1 /*
2 * Copyright (c) 1997, 2022, 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/dynamicArchive.hpp"
28 #include "cds/heapShared.hpp"
29 #include "cds/metaspaceShared.hpp"
30 #include "classfile/classLoader.hpp"
31 #include "classfile/classLoaderDataGraph.hpp"
32 #include "classfile/javaClasses.hpp"
33 #include "classfile/stringTable.hpp"
34 #include "classfile/symbolTable.hpp"
35 #include "classfile/systemDictionary.hpp"
36 #include "classfile/vmClasses.hpp"
37 #include "classfile/vmSymbols.hpp"
38 #include "code/codeBehaviours.hpp"
39 #include "code/codeCache.hpp"
40 #include "compiler/oopMap.hpp"
41 #include "gc/shared/collectedHeap.inline.hpp"
42 #include "gc/shared/gcArguments.hpp"
43 #include "gc/shared/gcConfig.hpp"
44 #include "gc/shared/gcLogPrecious.hpp"
45 #include "gc/shared/gcTraceTime.inline.hpp"
46 #include "gc/shared/oopStorageSet.hpp"
47 #include "gc/shared/plab.hpp"
48 #include "gc/shared/stringdedup/stringDedup.hpp"
49 #include "gc/shared/tlab_globals.hpp"
50 #include "logging/log.hpp"
51 #include "logging/logStream.hpp"
52 #include "memory/metadataFactory.hpp"
53 #include "memory/metaspaceClosure.hpp"
54 #include "memory/metaspaceCounters.hpp"
55 #include "memory/metaspaceUtils.hpp"
56 #include "memory/oopFactory.hpp"
57 #include "memory/resourceArea.hpp"
58 #include "memory/universe.hpp"
59 #include "oops/compressedOops.hpp"
60 #include "oops/instanceKlass.hpp"
61 #include "oops/instanceMirrorKlass.hpp"
62 #include "oops/klass.inline.hpp"
63 #include "oops/objArrayOop.inline.hpp"
64 #include "oops/oop.inline.hpp"
65 #include "oops/oopHandle.inline.hpp"
66 #include "oops/typeArrayKlass.hpp"
67 #include "prims/resolvedMethodTable.hpp"
68 #include "runtime/arguments.hpp"
69 #include "runtime/atomic.hpp"
70 #include "runtime/flags/jvmFlagLimit.hpp"
71 #include "runtime/handles.inline.hpp"
72 #include "runtime/init.hpp"
73 #include "runtime/java.hpp"
74 #include "runtime/javaThread.hpp"
75 #include "runtime/jniHandles.hpp"
76 #include "runtime/threads.hpp"
77 #include "runtime/timerTrace.hpp"
78 #include "services/memoryService.hpp"
79 #include "utilities/align.hpp"
80 #include "utilities/autoRestore.hpp"
81 #include "utilities/debug.hpp"
82 #include "utilities/formatBuffer.hpp"
83 #include "utilities/macros.hpp"
84 #include "utilities/ostream.hpp"
85 #include "utilities/preserveException.hpp"
86
87 // Known objects
88 Klass* Universe::_typeArrayKlassObjs[T_LONG+1] = { NULL /*, NULL...*/ };
89 Klass* Universe::_objectArrayKlassObj = NULL;
90 Klass* Universe::_fillerArrayKlassObj = NULL;
91 OopHandle Universe::_basic_type_mirrors[T_VOID+1];
92 #if INCLUDE_CDS_JAVA_HEAP
93 int Universe::_archived_basic_type_mirror_indices[T_VOID+1];
94 #endif
95
96 OopHandle Universe::_main_thread_group;
97 OopHandle Universe::_system_thread_group;
98 OopHandle Universe::_the_empty_class_array;
99 OopHandle Universe::_the_null_string;
100 OopHandle Universe::_the_min_jint_string;
101
102 OopHandle Universe::_the_null_sentinel;
103
104 // _out_of_memory_errors is an objArray
105 enum OutOfMemoryInstance { _oom_java_heap,
106 _oom_c_heap,
107 _oom_metaspace,
108 _oom_class_metaspace,
109 _oom_array_size,
110 _oom_gc_overhead_limit,
111 _oom_realloc_objects,
112 _oom_retry,
113 _oom_count };
114
115 OopHandle Universe::_out_of_memory_errors;
116 OopHandle Universe::_delayed_stack_overflow_error_message;
117 OopHandle Universe::_preallocated_out_of_memory_error_array;
118 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
119
120 // Message details for OOME objects, preallocate these objects since they could be
121 // used when throwing OOME, we should try to avoid further allocation in such case
122 OopHandle Universe::_msg_metaspace;
123 OopHandle Universe::_msg_class_metaspace;
124
125 OopHandle Universe::_null_ptr_exception_instance;
126 OopHandle Universe::_arithmetic_exception_instance;
127 OopHandle Universe::_virtual_machine_error_instance;
128
129 OopHandle Universe::_reference_pending_list;
130
131 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
132 LatestMethodCache* Universe::_finalizer_register_cache = NULL;
133 LatestMethodCache* Universe::_loader_addClass_cache = NULL;
134 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL;
135 LatestMethodCache* Universe::_throw_no_such_method_error_cache = NULL;
136 LatestMethodCache* Universe::_do_stack_walk_cache = NULL;
137 LatestMethodCache* Universe::_is_substitutable_cache = NULL;
138 LatestMethodCache* Universe::_value_object_hash_code_cache = NULL;
139
140 long Universe::verify_flags = Universe::Verify_All;
141
142 Array<int>* Universe::_the_empty_int_array = NULL;
143 Array<u2>* Universe::_the_empty_short_array = NULL;
144 Array<Klass*>* Universe::_the_empty_klass_array = NULL;
145 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = NULL;
146 Array<Method*>* Universe::_the_empty_method_array = NULL;
147
148 // These variables are guarded by FullGCALot_lock.
