Mercurial > hg > truffle
annotate src/share/vm/classfile/systemDictionary.cpp @ 18083:1ff7622846cf
Added tag jdk8u25-b07 for changeset 520188d4bade
author | asaha |
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date | Mon, 14 Jul 2014 15:08:04 -0700 |
parents | ae92351815b6 |
children | 52b4284cb496 ce8f6bb717c9 01dcaba9b3f3 |
rev | line source |
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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" | |
33 #include "classfile/vmSymbols.hpp" | |
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34 #include "compiler/compileBroker.hpp" |
1972 | 35 #include "interpreter/bytecodeStream.hpp" |
36 #include "interpreter/interpreter.hpp" | |
37 #include "memory/gcLocker.hpp" | |
38 #include "memory/oopFactory.hpp" | |
39 #include "oops/instanceKlass.hpp" | |
40 #include "oops/instanceRefKlass.hpp" | |
41 #include "oops/klass.inline.hpp" | |
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42 #include "oops/methodData.hpp" |
1972 | 43 #include "oops/objArrayKlass.hpp" |
44 #include "oops/oop.inline.hpp" | |
45 #include "oops/oop.inline2.hpp" | |
46 #include "oops/typeArrayKlass.hpp" | |
47 #include "prims/jvmtiEnvBase.hpp" | |
48 #include "prims/methodHandles.hpp" | |
49 #include "runtime/biasedLocking.hpp" | |
50 #include "runtime/fieldType.hpp" | |
51 #include "runtime/handles.inline.hpp" | |
52 #include "runtime/java.hpp" | |
53 #include "runtime/javaCalls.hpp" | |
54 #include "runtime/mutexLocker.hpp" | |
55 #include "runtime/signature.hpp" | |
56 #include "services/classLoadingService.hpp" | |
57 #include "services/threadService.hpp" | |
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58 #include "utilities/macros.hpp" |
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59 #include "utilities/ticks.hpp" |
0 | 60 |
10405 | 61 #if INCLUDE_TRACE |
62 #include "trace/tracing.hpp" | |
63 #endif | |
64 | |
1903 | 65 Dictionary* SystemDictionary::_dictionary = NULL; |
66 PlaceholderTable* SystemDictionary::_placeholders = NULL; | |
67 Dictionary* SystemDictionary::_shared_dictionary = NULL; | |
68 LoaderConstraintTable* SystemDictionary::_loader_constraints = NULL; | |
69 ResolutionErrorTable* SystemDictionary::_resolution_errors = NULL; | |
70 SymbolPropertyTable* SystemDictionary::_invoke_method_table = NULL; | |
0 | 71 |
72 | |
73 int SystemDictionary::_number_of_modifications = 0; | |
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74 int SystemDictionary::_sdgeneration = 0; |
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75 const int SystemDictionary::_primelist[_prime_array_size] = {1009,2017,4049,5051,10103, |
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76 20201,40423,99991}; |
0 | 77 |
78 oop SystemDictionary::_system_loader_lock_obj = NULL; | |
79 | |
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80 Klass* SystemDictionary::_well_known_klasses[SystemDictionary::WKID_LIMIT] |
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81 = { NULL /*, NULL...*/ }; |
0 | 82 |
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83 Klass* SystemDictionary::_box_klasses[T_VOID+1] = { NULL /*, NULL...*/ }; |
0 | 84 |
85 oop SystemDictionary::_java_system_loader = NULL; | |
86 | |
87 bool SystemDictionary::_has_loadClassInternal = false; | |
88 bool SystemDictionary::_has_checkPackageAccess = false; | |
89 | |
90 // lazily initialized klass variables | |
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91 Klass* volatile SystemDictionary::_abstract_ownable_synchronizer_klass = NULL; |
0 | 92 |
93 | |
94 // ---------------------------------------------------------------------------- | |
95 // Java-level SystemLoader | |
96 | |
97 oop SystemDictionary::java_system_loader() { | |
98 return _java_system_loader; | |
99 } | |
100 | |
101 void SystemDictionary::compute_java_system_loader(TRAPS) { | |
1142 | 102 KlassHandle system_klass(THREAD, WK_KLASS(ClassLoader_klass)); |
0 | 103 JavaValue result(T_OBJECT); |
104 JavaCalls::call_static(&result, | |
1142 | 105 KlassHandle(THREAD, WK_KLASS(ClassLoader_klass)), |
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106 vmSymbols::getSystemClassLoader_name(), |
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107 vmSymbols::void_classloader_signature(), |
0 | 108 CHECK); |
109 | |
110 _java_system_loader = (oop)result.get_jobject(); | |
111 } | |
112 | |
113 | |
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114 ClassLoaderData* SystemDictionary::register_loader(Handle class_loader, TRAPS) { |
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115 if (class_loader() == NULL) return ClassLoaderData::the_null_class_loader_data(); |
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116 return ClassLoaderDataGraph::find_or_create(class_loader, CHECK_NULL); |
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117 } |
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118 |
0 | 119 // ---------------------------------------------------------------------------- |
120 // debugging | |
121 | |
122 #ifdef ASSERT | |
123 | |
124 // return true if class_name contains no '.' (internal format is '/') | |
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125 bool SystemDictionary::is_internal_format(Symbol* class_name) { |
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126 if (class_name != NULL) { |
0 | 127 ResourceMark rm; |
128 char* name = class_name->as_C_string(); | |
129 return strchr(name, '.') == NULL; | |
130 } else { | |
131 return true; | |
132 } | |
133 } | |
134 | |
135 #endif | |
136 | |
137 // ---------------------------------------------------------------------------- | |
514 | 138 // Parallel class loading check |
139 | |
140 bool SystemDictionary::is_parallelCapable(Handle class_loader) { | |
141 if (UnsyncloadClass || class_loader.is_null()) return true; | |
142 if (AlwaysLockClassLoader) return false; | |
3938 | 143 return java_lang_ClassLoader::parallelCapable(class_loader()); |
514 | 144 } |
145 // ---------------------------------------------------------------------------- | |
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146 // ParallelDefineClass flag does not apply to bootclass loader |
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147 bool SystemDictionary::is_parallelDefine(Handle class_loader) { |
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148 if (class_loader.is_null()) return false; |
3938 | 149 if (AllowParallelDefineClass && java_lang_ClassLoader::parallelCapable(class_loader())) { |
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150 return true; |
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151 } |
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152 return false; |
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153 } |
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154 |
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155 /** |
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156 * Returns true if the passed class loader is the extension class loader. |
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157 */ |
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158 bool SystemDictionary::is_ext_class_loader(Handle class_loader) { |
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159 if (class_loader.is_null()) { |
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160 return false; |
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161 } |
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162 return (class_loader->klass()->name() == vmSymbols::sun_misc_Launcher_ExtClassLoader()); |
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163 } |
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164 |
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165 // ---------------------------------------------------------------------------- |
0 | 166 // Resolving of classes |
167 | |
168 // Forwards to resolve_or_null | |
169 | |
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170 Klass* SystemDictionary::resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS) { |
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171 Klass* klass = resolve_or_null(class_name, class_loader, protection_domain, THREAD); |
0 | 172 if (HAS_PENDING_EXCEPTION || klass == NULL) { |
173 KlassHandle k_h(THREAD, klass); | |
174 // can return a null klass | |
175 klass = handle_resolution_exception(class_name, class_loader, protection_domain, throw_error, k_h, THREAD); | |
176 } | |
177 return klass; | |
178 } | |
179 | |
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180 Klass* SystemDictionary::handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS) { |
0 | 181 if (HAS_PENDING_EXCEPTION) { |
182 // If we have a pending exception we forward it to the caller, unless throw_error is true, | |
183 // in which case we have to check whether the pending exception is a ClassNotFoundException, | |
184 // and if so convert it to a NoClassDefFoundError | |
185 // And chain the original ClassNotFoundException | |
1142 | 186 if (throw_error && PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass())) { |
0 | 187 ResourceMark rm(THREAD); |
188 assert(klass_h() == NULL, "Should not have result with exception pending"); | |
189 Handle e(THREAD, PENDING_EXCEPTION); | |
190 CLEAR_PENDING_EXCEPTION; | |
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191 THROW_MSG_CAUSE_NULL(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string(), e); |
0 | 192 } else { |
193 return NULL; | |
194 } | |
195 } | |
196 // Class not found, throw appropriate error or exception depending on value of throw_error | |
197 if (klass_h() == NULL) { | |
198 ResourceMark rm(THREAD); | |
199 if (throw_error) { | |
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200 THROW_MSG_NULL(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string()); |
0 | 201 } else { |
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202 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), class_name->as_C_string()); |
0 | 203 } |
204 } | |
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205 return (Klass*)klass_h(); |
0 | 206 } |
207 | |
208 | |
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209 Klass* SystemDictionary::resolve_or_fail(Symbol* class_name, |
0 | 210 bool throw_error, TRAPS) |
211 { | |
212 return resolve_or_fail(class_name, Handle(), Handle(), throw_error, THREAD); | |
213 } | |
214 | |
215 | |
216 // Forwards to resolve_instance_class_or_null | |
217 | |
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218 Klass* SystemDictionary::resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS) { |
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219 assert(!THREAD->is_Compiler_thread(), |
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220 err_msg("can not load classes with compiler thread: class=%s, classloader=%s", |
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221 class_name->as_C_string(), |
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222 class_loader.is_null() ? "null" : class_loader->klass()->name()->as_C_string())); |
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223 if (FieldType::is_array(class_name)) { |
0 | 224 return resolve_array_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); |
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225 } else if (FieldType::is_obj(class_name)) { |
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226 ResourceMark rm(THREAD); |
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227 // Ignore wrapping L and ;. |
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228 TempNewSymbol name = SymbolTable::new_symbol(class_name->as_C_string() + 1, |
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229 class_name->utf8_length() - 2, CHECK_NULL); |
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230 return resolve_instance_class_or_null(name, class_loader, protection_domain, CHECK_NULL); |
0 | 231 } else { |
232 return resolve_instance_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); | |
233 } | |
234 } | |
235 | |
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236 Klass* SystemDictionary::resolve_or_null(Symbol* class_name, TRAPS) { |
0 | 237 return resolve_or_null(class_name, Handle(), Handle(), THREAD); |
238 } | |
239 | |
240 // Forwards to resolve_instance_class_or_null | |
241 | |
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242 Klass* SystemDictionary::resolve_array_class_or_null(Symbol* class_name, |
0 | 243 Handle class_loader, |
244 Handle protection_domain, | |
245 TRAPS) { | |
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246 assert(FieldType::is_array(class_name), "must be array"); |
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247 Klass* k = NULL; |
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248 FieldArrayInfo fd; |
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249 // dimension and object_key in FieldArrayInfo are assigned as a side-effect |
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250 // of this call |
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251 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_NULL); |
0 | 252 if (t == T_OBJECT) { |
253 // naked oop "k" is OK here -- we assign back into it | |
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254 k = SystemDictionary::resolve_instance_class_or_null(fd.object_key(), |
0 | 255 class_loader, |
256 protection_domain, | |
257 CHECK_NULL); | |
258 if (k != NULL) { | |
6983 | 259 k = k->array_klass(fd.dimension(), CHECK_NULL); |
0 | 260 } |
261 } else { | |
262 k = Universe::typeArrayKlassObj(t); | |
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263 k = TypeArrayKlass::cast(k)->array_klass(fd.dimension(), CHECK_NULL); |
0 | 264 } |
265 return k; | |
266 } | |
267 | |
268 | |
269 // Must be called for any super-class or super-interface resolution | |
270 // during class definition to allow class circularity checking | |
271 // super-interface callers: | |
272 // parse_interfaces - for defineClass & jvmtiRedefineClasses | |
273 // super-class callers: | |
274 // ClassFileParser - for defineClass & jvmtiRedefineClasses | |
275 // load_shared_class - while loading a class from shared archive | |
514 | 276 // resolve_instance_class_or_null: |
277 // via: handle_parallel_super_load | |
0 | 278 // when resolving a class that has an existing placeholder with |
279 // a saved superclass [i.e. a defineClass is currently in progress] | |
280 // if another thread is trying to resolve the class, it must do | |
281 // super-class checks on its own thread to catch class circularity | |
282 // This last call is critical in class circularity checking for cases | |
283 // where classloading is delegated to different threads and the | |
284 // classloader lock is released. | |
285 // Take the case: Base->Super->Base | |
286 // 1. If thread T1 tries to do a defineClass of class Base | |
287 // resolve_super_or_fail creates placeholder: T1, Base (super Super) | |
288 // 2. resolve_instance_class_or_null does not find SD or placeholder for Super | |
289 // so it tries to load Super | |
290 // 3. If we load the class internally, or user classloader uses same thread | |
291 // loadClassFromxxx or defineClass via parseClassFile Super ... | |
292 // 3.1 resolve_super_or_fail creates placeholder: T1, Super (super Base) | |
293 // 3.3 resolve_instance_class_or_null Base, finds placeholder for Base | |
294 // 3.4 calls resolve_super_or_fail Base | |
295 // 3.5 finds T1,Base -> throws class circularity | |
296 //OR 4. If T2 tries to resolve Super via defineClass Super ... | |
297 // 4.1 resolve_super_or_fail creates placeholder: T2, Super (super Base) | |
298 // 4.2 resolve_instance_class_or_null Base, finds placeholder for Base (super Super) | |
299 // 4.3 calls resolve_super_or_fail Super in parallel on own thread T2 | |
300 // 4.4 finds T2, Super -> throws class circularity | |
301 // Must be called, even if superclass is null, since this is | |
302 // where the placeholder entry is created which claims this | |
303 // thread is loading this class/classloader. | |
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304 Klass* SystemDictionary::resolve_super_or_fail(Symbol* child_name, |
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305 Symbol* class_name, |
0 | 306 Handle class_loader, |
307 Handle protection_domain, | |
308 bool is_superclass, | |
309 TRAPS) { | |
310 // Double-check, if child class is already loaded, just return super-class,interface | |
311 // Don't add a placedholder if already loaded, i.e. already in system dictionary | |
312 // Make sure there's a placeholder for the *child* before resolving. | |
313 // Used as a claim that this thread is currently loading superclass/classloader | |
314 // Used here for ClassCircularity checks and also for heap verification | |
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315 // (every InstanceKlass in the heap needs to be in the system dictionary |
0 | 316 // or have a placeholder). |
317 // Must check ClassCircularity before checking if super class is already loaded | |
318 // | |
319 // We might not already have a placeholder if this child_name was | |
320 // first seen via resolve_from_stream (jni_DefineClass or JVM_DefineClass); | |
321 // the name of the class might not be known until the stream is actually | |
322 // parsed. | |
323 // Bugs 4643874, 4715493 | |
324 // compute_hash can have a safepoint | |
325 | |
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326 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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327 unsigned int d_hash = dictionary()->compute_hash(child_name, loader_data); |
0 | 328 int d_index = dictionary()->hash_to_index(d_hash); |
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329 unsigned int p_hash = placeholders()->compute_hash(child_name, loader_data); |
0 | 330 int p_index = placeholders()->hash_to_index(p_hash); |
331 // can't throw error holding a lock | |
332 bool child_already_loaded = false; | |
333 bool throw_circularity_error = false; | |
334 { | |
335 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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336 Klass* childk = find_class(d_index, d_hash, child_name, loader_data); |
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337 Klass* quicksuperk; |
0 | 338 // to support // loading: if child done loading, just return superclass |
339 // if class_name, & class_loader don't match: | |
340 // if initial define, SD update will give LinkageError | |
341 // if redefine: compare_class_versions will give HIERARCHY_CHANGED | |
342 // so we don't throw an exception here. | |
343 // see: nsk redefclass014 & java.lang.instrument Instrument032 | |
344 if ((childk != NULL ) && (is_superclass) && | |
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345 ((quicksuperk = InstanceKlass::cast(childk)->super()) != NULL) && |
0 | 346 |
6983 | 347 ((quicksuperk->name() == class_name) && |
348 (quicksuperk->class_loader() == class_loader()))) { | |
0 | 349 return quicksuperk; |
350 } else { | |
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351 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, loader_data); |
0 | 352 if (probe && probe->check_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER)) { |
353 throw_circularity_error = true; | |
354 } | |
514 | 355 } |
356 if (!throw_circularity_error) { | |
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357 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, child_name, loader_data, PlaceholderTable::LOAD_SUPER, class_name, THREAD); |
0 | 358 } |
359 } | |
360 if (throw_circularity_error) { | |
361 ResourceMark rm(THREAD); | |
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362 THROW_MSG_NULL(vmSymbols::java_lang_ClassCircularityError(), child_name->as_C_string()); |
0 | 363 } |
364 | |
365 // java.lang.Object should have been found above | |
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366 assert(class_name != NULL, "null super class for resolving"); |
0 | 367 // Resolve the super class or interface, check results on return |
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368 Klass* superk = SystemDictionary::resolve_or_null(class_name, |
0 | 369 class_loader, |
370 protection_domain, | |
371 THREAD); | |
372 | |
373 KlassHandle superk_h(THREAD, superk); | |
374 | |
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375 // Clean up of placeholders moved so that each classloadAction registrar self-cleans up |
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376 // It is no longer necessary to keep the placeholder table alive until update_dictionary |
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377 // or error. GC used to walk the placeholder table as strong roots. |
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378 // The instanceKlass is kept alive because the class loader is on the stack, |
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379 // which keeps the loader_data alive, as well as all instanceKlasses in |
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380 // the loader_data. parseClassFile adds the instanceKlass to loader_data. |
0 | 381 { |
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382 MutexLocker mu(SystemDictionary_lock, THREAD); |
