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