 | 2355 if (!add_loader_constraint(sig, loader1, loader2, THREAD)) { |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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2001
diff
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|
2356 return sig->as_C_string(); |
| 0 | 2357 } |
| 2358 } | |
| 2359 sig_strm.next(); | |
| 2360 } | |
| 2361 return NULL; | |
| 2362 } | |
| 2363 | |
| 2364 | |
|
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2365 methodHandle SystemDictionary::find_method_handle_intrinsic(vmIntrinsics::ID iid, |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2366 Symbol* signature, |
|
1d7922586cf6
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twisti
parents:
6217
diff
changeset
|
2367 TRAPS) { |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2368 methodHandle empty; |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2369 assert(EnableInvokeDynamic, ""); |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2370 assert(MethodHandles::is_signature_polymorphic(iid) && |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2371 MethodHandles::is_signature_polymorphic_intrinsic(iid) && |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2372 iid != vmIntrinsics::_invokeGeneric, |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2373 err_msg("must be a known MH intrinsic iid=%d: %s", iid, vmIntrinsics::name_at(iid))); |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2374 |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2375 unsigned int hash = invoke_method_table()->compute_hash(signature, iid); |
| 710 | 2376 int index = invoke_method_table()->hash_to_index(hash); |
|
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
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|
2377 SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, iid); |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2378 methodHandle m; |
| 710 | 2379 if (spe == NULL || spe->property_oop() == NULL) { |
|
1508
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
jrose
parents:
1507
diff
changeset
|
2380 spe = NULL; |
| 710 | 2381 // Must create lots of stuff here, but outside of the SystemDictionary lock. |
|
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2382 m = methodOopDesc::make_method_handle_intrinsic(iid, signature, CHECK_(empty)); |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2383 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_highest_tier, |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2384 methodHandle(), CompileThreshold, "MH", CHECK_(empty)); |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2385 |
| 710 | 2386 // Now grab the lock. We might have to throw away the new method, |
| 2387 // if a racing thread has managed to install one at the same time. | |
|
6266
1d7922586cf6
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twisti
parents:
6217
diff
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|
2388 { |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2389 MutexLocker ml(SystemDictionary_lock, THREAD); |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2390 spe = invoke_method_table()->find_entry(index, hash, signature, iid); |
| 710 | 2391 if (spe == NULL) |
|
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2392 spe = invoke_method_table()->add_entry(index, hash, signature, iid); |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2393 if (spe->property_oop() == NULL) |
| 710 | 2394 spe->set_property_oop(m()); |
|
6266
1d7922586cf6
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twisti
parents:
6217
diff
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|
2395 } |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2396 } |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2397 |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2398 assert(spe != NULL && spe->property_oop() != NULL, ""); |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2399 m = methodOop(spe->property_oop()); |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2400 assert(m->is_method(), ""); |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2401 |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2402 return m; |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2403 } |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2404 |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2405 // Helper for unpacking the return value from linkMethod and linkCallSite. |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2406 static methodHandle unpack_method_and_appendix(Handle mname, |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2407 objArrayHandle appendix_box, |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2408 Handle* appendix_result, |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2409 TRAPS) { |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2410 methodHandle empty; |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2411 