Mercurial > hg > truffle
annotate src/share/vm/classfile/systemDictionary.cpp @ 20762:c2844108a708
Merge
| author | asaha |
|---|---|
| date | Thu, 23 Oct 2014 12:02:08 -0700 |
| parents | 13dbe89e447c 01dcaba9b3f3 |
| children | 02c7eebe5f52 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2014, 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" | |
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33 #if INCLUDE_CDS |
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34 #include "classfile/sharedClassUtil.hpp" |
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35 #include "classfile/systemDictionaryShared.hpp" |
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36 #endif |
| 1972 | 37 #include "classfile/vmSymbols.hpp" |
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38 #include "compiler/compileBroker.hpp" |
| 1972 | 39 #include "interpreter/bytecodeStream.hpp" |
| 40 #include "interpreter/interpreter.hpp" | |
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41 #include "memory/filemap.hpp" |
| 1972 | 42 #include "memory/gcLocker.hpp" |
| 43 #include "memory/oopFactory.hpp" | |
| 44 #include "oops/instanceKlass.hpp" | |
| 45 #include "oops/instanceRefKlass.hpp" | |
| 46 #include "oops/klass.inline.hpp" | |
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47 #include "oops/methodData.hpp" |
| 1972 | 48 #include "oops/objArrayKlass.hpp" |
| 49 #include "oops/oop.inline.hpp" | |
| 50 #include "oops/oop.inline2.hpp" | |
| 51 #include "oops/typeArrayKlass.hpp" | |
| 52 #include "prims/jvmtiEnvBase.hpp" | |
| 53 #include "prims/methodHandles.hpp" | |
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54 #include "runtime/arguments.hpp" |
| 1972 | 55 #include "runtime/biasedLocking.hpp" |
| 56 #include "runtime/fieldType.hpp" | |
| 57 #include "runtime/handles.inline.hpp" | |
| 58 #include "runtime/java.hpp" | |
| 59 #include "runtime/javaCalls.hpp" | |
| 60 #include "runtime/mutexLocker.hpp" | |
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61 #include "runtime/orderAccess.inline.hpp" |
| 1972 | 62 #include "runtime/signature.hpp" |
| 63 #include "services/classLoadingService.hpp" | |
| 64 #include "services/threadService.hpp" | |
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65 #include "utilities/macros.hpp" |
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66 #include "utilities/ticks.hpp" |
| 0 | 67 |
| 10405 | 68 #if INCLUDE_TRACE |
| 69 #include "trace/tracing.hpp" | |
| 70 #endif | |
| 71 | |
| 1903 | 72 Dictionary* SystemDictionary::_dictionary = NULL; |
| 73 PlaceholderTable* SystemDictionary::_placeholders = NULL; | |
| 74 Dictionary* SystemDictionary::_shared_dictionary = NULL; | |
| 75 LoaderConstraintTable* SystemDictionary::_loader_constraints = NULL; | |
| 76 ResolutionErrorTable* SystemDictionary::_resolution_errors = NULL; | |
| 77 SymbolPropertyTable* SystemDictionary::_invoke_method_table = NULL; | |
| 0 | 78 |
| 79 | |
| 80 int SystemDictionary::_number_of_modifications = 0; | |
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81 int SystemDictionary::_sdgeneration = 0; |
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82 const int SystemDictionary::_primelist[_prime_array_size] = {1009,2017,4049,5051,10103, |
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83 20201,40423,99991}; |
| 0 | 84 |
| 85 oop SystemDictionary::_system_loader_lock_obj = NULL; | |
| 86 | |
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87 Klass* SystemDictionary::_well_known_klasses[SystemDictionary::WKID_LIMIT] |
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88 = { NULL /*, NULL...*/ }; |
| 0 | 89 |
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90 Klass* SystemDictionary::_box_klasses[T_VOID+1] = { NULL /*, NULL...*/ }; |
| 0 | 91 |
| 92 oop SystemDictionary::_java_system_loader = NULL; | |
| 93 | |
| 94 bool SystemDictionary::_has_loadClassInternal = false; | |
| 95 bool SystemDictionary::_has_checkPackageAccess = false; | |
| 96 | |
| 97 // lazily initialized klass variables | |
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98 Klass* volatile SystemDictionary::_abstract_ownable_synchronizer_klass = NULL; |
| 0 | 99 |
| 100 | |
| 101 // ---------------------------------------------------------------------------- | |
| 102 // Java-level SystemLoader | |
| 103 | |
| 104 oop SystemDictionary::java_system_loader() { | |
| 105 return _java_system_loader; | |
| 106 } | |
| 107 | |
| 108 void SystemDictionary::compute_java_system_loader(TRAPS) { | |
| 1142 | 109 KlassHandle system_klass(THREAD, WK_KLASS(ClassLoader_klass)); |
| 0 | 110 JavaValue result(T_OBJECT); |
| 111 JavaCalls::call_static(&result, | |
| 1142 | 112 KlassHandle(THREAD, WK_KLASS(ClassLoader_klass)), |
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113 vmSymbols::getSystemClassLoader_name(), |
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114 vmSymbols::void_classloader_signature(), |
| 0 | 115 CHECK); |
| 116 | |
| 117 _java_system_loader = (oop)result.get_jobject(); | |
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118 |
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119 CDS_ONLY(SystemDictionaryShared::initialize(CHECK);) |
| 0 | 120 } |
| 121 | |
| 122 | |
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123 ClassLoaderData* SystemDictionary::register_loader(Handle class_loader, TRAPS) { |
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124 if (class_loader() == NULL) return ClassLoaderData::the_null_class_loader_data(); |
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125 return ClassLoaderDataGraph::find_or_create(class_loader, CHECK_NULL); |
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126 } |
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127 |
| 0 | 128 // ---------------------------------------------------------------------------- |
| 129 // debugging | |
| 130 | |
| 131 #ifdef ASSERT | |
| 132 | |
| 133 // return true if class_name contains no '.' (internal format is '/') | |
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134 bool SystemDictionary::is_internal_format(Symbol* class_name) { |
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135 if (class_name != NULL) { |
| 0 | 136 ResourceMark rm; |
| 137 char* name = class_name->as_C_string(); | |
| 138 return strchr(name, '.') == NULL; | |
| 139 } else { | |
| 140 return true; | |
| 141 } | |
| 142 } | |
| 143 | |
| 144 #endif | |
| 145 | |
| 146 // ---------------------------------------------------------------------------- | |
| 514 | 147 // Parallel class loading check |
| 148 | |
| 149 bool SystemDictionary::is_parallelCapable(Handle class_loader) { | |
| 150 if (UnsyncloadClass || class_loader.is_null()) return true; | |
| 151 if (AlwaysLockClassLoader) return false; | |
| 3938 | 152 return java_lang_ClassLoader::parallelCapable(class_loader()); |
| 514 | 153 } |
| 154 // ---------------------------------------------------------------------------- | |
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155 // ParallelDefineClass flag does not apply to bootclass loader |
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156 bool SystemDictionary::is_parallelDefine(Handle class_loader) { |
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157 if (class_loader.is_null()) return false; |
| 3938 | 158 if (AllowParallelDefineClass && java_lang_ClassLoader::parallelCapable(class_loader())) { |
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159 return true; |
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160 } |
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161 return false; |
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162 } |
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163 |
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164 /** |
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165 * Returns true if the passed class loader is the extension class loader. |
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166 */ |
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167 bool SystemDictionary::is_ext_class_loader(Handle class_loader) { |
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168 if (class_loader.is_null()) { |
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169 return false; |
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170 } |
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171 return (class_loader->klass()->name() == vmSymbols::sun_misc_Launcher_ExtClassLoader()); |
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172 } |
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173 |
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174 // ---------------------------------------------------------------------------- |
| 0 | 175 // Resolving of classes |
| 176 | |
| 177 // Forwards to resolve_or_null | |
| 178 | |
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179 Klass* SystemDictionary::resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS) { |
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180 Klass* klass = resolve_or_null(class_name, class_loader, protection_domain, THREAD); |
| 0 | 181 if (HAS_PENDING_EXCEPTION || klass == NULL) { |
| 182 KlassHandle k_h(THREAD, klass); | |
| 183 // can return a null klass | |
| 184 klass = handle_resolution_exception(class_name, class_loader, protection_domain, throw_error, k_h, THREAD); | |
| 185 } | |
| 186 return klass; | |
| 187 } | |
| 188 | |
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189 Klass* SystemDictionary::handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS) { |
| 0 | 190 if (HAS_PENDING_EXCEPTION) { |
| 191 // If we have a pending exception we forward it to the caller, unless throw_error is true, | |
| 192 // in which case we have to check whether the pending exception is a ClassNotFoundException, | |
| 193 // and if so convert it to a NoClassDefFoundError | |
| 194 // And chain the original ClassNotFoundException | |
| 1142 | 195 if (throw_error && PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass())) { |
| 0 | 196 ResourceMark rm(THREAD); |
| 197 assert(klass_h() == NULL, "Should not have result with exception pending"); | |
| 198 Handle e(THREAD, PENDING_EXCEPTION); | |
| 199 CLEAR_PENDING_EXCEPTION; | |
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200 THROW_MSG_CAUSE_NULL(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string(), e); |
| 0 | 201 } else { |
| 202 return NULL; | |
| 203 } | |
| 204 } | |
| 205 // Class not found, throw appropriate error or exception depending on value of throw_error | |
| 206 if (klass_h() == NULL) { | |
| 207 ResourceMark rm(THREAD); | |
| 208 if (throw_error) { | |
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209 THROW_MSG_NULL(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string()); |
| 0 | 210 } else { |
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211 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), class_name->as_C_string()); |
| 0 | 212 } |
| 213 } | |
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214 return (Klass*)klass_h(); |
| 0 | 215 } |
| 216 | |
| 217 | |
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218 Klass* SystemDictionary::resolve_or_fail(Symbol* class_name, |
| 0 | 219 bool throw_error, TRAPS) |
| 220 { | |
| 221 return resolve_or_fail(class_name, Handle(), Handle(), throw_error, THREAD); | |
| 222 } | |
| 223 | |
| 224 | |
| 225 // Forwards to resolve_instance_class_or_null | |
| 226 | |
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227 Klass* SystemDictionary::resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS) { |
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228 assert(!THREAD->is_Compiler_thread(), |
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229 err_msg("can not load classes with compiler thread: class=%s, classloader=%s", |
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230 class_name->as_C_string(), |
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231 class_loader.is_null() ? "null" : class_loader->klass()->name()->as_C_string())); |
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232 if (FieldType::is_array(class_name)) { |
| 0 | 233 return resolve_array_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); |
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234 } else if (FieldType::is_obj(class_name)) { |
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235 ResourceMark rm(THREAD); |
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236 // Ignore wrapping L and ;. |
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237 TempNewSymbol name = SymbolTable::new_symbol(class_name->as_C_string() + 1, |
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238 class_name->utf8_length() - 2, CHECK_NULL); |
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239 return resolve_instance_class_or_null(name, class_loader, protection_domain, CHECK_NULL); |
| 0 | 240 } else { |
| 241 return resolve_instance_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); | |
| 242 } | |
| 243 } | |
| 244 | |
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245 Klass* SystemDictionary::resolve_or_null(Symbol* class_name, TRAPS) { |
| 0 | 246 return resolve_or_null(class_name, Handle(), Handle(), THREAD); |
| 247 } | |
| 248 | |
| 249 // Forwards to resolve_instance_class_or_null | |
| 250 | |
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251 Klass* SystemDictionary::resolve_array_class_or_null(Symbol* class_name, |
| 0 | 252 Handle class_loader, |
| 253 Handle protection_domain, | |
| 254 TRAPS) { | |
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255 assert(FieldType::is_array(class_name), "must be array"); |
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256 Klass* k = NULL; |
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257 FieldArrayInfo fd; |
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258 // dimension and object_key in FieldArrayInfo are assigned as a side-effect |
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259 // of this call |
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260 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_NULL); |
| 0 | 261 if (t == T_OBJECT) { |
| 262 // naked oop "k" is OK here -- we assign back into it | |
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263 k = SystemDictionary::resolve_instance_class_or_null(fd.object_key(), |
| 0 | 264 class_loader, |
| 265 protection_domain, | |
| 266 CHECK_NULL); | |
| 267 if (k != NULL) { | |
| 6983 | 268 k = k->array_klass(fd.dimension(), CHECK_NULL); |
| 0 | 269 } |
| 270 } else { | |
| 271 k = Universe::typeArrayKlassObj(t); | |
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272 k = TypeArrayKlass::cast(k)->array_klass(fd.dimension(), CHECK_NULL); |
| 0 | 273 } |
| 274 return k; | |
| 275 } | |
| 276 | |
| 277 | |
| 278 // Must be called for any super-class or super-interface resolution | |
| 279 // during class definition to allow class circularity checking | |
| 280 // super-interface callers: | |
| 281 // parse_interfaces - for defineClass & jvmtiRedefineClasses | |
| 282 // super-class callers: | |
| 283 // ClassFileParser - for defineClass & jvmtiRedefineClasses | |
| 284 // load_shared_class - while loading a class from shared archive | |
| 514 | 285 // resolve_instance_class_or_null: |
| 286 // via: handle_parallel_super_load | |
| 0 | 287 // when resolving a class that has an existing placeholder with |
| 288 // a saved superclass [i.e. a defineClass is currently in progress] | |
| 289 // if another thread is trying to resolve the class, it must do | |
| 290 // super-class checks on its own thread to catch class circularity | |
| 291 // This last call is critical in class circularity checking for cases | |
| 292 // where classloading is delegated to different threads and the | |
| 293 // classloader lock is released. | |
| 294 // Take the case: Base->Super->Base | |
| 295 // 1. If thread T1 tries to do a defineClass of class Base | |
| 296 // resolve_super_or_fail creates placeholder: T1, Base (super Super) | |
| 297 // 2. resolve_instance_class_or_null does not find SD or placeholder for Super | |
| 298 // so it tries to load Super | |
| 299 // 3. If we load the class internally, or user classloader uses same thread | |
| 300 // loadClassFromxxx or defineClass via parseClassFile Super ... | |
| 301 // 3.1 resolve_super_or_fail creates placeholder: T1, Super (super Base) | |
| 302 // 3.3 resolve_instance_class_or_null Base, finds placeholder for Base | |
| 303 // 3.4 calls resolve_super_or_fail Base | |
| 304 // 3.5 finds T1,Base -> throws class circularity | |
| 305 //OR 4. If T2 tries to resolve Super via defineClass Super ... | |
| 306 // 4.1 resolve_super_or_fail creates placeholder: T2, Super (super Base) | |
| 307 // 4.2 resolve_instance_class_or_null Base, finds placeholder for Base (super Super) | |
| 308 // 4.3 calls resolve_super_or_fail Super in parallel on own thread T2 | |
| 309 // 4.4 finds T2, Super -> throws class circularity | |
| 310 // Must be called, even if superclass is null, since this is | |
| 311 // where the placeholder entry is created which claims this | |
| 312 // thread is loading this class/classloader. | |
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313 Klass* SystemDictionary::resolve_super_or_fail(Symbol* child_name, |
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314 Symbol* class_name, |
| 0 | 315 Handle class_loader, |
| 316 Handle protection_domain, | |
| 317 bool is_superclass, | |
| 318 TRAPS) { | |
| 319 // Double-check, if child class is already loaded, just return super-class,interface | |
| 320 // Don't add a placedholder if already loaded, i.e. already in system dictionary | |
| 321 // Make sure there's a placeholder for the *child* before resolving. | |
| 322 // Used as a claim that this thread is currently loading superclass/classloader | |
| 323 // Used here for ClassCircularity checks and also for heap verification | |
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324 // (every InstanceKlass in the heap needs to be in the system dictionary |
| 0 | 325 // or have a placeholder). |
| 326 // Must check ClassCircularity before checking if super class is already loaded | |
| 327 // | |
| 328 // We might not already have a placeholder if this child_name was | |
| 329 // first seen via resolve_from_stream (jni_DefineClass or JVM_DefineClass); | |
| 330 // the name of the class might not be known until the stream is actually | |
| 331 // parsed. | |
| 332 // Bugs 4643874, 4715493 | |
| 333 // compute_hash can have a safepoint | |
| 334 | |
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335 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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336 unsigned int d_hash = dictionary()->compute_hash(child_name, loader_data); |
| 0 | 337 int d_index = dictionary()->hash_to_index(d_hash); |
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338 unsigned int p_hash = placeholders()->compute_hash(child_name, loader_data); |
| 0 | 339 int p_index = placeholders()->hash_to_index(p_hash); |
| 340 // can't throw error holding a lock | |
| 341 bool child_already_loaded = false; | |
| 342 bool throw_circularity_error = false; | |
| 343 { | |
| 344 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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345 Klass* childk = find_class(d_index, d_hash, child_name, loader_data); |
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346 Klass* quicksuperk; |
| 0 | 347 // to support // loading: if child done loading, just return superclass |
| 348 // if class_name, & class_loader don't match: | |
| 349 // if initial define, SD update will give LinkageError | |
| 350 // if redefine: compare_class_versions will give HIERARCHY_CHANGED | |
| 351 // so we don't throw an exception here. | |
| 352 // see: nsk redefclass014 & java.lang.instrument Instrument032 | |
| 353 if ((childk != NULL ) && (is_superclass) && | |
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354 ((quicksuperk = InstanceKlass::cast(childk)->super()) != NULL) && |
| 0 | 355 |
| 6983 | 356 ((quicksuperk->name() == class_name) && |
| 357 (quicksuperk->class_loader() == class_loader()))) { | |
| 0 | 358 return quicksuperk; |
| 359 } else { | |
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360 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, loader_data); |
| 0 | 361 if (probe && probe->check_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER)) { |
| 362 throw_circularity_error = true; | |
| 363 } | |
| 514 | 364 } |
| 365 if (!throw_circularity_error) { | |
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366 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, child_name, loader_data, PlaceholderTable::LOAD_SUPER, class_name, THREAD); |
| 0 | 367 } |
| 368 } | |
| 369 if (throw_circularity_error) { | |
| 370 ResourceMark rm(THREAD); | |
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371 THROW_MSG_NULL(vmSymbols::java_lang_ClassCircularityError(), child_name->as_C_string()); |
| 0 | 372 } |
| 373 | |
| 374 // java.lang.Object should have been found above | |
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375 assert(class_name != NULL, "null super class for resolving"); |
| 0 | 376 // Resolve the super class or interface, check results on return |
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377 Klass* superk = SystemDictionary::resolve_or_null(class_name, |
| 0 | 378 class_loader, |
| 379 protection_domain, | |
| 380 THREAD); | |
| 381 | |
| 382 KlassHandle superk_h(THREAD, superk); | |
| 383 | |
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384 // Clean up of placeholders moved so that each classloadAction registrar self-cleans up |
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385 // It is no longer necessary to keep the placeholder table alive until update_dictionary |
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386 // or error. GC used to walk the placeholder table as strong roots. |
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387 // The instanceKlass is kept alive because the class loader is on the stack, |
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388 // which keeps the loader_data alive, as well as all instanceKlasses in |
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389 // the loader_data. parseClassFile adds the instanceKlass to loader_data. |
| 0 | 390 { |
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391 MutexLocker mu(SystemDictionary_lock, THREAD); |
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392 placeholders()->find_and_remove(p_index, p_hash, child_name, loader_data, PlaceholderTable::LOAD_SUPER, THREAD); |
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393 SystemDictionary_lock->notify_all(); |
| 0 | 394 } |
| 395 if (HAS_PENDING_EXCEPTION || superk_h() == NULL) { | |
| 396 // can null superk | |
| 397 superk_h = KlassHandle(THREAD, handle_resolution_exception(class_name, class_loader, protection_domain, true, superk_h, THREAD)); | |
