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 static LatestMethodCache _is_substitutable_cache; // ValueObjectMethods.isSubstitutable()
114 static LatestMethodCache _value_object_hash_code_cache; // ValueObjectMethods.valueObjectHashCode()
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
458 } else
459 #endif
460 {
461 // Set up shared interfaces array. (Do this before supers are set up.)
462 _the_array_interfaces_array->at_put(0, vmClasses::Cloneable_klass());
463 _the_array_interfaces_array->at_put(1, vmClasses::Serializable_klass());
464 }
465
466 _the_array_interfaces_bitmap = Klass::compute_secondary_supers_bitmap(_the_array_interfaces_array);
467 _the_empty_klass_bitmap = Klass::compute_secondary_supers_bitmap(_the_empty_klass_array);
468
469 initialize_basic_type_klass(_fillerArrayKlass, CHECK);
470
471 initialize_basic_type_klass(boolArrayKlass(), CHECK);
472 initialize_basic_type_klass(charArrayKlass(), CHECK);
473 initialize_basic_type_klass(floatArrayKlass(), CHECK);
474 initialize_basic_type_klass(doubleArrayKlass(), CHECK);
475 initialize_basic_type_klass(byteArrayKlass(), CHECK);
476 initialize_basic_type_klass(shortArrayKlass(), CHECK);
477 initialize_basic_type_klass(intArrayKlass(), CHECK);
478 initialize_basic_type_klass(longArrayKlass(), CHECK);
479
480 assert(_fillerArrayKlass != intArrayKlass(),
481 "Internal filler array klass should be different to int array Klass");
482 } // end of core bootstrapping
483
484 {
485 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
486 _the_null_sentinel = OopHandle(vm_global(), tns());
487 }
488
489 // Create a handle for reference_pending_list
490 _reference_pending_list = OopHandle(vm_global(), nullptr);
491
492 // Maybe this could be lifted up now that object array can be initialized
493 // during the bootstrapping.
494
495 // OLD
496 // Initialize _objectArrayKlass after core bootstraping to make
497 // sure the super class is set up properly for _objectArrayKlass.
498 // ---
499 // NEW
500 // Since some of the old system object arrays have been converted to
501 // ordinary object arrays, _objectArrayKlass will be loaded when
502 // SystemDictionary::initialize(CHECK); is run. See the extra check
503 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
504 {
505 Klass* oak = vmClasses::Object_klass()->array_klass(CHECK);
506 _objectArrayKlass = ObjArrayKlass::cast(oak);
507 }
508 // OLD
509 // Add the class to the class hierarchy manually to make sure that
510 // its vtable is initialized after core bootstrapping is completed.
511 // ---
512 // New
513 // Have already been initialized.
514 _objectArrayKlass->append_to_sibling_list();
515
516 #ifdef ASSERT
517 if (FullGCALot) {
518 // Allocate an array of dummy objects.
519 // We'd like these to be at the bottom of the old generation,
520 // so that when we free one and then collect,
521 // (almost) the whole heap moves
522 // and we find out if we actually update all the oops correctly.
523 // But we can't allocate directly in the old generation,
524 // so we allocate wherever, and hope that the first collection
525 // moves these objects to the bottom of the old generation.
526 int size = FullGCALotDummies * 2;
527
528 objArrayOop naked_array = oopFactory::new_objArray(vmClasses::Object_klass(), size, CHECK);
529 objArrayHandle dummy_array(THREAD, naked_array);
530 int i = 0;
531 while (i < size) {
532 // Allocate dummy in old generation
533 oop dummy = vmClasses::Object_klass()->allocate_instance(CHECK);
534 dummy_array->obj_at_put(i++, dummy);
535 }
536 {
537 // Only modify the global variable inside the mutex.
538 // If we had a race to here, the other dummy_array instances
539 // and their elements just get dropped on the floor, which is fine.
540 MutexLocker ml(THREAD, FullGCALot_lock);
541 if (_fullgc_alot_dummy_array.is_empty()) {
542 _fullgc_alot_dummy_array = OopHandle(vm_global(), dummy_array());
543 }
544 }
545 assert(i == ((objArrayOop)_fullgc_alot_dummy_array.resolve())->length(), "just checking");
546 }
547 #endif
548 }
549
550 void Universe::initialize_basic_type_mirrors(TRAPS) {
551 #if INCLUDE_CDS_JAVA_HEAP
552 if (CDSConfig::is_using_archive() &&
553 ArchiveHeapLoader::is_in_use() &&
554 _basic_type_mirrors[T_INT].resolve() != nullptr) {
555 assert(ArchiveHeapLoader::can_use(), "Sanity");
556
557 // check that all basic type mirrors are mapped also
558 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
559 if (!is_reference_type((BasicType)i)) {
560 oop m = _basic_type_mirrors[i].resolve();
561 assert(m != nullptr, "archived mirrors should not be null");
562 }
563 }
564 } else
565 // _basic_type_mirrors[T_INT], etc, are null if archived heap is not mapped.
