Mercurial > hg > truffle
annotate src/share/vm/classfile/systemDictionary.cpp @ 11722:ff05c78a7f64
use time passed to decide what methods to compile or inline
author | Christian Wirth <christian.wirth@oracle.com> |
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date | Thu, 19 Sep 2013 10:36:56 +0200 |
parents | 836a62f43af9 |
children | 096c224171c4 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
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26 #include "classfile/classLoaderData.inline.hpp" |
1972 | 27 #include "classfile/dictionary.hpp" |
28 #include "classfile/javaClasses.hpp" | |
29 #include "classfile/loaderConstraints.hpp" | |
30 #include "classfile/placeholders.hpp" | |
31 #include "classfile/resolutionErrors.hpp" | |
32 #include "classfile/systemDictionary.hpp" | |
33 #include "classfile/vmSymbols.hpp" | |
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34 #include "compiler/compileBroker.hpp" |
1972 | 35 #include "interpreter/bytecodeStream.hpp" |
36 #include "interpreter/interpreter.hpp" | |
37 #include "memory/gcLocker.hpp" | |
38 #include "memory/oopFactory.hpp" | |
39 #include "oops/instanceKlass.hpp" | |
40 #include "oops/instanceRefKlass.hpp" | |
41 #include "oops/klass.inline.hpp" | |
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42 #include "oops/methodData.hpp" |
1972 | 43 #include "oops/objArrayKlass.hpp" |
44 #include "oops/oop.inline.hpp" | |
45 #include "oops/oop.inline2.hpp" | |
46 #include "oops/typeArrayKlass.hpp" | |
47 #include "prims/jvmtiEnvBase.hpp" | |
48 #include "prims/methodHandles.hpp" | |
49 #include "runtime/biasedLocking.hpp" | |
50 #include "runtime/fieldType.hpp" | |
51 #include "runtime/handles.inline.hpp" | |
52 #include "runtime/java.hpp" | |
53 #include "runtime/javaCalls.hpp" | |
54 #include "runtime/mutexLocker.hpp" | |
55 #include "runtime/signature.hpp" | |
56 #include "services/classLoadingService.hpp" | |
57 #include "services/threadService.hpp" | |
0 | 58 |
10405 | 59 #if INCLUDE_TRACE |
60 #include "trace/tracing.hpp" | |
61 #include "trace/traceMacros.hpp" | |
62 #endif | |
63 | |
0 | 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 |
10405 | 601 TracingTime class_load_start_time = Tracing::time(); |
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 (HAS_PENDING_EXCEPTION) { |
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830 // An exception, such as OOM could have happened at various places inside |
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831 // load_instance_class. We might have partially initialized a shared class |
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832 // and need to clean it up. |
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833 if (class_loader.is_null()) { |
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834 // In some cases k may be null. Let's find the shared class again. |
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835 instanceKlassHandle ik(THREAD, find_shared_class(name)); |
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836 if (ik.not_null()) { |
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837 if (ik->class_loader_data() == NULL) { |
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838 // We didn't go as far as Klass::restore_unshareable_info(), |
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839 // so nothing to clean up. |
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840 } else { |
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841 Klass *kk; |
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842 { |
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843 MutexLocker mu(SystemDictionary_lock, THREAD); |
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844 kk = find_class(d_index, d_hash, name, ik->class_loader_data()); |
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845 } |
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846 if (kk != NULL) { |
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847 // No clean up is needed if the shared class has been entered |
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848 // into system dictionary, as load_shared_class() won't be called |
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849 // again. |
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850 } else { |
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851 // This must be done outside of the SystemDictionary_lock to |
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852 // avoid deadlock. |
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853 // |
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854 // Note that Klass::restore_unshareable_info (called via |
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855 // load_instance_class above) is also called outside |
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856 // of SystemDictionary_lock. Other threads are blocked from |
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857 // loading this class because they are waiting on the |
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858 // SystemDictionary_lock until this thread removes |
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859 // the placeholder below. |
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860 // |
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861 // This need to be re-thought when parallel-capable non-boot |
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862 // classloaders are supported by CDS (today they're not). |
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863 clean_up_shared_class(ik, class_loader, THREAD); |
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864 } |
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865 } |
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866 } |
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867 } |
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868 } |
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869 |
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870 if (load_instance_added == true) { |
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871 // clean up placeholder entries for LOAD_INSTANCE success or error |
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872 // This brackets the SystemDictionary updates for both defining |
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873 // and initiating loaders |
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874 MutexLocker mu(SystemDictionary_lock, THREAD); |
10405 | 875 placeholders()->find_and_remove(p_index, p_hash, name, loader_data, PlaceholderTable::LOAD_INSTANCE, THREAD); |
876 SystemDictionary_lock->notify_all(); | |
0 | 877 } |
878 } | |
879 | |
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880 if (HAS_PENDING_EXCEPTION || k.is_null()) { |
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881 return NULL; |
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882 } |
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883 |
10405 | 884 post_class_load_event(class_load_start_time, k, class_loader); |
885 | |
0 | 886 #ifdef ASSERT |
887 { | |
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888 ClassLoaderData* loader_data = k->class_loader_data(); |
0 | 889 MutexLocker mu(SystemDictionary_lock, THREAD); |
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890 Klass* kk = find_class(name, loader_data); |
0 | 891 assert(kk == k(), "should be present in dictionary"); |
892 } | |
893 #endif | |
894 | |
895 // return if the protection domain in NULL | |
896 if (protection_domain() == NULL) return k(); | |
897 | |
898 // Check the protection domain has the right access | |
899 { | |
900 MutexLocker mu(SystemDictionary_lock, THREAD); | |
901 // Note that we have an entry, and entries can be deleted only during GC, | |
902 // so we cannot allow GC to occur while we're holding this entry. | |
903 // We're using a No_Safepoint_Verifier to catch any place where we | |
904 // might potentially do a GC at all. | |
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905 // Dictionary::do_unloading() asserts that classes in SD are only |
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906 // unloaded at a safepoint. Anonymous classes are not in SD. |
0 | 907 No_Safepoint_Verifier nosafepoint; |
908 if (dictionary()->is_valid_protection_domain(d_index, d_hash, name, | |
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909 loader_data, |
0 | 910 protection_domain)) { |
911 return k(); | |
912 } | |
913 } | |
914 | |
915 // Verify protection domain. If it fails an exception is thrown | |
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916 validate_protection_domain(k, class_loader, protection_domain, CHECK_NULL); |
0 | 917 |
918 return k(); | |
919 } | |
920 | |
921 | |
922 // This routine does not lock the system dictionary. | |
923 // | |
924 // Since readers don't hold a lock, we must make sure that system | |
925 // dictionary entries are only removed at a safepoint (when only one | |
926 // thread is running), and are added to in a safe way (all links must | |
927 // be updated in an MT-safe manner). | |
928 // | |
929 // Callers should be aware that an entry could be added just after | |
930 // _dictionary->bucket(index) is read here, so the caller will not see | |
931 // the new entry. | |
932 | |
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933 Klass* SystemDictionary::find(Symbol* class_name, |
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934 Handle class_loader, |
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935 Handle protection_domain, |
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936 TRAPS) { |
0 | 937 |
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938 // UseNewReflection |
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939 // The result of this call should be consistent with the result |
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940 // of the call to resolve_instance_class_or_null(). |
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941 // See evaluation 6790209 and 4474172 for more details. |
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942 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); |
8667
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943 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data_or_null(class_loader()); |
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944 |
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945 if (loader_data == NULL) { |
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946 // If the ClassLoaderData has not been setup, |
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947 // then the class loader has no entries in the dictionary. |
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948 return NULL; |
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949 } |
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950 |
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951 unsigned int d_hash = dictionary()->compute_hash(class_name, loader_data); |
0 | 952 int d_index = dictionary()->hash_to_index(d_hash); |
953 | |
954 { | |
955 // Note that we have an entry, and entries can be deleted only during GC, | |
956 // so we cannot allow GC to occur while we're holding this entry. | |
957 // We're using a No_Safepoint_Verifier to catch any place where we | |
958 // might potentially do a GC at all. | |
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959 // Dictionary::do_unloading() asserts that classes in SD are only |
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960 // unloaded at a safepoint. Anonymous classes are not in SD. |
0 | 961 No_Safepoint_Verifier nosafepoint; |
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962 return dictionary()->find(d_index, d_hash, class_name, loader_data, |
0 | 963 protection_domain, THREAD); |
964 } | |
965 } | |
966 | |
967 | |
968 // Look for a loaded instance or array klass by name. Do not do any loading. | |
969 // return NULL in case of error. | |
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970 Klass* SystemDictionary::find_instance_or_array_klass(Symbol* class_name, |
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971 Handle class_loader, |
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972 Handle protection_domain, |
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973 TRAPS) { |
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974 Klass* k = NULL; |
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975 assert(class_name != NULL, "class name must be non NULL"); |
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976 |
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977 if (FieldType::is_array(class_name)) { |
0 | 978 // The name refers to an array. Parse the name. |
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979 // dimension and object_key in FieldArrayInfo are assigned as a |
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980 // side-effect of this call |
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981 FieldArrayInfo fd; |
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982 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
0 | 983 if (t != T_OBJECT) { |
984 k = Universe::typeArrayKlassObj(t); | |
985 } else { | |
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986 k = SystemDictionary::find(fd.object_key(), class_loader, protection_domain, THREAD); |
0 | 987 } |
988 if (k != NULL) { | |
6983 | 989 k = k->array_klass_or_null(fd.dimension()); |
0 | 990 } |
991 } else { | |
992 k = find(class_name, class_loader, protection_domain, THREAD); | |
993 } | |
994 return k; | |
995 } | |
996 | |
997 // Note: this method is much like resolve_from_stream, but | |
998 // updates no supplemental data structures. | |
999 // TODO consolidate the two methods with a helper routine? | |
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1000 Klass* SystemDictionary::parse_stream(Symbol* class_name, |
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1001 Handle class_loader, |
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1002 Handle protection_domain, |
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1003 ClassFileStream* st, |
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1004 KlassHandle host_klass, |
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1005 GrowableArray<Handle>* cp_patches, |
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1006 TRAPS) { |
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1007 TempNewSymbol parsed_name = NULL; |
0 | 1008 |
10405 | 1009 TracingTime class_load_start_time = Tracing::time(); |
1010 | |
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1011 ClassLoaderData* loader_data; |
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1012 if (host_klass.not_null()) { |
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1013 // Create a new CLD for anonymous class, that uses the same class loader |
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1014 // as the host_klass |
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1015 assert(EnableInvokeDynamic, ""); |
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1016 guarantee(host_klass->class_loader() == class_loader(), "should be the same"); |
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1017 loader_data = ClassLoaderData::anonymous_class_loader_data(class_loader(), CHECK_NULL); |
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1018 loader_data->record_dependency(host_klass(), CHECK_NULL); |
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1019 } else { |
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1020 loader_data = ClassLoaderData::class_loader_data(class_loader()); |
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1021 } |
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1022 |
0 | 1023 // Parse the stream. Note that we do this even though this klass might |
1024 // already be present in the SystemDictionary, otherwise we would not | |
1025 // throw potential ClassFormatErrors. | |
1026 // | |
1027 // Note: "name" is updated. | |
1028 | |
1029 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
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1030 loader_data, |
0 | 1031 protection_domain, |
