1 /*
2 * Copyright (c) 1997, 2020, 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/gcLogPrecious.hpp"
41 #include "gc/shared/gcTraceTime.inline.hpp"
42 #include "gc/shared/oopStorageSet.hpp"
43 #include "interpreter/interpreter.hpp"
44 #include "logging/log.hpp"
45 #include "logging/logStream.hpp"
46 #include "memory/heapShared.hpp"
47 #include "memory/filemap.hpp"
48 #include "memory/metadataFactory.hpp"
49 #include "memory/metaspaceClosure.hpp"
50 #include "memory/metaspaceCounters.hpp"
51 #include "memory/metaspaceShared.hpp"
52 #include "memory/oopFactory.hpp"
53 #include "memory/resourceArea.hpp"
54 #include "memory/universe.hpp"
55 #include "oops/compressedOops.hpp"
56 #include "oops/constantPool.hpp"
57 #include "oops/instanceClassLoaderKlass.hpp"
58 #include "oops/instanceKlass.hpp"
59 #include "oops/instanceMirrorKlass.hpp"
60 #include "oops/instanceRefKlass.hpp"
61 #include "oops/objArrayOop.inline.hpp"
62 #include "oops/oop.inline.hpp"
63 #include "oops/oopHandle.inline.hpp"
64 #include "oops/typeArrayKlass.hpp"
65 #include "prims/resolvedMethodTable.hpp"
66 #include "runtime/arguments.hpp"
67 #include "runtime/atomic.hpp"
68 #include "runtime/deoptimization.hpp"
69 #include "runtime/flags/jvmFlagConstraintList.hpp"
70 #include "runtime/handles.inline.hpp"
71 #include "runtime/init.hpp"
72 #include "runtime/java.hpp"
73 #include "runtime/javaCalls.hpp"
74 #include "runtime/sharedRuntime.hpp"
75 #include "runtime/synchronizer.hpp"
76 #include "runtime/thread.inline.hpp"
77 #include "runtime/timerTrace.hpp"
78 #include "runtime/vmOperations.hpp"
79 #include "services/memoryService.hpp"
80 #include "utilities/align.hpp"
81 #include "utilities/autoRestore.hpp"
82 #include "utilities/copy.hpp"
83 #include "utilities/debug.hpp"
84 #include "utilities/events.hpp"
85 #include "utilities/formatBuffer.hpp"
86 #include "utilities/hashtable.inline.hpp"
87 #include "utilities/macros.hpp"
88 #include "utilities/ostream.hpp"
89 #include "utilities/preserveException.hpp"
90
91 // Known objects
92 Klass* Universe::_typeArrayKlassObjs[T_LONG+1] = { NULL /*, NULL...*/ };
93 Klass* Universe::_objectArrayKlassObj = NULL;
94 OopHandle Universe::_mirrors[T_VOID+1];
95
96 OopHandle Universe::_main_thread_group;
97 OopHandle Universe::_system_thread_group;
98 OopHandle Universe::_the_empty_class_array;
99 OopHandle Universe::_the_null_string;
100 OopHandle Universe::_the_min_jint_string;
101
102 OopHandle Universe::_the_null_sentinel;
103
104 // _out_of_memory_errors is an objArray
105 enum OutOfMemoryInstance { _oom_java_heap,
106 _oom_metaspace,
107 _oom_class_metaspace,
108 _oom_array_size,
109 _oom_gc_overhead_limit,
110 _oom_realloc_objects,
111 _oom_retry,
112 _oom_count };
113
114 OopHandle Universe::_out_of_memory_errors;
115 OopHandle Universe::_delayed_stack_overflow_error_message;
116 OopHandle Universe::_preallocated_out_of_memory_error_array;
117 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
118
119 OopHandle Universe::_null_ptr_exception_instance;
120 OopHandle Universe::_arithmetic_exception_instance;
121 OopHandle Universe::_virtual_machine_error_instance;
122
123 oop Universe::_reference_pending_list = NULL;
124
125 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
126 LatestMethodCache* Universe::_finalizer_register_cache = NULL;
127 LatestMethodCache* Universe::_loader_addClass_cache = NULL;
128 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL;
129 LatestMethodCache* Universe::_throw_no_such_method_error_cache = NULL;
130 LatestMethodCache* Universe::_do_stack_walk_cache = NULL;
131
132 bool Universe::_verify_in_progress = false;
133 long Universe::verify_flags = Universe::Verify_All;
134
135 Array<int>* Universe::_the_empty_int_array = NULL;
136 Array<u2>* Universe::_the_empty_short_array = NULL;
137 Array<Klass*>* Universe::_the_empty_klass_array = NULL;
138 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = NULL;
139 Array<Method*>* Universe::_the_empty_method_array = NULL;
140
141 // These variables are guarded by FullGCALot_lock.
