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/filemap.hpp"
43 #include "memory/metadataFactory.hpp"
44 #include "memory/metaspaceClosure.hpp"
45 #include "memory/metaspaceCounters.hpp"
46 #include "memory/metaspaceShared.hpp"
47 #include "memory/oopFactory.hpp"
48 #include "memory/resourceArea.hpp"
49 #include "memory/universe.hpp"
50 #include "memory/universe.hpp"
51 #include "oops/constantPool.hpp"
52 #include "oops/instanceClassLoaderKlass.hpp"
53 #include "oops/instanceKlass.hpp"
54 #include "oops/instanceMirrorKlass.hpp"
55 #include "oops/instanceRefKlass.hpp"
56 #include "oops/objArrayOop.inline.hpp"
57 #include "oops/oop.inline.hpp"
58 #include "oops/typeArrayKlass.hpp"
59 #include "prims/resolvedMethodTable.hpp"
60 #include "runtime/arguments.hpp"
61 #include "runtime/atomic.hpp"
62 #include "runtime/flags/flagSetting.hpp"
63 #include "runtime/flags/jvmFlagConstraintList.hpp"
64 #include "runtime/deoptimization.hpp"
65 #include "runtime/handles.inline.hpp"
66 #include "runtime/init.hpp"
67 #include "runtime/java.hpp"
68 #include "runtime/javaCalls.hpp"
69 #include "runtime/sharedRuntime.hpp"
70 #include "runtime/synchronizer.hpp"
71 #include "runtime/thread.inline.hpp"
72 #include "runtime/timerTrace.hpp"
73 #include "runtime/vm_operations.hpp"
74 #include "services/memoryService.hpp"
75 #include "utilities/align.hpp"
76 #include "utilities/copy.hpp"
77 #include "utilities/debug.hpp"
78 #include "utilities/events.hpp"
79 #include "utilities/formatBuffer.hpp"
80 #include "utilities/hashtable.inline.hpp"
81 #include "utilities/macros.hpp"
82 #include "utilities/ostream.hpp"
83 #include "utilities/preserveException.hpp"
84
85 // Known objects
86 Klass* Universe::_typeArrayKlassObjs[T_LONG+1] = { NULL /*, NULL...*/ };
87 Klass* Universe::_objectArrayKlassObj = NULL;
88 oop Universe::_int_mirror = NULL;
89 oop Universe::_float_mirror = NULL;
90 oop Universe::_double_mirror = NULL;
91 oop Universe::_byte_mirror = NULL;
92 oop Universe::_bool_mirror = NULL;
93 oop Universe::_char_mirror = NULL;
94 oop Universe::_long_mirror = NULL;
95 oop Universe::_short_mirror = NULL;
96 oop Universe::_void_mirror = NULL;
97 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ };
98 oop Universe::_main_thread_group = NULL;
99 oop Universe::_system_thread_group = NULL;
100 objArrayOop Universe::_the_empty_class_klass_array = NULL;
101 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
102 oop Universe::_the_null_sentinel = NULL;
103 oop Universe::_the_null_string = NULL;
104 oop Universe::_the_min_jint_string = NULL;
105 LatestMethodCache* Universe::_finalizer_register_cache = NULL;
106 LatestMethodCache* Universe::_loader_addClass_cache = NULL;
107 LatestMethodCache* Universe::_pd_implies_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 _pd_implies_cache->metaspace_pointers_do(it);
232 _throw_illegal_access_error_cache->metaspace_pointers_do(it);
233 _do_stack_walk_cache->metaspace_pointers_do(it);
234 }
235
236 // Serialize metadata and pointers to primitive type mirrors in and out of CDS archive
237 void Universe::serialize(SerializeClosure* f) {
238
239 for (int i = 0; i < T_LONG+1; i++) {
240 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
241 }
242
243 f->do_ptr((void**)&_objectArrayKlassObj);
244 #if INCLUDE_CDS_JAVA_HEAP
245 // The mirrors are NULL if MetaspaceShared::is_heap_object_archiving_allowed
246 // is false.
