1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/archiveHeapLoader.hpp"
26 #include "cds/cdsConfig.hpp"
27 #include "cds/dynamicArchive.hpp"
28 #include "cds/heapShared.hpp"
29 #include "cds/metaspaceShared.hpp"
30 #include "classfile/classLoader.hpp"
31 #include "classfile/classLoaderDataGraph.hpp"
32 #include "classfile/classLoaderDataShared.hpp"
33 #include "classfile/javaClasses.hpp"
34 #include "classfile/stringTable.hpp"
35 #include "classfile/symbolTable.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/vmClasses.hpp"
38 #include "classfile/vmSymbols.hpp"
39 #include "code/codeBehaviours.hpp"
40 #include "code/codeCache.hpp"
41 #include "compiler/oopMap.hpp"
42 #include "gc/shared/collectedHeap.inline.hpp"
43 #include "gc/shared/gcArguments.hpp"
44 #include "gc/shared/gcConfig.hpp"
45 #include "gc/shared/gcLogPrecious.hpp"
46 #include "gc/shared/gcTraceTime.inline.hpp"
47 #include "gc/shared/oopStorageSet.hpp"
48 #include "gc/shared/plab.hpp"
49 #include "gc/shared/stringdedup/stringDedup.hpp"
50 #include "gc/shared/tlab_globals.hpp"
51 #include "logging/log.hpp"
52 #include "logging/logStream.hpp"
53 #include "memory/memoryReserver.hpp"
54 #include "memory/metadataFactory.hpp"
55 #include "memory/metaspaceClosure.hpp"
56 #include "memory/metaspaceCounters.hpp"
57 #include "memory/metaspaceUtils.hpp"
58 #include "memory/oopFactory.hpp"
59 #include "memory/resourceArea.hpp"
60 #include "memory/universe.hpp"
61 #include "oops/compressedOops.hpp"
62 #include "oops/instanceKlass.hpp"
63 #include "oops/instanceMirrorKlass.hpp"
64 #include "oops/jmethodIDTable.hpp"
65 #include "oops/klass.inline.hpp"
66 #include "oops/objArrayOop.inline.hpp"
67 #include "oops/objLayout.hpp"
68 #include "oops/oop.inline.hpp"
69 #include "oops/oopHandle.inline.hpp"
70 #include "oops/refArrayKlass.hpp"
71 #include "oops/typeArrayKlass.hpp"
72 #include "prims/resolvedMethodTable.hpp"
73 #include "runtime/arguments.hpp"
74 #include "runtime/atomic.hpp"
75 #include "runtime/cpuTimeCounters.hpp"
76 #include "runtime/flags/jvmFlagLimit.hpp"
77 #include "runtime/handles.inline.hpp"
78 #include "runtime/init.hpp"
79 #include "runtime/java.hpp"
80 #include "runtime/javaThread.hpp"
81 #include "runtime/jniHandles.hpp"
82 #include "runtime/threads.hpp"
83 #include "runtime/timerTrace.hpp"
84 #include "sanitizers/leak.hpp"
85 #include "services/memoryService.hpp"
86 #include "utilities/align.hpp"
87 #include "utilities/autoRestore.hpp"
88 #include "utilities/debug.hpp"
89 #include "utilities/formatBuffer.hpp"
90 #include "utilities/macros.hpp"
91 #include "utilities/ostream.hpp"
92 #include "utilities/preserveException.hpp"
93
94 // A helper class for caching a Method* when the user of the cache
95 // only cares about the latest version of the Method*. This cache safely
96 // interacts with the RedefineClasses API.
97 class LatestMethodCache {
98 // We save the InstanceKlass* and the idnum of Method* in order to get
99 // the current Method*.
100 InstanceKlass* _klass;
101 int _method_idnum;
102
103 public:
104 LatestMethodCache() { _klass = nullptr; _method_idnum = -1; }
105
106 void init(JavaThread* current, InstanceKlass* ik, const char* method,
107 Symbol* signature, bool is_static);
108 Method* get_method();
109 };
110
111 static LatestMethodCache _finalizer_register_cache; // Finalizer.register()
112 static LatestMethodCache _loader_addClass_cache; // ClassLoader.addClass()
113 static LatestMethodCache _throw_illegal_access_error_cache; // Unsafe.throwIllegalAccessError()
114 static LatestMethodCache _throw_no_such_method_error_cache; // Unsafe.throwNoSuchMethodError()
115 static LatestMethodCache _do_stack_walk_cache; // AbstractStackWalker.doStackWalk()
116 static LatestMethodCache _is_substitutable_cache; // ValueObjectMethods.isSubstitutable()
117 static LatestMethodCache _value_object_hash_code_cache; // ValueObjectMethods.valueObjectHashCode()
118
119 // Known objects
120 TypeArrayKlass* Universe::_typeArrayKlasses[T_LONG+1] = { nullptr /*, nullptr...*/ };
121 ObjArrayKlass* Universe::_objectArrayKlass = nullptr;
122 Klass* Universe::_fillerArrayKlass = nullptr;
123 OopHandle Universe::_basic_type_mirrors[T_VOID+1];
124 #if INCLUDE_CDS_JAVA_HEAP
125 int Universe::_archived_basic_type_mirror_indices[T_VOID+1];
126 #endif
127
128 OopHandle Universe::_main_thread_group;
129 OopHandle Universe::_system_thread_group;
130 OopHandle Universe::_the_empty_class_array;
131 OopHandle Universe::_the_null_string;
132 OopHandle Universe::_the_min_jint_string;
133
134 OopHandle Universe::_the_null_sentinel;
135
136 // _out_of_memory_errors is an objArray
137 enum OutOfMemoryInstance { _oom_java_heap,
138 _oom_c_heap,
139 _oom_metaspace,
140 _oom_class_metaspace,
141 _oom_array_size,
142 _oom_gc_overhead_limit,
143 _oom_realloc_objects,
144 _oom_count };
145
146 OopHandle Universe::_out_of_memory_errors;
147 OopHandle Universe:: _class_init_stack_overflow_error;
148 OopHandle Universe::_delayed_stack_overflow_error_message;
149 OopHandle Universe::_preallocated_out_of_memory_error_array;
150 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
151
152 // Message details for OOME objects, preallocate these objects since they could be
153 // used when throwing OOME, we should try to avoid further allocation in such case
154 OopHandle Universe::_msg_metaspace;
155 OopHandle Universe::_msg_class_metaspace;
156
157 OopHandle Universe::_reference_pending_list;
158
159 Array<Klass*>* Universe::_the_array_interfaces_array = nullptr;
160
161 long Universe::verify_flags = Universe::Verify_All;
162
163 Array<int>* Universe::_the_empty_int_array = nullptr;
164 Array<u2>* Universe::_the_empty_short_array = nullptr;
165 Array<Klass*>* Universe::_the_empty_klass_array = nullptr;
166 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = nullptr;
167 Array<Method*>* Universe::_the_empty_method_array = nullptr;
168
169 uintx Universe::_the_array_interfaces_bitmap = 0;
170 uintx Universe::_the_empty_klass_bitmap = 0;
171
172 // These variables are guarded by FullGCALot_lock.
