Mercurial > hg > graal-jvmci-8
annotate src/share/vm/classfile/systemDictionary.cpp @ 7949:5daaddd917a1
8006040: NPG: on_stack processing wastes space in ConstantPool
Summary: Added on_stack bit to flags. Also MetadataMarkOnStack is used for more than JVMTI so had to be moved.
Reviewed-by: dholmes, stefank
author | coleenp |
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date | Wed, 23 Jan 2013 10:34:29 -0500 |
parents | aefb345d3f5e |
children | 3ac7d10a6572 8b46b0196eb0 |
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 // ---------------------------------------------------------------------------- |
0 | 150 // Resolving of classes |
151 | |
152 // Forwards to resolve_or_null | |
153 | |
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154 Klass* SystemDictionary::resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS) { |
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155 Klass* klass = resolve_or_null(class_name, class_loader, protection_domain, THREAD); |
0 | 156 if (HAS_PENDING_EXCEPTION || klass == NULL) { |
157 KlassHandle k_h(THREAD, klass); | |
158 // can return a null klass | |
159 klass = handle_resolution_exception(class_name, class_loader, protection_domain, throw_error, k_h, THREAD); | |
160 } | |
161 return klass; | |
162 } | |
163 | |
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164 Klass* SystemDictionary::handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS) { |
0 | 165 if (HAS_PENDING_EXCEPTION) { |
166 // If we have a pending exception we forward it to the caller, unless throw_error is true, | |
167 // in which case we have to check whether the pending exception is a ClassNotFoundException, | |
168 // and if so convert it to a NoClassDefFoundError | |
169 // And chain the original ClassNotFoundException | |
1142 | 170 if (throw_error && PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass())) { |
0 | 171 ResourceMark rm(THREAD); |
172 assert(klass_h() == NULL, "Should not have result with exception pending"); | |
173 Handle e(THREAD, PENDING_EXCEPTION); | |
174 CLEAR_PENDING_EXCEPTION; | |
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175 THROW_MSG_CAUSE_NULL(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string(), e); |
0 | 176 } else { |
177 return NULL; | |
178 } | |
179 } | |
180 // Class not found, throw appropriate error or exception depending on value of throw_error | |
181 if (klass_h() == NULL) { | |
182 ResourceMark rm(THREAD); | |
183 if (throw_error) { | |
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184 THROW_MSG_NULL(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string()); |
0 | 185 } else { |
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186 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), class_name->as_C_string()); |
0 | 187 } |
188 } | |
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189 return (Klass*)klass_h(); |
0 | 190 } |
191 | |
192 | |
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193 Klass* SystemDictionary::resolve_or_fail(Symbol* class_name, |
0 | 194 bool throw_error, TRAPS) |
195 { | |
196 return resolve_or_fail(class_name, Handle(), Handle(), throw_error, THREAD); | |
197 } | |
198 | |
199 | |
200 // Forwards to resolve_instance_class_or_null | |
201 | |
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202 Klass* SystemDictionary::resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS) { |
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203 assert(!THREAD->is_Compiler_thread(), |
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204 err_msg("can not load classes with compiler thread: class=%s, classloader=%s", |
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205 class_name->as_C_string(), |
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206 class_loader.is_null() ? "null" : class_loader->klass()->name()->as_C_string())); |
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207 if (FieldType::is_array(class_name)) { |
0 | 208 return resolve_array_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); |
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209 } else if (FieldType::is_obj(class_name)) { |
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210 ResourceMark rm(THREAD); |
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211 // Ignore wrapping L and ;. |
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212 TempNewSymbol name = SymbolTable::new_symbol(class_name->as_C_string() + 1, |
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213 class_name->utf8_length() - 2, CHECK_NULL); |
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214 return resolve_instance_class_or_null(name, class_loader, protection_domain, CHECK_NULL); |
0 | 215 } else { |
216 return resolve_instance_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); | |
217 } | |
218 } | |
219 | |
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220 Klass* SystemDictionary::resolve_or_null(Symbol* class_name, TRAPS) { |
0 | 221 return resolve_or_null(class_name, Handle(), Handle(), THREAD); |
222 } | |
223 | |
224 // Forwards to resolve_instance_class_or_null | |
225 | |
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226 Klass* SystemDictionary::resolve_array_class_or_null(Symbol* class_name, |
0 | 227 Handle class_loader, |
228 Handle protection_domain, | |
229 TRAPS) { | |
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230 assert(FieldType::is_array(class_name), "must be array"); |
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231 Klass* k = NULL; |
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232 FieldArrayInfo fd; |
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233 // dimension and object_key in FieldArrayInfo are assigned as a side-effect |
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234 // of this call |
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235 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_NULL); |
0 | 236 if (t == T_OBJECT) { |
237 // naked oop "k" is OK here -- we assign back into it | |
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238 k = SystemDictionary::resolve_instance_class_or_null(fd.object_key(), |
0 | 239 class_loader, |
240 protection_domain, | |
241 CHECK_NULL); | |
242 if (k != NULL) { | |
6983 | 243 k = k->array_klass(fd.dimension(), CHECK_NULL); |
0 | 244 } |
245 } else { | |
246 k = Universe::typeArrayKlassObj(t); | |
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247 k = TypeArrayKlass::cast(k)->array_klass(fd.dimension(), CHECK_NULL); |
0 | 248 } |
249 return k; | |
250 } | |
251 | |
252 | |
253 // Must be called for any super-class or super-interface resolution | |
254 // during class definition to allow class circularity checking | |
255 // super-interface callers: | |
256 // parse_interfaces - for defineClass & jvmtiRedefineClasses | |
257 // super-class callers: | |
258 // ClassFileParser - for defineClass & jvmtiRedefineClasses | |
259 // load_shared_class - while loading a class from shared archive | |
514 | 260 // resolve_instance_class_or_null: |
261 // via: handle_parallel_super_load | |
0 | 262 // when resolving a class that has an existing placeholder with |
263 // a saved superclass [i.e. a defineClass is currently in progress] | |
264 // if another thread is trying to resolve the class, it must do | |
265 // super-class checks on its own thread to catch class circularity | |
266 // This last call is critical in class circularity checking for cases | |
267 // where classloading is delegated to different threads and the | |
268 // classloader lock is released. | |
269 // Take the case: Base->Super->Base | |
270 // 1. If thread T1 tries to do a defineClass of class Base | |
271 // resolve_super_or_fail creates placeholder: T1, Base (super Super) | |
272 // 2. resolve_instance_class_or_null does not find SD or placeholder for Super | |
273 // so it tries to load Super | |
274 // 3. If we load the class internally, or user classloader uses same thread | |
275 // loadClassFromxxx or defineClass via parseClassFile Super ... | |
276 // 3.1 resolve_super_or_fail creates placeholder: T1, Super (super Base) | |
277 // 3.3 resolve_instance_class_or_null Base, finds placeholder for Base | |
278 // 3.4 calls resolve_super_or_fail Base | |
279 // 3.5 finds T1,Base -> throws class circularity | |
280 //OR 4. If T2 tries to resolve Super via defineClass Super ... | |
281 // 4.1 resolve_super_or_fail creates placeholder: T2, Super (super Base) | |
282 // 4.2 resolve_instance_class_or_null Base, finds placeholder for Base (super Super) | |
283 // 4.3 calls resolve_super_or_fail Super in parallel on own thread T2 | |
284 // 4.4 finds T2, Super -> throws class circularity | |
285 // Must be called, even if superclass is null, since this is | |
286 // where the placeholder entry is created which claims this | |
287 // thread is loading this class/classloader. | |
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288 Klass* SystemDictionary::resolve_super_or_fail(Symbol* child_name, |
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289 Symbol* class_name, |
0 | 290 Handle class_loader, |
291 Handle protection_domain, | |
292 bool is_superclass, | |
293 TRAPS) { | |
294 // Double-check, if child class is already loaded, just return super-class,interface | |
295 // Don't add a placedholder if already loaded, i.e. already in system dictionary | |
296 // Make sure there's a placeholder for the *child* before resolving. | |
297 // Used as a claim that this thread is currently loading superclass/classloader | |
298 // Used here for ClassCircularity checks and also for heap verification | |
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299 // (every InstanceKlass in the heap needs to be in the system dictionary |
0 | 300 // or have a placeholder). |
301 // Must check ClassCircularity before checking if super class is already loaded | |
302 // | |
303 // We might not already have a placeholder if this child_name was | |
304 // first seen via resolve_from_stream (jni_DefineClass or JVM_DefineClass); | |
305 // the name of the class might not be known until the stream is actually | |
306 // parsed. | |
307 // Bugs 4643874, 4715493 | |
308 // compute_hash can have a safepoint | |
309 | |
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310 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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311 unsigned int d_hash = dictionary()->compute_hash(child_name, loader_data); |
0 | 312 int d_index = dictionary()->hash_to_index(d_hash); |
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313 unsigned int p_hash = placeholders()->compute_hash(child_name, loader_data); |
0 | 314 int p_index = placeholders()->hash_to_index(p_hash); |
315 // can't throw error holding a lock | |
316 bool child_already_loaded = false; | |
317 bool throw_circularity_error = false; | |
318 { | |
319 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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320 Klass* childk = find_class(d_index, d_hash, child_name, loader_data); |
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321 Klass* quicksuperk; |
0 | 322 // to support // loading: if child done loading, just return superclass |
323 // if class_name, & class_loader don't match: | |
324 // if initial define, SD update will give LinkageError | |
325 // if redefine: compare_class_versions will give HIERARCHY_CHANGED | |
326 // so we don't throw an exception here. | |
327 // see: nsk redefclass014 & java.lang.instrument Instrument032 | |
328 if ((childk != NULL ) && (is_superclass) && | |
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329 ((quicksuperk = InstanceKlass::cast(childk)->super()) != NULL) && |
0 | 330 |
6983 | 331 ((quicksuperk->name() == class_name) && |
332 (quicksuperk->class_loader() == class_loader()))) { | |
0 | 333 return quicksuperk; |
334 } else { | |
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335 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, loader_data); |
0 | 336 if (probe && probe->check_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER)) { |
337 throw_circularity_error = true; | |
338 } | |
514 | 339 } |
340 if (!throw_circularity_error) { | |
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341 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, child_name, loader_data, PlaceholderTable::LOAD_SUPER, class_name, THREAD); |
0 | 342 } |
343 } | |
344 if (throw_circularity_error) { | |
345 ResourceMark rm(THREAD); | |
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346 THROW_MSG_NULL(vmSymbols::java_lang_ClassCircularityError(), child_name->as_C_string()); |
0 | 347 } |
348 | |
349 // java.lang.Object should have been found above | |
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350 assert(class_name != NULL, "null super class for resolving"); |
0 | 351 // Resolve the super class or interface, check results on return |
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352 Klass* superk = SystemDictionary::resolve_or_null(class_name, |
0 | 353 class_loader, |
354 protection_domain, | |
355 THREAD); | |
356 | |
357 KlassHandle superk_h(THREAD, superk); | |
358 | |
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359 // Clean up of placeholders moved so that each classloadAction registrar self-cleans up |
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360 // It is no longer necessary to keep the placeholder table alive until update_dictionary |
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361 // or error. GC used to walk the placeholder table as strong roots. |
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362 // The instanceKlass is kept alive because the class loader is on the stack, |
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363 // which keeps the loader_data alive, as well as all instanceKlasses in |
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364 // the loader_data. parseClassFile adds the instanceKlass to loader_data. |
0 | 365 { |
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366 MutexLocker mu(SystemDictionary_lock, THREAD); |
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367 placeholders()->find_and_remove(p_index, p_hash, child_name, loader_data, PlaceholderTable::LOAD_SUPER, THREAD); |
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368 SystemDictionary_lock->notify_all(); |
0 | 369 } |
370 if (HAS_PENDING_EXCEPTION || superk_h() == NULL) { | |
371 // can null superk | |
372 superk_h = KlassHandle(THREAD, handle_resolution_exception(class_name, class_loader, protection_domain, true, superk_h, THREAD)); | |
373 } | |
374 | |
375 return superk_h(); | |
376 } | |
377 | |
378 void SystemDictionary::validate_protection_domain(instanceKlassHandle klass, | |
379 Handle class_loader, | |
380 Handle protection_domain, | |
381 TRAPS) { | |
382 if(!has_checkPackageAccess()) return; | |
383 | |
384 // Now we have to call back to java to check if the initating class has access | |
385 JavaValue result(T_VOID); | |
386 if (TraceProtectionDomainVerification) { | |
387 // Print out trace information | |
388 tty->print_cr("Checking package access"); | |
389 tty->print(" - class loader: "); class_loader()->print_value_on(tty); tty->cr(); | |
390 tty->print(" - protection domain: "); protection_domain()->print_value_on(tty); tty->cr(); | |
391 tty->print(" - loading: "); klass()->print_value_on(tty); tty->cr(); | |
392 } | |
393 | |
1142 | 394 KlassHandle system_loader(THREAD, SystemDictionary::ClassLoader_klass()); |
0 | 395 JavaCalls::call_special(&result, |
396 class_loader, | |
397 system_loader, | |
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398 vmSymbols::checkPackageAccess_name(), |
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399 vmSymbols::class_protectiondomain_signature(), |
0 | 400 Handle(THREAD, klass->java_mirror()), |
401 protection_domain, | |
402 THREAD); | |
403 | |
404 if (TraceProtectionDomainVerification) { | |
405 if (HAS_PENDING_EXCEPTION) { | |
406 tty->print_cr(" -> DENIED !!!!!!!!!!!!!!!!!!!!!"); | |
407 } else { | |
408 tty->print_cr(" -> granted"); | |
409 } | |
410 tty->cr(); | |
411 } | |
412 | |
413 if (HAS_PENDING_EXCEPTION) return; | |
414 | |
415 // If no exception has been thrown, we have validated the protection domain | |
416 // Insert the protection domain of the initiating class into the set. | |
417 { | |
418 // We recalculate the entry here -- we've called out to java since | |
419 // the last time it was calculated. | |
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420 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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421 |
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422 Symbol* kn = klass->name(); |
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423 unsigned int d_hash = dictionary()->compute_hash(kn, loader_data); |
0 | 424 int d_index = dictionary()->hash_to_index(d_hash); |
425 | |
426 MutexLocker mu(SystemDictionary_lock, THREAD); | |
427 { | |
428 // Note that we have an entry, and entries can be deleted only during GC, | |
429 // so we cannot allow GC to occur while we're holding this entry. | |
430 | |
431 // We're using a No_Safepoint_Verifier to catch any place where we | |
432 // might potentially do a GC at all. | |
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433 // Dictionary::do_unloading() asserts that classes in SD are only |
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434 // unloaded at a safepoint. Anonymous classes are not in SD. |
0 | 435 No_Safepoint_Verifier nosafepoint; |
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436 dictionary()->add_protection_domain(d_index, d_hash, klass, loader_data, |
0 | 437 protection_domain, THREAD); |
438 } | |
439 } | |
440 } | |
441 | |
442 // We only get here if this thread finds that another thread | |
443 // has already claimed the placeholder token for the current operation, | |
444 // but that other thread either never owned or gave up the | |
445 // object lock | |
446 // Waits on SystemDictionary_lock to indicate placeholder table updated | |
447 // On return, caller must recheck placeholder table state | |
448 // | |
449 // We only get here if | |
450 // 1) custom classLoader, i.e. not bootstrap classloader | |
451 // 2) UnsyncloadClass not set | |
452 // 3) custom classLoader has broken the class loader objectLock | |
453 // so another thread got here in parallel | |
454 // | |
455 // lockObject must be held. | |
456 // Complicated dance due to lock ordering: | |
457 // Must first release the classloader object lock to | |
458 // allow initial definer to complete the class definition | |
459 // and to avoid deadlock | |
460 // Reclaim classloader lock object with same original recursion count | |
461 // Must release SystemDictionary_lock after notify, since | |
462 // class loader lock must be claimed before SystemDictionary_lock | |
463 // to prevent deadlocks | |
464 // | |
465 // The notify allows applications that did an untimed wait() on | |
466 // the classloader object lock to not hang. | |
467 void SystemDictionary::double_lock_wait(Handle lockObject, TRAPS) { | |
468 assert_lock_strong(SystemDictionary_lock); | |
469 | |
470 bool calledholdinglock | |
471 = ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, lockObject); | |
472 assert(calledholdinglock,"must hold lock for notify"); | |
514 | 473 assert((!(lockObject() == _system_loader_lock_obj) && !is_parallelCapable(lockObject)), "unexpected double_lock_wait"); |
0 | 474 ObjectSynchronizer::notifyall(lockObject, THREAD); |
475 intptr_t recursions = ObjectSynchronizer::complete_exit(lockObject, THREAD); | |
476 SystemDictionary_lock->wait(); | |
477 SystemDictionary_lock->unlock(); | |
478 ObjectSynchronizer::reenter(lockObject, recursions, THREAD); | |
479 SystemDictionary_lock->lock(); | |
480 } | |
481 | |
482 // If the class in is in the placeholder table, class loading is in progress | |
483 // For cases where the application changes threads to load classes, it | |
484 // is critical to ClassCircularity detection that we try loading | |
485 // the superclass on the same thread internally, so we do parallel | |
486 // super class loading here. | |
487 // This also is critical in cases where the original thread gets stalled | |
488 // even in non-circularity situations. | |
489 // Note: must call resolve_super_or_fail even if null super - | |
514 | 490 // to force placeholder entry creation for this class for circularity detection |
0 | 491 // Caller must check for pending exception |
