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_c_heap,
107 _oom_metaspace,
108 _oom_class_metaspace,
109 _oom_array_size,
110 _oom_gc_overhead_limit,
111 _oom_realloc_objects,
112 _oom_retry,
113 _oom_count };
114
115 OopHandle Universe::_out_of_memory_errors;
116 OopHandle Universe::_delayed_stack_overflow_error_message;
117 OopHandle Universe::_preallocated_out_of_memory_error_array;
118 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
119
120 OopHandle Universe::_null_ptr_exception_instance;
121 OopHandle Universe::_arithmetic_exception_instance;
122 OopHandle Universe::_virtual_machine_error_instance;
123
124 oop Universe::_reference_pending_list = NULL;
125
126 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
127 LatestMethodCache* Universe::_finalizer_register_cache = NULL;
128 LatestMethodCache* Universe::_loader_addClass_cache = NULL;
129 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL;
130 LatestMethodCache* Universe::_throw_no_such_method_error_cache = NULL;
131 LatestMethodCache* Universe::_do_stack_walk_cache = NULL;
132
133 bool Universe::_verify_in_progress = false;
134 long Universe::verify_flags = Universe::Verify_All;
135
136 Array<int>* Universe::_the_empty_int_array = NULL;
137 Array<u2>* Universe::_the_empty_short_array = NULL;
138 Array<Klass*>* Universe::_the_empty_klass_array = NULL;
139 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = NULL;
140 Array<Method*>* Universe::_the_empty_method_array = NULL;
141
142 // These variables are guarded by FullGCALot_lock.
143 debug_only(OopHandle Universe::_fullgc_alot_dummy_array;)
144 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
145
146 // Heap
147 int Universe::_verify_count = 0;
148
149 // Oop verification (see MacroAssembler::verify_oop)
150 uintptr_t Universe::_verify_oop_mask = 0;
151 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
152
153 int Universe::_base_vtable_size = 0;
154 bool Universe::_bootstrapping = false;
155 bool Universe::_module_initialized = false;
156 bool Universe::_fully_initialized = false;
157
158 size_t Universe::_heap_capacity_at_last_gc;
159 size_t Universe::_heap_used_at_last_gc = 0;
160
161 OopStorage* Universe::_vm_weak = NULL;
162 OopStorage* Universe::_vm_global = NULL;
163
164 CollectedHeap* Universe::_collectedHeap = NULL;
165
166 objArrayOop Universe::the_empty_class_array () {
167 return (objArrayOop)_the_empty_class_array.resolve();
168 }
169
170 oop Universe::main_thread_group() { return _main_thread_group.resolve(); }
171 void Universe::set_main_thread_group(oop group) { _main_thread_group = OopHandle(vm_global(), group); }
172
173 oop Universe::system_thread_group() { return _system_thread_group.resolve(); }
174 void Universe::set_system_thread_group(oop group) { _system_thread_group = OopHandle(vm_global(), group); }
175
176 oop Universe::the_null_string() { return _the_null_string.resolve(); }
177 oop Universe::the_min_jint_string() { return _the_min_jint_string.resolve(); }
178
179 oop Universe::null_ptr_exception_instance() { return _null_ptr_exception_instance.resolve(); }
180 oop Universe::arithmetic_exception_instance() { return _arithmetic_exception_instance.resolve(); }
181 oop Universe::virtual_machine_error_instance() { return _virtual_machine_error_instance.resolve(); }
182
183 oop Universe::the_null_sentinel() { return _the_null_sentinel.resolve(); }
184
185 oop Universe::int_mirror() { return check_mirror(_mirrors[T_INT].resolve()); }
186 oop Universe::float_mirror() { return check_mirror(_mirrors[T_FLOAT].resolve()); }
187 oop Universe::double_mirror() { return check_mirror(_mirrors[T_DOUBLE].resolve()); }
188 oop Universe::byte_mirror() { return check_mirror(_mirrors[T_BYTE].resolve()); }
189 oop Universe::bool_mirror() { return check_mirror(_mirrors[T_BOOLEAN].resolve()); }
190 oop Universe::char_mirror() { return check_mirror(_mirrors[T_CHAR].resolve()); }
191 oop Universe::long_mirror() { return check_mirror(_mirrors[T_LONG].resolve()); }
192 oop Universe::short_mirror() { return check_mirror(_mirrors[T_SHORT].resolve()); }
193 oop Universe::void_mirror() { return check_mirror(_mirrors[T_VOID].resolve()); }
194
195 oop Universe::java_mirror(BasicType t) {
196 assert((uint)t < T_VOID+1, "range check");
197 return check_mirror(_mirrors[t].resolve());
198 }
199
200 // Used by CDS dumping
201 void Universe::replace_mirror(BasicType t, oop new_mirror) {
202 Universe::_mirrors[t].replace(new_mirror);
203 }
204
205 // Not sure why CDS has to do this
206 void Universe::clear_basic_type_mirrors() {
207 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
208 if (!is_reference_type((BasicType)i)) {
209 Universe::_mirrors[i].replace(NULL);
210 }
211 }
212 }
213
214 void Universe::basic_type_classes_do(void f(Klass*)) {
215 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
216 f(_typeArrayKlassObjs[i]);
217 }
218 }
219
220 void Universe::basic_type_classes_do(KlassClosure *closure) {
221 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
222 closure->do_klass(_typeArrayKlassObjs[i]);
223 }
224 }
225
226 void Universe::oops_do(OopClosure* f) {
227
228 f->do_oop(&_reference_pending_list);
229 ThreadsSMRSupport::exiting_threads_oops_do(f);
230 }
231
232 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
233 it->push(&_klass);
234 }
235
236 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
237 for (int i = 0; i < T_LONG+1; i++) {
238 it->push(&_typeArrayKlassObjs[i]);
239 }