if (mname.not_null()) { |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2412 oop vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2413 if (vmtarget != NULL && vmtarget->is_method()) { |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2414 methodOop m = methodOop(vmtarget); |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2415 oop appendix = appendix_box->obj_at(0); |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2416 if (TraceMethodHandles) { |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2417 #ifndef PRODUCT |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2418 tty->print("Linked method="INTPTR_FORMAT": ", m); |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2419 m->print(); |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2420 if (appendix != NULL) { tty->print("appendix = "); appendix->print(); } |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2421 tty->cr(); |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2422 #endif //PRODUCT |
|
3363
167b70ff3abc
6939861: JVM should handle more conversion operations
never
parents:
3245
diff
changeset
|
2423 } |
|
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2424 (*appendix_result) = Handle(THREAD, appendix); |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2425 return methodHandle(THREAD, m); |
| 710 | 2426 } |
| 2427 } | |
|
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2428 THROW_MSG_(vmSymbols::java_lang_LinkageError(), "bad value from MethodHandleNatives", empty); |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2429 return empty; |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2430 } |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6217
diff
changeset
|
2431 |
|
1d7922586cf6
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2432 methodHandle SystemDictionary::find_method_handle_invoker(Symbol* name, |
|
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2433 Symbol* signature, |
|
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|
2434 KlassHandle accessing_klass, |
|
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|
2435 Handle* appendix_result, |
|
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|
2436 TRAPS) { |
|
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|
2437 methodHandle empty; |
|
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|
2438 assert(EnableInvokeDynamic, ""); |
|
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|
2439 assert(!THREAD->is_Compiler_thread(), ""); |
|
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|
2440 Handle method_type = |
|
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|
2441 SystemDictionary::find_method_handle_type(signature, accessing_klass, CHECK_(empty)); |
|
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2442 if (false) { // FIXME: Decide if the Java upcall should resolve signatures. |
|
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2443 method_type = java_lang_String::create_from_symbol(signature, CHECK_(empty)); |
|
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2444 } |
|
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2445 |
|
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2446 KlassHandle mh_klass = SystemDictionaryHandles::MethodHandle_klass(); |
|
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2447 int ref_kind = JVM_REF_invokeVirtual; |
|
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2448 Handle name_str = StringTable::intern(name, CHECK_(empty)); |
|
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2449 objArrayHandle appendix_box = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1, CHECK_(empty)); |
|
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2450 assert(appendix_box->obj_at(0) == NULL, ""); |
|
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2451 |
|
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|
2452 // call java.lang.invoke.MethodHandleNatives::linkMethod(... String, MethodType) -> MemberName |
|
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|
2453 JavaCallArguments args; |
|
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|
2454 args.push_oop(accessing_klass()->java_mirror()); |
|
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|
2455 args.push_int(ref_kind); |
|
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|
2456 args.push_oop(mh_klass()->java_mirror()); |
|
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|
2457 args.push_oop(name_str()); |
|
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|
2458 args.push_oop(method_type()); |
|
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|
2459 args.push_oop(appendix_box()); |
|
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|
2460 JavaValue result(T_OBJECT); |
|
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|
2461 JavaCalls::call_static(&result, |
|
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|