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383 placeholders()->find_and_remove(p_index, p_hash, child_name, loader_data, PlaceholderTable::LOAD_SUPER, THREAD); |
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384 SystemDictionary_lock->notify_all(); |
0 | 385 } |
386 if (HAS_PENDING_EXCEPTION || superk_h() == NULL) { | |
387 // can null superk | |
388 superk_h = KlassHandle(THREAD, handle_resolution_exception(class_name, class_loader, protection_domain, true, superk_h, THREAD)); | |
389 } | |
390 | |
391 return superk_h(); | |
392 } | |
393 | |
394 void SystemDictionary::validate_protection_domain(instanceKlassHandle klass, | |
395 Handle class_loader, | |
396 Handle protection_domain, | |
397 TRAPS) { | |
398 if(!has_checkPackageAccess()) return; | |
399 | |
400 // Now we have to call back to java to check if the initating class has access | |
401 JavaValue result(T_VOID); | |
402 if (TraceProtectionDomainVerification) { | |
403 // Print out trace information | |
404 tty->print_cr("Checking package access"); | |
405 tty->print(" - class loader: "); class_loader()->print_value_on(tty); tty->cr(); | |
406 tty->print(" - protection domain: "); protection_domain()->print_value_on(tty); tty->cr(); | |
407 tty->print(" - loading: "); klass()->print_value_on(tty); tty->cr(); | |
408 } | |
409 | |
1142 | 410 KlassHandle system_loader(THREAD, SystemDictionary::ClassLoader_klass()); |
0 | 411 JavaCalls::call_special(&result, |
412 class_loader, | |
413 system_loader, | |
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414 vmSymbols::checkPackageAccess_name(), |
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415 vmSymbols::class_protectiondomain_signature(), |
0 | 416 Handle(THREAD, klass->java_mirror()), |
417 protection_domain, | |
418 THREAD); | |
419 | |
420 if (TraceProtectionDomainVerification) { | |
421 if (HAS_PENDING_EXCEPTION) { | |
422 tty->print_cr(" -> DENIED !!!!!!!!!!!!!!!!!!!!!"); | |
423 } else { | |
424 tty->print_cr(" -> granted"); | |
425 } | |
426 tty->cr(); | |
427 } | |
428 | |
429 if (HAS_PENDING_EXCEPTION) return; | |
430 | |
431 // If no exception has been thrown, we have validated the protection domain | |
432 // Insert the protection domain of the initiating class into the set. | |
433 { | |
434 // We recalculate the entry here -- we've called out to java since | |
435 // the last time it was calculated. | |
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436 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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437 |
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438 Symbol* kn = klass->name(); |
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439 unsigned int d_hash = dictionary()->compute_hash(kn, loader_data); |
0 | 440 int d_index = dictionary()->hash_to_index(d_hash); |
441 | |
442 MutexLocker mu(SystemDictionary_lock, THREAD); | |
443 { | |
444 // Note that we have an entry, and entries can be deleted only during GC, | |
445 // so we cannot allow GC to occur while we're holding this entry. | |
446 | |
447 // We're using a No_Safepoint_Verifier to catch any place where we | |
448 // might potentially do a GC at all. | |
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449 // Dictionary::do_unloading() asserts that classes in SD are only |
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450 // unloaded at a safepoint. Anonymous classes are not in SD. |
0 | 451 No_Safepoint_Verifier nosafepoint; |
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452 dictionary()->add_protection_domain(d_index, d_hash, klass, loader_data, |
0 | 453 protection_domain, THREAD); |
454 } | |
455 } | |
456 } | |
457 | |
458 // We only get here if this thread finds that another thread | |
459 // has already claimed the placeholder token for the current operation, | |
460 // but that other thread either never owned or gave up the | |
461 // object lock | |
462 // Waits on SystemDictionary_lock to indicate placeholder table updated | |
463 // On return, caller must recheck placeholder table state | |
464 // | |
465 // We only get here if | |
466 // 1) custom classLoader, i.e. not bootstrap classloader | |
467 // 2) UnsyncloadClass not set | |
468 // 3) custom classLoader has broken the class loader objectLock | |
469 // so another thread got here in parallel | |
470 // | |
471 // lockObject must be held. | |
472 // Complicated dance due to lock ordering: | |
473 // Must first release the classloader object lock to | |
474 // allow initial definer to complete the class definition | |
475 // and to avoid deadlock | |
476 // Reclaim classloader lock object with same original recursion count | |
477 // Must release SystemDictionary_lock after notify, since | |
478 // class loader lock must be claimed before SystemDictionary_lock | |
479 // to prevent deadlocks | |
480 // | |
481 // The notify allows applications that did an untimed wait() on | |
482 // the classloader object lock to not hang. | |
483 void SystemDictionary::double_lock_wait(Handle lockObject, TRAPS) { | |
484 assert_lock_strong(SystemDictionary_lock); | |
485 | |
486 bool calledholdinglock | |
487 = ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, lockObject); | |
488 assert(calledholdinglock,"must hold lock for notify"); | |
514 | 489 assert((!(lockObject() == _system_loader_lock_obj) && !is_parallelCapable(lockObject)), "unexpected double_lock_wait"); |
0 | 490 ObjectSynchronizer::notifyall(lockObject, THREAD); |
491 intptr_t recursions = ObjectSynchronizer::complete_exit(lockObject, THREAD); | |
492 SystemDictionary_lock->wait(); | |
493 SystemDictionary_lock->unlock(); | |
494 ObjectSynchronizer::reenter(lockObject, recursions, THREAD); | |
495 SystemDictionary_lock->lock(); | |
496 } | |
497 | |
498 // If the class in is in the placeholder table, class loading is in progress | |
499 // For cases where the application changes threads to load classes, it | |
500 // is critical to ClassCircularity detection that we try loading | |
501 // the superclass on the same thread internally, so we do parallel | |
502 // super class loading here. | |
503 // This also is critical in cases where the original thread gets stalled | |
504 // even in non-circularity situations. | |
505 // Note: must call resolve_super_or_fail even if null super - | |
514 | 506 // to force placeholder entry creation for this class for circularity detection |
0 | 507 // Caller must check for pending exception |
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508 // Returns non-null Klass* if other thread has completed load |
0 | 509 // and we are done, |
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510 // If return null Klass* and no pending exception, the caller must load the class |
0 | 511 instanceKlassHandle SystemDictionary::handle_parallel_super_load( |
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512 Symbol* name, Symbol* superclassname, Handle class_loader, |
0 | 513 Handle protection_domain, Handle lockObject, TRAPS) { |
514 | |
515 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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516 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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517 unsigned int d_hash = dictionary()->compute_hash(name, loader_data); |
0 | 518 int d_index = dictionary()->hash_to_index(d_hash); |
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519 unsigned int p_hash = placeholders()->compute_hash(name, loader_data); |
0 | 520 int p_index = placeholders()->hash_to_index(p_hash); |
521 | |
522 // superk is not used, resolve_super called for circularity check only | |
523 // This code is reached in two situations. One if this thread | |
524 // is loading the same class twice (e.g. ClassCircularity, or | |
525 // java.lang.instrument). | |
526 // The second is if another thread started the resolve_super first | |
527 // and has not yet finished. | |
528 // In both cases the original caller will clean up the placeholder | |
529 // entry on error. | |
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530 Klass* superk = SystemDictionary::resolve_super_or_fail(name, |
0 | 531 superclassname, |
532 class_loader, | |
533 protection_domain, | |
534 true, | |
535 CHECK_(nh)); | |
536 | |
514 | 537 // parallelCapable class loaders do NOT wait for parallel superclass loads to complete |
538 // Serial class loaders and bootstrap classloader do wait for superclass loads | |
539 if (!class_loader.is_null() && is_parallelCapable(class_loader)) { | |
0 | 540 MutexLocker mu(SystemDictionary_lock, THREAD); |
541 // Check if classloading completed while we were loading superclass or waiting | |
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542 Klass* check = find_class(d_index, d_hash, name, loader_data); |
0 | 543 if (check != NULL) { |
544 // Klass is already loaded, so just return it | |
545 return(instanceKlassHandle(THREAD, check)); | |
546 } else { | |
547 return nh; | |
548 } | |
549 } | |
550 | |
551 // must loop to both handle other placeholder updates | |
552 // and spurious notifications | |
553 bool super_load_in_progress = true; | |
554 PlaceholderEntry* placeholder; | |
555 while (super_load_in_progress) { | |
556 MutexLocker mu(SystemDictionary_lock, THREAD); | |
557 // Check if classloading completed while we were loading superclass or waiting | |
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558 Klass* check = find_class(d_index, d_hash, name, loader_data); |
0 | 559 if (check != NULL) { |
560 // Klass is already loaded, so just return it | |
561 return(instanceKlassHandle(THREAD, check)); | |
562 } else { | |
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563 placeholder = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
0 | 564 if (placeholder && placeholder->super_load_in_progress() ){ |
565 // Before UnsyncloadClass: | |
566 // We only get here if the application has released the | |
567 // classloader lock when another thread was in the middle of loading a | |
568 // superclass/superinterface for this class, and now | |
569 // this thread is also trying to load this class. | |
570 // To minimize surprises, the first thread that started to | |
571 // load a class should be the one to complete the loading | |
572 // with the classfile it initially expected. | |
573 // This logic has the current thread wait once it has done | |
574 // all the superclass/superinterface loading it can, until | |
575 // the original thread completes the class loading or fails | |
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576 // If it completes we will use the resulting InstanceKlass |
0 | 577 // which we will find below in the systemDictionary. |
578 // We also get here for parallel bootstrap classloader | |
579 if (class_loader.is_null()) { | |
580 SystemDictionary_lock->wait(); | |
581 } else { | |
582 double_lock_wait(lockObject, THREAD); | |
583 } | |
584 } else { | |
585 // If not in SD and not in PH, other thread's load must have failed | |
586 super_load_in_progress = false; | |
587 } | |
588 } | |
589 } | |
590 return (nh); | |
591 } | |
592 | |
593 | |
10405 | 594 Klass* SystemDictionary::resolve_instance_class_or_null(Symbol* name, |
595 Handle class_loader, | |
596 Handle protection_domain, | |
597 TRAPS) { | |
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598 assert(name != NULL && !FieldType::is_array(name) && |
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599 !FieldType::is_obj(name), "invalid class name"); |
0 | 600 |
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601 Ticks class_load_start_time = Ticks::now(); |
10405 | 602 |
0 | 603 // UseNewReflection |
604 // Fix for 4474172; see evaluation for more details | |
605 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); | |
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606 ClassLoaderData *loader_data = register_loader(class_loader, CHECK_NULL); |
0 | 607 |
608 // Do lookup to see if class already exist and the protection domain | |
609 // has the right access | |
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610 // This call uses find which checks protection domain already matches |
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611 // All subsequent calls use find_class, and set has_loaded_class so that |
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612 // before we return a result we call out to java to check for valid protection domain |
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613 // to allow returning the Klass* and add it to the pd_set if it is valid |
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614 unsigned int d_hash = dictionary()->compute_hash(name, loader_data); |
0 | 615 int d_index = dictionary()->hash_to_index(d_hash); |
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616 Klass* probe = dictionary()->find(d_index, d_hash, name, loader_data, |
0 | 617 protection_domain, THREAD); |
618 if (probe != NULL) return probe; | |
619 | |
620 | |
621 // Non-bootstrap class loaders will call out to class loader and | |
622 // define via jvm/jni_DefineClass which will acquire the | |
623 // class loader object lock to protect against multiple threads | |
624 // defining the class in parallel by accident. | |
625 // This lock must be acquired here so the waiter will find | |
626 // any successful result in the SystemDictionary and not attempt | |
627 // the define | |
514 | 628 // ParallelCapable Classloaders and the bootstrap classloader, |
0 | 629 // or all classloaders with UnsyncloadClass do not acquire lock here |
630 bool DoObjectLock = true; | |
514 | 631 if (is_parallelCapable(class_loader)) { |
0 | 632 DoObjectLock = false; |
633 } | |
634 | |
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635 unsigned int p_hash = placeholders()->compute_hash(name, loader_data); |
0 | 636 int p_index = placeholders()->hash_to_index(p_hash); |
637 | |
638 // Class is not in SystemDictionary so we have to do loading. | |
639 // Make sure we are synchronized on the class loader before we proceed | |
640 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
641 check_loader_lock_contention(lockObject, THREAD); | |
642 ObjectLocker ol(lockObject, THREAD, DoObjectLock); | |
643 | |
644 // Check again (after locking) if class already exist in SystemDictionary | |
645 bool class_has_been_loaded = false; | |
646 bool super_load_in_progress = false; | |
647 bool havesupername = false; | |
648 instanceKlassHandle k; | |
649 PlaceholderEntry* placeholder; | |
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650 Symbol* superclassname = NULL; |
0 | 651 |
652 { | |
653 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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654 Klass* check = find_class(d_index, d_hash, name, loader_data); |
0 | 655 if (check != NULL) { |
656 // Klass is already loaded, so just return it | |
657 class_has_been_loaded = true; | |
658 k = instanceKlassHandle(THREAD, check); | |
659 } else { | |
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660 placeholder = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
0 | 661 if (placeholder && placeholder->super_load_in_progress()) { |
662 super_load_in_progress = true; | |
663 if (placeholder->havesupername() == true) { | |
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664 superclassname = placeholder->supername(); |
0 | 665 havesupername = true; |
666 } | |
667 } | |
668 } | |
669 } | |
670 | |
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671 // If the class is in the placeholder table, class loading is in progress |
0 | 672 if (super_load_in_progress && havesupername==true) { |
673 k = SystemDictionary::handle_parallel_super_load(name, superclassname, | |
674 class_loader, protection_domain, lockObject, THREAD); | |
675 if (HAS_PENDING_EXCEPTION) { | |
676 return NULL; | |
677 } | |
678 if (!k.is_null()) { | |
679 class_has_been_loaded = true; | |
680 } | |
681 } | |
682 | |
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683 bool throw_circularity_error = false; |
0 | 684 if (!class_has_been_loaded) { |
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685 bool load_instance_added = false; |
0 | 686 |
687 // add placeholder entry to record loading instance class | |
688 // Five cases: | |
689 // All cases need to prevent modifying bootclasssearchpath | |
690 // in parallel with a classload of same classname | |
514 | 691 // Redefineclasses uses existence of the placeholder for the duration |
692 // of the class load to prevent concurrent redefinition of not completely | |
693 // defined classes. | |
0 | 694 // case 1. traditional classloaders that rely on the classloader object lock |
695 // - no other need for LOAD_INSTANCE | |
696 // case 2. traditional classloaders that break the classloader object lock | |
697 // as a deadlock workaround. Detection of this case requires that | |
698 // this check is done while holding the classloader object lock, | |
699 // and that lock is still held when calling classloader's loadClass. | |
700 // For these classloaders, we ensure that the first requestor | |
701 // completes the load and other requestors wait for completion. | |
702 // case 3. UnsyncloadClass - don't use objectLocker | |
703 // With this flag, we allow parallel classloading of a | |
704 // class/classloader pair | |
705 // case4. Bootstrap classloader - don't own objectLocker | |
706 // This classloader supports parallelism at the classloader level, | |
707 // but only allows a single load of a class/classloader pair. | |
708 // No performance benefit and no deadlock issues. | |
514 | 709 // case 5. parallelCapable user level classloaders - without objectLocker |
710 // Allow parallel classloading of a class/classloader pair | |
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711 |
0 | 712 { |
713 MutexLocker mu(SystemDictionary_lock, THREAD); | |
514 | 714 if (class_loader.is_null() || !is_parallelCapable(class_loader)) { |
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715 PlaceholderEntry* oldprobe = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
0 | 716 if (oldprobe) { |
717 // only need check_seen_thread once, not on each loop | |
718 // 6341374 java/lang/Instrument with -Xcomp | |
719 if (oldprobe->check_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE)) { | |
720 throw_circularity_error = true; | |
721 } else { | |
722 // case 1: traditional: should never see load_in_progress. | |
723 while (!class_has_been_loaded && oldprobe && oldprobe->instance_load_in_progress()) { | |
724 | |
725 // case 4: bootstrap classloader: prevent futile classloading, | |
726 // wait on first requestor | |
727 if (class_loader.is_null()) { | |
728 SystemDictionary_lock->wait(); | |
729 } else { | |
730 // case 2: traditional with broken classloader lock. wait on first | |
731 // requestor. | |
732 double_lock_wait(lockObject, THREAD); | |
733 } | |
734 // Check if classloading completed while we were waiting | |
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735 Klass* check = find_class(d_index, d_hash, name, loader_data); |
0 | 736 if (check != NULL) { |
737 // Klass is already loaded, so just return it | |
738 k = instanceKlassHandle(THREAD, check); | |
739 class_has_been_loaded = true; | |
740 } | |
741 // check if other thread failed to load and cleaned up | |
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742 oldprobe = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
0 | 743 } |
744 } | |
745 } | |
746 } | |
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747 // All cases: add LOAD_INSTANCE holding SystemDictionary_lock |
514 | 748 // case 3: UnsyncloadClass || case 5: parallelCapable: allow competing threads to try |
0 | 749 // LOAD_INSTANCE in parallel |
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750 |
514 | 751 if (!throw_circularity_error && !class_has_been_loaded) { |
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752 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, name, loader_data, PlaceholderTable::LOAD_INSTANCE, NULL, THREAD); |
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753 load_instance_added = true; |
0 | 754 // For class loaders that do not acquire the classloader object lock, |
755 // if they did not catch another thread holding LOAD_INSTANCE, | |
756 // need a check analogous to the acquire ObjectLocker/find_class | |
757 // i.e. now that we hold the LOAD_INSTANCE token on loading this class/CL | |
758 // one final check if the load has already completed | |
514 | 759 // class loaders holding the ObjectLock shouldn't find the class here |
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760 Klass* check = find_class(d_index, d_hash, name, loader_data); |
0 | 761 if (check != NULL) { |
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762 // Klass is already loaded, so return it after checking/adding protection domain |
0 | 763 k = instanceKlassHandle(THREAD, check); |
764 class_has_been_loaded = true; | |
765 } | |
766 } | |
767 } | |
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768 |
0 | 769 // must throw error outside of owning lock |
770 if (throw_circularity_error) { | |
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771 assert(!HAS_PENDING_EXCEPTION && load_instance_added == false,"circularity error cleanup"); |