247 f->do_oop(&_int_mirror);
248 f->do_oop(&_float_mirror);
249 f->do_oop(&_double_mirror);
250 f->do_oop(&_byte_mirror);
251 f->do_oop(&_bool_mirror);
252 f->do_oop(&_char_mirror);
253 f->do_oop(&_long_mirror);
254 f->do_oop(&_short_mirror);
255 f->do_oop(&_void_mirror);
256 #endif
257
258 f->do_ptr((void**)&_the_array_interfaces_array);
259 f->do_ptr((void**)&_the_empty_int_array);
260 f->do_ptr((void**)&_the_empty_short_array);
261 f->do_ptr((void**)&_the_empty_method_array);
262 f->do_ptr((void**)&_the_empty_klass_array);
263 f->do_ptr((void**)&_the_empty_instance_klass_array);
264 _finalizer_register_cache->serialize(f);
265 _loader_addClass_cache->serialize(f);
266 _pd_implies_cache->serialize(f);
267 _throw_illegal_access_error_cache->serialize(f);
268 _do_stack_walk_cache->serialize(f);
269 }
270
271 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
272 if (size < alignment || size % alignment != 0) {
273 vm_exit_during_initialization(
274 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
275 }
276 }
277
278 void initialize_basic_type_klass(Klass* k, TRAPS) {
279 Klass* ok = SystemDictionary::Object_klass();
280 #if INCLUDE_CDS
281 if (UseSharedSpaces) {
282 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
283 assert(k->super() == ok, "u3");
284 k->restore_unshareable_info(loader_data, Handle(), CHECK);
285 } else
286 #endif
287 {
288 k->initialize_supers(ok, NULL, CHECK);
289 }
290 k->append_to_sibling_list();
291 }
292
293 void Universe::genesis(TRAPS) {
294 ResourceMark rm;
295
296 { FlagSetting fs(_bootstrapping, true);
297
298 { MutexLocker mc(Compile_lock);
299
300 java_lang_Class::allocate_fixup_lists();
301
302 // determine base vtable size; without that we cannot create the array klasses
303 compute_base_vtable_size();
304
305 if (!UseSharedSpaces) {
306 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
307 _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK);
308 }
309
310 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
311
312 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
313 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
314 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
315 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
316 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
317 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK);
318 }
319 }
320
321 vmSymbols::initialize(CHECK);
322
323 SystemDictionary::initialize(CHECK);
324
325 Klass* ok = SystemDictionary::Object_klass();
326
327 _the_null_string = StringTable::intern("null", CHECK);
328 _the_min_jint_string = StringTable::intern("-2147483648", CHECK);
329
330 #if INCLUDE_CDS
331 if (UseSharedSpaces) {
332 // Verify shared interfaces array.
333 assert(_the_array_interfaces_array->at(0) ==
334 SystemDictionary::Cloneable_klass(), "u3");
335 assert(_the_array_interfaces_array->at(1) ==
336 SystemDictionary::Serializable_klass(), "u3");
337 } else
338 #endif
339 {
340 // Set up shared interfaces array. (Do this before supers are set up.)
341 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
342 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
343 }
344
345 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
346 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
347 initialize_basic_type_klass(floatArrayKlassObj(), CHECK);
348 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
349 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
350 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
351 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
352 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
353 } // end of core bootstrapping
354
355 {
356 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
357 _the_null_sentinel = tns();
358 }
359
360 // Maybe this could be lifted up now that object array can be initialized
361 // during the bootstrapping.
362
363 // OLD
364 // Initialize _objectArrayKlass after core bootstraping to make
365 // sure the super class is set up properly for _objectArrayKlass.
366 // ---
367 // NEW
368 // Since some of the old system object arrays have been converted to
369 // ordinary object arrays, _objectArrayKlass will be loaded when
370 // SystemDictionary::initialize(CHECK); is run. See the extra check
371 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
372 _objectArrayKlassObj = InstanceKlass::
373 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
374 // OLD
375 // Add the class to the class hierarchy manually to make sure that
376 // its vtable is initialized after core bootstrapping is completed.
377 // ---
378 // New
379 // Have already been initialized.
380 _objectArrayKlassObj->append_to_sibling_list();
381
382 #ifdef ASSERT
383 if (FullGCALot) {
384 // Allocate an array of dummy objects.
385 // We'd like these to be at the bottom of the old generation,
386 // so that when we free one and then collect,
387 // (almost) the whole heap moves
388 // and we find out if we actually update all the oops correctly.
389 // But we can't allocate directly in the old generation,
390 // so we allocate wherever, and hope that the first collection
391 // moves these objects to the bottom of the old generation.
392 // We can allocate directly in the permanent generation, so we do.
393 int size;
394 if (UseConcMarkSweepGC) {
395 log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate");
396 size = FullGCALotDummies;
397 } else {
398 size = FullGCALotDummies * 2;
399 }
400 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
401 objArrayHandle dummy_array(THREAD, naked_array);
402 int i = 0;
403 while (i < size) {
404 // Allocate dummy in old generation
405 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK);
406 dummy_array->obj_at_put(i++, dummy);
407 }
408 {
409 // Only modify the global variable inside the mutex.
410 // If we had a race to here, the other dummy_array instances
411 // and their elements just get dropped on the floor, which is fine.
