Mercurial > hg > truffle
annotate src/share/vm/classfile/systemDictionary.cpp @ 8866:16885e702c88
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Reviewed-by: kvn, jrose
author | twisti |
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date | Mon, 25 Mar 2013 17:13:26 -0700 |
parents | 1fc4d4768b90 |
children | 0ca3dd0ffaba |
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 |
59 | |
1903 | 60 Dictionary* SystemDictionary::_dictionary = NULL; |
61 PlaceholderTable* SystemDictionary::_placeholders = NULL; | |
62 Dictionary* SystemDictionary::_shared_dictionary = NULL; | |
63 LoaderConstraintTable* SystemDictionary::_loader_constraints = NULL; | |
64 ResolutionErrorTable* SystemDictionary::_resolution_errors = NULL; | |
65 SymbolPropertyTable* SystemDictionary::_invoke_method_table = NULL; | |
0 | 66 |
67 | |
68 int SystemDictionary::_number_of_modifications = 0; | |
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69 int SystemDictionary::_sdgeneration = 0; |
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70 const int SystemDictionary::_primelist[_prime_array_size] = {1009,2017,4049,5051,10103, |
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71 20201,40423,99991}; |
0 | 72 |
73 oop SystemDictionary::_system_loader_lock_obj = NULL; | |
74 | |
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75 Klass* SystemDictionary::_well_known_klasses[SystemDictionary::WKID_LIMIT] |
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76 = { NULL /*, NULL...*/ }; |
0 | 77 |
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78 Klass* SystemDictionary::_box_klasses[T_VOID+1] = { NULL /*, NULL...*/ }; |
0 | 79 |
80 oop SystemDictionary::_java_system_loader = NULL; | |
81 | |
82 bool SystemDictionary::_has_loadClassInternal = false; | |
83 bool SystemDictionary::_has_checkPackageAccess = false; | |
84 | |
85 // lazily initialized klass variables | |
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86 Klass* volatile SystemDictionary::_abstract_ownable_synchronizer_klass = NULL; |
0 | 87 |
88 | |
89 // ---------------------------------------------------------------------------- | |
90 // Java-level SystemLoader | |
91 | |
92 oop SystemDictionary::java_system_loader() { | |
93 return _java_system_loader; | |
94 } | |
95 | |
96 void SystemDictionary::compute_java_system_loader(TRAPS) { | |
1142 | 97 KlassHandle system_klass(THREAD, WK_KLASS(ClassLoader_klass)); |
0 | 98 JavaValue result(T_OBJECT); |
99 JavaCalls::call_static(&result, | |
1142 | 100 KlassHandle(THREAD, WK_KLASS(ClassLoader_klass)), |
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101 vmSymbols::getSystemClassLoader_name(), |
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102 vmSymbols::void_classloader_signature(), |
0 | 103 CHECK); |
104 | |
105 _java_system_loader = (oop)result.get_jobject(); | |
106 } | |
107 | |
108 | |
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109 ClassLoaderData* SystemDictionary::register_loader(Handle class_loader, TRAPS) { |
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110 if (class_loader() == NULL) return ClassLoaderData::the_null_class_loader_data(); |
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111 return ClassLoaderDataGraph::find_or_create(class_loader, CHECK_NULL); |
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112 } |
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113 |
0 | 114 // ---------------------------------------------------------------------------- |
115 // debugging | |
116 | |
117 #ifdef ASSERT | |
118 | |
119 // return true if class_name contains no '.' (internal format is '/') | |
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120 bool SystemDictionary::is_internal_format(Symbol* class_name) { |
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121 if (class_name != NULL) { |
0 | 122 ResourceMark rm; |
123 char* name = class_name->as_C_string(); | |
124 return strchr(name, '.') == NULL; | |
125 } else { | |
126 return true; | |
127 } | |
128 } | |
129 | |
130 #endif | |
131 | |
132 // ---------------------------------------------------------------------------- | |
514 | 133 // Parallel class loading check |
134 | |
135 bool SystemDictionary::is_parallelCapable(Handle class_loader) { | |
136 if (UnsyncloadClass || class_loader.is_null()) return true; | |
137 if (AlwaysLockClassLoader) return false; | |
3938 | 138 return java_lang_ClassLoader::parallelCapable(class_loader()); |
514 | 139 } |
140 // ---------------------------------------------------------------------------- | |
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141 // ParallelDefineClass flag does not apply to bootclass loader |
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142 bool SystemDictionary::is_parallelDefine(Handle class_loader) { |
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143 if (class_loader.is_null()) return false; |
3938 | 144 if (AllowParallelDefineClass && java_lang_ClassLoader::parallelCapable(class_loader())) { |
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145 return true; |
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146 } |
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147 return false; |
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148 } |
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149 |
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150 /** |
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151 * Returns true if the passed class loader is the extension class loader. |
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152 */ |
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153 bool SystemDictionary::is_ext_class_loader(Handle class_loader) { |
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154 if (class_loader.is_null()) { |
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155 return false; |
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156 } |
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157 return (class_loader->klass()->name() == vmSymbols::sun_misc_Launcher_ExtClassLoader()); |
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158 } |
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159 |
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160 // ---------------------------------------------------------------------------- |
0 | 161 // Resolving of classes |
162 | |
163 // Forwards to resolve_or_null | |
164 | |
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165 Klass* SystemDictionary::resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS) { |
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166 Klass* klass = resolve_or_null(class_name, class_loader, protection_domain, THREAD); |
0 | 167 if (HAS_PENDING_EXCEPTION || klass == NULL) { |
168 KlassHandle k_h(THREAD, klass); | |
169 // can return a null klass | |
170 klass = handle_resolution_exception(class_name, class_loader, protection_domain, throw_error, k_h, THREAD); | |
171 } | |
172 return klass; | |
173 } | |
174 | |
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175 Klass* SystemDictionary::handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS) { |
0 | 176 if (HAS_PENDING_EXCEPTION) { |
177 // If we have a pending exception we forward it to the caller, unless throw_error is true, | |
178 // in which case we have to check whether the pending exception is a ClassNotFoundException, | |
179 // and if so convert it to a NoClassDefFoundError | |
180 // And chain the original ClassNotFoundException | |
1142 | 181 if (throw_error && PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass())) { |
0 | 182 ResourceMark rm(THREAD); |
183 assert(klass_h() == NULL, "Should not have result with exception pending"); | |
184 Handle e(THREAD, PENDING_EXCEPTION); | |
185 CLEAR_PENDING_EXCEPTION; | |
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186 THROW_MSG_CAUSE_NULL(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string(), e); |
0 | 187 } else { |
188 return NULL; | |
189 } | |
190 } | |
191 // Class not found, throw appropriate error or exception depending on value of throw_error | |
192 if (klass_h() == NULL) { | |
193 ResourceMark rm(THREAD); | |
194 if (throw_error) { | |
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195 THROW_MSG_NULL(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string()); |
0 | 196 } else { |
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197 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), class_name->as_C_string()); |
0 | 198 } |
199 } | |
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200 return (Klass*)klass_h(); |
0 | 201 } |
202 | |
203 | |
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204 Klass* SystemDictionary::resolve_or_fail(Symbol* class_name, |
0 | 205 bool throw_error, TRAPS) |
206 { | |
207 return resolve_or_fail(class_name, Handle(), Handle(), throw_error, THREAD); | |
208 } | |
209 | |
210 | |
211 // Forwards to resolve_instance_class_or_null | |
212 | |
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213 Klass* SystemDictionary::resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS) { |
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214 assert(!THREAD->is_Compiler_thread(), |
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215 err_msg("can not load classes with compiler thread: class=%s, classloader=%s", |
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216 class_name->as_C_string(), |
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217 class_loader.is_null() ? "null" : class_loader->klass()->name()->as_C_string())); |
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218 if (FieldType::is_array(class_name)) { |
0 | 219 return resolve_array_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); |
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220 } else if (FieldType::is_obj(class_name)) { |
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221 ResourceMark rm(THREAD); |
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222 // Ignore wrapping L and ;. |
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223 TempNewSymbol name = SymbolTable::new_symbol(class_name->as_C_string() + 1, |
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224 class_name->utf8_length() - 2, CHECK_NULL); |
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225 return resolve_instance_class_or_null(name, class_loader, protection_domain, CHECK_NULL); |
0 | 226 } else { |
227 return resolve_instance_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); | |
228 } | |
229 } | |
230 | |
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231 Klass* SystemDictionary::resolve_or_null(Symbol* class_name, TRAPS) { |
0 | 232 return resolve_or_null(class_name, Handle(), Handle(), THREAD); |
233 } | |
234 | |
235 // Forwards to resolve_instance_class_or_null | |
236 | |
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237 Klass* SystemDictionary::resolve_array_class_or_null(Symbol* class_name, |
0 | 238 Handle class_loader, |
239 Handle protection_domain, | |
240 TRAPS) { | |
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241 assert(FieldType::is_array(class_name), "must be array"); |
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242 Klass* k = NULL; |
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243 FieldArrayInfo fd; |
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244 // dimension and object_key in FieldArrayInfo are assigned as a side-effect |
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245 // of this call |
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246 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_NULL); |
0 | 247 if (t == T_OBJECT) { |
248 // naked oop "k" is OK here -- we assign back into it | |
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249 k = SystemDictionary::resolve_instance_class_or_null(fd.object_key(), |
0 | 250 class_loader, |
251 protection_domain, | |
252 CHECK_NULL); | |
253 if (k != NULL) { | |
6983 | 254 k = k->array_klass(fd.dimension(), CHECK_NULL); |
0 | 255 } |
256 } else { | |
257 k = Universe::typeArrayKlassObj(t); | |
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258 k = TypeArrayKlass::cast(k)->array_klass(fd.dimension(), CHECK_NULL); |
0 | 259 } |
260 return k; | |
261 } | |
262 | |
263 | |
264 // Must be called for any super-class or super-interface resolution | |
265 // during class definition to allow class circularity checking | |
266 // super-interface callers: | |
267 // parse_interfaces - for defineClass & jvmtiRedefineClasses | |
268 // super-class callers: | |
269 // ClassFileParser - for defineClass & jvmtiRedefineClasses | |
270 // load_shared_class - while loading a class from shared archive | |
514 | 271 // resolve_instance_class_or_null: |
272 // via: handle_parallel_super_load | |
0 | 273 // when resolving a class that has an existing placeholder with |
274 // a saved superclass [i.e. a defineClass is currently in progress] | |
275 // if another thread is trying to resolve the class, it must do | |
276 // super-class checks on its own thread to catch class circularity | |
277 // This last call is critical in class circularity checking for cases | |
278 // where classloading is delegated to different threads and the | |
279 // classloader lock is released. | |
280 // Take the case: Base->Super->Base | |
281 // 1. If thread T1 tries to do a defineClass of class Base | |
282 // resolve_super_or_fail creates placeholder: T1, Base (super Super) | |
283 // 2. resolve_instance_class_or_null does not find SD or placeholder for Super | |
284 // so it tries to load Super | |
285 // 3. If we load the class internally, or user classloader uses same thread | |
286 // loadClassFromxxx or defineClass via parseClassFile Super ... | |
287 // 3.1 resolve_super_or_fail creates placeholder: T1, Super (super Base) | |
288 // 3.3 resolve_instance_class_or_null Base, finds placeholder for Base | |
289 // 3.4 calls resolve_super_or_fail Base | |
290 // 3.5 finds T1,Base -> throws class circularity | |
291 //OR 4. If T2 tries to resolve Super via defineClass Super ... | |
292 // 4.1 resolve_super_or_fail creates placeholder: T2, Super (super Base) | |
293 // 4.2 resolve_instance_class_or_null Base, finds placeholder for Base (super Super) | |
294 // 4.3 calls resolve_super_or_fail Super in parallel on own thread T2 | |
295 // 4.4 finds T2, Super -> throws class circularity | |
296 // Must be called, even if superclass is null, since this is | |
297 // where the placeholder entry is created which claims this | |
298 // thread is loading this class/classloader. | |
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299 Klass* SystemDictionary::resolve_super_or_fail(Symbol* child_name, |
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300 Symbol* class_name, |
0 | 301 Handle class_loader, |
302 Handle protection_domain, | |
303 bool is_superclass, | |
304 TRAPS) { | |
305 // Double-check, if child class is already loaded, just return super-class,interface | |
306 // Don't add a placedholder if already loaded, i.e. already in system dictionary | |
307 // Make sure there's a placeholder for the *child* before resolving. | |
308 // Used as a claim that this thread is currently loading superclass/classloader | |
309 // Used here for ClassCircularity checks and also for heap verification | |
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310 // (every InstanceKlass in the heap needs to be in the system dictionary |
0 | 311 // or have a placeholder). |
312 // Must check ClassCircularity before checking if super class is already loaded | |
313 // | |
314 // We might not already have a placeholder if this child_name was | |
315 // first seen via resolve_from_stream (jni_DefineClass or JVM_DefineClass); | |
316 // the name of the class might not be known until the stream is actually | |
317 // parsed. | |
318 // Bugs 4643874, 4715493 | |
319 // compute_hash can have a safepoint | |
320 | |
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321 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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322 unsigned int d_hash = dictionary()->compute_hash(child_name, loader_data); |
0 | 323 int d_index = dictionary()->hash_to_index(d_hash); |
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324 unsigned int p_hash = placeholders()->compute_hash(child_name, loader_data); |
0 | 325 int p_index = placeholders()->hash_to_index(p_hash); |
326 // can't throw error holding a lock | |
327 bool child_already_loaded = false; | |
328 bool throw_circularity_error = false; | |
329 { | |
330 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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331 Klass* childk = find_class(d_index, d_hash, child_name, loader_data); |
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332 Klass* quicksuperk; |
0 | 333 // to support // loading: if child done loading, just return superclass |
334 // if class_name, & class_loader don't match: | |
335 // if initial define, SD update will give LinkageError | |
336 // if redefine: compare_class_versions will give HIERARCHY_CHANGED | |
337 // so we don't throw an exception here. | |
338 // see: nsk redefclass014 & java.lang.instrument Instrument032 | |
339 if ((childk != NULL ) && (is_superclass) && | |
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340 ((quicksuperk = InstanceKlass::cast(childk)->super()) != NULL) && |
0 | 341 |
6983 | 342 ((quicksuperk->name() == class_name) && |
343 (quicksuperk->class_loader() == class_loader()))) { | |
0 | 344 return quicksuperk; |
345 } else { | |
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346 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, loader_data); |
0 | 347 if (probe && probe->check_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER)) { |
348 throw_circularity_error = true; | |
349 } | |
514 | 350 } |
351 if (!throw_circularity_error) { | |
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352 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, child_name, loader_data, PlaceholderTable::LOAD_SUPER, class_name, THREAD); |
0 | 353 } |
354 } | |
355 if (throw_circularity_error) { | |
356 ResourceMark rm(THREAD); | |
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357 THROW_MSG_NULL(vmSymbols::java_lang_ClassCircularityError(), child_name->as_C_string()); |
0 | 358 } |
359 | |
360 // java.lang.Object should have been found above | |
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361 assert(class_name != NULL, "null super class for resolving"); |
0 | 362 // Resolve the super class or interface, check results on return |
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363 Klass* superk = SystemDictionary::resolve_or_null(class_name, |
0 | 364 class_loader, |
365 protection_domain, | |
366 THREAD); | |
367 | |
368 KlassHandle superk_h(THREAD, superk); | |
369 | |
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370 // Clean up of placeholders moved so that each classloadAction registrar self-cleans up |
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371 // It is no longer necessary to keep the placeholder table alive until update_dictionary |
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372 // or error. GC used to walk the placeholder table as strong roots. |
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373 // The instanceKlass is kept alive because the class loader is on the stack, |
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374 // which keeps the loader_data alive, as well as all instanceKlasses in |
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375 // the loader_data. parseClassFile adds the instanceKlass to loader_data. |
0 | 376 { |
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377 MutexLocker mu(SystemDictionary_lock, THREAD); |
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378 placeholders()->find_and_remove(p_index, p_hash, child_name, loader_data, PlaceholderTable::LOAD_SUPER, THREAD); |
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379 SystemDictionary_lock->notify_all(); |
0 | 380 } |
381 if (HAS_PENDING_EXCEPTION || superk_h() == NULL) { | |
382 // can null superk | |
383 superk_h = KlassHandle(THREAD, handle_resolution_exception(class_name, class_loader, protection_domain, true, superk_h, THREAD)); | |
384 } | |
385 | |
386 return superk_h(); | |
387 } | |
388 | |
389 void SystemDictionary::validate_protection_domain(instanceKlassHandle klass, | |
390 Handle class_loader, | |
391 Handle protection_domain, | |
392 TRAPS) { | |
393 if(!has_checkPackageAccess()) return; | |
394 | |
395 // Now we have to call back to java to check if the initating class has access | |
396 JavaValue result(T_VOID); | |
397 if (TraceProtectionDomainVerification) { | |
398 // Print out trace information | |
399 tty->print_cr("Checking package access"); | |
400 tty->print(" - class loader: "); class_loader()->print_value_on(tty); tty->cr(); | |
401 tty->print(" - protection domain: "); protection_domain()->print_value_on(tty); tty->cr(); | |
402 tty->print(" - loading: "); klass()->print_value_on(tty); tty->cr(); | |
403 } | |
404 | |
1142 | 405 KlassHandle system_loader(THREAD, SystemDictionary::ClassLoader_klass()); |
0 | 406 JavaCalls::call_special(&result, |
407 class_loader, | |
408 system_loader, | |
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409 vmSymbols::checkPackageAccess_name(), |
