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