2462 SystemDictionary::MethodHandleNatives_klass(), |
|
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|
2463 vmSymbols::linkMethod_name(), |
|
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|
2464 vmSymbols::linkMethod_signature(), |
|
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|
2465 &args, CHECK_(empty)); |
|
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|
2466 Handle mname(THREAD, (oop) result.get_jobject()); |
|
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|
2467 return unpack_method_and_appendix(mname, appendix_box, appendix_result, THREAD); |
| 710 | 2468 } |
| 2469 | |
|
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|
2470 |
|
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|
2471 // Ask Java code to find or construct a java.lang.invoke.MethodType for the given |
| 710 | 2472 // signature, as interpreted relative to the given class loader. |
| 2473 // Because of class loader constraints, all method handle usage must be | |
| 2474 // consistent with this loader. | |
|
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|
2475 Handle SystemDictionary::find_method_handle_type(Symbol* signature, |
|
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|
2476 KlassHandle accessing_klass, |
|
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|
2477 TRAPS) { |
|
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|
2478 Handle empty; |
|
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|
2479 vmIntrinsics::ID null_iid = vmIntrinsics::_none; // distinct from all method handle invoker intrinsics |
|
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|
2480 unsigned int hash = invoke_method_table()->compute_hash(signature, null_iid); |
|
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|
2481 int index = invoke_method_table()->hash_to_index(hash); |
|
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|
2482 SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, null_iid); |
|
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|
2483 if (spe != NULL && spe->property_oop() != NULL) { |
|
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|
2484 assert(java_lang_invoke_MethodType::is_instance(spe->property_oop()), ""); |
|
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|
2485 return Handle(THREAD, spe->property_oop()); |
|
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|
2486 } else if (THREAD->is_Compiler_thread()) { |
|
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|
2487 warning("SystemDictionary::find_method_handle_type called from compiler thread"); // FIXME |
|
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|
2488 return Handle(); // do not attempt from within compiler, unless it was cached |
|
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|
2489 } |
|
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|
2490 |
|
1508
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|
2491 Handle class_loader, protection_domain; |
|
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|
2492 bool is_on_bcp = true; // keep this true as long as we can materialize from the boot classloader |
|
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|
2493 int npts = ArgumentCount(signature).size(); |
| 1142 | 2494 objArrayHandle pts = oopFactory::new_objArray(SystemDictionary::Class_klass(), npts, CHECK_(empty)); |
| 710 | 2495 int arg = 0; |
| 2496 Handle rt; // the return type from the signature | |
|
2177
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|
2497 ResourceMark rm(THREAD); |
|
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|
2498 for (SignatureStream ss(signature); !ss.is_done(); ss.next()) { |
|
1508
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|
2499 oop mirror = NULL; |
|
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|
2500 if (is_on_bcp) { |
|
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|
2501 // Note: class_loader & protection_domain are both null at this point. |
|
1508
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|
2502 mirror = ss.as_java_mirror(class_loader, protection_domain, |
|
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|
2503 SignatureStream::ReturnNull, CHECK_(empty)); |
|
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|
2504 if (mirror == NULL) { |
|
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|
2505 // fall back from BCP to accessing_klass |
|
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|
2506 if (accessing_klass.not_null()) { |
|
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|
2507 class_loader = Handle(THREAD, instanceKlass::cast(accessing_klass())->class_loader()); |
|
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|
2508 protection_domain = Handle(THREAD, instanceKlass::cast(accessing_klass())->protection_domain()); |
|
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|
2509 } |
|
