Mercurial > hg > truffle
annotate src/share/vm/classfile/systemDictionary.cpp @ 6831:d8ce2825b193
8000213: NPG: Should have renamed arrayKlass and typeArrayKlass
Summary: Capitalize these metadata types (and objArrayKlass)
Reviewed-by: stefank, twisti, kvn
| author | coleenp |
|---|---|
| date | Sat, 29 Sep 2012 06:40:00 -0400 |
| parents | 2a48c84f1d04 |
| children | 6e5a59a8e4a7 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
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26 #include "classfile/classLoaderData.inline.hpp" |
| 1972 | 27 #include "classfile/dictionary.hpp" |
| 28 #include "classfile/javaClasses.hpp" | |
| 29 #include "classfile/loaderConstraints.hpp" | |
| 30 #include "classfile/placeholders.hpp" | |
| 31 #include "classfile/resolutionErrors.hpp" | |
| 32 #include "classfile/systemDictionary.hpp" | |
| 33 #include "classfile/vmSymbols.hpp" | |
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34 #include "compiler/compileBroker.hpp" |
| 1972 | 35 #include "interpreter/bytecodeStream.hpp" |
| 36 #include "interpreter/interpreter.hpp" | |
| 37 #include "memory/gcLocker.hpp" | |
| 38 #include "memory/oopFactory.hpp" | |
| 39 #include "oops/instanceKlass.hpp" | |
| 40 #include "oops/instanceRefKlass.hpp" | |
| 41 #include "oops/klass.inline.hpp" | |
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42 #include "oops/methodData.hpp" |
| 1972 | 43 #include "oops/objArrayKlass.hpp" |
| 44 #include "oops/oop.inline.hpp" | |
| 45 #include "oops/oop.inline2.hpp" | |
| 46 #include "oops/typeArrayKlass.hpp" | |
| 47 #include "prims/jvmtiEnvBase.hpp" | |
| 48 #include "prims/methodHandles.hpp" | |
| 49 #include "runtime/biasedLocking.hpp" | |
| 50 #include "runtime/fieldType.hpp" | |
| 51 #include "runtime/handles.inline.hpp" | |
| 52 #include "runtime/java.hpp" | |
| 53 #include "runtime/javaCalls.hpp" | |
| 54 #include "runtime/mutexLocker.hpp" | |
| 55 #include "runtime/signature.hpp" | |
| 56 #include "services/classLoadingService.hpp" | |
| 57 #include "services/threadService.hpp" | |
| 0 | 58 |
| 59 | |
| 1903 | 60 Dictionary* SystemDictionary::_dictionary = NULL; |
| 61 PlaceholderTable* SystemDictionary::_placeholders = NULL; | |
| 62 Dictionary* SystemDictionary::_shared_dictionary = NULL; | |
| 63 LoaderConstraintTable* SystemDictionary::_loader_constraints = NULL; | |
| 64 ResolutionErrorTable* SystemDictionary::_resolution_errors = NULL; | |
| 65 SymbolPropertyTable* SystemDictionary::_invoke_method_table = NULL; | |
| 0 | 66 |
| 67 | |
| 68 int SystemDictionary::_number_of_modifications = 0; | |
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69 int SystemDictionary::_sdgeneration = 0; |
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70 const int SystemDictionary::_primelist[_prime_array_size] = {1009,2017,4049,5051,10103, |
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71 20201,40423,99991}; |
| 0 | 72 |
| 73 oop SystemDictionary::_system_loader_lock_obj = NULL; | |
| 74 | |
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75 Klass* SystemDictionary::_well_known_klasses[SystemDictionary::WKID_LIMIT] |
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76 = { NULL /*, NULL...*/ }; |
| 0 | 77 |
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78 Klass* SystemDictionary::_box_klasses[T_VOID+1] = { NULL /*, NULL...*/ }; |
| 0 | 79 |
| 80 oop SystemDictionary::_java_system_loader = NULL; | |
| 81 | |
| 82 bool SystemDictionary::_has_loadClassInternal = false; | |
| 83 bool SystemDictionary::_has_checkPackageAccess = false; | |
| 84 | |
| 85 // lazily initialized klass variables | |
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86 Klass* volatile SystemDictionary::_abstract_ownable_synchronizer_klass = NULL; |
| 0 | 87 |
| 88 | |
| 89 // ---------------------------------------------------------------------------- | |
| 90 // Java-level SystemLoader | |
| 91 | |
| 92 oop SystemDictionary::java_system_loader() { | |
| 93 return _java_system_loader; | |
| 94 } | |
| 95 | |
| 96 void SystemDictionary::compute_java_system_loader(TRAPS) { | |
| 1142 | 97 KlassHandle system_klass(THREAD, WK_KLASS(ClassLoader_klass)); |
| 0 | 98 JavaValue result(T_OBJECT); |
| 99 JavaCalls::call_static(&result, | |
| 1142 | 100 KlassHandle(THREAD, WK_KLASS(ClassLoader_klass)), |
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101 vmSymbols::getSystemClassLoader_name(), |
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102 vmSymbols::void_classloader_signature(), |
| 0 | 103 CHECK); |
| 104 | |
| 105 _java_system_loader = (oop)result.get_jobject(); | |
| 106 } | |
| 107 | |
| 108 | |
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109 ClassLoaderData* SystemDictionary::register_loader(Handle class_loader) { |
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110 if (class_loader() == NULL) return ClassLoaderData::the_null_class_loader_data(); |
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111 return ClassLoaderDataGraph::find_or_create(class_loader); |
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112 } |
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113 |
| 0 | 114 // ---------------------------------------------------------------------------- |
| 115 // debugging | |
| 116 | |
| 117 #ifdef ASSERT | |
| 118 | |
| 119 // return true if class_name contains no '.' (internal format is '/') | |
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120 bool SystemDictionary::is_internal_format(Symbol* class_name) { |
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121 if (class_name != NULL) { |
| 0 | 122 ResourceMark rm; |
| 123 char* name = class_name->as_C_string(); | |
| 124 return strchr(name, '.') == NULL; | |
| 125 } else { | |
| 126 return true; | |
| 127 } | |
| 128 } | |
| 129 | |
| 130 #endif | |
| 131 | |
| 132 // ---------------------------------------------------------------------------- | |
| 514 | 133 // Parallel class loading check |
| 134 | |
| 135 bool SystemDictionary::is_parallelCapable(Handle class_loader) { | |
| 136 if (UnsyncloadClass || class_loader.is_null()) return true; | |
| 137 if (AlwaysLockClassLoader) return false; | |
| 3938 | 138 return java_lang_ClassLoader::parallelCapable(class_loader()); |
| 514 | 139 } |
| 140 // ---------------------------------------------------------------------------- | |
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141 // ParallelDefineClass flag does not apply to bootclass loader |
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142 bool SystemDictionary::is_parallelDefine(Handle class_loader) { |
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143 if (class_loader.is_null()) return false; |
| 3938 | 144 if (AllowParallelDefineClass && java_lang_ClassLoader::parallelCapable(class_loader())) { |
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145 return true; |
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146 } |
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147 return false; |
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148 } |
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149 // ---------------------------------------------------------------------------- |
| 0 | 150 // Resolving of classes |
| 151 | |
| 152 // Forwards to resolve_or_null | |
| 153 | |
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154 Klass* SystemDictionary::resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS) { |
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155 Klass* klass = resolve_or_null(class_name, class_loader, protection_domain, THREAD); |
| 0 | 156 if (HAS_PENDING_EXCEPTION || klass == NULL) { |
| 157 KlassHandle k_h(THREAD, klass); | |
| 158 // can return a null klass | |
| 159 klass = handle_resolution_exception(class_name, class_loader, protection_domain, throw_error, k_h, THREAD); | |
| 160 } | |
| 161 return klass; | |
| 162 } | |
| 163 | |
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164 Klass* SystemDictionary::handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS) { |
| 0 | 165 if (HAS_PENDING_EXCEPTION) { |
| 166 // If we have a pending exception we forward it to the caller, unless throw_error is true, | |
| 167 // in which case we have to check whether the pending exception is a ClassNotFoundException, | |
| 168 // and if so convert it to a NoClassDefFoundError | |
| 169 // And chain the original ClassNotFoundException | |
| 1142 | 170 if (throw_error && PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass())) { |
| 0 | 171 ResourceMark rm(THREAD); |
| 172 assert(klass_h() == NULL, "Should not have result with exception pending"); | |
| 173 Handle e(THREAD, PENDING_EXCEPTION); | |
| 174 CLEAR_PENDING_EXCEPTION; | |
| 175 THROW_MSG_CAUSE_0(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string(), e); | |
| 176 } else { | |
| 177 return NULL; | |
| 178 } | |
| 179 } | |
| 180 // Class not found, throw appropriate error or exception depending on value of throw_error | |
| 181 if (klass_h() == NULL) { | |
| 182 ResourceMark rm(THREAD); | |
| 183 if (throw_error) { | |
| 184 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string()); | |
| 185 } else { | |
| 186 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), class_name->as_C_string()); | |
| 187 } | |
| 188 } | |
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189 return (Klass*)klass_h(); |
| 0 | 190 } |
| 191 | |
| 192 | |
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193 Klass* SystemDictionary::resolve_or_fail(Symbol* class_name, |
| 0 | 194 bool throw_error, TRAPS) |
| 195 { | |
| 196 return resolve_or_fail(class_name, Handle(), Handle(), throw_error, THREAD); | |
| 197 } | |
| 198 | |
| 199 | |
| 200 // Forwards to resolve_instance_class_or_null | |
| 201 | |
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202 Klass* SystemDictionary::resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS) { |
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203 assert(!THREAD->is_Compiler_thread(), |
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204 err_msg("can not load classes with compiler thread: class=%s, classloader=%s", |
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205 class_name->as_C_string(), |
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206 class_loader.is_null() ? "null" : class_loader->klass()->name()->as_C_string())); |
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207 if (FieldType::is_array(class_name)) { |
| 0 | 208 return resolve_array_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); |
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209 } else if (FieldType::is_obj(class_name)) { |
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210 ResourceMark rm(THREAD); |
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211 // Ignore wrapping L and ;. |
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212 TempNewSymbol name = SymbolTable::new_symbol(class_name->as_C_string() + 1, |
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213 class_name->utf8_length() - 2, CHECK_NULL); |
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214 return resolve_instance_class_or_null(name, class_loader, protection_domain, CHECK_NULL); |
| 0 | 215 } else { |
| 216 return resolve_instance_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); | |
| 217 } | |
| 218 } | |
| 219 | |
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220 Klass* SystemDictionary::resolve_or_null(Symbol* class_name, TRAPS) { |
| 0 | 221 return resolve_or_null(class_name, Handle(), Handle(), THREAD); |
| 222 } | |
| 223 | |
| 224 // Forwards to resolve_instance_class_or_null | |
| 225 | |
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226 Klass* SystemDictionary::resolve_array_class_or_null(Symbol* class_name, |
| 0 | 227 Handle class_loader, |
| 228 Handle protection_domain, | |
| 229 TRAPS) { | |
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230 assert(FieldType::is_array(class_name), "must be array"); |
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231 Klass* k = NULL; |
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232 FieldArrayInfo fd; |
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233 // dimension and object_key in FieldArrayInfo are assigned as a side-effect |
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234 // of this call |
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235 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_NULL); |
| 0 | 236 if (t == T_OBJECT) { |
| 237 // naked oop "k" is OK here -- we assign back into it | |
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238 k = SystemDictionary::resolve_instance_class_or_null(fd.object_key(), |
| 0 | 239 class_loader, |
| 240 protection_domain, | |
| 241 CHECK_NULL); | |
| 242 if (k != NULL) { | |
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243 k = Klass::cast(k)->array_klass(fd.dimension(), CHECK_NULL); |
| 0 | 244 } |
| 245 } else { | |
| 246 k = Universe::typeArrayKlassObj(t); | |
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247 k = TypeArrayKlass::cast(k)->array_klass(fd.dimension(), CHECK_NULL); |
| 0 | 248 } |
| 249 return k; | |
| 250 } | |
| 251 | |
| 252 | |
| 253 // Must be called for any super-class or super-interface resolution | |
| 254 // during class definition to allow class circularity checking | |
| 255 // super-interface callers: | |
| 256 // parse_interfaces - for defineClass & jvmtiRedefineClasses | |
| 257 // super-class callers: | |
| 258 // ClassFileParser - for defineClass & jvmtiRedefineClasses | |
| 259 // load_shared_class - while loading a class from shared archive | |
| 514 | 260 // resolve_instance_class_or_null: |
| 261 // via: handle_parallel_super_load | |
| 0 | 262 // when resolving a class that has an existing placeholder with |
| 263 // a saved superclass [i.e. a defineClass is currently in progress] | |
| 264 // if another thread is trying to resolve the class, it must do | |
| 265 // super-class checks on its own thread to catch class circularity | |
| 266 // This last call is critical in class circularity checking for cases | |
| 267 // where classloading is delegated to different threads and the | |
| 268 // classloader lock is released. | |
| 269 // Take the case: Base->Super->Base | |
| 270 // 1. If thread T1 tries to do a defineClass of class Base | |
| 271 // resolve_super_or_fail creates placeholder: T1, Base (super Super) | |
| 272 // 2. resolve_instance_class_or_null does not find SD or placeholder for Super | |
| 273 // so it tries to load Super | |
| 274 // 3. If we load the class internally, or user classloader uses same thread | |
| 275 // loadClassFromxxx or defineClass via parseClassFile Super ... | |
| 276 // 3.1 resolve_super_or_fail creates placeholder: T1, Super (super Base) | |
| 277 // 3.3 resolve_instance_class_or_null Base, finds placeholder for Base | |
| 278 // 3.4 calls resolve_super_or_fail Base | |
| 279 // 3.5 finds T1,Base -> throws class circularity | |
| 280 //OR 4. If T2 tries to resolve Super via defineClass Super ... | |
| 281 // 4.1 resolve_super_or_fail creates placeholder: T2, Super (super Base) | |
| 282 // 4.2 resolve_instance_class_or_null Base, finds placeholder for Base (super Super) | |
| 283 // 4.3 calls resolve_super_or_fail Super in parallel on own thread T2 | |
| 284 // 4.4 finds T2, Super -> throws class circularity | |
| 285 // Must be called, even if superclass is null, since this is | |
| 286 // where the placeholder entry is created which claims this | |
| 287 // thread is loading this class/classloader. | |
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288 Klass* SystemDictionary::resolve_super_or_fail(Symbol* child_name, |
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289 Symbol* class_name, |
| 0 | 290 Handle class_loader, |
| 291 Handle protection_domain, | |
| 292 bool is_superclass, | |
| 293 TRAPS) { | |
| 294 | |
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295 // Try to get one of the well-known klasses. |
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296 // They are trusted, and do not participate in circularities. |
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297 if (LinkWellKnownClasses) { |
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298 Klass* k = find_well_known_klass(class_name); |
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299 if (k != NULL) { |
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300 return k; |
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301 } |
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302 } |
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303 |
| 0 | 304 // Double-check, if child class is already loaded, just return super-class,interface |
| 305 // Don't add a placedholder if already loaded, i.e. already in system dictionary | |
| 306 // Make sure there's a placeholder for the *child* before resolving. | |
| 307 // Used as a claim that this thread is currently loading superclass/classloader | |
| 308 // Used here for ClassCircularity checks and also for heap verification | |
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309 // (every InstanceKlass in the heap needs to be in the system dictionary |
| 0 | 310 // or have a placeholder). |
| 311 // Must check ClassCircularity before checking if super class is already loaded | |
| 312 // | |
| 313 // We might not already have a placeholder if this child_name was | |
| 314 // first seen via resolve_from_stream (jni_DefineClass or JVM_DefineClass); | |
| 315 // the name of the class might not be known until the stream is actually | |
| 316 // parsed. | |
| 317 // Bugs 4643874, 4715493 | |
| 318 // compute_hash can have a safepoint | |
| 319 | |
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320 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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321 unsigned int d_hash = dictionary()->compute_hash(child_name, loader_data); |
| 0 | 322 int d_index = dictionary()->hash_to_index(d_hash); |
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323 unsigned int p_hash = placeholders()->compute_hash(child_name, loader_data); |
| 0 | 324 int p_index = placeholders()->hash_to_index(p_hash); |
| 325 // can't throw error holding a lock | |
| 326 bool child_already_loaded = false; | |
| 327 bool throw_circularity_error = false; | |
| 328 { | |
| 329 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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330 Klass* childk = find_class(d_index, d_hash, child_name, loader_data); |
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331 Klass* quicksuperk; |
| 0 | 332 // to support // loading: if child done loading, just return superclass |
| 333 // if class_name, & class_loader don't match: | |
| 334 // if initial define, SD update will give LinkageError | |
| 335 // if redefine: compare_class_versions will give HIERARCHY_CHANGED | |
| 336 // so we don't throw an exception here. | |
| 337 // see: nsk redefclass014 & java.lang.instrument Instrument032 | |
| 338 if ((childk != NULL ) && (is_superclass) && | |
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339 ((quicksuperk = InstanceKlass::cast(childk)->super()) != NULL) && |
| 0 | 340 |
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341 ((Klass::cast(quicksuperk)->name() == class_name) && |
| 0 | 342 (Klass::cast(quicksuperk)->class_loader() == class_loader()))) { |
| 343 return quicksuperk; | |
| 344 } else { | |
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345 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, loader_data); |
| 0 | 346 if (probe && probe->check_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER)) { |
| 347 throw_circularity_error = true; | |
| 348 } | |
| 514 | 349 } |
| 350 if (!throw_circularity_error) { | |
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351 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, child_name, loader_data, PlaceholderTable::LOAD_SUPER, class_name, THREAD); |
| 0 | 352 } |
| 353 } | |
| 354 if (throw_circularity_error) { | |
| 355 ResourceMark rm(THREAD); | |
| 356 THROW_MSG_0(vmSymbols::java_lang_ClassCircularityError(), child_name->as_C_string()); | |
| 357 } | |
| 358 | |
| 359 // java.lang.Object should have been found above | |
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360 assert(class_name != NULL, "null super class for resolving"); |
| 0 | 361 // Resolve the super class or interface, check results on return |
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362 Klass* superk = NULL; |
| 0 | 363 superk = SystemDictionary::resolve_or_null(class_name, |
| 364 class_loader, | |
| 365 protection_domain, | |
| 366 THREAD); | |
| 367 | |
| 368 KlassHandle superk_h(THREAD, superk); | |
| 369 | |
| 370 // Note: clean up of placeholders currently in callers of | |
| 371 // resolve_super_or_fail - either at update_dictionary time | |
| 372 // or on error | |
| 373 { | |
| 374 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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375 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, loader_data); |
| 0 | 376 if (probe != NULL) { |
| 377 probe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER); | |
| 378 } | |
| 379 } | |
| 380 if (HAS_PENDING_EXCEPTION || superk_h() == NULL) { | |
| 381 // can null superk | |
| 382 superk_h = KlassHandle(THREAD, handle_resolution_exception(class_name, class_loader, protection_domain, true, superk_h, THREAD)); | |
| 383 } | |
| 384 | |
| 385 return superk_h(); | |
| 386 } | |
| 387 | |
| 388 void SystemDictionary::validate_protection_domain(instanceKlassHandle klass, | |
| 389 Handle class_loader, | |
| 390 Handle protection_domain, | |
| 391 TRAPS) { | |
| 392 if(!has_checkPackageAccess()) return; | |
| 393 | |
| 394 // Now we have to call back to java to check if the initating class has access | |
| 395 JavaValue result(T_VOID); | |
| 396 if (TraceProtectionDomainVerification) { | |
| 397 // Print out trace information | |
| 398 tty->print_cr("Checking package access"); | |
| 399 tty->print(" - class loader: "); class_loader()->print_value_on(tty); tty->cr(); | |
| 400 tty->print(" - protection domain: "); protection_domain()->print_value_on(tty); tty->cr(); | |
| 401 tty->print(" - loading: "); klass()->print_value_on(tty); tty->cr(); | |
| 402 } | |
| 403 | |
| 1142 | 404 KlassHandle system_loader(THREAD, SystemDictionary::ClassLoader_klass()); |
| 0 | 405 JavaCalls::call_special(&result, |
| 406 class_loader, | |
| 407 system_loader, | |
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408 vmSymbols::checkPackageAccess_name(), |
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409 vmSymbols::class_protectiondomain_signature(), |
| 0 | 410 Handle(THREAD, klass->java_mirror()), |
| 411 protection_domain, | |
| 412 THREAD); | |
| 413 | |
| 414 if (TraceProtectionDomainVerification) { | |
