1 /*
2 * Copyright (c) 1997, 2020, 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 "aot/aotLoader.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/classLoaderDataGraph.hpp"
29 #include "classfile/javaClasses.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/symbolTable.hpp"
32 #include "classfile/systemDictionary.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "code/codeBehaviours.hpp"
35 #include "code/codeCache.hpp"
36 #include "code/dependencies.hpp"
37 #include "gc/shared/collectedHeap.inline.hpp"
38 #include "gc/shared/gcArguments.hpp"
39 #include "gc/shared/gcConfig.hpp"
40 #include "gc/shared/gcLogPrecious.hpp"
41 #include "gc/shared/gcTraceTime.inline.hpp"
42 #include "gc/shared/oopStorageSet.hpp"
43 #include "interpreter/interpreter.hpp"
44 #include "logging/log.hpp"
45 #include "logging/logStream.hpp"
46 #include "memory/heapShared.hpp"
47 #include "memory/filemap.hpp"
48 #include "memory/metadataFactory.hpp"
49 #include "memory/metaspaceClosure.hpp"
50 #include "memory/metaspaceCounters.hpp"
51 #include "memory/metaspaceShared.hpp"
52 #include "memory/oopFactory.hpp"
53 #include "memory/resourceArea.hpp"
54 #include "memory/universe.hpp"
55 #include "oops/compressedOops.hpp"
56 #include "oops/constantPool.hpp"
57 #include "oops/instanceClassLoaderKlass.hpp"
58 #include "oops/instanceKlass.hpp"
59 #include "oops/instanceMirrorKlass.hpp"
60 #include "oops/instanceRefKlass.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/deoptimization.hpp"
69 #include "runtime/flags/jvmFlagConstraintList.hpp"
70 #include "runtime/handles.inline.hpp"
71 #include "runtime/init.hpp"
72 #include "runtime/java.hpp"
73 #include "runtime/javaCalls.hpp"
74 #include "runtime/sharedRuntime.hpp"
75 #include "runtime/synchronizer.hpp"
76 #include "runtime/thread.inline.hpp"
77 #include "runtime/timerTrace.hpp"
78 #include "runtime/vmOperations.hpp"
79 #include "services/memoryService.hpp"
80 #include "utilities/align.hpp"
81 #include "utilities/autoRestore.hpp"
82 #include "utilities/copy.hpp"
83 #include "utilities/debug.hpp"
84 #include "utilities/events.hpp"
85 #include "utilities/formatBuffer.hpp"
86 #include "utilities/hashtable.inline.hpp"
87 #include "utilities/macros.hpp"
88 #include "utilities/ostream.hpp"
89 #include "utilities/preserveException.hpp"
90
91 #define PRIMITIVE_MIRRORS_DO(func) \
92 func(_int_mirror) \
93 func(_float_mirror) \
94 func(_double_mirror) \
95 func(_byte_mirror) \
96 func(_bool_mirror) \
97 func(_char_mirror) \
98 func(_long_mirror) \
99 func(_short_mirror) \
100 func(_void_mirror)
101
102 #define DEFINE_PRIMITIVE_MIRROR(m) \
103 oop Universe::m = NULL;
104
105 // Known objects
106 PRIMITIVE_MIRRORS_DO(DEFINE_PRIMITIVE_MIRROR)
107 Klass* Universe::_typeArrayKlassObjs[T_LONG+1] = { NULL /*, NULL...*/ };
108 Klass* Universe::_objectArrayKlassObj = NULL;
109 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ };
110
111 OopHandle Universe::_main_thread_group;
112 OopHandle Universe::_system_thread_group;
113 OopHandle Universe::_the_empty_class_array;
114 OopHandle Universe::_the_null_string;
115 OopHandle Universe::_the_min_jint_string;
116
117 OopHandle Universe::_the_null_sentinel;
118
119 // _out_of_memory_errors is an objArray
120 enum OutOfMemoryInstance { _oom_java_heap,
121 _oom_metaspace,
122 _oom_class_metaspace,
123 _oom_array_size,
124 _oom_gc_overhead_limit,
125 _oom_realloc_objects,
126 _oom_retry,
127 _oom_count };
128
129 OopHandle Universe::_out_of_memory_errors;
130 OopHandle Universe::_delayed_stack_overflow_error_message;
131 OopHandle Universe::_preallocated_out_of_memory_error_array;
132 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
133
134 OopHandle Universe::_null_ptr_exception_instance;
135 OopHandle Universe::_arithmetic_exception_instance;
136 OopHandle Universe::_virtual_machine_error_instance;
137
138 oop Universe::_reference_pending_list = NULL;
139
140 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
141 LatestMethodCache* Universe::_finalizer_register_cache = NULL;
142 LatestMethodCache* Universe::_loader_addClass_cache = NULL;
143 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL;
144 LatestMethodCache* Universe::_throw_no_such_method_error_cache = NULL;
145 LatestMethodCache* Universe::_do_stack_walk_cache = NULL;
146
147 bool Universe::_verify_in_progress = false;
148 long Universe::verify_flags = Universe::Verify_All;
149
150 Array<int>* Universe::_the_empty_int_array = NULL;
151 Array<u2>* Universe::_the_empty_short_array = NULL;
152 Array<Klass*>* Universe::_the_empty_klass_array = NULL;
153 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = NULL;
154 Array<Method*>* Universe::_the_empty_method_array = NULL;
155
156 // These variables are guarded by FullGCALot_lock.