710 | 1032 host_klass, |
1033 cp_patches, | |
0 | 1034 parsed_name, |
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1035 true, |
0 | 1036 THREAD); |
1037 | |
1038 | |
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1039 if (host_klass.not_null() && k.not_null()) { |
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1040 assert(EnableInvokeDynamic, ""); |
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1041 k->set_host_klass(host_klass()); |
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1042 // If it's anonymous, initialize it now, since nobody else will. |
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1043 |
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1044 { |
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1045 MutexLocker mu_r(Compile_lock, THREAD); |
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1046 |
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1047 // Add to class hierarchy, initialize vtables, and do possible |
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1048 // deoptimizations. |
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1049 add_to_hierarchy(k, CHECK_NULL); // No exception, but can block |
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1050 |
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1051 // But, do not add to system dictionary. |
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1052 } |
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1053 |
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1054 // Rewrite and patch constant pool here. |
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1055 k->link_class(CHECK_NULL); |
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1056 if (cp_patches != NULL) { |
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1057 k->constants()->patch_resolved_references(cp_patches); |
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1058 } |
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1059 k->eager_initialize(CHECK_NULL); |
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1060 |
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1061 // notify jvmti |
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1062 if (JvmtiExport::should_post_class_load()) { |
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1063 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); |
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1064 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); |
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1065 } |
10405 | 1066 |
1067 post_class_load_event(class_load_start_time, k, class_loader); | |
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1068 } |
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1069 assert(host_klass.not_null() || cp_patches == NULL, |
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1070 "cp_patches only found with host_klass"); |
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1071 |
0 | 1072 return k(); |
1073 } | |
1074 | |
1075 // Add a klass to the system from a stream (called by jni_DefineClass and | |
1076 // JVM_DefineClass). | |
1077 // Note: class_name can be NULL. In that case we do not know the name of | |
1078 // the class until we have parsed the stream. | |
1079 | |
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1080 Klass* SystemDictionary::resolve_from_stream(Symbol* class_name, |
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1081 Handle class_loader, |
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1082 Handle protection_domain, |
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1083 ClassFileStream* st, |
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1084 bool verify, |
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1085 TRAPS) { |
0 | 1086 |
514 | 1087 // Classloaders that support parallelism, e.g. bootstrap classloader, |
1088 // or all classloaders with UnsyncloadClass do not acquire lock here | |
1089 bool DoObjectLock = true; | |
1090 if (is_parallelCapable(class_loader)) { | |
1091 DoObjectLock = false; | |
1092 } | |
1093 | |
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1094 ClassLoaderData* loader_data = register_loader(class_loader, CHECK_NULL); |
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1095 |
514 | 1096 // Make sure we are synchronized on the class loader before we proceed |
0 | 1097 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); |
1098 check_loader_lock_contention(lockObject, THREAD); | |
514 | 1099 ObjectLocker ol(lockObject, THREAD, DoObjectLock); |
0 | 1100 |
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1101 TempNewSymbol parsed_name = NULL; |
0 | 1102 |
1103 // Parse the stream. Note that we do this even though this klass might | |
1104 // already be present in the SystemDictionary, otherwise we would not | |
1105 // throw potential ClassFormatErrors. | |
1106 // | |
1107 // Note: "name" is updated. | |
1108 | |
1109 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
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1110 loader_data, |
0 | 1111 protection_domain, |
1112 parsed_name, | |
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1113 verify, |
0 | 1114 THREAD); |
1115 | |
1116 const char* pkg = "java/"; | |
1117 if (!HAS_PENDING_EXCEPTION && | |
1118 !class_loader.is_null() && | |
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1119 parsed_name != NULL && |
0 | 1120 !strncmp((const char*)parsed_name->bytes(), pkg, strlen(pkg))) { |
1121 // It is illegal to define classes in the "java." package from | |
1122 // JVM_DefineClass or jni_DefineClass unless you're the bootclassloader | |
1123 ResourceMark rm(THREAD); | |
1124 char* name = parsed_name->as_C_string(); | |
1125 char* index = strrchr(name, '/'); | |
1126 *index = '\0'; // chop to just the package name | |
1127 while ((index = strchr(name, '/')) != NULL) { | |
1128 *index = '.'; // replace '/' with '.' in package name | |
1129 } | |
1130 const char* fmt = "Prohibited package name: %s"; | |
1131 size_t len = strlen(fmt) + strlen(name); | |
1132 char* message = NEW_RESOURCE_ARRAY(char, len); | |
1133 jio_snprintf(message, len, fmt, name); | |
1134 Exceptions::_throw_msg(THREAD_AND_LOCATION, | |
1135 vmSymbols::java_lang_SecurityException(), message); | |
1136 } | |
1137 | |
1138 if (!HAS_PENDING_EXCEPTION) { | |
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1139 assert(parsed_name != NULL, "Sanity"); |
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1140 assert(class_name == NULL || class_name == parsed_name, "name mismatch"); |
0 | 1141 // Verification prevents us from creating names with dots in them, this |
1142 // asserts that that's the case. | |
1143 assert(is_internal_format(parsed_name), | |
1144 "external class name format used internally"); | |
1145 | |
1146 // Add class just loaded | |
514 | 1147 // If a class loader supports parallel classloading handle parallel define requests |
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1148 // find_or_define_instance_class may return a different InstanceKlass |
514 | 1149 if (is_parallelCapable(class_loader)) { |
1150 k = find_or_define_instance_class(class_name, class_loader, k, THREAD); | |
1151 } else { | |
1152 define_instance_class(k, THREAD); | |
1153 } | |
0 | 1154 } |
1155 | |
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1156 // Make sure we have an entry in the SystemDictionary on success |
0 | 1157 debug_only( { |
1158 if (!HAS_PENDING_EXCEPTION) { | |
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1159 assert(parsed_name != NULL, "parsed_name is still null?"); |
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1160 Symbol* h_name = k->name(); |
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1161 ClassLoaderData *defining_loader_data = k->class_loader_data(); |
0 | 1162 |
1163 MutexLocker mu(SystemDictionary_lock, THREAD); | |
1164 | |
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1165 Klass* check = find_class(parsed_name, loader_data); |
0 | 1166 assert(check == k(), "should be present in the dictionary"); |
1167 | |
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1168 Klass* check2 = find_class(h_name, defining_loader_data); |
0 | 1169 assert(check == check2, "name inconsistancy in SystemDictionary"); |
1170 } | |
1171 } ); | |
1172 | |
1173 return k(); | |
1174 } | |
1175 | |
1176 | |
6197 | 1177 void SystemDictionary::set_shared_dictionary(HashtableBucket<mtClass>* t, int length, |
0 | 1178 int number_of_entries) { |
6197 | 1179 assert(length == _nof_buckets * sizeof(HashtableBucket<mtClass>), |
0 | 1180 "bad shared dictionary size."); |
1181 _shared_dictionary = new Dictionary(_nof_buckets, t, number_of_entries); | |
1182 } | |
1183 | |
1184 | |
1185 // If there is a shared dictionary, then find the entry for the | |
1186 // given shared system class, if any. | |
1187 | |
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1188 Klass* SystemDictionary::find_shared_class(Symbol* class_name) { |
0 | 1189 if (shared_dictionary() != NULL) { |
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1190 unsigned int d_hash = shared_dictionary()->compute_hash(class_name, NULL); |
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1191 int d_index = shared_dictionary()->hash_to_index(d_hash); |
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1192 |
0 | 1193 return shared_dictionary()->find_shared_class(d_index, d_hash, class_name); |
1194 } else { | |
1195 return NULL; | |
1196 } | |
1197 } | |
1198 | |
1199 | |
1200 // Load a class from the shared spaces (found through the shared system | |
1201 // dictionary). Force the superclass and all interfaces to be loaded. | |
1202 // Update the class definition to include sibling classes and no | |
1203 // subclasses (yet). [Classes in the shared space are not part of the | |
1204 // object hierarchy until loaded.] | |
1205 | |
1206 instanceKlassHandle SystemDictionary::load_shared_class( | |
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1207 Symbol* class_name, Handle class_loader, TRAPS) { |
0 | 1208 instanceKlassHandle ik (THREAD, find_shared_class(class_name)); |
1209 return load_shared_class(ik, class_loader, THREAD); | |
1210 } | |
1211 | |
1212 instanceKlassHandle SystemDictionary::load_shared_class( | |
1213 instanceKlassHandle ik, Handle class_loader, TRAPS) { | |
1214 assert(class_loader.is_null(), "non-null classloader for shared class?"); | |
1215 if (ik.not_null()) { | |
1216 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1217 Symbol* class_name = ik->name(); |
0 | 1218 |
1219 // Found the class, now load the superclass and interfaces. If they | |
1220 // are shared, add them to the main system dictionary and reset | |
1221 // their hierarchy references (supers, subs, and interfaces). | |
1222 | |
1223 if (ik->super() != NULL) { | |
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1224 Symbol* cn = ik->super()->name(); |
0 | 1225 resolve_super_or_fail(class_name, cn, |
1226 class_loader, Handle(), true, CHECK_(nh)); | |
1227 } | |
1228 | |
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1229 Array<Klass*>* interfaces = ik->local_interfaces(); |
0 | 1230 int num_interfaces = interfaces->length(); |
1231 for (int index = 0; index < num_interfaces; index++) { | |
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1232 Klass* k = interfaces->at(index); |
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1233 |
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1234 // Note: can not use InstanceKlass::cast here because |
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1235 // interfaces' InstanceKlass's C++ vtbls haven't been |
0 | 1236 // reinitialized yet (they will be once the interface classes |
1237 // are loaded) | |
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1238 Symbol* name = k->name(); |
0 | 1239 resolve_super_or_fail(class_name, name, class_loader, Handle(), false, CHECK_(nh)); |
1240 } | |
1241 | |
1242 // Adjust methods to recover missing data. They need addresses for | |
1243 // interpreter entry points and their default native method address | |
1244 // must be reset. | |
1245 | |
1246 // Updating methods must be done under a lock so multiple | |
1247 // threads don't update these in parallel | |
1248 // Shared classes are all currently loaded by the bootstrap | |
1249 // classloader, so this will never cause a deadlock on | |
1250 // a custom class loader lock. | |
1251 | |
1252 { | |
1253 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
1254 check_loader_lock_contention(lockObject, THREAD); | |
1255 ObjectLocker ol(lockObject, THREAD, true); | |
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1256 ik->restore_unshareable_info(CHECK_(nh)); |
0 | 1257 } |
1258 | |
1259 if (TraceClassLoading) { | |
1260 ResourceMark rm; | |
1261 tty->print("[Loaded %s", ik->external_name()); | |
1262 tty->print(" from shared objects file"); | |
1263 tty->print_cr("]"); | |
1264 } | |
1265 // notify a class loaded from shared object | |
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1266 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(ik()), |
0 | 1267 true /* shared class */); |
1268 } | |
1269 return ik; | |
1270 } | |
1271 | |
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1272 void SystemDictionary::clean_up_shared_class(instanceKlassHandle ik, Handle class_loader, TRAPS) { |
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1273 // Updating methods must be done under a lock so multiple |
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1274 // threads don't update these in parallel |
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1275 // Shared classes are all currently loaded by the bootstrap |
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1276 // classloader, so this will never cause a deadlock on |
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1277 // a custom class loader lock. |
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1278 { |
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1279 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); |
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1280 check_loader_lock_contention(lockObject, THREAD); |
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1281 ObjectLocker ol(lockObject, THREAD, true); |
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1282 ik->remove_unshareable_info(); |
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1283 } |
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1284 } |
0 | 1285 |
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1286 instanceKlassHandle SystemDictionary::load_instance_class(Symbol* class_name, Handle class_loader, TRAPS) { |
0 | 1287 instanceKlassHandle nh = instanceKlassHandle(); // null Handle |
1288 if (class_loader.is_null()) { | |
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1289 |
0 | 1290 // Search the shared system dictionary for classes preloaded into the |
1291 // shared spaces. | |
1292 instanceKlassHandle k; | |
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1293 { |
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1294 PerfTraceTime vmtimer(ClassLoader::perf_shared_classload_time()); |
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1295 k = load_shared_class(class_name, class_loader, THREAD); |
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1296 } |
0 | 1297 |
1298 if (k.is_null()) { | |
1299 // Use VM class loader | |
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1300 PerfTraceTime vmtimer(ClassLoader::perf_sys_classload_time()); |
0 | 1301 k = ClassLoader::load_classfile(class_name, CHECK_(nh)); |
1302 } | |
1303 | |
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1304 // find_or_define_instance_class may return a different InstanceKlass |
0 | 1305 if (!k.is_null()) { |
1306 k = find_or_define_instance_class(class_name, class_loader, k, CHECK_(nh)); | |
1307 } | |
1308 return k; | |
1309 } else { | |
1310 // Use user specified class loader to load class. Call loadClass operation on class_loader. | |
1311 ResourceMark rm(THREAD); | |
1312 | |
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1313 assert(THREAD->is_Java_thread(), "must be a JavaThread"); |
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1314 JavaThread* jt = (JavaThread*) THREAD; |