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|
2510 is_on_bcp = false; |
|
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|
2511 } |
|
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|
2512 } |
|
2ffde6cfe049
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|
2513 if (!is_on_bcp) { |
|
2ffde6cfe049
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diff
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|
2514 // Resolve, throwing a real error if it doesn't work. |
|
2ffde6cfe049
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diff
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|
2515 mirror = ss.as_java_mirror(class_loader, protection_domain, |
|
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|
2516 SignatureStream::NCDFError, CHECK_(empty)); |
| 710 | 2517 } |
| 2518 if (ss.at_return_type()) | |
| 2519 rt = Handle(THREAD, mirror); | |
| 2520 else | |
| 2521 pts->obj_at_put(arg++, mirror); | |
|
6266
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|
2522 |
|
1508
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|
2523 // Check accessibility. |
|
2ffde6cfe049
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|
2524 if (ss.is_object() && accessing_klass.not_null()) { |
|
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|
2525 klassOop sel_klass = java_lang_Class::as_klassOop(mirror); |
|
6266
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|
2526 mirror = NULL; // safety |
|
1508
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|
2527 // Emulate constantPoolOopDesc::verify_constant_pool_resolve. |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
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|
2528 if (Klass::cast(sel_klass)->oop_is_objArray()) |
|
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|
2529 sel_klass = objArrayKlass::cast(sel_klass)->bottom_klass(); |
|
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|
2530 if (Klass::cast(sel_klass)->oop_is_instance()) { |
|
2ffde6cfe049
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|
2531 KlassHandle sel_kh(THREAD, sel_klass); |
|
2ffde6cfe049
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|
2532 LinkResolver::check_klass_accessability(accessing_klass, sel_kh, CHECK_(empty)); |
|
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|
2533 } |
|
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|
2534 } |
| 710 | 2535 } |
| 2536 assert(arg == npts, ""); | |
| 2537 | |
|
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|
2538 // call java.lang.invoke.MethodHandleNatives::findMethodType(Class rt, Class[] pts) -> MethodType |
| 710 | 2539 JavaCallArguments args(Handle(THREAD, rt())); |
| 2540 args.push_oop(pts()); | |
| 2541 JavaValue result(T_OBJECT); | |
| 2542 JavaCalls::call_static(&result, | |
|
1507
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diff
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|
2543 SystemDictionary::MethodHandleNatives_klass(), |
|
cd5dbf694d45
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1339
diff
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|
2544 vmSymbols::findMethodHandleType_name(), |
| 2460 | 2545 vmSymbols::findMethodHandleType_signature(), |
| 710 | 2546 &args, CHECK_(empty)); |
|
1793
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
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diff
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|
2547 Handle method_type(THREAD, (oop) result.get_jobject()); |
|
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
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1660
diff
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|
2548 |
|
6266
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|
2549 if (is_on_bcp) { |
|
1d7922586cf6
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|
2550 // We can cache this MethodType inside the JVM. |
|
1d7922586cf6
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|
2551 MutexLocker ml(SystemDictionary_lock, THREAD); |
|
1d7922586cf6
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|
2552 spe = invoke_method_table()->find_entry(index, hash, signature, null_iid); |
|
1d7922586cf6
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|
2553 if (spe == NULL) |
|
1d7922586cf6
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diff
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|
2554 spe = invoke_method_table()->add_entry(index, hash, signature, null_iid); |
|
1d7922586cf6
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|
2555 if (spe->property_oop() == NULL) { |
|
1d7922586cf6
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6217
diff
changeset
|
2556 spe->set_property_oop(method_type()); |
|
1793
d257356e35f0
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diff
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|
2557 } |
|
d257356e35f0
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diff