142 debug_only(OopHandle Universe::_fullgc_alot_dummy_array;)
143 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
144
145 // Heap
146 int Universe::_verify_count = 0;
147
148 // Oop verification (see MacroAssembler::verify_oop)
149 uintptr_t Universe::_verify_oop_mask = 0;
150 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
151
152 int Universe::_base_vtable_size = 0;
153 bool Universe::_bootstrapping = false;
154 bool Universe::_module_initialized = false;
155 bool Universe::_fully_initialized = false;
156
157 size_t Universe::_heap_capacity_at_last_gc;
158 size_t Universe::_heap_used_at_last_gc = 0;
159
160 OopStorage* Universe::_vm_weak = NULL;
161 OopStorage* Universe::_vm_global = NULL;
162
163 CollectedHeap* Universe::_collectedHeap = NULL;
164
165 objArrayOop Universe::the_empty_class_array () {
166 return (objArrayOop)_the_empty_class_array.resolve();
167 }
168
169 oop Universe::main_thread_group() { return _main_thread_group.resolve(); }
170 void Universe::set_main_thread_group(oop group) { _main_thread_group = OopHandle(vm_global(), group); }
171
172 oop Universe::system_thread_group() { return _system_thread_group.resolve(); }
173 void Universe::set_system_thread_group(oop group) { _system_thread_group = OopHandle(vm_global(), group); }
174
175 oop Universe::the_null_string() { return _the_null_string.resolve(); }
176 oop Universe::the_min_jint_string() { return _the_min_jint_string.resolve(); }
177
178 oop Universe::null_ptr_exception_instance() { return _null_ptr_exception_instance.resolve(); }
179 oop Universe::arithmetic_exception_instance() { return _arithmetic_exception_instance.resolve(); }
180 oop Universe::virtual_machine_error_instance() { return _virtual_machine_error_instance.resolve(); }
181
182 oop Universe::the_null_sentinel() { return _the_null_sentinel.resolve(); }
183
184 oop Universe::int_mirror() { return check_mirror(_mirrors[T_INT].resolve()); }
185 oop Universe::float_mirror() { return check_mirror(_mirrors[T_FLOAT].resolve()); }
186 oop Universe::double_mirror() { return check_mirror(_mirrors[T_DOUBLE].resolve()); }
187 oop Universe::byte_mirror() { return check_mirror(_mirrors[T_BYTE].resolve()); }
188 oop Universe::bool_mirror() { return check_mirror(_mirrors[T_BOOLEAN].resolve()); }
189 oop Universe::char_mirror() { return check_mirror(_mirrors[T_CHAR].resolve()); }
190 oop Universe::long_mirror() { return check_mirror(_mirrors[T_LONG].resolve()); }
191 oop Universe::short_mirror() { return check_mirror(_mirrors[T_SHORT].resolve()); }
192 oop Universe::void_mirror() { return check_mirror(_mirrors[T_VOID].resolve()); }
193
194 oop Universe::java_mirror(BasicType t) {
195 assert((uint)t < T_VOID+1, "range check");
196 return check_mirror(_mirrors[t].resolve());
197 }
198
199 // Used by CDS dumping
200 void Universe::replace_mirror(BasicType t, oop new_mirror) {
201 Universe::_mirrors[t].replace(new_mirror);
202 }
203
204 // Not sure why CDS has to do this
205 void Universe::clear_basic_type_mirrors() {
206 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
207 if (!is_reference_type((BasicType)i)) {
208 Universe::_mirrors[i].replace(NULL);
209 }
210 }
211 }
212
213 void Universe::basic_type_classes_do(void f(Klass*)) {
214 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
215 f(_typeArrayKlassObjs[i]);
216 }
217 }
218
219 void Universe::basic_type_classes_do(KlassClosure *closure) {
220 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
221 closure->do_klass(_typeArrayKlassObjs[i]);
222 }
223 }
224
225 void Universe::oops_do(OopClosure* f) {
226
227 f->do_oop(&_reference_pending_list);
228 ThreadsSMRSupport::exiting_threads_oops_do(f);
229 }
230
231 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
232 it->push(&_klass);
233 }
234
235 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
236 for (int i = 0; i < T_LONG+1; i++) {
237 it->push(&_typeArrayKlassObjs[i]);
238 }
239 it->push(&_objectArrayKlassObj);
240
241 it->push(&_the_empty_int_array);
242 it->push(&_the_empty_short_array);
243 it->push(&_the_empty_klass_array);
244 it->push(&_the_empty_instance_klass_array);
245 it->push(&_the_empty_method_array);
246 it->push(&_the_array_interfaces_array);
247
248 _finalizer_register_cache->metaspace_pointers_do(it);
249 _loader_addClass_cache->metaspace_pointers_do(it);
250 _throw_illegal_access_error_cache->metaspace_pointers_do(it);
251 _throw_no_such_method_error_cache->metaspace_pointers_do(it);
252 _do_stack_walk_cache->metaspace_pointers_do(it);
253 }
254
255 // Serialize metadata and pointers to primitive type mirrors in and out of CDS archive
256 void Universe::serialize(SerializeClosure* f) {
257
258 #if INCLUDE_CDS_JAVA_HEAP
259 {
260 oop mirror_oop;
261 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
262 if (f->reading()) {
263 f->do_oop(&mirror_oop); // read from archive
264 assert(oopDesc::is_oop_or_null(mirror_oop), "is oop");
265 _mirrors[i] = OopHandle(vm_global(), mirror_oop);
266 } else {
267 mirror_oop = _mirrors[i].resolve();
268 f->do_oop(&mirror_oop); // write to archive
269 }
270 if (mirror_oop != NULL) { // may be null if archived heap is disabled
271 java_lang_Class::update_archived_primitive_mirror_native_pointers(mirror_oop);
272 }
273 }
274 }
275 #endif
276
277 for (int i = 0; i < T_LONG+1; i++) {
278 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
279 }
280
281 f->do_ptr((void**)&_objectArrayKlassObj);
282 f->do_ptr((void**)&_the_array_interfaces_array);
283 f->do_ptr((void**)&_the_empty_int_array);
284 f->do_ptr((void**)&_the_empty_short_array);
285 f->do_ptr((void**)&_the_empty_method_array);
286 f->do_ptr((void**)&_the_empty_klass_array);
287 f->do_ptr((void**)&_the_empty_instance_klass_array);
288 _finalizer_register_cache->serialize(f);
289 _loader_addClass_cache->serialize(f);
290 _throw_illegal_access_error_cache->serialize(f);
291 _throw_no_such_method_error_cache->serialize(f);
292 _do_stack_walk_cache->serialize(f);
293 }
294
295
296 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
