1 /*
2 * Copyright (c) 1997, 2018, 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/systemDictionary.hpp"
32 #include "classfile/vmSymbols.hpp"
33 #include "code/codeCache.hpp"
34 #include "code/dependencies.hpp"
35 #include "gc/shared/collectedHeap.inline.hpp"
36 #include "gc/shared/gcArguments.hpp"
37 #include "gc/shared/gcConfig.hpp"
38 #include "gc/shared/gcTraceTime.inline.hpp"
39 #include "interpreter/interpreter.hpp"
40 #include "logging/log.hpp"
41 #include "logging/logStream.hpp"
42 #include "memory/heapShared.hpp"
43 #include "memory/filemap.hpp"
44 #include "memory/metadataFactory.hpp"
45 #include "memory/metaspaceClosure.hpp"
46 #include "memory/metaspaceCounters.hpp"
47 #include "memory/metaspaceShared.hpp"
48 #include "memory/oopFactory.hpp"
49 #include "memory/resourceArea.hpp"
50 #include "memory/universe.hpp"
51 #include "memory/universe.hpp"
52 #include "oops/constantPool.hpp"
53 #include "oops/instanceClassLoaderKlass.hpp"
54 #include "oops/instanceKlass.hpp"
55 #include "oops/instanceMirrorKlass.hpp"
56 #include "oops/instanceRefKlass.hpp"
57 #include "oops/objArrayOop.inline.hpp"
58 #include "oops/oop.inline.hpp"
59 #include "oops/typeArrayKlass.hpp"
60 #include "prims/resolvedMethodTable.hpp"
61 #include "runtime/arguments.hpp"
62 #include "runtime/atomic.hpp"
63 #include "runtime/flags/flagSetting.hpp"
64 #include "runtime/flags/jvmFlagConstraintList.hpp"
65 #include "runtime/deoptimization.hpp"
66 #include "runtime/handles.inline.hpp"
67 #include "runtime/init.hpp"
68 #include "runtime/java.hpp"
69 #include "runtime/javaCalls.hpp"
70 #include "runtime/sharedRuntime.hpp"
71 #include "runtime/synchronizer.hpp"
72 #include "runtime/thread.inline.hpp"
73 #include "runtime/timerTrace.hpp"
74 #include "runtime/vm_operations.hpp"
75 #include "services/memoryService.hpp"
76 #include "utilities/align.hpp"
77 #include "utilities/copy.hpp"
78 #include "utilities/debug.hpp"
79 #include "utilities/events.hpp"
80 #include "utilities/formatBuffer.hpp"
81 #include "utilities/hashtable.inline.hpp"
82 #include "utilities/macros.hpp"
83 #include "utilities/ostream.hpp"
84 #include "utilities/preserveException.hpp"
85
86 // Known objects
87 Klass* Universe::_typeArrayKlassObjs[T_LONG+1] = { NULL /*, NULL...*/ };
88 Klass* Universe::_objectArrayKlassObj = NULL;
89 oop Universe::_int_mirror = NULL;
90 oop Universe::_float_mirror = NULL;
91 oop Universe::_double_mirror = NULL;
92 oop Universe::_byte_mirror = NULL;
93 oop Universe::_bool_mirror = NULL;
94 oop Universe::_char_mirror = NULL;
95 oop Universe::_long_mirror = NULL;
96 oop Universe::_short_mirror = NULL;
97 oop Universe::_void_mirror = NULL;
98 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ };
99 oop Universe::_main_thread_group = NULL;
100 oop Universe::_system_thread_group = NULL;
101 objArrayOop Universe::_the_empty_class_klass_array = NULL;
102 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
103 oop Universe::_the_null_sentinel = NULL;
104 oop Universe::_the_null_string = NULL;
105 oop Universe::_the_min_jint_string = NULL;
106 LatestMethodCache* Universe::_finalizer_register_cache = NULL;
107 LatestMethodCache* Universe::_loader_addClass_cache = NULL;
108 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL;
109 LatestMethodCache* Universe::_do_stack_walk_cache = NULL;
110 oop Universe::_out_of_memory_error_java_heap = NULL;
111 oop Universe::_out_of_memory_error_metaspace = NULL;
112 oop Universe::_out_of_memory_error_class_metaspace = NULL;
113 oop Universe::_out_of_memory_error_array_size = NULL;
114 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL;
115 oop Universe::_out_of_memory_error_realloc_objects = NULL;
116 oop Universe::_out_of_memory_error_retry = NULL;
117 oop Universe::_delayed_stack_overflow_error_message = NULL;
118 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL;
119 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
120 bool Universe::_verify_in_progress = false;
121 long Universe::verify_flags = Universe::Verify_All;
122 oop Universe::_null_ptr_exception_instance = NULL;
123 oop Universe::_arithmetic_exception_instance = NULL;
124 oop Universe::_virtual_machine_error_instance = NULL;
125 oop Universe::_vm_exception = NULL;
126 oop Universe::_reference_pending_list = NULL;
127
128 Array<int>* Universe::_the_empty_int_array = NULL;
129 Array<u2>* Universe::_the_empty_short_array = NULL;
130 Array<Klass*>* Universe::_the_empty_klass_array = NULL;
131 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = NULL;
132 Array<Method*>* Universe::_the_empty_method_array = NULL;
133
134 // These variables are guarded by FullGCALot_lock.