| 398 } | |
| 399 | |
| 400 return superk_h(); | |
| 401 } | |
| 402 | |
| 403 void SystemDictionary::validate_protection_domain(instanceKlassHandle klass, | |
| 404 Handle class_loader, | |
| 405 Handle protection_domain, | |
| 406 TRAPS) { | |
| 407 if(!has_checkPackageAccess()) return; | |
| 408 | |
| 409 // Now we have to call back to java to check if the initating class has access | |
| 410 JavaValue result(T_VOID); | |
| 411 if (TraceProtectionDomainVerification) { | |
| 412 // Print out trace information | |
| 413 tty->print_cr("Checking package access"); | |
| 414 tty->print(" - class loader: "); class_loader()->print_value_on(tty); tty->cr(); | |
| 415 tty->print(" - protection domain: "); protection_domain()->print_value_on(tty); tty->cr(); | |
| 416 tty->print(" - loading: "); klass()->print_value_on(tty); tty->cr(); | |
| 417 } | |
| 418 | |
| 1142 | 419 KlassHandle system_loader(THREAD, SystemDictionary::ClassLoader_klass()); |
| 0 | 420 JavaCalls::call_special(&result, |
| 421 class_loader, | |
| 422 system_loader, | |
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423 vmSymbols::checkPackageAccess_name(), |
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424 vmSymbols::class_protectiondomain_signature(), |
| 0 | 425 Handle(THREAD, klass->java_mirror()), |
| 426 protection_domain, | |
| 427 THREAD); | |
| 428 | |
| 429 if (TraceProtectionDomainVerification) { | |
| 430 if (HAS_PENDING_EXCEPTION) { | |
| 431 tty->print_cr(" -> DENIED !!!!!!!!!!!!!!!!!!!!!"); | |
| 432 } else { | |
| 433 tty->print_cr(" -> granted"); | |
| 434 } | |
| 435 tty->cr(); | |
| 436 } | |
| 437 | |
| 438 if (HAS_PENDING_EXCEPTION) return; | |
| 439 | |
| 440 // If no exception has been thrown, we have validated the protection domain | |
| 441 // Insert the protection domain of the initiating class into the set. | |
| 442 { | |
| 443 // We recalculate the entry here -- we've called out to java since | |
| 444 // the last time it was calculated. | |
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445 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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446 |
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447 Symbol* kn = klass->name(); |
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448 unsigned int d_hash = dictionary()->compute_hash(kn, loader_data); |
| 0 | 449 int d_index = dictionary()->hash_to_index(d_hash); |
| 450 | |
| 451 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 452 { | |
| 453 // Note that we have an entry, and entries can be deleted only during GC, | |
| 454 // so we cannot allow GC to occur while we're holding this entry. | |
| 455 | |
| 456 // We're using a No_Safepoint_Verifier to catch any place where we | |
| 457 // might potentially do a GC at all. | |
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458 // Dictionary::do_unloading() asserts that classes in SD are only |
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459 // unloaded at a safepoint. Anonymous classes are not in SD. |
| 0 | 460 No_Safepoint_Verifier nosafepoint; |
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461 dictionary()->add_protection_domain(d_index, d_hash, klass, loader_data, |
| 0 | 462 protection_domain, THREAD); |
| 463 } | |
| 464 } | |
| 465 } | |
| 466 | |
| 467 // We only get here if this thread finds that another thread | |
| 468 // has already claimed the placeholder token for the current operation, | |
| 469 // but that other thread either never owned or gave up the | |
| 470 // object lock | |
| 471 // Waits on SystemDictionary_lock to indicate placeholder table updated | |
| 472 // On return, caller must recheck placeholder table state | |
| 473 // | |
| 474 // We only get here if | |
| 475 // 1) custom classLoader, i.e. not bootstrap classloader | |
| 476 // 2) UnsyncloadClass not set | |
| 477 // 3) custom classLoader has broken the class loader objectLock | |
| 478 // so another thread got here in parallel | |
| 479 // | |
| 480 // lockObject must be held. | |
| 481 // Complicated dance due to lock ordering: | |
| 482 // Must first release the classloader object lock to | |
| 483 // allow initial definer to complete the class definition | |
| 484 // and to avoid deadlock | |
| 485 // Reclaim classloader lock object with same original recursion count | |
| 486 // Must release SystemDictionary_lock after notify, since | |
| 487 // class loader lock must be claimed before SystemDictionary_lock | |
| 488 // to prevent deadlocks | |
| 489 // | |
| 490 // The notify allows applications that did an untimed wait() on | |
| 491 // the classloader object lock to not hang. | |
| 492 void SystemDictionary::double_lock_wait(Handle lockObject, TRAPS) { | |
| 493 assert_lock_strong(SystemDictionary_lock); | |
| 494 | |
| 495 bool calledholdinglock | |
| 496 = ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, lockObject); | |
| 497 assert(calledholdinglock,"must hold lock for notify"); | |
| 514 | 498 assert((!(lockObject() == _system_loader_lock_obj) && !is_parallelCapable(lockObject)), "unexpected double_lock_wait"); |
| 0 | 499 ObjectSynchronizer::notifyall(lockObject, THREAD); |
| 500 intptr_t recursions = ObjectSynchronizer::complete_exit(lockObject, THREAD); | |
| 501 SystemDictionary_lock->wait(); | |
| 502 SystemDictionary_lock->unlock(); | |
| 503 ObjectSynchronizer::reenter(lockObject, recursions, THREAD); | |
| 504 SystemDictionary_lock->lock(); | |
| 505 } | |
| 506 | |
| 507 // If the class in is in the placeholder table, class loading is in progress | |
| 508 // For cases where the application changes threads to load classes, it | |
| 509 // is critical to ClassCircularity detection that we try loading | |
| 510 // the superclass on the same thread internally, so we do parallel | |
| 511 // super class loading here. | |
| 512 // This also is critical in cases where the original thread gets stalled | |
| 513 // even in non-circularity situations. | |
| 514 // Note: must call resolve_super_or_fail even if null super - | |
| 514 | 515 // to force placeholder entry creation for this class for circularity detection |
| 0 | 516 // Caller must check for pending exception |
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517 // Returns non-null Klass* if other thread has completed load |
| 0 | 518 // and we are done, |
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519 // If return null Klass* and no pending exception, the caller must load the class |
| 0 | 520 instanceKlassHandle SystemDictionary::handle_parallel_super_load( |
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521 Symbol* name, Symbol* superclassname, Handle class_loader, |
| 0 | 522 Handle protection_domain, Handle lockObject, TRAPS) { |
| 523 | |
| 524 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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525 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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526 unsigned int d_hash = dictionary()->compute_hash(name, loader_data); |
| 0 | 527 int d_index = dictionary()->hash_to_index(d_hash); |
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528 unsigned int p_hash = placeholders()->compute_hash(name, loader_data); |
| 0 | 529 int p_index = placeholders()->hash_to_index(p_hash); |
| 530 | |
| 531 // superk is not used, resolve_super called for circularity check only | |
| 532 // This code is reached in two situations. One if this thread | |
| 533 // is loading the same class twice (e.g. ClassCircularity, or | |
| 534 // java.lang.instrument). | |
| 535 // The second is if another thread started the resolve_super first | |
| 536 // and has not yet finished. | |
| 537 // In both cases the original caller will clean up the placeholder | |
| 538 // entry on error. | |
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539 Klass* superk = SystemDictionary::resolve_super_or_fail(name, |
| 0 | 540 superclassname, |
| 541 class_loader, | |
| 542 protection_domain, | |
| 543 true, | |
| 544 CHECK_(nh)); | |
| 545 | |
| 514 | 546 // parallelCapable class loaders do NOT wait for parallel superclass loads to complete |
| 547 // Serial class loaders and bootstrap classloader do wait for superclass loads | |
| 548 if (!class_loader.is_null() && is_parallelCapable(class_loader)) { | |
| 0 | 549 MutexLocker mu(SystemDictionary_lock, THREAD); |
| 550 // Check if classloading completed while we were loading superclass or waiting | |
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551 Klass* check = find_class(d_index, d_hash, name, loader_data); |
| 0 | 552 if (check != NULL) { |
| 553 // Klass is already loaded, so just return it | |
| 554 return(instanceKlassHandle(THREAD, check)); | |
| 555 } else { | |
| 556 return nh; | |
| 557 } | |
| 558 } | |
| 559 | |
| 560 // must loop to both handle other placeholder updates | |
| 561 // and spurious notifications | |
| 562 bool super_load_in_progress = true; | |
| 563 PlaceholderEntry* placeholder; | |
| 564 while (super_load_in_progress) { | |
| 565 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 566 // Check if classloading completed while we were loading superclass or waiting | |
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567 Klass* check = find_class(d_index, d_hash, name, loader_data); |
| 0 | 568 if (check != NULL) { |
| 569 // Klass is already loaded, so just return it | |
| 570 return(instanceKlassHandle(THREAD, check)); | |
| 571 } else { | |
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572 placeholder = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
| 0 | 573 if (placeholder && placeholder->super_load_in_progress() ){ |
| 574 // Before UnsyncloadClass: | |
| 575 // We only get here if the application has released the | |
| 576 // classloader lock when another thread was in the middle of loading a | |
| 577 // superclass/superinterface for this class, and now | |
| 578 // this thread is also trying to load this class. | |
| 579 // To minimize surprises, the first thread that started to | |
| 580 // load a class should be the one to complete the loading | |
| 581 // with the classfile it initially expected. | |
| 582 // This logic has the current thread wait once it has done | |
| 583 // all the superclass/superinterface loading it can, until | |
| 584 // the original thread completes the class loading or fails | |
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585 // If it completes we will use the resulting InstanceKlass |
| 0 | 586 // which we will find below in the systemDictionary. |
| 587 // We also get here for parallel bootstrap classloader | |
| 588 if (class_loader.is_null()) { | |
| 589 SystemDictionary_lock->wait(); | |
| 590 } else { | |
| 591 double_lock_wait(lockObject, THREAD); | |
| 592 } | |
| 593 } else { | |
| 594 // If not in SD and not in PH, other thread's load must have failed | |
| 595 super_load_in_progress = false; | |
| 596 } | |
| 597 } | |
| 598 } | |
| 599 return (nh); | |
| 600 } | |
| 601 | |
| 602 | |
| 10405 | 603 Klass* SystemDictionary::resolve_instance_class_or_null(Symbol* name, |
| 604 Handle class_loader, | |
| 605 Handle protection_domain, | |
| 606 TRAPS) { | |
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607 assert(name != NULL && !FieldType::is_array(name) && |
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608 !FieldType::is_obj(name), "invalid class name"); |
| 0 | 609 |
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610 Ticks class_load_start_time = Ticks::now(); |
| 10405 | 611 |
| 0 | 612 // UseNewReflection |
| 613 // Fix for 4474172; see evaluation for more details | |
| 614 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); | |
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615 ClassLoaderData *loader_data = register_loader(class_loader, CHECK_NULL); |
| 0 | 616 |
| 617 // Do lookup to see if class already exist and the protection domain | |
| 618 // has the right access | |
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619 // This call uses find which checks protection domain already matches |
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620 // All subsequent calls use find_class, and set has_loaded_class so that |
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621 // before we return a result we call out to java to check for valid protection domain |
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622 // to allow returning the Klass* and add it to the pd_set if it is valid |
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623 unsigned int d_hash = dictionary()->compute_hash(name, loader_data); |
| 0 | 624 int d_index = dictionary()->hash_to_index(d_hash); |
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625 Klass* probe = dictionary()->find(d_index, d_hash, name, loader_data, |
| 0 | 626 protection_domain, THREAD); |
| 627 if (probe != NULL) return probe; | |
| 628 | |
| 629 | |
| 630 // Non-bootstrap class loaders will call out to class loader and | |
| 631 // define via jvm/jni_DefineClass which will acquire the | |
| 632 // class loader object lock to protect against multiple threads | |
| 633 // defining the class in parallel by accident. | |
| 634 // This lock must be acquired here so the waiter will find | |
| 635 // any successful result in the SystemDictionary and not attempt | |
| 636 // the define | |
| 514 | 637 // ParallelCapable Classloaders and the bootstrap classloader, |
| 0 | 638 // or all classloaders with UnsyncloadClass do not acquire lock here |
| 639 bool DoObjectLock = true; | |
| 514 | 640 if (is_parallelCapable(class_loader)) { |
| 0 | 641 DoObjectLock = false; |
| 642 } | |
| 643 | |
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644 unsigned int p_hash = placeholders()->compute_hash(name, loader_data); |
| 0 | 645 int p_index = placeholders()->hash_to_index(p_hash); |
| 646 | |
| 647 // Class is not in SystemDictionary so we have to do loading. | |
| 648 // Make sure we are synchronized on the class loader before we proceed | |
| 649 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
| 650 check_loader_lock_contention(lockObject, THREAD); | |
| 651 ObjectLocker ol(lockObject, THREAD, DoObjectLock); | |
| 652 | |
| 653 // Check again (after locking) if class already exist in SystemDictionary | |
| 654 bool class_has_been_loaded = false; | |
| 655 bool super_load_in_progress = false; | |
| 656 bool havesupername = false; | |
| 657 instanceKlassHandle k; | |
| 658 PlaceholderEntry* placeholder; | |
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659 Symbol* superclassname = NULL; |
| 0 | 660 |
| 661 { | |
| 662 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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663 Klass* check = find_class(d_index, d_hash, name, loader_data); |
| 0 | 664 if (check != NULL) { |
| 665 // Klass is already loaded, so just return it | |
| 666 class_has_been_loaded = true; | |
| 667 k = instanceKlassHandle(THREAD, check); | |
| 668 } else { | |
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669 placeholder = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
| 0 | 670 if (placeholder && placeholder->super_load_in_progress()) { |
| 671 super_load_in_progress = true; | |
| 672 if (placeholder->havesupername() == true) { | |
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673 superclassname = placeholder->supername(); |
| 0 | 674 havesupername = true; |
| 675 } | |
| 676 } | |
| 677 } | |
| 678 } | |
| 679 | |
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680 // If the class is in the placeholder table, class loading is in progress |
| 0 | 681 if (super_load_in_progress && havesupername==true) { |
| 682 k = SystemDictionary::handle_parallel_super_load(name, superclassname, | |
| 683 class_loader, protection_domain, lockObject, THREAD); | |
| 684 if (HAS_PENDING_EXCEPTION) { | |
| 685 return NULL; | |
| 686 } | |
| 687 if (!k.is_null()) { | |
| 688 class_has_been_loaded = true; | |
| 689 } | |
| 690 } | |
| 691 | |
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692 bool throw_circularity_error = false; |
| 0 | 693 if (!class_has_been_loaded) { |
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694 bool load_instance_added = false; |
| 0 | 695 |
| 696 // add placeholder entry to record loading instance class | |
| 697 // Five cases: | |
| 698 // All cases need to prevent modifying bootclasssearchpath | |
| 699 // in parallel with a classload of same classname | |
| 514 | 700 // Redefineclasses uses existence of the placeholder for the duration |
| 701 // of the class load to prevent concurrent redefinition of not completely | |
| 702 // defined classes. | |
| 0 | 703 // case 1. traditional classloaders that rely on the classloader object lock |
| 704 // - no other need for LOAD_INSTANCE | |
| 705 // case 2. traditional classloaders that break the classloader object lock | |
| 706 // as a deadlock workaround. Detection of this case requires that | |
| 707 // this check is done while holding the classloader object lock, | |
| 708 // and that lock is still held when calling classloader's loadClass. | |
| 709 // For these classloaders, we ensure that the first requestor | |
| 710 // completes the load and other requestors wait for completion. | |
| 711 // case 3. UnsyncloadClass - don't use objectLocker | |
| 712 // With this flag, we allow parallel classloading of a | |
| 713 // class/classloader pair | |
| 714 // case4. Bootstrap classloader - don't own objectLocker | |
| 715 // This classloader supports parallelism at the classloader level, | |
| 716 // but only allows a single load of a class/classloader pair. | |
| 717 // No performance benefit and no deadlock issues. | |
| 514 | 718 // case 5. parallelCapable user level classloaders - without objectLocker |
| 719 // Allow parallel classloading of a class/classloader pair | |
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720 |
| 0 | 721 { |
| 722 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 514 | 723 if (class_loader.is_null() || !is_parallelCapable(class_loader)) { |
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724 PlaceholderEntry* oldprobe = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
| 0 | 725 if (oldprobe) { |
| 726 // only need check_seen_thread once, not on each loop | |
| 727 // 6341374 java/lang/Instrument with -Xcomp | |
| 728 if (oldprobe->check_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE)) { | |
| 729 throw_circularity_error = true; | |
| 730 } else { | |
| 731 // case 1: traditional: should never see load_in_progress. | |
| 732 while (!class_has_been_loaded && oldprobe && oldprobe->instance_load_in_progress()) { | |
| 733 | |
| 734 // case 4: bootstrap classloader: prevent futile classloading, | |
| 735 // wait on first requestor | |
| 736 if (class_loader.is_null()) { | |
| 737 SystemDictionary_lock->wait(); | |
| 738 } else { | |
| 739 // case 2: traditional with broken classloader lock. wait on first | |
| 740 // requestor. | |
| 741 double_lock_wait(lockObject, THREAD); | |
| 742 } | |
| 743 // Check if classloading completed while we were waiting | |
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744 Klass* check = find_class(d_index, d_hash, name, loader_data); |
| 0 | 745 if (check != NULL) { |
| 746 // Klass is already loaded, so just return it | |
| 747 k = instanceKlassHandle(THREAD, check); | |
| 748 class_has_been_loaded = true; | |
| 749 } | |
| 750 // check if other thread failed to load and cleaned up | |
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751 oldprobe = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
| 0 | 752 } |
| 753 } | |
| 754 } | |
| 755 } | |
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756 // All cases: add LOAD_INSTANCE holding SystemDictionary_lock |
| 514 | 757 // case 3: UnsyncloadClass || case 5: parallelCapable: allow competing threads to try |
| 0 | 758 // LOAD_INSTANCE in parallel |
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759 |
| 514 | 760 if (!throw_circularity_error && !class_has_been_loaded) { |
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761 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, name, loader_data, PlaceholderTable::LOAD_INSTANCE, NULL, THREAD); |
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762 load_instance_added = true; |
| 0 | 763 // For class loaders that do not acquire the classloader object lock, |
| 764 // if they did not catch another thread holding LOAD_INSTANCE, | |
| 765 // need a check analogous to the acquire ObjectLocker/find_class | |
| 766 // i.e. now that we hold the LOAD_INSTANCE token on loading this class/CL | |
| 767 // one final check if the load has already completed | |
| 514 | 768 // class loaders holding the ObjectLock shouldn't find the class here |
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769 Klass* check = find_class(d_index, d_hash, name, loader_data); |
| 0 | 770 if (check != NULL) { |
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771 // Klass is already loaded, so return it after checking/adding protection domain |
| 0 | 772 k = instanceKlassHandle(THREAD, check); |
| 773 class_has_been_loaded = true; | |
| 774 } | |
| 775 } | |
| 776 } | |
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777 |
| 0 | 778 // must throw error outside of owning lock |
| 779 if (throw_circularity_error) { | |
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780 assert(!HAS_PENDING_EXCEPTION && load_instance_added == false,"circularity error cleanup"); |
| 0 | 781 ResourceMark rm(THREAD); |
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782 THROW_MSG_NULL(vmSymbols::java_lang_ClassCircularityError(), name->as_C_string()); |
| 0 | 783 } |
| 784 | |
| 785 if (!class_has_been_loaded) { | |
| 786 | |
| 787 // Do actual loading | |
| 788 k = load_instance_class(name, class_loader, THREAD); | |
| 789 | |
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790 // For UnsyncloadClass only |
| 0 | 791 // If they got a linkageError, check if a parallel class load succeeded. |
| 792 // If it did, then for bytecode resolution the specification requires | |
| 793 // that we return the same result we did for the other thread, i.e. the | |
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794 // successfully loaded InstanceKlass |
| 0 | 795 // Should not get here for classloaders that support parallelism |
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796 // with the new cleaner mechanism, even with AllowParallelDefineClass |
| 514 | 797 // Bootstrap goes through here to allow for an extra guarantee check |
| 0 | 798 if (UnsyncloadClass || (class_loader.is_null())) { |
| 799 if (k.is_null() && HAS_PENDING_EXCEPTION | |
| 1142 | 800 && PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { |
| 0 | 801 MutexLocker mu(SystemDictionary_lock, THREAD); |
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802 Klass* check = find_class(d_index, d_hash, name, loader_data); |