412 MutexLocker ml(FullGCALot_lock);
413 if (_fullgc_alot_dummy_array == NULL) {
414 _fullgc_alot_dummy_array = dummy_array();
415 }
416 }
417 assert(i == _fullgc_alot_dummy_array->length(), "just checking");
418 }
419 #endif
420 }
421
422 void Universe::initialize_basic_type_mirrors(TRAPS) {
423 #if INCLUDE_CDS_JAVA_HEAP
424 if (UseSharedSpaces &&
425 MetaspaceShared::open_archive_heap_region_mapped() &&
426 _int_mirror != NULL) {
427 assert(MetaspaceShared::is_heap_object_archiving_allowed(), "Sanity");
428 assert(_float_mirror != NULL && _double_mirror != NULL &&
429 _byte_mirror != NULL && _byte_mirror != NULL &&
430 _bool_mirror != NULL && _char_mirror != NULL &&
431 _long_mirror != NULL && _short_mirror != NULL &&
432 _void_mirror != NULL, "Sanity");
433 } else
434 #endif
435 {
436 _int_mirror =
437 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK);
438 _float_mirror =
439 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK);
440 _double_mirror =
441 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK);
442 _byte_mirror =
443 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK);
444 _bool_mirror =
445 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
446 _char_mirror =
447 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK);
448 _long_mirror =
449 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK);
450 _short_mirror =
451 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK);
452 _void_mirror =
453 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK);
454 }
455
456 _mirrors[T_INT] = _int_mirror;
457 _mirrors[T_FLOAT] = _float_mirror;
458 _mirrors[T_DOUBLE] = _double_mirror;
459 _mirrors[T_BYTE] = _byte_mirror;
460 _mirrors[T_BOOLEAN] = _bool_mirror;
461 _mirrors[T_CHAR] = _char_mirror;
462 _mirrors[T_LONG] = _long_mirror;
463 _mirrors[T_SHORT] = _short_mirror;
464 _mirrors[T_VOID] = _void_mirror;
465 //_mirrors[T_OBJECT] = _object_klass->java_mirror();
466 //_mirrors[T_ARRAY] = _object_klass->java_mirror();
467 }
468
469 void Universe::fixup_mirrors(TRAPS) {
470 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
471 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
472 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
473 // that the number of objects allocated at this point is very small.
474 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
475 HandleMark hm(THREAD);
476
477 if (!UseSharedSpaces) {
478 // Cache the start of the static fields
479 InstanceMirrorKlass::init_offset_of_static_fields();
480 }
481
482 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
483 int list_length = list->length();
484 for (int i = 0; i < list_length; i++) {
485 Klass* k = list->at(i);
486 assert(k->is_klass(), "List should only hold classes");
487 EXCEPTION_MARK;
488 java_lang_Class::fixup_mirror(k, CATCH);
489 }
490 delete java_lang_Class::fixup_mirror_list();
491 java_lang_Class::set_fixup_mirror_list(NULL);
492 }
493
494 #define assert_pll_locked(test) \
495 assert(Heap_lock->test(), "Reference pending list access requires lock")
496
497 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
498
499 oop Universe::reference_pending_list() {
500 if (Thread::current()->is_VM_thread()) {
501 assert_pll_locked(is_locked);
502 } else {
503 assert_pll_ownership();
504 }
505 return _reference_pending_list;
506 }
507
508 void Universe::set_reference_pending_list(oop list) {
509 assert_pll_ownership();
510 _reference_pending_list = list;
511 }
512
513 bool Universe::has_reference_pending_list() {
514 assert_pll_ownership();
515 return _reference_pending_list != NULL;
516 }
517
518 oop Universe::swap_reference_pending_list(oop list) {
519 assert_pll_locked(is_locked);
520 return Atomic::xchg(list, &_reference_pending_list);
521 }
522
523 #undef assert_pll_locked
524 #undef assert_pll_ownership
525
526 // initialize_vtable could cause gc if
527 // 1) we specified true to initialize_vtable and
528 // 2) this ran after gc was enabled
529 // In case those ever change we use handles for oops
530 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) {
531 // init vtable of k and all subclasses
532 ko->vtable().initialize_vtable(false, CHECK);
533 if (ko->is_instance_klass()) {
534 for (Klass* sk = ko->subklass();
535 sk != NULL;
536 sk = sk->next_sibling()) {
537 reinitialize_vtable_of(sk, CHECK);
538 }
539 }
540 }
541
542
543 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) {
544 k->itable().initialize_itable(false, CHECK);
545 }
546
547
548 void Universe::reinitialize_itables(TRAPS) {
549 MutexLocker mcld(ClassLoaderDataGraph_lock);
550 ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK);
551 }
552
553
554 bool Universe::on_page_boundary(void* addr) {
555 return is_aligned(addr, os::vm_page_size());
556 }
557
558
559 bool Universe::should_fill_in_stack_trace(Handle throwable) {
560 // never attempt to fill in the stack trace of preallocated errors that do not have
561 // backtrace. These errors are kept alive forever and may be "re-used" when all
562 // preallocated errors with backtrace have been consumed. Also need to avoid
563 // a potential loop which could happen if an out of memory occurs when attempting
564 // to allocate the backtrace.
565 return ((!oopDesc::equals(throwable(), Universe::_out_of_memory_error_java_heap)) &&
566 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_metaspace)) &&
567 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_class_metaspace)) &&
568 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_array_size)) &&
569 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_gc_overhead_limit)) &&
570 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_realloc_objects)) &&
571 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_retry)));
572 }
573
574
575 oop Universe::gen_out_of_memory_error(oop default_err) {
576 // generate an out of memory error:
577 // - if there is a preallocated error and stack traces are available
578 // (j.l.Throwable is initialized), then return the preallocated
579 // error with a filled in stack trace, and with the message
580 // provided by the default error.