173 DEBUG_ONLY(OopHandle Universe::_fullgc_alot_dummy_array;)
174 DEBUG_ONLY(int Universe::_fullgc_alot_dummy_next = 0;)
175
176 // Heap
177 int Universe::_verify_count = 0;
178
179 // Oop verification (see MacroAssembler::verify_oop)
180 uintptr_t Universe::_verify_oop_mask = 0;
181 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
182
183 int Universe::_base_vtable_size = 0;
184 bool Universe::_bootstrapping = false;
185 bool Universe::_module_initialized = false;
186 bool Universe::_fully_initialized = false;
187
188 OopStorage* Universe::_vm_weak = nullptr;
189 OopStorage* Universe::_vm_global = nullptr;
190
191 CollectedHeap* Universe::_collectedHeap = nullptr;
192
193 // These are the exceptions that are always created and are guatanteed to exist.
194 // If possible, they can be stored as CDS archived objects to speed up AOT code.
195 class BuiltinException {
196 OopHandle _instance;
197 CDS_JAVA_HEAP_ONLY(int _archived_root_index;)
198
199 public:
200 BuiltinException() : _instance() {
201 CDS_JAVA_HEAP_ONLY(_archived_root_index = 0);
202 }
203
204 void init_if_empty(Symbol* symbol, TRAPS) {
205 if (_instance.is_empty()) {
206 Klass* k = SystemDictionary::resolve_or_fail(symbol, true, CHECK);
207 oop obj = InstanceKlass::cast(k)->allocate_instance(CHECK);
208 _instance = OopHandle(Universe::vm_global(), obj);
209 }
210 }
211
212 oop instance() {
213 return _instance.resolve();
214 }
215
216 #if INCLUDE_CDS_JAVA_HEAP
217 void store_in_cds() {
218 _archived_root_index = HeapShared::archive_exception_instance(instance());
219 }
220
221 void load_from_cds() {
222 if (_archived_root_index >= 0) {
223 oop obj = HeapShared::get_root(_archived_root_index);
224 assert(obj != nullptr, "must be");
225 _instance = OopHandle(Universe::vm_global(), obj);
226 }
227 }
228
229 void serialize(SerializeClosure *f) {
230 f->do_int(&_archived_root_index);
231 }
232 #endif
233 };
234
235 static BuiltinException _null_ptr_exception;
236 static BuiltinException _arithmetic_exception;
237 static BuiltinException _internal_error;
238 static BuiltinException _array_index_out_of_bounds_exception;
239 static BuiltinException _array_store_exception;
240 static BuiltinException _class_cast_exception;
241
242 objArrayOop Universe::the_empty_class_array () {
243 return (objArrayOop)_the_empty_class_array.resolve();
244 }
245
246 oop Universe::main_thread_group() { return _main_thread_group.resolve(); }
247 void Universe::set_main_thread_group(oop group) { _main_thread_group = OopHandle(vm_global(), group); }
248
249 oop Universe::system_thread_group() { return _system_thread_group.resolve(); }
250 void Universe::set_system_thread_group(oop group) { _system_thread_group = OopHandle(vm_global(), group); }
251
252 oop Universe::the_null_string() { return _the_null_string.resolve(); }
253 oop Universe::the_min_jint_string() { return _the_min_jint_string.resolve(); }
254
255 oop Universe::null_ptr_exception_instance() { return _null_ptr_exception.instance(); }
256 oop Universe::arithmetic_exception_instance() { return _arithmetic_exception.instance(); }
257 oop Universe::internal_error_instance() { return _internal_error.instance(); }
258 oop Universe::array_index_out_of_bounds_exception_instance() { return _array_index_out_of_bounds_exception.instance(); }
259 oop Universe::array_store_exception_instance() { return _array_store_exception.instance(); }
260 oop Universe::class_cast_exception_instance() { return _class_cast_exception.instance(); }
261
262 oop Universe::the_null_sentinel() { return _the_null_sentinel.resolve(); }
263
264 oop Universe::int_mirror() { return check_mirror(_basic_type_mirrors[T_INT].resolve()); }
265 oop Universe::float_mirror() { return check_mirror(_basic_type_mirrors[T_FLOAT].resolve()); }
266 oop Universe::double_mirror() { return check_mirror(_basic_type_mirrors[T_DOUBLE].resolve()); }
267 oop Universe::byte_mirror() { return check_mirror(_basic_type_mirrors[T_BYTE].resolve()); }
268 oop Universe::bool_mirror() { return check_mirror(_basic_type_mirrors[T_BOOLEAN].resolve()); }
269 oop Universe::char_mirror() { return check_mirror(_basic_type_mirrors[T_CHAR].resolve()); }
270 oop Universe::long_mirror() { return check_mirror(_basic_type_mirrors[T_LONG].resolve()); }
271 oop Universe::short_mirror() { return check_mirror(_basic_type_mirrors[T_SHORT].resolve()); }
272 oop Universe::void_mirror() { return check_mirror(_basic_type_mirrors[T_VOID].resolve()); }
273
274 oop Universe::java_mirror(BasicType t) {
275 assert((uint)t < T_VOID+1, "range check");
276 assert(!is_reference_type(t), "sanity");
277 return check_mirror(_basic_type_mirrors[t].resolve());
278 }
279
280 void Universe::basic_type_classes_do(KlassClosure *closure) {
281 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
282 closure->do_klass(_typeArrayKlasses[i]);
283 }
284 // We don't do the following because it will confuse JVMTI.
285 // _fillerArrayKlass is used only by GC, which doesn't need to see
286 // this klass from basic_type_classes_do().
287 //
288 // closure->do_klass(_fillerArrayKlass);
289 }
290
291 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
292 it->push(&_fillerArrayKlass);
293 for (int i = 0; i < T_LONG+1; i++) {
294 it->push(&_typeArrayKlasses[i]);
295 }
296 it->push(&_objectArrayKlass);
297
298 it->push(&_the_empty_int_array);
299 it->push(&_the_empty_short_array);
300 it->push(&_the_empty_klass_array);
301 it->push(&_the_empty_instance_klass_array);
302 it->push(&_the_empty_method_array);
303 it->push(&_the_array_interfaces_array);
304 }
305
306 #if INCLUDE_CDS_JAVA_HEAP
307 void Universe::set_archived_basic_type_mirror_index(BasicType t, int index) {
308 assert(CDSConfig::is_dumping_heap(), "sanity");
309 assert(!is_reference_type(t), "sanity");
310 _archived_basic_type_mirror_indices[t] = index;
311 }
312
313 void Universe::archive_exception_instances() {
314 _null_ptr_exception.store_in_cds();
315 _arithmetic_exception.store_in_cds();
316 _internal_error.store_in_cds();
317 _array_index_out_of_bounds_exception.store_in_cds();
318 _array_store_exception.store_in_cds();
319 _class_cast_exception.store_in_cds();
320 }
321
322 void Universe::load_archived_object_instances() {
323 if (ArchiveHeapLoader::is_in_use()) {
324 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
325 int index = _archived_basic_type_mirror_indices[i];
326 if (!is_reference_type((BasicType)i) && index >= 0) {
327 oop mirror_oop = HeapShared::get_root(index);
328 assert(mirror_oop != nullptr, "must be");
329 _basic_type_mirrors[i] = OopHandle(vm_global(), mirror_oop);
330 }
331 }
332
333 _null_ptr_exception.load_from_cds();
334 _arithmetic_exception.load_from_cds();
335 _internal_error.load_from_cds();
336 _array_index_out_of_bounds_exception.load_from_cds();
337 _array_store_exception.load_from_cds();
338 _class_cast_exception.load_from_cds();
339 }
340 }
341 #endif
342
343 void Universe::serialize(SerializeClosure* f) {
344
345 #if INCLUDE_CDS_JAVA_HEAP
346 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
347 f->do_int(&_archived_basic_type_mirror_indices[i]);
348 // if f->reading(): We can't call HeapShared::get_root() yet, as the heap
349 // contents may need to be relocated. _basic_type_mirrors[i] will be
350 // updated later in Universe::load_archived_object_instances().
