1 /*
2 * Copyright (c) 1997, 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "cds/archiveHeapLoader.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/dynamicArchive.hpp"
29 #include "cds/heapShared.hpp"
30 #include "cds/metaspaceShared.hpp"
31 #include "classfile/classLoader.hpp"
32 #include "classfile/classLoaderDataGraph.hpp"
33 #include "classfile/javaClasses.hpp"
34 #include "classfile/stringTable.hpp"
35 #include "classfile/symbolTable.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/vmClasses.hpp"
38 #include "classfile/vmSymbols.hpp"
39 #include "code/codeBehaviours.hpp"
40 #include "code/codeCache.hpp"
41 #include "compiler/oopMap.hpp"
42 #include "gc/shared/collectedHeap.inline.hpp"
43 #include "gc/shared/gcArguments.hpp"
44 #include "gc/shared/gcConfig.hpp"
45 #include "gc/shared/gcLogPrecious.hpp"
46 #include "gc/shared/gcTraceTime.inline.hpp"
47 #include "gc/shared/oopStorageSet.hpp"
48 #include "gc/shared/plab.hpp"
49 #include "gc/shared/stringdedup/stringDedup.hpp"
50 #include "gc/shared/tlab_globals.hpp"
51 #include "logging/log.hpp"
52 #include "logging/logStream.hpp"
53 #include "memory/metadataFactory.hpp"
54 #include "memory/metaspaceClosure.hpp"
55 #include "memory/metaspaceCounters.hpp"
56 #include "memory/metaspaceUtils.hpp"
57 #include "memory/oopFactory.hpp"
58 #include "memory/resourceArea.hpp"
59 #include "memory/universe.hpp"
60 #include "oops/compressedOops.hpp"
61 #include "oops/instanceKlass.hpp"
62 #include "oops/instanceMirrorKlass.hpp"
63 #include "oops/klass.inline.hpp"
64 #include "oops/objArrayOop.inline.hpp"
65 #include "oops/oop.inline.hpp"
66 #include "oops/oopHandle.inline.hpp"
67 #include "oops/typeArrayKlass.hpp"
68 #include "prims/resolvedMethodTable.hpp"
69 #include "runtime/arguments.hpp"
70 #include "runtime/atomic.hpp"
71 #include "runtime/cpuTimeCounters.hpp"
72 #include "runtime/flags/jvmFlagLimit.hpp"
73 #include "runtime/handles.inline.hpp"
74 #include "runtime/init.hpp"
75 #include "runtime/java.hpp"
76 #include "runtime/javaThread.hpp"
77 #include "runtime/jniHandles.hpp"
78 #include "runtime/threads.hpp"
79 #include "runtime/timerTrace.hpp"
80 #include "sanitizers/leak.hpp"
81 #include "services/memoryService.hpp"
82 #include "utilities/align.hpp"
83 #include "utilities/autoRestore.hpp"
84 #include "utilities/debug.hpp"
85 #include "utilities/formatBuffer.hpp"
86 #include "utilities/macros.hpp"
87 #include "utilities/ostream.hpp"
88 #include "utilities/preserveException.hpp"
89
90 // A helper class for caching a Method* when the user of the cache
91 // only cares about the latest version of the Method*. This cache safely
92 // interacts with the RedefineClasses API.
93 class LatestMethodCache {
94 // We save the InstanceKlass* and the idnum of Method* in order to get
95 // the current Method*.
96 InstanceKlass* _klass;
97 int _method_idnum;
98
99 public:
100 LatestMethodCache() { _klass = nullptr; _method_idnum = -1; }
101
102 void init(JavaThread* current, InstanceKlass* ik, const char* method,
103 Symbol* signature, bool is_static);
104 Method* get_method();
105 };
106
107 static LatestMethodCache _finalizer_register_cache; // Finalizer.register()
108 static LatestMethodCache _loader_addClass_cache; // ClassLoader.addClass()
109 static LatestMethodCache _throw_illegal_access_error_cache; // Unsafe.throwIllegalAccessError()
110 static LatestMethodCache _throw_no_such_method_error_cache; // Unsafe.throwNoSuchMethodError()
111 static LatestMethodCache _do_stack_walk_cache; // AbstractStackWalker.doStackWalk()
112
113 // Known objects
114 TypeArrayKlass* Universe::_typeArrayKlasses[T_LONG+1] = { nullptr /*, nullptr...*/ };
115 ObjArrayKlass* Universe::_objectArrayKlass = nullptr;
116 Klass* Universe::_fillerArrayKlass = nullptr;
117 OopHandle Universe::_basic_type_mirrors[T_VOID+1];
118 #if INCLUDE_CDS_JAVA_HEAP
119 int Universe::_archived_basic_type_mirror_indices[T_VOID+1];
120 #endif
121
122 OopHandle Universe::_main_thread_group;
123 OopHandle Universe::_system_thread_group;
124 OopHandle Universe::_the_empty_class_array;
125 OopHandle Universe::_the_null_string;
126 OopHandle Universe::_the_min_jint_string;
127
128 OopHandle Universe::_the_null_sentinel;
129
130 // _out_of_memory_errors is an objArray
131 enum OutOfMemoryInstance { _oom_java_heap,
132 _oom_c_heap,
133 _oom_metaspace,
134 _oom_class_metaspace,
135 _oom_array_size,
136 _oom_gc_overhead_limit,
137 _oom_realloc_objects,
138 _oom_count };
139
140 OopHandle Universe::_out_of_memory_errors;
141 OopHandle Universe:: _class_init_stack_overflow_error;
142 OopHandle Universe::_delayed_stack_overflow_error_message;
143 OopHandle Universe::_preallocated_out_of_memory_error_array;
144 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
145
146 // Message details for OOME objects, preallocate these objects since they could be
147 // used when throwing OOME, we should try to avoid further allocation in such case
148 OopHandle Universe::_msg_metaspace;
149 OopHandle Universe::_msg_class_metaspace;
150
151 OopHandle Universe::_reference_pending_list;
152
153 Array<Klass*>* Universe::_the_array_interfaces_array = nullptr;
154
155 long Universe::verify_flags = Universe::Verify_All;
156
157 Array<int>* Universe::_the_empty_int_array = nullptr;
158 Array<u2>* Universe::_the_empty_short_array = nullptr;
159 Array<Klass*>* Universe::_the_empty_klass_array = nullptr;
160 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = nullptr;
161 Array<Method*>* Universe::_the_empty_method_array = nullptr;
162
163 uintx Universe::_the_array_interfaces_bitmap = 0;
164 uintx Universe::_the_empty_klass_bitmap = 0;
165
166 // These variables are guarded by FullGCALot_lock.
