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 // The system dictionary stores all loaded classes and maps:
26 //
27 // [class name,class loader] -> class i.e. [symbolOop,oop] -> klassOop
28 //
29 // Classes are loaded lazily. The default VM class loader is
30 // represented as NULL.
31
32 // The underlying data structure is an open hash table with a fixed number
33 // of buckets. During loading the loader object is locked, (for the VM loader
34 // a private lock object is used). Class loading can thus be done concurrently,
35 // but only by different loaders.
36 //
37 // During loading a placeholder (name, loader) is temporarily placed in
38 // a side data structure, and is used to detect ClassCircularityErrors
39 // and to perform verification during GC. A GC can occur in the midst
40 // of class loading, as we call out to Java, have to take locks, etc.
41 //
42 // When class loading is finished, a new entry is added to the system
43 // dictionary and the place holder is removed. Note that the protection
44 // domain field of the system dictionary has not yet been filled in when
45 // the "real" system dictionary entry is created.
46 //
47 // Clients of this class who are interested in finding if a class has
48 // been completely loaded -- not classes in the process of being loaded --
49 // can read the SystemDictionary unlocked. This is safe because
50 // - entries are only deleted at safepoints
51 // - readers cannot come to a safepoint while actively examining
52 // an entry (an entry cannot be deleted from under a reader)
53 // - entries must be fully formed before they are available to concurrent
54 // readers (we must ensure write ordering)
55 //
56 // Note that placeholders are deleted at any time, as they are removed
57 // when a class is completely loaded. Therefore, readers as well as writers
58 // of placeholders must hold the SystemDictionary_lock.
59 //
60
61 class Dictionary;
62 class PlaceholderTable;
63 class LoaderConstraintTable;
64 class HashtableBucket;
65 class ResolutionErrorTable;
66
67 class SystemDictionary : AllStatic {
68 friend class VMStructs;
69 friend class CompactingPermGenGen;
70 NOT_PRODUCT(friend class instanceKlassKlass;)
71
72 public:
73 // Returns a class with a given class name and class loader. Loads the
74 // class if needed. If not found a NoClassDefFoundError or a
75 // ClassNotFoundException is thrown, depending on the value on the
76 // throw_error flag. For most uses the throw_error argument should be set
77 // to true.
78
79 static klassOop resolve_or_fail(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS);
80 // Convenient call for null loader and protection domain.
81 static klassOop resolve_or_fail(symbolHandle class_name, bool throw_error, TRAPS);
82 private:
83 // handle error translation for resolve_or_null results
84 static klassOop handle_resolution_exception(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS);
85
86 public:
87
88 // Returns a class with a given class name and class loader.
89 // Loads the class if needed. If not found NULL is returned.
90 static klassOop resolve_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS);
91 // Version with null loader and protection domain
92 static klassOop resolve_or_null(symbolHandle class_name, TRAPS);
93
94 // Resolve a superclass or superinterface. Called from ClassFileParser,
95 // parse_interfaces, resolve_instance_class_or_null, load_shared_class
96 // "child_name" is the class whose super class or interface is being resolved.
97 static klassOop resolve_super_or_fail(symbolHandle child_name,
98 symbolHandle class_name,
99 Handle class_loader,
100 Handle protection_domain,
101 bool is_superclass,
102 TRAPS);
103
104 // Parse new stream. This won't update the system dictionary or
105 // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses.
106 static klassOop parse_stream(symbolHandle class_name,
107 Handle class_loader,
108 Handle protection_domain,
109 ClassFileStream* st,
110 TRAPS);
111
112 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass)
113 static klassOop resolve_from_stream(symbolHandle class_name, Handle class_loader, Handle protection_domain, ClassFileStream* st, TRAPS);
114
115 // Lookup an already loaded class. If not found NULL is returned.
116 static klassOop find(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS);
117
118 // Lookup an already loaded instance or array class.
119 // Do not make any queries to class loaders; consult only the cache.
120 // If not found NULL is returned.