351 }
352 _null_ptr_exception.serialize(f);
353 _arithmetic_exception.serialize(f);
354 _internal_error.serialize(f);
355 _array_index_out_of_bounds_exception.serialize(f);
356 _array_store_exception.serialize(f);
357 _class_cast_exception.serialize(f);
358 #endif
359
360 f->do_ptr(&_fillerArrayKlass);
361 for (int i = 0; i < T_LONG+1; i++) {
362 f->do_ptr(&_typeArrayKlasses[i]);
363 }
364
365 f->do_ptr(&_objectArrayKlass);
366 f->do_ptr(&_the_array_interfaces_array);
367 f->do_ptr(&_the_empty_int_array);
368 f->do_ptr(&_the_empty_short_array);
369 f->do_ptr(&_the_empty_method_array);
370 f->do_ptr(&_the_empty_klass_array);
371 f->do_ptr(&_the_empty_instance_klass_array);
372 }
373
374
375 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
376 if (size < alignment || size % alignment != 0) {
377 vm_exit_during_initialization(
378 err_msg("Size of %s (%zu bytes) must be aligned to %zu bytes", name, size, alignment));
379 }
380 }
381
382 static void initialize_basic_type_klass(Klass* k, TRAPS) {
383 Klass* ok = vmClasses::Object_klass();
384 #if INCLUDE_CDS
385 if (CDSConfig::is_using_archive()) {
386 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
387 assert(k->super() == ok, "u3");
388 if (k->is_instance_klass()) {
389 InstanceKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), nullptr, CHECK);
390 } else {
391 ArrayKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), CHECK);
392 }
393 } else
394 #endif
395 {
396 k->initialize_supers(ok, nullptr, CHECK);
397 }
398 k->append_to_sibling_list();
399 }
400
401 void Universe::genesis(TRAPS) {
402 ResourceMark rm(THREAD);
403 HandleMark hm(THREAD);
404
405 // Explicit null checks are needed if these offsets are not smaller than the page size
406 if (UseCompactObjectHeaders) {
407 assert(oopDesc::mark_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()),
408 "Mark offset is expected to be less than the page size");
409 } else {
410 assert(oopDesc::klass_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()),
411 "Klass offset is expected to be less than the page size");
412 }
413 assert(arrayOopDesc::length_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()),
414 "Array length offset is expected to be less than the page size");
415
416 { AutoModifyRestore<bool> temporarily(_bootstrapping, true);
417
418 java_lang_Class::allocate_fixup_lists();
419
420 // determine base vtable size; without that we cannot create the array klasses
421 compute_base_vtable_size();
422
423 if (!CDSConfig::is_using_archive()) {
424 // Initialization of the fillerArrayKlass must come before regular
425 // int-TypeArrayKlass so that the int-Array mirror points to the
426 // int-TypeArrayKlass.
427 _fillerArrayKlass = TypeArrayKlass::create_klass(T_INT, "[Ljdk/internal/vm/FillerElement;", CHECK);
428 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
429 _typeArrayKlasses[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK);
430 }
431
432 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
433
434 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, nullptr, CHECK);
435 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
436 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
437 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
438 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
439 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK);
440 }
441
442 vmSymbols::initialize();
443
444 // Initialize table for matching jmethodID, before SystemDictionary.
445 JmethodIDTable::initialize();
446
447 SystemDictionary::initialize(CHECK);
448
449 // Create string constants
450 oop s = StringTable::intern("null", CHECK);
451 _the_null_string = OopHandle(vm_global(), s);
452 s = StringTable::intern("-2147483648", CHECK);
453 _the_min_jint_string = OopHandle(vm_global(), s);
454
455 #if INCLUDE_CDS
456 if (CDSConfig::is_using_archive()) {
457 // Verify shared interfaces array.
458 assert(_the_array_interfaces_array->at(0) ==
459 vmClasses::Cloneable_klass(), "u3");
460 assert(_the_array_interfaces_array->at(1) ==
461 vmClasses::Serializable_klass(), "u3");
462
463 } else
464 #endif
465 {
466 // Set up shared interfaces array. (Do this before supers are set up.)
467 _the_array_interfaces_array->at_put(0, vmClasses::Cloneable_klass());
468 _the_array_interfaces_array->at_put(1, vmClasses::Serializable_klass());
469 }
470
471 _the_array_interfaces_bitmap = Klass::compute_secondary_supers_bitmap(_the_array_interfaces_array);
472 _the_empty_klass_bitmap = Klass::compute_secondary_supers_bitmap(_the_empty_klass_array);
473
474 initialize_basic_type_klass(_fillerArrayKlass, CHECK);
475
476 initialize_basic_type_klass(boolArrayKlass(), CHECK);
477 initialize_basic_type_klass(charArrayKlass(), CHECK);
478 initialize_basic_type_klass(floatArrayKlass(), CHECK);
479 initialize_basic_type_klass(doubleArrayKlass(), CHECK);
480 initialize_basic_type_klass(byteArrayKlass(), CHECK);
481 initialize_basic_type_klass(shortArrayKlass(), CHECK);
482 initialize_basic_type_klass(intArrayKlass(), CHECK);
483 initialize_basic_type_klass(longArrayKlass(), CHECK);
484
485 assert(_fillerArrayKlass != intArrayKlass(),
486 "Internal filler array klass should be different to int array Klass");
487 } // end of core bootstrapping
488
489 {
490 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
491 _the_null_sentinel = OopHandle(vm_global(), tns());
492 }
493
494 // Create a handle for reference_pending_list
495 _reference_pending_list = OopHandle(vm_global(), nullptr);
496
497 // Maybe this could be lifted up now that object array can be initialized
498 // during the bootstrapping.
499
500 // OLD
501 // Initialize _objectArrayKlass after core bootstraping to make
502 // sure the super class is set up properly for _objectArrayKlass.