| 0 | 803 if (check != NULL) { |
| 804 // Klass is already loaded, so just use it | |
| 805 k = instanceKlassHandle(THREAD, check); | |
| 806 CLEAR_PENDING_EXCEPTION; | |
| 807 guarantee((!class_loader.is_null()), "dup definition for bootstrap loader?"); | |
| 808 } | |
| 809 } | |
| 810 } | |
| 811 | |
| 812 // If everything was OK (no exceptions, no null return value), and | |
| 813 // class_loader is NOT the defining loader, do a little more bookkeeping. | |
| 814 if (!HAS_PENDING_EXCEPTION && !k.is_null() && | |
| 815 k->class_loader() != class_loader()) { | |
| 816 | |
| 817 check_constraints(d_index, d_hash, k, class_loader, false, THREAD); | |
| 818 | |
| 819 // Need to check for a PENDING_EXCEPTION again; check_constraints | |
| 820 // can throw and doesn't use the CHECK macro. | |
| 821 if (!HAS_PENDING_EXCEPTION) { | |
| 822 { // Grabbing the Compile_lock prevents systemDictionary updates | |
| 823 // during compilations. | |
| 824 MutexLocker mu(Compile_lock, THREAD); | |
| 825 update_dictionary(d_index, d_hash, p_index, p_hash, | |
| 10405 | 826 k, class_loader, THREAD); |
| 0 | 827 } |
| 10405 | 828 |
| 0 | 829 if (JvmtiExport::should_post_class_load()) { |
| 830 Thread *thread = THREAD; | |
| 831 assert(thread->is_Java_thread(), "thread->is_Java_thread()"); | |
| 832 JvmtiExport::post_class_load((JavaThread *) thread, k()); | |
| 833 } | |
| 834 } | |
| 835 } | |
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836 } // load_instance_class loop |
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837 |
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838 if (load_instance_added == true) { |
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839 // clean up placeholder entries for LOAD_INSTANCE success or error |
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840 // This brackets the SystemDictionary updates for both defining |
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841 // and initiating loaders |
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842 MutexLocker mu(SystemDictionary_lock, THREAD); |
| 10405 | 843 placeholders()->find_and_remove(p_index, p_hash, name, loader_data, PlaceholderTable::LOAD_INSTANCE, THREAD); |
| 844 SystemDictionary_lock->notify_all(); | |
| 0 | 845 } |
| 846 } | |
| 847 | |
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848 if (HAS_PENDING_EXCEPTION || k.is_null()) { |
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849 return NULL; |
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850 } |
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851 |
| 10405 | 852 post_class_load_event(class_load_start_time, k, class_loader); |
| 853 | |
| 0 | 854 #ifdef ASSERT |
| 855 { | |
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856 ClassLoaderData* loader_data = k->class_loader_data(); |
| 0 | 857 MutexLocker mu(SystemDictionary_lock, THREAD); |
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858 Klass* kk = find_class(name, loader_data); |
| 0 | 859 assert(kk == k(), "should be present in dictionary"); |
| 860 } | |
| 861 #endif | |
| 862 | |
| 863 // return if the protection domain in NULL | |
| 864 if (protection_domain() == NULL) return k(); | |
| 865 | |
| 866 // Check the protection domain has the right access | |
| 867 { | |
| 868 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 869 // Note that we have an entry, and entries can be deleted only during GC, | |
| 870 // so we cannot allow GC to occur while we're holding this entry. | |
| 871 // We're using a No_Safepoint_Verifier to catch any place where we | |
| 872 // might potentially do a GC at all. | |
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873 // Dictionary::do_unloading() asserts that classes in SD are only |
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874 // unloaded at a safepoint. Anonymous classes are not in SD. |
| 0 | 875 No_Safepoint_Verifier nosafepoint; |
| 876 if (dictionary()->is_valid_protection_domain(d_index, d_hash, name, | |
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877 loader_data, |
| 0 | 878 protection_domain)) { |
| 879 return k(); | |
| 880 } | |
| 881 } | |
| 882 | |
| 883 // Verify protection domain. If it fails an exception is thrown | |
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884 validate_protection_domain(k, class_loader, protection_domain, CHECK_NULL); |
| 0 | 885 |
| 886 return k(); | |
| 887 } | |
| 888 | |
| 889 | |
| 890 // This routine does not lock the system dictionary. | |
| 891 // | |
| 892 // Since readers don't hold a lock, we must make sure that system | |
| 893 // dictionary entries are only removed at a safepoint (when only one | |
| 894 // thread is running), and are added to in a safe way (all links must | |
| 895 // be updated in an MT-safe manner). | |
| 896 // | |
| 897 // Callers should be aware that an entry could be added just after | |
| 898 // _dictionary->bucket(index) is read here, so the caller will not see | |
| 899 // the new entry. | |
| 900 | |
|
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901 Klass* SystemDictionary::find(Symbol* class_name, |
|
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902 Handle class_loader, |
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903 Handle protection_domain, |
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904 TRAPS) { |
| 0 | 905 |
|
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906 // UseNewReflection |
|
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907 // The result of this call should be consistent with the result |
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908 // of the call to resolve_instance_class_or_null(). |
|
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909 // See evaluation 6790209 and 4474172 for more details. |
|
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910 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); |
|
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911 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data_or_null(class_loader()); |
|
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912 |
|
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913 if (loader_data == NULL) { |
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914 // If the ClassLoaderData has not been setup, |
|
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915 // then the class loader has no entries in the dictionary. |
|
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916 return NULL; |
|
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917 } |
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918 |
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919 unsigned int d_hash = dictionary()->compute_hash(class_name, loader_data); |
| 0 | 920 int d_index = dictionary()->hash_to_index(d_hash); |
| 921 | |
| 922 { | |
| 923 // Note that we have an entry, and entries can be deleted only during GC, | |
| 924 // so we cannot allow GC to occur while we're holding this entry. | |
| 925 // We're using a No_Safepoint_Verifier to catch any place where we | |
| 926 // might potentially do a GC at all. | |
|
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927 // Dictionary::do_unloading() asserts that classes in SD are only |
|
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928 // unloaded at a safepoint. Anonymous classes are not in SD. |
| 0 | 929 No_Safepoint_Verifier nosafepoint; |
|
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930 return dictionary()->find(d_index, d_hash, class_name, loader_data, |
| 0 | 931 protection_domain, THREAD); |
| 932 } | |
| 933 } | |
| 934 | |
| 935 | |
| 936 // Look for a loaded instance or array klass by name. Do not do any loading. | |
| 937 // return NULL in case of error. | |
|
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938 Klass* SystemDictionary::find_instance_or_array_klass(Symbol* class_name, |
|
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939 Handle class_loader, |
|
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940 Handle protection_domain, |
|
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941 TRAPS) { |
|
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942 Klass* k = NULL; |
|
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943 assert(class_name != NULL, "class name must be non NULL"); |
|
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944 |
|
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945 if (FieldType::is_array(class_name)) { |
| 0 | 946 // The name refers to an array. Parse the name. |
|
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947 // dimension and object_key in FieldArrayInfo are assigned as a |
|
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948 // side-effect of this call |
|
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949 FieldArrayInfo fd; |
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950 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
| 0 | 951 if (t != T_OBJECT) { |
| 952 k = Universe::typeArrayKlassObj(t); | |
| 953 } else { | |
|
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954 k = SystemDictionary::find(fd.object_key(), class_loader, protection_domain, THREAD); |
| 0 | 955 } |
| 956 if (k != NULL) { | |
| 6983 | 957 k = k->array_klass_or_null(fd.dimension()); |
| 0 | 958 } |
| 959 } else { | |
| 960 k = find(class_name, class_loader, protection_domain, THREAD); | |
| 961 } | |
| 962 return k; | |
| 963 } | |
| 964 | |
| 965 // Note: this method is much like resolve_from_stream, but | |
| 966 // updates no supplemental data structures. | |
| 967 // TODO consolidate the two methods with a helper routine? | |
|
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968 Klass* SystemDictionary::parse_stream(Symbol* class_name, |
|
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969 Handle class_loader, |
|
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970 Handle protection_domain, |
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971 ClassFileStream* st, |
|
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972 KlassHandle host_klass, |
|
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973 GrowableArray<Handle>* cp_patches, |
|
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974 TRAPS) { |
|
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975 TempNewSymbol parsed_name = NULL; |
| 0 | 976 |
|
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977 Ticks class_load_start_time = Ticks::now(); |
| 10405 | 978 |
|
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979 ClassLoaderData* loader_data; |
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980 if (host_klass.not_null()) { |
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981 // Create a new CLD for anonymous class, that uses the same class loader |
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982 // as the host_klass |
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983 assert(EnableInvokeDynamic, ""); |
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984 guarantee(host_klass->class_loader() == class_loader(), "should be the same"); |
|
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985 guarantee(!DumpSharedSpaces, "must not create anonymous classes when dumping"); |
|
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986 loader_data = ClassLoaderData::anonymous_class_loader_data(class_loader(), CHECK_NULL); |
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987 loader_data->record_dependency(host_klass(), CHECK_NULL); |
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988 } else { |
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989 loader_data = ClassLoaderData::class_loader_data(class_loader()); |
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990 } |
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991 |
| 0 | 992 // Parse the stream. Note that we do this even though this klass might |
| 993 // already be present in the SystemDictionary, otherwise we would not | |
| 994 // throw potential ClassFormatErrors. | |
| 995 // | |
| 996 // Note: "name" is updated. | |
| 997 | |
| 998 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
|
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999 loader_data, |
| 0 | 1000 protection_domain, |
| 710 | 1001 host_klass, |
| 1002 cp_patches, | |
| 0 | 1003 parsed_name, |
|
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1004 true, |
| 0 | 1005 THREAD); |
| 1006 | |
| 1007 | |
|
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1008 if (host_klass.not_null() && k.not_null()) { |
|
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1009 assert(EnableInvokeDynamic, ""); |
|
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1010 // If it's anonymous, initialize it now, since nobody else will. |
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1011 |
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1012 { |
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1013 MutexLocker mu_r(Compile_lock, THREAD); |
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1014 |
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1015 // Add to class hierarchy, initialize vtables, and do possible |
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1016 // deoptimizations. |
|
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1017 add_to_hierarchy(k, CHECK_NULL); // No exception, but can block |
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1018 |
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1019 // But, do not add to system dictionary. |
|
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1020 |
|
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1021 // compiled code dependencies need to be validated anyway |
|
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1022 notice_modification(); |
|
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1023 } |
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1024 |
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1025 // Rewrite and patch constant pool here. |
|
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1026 k->link_class(CHECK_NULL); |
|
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1027 if (cp_patches != NULL) { |
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1028 k->constants()->patch_resolved_references(cp_patches); |
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1029 } |
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1030 k->eager_initialize(CHECK_NULL); |
|
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1031 |
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1032 // notify jvmti |
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1033 if (JvmtiExport::should_post_class_load()) { |
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1034 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); |
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1035 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); |
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1036 } |
| 10405 | 1037 |
| 1038 post_class_load_event(class_load_start_time, k, class_loader); | |
|
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1039 } |
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1040 assert(host_klass.not_null() || cp_patches == NULL, |
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1041 "cp_patches only found with host_klass"); |
|
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1042 |
| 0 | 1043 return k(); |
| 1044 } | |
| 1045 | |
| 1046 // Add a klass to the system from a stream (called by jni_DefineClass and | |
| 1047 // JVM_DefineClass). | |
| 1048 // Note: class_name can be NULL. In that case we do not know the name of | |
| 1049 // the class until we have parsed the stream. | |
| 1050 | |
|
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1051 Klass* SystemDictionary::resolve_from_stream(Symbol* class_name, |
|
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1052 Handle class_loader, |
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1053 Handle protection_domain, |
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1054 ClassFileStream* st, |
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1055 bool verify, |
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1056 TRAPS) { |
| 0 | 1057 |
| 514 | 1058 // Classloaders that support parallelism, e.g. bootstrap classloader, |
| 1059 // or all classloaders with UnsyncloadClass do not acquire lock here | |
| 1060 bool DoObjectLock = true; | |
| 1061 if (is_parallelCapable(class_loader)) { | |
| 1062 DoObjectLock = false; | |
| 1063 } | |
| 1064 | |
|
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1065 ClassLoaderData* loader_data = register_loader(class_loader, CHECK_NULL); |
|
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1066 |
| 514 | 1067 // Make sure we are synchronized on the class loader before we proceed |
| 0 | 1068 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); |
| 1069 check_loader_lock_contention(lockObject, THREAD); | |
| 514 | 1070 ObjectLocker ol(lockObject, THREAD, DoObjectLock); |
| 0 | 1071 |
|
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1072 TempNewSymbol parsed_name = NULL; |
| 0 | 1073 |
| 1074 // Parse the stream. Note that we do this even though this klass might | |
| 1075 // already be present in the SystemDictionary, otherwise we would not | |
| 1076 // throw potential ClassFormatErrors. | |
| 1077 // | |
| 1078 // Note: "name" is updated. | |
| 1079 | |
| 1080 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
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1081 loader_data, |
| 0 | 1082 protection_domain, |
| 1083 parsed_name, | |
|
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1084 verify, |
| 0 | 1085 THREAD); |
| 1086 | |
| 1087 const char* pkg = "java/"; | |
| 1088 if (!HAS_PENDING_EXCEPTION && | |
| 1089 !class_loader.is_null() && | |
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1090 parsed_name != NULL && |
| 0 | 1091 !strncmp((const char*)parsed_name->bytes(), pkg, strlen(pkg))) { |
| 1092 // It is illegal to define classes in the "java." package from | |
| 1093 // JVM_DefineClass or jni_DefineClass unless you're the bootclassloader | |
| 1094 ResourceMark rm(THREAD); | |
| 1095 char* name = parsed_name->as_C_string(); | |
| 1096 char* index = strrchr(name, '/'); | |
| 1097 *index = '\0'; // chop to just the package name | |
| 1098 while ((index = strchr(name, '/')) != NULL) { | |
| 1099 *index = '.'; // replace '/' with '.' in package name | |
| 1100 } | |
| 1101 const char* fmt = "Prohibited package name: %s"; | |
| 1102 size_t len = strlen(fmt) + strlen(name); | |
| 1103 char* message = NEW_RESOURCE_ARRAY(char, len); | |
| 1104 jio_snprintf(message, len, fmt, name); | |
| 1105 Exceptions::_throw_msg(THREAD_AND_LOCATION, | |
| 1106 vmSymbols::java_lang_SecurityException(), message); | |
| 1107 } | |
| 1108 | |
| 1109 if (!HAS_PENDING_EXCEPTION) { | |
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1110 assert(parsed_name != NULL, "Sanity"); |
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1111 assert(class_name == NULL || class_name == parsed_name, "name mismatch"); |
| 0 | 1112 // Verification prevents us from creating names with dots in them, this |
| 1113 // asserts that that's the case. | |
| 1114 assert(is_internal_format(parsed_name), | |
| 1115 "external class name format used internally"); | |
| 1116 | |
| 1117 // Add class just loaded | |
| 514 | 1118 // If a class loader supports parallel classloading handle parallel define requests |
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1119 // find_or_define_instance_class may return a different InstanceKlass |
| 514 | 1120 if (is_parallelCapable(class_loader)) { |
| 1121 k = find_or_define_instance_class(class_name, class_loader, k, THREAD); | |
| 1122 } else { | |
| 1123 define_instance_class(k, THREAD); | |
| 1124 } | |
| 0 | 1125 } |
| 1126 | |
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1127 // Make sure we have an entry in the SystemDictionary on success |
| 0 | 1128 debug_only( { |
| 1129 if (!HAS_PENDING_EXCEPTION) { | |
|
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1130 assert(parsed_name != NULL, "parsed_name is still null?"); |
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1131 Symbol* h_name = k->name(); |
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1132 ClassLoaderData *defining_loader_data = k->class_loader_data(); |
| 0 | 1133 |
| 1134 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 1135 | |
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1136 Klass* check = find_class(parsed_name, loader_data); |
| 0 | 1137 assert(check == k(), "should be present in the dictionary"); |
| 1138 | |
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1139 Klass* check2 = find_class(h_name, defining_loader_data); |
| 0 | 1140 assert(check == check2, "name inconsistancy in SystemDictionary"); |
| 1141 } | |
| 1142 } ); | |
| 1143 | |
| 1144 return k(); | |
| 1145 } | |
| 1146 | |
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1147 #if INCLUDE_CDS |
| 6197 | 1148 void SystemDictionary::set_shared_dictionary(HashtableBucket<mtClass>* t, int length, |
| 0 | 1149 int number_of_entries) { |
| 6197 | 1150 assert(length == _nof_buckets * sizeof(HashtableBucket<mtClass>), |
| 0 | 1151 "bad shared dictionary size."); |
| 1152 _shared_dictionary = new Dictionary(_nof_buckets, t, number_of_entries); | |
| 1153 } | |
| 1154 | |
| 1155 | |
| 1156 // If there is a shared dictionary, then find the entry for the | |
| 1157 // given shared system class, if any. | |
| 1158 | |
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1159 Klass* SystemDictionary::find_shared_class(Symbol* class_name) { |
| 0 | 1160 if (shared_dictionary() != NULL) { |
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1161 unsigned int d_hash = shared_dictionary()->compute_hash(class_name, NULL); |
|
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1162 int d_index = shared_dictionary()->hash_to_index(d_hash); |
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1163 |
| 0 | 1164 return shared_dictionary()->find_shared_class(d_index, d_hash, class_name); |
| 1165 } else { | |
| 1166 return NULL; | |
| 1167 } | |
| 1168 } | |
| 1169 | |
| 1170 | |
| 1171 // Load a class from the shared spaces (found through the shared system | |
| 1172 // dictionary). Force the superclass and all interfaces to be loaded. | |
| 1173 // Update the class definition to include sibling classes and no | |
| 1174 // subclasses (yet). [Classes in the shared space are not part of the | |
| 1175 // object hierarchy until loaded.] | |
| 1176 | |
| 1177 instanceKlassHandle SystemDictionary::load_shared_class( | |
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1178 Symbol* class_name, Handle class_loader, TRAPS) { |
| 0 | 1179 instanceKlassHandle ik (THREAD, find_shared_class(class_name)); |
|
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1180 // Make sure we only return the boot class for the NULL classloader. |
