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