157 debug_only(OopHandle Universe::_fullgc_alot_dummy_array;)
158 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
159
160 // Heap
161 int Universe::_verify_count = 0;
162
163 // Oop verification (see MacroAssembler::verify_oop)
164 uintptr_t Universe::_verify_oop_mask = 0;
165 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
166
167 int Universe::_base_vtable_size = 0;
168 bool Universe::_bootstrapping = false;
169 bool Universe::_module_initialized = false;
170 bool Universe::_fully_initialized = false;
171
172 size_t Universe::_heap_capacity_at_last_gc;
173 size_t Universe::_heap_used_at_last_gc = 0;
174
175 OopStorage* Universe::_vm_weak = NULL;
176 OopStorage* Universe::_vm_global = NULL;
177
178 CollectedHeap* Universe::_collectedHeap = NULL;
179
180 objArrayOop Universe::the_empty_class_array () {
181 return (objArrayOop)_the_empty_class_array.resolve();
182 }
183
184 oop Universe::main_thread_group() { return _main_thread_group.resolve(); }
185 void Universe::set_main_thread_group(oop group) { _main_thread_group = OopHandle(vm_global(), group); }
186
187 oop Universe::system_thread_group() { return _system_thread_group.resolve(); }
188 void Universe::set_system_thread_group(oop group) { _system_thread_group = OopHandle(vm_global(), group); }
189
190 oop Universe::the_null_string() { return _the_null_string.resolve(); }
191 oop Universe::the_min_jint_string() { return _the_min_jint_string.resolve(); }
192
193 oop Universe::null_ptr_exception_instance() { return _null_ptr_exception_instance.resolve(); }
194 oop Universe::arithmetic_exception_instance() { return _arithmetic_exception_instance.resolve(); }
195 oop Universe::virtual_machine_error_instance() { return _virtual_machine_error_instance.resolve(); }
196
197 oop Universe::the_null_sentinel() { return _the_null_sentinel.resolve(); }
198
199 void Universe::basic_type_classes_do(void f(Klass*)) {
200 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
201 f(_typeArrayKlassObjs[i]);
202 }
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 }
210
211 #define DO_PRIMITIVE_MIRROR(m) \
212 f->do_oop((oop*) &m);
213
214 void Universe::oops_do(OopClosure* f) {
215 PRIMITIVE_MIRRORS_DO(DO_PRIMITIVE_MIRROR);
216
217 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
218 f->do_oop(&_mirrors[i]);
219 }
220 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
221
222 f->do_oop(&_reference_pending_list);
223 ThreadsSMRSupport::exiting_threads_oops_do(f);
224 }
225
226 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
227 it->push(&_klass);
228 }
229
230 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
231 for (int i = 0; i < T_LONG+1; i++) {
232 it->push(&_typeArrayKlassObjs[i]);
233 }
234 it->push(&_objectArrayKlassObj);
235
236 it->push(&_the_empty_int_array);
237 it->push(&_the_empty_short_array);
238 it->push(&_the_empty_klass_array);
239 it->push(&_the_empty_instance_klass_array);
240 it->push(&_the_empty_method_array);
241 it->push(&_the_array_interfaces_array);
242
243 _finalizer_register_cache->metaspace_pointers_do(it);
244 _loader_addClass_cache->metaspace_pointers_do(it);
245 _throw_illegal_access_error_cache->metaspace_pointers_do(it);
246 _throw_no_such_method_error_cache->metaspace_pointers_do(it);
247 _do_stack_walk_cache->metaspace_pointers_do(it);
248 }
249
250 #define ASSERT_MIRROR_NULL(m) \
251 assert(m == NULL, "archived mirrors should be NULL");
252
253 #define SERIALIZE_MIRROR(m) \
254 f->do_oop(&m); \
255 if (m != NULL) { java_lang_Class::update_archived_primitive_mirror_native_pointers(m); }
256
257 // Serialize metadata and pointers to primitive type mirrors in and out of CDS archive
258 void Universe::serialize(SerializeClosure* f) {
259
260 for (int i = 0; i < T_LONG+1; i++) {
261 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
262 }
263
264 f->do_ptr((void**)&_objectArrayKlassObj);
265
266 #if INCLUDE_CDS_JAVA_HEAP
267 DEBUG_ONLY(if (DumpSharedSpaces && !HeapShared::is_heap_object_archiving_allowed()) {
268 PRIMITIVE_MIRRORS_DO(ASSERT_MIRROR_NULL);
269 });
270 PRIMITIVE_MIRRORS_DO(SERIALIZE_MIRROR);
271 #endif
272
273 f->do_ptr((void**)&_the_array_interfaces_array);
274 f->do_ptr((void**)&_the_empty_int_array);
275 f->do_ptr((void**)&_the_empty_short_array);
276 f->do_ptr((void**)&_the_empty_method_array);
277 f->do_ptr((void**)&_the_empty_klass_array);
278 f->do_ptr((void**)&_the_empty_instance_klass_array);
279 _finalizer_register_cache->serialize(f);
280 _loader_addClass_cache->serialize(f);
281 _throw_illegal_access_error_cache->serialize(f);
282 _throw_no_such_method_error_cache->serialize(f);
283 _do_stack_walk_cache->serialize(f);
284 }
285
286 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
287 if (size < alignment || size % alignment != 0) {
288 vm_exit_during_initialization(
289 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
290 }
291 }
292
293 void initialize_basic_type_klass(Klass* k, TRAPS) {
294 Klass* ok = SystemDictionary::Object_klass();
295 #if INCLUDE_CDS
296 if (UseSharedSpaces) {
297 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
298 assert(k->super() == ok, "u3");
299 if (k->is_instance_klass()) {
300 InstanceKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), NULL, CHECK);
301 } else {
302 ArrayKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), CHECK);
