1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "aot/aotLoader.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/classLoaderDataGraph.hpp"
29 #include "classfile/javaClasses.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/symbolTable.hpp"
32 #include "classfile/systemDictionary.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "code/codeBehaviours.hpp"
35 #include "code/codeCache.hpp"
36 #include "code/dependencies.hpp"
37 #include "gc/shared/collectedHeap.inline.hpp"
38 #include "gc/shared/gcArguments.hpp"
39 #include "gc/shared/gcConfig.hpp"
40 #include "gc/shared/gcTraceTime.inline.hpp"
41 #include "interpreter/interpreter.hpp"
42 #include "logging/log.hpp"
43 #include "logging/logStream.hpp"
44 #include "memory/heapShared.hpp"
45 #include "memory/filemap.hpp"
46 #include "memory/metadataFactory.hpp"
47 #include "memory/metaspaceClosure.hpp"
48 #include "memory/metaspaceCounters.hpp"
49 #include "memory/metaspaceShared.hpp"
50 #include "memory/oopFactory.hpp"
51 #include "memory/resourceArea.hpp"
52 #include "memory/universe.hpp"
53 #include "oops/compressedOops.hpp"
54 #include "oops/constantPool.hpp"
55 #include "oops/instanceClassLoaderKlass.hpp"
56 #include "oops/instanceKlass.hpp"
57 #include "oops/instanceMirrorKlass.hpp"
58 #include "oops/instanceRefKlass.hpp"
59 #include "oops/objArrayOop.inline.hpp"
60 #include "oops/oop.inline.hpp"
61 #include "oops/typeArrayKlass.hpp"
62 #include "prims/resolvedMethodTable.hpp"
63 #include "runtime/arguments.hpp"
64 #include "runtime/atomic.hpp"
65 #include "runtime/deoptimization.hpp"
66 #include "runtime/flags/flagSetting.hpp"
67 #include "runtime/flags/jvmFlagConstraintList.hpp"
68 #include "runtime/handles.inline.hpp"
69 #include "runtime/init.hpp"
70 #include "runtime/java.hpp"
71 #include "runtime/javaCalls.hpp"
72 #include "runtime/sharedRuntime.hpp"
73 #include "runtime/synchronizer.hpp"
74 #include "runtime/thread.inline.hpp"
75 #include "runtime/timerTrace.hpp"
76 #include "runtime/vmOperations.hpp"
77 #include "services/memoryService.hpp"
78 #include "services/threadTable.hpp"
79 #include "utilities/align.hpp"
80 #include "utilities/copy.hpp"
81 #include "utilities/debug.hpp"
82 #include "utilities/events.hpp"
83 #include "utilities/formatBuffer.hpp"
84 #include "utilities/hashtable.inline.hpp"
85 #include "utilities/macros.hpp"
86 #include "utilities/ostream.hpp"
87 #include "utilities/preserveException.hpp"
88
89 // Known objects
90 Klass* Universe::_typeArrayKlassObjs[T_LONG+1] = { NULL /*, NULL...*/ };
91 Klass* Universe::_objectArrayKlassObj = NULL;
92 oop Universe::_int_mirror = NULL;
93 oop Universe::_float_mirror = NULL;
94 oop Universe::_double_mirror = NULL;
95 oop Universe::_byte_mirror = NULL;
96 oop Universe::_bool_mirror = NULL;
97 oop Universe::_char_mirror = NULL;
98 oop Universe::_long_mirror = NULL;
99 oop Universe::_short_mirror = NULL;
100 oop Universe::_void_mirror = NULL;
101 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ };
102 oop Universe::_main_thread_group = NULL;
103 oop Universe::_system_thread_group = NULL;
104 objArrayOop Universe::_the_empty_class_klass_array = NULL;
105 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
106 oop Universe::_the_null_sentinel = NULL;
107 oop Universe::_the_null_string = NULL;
108 oop Universe::_the_min_jint_string = NULL;
109 LatestMethodCache* Universe::_finalizer_register_cache = NULL;
110 LatestMethodCache* Universe::_loader_addClass_cache = NULL;
111 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL;
112 LatestMethodCache* Universe::_throw_no_such_method_error_cache = NULL;
113 LatestMethodCache* Universe::_do_stack_walk_cache = NULL;
114 oop Universe::_out_of_memory_error_java_heap = NULL;
115 oop Universe::_out_of_memory_error_metaspace = NULL;
116 oop Universe::_out_of_memory_error_class_metaspace = NULL;
117 oop Universe::_out_of_memory_error_array_size = NULL;
118 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL;
119 oop Universe::_out_of_memory_error_realloc_objects = NULL;
120 oop Universe::_out_of_memory_error_retry = NULL;
121 oop Universe::_delayed_stack_overflow_error_message = NULL;
122 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL;
123 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
124 bool Universe::_verify_in_progress = false;
125 long Universe::verify_flags = Universe::Verify_All;
126 oop Universe::_null_ptr_exception_instance = NULL;
127 oop Universe::_arithmetic_exception_instance = NULL;
128 oop Universe::_virtual_machine_error_instance = NULL;
129 oop Universe::_vm_exception = NULL;
130 oop Universe::_reference_pending_list = NULL;
131
132 Array<int>* Universe::_the_empty_int_array = NULL;
133 Array<u2>* Universe::_the_empty_short_array = NULL;
134 Array<Klass*>* Universe::_the_empty_klass_array = NULL;
135 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = NULL;
136 Array<Method*>* Universe::_the_empty_method_array = NULL;
137
138 // These variables are guarded by FullGCALot_lock.