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492 // Returns non-null Klass* if other thread has completed load |
0 | 493 // and we are done, |
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494 // If return null Klass* and no pending exception, the caller must load the class |
0 | 495 instanceKlassHandle SystemDictionary::handle_parallel_super_load( |
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496 Symbol* name, Symbol* superclassname, Handle class_loader, |
0 | 497 Handle protection_domain, Handle lockObject, TRAPS) { |
498 | |
499 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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500 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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501 unsigned int d_hash = dictionary()->compute_hash(name, loader_data); |
0 | 502 int d_index = dictionary()->hash_to_index(d_hash); |
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503 unsigned int p_hash = placeholders()->compute_hash(name, loader_data); |
0 | 504 int p_index = placeholders()->hash_to_index(p_hash); |
505 | |
506 // superk is not used, resolve_super called for circularity check only | |
507 // This code is reached in two situations. One if this thread | |
508 // is loading the same class twice (e.g. ClassCircularity, or | |
509 // java.lang.instrument). | |
510 // The second is if another thread started the resolve_super first | |
511 // and has not yet finished. | |
512 // In both cases the original caller will clean up the placeholder | |
513 // entry on error. | |
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514 Klass* superk = SystemDictionary::resolve_super_or_fail(name, |
0 | 515 superclassname, |
516 class_loader, | |
517 protection_domain, | |
518 true, | |
519 CHECK_(nh)); | |
520 | |
514 | 521 // parallelCapable class loaders do NOT wait for parallel superclass loads to complete |
522 // Serial class loaders and bootstrap classloader do wait for superclass loads | |
523 if (!class_loader.is_null() && is_parallelCapable(class_loader)) { | |
0 | 524 MutexLocker mu(SystemDictionary_lock, THREAD); |
525 // Check if classloading completed while we were loading superclass or waiting | |
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526 Klass* check = find_class(d_index, d_hash, name, loader_data); |
0 | 527 if (check != NULL) { |
528 // Klass is already loaded, so just return it | |
529 return(instanceKlassHandle(THREAD, check)); | |
530 } else { | |
531 return nh; | |
532 } | |
533 } | |
534 | |
535 // must loop to both handle other placeholder updates | |
536 // and spurious notifications | |
537 bool super_load_in_progress = true; | |
538 PlaceholderEntry* placeholder; | |
539 while (super_load_in_progress) { | |
540 MutexLocker mu(SystemDictionary_lock, THREAD); | |
541 // Check if classloading completed while we were loading superclass or waiting | |
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542 Klass* check = find_class(d_index, d_hash, name, loader_data); |
0 | 543 if (check != NULL) { |
544 // Klass is already loaded, so just return it | |
545 return(instanceKlassHandle(THREAD, check)); | |
546 } else { | |
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547 placeholder = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
0 | 548 if (placeholder && placeholder->super_load_in_progress() ){ |
549 // Before UnsyncloadClass: | |
550 // We only get here if the application has released the | |
551 // classloader lock when another thread was in the middle of loading a | |
552 // superclass/superinterface for this class, and now | |
553 // this thread is also trying to load this class. | |
554 // To minimize surprises, the first thread that started to | |
555 // load a class should be the one to complete the loading | |
556 // with the classfile it initially expected. | |
557 // This logic has the current thread wait once it has done | |
558 // all the superclass/superinterface loading it can, until | |
559 // the original thread completes the class loading or fails | |
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560 // If it completes we will use the resulting InstanceKlass |
0 | 561 // which we will find below in the systemDictionary. |
562 // We also get here for parallel bootstrap classloader | |
563 if (class_loader.is_null()) { | |
564 SystemDictionary_lock->wait(); | |
565 } else { | |
566 double_lock_wait(lockObject, THREAD); | |
567 } | |
568 } else { | |
569 // If not in SD and not in PH, other thread's load must have failed | |
570 super_load_in_progress = false; | |
571 } | |
572 } | |
573 } | |
574 return (nh); | |
575 } | |
576 | |
577 | |
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578 Klass* SystemDictionary::resolve_instance_class_or_null(Symbol* name, Handle class_loader, Handle protection_domain, TRAPS) { |
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579 assert(name != NULL && !FieldType::is_array(name) && |
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580 !FieldType::is_obj(name), "invalid class name"); |
0 | 581 |
582 // UseNewReflection | |
583 // Fix for 4474172; see evaluation for more details | |
584 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); | |
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585 ClassLoaderData *loader_data = register_loader(class_loader, CHECK_NULL); |
0 | 586 |
587 // Do lookup to see if class already exist and the protection domain | |
588 // has the right access | |
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589 // This call uses find which checks protection domain already matches |
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590 // All subsequent calls use find_class, and set has_loaded_class so that |
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591 // before we return a result we call out to java to check for valid protection domain |
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592 // to allow returning the Klass* and add it to the pd_set if it is valid |
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593 unsigned int d_hash = dictionary()->compute_hash(name, loader_data); |
0 | 594 int d_index = dictionary()->hash_to_index(d_hash); |
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595 Klass* probe = dictionary()->find(d_index, d_hash, name, loader_data, |
0 | 596 protection_domain, THREAD); |
597 if (probe != NULL) return probe; | |
598 | |
599 | |
600 // Non-bootstrap class loaders will call out to class loader and | |
601 // define via jvm/jni_DefineClass which will acquire the | |
602 // class loader object lock to protect against multiple threads | |
603 // defining the class in parallel by accident. | |
604 // This lock must be acquired here so the waiter will find | |
605 // any successful result in the SystemDictionary and not attempt | |
606 // the define | |
514 | 607 // ParallelCapable Classloaders and the bootstrap classloader, |
0 | 608 // or all classloaders with UnsyncloadClass do not acquire lock here |
609 bool DoObjectLock = true; | |
514 | 610 if (is_parallelCapable(class_loader)) { |
0 | 611 DoObjectLock = false; |
612 } | |
613 | |
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614 unsigned int p_hash = placeholders()->compute_hash(name, loader_data); |
0 | 615 int p_index = placeholders()->hash_to_index(p_hash); |
616 | |
617 // Class is not in SystemDictionary so we have to do loading. | |
618 // Make sure we are synchronized on the class loader before we proceed | |
619 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
620 check_loader_lock_contention(lockObject, THREAD); | |
621 ObjectLocker ol(lockObject, THREAD, DoObjectLock); | |
622 | |
623 // Check again (after locking) if class already exist in SystemDictionary | |
624 bool class_has_been_loaded = false; | |
625 bool super_load_in_progress = false; | |
626 bool havesupername = false; | |
627 instanceKlassHandle k; | |
628 PlaceholderEntry* placeholder; | |
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629 Symbol* superclassname = NULL; |
0 | 630 |
631 { | |
632 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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633 Klass* check = find_class(d_index, d_hash, name, loader_data); |
0 | 634 if (check != NULL) { |
635 // Klass is already loaded, so just return it | |
636 class_has_been_loaded = true; | |
637 k = instanceKlassHandle(THREAD, check); | |
638 } else { | |
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639 placeholder = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
0 | 640 if (placeholder && placeholder->super_load_in_progress()) { |
641 super_load_in_progress = true; | |
642 if (placeholder->havesupername() == true) { | |
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643 superclassname = placeholder->supername(); |
0 | 644 havesupername = true; |
645 } | |
646 } | |
647 } | |
648 } | |
649 | |
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650 // If the class is in the placeholder table, class loading is in progress |
0 | 651 if (super_load_in_progress && havesupername==true) { |
652 k = SystemDictionary::handle_parallel_super_load(name, superclassname, | |
653 class_loader, protection_domain, lockObject, THREAD); | |
654 if (HAS_PENDING_EXCEPTION) { | |
655 return NULL; | |
656 } | |
657 if (!k.is_null()) { | |
658 class_has_been_loaded = true; | |
659 } | |
660 } | |
661 | |
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662 bool throw_circularity_error = false; |
0 | 663 if (!class_has_been_loaded) { |
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664 bool load_instance_added = false; |
0 | 665 |
666 // add placeholder entry to record loading instance class | |
667 // Five cases: | |
668 // All cases need to prevent modifying bootclasssearchpath | |
669 // in parallel with a classload of same classname | |
514 | 670 // Redefineclasses uses existence of the placeholder for the duration |
671 // of the class load to prevent concurrent redefinition of not completely | |
672 // defined classes. | |
0 | 673 // case 1. traditional classloaders that rely on the classloader object lock |
674 // - no other need for LOAD_INSTANCE | |
675 // case 2. traditional classloaders that break the classloader object lock | |
676 // as a deadlock workaround. Detection of this case requires that | |
677 // this check is done while holding the classloader object lock, | |
678 // and that lock is still held when calling classloader's loadClass. | |
679 // For these classloaders, we ensure that the first requestor | |
680 // completes the load and other requestors wait for completion. | |
681 // case 3. UnsyncloadClass - don't use objectLocker | |
682 // With this flag, we allow parallel classloading of a | |
683 // class/classloader pair | |
684 // case4. Bootstrap classloader - don't own objectLocker | |
685 // This classloader supports parallelism at the classloader level, | |
686 // but only allows a single load of a class/classloader pair. | |
687 // No performance benefit and no deadlock issues. | |
514 | 688 // case 5. parallelCapable user level classloaders - without objectLocker |
689 // Allow parallel classloading of a class/classloader pair | |
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690 |
0 | 691 { |
692 MutexLocker mu(SystemDictionary_lock, THREAD); | |
514 | 693 if (class_loader.is_null() || !is_parallelCapable(class_loader)) { |
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694 PlaceholderEntry* oldprobe = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
0 | 695 if (oldprobe) { |
696 // only need check_seen_thread once, not on each loop | |
697 // 6341374 java/lang/Instrument with -Xcomp | |
698 if (oldprobe->check_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE)) { | |
699 throw_circularity_error = true; | |
700 } else { | |
701 // case 1: traditional: should never see load_in_progress. | |
702 while (!class_has_been_loaded && oldprobe && oldprobe->instance_load_in_progress()) { | |
703 | |
704 // case 4: bootstrap classloader: prevent futile classloading, | |
705 // wait on first requestor | |
706 if (class_loader.is_null()) { | |
707 SystemDictionary_lock->wait(); | |
708 } else { | |
709 // case 2: traditional with broken classloader lock. wait on first | |
710 // requestor. | |
711 double_lock_wait(lockObject, THREAD); | |
712 } | |
713 // Check if classloading completed while we were waiting | |
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714 Klass* check = find_class(d_index, d_hash, name, loader_data); |
0 | 715 if (check != NULL) { |
716 // Klass is already loaded, so just return it | |
717 k = instanceKlassHandle(THREAD, check); | |
718 class_has_been_loaded = true; | |
719 } | |
720 // check if other thread failed to load and cleaned up | |
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721 oldprobe = placeholders()->get_entry(p_index, p_hash, name, loader_data); |
0 | 722 } |
723 } | |
724 } | |
725 } | |
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726 // All cases: add LOAD_INSTANCE holding SystemDictionary_lock |
514 | 727 // case 3: UnsyncloadClass || case 5: parallelCapable: allow competing threads to try |
0 | 728 // LOAD_INSTANCE in parallel |
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729 |
514 | 730 if (!throw_circularity_error && !class_has_been_loaded) { |
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731 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, name, loader_data, PlaceholderTable::LOAD_INSTANCE, NULL, THREAD); |
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732 load_instance_added = true; |
0 | 733 // For class loaders that do not acquire the classloader object lock, |
734 // if they did not catch another thread holding LOAD_INSTANCE, | |
735 // need a check analogous to the acquire ObjectLocker/find_class | |
736 // i.e. now that we hold the LOAD_INSTANCE token on loading this class/CL | |
737 // one final check if the load has already completed | |
514 | 738 // class loaders holding the ObjectLock shouldn't find the class here |
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739 Klass* check = find_class(d_index, d_hash, name, loader_data); |
0 | 740 if (check != NULL) { |
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741 // Klass is already loaded, so return it after checking/adding protection domain |
0 | 742 k = instanceKlassHandle(THREAD, check); |
743 class_has_been_loaded = true; | |
744 } | |
745 } | |
746 } | |
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747 |
0 | 748 // must throw error outside of owning lock |
749 if (throw_circularity_error) { | |
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750 assert(!HAS_PENDING_EXCEPTION && load_instance_added == false,"circularity error cleanup"); |
0 | 751 ResourceMark rm(THREAD); |
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752 THROW_MSG_NULL(vmSymbols::java_lang_ClassCircularityError(), name->as_C_string()); |
0 | 753 } |
754 | |
755 if (!class_has_been_loaded) { | |
756 | |
757 // Do actual loading | |
758 k = load_instance_class(name, class_loader, THREAD); | |
759 | |
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760 // For UnsyncloadClass only |
0 | 761 // If they got a linkageError, check if a parallel class load succeeded. |
762 // If it did, then for bytecode resolution the specification requires | |
763 // that we return the same result we did for the other thread, i.e. the | |
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764 // successfully loaded InstanceKlass |
0 | 765 // Should not get here for classloaders that support parallelism |
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766 // with the new cleaner mechanism, even with AllowParallelDefineClass |
514 | 767 // Bootstrap goes through here to allow for an extra guarantee check |
0 | 768 if (UnsyncloadClass || (class_loader.is_null())) { |
769 if (k.is_null() && HAS_PENDING_EXCEPTION | |
1142 | 770 && PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { |
0 | 771 MutexLocker mu(SystemDictionary_lock, THREAD); |
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772 Klass* check = find_class(d_index, d_hash, name, loader_data); |
0 | 773 if (check != NULL) { |
774 // Klass is already loaded, so just use it | |
775 k = instanceKlassHandle(THREAD, check); | |
776 CLEAR_PENDING_EXCEPTION; | |
777 guarantee((!class_loader.is_null()), "dup definition for bootstrap loader?"); | |
778 } | |
779 } | |
780 } | |
781 | |
782 // If everything was OK (no exceptions, no null return value), and | |
783 // class_loader is NOT the defining loader, do a little more bookkeeping. | |
784 if (!HAS_PENDING_EXCEPTION && !k.is_null() && | |
785 k->class_loader() != class_loader()) { | |
786 | |
787 check_constraints(d_index, d_hash, k, class_loader, false, THREAD); | |
788 | |
789 // Need to check for a PENDING_EXCEPTION again; check_constraints | |
790 // can throw and doesn't use the CHECK macro. | |
791 if (!HAS_PENDING_EXCEPTION) { | |
792 { // Grabbing the Compile_lock prevents systemDictionary updates | |
793 // during compilations. | |
794 MutexLocker mu(Compile_lock, THREAD); | |
795 update_dictionary(d_index, d_hash, p_index, p_hash, | |
796 k, class_loader, THREAD); | |
797 } | |
798 if (JvmtiExport::should_post_class_load()) { | |
799 Thread *thread = THREAD; | |
800 assert(thread->is_Java_thread(), "thread->is_Java_thread()"); | |
801 JvmtiExport::post_class_load((JavaThread *) thread, k()); | |
802 } | |
803 } | |
804 } | |
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805 } // load_instance_class loop |
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806 |
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807 if (load_instance_added == true) { |
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808 // clean up placeholder entries for LOAD_INSTANCE success or error |
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809 // This brackets the SystemDictionary updates for both defining |
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810 // and initiating loaders |
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811 MutexLocker mu(SystemDictionary_lock, THREAD); |
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812 placeholders()->find_and_remove(p_index, p_hash, name, loader_data, PlaceholderTable::LOAD_INSTANCE, THREAD); |
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813 SystemDictionary_lock->notify_all(); |
0 | 814 } |
815 } | |
816 | |
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817 if (HAS_PENDING_EXCEPTION || k.is_null()) { |
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818 return NULL; |
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819 } |
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820 |
0 | 821 #ifdef ASSERT |
822 { | |
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823 ClassLoaderData* loader_data = k->class_loader_data(); |
0 | 824 MutexLocker mu(SystemDictionary_lock, THREAD); |
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825 Klass* kk = find_class(name, loader_data); |
0 | 826 assert(kk == k(), "should be present in dictionary"); |
827 } | |
828 #endif | |
829 | |
830 // return if the protection domain in NULL | |
831 if (protection_domain() == NULL) return k(); | |
832 | |
833 // Check the protection domain has the right access | |
834 { | |
835 MutexLocker mu(SystemDictionary_lock, THREAD); | |
836 // Note that we have an entry, and entries can be deleted only during GC, | |
837 // so we cannot allow GC to occur while we're holding this entry. | |
838 // We're using a No_Safepoint_Verifier to catch any place where we | |
839 // might potentially do a GC at all. | |
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840 // Dictionary::do_unloading() asserts that classes in SD are only |
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841 // unloaded at a safepoint. Anonymous classes are not in SD. |
0 | 842 No_Safepoint_Verifier nosafepoint; |
843 if (dictionary()->is_valid_protection_domain(d_index, d_hash, name, | |
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844 loader_data, |
0 | 845 protection_domain)) { |
846 return k(); | |
847 } | |
848 } | |
849 | |
850 // Verify protection domain. If it fails an exception is thrown | |
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851 validate_protection_domain(k, class_loader, protection_domain, CHECK_NULL); |
0 | 852 |
853 return k(); | |
854 } | |
855 | |
856 | |
857 // This routine does not lock the system dictionary. | |
858 // | |
859 // Since readers don't hold a lock, we must make sure that system | |
860 // dictionary entries are only removed at a safepoint (when only one | |