581 // - otherwise, return the default error, without a stack trace.
582 int next;
583 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
584 SystemDictionary::Throwable_klass()->is_initialized()) {
585 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);
586 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
587 } else {
588 next = -1;
589 }
590 if (next < 0) {
591 // all preallocated errors have been used.
592 // return default
593 return default_err;
594 } else {
595 Thread* THREAD = Thread::current();
596 Handle default_err_h(THREAD, default_err);
597 // get the error object at the slot and set set it to NULL so that the
598 // array isn't keeping it alive anymore.
599 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next));
600 assert(exc() != NULL, "slot has been used already");
601 preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
602
603 // use the message from the default error
604 oop msg = java_lang_Throwable::message(default_err_h());
605 assert(msg != NULL, "no message");
606 java_lang_Throwable::set_message(exc(), msg);
607
608 // populate the stack trace and return it.
609 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
610 return exc();
611 }
612 }
613
614 intptr_t Universe::_non_oop_bits = 0;
615
616 void* Universe::non_oop_word() {
617 // Neither the high bits nor the low bits of this value is allowed
618 // to look like (respectively) the high or low bits of a real oop.
619 //
620 // High and low are CPU-specific notions, but low always includes
621 // the low-order bit. Since oops are always aligned at least mod 4,
622 // setting the low-order bit will ensure that the low half of the
623 // word will never look like that of a real oop.
624 //
625 // Using the OS-supplied non-memory-address word (usually 0 or -1)
626 // will take care of the high bits, however many there are.
627
628 if (_non_oop_bits == 0) {
629 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
630 }
631
632 return (void*)_non_oop_bits;
633 }
634
635 jint universe_init() {
636 assert(!Universe::_fully_initialized, "called after initialize_vtables");
637 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
638 "LogHeapWordSize is incorrect.");
639 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
640 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
641 "oop size is not not a multiple of HeapWord size");
642
643 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
644
645 JavaClasses::compute_hard_coded_offsets();
646
647 jint status = Universe::initialize_heap();
648 if (status != JNI_OK) {
649 return status;
650 }
651
652 SystemDictionary::initialize_oop_storage();
653
654 Metaspace::global_initialize();
655
656 // Initialize performance counters for metaspaces
657 MetaspaceCounters::initialize_performance_counters();
658 CompressedClassSpaceCounters::initialize_performance_counters();
659
660 AOTLoader::universe_init();
661
662 // Checks 'AfterMemoryInit' constraints.
663 if (!JVMFlagConstraintList::check_constraints(JVMFlagConstraint::AfterMemoryInit)) {
664 return JNI_EINVAL;
665 }
666
667 // Create memory for metadata. Must be after initializing heap for
668 // DumpSharedSpaces.
669 ClassLoaderData::init_null_class_loader_data();
670
671 // We have a heap so create the Method* caches before
672 // Metaspace::initialize_shared_spaces() tries to populate them.
673 Universe::_finalizer_register_cache = new LatestMethodCache();
674 Universe::_loader_addClass_cache = new LatestMethodCache();
675 Universe::_pd_implies_cache = new LatestMethodCache();
676 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
677 Universe::_do_stack_walk_cache = new LatestMethodCache();
678
679 #if INCLUDE_CDS
680 if (UseSharedSpaces) {
681 // Read the data structures supporting the shared spaces (shared
682 // system dictionary, symbol table, etc.). After that, access to
683 // the file (other than the mapped regions) is no longer needed, and
684 // the file is closed. Closing the file does not affect the
685 // currently mapped regions.
686 MetaspaceShared::initialize_shared_spaces();
687 StringTable::create_table();
688 } else
689 #endif
690 {
691 SymbolTable::create_table();
692 StringTable::create_table();
693
694 #if INCLUDE_CDS
695 if (DumpSharedSpaces) {
696 MetaspaceShared::prepare_for_dumping();
697 }
698 #endif
699 }
700 if (strlen(VerifySubSet) > 0) {
701 Universe::initialize_verify_flags();
702 }
703
704 ResolvedMethodTable::create_table();
705
706 return JNI_OK;
707 }
708
709 CollectedHeap* Universe::create_heap() {
710 assert(_collectedHeap == NULL, "Heap already created");
711 return GCConfig::arguments()->create_heap();
712 }
713
714 // Choose the heap base address and oop encoding mode
715 // when compressed oops are used:
716 // Unscaled - Use 32-bits oops without encoding when
717 // NarrowOopHeapBaseMin + heap_size < 4Gb
718 // ZeroBased - Use zero based compressed oops with encoding when
719 // NarrowOopHeapBaseMin + heap_size < 32Gb
720 // HeapBased - Use compressed oops with heap base + encoding.
