Mercurial > hg > graal-compiler
annotate src/share/vm/classfile/systemDictionary.cpp @ 2491:0654ee04b214
Merge with OpenJDK.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Fri, 22 Apr 2011 15:30:53 +0200 |
parents | 2ab52cda08e5 ed69575596ac |
children | be4ca325525a |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2011, 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" |
26 #include "classfile/dictionary.hpp" | |
27 #include "classfile/javaClasses.hpp" | |
28 #include "classfile/loaderConstraints.hpp" | |
29 #include "classfile/placeholders.hpp" | |
30 #include "classfile/resolutionErrors.hpp" | |
31 #include "classfile/systemDictionary.hpp" | |
32 #include "classfile/vmSymbols.hpp" | |
33 #include "interpreter/bytecodeStream.hpp" | |
34 #include "interpreter/interpreter.hpp" | |
35 #include "memory/gcLocker.hpp" | |
36 #include "memory/oopFactory.hpp" | |
37 #include "oops/instanceKlass.hpp" | |
38 #include "oops/instanceRefKlass.hpp" | |
39 #include "oops/klass.inline.hpp" | |
40 #include "oops/methodDataOop.hpp" | |
41 #include "oops/objArrayKlass.hpp" | |
42 #include "oops/oop.inline.hpp" | |
43 #include "oops/oop.inline2.hpp" | |
44 #include "oops/typeArrayKlass.hpp" | |
45 #include "prims/jvmtiEnvBase.hpp" | |
46 #include "prims/methodHandles.hpp" | |
47 #include "runtime/biasedLocking.hpp" | |
48 #include "runtime/fieldType.hpp" | |
49 #include "runtime/handles.inline.hpp" | |
50 #include "runtime/java.hpp" | |
51 #include "runtime/javaCalls.hpp" | |
52 #include "runtime/mutexLocker.hpp" | |
53 #include "runtime/signature.hpp" | |
54 #include "services/classLoadingService.hpp" | |
55 #include "services/threadService.hpp" | |
0 | 56 |
57 | |
1903 | 58 Dictionary* SystemDictionary::_dictionary = NULL; |
59 PlaceholderTable* SystemDictionary::_placeholders = NULL; | |
60 Dictionary* SystemDictionary::_shared_dictionary = NULL; | |
61 LoaderConstraintTable* SystemDictionary::_loader_constraints = NULL; | |
62 ResolutionErrorTable* SystemDictionary::_resolution_errors = NULL; | |
63 SymbolPropertyTable* SystemDictionary::_invoke_method_table = NULL; | |
0 | 64 |
65 | |
66 int SystemDictionary::_number_of_modifications = 0; | |
67 | |
68 oop SystemDictionary::_system_loader_lock_obj = NULL; | |
69 | |
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70 klassOop SystemDictionary::_well_known_klasses[SystemDictionary::WKID_LIMIT] |
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71 = { NULL /*, NULL...*/ }; |
0 | 72 |
73 klassOop SystemDictionary::_box_klasses[T_VOID+1] = { NULL /*, NULL...*/ }; | |
74 | |
75 oop SystemDictionary::_java_system_loader = NULL; | |
76 | |
77 bool SystemDictionary::_has_loadClassInternal = false; | |
78 bool SystemDictionary::_has_checkPackageAccess = false; | |
79 | |
80 // lazily initialized klass variables | |
81 volatile klassOop SystemDictionary::_abstract_ownable_synchronizer_klass = NULL; | |
82 | |
83 | |
84 // ---------------------------------------------------------------------------- | |
85 // Java-level SystemLoader | |
86 | |
87 oop SystemDictionary::java_system_loader() { | |
88 return _java_system_loader; | |
89 } | |
90 | |
91 void SystemDictionary::compute_java_system_loader(TRAPS) { | |
1142 | 92 KlassHandle system_klass(THREAD, WK_KLASS(ClassLoader_klass)); |
0 | 93 JavaValue result(T_OBJECT); |
94 JavaCalls::call_static(&result, | |
1142 | 95 KlassHandle(THREAD, WK_KLASS(ClassLoader_klass)), |
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96 vmSymbols::getSystemClassLoader_name(), |
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97 vmSymbols::void_classloader_signature(), |
0 | 98 CHECK); |
99 | |
100 _java_system_loader = (oop)result.get_jobject(); | |
101 } | |
102 | |
103 | |
104 // ---------------------------------------------------------------------------- | |
105 // debugging | |
106 | |
107 #ifdef ASSERT | |
108 | |
109 // return true if class_name contains no '.' (internal format is '/') | |
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110 bool SystemDictionary::is_internal_format(Symbol* class_name) { |
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111 if (class_name != NULL) { |
0 | 112 ResourceMark rm; |
113 char* name = class_name->as_C_string(); | |
114 return strchr(name, '.') == NULL; | |
115 } else { | |
116 return true; | |
117 } | |
118 } | |
119 | |
120 #endif | |
121 | |
122 // ---------------------------------------------------------------------------- | |
514 | 123 // Parallel class loading check |
124 | |
125 bool SystemDictionary::is_parallelCapable(Handle class_loader) { | |
126 if (UnsyncloadClass || class_loader.is_null()) return true; | |
127 if (AlwaysLockClassLoader) return false; | |
128 return java_lang_Class::parallelCapable(class_loader()); | |
129 } | |
130 // ---------------------------------------------------------------------------- | |
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131 // ParallelDefineClass flag does not apply to bootclass loader |
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132 bool SystemDictionary::is_parallelDefine(Handle class_loader) { |
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133 if (class_loader.is_null()) return false; |
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134 if (AllowParallelDefineClass && java_lang_Class::parallelCapable(class_loader())) { |
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135 return true; |
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136 } |
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137 return false; |
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138 } |
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139 // ---------------------------------------------------------------------------- |
0 | 140 // Resolving of classes |
141 | |
142 // Forwards to resolve_or_null | |
143 | |
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144 klassOop SystemDictionary::resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS) { |
0 | 145 klassOop klass = resolve_or_null(class_name, class_loader, protection_domain, THREAD); |
146 if (HAS_PENDING_EXCEPTION || klass == NULL) { | |
147 KlassHandle k_h(THREAD, klass); | |
148 // can return a null klass | |
149 klass = handle_resolution_exception(class_name, class_loader, protection_domain, throw_error, k_h, THREAD); | |
150 } | |
151 return klass; | |
152 } | |
153 | |
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154 klassOop SystemDictionary::handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS) { |
0 | 155 if (HAS_PENDING_EXCEPTION) { |
156 // If we have a pending exception we forward it to the caller, unless throw_error is true, | |
157 // in which case we have to check whether the pending exception is a ClassNotFoundException, | |
158 // and if so convert it to a NoClassDefFoundError | |
159 // And chain the original ClassNotFoundException | |
1142 | 160 if (throw_error && PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass())) { |
0 | 161 ResourceMark rm(THREAD); |
162 assert(klass_h() == NULL, "Should not have result with exception pending"); | |
163 Handle e(THREAD, PENDING_EXCEPTION); | |
164 CLEAR_PENDING_EXCEPTION; | |
165 THROW_MSG_CAUSE_0(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string(), e); | |
166 } else { | |
167 return NULL; | |
168 } | |
169 } | |
170 // Class not found, throw appropriate error or exception depending on value of throw_error | |
171 if (klass_h() == NULL) { | |
172 ResourceMark rm(THREAD); | |
173 if (throw_error) { | |
174 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string()); | |
175 } else { | |
176 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), class_name->as_C_string()); | |
177 } | |
178 } | |
179 return (klassOop)klass_h(); | |
180 } | |
181 | |
182 | |
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183 klassOop SystemDictionary::resolve_or_fail(Symbol* class_name, |
0 | 184 bool throw_error, TRAPS) |
185 { | |
186 return resolve_or_fail(class_name, Handle(), Handle(), throw_error, THREAD); | |
187 } | |
188 | |
189 | |
190 // Forwards to resolve_instance_class_or_null | |
191 | |
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192 klassOop SystemDictionary::resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS) { |
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193 // (tw) May we do this? |
2181 | 194 //assert(!THREAD->is_Compiler_thread(), "Can not load classes with the Compiler thread"); |
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195 if (FieldType::is_array(class_name)) { |
0 | 196 return resolve_array_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); |
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197 } else if (FieldType::is_obj(class_name)) { |
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198 ResourceMark rm(THREAD); |
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199 // Ignore wrapping L and ;. |
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200 TempNewSymbol name = SymbolTable::new_symbol(class_name->as_C_string() + 1, |
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201 class_name->utf8_length() - 2, CHECK_NULL); |
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202 return resolve_instance_class_or_null(name, class_loader, protection_domain, CHECK_NULL); |
0 | 203 } else { |
204 return resolve_instance_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); | |
205 } | |
206 } | |
207 | |
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208 klassOop SystemDictionary::resolve_or_null(Symbol* class_name, TRAPS) { |
0 | 209 return resolve_or_null(class_name, Handle(), Handle(), THREAD); |
210 } | |
211 | |
212 // Forwards to resolve_instance_class_or_null | |
213 | |
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214 klassOop SystemDictionary::resolve_array_class_or_null(Symbol* class_name, |
0 | 215 Handle class_loader, |
216 Handle protection_domain, | |
217 TRAPS) { | |
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218 assert(FieldType::is_array(class_name), "must be array"); |
0 | 219 klassOop k = NULL; |
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220 FieldArrayInfo fd; |
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221 // dimension and object_key in FieldArrayInfo are assigned as a side-effect |
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222 // of this call |
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223 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_NULL); |
0 | 224 if (t == T_OBJECT) { |
225 // naked oop "k" is OK here -- we assign back into it | |
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226 k = SystemDictionary::resolve_instance_class_or_null(fd.object_key(), |
0 | 227 class_loader, |
228 protection_domain, | |
229 CHECK_NULL); | |
230 if (k != NULL) { | |
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231 k = Klass::cast(k)->array_klass(fd.dimension(), CHECK_NULL); |
0 | 232 } |
233 } else { | |
234 k = Universe::typeArrayKlassObj(t); | |
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235 k = typeArrayKlass::cast(k)->array_klass(fd.dimension(), CHECK_NULL); |
0 | 236 } |
237 return k; | |
238 } | |
239 | |
240 | |
241 // Must be called for any super-class or super-interface resolution | |
242 // during class definition to allow class circularity checking | |
243 // super-interface callers: | |
244 // parse_interfaces - for defineClass & jvmtiRedefineClasses | |
245 // super-class callers: | |
246 // ClassFileParser - for defineClass & jvmtiRedefineClasses | |
247 // load_shared_class - while loading a class from shared archive | |
514 | 248 // resolve_instance_class_or_null: |
249 // via: handle_parallel_super_load | |
0 | 250 // when resolving a class that has an existing placeholder with |
251 // a saved superclass [i.e. a defineClass is currently in progress] | |
252 // if another thread is trying to resolve the class, it must do | |
253 // super-class checks on its own thread to catch class circularity | |
254 // This last call is critical in class circularity checking for cases | |
255 // where classloading is delegated to different threads and the | |
256 // classloader lock is released. | |
257 // Take the case: Base->Super->Base | |
258 // 1. If thread T1 tries to do a defineClass of class Base | |
259 // resolve_super_or_fail creates placeholder: T1, Base (super Super) | |
260 // 2. resolve_instance_class_or_null does not find SD or placeholder for Super | |
261 // so it tries to load Super | |
262 // 3. If we load the class internally, or user classloader uses same thread | |
263 // loadClassFromxxx or defineClass via parseClassFile Super ... | |
264 // 3.1 resolve_super_or_fail creates placeholder: T1, Super (super Base) | |
265 // 3.3 resolve_instance_class_or_null Base, finds placeholder for Base | |
266 // 3.4 calls resolve_super_or_fail Base | |
267 // 3.5 finds T1,Base -> throws class circularity | |
268 //OR 4. If T2 tries to resolve Super via defineClass Super ... | |
269 // 4.1 resolve_super_or_fail creates placeholder: T2, Super (super Base) | |
270 // 4.2 resolve_instance_class_or_null Base, finds placeholder for Base (super Super) | |
271 // 4.3 calls resolve_super_or_fail Super in parallel on own thread T2 | |
272 // 4.4 finds T2, Super -> throws class circularity | |
273 // Must be called, even if superclass is null, since this is | |
274 // where the placeholder entry is created which claims this | |
275 // thread is loading this class/classloader. | |
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276 klassOop SystemDictionary::resolve_super_or_fail(Symbol* child_name, |
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277 Symbol* class_name, |
0 | 278 Handle class_loader, |
279 Handle protection_domain, | |
280 bool is_superclass, | |
281 TRAPS) { | |
282 | |
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283 // Try to get one of the well-known klasses. |
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284 // They are trusted, and do not participate in circularities. |
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285 if (LinkWellKnownClasses) { |
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286 klassOop k = find_well_known_klass(class_name); |
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287 if (k != NULL) { |
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288 return k; |
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289 } |
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290 } |
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291 |
0 | 292 // Double-check, if child class is already loaded, just return super-class,interface |
293 // Don't add a placedholder if already loaded, i.e. already in system dictionary | |
294 // Make sure there's a placeholder for the *child* before resolving. | |
295 // Used as a claim that this thread is currently loading superclass/classloader | |
296 // Used here for ClassCircularity checks and also for heap verification | |
297 // (every instanceKlass in the heap needs to be in the system dictionary | |
298 // or have a placeholder). | |
299 // Must check ClassCircularity before checking if super class is already loaded | |
300 // | |
301 // We might not already have a placeholder if this child_name was | |
302 // first seen via resolve_from_stream (jni_DefineClass or JVM_DefineClass); | |
303 // the name of the class might not be known until the stream is actually | |
304 // parsed. | |
305 // Bugs 4643874, 4715493 | |
306 // compute_hash can have a safepoint | |
307 | |
308 unsigned int d_hash = dictionary()->compute_hash(child_name, class_loader); | |
309 int d_index = dictionary()->hash_to_index(d_hash); | |
310 unsigned int p_hash = placeholders()->compute_hash(child_name, class_loader); | |
311 int p_index = placeholders()->hash_to_index(p_hash); | |
312 // can't throw error holding a lock | |
313 bool child_already_loaded = false; | |
314 bool throw_circularity_error = false; | |
315 { | |
316 MutexLocker mu(SystemDictionary_lock, THREAD); | |
317 klassOop childk = find_class(d_index, d_hash, child_name, class_loader); | |
318 klassOop quicksuperk; | |
319 // to support // loading: if child done loading, just return superclass | |
320 // if class_name, & class_loader don't match: | |
321 // if initial define, SD update will give LinkageError | |
322 // if redefine: compare_class_versions will give HIERARCHY_CHANGED | |
323 // so we don't throw an exception here. | |
324 // see: nsk redefclass014 & java.lang.instrument Instrument032 | |
325 if ((childk != NULL ) && (is_superclass) && | |
326 ((quicksuperk = instanceKlass::cast(childk)->super()) != NULL) && | |
327 | |
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328 ((Klass::cast(quicksuperk)->name() == class_name) && |
0 | 329 (Klass::cast(quicksuperk)->class_loader() == class_loader()))) { |
330 return quicksuperk; | |
331 } else { | |
332 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, class_loader); | |
333 if (probe && probe->check_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER)) { | |
334 throw_circularity_error = true; | |
335 } | |
514 | 336 } |
337 if (!throw_circularity_error) { | |
0 | 338 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, child_name, class_loader, PlaceholderTable::LOAD_SUPER, class_name, THREAD); |
339 } | |
340 } | |
341 if (throw_circularity_error) { | |
342 ResourceMark rm(THREAD); | |
343 THROW_MSG_0(vmSymbols::java_lang_ClassCircularityError(), child_name->as_C_string()); | |
344 } | |
345 | |
346 // java.lang.Object should have been found above | |
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347 assert(class_name != NULL, "null super class for resolving"); |
0 | 348 // Resolve the super class or interface, check results on return |
349 klassOop superk = NULL; | |
350 superk = SystemDictionary::resolve_or_null(class_name, | |
351 class_loader, | |
352 protection_domain, | |
353 THREAD); | |
354 | |
355 KlassHandle superk_h(THREAD, superk); | |
356 | |
357 // Note: clean up of placeholders currently in callers of | |
358 // resolve_super_or_fail - either at update_dictionary time | |
359 // or on error | |
360 { | |
361 MutexLocker mu(SystemDictionary_lock, THREAD); | |
362 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, class_loader); | |
363 if (probe != NULL) { | |
364 probe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER); | |
365 } | |
366 } | |
367 if (HAS_PENDING_EXCEPTION || superk_h() == NULL) { | |
368 // can null superk | |
369 superk_h = KlassHandle(THREAD, handle_resolution_exception(class_name, class_loader, protection_domain, true, superk_h, THREAD)); | |
370 } | |
371 | |
372 return superk_h(); | |
373 } | |
374 | |
375 void SystemDictionary::validate_protection_domain(instanceKlassHandle klass, | |
376 Handle class_loader, | |
377 Handle protection_domain, | |
378 TRAPS) { | |
379 if(!has_checkPackageAccess()) return; | |
380 | |
381 // Now we have to call back to java to check if the initating class has access | |
382 JavaValue result(T_VOID); | |
383 if (TraceProtectionDomainVerification) { | |
384 // Print out trace information | |
385 tty->print_cr("Checking package access"); | |
386 tty->print(" - class loader: "); class_loader()->print_value_on(tty); tty->cr(); | |
387 tty->print(" - protection domain: "); protection_domain()->print_value_on(tty); tty->cr(); | |
388 tty->print(" - loading: "); klass()->print_value_on(tty); tty->cr(); | |
389 } | |
390 | |
391 assert(class_loader() != NULL, "should not have non-null protection domain for null classloader"); | |
392 | |
1142 | 393 KlassHandle system_loader(THREAD, SystemDictionary::ClassLoader_klass()); |
0 | 394 JavaCalls::call_special(&result, |
395 class_loader, | |
396 system_loader, | |
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397 vmSymbols::checkPackageAccess_name(), |
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398 vmSymbols::class_protectiondomain_signature(), |
0 | 399 Handle(THREAD, klass->java_mirror()), |
400 protection_domain, | |
401 THREAD); | |
402 | |
403 if (TraceProtectionDomainVerification) { | |
404 if (HAS_PENDING_EXCEPTION) { | |