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|
2558 } |
|
1508
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|
2559 |
|
6266
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|
2560 // report back to the caller with the MethodType |
|
1793
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diff
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|
2561 return method_type; |
| 710 | 2562 } |
| 2563 | |
| 1602 | 2564 // Ask Java code to find or construct a method handle constant. |
| 2565 Handle SystemDictionary::link_method_handle_constant(KlassHandle caller, | |
| 2566 int ref_kind, //e.g., JVM_REF_invokeVirtual | |
| 2567 KlassHandle callee, | |
|
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|
2568 Symbol* name_sym, |
|
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|
2569 Symbol* signature, |
| 1602 | 2570 TRAPS) { |
| 2571 Handle empty; | |
|
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2572 Handle name = java_lang_String::create_from_symbol(name_sym, CHECK_(empty)); |
| 1602 | 2573 Handle type; |
| 2574 if (signature->utf8_length() > 0 && signature->byte_at(0) == '(') { | |
|
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2575 type = find_method_handle_type(signature, caller, CHECK_(empty)); |
| 1602 | 2576 } else { |
|
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2577 ResourceMark rm(THREAD); |
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2578 SignatureStream ss(signature, false); |
| 1602 | 2579 if (!ss.is_done()) { |
| 2580 oop mirror = ss.as_java_mirror(caller->class_loader(), caller->protection_domain(), | |
| 2581 SignatureStream::NCDFError, CHECK_(empty)); | |
| 2582 type = Handle(THREAD, mirror); | |
| 2583 ss.next(); | |
| 2584 if (!ss.is_done()) type = Handle(); // error! | |
| 2585 } | |
| 2586 } | |
| 2587 if (type.is_null()) { | |
| 2588 THROW_MSG_(vmSymbols::java_lang_LinkageError(), "bad signature", empty); | |
| 2589 } | |
| 2590 | |
|
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2591 // call java.lang.invoke.MethodHandleNatives::linkMethodHandleConstant(Class caller, int refKind, Class callee, String name, Object type) -> MethodHandle |
| 1602 | 2592 JavaCallArguments args; |
| 2593 args.push_oop(caller->java_mirror()); // the referring class | |
| 2594 args.push_int(ref_kind); | |
| 2595 args.push_oop(callee->java_mirror()); // the target class | |
| 2596 args.push_oop(name()); | |
| 2597 args.push_oop(type()); | |
| 2598 JavaValue result(T_OBJECT); | |
| 2599 JavaCalls::call_static(&result, | |
| 2600 SystemDictionary::MethodHandleNatives_klass(), | |
| 2601 vmSymbols::linkMethodHandleConstant_name(), | |
| 2460 | 2602 vmSymbols::linkMethodHandleConstant_signature(), |
| 1602 | 2603 &args, CHECK_(empty)); |
| 2604 return Handle(THREAD, (oop) result.get_jobject()); | |
| 2605 } | |
| 710 | 2606 |
|
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2607 // Ask Java code to find or construct a java.lang.invoke.CallSite for the given |
|
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2608 // name and signature, as interpreted relative to the given class loader. |
|
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2609 methodHandle SystemDictionary::find_dynamic_call_site_invoker(KlassHandle caller, |
|
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2610 Handle bootstrap_specifier, |
|
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2611 Symbol* name, |
|
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2612 Symbol* type, |
|
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2613 Handle* appendix_result, |
|
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2614 TRAPS) { |
|
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2615 methodHandle empty; |
|
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2616 Handle bsm, info; |
|
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2617 if (java_lang_invoke_MethodHandle::is_instance(bootstrap_specifier())) { |
|
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2618 bsm = bootstrap_specifier; |
|
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2619 } else { |
|
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2620 assert(bootstrap_specifier->is_objArray(), ""); |
|
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2621 objArrayHandle args(THREAD, (objArrayOop) bootstrap_specifier()); |
|
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2622 int len = args->length(); |
|
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2623 assert(len >= 1, ""); |
|
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2624 bsm = Handle(THREAD, args->obj_at(0)); |
|
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2625 if (len > 1) { |
|
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2626 objArrayOop args1 = oopFactory::new_objArray(SystemDictionary::Object_klass(), len-1, CHECK_(empty)); |
|
