Mercurial > hg > truffle
annotate src/share/vm/classfile/systemDictionary.cpp @ 139:c0492d52d55b
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
Reviewed-by: ysr, jmasa
author | apetrusenko |
---|---|
date | Tue, 01 Apr 2008 15:13:47 +0400 |
parents | 90f5ddc7297b |
children | 60b728ec77c1 |
rev | line source |
---|---|
0 | 1 /* |
2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved. | |
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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_systemDictionary.cpp.incl" | |
27 | |
28 | |
29 Dictionary* SystemDictionary::_dictionary = NULL; | |
30 PlaceholderTable* SystemDictionary::_placeholders = NULL; | |
31 Dictionary* SystemDictionary::_shared_dictionary = NULL; | |
32 LoaderConstraintTable* SystemDictionary::_loader_constraints = NULL; | |
33 ResolutionErrorTable* SystemDictionary::_resolution_errors = NULL; | |
34 | |
35 | |
36 int SystemDictionary::_number_of_modifications = 0; | |
37 | |
38 oop SystemDictionary::_system_loader_lock_obj = NULL; | |
39 | |
40 klassOop SystemDictionary::_object_klass = NULL; | |
41 klassOop SystemDictionary::_string_klass = NULL; | |
42 klassOop SystemDictionary::_class_klass = NULL; | |
43 klassOop SystemDictionary::_cloneable_klass = NULL; | |
44 klassOop SystemDictionary::_classloader_klass = NULL; | |
45 klassOop SystemDictionary::_serializable_klass = NULL; | |
46 klassOop SystemDictionary::_system_klass = NULL; | |
47 | |
48 klassOop SystemDictionary::_throwable_klass = NULL; | |
49 klassOop SystemDictionary::_error_klass = NULL; | |
50 klassOop SystemDictionary::_threaddeath_klass = NULL; | |
51 klassOop SystemDictionary::_exception_klass = NULL; | |
52 klassOop SystemDictionary::_runtime_exception_klass = NULL; | |
53 klassOop SystemDictionary::_classNotFoundException_klass = NULL; | |
54 klassOop SystemDictionary::_noClassDefFoundError_klass = NULL; | |
55 klassOop SystemDictionary::_linkageError_klass = NULL; | |
56 klassOop SystemDictionary::_classCastException_klass = NULL; | |
57 klassOop SystemDictionary::_arrayStoreException_klass = NULL; | |
58 klassOop SystemDictionary::_virtualMachineError_klass = NULL; | |
59 klassOop SystemDictionary::_outOfMemoryError_klass = NULL; | |
60 klassOop SystemDictionary::_StackOverflowError_klass = NULL; | |
61 klassOop SystemDictionary::_illegalMonitorStateException_klass = NULL; | |
62 klassOop SystemDictionary::_protectionDomain_klass = NULL; | |
63 klassOop SystemDictionary::_AccessControlContext_klass = NULL; | |
64 | |
65 klassOop SystemDictionary::_reference_klass = NULL; | |
66 klassOop SystemDictionary::_soft_reference_klass = NULL; | |
67 klassOop SystemDictionary::_weak_reference_klass = NULL; | |
68 klassOop SystemDictionary::_final_reference_klass = NULL; | |
69 klassOop SystemDictionary::_phantom_reference_klass = NULL; | |
70 klassOop SystemDictionary::_finalizer_klass = NULL; | |
71 | |
72 klassOop SystemDictionary::_thread_klass = NULL; | |
73 klassOop SystemDictionary::_threadGroup_klass = NULL; | |
74 klassOop SystemDictionary::_properties_klass = NULL; | |
75 klassOop SystemDictionary::_reflect_accessible_object_klass = NULL; | |
76 klassOop SystemDictionary::_reflect_field_klass = NULL; | |
77 klassOop SystemDictionary::_reflect_method_klass = NULL; | |
78 klassOop SystemDictionary::_reflect_constructor_klass = NULL; | |
79 klassOop SystemDictionary::_reflect_magic_klass = NULL; | |
80 klassOop SystemDictionary::_reflect_method_accessor_klass = NULL; | |
81 klassOop SystemDictionary::_reflect_constructor_accessor_klass = NULL; | |
82 klassOop SystemDictionary::_reflect_delegating_classloader_klass = NULL; | |
83 klassOop SystemDictionary::_reflect_constant_pool_klass = NULL; | |
84 klassOop SystemDictionary::_reflect_unsafe_static_field_accessor_impl_klass = NULL; | |
85 | |
86 klassOop SystemDictionary::_vector_klass = NULL; | |
87 klassOop SystemDictionary::_hashtable_klass = NULL; | |
88 klassOop SystemDictionary::_stringBuffer_klass = NULL; | |
89 | |
90 klassOop SystemDictionary::_stackTraceElement_klass = NULL; | |
91 | |
92 klassOop SystemDictionary::_java_nio_Buffer_klass = NULL; | |
93 | |
94 klassOop SystemDictionary::_sun_misc_AtomicLongCSImpl_klass = NULL; | |
95 klassOop SystemDictionary::_sun_jkernel_DownloadManager_klass = NULL; | |
96 | |
97 klassOop SystemDictionary::_boolean_klass = NULL; | |
98 klassOop SystemDictionary::_char_klass = NULL; | |
99 klassOop SystemDictionary::_float_klass = NULL; | |
100 klassOop SystemDictionary::_double_klass = NULL; | |
101 klassOop SystemDictionary::_byte_klass = NULL; | |
102 klassOop SystemDictionary::_short_klass = NULL; | |
103 klassOop SystemDictionary::_int_klass = NULL; | |
104 klassOop SystemDictionary::_long_klass = NULL; | |
105 klassOop SystemDictionary::_box_klasses[T_VOID+1] = { NULL /*, NULL...*/ }; | |
106 | |
107 oop SystemDictionary::_java_system_loader = NULL; | |
108 | |
109 bool SystemDictionary::_has_loadClassInternal = false; | |
110 bool SystemDictionary::_has_checkPackageAccess = false; | |
111 | |
112 // lazily initialized klass variables | |
113 volatile klassOop SystemDictionary::_abstract_ownable_synchronizer_klass = NULL; | |
114 | |
115 | |
116 // ---------------------------------------------------------------------------- | |
117 // Java-level SystemLoader | |
118 | |
119 oop SystemDictionary::java_system_loader() { | |
120 return _java_system_loader; | |
121 } | |
122 | |
123 void SystemDictionary::compute_java_system_loader(TRAPS) { | |
124 KlassHandle system_klass(THREAD, _classloader_klass); | |
125 JavaValue result(T_OBJECT); | |
126 JavaCalls::call_static(&result, | |
127 KlassHandle(THREAD, _classloader_klass), | |
128 vmSymbolHandles::getSystemClassLoader_name(), | |
129 vmSymbolHandles::void_classloader_signature(), | |
130 CHECK); | |
131 | |
132 _java_system_loader = (oop)result.get_jobject(); | |
133 } | |
134 | |
135 | |
136 // ---------------------------------------------------------------------------- | |
137 // debugging | |
138 | |
139 #ifdef ASSERT | |
140 | |
141 // return true if class_name contains no '.' (internal format is '/') | |
142 bool SystemDictionary::is_internal_format(symbolHandle class_name) { | |
143 if (class_name.not_null()) { | |
144 ResourceMark rm; | |
145 char* name = class_name->as_C_string(); | |
146 return strchr(name, '.') == NULL; | |
147 } else { | |
148 return true; | |
149 } | |
150 } | |
151 | |
152 #endif | |
153 | |
154 // ---------------------------------------------------------------------------- | |
155 // Resolving of classes | |
156 | |
157 // Forwards to resolve_or_null | |
158 | |
159 klassOop SystemDictionary::resolve_or_fail(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS) { | |
160 klassOop klass = resolve_or_null(class_name, class_loader, protection_domain, THREAD); | |
161 if (HAS_PENDING_EXCEPTION || klass == NULL) { | |
162 KlassHandle k_h(THREAD, klass); | |
163 // can return a null klass | |
164 klass = handle_resolution_exception(class_name, class_loader, protection_domain, throw_error, k_h, THREAD); | |
165 } | |
166 return klass; | |
167 } | |
168 | |
169 klassOop SystemDictionary::handle_resolution_exception(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS) { | |
170 if (HAS_PENDING_EXCEPTION) { | |
171 // If we have a pending exception we forward it to the caller, unless throw_error is true, | |
172 // in which case we have to check whether the pending exception is a ClassNotFoundException, | |
173 // and if so convert it to a NoClassDefFoundError | |
174 // And chain the original ClassNotFoundException | |
175 if (throw_error && PENDING_EXCEPTION->is_a(SystemDictionary::classNotFoundException_klass())) { | |
176 ResourceMark rm(THREAD); | |
177 assert(klass_h() == NULL, "Should not have result with exception pending"); | |
178 Handle e(THREAD, PENDING_EXCEPTION); | |
179 CLEAR_PENDING_EXCEPTION; | |
180 THROW_MSG_CAUSE_0(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string(), e); | |
181 } else { | |
182 return NULL; | |
183 } | |
184 } | |
185 // Class not found, throw appropriate error or exception depending on value of throw_error | |
186 if (klass_h() == NULL) { | |
187 ResourceMark rm(THREAD); | |
188 if (throw_error) { | |
189 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string()); | |
190 } else { | |
191 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), class_name->as_C_string()); | |
192 } | |
193 } | |
194 return (klassOop)klass_h(); | |
195 } | |
196 | |
197 | |
198 klassOop SystemDictionary::resolve_or_fail(symbolHandle class_name, | |
199 bool throw_error, TRAPS) | |
200 { | |
201 return resolve_or_fail(class_name, Handle(), Handle(), throw_error, THREAD); | |
202 } | |
203 | |
204 | |
205 // Forwards to resolve_instance_class_or_null | |
206 | |
207 klassOop SystemDictionary::resolve_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS) { | |
208 assert(!THREAD->is_Compiler_thread(), "Can not load classes with the Compiler thread"); | |
209 if (FieldType::is_array(class_name())) { | |
210 return resolve_array_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); | |
211 } else { | |
212 return resolve_instance_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL); | |
213 } | |
214 } | |
215 | |
216 klassOop SystemDictionary::resolve_or_null(symbolHandle class_name, TRAPS) { | |
217 return resolve_or_null(class_name, Handle(), Handle(), THREAD); | |
218 } | |
219 | |
220 // Forwards to resolve_instance_class_or_null | |
221 | |
222 klassOop SystemDictionary::resolve_array_class_or_null(symbolHandle class_name, | |
223 Handle class_loader, | |
224 Handle protection_domain, | |
225 TRAPS) { | |
226 assert(FieldType::is_array(class_name()), "must be array"); | |
227 jint dimension; | |
228 symbolOop object_key; | |
229 klassOop k = NULL; | |
230 // dimension and object_key are assigned as a side-effect of this call | |
231 BasicType t = FieldType::get_array_info(class_name(), | |
232 &dimension, | |
233 &object_key, | |
234 CHECK_NULL); | |
235 | |
236 if (t == T_OBJECT) { | |
237 symbolHandle h_key(THREAD, object_key); | |
238 // naked oop "k" is OK here -- we assign back into it | |
239 k = SystemDictionary::resolve_instance_class_or_null(h_key, | |
240 class_loader, | |
241 protection_domain, | |
242 CHECK_NULL); | |
243 if (k != NULL) { | |
244 k = Klass::cast(k)->array_klass(dimension, CHECK_NULL); | |
245 } | |
246 } else { | |
247 k = Universe::typeArrayKlassObj(t); | |
248 k = typeArrayKlass::cast(k)->array_klass(dimension, CHECK_NULL); | |
249 } | |
250 return k; | |
251 } | |
252 | |
253 | |
254 // Must be called for any super-class or super-interface resolution | |
255 // during class definition to allow class circularity checking | |
256 // super-interface callers: | |
257 // parse_interfaces - for defineClass & jvmtiRedefineClasses | |
258 // super-class callers: | |
259 // ClassFileParser - for defineClass & jvmtiRedefineClasses | |
260 // load_shared_class - while loading a class from shared archive | |
261 // resolve_instance_class_or_fail: | |
262 // when resolving a class that has an existing placeholder with | |
263 // a saved superclass [i.e. a defineClass is currently in progress] | |
264 // if another thread is trying to resolve the class, it must do | |
265 // super-class checks on its own thread to catch class circularity | |
266 // This last call is critical in class circularity checking for cases | |
267 // where classloading is delegated to different threads and the | |
268 // classloader lock is released. | |
269 // Take the case: Base->Super->Base | |
270 // 1. If thread T1 tries to do a defineClass of class Base | |
271 // resolve_super_or_fail creates placeholder: T1, Base (super Super) | |
272 // 2. resolve_instance_class_or_null does not find SD or placeholder for Super | |
273 // so it tries to load Super | |
274 // 3. If we load the class internally, or user classloader uses same thread | |
275 // loadClassFromxxx or defineClass via parseClassFile Super ... | |
276 // 3.1 resolve_super_or_fail creates placeholder: T1, Super (super Base) | |
277 // 3.3 resolve_instance_class_or_null Base, finds placeholder for Base | |
278 // 3.4 calls resolve_super_or_fail Base | |
279 // 3.5 finds T1,Base -> throws class circularity | |
280 //OR 4. If T2 tries to resolve Super via defineClass Super ... | |
281 // 4.1 resolve_super_or_fail creates placeholder: T2, Super (super Base) | |
282 // 4.2 resolve_instance_class_or_null Base, finds placeholder for Base (super Super) | |
283 // 4.3 calls resolve_super_or_fail Super in parallel on own thread T2 | |
284 // 4.4 finds T2, Super -> throws class circularity | |
285 // Must be called, even if superclass is null, since this is | |
286 // where the placeholder entry is created which claims this | |
287 // thread is loading this class/classloader. | |
288 klassOop SystemDictionary::resolve_super_or_fail(symbolHandle child_name, | |
289 symbolHandle class_name, | |
290 Handle class_loader, | |
291 Handle protection_domain, | |
292 bool is_superclass, | |
293 TRAPS) { | |
294 | |
295 // Double-check, if child class is already loaded, just return super-class,interface | |
296 // Don't add a placedholder if already loaded, i.e. already in system dictionary | |
297 // Make sure there's a placeholder for the *child* before resolving. | |
298 // Used as a claim that this thread is currently loading superclass/classloader | |
299 // Used here for ClassCircularity checks and also for heap verification | |
300 // (every instanceKlass in the heap needs to be in the system dictionary | |
301 // or have a placeholder). | |
302 // Must check ClassCircularity before checking if super class is already loaded | |
303 // | |
304 // We might not already have a placeholder if this child_name was | |
305 // first seen via resolve_from_stream (jni_DefineClass or JVM_DefineClass); | |
306 // the name of the class might not be known until the stream is actually | |
307 // parsed. | |
308 // Bugs 4643874, 4715493 | |
309 // compute_hash can have a safepoint | |
310 | |
311 unsigned int d_hash = dictionary()->compute_hash(child_name, class_loader); | |