503 // ---
504 // NEW
505 // Since some of the old system object arrays have been converted to
506 // ordinary object arrays, _objectArrayKlass will be loaded when
507 // SystemDictionary::initialize(CHECK); is run. See the extra check
508 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
509 {
510 ArrayKlass* oak = vmClasses::Object_klass()->array_klass(CHECK);
511 oak->append_to_sibling_list();
512
513 // Create a RefArrayKlass (which is the default) and initialize.
514 ObjArrayKlass* rak = ObjArrayKlass::cast(oak)->klass_with_properties(ArrayKlass::ArrayProperties::DEFAULT, THREAD);
515 _objectArrayKlass = rak;
516 }
517
518 #ifdef ASSERT
519 if (FullGCALot) {
520 // Allocate an array of dummy objects.
521 // We'd like these to be at the bottom of the old generation,
522 // so that when we free one and then collect,
523 // (almost) the whole heap moves
524 // and we find out if we actually update all the oops correctly.
525 // But we can't allocate directly in the old generation,
526 // so we allocate wherever, and hope that the first collection
527 // moves these objects to the bottom of the old generation.
528 int size = FullGCALotDummies * 2;
529
530 objArrayOop naked_array = oopFactory::new_objArray(vmClasses::Object_klass(), size, CHECK);
531 objArrayHandle dummy_array(THREAD, naked_array);
532 int i = 0;
533 while (i < size) {
534 // Allocate dummy in old generation
535 oop dummy = vmClasses::Object_klass()->allocate_instance(CHECK);
536 dummy_array->obj_at_put(i++, dummy);
537 }
538 {
539 // Only modify the global variable inside the mutex.
540 // If we had a race to here, the other dummy_array instances
541 // and their elements just get dropped on the floor, which is fine.
542 MutexLocker ml(THREAD, FullGCALot_lock);
543 if (_fullgc_alot_dummy_array.is_empty()) {
544 _fullgc_alot_dummy_array = OopHandle(vm_global(), dummy_array());
545 }
546 }
547 assert(i == ((objArrayOop)_fullgc_alot_dummy_array.resolve())->length(), "just checking");
548 }
549 #endif
550 }
551
552 void Universe::initialize_basic_type_mirrors(TRAPS) {
553 #if INCLUDE_CDS_JAVA_HEAP
554 if (CDSConfig::is_using_archive() &&
555 ArchiveHeapLoader::is_in_use() &&
556 _basic_type_mirrors[T_INT].resolve() != nullptr) {
557 assert(ArchiveHeapLoader::can_use(), "Sanity");
558
559 // check that all basic type mirrors are mapped also
560 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
561 if (!is_reference_type((BasicType)i)) {
562 oop m = _basic_type_mirrors[i].resolve();
563 assert(m != nullptr, "archived mirrors should not be null");
564 }
565 }
566 } else
567 // _basic_type_mirrors[T_INT], etc, are null if archived heap is not mapped.
568 #endif
569 {
570 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
571 BasicType bt = (BasicType)i;
572 if (!is_reference_type(bt)) {
573 oop m = java_lang_Class::create_basic_type_mirror(type2name(bt), bt, CHECK);
574 _basic_type_mirrors[i] = OopHandle(vm_global(), m);
575 }
576 CDS_JAVA_HEAP_ONLY(_archived_basic_type_mirror_indices[i] = -1);
577 }
578 }
579 if (CDSConfig::is_dumping_heap()) {
580 HeapShared::init_scratch_objects_for_basic_type_mirrors(CHECK);
581 }
582 }
583
584 void Universe::fixup_mirrors(TRAPS) {
585 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
586 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
587 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
588 // that the number of objects allocated at this point is very small.
589 assert(vmClasses::Class_klass_loaded(), "java.lang.Class should be loaded");
590 HandleMark hm(THREAD);
591
592 if (!CDSConfig::is_using_archive()) {
593 // Cache the start of the static fields
594 InstanceMirrorKlass::init_offset_of_static_fields();
595 }
596
597 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
598 int list_length = list->length();
599 for (int i = 0; i < list_length; i++) {
600 Klass* k = list->at(i);
601 assert(k->is_klass(), "List should only hold classes");
602 java_lang_Class::fixup_mirror(k, CATCH);
603 }
604 delete java_lang_Class::fixup_mirror_list();
605 java_lang_Class::set_fixup_mirror_list(nullptr);
606 }
607
608 #define assert_pll_locked(test) \
609 assert(Heap_lock->test(), "Reference pending list access requires lock")
610
611 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
612
613 oop Universe::reference_pending_list() {
614 if (Thread::current()->is_VM_thread()) {
615 assert_pll_locked(is_locked);
616 } else {
617 assert_pll_ownership();
618 }
619 return _reference_pending_list.resolve();
620 }
621
622 void Universe::clear_reference_pending_list() {
623 assert_pll_ownership();
624 _reference_pending_list.replace(nullptr);
625 }
626
627 bool Universe::has_reference_pending_list() {
628 assert_pll_ownership();
629 return _reference_pending_list.peek() != nullptr;
630 }
631
632 oop Universe::swap_reference_pending_list(oop list) {
633 assert_pll_locked(is_locked);
634 return _reference_pending_list.xchg(list);
635 }
636
637 #undef assert_pll_locked
638 #undef assert_pll_ownership
639
640 static void reinitialize_vtables() {
641 // The vtables are initialized by starting at java.lang.Object and
642 // initializing through the subclass links, so that the super
643 // classes are always initialized first.
644 for (ClassHierarchyIterator iter(vmClasses::Object_klass()); !iter.done(); iter.next()) {
645 Klass* sub = iter.klass();
646 sub->vtable().initialize_vtable();
647 }
648
649 // This isn't added to the subclass list, so need to reinitialize vtables directly.
650 Universe::objectArrayKlass()->vtable().initialize_vtable();
651 }
652
653 static void reinitialize_itables() {
654
655 class ReinitTableClosure : public KlassClosure {
656 public:
657 void do_klass(Klass* k) {
658 if (k->is_instance_klass()) {
659 InstanceKlass::cast(k)->itable().initialize_itable();
660 }
661 }
662 };
663
664 MutexLocker mcld(ClassLoaderDataGraph_lock);
665 ReinitTableClosure cl;
666 ClassLoaderDataGraph::classes_do(&cl);
667 }
668
669 bool Universe::on_page_boundary(void* addr) {
670 return is_aligned(addr, os::vm_page_size());
671 }
672
673 // the array of preallocated errors with backtraces
674 objArrayOop Universe::preallocated_out_of_memory_errors() {
675 return (objArrayOop)_preallocated_out_of_memory_error_array.resolve();
676 }
677
678 objArrayOop Universe::out_of_memory_errors() { return (objArrayOop)_out_of_memory_errors.resolve(); }
679
680 oop Universe::out_of_memory_error_java_heap() {
681 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_java_heap));
682 }
683
684 oop Universe::out_of_memory_error_java_heap_without_backtrace() {
685 return out_of_memory_errors()->obj_at(_oom_java_heap);
686 }
687
688 oop Universe::out_of_memory_error_c_heap() {
689 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_c_heap));
690 }
691
692 oop Universe::out_of_memory_error_metaspace() {
693 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_metaspace));
694 }
695
696 oop Universe::out_of_memory_error_class_metaspace() {
697 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_class_metaspace));
698 }
699
700 oop Universe::out_of_memory_error_array_size() {
701 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_array_size));
702 }
703
704 oop Universe::out_of_memory_error_gc_overhead_limit() {
705 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_gc_overhead_limit));
706 }
707
708 oop Universe::out_of_memory_error_realloc_objects() {
709 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_realloc_objects));
710 }
711
712 oop Universe::class_init_out_of_memory_error() { return out_of_memory_errors()->obj_at(_oom_java_heap); }
713 oop Universe::class_init_stack_overflow_error() { return _class_init_stack_overflow_error.resolve(); }
714 oop Universe::delayed_stack_overflow_error_message() { return _delayed_stack_overflow_error_message.resolve(); }
715
716
717 bool Universe::should_fill_in_stack_trace(Handle throwable) {
718 // never attempt to fill in the stack trace of preallocated errors that do not have
719 // backtrace. These errors are kept alive forever and may be "re-used" when all
720 // preallocated errors with backtrace have been consumed. Also need to avoid
721 // a potential loop which could happen if an out of memory occurs when attempting
722 // to allocate the backtrace.