0 | 772 ResourceMark rm(THREAD); |
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773 THROW_MSG_NULL(vmSymbols::java_lang_ClassCircularityError(), name->as_C_string()); |
0 | 774 } |
775 | |
776 if (!class_has_been_loaded) { | |
777 | |
778 // Do actual loading | |
779 k = load_instance_class(name, class_loader, THREAD); | |
780 | |
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781 // For UnsyncloadClass only |
0 | 782 // If they got a linkageError, check if a parallel class load succeeded. |
783 // If it did, then for bytecode resolution the specification requires | |
784 // that we return the same result we did for the other thread, i.e. the | |
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785 // successfully loaded InstanceKlass |
0 | 786 // Should not get here for classloaders that support parallelism |
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787 // with the new cleaner mechanism, even with AllowParallelDefineClass |
514 | 788 // Bootstrap goes through here to allow for an extra guarantee check |
0 | 789 if (UnsyncloadClass || (class_loader.is_null())) { |
790 if (k.is_null() && HAS_PENDING_EXCEPTION | |
1142 | 791 && PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { |
0 | 792 MutexLocker mu(SystemDictionary_lock, THREAD); |
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793 Klass* check = find_class(d_index, d_hash, name, loader_data); |
0 | 794 if (check != NULL) { |
795 // Klass is already loaded, so just use it | |
796 k = instanceKlassHandle(THREAD, check); | |
797 CLEAR_PENDING_EXCEPTION; | |
798 guarantee((!class_loader.is_null()), "dup definition for bootstrap loader?"); | |
799 } | |
800 } | |
801 } | |
802 | |
803 // If everything was OK (no exceptions, no null return value), and | |
804 // class_loader is NOT the defining loader, do a little more bookkeeping. | |
805 if (!HAS_PENDING_EXCEPTION && !k.is_null() && | |
806 k->class_loader() != class_loader()) { | |
807 | |
808 check_constraints(d_index, d_hash, k, class_loader, false, THREAD); | |
809 | |
810 // Need to check for a PENDING_EXCEPTION again; check_constraints | |
811 // can throw and doesn't use the CHECK macro. | |
812 if (!HAS_PENDING_EXCEPTION) { | |
813 { // Grabbing the Compile_lock prevents systemDictionary updates | |
814 // during compilations. | |
815 MutexLocker mu(Compile_lock, THREAD); | |
816 update_dictionary(d_index, d_hash, p_index, p_hash, | |
10405 | 817 k, class_loader, THREAD); |
0 | 818 } |
10405 | 819 |
0 | 820 if (JvmtiExport::should_post_class_load()) { |
821 Thread *thread = THREAD; | |
822 assert(thread->is_Java_thread(), "thread->is_Java_thread()"); | |
823 JvmtiExport::post_class_load((JavaThread *) thread, k()); | |
824 } | |
825 } | |
826 } | |
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827 } // load_instance_class loop |
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828 |
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829 if (load_instance_added == true) { |
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830 // clean up placeholder entries for LOAD_INSTANCE success or error |
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831 // This brackets the SystemDictionary updates for both defining |
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832 // and initiating loaders |
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833 MutexLocker mu(SystemDictionary_lock, THREAD); |
10405 | 834 placeholders()->find_and_remove(p_index, p_hash, name, loader_data, PlaceholderTable::LOAD_INSTANCE, THREAD); |
835 SystemDictionary_lock->notify_all(); | |
0 | 836 } |
837 } | |
838 | |
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839 if (HAS_PENDING_EXCEPTION || k.is_null()) { |
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840 return NULL; |
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841 } |
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842 |
10405 | 843 post_class_load_event(class_load_start_time, k, class_loader); |
844 | |
0 | 845 #ifdef ASSERT |
846 { | |
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847 ClassLoaderData* loader_data = k->class_loader_data(); |
0 | 848 MutexLocker mu(SystemDictionary_lock, THREAD); |
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849 Klass* kk = find_class(name, loader_data); |
0 | 850 assert(kk == k(), "should be present in dictionary"); |
851 } | |
852 #endif | |
853 | |
854 // return if the protection domain in NULL | |
855 if (protection_domain() == NULL) return k(); | |
856 | |
857 // Check the protection domain has the right access | |
858 { | |
859 MutexLocker mu(SystemDictionary_lock, THREAD); | |
860 // Note that we have an entry, and entries can be deleted only during GC, | |
861 // so we cannot allow GC to occur while we're holding this entry. | |
862 // We're using a No_Safepoint_Verifier to catch any place where we | |
863 // might potentially do a GC at all. | |
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864 // Dictionary::do_unloading() asserts that classes in SD are only |
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865 // unloaded at a safepoint. Anonymous classes are not in SD. |
0 | 866 No_Safepoint_Verifier nosafepoint; |
867 if (dictionary()->is_valid_protection_domain(d_index, d_hash, name, | |
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868 loader_data, |
0 | 869 protection_domain)) { |
870 return k(); | |
871 } | |
872 } | |
873 | |
874 // Verify protection domain. If it fails an exception is thrown | |
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875 validate_protection_domain(k, class_loader, protection_domain, CHECK_NULL); |
0 | 876 |
877 return k(); | |
878 } | |
879 | |
880 | |
881 // This routine does not lock the system dictionary. | |
882 // | |
883 // Since readers don't hold a lock, we must make sure that system | |
884 // dictionary entries are only removed at a safepoint (when only one | |
885 // thread is running), and are added to in a safe way (all links must | |
886 // be updated in an MT-safe manner). | |
887 // | |
888 // Callers should be aware that an entry could be added just after | |
889 // _dictionary->bucket(index) is read here, so the caller will not see | |
890 // the new entry. | |
891 | |
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892 Klass* SystemDictionary::find(Symbol* class_name, |
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893 Handle class_loader, |
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894 Handle protection_domain, |
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895 TRAPS) { |
0 | 896 |
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897 // UseNewReflection |
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898 // The result of this call should be consistent with the result |
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899 // of the call to resolve_instance_class_or_null(). |
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900 // See evaluation 6790209 and 4474172 for more details. |
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901 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); |
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902 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data_or_null(class_loader()); |
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903 |
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904 if (loader_data == NULL) { |
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905 // If the ClassLoaderData has not been setup, |
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906 // then the class loader has no entries in the dictionary. |
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907 return NULL; |
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908 } |
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909 |
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910 unsigned int d_hash = dictionary()->compute_hash(class_name, loader_data); |
0 | 911 int d_index = dictionary()->hash_to_index(d_hash); |
912 | |
913 { | |
914 // Note that we have an entry, and entries can be deleted only during GC, | |
915 // so we cannot allow GC to occur while we're holding this entry. | |
916 // We're using a No_Safepoint_Verifier to catch any place where we | |
917 // might potentially do a GC at all. | |
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918 // Dictionary::do_unloading() asserts that classes in SD are only |
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919 // unloaded at a safepoint. Anonymous classes are not in SD. |
0 | 920 No_Safepoint_Verifier nosafepoint; |
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921 return dictionary()->find(d_index, d_hash, class_name, loader_data, |
0 | 922 protection_domain, THREAD); |
923 } | |
924 } | |
925 | |
926 | |
927 // Look for a loaded instance or array klass by name. Do not do any loading. | |
928 // return NULL in case of error. | |
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929 Klass* SystemDictionary::find_instance_or_array_klass(Symbol* class_name, |
6831
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930 Handle class_loader, |
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931 Handle protection_domain, |
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932 TRAPS) { |
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933 Klass* k = NULL; |
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934 assert(class_name != NULL, "class name must be non NULL"); |
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935 |
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936 if (FieldType::is_array(class_name)) { |
0 | 937 // The name refers to an array. Parse the name. |
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938 // dimension and object_key in FieldArrayInfo are assigned as a |
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939 // side-effect of this call |
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940 FieldArrayInfo fd; |
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941 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
0 | 942 if (t != T_OBJECT) { |
943 k = Universe::typeArrayKlassObj(t); | |
944 } else { | |
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945 k = SystemDictionary::find(fd.object_key(), class_loader, protection_domain, THREAD); |
0 | 946 } |
947 if (k != NULL) { | |
6983 | 948 k = k->array_klass_or_null(fd.dimension()); |
0 | 949 } |
950 } else { | |
951 k = find(class_name, class_loader, protection_domain, THREAD); | |
952 } | |
953 return k; | |
954 } | |
955 | |
956 // Note: this method is much like resolve_from_stream, but | |
957 // updates no supplemental data structures. | |
958 // TODO consolidate the two methods with a helper routine? | |
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959 Klass* SystemDictionary::parse_stream(Symbol* class_name, |
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960 Handle class_loader, |
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961 Handle protection_domain, |
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962 ClassFileStream* st, |
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963 KlassHandle host_klass, |
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964 GrowableArray<Handle>* cp_patches, |
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965 TRAPS) { |
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966 TempNewSymbol parsed_name = NULL; |
0 | 967 |
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968 Ticks class_load_start_time = Ticks::now(); |
10405 | 969 |
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970 ClassLoaderData* loader_data; |
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971 if (host_klass.not_null()) { |
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972 // Create a new CLD for anonymous class, that uses the same class loader |
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973 // as the host_klass |
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974 assert(EnableInvokeDynamic, ""); |
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975 guarantee(host_klass->class_loader() == class_loader(), "should be the same"); |
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976 loader_data = ClassLoaderData::anonymous_class_loader_data(class_loader(), CHECK_NULL); |
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977 loader_data->record_dependency(host_klass(), CHECK_NULL); |
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978 } else { |
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979 loader_data = ClassLoaderData::class_loader_data(class_loader()); |
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980 } |
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981 |
0 | 982 // Parse the stream. Note that we do this even though this klass might |
983 // already be present in the SystemDictionary, otherwise we would not | |
984 // throw potential ClassFormatErrors. | |
985 // | |
986 // Note: "name" is updated. | |
987 | |
988 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
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989 loader_data, |
0 | 990 protection_domain, |
710 | 991 host_klass, |
992 cp_patches, | |
0 | 993 parsed_name, |
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994 true, |
0 | 995 THREAD); |
996 | |
997 | |
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998 if (host_klass.not_null() && k.not_null()) { |
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999 assert(EnableInvokeDynamic, ""); |
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1000 // If it's anonymous, initialize it now, since nobody else will. |
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1001 |
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1002 { |
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1003 MutexLocker mu_r(Compile_lock, THREAD); |
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1004 |
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1005 // Add to class hierarchy, initialize vtables, and do possible |
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1006 // deoptimizations. |
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1007 add_to_hierarchy(k, CHECK_NULL); // No exception, but can block |
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1008 |
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1009 // But, do not add to system dictionary. |
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1010 |
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1011 // compiled code dependencies need to be validated anyway |
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1012 notice_modification(); |
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1013 } |
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1014 |
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1015 // Rewrite and patch constant pool here. |
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1016 k->link_class(CHECK_NULL); |
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1017 if (cp_patches != NULL) { |
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1018 k->constants()->patch_resolved_references(cp_patches); |
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1019 } |
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1020 k->eager_initialize(CHECK_NULL); |
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1021 |
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1022 // notify jvmti |
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1023 if (JvmtiExport::should_post_class_load()) { |
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1024 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); |
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1025 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); |
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1026 } |
10405 | 1027 |
1028 post_class_load_event(class_load_start_time, k, class_loader); | |
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1029 } |
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1030 assert(host_klass.not_null() || cp_patches == NULL, |
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1031 "cp_patches only found with host_klass"); |
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1032 |
0 | 1033 return k(); |
1034 } | |
1035 | |
1036 // Add a klass to the system from a stream (called by jni_DefineClass and | |
1037 // JVM_DefineClass). | |
1038 // Note: class_name can be NULL. In that case we do not know the name of | |
1039 // the class until we have parsed the stream. | |
1040 | |
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1041 Klass* SystemDictionary::resolve_from_stream(Symbol* class_name, |
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1042 Handle class_loader, |
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1043 Handle protection_domain, |
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1044 ClassFileStream* st, |
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1045 bool verify, |
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1046 TRAPS) { |
0 | 1047 |
514 | 1048 // Classloaders that support parallelism, e.g. bootstrap classloader, |
1049 // or all classloaders with UnsyncloadClass do not acquire lock here | |
1050 bool DoObjectLock = true; | |
1051 if (is_parallelCapable(class_loader)) { | |
1052 DoObjectLock = false; | |
1053 } | |
1054 | |
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1055 ClassLoaderData* loader_data = register_loader(class_loader, CHECK_NULL); |
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1056 |
514 | 1057 // Make sure we are synchronized on the class loader before we proceed |
0 | 1058 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); |
1059 check_loader_lock_contention(lockObject, THREAD); | |
514 | 1060 ObjectLocker ol(lockObject, THREAD, DoObjectLock); |
0 | 1061 |
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1062 TempNewSymbol parsed_name = NULL; |
0 | 1063 |
1064 // Parse the stream. Note that we do this even though this klass might | |
1065 // already be present in the SystemDictionary, otherwise we would not | |
1066 // throw potential ClassFormatErrors. | |
1067 // | |
1068 // Note: "name" is updated. | |
1069 | |
1070 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
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1071 loader_data, |
0 | 1072 protection_domain, |
1073 parsed_name, | |
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1074 verify, |
0 | 1075 THREAD); |
1076 | |
1077 const char* pkg = "java/"; | |
1078 if (!HAS_PENDING_EXCEPTION && | |
1079 !class_loader.is_null() && | |
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1080 parsed_name != NULL && |
0 | 1081 !strncmp((const char*)parsed_name->bytes(), pkg, strlen(pkg))) { |
1082 // It is illegal to define classes in the "java." package from | |
1083 // JVM_DefineClass or jni_DefineClass unless you're the bootclassloader | |
1084 ResourceMark rm(THREAD); | |
1085 char* name = parsed_name->as_C_string(); | |
1086 char* index = strrchr(name, '/'); | |
1087 *index = '\0'; // chop to just the package name | |
1088 while ((index = strchr(name, '/')) != NULL) { | |
1089 *index = '.'; // replace '/' with '.' in package name | |
1090 } | |
1091 const char* fmt = "Prohibited package name: %s"; | |
1092 size_t len = strlen(fmt) + strlen(name); | |
1093 char* message = NEW_RESOURCE_ARRAY(char, len); | |
1094 jio_snprintf(message, len, fmt, name); | |
1095 Exceptions::_throw_msg(THREAD_AND_LOCATION, | |
1096 vmSymbols::java_lang_SecurityException(), message); | |
1097 } | |
1098 | |
1099 if (!HAS_PENDING_EXCEPTION) { | |
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1100 assert(parsed_name != NULL, "Sanity"); |
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1101 assert(class_name == NULL || class_name == parsed_name, "name mismatch"); |
0 | 1102 // Verification prevents us from creating names with dots in them, this |
1103 // asserts that that's the case. | |
1104 assert(is_internal_format(parsed_name), | |
1105 "external class name format used internally"); | |
1106 | |
1107 // Add class just loaded | |
514 | 1108 // If a class loader supports parallel classloading handle parallel define requests |
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1109 // find_or_define_instance_class may return a different InstanceKlass |
514 | 1110 if (is_parallelCapable(class_loader)) { |
1111 k = find_or_define_instance_class(class_name, class_loader, k, THREAD); | |
1112 } else { | |
1113 define_instance_class(k, THREAD); | |
1114 } | |
0 | 1115 } |
1116 | |
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1117 // Make sure we have an entry in the SystemDictionary on success |
0 | 1118 debug_only( { |
1119 if (!HAS_PENDING_EXCEPTION) { | |
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1120 assert(parsed_name != NULL, "parsed_name is still null?"); |
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1121 Symbol* h_name = k->name(); |
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1122 ClassLoaderData *defining_loader_data = k->class_loader_data(); |
0 | 1123 |
1124 MutexLocker mu(SystemDictionary_lock, THREAD); | |
1125 | |