861 // thread is running), and are added to in a safe way (all links must | |
862 // be updated in an MT-safe manner). | |
863 // | |
864 // Callers should be aware that an entry could be added just after | |
865 // _dictionary->bucket(index) is read here, so the caller will not see | |
866 // the new entry. | |
867 | |
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868 Klass* SystemDictionary::find(Symbol* class_name, |
0 | 869 Handle class_loader, |
870 Handle protection_domain, | |
871 TRAPS) { | |
872 | |
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873 // UseNewReflection |
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874 // The result of this call should be consistent with the result |
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875 // of the call to resolve_instance_class_or_null(). |
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876 // See evaluation 6790209 and 4474172 for more details. |
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877 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); |
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878 ClassLoaderData* loader_data = register_loader(class_loader, CHECK_NULL); |
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879 |
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880 unsigned int d_hash = dictionary()->compute_hash(class_name, loader_data); |
0 | 881 int d_index = dictionary()->hash_to_index(d_hash); |
882 | |
883 { | |
884 // Note that we have an entry, and entries can be deleted only during GC, | |
885 // so we cannot allow GC to occur while we're holding this entry. | |
886 // We're using a No_Safepoint_Verifier to catch any place where we | |
887 // might potentially do a GC at all. | |
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888 // Dictionary::do_unloading() asserts that classes in SD are only |
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889 // unloaded at a safepoint. Anonymous classes are not in SD. |
0 | 890 No_Safepoint_Verifier nosafepoint; |
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891 return dictionary()->find(d_index, d_hash, class_name, loader_data, |
0 | 892 protection_domain, THREAD); |
893 } | |
894 } | |
895 | |
896 | |
897 // Look for a loaded instance or array klass by name. Do not do any loading. | |
898 // return NULL in case of error. | |
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899 Klass* SystemDictionary::find_instance_or_array_klass(Symbol* class_name, |
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900 Handle class_loader, |
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901 Handle protection_domain, |
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902 TRAPS) { |
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903 Klass* k = NULL; |
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904 assert(class_name != NULL, "class name must be non NULL"); |
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905 |
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906 if (FieldType::is_array(class_name)) { |
0 | 907 // The name refers to an array. Parse the name. |
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908 // dimension and object_key in FieldArrayInfo are assigned as a |
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909 // side-effect of this call |
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910 FieldArrayInfo fd; |
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911 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
0 | 912 if (t != T_OBJECT) { |
913 k = Universe::typeArrayKlassObj(t); | |
914 } else { | |
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915 k = SystemDictionary::find(fd.object_key(), class_loader, protection_domain, THREAD); |
0 | 916 } |
917 if (k != NULL) { | |
6983 | 918 k = k->array_klass_or_null(fd.dimension()); |
0 | 919 } |
920 } else { | |
921 k = find(class_name, class_loader, protection_domain, THREAD); | |
922 } | |
923 return k; | |
924 } | |
925 | |
926 // Note: this method is much like resolve_from_stream, but | |
927 // updates no supplemental data structures. | |
928 // TODO consolidate the two methods with a helper routine? | |
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929 Klass* SystemDictionary::parse_stream(Symbol* class_name, |
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930 Handle class_loader, |
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931 Handle protection_domain, |
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932 ClassFileStream* st, |
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933 KlassHandle host_klass, |
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934 GrowableArray<Handle>* cp_patches, |
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935 TRAPS) { |
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936 TempNewSymbol parsed_name = NULL; |
0 | 937 |
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938 ClassLoaderData* loader_data; |
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939 if (host_klass.not_null()) { |
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940 // Create a new CLD for anonymous class, that uses the same class loader |
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941 // as the host_klass |
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942 assert(EnableInvokeDynamic, ""); |
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943 guarantee(host_klass->class_loader() == class_loader(), "should be the same"); |
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944 loader_data = ClassLoaderData::anonymous_class_loader_data(class_loader(), CHECK_NULL); |
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945 loader_data->record_dependency(host_klass(), CHECK_NULL); |
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946 } else { |
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947 loader_data = ClassLoaderData::class_loader_data(class_loader()); |
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948 } |
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949 |
0 | 950 // Parse the stream. Note that we do this even though this klass might |
951 // already be present in the SystemDictionary, otherwise we would not | |
952 // throw potential ClassFormatErrors. | |
953 // | |
954 // Note: "name" is updated. | |
955 | |
956 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
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957 loader_data, |
0 | 958 protection_domain, |
710 | 959 host_klass, |
960 cp_patches, | |
0 | 961 parsed_name, |
973
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962 true, |
0 | 963 THREAD); |
964 | |
965 | |
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966 if (host_klass.not_null() && k.not_null()) { |
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967 assert(EnableInvokeDynamic, ""); |
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968 k->set_host_klass(host_klass()); |
431
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969 // If it's anonymous, initialize it now, since nobody else will. |
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970 |
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971 { |
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972 MutexLocker mu_r(Compile_lock, THREAD); |
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973 |
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974 // Add to class hierarchy, initialize vtables, and do possible |
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975 // deoptimizations. |
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976 add_to_hierarchy(k, CHECK_NULL); // No exception, but can block |
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977 |
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978 // But, do not add to system dictionary. |
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979 } |
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980 |
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981 // Rewrite and patch constant pool here. |
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982 k->link_class(CHECK_NULL); |
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983 if (cp_patches != NULL) { |
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984 k->constants()->patch_resolved_references(cp_patches); |
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985 } |
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986 k->eager_initialize(CHECK_NULL); |
431
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987 |
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988 // notify jvmti |
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989 if (JvmtiExport::should_post_class_load()) { |
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990 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); |
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991 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); |
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992 } |
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993 } |
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994 assert(host_klass.not_null() || cp_patches == NULL, |
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995 "cp_patches only found with host_klass"); |
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996 |
0 | 997 return k(); |
998 } | |
999 | |
1000 // Add a klass to the system from a stream (called by jni_DefineClass and | |
1001 // JVM_DefineClass). | |
1002 // Note: class_name can be NULL. In that case we do not know the name of | |
1003 // the class until we have parsed the stream. | |
1004 | |
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1005 Klass* SystemDictionary::resolve_from_stream(Symbol* class_name, |
6831
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1006 Handle class_loader, |
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1007 Handle protection_domain, |
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1008 ClassFileStream* st, |
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1009 bool verify, |
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1010 TRAPS) { |
0 | 1011 |
514 | 1012 // Classloaders that support parallelism, e.g. bootstrap classloader, |
1013 // or all classloaders with UnsyncloadClass do not acquire lock here | |
1014 bool DoObjectLock = true; | |
1015 if (is_parallelCapable(class_loader)) { | |
1016 DoObjectLock = false; | |
1017 } | |
1018 | |
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1019 ClassLoaderData* loader_data = register_loader(class_loader, CHECK_NULL); |
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1020 |
514 | 1021 // Make sure we are synchronized on the class loader before we proceed |
0 | 1022 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); |
1023 check_loader_lock_contention(lockObject, THREAD); | |
514 | 1024 ObjectLocker ol(lockObject, THREAD, DoObjectLock); |
0 | 1025 |
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1026 TempNewSymbol parsed_name = NULL; |
0 | 1027 |
1028 // Parse the stream. Note that we do this even though this klass might | |
1029 // already be present in the SystemDictionary, otherwise we would not | |
1030 // throw potential ClassFormatErrors. | |
1031 // | |
1032 // Note: "name" is updated. | |
1033 | |
1034 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
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1035 loader_data, |
0 | 1036 protection_domain, |
1037 parsed_name, | |
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1038 verify, |
0 | 1039 THREAD); |
1040 | |
1041 const char* pkg = "java/"; | |
1042 if (!HAS_PENDING_EXCEPTION && | |
1043 !class_loader.is_null() && | |
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1044 parsed_name != NULL && |
0 | 1045 !strncmp((const char*)parsed_name->bytes(), pkg, strlen(pkg))) { |
1046 // It is illegal to define classes in the "java." package from | |
1047 // JVM_DefineClass or jni_DefineClass unless you're the bootclassloader | |
1048 ResourceMark rm(THREAD); | |
1049 char* name = parsed_name->as_C_string(); | |
1050 char* index = strrchr(name, '/'); | |
1051 *index = '\0'; // chop to just the package name | |
1052 while ((index = strchr(name, '/')) != NULL) { | |
1053 *index = '.'; // replace '/' with '.' in package name | |
1054 } | |
1055 const char* fmt = "Prohibited package name: %s"; | |
1056 size_t len = strlen(fmt) + strlen(name); | |
1057 char* message = NEW_RESOURCE_ARRAY(char, len); | |
1058 jio_snprintf(message, len, fmt, name); | |
1059 Exceptions::_throw_msg(THREAD_AND_LOCATION, | |
1060 vmSymbols::java_lang_SecurityException(), message); | |
1061 } | |
1062 | |
1063 if (!HAS_PENDING_EXCEPTION) { | |
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1064 assert(parsed_name != NULL, "Sanity"); |
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1065 assert(class_name == NULL || class_name == parsed_name, "name mismatch"); |
0 | 1066 // Verification prevents us from creating names with dots in them, this |
1067 // asserts that that's the case. | |
1068 assert(is_internal_format(parsed_name), | |
1069 "external class name format used internally"); | |
1070 | |
1071 // Add class just loaded | |
514 | 1072 // If a class loader supports parallel classloading handle parallel define requests |
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1073 // find_or_define_instance_class may return a different InstanceKlass |
514 | 1074 if (is_parallelCapable(class_loader)) { |
1075 k = find_or_define_instance_class(class_name, class_loader, k, THREAD); | |
1076 } else { | |
1077 define_instance_class(k, THREAD); | |
1078 } | |
0 | 1079 } |
1080 | |
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1081 // Make sure we have an entry in the SystemDictionary on success |
0 | 1082 debug_only( { |
1083 if (!HAS_PENDING_EXCEPTION) { | |
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1084 assert(parsed_name != NULL, "parsed_name is still null?"); |
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1085 Symbol* h_name = k->name(); |
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1086 ClassLoaderData *defining_loader_data = k->class_loader_data(); |
0 | 1087 |
1088 MutexLocker mu(SystemDictionary_lock, THREAD); | |
1089 | |
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1090 Klass* check = find_class(parsed_name, loader_data); |
0 | 1091 assert(check == k(), "should be present in the dictionary"); |
1092 | |
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1093 Klass* check2 = find_class(h_name, defining_loader_data); |
0 | 1094 assert(check == check2, "name inconsistancy in SystemDictionary"); |
1095 } | |
1096 } ); | |
1097 | |
1098 return k(); | |
1099 } | |
1100 | |
1101 | |
6197 | 1102 void SystemDictionary::set_shared_dictionary(HashtableBucket<mtClass>* t, int length, |
0 | 1103 int number_of_entries) { |
6197 | 1104 assert(length == _nof_buckets * sizeof(HashtableBucket<mtClass>), |
0 | 1105 "bad shared dictionary size."); |
1106 _shared_dictionary = new Dictionary(_nof_buckets, t, number_of_entries); | |
1107 } | |
1108 | |
1109 | |
1110 // If there is a shared dictionary, then find the entry for the | |
1111 // given shared system class, if any. | |
1112 | |
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1113 Klass* SystemDictionary::find_shared_class(Symbol* class_name) { |
0 | 1114 if (shared_dictionary() != NULL) { |
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1115 unsigned int d_hash = shared_dictionary()->compute_hash(class_name, NULL); |
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1116 int d_index = shared_dictionary()->hash_to_index(d_hash); |
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1117 |
0 | 1118 return shared_dictionary()->find_shared_class(d_index, d_hash, class_name); |
1119 } else { | |
1120 return NULL; | |
1121 } | |
1122 } | |
1123 | |
1124 | |
1125 // Load a class from the shared spaces (found through the shared system | |
1126 // dictionary). Force the superclass and all interfaces to be loaded. | |
1127 // Update the class definition to include sibling classes and no | |
1128 // subclasses (yet). [Classes in the shared space are not part of the | |
1129 // object hierarchy until loaded.] | |
1130 | |
1131 instanceKlassHandle SystemDictionary::load_shared_class( | |
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1132 Symbol* class_name, Handle class_loader, TRAPS) { |
0 | 1133 instanceKlassHandle ik (THREAD, find_shared_class(class_name)); |
1134 return load_shared_class(ik, class_loader, THREAD); | |
1135 } | |
1136 | |
1137 // Note well! Changes to this method may affect oop access order | |
1138 // in the shared archive. Please take care to not make changes that | |
1139 // adversely affect cold start time by changing the oop access order | |
1140 // that is specified in dump.cpp MarkAndMoveOrderedReadOnly and | |
1141 // MarkAndMoveOrderedReadWrite closures. | |
1142 instanceKlassHandle SystemDictionary::load_shared_class( | |
1143 instanceKlassHandle ik, Handle class_loader, TRAPS) { | |
1144 assert(class_loader.is_null(), "non-null classloader for shared class?"); | |
1145 if (ik.not_null()) { | |
1146 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1147 Symbol* class_name = ik->name(); |
0 | 1148 |
1149 // Found the class, now load the superclass and interfaces. If they | |
1150 // are shared, add them to the main system dictionary and reset | |
1151 // their hierarchy references (supers, subs, and interfaces). | |
1152 | |
1153 if (ik->super() != NULL) { | |
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1154 Symbol* cn = ik->super()->name(); |
0 | 1155 resolve_super_or_fail(class_name, cn, |
1156 class_loader, Handle(), true, CHECK_(nh)); | |
1157 } | |
1158 | |
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1159 Array<Klass*>* interfaces = ik->local_interfaces(); |
0 | 1160 int num_interfaces = interfaces->length(); |
1161 for (int index = 0; index < num_interfaces; index++) { | |
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1162 Klass* k = interfaces->at(index); |
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1163 |
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1164 // Note: can not use InstanceKlass::cast here because |
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1165 // interfaces' InstanceKlass's C++ vtbls haven't been |
0 | 1166 // reinitialized yet (they will be once the interface classes |
1167 // are loaded) | |
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1168 Symbol* name = k->name(); |
0 | 1169 resolve_super_or_fail(class_name, name, class_loader, Handle(), false, CHECK_(nh)); |
1170 } | |
1171 | |
1172 // Adjust methods to recover missing data. They need addresses for | |
1173 // interpreter entry points and their default native method address | |
1174 // must be reset. | |
1175 | |
1176 // Updating methods must be done under a lock so multiple | |
1177 // threads don't update these in parallel | |
1178 // Shared classes are all currently loaded by the bootstrap | |
1179 // classloader, so this will never cause a deadlock on | |
1180 // a custom class loader lock. | |
1181 | |
1182 { | |
1183 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
1184 check_loader_lock_contention(lockObject, THREAD); | |
1185 ObjectLocker ol(lockObject, THREAD, true); | |
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1186 ik->restore_unshareable_info(CHECK_(nh)); |
0 | 1187 } |
1188 | |
1189 if (TraceClassLoading) { | |
1190 ResourceMark rm; | |
1191 tty->print("[Loaded %s", ik->external_name()); | |
1192 tty->print(" from shared objects file"); | |
1193 tty->print_cr("]"); | |
1194 } | |
1195 // notify a class loaded from shared object | |
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1196 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(ik()), |
0 | 1197 true /* shared class */); |
1198 } | |
1199 return ik; | |
1200 } | |
1201 | |
1202 #ifdef KERNEL | |
1203 // Some classes on the bootstrap class path haven't been installed on the | |
1204 // system yet. Call the DownloadManager method to make them appear in the | |
1205 // bootstrap class path and try again to load the named class. | |
1206 // Note that with delegation class loaders all classes in another loader will | |
1207 // first try to call this so it'd better be fast!! | |
1208 static instanceKlassHandle download_and_retry_class_load( | |
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1209 Symbol* class_name, |
0 | 1210 TRAPS) { |
1211 | |