723 objArrayOop preallocated_oom = out_of_memory_errors();
724 for (int i = 0; i < _oom_count; i++) {
725 if (throwable() == preallocated_oom->obj_at(i)) {
726 return false;
727 }
728 }
729 return true;
730 }
731
732
733 oop Universe::gen_out_of_memory_error(oop default_err) {
734 // generate an out of memory error:
735 // - if there is a preallocated error and stack traces are available
736 // (j.l.Throwable is initialized), then return the preallocated
737 // error with a filled in stack trace, and with the message
738 // provided by the default error.
739 // - otherwise, return the default error, without a stack trace.
740 int next;
741 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
742 vmClasses::Throwable_klass()->is_initialized()) {
743 next = (int)Atomic::add(&_preallocated_out_of_memory_error_avail_count, -1);
744 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
745 } else {
746 next = -1;
747 }
748 if (next < 0) {
749 // all preallocated errors have been used.
750 // return default
751 return default_err;
752 } else {
753 JavaThread* current = JavaThread::current();
754 Handle default_err_h(current, default_err);
755 // get the error object at the slot and set set it to null so that the
756 // array isn't keeping it alive anymore.
757 Handle exc(current, preallocated_out_of_memory_errors()->obj_at(next));
758 assert(exc() != nullptr, "slot has been used already");
759 preallocated_out_of_memory_errors()->obj_at_put(next, nullptr);
760
761 // use the message from the default error
762 oop msg = java_lang_Throwable::message(default_err_h());
763 assert(msg != nullptr, "no message");
764 java_lang_Throwable::set_message(exc(), msg);
765
766 // populate the stack trace and return it.
767 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
768 return exc();
769 }
770 }
771
772 bool Universe::is_out_of_memory_error_metaspace(oop ex_obj) {
773 return java_lang_Throwable::message(ex_obj) == _msg_metaspace.resolve();
774 }
775
776 bool Universe::is_out_of_memory_error_class_metaspace(oop ex_obj) {
777 return java_lang_Throwable::message(ex_obj) == _msg_class_metaspace.resolve();
778 }
779
780 // Setup preallocated OutOfMemoryError errors
781 void Universe::create_preallocated_out_of_memory_errors(TRAPS) {
782 InstanceKlass* ik = vmClasses::OutOfMemoryError_klass();
783 objArrayOop oa = oopFactory::new_objArray(ik, _oom_count, CHECK);
784 objArrayHandle oom_array(THREAD, oa);
785
786 for (int i = 0; i < _oom_count; i++) {
787 oop oom_obj = ik->allocate_instance(CHECK);
788 oom_array->obj_at_put(i, oom_obj);
789 }
790 _out_of_memory_errors = OopHandle(vm_global(), oom_array());
791
792 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK);
793 java_lang_Throwable::set_message(oom_array->obj_at(_oom_java_heap), msg());
794
795 msg = java_lang_String::create_from_str("C heap space", CHECK);
796 java_lang_Throwable::set_message(oom_array->obj_at(_oom_c_heap), msg());
797
798 msg = java_lang_String::create_from_str("Metaspace", CHECK);
799 _msg_metaspace = OopHandle(vm_global(), msg());
800 java_lang_Throwable::set_message(oom_array->obj_at(_oom_metaspace), msg());
801
802 msg = java_lang_String::create_from_str("Compressed class space", CHECK);
803 _msg_class_metaspace = OopHandle(vm_global(), msg());
804 java_lang_Throwable::set_message(oom_array->obj_at(_oom_class_metaspace), msg());
805
806 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK);
807 java_lang_Throwable::set_message(oom_array->obj_at(_oom_array_size), msg());
808
809 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK);
810 java_lang_Throwable::set_message(oom_array->obj_at(_oom_gc_overhead_limit), msg());
811
812 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK);
813 java_lang_Throwable::set_message(oom_array->obj_at(_oom_realloc_objects), msg());
814
815 // Setup the array of errors that have preallocated backtrace
816 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
817 objArrayOop instance = oopFactory::new_objArray(ik, len, CHECK);
818 _preallocated_out_of_memory_error_array = OopHandle(vm_global(), instance);
819 objArrayHandle preallocated_oom_array(THREAD, instance);
820
821 for (int i=0; i<len; i++) {
822 oop err = ik->allocate_instance(CHECK);
823 Handle err_h(THREAD, err);
824 java_lang_Throwable::allocate_backtrace(err_h, CHECK);
825 preallocated_oom_array->obj_at_put(i, err_h());
826 }
827 _preallocated_out_of_memory_error_avail_count = (jint)len;
828 }
829
830 intptr_t Universe::_non_oop_bits = 0;
831
832 void* Universe::non_oop_word() {
833 // Neither the high bits nor the low bits of this value is allowed
834 // to look like (respectively) the high or low bits of a real oop.
835 //
836 // High and low are CPU-specific notions, but low always includes
837 // the low-order bit. Since oops are always aligned at least mod 4,
838 // setting the low-order bit will ensure that the low half of the
839 // word will never look like that of a real oop.
840 //
841 // Using the OS-supplied non-memory-address word (usually 0 or -1)
842 // will take care of the high bits, however many there are.
843
844 if (_non_oop_bits == 0) {
845 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
846 }
847
848 return (void*)_non_oop_bits;
849 }
850
851 bool Universe::contains_non_oop_word(void* p) {
852 return *(void**)p == non_oop_word();
853 }
854
855 static void initialize_global_behaviours() {
856 DefaultICProtectionBehaviour* protection_behavior = new DefaultICProtectionBehaviour();
857 // Ignore leak of DefaultICProtectionBehaviour. It is overriden by some GC implementations and the
858 // pointer is leaked once.
859 LSAN_IGNORE_OBJECT(protection_behavior);
860 CompiledICProtectionBehaviour::set_current(protection_behavior);
861 }
862
863 jint universe_init() {
864 assert(!Universe::_fully_initialized, "called after initialize_vtables");
865 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
866 "LogHeapWordSize is incorrect.");
867 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
868 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
869 "oop size is not not a multiple of HeapWord size");
870
871 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
872
873 initialize_global_behaviours();
874
875 GCLogPrecious::initialize();
876
877 // Initialize CPUTimeCounters object, which must be done before creation of the heap.
