1 /*
2 * Copyright (c) 1997, 2023, 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 "cds/archiveHeapLoader.hpp"
27 #include "cds/dynamicArchive.hpp"
28 #include "cds/heapShared.hpp"
29 #include "cds/metaspaceShared.hpp"
30 #include "classfile/classLoader.hpp"
31 #include "classfile/classLoaderDataGraph.hpp"
32 #include "classfile/javaClasses.hpp"
33 #include "classfile/stringTable.hpp"
34 #include "classfile/symbolTable.hpp"
35 #include "classfile/systemDictionary.hpp"
36 #include "classfile/vmClasses.hpp"
37 #include "classfile/vmSymbols.hpp"
38 #include "code/codeBehaviours.hpp"
39 #include "code/codeCache.hpp"
40 #include "compiler/oopMap.hpp"
41 #include "gc/shared/collectedHeap.inline.hpp"
42 #include "gc/shared/gcArguments.hpp"
43 #include "gc/shared/gcConfig.hpp"
44 #include "gc/shared/gcLogPrecious.hpp"
45 #include "gc/shared/gcTraceTime.inline.hpp"
46 #include "gc/shared/oopStorageSet.hpp"
47 #include "gc/shared/plab.hpp"
48 #include "gc/shared/stringdedup/stringDedup.hpp"
49 #include "gc/shared/tlab_globals.hpp"
50 #include "logging/log.hpp"
51 #include "logging/logStream.hpp"
52 #include "memory/metadataFactory.hpp"
53 #include "memory/metaspaceClosure.hpp"
54 #include "memory/metaspaceCounters.hpp"
55 #include "memory/metaspaceUtils.hpp"
56 #include "memory/oopFactory.hpp"
57 #include "memory/resourceArea.hpp"
58 #include "memory/universe.hpp"
59 #include "oops/compressedOops.hpp"
60 #include "oops/instanceKlass.hpp"
61 #include "oops/instanceMirrorKlass.hpp"
62 #include "oops/klass.inline.hpp"
63 #include "oops/objArrayOop.inline.hpp"
64 #include "oops/oop.inline.hpp"
65 #include "oops/oopHandle.inline.hpp"
66 #include "oops/typeArrayKlass.hpp"
67 #include "prims/resolvedMethodTable.hpp"
68 #include "runtime/arguments.hpp"
69 #include "runtime/atomic.hpp"
70 #include "runtime/flags/jvmFlagLimit.hpp"
71 #include "runtime/handles.inline.hpp"
72 #include "runtime/init.hpp"
73 #include "runtime/java.hpp"
74 #include "runtime/javaThread.hpp"
75 #include "runtime/jniHandles.hpp"
76 #include "runtime/threads.hpp"
77 #include "runtime/timerTrace.hpp"
78 #include "sanitizers/leak.hpp"
79 #include "services/memoryService.hpp"
80 #include "utilities/align.hpp"
81 #include "utilities/autoRestore.hpp"
82 #include "utilities/debug.hpp"
83 #include "utilities/formatBuffer.hpp"
84 #include "utilities/macros.hpp"
85 #include "utilities/ostream.hpp"
86 #include "utilities/preserveException.hpp"
87
88 // Known objects
89 Klass* Universe::_typeArrayKlassObjs[T_LONG+1] = { nullptr /*, nullptr...*/ };
90 Klass* Universe::_objectArrayKlassObj = nullptr;
91 Klass* Universe::_fillerArrayKlassObj = nullptr;
92 OopHandle Universe::_basic_type_mirrors[T_VOID+1];
93 #if INCLUDE_CDS_JAVA_HEAP
94 int Universe::_archived_basic_type_mirror_indices[T_VOID+1];
95 #endif
96
97 OopHandle Universe::_main_thread_group;
98 OopHandle Universe::_system_thread_group;
99 OopHandle Universe::_the_empty_class_array;
100 OopHandle Universe::_the_null_string;
101 OopHandle Universe::_the_min_jint_string;
102
103 OopHandle Universe::_the_null_sentinel;
104
105 // _out_of_memory_errors is an objArray
106 enum OutOfMemoryInstance { _oom_java_heap,
107 _oom_c_heap,
108 _oom_metaspace,
109 _oom_class_metaspace,
110 _oom_array_size,
111 _oom_gc_overhead_limit,
112 _oom_realloc_objects,
113 _oom_retry,
114 _oom_count };
115
116 OopHandle Universe::_out_of_memory_errors;
117 OopHandle Universe:: _class_init_stack_overflow_error;
118 OopHandle Universe::_delayed_stack_overflow_error_message;
119 OopHandle Universe::_preallocated_out_of_memory_error_array;
120 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
121
122 // Message details for OOME objects, preallocate these objects since they could be
123 // used when throwing OOME, we should try to avoid further allocation in such case
124 OopHandle Universe::_msg_metaspace;
125 OopHandle Universe::_msg_class_metaspace;
126
127 OopHandle Universe::_null_ptr_exception_instance;
128 OopHandle Universe::_arithmetic_exception_instance;
129 OopHandle Universe::_virtual_machine_error_instance;
130
131 OopHandle Universe::_reference_pending_list;
132
133 Array<Klass*>* Universe::_the_array_interfaces_array = nullptr;
134 LatestMethodCache* Universe::_finalizer_register_cache = nullptr;
135 LatestMethodCache* Universe::_loader_addClass_cache = nullptr;
136 LatestMethodCache* Universe::_throw_illegal_access_error_cache = nullptr;
137 LatestMethodCache* Universe::_throw_no_such_method_error_cache = nullptr;
138 LatestMethodCache* Universe::_do_stack_walk_cache = nullptr;
139
140 long Universe::verify_flags = Universe::Verify_All;
141
142 Array<int>* Universe::_the_empty_int_array = nullptr;
143 Array<u2>* Universe::_the_empty_short_array = nullptr;
144 Array<Klass*>* Universe::_the_empty_klass_array = nullptr;
145 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = nullptr;
146 Array<Method*>* Universe::_the_empty_method_array = nullptr;
147
148 // These variables are guarded by FullGCALot_lock.