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1126 Klass* check = find_class(parsed_name, loader_data); |
0 | 1127 assert(check == k(), "should be present in the dictionary"); |
1128 | |
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1129 Klass* check2 = find_class(h_name, defining_loader_data); |
0 | 1130 assert(check == check2, "name inconsistancy in SystemDictionary"); |
1131 } | |
1132 } ); | |
1133 | |
1134 return k(); | |
1135 } | |
1136 | |
1137 | |
6197 | 1138 void SystemDictionary::set_shared_dictionary(HashtableBucket<mtClass>* t, int length, |
0 | 1139 int number_of_entries) { |
6197 | 1140 assert(length == _nof_buckets * sizeof(HashtableBucket<mtClass>), |
0 | 1141 "bad shared dictionary size."); |
1142 _shared_dictionary = new Dictionary(_nof_buckets, t, number_of_entries); | |
1143 } | |
1144 | |
1145 | |
1146 // If there is a shared dictionary, then find the entry for the | |
1147 // given shared system class, if any. | |
1148 | |
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1149 Klass* SystemDictionary::find_shared_class(Symbol* class_name) { |
0 | 1150 if (shared_dictionary() != NULL) { |
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1151 unsigned int d_hash = shared_dictionary()->compute_hash(class_name, NULL); |
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1152 int d_index = shared_dictionary()->hash_to_index(d_hash); |
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1153 |
0 | 1154 return shared_dictionary()->find_shared_class(d_index, d_hash, class_name); |
1155 } else { | |
1156 return NULL; | |
1157 } | |
1158 } | |
1159 | |
1160 | |
1161 // Load a class from the shared spaces (found through the shared system | |
1162 // dictionary). Force the superclass and all interfaces to be loaded. | |
1163 // Update the class definition to include sibling classes and no | |
1164 // subclasses (yet). [Classes in the shared space are not part of the | |
1165 // object hierarchy until loaded.] | |
1166 | |
1167 instanceKlassHandle SystemDictionary::load_shared_class( | |
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1168 Symbol* class_name, Handle class_loader, TRAPS) { |
0 | 1169 instanceKlassHandle ik (THREAD, find_shared_class(class_name)); |
1170 return load_shared_class(ik, class_loader, THREAD); | |
1171 } | |
1172 | |
1173 instanceKlassHandle SystemDictionary::load_shared_class( | |
1174 instanceKlassHandle ik, Handle class_loader, TRAPS) { | |
1175 assert(class_loader.is_null(), "non-null classloader for shared class?"); | |
1176 if (ik.not_null()) { | |
1177 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1178 Symbol* class_name = ik->name(); |
0 | 1179 |
1180 // Found the class, now load the superclass and interfaces. If they | |
1181 // are shared, add them to the main system dictionary and reset | |
1182 // their hierarchy references (supers, subs, and interfaces). | |
1183 | |
1184 if (ik->super() != NULL) { | |
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1185 Symbol* cn = ik->super()->name(); |
0 | 1186 resolve_super_or_fail(class_name, cn, |
1187 class_loader, Handle(), true, CHECK_(nh)); | |
1188 } | |
1189 | |
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1190 Array<Klass*>* interfaces = ik->local_interfaces(); |
0 | 1191 int num_interfaces = interfaces->length(); |
1192 for (int index = 0; index < num_interfaces; index++) { | |
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1193 Klass* k = interfaces->at(index); |
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1194 |
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1195 // Note: can not use InstanceKlass::cast here because |
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1196 // interfaces' InstanceKlass's C++ vtbls haven't been |
0 | 1197 // reinitialized yet (they will be once the interface classes |
1198 // are loaded) | |
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1199 Symbol* name = k->name(); |
0 | 1200 resolve_super_or_fail(class_name, name, class_loader, Handle(), false, CHECK_(nh)); |
1201 } | |
1202 | |
1203 // Adjust methods to recover missing data. They need addresses for | |
1204 // interpreter entry points and their default native method address | |
1205 // must be reset. | |
1206 | |
1207 // Updating methods must be done under a lock so multiple | |
1208 // threads don't update these in parallel | |
1209 // Shared classes are all currently loaded by the bootstrap | |
1210 // classloader, so this will never cause a deadlock on | |
1211 // a custom class loader lock. | |
1212 | |
1213 { | |
1214 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
1215 check_loader_lock_contention(lockObject, THREAD); | |
1216 ObjectLocker ol(lockObject, THREAD, true); | |
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1217 ik->restore_unshareable_info(CHECK_(nh)); |
0 | 1218 } |
1219 | |
1220 if (TraceClassLoading) { | |
1221 ResourceMark rm; | |
1222 tty->print("[Loaded %s", ik->external_name()); | |
1223 tty->print(" from shared objects file"); | |
1224 tty->print_cr("]"); | |
1225 } | |
1226 // notify a class loaded from shared object | |
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1227 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(ik()), |
0 | 1228 true /* shared class */); |
1229 } | |
1230 return ik; | |
1231 } | |
1232 | |
1233 | |
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1234 instanceKlassHandle SystemDictionary::load_instance_class(Symbol* class_name, Handle class_loader, TRAPS) { |
0 | 1235 instanceKlassHandle nh = instanceKlassHandle(); // null Handle |
1236 if (class_loader.is_null()) { | |
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1237 |
0 | 1238 // Search the shared system dictionary for classes preloaded into the |
1239 // shared spaces. | |
1240 instanceKlassHandle k; | |
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1241 { |
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1242 PerfTraceTime vmtimer(ClassLoader::perf_shared_classload_time()); |
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1243 k = load_shared_class(class_name, class_loader, THREAD); |
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1244 } |
0 | 1245 |
1246 if (k.is_null()) { | |
1247 // Use VM class loader | |
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1248 PerfTraceTime vmtimer(ClassLoader::perf_sys_classload_time()); |
0 | 1249 k = ClassLoader::load_classfile(class_name, CHECK_(nh)); |
1250 } | |
1251 | |
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1252 // find_or_define_instance_class may return a different InstanceKlass |
0 | 1253 if (!k.is_null()) { |
1254 k = find_or_define_instance_class(class_name, class_loader, k, CHECK_(nh)); | |
1255 } | |
1256 return k; | |
1257 } else { | |
1258 // Use user specified class loader to load class. Call loadClass operation on class_loader. | |
1259 ResourceMark rm(THREAD); | |
1260 | |
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1261 assert(THREAD->is_Java_thread(), "must be a JavaThread"); |
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1262 JavaThread* jt = (JavaThread*) THREAD; |
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1263 |
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1264 PerfClassTraceTime vmtimer(ClassLoader::perf_app_classload_time(), |
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1265 ClassLoader::perf_app_classload_selftime(), |
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1266 ClassLoader::perf_app_classload_count(), |
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1267 jt->get_thread_stat()->perf_recursion_counts_addr(), |
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1268 jt->get_thread_stat()->perf_timers_addr(), |
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1269 PerfClassTraceTime::CLASS_LOAD); |
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1270 |
0 | 1271 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nh)); |
1272 // Translate to external class name format, i.e., convert '/' chars to '.' | |
1273 Handle string = java_lang_String::externalize_classname(s, CHECK_(nh)); | |
1274 | |
1275 JavaValue result(T_OBJECT); | |
1276 | |
1142 | 1277 KlassHandle spec_klass (THREAD, SystemDictionary::ClassLoader_klass()); |
0 | 1278 |
514 | 1279 // Call public unsynchronized loadClass(String) directly for all class loaders |
1280 // for parallelCapable class loaders. JDK >=7, loadClass(String, boolean) will | |
1281 // acquire a class-name based lock rather than the class loader object lock. | |
1282 // JDK < 7 already acquire the class loader lock in loadClass(String, boolean), | |
1283 // so the call to loadClassInternal() was not required. | |
1284 // | |
1285 // UnsyncloadClass flag means both call loadClass(String) and do | |
1286 // not acquire the class loader lock even for class loaders that are | |
1287 // not parallelCapable. This was a risky transitional | |
1288 // flag for diagnostic purposes only. It is risky to call | |
0 | 1289 // custom class loaders without synchronization. |
1290 // WARNING If a custom class loader does NOT synchronizer findClass, or callers of | |
514 | 1291 // findClass, the UnsyncloadClass flag risks unexpected timing bugs in the field. |
0 | 1292 // Do NOT assume this will be supported in future releases. |
514 | 1293 // |
1294 // Added MustCallLoadClassInternal in case we discover in the field | |
1295 // a customer that counts on this call | |
1296 if (MustCallLoadClassInternal && has_loadClassInternal()) { | |
0 | 1297 JavaCalls::call_special(&result, |
1298 class_loader, | |
1299 spec_klass, | |
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1300 vmSymbols::loadClassInternal_name(), |
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1301 vmSymbols::string_class_signature(), |
0 | 1302 string, |
1303 CHECK_(nh)); | |
1304 } else { | |
1305 JavaCalls::call_virtual(&result, | |
1306 class_loader, | |
1307 spec_klass, | |
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1308 vmSymbols::loadClass_name(), |
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1309 vmSymbols::string_class_signature(), |
0 | 1310 string, |
1311 CHECK_(nh)); | |
1312 } | |
1313 | |
1314 assert(result.get_type() == T_OBJECT, "just checking"); | |
1315 oop obj = (oop) result.get_jobject(); | |
1316 | |
1317 // Primitive classes return null since forName() can not be | |
1318 // used to obtain any of the Class objects representing primitives or void | |
1319 if ((obj != NULL) && !(java_lang_Class::is_primitive(obj))) { | |
1320 instanceKlassHandle k = | |
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1321 instanceKlassHandle(THREAD, java_lang_Class::as_Klass(obj)); |
0 | 1322 // For user defined Java class loaders, check that the name returned is |
1323 // the same as that requested. This check is done for the bootstrap | |
1324 // loader when parsing the class file. | |
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1325 if (class_name == k->name()) { |
0 | 1326 return k; |
1327 } | |
1328 } | |
1329 // Class is not found or has the wrong name, return NULL | |
1330 return nh; | |
1331 } | |
1332 } | |
1333 | |
1334 void SystemDictionary::define_instance_class(instanceKlassHandle k, TRAPS) { | |
1335 | |
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1336 ClassLoaderData* loader_data = k->class_loader_data(); |
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1337 Handle class_loader_h(THREAD, loader_data->class_loader()); |
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1338 |
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1339 for (uintx it = 0; it < GCExpandToAllocateDelayMillis; it++){} |
0 | 1340 |
514 | 1341 // for bootstrap and other parallel classloaders don't acquire lock, |
1342 // use placeholder token | |
1343 // If a parallelCapable class loader calls define_instance_class instead of | |
1344 // find_or_define_instance_class to get here, we have a timing | |
1345 // hole with systemDictionary updates and check_constraints | |
1346 if (!class_loader_h.is_null() && !is_parallelCapable(class_loader_h)) { | |
0 | 1347 assert(ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, |
1348 compute_loader_lock_object(class_loader_h, THREAD)), | |
1349 "define called without lock"); | |
1350 } | |
1351 | |
1352 // Check class-loading constraints. Throw exception if violation is detected. | |
1353 // Grabs and releases SystemDictionary_lock | |
1354 // The check_constraints/find_class call and update_dictionary sequence | |
1355 // must be "atomic" for a specific class/classloader pair so we never | |
1356 // define two different instanceKlasses for that class/classloader pair. | |
1357 // Existing classloaders will call define_instance_class with the | |
1358 // classloader lock held | |
1359 // Parallel classloaders will call find_or_define_instance_class | |
1360 // which will require a token to perform the define class | |
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1361 Symbol* name_h = k->name(); |
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1362 unsigned int d_hash = dictionary()->compute_hash(name_h, loader_data); |
0 | 1363 int d_index = dictionary()->hash_to_index(d_hash); |
1364 check_constraints(d_index, d_hash, k, class_loader_h, true, CHECK); | |
1365 | |
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1366 // Register class just loaded with class loader (placed in Vector) |
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1367 // Note we do this before updating the dictionary, as this can |
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1368 // fail with an OutOfMemoryError (if it does, we will *not* put this |
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1369 // class in the dictionary and will not update the class hierarchy). |
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1370 // JVMTI FollowReferences needs to find the classes this way. |
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1371 if (k->class_loader() != NULL) { |
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1372 methodHandle m(THREAD, Universe::loader_addClass_method()); |
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1373 JavaValue result(T_VOID); |
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1374 JavaCallArguments args(class_loader_h); |
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1375 args.push_oop(Handle(THREAD, k->java_mirror())); |
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1376 JavaCalls::call(&result, m, &args, CHECK); |
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1377 } |
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1378 |
0 | 1379 // Add the new class. We need recompile lock during update of CHA. |
1380 { | |
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1381 unsigned int p_hash = placeholders()->compute_hash(name_h, loader_data); |
0 | 1382 int p_index = placeholders()->hash_to_index(p_hash); |
1383 | |
1384 MutexLocker mu_r(Compile_lock, THREAD); | |
1385 | |
1386 // Add to class hierarchy, initialize vtables, and do possible | |
1387 // deoptimizations. | |
1388 add_to_hierarchy(k, CHECK); // No exception, but can block | |
1389 | |
1390 // Add to systemDictionary - so other classes can see it. | |
1391 // Grabs and releases SystemDictionary_lock | |
1392 update_dictionary(d_index, d_hash, p_index, p_hash, | |
1393 k, class_loader_h, THREAD); | |
1394 } | |
1395 k->eager_initialize(THREAD); | |
1396 | |
1397 // notify jvmti | |
1398 if (JvmtiExport::should_post_class_load()) { | |
1399 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); | |
1400 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); | |
1401 | |
1402 } | |
10405 | 1403 |
0 | 1404 } |
1405 | |
1406 // Support parallel classloading | |
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1407 // All parallel class loaders, including bootstrap classloader |
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1408 // lock a placeholder entry for this class/class_loader pair |
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1409 // to allow parallel defines of different classes for this class loader |
514 | 1410 // With AllowParallelDefine flag==true, in case they do not synchronize around |
1411 // FindLoadedClass/DefineClass, calls, we check for parallel | |
0 | 1412 // loading for them, wait if a defineClass is in progress |
1413 // and return the initial requestor's results | |
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1414 // This flag does not apply to the bootstrap classloader. |
514 | 1415 // With AllowParallelDefine flag==false, call through to define_instance_class |
1416 // which will throw LinkageError: duplicate class definition. | |
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1417 // False is the requested default. |
0 | 1418 // For better performance, the class loaders should synchronize |
514 | 1419 // findClass(), i.e. FindLoadedClass/DefineClassIfAbsent or they |
0 | 1420 // potentially waste time reading and parsing the bytestream. |
1421 // Note: VM callers should ensure consistency of k/class_name,class_loader | |
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1422 instanceKlassHandle SystemDictionary::find_or_define_instance_class(Symbol* class_name, Handle class_loader, instanceKlassHandle k, TRAPS) { |
0 | 1423 |
1424 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1425 Symbol* name_h = k->name(); // passed in class_name may be null |
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1426 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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1427 |
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1428 unsigned int d_hash = dictionary()->compute_hash(name_h, loader_data); |
0 | 1429 int d_index = dictionary()->hash_to_index(d_hash); |
1430 | |
1431 // Hold SD lock around find_class and placeholder creation for DEFINE_CLASS | |
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1432 unsigned int p_hash = placeholders()->compute_hash(name_h, loader_data); |
0 | 1433 int p_index = placeholders()->hash_to_index(p_hash); |
1434 PlaceholderEntry* probe; | |
1435 | |
1436 { | |
1437 MutexLocker mu(SystemDictionary_lock, THREAD); | |
1438 // First check if class already defined | |
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1439 if (UnsyncloadClass || (is_parallelDefine(class_loader))) { |
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1440 Klass* check = find_class(d_index, d_hash, name_h, loader_data); |
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1441 if (check != NULL) { |
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1442 return(instanceKlassHandle(THREAD, check)); |
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1443 } |
0 | 1444 } |
1445 | |
1446 // Acquire define token for this class/classloader | |
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1447 probe = placeholders()->find_and_add(p_index, p_hash, name_h, loader_data, PlaceholderTable::DEFINE_CLASS, NULL, THREAD); |
514 | 1448 // Wait if another thread defining in parallel |
1449 // All threads wait - even those that will throw duplicate class: otherwise | |
1450 // caller is surprised by LinkageError: duplicate, but findLoadedClass fails | |
1451 // if other thread has not finished updating dictionary | |
1452 while (probe->definer() != NULL) { | |
1453 SystemDictionary_lock->wait(); | |
1454 } | |
1455 // Only special cases allow parallel defines and can use other thread's results | |
1456 // Other cases fall through, and may run into duplicate defines | |
1457 // caught by finding an entry in the SystemDictionary | |
6983 | 1458 if ((UnsyncloadClass || is_parallelDefine(class_loader)) && (probe->instance_klass() != NULL)) { |
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1459 placeholders()->find_and_remove(p_index, p_hash, name_h, loader_data, PlaceholderTable::DEFINE_CLASS, THREAD); |
514 | 1460 SystemDictionary_lock->notify_all(); |
0 | 1461 #ifdef ASSERT |
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1462 Klass* check = find_class(d_index, d_hash, name_h, loader_data); |
514 | 1463 assert(check != NULL, "definer missed recording success"); |
0 | 1464 #endif |
6983 | 1465 return(instanceKlassHandle(THREAD, probe->instance_klass())); |
0 | 1466 } else { |
514 | 1467 // This thread will define the class (even if earlier thread tried and had an error) |
1468 probe->set_definer(THREAD); | |
0 | 1469 } |
1470 } | |
1471 | |
1472 define_instance_class(k, THREAD); | |
1473 | |
1474 Handle linkage_exception = Handle(); // null handle | |
1475 | |
1476 // definer must notify any waiting threads | |
1477 { | |
1478 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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1479 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name_h, loader_data); |
0 | 1480 assert(probe != NULL, "DEFINE_CLASS placeholder lost?"); |
1481 if (probe != NULL) { | |
1482 if (HAS_PENDING_EXCEPTION) { | |
1483 linkage_exception = Handle(THREAD,PENDING_EXCEPTION); | |
1484 CLEAR_PENDING_EXCEPTION; | |
1485 } else { | |
6983 | 1486 probe->set_instance_klass(k()); |
0 | 1487 } |
1488 probe->set_definer(NULL); | |
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1489 placeholders()->find_and_remove(p_index, p_hash, name_h, loader_data, PlaceholderTable::DEFINE_CLASS, THREAD); |
