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/cpuTimeCounters.hpp"
72 #include "runtime/flags/jvmFlagLimit.hpp"
73 #include "runtime/handles.inline.hpp"
74 #include "runtime/init.hpp"
75 #include "runtime/java.hpp"
76 #include "runtime/javaThread.hpp"
77 #include "runtime/jniHandles.hpp"
78 #include "runtime/threads.hpp"
79 #include "runtime/timerTrace.hpp"
80 #include "sanitizers/leak.hpp"
81 #include "services/memoryService.hpp"
82 #include "utilities/align.hpp"
83 #include "utilities/autoRestore.hpp"
84 #include "utilities/debug.hpp"
85 #include "utilities/formatBuffer.hpp"
86 #include "utilities/macros.hpp"
87 #include "utilities/ostream.hpp"
88 #include "utilities/preserveException.hpp"
89
90 // Known objects
91 Klass* Universe::_typeArrayKlassObjs[T_LONG+1] = { nullptr /*, nullptr...*/ };
92 Klass* Universe::_objectArrayKlassObj = nullptr;
93 Klass* Universe::_fillerArrayKlassObj = nullptr;
94 OopHandle Universe::_basic_type_mirrors[T_VOID+1];
95 #if INCLUDE_CDS_JAVA_HEAP
96 int Universe::_archived_basic_type_mirror_indices[T_VOID+1];
97 #endif
98
99 OopHandle Universe::_main_thread_group;
100 OopHandle Universe::_system_thread_group;
101 OopHandle Universe::_the_empty_class_array;
102 OopHandle Universe::_the_null_string;
103 OopHandle Universe::_the_min_jint_string;
104
105 OopHandle Universe::_the_null_sentinel;
106
107 // _out_of_memory_errors is an objArray
108 enum OutOfMemoryInstance { _oom_java_heap,
109 _oom_c_heap,
110 _oom_metaspace,
111 _oom_class_metaspace,
112 _oom_array_size,
113 _oom_gc_overhead_limit,
114 _oom_realloc_objects,
115 _oom_retry,
116 _oom_count };
117
118 OopHandle Universe::_out_of_memory_errors;
119 OopHandle Universe:: _class_init_stack_overflow_error;
120 OopHandle Universe::_delayed_stack_overflow_error_message;
121 OopHandle Universe::_preallocated_out_of_memory_error_array;
122 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
123
124 // Message details for OOME objects, preallocate these objects since they could be
125 // used when throwing OOME, we should try to avoid further allocation in such case
126 OopHandle Universe::_msg_metaspace;
127 OopHandle Universe::_msg_class_metaspace;
128
129 OopHandle Universe::_null_ptr_exception_instance;
130 OopHandle Universe::_arithmetic_exception_instance;
131 OopHandle Universe::_virtual_machine_error_instance;
132
133 OopHandle Universe::_reference_pending_list;
134
135 Array<Klass*>* Universe::_the_array_interfaces_array = nullptr;
136 LatestMethodCache* Universe::_finalizer_register_cache = nullptr;
137 LatestMethodCache* Universe::_loader_addClass_cache = nullptr;
138 LatestMethodCache* Universe::_throw_illegal_access_error_cache = nullptr;
139 LatestMethodCache* Universe::_throw_no_such_method_error_cache = nullptr;
140 LatestMethodCache* Universe::_do_stack_walk_cache = nullptr;
141 LatestMethodCache* Universe::_is_substitutable_cache = nullptr;
142 LatestMethodCache* Universe::_value_object_hash_code_cache = nullptr;
143
144 long Universe::verify_flags = Universe::Verify_All;
145
146 Array<int>* Universe::_the_empty_int_array = nullptr;
147 Array<u2>* Universe::_the_empty_short_array = nullptr;
148 Array<Klass*>* Universe::_the_empty_klass_array = nullptr;
149 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = nullptr;
150 Array<Method*>* Universe::_the_empty_method_array = nullptr;
151
152 // These variables are guarded by FullGCALot_lock.
153 debug_only(OopHandle Universe::_fullgc_alot_dummy_array;)
154 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
155
156 // Heap
157 int Universe::_verify_count = 0;
158
159 // Oop verification (see MacroAssembler::verify_oop)
160 uintptr_t Universe::_verify_oop_mask = 0;
161 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
162
163 int Universe::_base_vtable_size = 0;
164 bool Universe::_bootstrapping = false;
165 bool Universe::_module_initialized = false;
166 bool Universe::_fully_initialized = false;
167
168 OopStorage* Universe::_vm_weak = nullptr;
169 OopStorage* Universe::_vm_global = nullptr;
170
171 CollectedHeap* Universe::_collectedHeap = nullptr;
172
173 objArrayOop Universe::the_empty_class_array () {
174 return (objArrayOop)_the_empty_class_array.resolve();
175 }
176
177 oop Universe::main_thread_group() { return _main_thread_group.resolve(); }
178 void Universe::set_main_thread_group(oop group) { _main_thread_group = OopHandle(vm_global(), group); }
179
180 oop Universe::system_thread_group() { return _system_thread_group.resolve(); }
181 void Universe::set_system_thread_group(oop group) { _system_thread_group = OopHandle(vm_global(), group); }
182
183 oop Universe::the_null_string() { return _the_null_string.resolve(); }
184 oop Universe::the_min_jint_string() { return _the_min_jint_string.resolve(); }
185
186 oop Universe::null_ptr_exception_instance() { return _null_ptr_exception_instance.resolve(); }
187 oop Universe::arithmetic_exception_instance() { return _arithmetic_exception_instance.resolve(); }
188 oop Universe::virtual_machine_error_instance() { return _virtual_machine_error_instance.resolve(); }
189
190 oop Universe::the_null_sentinel() { return _the_null_sentinel.resolve(); }
191
192 oop Universe::int_mirror() { return check_mirror(_basic_type_mirrors[T_INT].resolve()); }
193 oop Universe::float_mirror() { return check_mirror(_basic_type_mirrors[T_FLOAT].resolve()); }
194 oop Universe::double_mirror() { return check_mirror(_basic_type_mirrors[T_DOUBLE].resolve()); }
195 oop Universe::byte_mirror() { return check_mirror(_basic_type_mirrors[T_BYTE].resolve()); }
196 oop Universe::bool_mirror() { return check_mirror(_basic_type_mirrors[T_BOOLEAN].resolve()); }
197 oop Universe::char_mirror() { return check_mirror(_basic_type_mirrors[T_CHAR].resolve()); }
198 oop Universe::long_mirror() { return check_mirror(_basic_type_mirrors[T_LONG].resolve()); }
199 oop Universe::short_mirror() { return check_mirror(_basic_type_mirrors[T_SHORT].resolve()); }
200 oop Universe::void_mirror() { return check_mirror(_basic_type_mirrors[T_VOID].resolve()); }
201
202 oop Universe::java_mirror(BasicType t) {
203 assert((uint)t < T_VOID+1, "range check");
204 assert(!is_reference_type(t), "sanity");
205 return check_mirror(_basic_type_mirrors[t].resolve());
206 }
207
208 void Universe::basic_type_classes_do(KlassClosure *closure) {
209 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
210 closure->do_klass(_typeArrayKlassObjs[i]);
211 }
212 // We don't do the following because it will confuse JVMTI.
