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