167 debug_only(OopHandle Universe::_fullgc_alot_dummy_array;)
168 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
169
170 // Heap
171 int Universe::_verify_count = 0;
172
173 // Oop verification (see MacroAssembler::verify_oop)
174 uintptr_t Universe::_verify_oop_mask = 0;
175 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
176
177 int Universe::_base_vtable_size = 0;
178 bool Universe::_bootstrapping = false;
179 bool Universe::_module_initialized = false;
180 bool Universe::_fully_initialized = false;
181
182 OopStorage* Universe::_vm_weak = nullptr;
183 OopStorage* Universe::_vm_global = nullptr;
184
185 CollectedHeap* Universe::_collectedHeap = nullptr;
186
187 // These are the exceptions that are always created and are guatanteed to exist.
188 // If possible, they can be stored as CDS archived objects to speed up AOT code.
189 class BuiltinException {
190 OopHandle _instance;
191 CDS_JAVA_HEAP_ONLY(int _archived_root_index;)
192
193 public:
194 BuiltinException() : _instance() {
195 CDS_JAVA_HEAP_ONLY(_archived_root_index = 0);
196 }
197
198 void init_if_empty(Symbol* symbol, TRAPS) {
199 if (_instance.is_empty()) {
200 Klass* k = SystemDictionary::resolve_or_fail(symbol, true, CHECK);
201 oop obj = InstanceKlass::cast(k)->allocate_instance(CHECK);
202 _instance = OopHandle(Universe::vm_global(), obj);
203 }
204 }
205
206 oop instance() {
207 return _instance.resolve();
208 }
209
210 #if INCLUDE_CDS_JAVA_HEAP
211 void store_in_cds() {
212 _archived_root_index = HeapShared::archive_exception_instance(instance());
213 }
214
215 void load_from_cds() {
216 if (_archived_root_index >= 0) {
217 oop obj = HeapShared::get_root(_archived_root_index);
218 assert(obj != nullptr, "must be");
219 _instance = OopHandle(Universe::vm_global(), obj);
220 }
221 }
222
223 void serialize(SerializeClosure *f) {
224 f->do_int(&_archived_root_index);
225 }
226 #endif
227 };
228
229 static BuiltinException _null_ptr_exception;
230 static BuiltinException _arithmetic_exception;
231 static BuiltinException _internal_error;
232 static BuiltinException _array_index_out_of_bounds_exception;
233 static BuiltinException _array_store_exception;
234 static BuiltinException _class_cast_exception;
235
236 objArrayOop Universe::the_empty_class_array () {
237 return (objArrayOop)_the_empty_class_array.resolve();
238 }
239
240 oop Universe::main_thread_group() { return _main_thread_group.resolve(); }
241 void Universe::set_main_thread_group(oop group) { _main_thread_group = OopHandle(vm_global(), group); }
242
243 oop Universe::system_thread_group() { return _system_thread_group.resolve(); }
244 void Universe::set_system_thread_group(oop group) { _system_thread_group = OopHandle(vm_global(), group); }
245
246 oop Universe::the_null_string() { return _the_null_string.resolve(); }
247 oop Universe::the_min_jint_string() { return _the_min_jint_string.resolve(); }
248
249 oop Universe::null_ptr_exception_instance() { return _null_ptr_exception.instance(); }
250 oop Universe::arithmetic_exception_instance() { return _arithmetic_exception.instance(); }
251 oop Universe::internal_error_instance() { return _internal_error.instance(); }
252 oop Universe::array_index_out_of_bounds_exception_instance() { return _array_index_out_of_bounds_exception.instance(); }
253 oop Universe::array_store_exception_instance() { return _array_store_exception.instance(); }
254 oop Universe::class_cast_exception_instance() { return _class_cast_exception.instance(); }
255
256 oop Universe::the_null_sentinel() { return _the_null_sentinel.resolve(); }
257
258 oop Universe::int_mirror() { return check_mirror(_basic_type_mirrors[T_INT].resolve()); }
259 oop Universe::float_mirror() { return check_mirror(_basic_type_mirrors[T_FLOAT].resolve()); }
260 oop Universe::double_mirror() { return check_mirror(_basic_type_mirrors[T_DOUBLE].resolve()); }
261 oop Universe::byte_mirror() { return check_mirror(_basic_type_mirrors[T_BYTE].resolve()); }
262 oop Universe::bool_mirror() { return check_mirror(_basic_type_mirrors[T_BOOLEAN].resolve()); }
263 oop Universe::char_mirror() { return check_mirror(_basic_type_mirrors[T_CHAR].resolve()); }
264 oop Universe::long_mirror() { return check_mirror(_basic_type_mirrors[T_LONG].resolve()); }
265 oop Universe::short_mirror() { return check_mirror(_basic_type_mirrors[T_SHORT].resolve()); }
266 oop Universe::void_mirror() { return check_mirror(_basic_type_mirrors[T_VOID].resolve()); }
267
268 oop Universe::java_mirror(BasicType t) {
269 assert((uint)t < T_VOID+1, "range check");
270 assert(!is_reference_type(t), "sanity");
271 return check_mirror(_basic_type_mirrors[t].resolve());
272 }
273
274 void Universe::basic_type_classes_do(KlassClosure *closure) {
275 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
276 closure->do_klass(_typeArrayKlasses[i]);
277 }
278 // We don't do the following because it will confuse JVMTI.
279 // _fillerArrayKlass is used only by GC, which doesn't need to see
280 // this klass from basic_type_classes_do().
281 //
282 // closure->do_klass(_fillerArrayKlass);
283 }
284
285 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
286 it->push(&_fillerArrayKlass);
287 for (int i = 0; i < T_LONG+1; i++) {
288 it->push(&_typeArrayKlasses[i]);
289 }
290 it->push(&_objectArrayKlass);
291
292 it->push(&_the_empty_int_array);
293 it->push(&_the_empty_short_array);
294 it->push(&_the_empty_klass_array);
295 it->push(&_the_empty_instance_klass_array);
296 it->push(&_the_empty_method_array);
297 it->push(&_the_array_interfaces_array);
298 }
299
300 #if INCLUDE_CDS_JAVA_HEAP
301 void Universe::set_archived_basic_type_mirror_index(BasicType t, int index) {
302 assert(CDSConfig::is_dumping_heap(), "sanity");
303 assert(!is_reference_type(t), "sanity");
304 _archived_basic_type_mirror_indices[t] = index;
305 }
306
307 void Universe::archive_exception_instances() {
308 _null_ptr_exception.store_in_cds();
309 _arithmetic_exception.store_in_cds();
310 _internal_error.store_in_cds();
311 _array_index_out_of_bounds_exception.store_in_cds();
312 _array_store_exception.store_in_cds();
313 _class_cast_exception.store_in_cds();
314 }
315
316 void Universe::load_archived_object_instances() {
317 if (ArchiveHeapLoader::is_in_use()) {
318 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
319 int index = _archived_basic_type_mirror_indices[i];
320 if (!is_reference_type((BasicType)i) && index >= 0) {
321 oop mirror_oop = HeapShared::get_root(index);
322 assert(mirror_oop != nullptr, "must be");
323 _basic_type_mirrors[i] = OopHandle(vm_global(), mirror_oop);
324 }
325 }
326
327 _null_ptr_exception.load_from_cds();
328 _arithmetic_exception.load_from_cds();
329 _internal_error.load_from_cds();
330 _array_index_out_of_bounds_exception.load_from_cds();
331 _array_store_exception.load_from_cds();
332 _class_cast_exception.load_from_cds();
333 }
334 }
335 #endif
336
337 void Universe::serialize(SerializeClosure* f) {
338
339 #if INCLUDE_CDS_JAVA_HEAP
340 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
341 f->do_int(&_archived_basic_type_mirror_indices[i]);
342 // if f->reading(): We can't call HeapShared::get_root() yet, as the heap
343 // contents may need to be relocated. _basic_type_mirrors[i] will be
344 // updated later in Universe::load_archived_object_instances().