213 // _fillerArrayKlassObj is used only by GC, which doesn't need to see
214 // this klass from basic_type_classes_do().
215 //
216 // closure->do_klass(_fillerArrayKlassObj);
217 }
218
219 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
220 it->push(&_klass);
221 }
222
223 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
224 it->push(&_fillerArrayKlassObj);
225 for (int i = 0; i < T_LONG+1; i++) {
226 it->push(&_typeArrayKlassObjs[i]);
227 }
228 it->push(&_objectArrayKlassObj);
229
230 it->push(&_the_empty_int_array);
231 it->push(&_the_empty_short_array);
232 it->push(&_the_empty_klass_array);
233 it->push(&_the_empty_instance_klass_array);
234 it->push(&_the_empty_method_array);
235 it->push(&_the_array_interfaces_array);
236
237 _finalizer_register_cache->metaspace_pointers_do(it);
238 _loader_addClass_cache->metaspace_pointers_do(it);
239 _throw_illegal_access_error_cache->metaspace_pointers_do(it);
240 _throw_no_such_method_error_cache->metaspace_pointers_do(it);
241 _do_stack_walk_cache->metaspace_pointers_do(it);
242 _is_substitutable_cache->metaspace_pointers_do(it);
243 _value_object_hash_code_cache->metaspace_pointers_do(it);
244 }
245
246 #if INCLUDE_CDS_JAVA_HEAP
247 void Universe::set_archived_basic_type_mirror_index(BasicType t, int index) {
248 assert(CDSConfig::is_dumping_heap(), "sanity");
249 assert(!is_reference_type(t), "sanity");
250 _archived_basic_type_mirror_indices[t] = index;
251 }
252
253 void Universe::update_archived_basic_type_mirrors() {
254 if (ArchiveHeapLoader::is_in_use()) {
255 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
256 int index = _archived_basic_type_mirror_indices[i];
257 if (!is_reference_type((BasicType)i) && index >= 0) {
258 oop mirror_oop = HeapShared::get_root(index);
259 assert(mirror_oop != nullptr, "must be");
260 _basic_type_mirrors[i] = OopHandle(vm_global(), mirror_oop);
261 }
262 }
263 }
264 }
265 #endif
266
267 void Universe::serialize(SerializeClosure* f) {
268
269 #if INCLUDE_CDS_JAVA_HEAP
270 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
271 f->do_int(&_archived_basic_type_mirror_indices[i]);
272 // if f->reading(): We can't call HeapShared::get_root() yet, as the heap
273 // contents may need to be relocated. _basic_type_mirrors[i] will be
274 // updated later in Universe::update_archived_basic_type_mirrors().
275 }
276 #endif
277
278 f->do_ptr(&_fillerArrayKlassObj);
279 for (int i = 0; i < T_LONG+1; i++) {
280 f->do_ptr(&_typeArrayKlassObjs[i]);
281 }
282
283 f->do_ptr(&_objectArrayKlassObj);
284 f->do_ptr(&_the_array_interfaces_array);
285 f->do_ptr(&_the_empty_int_array);
286 f->do_ptr(&_the_empty_short_array);
287 f->do_ptr(&_the_empty_method_array);
288 f->do_ptr(&_the_empty_klass_array);
289 f->do_ptr(&_the_empty_instance_klass_array);
290 _finalizer_register_cache->serialize(f);
291 _loader_addClass_cache->serialize(f);
292 _throw_illegal_access_error_cache->serialize(f);
293 _throw_no_such_method_error_cache->serialize(f);
294 _do_stack_walk_cache->serialize(f);
295 _is_substitutable_cache->serialize(f);
296 _value_object_hash_code_cache->serialize(f);
297 }
298
299
300 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
301 if (size < alignment || size % alignment != 0) {
302 vm_exit_during_initialization(
303 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
304 }
305 }
306
307 void initialize_basic_type_klass(Klass* k, TRAPS) {
308 Klass* ok = vmClasses::Object_klass();
309 #if INCLUDE_CDS
310 if (UseSharedSpaces) {
311 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
312 assert(k->super() == ok, "u3");
313 if (k->is_instance_klass()) {
314 InstanceKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), nullptr, CHECK);
315 } else {
316 ArrayKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), CHECK);
317 }
318 } else
319 #endif
320 {
321 k->initialize_supers(ok, nullptr, CHECK);
322 }
323 k->append_to_sibling_list();
324 }
325
326 void Universe::genesis(TRAPS) {
327 ResourceMark rm(THREAD);
328 HandleMark hm(THREAD);
329
330 // Explicit null checks are needed if these offsets are not smaller than the page size
331 assert(oopDesc::klass_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()),
332 "Klass offset is expected to be less than the page size");
333 assert(arrayOopDesc::length_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()),
334 "Array length offset is expected to be less than the page size");
335
336 { AutoModifyRestore<bool> temporarily(_bootstrapping, true);
337
338 java_lang_Class::allocate_fixup_lists();
339
340 // determine base vtable size; without that we cannot create the array klasses
341 compute_base_vtable_size();
342
343 if (!UseSharedSpaces) {
344 // Initialization of the fillerArrayKlass must come before regular
345 // int-TypeArrayKlass so that the int-Array mirror points to the
346 // int-TypeArrayKlass.
