1 /*
2 * Copyright (c) 1997, 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "cds/archiveHeapLoader.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/dynamicArchive.hpp"
29 #include "cds/heapShared.hpp"
30 #include "cds/metaspaceShared.hpp"
31 #include "classfile/classLoader.hpp"
32 #include "classfile/classLoaderDataGraph.hpp"
33 #include "classfile/javaClasses.hpp"
34 #include "classfile/stringTable.hpp"
35 #include "classfile/symbolTable.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/vmClasses.hpp"
38 #include "classfile/vmSymbols.hpp"
39 #include "code/codeBehaviours.hpp"
40 #include "code/codeCache.hpp"
41 #include "compiler/oopMap.hpp"
42 #include "gc/shared/collectedHeap.inline.hpp"
43 #include "gc/shared/gcArguments.hpp"
44 #include "gc/shared/gcConfig.hpp"
45 #include "gc/shared/gcLogPrecious.hpp"
46 #include "gc/shared/gcTraceTime.inline.hpp"
47 #include "gc/shared/oopStorageSet.hpp"
48 #include "gc/shared/plab.hpp"
49 #include "gc/shared/stringdedup/stringDedup.hpp"
50 #include "gc/shared/tlab_globals.hpp"
51 #include "logging/log.hpp"
52 #include "logging/logStream.hpp"
53 #include "memory/metadataFactory.hpp"
54 #include "memory/metaspaceClosure.hpp"
55 #include "memory/metaspaceCounters.hpp"
56 #include "memory/metaspaceUtils.hpp"
57 #include "memory/oopFactory.hpp"
58 #include "memory/resourceArea.hpp"
59 #include "memory/universe.hpp"
60 #include "oops/compressedOops.hpp"
61 #include "oops/instanceKlass.hpp"
62 #include "oops/instanceMirrorKlass.hpp"
63 #include "oops/klass.inline.hpp"
64 #include "oops/objArrayOop.inline.hpp"
65 #include "oops/oop.inline.hpp"
66 #include "oops/oopHandle.inline.hpp"
67 #include "oops/typeArrayKlass.hpp"
68 #include "prims/resolvedMethodTable.hpp"
69 #include "runtime/arguments.hpp"
70 #include "runtime/atomic.hpp"
71 #include "runtime/cpuTimeCounters.hpp"
72 #include "runtime/flags/jvmFlagLimit.hpp"
73 #include "runtime/handles.inline.hpp"
74 #include "runtime/init.hpp"
75 #include "runtime/java.hpp"
76 #include "runtime/javaThread.hpp"
77 #include "runtime/jniHandles.hpp"
78 #include "runtime/threads.hpp"
79 #include "runtime/timerTrace.hpp"
80 #include "sanitizers/leak.hpp"
81 #include "services/memoryService.hpp"
82 #include "utilities/align.hpp"
83 #include "utilities/autoRestore.hpp"
84 #include "utilities/debug.hpp"
85 #include "utilities/formatBuffer.hpp"
86 #include "utilities/macros.hpp"
87 #include "utilities/ostream.hpp"
88 #include "utilities/preserveException.hpp"
89
90 // A helper class for caching a Method* when the user of the cache
91 // only cares about the latest version of the Method*. This cache safely
92 // interacts with the RedefineClasses API.
93 class LatestMethodCache {
94 // We save the InstanceKlass* and the idnum of Method* in order to get
95 // the current Method*.
96 InstanceKlass* _klass;
97 int _method_idnum;
98
99 public:
100 LatestMethodCache() { _klass = nullptr; _method_idnum = -1; }
101
102 void init(JavaThread* current, InstanceKlass* ik, const char* method,
103 Symbol* signature, bool is_static);
104 Method* get_method();
105 };
106
107 static LatestMethodCache _finalizer_register_cache; // Finalizer.register()
108 static LatestMethodCache _loader_addClass_cache; // ClassLoader.addClass()
109 static LatestMethodCache _throw_illegal_access_error_cache; // Unsafe.throwIllegalAccessError()
110 static LatestMethodCache _throw_no_such_method_error_cache; // Unsafe.throwNoSuchMethodError()
111 static LatestMethodCache _do_stack_walk_cache; // AbstractStackWalker.doStackWalk()
112
113 // Known objects
114 TypeArrayKlass* Universe::_typeArrayKlasses[T_LONG+1] = { nullptr /*, nullptr...*/ };
115 ObjArrayKlass* Universe::_objectArrayKlass = nullptr;
116 Klass* Universe::_fillerArrayKlass = nullptr;
117 OopHandle Universe::_basic_type_mirrors[T_VOID+1];
118 #if INCLUDE_CDS_JAVA_HEAP
119 int Universe::_archived_basic_type_mirror_indices[T_VOID+1];
120 #endif
121
122 OopHandle Universe::_main_thread_group;
123 OopHandle Universe::_system_thread_group;
124 OopHandle Universe::_the_empty_class_array;
125 OopHandle Universe::_the_null_string;
126 OopHandle Universe::_the_min_jint_string;
127
128 OopHandle Universe::_the_null_sentinel;
129
130 // _out_of_memory_errors is an objArray
131 enum OutOfMemoryInstance { _oom_java_heap,
132 _oom_c_heap,
133 _oom_metaspace,
134 _oom_class_metaspace,
135 _oom_array_size,
136 _oom_gc_overhead_limit,
137 _oom_realloc_objects,
138 _oom_count };
139
140 OopHandle Universe::_out_of_memory_errors;
141 OopHandle Universe:: _class_init_stack_overflow_error;
142 OopHandle Universe::_delayed_stack_overflow_error_message;
143 OopHandle Universe::_preallocated_out_of_memory_error_array;
144 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
145
146 // Message details for OOME objects, preallocate these objects since they could be
147 // used when throwing OOME, we should try to avoid further allocation in such case
148 OopHandle Universe::_msg_metaspace;
149 OopHandle Universe::_msg_class_metaspace;
150
151 OopHandle Universe::_reference_pending_list;
152
153 Array<Klass*>* Universe::_the_array_interfaces_array = nullptr;
154
155 long Universe::verify_flags = Universe::Verify_All;
156
157 Array<int>* Universe::_the_empty_int_array = nullptr;
158 Array<u2>* Universe::_the_empty_short_array = nullptr;
159 Array<Klass*>* Universe::_the_empty_klass_array = nullptr;
160 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = nullptr;
161 Array<Method*>* Universe::_the_empty_method_array = nullptr;
162
163 uintx Universe::_the_array_interfaces_bitmap = 0;
164 uintx Universe::_the_empty_klass_bitmap = 0;
165
166 // These variables are guarded by FullGCALot_lock.