| 415 if (HAS_PENDING_EXCEPTION) { | |
| 416 tty->print_cr(" -> DENIED !!!!!!!!!!!!!!!!!!!!!"); | |
| 417 } else { | |
| 418 tty->print_cr(" -> granted"); | |
| 419 } | |
| 420 tty->cr(); | |
| 421 } | |
| 422 | |
| 423 if (HAS_PENDING_EXCEPTION) return; | |
| 424 | |
| 425 // If no exception has been thrown, we have validated the protection domain | |
| 426 // Insert the protection domain of the initiating class into the set. | |
| 427 { | |
| 428 // We recalculate the entry here -- we've called out to java since | |
| 429 // the last time it was calculated. | |
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430 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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431 |
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432 Symbol* kn = klass->name(); |
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433 unsigned int d_hash = dictionary()->compute_hash(kn, loader_data); |
| 0 | 434 int d_index = dictionary()->hash_to_index(d_hash); |
| 435 | |
| 436 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 437 { | |
| 438 // Note that we have an entry, and entries can be deleted only during GC, | |
| 439 // so we cannot allow GC to occur while we're holding this entry. | |
| 440 | |
| 441 // We're using a No_Safepoint_Verifier to catch any place where we | |
| 442 // might potentially do a GC at all. | |
| 443 // SystemDictionary::do_unloading() asserts that classes are only | |
| 444 // unloaded at a safepoint. | |
| 445 No_Safepoint_Verifier nosafepoint; | |
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446 dictionary()->add_protection_domain(d_index, d_hash, klass, loader_data, |
| 0 | 447 protection_domain, THREAD); |
| 448 } | |
| 449 } | |
| 450 } | |
| 451 | |
| 452 // We only get here if this thread finds that another thread | |
| 453 // has already claimed the placeholder token for the current operation, | |
| 454 // but that other thread either never owned or gave up the | |
| 455 // object lock | |
| 456 // Waits on SystemDictionary_lock to indicate placeholder table updated | |
| 457 // On return, caller must recheck placeholder table state | |
| 458 // | |
| 459 // We only get here if | |
| 460 // 1) custom classLoader, i.e. not bootstrap classloader | |
| 461 // 2) UnsyncloadClass not set | |
| 462 // 3) custom classLoader has broken the class loader objectLock | |
| 463 // so another thread got here in parallel | |
| 464 // | |
| 465 // lockObject must be held. | |
| 466 // Complicated dance due to lock ordering: | |
| 467 // Must first release the classloader object lock to | |
| 468 // allow initial definer to complete the class definition | |
| 469 // and to avoid deadlock | |
| 470 // Reclaim classloader lock object with same original recursion count | |
| 471 // Must release SystemDictionary_lock after notify, since | |
| 472 // class loader lock must be claimed before SystemDictionary_lock | |
| 473 // to prevent deadlocks | |
| 474 // | |
| 475 // The notify allows applications that did an untimed wait() on | |
| 476 // the classloader object lock to not hang. | |
| 477 void SystemDictionary::double_lock_wait(Handle lockObject, TRAPS) { | |
| 478 assert_lock_strong(SystemDictionary_lock); | |
| 479 | |
| 480 bool calledholdinglock | |
| 481 = ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, lockObject); | |
| 482 assert(calledholdinglock,"must hold lock for notify"); | |
| 514 | 483 assert((!(lockObject() == _system_loader_lock_obj) && !is_parallelCapable(lockObject)), "unexpected double_lock_wait"); |
| 0 | 484 ObjectSynchronizer::notifyall(lockObject, THREAD); |
| 485 intptr_t recursions = ObjectSynchronizer::complete_exit(lockObject, THREAD); | |
| 486 SystemDictionary_lock->wait(); | |
| 487 SystemDictionary_lock->unlock(); | |
| 488 ObjectSynchronizer::reenter(lockObject, recursions, THREAD); | |
| 489 SystemDictionary_lock->lock(); | |
| 490 } | |
| 491 | |
| 492 // If the class in is in the placeholder table, class loading is in progress | |
| 493 // For cases where the application changes threads to load classes, it | |
| 494 // is critical to ClassCircularity detection that we try loading | |
| 495 // the superclass on the same thread internally, so we do parallel | |
| 496 // super class loading here. | |
| 497 // This also is critical in cases where the original thread gets stalled | |
| 498 // even in non-circularity situations. | |
| 499 // Note: only one thread can define the class, but multiple can resolve | |
| 500 // Note: must call resolve_super_or_fail even if null super - | |
| 514 | 501 // to force placeholder entry creation for this class for circularity detection |
| 0 | 502 // Caller must check for pending exception |
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503 // Returns non-null Klass* if other thread has completed load |
| 0 | 504 // and we are done, |
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505 // If return null Klass* and no pending exception, the caller must load the class |
| 0 | 506 instanceKlassHandle SystemDictionary::handle_parallel_super_load( |
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507 Symbol* name, Symbol* superclassname, Handle class_loader, |
| 0 | 508 Handle protection_domain, Handle lockObject, TRAPS) { |
| 509 | |
| 510 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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511 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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512 unsigned int d_hash = dictionary()->compute_hash(name, loader_data); |
| 0 | 513 int d_index = dictionary()->hash_to_index(d_hash); |
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514 unsigned int p_hash = placeholders()->compute_hash(name, loader_data); |
| 0 | 515 int p_index = placeholders()->hash_to_index(p_hash); |
| 516 | |
| 517 // superk is not used, resolve_super called for circularity check only | |
| 518 // This code is reached in two situations. One if this thread | |
| 519 // is loading the same class twice (e.g. ClassCircularity, or | |
| 520 // java.lang.instrument). | |
| 521 // The second is if another thread started the resolve_super first | |
| 522 // and has not yet finished. | |
| 523 // In both cases the original caller will clean up the placeholder | |
| 524 // entry on error. | |
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525 Klass* superk = SystemDictionary::resolve_super_or_fail(name, |
| 0 | 526 superclassname, |
| 527 class_loader, | |
| 528 protection_domain, | |
| 529 true, | |
| 530 CHECK_(nh)); | |
| 531 // We don't redefine the class, so we just need to clean up if there | |
| 532 // was not an error (don't want to modify any system dictionary | |
| 533 // data structures). | |
| 534 { | |
| 535 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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536 placeholders()->find_and_remove(p_index, p_hash, name, loader_data, THREAD); |
| 0 | 537 SystemDictionary_lock->notify_all(); |
| 538 } | |
| 539 | |
| 514 | 540 // parallelCapable class loaders do NOT wait for parallel superclass loads to complete |
| 541 // Serial class loaders and bootstrap classloader do wait for superclass loads | |
| 542 if (!class_loader.is_null() && is_parallelCapable(class_loader)) { | |
| 0 | 543 MutexLocker mu(SystemDictionary_lock, THREAD); |
| 544 // Check if classloading completed while we were loading superclass or waiting | |
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545 Klass* check = find_class(d_index, d_hash, name, loader_data); |
| 0 | 546 if (check != NULL) { |
| 547 // Klass is already loaded, so just return it | |
| 548 return(instanceKlassHandle(THREAD, check)); | |
| 549 } else { | |
| 550 return nh; | |
| 551 } | |
| 552 } | |
| 553 | |
| 554 // must loop to both handle other placeholder updates | |
| 555 // and spurious notifications | |
| 556 bool super_load_in_progress = true; | |
| 557 PlaceholderEntry* placeholder; | |
| 558 while (super_load_in_progress) { | |
| 559 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 560 // Check if classloading completed while we were loading superclass or waiting | |
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561 Klass* check = find_class(d_index, d_hash, name, loader_data); |
| 0 | 562 if (check != NULL) { |
| 563 // Klass is already loaded, so just return it | |
| 564 return(instanceKlassHandle(THREAD, check)); | |
| 565 } else { | |
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566 placeholder = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
| 0 | 567 if (placeholder && placeholder->super_load_in_progress() ){ |
| 568 // Before UnsyncloadClass: | |
| 569 // We only get here if the application has released the | |
| 570 // classloader lock when another thread was in the middle of loading a | |
| 571 // superclass/superinterface for this class, and now | |
| 572 // this thread is also trying to load this class. | |
| 573 // To minimize surprises, the first thread that started to | |
| 574 // load a class should be the one to complete the loading | |
| 575 // with the classfile it initially expected. | |
| 576 // This logic has the current thread wait once it has done | |
| 577 // all the superclass/superinterface loading it can, until | |
| 578 // the original thread completes the class loading or fails | |
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579 // If it completes we will use the resulting InstanceKlass |
| 0 | 580 // which we will find below in the systemDictionary. |
| 581 // We also get here for parallel bootstrap classloader | |
| 582 if (class_loader.is_null()) { | |
| 583 SystemDictionary_lock->wait(); | |
| 584 } else { | |
| 585 double_lock_wait(lockObject, THREAD); | |
| 586 } | |
| 587 } else { | |
| 588 // If not in SD and not in PH, other thread's load must have failed | |
| 589 super_load_in_progress = false; | |
| 590 } | |
| 591 } | |
| 592 } | |
| 593 return (nh); | |
| 594 } | |
| 595 | |
| 596 | |
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597 Klass* SystemDictionary::resolve_instance_class_or_null(Symbol* name, Handle class_loader, Handle protection_domain, TRAPS) { |
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598 assert(name != NULL && !FieldType::is_array(name) && |
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599 !FieldType::is_obj(name), "invalid class name"); |
| 0 | 600 |
| 601 // UseNewReflection | |
| 602 // Fix for 4474172; see evaluation for more details | |
| 603 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); | |
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604 ClassLoaderData *loader_data = register_loader(class_loader); |
| 0 | 605 |
| 606 // Do lookup to see if class already exist and the protection domain | |
| 607 // has the right access | |
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608 unsigned int d_hash = dictionary()->compute_hash(name, loader_data); |
| 0 | 609 int d_index = dictionary()->hash_to_index(d_hash); |
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610 Klass* probe = dictionary()->find(d_index, d_hash, name, loader_data, |
| 0 | 611 protection_domain, THREAD); |
| 612 if (probe != NULL) return probe; | |
| 613 | |
| 614 | |
| 615 // Non-bootstrap class loaders will call out to class loader and | |
| 616 // define via jvm/jni_DefineClass which will acquire the | |
| 617 // class loader object lock to protect against multiple threads | |
| 618 // defining the class in parallel by accident. | |
| 619 // This lock must be acquired here so the waiter will find | |
| 620 // any successful result in the SystemDictionary and not attempt | |
| 621 // the define | |
| 514 | 622 // ParallelCapable Classloaders and the bootstrap classloader, |
| 0 | 623 // or all classloaders with UnsyncloadClass do not acquire lock here |
| 624 bool DoObjectLock = true; | |
| 514 | 625 if (is_parallelCapable(class_loader)) { |
| 0 | 626 DoObjectLock = false; |
| 627 } | |
| 628 | |
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629 unsigned int p_hash = placeholders()->compute_hash(name, loader_data); |
| 0 | 630 int p_index = placeholders()->hash_to_index(p_hash); |
| 631 | |
| 632 // Class is not in SystemDictionary so we have to do loading. | |
| 633 // Make sure we are synchronized on the class loader before we proceed | |
| 634 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
| 635 check_loader_lock_contention(lockObject, THREAD); | |
| 636 ObjectLocker ol(lockObject, THREAD, DoObjectLock); | |
| 637 | |
| 638 // Check again (after locking) if class already exist in SystemDictionary | |
| 639 bool class_has_been_loaded = false; | |
| 640 bool super_load_in_progress = false; | |
| 641 bool havesupername = false; | |
| 642 instanceKlassHandle k; | |
| 643 PlaceholderEntry* placeholder; | |
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644 Symbol* superclassname = NULL; |
| 0 | 645 |
| 646 { | |
| 647 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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648 Klass* check = find_class(d_index, d_hash, name, loader_data); |
| 0 | 649 if (check != NULL) { |
| 650 // Klass is already loaded, so just return it | |
| 651 class_has_been_loaded = true; | |
| 652 k = instanceKlassHandle(THREAD, check); | |
| 653 } else { | |
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654 placeholder = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
| 0 | 655 if (placeholder && placeholder->super_load_in_progress()) { |
| 656 super_load_in_progress = true; | |
| 657 if (placeholder->havesupername() == true) { | |
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658 superclassname = placeholder->supername(); |
| 0 | 659 havesupername = true; |
| 660 } | |
| 661 } | |
| 662 } | |
| 663 } | |
| 664 | |
| 665 // If the class in is in the placeholder table, class loading is in progress | |
| 666 if (super_load_in_progress && havesupername==true) { | |
| 667 k = SystemDictionary::handle_parallel_super_load(name, superclassname, | |
| 668 class_loader, protection_domain, lockObject, THREAD); | |
| 669 if (HAS_PENDING_EXCEPTION) { | |
| 670 return NULL; | |
| 671 } | |
| 672 if (!k.is_null()) { | |
| 673 class_has_been_loaded = true; | |
| 674 } | |
| 675 } | |
| 676 | |
| 677 if (!class_has_been_loaded) { | |
| 678 | |
| 679 // add placeholder entry to record loading instance class | |
| 680 // Five cases: | |
| 681 // All cases need to prevent modifying bootclasssearchpath | |
| 682 // in parallel with a classload of same classname | |
| 514 | 683 // Redefineclasses uses existence of the placeholder for the duration |
| 684 // of the class load to prevent concurrent redefinition of not completely | |
| 685 // defined classes. | |
| 0 | 686 // case 1. traditional classloaders that rely on the classloader object lock |
| 687 // - no other need for LOAD_INSTANCE | |
| 688 // case 2. traditional classloaders that break the classloader object lock | |
| 689 // as a deadlock workaround. Detection of this case requires that | |
| 690 // this check is done while holding the classloader object lock, | |
| 691 // and that lock is still held when calling classloader's loadClass. | |
| 692 // For these classloaders, we ensure that the first requestor | |
| 693 // completes the load and other requestors wait for completion. | |
| 694 // case 3. UnsyncloadClass - don't use objectLocker | |
| 695 // With this flag, we allow parallel classloading of a | |
| 696 // class/classloader pair | |
| 697 // case4. Bootstrap classloader - don't own objectLocker | |
| 698 // This classloader supports parallelism at the classloader level, | |
| 699 // but only allows a single load of a class/classloader pair. | |
| 700 // No performance benefit and no deadlock issues. | |
| 514 | 701 // case 5. parallelCapable user level classloaders - without objectLocker |
| 702 // Allow parallel classloading of a class/classloader pair | |
| 0 | 703 bool throw_circularity_error = false; |
| 704 { | |
| 705 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 514 | 706 if (class_loader.is_null() || !is_parallelCapable(class_loader)) { |
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707 PlaceholderEntry* oldprobe = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
| 0 | 708 if (oldprobe) { |
| 709 // only need check_seen_thread once, not on each loop | |
| 710 // 6341374 java/lang/Instrument with -Xcomp | |
| 711 if (oldprobe->check_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE)) { | |
| 712 throw_circularity_error = true; | |
| 713 } else { | |
| 714 // case 1: traditional: should never see load_in_progress. | |
| 715 while (!class_has_been_loaded && oldprobe && oldprobe->instance_load_in_progress()) { | |
| 716 | |
| 717 // case 4: bootstrap classloader: prevent futile classloading, | |
| 718 // wait on first requestor | |
| 719 if (class_loader.is_null()) { | |
| 720 SystemDictionary_lock->wait(); | |
| 721 } else { | |
| 722 // case 2: traditional with broken classloader lock. wait on first | |
| 723 // requestor. | |
| 724 double_lock_wait(lockObject, THREAD); | |
| 725 } | |
| 726 // Check if classloading completed while we were waiting | |
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727 Klass* check = find_class(d_index, d_hash, name, loader_data); |
| 0 | 728 if (check != NULL) { |
| 729 // Klass is already loaded, so just return it | |
| 730 k = instanceKlassHandle(THREAD, check); | |
| 731 class_has_been_loaded = true; | |
| 732 } | |
| 733 // check if other thread failed to load and cleaned up | |
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734 oldprobe = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
| 0 | 735 } |
| 736 } | |
| 737 } | |
| 738 } | |
| 739 // All cases: add LOAD_INSTANCE | |
| 514 | 740 // case 3: UnsyncloadClass || case 5: parallelCapable: allow competing threads to try |
| 0 | 741 // LOAD_INSTANCE in parallel |
| 742 // add placeholder entry even if error - callers will remove on error | |
| 514 | 743 if (!throw_circularity_error && !class_has_been_loaded) { |
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744 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, name, loader_data, PlaceholderTable::LOAD_INSTANCE, NULL, THREAD); |
| 0 | 745 // For class loaders that do not acquire the classloader object lock, |
| 746 // if they did not catch another thread holding LOAD_INSTANCE, | |
| 747 // need a check analogous to the acquire ObjectLocker/find_class | |
| 748 // i.e. now that we hold the LOAD_INSTANCE token on loading this class/CL | |
| 749 // one final check if the load has already completed | |
| 514 | 750 // class loaders holding the ObjectLock shouldn't find the class here |
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751 Klass* check = find_class(d_index, d_hash, name, loader_data); |
| 0 | 752 if (check != NULL) { |
| 753 // Klass is already loaded, so just return it | |
| 754 k = instanceKlassHandle(THREAD, check); | |
| 755 class_has_been_loaded = true; | |
| 756 newprobe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE); | |
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757 placeholders()->find_and_remove(p_index, p_hash, name, loader_data, THREAD); |
| 514 | 758 SystemDictionary_lock->notify_all(); |
| 0 | 759 } |
| 760 } | |
| 761 } | |
| 762 // must throw error outside of owning lock | |
| 763 if (throw_circularity_error) { | |
| 764 ResourceMark rm(THREAD); | |
| 765 THROW_MSG_0(vmSymbols::java_lang_ClassCircularityError(), name->as_C_string()); | |
| 766 } | |
| 767 | |
| 768 if (!class_has_been_loaded) { | |
| 769 | |
| 770 // Do actual loading | |
| 771 k = load_instance_class(name, class_loader, THREAD); | |
| 772 | |
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773 // For UnsyncloadClass only |
| 0 | 774 // If they got a linkageError, check if a parallel class load succeeded. |
| 775 // If it did, then for bytecode resolution the specification requires | |
| 776 // that we return the same result we did for the other thread, i.e. the | |
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777 // successfully loaded InstanceKlass |
| 0 | 778 // Should not get here for classloaders that support parallelism |
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779 // with the new cleaner mechanism, even with AllowParallelDefineClass |
| 514 | 780 // Bootstrap goes through here to allow for an extra guarantee check |
| 0 | 781 if (UnsyncloadClass || (class_loader.is_null())) { |
| 782 if (k.is_null() && HAS_PENDING_EXCEPTION | |
| 1142 | 783 && PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { |
| 0 | 784 MutexLocker mu(SystemDictionary_lock, THREAD); |
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785 Klass* check = find_class(d_index, d_hash, name, loader_data); |
| 0 | 786 if (check != NULL) { |
| 787 // Klass is already loaded, so just use it | |
| 788 k = instanceKlassHandle(THREAD, check); | |
| 789 CLEAR_PENDING_EXCEPTION; | |
| 790 guarantee((!class_loader.is_null()), "dup definition for bootstrap loader?"); | |
| 791 } | |
| 792 } | |
| 793 } | |
| 794 | |
| 795 // clean up placeholder entries for success or error | |
| 796 // This cleans up LOAD_INSTANCE entries | |
| 797 // It also cleans up LOAD_SUPER entries on errors from | |
| 798 // calling load_instance_class | |
| 799 { | |
| 800 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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801 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
| 0 | 802 if (probe != NULL) { |
| 803 probe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE); | |
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804 placeholders()->find_and_remove(p_index, p_hash, name, loader_data, THREAD); |
| 0 | 805 SystemDictionary_lock->notify_all(); |
| 806 } | |
| 807 } | |
| 808 | |
| 809 // If everything was OK (no exceptions, no null return value), and | |
| 810 // class_loader is NOT the defining loader, do a little more bookkeeping. | |
| 811 if (!HAS_PENDING_EXCEPTION && !k.is_null() && | |
| 812 k->class_loader() != class_loader()) { | |
| 813 | |
| 814 check_constraints(d_index, d_hash, k, class_loader, false, THREAD); | |
| 815 | |
| 816 // Need to check for a PENDING_EXCEPTION again; check_constraints | |
| 817 // can throw and doesn't use the CHECK macro. | |
| 818 if (!HAS_PENDING_EXCEPTION) { | |
| 819 { // Grabbing the Compile_lock prevents systemDictionary updates | |
| 820 // during compilations. | |
| 821 MutexLocker mu(Compile_lock, THREAD); | |
| 822 update_dictionary(d_index, d_hash, p_index, p_hash, | |
| 823 k, class_loader, THREAD); | |
| 824 } | |
| 825 if (JvmtiExport::should_post_class_load()) { | |
| 826 Thread *thread = THREAD; | |
| 827 assert(thread->is_Java_thread(), "thread->is_Java_thread()"); | |
| 828 JvmtiExport::post_class_load((JavaThread *) thread, k()); | |