121 static klassOop find_instance_or_array_klass(symbolHandle class_name,
122 Handle class_loader,
123 Handle protection_domain,
124 TRAPS);
125
126 // Lookup an instance or array class that has already been loaded
127 // either into the given class loader, or else into another class
128 // loader that is constrained (via loader constraints) to produce
129 // a consistent class. Do not take protection domains into account.
130 // Do not make any queries to class loaders; consult only the cache.
131 // Return NULL if the class is not found.
132 //
133 // This function is a strict superset of find_instance_or_array_klass.
134 // This function (the unchecked version) makes a conservative prediction
135 // of the result of the checked version, assuming successful lookup.
136 // If both functions return non-null, they must return the same value.
137 // Also, the unchecked version may sometimes be non-null where the
138 // checked version is null. This can occur in several ways:
139 // 1. No query has yet been made to the class loader.
140 // 2. The class loader was queried, but chose not to delegate.
141 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain.
142 // 4. Loading was attempted, but there was a linkage error of some sort.
143 // In all of these cases, the loader constraints on this type are
144 // satisfied, and it is safe for classes in the given class loader
145 // to manipulate strongly-typed values of the found class, subject
146 // to local linkage and access checks.
147 static klassOop find_constrained_instance_or_array_klass(symbolHandle class_name,
148 Handle class_loader,
149 TRAPS);
150
151 // Iterate over all klasses in dictionary
152 // Just the classes from defining class loaders
153 static void classes_do(void f(klassOop));
154 // Added for initialize_itable_for_klass to handle exceptions
155 static void classes_do(void f(klassOop, TRAPS), TRAPS);
156 // All classes, and their class loaders
157 static void classes_do(void f(klassOop, oop));
158 // All classes, and their class loaders
159 // (added for helpers that use HandleMarks and ResourceMarks)
160 static void classes_do(void f(klassOop, oop, TRAPS), TRAPS);
161 // All entries in the placeholder table and their class loaders
162 static void placeholders_do(void f(symbolOop, oop));
163
164 // Iterate over all methods in all klasses in dictionary
165 static void methods_do(void f(methodOop));
166
167 // Garbage collection support
168
169 // This method applies "blk->do_oop" to all the pointers to "system"
170 // classes and loaders.
171 static void always_strong_oops_do(OopClosure* blk);
172 static void always_strong_classes_do(OopClosure* blk);
173 // This method applies "blk->do_oop" to all the placeholders.
174 static void placeholders_do(OopClosure* blk);
175
176 // Unload (that is, break root links to) all unmarked classes and
177 // loaders. Returns "true" iff something was unloaded.
178 static bool do_unloading(BoolObjectClosure* is_alive);
179
180 // Applies "f->do_oop" to all root oops in the system dictionary.
181 static void oops_do(OopClosure* f);
182
183 // System loader lock
184 static oop system_loader_lock() { return _system_loader_lock_obj; }
185
186 private:
187 // Traverses preloaded oops: various system classes. These are
188 // guaranteed to be in the perm gen.
189 static void preloaded_oops_do(OopClosure* f);
190 static void lazily_loaded_oops_do(OopClosure* f);
191
192 public:
193 // Sharing support.