135 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;)
136 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
137
138 // Heap
139 int Universe::_verify_count = 0;
140
141 // Oop verification (see MacroAssembler::verify_oop)
142 uintptr_t Universe::_verify_oop_mask = 0;
143 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
144
145 int Universe::_base_vtable_size = 0;
146 bool Universe::_bootstrapping = false;
147 bool Universe::_module_initialized = false;
148 bool Universe::_fully_initialized = false;
149
150 size_t Universe::_heap_capacity_at_last_gc;
151 size_t Universe::_heap_used_at_last_gc = 0;
152
153 CollectedHeap* Universe::_collectedHeap = NULL;
154
155 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true };
156 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true };
157 address Universe::_narrow_ptrs_base;
158 uint64_t Universe::_narrow_klass_range = (uint64_t(max_juint)+1);
159
160 void Universe::basic_type_classes_do(void f(Klass*)) {
161 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
162 f(_typeArrayKlassObjs[i]);
163 }
164 }
165
166 void Universe::basic_type_classes_do(KlassClosure *closure) {
167 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
168 closure->do_klass(_typeArrayKlassObjs[i]);
169 }
170 }
171
172 void Universe::oops_do(OopClosure* f) {
173
174 f->do_oop((oop*) &_int_mirror);
175 f->do_oop((oop*) &_float_mirror);
176 f->do_oop((oop*) &_double_mirror);
177 f->do_oop((oop*) &_byte_mirror);
178 f->do_oop((oop*) &_bool_mirror);
179 f->do_oop((oop*) &_char_mirror);
180 f->do_oop((oop*) &_long_mirror);
181 f->do_oop((oop*) &_short_mirror);
182 f->do_oop((oop*) &_void_mirror);
183
184 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
185 f->do_oop((oop*) &_mirrors[i]);
186 }
187 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
188
189 f->do_oop((oop*)&_the_empty_class_klass_array);
190 f->do_oop((oop*)&_the_null_sentinel);
191 f->do_oop((oop*)&_the_null_string);
192 f->do_oop((oop*)&_the_min_jint_string);
193 f->do_oop((oop*)&_out_of_memory_error_java_heap);
194 f->do_oop((oop*)&_out_of_memory_error_metaspace);
195 f->do_oop((oop*)&_out_of_memory_error_class_metaspace);
196 f->do_oop((oop*)&_out_of_memory_error_array_size);
197 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit);
198 f->do_oop((oop*)&_out_of_memory_error_realloc_objects);
199 f->do_oop((oop*)&_out_of_memory_error_retry);
200 f->do_oop((oop*)&_delayed_stack_overflow_error_message);
201 f->do_oop((oop*)&_preallocated_out_of_memory_error_array);
202 f->do_oop((oop*)&_null_ptr_exception_instance);
203 f->do_oop((oop*)&_arithmetic_exception_instance);
204 f->do_oop((oop*)&_virtual_machine_error_instance);
205 f->do_oop((oop*)&_main_thread_group);
206 f->do_oop((oop*)&_system_thread_group);
207 f->do_oop((oop*)&_vm_exception);
208 f->do_oop((oop*)&_reference_pending_list);
209 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);)
210 }
211
212 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
213 it->push(&_klass);
214 }
215
216 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
217 for (int i = 0; i < T_LONG+1; i++) {
218 it->push(&_typeArrayKlassObjs[i]);
219 }
220 it->push(&_objectArrayKlassObj);
221
222 it->push(&_the_empty_int_array);
223 it->push(&_the_empty_short_array);
224 it->push(&_the_empty_klass_array);
225 it->push(&_the_empty_instance_klass_array);
226 it->push(&_the_empty_method_array);
227 it->push(&_the_array_interfaces_array);
228
229 _finalizer_register_cache->metaspace_pointers_do(it);
230 _loader_addClass_cache->metaspace_pointers_do(it);
231 _throw_illegal_access_error_cache->metaspace_pointers_do(it);
232 _do_stack_walk_cache->metaspace_pointers_do(it);
233 }
234
235 // Serialize metadata and pointers to primitive type mirrors in and out of CDS archive
236 void Universe::serialize(SerializeClosure* f) {
237
238 for (int i = 0; i < T_LONG+1; i++) {
239 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
240 }
241
242 f->do_ptr((void**)&_objectArrayKlassObj);
243 #if INCLUDE_CDS_JAVA_HEAP
244 #ifdef ASSERT
245 if (DumpSharedSpaces && !HeapShared::is_heap_object_archiving_allowed()) {
246 assert(_int_mirror == NULL && _float_mirror == NULL &&
247 _double_mirror == NULL && _byte_mirror == NULL &&
248 _bool_mirror == NULL && _char_mirror == NULL &&
249 _long_mirror == NULL && _short_mirror == NULL &&
250 _void_mirror == NULL, "mirrors should be NULL");
251 }
252 #endif
253 f->do_oop(&_int_mirror);
254 f->do_oop(&_float_mirror);
255 f->do_oop(&_double_mirror);
256 f->do_oop(&_byte_mirror);
257 f->do_oop(&_bool_mirror);
258 f->do_oop(&_char_mirror);
259 f->do_oop(&_long_mirror);
260 f->do_oop(&_short_mirror);
261 f->do_oop(&_void_mirror);
262 #endif
263
264 f->do_ptr((void**)&_the_array_interfaces_array);
265 f->do_ptr((void**)&_the_empty_int_array);
266 f->do_ptr((void**)&_the_empty_short_array);
267 f->do_ptr((void**)&_the_empty_method_array);
268 f->do_ptr((void**)&_the_empty_klass_array);
269 f->do_ptr((void**)&_the_empty_instance_klass_array);
270 _finalizer_register_cache->serialize(f);
271 _loader_addClass_cache->serialize(f);
272 _throw_illegal_access_error_cache->serialize(f);
273 _do_stack_walk_cache->serialize(f);
274 }
275
276 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
277 if (size < alignment || size % alignment != 0) {
278 vm_exit_during_initialization(
279 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
280 }
281 }
282
283 void initialize_basic_type_klass(Klass* k, TRAPS) {
284 Klass* ok = SystemDictionary::Object_klass();
285 #if INCLUDE_CDS
286 if (UseSharedSpaces) {
287 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
288 assert(k->super() == ok, "u3");
289 k->restore_unshareable_info(loader_data, Handle(), CHECK);
290 } else
291 #endif
292 {
293 k->initialize_supers(ok, NULL, CHECK);
294 }
295 k->append_to_sibling_list();
296 }
297
298 void Universe::genesis(TRAPS) {
299 ResourceMark rm;
300
301 { FlagSetting fs(_bootstrapping, true);
302
303 { MutexLocker mc(Compile_lock);
304
305 java_lang_Class::allocate_fixup_lists();
306
307 // determine base vtable size; without that we cannot create the array klasses
308 compute_base_vtable_size();
309
310 if (!UseSharedSpaces) {
311 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
312 _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK);
313 }
314
315 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
316
317 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
318 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
319 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
320 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
321 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
322 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK);
323 }
324 }
325
326 vmSymbols::initialize(CHECK);
327
328 SystemDictionary::initialize(CHECK);
329
330 Klass* ok = SystemDictionary::Object_klass();
331
332 _the_null_string = StringTable::intern("null", CHECK);
333 _the_min_jint_string = StringTable::intern("-2147483648", CHECK);
334
335 #if INCLUDE_CDS
336 if (UseSharedSpaces) {
337 // Verify shared interfaces array.