240 it->push(&_objectArrayKlassObj);
241
242 it->push(&_the_empty_int_array);
243 it->push(&_the_empty_short_array);
244 it->push(&_the_empty_klass_array);
245 it->push(&_the_empty_instance_klass_array);
246 it->push(&_the_empty_method_array);
247 it->push(&_the_array_interfaces_array);
248
249 _finalizer_register_cache->metaspace_pointers_do(it);
250 _loader_addClass_cache->metaspace_pointers_do(it);
251 _throw_illegal_access_error_cache->metaspace_pointers_do(it);
252 _throw_no_such_method_error_cache->metaspace_pointers_do(it);
253 _do_stack_walk_cache->metaspace_pointers_do(it);
254 }
255
256 // Serialize metadata and pointers to primitive type mirrors in and out of CDS archive
257 void Universe::serialize(SerializeClosure* f) {
258
259 #if INCLUDE_CDS_JAVA_HEAP
260 {
261 oop mirror_oop;
262 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
263 if (f->reading()) {
264 f->do_oop(&mirror_oop); // read from archive
265 assert(oopDesc::is_oop_or_null(mirror_oop), "is oop");
266 // Only create an OopHandle for non-null mirrors
267 if (mirror_oop != NULL) {
268 _mirrors[i] = OopHandle(vm_global(), mirror_oop);
269 }
270 } else {
271 mirror_oop = _mirrors[i].resolve();
272 f->do_oop(&mirror_oop); // write to archive
273 }
274 if (mirror_oop != NULL) { // may be null if archived heap is disabled
275 java_lang_Class::update_archived_primitive_mirror_native_pointers(mirror_oop);
276 }
277 }
278 }
279 #endif
280
281 for (int i = 0; i < T_LONG+1; i++) {
282 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
283 }
284
285 f->do_ptr((void**)&_objectArrayKlassObj);
286 f->do_ptr((void**)&_the_array_interfaces_array);
287 f->do_ptr((void**)&_the_empty_int_array);
288 f->do_ptr((void**)&_the_empty_short_array);
289 f->do_ptr((void**)&_the_empty_method_array);
290 f->do_ptr((void**)&_the_empty_klass_array);
291 f->do_ptr((void**)&_the_empty_instance_klass_array);
292 _finalizer_register_cache->serialize(f);
293 _loader_addClass_cache->serialize(f);
294 _throw_illegal_access_error_cache->serialize(f);
295 _throw_no_such_method_error_cache->serialize(f);
296 _do_stack_walk_cache->serialize(f);
297 }
298
299
300 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
301 if (size < alignment || size % alignment != 0) {
302 vm_exit_during_initialization(
303 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
304 }
305 }
306
307 void initialize_basic_type_klass(Klass* k, TRAPS) {
308 Klass* ok = SystemDictionary::Object_klass();
309 #if INCLUDE_CDS
310 if (UseSharedSpaces) {
311 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
312 assert(k->super() == ok, "u3");
313 if (k->is_instance_klass()) {
314 InstanceKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), NULL, CHECK);
315 } else {
316 ArrayKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), CHECK);
317 }
318 } else
319 #endif
320 {
321 k->initialize_supers(ok, NULL, CHECK);
322 }
323 k->append_to_sibling_list();
324 }
325
326 void Universe::genesis(TRAPS) {
327 ResourceMark rm(THREAD);
328
329 { AutoModifyRestore<bool> temporarily(_bootstrapping, true);
330
331 { MutexLocker mc(THREAD, Compile_lock);
332
333 java_lang_Class::allocate_fixup_lists();
334
335 // determine base vtable size; without that we cannot create the array klasses
336 compute_base_vtable_size();
337
338 if (!UseSharedSpaces) {
339 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
340 _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK);
341 }
342
343 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
344
345 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
346 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
347 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
348 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
349 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
350 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK);
351 }
352 }
353
354 vmSymbols::initialize(CHECK);
355
356 SystemDictionary::initialize(CHECK);
357
358 // Create string constants
359 oop s = StringTable::intern("null", CHECK);
360 _the_null_string = OopHandle(vm_global(), s);
361 s = StringTable::intern("-2147483648", CHECK);
362 _the_min_jint_string = OopHandle(vm_global(), s);
363
364
365 #if INCLUDE_CDS
366 if (UseSharedSpaces) {
367 // Verify shared interfaces array.
368 assert(_the_array_interfaces_array->at(0) ==
369 SystemDictionary::Cloneable_klass(), "u3");
370 assert(_the_array_interfaces_array->at(1) ==
371 SystemDictionary::Serializable_klass(), "u3");
372 } else
373 #endif
374 {
375 // Set up shared interfaces array. (Do this before supers are set up.)
376 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
377 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
378 }
379
380 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
381 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
382 initialize_basic_type_klass(floatArrayKlassObj(), CHECK);
383 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
384 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
385 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
386 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
387 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
388 } // end of core bootstrapping
389
390 {
391 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
392 _the_null_sentinel = OopHandle(vm_global(), tns());
393 }
394
395 // Maybe this could be lifted up now that object array can be initialized
396 // during the bootstrapping.