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410 vmSymbols::class_protectiondomain_signature(), |
0 | 411 Handle(THREAD, klass->java_mirror()), |
412 protection_domain, | |
413 THREAD); | |
414 | |
415 if (TraceProtectionDomainVerification) { | |
416 if (HAS_PENDING_EXCEPTION) { | |
417 tty->print_cr(" -> DENIED !!!!!!!!!!!!!!!!!!!!!"); | |
418 } else { | |
419 tty->print_cr(" -> granted"); | |
420 } | |
421 tty->cr(); | |
422 } | |
423 | |
424 if (HAS_PENDING_EXCEPTION) return; | |
425 | |
426 // If no exception has been thrown, we have validated the protection domain | |
427 // Insert the protection domain of the initiating class into the set. | |
428 { | |
429 // We recalculate the entry here -- we've called out to java since | |
430 // the last time it was calculated. | |
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431 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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432 |
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433 Symbol* kn = klass->name(); |
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434 unsigned int d_hash = dictionary()->compute_hash(kn, loader_data); |
0 | 435 int d_index = dictionary()->hash_to_index(d_hash); |
436 | |
437 MutexLocker mu(SystemDictionary_lock, THREAD); | |
438 { | |
439 // Note that we have an entry, and entries can be deleted only during GC, | |
440 // so we cannot allow GC to occur while we're holding this entry. | |
441 | |
442 // We're using a No_Safepoint_Verifier to catch any place where we | |
443 // might potentially do a GC at all. | |
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444 // Dictionary::do_unloading() asserts that classes in SD are only |
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445 // unloaded at a safepoint. Anonymous classes are not in SD. |
0 | 446 No_Safepoint_Verifier nosafepoint; |
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447 dictionary()->add_protection_domain(d_index, d_hash, klass, loader_data, |
0 | 448 protection_domain, THREAD); |
449 } | |
450 } | |
451 } | |
452 | |
453 // We only get here if this thread finds that another thread | |
454 // has already claimed the placeholder token for the current operation, | |
455 // but that other thread either never owned or gave up the | |
456 // object lock | |
457 // Waits on SystemDictionary_lock to indicate placeholder table updated | |
458 // On return, caller must recheck placeholder table state | |
459 // | |
460 // We only get here if | |
461 // 1) custom classLoader, i.e. not bootstrap classloader | |
462 // 2) UnsyncloadClass not set | |
463 // 3) custom classLoader has broken the class loader objectLock | |
464 // so another thread got here in parallel | |
465 // | |
466 // lockObject must be held. | |
467 // Complicated dance due to lock ordering: | |
468 // Must first release the classloader object lock to | |
469 // allow initial definer to complete the class definition | |
470 // and to avoid deadlock | |
471 // Reclaim classloader lock object with same original recursion count | |
472 // Must release SystemDictionary_lock after notify, since | |
473 // class loader lock must be claimed before SystemDictionary_lock | |
474 // to prevent deadlocks | |
475 // | |
476 // The notify allows applications that did an untimed wait() on | |
477 // the classloader object lock to not hang. | |
478 void SystemDictionary::double_lock_wait(Handle lockObject, TRAPS) { | |
479 assert_lock_strong(SystemDictionary_lock); | |
480 | |
481 bool calledholdinglock | |
482 = ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, lockObject); | |
483 assert(calledholdinglock,"must hold lock for notify"); | |
514 | 484 assert((!(lockObject() == _system_loader_lock_obj) && !is_parallelCapable(lockObject)), "unexpected double_lock_wait"); |
0 | 485 ObjectSynchronizer::notifyall(lockObject, THREAD); |
486 intptr_t recursions = ObjectSynchronizer::complete_exit(lockObject, THREAD); | |
487 SystemDictionary_lock->wait(); | |
488 SystemDictionary_lock->unlock(); | |
489 ObjectSynchronizer::reenter(lockObject, recursions, THREAD); | |
490 SystemDictionary_lock->lock(); | |
491 } | |
492 | |
493 // If the class in is in the placeholder table, class loading is in progress | |
494 // For cases where the application changes threads to load classes, it | |
495 // is critical to ClassCircularity detection that we try loading | |
496 // the superclass on the same thread internally, so we do parallel | |
497 // super class loading here. | |
498 // This also is critical in cases where the original thread gets stalled | |
499 // even in non-circularity situations. | |
500 // Note: must call resolve_super_or_fail even if null super - | |
514 | 501 // to force placeholder entry creation for this class for circularity detection |
0 | 502 // Caller must check for pending exception |
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503 // Returns non-null Klass* if other thread has completed load |
0 | 504 // and we are done, |
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505 // If return null Klass* and no pending exception, the caller must load the class |
0 | 506 instanceKlassHandle SystemDictionary::handle_parallel_super_load( |
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507 Symbol* name, Symbol* superclassname, Handle class_loader, |
0 | 508 Handle protection_domain, Handle lockObject, TRAPS) { |
509 | |
510 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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511 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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512 unsigned int d_hash = dictionary()->compute_hash(name, loader_data); |
0 | 513 int d_index = dictionary()->hash_to_index(d_hash); |
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514 unsigned int p_hash = placeholders()->compute_hash(name, loader_data); |
0 | 515 int p_index = placeholders()->hash_to_index(p_hash); |
516 | |
517 // superk is not used, resolve_super called for circularity check only | |
518 // This code is reached in two situations. One if this thread | |
519 // is loading the same class twice (e.g. ClassCircularity, or | |
520 // java.lang.instrument). | |
521 // The second is if another thread started the resolve_super first | |
522 // and has not yet finished. | |
523 // In both cases the original caller will clean up the placeholder | |
524 // entry on error. | |
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525 Klass* superk = SystemDictionary::resolve_super_or_fail(name, |
0 | 526 superclassname, |
527 class_loader, | |
528 protection_domain, | |
529 true, | |
530 CHECK_(nh)); | |
531 | |
514 | 532 // parallelCapable class loaders do NOT wait for parallel superclass loads to complete |
533 // Serial class loaders and bootstrap classloader do wait for superclass loads | |
534 if (!class_loader.is_null() && is_parallelCapable(class_loader)) { | |
0 | 535 MutexLocker mu(SystemDictionary_lock, THREAD); |
536 // Check if classloading completed while we were loading superclass or waiting | |
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537 Klass* check = find_class(d_index, d_hash, name, loader_data); |
0 | 538 if (check != NULL) { |
539 // Klass is already loaded, so just return it | |
540 return(instanceKlassHandle(THREAD, check)); | |
541 } else { | |
542 return nh; | |
543 } | |
544 } | |
545 | |
546 // must loop to both handle other placeholder updates | |
547 // and spurious notifications | |
548 bool super_load_in_progress = true; | |
549 PlaceholderEntry* placeholder; | |
550 while (super_load_in_progress) { | |
551 MutexLocker mu(SystemDictionary_lock, THREAD); | |
552 // Check if classloading completed while we were loading superclass or waiting | |
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553 Klass* check = find_class(d_index, d_hash, name, loader_data); |
0 | 554 if (check != NULL) { |
555 // Klass is already loaded, so just return it | |
556 return(instanceKlassHandle(THREAD, check)); | |
557 } else { | |
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558 placeholder = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
0 | 559 if (placeholder && placeholder->super_load_in_progress() ){ |
560 // Before UnsyncloadClass: | |
561 // We only get here if the application has released the | |
562 // classloader lock when another thread was in the middle of loading a | |
563 // superclass/superinterface for this class, and now | |
564 // this thread is also trying to load this class. | |
565 // To minimize surprises, the first thread that started to | |
566 // load a class should be the one to complete the loading | |
567 // with the classfile it initially expected. | |
568 // This logic has the current thread wait once it has done | |
569 // all the superclass/superinterface loading it can, until | |
570 // the original thread completes the class loading or fails | |
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571 // If it completes we will use the resulting InstanceKlass |
0 | 572 // which we will find below in the systemDictionary. |
573 // We also get here for parallel bootstrap classloader | |
574 if (class_loader.is_null()) { | |
575 SystemDictionary_lock->wait(); | |
576 } else { | |
577 double_lock_wait(lockObject, THREAD); | |
578 } | |
579 } else { | |
580 // If not in SD and not in PH, other thread's load must have failed | |
581 super_load_in_progress = false; | |
582 } | |
583 } | |
584 } | |
585 return (nh); | |
586 } | |
587 | |
588 | |
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589 Klass* SystemDictionary::resolve_instance_class_or_null(Symbol* name, Handle class_loader, Handle protection_domain, TRAPS) { |
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590 assert(name != NULL && !FieldType::is_array(name) && |
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591 !FieldType::is_obj(name), "invalid class name"); |
0 | 592 |
593 // UseNewReflection | |
594 // Fix for 4474172; see evaluation for more details | |
595 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); | |
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596 ClassLoaderData *loader_data = register_loader(class_loader, CHECK_NULL); |
0 | 597 |
598 // Do lookup to see if class already exist and the protection domain | |
599 // has the right access | |
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600 // This call uses find which checks protection domain already matches |
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601 // All subsequent calls use find_class, and set has_loaded_class so that |
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602 // before we return a result we call out to java to check for valid protection domain |
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603 // to allow returning the Klass* and add it to the pd_set if it is valid |
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604 unsigned int d_hash = dictionary()->compute_hash(name, loader_data); |
0 | 605 int d_index = dictionary()->hash_to_index(d_hash); |
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606 Klass* probe = dictionary()->find(d_index, d_hash, name, loader_data, |
0 | 607 protection_domain, THREAD); |
608 if (probe != NULL) return probe; | |
609 | |
610 | |
611 // Non-bootstrap class loaders will call out to class loader and | |
612 // define via jvm/jni_DefineClass which will acquire the | |
613 // class loader object lock to protect against multiple threads | |
614 // defining the class in parallel by accident. | |
615 // This lock must be acquired here so the waiter will find | |
616 // any successful result in the SystemDictionary and not attempt | |
617 // the define | |
514 | 618 // ParallelCapable Classloaders and the bootstrap classloader, |
0 | 619 // or all classloaders with UnsyncloadClass do not acquire lock here |
620 bool DoObjectLock = true; | |
514 | 621 if (is_parallelCapable(class_loader)) { |
0 | 622 DoObjectLock = false; |
623 } | |
624 | |
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625 unsigned int p_hash = placeholders()->compute_hash(name, loader_data); |
0 | 626 int p_index = placeholders()->hash_to_index(p_hash); |
627 | |
628 // Class is not in SystemDictionary so we have to do loading. | |
629 // Make sure we are synchronized on the class loader before we proceed | |
630 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
631 check_loader_lock_contention(lockObject, THREAD); | |
632 ObjectLocker ol(lockObject, THREAD, DoObjectLock); | |
633 | |
634 // Check again (after locking) if class already exist in SystemDictionary | |
635 bool class_has_been_loaded = false; | |
636 bool super_load_in_progress = false; | |
637 bool havesupername = false; | |
638 instanceKlassHandle k; | |
639 PlaceholderEntry* placeholder; | |
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640 Symbol* superclassname = NULL; |
0 | 641 |
642 { | |
643 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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644 Klass* check = find_class(d_index, d_hash, name, loader_data); |
0 | 645 if (check != NULL) { |
646 // Klass is already loaded, so just return it | |
647 class_has_been_loaded = true; | |
648 k = instanceKlassHandle(THREAD, check); | |
649 } else { | |
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650 placeholder = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
0 | 651 if (placeholder && placeholder->super_load_in_progress()) { |
652 super_load_in_progress = true; | |
653 if (placeholder->havesupername() == true) { | |
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654 superclassname = placeholder->supername(); |
0 | 655 havesupername = true; |
656 } | |
657 } | |
658 } | |
659 } | |
660 | |
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661 // If the class is in the placeholder table, class loading is in progress |
0 | 662 if (super_load_in_progress && havesupername==true) { |
663 k = SystemDictionary::handle_parallel_super_load(name, superclassname, | |
664 class_loader, protection_domain, lockObject, THREAD); | |
665 if (HAS_PENDING_EXCEPTION) { | |
666 return NULL; | |
667 } | |
668 if (!k.is_null()) { | |
669 class_has_been_loaded = true; | |
670 } | |
671 } | |
672 | |
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673 bool throw_circularity_error = false; |
0 | 674 if (!class_has_been_loaded) { |
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675 bool load_instance_added = false; |
0 | 676 |
677 // add placeholder entry to record loading instance class | |
678 // Five cases: | |
679 // All cases need to prevent modifying bootclasssearchpath | |
680 // in parallel with a classload of same classname | |
514 | 681 // Redefineclasses uses existence of the placeholder for the duration |
682 // of the class load to prevent concurrent redefinition of not completely | |
683 // defined classes. | |
0 | 684 // case 1. traditional classloaders that rely on the classloader object lock |
685 // - no other need for LOAD_INSTANCE | |
686 // case 2. traditional classloaders that break the classloader object lock | |
687 // as a deadlock workaround. Detection of this case requires that | |
688 // this check is done while holding the classloader object lock, | |
689 // and that lock is still held when calling classloader's loadClass. | |
690 // For these classloaders, we ensure that the first requestor | |
691 // completes the load and other requestors wait for completion. | |
692 // case 3. UnsyncloadClass - don't use objectLocker | |
693 // With this flag, we allow parallel classloading of a | |
694 // class/classloader pair | |
695 // case4. Bootstrap classloader - don't own objectLocker | |
696 // This classloader supports parallelism at the classloader level, | |
697 // but only allows a single load of a class/classloader pair. | |
698 // No performance benefit and no deadlock issues. | |
514 | 699 // case 5. parallelCapable user level classloaders - without objectLocker |
700 // Allow parallel classloading of a class/classloader pair | |
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701 |
0 | 702 { |
703 MutexLocker mu(SystemDictionary_lock, THREAD); | |
514 | 704 if (class_loader.is_null() || !is_parallelCapable(class_loader)) { |
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705 PlaceholderEntry* oldprobe = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
0 | 706 if (oldprobe) { |
707 // only need check_seen_thread once, not on each loop | |
708 // 6341374 java/lang/Instrument with -Xcomp | |
709 if (oldprobe->check_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE)) { | |
710 throw_circularity_error = true; | |
711 } else { | |
712 // case 1: traditional: should never see load_in_progress. | |
713 while (!class_has_been_loaded && oldprobe && oldprobe->instance_load_in_progress()) { | |
714 | |
715 // case 4: bootstrap classloader: prevent futile classloading, | |
716 // wait on first requestor | |
717 if (class_loader.is_null()) { | |
718 SystemDictionary_lock->wait(); | |
719 } else { | |
720 // case 2: traditional with broken classloader lock. wait on first | |
721 // requestor. | |
722 double_lock_wait(lockObject, THREAD); | |
723 } | |
724 // Check if classloading completed while we were waiting | |
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725 Klass* check = find_class(d_index, d_hash, name, loader_data); |
0 | 726 if (check != NULL) { |
727 // Klass is already loaded, so just return it | |
728 k = instanceKlassHandle(THREAD, check); | |
729 class_has_been_loaded = true; | |
730 } | |
731 // check if other thread failed to load and cleaned up | |
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732 oldprobe = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
0 | 733 } |
734 } | |
735 } | |
736 } | |
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737 // All cases: add LOAD_INSTANCE holding SystemDictionary_lock |
514 | 738 // case 3: UnsyncloadClass || case 5: parallelCapable: allow competing threads to try |
0 | 739 // LOAD_INSTANCE in parallel |
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740 |
514 | 741 if (!throw_circularity_error && !class_has_been_loaded) { |
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742 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, name, loader_data, PlaceholderTable::LOAD_INSTANCE, NULL, THREAD); |
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743 load_instance_added = true; |
0 | 744 // For class loaders that do not acquire the classloader object lock, |
745 // if they did not catch another thread holding LOAD_INSTANCE, | |
746 // need a check analogous to the acquire ObjectLocker/find_class | |
747 // i.e. now that we hold the LOAD_INSTANCE token on loading this class/CL | |
748 // one final check if the load has already completed | |
514 | 749 // class loaders holding the ObjectLock shouldn't find the class here |
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750 Klass* check = find_class(d_index, d_hash, name, loader_data); |
0 | 751 if (check != NULL) { |
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752 // Klass is already loaded, so return it after checking/adding protection domain |
0 | 753 k = instanceKlassHandle(THREAD, check); |
754 class_has_been_loaded = true; | |
755 } | |
756 } | |
757 } | |
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758 |
0 | 759 // must throw error outside of owning lock |
760 if (throw_circularity_error) { | |
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761 assert(!HAS_PENDING_EXCEPTION && load_instance_added == false,"circularity error cleanup"); |
0 | 762 ResourceMark rm(THREAD); |
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763 THROW_MSG_NULL(vmSymbols::java_lang_ClassCircularityError(), name->as_C_string()); |
0 | 764 } |
765 | |
766 if (!class_has_been_loaded) { | |
767 | |
768 // Do actual loading | |
769 k = load_instance_class(name, class_loader, THREAD); | |
770 | |
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771 // For UnsyncloadClass only |
0 | 772 // If they got a linkageError, check if a parallel class load succeeded. |
773 // If it did, then for bytecode resolution the specification requires | |
774 // that we return the same result we did for the other thread, i.e. the | |
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775 // successfully loaded InstanceKlass |
0 | 776 // Should not get here for classloaders that support parallelism |
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777 // with the new cleaner mechanism, even with AllowParallelDefineClass |
514 | 778 // Bootstrap goes through here to allow for an extra guarantee check |
0 | 779 if (UnsyncloadClass || (class_loader.is_null())) { |
780 if (k.is_null() && HAS_PENDING_EXCEPTION | |
1142 | 781 && PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { |
0 | 782 MutexLocker mu(SystemDictionary_lock, THREAD); |
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783 Klass* check = find_class(d_index, d_hash, name, loader_data); |
0 | 784 if (check != NULL) { |
785 // Klass is already loaded, so just use it | |
786 k = instanceKlassHandle(THREAD, check); | |
787 CLEAR_PENDING_EXCEPTION; | |
788 guarantee((!class_loader.is_null()), "dup definition for bootstrap loader?"); | |
789 } | |
790 } | |
791 } | |
792 | |
793 // If everything was OK (no exceptions, no null return value), and | |
794 // class_loader is NOT the defining loader, do a little more bookkeeping. | |
795 if (!HAS_PENDING_EXCEPTION && !k.is_null() && | |