194 static void reorder_dictionary();
195 static void copy_buckets(char** top, char* end);
196 static void copy_table(char** top, char* end);
197 static void reverse();
198 static void set_shared_dictionary(HashtableBucket* t, int length,
199 int number_of_entries);
200 // Printing
201 static void print() PRODUCT_RETURN;
202 static void print_class_statistics() PRODUCT_RETURN;
203 static void print_method_statistics() PRODUCT_RETURN;
204
205 // Number of contained klasses
206 // This is both fully loaded classes and classes in the process
207 // of being loaded
208 static int number_of_classes();
209
210 // Monotonically increasing counter which grows as classes are
211 // loaded or modifications such as hot-swapping or setting/removing
212 // of breakpoints are performed
213 static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; }
214 // Needed by evolution and breakpoint code
215 static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; }
216
217 // Verification
218 static void verify();
219
220 #ifdef ASSERT
221 static bool is_internal_format(symbolHandle class_name);
222 #endif
223
224 // Verify class is in dictionary
225 static void verify_obj_klass_present(Handle obj,
226 symbolHandle class_name,
227 Handle class_loader);
228
229 // Initialization
230 static void initialize(TRAPS);
231
232 // Fast access to commonly used classes (preloaded)
233 static klassOop check_klass(klassOop k) {
234 assert(k != NULL, "preloaded klass not initialized");
235 return k;
236 }
237
238 public:
239 static klassOop object_klass() { return check_klass(_object_klass); }
240 static klassOop string_klass() { return check_klass(_string_klass); }
241 static klassOop class_klass() { return check_klass(_class_klass); }
242 static klassOop cloneable_klass() { return check_klass(_cloneable_klass); }
243 static klassOop classloader_klass() { return check_klass(_classloader_klass); }
244 static klassOop serializable_klass() { return check_klass(_serializable_klass); }
245 static klassOop system_klass() { return check_klass(_system_klass); }
246
247 static klassOop throwable_klass() { return check_klass(_throwable_klass); }
248 static klassOop error_klass() { return check_klass(_error_klass); }
249 static klassOop threaddeath_klass() { return check_klass(_threaddeath_klass); }
250 static klassOop exception_klass() { return check_klass(_exception_klass); }
251 static klassOop runtime_exception_klass() { return check_klass(_runtime_exception_klass); }
252 static klassOop classNotFoundException_klass() { return check_klass(_classNotFoundException_klass); }
253 static klassOop noClassDefFoundError_klass() { return check_klass(_noClassDefFoundError_klass); }
254 static klassOop linkageError_klass() { return check_klass(_linkageError_klass); }
255 static klassOop ClassCastException_klass() { return check_klass(_classCastException_klass); }
256 static klassOop ArrayStoreException_klass() { return check_klass(_arrayStoreException_klass); }
257 static klassOop virtualMachineError_klass() { return check_klass(_virtualMachineError_klass); }
258 static klassOop OutOfMemoryError_klass() { return check_klass(_outOfMemoryError_klass); }
259 static klassOop StackOverflowError_klass() { return check_klass(_StackOverflowError_klass); }
260 static klassOop IllegalMonitorStateException_klass() { return check_klass(_illegalMonitorStateException_klass); }
261 static klassOop protectionDomain_klass() { return check_klass(_protectionDomain_klass); }
262 static klassOop AccessControlContext_klass() { return check_klass(_AccessControlContext_klass); }
263 static klassOop reference_klass() { return check_klass(_reference_klass); }
264 static klassOop soft_reference_klass() { return check_klass(_soft_reference_klass); }
265 static klassOop weak_reference_klass() { return check_klass(_weak_reference_klass); }
266 static klassOop final_reference_klass() { return check_klass(_final_reference_klass); }
267 static klassOop phantom_reference_klass() { return check_klass(_phantom_reference_klass); }
268 static klassOop finalizer_klass() { return check_klass(_finalizer_klass); }
269
270 static klassOop thread_klass() { return check_klass(_thread_klass); }
271 static klassOop threadGroup_klass() { return check_klass(_threadGroup_klass); }
272 static klassOop properties_klass() { return check_klass(_properties_klass); }
273 static klassOop reflect_accessible_object_klass() { return check_klass(_reflect_accessible_object_klass); }
274 static klassOop reflect_field_klass() { return check_klass(_reflect_field_klass); }
275 static klassOop reflect_method_klass() { return check_klass(_reflect_method_klass); }
276 static klassOop reflect_constructor_klass() { return check_klass(_reflect_constructor_klass); }
277 static klassOop reflect_method_accessor_klass() {
278 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only");
279 return check_klass(_reflect_method_accessor_klass);
280 }
281 static klassOop reflect_constructor_accessor_klass() {
282 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only");
283 return check_klass(_reflect_constructor_accessor_klass);
284 }
285 // NOTE: needed too early in bootstrapping process to have checks based on JDK version
286 static klassOop reflect_magic_klass() { return _reflect_magic_klass; }
287 static klassOop reflect_delegating_classloader_klass() { return _reflect_delegating_classloader_klass; }
288 static klassOop reflect_constant_pool_klass() {
289 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only");
290 return _reflect_constant_pool_klass;
291 }
292 static klassOop reflect_unsafe_static_field_accessor_impl_klass() {
293 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only");
294 return _reflect_unsafe_static_field_accessor_impl_klass;
295 }
296
297 static klassOop vector_klass() { return check_klass(_vector_klass); }
298 static klassOop hashtable_klass() { return check_klass(_hashtable_klass); }
299 static klassOop stringBuffer_klass() { return check_klass(_stringBuffer_klass); }
300 static klassOop stackTraceElement_klass() { return check_klass(_stackTraceElement_klass); }
301
302 static klassOop java_nio_Buffer_klass() { return check_klass(_java_nio_Buffer_klass); }
303
304 static klassOop sun_misc_AtomicLongCSImpl_klass() { return _sun_misc_AtomicLongCSImpl_klass; }
305
306 // To support incremental JRE downloads (KERNEL JRE). Null if not present.