139 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;)
140 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
141
142 // Heap
143 int Universe::_verify_count = 0;
144
145 // Oop verification (see MacroAssembler::verify_oop)
146 uintptr_t Universe::_verify_oop_mask = 0;
147 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
148
149 int Universe::_base_vtable_size = 0;
150 bool Universe::_bootstrapping = false;
151 bool Universe::_module_initialized = false;
152 bool Universe::_fully_initialized = false;
153
154 size_t Universe::_heap_capacity_at_last_gc;
155 size_t Universe::_heap_used_at_last_gc = 0;
156
157 CollectedHeap* Universe::_collectedHeap = NULL;
158
159 void Universe::basic_type_classes_do(void f(Klass*)) {
160 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
161 f(_typeArrayKlassObjs[i]);
162 }
163 }
164
165 void Universe::basic_type_classes_do(KlassClosure *closure) {
166 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
167 closure->do_klass(_typeArrayKlassObjs[i]);
168 }
169 }
170
171 void Universe::oops_do(OopClosure* f) {
172
173 f->do_oop((oop*) &_int_mirror);
174 f->do_oop((oop*) &_float_mirror);
175 f->do_oop((oop*) &_double_mirror);
176 f->do_oop((oop*) &_byte_mirror);
177 f->do_oop((oop*) &_bool_mirror);
178 f->do_oop((oop*) &_char_mirror);
179 f->do_oop((oop*) &_long_mirror);
180 f->do_oop((oop*) &_short_mirror);
181 f->do_oop((oop*) &_void_mirror);
182
183 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
184 f->do_oop((oop*) &_mirrors[i]);
185 }
186 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
187
188 f->do_oop((oop*)&_the_empty_class_klass_array);
189 f->do_oop((oop*)&_the_null_sentinel);
190 f->do_oop((oop*)&_the_null_string);
191 f->do_oop((oop*)&_the_min_jint_string);
192 f->do_oop((oop*)&_out_of_memory_error_java_heap);
193 f->do_oop((oop*)&_out_of_memory_error_metaspace);
194 f->do_oop((oop*)&_out_of_memory_error_class_metaspace);
195 f->do_oop((oop*)&_out_of_memory_error_array_size);
196 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit);
197 f->do_oop((oop*)&_out_of_memory_error_realloc_objects);
198 f->do_oop((oop*)&_out_of_memory_error_retry);
199 f->do_oop((oop*)&_delayed_stack_overflow_error_message);
200 f->do_oop((oop*)&_preallocated_out_of_memory_error_array);
201 f->do_oop((oop*)&_null_ptr_exception_instance);
202 f->do_oop((oop*)&_arithmetic_exception_instance);
203 f->do_oop((oop*)&_virtual_machine_error_instance);
204 f->do_oop((oop*)&_main_thread_group);
205 f->do_oop((oop*)&_system_thread_group);
206 f->do_oop((oop*)&_vm_exception);
207 f->do_oop((oop*)&_reference_pending_list);
208 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);)
209 }
210
211 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
212 it->push(&_klass);
213 }
214
215 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
216 for (int i = 0; i < T_LONG+1; i++) {
217 it->push(&_typeArrayKlassObjs[i]);
218 }
219 it->push(&_objectArrayKlassObj);
220
221 it->push(&_the_empty_int_array);
222 it->push(&_the_empty_short_array);
223 it->push(&_the_empty_klass_array);
224 it->push(&_the_empty_instance_klass_array);
225 it->push(&_the_empty_method_array);
226 it->push(&_the_array_interfaces_array);
227
228 _finalizer_register_cache->metaspace_pointers_do(it);
229 _loader_addClass_cache->metaspace_pointers_do(it);
230 _throw_illegal_access_error_cache->metaspace_pointers_do(it);
231 _throw_no_such_method_error_cache->metaspace_pointers_do(it);
232 _do_stack_walk_cache->metaspace_pointers_do(it);
233 }
234
235 // Serialize metadata and pointers to primitive type mirrors in and out of CDS archive
236 void Universe::serialize(SerializeClosure* f) {
237
238 for (int i = 0; i < T_LONG+1; i++) {
239 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
240 }
241
242 f->do_ptr((void**)&_objectArrayKlassObj);
243 #if INCLUDE_CDS_JAVA_HEAP
244 #ifdef ASSERT
245 if (DumpSharedSpaces && !HeapShared::is_heap_object_archiving_allowed()) {
246 assert(_int_mirror == NULL && _float_mirror == NULL &&
247 _double_mirror == NULL && _byte_mirror == NULL &&
248 _bool_mirror == NULL && _char_mirror == NULL &&
249 _long_mirror == NULL && _short_mirror == NULL &&
250 _void_mirror == NULL, "mirrors should be NULL");
251 }
252 #endif
253 f->do_oop(&_int_mirror);
254 f->do_oop(&_float_mirror);
255 f->do_oop(&_double_mirror);
256 f->do_oop(&_byte_mirror);
257 f->do_oop(&_bool_mirror);
258 f->do_oop(&_char_mirror);
259 f->do_oop(&_long_mirror);
260 f->do_oop(&_short_mirror);
261 f->do_oop(&_void_mirror);
262 #endif
263
264 f->do_ptr((void**)&_the_array_interfaces_array);
265 f->do_ptr((void**)&_the_empty_int_array);
266 f->do_ptr((void**)&_the_empty_short_array);
267 f->do_ptr((void**)&_the_empty_method_array);
268 f->do_ptr((void**)&_the_empty_klass_array);
269 f->do_ptr((void**)&_the_empty_instance_klass_array);
270 _finalizer_register_cache->serialize(f);
271 _loader_addClass_cache->serialize(f);
272 _throw_illegal_access_error_cache->serialize(f);
273 _throw_no_such_method_error_cache->serialize(f);
274 _do_stack_walk_cache->serialize(f);
275 }
276
277 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