878 CPUTimeCounters::initialize();
879
880 ObjLayout::initialize();
881
882 #ifdef _LP64
883 MetaspaceShared::adjust_heap_sizes_for_dumping();
884 #endif // _LP64
885
886 GCConfig::arguments()->initialize_heap_sizes();
887
888 jint status = Universe::initialize_heap();
889 if (status != JNI_OK) {
890 return status;
891 }
892
893 Universe::initialize_tlab();
894
895 Metaspace::global_initialize();
896 // Initialize performance counters for metaspaces
897 MetaspaceCounters::initialize_performance_counters();
898
899 // Checks 'AfterMemoryInit' constraints.
900 if (!JVMFlagLimit::check_all_constraints(JVMFlagConstraintPhase::AfterMemoryInit)) {
901 return JNI_EINVAL;
902 }
903
904 #if INCLUDE_CDS
905 if (CDSConfig::is_using_archive()) {
906 // Read the data structures supporting the shared spaces (shared
907 // system dictionary, symbol table, etc.)
908 MetaspaceShared::initialize_shared_spaces();
909 }
910 #endif
911
912 ClassLoaderData::init_null_class_loader_data();
913
914 #if INCLUDE_CDS
915 #if INCLUDE_CDS_JAVA_HEAP
916 if (CDSConfig::is_using_full_module_graph()) {
917 ClassLoaderDataShared::restore_archived_entries_for_null_class_loader_data();
918 }
919 #endif // INCLUDE_CDS_JAVA_HEAP
920 if (CDSConfig::is_dumping_archive()) {
921 CDSConfig::prepare_for_dumping();
922 }
923 #endif
924
925 SymbolTable::create_table();
926 StringTable::create_table();
927
928 if (strlen(VerifySubSet) > 0) {
929 Universe::initialize_verify_flags();
930 }
931
932 ResolvedMethodTable::create_table();
933
934 return JNI_OK;
935 }
936
937 jint Universe::initialize_heap() {
938 assert(_collectedHeap == nullptr, "Heap already created");
939 _collectedHeap = GCConfig::arguments()->create_heap();
940
941 log_info(gc)("Using %s", _collectedHeap->name());
942 return _collectedHeap->initialize();
943 }
944
945 void Universe::initialize_tlab() {
946 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
947 PLAB::startup_initialization();
948 if (UseTLAB) {
949 ThreadLocalAllocBuffer::startup_initialization();
950 }
951 }
952
953 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
954
955 assert(alignment <= Arguments::conservative_max_heap_alignment(),
956 "actual alignment %zu must be within maximum heap alignment %zu",
957 alignment, Arguments::conservative_max_heap_alignment());
958 assert(is_aligned(heap_size, alignment), "precondition");
959
960 size_t total_reserved = heap_size;
961 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
962 "heap size is too big for compressed oops");
963
964 size_t page_size = os::vm_page_size();
965 if (UseLargePages && is_aligned(alignment, os::large_page_size())) {
966 page_size = os::large_page_size();
967 } else {
968 // Parallel is the only collector that might opt out of using large pages
969 // for the heap.
970 assert(!UseLargePages || UseParallelGC , "Wrong alignment to use large pages");
971 }
972
973 // Now create the space.
974 ReservedHeapSpace rhs = HeapReserver::reserve(total_reserved, alignment, page_size, AllocateHeapAt);
975
976 if (!rhs.is_reserved()) {
977 vm_exit_during_initialization(
978 err_msg("Could not reserve enough space for %zu KB object heap",
979 total_reserved/K));
980 }
981
982 assert(total_reserved == rhs.size(), "must be exactly of required size");
983 assert(is_aligned(rhs.base(),alignment),"must be exactly of required alignment");
984
985 assert(markWord::encode_pointer_as_mark(rhs.base()).decode_pointer() == rhs.base(),
986 "area must be distinguishable from marks for mark-sweep");
987 assert(markWord::encode_pointer_as_mark(&rhs.base()[rhs.size()]).decode_pointer() ==
988 &rhs.base()[rhs.size()],
989 "area must be distinguishable from marks for mark-sweep");
990
991 // We are good.
992
993 if (AllocateHeapAt != nullptr) {
994 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
995 }
996
997 if (UseCompressedOops) {
998 CompressedOops::initialize(rhs);
999 }
1000
1001 Universe::calculate_verify_data((HeapWord*)rhs.base(), (HeapWord*)rhs.end());
1002
1003 return rhs;
1004 }
1005
1006 OopStorage* Universe::vm_weak() {
1007 return Universe::_vm_weak;
1008 }
1009
1010 OopStorage* Universe::vm_global() {
1011 return Universe::_vm_global;
1012 }
1013
1014 void Universe::oopstorage_init() {
1015 Universe::_vm_global = OopStorageSet::create_strong("VM Global", mtInternal);
1016 Universe::_vm_weak = OopStorageSet::create_weak("VM Weak", mtInternal);
1017 }
1018
1019 void universe_oopstorage_init() {
1020 Universe::oopstorage_init();
1021 }
1022
1023 void LatestMethodCache::init(JavaThread* current, InstanceKlass* ik,
1024 const char* method, Symbol* signature, bool is_static)
1025 {
1026 TempNewSymbol name = SymbolTable::new_symbol(method);
1027 Method* m = nullptr;
1028 // The klass must be linked before looking up the method.
1029 if (!ik->link_class_or_fail(current) ||
1030 ((m = ik->find_method(name, signature)) == nullptr) ||
1031 is_static != m->is_static()) {
1032 ResourceMark rm(current);
1033 // NoSuchMethodException doesn't actually work because it tries to run the
1034 // <init> function before java_lang_Class is linked. Print error and exit.