345 }
346 _null_ptr_exception.serialize(f);
347 _arithmetic_exception.serialize(f);
348 _internal_error.serialize(f);
349 _array_index_out_of_bounds_exception.serialize(f);
350 _array_store_exception.serialize(f);
351 _class_cast_exception.serialize(f);
352 #endif
353
354 f->do_ptr(&_fillerArrayKlass);
355 for (int i = 0; i < T_LONG+1; i++) {
356 f->do_ptr(&_typeArrayKlasses[i]);
357 }
358
359 f->do_ptr(&_objectArrayKlass);
360 f->do_ptr(&_the_array_interfaces_array);
361 f->do_ptr(&_the_empty_int_array);
362 f->do_ptr(&_the_empty_short_array);
363 f->do_ptr(&_the_empty_method_array);
364 f->do_ptr(&_the_empty_klass_array);
365 f->do_ptr(&_the_empty_instance_klass_array);
366 }
367
368
369 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
370 if (size < alignment || size % alignment != 0) {
371 vm_exit_during_initialization(
372 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
373 }
374 }
375
376 static void initialize_basic_type_klass(Klass* k, TRAPS) {
377 Klass* ok = vmClasses::Object_klass();
378 #if INCLUDE_CDS
379 if (CDSConfig::is_using_archive()) {
380 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
381 assert(k->super() == ok, "u3");
382 if (k->is_instance_klass()) {
383 InstanceKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), nullptr, CHECK);
384 } else {
385 ArrayKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), CHECK);
386 }
387 } else
388 #endif
389 {
390 k->initialize_supers(ok, nullptr, CHECK);
391 }
392 k->append_to_sibling_list();
393 }
394
395 void Universe::genesis(TRAPS) {
396 ResourceMark rm(THREAD);
397 HandleMark hm(THREAD);
398
399 // Explicit null checks are needed if these offsets are not smaller than the page size
400 if (UseCompactObjectHeaders) {
401 assert(oopDesc::mark_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()),
402 "Mark offset is expected to be less than the page size");
403 } else {
404 assert(oopDesc::klass_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()),
405 "Klass offset is expected to be less than the page size");
406 }
407 assert(arrayOopDesc::length_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()),
408 "Array length offset is expected to be less than the page size");
409
410 { AutoModifyRestore<bool> temporarily(_bootstrapping, true);
411
412 java_lang_Class::allocate_fixup_lists();
413
414 // determine base vtable size; without that we cannot create the array klasses
415 compute_base_vtable_size();
416
417 if (!CDSConfig::is_using_archive()) {
418 // Initialization of the fillerArrayKlass must come before regular
419 // int-TypeArrayKlass so that the int-Array mirror points to the
420 // int-TypeArrayKlass.
421 _fillerArrayKlass = TypeArrayKlass::create_klass(T_INT, "[Ljdk/internal/vm/FillerElement;", CHECK);
422 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
423 _typeArrayKlasses[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK);
424 }
425
426 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
427
428 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, nullptr, CHECK);
429 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
430 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
431 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
432 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
433 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK);
434 }
435
436 vmSymbols::initialize();
437
438 SystemDictionary::initialize(CHECK);
439
440 // Create string constants
441 oop s = StringTable::intern("null", CHECK);
442 _the_null_string = OopHandle(vm_global(), s);
443 s = StringTable::intern("-2147483648", CHECK);
444 _the_min_jint_string = OopHandle(vm_global(), s);
445
446
447 #if INCLUDE_CDS
448 if (CDSConfig::is_using_archive()) {
449 // Verify shared interfaces array.
450 assert(_the_array_interfaces_array->at(0) ==
451 vmClasses::Cloneable_klass(), "u3");
452 assert(_the_array_interfaces_array->at(1) ==
453 vmClasses::Serializable_klass(), "u3");
454 } else
455 #endif
456 {
457 // Set up shared interfaces array. (Do this before supers are set up.)
458 _the_array_interfaces_array->at_put(0, vmClasses::Cloneable_klass());
459 _the_array_interfaces_array->at_put(1, vmClasses::Serializable_klass());
460 }
461
462 _the_array_interfaces_bitmap = Klass::compute_secondary_supers_bitmap(_the_array_interfaces_array);
463 _the_empty_klass_bitmap = Klass::compute_secondary_supers_bitmap(_the_empty_klass_array);
464
465 initialize_basic_type_klass(_fillerArrayKlass, CHECK);
466
467 initialize_basic_type_klass(boolArrayKlass(), CHECK);
468 initialize_basic_type_klass(charArrayKlass(), CHECK);
469 initialize_basic_type_klass(floatArrayKlass(), CHECK);
470 initialize_basic_type_klass(doubleArrayKlass(), CHECK);
471 initialize_basic_type_klass(byteArrayKlass(), CHECK);
472 initialize_basic_type_klass(shortArrayKlass(), CHECK);
473 initialize_basic_type_klass(intArrayKlass(), CHECK);
474 initialize_basic_type_klass(longArrayKlass(), CHECK);
475
476 assert(_fillerArrayKlass != intArrayKlass(),
477 "Internal filler array klass should be different to int array Klass");
478 } // end of core bootstrapping
479
480 {
481 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
482 _the_null_sentinel = OopHandle(vm_global(), tns());
483 }
484
485 // Create a handle for reference_pending_list
486 _reference_pending_list = OopHandle(vm_global(), nullptr);
487
488 // Maybe this could be lifted up now that object array can be initialized
489 // during the bootstrapping.
490
491 // OLD
492 // Initialize _objectArrayKlass after core bootstraping to make
493 // sure the super class is set up properly for _objectArrayKlass.
