1 /*
2 * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "aot/aotLoader.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/classLoaderDataGraph.hpp"
29 #include "classfile/javaClasses.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/symbolTable.hpp"
32 #include "classfile/systemDictionary.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "code/codeBehaviours.hpp"
35 #include "code/codeCache.hpp"
36 #include "code/dependencies.hpp"
37 #include "gc/shared/collectedHeap.inline.hpp"
38 #include "gc/shared/gcArguments.hpp"
39 #include "gc/shared/gcConfig.hpp"
40 #include "gc/shared/gcTraceTime.inline.hpp"
41 #include "interpreter/interpreter.hpp"
42 #include "logging/log.hpp"
43 #include "logging/logStream.hpp"
44 #include "memory/heapShared.hpp"
45 #include "memory/filemap.hpp"
46 #include "memory/metadataFactory.hpp"
47 #include "memory/metaspaceClosure.hpp"
48 #include "memory/metaspaceCounters.hpp"
49 #include "memory/metaspaceShared.hpp"
50 #include "memory/oopFactory.hpp"
51 #include "memory/resourceArea.hpp"
52 #include "memory/universe.hpp"
53 #include "oops/compressedOops.hpp"
54 #include "oops/constantPool.hpp"
55 #include "oops/instanceClassLoaderKlass.hpp"
56 #include "oops/instanceKlass.hpp"
57 #include "oops/instanceMirrorKlass.hpp"
58 #include "oops/instanceRefKlass.hpp"
59 #include "oops/objArrayOop.inline.hpp"
60 #include "oops/oop.inline.hpp"
61 #include "oops/typeArrayKlass.hpp"
62 #include "prims/resolvedMethodTable.hpp"
63 #include "runtime/arguments.hpp"
64 #include "runtime/atomic.hpp"
65 #include "runtime/deoptimization.hpp"
66 #include "runtime/flags/flagSetting.hpp"
67 #include "runtime/flags/jvmFlagConstraintList.hpp"
68 #include "runtime/handles.inline.hpp"
69 #include "runtime/init.hpp"
70 #include "runtime/java.hpp"
71 #include "runtime/javaCalls.hpp"
72 #include "runtime/sharedRuntime.hpp"
73 #include "runtime/synchronizer.hpp"
74 #include "runtime/thread.inline.hpp"
75 #include "runtime/timerTrace.hpp"
76 #include "runtime/vmOperations.hpp"
77 #include "services/memoryService.hpp"
78 #include "utilities/align.hpp"
79 #include "utilities/copy.hpp"
80 #include "utilities/debug.hpp"
81 #include "utilities/events.hpp"
82 #include "utilities/formatBuffer.hpp"
83 #include "utilities/hashtable.inline.hpp"
84 #include "utilities/macros.hpp"
85 #include "utilities/ostream.hpp"
86 #include "utilities/preserveException.hpp"
87
88 #define PRIMITIVE_MIRRORS_DO(func) \
89 func(_int_mirror) \
90 func(_float_mirror) \
91 func(_double_mirror) \
92 func(_byte_mirror) \
93 func(_bool_mirror) \
94 func(_char_mirror) \
95 func(_long_mirror) \
96 func(_short_mirror) \
97 func(_void_mirror)
98
99 #define DEFINE_PRIMITIVE_MIRROR(m) \
100 oop Universe::m = NULL;
101
102 // Known objects
103 PRIMITIVE_MIRRORS_DO(DEFINE_PRIMITIVE_MIRROR)
104 Klass* Universe::_typeArrayKlassObjs[T_LONG+1] = { NULL /*, NULL...*/ };
105 Klass* Universe::_objectArrayKlassObj = NULL;
106 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ };
107 oop Universe::_main_thread_group = NULL;
108 oop Universe::_system_thread_group = NULL;
109 objArrayOop Universe::_the_empty_class_klass_array = NULL;
110 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
111 oop Universe::_the_null_sentinel = NULL;
112 oop Universe::_the_null_string = NULL;
113 oop Universe::_the_min_jint_string = NULL;
114 LatestMethodCache* Universe::_finalizer_register_cache = NULL;
115 LatestMethodCache* Universe::_loader_addClass_cache = NULL;
116 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL;
117 LatestMethodCache* Universe::_throw_no_such_method_error_cache = NULL;
118 LatestMethodCache* Universe::_do_stack_walk_cache = NULL;
119 oop Universe::_out_of_memory_error_java_heap = NULL;
120 oop Universe::_out_of_memory_error_metaspace = NULL;
121 oop Universe::_out_of_memory_error_class_metaspace = NULL;
122 oop Universe::_out_of_memory_error_array_size = NULL;
123 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL;
124 oop Universe::_out_of_memory_error_realloc_objects = NULL;
125 oop Universe::_out_of_memory_error_retry = NULL;
126 oop Universe::_delayed_stack_overflow_error_message = NULL;
127 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL;
128 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
129 bool Universe::_verify_in_progress = false;
130 long Universe::verify_flags = Universe::Verify_All;
131 oop Universe::_null_ptr_exception_instance = NULL;
132 oop Universe::_arithmetic_exception_instance = NULL;
133 oop Universe::_virtual_machine_error_instance = NULL;
134 oop Universe::_vm_exception = NULL;
135 oop Universe::_reference_pending_list = NULL;
136
137 Array<int>* Universe::_the_empty_int_array = NULL;
138 Array<u2>* Universe::_the_empty_short_array = NULL;
139 Array<Klass*>* Universe::_the_empty_klass_array = NULL;
140 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = NULL;
141 Array<Method*>* Universe::_the_empty_method_array = NULL;
142
143 // These variables are guarded by FullGCALot_lock.