347 _fillerArrayKlassObj = TypeArrayKlass::create_klass(T_INT, "Ljdk/internal/vm/FillerArray;", CHECK);
348 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
349 _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK);
350 }
351
352 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
353
354 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, nullptr, CHECK);
355 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
356 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
357 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
358 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
359 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK);
360 }
361
362 vmSymbols::initialize();
363
364 SystemDictionary::initialize(CHECK);
365
366 // Create string constants
367 oop s = StringTable::intern("null", CHECK);
368 _the_null_string = OopHandle(vm_global(), s);
369 s = StringTable::intern("-2147483648", CHECK);
370 _the_min_jint_string = OopHandle(vm_global(), s);
371
372
373 #if INCLUDE_CDS
374 if (UseSharedSpaces) {
375 // Verify shared interfaces array.
376 assert(_the_array_interfaces_array->at(0) ==
377 vmClasses::Cloneable_klass(), "u3");
378 assert(_the_array_interfaces_array->at(1) ==
379 vmClasses::Serializable_klass(), "u3");
380
381 } else
382 #endif
383 {
384 // Set up shared interfaces array. (Do this before supers are set up.)
385 _the_array_interfaces_array->at_put(0, vmClasses::Cloneable_klass());
386 _the_array_interfaces_array->at_put(1, vmClasses::Serializable_klass());
387 }
388
389 initialize_basic_type_klass(_fillerArrayKlassObj, CHECK);
390
391 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
392 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
393 initialize_basic_type_klass(floatArrayKlassObj(), CHECK);
394 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
395 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
396 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
397 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
398 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
399
400 assert(_fillerArrayKlassObj != intArrayKlassObj(),
401 "Internal filler array klass should be different to int array Klass");
402 } // end of core bootstrapping
403
404 {
405 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
406 _the_null_sentinel = OopHandle(vm_global(), tns());
407 }
408
409 // Create a handle for reference_pending_list
410 _reference_pending_list = OopHandle(vm_global(), nullptr);
411
412 // Maybe this could be lifted up now that object array can be initialized
413 // during the bootstrapping.
414
415 // OLD
416 // Initialize _objectArrayKlass after core bootstraping to make
417 // sure the super class is set up properly for _objectArrayKlass.
418 // ---
419 // NEW
420 // Since some of the old system object arrays have been converted to
421 // ordinary object arrays, _objectArrayKlass will be loaded when
422 // SystemDictionary::initialize(CHECK); is run. See the extra check
423 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
424 _objectArrayKlassObj = InstanceKlass::
425 cast(vmClasses::Object_klass())->array_klass(1, CHECK);
426 // OLD
427 // Add the class to the class hierarchy manually to make sure that
428 // its vtable is initialized after core bootstrapping is completed.
429 // ---
430 // New
431 // Have already been initialized.
432 _objectArrayKlassObj->append_to_sibling_list();
433
434 #ifdef ASSERT
435 if (FullGCALot) {
436 // Allocate an array of dummy objects.
437 // We'd like these to be at the bottom of the old generation,
438 // so that when we free one and then collect,
439 // (almost) the whole heap moves
440 // and we find out if we actually update all the oops correctly.
441 // But we can't allocate directly in the old generation,
442 // so we allocate wherever, and hope that the first collection
443 // moves these objects to the bottom of the old generation.
444 int size = FullGCALotDummies * 2;
445
446 objArrayOop naked_array = oopFactory::new_objArray(vmClasses::Object_klass(), size, CHECK);
447 objArrayHandle dummy_array(THREAD, naked_array);
448 int i = 0;
449 while (i < size) {
450 // Allocate dummy in old generation
451 oop dummy = vmClasses::Object_klass()->allocate_instance(CHECK);
452 dummy_array->obj_at_put(i++, dummy);
453 }
454 {
455 // Only modify the global variable inside the mutex.
456 // If we had a race to here, the other dummy_array instances
457 // and their elements just get dropped on the floor, which is fine.
458 MutexLocker ml(THREAD, FullGCALot_lock);
459 if (_fullgc_alot_dummy_array.is_empty()) {
460 _fullgc_alot_dummy_array = OopHandle(vm_global(), dummy_array());
461 }
462 }
463 assert(i == ((objArrayOop)_fullgc_alot_dummy_array.resolve())->length(), "just checking");
464 }
465 #endif
466 }
467
468 void Universe::initialize_basic_type_mirrors(TRAPS) {
469 #if INCLUDE_CDS_JAVA_HEAP
470 if (UseSharedSpaces &&
471 ArchiveHeapLoader::is_in_use() &&
472 _basic_type_mirrors[T_INT].resolve() != nullptr) {
473 assert(ArchiveHeapLoader::can_use(), "Sanity");
474
475 // check that all basic type mirrors are mapped also
476 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
477 if (!is_reference_type((BasicType)i)) {
478 oop m = _basic_type_mirrors[i].resolve();
479 assert(m != nullptr, "archived mirrors should not be null");
480 }
481 }
482 } else
483 // _basic_type_mirrors[T_INT], etc, are null if archived heap is not mapped.
484 #endif
485 {
486 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
487 BasicType bt = (BasicType)i;
488 if (!is_reference_type(bt)) {
489 oop m = java_lang_Class::create_basic_type_mirror(type2name(bt), bt, CHECK);
490 _basic_type_mirrors[i] = OopHandle(vm_global(), m);
491 }
492 CDS_JAVA_HEAP_ONLY(_archived_basic_type_mirror_indices[i] = -1);
493 }
494 }
495 if (CDSConfig::is_dumping_heap()) {
496 HeapShared::init_scratch_objects(CHECK);
497 }
498 }
499
500 void Universe::fixup_mirrors(TRAPS) {
501 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
502 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
503 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
504 // that the number of objects allocated at this point is very small.
