1 /*
2 * Copyright (c) 1997, 2025, 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 "cds/archiveHeapLoader.hpp"
26 #include "cds/cdsConfig.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/classLoaderDataShared.hpp"
33 #include "classfile/javaClasses.hpp"
34 #include "classfile/stringTable.hpp"
35 #include "classfile/symbolTable.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/vmClasses.hpp"
38 #include "classfile/vmSymbols.hpp"
39 #include "code/codeBehaviours.hpp"
40 #include "code/codeCache.hpp"
41 #include "compiler/oopMap.hpp"
42 #include "gc/shared/collectedHeap.inline.hpp"
43 #include "gc/shared/gcArguments.hpp"
44 #include "gc/shared/gcConfig.hpp"
45 #include "gc/shared/gcLogPrecious.hpp"
46 #include "gc/shared/gcTraceTime.inline.hpp"
47 #include "gc/shared/oopStorageSet.hpp"
48 #include "gc/shared/plab.hpp"
49 #include "gc/shared/stringdedup/stringDedup.hpp"
50 #include "gc/shared/tlab_globals.hpp"
51 #include "logging/log.hpp"
52 #include "logging/logStream.hpp"
53 #include "memory/memoryReserver.hpp"
54 #include "memory/metadataFactory.hpp"
55 #include "memory/metaspaceClosure.hpp"
56 #include "memory/metaspaceCounters.hpp"
57 #include "memory/metaspaceUtils.hpp"
58 #include "memory/oopFactory.hpp"
59 #include "memory/resourceArea.hpp"
60 #include "memory/universe.hpp"
61 #include "oops/compressedOops.hpp"
62 #include "oops/instanceKlass.hpp"
63 #include "oops/instanceMirrorKlass.hpp"
64 #include "oops/jmethodIDTable.hpp"
65 #include "oops/klass.inline.hpp"
66 #include "oops/objArrayOop.inline.hpp"
67 #include "oops/objLayout.hpp"
68 #include "oops/oop.inline.hpp"
69 #include "oops/oopHandle.inline.hpp"
70 #include "oops/typeArrayKlass.hpp"
71 #include "prims/resolvedMethodTable.hpp"
72 #include "runtime/arguments.hpp"
73 #include "runtime/atomic.hpp"
74 #include "runtime/cpuTimeCounters.hpp"
75 #include "runtime/flags/jvmFlagLimit.hpp"
76 #include "runtime/handles.inline.hpp"
77 #include "runtime/init.hpp"
78 #include "runtime/java.hpp"
79 #include "runtime/javaThread.hpp"
80 #include "runtime/jniHandles.hpp"
81 #include "runtime/threads.hpp"
82 #include "runtime/timerTrace.hpp"
83 #include "sanitizers/leak.hpp"
84 #include "services/memoryService.hpp"
85 #include "utilities/align.hpp"
86 #include "utilities/autoRestore.hpp"
87 #include "utilities/debug.hpp"
88 #include "utilities/formatBuffer.hpp"
89 #include "utilities/macros.hpp"
90 #include "utilities/ostream.hpp"
91 #include "utilities/preserveException.hpp"
92
93 // A helper class for caching a Method* when the user of the cache
94 // only cares about the latest version of the Method*. This cache safely
95 // interacts with the RedefineClasses API.
96 class LatestMethodCache {
97 // We save the InstanceKlass* and the idnum of Method* in order to get
98 // the current Method*.
99 InstanceKlass* _klass;
100 int _method_idnum;
101
102 public:
103 LatestMethodCache() { _klass = nullptr; _method_idnum = -1; }
104
105 void init(JavaThread* current, InstanceKlass* ik, const char* method,
106 Symbol* signature, bool is_static);
107 Method* get_method();
108 };
109
110 static LatestMethodCache _finalizer_register_cache; // Finalizer.register()
111 static LatestMethodCache _loader_addClass_cache; // ClassLoader.addClass()
112 static LatestMethodCache _throw_illegal_access_error_cache; // Unsafe.throwIllegalAccessError()
113 static LatestMethodCache _throw_no_such_method_error_cache; // Unsafe.throwNoSuchMethodError()
114 static LatestMethodCache _do_stack_walk_cache; // AbstractStackWalker.doStackWalk()
115
116 // Known objects
117 TypeArrayKlass* Universe::_typeArrayKlasses[T_LONG+1] = { nullptr /*, nullptr...*/ };
118 ObjArrayKlass* Universe::_objectArrayKlass = nullptr;
119 Klass* Universe::_fillerArrayKlass = nullptr;
120 OopHandle Universe::_basic_type_mirrors[T_VOID+1];
121 #if INCLUDE_CDS_JAVA_HEAP
122 int Universe::_archived_basic_type_mirror_indices[T_VOID+1];
123 #endif
124
125 OopHandle Universe::_main_thread_group;
126 OopHandle Universe::_system_thread_group;
127 OopHandle Universe::_the_empty_class_array;
128 OopHandle Universe::_the_null_string;
129 OopHandle Universe::_the_min_jint_string;
130
131 OopHandle Universe::_the_null_sentinel;
132
133 // _out_of_memory_errors is an objArray
134 enum OutOfMemoryInstance { _oom_java_heap,
135 _oom_c_heap,
136 _oom_metaspace,
137 _oom_class_metaspace,
138 _oom_array_size,
139 _oom_gc_overhead_limit,
140 _oom_realloc_objects,
141 _oom_count };
142
143 OopHandle Universe::_out_of_memory_errors;
144 OopHandle Universe:: _class_init_stack_overflow_error;
145 OopHandle Universe::_delayed_stack_overflow_error_message;
146 OopHandle Universe::_preallocated_out_of_memory_error_array;
147 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
148
149 // Message details for OOME objects, preallocate these objects since they could be
150 // used when throwing OOME, we should try to avoid further allocation in such case
151 OopHandle Universe::_msg_metaspace;
152 OopHandle Universe::_msg_class_metaspace;
153
154 OopHandle Universe::_reference_pending_list;
155
156 Array<Klass*>* Universe::_the_array_interfaces_array = nullptr;
157
158 long Universe::verify_flags = Universe::Verify_All;
159
160 Array<int>* Universe::_the_empty_int_array = nullptr;
161 Array<u2>* Universe::_the_empty_short_array = nullptr;
162 Array<Klass*>* Universe::_the_empty_klass_array = nullptr;
163 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = nullptr;
164 Array<Method*>* Universe::_the_empty_method_array = nullptr;
165
166 uintx Universe::_the_array_interfaces_bitmap = 0;
167 uintx Universe::_the_empty_klass_bitmap = 0;
168
169 // These variables are guarded by FullGCALot_lock.