312 int d_index = dictionary()->hash_to_index(d_hash); | |
313 unsigned int p_hash = placeholders()->compute_hash(child_name, class_loader); | |
314 int p_index = placeholders()->hash_to_index(p_hash); | |
315 // can't throw error holding a lock | |
316 bool child_already_loaded = false; | |
317 bool throw_circularity_error = false; | |
318 { | |
319 MutexLocker mu(SystemDictionary_lock, THREAD); | |
320 klassOop childk = find_class(d_index, d_hash, child_name, class_loader); | |
321 klassOop quicksuperk; | |
322 // to support // loading: if child done loading, just return superclass | |
323 // if class_name, & class_loader don't match: | |
324 // if initial define, SD update will give LinkageError | |
325 // if redefine: compare_class_versions will give HIERARCHY_CHANGED | |
326 // so we don't throw an exception here. | |
327 // see: nsk redefclass014 & java.lang.instrument Instrument032 | |
328 if ((childk != NULL ) && (is_superclass) && | |
329 ((quicksuperk = instanceKlass::cast(childk)->super()) != NULL) && | |
330 | |
331 ((Klass::cast(quicksuperk)->name() == class_name()) && | |
332 (Klass::cast(quicksuperk)->class_loader() == class_loader()))) { | |
333 return quicksuperk; | |
334 } else { | |
335 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, class_loader); | |
336 if (probe && probe->check_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER)) { | |
337 throw_circularity_error = true; | |
338 } | |
339 | |
340 // add placeholder entry even if error - callers will remove on error | |
341 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, child_name, class_loader, PlaceholderTable::LOAD_SUPER, class_name, THREAD); | |
342 if (throw_circularity_error) { | |
343 newprobe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER); | |
344 } | |
345 } | |
346 } | |
347 if (throw_circularity_error) { | |
348 ResourceMark rm(THREAD); | |
349 THROW_MSG_0(vmSymbols::java_lang_ClassCircularityError(), child_name->as_C_string()); | |
350 } | |
351 | |
352 // java.lang.Object should have been found above | |
353 assert(class_name() != NULL, "null super class for resolving"); | |
354 // Resolve the super class or interface, check results on return | |
355 klassOop superk = NULL; | |
356 superk = SystemDictionary::resolve_or_null(class_name, | |
357 class_loader, | |
358 protection_domain, | |
359 THREAD); | |
360 | |
361 KlassHandle superk_h(THREAD, superk); | |
362 | |
363 // Note: clean up of placeholders currently in callers of | |
364 // resolve_super_or_fail - either at update_dictionary time | |
365 // or on error | |
366 { | |
367 MutexLocker mu(SystemDictionary_lock, THREAD); | |
368 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, class_loader); | |
369 if (probe != NULL) { | |
370 probe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER); | |
371 } | |
372 } | |
373 if (HAS_PENDING_EXCEPTION || superk_h() == NULL) { | |
374 // can null superk | |
375 superk_h = KlassHandle(THREAD, handle_resolution_exception(class_name, class_loader, protection_domain, true, superk_h, THREAD)); | |
376 } | |
377 | |
378 return superk_h(); | |
379 } | |
380 | |
381 | |
382 void SystemDictionary::validate_protection_domain(instanceKlassHandle klass, | |
383 Handle class_loader, | |
384 Handle protection_domain, | |
385 TRAPS) { | |
386 if(!has_checkPackageAccess()) return; | |
387 | |
388 // Now we have to call back to java to check if the initating class has access | |
389 JavaValue result(T_VOID); | |
390 if (TraceProtectionDomainVerification) { | |
391 // Print out trace information | |
392 tty->print_cr("Checking package access"); | |
393 tty->print(" - class loader: "); class_loader()->print_value_on(tty); tty->cr(); | |
394 tty->print(" - protection domain: "); protection_domain()->print_value_on(tty); tty->cr(); | |
395 tty->print(" - loading: "); klass()->print_value_on(tty); tty->cr(); | |
396 } | |
397 | |
398 assert(class_loader() != NULL, "should not have non-null protection domain for null classloader"); | |
399 | |
400 KlassHandle system_loader(THREAD, SystemDictionary::classloader_klass()); | |
401 JavaCalls::call_special(&result, | |
402 class_loader, | |
403 system_loader, | |
404 vmSymbolHandles::checkPackageAccess_name(), | |
405 vmSymbolHandles::class_protectiondomain_signature(), | |
406 Handle(THREAD, klass->java_mirror()), | |
407 protection_domain, | |
408 THREAD); | |
409 | |
410 if (TraceProtectionDomainVerification) { | |
411 if (HAS_PENDING_EXCEPTION) { | |
412 tty->print_cr(" -> DENIED !!!!!!!!!!!!!!!!!!!!!"); | |
413 } else { | |
414 tty->print_cr(" -> granted"); | |
415 } | |
416 tty->cr(); | |
417 } | |
418 | |
419 if (HAS_PENDING_EXCEPTION) return; | |
420 | |
421 // If no exception has been thrown, we have validated the protection domain | |
422 // Insert the protection domain of the initiating class into the set. | |
423 { | |
424 // We recalculate the entry here -- we've called out to java since | |
425 // the last time it was calculated. | |
426 symbolHandle kn(THREAD, klass->name()); | |
427 unsigned int d_hash = dictionary()->compute_hash(kn, class_loader); | |
428 int d_index = dictionary()->hash_to_index(d_hash); | |
429 | |
430 MutexLocker mu(SystemDictionary_lock, THREAD); | |
431 { | |
432 // Note that we have an entry, and entries can be deleted only during GC, | |
433 // so we cannot allow GC to occur while we're holding this entry. | |
434 | |
435 // We're using a No_Safepoint_Verifier to catch any place where we | |
436 // might potentially do a GC at all. | |
437 // SystemDictionary::do_unloading() asserts that classes are only | |
438 // unloaded at a safepoint. | |
439 No_Safepoint_Verifier nosafepoint; | |
440 dictionary()->add_protection_domain(d_index, d_hash, klass, class_loader, | |
441 protection_domain, THREAD); | |
442 } | |
443 } | |
444 } | |
445 | |
446 // We only get here if this thread finds that another thread | |
447 // has already claimed the placeholder token for the current operation, | |
448 // but that other thread either never owned or gave up the | |
449 // object lock | |
450 // Waits on SystemDictionary_lock to indicate placeholder table updated | |
451 // On return, caller must recheck placeholder table state | |
452 // | |
453 // We only get here if | |
454 // 1) custom classLoader, i.e. not bootstrap classloader | |
455 // 2) UnsyncloadClass not set | |
456 // 3) custom classLoader has broken the class loader objectLock | |
457 // so another thread got here in parallel | |
458 // | |
459 // lockObject must be held. | |
460 // Complicated dance due to lock ordering: | |
461 // Must first release the classloader object lock to | |
462 // allow initial definer to complete the class definition | |
463 // and to avoid deadlock | |
464 // Reclaim classloader lock object with same original recursion count | |
465 // Must release SystemDictionary_lock after notify, since | |
466 // class loader lock must be claimed before SystemDictionary_lock | |
467 // to prevent deadlocks | |
468 // | |
469 // The notify allows applications that did an untimed wait() on | |
470 // the classloader object lock to not hang. | |
471 void SystemDictionary::double_lock_wait(Handle lockObject, TRAPS) { | |
472 assert_lock_strong(SystemDictionary_lock); | |
473 | |
474 bool calledholdinglock | |
475 = ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, lockObject); | |
476 assert(calledholdinglock,"must hold lock for notify"); | |
477 assert(!UnsyncloadClass, "unexpected double_lock_wait"); | |
478 ObjectSynchronizer::notifyall(lockObject, THREAD); | |
479 intptr_t recursions = ObjectSynchronizer::complete_exit(lockObject, THREAD); | |
480 SystemDictionary_lock->wait(); | |
481 SystemDictionary_lock->unlock(); | |
482 ObjectSynchronizer::reenter(lockObject, recursions, THREAD); | |
483 SystemDictionary_lock->lock(); | |
484 } | |
485 | |
486 // If the class in is in the placeholder table, class loading is in progress | |
487 // For cases where the application changes threads to load classes, it | |
488 // is critical to ClassCircularity detection that we try loading | |
489 // the superclass on the same thread internally, so we do parallel | |
490 // super class loading here. | |
491 // This also is critical in cases where the original thread gets stalled | |
492 // even in non-circularity situations. | |
493 // Note: only one thread can define the class, but multiple can resolve | |
494 // Note: must call resolve_super_or_fail even if null super - | |
495 // to force placeholder entry creation for this class | |
496 // Caller must check for pending exception | |
497 // Returns non-null klassOop if other thread has completed load | |
498 // and we are done, | |
499 // If return null klassOop and no pending exception, the caller must load the class | |
500 instanceKlassHandle SystemDictionary::handle_parallel_super_load( | |
501 symbolHandle name, symbolHandle superclassname, Handle class_loader, | |
502 Handle protection_domain, Handle lockObject, TRAPS) { | |
503 | |
504 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
505 unsigned int d_hash = dictionary()->compute_hash(name, class_loader); | |
506 int d_index = dictionary()->hash_to_index(d_hash); | |
507 unsigned int p_hash = placeholders()->compute_hash(name, class_loader); | |
508 int p_index = placeholders()->hash_to_index(p_hash); | |
509 | |
510 // superk is not used, resolve_super called for circularity check only | |
511 // This code is reached in two situations. One if this thread | |
512 // is loading the same class twice (e.g. ClassCircularity, or | |
513 // java.lang.instrument). | |
514 // The second is if another thread started the resolve_super first | |
515 // and has not yet finished. | |
516 // In both cases the original caller will clean up the placeholder | |
517 // entry on error. | |
518 klassOop superk = SystemDictionary::resolve_super_or_fail(name, | |
519 superclassname, | |
520 class_loader, | |
521 protection_domain, | |
522 true, | |
523 CHECK_(nh)); | |
524 // We don't redefine the class, so we just need to clean up if there | |
525 // was not an error (don't want to modify any system dictionary | |
526 // data structures). | |
527 { | |
528 MutexLocker mu(SystemDictionary_lock, THREAD); | |
529 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
530 SystemDictionary_lock->notify_all(); | |
531 } | |
532 | |
533 // UnsyncloadClass does NOT wait for parallel superclass loads to complete | |
534 // Bootstrap classloader does wait for parallel superclass loads | |
535 if (UnsyncloadClass) { | |
536 MutexLocker mu(SystemDictionary_lock, THREAD); | |
537 // Check if classloading completed while we were loading superclass or waiting | |
538 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
539 if (check != NULL) { | |
540 // Klass is already loaded, so just return it | |
541 return(instanceKlassHandle(THREAD, check)); | |
542 } else { | |
543 return nh; | |
544 } | |
545 } | |
546 | |
547 // must loop to both handle other placeholder updates | |
548 // and spurious notifications | |
549 bool super_load_in_progress = true; | |
550 PlaceholderEntry* placeholder; | |
551 while (super_load_in_progress) { | |
552 MutexLocker mu(SystemDictionary_lock, THREAD); | |
553 // Check if classloading completed while we were loading superclass or waiting | |
554 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
555 if (check != NULL) { | |
556 // Klass is already loaded, so just return it | |
557 return(instanceKlassHandle(THREAD, check)); | |
558 } else { | |
559 placeholder = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
560 if (placeholder && placeholder->super_load_in_progress() ){ | |
561 // Before UnsyncloadClass: | |
562 // We only get here if the application has released the | |
563 // classloader lock when another thread was in the middle of loading a | |
564 // superclass/superinterface for this class, and now | |
565 // this thread is also trying to load this class. | |
566 // To minimize surprises, the first thread that started to | |
567 // load a class should be the one to complete the loading | |
568 // with the classfile it initially expected. | |
569 // This logic has the current thread wait once it has done | |
570 // all the superclass/superinterface loading it can, until | |
571 // the original thread completes the class loading or fails | |
572 // If it completes we will use the resulting instanceKlass | |
573 // which we will find below in the systemDictionary. | |
574 // We also get here for parallel bootstrap classloader | |
575 if (class_loader.is_null()) { | |
576 SystemDictionary_lock->wait(); | |
577 } else { | |
578 double_lock_wait(lockObject, THREAD); | |
579 } | |
580 } else { | |
581 // If not in SD and not in PH, other thread's load must have failed | |
582 super_load_in_progress = false; | |
583 } | |
584 } | |
585 } | |
586 return (nh); | |
587 } | |
588 | |
589 | |
590 klassOop SystemDictionary::resolve_instance_class_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS) { | |
591 assert(class_name.not_null() && !FieldType::is_array(class_name()), "invalid class name"); | |
592 // First check to see if we should remove wrapping L and ; | |
593 symbolHandle name; | |
594 if (FieldType::is_obj(class_name())) { | |
595 ResourceMark rm(THREAD); | |
596 // Ignore wrapping L and ;. | |
597 name = oopFactory::new_symbol_handle(class_name()->as_C_string() + 1, class_name()->utf8_length() - 2, CHECK_NULL); | |
598 } else { | |
599 name = class_name; | |
600 } | |
601 | |
602 // UseNewReflection | |
603 // Fix for 4474172; see evaluation for more details | |
604 class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); | |
605 | |
606 // Do lookup to see if class already exist and the protection domain | |
607 // has the right access | |
608 unsigned int d_hash = dictionary()->compute_hash(name, class_loader); | |
609 int d_index = dictionary()->hash_to_index(d_hash); | |
610 klassOop probe = dictionary()->find(d_index, d_hash, name, class_loader, | |
611 protection_domain, THREAD); | |
612 if (probe != NULL) return probe; | |
613 | |
614 | |