505 assert(vmClasses::Class_klass_loaded(), "java.lang.Class should be loaded");
506 HandleMark hm(THREAD);
507
508 if (!UseSharedSpaces) {
509 // Cache the start of the static fields
510 InstanceMirrorKlass::init_offset_of_static_fields();
511 }
512
513 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
514 int list_length = list->length();
515 for (int i = 0; i < list_length; i++) {
516 Klass* k = list->at(i);
517 assert(k->is_klass(), "List should only hold classes");
518 java_lang_Class::fixup_mirror(k, CATCH);
519 }
520 delete java_lang_Class::fixup_mirror_list();
521 java_lang_Class::set_fixup_mirror_list(nullptr);
522 }
523
524 #define assert_pll_locked(test) \
525 assert(Heap_lock->test(), "Reference pending list access requires lock")
526
527 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
528
529 oop Universe::reference_pending_list() {
530 if (Thread::current()->is_VM_thread()) {
531 assert_pll_locked(is_locked);
532 } else {
533 assert_pll_ownership();
534 }
535 return _reference_pending_list.resolve();
536 }
537
538 void Universe::clear_reference_pending_list() {
539 assert_pll_ownership();
540 _reference_pending_list.replace(nullptr);
541 }
542
543 bool Universe::has_reference_pending_list() {
544 assert_pll_ownership();
545 return _reference_pending_list.peek() != nullptr;
546 }
547
548 oop Universe::swap_reference_pending_list(oop list) {
549 assert_pll_locked(is_locked);
550 return _reference_pending_list.xchg(list);
551 }
552
553 #undef assert_pll_locked
554 #undef assert_pll_ownership
555
556 static void reinitialize_vtables() {
557 // The vtables are initialized by starting at java.lang.Object and
558 // initializing through the subclass links, so that the super
559 // classes are always initialized first.
560 for (ClassHierarchyIterator iter(vmClasses::Object_klass()); !iter.done(); iter.next()) {
561 Klass* sub = iter.klass();
562 sub->vtable().initialize_vtable();
563 }
564 }
565
566 static void reinitialize_itables() {
567
568 class ReinitTableClosure : public KlassClosure {
569 public:
570 void do_klass(Klass* k) {
571 if (k->is_instance_klass()) {
572 InstanceKlass::cast(k)->itable().initialize_itable();
573 }
574 }
575 };
576
577 MutexLocker mcld(ClassLoaderDataGraph_lock);
578 ReinitTableClosure cl;
579 ClassLoaderDataGraph::classes_do(&cl);
580 }
581
582 bool Universe::on_page_boundary(void* addr) {
583 return is_aligned(addr, os::vm_page_size());
584 }
585
586 // the array of preallocated errors with backtraces
587 objArrayOop Universe::preallocated_out_of_memory_errors() {
588 return (objArrayOop)_preallocated_out_of_memory_error_array.resolve();
589 }
590
591 objArrayOop Universe::out_of_memory_errors() { return (objArrayOop)_out_of_memory_errors.resolve(); }
592
593 oop Universe::out_of_memory_error_java_heap() {
594 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_java_heap));
595 }
596
597 oop Universe::out_of_memory_error_c_heap() {
598 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_c_heap));
599 }
600
601 oop Universe::out_of_memory_error_metaspace() {
602 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_metaspace));
603 }
604
605 oop Universe::out_of_memory_error_class_metaspace() {
606 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_class_metaspace));
607 }
608
609 oop Universe::out_of_memory_error_array_size() {
610 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_array_size));
611 }
612
613 oop Universe::out_of_memory_error_gc_overhead_limit() {
614 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_gc_overhead_limit));
615 }
616
617 oop Universe::out_of_memory_error_realloc_objects() {
618 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_realloc_objects));
619 }
620
621 // Throw default _out_of_memory_error_retry object as it will never propagate out of the VM
622 oop Universe::out_of_memory_error_retry() { return out_of_memory_errors()->obj_at(_oom_retry); }
623
624 oop Universe::class_init_out_of_memory_error() { return out_of_memory_errors()->obj_at(_oom_java_heap); }
625 oop Universe::class_init_stack_overflow_error() { return _class_init_stack_overflow_error.resolve(); }
626 oop Universe::delayed_stack_overflow_error_message() { return _delayed_stack_overflow_error_message.resolve(); }
627
628
629 bool Universe::should_fill_in_stack_trace(Handle throwable) {
630 // never attempt to fill in the stack trace of preallocated errors that do not have
631 // backtrace. These errors are kept alive forever and may be "re-used" when all
632 // preallocated errors with backtrace have been consumed. Also need to avoid
633 // a potential loop which could happen if an out of memory occurs when attempting
634 // to allocate the backtrace.
635 objArrayOop preallocated_oom = out_of_memory_errors();
636 for (int i = 0; i < _oom_count; i++) {
637 if (throwable() == preallocated_oom->obj_at(i)) {
638 return false;
639 }
640 }
641 return true;
642 }
643
644
645 oop Universe::gen_out_of_memory_error(oop default_err) {
646 // generate an out of memory error:
647 // - if there is a preallocated error and stack traces are available
648 // (j.l.Throwable is initialized), then return the preallocated
649 // error with a filled in stack trace, and with the message
650 // provided by the default error.
651 // - otherwise, return the default error, without a stack trace.
652 int next;
653 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
654 vmClasses::Throwable_klass()->is_initialized()) {
655 next = (int)Atomic::add(&_preallocated_out_of_memory_error_avail_count, -1);
656 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
657 } else {
658 next = -1;
659 }
660 if (next < 0) {
661 // all preallocated errors have been used.
662 // return default
663 return default_err;
664 } else {
665 JavaThread* current = JavaThread::current();
666 Handle default_err_h(current, default_err);
667 // get the error object at the slot and set set it to null so that the
668 // array isn't keeping it alive anymore.
669 Handle exc(current, preallocated_out_of_memory_errors()->obj_at(next));
670 assert(exc() != nullptr, "slot has been used already");
671 preallocated_out_of_memory_errors()->obj_at_put(next, nullptr);
672
673 // use the message from the default error
674 oop msg = java_lang_Throwable::message(default_err_h());
675 assert(msg != nullptr, "no message");
676 java_lang_Throwable::set_message(exc(), msg);
677
678 // populate the stack trace and return it.