170 DEBUG_ONLY(OopHandle Universe::_fullgc_alot_dummy_array;)
171 DEBUG_ONLY(int Universe::_fullgc_alot_dummy_next = 0;)
172
173 // Heap
174 int Universe::_verify_count = 0;
175
176 // Oop verification (see MacroAssembler::verify_oop)
177 uintptr_t Universe::_verify_oop_mask = 0;
178 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
179
180 int Universe::_base_vtable_size = 0;
181 bool Universe::_bootstrapping = false;
182 bool Universe::_module_initialized = false;
183 bool Universe::_fully_initialized = false;
184
185 OopStorage* Universe::_vm_weak = nullptr;
186 OopStorage* Universe::_vm_global = nullptr;
187
188 CollectedHeap* Universe::_collectedHeap = nullptr;
189
190 // These are the exceptions that are always created and are guatanteed to exist.
191 // If possible, they can be stored as CDS archived objects to speed up AOT code.
192 class BuiltinException {
193 OopHandle _instance;
194 CDS_JAVA_HEAP_ONLY(int _archived_root_index;)
195
196 public:
197 BuiltinException() : _instance() {
198 CDS_JAVA_HEAP_ONLY(_archived_root_index = 0);
199 }
200
201 void init_if_empty(Symbol* symbol, TRAPS) {
202 if (_instance.is_empty()) {
203 Klass* k = SystemDictionary::resolve_or_fail(symbol, true, CHECK);
204 oop obj = InstanceKlass::cast(k)->allocate_instance(CHECK);
205 _instance = OopHandle(Universe::vm_global(), obj);
206 }
207 }
208
209 oop instance() {
210 return _instance.resolve();
211 }
212
213 #if INCLUDE_CDS_JAVA_HEAP
214 void store_in_cds() {
215 _archived_root_index = HeapShared::archive_exception_instance(instance());
216 }
217
218 void load_from_cds() {
219 if (_archived_root_index >= 0) {
220 oop obj = HeapShared::get_root(_archived_root_index);
221 assert(obj != nullptr, "must be");
222 _instance = OopHandle(Universe::vm_global(), obj);
223 }
224 }
225
226 void serialize(SerializeClosure *f) {
227 f->do_int(&_archived_root_index);
228 }
229 #endif
230 };
231
232 static BuiltinException _null_ptr_exception;
233 static BuiltinException _arithmetic_exception;
234 static BuiltinException _internal_error;
235 static BuiltinException _array_index_out_of_bounds_exception;
236 static BuiltinException _array_store_exception;
237 static BuiltinException _class_cast_exception;
238
239 objArrayOop Universe::the_empty_class_array () {
240 return (objArrayOop)_the_empty_class_array.resolve();
241 }
242
243 oop Universe::main_thread_group() { return _main_thread_group.resolve(); }
244 void Universe::set_main_thread_group(oop group) { _main_thread_group = OopHandle(vm_global(), group); }
245
246 oop Universe::system_thread_group() { return _system_thread_group.resolve(); }
247 void Universe::set_system_thread_group(oop group) { _system_thread_group = OopHandle(vm_global(), group); }
248
249 oop Universe::the_null_string() { return _the_null_string.resolve(); }
250 oop Universe::the_min_jint_string() { return _the_min_jint_string.resolve(); }
251
252 oop Universe::null_ptr_exception_instance() { return _null_ptr_exception.instance(); }
253 oop Universe::arithmetic_exception_instance() { return _arithmetic_exception.instance(); }
254 oop Universe::internal_error_instance() { return _internal_error.instance(); }
255 oop Universe::array_index_out_of_bounds_exception_instance() { return _array_index_out_of_bounds_exception.instance(); }
256 oop Universe::array_store_exception_instance() { return _array_store_exception.instance(); }
257 oop Universe::class_cast_exception_instance() { return _class_cast_exception.instance(); }
258
259 oop Universe::the_null_sentinel() { return _the_null_sentinel.resolve(); }
260
261 oop Universe::int_mirror() { return check_mirror(_basic_type_mirrors[T_INT].resolve()); }
262 oop Universe::float_mirror() { return check_mirror(_basic_type_mirrors[T_FLOAT].resolve()); }
263 oop Universe::double_mirror() { return check_mirror(_basic_type_mirrors[T_DOUBLE].resolve()); }
264 oop Universe::byte_mirror() { return check_mirror(_basic_type_mirrors[T_BYTE].resolve()); }
265 oop Universe::bool_mirror() { return check_mirror(_basic_type_mirrors[T_BOOLEAN].resolve()); }
266 oop Universe::char_mirror() { return check_mirror(_basic_type_mirrors[T_CHAR].resolve()); }
267 oop Universe::long_mirror() { return check_mirror(_basic_type_mirrors[T_LONG].resolve()); }
268 oop Universe::short_mirror() { return check_mirror(_basic_type_mirrors[T_SHORT].resolve()); }
269 oop Universe::void_mirror() { return check_mirror(_basic_type_mirrors[T_VOID].resolve()); }
270
271 oop Universe::java_mirror(BasicType t) {
272 assert((uint)t < T_VOID+1, "range check");
273 assert(!is_reference_type(t), "sanity");
274 return check_mirror(_basic_type_mirrors[t].resolve());
275 }
276
277 void Universe::basic_type_classes_do(KlassClosure *closure) {
278 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
279 closure->do_klass(_typeArrayKlasses[i]);
280 }
281 // We don't do the following because it will confuse JVMTI.
282 // _fillerArrayKlass is used only by GC, which doesn't need to see
283 // this klass from basic_type_classes_do().
284 //
285 // closure->do_klass(_fillerArrayKlass);
286 }
287
288 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
289 it->push(&_fillerArrayKlass);
290 for (int i = 0; i < T_LONG+1; i++) {
291 it->push(&_typeArrayKlasses[i]);
292 }
293 it->push(&_objectArrayKlass);
294
295 it->push(&_the_empty_int_array);
296 it->push(&_the_empty_short_array);
297 it->push(&_the_empty_klass_array);
298 it->push(&_the_empty_instance_klass_array);
299 it->push(&_the_empty_method_array);
300 it->push(&_the_array_interfaces_array);
301 }
302
303 #if INCLUDE_CDS_JAVA_HEAP
304 void Universe::set_archived_basic_type_mirror_index(BasicType t, int index) {
305 assert(CDSConfig::is_dumping_heap(), "sanity");
306 assert(!is_reference_type(t), "sanity");
307 _archived_basic_type_mirror_indices[t] = index;
308 }
309
310 void Universe::archive_exception_instances() {
311 _null_ptr_exception.store_in_cds();
312 _arithmetic_exception.store_in_cds();
313 _internal_error.store_in_cds();
314 _array_index_out_of_bounds_exception.store_in_cds();
315 _array_store_exception.store_in_cds();
316 _class_cast_exception.store_in_cds();
317 }
318
319 void Universe::load_archived_object_instances() {
320 if (ArchiveHeapLoader::is_in_use()) {
321 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
322 int index = _archived_basic_type_mirror_indices[i];
323 if (!is_reference_type((BasicType)i) && index >= 0) {
324 oop mirror_oop = HeapShared::get_root(index);
325 assert(mirror_oop != nullptr, "must be");
326 _basic_type_mirrors[i] = OopHandle(vm_global(), mirror_oop);
327 }
328 }
329
330 _null_ptr_exception.load_from_cds();
331 _arithmetic_exception.load_from_cds();
332 _internal_error.load_from_cds();
333 _array_index_out_of_bounds_exception.load_from_cds();
334 _array_store_exception.load_from_cds();
335 _class_cast_exception.load_from_cds();
336 }
337 }
338 #endif
339
340 void Universe::serialize(SerializeClosure* f) {
341
342 #if INCLUDE_CDS_JAVA_HEAP
343 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
344 f->do_int(&_archived_basic_type_mirror_indices[i]);
345 // if f->reading(): We can't call HeapShared::get_root() yet, as the heap
346 // contents may need to be relocated. _basic_type_mirrors[i] will be
347 // updated later in Universe::load_archived_object_instances().