796 k->class_loader() != class_loader()) { | |
797 | |
798 check_constraints(d_index, d_hash, k, class_loader, false, THREAD); | |
799 | |
800 // Need to check for a PENDING_EXCEPTION again; check_constraints | |
801 // can throw and doesn't use the CHECK macro. | |
802 if (!HAS_PENDING_EXCEPTION) { | |
803 { // Grabbing the Compile_lock prevents systemDictionary updates | |
804 // during compilations. | |
805 MutexLocker mu(Compile_lock, THREAD); | |
806 update_dictionary(d_index, d_hash, p_index, p_hash, | |
807 k, class_loader, THREAD); | |
808 } | |
809 if (JvmtiExport::should_post_class_load()) { | |
810 Thread *thread = THREAD; | |
811 assert(thread->is_Java_thread(), "thread->is_Java_thread()"); | |
812 JvmtiExport::post_class_load((JavaThread *) thread, k()); | |
813 } | |
814 } | |
815 } | |
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816 } // load_instance_class loop |
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817 |
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818 if (HAS_PENDING_EXCEPTION) { |
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819 // An exception, such as OOM could have happened at various places inside |
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820 // load_instance_class. We might have partially initialized a shared class |
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821 // and need to clean it up. |
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822 if (class_loader.is_null()) { |
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823 // In some cases k may be null. Let's find the shared class again. |
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824 instanceKlassHandle ik(THREAD, find_shared_class(name)); |
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825 if (ik.not_null()) { |
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826 if (ik->class_loader_data() == NULL) { |
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827 // We didn't go as far as Klass::restore_unshareable_info(), |
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828 // so nothing to clean up. |
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829 } else { |
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830 MutexLocker mu(SystemDictionary_lock, THREAD); |
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831 Klass* kk = find_class(name, ik->class_loader_data()); |
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832 if (kk != NULL) { |
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833 // No clean up is needed if the shared class has been entered |
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834 // into system dictionary, as load_shared_class() won't be called |
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835 // again. |
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836 } else { |
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837 clean_up_shared_class(ik, class_loader, THREAD); |
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838 } |
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839 } |
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840 } |
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841 } |
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842 } |
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843 |
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844 if (load_instance_added == true) { |
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845 // clean up placeholder entries for LOAD_INSTANCE success or error |
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846 // This brackets the SystemDictionary updates for both defining |
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847 // and initiating loaders |
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848 MutexLocker mu(SystemDictionary_lock, THREAD); |
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849 placeholders()->find_and_remove(p_index, p_hash, name, loader_data, PlaceholderTable::LOAD_INSTANCE, THREAD); |
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850 SystemDictionary_lock->notify_all(); |
0 | 851 } |
852 } | |
853 | |
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854 if (HAS_PENDING_EXCEPTION || k.is_null()) { |
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855 return NULL; |
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856 } |
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857 |
0 | 858 #ifdef ASSERT |
859 { | |
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860 ClassLoaderData* loader_data = k->class_loader_data(); |
0 | 861 MutexLocker mu(SystemDictionary_lock, THREAD); |
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862 Klass* kk = find_class(name, loader_data); |
0 | 863 assert(kk == k(), "should be present in dictionary"); |
864 } | |
865 #endif | |
866 | |
867 // return if the protection domain in NULL | |
868 if (protection_domain() == NULL) return k(); | |
869 | |
870 // Check the protection domain has the right access | |
871 { | |
872 MutexLocker mu(SystemDictionary_lock, THREAD); | |
873 // Note that we have an entry, and entries can be deleted only during GC, | |
874 // so we cannot allow GC to occur while we're holding this entry. | |
875 // We're using a No_Safepoint_Verifier to catch any place where we | |
876 // might potentially do a GC at all. | |
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877 // Dictionary::do_unloading() asserts that classes in SD are only |
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878 // unloaded at a safepoint. Anonymous classes are not in SD. |
0 | 879 No_Safepoint_Verifier nosafepoint; |
880 if (dictionary()->is_valid_protection_domain(d_index, d_hash, name, | |
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881 loader_data, |
0 | 882 protection_domain)) { |
883 return k(); | |
884 } | |
885 } | |
886 | |
887 // Verify protection domain. If it fails an exception is thrown | |
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888 validate_protection_domain(k, class_loader, protection_domain, CHECK_NULL); |
0 | 889 |
890 return k(); | |
891 } | |
892 | |
893 | |
894 // This routine does not lock the system dictionary. | |
895 // | |
896 // Since readers don't hold a lock, we must make sure that system | |
897 // dictionary entries are only removed at a safepoint (when only one | |
898 // thread is running), and are added to in a safe way (all links must | |
899 // be updated in an MT-safe manner). | |
900 // | |
901 // Callers should be aware that an entry could be added just after | |
902 // _dictionary->bucket(index) is read here, so the caller will not see | |
903 // the new entry. | |
904 | |
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905 Klass* SystemDictionary::find(Symbol* class_name, |
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906 Handle class_loader, |
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907 Handle protection_domain, |
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908 TRAPS) { |
0 | 909 |
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910 // UseNewReflection |
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911 // The result of this call should be consistent with the result |
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912 // of the call to resolve_instance_class_or_null(). |
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913 // See evaluation 6790209 and 4474172 for more details. |
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914 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); |
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915 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data_or_null(class_loader()); |
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916 |
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917 if (loader_data == NULL) { |
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918 // If the ClassLoaderData has not been setup, |
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919 // then the class loader has no entries in the dictionary. |
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920 return NULL; |
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921 } |
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922 |
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923 unsigned int d_hash = dictionary()->compute_hash(class_name, loader_data); |
0 | 924 int d_index = dictionary()->hash_to_index(d_hash); |
925 | |
926 { | |
927 // Note that we have an entry, and entries can be deleted only during GC, | |
928 // so we cannot allow GC to occur while we're holding this entry. | |
929 // We're using a No_Safepoint_Verifier to catch any place where we | |
930 // might potentially do a GC at all. | |
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931 // Dictionary::do_unloading() asserts that classes in SD are only |
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932 // unloaded at a safepoint. Anonymous classes are not in SD. |
0 | 933 No_Safepoint_Verifier nosafepoint; |
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934 return dictionary()->find(d_index, d_hash, class_name, loader_data, |
0 | 935 protection_domain, THREAD); |
936 } | |
937 } | |
938 | |
939 | |
940 // Look for a loaded instance or array klass by name. Do not do any loading. | |
941 // return NULL in case of error. | |
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942 Klass* SystemDictionary::find_instance_or_array_klass(Symbol* class_name, |
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943 Handle class_loader, |
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944 Handle protection_domain, |
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945 TRAPS) { |
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946 Klass* k = NULL; |
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947 assert(class_name != NULL, "class name must be non NULL"); |
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948 |
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949 if (FieldType::is_array(class_name)) { |
0 | 950 // The name refers to an array. Parse the name. |
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951 // dimension and object_key in FieldArrayInfo are assigned as a |
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952 // side-effect of this call |
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953 FieldArrayInfo fd; |
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954 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
0 | 955 if (t != T_OBJECT) { |
956 k = Universe::typeArrayKlassObj(t); | |
957 } else { | |
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958 k = SystemDictionary::find(fd.object_key(), class_loader, protection_domain, THREAD); |
0 | 959 } |
960 if (k != NULL) { | |
6983 | 961 k = k->array_klass_or_null(fd.dimension()); |
0 | 962 } |
963 } else { | |
964 k = find(class_name, class_loader, protection_domain, THREAD); | |
965 } | |
966 return k; | |
967 } | |
968 | |
969 // Note: this method is much like resolve_from_stream, but | |
970 // updates no supplemental data structures. | |
971 // TODO consolidate the two methods with a helper routine? | |
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972 Klass* SystemDictionary::parse_stream(Symbol* class_name, |
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973 Handle class_loader, |
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974 Handle protection_domain, |
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975 ClassFileStream* st, |
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976 KlassHandle host_klass, |
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977 GrowableArray<Handle>* cp_patches, |
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978 TRAPS) { |
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979 TempNewSymbol parsed_name = NULL; |
0 | 980 |
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981 ClassLoaderData* loader_data; |
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982 if (host_klass.not_null()) { |
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983 // Create a new CLD for anonymous class, that uses the same class loader |
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984 // as the host_klass |
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985 assert(EnableInvokeDynamic, ""); |
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986 guarantee(host_klass->class_loader() == class_loader(), "should be the same"); |
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987 loader_data = ClassLoaderData::anonymous_class_loader_data(class_loader(), CHECK_NULL); |
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988 loader_data->record_dependency(host_klass(), CHECK_NULL); |
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989 } else { |
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990 loader_data = ClassLoaderData::class_loader_data(class_loader()); |
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991 } |
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992 |
0 | 993 // Parse the stream. Note that we do this even though this klass might |
994 // already be present in the SystemDictionary, otherwise we would not | |
995 // throw potential ClassFormatErrors. | |
996 // | |
997 // Note: "name" is updated. | |
998 | |
999 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
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1000 loader_data, |
0 | 1001 protection_domain, |
710 | 1002 host_klass, |
1003 cp_patches, | |
0 | 1004 parsed_name, |
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1005 true, |
0 | 1006 THREAD); |
1007 | |
1008 | |
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1009 if (host_klass.not_null() && k.not_null()) { |
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1010 assert(EnableInvokeDynamic, ""); |
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1011 k->set_host_klass(host_klass()); |
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1012 // If it's anonymous, initialize it now, since nobody else will. |
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1013 |
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1014 { |
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1015 MutexLocker mu_r(Compile_lock, THREAD); |
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1016 |
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1017 // Add to class hierarchy, initialize vtables, and do possible |
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1018 // deoptimizations. |
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1019 add_to_hierarchy(k, CHECK_NULL); // No exception, but can block |
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1020 |
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1021 // But, do not add to system dictionary. |
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1022 } |
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1023 |
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1024 // Rewrite and patch constant pool here. |
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1025 k->link_class(CHECK_NULL); |
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1026 if (cp_patches != NULL) { |
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1027 k->constants()->patch_resolved_references(cp_patches); |
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1028 } |
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1029 k->eager_initialize(CHECK_NULL); |
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1030 |
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1031 // notify jvmti |
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1032 if (JvmtiExport::should_post_class_load()) { |
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1033 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); |
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1034 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); |
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1035 } |
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1036 } |
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1037 assert(host_klass.not_null() || cp_patches == NULL, |
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1038 "cp_patches only found with host_klass"); |
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1039 |
0 | 1040 return k(); |
1041 } | |
1042 | |
1043 // Add a klass to the system from a stream (called by jni_DefineClass and | |
1044 // JVM_DefineClass). | |
1045 // Note: class_name can be NULL. In that case we do not know the name of | |
1046 // the class until we have parsed the stream. | |
1047 | |
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1048 Klass* SystemDictionary::resolve_from_stream(Symbol* class_name, |
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1049 Handle class_loader, |
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1050 Handle protection_domain, |
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1051 ClassFileStream* st, |
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1052 bool verify, |
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1053 TRAPS) { |
0 | 1054 |
514 | 1055 // Classloaders that support parallelism, e.g. bootstrap classloader, |
1056 // or all classloaders with UnsyncloadClass do not acquire lock here | |
1057 bool DoObjectLock = true; | |
1058 if (is_parallelCapable(class_loader)) { | |
1059 DoObjectLock = false; | |
1060 } | |
1061 | |
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1062 ClassLoaderData* loader_data = register_loader(class_loader, CHECK_NULL); |
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1063 |
514 | 1064 // Make sure we are synchronized on the class loader before we proceed |
0 | 1065 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); |
1066 check_loader_lock_contention(lockObject, THREAD); | |
514 | 1067 ObjectLocker ol(lockObject, THREAD, DoObjectLock); |
0 | 1068 |
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1069 TempNewSymbol parsed_name = NULL; |
0 | 1070 |
1071 // Parse the stream. Note that we do this even though this klass might | |
1072 // already be present in the SystemDictionary, otherwise we would not | |
1073 // throw potential ClassFormatErrors. | |
1074 // | |
1075 // Note: "name" is updated. | |
1076 | |
1077 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
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1078 loader_data, |
0 | 1079 protection_domain, |
1080 parsed_name, | |
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1081 verify, |
0 | 1082 THREAD); |
1083 | |
1084 const char* pkg = "java/"; | |
1085 if (!HAS_PENDING_EXCEPTION && | |
1086 !class_loader.is_null() && | |
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1087 parsed_name != NULL && |
0 | 1088 !strncmp((const char*)parsed_name->bytes(), pkg, strlen(pkg))) { |
1089 // It is illegal to define classes in the "java." package from | |
1090 // JVM_DefineClass or jni_DefineClass unless you're the bootclassloader | |
1091 ResourceMark rm(THREAD); | |
1092 char* name = parsed_name->as_C_string(); | |
1093 char* index = strrchr(name, '/'); | |
1094 *index = '\0'; // chop to just the package name | |
1095 while ((index = strchr(name, '/')) != NULL) { | |
1096 *index = '.'; // replace '/' with '.' in package name | |
1097 } | |
1098 const char* fmt = "Prohibited package name: %s"; | |
1099 size_t len = strlen(fmt) + strlen(name); | |
1100 char* message = NEW_RESOURCE_ARRAY(char, len); | |
1101 jio_snprintf(message, len, fmt, name); | |
1102 Exceptions::_throw_msg(THREAD_AND_LOCATION, | |
1103 vmSymbols::java_lang_SecurityException(), message); | |
1104 } | |
1105 | |
1106 if (!HAS_PENDING_EXCEPTION) { | |
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1107 assert(parsed_name != NULL, "Sanity"); |
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1108 assert(class_name == NULL || class_name == parsed_name, "name mismatch"); |
0 | 1109 // Verification prevents us from creating names with dots in them, this |
1110 // asserts that that's the case. | |
1111 assert(is_internal_format(parsed_name), | |
1112 "external class name format used internally"); | |
1113 | |
1114 // Add class just loaded | |
514 | 1115 // If a class loader supports parallel classloading handle parallel define requests |
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1116 // find_or_define_instance_class may return a different InstanceKlass |
514 | 1117 if (is_parallelCapable(class_loader)) { |
1118 k = find_or_define_instance_class(class_name, class_loader, k, THREAD); | |
1119 } else { | |
1120 define_instance_class(k, THREAD); | |
1121 } | |
0 | 1122 } |
1123 | |
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1124 // Make sure we have an entry in the SystemDictionary on success |
0 | 1125 debug_only( { |
1126 if (!HAS_PENDING_EXCEPTION) { | |
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1127 assert(parsed_name != NULL, "parsed_name is still null?"); |
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1128 Symbol* h_name = k->name(); |
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1129 ClassLoaderData *defining_loader_data = k->class_loader_data(); |
0 | 1130 |
1131 MutexLocker mu(SystemDictionary_lock, THREAD); | |
1132 | |
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1133 Klass* check = find_class(parsed_name, loader_data); |