278 if (size < alignment || size % alignment != 0) {
279 vm_exit_during_initialization(
280 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
281 }
282 }
283
284 void initialize_basic_type_klass(Klass* k, TRAPS) {
285 Klass* ok = SystemDictionary::Object_klass();
286 #if INCLUDE_CDS
287 if (UseSharedSpaces) {
288 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
289 assert(k->super() == ok, "u3");
290 k->restore_unshareable_info(loader_data, Handle(), CHECK);
291 } else
292 #endif
293 {
294 k->initialize_supers(ok, NULL, CHECK);
295 }
296 k->append_to_sibling_list();
297 }
298
299 void Universe::genesis(TRAPS) {
300 ResourceMark rm;
301
302 { FlagSetting fs(_bootstrapping, true);
303
304 { MutexLocker mc(Compile_lock);
305
306 java_lang_Class::allocate_fixup_lists();
307
308 // determine base vtable size; without that we cannot create the array klasses
309 compute_base_vtable_size();
310
311 if (!UseSharedSpaces) {
312 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
313 _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK);
314 }
315
316 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
317
318 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
319 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
320 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
321 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
322 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
323 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK);
324 }
325 }
326
327 vmSymbols::initialize(CHECK);
328
329 SystemDictionary::initialize(CHECK);
330
331 Klass* ok = SystemDictionary::Object_klass();
332
333 _the_null_string = StringTable::intern("null", CHECK);
334 _the_min_jint_string = StringTable::intern("-2147483648", CHECK);
335
336 #if INCLUDE_CDS
337 if (UseSharedSpaces) {
338 // Verify shared interfaces array.
339 assert(_the_array_interfaces_array->at(0) ==
340 SystemDictionary::Cloneable_klass(), "u3");
341 assert(_the_array_interfaces_array->at(1) ==
342 SystemDictionary::Serializable_klass(), "u3");
343 } else
344 #endif
345 {
346 // Set up shared interfaces array. (Do this before supers are set up.)
347 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
348 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
349 }
350
351 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
352 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
353 initialize_basic_type_klass(floatArrayKlassObj(), CHECK);
354 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
355 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
356 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
357 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
358 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
359 } // end of core bootstrapping
360
361 {
362 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
363 _the_null_sentinel = tns();
364 }
365
366 // Maybe this could be lifted up now that object array can be initialized
367 // during the bootstrapping.
368
369 // OLD
370 // Initialize _objectArrayKlass after core bootstraping to make
371 // sure the super class is set up properly for _objectArrayKlass.
372 // ---
373 // NEW
374 // Since some of the old system object arrays have been converted to
375 // ordinary object arrays, _objectArrayKlass will be loaded when
376 // SystemDictionary::initialize(CHECK); is run. See the extra check
377 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
378 _objectArrayKlassObj = InstanceKlass::
379 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
380 // OLD
381 // Add the class to the class hierarchy manually to make sure that
382 // its vtable is initialized after core bootstrapping is completed.
383 // ---
384 // New
385 // Have already been initialized.
386 _objectArrayKlassObj->append_to_sibling_list();
387
388 #ifdef ASSERT
389 if (FullGCALot) {
390 // Allocate an array of dummy objects.
391 // We'd like these to be at the bottom of the old generation,
392 // so that when we free one and then collect,
393 // (almost) the whole heap moves
394 // and we find out if we actually update all the oops correctly.
395 // But we can't allocate directly in the old generation,
396 // so we allocate wherever, and hope that the first collection
397 // moves these objects to the bottom of the old generation.
398 // We can allocate directly in the permanent generation, so we do.
399 int size;
400 if (UseConcMarkSweepGC) {
401 log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate");
402 size = FullGCALotDummies;
403 } else {
404 size = FullGCALotDummies * 2;
405 }
406 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
407 objArrayHandle dummy_array(THREAD, naked_array);
408 int i = 0;
409 while (i < size) {
410 // Allocate dummy in old generation
411 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK);
412 dummy_array->obj_at_put(i++, dummy);
413 }
414 {
415 // Only modify the global variable inside the mutex.
416 // If we had a race to here, the other dummy_array instances
417 // and their elements just get dropped on the floor, which is fine.
