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