1 /*
2 * Copyright (c) 1997, 2023, 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/dynamicArchive.hpp"
28 #include "cds/heapShared.hpp"
29 #include "cds/metaspaceShared.hpp"
30 #include "classfile/classLoader.hpp"
31 #include "classfile/classLoaderDataGraph.hpp"
32 #include "classfile/javaClasses.hpp"
33 #include "classfile/stringTable.hpp"
34 #include "classfile/symbolTable.hpp"
35 #include "classfile/systemDictionary.hpp"
36 #include "classfile/vmClasses.hpp"
37 #include "classfile/vmSymbols.hpp"
38 #include "code/codeBehaviours.hpp"
39 #include "code/codeCache.hpp"
40 #include "compiler/oopMap.hpp"
41 #include "gc/shared/collectedHeap.inline.hpp"
42 #include "gc/shared/gcArguments.hpp"
43 #include "gc/shared/gcConfig.hpp"
44 #include "gc/shared/gcLogPrecious.hpp"
45 #include "gc/shared/gcTraceTime.inline.hpp"
46 #include "gc/shared/oopStorageSet.hpp"
47 #include "gc/shared/plab.hpp"
48 #include "gc/shared/stringdedup/stringDedup.hpp"
49 #include "gc/shared/tlab_globals.hpp"
50 #include "logging/log.hpp"
51 #include "logging/logStream.hpp"
52 #include "memory/metadataFactory.hpp"
53 #include "memory/metaspaceClosure.hpp"
54 #include "memory/metaspaceCounters.hpp"
55 #include "memory/metaspaceUtils.hpp"
56 #include "memory/oopFactory.hpp"
57 #include "memory/resourceArea.hpp"
58 #include "memory/universe.hpp"
59 #include "oops/compressedOops.hpp"
60 #include "oops/instanceKlass.hpp"
61 #include "oops/instanceMirrorKlass.hpp"
62 #include "oops/klass.inline.hpp"
63 #include "oops/objArrayOop.inline.hpp"
64 #include "oops/oop.inline.hpp"
65 #include "oops/oopHandle.inline.hpp"
66 #include "oops/typeArrayKlass.hpp"
67 #include "prims/resolvedMethodTable.hpp"
68 #include "runtime/arguments.hpp"
69 #include "runtime/atomic.hpp"
70 #include "runtime/flags/jvmFlagLimit.hpp"
71 #include "runtime/handles.inline.hpp"
72 #include "runtime/init.hpp"
73 #include "runtime/java.hpp"
74 #include "runtime/javaThread.hpp"
75 #include "runtime/jniHandles.hpp"
76 #include "runtime/threads.hpp"
77 #include "runtime/timerTrace.hpp"
78 #include "sanitizers/leak.hpp"
79 #include "services/memoryService.hpp"
80 #include "utilities/align.hpp"
81 #include "utilities/autoRestore.hpp"
82 #include "utilities/debug.hpp"
83 #include "utilities/formatBuffer.hpp"
84 #include "utilities/macros.hpp"
85 #include "utilities/ostream.hpp"
86 #include "utilities/preserveException.hpp"
87
88 // Known objects
89 Klass* Universe::_typeArrayKlassObjs[T_LONG+1] = { nullptr /*, nullptr...*/ };
90 Klass* Universe::_objectArrayKlassObj = nullptr;
91 Klass* Universe::_fillerArrayKlassObj = nullptr;
92 OopHandle Universe::_basic_type_mirrors[T_VOID+1];
93 #if INCLUDE_CDS_JAVA_HEAP
94 int Universe::_archived_basic_type_mirror_indices[T_VOID+1];
95 #endif
96
97 OopHandle Universe::_main_thread_group;
98 OopHandle Universe::_system_thread_group;
99 OopHandle Universe::_the_empty_class_array;
100 OopHandle Universe::_the_null_string;
101 OopHandle Universe::_the_min_jint_string;
102
103 OopHandle Universe::_the_null_sentinel;
104
105 // _out_of_memory_errors is an objArray
106 enum OutOfMemoryInstance { _oom_java_heap,
107 _oom_c_heap,
108 _oom_metaspace,
109 _oom_class_metaspace,
110 _oom_array_size,
111 _oom_gc_overhead_limit,
112 _oom_realloc_objects,
113 _oom_retry,
114 _oom_count };
115
116 OopHandle Universe::_out_of_memory_errors;
117 OopHandle Universe::_delayed_stack_overflow_error_message;
118 OopHandle Universe::_preallocated_out_of_memory_error_array;
119 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
120
121 // Message details for OOME objects, preallocate these objects since they could be
122 // used when throwing OOME, we should try to avoid further allocation in such case
123 OopHandle Universe::_msg_metaspace;
124 OopHandle Universe::_msg_class_metaspace;
125
126 OopHandle Universe::_null_ptr_exception_instance;
127 OopHandle Universe::_arithmetic_exception_instance;
128 OopHandle Universe::_virtual_machine_error_instance;
129
130 OopHandle Universe::_reference_pending_list;
131
132 Array<Klass*>* Universe::_the_array_interfaces_array = nullptr;
133 LatestMethodCache* Universe::_finalizer_register_cache = nullptr;
134 LatestMethodCache* Universe::_loader_addClass_cache = nullptr;
135 LatestMethodCache* Universe::_throw_illegal_access_error_cache = nullptr;
136 LatestMethodCache* Universe::_throw_no_such_method_error_cache = nullptr;
137 LatestMethodCache* Universe::_do_stack_walk_cache = nullptr;
138
139 long Universe::verify_flags = Universe::Verify_All;
140
141 Array<int>* Universe::_the_empty_int_array = nullptr;
142 Array<u2>* Universe::_the_empty_short_array = nullptr;
143 Array<Klass*>* Universe::_the_empty_klass_array = nullptr;
144 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = nullptr;
145 Array<Method*>* Universe::_the_empty_method_array = nullptr;
146
147 // These variables are guarded by FullGCALot_lock.