679 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
680 return exc();
681 }
682 }
683
684 bool Universe::is_out_of_memory_error_metaspace(oop ex_obj) {
685 return java_lang_Throwable::message(ex_obj) == _msg_metaspace.resolve();
686 }
687
688 bool Universe::is_out_of_memory_error_class_metaspace(oop ex_obj) {
689 return java_lang_Throwable::message(ex_obj) == _msg_class_metaspace.resolve();
690 }
691
692 // Setup preallocated OutOfMemoryError errors
693 void Universe::create_preallocated_out_of_memory_errors(TRAPS) {
694 InstanceKlass* ik = vmClasses::OutOfMemoryError_klass();
695 objArrayOop oa = oopFactory::new_objArray(ik, _oom_count, CHECK);
696 objArrayHandle oom_array(THREAD, oa);
697
698 for (int i = 0; i < _oom_count; i++) {
699 oop oom_obj = ik->allocate_instance(CHECK);
700 oom_array->obj_at_put(i, oom_obj);
701 }
702 _out_of_memory_errors = OopHandle(vm_global(), oom_array());
703
704 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK);
705 java_lang_Throwable::set_message(oom_array->obj_at(_oom_java_heap), msg());
706
707 msg = java_lang_String::create_from_str("C heap space", CHECK);
708 java_lang_Throwable::set_message(oom_array->obj_at(_oom_c_heap), msg());
709
710 msg = java_lang_String::create_from_str("Metaspace", CHECK);
711 _msg_metaspace = OopHandle(vm_global(), msg());
712 java_lang_Throwable::set_message(oom_array->obj_at(_oom_metaspace), msg());
713
714 msg = java_lang_String::create_from_str("Compressed class space", CHECK);
715 _msg_class_metaspace = OopHandle(vm_global(), msg());
716 java_lang_Throwable::set_message(oom_array->obj_at(_oom_class_metaspace), msg());
717
718 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK);
719 java_lang_Throwable::set_message(oom_array->obj_at(_oom_array_size), msg());
720
721 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK);
722 java_lang_Throwable::set_message(oom_array->obj_at(_oom_gc_overhead_limit), msg());
723
724 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK);
725 java_lang_Throwable::set_message(oom_array->obj_at(_oom_realloc_objects), msg());
726
727 msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK);
728 java_lang_Throwable::set_message(oom_array->obj_at(_oom_retry), msg());
729
730 // Setup the array of errors that have preallocated backtrace
731 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
732 objArrayOop instance = oopFactory::new_objArray(ik, len, CHECK);
733 _preallocated_out_of_memory_error_array = OopHandle(vm_global(), instance);
734 objArrayHandle preallocated_oom_array(THREAD, instance);
735
736 for (int i=0; i<len; i++) {
737 oop err = ik->allocate_instance(CHECK);
738 Handle err_h(THREAD, err);
739 java_lang_Throwable::allocate_backtrace(err_h, CHECK);
740 preallocated_oom_array->obj_at_put(i, err_h());
741 }
742 _preallocated_out_of_memory_error_avail_count = (jint)len;
743 }
744
745 intptr_t Universe::_non_oop_bits = 0;
746
747 void* Universe::non_oop_word() {
748 // Neither the high bits nor the low bits of this value is allowed
749 // to look like (respectively) the high or low bits of a real oop.
750 //
751 // High and low are CPU-specific notions, but low always includes
752 // the low-order bit. Since oops are always aligned at least mod 4,
753 // setting the low-order bit will ensure that the low half of the
754 // word will never look like that of a real oop.
755 //
756 // Using the OS-supplied non-memory-address word (usually 0 or -1)
757 // will take care of the high bits, however many there are.
758
759 if (_non_oop_bits == 0) {
760 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
761 }
762
763 return (void*)_non_oop_bits;
764 }
765
766 bool Universe::contains_non_oop_word(void* p) {
767 return *(void**)p == non_oop_word();
768 }
769
770 static void initialize_global_behaviours() {
771 DefaultICProtectionBehaviour* protection_behavior = new DefaultICProtectionBehaviour();
772 // Ignore leak of DefaultICProtectionBehaviour. It is overriden by some GC implementations and the
773 // pointer is leaked once.
774 LSAN_IGNORE_OBJECT(protection_behavior);
775 CompiledICProtectionBehaviour::set_current(protection_behavior);
776 }
777
778 jint universe_init() {
779 assert(!Universe::_fully_initialized, "called after initialize_vtables");
780 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
781 "LogHeapWordSize is incorrect.");
782 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
783 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
784 "oop size is not not a multiple of HeapWord size");
785
786 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
787
788 initialize_global_behaviours();
789
790 GCLogPrecious::initialize();
791
792 // Initialize CPUTimeCounters object, which must be done before creation of the heap.
793 CPUTimeCounters::initialize();
794
795 #ifdef _LP64
796 MetaspaceShared::adjust_heap_sizes_for_dumping();
797 #endif // _LP64
798
799 GCConfig::arguments()->initialize_heap_sizes();
800
801 jint status = Universe::initialize_heap();
802 if (status != JNI_OK) {
803 return status;
804 }
805
806 Universe::initialize_tlab();
807
808 Metaspace::global_initialize();
809 // Initialize performance counters for metaspaces
810 MetaspaceCounters::initialize_performance_counters();
811
812 // Checks 'AfterMemoryInit' constraints.
813 if (!JVMFlagLimit::check_all_constraints(JVMFlagConstraintPhase::AfterMemoryInit)) {
814 return JNI_EINVAL;
815 }
816
817 ClassLoaderData::init_null_class_loader_data();
818
819 // We have a heap so create the Method* caches before
820 // Metaspace::initialize_shared_spaces() tries to populate them.
821 Universe::_finalizer_register_cache = new LatestMethodCache();
822 Universe::_loader_addClass_cache = new LatestMethodCache();
823 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
824 Universe::_throw_no_such_method_error_cache = new LatestMethodCache();
825 Universe::_do_stack_walk_cache = new LatestMethodCache();
826 Universe::_is_substitutable_cache = new LatestMethodCache();
827 Universe::_value_object_hash_code_cache = new LatestMethodCache();
828
829 #if INCLUDE_CDS
830 DynamicArchive::check_for_dynamic_dump();
831 if (UseSharedSpaces) {
832 // Read the data structures supporting the shared spaces (shared
833 // system dictionary, symbol table, etc.)