149 debug_only(OopHandle Universe::_fullgc_alot_dummy_array;)
150 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
151
152 // Heap
153 int Universe::_verify_count = 0;
154
155 // Oop verification (see MacroAssembler::verify_oop)
156 uintptr_t Universe::_verify_oop_mask = 0;
157 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
158
159 int Universe::_base_vtable_size = 0;
160 bool Universe::_bootstrapping = false;
161 bool Universe::_module_initialized = false;
162 bool Universe::_fully_initialized = false;
163
164 OopStorage* Universe::_vm_weak = NULL;
165 OopStorage* Universe::_vm_global = NULL;
166
167 CollectedHeap* Universe::_collectedHeap = NULL;
168
169 objArrayOop Universe::the_empty_class_array () {
170 return (objArrayOop)_the_empty_class_array.resolve();
171 }
172
173 oop Universe::main_thread_group() { return _main_thread_group.resolve(); }
174 void Universe::set_main_thread_group(oop group) { _main_thread_group = OopHandle(vm_global(), group); }
175
176 oop Universe::system_thread_group() { return _system_thread_group.resolve(); }
177 void Universe::set_system_thread_group(oop group) { _system_thread_group = OopHandle(vm_global(), group); }
178
179 oop Universe::the_null_string() { return _the_null_string.resolve(); }
180 oop Universe::the_min_jint_string() { return _the_min_jint_string.resolve(); }
181
182 oop Universe::null_ptr_exception_instance() { return _null_ptr_exception_instance.resolve(); }
183 oop Universe::arithmetic_exception_instance() { return _arithmetic_exception_instance.resolve(); }
184 oop Universe::virtual_machine_error_instance() { return _virtual_machine_error_instance.resolve(); }
185
186 oop Universe::the_null_sentinel() { return _the_null_sentinel.resolve(); }
187
188 oop Universe::int_mirror() { return check_mirror(_basic_type_mirrors[T_INT].resolve()); }
189 oop Universe::float_mirror() { return check_mirror(_basic_type_mirrors[T_FLOAT].resolve()); }
190 oop Universe::double_mirror() { return check_mirror(_basic_type_mirrors[T_DOUBLE].resolve()); }
191 oop Universe::byte_mirror() { return check_mirror(_basic_type_mirrors[T_BYTE].resolve()); }
192 oop Universe::bool_mirror() { return check_mirror(_basic_type_mirrors[T_BOOLEAN].resolve()); }
193 oop Universe::char_mirror() { return check_mirror(_basic_type_mirrors[T_CHAR].resolve()); }
194 oop Universe::long_mirror() { return check_mirror(_basic_type_mirrors[T_LONG].resolve()); }
195 oop Universe::short_mirror() { return check_mirror(_basic_type_mirrors[T_SHORT].resolve()); }
196 oop Universe::void_mirror() { return check_mirror(_basic_type_mirrors[T_VOID].resolve()); }
197
198 oop Universe::java_mirror(BasicType t) {
199 assert((uint)t < T_VOID+1, "range check");
200 assert(!is_reference_type(t), "sanity");
201 return check_mirror(_basic_type_mirrors[t].resolve());
202 }
203
204 void Universe::basic_type_classes_do(KlassClosure *closure) {
205 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
206 closure->do_klass(_typeArrayKlassObjs[i]);
207 }
208 // We don't do the following because it will confuse JVMTI.
209 // _fillerArrayKlassObj is used only by GC, which doesn't need to see
210 // this klass from basic_type_classes_do().
211 //
212 // closure->do_klass(_fillerArrayKlassObj);
213 }
214
215 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
216 it->push(&_klass);
217 }
218
219 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
220 it->push(&_fillerArrayKlassObj);
221 for (int i = 0; i < T_LONG+1; i++) {
222 it->push(&_typeArrayKlassObjs[i]);
223 }
224 it->push(&_objectArrayKlassObj);
225
226 it->push(&_the_empty_int_array);
227 it->push(&_the_empty_short_array);
228 it->push(&_the_empty_klass_array);
229 it->push(&_the_empty_instance_klass_array);
230 it->push(&_the_empty_method_array);
231 it->push(&_the_array_interfaces_array);
232
233 _finalizer_register_cache->metaspace_pointers_do(it);
234 _loader_addClass_cache->metaspace_pointers_do(it);
235 _throw_illegal_access_error_cache->metaspace_pointers_do(it);
236 _throw_no_such_method_error_cache->metaspace_pointers_do(it);
237 _do_stack_walk_cache->metaspace_pointers_do(it);
238 _is_substitutable_cache->metaspace_pointers_do(it);
239 _value_object_hash_code_cache->metaspace_pointers_do(it);
240 }
241
242 #if INCLUDE_CDS_JAVA_HEAP
243 void Universe::set_archived_basic_type_mirror_index(BasicType t, int index) {
244 assert(DumpSharedSpaces, "dump-time only");
245 assert(!is_reference_type(t), "sanity");
246 _archived_basic_type_mirror_indices[t] = index;
247 }
248
249 void Universe::update_archived_basic_type_mirrors() {
250 if (ArchiveHeapLoader::are_archived_mirrors_available()) {
251 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
252 int index = _archived_basic_type_mirror_indices[i];
253 if (!is_reference_type((BasicType)i) && index >= 0) {
254 oop mirror_oop = HeapShared::get_root(index);
255 assert(mirror_oop != NULL, "must be");
256 _basic_type_mirrors[i] = OopHandle(vm_global(), mirror_oop);
257 }
258 }
259 }
260 }
261 #endif
262
263 void Universe::serialize(SerializeClosure* f) {
264
265 #if INCLUDE_CDS_JAVA_HEAP
266 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
267 f->do_u4((u4*)&_archived_basic_type_mirror_indices[i]);
268 // if f->reading(): We can't call HeapShared::get_root() yet, as the heap
269 // contents may need to be relocated. _basic_type_mirrors[i] will be
270 // updated later in Universe::update_archived_basic_type_mirrors().