397
398 // OLD
399 // Initialize _objectArrayKlass after core bootstraping to make
400 // sure the super class is set up properly for _objectArrayKlass.
401 // ---
402 // NEW
403 // Since some of the old system object arrays have been converted to
404 // ordinary object arrays, _objectArrayKlass will be loaded when
405 // SystemDictionary::initialize(CHECK); is run. See the extra check
406 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
407 _objectArrayKlassObj = InstanceKlass::
408 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
409 // OLD
410 // Add the class to the class hierarchy manually to make sure that
411 // its vtable is initialized after core bootstrapping is completed.
412 // ---
413 // New
414 // Have already been initialized.
415 _objectArrayKlassObj->append_to_sibling_list();
416
417 #ifdef ASSERT
418 if (FullGCALot) {
419 // Allocate an array of dummy objects.
420 // We'd like these to be at the bottom of the old generation,
421 // so that when we free one and then collect,
422 // (almost) the whole heap moves
423 // and we find out if we actually update all the oops correctly.
424 // But we can't allocate directly in the old generation,
425 // so we allocate wherever, and hope that the first collection
426 // moves these objects to the bottom of the old generation.
427 int size = FullGCALotDummies * 2;
428
429 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
430 objArrayHandle dummy_array(THREAD, naked_array);
431 int i = 0;
432 while (i < size) {
433 // Allocate dummy in old generation
434 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK);
435 dummy_array->obj_at_put(i++, dummy);
436 }
437 {
438 // Only modify the global variable inside the mutex.
439 // If we had a race to here, the other dummy_array instances
440 // and their elements just get dropped on the floor, which is fine.
441 MutexLocker ml(THREAD, FullGCALot_lock);
442 if (_fullgc_alot_dummy_array.is_empty()) {
443 _fullgc_alot_dummy_array = OopHandle(vm_global(), dummy_array());
444 }
445 }
446 assert(i == ((objArrayOop)_fullgc_alot_dummy_array.resolve())->length(), "just checking");
447 }
448 #endif
449 }
450
451 void Universe::initialize_basic_type_mirrors(TRAPS) {
452 #if INCLUDE_CDS_JAVA_HEAP
453 if (UseSharedSpaces &&
454 HeapShared::open_archive_heap_region_mapped() &&
455 _mirrors[T_INT].resolve() != NULL) {
456 assert(HeapShared::is_heap_object_archiving_allowed(), "Sanity");
457
458 // check that all mirrors are mapped also
459 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
460 if (!is_reference_type((BasicType)i)) {
461 oop m = _mirrors[i].resolve();
462 assert(m != NULL, "archived mirrors should not be NULL");
463 }
464 }
465 } else
466 // _mirror[T_INT} could be NULL if archived heap is not mapped.
467 #endif
468 {
469 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
470 BasicType bt = (BasicType)i;
471 if (!is_reference_type(bt)) {
472 oop m = java_lang_Class::create_basic_type_mirror(type2name(bt), bt, CHECK);
473 _mirrors[i] = OopHandle(vm_global(), m);
474 }
475 }
476 }
477 }
478
479 void Universe::fixup_mirrors(TRAPS) {
480 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
481 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
482 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
483 // that the number of objects allocated at this point is very small.
484 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
485 HandleMark hm(THREAD);
486
487 if (!UseSharedSpaces) {
488 // Cache the start of the static fields
489 InstanceMirrorKlass::init_offset_of_static_fields();
490 }
491
492 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
493 int list_length = list->length();
494 for (int i = 0; i < list_length; i++) {
495 Klass* k = list->at(i);
496 assert(k->is_klass(), "List should only hold classes");
497 EXCEPTION_MARK;
498 java_lang_Class::fixup_mirror(k, CATCH);
499 }
500 delete java_lang_Class::fixup_mirror_list();
501 java_lang_Class::set_fixup_mirror_list(NULL);
502 }
503
504 #define assert_pll_locked(test) \
505 assert(Heap_lock->test(), "Reference pending list access requires lock")
506
507 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
508
509 oop Universe::reference_pending_list() {
510 if (Thread::current()->is_VM_thread()) {
511 assert_pll_locked(is_locked);
512 } else {
513 assert_pll_ownership();
514 }
515 return _reference_pending_list;
516 }
517
518 void Universe::clear_reference_pending_list() {
519 assert_pll_ownership();
520 _reference_pending_list = NULL;
521 }
522
523 bool Universe::has_reference_pending_list() {
524 assert_pll_ownership();
525 return _reference_pending_list != NULL;
526 }
527
528 oop Universe::swap_reference_pending_list(oop list) {
529 assert_pll_locked(is_locked);
530 return Atomic::xchg(&_reference_pending_list, list);
531 }
532
533 #undef assert_pll_locked
534 #undef assert_pll_ownership
535
536 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) {
537 // init vtable of k and all subclasses
538 ko->vtable().initialize_vtable(false, CHECK);
539 if (ko->is_instance_klass()) {
540 for (Klass* sk = ko->subklass();
541 sk != NULL;
542 sk = sk->next_sibling()) {
543 reinitialize_vtable_of(sk, CHECK);
544 }
545 }
546 }
547
548 void Universe::reinitialize_vtables(TRAPS) {
549 // The vtables are initialized by starting at java.lang.Object and
550 // initializing through the subclass links, so that the super
551 // classes are always initialized first.
