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