148 debug_only(OopHandle Universe::_fullgc_alot_dummy_array;)
149 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
150
151 // Heap
152 int Universe::_verify_count = 0;
153
154 // Oop verification (see MacroAssembler::verify_oop)
155 uintptr_t Universe::_verify_oop_mask = 0;
156 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
157
158 int Universe::_base_vtable_size = 0;
159 bool Universe::_bootstrapping = false;
160 bool Universe::_module_initialized = false;
161 bool Universe::_fully_initialized = false;
162
163 OopStorage* Universe::_vm_weak = nullptr;
164 OopStorage* Universe::_vm_global = nullptr;
165
166 CollectedHeap* Universe::_collectedHeap = nullptr;
167
168 objArrayOop Universe::the_empty_class_array () {
169 return (objArrayOop)_the_empty_class_array.resolve();
170 }
171
172 oop Universe::main_thread_group() { return _main_thread_group.resolve(); }
173 void Universe::set_main_thread_group(oop group) { _main_thread_group = OopHandle(vm_global(), group); }
174
175 oop Universe::system_thread_group() { return _system_thread_group.resolve(); }
176 void Universe::set_system_thread_group(oop group) { _system_thread_group = OopHandle(vm_global(), group); }
177
178 oop Universe::the_null_string() { return _the_null_string.resolve(); }
179 oop Universe::the_min_jint_string() { return _the_min_jint_string.resolve(); }
180
181 oop Universe::null_ptr_exception_instance() { return _null_ptr_exception_instance.resolve(); }
182 oop Universe::arithmetic_exception_instance() { return _arithmetic_exception_instance.resolve(); }
183 oop Universe::virtual_machine_error_instance() { return _virtual_machine_error_instance.resolve(); }
184
185 oop Universe::the_null_sentinel() { return _the_null_sentinel.resolve(); }
186
187 oop Universe::int_mirror() { return check_mirror(_basic_type_mirrors[T_INT].resolve()); }
188 oop Universe::float_mirror() { return check_mirror(_basic_type_mirrors[T_FLOAT].resolve()); }
189 oop Universe::double_mirror() { return check_mirror(_basic_type_mirrors[T_DOUBLE].resolve()); }
190 oop Universe::byte_mirror() { return check_mirror(_basic_type_mirrors[T_BYTE].resolve()); }
191 oop Universe::bool_mirror() { return check_mirror(_basic_type_mirrors[T_BOOLEAN].resolve()); }
192 oop Universe::char_mirror() { return check_mirror(_basic_type_mirrors[T_CHAR].resolve()); }
193 oop Universe::long_mirror() { return check_mirror(_basic_type_mirrors[T_LONG].resolve()); }
194 oop Universe::short_mirror() { return check_mirror(_basic_type_mirrors[T_SHORT].resolve()); }
195 oop Universe::void_mirror() { return check_mirror(_basic_type_mirrors[T_VOID].resolve()); }
196
197 oop Universe::java_mirror(BasicType t) {
198 assert((uint)t < T_VOID+1, "range check");
199 assert(!is_reference_type(t), "sanity");
200 return check_mirror(_basic_type_mirrors[t].resolve());
201 }
202
203 void Universe::basic_type_classes_do(KlassClosure *closure) {
204 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
205 closure->do_klass(_typeArrayKlassObjs[i]);
206 }
207 // We don't do the following because it will confuse JVMTI.
208 // _fillerArrayKlassObj is used only by GC, which doesn't need to see
209 // this klass from basic_type_classes_do().
210 //
211 // closure->do_klass(_fillerArrayKlassObj);
212 }
213
214 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
215 it->push(&_klass);
216 }
217
218 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
219 it->push(&_fillerArrayKlassObj);
220 for (int i = 0; i < T_LONG+1; i++) {
221 it->push(&_typeArrayKlassObjs[i]);
222 }
223 it->push(&_objectArrayKlassObj);
224
225 it->push(&_the_empty_int_array);
226 it->push(&_the_empty_short_array);
227 it->push(&_the_empty_klass_array);
228 it->push(&_the_empty_instance_klass_array);
229 it->push(&_the_empty_method_array);
230 it->push(&_the_array_interfaces_array);
231
232 _finalizer_register_cache->metaspace_pointers_do(it);
233 _loader_addClass_cache->metaspace_pointers_do(it);
234 _throw_illegal_access_error_cache->metaspace_pointers_do(it);
235 _throw_no_such_method_error_cache->metaspace_pointers_do(it);
236 _do_stack_walk_cache->metaspace_pointers_do(it);
237 }
238
239 #if INCLUDE_CDS_JAVA_HEAP
240 void Universe::set_archived_basic_type_mirror_index(BasicType t, int index) {
241 assert(DumpSharedSpaces, "dump-time only");
242 assert(!is_reference_type(t), "sanity");
243 _archived_basic_type_mirror_indices[t] = index;
244 }
245
246 void Universe::update_archived_basic_type_mirrors() {
247 if (ArchiveHeapLoader::is_in_use()) {
248 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
249 int index = _archived_basic_type_mirror_indices[i];
250 if (!is_reference_type((BasicType)i) && index >= 0) {
251 oop mirror_oop = HeapShared::get_root(index);
252 assert(mirror_oop != nullptr, "must be");
253 _basic_type_mirrors[i] = OopHandle(vm_global(), mirror_oop);
254 }
255 }
256 }
257 }
258 #endif
259
260 void Universe::serialize(SerializeClosure* f) {
261
262 #if INCLUDE_CDS_JAVA_HEAP
263 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
264 f->do_int(&_archived_basic_type_mirror_indices[i]);
265 // if f->reading(): We can't call HeapShared::get_root() yet, as the heap
266 // contents may need to be relocated. _basic_type_mirrors[i] will be
267 // updated later in Universe::update_archived_basic_type_mirrors().