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1315 |
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1316 PerfClassTraceTime vmtimer(ClassLoader::perf_app_classload_time(), |
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1317 ClassLoader::perf_app_classload_selftime(), |
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1318 ClassLoader::perf_app_classload_count(), |
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1319 jt->get_thread_stat()->perf_recursion_counts_addr(), |
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1320 jt->get_thread_stat()->perf_timers_addr(), |
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1321 PerfClassTraceTime::CLASS_LOAD); |
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1322 |
0 | 1323 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nh)); |
1324 // Translate to external class name format, i.e., convert '/' chars to '.' | |
1325 Handle string = java_lang_String::externalize_classname(s, CHECK_(nh)); | |
1326 | |
1327 JavaValue result(T_OBJECT); | |
1328 | |
1142 | 1329 KlassHandle spec_klass (THREAD, SystemDictionary::ClassLoader_klass()); |
0 | 1330 |
514 | 1331 // Call public unsynchronized loadClass(String) directly for all class loaders |
1332 // for parallelCapable class loaders. JDK >=7, loadClass(String, boolean) will | |
1333 // acquire a class-name based lock rather than the class loader object lock. | |
1334 // JDK < 7 already acquire the class loader lock in loadClass(String, boolean), | |
1335 // so the call to loadClassInternal() was not required. | |
1336 // | |
1337 // UnsyncloadClass flag means both call loadClass(String) and do | |
1338 // not acquire the class loader lock even for class loaders that are | |
1339 // not parallelCapable. This was a risky transitional | |
1340 // flag for diagnostic purposes only. It is risky to call | |
0 | 1341 // custom class loaders without synchronization. |
1342 // WARNING If a custom class loader does NOT synchronizer findClass, or callers of | |
514 | 1343 // findClass, the UnsyncloadClass flag risks unexpected timing bugs in the field. |
0 | 1344 // Do NOT assume this will be supported in future releases. |
514 | 1345 // |
1346 // Added MustCallLoadClassInternal in case we discover in the field | |
1347 // a customer that counts on this call | |
1348 if (MustCallLoadClassInternal && has_loadClassInternal()) { | |
0 | 1349 JavaCalls::call_special(&result, |
1350 class_loader, | |
1351 spec_klass, | |
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1352 vmSymbols::loadClassInternal_name(), |
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1353 vmSymbols::string_class_signature(), |
0 | 1354 string, |
1355 CHECK_(nh)); | |
1356 } else { | |
1357 JavaCalls::call_virtual(&result, | |
1358 class_loader, | |
1359 spec_klass, | |
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1360 vmSymbols::loadClass_name(), |
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1361 vmSymbols::string_class_signature(), |
0 | 1362 string, |
1363 CHECK_(nh)); | |
1364 } | |
1365 | |
1366 assert(result.get_type() == T_OBJECT, "just checking"); | |
1367 oop obj = (oop) result.get_jobject(); | |
1368 | |
1369 // Primitive classes return null since forName() can not be | |
1370 // used to obtain any of the Class objects representing primitives or void | |
1371 if ((obj != NULL) && !(java_lang_Class::is_primitive(obj))) { | |
1372 instanceKlassHandle k = | |
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1373 instanceKlassHandle(THREAD, java_lang_Class::as_Klass(obj)); |
0 | 1374 // For user defined Java class loaders, check that the name returned is |
1375 // the same as that requested. This check is done for the bootstrap | |
1376 // loader when parsing the class file. | |
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1377 if (class_name == k->name()) { |
0 | 1378 return k; |
1379 } | |
1380 } | |
1381 // Class is not found or has the wrong name, return NULL | |
1382 return nh; | |
1383 } | |
1384 } | |
1385 | |
1386 void SystemDictionary::define_instance_class(instanceKlassHandle k, TRAPS) { | |
1387 | |
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1388 ClassLoaderData* loader_data = k->class_loader_data(); |
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1389 Handle class_loader_h(THREAD, loader_data->class_loader()); |
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1390 |
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1391 for (uintx it = 0; it < GCExpandToAllocateDelayMillis; it++){} |
0 | 1392 |
514 | 1393 // for bootstrap and other parallel classloaders don't acquire lock, |
1394 // use placeholder token | |
1395 // If a parallelCapable class loader calls define_instance_class instead of | |
1396 // find_or_define_instance_class to get here, we have a timing | |
1397 // hole with systemDictionary updates and check_constraints | |
1398 if (!class_loader_h.is_null() && !is_parallelCapable(class_loader_h)) { | |
0 | 1399 assert(ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, |
1400 compute_loader_lock_object(class_loader_h, THREAD)), | |
1401 "define called without lock"); | |
1402 } | |
1403 | |
1404 // Check class-loading constraints. Throw exception if violation is detected. | |
1405 // Grabs and releases SystemDictionary_lock | |
1406 // The check_constraints/find_class call and update_dictionary sequence | |
1407 // must be "atomic" for a specific class/classloader pair so we never | |
1408 // define two different instanceKlasses for that class/classloader pair. | |
1409 // Existing classloaders will call define_instance_class with the | |
1410 // classloader lock held | |
1411 // Parallel classloaders will call find_or_define_instance_class | |
1412 // which will require a token to perform the define class | |
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1413 Symbol* name_h = k->name(); |
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1414 unsigned int d_hash = dictionary()->compute_hash(name_h, loader_data); |
0 | 1415 int d_index = dictionary()->hash_to_index(d_hash); |
1416 check_constraints(d_index, d_hash, k, class_loader_h, true, CHECK); | |
1417 | |
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1418 // Register class just loaded with class loader (placed in Vector) |
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1419 // Note we do this before updating the dictionary, as this can |
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1420 // fail with an OutOfMemoryError (if it does, we will *not* put this |
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1421 // class in the dictionary and will not update the class hierarchy). |
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1422 // JVMTI FollowReferences needs to find the classes this way. |
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1423 if (k->class_loader() != NULL) { |
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1424 methodHandle m(THREAD, Universe::loader_addClass_method()); |
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1425 JavaValue result(T_VOID); |
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1426 JavaCallArguments args(class_loader_h); |
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1427 args.push_oop(Handle(THREAD, k->java_mirror())); |
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1428 JavaCalls::call(&result, m, &args, CHECK); |
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1429 } |
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1430 |
0 | 1431 // Add the new class. We need recompile lock during update of CHA. |
1432 { | |
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1433 unsigned int p_hash = placeholders()->compute_hash(name_h, loader_data); |
0 | 1434 int p_index = placeholders()->hash_to_index(p_hash); |
1435 | |
1436 MutexLocker mu_r(Compile_lock, THREAD); | |
1437 | |
1438 // Add to class hierarchy, initialize vtables, and do possible | |
1439 // deoptimizations. | |
1440 add_to_hierarchy(k, CHECK); // No exception, but can block | |
1441 | |
1442 // Add to systemDictionary - so other classes can see it. | |
1443 // Grabs and releases SystemDictionary_lock | |
1444 update_dictionary(d_index, d_hash, p_index, p_hash, | |
1445 k, class_loader_h, THREAD); | |
1446 } | |
1447 k->eager_initialize(THREAD); | |
1448 | |
1449 // notify jvmti | |
1450 if (JvmtiExport::should_post_class_load()) { | |
1451 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); | |
1452 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); | |
1453 | |
1454 } | |
10405 | 1455 |
0 | 1456 } |
1457 | |
1458 // Support parallel classloading | |
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1459 // All parallel class loaders, including bootstrap classloader |
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1460 // lock a placeholder entry for this class/class_loader pair |
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1461 // to allow parallel defines of different classes for this class loader |
514 | 1462 // With AllowParallelDefine flag==true, in case they do not synchronize around |
1463 // FindLoadedClass/DefineClass, calls, we check for parallel | |
0 | 1464 // loading for them, wait if a defineClass is in progress |
1465 // and return the initial requestor's results | |
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1466 // This flag does not apply to the bootstrap classloader. |
514 | 1467 // With AllowParallelDefine flag==false, call through to define_instance_class |
1468 // which will throw LinkageError: duplicate class definition. | |
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1469 // False is the requested default. |
0 | 1470 // For better performance, the class loaders should synchronize |
514 | 1471 // findClass(), i.e. FindLoadedClass/DefineClassIfAbsent or they |
0 | 1472 // potentially waste time reading and parsing the bytestream. |
1473 // Note: VM callers should ensure consistency of k/class_name,class_loader | |
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1474 instanceKlassHandle SystemDictionary::find_or_define_instance_class(Symbol* class_name, Handle class_loader, instanceKlassHandle k, TRAPS) { |
0 | 1475 |
1476 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1477 Symbol* name_h = k->name(); // passed in class_name may be null |
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1478 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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1479 |
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1480 unsigned int d_hash = dictionary()->compute_hash(name_h, loader_data); |
0 | 1481 int d_index = dictionary()->hash_to_index(d_hash); |
1482 | |
1483 // Hold SD lock around find_class and placeholder creation for DEFINE_CLASS | |
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1484 unsigned int p_hash = placeholders()->compute_hash(name_h, loader_data); |
0 | 1485 int p_index = placeholders()->hash_to_index(p_hash); |
1486 PlaceholderEntry* probe; | |
1487 | |
1488 { | |
1489 MutexLocker mu(SystemDictionary_lock, THREAD); | |
1490 // First check if class already defined | |
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1491 if (UnsyncloadClass || (is_parallelDefine(class_loader))) { |
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1492 Klass* check = find_class(d_index, d_hash, name_h, loader_data); |
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1493 if (check != NULL) { |
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1494 return(instanceKlassHandle(THREAD, check)); |
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1495 } |
0 | 1496 } |
1497 | |
1498 // Acquire define token for this class/classloader | |
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1499 probe = placeholders()->find_and_add(p_index, p_hash, name_h, loader_data, PlaceholderTable::DEFINE_CLASS, NULL, THREAD); |
514 | 1500 // Wait if another thread defining in parallel |
1501 // All threads wait - even those that will throw duplicate class: otherwise | |
1502 // caller is surprised by LinkageError: duplicate, but findLoadedClass fails | |
1503 // if other thread has not finished updating dictionary | |
1504 while (probe->definer() != NULL) { | |
1505 SystemDictionary_lock->wait(); | |
1506 } | |
1507 // Only special cases allow parallel defines and can use other thread's results | |
1508 // Other cases fall through, and may run into duplicate defines | |
1509 // caught by finding an entry in the SystemDictionary | |
6983 | 1510 if ((UnsyncloadClass || is_parallelDefine(class_loader)) && (probe->instance_klass() != NULL)) { |
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1511 placeholders()->find_and_remove(p_index, p_hash, name_h, loader_data, PlaceholderTable::DEFINE_CLASS, THREAD); |
514 | 1512 SystemDictionary_lock->notify_all(); |
0 | 1513 #ifdef ASSERT |
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1514 Klass* check = find_class(d_index, d_hash, name_h, loader_data); |
514 | 1515 assert(check != NULL, "definer missed recording success"); |
0 | 1516 #endif |
6983 | 1517 return(instanceKlassHandle(THREAD, probe->instance_klass())); |
0 | 1518 } else { |
514 | 1519 // This thread will define the class (even if earlier thread tried and had an error) |
1520 probe->set_definer(THREAD); | |
0 | 1521 } |
1522 } | |
1523 | |
1524 define_instance_class(k, THREAD); | |
1525 | |
1526 Handle linkage_exception = Handle(); // null handle | |
1527 | |
1528 // definer must notify any waiting threads | |
1529 { | |
1530 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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1531 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name_h, loader_data); |
0 | 1532 assert(probe != NULL, "DEFINE_CLASS placeholder lost?"); |
1533 if (probe != NULL) { | |
1534 if (HAS_PENDING_EXCEPTION) { | |
1535 linkage_exception = Handle(THREAD,PENDING_EXCEPTION); | |
1536 CLEAR_PENDING_EXCEPTION; | |
1537 } else { | |
6983 | 1538 probe->set_instance_klass(k()); |
0 | 1539 } |
1540 probe->set_definer(NULL); | |
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1541 placeholders()->find_and_remove(p_index, p_hash, name_h, loader_data, PlaceholderTable::DEFINE_CLASS, THREAD); |
0 | 1542 SystemDictionary_lock->notify_all(); |
1543 } | |
1544 } | |
1545 | |
1546 // Can't throw exception while holding lock due to rank ordering | |
1547 if (linkage_exception() != NULL) { | |
1548 THROW_OOP_(linkage_exception(), nh); // throws exception and returns | |
1549 } | |
1550 | |
1551 return k; | |
1552 } | |
1553 Handle SystemDictionary::compute_loader_lock_object(Handle class_loader, TRAPS) { | |
1554 // If class_loader is NULL we synchronize on _system_loader_lock_obj | |
1555 if (class_loader.is_null()) { | |
1556 return Handle(THREAD, _system_loader_lock_obj); | |
1557 } else { | |
1558 return class_loader; | |
1559 } | |
1560 } | |
1561 | |
1562 // This method is added to check how often we have to wait to grab loader | |
1563 // lock. The results are being recorded in the performance counters defined in | |
1564 // ClassLoader::_sync_systemLoaderLockContentionRate and | |
1565 // ClassLoader::_sync_nonSystemLoaderLockConteionRate. | |
1566 void SystemDictionary::check_loader_lock_contention(Handle loader_lock, TRAPS) { | |
1567 if (!UsePerfData) { | |
1568 return; | |
1569 } | |
1570 | |
1571 assert(!loader_lock.is_null(), "NULL lock object"); | |
1572 | |
1573 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader_lock) | |
1574 == ObjectSynchronizer::owner_other) { | |
1575 // contention will likely happen, so increment the corresponding | |
1576 // contention counter. | |
1577 if (loader_lock() == _system_loader_lock_obj) { | |
1578 ClassLoader::sync_systemLoaderLockContentionRate()->inc(); | |
1579 } else { | |
1580 ClassLoader::sync_nonSystemLoaderLockContentionRate()->inc(); | |
1581 } | |
1582 } | |
1583 } | |
1584 | |
1585 // ---------------------------------------------------------------------------- | |
1586 // Lookup | |
1587 | |
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1588 Klass* SystemDictionary::find_class(int index, unsigned int hash, |
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1589 Symbol* class_name, |
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1590 ClassLoaderData* loader_data) { |