566 #endif
567 {
568 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
569 BasicType bt = (BasicType)i;
570 if (!is_reference_type(bt)) {
571 oop m = java_lang_Class::create_basic_type_mirror(type2name(bt), bt, CHECK);
572 _basic_type_mirrors[i] = OopHandle(vm_global(), m);
573 }
574 CDS_JAVA_HEAP_ONLY(_archived_basic_type_mirror_indices[i] = -1);
575 }
576 }
577 if (CDSConfig::is_dumping_heap()) {
578 HeapShared::init_scratch_objects_for_basic_type_mirrors(CHECK);
579 }
580 }
581
582 void Universe::fixup_mirrors(TRAPS) {
583 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
584 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
585 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
586 // that the number of objects allocated at this point is very small.
587 assert(vmClasses::Class_klass_loaded(), "java.lang.Class should be loaded");
588 HandleMark hm(THREAD);
589
590 if (!CDSConfig::is_using_archive()) {
591 // Cache the start of the static fields
592 InstanceMirrorKlass::init_offset_of_static_fields();
593 }
594
595 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
596 int list_length = list->length();
597 for (int i = 0; i < list_length; i++) {
598 Klass* k = list->at(i);
599 assert(k->is_klass(), "List should only hold classes");
600 java_lang_Class::fixup_mirror(k, CATCH);
601 }
602 delete java_lang_Class::fixup_mirror_list();
603 java_lang_Class::set_fixup_mirror_list(nullptr);
604 }
605
606 #define assert_pll_locked(test) \
607 assert(Heap_lock->test(), "Reference pending list access requires lock")
608
609 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
610
611 oop Universe::reference_pending_list() {
612 if (Thread::current()->is_VM_thread()) {
613 assert_pll_locked(is_locked);
614 } else {
615 assert_pll_ownership();
616 }
617 return _reference_pending_list.resolve();
618 }
619
620 void Universe::clear_reference_pending_list() {
621 assert_pll_ownership();
622 _reference_pending_list.replace(nullptr);
623 }
624
625 bool Universe::has_reference_pending_list() {
626 assert_pll_ownership();
627 return _reference_pending_list.peek() != nullptr;
628 }
629
630 oop Universe::swap_reference_pending_list(oop list) {
631 assert_pll_locked(is_locked);
632 return _reference_pending_list.xchg(list);
633 }
634
635 #undef assert_pll_locked
636 #undef assert_pll_ownership
637
638 static void reinitialize_vtables() {
639 // The vtables are initialized by starting at java.lang.Object and
640 // initializing through the subclass links, so that the super
641 // classes are always initialized first.
642 for (ClassHierarchyIterator iter(vmClasses::Object_klass()); !iter.done(); iter.next()) {
643 Klass* sub = iter.klass();
644 sub->vtable().initialize_vtable();
645 }
646 }
647
648 static void reinitialize_itables() {
649
650 class ReinitTableClosure : public KlassClosure {
651 public:
652 void do_klass(Klass* k) {
653 if (k->is_instance_klass()) {
654 InstanceKlass::cast(k)->itable().initialize_itable();
655 }
656 }
657 };
658
659 MutexLocker mcld(ClassLoaderDataGraph_lock);
660 ReinitTableClosure cl;
661 ClassLoaderDataGraph::classes_do(&cl);
662 }
663
664 bool Universe::on_page_boundary(void* addr) {
665 return is_aligned(addr, os::vm_page_size());
666 }
667
668 // the array of preallocated errors with backtraces
669 objArrayOop Universe::preallocated_out_of_memory_errors() {
670 return (objArrayOop)_preallocated_out_of_memory_error_array.resolve();
671 }
672
673 objArrayOop Universe::out_of_memory_errors() { return (objArrayOop)_out_of_memory_errors.resolve(); }
674
675 oop Universe::out_of_memory_error_java_heap() {
676 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_java_heap));
677 }
678
679 oop Universe::out_of_memory_error_java_heap_without_backtrace() {
680 return out_of_memory_errors()->obj_at(_oom_java_heap);
681 }
682
683 oop Universe::out_of_memory_error_c_heap() {
684 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_c_heap));
685 }
686
687 oop Universe::out_of_memory_error_metaspace() {
688 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_metaspace));
689 }
690
691 oop Universe::out_of_memory_error_class_metaspace() {
692 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_class_metaspace));
693 }
694
695 oop Universe::out_of_memory_error_array_size() {
696 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_array_size));
697 }
698
699 oop Universe::out_of_memory_error_gc_overhead_limit() {
700 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_gc_overhead_limit));
701 }
702
703 oop Universe::out_of_memory_error_realloc_objects() {
704 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_realloc_objects));
705 }
706
707 oop Universe::class_init_out_of_memory_error() { return out_of_memory_errors()->obj_at(_oom_java_heap); }
708 oop Universe::class_init_stack_overflow_error() { return _class_init_stack_overflow_error.resolve(); }
709 oop Universe::delayed_stack_overflow_error_message() { return _delayed_stack_overflow_error_message.resolve(); }
710
711
712 bool Universe::should_fill_in_stack_trace(Handle throwable) {
713 // never attempt to fill in the stack trace of preallocated errors that do not have
714 // backtrace. These errors are kept alive forever and may be "re-used" when all
715 // preallocated errors with backtrace have been consumed. Also need to avoid
716 // a potential loop which could happen if an out of memory occurs when attempting
717 // to allocate the backtrace.