167 debug_only(OopHandle Universe::_fullgc_alot_dummy_array;)
168 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
169
170 // Heap
171 int Universe::_verify_count = 0;
172
173 // Oop verification (see MacroAssembler::verify_oop)
174 uintptr_t Universe::_verify_oop_mask = 0;
175 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
176
177 int Universe::_base_vtable_size = 0;
178 bool Universe::_bootstrapping = false;
179 bool Universe::_module_initialized = false;
180 bool Universe::_fully_initialized = false;
181
182 OopStorage* Universe::_vm_weak = nullptr;
183 OopStorage* Universe::_vm_global = nullptr;
184
185 CollectedHeap* Universe::_collectedHeap = nullptr;
186
187 // These are the exceptions that are always created and are guatanteed to exist.
188 // If possible, they can be stored as CDS archived objects to speed up AOT code.
189 class BuiltinException {
190 OopHandle _instance;
191 CDS_JAVA_HEAP_ONLY(int _archived_root_index;)
192
193 public:
194 BuiltinException() : _instance() {
195 CDS_JAVA_HEAP_ONLY(_archived_root_index = 0);
196 }
197
198 void init_if_empty(Symbol* symbol, TRAPS) {
199 if (_instance.is_empty()) {
200 Klass* k = SystemDictionary::resolve_or_fail(symbol, true, CHECK);
201 oop obj = InstanceKlass::cast(k)->allocate_instance(CHECK);
202 _instance = OopHandle(Universe::vm_global(), obj);
203 }
204 }
205
206 oop instance() {
207 return _instance.resolve();
208 }
209
210 #if INCLUDE_CDS_JAVA_HEAP
211 void store_in_cds() {
212 _archived_root_index = HeapShared::archive_exception_instance(instance());
213 }
214
215 void load_from_cds() {
216 if (_archived_root_index >= 0) {
217 oop obj = HeapShared::get_root(_archived_root_index);
218 assert(obj != nullptr, "must be");
219 _instance = OopHandle(Universe::vm_global(), obj);
220 }
221 }
222
223 void serialize(SerializeClosure *f) {
224 f->do_int(&_archived_root_index);
225 }
226 #endif
227 };
228
229 static BuiltinException _null_ptr_exception;
230 static BuiltinException _arithmetic_exception;
231 static BuiltinException _internal_error;
232 static BuiltinException _array_index_out_of_bounds_exception;
233 static BuiltinException _array_store_exception;
234 static BuiltinException _class_cast_exception;
235
236 objArrayOop Universe::the_empty_class_array () {
237 return (objArrayOop)_the_empty_class_array.resolve();
238 }
239
240 oop Universe::main_thread_group() { return _main_thread_group.resolve(); }
241 void Universe::set_main_thread_group(oop group) { _main_thread_group = OopHandle(vm_global(), group); }
242
243 oop Universe::system_thread_group() { return _system_thread_group.resolve(); }
244 void Universe::set_system_thread_group(oop group) { _system_thread_group = OopHandle(vm_global(), group); }
245
246 oop Universe::the_null_string() { return _the_null_string.resolve(); }
247 oop Universe::the_min_jint_string() { return _the_min_jint_string.resolve(); }
248
249 oop Universe::null_ptr_exception_instance() { return _null_ptr_exception.instance(); }
250 oop Universe::arithmetic_exception_instance() { return _arithmetic_exception.instance(); }
251 oop Universe::internal_error_instance() { return _internal_error.instance(); }
252 oop Universe::array_index_out_of_bounds_exception_instance() { return _array_index_out_of_bounds_exception.instance(); }
253 oop Universe::array_store_exception_instance() { return _array_store_exception.instance(); }
254 oop Universe::class_cast_exception_instance() { return _class_cast_exception.instance(); }
255
256 oop Universe::the_null_sentinel() { return _the_null_sentinel.resolve(); }
257
258 oop Universe::int_mirror() { return check_mirror(_basic_type_mirrors[T_INT].resolve()); }
259 oop Universe::float_mirror() { return check_mirror(_basic_type_mirrors[T_FLOAT].resolve()); }
260 oop Universe::double_mirror() { return check_mirror(_basic_type_mirrors[T_DOUBLE].resolve()); }
261 oop Universe::byte_mirror() { return check_mirror(_basic_type_mirrors[T_BYTE].resolve()); }
262 oop Universe::bool_mirror() { return check_mirror(_basic_type_mirrors[T_BOOLEAN].resolve()); }
263 oop Universe::char_mirror() { return check_mirror(_basic_type_mirrors[T_CHAR].resolve()); }
264 oop Universe::long_mirror() { return check_mirror(_basic_type_mirrors[T_LONG].resolve()); }
265 oop Universe::short_mirror() { return check_mirror(_basic_type_mirrors[T_SHORT].resolve()); }
266 oop Universe::void_mirror() { return check_mirror(_basic_type_mirrors[T_VOID].resolve()); }
267
268 oop Universe::java_mirror(BasicType t) {
269 assert((uint)t < T_VOID+1, "range check");
270 assert(!is_reference_type(t), "sanity");
271 return check_mirror(_basic_type_mirrors[t].resolve());
272 }
273
274 void Universe::basic_type_classes_do(KlassClosure *closure) {
275 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
276 closure->do_klass(_typeArrayKlasses[i]);
277 }
278 // We don't do the following because it will confuse JVMTI.
279 // _fillerArrayKlass is used only by GC, which doesn't need to see
280 // this klass from basic_type_classes_do().
281 //
282 // closure->do_klass(_fillerArrayKlass);
283 }
284
285 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
286 it->push(&_fillerArrayKlass);
287 for (int i = 0; i < T_LONG+1; i++) {
288 it->push(&_typeArrayKlasses[i]);
289 }
290 it->push(&_objectArrayKlass);
291
292 it->push(&_the_empty_int_array);
293 it->push(&_the_empty_short_array);
294 it->push(&_the_empty_klass_array);
295 it->push(&_the_empty_instance_klass_array);
296 it->push(&_the_empty_method_array);
297 it->push(&_the_array_interfaces_array);
298 }
299
300 #if INCLUDE_CDS_JAVA_HEAP
301 void Universe::set_archived_basic_type_mirror_index(BasicType t, int index) {
302 assert(CDSConfig::is_dumping_heap(), "sanity");
303 assert(!is_reference_type(t), "sanity");
304 _archived_basic_type_mirror_indices[t] = index;
305 }
306
307 void Universe::archive_exception_instances() {
308 _null_ptr_exception.store_in_cds();
309 _arithmetic_exception.store_in_cds();
310 _internal_error.store_in_cds();
311 _array_index_out_of_bounds_exception.store_in_cds();
312 _array_store_exception.store_in_cds();
313 _class_cast_exception.store_in_cds();
314 }
315
316 void Universe::load_archived_object_instances() {
317 if (ArchiveHeapLoader::is_in_use()) {
318 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
319 int index = _archived_basic_type_mirror_indices[i];
320 if (!is_reference_type((BasicType)i) && index >= 0) {
321 oop mirror_oop = HeapShared::get_root(index);
322 assert(mirror_oop != nullptr, "must be");
323 _basic_type_mirrors[i] = OopHandle(vm_global(), mirror_oop);
324 }
325 }
326
327 _null_ptr_exception.load_from_cds();
328 _arithmetic_exception.load_from_cds();
329 _internal_error.load_from_cds();
330 _array_index_out_of_bounds_exception.load_from_cds();
331 _array_store_exception.load_from_cds();
332 _class_cast_exception.load_from_cds();
333 }
334 }
335 #endif
336
337 void Universe::serialize(SerializeClosure* f) {
338
339 #if INCLUDE_CDS_JAVA_HEAP
340 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
341 f->do_int(&_archived_basic_type_mirror_indices[i]);
342 // if f->reading(): We can't call HeapShared::get_root() yet, as the heap
343 // contents may need to be relocated. _basic_type_mirrors[i] will be
344 // updated later in Universe::load_archived_object_instances().