418 MutexLocker ml(FullGCALot_lock);
419 if (_fullgc_alot_dummy_array == NULL) {
420 _fullgc_alot_dummy_array = dummy_array();
421 }
422 }
423 assert(i == _fullgc_alot_dummy_array->length(), "just checking");
424 }
425 #endif
426 }
427
428 void Universe::initialize_basic_type_mirrors(TRAPS) {
429 #if INCLUDE_CDS_JAVA_HEAP
430 if (UseSharedSpaces &&
431 HeapShared::open_archive_heap_region_mapped() &&
432 _int_mirror != NULL) {
433 assert(HeapShared::is_heap_object_archiving_allowed(), "Sanity");
434 assert(_float_mirror != NULL && _double_mirror != NULL &&
435 _byte_mirror != NULL && _byte_mirror != NULL &&
436 _bool_mirror != NULL && _char_mirror != NULL &&
437 _long_mirror != NULL && _short_mirror != NULL &&
438 _void_mirror != NULL, "Sanity");
439 } else
440 #endif
441 {
442 _int_mirror =
443 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK);
444 _float_mirror =
445 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK);
446 _double_mirror =
447 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK);
448 _byte_mirror =
449 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK);
450 _bool_mirror =
451 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
452 _char_mirror =
453 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK);
454 _long_mirror =
455 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK);
456 _short_mirror =
457 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK);
458 _void_mirror =
459 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK);
460 }
461
462 _mirrors[T_INT] = _int_mirror;
463 _mirrors[T_FLOAT] = _float_mirror;
464 _mirrors[T_DOUBLE] = _double_mirror;
465 _mirrors[T_BYTE] = _byte_mirror;
466 _mirrors[T_BOOLEAN] = _bool_mirror;
467 _mirrors[T_CHAR] = _char_mirror;
468 _mirrors[T_LONG] = _long_mirror;
469 _mirrors[T_SHORT] = _short_mirror;
470 _mirrors[T_VOID] = _void_mirror;
471 //_mirrors[T_OBJECT] = _object_klass->java_mirror();
472 //_mirrors[T_ARRAY] = _object_klass->java_mirror();
473 }
474
475 void Universe::fixup_mirrors(TRAPS) {
476 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
477 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
478 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
479 // that the number of objects allocated at this point is very small.
480 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
481 HandleMark hm(THREAD);
482
483 if (!UseSharedSpaces) {
484 // Cache the start of the static fields
485 InstanceMirrorKlass::init_offset_of_static_fields();
486 }
487
488 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
489 int list_length = list->length();
490 for (int i = 0; i < list_length; i++) {
491 Klass* k = list->at(i);
492 assert(k->is_klass(), "List should only hold classes");
493 EXCEPTION_MARK;
494 java_lang_Class::fixup_mirror(k, CATCH);
495 }
496 delete java_lang_Class::fixup_mirror_list();
497 java_lang_Class::set_fixup_mirror_list(NULL);
498 }
499
500 #define assert_pll_locked(test) \
501 assert(Heap_lock->test(), "Reference pending list access requires lock")
502
503 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
504
505 oop Universe::reference_pending_list() {
506 if (Thread::current()->is_VM_thread()) {
507 assert_pll_locked(is_locked);
508 } else {
509 assert_pll_ownership();
510 }
511 return _reference_pending_list;
512 }
513
514 void Universe::set_reference_pending_list(oop list) {
515 assert_pll_ownership();
516 _reference_pending_list = list;
517 }
518
519 bool Universe::has_reference_pending_list() {
520 assert_pll_ownership();
521 return _reference_pending_list != NULL;
522 }
523
524 oop Universe::swap_reference_pending_list(oop list) {
525 assert_pll_locked(is_locked);
526 return Atomic::xchg(list, &_reference_pending_list);
527 }
528
529 #undef assert_pll_locked
530 #undef assert_pll_ownership
531
532 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) {
533 // init vtable of k and all subclasses
534 ko->vtable().initialize_vtable(false, CHECK);
535 if (ko->is_instance_klass()) {
536 for (Klass* sk = ko->subklass();
537 sk != NULL;
538 sk = sk->next_sibling()) {
539 reinitialize_vtable_of(sk, CHECK);
540 }
541 }
542 }
543
544 void Universe::reinitialize_vtables(TRAPS) {
545 // The vtables are initialized by starting at java.lang.Object and
546 // initializing through the subclass links, so that the super
547 // classes are always initialized first.
548 Klass* ok = SystemDictionary::Object_klass();
549 Universe::reinitialize_vtable_of(ok, THREAD);
550 }
551
552
553 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) {
554 k->itable().initialize_itable(false, CHECK);
555 }
556
557
558 void Universe::reinitialize_itables(TRAPS) {
559 MutexLocker mcld(ClassLoaderDataGraph_lock);
560 ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK);
561 }
562
563
564 bool Universe::on_page_boundary(void* addr) {
565 return is_aligned(addr, os::vm_page_size());
566 }
567
568
569 bool Universe::should_fill_in_stack_trace(Handle throwable) {
570 // never attempt to fill in the stack trace of preallocated errors that do not have
571 // backtrace. These errors are kept alive forever and may be "re-used" when all
572 // preallocated errors with backtrace have been consumed. Also need to avoid
573 // a potential loop which could happen if an out of memory occurs when attempting
574 // to allocate the backtrace.
575 return ((!oopDesc::equals(throwable(), Universe::_out_of_memory_error_java_heap)) &&
576 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_metaspace)) &&
577 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_class_metaspace)) &&
578 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_array_size)) &&
579 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_gc_overhead_limit)) &&
580 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_realloc_objects)) &&
581 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_retry)));
582 }
583
584
585 oop Universe::gen_out_of_memory_error(oop default_err) {
586 // generate an out of memory error:
587 // - if there is a preallocated error and stack traces are available
588 // (j.l.Throwable is initialized), then return the preallocated
589 // error with a filled in stack trace, and with the message
590 // provided by the default error.
591 // - otherwise, return the default error, without a stack trace.