552 Klass* ok = SystemDictionary::Object_klass();
553 Universe::reinitialize_vtable_of(ok, THREAD);
554 }
555
556
557 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) {
558 k->itable().initialize_itable(false, CHECK);
559 }
560
561
562 void Universe::reinitialize_itables(TRAPS) {
563 MutexLocker mcld(THREAD, ClassLoaderDataGraph_lock);
564 ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK);
565 }
566
567
568 bool Universe::on_page_boundary(void* addr) {
569 return is_aligned(addr, os::vm_page_size());
570 }
571
572 // the array of preallocated errors with backtraces
573 objArrayOop Universe::preallocated_out_of_memory_errors() {
574 return (objArrayOop)_preallocated_out_of_memory_error_array.resolve();
575 }
576
577 objArrayOop Universe::out_of_memory_errors() { return (objArrayOop)_out_of_memory_errors.resolve(); }
578
579 oop Universe::out_of_memory_error_java_heap() {
580 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_java_heap));
581 }
582
583 oop Universe::out_of_memory_error_c_heap() {
584 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_c_heap));
585 }
586
587 oop Universe::out_of_memory_error_metaspace() {
588 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_metaspace));
589 }
590
591 oop Universe::out_of_memory_error_class_metaspace() {
592 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_class_metaspace));
593 }
594
595 oop Universe::out_of_memory_error_array_size() {
596 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_array_size));
597 }
598
599 oop Universe::out_of_memory_error_gc_overhead_limit() {
600 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_gc_overhead_limit));
601 }
602
603 oop Universe::out_of_memory_error_realloc_objects() {
604 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_realloc_objects));
605 }
606
607 // Throw default _out_of_memory_error_retry object as it will never propagate out of the VM
608 oop Universe::out_of_memory_error_retry() { return out_of_memory_errors()->obj_at(_oom_retry); }
609 oop Universe::delayed_stack_overflow_error_message() { return _delayed_stack_overflow_error_message.resolve(); }
610
611
612 bool Universe::should_fill_in_stack_trace(Handle throwable) {
613 // never attempt to fill in the stack trace of preallocated errors that do not have
614 // backtrace. These errors are kept alive forever and may be "re-used" when all
615 // preallocated errors with backtrace have been consumed. Also need to avoid
616 // a potential loop which could happen if an out of memory occurs when attempting
617 // to allocate the backtrace.
618 objArrayOop preallocated_oom = out_of_memory_errors();
619 for (int i = 0; i < _oom_count; i++) {
620 if (throwable() == preallocated_oom->obj_at(i)) {
621 return false;
622 }
623 }
624 return true;
625 }
626
627
628 oop Universe::gen_out_of_memory_error(oop default_err) {
629 // generate an out of memory error:
630 // - if there is a preallocated error and stack traces are available
631 // (j.l.Throwable is initialized), then return the preallocated
632 // error with a filled in stack trace, and with the message
633 // provided by the default error.
634 // - otherwise, return the default error, without a stack trace.
635 int next;
636 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
637 SystemDictionary::Throwable_klass()->is_initialized()) {
638 next = (int)Atomic::add(&_preallocated_out_of_memory_error_avail_count, -1);
639 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
640 } else {
641 next = -1;
642 }
643 if (next < 0) {
644 // all preallocated errors have been used.
645 // return default
646 return default_err;
647 } else {
648 Thread* THREAD = Thread::current();
649 Handle default_err_h(THREAD, default_err);
650 // get the error object at the slot and set set it to NULL so that the
651 // array isn't keeping it alive anymore.
652 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next));
653 assert(exc() != NULL, "slot has been used already");
654 preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
655
656 // use the message from the default error
657 oop msg = java_lang_Throwable::message(default_err_h());
658 assert(msg != NULL, "no message");
659 java_lang_Throwable::set_message(exc(), msg);
660
661 // populate the stack trace and return it.
662 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
663 return exc();
664 }
665 }
666
667 // Setup preallocated OutOfMemoryError errors
668 void Universe::create_preallocated_out_of_memory_errors(TRAPS) {
669 InstanceKlass* ik = SystemDictionary::OutOfMemoryError_klass();
670 objArrayOop oa = oopFactory::new_objArray(ik, _oom_count, CHECK);
671 objArrayHandle oom_array(THREAD, oa);
672
673 for (int i = 0; i < _oom_count; i++) {
674 oop oom_obj = ik->allocate_instance(CHECK);
675 oom_array->obj_at_put(i, oom_obj);
676 }
677 _out_of_memory_errors = OopHandle(vm_global(), oom_array());
678
679 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK);
680 java_lang_Throwable::set_message(oom_array->obj_at(_oom_java_heap), msg());
681
682 msg = java_lang_String::create_from_str("C heap space", CHECK);
683 java_lang_Throwable::set_message(oom_array->obj_at(_oom_c_heap), msg());
684
685 msg = java_lang_String::create_from_str("Metaspace", CHECK);
686 java_lang_Throwable::set_message(oom_array->obj_at(_oom_metaspace), msg());
687
688 msg = java_lang_String::create_from_str("Compressed class space", CHECK);
689 java_lang_Throwable::set_message(oom_array->obj_at(_oom_class_metaspace), msg());
690
691 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK);
692 java_lang_Throwable::set_message(oom_array->obj_at(_oom_array_size), msg());
693
694 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK);
695 java_lang_Throwable::set_message(oom_array->obj_at(_oom_gc_overhead_limit), msg());
696
697 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK);
698 java_lang_Throwable::set_message(oom_array->obj_at(_oom_realloc_objects), msg());
699
700 msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK);
701 java_lang_Throwable::set_message(oom_array->obj_at(_oom_retry), msg());
702
703 // Setup the array of errors that have preallocated backtrace
704 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
705 objArrayOop instance = oopFactory::new_objArray(ik, len, CHECK);
706 _preallocated_out_of_memory_error_array = OopHandle(vm_global(), instance);
707 objArrayHandle preallocated_oom_array(THREAD, instance);
708
709 for (int i=0; i<len; i++) {
710 oop err = ik->allocate_instance(CHECK);
711 Handle err_h(THREAD, err);
712 java_lang_Throwable::allocate_backtrace(err_h, CHECK);
713 preallocated_oom_array->obj_at_put(i, err_h());
714 }
715 _preallocated_out_of_memory_error_avail_count = (jint)len;
716 }
717
718 intptr_t Universe::_non_oop_bits = 0;
719
720 void* Universe::non_oop_word() {
721 // Neither the high bits nor the low bits of this value is allowed
722 // to look like (respectively) the high or low bits of a real oop.