345 }
346 _null_ptr_exception.serialize(f);
347 _arithmetic_exception.serialize(f);
348 _internal_error.serialize(f);
349 _array_index_out_of_bounds_exception.serialize(f);
350 _array_store_exception.serialize(f);
351 _class_cast_exception.serialize(f);
352 #endif
353
354 f->do_ptr(&_fillerArrayKlass);
355 for (int i = 0; i < T_LONG+1; i++) {
356 f->do_ptr(&_typeArrayKlasses[i]);
357 }
358
359 f->do_ptr(&_objectArrayKlass);
360 f->do_ptr(&_the_array_interfaces_array);
361 f->do_ptr(&_the_empty_int_array);
362 f->do_ptr(&_the_empty_short_array);
363 f->do_ptr(&_the_empty_method_array);
364 f->do_ptr(&_the_empty_klass_array);
365 f->do_ptr(&_the_empty_instance_klass_array);
366 }
367
368
369 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
370 if (size < alignment || size % alignment != 0) {
371 vm_exit_during_initialization(
372 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
373 }
374 }
375
376 static void initialize_basic_type_klass(Klass* k, TRAPS) {
377 Klass* ok = vmClasses::Object_klass();
378 #if INCLUDE_CDS
379 if (CDSConfig::is_using_archive()) {
380 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
381 assert(k->super() == ok, "u3");
382 if (k->is_instance_klass()) {
383 InstanceKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), nullptr, CHECK);
384 } else {
385 ArrayKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), CHECK);
386 }
387 } else
388 #endif
389 {
390 k->initialize_supers(ok, nullptr, CHECK);
391 }
392 k->append_to_sibling_list();
393 }
394
395 void Universe::genesis(TRAPS) {
396 ResourceMark rm(THREAD);
397 HandleMark hm(THREAD);
398
399 // Explicit null checks are needed if these offsets are not smaller than the page size
400 assert(oopDesc::klass_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()),
401 "Klass offset is expected to be less than the page size");
402 assert(arrayOopDesc::length_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()),
403 "Array length offset is expected to be less than the page size");
404
405 { AutoModifyRestore<bool> temporarily(_bootstrapping, true);
406
407 java_lang_Class::allocate_fixup_lists();
408
409 // determine base vtable size; without that we cannot create the array klasses
410 compute_base_vtable_size();
411
412 if (!CDSConfig::is_using_archive()) {
413 // Initialization of the fillerArrayKlass must come before regular
414 // int-TypeArrayKlass so that the int-Array mirror points to the
415 // int-TypeArrayKlass.
416 _fillerArrayKlass = TypeArrayKlass::create_klass(T_INT, "[Ljdk/internal/vm/FillerElement;", CHECK);
417 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
418 _typeArrayKlasses[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK);
419 }
420
421 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
422
423 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, nullptr, CHECK);
424 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
425 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
426 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
427 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
428 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK);
429 }
430
431 vmSymbols::initialize();
432
433 SystemDictionary::initialize(CHECK);
434
435 // Create string constants
436 oop s = StringTable::intern("null", CHECK);
437 _the_null_string = OopHandle(vm_global(), s);
438 s = StringTable::intern("-2147483648", CHECK);
439 _the_min_jint_string = OopHandle(vm_global(), s);
440
441
442 #if INCLUDE_CDS
443 if (CDSConfig::is_using_archive()) {
444 // Verify shared interfaces array.
445 assert(_the_array_interfaces_array->at(0) ==
446 vmClasses::Cloneable_klass(), "u3");
447 assert(_the_array_interfaces_array->at(1) ==
448 vmClasses::Serializable_klass(), "u3");
449 } else
450 #endif
451 {
452 // Set up shared interfaces array. (Do this before supers are set up.)
453 _the_array_interfaces_array->at_put(0, vmClasses::Cloneable_klass());
454 _the_array_interfaces_array->at_put(1, vmClasses::Serializable_klass());
455 }
456
457 if (UseSecondarySupersTable) {
458 Universe::_the_array_interfaces_bitmap = Klass::compute_secondary_supers_bitmap(_the_array_interfaces_array);
459 Universe::_the_empty_klass_bitmap = Klass::compute_secondary_supers_bitmap(_the_empty_klass_array);
460 }
461
462 initialize_basic_type_klass(_fillerArrayKlass, CHECK);
463
464 initialize_basic_type_klass(boolArrayKlass(), CHECK);
465 initialize_basic_type_klass(charArrayKlass(), CHECK);
466 initialize_basic_type_klass(floatArrayKlass(), CHECK);
467 initialize_basic_type_klass(doubleArrayKlass(), CHECK);
468 initialize_basic_type_klass(byteArrayKlass(), CHECK);
469 initialize_basic_type_klass(shortArrayKlass(), CHECK);
470 initialize_basic_type_klass(intArrayKlass(), CHECK);
471 initialize_basic_type_klass(longArrayKlass(), CHECK);
472
473 assert(_fillerArrayKlass != intArrayKlass(),
474 "Internal filler array klass should be different to int array Klass");
475 } // end of core bootstrapping
476
477 {
478 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
479 _the_null_sentinel = OopHandle(vm_global(), tns());
480 }
481
482 // Create a handle for reference_pending_list
483 _reference_pending_list = OopHandle(vm_global(), nullptr);
484
485 // Maybe this could be lifted up now that object array can be initialized
486 // during the bootstrapping.
487
488 // OLD
489 // Initialize _objectArrayKlass after core bootstraping to make
490 // sure the super class is set up properly for _objectArrayKlass.