271 }
272 #endif
273
274 f->do_ptr((void**)&_fillerArrayKlassObj);
275 for (int i = 0; i < T_LONG+1; i++) {
276 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
277 }
278
279 f->do_ptr((void**)&_objectArrayKlassObj);
280 f->do_ptr((void**)&_the_array_interfaces_array);
281 f->do_ptr((void**)&_the_empty_int_array);
282 f->do_ptr((void**)&_the_empty_short_array);
283 f->do_ptr((void**)&_the_empty_method_array);
284 f->do_ptr((void**)&_the_empty_klass_array);
285 f->do_ptr((void**)&_the_empty_instance_klass_array);
286 _finalizer_register_cache->serialize(f);
287 _loader_addClass_cache->serialize(f);
288 _throw_illegal_access_error_cache->serialize(f);
289 _throw_no_such_method_error_cache->serialize(f);
290 _do_stack_walk_cache->serialize(f);
291 _is_substitutable_cache->serialize(f);
292 _value_object_hash_code_cache->serialize(f);
293 }
294
295
296 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
297 if (size < alignment || size % alignment != 0) {
298 vm_exit_during_initialization(
299 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
300 }
301 }
302
303 void initialize_basic_type_klass(Klass* k, TRAPS) {
304 Klass* ok = vmClasses::Object_klass();
305 #if INCLUDE_CDS
306 if (UseSharedSpaces) {
307 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
308 assert(k->super() == ok, "u3");
309 if (k->is_instance_klass()) {
310 InstanceKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), NULL, CHECK);
311 } else {
312 ArrayKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), CHECK);
313 }
314 } else
315 #endif
316 {
317 k->initialize_supers(ok, NULL, CHECK);
318 }
319 k->append_to_sibling_list();
320 }
321
322 void Universe::genesis(TRAPS) {
323 ResourceMark rm(THREAD);
324 HandleMark hm(THREAD);
325
326 { AutoModifyRestore<bool> temporarily(_bootstrapping, true);
327
328 { MutexLocker mc(THREAD, Compile_lock);
329
330 java_lang_Class::allocate_fixup_lists();
331
332 // determine base vtable size; without that we cannot create the array klasses
333 compute_base_vtable_size();
334
335 if (!UseSharedSpaces) {
336 // Initialization of the fillerArrayKlass must come before regular
337 // int-TypeArrayKlass so that the int-Array mirror points to the
338 // int-TypeArrayKlass.
339 _fillerArrayKlassObj = TypeArrayKlass::create_klass(T_INT, "Ljdk/internal/vm/FillerArray;", CHECK);
340 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
341 _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK);
342 }
343
344 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
345
346 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
347 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
348 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
349 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
350 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
351 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK);
352 }
353 }
354
355 vmSymbols::initialize();
356
357 SystemDictionary::initialize(CHECK);
358
359 // Create string constants
360 oop s = StringTable::intern("null", CHECK);
361 _the_null_string = OopHandle(vm_global(), s);
362 s = StringTable::intern("-2147483648", CHECK);
363 _the_min_jint_string = OopHandle(vm_global(), s);
364
365
366 #if INCLUDE_CDS
367 if (UseSharedSpaces) {
368 // Verify shared interfaces array.
369 assert(_the_array_interfaces_array->at(0) ==
370 vmClasses::Cloneable_klass(), "u3");
371 assert(_the_array_interfaces_array->at(1) ==
372 vmClasses::Serializable_klass(), "u3");
373
374 } else
375 #endif
376 {
377 // Set up shared interfaces array. (Do this before supers are set up.)
378 _the_array_interfaces_array->at_put(0, vmClasses::Cloneable_klass());
379 _the_array_interfaces_array->at_put(1, vmClasses::Serializable_klass());
380 }
381
382 initialize_basic_type_klass(_fillerArrayKlassObj, CHECK);
383
384 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
385 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
386 initialize_basic_type_klass(floatArrayKlassObj(), CHECK);
387 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
388 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
389 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
390 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
391 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
392
393 assert(_fillerArrayKlassObj != intArrayKlassObj(),
394 "Internal filler array klass should be different to int array Klass");
395 } // end of core bootstrapping
396
397 {
398 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
399 _the_null_sentinel = OopHandle(vm_global(), tns());
400 }
401
402 // Create a handle for reference_pending_list
403 _reference_pending_list = OopHandle(vm_global(), NULL);
404
405 // Maybe this could be lifted up now that object array can be initialized
406 // during the bootstrapping.
407
408 // OLD
409 // Initialize _objectArrayKlass after core bootstraping to make
410 // sure the super class is set up properly for _objectArrayKlass.
411 // ---
412 // NEW
413 // Since some of the old system object arrays have been converted to
414 // ordinary object arrays, _objectArrayKlass will be loaded when
415 // SystemDictionary::initialize(CHECK); is run. See the extra check
416 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
417 _objectArrayKlassObj = InstanceKlass::
418 cast(vmClasses::Object_klass())->array_klass(1, CHECK);
419 // OLD
420 // Add the class to the class hierarchy manually to make sure that
421 // its vtable is initialized after core bootstrapping is completed.
422 // ---
423 // New
424 // Have already been initialized.
425 _objectArrayKlassObj->append_to_sibling_list();
426
427 #ifdef ASSERT
428 if (FullGCALot) {
429 // Allocate an array of dummy objects.
430 // We'd like these to be at the bottom of the old generation,
431 // so that when we free one and then collect,
432 // (almost) the whole heap moves
433 // and we find out if we actually update all the oops correctly.
434 // But we can't allocate directly in the old generation,
435 // so we allocate wherever, and hope that the first collection
436 // moves these objects to the bottom of the old generation.
437 int size = FullGCALotDummies * 2;
438
439 objArrayOop naked_array = oopFactory::new_objArray(vmClasses::Object_klass(), size, CHECK);
440 objArrayHandle dummy_array(THREAD, naked_array);
441 int i = 0;
442 while (i < size) {
443 // Allocate dummy in old generation
444 oop dummy = vmClasses::Object_klass()->allocate_instance(CHECK);
445 dummy_array->obj_at_put(i++, dummy);
446 }
447 {
448 // Only modify the global variable inside the mutex.
449 // If we had a race to here, the other dummy_array instances
450 // and their elements just get dropped on the floor, which is fine.
451 MutexLocker ml(THREAD, FullGCALot_lock);
452 if (_fullgc_alot_dummy_array.is_empty()) {
453 _fullgc_alot_dummy_array = OopHandle(vm_global(), dummy_array());
454 }
455 }
456 assert(i == ((objArrayOop)_fullgc_alot_dummy_array.resolve())->length(), "just checking");
457 }
458 #endif
459 }
460
461 void Universe::initialize_basic_type_mirrors(TRAPS) {
462 #if INCLUDE_CDS_JAVA_HEAP
463 if (UseSharedSpaces &&
464 ArchiveHeapLoader::are_archived_mirrors_available() &&
465 _basic_type_mirrors[T_INT].resolve() != NULL) {
466 assert(ArchiveHeapLoader::can_use(), "Sanity");
467
468 // check that all basic type mirrors are mapped also
469 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
470 if (!is_reference_type((BasicType)i)) {
471 oop m = _basic_type_mirrors[i].resolve();
472 assert(m != NULL, "archived mirrors should not be NULL");
473 }
474 }
475 } else
476 // _basic_type_mirrors[T_INT], etc, are NULL if archived heap is not mapped.