0 | 1134 assert(check == k(), "should be present in the dictionary"); |
1135 | |
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1136 Klass* check2 = find_class(h_name, defining_loader_data); |
0 | 1137 assert(check == check2, "name inconsistancy in SystemDictionary"); |
1138 } | |
1139 } ); | |
1140 | |
1141 return k(); | |
1142 } | |
1143 | |
1144 | |
6197 | 1145 void SystemDictionary::set_shared_dictionary(HashtableBucket<mtClass>* t, int length, |
0 | 1146 int number_of_entries) { |
6197 | 1147 assert(length == _nof_buckets * sizeof(HashtableBucket<mtClass>), |
0 | 1148 "bad shared dictionary size."); |
1149 _shared_dictionary = new Dictionary(_nof_buckets, t, number_of_entries); | |
1150 } | |
1151 | |
1152 | |
1153 // If there is a shared dictionary, then find the entry for the | |
1154 // given shared system class, if any. | |
1155 | |
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1156 Klass* SystemDictionary::find_shared_class(Symbol* class_name) { |
0 | 1157 if (shared_dictionary() != NULL) { |
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1158 unsigned int d_hash = shared_dictionary()->compute_hash(class_name, NULL); |
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1159 int d_index = shared_dictionary()->hash_to_index(d_hash); |
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1160 |
0 | 1161 return shared_dictionary()->find_shared_class(d_index, d_hash, class_name); |
1162 } else { | |
1163 return NULL; | |
1164 } | |
1165 } | |
1166 | |
1167 | |
1168 // Load a class from the shared spaces (found through the shared system | |
1169 // dictionary). Force the superclass and all interfaces to be loaded. | |
1170 // Update the class definition to include sibling classes and no | |
1171 // subclasses (yet). [Classes in the shared space are not part of the | |
1172 // object hierarchy until loaded.] | |
1173 | |
1174 instanceKlassHandle SystemDictionary::load_shared_class( | |
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1175 Symbol* class_name, Handle class_loader, TRAPS) { |
0 | 1176 instanceKlassHandle ik (THREAD, find_shared_class(class_name)); |
1177 return load_shared_class(ik, class_loader, THREAD); | |
1178 } | |
1179 | |
1180 instanceKlassHandle SystemDictionary::load_shared_class( | |
1181 instanceKlassHandle ik, Handle class_loader, TRAPS) { | |
1182 assert(class_loader.is_null(), "non-null classloader for shared class?"); | |
1183 if (ik.not_null()) { | |
1184 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1185 Symbol* class_name = ik->name(); |
0 | 1186 |
1187 // Found the class, now load the superclass and interfaces. If they | |
1188 // are shared, add them to the main system dictionary and reset | |
1189 // their hierarchy references (supers, subs, and interfaces). | |
1190 | |
1191 if (ik->super() != NULL) { | |
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1192 Symbol* cn = ik->super()->name(); |
0 | 1193 resolve_super_or_fail(class_name, cn, |
1194 class_loader, Handle(), true, CHECK_(nh)); | |
1195 } | |
1196 | |
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1197 Array<Klass*>* interfaces = ik->local_interfaces(); |
0 | 1198 int num_interfaces = interfaces->length(); |
1199 for (int index = 0; index < num_interfaces; index++) { | |
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1200 Klass* k = interfaces->at(index); |
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1201 |
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1202 // Note: can not use InstanceKlass::cast here because |
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1203 // interfaces' InstanceKlass's C++ vtbls haven't been |
0 | 1204 // reinitialized yet (they will be once the interface classes |
1205 // are loaded) | |
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1206 Symbol* name = k->name(); |
0 | 1207 resolve_super_or_fail(class_name, name, class_loader, Handle(), false, CHECK_(nh)); |
1208 } | |
1209 | |
1210 // Adjust methods to recover missing data. They need addresses for | |
1211 // interpreter entry points and their default native method address | |
1212 // must be reset. | |
1213 | |
1214 // Updating methods must be done under a lock so multiple | |
1215 // threads don't update these in parallel | |
1216 // Shared classes are all currently loaded by the bootstrap | |
1217 // classloader, so this will never cause a deadlock on | |
1218 // a custom class loader lock. | |
1219 | |
1220 { | |
1221 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
1222 check_loader_lock_contention(lockObject, THREAD); | |
1223 ObjectLocker ol(lockObject, THREAD, true); | |
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1224 ik->restore_unshareable_info(CHECK_(nh)); |
0 | 1225 } |
1226 | |
1227 if (TraceClassLoading) { | |
1228 ResourceMark rm; | |
1229 tty->print("[Loaded %s", ik->external_name()); | |
1230 tty->print(" from shared objects file"); | |
1231 tty->print_cr("]"); | |
1232 } | |
1233 // notify a class loaded from shared object | |
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1234 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(ik()), |
0 | 1235 true /* shared class */); |
1236 } | |
1237 return ik; | |
1238 } | |
1239 | |
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1240 void SystemDictionary::clean_up_shared_class(instanceKlassHandle ik, Handle class_loader, TRAPS) { |
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1241 // Updating methods must be done under a lock so multiple |
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1242 // threads don't update these in parallel |
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1243 // Shared classes are all currently loaded by the bootstrap |
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1244 // classloader, so this will never cause a deadlock on |
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1245 // a custom class loader lock. |
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1246 { |
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1247 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); |
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1248 check_loader_lock_contention(lockObject, THREAD); |
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1249 ObjectLocker ol(lockObject, THREAD, true); |
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1250 ik->remove_unshareable_info(); |
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1251 } |
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1252 } |
0 | 1253 |
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1254 instanceKlassHandle SystemDictionary::load_instance_class(Symbol* class_name, Handle class_loader, TRAPS) { |
0 | 1255 instanceKlassHandle nh = instanceKlassHandle(); // null Handle |
1256 if (class_loader.is_null()) { | |
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1257 |
0 | 1258 // Search the shared system dictionary for classes preloaded into the |
1259 // shared spaces. | |
1260 instanceKlassHandle k; | |
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1261 { |
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1262 PerfTraceTime vmtimer(ClassLoader::perf_shared_classload_time()); |
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1263 k = load_shared_class(class_name, class_loader, THREAD); |
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1264 } |
0 | 1265 |
1266 if (k.is_null()) { | |
1267 // Use VM class loader | |
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1268 PerfTraceTime vmtimer(ClassLoader::perf_sys_classload_time()); |
0 | 1269 k = ClassLoader::load_classfile(class_name, CHECK_(nh)); |
1270 } | |
1271 | |
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1272 // find_or_define_instance_class may return a different InstanceKlass |
0 | 1273 if (!k.is_null()) { |
1274 k = find_or_define_instance_class(class_name, class_loader, k, CHECK_(nh)); | |
1275 } | |
1276 return k; | |
1277 } else { | |
1278 // Use user specified class loader to load class. Call loadClass operation on class_loader. | |
1279 ResourceMark rm(THREAD); | |
1280 | |
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1281 assert(THREAD->is_Java_thread(), "must be a JavaThread"); |
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1282 JavaThread* jt = (JavaThread*) THREAD; |
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1283 |
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1284 PerfClassTraceTime vmtimer(ClassLoader::perf_app_classload_time(), |
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1285 ClassLoader::perf_app_classload_selftime(), |
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1286 ClassLoader::perf_app_classload_count(), |
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1287 jt->get_thread_stat()->perf_recursion_counts_addr(), |
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1288 jt->get_thread_stat()->perf_timers_addr(), |
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1289 PerfClassTraceTime::CLASS_LOAD); |
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1290 |
0 | 1291 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nh)); |
1292 // Translate to external class name format, i.e., convert '/' chars to '.' | |
1293 Handle string = java_lang_String::externalize_classname(s, CHECK_(nh)); | |
1294 | |
1295 JavaValue result(T_OBJECT); | |
1296 | |
1142 | 1297 KlassHandle spec_klass (THREAD, SystemDictionary::ClassLoader_klass()); |
0 | 1298 |
514 | 1299 // Call public unsynchronized loadClass(String) directly for all class loaders |
1300 // for parallelCapable class loaders. JDK >=7, loadClass(String, boolean) will | |
1301 // acquire a class-name based lock rather than the class loader object lock. | |
1302 // JDK < 7 already acquire the class loader lock in loadClass(String, boolean), | |
1303 // so the call to loadClassInternal() was not required. | |
1304 // | |
1305 // UnsyncloadClass flag means both call loadClass(String) and do | |
1306 // not acquire the class loader lock even for class loaders that are | |
1307 // not parallelCapable. This was a risky transitional | |
1308 // flag for diagnostic purposes only. It is risky to call | |
0 | 1309 // custom class loaders without synchronization. |
1310 // WARNING If a custom class loader does NOT synchronizer findClass, or callers of | |
514 | 1311 // findClass, the UnsyncloadClass flag risks unexpected timing bugs in the field. |
0 | 1312 // Do NOT assume this will be supported in future releases. |
514 | 1313 // |
1314 // Added MustCallLoadClassInternal in case we discover in the field | |
1315 // a customer that counts on this call | |
1316 if (MustCallLoadClassInternal && has_loadClassInternal()) { | |
0 | 1317 JavaCalls::call_special(&result, |
1318 class_loader, | |
1319 spec_klass, | |
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1320 vmSymbols::loadClassInternal_name(), |
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1321 vmSymbols::string_class_signature(), |
0 | 1322 string, |
1323 CHECK_(nh)); | |
1324 } else { | |
1325 JavaCalls::call_virtual(&result, | |
1326 class_loader, | |
1327 spec_klass, | |
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1328 vmSymbols::loadClass_name(), |
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1329 vmSymbols::string_class_signature(), |
0 | 1330 string, |
1331 CHECK_(nh)); | |
1332 } | |
1333 | |
1334 assert(result.get_type() == T_OBJECT, "just checking"); | |
1335 oop obj = (oop) result.get_jobject(); | |
1336 | |
1337 // Primitive classes return null since forName() can not be | |
1338 // used to obtain any of the Class objects representing primitives or void | |
1339 if ((obj != NULL) && !(java_lang_Class::is_primitive(obj))) { | |
1340 instanceKlassHandle k = | |
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1341 instanceKlassHandle(THREAD, java_lang_Class::as_Klass(obj)); |
0 | 1342 // For user defined Java class loaders, check that the name returned is |
1343 // the same as that requested. This check is done for the bootstrap | |
1344 // loader when parsing the class file. | |
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1345 if (class_name == k->name()) { |
0 | 1346 return k; |
1347 } | |
1348 } | |
1349 // Class is not found or has the wrong name, return NULL | |
1350 return nh; | |
1351 } | |
1352 } | |
1353 | |
1354 void SystemDictionary::define_instance_class(instanceKlassHandle k, TRAPS) { | |
1355 | |
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1356 ClassLoaderData* loader_data = k->class_loader_data(); |
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1357 Handle class_loader_h(THREAD, loader_data->class_loader()); |
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1358 |
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1359 for (uintx it = 0; it < GCExpandToAllocateDelayMillis; it++){} |
0 | 1360 |
514 | 1361 // for bootstrap and other parallel classloaders don't acquire lock, |
1362 // use placeholder token | |
1363 // If a parallelCapable class loader calls define_instance_class instead of | |
1364 // find_or_define_instance_class to get here, we have a timing | |
1365 // hole with systemDictionary updates and check_constraints | |
1366 if (!class_loader_h.is_null() && !is_parallelCapable(class_loader_h)) { | |
0 | 1367 assert(ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, |
1368 compute_loader_lock_object(class_loader_h, THREAD)), | |
1369 "define called without lock"); | |
1370 } | |
1371 | |
1372 // Check class-loading constraints. Throw exception if violation is detected. | |
1373 // Grabs and releases SystemDictionary_lock | |
1374 // The check_constraints/find_class call and update_dictionary sequence | |
1375 // must be "atomic" for a specific class/classloader pair so we never | |
1376 // define two different instanceKlasses for that class/classloader pair. | |
1377 // Existing classloaders will call define_instance_class with the | |
1378 // classloader lock held | |
1379 // Parallel classloaders will call find_or_define_instance_class | |
1380 // which will require a token to perform the define class | |
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1381 Symbol* name_h = k->name(); |
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1382 unsigned int d_hash = dictionary()->compute_hash(name_h, loader_data); |
0 | 1383 int d_index = dictionary()->hash_to_index(d_hash); |
1384 check_constraints(d_index, d_hash, k, class_loader_h, true, CHECK); | |
1385 | |
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1386 // Register class just loaded with class loader (placed in Vector) |
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1387 // Note we do this before updating the dictionary, as this can |
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1388 // fail with an OutOfMemoryError (if it does, we will *not* put this |
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1389 // class in the dictionary and will not update the class hierarchy). |
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1390 // JVMTI FollowReferences needs to find the classes this way. |
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1391 if (k->class_loader() != NULL) { |
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1392 methodHandle m(THREAD, Universe::loader_addClass_method()); |
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1393 JavaValue result(T_VOID); |
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1394 JavaCallArguments args(class_loader_h); |
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1395 args.push_oop(Handle(THREAD, k->java_mirror())); |
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1396 JavaCalls::call(&result, m, &args, CHECK); |
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1397 } |
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1398 |
0 | 1399 // Add the new class. We need recompile lock during update of CHA. |
1400 { | |
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1401 unsigned int p_hash = placeholders()->compute_hash(name_h, loader_data); |
0 | 1402 int p_index = placeholders()->hash_to_index(p_hash); |
1403 | |
1404 MutexLocker mu_r(Compile_lock, THREAD); | |
1405 | |
1406 // Add to class hierarchy, initialize vtables, and do possible | |
1407 // deoptimizations. | |
1408 add_to_hierarchy(k, CHECK); // No exception, but can block | |
1409 | |
1410 // Add to systemDictionary - so other classes can see it. | |
1411 // Grabs and releases SystemDictionary_lock | |
1412 update_dictionary(d_index, d_hash, p_index, p_hash, | |
1413 k, class_loader_h, THREAD); | |
1414 } | |
1415 k->eager_initialize(THREAD); | |
1416 | |
1417 // notify jvmti | |
1418 if (JvmtiExport::should_post_class_load()) { | |
1419 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); | |
1420 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); | |
1421 | |
1422 } | |
1423 } | |
1424 | |
1425 // Support parallel classloading | |
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1426 // All parallel class loaders, including bootstrap classloader |
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1427 // lock a placeholder entry for this class/class_loader pair |
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1428 // to allow parallel defines of different classes for this class loader |
514 | 1429 // With AllowParallelDefine flag==true, in case they do not synchronize around |
1430 // FindLoadedClass/DefineClass, calls, we check for parallel | |
0 | 1431 // loading for them, wait if a defineClass is in progress |
1432 // and return the initial requestor's results | |
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1433 // This flag does not apply to the bootstrap classloader. |
514 | 1434 // With AllowParallelDefine flag==false, call through to define_instance_class |
1435 // which will throw LinkageError: duplicate class definition. | |
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1436 // False is the requested default. |
0 | 1437 // For better performance, the class loaders should synchronize |
514 | 1438 // findClass(), i.e. FindLoadedClass/DefineClassIfAbsent or they |
0 | 1439 // potentially waste time reading and parsing the bytestream. |
1440 // Note: VM callers should ensure consistency of k/class_name,class_loader | |
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1441 instanceKlassHandle SystemDictionary::find_or_define_instance_class(Symbol* class_name, Handle class_loader, instanceKlassHandle k, TRAPS) { |
0 | 1442 |
1443 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1444 Symbol* name_h = k->name(); // passed in class_name may be null |
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1445 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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1446 |
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1447 unsigned int d_hash = dictionary()->compute_hash(name_h, loader_data); |
0 | 1448 int d_index = dictionary()->hash_to_index(d_hash); |
1449 | |
1450 // Hold SD lock around find_class and placeholder creation for DEFINE_CLASS | |
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1451 unsigned int p_hash = placeholders()->compute_hash(name_h, loader_data); |
0 | 1452 int p_index = placeholders()->hash_to_index(p_hash); |
1453 PlaceholderEntry* probe; | |
1454 | |
1455 { | |
1456 MutexLocker mu(SystemDictionary_lock, THREAD); | |
1457 // First check if class already defined | |
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1458 if (UnsyncloadClass || (is_parallelDefine(class_loader))) { |
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1459 Klass* check = find_class(d_index, d_hash, name_h, loader_data); |
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1460 if (check != NULL) { |
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1461 return(instanceKlassHandle(THREAD, check)); |
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1462 } |
0 | 1463 } |
1464 | |
1465 // Acquire define token for this class/classloader | |
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1466 probe = placeholders()->find_and_add(p_index, p_hash, name_h, loader_data, PlaceholderTable::DEFINE_CLASS, NULL, THREAD); |
514 | 1467 // Wait if another thread defining in parallel |
1468 // All threads wait - even those that will throw duplicate class: otherwise | |
1469 // caller is surprised by LinkageError: duplicate, but findLoadedClass fails | |
1470 // if other thread has not finished updating dictionary | |
1471 while (probe->definer() != NULL) { | |
1472 SystemDictionary_lock->wait(); | |
1473 } | |
1474 // Only special cases allow parallel defines and can use other thread's results | |
1475 // Other cases fall through, and may run into duplicate defines | |
1476 // caught by finding an entry in the SystemDictionary | |
6983 | 1477 if ((UnsyncloadClass || is_parallelDefine(class_loader)) && (probe->instance_klass() != NULL)) { |
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1478 placeholders()->find_and_remove(p_index, p_hash, name_h, loader_data, PlaceholderTable::DEFINE_CLASS, THREAD); |
514 | 1479 SystemDictionary_lock->notify_all(); |
0 | 1480 #ifdef ASSERT |
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1481 Klass* check = find_class(d_index, d_hash, name_h, loader_data); |
514 | 1482 assert(check != NULL, "definer missed recording success"); |
0 | 1483 #endif |
6983 | 1484 return(instanceKlassHandle(THREAD, probe->instance_klass())); |