491 // ---
492 // NEW
493 // Since some of the old system object arrays have been converted to
494 // ordinary object arrays, _objectArrayKlass will be loaded when
495 // SystemDictionary::initialize(CHECK); is run. See the extra check
496 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
497 {
498 Klass* oak = vmClasses::Object_klass()->array_klass(CHECK);
499 _objectArrayKlass = ObjArrayKlass::cast(oak);
500 }
501 // OLD
502 // Add the class to the class hierarchy manually to make sure that
503 // its vtable is initialized after core bootstrapping is completed.
504 // ---
505 // New
506 // Have already been initialized.
507 _objectArrayKlass->append_to_sibling_list();
508
509 #ifdef ASSERT
510 if (FullGCALot) {
511 // Allocate an array of dummy objects.
512 // We'd like these to be at the bottom of the old generation,
513 // so that when we free one and then collect,
514 // (almost) the whole heap moves
515 // and we find out if we actually update all the oops correctly.
516 // But we can't allocate directly in the old generation,
517 // so we allocate wherever, and hope that the first collection
518 // moves these objects to the bottom of the old generation.
519 int size = FullGCALotDummies * 2;
520
521 objArrayOop naked_array = oopFactory::new_objArray(vmClasses::Object_klass(), size, CHECK);
522 objArrayHandle dummy_array(THREAD, naked_array);
523 int i = 0;
524 while (i < size) {
525 // Allocate dummy in old generation
526 oop dummy = vmClasses::Object_klass()->allocate_instance(CHECK);
527 dummy_array->obj_at_put(i++, dummy);
528 }
529 {
530 // Only modify the global variable inside the mutex.
531 // If we had a race to here, the other dummy_array instances
532 // and their elements just get dropped on the floor, which is fine.
533 MutexLocker ml(THREAD, FullGCALot_lock);
534 if (_fullgc_alot_dummy_array.is_empty()) {
535 _fullgc_alot_dummy_array = OopHandle(vm_global(), dummy_array());
536 }
537 }
538 assert(i == ((objArrayOop)_fullgc_alot_dummy_array.resolve())->length(), "just checking");
539 }
540 #endif
541 }
542
543 void Universe::initialize_basic_type_mirrors(TRAPS) {
544 #if INCLUDE_CDS_JAVA_HEAP
545 if (CDSConfig::is_using_archive() &&
546 ArchiveHeapLoader::is_in_use() &&
547 _basic_type_mirrors[T_INT].resolve() != nullptr) {
548 assert(ArchiveHeapLoader::can_use(), "Sanity");
549
550 // check that all basic type mirrors are mapped also
551 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
552 if (!is_reference_type((BasicType)i)) {
553 oop m = _basic_type_mirrors[i].resolve();
554 assert(m != nullptr, "archived mirrors should not be null");
555 }
556 }
557 } else
558 // _basic_type_mirrors[T_INT], etc, are null if archived heap is not mapped.
559 #endif
560 {
561 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
562 BasicType bt = (BasicType)i;
563 if (!is_reference_type(bt)) {
564 oop m = java_lang_Class::create_basic_type_mirror(type2name(bt), bt, CHECK);
565 _basic_type_mirrors[i] = OopHandle(vm_global(), m);
566 }
567 CDS_JAVA_HEAP_ONLY(_archived_basic_type_mirror_indices[i] = -1);
568 }
569 }
570 if (CDSConfig::is_dumping_heap()) {
571 HeapShared::init_scratch_objects(CHECK);
572 }
573 }
574
575 void Universe::fixup_mirrors(TRAPS) {
576 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
577 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
578 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
579 // that the number of objects allocated at this point is very small.
580 assert(vmClasses::Class_klass_loaded(), "java.lang.Class should be loaded");
581 HandleMark hm(THREAD);
582
583 if (!CDSConfig::is_using_archive()) {
584 // Cache the start of the static fields
585 InstanceMirrorKlass::init_offset_of_static_fields();
586 }
587
588 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
589 int list_length = list->length();
590 for (int i = 0; i < list_length; i++) {
591 Klass* k = list->at(i);
592 assert(k->is_klass(), "List should only hold classes");
593 java_lang_Class::fixup_mirror(k, CATCH);
594 }
595 delete java_lang_Class::fixup_mirror_list();
596 java_lang_Class::set_fixup_mirror_list(nullptr);
597 }
598
599 #define assert_pll_locked(test) \
600 assert(Heap_lock->test(), "Reference pending list access requires lock")
601
602 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
603
604 oop Universe::reference_pending_list() {
605 if (Thread::current()->is_VM_thread()) {
606 assert_pll_locked(is_locked);
607 } else {
608 assert_pll_ownership();
609 }
610 return _reference_pending_list.resolve();
611 }
612
613 void Universe::clear_reference_pending_list() {
614 assert_pll_ownership();
615 _reference_pending_list.replace(nullptr);
616 }
617
618 bool Universe::has_reference_pending_list() {
619 assert_pll_ownership();
620 return _reference_pending_list.peek() != nullptr;
621 }
622
623 oop Universe::swap_reference_pending_list(oop list) {
624 assert_pll_locked(is_locked);
625 return _reference_pending_list.xchg(list);
626 }
627
628 #undef assert_pll_locked
629 #undef assert_pll_ownership
630
631 static void reinitialize_vtables() {
632 // The vtables are initialized by starting at java.lang.Object and
633 // initializing through the subclass links, so that the super
634 // classes are always initialized first.