303 }
304 } else
305 #endif
306 {
307 k->initialize_supers(ok, NULL, CHECK);
308 }
309 k->append_to_sibling_list();
310 }
311
312 void Universe::genesis(TRAPS) {
313 ResourceMark rm(THREAD);
314
315 { AutoModifyRestore<bool> temporarily(_bootstrapping, true);
316
317 { MutexLocker mc(THREAD, Compile_lock);
318
319 java_lang_Class::allocate_fixup_lists();
320
321 // determine base vtable size; without that we cannot create the array klasses
322 compute_base_vtable_size();
323
324 if (!UseSharedSpaces) {
325 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
326 _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK);
327 }
328
329 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
330
331 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
332 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
333 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
334 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
335 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
336 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK);
337 }
338 }
339
340 vmSymbols::initialize(CHECK);
341
342 SystemDictionary::initialize(CHECK);
343
344 // Create string constants
345 oop s = StringTable::intern("null", CHECK);
346 _the_null_string = OopHandle(vm_global(), s);
347 s = StringTable::intern("-2147483648", CHECK);
348 _the_min_jint_string = OopHandle(vm_global(), s);
349
350
351 #if INCLUDE_CDS
352 if (UseSharedSpaces) {
353 // Verify shared interfaces array.
354 assert(_the_array_interfaces_array->at(0) ==
355 SystemDictionary::Cloneable_klass(), "u3");
356 assert(_the_array_interfaces_array->at(1) ==
357 SystemDictionary::Serializable_klass(), "u3");
358 } else
359 #endif
360 {
361 // Set up shared interfaces array. (Do this before supers are set up.)
362 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
363 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
364 }
365
366 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
367 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
368 initialize_basic_type_klass(floatArrayKlassObj(), CHECK);
369 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
370 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
371 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
372 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
373 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
374 } // end of core bootstrapping
375
376 {
377 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
378 _the_null_sentinel = OopHandle(vm_global(), tns());
379 }
380
381 // Maybe this could be lifted up now that object array can be initialized
382 // during the bootstrapping.
383
384 // OLD
385 // Initialize _objectArrayKlass after core bootstraping to make
386 // sure the super class is set up properly for _objectArrayKlass.
387 // ---
388 // NEW
389 // Since some of the old system object arrays have been converted to
390 // ordinary object arrays, _objectArrayKlass will be loaded when
391 // SystemDictionary::initialize(CHECK); is run. See the extra check
392 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
393 _objectArrayKlassObj = InstanceKlass::
394 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
395 // OLD
396 // Add the class to the class hierarchy manually to make sure that
397 // its vtable is initialized after core bootstrapping is completed.
398 // ---
399 // New
400 // Have already been initialized.
401 _objectArrayKlassObj->append_to_sibling_list();
402
403 #ifdef ASSERT
404 if (FullGCALot) {
405 // Allocate an array of dummy objects.
406 // We'd like these to be at the bottom of the old generation,
407 // so that when we free one and then collect,
408 // (almost) the whole heap moves
409 // and we find out if we actually update all the oops correctly.
410 // But we can't allocate directly in the old generation,
411 // so we allocate wherever, and hope that the first collection
412 // moves these objects to the bottom of the old generation.
413 int size = FullGCALotDummies * 2;
414
415 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
416 objArrayHandle dummy_array(THREAD, naked_array);
417 int i = 0;
418 while (i < size) {
419 // Allocate dummy in old generation
420 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK);
421 dummy_array->obj_at_put(i++, dummy);
422 }
423 {
424 // Only modify the global variable inside the mutex.
425 // If we had a race to here, the other dummy_array instances
426 // and their elements just get dropped on the floor, which is fine.
427 MutexLocker ml(THREAD, FullGCALot_lock);
428 if (_fullgc_alot_dummy_array.is_empty()) {
429 _fullgc_alot_dummy_array = OopHandle(vm_global(), dummy_array());
430 }
431 }
432 assert(i == ((objArrayOop)_fullgc_alot_dummy_array.resolve())->length(), "just checking");
433 }
434 #endif
435 }
436
437 #define ASSERT_MIRROR_NOT_NULL(m) \
438 assert(m != NULL, "archived mirrors should not be NULL");
439
440 void Universe::initialize_basic_type_mirrors(TRAPS) {
441 #if INCLUDE_CDS_JAVA_HEAP
442 if (UseSharedSpaces &&
443 HeapShared::open_archive_heap_region_mapped() &&
444 _int_mirror != NULL) {
445 assert(HeapShared::is_heap_object_archiving_allowed(), "Sanity");
446 PRIMITIVE_MIRRORS_DO(ASSERT_MIRROR_NOT_NULL);
447 } else
448 // _int_mirror could be NULL if archived heap is not mapped.