592 int next;
593 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
594 SystemDictionary::Throwable_klass()->is_initialized()) {
595 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);
596 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
597 } else {
598 next = -1;
599 }
600 if (next < 0) {
601 // all preallocated errors have been used.
602 // return default
603 return default_err;
604 } else {
605 Thread* THREAD = Thread::current();
606 Handle default_err_h(THREAD, default_err);
607 // get the error object at the slot and set set it to NULL so that the
608 // array isn't keeping it alive anymore.
609 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next));
610 assert(exc() != NULL, "slot has been used already");
611 preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
612
613 // use the message from the default error
614 oop msg = java_lang_Throwable::message(default_err_h());
615 assert(msg != NULL, "no message");
616 java_lang_Throwable::set_message(exc(), msg);
617
618 // populate the stack trace and return it.
619 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
620 return exc();
621 }
622 }
623
624 intptr_t Universe::_non_oop_bits = 0;
625
626 void* Universe::non_oop_word() {
627 // Neither the high bits nor the low bits of this value is allowed
628 // to look like (respectively) the high or low bits of a real oop.
629 //
630 // High and low are CPU-specific notions, but low always includes
631 // the low-order bit. Since oops are always aligned at least mod 4,
632 // setting the low-order bit will ensure that the low half of the
633 // word will never look like that of a real oop.
634 //
635 // Using the OS-supplied non-memory-address word (usually 0 or -1)
636 // will take care of the high bits, however many there are.
637
638 if (_non_oop_bits == 0) {
639 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
640 }
641
642 return (void*)_non_oop_bits;
643 }
644
645 static void initialize_global_behaviours() {
646 CompiledICProtectionBehaviour::set_current(new DefaultICProtectionBehaviour());
647 }
648
649 jint universe_init() {
650 assert(!Universe::_fully_initialized, "called after initialize_vtables");
651 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
652 "LogHeapWordSize is incorrect.");
653 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
654 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
655 "oop size is not not a multiple of HeapWord size");
656
657 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
658
659 JavaClasses::compute_hard_coded_offsets();
660
661 initialize_global_behaviours();
662
663 GCConfig::arguments()->initialize_heap_sizes();
664
665 jint status = Universe::initialize_heap();
666 if (status != JNI_OK) {
667 return status;
668 }
669
670 CompressedOops::initialize();
671
672 Universe::initialize_tlab();
673
674 SystemDictionary::initialize_oop_storage();
675
676 Metaspace::global_initialize();
677
678 // Initialize performance counters for metaspaces
679 MetaspaceCounters::initialize_performance_counters();
680 CompressedClassSpaceCounters::initialize_performance_counters();
681
682 AOTLoader::universe_init();
683
684 // Checks 'AfterMemoryInit' constraints.
685 if (!JVMFlagConstraintList::check_constraints(JVMFlagConstraint::AfterMemoryInit)) {
686 return JNI_EINVAL;
687 }
688
689 // Create memory for metadata. Must be after initializing heap for
690 // DumpSharedSpaces.
691 ClassLoaderData::init_null_class_loader_data();
692
693 // We have a heap so create the Method* caches before
694 // Metaspace::initialize_shared_spaces() tries to populate them.
695 Universe::_finalizer_register_cache = new LatestMethodCache();
696 Universe::_loader_addClass_cache = new LatestMethodCache();
697 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
698 Universe::_throw_no_such_method_error_cache = new LatestMethodCache();
699 Universe::_do_stack_walk_cache = new LatestMethodCache();
700
701 #if INCLUDE_CDS
702 if (UseSharedSpaces) {
703 // Read the data structures supporting the shared spaces (shared
704 // system dictionary, symbol table, etc.). After that, access to
705 // the file (other than the mapped regions) is no longer needed, and
706 // the file is closed. Closing the file does not affect the
707 // currently mapped regions.
708 MetaspaceShared::initialize_shared_spaces();
709 StringTable::create_table();
710 } else
711 #endif
712 {
713 SymbolTable::create_table();
714 StringTable::create_table();
715 }
716
717 #if INCLUDE_CDS
718 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
719 MetaspaceShared::prepare_for_dumping();
720 }
721 #endif
722
723 if (strlen(VerifySubSet) > 0) {
724 Universe::initialize_verify_flags();
725 }
726
727 ResolvedMethodTable::create_table();
728 ThreadTable::create_table();
729 return JNI_OK;
730 }
731
732 jint Universe::initialize_heap() {
733 assert(_collectedHeap == NULL, "Heap already created");
734 _collectedHeap = GCConfig::arguments()->create_heap();
735 jint status = _collectedHeap->initialize();
736
737 if (status == JNI_OK) {
738 log_info(gc)("Using %s", _collectedHeap->name());
739 }
740
741 return status;
742 }
743
744 void Universe::initialize_tlab() {
745 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
746 if (UseTLAB) {
747 assert(Universe::heap()->supports_tlab_allocation(),
748 "Should support thread-local allocation buffers");
749 ThreadLocalAllocBuffer::startup_initialization();
750 }
751 }
752
753 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
754
755 assert(alignment <= Arguments::conservative_max_heap_alignment(),
756 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
757 alignment, Arguments::conservative_max_heap_alignment());
758
759 size_t total_reserved = align_up(heap_size, alignment);
760 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
761 "heap size is too big for compressed oops");
762
763 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size());
764 assert(!UseLargePages
765 || UseParallelGC
766 || use_large_pages, "Wrong alignment to use large pages");
767
768 // Now create the space.
