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