494 // ---
495 // NEW
496 // Since some of the old system object arrays have been converted to
497 // ordinary object arrays, _objectArrayKlass will be loaded when
498 // SystemDictionary::initialize(CHECK); is run. See the extra check
499 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
500 {
501 Klass* oak = vmClasses::Object_klass()->array_klass(CHECK);
502 _objectArrayKlass = ObjArrayKlass::cast(oak);
503 }
504 // OLD
505 // Add the class to the class hierarchy manually to make sure that
506 // its vtable is initialized after core bootstrapping is completed.
507 // ---
508 // New
509 // Have already been initialized.
510 _objectArrayKlass->append_to_sibling_list();
511
512 #ifdef ASSERT
513 if (FullGCALot) {
514 // Allocate an array of dummy objects.
515 // We'd like these to be at the bottom of the old generation,
516 // so that when we free one and then collect,
517 // (almost) the whole heap moves
518 // and we find out if we actually update all the oops correctly.
519 // But we can't allocate directly in the old generation,
520 // so we allocate wherever, and hope that the first collection
521 // moves these objects to the bottom of the old generation.
522 int size = FullGCALotDummies * 2;
523
524 objArrayOop naked_array = oopFactory::new_objArray(vmClasses::Object_klass(), size, CHECK);
525 objArrayHandle dummy_array(THREAD, naked_array);
526 int i = 0;
527 while (i < size) {
528 // Allocate dummy in old generation
529 oop dummy = vmClasses::Object_klass()->allocate_instance(CHECK);
530 dummy_array->obj_at_put(i++, dummy);
531 }
532 {
533 // Only modify the global variable inside the mutex.
534 // If we had a race to here, the other dummy_array instances
535 // and their elements just get dropped on the floor, which is fine.
536 MutexLocker ml(THREAD, FullGCALot_lock);
537 if (_fullgc_alot_dummy_array.is_empty()) {
538 _fullgc_alot_dummy_array = OopHandle(vm_global(), dummy_array());
539 }
540 }
541 assert(i == ((objArrayOop)_fullgc_alot_dummy_array.resolve())->length(), "just checking");
542 }
543 #endif
544 }
545
546 void Universe::initialize_basic_type_mirrors(TRAPS) {
547 #if INCLUDE_CDS_JAVA_HEAP
548 if (CDSConfig::is_using_archive() &&
549 ArchiveHeapLoader::is_in_use() &&
550 _basic_type_mirrors[T_INT].resolve() != nullptr) {
551 assert(ArchiveHeapLoader::can_use(), "Sanity");
552
553 // check that all basic type mirrors are mapped also
554 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
555 if (!is_reference_type((BasicType)i)) {
556 oop m = _basic_type_mirrors[i].resolve();
557 assert(m != nullptr, "archived mirrors should not be null");
558 }
559 }
560 } else
561 // _basic_type_mirrors[T_INT], etc, are null if archived heap is not mapped.
562 #endif
563 {
564 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
565 BasicType bt = (BasicType)i;
566 if (!is_reference_type(bt)) {
567 oop m = java_lang_Class::create_basic_type_mirror(type2name(bt), bt, CHECK);
568 _basic_type_mirrors[i] = OopHandle(vm_global(), m);
569 }
570 CDS_JAVA_HEAP_ONLY(_archived_basic_type_mirror_indices[i] = -1);
571 }
572 }
573 if (CDSConfig::is_dumping_heap()) {
574 HeapShared::init_scratch_objects(CHECK);
575 }
576 }
577
578 void Universe::fixup_mirrors(TRAPS) {
579 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
580 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
581 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
582 // that the number of objects allocated at this point is very small.
583 assert(vmClasses::Class_klass_loaded(), "java.lang.Class should be loaded");
584 HandleMark hm(THREAD);
585
586 if (!CDSConfig::is_using_archive()) {
587 // Cache the start of the static fields
588 InstanceMirrorKlass::init_offset_of_static_fields();
589 }
590
591 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
592 int list_length = list->length();
593 for (int i = 0; i < list_length; i++) {
594 Klass* k = list->at(i);
595 assert(k->is_klass(), "List should only hold classes");
596 java_lang_Class::fixup_mirror(k, CATCH);
597 }
598 delete java_lang_Class::fixup_mirror_list();
599 java_lang_Class::set_fixup_mirror_list(nullptr);
600 }
601
602 #define assert_pll_locked(test) \
603 assert(Heap_lock->test(), "Reference pending list access requires lock")
604
605 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
606
607 oop Universe::reference_pending_list() {
608 if (Thread::current()->is_VM_thread()) {
609 assert_pll_locked(is_locked);
610 } else {
611 assert_pll_ownership();
612 }
613 return _reference_pending_list.resolve();
614 }
615
616 void Universe::clear_reference_pending_list() {
617 assert_pll_ownership();
618 _reference_pending_list.replace(nullptr);
619 }
620
621 bool Universe::has_reference_pending_list() {
622 assert_pll_ownership();
623 return _reference_pending_list.peek() != nullptr;
624 }
625
626 oop Universe::swap_reference_pending_list(oop list) {
627 assert_pll_locked(is_locked);
628 return _reference_pending_list.xchg(list);
629 }
630
631 #undef assert_pll_locked
632 #undef assert_pll_ownership
633
634 static void reinitialize_vtables() {
635 // The vtables are initialized by starting at java.lang.Object and
636 // initializing through the subclass links, so that the super
637 // classes are always initialized first.