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1181 if (ik.not_null() && |
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1182 SharedClassUtil::is_shared_boot_class(ik()) && class_loader.is_null()) { |
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1183 Handle protection_domain; |
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1184 return load_shared_class(ik, class_loader, protection_domain, THREAD); |
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1185 } |
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1186 return instanceKlassHandle(); |
| 0 | 1187 } |
| 1188 | |
|
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1189 instanceKlassHandle SystemDictionary::load_shared_class(instanceKlassHandle ik, |
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1190 Handle class_loader, |
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1191 Handle protection_domain, TRAPS) { |
| 0 | 1192 if (ik.not_null()) { |
| 1193 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1194 Symbol* class_name = ik->name(); |
| 0 | 1195 |
| 1196 // Found the class, now load the superclass and interfaces. If they | |
| 1197 // are shared, add them to the main system dictionary and reset | |
| 1198 // their hierarchy references (supers, subs, and interfaces). | |
| 1199 | |
| 1200 if (ik->super() != NULL) { | |
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1201 Symbol* cn = ik->super()->name(); |
| 0 | 1202 resolve_super_or_fail(class_name, cn, |
|
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1203 class_loader, protection_domain, true, CHECK_(nh)); |
| 0 | 1204 } |
| 1205 | |
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1206 Array<Klass*>* interfaces = ik->local_interfaces(); |
| 0 | 1207 int num_interfaces = interfaces->length(); |
| 1208 for (int index = 0; index < num_interfaces; index++) { | |
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1209 Klass* k = interfaces->at(index); |
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1210 |
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1211 // Note: can not use InstanceKlass::cast here because |
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1212 // interfaces' InstanceKlass's C++ vtbls haven't been |
| 0 | 1213 // reinitialized yet (they will be once the interface classes |
| 1214 // are loaded) | |
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1215 Symbol* name = k->name(); |
|
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1216 resolve_super_or_fail(class_name, name, class_loader, protection_domain, false, CHECK_(nh)); |
| 0 | 1217 } |
| 1218 | |
| 1219 // Adjust methods to recover missing data. They need addresses for | |
| 1220 // interpreter entry points and their default native method address | |
| 1221 // must be reset. | |
| 1222 | |
| 1223 // Updating methods must be done under a lock so multiple | |
| 1224 // threads don't update these in parallel | |
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1225 // |
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1226 // Shared classes are all currently loaded by either the bootstrap or |
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1227 // internal parallel class loaders, so this will never cause a deadlock |
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1228 // on a custom class loader lock. |
| 0 | 1229 |
|
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1230 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data(class_loader()); |
| 0 | 1231 { |
| 1232 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
| 1233 check_loader_lock_contention(lockObject, THREAD); | |
| 1234 ObjectLocker ol(lockObject, THREAD, true); | |
|
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1235 ik->restore_unshareable_info(loader_data, protection_domain, CHECK_(nh)); |
| 0 | 1236 } |
| 1237 | |
| 1238 if (TraceClassLoading) { | |
| 1239 ResourceMark rm; | |
| 1240 tty->print("[Loaded %s", ik->external_name()); | |
| 1241 tty->print(" from shared objects file"); | |
|
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1242 if (class_loader.not_null()) { |
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1243 tty->print(" by %s", loader_data->loader_name()); |
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1244 } |
| 0 | 1245 tty->print_cr("]"); |
| 1246 } | |
|
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1247 |
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1248 if (DumpLoadedClassList != NULL && classlist_file->is_open()) { |
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1249 // Only dump the classes that can be stored into CDS archive |
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1250 if (SystemDictionaryShared::is_sharing_possible(loader_data)) { |
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1251 ResourceMark rm(THREAD); |
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1252 classlist_file->print_cr("%s", ik->name()->as_C_string()); |
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1253 classlist_file->flush(); |
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|
1254 } |
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1255 } |
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1256 |
| 0 | 1257 // notify a class loaded from shared object |
|
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1258 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(ik()), |
| 0 | 1259 true /* shared class */); |
| 1260 } | |
| 1261 return ik; | |
| 1262 } | |
| 20376 | 1263 #endif // INCLUDE_CDS |
| 0 | 1264 |
|
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1265 instanceKlassHandle SystemDictionary::load_instance_class(Symbol* class_name, Handle class_loader, TRAPS) { |
| 0 | 1266 instanceKlassHandle nh = instanceKlassHandle(); // null Handle |
| 1267 if (class_loader.is_null()) { | |
|
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1268 |
| 0 | 1269 // Search the shared system dictionary for classes preloaded into the |
| 1270 // shared spaces. | |
| 1271 instanceKlassHandle k; | |
|
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1272 { |
|
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1273 #if INCLUDE_CDS |
|
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1274 PerfTraceTime vmtimer(ClassLoader::perf_shared_classload_time()); |
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1275 k = load_shared_class(class_name, class_loader, THREAD); |
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1276 #endif |
|
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1277 } |
| 0 | 1278 |
| 1279 if (k.is_null()) { | |
| 1280 // Use VM class loader | |
|
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1281 PerfTraceTime vmtimer(ClassLoader::perf_sys_classload_time()); |
| 0 | 1282 k = ClassLoader::load_classfile(class_name, CHECK_(nh)); |
| 1283 } | |
| 1284 | |
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1285 // find_or_define_instance_class may return a different InstanceKlass |
| 0 | 1286 if (!k.is_null()) { |
| 1287 k = find_or_define_instance_class(class_name, class_loader, k, CHECK_(nh)); | |
| 1288 } | |
| 1289 return k; | |
| 1290 } else { | |
| 1291 // Use user specified class loader to load class. Call loadClass operation on class_loader. | |
| 1292 ResourceMark rm(THREAD); | |
| 1293 | |
|
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1294 assert(THREAD->is_Java_thread(), "must be a JavaThread"); |
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1295 JavaThread* jt = (JavaThread*) THREAD; |
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1296 |
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1297 PerfClassTraceTime vmtimer(ClassLoader::perf_app_classload_time(), |
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1298 ClassLoader::perf_app_classload_selftime(), |
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1299 ClassLoader::perf_app_classload_count(), |
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1300 jt->get_thread_stat()->perf_recursion_counts_addr(), |
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1301 jt->get_thread_stat()->perf_timers_addr(), |
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1302 PerfClassTraceTime::CLASS_LOAD); |
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1303 |
| 0 | 1304 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nh)); |
| 1305 // Translate to external class name format, i.e., convert '/' chars to '.' | |
| 1306 Handle string = java_lang_String::externalize_classname(s, CHECK_(nh)); | |
| 1307 | |
| 1308 JavaValue result(T_OBJECT); | |
| 1309 | |
| 1142 | 1310 KlassHandle spec_klass (THREAD, SystemDictionary::ClassLoader_klass()); |
| 0 | 1311 |
| 514 | 1312 // Call public unsynchronized loadClass(String) directly for all class loaders |
| 1313 // for parallelCapable class loaders. JDK >=7, loadClass(String, boolean) will | |
| 1314 // acquire a class-name based lock rather than the class loader object lock. | |
| 1315 // JDK < 7 already acquire the class loader lock in loadClass(String, boolean), | |
| 1316 // so the call to loadClassInternal() was not required. | |
| 1317 // | |
| 1318 // UnsyncloadClass flag means both call loadClass(String) and do | |
| 1319 // not acquire the class loader lock even for class loaders that are | |
| 1320 // not parallelCapable. This was a risky transitional | |
| 1321 // flag for diagnostic purposes only. It is risky to call | |
| 0 | 1322 // custom class loaders without synchronization. |
| 1323 // WARNING If a custom class loader does NOT synchronizer findClass, or callers of | |
| 514 | 1324 // findClass, the UnsyncloadClass flag risks unexpected timing bugs in the field. |
| 0 | 1325 // Do NOT assume this will be supported in future releases. |
| 514 | 1326 // |
| 1327 // Added MustCallLoadClassInternal in case we discover in the field | |
| 1328 // a customer that counts on this call | |
| 1329 if (MustCallLoadClassInternal && has_loadClassInternal()) { | |
| 0 | 1330 JavaCalls::call_special(&result, |
| 1331 class_loader, | |
| 1332 spec_klass, | |
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1333 vmSymbols::loadClassInternal_name(), |
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1334 vmSymbols::string_class_signature(), |
| 0 | 1335 string, |
| 1336 CHECK_(nh)); | |
| 1337 } else { | |
| 1338 JavaCalls::call_virtual(&result, | |
| 1339 class_loader, | |
| 1340 spec_klass, | |
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1341 vmSymbols::loadClass_name(), |
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1342 vmSymbols::string_class_signature(), |
| 0 | 1343 string, |
| 1344 CHECK_(nh)); | |
| 1345 } | |
| 1346 | |
| 1347 assert(result.get_type() == T_OBJECT, "just checking"); | |
| 1348 oop obj = (oop) result.get_jobject(); | |
| 1349 | |
| 1350 // Primitive classes return null since forName() can not be | |
| 1351 // used to obtain any of the Class objects representing primitives or void | |
| 1352 if ((obj != NULL) && !(java_lang_Class::is_primitive(obj))) { | |
| 1353 instanceKlassHandle k = | |
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1354 instanceKlassHandle(THREAD, java_lang_Class::as_Klass(obj)); |
| 0 | 1355 // For user defined Java class loaders, check that the name returned is |
| 1356 // the same as that requested. This check is done for the bootstrap | |
| 1357 // loader when parsing the class file. | |
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1358 if (class_name == k->name()) { |
| 0 | 1359 return k; |
| 1360 } | |
| 1361 } | |
| 1362 // Class is not found or has the wrong name, return NULL | |
| 1363 return nh; | |
| 1364 } | |
| 1365 } | |
| 1366 | |
| 1367 void SystemDictionary::define_instance_class(instanceKlassHandle k, TRAPS) { | |
| 1368 | |
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1369 ClassLoaderData* loader_data = k->class_loader_data(); |
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1370 Handle class_loader_h(THREAD, loader_data->class_loader()); |
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1371 |
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1372 for (uintx it = 0; it < GCExpandToAllocateDelayMillis; it++){} |
| 0 | 1373 |
| 514 | 1374 // for bootstrap and other parallel classloaders don't acquire lock, |
| 1375 // use placeholder token | |
| 1376 // If a parallelCapable class loader calls define_instance_class instead of | |
| 1377 // find_or_define_instance_class to get here, we have a timing | |
| 1378 // hole with systemDictionary updates and check_constraints | |
| 1379 if (!class_loader_h.is_null() && !is_parallelCapable(class_loader_h)) { | |
| 0 | 1380 assert(ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, |
| 1381 compute_loader_lock_object(class_loader_h, THREAD)), | |
| 1382 "define called without lock"); | |
| 1383 } | |
| 1384 | |
| 1385 // Check class-loading constraints. Throw exception if violation is detected. | |
| 1386 // Grabs and releases SystemDictionary_lock | |
| 1387 // The check_constraints/find_class call and update_dictionary sequence | |
| 1388 // must be "atomic" for a specific class/classloader pair so we never | |
| 1389 // define two different instanceKlasses for that class/classloader pair. | |
| 1390 // Existing classloaders will call define_instance_class with the | |
| 1391 // classloader lock held | |
| 1392 // Parallel classloaders will call find_or_define_instance_class | |
| 1393 // which will require a token to perform the define class | |
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1394 Symbol* name_h = k->name(); |
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1395 unsigned int d_hash = dictionary()->compute_hash(name_h, loader_data); |
| 0 | 1396 int d_index = dictionary()->hash_to_index(d_hash); |
| 1397 check_constraints(d_index, d_hash, k, class_loader_h, true, CHECK); | |
| 1398 | |
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1399 // Register class just loaded with class loader (placed in Vector) |
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1400 // Note we do this before updating the dictionary, as this can |
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1401 // fail with an OutOfMemoryError (if it does, we will *not* put this |
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1402 // class in the dictionary and will not update the class hierarchy). |
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1403 // JVMTI FollowReferences needs to find the classes this way. |
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1404 if (k->class_loader() != NULL) { |
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1405 methodHandle m(THREAD, Universe::loader_addClass_method()); |
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1406 JavaValue result(T_VOID); |
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1407 JavaCallArguments args(class_loader_h); |
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1408 args.push_oop(Handle(THREAD, k->java_mirror())); |
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1409 JavaCalls::call(&result, m, &args, CHECK); |
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1410 } |
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1411 |
| 0 | 1412 // Add the new class. We need recompile lock during update of CHA. |
| 1413 { | |
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1414 unsigned int p_hash = placeholders()->compute_hash(name_h, loader_data); |
| 0 | 1415 int p_index = placeholders()->hash_to_index(p_hash); |
| 1416 | |
| 1417 MutexLocker mu_r(Compile_lock, THREAD); | |
| 1418 | |
| 1419 // Add to class hierarchy, initialize vtables, and do possible | |
| 1420 // deoptimizations. | |
| 1421 add_to_hierarchy(k, CHECK); // No exception, but can block | |
| 1422 | |
| 1423 // Add to systemDictionary - so other classes can see it. | |
| 1424 // Grabs and releases SystemDictionary_lock | |
| 1425 update_dictionary(d_index, d_hash, p_index, p_hash, | |
| 1426 k, class_loader_h, THREAD); | |
| 1427 } | |
| 1428 k->eager_initialize(THREAD); | |
| 1429 | |
| 1430 // notify jvmti | |
| 1431 if (JvmtiExport::should_post_class_load()) { | |
| 1432 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); | |
| 1433 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); | |
| 1434 | |
| 1435 } | |
| 10405 | 1436 |
| 0 | 1437 } |
| 1438 | |
| 1439 // Support parallel classloading | |
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1440 // All parallel class loaders, including bootstrap classloader |
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1441 // lock a placeholder entry for this class/class_loader pair |
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1442 // to allow parallel defines of different classes for this class loader |
| 514 | 1443 // With AllowParallelDefine flag==true, in case they do not synchronize around |
| 1444 // FindLoadedClass/DefineClass, calls, we check for parallel | |
| 0 | 1445 // loading for them, wait if a defineClass is in progress |
| 1446 // and return the initial requestor's results | |
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1447 // This flag does not apply to the bootstrap classloader. |
| 514 | 1448 // With AllowParallelDefine flag==false, call through to define_instance_class |
| 1449 // which will throw LinkageError: duplicate class definition. | |
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1450 // False is the requested default. |
| 0 | 1451 // For better performance, the class loaders should synchronize |
| 514 | 1452 // findClass(), i.e. FindLoadedClass/DefineClassIfAbsent or they |
| 0 | 1453 // potentially waste time reading and parsing the bytestream. |
| 1454 // Note: VM callers should ensure consistency of k/class_name,class_loader | |
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1455 instanceKlassHandle SystemDictionary::find_or_define_instance_class(Symbol* class_name, Handle class_loader, instanceKlassHandle k, TRAPS) { |
| 0 | 1456 |
| 1457 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1458 Symbol* name_h = k->name(); // passed in class_name may be null |
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1459 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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1460 |
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1461 unsigned int d_hash = dictionary()->compute_hash(name_h, loader_data); |
| 0 | 1462 int d_index = dictionary()->hash_to_index(d_hash); |
| 1463 | |
| 1464 // Hold SD lock around find_class and placeholder creation for DEFINE_CLASS | |
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1465 unsigned int p_hash = placeholders()->compute_hash(name_h, loader_data); |
| 0 | 1466 int p_index = placeholders()->hash_to_index(p_hash); |
| 1467 PlaceholderEntry* probe; | |
| 1468 | |
| 1469 { | |
| 1470 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 1471 // First check if class already defined | |
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1472 if (UnsyncloadClass || (is_parallelDefine(class_loader))) { |
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1473 Klass* check = find_class(d_index, d_hash, name_h, loader_data); |
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1474 if (check != NULL) { |
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1475 return(instanceKlassHandle(THREAD, check)); |
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1476 } |
| 0 | 1477 } |
| 1478 | |
| 1479 // Acquire define token for this class/classloader | |
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1480 probe = placeholders()->find_and_add(p_index, p_hash, name_h, loader_data, PlaceholderTable::DEFINE_CLASS, NULL, THREAD); |
| 514 | 1481 // Wait if another thread defining in parallel |
| 1482 // All threads wait - even those that will throw duplicate class: otherwise | |
| 1483 // caller is surprised by LinkageError: duplicate, but findLoadedClass fails | |
| 1484 // if other thread has not finished updating dictionary | |
| 1485 while (probe->definer() != NULL) { | |
| 1486 SystemDictionary_lock->wait(); | |
| 1487 } | |
| 1488 // Only special cases allow parallel defines and can use other thread's results | |
| 1489 // Other cases fall through, and may run into duplicate defines | |
| 1490 // caught by finding an entry in the SystemDictionary | |
| 6983 | 1491 if ((UnsyncloadClass || is_parallelDefine(class_loader)) && (probe->instance_klass() != NULL)) { |
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1492 placeholders()->find_and_remove(p_index, p_hash, name_h, loader_data, PlaceholderTable::DEFINE_CLASS, THREAD); |
| 514 | 1493 SystemDictionary_lock->notify_all(); |
| 0 | 1494 #ifdef ASSERT |
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1495 Klass* check = find_class(d_index, d_hash, name_h, loader_data); |
| 514 | 1496 assert(check != NULL, "definer missed recording success"); |
| 0 | 1497 #endif |
| 6983 | 1498 return(instanceKlassHandle(THREAD, probe->instance_klass())); |
| 0 | 1499 } else { |
| 514 | 1500 // This thread will define the class (even if earlier thread tried and had an error) |
| 1501 probe->set_definer(THREAD); | |
| 0 | 1502 } |
| 1503 } | |
| 1504 | |
| 1505 define_instance_class(k, THREAD); | |
| 1506 | |
| 1507 Handle linkage_exception = Handle(); // null handle | |
| 1508 | |
| 1509 // definer must notify any waiting threads | |
| 1510 { | |
| 1511 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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1512 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name_h, loader_data); |
| 0 | 1513 assert(probe != NULL, "DEFINE_CLASS placeholder lost?"); |
| 1514 if (probe != NULL) { | |
| 1515 if (HAS_PENDING_EXCEPTION) { | |
| 1516 linkage_exception = Handle(THREAD,PENDING_EXCEPTION); | |
| 1517 CLEAR_PENDING_EXCEPTION; | |
| 1518 } else { | |
| 6983 | 1519 probe->set_instance_klass(k()); |
| 0 | 1520 } |
| 1521 probe->set_definer(NULL); | |
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1522 placeholders()->find_and_remove(p_index, p_hash, name_h, loader_data, PlaceholderTable::DEFINE_CLASS, THREAD); |
| 0 | 1523 SystemDictionary_lock->notify_all(); |
| 1524 } | |
| 1525 } | |
| 1526 | |
| 1527 // Can't throw exception while holding lock due to rank ordering | |
| 1528 if (linkage_exception() != NULL) { | |
| 1529 THROW_OOP_(linkage_exception(), nh); // throws exception and returns | |
| 1530 } | |
| 1531 | |
| 1532 return k; | |
| 1533 } | |
| 1534 Handle SystemDictionary::compute_loader_lock_object(Handle class_loader, TRAPS) { | |
| 1535 // If class_loader is NULL we synchronize on _system_loader_lock_obj | |
| 1536 if (class_loader.is_null()) { | |
| 1537 return Handle(THREAD, _system_loader_lock_obj); | |
| 1538 } else { | |
| 1539 return class_loader; | |
| 1540 } | |
| 1541 } | |
| 1542 | |
| 1543 // This method is added to check how often we have to wait to grab loader | |