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2627 for (int i = 1; i < len; i++) |
|
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2628 args1->obj_at_put(i-1, args->obj_at(i)); |
|
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2629 info = Handle(THREAD, args1); |
|
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2630 } |
|
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|
2631 } |
|
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|
2632 guarantee(java_lang_invoke_MethodHandle::is_instance(bsm()), |
|
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|
2633 "caller must supply a valid BSM"); |
|
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|
2634 |
|
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2635 Handle method_name = java_lang_String::create_from_symbol(name, CHECK_(empty)); |
|
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2636 Handle method_type = find_method_handle_type(type, caller, CHECK_(empty)); |
|
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2637 |
|
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2638 objArrayHandle appendix_box = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1, CHECK_(empty)); |
|
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2639 assert(appendix_box->obj_at(0) == NULL, ""); |
|
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2640 |
|
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|
2641 // call java.lang.invoke.MethodHandleNatives::linkCallSite(caller, bsm, name, mtype, info, &appendix) |
|
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2642 JavaCallArguments args; |
|
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2643 args.push_oop(caller->java_mirror()); |
|
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2644 args.push_oop(bsm()); |
|
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2645 args.push_oop(method_name()); |
|
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2646 args.push_oop(method_type()); |
|
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|
2647 args.push_oop(info()); |
|
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2648 args.push_oop(appendix_box); |
|
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2649 JavaValue result(T_OBJECT); |
|
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2650 JavaCalls::call_static(&result, |
|
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|
2651 SystemDictionary::MethodHandleNatives_klass(), |
|
6266
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2652 vmSymbols::linkCallSite_name(), |
|
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|
2653 vmSymbols::linkCallSite_signature(), |
|
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|
2654 &args, CHECK_(empty)); |
|
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2655 Handle mname(THREAD, (oop) result.get_jobject()); |
|
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2656 return unpack_method_and_appendix(mname, appendix_box, appendix_result, THREAD); |
|
726
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|
2657 } |
|
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|
2658 |
| 0 | 2659 // Since the identity hash code for symbols changes when the symbols are |
| 2660 // moved from the regular perm gen (hash in the mark word) to the shared | |
| 2661 // spaces (hash is the address), the classes loaded into the dictionary | |
| 2662 // may be in the wrong buckets. | |
| 2663 | |
| 2664 void SystemDictionary::reorder_dictionary() { | |
| 2665 dictionary()->reorder_dictionary(); | |
| 2666 } | |
| 2667 | |
| 2668 | |
| 2669 void SystemDictionary::copy_buckets(char** top, char* end) { | |
| 2670 dictionary()->copy_buckets(top, end); | |
| 2671 } | |
| 2672 | |
| 2673 | |
| 2674 void SystemDictionary::copy_table(char** top, char* end) { | |
| 2675 dictionary()->copy_table(top, end); | |
| 2676 } | |
| 2677 | |
| 2678 | |
| 2679 void SystemDictionary::reverse() { | |
| 2680 dictionary()->reverse(); | |
| 2681 } | |
| 2682 | |
| 2683 int SystemDictionary::number_of_classes() { | |
| 2684 return dictionary()->number_of_entries(); | |
| 2685 } | |
| 2686 | |
| 2687 | |
| 2688 // ---------------------------------------------------------------------------- | |
| 2689 #ifndef PRODUCT | |
| 2690 | |
| 2691 void SystemDictionary::print() { | |
| 2692 dictionary()->print(); | |
| 2693 | |
| 2694 // Placeholders | |
| 2695 GCMutexLocker mu(SystemDictionary_lock); | |
| 2696 placeholders()->print(); | |
| 2697 | |
| 2698 // loader constraints - print under SD_lock | |
| 2699 constraints()->print(); | |
| 2700 } | |
| 2701 | |
| 2702 #endif | |
| 2703 | |
| 2704 void SystemDictionary::verify() { | |
| 2705 guarantee(dictionary() != NULL, "Verify of system dictionary failed"); | |
| 2706 guarantee(constraints() != NULL, | |
| 2707 "Verify of loader constraints failed"); | |
| 2708 guarantee(dictionary()->number_of_entries() >= 0 && | |