718 objArrayOop preallocated_oom = out_of_memory_errors();
719 for (int i = 0; i < _oom_count; i++) {
720 if (throwable() == preallocated_oom->obj_at(i)) {
721 return false;
722 }
723 }
724 return true;
725 }
726
727
728 oop Universe::gen_out_of_memory_error(oop default_err) {
729 // generate an out of memory error:
730 // - if there is a preallocated error and stack traces are available
731 // (j.l.Throwable is initialized), then return the preallocated
732 // error with a filled in stack trace, and with the message
733 // provided by the default error.
734 // - otherwise, return the default error, without a stack trace.
735 int next;
736 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
737 vmClasses::Throwable_klass()->is_initialized()) {
738 next = (int)Atomic::add(&_preallocated_out_of_memory_error_avail_count, -1);
739 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
740 } else {
741 next = -1;
742 }
743 if (next < 0) {
744 // all preallocated errors have been used.
745 // return default
746 return default_err;
747 } else {
748 JavaThread* current = JavaThread::current();
749 Handle default_err_h(current, default_err);
750 // get the error object at the slot and set set it to null so that the
751 // array isn't keeping it alive anymore.
752 Handle exc(current, preallocated_out_of_memory_errors()->obj_at(next));
753 assert(exc() != nullptr, "slot has been used already");
754 preallocated_out_of_memory_errors()->obj_at_put(next, nullptr);
755
756 // use the message from the default error
757 oop msg = java_lang_Throwable::message(default_err_h());
758 assert(msg != nullptr, "no message");
759 java_lang_Throwable::set_message(exc(), msg);
760
761 // populate the stack trace and return it.
762 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
763 return exc();
764 }
765 }
766
767 bool Universe::is_out_of_memory_error_metaspace(oop ex_obj) {
768 return java_lang_Throwable::message(ex_obj) == _msg_metaspace.resolve();
769 }
770
771 bool Universe::is_out_of_memory_error_class_metaspace(oop ex_obj) {
772 return java_lang_Throwable::message(ex_obj) == _msg_class_metaspace.resolve();
773 }
774
775 // Setup preallocated OutOfMemoryError errors
776 void Universe::create_preallocated_out_of_memory_errors(TRAPS) {
777 InstanceKlass* ik = vmClasses::OutOfMemoryError_klass();
778 objArrayOop oa = oopFactory::new_objArray(ik, _oom_count, CHECK);
779 objArrayHandle oom_array(THREAD, oa);
780
781 for (int i = 0; i < _oom_count; i++) {
782 oop oom_obj = ik->allocate_instance(CHECK);
783 oom_array->obj_at_put(i, oom_obj);
784 }
785 _out_of_memory_errors = OopHandle(vm_global(), oom_array());
786
787 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK);
788 java_lang_Throwable::set_message(oom_array->obj_at(_oom_java_heap), msg());
789
790 msg = java_lang_String::create_from_str("C heap space", CHECK);
791 java_lang_Throwable::set_message(oom_array->obj_at(_oom_c_heap), msg());
792
793 msg = java_lang_String::create_from_str("Metaspace", CHECK);
794 _msg_metaspace = OopHandle(vm_global(), msg());
795 java_lang_Throwable::set_message(oom_array->obj_at(_oom_metaspace), msg());
796
797 msg = java_lang_String::create_from_str("Compressed class space", CHECK);
798 _msg_class_metaspace = OopHandle(vm_global(), msg());
799 java_lang_Throwable::set_message(oom_array->obj_at(_oom_class_metaspace), msg());
800
801 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK);
802 java_lang_Throwable::set_message(oom_array->obj_at(_oom_array_size), msg());
803
804 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK);
805 java_lang_Throwable::set_message(oom_array->obj_at(_oom_gc_overhead_limit), msg());
806
807 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK);
808 java_lang_Throwable::set_message(oom_array->obj_at(_oom_realloc_objects), msg());
809
810 // Setup the array of errors that have preallocated backtrace
811 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
812 objArrayOop instance = oopFactory::new_objArray(ik, len, CHECK);
813 _preallocated_out_of_memory_error_array = OopHandle(vm_global(), instance);
814 objArrayHandle preallocated_oom_array(THREAD, instance);
815
816 for (int i=0; i<len; i++) {
817 oop err = ik->allocate_instance(CHECK);
818 Handle err_h(THREAD, err);
819 java_lang_Throwable::allocate_backtrace(err_h, CHECK);
820 preallocated_oom_array->obj_at_put(i, err_h());
821 }
822 _preallocated_out_of_memory_error_avail_count = (jint)len;
823 }
824
825 intptr_t Universe::_non_oop_bits = 0;
826
827 void* Universe::non_oop_word() {
828 // Neither the high bits nor the low bits of this value is allowed
829 // to look like (respectively) the high or low bits of a real oop.