268 }
269 #endif
270
271 f->do_ptr(&_fillerArrayKlassObj);
272 for (int i = 0; i < T_LONG+1; i++) {
273 f->do_ptr(&_typeArrayKlassObjs[i]);
274 }
275
276 f->do_ptr(&_objectArrayKlassObj);
277 f->do_ptr(&_the_array_interfaces_array);
278 f->do_ptr(&_the_empty_int_array);
279 f->do_ptr(&_the_empty_short_array);
280 f->do_ptr(&_the_empty_method_array);
281 f->do_ptr(&_the_empty_klass_array);
282 f->do_ptr(&_the_empty_instance_klass_array);
283 _finalizer_register_cache->serialize(f);
284 _loader_addClass_cache->serialize(f);
285 _throw_illegal_access_error_cache->serialize(f);
286 _throw_no_such_method_error_cache->serialize(f);
287 _do_stack_walk_cache->serialize(f);
288 }
289
290
291 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
292 if (size < alignment || size % alignment != 0) {
293 vm_exit_during_initialization(
294 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
295 }
296 }
297
298 void initialize_basic_type_klass(Klass* k, TRAPS) {
299 Klass* ok = vmClasses::Object_klass();
300 #if INCLUDE_CDS
301 if (UseSharedSpaces) {
302 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
303 assert(k->super() == ok, "u3");
304 if (k->is_instance_klass()) {
305 InstanceKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), nullptr, CHECK);
306 } else {
307 ArrayKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), CHECK);
308 }
309 } else
310 #endif
311 {
312 k->initialize_supers(ok, nullptr, CHECK);
313 }
314 k->append_to_sibling_list();
315 }
316
317 void Universe::genesis(TRAPS) {
318 ResourceMark rm(THREAD);
319 HandleMark hm(THREAD);
320
321 // Explicit null checks are needed if these offsets are not smaller than the page size
322 if (UseCompactObjectHeaders) {
323 assert(oopDesc::mark_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()),
324 "Mark offset is expected to be less than the page size");
325 } else {
326 assert(oopDesc::klass_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()),
327 "Klass offset is expected to be less than the page size");
328 }
329 assert(arrayOopDesc::length_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()),
330 "Array length offset is expected to be less than the page size");
331
332 { AutoModifyRestore<bool> temporarily(_bootstrapping, true);
333
334 java_lang_Class::allocate_fixup_lists();
335
336 // determine base vtable size; without that we cannot create the array klasses
337 compute_base_vtable_size();
338
339 if (!UseSharedSpaces) {
340 // Initialization of the fillerArrayKlass must come before regular
341 // int-TypeArrayKlass so that the int-Array mirror points to the
342 // int-TypeArrayKlass.
343 _fillerArrayKlassObj = TypeArrayKlass::create_klass(T_INT, "[Ljdk/internal/vm/FillerElement;", CHECK);
344 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
345 _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK);
346 }
347
348 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
349
350 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, nullptr, CHECK);
351 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
352 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
353 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
354 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
355 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK);
356 }
357
358 vmSymbols::initialize();
359
360 SystemDictionary::initialize(CHECK);
361
362 // Create string constants
363 oop s = StringTable::intern("null", CHECK);
364 _the_null_string = OopHandle(vm_global(), s);
365 s = StringTable::intern("-2147483648", CHECK);
366 _the_min_jint_string = OopHandle(vm_global(), s);
367
368
369 #if INCLUDE_CDS
370 if (UseSharedSpaces) {
371 // Verify shared interfaces array.
372 assert(_the_array_interfaces_array->at(0) ==
373 vmClasses::Cloneable_klass(), "u3");
374 assert(_the_array_interfaces_array->at(1) ==
375 vmClasses::Serializable_klass(), "u3");
376 } else
377 #endif
378 {
379 // Set up shared interfaces array. (Do this before supers are set up.)
380 _the_array_interfaces_array->at_put(0, vmClasses::Cloneable_klass());
381 _the_array_interfaces_array->at_put(1, vmClasses::Serializable_klass());
382 }
383
384 initialize_basic_type_klass(_fillerArrayKlassObj, CHECK);
385
386 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
387 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
388 initialize_basic_type_klass(floatArrayKlassObj(), CHECK);
389 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
390 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
391 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
392 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
393 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
394
395 assert(_fillerArrayKlassObj != intArrayKlassObj(),
396 "Internal filler array klass should be different to int array Klass");
397 } // end of core bootstrapping
398
399 {
400 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
401 _the_null_sentinel = OopHandle(vm_global(), tns());
402 }
403
404 // Create a handle for reference_pending_list
405 _reference_pending_list = OopHandle(vm_global(), nullptr);
406
407 // Maybe this could be lifted up now that object array can be initialized
408 // during the bootstrapping.
409
410 // OLD
411 // Initialize _objectArrayKlass after core bootstraping to make
412 // sure the super class is set up properly for _objectArrayKlass.
413 // ---
414 // NEW
415 // Since some of the old system object arrays have been converted to
416 // ordinary object arrays, _objectArrayKlass will be loaded when
417 // SystemDictionary::initialize(CHECK); is run. See the extra check
418 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
419 _objectArrayKlassObj = InstanceKlass::
420 cast(vmClasses::Object_klass())->array_klass(1, CHECK);
421 // OLD
422 // Add the class to the class hierarchy manually to make sure that
423 // its vtable is initialized after core bootstrapping is completed.
424 // ---
425 // New
426 // Have already been initialized.
427 _objectArrayKlassObj->append_to_sibling_list();
428
429 #ifdef ASSERT
430 if (FullGCALot) {
431 // Allocate an array of dummy objects.
432 // We'd like these to be at the bottom of the old generation,
433 // so that when we free one and then collect,
434 // (almost) the whole heap moves
435 // and we find out if we actually update all the oops correctly.
436 // But we can't allocate directly in the old generation,
437 // so we allocate wherever, and hope that the first collection
438 // moves these objects to the bottom of the old generation.
439 int size = FullGCALotDummies * 2;
440
441 objArrayOop naked_array = oopFactory::new_objArray(vmClasses::Object_klass(), size, CHECK);
442 objArrayHandle dummy_array(THREAD, naked_array);
443 int i = 0;
444 while (i < size) {
445 // Allocate dummy in old generation
446 oop dummy = vmClasses::Object_klass()->allocate_instance(CHECK);
447 dummy_array->obj_at_put(i++, dummy);
448 }
449 {
450 // Only modify the global variable inside the mutex.
451 // If we had a race to here, the other dummy_array instances
452 // and their elements just get dropped on the floor, which is fine.