149 debug_only(OopHandle Universe::_fullgc_alot_dummy_array;)
150 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
151
152 // Heap
153 int Universe::_verify_count = 0;
154
155 // Oop verification (see MacroAssembler::verify_oop)
156 uintptr_t Universe::_verify_oop_mask = 0;
157 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
158
159 int Universe::_base_vtable_size = 0;
160 bool Universe::_bootstrapping = false;
161 bool Universe::_module_initialized = false;
162 bool Universe::_fully_initialized = false;
163
164 OopStorage* Universe::_vm_weak = nullptr;
165 OopStorage* Universe::_vm_global = nullptr;
166
167 CollectedHeap* Universe::_collectedHeap = nullptr;
168
169 objArrayOop Universe::the_empty_class_array () {
170 return (objArrayOop)_the_empty_class_array.resolve();
171 }
172
173 oop Universe::main_thread_group() { return _main_thread_group.resolve(); }
174 void Universe::set_main_thread_group(oop group) { _main_thread_group = OopHandle(vm_global(), group); }
175
176 oop Universe::system_thread_group() { return _system_thread_group.resolve(); }
177 void Universe::set_system_thread_group(oop group) { _system_thread_group = OopHandle(vm_global(), group); }
178
179 oop Universe::the_null_string() { return _the_null_string.resolve(); }
180 oop Universe::the_min_jint_string() { return _the_min_jint_string.resolve(); }
181
182 oop Universe::null_ptr_exception_instance() { return _null_ptr_exception_instance.resolve(); }
183 oop Universe::arithmetic_exception_instance() { return _arithmetic_exception_instance.resolve(); }
184 oop Universe::virtual_machine_error_instance() { return _virtual_machine_error_instance.resolve(); }
185
186 oop Universe::the_null_sentinel() { return _the_null_sentinel.resolve(); }
187
188 oop Universe::int_mirror() { return check_mirror(_basic_type_mirrors[T_INT].resolve()); }
189 oop Universe::float_mirror() { return check_mirror(_basic_type_mirrors[T_FLOAT].resolve()); }
190 oop Universe::double_mirror() { return check_mirror(_basic_type_mirrors[T_DOUBLE].resolve()); }
191 oop Universe::byte_mirror() { return check_mirror(_basic_type_mirrors[T_BYTE].resolve()); }
192 oop Universe::bool_mirror() { return check_mirror(_basic_type_mirrors[T_BOOLEAN].resolve()); }
193 oop Universe::char_mirror() { return check_mirror(_basic_type_mirrors[T_CHAR].resolve()); }
194 oop Universe::long_mirror() { return check_mirror(_basic_type_mirrors[T_LONG].resolve()); }
195 oop Universe::short_mirror() { return check_mirror(_basic_type_mirrors[T_SHORT].resolve()); }
196 oop Universe::void_mirror() { return check_mirror(_basic_type_mirrors[T_VOID].resolve()); }
197
198 oop Universe::java_mirror(BasicType t) {
199 assert((uint)t < T_VOID+1, "range check");
200 assert(!is_reference_type(t), "sanity");
201 return check_mirror(_basic_type_mirrors[t].resolve());
202 }
203
204 void Universe::basic_type_classes_do(KlassClosure *closure) {
205 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
206 closure->do_klass(_typeArrayKlassObjs[i]);
207 }
208 // We don't do the following because it will confuse JVMTI.
209 // _fillerArrayKlassObj is used only by GC, which doesn't need to see
210 // this klass from basic_type_classes_do().
211 //
212 // closure->do_klass(_fillerArrayKlassObj);
213 }
214
215 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
216 it->push(&_klass);
217 }
218
219 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
220 it->push(&_fillerArrayKlassObj);
221 for (int i = 0; i < T_LONG+1; i++) {
222 it->push(&_typeArrayKlassObjs[i]);
223 }
224 it->push(&_objectArrayKlassObj);
225
226 it->push(&_the_empty_int_array);
227 it->push(&_the_empty_short_array);
228 it->push(&_the_empty_klass_array);
229 it->push(&_the_empty_instance_klass_array);
230 it->push(&_the_empty_method_array);
231 it->push(&_the_array_interfaces_array);
232
233 _finalizer_register_cache->metaspace_pointers_do(it);
234 _loader_addClass_cache->metaspace_pointers_do(it);
235 _throw_illegal_access_error_cache->metaspace_pointers_do(it);
236 _throw_no_such_method_error_cache->metaspace_pointers_do(it);
237 _do_stack_walk_cache->metaspace_pointers_do(it);
238 }
239
240 #if INCLUDE_CDS_JAVA_HEAP
241 void Universe::set_archived_basic_type_mirror_index(BasicType t, int index) {
242 assert(DumpSharedSpaces, "dump-time only");
243 assert(!is_reference_type(t), "sanity");
244 _archived_basic_type_mirror_indices[t] = index;
245 }
246
247 void Universe::update_archived_basic_type_mirrors() {
248 if (ArchiveHeapLoader::is_in_use()) {
249 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
250 int index = _archived_basic_type_mirror_indices[i];
251 if (!is_reference_type((BasicType)i) && index >= 0) {
252 oop mirror_oop = HeapShared::get_root(index);
253 assert(mirror_oop != nullptr, "must be");
254 _basic_type_mirrors[i] = OopHandle(vm_global(), mirror_oop);
255 }
256 }
257 }
258 }
259 #endif
260
261 void Universe::serialize(SerializeClosure* f) {
262
263 #if INCLUDE_CDS_JAVA_HEAP
264 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
265 f->do_int(&_archived_basic_type_mirror_indices[i]);
266 // if f->reading(): We can't call HeapShared::get_root() yet, as the heap
267 // contents may need to be relocated. _basic_type_mirrors[i] will be
268 // updated later in Universe::update_archived_basic_type_mirrors().