307 static klassOop sun_jkernel_DownloadManager_klass() { return _sun_jkernel_DownloadManager_klass; }
308
309 static klassOop boolean_klass() { return check_klass(_boolean_klass); }
310 static klassOop char_klass() { return check_klass(_char_klass); }
311 static klassOop float_klass() { return check_klass(_float_klass); }
312 static klassOop double_klass() { return check_klass(_double_klass); }
313 static klassOop byte_klass() { return check_klass(_byte_klass); }
314 static klassOop short_klass() { return check_klass(_short_klass); }
315 static klassOop int_klass() { return check_klass(_int_klass); }
316 static klassOop long_klass() { return check_klass(_long_klass); }
317
318 static klassOop box_klass(BasicType t) {
319 assert((uint)t < T_VOID+1, "range check");
320 return check_klass(_box_klasses[t]);
321 }
322 static BasicType box_klass_type(klassOop k); // inverse of box_klass
323
324 // methods returning lazily loaded klasses
325 // The corresponding method to load the class must be called before calling them.
326 static klassOop abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); }
327
328 static void load_abstract_ownable_synchronizer_klass(TRAPS);
329
330 private:
331 // Tells whether ClassLoader.loadClassInternal is present
332 static bool has_loadClassInternal() { return _has_loadClassInternal; }
333
334 public:
335 // Tells whether ClassLoader.checkPackageAccess is present
336 static bool has_checkPackageAccess() { return _has_checkPackageAccess; }
337
338 static bool class_klass_loaded() { return _class_klass != NULL; }
339 static bool cloneable_klass_loaded() { return _cloneable_klass != NULL; }
340
341 // Returns default system loader
342 static oop java_system_loader();
343
344 // Compute the default system loader
345 static void compute_java_system_loader(TRAPS);
346
347 private:
348 // Mirrors for primitive classes (created eagerly)
349 static oop check_mirror(oop m) {
350 assert(m != NULL, "mirror not initialized");
351 return m;
352 }
353
354 public:
355 // Note: java_lang_Class::primitive_type is the inverse of java_mirror
356
357 // Check class loader constraints
358 static bool add_loader_constraint(symbolHandle name, Handle loader1,
359 Handle loader2, TRAPS);
360 static char* check_signature_loaders(symbolHandle signature, Handle loader1,
361 Handle loader2, bool is_method, TRAPS);
362
363 // Utility for printing loader "name" as part of tracing constraints
364 static const char* loader_name(oop loader) {
365 return ((loader) == NULL ? "<bootloader>" :
366 instanceKlass::cast((loader)->klass())->name()->as_C_string() );
367 }
368
369 // Record the error when the first attempt to resolve a reference from a constant
370 // pool entry to a class fails.
371 static void add_resolution_error(constantPoolHandle pool, int which, symbolHandle error);
372 static symbolOop find_resolution_error(constantPoolHandle pool, int which);
373
374 private:
375
376 enum Constants {
377 _loader_constraint_size = 107, // number of entries in constraint table
378 _resolution_error_size = 107, // number of entries in resolution error table
379 _nof_buckets = 1009 // number of buckets in hash table
380 };
381
382
383 // Static variables
384
385 // Hashtable holding loaded classes.