453 MutexLocker ml(THREAD, FullGCALot_lock);
454 if (_fullgc_alot_dummy_array.is_empty()) {
455 _fullgc_alot_dummy_array = OopHandle(vm_global(), dummy_array());
456 }
457 }
458 assert(i == ((objArrayOop)_fullgc_alot_dummy_array.resolve())->length(), "just checking");
459 }
460 #endif
461 }
462
463 void Universe::initialize_basic_type_mirrors(TRAPS) {
464 #if INCLUDE_CDS_JAVA_HEAP
465 if (UseSharedSpaces &&
466 ArchiveHeapLoader::is_in_use() &&
467 _basic_type_mirrors[T_INT].resolve() != nullptr) {
468 assert(ArchiveHeapLoader::can_use(), "Sanity");
469
470 // check that all basic type mirrors are mapped also
471 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
472 if (!is_reference_type((BasicType)i)) {
473 oop m = _basic_type_mirrors[i].resolve();
474 assert(m != nullptr, "archived mirrors should not be null");
475 }
476 }
477 } else
478 // _basic_type_mirrors[T_INT], etc, are null if archived heap is not mapped.
479 #endif
480 {
481 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
482 BasicType bt = (BasicType)i;
483 if (!is_reference_type(bt)) {
484 oop m = java_lang_Class::create_basic_type_mirror(type2name(bt), bt, CHECK);
485 _basic_type_mirrors[i] = OopHandle(vm_global(), m);
486 }
487 CDS_JAVA_HEAP_ONLY(_archived_basic_type_mirror_indices[i] = -1);
488 }
489 }
490 if (DumpSharedSpaces) {
491 HeapShared::init_scratch_objects(CHECK);
492 }
493 }
494
495 void Universe::fixup_mirrors(TRAPS) {
496 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
497 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
498 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
499 // that the number of objects allocated at this point is very small.
500 assert(vmClasses::Class_klass_loaded(), "java.lang.Class should be loaded");
501 HandleMark hm(THREAD);
502
503 if (!UseSharedSpaces) {
504 // Cache the start of the static fields
505 InstanceMirrorKlass::init_offset_of_static_fields();
506 }
507
508 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
509 int list_length = list->length();
510 for (int i = 0; i < list_length; i++) {
511 Klass* k = list->at(i);
512 assert(k->is_klass(), "List should only hold classes");
513 java_lang_Class::fixup_mirror(k, CATCH);
514 }
515 delete java_lang_Class::fixup_mirror_list();
516 java_lang_Class::set_fixup_mirror_list(nullptr);
517 }
518
519 #define assert_pll_locked(test) \
520 assert(Heap_lock->test(), "Reference pending list access requires lock")
521
522 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
523
524 oop Universe::reference_pending_list() {
525 if (Thread::current()->is_VM_thread()) {
526 assert_pll_locked(is_locked);
527 } else {
528 assert_pll_ownership();
529 }
530 return _reference_pending_list.resolve();
531 }
532
533 void Universe::clear_reference_pending_list() {
534 assert_pll_ownership();
535 _reference_pending_list.replace(nullptr);
536 }
537
538 bool Universe::has_reference_pending_list() {
539 assert_pll_ownership();
540 return _reference_pending_list.peek() != nullptr;
541 }
542
543 oop Universe::swap_reference_pending_list(oop list) {
544 assert_pll_locked(is_locked);
545 return _reference_pending_list.xchg(list);
546 }
547
548 #undef assert_pll_locked
549 #undef assert_pll_ownership
550
551 static void reinitialize_vtables() {
552 // The vtables are initialized by starting at java.lang.Object and
553 // initializing through the subclass links, so that the super
554 // classes are always initialized first.
555 for (ClassHierarchyIterator iter(vmClasses::Object_klass()); !iter.done(); iter.next()) {
556 Klass* sub = iter.klass();
557 sub->vtable().initialize_vtable();
558 }
559 }
560
561 static void reinitialize_itables() {
562
563 class ReinitTableClosure : public KlassClosure {
564 public:
565 void do_klass(Klass* k) {
566 if (k->is_instance_klass()) {
567 InstanceKlass::cast(k)->itable().initialize_itable();
568 }
569 }
570 };
571
572 MutexLocker mcld(ClassLoaderDataGraph_lock);
573 ReinitTableClosure cl;
574 ClassLoaderDataGraph::classes_do(&cl);
575 }
576
577 bool Universe::on_page_boundary(void* addr) {
578 return is_aligned(addr, os::vm_page_size());
579 }
580
581 // the array of preallocated errors with backtraces
582 objArrayOop Universe::preallocated_out_of_memory_errors() {
583 return (objArrayOop)_preallocated_out_of_memory_error_array.resolve();
584 }
585
586 objArrayOop Universe::out_of_memory_errors() { return (objArrayOop)_out_of_memory_errors.resolve(); }
587
588 oop Universe::out_of_memory_error_java_heap() {
589 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_java_heap));
590 }
591
592 oop Universe::out_of_memory_error_c_heap() {
593 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_c_heap));
594 }
595
596 oop Universe::out_of_memory_error_metaspace() {
597 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_metaspace));
598 }
599
600 oop Universe::out_of_memory_error_class_metaspace() {
601 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_class_metaspace));
602 }
603
604 oop Universe::out_of_memory_error_array_size() {
605 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_array_size));
606 }
607
608 oop Universe::out_of_memory_error_gc_overhead_limit() {
609 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_gc_overhead_limit));
610 }
611
612 oop Universe::out_of_memory_error_realloc_objects() {
613 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_realloc_objects));
614 }
615
616 // Throw default _out_of_memory_error_retry object as it will never propagate out of the VM
617 oop Universe::out_of_memory_error_retry() { return out_of_memory_errors()->obj_at(_oom_retry); }
618 oop Universe::delayed_stack_overflow_error_message() { return _delayed_stack_overflow_error_message.resolve(); }
619
620
621 bool Universe::should_fill_in_stack_trace(Handle throwable) {
622 // never attempt to fill in the stack trace of preallocated errors that do not have
623 // backtrace. These errors are kept alive forever and may be "re-used" when all
624 // preallocated errors with backtrace have been consumed. Also need to avoid
625 // a potential loop which could happen if an out of memory occurs when attempting
626 // to allocate the backtrace.
627 objArrayOop preallocated_oom = out_of_memory_errors();
628 for (int i = 0; i < _oom_count; i++) {
629 if (throwable() == preallocated_oom->obj_at(i)) {
630 return false;
631 }
632 }
633 return true;
634 }
635
636
637 oop Universe::gen_out_of_memory_error(oop default_err) {
638 // generate an out of memory error:
639 // - if there is a preallocated error and stack traces are available
640 // (j.l.Throwable is initialized), then return the preallocated
641 // error with a filled in stack trace, and with the message
642 // provided by the default error.