| 829 } | |
| 830 } | |
| 831 } | |
| 832 if (HAS_PENDING_EXCEPTION || k.is_null()) { | |
| 833 // On error, clean up placeholders | |
| 834 { | |
| 835 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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836 placeholders()->find_and_remove(p_index, p_hash, name, loader_data, THREAD); |
| 0 | 837 SystemDictionary_lock->notify_all(); |
| 838 } | |
| 839 return NULL; | |
| 840 } | |
| 841 } | |
| 842 } | |
| 843 | |
| 844 #ifdef ASSERT | |
| 845 { | |
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846 ClassLoaderData* loader_data = k->class_loader_data(); |
| 0 | 847 MutexLocker mu(SystemDictionary_lock, THREAD); |
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848 Klass* kk = find_class(name, loader_data); |
| 0 | 849 assert(kk == k(), "should be present in dictionary"); |
| 850 } | |
| 851 #endif | |
| 852 | |
| 853 // return if the protection domain in NULL | |
| 854 if (protection_domain() == NULL) return k(); | |
| 855 | |
| 856 // Check the protection domain has the right access | |
| 857 { | |
| 858 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 859 // Note that we have an entry, and entries can be deleted only during GC, | |
| 860 // so we cannot allow GC to occur while we're holding this entry. | |
| 861 // We're using a No_Safepoint_Verifier to catch any place where we | |
| 862 // might potentially do a GC at all. | |
| 863 // SystemDictionary::do_unloading() asserts that classes are only | |
| 864 // unloaded at a safepoint. | |
| 865 No_Safepoint_Verifier nosafepoint; | |
| 866 if (dictionary()->is_valid_protection_domain(d_index, d_hash, name, | |
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867 loader_data, |
| 0 | 868 protection_domain)) { |
| 869 return k(); | |
| 870 } | |
| 871 } | |
| 872 | |
| 873 // Verify protection domain. If it fails an exception is thrown | |
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874 validate_protection_domain(k, class_loader, protection_domain, CHECK_NULL); |
| 0 | 875 |
| 876 return k(); | |
| 877 } | |
| 878 | |
| 879 | |
| 880 // This routine does not lock the system dictionary. | |
| 881 // | |
| 882 // Since readers don't hold a lock, we must make sure that system | |
| 883 // dictionary entries are only removed at a safepoint (when only one | |
| 884 // thread is running), and are added to in a safe way (all links must | |
| 885 // be updated in an MT-safe manner). | |
| 886 // | |
| 887 // Callers should be aware that an entry could be added just after | |
| 888 // _dictionary->bucket(index) is read here, so the caller will not see | |
| 889 // the new entry. | |
| 890 | |
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891 Klass* SystemDictionary::find(Symbol* class_name, |
| 0 | 892 Handle class_loader, |
| 893 Handle protection_domain, | |
| 894 TRAPS) { | |
| 895 | |
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896 // UseNewReflection |
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897 // The result of this call should be consistent with the result |
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898 // of the call to resolve_instance_class_or_null(). |
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899 // See evaluation 6790209 and 4474172 for more details. |
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900 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); |
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901 ClassLoaderData* loader_data = register_loader(class_loader); |
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902 |
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903 unsigned int d_hash = dictionary()->compute_hash(class_name, loader_data); |
| 0 | 904 int d_index = dictionary()->hash_to_index(d_hash); |
| 905 | |
| 906 { | |
| 907 // Note that we have an entry, and entries can be deleted only during GC, | |
| 908 // so we cannot allow GC to occur while we're holding this entry. | |
| 909 // We're using a No_Safepoint_Verifier to catch any place where we | |
| 910 // might potentially do a GC at all. | |
| 911 // SystemDictionary::do_unloading() asserts that classes are only | |
| 912 // unloaded at a safepoint. | |
| 913 No_Safepoint_Verifier nosafepoint; | |
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914 return dictionary()->find(d_index, d_hash, class_name, loader_data, |
| 0 | 915 protection_domain, THREAD); |
| 916 } | |
| 917 } | |
| 918 | |
| 919 | |
| 920 // Look for a loaded instance or array klass by name. Do not do any loading. | |
| 921 // return NULL in case of error. | |
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922 Klass* SystemDictionary::find_instance_or_array_klass(Symbol* class_name, |
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923 Handle class_loader, |
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924 Handle protection_domain, |
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925 TRAPS) { |
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926 Klass* k = NULL; |
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927 assert(class_name != NULL, "class name must be non NULL"); |
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928 |
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929 // Try to get one of the well-known klasses. |
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930 if (LinkWellKnownClasses) { |
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931 k = find_well_known_klass(class_name); |
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932 if (k != NULL) { |
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933 return k; |
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934 } |
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935 } |
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936 |
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937 if (FieldType::is_array(class_name)) { |
| 0 | 938 // The name refers to an array. Parse the name. |
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939 // dimension and object_key in FieldArrayInfo are assigned as a |
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940 // side-effect of this call |
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941 FieldArrayInfo fd; |
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942 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
| 0 | 943 if (t != T_OBJECT) { |
| 944 k = Universe::typeArrayKlassObj(t); | |
| 945 } else { | |
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946 k = SystemDictionary::find(fd.object_key(), class_loader, protection_domain, THREAD); |
| 0 | 947 } |
| 948 if (k != NULL) { | |
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949 k = Klass::cast(k)->array_klass_or_null(fd.dimension()); |
| 0 | 950 } |
| 951 } else { | |
| 952 k = find(class_name, class_loader, protection_domain, THREAD); | |
| 953 } | |
| 954 return k; | |
| 955 } | |
| 956 | |
|
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957 // Quick range check for names of well-known classes: |
|
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958 static Symbol* wk_klass_name_limits[2] = {NULL, NULL}; |
|
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959 |
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960 #ifndef PRODUCT |
|
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961 static int find_wkk_calls, find_wkk_probes, find_wkk_wins; |
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962 // counts for "hello world": 3983, 1616, 1075 |
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963 // => 60% hit after limit guard, 25% total win rate |
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964 #endif |
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965 |
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966 Klass* SystemDictionary::find_well_known_klass(Symbol* class_name) { |
|
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967 // A bounds-check on class_name will quickly get a negative result. |
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968 NOT_PRODUCT(find_wkk_calls++); |
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969 if (class_name >= wk_klass_name_limits[0] && |
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970 class_name <= wk_klass_name_limits[1]) { |
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971 NOT_PRODUCT(find_wkk_probes++); |
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972 vmSymbols::SID sid = vmSymbols::find_sid(class_name); |
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973 if (sid != vmSymbols::NO_SID) { |
|
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974 Klass* k = NULL; |
|
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975 switch (sid) { |
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976 #define WK_KLASS_CASE(name, symbol, ignore_option) \ |
|
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977 case vmSymbols::VM_SYMBOL_ENUM_NAME(symbol): \ |
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978 k = WK_KLASS(name); break; |
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979 WK_KLASSES_DO(WK_KLASS_CASE) |
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980 #undef WK_KLASS_CASE |
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981 } |
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982 NOT_PRODUCT(if (k != NULL) find_wkk_wins++); |
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983 return k; |
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984 } |
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985 } |
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986 return NULL; |
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987 } |
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988 |
| 0 | 989 // Note: this method is much like resolve_from_stream, but |
| 990 // updates no supplemental data structures. | |
| 991 // TODO consolidate the two methods with a helper routine? | |
|
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992 Klass* SystemDictionary::parse_stream(Symbol* class_name, |
|
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993 Handle class_loader, |
|
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994 Handle protection_domain, |
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995 ClassFileStream* st, |
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996 KlassHandle host_klass, |
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997 GrowableArray<Handle>* cp_patches, |
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998 TRAPS) { |
|
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999 TempNewSymbol parsed_name = NULL; |
| 0 | 1000 |
| 1001 // Parse the stream. Note that we do this even though this klass might | |
| 1002 // already be present in the SystemDictionary, otherwise we would not | |
| 1003 // throw potential ClassFormatErrors. | |
| 1004 // | |
| 1005 // Note: "name" is updated. | |
| 1006 // Further note: a placeholder will be added for this class when | |
| 1007 // super classes are loaded (resolve_super_or_fail). We expect this | |
| 1008 // to be called for all classes but java.lang.Object; and we preload | |
| 1009 // java.lang.Object through resolve_or_fail, not this path. | |
| 1010 | |
| 1011 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
| 1012 class_loader, | |
| 1013 protection_domain, | |
| 710 | 1014 host_klass, |
| 1015 cp_patches, | |
| 0 | 1016 parsed_name, |
|
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1017 true, |
| 0 | 1018 THREAD); |
| 1019 | |
| 1020 // We don't redefine the class, so we just need to clean up whether there | |
| 1021 // was an error or not (don't want to modify any system dictionary | |
| 1022 // data structures). | |
| 1023 // Parsed name could be null if we threw an error before we got far | |
| 1024 // enough along to parse it -- in that case, there is nothing to clean up. | |
|
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1025 if (parsed_name != NULL) { |
|
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1026 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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1027 |
| 0 | 1028 unsigned int p_hash = placeholders()->compute_hash(parsed_name, |
|
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1029 loader_data); |
| 0 | 1030 int p_index = placeholders()->hash_to_index(p_hash); |
| 1031 { | |
| 1032 MutexLocker mu(SystemDictionary_lock, THREAD); | |
|
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1033 placeholders()->find_and_remove(p_index, p_hash, parsed_name, loader_data, THREAD); |
| 0 | 1034 SystemDictionary_lock->notify_all(); |
| 1035 } | |
| 1036 } | |
| 1037 | |
|
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1038 if (host_klass.not_null() && k.not_null()) { |
|
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1039 assert(EnableInvokeDynamic, ""); |
|
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1040 // If it's anonymous, initialize it now, since nobody else will. |
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1041 k->class_loader_data()->record_dependency(host_klass(), CHECK_NULL); |
|
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1042 k->set_host_klass(host_klass()); |
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1043 |
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1044 { |
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1045 MutexLocker mu_r(Compile_lock, THREAD); |
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1046 |
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1047 // Add to class hierarchy, initialize vtables, and do possible |
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1048 // deoptimizations. |
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1049 add_to_hierarchy(k, CHECK_NULL); // No exception, but can block |
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1050 |
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1051 // But, do not add to system dictionary. |
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1052 } |
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1053 |
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1054 // Rewrite and patch constant pool here. |
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1055 k->link_class(THREAD); |
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1056 if (cp_patches != NULL) { |
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1057 k->constants()->patch_resolved_references(cp_patches); |
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1058 } |
|
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1059 k->eager_initialize(THREAD); |
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1060 |
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1061 // notify jvmti |
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1062 if (JvmtiExport::should_post_class_load()) { |
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1063 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); |
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1064 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); |
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1065 } |
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1066 } |
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1067 assert(host_klass.not_null() || cp_patches == NULL, |
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1068 "cp_patches only found with host_klass"); |
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1069 |
| 0 | 1070 return k(); |
| 1071 } | |
| 1072 | |
| 1073 // Add a klass to the system from a stream (called by jni_DefineClass and | |
| 1074 // JVM_DefineClass). | |
| 1075 // Note: class_name can be NULL. In that case we do not know the name of | |
| 1076 // the class until we have parsed the stream. | |
| 1077 | |
|
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1078 Klass* SystemDictionary::resolve_from_stream(Symbol* class_name, |
|
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1079 Handle class_loader, |
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1080 Handle protection_domain, |
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1081 ClassFileStream* st, |
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1082 bool verify, |
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1083 TRAPS) { |
| 0 | 1084 |
| 514 | 1085 // Classloaders that support parallelism, e.g. bootstrap classloader, |
| 1086 // or all classloaders with UnsyncloadClass do not acquire lock here | |
| 1087 bool DoObjectLock = true; | |
| 1088 if (is_parallelCapable(class_loader)) { | |
| 1089 DoObjectLock = false; | |
| 1090 } | |
| 1091 | |
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1092 ClassLoaderData* loader_data = register_loader(class_loader); |
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1093 |
| 514 | 1094 // Make sure we are synchronized on the class loader before we proceed |
| 0 | 1095 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); |
| 1096 check_loader_lock_contention(lockObject, THREAD); | |
| 514 | 1097 ObjectLocker ol(lockObject, THREAD, DoObjectLock); |
| 0 | 1098 |
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1099 TempNewSymbol parsed_name = NULL; |
| 0 | 1100 |
| 1101 // Parse the stream. Note that we do this even though this klass might | |
| 1102 // already be present in the SystemDictionary, otherwise we would not | |
| 1103 // throw potential ClassFormatErrors. | |
| 1104 // | |
| 1105 // Note: "name" is updated. | |
| 1106 // Further note: a placeholder will be added for this class when | |
| 1107 // super classes are loaded (resolve_super_or_fail). We expect this | |
| 1108 // to be called for all classes but java.lang.Object; and we preload | |
| 1109 // java.lang.Object through resolve_or_fail, not this path. | |
| 1110 | |
| 1111 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
| 1112 class_loader, | |
| 1113 protection_domain, | |
| 1114 parsed_name, | |
|
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1115 verify, |
| 0 | 1116 THREAD); |
| 1117 | |
| 1118 const char* pkg = "java/"; | |
| 1119 if (!HAS_PENDING_EXCEPTION && | |
| 1120 !class_loader.is_null() && | |
|
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1121 parsed_name != NULL && |
| 0 | 1122 !strncmp((const char*)parsed_name->bytes(), pkg, strlen(pkg))) { |
| 1123 // It is illegal to define classes in the "java." package from | |
| 1124 // JVM_DefineClass or jni_DefineClass unless you're the bootclassloader | |
| 1125 ResourceMark rm(THREAD); | |
| 1126 char* name = parsed_name->as_C_string(); | |
| 1127 char* index = strrchr(name, '/'); | |
| 1128 *index = '\0'; // chop to just the package name | |
| 1129 while ((index = strchr(name, '/')) != NULL) { | |
| 1130 *index = '.'; // replace '/' with '.' in package name | |
| 1131 } | |
| 1132 const char* fmt = "Prohibited package name: %s"; | |
| 1133 size_t len = strlen(fmt) + strlen(name); | |
| 1134 char* message = NEW_RESOURCE_ARRAY(char, len); | |
| 1135 jio_snprintf(message, len, fmt, name); | |
| 1136 Exceptions::_throw_msg(THREAD_AND_LOCATION, | |
| 1137 vmSymbols::java_lang_SecurityException(), message); | |
| 1138 } | |
| 1139 | |
| 1140 if (!HAS_PENDING_EXCEPTION) { | |
|
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1141 assert(parsed_name != NULL, "Sanity"); |
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1142 assert(class_name == NULL || class_name == parsed_name, "name mismatch"); |
| 0 | 1143 // Verification prevents us from creating names with dots in them, this |
| 1144 // asserts that that's the case. | |
| 1145 assert(is_internal_format(parsed_name), | |
| 1146 "external class name format used internally"); | |
| 1147 | |
| 1148 // Add class just loaded | |
| 514 | 1149 // If a class loader supports parallel classloading handle parallel define requests |
|
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1150 // find_or_define_instance_class may return a different InstanceKlass |
| 514 | 1151 if (is_parallelCapable(class_loader)) { |
| 1152 k = find_or_define_instance_class(class_name, class_loader, k, THREAD); | |
| 1153 } else { | |
| 1154 define_instance_class(k, THREAD); | |
| 1155 } | |
| 0 | 1156 } |
| 1157 | |
| 1158 // If parsing the class file or define_instance_class failed, we | |
| 1159 // need to remove the placeholder added on our behalf. But we | |
| 1160 // must make sure parsed_name is valid first (it won't be if we had | |
| 1161 // a format error before the class was parsed far enough to | |
| 1162 // find the name). | |
|
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1163 if (HAS_PENDING_EXCEPTION && parsed_name != NULL) { |
| 0 | 1164 unsigned int p_hash = placeholders()->compute_hash(parsed_name, |
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1165 loader_data); |
| 0 | 1166 int p_index = placeholders()->hash_to_index(p_hash); |
| 1167 { | |
| 1168 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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1169 placeholders()->find_and_remove(p_index, p_hash, parsed_name, loader_data, THREAD); |
| 0 | 1170 SystemDictionary_lock->notify_all(); |
| 1171 } | |
| 1172 return NULL; | |
| 1173 } | |
| 1174 | |
| 1175 // Make sure that we didn't leave a place holder in the | |
| 1176 // SystemDictionary; this is only done on success | |
| 1177 debug_only( { | |
| 1178 if (!HAS_PENDING_EXCEPTION) { | |
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1179 assert(parsed_name != NULL, "parsed_name is still null?"); |
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1180 Symbol* h_name = k->name(); |
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1181 ClassLoaderData *defining_loader_data = k->class_loader_data(); |
| 0 | 1182 |
| 1183 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 1184 | |
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1185 Klass* check = find_class(parsed_name, loader_data); |
| 0 | 1186 assert(check == k(), "should be present in the dictionary"); |
| 1187 | |
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1188 Klass* check2 = find_class(h_name, defining_loader_data); |
| 0 | 1189 assert(check == check2, "name inconsistancy in SystemDictionary"); |
| 1190 } | |
| 1191 } ); | |
| 1192 | |
| 1193 return k(); | |
| 1194 } | |
| 1195 | |
| 1196 | |
| 6197 | 1197 void SystemDictionary::set_shared_dictionary(HashtableBucket<mtClass>* t, int length, |
| 0 | 1198 int number_of_entries) { |
| 6197 | 1199 assert(length == _nof_buckets * sizeof(HashtableBucket<mtClass>), |
| 0 | 1200 "bad shared dictionary size."); |
| 1201 _shared_dictionary = new Dictionary(_nof_buckets, t, number_of_entries); | |
| 1202 } | |
| 1203 | |
| 1204 | |
| 1205 // If there is a shared dictionary, then find the entry for the | |