338 assert(_the_array_interfaces_array->at(0) ==
339 SystemDictionary::Cloneable_klass(), "u3");
340 assert(_the_array_interfaces_array->at(1) ==
341 SystemDictionary::Serializable_klass(), "u3");
342 } else
343 #endif
344 {
345 // Set up shared interfaces array. (Do this before supers are set up.)
346 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
347 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
348 }
349
350 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
351 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
352 initialize_basic_type_klass(floatArrayKlassObj(), CHECK);
353 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
354 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
355 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
356 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
357 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
358 } // end of core bootstrapping
359
360 {
361 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
362 _the_null_sentinel = tns();
363 }
364
365 // Maybe this could be lifted up now that object array can be initialized
366 // during the bootstrapping.
367
368 // OLD
369 // Initialize _objectArrayKlass after core bootstraping to make
370 // sure the super class is set up properly for _objectArrayKlass.
371 // ---
372 // NEW
373 // Since some of the old system object arrays have been converted to
374 // ordinary object arrays, _objectArrayKlass will be loaded when
375 // SystemDictionary::initialize(CHECK); is run. See the extra check
376 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
377 _objectArrayKlassObj = InstanceKlass::
378 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
379 // OLD
380 // Add the class to the class hierarchy manually to make sure that
381 // its vtable is initialized after core bootstrapping is completed.
382 // ---
383 // New
384 // Have already been initialized.
385 _objectArrayKlassObj->append_to_sibling_list();
386
387 #ifdef ASSERT
388 if (FullGCALot) {
389 // Allocate an array of dummy objects.
390 // We'd like these to be at the bottom of the old generation,
391 // so that when we free one and then collect,
392 // (almost) the whole heap moves
393 // and we find out if we actually update all the oops correctly.
394 // But we can't allocate directly in the old generation,
395 // so we allocate wherever, and hope that the first collection
396 // moves these objects to the bottom of the old generation.
397 // We can allocate directly in the permanent generation, so we do.
398 int size;
399 if (UseConcMarkSweepGC) {
400 log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate");
401 size = FullGCALotDummies;
402 } else {
403 size = FullGCALotDummies * 2;
404 }
405 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
406 objArrayHandle dummy_array(THREAD, naked_array);
407 int i = 0;
408 while (i < size) {
409 // Allocate dummy in old generation
410 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK);
411 dummy_array->obj_at_put(i++, dummy);
412 }
413 {
414 // Only modify the global variable inside the mutex.
415 // If we had a race to here, the other dummy_array instances
416 // and their elements just get dropped on the floor, which is fine.
417 MutexLocker ml(FullGCALot_lock);
418 if (_fullgc_alot_dummy_array == NULL) {
419 _fullgc_alot_dummy_array = dummy_array();
420 }
421 }
422 assert(i == _fullgc_alot_dummy_array->length(), "just checking");
423 }
424 #endif
425 }
426
427 void Universe::initialize_basic_type_mirrors(TRAPS) {
428 #if INCLUDE_CDS_JAVA_HEAP
429 if (UseSharedSpaces &&
430 HeapShared::open_archive_heap_region_mapped() &&
431 _int_mirror != NULL) {
432 assert(HeapShared::is_heap_object_archiving_allowed(), "Sanity");
433 assert(_float_mirror != NULL && _double_mirror != NULL &&
434 _byte_mirror != NULL && _byte_mirror != NULL &&
435 _bool_mirror != NULL && _char_mirror != NULL &&
436 _long_mirror != NULL && _short_mirror != NULL &&
437 _void_mirror != NULL, "Sanity");
438 } else
439 #endif
440 {
441 _int_mirror =
442 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK);
443 _float_mirror =
444 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK);
445 _double_mirror =
446 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK);
447 _byte_mirror =
448 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK);
449 _bool_mirror =
450 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
451 _char_mirror =
452 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK);
453 _long_mirror =
454 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK);
455 _short_mirror =
456 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK);
457 _void_mirror =
458 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK);
459 }
460
461 _mirrors[T_INT] = _int_mirror;
462 _mirrors[T_FLOAT] = _float_mirror;
463 _mirrors[T_DOUBLE] = _double_mirror;
464 _mirrors[T_BYTE] = _byte_mirror;
465 _mirrors[T_BOOLEAN] = _bool_mirror;
466 _mirrors[T_CHAR] = _char_mirror;
467 _mirrors[T_LONG] = _long_mirror;
468 _mirrors[T_SHORT] = _short_mirror;
469 _mirrors[T_VOID] = _void_mirror;
470 //_mirrors[T_OBJECT] = _object_klass->java_mirror();
471 //_mirrors[T_ARRAY] = _object_klass->java_mirror();
472 }
473
474 void Universe::fixup_mirrors(TRAPS) {
475 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
476 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
477 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
478 // that the number of objects allocated at this point is very small.