0 | 1591 assert_locked_or_safepoint(SystemDictionary_lock); |
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1592 assert (index == dictionary()->index_for(class_name, loader_data), |
0 | 1593 "incorrect index?"); |
1594 | |
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1595 Klass* k = dictionary()->find_class(index, hash, class_name, loader_data); |
0 | 1596 return k; |
1597 } | |
1598 | |
1599 | |
1600 // Basic find on classes in the midst of being loaded | |
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1601 Symbol* SystemDictionary::find_placeholder(Symbol* class_name, |
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1602 ClassLoaderData* loader_data) { |
0 | 1603 assert_locked_or_safepoint(SystemDictionary_lock); |
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1604 unsigned int p_hash = placeholders()->compute_hash(class_name, loader_data); |
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1605 int p_index = placeholders()->hash_to_index(p_hash); |
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1606 return placeholders()->find_entry(p_index, p_hash, class_name, loader_data); |
0 | 1607 } |
1608 | |
1609 | |
1610 // Used for assertions and verification only | |
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1611 Klass* SystemDictionary::find_class(Symbol* class_name, ClassLoaderData* loader_data) { |
0 | 1612 #ifndef ASSERT |
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1613 guarantee(VerifyBeforeGC || |
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1614 VerifyDuringGC || |
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1615 VerifyBeforeExit || |
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1616 VerifyDuringStartup || |
0 | 1617 VerifyAfterGC, "too expensive"); |
1618 #endif | |
1619 assert_locked_or_safepoint(SystemDictionary_lock); | |
1620 | |
1621 // First look in the loaded class array | |
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1622 unsigned int d_hash = dictionary()->compute_hash(class_name, loader_data); |
0 | 1623 int d_index = dictionary()->hash_to_index(d_hash); |
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1624 return find_class(d_index, d_hash, class_name, loader_data); |
0 | 1625 } |
1626 | |
1627 | |
1628 // Get the next class in the diictionary. | |
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1629 Klass* SystemDictionary::try_get_next_class() { |
0 | 1630 return dictionary()->try_get_next_class(); |
1631 } | |
1632 | |
1633 | |
1634 // ---------------------------------------------------------------------------- | |
1635 // Update hierachy. This is done before the new klass has been added to the SystemDictionary. The Recompile_lock | |
1636 // is held, to ensure that the compiler is not using the class hierachy, and that deoptimization will kick in | |
1637 // before a new class is used. | |
1638 | |
1639 void SystemDictionary::add_to_hierarchy(instanceKlassHandle k, TRAPS) { | |
1640 assert(k.not_null(), "just checking"); | |
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1641 assert_locked_or_safepoint(Compile_lock); |
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1642 |
0 | 1643 // Link into hierachy. Make sure the vtables are initialized before linking into |
1644 k->append_to_sibling_list(); // add to superklass/sibling list | |
1645 k->process_interfaces(THREAD); // handle all "implements" declarations | |
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1646 k->set_init_state(InstanceKlass::loaded); |
0 | 1647 // Now flush all code that depended on old class hierarchy. |
1648 // Note: must be done *after* linking k into the hierarchy (was bug 12/9/97) | |
1649 // Also, first reinitialize vtable because it may have gotten out of synch | |
1650 // while the new class wasn't connected to the class hierarchy. | |
1651 Universe::flush_dependents_on(k); | |
1652 } | |
1653 | |
1654 | |
1655 // ---------------------------------------------------------------------------- | |
1656 // GC support | |
1657 | |
1658 // Following roots during mark-sweep is separated in two phases. | |
1659 // | |
1660 // The first phase follows preloaded classes and all other system | |
1661 // classes, since these will never get unloaded anyway. | |
1662 // | |
1663 // The second phase removes (unloads) unreachable classes from the | |
1664 // system dictionary and follows the remaining classes' contents. | |
1665 | |
1666 void SystemDictionary::always_strong_oops_do(OopClosure* blk) { | |
1667 blk->do_oop(&_java_system_loader); | |
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1668 blk->do_oop(&_system_loader_lock_obj); |
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1669 |
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1670 dictionary()->always_strong_oops_do(blk); |
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1671 |
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1672 // Visit extra methods |
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1673 invoke_method_table()->oops_do(blk); |
0 | 1674 } |
1675 | |
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1676 void SystemDictionary::always_strong_classes_do(KlassClosure* closure) { |
0 | 1677 // Follow all system classes and temporary placeholders in dictionary |
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1678 dictionary()->always_strong_classes_do(closure); |
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1679 |
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1680 // Placeholders. These represent classes we're actively loading. |
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1681 placeholders()->classes_do(closure); |
0 | 1682 } |
1683 | |
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1684 // Calculate a "good" systemdictionary size based |
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1685 // on predicted or current loaded classes count |
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1686 int SystemDictionary::calculate_systemdictionary_size(int classcount) { |
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1687 int newsize = _old_default_sdsize; |
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1688 if ((classcount > 0) && !DumpSharedSpaces) { |
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1689 int desiredsize = classcount/_average_depth_goal; |
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1690 for (newsize = _primelist[_sdgeneration]; _sdgeneration < _prime_array_size -1; |
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1691 newsize = _primelist[++_sdgeneration]) { |
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1692 if (desiredsize <= newsize) { |
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1693 break; |
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1694 } |
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1695 } |
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1696 } |
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1697 return newsize; |
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1698 } |
10405 | 1699 |
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1700 // Assumes classes in the SystemDictionary are only unloaded at a safepoint |
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1701 // Note: anonymous classes are not in the SD. |
0 | 1702 bool SystemDictionary::do_unloading(BoolObjectClosure* is_alive) { |
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1703 // First, mark for unload all ClassLoaderData referencing a dead class loader. |
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1704 bool has_dead_loaders = ClassLoaderDataGraph::do_unloading(is_alive); |
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1705 bool unloading_occurred = false; |
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1706 if (has_dead_loaders) { |
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1707 unloading_occurred = dictionary()->do_unloading(); |
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1708 constraints()->purge_loader_constraints(); |
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1709 resolution_errors()->purge_resolution_errors(); |
0 | 1710 } |
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1711 return unloading_occurred; |
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1712 } |
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1713 |
0 | 1714 void SystemDictionary::oops_do(OopClosure* f) { |
1715 f->do_oop(&_java_system_loader); | |
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1716 f->do_oop(&_system_loader_lock_obj); |
0 | 1717 |
1718 // Adjust dictionary | |
1719 dictionary()->oops_do(f); | |
1720 | |
710 | 1721 // Visit extra methods |
1903 | 1722 invoke_method_table()->oops_do(f); |
0 | 1723 } |
1724 | |
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1725 // Extended Class redefinition support. |
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1726 // If one of these classes is replaced, we need to replace it in these places. |
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1727 // KlassClosure::do_klass should take the address of a class but we can |
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1728 // change that later. |
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1729 void SystemDictionary::preloaded_classes_do(KlassClosure* f) { |
132
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1730 for (int k = (int)FIRST_WKID; k < (int)WKID_LIMIT; k++) { |
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1731 f->do_klass(_well_known_klasses[k]); |
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1732 } |
0 | 1733 |
1734 { | |
1735 for (int i = 0; i < T_VOID+1; i++) { | |
1736 if (_box_klasses[i] != NULL) { | |
1737 assert(i >= T_BOOLEAN, "checking"); | |
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1738 f->do_klass(_box_klasses[i]); |
0 | 1739 } |
1740 } | |
1741 } | |
1742 | |
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1743 FilteredFieldsMap::classes_do(f); |
0 | 1744 } |
1745 | |
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1746 void SystemDictionary::lazily_loaded_classes_do(KlassClosure* f) { |
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1747 f->do_klass(_abstract_ownable_synchronizer_klass); |
0 | 1748 } |
1749 | |
1750 // Just the classes from defining class loaders | |
1751 // Don't iterate over placeholders | |
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1752 void SystemDictionary::classes_do(void f(Klass*)) { |
0 | 1753 dictionary()->classes_do(f); |
1754 } | |
1755 | |
1756 // Added for initialize_itable_for_klass | |
1757 // Just the classes from defining class loaders | |
1758 // Don't iterate over placeholders | |
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1759 void SystemDictionary::classes_do(void f(Klass*, TRAPS), TRAPS) { |
0 | 1760 dictionary()->classes_do(f, CHECK); |
1761 } | |
1762 | |
1763 // All classes, and their class loaders | |
1764 // Don't iterate over placeholders | |
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1765 void SystemDictionary::classes_do(void f(Klass*, ClassLoaderData*)) { |
0 | 1766 dictionary()->classes_do(f); |
1767 } | |
1768 | |
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1769 void SystemDictionary::placeholders_do(void f(Symbol*)) { |
0 | 1770 placeholders()->entries_do(f); |
1771 } | |
1772 | |
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1773 void SystemDictionary::methods_do(void f(Method*)) { |
0 | 1774 dictionary()->methods_do(f); |
1903 | 1775 invoke_method_table()->methods_do(f); |
0 | 1776 } |
1777 | |
1778 // ---------------------------------------------------------------------------- | |
1779 // Lazily load klasses | |
1780 | |
1781 void SystemDictionary::load_abstract_ownable_synchronizer_klass(TRAPS) { | |
1782 assert(JDK_Version::is_gte_jdk16x_version(), "Must be JDK 1.6 or later"); | |
1783 | |
1784 // if multiple threads calling this function, only one thread will load | |
1785 // the class. The other threads will find the loaded version once the | |
1786 // class is loaded. | |
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1787 Klass* aos = _abstract_ownable_synchronizer_klass; |
0 | 1788 if (aos == NULL) { |
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1789 Klass* k = resolve_or_fail(vmSymbols::java_util_concurrent_locks_AbstractOwnableSynchronizer(), true, CHECK); |
0 | 1790 // Force a fence to prevent any read before the write completes |
1791 OrderAccess::fence(); | |
1792 _abstract_ownable_synchronizer_klass = k; | |
1793 } | |
1794 } | |
1795 | |
1796 // ---------------------------------------------------------------------------- | |
1797 // Initialization | |
1798 | |
1799 void SystemDictionary::initialize(TRAPS) { | |
1800 // Allocate arrays | |
1801 assert(dictionary() == NULL, | |
1802 "SystemDictionary should only be initialized once"); | |
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1803 _sdgeneration = 0; |
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1804 _dictionary = new Dictionary(calculate_systemdictionary_size(PredictedLoadedClassCount)); |
1903 | 1805 _placeholders = new PlaceholderTable(_nof_buckets); |
0 | 1806 _number_of_modifications = 0; |
1903 | 1807 _loader_constraints = new LoaderConstraintTable(_loader_constraint_size); |
1808 _resolution_errors = new ResolutionErrorTable(_resolution_error_size); | |
1809 _invoke_method_table = new SymbolPropertyTable(_invoke_method_size); | |
0 | 1810 |
1811 // Allocate private object used as system class loader lock | |
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1812 _system_loader_lock_obj = oopFactory::new_intArray(0, CHECK); |
0 | 1813 // Initialize basic classes |
1814 initialize_preloaded_classes(CHECK); | |
1815 } | |
1816 | |
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1817 // Compact table of directions on the initialization of klasses: |
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1818 static const short wk_init_info[] = { |
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1819 #define WK_KLASS_INIT_INFO(name, symbol, option) \ |
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1820 ( ((int)vmSymbols::VM_SYMBOL_ENUM_NAME(symbol) \ |
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1821 << SystemDictionary::CEIL_LG_OPTION_LIMIT) \ |
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1822 | (int)SystemDictionary::option ), |
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1823 WK_KLASSES_DO(WK_KLASS_INIT_INFO) |
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1824 #undef WK_KLASS_INIT_INFO |
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1825 0 |
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1826 }; |
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1827 |
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1828 bool SystemDictionary::initialize_wk_klass(WKID id, int init_opt, TRAPS) { |
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1829 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1830 int info = wk_init_info[id - FIRST_WKID]; |
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1831 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1832 Symbol* symbol = vmSymbols::symbol_at((vmSymbols::SID)sid); |
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1833 Klass** klassp = &_well_known_klasses[id]; |
2460 | 1834 bool must_load = (init_opt < SystemDictionary::Opt); |
7951 | 1835 if ((*klassp) == NULL) { |
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1836 if (must_load) { |
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1837 (*klassp) = resolve_or_fail(symbol, true, CHECK_0); // load required class |
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1838 } else { |
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1839 (*klassp) = resolve_or_null(symbol, CHECK_0); // load optional klass |
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1840 } |
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1841 } |
2460 | 1842 return ((*klassp) != NULL); |
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1843 } |
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1844 |
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1845 void SystemDictionary::initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS) { |