| 1206 // given shared system class, if any. | |
| 1207 | |
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1208 Klass* SystemDictionary::find_shared_class(Symbol* class_name) { |
| 0 | 1209 if (shared_dictionary() != NULL) { |
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1210 unsigned int d_hash = shared_dictionary()->compute_hash(class_name, NULL); |
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1211 int d_index = shared_dictionary()->hash_to_index(d_hash); |
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1212 |
| 0 | 1213 return shared_dictionary()->find_shared_class(d_index, d_hash, class_name); |
| 1214 } else { | |
| 1215 return NULL; | |
| 1216 } | |
| 1217 } | |
| 1218 | |
| 1219 | |
| 1220 // Load a class from the shared spaces (found through the shared system | |
| 1221 // dictionary). Force the superclass and all interfaces to be loaded. | |
| 1222 // Update the class definition to include sibling classes and no | |
| 1223 // subclasses (yet). [Classes in the shared space are not part of the | |
| 1224 // object hierarchy until loaded.] | |
| 1225 | |
| 1226 instanceKlassHandle SystemDictionary::load_shared_class( | |
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1227 Symbol* class_name, Handle class_loader, TRAPS) { |
| 0 | 1228 instanceKlassHandle ik (THREAD, find_shared_class(class_name)); |
| 1229 return load_shared_class(ik, class_loader, THREAD); | |
| 1230 } | |
| 1231 | |
| 1232 // Note well! Changes to this method may affect oop access order | |
| 1233 // in the shared archive. Please take care to not make changes that | |
| 1234 // adversely affect cold start time by changing the oop access order | |
| 1235 // that is specified in dump.cpp MarkAndMoveOrderedReadOnly and | |
| 1236 // MarkAndMoveOrderedReadWrite closures. | |
| 1237 instanceKlassHandle SystemDictionary::load_shared_class( | |
| 1238 instanceKlassHandle ik, Handle class_loader, TRAPS) { | |
| 1239 assert(class_loader.is_null(), "non-null classloader for shared class?"); | |
| 1240 if (ik.not_null()) { | |
| 1241 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1242 Symbol* class_name = ik->name(); |
| 0 | 1243 |
| 1244 // Found the class, now load the superclass and interfaces. If they | |
| 1245 // are shared, add them to the main system dictionary and reset | |
| 1246 // their hierarchy references (supers, subs, and interfaces). | |
| 1247 | |
| 1248 if (ik->super() != NULL) { | |
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1249 Symbol* cn = ik->super()->name(); |
| 0 | 1250 resolve_super_or_fail(class_name, cn, |
| 1251 class_loader, Handle(), true, CHECK_(nh)); | |
| 1252 } | |
| 1253 | |
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1254 Array<Klass*>* interfaces = ik->local_interfaces(); |
| 0 | 1255 int num_interfaces = interfaces->length(); |
| 1256 for (int index = 0; index < num_interfaces; index++) { | |
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1257 Klass* k = interfaces->at(index); |
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1258 |
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1259 // Note: can not use InstanceKlass::cast here because |
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1260 // interfaces' InstanceKlass's C++ vtbls haven't been |
| 0 | 1261 // reinitialized yet (they will be once the interface classes |
| 1262 // are loaded) | |
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1263 Symbol* name = k->name(); |
| 0 | 1264 resolve_super_or_fail(class_name, name, class_loader, Handle(), false, CHECK_(nh)); |
| 1265 } | |
| 1266 | |
| 1267 // Adjust methods to recover missing data. They need addresses for | |
| 1268 // interpreter entry points and their default native method address | |
| 1269 // must be reset. | |
| 1270 | |
| 1271 // Updating methods must be done under a lock so multiple | |
| 1272 // threads don't update these in parallel | |
| 1273 // Shared classes are all currently loaded by the bootstrap | |
| 1274 // classloader, so this will never cause a deadlock on | |
| 1275 // a custom class loader lock. | |
| 1276 | |
| 1277 { | |
| 1278 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
| 1279 check_loader_lock_contention(lockObject, THREAD); | |
| 1280 ObjectLocker ol(lockObject, THREAD, true); | |
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1281 ik->restore_unshareable_info(CHECK_(nh)); |
| 0 | 1282 } |
| 1283 | |
| 1284 if (TraceClassLoading) { | |
| 1285 ResourceMark rm; | |
| 1286 tty->print("[Loaded %s", ik->external_name()); | |
| 1287 tty->print(" from shared objects file"); | |
| 1288 tty->print_cr("]"); | |
| 1289 } | |
| 1290 // notify a class loaded from shared object | |
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1291 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(ik()), |
| 0 | 1292 true /* shared class */); |
| 1293 } | |
| 1294 return ik; | |
| 1295 } | |
| 1296 | |
| 1297 #ifdef KERNEL | |
| 1298 // Some classes on the bootstrap class path haven't been installed on the | |
| 1299 // system yet. Call the DownloadManager method to make them appear in the | |
| 1300 // bootstrap class path and try again to load the named class. | |
| 1301 // Note that with delegation class loaders all classes in another loader will | |
| 1302 // first try to call this so it'd better be fast!! | |
| 1303 static instanceKlassHandle download_and_retry_class_load( | |
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1304 Symbol* class_name, |
| 0 | 1305 TRAPS) { |
| 1306 | |
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1307 Klass* dlm = SystemDictionary::DownloadManager_klass(); |
| 0 | 1308 instanceKlassHandle nk; |
| 1309 | |
| 1310 // If download manager class isn't loaded just return. | |
| 1311 if (dlm == NULL) return nk; | |
| 1312 | |
| 1313 { HandleMark hm(THREAD); | |
| 1314 ResourceMark rm(THREAD); | |
| 1315 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nk)); | |
| 1316 Handle class_string = java_lang_String::externalize_classname(s, CHECK_(nk)); | |
| 1317 | |
| 1318 // return value | |
| 1319 JavaValue result(T_OBJECT); | |
| 1320 | |
| 1321 // Call the DownloadManager. We assume that it has a lock because | |
| 1322 // multiple classes could be not found and downloaded at the same time. | |
| 1323 // class sun.misc.DownloadManager; | |
| 1324 // public static String getBootClassPathEntryForClass(String className); | |
| 1325 JavaCalls::call_static(&result, | |
| 1326 KlassHandle(THREAD, dlm), | |
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1327 vmSymbols::getBootClassPathEntryForClass_name(), |
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1328 vmSymbols::string_string_signature(), |
| 0 | 1329 class_string, |
| 1330 CHECK_(nk)); | |
| 1331 | |
| 1332 // Get result.string and add to bootclasspath | |
| 1333 assert(result.get_type() == T_OBJECT, "just checking"); | |
| 1334 oop obj = (oop) result.get_jobject(); | |
| 1335 if (obj == NULL) { return nk; } | |
| 1336 | |
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1337 Handle h_obj(THREAD, obj); |
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1338 char* new_class_name = java_lang_String::as_platform_dependent_str(h_obj, |
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1339 CHECK_(nk)); |
| 0 | 1340 |
| 1341 // lock the loader | |
| 1342 // we use this lock because JVMTI does. | |
| 1343 Handle loader_lock(THREAD, SystemDictionary::system_loader_lock()); | |
| 1344 | |
| 1345 ObjectLocker ol(loader_lock, THREAD); | |
| 1346 // add the file to the bootclasspath | |
| 1347 ClassLoader::update_class_path_entry_list(new_class_name, true); | |
| 1348 } // end HandleMark | |
| 1349 | |
| 1350 if (TraceClassLoading) { | |
| 1351 ClassLoader::print_bootclasspath(); | |
| 1352 } | |
| 1353 return ClassLoader::load_classfile(class_name, CHECK_(nk)); | |
| 1354 } | |
| 1355 #endif // KERNEL | |
| 1356 | |
| 1357 | |
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1358 instanceKlassHandle SystemDictionary::load_instance_class(Symbol* class_name, Handle class_loader, TRAPS) { |
| 0 | 1359 instanceKlassHandle nh = instanceKlassHandle(); // null Handle |
| 1360 if (class_loader.is_null()) { | |
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1361 |
| 0 | 1362 // Search the shared system dictionary for classes preloaded into the |
| 1363 // shared spaces. | |
| 1364 instanceKlassHandle k; | |
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1365 { |
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1366 PerfTraceTime vmtimer(ClassLoader::perf_shared_classload_time()); |
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1367 k = load_shared_class(class_name, class_loader, THREAD); |
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1368 } |
| 0 | 1369 |
| 1370 if (k.is_null()) { | |
| 1371 // Use VM class loader | |
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1372 PerfTraceTime vmtimer(ClassLoader::perf_sys_classload_time()); |
| 0 | 1373 k = ClassLoader::load_classfile(class_name, CHECK_(nh)); |
| 1374 } | |
| 1375 | |
| 1376 #ifdef KERNEL | |
| 1377 // If the VM class loader has failed to load the class, call the | |
| 1378 // DownloadManager class to make it magically appear on the classpath | |
| 1379 // and try again. This is only configured with the Kernel VM. | |
| 1380 if (k.is_null()) { | |
| 1381 k = download_and_retry_class_load(class_name, CHECK_(nh)); | |
| 1382 } | |
| 1383 #endif // KERNEL | |
| 1384 | |
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1385 // find_or_define_instance_class may return a different InstanceKlass |
| 0 | 1386 if (!k.is_null()) { |
| 1387 k = find_or_define_instance_class(class_name, class_loader, k, CHECK_(nh)); | |
| 1388 } | |
| 1389 return k; | |
| 1390 } else { | |
| 1391 // Use user specified class loader to load class. Call loadClass operation on class_loader. | |
| 1392 ResourceMark rm(THREAD); | |
| 1393 | |
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1394 assert(THREAD->is_Java_thread(), "must be a JavaThread"); |
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1395 JavaThread* jt = (JavaThread*) THREAD; |
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1396 |
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1397 PerfClassTraceTime vmtimer(ClassLoader::perf_app_classload_time(), |
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1398 ClassLoader::perf_app_classload_selftime(), |
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1399 ClassLoader::perf_app_classload_count(), |
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1400 jt->get_thread_stat()->perf_recursion_counts_addr(), |
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1401 jt->get_thread_stat()->perf_timers_addr(), |
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1402 PerfClassTraceTime::CLASS_LOAD); |
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1403 |
| 0 | 1404 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nh)); |
| 1405 // Translate to external class name format, i.e., convert '/' chars to '.' | |
| 1406 Handle string = java_lang_String::externalize_classname(s, CHECK_(nh)); | |
| 1407 | |
| 1408 JavaValue result(T_OBJECT); | |
| 1409 | |
| 1142 | 1410 KlassHandle spec_klass (THREAD, SystemDictionary::ClassLoader_klass()); |
| 0 | 1411 |
| 514 | 1412 // Call public unsynchronized loadClass(String) directly for all class loaders |
| 1413 // for parallelCapable class loaders. JDK >=7, loadClass(String, boolean) will | |
| 1414 // acquire a class-name based lock rather than the class loader object lock. | |
| 1415 // JDK < 7 already acquire the class loader lock in loadClass(String, boolean), | |
| 1416 // so the call to loadClassInternal() was not required. | |
| 1417 // | |
| 1418 // UnsyncloadClass flag means both call loadClass(String) and do | |
| 1419 // not acquire the class loader lock even for class loaders that are | |
| 1420 // not parallelCapable. This was a risky transitional | |
| 1421 // flag for diagnostic purposes only. It is risky to call | |
| 0 | 1422 // custom class loaders without synchronization. |
| 1423 // WARNING If a custom class loader does NOT synchronizer findClass, or callers of | |
| 514 | 1424 // findClass, the UnsyncloadClass flag risks unexpected timing bugs in the field. |
| 0 | 1425 // Do NOT assume this will be supported in future releases. |
| 514 | 1426 // |
| 1427 // Added MustCallLoadClassInternal in case we discover in the field | |
| 1428 // a customer that counts on this call | |
| 1429 if (MustCallLoadClassInternal && has_loadClassInternal()) { | |
| 0 | 1430 JavaCalls::call_special(&result, |
| 1431 class_loader, | |
| 1432 spec_klass, | |
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1433 vmSymbols::loadClassInternal_name(), |
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1434 vmSymbols::string_class_signature(), |
| 0 | 1435 string, |
| 1436 CHECK_(nh)); | |
| 1437 } else { | |
| 1438 JavaCalls::call_virtual(&result, | |
| 1439 class_loader, | |
| 1440 spec_klass, | |
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1441 vmSymbols::loadClass_name(), |
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1442 vmSymbols::string_class_signature(), |
| 0 | 1443 string, |
| 1444 CHECK_(nh)); | |
| 1445 } | |
| 1446 | |
| 1447 assert(result.get_type() == T_OBJECT, "just checking"); | |
| 1448 oop obj = (oop) result.get_jobject(); | |
| 1449 | |
| 1450 // Primitive classes return null since forName() can not be | |
| 1451 // used to obtain any of the Class objects representing primitives or void | |
| 1452 if ((obj != NULL) && !(java_lang_Class::is_primitive(obj))) { | |
| 1453 instanceKlassHandle k = | |
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1454 instanceKlassHandle(THREAD, java_lang_Class::as_Klass(obj)); |
| 0 | 1455 // For user defined Java class loaders, check that the name returned is |
| 1456 // the same as that requested. This check is done for the bootstrap | |
| 1457 // loader when parsing the class file. | |
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1458 if (class_name == k->name()) { |
| 0 | 1459 return k; |
| 1460 } | |
| 1461 } | |
| 1462 // Class is not found or has the wrong name, return NULL | |
| 1463 return nh; | |
| 1464 } | |
| 1465 } | |
| 1466 | |
| 1467 void SystemDictionary::define_instance_class(instanceKlassHandle k, TRAPS) { | |
| 1468 | |
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1469 ClassLoaderData* loader_data = k->class_loader_data(); |
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1470 Handle class_loader_h(THREAD, loader_data->class_loader()); |
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1471 |
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1472 for (uintx it = 0; it < GCExpandToAllocateDelayMillis; it++){} |
| 0 | 1473 |
| 514 | 1474 // for bootstrap and other parallel classloaders don't acquire lock, |
| 1475 // use placeholder token | |
| 1476 // If a parallelCapable class loader calls define_instance_class instead of | |
| 1477 // find_or_define_instance_class to get here, we have a timing | |
| 1478 // hole with systemDictionary updates and check_constraints | |
| 1479 if (!class_loader_h.is_null() && !is_parallelCapable(class_loader_h)) { | |
| 0 | 1480 assert(ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, |
| 1481 compute_loader_lock_object(class_loader_h, THREAD)), | |
| 1482 "define called without lock"); | |
| 1483 } | |
| 1484 | |
| 1485 // Check class-loading constraints. Throw exception if violation is detected. | |
| 1486 // Grabs and releases SystemDictionary_lock | |
| 1487 // The check_constraints/find_class call and update_dictionary sequence | |
| 1488 // must be "atomic" for a specific class/classloader pair so we never | |
| 1489 // define two different instanceKlasses for that class/classloader pair. | |
| 1490 // Existing classloaders will call define_instance_class with the | |
| 1491 // classloader lock held | |
| 1492 // Parallel classloaders will call find_or_define_instance_class | |
| 1493 // which will require a token to perform the define class | |
|
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1494 Symbol* name_h = k->name(); |
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1495 unsigned int d_hash = dictionary()->compute_hash(name_h, loader_data); |
| 0 | 1496 int d_index = dictionary()->hash_to_index(d_hash); |
| 1497 check_constraints(d_index, d_hash, k, class_loader_h, true, CHECK); | |
| 1498 | |
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1499 // Register class just loaded with class loader (placed in Vector) |
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1500 // Note we do this before updating the dictionary, as this can |
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1501 // fail with an OutOfMemoryError (if it does, we will *not* put this |
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1502 // class in the dictionary and will not update the class hierarchy). |
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1503 // JVMTI FollowReferences needs to find the classes this way. |
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1504 if (k->class_loader() != NULL) { |
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1505 methodHandle m(THREAD, Universe::loader_addClass_method()); |
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1506 JavaValue result(T_VOID); |
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1507 JavaCallArguments args(class_loader_h); |
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1508 args.push_oop(Handle(THREAD, k->java_mirror())); |
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1509 JavaCalls::call(&result, m, &args, CHECK); |
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1510 } |
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1511 |
| 0 | 1512 // Add the new class. We need recompile lock during update of CHA. |
| 1513 { | |
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1514 unsigned int p_hash = placeholders()->compute_hash(name_h, loader_data); |
| 0 | 1515 int p_index = placeholders()->hash_to_index(p_hash); |
| 1516 | |
| 1517 MutexLocker mu_r(Compile_lock, THREAD); | |
| 1518 | |
| 1519 // Add to class hierarchy, initialize vtables, and do possible | |
| 1520 // deoptimizations. | |
| 1521 add_to_hierarchy(k, CHECK); // No exception, but can block | |
| 1522 | |
| 1523 // Add to systemDictionary - so other classes can see it. | |
| 1524 // Grabs and releases SystemDictionary_lock | |
| 1525 update_dictionary(d_index, d_hash, p_index, p_hash, | |
| 1526 k, class_loader_h, THREAD); | |
| 1527 } | |
| 1528 k->eager_initialize(THREAD); | |
| 1529 | |
| 1530 // notify jvmti | |
| 1531 if (JvmtiExport::should_post_class_load()) { | |
| 1532 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); | |
| 1533 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); | |
| 1534 | |
| 1535 } | |
| 1536 } | |
| 1537 | |
| 1538 // Support parallel classloading | |
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1539 // All parallel class loaders, including bootstrap classloader |
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1540 // lock a placeholder entry for this class/class_loader pair |
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1541 // to allow parallel defines of different classes for this class loader |
| 514 | 1542 // With AllowParallelDefine flag==true, in case they do not synchronize around |
| 1543 // FindLoadedClass/DefineClass, calls, we check for parallel | |
| 0 | 1544 // loading for them, wait if a defineClass is in progress |
| 1545 // and return the initial requestor's results | |
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1546 // This flag does not apply to the bootstrap classloader. |
| 514 | 1547 // With AllowParallelDefine flag==false, call through to define_instance_class |
| 1548 // which will throw LinkageError: duplicate class definition. | |
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1549 // False is the requested default. |
| 0 | 1550 // For better performance, the class loaders should synchronize |
| 514 | 1551 // findClass(), i.e. FindLoadedClass/DefineClassIfAbsent or they |
| 0 | 1552 // potentially waste time reading and parsing the bytestream. |
| 1553 // Note: VM callers should ensure consistency of k/class_name,class_loader | |
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1554 instanceKlassHandle SystemDictionary::find_or_define_instance_class(Symbol* class_name, Handle class_loader, instanceKlassHandle k, TRAPS) { |
| 0 | 1555 |
| 1556 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1557 Symbol* name_h = k->name(); // passed in class_name may be null |
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1558 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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1559 |
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1560 unsigned int d_hash = dictionary()->compute_hash(name_h, loader_data); |
| 0 | 1561 int d_index = dictionary()->hash_to_index(d_hash); |
| 1562 | |
| 1563 // Hold SD lock around find_class and placeholder creation for DEFINE_CLASS | |
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1564 unsigned int p_hash = placeholders()->compute_hash(name_h, loader_data); |
| 0 | 1565 int p_index = placeholders()->hash_to_index(p_hash); |
| 1566 PlaceholderEntry* probe; | |
| 1567 | |
| 1568 { | |
| 1569 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 1570 // First check if class already defined | |
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1571 if (UnsyncloadClass || (is_parallelDefine(class_loader))) { |
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1572 Klass* check = find_class(d_index, d_hash, name_h, loader_data); |
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1573 if (check != NULL) { |
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1574 return(instanceKlassHandle(THREAD, check)); |
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1575 } |
| 0 | 1576 } |
| 1577 | |
| 1578 // Acquire define token for this class/classloader | |
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1579 probe = placeholders()->find_and_add(p_index, p_hash, name_h, loader_data, PlaceholderTable::DEFINE_CLASS, NULL, THREAD); |
| 514 | 1580 // Wait if another thread defining in parallel |
| 1581 // All threads wait - even those that will throw duplicate class: otherwise | |
| 1582 // caller is surprised by LinkageError: duplicate, but findLoadedClass fails | |
| 1583 // if other thread has not finished updating dictionary | |
| 1584 while (probe->definer() != NULL) { | |
| 1585 SystemDictionary_lock->wait(); | |
| 1586 } | |
| 1587 // Only special cases allow parallel defines and can use other thread's results | |
| 1588 // Other cases fall through, and may run into duplicate defines | |
| 1589 // caught by finding an entry in the SystemDictionary | |