0 | 1485 } else { |
514 | 1486 // This thread will define the class (even if earlier thread tried and had an error) |
1487 probe->set_definer(THREAD); | |
0 | 1488 } |
1489 } | |
1490 | |
1491 define_instance_class(k, THREAD); | |
1492 | |
1493 Handle linkage_exception = Handle(); // null handle | |
1494 | |
1495 // definer must notify any waiting threads | |
1496 { | |
1497 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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1498 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name_h, loader_data); |
0 | 1499 assert(probe != NULL, "DEFINE_CLASS placeholder lost?"); |
1500 if (probe != NULL) { | |
1501 if (HAS_PENDING_EXCEPTION) { | |
1502 linkage_exception = Handle(THREAD,PENDING_EXCEPTION); | |
1503 CLEAR_PENDING_EXCEPTION; | |
1504 } else { | |
6983 | 1505 probe->set_instance_klass(k()); |
0 | 1506 } |
1507 probe->set_definer(NULL); | |
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1508 placeholders()->find_and_remove(p_index, p_hash, name_h, loader_data, PlaceholderTable::DEFINE_CLASS, THREAD); |
0 | 1509 SystemDictionary_lock->notify_all(); |
1510 } | |
1511 } | |
1512 | |
1513 // Can't throw exception while holding lock due to rank ordering | |
1514 if (linkage_exception() != NULL) { | |
1515 THROW_OOP_(linkage_exception(), nh); // throws exception and returns | |
1516 } | |
1517 | |
1518 return k; | |
1519 } | |
1520 Handle SystemDictionary::compute_loader_lock_object(Handle class_loader, TRAPS) { | |
1521 // If class_loader is NULL we synchronize on _system_loader_lock_obj | |
1522 if (class_loader.is_null()) { | |
1523 return Handle(THREAD, _system_loader_lock_obj); | |
1524 } else { | |
1525 return class_loader; | |
1526 } | |
1527 } | |
1528 | |
1529 // This method is added to check how often we have to wait to grab loader | |
1530 // lock. The results are being recorded in the performance counters defined in | |
1531 // ClassLoader::_sync_systemLoaderLockContentionRate and | |
1532 // ClassLoader::_sync_nonSystemLoaderLockConteionRate. | |
1533 void SystemDictionary::check_loader_lock_contention(Handle loader_lock, TRAPS) { | |
1534 if (!UsePerfData) { | |
1535 return; | |
1536 } | |
1537 | |
1538 assert(!loader_lock.is_null(), "NULL lock object"); | |
1539 | |
1540 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader_lock) | |
1541 == ObjectSynchronizer::owner_other) { | |
1542 // contention will likely happen, so increment the corresponding | |
1543 // contention counter. | |
1544 if (loader_lock() == _system_loader_lock_obj) { | |
1545 ClassLoader::sync_systemLoaderLockContentionRate()->inc(); | |
1546 } else { | |
1547 ClassLoader::sync_nonSystemLoaderLockContentionRate()->inc(); | |
1548 } | |
1549 } | |
1550 } | |
1551 | |
1552 // ---------------------------------------------------------------------------- | |
1553 // Lookup | |
1554 | |
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1555 Klass* SystemDictionary::find_class(int index, unsigned int hash, |
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1556 Symbol* class_name, |
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1557 ClassLoaderData* loader_data) { |
0 | 1558 assert_locked_or_safepoint(SystemDictionary_lock); |
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1559 assert (index == dictionary()->index_for(class_name, loader_data), |
0 | 1560 "incorrect index?"); |
1561 | |
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1562 Klass* k = dictionary()->find_class(index, hash, class_name, loader_data); |
0 | 1563 return k; |
1564 } | |
1565 | |
1566 | |
1567 // Basic find on classes in the midst of being loaded | |
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1568 Symbol* SystemDictionary::find_placeholder(Symbol* class_name, |
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1569 ClassLoaderData* loader_data) { |
0 | 1570 assert_locked_or_safepoint(SystemDictionary_lock); |
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1571 unsigned int p_hash = placeholders()->compute_hash(class_name, loader_data); |
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1572 int p_index = placeholders()->hash_to_index(p_hash); |
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1573 return placeholders()->find_entry(p_index, p_hash, class_name, loader_data); |
0 | 1574 } |
1575 | |
1576 | |
1577 // Used for assertions and verification only | |
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1578 Klass* SystemDictionary::find_class(Symbol* class_name, ClassLoaderData* loader_data) { |
0 | 1579 #ifndef ASSERT |
1580 guarantee(VerifyBeforeGC || | |
1581 VerifyDuringGC || | |
1582 VerifyBeforeExit || | |
1583 VerifyAfterGC, "too expensive"); | |
1584 #endif | |
1585 assert_locked_or_safepoint(SystemDictionary_lock); | |
1586 | |
1587 // First look in the loaded class array | |
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1588 unsigned int d_hash = dictionary()->compute_hash(class_name, loader_data); |
0 | 1589 int d_index = dictionary()->hash_to_index(d_hash); |
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1590 return find_class(d_index, d_hash, class_name, loader_data); |
0 | 1591 } |
1592 | |
1593 | |
1594 // Get the next class in the diictionary. | |
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1595 Klass* SystemDictionary::try_get_next_class() { |
0 | 1596 return dictionary()->try_get_next_class(); |
1597 } | |
1598 | |
1599 | |
1600 // ---------------------------------------------------------------------------- | |
1601 // Update hierachy. This is done before the new klass has been added to the SystemDictionary. The Recompile_lock | |
1602 // is held, to ensure that the compiler is not using the class hierachy, and that deoptimization will kick in | |
1603 // before a new class is used. | |
1604 | |
1605 void SystemDictionary::add_to_hierarchy(instanceKlassHandle k, TRAPS) { | |
1606 assert(k.not_null(), "just checking"); | |
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1607 assert_locked_or_safepoint(Compile_lock); |
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1608 |
0 | 1609 // Link into hierachy. Make sure the vtables are initialized before linking into |
1610 k->append_to_sibling_list(); // add to superklass/sibling list | |
1611 k->process_interfaces(THREAD); // handle all "implements" declarations | |
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1612 k->set_init_state(InstanceKlass::loaded); |
0 | 1613 // Now flush all code that depended on old class hierarchy. |
1614 // Note: must be done *after* linking k into the hierarchy (was bug 12/9/97) | |
1615 // Also, first reinitialize vtable because it may have gotten out of synch | |
1616 // while the new class wasn't connected to the class hierarchy. | |
1617 Universe::flush_dependents_on(k); | |
1618 } | |
1619 | |
1620 | |
1621 // ---------------------------------------------------------------------------- | |
1622 // GC support | |
1623 | |
1624 // Following roots during mark-sweep is separated in two phases. | |
1625 // | |
1626 // The first phase follows preloaded classes and all other system | |
1627 // classes, since these will never get unloaded anyway. | |
1628 // | |
1629 // The second phase removes (unloads) unreachable classes from the | |
1630 // system dictionary and follows the remaining classes' contents. | |
1631 | |
1632 void SystemDictionary::always_strong_oops_do(OopClosure* blk) { | |
1633 blk->do_oop(&_java_system_loader); | |
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1634 blk->do_oop(&_system_loader_lock_obj); |
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1635 |
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1636 dictionary()->always_strong_oops_do(blk); |
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1637 |
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1638 // Visit extra methods |
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1639 invoke_method_table()->oops_do(blk); |
0 | 1640 } |
1641 | |
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1642 void SystemDictionary::always_strong_classes_do(KlassClosure* closure) { |
0 | 1643 // Follow all system classes and temporary placeholders in dictionary |
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1644 dictionary()->always_strong_classes_do(closure); |
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1645 |
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1646 // Placeholders. These represent classes we're actively loading. |
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1647 placeholders()->classes_do(closure); |
0 | 1648 } |
1649 | |
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1650 // Calculate a "good" systemdictionary size based |
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1651 // on predicted or current loaded classes count |
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1652 int SystemDictionary::calculate_systemdictionary_size(int classcount) { |
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1653 int newsize = _old_default_sdsize; |
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1654 if ((classcount > 0) && !DumpSharedSpaces) { |
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1655 int desiredsize = classcount/_average_depth_goal; |
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1656 for (newsize = _primelist[_sdgeneration]; _sdgeneration < _prime_array_size -1; |
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1657 newsize = _primelist[++_sdgeneration]) { |
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1658 if (desiredsize <= newsize) { |
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1659 break; |
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1660 } |
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1661 } |
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1662 } |
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1663 return newsize; |
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1664 } |
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1665 // Assumes classes in the SystemDictionary are only unloaded at a safepoint |
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1666 // Note: anonymous classes are not in the SD. |
0 | 1667 bool SystemDictionary::do_unloading(BoolObjectClosure* is_alive) { |
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1668 // First, mark for unload all ClassLoaderData referencing a dead class loader. |
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1669 bool has_dead_loaders = ClassLoaderDataGraph::do_unloading(is_alive); |
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1670 bool unloading_occurred = false; |
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1671 if (has_dead_loaders) { |
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1672 unloading_occurred = dictionary()->do_unloading(); |
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1673 constraints()->purge_loader_constraints(); |
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1674 resolution_errors()->purge_resolution_errors(); |
0 | 1675 } |
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1676 return unloading_occurred; |
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1677 } |
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1678 |
0 | 1679 void SystemDictionary::oops_do(OopClosure* f) { |
1680 f->do_oop(&_java_system_loader); | |
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1681 f->do_oop(&_system_loader_lock_obj); |
0 | 1682 |
1683 // Adjust dictionary | |
1684 dictionary()->oops_do(f); | |
1685 | |
710 | 1686 // Visit extra methods |
1903 | 1687 invoke_method_table()->oops_do(f); |
0 | 1688 } |
1689 | |
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1690 // Extended Class redefinition support. |
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1691 // If one of these classes is replaced, we need to replace it in these places. |
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1692 // KlassClosure::do_klass should take the address of a class but we can |
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1693 // change that later. |
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1694 void SystemDictionary::preloaded_classes_do(KlassClosure* f) { |
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1695 for (int k = (int)FIRST_WKID; k < (int)WKID_LIMIT; k++) { |
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1696 f->do_klass(_well_known_klasses[k]); |
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1697 } |
0 | 1698 |
1699 { | |
1700 for (int i = 0; i < T_VOID+1; i++) { | |
1701 if (_box_klasses[i] != NULL) { | |
1702 assert(i >= T_BOOLEAN, "checking"); | |
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1703 f->do_klass(_box_klasses[i]); |
0 | 1704 } |
1705 } | |
1706 } | |
1707 | |
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1708 FilteredFieldsMap::classes_do(f); |
0 | 1709 } |
1710 | |
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1711 void SystemDictionary::lazily_loaded_classes_do(KlassClosure* f) { |
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1712 f->do_klass(_abstract_ownable_synchronizer_klass); |
0 | 1713 } |
1714 | |
1715 // Just the classes from defining class loaders | |
1716 // Don't iterate over placeholders | |
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1717 void SystemDictionary::classes_do(void f(Klass*)) { |
0 | 1718 dictionary()->classes_do(f); |
1719 } | |
1720 | |
1721 // Added for initialize_itable_for_klass | |
1722 // Just the classes from defining class loaders | |
1723 // Don't iterate over placeholders | |
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1724 void SystemDictionary::classes_do(void f(Klass*, TRAPS), TRAPS) { |
0 | 1725 dictionary()->classes_do(f, CHECK); |
1726 } | |
1727 | |
1728 // All classes, and their class loaders | |
1729 // Don't iterate over placeholders | |
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1730 void SystemDictionary::classes_do(void f(Klass*, ClassLoaderData*)) { |
0 | 1731 dictionary()->classes_do(f); |
1732 } | |
1733 | |
1734 // All classes, and their class loaders | |
1735 // (added for helpers that use HandleMarks and ResourceMarks) | |
1736 // Don't iterate over placeholders | |
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1737 void SystemDictionary::classes_do(void f(Klass*, ClassLoaderData*, TRAPS), TRAPS) { |
0 | 1738 dictionary()->classes_do(f, CHECK); |
1739 } | |
1740 | |
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1741 void SystemDictionary::placeholders_do(void f(Symbol*)) { |
0 | 1742 placeholders()->entries_do(f); |
1743 } | |
1744 | |
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1745 void SystemDictionary::methods_do(void f(Method*)) { |
0 | 1746 dictionary()->methods_do(f); |
1903 | 1747 invoke_method_table()->methods_do(f); |
0 | 1748 } |
1749 | |
1750 // ---------------------------------------------------------------------------- | |
1751 // Lazily load klasses | |
1752 | |
1753 void SystemDictionary::load_abstract_ownable_synchronizer_klass(TRAPS) { | |
1754 assert(JDK_Version::is_gte_jdk16x_version(), "Must be JDK 1.6 or later"); | |
1755 | |
1756 // if multiple threads calling this function, only one thread will load | |
1757 // the class. The other threads will find the loaded version once the | |
1758 // class is loaded. | |
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1759 Klass* aos = _abstract_ownable_synchronizer_klass; |
0 | 1760 if (aos == NULL) { |
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1761 Klass* k = resolve_or_fail(vmSymbols::java_util_concurrent_locks_AbstractOwnableSynchronizer(), true, CHECK); |
0 | 1762 // Force a fence to prevent any read before the write completes |
1763 OrderAccess::fence(); | |
1764 _abstract_ownable_synchronizer_klass = k; | |
1765 } | |
1766 } | |
1767 | |
1768 // ---------------------------------------------------------------------------- | |
1769 // Initialization | |
1770 | |
1771 void SystemDictionary::initialize(TRAPS) { | |
1772 // Allocate arrays | |
1773 assert(dictionary() == NULL, | |
1774 "SystemDictionary should only be initialized once"); | |
4864
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1775 _sdgeneration = 0; |
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1776 _dictionary = new Dictionary(calculate_systemdictionary_size(PredictedLoadedClassCount)); |
1903 | 1777 _placeholders = new PlaceholderTable(_nof_buckets); |
0 | 1778 _number_of_modifications = 0; |
1903 | 1779 _loader_constraints = new LoaderConstraintTable(_loader_constraint_size); |
1780 _resolution_errors = new ResolutionErrorTable(_resolution_error_size); | |
1781 _invoke_method_table = new SymbolPropertyTable(_invoke_method_size); | |
0 | 1782 |
1783 // Allocate private object used as system class loader lock | |
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1784 _system_loader_lock_obj = oopFactory::new_intArray(0, CHECK); |
0 | 1785 // Initialize basic classes |
1786 initialize_preloaded_classes(CHECK); | |
1787 } | |
1788 | |
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1789 // Compact table of directions on the initialization of klasses: |
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1790 static const short wk_init_info[] = { |
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1791 #define WK_KLASS_INIT_INFO(name, symbol, option) \ |
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1792 ( ((int)vmSymbols::VM_SYMBOL_ENUM_NAME(symbol) \ |
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1793 << SystemDictionary::CEIL_LG_OPTION_LIMIT) \ |
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1794 | (int)SystemDictionary::option ), |
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1795 WK_KLASSES_DO(WK_KLASS_INIT_INFO) |
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1796 #undef WK_KLASS_INIT_INFO |
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1797 0 |
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1798 }; |
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1799 |
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1800 bool SystemDictionary::initialize_wk_klass(WKID id, int init_opt, TRAPS) { |
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1801 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1802 int info = wk_init_info[id - FIRST_WKID]; |
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1803 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1804 Symbol* symbol = vmSymbols::symbol_at((vmSymbols::SID)sid); |
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1805 Klass** klassp = &_well_known_klasses[id]; |
2460 | 1806 bool must_load = (init_opt < SystemDictionary::Opt); |
7951 | 1807 if ((*klassp) == NULL) { |
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1808 if (must_load) { |
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1809 (*klassp) = resolve_or_fail(symbol, true, CHECK_0); // load required class |
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1810 } else { |
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1811 (*klassp) = resolve_or_null(symbol, CHECK_0); // load optional klass |
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1812 } |
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1813 } |
2460 | 1814 return ((*klassp) != NULL); |
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1815 } |
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1816 |
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1817 void SystemDictionary::initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS) { |
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1818 assert((int)start_id <= (int)limit_id, "IDs are out of order!"); |
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1819 for (int id = (int)start_id; id < (int)limit_id; id++) { |
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1820 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1821 int info = wk_init_info[id - FIRST_WKID]; |
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1822 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1823 int opt = (info & right_n_bits(CEIL_LG_OPTION_LIMIT)); |
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1824 |
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1825 initialize_wk_klass((WKID)id, opt, CHECK); |
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1826 } |
710 | 1827 |
1828 // move the starting value forward to the limit: | |
1829 start_id = limit_id; | |
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1830 } |
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1831 |
0 | 1832 void SystemDictionary::initialize_preloaded_classes(TRAPS) { |
1142 | 1833 assert(WK_KLASS(Object_klass) == NULL, "preloaded classes should only be initialized once"); |
0 | 1834 // Preload commonly used klasses |
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1835 WKID scan = FIRST_WKID; |
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1836 // first do Object, then String, Class |
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1837 if (UseSharedSpaces) { |
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1838 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Object_klass), scan, CHECK); |
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1839 // Initialize the constant pool for the Object_class |
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1840 InstanceKlass* ik = InstanceKlass::cast(Object_klass()); |