638 for (ClassHierarchyIterator iter(vmClasses::Object_klass()); !iter.done(); iter.next()) {
639 Klass* sub = iter.klass();
640 sub->vtable().initialize_vtable();
641 }
642 }
643
644 static void reinitialize_itables() {
645
646 class ReinitTableClosure : public KlassClosure {
647 public:
648 void do_klass(Klass* k) {
649 if (k->is_instance_klass()) {
650 InstanceKlass::cast(k)->itable().initialize_itable();
651 }
652 }
653 };
654
655 MutexLocker mcld(ClassLoaderDataGraph_lock);
656 ReinitTableClosure cl;
657 ClassLoaderDataGraph::classes_do(&cl);
658 }
659
660 bool Universe::on_page_boundary(void* addr) {
661 return is_aligned(addr, os::vm_page_size());
662 }
663
664 // the array of preallocated errors with backtraces
665 objArrayOop Universe::preallocated_out_of_memory_errors() {
666 return (objArrayOop)_preallocated_out_of_memory_error_array.resolve();
667 }
668
669 objArrayOop Universe::out_of_memory_errors() { return (objArrayOop)_out_of_memory_errors.resolve(); }
670
671 oop Universe::out_of_memory_error_java_heap() {
672 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_java_heap));
673 }
674
675 oop Universe::out_of_memory_error_java_heap_without_backtrace() {
676 return out_of_memory_errors()->obj_at(_oom_java_heap);
677 }
678
679 oop Universe::out_of_memory_error_c_heap() {
680 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_c_heap));
681 }
682
683 oop Universe::out_of_memory_error_metaspace() {
684 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_metaspace));
685 }
686
687 oop Universe::out_of_memory_error_class_metaspace() {
688 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_class_metaspace));
689 }
690
691 oop Universe::out_of_memory_error_array_size() {
692 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_array_size));
693 }
694
695 oop Universe::out_of_memory_error_gc_overhead_limit() {
696 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_gc_overhead_limit));
697 }
698
699 oop Universe::out_of_memory_error_realloc_objects() {
700 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_realloc_objects));
701 }
702
703 oop Universe::class_init_out_of_memory_error() { return out_of_memory_errors()->obj_at(_oom_java_heap); }
704 oop Universe::class_init_stack_overflow_error() { return _class_init_stack_overflow_error.resolve(); }
705 oop Universe::delayed_stack_overflow_error_message() { return _delayed_stack_overflow_error_message.resolve(); }
706
707
708 bool Universe::should_fill_in_stack_trace(Handle throwable) {
709 // never attempt to fill in the stack trace of preallocated errors that do not have
710 // backtrace. These errors are kept alive forever and may be "re-used" when all
711 // preallocated errors with backtrace have been consumed. Also need to avoid
712 // a potential loop which could happen if an out of memory occurs when attempting
713 // to allocate the backtrace.
714 objArrayOop preallocated_oom = out_of_memory_errors();
715 for (int i = 0; i < _oom_count; i++) {
716 if (throwable() == preallocated_oom->obj_at(i)) {
717 return false;
718 }
719 }
720 return true;
721 }
722
723
724 oop Universe::gen_out_of_memory_error(oop default_err) {
725 // generate an out of memory error:
726 // - if there is a preallocated error and stack traces are available
727 // (j.l.Throwable is initialized), then return the preallocated
728 // error with a filled in stack trace, and with the message
729 // provided by the default error.
730 // - otherwise, return the default error, without a stack trace.
731 int next;
732 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
733 vmClasses::Throwable_klass()->is_initialized()) {
734 next = (int)Atomic::add(&_preallocated_out_of_memory_error_avail_count, -1);
735 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
736 } else {
737 next = -1;
738 }
739 if (next < 0) {
740 // all preallocated errors have been used.
741 // return default
742 return default_err;
743 } else {
744 JavaThread* current = JavaThread::current();
745 Handle default_err_h(current, default_err);
746 // get the error object at the slot and set set it to null so that the
747 // array isn't keeping it alive anymore.
748 Handle exc(current, preallocated_out_of_memory_errors()->obj_at(next));
749 assert(exc() != nullptr, "slot has been used already");
750 preallocated_out_of_memory_errors()->obj_at_put(next, nullptr);
751
752 // use the message from the default error
753 oop msg = java_lang_Throwable::message(default_err_h());
754 assert(msg != nullptr, "no message");
755 java_lang_Throwable::set_message(exc(), msg);
756
757 // populate the stack trace and return it.
758 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
759 return exc();
760 }
761 }
762
763 bool Universe::is_out_of_memory_error_metaspace(oop ex_obj) {
764 return java_lang_Throwable::message(ex_obj) == _msg_metaspace.resolve();
765 }
766
767 bool Universe::is_out_of_memory_error_class_metaspace(oop ex_obj) {
768 return java_lang_Throwable::message(ex_obj) == _msg_class_metaspace.resolve();
769 }
770
771 // Setup preallocated OutOfMemoryError errors
772 void Universe::create_preallocated_out_of_memory_errors(TRAPS) {
773 InstanceKlass* ik = vmClasses::OutOfMemoryError_klass();
774 objArrayOop oa = oopFactory::new_objArray(ik, _oom_count, CHECK);
775 objArrayHandle oom_array(THREAD, oa);
776
777 for (int i = 0; i < _oom_count; i++) {
778 oop oom_obj = ik->allocate_instance(CHECK);
779 oom_array->obj_at_put(i, oom_obj);
780 }
781 _out_of_memory_errors = OopHandle(vm_global(), oom_array());
782
783 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK);
784 java_lang_Throwable::set_message(oom_array->obj_at(_oom_java_heap), msg());
785
786 msg = java_lang_String::create_from_str("C heap space", CHECK);
787 java_lang_Throwable::set_message(oom_array->obj_at(_oom_c_heap), msg());
788
789 msg = java_lang_String::create_from_str("Metaspace", CHECK);
790 _msg_metaspace = OopHandle(vm_global(), msg());
791 java_lang_Throwable::set_message(oom_array->obj_at(_oom_metaspace), msg());
792
793 msg = java_lang_String::create_from_str("Compressed class space", CHECK);
794 _msg_class_metaspace = OopHandle(vm_global(), msg());
795 java_lang_Throwable::set_message(oom_array->obj_at(_oom_class_metaspace), msg());
796
797 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK);
798 java_lang_Throwable::set_message(oom_array->obj_at(_oom_array_size), msg());
799
800 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK);
801 java_lang_Throwable::set_message(oom_array->obj_at(_oom_gc_overhead_limit), msg());
802
803 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK);
804 java_lang_Throwable::set_message(oom_array->obj_at(_oom_realloc_objects), msg());
805
806 // Setup the array of errors that have preallocated backtrace
807 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
808 objArrayOop instance = oopFactory::new_objArray(ik, len, CHECK);
809 _preallocated_out_of_memory_error_array = OopHandle(vm_global(), instance);
810 objArrayHandle preallocated_oom_array(THREAD, instance);
811
812 for (int i=0; i<len; i++) {
813 oop err = ik->allocate_instance(CHECK);
814 Handle err_h(THREAD, err);
815 java_lang_Throwable::allocate_backtrace(err_h, CHECK);
816 preallocated_oom_array->obj_at_put(i, err_h());
817 }
818 _preallocated_out_of_memory_error_avail_count = (jint)len;
819 }
820
821 intptr_t Universe::_non_oop_bits = 0;
822
823 void* Universe::non_oop_word() {
824 // Neither the high bits nor the low bits of this value is allowed
825 // to look like (respectively) the high or low bits of a real oop.
826 //
827 // High and low are CPU-specific notions, but low always includes
828 // the low-order bit. Since oops are always aligned at least mod 4,
829 // setting the low-order bit will ensure that the low half of the
830 // word will never look like that of a real oop.
831 //
832 // Using the OS-supplied non-memory-address word (usually 0 or -1)
833 // will take care of the high bits, however many there are.