1035 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
1036 ik->name()->as_C_string(), method));
1037 }
1038
1039 _klass = ik;
1040 _method_idnum = m->method_idnum();
1041 assert(_method_idnum >= 0, "sanity check");
1042 }
1043
1044 Method* LatestMethodCache::get_method() {
1045 if (_klass == nullptr) {
1046 return nullptr;
1047 } else {
1048 Method* m = _klass->method_with_idnum(_method_idnum);
1049 assert(m != nullptr, "sanity check");
1050 return m;
1051 }
1052 }
1053
1054 Method* Universe::finalizer_register_method() { return _finalizer_register_cache.get_method(); }
1055 Method* Universe::loader_addClass_method() { return _loader_addClass_cache.get_method(); }
1056 Method* Universe::throw_illegal_access_error() { return _throw_illegal_access_error_cache.get_method(); }
1057 Method* Universe::throw_no_such_method_error() { return _throw_no_such_method_error_cache.get_method(); }
1058 Method* Universe::do_stack_walk_method() { return _do_stack_walk_cache.get_method(); }
1059 Method* Universe::is_substitutable_method() { return _is_substitutable_cache.get_method(); }
1060 Method* Universe::value_object_hash_code_method() { return _value_object_hash_code_cache.get_method(); }
1061
1062 void Universe::initialize_known_methods(JavaThread* current) {
1063 // Set up static method for registering finalizers
1064 _finalizer_register_cache.init(current,
1065 vmClasses::Finalizer_klass(),
1066 "register",
1067 vmSymbols::object_void_signature(), true);
1068
1069 _throw_illegal_access_error_cache.init(current,
1070 vmClasses::internal_Unsafe_klass(),
1071 "throwIllegalAccessError",
1072 vmSymbols::void_method_signature(), true);
1073
1074 _throw_no_such_method_error_cache.init(current,
1075 vmClasses::internal_Unsafe_klass(),
1076 "throwNoSuchMethodError",
1077 vmSymbols::void_method_signature(), true);
1078
1079 // Set up method for registering loaded classes in class loader vector
1080 _loader_addClass_cache.init(current,
1081 vmClasses::ClassLoader_klass(),
1082 "addClass",
1083 vmSymbols::class_void_signature(), false);
1084
1085 // Set up method for stack walking
1086 _do_stack_walk_cache.init(current,
1087 vmClasses::AbstractStackWalker_klass(),
1088 "doStackWalk",
1089 vmSymbols::doStackWalk_signature(), false);
1090
1091 // Set up substitutability testing
1092 ResourceMark rm(current);
1093 _is_substitutable_cache.init(current,
1094 vmClasses::ValueObjectMethods_klass(),
1095 vmSymbols::isSubstitutable_name()->as_C_string(),
1096 vmSymbols::object_object_boolean_signature(), true);
1097 _value_object_hash_code_cache.init(current,
1098 vmClasses::ValueObjectMethods_klass(),
1099 vmSymbols::valueObjectHashCode_name()->as_C_string(),
1100 vmSymbols::object_int_signature(), true);
1101 }
1102
1103 void universe2_init() {
1104 EXCEPTION_MARK;
1105 Universe::genesis(CATCH);
1106 }
1107
1108 // Set after initialization of the module runtime, call_initModuleRuntime
1109 void universe_post_module_init() {
1110 Universe::_module_initialized = true;
1111 }
1112
1113 bool universe_post_init() {
1114 assert(!is_init_completed(), "Error: initialization not yet completed!");
1115 Universe::_fully_initialized = true;
1116 EXCEPTION_MARK;
1117 if (!CDSConfig::is_using_archive()) {
1118 reinitialize_vtables();
1119 reinitialize_itables();
1120 }
1121
1122 HandleMark hm(THREAD);
1123 // Setup preallocated empty java.lang.Class array for Method reflection.
1124
1125 objArrayOop the_empty_class_array = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_false);
1126 Universe::_the_empty_class_array = OopHandle(Universe::vm_global(), the_empty_class_array);
1127
1128 // Setup preallocated OutOfMemoryError errors
1129 Universe::create_preallocated_out_of_memory_errors(CHECK_false);
1130
1131 oop instance;
1132 // Setup preallocated cause message for delayed StackOverflowError
1133 if (StackReservedPages > 0) {
1134 instance = java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
1135 Universe::_delayed_stack_overflow_error_message = OopHandle(Universe::vm_global(), instance);
1136 }
1137
1138 // Setup preallocated exceptions used for a cheap & dirty solution in compiler exception handling
1139 _null_ptr_exception.init_if_empty(vmSymbols::java_lang_NullPointerException(), CHECK_false);
1140 _arithmetic_exception.init_if_empty(vmSymbols::java_lang_ArithmeticException(), CHECK_false);
1141 _array_index_out_of_bounds_exception.init_if_empty(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), CHECK_false);
1142 _array_store_exception.init_if_empty(vmSymbols::java_lang_ArrayStoreException(), CHECK_false);
1143 _class_cast_exception.init_if_empty(vmSymbols::java_lang_ClassCastException(), CHECK_false);
1144
1145 // Virtual Machine Error for when we get into a situation we can't resolve
1146 Klass* k = vmClasses::InternalError_klass();
1147 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1148 if (!linked) {
1149 tty->print_cr("Unable to link/verify InternalError class");
1150 return false; // initialization failed
1151 }
1152 _internal_error.init_if_empty(vmSymbols::java_lang_InternalError(), CHECK_false);
1153
1154 Handle msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1155 java_lang_Throwable::set_message(Universe::arithmetic_exception_instance(), msg());
1156
1157 // Setup preallocated StackOverflowError for use with class initialization failure
1158 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_StackOverflowError(), true, CHECK_false);
1159 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1160 Universe::_class_init_stack_overflow_error = OopHandle(Universe::vm_global(), instance);
1161
1162 Universe::initialize_known_methods(THREAD);
1163
1164 // This needs to be done before the first scavenge/gc, since
1165 // it's an input to soft ref clearing policy.
1166 {
1167 MutexLocker x(THREAD, Heap_lock);
1168 Universe::heap()->update_capacity_and_used_at_gc();
1169 }
1170
1171 // ("weak") refs processing infrastructure initialization
1172 Universe::heap()->post_initialize();
1173
1174 MemoryService::add_metaspace_memory_pools();
1175
1176 MemoryService::set_universe_heap(Universe::heap());
1177 #if INCLUDE_CDS
1178 MetaspaceShared::post_initialize(CHECK_false);
1179 #endif
1180 return true;
1181 }
1182
1183
1184 void Universe::compute_base_vtable_size() {
1185 _base_vtable_size = ClassLoader::compute_Object_vtable();
1186 }
1187
1188 void Universe::print_on(outputStream* st) {
1189 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1190 st->print_cr("Heap");
1191
1192 StreamIndentor si(st, 1);
1193 heap()->print_heap_on(st);
1194 MetaspaceUtils::print_on(st);
1195 }
1196
1197 void Universe::print_heap_at_SIGBREAK() {
1198 if (PrintHeapAtSIGBREAK) {
1199 print_on(tty);
1200 tty->cr();
1201 tty->flush();
1202 }
1203 }
1204
1205 void Universe::initialize_verify_flags() {
1206 verify_flags = 0;
1207 const char delimiter[] = " ,";