615 // Non-bootstrap class loaders will call out to class loader and | |
616 // define via jvm/jni_DefineClass which will acquire the | |
617 // class loader object lock to protect against multiple threads | |
618 // defining the class in parallel by accident. | |
619 // This lock must be acquired here so the waiter will find | |
620 // any successful result in the SystemDictionary and not attempt | |
621 // the define | |
622 // Classloaders that support parallelism, e.g. bootstrap classloader, | |
623 // or all classloaders with UnsyncloadClass do not acquire lock here | |
624 bool DoObjectLock = true; | |
625 if (UnsyncloadClass || (class_loader.is_null())) { | |
626 DoObjectLock = false; | |
627 } | |
628 | |
629 unsigned int p_hash = placeholders()->compute_hash(name, class_loader); | |
630 int p_index = placeholders()->hash_to_index(p_hash); | |
631 | |
632 // Class is not in SystemDictionary so we have to do loading. | |
633 // Make sure we are synchronized on the class loader before we proceed | |
634 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
635 check_loader_lock_contention(lockObject, THREAD); | |
636 ObjectLocker ol(lockObject, THREAD, DoObjectLock); | |
637 | |
638 // Check again (after locking) if class already exist in SystemDictionary | |
639 bool class_has_been_loaded = false; | |
640 bool super_load_in_progress = false; | |
641 bool havesupername = false; | |
642 instanceKlassHandle k; | |
643 PlaceholderEntry* placeholder; | |
644 symbolHandle superclassname; | |
645 | |
646 { | |
647 MutexLocker mu(SystemDictionary_lock, THREAD); | |
648 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
649 if (check != NULL) { | |
650 // Klass is already loaded, so just return it | |
651 class_has_been_loaded = true; | |
652 k = instanceKlassHandle(THREAD, check); | |
653 } else { | |
654 placeholder = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
655 if (placeholder && placeholder->super_load_in_progress()) { | |
656 super_load_in_progress = true; | |
657 if (placeholder->havesupername() == true) { | |
658 superclassname = symbolHandle(THREAD, placeholder->supername()); | |
659 havesupername = true; | |
660 } | |
661 } | |
662 } | |
663 } | |
664 | |
665 // If the class in is in the placeholder table, class loading is in progress | |
666 if (super_load_in_progress && havesupername==true) { | |
667 k = SystemDictionary::handle_parallel_super_load(name, superclassname, | |
668 class_loader, protection_domain, lockObject, THREAD); | |
669 if (HAS_PENDING_EXCEPTION) { | |
670 return NULL; | |
671 } | |
672 if (!k.is_null()) { | |
673 class_has_been_loaded = true; | |
674 } | |
675 } | |
676 | |
677 if (!class_has_been_loaded) { | |
678 | |
679 // add placeholder entry to record loading instance class | |
680 // Five cases: | |
681 // All cases need to prevent modifying bootclasssearchpath | |
682 // in parallel with a classload of same classname | |
683 // case 1. traditional classloaders that rely on the classloader object lock | |
684 // - no other need for LOAD_INSTANCE | |
685 // case 2. traditional classloaders that break the classloader object lock | |
686 // as a deadlock workaround. Detection of this case requires that | |
687 // this check is done while holding the classloader object lock, | |
688 // and that lock is still held when calling classloader's loadClass. | |
689 // For these classloaders, we ensure that the first requestor | |
690 // completes the load and other requestors wait for completion. | |
691 // case 3. UnsyncloadClass - don't use objectLocker | |
692 // With this flag, we allow parallel classloading of a | |
693 // class/classloader pair | |
694 // case4. Bootstrap classloader - don't own objectLocker | |
695 // This classloader supports parallelism at the classloader level, | |
696 // but only allows a single load of a class/classloader pair. | |
697 // No performance benefit and no deadlock issues. | |
698 // case 5. Future: parallel user level classloaders - without objectLocker | |
699 symbolHandle nullsymbolHandle; | |
700 bool throw_circularity_error = false; | |
701 { | |
702 MutexLocker mu(SystemDictionary_lock, THREAD); | |
703 if (!UnsyncloadClass) { | |
704 PlaceholderEntry* oldprobe = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
705 if (oldprobe) { | |
706 // only need check_seen_thread once, not on each loop | |
707 // 6341374 java/lang/Instrument with -Xcomp | |
708 if (oldprobe->check_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE)) { | |
709 throw_circularity_error = true; | |
710 } else { | |
711 // case 1: traditional: should never see load_in_progress. | |
712 while (!class_has_been_loaded && oldprobe && oldprobe->instance_load_in_progress()) { | |
713 | |
714 // case 4: bootstrap classloader: prevent futile classloading, | |
715 // wait on first requestor | |
716 if (class_loader.is_null()) { | |
717 SystemDictionary_lock->wait(); | |
718 } else { | |
719 // case 2: traditional with broken classloader lock. wait on first | |
720 // requestor. | |
721 double_lock_wait(lockObject, THREAD); | |
722 } | |
723 // Check if classloading completed while we were waiting | |
724 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
725 if (check != NULL) { | |
726 // Klass is already loaded, so just return it | |
727 k = instanceKlassHandle(THREAD, check); | |
728 class_has_been_loaded = true; | |
729 } | |
730 // check if other thread failed to load and cleaned up | |
731 oldprobe = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
732 } | |
733 } | |
734 } | |
735 } | |
736 // All cases: add LOAD_INSTANCE | |
737 // case 3: UnsyncloadClass: allow competing threads to try | |
738 // LOAD_INSTANCE in parallel | |
739 // add placeholder entry even if error - callers will remove on error | |
740 if (!class_has_been_loaded) { | |
741 PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, name, class_loader, PlaceholderTable::LOAD_INSTANCE, nullsymbolHandle, THREAD); | |
742 if (throw_circularity_error) { | |
743 newprobe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE); | |
744 } | |
745 // For class loaders that do not acquire the classloader object lock, | |
746 // if they did not catch another thread holding LOAD_INSTANCE, | |
747 // need a check analogous to the acquire ObjectLocker/find_class | |
748 // i.e. now that we hold the LOAD_INSTANCE token on loading this class/CL | |
749 // one final check if the load has already completed | |
750 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
751 if (check != NULL) { | |
752 // Klass is already loaded, so just return it | |
753 k = instanceKlassHandle(THREAD, check); | |
754 class_has_been_loaded = true; | |
755 newprobe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE); | |
756 } | |
757 } | |
758 } | |
759 // must throw error outside of owning lock | |
760 if (throw_circularity_error) { | |
761 ResourceMark rm(THREAD); | |
762 THROW_MSG_0(vmSymbols::java_lang_ClassCircularityError(), name->as_C_string()); | |
763 } | |
764 | |
765 if (!class_has_been_loaded) { | |
766 | |
767 // Do actual loading | |
768 k = load_instance_class(name, class_loader, THREAD); | |
769 | |
770 // In custom class loaders, the usual findClass calls | |
771 // findLoadedClass, which directly searches the SystemDictionary, then | |
772 // defineClass. If these are not atomic with respect to other threads, | |
773 // the findLoadedClass can fail, but the defineClass can get a | |
774 // LinkageError:: duplicate class definition. | |
775 // If they got a linkageError, check if a parallel class load succeeded. | |
776 // If it did, then for bytecode resolution the specification requires | |
777 // that we return the same result we did for the other thread, i.e. the | |
778 // successfully loaded instanceKlass | |
779 // Note: Class can not be unloaded as long as any classloader refs exist | |
780 // Should not get here for classloaders that support parallelism | |
781 // with the new cleaner mechanism, e.g. bootstrap classloader | |
782 if (UnsyncloadClass || (class_loader.is_null())) { | |
783 if (k.is_null() && HAS_PENDING_EXCEPTION | |
784 && PENDING_EXCEPTION->is_a(SystemDictionary::linkageError_klass())) { | |
785 MutexLocker mu(SystemDictionary_lock, THREAD); | |
786 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
787 if (check != NULL) { | |
788 // Klass is already loaded, so just use it | |
789 k = instanceKlassHandle(THREAD, check); | |
790 CLEAR_PENDING_EXCEPTION; | |
791 guarantee((!class_loader.is_null()), "dup definition for bootstrap loader?"); | |
792 } | |
793 } | |
794 } | |
795 | |
796 // clean up placeholder entries for success or error | |
797 // This cleans up LOAD_INSTANCE entries | |
798 // It also cleans up LOAD_SUPER entries on errors from | |
799 // calling load_instance_class | |
800 { | |
801 MutexLocker mu(SystemDictionary_lock, THREAD); | |
802 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name, class_loader); | |
803 if (probe != NULL) { | |
804 probe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE); | |
805 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
806 SystemDictionary_lock->notify_all(); | |
807 } | |
808 } | |
809 | |
810 // If everything was OK (no exceptions, no null return value), and | |
811 // class_loader is NOT the defining loader, do a little more bookkeeping. | |
812 if (!HAS_PENDING_EXCEPTION && !k.is_null() && | |
813 k->class_loader() != class_loader()) { | |
814 | |
815 check_constraints(d_index, d_hash, k, class_loader, false, THREAD); | |
816 | |
817 // Need to check for a PENDING_EXCEPTION again; check_constraints | |
818 // can throw and doesn't use the CHECK macro. | |
819 if (!HAS_PENDING_EXCEPTION) { | |
820 { // Grabbing the Compile_lock prevents systemDictionary updates | |
821 // during compilations. | |
822 MutexLocker mu(Compile_lock, THREAD); | |
823 update_dictionary(d_index, d_hash, p_index, p_hash, | |
824 k, class_loader, THREAD); | |
825 } | |
826 if (JvmtiExport::should_post_class_load()) { | |
827 Thread *thread = THREAD; | |
828 assert(thread->is_Java_thread(), "thread->is_Java_thread()"); | |
829 JvmtiExport::post_class_load((JavaThread *) thread, k()); | |
830 } | |
831 } | |
832 } | |
833 if (HAS_PENDING_EXCEPTION || k.is_null()) { | |
834 // On error, clean up placeholders | |
835 { | |
836 MutexLocker mu(SystemDictionary_lock, THREAD); | |
837 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
838 SystemDictionary_lock->notify_all(); | |
839 } | |
840 return NULL; | |
841 } | |
842 } | |
843 } | |
844 | |
845 #ifdef ASSERT | |
846 { | |
847 Handle loader (THREAD, k->class_loader()); | |
848 MutexLocker mu(SystemDictionary_lock, THREAD); | |
849 oop kk = find_class_or_placeholder(name, loader); | |
850 assert(kk == k(), "should be present in dictionary"); | |
851 } | |
852 #endif | |
853 | |
854 // return if the protection domain in NULL | |
855 if (protection_domain() == NULL) return k(); | |
856 | |
857 // Check the protection domain has the right access | |
858 { | |
859 MutexLocker mu(SystemDictionary_lock, THREAD); | |
860 // Note that we have an entry, and entries can be deleted only during GC, | |
861 // so we cannot allow GC to occur while we're holding this entry. | |
862 // We're using a No_Safepoint_Verifier to catch any place where we | |
863 // might potentially do a GC at all. | |
864 // SystemDictionary::do_unloading() asserts that classes are only | |
865 // unloaded at a safepoint. | |
866 No_Safepoint_Verifier nosafepoint; | |
867 if (dictionary()->is_valid_protection_domain(d_index, d_hash, name, | |
868 class_loader, | |
869 protection_domain)) { | |
870 return k(); | |
871 } | |
872 } | |
873 | |
874 // Verify protection domain. If it fails an exception is thrown | |
875 validate_protection_domain(k, class_loader, protection_domain, CHECK_(klassOop(NULL))); | |
876 | |
877 return k(); | |
878 } | |
879 | |
880 | |
881 // This routine does not lock the system dictionary. | |
882 // | |
883 // Since readers don't hold a lock, we must make sure that system | |
884 // dictionary entries are only removed at a safepoint (when only one | |
885 // thread is running), and are added to in a safe way (all links must | |
886 // be updated in an MT-safe manner). | |
887 // | |
888 // Callers should be aware that an entry could be added just after | |
889 // _dictionary->bucket(index) is read here, so the caller will not see | |
890 // the new entry. | |
891 | |
892 klassOop SystemDictionary::find(symbolHandle class_name, | |
893 Handle class_loader, | |
894 Handle protection_domain, | |
895 TRAPS) { | |
896 | |
897 unsigned int d_hash = dictionary()->compute_hash(class_name, class_loader); | |
898 int d_index = dictionary()->hash_to_index(d_hash); | |
899 | |
900 { | |
901 // Note that we have an entry, and entries can be deleted only during GC, | |
902 // so we cannot allow GC to occur while we're holding this entry. | |
903 // We're using a No_Safepoint_Verifier to catch any place where we | |
904 // might potentially do a GC at all. | |
905 // SystemDictionary::do_unloading() asserts that classes are only | |
906 // unloaded at a safepoint. | |
907 No_Safepoint_Verifier nosafepoint; | |
908 return dictionary()->find(d_index, d_hash, class_name, class_loader, | |
909 protection_domain, THREAD); | |
910 } | |
911 } | |
912 | |
913 | |
914 // Look for a loaded instance or array klass by name. Do not do any loading. | |
915 // return NULL in case of error. | |
916 klassOop SystemDictionary::find_instance_or_array_klass(symbolHandle class_name, | |
917 Handle class_loader, | |
918 Handle protection_domain, | |
919 TRAPS) { | |
920 klassOop k = NULL; | |
921 assert(class_name() != NULL, "class name must be non NULL"); | |
922 if (FieldType::is_array(class_name())) { | |
923 // The name refers to an array. Parse the name. | |
924 jint dimension; | |
925 symbolOop object_key; | |
926 | |
927 // dimension and object_key are assigned as a side-effect of this call | |
928 BasicType t = FieldType::get_array_info(class_name(), &dimension, | |
929 &object_key, CHECK_(NULL)); | |
930 if (t != T_OBJECT) { | |
931 k = Universe::typeArrayKlassObj(t); | |