| 1544 // lock. The results are being recorded in the performance counters defined in | |
| 1545 // ClassLoader::_sync_systemLoaderLockContentionRate and | |
| 1546 // ClassLoader::_sync_nonSystemLoaderLockConteionRate. | |
| 1547 void SystemDictionary::check_loader_lock_contention(Handle loader_lock, TRAPS) { | |
| 1548 if (!UsePerfData) { | |
| 1549 return; | |
| 1550 } | |
| 1551 | |
| 1552 assert(!loader_lock.is_null(), "NULL lock object"); | |
| 1553 | |
| 1554 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader_lock) | |
| 1555 == ObjectSynchronizer::owner_other) { | |
| 1556 // contention will likely happen, so increment the corresponding | |
| 1557 // contention counter. | |
| 1558 if (loader_lock() == _system_loader_lock_obj) { | |
| 1559 ClassLoader::sync_systemLoaderLockContentionRate()->inc(); | |
| 1560 } else { | |
| 1561 ClassLoader::sync_nonSystemLoaderLockContentionRate()->inc(); | |
| 1562 } | |
| 1563 } | |
| 1564 } | |
| 1565 | |
| 1566 // ---------------------------------------------------------------------------- | |
| 1567 // Lookup | |
| 1568 | |
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1569 Klass* SystemDictionary::find_class(int index, unsigned int hash, |
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1570 Symbol* class_name, |
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1571 ClassLoaderData* loader_data) { |
| 0 | 1572 assert_locked_or_safepoint(SystemDictionary_lock); |
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1573 assert (index == dictionary()->index_for(class_name, loader_data), |
| 0 | 1574 "incorrect index?"); |
| 1575 | |
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1576 Klass* k = dictionary()->find_class(index, hash, class_name, loader_data); |
| 0 | 1577 return k; |
| 1578 } | |
| 1579 | |
| 1580 | |
| 1581 // Basic find on classes in the midst of being loaded | |
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1582 Symbol* SystemDictionary::find_placeholder(Symbol* class_name, |
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1583 ClassLoaderData* loader_data) { |
| 0 | 1584 assert_locked_or_safepoint(SystemDictionary_lock); |
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1585 unsigned int p_hash = placeholders()->compute_hash(class_name, loader_data); |
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1586 int p_index = placeholders()->hash_to_index(p_hash); |
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1587 return placeholders()->find_entry(p_index, p_hash, class_name, loader_data); |
| 0 | 1588 } |
| 1589 | |
| 1590 | |
| 1591 // Used for assertions and verification only | |
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1592 Klass* SystemDictionary::find_class(Symbol* class_name, ClassLoaderData* loader_data) { |
| 0 | 1593 #ifndef ASSERT |
|
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1594 guarantee(VerifyBeforeGC || |
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1595 VerifyDuringGC || |
|
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1596 VerifyBeforeExit || |
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1597 VerifyDuringStartup || |
| 0 | 1598 VerifyAfterGC, "too expensive"); |
| 1599 #endif | |
| 1600 assert_locked_or_safepoint(SystemDictionary_lock); | |
| 1601 | |
| 1602 // First look in the loaded class array | |
|
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1603 unsigned int d_hash = dictionary()->compute_hash(class_name, loader_data); |
| 0 | 1604 int d_index = dictionary()->hash_to_index(d_hash); |
|
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1605 return find_class(d_index, d_hash, class_name, loader_data); |
| 0 | 1606 } |
| 1607 | |
| 1608 | |
| 1609 // Get the next class in the diictionary. | |
|
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1610 Klass* SystemDictionary::try_get_next_class() { |
| 0 | 1611 return dictionary()->try_get_next_class(); |
| 1612 } | |
| 1613 | |
| 1614 | |
| 1615 // ---------------------------------------------------------------------------- | |
| 1616 // Update hierachy. This is done before the new klass has been added to the SystemDictionary. The Recompile_lock | |
| 1617 // is held, to ensure that the compiler is not using the class hierachy, and that deoptimization will kick in | |
| 1618 // before a new class is used. | |
| 1619 | |
| 1620 void SystemDictionary::add_to_hierarchy(instanceKlassHandle k, TRAPS) { | |
| 1621 assert(k.not_null(), "just checking"); | |
|
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1622 assert_locked_or_safepoint(Compile_lock); |
|
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1623 |
| 0 | 1624 // Link into hierachy. Make sure the vtables are initialized before linking into |
| 1625 k->append_to_sibling_list(); // add to superklass/sibling list | |
| 1626 k->process_interfaces(THREAD); // handle all "implements" declarations | |
|
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1627 k->set_init_state(InstanceKlass::loaded); |
| 0 | 1628 // Now flush all code that depended on old class hierarchy. |
| 1629 // Note: must be done *after* linking k into the hierarchy (was bug 12/9/97) | |
| 1630 // Also, first reinitialize vtable because it may have gotten out of synch | |
| 1631 // while the new class wasn't connected to the class hierarchy. | |
| 1632 Universe::flush_dependents_on(k); | |
| 1633 } | |
| 1634 | |
| 1635 // ---------------------------------------------------------------------------- | |
| 1636 // GC support | |
| 1637 | |
| 1638 // Following roots during mark-sweep is separated in two phases. | |
| 1639 // | |
| 1640 // The first phase follows preloaded classes and all other system | |
| 1641 // classes, since these will never get unloaded anyway. | |
| 1642 // | |
| 1643 // The second phase removes (unloads) unreachable classes from the | |
| 1644 // system dictionary and follows the remaining classes' contents. | |
| 1645 | |
| 1646 void SystemDictionary::always_strong_oops_do(OopClosure* blk) { | |
|
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1647 roots_oops_do(blk, NULL); |
| 0 | 1648 } |
| 1649 | |
|
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1650 void SystemDictionary::always_strong_classes_do(KlassClosure* closure) { |
| 0 | 1651 // Follow all system classes and temporary placeholders in dictionary |
|
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1652 dictionary()->always_strong_classes_do(closure); |
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1653 |
|
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1654 // Placeholders. These represent classes we're actively loading. |
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1655 placeholders()->classes_do(closure); |
| 0 | 1656 } |
| 1657 | |
|
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1658 // Calculate a "good" systemdictionary size based |
|
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1659 // on predicted or current loaded classes count |
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1660 int SystemDictionary::calculate_systemdictionary_size(int classcount) { |
|
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1661 int newsize = _old_default_sdsize; |
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1662 if ((classcount > 0) && !DumpSharedSpaces) { |
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1663 int desiredsize = classcount/_average_depth_goal; |
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1664 for (newsize = _primelist[_sdgeneration]; _sdgeneration < _prime_array_size -1; |
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1665 newsize = _primelist[++_sdgeneration]) { |
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1666 if (desiredsize <= newsize) { |
|
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1667 break; |
|
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|
1668 } |
|
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1669 } |
|
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|
1670 } |
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1671 return newsize; |
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|
1672 } |
| 10405 | 1673 |
| 12837 | 1674 #ifdef ASSERT |
| 1675 class VerifySDReachableAndLiveClosure : public OopClosure { | |
| 1676 private: | |
| 1677 BoolObjectClosure* _is_alive; | |
| 1678 | |
| 1679 template <class T> void do_oop_work(T* p) { | |
| 1680 oop obj = oopDesc::load_decode_heap_oop(p); | |
| 1681 guarantee(_is_alive->do_object_b(obj), "Oop in system dictionary must be live"); | |
| 1682 } | |
| 1683 | |
| 1684 public: | |
| 1685 VerifySDReachableAndLiveClosure(BoolObjectClosure* is_alive) : OopClosure(), _is_alive(is_alive) { } | |
| 1686 | |
| 1687 virtual void do_oop(oop* p) { do_oop_work(p); } | |
| 1688 virtual void do_oop(narrowOop* p) { do_oop_work(p); } | |
| 1689 }; | |
| 1690 #endif | |
| 1691 | |
|
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1692 // Assumes classes in the SystemDictionary are only unloaded at a safepoint |
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1693 // Note: anonymous classes are not in the SD. |
| 0 | 1694 bool SystemDictionary::do_unloading(BoolObjectClosure* is_alive) { |
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1695 // First, mark for unload all ClassLoaderData referencing a dead class loader. |
|
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1696 bool unloading_occurred = ClassLoaderDataGraph::do_unloading(is_alive); |
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1697 if (unloading_occurred) { |
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1698 dictionary()->do_unloading(); |
|
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1699 constraints()->purge_loader_constraints(); |
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1700 resolution_errors()->purge_resolution_errors(); |
| 12837 | 1701 } |
| 1702 // Oops referenced by the system dictionary may get unreachable independently | |
| 1703 // of the class loader (eg. cached protection domain oops). So we need to | |
| 1704 // explicitly unlink them here instead of in Dictionary::do_unloading. | |
| 1705 dictionary()->unlink(is_alive); | |
| 1706 #ifdef ASSERT | |
| 1707 VerifySDReachableAndLiveClosure cl(is_alive); | |
| 1708 dictionary()->oops_do(&cl); | |
| 1709 #endif | |
|
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1710 return unloading_occurred; |
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1711 } |
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1712 |
|
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1713 void SystemDictionary::roots_oops_do(OopClosure* strong, OopClosure* weak) { |
|
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1714 strong->do_oop(&_java_system_loader); |
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1715 strong->do_oop(&_system_loader_lock_obj); |
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1716 CDS_ONLY(SystemDictionaryShared::roots_oops_do(strong);) |
|
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1717 |
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1718 // Adjust dictionary |
|
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1719 dictionary()->roots_oops_do(strong, weak); |
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1720 |
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1721 // Visit extra methods |
|
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1722 invoke_method_table()->oops_do(strong); |
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1723 } |
|
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1724 |
| 0 | 1725 void SystemDictionary::oops_do(OopClosure* f) { |
| 1726 f->do_oop(&_java_system_loader); | |
|
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1727 f->do_oop(&_system_loader_lock_obj); |
|
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1728 CDS_ONLY(SystemDictionaryShared::oops_do(f);) |
| 0 | 1729 |
| 1730 // Adjust dictionary | |
| 1731 dictionary()->oops_do(f); | |
| 1732 | |
| 710 | 1733 // Visit extra methods |
| 1903 | 1734 invoke_method_table()->oops_do(f); |
| 0 | 1735 } |
| 1736 | |
|
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1737 // Extended Class redefinition support. |
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1738 // If one of these classes is replaced, we need to replace it in these places. |
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1739 // KlassClosure::do_klass should take the address of a class but we can |
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1740 // change that later. |
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1741 void SystemDictionary::preloaded_classes_do(KlassClosure* f) { |
|
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1742 for (int k = (int)FIRST_WKID; k < (int)WKID_LIMIT; k++) { |
|
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1743 f->do_klass(_well_known_klasses[k]); |
|
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1744 } |
| 0 | 1745 |
| 1746 { | |
| 1747 for (int i = 0; i < T_VOID+1; i++) { | |
| 1748 if (_box_klasses[i] != NULL) { | |
| 1749 assert(i >= T_BOOLEAN, "checking"); | |
|
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1750 f->do_klass(_box_klasses[i]); |
| 0 | 1751 } |
| 1752 } | |
| 1753 } | |
| 1754 | |
|
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1755 FilteredFieldsMap::classes_do(f); |
| 0 | 1756 } |
| 1757 | |
|
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1758 void SystemDictionary::lazily_loaded_classes_do(KlassClosure* f) { |
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1759 f->do_klass(_abstract_ownable_synchronizer_klass); |
| 0 | 1760 } |
| 1761 | |
| 1762 // Just the classes from defining class loaders | |
| 1763 // Don't iterate over placeholders | |
|
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1764 void SystemDictionary::classes_do(void f(Klass*)) { |
| 0 | 1765 dictionary()->classes_do(f); |
| 1766 } | |
| 1767 | |
| 1768 // Added for initialize_itable_for_klass | |
| 1769 // Just the classes from defining class loaders | |
| 1770 // Don't iterate over placeholders | |
|
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1771 void SystemDictionary::classes_do(void f(Klass*, TRAPS), TRAPS) { |
| 0 | 1772 dictionary()->classes_do(f, CHECK); |
| 1773 } | |
| 1774 | |
| 1775 // All classes, and their class loaders | |
| 1776 // Don't iterate over placeholders | |
|
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1777 void SystemDictionary::classes_do(void f(Klass*, ClassLoaderData*)) { |
| 0 | 1778 dictionary()->classes_do(f); |
| 1779 } | |
| 1780 | |
|
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1781 void SystemDictionary::placeholders_do(void f(Symbol*)) { |
| 0 | 1782 placeholders()->entries_do(f); |
| 1783 } | |
| 1784 | |
|
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1785 void SystemDictionary::methods_do(void f(Method*)) { |
| 0 | 1786 dictionary()->methods_do(f); |
| 1903 | 1787 invoke_method_table()->methods_do(f); |
| 0 | 1788 } |
| 1789 | |
|
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1790 void SystemDictionary::remove_classes_in_error_state() { |
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1791 dictionary()->remove_classes_in_error_state(); |
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1792 } |
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1793 |
| 0 | 1794 // ---------------------------------------------------------------------------- |
| 1795 // Lazily load klasses | |
| 1796 | |
| 1797 void SystemDictionary::load_abstract_ownable_synchronizer_klass(TRAPS) { | |
| 1798 assert(JDK_Version::is_gte_jdk16x_version(), "Must be JDK 1.6 or later"); | |
| 1799 | |
| 1800 // if multiple threads calling this function, only one thread will load | |
| 1801 // the class. The other threads will find the loaded version once the | |
| 1802 // class is loaded. | |
|
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1803 Klass* aos = _abstract_ownable_synchronizer_klass; |
| 0 | 1804 if (aos == NULL) { |
|
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1805 Klass* k = resolve_or_fail(vmSymbols::java_util_concurrent_locks_AbstractOwnableSynchronizer(), true, CHECK); |
| 0 | 1806 // Force a fence to prevent any read before the write completes |
| 1807 OrderAccess::fence(); | |
| 1808 _abstract_ownable_synchronizer_klass = k; | |
| 1809 } | |
| 1810 } | |
| 1811 | |
| 1812 // ---------------------------------------------------------------------------- | |
| 1813 // Initialization | |
| 1814 | |
| 1815 void SystemDictionary::initialize(TRAPS) { | |
| 1816 // Allocate arrays | |
| 1817 assert(dictionary() == NULL, | |
| 1818 "SystemDictionary should only be initialized once"); | |
|
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1819 _sdgeneration = 0; |
|
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1820 _dictionary = new Dictionary(calculate_systemdictionary_size(PredictedLoadedClassCount)); |
| 1903 | 1821 _placeholders = new PlaceholderTable(_nof_buckets); |
| 0 | 1822 _number_of_modifications = 0; |
| 1903 | 1823 _loader_constraints = new LoaderConstraintTable(_loader_constraint_size); |
| 1824 _resolution_errors = new ResolutionErrorTable(_resolution_error_size); | |
| 1825 _invoke_method_table = new SymbolPropertyTable(_invoke_method_size); | |
| 0 | 1826 |
| 1827 // Allocate private object used as system class loader lock | |
|
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1828 _system_loader_lock_obj = oopFactory::new_intArray(0, CHECK); |
| 0 | 1829 // Initialize basic classes |
| 1830 initialize_preloaded_classes(CHECK); | |
| 1831 } | |
| 1832 | |
|
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1833 // Compact table of directions on the initialization of klasses: |
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1834 static const short wk_init_info[] = { |
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1835 #define WK_KLASS_INIT_INFO(name, symbol, option) \ |
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1836 ( ((int)vmSymbols::VM_SYMBOL_ENUM_NAME(symbol) \ |
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1837 << SystemDictionary::CEIL_LG_OPTION_LIMIT) \ |
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1838 | (int)SystemDictionary::option ), |
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1839 WK_KLASSES_DO(WK_KLASS_INIT_INFO) |
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1840 #undef WK_KLASS_INIT_INFO |
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1841 0 |
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1842 }; |
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1843 |
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1844 bool SystemDictionary::initialize_wk_klass(WKID id, int init_opt, TRAPS) { |
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1845 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1846 int info = wk_init_info[id - FIRST_WKID]; |
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1847 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1848 Symbol* symbol = vmSymbols::symbol_at((vmSymbols::SID)sid); |
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1849 Klass** klassp = &_well_known_klasses[id]; |
| 2460 | 1850 bool must_load = (init_opt < SystemDictionary::Opt); |
| 7951 | 1851 if ((*klassp) == NULL) { |
|
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1852 if (must_load) { |
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1853 (*klassp) = resolve_or_fail(symbol, true, CHECK_0); // load required class |
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1854 } else { |
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1855 (*klassp) = resolve_or_null(symbol, CHECK_0); // load optional klass |
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1856 } |
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1857 } |
| 2460 | 1858 return ((*klassp) != NULL); |
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1859 } |
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1860 |
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1861 void SystemDictionary::initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS) { |
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1862 assert((int)start_id <= (int)limit_id, "IDs are out of order!"); |
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1863 for (int id = (int)start_id; id < (int)limit_id; id++) { |
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1864 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1865 int info = wk_init_info[id - FIRST_WKID]; |
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1866 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1867 int opt = (info & right_n_bits(CEIL_LG_OPTION_LIMIT)); |
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1868 |
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1869 initialize_wk_klass((WKID)id, opt, CHECK); |
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1870 } |
| 710 | 1871 |
| 1872 // move the starting value forward to the limit: | |
| 1873 start_id = limit_id; | |
|
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1874 } |
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1875 |
| 0 | 1876 void SystemDictionary::initialize_preloaded_classes(TRAPS) { |
| 1142 | 1877 assert(WK_KLASS(Object_klass) == NULL, "preloaded classes should only be initialized once"); |
| 0 | 1878 // Preload commonly used klasses |
|
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1879 WKID scan = FIRST_WKID; |
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1880 // first do Object, then String, Class |
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1881 if (UseSharedSpaces) { |
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1882 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Object_klass), scan, CHECK); |
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1883 // Initialize the constant pool for the Object_class |
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1884 InstanceKlass* ik = InstanceKlass::cast(Object_klass()); |
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1885 ik->constants()->restore_unshareable_info(CHECK); |
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1886 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Class_klass), scan, CHECK); |
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1887 } else { |
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1888 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Class_klass), scan, CHECK); |
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1889 } |
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1890 |
| 6057 | 1891 // Calculate offsets for String and Class classes since they are loaded and |
| 1892 // can be used after this point. | |
| 1893 java_lang_String::compute_offsets(); | |
| 3938 | 1894 java_lang_Class::compute_offsets(); |
|
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1895 |
| 0 | 1896 // Fixup mirrors for classes loaded before java.lang.Class. |