449 #endif
450 {
451 _int_mirror =
452 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK);
453 _float_mirror =
454 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK);
455 _double_mirror =
456 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK);
457 _byte_mirror =
458 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK);
459 _bool_mirror =
460 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
461 _char_mirror =
462 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK);
463 _long_mirror =
464 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK);
465 _short_mirror =
466 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK);
467 _void_mirror =
468 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK);
469 }
470
471 _mirrors[T_INT] = _int_mirror;
472 _mirrors[T_FLOAT] = _float_mirror;
473 _mirrors[T_DOUBLE] = _double_mirror;
474 _mirrors[T_BYTE] = _byte_mirror;
475 _mirrors[T_BOOLEAN] = _bool_mirror;
476 _mirrors[T_CHAR] = _char_mirror;
477 _mirrors[T_LONG] = _long_mirror;
478 _mirrors[T_SHORT] = _short_mirror;
479 _mirrors[T_VOID] = _void_mirror;
480 //_mirrors[T_OBJECT] = _object_klass->java_mirror();
481 //_mirrors[T_ARRAY] = _object_klass->java_mirror();
482 }
483
484 void Universe::fixup_mirrors(TRAPS) {
485 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
486 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
487 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
488 // that the number of objects allocated at this point is very small.
489 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
490 HandleMark hm(THREAD);
491
492 if (!UseSharedSpaces) {
493 // Cache the start of the static fields
494 InstanceMirrorKlass::init_offset_of_static_fields();
495 }
496
497 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
498 int list_length = list->length();
499 for (int i = 0; i < list_length; i++) {
500 Klass* k = list->at(i);
501 assert(k->is_klass(), "List should only hold classes");
502 EXCEPTION_MARK;
503 java_lang_Class::fixup_mirror(k, CATCH);
504 }
505 delete java_lang_Class::fixup_mirror_list();
506 java_lang_Class::set_fixup_mirror_list(NULL);
507 }
508
509 #define assert_pll_locked(test) \
510 assert(Heap_lock->test(), "Reference pending list access requires lock")
511
512 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
513
514 oop Universe::reference_pending_list() {
515 if (Thread::current()->is_VM_thread()) {
516 assert_pll_locked(is_locked);
517 } else {
518 assert_pll_ownership();
519 }
520 return _reference_pending_list;
521 }
522
523 void Universe::clear_reference_pending_list() {
524 assert_pll_ownership();
525 _reference_pending_list = NULL;
526 }
527
528 bool Universe::has_reference_pending_list() {
529 assert_pll_ownership();
530 return _reference_pending_list != NULL;
531 }
532
533 oop Universe::swap_reference_pending_list(oop list) {
534 assert_pll_locked(is_locked);
535 return Atomic::xchg(&_reference_pending_list, list);
536 }
537
538 #undef assert_pll_locked
539 #undef assert_pll_ownership
540
541 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) {
542 // init vtable of k and all subclasses
543 ko->vtable().initialize_vtable(false, CHECK);
544 if (ko->is_instance_klass()) {
545 for (Klass* sk = ko->subklass();
546 sk != NULL;
547 sk = sk->next_sibling()) {
548 reinitialize_vtable_of(sk, CHECK);
549 }
550 }
551 }
552
553 void Universe::reinitialize_vtables(TRAPS) {
554 // The vtables are initialized by starting at java.lang.Object and
555 // initializing through the subclass links, so that the super
556 // classes are always initialized first.
557 Klass* ok = SystemDictionary::Object_klass();
558 Universe::reinitialize_vtable_of(ok, THREAD);
559 }
560
561
562 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) {
563 k->itable().initialize_itable(false, CHECK);
564 }
565
566
567 void Universe::reinitialize_itables(TRAPS) {
568 MutexLocker mcld(THREAD, ClassLoaderDataGraph_lock);
569 ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK);
570 }
571
572
573 bool Universe::on_page_boundary(void* addr) {
574 return is_aligned(addr, os::vm_page_size());
575 }
576
577 // the array of preallocated errors with backtraces
578 objArrayOop Universe::preallocated_out_of_memory_errors() {
579 return (objArrayOop)_preallocated_out_of_memory_error_array.resolve();
580 }
581
582 objArrayOop Universe::out_of_memory_errors() { return (objArrayOop)_out_of_memory_errors.resolve(); }
583
584 oop Universe::out_of_memory_error_java_heap() {
585 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_java_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 SystemDictionary::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 Thread* THREAD = Thread::current();
650 Handle default_err_h(THREAD, 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(THREAD, 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 // Setup preallocated OutOfMemoryError errors
669 void Universe::create_preallocated_out_of_memory_errors(TRAPS) {
670 InstanceKlass* ik = SystemDictionary::OutOfMemoryError_klass();
671 objArrayOop oa = oopFactory::new_objArray(ik, _oom_count, CHECK);
672 objArrayHandle oom_array(THREAD, oa);
673
674 for (int i = 0; i < _oom_count; i++) {
675 oop oom_obj = ik->allocate_instance(CHECK);
676 oom_array->obj_at_put(i, oom_obj);
677 }
678 _out_of_memory_errors = OopHandle(vm_global(), oom_array());
679
680 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK);
681 java_lang_Throwable::set_message(oom_array->obj_at(_oom_java_heap), msg());
682
683 msg = java_lang_String::create_from_str("Metaspace", CHECK);
684 java_lang_Throwable::set_message(oom_array->obj_at(_oom_metaspace), msg());
685
686 msg = java_lang_String::create_from_str("Compressed class space", CHECK);
687 java_lang_Throwable::set_message(oom_array->obj_at(_oom_class_metaspace), msg());
688
689 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK);
690 java_lang_Throwable::set_message(oom_array->obj_at(_oom_array_size), msg());
691
692 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK);
693 java_lang_Throwable::set_message(oom_array->obj_at(_oom_gc_overhead_limit), msg());
694
695 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK);
696 java_lang_Throwable::set_message(oom_array->obj_at(_oom_realloc_objects), msg());
697
698 msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK);
699 java_lang_Throwable::set_message(oom_array->obj_at(_oom_retry), msg());
700
701 // Setup the array of errors that have preallocated backtrace
702 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
703 objArrayOop instance = oopFactory::new_objArray(ik, len, CHECK);
704 _preallocated_out_of_memory_error_array = OopHandle(vm_global(), instance);
705 objArrayHandle preallocated_oom_array(THREAD, instance);
706
707 for (int i=0; i<len; i++) {
708 oop err = ik->allocate_instance(CHECK);
709 Handle err_h(THREAD, err);
710 java_lang_Throwable::allocate_backtrace(err_h, CHECK);
711 preallocated_oom_array->obj_at_put(i, err_h());
712 }
713 _preallocated_out_of_memory_error_avail_count = (jint)len;
714 }
715
716 intptr_t Universe::_non_oop_bits = 0;
717
718 void* Universe::non_oop_word() {
719 // Neither the high bits nor the low bits of this value is allowed
720 // to look like (respectively) the high or low bits of a real oop.