297 if (size < alignment || size % alignment != 0) {
298 vm_exit_during_initialization(
299 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
300 }
301 }
302
303 void initialize_basic_type_klass(Klass* k, TRAPS) {
304 Klass* ok = SystemDictionary::Object_klass();
305 #if INCLUDE_CDS
306 if (UseSharedSpaces) {
307 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
308 assert(k->super() == ok, "u3");
309 if (k->is_instance_klass()) {
310 InstanceKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), NULL, CHECK);
311 } else {
312 ArrayKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), CHECK);
313 }
314 } else
315 #endif
316 {
317 k->initialize_supers(ok, NULL, CHECK);
318 }
319 k->append_to_sibling_list();
320 }
321
322 void Universe::genesis(TRAPS) {
323 ResourceMark rm(THREAD);
324
325 { AutoModifyRestore<bool> temporarily(_bootstrapping, true);
326
327 { MutexLocker mc(THREAD, Compile_lock);
328
329 java_lang_Class::allocate_fixup_lists();
330
331 // determine base vtable size; without that we cannot create the array klasses
332 compute_base_vtable_size();
333
334 if (!UseSharedSpaces) {
335 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
336 _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK);
337 }
338
339 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
340
341 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
342 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
343 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
344 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
345 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
346 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK);
347 }
348 }
349
350 vmSymbols::initialize(CHECK);
351
352 SystemDictionary::initialize(CHECK);
353
354 // Create string constants
355 oop s = StringTable::intern("null", CHECK);
356 _the_null_string = OopHandle(vm_global(), s);
357 s = StringTable::intern("-2147483648", CHECK);
358 _the_min_jint_string = OopHandle(vm_global(), s);
359
360
361 #if INCLUDE_CDS
362 if (UseSharedSpaces) {
363 // Verify shared interfaces array.
364 assert(_the_array_interfaces_array->at(0) ==
365 SystemDictionary::Cloneable_klass(), "u3");
366 assert(_the_array_interfaces_array->at(1) ==
367 SystemDictionary::Serializable_klass(), "u3");
368 } else
369 #endif
370 {
371 // Set up shared interfaces array. (Do this before supers are set up.)
372 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
373 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
374 }
375
376 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
377 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
378 initialize_basic_type_klass(floatArrayKlassObj(), CHECK);
379 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
380 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
381 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
382 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
383 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
384 } // end of core bootstrapping
385
386 {
387 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
388 _the_null_sentinel = OopHandle(vm_global(), tns());
389 }
390
391 // Maybe this could be lifted up now that object array can be initialized
392 // during the bootstrapping.
393
394 // OLD
395 // Initialize _objectArrayKlass after core bootstraping to make
396 // sure the super class is set up properly for _objectArrayKlass.
397 // ---
398 // NEW
399 // Since some of the old system object arrays have been converted to
400 // ordinary object arrays, _objectArrayKlass will be loaded when
401 // SystemDictionary::initialize(CHECK); is run. See the extra check
402 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
403 _objectArrayKlassObj = InstanceKlass::
404 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
405 // OLD
406 // Add the class to the class hierarchy manually to make sure that
407 // its vtable is initialized after core bootstrapping is completed.
408 // ---
409 // New
410 // Have already been initialized.
411 _objectArrayKlassObj->append_to_sibling_list();
412
413 #ifdef ASSERT
414 if (FullGCALot) {
415 // Allocate an array of dummy objects.
416 // We'd like these to be at the bottom of the old generation,
417 // so that when we free one and then collect,
418 // (almost) the whole heap moves
419 // and we find out if we actually update all the oops correctly.
420 // But we can't allocate directly in the old generation,
421 // so we allocate wherever, and hope that the first collection
422 // moves these objects to the bottom of the old generation.
423 int size = FullGCALotDummies * 2;
424
425 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
426 objArrayHandle dummy_array(THREAD, naked_array);
427 int i = 0;
428 while (i < size) {
429 // Allocate dummy in old generation
430 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK);
431 dummy_array->obj_at_put(i++, dummy);
432 }
433 {
434 // Only modify the global variable inside the mutex.
435 // If we had a race to here, the other dummy_array instances
436 // and their elements just get dropped on the floor, which is fine.
437 MutexLocker ml(THREAD, FullGCALot_lock);
438 if (_fullgc_alot_dummy_array.is_empty()) {
439 _fullgc_alot_dummy_array = OopHandle(vm_global(), dummy_array());
440 }
441 }
442 assert(i == ((objArrayOop)_fullgc_alot_dummy_array.resolve())->length(), "just checking");
443 }
444 #endif
445 }
446
447 void Universe::initialize_basic_type_mirrors(TRAPS) {
448 #if INCLUDE_CDS_JAVA_HEAP
449 if (UseSharedSpaces &&
450 HeapShared::open_archive_heap_region_mapped() &&
451 _mirrors[T_INT].resolve() != NULL) {
452 assert(HeapShared::is_heap_object_archiving_allowed(), "Sanity");
453
454 // check that all mirrors are mapped also
455 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
456 if (!is_reference_type((BasicType)i)) {
457 oop m = _mirrors[i].resolve();
458 assert(m != NULL, "archived mirrors should not be NULL");
459 }
460 }
461 } else
462 // _mirror[T_INT} could be NULL if archived heap is not mapped.