643 // - otherwise, return the default error, without a stack trace.
644 int next;
645 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
646 vmClasses::Throwable_klass()->is_initialized()) {
647 next = (int)Atomic::add(&_preallocated_out_of_memory_error_avail_count, -1);
648 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
649 } else {
650 next = -1;
651 }
652 if (next < 0) {
653 // all preallocated errors have been used.
654 // return default
655 return default_err;
656 } else {
657 JavaThread* current = JavaThread::current();
658 Handle default_err_h(current, default_err);
659 // get the error object at the slot and set set it to null so that the
660 // array isn't keeping it alive anymore.
661 Handle exc(current, preallocated_out_of_memory_errors()->obj_at(next));
662 assert(exc() != nullptr, "slot has been used already");
663 preallocated_out_of_memory_errors()->obj_at_put(next, nullptr);
664
665 // use the message from the default error
666 oop msg = java_lang_Throwable::message(default_err_h());
667 assert(msg != nullptr, "no message");
668 java_lang_Throwable::set_message(exc(), msg);
669
670 // populate the stack trace and return it.
671 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
672 return exc();
673 }
674 }
675
676 bool Universe::is_out_of_memory_error_metaspace(oop ex_obj) {
677 return java_lang_Throwable::message(ex_obj) == _msg_metaspace.resolve();
678 }
679
680 bool Universe::is_out_of_memory_error_class_metaspace(oop ex_obj) {
681 return java_lang_Throwable::message(ex_obj) == _msg_class_metaspace.resolve();
682 }
683
684 // Setup preallocated OutOfMemoryError errors
685 void Universe::create_preallocated_out_of_memory_errors(TRAPS) {
686 InstanceKlass* ik = vmClasses::OutOfMemoryError_klass();
687 objArrayOop oa = oopFactory::new_objArray(ik, _oom_count, CHECK);
688 objArrayHandle oom_array(THREAD, oa);
689
690 for (int i = 0; i < _oom_count; i++) {
691 oop oom_obj = ik->allocate_instance(CHECK);
692 oom_array->obj_at_put(i, oom_obj);
693 }
694 _out_of_memory_errors = OopHandle(vm_global(), oom_array());
695
696 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK);
697 java_lang_Throwable::set_message(oom_array->obj_at(_oom_java_heap), msg());
698
699 msg = java_lang_String::create_from_str("C heap space", CHECK);
700 java_lang_Throwable::set_message(oom_array->obj_at(_oom_c_heap), msg());
701
702 msg = java_lang_String::create_from_str("Metaspace", CHECK);
703 _msg_metaspace = OopHandle(vm_global(), msg());
704 java_lang_Throwable::set_message(oom_array->obj_at(_oom_metaspace), msg());
705
706 msg = java_lang_String::create_from_str("Compressed class space", CHECK);
707 _msg_class_metaspace = OopHandle(vm_global(), msg());
708 java_lang_Throwable::set_message(oom_array->obj_at(_oom_class_metaspace), msg());
709
710 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK);
711 java_lang_Throwable::set_message(oom_array->obj_at(_oom_array_size), msg());
712
713 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK);
714 java_lang_Throwable::set_message(oom_array->obj_at(_oom_gc_overhead_limit), msg());
715
716 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK);
717 java_lang_Throwable::set_message(oom_array->obj_at(_oom_realloc_objects), msg());
718
719 msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK);
720 java_lang_Throwable::set_message(oom_array->obj_at(_oom_retry), msg());
721
722 // Setup the array of errors that have preallocated backtrace
723 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
724 objArrayOop instance = oopFactory::new_objArray(ik, len, CHECK);
725 _preallocated_out_of_memory_error_array = OopHandle(vm_global(), instance);
726 objArrayHandle preallocated_oom_array(THREAD, instance);
727
728 for (int i=0; i<len; i++) {
729 oop err = ik->allocate_instance(CHECK);
730 Handle err_h(THREAD, err);
731 java_lang_Throwable::allocate_backtrace(err_h, CHECK);
732 preallocated_oom_array->obj_at_put(i, err_h());
733 }
734 _preallocated_out_of_memory_error_avail_count = (jint)len;
735 }
736
737 intptr_t Universe::_non_oop_bits = 0;
738
739 void* Universe::non_oop_word() {
740 // Neither the high bits nor the low bits of this value is allowed
741 // to look like (respectively) the high or low bits of a real oop.
742 //
743 // High and low are CPU-specific notions, but low always includes
744 // the low-order bit. Since oops are always aligned at least mod 4,
745 // setting the low-order bit will ensure that the low half of the
746 // word will never look like that of a real oop.
747 //
748 // Using the OS-supplied non-memory-address word (usually 0 or -1)
749 // will take care of the high bits, however many there are.
750
751 if (_non_oop_bits == 0) {
752 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
753 }
754
755 return (void*)_non_oop_bits;
756 }
757
758 bool Universe::contains_non_oop_word(void* p) {
759 return *(void**)p == non_oop_word();
760 }
761
762 static void initialize_global_behaviours() {
763 DefaultICProtectionBehaviour* protection_behavior = new DefaultICProtectionBehaviour();
764 // Ignore leak of DefaultICProtectionBehaviour. It is overriden by some GC implementations and the
765 // pointer is leaked once.
766 LSAN_IGNORE_OBJECT(protection_behavior);
767 CompiledICProtectionBehaviour::set_current(protection_behavior);
768 }
769
770 jint universe_init() {
771 assert(!Universe::_fully_initialized, "called after initialize_vtables");
772 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
773 "LogHeapWordSize is incorrect.");
774 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
775 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
776 "oop size is not not a multiple of HeapWord size");
777
778 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
779
780 initialize_global_behaviours();
781
782 GCLogPrecious::initialize();
783
784 #ifdef _LP64
785 MetaspaceShared::adjust_heap_sizes_for_dumping();
786 #endif // _LP64
787
788 GCConfig::arguments()->initialize_heap_sizes();
789
790 jint status = Universe::initialize_heap();
791 if (status != JNI_OK) {
792 return status;
793 }
794
795 Universe::initialize_tlab();
796
797 Metaspace::global_initialize();
798
799 // Initialize performance counters for metaspaces
800 MetaspaceCounters::initialize_performance_counters();
801
802 // Checks 'AfterMemoryInit' constraints.