405 tty->print_cr(" -> DENIED !!!!!!!!!!!!!!!!!!!!!"); | |
406 } else { | |
407 tty->print_cr(" -> granted"); | |
408 } | |
409 tty->cr(); | |
410 } | |
411 | |
412 if (HAS_PENDING_EXCEPTION) return; | |
413 | |
414 // If no exception has been thrown, we have validated the protection domain | |
415 // Insert the protection domain of the initiating class into the set. | |
416 { | |
417 // We recalculate the entry here -- we've called out to java since | |
418 // the last time it was calculated. | |
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419 Symbol* kn = klass->name(); |
0 | 420 unsigned int d_hash = dictionary()->compute_hash(kn, class_loader); |
421 int d_index = dictionary()->hash_to_index(d_hash); | |
422 | |
423 MutexLocker mu(SystemDictionary_lock, THREAD); | |
424 { | |
425 // Note that we have an entry, and entries can be deleted only during GC, | |
426 // so we cannot allow GC to occur while we're holding this entry. | |
427 | |
428 // We're using a No_Safepoint_Verifier to catch any place where we | |
429 // might potentially do a GC at all. | |
430 // SystemDictionary::do_unloading() asserts that classes are only | |
431 // unloaded at a safepoint. | |
432 No_Safepoint_Verifier nosafepoint; | |
433 dictionary()->add_protection_domain(d_index, d_hash, klass, class_loader, | |
434 protection_domain, THREAD); | |
435 } | |
436 } | |
437 } | |
438 | |
439 // We only get here if this thread finds that another thread | |
440 // has already claimed the placeholder token for the current operation, | |
441 // but that other thread either never owned or gave up the | |
442 // object lock | |
443 // Waits on SystemDictionary_lock to indicate placeholder table updated | |
444 // On return, caller must recheck placeholder table state | |
445 // | |
446 // We only get here if | |
447 // 1) custom classLoader, i.e. not bootstrap classloader | |
448 // 2) UnsyncloadClass not set | |
449 // 3) custom classLoader has broken the class loader objectLock | |
450 // so another thread got here in parallel | |
451 // | |
452 // lockObject must be held. | |
453 // Complicated dance due to lock ordering: | |
454 // Must first release the classloader object lock to | |
455 // allow initial definer to complete the class definition | |
456 // and to avoid deadlock | |
457 // Reclaim classloader lock object with same original recursion count | |
458 // Must release SystemDictionary_lock after notify, since | |
459 // class loader lock must be claimed before SystemDictionary_lock | |
460 // to prevent deadlocks | |
461 // | |
462 // The notify allows applications that did an untimed wait() on | |
463 // the classloader object lock to not hang. | |
464 void SystemDictionary::double_lock_wait(Handle lockObject, TRAPS) { | |
465 assert_lock_strong(SystemDictionary_lock); | |
466 | |
467 bool calledholdinglock | |
468 = ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, lockObject); | |
469 assert(calledholdinglock,"must hold lock for notify"); | |
514 | 470 assert((!(lockObject() == _system_loader_lock_obj) && !is_parallelCapable(lockObject)), "unexpected double_lock_wait"); |
0 | 471 ObjectSynchronizer::notifyall(lockObject, THREAD); |
472 intptr_t recursions = ObjectSynchronizer::complete_exit(lockObject, THREAD); | |
473 SystemDictionary_lock->wait(); | |
474 SystemDictionary_lock->unlock(); | |
475 ObjectSynchronizer::reenter(lockObject, recursions, THREAD); | |
476 SystemDictionary_lock->lock(); | |
477 } | |
478 | |
479 // If the class in is in the placeholder table, class loading is in progress | |
480 // For cases where the application changes threads to load classes, it | |
481 // is critical to ClassCircularity detection that we try loading | |
482 // the superclass on the same thread internally, so we do parallel | |
483 // super class loading here. | |
484 // This also is critical in cases where the original thread gets stalled | |
485 // even in non-circularity situations. | |
486 // Note: only one thread can define the class, but multiple can resolve | |
487 // Note: must call resolve_super_or_fail even if null super - | |
514 | 488 // to force placeholder entry creation for this class for circularity detection |
0 | 489 // Caller must check for pending exception |
490 // Returns non-null klassOop if other thread has completed load | |
491 // and we are done, | |
492 // If return null klassOop and no pending exception, the caller must load the class | |
493 instanceKlassHandle SystemDictionary::handle_parallel_super_load( | |
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494 Symbol* name, Symbol* superclassname, Handle class_loader, |
0 | 495 Handle protection_domain, Handle lockObject, TRAPS) { |
496 | |
497 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
498 unsigned int d_hash = dictionary()->compute_hash(name, class_loader); | |
499 int d_index = dictionary()->hash_to_index(d_hash); | |
500 unsigned int p_hash = placeholders()->compute_hash(name, class_loader); | |
501 int p_index = placeholders()->hash_to_index(p_hash); | |
502 | |
503 // superk is not used, resolve_super called for circularity check only | |
504 // This code is reached in two situations. One if this thread | |
505 // is loading the same class twice (e.g. ClassCircularity, or | |
506 // java.lang.instrument). | |
507 // The second is if another thread started the resolve_super first | |
508 // and has not yet finished. | |
509 // In both cases the original caller will clean up the placeholder | |
510 // entry on error. | |
511 klassOop superk = SystemDictionary::resolve_super_or_fail(name, | |
512 superclassname, | |
513 class_loader, | |
514 protection_domain, | |
515 true, | |
516 CHECK_(nh)); | |
517 // We don't redefine the class, so we just need to clean up if there | |
518 // was not an error (don't want to modify any system dictionary | |
519 // data structures). | |
520 { | |
521 MutexLocker mu(SystemDictionary_lock, THREAD); | |
522 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
523 SystemDictionary_lock->notify_all(); | |
524 } | |
525 | |
514 | 526 // parallelCapable class loaders do NOT wait for parallel superclass loads to complete |
527 // Serial class loaders and bootstrap classloader do wait for superclass loads | |
528 if (!class_loader.is_null() && is_parallelCapable(class_loader)) { | |
0 | 529 MutexLocker mu(SystemDictionary_lock, THREAD); |
530 // Check if classloading completed while we were loading superclass or waiting | |
531 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
532 if (check != NULL) { | |
533 // Klass is already loaded, so just return it | |
534 return(instanceKlassHandle(THREAD, check)); | |
535 } else { | |
536 return nh; | |
537 } | |
538 } | |
539 | |
540 // must loop to both handle other placeholder updates | |
541 // and spurious notifications | |
542 bool super_load_in_progress = true; | |
543 PlaceholderEntry* placeholder; | |
544 while (super_load_in_progress) { | |
545 MutexLocker mu(SystemDictionary_lock, THREAD); | |
546 // Check if classloading completed while we were loading superclass or waiting | |
547 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
548 if (check != NULL) { | |
549 // Klass is already loaded, so just return it | |
550 return(instanceKlassHandle(THREAD, check)); | |
551 } else { | |
552 placeholder = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
553 if (placeholder && placeholder->super_load_in_progress() ){ | |
554 // Before UnsyncloadClass: | |
555 // We only get here if the application has released the | |
556 // classloader lock when another thread was in the middle of loading a | |
557 // superclass/superinterface for this class, and now | |
558 // this thread is also trying to load this class. | |
559 // To minimize surprises, the first thread that started to | |
560 // load a class should be the one to complete the loading | |
561 // with the classfile it initially expected. | |
562 // This logic has the current thread wait once it has done | |
563 // all the superclass/superinterface loading it can, until | |
564 // the original thread completes the class loading or fails | |
565 // If it completes we will use the resulting instanceKlass | |
566 // which we will find below in the systemDictionary. | |
567 // We also get here for parallel bootstrap classloader | |
568 if (class_loader.is_null()) { | |
569 SystemDictionary_lock->wait(); | |
570 } else { | |
571 double_lock_wait(lockObject, THREAD); | |
572 } | |
573 } else { | |
574 // If not in SD and not in PH, other thread's load must have failed | |
575 super_load_in_progress = false; | |
576 } | |
577 } | |
578 } | |
579 return (nh); | |
580 } | |
581 | |
582 | |
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583 klassOop SystemDictionary::resolve_instance_class_or_null(Symbol* name, Handle class_loader, Handle protection_domain, TRAPS) { |
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584 assert(name != NULL && !FieldType::is_array(name) && |
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585 !FieldType::is_obj(name), "invalid class name"); |
0 | 586 |
587 // UseNewReflection | |
588 // Fix for 4474172; see evaluation for more details | |
589 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); | |
590 | |
591 // Do lookup to see if class already exist and the protection domain | |
592 // has the right access | |
593 unsigned int d_hash = dictionary()->compute_hash(name, class_loader); | |
594 int d_index = dictionary()->hash_to_index(d_hash); | |
595 klassOop probe = dictionary()->find(d_index, d_hash, name, class_loader, | |
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 | |
614 unsigned int p_hash = placeholders()->compute_hash(name, class_loader); | |
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); | |
633 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
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 { | |
639 placeholder = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
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 | |
650 // If the class in is in the placeholder table, class loading is in progress | |
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 | |
662 if (!class_has_been_loaded) { | |
663 | |
664 // add placeholder entry to record loading instance class | |
665 // Five cases: | |
666 // All cases need to prevent modifying bootclasssearchpath | |
667 // in parallel with a classload of same classname | |
514 | 668 // Redefineclasses uses existence of the placeholder for the duration |
669 // of the class load to prevent concurrent redefinition of not completely | |
670 // defined classes. | |
0 | 671 // case 1. traditional classloaders that rely on the classloader object lock |
672 // - no other need for LOAD_INSTANCE | |
673 // case 2. traditional classloaders that break the classloader object lock | |
674 // as a deadlock workaround. Detection of this case requires that | |
675 // this check is done while holding the classloader object lock, | |
676 // and that lock is still held when calling classloader's loadClass. | |
677 // For these classloaders, we ensure that the first requestor | |
678 // completes the load and other requestors wait for completion. | |
679 // case 3. UnsyncloadClass - don't use objectLocker | |
680 // With this flag, we allow parallel classloading of a | |
681 // class/classloader pair | |
682 // case4. Bootstrap classloader - don't own objectLocker | |
683 // This classloader supports parallelism at the classloader level, | |
684 // but only allows a single load of a class/classloader pair. | |
685 // No performance benefit and no deadlock issues. | |
514 | 686 // case 5. parallelCapable user level classloaders - without objectLocker |
687 // Allow parallel classloading of a class/classloader pair | |
0 | 688 bool throw_circularity_error = false; |
689 { | |
690 MutexLocker mu(SystemDictionary_lock, THREAD); | |
514 | 691 if (class_loader.is_null() || !is_parallelCapable(class_loader)) { |
0 | 692 PlaceholderEntry* oldprobe = placeholders()->get_entry(p_index, p_hash, name, class_loader); |
693 if (oldprobe) { | |
694 // only need check_seen_thread once, not on each loop | |
695 // 6341374 java/lang/Instrument with -Xcomp | |
696 if (oldprobe->check_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE)) { | |
697 throw_circularity_error = true; | |
698 } else { | |
699 // case 1: traditional: should never see load_in_progress. | |
700 while (!class_has_been_loaded && oldprobe && oldprobe->instance_load_in_progress()) { | |
701 | |
702 // case 4: bootstrap classloader: prevent futile classloading, | |
703 // wait on first requestor | |
704 if (class_loader.is_null()) { | |
705 SystemDictionary_lock->wait(); | |
706 } else { | |
707 // case 2: traditional with broken classloader lock. wait on first | |
708 // requestor. | |
709 double_lock_wait(lockObject, THREAD); | |
710 } | |
711 // Check if classloading completed while we were waiting | |
712 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
713 if (check != NULL) { | |
714 // Klass is already loaded, so just return it | |
715 k = instanceKlassHandle(THREAD, check); | |
716 class_has_been_loaded = true; | |
717 } | |
718 // check if other thread failed to load and cleaned up | |
719 oldprobe = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
720 } | |
721 } | |
722 } | |
723 } | |
724 // All cases: add LOAD_INSTANCE | |
514 | 725 // case 3: UnsyncloadClass || case 5: parallelCapable: allow competing threads to try |
0 | 726 // LOAD_INSTANCE in parallel |
727 // add placeholder entry even if error - callers will remove on error | |
514 | 728 if (!throw_circularity_error && !class_has_been_loaded) { |
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729 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, name, class_loader, PlaceholderTable::LOAD_INSTANCE, NULL, THREAD); |
0 | 730 // For class loaders that do not acquire the classloader object lock, |
731 // if they did not catch another thread holding LOAD_INSTANCE, | |
732 // need a check analogous to the acquire ObjectLocker/find_class | |
733 // i.e. now that we hold the LOAD_INSTANCE token on loading this class/CL | |
734 // one final check if the load has already completed | |
514 | 735 // class loaders holding the ObjectLock shouldn't find the class here |
0 | 736 klassOop check = find_class(d_index, d_hash, name, class_loader); |
737 if (check != NULL) { | |
738 // Klass is already loaded, so just return it | |
739 k = instanceKlassHandle(THREAD, check); | |
740 class_has_been_loaded = true; | |
741 newprobe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE); | |
514 | 742 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); |
743 SystemDictionary_lock->notify_all(); | |
0 | 744 } |
745 } | |
746 } | |
747 // must throw error outside of owning lock | |
748 if (throw_circularity_error) { | |
749 ResourceMark rm(THREAD); | |
750 THROW_MSG_0(vmSymbols::java_lang_ClassCircularityError(), name->as_C_string()); | |
751 } | |
752 | |
753 if (!class_has_been_loaded) { | |
754 | |
755 // Do actual loading | |
756 k = load_instance_class(name, class_loader, THREAD); | |
757 | |
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758 // For UnsyncloadClass only |
0 | 759 // If they got a linkageError, check if a parallel class load succeeded. |
760 // If it did, then for bytecode resolution the specification requires | |
761 // that we return the same result we did for the other thread, i.e. the | |
762 // successfully loaded instanceKlass | |
763 // Should not get here for classloaders that support parallelism | |
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764 // with the new cleaner mechanism, even with AllowParallelDefineClass |
514 | 765 // Bootstrap goes through here to allow for an extra guarantee check |
0 | 766 if (UnsyncloadClass || (class_loader.is_null())) { |
767 if (k.is_null() && HAS_PENDING_EXCEPTION | |
1142 | 768 && PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { |
0 | 769 MutexLocker mu(SystemDictionary_lock, THREAD); |
770 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
771 if (check != NULL) { | |
772 // Klass is already loaded, so just use it | |
773 k = instanceKlassHandle(THREAD, check); | |
774 CLEAR_PENDING_EXCEPTION; | |
775 guarantee((!class_loader.is_null()), "dup definition for bootstrap loader?"); | |
776 } | |
777 } | |
778 } | |
779 | |
780 // clean up placeholder entries for success or error | |
781 // This cleans up LOAD_INSTANCE entries | |
782 // It also cleans up LOAD_SUPER entries on errors from | |
783 // calling load_instance_class | |
784 { | |
785 MutexLocker mu(SystemDictionary_lock, THREAD); | |
786 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
787 if (probe != NULL) { | |
788 probe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE); | |
789 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
790 SystemDictionary_lock->notify_all(); | |
791 } | |
792 } | |
793 | |
794 // If everything was OK (no exceptions, no null return value), and | |
795 // class_loader is NOT the defining loader, do a little more bookkeeping. | |
796 if (!HAS_PENDING_EXCEPTION && !k.is_null() && | |
797 k->class_loader() != class_loader()) { | |
798 | |
799 check_constraints(d_index, d_hash, k, class_loader, false, THREAD); | |
800 | |
801 // Need to check for a PENDING_EXCEPTION again; check_constraints | |
802 // can throw and doesn't use the CHECK macro. | |
803 if (!HAS_PENDING_EXCEPTION) { | |
804 { // Grabbing the Compile_lock prevents systemDictionary updates | |
805 // during compilations. | |
806 MutexLocker mu(Compile_lock, THREAD); | |
807 update_dictionary(d_index, d_hash, p_index, p_hash, | |
808 k, class_loader, THREAD); | |
809 } | |
810 if (JvmtiExport::should_post_class_load()) { | |
811 Thread *thread = THREAD; | |
812 assert(thread->is_Java_thread(), "thread->is_Java_thread()"); | |
813 JvmtiExport::post_class_load((JavaThread *) thread, k()); | |
814 } | |
815 } | |
816 } | |
817 if (HAS_PENDING_EXCEPTION || k.is_null()) { | |
818 // On error, clean up placeholders | |
819 { | |
820 MutexLocker mu(SystemDictionary_lock, THREAD); | |
821 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
822 SystemDictionary_lock->notify_all(); | |
823 } | |
824 return NULL; | |
825 } | |
826 } | |
827 } | |
828 | |
829 #ifdef ASSERT | |
830 { | |
831 Handle loader (THREAD, k->class_loader()); | |
832 MutexLocker mu(SystemDictionary_lock, THREAD); | |
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833 oop kk = find_class(name, loader); |
0 | 834 assert(kk == k(), "should be present in dictionary"); |
835 } | |
836 #endif | |
837 | |
838 // return if the protection domain in NULL | |
839 if (protection_domain() == NULL) return k(); | |
840 | |
841 // Check the protection domain has the right access | |
842 { | |
843 MutexLocker mu(SystemDictionary_lock, THREAD); | |
844 // Note that we have an entry, and entries can be deleted only during GC, | |
845 // so we cannot allow GC to occur while we're holding this entry. | |
846 // We're using a No_Safepoint_Verifier to catch any place where we | |
847 // might potentially do a GC at all. | |
848 // SystemDictionary::do_unloading() asserts that classes are only | |
849 // unloaded at a safepoint. | |
850 No_Safepoint_Verifier nosafepoint; | |
851 if (dictionary()->is_valid_protection_domain(d_index, d_hash, name, | |
852 class_loader, | |
853 protection_domain)) { | |
854 return k(); | |
855 } | |
856 } | |
857 | |
858 // Verify protection domain. If it fails an exception is thrown | |
859 validate_protection_domain(k, class_loader, protection_domain, CHECK_(klassOop(NULL))); | |
860 | |
861 return k(); | |
862 } | |
863 | |
864 | |
865 // This routine does not lock the system dictionary. | |
866 // | |
867 // Since readers don't hold a lock, we must make sure that system | |
868 // dictionary entries are only removed at a safepoint (when only one | |
869 // thread is running), and are added to in a safe way (all links must | |
870 // be updated in an MT-safe manner). | |
871 // | |
872 // Callers should be aware that an entry could be added just after | |
873 // _dictionary->bucket(index) is read here, so the caller will not see | |