834
835 if (_non_oop_bits == 0) {
836 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
837 }
838
839 return (void*)_non_oop_bits;
840 }
841
842 bool Universe::contains_non_oop_word(void* p) {
843 return *(void**)p == non_oop_word();
844 }
845
846 static void initialize_global_behaviours() {
847 DefaultICProtectionBehaviour* protection_behavior = new DefaultICProtectionBehaviour();
848 // Ignore leak of DefaultICProtectionBehaviour. It is overriden by some GC implementations and the
849 // pointer is leaked once.
850 LSAN_IGNORE_OBJECT(protection_behavior);
851 CompiledICProtectionBehaviour::set_current(protection_behavior);
852 }
853
854 jint universe_init() {
855 assert(!Universe::_fully_initialized, "called after initialize_vtables");
856 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
857 "LogHeapWordSize is incorrect.");
858 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
859 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
860 "oop size is not not a multiple of HeapWord size");
861
862 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
863
864 initialize_global_behaviours();
865
866 GCLogPrecious::initialize();
867
868 // Initialize CPUTimeCounters object, which must be done before creation of the heap.
869 CPUTimeCounters::initialize();
870
871 #ifdef _LP64
872 MetaspaceShared::adjust_heap_sizes_for_dumping();
873 #endif // _LP64
874
875 GCConfig::arguments()->initialize_heap_sizes();
876
877 jint status = Universe::initialize_heap();
878 if (status != JNI_OK) {
879 return status;
880 }
881
882 Universe::initialize_tlab();
883
884 Metaspace::global_initialize();
885
886 // Initialize performance counters for metaspaces
887 MetaspaceCounters::initialize_performance_counters();
888
889 // Checks 'AfterMemoryInit' constraints.
890 if (!JVMFlagLimit::check_all_constraints(JVMFlagConstraintPhase::AfterMemoryInit)) {
891 return JNI_EINVAL;
892 }
893
894 ClassLoaderData::init_null_class_loader_data();
895
896 #if INCLUDE_CDS
897 DynamicArchive::check_for_dynamic_dump();
898 if (CDSConfig::is_using_archive()) {
899 // Read the data structures supporting the shared spaces (shared
900 // system dictionary, symbol table, etc.)
901 MetaspaceShared::initialize_shared_spaces();
902 }
903 if (CDSConfig::is_dumping_archive()) {
904 MetaspaceShared::prepare_for_dumping();
905 }
906 #endif
907
908 SymbolTable::create_table();
909 StringTable::create_table();
910
911 if (strlen(VerifySubSet) > 0) {
912 Universe::initialize_verify_flags();
913 }
914
915 ResolvedMethodTable::create_table();
916
917 return JNI_OK;
918 }
919
920 jint Universe::initialize_heap() {
921 assert(_collectedHeap == nullptr, "Heap already created");
922 _collectedHeap = GCConfig::arguments()->create_heap();
923
924 log_info(gc)("Using %s", _collectedHeap->name());
925 return _collectedHeap->initialize();
926 }
927
928 void Universe::initialize_tlab() {
929 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
930 PLAB::startup_initialization();
931 if (UseTLAB) {
932 ThreadLocalAllocBuffer::startup_initialization();
933 }
934 }
935
936 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
937
938 assert(alignment <= Arguments::conservative_max_heap_alignment(),
939 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
940 alignment, Arguments::conservative_max_heap_alignment());
941
942 size_t total_reserved = align_up(heap_size, alignment);
943 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
944 "heap size is too big for compressed oops");
945
946 size_t page_size = os::vm_page_size();
947 if (UseLargePages && is_aligned(alignment, os::large_page_size())) {
948 page_size = os::large_page_size();
949 } else {
950 // Parallel is the only collector that might opt out of using large pages
951 // for the heap.
952 assert(!UseLargePages || UseParallelGC , "Wrong alignment to use large pages");
953 }
954
955 // Now create the space.
956 ReservedHeapSpace total_rs(total_reserved, alignment, page_size, AllocateHeapAt);
957
958 if (total_rs.is_reserved()) {
959 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
960 "must be exactly of required size and alignment");
961 // We are good.
962
963 if (AllocateHeapAt != nullptr) {
964 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
965 }
966
967 if (UseCompressedOops) {
968 CompressedOops::initialize(total_rs);
969 }
970
971 Universe::calculate_verify_data((HeapWord*)total_rs.base(), (HeapWord*)total_rs.end());
972
973 return total_rs;
974 }
975
976 vm_exit_during_initialization(
977 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
978 total_reserved/K));
979
980 // satisfy compiler
981 ShouldNotReachHere();
982 return ReservedHeapSpace(0, 0, os::vm_page_size());
983 }
984
985 OopStorage* Universe::vm_weak() {
986 return Universe::_vm_weak;
987 }
988
989 OopStorage* Universe::vm_global() {
990 return Universe::_vm_global;
991 }
992
993 void Universe::oopstorage_init() {
994 Universe::_vm_global = OopStorageSet::create_strong("VM Global", mtInternal);
995 Universe::_vm_weak = OopStorageSet::create_weak("VM Weak", mtInternal);
996 }
997
998 void universe_oopstorage_init() {
999 Universe::oopstorage_init();
1000 }
1001
1002 void LatestMethodCache::init(JavaThread* current, InstanceKlass* ik,
1003 const char* method, Symbol* signature, bool is_static)
1004 {
1005 TempNewSymbol name = SymbolTable::new_symbol(method);
1006 Method* m = nullptr;
1007 // The klass must be linked before looking up the method.
1008 if (!ik->link_class_or_fail(current) ||
1009 ((m = ik->find_method(name, signature)) == nullptr) ||
1010 is_static != m->is_static()) {
1011 ResourceMark rm(current);
1012 // NoSuchMethodException doesn't actually work because it tries to run the
1013 // <init> function before java_lang_Class is linked. Print error and exit.