721
722 jint Universe::initialize_heap() {
723 _collectedHeap = create_heap();
724 jint status = _collectedHeap->initialize();
725 if (status != JNI_OK) {
726 return status;
727 }
728 log_info(gc)("Using %s", _collectedHeap->name());
729
730 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
731
732 #ifdef _LP64
733 if (UseCompressedOops) {
734 // Subtract a page because something can get allocated at heap base.
735 // This also makes implicit null checking work, because the
736 // memory+1 page below heap_base needs to cause a signal.
737 // See needs_explicit_null_check.
738 // Only set the heap base for compressed oops because it indicates
739 // compressed oops for pstack code.
740 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) {
741 // Didn't reserve heap below 4Gb. Must shift.
742 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
743 }
744 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) {
745 // Did reserve heap below 32Gb. Can use base == 0;
746 Universe::set_narrow_oop_base(0);
747 }
748 AOTLoader::set_narrow_oop_shift();
749
750 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base());
751
752 LogTarget(Info, gc, heap, coops) lt;
753 if (lt.is_enabled()) {
754 ResourceMark rm;
755 LogStream ls(lt);
756 Universe::print_compressed_oops_mode(&ls);
757 }
758
759 // Tell tests in which mode we run.
760 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode",
761 narrow_oop_mode_to_string(narrow_oop_mode()),
762 false));
763 }
764 // Universe::narrow_oop_base() is one page below the heap.
765 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() -
766 os::vm_page_size()) ||
767 Universe::narrow_oop_base() == NULL, "invalid value");
768 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes ||
769 Universe::narrow_oop_shift() == 0, "invalid value");
770 #endif
771
772 // We will never reach the CATCH below since Exceptions::_throw will cause
773 // the VM to exit if an exception is thrown during initialization
774
775 if (UseTLAB) {
776 assert(Universe::heap()->supports_tlab_allocation(),
777 "Should support thread-local allocation buffers");
778 ThreadLocalAllocBuffer::startup_initialization();
779 }
780 return JNI_OK;
781 }
782
783 void Universe::print_compressed_oops_mode(outputStream* st) {
784 st->print("Heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
785 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M);
786
787 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode()));
788
789 if (Universe::narrow_oop_base() != 0) {
790 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base()));
791 }
792
793 if (Universe::narrow_oop_shift() != 0) {
794 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
795 }
796
797 if (!Universe::narrow_oop_use_implicit_null_checks()) {
798 st->print(", no protected page in front of the heap");
799 }
800 st->cr();
801 }
802
803 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
804
805 assert(alignment <= Arguments::conservative_max_heap_alignment(),
806 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
807 alignment, Arguments::conservative_max_heap_alignment());
808
809 size_t total_reserved = align_up(heap_size, alignment);
810 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
811 "heap size is too big for compressed oops");
812
813 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size());
814 assert(!UseLargePages
815 || UseParallelGC
816 || use_large_pages, "Wrong alignment to use large pages");
817
818 // Now create the space.
819 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt);
820
821 if (total_rs.is_reserved()) {
822 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
823 "must be exactly of required size and alignment");
824 // We are good.
825
826 if (UseCompressedOops) {
827 // Universe::initialize_heap() will reset this to NULL if unscaled
828 // or zero-based narrow oops are actually used.
829 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
830 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
831 }
832
833 if (AllocateHeapAt != NULL) {
834 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
835 }
836 return total_rs;
837 }
838
839 vm_exit_during_initialization(
840 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
841 total_reserved/K));
842
843 // satisfy compiler
844 ShouldNotReachHere();
845 return ReservedHeapSpace(0, 0, false);
846 }
847
848
849 // It's the caller's responsibility to ensure glitch-freedom
850 // (if required).
851 void Universe::update_heap_info_at_gc() {
852 _heap_capacity_at_last_gc = heap()->capacity();
853 _heap_used_at_last_gc = heap()->used();
854 }
855
856
857 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) {
858 switch (mode) {
859 case UnscaledNarrowOop:
860 return "32-bit";
861 case ZeroBasedNarrowOop:
862 return "Zero based";
863 case DisjointBaseNarrowOop:
864 return "Non-zero disjoint base";
865 case HeapBasedNarrowOop:
866 return "Non-zero based";
867 default:
868 ShouldNotReachHere();
869 return "";
870 }
871 }
872
873
874 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() {
875 if (narrow_oop_base_disjoint()) {
876 return DisjointBaseNarrowOop;
877 }
878
879 if (narrow_oop_base() != 0) {
880 return HeapBasedNarrowOop;
881 }
882
883 if (narrow_oop_shift() != 0) {
884 return ZeroBasedNarrowOop;
885 }
886
887 return UnscaledNarrowOop;
888 }
889
890 void initialize_known_method(LatestMethodCache* method_cache,
891 InstanceKlass* ik,
892 const char* method,
893 Symbol* signature,
894 bool is_static, TRAPS)
895 {
896 TempNewSymbol name = SymbolTable::new_symbol(method, CHECK);
897 Method* m = NULL;
898 // The klass must be linked before looking up the method.