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1846 assert((int)start_id <= (int)limit_id, "IDs are out of order!"); |
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1847 for (int id = (int)start_id; id < (int)limit_id; id++) { |
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1848 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1849 int info = wk_init_info[id - FIRST_WKID]; |
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1850 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1851 int opt = (info & right_n_bits(CEIL_LG_OPTION_LIMIT)); |
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1852 |
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1853 initialize_wk_klass((WKID)id, opt, CHECK); |
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1854 } |
710 | 1855 |
1856 // move the starting value forward to the limit: | |
1857 start_id = limit_id; | |
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1858 } |
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1859 |
0 | 1860 void SystemDictionary::initialize_preloaded_classes(TRAPS) { |
1142 | 1861 assert(WK_KLASS(Object_klass) == NULL, "preloaded classes should only be initialized once"); |
0 | 1862 // Preload commonly used klasses |
132
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1863 WKID scan = FIRST_WKID; |
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1864 // first do Object, then String, Class |
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1865 if (UseSharedSpaces) { |
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1866 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Object_klass), scan, CHECK); |
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1867 // Initialize the constant pool for the Object_class |
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1868 InstanceKlass* ik = InstanceKlass::cast(Object_klass()); |
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1869 ik->constants()->restore_unshareable_info(CHECK); |
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1870 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Class_klass), scan, CHECK); |
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1871 } else { |
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1872 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Class_klass), scan, CHECK); |
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1873 } |
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1874 |
6057 | 1875 // Calculate offsets for String and Class classes since they are loaded and |
1876 // can be used after this point. | |
1877 java_lang_String::compute_offsets(); | |
3938 | 1878 java_lang_Class::compute_offsets(); |
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1879 |
0 | 1880 // Fixup mirrors for classes loaded before java.lang.Class. |
1881 // These calls iterate over the objects currently in the perm gen | |
1882 // so calling them at this point is matters (not before when there | |
1883 // are fewer objects and not later after there are more objects | |
1884 // in the perm gen. | |
1885 Universe::initialize_basic_type_mirrors(CHECK); | |
1886 Universe::fixup_mirrors(CHECK); | |
1887 | |
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1888 // do a bunch more: |
1142 | 1889 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Reference_klass), scan, CHECK); |
0 | 1890 |
1891 // Preload ref klasses and set reference types | |
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1892 InstanceKlass::cast(WK_KLASS(Reference_klass))->set_reference_type(REF_OTHER); |
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1893 InstanceRefKlass::update_nonstatic_oop_maps(WK_KLASS(Reference_klass)); |
0 | 1894 |
1142 | 1895 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(PhantomReference_klass), scan, CHECK); |
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1896 InstanceKlass::cast(WK_KLASS(SoftReference_klass))->set_reference_type(REF_SOFT); |
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1897 InstanceKlass::cast(WK_KLASS(WeakReference_klass))->set_reference_type(REF_WEAK); |
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1898 InstanceKlass::cast(WK_KLASS(FinalReference_klass))->set_reference_type(REF_FINAL); |
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1899 InstanceKlass::cast(WK_KLASS(PhantomReference_klass))->set_reference_type(REF_PHANTOM); |
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1900 |
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1901 // JSR 292 classes |
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1902 WKID jsr292_group_start = WK_KLASS_ENUM_NAME(MethodHandle_klass); |
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1903 WKID jsr292_group_end = WK_KLASS_ENUM_NAME(VolatileCallSite_klass); |
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1904 initialize_wk_klasses_until(jsr292_group_start, scan, CHECK); |
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1905 if (EnableInvokeDynamic) { |
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1906 initialize_wk_klasses_through(jsr292_group_end, scan, CHECK); |
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1907 } else { |
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1908 // Skip the JSR 292 classes, if not enabled. |
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1909 scan = WKID(jsr292_group_end + 1); |
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1910 } |
710 | 1911 |
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1912 initialize_wk_klasses_until(WKID_LIMIT, scan, CHECK); |
0 | 1913 |
1142 | 1914 _box_klasses[T_BOOLEAN] = WK_KLASS(Boolean_klass); |
1915 _box_klasses[T_CHAR] = WK_KLASS(Character_klass); | |
1916 _box_klasses[T_FLOAT] = WK_KLASS(Float_klass); | |
1917 _box_klasses[T_DOUBLE] = WK_KLASS(Double_klass); | |
1918 _box_klasses[T_BYTE] = WK_KLASS(Byte_klass); | |
1919 _box_klasses[T_SHORT] = WK_KLASS(Short_klass); | |
1920 _box_klasses[T_INT] = WK_KLASS(Integer_klass); | |
1921 _box_klasses[T_LONG] = WK_KLASS(Long_klass); | |
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1922 //_box_klasses[T_OBJECT] = WK_KLASS(object_klass); |
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1923 //_box_klasses[T_ARRAY] = WK_KLASS(object_klass); |
0 | 1924 |
1925 { // Compute whether we should use loadClass or loadClassInternal when loading classes. | |
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1926 Method* method = InstanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::loadClassInternal_name(), vmSymbols::string_class_signature()); |
0 | 1927 _has_loadClassInternal = (method != NULL); |
1928 } | |
1929 { // Compute whether we should use checkPackageAccess or NOT | |
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1930 Method* method = InstanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::checkPackageAccess_name(), vmSymbols::class_protectiondomain_signature()); |
0 | 1931 _has_checkPackageAccess = (method != NULL); |
1932 } | |
1933 } | |
1934 | |
1935 // Tells if a given klass is a box (wrapper class, such as java.lang.Integer). | |
1936 // If so, returns the basic type it holds. If not, returns T_OBJECT. | |
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1937 BasicType SystemDictionary::box_klass_type(Klass* k) { |
0 | 1938 assert(k != NULL, ""); |
1939 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { | |
1940 if (_box_klasses[i] == k) | |
1941 return (BasicType)i; | |
1942 } | |
1943 return T_OBJECT; | |
1944 } | |
1945 | |
1946 // Constraints on class loaders. The details of the algorithm can be | |
1947 // found in the OOPSLA'98 paper "Dynamic Class Loading in the Java | |
1948 // Virtual Machine" by Sheng Liang and Gilad Bracha. The basic idea is | |
1949 // that the system dictionary needs to maintain a set of contraints that | |
1950 // must be satisfied by all classes in the dictionary. | |
1951 // if defining is true, then LinkageError if already in systemDictionary | |
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1952 // if initiating loader, then ok if InstanceKlass matches existing entry |
0 | 1953 |
1954 void SystemDictionary::check_constraints(int d_index, unsigned int d_hash, | |
1955 instanceKlassHandle k, | |
1956 Handle class_loader, bool defining, | |
1957 TRAPS) { | |
1958 const char *linkage_error = NULL; | |
1959 { | |
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1960 Symbol* name = k->name(); |
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1961 ClassLoaderData *loader_data = class_loader_data(class_loader); |
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1962 |
0 | 1963 MutexLocker mu(SystemDictionary_lock, THREAD); |
1964 | |
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1965 Klass* check = find_class(d_index, d_hash, name, loader_data); |
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1966 if (check != (Klass*)NULL) { |
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1967 // if different InstanceKlass - duplicate class definition, |
0 | 1968 // else - ok, class loaded by a different thread in parallel, |
1969 // we should only have found it if it was done loading and ok to use | |
1970 // system dictionary only holds instance classes, placeholders | |
1971 // also holds array classes | |
1972 | |
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1973 assert(check->oop_is_instance(), "noninstance in systemdictionary"); |
0 | 1974 if ((defining == true) || (k() != check)) { |
1975 linkage_error = "loader (instance of %s): attempted duplicate class " | |
1976 "definition for name: \"%s\""; | |
1977 } else { | |
1978 return; | |
1979 } | |
1980 } | |
1981 | |
1982 #ifdef ASSERT | |
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1983 Symbol* ph_check = find_placeholder(name, loader_data); |
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1984 assert(ph_check == NULL || ph_check == name, "invalid symbol"); |
0 | 1985 #endif |
1986 | |
1987 if (linkage_error == NULL) { | |
1988 if (constraints()->check_or_update(k, class_loader, name) == false) { | |
1989 linkage_error = "loader constraint violation: loader (instance of %s)" | |
1990 " previously initiated loading for a different type with name \"%s\""; | |
1991 } | |
1992 } | |
1993 } | |
1994 | |
1995 // Throw error now if needed (cannot throw while holding | |
1996 // SystemDictionary_lock because of rank ordering) | |
1997 | |
1998 if (linkage_error) { | |
1999 ResourceMark rm(THREAD); | |
2000 const char* class_loader_name = loader_name(class_loader()); | |
2001 char* type_name = k->name()->as_C_string(); | |
2002 size_t buflen = strlen(linkage_error) + strlen(class_loader_name) + | |
2003 strlen(type_name); | |
2004 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
2005 jio_snprintf(buf, buflen, linkage_error, class_loader_name, type_name); | |
2006 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); | |
2007 } | |
2008 } | |
2009 | |
2010 | |
2011 // Update system dictionary - done after check_constraint and add_to_hierachy | |
2012 // have been called. | |
2013 void SystemDictionary::update_dictionary(int d_index, unsigned int d_hash, | |
2014 int p_index, unsigned int p_hash, | |
2015 instanceKlassHandle k, | |
2016 Handle class_loader, | |
2017 TRAPS) { | |
2018 // Compile_lock prevents systemDictionary updates during compilations | |
2019 assert_locked_or_safepoint(Compile_lock); | |
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2020 Symbol* name = k->name(); |
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2021 ClassLoaderData *loader_data = class_loader_data(class_loader); |
0 | 2022 |
2023 { | |
2024 MutexLocker mu1(SystemDictionary_lock, THREAD); | |
2025 | |
2026 // See whether biased locking is enabled and if so set it for this | |
2027 // klass. | |
2028 // Note that this must be done past the last potential blocking | |
2029 // point / safepoint. We enable biased locking lazily using a | |
2030 // VM_Operation to iterate the SystemDictionary and installing the | |
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2031 // biasable mark word into each InstanceKlass's prototype header. |
0 | 2032 // To avoid race conditions where we accidentally miss enabling the |
2033 // optimization for one class in the process of being added to the | |
2034 // dictionary, we must not safepoint after the test of | |
2035 // BiasedLocking::enabled(). | |
2036 if (UseBiasedLocking && BiasedLocking::enabled()) { | |
2037 // Set biased locking bit for all loaded classes; it will be | |
2038 // cleared if revocation occurs too often for this type | |
2039 // NOTE that we must only do this when the class is initally | |
2040 // defined, not each time it is referenced from a new class loader | |
2041 if (k->class_loader() == class_loader()) { | |
2042 k->set_prototype_header(markOopDesc::biased_locking_prototype()); | |
2043 } | |
2044 } | |
2045 | |
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2046 // Make a new system dictionary entry. |
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2047 Klass* sd_check = find_class(d_index, d_hash, name, loader_data); |
0 | 2048 if (sd_check == NULL) { |
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2049 dictionary()->add_klass(name, loader_data, k); |
0 | 2050 notice_modification(); |
2051 } | |
2052 #ifdef ASSERT | |
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2053 sd_check = find_class(d_index, d_hash, name, loader_data); |
0 | 2054 assert (sd_check != NULL, "should have entry in system dictionary"); |
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2055 // Note: there may be a placeholder entry: for circularity testing |
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2056 // or for parallel defines |
0 | 2057 #endif |
2058 SystemDictionary_lock->notify_all(); | |
2059 } | |
2060 } | |
2061 | |
2062 | |
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2063 // Try to find a class name using the loader constraints. The |
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2064 // loader constraints might know about a class that isn't fully loaded |
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2065 // yet and these will be ignored. |
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2066 Klass* SystemDictionary::find_constrained_instance_or_array_klass( |
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2067 Symbol* class_name, Handle class_loader, TRAPS) { |
0 | 2068 |
2069 // First see if it has been loaded directly. | |
2070 // Force the protection domain to be null. (This removes protection checks.) | |
2071 Handle no_protection_domain; | |
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2072 Klass* klass = find_instance_or_array_klass(class_name, class_loader, |
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2073 no_protection_domain, CHECK_NULL); |
0 | 2074 if (klass != NULL) |
2075 return klass; | |
2076 | |
2077 // Now look to see if it has been loaded elsewhere, and is subject to | |
2078 // a loader constraint that would require this loader to return the | |
2079 // klass that is already loaded. | |
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2080 if (FieldType::is_array(class_name)) { |
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2081 // For array classes, their Klass*s are not kept in the |
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2082 // constraint table. The element Klass*s are. |
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2083 FieldArrayInfo fd; |
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2084 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
0 | 2085 if (t != T_OBJECT) { |
2086 klass = Universe::typeArrayKlassObj(t); | |
2087 } else { | |
2088 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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2089 klass = constraints()->find_constrained_klass(fd.object_key(), class_loader); |
0 | 2090 } |
1336 | 2091 // If element class already loaded, allocate array klass |
0 | 2092 if (klass != NULL) { |
6983 | 2093 klass = klass->array_klass_or_null(fd.dimension()); |
0 | 2094 } |
2095 } else { | |
2096 MutexLocker mu(SystemDictionary_lock, THREAD); | |
2097 // Non-array classes are easy: simply check the constraint table. | |
2098 klass = constraints()->find_constrained_klass(class_name, class_loader); | |
2099 } | |
2100 | |
2101 return klass; | |
2102 } | |
2103 | |
2104 | |