723 //
724 // High and low are CPU-specific notions, but low always includes
725 // the low-order bit. Since oops are always aligned at least mod 4,
726 // setting the low-order bit will ensure that the low half of the
727 // word will never look like that of a real oop.
728 //
729 // Using the OS-supplied non-memory-address word (usually 0 or -1)
730 // will take care of the high bits, however many there are.
731
732 if (_non_oop_bits == 0) {
733 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
734 }
735
736 return (void*)_non_oop_bits;
737 }
738
739 static void initialize_global_behaviours() {
740 CompiledICProtectionBehaviour::set_current(new DefaultICProtectionBehaviour());
741 }
742
743 jint universe_init() {
744 assert(!Universe::_fully_initialized, "called after initialize_vtables");
745 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
746 "LogHeapWordSize is incorrect.");
747 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
748 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
749 "oop size is not not a multiple of HeapWord size");
750
751 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
752
753 initialize_global_behaviours();
754
755 GCLogPrecious::initialize();
756
757 GCConfig::arguments()->initialize_heap_sizes();
758
759 jint status = Universe::initialize_heap();
760 if (status != JNI_OK) {
761 return status;
762 }
763
764 Universe::initialize_tlab();
765
766 Metaspace::global_initialize();
767
768 // Initialize performance counters for metaspaces
769 MetaspaceCounters::initialize_performance_counters();
770 CompressedClassSpaceCounters::initialize_performance_counters();
771
772 AOTLoader::universe_init();
773
774 // Checks 'AfterMemoryInit' constraints.
775 if (!JVMFlagConstraintList::check_constraints(JVMFlagConstraint::AfterMemoryInit)) {
776 return JNI_EINVAL;
777 }
778
779 // Create memory for metadata. Must be after initializing heap for
780 // DumpSharedSpaces.
781 ClassLoaderData::init_null_class_loader_data();
782
783 // We have a heap so create the Method* caches before
784 // Metaspace::initialize_shared_spaces() tries to populate them.
785 Universe::_finalizer_register_cache = new LatestMethodCache();
786 Universe::_loader_addClass_cache = new LatestMethodCache();
787 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
788 Universe::_throw_no_such_method_error_cache = new LatestMethodCache();
789 Universe::_do_stack_walk_cache = new LatestMethodCache();
790
791 #if INCLUDE_CDS
792 if (UseSharedSpaces) {
793 // Read the data structures supporting the shared spaces (shared
794 // system dictionary, symbol table, etc.). After that, access to
795 // the file (other than the mapped regions) is no longer needed, and
796 // the file is closed. Closing the file does not affect the
797 // currently mapped regions.
798 MetaspaceShared::initialize_shared_spaces();
799 StringTable::create_table();
800 } else
801 #endif
802 {
803 SymbolTable::create_table();
804 StringTable::create_table();
805 }
806
807 #if INCLUDE_CDS
808 if (Arguments::is_dumping_archive()) {
809 MetaspaceShared::prepare_for_dumping();
810 }
811 #endif
812
813 if (strlen(VerifySubSet) > 0) {
814 Universe::initialize_verify_flags();
815 }
816
817 ResolvedMethodTable::create_table();
818
819 return JNI_OK;
820 }
821
822 jint Universe::initialize_heap() {
823 assert(_collectedHeap == NULL, "Heap already created");
824 _collectedHeap = GCConfig::arguments()->create_heap();
825
826 log_info(gc)("Using %s", _collectedHeap->name());
827 return _collectedHeap->initialize();
828 }
829
830 void Universe::initialize_tlab() {
831 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
832 if (UseTLAB) {
833 assert(Universe::heap()->supports_tlab_allocation(),
834 "Should support thread-local allocation buffers");
835 ThreadLocalAllocBuffer::startup_initialization();
836 }
837 }
838
839 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
840
841 assert(alignment <= Arguments::conservative_max_heap_alignment(),
842 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
843 alignment, Arguments::conservative_max_heap_alignment());
844
845 size_t total_reserved = align_up(heap_size, alignment);
846 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
847 "heap size is too big for compressed oops");
848
849 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size());
850 assert(!UseLargePages
851 || UseParallelGC
852 || use_large_pages, "Wrong alignment to use large pages");
853
854 // Now create the space.