769 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt);
770
771 if (total_rs.is_reserved()) {
772 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
773 "must be exactly of required size and alignment");
774 // We are good.
775
776 if (UseCompressedOops) {
777 // Universe::initialize_heap() will reset this to NULL if unscaled
778 // or zero-based narrow oops are actually used.
779 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
780 CompressedOops::set_base((address)total_rs.compressed_oop_base());
781 }
782
783 if (AllocateHeapAt != NULL) {
784 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
785 }
786 return total_rs;
787 }
788
789 vm_exit_during_initialization(
790 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
791 total_reserved/K));
792
793 // satisfy compiler
794 ShouldNotReachHere();
795 return ReservedHeapSpace(0, 0, false);
796 }
797
798
799 // It's the caller's responsibility to ensure glitch-freedom
800 // (if required).
801 void Universe::update_heap_info_at_gc() {
802 _heap_capacity_at_last_gc = heap()->capacity();
803 _heap_used_at_last_gc = heap()->used();
804 }
805
806 void initialize_known_method(LatestMethodCache* method_cache,
807 InstanceKlass* ik,
808 const char* method,
809 Symbol* signature,
810 bool is_static, TRAPS)
811 {
812 TempNewSymbol name = SymbolTable::new_symbol(method);
813 Method* m = NULL;
814 // The klass must be linked before looking up the method.
815 if (!ik->link_class_or_fail(THREAD) ||
816 ((m = ik->find_method(name, signature)) == NULL) ||
817 is_static != m->is_static()) {
818 ResourceMark rm(THREAD);
819 // NoSuchMethodException doesn't actually work because it tries to run the
820 // <init> function before java_lang_Class is linked. Print error and exit.
821 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
822 ik->name()->as_C_string(), method));
823 }
824 method_cache->init(ik, m);
825 }
826
827 void Universe::initialize_known_methods(TRAPS) {
828 // Set up static method for registering finalizers
829 initialize_known_method(_finalizer_register_cache,
830 SystemDictionary::Finalizer_klass(),
831 "register",
832 vmSymbols::object_void_signature(), true, CHECK);
833
834 initialize_known_method(_throw_illegal_access_error_cache,
835 SystemDictionary::internal_Unsafe_klass(),
836 "throwIllegalAccessError",
837 vmSymbols::void_method_signature(), true, CHECK);
838
839 initialize_known_method(_throw_no_such_method_error_cache,
840 SystemDictionary::internal_Unsafe_klass(),
841 "throwNoSuchMethodError",
842 vmSymbols::void_method_signature(), true, CHECK);
843
844 // Set up method for registering loaded classes in class loader vector
845 initialize_known_method(_loader_addClass_cache,
846 SystemDictionary::ClassLoader_klass(),
847 "addClass",
848 vmSymbols::class_void_signature(), false, CHECK);
849
850 // Set up method for stack walking
851 initialize_known_method(_do_stack_walk_cache,
852 SystemDictionary::AbstractStackWalker_klass(),
853 "doStackWalk",
854 vmSymbols::doStackWalk_signature(), false, CHECK);
855 }
856
857 void universe2_init() {
858 EXCEPTION_MARK;
859 Universe::genesis(CATCH);
860 }
861
862 // Set after initialization of the module runtime, call_initModuleRuntime
863 void universe_post_module_init() {
864 Universe::_module_initialized = true;
865 }
866
867 bool universe_post_init() {
868 assert(!is_init_completed(), "Error: initialization not yet completed!");
869 Universe::_fully_initialized = true;
870 EXCEPTION_MARK;
871 { ResourceMark rm;
872 Interpreter::initialize(); // needed for interpreter entry points
873 if (!UseSharedSpaces) {
874 Universe::reinitialize_vtables(CHECK_false);
875 Universe::reinitialize_itables(CHECK_false);
876 }
877 }
878
879 HandleMark hm(THREAD);
880 // Setup preallocated empty java.lang.Class array
881 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
882
883 // Setup preallocated OutOfMemoryError errors
884 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
885 InstanceKlass* ik = InstanceKlass::cast(k);
886 Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false);
887 Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false);
888 Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false);
889 Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false);
890 Universe::_out_of_memory_error_gc_overhead_limit =
891 ik->allocate_instance(CHECK_false);
892 Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false);
893 Universe::_out_of_memory_error_retry = ik->allocate_instance(CHECK_false);
894
895 // Setup preallocated cause message for delayed StackOverflowError
896 if (StackReservedPages > 0) {
897 Universe::_delayed_stack_overflow_error_message =
898 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
899 }
900
901 // Setup preallocated NullPointerException
902 // (this is currently used for a cheap & dirty solution in compiler exception handling)
903 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
904 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
905 // Setup preallocated ArithmeticException
906 // (this is currently used for a cheap & dirty solution in compiler exception handling)
907 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
908 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
909 // Virtual Machine Error for when we get into a situation we can't resolve
910 k = SystemDictionary::resolve_or_fail(
911 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
912 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
913 if (!linked) {
914 tty->print_cr("Unable to link/verify VirtualMachineError class");
915 return false; // initialization failed
916 }
917 Universe::_virtual_machine_error_instance =
918 InstanceKlass::cast(k)->allocate_instance(CHECK_false);
919
920 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
921
922 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
923 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
924
925 msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
926 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
927 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
928 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
929
930 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
931 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
932
933 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
934 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
935
936 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false);
937 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg());
938
939 msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK_false);
940 java_lang_Throwable::set_message(Universe::_out_of_memory_error_retry, msg());
941
942 msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
943 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
944
945 // Setup the array of errors that have preallocated backtrace
946 k = Universe::_out_of_memory_error_java_heap->klass();
947 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
948 ik = InstanceKlass::cast(k);
949
950 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
951 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false);
952 for (int i=0; i<len; i++) {
953 oop err = ik->allocate_instance(CHECK_false);
954 Handle err_h = Handle(THREAD, err);
955 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
956 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
957 }
958 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
959
960 Universe::initialize_known_methods(CHECK_false);
961
962 // This needs to be done before the first scavenge/gc, since
963 // it's an input to soft ref clearing policy.