874 // the new entry. | |
875 | |
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876 klassOop SystemDictionary::find(Symbol* class_name, |
0 | 877 Handle class_loader, |
878 Handle protection_domain, | |
879 TRAPS) { | |
880 | |
556
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881 // UseNewReflection |
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882 // The result of this call should be consistent with the result |
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883 // of the call to resolve_instance_class_or_null(). |
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884 // See evaluation 6790209 and 4474172 for more details. |
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885 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); |
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886 |
0 | 887 unsigned int d_hash = dictionary()->compute_hash(class_name, class_loader); |
888 int d_index = dictionary()->hash_to_index(d_hash); | |
889 | |
890 { | |
891 // Note that we have an entry, and entries can be deleted only during GC, | |
892 // so we cannot allow GC to occur while we're holding this entry. | |
893 // We're using a No_Safepoint_Verifier to catch any place where we | |
894 // might potentially do a GC at all. | |
895 // SystemDictionary::do_unloading() asserts that classes are only | |
896 // unloaded at a safepoint. | |
897 No_Safepoint_Verifier nosafepoint; | |
898 return dictionary()->find(d_index, d_hash, class_name, class_loader, | |
899 protection_domain, THREAD); | |
900 } | |
901 } | |
902 | |
903 | |
904 // Look for a loaded instance or array klass by name. Do not do any loading. | |
905 // return NULL in case of error. | |
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906 klassOop SystemDictionary::find_instance_or_array_klass(Symbol* class_name, |
0 | 907 Handle class_loader, |
908 Handle protection_domain, | |
909 TRAPS) { | |
910 klassOop k = NULL; | |
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911 assert(class_name != NULL, "class name must be non NULL"); |
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912 |
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913 // Try to get one of the well-known klasses. |
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914 if (LinkWellKnownClasses) { |
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915 k = find_well_known_klass(class_name); |
132
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916 if (k != NULL) { |
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917 return k; |
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918 } |
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919 } |
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920 |
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921 if (FieldType::is_array(class_name)) { |
0 | 922 // The name refers to an array. Parse the name. |
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923 // dimension and object_key in FieldArrayInfo are assigned as a |
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924 // side-effect of this call |
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925 FieldArrayInfo fd; |
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926 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
0 | 927 if (t != T_OBJECT) { |
928 k = Universe::typeArrayKlassObj(t); | |
929 } else { | |
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930 k = SystemDictionary::find(fd.object_key(), class_loader, protection_domain, THREAD); |
0 | 931 } |
932 if (k != NULL) { | |
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933 k = Klass::cast(k)->array_klass_or_null(fd.dimension()); |
0 | 934 } |
935 } else { | |
936 k = find(class_name, class_loader, protection_domain, THREAD); | |
937 } | |
938 return k; | |
939 } | |
940 | |
132
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941 // Quick range check for names of well-known classes: |
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942 static Symbol* wk_klass_name_limits[2] = {NULL, NULL}; |
132
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943 |
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944 #ifndef PRODUCT |
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945 static int find_wkk_calls, find_wkk_probes, find_wkk_wins; |
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946 // counts for "hello world": 3983, 1616, 1075 |
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947 // => 60% hit after limit guard, 25% total win rate |
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948 #endif |
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949 |
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950 klassOop SystemDictionary::find_well_known_klass(Symbol* class_name) { |
132
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951 // A bounds-check on class_name will quickly get a negative result. |
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952 NOT_PRODUCT(find_wkk_calls++); |
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953 if (class_name >= wk_klass_name_limits[0] && |
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954 class_name <= wk_klass_name_limits[1]) { |
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955 NOT_PRODUCT(find_wkk_probes++); |
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956 vmSymbols::SID sid = vmSymbols::find_sid(class_name); |
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957 if (sid != vmSymbols::NO_SID) { |
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958 klassOop k = NULL; |
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959 switch (sid) { |
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960 #define WK_KLASS_CASE(name, symbol, ignore_option) \ |
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961 case vmSymbols::VM_SYMBOL_ENUM_NAME(symbol): \ |
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962 k = WK_KLASS(name); break; |
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963 WK_KLASSES_DO(WK_KLASS_CASE) |
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964 #undef WK_KLASS_CASE |
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965 } |
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966 NOT_PRODUCT(if (k != NULL) find_wkk_wins++); |
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967 return k; |
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968 } |
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969 } |
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970 return NULL; |
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971 } |
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972 |
0 | 973 // Note: this method is much like resolve_from_stream, but |
974 // updates no supplemental data structures. | |
975 // TODO consolidate the two methods with a helper routine? | |
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976 klassOop SystemDictionary::parse_stream(Symbol* class_name, |
0 | 977 Handle class_loader, |
978 Handle protection_domain, | |
979 ClassFileStream* st, | |
431
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980 KlassHandle host_klass, |
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981 GrowableArray<Handle>* cp_patches, |
0 | 982 TRAPS) { |
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983 TempNewSymbol parsed_name = NULL; |
0 | 984 |
985 // Parse the stream. Note that we do this even though this klass might | |
986 // already be present in the SystemDictionary, otherwise we would not | |
987 // throw potential ClassFormatErrors. | |
988 // | |
989 // Note: "name" is updated. | |
990 // Further note: a placeholder will be added for this class when | |
991 // super classes are loaded (resolve_super_or_fail). We expect this | |
992 // to be called for all classes but java.lang.Object; and we preload | |
993 // java.lang.Object through resolve_or_fail, not this path. | |
994 | |
995 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
996 class_loader, | |
997 protection_domain, | |
710 | 998 host_klass, |
999 cp_patches, | |
0 | 1000 parsed_name, |
973
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1001 true, |
0 | 1002 THREAD); |
1003 | |
1004 // We don't redefine the class, so we just need to clean up whether there | |
1005 // was an error or not (don't want to modify any system dictionary | |
1006 // data structures). | |
1007 // Parsed name could be null if we threw an error before we got far | |
1008 // enough along to parse it -- in that case, there is nothing to clean up. | |
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1009 if (parsed_name != NULL) { |
0 | 1010 unsigned int p_hash = placeholders()->compute_hash(parsed_name, |
1011 class_loader); | |
1012 int p_index = placeholders()->hash_to_index(p_hash); | |
1013 { | |
1014 MutexLocker mu(SystemDictionary_lock, THREAD); | |
1015 placeholders()->find_and_remove(p_index, p_hash, parsed_name, class_loader, THREAD); | |
1016 SystemDictionary_lock->notify_all(); | |
1017 } | |
1018 } | |
1019 | |
431
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1020 if (host_klass.not_null() && k.not_null()) { |
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1021 assert(EnableInvokeDynamic, ""); |
431
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1022 // If it's anonymous, initialize it now, since nobody else will. |
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1023 k->set_host_klass(host_klass()); |
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1024 |
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1025 { |
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1026 MutexLocker mu_r(Compile_lock, THREAD); |
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1027 |
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1028 // Add to class hierarchy, initialize vtables, and do possible |
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1029 // deoptimizations. |
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1030 add_to_hierarchy(k, CHECK_NULL); // No exception, but can block |
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1031 |
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1032 // But, do not add to system dictionary. |
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1033 } |
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1034 |
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1035 k->eager_initialize(THREAD); |
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1036 |
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1037 // notify jvmti |
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1038 if (JvmtiExport::should_post_class_load()) { |
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1039 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); |
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1040 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); |
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1041 } |
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1042 } |
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1043 |
0 | 1044 return k(); |
1045 } | |
1046 | |
1047 // Add a klass to the system from a stream (called by jni_DefineClass and | |
1048 // JVM_DefineClass). | |
1049 // Note: class_name can be NULL. In that case we do not know the name of | |
1050 // the class until we have parsed the stream. | |
1051 | |
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1052 klassOop SystemDictionary::resolve_from_stream(Symbol* class_name, |
0 | 1053 Handle class_loader, |
1054 Handle protection_domain, | |
1055 ClassFileStream* st, | |
973
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1056 bool verify, |
0 | 1057 TRAPS) { |
1058 | |
514 | 1059 // Classloaders that support parallelism, e.g. bootstrap classloader, |
1060 // or all classloaders with UnsyncloadClass do not acquire lock here | |
1061 bool DoObjectLock = true; | |
1062 if (is_parallelCapable(class_loader)) { | |
1063 DoObjectLock = false; | |
1064 } | |
1065 | |
1066 // Make sure we are synchronized on the class loader before we proceed | |
0 | 1067 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); |
1068 check_loader_lock_contention(lockObject, THREAD); | |
514 | 1069 ObjectLocker ol(lockObject, THREAD, DoObjectLock); |
0 | 1070 |
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1071 TempNewSymbol parsed_name = NULL; |
0 | 1072 |
1073 // Parse the stream. Note that we do this even though this klass might | |
1074 // already be present in the SystemDictionary, otherwise we would not | |
1075 // throw potential ClassFormatErrors. | |
1076 // | |
1077 // Note: "name" is updated. | |
1078 // Further note: a placeholder will be added for this class when | |
1079 // super classes are loaded (resolve_super_or_fail). We expect this | |
1080 // to be called for all classes but java.lang.Object; and we preload | |
1081 // java.lang.Object through resolve_or_fail, not this path. | |
1082 | |
1083 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
1084 class_loader, | |
1085 protection_domain, | |
1086 parsed_name, | |
973
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1087 verify, |
0 | 1088 THREAD); |
1089 | |
1090 const char* pkg = "java/"; | |
1091 if (!HAS_PENDING_EXCEPTION && | |
1092 !class_loader.is_null() && | |
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1093 parsed_name != NULL && |
0 | 1094 !strncmp((const char*)parsed_name->bytes(), pkg, strlen(pkg))) { |
1095 // It is illegal to define classes in the "java." package from | |
1096 // JVM_DefineClass or jni_DefineClass unless you're the bootclassloader | |
1097 ResourceMark rm(THREAD); | |
1098 char* name = parsed_name->as_C_string(); | |
1099 char* index = strrchr(name, '/'); | |
1100 *index = '\0'; // chop to just the package name | |
1101 while ((index = strchr(name, '/')) != NULL) { | |
1102 *index = '.'; // replace '/' with '.' in package name | |
1103 } | |
1104 const char* fmt = "Prohibited package name: %s"; | |
1105 size_t len = strlen(fmt) + strlen(name); | |
1106 char* message = NEW_RESOURCE_ARRAY(char, len); | |
1107 jio_snprintf(message, len, fmt, name); | |
1108 Exceptions::_throw_msg(THREAD_AND_LOCATION, | |
1109 vmSymbols::java_lang_SecurityException(), message); | |
1110 } | |
1111 | |
1112 if (!HAS_PENDING_EXCEPTION) { | |
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1113 assert(parsed_name != NULL, "Sanity"); |
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1114 assert(class_name == NULL || class_name == parsed_name, "name mismatch"); |
0 | 1115 // Verification prevents us from creating names with dots in them, this |
1116 // asserts that that's the case. | |
1117 assert(is_internal_format(parsed_name), | |
1118 "external class name format used internally"); | |
1119 | |
1120 // Add class just loaded | |
514 | 1121 // If a class loader supports parallel classloading handle parallel define requests |
1122 // find_or_define_instance_class may return a different instanceKlass | |
1123 if (is_parallelCapable(class_loader)) { | |
1124 k = find_or_define_instance_class(class_name, class_loader, k, THREAD); | |
1125 } else { | |
1126 define_instance_class(k, THREAD); | |
1127 } | |
0 | 1128 } |
1129 | |
1130 // If parsing the class file or define_instance_class failed, we | |
1131 // need to remove the placeholder added on our behalf. But we | |
1132 // must make sure parsed_name is valid first (it won't be if we had | |
1133 // a format error before the class was parsed far enough to | |
1134 // find the name). | |
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1135 if (HAS_PENDING_EXCEPTION && parsed_name != NULL) { |
0 | 1136 unsigned int p_hash = placeholders()->compute_hash(parsed_name, |
1137 class_loader); | |
1138 int p_index = placeholders()->hash_to_index(p_hash); | |
1139 { | |
1140 MutexLocker mu(SystemDictionary_lock, THREAD); | |
1141 placeholders()->find_and_remove(p_index, p_hash, parsed_name, class_loader, THREAD); | |
1142 SystemDictionary_lock->notify_all(); | |
1143 } | |
1144 return NULL; | |
1145 } | |
1146 | |
1147 // Make sure that we didn't leave a place holder in the | |
1148 // SystemDictionary; this is only done on success | |
1149 debug_only( { | |
1150 if (!HAS_PENDING_EXCEPTION) { | |
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1151 assert(parsed_name != NULL, "parsed_name is still null?"); |
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1152 Symbol* h_name = k->name(); |
0 | 1153 Handle h_loader (THREAD, k->class_loader()); |
1154 | |
1155 MutexLocker mu(SystemDictionary_lock, THREAD); | |
1156 | |
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1157 klassOop check = find_class(parsed_name, class_loader); |
0 | 1158 assert(check == k(), "should be present in the dictionary"); |
1159 | |
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1160 klassOop check2 = find_class(h_name, h_loader); |
0 | 1161 assert(check == check2, "name inconsistancy in SystemDictionary"); |
1162 } | |
1163 } ); | |
1164 | |
1165 return k(); | |
1166 } | |
1167 | |
1168 | |
1169 void SystemDictionary::set_shared_dictionary(HashtableBucket* t, int length, | |
1170 int number_of_entries) { | |
1171 assert(length == _nof_buckets * sizeof(HashtableBucket), | |
1172 "bad shared dictionary size."); | |
1173 _shared_dictionary = new Dictionary(_nof_buckets, t, number_of_entries); | |
1174 } | |
1175 | |
1176 | |
1177 // If there is a shared dictionary, then find the entry for the | |
1178 // given shared system class, if any. | |
1179 | |
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1180 klassOop SystemDictionary::find_shared_class(Symbol* class_name) { |
0 | 1181 if (shared_dictionary() != NULL) { |
1182 unsigned int d_hash = dictionary()->compute_hash(class_name, Handle()); | |
1183 int d_index = dictionary()->hash_to_index(d_hash); | |
1184 return shared_dictionary()->find_shared_class(d_index, d_hash, class_name); | |
1185 } else { | |
1186 return NULL; | |
1187 } | |
1188 } | |
1189 | |
1190 | |
1191 // Load a class from the shared spaces (found through the shared system | |
1192 // dictionary). Force the superclass and all interfaces to be loaded. | |
1193 // Update the class definition to include sibling classes and no | |
1194 // subclasses (yet). [Classes in the shared space are not part of the | |
1195 // object hierarchy until loaded.] | |
1196 | |
1197 instanceKlassHandle SystemDictionary::load_shared_class( | |
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1198 Symbol* class_name, Handle class_loader, TRAPS) { |
0 | 1199 instanceKlassHandle ik (THREAD, find_shared_class(class_name)); |
1200 return load_shared_class(ik, class_loader, THREAD); | |
1201 } | |
1202 | |
1203 // Note well! Changes to this method may affect oop access order | |
1204 // in the shared archive. Please take care to not make changes that | |
1205 // adversely affect cold start time by changing the oop access order | |
1206 // that is specified in dump.cpp MarkAndMoveOrderedReadOnly and | |
1207 // MarkAndMoveOrderedReadWrite closures. | |
1208 instanceKlassHandle SystemDictionary::load_shared_class( | |
1209 instanceKlassHandle ik, Handle class_loader, TRAPS) { | |
1210 assert(class_loader.is_null(), "non-null classloader for shared class?"); | |
1211 if (ik.not_null()) { | |
1212 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1213 Symbol* class_name = ik->name(); |
0 | 1214 |
1215 // Found the class, now load the superclass and interfaces. If they | |
1216 // are shared, add them to the main system dictionary and reset | |
1217 // their hierarchy references (supers, subs, and interfaces). | |
1218 | |
1219 if (ik->super() != NULL) { | |
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1220 Symbol* cn = ik->super()->klass_part()->name(); |
0 | 1221 resolve_super_or_fail(class_name, cn, |
1222 class_loader, Handle(), true, CHECK_(nh)); | |
1223 } | |
1224 | |
1225 objArrayHandle interfaces (THREAD, ik->local_interfaces()); | |
1226 int num_interfaces = interfaces->length(); | |
1227 for (int index = 0; index < num_interfaces; index++) { | |