855 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt);
856
857 if (total_rs.is_reserved()) {
858 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
859 "must be exactly of required size and alignment");
860 // We are good.
861
862 if (AllocateHeapAt != NULL) {
863 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
864 }
865
866 if (UseCompressedOops) {
867 CompressedOops::initialize(total_rs);
868 }
869
870 Universe::calculate_verify_data((HeapWord*)total_rs.base(), (HeapWord*)total_rs.end());
871
872 return total_rs;
873 }
874
875 vm_exit_during_initialization(
876 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
877 total_reserved/K));
878
879 // satisfy compiler
880 ShouldNotReachHere();
881 return ReservedHeapSpace(0, 0, false);
882 }
883
884
885 // It's the caller's responsibility to ensure glitch-freedom
886 // (if required).
887 void Universe::update_heap_info_at_gc() {
888 _heap_capacity_at_last_gc = heap()->capacity();
889 _heap_used_at_last_gc = heap()->used();
890 }
891
892 OopStorage* Universe::vm_weak() {
893 return Universe::_vm_weak;
894 }
895
896 OopStorage* Universe::vm_global() {
897 return Universe::_vm_global;
898 }
899
900 void Universe::oopstorage_init() {
901 Universe::_vm_global = OopStorageSet::create_strong("VM Global");
902 Universe::_vm_weak = OopStorageSet::create_weak("VM Weak");
903 }
904
905 void universe_oopstorage_init() {
906 Universe::oopstorage_init();
907 }
908
909 void initialize_known_method(LatestMethodCache* method_cache,
910 InstanceKlass* ik,
911 const char* method,
912 Symbol* signature,
913 bool is_static, TRAPS)
914 {
915 TempNewSymbol name = SymbolTable::new_symbol(method);
916 Method* m = NULL;
917 // The klass must be linked before looking up the method.
918 if (!ik->link_class_or_fail(THREAD) ||
919 ((m = ik->find_method(name, signature)) == NULL) ||
920 is_static != m->is_static()) {
921 ResourceMark rm(THREAD);
922 // NoSuchMethodException doesn't actually work because it tries to run the
923 // <init> function before java_lang_Class is linked. Print error and exit.
924 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
925 ik->name()->as_C_string(), method));
926 }
927 method_cache->init(ik, m);
928 }
929
930 void Universe::initialize_known_methods(TRAPS) {
931 // Set up static method for registering finalizers
932 initialize_known_method(_finalizer_register_cache,
933 SystemDictionary::Finalizer_klass(),
934 "register",
935 vmSymbols::object_void_signature(), true, CHECK);
936
937 initialize_known_method(_throw_illegal_access_error_cache,
938 SystemDictionary::internal_Unsafe_klass(),
939 "throwIllegalAccessError",
940 vmSymbols::void_method_signature(), true, CHECK);
941
942 initialize_known_method(_throw_no_such_method_error_cache,
943 SystemDictionary::internal_Unsafe_klass(),
944 "throwNoSuchMethodError",
945 vmSymbols::void_method_signature(), true, CHECK);
946
947 // Set up method for registering loaded classes in class loader vector
948 initialize_known_method(_loader_addClass_cache,
949 SystemDictionary::ClassLoader_klass(),
950 "addClass",
951 vmSymbols::class_void_signature(), false, CHECK);
952
953 // Set up method for stack walking
954 initialize_known_method(_do_stack_walk_cache,
955 SystemDictionary::AbstractStackWalker_klass(),
956 "doStackWalk",
957 vmSymbols::doStackWalk_signature(), false, CHECK);
958 }
959
960 void universe2_init() {
961 EXCEPTION_MARK;
962 Universe::genesis(CATCH);
963 }
964
965 // Set after initialization of the module runtime, call_initModuleRuntime
966 void universe_post_module_init() {
967 Universe::_module_initialized = true;
968 }
969
970 bool universe_post_init() {
971 assert(!is_init_completed(), "Error: initialization not yet completed!");
972 Universe::_fully_initialized = true;
973 EXCEPTION_MARK;
974 if (!UseSharedSpaces) {
975 ResourceMark rm;
976 Universe::reinitialize_vtables(CHECK_false);
977 Universe::reinitialize_itables(CHECK_false);
978 }
979
980 HandleMark hm(THREAD);
981 // Setup preallocated empty java.lang.Class array for Method reflection.
982
983 objArrayOop the_empty_class_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
984 Universe::_the_empty_class_array = OopHandle(Universe::vm_global(), the_empty_class_array);
985
986 // Setup preallocated OutOfMemoryError errors
987 Universe::create_preallocated_out_of_memory_errors(CHECK_false);
988
989 oop instance;
990 // Setup preallocated cause message for delayed StackOverflowError
991 if (StackReservedPages > 0) {
992 instance = java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
993 Universe::_delayed_stack_overflow_error_message = OopHandle(Universe::vm_global(), instance);
994 }
995
996 // Setup preallocated NullPointerException
997 // (this is currently used for a cheap & dirty solution in compiler exception handling)
998 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
999 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1000 Universe::_null_ptr_exception_instance = OopHandle(Universe::vm_global(), instance);
1001
1002 // Setup preallocated ArithmeticException
1003 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1004 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
1005 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1006 Universe::_arithmetic_exception_instance = OopHandle(Universe::vm_global(), instance);
1007
1008 // Virtual Machine Error for when we get into a situation we can't resolve
1009 k = SystemDictionary::VirtualMachineError_klass();
1010 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1011 if (!linked) {
1012 tty->print_cr("Unable to link/verify VirtualMachineError class");
1013 return false; // initialization failed
1014 }
1015 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1016 Universe::_virtual_machine_error_instance = OopHandle(Universe::vm_global(), instance);
1017
1018 Handle msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1019 java_lang_Throwable::set_message(Universe::arithmetic_exception_instance(), msg());
1020
1021 Universe::initialize_known_methods(CHECK_false);
1022
1023 // This needs to be done before the first scavenge/gc, since
1024 // it's an input to soft ref clearing policy.