932 } else { | |
933 symbolHandle h_key(THREAD, object_key); | |
934 k = SystemDictionary::find(h_key, class_loader, protection_domain, THREAD); | |
935 } | |
936 if (k != NULL) { | |
937 k = Klass::cast(k)->array_klass_or_null(dimension); | |
938 } | |
939 } else { | |
940 k = find(class_name, class_loader, protection_domain, THREAD); | |
941 } | |
942 return k; | |
943 } | |
944 | |
945 // Note: this method is much like resolve_from_stream, but | |
946 // updates no supplemental data structures. | |
947 // TODO consolidate the two methods with a helper routine? | |
948 klassOop SystemDictionary::parse_stream(symbolHandle class_name, | |
949 Handle class_loader, | |
950 Handle protection_domain, | |
951 ClassFileStream* st, | |
952 TRAPS) { | |
953 symbolHandle parsed_name; | |
954 | |
955 // Parse the stream. Note that we do this even though this klass might | |
956 // already be present in the SystemDictionary, otherwise we would not | |
957 // throw potential ClassFormatErrors. | |
958 // | |
959 // Note: "name" is updated. | |
960 // Further note: a placeholder will be added for this class when | |
961 // super classes are loaded (resolve_super_or_fail). We expect this | |
962 // to be called for all classes but java.lang.Object; and we preload | |
963 // java.lang.Object through resolve_or_fail, not this path. | |
964 | |
965 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
966 class_loader, | |
967 protection_domain, | |
968 parsed_name, | |
969 THREAD); | |
970 | |
971 | |
972 // We don't redefine the class, so we just need to clean up whether there | |
973 // was an error or not (don't want to modify any system dictionary | |
974 // data structures). | |
975 // Parsed name could be null if we threw an error before we got far | |
976 // enough along to parse it -- in that case, there is nothing to clean up. | |
977 if (!parsed_name.is_null()) { | |
978 unsigned int p_hash = placeholders()->compute_hash(parsed_name, | |
979 class_loader); | |
980 int p_index = placeholders()->hash_to_index(p_hash); | |
981 { | |
982 MutexLocker mu(SystemDictionary_lock, THREAD); | |
983 placeholders()->find_and_remove(p_index, p_hash, parsed_name, class_loader, THREAD); | |
984 SystemDictionary_lock->notify_all(); | |
985 } | |
986 } | |
987 | |
988 return k(); | |
989 } | |
990 | |
991 // Add a klass to the system from a stream (called by jni_DefineClass and | |
992 // JVM_DefineClass). | |
993 // Note: class_name can be NULL. In that case we do not know the name of | |
994 // the class until we have parsed the stream. | |
995 | |
996 klassOop SystemDictionary::resolve_from_stream(symbolHandle class_name, | |
997 Handle class_loader, | |
998 Handle protection_domain, | |
999 ClassFileStream* st, | |
1000 TRAPS) { | |
1001 | |
1002 // Make sure we are synchronized on the class loader before we initiate | |
1003 // loading. | |
1004 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
1005 check_loader_lock_contention(lockObject, THREAD); | |
1006 ObjectLocker ol(lockObject, THREAD); | |
1007 | |
1008 symbolHandle parsed_name; | |
1009 | |
1010 // Parse the stream. Note that we do this even though this klass might | |
1011 // already be present in the SystemDictionary, otherwise we would not | |
1012 // throw potential ClassFormatErrors. | |
1013 // | |
1014 // Note: "name" is updated. | |
1015 // Further note: a placeholder will be added for this class when | |
1016 // super classes are loaded (resolve_super_or_fail). We expect this | |
1017 // to be called for all classes but java.lang.Object; and we preload | |
1018 // java.lang.Object through resolve_or_fail, not this path. | |
1019 | |
1020 instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name, | |
1021 class_loader, | |
1022 protection_domain, | |
1023 parsed_name, | |
1024 THREAD); | |
1025 | |
1026 const char* pkg = "java/"; | |
1027 if (!HAS_PENDING_EXCEPTION && | |
1028 !class_loader.is_null() && | |
1029 !parsed_name.is_null() && | |
1030 !strncmp((const char*)parsed_name->bytes(), pkg, strlen(pkg))) { | |
1031 // It is illegal to define classes in the "java." package from | |
1032 // JVM_DefineClass or jni_DefineClass unless you're the bootclassloader | |
1033 ResourceMark rm(THREAD); | |
1034 char* name = parsed_name->as_C_string(); | |
1035 char* index = strrchr(name, '/'); | |
1036 *index = '\0'; // chop to just the package name | |
1037 while ((index = strchr(name, '/')) != NULL) { | |
1038 *index = '.'; // replace '/' with '.' in package name | |
1039 } | |
1040 const char* fmt = "Prohibited package name: %s"; | |
1041 size_t len = strlen(fmt) + strlen(name); | |
1042 char* message = NEW_RESOURCE_ARRAY(char, len); | |
1043 jio_snprintf(message, len, fmt, name); | |
1044 Exceptions::_throw_msg(THREAD_AND_LOCATION, | |
1045 vmSymbols::java_lang_SecurityException(), message); | |
1046 } | |
1047 | |
1048 if (!HAS_PENDING_EXCEPTION) { | |
1049 assert(!parsed_name.is_null(), "Sanity"); | |
1050 assert(class_name.is_null() || class_name() == parsed_name(), | |
1051 "name mismatch"); | |
1052 // Verification prevents us from creating names with dots in them, this | |
1053 // asserts that that's the case. | |
1054 assert(is_internal_format(parsed_name), | |
1055 "external class name format used internally"); | |
1056 | |
1057 // Add class just loaded | |
1058 define_instance_class(k, THREAD); | |
1059 } | |
1060 | |
1061 // If parsing the class file or define_instance_class failed, we | |
1062 // need to remove the placeholder added on our behalf. But we | |
1063 // must make sure parsed_name is valid first (it won't be if we had | |
1064 // a format error before the class was parsed far enough to | |
1065 // find the name). | |
1066 if (HAS_PENDING_EXCEPTION && !parsed_name.is_null()) { | |
1067 unsigned int p_hash = placeholders()->compute_hash(parsed_name, | |
1068 class_loader); | |
1069 int p_index = placeholders()->hash_to_index(p_hash); | |
1070 { | |
1071 MutexLocker mu(SystemDictionary_lock, THREAD); | |
1072 placeholders()->find_and_remove(p_index, p_hash, parsed_name, class_loader, THREAD); | |
1073 SystemDictionary_lock->notify_all(); | |
1074 } | |
1075 return NULL; | |
1076 } | |
1077 | |
1078 // Make sure that we didn't leave a place holder in the | |
1079 // SystemDictionary; this is only done on success | |
1080 debug_only( { | |
1081 if (!HAS_PENDING_EXCEPTION) { | |
1082 assert(!parsed_name.is_null(), "parsed_name is still null?"); | |
1083 symbolHandle h_name (THREAD, k->name()); | |
1084 Handle h_loader (THREAD, k->class_loader()); | |
1085 | |
1086 MutexLocker mu(SystemDictionary_lock, THREAD); | |
1087 | |
1088 oop check = find_class_or_placeholder(parsed_name, class_loader); | |
1089 assert(check == k(), "should be present in the dictionary"); | |
1090 | |
1091 oop check2 = find_class_or_placeholder(h_name, h_loader); | |
1092 assert(check == check2, "name inconsistancy in SystemDictionary"); | |
1093 } | |
1094 } ); | |
1095 | |
1096 return k(); | |
1097 } | |
1098 | |
1099 | |
1100 void SystemDictionary::set_shared_dictionary(HashtableBucket* t, int length, | |
1101 int number_of_entries) { | |
1102 assert(length == _nof_buckets * sizeof(HashtableBucket), | |
1103 "bad shared dictionary size."); | |
1104 _shared_dictionary = new Dictionary(_nof_buckets, t, number_of_entries); | |
1105 } | |
1106 | |
1107 | |
1108 // If there is a shared dictionary, then find the entry for the | |
1109 // given shared system class, if any. | |
1110 | |
1111 klassOop SystemDictionary::find_shared_class(symbolHandle class_name) { | |
1112 if (shared_dictionary() != NULL) { | |
1113 unsigned int d_hash = dictionary()->compute_hash(class_name, Handle()); | |
1114 int d_index = dictionary()->hash_to_index(d_hash); | |
1115 return shared_dictionary()->find_shared_class(d_index, d_hash, class_name); | |
1116 } else { | |
1117 return NULL; | |
1118 } | |
1119 } | |
1120 | |
1121 | |
1122 // Load a class from the shared spaces (found through the shared system | |
1123 // dictionary). Force the superclass and all interfaces to be loaded. | |
1124 // Update the class definition to include sibling classes and no | |
1125 // subclasses (yet). [Classes in the shared space are not part of the | |
1126 // object hierarchy until loaded.] | |
1127 | |
1128 instanceKlassHandle SystemDictionary::load_shared_class( | |
1129 symbolHandle class_name, Handle class_loader, TRAPS) { | |
1130 instanceKlassHandle ik (THREAD, find_shared_class(class_name)); | |
1131 return load_shared_class(ik, class_loader, THREAD); | |
1132 } | |
1133 | |
1134 // Note well! Changes to this method may affect oop access order | |
1135 // in the shared archive. Please take care to not make changes that | |
1136 // adversely affect cold start time by changing the oop access order | |
1137 // that is specified in dump.cpp MarkAndMoveOrderedReadOnly and | |
1138 // MarkAndMoveOrderedReadWrite closures. | |
1139 instanceKlassHandle SystemDictionary::load_shared_class( | |
1140 instanceKlassHandle ik, Handle class_loader, TRAPS) { | |
1141 assert(class_loader.is_null(), "non-null classloader for shared class?"); | |
1142 if (ik.not_null()) { | |
1143 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
1144 symbolHandle class_name(THREAD, ik->name()); | |
1145 | |
1146 // Found the class, now load the superclass and interfaces. If they | |
1147 // are shared, add them to the main system dictionary and reset | |
1148 // their hierarchy references (supers, subs, and interfaces). | |
1149 | |
1150 if (ik->super() != NULL) { | |
1151 symbolHandle cn(THREAD, ik->super()->klass_part()->name()); | |
1152 resolve_super_or_fail(class_name, cn, | |
1153 class_loader, Handle(), true, CHECK_(nh)); | |
1154 } | |
1155 | |
1156 objArrayHandle interfaces (THREAD, ik->local_interfaces()); | |
1157 int num_interfaces = interfaces->length(); | |
1158 for (int index = 0; index < num_interfaces; index++) { | |
1159 klassOop k = klassOop(interfaces->obj_at(index)); | |
1160 | |
1161 // Note: can not use instanceKlass::cast here because | |
1162 // interfaces' instanceKlass's C++ vtbls haven't been | |
1163 // reinitialized yet (they will be once the interface classes | |
1164 // are loaded) | |
1165 symbolHandle name (THREAD, k->klass_part()->name()); | |
1166 resolve_super_or_fail(class_name, name, class_loader, Handle(), false, CHECK_(nh)); | |
1167 } | |
1168 | |
1169 // Adjust methods to recover missing data. They need addresses for | |
1170 // interpreter entry points and their default native method address | |
1171 // must be reset. | |
1172 | |
1173 // Updating methods must be done under a lock so multiple | |
1174 // threads don't update these in parallel | |
1175 // Shared classes are all currently loaded by the bootstrap | |
1176 // classloader, so this will never cause a deadlock on | |
1177 // a custom class loader lock. | |
1178 | |
1179 { | |
1180 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); | |
1181 check_loader_lock_contention(lockObject, THREAD); | |
1182 ObjectLocker ol(lockObject, THREAD, true); | |
1183 | |
1184 objArrayHandle methods (THREAD, ik->methods()); | |
1185 int num_methods = methods->length(); | |
1186 for (int index2 = 0; index2 < num_methods; ++index2) { | |
1187 methodHandle m(THREAD, methodOop(methods->obj_at(index2))); | |
1188 m()->link_method(m, CHECK_(nh)); | |
1189 } | |
1190 } | |
1191 | |
1192 if (TraceClassLoading) { | |
1193 ResourceMark rm; | |
1194 tty->print("[Loaded %s", ik->external_name()); | |
1195 tty->print(" from shared objects file"); | |
1196 tty->print_cr("]"); | |
1197 } | |
1198 // notify a class loaded from shared object | |
1199 ClassLoadingService::notify_class_loaded(instanceKlass::cast(ik()), | |
1200 true /* shared class */); | |
1201 } | |
1202 return ik; | |
1203 } | |
1204 | |
1205 #ifdef KERNEL | |
1206 // Some classes on the bootstrap class path haven't been installed on the | |
1207 // system yet. Call the DownloadManager method to make them appear in the | |
1208 // bootstrap class path and try again to load the named class. | |
1209 // Note that with delegation class loaders all classes in another loader will | |
1210 // first try to call this so it'd better be fast!! | |
1211 static instanceKlassHandle download_and_retry_class_load( | |
1212 symbolHandle class_name, | |
1213 TRAPS) { | |
1214 | |
1215 klassOop dlm = SystemDictionary::sun_jkernel_DownloadManager_klass(); | |
1216 instanceKlassHandle nk; | |
1217 | |
1218 // If download manager class isn't loaded just return. | |
1219 if (dlm == NULL) return nk; | |
1220 | |
1221 { HandleMark hm(THREAD); | |
1222 ResourceMark rm(THREAD); | |
1223 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nk)); | |
1224 Handle class_string = java_lang_String::externalize_classname(s, CHECK_(nk)); | |
1225 | |
1226 // return value | |
1227 JavaValue result(T_OBJECT); | |
1228 | |
1229 // Call the DownloadManager. We assume that it has a lock because | |
1230 // multiple classes could be not found and downloaded at the same time. | |
1231 // class sun.misc.DownloadManager; | |
1232 // public static String getBootClassPathEntryForClass(String className); | |
1233 JavaCalls::call_static(&result, | |
1234 KlassHandle(THREAD, dlm), | |
1235 vmSymbolHandles::getBootClassPathEntryForClass_name(), | |
1236 vmSymbolHandles::string_string_signature(), | |
1237 class_string, | |
1238 CHECK_(nk)); | |
1239 | |
1240 // Get result.string and add to bootclasspath | |
1241 assert(result.get_type() == T_OBJECT, "just checking"); | |
1242 oop obj = (oop) result.get_jobject(); | |
1243 if (obj == NULL) { return nk; } | |
1244 | |
22
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1245 Handle h_obj(THREAD, obj); |
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1246 char* new_class_name = java_lang_String::as_platform_dependent_str(h_obj, |
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1247 CHECK_(nk)); |
0 | 1248 |
1249 // lock the loader | |
1250 // we use this lock because JVMTI does. | |
1251 Handle loader_lock(THREAD, SystemDictionary::system_loader_lock()); | |
1252 | |
1253 ObjectLocker ol(loader_lock, THREAD); | |