1228 klassOop k = klassOop(interfaces->obj_at(index)); | |
1229 | |
1230 // Note: can not use instanceKlass::cast here because | |
1231 // interfaces' instanceKlass's C++ vtbls haven't been | |
1232 // reinitialized yet (they will be once the interface classes | |
1233 // are loaded) | |
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1234 Symbol* name = k->klass_part()->name(); |
0 | 1235 resolve_super_or_fail(class_name, name, class_loader, Handle(), false, CHECK_(nh)); |
1236 } | |
1237 | |
1238 // Adjust methods to recover missing data. They need addresses for | |
1239 // interpreter entry points and their default native method address | |
1240 // must be reset. | |
1241 | |
1242 // Updating methods must be done under a lock so multiple | |
1243 // threads don't update these in parallel | |
1244 // Shared classes are all currently loaded by the bootstrap | |
1245 // classloader, so this will never cause a deadlock on | |
1246 // a custom class loader lock. | |
1247 | |
1248 { | |
1249 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
1250 check_loader_lock_contention(lockObject, THREAD); | |
1251 ObjectLocker ol(lockObject, THREAD, true); | |
1252 | |
1253 objArrayHandle methods (THREAD, ik->methods()); | |
1254 int num_methods = methods->length(); | |
1255 for (int index2 = 0; index2 < num_methods; ++index2) { | |
1256 methodHandle m(THREAD, methodOop(methods->obj_at(index2))); | |
1257 m()->link_method(m, CHECK_(nh)); | |
1258 } | |
1259 } | |
1260 | |
1261 if (TraceClassLoading) { | |
1262 ResourceMark rm; | |
1263 tty->print("[Loaded %s", ik->external_name()); | |
1264 tty->print(" from shared objects file"); | |
1265 tty->print_cr("]"); | |
1266 } | |
1267 // notify a class loaded from shared object | |
1268 ClassLoadingService::notify_class_loaded(instanceKlass::cast(ik()), | |
1269 true /* shared class */); | |
1270 } | |
1271 return ik; | |
1272 } | |
1273 | |
1274 #ifdef KERNEL | |
1275 // Some classes on the bootstrap class path haven't been installed on the | |
1276 // system yet. Call the DownloadManager method to make them appear in the | |
1277 // bootstrap class path and try again to load the named class. | |
1278 // Note that with delegation class loaders all classes in another loader will | |
1279 // first try to call this so it'd better be fast!! | |
1280 static instanceKlassHandle download_and_retry_class_load( | |
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1281 Symbol* class_name, |
0 | 1282 TRAPS) { |
1283 | |
1284 klassOop dlm = SystemDictionary::sun_jkernel_DownloadManager_klass(); | |
1285 instanceKlassHandle nk; | |
1286 | |
1287 // If download manager class isn't loaded just return. | |
1288 if (dlm == NULL) return nk; | |
1289 | |
1290 { HandleMark hm(THREAD); | |
1291 ResourceMark rm(THREAD); | |
1292 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nk)); | |
1293 Handle class_string = java_lang_String::externalize_classname(s, CHECK_(nk)); | |
1294 | |
1295 // return value | |
1296 JavaValue result(T_OBJECT); | |
1297 | |
1298 // Call the DownloadManager. We assume that it has a lock because | |
1299 // multiple classes could be not found and downloaded at the same time. | |
1300 // class sun.misc.DownloadManager; | |
1301 // public static String getBootClassPathEntryForClass(String className); | |
1302 JavaCalls::call_static(&result, | |
1303 KlassHandle(THREAD, dlm), | |
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1304 vmSymbols::getBootClassPathEntryForClass_name(), |
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1305 vmSymbols::string_string_signature(), |
0 | 1306 class_string, |
1307 CHECK_(nk)); | |
1308 | |
1309 // Get result.string and add to bootclasspath | |
1310 assert(result.get_type() == T_OBJECT, "just checking"); | |
1311 oop obj = (oop) result.get_jobject(); | |
1312 if (obj == NULL) { return nk; } | |
1313 | |
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1314 Handle h_obj(THREAD, obj); |
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1315 char* new_class_name = java_lang_String::as_platform_dependent_str(h_obj, |
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1316 CHECK_(nk)); |
0 | 1317 |
1318 // lock the loader | |
1319 // we use this lock because JVMTI does. | |
1320 Handle loader_lock(THREAD, SystemDictionary::system_loader_lock()); | |
1321 | |
1322 ObjectLocker ol(loader_lock, THREAD); | |
1323 // add the file to the bootclasspath | |
1324 ClassLoader::update_class_path_entry_list(new_class_name, true); | |
1325 } // end HandleMark | |
1326 | |
1327 if (TraceClassLoading) { | |
1328 ClassLoader::print_bootclasspath(); | |
1329 } | |
1330 return ClassLoader::load_classfile(class_name, CHECK_(nk)); | |
1331 } | |
1332 #endif // KERNEL | |
1333 | |
1334 | |
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1335 instanceKlassHandle SystemDictionary::load_instance_class(Symbol* class_name, Handle class_loader, TRAPS) { |
0 | 1336 instanceKlassHandle nh = instanceKlassHandle(); // null Handle |
1337 if (class_loader.is_null()) { | |
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1338 |
0 | 1339 // Search the shared system dictionary for classes preloaded into the |
1340 // shared spaces. | |
1341 instanceKlassHandle k; | |
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1342 { |
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1343 PerfTraceTime vmtimer(ClassLoader::perf_shared_classload_time()); |
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1344 k = load_shared_class(class_name, class_loader, THREAD); |
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1345 } |
0 | 1346 |
1347 if (k.is_null()) { | |
1348 // Use VM class loader | |
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1349 PerfTraceTime vmtimer(ClassLoader::perf_sys_classload_time()); |
0 | 1350 k = ClassLoader::load_classfile(class_name, CHECK_(nh)); |
1351 } | |
1352 | |
1353 #ifdef KERNEL | |
1354 // If the VM class loader has failed to load the class, call the | |
1355 // DownloadManager class to make it magically appear on the classpath | |
1356 // and try again. This is only configured with the Kernel VM. | |
1357 if (k.is_null()) { | |
1358 k = download_and_retry_class_load(class_name, CHECK_(nh)); | |
1359 } | |
1360 #endif // KERNEL | |
1361 | |
514 | 1362 // find_or_define_instance_class may return a different instanceKlass |
0 | 1363 if (!k.is_null()) { |
1364 k = find_or_define_instance_class(class_name, class_loader, k, CHECK_(nh)); | |
1365 } | |
1366 return k; | |
1367 } else { | |
1368 // Use user specified class loader to load class. Call loadClass operation on class_loader. | |
1369 ResourceMark rm(THREAD); | |
1370 | |
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1371 assert(THREAD->is_Java_thread(), "must be a JavaThread"); |
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1372 JavaThread* jt = (JavaThread*) THREAD; |
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1373 |
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1374 PerfClassTraceTime vmtimer(ClassLoader::perf_app_classload_time(), |
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1375 ClassLoader::perf_app_classload_selftime(), |
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1376 ClassLoader::perf_app_classload_count(), |
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1377 jt->get_thread_stat()->perf_recursion_counts_addr(), |
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1378 jt->get_thread_stat()->perf_timers_addr(), |
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1379 PerfClassTraceTime::CLASS_LOAD); |
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1380 |
0 | 1381 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nh)); |
1382 // Translate to external class name format, i.e., convert '/' chars to '.' | |
1383 Handle string = java_lang_String::externalize_classname(s, CHECK_(nh)); | |
1384 | |
1385 JavaValue result(T_OBJECT); | |
1386 | |
1142 | 1387 KlassHandle spec_klass (THREAD, SystemDictionary::ClassLoader_klass()); |
0 | 1388 |
514 | 1389 // Call public unsynchronized loadClass(String) directly for all class loaders |
1390 // for parallelCapable class loaders. JDK >=7, loadClass(String, boolean) will | |
1391 // acquire a class-name based lock rather than the class loader object lock. | |
1392 // JDK < 7 already acquire the class loader lock in loadClass(String, boolean), | |
1393 // so the call to loadClassInternal() was not required. | |
1394 // | |
1395 // UnsyncloadClass flag means both call loadClass(String) and do | |
1396 // not acquire the class loader lock even for class loaders that are | |
1397 // not parallelCapable. This was a risky transitional | |
1398 // flag for diagnostic purposes only. It is risky to call | |
0 | 1399 // custom class loaders without synchronization. |
1400 // WARNING If a custom class loader does NOT synchronizer findClass, or callers of | |
514 | 1401 // findClass, the UnsyncloadClass flag risks unexpected timing bugs in the field. |
0 | 1402 // Do NOT assume this will be supported in future releases. |
514 | 1403 // |
1404 // Added MustCallLoadClassInternal in case we discover in the field | |
1405 // a customer that counts on this call | |
1406 if (MustCallLoadClassInternal && has_loadClassInternal()) { | |
0 | 1407 JavaCalls::call_special(&result, |
1408 class_loader, | |
1409 spec_klass, | |
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1410 vmSymbols::loadClassInternal_name(), |
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1411 vmSymbols::string_class_signature(), |
0 | 1412 string, |
1413 CHECK_(nh)); | |
1414 } else { | |
1415 JavaCalls::call_virtual(&result, | |
1416 class_loader, | |
1417 spec_klass, | |
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1418 vmSymbols::loadClass_name(), |
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1419 vmSymbols::string_class_signature(), |
0 | 1420 string, |
1421 CHECK_(nh)); | |
1422 } | |
1423 | |
1424 assert(result.get_type() == T_OBJECT, "just checking"); | |
1425 oop obj = (oop) result.get_jobject(); | |
1426 | |
1427 // Primitive classes return null since forName() can not be | |
1428 // used to obtain any of the Class objects representing primitives or void | |
1429 if ((obj != NULL) && !(java_lang_Class::is_primitive(obj))) { | |
1430 instanceKlassHandle k = | |
1431 instanceKlassHandle(THREAD, java_lang_Class::as_klassOop(obj)); | |
1432 // For user defined Java class loaders, check that the name returned is | |
1433 // the same as that requested. This check is done for the bootstrap | |
1434 // loader when parsing the class file. | |
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1435 if (class_name == k->name()) { |
0 | 1436 return k; |
1437 } | |
1438 } | |
1439 // Class is not found or has the wrong name, return NULL | |
1440 return nh; | |
1441 } | |
1442 } | |
1443 | |
1444 void SystemDictionary::define_instance_class(instanceKlassHandle k, TRAPS) { | |
1445 | |
1446 Handle class_loader_h(THREAD, k->class_loader()); | |
1447 | |
514 | 1448 // for bootstrap and other parallel classloaders don't acquire lock, |
1449 // use placeholder token | |
1450 // If a parallelCapable class loader calls define_instance_class instead of | |
1451 // find_or_define_instance_class to get here, we have a timing | |
1452 // hole with systemDictionary updates and check_constraints | |
1453 if (!class_loader_h.is_null() && !is_parallelCapable(class_loader_h)) { | |
0 | 1454 assert(ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, |
1455 compute_loader_lock_object(class_loader_h, THREAD)), | |
1456 "define called without lock"); | |
1457 } | |
1458 | |
1459 // Check class-loading constraints. Throw exception if violation is detected. | |
1460 // Grabs and releases SystemDictionary_lock | |
1461 // The check_constraints/find_class call and update_dictionary sequence | |
1462 // must be "atomic" for a specific class/classloader pair so we never | |
1463 // define two different instanceKlasses for that class/classloader pair. | |
1464 // Existing classloaders will call define_instance_class with the | |
1465 // classloader lock held | |
1466 // Parallel classloaders will call find_or_define_instance_class | |
1467 // which will require a token to perform the define class | |
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1468 Symbol* name_h = k->name(); |
0 | 1469 unsigned int d_hash = dictionary()->compute_hash(name_h, class_loader_h); |
1470 int d_index = dictionary()->hash_to_index(d_hash); | |
1471 check_constraints(d_index, d_hash, k, class_loader_h, true, CHECK); | |
1472 | |
1473 // Register class just loaded with class loader (placed in Vector) | |
1474 // Note we do this before updating the dictionary, as this can | |
1475 // fail with an OutOfMemoryError (if it does, we will *not* put this | |
1476 // class in the dictionary and will not update the class hierarchy). | |
1477 if (k->class_loader() != NULL) { | |
1478 methodHandle m(THREAD, Universe::loader_addClass_method()); | |
1479 JavaValue result(T_VOID); | |
1480 JavaCallArguments args(class_loader_h); | |
1481 args.push_oop(Handle(THREAD, k->java_mirror())); | |
1482 JavaCalls::call(&result, m, &args, CHECK); | |
1483 } | |
1484 | |
1485 // Add the new class. We need recompile lock during update of CHA. | |
1486 { | |
1487 unsigned int p_hash = placeholders()->compute_hash(name_h, class_loader_h); | |
1488 int p_index = placeholders()->hash_to_index(p_hash); | |
1489 | |
1490 MutexLocker mu_r(Compile_lock, THREAD); | |
1491 | |
1492 // Add to class hierarchy, initialize vtables, and do possible | |
1493 // deoptimizations. | |
1494 add_to_hierarchy(k, CHECK); // No exception, but can block | |
1495 | |
1496 // Add to systemDictionary - so other classes can see it. | |
1497 // Grabs and releases SystemDictionary_lock | |
1498 update_dictionary(d_index, d_hash, p_index, p_hash, | |
1499 k, class_loader_h, THREAD); | |
1500 } | |
1501 k->eager_initialize(THREAD); | |
1502 | |
1503 // notify jvmti | |
1504 if (JvmtiExport::should_post_class_load()) { | |
1505 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); | |
1506 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); | |
1507 | |
1508 } | |
1509 } | |
1510 | |
1511 // Support parallel classloading | |
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1512 // All parallel class loaders, including bootstrap classloader |
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1513 // lock a placeholder entry for this class/class_loader pair |
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1514 // to allow parallel defines of different classes for this class loader |
514 | 1515 // With AllowParallelDefine flag==true, in case they do not synchronize around |
1516 // FindLoadedClass/DefineClass, calls, we check for parallel | |
0 | 1517 // loading for them, wait if a defineClass is in progress |
1518 // and return the initial requestor's results | |
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1519 // This flag does not apply to the bootstrap classloader. |
514 | 1520 // With AllowParallelDefine flag==false, call through to define_instance_class |
1521 // which will throw LinkageError: duplicate class definition. | |
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1522 // False is the requested default. |
0 | 1523 // For better performance, the class loaders should synchronize |
514 | 1524 // findClass(), i.e. FindLoadedClass/DefineClassIfAbsent or they |
0 | 1525 // potentially waste time reading and parsing the bytestream. |
1526 // Note: VM callers should ensure consistency of k/class_name,class_loader | |
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1527 instanceKlassHandle SystemDictionary::find_or_define_instance_class(Symbol* class_name, Handle class_loader, instanceKlassHandle k, TRAPS) { |
0 | 1528 |
1529 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
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1530 Symbol* name_h = k->name(); // passed in class_name may be null |
0 | 1531 |
515 | 1532 unsigned int d_hash = dictionary()->compute_hash(name_h, class_loader); |
0 | 1533 int d_index = dictionary()->hash_to_index(d_hash); |
1534 | |
1535 // Hold SD lock around find_class and placeholder creation for DEFINE_CLASS | |
515 | 1536 unsigned int p_hash = placeholders()->compute_hash(name_h, class_loader); |
0 | 1537 int p_index = placeholders()->hash_to_index(p_hash); |
1538 PlaceholderEntry* probe; | |
1539 | |
1540 { | |
1541 MutexLocker mu(SystemDictionary_lock, THREAD); | |
1542 // First check if class already defined | |
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1543 if (UnsyncloadClass || (is_parallelDefine(class_loader))) { |
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1544 klassOop check = find_class(d_index, d_hash, name_h, class_loader); |
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1545 if (check != NULL) { |
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1546 return(instanceKlassHandle(THREAD, check)); |
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1547 } |
0 | 1548 } |
1549 | |
1550 // Acquire define token for this class/classloader | |
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1551 probe = placeholders()->find_and_add(p_index, p_hash, name_h, class_loader, PlaceholderTable::DEFINE_CLASS, NULL, THREAD); |
514 | 1552 // Wait if another thread defining in parallel |
1553 // All threads wait - even those that will throw duplicate class: otherwise | |
1554 // caller is surprised by LinkageError: duplicate, but findLoadedClass fails | |
1555 // if other thread has not finished updating dictionary | |
1556 while (probe->definer() != NULL) { | |
1557 SystemDictionary_lock->wait(); | |
1558 } | |
1559 // Only special cases allow parallel defines and can use other thread's results | |
1560 // Other cases fall through, and may run into duplicate defines | |
1561 // caught by finding an entry in the SystemDictionary | |
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1562 if ((UnsyncloadClass || is_parallelDefine(class_loader)) && (probe->instanceKlass() != NULL)) { |
0 | 1563 probe->remove_seen_thread(THREAD, PlaceholderTable::DEFINE_CLASS); |
515 | 1564 placeholders()->find_and_remove(p_index, p_hash, name_h, class_loader, THREAD); |
514 | 1565 SystemDictionary_lock->notify_all(); |
0 | 1566 #ifdef ASSERT |
515 | 1567 klassOop check = find_class(d_index, d_hash, name_h, class_loader); |
514 | 1568 assert(check != NULL, "definer missed recording success"); |
0 | 1569 #endif |
514 | 1570 return(instanceKlassHandle(THREAD, probe->instanceKlass())); |
0 | 1571 } else { |
514 | 1572 // This thread will define the class (even if earlier thread tried and had an error) |
1573 probe->set_definer(THREAD); | |
0 | 1574 } |
1575 } | |
1576 | |
1577 define_instance_class(k, THREAD); | |
1578 | |
1579 Handle linkage_exception = Handle(); // null handle | |
1580 | |
1581 // definer must notify any waiting threads | |
1582 { | |
1583 MutexLocker mu(SystemDictionary_lock, THREAD); | |
515 | 1584 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name_h, class_loader); |
0 | 1585 assert(probe != NULL, "DEFINE_CLASS placeholder lost?"); |
1586 if (probe != NULL) { | |
1587 if (HAS_PENDING_EXCEPTION) { | |
1588 linkage_exception = Handle(THREAD,PENDING_EXCEPTION); | |
1589 CLEAR_PENDING_EXCEPTION; | |
1590 } else { | |
1591 probe->set_instanceKlass(k()); | |
1592 } | |
1593 probe->set_definer(NULL); | |
1594 probe->remove_seen_thread(THREAD, PlaceholderTable::DEFINE_CLASS); | |
515 | 1595 placeholders()->find_and_remove(p_index, p_hash, name_h, class_loader, THREAD); |
0 | 1596 SystemDictionary_lock->notify_all(); |
1597 } | |
1598 } | |
1599 | |
1600 // Can't throw exception while holding lock due to rank ordering | |
1601 if (linkage_exception() != NULL) { | |
1602 THROW_OOP_(linkage_exception(), nh); // throws exception and returns | |
1603 } | |
1604 | |
1605 return k; | |
1606 } | |
1607 Handle SystemDictionary::compute_loader_lock_object(Handle class_loader, TRAPS) { | |
1608 // If class_loader is NULL we synchronize on _system_loader_lock_obj | |
1609 if (class_loader.is_null()) { | |
1610 return Handle(THREAD, _system_loader_lock_obj); | |