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2105 bool SystemDictionary::add_loader_constraint(Symbol* class_name, |
0 | 2106 Handle class_loader1, |
2107 Handle class_loader2, | |
2108 Thread* THREAD) { | |
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2109 ClassLoaderData* loader_data1 = class_loader_data(class_loader1); |
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2110 ClassLoaderData* loader_data2 = class_loader_data(class_loader2); |
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2111 |
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2112 Symbol* constraint_name = NULL; |
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2113 if (!FieldType::is_array(class_name)) { |
1336 | 2114 constraint_name = class_name; |
2115 } else { | |
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2116 // For array classes, their Klass*s are not kept in the |
1336 | 2117 // constraint table. The element classes are. |
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2118 FieldArrayInfo fd; |
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2119 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(false)); |
1336 | 2120 // primitive types always pass |
2121 if (t != T_OBJECT) { | |
2122 return true; | |
2123 } else { | |
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2124 constraint_name = fd.object_key(); |
1336 | 2125 } |
2126 } | |
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2127 unsigned int d_hash1 = dictionary()->compute_hash(constraint_name, loader_data1); |
0 | 2128 int d_index1 = dictionary()->hash_to_index(d_hash1); |
2129 | |
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2130 unsigned int d_hash2 = dictionary()->compute_hash(constraint_name, loader_data2); |
0 | 2131 int d_index2 = dictionary()->hash_to_index(d_hash2); |
2132 { | |
1336 | 2133 MutexLocker mu_s(SystemDictionary_lock, THREAD); |
0 | 2134 |
1336 | 2135 // Better never do a GC while we're holding these oops |
2136 No_Safepoint_Verifier nosafepoint; | |
0 | 2137 |
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2138 Klass* klass1 = find_class(d_index1, d_hash1, constraint_name, loader_data1); |
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2139 Klass* klass2 = find_class(d_index2, d_hash2, constraint_name, loader_data2); |
1336 | 2140 return constraints()->add_entry(constraint_name, klass1, class_loader1, |
2141 klass2, class_loader2); | |
0 | 2142 } |
2143 } | |
2144 | |
2145 // Add entry to resolution error table to record the error when the first | |
2146 // attempt to resolve a reference to a class has failed. | |
2177
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2147 void SystemDictionary::add_resolution_error(constantPoolHandle pool, int which, Symbol* error) { |
0 | 2148 unsigned int hash = resolution_errors()->compute_hash(pool, which); |
2149 int index = resolution_errors()->hash_to_index(hash); | |
2150 { | |
2151 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
2152 resolution_errors()->add_entry(index, hash, pool, which, error); | |
2153 } | |
2154 } | |
2155 | |
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2156 // Delete a resolution error for RedefineClasses for a constant pool is going away |
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2157 void SystemDictionary::delete_resolution_error(ConstantPool* pool) { |
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2158 resolution_errors()->delete_entry(pool); |
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2159 } |
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2160 |
0 | 2161 // Lookup resolution error table. Returns error if found, otherwise NULL. |
2177
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2162 Symbol* SystemDictionary::find_resolution_error(constantPoolHandle pool, int which) { |
0 | 2163 unsigned int hash = resolution_errors()->compute_hash(pool, which); |
2164 int index = resolution_errors()->hash_to_index(hash); | |
2165 { | |
2166 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
2167 ResolutionErrorEntry* entry = resolution_errors()->find_entry(index, hash, pool, which); | |
2177
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2168 return (entry != NULL) ? entry->error() : (Symbol*)NULL; |
0 | 2169 } |
2170 } | |
2171 | |
2172 | |
665
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2173 // Signature constraints ensure that callers and callees agree about |
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2174 // the meaning of type names in their signatures. This routine is the |
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2175 // intake for constraints. It collects them from several places: |
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2176 // |
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2177 // * LinkResolver::resolve_method (if check_access is true) requires |
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2178 // that the resolving class (the caller) and the defining class of |
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2179 // the resolved method (the callee) agree on each type in the |
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2180 // method's signature. |
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2181 // |
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2182 // * LinkResolver::resolve_interface_method performs exactly the same |
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2183 // checks. |
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2184 // |
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2185 // * LinkResolver::resolve_field requires that the constant pool |
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2186 // attempting to link to a field agree with the field's defining |
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2187 // class about the type of the field signature. |
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2188 // |
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2189 // * klassVtable::initialize_vtable requires that, when a class |
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2190 // overrides a vtable entry allocated by a superclass, that the |
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2191 // overriding method (i.e., the callee) agree with the superclass |
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2192 // on each type in the method's signature. |
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2193 // |
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2194 // * klassItable::initialize_itable requires that, when a class fills |
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2195 // in its itables, for each non-abstract method installed in an |
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2196 // itable, the method (i.e., the callee) agree with the interface |
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2197 // on each type in the method's signature. |
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2198 // |
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2199 // All those methods have a boolean (check_access, checkconstraints) |
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2200 // which turns off the checks. This is used from specialized contexts |
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2201 // such as bootstrapping, dumping, and debugging. |
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2202 // |
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2203 // No direct constraint is placed between the class and its |
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2204 // supertypes. Constraints are only placed along linked relations |
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2205 // between callers and callees. When a method overrides or implements |
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2206 // an abstract method in a supertype (superclass or interface), the |
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2207 // constraints are placed as if the supertype were the caller to the |
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2208 // overriding method. (This works well, since callers to the |
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2209 // supertype have already established agreement between themselves and |
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2210 // the supertype.) As a result of all this, a class can disagree with |
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2211 // its supertype about the meaning of a type name, as long as that |
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2212 // class neither calls a relevant method of the supertype, nor is |
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2213 // called (perhaps via an override) from the supertype. |
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2214 // |
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2215 // |
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2216 // SystemDictionary::check_signature_loaders(sig, l1, l2) |
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2217 // |
0 | 2218 // Make sure all class components (including arrays) in the given |
2219 // signature will be resolved to the same class in both loaders. | |
2220 // Returns the name of the type that failed a loader constraint check, or | |
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2221 // NULL if no constraint failed. No exception except OOME is thrown. |
1336 | 2222 // Arrays are not added to the loader constraint table, their elements are. |
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2223 Symbol* SystemDictionary::check_signature_loaders(Symbol* signature, |
0 | 2224 Handle loader1, Handle loader2, |
2225 bool is_method, TRAPS) { | |
2226 // Nothing to do if loaders are the same. | |
2227 if (loader1() == loader2()) { | |
2228 return NULL; | |
2229 } | |
2230 | |
2231 SignatureStream sig_strm(signature, is_method); | |
2232 while (!sig_strm.is_done()) { | |
2233 if (sig_strm.is_object()) { | |
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2234 Symbol* sig = sig_strm.as_symbol(CHECK_NULL); |
0 | 2235 if (!add_loader_constraint(sig, loader1, loader2, THREAD)) { |
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2236 return sig; |
0 | 2237 } |
2238 } | |
2239 sig_strm.next(); | |
2240 } | |
2241 return NULL; | |
2242 } | |
2243 | |
2244 | |
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2245 methodHandle SystemDictionary::find_method_handle_intrinsic(vmIntrinsics::ID iid, |
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2246 Symbol* signature, |
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2247 TRAPS) { |
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2248 methodHandle empty; |
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2249 assert(EnableInvokeDynamic, ""); |
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2250 assert(MethodHandles::is_signature_polymorphic(iid) && |
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2251 MethodHandles::is_signature_polymorphic_intrinsic(iid) && |
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2252 iid != vmIntrinsics::_invokeGeneric, |
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2253 err_msg("must be a known MH intrinsic iid=%d: %s", iid, vmIntrinsics::name_at(iid))); |
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2254 |
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2255 unsigned int hash = invoke_method_table()->compute_hash(signature, iid); |
710 | 2256 int index = invoke_method_table()->hash_to_index(hash); |
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2257 SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, iid); |
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2258 methodHandle m; |
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2259 if (spe == NULL || spe->method() == NULL) { |
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2260 spe = NULL; |
710 | 2261 // Must create lots of stuff here, but outside of the SystemDictionary lock. |
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2262 m = Method::make_method_handle_intrinsic(iid, signature, CHECK_(empty)); |
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2263 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_highest_tier, |
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2264 methodHandle(), CompileThreshold, "MH", CHECK_(empty)); |
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2265 |
710 | 2266 // Now grab the lock. We might have to throw away the new method, |
2267 // if a racing thread has managed to install one at the same time. | |
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2268 { |
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2269 MutexLocker ml(SystemDictionary_lock, THREAD); |
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2270 spe = invoke_method_table()->find_entry(index, hash, signature, iid); |
710 | 2271 if (spe == NULL) |
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2272 spe = invoke_method_table()->add_entry(index, hash, signature, iid); |
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2273 if (spe->method() == NULL) |
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2274 spe->set_method(m()); |
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2275 } |
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2276 } |
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2277 |
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2278 assert(spe != NULL && spe->method() != NULL, ""); |
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2279 return spe->method(); |
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2280 } |
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2281 |
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2282 // Helper for unpacking the return value from linkMethod and linkCallSite. |
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2283 static methodHandle unpack_method_and_appendix(Handle mname, |
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2284 KlassHandle accessing_klass, |
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2285 objArrayHandle appendix_box, |
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2286 Handle* appendix_result, |
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2287 TRAPS) { |
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2288 methodHandle empty; |
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2289 if (mname.not_null()) { |
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2290 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); |
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2291 if (vmtarget != NULL && vmtarget->is_method()) { |
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2292 Method* m = (Method*)vmtarget; |
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2293 oop appendix = appendix_box->obj_at(0); |
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2294 if (TraceMethodHandles) { |
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|
2295 #ifndef PRODUCT |
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2296 tty->print("Linked method="INTPTR_FORMAT": ", m); |
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2297 m->print(); |
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2298 if (appendix != NULL) { tty->print("appendix = "); appendix->print(); } |
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2299 tty->cr(); |
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2300 #endif //PRODUCT |
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2301 } |
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2302 (*appendix_result) = Handle(THREAD, appendix); |
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2303 // the target is stored in the cpCache and if a reference to this |
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2304 // MethodName is dropped we need a way to make sure the |
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2305 // class_loader containing this method is kept alive. |
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2306 // FIXME: the appendix might also preserve this dependency. |
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2307 ClassLoaderData* this_key = InstanceKlass::cast(accessing_klass())->class_loader_data(); |