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1212 Klass* dlm = SystemDictionary::DownloadManager_klass(); |
0 | 1213 instanceKlassHandle nk; |
1214 | |
1215 // If download manager class isn't loaded just return. | |
1216 if (dlm == NULL) return nk; | |
1217 | |
1218 { HandleMark hm(THREAD); | |
1219 ResourceMark rm(THREAD); | |
1220 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nk)); | |
1221 Handle class_string = java_lang_String::externalize_classname(s, CHECK_(nk)); | |
1222 | |
1223 // return value | |
1224 JavaValue result(T_OBJECT); | |
1225 | |
1226 // Call the DownloadManager. We assume that it has a lock because | |
1227 // multiple classes could be not found and downloaded at the same time. | |
1228 // class sun.misc.DownloadManager; | |
1229 // public static String getBootClassPathEntryForClass(String className); | |
1230 JavaCalls::call_static(&result, | |
1231 KlassHandle(THREAD, dlm), | |
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1232 vmSymbols::getBootClassPathEntryForClass_name(), |
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1233 vmSymbols::string_string_signature(), |
0 | 1234 class_string, |
1235 CHECK_(nk)); | |
1236 | |
1237 // Get result.string and add to bootclasspath | |
1238 assert(result.get_type() == T_OBJECT, "just checking"); | |
1239 oop obj = (oop) result.get_jobject(); | |
1240 if (obj == NULL) { return nk; } | |
1241 | |
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1242 Handle h_obj(THREAD, obj); |
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1243 char* new_class_name = java_lang_String::as_platform_dependent_str(h_obj, |
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1244 CHECK_(nk)); |
0 | 1245 |
1246 // lock the loader | |
1247 // we use this lock because JVMTI does. | |
1248 Handle loader_lock(THREAD, SystemDictionary::system_loader_lock()); | |
1249 | |
1250 ObjectLocker ol(loader_lock, THREAD); | |
1251 // add the file to the bootclasspath | |
1252 ClassLoader::update_class_path_entry_list(new_class_name, true); | |
1253 } // end HandleMark | |
1254 | |
1255 if (TraceClassLoading) { | |
1256 ClassLoader::print_bootclasspath(); | |
1257 } | |
1258 return ClassLoader::load_classfile(class_name, CHECK_(nk)); | |
1259 } | |
1260 #endif // KERNEL | |
1261 | |
1262 | |
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1263 instanceKlassHandle SystemDictionary::load_instance_class(Symbol* class_name, Handle class_loader, TRAPS) { |
0 | 1264 instanceKlassHandle nh = instanceKlassHandle(); // null Handle |
1265 if (class_loader.is_null()) { | |
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1266 |
0 | 1267 // Search the shared system dictionary for classes preloaded into the |
1268 // shared spaces. | |
1269 instanceKlassHandle k; | |
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1270 { |
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1271 PerfTraceTime vmtimer(ClassLoader::perf_shared_classload_time()); |
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1272 k = load_shared_class(class_name, class_loader, THREAD); |
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1273 } |
0 | 1274 |
1275 if (k.is_null()) { | |
1276 // Use VM class loader | |
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1277 PerfTraceTime vmtimer(ClassLoader::perf_sys_classload_time()); |
0 | 1278 k = ClassLoader::load_classfile(class_name, CHECK_(nh)); |
1279 } | |
1280 | |
1281 #ifdef KERNEL | |
1282 // If the VM class loader has failed to load the class, call the | |
1283 // DownloadManager class to make it magically appear on the classpath | |
1284 // and try again. This is only configured with the Kernel VM. | |
1285 if (k.is_null()) { | |
1286 k = download_and_retry_class_load(class_name, CHECK_(nh)); | |
1287 } | |
1288 #endif // KERNEL | |
1289 | |
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1290 // find_or_define_instance_class may return a different InstanceKlass |
0 | 1291 if (!k.is_null()) { |
1292 k = find_or_define_instance_class(class_name, class_loader, k, CHECK_(nh)); | |
1293 } | |
1294 return k; | |
1295 } else { | |
1296 // Use user specified class loader to load class. Call loadClass operation on class_loader. | |
1297 ResourceMark rm(THREAD); | |
1298 | |
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1299 assert(THREAD->is_Java_thread(), "must be a JavaThread"); |
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1300 JavaThread* jt = (JavaThread*) THREAD; |
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1301 |
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1302 PerfClassTraceTime vmtimer(ClassLoader::perf_app_classload_time(), |
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1303 ClassLoader::perf_app_classload_selftime(), |
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1304 ClassLoader::perf_app_classload_count(), |
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1305 jt->get_thread_stat()->perf_recursion_counts_addr(), |
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1306 jt->get_thread_stat()->perf_timers_addr(), |
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1307 PerfClassTraceTime::CLASS_LOAD); |
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1308 |
0 | 1309 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nh)); |
1310 // Translate to external class name format, i.e., convert '/' chars to '.' | |
1311 Handle string = java_lang_String::externalize_classname(s, CHECK_(nh)); | |
1312 | |
1313 JavaValue result(T_OBJECT); | |
1314 | |
1142 | 1315 KlassHandle spec_klass (THREAD, SystemDictionary::ClassLoader_klass()); |
0 | 1316 |
514 | 1317 // Call public unsynchronized loadClass(String) directly for all class loaders |
1318 // for parallelCapable class loaders. JDK >=7, loadClass(String, boolean) will | |
1319 // acquire a class-name based lock rather than the class loader object lock. | |
1320 // JDK < 7 already acquire the class loader lock in loadClass(String, boolean), | |
1321 // so the call to loadClassInternal() was not required. | |
1322 // | |
1323 // UnsyncloadClass flag means both call loadClass(String) and do | |
1324 // not acquire the class loader lock even for class loaders that are | |
1325 // not parallelCapable. This was a risky transitional | |
1326 // flag for diagnostic purposes only. It is risky to call | |
0 | 1327 // custom class loaders without synchronization. |
1328 // WARNING If a custom class loader does NOT synchronizer findClass, or callers of | |
514 | 1329 // findClass, the UnsyncloadClass flag risks unexpected timing bugs in the field. |
0 | 1330 // Do NOT assume this will be supported in future releases. |
514 | 1331 // |
1332 // Added MustCallLoadClassInternal in case we discover in the field | |
1333 // a customer that counts on this call | |
1334 if (MustCallLoadClassInternal && has_loadClassInternal()) { | |
0 | 1335 JavaCalls::call_special(&result, |
1336 class_loader, | |
1337 spec_klass, | |
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1338 vmSymbols::loadClassInternal_name(), |
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1339 vmSymbols::string_class_signature(), |
0 | 1340 string, |
1341 CHECK_(nh)); | |
1342 } else { | |
1343 JavaCalls::call_virtual(&result, | |
1344 class_loader, | |
1345 spec_klass, | |
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1346 vmSymbols::loadClass_name(), |
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1347 vmSymbols::string_class_signature(), |
0 | 1348 string, |
1349 CHECK_(nh)); | |
1350 } | |
1351 | |
1352 assert(result.get_type() == T_OBJECT, "just checking"); | |
1353 oop obj = (oop) result.get_jobject(); | |
1354 | |
1355 // Primitive classes return null since forName() can not be | |
1356 // used to obtain any of the Class objects representing primitives or void | |
1357 if ((obj != NULL) && !(java_lang_Class::is_primitive(obj))) { | |
1358 instanceKlassHandle k = | |
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1359 instanceKlassHandle(THREAD, java_lang_Class::as_Klass(obj)); |
0 | 1360 // For user defined Java class loaders, check that the name returned is |
1361 // the same as that requested. This check is done for the bootstrap | |
1362 // loader when parsing the class file. | |
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1363 if (class_name == k->name()) { |
0 | 1364 return k; |
1365 } | |
1366 } | |
1367 // Class is not found or has the wrong name, return NULL | |
1368 return nh; | |
1369 } | |
1370 } | |
1371 | |
1372 void SystemDictionary::define_instance_class(instanceKlassHandle k, TRAPS) { | |
1373 | |
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1374 ClassLoaderData* loader_data = k->class_loader_data(); |
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1375 Handle class_loader_h(THREAD, loader_data->class_loader()); |
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1376 |
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1377 for (uintx it = 0; it < GCExpandToAllocateDelayMillis; it++){} |
0 | 1378 |
514 | 1379 // for bootstrap and other parallel classloaders don't acquire lock, |
1380 // use placeholder token | |
1381 // If a parallelCapable class loader calls define_instance_class instead of | |
1382 // find_or_define_instance_class to get here, we have a timing | |
1383 // hole with systemDictionary updates and check_constraints | |
1384 if (!class_loader_h.is_null() && !is_parallelCapable(class_loader_h)) { | |
0 | 1385 assert(ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, |
1386 compute_loader_lock_object(class_loader_h, THREAD)), | |
1387 "define called without lock"); | |
1388 } | |
1389 | |
1390 // Check class-loading constraints. Throw exception if violation is detected. | |
1391 // Grabs and releases SystemDictionary_lock | |
1392 // The check_constraints/find_class call and update_dictionary sequence | |
1393 // must be "atomic" for a specific class/classloader pair so we never | |
1394 // define two different instanceKlasses for that class/classloader pair. | |
1395 // Existing classloaders will call define_instance_class with the | |
1396 // classloader lock held | |
1397 // Parallel classloaders will call find_or_define_instance_class | |
1398 // which will require a token to perform the define class | |
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1399 Symbol* name_h = k->name(); |
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1400 unsigned int d_hash = dictionary()->compute_hash(name_h, loader_data); |
0 | 1401 int d_index = dictionary()->hash_to_index(d_hash); |
1402 check_constraints(d_index, d_hash, k, class_loader_h, true, CHECK); | |
1403 | |
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1404 // Register class just loaded with class loader (placed in Vector) |
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1405 // Note we do this before updating the dictionary, as this can |
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1406 // fail with an OutOfMemoryError (if it does, we will *not* put this |
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1407 // class in the dictionary and will not update the class hierarchy). |
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1408 // JVMTI FollowReferences needs to find the classes this way. |
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1409 if (k->class_loader() != NULL) { |
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1410 methodHandle m(THREAD, Universe::loader_addClass_method()); |
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1411 JavaValue result(T_VOID); |
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1412 JavaCallArguments args(class_loader_h); |
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1413 args.push_oop(Handle(THREAD, k->java_mirror())); |
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1414 JavaCalls::call(&result, m, &args, CHECK); |
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1415 } |
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1416 |
0 | 1417 // Add the new class. We need recompile lock during update of CHA. |
1418 { | |
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1419 unsigned int p_hash = placeholders()->compute_hash(name_h, loader_data); |
0 | 1420 int p_index = placeholders()->hash_to_index(p_hash); |
1421 | |
1422 MutexLocker mu_r(Compile_lock, THREAD); | |
1423 | |
1424 // Add to class hierarchy, initialize vtables, and do possible | |
1425 // deoptimizations. | |
1426 add_to_hierarchy(k, CHECK); // No exception, but can block | |
1427 | |
1428 // Add to systemDictionary - so other classes can see it. | |
1429 // Grabs and releases SystemDictionary_lock | |
1430 update_dictionary(d_index, d_hash, p_index, p_hash, | |
1431 k, class_loader_h, THREAD); | |
1432 } | |
1433 k->eager_initialize(THREAD); | |
1434 | |
1435 // notify jvmti | |
1436 if (JvmtiExport::should_post_class_load()) { | |
1437 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); | |
1438 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); | |
1439 | |
1440 } | |
1441 } | |
1442 | |
1443 // Support parallel classloading | |
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1444 // All parallel class loaders, including bootstrap classloader |
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1445 // lock a placeholder entry for this class/class_loader pair |
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1446 // to allow parallel defines of different classes for this class loader |
514 | 1447 // With AllowParallelDefine flag==true, in case they do not synchronize around |
1448 // FindLoadedClass/DefineClass, calls, we check for parallel | |
0 | 1449 // loading for them, wait if a defineClass is in progress |
1450 // and return the initial requestor's results | |
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1451 // This flag does not apply to the bootstrap classloader. |
514 | 1452 // With AllowParallelDefine flag==false, call through to define_instance_class |
1453 // which will throw LinkageError: duplicate class definition. | |
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1454 // False is the requested default. |
0 | 1455 // For better performance, the class loaders should synchronize |
514 | 1456 // findClass(), i.e. FindLoadedClass/DefineClassIfAbsent or they |
0 | 1457 // potentially waste time reading and parsing the bytestream. |
1458 // Note: VM callers should ensure consistency of k/class_name,class_loader | |
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1459 instanceKlassHandle SystemDictionary::find_or_define_instance_class(Symbol* class_name, Handle class_loader, instanceKlassHandle k, TRAPS) { |
0 | 1460 |
1461 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1462 Symbol* name_h = k->name(); // passed in class_name may be null |
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1463 ClassLoaderData* loader_data = class_loader_data(class_loader); |
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1464 |
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1465 unsigned int d_hash = dictionary()->compute_hash(name_h, loader_data); |
0 | 1466 int d_index = dictionary()->hash_to_index(d_hash); |
1467 | |
1468 // Hold SD lock around find_class and placeholder creation for DEFINE_CLASS | |
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1469 unsigned int p_hash = placeholders()->compute_hash(name_h, loader_data); |
0 | 1470 int p_index = placeholders()->hash_to_index(p_hash); |
1471 PlaceholderEntry* probe; | |
1472 | |
1473 { | |
1474 MutexLocker mu(SystemDictionary_lock, THREAD); | |
1475 // First check if class already defined | |
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1476 if (UnsyncloadClass || (is_parallelDefine(class_loader))) { |
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1477 Klass* check = find_class(d_index, d_hash, name_h, loader_data); |
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1478 if (check != NULL) { |
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1479 return(instanceKlassHandle(THREAD, check)); |
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1480 } |
0 | 1481 } |
1482 | |
1483 // Acquire define token for this class/classloader | |
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1484 probe = placeholders()->find_and_add(p_index, p_hash, name_h, loader_data, PlaceholderTable::DEFINE_CLASS, NULL, THREAD); |
514 | 1485 // Wait if another thread defining in parallel |
1486 // All threads wait - even those that will throw duplicate class: otherwise | |
1487 // caller is surprised by LinkageError: duplicate, but findLoadedClass fails | |
1488 // if other thread has not finished updating dictionary | |
1489 while (probe->definer() != NULL) { | |
1490 SystemDictionary_lock->wait(); | |
1491 } | |
1492 // Only special cases allow parallel defines and can use other thread's results | |
1493 // Other cases fall through, and may run into duplicate defines | |
1494 // caught by finding an entry in the SystemDictionary | |
6983 | 1495 if ((UnsyncloadClass || is_parallelDefine(class_loader)) && (probe->instance_klass() != NULL)) { |
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1496 placeholders()->find_and_remove(p_index, p_hash, name_h, loader_data, PlaceholderTable::DEFINE_CLASS, THREAD); |
514 | 1497 SystemDictionary_lock->notify_all(); |
0 | 1498 #ifdef ASSERT |
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1499 Klass* check = find_class(d_index, d_hash, name_h, loader_data); |
514 | 1500 assert(check != NULL, "definer missed recording success"); |
0 | 1501 #endif |
6983 | 1502 return(instanceKlassHandle(THREAD, probe->instance_klass())); |
0 | 1503 } else { |
514 | 1504 // This thread will define the class (even if earlier thread tried and had an error) |
1505 probe->set_definer(THREAD); | |
0 | 1506 } |
1507 } | |
1508 | |
1509 define_instance_class(k, THREAD); | |
1510 | |
1511 Handle linkage_exception = Handle(); // null handle | |
1512 | |
1513 // definer must notify any waiting threads | |
1514 { | |
1515 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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1516 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name_h, loader_data); |
0 | 1517 assert(probe != NULL, "DEFINE_CLASS placeholder lost?"); |
1518 if (probe != NULL) { | |
1519 if (HAS_PENDING_EXCEPTION) { | |
1520 linkage_exception = Handle(THREAD,PENDING_EXCEPTION); | |
1521 CLEAR_PENDING_EXCEPTION; | |
1522 } else { | |
6983 | 1523 probe->set_instance_klass(k()); |
0 | 1524 } |
1525 probe->set_definer(NULL); | |
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1526 placeholders()->find_and_remove(p_index, p_hash, name_h, loader_data, PlaceholderTable::DEFINE_CLASS, THREAD); |
0 | 1527 SystemDictionary_lock->notify_all(); |
1528 } | |
1529 } | |
1530 | |
1531 // Can't throw exception while holding lock due to rank ordering | |
1532 if (linkage_exception() != NULL) { | |
1533 THROW_OOP_(linkage_exception(), nh); // throws exception and returns | |
1534 } | |
1535 | |
1536 return k; | |
1537 } | |
1538 Handle SystemDictionary::compute_loader_lock_object(Handle class_loader, TRAPS) { | |
1539 // If class_loader is NULL we synchronize on _system_loader_lock_obj | |
1540 if (class_loader.is_null()) { | |
1541 return Handle(THREAD, _system_loader_lock_obj); | |
1542 } else { | |
1543 return class_loader; | |
1544 } | |
1545 } | |
1546 | |
1547 // This method is added to check how often we have to wait to grab loader | |
1548 // lock. The results are being recorded in the performance counters defined in | |
1549 // ClassLoader::_sync_systemLoaderLockContentionRate and | |
1550 // ClassLoader::_sync_nonSystemLoaderLockConteionRate. | |
1551 void SystemDictionary::check_loader_lock_contention(Handle loader_lock, TRAPS) { | |
1552 if (!UsePerfData) { | |
1553 return; | |
1554 } | |
1555 | |
1556 assert(!loader_lock.is_null(), "NULL lock object"); | |
1557 | |
1558 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader_lock) | |
1559 == ObjectSynchronizer::owner_other) { | |
1560 // contention will likely happen, so increment the corresponding | |
1561 // contention counter. | |
1562 if (loader_lock() == _system_loader_lock_obj) { | |
1563 ClassLoader::sync_systemLoaderLockContentionRate()->inc(); | |
1564 } else { | |
1565 ClassLoader::sync_nonSystemLoaderLockContentionRate()->inc(); | |
1566 } | |
1567 } | |
1568 } | |
1569 | |
1570 // ---------------------------------------------------------------------------- | |
1571 // Lookup | |
1572 | |
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1573 Klass* SystemDictionary::find_class(int index, unsigned int hash, |
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1574 Symbol* class_name, |