1611 } else { | |
1612 return class_loader; | |
1613 } | |
1614 } | |
1615 | |
1616 // This method is added to check how often we have to wait to grab loader | |
1617 // lock. The results are being recorded in the performance counters defined in | |
1618 // ClassLoader::_sync_systemLoaderLockContentionRate and | |
1619 // ClassLoader::_sync_nonSystemLoaderLockConteionRate. | |
1620 void SystemDictionary::check_loader_lock_contention(Handle loader_lock, TRAPS) { | |
1621 if (!UsePerfData) { | |
1622 return; | |
1623 } | |
1624 | |
1625 assert(!loader_lock.is_null(), "NULL lock object"); | |
1626 | |
1627 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader_lock) | |
1628 == ObjectSynchronizer::owner_other) { | |
1629 // contention will likely happen, so increment the corresponding | |
1630 // contention counter. | |
1631 if (loader_lock() == _system_loader_lock_obj) { | |
1632 ClassLoader::sync_systemLoaderLockContentionRate()->inc(); | |
1633 } else { | |
1634 ClassLoader::sync_nonSystemLoaderLockContentionRate()->inc(); | |
1635 } | |
1636 } | |
1637 } | |
1638 | |
1639 // ---------------------------------------------------------------------------- | |
1640 // Lookup | |
1641 | |
1642 klassOop SystemDictionary::find_class(int index, unsigned int hash, | |
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1643 Symbol* class_name, |
0 | 1644 Handle class_loader) { |
1645 assert_locked_or_safepoint(SystemDictionary_lock); | |
1646 assert (index == dictionary()->index_for(class_name, class_loader), | |
1647 "incorrect index?"); | |
1648 | |
1649 klassOop k = dictionary()->find_class(index, hash, class_name, class_loader); | |
1650 return k; | |
1651 } | |
1652 | |
1653 | |
1654 // Basic find on classes in the midst of being loaded | |
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1655 Symbol* SystemDictionary::find_placeholder(Symbol* class_name, |
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1656 Handle class_loader) { |
0 | 1657 assert_locked_or_safepoint(SystemDictionary_lock); |
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1658 unsigned int p_hash = placeholders()->compute_hash(class_name, class_loader); |
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1659 int p_index = placeholders()->hash_to_index(p_hash); |
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1660 return placeholders()->find_entry(p_index, p_hash, class_name, class_loader); |
0 | 1661 } |
1662 | |
1663 | |
1664 // Used for assertions and verification only | |
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1665 klassOop SystemDictionary::find_class(Symbol* class_name, Handle class_loader) { |
0 | 1666 #ifndef ASSERT |
1667 guarantee(VerifyBeforeGC || | |
1668 VerifyDuringGC || | |
1669 VerifyBeforeExit || | |
1670 VerifyAfterGC, "too expensive"); | |
1671 #endif | |
1672 assert_locked_or_safepoint(SystemDictionary_lock); | |
1673 | |
1674 // First look in the loaded class array | |
1675 unsigned int d_hash = dictionary()->compute_hash(class_name, class_loader); | |
1676 int d_index = dictionary()->hash_to_index(d_hash); | |
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1677 return find_class(d_index, d_hash, class_name, class_loader); |
0 | 1678 } |
1679 | |
1680 | |
1681 // Get the next class in the diictionary. | |
1682 klassOop SystemDictionary::try_get_next_class() { | |
1683 return dictionary()->try_get_next_class(); | |
1684 } | |
1685 | |
1686 | |
1687 // ---------------------------------------------------------------------------- | |
1688 // Update hierachy. This is done before the new klass has been added to the SystemDictionary. The Recompile_lock | |
1689 // is held, to ensure that the compiler is not using the class hierachy, and that deoptimization will kick in | |
1690 // before a new class is used. | |
1691 | |
1692 void SystemDictionary::add_to_hierarchy(instanceKlassHandle k, TRAPS) { | |
1693 assert(k.not_null(), "just checking"); | |
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1694 assert_locked_or_safepoint(Compile_lock); |
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1695 |
0 | 1696 // Link into hierachy. Make sure the vtables are initialized before linking into |
1697 k->append_to_sibling_list(); // add to superklass/sibling list | |
1698 k->process_interfaces(THREAD); // handle all "implements" declarations | |
1699 k->set_init_state(instanceKlass::loaded); | |
1700 // Now flush all code that depended on old class hierarchy. | |
1701 // Note: must be done *after* linking k into the hierarchy (was bug 12/9/97) | |
1702 // Also, first reinitialize vtable because it may have gotten out of synch | |
1703 // while the new class wasn't connected to the class hierarchy. | |
1704 Universe::flush_dependents_on(k); | |
1705 } | |
1706 | |
1707 | |
1708 // ---------------------------------------------------------------------------- | |
1709 // GC support | |
1710 | |
1711 // Following roots during mark-sweep is separated in two phases. | |
1712 // | |
1713 // The first phase follows preloaded classes and all other system | |
1714 // classes, since these will never get unloaded anyway. | |
1715 // | |
1716 // The second phase removes (unloads) unreachable classes from the | |
1717 // system dictionary and follows the remaining classes' contents. | |
1718 | |
1719 void SystemDictionary::always_strong_oops_do(OopClosure* blk) { | |
1720 // Follow preloaded classes/mirrors and system loader object | |
1721 blk->do_oop(&_java_system_loader); | |
1722 preloaded_oops_do(blk); | |
1723 always_strong_classes_do(blk); | |
1724 } | |
1725 | |
1726 | |
1727 void SystemDictionary::always_strong_classes_do(OopClosure* blk) { | |
1728 // Follow all system classes and temporary placeholders in dictionary | |
1729 dictionary()->always_strong_classes_do(blk); | |
1730 | |
1731 // Placeholders. These are *always* strong roots, as they | |
1732 // represent classes we're actively loading. | |
1733 placeholders_do(blk); | |
1734 | |
710 | 1735 // Visit extra methods |
1903 | 1736 invoke_method_table()->oops_do(blk); |
0 | 1737 } |
1738 | |
1739 | |
1740 void SystemDictionary::placeholders_do(OopClosure* blk) { | |
1741 placeholders()->oops_do(blk); | |
1742 } | |
1743 | |
1744 | |
1745 bool SystemDictionary::do_unloading(BoolObjectClosure* is_alive) { | |
1746 bool result = dictionary()->do_unloading(is_alive); | |
1747 constraints()->purge_loader_constraints(is_alive); | |
1748 resolution_errors()->purge_resolution_errors(is_alive); | |
1749 return result; | |
1750 } | |
1751 | |
1752 | |
1753 // The mirrors are scanned by shared_oops_do() which is | |
1754 // not called by oops_do(). In order to process oops in | |
1755 // a necessary order, shared_oops_do() is call by | |
1756 // Universe::oops_do(). | |
1757 void SystemDictionary::oops_do(OopClosure* f) { | |
1758 // Adjust preloaded classes and system loader object | |
1759 f->do_oop(&_java_system_loader); | |
1760 preloaded_oops_do(f); | |
1761 | |
1762 lazily_loaded_oops_do(f); | |
1763 | |
1764 // Adjust dictionary | |
1765 dictionary()->oops_do(f); | |
1766 | |
710 | 1767 // Visit extra methods |
1903 | 1768 invoke_method_table()->oops_do(f); |
710 | 1769 |
0 | 1770 // Partially loaded classes |
1771 placeholders()->oops_do(f); | |
1772 | |
1773 // Adjust constraint table | |
1774 constraints()->oops_do(f); | |
1775 | |
1776 // Adjust resolution error table | |
1777 resolution_errors()->oops_do(f); | |
1778 } | |
1779 | |
1780 | |
1781 void SystemDictionary::preloaded_oops_do(OopClosure* f) { | |
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1782 for (int k = (int)FIRST_WKID; k < (int)WKID_LIMIT; k++) { |
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1783 f->do_oop((oop*) &_well_known_klasses[k]); |
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1784 } |
0 | 1785 |
1786 { | |
1787 for (int i = 0; i < T_VOID+1; i++) { | |
1788 if (_box_klasses[i] != NULL) { | |
1789 assert(i >= T_BOOLEAN, "checking"); | |
1790 f->do_oop((oop*) &_box_klasses[i]); | |
1791 } | |
1792 } | |
1793 } | |
1794 | |
1795 // The basic type mirrors would have already been processed in | |
1796 // Universe::oops_do(), via a call to shared_oops_do(), so should | |
1797 // not be processed again. | |
1798 | |
1799 f->do_oop((oop*) &_system_loader_lock_obj); | |
1800 FilteredFieldsMap::klasses_oops_do(f); | |
1801 } | |
1802 | |
1803 void SystemDictionary::lazily_loaded_oops_do(OopClosure* f) { | |
1804 f->do_oop((oop*) &_abstract_ownable_synchronizer_klass); | |
1805 } | |
1806 | |
1807 // Just the classes from defining class loaders | |
1808 // Don't iterate over placeholders | |
1809 void SystemDictionary::classes_do(void f(klassOop)) { | |
1810 dictionary()->classes_do(f); | |
1811 } | |
1812 | |
1813 // Added for initialize_itable_for_klass | |
1814 // Just the classes from defining class loaders | |
1815 // Don't iterate over placeholders | |
1816 void SystemDictionary::classes_do(void f(klassOop, TRAPS), TRAPS) { | |
1817 dictionary()->classes_do(f, CHECK); | |
1818 } | |
1819 | |
1820 // All classes, and their class loaders | |
1821 // Don't iterate over placeholders | |
1822 void SystemDictionary::classes_do(void f(klassOop, oop)) { | |
1823 dictionary()->classes_do(f); | |
1824 } | |
1825 | |
1826 // All classes, and their class loaders | |
1827 // (added for helpers that use HandleMarks and ResourceMarks) | |
1828 // Don't iterate over placeholders | |
1829 void SystemDictionary::classes_do(void f(klassOop, oop, TRAPS), TRAPS) { | |
1830 dictionary()->classes_do(f, CHECK); | |
1831 } | |
1832 | |
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1833 void SystemDictionary::placeholders_do(void f(Symbol*, oop)) { |
0 | 1834 placeholders()->entries_do(f); |
1835 } | |
1836 | |
1837 void SystemDictionary::methods_do(void f(methodOop)) { | |
1838 dictionary()->methods_do(f); | |
1903 | 1839 invoke_method_table()->methods_do(f); |
0 | 1840 } |
1841 | |
1842 // ---------------------------------------------------------------------------- | |
1843 // Lazily load klasses | |
1844 | |
1845 void SystemDictionary::load_abstract_ownable_synchronizer_klass(TRAPS) { | |
1846 assert(JDK_Version::is_gte_jdk16x_version(), "Must be JDK 1.6 or later"); | |
1847 | |
1848 // if multiple threads calling this function, only one thread will load | |
1849 // the class. The other threads will find the loaded version once the | |
1850 // class is loaded. | |
1851 klassOop aos = _abstract_ownable_synchronizer_klass; | |
1852 if (aos == NULL) { | |
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1853 klassOop k = resolve_or_fail(vmSymbols::java_util_concurrent_locks_AbstractOwnableSynchronizer(), true, CHECK); |
0 | 1854 // Force a fence to prevent any read before the write completes |
1855 OrderAccess::fence(); | |
1856 _abstract_ownable_synchronizer_klass = k; | |
1857 } | |
1858 } | |
1859 | |
1860 // ---------------------------------------------------------------------------- | |
1861 // Initialization | |
1862 | |
1863 void SystemDictionary::initialize(TRAPS) { | |
1864 // Allocate arrays | |
1865 assert(dictionary() == NULL, | |
1866 "SystemDictionary should only be initialized once"); | |
1903 | 1867 _dictionary = new Dictionary(_nof_buckets); |
1868 _placeholders = new PlaceholderTable(_nof_buckets); | |
0 | 1869 _number_of_modifications = 0; |
1903 | 1870 _loader_constraints = new LoaderConstraintTable(_loader_constraint_size); |
1871 _resolution_errors = new ResolutionErrorTable(_resolution_error_size); | |
1872 _invoke_method_table = new SymbolPropertyTable(_invoke_method_size); | |
0 | 1873 |
1874 // Allocate private object used as system class loader lock | |
1875 _system_loader_lock_obj = oopFactory::new_system_objArray(0, CHECK); | |
1876 // Initialize basic classes | |
1877 initialize_preloaded_classes(CHECK); | |
1878 } | |
1879 | |
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1880 // Compact table of directions on the initialization of klasses: |
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1881 static const short wk_init_info[] = { |
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1882 #define WK_KLASS_INIT_INFO(name, symbol, option) \ |
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1883 ( ((int)vmSymbols::VM_SYMBOL_ENUM_NAME(symbol) \ |
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1884 << SystemDictionary::CEIL_LG_OPTION_LIMIT) \ |
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1885 | (int)SystemDictionary::option ), |
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1886 WK_KLASSES_DO(WK_KLASS_INIT_INFO) |
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1887 #undef WK_KLASS_INIT_INFO |
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1888 0 |
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1889 }; |
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1890 |
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1891 bool SystemDictionary::initialize_wk_klass(WKID id, int init_opt, TRAPS) { |
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1892 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1893 int info = wk_init_info[id - FIRST_WKID]; |
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1894 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1895 Symbol* symbol = vmSymbols::symbol_at((vmSymbols::SID)sid); |
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1896 klassOop* klassp = &_well_known_klasses[id]; |
2460 | 1897 bool must_load = (init_opt < SystemDictionary::Opt); |
1898 bool try_load = true; | |
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1899 if (init_opt == SystemDictionary::Opt_Kernel) { |
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1900 #ifndef KERNEL |
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1901 try_load = false; |
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1902 #endif //KERNEL |
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1903 } |
2460 | 1904 if ((*klassp) == NULL && try_load) { |
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1905 if (must_load) { |
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1906 (*klassp) = resolve_or_fail(symbol, true, CHECK_0); // load required class |
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1907 } else { |
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1908 (*klassp) = resolve_or_null(symbol, CHECK_0); // load optional klass |
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1909 } |
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1910 } |
2460 | 1911 return ((*klassp) != NULL); |
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1912 } |
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1913 |
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1914 void SystemDictionary::initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS) { |
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1915 assert((int)start_id <= (int)limit_id, "IDs are out of order!"); |
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1916 for (int id = (int)start_id; id < (int)limit_id; id++) { |
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1917 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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1918 int info = wk_init_info[id - FIRST_WKID]; |
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1919 int sid = (info >> CEIL_LG_OPTION_LIMIT); |
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1920 int opt = (info & right_n_bits(CEIL_LG_OPTION_LIMIT)); |
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1921 |
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1922 initialize_wk_klass((WKID)id, opt, CHECK); |
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1923 |
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1924 // Update limits, so find_well_known_klass can be very fast: |
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1925 Symbol* s = vmSymbols::symbol_at((vmSymbols::SID)sid); |
132
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1926 if (wk_klass_name_limits[1] == NULL) { |
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1927 wk_klass_name_limits[0] = wk_klass_name_limits[1] = s; |
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1928 } else if (wk_klass_name_limits[1] < s) { |
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1929 wk_klass_name_limits[1] = s; |
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1930 } else if (wk_klass_name_limits[0] > s) { |
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1931 wk_klass_name_limits[0] = s; |
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1932 } |
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1933 } |
710 | 1934 |
1935 // move the starting value forward to the limit: | |
1936 start_id = limit_id; | |
132
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1937 } |
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1938 |
0 | 1939 |
1940 void SystemDictionary::initialize_preloaded_classes(TRAPS) { | |
1142 | 1941 assert(WK_KLASS(Object_klass) == NULL, "preloaded classes should only be initialized once"); |
0 | 1942 // Preload commonly used klasses |
132
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1943 WKID scan = FIRST_WKID; |
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1944 // first do Object, String, Class |
1142 | 1945 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Class_klass), scan, CHECK); |
132
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1946 |
1142 | 1947 debug_only(instanceKlass::verify_class_klass_nonstatic_oop_maps(WK_KLASS(Class_klass))); |
132
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1948 |
0 | 1949 // Fixup mirrors for classes loaded before java.lang.Class. |
1950 // These calls iterate over the objects currently in the perm gen | |
1951 // so calling them at this point is matters (not before when there | |
1952 // are fewer objects and not later after there are more objects | |
1953 // in the perm gen. | |
1954 Universe::initialize_basic_type_mirrors(CHECK); | |
1955 Universe::fixup_mirrors(CHECK); | |
1956 | |
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1957 // do a bunch more: |
1142 | 1958 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Reference_klass), scan, CHECK); |
0 | 1959 |
1960 // Preload ref klasses and set reference types | |
1142 | 1961 instanceKlass::cast(WK_KLASS(Reference_klass))->set_reference_type(REF_OTHER); |
1962 instanceRefKlass::update_nonstatic_oop_maps(WK_KLASS(Reference_klass)); | |
0 | 1963 |
1142 | 1964 initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(PhantomReference_klass), scan, CHECK); |
1965 instanceKlass::cast(WK_KLASS(SoftReference_klass))->set_reference_type(REF_SOFT); | |
1966 instanceKlass::cast(WK_KLASS(WeakReference_klass))->set_reference_type(REF_WEAK); | |
1967 instanceKlass::cast(WK_KLASS(FinalReference_klass))->set_reference_type(REF_FINAL); | |
1968 instanceKlass::cast(WK_KLASS(PhantomReference_klass))->set_reference_type(REF_PHANTOM); | |
132
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1969 |
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1970 // JSR 292 classes |
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1971 WKID jsr292_group_start = WK_KLASS_ENUM_NAME(MethodHandle_klass); |
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1972 WKID jsr292_group_end = WK_KLASS_ENUM_NAME(CallSite_klass); |
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1973 initialize_wk_klasses_until(jsr292_group_start, scan, CHECK); |
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1974 if (EnableInvokeDynamic) { |
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1975 initialize_wk_klasses_through(jsr292_group_end, scan, CHECK); |
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1976 } else { |
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1977 // Skip the JSR 292 classes, if not enabled. |
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1978 scan = WKID(jsr292_group_end + 1); |
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1979 } |
710 | 1980 |
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1981 initialize_wk_klasses_until(WKID_LIMIT, scan, CHECK); |
0 | 1982 |