0 | 1490 SystemDictionary_lock->notify_all(); |
1491 } | |
1492 } | |
1493 | |
1494 // Can't throw exception while holding lock due to rank ordering | |
1495 if (linkage_exception() != NULL) { | |
1496 THROW_OOP_(linkage_exception(), nh); // throws exception and returns | |
1497 } | |
1498 | |
1499 return k; | |
1500 } | |
1501 Handle SystemDictionary::compute_loader_lock_object(Handle class_loader, TRAPS) { | |
1502 // If class_loader is NULL we synchronize on _system_loader_lock_obj | |
1503 if (class_loader.is_null()) { | |
1504 return Handle(THREAD, _system_loader_lock_obj); | |
1505 } else { | |
1506 return class_loader; | |
1507 } | |
1508 } | |
1509 | |
1510 // This method is added to check how often we have to wait to grab loader | |
1511 // lock. The results are being recorded in the performance counters defined in | |
1512 // ClassLoader::_sync_systemLoaderLockContentionRate and | |
1513 // ClassLoader::_sync_nonSystemLoaderLockConteionRate. | |
1514 void SystemDictionary::check_loader_lock_contention(Handle loader_lock, TRAPS) { | |
1515 if (!UsePerfData) { | |
1516 return; | |
1517 } | |
1518 | |
1519 assert(!loader_lock.is_null(), "NULL lock object"); | |
1520 | |
1521 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader_lock) | |
1522 == ObjectSynchronizer::owner_other) { | |
1523 // contention will likely happen, so increment the corresponding | |
1524 // contention counter. | |
1525 if (loader_lock() == _system_loader_lock_obj) { | |
1526 ClassLoader::sync_systemLoaderLockContentionRate()->inc(); | |
1527 } else { | |
1528 ClassLoader::sync_nonSystemLoaderLockContentionRate()->inc(); | |
1529 } | |
1530 } | |
1531 } | |
1532 | |
1533 // ---------------------------------------------------------------------------- | |
1534 // Lookup | |
1535 | |
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1536 Klass* SystemDictionary::find_class(int index, unsigned int hash, |
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1537 Symbol* class_name, |
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1538 ClassLoaderData* loader_data) { |
0 | 1539 assert_locked_or_safepoint(SystemDictionary_lock); |
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1540 assert (index == dictionary()->index_for(class_name, loader_data), |
0 | 1541 "incorrect index?"); |
1542 | |
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1543 Klass* k = dictionary()->find_class(index, hash, class_name, loader_data); |
0 | 1544 return k; |
1545 } | |
1546 | |
1547 | |
1548 // Basic find on classes in the midst of being loaded | |
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1549 Symbol* SystemDictionary::find_placeholder(Symbol* class_name, |
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1550 ClassLoaderData* loader_data) { |
0 | 1551 assert_locked_or_safepoint(SystemDictionary_lock); |
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1552 unsigned int p_hash = placeholders()->compute_hash(class_name, loader_data); |
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1553 int p_index = placeholders()->hash_to_index(p_hash); |
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1554 return placeholders()->find_entry(p_index, p_hash, class_name, loader_data); |
0 | 1555 } |
1556 | |
1557 | |
1558 // Used for assertions and verification only | |
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1559 Klass* SystemDictionary::find_class(Symbol* class_name, ClassLoaderData* loader_data) { |
0 | 1560 #ifndef ASSERT |
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1561 guarantee(VerifyBeforeGC || |
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1562 VerifyDuringGC || |
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1563 VerifyBeforeExit || |
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1564 VerifyDuringStartup || |
0 | 1565 VerifyAfterGC, "too expensive"); |
1566 #endif | |
1567 assert_locked_or_safepoint(SystemDictionary_lock); | |
1568 | |
1569 // First look in the loaded class array | |
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1570 unsigned int d_hash = dictionary()->compute_hash(class_name, loader_data); |
0 | 1571 int d_index = dictionary()->hash_to_index(d_hash); |
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1572 return find_class(d_index, d_hash, class_name, loader_data); |
0 | 1573 } |
1574 | |
1575 | |
1576 // Get the next class in the diictionary. | |
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1577 Klass* SystemDictionary::try_get_next_class() { |
0 | 1578 return dictionary()->try_get_next_class(); |
1579 } | |
1580 | |
1581 | |
1582 // ---------------------------------------------------------------------------- | |
1583 // Update hierachy. This is done before the new klass has been added to the SystemDictionary. The Recompile_lock | |
1584 // is held, to ensure that the compiler is not using the class hierachy, and that deoptimization will kick in | |
1585 // before a new class is used. | |
1586 | |
1587 void SystemDictionary::add_to_hierarchy(instanceKlassHandle k, TRAPS) { | |
1588 assert(k.not_null(), "just checking"); | |
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1589 assert_locked_or_safepoint(Compile_lock); |
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1590 |
0 | 1591 // Link into hierachy. Make sure the vtables are initialized before linking into |
1592 k->append_to_sibling_list(); // add to superklass/sibling list | |
1593 k->process_interfaces(THREAD); // handle all "implements" declarations | |
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1594 k->set_init_state(InstanceKlass::loaded); |
0 | 1595 // Now flush all code that depended on old class hierarchy. |
1596 // Note: must be done *after* linking k into the hierarchy (was bug 12/9/97) | |
1597 // Also, first reinitialize vtable because it may have gotten out of synch | |
1598 // while the new class wasn't connected to the class hierarchy. | |
1599 Universe::flush_dependents_on(k); | |
1600 } | |
1601 | |
1602 | |
1603 // ---------------------------------------------------------------------------- | |
1604 // GC support | |
1605 | |
1606 // Following roots during mark-sweep is separated in two phases. | |
1607 // | |
1608 // The first phase follows preloaded classes and all other system | |
1609 // classes, since these will never get unloaded anyway. | |
1610 // | |
1611 // The second phase removes (unloads) unreachable classes from the | |
1612 // system dictionary and follows the remaining classes' contents. | |
1613 | |
1614 void SystemDictionary::always_strong_oops_do(OopClosure* blk) { | |
1615 blk->do_oop(&_java_system_loader); | |
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1616 blk->do_oop(&_system_loader_lock_obj); |
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1617 |
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1618 dictionary()->always_strong_oops_do(blk); |
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1619 |
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1620 // Visit extra methods |
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1621 invoke_method_table()->oops_do(blk); |
0 | 1622 } |
1623 | |
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1624 void SystemDictionary::always_strong_classes_do(KlassClosure* closure) { |
0 | 1625 // Follow all system classes and temporary placeholders in dictionary |
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1626 dictionary()->always_strong_classes_do(closure); |
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1627 |
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1628 // Placeholders. These represent classes we're actively loading. |
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1629 placeholders()->classes_do(closure); |
0 | 1630 } |
1631 | |
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1632 // Calculate a "good" systemdictionary size based |
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1633 // on predicted or current loaded classes count |
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1634 int SystemDictionary::calculate_systemdictionary_size(int classcount) { |
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1635 int newsize = _old_default_sdsize; |
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1636 if ((classcount > 0) && !DumpSharedSpaces) { |
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1637 int desiredsize = classcount/_average_depth_goal; |
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1638 for (newsize = _primelist[_sdgeneration]; _sdgeneration < _prime_array_size -1; |
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1639 newsize = _primelist[++_sdgeneration]) { |
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1640 if (desiredsize <= newsize) { |
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1641 break; |
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1642 } |
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1643 } |
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1644 } |
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1645 return newsize; |
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1646 } |
10405 | 1647 |
12837 | 1648 #ifdef ASSERT |
1649 class VerifySDReachableAndLiveClosure : public OopClosure { | |
1650 private: | |
1651 BoolObjectClosure* _is_alive; | |
1652 | |
1653 template <class T> void do_oop_work(T* p) { | |
1654 oop obj = oopDesc::load_decode_heap_oop(p); | |
1655 guarantee(_is_alive->do_object_b(obj), "Oop in system dictionary must be live"); | |
1656 } | |
1657 | |
1658 public: | |
1659 VerifySDReachableAndLiveClosure(BoolObjectClosure* is_alive) : OopClosure(), _is_alive(is_alive) { } | |
1660 | |
1661 virtual void do_oop(oop* p) { do_oop_work(p); } | |
1662 virtual void do_oop(narrowOop* p) { do_oop_work(p); } | |
1663 }; | |
1664 #endif | |
1665 | |
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1666 // Assumes classes in the SystemDictionary are only unloaded at a safepoint |
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1667 // Note: anonymous classes are not in the SD. |
0 | 1668 bool SystemDictionary::do_unloading(BoolObjectClosure* is_alive) { |
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1669 // First, mark for unload all ClassLoaderData referencing a dead class loader. |
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1670 bool has_dead_loaders = ClassLoaderDataGraph::do_unloading(is_alive); |
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1671 bool unloading_occurred = false; |
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1672 if (has_dead_loaders) { |
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1673 unloading_occurred = dictionary()->do_unloading(); |
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1674 constraints()->purge_loader_constraints(); |
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1675 resolution_errors()->purge_resolution_errors(); |
12837 | 1676 } |
1677 // Oops referenced by the system dictionary may get unreachable independently | |
1678 // of the class loader (eg. cached protection domain oops). So we need to | |
1679 // explicitly unlink them here instead of in Dictionary::do_unloading. | |
1680 dictionary()->unlink(is_alive); | |
1681 #ifdef ASSERT | |
1682 VerifySDReachableAndLiveClosure cl(is_alive); | |
1683 dictionary()->oops_do(&cl); | |
1684 #endif | |
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1685 return unloading_occurred; |
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1686 } |
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1687 |
0 | 1688 void SystemDictionary::oops_do(OopClosure* f) { |
1689 f->do_oop(&_java_system_loader); | |
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1690 f->do_oop(&_system_loader_lock_obj); |
0 | 1691 |
1692 // Adjust dictionary | |
1693 dictionary()->oops_do(f); | |
1694 | |
710 | 1695 // Visit extra methods |
1903 | 1696 invoke_method_table()->oops_do(f); |
0 | 1697 } |
1698 | |
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1699 // Extended Class redefinition support. |
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1700 // If one of these classes is replaced, we need to replace it in these places. |
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1701 // KlassClosure::do_klass should take the address of a class but we can |
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1702 // change that later. |
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1703 void SystemDictionary::preloaded_classes_do(KlassClosure* f) { |
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1704 for (int k = (int)FIRST_WKID; k < (int)WKID_LIMIT; k++) { |
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1705 f->do_klass(_well_known_klasses[k]); |
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1706 } |
0 | 1707 |
1708 { | |
1709 for (int i = 0; i < T_VOID+1; i++) { | |
1710 if (_box_klasses[i] != NULL) { | |
1711 assert(i >= T_BOOLEAN, "checking"); | |
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1712 f->do_klass(_box_klasses[i]); |
0 | 1713 } |
1714 } | |
1715 } | |
1716 | |
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1717 FilteredFieldsMap::classes_do(f); |
0 | 1718 } |
1719 | |
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1720 void SystemDictionary::lazily_loaded_classes_do(KlassClosure* f) { |
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1721 f->do_klass(_abstract_ownable_synchronizer_klass); |
0 | 1722 } |
1723 | |
1724 // Just the classes from defining class loaders | |
1725 // Don't iterate over placeholders | |
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1726 void SystemDictionary::classes_do(void f(Klass*)) { |
0 | 1727 dictionary()->classes_do(f); |
1728 } | |
1729 | |
1730 // Added for initialize_itable_for_klass | |
1731 // Just the classes from defining class loaders | |
1732 // Don't iterate over placeholders | |
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1733 void SystemDictionary::classes_do(void f(Klass*, TRAPS), TRAPS) { |
0 | 1734 dictionary()->classes_do(f, CHECK); |
1735 } | |
1736 | |
1737 // All classes, and their class loaders | |
1738 // Don't iterate over placeholders | |
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1739 void SystemDictionary::classes_do(void f(Klass*, ClassLoaderData*)) { |
0 | 1740 dictionary()->classes_do(f); |
1741 } | |
1742 | |
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1743 void SystemDictionary::placeholders_do(void f(Symbol*)) { |
0 | 1744 placeholders()->entries_do(f); |
1745 } | |
1746 | |
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1747 void SystemDictionary::methods_do(void f(Method*)) { |
0 | 1748 dictionary()->methods_do(f); |
1903 | 1749 invoke_method_table()->methods_do(f); |
0 | 1750 } |
1751 | |
1752 // ---------------------------------------------------------------------------- | |
1753 // Lazily load klasses | |
1754 | |
1755 void SystemDictionary::load_abstract_ownable_synchronizer_klass(TRAPS) { | |
1756 assert(JDK_Version::is_gte_jdk16x_version(), "Must be JDK 1.6 or later"); | |
1757 | |
1758 // if multiple threads calling this function, only one thread will load | |
1759 // the class. The other threads will find the loaded version once the | |
1760 // class is loaded. | |
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1761 Klass* aos = _abstract_ownable_synchronizer_klass; |
0 | 1762 if (aos == NULL) { |
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1763 Klass* k = resolve_or_fail(vmSymbols::java_util_concurrent_locks_AbstractOwnableSynchronizer(), true, CHECK); |
0 | 1764 // Force a fence to prevent any read before the write completes |
1765 OrderAccess::fence(); | |
1766 _abstract_ownable_synchronizer_klass = k; | |
1767 } | |
1768 } | |
1769 | |
1770 // ---------------------------------------------------------------------------- | |
1771 // Initialization | |
1772 | |
1773 void SystemDictionary::initialize(TRAPS) { | |
1774 // Allocate arrays | |
1775 assert(dictionary() == NULL, | |
1776 "SystemDictionary should only be initialized once"); | |
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1777 _sdgeneration = 0; |
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1778 _dictionary = new Dictionary(calculate_systemdictionary_size(PredictedLoadedClassCount)); |
1903 | 1779 _placeholders = new PlaceholderTable(_nof_buckets); |
0 | 1780 _number_of_modifications = 0; |
1903 | 1781 _loader_constraints = new LoaderConstraintTable(_loader_constraint_size); |
1782 _resolution_errors = new ResolutionErrorTable(_resolution_error_size); | |
1783 _invoke_method_table = new SymbolPropertyTable(_invoke_method_size); | |
0 | 1784 |
1785 // Allocate private object used as system class loader lock | |
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1786 _system_loader_lock_obj = oopFactory::new_intArray(0, CHECK); |
0 | 1787 // Initialize basic classes |
1788 initialize_preloaded_classes(CHECK); | |
1789 } | |
1790 | |
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1791 // Compact table of directions on the initialization of klasses: |
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1792 static const short wk_init_info[] = { |
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1793 #define WK_KLASS_INIT_INFO(name, symbol, option) \ |
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1794 ( ((int)vmSymbols::VM_SYMBOL_ENUM_NAME(symbol) \ |
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1795 << SystemDictionary::CEIL_LG_OPTION_LIMIT) \ |
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1796 | (int)SystemDictionary::option ), |
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1797 WK_KLASSES_DO(WK_KLASS_INIT_INFO) |
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1798 #undef WK_KLASS_INIT_INFO |
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1799 0 |
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1800 }; |
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1801 |
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1802 bool SystemDictionary::initialize_wk_klass(WKID id, int init_opt, TRAPS) { |
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1803 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1804 int info = wk_init_info[id - FIRST_WKID]; |
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1805 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1806 Symbol* symbol = vmSymbols::symbol_at((vmSymbols::SID)sid); |
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1807 Klass** klassp = &_well_known_klasses[id]; |
2460 | 1808 bool must_load = (init_opt < SystemDictionary::Opt); |
7951 | 1809 if ((*klassp) == NULL) { |
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1810 if (must_load) { |
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1811 (*klassp) = resolve_or_fail(symbol, true, CHECK_0); // load required class |
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1812 } else { |
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1813 (*klassp) = resolve_or_null(symbol, CHECK_0); // load optional klass |
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1814 } |
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1815 } |
2460 | 1816 return ((*klassp) != NULL); |
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1817 } |
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1818 |
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1819 void SystemDictionary::initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS) { |
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1820 assert((int)start_id <= (int)limit_id, "IDs are out of order!"); |
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1821 for (int id = (int)start_id; id < (int)limit_id; id++) { |
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1822 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1823 int info = wk_init_info[id - FIRST_WKID]; |
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1824 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1825 int opt = (info & right_n_bits(CEIL_LG_OPTION_LIMIT)); |
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1826 |
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1827 initialize_wk_klass((WKID)id, opt, CHECK); |
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1828 } |
710 | 1829 |
1830 // move the starting value forward to the limit: | |
1831 start_id = limit_id; | |
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1832 } |
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1833 |
0 | 1834 void SystemDictionary::initialize_preloaded_classes(TRAPS) { |
1142 | 1835 assert(WK_KLASS(Object_klass) == NULL, "preloaded classes should only be initialized once"); |
0 | 1836 // Preload commonly used klasses |
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1837 WKID scan = FIRST_WKID; |
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1838 // first do Object, then String, Class |
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1839 if (UseSharedSpaces) { |
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1840 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Object_klass), scan, CHECK); |
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1841 // Initialize the constant pool for the Object_class |