| 1897 // These calls iterate over the objects currently in the perm gen | |
| 1898 // so calling them at this point is matters (not before when there | |
| 1899 // are fewer objects and not later after there are more objects | |
| 1900 // in the perm gen. | |
| 1901 Universe::initialize_basic_type_mirrors(CHECK); | |
| 1902 Universe::fixup_mirrors(CHECK); | |
| 1903 | |
|
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1904 // do a bunch more: |
| 1142 | 1905 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Reference_klass), scan, CHECK); |
| 0 | 1906 |
| 1907 // Preload ref klasses and set reference types | |
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1908 InstanceKlass::cast(WK_KLASS(Reference_klass))->set_reference_type(REF_OTHER); |
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1909 InstanceRefKlass::update_nonstatic_oop_maps(WK_KLASS(Reference_klass)); |
| 0 | 1910 |
| 20755 | 1911 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Cleaner_klass), scan, CHECK); |
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1912 InstanceKlass::cast(WK_KLASS(SoftReference_klass))->set_reference_type(REF_SOFT); |
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1913 InstanceKlass::cast(WK_KLASS(WeakReference_klass))->set_reference_type(REF_WEAK); |
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1914 InstanceKlass::cast(WK_KLASS(FinalReference_klass))->set_reference_type(REF_FINAL); |
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1915 InstanceKlass::cast(WK_KLASS(PhantomReference_klass))->set_reference_type(REF_PHANTOM); |
| 20755 | 1916 InstanceKlass::cast(WK_KLASS(Cleaner_klass))->set_reference_type(REF_CLEANER); |
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1917 |
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1918 // JSR 292 classes |
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1919 WKID jsr292_group_start = WK_KLASS_ENUM_NAME(MethodHandle_klass); |
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1920 WKID jsr292_group_end = WK_KLASS_ENUM_NAME(VolatileCallSite_klass); |
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1921 initialize_wk_klasses_until(jsr292_group_start, scan, CHECK); |
|
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1922 if (EnableInvokeDynamic) { |
|
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1923 initialize_wk_klasses_through(jsr292_group_end, scan, CHECK); |
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1924 } else { |
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1925 // Skip the JSR 292 classes, if not enabled. |
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1926 scan = WKID(jsr292_group_end + 1); |
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1927 } |
| 710 | 1928 |
|
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1929 initialize_wk_klasses_until(WKID_LIMIT, scan, CHECK); |
| 0 | 1930 |
| 1142 | 1931 _box_klasses[T_BOOLEAN] = WK_KLASS(Boolean_klass); |
| 1932 _box_klasses[T_CHAR] = WK_KLASS(Character_klass); | |
| 1933 _box_klasses[T_FLOAT] = WK_KLASS(Float_klass); | |
| 1934 _box_klasses[T_DOUBLE] = WK_KLASS(Double_klass); | |
| 1935 _box_klasses[T_BYTE] = WK_KLASS(Byte_klass); | |
| 1936 _box_klasses[T_SHORT] = WK_KLASS(Short_klass); | |
| 1937 _box_klasses[T_INT] = WK_KLASS(Integer_klass); | |
| 1938 _box_klasses[T_LONG] = WK_KLASS(Long_klass); | |
|
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1939 //_box_klasses[T_OBJECT] = WK_KLASS(object_klass); |
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1940 //_box_klasses[T_ARRAY] = WK_KLASS(object_klass); |
| 0 | 1941 |
| 1942 { // Compute whether we should use loadClass or loadClassInternal when loading classes. | |
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1943 Method* method = InstanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::loadClassInternal_name(), vmSymbols::string_class_signature()); |
| 0 | 1944 _has_loadClassInternal = (method != NULL); |
| 1945 } | |
| 1946 { // Compute whether we should use checkPackageAccess or NOT | |
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1947 Method* method = InstanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::checkPackageAccess_name(), vmSymbols::class_protectiondomain_signature()); |
| 0 | 1948 _has_checkPackageAccess = (method != NULL); |
| 1949 } | |
| 1950 } | |
| 1951 | |
| 1952 // Tells if a given klass is a box (wrapper class, such as java.lang.Integer). | |
| 1953 // If so, returns the basic type it holds. If not, returns T_OBJECT. | |
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1954 BasicType SystemDictionary::box_klass_type(Klass* k) { |
| 0 | 1955 assert(k != NULL, ""); |
| 1956 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { | |
| 1957 if (_box_klasses[i] == k) | |
| 1958 return (BasicType)i; | |
| 1959 } | |
| 1960 return T_OBJECT; | |
| 1961 } | |
| 1962 | |
| 1963 // Constraints on class loaders. The details of the algorithm can be | |
| 1964 // found in the OOPSLA'98 paper "Dynamic Class Loading in the Java | |
| 1965 // Virtual Machine" by Sheng Liang and Gilad Bracha. The basic idea is | |
| 1966 // that the system dictionary needs to maintain a set of contraints that | |
| 1967 // must be satisfied by all classes in the dictionary. | |
| 1968 // if defining is true, then LinkageError if already in systemDictionary | |
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1969 // if initiating loader, then ok if InstanceKlass matches existing entry |
| 0 | 1970 |
| 1971 void SystemDictionary::check_constraints(int d_index, unsigned int d_hash, | |
| 1972 instanceKlassHandle k, | |
| 1973 Handle class_loader, bool defining, | |
| 1974 TRAPS) { | |
| 1975 const char *linkage_error = NULL; | |
| 1976 { | |
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1977 Symbol* name = k->name(); |
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1978 ClassLoaderData *loader_data = class_loader_data(class_loader); |
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1979 |
| 0 | 1980 MutexLocker mu(SystemDictionary_lock, THREAD); |
| 1981 | |
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1982 Klass* check = find_class(d_index, d_hash, name, loader_data); |
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1983 if (check != (Klass*)NULL) { |
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1984 // if different InstanceKlass - duplicate class definition, |
| 0 | 1985 // else - ok, class loaded by a different thread in parallel, |
| 1986 // we should only have found it if it was done loading and ok to use | |
| 1987 // system dictionary only holds instance classes, placeholders | |
| 1988 // also holds array classes | |
| 1989 | |
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1990 assert(check->oop_is_instance(), "noninstance in systemdictionary"); |
| 0 | 1991 if ((defining == true) || (k() != check)) { |
| 1992 linkage_error = "loader (instance of %s): attempted duplicate class " | |
| 1993 "definition for name: \"%s\""; | |
| 1994 } else { | |
| 1995 return; | |
| 1996 } | |
| 1997 } | |
| 1998 | |
| 1999 #ifdef ASSERT | |
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2000 Symbol* ph_check = find_placeholder(name, loader_data); |
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2001 assert(ph_check == NULL || ph_check == name, "invalid symbol"); |
| 0 | 2002 #endif |
| 2003 | |
| 2004 if (linkage_error == NULL) { | |
| 2005 if (constraints()->check_or_update(k, class_loader, name) == false) { | |
| 2006 linkage_error = "loader constraint violation: loader (instance of %s)" | |
| 2007 " previously initiated loading for a different type with name \"%s\""; | |
| 2008 } | |
| 2009 } | |
| 2010 } | |
| 2011 | |
| 2012 // Throw error now if needed (cannot throw while holding | |
| 2013 // SystemDictionary_lock because of rank ordering) | |
| 2014 | |
| 2015 if (linkage_error) { | |
| 2016 ResourceMark rm(THREAD); | |
| 2017 const char* class_loader_name = loader_name(class_loader()); | |
| 2018 char* type_name = k->name()->as_C_string(); | |
| 2019 size_t buflen = strlen(linkage_error) + strlen(class_loader_name) + | |
| 2020 strlen(type_name); | |
| 2021 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
| 2022 jio_snprintf(buf, buflen, linkage_error, class_loader_name, type_name); | |
| 2023 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); | |
| 2024 } | |
| 2025 } | |
| 2026 | |
| 2027 | |
| 2028 // Update system dictionary - done after check_constraint and add_to_hierachy | |
| 2029 // have been called. | |
| 2030 void SystemDictionary::update_dictionary(int d_index, unsigned int d_hash, | |
| 2031 int p_index, unsigned int p_hash, | |
| 2032 instanceKlassHandle k, | |
| 2033 Handle class_loader, | |
| 2034 TRAPS) { | |
| 2035 // Compile_lock prevents systemDictionary updates during compilations | |
| 2036 assert_locked_or_safepoint(Compile_lock); | |
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2037 Symbol* name = k->name(); |
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2038 ClassLoaderData *loader_data = class_loader_data(class_loader); |
| 0 | 2039 |
| 2040 { | |
| 2041 MutexLocker mu1(SystemDictionary_lock, THREAD); | |
| 2042 | |
| 2043 // See whether biased locking is enabled and if so set it for this | |
| 2044 // klass. | |
| 2045 // Note that this must be done past the last potential blocking | |
| 2046 // point / safepoint. We enable biased locking lazily using a | |
| 2047 // VM_Operation to iterate the SystemDictionary and installing the | |
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2048 // biasable mark word into each InstanceKlass's prototype header. |
| 0 | 2049 // To avoid race conditions where we accidentally miss enabling the |
| 2050 // optimization for one class in the process of being added to the | |
| 2051 // dictionary, we must not safepoint after the test of | |
| 2052 // BiasedLocking::enabled(). | |
| 2053 if (UseBiasedLocking && BiasedLocking::enabled()) { | |
| 2054 // Set biased locking bit for all loaded classes; it will be | |
| 2055 // cleared if revocation occurs too often for this type | |
| 2056 // NOTE that we must only do this when the class is initally | |
| 2057 // defined, not each time it is referenced from a new class loader | |
| 2058 if (k->class_loader() == class_loader()) { | |
| 2059 k->set_prototype_header(markOopDesc::biased_locking_prototype()); | |
| 2060 } | |
| 2061 } | |
| 2062 | |
|
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2063 // Make a new system dictionary entry. |
|
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2064 Klass* sd_check = find_class(d_index, d_hash, name, loader_data); |
| 0 | 2065 if (sd_check == NULL) { |
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2066 dictionary()->add_klass(name, loader_data, k); |
| 0 | 2067 notice_modification(); |
| 2068 } | |
| 2069 #ifdef ASSERT | |
|
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2070 sd_check = find_class(d_index, d_hash, name, loader_data); |
| 0 | 2071 assert (sd_check != NULL, "should have entry in system dictionary"); |
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2072 // Note: there may be a placeholder entry: for circularity testing |
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2073 // or for parallel defines |
| 0 | 2074 #endif |
| 2075 SystemDictionary_lock->notify_all(); | |
| 2076 } | |
| 2077 } | |
| 2078 | |
| 2079 | |
|
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2080 // Try to find a class name using the loader constraints. The |
|
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2081 // loader constraints might know about a class that isn't fully loaded |
|
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2082 // yet and these will be ignored. |
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2083 Klass* SystemDictionary::find_constrained_instance_or_array_klass( |
|
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2084 Symbol* class_name, Handle class_loader, TRAPS) { |
| 0 | 2085 |
| 2086 // First see if it has been loaded directly. | |
| 2087 // Force the protection domain to be null. (This removes protection checks.) | |
| 2088 Handle no_protection_domain; | |
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2089 Klass* klass = find_instance_or_array_klass(class_name, class_loader, |
|
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2090 no_protection_domain, CHECK_NULL); |
| 0 | 2091 if (klass != NULL) |
| 2092 return klass; | |
| 2093 | |
| 2094 // Now look to see if it has been loaded elsewhere, and is subject to | |
| 2095 // a loader constraint that would require this loader to return the | |
| 2096 // klass that is already loaded. | |
|
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2097 if (FieldType::is_array(class_name)) { |
|
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2098 // For array classes, their Klass*s are not kept in the |
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2099 // constraint table. The element Klass*s are. |
|
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2100 FieldArrayInfo fd; |
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2101 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
| 0 | 2102 if (t != T_OBJECT) { |
| 2103 klass = Universe::typeArrayKlassObj(t); | |
| 2104 } else { | |
| 2105 MutexLocker mu(SystemDictionary_lock, THREAD); | |
|
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2106 klass = constraints()->find_constrained_klass(fd.object_key(), class_loader); |
| 0 | 2107 } |
| 1336 | 2108 // If element class already loaded, allocate array klass |
| 0 | 2109 if (klass != NULL) { |
| 6983 | 2110 klass = klass->array_klass_or_null(fd.dimension()); |
| 0 | 2111 } |
| 2112 } else { | |
| 2113 MutexLocker mu(SystemDictionary_lock, THREAD); | |
| 2114 // Non-array classes are easy: simply check the constraint table. | |
| 2115 klass = constraints()->find_constrained_klass(class_name, class_loader); | |
| 2116 } | |
| 2117 | |
| 2118 return klass; | |
| 2119 } | |
| 2120 | |
| 2121 | |
|
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|
2122 bool SystemDictionary::add_loader_constraint(Symbol* class_name, |
| 0 | 2123 Handle class_loader1, |
| 2124 Handle class_loader2, | |
| 2125 Thread* THREAD) { | |
|
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2126 ClassLoaderData* loader_data1 = class_loader_data(class_loader1); |
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2127 ClassLoaderData* loader_data2 = class_loader_data(class_loader2); |
|
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2128 |
|
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|
2129 Symbol* constraint_name = NULL; |
|
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|
2130 if (!FieldType::is_array(class_name)) { |
| 1336 | 2131 constraint_name = class_name; |
| 2132 } else { | |
|
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2133 // For array classes, their Klass*s are not kept in the |
| 1336 | 2134 // constraint table. The element classes are. |
|
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2135 FieldArrayInfo fd; |
|
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|
2136 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(false)); |
| 1336 | 2137 // primitive types always pass |
| 2138 if (t != T_OBJECT) { | |
| 2139 return true; | |
| 2140 } else { | |
|
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|
2141 constraint_name = fd.object_key(); |
| 1336 | 2142 } |
| 2143 } | |
|
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|
2144 unsigned int d_hash1 = dictionary()->compute_hash(constraint_name, loader_data1); |
| 0 | 2145 int d_index1 = dictionary()->hash_to_index(d_hash1); |
| 2146 | |
|
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|
2147 unsigned int d_hash2 = dictionary()->compute_hash(constraint_name, loader_data2); |
| 0 | 2148 int d_index2 = dictionary()->hash_to_index(d_hash2); |
| 2149 { | |
| 1336 | 2150 MutexLocker mu_s(SystemDictionary_lock, THREAD); |
| 0 | 2151 |
| 1336 | 2152 // Better never do a GC while we're holding these oops |
| 2153 No_Safepoint_Verifier nosafepoint; | |
| 0 | 2154 |
|
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2155 Klass* klass1 = find_class(d_index1, d_hash1, constraint_name, loader_data1); |
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2156 Klass* klass2 = find_class(d_index2, d_hash2, constraint_name, loader_data2); |
| 1336 | 2157 return constraints()->add_entry(constraint_name, klass1, class_loader1, |
| 2158 klass2, class_loader2); | |
| 0 | 2159 } |
| 2160 } | |
| 2161 | |
| 2162 // Add entry to resolution error table to record the error when the first | |
| 2163 // attempt to resolve a reference to a class has failed. | |
|
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|
2164 void SystemDictionary::add_resolution_error(constantPoolHandle pool, int which, Symbol* error) { |
| 0 | 2165 unsigned int hash = resolution_errors()->compute_hash(pool, which); |
| 2166 int index = resolution_errors()->hash_to_index(hash); | |
| 2167 { | |
| 2168 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
| 2169 resolution_errors()->add_entry(index, hash, pool, which, error); | |
| 2170 } | |
| 2171 } | |
| 2172 | |
|
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2173 // Delete a resolution error for RedefineClasses for a constant pool is going away |
|
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2174 void SystemDictionary::delete_resolution_error(ConstantPool* pool) { |
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2175 resolution_errors()->delete_entry(pool); |
|
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2176 } |
|
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2177 |
| 0 | 2178 // Lookup resolution error table. Returns error if found, otherwise NULL. |
|
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|
2179 Symbol* SystemDictionary::find_resolution_error(constantPoolHandle pool, int which) { |
| 0 | 2180 unsigned int hash = resolution_errors()->compute_hash(pool, which); |
| 2181 int index = resolution_errors()->hash_to_index(hash); | |
| 2182 { | |
| 2183 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
| 2184 ResolutionErrorEntry* entry = resolution_errors()->find_entry(index, hash, pool, which); | |
|
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2185 return (entry != NULL) ? entry->error() : (Symbol*)NULL; |
| 0 | 2186 } |
| 2187 } | |
| 2188 | |
| 2189 | |
|
665
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2190 // Signature constraints ensure that callers and callees agree about |
|
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|
2191 // the meaning of type names in their signatures. This routine is the |
|
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|
2192 // intake for constraints. It collects them from several places: |
|
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|
2193 // |
|
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2194 // * LinkResolver::resolve_method (if check_access is true) requires |
|
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|
2195 // that the resolving class (the caller) and the defining class of |
|
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|
2196 // the resolved method (the callee) agree on each type in the |
|
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|
2197 // method's signature. |
|
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2198 // |
|
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2199 // * LinkResolver::resolve_interface_method performs exactly the same |
|
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2200 // checks. |
|
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|
2201 // |
|
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2202 // * LinkResolver::resolve_field requires that the constant pool |
|
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2203 // attempting to link to a field agree with the field's defining |
|
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2204 // class about the type of the field signature. |
|
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2205 // |
|
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2206 // * klassVtable::initialize_vtable requires that, when a class |
|
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2207 // overrides a vtable entry allocated by a superclass, that the |
|
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2208 // overriding method (i.e., the callee) agree with the superclass |
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|
2209 // on each type in the method's signature. |
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2210 // |
|
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2211 // * klassItable::initialize_itable requires that, when a class fills |
|
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|
2212 // in its itables, for each non-abstract method installed in an |
|
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|
2213 // itable, the method (i.e., the callee) agree with the interface |
|
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2214 // on each type in the method's signature. |
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2215 // |
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2216 // All those methods have a boolean (check_access, checkconstraints) |
|
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|
2217 // which turns off the checks. This is used from specialized contexts |
|
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2218 // such as bootstrapping, dumping, and debugging. |
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2219 // |
|
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2220 // No direct constraint is placed between the class and its |
|
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2221 // supertypes. Constraints are only placed along linked relations |
|
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2222 // between callers and callees. When a method overrides or implements |
|
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2223 // an abstract method in a supertype (superclass or interface), the |
|
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2224 // constraints are placed as if the supertype were the caller to the |
|
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2225 // overriding method. (This works well, since callers to the |
|
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2226 // supertype have already established agreement between themselves and |
|
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2227 // the supertype.) As a result of all this, a class can disagree with |
|
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2228 // its supertype about the meaning of a type name, as long as that |
|
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2229 // class neither calls a relevant method of the supertype, nor is |
|