635 for (ClassHierarchyIterator iter(vmClasses::Object_klass()); !iter.done(); iter.next()) {
636 Klass* sub = iter.klass();
637 sub->vtable().initialize_vtable();
638 }
639 }
640
641 static void reinitialize_itables() {
642
643 class ReinitTableClosure : public KlassClosure {
644 public:
645 void do_klass(Klass* k) {
646 if (k->is_instance_klass()) {
647 InstanceKlass::cast(k)->itable().initialize_itable();
648 }
649 }
650 };
651
652 MutexLocker mcld(ClassLoaderDataGraph_lock);
653 ReinitTableClosure cl;
654 ClassLoaderDataGraph::classes_do(&cl);
655 }
656
657 bool Universe::on_page_boundary(void* addr) {
658 return is_aligned(addr, os::vm_page_size());
659 }
660
661 // the array of preallocated errors with backtraces
662 objArrayOop Universe::preallocated_out_of_memory_errors() {
663 return (objArrayOop)_preallocated_out_of_memory_error_array.resolve();
664 }
665
666 objArrayOop Universe::out_of_memory_errors() { return (objArrayOop)_out_of_memory_errors.resolve(); }
667
668 oop Universe::out_of_memory_error_java_heap() {
669 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_java_heap));
670 }
671
672 oop Universe::out_of_memory_error_java_heap_without_backtrace() {
673 return out_of_memory_errors()->obj_at(_oom_java_heap);
674 }
675
676 oop Universe::out_of_memory_error_c_heap() {
677 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_c_heap));
678 }
679
680 oop Universe::out_of_memory_error_metaspace() {
681 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_metaspace));
682 }
683
684 oop Universe::out_of_memory_error_class_metaspace() {
685 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_class_metaspace));
686 }
687
688 oop Universe::out_of_memory_error_array_size() {
689 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_array_size));
690 }
691
692 oop Universe::out_of_memory_error_gc_overhead_limit() {
693 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_gc_overhead_limit));
694 }
695
696 oop Universe::out_of_memory_error_realloc_objects() {
697 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_realloc_objects));
698 }
699
700 oop Universe::class_init_out_of_memory_error() { return out_of_memory_errors()->obj_at(_oom_java_heap); }
701 oop Universe::class_init_stack_overflow_error() { return _class_init_stack_overflow_error.resolve(); }
702 oop Universe::delayed_stack_overflow_error_message() { return _delayed_stack_overflow_error_message.resolve(); }
703
704
705 bool Universe::should_fill_in_stack_trace(Handle throwable) {
706 // never attempt to fill in the stack trace of preallocated errors that do not have
707 // backtrace. These errors are kept alive forever and may be "re-used" when all
708 // preallocated errors with backtrace have been consumed. Also need to avoid
709 // a potential loop which could happen if an out of memory occurs when attempting
710 // to allocate the backtrace.
711 objArrayOop preallocated_oom = out_of_memory_errors();
712 for (int i = 0; i < _oom_count; i++) {
713 if (throwable() == preallocated_oom->obj_at(i)) {
714 return false;
715 }
716 }
717 return true;
718 }
719
720
721 oop Universe::gen_out_of_memory_error(oop default_err) {
722 // generate an out of memory error:
723 // - if there is a preallocated error and stack traces are available
724 // (j.l.Throwable is initialized), then return the preallocated
725 // error with a filled in stack trace, and with the message
726 // provided by the default error.
727 // - otherwise, return the default error, without a stack trace.
728 int next;
729 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
730 vmClasses::Throwable_klass()->is_initialized()) {
731 next = (int)Atomic::add(&_preallocated_out_of_memory_error_avail_count, -1);
732 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
733 } else {
734 next = -1;
735 }
736 if (next < 0) {
737 // all preallocated errors have been used.
738 // return default
739 return default_err;
740 } else {
741 JavaThread* current = JavaThread::current();
742 Handle default_err_h(current, default_err);
743 // get the error object at the slot and set set it to null so that the
744 // array isn't keeping it alive anymore.
745 Handle exc(current, preallocated_out_of_memory_errors()->obj_at(next));
746 assert(exc() != nullptr, "slot has been used already");
747 preallocated_out_of_memory_errors()->obj_at_put(next, nullptr);
748
749 // use the message from the default error
750 oop msg = java_lang_Throwable::message(default_err_h());
751 assert(msg != nullptr, "no message");
752 java_lang_Throwable::set_message(exc(), msg);
753
754 // populate the stack trace and return it.
755 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
756 return exc();
757 }
758 }
759
760 bool Universe::is_out_of_memory_error_metaspace(oop ex_obj) {
761 return java_lang_Throwable::message(ex_obj) == _msg_metaspace.resolve();
762 }
763
764 bool Universe::is_out_of_memory_error_class_metaspace(oop ex_obj) {
765 return java_lang_Throwable::message(ex_obj) == _msg_class_metaspace.resolve();
766 }
767
768 // Setup preallocated OutOfMemoryError errors
769 void Universe::create_preallocated_out_of_memory_errors(TRAPS) {
770 InstanceKlass* ik = vmClasses::OutOfMemoryError_klass();
771 objArrayOop oa = oopFactory::new_objArray(ik, _oom_count, CHECK);
772 objArrayHandle oom_array(THREAD, oa);
773
774 for (int i = 0; i < _oom_count; i++) {
775 oop oom_obj = ik->allocate_instance(CHECK);
776 oom_array->obj_at_put(i, oom_obj);
777 }
778 _out_of_memory_errors = OopHandle(vm_global(), oom_array());
779
780 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK);
781 java_lang_Throwable::set_message(oom_array->obj_at(_oom_java_heap), msg());
782
783 msg = java_lang_String::create_from_str("C heap space", CHECK);
784 java_lang_Throwable::set_message(oom_array->obj_at(_oom_c_heap), msg());
785
786 msg = java_lang_String::create_from_str("Metaspace", CHECK);
787 _msg_metaspace = OopHandle(vm_global(), msg());
788 java_lang_Throwable::set_message(oom_array->obj_at(_oom_metaspace), msg());
789
790 msg = java_lang_String::create_from_str("Compressed class space", CHECK);
791 _msg_class_metaspace = OopHandle(vm_global(), msg());
792 java_lang_Throwable::set_message(oom_array->obj_at(_oom_class_metaspace), msg());
793
794 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK);
795 java_lang_Throwable::set_message(oom_array->obj_at(_oom_array_size), msg());
796
797 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK);
798 java_lang_Throwable::set_message(oom_array->obj_at(_oom_gc_overhead_limit), msg());
799
800 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK);
801 java_lang_Throwable::set_message(oom_array->obj_at(_oom_realloc_objects), msg());
802
803 // Setup the array of errors that have preallocated backtrace
804 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
805 objArrayOop instance = oopFactory::new_objArray(ik, len, CHECK);
806 _preallocated_out_of_memory_error_array = OopHandle(vm_global(), instance);
807 objArrayHandle preallocated_oom_array(THREAD, instance);
808
809 for (int i=0; i<len; i++) {
810 oop err = ik->allocate_instance(CHECK);
811 Handle err_h(THREAD, err);
812 java_lang_Throwable::allocate_backtrace(err_h, CHECK);
813 preallocated_oom_array->obj_at_put(i, err_h());
814 }
815 _preallocated_out_of_memory_error_avail_count = (jint)len;
816 }
817
818 intptr_t Universe::_non_oop_bits = 0;
819
820 void* Universe::non_oop_word() {
821 // Neither the high bits nor the low bits of this value is allowed
822 // to look like (respectively) the high or low bits of a real oop.
823 //
824 // High and low are CPU-specific notions, but low always includes
825 // the low-order bit. Since oops are always aligned at least mod 4,
826 // setting the low-order bit will ensure that the low half of the
827 // word will never look like that of a real oop.
828 //
829 // Using the OS-supplied non-memory-address word (usually 0 or -1)
830 // will take care of the high bits, however many there are.