479 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
480 HandleMark hm(THREAD);
481
482 if (!UseSharedSpaces) {
483 // Cache the start of the static fields
484 InstanceMirrorKlass::init_offset_of_static_fields();
485 }
486
487 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
488 int list_length = list->length();
489 for (int i = 0; i < list_length; i++) {
490 Klass* k = list->at(i);
491 assert(k->is_klass(), "List should only hold classes");
492 EXCEPTION_MARK;
493 java_lang_Class::fixup_mirror(k, CATCH);
494 }
495 delete java_lang_Class::fixup_mirror_list();
496 java_lang_Class::set_fixup_mirror_list(NULL);
497 }
498
499 #define assert_pll_locked(test) \
500 assert(Heap_lock->test(), "Reference pending list access requires lock")
501
502 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
503
504 oop Universe::reference_pending_list() {
505 if (Thread::current()->is_VM_thread()) {
506 assert_pll_locked(is_locked);
507 } else {
508 assert_pll_ownership();
509 }
510 return _reference_pending_list;
511 }
512
513 void Universe::set_reference_pending_list(oop list) {
514 assert_pll_ownership();
515 _reference_pending_list = list;
516 }
517
518 bool Universe::has_reference_pending_list() {
519 assert_pll_ownership();
520 return _reference_pending_list != NULL;
521 }
522
523 oop Universe::swap_reference_pending_list(oop list) {
524 assert_pll_locked(is_locked);
525 return Atomic::xchg(list, &_reference_pending_list);
526 }
527
528 #undef assert_pll_locked
529 #undef assert_pll_ownership
530
531 // initialize_vtable could cause gc if
532 // 1) we specified true to initialize_vtable and
533 // 2) this ran after gc was enabled
534 // In case those ever change we use handles for oops
535 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) {
536 // init vtable of k and all subclasses
537 ko->vtable().initialize_vtable(false, CHECK);
538 if (ko->is_instance_klass()) {
539 for (Klass* sk = ko->subklass();
540 sk != NULL;
541 sk = sk->next_sibling()) {
542 reinitialize_vtable_of(sk, CHECK);
543 }
544 }
545 }
546
547
548 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) {
549 k->itable().initialize_itable(false, CHECK);
550 }
551
552
553 void Universe::reinitialize_itables(TRAPS) {
554 MutexLocker mcld(ClassLoaderDataGraph_lock);
555 ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK);
556 }
557
558
559 bool Universe::on_page_boundary(void* addr) {
560 return is_aligned(addr, os::vm_page_size());
561 }
562
563
564 bool Universe::should_fill_in_stack_trace(Handle throwable) {
565 // never attempt to fill in the stack trace of preallocated errors that do not have
566 // backtrace. These errors are kept alive forever and may be "re-used" when all
567 // preallocated errors with backtrace have been consumed. Also need to avoid
568 // a potential loop which could happen if an out of memory occurs when attempting
569 // to allocate the backtrace.
570 return ((!oopDesc::equals(throwable(), Universe::_out_of_memory_error_java_heap)) &&
571 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_metaspace)) &&
572 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_class_metaspace)) &&
573 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_array_size)) &&
574 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_gc_overhead_limit)) &&
575 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_realloc_objects)) &&
576 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_retry)));
577 }
578
579
580 oop Universe::gen_out_of_memory_error(oop default_err) {
581 // generate an out of memory error:
582 // - if there is a preallocated error and stack traces are available
583 // (j.l.Throwable is initialized), then return the preallocated
584 // error with a filled in stack trace, and with the message
585 // provided by the default error.
586 // - otherwise, return the default error, without a stack trace.
587 int next;
588 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
589 SystemDictionary::Throwable_klass()->is_initialized()) {
590 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);
591 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
592 } else {
593 next = -1;
594 }
595 if (next < 0) {
596 // all preallocated errors have been used.
597 // return default
598 return default_err;
599 } else {
600 Thread* THREAD = Thread::current();
601 Handle default_err_h(THREAD, default_err);
602 // get the error object at the slot and set set it to NULL so that the
603 // array isn't keeping it alive anymore.
604 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next));
605 assert(exc() != NULL, "slot has been used already");
606 preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
607
608 // use the message from the default error
609 oop msg = java_lang_Throwable::message(default_err_h());
610 assert(msg != NULL, "no message");
611 java_lang_Throwable::set_message(exc(), msg);
612
613 // populate the stack trace and return it.
614 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
615 return exc();
616 }
617 }
618
619 intptr_t Universe::_non_oop_bits = 0;
620
621 void* Universe::non_oop_word() {
622 // Neither the high bits nor the low bits of this value is allowed
623 // to look like (respectively) the high or low bits of a real oop.
624 //
625 // High and low are CPU-specific notions, but low always includes
626 // the low-order bit. Since oops are always aligned at least mod 4,
627 // setting the low-order bit will ensure that the low half of the
628 // word will never look like that of a real oop.
629 //
630 // Using the OS-supplied non-memory-address word (usually 0 or -1)
631 // will take care of the high bits, however many there are.