964 {
965 MutexLocker x(Heap_lock);
966 Universe::update_heap_info_at_gc();
967 }
968
969 // ("weak") refs processing infrastructure initialization
970 Universe::heap()->post_initialize();
971
972 MemoryService::add_metaspace_memory_pools();
973
974 MemoryService::set_universe_heap(Universe::heap());
975 #if INCLUDE_CDS
976 MetaspaceShared::post_initialize(CHECK_false);
977 #endif
978 return true;
979 }
980
981
982 void Universe::compute_base_vtable_size() {
983 _base_vtable_size = ClassLoader::compute_Object_vtable();
984 }
985
986 void Universe::print_on(outputStream* st) {
987 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
988 st->print_cr("Heap");
989 heap()->print_on(st);
990 }
991
992 void Universe::print_heap_at_SIGBREAK() {
993 if (PrintHeapAtSIGBREAK) {
994 print_on(tty);
995 tty->cr();
996 tty->flush();
997 }
998 }
999
1000 void Universe::print_heap_before_gc() {
1001 LogTarget(Debug, gc, heap) lt;
1002 if (lt.is_enabled()) {
1003 LogStream ls(lt);
1004 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1005 ResourceMark rm;
1006 heap()->print_on(&ls);
1007 }
1008 }
1009
1010 void Universe::print_heap_after_gc() {
1011 LogTarget(Debug, gc, heap) lt;
1012 if (lt.is_enabled()) {
1013 LogStream ls(lt);
1014 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1015 ResourceMark rm;
1016 heap()->print_on(&ls);
1017 }
1018 }
1019
1020 void Universe::initialize_verify_flags() {
1021 verify_flags = 0;
1022 const char delimiter[] = " ,";
1023
1024 size_t length = strlen(VerifySubSet);
1025 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1026 strncpy(subset_list, VerifySubSet, length + 1);
1027 char* save_ptr;
1028
1029 char* token = strtok_r(subset_list, delimiter, &save_ptr);
1030 while (token != NULL) {
1031 if (strcmp(token, "threads") == 0) {
1032 verify_flags |= Verify_Threads;
1033 } else if (strcmp(token, "heap") == 0) {
1034 verify_flags |= Verify_Heap;
1035 } else if (strcmp(token, "symbol_table") == 0) {
1036 verify_flags |= Verify_SymbolTable;
1037 } else if (strcmp(token, "string_table") == 0) {
1038 verify_flags |= Verify_StringTable;
1039 } else if (strcmp(token, "codecache") == 0) {
1040 verify_flags |= Verify_CodeCache;
1041 } else if (strcmp(token, "dictionary") == 0) {
1042 verify_flags |= Verify_SystemDictionary;
1043 } else if (strcmp(token, "classloader_data_graph") == 0) {
1044 verify_flags |= Verify_ClassLoaderDataGraph;
1045 } else if (strcmp(token, "metaspace") == 0) {
1046 verify_flags |= Verify_MetaspaceUtils;
1047 } else if (strcmp(token, "jni_handles") == 0) {
1048 verify_flags |= Verify_JNIHandles;
1049 } else if (strcmp(token, "codecache_oops") == 0) {
1050 verify_flags |= Verify_CodeCacheOops;
1051 } else if (strcmp(token, "resolved_method_table") == 0) {
1052 verify_flags |= Verify_ResolvedMethodTable;
1053 } else {
1054 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1055 }
1056 token = strtok_r(NULL, delimiter, &save_ptr);
1057 }
1058 FREE_C_HEAP_ARRAY(char, subset_list);
1059 }
1060
1061 bool Universe::should_verify_subset(uint subset) {
1062 if (verify_flags & subset) {
1063 return true;
1064 }
1065 return false;
1066 }
1067
1068 void Universe::verify(VerifyOption option, const char* prefix) {
1069 // The use of _verify_in_progress is a temporary work around for
1070 // 6320749. Don't bother with a creating a class to set and clear
1071 // it since it is only used in this method and the control flow is
1072 // straight forward.