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1841 ik->constants()->restore_unshareable_info(CHECK); |
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1842 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Class_klass), scan, CHECK); |
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1843 } else { |
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1844 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Class_klass), scan, CHECK); |
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1845 } |
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1846 |
6057 | 1847 // Calculate offsets for String and Class classes since they are loaded and |
1848 // can be used after this point. | |
1849 java_lang_String::compute_offsets(); | |
3938 | 1850 java_lang_Class::compute_offsets(); |
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1851 |
0 | 1852 // Fixup mirrors for classes loaded before java.lang.Class. |
1853 // These calls iterate over the objects currently in the perm gen | |
1854 // so calling them at this point is matters (not before when there | |
1855 // are fewer objects and not later after there are more objects | |
1856 // in the perm gen. | |
1857 Universe::initialize_basic_type_mirrors(CHECK); | |
1858 Universe::fixup_mirrors(CHECK); | |
1859 | |
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1860 // do a bunch more: |
1142 | 1861 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Reference_klass), scan, CHECK); |
0 | 1862 |
1863 // Preload ref klasses and set reference types | |
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1864 InstanceKlass::cast(WK_KLASS(Reference_klass))->set_reference_type(REF_OTHER); |
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1865 InstanceRefKlass::update_nonstatic_oop_maps(WK_KLASS(Reference_klass)); |
0 | 1866 |
1142 | 1867 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(PhantomReference_klass), scan, CHECK); |
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1868 InstanceKlass::cast(WK_KLASS(SoftReference_klass))->set_reference_type(REF_SOFT); |
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1869 InstanceKlass::cast(WK_KLASS(WeakReference_klass))->set_reference_type(REF_WEAK); |
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1870 InstanceKlass::cast(WK_KLASS(FinalReference_klass))->set_reference_type(REF_FINAL); |
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1871 InstanceKlass::cast(WK_KLASS(PhantomReference_klass))->set_reference_type(REF_PHANTOM); |
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1872 |
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1873 // JSR 292 classes |
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1874 WKID jsr292_group_start = WK_KLASS_ENUM_NAME(MethodHandle_klass); |
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1875 WKID jsr292_group_end = WK_KLASS_ENUM_NAME(VolatileCallSite_klass); |
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1876 initialize_wk_klasses_until(jsr292_group_start, scan, CHECK); |
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1877 if (EnableInvokeDynamic) { |
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1878 initialize_wk_klasses_through(jsr292_group_end, scan, CHECK); |
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1879 } else { |
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1880 // Skip the JSR 292 classes, if not enabled. |
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1881 scan = WKID(jsr292_group_end + 1); |
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1882 } |
710 | 1883 |
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1884 initialize_wk_klasses_until(WKID_LIMIT, scan, CHECK); |
0 | 1885 |
1142 | 1886 _box_klasses[T_BOOLEAN] = WK_KLASS(Boolean_klass); |
1887 _box_klasses[T_CHAR] = WK_KLASS(Character_klass); | |
1888 _box_klasses[T_FLOAT] = WK_KLASS(Float_klass); | |
1889 _box_klasses[T_DOUBLE] = WK_KLASS(Double_klass); | |
1890 _box_klasses[T_BYTE] = WK_KLASS(Byte_klass); | |
1891 _box_klasses[T_SHORT] = WK_KLASS(Short_klass); | |
1892 _box_klasses[T_INT] = WK_KLASS(Integer_klass); | |
1893 _box_klasses[T_LONG] = WK_KLASS(Long_klass); | |
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1894 //_box_klasses[T_OBJECT] = WK_KLASS(object_klass); |
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1895 //_box_klasses[T_ARRAY] = WK_KLASS(object_klass); |
0 | 1896 |
1897 { // Compute whether we should use loadClass or loadClassInternal when loading classes. | |
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1898 Method* method = InstanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::loadClassInternal_name(), vmSymbols::string_class_signature()); |
0 | 1899 _has_loadClassInternal = (method != NULL); |
1900 } | |
1901 { // Compute whether we should use checkPackageAccess or NOT | |
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1902 Method* method = InstanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::checkPackageAccess_name(), vmSymbols::class_protectiondomain_signature()); |
0 | 1903 _has_checkPackageAccess = (method != NULL); |
1904 } | |
1905 } | |
1906 | |
1907 // Tells if a given klass is a box (wrapper class, such as java.lang.Integer). | |
1908 // If so, returns the basic type it holds. If not, returns T_OBJECT. | |
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1909 BasicType SystemDictionary::box_klass_type(Klass* k) { |
0 | 1910 assert(k != NULL, ""); |
1911 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { | |
1912 if (_box_klasses[i] == k) | |
1913 return (BasicType)i; | |
1914 } | |
1915 return T_OBJECT; | |
1916 } | |
1917 | |
1918 // Constraints on class loaders. The details of the algorithm can be | |
1919 // found in the OOPSLA'98 paper "Dynamic Class Loading in the Java | |
1920 // Virtual Machine" by Sheng Liang and Gilad Bracha. The basic idea is | |
1921 // that the system dictionary needs to maintain a set of contraints that | |
1922 // must be satisfied by all classes in the dictionary. | |
1923 // if defining is true, then LinkageError if already in systemDictionary | |
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1924 // if initiating loader, then ok if InstanceKlass matches existing entry |
0 | 1925 |
1926 void SystemDictionary::check_constraints(int d_index, unsigned int d_hash, | |
1927 instanceKlassHandle k, | |
1928 Handle class_loader, bool defining, | |
1929 TRAPS) { | |
1930 const char *linkage_error = NULL; | |
1931 { | |
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1932 Symbol* name = k->name(); |
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1933 ClassLoaderData *loader_data = class_loader_data(class_loader); |
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1934 |
0 | 1935 MutexLocker mu(SystemDictionary_lock, THREAD); |
1936 | |
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1937 Klass* check = find_class(d_index, d_hash, name, loader_data); |
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1938 if (check != (Klass*)NULL) { |
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1939 // if different InstanceKlass - duplicate class definition, |
0 | 1940 // else - ok, class loaded by a different thread in parallel, |
1941 // we should only have found it if it was done loading and ok to use | |
1942 // system dictionary only holds instance classes, placeholders | |
1943 // also holds array classes | |
1944 | |
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1945 assert(check->oop_is_instance(), "noninstance in systemdictionary"); |
0 | 1946 if ((defining == true) || (k() != check)) { |
1947 linkage_error = "loader (instance of %s): attempted duplicate class " | |
1948 "definition for name: \"%s\""; | |
1949 } else { | |
1950 return; | |
1951 } | |
1952 } | |
1953 | |
1954 #ifdef ASSERT | |
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1955 Symbol* ph_check = find_placeholder(name, loader_data); |
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1956 assert(ph_check == NULL || ph_check == name, "invalid symbol"); |
0 | 1957 #endif |
1958 | |
1959 if (linkage_error == NULL) { | |
1960 if (constraints()->check_or_update(k, class_loader, name) == false) { | |
1961 linkage_error = "loader constraint violation: loader (instance of %s)" | |
1962 " previously initiated loading for a different type with name \"%s\""; | |
1963 } | |
1964 } | |
1965 } | |
1966 | |
1967 // Throw error now if needed (cannot throw while holding | |
1968 // SystemDictionary_lock because of rank ordering) | |
1969 | |
1970 if (linkage_error) { | |
1971 ResourceMark rm(THREAD); | |
1972 const char* class_loader_name = loader_name(class_loader()); | |
1973 char* type_name = k->name()->as_C_string(); | |
1974 size_t buflen = strlen(linkage_error) + strlen(class_loader_name) + | |
1975 strlen(type_name); | |
1976 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
1977 jio_snprintf(buf, buflen, linkage_error, class_loader_name, type_name); | |
1978 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); | |
1979 } | |
1980 } | |
1981 | |
1982 | |
1983 // Update system dictionary - done after check_constraint and add_to_hierachy | |
1984 // have been called. | |
1985 void SystemDictionary::update_dictionary(int d_index, unsigned int d_hash, | |
1986 int p_index, unsigned int p_hash, | |
1987 instanceKlassHandle k, | |
1988 Handle class_loader, | |
1989 TRAPS) { | |
1990 // Compile_lock prevents systemDictionary updates during compilations | |
1991 assert_locked_or_safepoint(Compile_lock); | |
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1992 Symbol* name = k->name(); |
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1993 ClassLoaderData *loader_data = class_loader_data(class_loader); |
0 | 1994 |
1995 { | |
1996 MutexLocker mu1(SystemDictionary_lock, THREAD); | |
1997 | |
1998 // See whether biased locking is enabled and if so set it for this | |
1999 // klass. | |
2000 // Note that this must be done past the last potential blocking | |
2001 // point / safepoint. We enable biased locking lazily using a | |
2002 // VM_Operation to iterate the SystemDictionary and installing the | |
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2003 // biasable mark word into each InstanceKlass's prototype header. |
0 | 2004 // To avoid race conditions where we accidentally miss enabling the |
2005 // optimization for one class in the process of being added to the | |
2006 // dictionary, we must not safepoint after the test of | |
2007 // BiasedLocking::enabled(). | |
2008 if (UseBiasedLocking && BiasedLocking::enabled()) { | |
2009 // Set biased locking bit for all loaded classes; it will be | |
2010 // cleared if revocation occurs too often for this type | |
2011 // NOTE that we must only do this when the class is initally | |
2012 // defined, not each time it is referenced from a new class loader | |
2013 if (k->class_loader() == class_loader()) { | |
2014 k->set_prototype_header(markOopDesc::biased_locking_prototype()); | |
2015 } | |
2016 } | |
2017 | |
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2018 // Assign a classid if one has not already been assigned. The |
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2019 // counter does not need to be atomically incremented since this |
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2020 // is only done while holding the SystemDictionary_lock. |
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2021 // All loaded classes get a unique ID. |
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2022 TRACE_INIT_ID(k); |
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2023 |
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2024 // Make a new system dictionary entry. |
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2025 Klass* sd_check = find_class(d_index, d_hash, name, loader_data); |
0 | 2026 if (sd_check == NULL) { |
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2027 dictionary()->add_klass(name, loader_data, k); |
0 | 2028 notice_modification(); |
2029 } | |
2030 #ifdef ASSERT | |
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2031 sd_check = find_class(d_index, d_hash, name, loader_data); |
0 | 2032 assert (sd_check != NULL, "should have entry in system dictionary"); |
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2033 // Note: there may be a placeholder entry: for circularity testing |
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2034 // or for parallel defines |
0 | 2035 #endif |
2036 SystemDictionary_lock->notify_all(); | |
2037 } | |
2038 } | |
2039 | |
2040 | |
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2041 // Try to find a class name using the loader constraints. The |
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2042 // loader constraints might know about a class that isn't fully loaded |
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2043 // yet and these will be ignored. |
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2044 Klass* SystemDictionary::find_constrained_instance_or_array_klass( |
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2045 Symbol* class_name, Handle class_loader, TRAPS) { |
0 | 2046 |
2047 // First see if it has been loaded directly. | |
2048 // Force the protection domain to be null. (This removes protection checks.) | |
2049 Handle no_protection_domain; | |
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2050 Klass* klass = find_instance_or_array_klass(class_name, class_loader, |
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2051 no_protection_domain, CHECK_NULL); |
0 | 2052 if (klass != NULL) |
2053 return klass; | |
2054 | |
2055 // Now look to see if it has been loaded elsewhere, and is subject to | |
2056 // a loader constraint that would require this loader to return the | |
2057 // klass that is already loaded. | |
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2058 if (FieldType::is_array(class_name)) { |
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2059 // For array classes, their Klass*s are not kept in the |
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2060 // constraint table. The element Klass*s are. |
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2061 FieldArrayInfo fd; |
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2062 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
0 | 2063 if (t != T_OBJECT) { |
2064 klass = Universe::typeArrayKlassObj(t); | |
2065 } else { | |
2066 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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2067 klass = constraints()->find_constrained_klass(fd.object_key(), class_loader); |
0 | 2068 } |
1336 | 2069 // If element class already loaded, allocate array klass |
0 | 2070 if (klass != NULL) { |
6983 | 2071 klass = klass->array_klass_or_null(fd.dimension()); |
0 | 2072 } |
2073 } else { | |
2074 MutexLocker mu(SystemDictionary_lock, THREAD); | |
2075 // Non-array classes are easy: simply check the constraint table. | |
2076 klass = constraints()->find_constrained_klass(class_name, class_loader); | |
2077 } | |
2078 | |
2079 return klass; | |
2080 } | |
2081 | |
2082 | |
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2083 bool SystemDictionary::add_loader_constraint(Symbol* class_name, |
0 | 2084 Handle class_loader1, |
2085 Handle class_loader2, | |
2086 Thread* THREAD) { | |
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2087 ClassLoaderData* loader_data1 = class_loader_data(class_loader1); |
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2088 ClassLoaderData* loader_data2 = class_loader_data(class_loader2); |
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2089 |
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2090 Symbol* constraint_name = NULL; |
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2091 if (!FieldType::is_array(class_name)) { |
1336 | 2092 constraint_name = class_name; |
2093 } else { | |
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2094 // For array classes, their Klass*s are not kept in the |
1336 | 2095 // constraint table. The element classes are. |
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2096 FieldArrayInfo fd; |
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2097 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(false)); |
1336 | 2098 // primitive types always pass |
2099 if (t != T_OBJECT) { | |
2100 return true; | |
2101 } else { | |
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2102 constraint_name = fd.object_key(); |
1336 | 2103 } |
2104 } | |
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2105 unsigned int d_hash1 = dictionary()->compute_hash(constraint_name, loader_data1); |
0 | 2106 int d_index1 = dictionary()->hash_to_index(d_hash1); |
2107 | |
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2108 unsigned int d_hash2 = dictionary()->compute_hash(constraint_name, loader_data2); |
0 | 2109 int d_index2 = dictionary()->hash_to_index(d_hash2); |
2110 { | |
1336 | 2111 MutexLocker mu_s(SystemDictionary_lock, THREAD); |
0 | 2112 |
1336 | 2113 // Better never do a GC while we're holding these oops |
2114 No_Safepoint_Verifier nosafepoint; | |
0 | 2115 |
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2116 Klass* klass1 = find_class(d_index1, d_hash1, constraint_name, loader_data1); |
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2117 Klass* klass2 = find_class(d_index2, d_hash2, constraint_name, loader_data2); |
1336 | 2118 return constraints()->add_entry(constraint_name, klass1, class_loader1, |
2119 klass2, class_loader2); | |
0 | 2120 } |
2121 } | |
2122 | |
2123 // Add entry to resolution error table to record the error when the first | |
2124 // attempt to resolve a reference to a class has failed. | |
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2125 void SystemDictionary::add_resolution_error(constantPoolHandle pool, int which, Symbol* error) { |
0 | 2126 unsigned int hash = resolution_errors()->compute_hash(pool, which); |
2127 int index = resolution_errors()->hash_to_index(hash); | |
2128 { | |
2129 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
2130 resolution_errors()->add_entry(index, hash, pool, which, error); | |
2131 } | |
2132 } | |
2133 | |
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2134 // Delete a resolution error for RedefineClasses for a constant pool is going away |
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2135 void SystemDictionary::delete_resolution_error(ConstantPool* pool) { |
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2136 resolution_errors()->delete_entry(pool); |
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2137 } |
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2138 |
0 | 2139 // Lookup resolution error table. Returns error if found, otherwise NULL. |
2177
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2140 Symbol* SystemDictionary::find_resolution_error(constantPoolHandle pool, int which) { |
0 | 2141 unsigned int hash = resolution_errors()->compute_hash(pool, which); |
2142 int index = resolution_errors()->hash_to_index(hash); | |
2143 { | |
2144 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
2145 ResolutionErrorEntry* entry = resolution_errors()->find_entry(index, hash, pool, which); | |
2177
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2146 return (entry != NULL) ? entry->error() : (Symbol*)NULL; |
0 | 2147 } |
2148 } | |
2149 | |
2150 | |
665
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2151 // Signature constraints ensure that callers and callees agree about |
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2152 // the meaning of type names in their signatures. This routine is the |
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2153 // intake for constraints. It collects them from several places: |
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2154 // |
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2155 // * LinkResolver::resolve_method (if check_access is true) requires |
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2156 // that the resolving class (the caller) and the defining class of |
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2157 // the resolved method (the callee) agree on each type in the |
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2158 // method's signature. |
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2159 // |
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2160 // * LinkResolver::resolve_interface_method performs exactly the same |
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2161 // checks. |
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2162 // |
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2163 // * LinkResolver::resolve_field requires that the constant pool |
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2164 // attempting to link to a field agree with the field's defining |
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2165 // class about the type of the field signature. |
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2166 // |
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2167 // * klassVtable::initialize_vtable requires that, when a class |
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2168 // overrides a vtable entry allocated by a superclass, that the |
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2169 // overriding method (i.e., the callee) agree with the superclass |