803 if (!JVMFlagLimit::check_all_constraints(JVMFlagConstraintPhase::AfterMemoryInit)) {
804 return JNI_EINVAL;
805 }
806
807 // Create memory for metadata. Must be after initializing heap for
808 // DumpSharedSpaces.
809 ClassLoaderData::init_null_class_loader_data();
810
811 // We have a heap so create the Method* caches before
812 // Metaspace::initialize_shared_spaces() tries to populate them.
813 Universe::_finalizer_register_cache = new LatestMethodCache();
814 Universe::_loader_addClass_cache = new LatestMethodCache();
815 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
816 Universe::_throw_no_such_method_error_cache = new LatestMethodCache();
817 Universe::_do_stack_walk_cache = new LatestMethodCache();
818
819 #if INCLUDE_CDS
820 DynamicArchive::check_for_dynamic_dump();
821 if (UseSharedSpaces) {
822 // Read the data structures supporting the shared spaces (shared
823 // system dictionary, symbol table, etc.)
824 MetaspaceShared::initialize_shared_spaces();
825 }
826 if (Arguments::is_dumping_archive()) {
827 MetaspaceShared::prepare_for_dumping();
828 }
829 #endif
830
831 SymbolTable::create_table();
832 StringTable::create_table();
833
834 if (strlen(VerifySubSet) > 0) {
835 Universe::initialize_verify_flags();
836 }
837
838 ResolvedMethodTable::create_table();
839
840 return JNI_OK;
841 }
842
843 jint Universe::initialize_heap() {
844 assert(_collectedHeap == nullptr, "Heap already created");
845 _collectedHeap = GCConfig::arguments()->create_heap();
846
847 log_info(gc)("Using %s", _collectedHeap->name());
848 return _collectedHeap->initialize();
849 }
850
851 void Universe::initialize_tlab() {
852 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
853 PLAB::startup_initialization();
854 if (UseTLAB) {
855 ThreadLocalAllocBuffer::startup_initialization();
856 }
857 }
858
859 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
860
861 assert(alignment <= Arguments::conservative_max_heap_alignment(),
862 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
863 alignment, Arguments::conservative_max_heap_alignment());
864
865 size_t total_reserved = align_up(heap_size, alignment);
866 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
867 "heap size is too big for compressed oops");
868
869 size_t page_size = os::vm_page_size();
870 if (UseLargePages && is_aligned(alignment, os::large_page_size())) {
871 page_size = os::large_page_size();
872 } else {
873 // Parallel is the only collector that might opt out of using large pages
874 // for the heap.
875 assert(!UseLargePages || UseParallelGC , "Wrong alignment to use large pages");
876 }
877
878 // Now create the space.
879 ReservedHeapSpace total_rs(total_reserved, alignment, page_size, AllocateHeapAt);
880
881 if (total_rs.is_reserved()) {
882 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
883 "must be exactly of required size and alignment");
884 // We are good.
885
886 if (AllocateHeapAt != nullptr) {
887 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
888 }
889
890 if (UseCompressedOops) {
891 CompressedOops::initialize(total_rs);
892 }
893
894 Universe::calculate_verify_data((HeapWord*)total_rs.base(), (HeapWord*)total_rs.end());
895
896 return total_rs;
897 }
898
899 vm_exit_during_initialization(
900 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
901 total_reserved/K));
902
903 // satisfy compiler
904 ShouldNotReachHere();
905 return ReservedHeapSpace(0, 0, os::vm_page_size());
906 }
907
908 OopStorage* Universe::vm_weak() {
909 return Universe::_vm_weak;
910 }
911
912 OopStorage* Universe::vm_global() {
913 return Universe::_vm_global;
914 }
915
916 void Universe::oopstorage_init() {
917 Universe::_vm_global = OopStorageSet::create_strong("VM Global", mtInternal);
918 Universe::_vm_weak = OopStorageSet::create_weak("VM Weak", mtInternal);
919 }
920
921 void universe_oopstorage_init() {
922 Universe::oopstorage_init();
923 }
924
925 void initialize_known_method(LatestMethodCache* method_cache,
926 InstanceKlass* ik,
927 const char* method,
928 Symbol* signature,
929 bool is_static, TRAPS)
930 {
931 TempNewSymbol name = SymbolTable::new_symbol(method);
932 Method* m = nullptr;
933 // The klass must be linked before looking up the method.
934 if (!ik->link_class_or_fail(THREAD) ||
935 ((m = ik->find_method(name, signature)) == nullptr) ||
936 is_static != m->is_static()) {
937 ResourceMark rm(THREAD);
938 // NoSuchMethodException doesn't actually work because it tries to run the
939 // <init> function before java_lang_Class is linked. Print error and exit.
940 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
941 ik->name()->as_C_string(), method));
942 }
943 method_cache->init(ik, m);
944 }
945
946 void Universe::initialize_known_methods(TRAPS) {
947 // Set up static method for registering finalizers
948 initialize_known_method(_finalizer_register_cache,
949 vmClasses::Finalizer_klass(),
950 "register",
951 vmSymbols::object_void_signature(), true, CHECK);
952
953 initialize_known_method(_throw_illegal_access_error_cache,
954 vmClasses::internal_Unsafe_klass(),
955 "throwIllegalAccessError",
956 vmSymbols::void_method_signature(), true, CHECK);
957
958 initialize_known_method(_throw_no_such_method_error_cache,
959 vmClasses::internal_Unsafe_klass(),
960 "throwNoSuchMethodError",
961 vmSymbols::void_method_signature(), true, CHECK);
962
963 // Set up method for registering loaded classes in class loader vector
964 initialize_known_method(_loader_addClass_cache,
965 vmClasses::ClassLoader_klass(),
966 "addClass",
967 vmSymbols::class_void_signature(), false, CHECK);
968
969 // Set up method for stack walking
970 initialize_known_method(_do_stack_walk_cache,
971 vmClasses::AbstractStackWalker_klass(),
972 "doStackWalk",
973 vmSymbols::doStackWalk_signature(), false, CHECK);
974 }
975
976 void universe2_init() {
977 EXCEPTION_MARK;
978 Universe::genesis(CATCH);
979 }
980
981 // Set after initialization of the module runtime, call_initModuleRuntime
982 void universe_post_module_init() {
983 Universe::_module_initialized = true;
984 }
985
986 bool universe_post_init() {
987 assert(!is_init_completed(), "Error: initialization not yet completed!");
988 Universe::_fully_initialized = true;
989 EXCEPTION_MARK;
990 if (!UseSharedSpaces) {
991 reinitialize_vtables();
992 reinitialize_itables();
993 }
994
995 HandleMark hm(THREAD);
996 // Setup preallocated empty java.lang.Class array for Method reflection.