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1842 InstanceKlass* ik = InstanceKlass::cast(Object_klass()); |
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1843 ik->constants()->restore_unshareable_info(CHECK); |
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1844 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Class_klass), scan, CHECK); |
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1845 } else { |
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1846 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Class_klass), scan, CHECK); |
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1847 } |
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1848 |
6057 | 1849 // Calculate offsets for String and Class classes since they are loaded and |
1850 // can be used after this point. | |
1851 java_lang_String::compute_offsets(); | |
3938 | 1852 java_lang_Class::compute_offsets(); |
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1853 |
0 | 1854 // Fixup mirrors for classes loaded before java.lang.Class. |
1855 // These calls iterate over the objects currently in the perm gen | |
1856 // so calling them at this point is matters (not before when there | |
1857 // are fewer objects and not later after there are more objects | |
1858 // in the perm gen. | |
1859 Universe::initialize_basic_type_mirrors(CHECK); | |
1860 Universe::fixup_mirrors(CHECK); | |
1861 | |
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1862 // do a bunch more: |
1142 | 1863 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Reference_klass), scan, CHECK); |
0 | 1864 |
1865 // Preload ref klasses and set reference types | |
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1866 InstanceKlass::cast(WK_KLASS(Reference_klass))->set_reference_type(REF_OTHER); |
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1867 InstanceRefKlass::update_nonstatic_oop_maps(WK_KLASS(Reference_klass)); |
0 | 1868 |
1142 | 1869 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(PhantomReference_klass), scan, CHECK); |
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1870 InstanceKlass::cast(WK_KLASS(SoftReference_klass))->set_reference_type(REF_SOFT); |
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1871 InstanceKlass::cast(WK_KLASS(WeakReference_klass))->set_reference_type(REF_WEAK); |
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1872 InstanceKlass::cast(WK_KLASS(FinalReference_klass))->set_reference_type(REF_FINAL); |
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1873 InstanceKlass::cast(WK_KLASS(PhantomReference_klass))->set_reference_type(REF_PHANTOM); |
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1874 |
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1875 // JSR 292 classes |
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1876 WKID jsr292_group_start = WK_KLASS_ENUM_NAME(MethodHandle_klass); |
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1877 WKID jsr292_group_end = WK_KLASS_ENUM_NAME(VolatileCallSite_klass); |
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1878 initialize_wk_klasses_until(jsr292_group_start, scan, CHECK); |
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1879 if (EnableInvokeDynamic) { |
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1880 initialize_wk_klasses_through(jsr292_group_end, scan, CHECK); |
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1881 } else { |
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1882 // Skip the JSR 292 classes, if not enabled. |
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1883 scan = WKID(jsr292_group_end + 1); |
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1884 } |
710 | 1885 |
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1886 initialize_wk_klasses_until(WKID_LIMIT, scan, CHECK); |
0 | 1887 |
1142 | 1888 _box_klasses[T_BOOLEAN] = WK_KLASS(Boolean_klass); |
1889 _box_klasses[T_CHAR] = WK_KLASS(Character_klass); | |
1890 _box_klasses[T_FLOAT] = WK_KLASS(Float_klass); | |
1891 _box_klasses[T_DOUBLE] = WK_KLASS(Double_klass); | |
1892 _box_klasses[T_BYTE] = WK_KLASS(Byte_klass); | |
1893 _box_klasses[T_SHORT] = WK_KLASS(Short_klass); | |
1894 _box_klasses[T_INT] = WK_KLASS(Integer_klass); | |
1895 _box_klasses[T_LONG] = WK_KLASS(Long_klass); | |
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1896 //_box_klasses[T_OBJECT] = WK_KLASS(object_klass); |
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1897 //_box_klasses[T_ARRAY] = WK_KLASS(object_klass); |
0 | 1898 |
1899 { // Compute whether we should use loadClass or loadClassInternal when loading classes. | |
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1900 Method* method = InstanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::loadClassInternal_name(), vmSymbols::string_class_signature()); |
0 | 1901 _has_loadClassInternal = (method != NULL); |
1902 } | |
1903 { // Compute whether we should use checkPackageAccess or NOT | |
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1904 Method* method = InstanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::checkPackageAccess_name(), vmSymbols::class_protectiondomain_signature()); |
0 | 1905 _has_checkPackageAccess = (method != NULL); |
1906 } | |
1907 } | |
1908 | |
1909 // Tells if a given klass is a box (wrapper class, such as java.lang.Integer). | |
1910 // If so, returns the basic type it holds. If not, returns T_OBJECT. | |
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1911 BasicType SystemDictionary::box_klass_type(Klass* k) { |
0 | 1912 assert(k != NULL, ""); |
1913 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { | |
1914 if (_box_klasses[i] == k) | |
1915 return (BasicType)i; | |
1916 } | |
1917 return T_OBJECT; | |
1918 } | |
1919 | |
1920 // Constraints on class loaders. The details of the algorithm can be | |
1921 // found in the OOPSLA'98 paper "Dynamic Class Loading in the Java | |
1922 // Virtual Machine" by Sheng Liang and Gilad Bracha. The basic idea is | |
1923 // that the system dictionary needs to maintain a set of contraints that | |
1924 // must be satisfied by all classes in the dictionary. | |
1925 // if defining is true, then LinkageError if already in systemDictionary | |
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1926 // if initiating loader, then ok if InstanceKlass matches existing entry |
0 | 1927 |
1928 void SystemDictionary::check_constraints(int d_index, unsigned int d_hash, | |
1929 instanceKlassHandle k, | |
1930 Handle class_loader, bool defining, | |
1931 TRAPS) { | |
1932 const char *linkage_error = NULL; | |
1933 { | |
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1934 Symbol* name = k->name(); |
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1935 ClassLoaderData *loader_data = class_loader_data(class_loader); |
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1936 |
0 | 1937 MutexLocker mu(SystemDictionary_lock, THREAD); |
1938 | |
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1939 Klass* check = find_class(d_index, d_hash, name, loader_data); |
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1940 if (check != (Klass*)NULL) { |
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1941 // if different InstanceKlass - duplicate class definition, |
0 | 1942 // else - ok, class loaded by a different thread in parallel, |
1943 // we should only have found it if it was done loading and ok to use | |
1944 // system dictionary only holds instance classes, placeholders | |
1945 // also holds array classes | |
1946 | |
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1947 assert(check->oop_is_instance(), "noninstance in systemdictionary"); |
0 | 1948 if ((defining == true) || (k() != check)) { |
1949 linkage_error = "loader (instance of %s): attempted duplicate class " | |
1950 "definition for name: \"%s\""; | |
1951 } else { | |
1952 return; | |
1953 } | |
1954 } | |
1955 | |
1956 #ifdef ASSERT | |
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1957 Symbol* ph_check = find_placeholder(name, loader_data); |
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1958 assert(ph_check == NULL || ph_check == name, "invalid symbol"); |
0 | 1959 #endif |
1960 | |
1961 if (linkage_error == NULL) { | |
1962 if (constraints()->check_or_update(k, class_loader, name) == false) { | |
1963 linkage_error = "loader constraint violation: loader (instance of %s)" | |
1964 " previously initiated loading for a different type with name \"%s\""; | |
1965 } | |
1966 } | |
1967 } | |
1968 | |
1969 // Throw error now if needed (cannot throw while holding | |
1970 // SystemDictionary_lock because of rank ordering) | |
1971 | |
1972 if (linkage_error) { | |
1973 ResourceMark rm(THREAD); | |
1974 const char* class_loader_name = loader_name(class_loader()); | |
1975 char* type_name = k->name()->as_C_string(); | |
1976 size_t buflen = strlen(linkage_error) + strlen(class_loader_name) + | |
1977 strlen(type_name); | |
1978 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
1979 jio_snprintf(buf, buflen, linkage_error, class_loader_name, type_name); | |
1980 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); | |
1981 } | |
1982 } | |
1983 | |
1984 | |
1985 // Update system dictionary - done after check_constraint and add_to_hierachy | |
1986 // have been called. | |
1987 void SystemDictionary::update_dictionary(int d_index, unsigned int d_hash, | |
1988 int p_index, unsigned int p_hash, | |
1989 instanceKlassHandle k, | |
1990 Handle class_loader, | |
1991 TRAPS) { | |
1992 // Compile_lock prevents systemDictionary updates during compilations | |
1993 assert_locked_or_safepoint(Compile_lock); | |
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1994 Symbol* name = k->name(); |
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1995 ClassLoaderData *loader_data = class_loader_data(class_loader); |
0 | 1996 |
1997 { | |
1998 MutexLocker mu1(SystemDictionary_lock, THREAD); | |
1999 | |
2000 // See whether biased locking is enabled and if so set it for this | |
2001 // klass. | |
2002 // Note that this must be done past the last potential blocking | |
2003 // point / safepoint. We enable biased locking lazily using a | |
2004 // VM_Operation to iterate the SystemDictionary and installing the | |
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2005 // biasable mark word into each InstanceKlass's prototype header. |
0 | 2006 // To avoid race conditions where we accidentally miss enabling the |
2007 // optimization for one class in the process of being added to the | |
2008 // dictionary, we must not safepoint after the test of | |
2009 // BiasedLocking::enabled(). | |
2010 if (UseBiasedLocking && BiasedLocking::enabled()) { | |
2011 // Set biased locking bit for all loaded classes; it will be | |
2012 // cleared if revocation occurs too often for this type | |
2013 // NOTE that we must only do this when the class is initally | |
2014 // defined, not each time it is referenced from a new class loader | |
2015 if (k->class_loader() == class_loader()) { | |
2016 k->set_prototype_header(markOopDesc::biased_locking_prototype()); | |
2017 } | |
2018 } | |
2019 | |
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2020 // Make a new system dictionary entry. |
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2021 Klass* sd_check = find_class(d_index, d_hash, name, loader_data); |
0 | 2022 if (sd_check == NULL) { |
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2023 dictionary()->add_klass(name, loader_data, k); |
0 | 2024 notice_modification(); |
2025 } | |
2026 #ifdef ASSERT | |
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2027 sd_check = find_class(d_index, d_hash, name, loader_data); |
0 | 2028 assert (sd_check != NULL, "should have entry in system dictionary"); |
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2029 // Note: there may be a placeholder entry: for circularity testing |
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2030 // or for parallel defines |
0 | 2031 #endif |
2032 SystemDictionary_lock->notify_all(); | |
2033 } | |
2034 } | |
2035 | |
2036 | |
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2037 // Try to find a class name using the loader constraints. The |
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2038 // loader constraints might know about a class that isn't fully loaded |
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2039 // yet and these will be ignored. |
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2040 Klass* SystemDictionary::find_constrained_instance_or_array_klass( |
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2041 Symbol* class_name, Handle class_loader, TRAPS) { |
0 | 2042 |
2043 // First see if it has been loaded directly. | |
2044 // Force the protection domain to be null. (This removes protection checks.) | |
2045 Handle no_protection_domain; | |
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2046 Klass* klass = find_instance_or_array_klass(class_name, class_loader, |
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2047 no_protection_domain, CHECK_NULL); |
0 | 2048 if (klass != NULL) |
2049 return klass; | |
2050 | |
2051 // Now look to see if it has been loaded elsewhere, and is subject to | |
2052 // a loader constraint that would require this loader to return the | |
2053 // klass that is already loaded. | |
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2054 if (FieldType::is_array(class_name)) { |
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2055 // For array classes, their Klass*s are not kept in the |
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2056 // constraint table. The element Klass*s are. |
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2057 FieldArrayInfo fd; |
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2058 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
0 | 2059 if (t != T_OBJECT) { |
2060 klass = Universe::typeArrayKlassObj(t); | |
2061 } else { | |
2062 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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2063 klass = constraints()->find_constrained_klass(fd.object_key(), class_loader); |
0 | 2064 } |
1336 | 2065 // If element class already loaded, allocate array klass |
0 | 2066 if (klass != NULL) { |
6983 | 2067 klass = klass->array_klass_or_null(fd.dimension()); |
0 | 2068 } |
2069 } else { | |
2070 MutexLocker mu(SystemDictionary_lock, THREAD); | |
2071 // Non-array classes are easy: simply check the constraint table. | |
2072 klass = constraints()->find_constrained_klass(class_name, class_loader); | |
2073 } | |
2074 | |
2075 return klass; | |
2076 } | |
2077 | |
2078 | |
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2079 bool SystemDictionary::add_loader_constraint(Symbol* class_name, |
0 | 2080 Handle class_loader1, |
2081 Handle class_loader2, | |
2082 Thread* THREAD) { | |
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2083 ClassLoaderData* loader_data1 = class_loader_data(class_loader1); |
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2084 ClassLoaderData* loader_data2 = class_loader_data(class_loader2); |
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2085 |
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2086 Symbol* constraint_name = NULL; |
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2087 if (!FieldType::is_array(class_name)) { |
1336 | 2088 constraint_name = class_name; |
2089 } else { | |
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2090 // For array classes, their Klass*s are not kept in the |
1336 | 2091 // constraint table. The element classes are. |
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2092 FieldArrayInfo fd; |
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2093 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(false)); |
1336 | 2094 // primitive types always pass |
2095 if (t != T_OBJECT) { | |
2096 return true; | |
2097 } else { | |
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2098 constraint_name = fd.object_key(); |
1336 | 2099 } |
2100 } | |
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2101 unsigned int d_hash1 = dictionary()->compute_hash(constraint_name, loader_data1); |
0 | 2102 int d_index1 = dictionary()->hash_to_index(d_hash1); |
2103 | |
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2104 unsigned int d_hash2 = dictionary()->compute_hash(constraint_name, loader_data2); |
0 | 2105 int d_index2 = dictionary()->hash_to_index(d_hash2); |
2106 { | |
1336 | 2107 MutexLocker mu_s(SystemDictionary_lock, THREAD); |
0 | 2108 |
1336 | 2109 // Better never do a GC while we're holding these oops |
2110 No_Safepoint_Verifier nosafepoint; | |
0 | 2111 |
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2112 Klass* klass1 = find_class(d_index1, d_hash1, constraint_name, loader_data1); |
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2113 Klass* klass2 = find_class(d_index2, d_hash2, constraint_name, loader_data2); |
1336 | 2114 return constraints()->add_entry(constraint_name, klass1, class_loader1, |
2115 klass2, class_loader2); | |
0 | 2116 } |
2117 } | |
2118 | |
2119 // Add entry to resolution error table to record the error when the first | |
2120 // attempt to resolve a reference to a class has failed. | |
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2121 void SystemDictionary::add_resolution_error(constantPoolHandle pool, int which, Symbol* error) { |
0 | 2122 unsigned int hash = resolution_errors()->compute_hash(pool, which); |
2123 int index = resolution_errors()->hash_to_index(hash); | |
2124 { | |
2125 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
2126 resolution_errors()->add_entry(index, hash, pool, which, error); | |
2127 } | |
2128 } | |
2129 | |
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2130 // Delete a resolution error for RedefineClasses for a constant pool is going away |
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2131 void SystemDictionary::delete_resolution_error(ConstantPool* pool) { |
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2132 resolution_errors()->delete_entry(pool); |
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2133 } |
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2134 |
0 | 2135 // Lookup resolution error table. Returns error if found, otherwise NULL. |
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2136 Symbol* SystemDictionary::find_resolution_error(constantPoolHandle pool, int which) { |
0 | 2137 unsigned int hash = resolution_errors()->compute_hash(pool, which); |
2138 int index = resolution_errors()->hash_to_index(hash); | |
2139 { | |
2140 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
2141 ResolutionErrorEntry* entry = resolution_errors()->find_entry(index, hash, pool, which); | |
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2142 return (entry != NULL) ? entry->error() : (Symbol*)NULL; |
0 | 2143 } |
2144 } | |
2145 | |
2146 | |
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2147 // Signature constraints ensure that callers and callees agree about |
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2148 // the meaning of type names in their signatures. This routine is the |
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2149 // intake for constraints. It collects them from several places: |
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2150 // |
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2151 // * LinkResolver::resolve_method (if check_access is true) requires |
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2152 // that the resolving class (the caller) and the defining class of |
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2153 // the resolved method (the callee) agree on each type in the |
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2154 // method's signature. |
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2155 // |
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2156 // * LinkResolver::resolve_interface_method performs exactly the same |
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2157 // checks. |
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2158 // |
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2159 // * LinkResolver::resolve_field requires that the constant pool |
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2160 // attempting to link to a field agree with the field's defining |
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2161 // class about the type of the field signature. |
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2162 // |
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2163 // * klassVtable::initialize_vtable requires that, when a class |
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2164 // overrides a vtable entry allocated by a superclass, that the |
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2165 // overriding method (i.e., the callee) agree with the superclass |
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2166 // on each type in the method's signature. |
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2167 // |
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2168 // * klassItable::initialize_itable requires that, when a class fills |
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2169 // in its itables, for each non-abstract method installed in an |