1025 {
1026 MutexLocker x(THREAD, Heap_lock);
1027 Universe::update_heap_info_at_gc();
1028 }
1029
1030 // ("weak") refs processing infrastructure initialization
1031 Universe::heap()->post_initialize();
1032
1033 MemoryService::add_metaspace_memory_pools();
1034
1035 MemoryService::set_universe_heap(Universe::heap());
1036 #if INCLUDE_CDS
1037 MetaspaceShared::post_initialize(CHECK_false);
1038 #endif
1039 return true;
1040 }
1041
1042
1043 void Universe::compute_base_vtable_size() {
1044 _base_vtable_size = ClassLoader::compute_Object_vtable();
1045 }
1046
1047 void Universe::print_on(outputStream* st) {
1048 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1049 st->print_cr("Heap");
1050 heap()->print_on(st);
1051 }
1052
1053 void Universe::print_heap_at_SIGBREAK() {
1054 if (PrintHeapAtSIGBREAK) {
1055 print_on(tty);
1056 tty->cr();
1057 tty->flush();
1058 }
1059 }
1060
1061 void Universe::print_heap_before_gc() {
1062 LogTarget(Debug, gc, heap) lt;
1063 if (lt.is_enabled()) {
1064 LogStream ls(lt);
1065 ls.print("Heap before 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::print_heap_after_gc() {
1072 LogTarget(Debug, gc, heap) lt;
1073 if (lt.is_enabled()) {
1074 LogStream ls(lt);
1075 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1076 ResourceMark rm;
1077 heap()->print_on(&ls);
1078 }
1079 }
1080
1081 void Universe::initialize_verify_flags() {
1082 verify_flags = 0;
1083 const char delimiter[] = " ,";
1084
1085 size_t length = strlen(VerifySubSet);
1086 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1087 strncpy(subset_list, VerifySubSet, length + 1);
1088 char* save_ptr;
1089
1090 char* token = strtok_r(subset_list, delimiter, &save_ptr);
1091 while (token != NULL) {
1092 if (strcmp(token, "threads") == 0) {
1093 verify_flags |= Verify_Threads;
1094 } else if (strcmp(token, "heap") == 0) {
1095 verify_flags |= Verify_Heap;
1096 } else if (strcmp(token, "symbol_table") == 0) {
1097 verify_flags |= Verify_SymbolTable;
1098 } else if (strcmp(token, "string_table") == 0) {
1099 verify_flags |= Verify_StringTable;
1100 } else if (strcmp(token, "codecache") == 0) {
1101 verify_flags |= Verify_CodeCache;
1102 } else if (strcmp(token, "dictionary") == 0) {
1103 verify_flags |= Verify_SystemDictionary;
1104 } else if (strcmp(token, "classloader_data_graph") == 0) {
1105 verify_flags |= Verify_ClassLoaderDataGraph;
1106 } else if (strcmp(token, "metaspace") == 0) {
1107 verify_flags |= Verify_MetaspaceUtils;
1108 } else if (strcmp(token, "jni_handles") == 0) {
1109 verify_flags |= Verify_JNIHandles;
1110 } else if (strcmp(token, "codecache_oops") == 0) {
1111 verify_flags |= Verify_CodeCacheOops;
1112 } else if (strcmp(token, "resolved_method_table") == 0) {
1113 verify_flags |= Verify_ResolvedMethodTable;
1114 } else {
1115 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1116 }
1117 token = strtok_r(NULL, delimiter, &save_ptr);
1118 }
1119 FREE_C_HEAP_ARRAY(char, subset_list);
1120 }
1121
1122 bool Universe::should_verify_subset(uint subset) {
1123 if (verify_flags & subset) {
1124 return true;
1125 }
1126 return false;
1127 }
1128
1129 void Universe::verify(VerifyOption option, const char* prefix) {
1130 // The use of _verify_in_progress is a temporary work around for
1131 // 6320749. Don't bother with a creating a class to set and clear
1132 // it since it is only used in this method and the control flow is
1133 // straight forward.