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2308 this_key->record_dependency(m->method_holder(), CHECK_NULL); // Can throw OOM |
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2309 return methodHandle(THREAD, m); |
710 | 2310 } |
2311 } | |
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2312 THROW_MSG_(vmSymbols::java_lang_LinkageError(), "bad value from MethodHandleNatives", empty); |
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2313 return empty; |
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2314 } |
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2315 |
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2316 methodHandle SystemDictionary::find_method_handle_invoker(Symbol* name, |
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2317 Symbol* signature, |
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2318 KlassHandle accessing_klass, |
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2319 Handle *appendix_result, |
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2320 Handle *method_type_result, |
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2321 TRAPS) { |
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2322 methodHandle empty; |
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2323 assert(EnableInvokeDynamic, ""); |
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2324 assert(!THREAD->is_Compiler_thread(), ""); |
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2325 Handle method_type = |
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2326 SystemDictionary::find_method_handle_type(signature, accessing_klass, CHECK_(empty)); |
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2327 if (false) { // FIXME: Decide if the Java upcall should resolve signatures. |
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2328 method_type = java_lang_String::create_from_symbol(signature, CHECK_(empty)); |
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2329 } |
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2330 |
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2331 KlassHandle mh_klass = SystemDictionary::MethodHandle_klass(); |
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2332 int ref_kind = JVM_REF_invokeVirtual; |
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2333 Handle name_str = StringTable::intern(name, CHECK_(empty)); |
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2334 objArrayHandle appendix_box = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1, CHECK_(empty)); |
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2335 assert(appendix_box->obj_at(0) == NULL, ""); |
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2336 |
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2337 // call java.lang.invoke.MethodHandleNatives::linkMethod(... String, MethodType) -> MemberName |
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2338 JavaCallArguments args; |
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2339 args.push_oop(accessing_klass()->java_mirror()); |
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2340 args.push_int(ref_kind); |
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2341 args.push_oop(mh_klass()->java_mirror()); |
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2342 args.push_oop(name_str()); |
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2343 args.push_oop(method_type()); |
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2344 args.push_oop(appendix_box()); |
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2345 JavaValue result(T_OBJECT); |
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2346 JavaCalls::call_static(&result, |
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2347 SystemDictionary::MethodHandleNatives_klass(), |
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2348 vmSymbols::linkMethod_name(), |
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2349 vmSymbols::linkMethod_signature(), |
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2350 &args, CHECK_(empty)); |
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2351 Handle mname(THREAD, (oop) result.get_jobject()); |
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2352 (*method_type_result) = method_type; |
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2353 return unpack_method_and_appendix(mname, accessing_klass, appendix_box, appendix_result, THREAD); |
710 | 2354 } |
2355 | |
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2356 |
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2357 // Ask Java code to find or construct a java.lang.invoke.MethodType for the given |
710 | 2358 // signature, as interpreted relative to the given class loader. |
2359 // Because of class loader constraints, all method handle usage must be | |
2360 // consistent with this loader. | |
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2361 Handle SystemDictionary::find_method_handle_type(Symbol* signature, |
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2362 KlassHandle accessing_klass, |
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2363 TRAPS) { |
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2364 Handle empty; |
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2365 vmIntrinsics::ID null_iid = vmIntrinsics::_none; // distinct from all method handle invoker intrinsics |
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2366 unsigned int hash = invoke_method_table()->compute_hash(signature, null_iid); |
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2367 int index = invoke_method_table()->hash_to_index(hash); |
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2368 SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, null_iid); |
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2369 if (spe != NULL && spe->method_type() != NULL) { |
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2370 assert(java_lang_invoke_MethodType::is_instance(spe->method_type()), ""); |
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2371 return Handle(THREAD, spe->method_type()); |
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2372 } else if (THREAD->is_Compiler_thread()) { |
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2373 warning("SystemDictionary::find_method_handle_type called from compiler thread"); // FIXME |
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2374 return Handle(); // do not attempt from within compiler, unless it was cached |
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2375 } |
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2376 |
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2377 Handle class_loader, protection_domain; |
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2378 bool is_on_bcp = true; // keep this true as long as we can materialize from the boot classloader |
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2379 int npts = ArgumentCount(signature).size(); |
1142 | 2380 objArrayHandle pts = oopFactory::new_objArray(SystemDictionary::Class_klass(), npts, CHECK_(empty)); |
710 | 2381 int arg = 0; |
2382 Handle rt; // the return type from the signature | |
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2383 ResourceMark rm(THREAD); |
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2384 for (SignatureStream ss(signature); !ss.is_done(); ss.next()) { |
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2385 oop mirror = NULL; |
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2386 if (is_on_bcp) { |
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2387 // Note: class_loader & protection_domain are both null at this point. |
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2388 mirror = ss.as_java_mirror(class_loader, protection_domain, |
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2389 SignatureStream::ReturnNull, CHECK_(empty)); |
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2390 if (mirror == NULL) { |
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2391 // fall back from BCP to accessing_klass |
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2392 if (accessing_klass.not_null()) { |
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2393 class_loader = Handle(THREAD, InstanceKlass::cast(accessing_klass())->class_loader()); |
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2394 protection_domain = Handle(THREAD, InstanceKlass::cast(accessing_klass())->protection_domain()); |
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2395 } |
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2396 is_on_bcp = false; |
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2397 } |
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2398 } |
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2399 if (!is_on_bcp) { |
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2400 // Resolve, throwing a real error if it doesn't work. |
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2401 mirror = ss.as_java_mirror(class_loader, protection_domain, |
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2402 SignatureStream::NCDFError, CHECK_(empty)); |
710 | 2403 } |
2404 if (ss.at_return_type()) | |
2405 rt = Handle(THREAD, mirror); | |
2406 else | |
2407 pts->obj_at_put(arg++, mirror); | |
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2408 |
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2409 // Check accessibility. |
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2410 if (ss.is_object() && accessing_klass.not_null()) { |
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2411 Klass* sel_klass = java_lang_Class::as_Klass(mirror); |
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2412 mirror = NULL; // safety |
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2413 // Emulate ConstantPool::verify_constant_pool_resolve. |
6983 | 2414 if (sel_klass->oop_is_objArray()) |
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2415 sel_klass = ObjArrayKlass::cast(sel_klass)->bottom_klass(); |
6983 | 2416 if (sel_klass->oop_is_instance()) { |
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2417 KlassHandle sel_kh(THREAD, sel_klass); |
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2418 LinkResolver::check_klass_accessability(accessing_klass, sel_kh, CHECK_(empty)); |
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2419 } |
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2420 } |
710 | 2421 } |
2422 assert(arg == npts, ""); | |
2423 | |
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2424 // call java.lang.invoke.MethodHandleNatives::findMethodType(Class rt, Class[] pts) -> MethodType |
710 | 2425 JavaCallArguments args(Handle(THREAD, rt())); |
2426 args.push_oop(pts()); | |
2427 JavaValue result(T_OBJECT); | |
2428 JavaCalls::call_static(&result, | |
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2429 SystemDictionary::MethodHandleNatives_klass(), |
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2430 vmSymbols::findMethodHandleType_name(), |
2460 | 2431 vmSymbols::findMethodHandleType_signature(), |
710 | 2432 &args, CHECK_(empty)); |
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2433 Handle method_type(THREAD, (oop) result.get_jobject()); |
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2434 |
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|
2435 if (is_on_bcp) { |
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2436 // We can cache this MethodType inside the JVM. |
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2437 MutexLocker ml(SystemDictionary_lock, THREAD); |
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2438 spe = invoke_method_table()->find_entry(index, hash, signature, null_iid); |
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2439 if (spe == NULL) |
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2440 spe = invoke_method_table()->add_entry(index, hash, signature, null_iid); |
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2441 if (spe->method_type() == NULL) { |
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2442 spe->set_method_type(method_type()); |
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2443 } |
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2444 } |
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2445 |
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2446 // report back to the caller with the MethodType |
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2447 return method_type; |
710 | 2448 } |
2449 | |
1602 | 2450 // Ask Java code to find or construct a method handle constant. |
2451 Handle SystemDictionary::link_method_handle_constant(KlassHandle caller, | |
2452 int ref_kind, //e.g., JVM_REF_invokeVirtual | |
2453 KlassHandle callee, | |
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2454 Symbol* name_sym, |
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2455 Symbol* signature, |
1602 | 2456 TRAPS) { |
2457 Handle empty; | |
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2458 Handle name = java_lang_String::create_from_symbol(name_sym, CHECK_(empty)); |
1602 | 2459 Handle type; |
2460 if (signature->utf8_length() > 0 && signature->byte_at(0) == '(') { | |
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2461 type = find_method_handle_type(signature, caller, CHECK_(empty)); |
1602 | 2462 } else { |
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2463 ResourceMark rm(THREAD); |
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2464 SignatureStream ss(signature, false); |
1602 | 2465 if (!ss.is_done()) { |
2466 oop mirror = ss.as_java_mirror(caller->class_loader(), caller->protection_domain(), | |
2467 SignatureStream::NCDFError, CHECK_(empty)); | |
2468 type = Handle(THREAD, mirror); | |
2469 ss.next(); | |
2470 if (!ss.is_done()) type = Handle(); // error! | |
2471 } | |
2472 } | |
2473 if (type.is_null()) { | |
2474 THROW_MSG_(vmSymbols::java_lang_LinkageError(), "bad signature", empty); | |
2475 } | |
2476 | |
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2477 // call java.lang.invoke.MethodHandleNatives::linkMethodHandleConstant(Class caller, int refKind, Class callee, String name, Object type) -> MethodHandle |
1602 | 2478 JavaCallArguments args; |
2479 args.push_oop(caller->java_mirror()); // the referring class | |
2480 args.push_int(ref_kind); | |
2481 args.push_oop(callee->java_mirror()); // the target class | |
2482 args.push_oop(name()); | |
2483 args.push_oop(type()); | |
2484 JavaValue result(T_OBJECT); | |
2485 JavaCalls::call_static(&result, | |
2486 SystemDictionary::MethodHandleNatives_klass(), | |
2487 vmSymbols::linkMethodHandleConstant_name(), | |
2460 | 2488 vmSymbols::linkMethodHandleConstant_signature(), |
1602 | 2489 &args, CHECK_(empty)); |
2490 return Handle(THREAD, (oop) result.get_jobject()); | |
2491 } | |
710 | 2492 |
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2493 // Ask Java code to find or construct a java.lang.invoke.CallSite for the given |
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2494 // name and signature, as interpreted relative to the given class loader. |
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2495 methodHandle SystemDictionary::find_dynamic_call_site_invoker(KlassHandle caller, |
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2496 Handle bootstrap_specifier, |
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2497 Symbol* name, |
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2498 Symbol* type, |
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2499 Handle *appendix_result, |
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2500 Handle *method_type_result, |
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2501 TRAPS) { |
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2502 methodHandle empty; |
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|
2503 Handle bsm, info; |
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2504 if (java_lang_invoke_MethodHandle::is_instance(bootstrap_specifier())) { |
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2505 bsm = bootstrap_specifier; |
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2506 } else { |
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2507 assert(bootstrap_specifier->is_objArray(), ""); |