997
998 objArrayOop the_empty_class_array = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_false);
999 Universe::_the_empty_class_array = OopHandle(Universe::vm_global(), the_empty_class_array);
1000
1001 // Setup preallocated OutOfMemoryError errors
1002 Universe::create_preallocated_out_of_memory_errors(CHECK_false);
1003
1004 oop instance;
1005 // Setup preallocated cause message for delayed StackOverflowError
1006 if (StackReservedPages > 0) {
1007 instance = java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
1008 Universe::_delayed_stack_overflow_error_message = OopHandle(Universe::vm_global(), instance);
1009 }
1010
1011 // Setup preallocated NullPointerException
1012 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1013 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
1014 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1015 Universe::_null_ptr_exception_instance = OopHandle(Universe::vm_global(), instance);
1016
1017 // Setup preallocated ArithmeticException
1018 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1019 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
1020 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1021 Universe::_arithmetic_exception_instance = OopHandle(Universe::vm_global(), instance);
1022
1023 // Virtual Machine Error for when we get into a situation we can't resolve
1024 k = vmClasses::VirtualMachineError_klass();
1025 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1026 if (!linked) {
1027 tty->print_cr("Unable to link/verify VirtualMachineError class");
1028 return false; // initialization failed
1029 }
1030 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1031 Universe::_virtual_machine_error_instance = OopHandle(Universe::vm_global(), instance);
1032
1033 Handle msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1034 java_lang_Throwable::set_message(Universe::arithmetic_exception_instance(), msg());
1035
1036 Universe::initialize_known_methods(CHECK_false);
1037
1038 // This needs to be done before the first scavenge/gc, since
1039 // it's an input to soft ref clearing policy.
1040 {
1041 MutexLocker x(THREAD, Heap_lock);
1042 Universe::heap()->update_capacity_and_used_at_gc();
1043 }
1044
1045 // ("weak") refs processing infrastructure initialization
1046 Universe::heap()->post_initialize();
1047
1048 MemoryService::add_metaspace_memory_pools();
1049
1050 MemoryService::set_universe_heap(Universe::heap());
1051 #if INCLUDE_CDS
1052 MetaspaceShared::post_initialize(CHECK_false);
1053 #endif
1054 return true;
1055 }
1056
1057
1058 void Universe::compute_base_vtable_size() {
1059 _base_vtable_size = ClassLoader::compute_Object_vtable();
1060 }
1061
1062 void Universe::print_on(outputStream* st) {
1063 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1064 st->print_cr("Heap");
1065 heap()->print_on(st);
1066 }
1067
1068 void Universe::print_heap_at_SIGBREAK() {
1069 if (PrintHeapAtSIGBREAK) {
1070 print_on(tty);
1071 tty->cr();
1072 tty->flush();
1073 }
1074 }
1075
1076 void Universe::initialize_verify_flags() {
1077 verify_flags = 0;
1078 const char delimiter[] = " ,";
1079
1080 size_t length = strlen(VerifySubSet);
1081 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1082 strncpy(subset_list, VerifySubSet, length + 1);
1083 char* save_ptr;
1084
1085 char* token = strtok_r(subset_list, delimiter, &save_ptr);
1086 while (token != nullptr) {
1087 if (strcmp(token, "threads") == 0) {
1088 verify_flags |= Verify_Threads;
1089 } else if (strcmp(token, "heap") == 0) {
1090 verify_flags |= Verify_Heap;
1091 } else if (strcmp(token, "symbol_table") == 0) {
1092 verify_flags |= Verify_SymbolTable;
1093 } else if (strcmp(token, "string_table") == 0) {
1094 verify_flags |= Verify_StringTable;
1095 } else if (strcmp(token, "codecache") == 0) {
1096 verify_flags |= Verify_CodeCache;
1097 } else if (strcmp(token, "dictionary") == 0) {
1098 verify_flags |= Verify_SystemDictionary;
1099 } else if (strcmp(token, "classloader_data_graph") == 0) {
1100 verify_flags |= Verify_ClassLoaderDataGraph;
1101 } else if (strcmp(token, "metaspace") == 0) {
1102 verify_flags |= Verify_MetaspaceUtils;
1103 } else if (strcmp(token, "jni_handles") == 0) {
1104 verify_flags |= Verify_JNIHandles;
1105 } else if (strcmp(token, "codecache_oops") == 0) {
1106 verify_flags |= Verify_CodeCacheOops;
1107 } else if (strcmp(token, "resolved_method_table") == 0) {
1108 verify_flags |= Verify_ResolvedMethodTable;
1109 } else if (strcmp(token, "stringdedup") == 0) {
1110 verify_flags |= Verify_StringDedup;
1111 } else {
1112 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1113 }
1114 token = strtok_r(nullptr, delimiter, &save_ptr);
1115 }
1116 FREE_C_HEAP_ARRAY(char, subset_list);
1117 }
1118
1119 bool Universe::should_verify_subset(uint subset) {
1120 if (verify_flags & subset) {
1121 return true;
1122 }
1123 return false;
1124 }
1125
1126 void Universe::verify(VerifyOption option, const char* prefix) {
1127 COMPILER2_PRESENT(
1128 assert(!DerivedPointerTable::is_active(),
1129 "DPT should not be active during verification "
1130 "(of thread stacks below)");
1131 )
1132
1133 Thread* thread = Thread::current();
1134 ResourceMark rm(thread);
1135 HandleMark hm(thread); // Handles created during verification can be zapped
1136 _verify_count++;
1137
1138 FormatBuffer<> title("Verifying %s", prefix);