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1575 ClassLoaderData* loader_data) { |
0 | 1576 assert_locked_or_safepoint(SystemDictionary_lock); |
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1577 assert (index == dictionary()->index_for(class_name, loader_data), |
0 | 1578 "incorrect index?"); |
1579 | |
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1580 Klass* k = dictionary()->find_class(index, hash, class_name, loader_data); |
0 | 1581 return k; |
1582 } | |
1583 | |
1584 | |
1585 // Basic find on classes in the midst of being loaded | |
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1586 Symbol* SystemDictionary::find_placeholder(Symbol* class_name, |
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1587 ClassLoaderData* loader_data) { |
0 | 1588 assert_locked_or_safepoint(SystemDictionary_lock); |
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1589 unsigned int p_hash = placeholders()->compute_hash(class_name, loader_data); |
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1590 int p_index = placeholders()->hash_to_index(p_hash); |
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1591 return placeholders()->find_entry(p_index, p_hash, class_name, loader_data); |
0 | 1592 } |
1593 | |
1594 | |
1595 // Used for assertions and verification only | |
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1596 Klass* SystemDictionary::find_class(Symbol* class_name, ClassLoaderData* loader_data) { |
0 | 1597 #ifndef ASSERT |
1598 guarantee(VerifyBeforeGC || | |
1599 VerifyDuringGC || | |
1600 VerifyBeforeExit || | |
1601 VerifyAfterGC, "too expensive"); | |
1602 #endif | |
1603 assert_locked_or_safepoint(SystemDictionary_lock); | |
1604 | |
1605 // First look in the loaded class array | |
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1606 unsigned int d_hash = dictionary()->compute_hash(class_name, loader_data); |
0 | 1607 int d_index = dictionary()->hash_to_index(d_hash); |
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1608 return find_class(d_index, d_hash, class_name, loader_data); |
0 | 1609 } |
1610 | |
1611 | |
1612 // Get the next class in the diictionary. | |
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1613 Klass* SystemDictionary::try_get_next_class() { |
0 | 1614 return dictionary()->try_get_next_class(); |
1615 } | |
1616 | |
1617 | |
1618 // ---------------------------------------------------------------------------- | |
1619 // Update hierachy. This is done before the new klass has been added to the SystemDictionary. The Recompile_lock | |
1620 // is held, to ensure that the compiler is not using the class hierachy, and that deoptimization will kick in | |
1621 // before a new class is used. | |
1622 | |
1623 void SystemDictionary::add_to_hierarchy(instanceKlassHandle k, TRAPS) { | |
1624 assert(k.not_null(), "just checking"); | |
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1625 assert_locked_or_safepoint(Compile_lock); |
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1626 |
0 | 1627 // Link into hierachy. Make sure the vtables are initialized before linking into |
1628 k->append_to_sibling_list(); // add to superklass/sibling list | |
1629 k->process_interfaces(THREAD); // handle all "implements" declarations | |
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1630 k->set_init_state(InstanceKlass::loaded); |
0 | 1631 // Now flush all code that depended on old class hierarchy. |
1632 // Note: must be done *after* linking k into the hierarchy (was bug 12/9/97) | |
1633 // Also, first reinitialize vtable because it may have gotten out of synch | |
1634 // while the new class wasn't connected to the class hierarchy. | |
1635 Universe::flush_dependents_on(k); | |
1636 } | |
1637 | |
1638 | |
1639 // ---------------------------------------------------------------------------- | |
1640 // GC support | |
1641 | |
1642 // Following roots during mark-sweep is separated in two phases. | |
1643 // | |
1644 // The first phase follows preloaded classes and all other system | |
1645 // classes, since these will never get unloaded anyway. | |
1646 // | |
1647 // The second phase removes (unloads) unreachable classes from the | |
1648 // system dictionary and follows the remaining classes' contents. | |
1649 | |
1650 void SystemDictionary::always_strong_oops_do(OopClosure* blk) { | |
1651 blk->do_oop(&_java_system_loader); | |
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1652 blk->do_oop(&_system_loader_lock_obj); |
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1653 |
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1654 dictionary()->always_strong_oops_do(blk); |
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1655 |
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1656 // Visit extra methods |
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1657 invoke_method_table()->oops_do(blk); |
0 | 1658 } |
1659 | |
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1660 void SystemDictionary::always_strong_classes_do(KlassClosure* closure) { |
0 | 1661 // Follow all system classes and temporary placeholders in dictionary |
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1662 dictionary()->always_strong_classes_do(closure); |
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1663 |
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1664 // Placeholders. These represent classes we're actively loading. |
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1665 placeholders()->classes_do(closure); |
0 | 1666 } |
1667 | |
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1668 // Calculate a "good" systemdictionary size based |
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1669 // on predicted or current loaded classes count |
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1670 int SystemDictionary::calculate_systemdictionary_size(int classcount) { |
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1671 int newsize = _old_default_sdsize; |
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1672 if ((classcount > 0) && !DumpSharedSpaces) { |
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1673 int desiredsize = classcount/_average_depth_goal; |
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1674 for (newsize = _primelist[_sdgeneration]; _sdgeneration < _prime_array_size -1; |
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1675 newsize = _primelist[++_sdgeneration]) { |
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1676 if (desiredsize <= newsize) { |
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1677 break; |
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1678 } |
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1679 } |
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1680 } |
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1681 return newsize; |
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1682 } |
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1683 // Assumes classes in the SystemDictionary are only unloaded at a safepoint |
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1684 // Note: anonymous classes are not in the SD. |
0 | 1685 bool SystemDictionary::do_unloading(BoolObjectClosure* is_alive) { |
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1686 // First, mark for unload all ClassLoaderData referencing a dead class loader. |
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1687 bool has_dead_loaders = ClassLoaderDataGraph::do_unloading(is_alive); |
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1688 bool unloading_occurred = false; |
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1689 if (has_dead_loaders) { |
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1690 unloading_occurred = dictionary()->do_unloading(); |
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1691 constraints()->purge_loader_constraints(); |
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1692 resolution_errors()->purge_resolution_errors(); |
0 | 1693 } |
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1694 return unloading_occurred; |
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1695 } |
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1696 |
0 | 1697 void SystemDictionary::oops_do(OopClosure* f) { |
1698 f->do_oop(&_java_system_loader); | |
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1699 f->do_oop(&_system_loader_lock_obj); |
0 | 1700 |
1701 // Adjust dictionary | |
1702 dictionary()->oops_do(f); | |
1703 | |
710 | 1704 // Visit extra methods |
1903 | 1705 invoke_method_table()->oops_do(f); |
0 | 1706 } |
1707 | |
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1708 // Extended Class redefinition support. |
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1709 // If one of these classes is replaced, we need to replace it in these places. |
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1710 // KlassClosure::do_klass should take the address of a class but we can |
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1711 // change that later. |
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1712 void SystemDictionary::preloaded_classes_do(KlassClosure* f) { |
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1713 for (int k = (int)FIRST_WKID; k < (int)WKID_LIMIT; k++) { |
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1714 f->do_klass(_well_known_klasses[k]); |
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1715 } |
0 | 1716 |
1717 { | |
1718 for (int i = 0; i < T_VOID+1; i++) { | |
1719 if (_box_klasses[i] != NULL) { | |
1720 assert(i >= T_BOOLEAN, "checking"); | |
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1721 f->do_klass(_box_klasses[i]); |
0 | 1722 } |
1723 } | |
1724 } | |
1725 | |
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1726 FilteredFieldsMap::classes_do(f); |
0 | 1727 } |
1728 | |
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1729 void SystemDictionary::lazily_loaded_classes_do(KlassClosure* f) { |
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1730 f->do_klass(_abstract_ownable_synchronizer_klass); |
0 | 1731 } |
1732 | |
1733 // Just the classes from defining class loaders | |
1734 // Don't iterate over placeholders | |
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1735 void SystemDictionary::classes_do(void f(Klass*)) { |
0 | 1736 dictionary()->classes_do(f); |
1737 } | |
1738 | |
1739 // Added for initialize_itable_for_klass | |
1740 // Just the classes from defining class loaders | |
1741 // Don't iterate over placeholders | |
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1742 void SystemDictionary::classes_do(void f(Klass*, TRAPS), TRAPS) { |
0 | 1743 dictionary()->classes_do(f, CHECK); |
1744 } | |
1745 | |
1746 // All classes, and their class loaders | |
1747 // Don't iterate over placeholders | |
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1748 void SystemDictionary::classes_do(void f(Klass*, ClassLoaderData*)) { |
0 | 1749 dictionary()->classes_do(f); |
1750 } | |
1751 | |
1752 // All classes, and their class loaders | |
1753 // (added for helpers that use HandleMarks and ResourceMarks) | |
1754 // Don't iterate over placeholders | |
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1755 void SystemDictionary::classes_do(void f(Klass*, ClassLoaderData*, TRAPS), TRAPS) { |
0 | 1756 dictionary()->classes_do(f, CHECK); |
1757 } | |
1758 | |
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1759 void SystemDictionary::placeholders_do(void f(Symbol*)) { |
0 | 1760 placeholders()->entries_do(f); |
1761 } | |
1762 | |
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1763 void SystemDictionary::methods_do(void f(Method*)) { |
0 | 1764 dictionary()->methods_do(f); |
1903 | 1765 invoke_method_table()->methods_do(f); |
0 | 1766 } |
1767 | |
1768 // ---------------------------------------------------------------------------- | |
1769 // Lazily load klasses | |
1770 | |
1771 void SystemDictionary::load_abstract_ownable_synchronizer_klass(TRAPS) { | |
1772 assert(JDK_Version::is_gte_jdk16x_version(), "Must be JDK 1.6 or later"); | |
1773 | |
1774 // if multiple threads calling this function, only one thread will load | |
1775 // the class. The other threads will find the loaded version once the | |
1776 // class is loaded. | |
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1777 Klass* aos = _abstract_ownable_synchronizer_klass; |
0 | 1778 if (aos == NULL) { |
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1779 Klass* k = resolve_or_fail(vmSymbols::java_util_concurrent_locks_AbstractOwnableSynchronizer(), true, CHECK); |
0 | 1780 // Force a fence to prevent any read before the write completes |
1781 OrderAccess::fence(); | |
1782 _abstract_ownable_synchronizer_klass = k; | |
1783 } | |
1784 } | |
1785 | |
1786 // ---------------------------------------------------------------------------- | |
1787 // Initialization | |
1788 | |
1789 void SystemDictionary::initialize(TRAPS) { | |
1790 // Allocate arrays | |
1791 assert(dictionary() == NULL, | |
1792 "SystemDictionary should only be initialized once"); | |
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1793 _sdgeneration = 0; |
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1794 _dictionary = new Dictionary(calculate_systemdictionary_size(PredictedLoadedClassCount)); |
1903 | 1795 _placeholders = new PlaceholderTable(_nof_buckets); |
0 | 1796 _number_of_modifications = 0; |
1903 | 1797 _loader_constraints = new LoaderConstraintTable(_loader_constraint_size); |
1798 _resolution_errors = new ResolutionErrorTable(_resolution_error_size); | |
1799 _invoke_method_table = new SymbolPropertyTable(_invoke_method_size); | |
0 | 1800 |
1801 // Allocate private object used as system class loader lock | |
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1802 _system_loader_lock_obj = oopFactory::new_intArray(0, CHECK); |
0 | 1803 // Initialize basic classes |
1804 initialize_preloaded_classes(CHECK); | |
1805 } | |
1806 | |
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1807 // Compact table of directions on the initialization of klasses: |
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1808 static const short wk_init_info[] = { |
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1809 #define WK_KLASS_INIT_INFO(name, symbol, option) \ |
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1810 ( ((int)vmSymbols::VM_SYMBOL_ENUM_NAME(symbol) \ |
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1811 << SystemDictionary::CEIL_LG_OPTION_LIMIT) \ |
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1812 | (int)SystemDictionary::option ), |
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1813 WK_KLASSES_DO(WK_KLASS_INIT_INFO) |
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1814 #undef WK_KLASS_INIT_INFO |
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1815 0 |
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1816 }; |
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1817 |
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1818 bool SystemDictionary::initialize_wk_klass(WKID id, int init_opt, TRAPS) { |
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1819 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1820 int info = wk_init_info[id - FIRST_WKID]; |
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1821 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1822 Symbol* symbol = vmSymbols::symbol_at((vmSymbols::SID)sid); |
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1823 Klass** klassp = &_well_known_klasses[id]; |
2460 | 1824 bool must_load = (init_opt < SystemDictionary::Opt); |
1825 bool try_load = true; | |
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1826 if (init_opt == SystemDictionary::Opt_Kernel) { |
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1827 #ifndef KERNEL |
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1828 try_load = false; |
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1829 #endif //KERNEL |
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1830 } |
2460 | 1831 if ((*klassp) == NULL && try_load) { |
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1832 if (must_load) { |
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1833 (*klassp) = resolve_or_fail(symbol, true, CHECK_0); // load required class |
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1834 } else { |
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1835 (*klassp) = resolve_or_null(symbol, CHECK_0); // load optional klass |
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1836 } |
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1837 } |
2460 | 1838 return ((*klassp) != NULL); |
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1839 } |
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1840 |
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1841 void SystemDictionary::initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS) { |
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1842 assert((int)start_id <= (int)limit_id, "IDs are out of order!"); |
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1843 for (int id = (int)start_id; id < (int)limit_id; id++) { |
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1844 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1845 int info = wk_init_info[id - FIRST_WKID]; |
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1846 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1847 int opt = (info & right_n_bits(CEIL_LG_OPTION_LIMIT)); |
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1848 |
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1849 initialize_wk_klass((WKID)id, opt, CHECK); |
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1850 } |
710 | 1851 |
1852 // move the starting value forward to the limit: | |
1853 start_id = limit_id; | |
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1854 } |
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1855 |
0 | 1856 void SystemDictionary::initialize_preloaded_classes(TRAPS) { |
1142 | 1857 assert(WK_KLASS(Object_klass) == NULL, "preloaded classes should only be initialized once"); |
0 | 1858 // Preload commonly used klasses |
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1859 WKID scan = FIRST_WKID; |
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1860 // first do Object, then String, Class |
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1861 if (UseSharedSpaces) { |
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1862 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Object_klass), scan, CHECK); |
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1863 // Initialize the constant pool for the Object_class |
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1864 InstanceKlass* ik = InstanceKlass::cast(Object_klass()); |
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1865 ik->constants()->restore_unshareable_info(CHECK); |
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1866 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Class_klass), scan, CHECK); |
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1867 } else { |
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1868 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Class_klass), scan, CHECK); |
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1869 } |
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1870 |
6057 | 1871 // Calculate offsets for String and Class classes since they are loaded and |
1872 // can be used after this point. | |
1873 java_lang_String::compute_offsets(); | |
3938 | 1874 java_lang_Class::compute_offsets(); |
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1875 |
0 | 1876 // Fixup mirrors for classes loaded before java.lang.Class. |
1877 // These calls iterate over the objects currently in the perm gen | |
1878 // so calling them at this point is matters (not before when there | |
1879 // are fewer objects and not later after there are more objects | |
1880 // in the perm gen. | |
1881 Universe::initialize_basic_type_mirrors(CHECK); | |
1882 Universe::fixup_mirrors(CHECK); | |
1883 | |
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1884 // do a bunch more: |
1142 | 1885 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Reference_klass), scan, CHECK); |
0 | 1886 |
1887 // Preload ref klasses and set reference types | |
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1888 InstanceKlass::cast(WK_KLASS(Reference_klass))->set_reference_type(REF_OTHER); |
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1889 InstanceRefKlass::update_nonstatic_oop_maps(WK_KLASS(Reference_klass)); |