269 }
270 #endif
271
272 f->do_ptr(&_fillerArrayKlassObj);
273 for (int i = 0; i < T_LONG+1; i++) {
274 f->do_ptr(&_typeArrayKlassObjs[i]);
275 }
276
277 f->do_ptr(&_objectArrayKlassObj);
278 f->do_ptr(&_the_array_interfaces_array);
279 f->do_ptr(&_the_empty_int_array);
280 f->do_ptr(&_the_empty_short_array);
281 f->do_ptr(&_the_empty_method_array);
282 f->do_ptr(&_the_empty_klass_array);
283 f->do_ptr(&_the_empty_instance_klass_array);
284 _finalizer_register_cache->serialize(f);
285 _loader_addClass_cache->serialize(f);
286 _throw_illegal_access_error_cache->serialize(f);
287 _throw_no_such_method_error_cache->serialize(f);
288 _do_stack_walk_cache->serialize(f);
289 }
290
291
292 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
293 if (size < alignment || size % alignment != 0) {
294 vm_exit_during_initialization(
295 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
296 }
297 }
298
299 void initialize_basic_type_klass(Klass* k, TRAPS) {
300 Klass* ok = vmClasses::Object_klass();
301 #if INCLUDE_CDS
302 if (UseSharedSpaces) {
303 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
304 assert(k->super() == ok, "u3");
305 if (k->is_instance_klass()) {
306 InstanceKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), nullptr, CHECK);
307 } else {
308 ArrayKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), CHECK);
309 }
310 } else
311 #endif
312 {
313 k->initialize_supers(ok, nullptr, CHECK);
314 }
315 k->append_to_sibling_list();
316 }
317
318 void Universe::genesis(TRAPS) {
319 ResourceMark rm(THREAD);
320 HandleMark hm(THREAD);
321
322 // Explicit null checks are needed if these offsets are not smaller than the page size
323 assert(oopDesc::klass_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()),
324 "Klass offset is expected to be less than the page size");
325 assert(arrayOopDesc::length_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()),
326 "Array length offset is expected to be less than the page size");
327
328 { AutoModifyRestore<bool> temporarily(_bootstrapping, true);
329
330 java_lang_Class::allocate_fixup_lists();
331
332 // determine base vtable size; without that we cannot create the array klasses
333 compute_base_vtable_size();
334
335 if (!UseSharedSpaces) {
336 // Initialization of the fillerArrayKlass must come before regular
337 // int-TypeArrayKlass so that the int-Array mirror points to the
338 // int-TypeArrayKlass.
339 _fillerArrayKlassObj = TypeArrayKlass::create_klass(T_INT, "Ljdk/internal/vm/FillerArray;", CHECK);
340 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
341 _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK);
342 }
343
344 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
345
346 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, nullptr, CHECK);
347 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
348 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
349 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
350 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
351 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK);
352 }
353
354 vmSymbols::initialize();
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 vmClasses::Cloneable_klass(), "u3");
370 assert(_the_array_interfaces_array->at(1) ==
371 vmClasses::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, vmClasses::Cloneable_klass());
377 _the_array_interfaces_array->at_put(1, vmClasses::Serializable_klass());
378 }
379
380 initialize_basic_type_klass(_fillerArrayKlassObj, CHECK);
381
382 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
383 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
384 initialize_basic_type_klass(floatArrayKlassObj(), CHECK);
385 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
386 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
387 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
388 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
389 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
390
391 assert(_fillerArrayKlassObj != intArrayKlassObj(),
392 "Internal filler array klass should be different to int array Klass");
393 } // end of core bootstrapping
394
395 {
396 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
397 _the_null_sentinel = OopHandle(vm_global(), tns());
398 }
399
400 // Create a handle for reference_pending_list
401 _reference_pending_list = OopHandle(vm_global(), nullptr);
402
403 // Maybe this could be lifted up now that object array can be initialized
404 // during the bootstrapping.
405
406 // OLD
407 // Initialize _objectArrayKlass after core bootstraping to make
408 // sure the super class is set up properly for _objectArrayKlass.
409 // ---
410 // NEW
411 // Since some of the old system object arrays have been converted to
412 // ordinary object arrays, _objectArrayKlass will be loaded when
413 // SystemDictionary::initialize(CHECK); is run. See the extra check
414 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
415 _objectArrayKlassObj = InstanceKlass::
416 cast(vmClasses::Object_klass())->array_klass(1, CHECK);
417 // OLD
418 // Add the class to the class hierarchy manually to make sure that
419 // its vtable is initialized after core bootstrapping is completed.
420 // ---
421 // New
422 // Have already been initialized.
423 _objectArrayKlassObj->append_to_sibling_list();
424
425 #ifdef ASSERT
426 if (FullGCALot) {
427 // Allocate an array of dummy objects.
428 // We'd like these to be at the bottom of the old generation,
429 // so that when we free one and then collect,
430 // (almost) the whole heap moves
431 // and we find out if we actually update all the oops correctly.
432 // But we can't allocate directly in the old generation,
433 // so we allocate wherever, and hope that the first collection
434 // moves these objects to the bottom of the old generation.
435 int size = FullGCALotDummies * 2;
436
437 objArrayOop naked_array = oopFactory::new_objArray(vmClasses::Object_klass(), size, CHECK);
438 objArrayHandle dummy_array(THREAD, naked_array);
439 int i = 0;
440 while (i < size) {
441 // Allocate dummy in old generation
442 oop dummy = vmClasses::Object_klass()->allocate_instance(CHECK);
443 dummy_array->obj_at_put(i++, dummy);
444 }
445 {
446 // Only modify the global variable inside the mutex.
447 // If we had a race to here, the other dummy_array instances
448 // and their elements just get dropped on the floor, which is fine.