632
633 if (_non_oop_bits == 0) {
634 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
635 }
636
637 return (void*)_non_oop_bits;
638 }
639
640 jint universe_init() {
641 assert(!Universe::_fully_initialized, "called after initialize_vtables");
642 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
643 "LogHeapWordSize is incorrect.");
644 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
645 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
646 "oop size is not not a multiple of HeapWord size");
647
648 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
649
650 JavaClasses::compute_hard_coded_offsets();
651
652 jint status = Universe::initialize_heap();
653 if (status != JNI_OK) {
654 return status;
655 }
656
657 SystemDictionary::initialize_oop_storage();
658
659 Metaspace::global_initialize();
660
661 // Initialize performance counters for metaspaces
662 MetaspaceCounters::initialize_performance_counters();
663 CompressedClassSpaceCounters::initialize_performance_counters();
664
665 AOTLoader::universe_init();
666
667 // Checks 'AfterMemoryInit' constraints.
668 if (!JVMFlagConstraintList::check_constraints(JVMFlagConstraint::AfterMemoryInit)) {
669 return JNI_EINVAL;
670 }
671
672 // Create memory for metadata. Must be after initializing heap for
673 // DumpSharedSpaces.
674 ClassLoaderData::init_null_class_loader_data();
675
676 // We have a heap so create the Method* caches before
677 // Metaspace::initialize_shared_spaces() tries to populate them.
678 Universe::_finalizer_register_cache = new LatestMethodCache();
679 Universe::_loader_addClass_cache = new LatestMethodCache();
680 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
681 Universe::_do_stack_walk_cache = new LatestMethodCache();
682
683 #if INCLUDE_CDS
684 if (UseSharedSpaces) {
685 // Read the data structures supporting the shared spaces (shared
686 // system dictionary, symbol table, etc.). After that, access to
687 // the file (other than the mapped regions) is no longer needed, and
688 // the file is closed. Closing the file does not affect the
689 // currently mapped regions.
690 MetaspaceShared::initialize_shared_spaces();
691 StringTable::create_table();
692 } else
693 #endif
694 {
695 SymbolTable::create_table();
696 StringTable::create_table();
697
698 #if INCLUDE_CDS
699 if (DumpSharedSpaces) {
700 MetaspaceShared::prepare_for_dumping();
701 }
702 #endif
703 }
704 if (strlen(VerifySubSet) > 0) {
705 Universe::initialize_verify_flags();
706 }
707
708 ResolvedMethodTable::create_table();
709
710 return JNI_OK;
711 }
712
713 CollectedHeap* Universe::create_heap() {
714 assert(_collectedHeap == NULL, "Heap already created");
715 return GCConfig::arguments()->create_heap();
716 }
717
718 // Choose the heap base address and oop encoding mode
719 // when compressed oops are used:
720 // Unscaled - Use 32-bits oops without encoding when
721 // NarrowOopHeapBaseMin + heap_size < 4Gb
722 // ZeroBased - Use zero based compressed oops with encoding when
723 // NarrowOopHeapBaseMin + heap_size < 32Gb
724 // HeapBased - Use compressed oops with heap base + encoding.
725
726 jint Universe::initialize_heap() {
727 _collectedHeap = create_heap();
728 jint status = _collectedHeap->initialize();
729 if (status != JNI_OK) {
730 return status;
731 }
732 log_info(gc)("Using %s", _collectedHeap->name());
733
734 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
735
736 #ifdef _LP64
737 if (UseCompressedOops) {
738 // Subtract a page because something can get allocated at heap base.
739 // This also makes implicit null checking work, because the
740 // memory+1 page below heap_base needs to cause a signal.
741 // See needs_explicit_null_check.
742 // Only set the heap base for compressed oops because it indicates
743 // compressed oops for pstack code.
744 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) {
745 // Didn't reserve heap below 4Gb. Must shift.
746 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
747 }
748 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) {
749 // Did reserve heap below 32Gb. Can use base == 0;
750 Universe::set_narrow_oop_base(0);
751 }
752 AOTLoader::set_narrow_oop_shift();
753
754 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base());
755
756 LogTarget(Info, gc, heap, coops) lt;
757 if (lt.is_enabled()) {
758 ResourceMark rm;
759 LogStream ls(lt);
760 Universe::print_compressed_oops_mode(&ls);
761 }
762
763 // Tell tests in which mode we run.
764 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode",
765 narrow_oop_mode_to_string(narrow_oop_mode()),
766 false));
767 }
768 // Universe::narrow_oop_base() is one page below the heap.
769 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() -
770 os::vm_page_size()) ||
771 Universe::narrow_oop_base() == NULL, "invalid value");
772 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes ||
773 Universe::narrow_oop_shift() == 0, "invalid value");
774 #endif
775
776 // We will never reach the CATCH below since Exceptions::_throw will cause
777 // the VM to exit if an exception is thrown during initialization
778
779 if (UseTLAB) {
780 assert(Universe::heap()->supports_tlab_allocation(),
781 "Should support thread-local allocation buffers");
782 ThreadLocalAllocBuffer::startup_initialization();
783 }
784 return JNI_OK;
785 }
786
787 void Universe::print_compressed_oops_mode(outputStream* st) {
788 st->print("Heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
789 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M);
790
791 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode()));
792
793 if (Universe::narrow_oop_base() != 0) {
794 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base()));
795 }
796
797 if (Universe::narrow_oop_shift() != 0) {
798 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
799 }
800
801 if (!Universe::narrow_oop_use_implicit_null_checks()) {
802 st->print(", no protected page in front of the heap");
803 }
804 st->cr();
805 }
806
807 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
808
809 assert(alignment <= Arguments::conservative_max_heap_alignment(),
810 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
811 alignment, Arguments::conservative_max_heap_alignment());
812
813 size_t total_reserved = align_up(heap_size, alignment);
814 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
815 "heap size is too big for compressed oops");
816
817 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size());
818 assert(!UseLargePages
819 || UseParallelGC
820 || use_large_pages, "Wrong alignment to use large pages");
821
822 // Now create the space.