721 //
722 // High and low are CPU-specific notions, but low always includes
723 // the low-order bit. Since oops are always aligned at least mod 4,
724 // setting the low-order bit will ensure that the low half of the
725 // word will never look like that of a real oop.
726 //
727 // Using the OS-supplied non-memory-address word (usually 0 or -1)
728 // will take care of the high bits, however many there are.
729
730 if (_non_oop_bits == 0) {
731 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
732 }
733
734 return (void*)_non_oop_bits;
735 }
736
737 static void initialize_global_behaviours() {
738 CompiledICProtectionBehaviour::set_current(new DefaultICProtectionBehaviour());
739 }
740
741 jint universe_init() {
742 assert(!Universe::_fully_initialized, "called after initialize_vtables");
743 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
744 "LogHeapWordSize is incorrect.");
745 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
746 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
747 "oop size is not not a multiple of HeapWord size");
748
749 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
750
751 initialize_global_behaviours();
752
753 GCLogPrecious::initialize();
754
755 GCConfig::arguments()->initialize_heap_sizes();
756
757 jint status = Universe::initialize_heap();
758 if (status != JNI_OK) {
759 return status;
760 }
761
762 Universe::initialize_tlab();
763
764 Metaspace::global_initialize();
765
766 // Initialize performance counters for metaspaces
767 MetaspaceCounters::initialize_performance_counters();
768 CompressedClassSpaceCounters::initialize_performance_counters();
769
770 AOTLoader::universe_init();
771
772 // Checks 'AfterMemoryInit' constraints.
773 if (!JVMFlagConstraintList::check_constraints(JVMFlagConstraint::AfterMemoryInit)) {
774 return JNI_EINVAL;
775 }
776
777 // Create memory for metadata. Must be after initializing heap for
778 // DumpSharedSpaces.
779 ClassLoaderData::init_null_class_loader_data();
780
781 // We have a heap so create the Method* caches before
782 // Metaspace::initialize_shared_spaces() tries to populate them.
783 Universe::_finalizer_register_cache = new LatestMethodCache();
784 Universe::_loader_addClass_cache = new LatestMethodCache();
785 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
786 Universe::_throw_no_such_method_error_cache = new LatestMethodCache();
787 Universe::_do_stack_walk_cache = new LatestMethodCache();
788
789 #if INCLUDE_CDS
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 } else
799 #endif
800 {
801 SymbolTable::create_table();
802 StringTable::create_table();
803 }
804
805 #if INCLUDE_CDS
806 if (Arguments::is_dumping_archive()) {
807 MetaspaceShared::prepare_for_dumping();
808 }
809 #endif
810
811 if (strlen(VerifySubSet) > 0) {
812 Universe::initialize_verify_flags();
813 }
814
815 ResolvedMethodTable::create_table();
816
817 return JNI_OK;
818 }
819
820 jint Universe::initialize_heap() {
821 assert(_collectedHeap == NULL, "Heap already created");
822 _collectedHeap = GCConfig::arguments()->create_heap();
823
824 log_info(gc)("Using %s", _collectedHeap->name());
825 return _collectedHeap->initialize();
826 }
827
828 void Universe::initialize_tlab() {
829 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
830 if (UseTLAB) {
831 assert(Universe::heap()->supports_tlab_allocation(),
832 "Should support thread-local allocation buffers");
833 ThreadLocalAllocBuffer::startup_initialization();
834 }
835 }
836
837 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
838
839 assert(alignment <= Arguments::conservative_max_heap_alignment(),
840 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
841 alignment, Arguments::conservative_max_heap_alignment());
842
843 size_t total_reserved = align_up(heap_size, alignment);
844 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
845 "heap size is too big for compressed oops");
846
847 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size());
848 assert(!UseLargePages
849 || UseParallelGC
850 || use_large_pages, "Wrong alignment to use large pages");
851
852 // Now create the space.