477 #endif
478 {
479 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
480 BasicType bt = (BasicType)i;
481 if (!is_reference_type(bt)) {
482 oop m = java_lang_Class::create_basic_type_mirror(type2name(bt), bt, CHECK);
483 _basic_type_mirrors[i] = OopHandle(vm_global(), m);
484 }
485 CDS_JAVA_HEAP_ONLY(_archived_basic_type_mirror_indices[i] = -1);
486 }
487 }
488 }
489
490 void Universe::fixup_mirrors(TRAPS) {
491 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
492 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
493 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
494 // that the number of objects allocated at this point is very small.
495 assert(vmClasses::Class_klass_loaded(), "java.lang.Class should be loaded");
496 HandleMark hm(THREAD);
497
498 if (!UseSharedSpaces) {
499 // Cache the start of the static fields
500 InstanceMirrorKlass::init_offset_of_static_fields();
501 }
502
503 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
504 int list_length = list->length();
505 for (int i = 0; i < list_length; i++) {
506 Klass* k = list->at(i);
507 assert(k->is_klass(), "List should only hold classes");
508 java_lang_Class::fixup_mirror(k, CATCH);
509 }
510 delete java_lang_Class::fixup_mirror_list();
511 java_lang_Class::set_fixup_mirror_list(NULL);
512 }
513
514 #define assert_pll_locked(test) \
515 assert(Heap_lock->test(), "Reference pending list access requires lock")
516
517 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
518
519 oop Universe::reference_pending_list() {
520 if (Thread::current()->is_VM_thread()) {
521 assert_pll_locked(is_locked);
522 } else {
523 assert_pll_ownership();
524 }
525 return _reference_pending_list.resolve();
526 }
527
528 void Universe::clear_reference_pending_list() {
529 assert_pll_ownership();
530 _reference_pending_list.replace(NULL);
531 }
532
533 bool Universe::has_reference_pending_list() {
534 assert_pll_ownership();
535 return _reference_pending_list.peek() != NULL;
536 }
537
538 oop Universe::swap_reference_pending_list(oop list) {
539 assert_pll_locked(is_locked);
540 return _reference_pending_list.xchg(list);
541 }
542
543 #undef assert_pll_locked
544 #undef assert_pll_ownership
545
546 static void reinitialize_vtables() {
547 // The vtables are initialized by starting at java.lang.Object and
548 // initializing through the subclass links, so that the super
549 // classes are always initialized first.
550 for (ClassHierarchyIterator iter(vmClasses::Object_klass()); !iter.done(); iter.next()) {
551 Klass* sub = iter.klass();
552 sub->vtable().initialize_vtable();
553 }
554 }
555
556 static void reinitialize_itables() {
557
558 class ReinitTableClosure : public KlassClosure {
559 public:
560 void do_klass(Klass* k) {
561 if (k->is_instance_klass()) {
562 InstanceKlass::cast(k)->itable().initialize_itable();
563 }
564 }
565 };
566
567 MutexLocker mcld(ClassLoaderDataGraph_lock);
568 ReinitTableClosure cl;
569 ClassLoaderDataGraph::classes_do(&cl);
570 }
571
572 bool Universe::on_page_boundary(void* addr) {
573 return is_aligned(addr, os::vm_page_size());
574 }
575
576 // the array of preallocated errors with backtraces
577 objArrayOop Universe::preallocated_out_of_memory_errors() {
578 return (objArrayOop)_preallocated_out_of_memory_error_array.resolve();
579 }
580
581 objArrayOop Universe::out_of_memory_errors() { return (objArrayOop)_out_of_memory_errors.resolve(); }
582
583 oop Universe::out_of_memory_error_java_heap() {
584 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_java_heap));
585 }
586
587 oop Universe::out_of_memory_error_c_heap() {
588 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_c_heap));
589 }
590
591 oop Universe::out_of_memory_error_metaspace() {
592 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_metaspace));
593 }
594
595 oop Universe::out_of_memory_error_class_metaspace() {
596 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_class_metaspace));
597 }
598
599 oop Universe::out_of_memory_error_array_size() {
600 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_array_size));
601 }
602
603 oop Universe::out_of_memory_error_gc_overhead_limit() {
604 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_gc_overhead_limit));
605 }
606
607 oop Universe::out_of_memory_error_realloc_objects() {
608 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_realloc_objects));
609 }
610
611 // Throw default _out_of_memory_error_retry object as it will never propagate out of the VM
612 oop Universe::out_of_memory_error_retry() { return out_of_memory_errors()->obj_at(_oom_retry); }
613 oop Universe::delayed_stack_overflow_error_message() { return _delayed_stack_overflow_error_message.resolve(); }
614
615
616 bool Universe::should_fill_in_stack_trace(Handle throwable) {
617 // never attempt to fill in the stack trace of preallocated errors that do not have
618 // backtrace. These errors are kept alive forever and may be "re-used" when all
619 // preallocated errors with backtrace have been consumed. Also need to avoid
620 // a potential loop which could happen if an out of memory occurs when attempting
621 // to allocate the backtrace.
622 objArrayOop preallocated_oom = out_of_memory_errors();
623 for (int i = 0; i < _oom_count; i++) {
624 if (throwable() == preallocated_oom->obj_at(i)) {
625 return false;
626 }
627 }
628 return true;
629 }
630
631
632 oop Universe::gen_out_of_memory_error(oop default_err) {
633 // generate an out of memory error:
634 // - if there is a preallocated error and stack traces are available
635 // (j.l.Throwable is initialized), then return the preallocated
636 // error with a filled in stack trace, and with the message
637 // provided by the default error.
638 // - otherwise, return the default error, without a stack trace.