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2230 // called (perhaps via an override) from the supertype. |
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2231 // |
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2232 // |
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2233 // SystemDictionary::check_signature_loaders(sig, l1, l2) |
|
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2234 // |
| 0 | 2235 // Make sure all class components (including arrays) in the given |
| 2236 // signature will be resolved to the same class in both loaders. | |
| 2237 // Returns the name of the type that failed a loader constraint check, or | |
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2238 // NULL if no constraint failed. No exception except OOME is thrown. |
| 1336 | 2239 // Arrays are not added to the loader constraint table, their elements are. |
|
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|
2240 Symbol* SystemDictionary::check_signature_loaders(Symbol* signature, |
| 0 | 2241 Handle loader1, Handle loader2, |
| 2242 bool is_method, TRAPS) { | |
| 2243 // Nothing to do if loaders are the same. | |
| 2244 if (loader1() == loader2()) { | |
| 2245 return NULL; | |
| 2246 } | |
| 2247 | |
| 2248 SignatureStream sig_strm(signature, is_method); | |
| 2249 while (!sig_strm.is_done()) { | |
| 2250 if (sig_strm.is_object()) { | |
|
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|
2251 Symbol* sig = sig_strm.as_symbol(CHECK_NULL); |
| 0 | 2252 if (!add_loader_constraint(sig, loader1, loader2, THREAD)) { |
|
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|
2253 return sig; |
| 0 | 2254 } |
| 2255 } | |
| 2256 sig_strm.next(); | |
| 2257 } | |
| 2258 return NULL; | |
| 2259 } | |
| 2260 | |
| 2261 | |
|
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|
2262 methodHandle SystemDictionary::find_method_handle_intrinsic(vmIntrinsics::ID iid, |
|
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|
2263 Symbol* signature, |
|
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|
2264 TRAPS) { |
|
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|
2265 methodHandle empty; |
|
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|
2266 assert(EnableInvokeDynamic, ""); |
|
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|
2267 assert(MethodHandles::is_signature_polymorphic(iid) && |
|
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2268 MethodHandles::is_signature_polymorphic_intrinsic(iid) && |
|
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|
2269 iid != vmIntrinsics::_invokeGeneric, |
|
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|
2270 err_msg("must be a known MH intrinsic iid=%d: %s", iid, vmIntrinsics::name_at(iid))); |
|
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|
2271 |
|
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|
2272 unsigned int hash = invoke_method_table()->compute_hash(signature, iid); |
| 710 | 2273 int index = invoke_method_table()->hash_to_index(hash); |
|
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2274 SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, iid); |
|
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2275 methodHandle m; |
|
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2276 if (spe == NULL || spe->method() == NULL) { |
|
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|
2277 spe = NULL; |
| 710 | 2278 // Must create lots of stuff here, but outside of the SystemDictionary lock. |
|
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2279 m = Method::make_method_handle_intrinsic(iid, signature, CHECK_(empty)); |
|
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|
2280 if (!Arguments::is_interpreter_only()) { |
|
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|
2281 // Generate a compiled form of the MH intrinsic. |
|
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|
2282 AdapterHandlerLibrary::create_native_wrapper(m); |
|
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|
2283 // Check if have the compiled code. |
|
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|
2284 if (!m->has_compiled_code()) { |
|
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|
2285 THROW_MSG_(vmSymbols::java_lang_VirtualMachineError(), |
|
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|
2286 "out of space in CodeCache for method handle intrinsic", empty); |
|
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|
2287 } |
|
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2288 } |
| 710 | 2289 // Now grab the lock. We might have to throw away the new method, |
| 2290 // if a racing thread has managed to install one at the same time. | |
|
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2291 { |
|
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|
2292 MutexLocker ml(SystemDictionary_lock, THREAD); |
|
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2293 spe = invoke_method_table()->find_entry(index, hash, signature, iid); |
| 710 | 2294 if (spe == NULL) |
|
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2295 spe = invoke_method_table()->add_entry(index, hash, signature, iid); |
|
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2296 if (spe->method() == NULL) |
|
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2297 spe->set_method(m()); |
|
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2298 } |
|
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|
2299 } |
|
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|
2300 |
|
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|
2301 assert(spe != NULL && spe->method() != NULL, ""); |
|
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|
2302 assert(Arguments::is_interpreter_only() || (spe->method()->has_compiled_code() && |
|
20432
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|
2303 spe->method()->code()->entry_point() == spe->method()->from_compiled_entry()), |
|
aff6ccb506cb
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|
2304 "MH intrinsic invariant"); |
|
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2305 return spe->method(); |
|
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|
2306 } |
|
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|
2307 |
|
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|
2308 // Helper for unpacking the return value from linkMethod and linkCallSite. |
|
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|
2309 static methodHandle unpack_method_and_appendix(Handle mname, |
|
7185
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|
2310 KlassHandle accessing_klass, |
|
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|
2311 objArrayHandle appendix_box, |
|
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|
2312 Handle* appendix_result, |
|
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|
2313 TRAPS) { |
|
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|
2314 methodHandle empty; |
|
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|
2315 if (mname.not_null()) { |
|
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|
2316 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); |
|
6266
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|
2317 if (vmtarget != NULL && vmtarget->is_method()) { |
|
6725
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|
2318 Method* m = (Method*)vmtarget; |
|
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|
2319 oop appendix = appendix_box->obj_at(0); |
|
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|
2320 if (TraceMethodHandles) { |
|
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|
2321 #ifndef PRODUCT |
|
17937
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8037816: Fix for 8036122 breaks build with Xcode5/clang
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17883
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|
2322 tty->print("Linked method=" INTPTR_FORMAT ": ", p2i(m)); |
|
6266
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|
2323 m->print(); |
|
1d7922586cf6
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|
2324 if (appendix != NULL) { tty->print("appendix = "); appendix->print(); } |
|
1d7922586cf6
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|
2325 tty->cr(); |
|
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|
2326 #endif //PRODUCT |
|
3363
167b70ff3abc
6939861: JVM should handle more conversion operations
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diff
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|
2327 } |
|
6266
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|
2328 (*appendix_result) = Handle(THREAD, appendix); |
|
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|
2329 // the target is stored in the cpCache and if a reference to this |
|
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|
2330 // MethodName is dropped we need a way to make sure the |
|
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|
2331 // class_loader containing this method is kept alive. |
|
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|
2332 // FIXME: the appendix might also preserve this dependency. |
|
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|
2333 ClassLoaderData* this_key = InstanceKlass::cast(accessing_klass())->class_loader_data(); |
|
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|
2334 this_key->record_dependency(m->method_holder(), CHECK_NULL); // Can throw OOM |
|
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|
2335 return methodHandle(THREAD, m); |
| 710 | 2336 } |
| 2337 } | |
|
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|
2338 THROW_MSG_(vmSymbols::java_lang_LinkageError(), "bad value from MethodHandleNatives", empty); |
|
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|
2339 return empty; |
|
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|
2340 } |
|
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|
2341 |
|
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|
2342 methodHandle SystemDictionary::find_method_handle_invoker(Symbol* name, |
|
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|
2343 Symbol* signature, |
|
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|
2344 KlassHandle accessing_klass, |
|
6822
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|
2345 Handle *appendix_result, |
|
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|
2346 Handle *method_type_result, |
|
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|
2347 TRAPS) { |
|
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|
2348 methodHandle empty; |
|
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|
2349 assert(EnableInvokeDynamic, ""); |
|
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|
2350 assert(!THREAD->is_Compiler_thread(), ""); |
|
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|
2351 Handle method_type = |
|
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|
2352 SystemDictionary::find_method_handle_type(signature, accessing_klass, CHECK_(empty)); |
|
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|
2353 if (false) { // FIXME: Decide if the Java upcall should resolve signatures. |
|
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|
2354 method_type = java_lang_String::create_from_symbol(signature, CHECK_(empty)); |
|
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|
2355 } |
|
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|
2356 |
|
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|
2357 KlassHandle mh_klass = SystemDictionary::MethodHandle_klass(); |
|
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|
2358 int ref_kind = JVM_REF_invokeVirtual; |
|
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|
2359 Handle name_str = StringTable::intern(name, CHECK_(empty)); |
|
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|
2360 objArrayHandle appendix_box = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1, CHECK_(empty)); |
|
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|
2361 assert(appendix_box->obj_at(0) == NULL, ""); |
|
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|
2362 |
|
12970
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|
2363 // This should not happen. JDK code should take care of that. |
|
1c90f0072f0d
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|
2364 if (accessing_klass.is_null() || method_type.is_null()) { |
|
1c90f0072f0d
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|
2365 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad invokehandle", empty); |
|
1c90f0072f0d
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|
2366 } |
|
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|
2367 |
|
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|
2368 // call java.lang.invoke.MethodHandleNatives::linkMethod(... String, MethodType) -> MemberName |
|
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|
2369 JavaCallArguments args; |
|
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|
2370 args.push_oop(accessing_klass()->java_mirror()); |
|
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|
2371 args.push_int(ref_kind); |
|
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|
2372 args.push_oop(mh_klass()->java_mirror()); |
|
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2373 args.push_oop(name_str()); |
|
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2374 args.push_oop(method_type()); |
|
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2375 args.push_oop(appendix_box()); |
|
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|
2376 JavaValue result(T_OBJECT); |
|
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|
2377 JavaCalls::call_static(&result, |
|
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|
2378 SystemDictionary::MethodHandleNatives_klass(), |
|
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2379 vmSymbols::linkMethod_name(), |
|
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|
2380 vmSymbols::linkMethod_signature(), |
|
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|
2381 &args, CHECK_(empty)); |
|
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|
2382 Handle mname(THREAD, (oop) result.get_jobject()); |
|
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|
2383 (*method_type_result) = method_type; |
|
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|
2384 return unpack_method_and_appendix(mname, accessing_klass, appendix_box, appendix_result, THREAD); |
| 710 | 2385 } |
| 2386 | |
|
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2387 |
|
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|
2388 // Ask Java code to find or construct a java.lang.invoke.MethodType for the given |
| 710 | 2389 // signature, as interpreted relative to the given class loader. |
| 2390 // Because of class loader constraints, all method handle usage must be | |
| 2391 // consistent with this loader. | |
|
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|
2392 Handle SystemDictionary::find_method_handle_type(Symbol* signature, |
|
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|
2393 KlassHandle accessing_klass, |
|
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|
2394 TRAPS) { |
|
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|
2395 Handle empty; |
|
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|
2396 vmIntrinsics::ID null_iid = vmIntrinsics::_none; // distinct from all method handle invoker intrinsics |
|
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2397 unsigned int hash = invoke_method_table()->compute_hash(signature, null_iid); |
|
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|
2398 int index = invoke_method_table()->hash_to_index(hash); |
|
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|
2399 SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, null_iid); |
|
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2400 if (spe != NULL && spe->method_type() != NULL) { |
|
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|
2401 assert(java_lang_invoke_MethodType::is_instance(spe->method_type()), ""); |
|
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2402 return Handle(THREAD, spe->method_type()); |
|
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|
2403 } else if (THREAD->is_Compiler_thread()) { |
|
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|
2404 warning("SystemDictionary::find_method_handle_type called from compiler thread"); // FIXME |
|
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|
2405 return Handle(); // do not attempt from within compiler, unless it was cached |
|
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|
2406 } |
|
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|
2407 |
|
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|
2408 Handle class_loader, protection_domain; |
|
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|
2409 bool is_on_bcp = true; // keep this true as long as we can materialize from the boot classloader |
|
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|
2410 int npts = ArgumentCount(signature).size(); |
| 1142 | 2411 objArrayHandle pts = oopFactory::new_objArray(SystemDictionary::Class_klass(), npts, CHECK_(empty)); |
| 710 | 2412 int arg = 0; |
| 2413 Handle rt; // the return type from the signature | |
|
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|
2414 ResourceMark rm(THREAD); |
|
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|
2415 for (SignatureStream ss(signature); !ss.is_done(); ss.next()) { |
|
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|
2416 oop mirror = NULL; |
|
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|
2417 if (is_on_bcp) { |
|
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|
2418 // Note: class_loader & protection_domain are both null at this point. |
|
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|
2419 mirror = ss.as_java_mirror(class_loader, protection_domain, |
|
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|
2420 SignatureStream::ReturnNull, CHECK_(empty)); |
|
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|
2421 if (mirror == NULL) { |
|
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|
2422 // fall back from BCP to accessing_klass |
|
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|
2423 if (accessing_klass.not_null()) { |
|
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|
2424 class_loader = Handle(THREAD, InstanceKlass::cast(accessing_klass())->class_loader()); |
|
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|
2425 protection_domain = Handle(THREAD, InstanceKlass::cast(accessing_klass())->protection_domain()); |
|
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|
2426 } |
|
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|
2427 is_on_bcp = false; |
|
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|
2428 } |
|
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|
2429 } |
|
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|
2430 if (!is_on_bcp) { |
|
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|
2431 // Resolve, throwing a real error if it doesn't work. |
|
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|
2432 mirror = ss.as_java_mirror(class_loader, protection_domain, |
|
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|
2433 SignatureStream::NCDFError, CHECK_(empty)); |
| 710 | 2434 } |
| 2435 if (ss.at_return_type()) | |
| 2436 rt = Handle(THREAD, mirror); | |
| 2437 else | |
| 2438 pts->obj_at_put(arg++, mirror); | |
|
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|
2439 |
|
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|
2440 // Check accessibility. |
|
2ffde6cfe049
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|
2441 if (ss.is_object() && accessing_klass.not_null()) { |
|
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|
2442 Klass* sel_klass = java_lang_Class::as_Klass(mirror); |
|
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|
2443 mirror = NULL; // safety |
|
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|
2444 // Emulate ConstantPool::verify_constant_pool_resolve. |
| 6983 | 2445 if (sel_klass->oop_is_objArray()) |
|
6831
d8ce2825b193
8000213: NPG: Should have renamed arrayKlass and typeArrayKlass
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6751
diff
changeset
|
2446 sel_klass = ObjArrayKlass::cast(sel_klass)->bottom_klass(); |
| 6983 | 2447 if (sel_klass->oop_is_instance()) { |
|
1508
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|
2448 KlassHandle sel_kh(THREAD, sel_klass); |
|
2ffde6cfe049
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|
2449 LinkResolver::check_klass_accessability(accessing_klass, sel_kh, CHECK_(empty)); |
|
2ffde6cfe049
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|
2450 } |
|
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|
2451 } |
| 710 | 2452 } |
| 2453 assert(arg == npts, ""); | |
| 2454 | |
|
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diff
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|
2455 // call java.lang.invoke.MethodHandleNatives::findMethodType(Class rt, Class[] pts) -> MethodType |
| 710 | 2456 JavaCallArguments args(Handle(THREAD, rt())); |
| 2457 args.push_oop(pts()); | |
| 2458 JavaValue result(T_OBJECT); | |
| 2459 JavaCalls::call_static(&result, | |
|
1507
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1339
diff
changeset
|
2460 SystemDictionary::MethodHandleNatives_klass(), |
|
cd5dbf694d45
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1339
diff
changeset
|
2461 vmSymbols::findMethodHandleType_name(), |
| 2460 | 2462 vmSymbols::findMethodHandleType_signature(), |
| 710 | 2463 &args, CHECK_(empty)); |
|
1793
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
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diff
changeset
|
2464 Handle method_type(THREAD, (oop) result.get_jobject()); |
|
d257356e35f0
6939224: MethodHandle.invokeGeneric needs to perform the correct set of conversions
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1660
diff
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|
2465 |
|
6266
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|
2466 if (is_on_bcp) { |
|
1d7922586cf6
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|
2467 // We can cache this MethodType inside the JVM. |
|
1d7922586cf6
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diff
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|
2468 MutexLocker ml(SystemDictionary_lock, THREAD); |
|
1d7922586cf6
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|
2469 spe = invoke_method_table()->find_entry(index, hash, signature, null_iid); |
|
1d7922586cf6
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|
2470 if (spe == NULL) |
|
1d7922586cf6
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diff
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|
2471 spe = invoke_method_table()->add_entry(index, hash, signature, null_iid); |
|
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|
2472 if (spe->method_type() == NULL) { |