348 }
349 _null_ptr_exception.serialize(f);
350 _arithmetic_exception.serialize(f);
351 _internal_error.serialize(f);
352 _array_index_out_of_bounds_exception.serialize(f);
353 _array_store_exception.serialize(f);
354 _class_cast_exception.serialize(f);
355 #endif
356
357 f->do_ptr(&_fillerArrayKlass);
358 for (int i = 0; i < T_LONG+1; i++) {
359 f->do_ptr(&_typeArrayKlasses[i]);
360 }
361
362 f->do_ptr(&_objectArrayKlass);
363 f->do_ptr(&_the_array_interfaces_array);
364 f->do_ptr(&_the_empty_int_array);
365 f->do_ptr(&_the_empty_short_array);
366 f->do_ptr(&_the_empty_method_array);
367 f->do_ptr(&_the_empty_klass_array);
368 f->do_ptr(&_the_empty_instance_klass_array);
369 }
370
371
372 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
373 if (size < alignment || size % alignment != 0) {
374 vm_exit_during_initialization(
375 err_msg("Size of %s (%zu bytes) must be aligned to %zu bytes", name, size, alignment));
376 }
377 }
378
379 static void initialize_basic_type_klass(Klass* k, TRAPS) {
380 Klass* ok = vmClasses::Object_klass();
381 #if INCLUDE_CDS
382 if (CDSConfig::is_using_archive()) {
383 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
384 assert(k->super() == ok, "u3");
385 if (k->is_instance_klass()) {
386 InstanceKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), nullptr, CHECK);
387 } else {
388 ArrayKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), CHECK);
389 }
390 } else
391 #endif
392 {
393 k->initialize_supers(ok, nullptr, CHECK);
394 }
395 k->append_to_sibling_list();
396 }
397
398 void Universe::genesis(TRAPS) {
399 ResourceMark rm(THREAD);
400 HandleMark hm(THREAD);
401
402 // Explicit null checks are needed if these offsets are not smaller than the page size
403 if (UseCompactObjectHeaders) {
404 assert(oopDesc::mark_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()),
405 "Mark offset is expected to be less than the page size");
406 } else {
407 assert(oopDesc::klass_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()),
408 "Klass offset is expected to be less than the page size");
409 }
410 assert(arrayOopDesc::length_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()),
411 "Array length offset is expected to be less than the page size");
412
413 { AutoModifyRestore<bool> temporarily(_bootstrapping, true);
414
415 java_lang_Class::allocate_fixup_lists();
416
417 // determine base vtable size; without that we cannot create the array klasses
418 compute_base_vtable_size();
419
420 if (!CDSConfig::is_using_archive()) {
421 // Initialization of the fillerArrayKlass must come before regular
422 // int-TypeArrayKlass so that the int-Array mirror points to the
423 // int-TypeArrayKlass.
424 _fillerArrayKlass = TypeArrayKlass::create_klass(T_INT, "[Ljdk/internal/vm/FillerElement;", CHECK);
425 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
426 _typeArrayKlasses[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK);
427 }
428
429 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
430
431 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, nullptr, CHECK);
432 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
433 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
434 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
435 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
436 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK);
437 }
438
439 vmSymbols::initialize();
440
441 // Initialize table for matching jmethodID, before SystemDictionary.
442 JmethodIDTable::initialize();
443
444 SystemDictionary::initialize(CHECK);
445
446 // Create string constants
447 oop s = StringTable::intern("null", CHECK);
448 _the_null_string = OopHandle(vm_global(), s);
449 s = StringTable::intern("-2147483648", CHECK);
450 _the_min_jint_string = OopHandle(vm_global(), s);
451
452 #if INCLUDE_CDS
453 if (CDSConfig::is_using_archive()) {
454 // Verify shared interfaces array.
455 assert(_the_array_interfaces_array->at(0) ==
456 vmClasses::Cloneable_klass(), "u3");
457 assert(_the_array_interfaces_array->at(1) ==
458 vmClasses::Serializable_klass(), "u3");
459 } else
460 #endif
461 {
462 // Set up shared interfaces array. (Do this before supers are set up.)
463 _the_array_interfaces_array->at_put(0, vmClasses::Cloneable_klass());
464 _the_array_interfaces_array->at_put(1, vmClasses::Serializable_klass());
465 }
466
467 _the_array_interfaces_bitmap = Klass::compute_secondary_supers_bitmap(_the_array_interfaces_array);
468 _the_empty_klass_bitmap = Klass::compute_secondary_supers_bitmap(_the_empty_klass_array);
469
470 initialize_basic_type_klass(_fillerArrayKlass, CHECK);
471
472 initialize_basic_type_klass(boolArrayKlass(), CHECK);
473 initialize_basic_type_klass(charArrayKlass(), CHECK);
474 initialize_basic_type_klass(floatArrayKlass(), CHECK);
475 initialize_basic_type_klass(doubleArrayKlass(), CHECK);
476 initialize_basic_type_klass(byteArrayKlass(), CHECK);
477 initialize_basic_type_klass(shortArrayKlass(), CHECK);
478 initialize_basic_type_klass(intArrayKlass(), CHECK);
479 initialize_basic_type_klass(longArrayKlass(), CHECK);
480
481 assert(_fillerArrayKlass != intArrayKlass(),
482 "Internal filler array klass should be different to int array Klass");
483 } // end of core bootstrapping
484
485 {
486 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
487 _the_null_sentinel = OopHandle(vm_global(), tns());
488 }
489
490 // Create a handle for reference_pending_list
491 _reference_pending_list = OopHandle(vm_global(), nullptr);
492
493 // Maybe this could be lifted up now that object array can be initialized
494 // during the bootstrapping.
495
496 // OLD
497 // Initialize _objectArrayKlass after core bootstraping to make
498 // sure the super class is set up properly for _objectArrayKlass.