144 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;)
145 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
146
147 // Heap
148 int Universe::_verify_count = 0;
149
150 // Oop verification (see MacroAssembler::verify_oop)
151 uintptr_t Universe::_verify_oop_mask = 0;
152 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
153
154 int Universe::_base_vtable_size = 0;
155 bool Universe::_bootstrapping = false;
156 bool Universe::_module_initialized = false;
157 bool Universe::_fully_initialized = false;
158
159 size_t Universe::_heap_capacity_at_last_gc;
160 size_t Universe::_heap_used_at_last_gc = 0;
161
162 CollectedHeap* Universe::_collectedHeap = NULL;
163
164 void Universe::basic_type_classes_do(void f(Klass*)) {
165 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
166 f(_typeArrayKlassObjs[i]);
167 }
168 }
169
170 void Universe::basic_type_classes_do(KlassClosure *closure) {
171 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
172 closure->do_klass(_typeArrayKlassObjs[i]);
173 }
174 }
175
176 #define DO_PRIMITIVE_MIRROR(m) \
177 f->do_oop((oop*) &m);
178
179 void Universe::oops_do(OopClosure* f) {
180 PRIMITIVE_MIRRORS_DO(DO_PRIMITIVE_MIRROR);
181
182 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
183 f->do_oop((oop*) &_mirrors[i]);
184 }
185 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
186
187 f->do_oop((oop*)&_the_empty_class_klass_array);
188 f->do_oop((oop*)&_the_null_sentinel);
189 f->do_oop((oop*)&_the_null_string);
190 f->do_oop((oop*)&_the_min_jint_string);
191 f->do_oop((oop*)&_out_of_memory_error_java_heap);
192 f->do_oop((oop*)&_out_of_memory_error_metaspace);
193 f->do_oop((oop*)&_out_of_memory_error_class_metaspace);
194 f->do_oop((oop*)&_out_of_memory_error_array_size);
195 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit);
196 f->do_oop((oop*)&_out_of_memory_error_realloc_objects);
197 f->do_oop((oop*)&_out_of_memory_error_retry);
198 f->do_oop((oop*)&_delayed_stack_overflow_error_message);
199 f->do_oop((oop*)&_preallocated_out_of_memory_error_array);
200 f->do_oop((oop*)&_null_ptr_exception_instance);
201 f->do_oop((oop*)&_arithmetic_exception_instance);
202 f->do_oop((oop*)&_virtual_machine_error_instance);
203 f->do_oop((oop*)&_main_thread_group);
204 f->do_oop((oop*)&_system_thread_group);
205 f->do_oop((oop*)&_vm_exception);
206 f->do_oop((oop*)&_reference_pending_list);
207 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);)
208 ThreadsSMRSupport::exiting_threads_oops_do(f);
209 }
210
211 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
212 it->push(&_klass);
213 }
214
215 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
216 for (int i = 0; i < T_LONG+1; i++) {
217 it->push(&_typeArrayKlassObjs[i]);
218 }
219 it->push(&_objectArrayKlassObj);
220
221 it->push(&_the_empty_int_array);
222 it->push(&_the_empty_short_array);
223 it->push(&_the_empty_klass_array);
224 it->push(&_the_empty_instance_klass_array);
225 it->push(&_the_empty_method_array);
226 it->push(&_the_array_interfaces_array);
227
228 _finalizer_register_cache->metaspace_pointers_do(it);
229 _loader_addClass_cache->metaspace_pointers_do(it);
230 _throw_illegal_access_error_cache->metaspace_pointers_do(it);
231 _throw_no_such_method_error_cache->metaspace_pointers_do(it);
232 _do_stack_walk_cache->metaspace_pointers_do(it);
233 }
234
235 #define ASSERT_MIRROR_NULL(m) \
236 assert(m == NULL, "archived mirrors should be NULL");
237
238 #define SERIALIZE_MIRROR(m) \
239 f->do_oop(&m); \
240 if (m != NULL) { java_lang_Class::update_archived_primitive_mirror_native_pointers(m); }
241
242 // Serialize metadata and pointers to primitive type mirrors in and out of CDS archive
243 void Universe::serialize(SerializeClosure* f) {
244
245 for (int i = 0; i < T_LONG+1; i++) {
246 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
247 }
248
249 f->do_ptr((void**)&_objectArrayKlassObj);
250
251 #if INCLUDE_CDS_JAVA_HEAP
