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