499 // ---
500 // NEW
501 // Since some of the old system object arrays have been converted to
502 // ordinary object arrays, _objectArrayKlass will be loaded when
503 // SystemDictionary::initialize(CHECK); is run. See the extra check
504 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
505 {
506 Klass* oak = vmClasses::Object_klass()->array_klass(CHECK);
507 _objectArrayKlass = ObjArrayKlass::cast(oak);
508 }
509 // OLD
510 // Add the class to the class hierarchy manually to make sure that
511 // its vtable is initialized after core bootstrapping is completed.
512 // ---
513 // New
514 // Have already been initialized.
515 _objectArrayKlass->append_to_sibling_list();
516
517 #ifdef ASSERT
518 if (FullGCALot) {
519 // Allocate an array of dummy objects.
520 // We'd like these to be at the bottom of the old generation,
521 // so that when we free one and then collect,
522 // (almost) the whole heap moves
523 // and we find out if we actually update all the oops correctly.
524 // But we can't allocate directly in the old generation,
525 // so we allocate wherever, and hope that the first collection
526 // moves these objects to the bottom of the old generation.
527 int size = FullGCALotDummies * 2;
528
529 objArrayOop naked_array = oopFactory::new_objArray(vmClasses::Object_klass(), size, CHECK);
530 objArrayHandle dummy_array(THREAD, naked_array);
531 int i = 0;
532 while (i < size) {
533 // Allocate dummy in old generation
534 oop dummy = vmClasses::Object_klass()->allocate_instance(CHECK);
535 dummy_array->obj_at_put(i++, dummy);
536 }
537 {
538 // Only modify the global variable inside the mutex.
539 // If we had a race to here, the other dummy_array instances
540 // and their elements just get dropped on the floor, which is fine.
541 MutexLocker ml(THREAD, FullGCALot_lock);
542 if (_fullgc_alot_dummy_array.is_empty()) {
543 _fullgc_alot_dummy_array = OopHandle(vm_global(), dummy_array());
544 }
545 }
546 assert(i == ((objArrayOop)_fullgc_alot_dummy_array.resolve())->length(), "just checking");
547 }
548 #endif
549 }
550
551 void Universe::initialize_basic_type_mirrors(TRAPS) {
552 #if INCLUDE_CDS_JAVA_HEAP
553 if (CDSConfig::is_using_archive() &&
554 ArchiveHeapLoader::is_in_use() &&
555 _basic_type_mirrors[T_INT].resolve() != nullptr) {
556 assert(ArchiveHeapLoader::can_use(), "Sanity");
557
558 // check that all basic type mirrors are mapped also
559 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
560 if (!is_reference_type((BasicType)i)) {
561 oop m = _basic_type_mirrors[i].resolve();
562 assert(m != nullptr, "archived mirrors should not be null");
563 }
564 }
565 } else
566 // _basic_type_mirrors[T_INT], etc, are null if archived heap is not mapped.
567 #endif
568 {
569 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
570 BasicType bt = (BasicType)i;
571 if (!is_reference_type(bt)) {
572 oop m = java_lang_Class::create_basic_type_mirror(type2name(bt), bt, CHECK);
573 _basic_type_mirrors[i] = OopHandle(vm_global(), m);
574 }
575 CDS_JAVA_HEAP_ONLY(_archived_basic_type_mirror_indices[i] = -1);
576 }
577 }
578 if (CDSConfig::is_dumping_heap()) {
579 HeapShared::init_scratch_objects_for_basic_type_mirrors(CHECK);
580 }
581 }
582
583 void Universe::fixup_mirrors(TRAPS) {
584 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
585 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
586 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
587 // that the number of objects allocated at this point is very small.
588 assert(vmClasses::Class_klass_loaded(), "java.lang.Class should be loaded");
589 HandleMark hm(THREAD);
590
591 if (!CDSConfig::is_using_archive()) {
592 // Cache the start of the static fields
593 InstanceMirrorKlass::init_offset_of_static_fields();
594 }
595
596 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
597 int list_length = list->length();
598 for (int i = 0; i < list_length; i++) {
599 Klass* k = list->at(i);
600 assert(k->is_klass(), "List should only hold classes");
601 java_lang_Class::fixup_mirror(k, CATCH);
602 }
603 delete java_lang_Class::fixup_mirror_list();
604 java_lang_Class::set_fixup_mirror_list(nullptr);
605 }
606
607 #define assert_pll_locked(test) \
608 assert(Heap_lock->test(), "Reference pending list access requires lock")
609
610 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
611
612 oop Universe::reference_pending_list() {
613 if (Thread::current()->is_VM_thread()) {
614 assert_pll_locked(is_locked);
615 } else {
616 assert_pll_ownership();
617 }
618 return _reference_pending_list.resolve();
619 }
620
621 void Universe::clear_reference_pending_list() {
622 assert_pll_ownership();
623 _reference_pending_list.replace(nullptr);
624 }
625
626 bool Universe::has_reference_pending_list() {
627 assert_pll_ownership();
628 return _reference_pending_list.peek() != nullptr;
629 }
630
631 oop Universe::swap_reference_pending_list(oop list) {
632 assert_pll_locked(is_locked);
633 return _reference_pending_list.xchg(list);
634 }
635
636 #undef assert_pll_locked
637 #undef assert_pll_ownership
638
639 static void reinitialize_vtables() {
640 // The vtables are initialized by starting at java.lang.Object and
641 // initializing through the subclass links, so that the super
642 // classes are always initialized first.
643 for (ClassHierarchyIterator iter(vmClasses::Object_klass()); !iter.done(); iter.next()) {
644 Klass* sub = iter.klass();
645 sub->vtable().initialize_vtable();
646 }
647 }
648
649 static void reinitialize_itables() {
650
651 class ReinitTableClosure : public KlassClosure {
652 public:
653 void do_klass(Klass* k) {
654 if (k->is_instance_klass()) {
655 InstanceKlass::cast(k)->itable().initialize_itable();
656 }
657 }
658 };
659
660 MutexLocker mcld(ClassLoaderDataGraph_lock);
661 ReinitTableClosure cl;
662 ClassLoaderDataGraph::classes_do(&cl);
663 }
664
665 bool Universe::on_page_boundary(void* addr) {
666 return is_aligned(addr, os::vm_page_size());
667 }
668
669 // the array of preallocated errors with backtraces
670 objArrayOop Universe::preallocated_out_of_memory_errors() {
671 return (objArrayOop)_preallocated_out_of_memory_error_array.resolve();
672 }
673
674 objArrayOop Universe::out_of_memory_errors() { return (objArrayOop)_out_of_memory_errors.resolve(); }
675
676 oop Universe::out_of_memory_error_java_heap() {
677 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_java_heap));
678 }
679
680 oop Universe::out_of_memory_error_java_heap_without_backtrace() {
681 return out_of_memory_errors()->obj_at(_oom_java_heap);
682 }
683
684 oop Universe::out_of_memory_error_c_heap() {
685 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_c_heap));
686 }
687
688 oop Universe::out_of_memory_error_metaspace() {
689 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_metaspace));
690 }
691
692 oop Universe::out_of_memory_error_class_metaspace() {
693 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_class_metaspace));
694 }
695
696 oop Universe::out_of_memory_error_array_size() {
697 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_array_size));
698 }
699
700 oop Universe::out_of_memory_error_gc_overhead_limit() {
701 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_gc_overhead_limit));
702 }
703
704 oop Universe::out_of_memory_error_realloc_objects() {
705 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_realloc_objects));
706 }
707
708 oop Universe::class_init_out_of_memory_error() { return out_of_memory_errors()->obj_at(_oom_java_heap); }
709 oop Universe::class_init_stack_overflow_error() { return _class_init_stack_overflow_error.resolve(); }
710 oop Universe::delayed_stack_overflow_error_message() { return _delayed_stack_overflow_error_message.resolve(); }
711
712
713 bool Universe::should_fill_in_stack_trace(Handle throwable) {
714 // never attempt to fill in the stack trace of preallocated errors that do not have
715 // backtrace. These errors are kept alive forever and may be "re-used" when all
716 // preallocated errors with backtrace have been consumed. Also need to avoid
717 // a potential loop which could happen if an out of memory occurs when attempting
718 // to allocate the backtrace.