463 #endif
464 {
465 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
466 BasicType bt = (BasicType)i;
467 if (!is_reference_type(bt)) {
468 oop m = java_lang_Class::create_basic_type_mirror(type2name(bt), bt, CHECK);
469 _mirrors[i] = OopHandle(vm_global(), m);
470 }
471 }
472 }
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::clear_reference_pending_list() {
515 assert_pll_ownership();
516 _reference_pending_list = NULL;
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(&_reference_pending_list, 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(THREAD, 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 // the array of preallocated errors with backtraces
569 objArrayOop Universe::preallocated_out_of_memory_errors() {
570 return (objArrayOop)_preallocated_out_of_memory_error_array.resolve();
571 }
572
573 objArrayOop Universe::out_of_memory_errors() { return (objArrayOop)_out_of_memory_errors.resolve(); }
574
575 oop Universe::out_of_memory_error_java_heap() {
576 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_java_heap));
577 }
578
579 oop Universe::out_of_memory_error_metaspace() {
580 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_metaspace));
581 }
582
583 oop Universe::out_of_memory_error_class_metaspace() {
584 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_class_metaspace));
585 }
586
587 oop Universe::out_of_memory_error_array_size() {
588 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_array_size));
589 }
590
591 oop Universe::out_of_memory_error_gc_overhead_limit() {
592 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_gc_overhead_limit));
593 }
594
595 oop Universe::out_of_memory_error_realloc_objects() {
596 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_realloc_objects));
597 }
598
599 // Throw default _out_of_memory_error_retry object as it will never propagate out of the VM
600 oop Universe::out_of_memory_error_retry() { return out_of_memory_errors()->obj_at(_oom_retry); }
601 oop Universe::delayed_stack_overflow_error_message() { return _delayed_stack_overflow_error_message.resolve(); }
602
603
604 bool Universe::should_fill_in_stack_trace(Handle throwable) {
605 // never attempt to fill in the stack trace of preallocated errors that do not have
606 // backtrace. These errors are kept alive forever and may be "re-used" when all
607 // preallocated errors with backtrace have been consumed. Also need to avoid
608 // a potential loop which could happen if an out of memory occurs when attempting
609 // to allocate the backtrace.
610 objArrayOop preallocated_oom = out_of_memory_errors();
611 for (int i = 0; i < _oom_count; i++) {
612 if (throwable() == preallocated_oom->obj_at(i)) {
613 return false;
614 }
615 }
616 return true;
617 }
618
619
620 oop Universe::gen_out_of_memory_error(oop default_err) {
621 // generate an out of memory error:
622 // - if there is a preallocated error and stack traces are available
623 // (j.l.Throwable is initialized), then return the preallocated
624 // error with a filled in stack trace, and with the message
625 // provided by the default error.
626 // - otherwise, return the default error, without a stack trace.
627 int next;
628 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
629 SystemDictionary::Throwable_klass()->is_initialized()) {
630 next = (int)Atomic::add(&_preallocated_out_of_memory_error_avail_count, -1);
631 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
632 } else {
633 next = -1;
634 }
635 if (next < 0) {
636 // all preallocated errors have been used.
637 // return default
638 return default_err;
639 } else {
640 Thread* THREAD = Thread::current();
641 Handle default_err_h(THREAD, default_err);
642 // get the error object at the slot and set set it to NULL so that the
643 // array isn't keeping it alive anymore.
644 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next));
645 assert(exc() != NULL, "slot has been used already");
646 preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
647
648 // use the message from the default error
649 oop msg = java_lang_Throwable::message(default_err_h());
650 assert(msg != NULL, "no message");
651 java_lang_Throwable::set_message(exc(), msg);
652
653 // populate the stack trace and return it.