1073 _verify_in_progress = true;
1074
1075 COMPILER2_PRESENT(
1076 assert(!DerivedPointerTable::is_active(),
1077 "DPT should not be active during verification "
1078 "(of thread stacks below)");
1079 )
1080
1081 ResourceMark rm;
1082 HandleMark hm; // Handles created during verification can be zapped
1083 _verify_count++;
1084
1085 FormatBuffer<> title("Verifying %s", prefix);
1086 GCTraceTime(Info, gc, verify) tm(title.buffer());
1087 if (should_verify_subset(Verify_Threads)) {
1088 log_debug(gc, verify)("Threads");
1089 Threads::verify();
1090 }
1091 if (should_verify_subset(Verify_Heap)) {
1092 log_debug(gc, verify)("Heap");
1093 heap()->verify(option);
1094 }
1095 if (should_verify_subset(Verify_SymbolTable)) {
1096 log_debug(gc, verify)("SymbolTable");
1097 SymbolTable::verify();
1098 }
1099 if (should_verify_subset(Verify_StringTable)) {
1100 log_debug(gc, verify)("StringTable");
1101 StringTable::verify();
1102 }
1103 if (should_verify_subset(Verify_CodeCache)) {
1104 {
1105 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1106 log_debug(gc, verify)("CodeCache");
1107 CodeCache::verify();
1108 }
1109 }
1110 if (should_verify_subset(Verify_SystemDictionary)) {
1111 log_debug(gc, verify)("SystemDictionary");
1112 SystemDictionary::verify();
1113 }
1114 #ifndef PRODUCT
1115 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1116 log_debug(gc, verify)("ClassLoaderDataGraph");
1117 ClassLoaderDataGraph::verify();
1118 }
1119 #endif
1120 if (should_verify_subset(Verify_MetaspaceUtils)) {
1121 log_debug(gc, verify)("MetaspaceUtils");
1122 MetaspaceUtils::verify_free_chunks();
1123 }
1124 if (should_verify_subset(Verify_JNIHandles)) {
1125 log_debug(gc, verify)("JNIHandles");
1126 JNIHandles::verify();
1127 }
1128 if (should_verify_subset(Verify_CodeCacheOops)) {
1129 log_debug(gc, verify)("CodeCache Oops");
1130 CodeCache::verify_oops();
1131 }
1132 if (should_verify_subset(Verify_ResolvedMethodTable)) {
1133 log_debug(gc, verify)("ResolvedMethodTable Oops");
1134 ResolvedMethodTable::verify();
1135 }
1136
1137 _verify_in_progress = false;
1138 }
1139
1140
1141 #ifndef PRODUCT
1142 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1143 assert(low_boundary < high_boundary, "bad interval");
1144
1145 // decide which low-order bits we require to be clear:
1146 size_t alignSize = MinObjAlignmentInBytes;
1147 size_t min_object_size = CollectedHeap::min_fill_size();
1148
1149 // make an inclusive limit:
1150 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1151 uintptr_t min = (uintptr_t)low_boundary;
1152 assert(min < max, "bad interval");
1153 uintptr_t diff = max ^ min;
1154
1155 // throw away enough low-order bits to make the diff vanish
1156 uintptr_t mask = (uintptr_t)(-1);
1157 while ((mask & diff) != 0)
1158 mask <<= 1;
1159 uintptr_t bits = (min & mask);
1160 assert(bits == (max & mask), "correct mask");
1161 // check an intermediate value between min and max, just to make sure:
1162 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1163
1164 // require address alignment, too:
1165 mask |= (alignSize - 1);
1166
1167 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1168 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1169 }
1170 _verify_oop_mask = mask;
1171 _verify_oop_bits = bits;
1172 }
1173
1174 // Oop verification (see MacroAssembler::verify_oop)
1175
1176 uintptr_t Universe::verify_oop_mask() {
1177 MemRegion m = heap()->reserved_region();
1178 calculate_verify_data(m.start(), m.end());
1179 return _verify_oop_mask;
1180 }
1181
1182 uintptr_t Universe::verify_oop_bits() {
1183 MemRegion m = heap()->reserved_region();
1184 calculate_verify_data(m.start(), m.end());
1185 return _verify_oop_bits;
1186 }
1187
1188 uintptr_t Universe::verify_mark_mask() {
1189 return markOopDesc::lock_mask_in_place;
1190 }
1191
1192 uintptr_t Universe::verify_mark_bits() {
1193 intptr_t mask = verify_mark_mask();
1194 intptr_t bits = (intptr_t)markOopDesc::prototype();
1195 assert((bits & ~mask) == 0, "no stray header bits");
1196 return bits;
1197 }
1198 #endif // PRODUCT
1199
1200
1201 void LatestMethodCache::init(Klass* k, Method* m) {
1202 if (!UseSharedSpaces) {
1203 _klass = k;
1204 }
1205 #ifndef PRODUCT
1206 else {
1207 // sharing initilization should have already set up _klass
1208 assert(_klass != NULL, "just checking");
1209 }
1210 #endif
1211
1212 _method_idnum = m->method_idnum();
1213 assert(_method_idnum >= 0, "sanity check");
1214 }
1215
1216
1217 Method* LatestMethodCache::get_method() {
1218 if (klass() == NULL) return NULL;
1219 InstanceKlass* ik = InstanceKlass::cast(klass());
1220 Method* m = ik->method_with_idnum(method_idnum());
1221 assert(m != NULL, "sanity check");
1222 return m;
1223 }
1224
1225
1226 #ifdef ASSERT
1227 // Release dummy object(s) at bottom of heap
1228 bool Universe::release_fullgc_alot_dummy() {
1229 MutexLocker ml(FullGCALot_lock);
1230 if (_fullgc_alot_dummy_array != NULL) {
1231 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
1232 // No more dummies to release, release entire array instead
1233 _fullgc_alot_dummy_array = NULL;
1234 return false;
1235 }
1236 if (!UseConcMarkSweepGC) {
1237 // Release dummy at bottom of old generation
1238 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1239 }
1240 // Release dummy at bottom of permanent generation
1241 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1242 }
1243 return true;
1244 }
1245
1246 #endif // ASSERT