830 //
831 // High and low are CPU-specific notions, but low always includes
832 // the low-order bit. Since oops are always aligned at least mod 4,
833 // setting the low-order bit will ensure that the low half of the
834 // word will never look like that of a real oop.
835 //
836 // Using the OS-supplied non-memory-address word (usually 0 or -1)
837 // will take care of the high bits, however many there are.
838
839 if (_non_oop_bits == 0) {
840 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
841 }
842
843 return (void*)_non_oop_bits;
844 }
845
846 bool Universe::contains_non_oop_word(void* p) {
847 return *(void**)p == non_oop_word();
848 }
849
850 static void initialize_global_behaviours() {
851 DefaultICProtectionBehaviour* protection_behavior = new DefaultICProtectionBehaviour();
852 // Ignore leak of DefaultICProtectionBehaviour. It is overriden by some GC implementations and the
853 // pointer is leaked once.
854 LSAN_IGNORE_OBJECT(protection_behavior);
855 CompiledICProtectionBehaviour::set_current(protection_behavior);
856 }
857
858 jint universe_init() {
859 assert(!Universe::_fully_initialized, "called after initialize_vtables");
860 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
861 "LogHeapWordSize is incorrect.");
862 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
863 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
864 "oop size is not not a multiple of HeapWord size");
865
866 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
867
868 initialize_global_behaviours();
869
870 GCLogPrecious::initialize();
871
872 // Initialize CPUTimeCounters object, which must be done before creation of the heap.
873 CPUTimeCounters::initialize();
874
875 ObjLayout::initialize();
876
877 #ifdef _LP64
878 MetaspaceShared::adjust_heap_sizes_for_dumping();
879 #endif // _LP64
880
881 GCConfig::arguments()->initialize_heap_sizes();
882
883 jint status = Universe::initialize_heap();
884 if (status != JNI_OK) {
885 return status;
886 }
887
888 Universe::initialize_tlab();
889
890 Metaspace::global_initialize();
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 if (CDSConfig::is_using_archive()) {
903 // Read the data structures supporting the shared spaces (shared
904 // system dictionary, symbol table, etc.)
905 MetaspaceShared::initialize_shared_spaces();
906 }
907 if (CDSConfig::is_dumping_archive()) {
908 CDSConfig::prepare_for_dumping();
909 }
910 #endif
911
912 SymbolTable::create_table();
913 StringTable::create_table();
914
915 if (strlen(VerifySubSet) > 0) {
916 Universe::initialize_verify_flags();
917 }
918
919 ResolvedMethodTable::create_table();
920
921 return JNI_OK;
922 }
923
924 jint Universe::initialize_heap() {
925 assert(_collectedHeap == nullptr, "Heap already created");
926 _collectedHeap = GCConfig::arguments()->create_heap();
927
928 log_info(gc)("Using %s", _collectedHeap->name());
929 return _collectedHeap->initialize();
930 }
931
932 void Universe::initialize_tlab() {
933 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
934 PLAB::startup_initialization();
935 if (UseTLAB) {
936 ThreadLocalAllocBuffer::startup_initialization();
937 }
938 }
939
940 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
941
942 assert(alignment <= Arguments::conservative_max_heap_alignment(),
943 "actual alignment %zu must be within maximum heap alignment %zu",
944 alignment, Arguments::conservative_max_heap_alignment());
945
946 size_t total_reserved = align_up(heap_size, alignment);
947 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
948 "heap size is too big for compressed oops");
949
950 size_t page_size = os::vm_page_size();
951 if (UseLargePages && is_aligned(alignment, os::large_page_size())) {
952 page_size = os::large_page_size();
953 } else {
954 // Parallel is the only collector that might opt out of using large pages
955 // for the heap.
