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