899 if (!ik->link_class_or_fail(THREAD) ||
900 ((m = ik->find_method(name, signature)) == NULL) ||
901 is_static != m->is_static()) {
902 ResourceMark rm(THREAD);
903 // NoSuchMethodException doesn't actually work because it tries to run the
904 // <init> function before java_lang_Class is linked. Print error and exit.
905 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
906 ik->name()->as_C_string(), method));
907 }
908 method_cache->init(ik, m);
909 }
910
911 void Universe::initialize_known_methods(TRAPS) {
912 // Set up static method for registering finalizers
913 initialize_known_method(_finalizer_register_cache,
914 SystemDictionary::Finalizer_klass(),
915 "register",
916 vmSymbols::object_void_signature(), true, CHECK);
917
918 initialize_known_method(_throw_illegal_access_error_cache,
919 SystemDictionary::internal_Unsafe_klass(),
920 "throwIllegalAccessError",
921 vmSymbols::void_method_signature(), true, CHECK);
922
923 // Set up method for registering loaded classes in class loader vector
924 initialize_known_method(_loader_addClass_cache,
925 SystemDictionary::ClassLoader_klass(),
926 "addClass",
927 vmSymbols::class_void_signature(), false, CHECK);
928
929 // Set up method for checking protection domain
930 initialize_known_method(_pd_implies_cache,
931 SystemDictionary::ProtectionDomain_klass(),
932 "impliesCreateAccessControlContext",
933 vmSymbols::void_boolean_signature(), false, CHECK);
934
935 // Set up method for stack walking
936 initialize_known_method(_do_stack_walk_cache,
937 SystemDictionary::AbstractStackWalker_klass(),
938 "doStackWalk",
939 vmSymbols::doStackWalk_signature(), false, CHECK);
940 }
941
942 void universe2_init() {
943 EXCEPTION_MARK;
944 Universe::genesis(CATCH);
945 }
946
947 // Set after initialization of the module runtime, call_initModuleRuntime
948 void universe_post_module_init() {
949 Universe::_module_initialized = true;
950 }
951
952 bool universe_post_init() {
953 assert(!is_init_completed(), "Error: initialization not yet completed!");
954 Universe::_fully_initialized = true;
955 EXCEPTION_MARK;
956 { ResourceMark rm;
957 Interpreter::initialize(); // needed for interpreter entry points
958 if (!UseSharedSpaces) {
959 HandleMark hm(THREAD);
960 Klass* ok = SystemDictionary::Object_klass();
961 Universe::reinitialize_vtable_of(ok, CHECK_false);
962 Universe::reinitialize_itables(CHECK_false);
963 }
964 }
965
966 HandleMark hm(THREAD);
967 // Setup preallocated empty java.lang.Class array
968 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
969
970 // Setup preallocated OutOfMemoryError errors
971 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
972 InstanceKlass* ik = InstanceKlass::cast(k);
973 Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false);
974 Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false);
975 Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false);
976 Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false);
977 Universe::_out_of_memory_error_gc_overhead_limit =
978 ik->allocate_instance(CHECK_false);
979 Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false);
980 Universe::_out_of_memory_error_retry = ik->allocate_instance(CHECK_false);
981
982 // Setup preallocated cause message for delayed StackOverflowError
983 if (StackReservedPages > 0) {
984 Universe::_delayed_stack_overflow_error_message =
985 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
986 }
987
988 // Setup preallocated NullPointerException
989 // (this is currently used for a cheap & dirty solution in compiler exception handling)
990 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
991 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
992 // Setup preallocated ArithmeticException
993 // (this is currently used for a cheap & dirty solution in compiler exception handling)
994 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
995 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
996 // Virtual Machine Error for when we get into a situation we can't resolve
997 k = SystemDictionary::resolve_or_fail(
998 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
999 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1000 if (!linked) {
1001 tty->print_cr("Unable to link/verify VirtualMachineError class");
1002 return false; // initialization failed
1003 }
1004 Universe::_virtual_machine_error_instance =
1005 InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1006
1007 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1008
1009 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
1010 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
1011
1012 msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
1013 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
1014 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
1015 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
1016
1017 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
1018 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
1019
1020 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
1021 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
1022
1023 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false);
1024 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg());
1025
1026 msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK_false);
1027 java_lang_Throwable::set_message(Universe::_out_of_memory_error_retry, msg());
1028
1029 msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1030 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
1031
1032 // Setup the array of errors that have preallocated backtrace
1033 k = Universe::_out_of_memory_error_java_heap->klass();
1034 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
1035 ik = InstanceKlass::cast(k);
1036
1037 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
1038 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false);
1039 for (int i=0; i<len; i++) {
1040 oop err = ik->allocate_instance(CHECK_false);
1041 Handle err_h = Handle(THREAD, err);
1042 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
1043 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
1044 }
1045 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
1046
1047 Universe::initialize_known_methods(CHECK_false);
1048
1049 // This needs to be done before the first scavenge/gc, since
1050 // it's an input to soft ref clearing policy.