956 assert(!UseLargePages || UseParallelGC , "Wrong alignment to use large pages");
957 }
958
959 // Now create the space.
960 ReservedHeapSpace rhs = HeapReserver::reserve(total_reserved, alignment, page_size, AllocateHeapAt);
961
962 if (!rhs.is_reserved()) {
963 vm_exit_during_initialization(
964 err_msg("Could not reserve enough space for %zu KB object heap",
965 total_reserved/K));
966 }
967
968 assert(total_reserved == rhs.size(), "must be exactly of required size");
969 assert(is_aligned(rhs.base(),alignment),"must be exactly of required alignment");
970
971 assert(markWord::encode_pointer_as_mark(rhs.base()).decode_pointer() == rhs.base(),
972 "area must be distinguishable from marks for mark-sweep");
973 assert(markWord::encode_pointer_as_mark(&rhs.base()[rhs.size()]).decode_pointer() ==
974 &rhs.base()[rhs.size()],
975 "area must be distinguishable from marks for mark-sweep");
976
977 // We are good.
978
979 if (AllocateHeapAt != nullptr) {
980 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
981 }
982
983 if (UseCompressedOops) {
984 CompressedOops::initialize(rhs);
985 }
986
987 Universe::calculate_verify_data((HeapWord*)rhs.base(), (HeapWord*)rhs.end());
988
989 return rhs;
990 }
991
992 OopStorage* Universe::vm_weak() {
993 return Universe::_vm_weak;
994 }
995
996 OopStorage* Universe::vm_global() {
997 return Universe::_vm_global;
998 }
999
1000 void Universe::oopstorage_init() {
1001 Universe::_vm_global = OopStorageSet::create_strong("VM Global", mtInternal);
1002 Universe::_vm_weak = OopStorageSet::create_weak("VM Weak", mtInternal);
1003 }
1004
1005 void universe_oopstorage_init() {
1006 Universe::oopstorage_init();
1007 }
1008
1009 void LatestMethodCache::init(JavaThread* current, InstanceKlass* ik,
1010 const char* method, Symbol* signature, bool is_static)
1011 {
1012 TempNewSymbol name = SymbolTable::new_symbol(method);
1013 Method* m = nullptr;
1014 // The klass must be linked before looking up the method.
1015 if (!ik->link_class_or_fail(current) ||
1016 ((m = ik->find_method(name, signature)) == nullptr) ||
1017 is_static != m->is_static()) {
1018 ResourceMark rm(current);
1019 // NoSuchMethodException doesn't actually work because it tries to run the
1020 // <init> function before java_lang_Class is linked. Print error and exit.
1021 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
1022 ik->name()->as_C_string(), method));
1023 }
1024
1025 _klass = ik;
1026 _method_idnum = m->method_idnum();
1027 assert(_method_idnum >= 0, "sanity check");
1028 }
1029
1030 Method* LatestMethodCache::get_method() {
1031 if (_klass == nullptr) {
1032 return nullptr;
1033 } else {
1034 Method* m = _klass->method_with_idnum(_method_idnum);
1035 assert(m != nullptr, "sanity check");
1036 return m;
1037 }
1038 }
1039
1040 Method* Universe::finalizer_register_method() { return _finalizer_register_cache.get_method(); }
1041 Method* Universe::loader_addClass_method() { return _loader_addClass_cache.get_method(); }
1042 Method* Universe::throw_illegal_access_error() { return _throw_illegal_access_error_cache.get_method(); }
1043 Method* Universe::throw_no_such_method_error() { return _throw_no_such_method_error_cache.get_method(); }
1044 Method* Universe::do_stack_walk_method() { return _do_stack_walk_cache.get_method(); }
1045 Method* Universe::is_substitutable_method() { return _is_substitutable_cache.get_method(); }
1046 Method* Universe::value_object_hash_code_method() { return _value_object_hash_code_cache.get_method(); }
1047
1048 void Universe::initialize_known_methods(JavaThread* current) {
1049 // Set up static method for registering finalizers
1050 _finalizer_register_cache.init(current,
1051 vmClasses::Finalizer_klass(),
1052 "register",
1053 vmSymbols::object_void_signature(), true);
1054
1055 _throw_illegal_access_error_cache.init(current,
1056 vmClasses::internal_Unsafe_klass(),
1057 "throwIllegalAccessError",
1058 vmSymbols::void_method_signature(), true);
1059
1060 _throw_no_such_method_error_cache.init(current,
1061 vmClasses::internal_Unsafe_klass(),
