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