1208
1209 size_t length = strlen(VerifySubSet);
1210 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1211 strncpy(subset_list, VerifySubSet, length + 1);
1212 char* save_ptr;
1213
1214 char* token = strtok_r(subset_list, delimiter, &save_ptr);
1215 while (token != nullptr) {
1216 if (strcmp(token, "threads") == 0) {
1217 verify_flags |= Verify_Threads;
1218 } else if (strcmp(token, "heap") == 0) {
1219 verify_flags |= Verify_Heap;
1220 } else if (strcmp(token, "symbol_table") == 0) {
1221 verify_flags |= Verify_SymbolTable;
1222 } else if (strcmp(token, "string_table") == 0) {
1223 verify_flags |= Verify_StringTable;
1224 } else if (strcmp(token, "codecache") == 0) {
1225 verify_flags |= Verify_CodeCache;
1226 } else if (strcmp(token, "dictionary") == 0) {
1227 verify_flags |= Verify_SystemDictionary;
1228 } else if (strcmp(token, "classloader_data_graph") == 0) {
1229 verify_flags |= Verify_ClassLoaderDataGraph;
1230 } else if (strcmp(token, "metaspace") == 0) {
1231 verify_flags |= Verify_MetaspaceUtils;
1232 } else if (strcmp(token, "jni_handles") == 0) {
1233 verify_flags |= Verify_JNIHandles;
1234 } else if (strcmp(token, "codecache_oops") == 0) {
1235 verify_flags |= Verify_CodeCacheOops;
1236 } else if (strcmp(token, "resolved_method_table") == 0) {
1237 verify_flags |= Verify_ResolvedMethodTable;
1238 } else if (strcmp(token, "stringdedup") == 0) {
1239 verify_flags |= Verify_StringDedup;
1240 } else {
1241 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1242 }
1243 token = strtok_r(nullptr, delimiter, &save_ptr);
1244 }
1245 FREE_C_HEAP_ARRAY(char, subset_list);
1246 }
1247
1248 bool Universe::should_verify_subset(uint subset) {
1249 if (verify_flags & subset) {
1250 return true;
1251 }
1252 return false;
1253 }
1254
1255 void Universe::verify(VerifyOption option, const char* prefix) {
1256 COMPILER2_PRESENT(
1257 assert(!DerivedPointerTable::is_active(),
1258 "DPT should not be active during verification "
1259 "(of thread stacks below)");
1260 )
1261
1262 Thread* thread = Thread::current();
1263 ResourceMark rm(thread);
1264 HandleMark hm(thread); // Handles created during verification can be zapped
1265 _verify_count++;
1266
1267 FormatBuffer<> title("Verifying %s", prefix);
1268 GCTraceTime(Info, gc, verify) tm(title.buffer());
1269 if (should_verify_subset(Verify_Threads)) {
1270 log_debug(gc, verify)("Threads");
1271 Threads::verify();
1272 }
1273 if (should_verify_subset(Verify_Heap)) {
1274 log_debug(gc, verify)("Heap");
1275 heap()->verify(option);
1276 }
1277 if (should_verify_subset(Verify_SymbolTable)) {
1278 log_debug(gc, verify)("SymbolTable");
1279 SymbolTable::verify();
1280 }
1281 if (should_verify_subset(Verify_StringTable)) {
1282 log_debug(gc, verify)("StringTable");
1283 StringTable::verify();
1284 }
1285 if (should_verify_subset(Verify_CodeCache)) {
1286 log_debug(gc, verify)("CodeCache");
1287 CodeCache::verify();
1288 }
1289 if (should_verify_subset(Verify_SystemDictionary)) {
1290 log_debug(gc, verify)("SystemDictionary");
1291 SystemDictionary::verify();
1292 }
1293 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1294 log_debug(gc, verify)("ClassLoaderDataGraph");
1295 ClassLoaderDataGraph::verify();
1296 }
1297 if (should_verify_subset(Verify_MetaspaceUtils)) {
1298 log_debug(gc, verify)("MetaspaceUtils");
1299 DEBUG_ONLY(MetaspaceUtils::verify();)
1300 }
1301 if (should_verify_subset(Verify_JNIHandles)) {
1302 log_debug(gc, verify)("JNIHandles");
1303 JNIHandles::verify();
1304 }
1305 if (should_verify_subset(Verify_CodeCacheOops)) {
1306 log_debug(gc, verify)("CodeCache Oops");
1307 CodeCache::verify_oops();
1308 }
1309 if (should_verify_subset(Verify_ResolvedMethodTable)) {
1310 log_debug(gc, verify)("ResolvedMethodTable Oops");
1311 ResolvedMethodTable::verify();
1312 }
1313 if (should_verify_subset(Verify_StringDedup)) {
1314 log_debug(gc, verify)("String Deduplication");
1315 StringDedup::verify();
1316 }
1317 }
1318
1319
1320 #ifndef PRODUCT
1321 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1322 assert(low_boundary < high_boundary, "bad interval");
1323
1324 // decide which low-order bits we require to be clear:
1325 size_t alignSize = MinObjAlignmentInBytes;
1326 size_t min_object_size = CollectedHeap::min_fill_size();
1327
1328 // make an inclusive limit:
1329 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1330 uintptr_t min = (uintptr_t)low_boundary;
1331 assert(min < max, "bad interval");
1332 uintptr_t diff = max ^ min;
1333
1334 // throw away enough low-order bits to make the diff vanish
1335 uintptr_t mask = (uintptr_t)(-1);
1336 while ((mask & diff) != 0)
1337 mask <<= 1;
1338 uintptr_t bits = (min & mask);
1339 assert(bits == (max & mask), "correct mask");
1340 // check an intermediate value between min and max, just to make sure:
1341 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1342
1343 // require address alignment, too:
1344 mask |= (alignSize - 1);
1345
1346 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1347 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1348 }
1349 _verify_oop_mask = mask;
1350 _verify_oop_bits = bits;
1351 }
1352
1353 void Universe::set_verify_data(uintptr_t mask, uintptr_t bits) {
1354 _verify_oop_mask = mask;
1355 _verify_oop_bits = bits;
1356 }
1357
1358 // Oop verification (see MacroAssembler::verify_oop)
1359
1360 uintptr_t Universe::verify_oop_mask() {
1361 return _verify_oop_mask;
1362 }
1363
1364 uintptr_t Universe::verify_oop_bits() {
1365 return _verify_oop_bits;
1366 }
1367
1368 uintptr_t Universe::verify_mark_mask() {
1369 return markWord::lock_mask_in_place;
1370 }
1371
1372 uintptr_t Universe::verify_mark_bits() {
1373 intptr_t mask = verify_mark_mask();
1374 intptr_t bits = (intptr_t)markWord::prototype().value();
1375 assert((bits & ~mask) == 0, "no stray header bits");
1376 return bits;
1377 }
1378 #endif // PRODUCT
1379
1380 #ifdef ASSERT
1381 // Release dummy object(s) at bottom of heap
1382 bool Universe::release_fullgc_alot_dummy() {
1383 MutexLocker ml(FullGCALot_lock);
1384 objArrayOop fullgc_alot_dummy_array = (objArrayOop)_fullgc_alot_dummy_array.resolve();
1385 if (fullgc_alot_dummy_array != nullptr) {
1386 if (_fullgc_alot_dummy_next >= fullgc_alot_dummy_array->length()) {
1387 // No more dummies to release, release entire array instead
1388 _fullgc_alot_dummy_array.release(Universe::vm_global());
1389 _fullgc_alot_dummy_array = OopHandle(); // null out OopStorage pointer.
1390 return false;
1391 }
1392
1393 // Release dummy at bottom of old generation
1394 fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, nullptr);
1395 }
1396 return true;
1397 }
1398
1399 bool Universe::is_stw_gc_active() {
1400 return heap()->is_stw_gc_active();
1401 }
1402
1403 bool Universe::is_in_heap(const void* p) {
1404 return heap()->is_in(p);
1405 }
1406
1407 #endif // ASSERT