1254 // add the file to the bootclasspath | |
1255 ClassLoader::update_class_path_entry_list(new_class_name, true); | |
1256 } // end HandleMark | |
1257 | |
1258 if (TraceClassLoading) { | |
1259 ClassLoader::print_bootclasspath(); | |
1260 } | |
1261 return ClassLoader::load_classfile(class_name, CHECK_(nk)); | |
1262 } | |
1263 #endif // KERNEL | |
1264 | |
1265 | |
1266 instanceKlassHandle SystemDictionary::load_instance_class(symbolHandle class_name, Handle class_loader, TRAPS) { | |
1267 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
1268 if (class_loader.is_null()) { | |
1269 // Search the shared system dictionary for classes preloaded into the | |
1270 // shared spaces. | |
1271 instanceKlassHandle k; | |
1272 k = load_shared_class(class_name, class_loader, THREAD); | |
1273 | |
1274 if (k.is_null()) { | |
1275 // Use VM class loader | |
1276 k = ClassLoader::load_classfile(class_name, CHECK_(nh)); | |
1277 } | |
1278 | |
1279 #ifdef KERNEL | |
1280 // If the VM class loader has failed to load the class, call the | |
1281 // DownloadManager class to make it magically appear on the classpath | |
1282 // and try again. This is only configured with the Kernel VM. | |
1283 if (k.is_null()) { | |
1284 k = download_and_retry_class_load(class_name, CHECK_(nh)); | |
1285 } | |
1286 #endif // KERNEL | |
1287 | |
1288 // find_or_define_instance_class may return a different k | |
1289 if (!k.is_null()) { | |
1290 k = find_or_define_instance_class(class_name, class_loader, k, CHECK_(nh)); | |
1291 } | |
1292 return k; | |
1293 } else { | |
1294 // Use user specified class loader to load class. Call loadClass operation on class_loader. | |
1295 ResourceMark rm(THREAD); | |
1296 | |
1297 Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nh)); | |
1298 // Translate to external class name format, i.e., convert '/' chars to '.' | |
1299 Handle string = java_lang_String::externalize_classname(s, CHECK_(nh)); | |
1300 | |
1301 JavaValue result(T_OBJECT); | |
1302 | |
1303 KlassHandle spec_klass (THREAD, SystemDictionary::classloader_klass()); | |
1304 | |
1305 // UnsyncloadClass option means don't synchronize loadClass() calls. | |
1306 // loadClassInternal() is synchronized and public loadClass(String) is not. | |
1307 // This flag is for diagnostic purposes only. It is risky to call | |
1308 // custom class loaders without synchronization. | |
1309 // WARNING If a custom class loader does NOT synchronizer findClass, or callers of | |
1310 // findClass, this flag risks unexpected timing bugs in the field. | |
1311 // Do NOT assume this will be supported in future releases. | |
1312 if (!UnsyncloadClass && has_loadClassInternal()) { | |
1313 JavaCalls::call_special(&result, | |
1314 class_loader, | |
1315 spec_klass, | |
1316 vmSymbolHandles::loadClassInternal_name(), | |
1317 vmSymbolHandles::string_class_signature(), | |
1318 string, | |
1319 CHECK_(nh)); | |
1320 } else { | |
1321 JavaCalls::call_virtual(&result, | |
1322 class_loader, | |
1323 spec_klass, | |
1324 vmSymbolHandles::loadClass_name(), | |
1325 vmSymbolHandles::string_class_signature(), | |
1326 string, | |
1327 CHECK_(nh)); | |
1328 } | |
1329 | |
1330 assert(result.get_type() == T_OBJECT, "just checking"); | |
1331 oop obj = (oop) result.get_jobject(); | |
1332 | |
1333 // Primitive classes return null since forName() can not be | |
1334 // used to obtain any of the Class objects representing primitives or void | |
1335 if ((obj != NULL) && !(java_lang_Class::is_primitive(obj))) { | |
1336 instanceKlassHandle k = | |
1337 instanceKlassHandle(THREAD, java_lang_Class::as_klassOop(obj)); | |
1338 // For user defined Java class loaders, check that the name returned is | |
1339 // the same as that requested. This check is done for the bootstrap | |
1340 // loader when parsing the class file. | |
1341 if (class_name() == k->name()) { | |
1342 return k; | |
1343 } | |
1344 } | |
1345 // Class is not found or has the wrong name, return NULL | |
1346 return nh; | |
1347 } | |
1348 } | |
1349 | |
1350 void SystemDictionary::define_instance_class(instanceKlassHandle k, TRAPS) { | |
1351 | |
1352 Handle class_loader_h(THREAD, k->class_loader()); | |
1353 | |
1354 // for bootstrap classloader don't acquire lock | |
1355 if (!class_loader_h.is_null()) { | |
1356 assert(ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, | |
1357 compute_loader_lock_object(class_loader_h, THREAD)), | |
1358 "define called without lock"); | |
1359 } | |
1360 | |
1361 | |
1362 // Check class-loading constraints. Throw exception if violation is detected. | |
1363 // Grabs and releases SystemDictionary_lock | |
1364 // The check_constraints/find_class call and update_dictionary sequence | |
1365 // must be "atomic" for a specific class/classloader pair so we never | |
1366 // define two different instanceKlasses for that class/classloader pair. | |
1367 // Existing classloaders will call define_instance_class with the | |
1368 // classloader lock held | |
1369 // Parallel classloaders will call find_or_define_instance_class | |
1370 // which will require a token to perform the define class | |
1371 symbolHandle name_h(THREAD, k->name()); | |
1372 unsigned int d_hash = dictionary()->compute_hash(name_h, class_loader_h); | |
1373 int d_index = dictionary()->hash_to_index(d_hash); | |
1374 check_constraints(d_index, d_hash, k, class_loader_h, true, CHECK); | |
1375 | |
1376 // Register class just loaded with class loader (placed in Vector) | |
1377 // Note we do this before updating the dictionary, as this can | |
1378 // fail with an OutOfMemoryError (if it does, we will *not* put this | |
1379 // class in the dictionary and will not update the class hierarchy). | |
1380 if (k->class_loader() != NULL) { | |
1381 methodHandle m(THREAD, Universe::loader_addClass_method()); | |
1382 JavaValue result(T_VOID); | |
1383 JavaCallArguments args(class_loader_h); | |
1384 args.push_oop(Handle(THREAD, k->java_mirror())); | |
1385 JavaCalls::call(&result, m, &args, CHECK); | |
1386 } | |
1387 | |
1388 // Add the new class. We need recompile lock during update of CHA. | |
1389 { | |
1390 unsigned int p_hash = placeholders()->compute_hash(name_h, class_loader_h); | |
1391 int p_index = placeholders()->hash_to_index(p_hash); | |
1392 | |
1393 MutexLocker mu_r(Compile_lock, THREAD); | |
1394 | |
1395 // Add to class hierarchy, initialize vtables, and do possible | |
1396 // deoptimizations. | |
1397 add_to_hierarchy(k, CHECK); // No exception, but can block | |
1398 | |
1399 // Add to systemDictionary - so other classes can see it. | |
1400 // Grabs and releases SystemDictionary_lock | |
1401 update_dictionary(d_index, d_hash, p_index, p_hash, | |
1402 k, class_loader_h, THREAD); | |
1403 } | |
1404 k->eager_initialize(THREAD); | |
1405 | |
1406 // notify jvmti | |
1407 if (JvmtiExport::should_post_class_load()) { | |
1408 assert(THREAD->is_Java_thread(), "thread->is_Java_thread()"); | |
1409 JvmtiExport::post_class_load((JavaThread *) THREAD, k()); | |
1410 | |
1411 } | |
1412 } | |
1413 | |
1414 // Support parallel classloading | |
1415 // Initial implementation for bootstrap classloader | |
1416 // For future: | |
1417 // For custom class loaders that support parallel classloading, | |
1418 // in case they do not synchronize around | |
1419 // FindLoadedClass/DefineClass calls, we check for parallel | |
1420 // loading for them, wait if a defineClass is in progress | |
1421 // and return the initial requestor's results | |
1422 // For better performance, the class loaders should synchronize | |
1423 // findClass(), i.e. FindLoadedClass/DefineClass or they | |
1424 // potentially waste time reading and parsing the bytestream. | |
1425 // Note: VM callers should ensure consistency of k/class_name,class_loader | |
1426 instanceKlassHandle SystemDictionary::find_or_define_instance_class(symbolHandle class_name, Handle class_loader, instanceKlassHandle k, TRAPS) { | |
1427 | |
1428 instanceKlassHandle nh = instanceKlassHandle(); // null Handle | |
1429 | |
1430 unsigned int d_hash = dictionary()->compute_hash(class_name, class_loader); | |
1431 int d_index = dictionary()->hash_to_index(d_hash); | |
1432 | |
1433 // Hold SD lock around find_class and placeholder creation for DEFINE_CLASS | |
1434 unsigned int p_hash = placeholders()->compute_hash(class_name, class_loader); | |
1435 int p_index = placeholders()->hash_to_index(p_hash); | |
1436 PlaceholderEntry* probe; | |
1437 | |
1438 { | |
1439 MutexLocker mu(SystemDictionary_lock, THREAD); | |
1440 // First check if class already defined | |
1441 klassOop check = find_class(d_index, d_hash, class_name, class_loader); | |
1442 if (check != NULL) { | |
1443 return(instanceKlassHandle(THREAD, check)); | |
1444 } | |
1445 | |
1446 // Acquire define token for this class/classloader | |
1447 symbolHandle nullsymbolHandle; | |
1448 probe = placeholders()->find_and_add(p_index, p_hash, class_name, class_loader, PlaceholderTable::DEFINE_CLASS, nullsymbolHandle, THREAD); | |
1449 // Check if another thread defining in parallel | |
1450 if (probe->definer() == NULL) { | |
1451 // Thread will define the class | |
1452 probe->set_definer(THREAD); | |
1453 } else { | |
1454 // Wait for defining thread to finish and return results | |
1455 while (probe->definer() != NULL) { | |
1456 SystemDictionary_lock->wait(); | |
1457 } | |
1458 if (probe->instanceKlass() != NULL) { | |
1459 probe->remove_seen_thread(THREAD, PlaceholderTable::DEFINE_CLASS); | |
1460 return(instanceKlassHandle(THREAD, probe->instanceKlass())); | |
1461 } else { | |
1462 // If definer had an error, try again as any new thread would | |
1463 probe->set_definer(THREAD); | |
1464 #ifdef ASSERT | |
1465 klassOop check = find_class(d_index, d_hash, class_name, class_loader); | |
1466 assert(check == NULL, "definer missed recording success"); | |
1467 #endif | |
1468 } | |
1469 } | |
1470 } | |
1471 | |
1472 define_instance_class(k, THREAD); | |
1473 | |
1474 Handle linkage_exception = Handle(); // null handle | |
1475 | |
1476 // definer must notify any waiting threads | |
1477 { | |
1478 MutexLocker mu(SystemDictionary_lock, THREAD); | |
1479 PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, class_name, class_loader); | |
1480 assert(probe != NULL, "DEFINE_CLASS placeholder lost?"); | |
1481 if (probe != NULL) { | |
1482 if (HAS_PENDING_EXCEPTION) { | |
1483 linkage_exception = Handle(THREAD,PENDING_EXCEPTION); | |
1484 CLEAR_PENDING_EXCEPTION; | |
1485 } else { | |
1486 probe->set_instanceKlass(k()); | |
1487 } | |
1488 probe->set_definer(NULL); | |
1489 probe->remove_seen_thread(THREAD, PlaceholderTable::DEFINE_CLASS); | |
1490 SystemDictionary_lock->notify_all(); | |
1491 } | |
1492 } | |
1493 | |
1494 // Can't throw exception while holding lock due to rank ordering | |
1495 if (linkage_exception() != NULL) { | |
1496 THROW_OOP_(linkage_exception(), nh); // throws exception and returns | |
1497 } | |
1498 | |
1499 return k; | |
1500 } | |
1501 | |
1502 Handle SystemDictionary::compute_loader_lock_object(Handle class_loader, TRAPS) { | |
1503 // If class_loader is NULL we synchronize on _system_loader_lock_obj | |
1504 if (class_loader.is_null()) { | |
1505 return Handle(THREAD, _system_loader_lock_obj); | |
1506 } else { | |
1507 return class_loader; | |
1508 } | |
1509 } | |
1510 | |
1511 // This method is added to check how often we have to wait to grab loader | |
1512 // lock. The results are being recorded in the performance counters defined in | |
1513 // ClassLoader::_sync_systemLoaderLockContentionRate and | |
1514 // ClassLoader::_sync_nonSystemLoaderLockConteionRate. | |
1515 void SystemDictionary::check_loader_lock_contention(Handle loader_lock, TRAPS) { | |
1516 if (!UsePerfData) { | |
1517 return; | |
1518 } | |
1519 | |
1520 assert(!loader_lock.is_null(), "NULL lock object"); | |
1521 | |
1522 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader_lock) | |
1523 == ObjectSynchronizer::owner_other) { | |
1524 // contention will likely happen, so increment the corresponding | |
1525 // contention counter. | |
1526 if (loader_lock() == _system_loader_lock_obj) { | |
1527 ClassLoader::sync_systemLoaderLockContentionRate()->inc(); | |
1528 } else { | |
1529 ClassLoader::sync_nonSystemLoaderLockContentionRate()->inc(); | |
1530 } | |
1531 } | |
1532 } | |
1533 | |
1534 // ---------------------------------------------------------------------------- | |
1535 // Lookup | |
1536 | |
1537 klassOop SystemDictionary::find_class(int index, unsigned int hash, | |
1538 symbolHandle class_name, | |
1539 Handle class_loader) { | |
1540 assert_locked_or_safepoint(SystemDictionary_lock); | |
1541 assert (index == dictionary()->index_for(class_name, class_loader), | |
1542 "incorrect index?"); | |
1543 | |
1544 klassOop k = dictionary()->find_class(index, hash, class_name, class_loader); | |
1545 return k; | |
1546 } | |
1547 | |
1548 | |
1549 // Basic find on classes in the midst of being loaded | |
1550 symbolOop SystemDictionary::find_placeholder(int index, unsigned int hash, | |
1551 symbolHandle class_name, | |
1552 Handle class_loader) { | |
1553 assert_locked_or_safepoint(SystemDictionary_lock); | |
1554 | |
1555 return placeholders()->find_entry(index, hash, class_name, class_loader); | |
1556 } | |
1557 | |
1558 | |
1559 // Used for assertions and verification only | |
1560 oop SystemDictionary::find_class_or_placeholder(symbolHandle class_name, | |
1561 Handle class_loader) { | |
1562 #ifndef ASSERT | |
1563 guarantee(VerifyBeforeGC || | |
1564 VerifyDuringGC || | |
1565 VerifyBeforeExit || | |
1566 VerifyAfterGC, "too expensive"); | |
1567 #endif | |
1568 assert_locked_or_safepoint(SystemDictionary_lock); | |
1569 symbolOop class_name_ = class_name(); | |
1570 oop class_loader_ = class_loader(); | |
1571 | |
1572 // First look in the loaded class array | |
1573 unsigned int d_hash = dictionary()->compute_hash(class_name, class_loader); | |
1574 int d_index = dictionary()->hash_to_index(d_hash); | |
1575 oop lookup = find_class(d_index, d_hash, class_name, class_loader); | |
1576 | |
1577 if (lookup == NULL) { | |