449 MutexLocker ml(THREAD, FullGCALot_lock);
450 if (_fullgc_alot_dummy_array.is_empty()) {
451 _fullgc_alot_dummy_array = OopHandle(vm_global(), dummy_array());
452 }
453 }
454 assert(i == ((objArrayOop)_fullgc_alot_dummy_array.resolve())->length(), "just checking");
455 }
456 #endif
457 }
458
459 void Universe::initialize_basic_type_mirrors(TRAPS) {
460 #if INCLUDE_CDS_JAVA_HEAP
461 if (UseSharedSpaces &&
462 ArchiveHeapLoader::is_in_use() &&
463 _basic_type_mirrors[T_INT].resolve() != nullptr) {
464 assert(ArchiveHeapLoader::can_use(), "Sanity");
465
466 // check that all basic type mirrors are mapped also
467 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
468 if (!is_reference_type((BasicType)i)) {
469 oop m = _basic_type_mirrors[i].resolve();
470 assert(m != nullptr, "archived mirrors should not be null");
471 }
472 }
473 } else
474 // _basic_type_mirrors[T_INT], etc, are null if archived heap is not mapped.
475 #endif
476 {
477 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
478 BasicType bt = (BasicType)i;
479 if (!is_reference_type(bt)) {
480 oop m = java_lang_Class::create_basic_type_mirror(type2name(bt), bt, CHECK);
481 _basic_type_mirrors[i] = OopHandle(vm_global(), m);
482 }
483 CDS_JAVA_HEAP_ONLY(_archived_basic_type_mirror_indices[i] = -1);
484 }
485 }
486 if (DumpSharedSpaces) {
487 HeapShared::init_scratch_objects(CHECK);
488 }
489 }
490
491 void Universe::fixup_mirrors(TRAPS) {
492 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
493 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
494 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
495 // that the number of objects allocated at this point is very small.
496 assert(vmClasses::Class_klass_loaded(), "java.lang.Class should be loaded");
497 HandleMark hm(THREAD);
498
499 if (!UseSharedSpaces) {
500 // Cache the start of the static fields
501 InstanceMirrorKlass::init_offset_of_static_fields();
502 }
503
504 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
505 int list_length = list->length();
506 for (int i = 0; i < list_length; i++) {
507 Klass* k = list->at(i);
508 assert(k->is_klass(), "List should only hold classes");
509 java_lang_Class::fixup_mirror(k, CATCH);
510 }
511 delete java_lang_Class::fixup_mirror_list();
512 java_lang_Class::set_fixup_mirror_list(nullptr);
513 }
514
515 #define assert_pll_locked(test) \
516 assert(Heap_lock->test(), "Reference pending list access requires lock")
517
518 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
519
520 oop Universe::reference_pending_list() {
521 if (Thread::current()->is_VM_thread()) {
522 assert_pll_locked(is_locked);
523 } else {
524 assert_pll_ownership();
525 }
526 return _reference_pending_list.resolve();
527 }
528
529 void Universe::clear_reference_pending_list() {
530 assert_pll_ownership();
531 _reference_pending_list.replace(nullptr);
532 }
533
534 bool Universe::has_reference_pending_list() {
535 assert_pll_ownership();
536 return _reference_pending_list.peek() != nullptr;
537 }
538
539 oop Universe::swap_reference_pending_list(oop list) {
540 assert_pll_locked(is_locked);
541 return _reference_pending_list.xchg(list);
542 }
543
544 #undef assert_pll_locked
545 #undef assert_pll_ownership
546
547 static void reinitialize_vtables() {
548 // The vtables are initialized by starting at java.lang.Object and
549 // initializing through the subclass links, so that the super
550 // classes are always initialized first.
551 for (ClassHierarchyIterator iter(vmClasses::Object_klass()); !iter.done(); iter.next()) {
552 Klass* sub = iter.klass();
553 sub->vtable().initialize_vtable();
554 }
555 }
556
557 static void reinitialize_itables() {
558
559 class ReinitTableClosure : public KlassClosure {
560 public:
561 void do_klass(Klass* k) {
562 if (k->is_instance_klass()) {
563 InstanceKlass::cast(k)->itable().initialize_itable();
564 }
565 }
566 };
567
568 MutexLocker mcld(ClassLoaderDataGraph_lock);
569 ReinitTableClosure cl;
570 ClassLoaderDataGraph::classes_do(&cl);
571 }
572
573 bool Universe::on_page_boundary(void* addr) {
574 return is_aligned(addr, os::vm_page_size());
575 }
576
577 // the array of preallocated errors with backtraces
578 objArrayOop Universe::preallocated_out_of_memory_errors() {
579 return (objArrayOop)_preallocated_out_of_memory_error_array.resolve();
580 }
581
582 objArrayOop Universe::out_of_memory_errors() { return (objArrayOop)_out_of_memory_errors.resolve(); }
583
584 oop Universe::out_of_memory_error_java_heap() {
585 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_java_heap));
586 }
587
588 oop Universe::out_of_memory_error_c_heap() {
589 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_c_heap));
590 }
591
592 oop Universe::out_of_memory_error_metaspace() {
593 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_metaspace));
594 }
595
596 oop Universe::out_of_memory_error_class_metaspace() {
597 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_class_metaspace));
598 }
599
600 oop Universe::out_of_memory_error_array_size() {
601 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_array_size));
602 }
603
604 oop Universe::out_of_memory_error_gc_overhead_limit() {
605 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_gc_overhead_limit));
606 }
607
608 oop Universe::out_of_memory_error_realloc_objects() {
609 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_realloc_objects));
610 }
611
612 // Throw default _out_of_memory_error_retry object as it will never propagate out of the VM
613 oop Universe::out_of_memory_error_retry() { return out_of_memory_errors()->obj_at(_oom_retry); }
614
615 oop Universe::class_init_out_of_memory_error() { return out_of_memory_errors()->obj_at(_oom_java_heap); }
616 oop Universe::class_init_stack_overflow_error() { return _class_init_stack_overflow_error.resolve(); }
617 oop Universe::delayed_stack_overflow_error_message() { return _delayed_stack_overflow_error_message.resolve(); }
618
619
620 bool Universe::should_fill_in_stack_trace(Handle throwable) {
621 // never attempt to fill in the stack trace of preallocated errors that do not have
622 // backtrace. These errors are kept alive forever and may be "re-used" when all
623 // preallocated errors with backtrace have been consumed. Also need to avoid
624 // a potential loop which could happen if an out of memory occurs when attempting
625 // to allocate the backtrace.