831
832 if (_non_oop_bits == 0) {
833 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
834 }
835
836 return (void*)_non_oop_bits;
837 }
838
839 bool Universe::contains_non_oop_word(void* p) {
840 return *(void**)p == non_oop_word();
841 }
842
843 static void initialize_global_behaviours() {
844 DefaultICProtectionBehaviour* protection_behavior = new DefaultICProtectionBehaviour();
845 // Ignore leak of DefaultICProtectionBehaviour. It is overriden by some GC implementations and the
846 // pointer is leaked once.
847 LSAN_IGNORE_OBJECT(protection_behavior);
848 CompiledICProtectionBehaviour::set_current(protection_behavior);
849 }
850
851 jint universe_init() {
852 assert(!Universe::_fully_initialized, "called after initialize_vtables");
853 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
854 "LogHeapWordSize is incorrect.");
855 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
856 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
857 "oop size is not not a multiple of HeapWord size");
858
859 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
860
861 initialize_global_behaviours();
862
863 GCLogPrecious::initialize();
864
865 // Initialize CPUTimeCounters object, which must be done before creation of the heap.
866 CPUTimeCounters::initialize();
867
868 #ifdef _LP64
869 MetaspaceShared::adjust_heap_sizes_for_dumping();
870 #endif // _LP64
871
872 GCConfig::arguments()->initialize_heap_sizes();
873
874 jint status = Universe::initialize_heap();
875 if (status != JNI_OK) {
876 return status;
877 }
878
879 Universe::initialize_tlab();
880
881 Metaspace::global_initialize();
882
883 // Initialize performance counters for metaspaces
884 MetaspaceCounters::initialize_performance_counters();
885
886 // Checks 'AfterMemoryInit' constraints.
887 if (!JVMFlagLimit::check_all_constraints(JVMFlagConstraintPhase::AfterMemoryInit)) {
888 return JNI_EINVAL;
889 }
890
891 ClassLoaderData::init_null_class_loader_data();
892
893 #if INCLUDE_CDS
894 DynamicArchive::check_for_dynamic_dump();
895 if (CDSConfig::is_using_archive()) {
896 // Read the data structures supporting the shared spaces (shared
897 // system dictionary, symbol table, etc.)
898 MetaspaceShared::initialize_shared_spaces();
899 }
900 if (CDSConfig::is_dumping_archive()) {
901 MetaspaceShared::prepare_for_dumping();
902 }
903 #endif
904
905 SymbolTable::create_table();
906 StringTable::create_table();
907
908 if (strlen(VerifySubSet) > 0) {
909 Universe::initialize_verify_flags();
910 }
911
912 ResolvedMethodTable::create_table();
913
914 return JNI_OK;
915 }
916
917 jint Universe::initialize_heap() {
918 assert(_collectedHeap == nullptr, "Heap already created");
919 _collectedHeap = GCConfig::arguments()->create_heap();
920
921 log_info(gc)("Using %s", _collectedHeap->name());
922 return _collectedHeap->initialize();
923 }
924
925 void Universe::initialize_tlab() {
926 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
927 PLAB::startup_initialization();
928 if (UseTLAB) {
929 ThreadLocalAllocBuffer::startup_initialization();
930 }
931 }
932
933 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
934
935 assert(alignment <= Arguments::conservative_max_heap_alignment(),
936 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
937 alignment, Arguments::conservative_max_heap_alignment());
938
939 size_t total_reserved = align_up(heap_size, alignment);
940 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
941 "heap size is too big for compressed oops");
942
943 size_t page_size = os::vm_page_size();
944 if (UseLargePages && is_aligned(alignment, os::large_page_size())) {
945 page_size = os::large_page_size();
946 } else {
947 // Parallel is the only collector that might opt out of using large pages
948 // for the heap.
949 assert(!UseLargePages || UseParallelGC , "Wrong alignment to use large pages");
950 }
951
952 // Now create the space.
953 ReservedHeapSpace total_rs(total_reserved, alignment, page_size, AllocateHeapAt);
954
955 if (total_rs.is_reserved()) {
956 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
957 "must be exactly of required size and alignment");
958 // We are good.
959
960 if (AllocateHeapAt != nullptr) {
961 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
962 }
963
964 if (UseCompressedOops) {
965 CompressedOops::initialize(total_rs);
966 }
967
968 Universe::calculate_verify_data((HeapWord*)total_rs.base(), (HeapWord*)total_rs.end());
969
970 return total_rs;
971 }
972
973 vm_exit_during_initialization(
974 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
975 total_reserved/K));
976
977 // satisfy compiler
978 ShouldNotReachHere();
979 return ReservedHeapSpace(0, 0, os::vm_page_size());
980 }
981
982 OopStorage* Universe::vm_weak() {
983 return Universe::_vm_weak;
984 }
985
986 OopStorage* Universe::vm_global() {
987 return Universe::_vm_global;
988 }
989
990 void Universe::oopstorage_init() {
991 Universe::_vm_global = OopStorageSet::create_strong("VM Global", mtInternal);
992 Universe::_vm_weak = OopStorageSet::create_weak("VM Weak", mtInternal);
993 }
994
995 void universe_oopstorage_init() {
996 Universe::oopstorage_init();
997 }
998
999 void LatestMethodCache::init(JavaThread* current, InstanceKlass* ik,
1000 const char* method, Symbol* signature, bool is_static)
1001 {
1002 TempNewSymbol name = SymbolTable::new_symbol(method);
1003 Method* m = nullptr;
1004 // The klass must be linked before looking up the method.
1005 if (!ik->link_class_or_fail(current) ||
1006 ((m = ik->find_method(name, signature)) == nullptr) ||
1007 is_static != m->is_static()) {
1008 ResourceMark rm(current);
1009 // NoSuchMethodException doesn't actually work because it tries to run the
1010 // <init> function before java_lang_Class is linked. Print error and exit.