1578 // Next try the placeholders | |
1579 unsigned int p_hash = placeholders()->compute_hash(class_name,class_loader); | |
1580 int p_index = placeholders()->hash_to_index(p_hash); | |
1581 lookup = find_placeholder(p_index, p_hash, class_name, class_loader); | |
1582 } | |
1583 | |
1584 return lookup; | |
1585 } | |
1586 | |
1587 | |
1588 // Get the next class in the diictionary. | |
1589 klassOop SystemDictionary::try_get_next_class() { | |
1590 return dictionary()->try_get_next_class(); | |
1591 } | |
1592 | |
1593 | |
1594 // ---------------------------------------------------------------------------- | |
1595 // Update hierachy. This is done before the new klass has been added to the SystemDictionary. The Recompile_lock | |
1596 // is held, to ensure that the compiler is not using the class hierachy, and that deoptimization will kick in | |
1597 // before a new class is used. | |
1598 | |
1599 void SystemDictionary::add_to_hierarchy(instanceKlassHandle k, TRAPS) { | |
1600 assert(k.not_null(), "just checking"); | |
1601 // Link into hierachy. Make sure the vtables are initialized before linking into | |
1602 k->append_to_sibling_list(); // add to superklass/sibling list | |
1603 k->process_interfaces(THREAD); // handle all "implements" declarations | |
1604 k->set_init_state(instanceKlass::loaded); | |
1605 // Now flush all code that depended on old class hierarchy. | |
1606 // Note: must be done *after* linking k into the hierarchy (was bug 12/9/97) | |
1607 // Also, first reinitialize vtable because it may have gotten out of synch | |
1608 // while the new class wasn't connected to the class hierarchy. | |
1609 Universe::flush_dependents_on(k); | |
1610 } | |
1611 | |
1612 | |
1613 // ---------------------------------------------------------------------------- | |
1614 // GC support | |
1615 | |
1616 // Following roots during mark-sweep is separated in two phases. | |
1617 // | |
1618 // The first phase follows preloaded classes and all other system | |
1619 // classes, since these will never get unloaded anyway. | |
1620 // | |
1621 // The second phase removes (unloads) unreachable classes from the | |
1622 // system dictionary and follows the remaining classes' contents. | |
1623 | |
1624 void SystemDictionary::always_strong_oops_do(OopClosure* blk) { | |
1625 // Follow preloaded classes/mirrors and system loader object | |
1626 blk->do_oop(&_java_system_loader); | |
1627 preloaded_oops_do(blk); | |
1628 always_strong_classes_do(blk); | |
1629 } | |
1630 | |
1631 | |
1632 void SystemDictionary::always_strong_classes_do(OopClosure* blk) { | |
1633 // Follow all system classes and temporary placeholders in dictionary | |
1634 dictionary()->always_strong_classes_do(blk); | |
1635 | |
1636 // Placeholders. These are *always* strong roots, as they | |
1637 // represent classes we're actively loading. | |
1638 placeholders_do(blk); | |
1639 | |
1640 // Loader constraints. We must keep the symbolOop used in the name alive. | |
1641 constraints()->always_strong_classes_do(blk); | |
1642 | |
1643 // Resolution errors keep the symbolOop for the error alive | |
1644 resolution_errors()->always_strong_classes_do(blk); | |
1645 } | |
1646 | |
1647 | |
1648 void SystemDictionary::placeholders_do(OopClosure* blk) { | |
1649 placeholders()->oops_do(blk); | |
1650 } | |
1651 | |
1652 | |
1653 bool SystemDictionary::do_unloading(BoolObjectClosure* is_alive) { | |
1654 bool result = dictionary()->do_unloading(is_alive); | |
1655 constraints()->purge_loader_constraints(is_alive); | |
1656 resolution_errors()->purge_resolution_errors(is_alive); | |
1657 return result; | |
1658 } | |
1659 | |
1660 | |
1661 // The mirrors are scanned by shared_oops_do() which is | |
1662 // not called by oops_do(). In order to process oops in | |
1663 // a necessary order, shared_oops_do() is call by | |
1664 // Universe::oops_do(). | |
1665 void SystemDictionary::oops_do(OopClosure* f) { | |
1666 // Adjust preloaded classes and system loader object | |
1667 f->do_oop(&_java_system_loader); | |
1668 preloaded_oops_do(f); | |
1669 | |
1670 lazily_loaded_oops_do(f); | |
1671 | |
1672 // Adjust dictionary | |
1673 dictionary()->oops_do(f); | |
1674 | |
1675 // Partially loaded classes | |
1676 placeholders()->oops_do(f); | |
1677 | |
1678 // Adjust constraint table | |
1679 constraints()->oops_do(f); | |
1680 | |
1681 // Adjust resolution error table | |
1682 resolution_errors()->oops_do(f); | |
1683 } | |
1684 | |
1685 | |
1686 void SystemDictionary::preloaded_oops_do(OopClosure* f) { | |
1687 f->do_oop((oop*) &_string_klass); | |
1688 f->do_oop((oop*) &_object_klass); | |
1689 f->do_oop((oop*) &_class_klass); | |
1690 f->do_oop((oop*) &_cloneable_klass); | |
1691 f->do_oop((oop*) &_classloader_klass); | |
1692 f->do_oop((oop*) &_serializable_klass); | |
1693 f->do_oop((oop*) &_system_klass); | |
1694 | |
1695 f->do_oop((oop*) &_throwable_klass); | |
1696 f->do_oop((oop*) &_error_klass); | |
1697 f->do_oop((oop*) &_threaddeath_klass); | |
1698 f->do_oop((oop*) &_exception_klass); | |
1699 f->do_oop((oop*) &_runtime_exception_klass); | |
1700 f->do_oop((oop*) &_classNotFoundException_klass); | |
1701 f->do_oop((oop*) &_noClassDefFoundError_klass); | |
1702 f->do_oop((oop*) &_linkageError_klass); | |
1703 f->do_oop((oop*) &_classCastException_klass); | |
1704 f->do_oop((oop*) &_arrayStoreException_klass); | |
1705 f->do_oop((oop*) &_virtualMachineError_klass); | |
1706 f->do_oop((oop*) &_outOfMemoryError_klass); | |
1707 f->do_oop((oop*) &_StackOverflowError_klass); | |
1708 f->do_oop((oop*) &_illegalMonitorStateException_klass); | |
1709 f->do_oop((oop*) &_protectionDomain_klass); | |
1710 f->do_oop((oop*) &_AccessControlContext_klass); | |
1711 | |
1712 f->do_oop((oop*) &_reference_klass); | |
1713 f->do_oop((oop*) &_soft_reference_klass); | |
1714 f->do_oop((oop*) &_weak_reference_klass); | |
1715 f->do_oop((oop*) &_final_reference_klass); | |
1716 f->do_oop((oop*) &_phantom_reference_klass); | |
1717 f->do_oop((oop*) &_finalizer_klass); | |
1718 | |
1719 f->do_oop((oop*) &_thread_klass); | |
1720 f->do_oop((oop*) &_threadGroup_klass); | |
1721 f->do_oop((oop*) &_properties_klass); | |
1722 f->do_oop((oop*) &_reflect_accessible_object_klass); | |
1723 f->do_oop((oop*) &_reflect_field_klass); | |
1724 f->do_oop((oop*) &_reflect_method_klass); | |
1725 f->do_oop((oop*) &_reflect_constructor_klass); | |
1726 f->do_oop((oop*) &_reflect_magic_klass); | |
1727 f->do_oop((oop*) &_reflect_method_accessor_klass); | |
1728 f->do_oop((oop*) &_reflect_constructor_accessor_klass); | |
1729 f->do_oop((oop*) &_reflect_delegating_classloader_klass); | |
1730 f->do_oop((oop*) &_reflect_constant_pool_klass); | |
1731 f->do_oop((oop*) &_reflect_unsafe_static_field_accessor_impl_klass); | |
1732 | |
1733 f->do_oop((oop*) &_stringBuffer_klass); | |
1734 f->do_oop((oop*) &_vector_klass); | |
1735 f->do_oop((oop*) &_hashtable_klass); | |
1736 | |
1737 f->do_oop((oop*) &_stackTraceElement_klass); | |
1738 | |
1739 f->do_oop((oop*) &_java_nio_Buffer_klass); | |
1740 | |
1741 f->do_oop((oop*) &_sun_misc_AtomicLongCSImpl_klass); | |
1742 f->do_oop((oop*) &_sun_jkernel_DownloadManager_klass); | |
1743 | |
1744 f->do_oop((oop*) &_boolean_klass); | |
1745 f->do_oop((oop*) &_char_klass); | |
1746 f->do_oop((oop*) &_float_klass); | |
1747 f->do_oop((oop*) &_double_klass); | |
1748 f->do_oop((oop*) &_byte_klass); | |
1749 f->do_oop((oop*) &_short_klass); | |
1750 f->do_oop((oop*) &_int_klass); | |
1751 f->do_oop((oop*) &_long_klass); | |
1752 { | |
1753 for (int i = 0; i < T_VOID+1; i++) { | |
1754 if (_box_klasses[i] != NULL) { | |
1755 assert(i >= T_BOOLEAN, "checking"); | |
1756 f->do_oop((oop*) &_box_klasses[i]); | |
1757 } | |
1758 } | |
1759 } | |
1760 | |
1761 // The basic type mirrors would have already been processed in | |
1762 // Universe::oops_do(), via a call to shared_oops_do(), so should | |
1763 // not be processed again. | |
1764 | |
1765 f->do_oop((oop*) &_system_loader_lock_obj); | |
1766 FilteredFieldsMap::klasses_oops_do(f); | |
1767 } | |
1768 | |
1769 void SystemDictionary::lazily_loaded_oops_do(OopClosure* f) { | |
1770 f->do_oop((oop*) &_abstract_ownable_synchronizer_klass); | |
1771 } | |
1772 | |
1773 // Just the classes from defining class loaders | |
1774 // Don't iterate over placeholders | |
1775 void SystemDictionary::classes_do(void f(klassOop)) { | |
1776 dictionary()->classes_do(f); | |
1777 } | |
1778 | |
1779 // Added for initialize_itable_for_klass | |
1780 // Just the classes from defining class loaders | |
1781 // Don't iterate over placeholders | |
1782 void SystemDictionary::classes_do(void f(klassOop, TRAPS), TRAPS) { | |
1783 dictionary()->classes_do(f, CHECK); | |
1784 } | |
1785 | |
1786 // All classes, and their class loaders | |
1787 // Don't iterate over placeholders | |
1788 void SystemDictionary::classes_do(void f(klassOop, oop)) { | |
1789 dictionary()->classes_do(f); | |
1790 } | |
1791 | |
1792 // All classes, and their class loaders | |
1793 // (added for helpers that use HandleMarks and ResourceMarks) | |
1794 // Don't iterate over placeholders | |
1795 void SystemDictionary::classes_do(void f(klassOop, oop, TRAPS), TRAPS) { | |
1796 dictionary()->classes_do(f, CHECK); | |
1797 } | |
1798 | |
1799 void SystemDictionary::placeholders_do(void f(symbolOop, oop)) { | |
1800 placeholders()->entries_do(f); | |
1801 } | |
1802 | |
1803 void SystemDictionary::methods_do(void f(methodOop)) { | |
1804 dictionary()->methods_do(f); | |
1805 } | |
1806 | |
1807 // ---------------------------------------------------------------------------- | |
1808 // Lazily load klasses | |
1809 | |
1810 void SystemDictionary::load_abstract_ownable_synchronizer_klass(TRAPS) { | |
1811 assert(JDK_Version::is_gte_jdk16x_version(), "Must be JDK 1.6 or later"); | |
1812 | |
1813 // if multiple threads calling this function, only one thread will load | |
1814 // the class. The other threads will find the loaded version once the | |
1815 // class is loaded. | |
1816 klassOop aos = _abstract_ownable_synchronizer_klass; | |
1817 if (aos == NULL) { | |
1818 klassOop k = resolve_or_fail(vmSymbolHandles::java_util_concurrent_locks_AbstractOwnableSynchronizer(), true, CHECK); | |
1819 // Force a fence to prevent any read before the write completes | |
1820 OrderAccess::fence(); | |
1821 _abstract_ownable_synchronizer_klass = k; | |
1822 } | |
1823 } | |
1824 | |
1825 // ---------------------------------------------------------------------------- | |
1826 // Initialization | |
1827 | |
1828 void SystemDictionary::initialize(TRAPS) { | |
1829 // Allocate arrays | |
1830 assert(dictionary() == NULL, | |
1831 "SystemDictionary should only be initialized once"); | |
1832 _dictionary = new Dictionary(_nof_buckets); | |
1833 _placeholders = new PlaceholderTable(_nof_buckets); | |
1834 _number_of_modifications = 0; | |
1835 _loader_constraints = new LoaderConstraintTable(_loader_constraint_size); | |
1836 _resolution_errors = new ResolutionErrorTable(_resolution_error_size); | |
1837 | |
1838 // Allocate private object used as system class loader lock | |
1839 _system_loader_lock_obj = oopFactory::new_system_objArray(0, CHECK); | |
1840 // Initialize basic classes | |
1841 initialize_preloaded_classes(CHECK); | |
1842 } | |
1843 | |
1844 | |
1845 void SystemDictionary::initialize_preloaded_classes(TRAPS) { | |
1846 assert(_object_klass == NULL, "preloaded classes should only be initialized once"); | |
1847 // Preload commonly used klasses | |
1848 _object_klass = resolve_or_fail(vmSymbolHandles::java_lang_Object(), true, CHECK); | |
1849 _string_klass = resolve_or_fail(vmSymbolHandles::java_lang_String(), true, CHECK); | |
1850 _class_klass = resolve_or_fail(vmSymbolHandles::java_lang_Class(), true, CHECK); | |
1851 debug_only(instanceKlass::verify_class_klass_nonstatic_oop_maps(_class_klass)); | |
1852 // Fixup mirrors for classes loaded before java.lang.Class. | |
1853 // These calls iterate over the objects currently in the perm gen | |
1854 // so calling them at this point is matters (not before when there | |
1855 // are fewer objects and not later after there are more objects | |
1856 // in the perm gen. | |
1857 Universe::initialize_basic_type_mirrors(CHECK); | |
1858 Universe::fixup_mirrors(CHECK); | |
1859 | |
1860 _cloneable_klass = resolve_or_fail(vmSymbolHandles::java_lang_Cloneable(), true, CHECK); | |
1861 _classloader_klass = resolve_or_fail(vmSymbolHandles::java_lang_ClassLoader(), true, CHECK); | |
1862 _serializable_klass = resolve_or_fail(vmSymbolHandles::java_io_Serializable(), true, CHECK); | |
1863 _system_klass = resolve_or_fail(vmSymbolHandles::java_lang_System(), true, CHECK); | |
1864 | |
1865 _throwable_klass = resolve_or_fail(vmSymbolHandles::java_lang_Throwable(), true, CHECK); | |
1866 _error_klass = resolve_or_fail(vmSymbolHandles::java_lang_Error(), true, CHECK); | |
1867 _threaddeath_klass = resolve_or_fail(vmSymbolHandles::java_lang_ThreadDeath(), true, CHECK); | |
1868 _exception_klass = resolve_or_fail(vmSymbolHandles::java_lang_Exception(), true, CHECK); | |
1869 _runtime_exception_klass = resolve_or_fail(vmSymbolHandles::java_lang_RuntimeException(), true, CHECK); | |
1870 _protectionDomain_klass = resolve_or_fail(vmSymbolHandles::java_security_ProtectionDomain(), true, CHECK); | |
1871 _AccessControlContext_klass = resolve_or_fail(vmSymbolHandles::java_security_AccessControlContext(), true, CHECK); | |
1872 _classNotFoundException_klass = resolve_or_fail(vmSymbolHandles::java_lang_ClassNotFoundException(), true, CHECK); | |
1873 _noClassDefFoundError_klass = resolve_or_fail(vmSymbolHandles::java_lang_NoClassDefFoundError(), true, CHECK); | |
1874 _linkageError_klass = resolve_or_fail(vmSymbolHandles::java_lang_LinkageError(), true, CHECK); | |
1875 _classCastException_klass = resolve_or_fail(vmSymbolHandles::java_lang_ClassCastException(), true, CHECK); | |
1876 _arrayStoreException_klass = resolve_or_fail(vmSymbolHandles::java_lang_ArrayStoreException(), true, CHECK); | |
1877 _virtualMachineError_klass = resolve_or_fail(vmSymbolHandles::java_lang_VirtualMachineError(), true, CHECK); | |