0 | 1890 |
1142 | 1891 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(PhantomReference_klass), scan, CHECK); |
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1892 InstanceKlass::cast(WK_KLASS(SoftReference_klass))->set_reference_type(REF_SOFT); |
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1893 InstanceKlass::cast(WK_KLASS(WeakReference_klass))->set_reference_type(REF_WEAK); |
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1894 InstanceKlass::cast(WK_KLASS(FinalReference_klass))->set_reference_type(REF_FINAL); |
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1895 InstanceKlass::cast(WK_KLASS(PhantomReference_klass))->set_reference_type(REF_PHANTOM); |
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1896 |
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1897 // JSR 292 classes |
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1898 WKID jsr292_group_start = WK_KLASS_ENUM_NAME(MethodHandle_klass); |
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1899 WKID jsr292_group_end = WK_KLASS_ENUM_NAME(VolatileCallSite_klass); |
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1900 initialize_wk_klasses_until(jsr292_group_start, scan, CHECK); |
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1901 if (EnableInvokeDynamic) { |
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1902 initialize_wk_klasses_through(jsr292_group_end, scan, CHECK); |
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1903 } else { |
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1904 // Skip the JSR 292 classes, if not enabled. |
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1905 scan = WKID(jsr292_group_end + 1); |
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1906 } |
710 | 1907 |
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1908 initialize_wk_klasses_until(WKID_LIMIT, scan, CHECK); |
0 | 1909 |
1142 | 1910 _box_klasses[T_BOOLEAN] = WK_KLASS(Boolean_klass); |
1911 _box_klasses[T_CHAR] = WK_KLASS(Character_klass); | |
1912 _box_klasses[T_FLOAT] = WK_KLASS(Float_klass); | |
1913 _box_klasses[T_DOUBLE] = WK_KLASS(Double_klass); | |
1914 _box_klasses[T_BYTE] = WK_KLASS(Byte_klass); | |
1915 _box_klasses[T_SHORT] = WK_KLASS(Short_klass); | |
1916 _box_klasses[T_INT] = WK_KLASS(Integer_klass); | |
1917 _box_klasses[T_LONG] = WK_KLASS(Long_klass); | |
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1918 //_box_klasses[T_OBJECT] = WK_KLASS(object_klass); |
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1919 //_box_klasses[T_ARRAY] = WK_KLASS(object_klass); |
0 | 1920 |
1921 #ifdef KERNEL | |
3938 | 1922 if (DownloadManager_klass() == NULL) { |
0 | 1923 warning("Cannot find sun/jkernel/DownloadManager"); |
1924 } | |
1925 #endif // KERNEL | |
514 | 1926 |
0 | 1927 { // Compute whether we should use loadClass or loadClassInternal when loading classes. |
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1928 Method* method = InstanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::loadClassInternal_name(), vmSymbols::string_class_signature()); |
0 | 1929 _has_loadClassInternal = (method != NULL); |
1930 } | |
1931 { // Compute whether we should use checkPackageAccess or NOT | |
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1932 Method* method = InstanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::checkPackageAccess_name(), vmSymbols::class_protectiondomain_signature()); |
0 | 1933 _has_checkPackageAccess = (method != NULL); |
1934 } | |
1935 } | |
1936 | |
1937 // Tells if a given klass is a box (wrapper class, such as java.lang.Integer). | |
1938 // If so, returns the basic type it holds. If not, returns T_OBJECT. | |
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1939 BasicType SystemDictionary::box_klass_type(Klass* k) { |
0 | 1940 assert(k != NULL, ""); |
1941 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { | |
1942 if (_box_klasses[i] == k) | |
1943 return (BasicType)i; | |
1944 } | |
1945 return T_OBJECT; | |
1946 } | |
1947 | |
1948 // Constraints on class loaders. The details of the algorithm can be | |
1949 // found in the OOPSLA'98 paper "Dynamic Class Loading in the Java | |
1950 // Virtual Machine" by Sheng Liang and Gilad Bracha. The basic idea is | |
1951 // that the system dictionary needs to maintain a set of contraints that | |
1952 // must be satisfied by all classes in the dictionary. | |
1953 // if defining is true, then LinkageError if already in systemDictionary | |
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1954 // if initiating loader, then ok if InstanceKlass matches existing entry |
0 | 1955 |
1956 void SystemDictionary::check_constraints(int d_index, unsigned int d_hash, | |
1957 instanceKlassHandle k, | |
1958 Handle class_loader, bool defining, | |
1959 TRAPS) { | |
1960 const char *linkage_error = NULL; | |
1961 { | |
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1962 Symbol* name = k->name(); |
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1963 ClassLoaderData *loader_data = class_loader_data(class_loader); |
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1964 |
0 | 1965 MutexLocker mu(SystemDictionary_lock, THREAD); |
1966 | |
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1967 Klass* check = find_class(d_index, d_hash, name, loader_data); |
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1968 if (check != (Klass*)NULL) { |
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1969 // if different InstanceKlass - duplicate class definition, |
0 | 1970 // else - ok, class loaded by a different thread in parallel, |
1971 // we should only have found it if it was done loading and ok to use | |
1972 // system dictionary only holds instance classes, placeholders | |
1973 // also holds array classes | |
1974 | |
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1975 assert(check->oop_is_instance(), "noninstance in systemdictionary"); |
0 | 1976 if ((defining == true) || (k() != check)) { |
1977 linkage_error = "loader (instance of %s): attempted duplicate class " | |
1978 "definition for name: \"%s\""; | |
1979 } else { | |
1980 return; | |
1981 } | |
1982 } | |
1983 | |
1984 #ifdef ASSERT | |
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1985 Symbol* ph_check = find_placeholder(name, loader_data); |
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1986 assert(ph_check == NULL || ph_check == name, "invalid symbol"); |
0 | 1987 #endif |
1988 | |
1989 if (linkage_error == NULL) { | |
1990 if (constraints()->check_or_update(k, class_loader, name) == false) { | |
1991 linkage_error = "loader constraint violation: loader (instance of %s)" | |
1992 " previously initiated loading for a different type with name \"%s\""; | |
1993 } | |
1994 } | |
1995 } | |
1996 | |
1997 // Throw error now if needed (cannot throw while holding | |
1998 // SystemDictionary_lock because of rank ordering) | |
1999 | |
2000 if (linkage_error) { | |
2001 ResourceMark rm(THREAD); | |
2002 const char* class_loader_name = loader_name(class_loader()); | |
2003 char* type_name = k->name()->as_C_string(); | |
2004 size_t buflen = strlen(linkage_error) + strlen(class_loader_name) + | |
2005 strlen(type_name); | |
2006 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
2007 jio_snprintf(buf, buflen, linkage_error, class_loader_name, type_name); | |
2008 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); | |
2009 } | |
2010 } | |
2011 | |
2012 | |
2013 // Update system dictionary - done after check_constraint and add_to_hierachy | |
2014 // have been called. | |
2015 void SystemDictionary::update_dictionary(int d_index, unsigned int d_hash, | |
2016 int p_index, unsigned int p_hash, | |
2017 instanceKlassHandle k, | |
2018 Handle class_loader, | |
2019 TRAPS) { | |
2020 // Compile_lock prevents systemDictionary updates during compilations | |
2021 assert_locked_or_safepoint(Compile_lock); | |
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2022 Symbol* name = k->name(); |
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2023 ClassLoaderData *loader_data = class_loader_data(class_loader); |
0 | 2024 |
2025 { | |
2026 MutexLocker mu1(SystemDictionary_lock, THREAD); | |
2027 | |
2028 // See whether biased locking is enabled and if so set it for this | |
2029 // klass. | |
2030 // Note that this must be done past the last potential blocking | |
2031 // point / safepoint. We enable biased locking lazily using a | |
2032 // VM_Operation to iterate the SystemDictionary and installing the | |
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2033 // biasable mark word into each InstanceKlass's prototype header. |
0 | 2034 // To avoid race conditions where we accidentally miss enabling the |
2035 // optimization for one class in the process of being added to the | |
2036 // dictionary, we must not safepoint after the test of | |
2037 // BiasedLocking::enabled(). | |
2038 if (UseBiasedLocking && BiasedLocking::enabled()) { | |
2039 // Set biased locking bit for all loaded classes; it will be | |
2040 // cleared if revocation occurs too often for this type | |
2041 // NOTE that we must only do this when the class is initally | |
2042 // defined, not each time it is referenced from a new class loader | |
2043 if (k->class_loader() == class_loader()) { | |
2044 k->set_prototype_header(markOopDesc::biased_locking_prototype()); | |
2045 } | |
2046 } | |
2047 | |
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2048 // Assign a classid if one has not already been assigned. The |
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2049 // counter does not need to be atomically incremented since this |
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2050 // is only done while holding the SystemDictionary_lock. |
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2051 // All loaded classes get a unique ID. |
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2052 TRACE_INIT_ID(k); |
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2053 |
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2054 // Make a new system dictionary entry. |
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2055 Klass* sd_check = find_class(d_index, d_hash, name, loader_data); |
0 | 2056 if (sd_check == NULL) { |
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2057 dictionary()->add_klass(name, loader_data, k); |
0 | 2058 notice_modification(); |
2059 } | |
2060 #ifdef ASSERT | |
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2061 sd_check = find_class(d_index, d_hash, name, loader_data); |
0 | 2062 assert (sd_check != NULL, "should have entry in system dictionary"); |
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2063 // Note: there may be a placeholder entry: for circularity testing |
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2064 // or for parallel defines |
0 | 2065 #endif |
2066 SystemDictionary_lock->notify_all(); | |
2067 } | |
2068 } | |
2069 | |
2070 | |
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2071 // Try to find a class name using the loader constraints. The |
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2072 // loader constraints might know about a class that isn't fully loaded |
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2073 // yet and these will be ignored. |
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2074 Klass* SystemDictionary::find_constrained_instance_or_array_klass( |
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2075 Symbol* class_name, Handle class_loader, TRAPS) { |
0 | 2076 |
2077 // First see if it has been loaded directly. | |
2078 // Force the protection domain to be null. (This removes protection checks.) | |
2079 Handle no_protection_domain; | |
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2080 Klass* klass = find_instance_or_array_klass(class_name, class_loader, |
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2081 no_protection_domain, CHECK_NULL); |
0 | 2082 if (klass != NULL) |
2083 return klass; | |
2084 | |
2085 // Now look to see if it has been loaded elsewhere, and is subject to | |
2086 // a loader constraint that would require this loader to return the | |
2087 // klass that is already loaded. | |
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2088 if (FieldType::is_array(class_name)) { |
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2089 // For array classes, their Klass*s are not kept in the |
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2090 // constraint table. The element Klass*s are. |
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2091 FieldArrayInfo fd; |
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2092 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
0 | 2093 if (t != T_OBJECT) { |
2094 klass = Universe::typeArrayKlassObj(t); | |
2095 } else { | |
2096 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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2097 klass = constraints()->find_constrained_klass(fd.object_key(), class_loader); |
0 | 2098 } |
1336 | 2099 // If element class already loaded, allocate array klass |
0 | 2100 if (klass != NULL) { |
6983 | 2101 klass = klass->array_klass_or_null(fd.dimension()); |
0 | 2102 } |
2103 } else { | |
2104 MutexLocker mu(SystemDictionary_lock, THREAD); | |
2105 // Non-array classes are easy: simply check the constraint table. | |
2106 klass = constraints()->find_constrained_klass(class_name, class_loader); | |
2107 } | |
2108 | |
2109 return klass; | |
2110 } | |
2111 | |
2112 | |
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2113 bool SystemDictionary::add_loader_constraint(Symbol* class_name, |
0 | 2114 Handle class_loader1, |
2115 Handle class_loader2, | |
2116 Thread* THREAD) { | |
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2117 ClassLoaderData* loader_data1 = class_loader_data(class_loader1); |
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2118 ClassLoaderData* loader_data2 = class_loader_data(class_loader2); |
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2119 |
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2120 Symbol* constraint_name = NULL; |
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2121 if (!FieldType::is_array(class_name)) { |
1336 | 2122 constraint_name = class_name; |
2123 } else { | |
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2124 // For array classes, their Klass*s are not kept in the |
1336 | 2125 // constraint table. The element classes are. |
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2126 FieldArrayInfo fd; |
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2127 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(false)); |
1336 | 2128 // primitive types always pass |
2129 if (t != T_OBJECT) { | |
2130 return true; | |
2131 } else { | |
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2132 constraint_name = fd.object_key(); |
1336 | 2133 } |
2134 } | |
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2135 unsigned int d_hash1 = dictionary()->compute_hash(constraint_name, loader_data1); |
0 | 2136 int d_index1 = dictionary()->hash_to_index(d_hash1); |
2137 | |
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2138 unsigned int d_hash2 = dictionary()->compute_hash(constraint_name, loader_data2); |
0 | 2139 int d_index2 = dictionary()->hash_to_index(d_hash2); |
2140 { | |
1336 | 2141 MutexLocker mu_s(SystemDictionary_lock, THREAD); |
0 | 2142 |
1336 | 2143 // Better never do a GC while we're holding these oops |
2144 No_Safepoint_Verifier nosafepoint; | |
0 | 2145 |
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2146 Klass* klass1 = find_class(d_index1, d_hash1, constraint_name, loader_data1); |
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2147 Klass* klass2 = find_class(d_index2, d_hash2, constraint_name, loader_data2); |
1336 | 2148 return constraints()->add_entry(constraint_name, klass1, class_loader1, |
2149 klass2, class_loader2); | |
0 | 2150 } |
2151 } | |
2152 | |
2153 // Add entry to resolution error table to record the error when the first | |
2154 // attempt to resolve a reference to a class has failed. | |
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2155 void SystemDictionary::add_resolution_error(constantPoolHandle pool, int which, Symbol* error) { |
0 | 2156 unsigned int hash = resolution_errors()->compute_hash(pool, which); |
2157 int index = resolution_errors()->hash_to_index(hash); | |
2158 { | |
2159 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
2160 resolution_errors()->add_entry(index, hash, pool, which, error); | |
2161 } | |
2162 } | |
2163 | |
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2164 // Delete a resolution error for RedefineClasses for a constant pool is going away |
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2165 void SystemDictionary::delete_resolution_error(ConstantPool* pool) { |
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2166 resolution_errors()->delete_entry(pool); |
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2167 } |
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2168 |
0 | 2169 // Lookup resolution error table. Returns error if found, otherwise NULL. |
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2170 Symbol* SystemDictionary::find_resolution_error(constantPoolHandle pool, int which) { |
0 | 2171 unsigned int hash = resolution_errors()->compute_hash(pool, which); |
2172 int index = resolution_errors()->hash_to_index(hash); | |
2173 { | |
2174 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
2175 ResolutionErrorEntry* entry = resolution_errors()->find_entry(index, hash, pool, which); | |
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2176 return (entry != NULL) ? entry->error() : (Symbol*)NULL; |
0 | 2177 } |
2178 } | |
2179 | |
2180 | |
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2181 // Signature constraints ensure that callers and callees agree about |
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2182 // the meaning of type names in their signatures. This routine is the |
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2183 // intake for constraints. It collects them from several places: |
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2184 // |
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2185 // * LinkResolver::resolve_method (if check_access is true) requires |
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2186 // that the resolving class (the caller) and the defining class of |
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2187 // the resolved method (the callee) agree on each type in the |
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2188 // method's signature. |
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2189 // |
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2190 // * LinkResolver::resolve_interface_method performs exactly the same |
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2191 // checks. |
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2192 // |
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2193 // * LinkResolver::resolve_field requires that the constant pool |
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2194 // attempting to link to a field agree with the field's defining |
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2195 // class about the type of the field signature. |
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2196 // |
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2197 // * klassVtable::initialize_vtable requires that, when a class |
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2198 // overrides a vtable entry allocated by a superclass, that the |
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2199 // overriding method (i.e., the callee) agree with the superclass |
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2200 // on each type in the method's signature. |
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2201 // |
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2202 // * klassItable::initialize_itable requires that, when a class fills |
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2203 // in its itables, for each non-abstract method installed in an |
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2204 // itable, the method (i.e., the callee) agree with the interface |
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2205 // on each type in the method's signature. |
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2206 // |
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2207 // All those methods have a boolean (check_access, checkconstraints) |