626 objArrayOop preallocated_oom = out_of_memory_errors();
627 for (int i = 0; i < _oom_count; i++) {
628 if (throwable() == preallocated_oom->obj_at(i)) {
629 return false;
630 }
631 }
632 return true;
633 }
634
635
636 oop Universe::gen_out_of_memory_error(oop default_err) {
637 // generate an out of memory error:
638 // - if there is a preallocated error and stack traces are available
639 // (j.l.Throwable is initialized), then return the preallocated
640 // error with a filled in stack trace, and with the message
641 // provided by the default error.
642 // - otherwise, return the default error, without a stack trace.
643 int next;
644 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
645 vmClasses::Throwable_klass()->is_initialized()) {
646 next = (int)Atomic::add(&_preallocated_out_of_memory_error_avail_count, -1);
647 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
648 } else {
649 next = -1;
650 }
651 if (next < 0) {
652 // all preallocated errors have been used.
653 // return default
654 return default_err;
655 } else {
656 JavaThread* current = JavaThread::current();
657 Handle default_err_h(current, default_err);
658 // get the error object at the slot and set set it to null so that the
659 // array isn't keeping it alive anymore.
660 Handle exc(current, preallocated_out_of_memory_errors()->obj_at(next));
661 assert(exc() != nullptr, "slot has been used already");
662 preallocated_out_of_memory_errors()->obj_at_put(next, nullptr);
663
664 // use the message from the default error
665 oop msg = java_lang_Throwable::message(default_err_h());
666 assert(msg != nullptr, "no message");
667 java_lang_Throwable::set_message(exc(), msg);
668
669 // populate the stack trace and return it.
670 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
671 return exc();
672 }
673 }
674
675 bool Universe::is_out_of_memory_error_metaspace(oop ex_obj) {
676 return java_lang_Throwable::message(ex_obj) == _msg_metaspace.resolve();
677 }
678
679 bool Universe::is_out_of_memory_error_class_metaspace(oop ex_obj) {
680 return java_lang_Throwable::message(ex_obj) == _msg_class_metaspace.resolve();
681 }
682
683 // Setup preallocated OutOfMemoryError errors
684 void Universe::create_preallocated_out_of_memory_errors(TRAPS) {
685 InstanceKlass* ik = vmClasses::OutOfMemoryError_klass();
686 objArrayOop oa = oopFactory::new_objArray(ik, _oom_count, CHECK);
687 objArrayHandle oom_array(THREAD, oa);
688
689 for (int i = 0; i < _oom_count; i++) {
690 oop oom_obj = ik->allocate_instance(CHECK);
691 oom_array->obj_at_put(i, oom_obj);
692 }
693 _out_of_memory_errors = OopHandle(vm_global(), oom_array());
694
695 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK);
696 java_lang_Throwable::set_message(oom_array->obj_at(_oom_java_heap), msg());
697
698 msg = java_lang_String::create_from_str("C heap space", CHECK);
699 java_lang_Throwable::set_message(oom_array->obj_at(_oom_c_heap), msg());
700
701 msg = java_lang_String::create_from_str("Metaspace", CHECK);
702 _msg_metaspace = OopHandle(vm_global(), msg());
703 java_lang_Throwable::set_message(oom_array->obj_at(_oom_metaspace), msg());
704
705 msg = java_lang_String::create_from_str("Compressed class space", CHECK);
706 _msg_class_metaspace = OopHandle(vm_global(), msg());
707 java_lang_Throwable::set_message(oom_array->obj_at(_oom_class_metaspace), msg());
708
709 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK);
710 java_lang_Throwable::set_message(oom_array->obj_at(_oom_array_size), msg());
711
712 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK);
713 java_lang_Throwable::set_message(oom_array->obj_at(_oom_gc_overhead_limit), msg());
714
715 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK);
716 java_lang_Throwable::set_message(oom_array->obj_at(_oom_realloc_objects), msg());
717
718 msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK);
719 java_lang_Throwable::set_message(oom_array->obj_at(_oom_retry), msg());
720
721 // Setup the array of errors that have preallocated backtrace
722 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
723 objArrayOop instance = oopFactory::new_objArray(ik, len, CHECK);
724 _preallocated_out_of_memory_error_array = OopHandle(vm_global(), instance);
725 objArrayHandle preallocated_oom_array(THREAD, instance);
726
727 for (int i=0; i<len; i++) {
728 oop err = ik->allocate_instance(CHECK);
729 Handle err_h(THREAD, err);
730 java_lang_Throwable::allocate_backtrace(err_h, CHECK);
731 preallocated_oom_array->obj_at_put(i, err_h());
732 }
733 _preallocated_out_of_memory_error_avail_count = (jint)len;
734 }
735
736 intptr_t Universe::_non_oop_bits = 0;
737
738 void* Universe::non_oop_word() {
739 // Neither the high bits nor the low bits of this value is allowed
740 // to look like (respectively) the high or low bits of a real oop.
741 //
742 // High and low are CPU-specific notions, but low always includes
743 // the low-order bit. Since oops are always aligned at least mod 4,
744 // setting the low-order bit will ensure that the low half of the
745 // word will never look like that of a real oop.
746 //
747 // Using the OS-supplied non-memory-address word (usually 0 or -1)
748 // will take care of the high bits, however many there are.
749
750 if (_non_oop_bits == 0) {
751 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
752 }
753
754 return (void*)_non_oop_bits;
755 }
756
757 bool Universe::contains_non_oop_word(void* p) {
758 return *(void**)p == non_oop_word();
759 }
760
761 static void initialize_global_behaviours() {
762 DefaultICProtectionBehaviour* protection_behavior = new DefaultICProtectionBehaviour();
763 // Ignore leak of DefaultICProtectionBehaviour. It is overriden by some GC implementations and the
764 // pointer is leaked once.