1014 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
1015 ik->name()->as_C_string(), method));
1016 }
1017
1018 _klass = ik;
1019 _method_idnum = m->method_idnum();
1020 assert(_method_idnum >= 0, "sanity check");
1021 }
1022
1023 Method* LatestMethodCache::get_method() {
1024 if (_klass == nullptr) {
1025 return nullptr;
1026 } else {
1027 Method* m = _klass->method_with_idnum(_method_idnum);
1028 assert(m != nullptr, "sanity check");
1029 return m;
1030 }
1031 }
1032
1033 Method* Universe::finalizer_register_method() { return _finalizer_register_cache.get_method(); }
1034 Method* Universe::loader_addClass_method() { return _loader_addClass_cache.get_method(); }
1035 Method* Universe::throw_illegal_access_error() { return _throw_illegal_access_error_cache.get_method(); }
1036 Method* Universe::throw_no_such_method_error() { return _throw_no_such_method_error_cache.get_method(); }
1037 Method* Universe::do_stack_walk_method() { return _do_stack_walk_cache.get_method(); }
1038
1039 void Universe::initialize_known_methods(JavaThread* current) {
1040 // Set up static method for registering finalizers
1041 _finalizer_register_cache.init(current,
1042 vmClasses::Finalizer_klass(),
1043 "register",
1044 vmSymbols::object_void_signature(), true);
1045
1046 _throw_illegal_access_error_cache.init(current,
1047 vmClasses::internal_Unsafe_klass(),
1048 "throwIllegalAccessError",
1049 vmSymbols::void_method_signature(), true);
1050
1051 _throw_no_such_method_error_cache.init(current,
1052 vmClasses::internal_Unsafe_klass(),
1053 "throwNoSuchMethodError",
1054 vmSymbols::void_method_signature(), true);
1055
1056 // Set up method for registering loaded classes in class loader vector
1057 _loader_addClass_cache.init(current,
1058 vmClasses::ClassLoader_klass(),
1059 "addClass",
1060 vmSymbols::class_void_signature(), false);
1061
1062 // Set up method for stack walking
1063 _do_stack_walk_cache.init(current,
1064 vmClasses::AbstractStackWalker_klass(),
1065 "doStackWalk",
1066 vmSymbols::doStackWalk_signature(), false);
1067 }
1068
1069 void universe2_init() {
1070 EXCEPTION_MARK;
1071 Universe::genesis(CATCH);
1072 }
1073
1074 // Set after initialization of the module runtime, call_initModuleRuntime
1075 void universe_post_module_init() {
1076 Universe::_module_initialized = true;
1077 }
1078
1079 bool universe_post_init() {
1080 assert(!is_init_completed(), "Error: initialization not yet completed!");
1081 Universe::_fully_initialized = true;
1082 EXCEPTION_MARK;
1083 if (!CDSConfig::is_using_archive()) {
1084 reinitialize_vtables();
1085 reinitialize_itables();
1086 }
1087
1088 HandleMark hm(THREAD);
1089 // Setup preallocated empty java.lang.Class array for Method reflection.
1090
1091 objArrayOop the_empty_class_array = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_false);
1092 Universe::_the_empty_class_array = OopHandle(Universe::vm_global(), the_empty_class_array);
1093
1094 // Setup preallocated OutOfMemoryError errors
1095 Universe::create_preallocated_out_of_memory_errors(CHECK_false);
1096
1097 oop instance;
1098 // Setup preallocated cause message for delayed StackOverflowError
1099 if (StackReservedPages > 0) {
1100 instance = java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
1101 Universe::_delayed_stack_overflow_error_message = OopHandle(Universe::vm_global(), instance);
1102 }
1103
1104 // Setup preallocated exceptions used for a cheap & dirty solution in compiler exception handling
1105 _null_ptr_exception.init_if_empty(vmSymbols::java_lang_NullPointerException(), CHECK_false);
1106 _arithmetic_exception.init_if_empty(vmSymbols::java_lang_ArithmeticException(), CHECK_false);
1107 _array_index_out_of_bounds_exception.init_if_empty(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), CHECK_false);
1108 _array_store_exception.init_if_empty(vmSymbols::java_lang_ArrayStoreException(), CHECK_false);
1109 _class_cast_exception.init_if_empty(vmSymbols::java_lang_ClassCastException(), CHECK_false);
1110
1111 // Virtual Machine Error for when we get into a situation we can't resolve
1112 Klass* k = vmClasses::InternalError_klass();
1113 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1114 if (!linked) {
1115 tty->print_cr("Unable to link/verify InternalError class");
1116 return false; // initialization failed
1117 }
1118 _internal_error.init_if_empty(vmSymbols::java_lang_InternalError(), CHECK_false);
1119
1120 Handle msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1121 java_lang_Throwable::set_message(Universe::arithmetic_exception_instance(), msg());
1122
1123 // Setup preallocated StackOverflowError for use with class initialization failure
1124 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_StackOverflowError(), true, CHECK_false);
1125 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1126 Universe::_class_init_stack_overflow_error = OopHandle(Universe::vm_global(), instance);
1127
1128 Universe::initialize_known_methods(THREAD);
1129
1130 // This needs to be done before the first scavenge/gc, since
1131 // it's an input to soft ref clearing policy.
1132 {
1133 MutexLocker x(THREAD, Heap_lock);
1134 Universe::heap()->update_capacity_and_used_at_gc();
1135 }
1136
1137 // ("weak") refs processing infrastructure initialization
1138 Universe::heap()->post_initialize();
1139
1140 MemoryService::add_metaspace_memory_pools();
1141
1142 MemoryService::set_universe_heap(Universe::heap());
1143 #if INCLUDE_CDS
1144 MetaspaceShared::post_initialize(CHECK_false);
1145 #endif
1146 return true;
1147 }
1148
1149
1150 void Universe::compute_base_vtable_size() {
1151 _base_vtable_size = ClassLoader::compute_Object_vtable();
1152 }
1153
1154 void Universe::print_on(outputStream* st) {
1155 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1156 st->print_cr("Heap");
1157 heap()->print_on(st);
1158 }
1159
1160 void Universe::print_heap_at_SIGBREAK() {
1161 if (PrintHeapAtSIGBREAK) {
1162 print_on(tty);
1163 tty->cr();
1164 tty->flush();
1165 }
1166 }
1167
1168 void Universe::initialize_verify_flags() {
1169 verify_flags = 0;
1170 const char delimiter[] = " ,";
1171
1172 size_t length = strlen(VerifySubSet);
1173 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1174 strncpy(subset_list, VerifySubSet, length + 1);
1175 char* save_ptr;
1176
1177 char* token = strtok_r(subset_list, delimiter, &save_ptr);
1178 while (token != nullptr) {
1179 if (strcmp(token, "threads") == 0) {
1180 verify_flags |= Verify_Threads;
