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