834 MetaspaceShared::initialize_shared_spaces();
835 }
836 if (CDSConfig::is_dumping_archive()) {
837 MetaspaceShared::prepare_for_dumping();
838 }
839 #endif
840
841 SymbolTable::create_table();
842 StringTable::create_table();
843
844 if (strlen(VerifySubSet) > 0) {
845 Universe::initialize_verify_flags();
846 }
847
848 ResolvedMethodTable::create_table();
849
850 return JNI_OK;
851 }
852
853 jint Universe::initialize_heap() {
854 assert(_collectedHeap == nullptr, "Heap already created");
855 _collectedHeap = GCConfig::arguments()->create_heap();
856
857 log_info(gc)("Using %s", _collectedHeap->name());
858 return _collectedHeap->initialize();
859 }
860
861 void Universe::initialize_tlab() {
862 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
863 PLAB::startup_initialization();
864 if (UseTLAB) {
865 ThreadLocalAllocBuffer::startup_initialization();
866 }
867 }
868
869 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
870
871 assert(alignment <= Arguments::conservative_max_heap_alignment(),
872 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
873 alignment, Arguments::conservative_max_heap_alignment());
874
875 size_t total_reserved = align_up(heap_size, alignment);
876 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
877 "heap size is too big for compressed oops");
878
879 size_t page_size = os::vm_page_size();
880 if (UseLargePages && is_aligned(alignment, os::large_page_size())) {
881 page_size = os::large_page_size();
882 } else {
883 // Parallel is the only collector that might opt out of using large pages
884 // for the heap.
885 assert(!UseLargePages || UseParallelGC , "Wrong alignment to use large pages");
886 }
887
888 // Now create the space.
889 ReservedHeapSpace total_rs(total_reserved, alignment, page_size, AllocateHeapAt);
890
891 if (total_rs.is_reserved()) {
892 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
893 "must be exactly of required size and alignment");
894 // We are good.
895
896 if (AllocateHeapAt != nullptr) {
897 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
898 }
899
900 if (UseCompressedOops) {
901 CompressedOops::initialize(total_rs);
902 }
903
904 Universe::calculate_verify_data((HeapWord*)total_rs.base(), (HeapWord*)total_rs.end());
905
906 return total_rs;
907 }
908
909 vm_exit_during_initialization(
910 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
911 total_reserved/K));
912
913 // satisfy compiler
914 ShouldNotReachHere();
915 return ReservedHeapSpace(0, 0, os::vm_page_size());
916 }
917
918 OopStorage* Universe::vm_weak() {
919 return Universe::_vm_weak;
920 }
921
922 OopStorage* Universe::vm_global() {
923 return Universe::_vm_global;
924 }
925
926 void Universe::oopstorage_init() {
927 Universe::_vm_global = OopStorageSet::create_strong("VM Global", mtInternal);
928 Universe::_vm_weak = OopStorageSet::create_weak("VM Weak", mtInternal);
929 }
930
931 void universe_oopstorage_init() {
932 Universe::oopstorage_init();
933 }
934
935 void initialize_known_method(LatestMethodCache* method_cache,
936 InstanceKlass* ik,
937 const char* method,
938 Symbol* signature,
939 bool is_static, TRAPS)
940 {
941 TempNewSymbol name = SymbolTable::new_symbol(method);
942 Method* m = nullptr;
943 // The klass must be linked before looking up the method.
944 if (!ik->link_class_or_fail(THREAD) ||
945 ((m = ik->find_method(name, signature)) == nullptr) ||
946 is_static != m->is_static()) {
947 ResourceMark rm(THREAD);
948 // NoSuchMethodException doesn't actually work because it tries to run the
949 // <init> function before java_lang_Class is linked. Print error and exit.
950 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
951 ik->name()->as_C_string(), method));
952 }
953 method_cache->init(ik, m);
954 }
955
956 void Universe::initialize_known_methods(TRAPS) {
957 // Set up static method for registering finalizers
958 initialize_known_method(_finalizer_register_cache,
959 vmClasses::Finalizer_klass(),
960 "register",
961 vmSymbols::object_void_signature(), true, CHECK);
962
963 initialize_known_method(_throw_illegal_access_error_cache,
964 vmClasses::internal_Unsafe_klass(),
965 "throwIllegalAccessError",
966 vmSymbols::void_method_signature(), true, CHECK);
967
968 initialize_known_method(_throw_no_such_method_error_cache,
969 vmClasses::internal_Unsafe_klass(),
970 "throwNoSuchMethodError",
971 vmSymbols::void_method_signature(), true, CHECK);
972
973 // Set up method for registering loaded classes in class loader vector
974 initialize_known_method(_loader_addClass_cache,
975 vmClasses::ClassLoader_klass(),
976 "addClass",
977 vmSymbols::class_void_signature(), false, CHECK);
978
979 // Set up method for stack walking
980 initialize_known_method(_do_stack_walk_cache,
981 vmClasses::AbstractStackWalker_klass(),
982 "doStackWalk",
983 vmSymbols::doStackWalk_signature(), false, CHECK);
984
985 // Set up substitutability testing
986 ResourceMark rm;
987 initialize_known_method(_is_substitutable_cache,
988 vmClasses::ValueObjectMethods_klass(),
989 vmSymbols::isSubstitutable_name()->as_C_string(),
990 vmSymbols::object_object_boolean_signature(), true, CHECK);
991 initialize_known_method(_value_object_hash_code_cache,
992 vmClasses::ValueObjectMethods_klass(),
993 vmSymbols::valueObjectHashCode_name()->as_C_string(),
994 vmSymbols::object_int_signature(), true, CHECK);
995 }
996
997 void universe2_init() {
998 EXCEPTION_MARK;
999 Universe::genesis(CATCH);
1000 }
1001
1002 // Set after initialization of the module runtime, call_initModuleRuntime
1003 void universe_post_module_init() {
1004 Universe::_module_initialized = true;
1005 }
1006
1007 bool universe_post_init() {
1008 assert(!is_init_completed(), "Error: initialization not yet completed!");
1009 Universe::_fully_initialized = true;
1010 EXCEPTION_MARK;
1011 if (!UseSharedSpaces) {
1012 reinitialize_vtables();
1013 reinitialize_itables();
1014 }
1015
1016 HandleMark hm(THREAD);
1017 // Setup preallocated empty java.lang.Class array for Method reflection.