1878 _outOfMemoryError_klass = resolve_or_fail(vmSymbolHandles::java_lang_OutOfMemoryError(), true, CHECK); | |
1879 _StackOverflowError_klass = resolve_or_fail(vmSymbolHandles::java_lang_StackOverflowError(), true, CHECK); | |
1880 _illegalMonitorStateException_klass = resolve_or_fail(vmSymbolHandles::java_lang_IllegalMonitorStateException(), true, CHECK); | |
1881 | |
1882 // Preload ref klasses and set reference types | |
1883 _reference_klass = resolve_or_fail(vmSymbolHandles::java_lang_ref_Reference(), true, CHECK); | |
1884 instanceKlass::cast(_reference_klass)->set_reference_type(REF_OTHER); | |
1885 instanceRefKlass::update_nonstatic_oop_maps(_reference_klass); | |
1886 | |
1887 _soft_reference_klass = resolve_or_fail(vmSymbolHandles::java_lang_ref_SoftReference(), true, CHECK); | |
1888 instanceKlass::cast(_soft_reference_klass)->set_reference_type(REF_SOFT); | |
1889 _weak_reference_klass = resolve_or_fail(vmSymbolHandles::java_lang_ref_WeakReference(), true, CHECK); | |
1890 instanceKlass::cast(_weak_reference_klass)->set_reference_type(REF_WEAK); | |
1891 _final_reference_klass = resolve_or_fail(vmSymbolHandles::java_lang_ref_FinalReference(), true, CHECK); | |
1892 instanceKlass::cast(_final_reference_klass)->set_reference_type(REF_FINAL); | |
1893 _phantom_reference_klass = resolve_or_fail(vmSymbolHandles::java_lang_ref_PhantomReference(), true, CHECK); | |
1894 instanceKlass::cast(_phantom_reference_klass)->set_reference_type(REF_PHANTOM); | |
1895 _finalizer_klass = resolve_or_fail(vmSymbolHandles::java_lang_ref_Finalizer(), true, CHECK); | |
1896 | |
1897 _thread_klass = resolve_or_fail(vmSymbolHandles::java_lang_Thread(), true, CHECK); | |
1898 _threadGroup_klass = resolve_or_fail(vmSymbolHandles::java_lang_ThreadGroup(), true, CHECK); | |
1899 _properties_klass = resolve_or_fail(vmSymbolHandles::java_util_Properties(), true, CHECK); | |
1900 _reflect_accessible_object_klass = resolve_or_fail(vmSymbolHandles::java_lang_reflect_AccessibleObject(), true, CHECK); | |
1901 _reflect_field_klass = resolve_or_fail(vmSymbolHandles::java_lang_reflect_Field(), true, CHECK); | |
1902 _reflect_method_klass = resolve_or_fail(vmSymbolHandles::java_lang_reflect_Method(), true, CHECK); | |
1903 _reflect_constructor_klass = resolve_or_fail(vmSymbolHandles::java_lang_reflect_Constructor(), true, CHECK); | |
1904 // Universe::is_gte_jdk14x_version() is not set up by this point. | |
1905 // It's okay if these turn out to be NULL in non-1.4 JDKs. | |
1906 _reflect_magic_klass = resolve_or_null(vmSymbolHandles::sun_reflect_MagicAccessorImpl(), CHECK); | |
1907 _reflect_method_accessor_klass = resolve_or_null(vmSymbolHandles::sun_reflect_MethodAccessorImpl(), CHECK); | |
1908 _reflect_constructor_accessor_klass = resolve_or_null(vmSymbolHandles::sun_reflect_ConstructorAccessorImpl(), CHECK); | |
1909 _reflect_delegating_classloader_klass = resolve_or_null(vmSymbolHandles::sun_reflect_DelegatingClassLoader(), CHECK); | |
1910 _reflect_constant_pool_klass = resolve_or_null(vmSymbolHandles::sun_reflect_ConstantPool(), CHECK); | |
1911 _reflect_unsafe_static_field_accessor_impl_klass = resolve_or_null(vmSymbolHandles::sun_reflect_UnsafeStaticFieldAccessorImpl(), CHECK); | |
1912 | |
1913 _vector_klass = resolve_or_fail(vmSymbolHandles::java_util_Vector(), true, CHECK); | |
1914 _hashtable_klass = resolve_or_fail(vmSymbolHandles::java_util_Hashtable(), true, CHECK); | |
1915 _stringBuffer_klass = resolve_or_fail(vmSymbolHandles::java_lang_StringBuffer(), true, CHECK); | |
1916 | |
1917 // It's NULL in non-1.4 JDKs. | |
1918 _stackTraceElement_klass = resolve_or_null(vmSymbolHandles::java_lang_StackTraceElement(), CHECK); | |
1919 | |
1920 // Universe::is_gte_jdk14x_version() is not set up by this point. | |
1921 // It's okay if this turns out to be NULL in non-1.4 JDKs. | |
1922 _java_nio_Buffer_klass = resolve_or_null(vmSymbolHandles::java_nio_Buffer(), CHECK); | |
1923 | |
1924 // If this class isn't present, it won't be referenced. | |
1925 _sun_misc_AtomicLongCSImpl_klass = resolve_or_null(vmSymbolHandles::sun_misc_AtomicLongCSImpl(), CHECK); | |
1926 #ifdef KERNEL | |
1927 _sun_jkernel_DownloadManager_klass = resolve_or_null(vmSymbolHandles::sun_jkernel_DownloadManager(), CHECK); | |
1928 if (_sun_jkernel_DownloadManager_klass == NULL) { | |
1929 warning("Cannot find sun/jkernel/DownloadManager"); | |
1930 } | |
1931 #endif // KERNEL | |
1932 | |
1933 // Preload boxing klasses | |
1934 _boolean_klass = resolve_or_fail(vmSymbolHandles::java_lang_Boolean(), true, CHECK); | |
1935 _char_klass = resolve_or_fail(vmSymbolHandles::java_lang_Character(), true, CHECK); | |
1936 _float_klass = resolve_or_fail(vmSymbolHandles::java_lang_Float(), true, CHECK); | |
1937 _double_klass = resolve_or_fail(vmSymbolHandles::java_lang_Double(), true, CHECK); | |
1938 _byte_klass = resolve_or_fail(vmSymbolHandles::java_lang_Byte(), true, CHECK); | |
1939 _short_klass = resolve_or_fail(vmSymbolHandles::java_lang_Short(), true, CHECK); | |
1940 _int_klass = resolve_or_fail(vmSymbolHandles::java_lang_Integer(), true, CHECK); | |
1941 _long_klass = resolve_or_fail(vmSymbolHandles::java_lang_Long(), true, CHECK); | |
1942 | |
1943 _box_klasses[T_BOOLEAN] = _boolean_klass; | |
1944 _box_klasses[T_CHAR] = _char_klass; | |
1945 _box_klasses[T_FLOAT] = _float_klass; | |
1946 _box_klasses[T_DOUBLE] = _double_klass; | |
1947 _box_klasses[T_BYTE] = _byte_klass; | |
1948 _box_klasses[T_SHORT] = _short_klass; | |
1949 _box_klasses[T_INT] = _int_klass; | |
1950 _box_klasses[T_LONG] = _long_klass; | |
1951 //_box_klasses[T_OBJECT] = _object_klass; | |
1952 //_box_klasses[T_ARRAY] = _object_klass; | |
1953 | |
1954 { // Compute whether we should use loadClass or loadClassInternal when loading classes. | |
1955 methodOop method = instanceKlass::cast(classloader_klass())->find_method(vmSymbols::loadClassInternal_name(), vmSymbols::string_class_signature()); | |
1956 _has_loadClassInternal = (method != NULL); | |
1957 } | |
1958 | |
1959 { // Compute whether we should use checkPackageAccess or NOT | |
1960 methodOop method = instanceKlass::cast(classloader_klass())->find_method(vmSymbols::checkPackageAccess_name(), vmSymbols::class_protectiondomain_signature()); | |
1961 _has_checkPackageAccess = (method != NULL); | |
1962 } | |
1963 } | |
1964 | |
1965 // Tells if a given klass is a box (wrapper class, such as java.lang.Integer). | |
1966 // If so, returns the basic type it holds. If not, returns T_OBJECT. | |
1967 BasicType SystemDictionary::box_klass_type(klassOop k) { | |
1968 assert(k != NULL, ""); | |
1969 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { | |
1970 if (_box_klasses[i] == k) | |
1971 return (BasicType)i; | |
1972 } | |
1973 return T_OBJECT; | |
1974 } | |
1975 | |
1976 // Constraints on class loaders. The details of the algorithm can be | |
1977 // found in the OOPSLA'98 paper "Dynamic Class Loading in the Java | |
1978 // Virtual Machine" by Sheng Liang and Gilad Bracha. The basic idea is | |
1979 // that the system dictionary needs to maintain a set of contraints that | |
1980 // must be satisfied by all classes in the dictionary. | |
1981 // if defining is true, then LinkageError if already in systemDictionary | |
1982 // if initiating loader, then ok if instanceKlass matches existing entry | |
1983 | |
1984 void SystemDictionary::check_constraints(int d_index, unsigned int d_hash, | |
1985 instanceKlassHandle k, | |
1986 Handle class_loader, bool defining, | |
1987 TRAPS) { | |
1988 const char *linkage_error = NULL; | |
1989 { | |
1990 symbolHandle name (THREAD, k->name()); | |
1991 MutexLocker mu(SystemDictionary_lock, THREAD); | |
1992 | |
1993 klassOop check = find_class(d_index, d_hash, name, class_loader); | |
1994 if (check != (klassOop)NULL) { | |
1995 // if different instanceKlass - duplicate class definition, | |
1996 // else - ok, class loaded by a different thread in parallel, | |
1997 // we should only have found it if it was done loading and ok to use | |
1998 // system dictionary only holds instance classes, placeholders | |
1999 // also holds array classes | |
2000 | |
2001 assert(check->klass_part()->oop_is_instance(), "noninstance in systemdictionary"); | |
2002 if ((defining == true) || (k() != check)) { | |
2003 linkage_error = "loader (instance of %s): attempted duplicate class " | |
2004 "definition for name: \"%s\""; | |
2005 } else { | |
2006 return; | |
2007 } | |
2008 } | |
2009 | |
2010 #ifdef ASSERT | |
2011 unsigned int p_hash = placeholders()->compute_hash(name, class_loader); | |
2012 int p_index = placeholders()->hash_to_index(p_hash); | |
2013 symbolOop ph_check = find_placeholder(p_index, p_hash, name, class_loader); | |
2014 assert(ph_check == NULL || ph_check == name(), "invalid symbol"); | |
2015 #endif | |
2016 | |
2017 if (linkage_error == NULL) { | |
2018 if (constraints()->check_or_update(k, class_loader, name) == false) { | |
2019 linkage_error = "loader constraint violation: loader (instance of %s)" | |
2020 " previously initiated loading for a different type with name \"%s\""; | |
2021 } | |
2022 } | |
2023 } | |
2024 | |
2025 // Throw error now if needed (cannot throw while holding | |
2026 // SystemDictionary_lock because of rank ordering) | |
2027 | |
2028 if (linkage_error) { | |
2029 ResourceMark rm(THREAD); | |
2030 const char* class_loader_name = loader_name(class_loader()); | |
2031 char* type_name = k->name()->as_C_string(); | |
2032 size_t buflen = strlen(linkage_error) + strlen(class_loader_name) + | |
2033 strlen(type_name); | |
2034 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
2035 jio_snprintf(buf, buflen, linkage_error, class_loader_name, type_name); | |
2036 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); | |
2037 } | |
2038 } | |
2039 | |
2040 | |
2041 // Update system dictionary - done after check_constraint and add_to_hierachy | |
2042 // have been called. | |
2043 void SystemDictionary::update_dictionary(int d_index, unsigned int d_hash, | |
2044 int p_index, unsigned int p_hash, | |
2045 instanceKlassHandle k, | |
2046 Handle class_loader, | |
2047 TRAPS) { | |
2048 // Compile_lock prevents systemDictionary updates during compilations | |
2049 assert_locked_or_safepoint(Compile_lock); | |
2050 symbolHandle name (THREAD, k->name()); | |
2051 | |
2052 { | |
2053 MutexLocker mu1(SystemDictionary_lock, THREAD); | |
2054 | |
2055 // See whether biased locking is enabled and if so set it for this | |
2056 // klass. | |
2057 // Note that this must be done past the last potential blocking | |
2058 // point / safepoint. We enable biased locking lazily using a | |
2059 // VM_Operation to iterate the SystemDictionary and installing the | |
2060 // biasable mark word into each instanceKlass's prototype header. | |
2061 // To avoid race conditions where we accidentally miss enabling the | |
2062 // optimization for one class in the process of being added to the | |
2063 // dictionary, we must not safepoint after the test of | |
2064 // BiasedLocking::enabled(). | |
2065 if (UseBiasedLocking && BiasedLocking::enabled()) { | |
2066 // Set biased locking bit for all loaded classes; it will be | |
2067 // cleared if revocation occurs too often for this type | |
2068 // NOTE that we must only do this when the class is initally | |
2069 // defined, not each time it is referenced from a new class loader | |
2070 if (k->class_loader() == class_loader()) { | |
2071 k->set_prototype_header(markOopDesc::biased_locking_prototype()); | |
2072 } | |
2073 } | |
2074 | |
2075 // Check for a placeholder. If there, remove it and make a | |
2076 // new system dictionary entry. | |
2077 placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD); | |
2078 klassOop sd_check = find_class(d_index, d_hash, name, class_loader); | |
2079 if (sd_check == NULL) { | |
2080 dictionary()->add_klass(name, class_loader, k); | |
2081 notice_modification(); | |
2082 } | |
2083 #ifdef ASSERT | |
2084 sd_check = find_class(d_index, d_hash, name, class_loader); | |
2085 assert (sd_check != NULL, "should have entry in system dictionary"); | |
2086 // Changed to allow PH to remain to complete class circularity checking | |
2087 // while only one thread can define a class at one time, multiple | |
2088 // classes can resolve the superclass for a class at one time, | |
2089 // and the placeholder is used to track that | |
2090 // symbolOop ph_check = find_placeholder(p_index, p_hash, name, class_loader); | |
2091 // assert (ph_check == NULL, "should not have a placeholder entry"); | |
2092 #endif | |
2093 SystemDictionary_lock->notify_all(); | |
2094 } | |
2095 } | |
2096 | |
2097 | |
2098 klassOop SystemDictionary::find_constrained_instance_or_array_klass( | |
2099 symbolHandle class_name, Handle class_loader, TRAPS) { | |
2100 | |
2101 // First see if it has been loaded directly. | |
2102 // Force the protection domain to be null. (This removes protection checks.) | |
2103 Handle no_protection_domain; | |
2104 klassOop klass = find_instance_or_array_klass(class_name, class_loader, | |
2105 no_protection_domain, CHECK_NULL); | |
2106 if (klass != NULL) | |
2107 return klass; | |
2108 | |
2109 // Now look to see if it has been loaded elsewhere, and is subject to | |
2110 // a loader constraint that would require this loader to return the | |
2111 // klass that is already loaded. | |
2112 if (FieldType::is_array(class_name())) { | |
2113 // Array classes are hard because their klassOops are not kept in the | |
2114 // constraint table. The array klass may be constrained, but the elem class | |
2115 // may not be. | |
2116 jint dimension; | |
2117 symbolOop object_key; | |
2118 BasicType t = FieldType::get_array_info(class_name(), &dimension, | |
2119 &object_key, CHECK_(NULL)); | |
2120 if (t != T_OBJECT) { | |
2121 klass = Universe::typeArrayKlassObj(t); | |
2122 } else { | |
2123 symbolHandle elem_name(THREAD, object_key); | |
2124 MutexLocker mu(SystemDictionary_lock, THREAD); | |
2125 klass = constraints()->find_constrained_elem_klass(class_name, elem_name, class_loader, THREAD); | |
2126 } | |
2127 if (klass != NULL) { | |