654 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
655 return exc();
656 }
657 }
658
659 // Setup preallocated OutOfMemoryError errors
660 void Universe::create_preallocated_out_of_memory_errors(TRAPS) {
661 InstanceKlass* ik = SystemDictionary::OutOfMemoryError_klass();
662 objArrayOop oa = oopFactory::new_objArray(ik, _oom_count, CHECK);
663 objArrayHandle oom_array(THREAD, oa);
664
665 for (int i = 0; i < _oom_count; i++) {
666 oop oom_obj = ik->allocate_instance(CHECK);
667 oom_array->obj_at_put(i, oom_obj);
668 }
669 _out_of_memory_errors = OopHandle(vm_global(), oom_array());
670
671 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK);
672 java_lang_Throwable::set_message(oom_array->obj_at(_oom_java_heap), msg());
673
674 msg = java_lang_String::create_from_str("Metaspace", CHECK);
675 java_lang_Throwable::set_message(oom_array->obj_at(_oom_metaspace), msg());
676
677 msg = java_lang_String::create_from_str("Compressed class space", CHECK);
678 java_lang_Throwable::set_message(oom_array->obj_at(_oom_class_metaspace), msg());
679
680 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK);
681 java_lang_Throwable::set_message(oom_array->obj_at(_oom_array_size), msg());
682
683 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK);
684 java_lang_Throwable::set_message(oom_array->obj_at(_oom_gc_overhead_limit), msg());
685
686 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK);
687 java_lang_Throwable::set_message(oom_array->obj_at(_oom_realloc_objects), msg());
688
689 msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK);
690 java_lang_Throwable::set_message(oom_array->obj_at(_oom_retry), msg());
691
692 // Setup the array of errors that have preallocated backtrace
693 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
694 objArrayOop instance = oopFactory::new_objArray(ik, len, CHECK);
695 _preallocated_out_of_memory_error_array = OopHandle(vm_global(), instance);
696 objArrayHandle preallocated_oom_array(THREAD, instance);
697
698 for (int i=0; i<len; i++) {
699 oop err = ik->allocate_instance(CHECK);
700 Handle err_h(THREAD, err);
701 java_lang_Throwable::allocate_backtrace(err_h, CHECK);
702 preallocated_oom_array->obj_at_put(i, err_h());
703 }
704 _preallocated_out_of_memory_error_avail_count = (jint)len;
705 }
706
707 intptr_t Universe::_non_oop_bits = 0;
708
709 void* Universe::non_oop_word() {
710 // Neither the high bits nor the low bits of this value is allowed
711 // to look like (respectively) the high or low bits of a real oop.
712 //
713 // High and low are CPU-specific notions, but low always includes
714 // the low-order bit. Since oops are always aligned at least mod 4,
715 // setting the low-order bit will ensure that the low half of the
716 // word will never look like that of a real oop.
717 //
718 // Using the OS-supplied non-memory-address word (usually 0 or -1)
719 // will take care of the high bits, however many there are.
720
721 if (_non_oop_bits == 0) {
722 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
723 }
724
725 return (void*)_non_oop_bits;
726 }
727
728 static void initialize_global_behaviours() {
729 CompiledICProtectionBehaviour::set_current(new DefaultICProtectionBehaviour());
730 }
731
732 jint universe_init() {
733 assert(!Universe::_fully_initialized, "called after initialize_vtables");
734 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
735 "LogHeapWordSize is incorrect.");
736 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
737 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
738 "oop size is not not a multiple of HeapWord size");
739
740 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
741
742 initialize_global_behaviours();
743
744 GCLogPrecious::initialize();
745
746 GCConfig::arguments()->initialize_heap_sizes();
747
748 jint status = Universe::initialize_heap();
749 if (status != JNI_OK) {
750 return status;
751 }
752
753 Universe::initialize_tlab();
754
755 Metaspace::global_initialize();
756
757 // Initialize performance counters for metaspaces
758 MetaspaceCounters::initialize_performance_counters();
759 CompressedClassSpaceCounters::initialize_performance_counters();
760
761 AOTLoader::universe_init();
762
763 // Checks 'AfterMemoryInit' constraints.
764 if (!JVMFlagConstraintList::check_constraints(JVMFlagConstraint::AfterMemoryInit)) {
765 return JNI_EINVAL;
766 }
767
768 // Create memory for metadata. Must be after initializing heap for
769 // DumpSharedSpaces.
770 ClassLoaderData::init_null_class_loader_data();
771
772 // We have a heap so create the Method* caches before
773 // Metaspace::initialize_shared_spaces() tries to populate them.
774 Universe::_finalizer_register_cache = new LatestMethodCache();
775 Universe::_loader_addClass_cache = new LatestMethodCache();
776 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
777 Universe::_throw_no_such_method_error_cache = new LatestMethodCache();
778 Universe::_do_stack_walk_cache = new LatestMethodCache();
779
780 #if INCLUDE_CDS
781 if (UseSharedSpaces) {
782 // Read the data structures supporting the shared spaces (shared
783 // system dictionary, symbol table, etc.). After that, access to
784 // the file (other than the mapped regions) is no longer needed, and
785 // the file is closed. Closing the file does not affect the
786 // currently mapped regions.
787 MetaspaceShared::initialize_shared_spaces();
788 StringTable::create_table();
789 } else
790 #endif
791 {
792 SymbolTable::create_table();
793 StringTable::create_table();
794 }
795
796 #if INCLUDE_CDS
797 if (Arguments::is_dumping_archive()) {
798 MetaspaceShared::prepare_for_dumping();
799 }
800 #endif
801
802 if (strlen(VerifySubSet) > 0) {
803 Universe::initialize_verify_flags();
804 }
805
806 ResolvedMethodTable::create_table();
807
808 return JNI_OK;
809 }
810
811 jint Universe::initialize_heap() {
812 assert(_collectedHeap == NULL, "Heap already created");
813 _collectedHeap = GCConfig::arguments()->create_heap();
814
815 log_info(gc)("Using %s", _collectedHeap->name());
816 return _collectedHeap->initialize();
817 }
818
819 void Universe::initialize_tlab() {
820 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
821 if (UseTLAB) {
822 assert(Universe::heap()->supports_tlab_allocation(),
823 "Should support thread-local allocation buffers");
824 ThreadLocalAllocBuffer::startup_initialization();
825 }
826 }
827
828 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
829
830 assert(alignment <= Arguments::conservative_max_heap_alignment(),
831 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
832 alignment, Arguments::conservative_max_heap_alignment());
833
834 size_t total_reserved = align_up(heap_size, alignment);
835 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
836 "heap size is too big for compressed oops");
837
838 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size());
839 assert(!UseLargePages
840 || UseParallelGC
841 || use_large_pages, "Wrong alignment to use large pages");
842
843 // Now create the space.