765 LSAN_IGNORE_OBJECT(protection_behavior);
766 CompiledICProtectionBehaviour::set_current(protection_behavior);
767 }
768
769 jint universe_init() {
770 assert(!Universe::_fully_initialized, "called after initialize_vtables");
771 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
772 "LogHeapWordSize is incorrect.");
773 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
774 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
775 "oop size is not not a multiple of HeapWord size");
776
777 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
778
779 initialize_global_behaviours();
780
781 GCLogPrecious::initialize();
782
783 #ifdef _LP64
784 MetaspaceShared::adjust_heap_sizes_for_dumping();
785 #endif // _LP64
786
787 GCConfig::arguments()->initialize_heap_sizes();
788
789 jint status = Universe::initialize_heap();
790 if (status != JNI_OK) {
791 return status;
792 }
793
794 Universe::initialize_tlab();
795
796 Metaspace::global_initialize();
797
798 // Initialize performance counters for metaspaces
799 MetaspaceCounters::initialize_performance_counters();
800
801 // Checks 'AfterMemoryInit' constraints.
802 if (!JVMFlagLimit::check_all_constraints(JVMFlagConstraintPhase::AfterMemoryInit)) {
803 return JNI_EINVAL;
804 }
805
806 // Create memory for metadata. Must be after initializing heap for
807 // DumpSharedSpaces.
808 ClassLoaderData::init_null_class_loader_data();
809
810 // We have a heap so create the Method* caches before
811 // Metaspace::initialize_shared_spaces() tries to populate them.
812 Universe::_finalizer_register_cache = new LatestMethodCache();
813 Universe::_loader_addClass_cache = new LatestMethodCache();
814 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
815 Universe::_throw_no_such_method_error_cache = new LatestMethodCache();
816 Universe::_do_stack_walk_cache = new LatestMethodCache();
817
818 #if INCLUDE_CDS
819 DynamicArchive::check_for_dynamic_dump();
820 if (UseSharedSpaces) {
821 // Read the data structures supporting the shared spaces (shared
822 // system dictionary, symbol table, etc.)
823 MetaspaceShared::initialize_shared_spaces();
824 }
825 if (Arguments::is_dumping_archive()) {
826 MetaspaceShared::prepare_for_dumping();
827 }
828 #endif
829
830 SymbolTable::create_table();
831 StringTable::create_table();
832
833 if (strlen(VerifySubSet) > 0) {
834 Universe::initialize_verify_flags();
835 }
836
837 ResolvedMethodTable::create_table();
838
839 return JNI_OK;
840 }
841
842 jint Universe::initialize_heap() {
843 assert(_collectedHeap == nullptr, "Heap already created");
844 _collectedHeap = GCConfig::arguments()->create_heap();
845
846 log_info(gc)("Using %s", _collectedHeap->name());
847 return _collectedHeap->initialize();
848 }
849
850 void Universe::initialize_tlab() {
851 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
852 PLAB::startup_initialization();
853 if (UseTLAB) {
854 ThreadLocalAllocBuffer::startup_initialization();
855 }
856 }
857
858 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
859
860 assert(alignment <= Arguments::conservative_max_heap_alignment(),
861 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
862 alignment, Arguments::conservative_max_heap_alignment());
863
864 size_t total_reserved = align_up(heap_size, alignment);
865 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
866 "heap size is too big for compressed oops");
867
868 size_t page_size = os::vm_page_size();
869 if (UseLargePages && is_aligned(alignment, os::large_page_size())) {
870 page_size = os::large_page_size();
871 } else {
872 // Parallel is the only collector that might opt out of using large pages
873 // for the heap.
874 assert(!UseLargePages || UseParallelGC , "Wrong alignment to use large pages");
875 }
876
877 // Now create the space.
878 ReservedHeapSpace total_rs(total_reserved, alignment, page_size, AllocateHeapAt);
879
880 if (total_rs.is_reserved()) {
881 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
882 "must be exactly of required size and alignment");
883 // We are good.
884
885 if (AllocateHeapAt != nullptr) {
886 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
887 }
888
889 if (UseCompressedOops) {
890 CompressedOops::initialize(total_rs);
891 }
892
893 Universe::calculate_verify_data((HeapWord*)total_rs.base(), (HeapWord*)total_rs.end());
894
895 return total_rs;
896 }
897
898 vm_exit_during_initialization(
899 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
900 total_reserved/K));
901
902 // satisfy compiler
903 ShouldNotReachHere();
904 return ReservedHeapSpace(0, 0, os::vm_page_size());
905 }
906
907 OopStorage* Universe::vm_weak() {
908 return Universe::_vm_weak;
909 }
910
911 OopStorage* Universe::vm_global() {
912 return Universe::_vm_global;
913 }
914
915 void Universe::oopstorage_init() {
916 Universe::_vm_global = OopStorageSet::create_strong("VM Global", mtInternal);
917 Universe::_vm_weak = OopStorageSet::create_weak("VM Weak", mtInternal);
918 }
919
920 void universe_oopstorage_init() {
921 Universe::oopstorage_init();
922 }
923
924 void initialize_known_method(LatestMethodCache* method_cache,
925 InstanceKlass* ik,
926 const char* method,
927 Symbol* signature,
928 bool is_static, TRAPS)
929 {
930 TempNewSymbol name = SymbolTable::new_symbol(method);
931 Method* m = nullptr;
932 // The klass must be linked before looking up the method.
933 if (!ik->link_class_or_fail(THREAD) ||
934 ((m = ik->find_method(name, signature)) == nullptr) ||
935 is_static != m->is_static()) {
936 ResourceMark rm(THREAD);
937 // NoSuchMethodException doesn't actually work because it tries to run the
938 // <init> function before java_lang_Class is linked. Print error and exit.