1134 _verify_in_progress = true;
1135
1136 COMPILER2_PRESENT(
1137 assert(!DerivedPointerTable::is_active(),
1138 "DPT should not be active during verification "
1139 "(of thread stacks below)");
1140 )
1141
1142 ResourceMark rm;
1143 HandleMark hm; // Handles created during verification can be zapped
1144 _verify_count++;
1145
1146 FormatBuffer<> title("Verifying %s", prefix);
1147 GCTraceTime(Info, gc, verify) tm(title.buffer());
1148 if (should_verify_subset(Verify_Threads)) {
1149 log_debug(gc, verify)("Threads");
1150 Threads::verify();
1151 }
1152 if (should_verify_subset(Verify_Heap)) {
1153 log_debug(gc, verify)("Heap");
1154 heap()->verify(option);
1155 }
1156 if (should_verify_subset(Verify_SymbolTable)) {
1157 log_debug(gc, verify)("SymbolTable");
1158 SymbolTable::verify();
1159 }
1160 if (should_verify_subset(Verify_StringTable)) {
1161 log_debug(gc, verify)("StringTable");
1162 StringTable::verify();
1163 }
1164 if (should_verify_subset(Verify_CodeCache)) {
1165 {
1166 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1167 log_debug(gc, verify)("CodeCache");
1168 CodeCache::verify();
1169 }
1170 }
1171 if (should_verify_subset(Verify_SystemDictionary)) {
1172 log_debug(gc, verify)("SystemDictionary");
1173 SystemDictionary::verify();
1174 }
1175 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1176 log_debug(gc, verify)("ClassLoaderDataGraph");
1177 ClassLoaderDataGraph::verify();
1178 }
1179 if (should_verify_subset(Verify_MetaspaceUtils)) {
1180 log_debug(gc, verify)("MetaspaceUtils");
1181 MetaspaceUtils::verify_free_chunks();
1182 }
1183 if (should_verify_subset(Verify_JNIHandles)) {
1184 log_debug(gc, verify)("JNIHandles");
1185 JNIHandles::verify();
1186 }
1187 if (should_verify_subset(Verify_CodeCacheOops)) {
1188 log_debug(gc, verify)("CodeCache Oops");
1189 CodeCache::verify_oops();
1190 }
1191 if (should_verify_subset(Verify_ResolvedMethodTable)) {
1192 log_debug(gc, verify)("ResolvedMethodTable Oops");
1193 ResolvedMethodTable::verify();
1194 }
1195
1196 _verify_in_progress = false;
1197 }
1198
1199
1200 #ifndef PRODUCT
1201 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1202 assert(low_boundary < high_boundary, "bad interval");
1203
1204 // decide which low-order bits we require to be clear:
1205 size_t alignSize = MinObjAlignmentInBytes;
1206 size_t min_object_size = CollectedHeap::min_fill_size();
1207
1208 // make an inclusive limit:
1209 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1210 uintptr_t min = (uintptr_t)low_boundary;
1211 assert(min < max, "bad interval");
1212 uintptr_t diff = max ^ min;
1213
1214 // throw away enough low-order bits to make the diff vanish
1215 uintptr_t mask = (uintptr_t)(-1);
1216 while ((mask & diff) != 0)
1217 mask <<= 1;
1218 uintptr_t bits = (min & mask);
1219 assert(bits == (max & mask), "correct mask");
1220 // check an intermediate value between min and max, just to make sure:
1221 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1222
1223 // require address alignment, too:
1224 mask |= (alignSize - 1);
1225
1226 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1227 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1228 }
1229 _verify_oop_mask = mask;
1230 _verify_oop_bits = bits;
1231 }
1232
1233 // Oop verification (see MacroAssembler::verify_oop)
1234
1235 uintptr_t Universe::verify_oop_mask() {
1236 return _verify_oop_mask;
1237 }
1238
1239 uintptr_t Universe::verify_oop_bits() {
1240 return _verify_oop_bits;
1241 }
1242
1243 uintptr_t Universe::verify_mark_mask() {
1244 return markWord::lock_mask_in_place;
1245 }
1246
1247 uintptr_t Universe::verify_mark_bits() {
1248 intptr_t mask = verify_mark_mask();
1249 intptr_t bits = (intptr_t)markWord::prototype().value();
1250 assert((bits & ~mask) == 0, "no stray header bits");
1251 return bits;
1252 }
1253 #endif // PRODUCT
1254
1255
1256 void LatestMethodCache::init(Klass* k, Method* m) {
1257 if (!UseSharedSpaces) {
1258 _klass = k;
1259 }
1260 #ifndef PRODUCT
1261 else {
1262 // sharing initilization should have already set up _klass
1263 assert(_klass != NULL, "just checking");
1264 }
1265 #endif
1266
1267 _method_idnum = m->method_idnum();
1268 assert(_method_idnum >= 0, "sanity check");
1269 }
1270
1271
1272 Method* LatestMethodCache::get_method() {
1273 if (klass() == NULL) return NULL;
1274 InstanceKlass* ik = InstanceKlass::cast(klass());
1275 Method* m = ik->method_with_idnum(method_idnum());
1276 assert(m != NULL, "sanity check");
1277 return m;
1278 }
1279
1280
1281 #ifdef ASSERT
1282 // Release dummy object(s) at bottom of heap
1283 bool Universe::release_fullgc_alot_dummy() {
1284 MutexLocker ml(FullGCALot_lock);
1285 objArrayOop fullgc_alot_dummy_array = (objArrayOop)_fullgc_alot_dummy_array.resolve();
1286 if (fullgc_alot_dummy_array != NULL) {
1287 if (_fullgc_alot_dummy_next >= fullgc_alot_dummy_array->length()) {
1288 // No more dummies to release, release entire array instead
1289 _fullgc_alot_dummy_array.release(Universe::vm_global());
1290 return false;
1291 }
1292
1293 // Release dummy at bottom of old generation
1294 fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1295 }
1296 return true;
1297 }
1298
1299 #endif // ASSERT