844 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt);
845
846 if (total_rs.is_reserved()) {
847 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
848 "must be exactly of required size and alignment");
849 // We are good.
850
851 if (AllocateHeapAt != NULL) {
852 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
853 }
854
855 if (UseCompressedOops) {
856 CompressedOops::initialize(total_rs);
857 }
858
859 Universe::calculate_verify_data((HeapWord*)total_rs.base(), (HeapWord*)total_rs.end());
860
861 return total_rs;
862 }
863
864 vm_exit_during_initialization(
865 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
866 total_reserved/K));
867
868 // satisfy compiler
869 ShouldNotReachHere();
870 return ReservedHeapSpace(0, 0, false);
871 }
872
873
874 // It's the caller's responsibility to ensure glitch-freedom
875 // (if required).
876 void Universe::update_heap_info_at_gc() {
877 _heap_capacity_at_last_gc = heap()->capacity();
878 _heap_used_at_last_gc = heap()->used();
879 }
880
881 OopStorage* Universe::vm_weak() {
882 return Universe::_vm_weak;
883 }
884
885 OopStorage* Universe::vm_global() {
886 return Universe::_vm_global;
887 }
888
889 void Universe::oopstorage_init() {
890 Universe::_vm_global = OopStorageSet::create_strong("VM Global");
891 Universe::_vm_weak = OopStorageSet::create_weak("VM Weak");
892 }
893
894 void universe_oopstorage_init() {
895 Universe::oopstorage_init();
896 }
897
898 void initialize_known_method(LatestMethodCache* method_cache,
899 InstanceKlass* ik,
900 const char* method,
901 Symbol* signature,
902 bool is_static, TRAPS)
903 {
904 TempNewSymbol name = SymbolTable::new_symbol(method);
905 Method* m = NULL;
906 // The klass must be linked before looking up the method.
907 if (!ik->link_class_or_fail(THREAD) ||
908 ((m = ik->find_method(name, signature)) == NULL) ||
909 is_static != m->is_static()) {
910 ResourceMark rm(THREAD);
911 // NoSuchMethodException doesn't actually work because it tries to run the
912 // <init> function before java_lang_Class is linked. Print error and exit.
913 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
914 ik->name()->as_C_string(), method));
915 }
916 method_cache->init(ik, m);
917 }
918
919 void Universe::initialize_known_methods(TRAPS) {
920 // Set up static method for registering finalizers
921 initialize_known_method(_finalizer_register_cache,
922 SystemDictionary::Finalizer_klass(),
923 "register",
924 vmSymbols::object_void_signature(), true, CHECK);
925
926 initialize_known_method(_throw_illegal_access_error_cache,
927 SystemDictionary::internal_Unsafe_klass(),
928 "throwIllegalAccessError",
929 vmSymbols::void_method_signature(), true, CHECK);
930
931 initialize_known_method(_throw_no_such_method_error_cache,
932 SystemDictionary::internal_Unsafe_klass(),
933 "throwNoSuchMethodError",
934 vmSymbols::void_method_signature(), true, CHECK);
935
936 // Set up method for registering loaded classes in class loader vector
937 initialize_known_method(_loader_addClass_cache,
938 SystemDictionary::ClassLoader_klass(),
939 "addClass",
940 vmSymbols::class_void_signature(), false, CHECK);
941
942 // Set up method for stack walking
943 initialize_known_method(_do_stack_walk_cache,
944 SystemDictionary::AbstractStackWalker_klass(),
945 "doStackWalk",
946 vmSymbols::doStackWalk_signature(), false, CHECK);
947 }
948
949 void universe2_init() {
950 EXCEPTION_MARK;
951 Universe::genesis(CATCH);
952 }
953
954 // Set after initialization of the module runtime, call_initModuleRuntime
955 void universe_post_module_init() {
956 Universe::_module_initialized = true;
957 }
958
959 bool universe_post_init() {
960 assert(!is_init_completed(), "Error: initialization not yet completed!");
961 Universe::_fully_initialized = true;
962 EXCEPTION_MARK;
963 if (!UseSharedSpaces) {
964 ResourceMark rm;
965 Universe::reinitialize_vtables(CHECK_false);
966 Universe::reinitialize_itables(CHECK_false);
967 }
968
969 HandleMark hm(THREAD);
970 // Setup preallocated empty java.lang.Class array for Method reflection.
971
972 objArrayOop the_empty_class_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
973 Universe::_the_empty_class_array = OopHandle(Universe::vm_global(), the_empty_class_array);
974
975 // Setup preallocated OutOfMemoryError errors
976 Universe::create_preallocated_out_of_memory_errors(CHECK_false);
977
978 oop instance;
979 // Setup preallocated cause message for delayed StackOverflowError
980 if (StackReservedPages > 0) {
981 instance = java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
982 Universe::_delayed_stack_overflow_error_message = OopHandle(Universe::vm_global(), instance);
983 }
984
985 // Setup preallocated NullPointerException
986 // (this is currently used for a cheap & dirty solution in compiler exception handling)
987 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
988 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
989 Universe::_null_ptr_exception_instance = OopHandle(Universe::vm_global(), instance);
990
991 // Setup preallocated ArithmeticException
992 // (this is currently used for a cheap & dirty solution in compiler exception handling)
993 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
994 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
995 Universe::_arithmetic_exception_instance = OopHandle(Universe::vm_global(), instance);
996
997 // Virtual Machine Error for when we get into a situation we can't resolve
998 k = SystemDictionary::VirtualMachineError_klass();
999 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1000 if (!linked) {
1001 tty->print_cr("Unable to link/verify VirtualMachineError class");
1002 return false; // initialization failed
1003 }
1004 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1005 Universe::_virtual_machine_error_instance = OopHandle(Universe::vm_global(), instance);
1006
1007 Handle msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1008 java_lang_Throwable::set_message(Universe::arithmetic_exception_instance(), msg());
1009
1010
1011 Universe::initialize_known_methods(CHECK_false);
1012
1013 // This needs to be done before the first scavenge/gc, since
1014 // it's an input to soft ref clearing policy.