719 objArrayOop preallocated_oom = out_of_memory_errors();
720 for (int i = 0; i < _oom_count; i++) {
721 if (throwable() == preallocated_oom->obj_at(i)) {
722 return false;
723 }
724 }
725 return true;
726 }
727
728
729 oop Universe::gen_out_of_memory_error(oop default_err) {
730 // generate an out of memory error:
731 // - if there is a preallocated error and stack traces are available
732 // (j.l.Throwable is initialized), then return the preallocated
733 // error with a filled in stack trace, and with the message
734 // provided by the default error.
735 // - otherwise, return the default error, without a stack trace.
736 int next;
737 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
738 vmClasses::Throwable_klass()->is_initialized()) {
739 next = (int)Atomic::add(&_preallocated_out_of_memory_error_avail_count, -1);
740 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
741 } else {
742 next = -1;
743 }
744 if (next < 0) {
745 // all preallocated errors have been used.
746 // return default
747 return default_err;
748 } else {
749 JavaThread* current = JavaThread::current();
750 Handle default_err_h(current, default_err);
751 // get the error object at the slot and set set it to null so that the
752 // array isn't keeping it alive anymore.
753 Handle exc(current, preallocated_out_of_memory_errors()->obj_at(next));
754 assert(exc() != nullptr, "slot has been used already");
755 preallocated_out_of_memory_errors()->obj_at_put(next, nullptr);
756
757 // use the message from the default error
758 oop msg = java_lang_Throwable::message(default_err_h());
759 assert(msg != nullptr, "no message");
760 java_lang_Throwable::set_message(exc(), msg);
761
762 // populate the stack trace and return it.
763 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
764 return exc();
765 }
766 }
767
768 bool Universe::is_out_of_memory_error_metaspace(oop ex_obj) {
769 return java_lang_Throwable::message(ex_obj) == _msg_metaspace.resolve();
770 }
771
772 bool Universe::is_out_of_memory_error_class_metaspace(oop ex_obj) {
773 return java_lang_Throwable::message(ex_obj) == _msg_class_metaspace.resolve();
774 }
775
776 // Setup preallocated OutOfMemoryError errors
777 void Universe::create_preallocated_out_of_memory_errors(TRAPS) {
778 InstanceKlass* ik = vmClasses::OutOfMemoryError_klass();
779 objArrayOop oa = oopFactory::new_objArray(ik, _oom_count, CHECK);
780 objArrayHandle oom_array(THREAD, oa);
781
782 for (int i = 0; i < _oom_count; i++) {
783 oop oom_obj = ik->allocate_instance(CHECK);
784 oom_array->obj_at_put(i, oom_obj);
785 }
786 _out_of_memory_errors = OopHandle(vm_global(), oom_array());
787
788 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK);
789 java_lang_Throwable::set_message(oom_array->obj_at(_oom_java_heap), msg());
790
791 msg = java_lang_String::create_from_str("C heap space", CHECK);
792 java_lang_Throwable::set_message(oom_array->obj_at(_oom_c_heap), msg());
793
794 msg = java_lang_String::create_from_str("Metaspace", CHECK);
795 _msg_metaspace = OopHandle(vm_global(), msg());
796 java_lang_Throwable::set_message(oom_array->obj_at(_oom_metaspace), msg());
797
798 msg = java_lang_String::create_from_str("Compressed class space", CHECK);
799 _msg_class_metaspace = OopHandle(vm_global(), msg());
800 java_lang_Throwable::set_message(oom_array->obj_at(_oom_class_metaspace), msg());
801
802 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK);
803 java_lang_Throwable::set_message(oom_array->obj_at(_oom_array_size), msg());
804
805 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK);
806 java_lang_Throwable::set_message(oom_array->obj_at(_oom_gc_overhead_limit), msg());
807
808 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK);
809 java_lang_Throwable::set_message(oom_array->obj_at(_oom_realloc_objects), msg());
810
811 // Setup the array of errors that have preallocated backtrace
812 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
813 objArrayOop instance = oopFactory::new_objArray(ik, len, CHECK);
814 _preallocated_out_of_memory_error_array = OopHandle(vm_global(), instance);
815 objArrayHandle preallocated_oom_array(THREAD, instance);
816
817 for (int i=0; i<len; i++) {
818 oop err = ik->allocate_instance(CHECK);
819 Handle err_h(THREAD, err);
820 java_lang_Throwable::allocate_backtrace(err_h, CHECK);
821 preallocated_oom_array->obj_at_put(i, err_h());
822 }
823 _preallocated_out_of_memory_error_avail_count = (jint)len;
824 }
825
826 intptr_t Universe::_non_oop_bits = 0;
827
828 void* Universe::non_oop_word() {
829 // Neither the high bits nor the low bits of this value is allowed
830 // to look like (respectively) the high or low bits of a real oop.
831 //
832 // High and low are CPU-specific notions, but low always includes
833 // the low-order bit. Since oops are always aligned at least mod 4,
834 // setting the low-order bit will ensure that the low half of the
835 // word will never look like that of a real oop.
836 //
837 // Using the OS-supplied non-memory-address word (usually 0 or -1)
838 // will take care of the high bits, however many there are.
839
840 if (_non_oop_bits == 0) {
841 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
842 }
843
844 return (void*)_non_oop_bits;
845 }
846
847 bool Universe::contains_non_oop_word(void* p) {
848 return *(void**)p == non_oop_word();
849 }
850
851 static void initialize_global_behaviours() {
852 DefaultICProtectionBehaviour* protection_behavior = new DefaultICProtectionBehaviour();
853 // Ignore leak of DefaultICProtectionBehaviour. It is overriden by some GC implementations and the
854 // pointer is leaked once.