639 int next;
640 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
641 vmClasses::Throwable_klass()->is_initialized()) {
642 next = (int)Atomic::add(&_preallocated_out_of_memory_error_avail_count, -1);
643 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
644 } else {
645 next = -1;
646 }
647 if (next < 0) {
648 // all preallocated errors have been used.
649 // return default
650 return default_err;
651 } else {
652 JavaThread* current = JavaThread::current();
653 Handle default_err_h(current, default_err);
654 // get the error object at the slot and set set it to NULL so that the
655 // array isn't keeping it alive anymore.
656 Handle exc(current, preallocated_out_of_memory_errors()->obj_at(next));
657 assert(exc() != NULL, "slot has been used already");
658 preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
659
660 // use the message from the default error
661 oop msg = java_lang_Throwable::message(default_err_h());
662 assert(msg != NULL, "no message");
663 java_lang_Throwable::set_message(exc(), msg);
664
665 // populate the stack trace and return it.
666 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
667 return exc();
668 }
669 }
670
671 bool Universe::is_out_of_memory_error_metaspace(oop ex_obj) {
672 return java_lang_Throwable::message(ex_obj) == _msg_metaspace.resolve();
673 }
674
675 bool Universe::is_out_of_memory_error_class_metaspace(oop ex_obj) {
676 return java_lang_Throwable::message(ex_obj) == _msg_class_metaspace.resolve();
677 }
678
679 // Setup preallocated OutOfMemoryError errors
680 void Universe::create_preallocated_out_of_memory_errors(TRAPS) {
681 InstanceKlass* ik = vmClasses::OutOfMemoryError_klass();
682 objArrayOop oa = oopFactory::new_objArray(ik, _oom_count, CHECK);
683 objArrayHandle oom_array(THREAD, oa);
684
685 for (int i = 0; i < _oom_count; i++) {
686 oop oom_obj = ik->allocate_instance(CHECK);
687 oom_array->obj_at_put(i, oom_obj);
688 }
689 _out_of_memory_errors = OopHandle(vm_global(), oom_array());
690
691 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK);
692 java_lang_Throwable::set_message(oom_array->obj_at(_oom_java_heap), msg());
693
694 msg = java_lang_String::create_from_str("C heap space", CHECK);
695 java_lang_Throwable::set_message(oom_array->obj_at(_oom_c_heap), msg());
696
697 msg = java_lang_String::create_from_str("Metaspace", CHECK);
698 _msg_metaspace = OopHandle(vm_global(), msg());
699 java_lang_Throwable::set_message(oom_array->obj_at(_oom_metaspace), msg());
700
701 msg = java_lang_String::create_from_str("Compressed class space", CHECK);
702 _msg_class_metaspace = OopHandle(vm_global(), msg());
703 java_lang_Throwable::set_message(oom_array->obj_at(_oom_class_metaspace), msg());
704
705 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK);
706 java_lang_Throwable::set_message(oom_array->obj_at(_oom_array_size), msg());
707
708 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK);
709 java_lang_Throwable::set_message(oom_array->obj_at(_oom_gc_overhead_limit), msg());
710
711 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK);
712 java_lang_Throwable::set_message(oom_array->obj_at(_oom_realloc_objects), msg());
713
714 msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK);
715 java_lang_Throwable::set_message(oom_array->obj_at(_oom_retry), msg());
716
717 // Setup the array of errors that have preallocated backtrace
718 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
719 objArrayOop instance = oopFactory::new_objArray(ik, len, CHECK);
720 _preallocated_out_of_memory_error_array = OopHandle(vm_global(), instance);
721 objArrayHandle preallocated_oom_array(THREAD, instance);
722
723 for (int i=0; i<len; i++) {
724 oop err = ik->allocate_instance(CHECK);
725 Handle err_h(THREAD, err);
726 java_lang_Throwable::allocate_backtrace(err_h, CHECK);
727 preallocated_oom_array->obj_at_put(i, err_h());
728 }
729 _preallocated_out_of_memory_error_avail_count = (jint)len;
730 }
731
732 intptr_t Universe::_non_oop_bits = 0;
733
734 void* Universe::non_oop_word() {
735 // Neither the high bits nor the low bits of this value is allowed
736 // to look like (respectively) the high or low bits of a real oop.
737 //
738 // High and low are CPU-specific notions, but low always includes
739 // the low-order bit. Since oops are always aligned at least mod 4,
740 // setting the low-order bit will ensure that the low half of the
741 // word will never look like that of a real oop.
742 //
743 // Using the OS-supplied non-memory-address word (usually 0 or -1)
744 // will take care of the high bits, however many there are.
745
746 if (_non_oop_bits == 0) {
747 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
748 }
749
750 return (void*)_non_oop_bits;
751 }
752
753 bool Universe::contains_non_oop_word(void* p) {
754 return *(void**)p == non_oop_word();
755 }
756
757 static void initialize_global_behaviours() {
758 CompiledICProtectionBehaviour::set_current(new DefaultICProtectionBehaviour());
759 }
760
761 jint universe_init() {
762 assert(!Universe::_fully_initialized, "called after initialize_vtables");
763 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
764 "LogHeapWordSize is incorrect.");
765 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
766 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
767 "oop size is not not a multiple of HeapWord size");
768
769 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
770
771 initialize_global_behaviours();
772
773 GCLogPrecious::initialize();
774
775 #ifdef _LP64
776 MetaspaceShared::adjust_heap_sizes_for_dumping();
777 #endif // _LP64
778
779 GCConfig::arguments()->initialize_heap_sizes();
780
781 jint status = Universe::initialize_heap();
782 if (status != JNI_OK) {
783 return status;
784 }
785
786 Universe::initialize_tlab();
787
788 Metaspace::global_initialize();
789 // Initialize performance counters for metaspaces
790 MetaspaceCounters::initialize_performance_counters();
791
792 // Checks 'AfterMemoryInit' constraints.
793 if (!JVMFlagLimit::check_all_constraints(JVMFlagConstraintPhase::AfterMemoryInit)) {
794 return JNI_EINVAL;
795 }
796
797 // Create memory for metadata. Must be after initializing heap for
798 // DumpSharedSpaces.
799 ClassLoaderData::init_null_class_loader_data();
800
801 // We have a heap so create the Method* caches before
802 // Metaspace::initialize_shared_spaces() tries to populate them.