1015 {
1016 MutexLocker x(THREAD, Heap_lock);
1017 Universe::update_heap_info_at_gc();
1018 }
1019
1020 // ("weak") refs processing infrastructure initialization
1021 Universe::heap()->post_initialize();
1022
1023 MemoryService::add_metaspace_memory_pools();
1024
1025 MemoryService::set_universe_heap(Universe::heap());
1026 #if INCLUDE_CDS
1027 MetaspaceShared::post_initialize(CHECK_false);
1028 #endif
1029 return true;
1030 }
1031
1032
1033 void Universe::compute_base_vtable_size() {
1034 _base_vtable_size = ClassLoader::compute_Object_vtable();
1035 }
1036
1037 void Universe::print_on(outputStream* st) {
1038 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1039 st->print_cr("Heap");
1040 heap()->print_on(st);
1041 }
1042
1043 void Universe::print_heap_at_SIGBREAK() {
1044 if (PrintHeapAtSIGBREAK) {
1045 print_on(tty);
1046 tty->cr();
1047 tty->flush();
1048 }
1049 }
1050
1051 void Universe::print_heap_before_gc() {
1052 LogTarget(Debug, gc, heap) lt;
1053 if (lt.is_enabled()) {
1054 LogStream ls(lt);
1055 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1056 ResourceMark rm;
1057 heap()->print_on(&ls);
1058 }
1059 }
1060
1061 void Universe::print_heap_after_gc() {
1062 LogTarget(Debug, gc, heap) lt;
1063 if (lt.is_enabled()) {
1064 LogStream ls(lt);
1065 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1066 ResourceMark rm;
1067 heap()->print_on(&ls);
1068 }
1069 }
1070
1071 void Universe::initialize_verify_flags() {
1072 verify_flags = 0;
1073 const char delimiter[] = " ,";
1074
1075 size_t length = strlen(VerifySubSet);
1076 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1077 strncpy(subset_list, VerifySubSet, length + 1);
1078 char* save_ptr;
1079
1080 char* token = strtok_r(subset_list, delimiter, &save_ptr);
1081 while (token != NULL) {
1082 if (strcmp(token, "threads") == 0) {
1083 verify_flags |= Verify_Threads;
1084 } else if (strcmp(token, "heap") == 0) {
1085 verify_flags |= Verify_Heap;
1086 } else if (strcmp(token, "symbol_table") == 0) {
1087 verify_flags |= Verify_SymbolTable;
1088 } else if (strcmp(token, "string_table") == 0) {
1089 verify_flags |= Verify_StringTable;
1090 } else if (strcmp(token, "codecache") == 0) {
1091 verify_flags |= Verify_CodeCache;
1092 } else if (strcmp(token, "dictionary") == 0) {
1093 verify_flags |= Verify_SystemDictionary;
1094 } else if (strcmp(token, "classloader_data_graph") == 0) {
1095 verify_flags |= Verify_ClassLoaderDataGraph;
1096 } else if (strcmp(token, "metaspace") == 0) {
1097 verify_flags |= Verify_MetaspaceUtils;
1098 } else if (strcmp(token, "jni_handles") == 0) {
1099 verify_flags |= Verify_JNIHandles;
1100 } else if (strcmp(token, "codecache_oops") == 0) {
1101 verify_flags |= Verify_CodeCacheOops;
1102 } else if (strcmp(token, "resolved_method_table") == 0) {
1103 verify_flags |= Verify_ResolvedMethodTable;
1104 } else {
1105 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1106 }
1107 token = strtok_r(NULL, delimiter, &save_ptr);
1108 }
1109 FREE_C_HEAP_ARRAY(char, subset_list);
1110 }
1111
1112 bool Universe::should_verify_subset(uint subset) {
1113 if (verify_flags & subset) {
1114 return true;
1115 }
1116 return false;
1117 }
1118
1119 void Universe::verify(VerifyOption option, const char* prefix) {
1120 // The use of _verify_in_progress is a temporary work around for
1121 // 6320749. Don't bother with a creating a class to set and clear
1122 // it since it is only used in this method and the control flow is
1123 // straight forward.
