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