1142 | 1983 _box_klasses[T_BOOLEAN] = WK_KLASS(Boolean_klass); |
1984 _box_klasses[T_CHAR] = WK_KLASS(Character_klass); | |
1985 _box_klasses[T_FLOAT] = WK_KLASS(Float_klass); | |
1986 _box_klasses[T_DOUBLE] = WK_KLASS(Double_klass); | |
1987 _box_klasses[T_BYTE] = WK_KLASS(Byte_klass); | |
1988 _box_klasses[T_SHORT] = WK_KLASS(Short_klass); | |
1989 _box_klasses[T_INT] = WK_KLASS(Integer_klass); | |
1990 _box_klasses[T_LONG] = WK_KLASS(Long_klass); | |
132
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1991 //_box_klasses[T_OBJECT] = WK_KLASS(object_klass); |
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1992 //_box_klasses[T_ARRAY] = WK_KLASS(object_klass); |
0 | 1993 |
1994 #ifdef KERNEL | |
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1995 if (sun_jkernel_DownloadManager_klass() == NULL) { |
0 | 1996 warning("Cannot find sun/jkernel/DownloadManager"); |
1997 } | |
1998 #endif // KERNEL | |
514 | 1999 |
0 | 2000 { // Compute whether we should use loadClass or loadClassInternal when loading classes. |
1142 | 2001 methodOop method = instanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::loadClassInternal_name(), vmSymbols::string_class_signature()); |
0 | 2002 _has_loadClassInternal = (method != NULL); |
2003 } | |
2004 { // Compute whether we should use checkPackageAccess or NOT | |
1142 | 2005 methodOop method = instanceKlass::cast(ClassLoader_klass())->find_method(vmSymbols::checkPackageAccess_name(), vmSymbols::class_protectiondomain_signature()); |
0 | 2006 _has_checkPackageAccess = (method != NULL); |
2007 } | |
2008 } | |
2009 | |
2010 // Tells if a given klass is a box (wrapper class, such as java.lang.Integer). | |
2011 // If so, returns the basic type it holds. If not, returns T_OBJECT. | |
2012 BasicType SystemDictionary::box_klass_type(klassOop k) { | |
2013 assert(k != NULL, ""); | |
2014 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { | |
2015 if (_box_klasses[i] == k) | |
2016 return (BasicType)i; | |
2017 } | |
2018 return T_OBJECT; | |
2019 } | |
2020 | |
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2021 KlassHandle SystemDictionaryHandles::box_klass(BasicType t) { |
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2022 if (t >= T_BOOLEAN && t <= T_VOID) |
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2023 return KlassHandle(&SystemDictionary::_box_klasses[t], true); |
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2024 else |
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2025 return KlassHandle(); |
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2026 } |
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2027 |
0 | 2028 // Constraints on class loaders. The details of the algorithm can be |
2029 // found in the OOPSLA'98 paper "Dynamic Class Loading in the Java | |
2030 // Virtual Machine" by Sheng Liang and Gilad Bracha. The basic idea is | |
2031 // that the system dictionary needs to maintain a set of contraints that | |
2032 // must be satisfied by all classes in the dictionary. | |
2033 // if defining is true, then LinkageError if already in systemDictionary | |
2034 // if initiating loader, then ok if instanceKlass matches existing entry | |
2035 | |
2036 void SystemDictionary::check_constraints(int d_index, unsigned int d_hash, | |
2037 instanceKlassHandle k, | |
2038 Handle class_loader, bool defining, | |
2039 TRAPS) { | |
2040 const char *linkage_error = NULL; | |
2041 { | |
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2042 Symbol* name = k->name(); |
0 | 2043 MutexLocker mu(SystemDictionary_lock, THREAD); |
2044 | |
2045 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
2046 if (check != (klassOop)NULL) { | |
2047 // if different instanceKlass - duplicate class definition, | |
2048 // else - ok, class loaded by a different thread in parallel, | |
2049 // we should only have found it if it was done loading and ok to use | |
2050 // system dictionary only holds instance classes, placeholders | |
2051 // also holds array classes | |
2052 | |
2053 assert(check->klass_part()->oop_is_instance(), "noninstance in systemdictionary"); | |
2054 if ((defining == true) || (k() != check)) { | |
2055 linkage_error = "loader (instance of %s): attempted duplicate class " | |
2056 "definition for name: \"%s\""; | |
2057 } else { | |
2058 return; | |
2059 } | |
2060 } | |
2061 | |
2062 #ifdef ASSERT | |
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2063 Symbol* ph_check = find_placeholder(name, class_loader); |
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2064 assert(ph_check == NULL || ph_check == name, "invalid symbol"); |
0 | 2065 #endif |
2066 | |
2067 if (linkage_error == NULL) { | |
2068 if (constraints()->check_or_update(k, class_loader, name) == false) { | |
2069 linkage_error = "loader constraint violation: loader (instance of %s)" | |
2070 " previously initiated loading for a different type with name \"%s\""; | |
2071 } | |
2072 } | |
2073 } | |
2074 | |
2075 // Throw error now if needed (cannot throw while holding | |
2076 // SystemDictionary_lock because of rank ordering) | |
2077 | |
2078 if (linkage_error) { | |
2079 ResourceMark rm(THREAD); | |
2080 const char* class_loader_name = loader_name(class_loader()); | |
2081 char* type_name = k->name()->as_C_string(); | |
2082 size_t buflen = strlen(linkage_error) + strlen(class_loader_name) + | |
2083 strlen(type_name); | |
2084 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
2085 jio_snprintf(buf, buflen, linkage_error, class_loader_name, type_name); | |
2086 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); | |
2087 } | |
2088 } | |
2089 | |
2090 | |
2091 // Update system dictionary - done after check_constraint and add_to_hierachy | |
2092 // have been called. | |
2093 void SystemDictionary::update_dictionary(int d_index, unsigned int d_hash, | |
2094 int p_index, unsigned int p_hash, | |
2095 instanceKlassHandle k, | |
2096 Handle class_loader, | |
2097 TRAPS) { | |
2098 // Compile_lock prevents systemDictionary updates during compilations | |
2099 assert_locked_or_safepoint(Compile_lock); | |
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2100 Symbol* name = k->name(); |
0 | 2101 |
2102 { | |
2103 MutexLocker mu1(SystemDictionary_lock, THREAD); | |
2104 | |
2105 // See whether biased locking is enabled and if so set it for this | |
2106 // klass. | |
2107 // Note that this must be done past the last potential blocking | |
2108 // point / safepoint. We enable biased locking lazily using a | |
2109 // VM_Operation to iterate the SystemDictionary and installing the | |
2110 // biasable mark word into each instanceKlass's prototype header. | |
2111 // To avoid race conditions where we accidentally miss enabling the | |
2112 // optimization for one class in the process of being added to the | |
2113 // dictionary, we must not safepoint after the test of | |
2114 // BiasedLocking::enabled(). | |
2115 if (UseBiasedLocking && BiasedLocking::enabled()) { | |
2116 // Set biased locking bit for all loaded classes; it will be | |
2117 // cleared if revocation occurs too often for this type | |
2118 // NOTE that we must only do this when the class is initally | |
2119 // defined, not each time it is referenced from a new class loader | |
2120 if (k->class_loader() == class_loader()) { | |
2121 k->set_prototype_header(markOopDesc::biased_locking_prototype()); | |
2122 } | |
2123 } | |
2124 | |
2125 // Check for a placeholder. If there, remove it and make a | |
2126 // new system dictionary entry. | |
2127 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
2128 klassOop sd_check = find_class(d_index, d_hash, name, class_loader); | |
2129 if (sd_check == NULL) { | |
2130 dictionary()->add_klass(name, class_loader, k); | |
2131 notice_modification(); | |
2132 } | |
2133 #ifdef ASSERT | |
2134 sd_check = find_class(d_index, d_hash, name, class_loader); | |
2135 assert (sd_check != NULL, "should have entry in system dictionary"); | |
2136 // Changed to allow PH to remain to complete class circularity checking | |
2137 // while only one thread can define a class at one time, multiple | |
2138 // classes can resolve the superclass for a class at one time, | |
2139 // and the placeholder is used to track that | |
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2140 // Symbol* ph_check = find_placeholder(name, class_loader); |
0 | 2141 // assert (ph_check == NULL, "should not have a placeholder entry"); |
2142 #endif | |
2143 SystemDictionary_lock->notify_all(); | |
2144 } | |
2145 } | |
2146 | |
2147 | |
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2148 // Try to find a class name using the loader constraints. The |
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2149 // loader constraints might know about a class that isn't fully loaded |
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2150 // yet and these will be ignored. |
0 | 2151 klassOop SystemDictionary::find_constrained_instance_or_array_klass( |
2177
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2152 Symbol* class_name, Handle class_loader, TRAPS) { |
0 | 2153 |
2154 // First see if it has been loaded directly. | |
2155 // Force the protection domain to be null. (This removes protection checks.) | |
2156 Handle no_protection_domain; | |
2157 klassOop klass = find_instance_or_array_klass(class_name, class_loader, | |
2158 no_protection_domain, CHECK_NULL); | |
2159 if (klass != NULL) | |
2160 return klass; | |
2161 | |
2162 // Now look to see if it has been loaded elsewhere, and is subject to | |
2163 // a loader constraint that would require this loader to return the | |
2164 // klass that is already loaded. | |
2177
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2165 if (FieldType::is_array(class_name)) { |
1336 | 2166 // For array classes, their klassOops are not kept in the |
2167 // constraint table. The element klassOops are. | |
2177
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2168 FieldArrayInfo fd; |
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2169 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(NULL)); |
0 | 2170 if (t != T_OBJECT) { |
2171 klass = Universe::typeArrayKlassObj(t); | |
2172 } else { | |
2173 MutexLocker mu(SystemDictionary_lock, THREAD); | |
2177
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2174 klass = constraints()->find_constrained_klass(fd.object_key(), class_loader); |
0 | 2175 } |
1336 | 2176 // If element class already loaded, allocate array klass |
0 | 2177 if (klass != NULL) { |
2177
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2178 klass = Klass::cast(klass)->array_klass_or_null(fd.dimension()); |
0 | 2179 } |
2180 } else { | |
2181 MutexLocker mu(SystemDictionary_lock, THREAD); | |
2182 // Non-array classes are easy: simply check the constraint table. | |
2183 klass = constraints()->find_constrained_klass(class_name, class_loader); | |
2184 } | |
2185 | |
2186 return klass; | |
2187 } | |
2188 | |
2189 | |
2177
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2190 bool SystemDictionary::add_loader_constraint(Symbol* class_name, |
0 | 2191 Handle class_loader1, |
2192 Handle class_loader2, | |
2193 Thread* THREAD) { | |
2177
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2194 Symbol* constraint_name = NULL; |
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2195 if (!FieldType::is_array(class_name)) { |
1336 | 2196 constraint_name = class_name; |
2197 } else { | |
2198 // For array classes, their klassOops are not kept in the | |
2199 // constraint table. The element classes are. | |
2177
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2200 FieldArrayInfo fd; |
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2201 BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(false)); |
1336 | 2202 // primitive types always pass |
2203 if (t != T_OBJECT) { | |
2204 return true; | |
2205 } else { | |
2177
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2206 constraint_name = fd.object_key(); |
1336 | 2207 } |
2208 } | |
2209 unsigned int d_hash1 = dictionary()->compute_hash(constraint_name, class_loader1); | |
0 | 2210 int d_index1 = dictionary()->hash_to_index(d_hash1); |
2211 | |
1336 | 2212 unsigned int d_hash2 = dictionary()->compute_hash(constraint_name, class_loader2); |
0 | 2213 int d_index2 = dictionary()->hash_to_index(d_hash2); |
2214 { | |
1336 | 2215 MutexLocker mu_s(SystemDictionary_lock, THREAD); |
0 | 2216 |
1336 | 2217 // Better never do a GC while we're holding these oops |
2218 No_Safepoint_Verifier nosafepoint; | |
0 | 2219 |
1336 | 2220 klassOop klass1 = find_class(d_index1, d_hash1, constraint_name, class_loader1); |
2221 klassOop klass2 = find_class(d_index2, d_hash2, constraint_name, class_loader2); | |
2222 return constraints()->add_entry(constraint_name, klass1, class_loader1, | |
2223 klass2, class_loader2); | |
0 | 2224 } |
2225 } | |
2226 | |
2227 // Add entry to resolution error table to record the error when the first | |
2228 // attempt to resolve a reference to a class has failed. | |
2177
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2229 void SystemDictionary::add_resolution_error(constantPoolHandle pool, int which, Symbol* error) { |
0 | 2230 unsigned int hash = resolution_errors()->compute_hash(pool, which); |
2231 int index = resolution_errors()->hash_to_index(hash); | |
2232 { | |
2233 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
2234 resolution_errors()->add_entry(index, hash, pool, which, error); | |
2235 } | |
2236 } | |
2237 | |
2238 // Lookup resolution error table. Returns error if found, otherwise NULL. | |
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2239 Symbol* SystemDictionary::find_resolution_error(constantPoolHandle pool, int which) { |
0 | 2240 unsigned int hash = resolution_errors()->compute_hash(pool, which); |
2241 int index = resolution_errors()->hash_to_index(hash); | |
2242 { | |
2243 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
2244 ResolutionErrorEntry* entry = resolution_errors()->find_entry(index, hash, pool, which); | |
2177
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2245 return (entry != NULL) ? entry->error() : (Symbol*)NULL; |
0 | 2246 } |
2247 } | |
2248 | |
2249 | |
665
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2250 // Signature constraints ensure that callers and callees agree about |
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2251 // the meaning of type names in their signatures. This routine is the |
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2252 // intake for constraints. It collects them from several places: |
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2253 // |
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2254 // * LinkResolver::resolve_method (if check_access is true) requires |
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2255 // that the resolving class (the caller) and the defining class of |
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2256 // the resolved method (the callee) agree on each type in the |
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2257 // method's signature. |
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2258 // |
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2259 // * LinkResolver::resolve_interface_method performs exactly the same |
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2260 // checks. |
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2261 // |
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2262 // * LinkResolver::resolve_field requires that the constant pool |
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2263 // attempting to link to a field agree with the field's defining |
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2264 // class about the type of the field signature. |
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2265 // |
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2266 // * klassVtable::initialize_vtable requires that, when a class |
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2267 // overrides a vtable entry allocated by a superclass, that the |
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2268 // overriding method (i.e., the callee) agree with the superclass |
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2269 // on each type in the method's signature. |
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2270 // |
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2271 // * klassItable::initialize_itable requires that, when a class fills |
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2272 // in its itables, for each non-abstract method installed in an |
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2273 // itable, the method (i.e., the callee) agree with the interface |
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2274 // on each type in the method's signature. |
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2275 // |
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2276 // All those methods have a boolean (check_access, checkconstraints) |
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2277 // which turns off the checks. This is used from specialized contexts |
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2278 // such as bootstrapping, dumping, and debugging. |
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2279 // |
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2280 // No direct constraint is placed between the class and its |
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2281 // supertypes. Constraints are only placed along linked relations |
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2282 // between callers and callees. When a method overrides or implements |
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2283 // an abstract method in a supertype (superclass or interface), the |
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2284 // constraints are placed as if the supertype were the caller to the |
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2285 // overriding method. (This works well, since callers to the |
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2286 // supertype have already established agreement between themselves and |
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2287 // the supertype.) As a result of all this, a class can disagree with |
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2288 // its supertype about the meaning of a type name, as long as that |
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2289 // class neither calls a relevant method of the supertype, nor is |
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2290 // called (perhaps via an override) from the supertype. |
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2291 // |
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2292 // |
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2293 // SystemDictionary::check_signature_loaders(sig, l1, l2) |
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2294 // |
0 | 2295 // Make sure all class components (including arrays) in the given |
2296 // signature will be resolved to the same class in both loaders. | |
2297 // Returns the name of the type that failed a loader constraint check, or | |
2298 // NULL if no constraint failed. The returned C string needs cleaning up | |
665
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2299 // with a ResourceMark in the caller. No exception except OOME is thrown. |
1336 | 2300 // Arrays are not added to the loader constraint table, their elements are. |
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2301 char* SystemDictionary::check_signature_loaders(Symbol* signature, |
0 | 2302 Handle loader1, Handle loader2, |
2303 bool is_method, TRAPS) { | |
2304 // Nothing to do if loaders are the same. | |
2305 if (loader1() == loader2()) { | |
2306 return NULL; | |
2307 } | |
2308 | |
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2309 ResourceMark rm(THREAD); |
0 | 2310 SignatureStream sig_strm(signature, is_method); |
2311 while (!sig_strm.is_done()) { | |
2312 if (sig_strm.is_object()) { | |