1062 "throwNoSuchMethodError",
1063 vmSymbols::void_method_signature(), true);
1064
1065 // Set up method for registering loaded classes in class loader vector
1066 _loader_addClass_cache.init(current,
1067 vmClasses::ClassLoader_klass(),
1068 "addClass",
1069 vmSymbols::class_void_signature(), false);
1070
1071 // Set up method for stack walking
1072 _do_stack_walk_cache.init(current,
1073 vmClasses::AbstractStackWalker_klass(),
1074 "doStackWalk",
1075 vmSymbols::doStackWalk_signature(), false);
1076
1077 // Set up substitutability testing
1078 ResourceMark rm(current);
1079 _is_substitutable_cache.init(current,
1080 vmClasses::ValueObjectMethods_klass(),
1081 vmSymbols::isSubstitutable_name()->as_C_string(),
1082 vmSymbols::object_object_boolean_signature(), true);
1083 _value_object_hash_code_cache.init(current,
1084 vmClasses::ValueObjectMethods_klass(),
1085 vmSymbols::valueObjectHashCode_name()->as_C_string(),
1086 vmSymbols::object_int_signature(), true);
1087 }
1088
1089 void universe2_init() {
1090 EXCEPTION_MARK;
1091 Universe::genesis(CATCH);
1092 }
1093
1094 // Set after initialization of the module runtime, call_initModuleRuntime
1095 void universe_post_module_init() {
1096 Universe::_module_initialized = true;
1097 }
1098
1099 bool universe_post_init() {
1100 assert(!is_init_completed(), "Error: initialization not yet completed!");
1101 Universe::_fully_initialized = true;
1102 EXCEPTION_MARK;
1103 if (!CDSConfig::is_using_archive()) {
1104 reinitialize_vtables();
1105 reinitialize_itables();
1106 }
1107
1108 HandleMark hm(THREAD);
1109 // Setup preallocated empty java.lang.Class array for Method reflection.
1110
1111 objArrayOop the_empty_class_array = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_false);
1112 Universe::_the_empty_class_array = OopHandle(Universe::vm_global(), the_empty_class_array);
1113
1114 // Setup preallocated OutOfMemoryError errors
1115 Universe::create_preallocated_out_of_memory_errors(CHECK_false);
1116
1117 oop instance;
1118 // Setup preallocated cause message for delayed StackOverflowError
1119 if (StackReservedPages > 0) {
1120 instance = java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
1121 Universe::_delayed_stack_overflow_error_message = OopHandle(Universe::vm_global(), instance);
1122 }
1123
1124 // Setup preallocated exceptions used for a cheap & dirty solution in compiler exception handling
1125 _null_ptr_exception.init_if_empty(vmSymbols::java_lang_NullPointerException(), CHECK_false);
1126 _arithmetic_exception.init_if_empty(vmSymbols::java_lang_ArithmeticException(), CHECK_false);
1127 _array_index_out_of_bounds_exception.init_if_empty(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), CHECK_false);
1128 _array_store_exception.init_if_empty(vmSymbols::java_lang_ArrayStoreException(), CHECK_false);
1129 _class_cast_exception.init_if_empty(vmSymbols::java_lang_ClassCastException(), CHECK_false);
1130
1131 // Virtual Machine Error for when we get into a situation we can't resolve
1132 Klass* k = vmClasses::InternalError_klass();
1133 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1134 if (!linked) {
1135 tty->print_cr("Unable to link/verify InternalError class");
1136 return false; // initialization failed
1137 }
1138 _internal_error.init_if_empty(vmSymbols::java_lang_InternalError(), CHECK_false);
1139
1140 Handle msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1141 java_lang_Throwable::set_message(Universe::arithmetic_exception_instance(), msg());
1142
1143 // Setup preallocated StackOverflowError for use with class initialization failure
1144 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_StackOverflowError(), true, CHECK_false);
1145 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1146 Universe::_class_init_stack_overflow_error = OopHandle(Universe::vm_global(), instance);
1147
1148 Universe::initialize_known_methods(THREAD);
1149
1150 // This needs to be done before the first scavenge/gc, since
1151 // it's an input to soft ref clearing policy.