823 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt);
824
825 if (total_rs.is_reserved()) {
826 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
827 "must be exactly of required size and alignment");
828 // We are good.
829
830 if (UseCompressedOops) {
831 // Universe::initialize_heap() will reset this to NULL if unscaled
832 // or zero-based narrow oops are actually used.
833 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
834 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
835 }
836
837 if (AllocateHeapAt != NULL) {
838 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
839 }
840 return total_rs;
841 }
842
843 vm_exit_during_initialization(
844 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
845 total_reserved/K));
846
847 // satisfy compiler
848 ShouldNotReachHere();
849 return ReservedHeapSpace(0, 0, false);
850 }
851
852
853 // It's the caller's responsibility to ensure glitch-freedom
854 // (if required).
855 void Universe::update_heap_info_at_gc() {
856 _heap_capacity_at_last_gc = heap()->capacity();
857 _heap_used_at_last_gc = heap()->used();
858 }
859
860
861 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) {
862 switch (mode) {
863 case UnscaledNarrowOop:
864 return "32-bit";
865 case ZeroBasedNarrowOop:
866 return "Zero based";
867 case DisjointBaseNarrowOop:
868 return "Non-zero disjoint base";
869 case HeapBasedNarrowOop:
870 return "Non-zero based";
871 default:
872 ShouldNotReachHere();
873 return "";
874 }
875 }
876
877
878 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() {
879 if (narrow_oop_base_disjoint()) {
880 return DisjointBaseNarrowOop;
881 }
882
883 if (narrow_oop_base() != 0) {
884 return HeapBasedNarrowOop;
885 }
886
887 if (narrow_oop_shift() != 0) {
888 return ZeroBasedNarrowOop;
889 }
890
891 return UnscaledNarrowOop;
892 }
893
894 void initialize_known_method(LatestMethodCache* method_cache,
895 InstanceKlass* ik,
896 const char* method,
897 Symbol* signature,
898 bool is_static, TRAPS)
899 {
900 TempNewSymbol name = SymbolTable::new_symbol(method, CHECK);
901 Method* m = NULL;
902 // The klass must be linked before looking up the method.
903 if (!ik->link_class_or_fail(THREAD) ||
904 ((m = ik->find_method(name, signature)) == NULL) ||
905 is_static != m->is_static()) {
906 ResourceMark rm(THREAD);
907 // NoSuchMethodException doesn't actually work because it tries to run the
908 // <init> function before java_lang_Class is linked. Print error and exit.
909 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
910 ik->name()->as_C_string(), method));
911 }
912 method_cache->init(ik, m);
913 }
914
915 void Universe::initialize_known_methods(TRAPS) {
916 // Set up static method for registering finalizers
917 initialize_known_method(_finalizer_register_cache,
918 SystemDictionary::Finalizer_klass(),
919 "register",
920 vmSymbols::object_void_signature(), true, CHECK);
921
922 initialize_known_method(_throw_illegal_access_error_cache,
923 SystemDictionary::internal_Unsafe_klass(),
924 "throwIllegalAccessError",
925 vmSymbols::void_method_signature(), true, CHECK);
926
927 // Set up method for registering loaded classes in class loader vector
928 initialize_known_method(_loader_addClass_cache,
929 SystemDictionary::ClassLoader_klass(),
930 "addClass",
931 vmSymbols::class_void_signature(), false, CHECK);
932
933 // Set up method for stack walking
934 initialize_known_method(_do_stack_walk_cache,
935 SystemDictionary::AbstractStackWalker_klass(),
936 "doStackWalk",
937 vmSymbols::doStackWalk_signature(), false, CHECK);
938 }
939
940 void universe2_init() {
941 EXCEPTION_MARK;
942 Universe::genesis(CATCH);
943 }
944
945 // Set after initialization of the module runtime, call_initModuleRuntime
946 void universe_post_module_init() {
947 Universe::_module_initialized = true;
948 }
949
950 bool universe_post_init() {
951 assert(!is_init_completed(), "Error: initialization not yet completed!");
952 Universe::_fully_initialized = true;
953 EXCEPTION_MARK;
954 { ResourceMark rm;
955 Interpreter::initialize(); // needed for interpreter entry points
956 if (!UseSharedSpaces) {
957 HandleMark hm(THREAD);
958 Klass* ok = SystemDictionary::Object_klass();
959 Universe::reinitialize_vtable_of(ok, CHECK_false);
960 Universe::reinitialize_itables(CHECK_false);
961 }
962 }
963
964 HandleMark hm(THREAD);
965 // Setup preallocated empty java.lang.Class array
966 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
967
968 // Setup preallocated OutOfMemoryError errors
969 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
970 InstanceKlass* ik = InstanceKlass::cast(k);
971 Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false);
972 Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false);
973 Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false);
974 Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false);
975 Universe::_out_of_memory_error_gc_overhead_limit =
976 ik->allocate_instance(CHECK_false);
977 Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false);
978 Universe::_out_of_memory_error_retry = ik->allocate_instance(CHECK_false);
979
980 // Setup preallocated cause message for delayed StackOverflowError
981 if (StackReservedPages > 0) {
982 Universe::_delayed_stack_overflow_error_message =
983 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
984 }
985
986 // Setup preallocated NullPointerException
987 // (this is currently used for a cheap & dirty solution in compiler exception handling)
988 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
989 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
990 // Setup preallocated ArithmeticException
991 // (this is currently used for a cheap & dirty solution in compiler exception handling)
992 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
993 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
994 // Virtual Machine Error for when we get into a situation we can't resolve
995 k = SystemDictionary::resolve_or_fail(
996 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
997 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
998 if (!linked) {
999 tty->print_cr("Unable to link/verify VirtualMachineError class");
1000 return false; // initialization failed
1001 }
1002 Universe::_virtual_machine_error_instance =
1003 InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1004
1005 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1006
1007 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
1008 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
1009
1010 msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
1011 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
1012 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
1013 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
1014
1015 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
1016 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
1017
1018 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
1019 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
1020
1021 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false);
1022 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg());
1023
1024 msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK_false);
1025 java_lang_Throwable::set_message(Universe::_out_of_memory_error_retry, msg());
1026
1027 msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1028 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
1029
1030 // Setup the array of errors that have preallocated backtrace
1031 k = Universe::_out_of_memory_error_java_heap->klass();
1032 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
1033 ik = InstanceKlass::cast(k);
1034
1035 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
1036 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false);
1037 for (int i=0; i<len; i++) {
1038 oop err = ik->allocate_instance(CHECK_false);
1039 Handle err_h = Handle(THREAD, err);
1040 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
1041 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
1042 }
1043 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
1044
1045 Universe::initialize_known_methods(CHECK_false);
1046
1047 // This needs to be done before the first scavenge/gc, since
1048 // it's an input to soft ref clearing policy.