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2313 Symbol* s = sig_strm.as_symbol(CHECK_NULL); |
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2314 Symbol* sig = s; |
0 | 2315 if (!add_loader_constraint(sig, loader1, loader2, THREAD)) { |
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2316 return sig->as_C_string(); |
0 | 2317 } |
2318 } | |
2319 sig_strm.next(); | |
2320 } | |
2321 return NULL; | |
2322 } | |
2323 | |
2324 | |
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2325 methodOop SystemDictionary::find_method_handle_invoke(Symbol* name, |
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2326 Symbol* signature, |
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2327 KlassHandle accessing_klass, |
710 | 2328 TRAPS) { |
2416
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2329 if (!EnableInvokeDynamic) return NULL; |
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2330 vmSymbols::SID name_id = vmSymbols::find_sid(name); |
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2331 assert(name_id != vmSymbols::NO_SID, "must be a known name"); |
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2332 unsigned int hash = invoke_method_table()->compute_hash(signature, name_id); |
710 | 2333 int index = invoke_method_table()->hash_to_index(hash); |
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2334 SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature, name_id); |
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2335 methodHandle non_cached_result; |
710 | 2336 if (spe == NULL || spe->property_oop() == NULL) { |
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2337 spe = NULL; |
710 | 2338 // Must create lots of stuff here, but outside of the SystemDictionary lock. |
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2339 // (tw) May we do this? |
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2340 //if (THREAD->is_Compiler_thread()) |
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2341 // return NULL; // do not attempt from within compiler |
2460 | 2342 bool for_invokeGeneric = (name_id != vmSymbols::VM_SYMBOL_ENUM_NAME(invokeExact_name)); |
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2343 bool found_on_bcp = false; |
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2344 Handle mt = find_method_handle_type(signature, accessing_klass, |
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2345 for_invokeGeneric, |
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2346 found_on_bcp, CHECK_NULL); |
710 | 2347 KlassHandle mh_klass = SystemDictionaryHandles::MethodHandle_klass(); |
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2348 methodHandle m = methodOopDesc::make_invoke_method(mh_klass, name, signature, |
710 | 2349 mt, CHECK_NULL); |
2350 // Now grab the lock. We might have to throw away the new method, | |
2351 // if a racing thread has managed to install one at the same time. | |
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2352 if (found_on_bcp) { |
710 | 2353 MutexLocker ml(SystemDictionary_lock, Thread::current()); |
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2354 spe = invoke_method_table()->find_entry(index, hash, signature, name_id); |
710 | 2355 if (spe == NULL) |
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2356 spe = invoke_method_table()->add_entry(index, hash, signature, name_id); |
710 | 2357 if (spe->property_oop() == NULL) |
2358 spe->set_property_oop(m()); | |
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2359 } else { |
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2360 non_cached_result = m; |
710 | 2361 } |
2362 } | |
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2363 if (spe != NULL && spe->property_oop() != NULL) { |
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2364 assert(spe->property_oop()->is_method(), ""); |
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2365 return (methodOop) spe->property_oop(); |
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|
2366 } else { |
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|
2367 return non_cached_result(); |
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|
2368 } |
710 | 2369 } |
2370 | |
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2371 // Ask Java code to find or construct a java.lang.invoke.MethodType for the given |
710 | 2372 // signature, as interpreted relative to the given class loader. |
2373 // Because of class loader constraints, all method handle usage must be | |
2374 // consistent with this loader. | |
2177
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2375 Handle SystemDictionary::find_method_handle_type(Symbol* signature, |
1508
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2376 KlassHandle accessing_klass, |
1793
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2377 bool for_invokeGeneric, |
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2378 bool& return_bcp_flag, |
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2379 TRAPS) { |
1508
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2380 Handle class_loader, protection_domain; |
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2381 bool is_on_bcp = true; // keep this true as long as we can materialize from the boot classloader |
710 | 2382 Handle empty; |
2177
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2383 int npts = ArgumentCount(signature).size(); |
1142 | 2384 objArrayHandle pts = oopFactory::new_objArray(SystemDictionary::Class_klass(), npts, CHECK_(empty)); |
710 | 2385 int arg = 0; |
2386 Handle rt; // the return type from the signature | |
2177
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2387 ResourceMark rm(THREAD); |
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2388 for (SignatureStream ss(signature); !ss.is_done(); ss.next()) { |
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2389 oop mirror = NULL; |
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2390 if (is_on_bcp) { |
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2391 mirror = ss.as_java_mirror(class_loader, protection_domain, |
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2392 SignatureStream::ReturnNull, CHECK_(empty)); |
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2393 if (mirror == NULL) { |
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2394 // fall back from BCP to accessing_klass |
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2395 if (accessing_klass.not_null()) { |
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2396 class_loader = Handle(THREAD, instanceKlass::cast(accessing_klass())->class_loader()); |
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2397 protection_domain = Handle(THREAD, instanceKlass::cast(accessing_klass())->protection_domain()); |
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2398 } |
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2399 is_on_bcp = false; |
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2400 } |
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2401 } |
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2402 if (!is_on_bcp) { |
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2403 // Resolve, throwing a real error if it doesn't work. |
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2404 mirror = ss.as_java_mirror(class_loader, protection_domain, |
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2405 SignatureStream::NCDFError, CHECK_(empty)); |
710 | 2406 } |
2407 if (ss.at_return_type()) | |
2408 rt = Handle(THREAD, mirror); | |
2409 else | |
2410 pts->obj_at_put(arg++, mirror); | |
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2411 // Check accessibility. |
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2412 if (ss.is_object() && accessing_klass.not_null()) { |
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2413 klassOop sel_klass = java_lang_Class::as_klassOop(mirror); |
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2414 // Emulate constantPoolOopDesc::verify_constant_pool_resolve. |
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2415 if (Klass::cast(sel_klass)->oop_is_objArray()) |
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2416 sel_klass = objArrayKlass::cast(sel_klass)->bottom_klass(); |
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2417 if (Klass::cast(sel_klass)->oop_is_instance()) { |
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2418 KlassHandle sel_kh(THREAD, sel_klass); |
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2419 LinkResolver::check_klass_accessability(accessing_klass, sel_kh, CHECK_(empty)); |
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2420 } |
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2421 } |
710 | 2422 } |
2423 assert(arg == npts, ""); | |
2424 | |
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2425 // call java.lang.invoke.MethodHandleNatives::findMethodType(Class rt, Class[] pts) -> MethodType |
710 | 2426 JavaCallArguments args(Handle(THREAD, rt())); |
2427 args.push_oop(pts()); | |
2428 JavaValue result(T_OBJECT); | |
2429 JavaCalls::call_static(&result, | |
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|
2430 SystemDictionary::MethodHandleNatives_klass(), |
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|
2431 vmSymbols::findMethodHandleType_name(), |
2460 | 2432 vmSymbols::findMethodHandleType_signature(), |
710 | 2433 &args, CHECK_(empty)); |
1793
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2434 Handle method_type(THREAD, (oop) result.get_jobject()); |
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2435 |
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|
2436 if (for_invokeGeneric) { |
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2437 // call java.lang.invoke.MethodHandleNatives::notifyGenericMethodType(MethodType) -> void |
1793
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|
2438 JavaCallArguments args(Handle(THREAD, method_type())); |
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|
2439 JavaValue no_result(T_VOID); |
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|
2440 JavaCalls::call_static(&no_result, |
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|
2441 SystemDictionary::MethodHandleNatives_klass(), |
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|
2442 vmSymbols::notifyGenericMethodType_name(), |
2460 | 2443 vmSymbols::notifyGenericMethodType_signature(), |
1793
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diff
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|
2444 &args, THREAD); |
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|
2445 if (HAS_PENDING_EXCEPTION) { |
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|
2446 // If the notification fails, just kill it. |
d257356e35f0
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|
2447 CLEAR_PENDING_EXCEPTION; |
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|
2448 } |
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|
2449 } |
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|
2450 |
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|
2451 // report back to the caller with the MethodType and the "on_bcp" flag |
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|
2452 return_bcp_flag = is_on_bcp; |
1793
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|
2453 return method_type; |
710 | 2454 } |
2455 | |
1602 | 2456 // Ask Java code to find or construct a method handle constant. |
2457 Handle SystemDictionary::link_method_handle_constant(KlassHandle caller, | |
2458 int ref_kind, //e.g., JVM_REF_invokeVirtual | |
2459 KlassHandle callee, | |
2177
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|
2460 Symbol* name_sym, |
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|
2461 Symbol* signature, |
1602 | 2462 TRAPS) { |
2463 Handle empty; | |
2177
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|
2464 Handle name = java_lang_String::create_from_symbol(name_sym, CHECK_(empty)); |
1602 | 2465 Handle type; |
2466 if (signature->utf8_length() > 0 && signature->byte_at(0) == '(') { | |
2467 bool ignore_is_on_bcp = false; | |
1793
d257356e35f0
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|
2468 type = find_method_handle_type(signature, caller, false, ignore_is_on_bcp, CHECK_(empty)); |
1602 | 2469 } else { |
2177
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|
2470 ResourceMark rm(THREAD); |
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diff
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|
2471 SignatureStream ss(signature, false); |
1602 | 2472 if (!ss.is_done()) { |
2473 oop mirror = ss.as_java_mirror(caller->class_loader(), caller->protection_domain(), | |
2474 SignatureStream::NCDFError, CHECK_(empty)); | |
2475 type = Handle(THREAD, mirror); | |
2476 ss.next(); | |
2477 if (!ss.is_done()) type = Handle(); // error! | |
2478 } | |
2479 } | |
2480 if (type.is_null()) { | |
2481 THROW_MSG_(vmSymbols::java_lang_LinkageError(), "bad signature", empty); | |
2482 } | |
2483 | |
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|
2484 // call java.lang.invoke.MethodHandleNatives::linkMethodHandleConstant(Class caller, int refKind, Class callee, String name, Object type) -> MethodHandle |
1602 | 2485 JavaCallArguments args; |
2486 args.push_oop(caller->java_mirror()); // the referring class | |
2487 args.push_int(ref_kind); | |
2488 args.push_oop(callee->java_mirror()); // the target class | |
2489 args.push_oop(name()); | |
2490 args.push_oop(type()); | |
2491 JavaValue result(T_OBJECT); | |
2492 JavaCalls::call_static(&result, | |
2493 SystemDictionary::MethodHandleNatives_klass(), | |
2494 vmSymbols::linkMethodHandleConstant_name(), | |
2460 | 2495 vmSymbols::linkMethodHandleConstant_signature(), |
1602 | 2496 &args, CHECK_(empty)); |
2497 return Handle(THREAD, (oop) result.get_jobject()); | |
2498 } | |
710 | 2499 |
2357
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|
2500 // Ask Java code to find or construct a java.lang.invoke.CallSite for the given |
726
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diff
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|
2501 // name and signature, as interpreted relative to the given class loader. |
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|
2502 Handle SystemDictionary::make_dynamic_call_site(Handle bootstrap_method, |
2177
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diff
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|
2503 Symbol* name, |
1507
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diff
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|
2504 methodHandle signature_invoker, |
cd5dbf694d45
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diff
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|
2505 Handle info, |
cd5dbf694d45
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|
2506 methodHandle caller_method, |
726
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710
diff
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|
2507 int caller_bci, |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
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diff
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|
2508 TRAPS) { |
be93aad57795
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diff
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|
2509 Handle empty; |
1660
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
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1602
diff
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|
2510 guarantee(bootstrap_method.not_null() && |
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|
2511 java_lang_invoke_MethodHandle::is_instance(bootstrap_method()), |
1660
083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
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|
2512 "caller must supply a valid BSM"); |
083fde3b838e
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1602
diff
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|
2513 |
1507
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|
2514 Handle caller_mname = MethodHandles::new_MemberName(CHECK_(empty)); |
cd5dbf694d45
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|
2515 MethodHandles::init_MemberName(caller_mname(), caller_method()); |
cd5dbf694d45
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|
2516 |
2357
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|
2517 // call java.lang.invoke.MethodHandleNatives::makeDynamicCallSite(bootm, name, mtype, info, caller_mname, caller_pos) |
2177
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|
2518 oop name_str_oop = StringTable::intern(name, CHECK_(empty)); // not a handle! |
1507
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|
2519 JavaCallArguments args(Handle(THREAD, bootstrap_method())); |
726
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|
2520 args.push_oop(name_str_oop); |
1507
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|
2521 args.push_oop(signature_invoker->method_handle_type()); |
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|
2522 args.push_oop(info()); |
cd5dbf694d45
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|
2523 args.push_oop(caller_mname()); |
726
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|
2524 args.push_int(caller_bci); |
be93aad57795
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|
2525 JavaValue result(T_OBJECT); |
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diff
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|
2526 JavaCalls::call_static(&result, |
1507
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|
2527 SystemDictionary::MethodHandleNatives_klass(), |
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|
2528 vmSymbols::makeDynamicCallSite_name(), |
2460 | 2529 vmSymbols::makeDynamicCallSite_signature(), |
726
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diff
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|
2530 &args, CHECK_(empty)); |
be93aad57795
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jrose
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diff
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|
2531 oop call_site_oop = (oop) result.get_jobject(); |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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875
diff
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|
2532 assert(call_site_oop->is_oop() |
2357
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|
2533 /*&& java_lang_invoke_CallSite::is_instance(call_site_oop)*/, "must be sane"); |
726
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|
2534 if (TraceMethodHandles) { |
1059
389049f3f393
6858164: invokedynamic code needs some cleanup (post-6655638)
jrose
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1039
diff
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|
2535 #ifndef PRODUCT |
726
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diff
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|
2536 tty->print_cr("Linked invokedynamic bci=%d site="INTPTR_FORMAT":", caller_bci, call_site_oop); |
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diff
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|
2537 call_site_oop->print(); |
be93aad57795
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jrose
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diff
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|
2538 tty->cr(); |
1059
389049f3f393
6858164: invokedynamic code needs some cleanup (post-6655638)
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|
2539 #endif //PRODUCT |
726
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2540 } |
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|
2541 return call_site_oop; |
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diff
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|
2542 } |
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|
2543 |
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2544 Handle SystemDictionary::find_bootstrap_method(methodHandle caller_method, int caller_bci, |
1913