1051 {
1052 MutexLocker x(Heap_lock);
1053 Universe::update_heap_info_at_gc();
1054 }
1055
1056 // ("weak") refs processing infrastructure initialization
1057 Universe::heap()->post_initialize();
1058
1059 MemoryService::add_metaspace_memory_pools();
1060
1061 MemoryService::set_universe_heap(Universe::heap());
1062 #if INCLUDE_CDS
1063 MetaspaceShared::post_initialize(CHECK_false);
1064 #endif
1065 return true;
1066 }
1067
1068
1069 void Universe::compute_base_vtable_size() {
1070 _base_vtable_size = ClassLoader::compute_Object_vtable();
1071 }
1072
1073 void Universe::print_on(outputStream* st) {
1074 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1075 st->print_cr("Heap");
1076 heap()->print_on(st);
1077 }
1078
1079 void Universe::print_heap_at_SIGBREAK() {
1080 if (PrintHeapAtSIGBREAK) {
1081 print_on(tty);
1082 tty->cr();
1083 tty->flush();
1084 }
1085 }
1086
1087 void Universe::print_heap_before_gc() {
1088 LogTarget(Debug, gc, heap) lt;
1089 if (lt.is_enabled()) {
1090 LogStream ls(lt);
1091 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1092 ResourceMark rm;
1093 heap()->print_on(&ls);
1094 }
1095 }
1096
1097 void Universe::print_heap_after_gc() {
1098 LogTarget(Debug, gc, heap) lt;
1099 if (lt.is_enabled()) {
1100 LogStream ls(lt);
1101 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1102 ResourceMark rm;
1103 heap()->print_on(&ls);
1104 }
1105 }
1106
1107 void Universe::initialize_verify_flags() {
1108 verify_flags = 0;
1109 const char delimiter[] = " ,";
1110
1111 size_t length = strlen(VerifySubSet);
1112 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1113 strncpy(subset_list, VerifySubSet, length + 1);
1114
1115 char* token = strtok(subset_list, delimiter);
1116 while (token != NULL) {
1117 if (strcmp(token, "threads") == 0) {
1118 verify_flags |= Verify_Threads;
1119 } else if (strcmp(token, "heap") == 0) {
1120 verify_flags |= Verify_Heap;
1121 } else if (strcmp(token, "symbol_table") == 0) {
1122 verify_flags |= Verify_SymbolTable;
1123 } else if (strcmp(token, "string_table") == 0) {
1124 verify_flags |= Verify_StringTable;
1125 } else if (strcmp(token, "codecache") == 0) {
1126 verify_flags |= Verify_CodeCache;
1127 } else if (strcmp(token, "dictionary") == 0) {
1128 verify_flags |= Verify_SystemDictionary;
1129 } else if (strcmp(token, "classloader_data_graph") == 0) {
1130 verify_flags |= Verify_ClassLoaderDataGraph;
1131 } else if (strcmp(token, "metaspace") == 0) {
1132 verify_flags |= Verify_MetaspaceUtils;
1133 } else if (strcmp(token, "jni_handles") == 0) {
1134 verify_flags |= Verify_JNIHandles;
1135 } else if (strcmp(token, "codecache_oops") == 0) {
1136 verify_flags |= Verify_CodeCacheOops;
1137 } else {
1138 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1139 }
1140 token = strtok(NULL, delimiter);
1141 }
1142 FREE_C_HEAP_ARRAY(char, subset_list);
1143 }
1144
1145 bool Universe::should_verify_subset(uint subset) {
1146 if (verify_flags & subset) {
1147 return true;
1148 }
1149 return false;
1150 }
1151
1152 void Universe::verify(VerifyOption option, const char* prefix) {
1153 // The use of _verify_in_progress is a temporary work around for
1154 // 6320749. Don't bother with a creating a class to set and clear
1155 // it since it is only used in this method and the control flow is
1156 // straight forward.
