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