803 Universe::_finalizer_register_cache = new LatestMethodCache();
804 Universe::_loader_addClass_cache = new LatestMethodCache();
805 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
806 Universe::_throw_no_such_method_error_cache = new LatestMethodCache();
807 Universe::_do_stack_walk_cache = new LatestMethodCache();
808 Universe::_is_substitutable_cache = new LatestMethodCache();
809 Universe::_value_object_hash_code_cache = new LatestMethodCache();
810
811 #if INCLUDE_CDS
812 DynamicArchive::check_for_dynamic_dump();
813 if (UseSharedSpaces) {
814 // Read the data structures supporting the shared spaces (shared
815 // system dictionary, symbol table, etc.). After that, access to
816 // the file (other than the mapped regions) is no longer needed, and
817 // the file is closed. Closing the file does not affect the
818 // currently mapped regions.
819 MetaspaceShared::initialize_shared_spaces();
820 StringTable::create_table();
821 if (ArchiveHeapLoader::is_loaded()) {
822 StringTable::transfer_shared_strings_to_local_table();
823 }
824 } else
825 #endif
826 {
827 SymbolTable::create_table();
828 StringTable::create_table();
829 }
830
831 #if INCLUDE_CDS
832 if (Arguments::is_dumping_archive()) {
833 MetaspaceShared::prepare_for_dumping();
834 }
835 #endif
836
837 if (strlen(VerifySubSet) > 0) {
838 Universe::initialize_verify_flags();
839 }
840
841 ResolvedMethodTable::create_table();
842
843 return JNI_OK;
844 }
845
846 jint Universe::initialize_heap() {
847 assert(_collectedHeap == NULL, "Heap already created");
848 _collectedHeap = GCConfig::arguments()->create_heap();
849
850 log_info(gc)("Using %s", _collectedHeap->name());
851 return _collectedHeap->initialize();
852 }
853
854 void Universe::initialize_tlab() {
855 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
856 PLAB::startup_initialization();
857 if (UseTLAB) {
858 ThreadLocalAllocBuffer::startup_initialization();
859 }
860 }
861
862 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
863
864 assert(alignment <= Arguments::conservative_max_heap_alignment(),
865 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
866 alignment, Arguments::conservative_max_heap_alignment());
867
868 size_t total_reserved = align_up(heap_size, alignment);
869 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
870 "heap size is too big for compressed oops");
871
872 size_t page_size = os::vm_page_size();
873 if (UseLargePages && is_aligned(alignment, os::large_page_size())) {
874 page_size = os::large_page_size();
875 } else {
876 // Parallel is the only collector that might opt out of using large pages
877 // for the heap.
878 assert(!UseLargePages || UseParallelGC , "Wrong alignment to use large pages");
879 }
880
881 // Now create the space.
882 ReservedHeapSpace total_rs(total_reserved, alignment, page_size, AllocateHeapAt);
883
884 if (total_rs.is_reserved()) {
885 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
886 "must be exactly of required size and alignment");
887 // We are good.
888
889 if (AllocateHeapAt != NULL) {
890 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
891 }
892
893 if (UseCompressedOops) {
894 CompressedOops::initialize(total_rs);
895 }
896
897 Universe::calculate_verify_data((HeapWord*)total_rs.base(), (HeapWord*)total_rs.end());
898
899 return total_rs;
900 }
901
902 vm_exit_during_initialization(
903 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
904 total_reserved/K));
905
906 // satisfy compiler
907 ShouldNotReachHere();
908 return ReservedHeapSpace(0, 0, os::vm_page_size());
909 }
910
911 OopStorage* Universe::vm_weak() {
912 return Universe::_vm_weak;
913 }
914
915 OopStorage* Universe::vm_global() {
916 return Universe::_vm_global;
917 }
918
919 void Universe::oopstorage_init() {
920 Universe::_vm_global = OopStorageSet::create_strong("VM Global", mtInternal);
921 Universe::_vm_weak = OopStorageSet::create_weak("VM Weak", mtInternal);
922 }
923
924 void universe_oopstorage_init() {
925 Universe::oopstorage_init();
926 }
927
928 void initialize_known_method(LatestMethodCache* method_cache,
929 InstanceKlass* ik,
930 const char* method,
931 Symbol* signature,
932 bool is_static, TRAPS)
933 {
934 TempNewSymbol name = SymbolTable::new_symbol(method);
935 Method* m = NULL;
936 // The klass must be linked before looking up the method.
937 if (!ik->link_class_or_fail(THREAD) ||
938 ((m = ik->find_method(name, signature)) == NULL) ||
939 is_static != m->is_static()) {
940 ResourceMark rm(THREAD);
941 // NoSuchMethodException doesn't actually work because it tries to run the
942 // <init> function before java_lang_Class is linked. Print error and exit.
943 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
944 ik->name()->as_C_string(), method));
945 }
946 method_cache->init(ik, m);
947 }
948
949 void Universe::initialize_known_methods(TRAPS) {
950 // Set up static method for registering finalizers
951 initialize_known_method(_finalizer_register_cache,
952 vmClasses::Finalizer_klass(),
953 "register",
954 vmSymbols::object_void_signature(), true, CHECK);
955
956 initialize_known_method(_throw_illegal_access_error_cache,
957 vmClasses::internal_Unsafe_klass(),
958 "throwIllegalAccessError",
959 vmSymbols::void_method_signature(), true, CHECK);
960
961 initialize_known_method(_throw_no_such_method_error_cache,
962 vmClasses::internal_Unsafe_klass(),
963 "throwNoSuchMethodError",
964 vmSymbols::void_method_signature(), true, CHECK);
965
966 // Set up method for registering loaded classes in class loader vector
967 initialize_known_method(_loader_addClass_cache,
968 vmClasses::ClassLoader_klass(),
969 "addClass",
970 vmSymbols::class_void_signature(), false, CHECK);
971
972 // Set up method for stack walking
973 initialize_known_method(_do_stack_walk_cache,
974 vmClasses::AbstractStackWalker_klass(),
975 "doStackWalk",
976 vmSymbols::doStackWalk_signature(), false, CHECK);
977
978 // Set up substitutability testing
979 ResourceMark rm;
980 initialize_known_method(_is_substitutable_cache,
981 vmClasses::ValueObjectMethods_klass(),
982 vmSymbols::isSubstitutable_name()->as_C_string(),
983 vmSymbols::object_object_boolean_signature(), true, CHECK);
984 initialize_known_method(_value_object_hash_code_cache,
985 vmClasses::ValueObjectMethods_klass(),
986 vmSymbols::valueObjectHashCode_name()->as_C_string(),
987 vmSymbols::object_int_signature(), true, CHECK);
988 }
989
990 void universe2_init() {
991 EXCEPTION_MARK;
992 Universe::genesis(CATCH);
993 }
994
995 // Set after initialization of the module runtime, call_initModuleRuntime
996 void universe_post_module_init() {
997 Universe::_module_initialized = true;
998 }
999
1000 bool universe_post_init() {
1001 assert(!is_init_completed(), "Error: initialization not yet completed!");
1002 Universe::_fully_initialized = true;
1003 EXCEPTION_MARK;
1004 if (!UseSharedSpaces) {
1005 reinitialize_vtables();
1006 reinitialize_itables();
1007 }
1008
1009 HandleMark hm(THREAD);
1010 // Setup preallocated empty java.lang.Class array for Method reflection.