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1590 if ((UnsyncloadClass || is_parallelDefine(class_loader)) && (probe->InstanceKlass() != NULL)) { |
| 0 | 1591 probe->remove_seen_thread(THREAD, PlaceholderTable::DEFINE_CLASS); |
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1592 placeholders()->find_and_remove(p_index, p_hash, name_h, loader_data, THREAD); |
| 514 | 1593 SystemDictionary_lock->notify_all(); |
| 0 | 1594 #ifdef ASSERT |
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1595 Klass* check = find_class(d_index, d_hash, name_h, loader_data); |
| 514 | 1596 assert(check != NULL, "definer missed recording success"); |
| 0 | 1597 #endif |
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1598 return(instanceKlassHandle(THREAD, probe->InstanceKlass())); |
| 0 | 1599 } else { |
| 514 | 1600 // This thread will define the class (even if earlier thread tried and had an error) |
| 1601 probe->set_definer(THREAD); | |
| 0 | 1602 } |
| 1603 } | |
| 1604 | |
| 1605 define_instance_class(k, THREAD); | |
| 1606 | |
| 1607 Handle linkage_exception = Handle(); // null handle | |
| 1608 | |
| 1609 // definer must notify any waiting threads | |
| 1610 { | |
| 1611 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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1612 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name_h, loader_data); |
| 0 | 1613 assert(probe != NULL, "DEFINE_CLASS placeholder lost?"); |
| 1614 if (probe != NULL) { | |
| 1615 if (HAS_PENDING_EXCEPTION) { | |
| 1616 linkage_exception = Handle(THREAD,PENDING_EXCEPTION); | |
| 1617 CLEAR_PENDING_EXCEPTION; | |
| 1618 } else { | |
| 1619 probe->set_instanceKlass(k()); | |
| 1620 } | |
| 1621 probe->set_definer(NULL); | |
| 1622 probe->remove_seen_thread(THREAD, PlaceholderTable::DEFINE_CLASS); | |
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1623 placeholders()->find_and_remove(p_index, p_hash, name_h, loader_data, THREAD); |
| 0 | 1624 SystemDictionary_lock->notify_all(); |
| 1625 } | |
| 1626 } | |
| 1627 | |
| 1628 // Can't throw exception while holding lock due to rank ordering | |
| 1629 if (linkage_exception() != NULL) { | |
| 1630 THROW_OOP_(linkage_exception(), nh); // throws exception and returns | |
| 1631 } | |
| 1632 | |
| 1633 return k; | |
| 1634 } | |
| 1635 Handle SystemDictionary::compute_loader_lock_object(Handle class_loader, TRAPS) { | |
| 1636 // If class_loader is NULL we synchronize on _system_loader_lock_obj | |
| 1637 if (class_loader.is_null()) { | |
| 1638 return Handle(THREAD, _system_loader_lock_obj); | |
| 1639 } else { | |
| 1640 return class_loader; | |
| 1641 } | |
| 1642 } | |
| 1643 | |
| 1644 // This method is added to check how often we have to wait to grab loader | |
| 1645 // lock. The results are being recorded in the performance counters defined in | |
| 1646 // ClassLoader::_sync_systemLoaderLockContentionRate and | |
| 1647 // ClassLoader::_sync_nonSystemLoaderLockConteionRate. | |
| 1648 void SystemDictionary::check_loader_lock_contention(Handle loader_lock, TRAPS) { | |
| 1649 if (!UsePerfData) { | |
| 1650 return; | |
| 1651 } | |
| 1652 | |
| 1653 assert(!loader_lock.is_null(), "NULL lock object"); | |
| 1654 | |
| 1655 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader_lock) | |
| 1656 == ObjectSynchronizer::owner_other) { | |
| 1657 // contention will likely happen, so increment the corresponding | |
| 1658 // contention counter. | |
| 1659 if (loader_lock() == _system_loader_lock_obj) { | |
| 1660 ClassLoader::sync_systemLoaderLockContentionRate()->inc(); | |
| 1661 } else { | |
| 1662 ClassLoader::sync_nonSystemLoaderLockContentionRate()->inc(); | |
| 1663 } | |
| 1664 } | |
| 1665 } | |
| 1666 | |
| 1667 // ---------------------------------------------------------------------------- | |
| 1668 // Lookup | |
| 1669 | |
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1670 Klass* SystemDictionary::find_class(int index, unsigned int hash, |
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1671 Symbol* class_name, |
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1672 ClassLoaderData* loader_data) { |
| 0 | 1673 assert_locked_or_safepoint(SystemDictionary_lock); |
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1674 assert (index == dictionary()->index_for(class_name, loader_data), |
| 0 | 1675 "incorrect index?"); |
| 1676 | |
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1677 Klass* k = dictionary()->find_class(index, hash, class_name, loader_data); |
| 0 | 1678 return k; |
| 1679 } | |
| 1680 | |
| 1681 | |
| 1682 // Basic find on classes in the midst of being loaded | |
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1683 Symbol* SystemDictionary::find_placeholder(Symbol* class_name, |
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1684 ClassLoaderData* loader_data) { |
| 0 | 1685 assert_locked_or_safepoint(SystemDictionary_lock); |
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1686 unsigned int p_hash = placeholders()->compute_hash(class_name, loader_data); |
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1687 int p_index = placeholders()->hash_to_index(p_hash); |
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1688 return placeholders()->find_entry(p_index, p_hash, class_name, loader_data); |
| 0 | 1689 } |
| 1690 | |
| 1691 | |
| 1692 // Used for assertions and verification only | |
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1693 Klass* SystemDictionary::find_class(Symbol* class_name, ClassLoaderData* loader_data) { |
| 0 | 1694 #ifndef ASSERT |
| 1695 guarantee(VerifyBeforeGC || | |
| 1696 VerifyDuringGC || | |
| 1697 VerifyBeforeExit || | |
| 1698 VerifyAfterGC, "too expensive"); | |
| 1699 #endif | |
| 1700 assert_locked_or_safepoint(SystemDictionary_lock); | |
| 1701 | |
| 1702 // First look in the loaded class array | |
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1703 unsigned int d_hash = dictionary()->compute_hash(class_name, loader_data); |
| 0 | 1704 int d_index = dictionary()->hash_to_index(d_hash); |
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1705 return find_class(d_index, d_hash, class_name, loader_data); |
| 0 | 1706 } |
| 1707 | |
| 1708 | |
| 1709 // Get the next class in the diictionary. | |
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1710 Klass* SystemDictionary::try_get_next_class() { |
| 0 | 1711 return dictionary()->try_get_next_class(); |
| 1712 } | |
| 1713 | |
| 1714 | |
| 1715 // ---------------------------------------------------------------------------- | |
| 1716 // Update hierachy. This is done before the new klass has been added to the SystemDictionary. The Recompile_lock | |
| 1717 // is held, to ensure that the compiler is not using the class hierachy, and that deoptimization will kick in | |
| 1718 // before a new class is used. | |
| 1719 | |
| 1720 void SystemDictionary::add_to_hierarchy(instanceKlassHandle k, TRAPS) { | |
| 1721 assert(k.not_null(), "just checking"); | |
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1722 assert_locked_or_safepoint(Compile_lock); |
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1723 |
| 0 | 1724 // Link into hierachy. Make sure the vtables are initialized before linking into |
| 1725 k->append_to_sibling_list(); // add to superklass/sibling list | |
| 1726 k->process_interfaces(THREAD); // handle all "implements" declarations | |
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1727 k->set_init_state(InstanceKlass::loaded); |
| 0 | 1728 // Now flush all code that depended on old class hierarchy. |
| 1729 // Note: must be done *after* linking k into the hierarchy (was bug 12/9/97) | |
| 1730 // Also, first reinitialize vtable because it may have gotten out of synch | |
| 1731 // while the new class wasn't connected to the class hierarchy. | |
| 1732 Universe::flush_dependents_on(k); | |
| 1733 } | |
| 1734 | |
| 1735 | |
| 1736 // ---------------------------------------------------------------------------- | |
| 1737 // GC support | |
| 1738 | |
| 1739 // Following roots during mark-sweep is separated in two phases. | |
| 1740 // | |
| 1741 // The first phase follows preloaded classes and all other system | |
| 1742 // classes, since these will never get unloaded anyway. | |
| 1743 // | |
| 1744 // The second phase removes (unloads) unreachable classes from the | |
| 1745 // system dictionary and follows the remaining classes' contents. | |
| 1746 | |
| 1747 void SystemDictionary::always_strong_oops_do(OopClosure* blk) { | |
| 1748 blk->do_oop(&_java_system_loader); | |
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1749 blk->do_oop(&_system_loader_lock_obj); |
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1750 |
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1751 dictionary()->always_strong_oops_do(blk); |
| 0 | 1752 } |
| 1753 | |
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1754 void SystemDictionary::always_strong_classes_do(KlassClosure* closure) { |
| 0 | 1755 // Follow all system classes and temporary placeholders in dictionary |
|
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1756 dictionary()->always_strong_classes_do(closure); |
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1757 |
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1758 // Placeholders. These represent classes we're actively loading. |
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1759 placeholders()->classes_do(closure); |
| 0 | 1760 } |
| 1761 | |
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1762 // Calculate a "good" systemdictionary size based |
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1763 // on predicted or current loaded classes count |
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1764 int SystemDictionary::calculate_systemdictionary_size(int classcount) { |
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1765 int newsize = _old_default_sdsize; |
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1766 if ((classcount > 0) && !DumpSharedSpaces) { |
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1767 int desiredsize = classcount/_average_depth_goal; |
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1768 for (newsize = _primelist[_sdgeneration]; _sdgeneration < _prime_array_size -1; |
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1769 newsize = _primelist[++_sdgeneration]) { |
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1770 if (desiredsize <= newsize) { |
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1771 break; |
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1772 } |
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1773 } |
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1774 } |
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1775 return newsize; |
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1776 } |
| 0 | 1777 bool SystemDictionary::do_unloading(BoolObjectClosure* is_alive) { |
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1778 // First, mark for unload all ClassLoaderData referencing a dead class loader. |
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1779 bool has_dead_loaders = ClassLoaderDataGraph::do_unloading(is_alive); |
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1780 bool unloading_occurred = false; |
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1781 if (has_dead_loaders) { |
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1782 unloading_occurred = dictionary()->do_unloading(); |
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1783 constraints()->purge_loader_constraints(); |
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1784 resolution_errors()->purge_resolution_errors(); |
| 0 | 1785 } |
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1786 return unloading_occurred; |
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1787 } |
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1788 |
| 0 | 1789 void SystemDictionary::oops_do(OopClosure* f) { |
| 1790 f->do_oop(&_java_system_loader); | |
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1791 f->do_oop(&_system_loader_lock_obj); |
| 0 | 1792 |
| 1793 // Adjust dictionary | |
| 1794 dictionary()->oops_do(f); | |
| 1795 | |
| 710 | 1796 // Visit extra methods |
| 1903 | 1797 invoke_method_table()->oops_do(f); |
| 0 | 1798 } |
| 1799 | |
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1800 // Extended Class redefinition support. |
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1801 // If one of these classes is replaced, we need to replace it in these places. |
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1802 // KlassClosure::do_klass should take the address of a class but we can |
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1803 // change that later. |
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1804 void SystemDictionary::preloaded_classes_do(KlassClosure* f) { |
|
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1805 for (int k = (int)FIRST_WKID; k < (int)WKID_LIMIT; k++) { |
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1806 f->do_klass(_well_known_klasses[k]); |
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1807 } |
| 0 | 1808 |
| 1809 { | |
| 1810 for (int i = 0; i < T_VOID+1; i++) { | |
| 1811 if (_box_klasses[i] != NULL) { | |
| 1812 assert(i >= T_BOOLEAN, "checking"); | |
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1813 f->do_klass(_box_klasses[i]); |
| 0 | 1814 } |
| 1815 } | |
| 1816 } | |
| 1817 | |
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1818 FilteredFieldsMap::classes_do(f); |
| 0 | 1819 } |
| 1820 | |
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1821 void SystemDictionary::lazily_loaded_classes_do(KlassClosure* f) { |
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1822 f->do_klass(_abstract_ownable_synchronizer_klass); |
| 0 | 1823 } |
| 1824 | |
| 1825 // Just the classes from defining class loaders | |
| 1826 // Don't iterate over placeholders | |
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1827 void SystemDictionary::classes_do(void f(Klass*)) { |
| 0 | 1828 dictionary()->classes_do(f); |
| 1829 } | |
| 1830 | |
| 1831 // Added for initialize_itable_for_klass | |
| 1832 // Just the classes from defining class loaders | |
| 1833 // Don't iterate over placeholders | |
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1834 void SystemDictionary::classes_do(void f(Klass*, TRAPS), TRAPS) { |
| 0 | 1835 dictionary()->classes_do(f, CHECK); |
| 1836 } | |
| 1837 | |
| 1838 // All classes, and their class loaders | |
| 1839 // Don't iterate over placeholders | |
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1840 void SystemDictionary::classes_do(void f(Klass*, ClassLoaderData*)) { |
| 0 | 1841 dictionary()->classes_do(f); |
| 1842 } | |
| 1843 | |
| 1844 // All classes, and their class loaders | |
| 1845 // (added for helpers that use HandleMarks and ResourceMarks) | |
| 1846 // Don't iterate over placeholders | |
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1847 void SystemDictionary::classes_do(void f(Klass*, ClassLoaderData*, TRAPS), TRAPS) { |
| 0 | 1848 dictionary()->classes_do(f, CHECK); |
| 1849 } | |
| 1850 | |
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1851 void SystemDictionary::placeholders_do(void f(Symbol*)) { |
| 0 | 1852 placeholders()->entries_do(f); |
| 1853 } | |
| 1854 | |
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1855 void SystemDictionary::methods_do(void f(Method*)) { |
| 0 | 1856 dictionary()->methods_do(f); |
| 1903 | 1857 invoke_method_table()->methods_do(f); |
| 0 | 1858 } |
| 1859 | |
| 1860 // ---------------------------------------------------------------------------- | |
| 1861 // Lazily load klasses | |
| 1862 | |
| 1863 void SystemDictionary::load_abstract_ownable_synchronizer_klass(TRAPS) { | |
| 1864 assert(JDK_Version::is_gte_jdk16x_version(), "Must be JDK 1.6 or later"); | |
| 1865 | |
| 1866 // if multiple threads calling this function, only one thread will load | |
| 1867 // the class. The other threads will find the loaded version once the | |
| 1868 // class is loaded. | |
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1869 Klass* aos = _abstract_ownable_synchronizer_klass; |
| 0 | 1870 if (aos == NULL) { |
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1871 Klass* k = resolve_or_fail(vmSymbols::java_util_concurrent_locks_AbstractOwnableSynchronizer(), true, CHECK); |
| 0 | 1872 // Force a fence to prevent any read before the write completes |
| 1873 OrderAccess::fence(); | |
| 1874 _abstract_ownable_synchronizer_klass = k; | |
| 1875 } | |
| 1876 } | |
| 1877 | |
| 1878 // ---------------------------------------------------------------------------- | |
| 1879 // Initialization | |
| 1880 | |
| 1881 void SystemDictionary::initialize(TRAPS) { | |
| 1882 // Allocate arrays | |
| 1883 assert(dictionary() == NULL, | |
| 1884 "SystemDictionary should only be initialized once"); | |
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1885 _sdgeneration = 0; |
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1886 _dictionary = new Dictionary(calculate_systemdictionary_size(PredictedLoadedClassCount)); |
| 1903 | 1887 _placeholders = new PlaceholderTable(_nof_buckets); |
| 0 | 1888 _number_of_modifications = 0; |
| 1903 | 1889 _loader_constraints = new LoaderConstraintTable(_loader_constraint_size); |
| 1890 _resolution_errors = new ResolutionErrorTable(_resolution_error_size); | |
| 1891 _invoke_method_table = new SymbolPropertyTable(_invoke_method_size); | |
| 0 | 1892 |
| 1893 // Allocate private object used as system class loader lock | |
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1894 _system_loader_lock_obj = oopFactory::new_intArray(0, CHECK); |
| 0 | 1895 // Initialize basic classes |
| 1896 initialize_preloaded_classes(CHECK); | |
| 1897 } | |
| 1898 | |
|
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1899 // Compact table of directions on the initialization of klasses: |
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1900 static const short wk_init_info[] = { |
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1901 #define WK_KLASS_INIT_INFO(name, symbol, option) \ |
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1902 ( ((int)vmSymbols::VM_SYMBOL_ENUM_NAME(symbol) \ |
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1903 << SystemDictionary::CEIL_LG_OPTION_LIMIT) \ |
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1904 | (int)SystemDictionary::option ), |
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1905 WK_KLASSES_DO(WK_KLASS_INIT_INFO) |
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1906 #undef WK_KLASS_INIT_INFO |
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1907 0 |
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1908 }; |
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1909 |
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1910 bool SystemDictionary::initialize_wk_klass(WKID id, int init_opt, TRAPS) { |
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1911 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1912 int info = wk_init_info[id - FIRST_WKID]; |
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1913 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
|
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1914 Symbol* symbol = vmSymbols::symbol_at((vmSymbols::SID)sid); |
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1915 Klass** klassp = &_well_known_klasses[id]; |
| 2460 | 1916 bool must_load = (init_opt < SystemDictionary::Opt); |
| 1917 bool try_load = true; | |
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1918 if (init_opt == SystemDictionary::Opt_Kernel) { |
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1919 #ifndef KERNEL |
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1920 try_load = false; |
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1921 #endif //KERNEL |
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1922 } |
| 2460 | 1923 if ((*klassp) == NULL && try_load) { |
|
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1924 if (must_load) { |
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1925 (*klassp) = resolve_or_fail(symbol, true, CHECK_0); // load required class |
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1926 } else { |
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1927 (*klassp) = resolve_or_null(symbol, CHECK_0); // load optional klass |
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1928 } |
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1929 } |
| 2460 | 1930 return ((*klassp) != NULL); |
|
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1931 } |
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1932 |
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1933 void SystemDictionary::initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS) { |
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1934 assert((int)start_id <= (int)limit_id, "IDs are out of order!"); |
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1935 for (int id = (int)start_id; id < (int)limit_id; id++) { |
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1936 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1937 int info = wk_init_info[id - FIRST_WKID]; |
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1938 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1939 int opt = (info & right_n_bits(CEIL_LG_OPTION_LIMIT)); |
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1940 |
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1941 initialize_wk_klass((WKID)id, opt, CHECK); |
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1942 |
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1943 // Update limits, so find_well_known_klass can be very fast: |
|
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1944 Symbol* s = vmSymbols::symbol_at((vmSymbols::SID)sid); |
|
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1945 if (wk_klass_name_limits[1] == NULL) { |
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1946 wk_klass_name_limits[0] = wk_klass_name_limits[1] = s; |
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1947 } else if (wk_klass_name_limits[1] < s) { |
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1948 wk_klass_name_limits[1] = s; |
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1949 } else if (wk_klass_name_limits[0] > s) { |
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1950 wk_klass_name_limits[0] = s; |
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1951 } |
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1952 } |
| 710 | 1953 |
| 1954 // move the starting value forward to the limit: | |
| 1955 start_id = limit_id; | |
|
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1956 } |