1181 } else if (strcmp(token, "heap") == 0) {
1182 verify_flags |= Verify_Heap;
1183 } else if (strcmp(token, "symbol_table") == 0) {
1184 verify_flags |= Verify_SymbolTable;
1185 } else if (strcmp(token, "string_table") == 0) {
1186 verify_flags |= Verify_StringTable;
1187 } else if (strcmp(token, "codecache") == 0) {
1188 verify_flags |= Verify_CodeCache;
1189 } else if (strcmp(token, "dictionary") == 0) {
1190 verify_flags |= Verify_SystemDictionary;
1191 } else if (strcmp(token, "classloader_data_graph") == 0) {
1192 verify_flags |= Verify_ClassLoaderDataGraph;
1193 } else if (strcmp(token, "metaspace") == 0) {
1194 verify_flags |= Verify_MetaspaceUtils;
1195 } else if (strcmp(token, "jni_handles") == 0) {
1196 verify_flags |= Verify_JNIHandles;
1197 } else if (strcmp(token, "codecache_oops") == 0) {
1198 verify_flags |= Verify_CodeCacheOops;
1199 } else if (strcmp(token, "resolved_method_table") == 0) {
1200 verify_flags |= Verify_ResolvedMethodTable;
1201 } else if (strcmp(token, "stringdedup") == 0) {
1202 verify_flags |= Verify_StringDedup;
1203 } else {
1204 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1205 }
1206 token = strtok_r(nullptr, delimiter, &save_ptr);
1207 }
1208 FREE_C_HEAP_ARRAY(char, subset_list);
1209 }
1210
1211 bool Universe::should_verify_subset(uint subset) {
1212 if (verify_flags & subset) {
1213 return true;
1214 }
1215 return false;
1216 }
1217
1218 void Universe::verify(VerifyOption option, const char* prefix) {
1219 COMPILER2_PRESENT(
1220 assert(!DerivedPointerTable::is_active(),
1221 "DPT should not be active during verification "
1222 "(of thread stacks below)");
1223 )
1224
1225 Thread* thread = Thread::current();
1226 ResourceMark rm(thread);
1227 HandleMark hm(thread); // Handles created during verification can be zapped
1228 _verify_count++;
1229
1230 FormatBuffer<> title("Verifying %s", prefix);
1231 GCTraceTime(Info, gc, verify) tm(title.buffer());
1232 if (should_verify_subset(Verify_Threads)) {
1233 log_debug(gc, verify)("Threads");
1234 Threads::verify();
1235 }
1236 if (should_verify_subset(Verify_Heap)) {
1237 log_debug(gc, verify)("Heap");
1238 heap()->verify(option);
1239 }
1240 if (should_verify_subset(Verify_SymbolTable)) {
1241 log_debug(gc, verify)("SymbolTable");
1242 SymbolTable::verify();
1243 }
1244 if (should_verify_subset(Verify_StringTable)) {
1245 log_debug(gc, verify)("StringTable");
1246 StringTable::verify();
1247 }
1248 if (should_verify_subset(Verify_CodeCache)) {
1249 log_debug(gc, verify)("CodeCache");
1250 CodeCache::verify();
1251 }
1252 if (should_verify_subset(Verify_SystemDictionary)) {
1253 log_debug(gc, verify)("SystemDictionary");
1254 SystemDictionary::verify();
1255 }
1256 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1257 log_debug(gc, verify)("ClassLoaderDataGraph");
1258 ClassLoaderDataGraph::verify();
1259 }
1260 if (should_verify_subset(Verify_MetaspaceUtils)) {
1261 log_debug(gc, verify)("MetaspaceUtils");
1262 DEBUG_ONLY(MetaspaceUtils::verify();)
1263 }
1264 if (should_verify_subset(Verify_JNIHandles)) {
1265 log_debug(gc, verify)("JNIHandles");
1266 JNIHandles::verify();
1267 }
1268 if (should_verify_subset(Verify_CodeCacheOops)) {
1269 log_debug(gc, verify)("CodeCache Oops");
1270 CodeCache::verify_oops();
1271 }
1272 if (should_verify_subset(Verify_ResolvedMethodTable)) {
1273 log_debug(gc, verify)("ResolvedMethodTable Oops");
1274 ResolvedMethodTable::verify();
1275 }
1276 if (should_verify_subset(Verify_StringDedup)) {
1277 log_debug(gc, verify)("String Deduplication");
1278 StringDedup::verify();
1279 }
1280 }
1281
1282
1283 #ifndef PRODUCT
1284 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1285 assert(low_boundary < high_boundary, "bad interval");
1286
1287 // decide which low-order bits we require to be clear:
1288 size_t alignSize = MinObjAlignmentInBytes;
1289 size_t min_object_size = CollectedHeap::min_fill_size();
1290
1291 // make an inclusive limit:
1292 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1293 uintptr_t min = (uintptr_t)low_boundary;
1294 assert(min < max, "bad interval");
1295 uintptr_t diff = max ^ min;
1296
1297 // throw away enough low-order bits to make the diff vanish
1298 uintptr_t mask = (uintptr_t)(-1);
1299 while ((mask & diff) != 0)
1300 mask <<= 1;
1301 uintptr_t bits = (min & mask);
1302 assert(bits == (max & mask), "correct mask");
1303 // check an intermediate value between min and max, just to make sure:
1304 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1305
1306 // require address alignment, too:
1307 mask |= (alignSize - 1);
1308
1309 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1310 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1311 }
1312 _verify_oop_mask = mask;
1313 _verify_oop_bits = bits;
1314 }
1315
1316 void Universe::set_verify_data(uintptr_t mask, uintptr_t bits) {
1317 _verify_oop_mask = mask;
1318 _verify_oop_bits = bits;
1319 }
1320
1321 // Oop verification (see MacroAssembler::verify_oop)
1322
1323 uintptr_t Universe::verify_oop_mask() {
1324 return _verify_oop_mask;
1325 }
1326
1327 uintptr_t Universe::verify_oop_bits() {
1328 return _verify_oop_bits;
1329 }
1330
1331 uintptr_t Universe::verify_mark_mask() {
1332 return markWord::lock_mask_in_place;
1333 }
1334
1335 uintptr_t Universe::verify_mark_bits() {
1336 intptr_t mask = verify_mark_mask();
1337 intptr_t bits = (intptr_t)markWord::prototype().value();
1338 assert((bits & ~mask) == 0, "no stray header bits");
1339 return bits;
1340 }
1341 #endif // PRODUCT
1342
1343 #ifdef ASSERT
1344 // Release dummy object(s) at bottom of heap
1345 bool Universe::release_fullgc_alot_dummy() {
1346 MutexLocker ml(FullGCALot_lock);
1347 objArrayOop fullgc_alot_dummy_array = (objArrayOop)_fullgc_alot_dummy_array.resolve();
1348 if (fullgc_alot_dummy_array != nullptr) {
1349 if (_fullgc_alot_dummy_next >= fullgc_alot_dummy_array->length()) {
1350 // No more dummies to release, release entire array instead
1351 _fullgc_alot_dummy_array.release(Universe::vm_global());
1352 _fullgc_alot_dummy_array = OopHandle(); // null out OopStorage pointer.
1353 return false;
1354 }
1355
1356 // Release dummy at bottom of old generation
1357 fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, nullptr);
1358 }
1359 return true;
1360 }
1361
1362 bool Universe::is_stw_gc_active() {
1363 return heap()->is_stw_gc_active();
1364 }
1365
1366 bool Universe::is_in_heap(const void* p) {
1367 return heap()->is_in(p);
1368 }
1369
1370 #endif // ASSERT