1011
1012 objArrayOop the_empty_class_array = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_false);
1013 Universe::_the_empty_class_array = OopHandle(Universe::vm_global(), the_empty_class_array);
1014
1015 // Setup preallocated OutOfMemoryError errors
1016 Universe::create_preallocated_out_of_memory_errors(CHECK_false);
1017
1018 oop instance;
1019 // Setup preallocated cause message for delayed StackOverflowError
1020 if (StackReservedPages > 0) {
1021 instance = java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
1022 Universe::_delayed_stack_overflow_error_message = OopHandle(Universe::vm_global(), instance);
1023 }
1024
1025 // Setup preallocated NullPointerException
1026 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1027 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
1028 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1029 Universe::_null_ptr_exception_instance = OopHandle(Universe::vm_global(), instance);
1030
1031 // Setup preallocated ArithmeticException
1032 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1033 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
1034 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1035 Universe::_arithmetic_exception_instance = OopHandle(Universe::vm_global(), instance);
1036
1037 // Virtual Machine Error for when we get into a situation we can't resolve
1038 k = vmClasses::VirtualMachineError_klass();
1039 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1040 if (!linked) {
1041 tty->print_cr("Unable to link/verify VirtualMachineError class");
1042 return false; // initialization failed
1043 }
1044 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1045 Universe::_virtual_machine_error_instance = OopHandle(Universe::vm_global(), instance);
1046
1047 Handle msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1048 java_lang_Throwable::set_message(Universe::arithmetic_exception_instance(), msg());
1049
1050 Universe::initialize_known_methods(CHECK_false);
1051
1052 // This needs to be done before the first scavenge/gc, since
1053 // it's an input to soft ref clearing policy.
1054 {
1055 MutexLocker x(THREAD, Heap_lock);
1056 Universe::heap()->update_capacity_and_used_at_gc();
1057 }
1058
1059 // ("weak") refs processing infrastructure initialization
1060 Universe::heap()->post_initialize();
1061
1062 MemoryService::add_metaspace_memory_pools();
1063
1064 MemoryService::set_universe_heap(Universe::heap());
1065 #if INCLUDE_CDS
1066 MetaspaceShared::post_initialize(CHECK_false);
1067 #endif
1068 return true;
1069 }
1070
1071
1072 void Universe::compute_base_vtable_size() {
1073 _base_vtable_size = ClassLoader::compute_Object_vtable();
1074 }
1075
1076 void Universe::print_on(outputStream* st) {
1077 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1078 st->print_cr("Heap");
1079 heap()->print_on(st);
1080 }
1081
1082 void Universe::print_heap_at_SIGBREAK() {
1083 if (PrintHeapAtSIGBREAK) {
1084 print_on(tty);
1085 tty->cr();
1086 tty->flush();
1087 }
1088 }
1089
1090 void Universe::initialize_verify_flags() {
1091 verify_flags = 0;
1092 const char delimiter[] = " ,";
1093
1094 size_t length = strlen(VerifySubSet);
1095 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1096 strncpy(subset_list, VerifySubSet, length + 1);
1097 char* save_ptr;
1098
1099 char* token = strtok_r(subset_list, delimiter, &save_ptr);
1100 while (token != NULL) {
1101 if (strcmp(token, "threads") == 0) {
1102 verify_flags |= Verify_Threads;
1103 } else if (strcmp(token, "heap") == 0) {
1104 verify_flags |= Verify_Heap;
1105 } else if (strcmp(token, "symbol_table") == 0) {
1106 verify_flags |= Verify_SymbolTable;
1107 } else if (strcmp(token, "string_table") == 0) {
1108 verify_flags |= Verify_StringTable;
1109 } else if (strcmp(token, "codecache") == 0) {
1110 verify_flags |= Verify_CodeCache;
1111 } else if (strcmp(token, "dictionary") == 0) {
1112 verify_flags |= Verify_SystemDictionary;
1113 } else if (strcmp(token, "classloader_data_graph") == 0) {
1114 verify_flags |= Verify_ClassLoaderDataGraph;
1115 } else if (strcmp(token, "metaspace") == 0) {
1116 verify_flags |= Verify_MetaspaceUtils;
1117 } else if (strcmp(token, "jni_handles") == 0) {
1118 verify_flags |= Verify_JNIHandles;
1119 } else if (strcmp(token, "codecache_oops") == 0) {
1120 verify_flags |= Verify_CodeCacheOops;
1121 } else if (strcmp(token, "resolved_method_table") == 0) {
1122 verify_flags |= Verify_ResolvedMethodTable;
1123 } else if (strcmp(token, "stringdedup") == 0) {
1124 verify_flags |= Verify_StringDedup;
1125 } else {
1126 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1127 }
1128 token = strtok_r(NULL, delimiter, &save_ptr);
1129 }
1130 FREE_C_HEAP_ARRAY(char, subset_list);
1131 }
1132
1133 bool Universe::should_verify_subset(uint subset) {
1134 if (verify_flags & subset) {
1135 return true;
1136 }
1137 return false;
1138 }
1139
1140 void Universe::verify(VerifyOption option, const char* prefix) {
1141 COMPILER2_PRESENT(
1142 assert(!DerivedPointerTable::is_active(),
1143 "DPT should not be active during verification "
1144 "(of thread stacks below)");
1145 )
1146
1147 Thread* thread = Thread::current();
1148 ResourceMark rm(thread);