855 LSAN_IGNORE_OBJECT(protection_behavior);
856 CompiledICProtectionBehaviour::set_current(protection_behavior);
857 }
858
859 jint universe_init() {
860 assert(!Universe::_fully_initialized, "called after initialize_vtables");
861 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
862 "LogHeapWordSize is incorrect.");
863 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
864 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
865 "oop size is not not a multiple of HeapWord size");
866
867 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
868
869 initialize_global_behaviours();
870
871 GCLogPrecious::initialize();
872
873 // Initialize CPUTimeCounters object, which must be done before creation of the heap.
874 CPUTimeCounters::initialize();
875
876 ObjLayout::initialize();
877
878 #ifdef _LP64
879 MetaspaceShared::adjust_heap_sizes_for_dumping();
880 #endif // _LP64
881
882 GCConfig::arguments()->initialize_heap_sizes();
883
884 jint status = Universe::initialize_heap();
885 if (status != JNI_OK) {
886 return status;
887 }
888
889 Universe::initialize_tlab();
890
891 Metaspace::global_initialize();
892
893 // Initialize performance counters for metaspaces
894 MetaspaceCounters::initialize_performance_counters();
895
896 // Checks 'AfterMemoryInit' constraints.
897 if (!JVMFlagLimit::check_all_constraints(JVMFlagConstraintPhase::AfterMemoryInit)) {
898 return JNI_EINVAL;
899 }
900
901 #if INCLUDE_CDS
902 if (CDSConfig::is_using_archive()) {
903 // Read the data structures supporting the shared spaces (shared
904 // system dictionary, symbol table, etc.)
905 MetaspaceShared::initialize_shared_spaces();
906 }
907 #endif
908
909 ClassLoaderData::init_null_class_loader_data();
910
911 #if INCLUDE_CDS
912 #if INCLUDE_CDS_JAVA_HEAP
913 if (CDSConfig::is_using_full_module_graph()) {
914 ClassLoaderDataShared::restore_archived_entries_for_null_class_loader_data();
915 }
916 #endif // INCLUDE_CDS_JAVA_HEAP
917 if (CDSConfig::is_dumping_archive()) {
918 CDSConfig::prepare_for_dumping();
919 }
920 #endif
921
922 SymbolTable::create_table();
923 StringTable::create_table();
924
925 if (strlen(VerifySubSet) > 0) {
926 Universe::initialize_verify_flags();
927 }
928
929 ResolvedMethodTable::create_table();
930
931 return JNI_OK;
932 }
933
934 jint Universe::initialize_heap() {
935 assert(_collectedHeap == nullptr, "Heap already created");
936 _collectedHeap = GCConfig::arguments()->create_heap();
937
938 log_info(gc)("Using %s", _collectedHeap->name());
939 return _collectedHeap->initialize();
940 }
941
942 void Universe::initialize_tlab() {
943 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
944 PLAB::startup_initialization();
945 if (UseTLAB) {
946 ThreadLocalAllocBuffer::startup_initialization();
947 }
948 }
949
950 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
951
952 assert(alignment <= Arguments::conservative_max_heap_alignment(),
953 "actual alignment %zu must be within maximum heap alignment %zu",
954 alignment, Arguments::conservative_max_heap_alignment());
955 assert(is_aligned(heap_size, alignment), "precondition");
956
957 size_t total_reserved = heap_size;
958 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
959 "heap size is too big for compressed oops");
960
961 size_t page_size = os::vm_page_size();
962 if (UseLargePages && is_aligned(alignment, os::large_page_size())) {
963 page_size = os::large_page_size();
964 } else {
965 // Parallel is the only collector that might opt out of using large pages
966 // for the heap.
967 assert(!UseLargePages || UseParallelGC , "Wrong alignment to use large pages");
968 }
969
970 // Now create the space.
971 ReservedHeapSpace rhs = HeapReserver::reserve(total_reserved, alignment, page_size, AllocateHeapAt);
972
973 if (!rhs.is_reserved()) {
974 vm_exit_during_initialization(
975 err_msg("Could not reserve enough space for %zu KB object heap",
976 total_reserved/K));
977 }
978
979 assert(total_reserved == rhs.size(), "must be exactly of required size");
980 assert(is_aligned(rhs.base(),alignment),"must be exactly of required alignment");
981
982 assert(markWord::encode_pointer_as_mark(rhs.base()).decode_pointer() == rhs.base(),
983 "area must be distinguishable from marks for mark-sweep");
984 assert(markWord::encode_pointer_as_mark(&rhs.base()[rhs.size()]).decode_pointer() ==
985 &rhs.base()[rhs.size()],
986 "area must be distinguishable from marks for mark-sweep");
987
988 // We are good.
989
990 if (AllocateHeapAt != nullptr) {
991 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
992 }
993
994 if (UseCompressedOops) {
995 CompressedOops::initialize(rhs);
996 }
997
998 Universe::calculate_verify_data((HeapWord*)rhs.base(), (HeapWord*)rhs.end());
999
1000 return rhs;
1001 }
1002
1003 OopStorage* Universe::vm_weak() {
1004 return Universe::_vm_weak;
1005 }
1006
1007 OopStorage* Universe::vm_global() {
1008 return Universe::_vm_global;
1009 }
1010
1011 void Universe::oopstorage_init() {
1012 Universe::_vm_global = OopStorageSet::create_strong("VM Global", mtInternal);
1013 Universe::_vm_weak = OopStorageSet::create_weak("VM Weak", mtInternal);
1014 }
1015
1016 void universe_oopstorage_init() {
1017 Universe::oopstorage_init();
1018 }
1019
1020 void LatestMethodCache::init(JavaThread* current, InstanceKlass* ik,
1021 const char* method, Symbol* signature, bool is_static)
1022 {
1023 TempNewSymbol name = SymbolTable::new_symbol(method);
1024 Method* m = nullptr;
1025 // The klass must be linked before looking up the method.
1026 if (!ik->link_class_or_fail(current) ||
1027 ((m = ik->find_method(name, signature)) == nullptr) ||
1028 is_static != m->is_static()) {
1029 ResourceMark rm(current);
1030 // NoSuchMethodException doesn't actually work because it tries to run the
1031 // <init> function before java_lang_Class is linked. Print error and exit.