939 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
940 ik->name()->as_C_string(), method));
941 }
942 method_cache->init(ik, m);
943 }
944
945 void Universe::initialize_known_methods(TRAPS) {
946 // Set up static method for registering finalizers
947 initialize_known_method(_finalizer_register_cache,
948 vmClasses::Finalizer_klass(),
949 "register",
950 vmSymbols::object_void_signature(), true, CHECK);
951
952 initialize_known_method(_throw_illegal_access_error_cache,
953 vmClasses::internal_Unsafe_klass(),
954 "throwIllegalAccessError",
955 vmSymbols::void_method_signature(), true, CHECK);
956
957 initialize_known_method(_throw_no_such_method_error_cache,
958 vmClasses::internal_Unsafe_klass(),
959 "throwNoSuchMethodError",
960 vmSymbols::void_method_signature(), true, CHECK);
961
962 // Set up method for registering loaded classes in class loader vector
963 initialize_known_method(_loader_addClass_cache,
964 vmClasses::ClassLoader_klass(),
965 "addClass",
966 vmSymbols::class_void_signature(), false, CHECK);
967
968 // Set up method for stack walking
969 initialize_known_method(_do_stack_walk_cache,
970 vmClasses::AbstractStackWalker_klass(),
971 "doStackWalk",
972 vmSymbols::doStackWalk_signature(), false, CHECK);
973 }
974
975 void universe2_init() {
976 EXCEPTION_MARK;
977 Universe::genesis(CATCH);
978 }
979
980 // Set after initialization of the module runtime, call_initModuleRuntime
981 void universe_post_module_init() {
982 Universe::_module_initialized = true;
983 }
984
985 bool universe_post_init() {
986 assert(!is_init_completed(), "Error: initialization not yet completed!");
987 Universe::_fully_initialized = true;
988 EXCEPTION_MARK;
989 if (!UseSharedSpaces) {
990 reinitialize_vtables();
991 reinitialize_itables();
992 }
993
994 HandleMark hm(THREAD);
995 // Setup preallocated empty java.lang.Class array for Method reflection.
996
997 objArrayOop the_empty_class_array = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_false);
998 Universe::_the_empty_class_array = OopHandle(Universe::vm_global(), the_empty_class_array);
999
1000 // Setup preallocated OutOfMemoryError errors
1001 Universe::create_preallocated_out_of_memory_errors(CHECK_false);
1002
1003 oop instance;
1004 // Setup preallocated cause message for delayed StackOverflowError
1005 if (StackReservedPages > 0) {
1006 instance = java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
1007 Universe::_delayed_stack_overflow_error_message = OopHandle(Universe::vm_global(), instance);
1008 }
1009
1010 // Setup preallocated NullPointerException
1011 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1012 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
1013 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1014 Universe::_null_ptr_exception_instance = OopHandle(Universe::vm_global(), instance);
1015
1016 // Setup preallocated ArithmeticException
1017 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1018 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
1019 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1020 Universe::_arithmetic_exception_instance = OopHandle(Universe::vm_global(), instance);
1021
1022 // Virtual Machine Error for when we get into a situation we can't resolve
1023 k = vmClasses::VirtualMachineError_klass();
1024 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1025 if (!linked) {
1026 tty->print_cr("Unable to link/verify VirtualMachineError class");
1027 return false; // initialization failed
1028 }
1029 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1030 Universe::_virtual_machine_error_instance = OopHandle(Universe::vm_global(), instance);
1031
1032 Handle msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1033 java_lang_Throwable::set_message(Universe::arithmetic_exception_instance(), msg());
1034
1035 // Setup preallocated StackOverflowError for use with class initialization failure
1036 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_StackOverflowError(), true, CHECK_false);
1037 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1038 Universe::_class_init_stack_overflow_error = OopHandle(Universe::vm_global(), instance);
1039
1040 Universe::initialize_known_methods(CHECK_false);
1041
1042 // This needs to be done before the first scavenge/gc, since
1043 // it's an input to soft ref clearing policy.
1044 {
1045 MutexLocker x(THREAD, Heap_lock);
1046 Universe::heap()->update_capacity_and_used_at_gc();
1047 }
1048
1049 // ("weak") refs processing infrastructure initialization
1050 Universe::heap()->post_initialize();
1051
1052 MemoryService::add_metaspace_memory_pools();
1053
1054 MemoryService::set_universe_heap(Universe::heap());
1055 #if INCLUDE_CDS
1056 MetaspaceShared::post_initialize(CHECK_false);
1057 #endif
1058 return true;
1059 }
1060
1061
1062 void Universe::compute_base_vtable_size() {
1063 _base_vtable_size = ClassLoader::compute_Object_vtable();
1064 }
1065
1066 void Universe::print_on(outputStream* st) {
1067 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1068 st->print_cr("Heap");
1069 heap()->print_on(st);
1070 }
1071
1072 void Universe::print_heap_at_SIGBREAK() {
1073 if (PrintHeapAtSIGBREAK) {
1074 print_on(tty);
1075 tty->cr();
1076 tty->flush();
1077 }
1078 }
1079
1080 void Universe::initialize_verify_flags() {
1081 verify_flags = 0;
1082 const char delimiter[] = " ,";
1083
1084 size_t length = strlen(VerifySubSet);
1085 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1086 strncpy(subset_list, VerifySubSet, length + 1);
1087 char* save_ptr;
1088
1089 char* token = strtok_r(subset_list, delimiter, &save_ptr);
1090 while (token != nullptr) {
1091 if (strcmp(token, "threads") == 0) {
1092 verify_flags |= Verify_Threads;
1093 } else if (strcmp(token, "heap") == 0) {
1094 verify_flags |= Verify_Heap;
1095 } else if (strcmp(token, "symbol_table") == 0) {
1096 verify_flags |= Verify_SymbolTable;
1097 } else if (strcmp(token, "string_table") == 0) {
1098 verify_flags |= Verify_StringTable;
1099 } else if (strcmp(token, "codecache") == 0) {