1149 HandleMark hm(thread); // Handles created during verification can be zapped
1150 _verify_count++;
1151
1152 FormatBuffer<> title("Verifying %s", prefix);
1153 GCTraceTime(Info, gc, verify) tm(title.buffer());
1154 if (should_verify_subset(Verify_Threads)) {
1155 log_debug(gc, verify)("Threads");
1156 Threads::verify();
1157 }
1158 if (should_verify_subset(Verify_Heap)) {
1159 log_debug(gc, verify)("Heap");
1160 heap()->verify(option);
1161 }
1162 if (should_verify_subset(Verify_SymbolTable)) {
1163 log_debug(gc, verify)("SymbolTable");
1164 SymbolTable::verify();
1165 }
1166 if (should_verify_subset(Verify_StringTable)) {
1167 log_debug(gc, verify)("StringTable");
1168 StringTable::verify();
1169 }
1170 if (should_verify_subset(Verify_CodeCache)) {
1171 log_debug(gc, verify)("CodeCache");
1172 CodeCache::verify();
1173 }
1174 if (should_verify_subset(Verify_SystemDictionary)) {
1175 log_debug(gc, verify)("SystemDictionary");
1176 SystemDictionary::verify();
1177 }
1178 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1179 log_debug(gc, verify)("ClassLoaderDataGraph");
1180 ClassLoaderDataGraph::verify();
1181 }
1182 if (should_verify_subset(Verify_MetaspaceUtils)) {
1183 log_debug(gc, verify)("MetaspaceUtils");
1184 DEBUG_ONLY(MetaspaceUtils::verify();)
1185 }
1186 if (should_verify_subset(Verify_JNIHandles)) {
1187 log_debug(gc, verify)("JNIHandles");
1188 JNIHandles::verify();
1189 }
1190 if (should_verify_subset(Verify_CodeCacheOops)) {
1191 log_debug(gc, verify)("CodeCache Oops");
1192 CodeCache::verify_oops();
1193 }
1194 if (should_verify_subset(Verify_ResolvedMethodTable)) {
1195 log_debug(gc, verify)("ResolvedMethodTable Oops");
1196 ResolvedMethodTable::verify();
1197 }
1198 if (should_verify_subset(Verify_StringDedup)) {
1199 log_debug(gc, verify)("String Deduplication");
1200 StringDedup::verify();
1201 }
1202 }
1203
1204
1205 #ifndef PRODUCT
1206 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1207 assert(low_boundary < high_boundary, "bad interval");
1208
1209 // decide which low-order bits we require to be clear:
1210 size_t alignSize = MinObjAlignmentInBytes;
1211 size_t min_object_size = CollectedHeap::min_fill_size();
1212
1213 // make an inclusive limit:
1214 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1215 uintptr_t min = (uintptr_t)low_boundary;
1216 assert(min < max, "bad interval");
1217 uintptr_t diff = max ^ min;
1218
1219 // throw away enough low-order bits to make the diff vanish
1220 uintptr_t mask = (uintptr_t)(-1);
1221 while ((mask & diff) != 0)
1222 mask <<= 1;
1223 uintptr_t bits = (min & mask);
1224 assert(bits == (max & mask), "correct mask");
1225 // check an intermediate value between min and max, just to make sure:
1226 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1227
1228 // require address alignment, too:
1229 mask |= (alignSize - 1);
1230
1231 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1232 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1233 }
1234 _verify_oop_mask = mask;
1235 _verify_oop_bits = bits;
1236 }
1237
1238 // Oop verification (see MacroAssembler::verify_oop)
1239
1240 uintptr_t Universe::verify_oop_mask() {
1241 return _verify_oop_mask;
1242 }
1243
1244 uintptr_t Universe::verify_oop_bits() {
1245 return _verify_oop_bits;
1246 }
1247
1248 uintptr_t Universe::verify_mark_mask() {
1249 return markWord::lock_mask_in_place;
1250 }
1251
1252 uintptr_t Universe::verify_mark_bits() {
1253 intptr_t mask = verify_mark_mask();
1254 intptr_t bits = (intptr_t)markWord::prototype().value();
1255 assert((bits & ~mask) == 0, "no stray header bits");
1256 return bits;
1257 }
1258 #endif // PRODUCT
1259
1260
1261 void LatestMethodCache::init(Klass* k, Method* m) {
1262 if (!UseSharedSpaces) {
1263 _klass = k;
1264 }
1265 #ifndef PRODUCT
1266 else {
1267 // sharing initialization should have already set up _klass
1268 assert(_klass != NULL, "just checking");
1269 }
1270 #endif
1271
1272 _method_idnum = m->method_idnum();
1273 assert(_method_idnum >= 0, "sanity check");
1274 }
1275
1276
1277 Method* LatestMethodCache::get_method() {
1278 if (klass() == NULL) return NULL;
1279 InstanceKlass* ik = InstanceKlass::cast(klass());
1280 Method* m = ik->method_with_idnum(method_idnum());
1281 assert(m != NULL, "sanity check");
1282 return m;
1283 }
1284
1285 #ifdef ASSERT
1286 // Release dummy object(s) at bottom of heap
1287 bool Universe::release_fullgc_alot_dummy() {
1288 MutexLocker ml(FullGCALot_lock);
1289 objArrayOop fullgc_alot_dummy_array = (objArrayOop)_fullgc_alot_dummy_array.resolve();
1290 if (fullgc_alot_dummy_array != NULL) {
1291 if (_fullgc_alot_dummy_next >= fullgc_alot_dummy_array->length()) {
1292 // No more dummies to release, release entire array instead
1293 _fullgc_alot_dummy_array.release(Universe::vm_global());
1294 _fullgc_alot_dummy_array = OopHandle(); // NULL out OopStorage pointer.
1295 return false;
1296 }
1297
1298 // Release dummy at bottom of old generation
1299 fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1300 }
1301 return true;
1302 }
1303
1304 bool Universe::is_gc_active() {
1305 return heap()->is_gc_active();
1306 }
1307
1308 bool Universe::is_in_heap(const void* p) {
1309 return heap()->is_in(p);
1310 }
1311
1312 #endif // ASSERT