| 2709 placeholders()->number_of_entries() >= 0, | |
| 2710 "Verify of system dictionary failed"); | |
| 2711 | |
| 2712 // Verify dictionary | |
| 2713 dictionary()->verify(); | |
| 2714 | |
| 2715 GCMutexLocker mu(SystemDictionary_lock); | |
| 2716 placeholders()->verify(); | |
| 2717 | |
| 2718 // Verify constraint table | |
| 2719 guarantee(constraints() != NULL, "Verify of loader constraints failed"); | |
|
1258
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|
2720 constraints()->verify(dictionary(), placeholders()); |
| 0 | 2721 } |
| 2722 | |
| 2723 | |
| 2724 void SystemDictionary::verify_obj_klass_present(Handle obj, | |
|
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2725 Symbol* class_name, |
| 0 | 2726 Handle class_loader) { |
| 2727 GCMutexLocker mu(SystemDictionary_lock); | |
|
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2728 Symbol* name; |
|
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|
2729 |
|
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|
2730 klassOop probe = find_class(class_name, class_loader); |
| 0 | 2731 if (probe == NULL) { |
| 2732 probe = SystemDictionary::find_shared_class(class_name); | |
|
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2733 if (probe == NULL) { |
|
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|
2734 name = find_placeholder(class_name, class_loader); |
|
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|
2735 } |
| 0 | 2736 } |
|
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|
2737 guarantee(probe != NULL || name != NULL, |
|
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|
2738 "Loaded klasses should be in SystemDictionary"); |
| 0 | 2739 } |
| 2740 | |
| 2741 #ifndef PRODUCT | |
| 2742 | |
| 2743 // statistics code | |
| 2744 class ClassStatistics: AllStatic { | |
| 2745 private: | |
| 2746 static int nclasses; // number of classes | |
| 2747 static int nmethods; // number of methods | |
| 2748 static int nmethoddata; // number of methodData | |
| 2749 static int class_size; // size of class objects in words | |
| 2750 static int method_size; // size of method objects in words | |
| 2751 static int debug_size; // size of debug info in methods | |
| 2752 static int methoddata_size; // size of methodData objects in words | |
| 2753 | |
| 2754 static void do_class(klassOop k) { | |
| 2755 nclasses++; | |
| 2756 class_size += k->size(); | |
| 2757 if (k->klass_part()->oop_is_instance()) { | |
| 2758 instanceKlass* ik = (instanceKlass*)k->klass_part(); | |
| 2759 class_size += ik->methods()->size(); | |
| 2760 class_size += ik->constants()->size(); | |
| 2761 class_size += ik->local_interfaces()->size(); | |
| 2762 class_size += ik->transitive_interfaces()->size(); | |
| 2763 // We do not have to count implementors, since we only store one! | |
|
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|
2764 class_size += ik->fields()->length(); |
| 0 | 2765 } |
| 2766 } | |
| 2767 | |
| 2768 static void do_method(methodOop m) { | |
| 2769 nmethods++; | |
| 2770 method_size += m->size(); | |
| 2771 // class loader uses same objArray for empty vectors, so don't count these | |
| 2772 if (m->has_stackmap_table()) { | |
| 2773 method_size += m->stackmap_data()->size(); | |
| 2774 } | |
| 2775 | |
| 2776 methodDataOop mdo = m->method_data(); | |
| 2777 if (mdo != NULL) { | |
| 2778 nmethoddata++; | |
| 2779 methoddata_size += mdo->size(); | |
| 2780 } | |
| 2781 } | |
| 2782 | |
| 2783 public: | |
| 2784 static void print() { | |
| 2785 SystemDictionary::classes_do(do_class); | |
| 2786 SystemDictionary::methods_do(do_method); | |
| 2787 tty->print_cr("Class statistics:"); | |
| 2788 tty->print_cr("%d classes (%d bytes)", nclasses, class_size * oopSize); | |
| 2789 tty->print_cr("%d methods (%d bytes = %d base + %d debug info)", nmethods, | |
| 2790 (method_size + debug_size) * oopSize, method_size * oopSize, debug_size * oopSize); | |
| 2791 tty->print_cr("%d methoddata (%d bytes)", nmethoddata, methoddata_size * oopSize); | |
| 2792 } | |
| 2793 }; | |
| 2794 | |
| 2795 | |
| 2796 int ClassStatistics::nclasses = 0; | |
| 2797 int ClassStatistics::nmethods = 0; | |
| 2798 int ClassStatistics::nmethoddata = 0; | |
| 2799 int ClassStatistics::class_size = 0; | |
| 2800 int ClassStatistics::method_size = 0; | |
| 2801 int ClassStatistics::debug_size = 0; | |
| 2802 int ClassStatistics::methoddata_size = 0; | |
| 2803 | |
| 2804 void SystemDictionary::print_class_statistics() { | |
| 2805 ResourceMark rm; | |
| 2806 ClassStatistics::print(); | |
| 2807 } | |
| 2808 | |
| 2809 | |
| 2810 class MethodStatistics: AllStatic { | |
| 2811 public: | |
| 2812 enum { | |
| 2813 max_parameter_size = 10 | |
| 2814 }; | |
| 2815 private: | |
| 2816 | |
| 2817 static int _number_of_methods; | |
| 2818 static int _number_of_final_methods; | |
| 2819 static int _number_of_static_methods; | |
| 2820 static int _number_of_native_methods; | |