853 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt);
854
855 if (total_rs.is_reserved()) {
856 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
857 "must be exactly of required size and alignment");
858 // We are good.
859
860 if (AllocateHeapAt != NULL) {
861 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
862 }
863
864 if (UseCompressedOops) {
865 CompressedOops::initialize(total_rs);
866 }
867
868 Universe::calculate_verify_data((HeapWord*)total_rs.base(), (HeapWord*)total_rs.end());
869
870 return total_rs;
871 }
872
873 vm_exit_during_initialization(
874 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
875 total_reserved/K));
876
877 // satisfy compiler
878 ShouldNotReachHere();
879 return ReservedHeapSpace(0, 0, false);
880 }
881
882
883 // It's the caller's responsibility to ensure glitch-freedom
884 // (if required).
885 void Universe::update_heap_info_at_gc() {
886 _heap_capacity_at_last_gc = heap()->capacity();
887 _heap_used_at_last_gc = heap()->used();
888 }
889
890 OopStorage* Universe::vm_weak() {
891 return Universe::_vm_weak;
892 }
893
894 OopStorage* Universe::vm_global() {
895 return Universe::_vm_global;
896 }
897
898 void Universe::oopstorage_init() {
899 Universe::_vm_global = OopStorageSet::create_strong("VM Global");
900 Universe::_vm_weak = OopStorageSet::create_weak("VM Weak");
901 }
902
903 void universe_oopstorage_init() {
904 Universe::oopstorage_init();
905 }
906
907 void initialize_known_method(LatestMethodCache* method_cache,
908 InstanceKlass* ik,
909 const char* method,
910 Symbol* signature,
911 bool is_static, TRAPS)
912 {
913 TempNewSymbol name = SymbolTable::new_symbol(method);
914 Method* m = NULL;
915 // The klass must be linked before looking up the method.
916 if (!ik->link_class_or_fail(THREAD) ||
917 ((m = ik->find_method(name, signature)) == NULL) ||
918 is_static != m->is_static()) {
919 ResourceMark rm(THREAD);
920 // NoSuchMethodException doesn't actually work because it tries to run the
921 // <init> function before java_lang_Class is linked. Print error and exit.
922 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
923 ik->name()->as_C_string(), method));
924 }
925 method_cache->init(ik, m);
926 }
927
928 void Universe::initialize_known_methods(TRAPS) {
929 // Set up static method for registering finalizers
930 initialize_known_method(_finalizer_register_cache,
931 SystemDictionary::Finalizer_klass(),
932 "register",
933 vmSymbols::object_void_signature(), true, CHECK);
934
935 initialize_known_method(_throw_illegal_access_error_cache,
936 SystemDictionary::internal_Unsafe_klass(),
937 "throwIllegalAccessError",
938 vmSymbols::void_method_signature(), true, CHECK);
939
940 initialize_known_method(_throw_no_such_method_error_cache,
941 SystemDictionary::internal_Unsafe_klass(),
942 "throwNoSuchMethodError",
943 vmSymbols::void_method_signature(), true, CHECK);
944
945 // Set up method for registering loaded classes in class loader vector
946 initialize_known_method(_loader_addClass_cache,
947 SystemDictionary::ClassLoader_klass(),
948 "addClass",
949 vmSymbols::class_void_signature(), false, CHECK);
950
951 // Set up method for stack walking
952 initialize_known_method(_do_stack_walk_cache,
953 SystemDictionary::AbstractStackWalker_klass(),
954 "doStackWalk",
955 vmSymbols::doStackWalk_signature(), false, CHECK);
956 }
957
958 void universe2_init() {
959 EXCEPTION_MARK;
960 Universe::genesis(CATCH);
961 }
962
963 // Set after initialization of the module runtime, call_initModuleRuntime
964 void universe_post_module_init() {
965 Universe::_module_initialized = true;
966 }
967
968 bool universe_post_init() {
969 assert(!is_init_completed(), "Error: initialization not yet completed!");
970 Universe::_fully_initialized = true;
971 EXCEPTION_MARK;
972 if (!UseSharedSpaces) {
973 ResourceMark rm;
974 Universe::reinitialize_vtables(CHECK_false);
975 Universe::reinitialize_itables(CHECK_false);
976 }
977
978 HandleMark hm(THREAD);
979 // Setup preallocated empty java.lang.Class array for Method reflection.
980
981 objArrayOop the_empty_class_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
982 Universe::_the_empty_class_array = OopHandle(Universe::vm_global(), the_empty_class_array);
983
984 // Setup preallocated OutOfMemoryError errors
985 Universe::create_preallocated_out_of_memory_errors(CHECK_false);
986
987 oop instance;
988 // Setup preallocated cause message for delayed StackOverflowError
989 if (StackReservedPages > 0) {
990 instance = java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
991 Universe::_delayed_stack_overflow_error_message = OopHandle(Universe::vm_global(), instance);
992 }
993
994 // Setup preallocated NullPointerException
995 // (this is currently used for a cheap & dirty solution in compiler exception handling)
996 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
997 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
998 Universe::_null_ptr_exception_instance = OopHandle(Universe::vm_global(), instance);
999
1000 // Setup preallocated ArithmeticException
1001 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1002 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
1003 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1004 Universe::_arithmetic_exception_instance = OopHandle(Universe::vm_global(), instance);
1005
1006 // Virtual Machine Error for when we get into a situation we can't resolve
1007 k = SystemDictionary::VirtualMachineError_klass();
1008 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1009 if (!linked) {
1010 tty->print_cr("Unable to link/verify VirtualMachineError class");
1011 return false; // initialization failed
1012 }
1013 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1014 Universe::_virtual_machine_error_instance = OopHandle(Universe::vm_global(), instance);
1015
1016 Handle msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1017 java_lang_Throwable::set_message(Universe::arithmetic_exception_instance(), msg());
1018
1019
1020 Universe::initialize_known_methods(CHECK_false);
1021
1022 // This needs to be done before the first scavenge/gc, since
1023 // it's an input to soft ref clearing policy.
