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