| 2821 static int _number_of_synchronized_methods; | |
| 2822 static int _number_of_profiled_methods; | |
| 2823 static int _number_of_bytecodes; | |
| 2824 static int _parameter_size_profile[max_parameter_size]; | |
| 2825 static int _bytecodes_profile[Bytecodes::number_of_java_codes]; | |
| 2826 | |
| 2827 static void initialize() { | |
| 2828 _number_of_methods = 0; | |
| 2829 _number_of_final_methods = 0; | |
| 2830 _number_of_static_methods = 0; | |
| 2831 _number_of_native_methods = 0; | |
| 2832 _number_of_synchronized_methods = 0; | |
| 2833 _number_of_profiled_methods = 0; | |
| 2834 _number_of_bytecodes = 0; | |
| 2835 for (int i = 0; i < max_parameter_size ; i++) _parameter_size_profile[i] = 0; | |
| 2836 for (int j = 0; j < Bytecodes::number_of_java_codes; j++) _bytecodes_profile [j] = 0; | |
| 2837 }; | |
| 2838 | |
| 2839 static void do_method(methodOop m) { | |
| 2840 _number_of_methods++; | |
| 2841 // collect flag info | |
| 2842 if (m->is_final() ) _number_of_final_methods++; | |
| 2843 if (m->is_static() ) _number_of_static_methods++; | |
| 2844 if (m->is_native() ) _number_of_native_methods++; | |
| 2845 if (m->is_synchronized()) _number_of_synchronized_methods++; | |
| 2846 if (m->method_data() != NULL) _number_of_profiled_methods++; | |
| 2847 // collect parameter size info (add one for receiver, if any) | |
| 2848 _parameter_size_profile[MIN2(m->size_of_parameters() + (m->is_static() ? 0 : 1), max_parameter_size - 1)]++; | |
| 2849 // collect bytecodes info | |
| 2850 { | |
| 2851 Thread *thread = Thread::current(); | |
| 2852 HandleMark hm(thread); | |
| 2853 BytecodeStream s(methodHandle(thread, m)); | |
| 2854 Bytecodes::Code c; | |
| 2855 while ((c = s.next()) >= 0) { | |
| 2856 _number_of_bytecodes++; | |
| 2857 _bytecodes_profile[c]++; | |
| 2858 } | |
| 2859 } | |
| 2860 } | |
| 2861 | |
| 2862 public: | |
| 2863 static void print() { | |
| 2864 initialize(); | |
| 2865 SystemDictionary::methods_do(do_method); | |
| 2866 // generate output | |
| 2867 tty->cr(); | |
| 2868 tty->print_cr("Method statistics (static):"); | |
| 2869 // flag distribution | |
| 2870 tty->cr(); | |
| 2871 tty->print_cr("%6d final methods %6.1f%%", _number_of_final_methods , _number_of_final_methods * 100.0F / _number_of_methods); | |
| 2872 tty->print_cr("%6d static methods %6.1f%%", _number_of_static_methods , _number_of_static_methods * 100.0F / _number_of_methods); | |
| 2873 tty->print_cr("%6d native methods %6.1f%%", _number_of_native_methods , _number_of_native_methods * 100.0F / _number_of_methods); | |
| 2874 tty->print_cr("%6d synchronized methods %6.1f%%", _number_of_synchronized_methods, _number_of_synchronized_methods * 100.0F / _number_of_methods); | |
| 2875 tty->print_cr("%6d profiled methods %6.1f%%", _number_of_profiled_methods, _number_of_profiled_methods * 100.0F / _number_of_methods); | |
| 2876 // parameter size profile | |
| 2877 tty->cr(); | |
| 2878 { int tot = 0; | |
| 2879 int avg = 0; | |
| 2880 for (int i = 0; i < max_parameter_size; i++) { | |
| 2881 int n = _parameter_size_profile[i]; | |
| 2882 tot += n; | |
| 2883 avg += n*i; | |
| 2884 tty->print_cr("parameter size = %1d: %6d methods %5.1f%%", i, n, n * 100.0F / _number_of_methods); | |
| 2885 } | |
| 2886 assert(tot == _number_of_methods, "should be the same"); | |
| 2887 tty->print_cr(" %6d methods 100.0%%", _number_of_methods); | |
| 2888 tty->print_cr("(average parameter size = %3.1f including receiver, if any)", (float)avg / _number_of_methods); | |
| 2889 } | |
| 2890 // bytecodes profile | |
| 2891 tty->cr(); | |
| 2892 { int tot = 0; | |
| 2893 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) { | |
| 2894 if (Bytecodes::is_defined(i)) { | |
| 2895 Bytecodes::Code c = Bytecodes::cast(i); | |
| 2896 int n = _bytecodes_profile[c]; | |
| 2897 tot += n; | |
| 2898 tty->print_cr("%9d %7.3f%% %s", n, n * 100.0F / _number_of_bytecodes, Bytecodes::name(c)); | |
| 2899 } | |
| 2900 } | |
| 2901 assert(tot == _number_of_bytecodes, "should be the same"); | |
| 2902 tty->print_cr("%9d 100.000%%", _number_of_bytecodes); | |
| 2903 } | |
| 2904 tty->cr(); | |
| 2905 } | |
| 2906 }; | |
| 2907 | |
| 2908 int MethodStatistics::_number_of_methods; | |
| 2909 int MethodStatistics::_number_of_final_methods; | |
| 2910 int MethodStatistics::_number_of_static_methods; | |
| 2911 int MethodStatistics::_number_of_native_methods; | |
| 2912 int MethodStatistics::_number_of_synchronized_methods; | |
| 2913 int MethodStatistics::_number_of_profiled_methods; | |
| 2914 int MethodStatistics::_number_of_bytecodes; | |
| 2915 int MethodStatistics::_parameter_size_profile[MethodStatistics::max_parameter_size]; | |
| 2916 int MethodStatistics::_bytecodes_profile[Bytecodes::number_of_java_codes]; | |
| 2917 | |
| 2918 | |
| 2919 void SystemDictionary::print_method_statistics() { | |
| 2920 MethodStatistics::print(); | |
| 2921 } | |
| 2922 | |
| 2923 #endif // PRODUCT |