2128 klass = Klass::cast(klass)->array_klass_or_null(dimension); | |
2129 } | |
2130 } else { | |
2131 MutexLocker mu(SystemDictionary_lock, THREAD); | |
2132 // Non-array classes are easy: simply check the constraint table. | |
2133 klass = constraints()->find_constrained_klass(class_name, class_loader); | |
2134 } | |
2135 | |
2136 return klass; | |
2137 } | |
2138 | |
2139 | |
2140 bool SystemDictionary::add_loader_constraint(symbolHandle class_name, | |
2141 Handle class_loader1, | |
2142 Handle class_loader2, | |
2143 Thread* THREAD) { | |
2144 unsigned int d_hash1 = dictionary()->compute_hash(class_name, class_loader1); | |
2145 int d_index1 = dictionary()->hash_to_index(d_hash1); | |
2146 | |
2147 unsigned int d_hash2 = dictionary()->compute_hash(class_name, class_loader2); | |
2148 int d_index2 = dictionary()->hash_to_index(d_hash2); | |
2149 | |
2150 { | |
2151 MutexLocker mu_s(SystemDictionary_lock, THREAD); | |
2152 | |
2153 // Better never do a GC while we're holding these oops | |
2154 No_Safepoint_Verifier nosafepoint; | |
2155 | |
2156 klassOop klass1 = find_class(d_index1, d_hash1, class_name, class_loader1); | |
2157 klassOop klass2 = find_class(d_index2, d_hash2, class_name, class_loader2); | |
2158 return constraints()->add_entry(class_name, klass1, class_loader1, | |
2159 klass2, class_loader2); | |
2160 } | |
2161 } | |
2162 | |
2163 // Add entry to resolution error table to record the error when the first | |
2164 // attempt to resolve a reference to a class has failed. | |
2165 void SystemDictionary::add_resolution_error(constantPoolHandle pool, int which, symbolHandle error) { | |
2166 unsigned int hash = resolution_errors()->compute_hash(pool, which); | |
2167 int index = resolution_errors()->hash_to_index(hash); | |
2168 { | |
2169 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
2170 resolution_errors()->add_entry(index, hash, pool, which, error); | |
2171 } | |
2172 } | |
2173 | |
2174 // Lookup resolution error table. Returns error if found, otherwise NULL. | |
2175 symbolOop SystemDictionary::find_resolution_error(constantPoolHandle pool, int which) { | |
2176 unsigned int hash = resolution_errors()->compute_hash(pool, which); | |
2177 int index = resolution_errors()->hash_to_index(hash); | |
2178 { | |
2179 MutexLocker ml(SystemDictionary_lock, Thread::current()); | |
2180 ResolutionErrorEntry* entry = resolution_errors()->find_entry(index, hash, pool, which); | |
2181 return (entry != NULL) ? entry->error() : (symbolOop)NULL; | |
2182 } | |
2183 } | |
2184 | |
2185 | |
2186 // Make sure all class components (including arrays) in the given | |
2187 // signature will be resolved to the same class in both loaders. | |
2188 // Returns the name of the type that failed a loader constraint check, or | |
2189 // NULL if no constraint failed. The returned C string needs cleaning up | |
2190 // with a ResourceMark in the caller | |
2191 char* SystemDictionary::check_signature_loaders(symbolHandle signature, | |
2192 Handle loader1, Handle loader2, | |
2193 bool is_method, TRAPS) { | |
2194 // Nothing to do if loaders are the same. | |
2195 if (loader1() == loader2()) { | |
2196 return NULL; | |
2197 } | |
2198 | |
2199 SignatureStream sig_strm(signature, is_method); | |
2200 while (!sig_strm.is_done()) { | |
2201 if (sig_strm.is_object()) { | |
2202 symbolOop s = sig_strm.as_symbol(CHECK_NULL); | |
2203 symbolHandle sig (THREAD, s); | |
2204 if (!add_loader_constraint(sig, loader1, loader2, THREAD)) { | |
2205 return sig()->as_C_string(); | |
2206 } | |
2207 } | |
2208 sig_strm.next(); | |
2209 } | |
2210 return NULL; | |
2211 } | |
2212 | |
2213 | |
2214 // Since the identity hash code for symbols changes when the symbols are | |
2215 // moved from the regular perm gen (hash in the mark word) to the shared | |
2216 // spaces (hash is the address), the classes loaded into the dictionary | |
2217 // may be in the wrong buckets. | |
2218 | |
2219 void SystemDictionary::reorder_dictionary() { | |
2220 dictionary()->reorder_dictionary(); | |
2221 } | |
2222 | |
2223 | |
2224 void SystemDictionary::copy_buckets(char** top, char* end) { | |
2225 dictionary()->copy_buckets(top, end); | |
2226 } | |
2227 | |
2228 | |
2229 void SystemDictionary::copy_table(char** top, char* end) { | |
2230 dictionary()->copy_table(top, end); | |
2231 } | |
2232 | |
2233 | |
2234 void SystemDictionary::reverse() { | |
2235 dictionary()->reverse(); | |
2236 } | |
2237 | |
2238 int SystemDictionary::number_of_classes() { | |
2239 return dictionary()->number_of_entries(); | |
2240 } | |
2241 | |
2242 | |
2243 // ---------------------------------------------------------------------------- | |
2244 #ifndef PRODUCT | |
2245 | |
2246 void SystemDictionary::print() { | |
2247 dictionary()->print(); | |
2248 | |
2249 // Placeholders | |
2250 GCMutexLocker mu(SystemDictionary_lock); | |
2251 placeholders()->print(); | |
2252 | |
2253 // loader constraints - print under SD_lock | |
2254 constraints()->print(); | |
2255 } | |
2256 | |
2257 #endif | |
2258 | |
2259 void SystemDictionary::verify() { | |
2260 guarantee(dictionary() != NULL, "Verify of system dictionary failed"); | |
2261 guarantee(constraints() != NULL, | |
2262 "Verify of loader constraints failed"); | |
2263 guarantee(dictionary()->number_of_entries() >= 0 && | |
2264 placeholders()->number_of_entries() >= 0, | |
2265 "Verify of system dictionary failed"); | |
2266 | |
2267 // Verify dictionary | |
2268 dictionary()->verify(); | |
2269 | |
2270 GCMutexLocker mu(SystemDictionary_lock); | |
2271 placeholders()->verify(); | |
2272 | |
2273 // Verify constraint table | |
2274 guarantee(constraints() != NULL, "Verify of loader constraints failed"); | |
2275 constraints()->verify(dictionary()); | |
2276 } | |
2277 | |
2278 | |
2279 void SystemDictionary::verify_obj_klass_present(Handle obj, | |
2280 symbolHandle class_name, | |
2281 Handle class_loader) { | |
2282 GCMutexLocker mu(SystemDictionary_lock); | |
2283 oop probe = find_class_or_placeholder(class_name, class_loader); | |
2284 if (probe == NULL) { | |
2285 probe = SystemDictionary::find_shared_class(class_name); | |
2286 } | |
2287 guarantee(probe != NULL && | |
2288 (!probe->is_klass() || probe == obj()), | |
2289 "Loaded klasses should be in SystemDictionary"); | |
2290 } | |
2291 | |
2292 #ifndef PRODUCT | |
2293 | |
2294 // statistics code | |
2295 class ClassStatistics: AllStatic { | |
2296 private: | |
2297 static int nclasses; // number of classes | |
2298 static int nmethods; // number of methods | |
2299 static int nmethoddata; // number of methodData | |
2300 static int class_size; // size of class objects in words | |
2301 static int method_size; // size of method objects in words | |
2302 static int debug_size; // size of debug info in methods | |
2303 static int methoddata_size; // size of methodData objects in words | |
2304 | |
2305 static void do_class(klassOop k) { | |
2306 nclasses++; | |
2307 class_size += k->size(); | |
2308 if (k->klass_part()->oop_is_instance()) { | |
2309 instanceKlass* ik = (instanceKlass*)k->klass_part(); | |
2310 class_size += ik->methods()->size(); | |
2311 class_size += ik->constants()->size(); | |
2312 class_size += ik->local_interfaces()->size(); | |
2313 class_size += ik->transitive_interfaces()->size(); | |
2314 // We do not have to count implementors, since we only store one! | |
2315 class_size += ik->fields()->size(); | |
2316 } | |
2317 } | |
2318 | |
2319 static void do_method(methodOop m) { | |
2320 nmethods++; | |
2321 method_size += m->size(); | |
2322 // class loader uses same objArray for empty vectors, so don't count these | |
2323 if (m->exception_table()->length() != 0) method_size += m->exception_table()->size(); | |
2324 if (m->has_stackmap_table()) { | |
2325 method_size += m->stackmap_data()->size(); | |
2326 } | |
2327 | |
2328 methodDataOop mdo = m->method_data(); | |
2329 if (mdo != NULL) { | |
2330 nmethoddata++; | |
2331 methoddata_size += mdo->size(); | |
2332 } | |
2333 } | |
2334 | |
2335 public: | |
2336 static void print() { | |
2337 SystemDictionary::classes_do(do_class); | |
2338 SystemDictionary::methods_do(do_method); | |
2339 tty->print_cr("Class statistics:"); | |
2340 tty->print_cr("%d classes (%d bytes)", nclasses, class_size * oopSize); | |
2341 tty->print_cr("%d methods (%d bytes = %d base + %d debug info)", nmethods, | |
2342 (method_size + debug_size) * oopSize, method_size * oopSize, debug_size * oopSize); | |
2343 tty->print_cr("%d methoddata (%d bytes)", nmethoddata, methoddata_size * oopSize); | |
2344 } | |
2345 }; | |
2346 | |
2347 | |
2348 int ClassStatistics::nclasses = 0; | |
2349 int ClassStatistics::nmethods = 0; | |
2350 int ClassStatistics::nmethoddata = 0; | |
2351 int ClassStatistics::class_size = 0; | |
2352 int ClassStatistics::method_size = 0; | |
2353 int ClassStatistics::debug_size = 0; | |
2354 int ClassStatistics::methoddata_size = 0; | |
2355 | |
2356 void SystemDictionary::print_class_statistics() { | |
2357 ResourceMark rm; | |
2358 ClassStatistics::print(); | |
2359 } | |
2360 | |
2361 | |
2362 class MethodStatistics: AllStatic { | |
2363 public: | |
2364 enum { | |
2365 max_parameter_size = 10 | |
2366 }; | |
2367 private: | |
2368 | |
2369 static int _number_of_methods; | |
2370 static int _number_of_final_methods; | |
2371 static int _number_of_static_methods; | |
2372 static int _number_of_native_methods; | |
2373 static int _number_of_synchronized_methods; | |
2374 static int _number_of_profiled_methods; | |
2375 static int _number_of_bytecodes; | |
2376 static int _parameter_size_profile[max_parameter_size]; | |
2377 static int _bytecodes_profile[Bytecodes::number_of_java_codes]; | |
2378 | |
2379 static void initialize() { | |
2380 _number_of_methods = 0; | |
2381 _number_of_final_methods = 0; | |
2382 _number_of_static_methods = 0; | |
2383 _number_of_native_methods = 0; | |
2384 _number_of_synchronized_methods = 0; | |
2385 _number_of_profiled_methods = 0; | |
2386 _number_of_bytecodes = 0; | |
2387 for (int i = 0; i < max_parameter_size ; i++) _parameter_size_profile[i] = 0; | |
2388 for (int j = 0; j < Bytecodes::number_of_java_codes; j++) _bytecodes_profile [j] = 0; | |
2389 }; | |
2390 | |
2391 static void do_method(methodOop m) { | |
2392 _number_of_methods++; | |
2393 // collect flag info | |
2394 if (m->is_final() ) _number_of_final_methods++; | |
2395 if (m->is_static() ) _number_of_static_methods++; | |
2396 if (m->is_native() ) _number_of_native_methods++; | |
2397 if (m->is_synchronized()) _number_of_synchronized_methods++; | |
2398 if (m->method_data() != NULL) _number_of_profiled_methods++; | |
2399 // collect parameter size info (add one for receiver, if any) | |
2400 _parameter_size_profile[MIN2(m->size_of_parameters() + (m->is_static() ? 0 : 1), max_parameter_size - 1)]++; | |
2401 // collect bytecodes info | |
2402 { | |
2403 Thread *thread = Thread::current(); | |
2404 HandleMark hm(thread); | |
2405 BytecodeStream s(methodHandle(thread, m)); | |
2406 Bytecodes::Code c; | |
2407 while ((c = s.next()) >= 0) { | |
2408 _number_of_bytecodes++; | |
2409 _bytecodes_profile[c]++; | |
2410 } | |
2411 } | |
2412 } | |
2413 | |
2414 public: | |
2415 static void print() { | |
2416 initialize(); | |
2417 SystemDictionary::methods_do(do_method); | |
2418 // generate output | |
2419 tty->cr(); | |
2420 tty->print_cr("Method statistics (static):"); | |
2421 // flag distribution | |
2422 tty->cr(); | |
2423 tty->print_cr("%6d final methods %6.1f%%", _number_of_final_methods , _number_of_final_methods * 100.0F / _number_of_methods); | |
2424 tty->print_cr("%6d static methods %6.1f%%", _number_of_static_methods , _number_of_static_methods * 100.0F / _number_of_methods); | |
2425 tty->print_cr("%6d native methods %6.1f%%", _number_of_native_methods , _number_of_native_methods * 100.0F / _number_of_methods); | |
2426 tty->print_cr("%6d synchronized methods %6.1f%%", _number_of_synchronized_methods, _number_of_synchronized_methods * 100.0F / _number_of_methods); | |
2427 tty->print_cr("%6d profiled methods %6.1f%%", _number_of_profiled_methods, _number_of_profiled_methods * 100.0F / _number_of_methods); | |
2428 // parameter size profile | |
2429 tty->cr(); | |
2430 { int tot = 0; | |
2431 int avg = 0; | |
2432 for (int i = 0; i < max_parameter_size; i++) { | |
2433 int n = _parameter_size_profile[i]; | |
2434 tot += n; | |
2435 avg += n*i; | |
2436 tty->print_cr("parameter size = %1d: %6d methods %5.1f%%", i, n, n * 100.0F / _number_of_methods); | |
2437 } | |
2438 assert(tot == _number_of_methods, "should be the same"); | |
2439 tty->print_cr(" %6d methods 100.0%%", _number_of_methods); | |
2440 tty->print_cr("(average parameter size = %3.1f including receiver, if any)", (float)avg / _number_of_methods); | |
2441 } | |
2442 // bytecodes profile | |
2443 tty->cr(); | |
2444 { int tot = 0; | |
2445 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) { | |
2446 if (Bytecodes::is_defined(i)) { | |
2447 Bytecodes::Code c = Bytecodes::cast(i); | |
2448 int n = _bytecodes_profile[c]; | |
2449 tot += n; | |
2450 tty->print_cr("%9d %7.3f%% %s", n, n * 100.0F / _number_of_bytecodes, Bytecodes::name(c)); | |
2451 } | |
2452 } | |
2453 assert(tot == _number_of_bytecodes, "should be the same"); | |
2454 tty->print_cr("%9d 100.000%%", _number_of_bytecodes); | |
2455 } | |
2456 tty->cr(); | |
2457 } | |
2458 }; | |
2459 | |
2460 int MethodStatistics::_number_of_methods; | |
2461 int MethodStatistics::_number_of_final_methods; | |
2462 int MethodStatistics::_number_of_static_methods; | |
2463 int MethodStatistics::_number_of_native_methods; | |
2464 int MethodStatistics::_number_of_synchronized_methods; | |
2465 int MethodStatistics::_number_of_profiled_methods; | |
2466 int MethodStatistics::_number_of_bytecodes; | |
2467 int MethodStatistics::_parameter_size_profile[MethodStatistics::max_parameter_size]; | |
2468 int MethodStatistics::_bytecodes_profile[Bytecodes::number_of_java_codes]; | |
2469 | |
2470 | |
2471 void SystemDictionary::print_method_statistics() { | |
2472 MethodStatistics::print(); | |
2473 } | |
2474 | |
2475 #endif // PRODUCT |