1152 {
1153 MutexLocker x(THREAD, Heap_lock);
1154 Universe::heap()->update_capacity_and_used_at_gc();
1155 }
1156
1157 // ("weak") refs processing infrastructure initialization
1158 Universe::heap()->post_initialize();
1159
1160 MemoryService::add_metaspace_memory_pools();
1161
1162 MemoryService::set_universe_heap(Universe::heap());
1163 #if INCLUDE_CDS
1164 MetaspaceShared::post_initialize(CHECK_false);
1165 #endif
1166 return true;
1167 }
1168
1169
1170 void Universe::compute_base_vtable_size() {
1171 _base_vtable_size = ClassLoader::compute_Object_vtable();
1172 }
1173
1174 void Universe::print_on(outputStream* st) {
1175 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1176 st->print_cr("Heap");
1177
1178 StreamAutoIndentor indentor(st, 1);
1179 heap()->print_heap_on(st);
1180 MetaspaceUtils::print_on(st);
1181 }
1182
1183 void Universe::print_heap_at_SIGBREAK() {
1184 if (PrintHeapAtSIGBREAK) {
1185 print_on(tty);
1186 tty->cr();
1187 tty->flush();
1188 }
1189 }
1190
1191 void Universe::initialize_verify_flags() {
1192 verify_flags = 0;
1193 const char delimiter[] = " ,";
1194
1195 size_t length = strlen(VerifySubSet);
1196 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1197 strncpy(subset_list, VerifySubSet, length + 1);
1198 char* save_ptr;
1199
1200 char* token = strtok_r(subset_list, delimiter, &save_ptr);
1201 while (token != nullptr) {
1202 if (strcmp(token, "threads") == 0) {
1203 verify_flags |= Verify_Threads;
1204 } else if (strcmp(token, "heap") == 0) {
1205 verify_flags |= Verify_Heap;
1206 } else if (strcmp(token, "symbol_table") == 0) {
1207 verify_flags |= Verify_SymbolTable;
1208 } else if (strcmp(token, "string_table") == 0) {
1209 verify_flags |= Verify_StringTable;
1210 } else if (strcmp(token, "codecache") == 0) {
1211 verify_flags |= Verify_CodeCache;
1212 } else if (strcmp(token, "dictionary") == 0) {
1213 verify_flags |= Verify_SystemDictionary;
1214 } else if (strcmp(token, "classloader_data_graph") == 0) {
1215 verify_flags |= Verify_ClassLoaderDataGraph;
1216 } else if (strcmp(token, "metaspace") == 0) {
1217 verify_flags |= Verify_MetaspaceUtils;
1218 } else if (strcmp(token, "jni_handles") == 0) {
1219 verify_flags |= Verify_JNIHandles;
1220 } else if (strcmp(token, "codecache_oops") == 0) {
1221 verify_flags |= Verify_CodeCacheOops;
1222 } else if (strcmp(token, "resolved_method_table") == 0) {
1223 verify_flags |= Verify_ResolvedMethodTable;
1224 } else if (strcmp(token, "stringdedup") == 0) {
1225 verify_flags |= Verify_StringDedup;
1226 } else {
1227 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1228 }
1229 token = strtok_r(nullptr, delimiter, &save_ptr);
1230 }
1231 FREE_C_HEAP_ARRAY(char, subset_list);
1232 }
1233
1234 bool Universe::should_verify_subset(uint subset) {
1235 if (verify_flags & subset) {
1236 return true;
1237 }
1238 return false;
1239 }
1240
1241 void Universe::verify(VerifyOption option, const char* prefix) {
1242 COMPILER2_PRESENT(
1243 assert(!DerivedPointerTable::is_active(),
1244 "DPT should not be active during verification "
1245 "(of thread stacks below)");
1246 )
1247
1248 Thread* thread = Thread::current();
1249 ResourceMark rm(thread);
1250 HandleMark hm(thread); // Handles created during verification can be zapped
1251 _verify_count++;
1252
1253 FormatBuffer<> title("Verifying %s", prefix);
1254 GCTraceTime(Info, gc, verify) tm(title.buffer());
1255 if (should_verify_subset(Verify_Threads)) {
1256 log_debug(gc, verify)("Threads");
1257 Threads::verify();
1258 }
1259 if (should_verify_subset(Verify_Heap)) {
1260 log_debug(gc, verify)("Heap");
1261 heap()->verify(option);
1262 }
1263 if (should_verify_subset(Verify_SymbolTable)) {
1264 log_debug(gc, verify)("SymbolTable");
1265 SymbolTable::verify();
1266 }
1267 if (should_verify_subset(Verify_StringTable)) {
1268 log_debug(gc, verify)("StringTable");
1269 StringTable::verify();
1270 }
1271 if (should_verify_subset(Verify_CodeCache)) {
1272 log_debug(gc, verify)("CodeCache");