1018
1019 objArrayOop the_empty_class_array = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_false);
1020 Universe::_the_empty_class_array = OopHandle(Universe::vm_global(), the_empty_class_array);
1021
1022 // Setup preallocated OutOfMemoryError errors
1023 Universe::create_preallocated_out_of_memory_errors(CHECK_false);
1024
1025 oop instance;
1026 // Setup preallocated cause message for delayed StackOverflowError
1027 if (StackReservedPages > 0) {
1028 instance = java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
1029 Universe::_delayed_stack_overflow_error_message = OopHandle(Universe::vm_global(), instance);
1030 }
1031
1032 // Setup preallocated NullPointerException
1033 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1034 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
1035 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1036 Universe::_null_ptr_exception_instance = OopHandle(Universe::vm_global(), instance);
1037
1038 // Setup preallocated ArithmeticException
1039 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1040 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
1041 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1042 Universe::_arithmetic_exception_instance = OopHandle(Universe::vm_global(), instance);
1043
1044 // Virtual Machine Error for when we get into a situation we can't resolve
1045 k = vmClasses::VirtualMachineError_klass();
1046 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1047 if (!linked) {
1048 tty->print_cr("Unable to link/verify VirtualMachineError class");
1049 return false; // initialization failed
1050 }
1051 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1052 Universe::_virtual_machine_error_instance = OopHandle(Universe::vm_global(), instance);
1053
1054 Handle msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1055 java_lang_Throwable::set_message(Universe::arithmetic_exception_instance(), msg());
1056
1057 // Setup preallocated StackOverflowError for use with class initialization failure
1058 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_StackOverflowError(), true, CHECK_false);
1059 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1060 Universe::_class_init_stack_overflow_error = OopHandle(Universe::vm_global(), instance);
1061
1062 Universe::initialize_known_methods(CHECK_false);
1063
1064 // This needs to be done before the first scavenge/gc, since
1065 // it's an input to soft ref clearing policy.
1066 {
1067 MutexLocker x(THREAD, Heap_lock);
1068 Universe::heap()->update_capacity_and_used_at_gc();
1069 }
1070
1071 // ("weak") refs processing infrastructure initialization
1072 Universe::heap()->post_initialize();
1073
1074 MemoryService::add_metaspace_memory_pools();
1075
1076 MemoryService::set_universe_heap(Universe::heap());
1077 #if INCLUDE_CDS
1078 MetaspaceShared::post_initialize(CHECK_false);
1079 #endif
1080 return true;
1081 }
1082
1083
1084 void Universe::compute_base_vtable_size() {
1085 _base_vtable_size = ClassLoader::compute_Object_vtable();
1086 }
1087
1088 void Universe::print_on(outputStream* st) {
1089 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1090 st->print_cr("Heap");
1091 heap()->print_on(st);
1092 }
1093
1094 void Universe::print_heap_at_SIGBREAK() {
1095 if (PrintHeapAtSIGBREAK) {
1096 print_on(tty);
1097 tty->cr();
1098 tty->flush();
1099 }
1100 }
1101
1102 void Universe::initialize_verify_flags() {
1103 verify_flags = 0;
1104 const char delimiter[] = " ,";
1105
1106 size_t length = strlen(VerifySubSet);
1107 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1108 strncpy(subset_list, VerifySubSet, length + 1);
1109 char* save_ptr;
1110
1111 char* token = strtok_r(subset_list, delimiter, &save_ptr);
1112 while (token != nullptr) {
1113 if (strcmp(token, "threads") == 0) {
1114 verify_flags |= Verify_Threads;
1115 } else if (strcmp(token, "heap") == 0) {
1116 verify_flags |= Verify_Heap;
1117 } else if (strcmp(token, "symbol_table") == 0) {
1118 verify_flags |= Verify_SymbolTable;
1119 } else if (strcmp(token, "string_table") == 0) {
1120 verify_flags |= Verify_StringTable;
1121 } else if (strcmp(token, "codecache") == 0) {
1122 verify_flags |= Verify_CodeCache;
1123 } else if (strcmp(token, "dictionary") == 0) {
1124 verify_flags |= Verify_SystemDictionary;
1125 } else if (strcmp(token, "classloader_data_graph") == 0) {
1126 verify_flags |= Verify_ClassLoaderDataGraph;
1127 } else if (strcmp(token, "metaspace") == 0) {
1128 verify_flags |= Verify_MetaspaceUtils;
1129 } else if (strcmp(token, "jni_handles") == 0) {
1130 verify_flags |= Verify_JNIHandles;
1131 } else if (strcmp(token, "codecache_oops") == 0) {
1132 verify_flags |= Verify_CodeCacheOops;
1133 } else if (strcmp(token, "resolved_method_table") == 0) {
1134 verify_flags |= Verify_ResolvedMethodTable;
1135 } else if (strcmp(token, "stringdedup") == 0) {
1136 verify_flags |= Verify_StringDedup;
1137 } else {
1138 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1139 }
1140 token = strtok_r(nullptr, delimiter, &save_ptr);
1141 }
1142 FREE_C_HEAP_ARRAY(char, subset_list);
1143 }
1144
1145 bool Universe::should_verify_subset(uint subset) {
1146 if (verify_flags & subset) {
1147 return true;
1148 }
1149 return false;
1150 }
1151
1152 void Universe::verify(VerifyOption option, const char* prefix) {
1153 COMPILER2_PRESENT(
1154 assert(!DerivedPointerTable::is_active(),
1155 "DPT should not be active during verification "
1156 "(of thread stacks below)");
1157 )
1158
1159 Thread* thread = Thread::current();
1160 ResourceMark rm(thread);