1124 _verify_in_progress = true;
1125
1126 COMPILER2_PRESENT(
1127 assert(!DerivedPointerTable::is_active(),
1128 "DPT should not be active during verification "
1129 "(of thread stacks below)");
1130 )
1131
1132 ResourceMark rm;
1133 HandleMark hm; // Handles created during verification can be zapped
1134 _verify_count++;
1135
1136 FormatBuffer<> title("Verifying %s", prefix);
1137 GCTraceTime(Info, gc, verify) tm(title.buffer());
1138 if (should_verify_subset(Verify_Threads)) {
1139 log_debug(gc, verify)("Threads");
1140 Threads::verify();
1141 }
1142 if (should_verify_subset(Verify_Heap)) {
1143 log_debug(gc, verify)("Heap");
1144 heap()->verify(option);
1145 }
1146 if (should_verify_subset(Verify_SymbolTable)) {
1147 log_debug(gc, verify)("SymbolTable");
1148 SymbolTable::verify();
1149 }
1150 if (should_verify_subset(Verify_StringTable)) {
1151 log_debug(gc, verify)("StringTable");
1152 StringTable::verify();
1153 }
1154 if (should_verify_subset(Verify_CodeCache)) {
1155 {
1156 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1157 log_debug(gc, verify)("CodeCache");
1158 CodeCache::verify();
1159 }
1160 }
1161 if (should_verify_subset(Verify_SystemDictionary)) {
1162 log_debug(gc, verify)("SystemDictionary");
1163 SystemDictionary::verify();
1164 }
1165 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1166 log_debug(gc, verify)("ClassLoaderDataGraph");
1167 ClassLoaderDataGraph::verify();
1168 }
1169 if (should_verify_subset(Verify_MetaspaceUtils)) {
1170 log_debug(gc, verify)("MetaspaceUtils");
1171 MetaspaceUtils::verify_free_chunks();
1172 }
1173 if (should_verify_subset(Verify_JNIHandles)) {
1174 log_debug(gc, verify)("JNIHandles");
1175 JNIHandles::verify();
1176 }
1177 if (should_verify_subset(Verify_CodeCacheOops)) {
1178 log_debug(gc, verify)("CodeCache Oops");
1179 CodeCache::verify_oops();
1180 }
1181 if (should_verify_subset(Verify_ResolvedMethodTable)) {
1182 log_debug(gc, verify)("ResolvedMethodTable Oops");
1183 ResolvedMethodTable::verify();
1184 }
1185
1186 _verify_in_progress = false;
1187 }
1188
1189
1190 #ifndef PRODUCT
1191 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1192 assert(low_boundary < high_boundary, "bad interval");
1193
1194 // decide which low-order bits we require to be clear:
1195 size_t alignSize = MinObjAlignmentInBytes;
1196 size_t min_object_size = CollectedHeap::min_fill_size();
1197
1198 // make an inclusive limit:
1199 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1200 uintptr_t min = (uintptr_t)low_boundary;
1201 assert(min < max, "bad interval");
1202 uintptr_t diff = max ^ min;
1203
1204 // throw away enough low-order bits to make the diff vanish
1205 uintptr_t mask = (uintptr_t)(-1);
1206 while ((mask & diff) != 0)
1207 mask <<= 1;
1208 uintptr_t bits = (min & mask);
1209 assert(bits == (max & mask), "correct mask");
1210 // check an intermediate value between min and max, just to make sure:
1211 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1212
1213 // require address alignment, too:
1214 mask |= (alignSize - 1);
1215
1216 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1217 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1218 }
1219 _verify_oop_mask = mask;
1220 _verify_oop_bits = bits;
1221 }
1222
1223 // Oop verification (see MacroAssembler::verify_oop)
1224
1225 uintptr_t Universe::verify_oop_mask() {
1226 return _verify_oop_mask;
1227 }
1228
1229 uintptr_t Universe::verify_oop_bits() {
1230 return _verify_oop_bits;
1231 }
1232
1233 uintptr_t Universe::verify_mark_mask() {
1234 return markWord::lock_mask_in_place;
1235 }
1236
1237 uintptr_t Universe::verify_mark_bits() {
1238 intptr_t mask = verify_mark_mask();
1239 intptr_t bits = (intptr_t)markWord::prototype().value();
1240 assert((bits & ~mask) == 0, "no stray header bits");
1241 return bits;
1242 }
1243 #endif // PRODUCT
1244
1245
1246 void LatestMethodCache::init(Klass* k, Method* m) {
1247 if (!UseSharedSpaces) {
1248 _klass = k;
1249 }
1250 #ifndef PRODUCT
1251 else {
1252 // sharing initilization should have already set up _klass
1253 assert(_klass != NULL, "just checking");
1254 }
1255 #endif
1256
1257 _method_idnum = m->method_idnum();
1258 assert(_method_idnum >= 0, "sanity check");
1259 }
1260
1261
1262 Method* LatestMethodCache::get_method() {
1263 if (klass() == NULL) return NULL;
1264 InstanceKlass* ik = InstanceKlass::cast(klass());
1265 Method* m = ik->method_with_idnum(method_idnum());
1266 assert(m != NULL, "sanity check");
1267 return m;
1268 }
1269
1270
1271 #ifdef ASSERT
1272 // Release dummy object(s) at bottom of heap
1273 bool Universe::release_fullgc_alot_dummy() {
1274 MutexLocker ml(FullGCALot_lock);
1275 objArrayOop fullgc_alot_dummy_array = (objArrayOop)_fullgc_alot_dummy_array.resolve();
1276 if (fullgc_alot_dummy_array != NULL) {
1277 if (_fullgc_alot_dummy_next >= fullgc_alot_dummy_array->length()) {
1278 // No more dummies to release, release entire array instead
1279 _fullgc_alot_dummy_array.release(Universe::vm_global());
1280 return false;
1281 }
1282
1283 // Release dummy at bottom of old generation
1284 fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1285 }
1286 return true;
1287 }
1288
1289 #endif // ASSERT