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2170 // itable, the method (i.e., the callee) agree with the interface |
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2171 // on each type in the method's signature. |
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2172 // |
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2173 // All those methods have a boolean (check_access, checkconstraints) |
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2174 // which turns off the checks. This is used from specialized contexts |
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2175 // such as bootstrapping, dumping, and debugging. |
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2176 // |
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2177 // No direct constraint is placed between the class and its |
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2178 // supertypes. Constraints are only placed along linked relations |
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2179 // between callers and callees. When a method overrides or implements |
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2180 // an abstract method in a supertype (superclass or interface), the |
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2181 // constraints are placed as if the supertype were the caller to the |
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2182 // overriding method. (This works well, since callers to the |
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2183 // supertype have already established agreement between themselves and |
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2184 // the supertype.) As a result of all this, a class can disagree with |
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2185 // its supertype about the meaning of a type name, as long as that |
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2186 // class neither calls a relevant method of the supertype, nor is |
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2187 // called (perhaps via an override) from the supertype. |
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2188 // |
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2189 // |
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2190 // SystemDictionary::check_signature_loaders(sig, l1, l2) |
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2191 // |
0 | 2192 // Make sure all class components (including arrays) in the given |
2193 // signature will be resolved to the same class in both loaders. | |
2194 // Returns the name of the type that failed a loader constraint check, or | |
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2195 // NULL if no constraint failed. No exception except OOME is thrown. |
1336 | 2196 // Arrays are not added to the loader constraint table, their elements are. |
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2197 Symbol* SystemDictionary::check_signature_loaders(Symbol* signature, |
0 | 2198 Handle loader1, Handle loader2, |
2199 bool is_method, TRAPS) { | |
2200 // Nothing to do if loaders are the same. | |
2201 if (loader1() == loader2()) { | |
2202 return NULL; | |
2203 } | |
2204 | |
2205 SignatureStream sig_strm(signature, is_method); | |
2206 while (!sig_strm.is_done()) { | |
2207 if (sig_strm.is_object()) { | |
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2208 Symbol* sig = sig_strm.as_symbol(CHECK_NULL); |
0 | 2209 if (!add_loader_constraint(sig, loader1, loader2, THREAD)) { |
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2210 return sig; |
0 | 2211 } |
2212 } | |
2213 sig_strm.next(); | |
2214 } | |
2215 return NULL; | |
2216 } | |
2217 | |
2218 | |
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2219 methodHandle SystemDictionary::find_method_handle_intrinsic(vmIntrinsics::ID iid, |
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2220 Symbol* signature, |
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2221 TRAPS) { |
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2222 methodHandle empty; |
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2223 assert(EnableInvokeDynamic, ""); |
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2224 assert(MethodHandles::is_signature_polymorphic(iid) && |
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2225 MethodHandles::is_signature_polymorphic_intrinsic(iid) && |
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2226 iid != vmIntrinsics::_invokeGeneric, |
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2227 err_msg("must be a known MH intrinsic iid=%d: %s", iid, vmIntrinsics::name_at(iid))); |
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2228 |
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2229 unsigned int hash = invoke_method_table()->compute_hash(signature, iid); |
710 | 2230 int index = invoke_method_table()->hash_to_index(hash); |
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2231 SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, iid); |
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2232 methodHandle m; |
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2233 if (spe == NULL || spe->method() == NULL) { |
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2234 spe = NULL; |
710 | 2235 // Must create lots of stuff here, but outside of the SystemDictionary lock. |
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2236 m = Method::make_method_handle_intrinsic(iid, signature, CHECK_(empty)); |
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2237 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_highest_tier, |
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2238 methodHandle(), CompileThreshold, "MH", CHECK_(empty)); |
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2239 |
710 | 2240 // Now grab the lock. We might have to throw away the new method, |
2241 // if a racing thread has managed to install one at the same time. | |
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2242 { |
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2243 MutexLocker ml(SystemDictionary_lock, THREAD); |
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2244 spe = invoke_method_table()->find_entry(index, hash, signature, iid); |
710 | 2245 if (spe == NULL) |
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2246 spe = invoke_method_table()->add_entry(index, hash, signature, iid); |
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2247 if (spe->method() == NULL) |
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2248 spe->set_method(m()); |
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2249 } |
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2250 } |
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2251 |
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2252 assert(spe != NULL && spe->method() != NULL, ""); |
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2253 return spe->method(); |
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2254 } |
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2255 |
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2256 // Helper for unpacking the return value from linkMethod and linkCallSite. |
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2257 static methodHandle unpack_method_and_appendix(Handle mname, |
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2258 KlassHandle accessing_klass, |
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2259 objArrayHandle appendix_box, |
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2260 Handle* appendix_result, |
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2261 TRAPS) { |
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2262 methodHandle empty; |
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2263 if (mname.not_null()) { |
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2264 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); |
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2265 if (vmtarget != NULL && vmtarget->is_method()) { |
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2266 Method* m = (Method*)vmtarget; |
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2267 oop appendix = appendix_box->obj_at(0); |
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2268 if (TraceMethodHandles) { |
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2269 #ifndef PRODUCT |
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2270 tty->print("Linked method=" INTPTR_FORMAT ": ", p2i(m)); |
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2271 m->print(); |
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2272 if (appendix != NULL) { tty->print("appendix = "); appendix->print(); } |
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2273 tty->cr(); |
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2274 #endif //PRODUCT |
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2275 } |
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2276 (*appendix_result) = Handle(THREAD, appendix); |
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2277 // the target is stored in the cpCache and if a reference to this |
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2278 // MethodName is dropped we need a way to make sure the |
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2279 // class_loader containing this method is kept alive. |
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2280 // FIXME: the appendix might also preserve this dependency. |
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2281 ClassLoaderData* this_key = InstanceKlass::cast(accessing_klass())->class_loader_data(); |
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2282 this_key->record_dependency(m->method_holder(), CHECK_NULL); // Can throw OOM |
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2283 return methodHandle(THREAD, m); |
710 | 2284 } |
2285 } | |
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2286 THROW_MSG_(vmSymbols::java_lang_LinkageError(), "bad value from MethodHandleNatives", empty); |
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2287 return empty; |
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2288 } |
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2289 |
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2290 methodHandle SystemDictionary::find_method_handle_invoker(Symbol* name, |
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2291 Symbol* signature, |
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2292 KlassHandle accessing_klass, |
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2293 Handle *appendix_result, |
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2294 Handle *method_type_result, |
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2295 TRAPS) { |
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2296 methodHandle empty; |
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2297 assert(EnableInvokeDynamic, ""); |
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2298 assert(!THREAD->is_Compiler_thread(), ""); |
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2299 Handle method_type = |
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2300 SystemDictionary::find_method_handle_type(signature, accessing_klass, CHECK_(empty)); |
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2301 if (false) { // FIXME: Decide if the Java upcall should resolve signatures. |
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2302 method_type = java_lang_String::create_from_symbol(signature, CHECK_(empty)); |
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2303 } |
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2304 |
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2305 KlassHandle mh_klass = SystemDictionary::MethodHandle_klass(); |
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2306 int ref_kind = JVM_REF_invokeVirtual; |
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2307 Handle name_str = StringTable::intern(name, CHECK_(empty)); |
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2308 objArrayHandle appendix_box = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1, CHECK_(empty)); |
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2309 assert(appendix_box->obj_at(0) == NULL, ""); |
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2310 |
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2311 // This should not happen. JDK code should take care of that. |
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2312 if (accessing_klass.is_null() || method_type.is_null()) { |
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2313 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad invokehandle", empty); |
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2314 } |
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2315 |
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2316 // call java.lang.invoke.MethodHandleNatives::linkMethod(... String, MethodType) -> MemberName |
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2317 JavaCallArguments args; |
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2318 args.push_oop(accessing_klass()->java_mirror()); |
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2319 args.push_int(ref_kind); |
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2320 args.push_oop(mh_klass()->java_mirror()); |
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2321 args.push_oop(name_str()); |
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2322 args.push_oop(method_type()); |
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2323 args.push_oop(appendix_box()); |
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2324 JavaValue result(T_OBJECT); |
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2325 JavaCalls::call_static(&result, |
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2326 SystemDictionary::MethodHandleNatives_klass(), |
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2327 vmSymbols::linkMethod_name(), |
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2328 vmSymbols::linkMethod_signature(), |
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2329 &args, CHECK_(empty)); |
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2330 Handle mname(THREAD, (oop) result.get_jobject()); |
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2331 (*method_type_result) = method_type; |
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2332 return unpack_method_and_appendix(mname, accessing_klass, appendix_box, appendix_result, THREAD); |
710 | 2333 } |
2334 | |
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2335 |
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2336 // Ask Java code to find or construct a java.lang.invoke.MethodType for the given |
710 | 2337 // signature, as interpreted relative to the given class loader. |
2338 // Because of class loader constraints, all method handle usage must be | |
2339 // consistent with this loader. | |
2177
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2340 Handle SystemDictionary::find_method_handle_type(Symbol* signature, |
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2341 KlassHandle accessing_klass, |
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2342 TRAPS) { |
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2343 Handle empty; |
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2344 vmIntrinsics::ID null_iid = vmIntrinsics::_none; // distinct from all method handle invoker intrinsics |
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2345 unsigned int hash = invoke_method_table()->compute_hash(signature, null_iid); |
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2346 int index = invoke_method_table()->hash_to_index(hash); |
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2347 SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, null_iid); |
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2348 if (spe != NULL && spe->method_type() != NULL) { |
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2349 assert(java_lang_invoke_MethodType::is_instance(spe->method_type()), ""); |
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2350 return Handle(THREAD, spe->method_type()); |
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2351 } else if (THREAD->is_Compiler_thread()) { |
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2352 warning("SystemDictionary::find_method_handle_type called from compiler thread"); // FIXME |
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2353 return Handle(); // do not attempt from within compiler, unless it was cached |
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2354 } |
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2355 |
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2356 Handle class_loader, protection_domain; |
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2357 bool is_on_bcp = true; // keep this true as long as we can materialize from the boot classloader |
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2358 int npts = ArgumentCount(signature).size(); |
1142 | 2359 objArrayHandle pts = oopFactory::new_objArray(SystemDictionary::Class_klass(), npts, CHECK_(empty)); |
710 | 2360 int arg = 0; |
2361 Handle rt; // the return type from the signature | |
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2362 ResourceMark rm(THREAD); |
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2363 for (SignatureStream ss(signature); !ss.is_done(); ss.next()) { |
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2364 oop mirror = NULL; |
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2365 if (is_on_bcp) { |
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2366 // Note: class_loader & protection_domain are both null at this point. |
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2367 mirror = ss.as_java_mirror(class_loader, protection_domain, |
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2368 SignatureStream::ReturnNull, CHECK_(empty)); |
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2369 if (mirror == NULL) { |
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|
2370 // fall back from BCP to accessing_klass |
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2371 if (accessing_klass.not_null()) { |
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2372 class_loader = Handle(THREAD, InstanceKlass::cast(accessing_klass())->class_loader()); |
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2373 protection_domain = Handle(THREAD, InstanceKlass::cast(accessing_klass())->protection_domain()); |
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2374 } |
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2375 is_on_bcp = false; |
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2376 } |
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2377 } |
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2378 if (!is_on_bcp) { |
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2379 // Resolve, throwing a real error if it doesn't work. |
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2380 mirror = ss.as_java_mirror(class_loader, protection_domain, |
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2381 SignatureStream::NCDFError, CHECK_(empty)); |
710 | 2382 } |
2383 if (ss.at_return_type()) | |
2384 rt = Handle(THREAD, mirror); | |
2385 else | |
2386 pts->obj_at_put(arg++, mirror); | |
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2387 |
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2388 // Check accessibility. |
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2389 if (ss.is_object() && accessing_klass.not_null()) { |
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2390 Klass* sel_klass = java_lang_Class::as_Klass(mirror); |
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2391 mirror = NULL; // safety |
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2392 // Emulate ConstantPool::verify_constant_pool_resolve. |
6983 | 2393 if (sel_klass->oop_is_objArray()) |
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2394 sel_klass = ObjArrayKlass::cast(sel_klass)->bottom_klass(); |
6983 | 2395 if (sel_klass->oop_is_instance()) { |
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2396 KlassHandle sel_kh(THREAD, sel_klass); |
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2397 LinkResolver::check_klass_accessability(accessing_klass, sel_kh, CHECK_(empty)); |
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2398 } |
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|
2399 } |
710 | 2400 } |
2401 assert(arg == npts, ""); | |
2402 | |
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2403 // call java.lang.invoke.MethodHandleNatives::findMethodType(Class rt, Class[] pts) -> MethodType |
710 | 2404 JavaCallArguments args(Handle(THREAD, rt())); |
2405 args.push_oop(pts()); | |
2406 JavaValue result(T_OBJECT); | |
2407 JavaCalls::call_static(&result, | |
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|
2408 SystemDictionary::MethodHandleNatives_klass(), |
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|
2409 vmSymbols::findMethodHandleType_name(), |
2460 | 2410 vmSymbols::findMethodHandleType_signature(), |
710 | 2411 &args, CHECK_(empty)); |
1793