1161 HandleMark hm(thread); // Handles created during verification can be zapped
1162 _verify_count++;
1163
1164 FormatBuffer<> title("Verifying %s", prefix);
1165 GCTraceTime(Info, gc, verify) tm(title.buffer());
1166 if (should_verify_subset(Verify_Threads)) {
1167 log_debug(gc, verify)("Threads");
1168 Threads::verify();
1169 }
1170 if (should_verify_subset(Verify_Heap)) {
1171 log_debug(gc, verify)("Heap");
1172 heap()->verify(option);
1173 }
1174 if (should_verify_subset(Verify_SymbolTable)) {
1175 log_debug(gc, verify)("SymbolTable");
1176 SymbolTable::verify();
1177 }
1178 if (should_verify_subset(Verify_StringTable)) {
1179 log_debug(gc, verify)("StringTable");
1180 StringTable::verify();
1181 }
1182 if (should_verify_subset(Verify_CodeCache)) {
1183 log_debug(gc, verify)("CodeCache");
1184 CodeCache::verify();
1185 }
1186 if (should_verify_subset(Verify_SystemDictionary)) {
1187 log_debug(gc, verify)("SystemDictionary");
1188 SystemDictionary::verify();
1189 }
1190 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1191 log_debug(gc, verify)("ClassLoaderDataGraph");
1192 ClassLoaderDataGraph::verify();
1193 }
1194 if (should_verify_subset(Verify_MetaspaceUtils)) {
1195 log_debug(gc, verify)("MetaspaceUtils");
1196 DEBUG_ONLY(MetaspaceUtils::verify();)
1197 }
1198 if (should_verify_subset(Verify_JNIHandles)) {
1199 log_debug(gc, verify)("JNIHandles");
1200 JNIHandles::verify();
1201 }
1202 if (should_verify_subset(Verify_CodeCacheOops)) {
1203 log_debug(gc, verify)("CodeCache Oops");
1204 CodeCache::verify_oops();
1205 }
1206 if (should_verify_subset(Verify_ResolvedMethodTable)) {
1207 log_debug(gc, verify)("ResolvedMethodTable Oops");
1208 ResolvedMethodTable::verify();
1209 }
1210 if (should_verify_subset(Verify_StringDedup)) {
1211 log_debug(gc, verify)("String Deduplication");
1212 StringDedup::verify();
1213 }
1214 }
1215
1216
1217 #ifndef PRODUCT
1218 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1219 assert(low_boundary < high_boundary, "bad interval");
1220
1221 // decide which low-order bits we require to be clear:
1222 size_t alignSize = MinObjAlignmentInBytes;
1223 size_t min_object_size = CollectedHeap::min_fill_size();
1224
1225 // make an inclusive limit:
1226 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1227 uintptr_t min = (uintptr_t)low_boundary;
1228 assert(min < max, "bad interval");
1229 uintptr_t diff = max ^ min;
1230
1231 // throw away enough low-order bits to make the diff vanish
1232 uintptr_t mask = (uintptr_t)(-1);
1233 while ((mask & diff) != 0)
1234 mask <<= 1;
1235 uintptr_t bits = (min & mask);
1236 assert(bits == (max & mask), "correct mask");
1237 // check an intermediate value between min and max, just to make sure:
1238 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1239
1240 // require address alignment, too:
1241 mask |= (alignSize - 1);
1242
1243 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1244 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1245 }
1246 _verify_oop_mask = mask;
1247 _verify_oop_bits = bits;
1248 }
1249
1250 void Universe::set_verify_data(uintptr_t mask, uintptr_t bits) {
1251 _verify_oop_mask = mask;
1252 _verify_oop_bits = bits;
1253 }
1254
1255 // Oop verification (see MacroAssembler::verify_oop)
1256
1257 uintptr_t Universe::verify_oop_mask() {
1258 return _verify_oop_mask;
1259 }
1260
1261 uintptr_t Universe::verify_oop_bits() {
1262 return _verify_oop_bits;
1263 }
1264
1265 uintptr_t Universe::verify_mark_mask() {
1266 return markWord::lock_mask_in_place;
1267 }
1268
1269 uintptr_t Universe::verify_mark_bits() {
1270 intptr_t mask = verify_mark_mask();
1271 intptr_t bits = (intptr_t)markWord::prototype().value();
1272 assert((bits & ~mask) == 0, "no stray header bits");
1273 return bits;
1274 }
1275 #endif // PRODUCT
1276
1277
1278 void LatestMethodCache::init(Klass* k, Method* m) {
1279 if (!UseSharedSpaces) {
1280 _klass = k;
1281 }
1282 #ifndef PRODUCT
1283 else {
1284 // sharing initialization should have already set up _klass
1285 assert(_klass != nullptr, "just checking");
1286 }
1287 #endif
1288
1289 _method_idnum = m->method_idnum();
1290 assert(_method_idnum >= 0, "sanity check");
1291 }
1292
1293
1294 Method* LatestMethodCache::get_method() {
1295 if (klass() == nullptr) return nullptr;
1296 InstanceKlass* ik = InstanceKlass::cast(klass());
1297 Method* m = ik->method_with_idnum(method_idnum());
1298 assert(m != nullptr, "sanity check");
1299 return m;
1300 }
1301
1302 void LatestMethodCache::serialize(SerializeClosure* f) {
1303 f->do_ptr(&_klass);
1304 }
1305
1306 #ifdef ASSERT
1307 // Release dummy object(s) at bottom of heap
1308 bool Universe::release_fullgc_alot_dummy() {
1309 MutexLocker ml(FullGCALot_lock);
1310 objArrayOop fullgc_alot_dummy_array = (objArrayOop)_fullgc_alot_dummy_array.resolve();
1311 if (fullgc_alot_dummy_array != nullptr) {
1312 if (_fullgc_alot_dummy_next >= fullgc_alot_dummy_array->length()) {
1313 // No more dummies to release, release entire array instead
1314 _fullgc_alot_dummy_array.release(Universe::vm_global());
1315 _fullgc_alot_dummy_array = OopHandle(); // null out OopStorage pointer.
1316 return false;
1317 }
1318
1319 // Release dummy at bottom of old generation
1320 fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, nullptr);
1321 }
1322 return true;
1323 }
1324
1325 bool Universe::is_gc_active() {
1326 return heap()->is_gc_active();
1327 }
1328
1329 bool Universe::is_in_heap(const void* p) {
1330 return heap()->is_in(p);
1331 }
1332
1333 #endif // ASSERT