1011 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
1012 ik->name()->as_C_string(), method));
1013 }
1014
1015 _klass = ik;
1016 _method_idnum = m->method_idnum();
1017 assert(_method_idnum >= 0, "sanity check");
1018 }
1019
1020 Method* LatestMethodCache::get_method() {
1021 if (_klass == nullptr) {
1022 return nullptr;
1023 } else {
1024 Method* m = _klass->method_with_idnum(_method_idnum);
1025 assert(m != nullptr, "sanity check");
1026 return m;
1027 }
1028 }
1029
1030 Method* Universe::finalizer_register_method() { return _finalizer_register_cache.get_method(); }
1031 Method* Universe::loader_addClass_method() { return _loader_addClass_cache.get_method(); }
1032 Method* Universe::throw_illegal_access_error() { return _throw_illegal_access_error_cache.get_method(); }
1033 Method* Universe::throw_no_such_method_error() { return _throw_no_such_method_error_cache.get_method(); }
1034 Method* Universe::do_stack_walk_method() { return _do_stack_walk_cache.get_method(); }
1035
1036 void Universe::initialize_known_methods(JavaThread* current) {
1037 // Set up static method for registering finalizers
1038 _finalizer_register_cache.init(current,
1039 vmClasses::Finalizer_klass(),
1040 "register",
1041 vmSymbols::object_void_signature(), true);
1042
1043 _throw_illegal_access_error_cache.init(current,
1044 vmClasses::internal_Unsafe_klass(),
1045 "throwIllegalAccessError",
1046 vmSymbols::void_method_signature(), true);
1047
1048 _throw_no_such_method_error_cache.init(current,
1049 vmClasses::internal_Unsafe_klass(),
1050 "throwNoSuchMethodError",
1051 vmSymbols::void_method_signature(), true);
1052
1053 // Set up method for registering loaded classes in class loader vector
1054 _loader_addClass_cache.init(current,
1055 vmClasses::ClassLoader_klass(),
1056 "addClass",
1057 vmSymbols::class_void_signature(), false);
1058
1059 // Set up method for stack walking
1060 _do_stack_walk_cache.init(current,
1061 vmClasses::AbstractStackWalker_klass(),
1062 "doStackWalk",
1063 vmSymbols::doStackWalk_signature(), false);
1064 }
1065
1066 void universe2_init() {
1067 EXCEPTION_MARK;
1068 Universe::genesis(CATCH);
1069 }
1070
1071 // Set after initialization of the module runtime, call_initModuleRuntime
1072 void universe_post_module_init() {
1073 Universe::_module_initialized = true;
1074 }
1075
1076 bool universe_post_init() {
1077 assert(!is_init_completed(), "Error: initialization not yet completed!");
1078 Universe::_fully_initialized = true;
1079 EXCEPTION_MARK;
1080 if (!CDSConfig::is_using_archive()) {
1081 reinitialize_vtables();
1082 reinitialize_itables();
1083 }
1084
1085 HandleMark hm(THREAD);
1086 // Setup preallocated empty java.lang.Class array for Method reflection.
1087
1088 objArrayOop the_empty_class_array = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_false);
1089 Universe::_the_empty_class_array = OopHandle(Universe::vm_global(), the_empty_class_array);
1090
1091 // Setup preallocated OutOfMemoryError errors
1092 Universe::create_preallocated_out_of_memory_errors(CHECK_false);
1093
1094 oop instance;
1095 // Setup preallocated cause message for delayed StackOverflowError
1096 if (StackReservedPages > 0) {
1097 instance = java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
1098 Universe::_delayed_stack_overflow_error_message = OopHandle(Universe::vm_global(), instance);
1099 }
1100
1101 // Setup preallocated exceptions used for a cheap & dirty solution in compiler exception handling
1102 _null_ptr_exception.init_if_empty(vmSymbols::java_lang_NullPointerException(), CHECK_false);
1103 _arithmetic_exception.init_if_empty(vmSymbols::java_lang_ArithmeticException(), CHECK_false);
1104 _array_index_out_of_bounds_exception.init_if_empty(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), CHECK_false);
1105 _array_store_exception.init_if_empty(vmSymbols::java_lang_ArrayStoreException(), CHECK_false);
1106 _class_cast_exception.init_if_empty(vmSymbols::java_lang_ClassCastException(), CHECK_false);
1107
1108 // Virtual Machine Error for when we get into a situation we can't resolve
1109 Klass* k = vmClasses::InternalError_klass();
1110 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1111 if (!linked) {
1112 tty->print_cr("Unable to link/verify InternalError class");
1113 return false; // initialization failed
1114 }
1115 _internal_error.init_if_empty(vmSymbols::java_lang_InternalError(), CHECK_false);
1116
1117 Handle msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1118 java_lang_Throwable::set_message(Universe::arithmetic_exception_instance(), msg());
1119
1120 // Setup preallocated StackOverflowError for use with class initialization failure
1121 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_StackOverflowError(), true, CHECK_false);
1122 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1123 Universe::_class_init_stack_overflow_error = OopHandle(Universe::vm_global(), instance);
1124
1125 Universe::initialize_known_methods(THREAD);
1126
1127 // This needs to be done before the first scavenge/gc, since
1128 // it's an input to soft ref clearing policy.
1129 {
1130 MutexLocker x(THREAD, Heap_lock);
1131 Universe::heap()->update_capacity_and_used_at_gc();
1132 }
1133
1134 // ("weak") refs processing infrastructure initialization
1135 Universe::heap()->post_initialize();
1136
1137 MemoryService::add_metaspace_memory_pools();
1138
1139 MemoryService::set_universe_heap(Universe::heap());
1140 #if INCLUDE_CDS
1141 MetaspaceShared::post_initialize(CHECK_false);
1142 #endif
1143 return true;
1144 }
1145
1146
1147 void Universe::compute_base_vtable_size() {
1148 _base_vtable_size = ClassLoader::compute_Object_vtable();
1149 }
1150
1151 void Universe::print_on(outputStream* st) {
1152 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1153 st->print_cr("Heap");
1154 heap()->print_on(st);
1155 }
1156
1157 void Universe::print_heap_at_SIGBREAK() {
1158 if (PrintHeapAtSIGBREAK) {
1159 print_on(tty);
1160 tty->cr();
1161 tty->flush();
1162 }
1163 }
1164
1165 void Universe::initialize_verify_flags() {
1166 verify_flags = 0;
1167 const char delimiter[] = " ,";
1168
1169 size_t length = strlen(VerifySubSet);
1170 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1171 strncpy(subset_list, VerifySubSet, length + 1);
1172 char* save_ptr;
1173
1174 char* token = strtok_r(subset_list, delimiter, &save_ptr);
1175 while (token != nullptr) {
1176 if (strcmp(token, "threads") == 0) {
1177 verify_flags |= Verify_Threads;