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1957 |
| 0 | 1958 |
| 1959 void SystemDictionary::initialize_preloaded_classes(TRAPS) { | |
| 1142 | 1960 assert(WK_KLASS(Object_klass) == NULL, "preloaded classes should only be initialized once"); |
| 0 | 1961 // Preload commonly used klasses |
|
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1962 WKID scan = FIRST_WKID; |
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1963 // first do Object, then String, Class |
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1964 if (UseSharedSpaces) { |
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1965 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Object_klass), scan, CHECK); |
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1966 // Initialize the constant pool for the Object_class |
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1967 InstanceKlass* ik = InstanceKlass::cast(Object_klass()); |
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1968 ik->constants()->restore_unshareable_info(CHECK); |
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1969 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Class_klass), scan, CHECK); |
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1970 } else { |
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1971 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Class_klass), scan, CHECK); |
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1972 } |
|
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1973 |
| 6057 | 1974 // Calculate offsets for String and Class classes since they are loaded and |
| 1975 // can be used after this point. | |
| 1976 java_lang_String::compute_offsets(); | |
| 3938 | 1977 java_lang_Class::compute_offsets(); |
|
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1978 |
| 0 | 1979 // Fixup mirrors for classes loaded before java.lang.Class. |
| 1980 // These calls iterate over the objects currently in the perm gen | |
| 1981 // so calling them at this point is matters (not before when there | |
| 1982 // are fewer objects and not later after there are more objects | |
| 1983 // in the perm gen. | |
| 1984 Universe::initialize_basic_type_mirrors(CHECK); | |
| 1985 Universe::fixup_mirrors(CHECK); | |
| 1986 | |
|
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1987 // do a bunch more: |
| 1142 | 1988 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Reference_klass), scan, CHECK); |
| 0 | 1989 |
| 1990 // Preload ref klasses and set reference types | |
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1991 InstanceKlass::cast(WK_KLASS(Reference_klass))->set_reference_type(REF_OTHER); |
|
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1992 InstanceRefKlass::update_nonstatic_oop_maps(WK_KLASS(Reference_klass)); |
| 0 | 1993 |
| 1142 | 1994 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(PhantomReference_klass), scan, CHECK); |
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1995 InstanceKlass::cast(WK_KLASS(SoftReference_klass))->set_reference_type(REF_SOFT); |
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1996 InstanceKlass::cast(WK_KLASS(WeakReference_klass))->set_reference_type(REF_WEAK); |
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1997 InstanceKlass::cast(WK_KLASS(FinalReference_klass))->set_reference_type(REF_FINAL); |
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1998 InstanceKlass::cast(WK_KLASS(PhantomReference_klass))->set_reference_type(REF_PHANTOM); |
|
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1999 |
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2000 // JSR 292 classes |
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2001 WKID jsr292_group_start = WK_KLASS_ENUM_NAME(MethodHandle_klass); |
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2002 WKID jsr292_group_end = WK_KLASS_ENUM_NAME(VolatileCallSite_klass); |
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2003 initialize_wk_klasses_until(jsr292_group_start, scan, CHECK); |
|
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2004 if (EnableInvokeDynamic) { |
|
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2005 initialize_wk_klasses_through(jsr292_group_end, scan, CHECK); |
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2006 } else { |
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2007 // Skip the JSR 292 classes, if not enabled. |
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2008 scan = WKID(jsr292_group_end + 1); |
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2009 } |
| 710 | 2010 |
|
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2011 initialize_wk_klasses_until(WKID_LIMIT, scan, CHECK); |
| 0 | 2012 |
| 1142 | 2013 _box_klasses[T_BOOLEAN] = WK_KLASS(Boolean_klass); |
| 2014 _box_klasses[T_CHAR] = WK_KLASS(Character_klass); | |
| 2015 _box_klasses[T_FLOAT] = WK_KLASS(Float_klass); | |
| 2016 _box_klasses[T_DOUBLE] = WK_KLASS(Double_klass); | |
| 2017 _box_klasses[T_BYTE] = WK_KLASS(Byte_klass); | |
| 2018 _box_klasses[T_SHORT] = WK_KLASS(Short_klass); | |
| 2019 _box_klasses[T_INT] = WK_KLASS(Integer_klass); | |
| 2020 _box_klasses[T_LONG] = WK_KLASS(Long_klass); | |
|
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2021 //_box_klasses[T_OBJECT] = WK_KLASS(object_klass); |
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2022 //_box_klasses[T_ARRAY] = WK_KLASS(object_klass); |
| 0 | 2023 |
| 2024 #ifdef KERNEL | |
| 3938 | 2025 if (DownloadManager_klass() == NULL) { |
| 0 | 2026 warning("Cannot find sun/jkernel/DownloadManager"); |
| 2027 } | |
| 2028 #endif // KERNEL | |
| 514 | 2029 |
| 0 | 2030 { // Compute whether we should use loadClass or loadClassInternal when loading classes. |
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2031 Method* method = InstanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::loadClassInternal_name(), vmSymbols::string_class_signature()); |
| 0 | 2032 _has_loadClassInternal = (method != NULL); |
| 2033 } | |
| 2034 { // Compute whether we should use checkPackageAccess or NOT | |
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2035 Method* method = InstanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::checkPackageAccess_name(), vmSymbols::class_protectiondomain_signature()); |
| 0 | 2036 _has_checkPackageAccess = (method != NULL); |
| 2037 } | |
| 2038 } | |
| 2039 | |
| 2040 // Tells if a given klass is a box (wrapper class, such as java.lang.Integer). | |
| 2041 // If so, returns the basic type it holds. If not, returns T_OBJECT. | |
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2042 BasicType SystemDictionary::box_klass_type(Klass* k) { |
| 0 | 2043 assert(k != NULL, ""); |
| 2044 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { | |
| 2045 if (_box_klasses[i] == k) | |
| 2046 return (BasicType)i; | |
| 2047 } | |
| 2048 return T_OBJECT; | |
| 2049 } | |
| 2050 | |
| 2051 // Constraints on class loaders. The details of the algorithm can be | |
| 2052 // found in the OOPSLA'98 paper "Dynamic Class Loading in the Java | |
| 2053 // Virtual Machine" by Sheng Liang and Gilad Bracha. The basic idea is | |
| 2054 // that the system dictionary needs to maintain a set of contraints that | |
| 2055 // must be satisfied by all classes in the dictionary. | |
| 2056 // if defining is true, then LinkageError if already in systemDictionary | |
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2057 // if initiating loader, then ok if InstanceKlass matches existing entry |
| 0 | 2058 |
| 2059 void SystemDictionary::check_constraints(int d_index, unsigned int d_hash, | |
| 2060 instanceKlassHandle k, | |
| 2061 Handle class_loader, bool defining, | |
| 2062 TRAPS) { | |
| 2063 const char *linkage_error = NULL; | |
| 2064 { | |
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2065 Symbol* name = k->name(); |
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2066 ClassLoaderData *loader_data = class_loader_data(class_loader); |
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2067 |
| 0 | 2068 MutexLocker mu(SystemDictionary_lock, THREAD); |
| 2069 | |
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2070 Klass* check = find_class(d_index, d_hash, name, loader_data); |
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2071 if (check != (Klass*)NULL) { |
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2072 // if different InstanceKlass - duplicate class definition, |
| 0 | 2073 // else - ok, class loaded by a different thread in parallel, |
| 2074 // we should only have found it if it was done loading and ok to use | |
| 2075 // system dictionary only holds instance classes, placeholders | |
| 2076 // also holds array classes | |
| 2077 | |
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2078 assert(check->oop_is_instance(), "noninstance in systemdictionary"); |
| 0 | 2079 if ((defining == true) || (k() != check)) { |
| 2080 linkage_error = "loader (instance of %s): attempted duplicate class " | |
| 2081 "definition for name: \"%s\""; | |
| 2082 } else { | |
| 2083 return; | |
| 2084 } | |
| 2085 } | |
| 2086 | |
| 2087 #ifdef ASSERT | |
|
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2088 Symbol* ph_check = find_placeholder(name, loader_data); |
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2089 assert(ph_check == NULL || ph_check == name, "invalid symbol"); |
| 0 | 2090 #endif |
| 2091 | |
| 2092 if (linkage_error == NULL) { | |
| 2093 if (constraints()->check_or_update(k, class_loader, name) == false) { | |
| 2094 linkage_error = "loader constraint violation: loader (instance of %s)" | |
| 2095 " previously initiated loading for a different type with name \"%s\""; | |
| 2096 } | |
| 2097 } | |
| 2098 } | |
| 2099 | |
| 2100 // Throw error now if needed (cannot throw while holding | |
| 2101 // SystemDictionary_lock because of rank ordering) | |
| 2102 | |
| 2103 if (linkage_error) { | |
| 2104 ResourceMark rm(THREAD); | |
| 2105 const char* class_loader_name = loader_name(class_loader()); | |
| 2106 char* type_name = k->name()->as_C_string(); | |
| 2107 size_t buflen = strlen(linkage_error) + strlen(class_loader_name) + | |
| 2108 strlen(type_name); | |
| 2109 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
| 2110 jio_snprintf(buf, buflen, linkage_error, class_loader_name, type_name); | |
| 2111 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); | |
| 2112 } | |
| 2113 } | |
| 2114 | |
| 2115 | |
| 2116 // Update system dictionary - done after check_constraint and add_to_hierachy | |
| 2117 // have been called. | |
| 2118 void SystemDictionary::update_dictionary(int d_index, unsigned int d_hash, | |
| 2119 int p_index, unsigned int p_hash, | |
| 2120 instanceKlassHandle k, | |
| 2121 Handle class_loader, | |
| 2122 TRAPS) { | |
| 2123 // Compile_lock prevents systemDictionary updates during compilations | |
| 2124 assert_locked_or_safepoint(Compile_lock); | |
|
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2125 Symbol* name = k->name(); |
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2126 ClassLoaderData *loader_data = class_loader_data(class_loader); |
| 0 | 2127 |
| 2128 { | |
| 2129 MutexLocker mu1(SystemDictionary_lock, THREAD); | |
| 2130 | |
| 2131 // See whether biased locking is enabled and if so set it for this | |
| 2132 // klass. | |
| 2133 // Note that this must be done past the last potential blocking | |
| 2134 // point / safepoint. We enable biased locking lazily using a | |
| 2135 // VM_Operation to iterate the SystemDictionary and installing the | |
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2136 // biasable mark word into each InstanceKlass's prototype header. |
| 0 | 2137 // To avoid race conditions where we accidentally miss enabling the |
| 2138 // optimization for one class in the process of being added to the | |
| 2139 // dictionary, we must not safepoint after the test of | |
| 2140 // BiasedLocking::enabled(). | |
| 2141 if (UseBiasedLocking && BiasedLocking::enabled()) { | |
| 2142 // Set biased locking bit for all loaded classes; it will be | |
| 2143 // cleared if revocation occurs too often for this type | |
| 2144 // NOTE that we must only do this when the class is initally | |
| 2145 // defined, not each time it is referenced from a new class loader | |
| 2146 if (k->class_loader() == class_loader()) { | |
| 2147 k->set_prototype_header(markOopDesc::biased_locking_prototype()); | |
| 2148 } | |
| 2149 } | |
| 2150 | |
|
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2151 // Assign a classid if one has not already been assigned. The |
|
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2152 // counter does not need to be atomically incremented since this |
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2153 // is only done while holding the SystemDictionary_lock. |
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2154 // All loaded classes get a unique ID. |
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2155 TRACE_INIT_ID(k); |
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2156 |
| 0 | 2157 // Check for a placeholder. If there, remove it and make a |
| 2158 // new system dictionary entry. | |
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2159 placeholders()->find_and_remove(p_index, p_hash, name, loader_data, THREAD); |
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2160 Klass* sd_check = find_class(d_index, d_hash, name, loader_data); |
| 0 | 2161 if (sd_check == NULL) { |
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2162 dictionary()->add_klass(name, loader_data, k); |
| 0 | 2163 notice_modification(); |
| 2164 } | |
| 2165 #ifdef ASSERT | |
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2166 sd_check = find_class(d_index, d_hash, name, loader_data); |
| 0 | 2167 assert (sd_check != NULL, "should have entry in system dictionary"); |
| 2168 // Changed to allow PH to remain to complete class circularity checking | |
| 2169 // while only one thread can define a class at one time, multiple | |
| 2170 // classes can resolve the superclass for a class at one time, | |
| 2171 // and the placeholder is used to track that | |
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2172 // Symbol* ph_check = find_placeholder(name, class_loader); |
| 0 | 2173 // assert (ph_check == NULL, "should not have a placeholder entry"); |
| 2174 #endif | |
| 2175 SystemDictionary_lock->notify_all(); | |
| 2176 } | |
| 2177 } | |
| 2178 | |
| 2179 | |
|
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2180 // Try to find a class name using the loader constraints. The |
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2181 // loader constraints might know about a class that isn't fully loaded |
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2182 // yet and these will be ignored. |
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2183 Klass* SystemDictionary::find_constrained_instance_or_array_klass( |
|
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2184 Symbol* class_name, Handle class_loader, TRAPS) { |
| 0 | 2185 |
| 2186 // First see if it has been loaded directly. | |
| 2187 // Force the protection domain to be null. (This removes protection checks.) | |
| 2188 Handle no_protection_domain; | |
|
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2189 Klass* klass = find_instance_or_array_klass(class_name, class_loader, |
|
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2190 no_protection_domain, CHECK_NULL); |
| 0 | 2191 if (klass != NULL) |
| 2192 return klass; | |
| 2193 | |
| 2194 // Now look to see if it has been loaded elsewhere, and is subject to | |
| 2195 // a loader constraint that would require this loader to return the | |
| 2196 // klass that is already loaded. | |
|
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2197 if (FieldType::is_array(class_name)) { |
|
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2198 // For array classes, their Klass*s are not kept in the |
|
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2199 // constraint table. The element Klass*s are. |
|
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2200 FieldArrayInfo fd; |
|
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2201 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
| 0 | 2202 if (t != T_OBJECT) { |
| 2203 klass = Universe::typeArrayKlassObj(t); | |
| 2204 } else { | |
| 2205 MutexLocker mu(SystemDictionary_lock, THREAD); | |
|
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2206 klass = constraints()->find_constrained_klass(fd.object_key(), class_loader); |
| 0 | 2207 } |
| 1336 | 2208 // If element class already loaded, allocate array klass |
| 0 | 2209 if (klass != NULL) { |
|
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2210 klass = Klass::cast(klass)->array_klass_or_null(fd.dimension()); |
| 0 | 2211 } |
| 2212 } else { | |
| 2213 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 2214 // Non-array classes are easy: simply check the constraint table. | |
| 2215 klass = constraints()->find_constrained_klass(class_name, class_loader); | |
| 2216 } | |
| 2217 | |
| 2218 return klass; | |
| 2219 } | |
| 2220 | |
| 2221 | |
|
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2222 bool SystemDictionary::add_loader_constraint(Symbol* class_name, |
| 0 | 2223 Handle class_loader1, |
| 2224 Handle class_loader2, | |
| 2225 Thread* THREAD) { | |
|
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2226 ClassLoaderData* loader_data1 = class_loader_data(class_loader1); |
|
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2227 ClassLoaderData* loader_data2 = class_loader_data(class_loader2); |
|
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2228 |
|
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2229 Symbol* constraint_name = NULL; |
|
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2230 if (!FieldType::is_array(class_name)) { |
| 1336 | 2231 constraint_name = class_name; |
| 2232 } else { | |
|
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2233 // For array classes, their Klass*s are not kept in the |
| 1336 | 2234 // constraint table. The element classes are. |
|
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2235 FieldArrayInfo fd; |
|
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|
2236 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(false)); |
| 1336 | 2237 // primitive types always pass |
| 2238 if (t != T_OBJECT) { | |
| 2239 return true; | |
| 2240 } else { | |
|
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2241 constraint_name = fd.object_key(); |
| 1336 | 2242 } |
| 2243 } | |
|
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2244 unsigned int d_hash1 = dictionary()->compute_hash(constraint_name, loader_data1); |
| 0 | 2245 int d_index1 = dictionary()->hash_to_index(d_hash1); |
| 2246 | |
|
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2247 unsigned int d_hash2 = dictionary()->compute_hash(constraint_name, loader_data2); |
| 0 | 2248 int d_index2 = dictionary()->hash_to_index(d_hash2); |
| 2249 { | |
| 1336 | 2250 MutexLocker mu_s(SystemDictionary_lock, THREAD); |
| 0 | 2251 |
| 1336 | 2252 // Better never do a GC while we're holding these oops |
| 2253 No_Safepoint_Verifier nosafepoint; | |
| 0 | 2254 |
|
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2255 Klass* klass1 = find_class(d_index1, d_hash1, constraint_name, loader_data1); |
|
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2256 Klass* klass2 = find_class(d_index2, d_hash2, constraint_name, loader_data2); |
| 1336 | 2257 return constraints()->add_entry(constraint_name, klass1, class_loader1, |
| 2258 klass2, class_loader2); | |
| 0 | 2259 } |
| 2260 } | |
| 2261 | |
| 2262 // Add entry to resolution error table to record the error when the first | |
| 2263 // attempt to resolve a reference to a class has failed. | |
|
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2264 void SystemDictionary::add_resolution_error(constantPoolHandle pool, int which, Symbol* error) { |
| 0 | 2265 unsigned int hash = resolution_errors()->compute_hash(pool, which); |
| 2266 int index = resolution_errors()->hash_to_index(hash); | |
| 2267 { | |
| 2268 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
| 2269 resolution_errors()->add_entry(index, hash, pool, which, error); | |
| 2270 } | |
| 2271 } | |
| 2272 | |
|
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2273 // Delete a resolution error for RedefineClasses for a constant pool is going away |
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2274 void SystemDictionary::delete_resolution_error(ConstantPool* pool) { |
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2275 resolution_errors()->delete_entry(pool); |
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2276 } |
|
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2277 |
| 0 | 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); | |
|
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2285 return (entry != NULL) ? entry->error() : (Symbol*)NULL; |
| 0 | 2286 } |
| 2287 } | |
| 2288 | |
| 2289 | |
|
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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 |
|
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2292 // intake for constraints. It collects them from several places: |
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2293 // |
|
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2294 // * LinkResolver::resolve_method (if check_access is true) requires |
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2295 // that the resolving class (the caller) and the defining class of |
|
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2296 // the resolved method (the callee) agree on each type in the |
|
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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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2300 // checks. |
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2301 // |
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2302 // * LinkResolver::resolve_field requires that the constant pool |
|
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2303 // attempting to link to a field agree with the field's defining |
|
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2304 // class about the type of the field signature. |
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2305 // |
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2306 // * klassVtable::initialize_vtable requires that, when a class |
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2307 // overrides a vtable entry allocated by a superclass, that the |
|
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2308 // overriding method (i.e., the callee) agree with the superclass |
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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 |