1049 {
1050 MutexLocker x(Heap_lock);
1051 Universe::update_heap_info_at_gc();
1052 }
1053
1054 // ("weak") refs processing infrastructure initialization
1055 Universe::heap()->post_initialize();
1056
1057 MemoryService::add_metaspace_memory_pools();
1058
1059 MemoryService::set_universe_heap(Universe::heap());
1060 #if INCLUDE_CDS
1061 MetaspaceShared::post_initialize(CHECK_false);
1062 #endif
1063 return true;
1064 }
1065
1066
1067 void Universe::compute_base_vtable_size() {
1068 _base_vtable_size = ClassLoader::compute_Object_vtable();
1069 }
1070
1071 void Universe::print_on(outputStream* st) {
1072 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1073 st->print_cr("Heap");
1074 heap()->print_on(st);
1075 }
1076
1077 void Universe::print_heap_at_SIGBREAK() {
1078 if (PrintHeapAtSIGBREAK) {
1079 print_on(tty);
1080 tty->cr();
1081 tty->flush();
1082 }
1083 }
1084
1085 void Universe::print_heap_before_gc() {
1086 LogTarget(Debug, gc, heap) lt;
1087 if (lt.is_enabled()) {
1088 LogStream ls(lt);
1089 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1090 ResourceMark rm;
1091 heap()->print_on(&ls);
1092 }
1093 }
1094
1095 void Universe::print_heap_after_gc() {
1096 LogTarget(Debug, gc, heap) lt;
1097 if (lt.is_enabled()) {
1098 LogStream ls(lt);
1099 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1100 ResourceMark rm;
1101 heap()->print_on(&ls);
1102 }
1103 }
1104
1105 void Universe::initialize_verify_flags() {
1106 verify_flags = 0;
1107 const char delimiter[] = " ,";
1108
1109 size_t length = strlen(VerifySubSet);
1110 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1111 strncpy(subset_list, VerifySubSet, length + 1);
1112
1113 char* token = strtok(subset_list, delimiter);
1114 while (token != NULL) {
1115 if (strcmp(token, "threads") == 0) {
1116 verify_flags |= Verify_Threads;
1117 } else if (strcmp(token, "heap") == 0) {
1118 verify_flags |= Verify_Heap;
1119 } else if (strcmp(token, "symbol_table") == 0) {
1120 verify_flags |= Verify_SymbolTable;
1121 } else if (strcmp(token, "string_table") == 0) {
1122 verify_flags |= Verify_StringTable;
1123 } else if (strcmp(token, "codecache") == 0) {
1124 verify_flags |= Verify_CodeCache;
1125 } else if (strcmp(token, "dictionary") == 0) {
1126 verify_flags |= Verify_SystemDictionary;
1127 } else if (strcmp(token, "classloader_data_graph") == 0) {
1128 verify_flags |= Verify_ClassLoaderDataGraph;
1129 } else if (strcmp(token, "metaspace") == 0) {
1130 verify_flags |= Verify_MetaspaceUtils;
1131 } else if (strcmp(token, "jni_handles") == 0) {
1132 verify_flags |= Verify_JNIHandles;
1133 } else if (strcmp(token, "codecache_oops") == 0) {
1134 verify_flags |= Verify_CodeCacheOops;
1135 } else {
1136 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1137 }
1138 token = strtok(NULL, delimiter);
1139 }
1140 FREE_C_HEAP_ARRAY(char, subset_list);
1141 }
1142
1143 bool Universe::should_verify_subset(uint subset) {
1144 if (verify_flags & subset) {
1145 return true;
1146 }
1147 return false;
1148 }
1149
1150 void Universe::verify(VerifyOption option, const char* prefix) {
1151 // The use of _verify_in_progress is a temporary work around for
1152 // 6320749. Don't bother with a creating a class to set and clear
1153 // it since it is only used in this method and the control flow is
1154 // straight forward.