1139 GCTraceTime(Info, gc, verify) tm(title.buffer());
1140 if (should_verify_subset(Verify_Threads)) {
1141 log_debug(gc, verify)("Threads");
1142 Threads::verify();
1143 }
1144 if (should_verify_subset(Verify_Heap)) {
1145 log_debug(gc, verify)("Heap");
1146 heap()->verify(option);
1147 }
1148 if (should_verify_subset(Verify_SymbolTable)) {
1149 log_debug(gc, verify)("SymbolTable");
1150 SymbolTable::verify();
1151 }
1152 if (should_verify_subset(Verify_StringTable)) {
1153 log_debug(gc, verify)("StringTable");
1154 StringTable::verify();
1155 }
1156 if (should_verify_subset(Verify_CodeCache)) {
1157 log_debug(gc, verify)("CodeCache");
1158 CodeCache::verify();
1159 }
1160 if (should_verify_subset(Verify_SystemDictionary)) {
1161 log_debug(gc, verify)("SystemDictionary");
1162 SystemDictionary::verify();
1163 }
1164 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1165 log_debug(gc, verify)("ClassLoaderDataGraph");
1166 ClassLoaderDataGraph::verify();
1167 }
1168 if (should_verify_subset(Verify_MetaspaceUtils)) {
1169 log_debug(gc, verify)("MetaspaceUtils");
1170 DEBUG_ONLY(MetaspaceUtils::verify();)
1171 }
1172 if (should_verify_subset(Verify_JNIHandles)) {
1173 log_debug(gc, verify)("JNIHandles");
1174 JNIHandles::verify();
1175 }
1176 if (should_verify_subset(Verify_CodeCacheOops)) {
1177 log_debug(gc, verify)("CodeCache Oops");
1178 CodeCache::verify_oops();
1179 }
1180 if (should_verify_subset(Verify_ResolvedMethodTable)) {
1181 log_debug(gc, verify)("ResolvedMethodTable Oops");
1182 ResolvedMethodTable::verify();
1183 }
1184 if (should_verify_subset(Verify_StringDedup)) {
1185 log_debug(gc, verify)("String Deduplication");
1186 StringDedup::verify();
1187 }
1188 }
1189
1190
1191 #ifndef PRODUCT
1192 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1193 assert(low_boundary < high_boundary, "bad interval");
1194
1195 // decide which low-order bits we require to be clear:
1196 size_t alignSize = MinObjAlignmentInBytes;
1197 size_t min_object_size = CollectedHeap::min_fill_size();
1198
1199 // make an inclusive limit:
1200 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1201 uintptr_t min = (uintptr_t)low_boundary;
1202 assert(min < max, "bad interval");
1203 uintptr_t diff = max ^ min;
1204
1205 // throw away enough low-order bits to make the diff vanish
1206 uintptr_t mask = (uintptr_t)(-1);
1207 while ((mask & diff) != 0)
1208 mask <<= 1;
1209 uintptr_t bits = (min & mask);
1210 assert(bits == (max & mask), "correct mask");
1211 // check an intermediate value between min and max, just to make sure:
1212 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1213
1214 // require address alignment, too:
1215 mask |= (alignSize - 1);
1216
1217 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1218 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1219 }
1220 _verify_oop_mask = mask;
1221 _verify_oop_bits = bits;
1222 }
1223
1224 void Universe::set_verify_data(uintptr_t mask, uintptr_t bits) {
1225 _verify_oop_mask = mask;
1226 _verify_oop_bits = bits;
1227 }
1228
1229 // Oop verification (see MacroAssembler::verify_oop)
1230
1231 uintptr_t Universe::verify_oop_mask() {
1232 return _verify_oop_mask;
1233 }
1234
1235 uintptr_t Universe::verify_oop_bits() {
1236 return _verify_oop_bits;
1237 }
1238
1239 uintptr_t Universe::verify_mark_mask() {
1240 return markWord::lock_mask_in_place;
1241 }
1242
1243 uintptr_t Universe::verify_mark_bits() {
1244 intptr_t mask = verify_mark_mask();
1245 intptr_t bits = (intptr_t)markWord::prototype().value();
1246 assert((bits & ~mask) == 0, "no stray header bits");
1247 return bits;
1248 }
1249 #endif // PRODUCT
1250
1251
1252 void LatestMethodCache::init(Klass* k, Method* m) {
1253 if (!UseSharedSpaces) {
1254 _klass = k;
1255 }
1256 #ifndef PRODUCT
1257 else {
1258 // sharing initialization should have already set up _klass
1259 assert(_klass != nullptr, "just checking");
1260 }
1261 #endif
1262
1263 _method_idnum = m->method_idnum();
1264 assert(_method_idnum >= 0, "sanity check");
1265 }
1266
1267
1268 Method* LatestMethodCache::get_method() {
1269 if (klass() == nullptr) return nullptr;
1270 InstanceKlass* ik = InstanceKlass::cast(klass());
1271 Method* m = ik->method_with_idnum(method_idnum());
1272 assert(m != nullptr, "sanity check");
1273 return m;
1274 }
1275
1276 void LatestMethodCache::serialize(SerializeClosure* f) {
1277 f->do_ptr(&_klass);
1278 }
1279
1280 #ifdef ASSERT
1281 // Release dummy object(s) at bottom of heap
1282 bool Universe::release_fullgc_alot_dummy() {
1283 MutexLocker ml(FullGCALot_lock);
1284 objArrayOop fullgc_alot_dummy_array = (objArrayOop)_fullgc_alot_dummy_array.resolve();
1285 if (fullgc_alot_dummy_array != nullptr) {
1286 if (_fullgc_alot_dummy_next >= fullgc_alot_dummy_array->length()) {
1287 // No more dummies to release, release entire array instead
1288 _fullgc_alot_dummy_array.release(Universe::vm_global());
1289 _fullgc_alot_dummy_array = OopHandle(); // null out OopStorage pointer.
1290 return false;
1291 }
1292
1293 // Release dummy at bottom of old generation
1294 fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, nullptr);
1295 }
1296 return true;
1297 }
1298
1299 bool Universe::is_gc_active() {
1300 return heap()->is_gc_active();
1301 }
1302
1303 bool Universe::is_in_heap(const void* p) {
1304 return heap()->is_in(p);
1305 }
1306
1307 #endif // ASSERT