1032 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
1033 ik->name()->as_C_string(), method));
1034 }
1035
1036 _klass = ik;
1037 _method_idnum = m->method_idnum();
1038 assert(_method_idnum >= 0, "sanity check");
1039 }
1040
1041 Method* LatestMethodCache::get_method() {
1042 if (_klass == nullptr) {
1043 return nullptr;
1044 } else {
1045 Method* m = _klass->method_with_idnum(_method_idnum);
1046 assert(m != nullptr, "sanity check");
1047 return m;
1048 }
1049 }
1050
1051 Method* Universe::finalizer_register_method() { return _finalizer_register_cache.get_method(); }
1052 Method* Universe::loader_addClass_method() { return _loader_addClass_cache.get_method(); }
1053 Method* Universe::throw_illegal_access_error() { return _throw_illegal_access_error_cache.get_method(); }
1054 Method* Universe::throw_no_such_method_error() { return _throw_no_such_method_error_cache.get_method(); }
1055 Method* Universe::do_stack_walk_method() { return _do_stack_walk_cache.get_method(); }
1056
1057 void Universe::initialize_known_methods(JavaThread* current) {
1058 // Set up static method for registering finalizers
1059 _finalizer_register_cache.init(current,
1060 vmClasses::Finalizer_klass(),
1061 "register",
1062 vmSymbols::object_void_signature(), true);
1063
1064 _throw_illegal_access_error_cache.init(current,
1065 vmClasses::internal_Unsafe_klass(),
1066 "throwIllegalAccessError",
1067 vmSymbols::void_method_signature(), true);
1068
1069 _throw_no_such_method_error_cache.init(current,
1070 vmClasses::internal_Unsafe_klass(),
1071 "throwNoSuchMethodError",
1072 vmSymbols::void_method_signature(), true);
1073
1074 // Set up method for registering loaded classes in class loader vector
1075 _loader_addClass_cache.init(current,
1076 vmClasses::ClassLoader_klass(),
1077 "addClass",
1078 vmSymbols::class_void_signature(), false);
1079
1080 // Set up method for stack walking
1081 _do_stack_walk_cache.init(current,
1082 vmClasses::AbstractStackWalker_klass(),
1083 "doStackWalk",
1084 vmSymbols::doStackWalk_signature(), false);
1085 }
1086
1087 void universe2_init() {
1088 EXCEPTION_MARK;
1089 Universe::genesis(CATCH);
1090 }
1091
1092 // Set after initialization of the module runtime, call_initModuleRuntime
1093 void universe_post_module_init() {
1094 Universe::_module_initialized = true;
1095 }
1096
1097 bool universe_post_init() {
1098 assert(!is_init_completed(), "Error: initialization not yet completed!");
1099 Universe::_fully_initialized = true;
1100 EXCEPTION_MARK;
1101 if (!CDSConfig::is_using_archive()) {
1102 reinitialize_vtables();
1103 reinitialize_itables();
1104 }
1105
1106 HandleMark hm(THREAD);
1107 // Setup preallocated empty java.lang.Class array for Method reflection.
1108
1109 objArrayOop the_empty_class_array = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_false);
1110 Universe::_the_empty_class_array = OopHandle(Universe::vm_global(), the_empty_class_array);
1111
1112 // Setup preallocated OutOfMemoryError errors
1113 Universe::create_preallocated_out_of_memory_errors(CHECK_false);
1114
1115 oop instance;
1116 // Setup preallocated cause message for delayed StackOverflowError
1117 if (StackReservedPages > 0) {
1118 instance = java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
1119 Universe::_delayed_stack_overflow_error_message = OopHandle(Universe::vm_global(), instance);
1120 }
1121
1122 // Setup preallocated exceptions used for a cheap & dirty solution in compiler exception handling
1123 _null_ptr_exception.init_if_empty(vmSymbols::java_lang_NullPointerException(), CHECK_false);
1124 _arithmetic_exception.init_if_empty(vmSymbols::java_lang_ArithmeticException(), CHECK_false);
1125 _array_index_out_of_bounds_exception.init_if_empty(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), CHECK_false);
1126 _array_store_exception.init_if_empty(vmSymbols::java_lang_ArrayStoreException(), CHECK_false);
1127 _class_cast_exception.init_if_empty(vmSymbols::java_lang_ClassCastException(), CHECK_false);
1128
1129 // Virtual Machine Error for when we get into a situation we can't resolve
1130 Klass* k = vmClasses::InternalError_klass();
1131 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1132 if (!linked) {
1133 tty->print_cr("Unable to link/verify InternalError class");
1134 return false; // initialization failed
1135 }
1136 _internal_error.init_if_empty(vmSymbols::java_lang_InternalError(), CHECK_false);
1137
1138 Handle msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1139 java_lang_Throwable::set_message(Universe::arithmetic_exception_instance(), msg());
1140
1141 // Setup preallocated StackOverflowError for use with class initialization failure
1142 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_StackOverflowError(), true, CHECK_false);
1143 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1144 Universe::_class_init_stack_overflow_error = OopHandle(Universe::vm_global(), instance);
1145
1146 Universe::initialize_known_methods(THREAD);
1147
1148 // This needs to be done before the first scavenge/gc, since
1149 // it's an input to soft ref clearing policy.
1150 {
1151 MutexLocker x(THREAD, Heap_lock);
1152 Universe::heap()->update_capacity_and_used_at_gc();
1153 }
1154
1155 // ("weak") refs processing infrastructure initialization
1156 Universe::heap()->post_initialize();
1157
1158 MemoryService::add_metaspace_memory_pools();
1159
1160 MemoryService::set_universe_heap(Universe::heap());
1161 #if INCLUDE_CDS
1162 MetaspaceShared::post_initialize(CHECK_false);
1163 #endif
1164 return true;
1165 }
1166
1167
1168 void Universe::compute_base_vtable_size() {
1169 _base_vtable_size = ClassLoader::compute_Object_vtable();
1170 }
1171
1172 void Universe::print_on(outputStream* st) {
1173 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1174 st->print_cr("Heap");
1175
1176 StreamIndentor si(st, 1);
1177 heap()->print_heap_on(st);
1178 MetaspaceUtils::print_on(st);
1179 }
1180
1181 void Universe::print_heap_at_SIGBREAK() {
1182 if (PrintHeapAtSIGBREAK) {
1183 print_on(tty);
1184 tty->cr();
1185 tty->flush();
1186 }
1187 }
1188
1189 void Universe::initialize_verify_flags() {
1190 verify_flags = 0;
1191 const char delimiter[] = " ,";
1192
1193 size_t length = strlen(VerifySubSet);
1194 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1195 strncpy(subset_list, VerifySubSet, length + 1);
1196 char* save_ptr;
1197
1198 char* token = strtok_r(subset_list, delimiter, &save_ptr);
1199 while (token != nullptr) {
1200 if (strcmp(token, "threads") == 0) {