1155 _verify_in_progress = true;
1156
1157 COMPILER2_PRESENT(
1158 assert(!DerivedPointerTable::is_active(),
1159 "DPT should not be active during verification "
1160 "(of thread stacks below)");
1161 )
1162
1163 ResourceMark rm;
1164 HandleMark hm; // Handles created during verification can be zapped
1165 _verify_count++;
1166
1167 FormatBuffer<> title("Verifying %s", prefix);
1168 GCTraceTime(Info, gc, verify) tm(title.buffer());
1169 if (should_verify_subset(Verify_Threads)) {
1170 log_debug(gc, verify)("Threads");
1171 Threads::verify();
1172 }
1173 if (should_verify_subset(Verify_Heap)) {
1174 log_debug(gc, verify)("Heap");
1175 heap()->verify(option);
1176 }
1177 if (should_verify_subset(Verify_SymbolTable)) {
1178 log_debug(gc, verify)("SymbolTable");
1179 SymbolTable::verify();
1180 }
1181 if (should_verify_subset(Verify_StringTable)) {
1182 log_debug(gc, verify)("StringTable");
1183 StringTable::verify();
1184 }
1185 if (should_verify_subset(Verify_CodeCache)) {
1186 {
1187 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1188 log_debug(gc, verify)("CodeCache");
1189 CodeCache::verify();
1190 }
1191 }
1192 if (should_verify_subset(Verify_SystemDictionary)) {
1193 log_debug(gc, verify)("SystemDictionary");
1194 SystemDictionary::verify();
1195 }
1196 #ifndef PRODUCT
1197 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1198 log_debug(gc, verify)("ClassLoaderDataGraph");
1199 ClassLoaderDataGraph::verify();
1200 }
1201 #endif
1202 if (should_verify_subset(Verify_MetaspaceUtils)) {
1203 log_debug(gc, verify)("MetaspaceUtils");
1204 MetaspaceUtils::verify_free_chunks();
1205 }
1206 if (should_verify_subset(Verify_JNIHandles)) {
1207 log_debug(gc, verify)("JNIHandles");
1208 JNIHandles::verify();
1209 }
1210 if (should_verify_subset(Verify_CodeCacheOops)) {
1211 log_debug(gc, verify)("CodeCache Oops");
1212 CodeCache::verify_oops();
1213 }
1214
1215 _verify_in_progress = false;
1216 }
1217
1218
1219 #ifndef PRODUCT
1220 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1221 assert(low_boundary < high_boundary, "bad interval");
1222
1223 // decide which low-order bits we require to be clear:
1224 size_t alignSize = MinObjAlignmentInBytes;
1225 size_t min_object_size = CollectedHeap::min_fill_size();
1226
1227 // make an inclusive limit:
1228 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1229 uintptr_t min = (uintptr_t)low_boundary;
1230 assert(min < max, "bad interval");
1231 uintptr_t diff = max ^ min;
1232
1233 // throw away enough low-order bits to make the diff vanish
1234 uintptr_t mask = (uintptr_t)(-1);
1235 while ((mask & diff) != 0)
1236 mask <<= 1;
1237 uintptr_t bits = (min & mask);
1238 assert(bits == (max & mask), "correct mask");
1239 // check an intermediate value between min and max, just to make sure:
1240 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1241
1242 // require address alignment, too:
1243 mask |= (alignSize - 1);
1244
1245 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1246 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1247 }
1248 _verify_oop_mask = mask;
1249 _verify_oop_bits = bits;
1250 }
1251
1252 // Oop verification (see MacroAssembler::verify_oop)
1253
1254 uintptr_t Universe::verify_oop_mask() {
1255 MemRegion m = heap()->reserved_region();
1256 calculate_verify_data(m.start(), m.end());
1257 return _verify_oop_mask;
1258 }
1259
1260 uintptr_t Universe::verify_oop_bits() {
1261 MemRegion m = heap()->reserved_region();
1262 calculate_verify_data(m.start(), m.end());
1263 return _verify_oop_bits;
1264 }
1265
1266 uintptr_t Universe::verify_mark_mask() {
1267 return markOopDesc::lock_mask_in_place;
1268 }
1269
1270 uintptr_t Universe::verify_mark_bits() {
1271 intptr_t mask = verify_mark_mask();
1272 intptr_t bits = (intptr_t)markOopDesc::prototype();
1273 assert((bits & ~mask) == 0, "no stray header bits");
1274 return bits;
1275 }
1276 #endif // PRODUCT
1277
1278
1279 void Universe::compute_verify_oop_data() {
1280 verify_oop_mask();
1281 verify_oop_bits();
1282 verify_mark_mask();
1283 verify_mark_bits();
1284 }
1285
1286
1287 void LatestMethodCache::init(Klass* k, Method* m) {
1288 if (!UseSharedSpaces) {
1289 _klass = k;
1290 }
1291 #ifndef PRODUCT
1292 else {
1293 // sharing initilization should have already set up _klass
1294 assert(_klass != NULL, "just checking");
1295 }
1296 #endif
1297
1298 _method_idnum = m->method_idnum();
1299 assert(_method_idnum >= 0, "sanity check");
1300 }
1301
1302
1303 Method* LatestMethodCache::get_method() {
1304 if (klass() == NULL) return NULL;
1305 InstanceKlass* ik = InstanceKlass::cast(klass());
1306 Method* m = ik->method_with_idnum(method_idnum());
1307 assert(m != NULL, "sanity check");
1308 return m;
1309 }
1310
1311
1312 #ifdef ASSERT
1313 // Release dummy object(s) at bottom of heap
1314 bool Universe::release_fullgc_alot_dummy() {
1315 MutexLocker ml(FullGCALot_lock);
1316 if (_fullgc_alot_dummy_array != NULL) {
1317 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
1318 // No more dummies to release, release entire array instead
1319 _fullgc_alot_dummy_array = NULL;
1320 return false;
1321 }
1322 if (!UseConcMarkSweepGC) {
1323 // Release dummy at bottom of old generation
1324 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1325 }
1326 // Release dummy at bottom of permanent generation
1327 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1328 }
1329 return true;
1330 }
1331
1332 #endif // ASSERT