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2508 objArrayHandle args(THREAD, (objArrayOop) bootstrap_specifier()); |
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2509 int len = args->length(); |
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|
2510 assert(len >= 1, ""); |
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2511 bsm = Handle(THREAD, args->obj_at(0)); |
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2512 if (len > 1) { |
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2513 objArrayOop args1 = oopFactory::new_objArray(SystemDictionary::Object_klass(), len-1, CHECK_(empty)); |
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2514 for (int i = 1; i < len; i++) |
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2515 args1->obj_at_put(i-1, args->obj_at(i)); |
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2516 info = Handle(THREAD, args1); |
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2517 } |
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2518 } |
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2519 guarantee(java_lang_invoke_MethodHandle::is_instance(bsm()), |
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2520 "caller must supply a valid BSM"); |
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|
2521 |
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2522 Handle method_name = java_lang_String::create_from_symbol(name, CHECK_(empty)); |
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2523 Handle method_type = find_method_handle_type(type, caller, CHECK_(empty)); |
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2524 |
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2525 objArrayHandle appendix_box = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1, CHECK_(empty)); |
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2526 assert(appendix_box->obj_at(0) == NULL, ""); |
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2527 |
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2528 // call java.lang.invoke.MethodHandleNatives::linkCallSite(caller, bsm, name, mtype, info, &appendix) |
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|
2529 JavaCallArguments args; |
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|
2530 args.push_oop(caller->java_mirror()); |
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|
2531 args.push_oop(bsm()); |
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|
2532 args.push_oop(method_name()); |
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|
2533 args.push_oop(method_type()); |
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cd5dbf694d45
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|
2534 args.push_oop(info()); |
6266
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2535 args.push_oop(appendix_box); |
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|
2536 JavaValue result(T_OBJECT); |
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|
2537 JavaCalls::call_static(&result, |
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|
2538 SystemDictionary::MethodHandleNatives_klass(), |
6266
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2539 vmSymbols::linkCallSite_name(), |
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|
2540 vmSymbols::linkCallSite_signature(), |
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2541 &args, CHECK_(empty)); |
6266
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2542 Handle mname(THREAD, (oop) result.get_jobject()); |
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2543 (*method_type_result) = method_type; |
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2544 return unpack_method_and_appendix(mname, caller, appendix_box, appendix_result, THREAD); |
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2545 } |
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2546 |
0 | 2547 // Since the identity hash code for symbols changes when the symbols are |
2548 // moved from the regular perm gen (hash in the mark word) to the shared | |
2549 // spaces (hash is the address), the classes loaded into the dictionary | |
2550 // may be in the wrong buckets. | |
2551 | |
2552 void SystemDictionary::reorder_dictionary() { | |
2553 dictionary()->reorder_dictionary(); | |
2554 } | |
2555 | |
2556 | |
2557 void SystemDictionary::copy_buckets(char** top, char* end) { | |
2558 dictionary()->copy_buckets(top, end); | |
2559 } | |
2560 | |
2561 | |
2562 void SystemDictionary::copy_table(char** top, char* end) { | |
2563 dictionary()->copy_table(top, end); | |
2564 } | |
2565 | |
2566 | |
2567 void SystemDictionary::reverse() { | |
2568 dictionary()->reverse(); | |
2569 } | |
2570 | |
2571 int SystemDictionary::number_of_classes() { | |
2572 return dictionary()->number_of_entries(); | |
2573 } | |
2574 | |
2575 | |
2576 // ---------------------------------------------------------------------------- | |
2577 #ifndef PRODUCT | |
2578 | |
2579 void SystemDictionary::print() { | |
2580 dictionary()->print(); | |
2581 | |
2582 // Placeholders | |
2583 GCMutexLocker mu(SystemDictionary_lock); | |
2584 placeholders()->print(); | |
2585 | |
2586 // loader constraints - print under SD_lock | |
2587 constraints()->print(); | |
2588 } | |
2589 | |
2590 #endif | |
2591 | |
2592 void SystemDictionary::verify() { | |
2593 guarantee(dictionary() != NULL, "Verify of system dictionary failed"); | |
2594 guarantee(constraints() != NULL, | |
2595 "Verify of loader constraints failed"); | |
2596 guarantee(dictionary()->number_of_entries() >= 0 && | |
2597 placeholders()->number_of_entries() >= 0, | |
2598 "Verify of system dictionary failed"); | |
2599 | |
2600 // Verify dictionary | |
2601 dictionary()->verify(); | |
2602 | |
2603 GCMutexLocker mu(SystemDictionary_lock); | |
2604 placeholders()->verify(); | |
2605 | |
2606 // Verify constraint table | |
2607 guarantee(constraints() != NULL, "Verify of loader constraints failed"); | |
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|
2608 constraints()->verify(dictionary(), placeholders()); |
0 | 2609 } |
2610 | |
2611 | |
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2612 void SystemDictionary::verify_obj_klass_present(Symbol* class_name, |
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2613 ClassLoaderData* loader_data) { |
0 | 2614 GCMutexLocker mu(SystemDictionary_lock); |
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2615 Symbol* name; |
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2616 |
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2617 Klass* probe = find_class(class_name, loader_data); |
0 | 2618 if (probe == NULL) { |
2619 probe = SystemDictionary::find_shared_class(class_name); | |
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2620 if (probe == NULL) { |
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2621 name = find_placeholder(class_name, loader_data); |
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2622 } |
0 | 2623 } |
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2624 guarantee(probe != NULL || name != NULL, |
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2625 "Loaded klasses should be in SystemDictionary"); |
0 | 2626 } |
2627 | |
10405 | 2628 // utility function for class load event |
2629 void SystemDictionary::post_class_load_event(TracingTime start_time, | |
2630 instanceKlassHandle k, | |
2631 Handle initiating_loader) { | |
2632 #if INCLUDE_TRACE | |
2633 EventClassLoad event(UNTIMED); | |
2634 if (event.should_commit()) { | |
2635 event.set_endtime(Tracing::time()); | |
2636 event.set_starttime(start_time); | |
2637 event.set_loadedClass(k()); | |
2638 oop defining_class_loader = k->class_loader(); | |
2639 event.set_definingClassLoader(defining_class_loader != NULL ? | |
2640 defining_class_loader->klass() : (Klass*)NULL); | |
2641 oop class_loader = initiating_loader.is_null() ? (oop)NULL : initiating_loader(); | |
2642 event.set_initiatingClassLoader(class_loader != NULL ? | |
2643 class_loader->klass() : (Klass*)NULL); | |
2644 event.commit(); | |
2645 } | |
2646 #endif /* INCLUDE_TRACE */ | |
2647 } | |
2648 | |
0 | 2649 #ifndef PRODUCT |
2650 | |
2651 // statistics code | |
2652 class ClassStatistics: AllStatic { | |
2653 private: | |
2654 static int nclasses; // number of classes | |
2655 static int nmethods; // number of methods | |
2656 static int nmethoddata; // number of methodData | |
2657 static int class_size; // size of class objects in words | |
2658 static int method_size; // size of method objects in words | |
2659 static int debug_size; // size of debug info in methods | |
2660 static int methoddata_size; // size of methodData objects in words | |
2661 | |
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2662 static void do_class(Klass* k) { |
0 | 2663 nclasses++; |
2664 class_size += k->size(); | |
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2665 if (k->oop_is_instance()) { |
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2666 InstanceKlass* ik = (InstanceKlass*)k; |
0 | 2667 class_size += ik->methods()->size(); |
2668 class_size += ik->constants()->size(); | |
2669 class_size += ik->local_interfaces()->size(); | |
2670 class_size += ik->transitive_interfaces()->size(); | |
2671 // We do not have to count implementors, since we only store one! | |
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2672 // SSS: How should these be accounted now that they have moved? |
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2673 // class_size += ik->fields()->length(); |
0 | 2674 } |
2675 } | |
2676 | |
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2677 static void do_method(Method* m) { |
0 | 2678 nmethods++; |
2679 method_size += m->size(); | |
2680 // class loader uses same objArray for empty vectors, so don't count these | |
2681 if (m->has_stackmap_table()) { | |
2682 method_size += m->stackmap_data()->size(); | |
2683 } | |
2684 | |
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2685 MethodData* mdo = m->method_data(); |
0 | 2686 if (mdo != NULL) { |
2687 nmethoddata++; | |
2688 methoddata_size += mdo->size(); | |
2689 } | |
2690 } | |
2691 | |
2692 public: | |
2693 static void print() { | |
2694 SystemDictionary::classes_do(do_class); | |
2695 SystemDictionary::methods_do(do_method); | |
2696 tty->print_cr("Class statistics:"); | |
2697 tty->print_cr("%d classes (%d bytes)", nclasses, class_size * oopSize); | |
2698 tty->print_cr("%d methods (%d bytes = %d base + %d debug info)", nmethods, | |
2699 (method_size + debug_size) * oopSize, method_size * oopSize, debug_size * oopSize); | |
2700 tty->print_cr("%d methoddata (%d bytes)", nmethoddata, methoddata_size * oopSize); | |
2701 } | |
2702 }; | |
2703 | |
2704 | |
2705 int ClassStatistics::nclasses = 0; | |
2706 int ClassStatistics::nmethods = 0; | |
2707 int ClassStatistics::nmethoddata = 0; | |
2708 int ClassStatistics::class_size = 0; | |
2709 int ClassStatistics::method_size = 0; | |
2710 int ClassStatistics::debug_size = 0; | |
2711 int ClassStatistics::methoddata_size = 0; | |
2712 | |
2713 void SystemDictionary::print_class_statistics() { | |
2714 ResourceMark rm; | |
2715 ClassStatistics::print(); | |
2716 } | |
2717 | |
2718 | |
2719 class MethodStatistics: AllStatic { | |
2720 public: | |
2721 enum { | |
2722 max_parameter_size = 10 | |
2723 }; | |
2724 private: | |
2725 | |
2726 static int _number_of_methods; | |
2727 static int _number_of_final_methods; | |
2728 static int _number_of_static_methods; | |
2729 static int _number_of_native_methods; | |
2730 static int _number_of_synchronized_methods; | |
2731 static int _number_of_profiled_methods; | |
2732 static int _number_of_bytecodes; | |
2733 static int _parameter_size_profile[max_parameter_size]; | |
2734 static int _bytecodes_profile[Bytecodes::number_of_java_codes]; | |
2735 | |
2736 static void initialize() { | |
2737 _number_of_methods = 0; | |
2738 _number_of_final_methods = 0; | |
2739 _number_of_static_methods = 0; | |
2740 _number_of_native_methods = 0; | |
2741 _number_of_synchronized_methods = 0; | |
2742 _number_of_profiled_methods = 0; | |
2743 _number_of_bytecodes = 0; | |
2744 for (int i = 0; i < max_parameter_size ; i++) _parameter_size_profile[i] = 0; | |
2745 for (int j = 0; j < Bytecodes::number_of_java_codes; j++) _bytecodes_profile [j] = 0; | |
2746 }; | |
2747 | |
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2748 static void do_method(Method* m) { |
0 | 2749 _number_of_methods++; |
2750 // collect flag info | |
2751 if (m->is_final() ) _number_of_final_methods++; | |
2752 if (m->is_static() ) _number_of_static_methods++; | |
2753 if (m->is_native() ) _number_of_native_methods++; | |
2754 if (m->is_synchronized()) _number_of_synchronized_methods++; | |
2755 if (m->method_data() != NULL) _number_of_profiled_methods++; | |
2756 // collect parameter size info (add one for receiver, if any) | |
2757 _parameter_size_profile[MIN2(m->size_of_parameters() + (m->is_static() ? 0 : 1), max_parameter_size - 1)]++; | |
2758 // collect bytecodes info | |
2759 { | |
2760 Thread *thread = Thread::current(); | |
2761 HandleMark hm(thread); | |
2762 BytecodeStream s(methodHandle(thread, m)); | |
2763 Bytecodes::Code c; | |
2764 while ((c = s.next()) >= 0) { | |
2765 _number_of_bytecodes++; | |
2766 _bytecodes_profile[c]++; | |
2767 } | |
2768 } | |
2769 } | |
2770 | |
2771 public: | |
2772 static void print() { | |
2773 initialize(); | |
2774 SystemDictionary::methods_do(do_method); | |
2775 // generate output | |
2776 tty->cr(); | |
2777 tty->print_cr("Method statistics (static):"); | |
2778 // flag distribution | |
2779 tty->cr(); | |
2780 tty->print_cr("%6d final methods %6.1f%%", _number_of_final_methods , _number_of_final_methods * 100.0F / _number_of_methods); | |
2781 tty->print_cr("%6d static methods %6.1f%%", _number_of_static_methods , _number_of_static_methods * 100.0F / _number_of_methods); | |
2782 tty->print_cr("%6d native methods %6.1f%%", _number_of_native_methods , _number_of_native_methods * 100.0F / _number_of_methods); | |
2783 tty->print_cr("%6d synchronized methods %6.1f%%", _number_of_synchronized_methods, _number_of_synchronized_methods * 100.0F / _number_of_methods); | |
2784 tty->print_cr("%6d profiled methods %6.1f%%", _number_of_profiled_methods, _number_of_profiled_methods * 100.0F / _number_of_methods); | |
2785 // parameter size profile | |
2786 tty->cr(); | |
2787 { int tot = 0; | |
2788 int avg = 0; | |
2789 for (int i = 0; i < max_parameter_size; i++) { | |
2790 int n = _parameter_size_profile[i]; | |
2791 tot += n; | |
2792 avg += n*i; | |
2793 tty->print_cr("parameter size = %1d: %6d methods %5.1f%%", i, n, n * 100.0F / _number_of_methods); | |
2794 } | |
2795 assert(tot == _number_of_methods, "should be the same"); | |
2796 tty->print_cr(" %6d methods 100.0%%", _number_of_methods); | |
2797 tty->print_cr("(average parameter size = %3.1f including receiver, if any)", (float)avg / _number_of_methods); | |
2798 } | |
2799 // bytecodes profile | |
2800 tty->cr(); | |
2801 { int tot = 0; | |
2802 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) { | |
2803 if (Bytecodes::is_defined(i)) { | |
2804 Bytecodes::Code c = Bytecodes::cast(i); | |
2805 int n = _bytecodes_profile[c]; | |
2806 tot += n; | |
2807 tty->print_cr("%9d %7.3f%% %s", n, n * 100.0F / _number_of_bytecodes, Bytecodes::name(c)); | |
2808 } | |
2809 } | |
2810 assert(tot == _number_of_bytecodes, "should be the same"); | |
2811 tty->print_cr("%9d 100.000%%", _number_of_bytecodes); | |
2812 } | |
2813 tty->cr(); | |
2814 } | |
2815 }; | |
2816 | |
2817 int MethodStatistics::_number_of_methods; | |
2818 int MethodStatistics::_number_of_final_methods; | |
2819 int MethodStatistics::_number_of_static_methods; | |
2820 int MethodStatistics::_number_of_native_methods; | |
2821 int MethodStatistics::_number_of_synchronized_methods; | |
2822 int MethodStatistics::_number_of_profiled_methods; | |
2823 int MethodStatistics::_number_of_bytecodes; | |
2824 int MethodStatistics::_parameter_size_profile[MethodStatistics::max_parameter_size]; | |
2825 int MethodStatistics::_bytecodes_profile[Bytecodes::number_of_java_codes]; | |
2826 | |
2827 | |
2828 void SystemDictionary::print_method_statistics() { | |
2829 MethodStatistics::print(); | |
2830 } | |
2831 | |
2832 #endif // PRODUCT |