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