|
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2312 // in its itables, for each non-abstract method installed in an |
|
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2313 // itable, the method (i.e., the callee) agree with the interface |
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2314 // on each type in the method's signature. |
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2315 // |
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2316 // All those methods have a boolean (check_access, checkconstraints) |
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2317 // which turns off the checks. This is used from specialized contexts |
|
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2318 // such as bootstrapping, dumping, and debugging. |
|
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2319 // |
|
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2320 // No direct constraint is placed between the class and its |
|
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2321 // supertypes. Constraints are only placed along linked relations |
|
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2322 // between callers and callees. When a method overrides or implements |
|
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2323 // an abstract method in a supertype (superclass or interface), the |
|
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2324 // constraints are placed as if the supertype were the caller to the |
|
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2325 // overriding method. (This works well, since callers to the |
|
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2326 // supertype have already established agreement between themselves and |
|
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2327 // the supertype.) As a result of all this, a class can disagree with |
|
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2328 // its supertype about the meaning of a type name, as long as that |
|
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2329 // class neither calls a relevant method of the supertype, nor is |
|
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2330 // called (perhaps via an override) from the supertype. |
|
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|
2331 // |
|
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2332 // |
|
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2333 // SystemDictionary::check_signature_loaders(sig, l1, l2) |
|
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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 | |
|
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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. |
|
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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 | |
|
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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()) { | |
|
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2353 Symbol* s = sig_strm.as_symbol(CHECK_NULL); |
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2354 Symbol* sig = s; |
| 0 | 2355 if (!add_loader_constraint(sig, loader1, loader2, THREAD)) { |
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2356 return sig->as_C_string(); |
| 0 | 2357 } |
| 2358 } | |
| 2359 sig_strm.next(); | |
| 2360 } | |
| 2361 return NULL; | |
| 2362 } | |
| 2363 | |
| 2364 | |
|
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|
2365 methodHandle SystemDictionary::find_method_handle_intrinsic(vmIntrinsics::ID iid, |
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|
2366 Symbol* signature, |
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|
2367 TRAPS) { |
|
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|
2368 methodHandle empty; |
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|
2369 assert(EnableInvokeDynamic, ""); |
|
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|
2370 assert(MethodHandles::is_signature_polymorphic(iid) && |
|
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|
2371 MethodHandles::is_signature_polymorphic_intrinsic(iid) && |
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|
2372 iid != vmIntrinsics::_invokeGeneric, |
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|
2373 err_msg("must be a known MH intrinsic iid=%d: %s", iid, vmIntrinsics::name_at(iid))); |
|
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|
2374 |
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|
2375 unsigned int hash = invoke_method_table()->compute_hash(signature, iid); |
| 710 | 2376 int index = invoke_method_table()->hash_to_index(hash); |
|
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2377 SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, iid); |
|
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2378 methodHandle m; |
|
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2379 if (spe == NULL || spe->method() == NULL) { |
|
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2380 spe = NULL; |
| 710 | 2381 // Must create lots of stuff here, but outside of the SystemDictionary lock. |
|
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2382 m = Method::make_method_handle_intrinsic(iid, signature, CHECK_(empty)); |
|
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2383 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_highest_tier, |
|
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2384 methodHandle(), CompileThreshold, "MH", CHECK_(empty)); |
|
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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. | |
|
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2388 { |
|
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|
2389 MutexLocker ml(SystemDictionary_lock, THREAD); |
|
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2390 spe = invoke_method_table()->find_entry(index, hash, signature, iid); |
| 710 | 2391 if (spe == NULL) |
|
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2392 spe = invoke_method_table()->add_entry(index, hash, signature, iid); |
|
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2393 if (spe->method() == NULL) |
|
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2394 spe->set_method(m()); |
|
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2395 } |
|
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|
2396 } |
|
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2397 |
|
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2398 assert(spe != NULL && spe->method() != NULL, ""); |
|
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2399 return spe->method(); |
|
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|
2400 } |
|
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2401 |
|
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|
2402 // Helper for unpacking the return value from linkMethod and linkCallSite. |
|
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2403 static methodHandle unpack_method_and_appendix(Handle mname, |
|
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2404 objArrayHandle appendix_box, |
|
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|
2405 Handle* appendix_result, |
|
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|
2406 TRAPS) { |
|
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|
2407 methodHandle empty; |
|
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|
2408 if (mname.not_null()) { |
|
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2409 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); |
|
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2410 if (vmtarget != NULL && vmtarget->is_method()) { |
|
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2411 Method* m = (Method*)vmtarget; |
|
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2412 oop appendix = appendix_box->obj_at(0); |
|
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|
2413 if (TraceMethodHandles) { |
|
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|
2414 #ifndef PRODUCT |
|
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|
2415 tty->print("Linked method="INTPTR_FORMAT": ", m); |
|
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|
2416 m->print(); |
|
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|
2417 if (appendix != NULL) { tty->print("appendix = "); appendix->print(); } |
|
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|
2418 tty->cr(); |
|
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|
2419 #endif //PRODUCT |
|
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|
2420 } |
|
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2421 (*appendix_result) = Handle(THREAD, appendix); |
|
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2422 return methodHandle(THREAD, m); |
| 710 | 2423 } |
| 2424 } | |
|
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2425 THROW_MSG_(vmSymbols::java_lang_LinkageError(), "bad value from MethodHandleNatives", empty); |
|
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|
2426 return empty; |
|
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|
2427 } |
|
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|
2428 |
|
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|
2429 methodHandle SystemDictionary::find_method_handle_invoker(Symbol* name, |
|
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|
2430 Symbol* signature, |
|
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|
2431 KlassHandle accessing_klass, |
|
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|
2432 Handle* appendix_result, |
|
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|
2433 TRAPS) { |
|
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|
2434 methodHandle empty; |
|
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|
2435 assert(EnableInvokeDynamic, ""); |
|
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|
2436 assert(!THREAD->is_Compiler_thread(), ""); |
|
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|
2437 Handle method_type = |
|
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|
2438 SystemDictionary::find_method_handle_type(signature, accessing_klass, CHECK_(empty)); |
|
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|
2439 if (false) { // FIXME: Decide if the Java upcall should resolve signatures. |
|
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|
2440 method_type = java_lang_String::create_from_symbol(signature, CHECK_(empty)); |
|
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|
2441 } |
|
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|
2442 |
|
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|
2443 KlassHandle mh_klass = SystemDictionary::MethodHandle_klass(); |
|
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|
2444 int ref_kind = JVM_REF_invokeVirtual; |
|
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|
2445 Handle name_str = StringTable::intern(name, CHECK_(empty)); |
|
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|
2446 objArrayHandle appendix_box = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1, CHECK_(empty)); |
|
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|
2447 assert(appendix_box->obj_at(0) == NULL, ""); |
|
1d7922586cf6
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|
2448 |
|
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|
2449 // call java.lang.invoke.MethodHandleNatives::linkMethod(... String, MethodType) -> MemberName |
|
1d7922586cf6
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|
2450 JavaCallArguments args; |
|
1d7922586cf6
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|
2451 args.push_oop(accessing_klass()->java_mirror()); |
|
1d7922586cf6
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|
2452 args.push_int(ref_kind); |
|
1d7922586cf6
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|
2453 args.push_oop(mh_klass()->java_mirror()); |
|
1d7922586cf6
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|
2454 args.push_oop(name_str()); |
|
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|
2455 args.push_oop(method_type()); |
|
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|
2456 args.push_oop(appendix_box()); |
|
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|
2457 JavaValue result(T_OBJECT); |
|
1d7922586cf6
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|
2458 JavaCalls::call_static(&result, |
|
1d7922586cf6
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|
2459 SystemDictionary::MethodHandleNatives_klass(), |
|
1d7922586cf6
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|
2460 vmSymbols::linkMethod_name(), |
|
1d7922586cf6
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|
2461 vmSymbols::linkMethod_signature(), |
|
1d7922586cf6
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|
2462 &args, CHECK_(empty)); |
|
1d7922586cf6
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|
2463 Handle mname(THREAD, (oop) result.get_jobject()); |
|
1d7922586cf6
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|
2464 return unpack_method_and_appendix(mname, appendix_box, appendix_result, THREAD); |
| 710 | 2465 } |
| 2466 | |
|
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|
2467 |
|
2357
8033953d67ff
7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents:
2356
diff
changeset
|
2468 // Ask Java code to find or construct a java.lang.invoke.MethodType for the given |
| 710 | 2469 // signature, as interpreted relative to the given class loader. |
| 2470 // Because of class loader constraints, all method handle usage must be | |
| 2471 // consistent with this loader. | |
|
2177
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|
2472 Handle SystemDictionary::find_method_handle_type(Symbol* signature, |
|
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|
2473 KlassHandle accessing_klass, |
|
1507
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diff
changeset
|
2474 TRAPS) { |
|
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|
2475 Handle empty; |
|
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|
2476 vmIntrinsics::ID null_iid = vmIntrinsics::_none; // distinct from all method handle invoker intrinsics |
|
1d7922586cf6
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|
2477 unsigned int hash = invoke_method_table()->compute_hash(signature, null_iid); |
|
1d7922586cf6
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|
2478 int index = invoke_method_table()->hash_to_index(hash); |
|
1d7922586cf6
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|
2479 SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, null_iid); |
|
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|
2480 if (spe != NULL && spe->method_type() != NULL) { |
|
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|
2481 assert(java_lang_invoke_MethodType::is_instance(spe->method_type()), ""); |
|
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|
2482 return Handle(THREAD, spe->method_type()); |
|
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|
2483 } else if (THREAD->is_Compiler_thread()) { |
|
1d7922586cf6
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|
2484 warning("SystemDictionary::find_method_handle_type called from compiler thread"); // FIXME |
|
1d7922586cf6
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6217
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|
2485 return Handle(); // do not attempt from within compiler, unless it was cached |
|
1d7922586cf6
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6217
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|
2486 } |
|
1d7922586cf6
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|
2487 |
|
1508
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diff
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|
2488 Handle class_loader, protection_domain; |
|
2ffde6cfe049
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|
2489 bool is_on_bcp = true; // keep this true as long as we can materialize from the boot classloader |
|
2177
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diff
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|
2490 int npts = ArgumentCount(signature).size(); |
| 1142 | 2491 objArrayHandle pts = oopFactory::new_objArray(SystemDictionary::Class_klass(), npts, CHECK_(empty)); |
| 710 | 2492 int arg = 0; |
| 2493 Handle rt; // the return type from the signature | |
|
2177
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|
2494 ResourceMark rm(THREAD); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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diff
changeset
|
2495 for (SignatureStream ss(signature); !ss.is_done(); ss.next()) { |
|
1508
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6939196: method handle signatures off the boot class path get linkage errors
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1507
diff
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|
2496 oop mirror = NULL; |
|
2ffde6cfe049
6939196: method handle signatures off the boot class path get linkage errors
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1507
diff
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|
2497 if (is_on_bcp) { |
|
6266
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|
2498 // Note: class_loader & protection_domain are both null at this point. |
|
1508
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1507
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|
2499 mirror = ss.as_java_mirror(class_loader, protection_domain, |
|
2ffde6cfe049
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|
2500 SignatureStream::ReturnNull, CHECK_(empty)); |
|
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|
2501 if (mirror == NULL) { |
|
2ffde6cfe049
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diff
changeset
|
2502 // fall back from BCP to accessing_klass |
|
2ffde6cfe049
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1507
diff
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|
2503 if (accessing_klass.not_null()) { |
|
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|
2504 class_loader = Handle(THREAD, InstanceKlass::cast(accessing_klass())->class_loader()); |
|
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2505 protection_domain = Handle(THREAD, InstanceKlass::cast(accessing_klass())->protection_domain()); |
|
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|
2506 } |
|
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|
2507 is_on_bcp = false; |
|
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|
2508 } |
|
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|
2509 } |
|
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|
2510 if (!is_on_bcp) { |
|
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|
2511 // Resolve, throwing a real error if it doesn't work. |
|
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|
2512 mirror = ss.as_java_mirror(class_loader, protection_domain, |
|
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|
2513 SignatureStream::NCDFError, CHECK_(empty)); |
| 710 | 2514 } |
| 2515 if (ss.at_return_type()) | |
| 2516 rt = Handle(THREAD, mirror); | |
| 2517 else | |
| 2518 pts->obj_at_put(arg++, mirror); | |
|
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2519 |
|
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|
2520 // Check accessibility. |
|
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|
2521 if (ss.is_object() && accessing_klass.not_null()) { |
|
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|
2522 Klass* sel_klass = java_lang_Class::as_Klass(mirror); |
|
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2523 mirror = NULL; // safety |
|
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|
2524 // Emulate ConstantPool::verify_constant_pool_resolve. |
|
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|
2525 if (Klass::cast(sel_klass)->oop_is_objArray()) |
|
6831
d8ce2825b193
8000213: NPG: Should have renamed arrayKlass and typeArrayKlass
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6751
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changeset
|
2526 sel_klass = ObjArrayKlass::cast(sel_klass)->bottom_klass(); |
|
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|
2527 if (Klass::cast(sel_klass)->oop_is_instance()) { |
|
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|
2528 KlassHandle sel_kh(THREAD, sel_klass); |
|
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|
2529 LinkResolver::check_klass_accessability(accessing_klass, sel_kh, CHECK_(empty)); |
|
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|
2530 } |
|
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|
2531 } |
| 710 | 2532 } |
| 2533 assert(arg == npts, ""); | |
| 2534 | |
|
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|
2535 // call java.lang.invoke.MethodHandleNatives::findMethodType(Class rt, Class[] pts) -> MethodType |
| 710 | 2536 JavaCallArguments args(Handle(THREAD, rt())); |
| 2537 args.push_oop(pts()); | |
| 2538 JavaValue result(T_OBJECT); | |
| 2539 JavaCalls::call_static(&result, | |
|
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diff
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|
2540 SystemDictionary::MethodHandleNatives_klass(), |
|
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|
2541 vmSymbols::findMethodHandleType_name(), |
| 2460 | 2542 vmSymbols::findMethodHandleType_signature(), |
| 710 | 2543 &args, CHECK_(empty)); |
|
1793
d257356e35f0
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|
2544 Handle method_type(THREAD, (oop) result.get_jobject()); |
|
d257356e35f0
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|
2545 |
|
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|
2546 if (is_on_bcp) { |
|
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|
2547 // We can cache this MethodType inside the JVM. |
|
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|
2548 MutexLocker ml(SystemDictionary_lock, THREAD); |
|
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|
2549 spe = invoke_method_table()->find_entry(index, hash, signature, null_iid); |
|
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|
2550 if (spe == NULL) |
|
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|
2551 spe = invoke_method_table()->add_entry(index, hash, signature, null_iid); |
|
6725
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|
2552 if (spe->method_type() == NULL) { |
|
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|
2553 spe->set_method_type(method_type()); |
|
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d257356e35f0
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|
2554 } |
|
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|
2555 } |
|
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|
2556 |
|