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2170 // on each type in the method's signature. |
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2171 // |
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2172 // * klassItable::initialize_itable requires that, when a class fills |
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2173 // in its itables, for each non-abstract method installed in an |
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2174 // itable, the method (i.e., the callee) agree with the interface |
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2175 // on each type in the method's signature. |
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2176 // |
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2177 // All those methods have a boolean (check_access, checkconstraints) |
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2178 // which turns off the checks. This is used from specialized contexts |
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2179 // such as bootstrapping, dumping, and debugging. |
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2180 // |
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2181 // No direct constraint is placed between the class and its |
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2182 // supertypes. Constraints are only placed along linked relations |
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2183 // between callers and callees. When a method overrides or implements |
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2184 // an abstract method in a supertype (superclass or interface), the |
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2185 // constraints are placed as if the supertype were the caller to the |
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2186 // overriding method. (This works well, since callers to the |
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2187 // supertype have already established agreement between themselves and |
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2188 // the supertype.) As a result of all this, a class can disagree with |
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2189 // its supertype about the meaning of a type name, as long as that |
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2190 // class neither calls a relevant method of the supertype, nor is |
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2191 // called (perhaps via an override) from the supertype. |
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2192 // |
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2193 // |
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2194 // SystemDictionary::check_signature_loaders(sig, l1, l2) |
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2195 // |
0 | 2196 // Make sure all class components (including arrays) in the given |
2197 // signature will be resolved to the same class in both loaders. | |
2198 // Returns the name of the type that failed a loader constraint check, or | |
2199 // NULL if no constraint failed. The returned C string needs cleaning up | |
665
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2200 // with a ResourceMark in the caller. No exception except OOME is thrown. |
1336 | 2201 // Arrays are not added to the loader constraint table, their elements are. |
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2202 char* SystemDictionary::check_signature_loaders(Symbol* signature, |
0 | 2203 Handle loader1, Handle loader2, |
2204 bool is_method, TRAPS) { | |
2205 // Nothing to do if loaders are the same. | |
2206 if (loader1() == loader2()) { | |
2207 return NULL; | |
2208 } | |
2209 | |
2177
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2210 ResourceMark rm(THREAD); |
0 | 2211 SignatureStream sig_strm(signature, is_method); |
2212 while (!sig_strm.is_done()) { | |
2213 if (sig_strm.is_object()) { | |
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2214 Symbol* s = sig_strm.as_symbol(CHECK_NULL); |
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2215 Symbol* sig = s; |
0 | 2216 if (!add_loader_constraint(sig, loader1, loader2, THREAD)) { |
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2217 return sig->as_C_string(); |
0 | 2218 } |
2219 } | |
2220 sig_strm.next(); | |
2221 } | |
2222 return NULL; | |
2223 } | |
2224 | |
2225 | |
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2226 methodHandle SystemDictionary::find_method_handle_intrinsic(vmIntrinsics::ID iid, |
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2227 Symbol* signature, |
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2228 TRAPS) { |
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2229 methodHandle empty; |
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2230 assert(EnableInvokeDynamic, ""); |
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2231 assert(MethodHandles::is_signature_polymorphic(iid) && |
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2232 MethodHandles::is_signature_polymorphic_intrinsic(iid) && |
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2233 iid != vmIntrinsics::_invokeGeneric, |
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2234 err_msg("must be a known MH intrinsic iid=%d: %s", iid, vmIntrinsics::name_at(iid))); |
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2235 |
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2236 unsigned int hash = invoke_method_table()->compute_hash(signature, iid); |
710 | 2237 int index = invoke_method_table()->hash_to_index(hash); |
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2238 SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, iid); |
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2239 methodHandle m; |
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2240 if (spe == NULL || spe->method() == NULL) { |
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2241 spe = NULL; |
710 | 2242 // Must create lots of stuff here, but outside of the SystemDictionary lock. |
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2243 m = Method::make_method_handle_intrinsic(iid, signature, CHECK_(empty)); |
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2244 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_highest_tier, |
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2245 methodHandle(), CompileThreshold, "MH", CHECK_(empty)); |
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2246 |
710 | 2247 // Now grab the lock. We might have to throw away the new method, |
2248 // if a racing thread has managed to install one at the same time. | |
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2249 { |
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2250 MutexLocker ml(SystemDictionary_lock, THREAD); |
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2251 spe = invoke_method_table()->find_entry(index, hash, signature, iid); |
710 | 2252 if (spe == NULL) |
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2253 spe = invoke_method_table()->add_entry(index, hash, signature, iid); |
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2254 if (spe->method() == NULL) |
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2255 spe->set_method(m()); |
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2256 } |
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2257 } |
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2258 |
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2259 assert(spe != NULL && spe->method() != NULL, ""); |
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2260 return spe->method(); |
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2261 } |
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2262 |
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2263 // Helper for unpacking the return value from linkMethod and linkCallSite. |
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2264 static methodHandle unpack_method_and_appendix(Handle mname, |
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2265 KlassHandle accessing_klass, |
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2266 objArrayHandle appendix_box, |
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2267 Handle* appendix_result, |
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2268 TRAPS) { |
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2269 methodHandle empty; |
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2270 if (mname.not_null()) { |
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2271 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); |
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2272 if (vmtarget != NULL && vmtarget->is_method()) { |
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2273 Method* m = (Method*)vmtarget; |
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2274 oop appendix = appendix_box->obj_at(0); |
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2275 if (TraceMethodHandles) { |
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2276 #ifndef PRODUCT |
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2277 tty->print("Linked method="INTPTR_FORMAT": ", m); |
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2278 m->print(); |
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2279 if (appendix != NULL) { tty->print("appendix = "); appendix->print(); } |
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2280 tty->cr(); |
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2281 #endif //PRODUCT |
3363
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2282 } |
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2283 (*appendix_result) = Handle(THREAD, appendix); |
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2284 // the target is stored in the cpCache and if a reference to this |
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2285 // MethodName is dropped we need a way to make sure the |
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2286 // class_loader containing this method is kept alive. |
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2287 // FIXME: the appendix might also preserve this dependency. |
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2288 ClassLoaderData* this_key = InstanceKlass::cast(accessing_klass())->class_loader_data(); |
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2289 this_key->record_dependency(m->method_holder(), CHECK_NULL); // Can throw OOM |
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2290 return methodHandle(THREAD, m); |
710 | 2291 } |
2292 } | |
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2293 THROW_MSG_(vmSymbols::java_lang_LinkageError(), "bad value from MethodHandleNatives", empty); |
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2294 return empty; |
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2295 } |
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2296 |
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2297 methodHandle SystemDictionary::find_method_handle_invoker(Symbol* name, |
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2298 Symbol* signature, |
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2299 KlassHandle accessing_klass, |
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2300 Handle *appendix_result, |
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2301 Handle *method_type_result, |
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2302 TRAPS) { |
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2303 methodHandle empty; |
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2304 assert(EnableInvokeDynamic, ""); |
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2305 assert(!THREAD->is_Compiler_thread(), ""); |
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2306 Handle method_type = |
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2307 SystemDictionary::find_method_handle_type(signature, accessing_klass, CHECK_(empty)); |
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2308 if (false) { // FIXME: Decide if the Java upcall should resolve signatures. |
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2309 method_type = java_lang_String::create_from_symbol(signature, CHECK_(empty)); |
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2310 } |
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2311 |
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2312 KlassHandle mh_klass = SystemDictionary::MethodHandle_klass(); |
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2313 int ref_kind = JVM_REF_invokeVirtual; |
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2314 Handle name_str = StringTable::intern(name, CHECK_(empty)); |
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2315 objArrayHandle appendix_box = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1, CHECK_(empty)); |
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2316 assert(appendix_box->obj_at(0) == NULL, ""); |
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2317 |
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2318 // call java.lang.invoke.MethodHandleNatives::linkMethod(... String, MethodType) -> MemberName |
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2319 JavaCallArguments args; |
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2320 args.push_oop(accessing_klass()->java_mirror()); |
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2321 args.push_int(ref_kind); |
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2322 args.push_oop(mh_klass()->java_mirror()); |
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2323 args.push_oop(name_str()); |
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2324 args.push_oop(method_type()); |
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2325 args.push_oop(appendix_box()); |
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2326 JavaValue result(T_OBJECT); |
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2327 JavaCalls::call_static(&result, |
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2328 SystemDictionary::MethodHandleNatives_klass(), |
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2329 vmSymbols::linkMethod_name(), |
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2330 vmSymbols::linkMethod_signature(), |
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2331 &args, CHECK_(empty)); |
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2332 Handle mname(THREAD, (oop) result.get_jobject()); |
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2333 (*method_type_result) = method_type; |
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2334 return unpack_method_and_appendix(mname, accessing_klass, appendix_box, appendix_result, THREAD); |
710 | 2335 } |
2336 | |
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2337 |
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2338 // Ask Java code to find or construct a java.lang.invoke.MethodType for the given |
710 | 2339 // signature, as interpreted relative to the given class loader. |
2340 // Because of class loader constraints, all method handle usage must be | |
2341 // consistent with this loader. | |
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2342 Handle SystemDictionary::find_method_handle_type(Symbol* signature, |
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2343 KlassHandle accessing_klass, |
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2344 TRAPS) { |
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2345 Handle empty; |
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2346 vmIntrinsics::ID null_iid = vmIntrinsics::_none; // distinct from all method handle invoker intrinsics |
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2347 unsigned int hash = invoke_method_table()->compute_hash(signature, null_iid); |
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2348 int index = invoke_method_table()->hash_to_index(hash); |
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2349 SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, null_iid); |
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2350 if (spe != NULL && spe->method_type() != NULL) { |
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2351 assert(java_lang_invoke_MethodType::is_instance(spe->method_type()), ""); |
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2352 return Handle(THREAD, spe->method_type()); |
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2353 } else if (THREAD->is_Compiler_thread()) { |
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2354 warning("SystemDictionary::find_method_handle_type called from compiler thread"); // FIXME |
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2355 return Handle(); // do not attempt from within compiler, unless it was cached |
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2356 } |
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2357 |
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2358 Handle class_loader, protection_domain; |
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2359 bool is_on_bcp = true; // keep this true as long as we can materialize from the boot classloader |
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2360 int npts = ArgumentCount(signature).size(); |
1142 | 2361 objArrayHandle pts = oopFactory::new_objArray(SystemDictionary::Class_klass(), npts, CHECK_(empty)); |
710 | 2362 int arg = 0; |
2363 Handle rt; // the return type from the signature | |
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2364 ResourceMark rm(THREAD); |
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2365 for (SignatureStream ss(signature); !ss.is_done(); ss.next()) { |
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2366 oop mirror = NULL; |
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2367 if (is_on_bcp) { |
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2368 // Note: class_loader & protection_domain are both null at this point. |
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2369 mirror = ss.as_java_mirror(class_loader, protection_domain, |
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2370 SignatureStream::ReturnNull, CHECK_(empty)); |
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2371 if (mirror == NULL) { |
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2372 // fall back from BCP to accessing_klass |
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2373 if (accessing_klass.not_null()) { |
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2374 class_loader = Handle(THREAD, InstanceKlass::cast(accessing_klass())->class_loader()); |
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2375 protection_domain = Handle(THREAD, InstanceKlass::cast(accessing_klass())->protection_domain()); |
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2376 } |
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2377 is_on_bcp = false; |
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2378 } |
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2379 } |
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2380 if (!is_on_bcp) { |
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2381 // Resolve, throwing a real error if it doesn't work. |
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2382 mirror = ss.as_java_mirror(class_loader, protection_domain, |
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2383 SignatureStream::NCDFError, CHECK_(empty)); |
710 | 2384 } |
2385 if (ss.at_return_type()) | |
2386 rt = Handle(THREAD, mirror); | |
2387 else | |
2388 pts->obj_at_put(arg++, mirror); | |
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2389 |
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2390 // Check accessibility. |
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2391 if (ss.is_object() && accessing_klass.not_null()) { |
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2392 Klass* sel_klass = java_lang_Class::as_Klass(mirror); |
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2393 mirror = NULL; // safety |
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2394 // Emulate ConstantPool::verify_constant_pool_resolve. |
6983 | 2395 if (sel_klass->oop_is_objArray()) |
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2396 sel_klass = ObjArrayKlass::cast(sel_klass)->bottom_klass(); |
6983 | 2397 if (sel_klass->oop_is_instance()) { |
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2398 KlassHandle sel_kh(THREAD, sel_klass); |
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2399 LinkResolver::check_klass_accessability(accessing_klass, sel_kh, CHECK_(empty)); |
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2400 } |
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2401 } |
710 | 2402 } |
2403 assert(arg == npts, ""); | |
2404 | |
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2405 // call java.lang.invoke.MethodHandleNatives::findMethodType(Class rt, Class[] pts) -> MethodType |
710 | 2406 JavaCallArguments args(Handle(THREAD, rt())); |
2407 args.push_oop(pts()); | |
2408 JavaValue result(T_OBJECT); | |
2409 JavaCalls::call_static(&result, | |
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2410 SystemDictionary::MethodHandleNatives_klass(), |
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2411 vmSymbols::findMethodHandleType_name(), |
2460 | 2412 vmSymbols::findMethodHandleType_signature(), |