1273 CodeCache::verify();
1274 }
1275 if (should_verify_subset(Verify_SystemDictionary)) {
1276 log_debug(gc, verify)("SystemDictionary");
1277 SystemDictionary::verify();
1278 }
1279 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1280 log_debug(gc, verify)("ClassLoaderDataGraph");
1281 ClassLoaderDataGraph::verify();
1282 }
1283 if (should_verify_subset(Verify_MetaspaceUtils)) {
1284 log_debug(gc, verify)("MetaspaceUtils");
1285 DEBUG_ONLY(MetaspaceUtils::verify();)
1286 }
1287 if (should_verify_subset(Verify_JNIHandles)) {
1288 log_debug(gc, verify)("JNIHandles");
1289 JNIHandles::verify();
1290 }
1291 if (should_verify_subset(Verify_CodeCacheOops)) {
1292 log_debug(gc, verify)("CodeCache Oops");
1293 CodeCache::verify_oops();
1294 }
1295 if (should_verify_subset(Verify_ResolvedMethodTable)) {
1296 log_debug(gc, verify)("ResolvedMethodTable Oops");
1297 ResolvedMethodTable::verify();
1298 }
1299 if (should_verify_subset(Verify_StringDedup)) {
1300 log_debug(gc, verify)("String Deduplication");
1301 StringDedup::verify();
1302 }
1303 }
1304
1305
1306 #ifndef PRODUCT
1307 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1308 assert(low_boundary < high_boundary, "bad interval");
1309
1310 // decide which low-order bits we require to be clear:
1311 size_t alignSize = MinObjAlignmentInBytes;
1312 size_t min_object_size = CollectedHeap::min_fill_size();
1313
1314 // make an inclusive limit:
1315 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1316 uintptr_t min = (uintptr_t)low_boundary;
1317 assert(min < max, "bad interval");
1318 uintptr_t diff = max ^ min;
1319
1320 // throw away enough low-order bits to make the diff vanish
1321 uintptr_t mask = (uintptr_t)(-1);
1322 while ((mask & diff) != 0)
1323 mask <<= 1;
1324 uintptr_t bits = (min & mask);
1325 assert(bits == (max & mask), "correct mask");
1326 // check an intermediate value between min and max, just to make sure:
1327 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1328
1329 // require address alignment, too:
1330 mask |= (alignSize - 1);
1331
1332 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1333 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1334 }
1335 _verify_oop_mask = mask;
1336 _verify_oop_bits = bits;
1337 }
1338
1339 void Universe::set_verify_data(uintptr_t mask, uintptr_t bits) {
1340 _verify_oop_mask = mask;
1341 _verify_oop_bits = bits;
1342 }
1343
1344 // Oop verification (see MacroAssembler::verify_oop)
1345
1346 uintptr_t Universe::verify_oop_mask() {
1347 return _verify_oop_mask;
1348 }
1349
1350 uintptr_t Universe::verify_oop_bits() {
1351 return _verify_oop_bits;
1352 }
1353
1354 uintptr_t Universe::verify_mark_mask() {
1355 return markWord::lock_mask_in_place;
1356 }
1357
1358 uintptr_t Universe::verify_mark_bits() {
1359 intptr_t mask = verify_mark_mask();
1360 intptr_t bits = (intptr_t)markWord::prototype().value();
1361 assert((bits & ~mask) == 0, "no stray header bits");
1362 return bits;
1363 }
1364 #endif // PRODUCT
1365
1366 #ifdef ASSERT
1367 // Release dummy object(s) at bottom of heap
1368 bool Universe::release_fullgc_alot_dummy() {
1369 MutexLocker ml(FullGCALot_lock);
1370 objArrayOop fullgc_alot_dummy_array = (objArrayOop)_fullgc_alot_dummy_array.resolve();
1371 if (fullgc_alot_dummy_array != nullptr) {
1372 if (_fullgc_alot_dummy_next >= fullgc_alot_dummy_array->length()) {
1373 // No more dummies to release, release entire array instead
1374 _fullgc_alot_dummy_array.release(Universe::vm_global());
1375 _fullgc_alot_dummy_array = OopHandle(); // null out OopStorage pointer.
1376 return false;
1377 }
1378
1379 // Release dummy at bottom of old generation
1380 fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, nullptr);
1381 }
1382 return true;
1383 }
1384
1385 bool Universe::is_stw_gc_active() {
1386 return heap()->is_stw_gc_active();
1387 }
1388
1389 bool Universe::is_in_heap(const void* p) {
1390 return heap()->is_in(p);
1391 }
1392
1393 #endif // ASSERT