1024 {
1025 MutexLocker x(THREAD, Heap_lock);
1026 Universe::update_heap_info_at_gc();
1027 }
1028
1029 // ("weak") refs processing infrastructure initialization
1030 Universe::heap()->post_initialize();
1031
1032 MemoryService::add_metaspace_memory_pools();
1033
1034 MemoryService::set_universe_heap(Universe::heap());
1035 #if INCLUDE_CDS
1036 MetaspaceShared::post_initialize(CHECK_false);
1037 #endif
1038 return true;
1039 }
1040
1041
1042 void Universe::compute_base_vtable_size() {
1043 _base_vtable_size = ClassLoader::compute_Object_vtable();
1044 }
1045
1046 void Universe::print_on(outputStream* st) {
1047 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1048 st->print_cr("Heap");
1049 heap()->print_on(st);
1050 }
1051
1052 void Universe::print_heap_at_SIGBREAK() {
1053 if (PrintHeapAtSIGBREAK) {
1054 print_on(tty);
1055 tty->cr();
1056 tty->flush();
1057 }
1058 }
1059
1060 void Universe::print_heap_before_gc() {
1061 LogTarget(Debug, gc, heap) lt;
1062 if (lt.is_enabled()) {
1063 LogStream ls(lt);
1064 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1065 ResourceMark rm;
1066 heap()->print_on(&ls);
1067 }
1068 }
1069
1070 void Universe::print_heap_after_gc() {
1071 LogTarget(Debug, gc, heap) lt;
1072 if (lt.is_enabled()) {
1073 LogStream ls(lt);
1074 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1075 ResourceMark rm;
1076 heap()->print_on(&ls);
1077 }
1078 }
1079
1080 void Universe::initialize_verify_flags() {
1081 verify_flags = 0;
1082 const char delimiter[] = " ,";
1083
1084 size_t length = strlen(VerifySubSet);
1085 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1086 strncpy(subset_list, VerifySubSet, length + 1);
1087 char* save_ptr;
1088
1089 char* token = strtok_r(subset_list, delimiter, &save_ptr);
1090 while (token != NULL) {
1091 if (strcmp(token, "threads") == 0) {
1092 verify_flags |= Verify_Threads;
1093 } else if (strcmp(token, "heap") == 0) {
1094 verify_flags |= Verify_Heap;
1095 } else if (strcmp(token, "symbol_table") == 0) {
1096 verify_flags |= Verify_SymbolTable;
1097 } else if (strcmp(token, "string_table") == 0) {
1098 verify_flags |= Verify_StringTable;
1099 } else if (strcmp(token, "codecache") == 0) {
1100 verify_flags |= Verify_CodeCache;
1101 } else if (strcmp(token, "dictionary") == 0) {
1102 verify_flags |= Verify_SystemDictionary;
1103 } else if (strcmp(token, "classloader_data_graph") == 0) {
1104 verify_flags |= Verify_ClassLoaderDataGraph;
1105 } else if (strcmp(token, "metaspace") == 0) {
1106 verify_flags |= Verify_MetaspaceUtils;
1107 } else if (strcmp(token, "jni_handles") == 0) {
1108 verify_flags |= Verify_JNIHandles;
1109 } else if (strcmp(token, "codecache_oops") == 0) {
1110 verify_flags |= Verify_CodeCacheOops;
1111 } else if (strcmp(token, "resolved_method_table") == 0) {
1112 verify_flags |= Verify_ResolvedMethodTable;
1113 } else {
1114 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1115 }
1116 token = strtok_r(NULL, delimiter, &save_ptr);
1117 }
1118 FREE_C_HEAP_ARRAY(char, subset_list);
1119 }
1120
1121 bool Universe::should_verify_subset(uint subset) {
1122 if (verify_flags & subset) {
1123 return true;
1124 }
1125 return false;
1126 }
1127
1128 void Universe::verify(VerifyOption option, const char* prefix) {
1129 // The use of _verify_in_progress is a temporary work around for
1130 // 6320749. Don't bother with a creating a class to set and clear
1131 // it since it is only used in this method and the control flow is
1132 // straight forward.