710 | 2413 &args, CHECK_(empty)); |
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2414 Handle method_type(THREAD, (oop) result.get_jobject()); |
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2415 |
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2416 if (is_on_bcp) { |
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2417 // We can cache this MethodType inside the JVM. |
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2418 MutexLocker ml(SystemDictionary_lock, THREAD); |
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2419 spe = invoke_method_table()->find_entry(index, hash, signature, null_iid); |
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2420 if (spe == NULL) |
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2421 spe = invoke_method_table()->add_entry(index, hash, signature, null_iid); |
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2422 if (spe->method_type() == NULL) { |
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2423 spe->set_method_type(method_type()); |
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2424 } |
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2425 } |
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6939196: method handle signatures off the boot class path get linkage errors
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2426 |
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2427 // report back to the caller with the MethodType |
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2428 return method_type; |
710 | 2429 } |
2430 | |
1602 | 2431 // Ask Java code to find or construct a method handle constant. |
2432 Handle SystemDictionary::link_method_handle_constant(KlassHandle caller, | |
2433 int ref_kind, //e.g., JVM_REF_invokeVirtual | |
2434 KlassHandle callee, | |
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2435 Symbol* name_sym, |
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2436 Symbol* signature, |
1602 | 2437 TRAPS) { |
2438 Handle empty; | |
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2439 Handle name = java_lang_String::create_from_symbol(name_sym, CHECK_(empty)); |
1602 | 2440 Handle type; |
2441 if (signature->utf8_length() > 0 && signature->byte_at(0) == '(') { | |
6266
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2442 type = find_method_handle_type(signature, caller, CHECK_(empty)); |
1602 | 2443 } else { |
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2444 ResourceMark rm(THREAD); |
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2445 SignatureStream ss(signature, false); |
1602 | 2446 if (!ss.is_done()) { |
2447 oop mirror = ss.as_java_mirror(caller->class_loader(), caller->protection_domain(), | |
2448 SignatureStream::NCDFError, CHECK_(empty)); | |
2449 type = Handle(THREAD, mirror); | |
2450 ss.next(); | |
2451 if (!ss.is_done()) type = Handle(); // error! | |
2452 } | |
2453 } | |
2454 if (type.is_null()) { | |
2455 THROW_MSG_(vmSymbols::java_lang_LinkageError(), "bad signature", empty); | |
2456 } | |
2457 | |
2357
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2458 // call java.lang.invoke.MethodHandleNatives::linkMethodHandleConstant(Class caller, int refKind, Class callee, String name, Object type) -> MethodHandle |
1602 | 2459 JavaCallArguments args; |
2460 args.push_oop(caller->java_mirror()); // the referring class | |
2461 args.push_int(ref_kind); | |
2462 args.push_oop(callee->java_mirror()); // the target class | |
2463 args.push_oop(name()); | |
2464 args.push_oop(type()); | |
2465 JavaValue result(T_OBJECT); | |
2466 JavaCalls::call_static(&result, | |
2467 SystemDictionary::MethodHandleNatives_klass(), | |
2468 vmSymbols::linkMethodHandleConstant_name(), | |
2460 | 2469 vmSymbols::linkMethodHandleConstant_signature(), |
1602 | 2470 &args, CHECK_(empty)); |
2471 return Handle(THREAD, (oop) result.get_jobject()); | |
2472 } | |
710 | 2473 |
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2474 // Ask Java code to find or construct a java.lang.invoke.CallSite for the given |
726
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2475 // name and signature, as interpreted relative to the given class loader. |
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2476 methodHandle SystemDictionary::find_dynamic_call_site_invoker(KlassHandle caller, |
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2477 Handle bootstrap_specifier, |
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2478 Symbol* name, |
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|
2479 Symbol* type, |
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2480 Handle *appendix_result, |
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2481 Handle *method_type_result, |
6266
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|
2482 TRAPS) { |
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|
2483 methodHandle empty; |
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|
2484 Handle bsm, info; |
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2485 if (java_lang_invoke_MethodHandle::is_instance(bootstrap_specifier())) { |
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2486 bsm = bootstrap_specifier; |
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|
2487 } else { |
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|
2488 assert(bootstrap_specifier->is_objArray(), ""); |
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2489 objArrayHandle args(THREAD, (objArrayOop) bootstrap_specifier()); |
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|
2490 int len = args->length(); |
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|
2491 assert(len >= 1, ""); |
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|
2492 bsm = Handle(THREAD, args->obj_at(0)); |
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2493 if (len > 1) { |
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|
2494 objArrayOop args1 = oopFactory::new_objArray(SystemDictionary::Object_klass(), len-1, CHECK_(empty)); |
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2495 for (int i = 1; i < len; i++) |
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2496 args1->obj_at_put(i-1, args->obj_at(i)); |
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|
2497 info = Handle(THREAD, args1); |
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|
2498 } |
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|
2499 } |
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|
2500 guarantee(java_lang_invoke_MethodHandle::is_instance(bsm()), |
1660
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diff
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|
2501 "caller must supply a valid BSM"); |
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|
2502 |
6266
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2503 Handle method_name = java_lang_String::create_from_symbol(name, CHECK_(empty)); |
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2504 Handle method_type = find_method_handle_type(type, caller, CHECK_(empty)); |
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2505 |
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|
2506 objArrayHandle appendix_box = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1, CHECK_(empty)); |
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2507 assert(appendix_box->obj_at(0) == NULL, ""); |
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|
2508 |
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|
2509 // call java.lang.invoke.MethodHandleNatives::linkCallSite(caller, bsm, name, mtype, info, &appendix) |
1d7922586cf6
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|
2510 JavaCallArguments args; |
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|
2511 args.push_oop(caller->java_mirror()); |
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|
2512 args.push_oop(bsm()); |
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|
2513 args.push_oop(method_name()); |
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|
2514 args.push_oop(method_type()); |
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cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
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|
2515 args.push_oop(info()); |
6266
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|
2516 args.push_oop(appendix_box); |
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|
2517 JavaValue result(T_OBJECT); |
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|
2518 JavaCalls::call_static(&result, |
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|
2519 SystemDictionary::MethodHandleNatives_klass(), |
6266
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|
2520 vmSymbols::linkCallSite_name(), |
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|
2521 vmSymbols::linkCallSite_signature(), |
726
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|
2522 &args, CHECK_(empty)); |
6266
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|
2523 Handle mname(THREAD, (oop) result.get_jobject()); |
6822
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|
2524 (*method_type_result) = method_type; |
7185
90273fc0a981
8000662: NPG: nashorn ant clean test262 out-of-memory with Java heap
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6983
diff
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|
2525 return unpack_method_and_appendix(mname, caller, appendix_box, appendix_result, THREAD); |
726
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diff
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|
2526 } |
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|
2527 |
0 | 2528 // Since the identity hash code for symbols changes when the symbols are |
2529 // moved from the regular perm gen (hash in the mark word) to the shared | |
2530 // spaces (hash is the address), the classes loaded into the dictionary | |
2531 // may be in the wrong buckets. | |
2532 | |
2533 void SystemDictionary::reorder_dictionary() { | |
2534 dictionary()->reorder_dictionary(); | |
2535 } | |
2536 | |
2537 | |
2538 void SystemDictionary::copy_buckets(char** top, char* end) { | |
2539 dictionary()->copy_buckets(top, end); | |
2540 } | |
2541 | |
2542 | |
2543 void SystemDictionary::copy_table(char** top, char* end) { | |
2544 dictionary()->copy_table(top, end); | |
2545 } | |
2546 | |
2547 | |
2548 void SystemDictionary::reverse() { | |
2549 dictionary()->reverse(); | |
2550 } | |
2551 | |
2552 int SystemDictionary::number_of_classes() { | |
2553 return dictionary()->number_of_entries(); | |
2554 } | |
2555 | |
2556 | |
2557 // ---------------------------------------------------------------------------- | |
2558 #ifndef PRODUCT | |
2559 | |
2560 void SystemDictionary::print() { | |
2561 dictionary()->print(); | |
2562 | |
2563 // Placeholders | |
2564 GCMutexLocker mu(SystemDictionary_lock); | |
2565 placeholders()->print(); | |
2566 | |
2567 // loader constraints - print under SD_lock | |
2568 constraints()->print(); | |
2569 } | |
2570 | |
2571 #endif | |
2572 | |
2573 void SystemDictionary::verify() { | |
2574 guarantee(dictionary() != NULL, "Verify of system dictionary failed"); | |
2575 guarantee(constraints() != NULL, | |
2576 "Verify of loader constraints failed"); | |
2577 guarantee(dictionary()->number_of_entries() >= 0 && | |
2578 placeholders()->number_of_entries() >= 0, | |
2579 "Verify of system dictionary failed"); | |
2580 | |
2581 // Verify dictionary | |
2582 dictionary()->verify(); | |
2583 | |
2584 GCMutexLocker mu(SystemDictionary_lock); | |
2585 placeholders()->verify(); | |
2586 | |
2587 // Verify constraint table | |
2588 guarantee(constraints() != NULL, "Verify of loader constraints failed"); | |
1258
38836cf1d8d2
6920977: G1: guarantee(k == probe->klass(),"klass should be in dictionary") fails
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1142
diff
changeset
|
2589 constraints()->verify(dictionary(), placeholders()); |
0 | 2590 } |
2591 | |
2592 | |
6725
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|
2593 void SystemDictionary::verify_obj_klass_present(Symbol* class_name, |
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|
2594 ClassLoaderData* loader_data) { |
0 | 2595 GCMutexLocker mu(SystemDictionary_lock); |
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|
2596 Symbol* name; |
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|
2597 |
6725
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|
2598 Klass* probe = find_class(class_name, loader_data); |
0 | 2599 if (probe == NULL) { |
2600 probe = SystemDictionary::find_shared_class(class_name); | |
2177
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|
2601 if (probe == NULL) { |
6725
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|
2602 name = find_placeholder(class_name, loader_data); |
2177
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|
2603 } |
0 | 2604 } |
2177
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|
2605 guarantee(probe != NULL || name != NULL, |
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|
2606 "Loaded klasses should be in SystemDictionary"); |
0 | 2607 } |
2608 | |
2609 #ifndef PRODUCT | |
2610 | |
2611 // statistics code | |
2612 class ClassStatistics: AllStatic { | |
2613 private: | |
2614 static int nclasses; // number of classes | |
2615 static int nmethods; // number of methods | |
2616 static int nmethoddata; // number of methodData | |
2617 static int class_size; // size of class objects in words | |
2618 static int method_size; // size of method objects in words | |
2619 static int debug_size; // size of debug info in methods | |
2620 static int methoddata_size; // size of methodData objects in words | |
2621 | |
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|
2622 static void do_class(Klass* k) { |
0 | 2623 nclasses++; |
2624 class_size += k->size(); | |
6725
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|
2625 if (k->oop_is_instance()) { |
da91efe96a93
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coleenp
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|
2626 InstanceKlass* ik = (InstanceKlass*)k; |
0 | 2627 class_size += ik->methods()->size(); |
2628 class_size += ik->constants()->size(); | |
2629 class_size += ik->local_interfaces()->size(); | |
2630 class_size += ik->transitive_interfaces()->size(); | |
2631 // We do not have to count implementors, since we only store one! | |
6725
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|
2632 // SSS: How should these be accounted now that they have moved? |
da91efe96a93
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|
2633 // class_size += ik->fields()->length(); |
0 | 2634 } |
2635 } | |
2636 | |
6725
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|
2637 static void do_method(Method* m) { |
0 | 2638 nmethods++; |
2639 method_size += m->size(); | |
2640 // class loader uses same objArray for empty vectors, so don't count these | |
2641 if (m->has_stackmap_table()) { | |
2642 method_size += m->stackmap_data()->size(); | |
2643 } | |
2644 | |
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|
2645 MethodData* mdo = m->method_data(); |
0 | 2646 if (mdo != NULL) { |
2647 nmethoddata++; | |
2648 methoddata_size += mdo->size(); | |
2649 } | |
2650 } | |
2651 | |
2652 public: | |
2653 static void print() { | |
2654 SystemDictionary::classes_do(do_class); | |
2655 SystemDictionary::methods_do(do_method); | |
2656 tty->print_cr("Class statistics:"); | |
2657 tty->print_cr("%d classes (%d bytes)", nclasses, class_size * oopSize); | |
2658 tty->print_cr("%d methods (%d bytes = %d base + %d debug info)", nmethods, | |
2659 (method_size + debug_size) * oopSize, method_size * oopSize, debug_size * oopSize); | |
2660 tty->print_cr("%d methoddata (%d bytes)", nmethoddata, methoddata_size * oopSize); | |
2661 } | |
2662 }; | |
2663 | |
2664 | |
2665 int ClassStatistics::nclasses = 0; | |
2666 int ClassStatistics::nmethods = 0; | |
2667 int ClassStatistics::nmethoddata = 0; | |
2668 int ClassStatistics::class_size = 0; | |
2669 int ClassStatistics::method_size = 0; | |
2670 int ClassStatistics::debug_size = 0; | |
2671 int ClassStatistics::methoddata_size = 0; | |
2672 | |
2673 void SystemDictionary::print_class_statistics() { | |
2674 ResourceMark rm; | |
2675 ClassStatistics::print(); | |
2676 } | |
2677 | |
2678 | |
2679 class MethodStatistics: AllStatic { | |
2680 public: | |
2681 enum { | |
2682 max_parameter_size = 10 | |
2683 }; | |
2684 private: | |
2685 | |
2686 static int _number_of_methods; | |
2687 static int _number_of_final_methods; | |
2688 static int _number_of_static_methods; | |
2689 static int _number_of_native_methods; | |
2690 static int _number_of_synchronized_methods; | |
2691 static int _number_of_profiled_methods; | |
2692 static int _number_of_bytecodes; | |
2693 static int _parameter_size_profile[max_parameter_size]; | |
2694 static int _bytecodes_profile[Bytecodes::number_of_java_codes]; | |
2695 | |
2696 static void initialize() { | |
2697 _number_of_methods = 0; | |
2698 _number_of_final_methods = 0; | |
2699 _number_of_static_methods = 0; | |
2700 _number_of_native_methods = 0; | |
2701 _number_of_synchronized_methods = 0; | |
2702 _number_of_profiled_methods = 0; | |
2703 _number_of_bytecodes = 0; | |
2704 for (int i = 0; i < max_parameter_size ; i++) _parameter_size_profile[i] = 0; | |
2705 for (int j = 0; j < Bytecodes::number_of_java_codes; j++) _bytecodes_profile [j] = 0; | |
2706 }; | |
2707 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
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2708 static void do_method(Method* m) { |
0 | 2709 _number_of_methods++; |
2710 // collect flag info | |
2711 if (m->is_final() ) _number_of_final_methods++; | |
2712 if (m->is_static() ) _number_of_static_methods++; | |
2713 if (m->is_native() ) _number_of_native_methods++; | |
2714 if (m->is_synchronized()) _number_of_synchronized_methods++; | |
2715 if (m->method_data() != NULL) _number_of_profiled_methods++; | |
2716 // collect parameter size info (add one for receiver, if any) | |
2717 _parameter_size_profile[MIN2(m->size_of_parameters() + (m->is_static() ? 0 : 1), max_parameter_size - 1)]++; | |
2718 // collect bytecodes info | |
2719 { | |
2720 Thread *thread = Thread::current(); | |
2721 HandleMark hm(thread); | |
2722 BytecodeStream s(methodHandle(thread, m)); | |
2723 Bytecodes::Code c; | |
2724 while ((c = s.next()) >= 0) { | |
2725 _number_of_bytecodes++; | |
2726 _bytecodes_profile[c]++; | |
2727 } | |
2728 } | |
2729 } | |
2730 | |
2731 public: | |
2732 static void print() { | |
2733 initialize(); | |
2734 SystemDictionary::methods_do(do_method); | |
2735 // generate output | |
2736 tty->cr(); | |
2737 tty->print_cr("Method statistics (static):"); | |
2738 // flag distribution | |
2739 tty->cr(); | |
2740 tty->print_cr("%6d final methods %6.1f%%", _number_of_final_methods , _number_of_final_methods * 100.0F / _number_of_methods); | |
2741 tty->print_cr("%6d static methods %6.1f%%", _number_of_static_methods , _number_of_static_methods * 100.0F / _number_of_methods); | |
2742 tty->print_cr("%6d native methods %6.1f%%", _number_of_native_methods , _number_of_native_methods * 100.0F / _number_of_methods); | |
2743 tty->print_cr("%6d synchronized methods %6.1f%%", _number_of_synchronized_methods, _number_of_synchronized_methods * 100.0F / _number_of_methods); | |
2744 tty->print_cr("%6d profiled methods %6.1f%%", _number_of_profiled_methods, _number_of_profiled_methods * 100.0F / _number_of_methods); | |
2745 // parameter size profile | |
2746 tty->cr(); | |
2747 { int tot = 0; | |
2748 int avg = 0; | |
2749 for (int i = 0; i < max_parameter_size; i++) { | |
2750 int n = _parameter_size_profile[i]; | |
2751 tot += n; | |
2752 avg += n*i; | |
2753 tty->print_cr("parameter size = %1d: %6d methods %5.1f%%", i, n, n * 100.0F / _number_of_methods); | |
2754 } | |
2755 assert(tot == _number_of_methods, "should be the same"); | |
2756 tty->print_cr(" %6d methods 100.0%%", _number_of_methods); | |
2757 tty->print_cr("(average parameter size = %3.1f including receiver, if any)", (float)avg / _number_of_methods); | |
2758 } | |
2759 // bytecodes profile | |
2760 tty->cr(); | |
2761 { int tot = 0; | |
2762 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) { | |
2763 if (Bytecodes::is_defined(i)) { | |
2764 Bytecodes::Code c = Bytecodes::cast(i); | |
2765 int n = _bytecodes_profile[c]; | |
2766 tot += n; | |
2767 tty->print_cr("%9d %7.3f%% %s", n, n * 100.0F / _number_of_bytecodes, Bytecodes::name(c)); | |
2768 } | |
2769 } | |
2770 assert(tot == _number_of_bytecodes, "should be the same"); | |
2771 tty->print_cr("%9d 100.000%%", _number_of_bytecodes); | |
2772 } | |
2773 tty->cr(); | |
2774 } | |
2775 }; | |
2776 | |
2777 int MethodStatistics::_number_of_methods; | |
2778 int MethodStatistics::_number_of_final_methods; | |
2779 int MethodStatistics::_number_of_static_methods; | |
2780 int MethodStatistics::_number_of_native_methods; | |
2781 int MethodStatistics::_number_of_synchronized_methods; | |
2782 int MethodStatistics::_number_of_profiled_methods; | |
2783 int MethodStatistics::_number_of_bytecodes; | |
2784 int MethodStatistics::_parameter_size_profile[MethodStatistics::max_parameter_size]; | |
2785 int MethodStatistics::_bytecodes_profile[Bytecodes::number_of_java_codes]; | |
2786 | |
2787 | |
2788 void SystemDictionary::print_method_statistics() { | |
2789 MethodStatistics::print(); | |
2790 } | |
2791 | |
2792 #endif // PRODUCT |