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|
2557 // report back to the caller with the MethodType |
|
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|
2558 return method_type; |
| 710 | 2559 } |
| 2560 | |
| 1602 | 2561 // Ask Java code to find or construct a method handle constant. |
| 2562 Handle SystemDictionary::link_method_handle_constant(KlassHandle caller, | |
| 2563 int ref_kind, //e.g., JVM_REF_invokeVirtual | |
| 2564 KlassHandle callee, | |
|
2177
3582bf76420e
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diff
changeset
|
2565 Symbol* name_sym, |
|
3582bf76420e
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diff
changeset
|
2566 Symbol* signature, |
| 1602 | 2567 TRAPS) { |
| 2568 Handle empty; | |
|
2177
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diff
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|
2569 Handle name = java_lang_String::create_from_symbol(name_sym, CHECK_(empty)); |
| 1602 | 2570 Handle type; |
| 2571 if (signature->utf8_length() > 0 && signature->byte_at(0) == '(') { | |
|
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|
2572 type = find_method_handle_type(signature, caller, CHECK_(empty)); |
| 1602 | 2573 } else { |
|
2177
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diff
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|
2574 ResourceMark rm(THREAD); |
|
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diff
changeset
|
2575 SignatureStream ss(signature, false); |
| 1602 | 2576 if (!ss.is_done()) { |
| 2577 oop mirror = ss.as_java_mirror(caller->class_loader(), caller->protection_domain(), | |
| 2578 SignatureStream::NCDFError, CHECK_(empty)); | |
| 2579 type = Handle(THREAD, mirror); | |
| 2580 ss.next(); | |
| 2581 if (!ss.is_done()) type = Handle(); // error! | |
| 2582 } | |
| 2583 } | |
| 2584 if (type.is_null()) { | |
| 2585 THROW_MSG_(vmSymbols::java_lang_LinkageError(), "bad signature", empty); | |
| 2586 } | |
| 2587 | |
|
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diff
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|
2588 // call java.lang.invoke.MethodHandleNatives::linkMethodHandleConstant(Class caller, int refKind, Class callee, String name, Object type) -> MethodHandle |
| 1602 | 2589 JavaCallArguments args; |
| 2590 args.push_oop(caller->java_mirror()); // the referring class | |
| 2591 args.push_int(ref_kind); | |
| 2592 args.push_oop(callee->java_mirror()); // the target class | |
| 2593 args.push_oop(name()); | |
| 2594 args.push_oop(type()); | |
| 2595 JavaValue result(T_OBJECT); | |
| 2596 JavaCalls::call_static(&result, | |
| 2597 SystemDictionary::MethodHandleNatives_klass(), | |
| 2598 vmSymbols::linkMethodHandleConstant_name(), | |
| 2460 | 2599 vmSymbols::linkMethodHandleConstant_signature(), |
| 1602 | 2600 &args, CHECK_(empty)); |
| 2601 return Handle(THREAD, (oop) result.get_jobject()); | |
| 2602 } | |
| 710 | 2603 |
|
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|
2604 // Ask Java code to find or construct a java.lang.invoke.CallSite for the given |
|
726
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diff
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|
2605 // name and signature, as interpreted relative to the given class loader. |
|
6266
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|
2606 methodHandle SystemDictionary::find_dynamic_call_site_invoker(KlassHandle caller, |
|
1d7922586cf6
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|
2607 Handle bootstrap_specifier, |
|
1d7922586cf6
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diff
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|
2608 Symbol* name, |
|
1d7922586cf6
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diff
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|
2609 Symbol* type, |
|
1d7922586cf6
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6217
diff
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|
2610 Handle* appendix_result, |
|
1d7922586cf6
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6217
diff
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|
2611 TRAPS) { |
|
1d7922586cf6
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6217
diff
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|
2612 methodHandle empty; |
|
1d7922586cf6
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6217
diff
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|
2613 Handle bsm, info; |
|
1d7922586cf6
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diff
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|
2614 if (java_lang_invoke_MethodHandle::is_instance(bootstrap_specifier())) { |
|
1d7922586cf6
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|
2615 bsm = bootstrap_specifier; |
|
1d7922586cf6
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6217
diff
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|
2616 } else { |
|
1d7922586cf6
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diff
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|
2617 assert(bootstrap_specifier->is_objArray(), ""); |
|
1d7922586cf6
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twisti
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6217
diff
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|
2618 objArrayHandle args(THREAD, (objArrayOop) bootstrap_specifier()); |
|
1d7922586cf6
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6217
diff
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|
2619 int len = args->length(); |
|
1d7922586cf6
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6217
diff
changeset
|
2620 assert(len >= 1, ""); |
|
1d7922586cf6
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6217
diff
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|
2621 bsm = Handle(THREAD, args->obj_at(0)); |
|
1d7922586cf6
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6217
diff
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|
2622 if (len > 1) { |
|
1d7922586cf6
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6217
diff
changeset
|
2623 objArrayOop args1 = oopFactory::new_objArray(SystemDictionary::Object_klass(), len-1, CHECK_(empty)); |
|
1d7922586cf6
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6217
diff
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|
2624 for (int i = 1; i < len; i++) |
|
1d7922586cf6
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6217
diff
changeset
|
2625 args1->obj_at_put(i-1, args->obj_at(i)); |
|
1d7922586cf6
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|
2626 info = Handle(THREAD, args1); |
|
1d7922586cf6
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6217
diff
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|
2627 } |
|
1d7922586cf6
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6217
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|
2628 } |
|
1d7922586cf6
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6217
diff
changeset
|
2629 guarantee(java_lang_invoke_MethodHandle::is_instance(bsm()), |
|
1660
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
parents:
1602
diff
changeset
|
2630 "caller must supply a valid BSM"); |
|
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
changeset
|
2631 |
|
6266
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|
2632 Handle method_name = java_lang_String::create_from_symbol(name, CHECK_(empty)); |
|
1d7922586cf6
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6217
diff
changeset
|
2633 Handle method_type = find_method_handle_type(type, caller, CHECK_(empty)); |
|
1d7922586cf6
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6217
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|
2634 |
|
1d7922586cf6
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diff
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|
2635 objArrayHandle appendix_box = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1, CHECK_(empty)); |
|
1d7922586cf6
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|
2636 assert(appendix_box->obj_at(0) == NULL, ""); |
|
1d7922586cf6
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6217
diff
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|
2637 |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
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6217
diff
changeset
|
2638 // call java.lang.invoke.MethodHandleNatives::linkCallSite(caller, bsm, name, mtype, info, &appendix) |
|
1d7922586cf6
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6217
diff
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|
2639 JavaCallArguments args; |
|
1d7922586cf6
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6217
diff
changeset
|
2640 args.push_oop(caller->java_mirror()); |
|
1d7922586cf6
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6217
diff
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|
2641 args.push_oop(bsm()); |
|
1d7922586cf6
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diff
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|
2642 args.push_oop(method_name()); |
|
1d7922586cf6
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6217
diff
changeset
|
2643 args.push_oop(method_type()); |
|
1507
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1339
diff
changeset
|
2644 args.push_oop(info()); |
|
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6217
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|
2645 args.push_oop(appendix_box); |
|
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|
2646 JavaValue result(T_OBJECT); |
|
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diff
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|
2647 JavaCalls::call_static(&result, |
|
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diff
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|
2648 SystemDictionary::MethodHandleNatives_klass(), |
|
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|
2649 vmSymbols::linkCallSite_name(), |
|
1d7922586cf6
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twisti
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6217
diff
changeset
|
2650 vmSymbols::linkCallSite_signature(), |
|
726
be93aad57795
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diff
changeset
|
2651 &args, CHECK_(empty)); |
|
6266
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6217
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|
2652 Handle mname(THREAD, (oop) result.get_jobject()); |
|
1d7922586cf6
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twisti
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6217
diff
changeset
|
2653 return unpack_method_and_appendix(mname, appendix_box, appendix_result, THREAD); |
|
726
be93aad57795
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710
diff
changeset
|
2654 } |
|
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diff
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|
2655 |
| 0 | 2656 // Since the identity hash code for symbols changes when the symbols are |
| 2657 // moved from the regular perm gen (hash in the mark word) to the shared | |
| 2658 // spaces (hash is the address), the classes loaded into the dictionary | |
| 2659 // may be in the wrong buckets. | |
| 2660 | |
| 2661 void SystemDictionary::reorder_dictionary() { | |
| 2662 dictionary()->reorder_dictionary(); | |
| 2663 } | |
| 2664 | |
| 2665 | |
| 2666 void SystemDictionary::copy_buckets(char** top, char* end) { | |
| 2667 dictionary()->copy_buckets(top, end); | |
| 2668 } | |
| 2669 | |
| 2670 | |
| 2671 void SystemDictionary::copy_table(char** top, char* end) { | |
| 2672 dictionary()->copy_table(top, end); | |
| 2673 } | |
| 2674 | |
| 2675 | |
| 2676 void SystemDictionary::reverse() { | |
| 2677 dictionary()->reverse(); | |
| 2678 } | |
| 2679 | |
| 2680 int SystemDictionary::number_of_classes() { | |
| 2681 return dictionary()->number_of_entries(); | |
| 2682 } | |
| 2683 | |
| 2684 | |
| 2685 // ---------------------------------------------------------------------------- | |
| 2686 #ifndef PRODUCT | |
| 2687 | |
| 2688 void SystemDictionary::print() { | |
| 2689 dictionary()->print(); | |
| 2690 | |
| 2691 // Placeholders | |
| 2692 GCMutexLocker mu(SystemDictionary_lock); | |
| 2693 placeholders()->print(); | |
| 2694 | |
| 2695 // loader constraints - print under SD_lock | |
| 2696 constraints()->print(); | |
| 2697 } | |
| 2698 | |
| 2699 #endif | |
| 2700 | |
| 2701 void SystemDictionary::verify() { | |
| 2702 guarantee(dictionary() != NULL, "Verify of system dictionary failed"); | |
| 2703 guarantee(constraints() != NULL, | |
| 2704 "Verify of loader constraints failed"); | |
| 2705 guarantee(dictionary()->number_of_entries() >= 0 && | |
| 2706 placeholders()->number_of_entries() >= 0, | |
| 2707 "Verify of system dictionary failed"); | |
| 2708 | |
| 2709 // Verify dictionary | |
| 2710 dictionary()->verify(); | |
| 2711 | |
| 2712 GCMutexLocker mu(SystemDictionary_lock); | |
| 2713 placeholders()->verify(); | |
| 2714 | |
| 2715 // Verify constraint table | |
| 2716 guarantee(constraints() != NULL, "Verify of loader constraints failed"); | |
|
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2717 constraints()->verify(dictionary(), placeholders()); |
| 0 | 2718 } |
| 2719 | |
| 2720 | |
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2721 void SystemDictionary::verify_obj_klass_present(Symbol* class_name, |
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2722 ClassLoaderData* loader_data) { |
| 0 | 2723 GCMutexLocker mu(SystemDictionary_lock); |
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2724 Symbol* name; |
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2725 |
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2726 Klass* probe = find_class(class_name, loader_data); |
| 0 | 2727 if (probe == NULL) { |
| 2728 probe = SystemDictionary::find_shared_class(class_name); | |
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2729 if (probe == NULL) { |
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2730 name = find_placeholder(class_name, loader_data); |
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2731 } |
| 0 | 2732 } |
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2733 guarantee(probe != NULL || name != NULL, |
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2734 "Loaded klasses should be in SystemDictionary"); |
| 0 | 2735 } |
| 2736 | |
| 2737 #ifndef PRODUCT | |
| 2738 | |
| 2739 // statistics code | |
| 2740 class ClassStatistics: AllStatic { | |
| 2741 private: | |
| 2742 static int nclasses; // number of classes | |
| 2743 static int nmethods; // number of methods | |
| 2744 static int nmethoddata; // number of methodData | |
| 2745 static int class_size; // size of class objects in words | |
| 2746 static int method_size; // size of method objects in words | |
| 2747 static int debug_size; // size of debug info in methods | |
| 2748 static int methoddata_size; // size of methodData objects in words | |
| 2749 | |
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2750 static void do_class(Klass* k) { |
| 0 | 2751 nclasses++; |
| 2752 class_size += k->size(); | |
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2753 if (k->oop_is_instance()) { |
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2754 InstanceKlass* ik = (InstanceKlass*)k; |
| 0 | 2755 class_size += ik->methods()->size(); |
| 2756 class_size += ik->constants()->size(); | |
| 2757 class_size += ik->local_interfaces()->size(); | |
| 2758 class_size += ik->transitive_interfaces()->size(); | |
| 2759 // We do not have to count implementors, since we only store one! | |
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2760 // SSS: How should these be accounted now that they have moved? |
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2761 // class_size += ik->fields()->length(); |
| 0 | 2762 } |
| 2763 } | |
| 2764 | |
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2765 static void do_method(Method* m) { |
| 0 | 2766 nmethods++; |
| 2767 method_size += m->size(); | |
| 2768 // class loader uses same objArray for empty vectors, so don't count these | |
| 2769 if (m->has_stackmap_table()) { | |
| 2770 method_size += m->stackmap_data()->size(); | |
| 2771 } | |
| 2772 | |
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2773 MethodData* mdo = m->method_data(); |
| 0 | 2774 if (mdo != NULL) { |
| 2775 nmethoddata++; | |
| 2776 methoddata_size += mdo->size(); | |
| 2777 } | |
| 2778 } | |
| 2779 | |
| 2780 public: | |
| 2781 static void print() { | |
| 2782 SystemDictionary::classes_do(do_class); | |
| 2783 SystemDictionary::methods_do(do_method); | |
| 2784 tty->print_cr("Class statistics:"); | |
| 2785 tty->print_cr("%d classes (%d bytes)", nclasses, class_size * oopSize); | |
| 2786 tty->print_cr("%d methods (%d bytes = %d base + %d debug info)", nmethods, | |
| 2787 (method_size + debug_size) * oopSize, method_size * oopSize, debug_size * oopSize); | |
| 2788 tty->print_cr("%d methoddata (%d bytes)", nmethoddata, methoddata_size * oopSize); | |
| 2789 } | |
| 2790 }; | |
| 2791 | |
| 2792 | |
| 2793 int ClassStatistics::nclasses = 0; | |
| 2794 int ClassStatistics::nmethods = 0; | |
| 2795 int ClassStatistics::nmethoddata = 0; | |
| 2796 int ClassStatistics::class_size = 0; | |
| 2797 int ClassStatistics::method_size = 0; | |
| 2798 int ClassStatistics::debug_size = 0; | |
| 2799 int ClassStatistics::methoddata_size = 0; | |
| 2800 | |
| 2801 void SystemDictionary::print_class_statistics() { | |
| 2802 ResourceMark rm; | |
| 2803 ClassStatistics::print(); | |
| 2804 } | |
| 2805 | |
| 2806 | |
| 2807 class MethodStatistics: AllStatic { | |
| 2808 public: | |
| 2809 enum { | |
| 2810 max_parameter_size = 10 | |
| 2811 }; | |
| 2812 private: | |
| 2813 | |
| 2814 static int _number_of_methods; | |
| 2815 static int _number_of_final_methods; | |
| 2816 static int _number_of_static_methods; | |
| 2817 static int _number_of_native_methods; | |
| 2818 static int _number_of_synchronized_methods; | |
| 2819 static int _number_of_profiled_methods; | |
| 2820 static int _number_of_bytecodes; | |
| 2821 static int _parameter_size_profile[max_parameter_size]; | |
| 2822 static int _bytecodes_profile[Bytecodes::number_of_java_codes]; | |
| 2823 | |
| 2824 static void initialize() { | |
| 2825 _number_of_methods = 0; | |
| 2826 _number_of_final_methods = 0; | |
| 2827 _number_of_static_methods = 0; | |
| 2828 _number_of_native_methods = 0; | |
| 2829 _number_of_synchronized_methods = 0; | |
| 2830 _number_of_profiled_methods = 0; | |
| 2831 _number_of_bytecodes = 0; | |
| 2832 for (int i = 0; i < max_parameter_size ; i++) _parameter_size_profile[i] = 0; | |
| 2833 for (int j = 0; j < Bytecodes::number_of_java_codes; j++) _bytecodes_profile [j] = 0; | |
| 2834 }; | |
| 2835 | |
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2836 static void do_method(Method* m) { |
| 0 | 2837 _number_of_methods++; |
| 2838 // collect flag info | |
| 2839 if (m->is_final() ) _number_of_final_methods++; | |
| 2840 if (m->is_static() ) _number_of_static_methods++; | |
| 2841 if (m->is_native() ) _number_of_native_methods++; | |
| 2842 if (m->is_synchronized()) _number_of_synchronized_methods++; | |
| 2843 if (m->method_data() != NULL) _number_of_profiled_methods++; | |
| 2844 // collect parameter size info (add one for receiver, if any) | |
| 2845 _parameter_size_profile[MIN2(m->size_of_parameters() + (m->is_static() ? 0 : 1), max_parameter_size - 1)]++; | |
| 2846 // collect bytecodes info | |
| 2847 { | |
| 2848 Thread *thread = Thread::current(); | |
| 2849 HandleMark hm(thread); | |
| 2850 BytecodeStream s(methodHandle(thread, m)); | |
| 2851 Bytecodes::Code c; | |
| 2852 while ((c = s.next()) >= 0) { | |
| 2853 _number_of_bytecodes++; | |
| 2854 _bytecodes_profile[c]++; | |
| 2855 } | |
| 2856 } | |
| 2857 } | |
| 2858 | |
| 2859 public: | |
| 2860 static void print() { | |
| 2861 initialize(); | |
| 2862 SystemDictionary::methods_do(do_method); | |
| 2863 // generate output | |
| 2864 tty->cr(); | |
| 2865 tty->print_cr("Method statistics (static):"); | |
| 2866 // flag distribution | |
| 2867 tty->cr(); | |
| 2868 tty->print_cr("%6d final methods %6.1f%%", _number_of_final_methods , _number_of_final_methods * 100.0F / _number_of_methods); | |
| 2869 tty->print_cr("%6d static methods %6.1f%%", _number_of_static_methods , _number_of_static_methods * 100.0F / _number_of_methods); | |
| 2870 tty->print_cr("%6d native methods %6.1f%%", _number_of_native_methods , _number_of_native_methods * 100.0F / _number_of_methods); | |
| 2871 tty->print_cr("%6d synchronized methods %6.1f%%", _number_of_synchronized_methods, _number_of_synchronized_methods * 100.0F / _number_of_methods); | |
| 2872 tty->print_cr("%6d profiled methods %6.1f%%", _number_of_profiled_methods, _number_of_profiled_methods * 100.0F / _number_of_methods); | |
| 2873 // parameter size profile | |
| 2874 tty->cr(); | |
| 2875 { int tot = 0; | |
| 2876 int avg = 0; | |
| 2877 for (int i = 0; i < max_parameter_size; i++) { | |
| 2878 int n = _parameter_size_profile[i]; | |
| 2879 tot += n; | |
| 2880 avg += n*i; | |
| 2881 tty->print_cr("parameter size = %1d: %6d methods %5.1f%%", i, n, n * 100.0F / _number_of_methods); | |
| 2882 } | |
| 2883 assert(tot == _number_of_methods, "should be the same"); | |
| 2884 tty->print_cr(" %6d methods 100.0%%", _number_of_methods); | |
| 2885 tty->print_cr("(average parameter size = %3.1f including receiver, if any)", (float)avg / _number_of_methods); | |
| 2886 } | |
| 2887 // bytecodes profile | |
| 2888 tty->cr(); | |
| 2889 { int tot = 0; | |
| 2890 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) { | |
| 2891 if (Bytecodes::is_defined(i)) { | |
| 2892 Bytecodes::Code c = Bytecodes::cast(i); | |
| 2893 int n = _bytecodes_profile[c]; | |
| 2894 tot += n; | |
| 2895 tty->print_cr("%9d %7.3f%% %s", n, n * 100.0F / _number_of_bytecodes, Bytecodes::name(c)); | |
| 2896 } | |
| 2897 } | |
| 2898 assert(tot == _number_of_bytecodes, "should be the same"); | |
| 2899 tty->print_cr("%9d 100.000%%", _number_of_bytecodes); | |
| 2900 } | |
| 2901 tty->cr(); | |
| 2902 } | |
| 2903 }; | |
| 2904 | |
| 2905 int MethodStatistics::_number_of_methods; | |
| 2906 int MethodStatistics::_number_of_final_methods; | |
| 2907 int MethodStatistics::_number_of_static_methods; | |
| 2908 int MethodStatistics::_number_of_native_methods; | |
| 2909 int MethodStatistics::_number_of_synchronized_methods; | |
| 2910 int MethodStatistics::_number_of_profiled_methods; | |
| 2911 int MethodStatistics::_number_of_bytecodes; | |
| 2912 int MethodStatistics::_parameter_size_profile[MethodStatistics::max_parameter_size]; | |
| 2913 int MethodStatistics::_bytecodes_profile[Bytecodes::number_of_java_codes]; | |
| 2914 | |
| 2915 | |
| 2916 void SystemDictionary::print_method_statistics() { | |
| 2917 MethodStatistics::print(); | |
| 2918 } | |
| 2919 | |
| 2920 #endif // PRODUCT |