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2208 // which turns off the checks. This is used from specialized contexts |
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2209 // such as bootstrapping, dumping, and debugging. |
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2210 // |
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2211 // No direct constraint is placed between the class and its |
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2212 // supertypes. Constraints are only placed along linked relations |
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2213 // between callers and callees. When a method overrides or implements |
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2214 // an abstract method in a supertype (superclass or interface), the |
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2215 // constraints are placed as if the supertype were the caller to the |
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2216 // overriding method. (This works well, since callers to the |
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2217 // supertype have already established agreement between themselves and |
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2218 // the supertype.) As a result of all this, a class can disagree with |
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2219 // its supertype about the meaning of a type name, as long as that |
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2220 // class neither calls a relevant method of the supertype, nor is |
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2221 // called (perhaps via an override) from the supertype. |
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2222 // |
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2223 // |
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2224 // SystemDictionary::check_signature_loaders(sig, l1, l2) |
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2225 // |
0 | 2226 // Make sure all class components (including arrays) in the given |
2227 // signature will be resolved to the same class in both loaders. | |
2228 // Returns the name of the type that failed a loader constraint check, or | |
2229 // NULL if no constraint failed. The returned C string needs cleaning up | |
665
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2230 // with a ResourceMark in the caller. No exception except OOME is thrown. |
1336 | 2231 // Arrays are not added to the loader constraint table, their elements are. |
2177
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2232 char* SystemDictionary::check_signature_loaders(Symbol* signature, |
0 | 2233 Handle loader1, Handle loader2, |
2234 bool is_method, TRAPS) { | |
2235 // Nothing to do if loaders are the same. | |
2236 if (loader1() == loader2()) { | |
2237 return NULL; | |
2238 } | |
2239 | |
2177
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2240 ResourceMark rm(THREAD); |
0 | 2241 SignatureStream sig_strm(signature, is_method); |
2242 while (!sig_strm.is_done()) { | |
2243 if (sig_strm.is_object()) { | |
2177
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2244 Symbol* s = sig_strm.as_symbol(CHECK_NULL); |
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2245 Symbol* sig = s; |
0 | 2246 if (!add_loader_constraint(sig, loader1, loader2, THREAD)) { |
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2247 return sig->as_C_string(); |
0 | 2248 } |
2249 } | |
2250 sig_strm.next(); | |
2251 } | |
2252 return NULL; | |
2253 } | |
2254 | |
2255 | |
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2256 methodHandle SystemDictionary::find_method_handle_intrinsic(vmIntrinsics::ID iid, |
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2257 Symbol* signature, |
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2258 TRAPS) { |
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2259 methodHandle empty; |
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2260 assert(EnableInvokeDynamic, ""); |
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2261 assert(MethodHandles::is_signature_polymorphic(iid) && |
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2262 MethodHandles::is_signature_polymorphic_intrinsic(iid) && |
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2263 iid != vmIntrinsics::_invokeGeneric, |
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2264 err_msg("must be a known MH intrinsic iid=%d: %s", iid, vmIntrinsics::name_at(iid))); |
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2265 |
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2266 unsigned int hash = invoke_method_table()->compute_hash(signature, iid); |
710 | 2267 int index = invoke_method_table()->hash_to_index(hash); |
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2268 SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, iid); |
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2269 methodHandle m; |
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2270 if (spe == NULL || spe->method() == NULL) { |
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2271 spe = NULL; |
710 | 2272 // Must create lots of stuff here, but outside of the SystemDictionary lock. |
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2273 m = Method::make_method_handle_intrinsic(iid, signature, CHECK_(empty)); |
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2274 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_highest_tier, |
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2275 methodHandle(), CompileThreshold, "MH", CHECK_(empty)); |
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2276 |
710 | 2277 // Now grab the lock. We might have to throw away the new method, |
2278 // if a racing thread has managed to install one at the same time. | |
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2279 { |
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2280 MutexLocker ml(SystemDictionary_lock, THREAD); |
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2281 spe = invoke_method_table()->find_entry(index, hash, signature, iid); |
710 | 2282 if (spe == NULL) |
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2283 spe = invoke_method_table()->add_entry(index, hash, signature, iid); |
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2284 if (spe->method() == NULL) |
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2285 spe->set_method(m()); |
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2286 } |
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2287 } |
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2288 |
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2289 assert(spe != NULL && spe->method() != NULL, ""); |
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2290 return spe->method(); |
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2291 } |
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2292 |
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2293 // Helper for unpacking the return value from linkMethod and linkCallSite. |
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2294 static methodHandle unpack_method_and_appendix(Handle mname, |
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2295 KlassHandle accessing_klass, |
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2296 objArrayHandle appendix_box, |
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2297 Handle* appendix_result, |
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2298 TRAPS) { |
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|
2299 methodHandle empty; |
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2300 if (mname.not_null()) { |
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2301 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); |
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2302 if (vmtarget != NULL && vmtarget->is_method()) { |
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2303 Method* m = (Method*)vmtarget; |
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2304 oop appendix = appendix_box->obj_at(0); |
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2305 if (TraceMethodHandles) { |
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|
2306 #ifndef PRODUCT |
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2307 tty->print("Linked method="INTPTR_FORMAT": ", m); |
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|
2308 m->print(); |
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|
2309 if (appendix != NULL) { tty->print("appendix = "); appendix->print(); } |
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|
2310 tty->cr(); |
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2311 #endif //PRODUCT |
3363
167b70ff3abc
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diff
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|
2312 } |
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2313 (*appendix_result) = Handle(THREAD, appendix); |
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2314 // the target is stored in the cpCache and if a reference to this |
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2315 // MethodName is dropped we need a way to make sure the |
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2316 // class_loader containing this method is kept alive. |
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2317 // FIXME: the appendix might also preserve this dependency. |
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2318 ClassLoaderData* this_key = InstanceKlass::cast(accessing_klass())->class_loader_data(); |
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2319 this_key->record_dependency(m->method_holder(), CHECK_NULL); // Can throw OOM |
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2320 return methodHandle(THREAD, m); |
710 | 2321 } |
2322 } | |
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2323 THROW_MSG_(vmSymbols::java_lang_LinkageError(), "bad value from MethodHandleNatives", empty); |
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2324 return empty; |
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2325 } |
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|
2326 |
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2327 methodHandle SystemDictionary::find_method_handle_invoker(Symbol* name, |
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2328 Symbol* signature, |
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2329 KlassHandle accessing_klass, |
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2330 Handle *appendix_result, |
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2331 Handle *method_type_result, |
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2332 TRAPS) { |
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2333 methodHandle empty; |
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|
2334 assert(EnableInvokeDynamic, ""); |
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2335 assert(!THREAD->is_Compiler_thread(), ""); |
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2336 Handle method_type = |
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2337 SystemDictionary::find_method_handle_type(signature, accessing_klass, CHECK_(empty)); |
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2338 if (false) { // FIXME: Decide if the Java upcall should resolve signatures. |
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2339 method_type = java_lang_String::create_from_symbol(signature, CHECK_(empty)); |
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2340 } |
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2341 |
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2342 KlassHandle mh_klass = SystemDictionary::MethodHandle_klass(); |
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2343 int ref_kind = JVM_REF_invokeVirtual; |
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2344 Handle name_str = StringTable::intern(name, CHECK_(empty)); |
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2345 objArrayHandle appendix_box = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1, CHECK_(empty)); |
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2346 assert(appendix_box->obj_at(0) == NULL, ""); |
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2347 |
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2348 // call java.lang.invoke.MethodHandleNatives::linkMethod(... String, MethodType) -> MemberName |
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2349 JavaCallArguments args; |
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2350 args.push_oop(accessing_klass()->java_mirror()); |
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2351 args.push_int(ref_kind); |
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2352 args.push_oop(mh_klass()->java_mirror()); |
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2353 args.push_oop(name_str()); |
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2354 args.push_oop(method_type()); |
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2355 args.push_oop(appendix_box()); |
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2356 JavaValue result(T_OBJECT); |
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2357 JavaCalls::call_static(&result, |
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2358 SystemDictionary::MethodHandleNatives_klass(), |
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2359 vmSymbols::linkMethod_name(), |
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2360 vmSymbols::linkMethod_signature(), |
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2361 &args, CHECK_(empty)); |
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2362 Handle mname(THREAD, (oop) result.get_jobject()); |
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2363 (*method_type_result) = method_type; |
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2364 return unpack_method_and_appendix(mname, accessing_klass, appendix_box, appendix_result, THREAD); |
710 | 2365 } |
2366 | |
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2367 |
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2368 // Ask Java code to find or construct a java.lang.invoke.MethodType for the given |
710 | 2369 // signature, as interpreted relative to the given class loader. |
2370 // Because of class loader constraints, all method handle usage must be | |
2371 // consistent with this loader. | |
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2372 Handle SystemDictionary::find_method_handle_type(Symbol* signature, |
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2373 KlassHandle accessing_klass, |
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2374 TRAPS) { |
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2375 Handle empty; |
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2376 vmIntrinsics::ID null_iid = vmIntrinsics::_none; // distinct from all method handle invoker intrinsics |
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2377 unsigned int hash = invoke_method_table()->compute_hash(signature, null_iid); |
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2378 int index = invoke_method_table()->hash_to_index(hash); |
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2379 SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, null_iid); |
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2380 if (spe != NULL && spe->method_type() != NULL) { |
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2381 assert(java_lang_invoke_MethodType::is_instance(spe->method_type()), ""); |
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2382 return Handle(THREAD, spe->method_type()); |
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2383 } else if (THREAD->is_Compiler_thread()) { |
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2384 warning("SystemDictionary::find_method_handle_type called from compiler thread"); // FIXME |
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2385 return Handle(); // do not attempt from within compiler, unless it was cached |
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2386 } |
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2387 |
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2388 Handle class_loader, protection_domain; |
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2389 bool is_on_bcp = true; // keep this true as long as we can materialize from the boot classloader |
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2390 int npts = ArgumentCount(signature).size(); |
1142 | 2391 objArrayHandle pts = oopFactory::new_objArray(SystemDictionary::Class_klass(), npts, CHECK_(empty)); |
710 | 2392 int arg = 0; |
2393 Handle rt; // the return type from the signature | |
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2394 ResourceMark rm(THREAD); |
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2395 for (SignatureStream ss(signature); !ss.is_done(); ss.next()) { |
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2396 oop mirror = NULL; |
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2397 if (is_on_bcp) { |
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2398 // Note: class_loader & protection_domain are both null at this point. |
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2399 mirror = ss.as_java_mirror(class_loader, protection_domain, |
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2400 SignatureStream::ReturnNull, CHECK_(empty)); |
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2401 if (mirror == NULL) { |
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2402 // fall back from BCP to accessing_klass |
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2403 if (accessing_klass.not_null()) { |
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2404 class_loader = Handle(THREAD, InstanceKlass::cast(accessing_klass())->class_loader()); |
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2405 protection_domain = Handle(THREAD, InstanceKlass::cast(accessing_klass())->protection_domain()); |
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2406 } |
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2407 is_on_bcp = false; |
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2408 } |
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2409 } |
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2410 if (!is_on_bcp) { |
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2411 // Resolve, throwing a real error if it doesn't work. |
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2412 mirror = ss.as_java_mirror(class_loader, protection_domain, |
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2413 SignatureStream::NCDFError, CHECK_(empty)); |
710 | 2414 } |
2415 if (ss.at_return_type()) | |
2416 rt = Handle(THREAD, mirror); | |
2417 else | |
2418 pts->obj_at_put(arg++, mirror); | |
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2419 |
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2420 // Check accessibility. |
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2421 if (ss.is_object() && accessing_klass.not_null()) { |
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2422 Klass* sel_klass = java_lang_Class::as_Klass(mirror); |
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2423 mirror = NULL; // safety |
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2424 // Emulate ConstantPool::verify_constant_pool_resolve. |
6983 | 2425 if (sel_klass->oop_is_objArray()) |
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2426 sel_klass = ObjArrayKlass::cast(sel_klass)->bottom_klass(); |
6983 | 2427 if (sel_klass->oop_is_instance()) { |
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2428 KlassHandle sel_kh(THREAD, sel_klass); |
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2429 LinkResolver::check_klass_accessability(accessing_klass, sel_kh, CHECK_(empty)); |
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2430 } |
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2431 } |
710 | 2432 } |
2433 assert(arg == npts, ""); | |
2434 | |
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2435 // call java.lang.invoke.MethodHandleNatives::findMethodType(Class rt, Class[] pts) -> MethodType |
710 | 2436 JavaCallArguments args(Handle(THREAD, rt())); |
2437 args.push_oop(pts()); | |
2438 JavaValue result(T_OBJECT); | |
2439 JavaCalls::call_static(&result, | |
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2440 SystemDictionary::MethodHandleNatives_klass(), |