1201 verify_flags |= Verify_Threads;
1202 } else if (strcmp(token, "heap") == 0) {
1203 verify_flags |= Verify_Heap;
1204 } else if (strcmp(token, "symbol_table") == 0) {
1205 verify_flags |= Verify_SymbolTable;
1206 } else if (strcmp(token, "string_table") == 0) {
1207 verify_flags |= Verify_StringTable;
1208 } else if (strcmp(token, "codecache") == 0) {
1209 verify_flags |= Verify_CodeCache;
1210 } else if (strcmp(token, "dictionary") == 0) {
1211 verify_flags |= Verify_SystemDictionary;
1212 } else if (strcmp(token, "classloader_data_graph") == 0) {
1213 verify_flags |= Verify_ClassLoaderDataGraph;
1214 } else if (strcmp(token, "metaspace") == 0) {
1215 verify_flags |= Verify_MetaspaceUtils;
1216 } else if (strcmp(token, "jni_handles") == 0) {
1217 verify_flags |= Verify_JNIHandles;
1218 } else if (strcmp(token, "codecache_oops") == 0) {
1219 verify_flags |= Verify_CodeCacheOops;
1220 } else if (strcmp(token, "resolved_method_table") == 0) {
1221 verify_flags |= Verify_ResolvedMethodTable;
1222 } else if (strcmp(token, "stringdedup") == 0) {
1223 verify_flags |= Verify_StringDedup;
1224 } else {
1225 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1226 }
1227 token = strtok_r(nullptr, delimiter, &save_ptr);
1228 }
1229 FREE_C_HEAP_ARRAY(char, subset_list);
1230 }
1231
1232 bool Universe::should_verify_subset(uint subset) {
1233 if (verify_flags & subset) {
1234 return true;
1235 }
1236 return false;
1237 }
1238
1239 void Universe::verify(VerifyOption option, const char* prefix) {
1240 COMPILER2_PRESENT(
1241 assert(!DerivedPointerTable::is_active(),
1242 "DPT should not be active during verification "
1243 "(of thread stacks below)");
1244 )
1245
1246 Thread* thread = Thread::current();
1247 ResourceMark rm(thread);
1248 HandleMark hm(thread); // Handles created during verification can be zapped
1249 _verify_count++;
1250
1251 FormatBuffer<> title("Verifying %s", prefix);
1252 GCTraceTime(Info, gc, verify) tm(title.buffer());
1253 if (should_verify_subset(Verify_Threads)) {
1254 log_debug(gc, verify)("Threads");
1255 Threads::verify();
1256 }
1257 if (should_verify_subset(Verify_Heap)) {
1258 log_debug(gc, verify)("Heap");
1259 heap()->verify(option);
1260 }
1261 if (should_verify_subset(Verify_SymbolTable)) {
1262 log_debug(gc, verify)("SymbolTable");
1263 SymbolTable::verify();
1264 }
1265 if (should_verify_subset(Verify_StringTable)) {
1266 log_debug(gc, verify)("StringTable");
1267 StringTable::verify();
1268 }
1269 if (should_verify_subset(Verify_CodeCache)) {
1270 log_debug(gc, verify)("CodeCache");
1271 CodeCache::verify();
1272 }
1273 if (should_verify_subset(Verify_SystemDictionary)) {
1274 log_debug(gc, verify)("SystemDictionary");
1275 SystemDictionary::verify();
1276 }
1277 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1278 log_debug(gc, verify)("ClassLoaderDataGraph");
1279 ClassLoaderDataGraph::verify();
1280 }
1281 if (should_verify_subset(Verify_MetaspaceUtils)) {
1282 log_debug(gc, verify)("MetaspaceUtils");
1283 DEBUG_ONLY(MetaspaceUtils::verify();)
1284 }
1285 if (should_verify_subset(Verify_JNIHandles)) {
1286 log_debug(gc, verify)("JNIHandles");
1287 JNIHandles::verify();
1288 }
1289 if (should_verify_subset(Verify_CodeCacheOops)) {
1290 log_debug(gc, verify)("CodeCache Oops");
1291 CodeCache::verify_oops();
1292 }
1293 if (should_verify_subset(Verify_ResolvedMethodTable)) {
1294 log_debug(gc, verify)("ResolvedMethodTable Oops");
1295 ResolvedMethodTable::verify();
1296 }
1297 if (should_verify_subset(Verify_StringDedup)) {
1298 log_debug(gc, verify)("String Deduplication");
1299 StringDedup::verify();
1300 }
1301 }
1302
1303
1304 #ifndef PRODUCT
1305 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1306 assert(low_boundary < high_boundary, "bad interval");
1307
1308 // decide which low-order bits we require to be clear:
1309 size_t alignSize = MinObjAlignmentInBytes;
1310 size_t min_object_size = CollectedHeap::min_fill_size();
1311
1312 // make an inclusive limit:
1313 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1314 uintptr_t min = (uintptr_t)low_boundary;
1315 assert(min < max, "bad interval");
1316 uintptr_t diff = max ^ min;
1317
1318 // throw away enough low-order bits to make the diff vanish
1319 uintptr_t mask = (uintptr_t)(-1);
1320 while ((mask & diff) != 0)
1321 mask <<= 1;
1322 uintptr_t bits = (min & mask);
1323 assert(bits == (max & mask), "correct mask");
1324 // check an intermediate value between min and max, just to make sure:
1325 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1326
1327 // require address alignment, too:
1328 mask |= (alignSize - 1);
1329
1330 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1331 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1332 }
1333 _verify_oop_mask = mask;
1334 _verify_oop_bits = bits;
1335 }
1336
1337 void Universe::set_verify_data(uintptr_t mask, uintptr_t bits) {
1338 _verify_oop_mask = mask;
1339 _verify_oop_bits = bits;
1340 }
1341
1342 // Oop verification (see MacroAssembler::verify_oop)
1343
1344 uintptr_t Universe::verify_oop_mask() {
1345 return _verify_oop_mask;
1346 }
1347
1348 uintptr_t Universe::verify_oop_bits() {
1349 return _verify_oop_bits;
1350 }
1351
1352 uintptr_t Universe::verify_mark_mask() {
1353 return markWord::lock_mask_in_place;
1354 }
1355
1356 uintptr_t Universe::verify_mark_bits() {
1357 intptr_t mask = verify_mark_mask();
1358 intptr_t bits = (intptr_t)markWord::prototype().value();
1359 assert((bits & ~mask) == 0, "no stray header bits");
1360 return bits;
1361 }
1362 #endif // PRODUCT
1363
1364 #ifdef ASSERT
1365 // Release dummy object(s) at bottom of heap
1366 bool Universe::release_fullgc_alot_dummy() {
1367 MutexLocker ml(FullGCALot_lock);
1368 objArrayOop fullgc_alot_dummy_array = (objArrayOop)_fullgc_alot_dummy_array.resolve();
1369 if (fullgc_alot_dummy_array != nullptr) {
1370 if (_fullgc_alot_dummy_next >= fullgc_alot_dummy_array->length()) {
1371 // No more dummies to release, release entire array instead
1372 _fullgc_alot_dummy_array.release(Universe::vm_global());
1373 _fullgc_alot_dummy_array = OopHandle(); // null out OopStorage pointer.
1374 return false;
1375 }
1376
1377 // Release dummy at bottom of old generation
1378 fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, nullptr);
1379 }
1380 return true;
1381 }
1382
1383 bool Universe::is_stw_gc_active() {
1384 return heap()->is_stw_gc_active();
1385 }
1386
1387 bool Universe::is_in_heap(const void* p) {
1388 return heap()->is_in(p);
1389 }
1390
1391 #endif // ASSERT