1157 _verify_in_progress = true;
1158
1159 COMPILER2_PRESENT(
1160 assert(!DerivedPointerTable::is_active(),
1161 "DPT should not be active during verification "
1162 "(of thread stacks below)");
1163 )
1164
1165 ResourceMark rm;
1166 HandleMark hm; // Handles created during verification can be zapped
1167 _verify_count++;
1168
1169 FormatBuffer<> title("Verifying %s", prefix);
1170 GCTraceTime(Info, gc, verify) tm(title.buffer());
1171 if (should_verify_subset(Verify_Threads)) {
1172 log_debug(gc, verify)("Threads");
1173 Threads::verify();
1174 }
1175 if (should_verify_subset(Verify_Heap)) {
1176 log_debug(gc, verify)("Heap");
1177 heap()->verify(option);
1178 }
1179 if (should_verify_subset(Verify_SymbolTable)) {
1180 log_debug(gc, verify)("SymbolTable");
1181 SymbolTable::verify();
1182 }
1183 if (should_verify_subset(Verify_StringTable)) {
1184 log_debug(gc, verify)("StringTable");
1185 StringTable::verify();
1186 }
1187 if (should_verify_subset(Verify_CodeCache)) {
1188 {
1189 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1190 log_debug(gc, verify)("CodeCache");
1191 CodeCache::verify();
1192 }
1193 }
1194 if (should_verify_subset(Verify_SystemDictionary)) {
1195 log_debug(gc, verify)("SystemDictionary");
1196 SystemDictionary::verify();
1197 }
1198 #ifndef PRODUCT
1199 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1200 log_debug(gc, verify)("ClassLoaderDataGraph");
1201 ClassLoaderDataGraph::verify();
1202 }
1203 #endif
1204 if (should_verify_subset(Verify_MetaspaceUtils)) {
1205 log_debug(gc, verify)("MetaspaceUtils");
1206 MetaspaceUtils::verify_free_chunks();
1207 }
1208 if (should_verify_subset(Verify_JNIHandles)) {
1209 log_debug(gc, verify)("JNIHandles");
1210 JNIHandles::verify();
1211 }
1212 if (should_verify_subset(Verify_CodeCacheOops)) {
1213 log_debug(gc, verify)("CodeCache Oops");
1214 CodeCache::verify_oops();
1215 }
1216
1217 _verify_in_progress = false;
1218 }
1219
1220
1221 #ifndef PRODUCT
1222 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1223 assert(low_boundary < high_boundary, "bad interval");
1224
1225 // decide which low-order bits we require to be clear:
1226 size_t alignSize = MinObjAlignmentInBytes;
1227 size_t min_object_size = CollectedHeap::min_fill_size();
1228
1229 // make an inclusive limit:
1230 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1231 uintptr_t min = (uintptr_t)low_boundary;
1232 assert(min < max, "bad interval");
1233 uintptr_t diff = max ^ min;
1234
1235 // throw away enough low-order bits to make the diff vanish
1236 uintptr_t mask = (uintptr_t)(-1);
1237 while ((mask & diff) != 0)
1238 mask <<= 1;
1239 uintptr_t bits = (min & mask);
1240 assert(bits == (max & mask), "correct mask");
1241 // check an intermediate value between min and max, just to make sure:
1242 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1243
1244 // require address alignment, too:
1245 mask |= (alignSize - 1);
1246
1247 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1248 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1249 }
1250 _verify_oop_mask = mask;
1251 _verify_oop_bits = bits;
1252 }
1253
1254 // Oop verification (see MacroAssembler::verify_oop)
1255
1256 uintptr_t Universe::verify_oop_mask() {
1257 MemRegion m = heap()->reserved_region();
1258 calculate_verify_data(m.start(), m.end());
1259 return _verify_oop_mask;
1260 }
1261
1262 uintptr_t Universe::verify_oop_bits() {
1263 MemRegion m = heap()->reserved_region();
1264 calculate_verify_data(m.start(), m.end());
1265 return _verify_oop_bits;
1266 }
1267
1268 uintptr_t Universe::verify_mark_mask() {
1269 return markOopDesc::lock_mask_in_place;
1270 }
1271
1272 uintptr_t Universe::verify_mark_bits() {
1273 intptr_t mask = verify_mark_mask();
1274 intptr_t bits = (intptr_t)markOopDesc::prototype();
1275 assert((bits & ~mask) == 0, "no stray header bits");
1276 return bits;
1277 }
1278 #endif // PRODUCT
1279
1280
1281 void Universe::compute_verify_oop_data() {
1282 verify_oop_mask();
1283 verify_oop_bits();
1284 verify_mark_mask();
1285 verify_mark_bits();
1286 }
1287
1288
1289 void LatestMethodCache::init(Klass* k, Method* m) {
1290 if (!UseSharedSpaces) {
1291 _klass = k;
1292 }
1293 #ifndef PRODUCT
1294 else {
1295 // sharing initilization should have already set up _klass
1296 assert(_klass != NULL, "just checking");
1297 }
1298 #endif
1299
1300 _method_idnum = m->method_idnum();
1301 assert(_method_idnum >= 0, "sanity check");
1302 }
1303
1304
1305 Method* LatestMethodCache::get_method() {
1306 if (klass() == NULL) return NULL;
1307 InstanceKlass* ik = InstanceKlass::cast(klass());
1308 Method* m = ik->method_with_idnum(method_idnum());
1309 assert(m != NULL, "sanity check");
1310 return m;
1311 }
1312
1313
1314 #ifdef ASSERT
1315 // Release dummy object(s) at bottom of heap
1316 bool Universe::release_fullgc_alot_dummy() {
1317 MutexLocker ml(FullGCALot_lock);
1318 if (_fullgc_alot_dummy_array != NULL) {
1319 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
1320 // No more dummies to release, release entire array instead
1321 _fullgc_alot_dummy_array = NULL;
1322 return false;
1323 }
1324 if (!UseConcMarkSweepGC) {
1325 // Release dummy at bottom of old generation
1326 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1327 }
1328 // Release dummy at bottom of permanent generation
1329 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1330 }
1331 return true;
1332 }
1333
1334 #endif // ASSERT