386 static Dictionary* _dictionary;
387
388 // Hashtable holding placeholders for classes being loaded.
389 static PlaceholderTable* _placeholders;
390
391 // Hashtable holding classes from the shared archive.
392 static Dictionary* _shared_dictionary;
393
394 // Monotonically increasing counter which grows with
395 // _number_of_classes as well as hot-swapping and breakpoint setting
396 // and removal.
397 static int _number_of_modifications;
398
399 // Lock object for system class loader
400 static oop _system_loader_lock_obj;
401
402 // Constraints on class loaders
403 static LoaderConstraintTable* _loader_constraints;
404
405 // Resolution errors
406 static ResolutionErrorTable* _resolution_errors;
407
408 public:
409 // for VM_CounterDecay iteration support
410 friend class CounterDecay;
411 static klassOop try_get_next_class();
412
413 private:
414 static void validate_protection_domain(instanceKlassHandle klass,
415 Handle class_loader,
416 Handle protection_domain, TRAPS);
417
418 friend class VM_PopulateDumpSharedSpace;
419 friend class TraversePlaceholdersClosure;
420 static Dictionary* dictionary() { return _dictionary; }
421 static Dictionary* shared_dictionary() { return _shared_dictionary; }
422 static PlaceholderTable* placeholders() { return _placeholders; }
423 static LoaderConstraintTable* constraints() { return _loader_constraints; }
424 static ResolutionErrorTable* resolution_errors() { return _resolution_errors; }
425
426 // Basic loading operations
427 static klassOop resolve_instance_class_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS);
428 static klassOop resolve_array_class_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS);
429 static instanceKlassHandle handle_parallel_super_load(symbolHandle class_name, symbolHandle supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS);
430 // Wait on SystemDictionary_lock; unlocks lockObject before
431 // waiting; relocks lockObject with correct recursion count
432 // after waiting, but before reentering SystemDictionary_lock
433 // to preserve lock order semantics.
434 static void double_lock_wait(Handle lockObject, TRAPS);
435 static void define_instance_class(instanceKlassHandle k, TRAPS);
436 static instanceKlassHandle find_or_define_instance_class(symbolHandle class_name,
437 Handle class_loader,
438 instanceKlassHandle k, TRAPS);
439 static instanceKlassHandle load_shared_class(symbolHandle class_name,
440 Handle class_loader, TRAPS);
441 static instanceKlassHandle load_shared_class(instanceKlassHandle ik,
442 Handle class_loader, TRAPS);
443 static instanceKlassHandle load_instance_class(symbolHandle class_name, Handle class_loader, TRAPS);
444 static Handle compute_loader_lock_object(Handle class_loader, TRAPS);
445 static void check_loader_lock_contention(Handle loader_lock, TRAPS);
446
447 static klassOop find_shared_class(symbolHandle class_name);
448
449 // Setup link to hierarchy
450 static void add_to_hierarchy(instanceKlassHandle k, TRAPS);
451
452 private:
453 // We pass in the hashtable index so we can calculate it outside of
454 // the SystemDictionary_lock.
455
456 // Basic find on loaded classes
457 static klassOop find_class(int index, unsigned int hash,
458 symbolHandle name, Handle loader);
459
460 // Basic find on classes in the midst of being loaded
461 static symbolOop find_placeholder(int index, unsigned int hash,
462 symbolHandle name, Handle loader);
463
464 // Basic find operation of loaded classes and classes in the midst
465 // of loading; used for assertions and verification only.
466 static oop find_class_or_placeholder(symbolHandle class_name,
467 Handle class_loader);
468
469 // Updating entry in dictionary
470 // Add a completely loaded class
471 static void add_klass(int index, symbolHandle class_name,
472 Handle class_loader, KlassHandle obj);
473
474 // Add a placeholder for a class being loaded
475 static void add_placeholder(int index,
476 symbolHandle class_name,
477 Handle class_loader);
478 static void remove_placeholder(int index,
479 symbolHandle class_name,
480 Handle class_loader);
481
482 // Performs cleanups after resolve_super_or_fail. This typically needs
483 // to be called on failure.