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|
2412 Handle method_type(THREAD, (oop) result.get_jobject()); |
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|
2413 |
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2414 if (is_on_bcp) { |
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2415 // We can cache this MethodType inside the JVM. |
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2416 MutexLocker ml(SystemDictionary_lock, THREAD); |
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2417 spe = invoke_method_table()->find_entry(index, hash, signature, null_iid); |
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2418 if (spe == NULL) |
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2419 spe = invoke_method_table()->add_entry(index, hash, signature, null_iid); |
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2420 if (spe->method_type() == NULL) { |
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2421 spe->set_method_type(method_type()); |
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2422 } |
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|
2423 } |
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|
2424 |
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|
2425 // report back to the caller with the MethodType |
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|
2426 return method_type; |
710 | 2427 } |
2428 | |
1602 | 2429 // Ask Java code to find or construct a method handle constant. |
2430 Handle SystemDictionary::link_method_handle_constant(KlassHandle caller, | |
2431 int ref_kind, //e.g., JVM_REF_invokeVirtual | |
2432 KlassHandle callee, | |
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2433 Symbol* name_sym, |
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|
2434 Symbol* signature, |
1602 | 2435 TRAPS) { |
2436 Handle empty; | |
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|
2437 Handle name = java_lang_String::create_from_symbol(name_sym, CHECK_(empty)); |
1602 | 2438 Handle type; |
2439 if (signature->utf8_length() > 0 && signature->byte_at(0) == '(') { | |
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2440 type = find_method_handle_type(signature, caller, CHECK_(empty)); |
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2441 } else if (caller.is_null()) { |
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|
2442 // This should not happen. JDK code should take care of that. |
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|
2443 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MH constant", empty); |
1602 | 2444 } else { |
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|
2445 ResourceMark rm(THREAD); |
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|
2446 SignatureStream ss(signature, false); |
1602 | 2447 if (!ss.is_done()) { |
2448 oop mirror = ss.as_java_mirror(caller->class_loader(), caller->protection_domain(), | |
2449 SignatureStream::NCDFError, CHECK_(empty)); | |
2450 type = Handle(THREAD, mirror); | |
2451 ss.next(); | |
2452 if (!ss.is_done()) type = Handle(); // error! | |
2453 } | |
2454 } | |
2455 if (type.is_null()) { | |
2456 THROW_MSG_(vmSymbols::java_lang_LinkageError(), "bad signature", empty); | |
2457 } | |
2458 | |
2357
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2459 // call java.lang.invoke.MethodHandleNatives::linkMethodHandleConstant(Class caller, int refKind, Class callee, String name, Object type) -> MethodHandle |
1602 | 2460 JavaCallArguments args; |
2461 args.push_oop(caller->java_mirror()); // the referring class | |
2462 args.push_int(ref_kind); | |
2463 args.push_oop(callee->java_mirror()); // the target class | |
2464 args.push_oop(name()); | |
2465 args.push_oop(type()); | |
2466 JavaValue result(T_OBJECT); | |
2467 JavaCalls::call_static(&result, | |
2468 SystemDictionary::MethodHandleNatives_klass(), | |
2469 vmSymbols::linkMethodHandleConstant_name(), | |
2460 | 2470 vmSymbols::linkMethodHandleConstant_signature(), |
1602 | 2471 &args, CHECK_(empty)); |
2472 return Handle(THREAD, (oop) result.get_jobject()); | |
2473 } | |
710 | 2474 |
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2475 // Ask Java code to find or construct a java.lang.invoke.CallSite for the given |
726
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6655646: dynamic languages need dynamically linked call sites
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diff
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|
2476 // name and signature, as interpreted relative to the given class loader. |
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|
2477 methodHandle SystemDictionary::find_dynamic_call_site_invoker(KlassHandle caller, |
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2478 Handle bootstrap_specifier, |
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2479 Symbol* name, |
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2480 Symbol* type, |
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2481 Handle *appendix_result, |
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|
2482 Handle *method_type_result, |
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|
2483 TRAPS) { |
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|
2484 methodHandle empty; |
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|
2485 Handle bsm, info; |
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|
2486 if (java_lang_invoke_MethodHandle::is_instance(bootstrap_specifier())) { |
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|
2487 bsm = bootstrap_specifier; |
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|
2488 } else { |
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|
2489 assert(bootstrap_specifier->is_objArray(), ""); |
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2490 objArrayHandle args(THREAD, (objArrayOop) bootstrap_specifier()); |
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2491 int len = args->length(); |
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2492 assert(len >= 1, ""); |
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2493 bsm = Handle(THREAD, args->obj_at(0)); |
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2494 if (len > 1) { |
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2495 objArrayOop args1 = oopFactory::new_objArray(SystemDictionary::Object_klass(), len-1, CHECK_(empty)); |
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2496 for (int i = 1; i < len; i++) |
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2497 args1->obj_at_put(i-1, args->obj_at(i)); |
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2498 info = Handle(THREAD, args1); |
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2499 } |
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2500 } |
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2501 guarantee(java_lang_invoke_MethodHandle::is_instance(bsm()), |
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2502 "caller must supply a valid BSM"); |
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2503 |
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2504 Handle method_name = java_lang_String::create_from_symbol(name, CHECK_(empty)); |
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2505 Handle method_type = find_method_handle_type(type, caller, CHECK_(empty)); |
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2506 |
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2507 // This should not happen. JDK code should take care of that. |
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2508 if (caller.is_null() || method_type.is_null()) { |
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2509 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad invokedynamic", empty); |
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2510 } |
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2511 |
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2512 objArrayHandle appendix_box = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1, CHECK_(empty)); |
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2513 assert(appendix_box->obj_at(0) == NULL, ""); |
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2514 |
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2515 // call java.lang.invoke.MethodHandleNatives::linkCallSite(caller, bsm, name, mtype, info, &appendix) |
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2516 JavaCallArguments args; |
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2517 args.push_oop(caller->java_mirror()); |
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2518 args.push_oop(bsm()); |
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2519 args.push_oop(method_name()); |
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2520 args.push_oop(method_type()); |
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2521 args.push_oop(info()); |
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2522 args.push_oop(appendix_box); |
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2523 JavaValue result(T_OBJECT); |
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2524 JavaCalls::call_static(&result, |
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2525 SystemDictionary::MethodHandleNatives_klass(), |
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2526 vmSymbols::linkCallSite_name(), |
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2527 vmSymbols::linkCallSite_signature(), |
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2528 &args, CHECK_(empty)); |
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2529 Handle mname(THREAD, (oop) result.get_jobject()); |
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2530 (*method_type_result) = method_type; |
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2531 return unpack_method_and_appendix(mname, caller, appendix_box, appendix_result, THREAD); |
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2532 } |
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2533 |
0 | 2534 // Since the identity hash code for symbols changes when the symbols are |
2535 // moved from the regular perm gen (hash in the mark word) to the shared | |
2536 // spaces (hash is the address), the classes loaded into the dictionary | |
2537 // may be in the wrong buckets. | |
2538 | |
2539 void SystemDictionary::reorder_dictionary() { | |
2540 dictionary()->reorder_dictionary(); | |
2541 } | |
2542 | |
2543 | |
2544 void SystemDictionary::copy_buckets(char** top, char* end) { | |
2545 dictionary()->copy_buckets(top, end); | |
2546 } | |
2547 | |
2548 | |
2549 void SystemDictionary::copy_table(char** top, char* end) { | |
2550 dictionary()->copy_table(top, end); | |
2551 } | |
2552 | |
2553 | |
2554 void SystemDictionary::reverse() { | |
2555 dictionary()->reverse(); | |
2556 } | |
2557 | |
2558 int SystemDictionary::number_of_classes() { | |
2559 return dictionary()->number_of_entries(); | |
2560 } | |
2561 | |
2562 | |
2563 // ---------------------------------------------------------------------------- | |
2564 #ifndef PRODUCT | |
2565 | |
2566 void SystemDictionary::print() { | |
2567 dictionary()->print(); | |
2568 | |
2569 // Placeholders | |
2570 GCMutexLocker mu(SystemDictionary_lock); | |
2571 placeholders()->print(); | |
2572 | |
2573 // loader constraints - print under SD_lock | |
2574 constraints()->print(); | |
2575 } | |
2576 | |
2577 #endif | |
2578 | |
2579 void SystemDictionary::verify() { | |
2580 guarantee(dictionary() != NULL, "Verify of system dictionary failed"); | |
2581 guarantee(constraints() != NULL, | |
2582 "Verify of loader constraints failed"); | |
2583 guarantee(dictionary()->number_of_entries() >= 0 && | |
2584 placeholders()->number_of_entries() >= 0, | |
2585 "Verify of system dictionary failed"); | |
2586 | |
2587 // Verify dictionary | |
2588 dictionary()->verify(); | |
2589 | |
2590 GCMutexLocker mu(SystemDictionary_lock); | |
2591 placeholders()->verify(); | |
2592 | |
2593 // Verify constraint table | |
2594 guarantee(constraints() != NULL, "Verify of loader constraints failed"); | |
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2595 constraints()->verify(dictionary(), placeholders()); |
0 | 2596 } |
2597 | |
10405 | 2598 // utility function for class load event |
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2599 void SystemDictionary::post_class_load_event(const Ticks& start_time, |
10405 | 2600 instanceKlassHandle k, |
2601 Handle initiating_loader) { | |
2602 #if INCLUDE_TRACE | |
2603 EventClassLoad event(UNTIMED); | |
2604 if (event.should_commit()) { | |
2605 event.set_starttime(start_time); | |
2606 event.set_loadedClass(k()); | |
2607 oop defining_class_loader = k->class_loader(); | |
2608 event.set_definingClassLoader(defining_class_loader != NULL ? | |
2609 defining_class_loader->klass() : (Klass*)NULL); | |
2610 oop class_loader = initiating_loader.is_null() ? (oop)NULL : initiating_loader(); | |
2611 event.set_initiatingClassLoader(class_loader != NULL ? | |
2612 class_loader->klass() : (Klass*)NULL); | |
2613 event.commit(); | |
2614 } | |
2615 #endif /* INCLUDE_TRACE */ | |
2616 } | |
2617 | |
0 | 2618 #ifndef PRODUCT |
2619 | |
2620 // statistics code | |
2621 class ClassStatistics: AllStatic { | |
2622 private: | |
2623 static int nclasses; // number of classes | |
2624 static int nmethods; // number of methods | |
2625 static int nmethoddata; // number of methodData | |
2626 static int class_size; // size of class objects in words | |
2627 static int method_size; // size of method objects in words | |
2628 static int debug_size; // size of debug info in methods | |
2629 static int methoddata_size; // size of methodData objects in words | |
2630 | |
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2631 static void do_class(Klass* k) { |
0 | 2632 nclasses++; |
2633 class_size += k->size(); | |
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2634 if (k->oop_is_instance()) { |
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2635 InstanceKlass* ik = (InstanceKlass*)k; |
0 | 2636 class_size += ik->methods()->size(); |
2637 class_size += ik->constants()->size(); | |
2638 class_size += ik->local_interfaces()->size(); | |
2639 class_size += ik->transitive_interfaces()->size(); | |
2640 // We do not have to count implementors, since we only store one! | |
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2641 // SSS: How should these be accounted now that they have moved? |
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2642 // class_size += ik->fields()->length(); |
0 | 2643 } |
2644 } | |
2645 | |
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2646 static void do_method(Method* m) { |
0 | 2647 nmethods++; |
2648 method_size += m->size(); | |
2649 // class loader uses same objArray for empty vectors, so don't count these | |
2650 if (m->has_stackmap_table()) { | |
2651 method_size += m->stackmap_data()->size(); | |
2652 } | |
2653 | |
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2654 MethodData* mdo = m->method_data(); |
0 | 2655 if (mdo != NULL) { |
2656 nmethoddata++; | |
2657 methoddata_size += mdo->size(); | |
2658 } | |
2659 } | |
2660 | |
2661 public: | |
2662 static void print() { | |
2663 SystemDictionary::classes_do(do_class); | |
2664 SystemDictionary::methods_do(do_method); | |
2665 tty->print_cr("Class statistics:"); | |
2666 tty->print_cr("%d classes (%d bytes)", nclasses, class_size * oopSize); | |
2667 tty->print_cr("%d methods (%d bytes = %d base + %d debug info)", nmethods, | |
2668 (method_size + debug_size) * oopSize, method_size * oopSize, debug_size * oopSize); | |
2669 tty->print_cr("%d methoddata (%d bytes)", nmethoddata, methoddata_size * oopSize); | |
2670 } | |
2671 }; | |
2672 | |
2673 | |
2674 int ClassStatistics::nclasses = 0; | |
2675 int ClassStatistics::nmethods = 0; | |
2676 int ClassStatistics::nmethoddata = 0; | |
2677 int ClassStatistics::class_size = 0; | |
2678 int ClassStatistics::method_size = 0; | |
2679 int ClassStatistics::debug_size = 0; | |
2680 int ClassStatistics::methoddata_size = 0; | |
2681 | |
2682 void SystemDictionary::print_class_statistics() { | |
2683 ResourceMark rm; | |
2684 ClassStatistics::print(); | |
2685 } | |
2686 | |
2687 | |
2688 class MethodStatistics: AllStatic { | |
2689 public: | |
2690 enum { | |
2691 max_parameter_size = 10 | |
2692 }; | |
2693 private: | |
2694 | |
2695 static int _number_of_methods; | |
2696 static int _number_of_final_methods; | |
2697 static int _number_of_static_methods; | |
2698 static int _number_of_native_methods; | |
2699 static int _number_of_synchronized_methods; | |
2700 static int _number_of_profiled_methods; | |
2701 static int _number_of_bytecodes; | |
2702 static int _parameter_size_profile[max_parameter_size]; | |
2703 static int _bytecodes_profile[Bytecodes::number_of_java_codes]; | |
2704 | |
2705 static void initialize() { | |
2706 _number_of_methods = 0; | |
2707 _number_of_final_methods = 0; | |
2708 _number_of_static_methods = 0; | |
2709 _number_of_native_methods = 0; | |
2710 _number_of_synchronized_methods = 0; | |
2711 _number_of_profiled_methods = 0; | |
2712 _number_of_bytecodes = 0; | |
2713 for (int i = 0; i < max_parameter_size ; i++) _parameter_size_profile[i] = 0; | |
2714 for (int j = 0; j < Bytecodes::number_of_java_codes; j++) _bytecodes_profile [j] = 0; | |
2715 }; | |
2716 | |
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2717 static void do_method(Method* m) { |
0 | 2718 _number_of_methods++; |
2719 // collect flag info | |
2720 if (m->is_final() ) _number_of_final_methods++; | |
2721 if (m->is_static() ) _number_of_static_methods++; | |
2722 if (m->is_native() ) _number_of_native_methods++; | |
2723 if (m->is_synchronized()) _number_of_synchronized_methods++; | |
2724 if (m->method_data() != NULL) _number_of_profiled_methods++; | |
2725 // collect parameter size info (add one for receiver, if any) | |
2726 _parameter_size_profile[MIN2(m->size_of_parameters() + (m->is_static() ? 0 : 1), max_parameter_size - 1)]++; | |
2727 // collect bytecodes info | |
2728 { | |
2729 Thread *thread = Thread::current(); | |
2730 HandleMark hm(thread); | |
2731 BytecodeStream s(methodHandle(thread, m)); | |
2732 Bytecodes::Code c; | |
2733 while ((c = s.next()) >= 0) { | |
2734 _number_of_bytecodes++; | |
2735 _bytecodes_profile[c]++; | |
2736 } | |
2737 } | |
2738 } | |
2739 | |
2740 public: | |
2741 static void print() { | |
2742 initialize(); | |
2743 SystemDictionary::methods_do(do_method); | |
2744 // generate output | |
2745 tty->cr(); | |
2746 tty->print_cr("Method statistics (static):"); | |
2747 // flag distribution | |
2748 tty->cr(); | |
2749 tty->print_cr("%6d final methods %6.1f%%", _number_of_final_methods , _number_of_final_methods * 100.0F / _number_of_methods); | |
2750 tty->print_cr("%6d static methods %6.1f%%", _number_of_static_methods , _number_of_static_methods * 100.0F / _number_of_methods); | |
2751 tty->print_cr("%6d native methods %6.1f%%", _number_of_native_methods , _number_of_native_methods * 100.0F / _number_of_methods); | |
2752 tty->print_cr("%6d synchronized methods %6.1f%%", _number_of_synchronized_methods, _number_of_synchronized_methods * 100.0F / _number_of_methods); | |
2753 tty->print_cr("%6d profiled methods %6.1f%%", _number_of_profiled_methods, _number_of_profiled_methods * 100.0F / _number_of_methods); | |
2754 // parameter size profile | |
2755 tty->cr(); | |
2756 { int tot = 0; | |
2757 int avg = 0; | |
2758 for (int i = 0; i < max_parameter_size; i++) { | |
2759 int n = _parameter_size_profile[i]; | |
2760 tot += n; | |
2761 avg += n*i; | |
2762 tty->print_cr("parameter size = %1d: %6d methods %5.1f%%", i, n, n * 100.0F / _number_of_methods); | |
2763 } | |
2764 assert(tot == _number_of_methods, "should be the same"); | |
2765 tty->print_cr(" %6d methods 100.0%%", _number_of_methods); | |
2766 tty->print_cr("(average parameter size = %3.1f including receiver, if any)", (float)avg / _number_of_methods); | |
2767 } | |
2768 // bytecodes profile | |
2769 tty->cr(); | |
2770 { int tot = 0; | |
2771 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) { | |
2772 if (Bytecodes::is_defined(i)) { | |
2773 Bytecodes::Code c = Bytecodes::cast(i); | |
2774 int n = _bytecodes_profile[c]; | |
2775 tot += n; | |
2776 tty->print_cr("%9d %7.3f%% %s", n, n * 100.0F / _number_of_bytecodes, Bytecodes::name(c)); | |
2777 } | |
2778 } | |
2779 assert(tot == _number_of_bytecodes, "should be the same"); | |
2780 tty->print_cr("%9d 100.000%%", _number_of_bytecodes); | |
2781 } | |
2782 tty->cr(); | |
2783 } | |
2784 }; | |
2785 | |
2786 int MethodStatistics::_number_of_methods; | |
2787 int MethodStatistics::_number_of_final_methods; | |
2788 int MethodStatistics::_number_of_static_methods; | |
2789 int MethodStatistics::_number_of_native_methods; | |
2790 int MethodStatistics::_number_of_synchronized_methods; | |
2791 int MethodStatistics::_number_of_profiled_methods; | |
2792 int MethodStatistics::_number_of_bytecodes; | |
2793 int MethodStatistics::_parameter_size_profile[MethodStatistics::max_parameter_size]; | |
2794 int MethodStatistics::_bytecodes_profile[Bytecodes::number_of_java_codes]; | |
2795 | |
2796 | |
2797 void SystemDictionary::print_method_statistics() { | |
2798 MethodStatistics::print(); | |
2799 } | |
2800 | |
2801 #endif // PRODUCT |