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2441 vmSymbols::findMethodHandleType_name(), |
2460 | 2442 vmSymbols::findMethodHandleType_signature(), |
710 | 2443 &args, CHECK_(empty)); |
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2444 Handle method_type(THREAD, (oop) result.get_jobject()); |
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2445 |
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2446 if (is_on_bcp) { |
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2447 // We can cache this MethodType inside the JVM. |
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2448 MutexLocker ml(SystemDictionary_lock, THREAD); |
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2449 spe = invoke_method_table()->find_entry(index, hash, signature, null_iid); |
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2450 if (spe == NULL) |
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2451 spe = invoke_method_table()->add_entry(index, hash, signature, null_iid); |
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2452 if (spe->method_type() == NULL) { |
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2453 spe->set_method_type(method_type()); |
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2454 } |
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2455 } |
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|
2456 |
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2457 // report back to the caller with the MethodType |
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2458 return method_type; |
710 | 2459 } |
2460 | |
1602 | 2461 // Ask Java code to find or construct a method handle constant. |
2462 Handle SystemDictionary::link_method_handle_constant(KlassHandle caller, | |
2463 int ref_kind, //e.g., JVM_REF_invokeVirtual | |
2464 KlassHandle callee, | |
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2465 Symbol* name_sym, |
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2466 Symbol* signature, |
1602 | 2467 TRAPS) { |
2468 Handle empty; | |
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2469 Handle name = java_lang_String::create_from_symbol(name_sym, CHECK_(empty)); |
1602 | 2470 Handle type; |
2471 if (signature->utf8_length() > 0 && signature->byte_at(0) == '(') { | |
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2472 type = find_method_handle_type(signature, caller, CHECK_(empty)); |
1602 | 2473 } else { |
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2474 ResourceMark rm(THREAD); |
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2475 SignatureStream ss(signature, false); |
1602 | 2476 if (!ss.is_done()) { |
2477 oop mirror = ss.as_java_mirror(caller->class_loader(), caller->protection_domain(), | |
2478 SignatureStream::NCDFError, CHECK_(empty)); | |
2479 type = Handle(THREAD, mirror); | |
2480 ss.next(); | |
2481 if (!ss.is_done()) type = Handle(); // error! | |
2482 } | |
2483 } | |
2484 if (type.is_null()) { | |
2485 THROW_MSG_(vmSymbols::java_lang_LinkageError(), "bad signature", empty); | |
2486 } | |
2487 | |
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2488 // call java.lang.invoke.MethodHandleNatives::linkMethodHandleConstant(Class caller, int refKind, Class callee, String name, Object type) -> MethodHandle |
1602 | 2489 JavaCallArguments args; |
2490 args.push_oop(caller->java_mirror()); // the referring class | |
2491 args.push_int(ref_kind); | |
2492 args.push_oop(callee->java_mirror()); // the target class | |
2493 args.push_oop(name()); | |
2494 args.push_oop(type()); | |
2495 JavaValue result(T_OBJECT); | |
2496 JavaCalls::call_static(&result, | |
2497 SystemDictionary::MethodHandleNatives_klass(), | |
2498 vmSymbols::linkMethodHandleConstant_name(), | |
2460 | 2499 vmSymbols::linkMethodHandleConstant_signature(), |
1602 | 2500 &args, CHECK_(empty)); |
2501 return Handle(THREAD, (oop) result.get_jobject()); | |
2502 } | |
710 | 2503 |
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2504 // Ask Java code to find or construct a java.lang.invoke.CallSite for the given |
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2505 // name and signature, as interpreted relative to the given class loader. |
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2506 methodHandle SystemDictionary::find_dynamic_call_site_invoker(KlassHandle caller, |
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2507 Handle bootstrap_specifier, |
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2508 Symbol* name, |
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2509 Symbol* type, |
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2510 Handle *appendix_result, |
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2511 Handle *method_type_result, |
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2512 TRAPS) { |
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2513 methodHandle empty; |
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2514 Handle bsm, info; |
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2515 if (java_lang_invoke_MethodHandle::is_instance(bootstrap_specifier())) { |
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2516 bsm = bootstrap_specifier; |
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2517 } else { |
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2518 assert(bootstrap_specifier->is_objArray(), ""); |
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2519 objArrayHandle args(THREAD, (objArrayOop) bootstrap_specifier()); |
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2520 int len = args->length(); |
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2521 assert(len >= 1, ""); |
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2522 bsm = Handle(THREAD, args->obj_at(0)); |
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2523 if (len > 1) { |
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2524 objArrayOop args1 = oopFactory::new_objArray(SystemDictionary::Object_klass(), len-1, CHECK_(empty)); |
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2525 for (int i = 1; i < len; i++) |
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2526 args1->obj_at_put(i-1, args->obj_at(i)); |
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2527 info = Handle(THREAD, args1); |
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2528 } |
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2529 } |
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2530 guarantee(java_lang_invoke_MethodHandle::is_instance(bsm()), |
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2531 "caller must supply a valid BSM"); |
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2532 |
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2533 Handle method_name = java_lang_String::create_from_symbol(name, CHECK_(empty)); |
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2534 Handle method_type = find_method_handle_type(type, caller, CHECK_(empty)); |
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2535 |
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2536 objArrayHandle appendix_box = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1, CHECK_(empty)); |
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2537 assert(appendix_box->obj_at(0) == NULL, ""); |
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2538 |
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2539 // call java.lang.invoke.MethodHandleNatives::linkCallSite(caller, bsm, name, mtype, info, &appendix) |
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2540 JavaCallArguments args; |
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2541 args.push_oop(caller->java_mirror()); |
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2542 args.push_oop(bsm()); |
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2543 args.push_oop(method_name()); |
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2544 args.push_oop(method_type()); |
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2545 args.push_oop(info()); |
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2546 args.push_oop(appendix_box); |
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2547 JavaValue result(T_OBJECT); |
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2548 JavaCalls::call_static(&result, |
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2549 SystemDictionary::MethodHandleNatives_klass(), |
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2550 vmSymbols::linkCallSite_name(), |
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2551 vmSymbols::linkCallSite_signature(), |
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2552 &args, CHECK_(empty)); |
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2553 Handle mname(THREAD, (oop) result.get_jobject()); |
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2554 (*method_type_result) = method_type; |
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2555 return unpack_method_and_appendix(mname, caller, appendix_box, appendix_result, THREAD); |
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2556 } |
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2557 |
0 | 2558 // Since the identity hash code for symbols changes when the symbols are |
2559 // moved from the regular perm gen (hash in the mark word) to the shared | |
2560 // spaces (hash is the address), the classes loaded into the dictionary | |
2561 // may be in the wrong buckets. | |
2562 | |
2563 void SystemDictionary::reorder_dictionary() { | |
2564 dictionary()->reorder_dictionary(); | |
2565 } | |
2566 | |
2567 | |
2568 void SystemDictionary::copy_buckets(char** top, char* end) { | |
2569 dictionary()->copy_buckets(top, end); | |
2570 } | |
2571 | |
2572 | |
2573 void SystemDictionary::copy_table(char** top, char* end) { | |
2574 dictionary()->copy_table(top, end); | |
2575 } | |
2576 | |
2577 | |
2578 void SystemDictionary::reverse() { | |
2579 dictionary()->reverse(); | |
2580 } | |
2581 | |
2582 int SystemDictionary::number_of_classes() { | |
2583 return dictionary()->number_of_entries(); | |
2584 } | |
2585 | |
2586 | |
2587 // ---------------------------------------------------------------------------- | |
2588 #ifndef PRODUCT | |
2589 | |
2590 void SystemDictionary::print() { | |
2591 dictionary()->print(); | |
2592 | |
2593 // Placeholders | |
2594 GCMutexLocker mu(SystemDictionary_lock); | |
2595 placeholders()->print(); | |
2596 | |
2597 // loader constraints - print under SD_lock | |
2598 constraints()->print(); | |
2599 } | |
2600 | |
2601 #endif | |
2602 | |
2603 void SystemDictionary::verify() { | |
2604 guarantee(dictionary() != NULL, "Verify of system dictionary failed"); | |
2605 guarantee(constraints() != NULL, | |
2606 "Verify of loader constraints failed"); | |
2607 guarantee(dictionary()->number_of_entries() >= 0 && | |
2608 placeholders()->number_of_entries() >= 0, | |
2609 "Verify of system dictionary failed"); | |
2610 | |
2611 // Verify dictionary | |
2612 dictionary()->verify(); | |
2613 | |
2614 GCMutexLocker mu(SystemDictionary_lock); | |
2615 placeholders()->verify(); | |
2616 | |
2617 // Verify constraint table | |
2618 guarantee(constraints() != NULL, "Verify of loader constraints failed"); | |
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2619 constraints()->verify(dictionary(), placeholders()); |
0 | 2620 } |
2621 | |
2622 | |
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2623 void SystemDictionary::verify_obj_klass_present(Symbol* class_name, |
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2624 ClassLoaderData* loader_data) { |
0 | 2625 GCMutexLocker mu(SystemDictionary_lock); |
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2626 Symbol* name; |
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2627 |
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2628 Klass* probe = find_class(class_name, loader_data); |
0 | 2629 if (probe == NULL) { |
2630 probe = SystemDictionary::find_shared_class(class_name); | |
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2631 if (probe == NULL) { |
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2632 name = find_placeholder(class_name, loader_data); |
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2633 } |
0 | 2634 } |
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2635 guarantee(probe != NULL || name != NULL, |
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2636 "Loaded klasses should be in SystemDictionary"); |
0 | 2637 } |
2638 | |
2639 #ifndef PRODUCT | |
2640 | |
2641 // statistics code | |
2642 class ClassStatistics: AllStatic { | |
2643 private: | |
2644 static int nclasses; // number of classes | |
2645 static int nmethods; // number of methods | |
2646 static int nmethoddata; // number of methodData | |
2647 static int class_size; // size of class objects in words | |
2648 static int method_size; // size of method objects in words | |
2649 static int debug_size; // size of debug info in methods | |
2650 static int methoddata_size; // size of methodData objects in words | |
2651 | |
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2652 static void do_class(Klass* k) { |
0 | 2653 nclasses++; |
2654 class_size += k->size(); | |
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2655 if (k->oop_is_instance()) { |
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2656 InstanceKlass* ik = (InstanceKlass*)k; |
0 | 2657 class_size += ik->methods()->size(); |
2658 class_size += ik->constants()->size(); | |
2659 class_size += ik->local_interfaces()->size(); | |
2660 class_size += ik->transitive_interfaces()->size(); | |
2661 // We do not have to count implementors, since we only store one! | |
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2662 // SSS: How should these be accounted now that they have moved? |
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2663 // class_size += ik->fields()->length(); |
0 | 2664 } |
2665 } | |
2666 | |
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2667 static void do_method(Method* m) { |
0 | 2668 nmethods++; |
2669 method_size += m->size(); | |
2670 // class loader uses same objArray for empty vectors, so don't count these | |
2671 if (m->has_stackmap_table()) { | |
2672 method_size += m->stackmap_data()->size(); | |
2673 } | |
2674 | |
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2675 MethodData* mdo = m->method_data(); |
0 | 2676 if (mdo != NULL) { |
2677 nmethoddata++; | |
2678 methoddata_size += mdo->size(); | |
2679 } | |
2680 } | |
2681 | |
2682 public: | |
2683 static void print() { | |
2684 SystemDictionary::classes_do(do_class); | |
2685 SystemDictionary::methods_do(do_method); | |
2686 tty->print_cr("Class statistics:"); | |
2687 tty->print_cr("%d classes (%d bytes)", nclasses, class_size * oopSize); | |
2688 tty->print_cr("%d methods (%d bytes = %d base + %d debug info)", nmethods, | |
2689 (method_size + debug_size) * oopSize, method_size * oopSize, debug_size * oopSize); | |
2690 tty->print_cr("%d methoddata (%d bytes)", nmethoddata, methoddata_size * oopSize); | |
2691 } | |
2692 }; | |
2693 | |
2694 | |
2695 int ClassStatistics::nclasses = 0; | |
2696 int ClassStatistics::nmethods = 0; | |
2697 int ClassStatistics::nmethoddata = 0; | |
2698 int ClassStatistics::class_size = 0; | |
2699 int ClassStatistics::method_size = 0; | |
2700 int ClassStatistics::debug_size = 0; | |
2701 int ClassStatistics::methoddata_size = 0; | |
2702 | |
2703 void SystemDictionary::print_class_statistics() { | |
2704 ResourceMark rm; | |
2705 ClassStatistics::print(); | |
2706 } | |
2707 | |
2708 | |
2709 class MethodStatistics: AllStatic { | |
2710 public: | |
2711 enum { | |
2712 max_parameter_size = 10 | |
2713 }; | |
2714 private: | |
2715 | |
2716 static int _number_of_methods; | |
2717 static int _number_of_final_methods; | |
2718 static int _number_of_static_methods; | |
2719 static int _number_of_native_methods; | |
2720 static int _number_of_synchronized_methods; | |
2721 static int _number_of_profiled_methods; | |
2722 static int _number_of_bytecodes; | |
2723 static int _parameter_size_profile[max_parameter_size]; | |
2724 static int _bytecodes_profile[Bytecodes::number_of_java_codes]; | |
2725 | |
2726 static void initialize() { | |
2727 _number_of_methods = 0; | |
2728 _number_of_final_methods = 0; | |
2729 _number_of_static_methods = 0; | |
2730 _number_of_native_methods = 0; | |
2731 _number_of_synchronized_methods = 0; | |
2732 _number_of_profiled_methods = 0; | |
2733 _number_of_bytecodes = 0; | |
2734 for (int i = 0; i < max_parameter_size ; i++) _parameter_size_profile[i] = 0; | |
2735 for (int j = 0; j < Bytecodes::number_of_java_codes; j++) _bytecodes_profile [j] = 0; | |
2736 }; | |
2737 | |
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2738 static void do_method(Method* m) { |
0 | 2739 _number_of_methods++; |
2740 // collect flag info | |
2741 if (m->is_final() ) _number_of_final_methods++; | |
2742 if (m->is_static() ) _number_of_static_methods++; | |
2743 if (m->is_native() ) _number_of_native_methods++; | |
2744 if (m->is_synchronized()) _number_of_synchronized_methods++; | |
2745 if (m->method_data() != NULL) _number_of_profiled_methods++; | |
2746 // collect parameter size info (add one for receiver, if any) | |
2747 _parameter_size_profile[MIN2(m->size_of_parameters() + (m->is_static() ? 0 : 1), max_parameter_size - 1)]++; | |
2748 // collect bytecodes info | |
2749 { | |
2750 Thread *thread = Thread::current(); | |
2751 HandleMark hm(thread); | |
2752 BytecodeStream s(methodHandle(thread, m)); | |
2753 Bytecodes::Code c; | |
2754 while ((c = s.next()) >= 0) { | |
2755 _number_of_bytecodes++; | |
2756 _bytecodes_profile[c]++; | |
2757 } | |
2758 } | |
2759 } | |
2760 | |
2761 public: | |
2762 static void print() { | |
2763 initialize(); | |
2764 SystemDictionary::methods_do(do_method); | |
2765 // generate output | |
2766 tty->cr(); | |
2767 tty->print_cr("Method statistics (static):"); | |
2768 // flag distribution | |
2769 tty->cr(); | |
2770 tty->print_cr("%6d final methods %6.1f%%", _number_of_final_methods , _number_of_final_methods * 100.0F / _number_of_methods); | |
2771 tty->print_cr("%6d static methods %6.1f%%", _number_of_static_methods , _number_of_static_methods * 100.0F / _number_of_methods); | |
2772 tty->print_cr("%6d native methods %6.1f%%", _number_of_native_methods , _number_of_native_methods * 100.0F / _number_of_methods); | |
2773 tty->print_cr("%6d synchronized methods %6.1f%%", _number_of_synchronized_methods, _number_of_synchronized_methods * 100.0F / _number_of_methods); | |
2774 tty->print_cr("%6d profiled methods %6.1f%%", _number_of_profiled_methods, _number_of_profiled_methods * 100.0F / _number_of_methods); | |
2775 // parameter size profile | |
2776 tty->cr(); | |
2777 { int tot = 0; | |
2778 int avg = 0; | |
2779 for (int i = 0; i < max_parameter_size; i++) { | |
2780 int n = _parameter_size_profile[i]; | |
2781 tot += n; | |
2782 avg += n*i; | |
2783 tty->print_cr("parameter size = %1d: %6d methods %5.1f%%", i, n, n * 100.0F / _number_of_methods); | |
2784 } | |
2785 assert(tot == _number_of_methods, "should be the same"); | |
2786 tty->print_cr(" %6d methods 100.0%%", _number_of_methods); | |
2787 tty->print_cr("(average parameter size = %3.1f including receiver, if any)", (float)avg / _number_of_methods); | |
2788 } | |
2789 // bytecodes profile | |
2790 tty->cr(); | |
2791 { int tot = 0; | |
2792 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) { | |
2793 if (Bytecodes::is_defined(i)) { | |
2794 Bytecodes::Code c = Bytecodes::cast(i); | |
2795 int n = _bytecodes_profile[c]; | |
2796 tot += n; | |
2797 tty->print_cr("%9d %7.3f%% %s", n, n * 100.0F / _number_of_bytecodes, Bytecodes::name(c)); | |
2798 } | |
2799 } | |
2800 assert(tot == _number_of_bytecodes, "should be the same"); | |
2801 tty->print_cr("%9d 100.000%%", _number_of_bytecodes); | |
2802 } | |
2803 tty->cr(); | |
2804 } | |
2805 }; | |
2806 | |
2807 int MethodStatistics::_number_of_methods; | |
2808 int MethodStatistics::_number_of_final_methods; | |
2809 int MethodStatistics::_number_of_static_methods; | |
2810 int MethodStatistics::_number_of_native_methods; | |
2811 int MethodStatistics::_number_of_synchronized_methods; | |
2812 int MethodStatistics::_number_of_profiled_methods; | |
2813 int MethodStatistics::_number_of_bytecodes; | |
2814 int MethodStatistics::_parameter_size_profile[MethodStatistics::max_parameter_size]; | |
2815 int MethodStatistics::_bytecodes_profile[Bytecodes::number_of_java_codes]; | |
2816 | |
2817 | |
2818 void SystemDictionary::print_method_statistics() { | |
2819 MethodStatistics::print(); | |
2820 } | |
2821 | |
2822 #endif // PRODUCT |