1178 } else if (strcmp(token, "heap") == 0) {
1179 verify_flags |= Verify_Heap;
1180 } else if (strcmp(token, "symbol_table") == 0) {
1181 verify_flags |= Verify_SymbolTable;
1182 } else if (strcmp(token, "string_table") == 0) {
1183 verify_flags |= Verify_StringTable;
1184 } else if (strcmp(token, "codecache") == 0) {
1185 verify_flags |= Verify_CodeCache;
1186 } else if (strcmp(token, "dictionary") == 0) {
1187 verify_flags |= Verify_SystemDictionary;
1188 } else if (strcmp(token, "classloader_data_graph") == 0) {
1189 verify_flags |= Verify_ClassLoaderDataGraph;
1190 } else if (strcmp(token, "metaspace") == 0) {
1191 verify_flags |= Verify_MetaspaceUtils;
1192 } else if (strcmp(token, "jni_handles") == 0) {
1193 verify_flags |= Verify_JNIHandles;
1194 } else if (strcmp(token, "codecache_oops") == 0) {
1195 verify_flags |= Verify_CodeCacheOops;
1196 } else if (strcmp(token, "resolved_method_table") == 0) {
1197 verify_flags |= Verify_ResolvedMethodTable;
1198 } else if (strcmp(token, "stringdedup") == 0) {
1199 verify_flags |= Verify_StringDedup;
1200 } else {
1201 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1202 }
1203 token = strtok_r(nullptr, delimiter, &save_ptr);
1204 }
1205 FREE_C_HEAP_ARRAY(char, subset_list);
1206 }
1207
1208 bool Universe::should_verify_subset(uint subset) {
1209 if (verify_flags & subset) {
1210 return true;
1211 }
1212 return false;
1213 }
1214
1215 void Universe::verify(VerifyOption option, const char* prefix) {
1216 COMPILER2_PRESENT(
1217 assert(!DerivedPointerTable::is_active(),
1218 "DPT should not be active during verification "
1219 "(of thread stacks below)");
1220 )
1221
1222 Thread* thread = Thread::current();
1223 ResourceMark rm(thread);
1224 HandleMark hm(thread); // Handles created during verification can be zapped
1225 _verify_count++;
1226
1227 FormatBuffer<> title("Verifying %s", prefix);
1228 GCTraceTime(Info, gc, verify) tm(title.buffer());
1229 if (should_verify_subset(Verify_Threads)) {
1230 log_debug(gc, verify)("Threads");
1231 Threads::verify();
1232 }
1233 if (should_verify_subset(Verify_Heap)) {
1234 log_debug(gc, verify)("Heap");
1235 heap()->verify(option);
1236 }
1237 if (should_verify_subset(Verify_SymbolTable)) {
1238 log_debug(gc, verify)("SymbolTable");
1239 SymbolTable::verify();
1240 }
1241 if (should_verify_subset(Verify_StringTable)) {
1242 log_debug(gc, verify)("StringTable");
1243 StringTable::verify();
1244 }
1245 if (should_verify_subset(Verify_CodeCache)) {
1246 log_debug(gc, verify)("CodeCache");
1247 CodeCache::verify();
1248 }
1249 if (should_verify_subset(Verify_SystemDictionary)) {
1250 log_debug(gc, verify)("SystemDictionary");
1251 SystemDictionary::verify();
1252 }
1253 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1254 log_debug(gc, verify)("ClassLoaderDataGraph");
1255 ClassLoaderDataGraph::verify();
1256 }
1257 if (should_verify_subset(Verify_MetaspaceUtils)) {
1258 log_debug(gc, verify)("MetaspaceUtils");
1259 DEBUG_ONLY(MetaspaceUtils::verify();)
1260 }
1261 if (should_verify_subset(Verify_JNIHandles)) {
1262 log_debug(gc, verify)("JNIHandles");
1263 JNIHandles::verify();
1264 }
1265 if (should_verify_subset(Verify_CodeCacheOops)) {
1266 log_debug(gc, verify)("CodeCache Oops");
1267 CodeCache::verify_oops();
1268 }
1269 if (should_verify_subset(Verify_ResolvedMethodTable)) {
1270 log_debug(gc, verify)("ResolvedMethodTable Oops");
1271 ResolvedMethodTable::verify();
1272 }
1273 if (should_verify_subset(Verify_StringDedup)) {
1274 log_debug(gc, verify)("String Deduplication");
1275 StringDedup::verify();
1276 }
1277 }
1278
1279
1280 #ifndef PRODUCT
1281 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1282 assert(low_boundary < high_boundary, "bad interval");
1283
1284 // decide which low-order bits we require to be clear:
1285 size_t alignSize = MinObjAlignmentInBytes;
1286 size_t min_object_size = CollectedHeap::min_fill_size();
1287
1288 // make an inclusive limit:
1289 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1290 uintptr_t min = (uintptr_t)low_boundary;
1291 assert(min < max, "bad interval");
1292 uintptr_t diff = max ^ min;
1293
1294 // throw away enough low-order bits to make the diff vanish
1295 uintptr_t mask = (uintptr_t)(-1);
1296 while ((mask & diff) != 0)
1297 mask <<= 1;
1298 uintptr_t bits = (min & mask);
1299 assert(bits == (max & mask), "correct mask");
1300 // check an intermediate value between min and max, just to make sure:
1301 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1302
1303 // require address alignment, too:
1304 mask |= (alignSize - 1);
1305
1306 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1307 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1308 }
1309 _verify_oop_mask = mask;
1310 _verify_oop_bits = bits;
1311 }
1312
1313 void Universe::set_verify_data(uintptr_t mask, uintptr_t bits) {
1314 _verify_oop_mask = mask;
1315 _verify_oop_bits = bits;
1316 }
1317
1318 // Oop verification (see MacroAssembler::verify_oop)
1319
1320 uintptr_t Universe::verify_oop_mask() {
1321 return _verify_oop_mask;
1322 }
1323
1324 uintptr_t Universe::verify_oop_bits() {
1325 return _verify_oop_bits;
1326 }
1327
1328 uintptr_t Universe::verify_mark_mask() {
1329 return markWord::lock_mask_in_place;
1330 }
1331
1332 uintptr_t Universe::verify_mark_bits() {
1333 intptr_t mask = verify_mark_mask();
1334 intptr_t bits = (intptr_t)markWord::prototype().value();
1335 assert((bits & ~mask) == 0, "no stray header bits");
1336 return bits;
1337 }
1338 #endif // PRODUCT
1339
1340 #ifdef ASSERT
1341 // Release dummy object(s) at bottom of heap
1342 bool Universe::release_fullgc_alot_dummy() {
1343 MutexLocker ml(FullGCALot_lock);
1344 objArrayOop fullgc_alot_dummy_array = (objArrayOop)_fullgc_alot_dummy_array.resolve();
1345 if (fullgc_alot_dummy_array != nullptr) {
1346 if (_fullgc_alot_dummy_next >= fullgc_alot_dummy_array->length()) {
1347 // No more dummies to release, release entire array instead
1348 _fullgc_alot_dummy_array.release(Universe::vm_global());
1349 _fullgc_alot_dummy_array = OopHandle(); // null out OopStorage pointer.
1350 return false;
1351 }
1352
1353 // Release dummy at bottom of old generation
1354 fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, nullptr);
1355 }
1356 return true;
1357 }
1358
1359 bool Universe::is_stw_gc_active() {
1360 return heap()->is_stw_gc_active();
1361 }
1362
1363 bool Universe::is_in_heap(const void* p) {
1364 return heap()->is_in(p);
1365 }
1366
1367 #endif // ASSERT