1100 verify_flags |= Verify_CodeCache;
1101 } else if (strcmp(token, "dictionary") == 0) {
1102 verify_flags |= Verify_SystemDictionary;
1103 } else if (strcmp(token, "classloader_data_graph") == 0) {
1104 verify_flags |= Verify_ClassLoaderDataGraph;
1105 } else if (strcmp(token, "metaspace") == 0) {
1106 verify_flags |= Verify_MetaspaceUtils;
1107 } else if (strcmp(token, "jni_handles") == 0) {
1108 verify_flags |= Verify_JNIHandles;
1109 } else if (strcmp(token, "codecache_oops") == 0) {
1110 verify_flags |= Verify_CodeCacheOops;
1111 } else if (strcmp(token, "resolved_method_table") == 0) {
1112 verify_flags |= Verify_ResolvedMethodTable;
1113 } else if (strcmp(token, "stringdedup") == 0) {
1114 verify_flags |= Verify_StringDedup;
1115 } else {
1116 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1117 }
1118 token = strtok_r(nullptr, delimiter, &save_ptr);
1119 }
1120 FREE_C_HEAP_ARRAY(char, subset_list);
1121 }
1122
1123 bool Universe::should_verify_subset(uint subset) {
1124 if (verify_flags & subset) {
1125 return true;
1126 }
1127 return false;
1128 }
1129
1130 void Universe::verify(VerifyOption option, const char* prefix) {
1131 COMPILER2_PRESENT(
1132 assert(!DerivedPointerTable::is_active(),
1133 "DPT should not be active during verification "
1134 "(of thread stacks below)");
1135 )
1136
1137 Thread* thread = Thread::current();
1138 ResourceMark rm(thread);
1139 HandleMark hm(thread); // Handles created during verification can be zapped
1140 _verify_count++;
1141
1142 FormatBuffer<> title("Verifying %s", prefix);
1143 GCTraceTime(Info, gc, verify) tm(title.buffer());
1144 if (should_verify_subset(Verify_Threads)) {
1145 log_debug(gc, verify)("Threads");
1146 Threads::verify();
1147 }
1148 if (should_verify_subset(Verify_Heap)) {
1149 log_debug(gc, verify)("Heap");
1150 heap()->verify(option);
1151 }
1152 if (should_verify_subset(Verify_SymbolTable)) {
1153 log_debug(gc, verify)("SymbolTable");
1154 SymbolTable::verify();
1155 }
1156 if (should_verify_subset(Verify_StringTable)) {
1157 log_debug(gc, verify)("StringTable");
1158 StringTable::verify();
1159 }
1160 if (should_verify_subset(Verify_CodeCache)) {
1161 log_debug(gc, verify)("CodeCache");
1162 CodeCache::verify();
1163 }
1164 if (should_verify_subset(Verify_SystemDictionary)) {
1165 log_debug(gc, verify)("SystemDictionary");
1166 SystemDictionary::verify();
1167 }
1168 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1169 log_debug(gc, verify)("ClassLoaderDataGraph");
1170 ClassLoaderDataGraph::verify();
1171 }
1172 if (should_verify_subset(Verify_MetaspaceUtils)) {
1173 log_debug(gc, verify)("MetaspaceUtils");
1174 DEBUG_ONLY(MetaspaceUtils::verify();)
1175 }
1176 if (should_verify_subset(Verify_JNIHandles)) {
1177 log_debug(gc, verify)("JNIHandles");
1178 JNIHandles::verify();
1179 }
1180 if (should_verify_subset(Verify_CodeCacheOops)) {
1181 log_debug(gc, verify)("CodeCache Oops");
1182 CodeCache::verify_oops();
1183 }
1184 if (should_verify_subset(Verify_ResolvedMethodTable)) {
1185 log_debug(gc, verify)("ResolvedMethodTable Oops");
1186 ResolvedMethodTable::verify();
1187 }
1188 if (should_verify_subset(Verify_StringDedup)) {
1189 log_debug(gc, verify)("String Deduplication");
1190 StringDedup::verify();
1191 }
1192 }
1193
1194
1195 #ifndef PRODUCT
1196 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1197 assert(low_boundary < high_boundary, "bad interval");
1198
1199 // decide which low-order bits we require to be clear:
1200 size_t alignSize = MinObjAlignmentInBytes;
1201 size_t min_object_size = CollectedHeap::min_fill_size();
1202
1203 // make an inclusive limit:
1204 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1205 uintptr_t min = (uintptr_t)low_boundary;
1206 assert(min < max, "bad interval");
1207 uintptr_t diff = max ^ min;
1208
1209 // throw away enough low-order bits to make the diff vanish
1210 uintptr_t mask = (uintptr_t)(-1);
1211 while ((mask & diff) != 0)
1212 mask <<= 1;
1213 uintptr_t bits = (min & mask);
1214 assert(bits == (max & mask), "correct mask");
1215 // check an intermediate value between min and max, just to make sure:
1216 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1217
1218 // require address alignment, too:
1219 mask |= (alignSize - 1);
1220
1221 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1222 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1223 }
1224 _verify_oop_mask = mask;
1225 _verify_oop_bits = bits;
1226 }
1227
1228 void Universe::set_verify_data(uintptr_t mask, uintptr_t bits) {
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 initialization should have already set up _klass
1263 assert(_klass != nullptr, "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() == nullptr) return nullptr;
1274 InstanceKlass* ik = InstanceKlass::cast(klass());
1275 Method* m = ik->method_with_idnum(method_idnum());
1276 assert(m != nullptr, "sanity check");
1277 return m;
1278 }
1279
1280 void LatestMethodCache::serialize(SerializeClosure* f) {
1281 f->do_ptr(&_klass);
1282 }
1283
1284 #ifdef ASSERT
1285 // Release dummy object(s) at bottom of heap
1286 bool Universe::release_fullgc_alot_dummy() {
1287 MutexLocker ml(FullGCALot_lock);
1288 objArrayOop fullgc_alot_dummy_array = (objArrayOop)_fullgc_alot_dummy_array.resolve();
1289 if (fullgc_alot_dummy_array != nullptr) {
1290 if (_fullgc_alot_dummy_next >= fullgc_alot_dummy_array->length()) {
1291 // No more dummies to release, release entire array instead
1292 _fullgc_alot_dummy_array.release(Universe::vm_global());
1293 _fullgc_alot_dummy_array = OopHandle(); // null out OopStorage pointer.
1294 return false;
1295 }
1296
1297 // Release dummy at bottom of old generation
1298 fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, nullptr);
1299 }
1300 return true;
1301 }
1302
1303 bool Universe::is_gc_active() {
1304 return heap()->is_gc_active();
1305 }
1306
1307 bool Universe::is_in_heap(const void* p) {
1308 return heap()->is_in(p);
1309 }
1310
1311 #endif // ASSERT