1133 _verify_in_progress = true;
1134
1135 COMPILER2_PRESENT(
1136 assert(!DerivedPointerTable::is_active(),
1137 "DPT should not be active during verification "
1138 "(of thread stacks below)");
1139 )
1140
1141 ResourceMark rm;
1142 HandleMark hm; // Handles created during verification can be zapped
1143 _verify_count++;
1144
1145 FormatBuffer<> title("Verifying %s", prefix);
1146 GCTraceTime(Info, gc, verify) tm(title.buffer());
1147 if (should_verify_subset(Verify_Threads)) {
1148 log_debug(gc, verify)("Threads");
1149 Threads::verify();
1150 }
1151 if (should_verify_subset(Verify_Heap)) {
1152 log_debug(gc, verify)("Heap");
1153 heap()->verify(option);
1154 }
1155 if (should_verify_subset(Verify_SymbolTable)) {
1156 log_debug(gc, verify)("SymbolTable");
1157 SymbolTable::verify();
1158 }
1159 if (should_verify_subset(Verify_StringTable)) {
1160 log_debug(gc, verify)("StringTable");
1161 StringTable::verify();
1162 }
1163 if (should_verify_subset(Verify_CodeCache)) {
1164 {
1165 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1166 log_debug(gc, verify)("CodeCache");
1167 CodeCache::verify();
1168 }
1169 }
1170 if (should_verify_subset(Verify_SystemDictionary)) {
1171 log_debug(gc, verify)("SystemDictionary");
1172 SystemDictionary::verify();
1173 }
1174 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1175 log_debug(gc, verify)("ClassLoaderDataGraph");
1176 ClassLoaderDataGraph::verify();
1177 }
1178 if (should_verify_subset(Verify_MetaspaceUtils)) {
1179 log_debug(gc, verify)("MetaspaceUtils");
1180 MetaspaceUtils::verify_free_chunks();
1181 }
1182 if (should_verify_subset(Verify_JNIHandles)) {
1183 log_debug(gc, verify)("JNIHandles");
1184 JNIHandles::verify();
1185 }
1186 if (should_verify_subset(Verify_CodeCacheOops)) {
1187 log_debug(gc, verify)("CodeCache Oops");
1188 CodeCache::verify_oops();
1189 }
1190 if (should_verify_subset(Verify_ResolvedMethodTable)) {
1191 log_debug(gc, verify)("ResolvedMethodTable Oops");
1192 ResolvedMethodTable::verify();
1193 }
1194
1195 _verify_in_progress = false;
1196 }
1197
1198
1199 #ifndef PRODUCT
1200 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1201 assert(low_boundary < high_boundary, "bad interval");
1202
1203 // decide which low-order bits we require to be clear:
1204 size_t alignSize = MinObjAlignmentInBytes;
1205 size_t min_object_size = CollectedHeap::min_fill_size();
1206
1207 // make an inclusive limit:
1208 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1209 uintptr_t min = (uintptr_t)low_boundary;
1210 assert(min < max, "bad interval");
1211 uintptr_t diff = max ^ min;
1212
1213 // throw away enough low-order bits to make the diff vanish
1214 uintptr_t mask = (uintptr_t)(-1);
1215 while ((mask & diff) != 0)
1216 mask <<= 1;
1217 uintptr_t bits = (min & mask);
1218 assert(bits == (max & mask), "correct mask");
1219 // check an intermediate value between min and max, just to make sure:
1220 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1221
1222 // require address alignment, too:
1223 mask |= (alignSize - 1);
1224
1225 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1226 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1227 }
1228 _verify_oop_mask = mask;
1229 _verify_oop_bits = bits;
1230 }
1231
1232 // Oop verification (see MacroAssembler::verify_oop)
1233
1234 uintptr_t Universe::verify_oop_mask() {
1235 return _verify_oop_mask;
1236 }
1237
1238 uintptr_t Universe::verify_oop_bits() {
1239 return _verify_oop_bits;
1240 }
1241
1242 uintptr_t Universe::verify_mark_mask() {
1243 return markWord::lock_mask_in_place;
1244 }
1245
1246 uintptr_t Universe::verify_mark_bits() {
1247 intptr_t mask = verify_mark_mask();
1248 intptr_t bits = (intptr_t)markWord::prototype().value();
1249 assert((bits & ~mask) == 0, "no stray header bits");
1250 return bits;
1251 }
1252 #endif // PRODUCT
1253
1254
1255 void LatestMethodCache::init(Klass* k, Method* m) {
1256 if (!UseSharedSpaces) {
1257 _klass = k;
1258 }
1259 #ifndef PRODUCT
1260 else {
1261 // sharing initilization should have already set up _klass
1262 assert(_klass != NULL, "just checking");
1263 }
1264 #endif
1265
1266 _method_idnum = m->method_idnum();
1267 assert(_method_idnum >= 0, "sanity check");
1268 }
1269
1270
1271 Method* LatestMethodCache::get_method() {
1272 if (klass() == NULL) return NULL;
1273 InstanceKlass* ik = InstanceKlass::cast(klass());
1274 Method* m = ik->method_with_idnum(method_idnum());
1275 assert(m != NULL, "sanity check");
1276 return m;
1277 }
1278
1279
1280 #ifdef ASSERT
1281 // Release dummy object(s) at bottom of heap
1282 bool Universe::release_fullgc_alot_dummy() {
1283 MutexLocker ml(FullGCALot_lock);
1284 objArrayOop fullgc_alot_dummy_array = (objArrayOop)_fullgc_alot_dummy_array.resolve();
1285 if (fullgc_alot_dummy_array != NULL) {
1286 if (_fullgc_alot_dummy_next >= fullgc_alot_dummy_array->length()) {
1287 // No more dummies to release, release entire array instead
1288 _fullgc_alot_dummy_array.release(Universe::vm_global());
1289 return false;
1290 }
1291
1292 // Release dummy at bottom of old generation
1293 fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1294 }
1295 return true;
1296 }
1297
1298 #endif // ASSERT