|
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|
2473 spe->set_method_type(method_type()); |
|
1793
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diff
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|
2474 } |
|
d257356e35f0
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diff
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|
2475 } |
|
1508
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|
2476 |
|
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|
2477 // report back to the caller with the MethodType |
|
1793
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1660
diff
changeset
|
2478 return method_type; |
| 710 | 2479 } |
| 2480 | |
| 1602 | 2481 // Ask Java code to find or construct a method handle constant. |
| 2482 Handle SystemDictionary::link_method_handle_constant(KlassHandle caller, | |
| 2483 int ref_kind, //e.g., JVM_REF_invokeVirtual | |
| 2484 KlassHandle callee, | |
|
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|
2485 Symbol* name_sym, |
|
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|
2486 Symbol* signature, |
| 1602 | 2487 TRAPS) { |
| 2488 Handle empty; | |
|
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|
2489 Handle name = java_lang_String::create_from_symbol(name_sym, CHECK_(empty)); |
| 1602 | 2490 Handle type; |
| 2491 if (signature->utf8_length() > 0 && signature->byte_at(0) == '(') { | |
|
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|
2492 type = find_method_handle_type(signature, caller, CHECK_(empty)); |
|
12970
1c90f0072f0d
8026502: java/lang/invoke/MethodHandleConstants.java fails on all platforms
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12837
diff
changeset
|
2493 } else if (caller.is_null()) { |
|
1c90f0072f0d
8026502: java/lang/invoke/MethodHandleConstants.java fails on all platforms
twisti
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12837
diff
changeset
|
2494 // This should not happen. JDK code should take care of that. |
|
1c90f0072f0d
8026502: java/lang/invoke/MethodHandleConstants.java fails on all platforms
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12837
diff
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|
2495 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MH constant", empty); |
| 1602 | 2496 } else { |
|
2177
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|
2497 ResourceMark rm(THREAD); |
|
3582bf76420e
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diff
changeset
|
2498 SignatureStream ss(signature, false); |
| 1602 | 2499 if (!ss.is_done()) { |
| 2500 oop mirror = ss.as_java_mirror(caller->class_loader(), caller->protection_domain(), | |
| 2501 SignatureStream::NCDFError, CHECK_(empty)); | |
| 2502 type = Handle(THREAD, mirror); | |
| 2503 ss.next(); | |
| 2504 if (!ss.is_done()) type = Handle(); // error! | |
| 2505 } | |
| 2506 } | |
| 2507 if (type.is_null()) { | |
| 2508 THROW_MSG_(vmSymbols::java_lang_LinkageError(), "bad signature", empty); | |
| 2509 } | |
| 2510 | |
|
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|
2511 // call java.lang.invoke.MethodHandleNatives::linkMethodHandleConstant(Class caller, int refKind, Class callee, String name, Object type) -> MethodHandle |
| 1602 | 2512 JavaCallArguments args; |
| 2513 args.push_oop(caller->java_mirror()); // the referring class | |
| 2514 args.push_int(ref_kind); | |
| 2515 args.push_oop(callee->java_mirror()); // the target class | |
| 2516 args.push_oop(name()); | |
| 2517 args.push_oop(type()); | |
| 2518 JavaValue result(T_OBJECT); | |
| 2519 JavaCalls::call_static(&result, | |
| 2520 SystemDictionary::MethodHandleNatives_klass(), | |
| 2521 vmSymbols::linkMethodHandleConstant_name(), | |
| 2460 | 2522 vmSymbols::linkMethodHandleConstant_signature(), |
| 1602 | 2523 &args, CHECK_(empty)); |
| 2524 return Handle(THREAD, (oop) result.get_jobject()); | |
| 2525 } | |
| 710 | 2526 |
|
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|
2527 // Ask Java code to find or construct a java.lang.invoke.CallSite for the given |
|
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
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710
diff
changeset
|
2528 // name and signature, as interpreted relative to the given class loader. |
|
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|
2529 methodHandle SystemDictionary::find_dynamic_call_site_invoker(KlassHandle caller, |
|
1d7922586cf6
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6217
diff
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|
2530 Handle bootstrap_specifier, |
|
1d7922586cf6
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6217
diff
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|
2531 Symbol* name, |
|
1d7922586cf6
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6217
diff
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|
2532 Symbol* type, |
|
6822
f6b0eb4e44cf
7200949: JSR 292: rubybench/bench/time/bench_base64.rb fails with jruby.jar not on boot class path
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6751
diff
changeset
|
2533 Handle *appendix_result, |
|
f6b0eb4e44cf
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|
2534 Handle *method_type_result, |
|
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|
2535 TRAPS) { |
|
1d7922586cf6
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|
2536 methodHandle empty; |
|
1d7922586cf6
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|
2537 Handle bsm, info; |
|
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|
2538 if (java_lang_invoke_MethodHandle::is_instance(bootstrap_specifier())) { |
|
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|
2539 bsm = bootstrap_specifier; |
|
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|
2540 } else { |
|
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|
2541 assert(bootstrap_specifier->is_objArray(), ""); |
|
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|
2542 objArrayHandle args(THREAD, (objArrayOop) bootstrap_specifier()); |
|
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2543 int len = args->length(); |
|
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|
2544 assert(len >= 1, ""); |
|
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|
2545 bsm = Handle(THREAD, args->obj_at(0)); |
|
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|
2546 if (len > 1) { |
|
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|
2547 objArrayOop args1 = oopFactory::new_objArray(SystemDictionary::Object_klass(), len-1, CHECK_(empty)); |
|
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|
2548 for (int i = 1; i < len; i++) |
|
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2549 args1->obj_at_put(i-1, args->obj_at(i)); |
|
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2550 info = Handle(THREAD, args1); |
|
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|
2551 } |
|
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|
2552 } |
|
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|
2553 guarantee(java_lang_invoke_MethodHandle::is_instance(bsm()), |
|
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|
2554 "caller must supply a valid BSM"); |
|
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|
2555 |
|
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2556 Handle method_name = java_lang_String::create_from_symbol(name, CHECK_(empty)); |
|
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2557 Handle method_type = find_method_handle_type(type, caller, CHECK_(empty)); |
|
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2558 |
|
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|
2559 // This should not happen. JDK code should take care of that. |
|
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2560 if (caller.is_null() || method_type.is_null()) { |
|
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2561 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad invokedynamic", empty); |
|
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|
2562 } |
|
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|
2563 |
|
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|
2564 objArrayHandle appendix_box = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1, CHECK_(empty)); |
|
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|
2565 assert(appendix_box->obj_at(0) == NULL, ""); |
|
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2566 |
|
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|
2567 // call java.lang.invoke.MethodHandleNatives::linkCallSite(caller, bsm, name, mtype, info, &appendix) |
|
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|
2568 JavaCallArguments args; |
|
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|
2569 args.push_oop(caller->java_mirror()); |
|
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|
2570 args.push_oop(bsm()); |
|
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2571 args.push_oop(method_name()); |
|
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|
2572 args.push_oop(method_type()); |
|
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|
2573 args.push_oop(info()); |
|
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2574 args.push_oop(appendix_box); |
|
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|
2575 JavaValue result(T_OBJECT); |
|
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|
2576 JavaCalls::call_static(&result, |
|
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|
2577 SystemDictionary::MethodHandleNatives_klass(), |
|
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|
2578 vmSymbols::linkCallSite_name(), |
|
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|
2579 vmSymbols::linkCallSite_signature(), |
|
726
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|
2580 &args, CHECK_(empty)); |
|
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|
2581 Handle mname(THREAD, (oop) result.get_jobject()); |
|
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|
2582 (*method_type_result) = method_type; |
|
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|
2583 return unpack_method_and_appendix(mname, caller, appendix_box, appendix_result, THREAD); |
|
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|
2584 } |
|
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|
2585 |
| 0 | 2586 // Since the identity hash code for symbols changes when the symbols are |
| 2587 // moved from the regular perm gen (hash in the mark word) to the shared | |
| 2588 // spaces (hash is the address), the classes loaded into the dictionary | |
| 2589 // may be in the wrong buckets. | |
| 2590 | |
| 2591 void SystemDictionary::reorder_dictionary() { | |
| 2592 dictionary()->reorder_dictionary(); | |
| 2593 } | |
| 2594 | |
| 2595 | |
| 2596 void SystemDictionary::copy_buckets(char** top, char* end) { | |
| 2597 dictionary()->copy_buckets(top, end); | |
| 2598 } | |
| 2599 | |
| 2600 | |
| 2601 void SystemDictionary::copy_table(char** top, char* end) { | |
| 2602 dictionary()->copy_table(top, end); | |
| 2603 } | |
| 2604 | |
| 2605 | |
| 2606 void SystemDictionary::reverse() { | |
| 2607 dictionary()->reverse(); | |
| 2608 } | |
| 2609 | |
| 2610 int SystemDictionary::number_of_classes() { | |
| 2611 return dictionary()->number_of_entries(); | |
| 2612 } | |
| 2613 | |
| 2614 | |
| 2615 // ---------------------------------------------------------------------------- | |
|
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|
2616 void SystemDictionary::print_shared(bool details) { |
|
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|
2617 shared_dictionary()->print(details); |
|
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|
2618 } |
| 0 | 2619 |
|
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|
2620 void SystemDictionary::print(bool details) { |
|
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|
2621 dictionary()->print(details); |
| 0 | 2622 |
| 2623 // Placeholders | |
| 2624 GCMutexLocker mu(SystemDictionary_lock); | |
| 2625 placeholders()->print(); | |
| 2626 | |
| 2627 // loader constraints - print under SD_lock | |
| 2628 constraints()->print(); | |
| 2629 } | |
| 2630 | |
| 2631 | |
| 2632 void SystemDictionary::verify() { | |
| 2633 guarantee(dictionary() != NULL, "Verify of system dictionary failed"); | |
| 2634 guarantee(constraints() != NULL, | |
| 2635 "Verify of loader constraints failed"); | |
| 2636 guarantee(dictionary()->number_of_entries() >= 0 && | |
| 2637 placeholders()->number_of_entries() >= 0, | |
| 2638 "Verify of system dictionary failed"); | |
| 2639 | |
| 2640 // Verify dictionary | |
| 2641 dictionary()->verify(); | |
| 2642 | |
| 2643 GCMutexLocker mu(SystemDictionary_lock); | |
| 2644 placeholders()->verify(); | |
| 2645 | |
| 2646 // Verify constraint table | |
| 2647 guarantee(constraints() != NULL, "Verify of loader constraints failed"); | |
|
1258
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6920977: G1: guarantee(k == probe->klass(),"klass should be in dictionary") fails
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1142
diff
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|
2648 constraints()->verify(dictionary(), placeholders()); |
| 0 | 2649 } |
| 2650 | |
| 10405 | 2651 // utility function for class load event |
|
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86e6d691f2e1
8028128: Add a type safe alternative for working with counter based data
mgronlun
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12970
diff
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|
2652 void SystemDictionary::post_class_load_event(const Ticks& start_time, |
| 10405 | 2653 instanceKlassHandle k, |
| 2654 Handle initiating_loader) { | |
| 2655 #if INCLUDE_TRACE | |
| 2656 EventClassLoad event(UNTIMED); | |
| 2657 if (event.should_commit()) { | |
| 2658 event.set_starttime(start_time); | |
| 2659 event.set_loadedClass(k()); | |
| 2660 oop defining_class_loader = k->class_loader(); | |
| 2661 event.set_definingClassLoader(defining_class_loader != NULL ? | |
| 2662 defining_class_loader->klass() : (Klass*)NULL); | |
| 2663 oop class_loader = initiating_loader.is_null() ? (oop)NULL : initiating_loader(); | |
| 2664 event.set_initiatingClassLoader(class_loader != NULL ? | |
| 2665 class_loader->klass() : (Klass*)NULL); | |
| 2666 event.commit(); | |
| 2667 } | |
| 2668 #endif /* INCLUDE_TRACE */ | |
| 2669 } | |
| 2670 | |
| 0 | 2671 #ifndef PRODUCT |
| 2672 | |
| 2673 // statistics code | |
| 2674 class ClassStatistics: AllStatic { | |
| 2675 private: | |
| 2676 static int nclasses; // number of classes | |
| 2677 static int nmethods; // number of methods | |
| 2678 static int nmethoddata; // number of methodData | |
| 2679 static int class_size; // size of class objects in words | |
| 2680 static int method_size; // size of method objects in words | |
| 2681 static int debug_size; // size of debug info in methods | |
| 2682 static int methoddata_size; // size of methodData objects in words | |
| 2683 | |
|
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|
2684 static void do_class(Klass* k) { |
| 0 | 2685 nclasses++; |
| 2686 class_size += k->size(); | |
|
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|
2687 if (k->oop_is_instance()) { |
|
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diff
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|
2688 InstanceKlass* ik = (InstanceKlass*)k; |
| 0 | 2689 class_size += ik->methods()->size(); |
| 2690 class_size += ik->constants()->size(); | |
| 2691 class_size += ik->local_interfaces()->size(); | |
| 2692 class_size += ik->transitive_interfaces()->size(); | |
| 2693 // We do not have to count implementors, since we only store one! | |
|
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|
2694 // SSS: How should these be accounted now that they have moved? |
|
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|
2695 // class_size += ik->fields()->length(); |
| 0 | 2696 } |
| 2697 } | |
| 2698 | |
|
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|
2699 static void do_method(Method* m) { |
| 0 | 2700 nmethods++; |
| 2701 method_size += m->size(); | |
| 2702 // class loader uses same objArray for empty vectors, so don't count these | |
| 2703 if (m->has_stackmap_table()) { | |
| 2704 method_size += m->stackmap_data()->size(); | |
| 2705 } | |
| 2706 | |
|
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|
2707 MethodData* mdo = m->method_data(); |
| 0 | 2708 if (mdo != NULL) { |
| 2709 nmethoddata++; | |
| 2710 methoddata_size += mdo->size(); | |
| 2711 } | |
| 2712 } | |
| 2713 | |
| 2714 public: | |
| 2715 static void print() { | |
| 2716 SystemDictionary::classes_do(do_class); | |
| 2717 SystemDictionary::methods_do(do_method); | |
| 2718 tty->print_cr("Class statistics:"); | |
| 2719 tty->print_cr("%d classes (%d bytes)", nclasses, class_size * oopSize); | |
| 2720 tty->print_cr("%d methods (%d bytes = %d base + %d debug info)", nmethods, | |
| 2721 (method_size + debug_size) * oopSize, method_size * oopSize, debug_size * oopSize); | |
| 2722 tty->print_cr("%d methoddata (%d bytes)", nmethoddata, methoddata_size * oopSize); | |
| 2723 } | |
| 2724 }; | |
| 2725 | |
| 2726 | |
| 2727 int ClassStatistics::nclasses = 0; | |
| 2728 int ClassStatistics::nmethods = 0; | |
| 2729 int ClassStatistics::nmethoddata = 0; | |
| 2730 int ClassStatistics::class_size = 0; | |
| 2731 int ClassStatistics::method_size = 0; | |
| 2732 int ClassStatistics::debug_size = 0; | |
| 2733 int ClassStatistics::methoddata_size = 0; | |
| 2734 | |
| 2735 void SystemDictionary::print_class_statistics() { | |
| 2736 ResourceMark rm; | |
| 2737 ClassStatistics::print(); | |
| 2738 } | |
| 2739 | |
| 2740 | |
| 2741 class MethodStatistics: AllStatic { | |
| 2742 public: | |
| 2743 enum { | |
| 2744 max_parameter_size = 10 | |
| 2745 }; | |
| 2746 private: | |
| 2747 | |
| 2748 static int _number_of_methods; | |
| 2749 static int _number_of_final_methods; | |
| 2750 static int _number_of_static_methods; | |
| 2751 static int _number_of_native_methods; | |
| 2752 static int _number_of_synchronized_methods; | |
| 2753 static int _number_of_profiled_methods; | |
| 2754 static int _number_of_bytecodes; | |
| 2755 static int _parameter_size_profile[max_parameter_size]; | |
| 2756 static int _bytecodes_profile[Bytecodes::number_of_java_codes]; | |
| 2757 | |
| 2758 static void initialize() { | |
| 2759 _number_of_methods = 0; | |
| 2760 _number_of_final_methods = 0; | |
| 2761 _number_of_static_methods = 0; | |
| 2762 _number_of_native_methods = 0; | |
| 2763 _number_of_synchronized_methods = 0; | |
| 2764 _number_of_profiled_methods = 0; | |
| 2765 _number_of_bytecodes = 0; | |
| 2766 for (int i = 0; i < max_parameter_size ; i++) _parameter_size_profile[i] = 0; | |
| 2767 for (int j = 0; j < Bytecodes::number_of_java_codes; j++) _bytecodes_profile [j] = 0; | |
| 2768 }; | |
| 2769 | |
|
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|
2770 static void do_method(Method* m) { |
| 0 | 2771 _number_of_methods++; |
| 2772 // collect flag info | |
| 2773 if (m->is_final() ) _number_of_final_methods++; | |
| 2774 if (m->is_static() ) _number_of_static_methods++; | |
| 2775 if (m->is_native() ) _number_of_native_methods++; | |
| 2776 if (m->is_synchronized()) _number_of_synchronized_methods++; | |
| 2777 if (m->method_data() != NULL) _number_of_profiled_methods++; | |
| 2778 // collect parameter size info (add one for receiver, if any) | |
| 2779 _parameter_size_profile[MIN2(m->size_of_parameters() + (m->is_static() ? 0 : 1), max_parameter_size - 1)]++; | |
| 2780 // collect bytecodes info | |
| 2781 { | |
| 2782 Thread *thread = Thread::current(); | |
| 2783 HandleMark hm(thread); | |
| 2784 BytecodeStream s(methodHandle(thread, m)); | |
| 2785 Bytecodes::Code c; | |
| 2786 while ((c = s.next()) >= 0) { | |
| 2787 _number_of_bytecodes++; | |
| 2788 _bytecodes_profile[c]++; | |
| 2789 } | |
| 2790 } | |
| 2791 } | |
| 2792 | |
| 2793 public: | |
| 2794 static void print() { | |
| 2795 initialize(); | |
| 2796 SystemDictionary::methods_do(do_method); | |
| 2797 // generate output | |
| 2798 tty->cr(); | |
| 2799 tty->print_cr("Method statistics (static):"); | |
| 2800 // flag distribution | |
| 2801 tty->cr(); | |
| 2802 tty->print_cr("%6d final methods %6.1f%%", _number_of_final_methods , _number_of_final_methods * 100.0F / _number_of_methods); | |
| 2803 tty->print_cr("%6d static methods %6.1f%%", _number_of_static_methods , _number_of_static_methods * 100.0F / _number_of_methods); | |
| 2804 tty->print_cr("%6d native methods %6.1f%%", _number_of_native_methods , _number_of_native_methods * 100.0F / _number_of_methods); | |
| 2805 tty->print_cr("%6d synchronized methods %6.1f%%", _number_of_synchronized_methods, _number_of_synchronized_methods * 100.0F / _number_of_methods); | |
| 2806 tty->print_cr("%6d profiled methods %6.1f%%", _number_of_profiled_methods, _number_of_profiled_methods * 100.0F / _number_of_methods); | |
| 2807 // parameter size profile | |
| 2808 tty->cr(); | |
| 2809 { int tot = 0; | |
| 2810 int avg = 0; | |
| 2811 for (int i = 0; i < max_parameter_size; i++) { | |
| 2812 int n = _parameter_size_profile[i]; | |
| 2813 tot += n; | |
| 2814 avg += n*i; | |
| 2815 tty->print_cr("parameter size = %1d: %6d methods %5.1f%%", i, n, n * 100.0F / _number_of_methods); | |
| 2816 } | |
| 2817 assert(tot == _number_of_methods, "should be the same"); | |
| 2818 tty->print_cr(" %6d methods 100.0%%", _number_of_methods); | |
| 2819 tty->print_cr("(average parameter size = %3.1f including receiver, if any)", (float)avg / _number_of_methods); | |
| 2820 } | |
| 2821 // bytecodes profile | |
| 2822 tty->cr(); | |
| 2823 { int tot = 0; | |
| 2824 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) { | |
| 2825 if (Bytecodes::is_defined(i)) { | |
| 2826 Bytecodes::Code c = Bytecodes::cast(i); | |
| 2827 int n = _bytecodes_profile[c]; | |
| 2828 tot += n; | |
| 2829 tty->print_cr("%9d %7.3f%% %s", n, n * 100.0F / _number_of_bytecodes, Bytecodes::name(c)); | |
| 2830 } | |
| 2831 } | |
| 2832 assert(tot == _number_of_bytecodes, "should be the same"); | |
| 2833 tty->print_cr("%9d 100.000%%", _number_of_bytecodes); | |
| 2834 } | |
| 2835 tty->cr(); | |
| 2836 } | |
| 2837 }; | |
| 2838 | |
| 2839 int MethodStatistics::_number_of_methods; | |
| 2840 int MethodStatistics::_number_of_final_methods; | |
| 2841 int MethodStatistics::_number_of_static_methods; | |
| 2842 int MethodStatistics::_number_of_native_methods; | |
| 2843 int MethodStatistics::_number_of_synchronized_methods; | |
| 2844 int MethodStatistics::_number_of_profiled_methods; | |
| 2845 int MethodStatistics::_number_of_bytecodes; | |
| 2846 int MethodStatistics::_parameter_size_profile[MethodStatistics::max_parameter_size]; | |
| 2847 int MethodStatistics::_bytecodes_profile[Bytecodes::number_of_java_codes]; | |
| 2848 | |
| 2849 | |
| 2850 void SystemDictionary::print_method_statistics() { | |
| 2851 MethodStatistics::print(); | |
| 2852 } | |
| 2853 | |
| 2854 #endif // PRODUCT |