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2545 int cache_index, |
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|
2546 Handle& argument_info_result, |
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|
2547 TRAPS) { |
726
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|
2548 Handle empty; |
1660
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|
2549 |
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|
2550 constantPoolHandle pool; |
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|
2551 { |
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|
2552 klassOop caller = caller_method->method_holder(); |
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2553 if (!Klass::cast(caller)->oop_is_instance()) return empty; |
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2554 pool = constantPoolHandle(THREAD, instanceKlass::cast(caller)->constants()); |
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|
2555 } |
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|
2556 |
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2557 int constant_pool_index = pool->cache()->entry_at(cache_index)->constant_pool_index(); |
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2558 constantTag tag = pool->tag_at(constant_pool_index); |
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2559 |
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2560 if (tag.is_invoke_dynamic()) { |
1913
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2561 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments |
1660
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2562 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry. |
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2563 int bsm_index = pool->invoke_dynamic_bootstrap_method_ref_index_at(constant_pool_index); |
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2564 if (bsm_index != 0) { |
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2565 int bsm_index_in_cache = pool->cache()->entry_at(cache_index)->bootstrap_method_index_in_cache(); |
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2566 DEBUG_ONLY(int bsm_index_2 = pool->cache()->entry_at(bsm_index_in_cache)->constant_pool_index()); |
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2567 assert(bsm_index == bsm_index_2, "BSM constant lifted to cache"); |
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2568 if (TraceMethodHandles) { |
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2569 tty->print_cr("resolving bootstrap method for "PTR_FORMAT" at %d at cache[%d]CP[%d]...", |
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2570 (intptr_t) caller_method(), caller_bci, cache_index, constant_pool_index); |
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2571 } |
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|
2572 oop bsm_oop = pool->resolve_cached_constant_at(bsm_index_in_cache, CHECK_(empty)); |
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2573 if (TraceMethodHandles) { |
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|
2574 tty->print_cr("bootstrap method for "PTR_FORMAT" at %d retrieved as "PTR_FORMAT":", |
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|
2575 (intptr_t) caller_method(), caller_bci, (intptr_t) bsm_oop); |
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|
2576 } |
1913
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|
2577 assert(bsm_oop->is_oop(), "must be sane"); |
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|
2578 // caller must verify that it is of type MethodHandle |
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|
2579 Handle bsm(THREAD, bsm_oop); |
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|
2580 bsm_oop = NULL; // safety |
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|
2581 |
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|
2582 // Extract the optional static arguments. |
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|
2583 Handle argument_info; // either null, or one arg, or Object[]{arg...} |
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|
2584 int argc = pool->invoke_dynamic_argument_count_at(constant_pool_index); |
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|
2585 if (TraceInvokeDynamic) { |
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|
2586 tty->print_cr("find_bootstrap_method: [%d/%d] CONSTANT_InvokeDynamic: %d[%d]", |
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|
2587 constant_pool_index, cache_index, bsm_index, argc); |
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|
2588 } |
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|
2589 if (argc > 0) { |
3b2dea75431e
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diff
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|
2590 objArrayHandle arg_array; |
3b2dea75431e
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|
2591 if (argc > 1) { |
3b2dea75431e
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|
2592 objArrayOop arg_array_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), argc, CHECK_(empty)); |
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|
2593 arg_array = objArrayHandle(THREAD, arg_array_oop); |
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diff
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|
2594 argument_info = arg_array; |
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diff
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|
2595 } |
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|
2596 for (int arg_i = 0; arg_i < argc; arg_i++) { |
3b2dea75431e
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diff
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|
2597 int arg_index = pool->invoke_dynamic_argument_index_at(constant_pool_index, arg_i); |
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|
2598 oop arg_oop = pool->resolve_possibly_cached_constant_at(arg_index, CHECK_(empty)); |
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|
2599 if (arg_array.is_null()) { |
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diff
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|
2600 argument_info = Handle(THREAD, arg_oop); |
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diff
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|
2601 } else { |
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diff
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|
2602 arg_array->obj_at_put(arg_i, arg_oop); |
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diff
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|
2603 } |
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|
2604 } |
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|
2605 } |
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|
2606 |
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diff
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|
2607 argument_info_result = argument_info; // return argument_info to caller |
3b2dea75431e
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diff
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|
2608 return bsm; |
1660
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diff
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|
2609 } |
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diff
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|
2610 } else { |
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diff
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|
2611 ShouldNotReachHere(); // verifier does not allow this |
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6964498: JSR 292 invokedynamic sites need local bootstrap methods
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diff
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|
2612 } |
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diff
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|
2613 |
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
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1339
diff
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|
2614 return empty; |
726
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6655646: dynamic languages need dynamically linked call sites
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diff
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|
2615 } |
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|
2616 |
0 | 2617 // Since the identity hash code for symbols changes when the symbols are |
2618 // moved from the regular perm gen (hash in the mark word) to the shared | |
2619 // spaces (hash is the address), the classes loaded into the dictionary | |
2620 // may be in the wrong buckets. | |
2621 | |
2622 void SystemDictionary::reorder_dictionary() { | |
2623 dictionary()->reorder_dictionary(); | |
2624 } | |
2625 | |
2626 | |
2627 void SystemDictionary::copy_buckets(char** top, char* end) { | |
2628 dictionary()->copy_buckets(top, end); | |
2629 } | |
2630 | |
2631 | |
2632 void SystemDictionary::copy_table(char** top, char* end) { | |
2633 dictionary()->copy_table(top, end); | |
2634 } | |
2635 | |
2636 | |
2637 void SystemDictionary::reverse() { | |
2638 dictionary()->reverse(); | |
2639 } | |
2640 | |
2641 int SystemDictionary::number_of_classes() { | |
2642 return dictionary()->number_of_entries(); | |
2643 } | |
2644 | |
2645 | |
2646 // ---------------------------------------------------------------------------- | |
2647 #ifndef PRODUCT | |
2648 | |
2649 void SystemDictionary::print() { | |
2650 dictionary()->print(); | |
2651 | |
2652 // Placeholders | |
2653 GCMutexLocker mu(SystemDictionary_lock); | |
2654 placeholders()->print(); | |
2655 | |
2656 // loader constraints - print under SD_lock | |
2657 constraints()->print(); | |
2658 } | |
2659 | |
2660 #endif | |
2661 | |
2662 void SystemDictionary::verify() { | |
2663 guarantee(dictionary() != NULL, "Verify of system dictionary failed"); | |
2664 guarantee(constraints() != NULL, | |
2665 "Verify of loader constraints failed"); | |
2666 guarantee(dictionary()->number_of_entries() >= 0 && | |
2667 placeholders()->number_of_entries() >= 0, | |
2668 "Verify of system dictionary failed"); | |
2669 | |
2670 // Verify dictionary | |
2671 dictionary()->verify(); | |
2672 | |
2673 GCMutexLocker mu(SystemDictionary_lock); | |
2674 placeholders()->verify(); | |
2675 | |
2676 // Verify constraint table | |
2677 guarantee(constraints() != NULL, "Verify of loader constraints failed"); | |
1258
38836cf1d8d2
6920977: G1: guarantee(k == probe->klass(),"klass should be in dictionary") fails
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1142
diff
changeset
|
2678 constraints()->verify(dictionary(), placeholders()); |
0 | 2679 } |
2680 | |
2681 | |
2682 void SystemDictionary::verify_obj_klass_present(Handle obj, | |
2177
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coleenp
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2001
diff
changeset
|
2683 Symbol* class_name, |
0 | 2684 Handle class_loader) { |
2685 GCMutexLocker mu(SystemDictionary_lock); | |
2177
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2001
diff
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|
2686 Symbol* name; |
3582bf76420e
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2001
diff
changeset
|
2687 |
3582bf76420e
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2001
diff
changeset
|
2688 klassOop probe = find_class(class_name, class_loader); |
0 | 2689 if (probe == NULL) { |
2690 probe = SystemDictionary::find_shared_class(class_name); | |
2177
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2001
diff
changeset
|
2691 if (probe == NULL) { |
3582bf76420e
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2001
diff
changeset
|
2692 name = find_placeholder(class_name, class_loader); |
3582bf76420e
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coleenp
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diff
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|
2693 } |
0 | 2694 } |
2177
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diff
changeset
|
2695 guarantee(probe != NULL || name != NULL, |
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diff
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|
2696 "Loaded klasses should be in SystemDictionary"); |
0 | 2697 } |
2698 | |
2699 #ifndef PRODUCT | |
2700 | |
2701 // statistics code | |
2702 class ClassStatistics: AllStatic { | |
2703 private: | |
2704 static int nclasses; // number of classes | |
2705 static int nmethods; // number of methods | |
2706 static int nmethoddata; // number of methodData | |
2707 static int class_size; // size of class objects in words | |
2708 static int method_size; // size of method objects in words | |
2709 static int debug_size; // size of debug info in methods | |
2710 static int methoddata_size; // size of methodData objects in words | |
2711 | |
2712 static void do_class(klassOop k) { | |
2713 nclasses++; | |
2714 class_size += k->size(); | |
2715 if (k->klass_part()->oop_is_instance()) { | |
2716 instanceKlass* ik = (instanceKlass*)k->klass_part(); | |
2717 class_size += ik->methods()->size(); | |
2718 class_size += ik->constants()->size(); | |
2719 class_size += ik->local_interfaces()->size(); | |
2720 class_size += ik->transitive_interfaces()->size(); | |
2721 // We do not have to count implementors, since we only store one! | |
2722 class_size += ik->fields()->size(); | |
2723 } | |
2724 } | |
2725 | |
2726 static void do_method(methodOop m) { | |
2727 nmethods++; | |
2728 method_size += m->size(); | |
2729 // class loader uses same objArray for empty vectors, so don't count these | |
2730 if (m->exception_table()->length() != 0) method_size += m->exception_table()->size(); | |
2731 if (m->has_stackmap_table()) { | |
2732 method_size += m->stackmap_data()->size(); | |
2733 } | |
2734 | |
2735 methodDataOop mdo = m->method_data(); | |
2736 if (mdo != NULL) { | |
2737 nmethoddata++; | |
2738 methoddata_size += mdo->size(); | |
2739 } | |
2740 } | |
2741 | |
2742 public: | |
2743 static void print() { | |
2744 SystemDictionary::classes_do(do_class); | |
2745 SystemDictionary::methods_do(do_method); | |
2746 tty->print_cr("Class statistics:"); | |
2747 tty->print_cr("%d classes (%d bytes)", nclasses, class_size * oopSize); | |
2748 tty->print_cr("%d methods (%d bytes = %d base + %d debug info)", nmethods, | |
2749 (method_size + debug_size) * oopSize, method_size * oopSize, debug_size * oopSize); | |
2750 tty->print_cr("%d methoddata (%d bytes)", nmethoddata, methoddata_size * oopSize); | |
2751 } | |
2752 }; | |
2753 | |
2754 | |
2755 int ClassStatistics::nclasses = 0; | |
2756 int ClassStatistics::nmethods = 0; | |
2757 int ClassStatistics::nmethoddata = 0; | |
2758 int ClassStatistics::class_size = 0; | |
2759 int ClassStatistics::method_size = 0; | |
2760 int ClassStatistics::debug_size = 0; | |
2761 int ClassStatistics::methoddata_size = 0; | |
2762 | |
2763 void SystemDictionary::print_class_statistics() { | |
2764 ResourceMark rm; | |
2765 ClassStatistics::print(); | |
2766 } | |
2767 | |
2768 | |
2769 class MethodStatistics: AllStatic { | |
2770 public: | |
2771 enum { | |
2772 max_parameter_size = 10 | |
2773 }; | |
2774 private: | |
2775 | |
2776 static int _number_of_methods; | |
2777 static int _number_of_final_methods; | |
2778 static int _number_of_static_methods; | |
2779 static int _number_of_native_methods; | |
2780 static int _number_of_synchronized_methods; | |
2781 static int _number_of_profiled_methods; | |
2782 static int _number_of_bytecodes; | |
2783 static int _parameter_size_profile[max_parameter_size]; | |
2784 static int _bytecodes_profile[Bytecodes::number_of_java_codes]; | |
2785 | |
2786 static void initialize() { | |
2787 _number_of_methods = 0; | |
2788 _number_of_final_methods = 0; | |
2789 _number_of_static_methods = 0; | |
2790 _number_of_native_methods = 0; | |
2791 _number_of_synchronized_methods = 0; | |
2792 _number_of_profiled_methods = 0; | |
2793 _number_of_bytecodes = 0; | |
2794 for (int i = 0; i < max_parameter_size ; i++) _parameter_size_profile[i] = 0; | |
2795 for (int j = 0; j < Bytecodes::number_of_java_codes; j++) _bytecodes_profile [j] = 0; | |
2796 }; | |
2797 | |
2798 static void do_method(methodOop m) { | |
2799 _number_of_methods++; | |
2800 // collect flag info | |
2801 if (m->is_final() ) _number_of_final_methods++; | |
2802 if (m->is_static() ) _number_of_static_methods++; | |
2803 if (m->is_native() ) _number_of_native_methods++; | |
2804 if (m->is_synchronized()) _number_of_synchronized_methods++; | |
2805 if (m->method_data() != NULL) _number_of_profiled_methods++; | |
2806 // collect parameter size info (add one for receiver, if any) | |
2807 _parameter_size_profile[MIN2(m->size_of_parameters() + (m->is_static() ? 0 : 1), max_parameter_size - 1)]++; | |
2808 // collect bytecodes info | |
2809 { | |
2810 Thread *thread = Thread::current(); | |
2811 HandleMark hm(thread); | |
2812 BytecodeStream s(methodHandle(thread, m)); | |
2813 Bytecodes::Code c; | |
2814 while ((c = s.next()) >= 0) { | |
2815 _number_of_bytecodes++; | |
2816 _bytecodes_profile[c]++; | |
2817 } | |
2818 } | |
2819 } | |
2820 | |
2821 public: | |
2822 static void print() { | |
2823 initialize(); | |
2824 SystemDictionary::methods_do(do_method); | |
2825 // generate output | |
2826 tty->cr(); | |
2827 tty->print_cr("Method statistics (static):"); | |
2828 // flag distribution | |
2829 tty->cr(); | |
2830 tty->print_cr("%6d final methods %6.1f%%", _number_of_final_methods , _number_of_final_methods * 100.0F / _number_of_methods); | |
2831 tty->print_cr("%6d static methods %6.1f%%", _number_of_static_methods , _number_of_static_methods * 100.0F / _number_of_methods); | |
2832 tty->print_cr("%6d native methods %6.1f%%", _number_of_native_methods , _number_of_native_methods * 100.0F / _number_of_methods); | |
2833 tty->print_cr("%6d synchronized methods %6.1f%%", _number_of_synchronized_methods, _number_of_synchronized_methods * 100.0F / _number_of_methods); | |
2834 tty->print_cr("%6d profiled methods %6.1f%%", _number_of_profiled_methods, _number_of_profiled_methods * 100.0F / _number_of_methods); | |
2835 // parameter size profile | |
2836 tty->cr(); | |
2837 { int tot = 0; | |
2838 int avg = 0; | |
2839 for (int i = 0; i < max_parameter_size; i++) { | |
2840 int n = _parameter_size_profile[i]; | |
2841 tot += n; | |
2842 avg += n*i; | |
2843 tty->print_cr("parameter size = %1d: %6d methods %5.1f%%", i, n, n * 100.0F / _number_of_methods); | |
2844 } | |
2845 assert(tot == _number_of_methods, "should be the same"); | |
2846 tty->print_cr(" %6d methods 100.0%%", _number_of_methods); | |
2847 tty->print_cr("(average parameter size = %3.1f including receiver, if any)", (float)avg / _number_of_methods); | |
2848 } | |
2849 // bytecodes profile | |
2850 tty->cr(); | |
2851 { int tot = 0; | |
2852 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) { | |
2853 if (Bytecodes::is_defined(i)) { | |
2854 Bytecodes::Code c = Bytecodes::cast(i); | |
2855 int n = _bytecodes_profile[c]; | |
2856 tot += n; | |
2857 tty->print_cr("%9d %7.3f%% %s", n, n * 100.0F / _number_of_bytecodes, Bytecodes::name(c)); | |
2858 } | |
2859 } | |
2860 assert(tot == _number_of_bytecodes, "should be the same"); | |
2861 tty->print_cr("%9d 100.000%%", _number_of_bytecodes); | |
2862 } | |
2863 tty->cr(); | |
2864 } | |
2865 }; | |
2866 | |
2867 int MethodStatistics::_number_of_methods; | |
2868 int MethodStatistics::_number_of_final_methods; | |
2869 int MethodStatistics::_number_of_static_methods; | |
2870 int MethodStatistics::_number_of_native_methods; | |
2871 int MethodStatistics::_number_of_synchronized_methods; | |
2872 int MethodStatistics::_number_of_profiled_methods; | |
2873 int MethodStatistics::_number_of_bytecodes; | |
2874 int MethodStatistics::_parameter_size_profile[MethodStatistics::max_parameter_size]; | |
2875 int MethodStatistics::_bytecodes_profile[Bytecodes::number_of_java_codes]; | |
2876 | |
2877 | |
2878 void SystemDictionary::print_method_statistics() { | |
2879 MethodStatistics::print(); | |
2880 } | |
2881 | |
2882 #endif // PRODUCT |