484 // Won't throw, but can block.
485 static void resolution_cleanups(symbolHandle class_name,
486 Handle class_loader,
487 TRAPS);
488
489 // Initialization
490 static void initialize_preloaded_classes(TRAPS);
491
492 // Class loader constraints
493 static void check_constraints(int index, unsigned int hash,
494 instanceKlassHandle k, Handle loader,
495 bool defining, TRAPS);
496 static void update_dictionary(int d_index, unsigned int d_hash,
497 int p_index, unsigned int p_hash,
498 instanceKlassHandle k, Handle loader, TRAPS);
499
500 // Variables holding commonly used klasses (preloaded)
501 static klassOop _object_klass;
502 static klassOop _string_klass;
503 static klassOop _class_klass;
504 static klassOop _cloneable_klass;
505 static klassOop _classloader_klass;
506 static klassOop _serializable_klass;
507 static klassOop _system_klass;
508
509 static klassOop _throwable_klass;
510 static klassOop _error_klass;
511 static klassOop _threaddeath_klass;
512 static klassOop _exception_klass;
513 static klassOop _runtime_exception_klass;
514 static klassOop _classNotFoundException_klass;
515 static klassOop _noClassDefFoundError_klass;
516 static klassOop _linkageError_klass;
517 static klassOop _classCastException_klass;
518 static klassOop _arrayStoreException_klass;
519 static klassOop _virtualMachineError_klass;
520 static klassOop _outOfMemoryError_klass;
521 static klassOop _StackOverflowError_klass;
522 static klassOop _illegalMonitorStateException_klass;
523 static klassOop _protectionDomain_klass;
524 static klassOop _AccessControlContext_klass;
525 static klassOop _reference_klass;
526 static klassOop _soft_reference_klass;
527 static klassOop _weak_reference_klass;
528 static klassOop _final_reference_klass;
529 static klassOop _phantom_reference_klass;
530 static klassOop _finalizer_klass;
531
532 static klassOop _thread_klass;
533 static klassOop _threadGroup_klass;
534 static klassOop _properties_klass;
535 static klassOop _reflect_accessible_object_klass;
536 static klassOop _reflect_field_klass;
537 static klassOop _reflect_method_klass;
538 static klassOop _reflect_constructor_klass;
539 // 1.4 reflection implementation
540 static klassOop _reflect_magic_klass;
541 static klassOop _reflect_method_accessor_klass;
542 static klassOop _reflect_constructor_accessor_klass;
543 static klassOop _reflect_delegating_classloader_klass;
544 // 1.5 annotations implementation
545 static klassOop _reflect_constant_pool_klass;
546 static klassOop _reflect_unsafe_static_field_accessor_impl_klass;
547
548 static klassOop _stringBuffer_klass;
549 static klassOop _vector_klass;
550 static klassOop _hashtable_klass;
551
552 static klassOop _stackTraceElement_klass;
553
554 static klassOop _java_nio_Buffer_klass;
555
556 static klassOop _sun_misc_AtomicLongCSImpl_klass;
557
558 // KERNEL JRE support.
559 static klassOop _sun_jkernel_DownloadManager_klass;
560
561 // Lazily loaded klasses
562 static volatile klassOop _abstract_ownable_synchronizer_klass;
563
564 // Box klasses
565 static klassOop _boolean_klass;
566 static klassOop _char_klass;
567 static klassOop _float_klass;
568 static klassOop _double_klass;
569 static klassOop _byte_klass;
570 static klassOop _short_klass;
571 static klassOop _int_klass;
572 static klassOop _long_klass;
573
574 // table of same
575 static klassOop _box_klasses[T_VOID+1];
576
577 static oop _java_system_loader;
578
579 static bool _has_loadClassInternal;
580 static bool _has_checkPackageAccess;
581 };