252 DEBUG_ONLY(if (DumpSharedSpaces && !HeapShared::is_heap_object_archiving_allowed()) {
253 PRIMITIVE_MIRRORS_DO(ASSERT_MIRROR_NULL);
254 });
255 PRIMITIVE_MIRRORS_DO(SERIALIZE_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 _throw_illegal_access_error_cache->serialize(f);
267 _throw_no_such_method_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 if (k->is_instance_klass()) {
285 InstanceKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), NULL, CHECK);
286 } else {
287 ArrayKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), CHECK);
288 }
289 } else
290 #endif
291 {
292 k->initialize_supers(ok, NULL, CHECK);
293 }
294 k->append_to_sibling_list();
295 }
296
297 void Universe::genesis(TRAPS) {
298 ResourceMark rm(THREAD);
299
300 { FlagSetting fs(_bootstrapping, true);
301
302 { MutexLocker mc(THREAD, Compile_lock);
303
304 java_lang_Class::allocate_fixup_lists();
305
306 // determine base vtable size; without that we cannot create the array klasses
307 compute_base_vtable_size();
308
309 if (!UseSharedSpaces) {
310 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
311 _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK);
312 }
313
314 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
315
316 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
317 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
318 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
319 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
320 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
321 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK);
322 }
323 }
324
325 vmSymbols::initialize(CHECK);
326
327 SystemDictionary::initialize(CHECK);
328
329 Klass* ok = SystemDictionary::Object_klass();
330
331 _the_null_string = StringTable::intern("null", CHECK);
332 _the_min_jint_string = StringTable::intern("-2147483648", CHECK);
333
334 #if INCLUDE_CDS
335 if (UseSharedSpaces) {
336 // Verify shared interfaces array.
337 assert(_the_array_interfaces_array->at(0) ==
338 SystemDictionary::Cloneable_klass(), "u3");
339 assert(_the_array_interfaces_array->at(1) ==
340 SystemDictionary::Serializable_klass(), "u3");
341 } else
342 #endif
343 {
344 // Set up shared interfaces array. (Do this before supers are set up.)
345 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
346 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
347 }
348
349 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
350 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
351 initialize_basic_type_klass(floatArrayKlassObj(), CHECK);
352 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
353 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
354 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
355 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
356 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
357 } // end of core bootstrapping
358
359 {
360 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
361 _the_null_sentinel = tns();
362 }
363
364 // Maybe this could be lifted up now that object array can be initialized
365 // during the bootstrapping.
366
367 // OLD
368 // Initialize _objectArrayKlass after core bootstraping to make
369 // sure the super class is set up properly for _objectArrayKlass.
370 // ---
371 // NEW
372 // Since some of the old system object arrays have been converted to
373 // ordinary object arrays, _objectArrayKlass will be loaded when
374 // SystemDictionary::initialize(CHECK); is run. See the extra check
375 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
376 _objectArrayKlassObj = InstanceKlass::
377 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
378 // OLD
379 // Add the class to the class hierarchy manually to make sure that
380 // its vtable is initialized after core bootstrapping is completed.
381 // ---
382 // New
383 // Have already been initialized.
384 _objectArrayKlassObj->append_to_sibling_list();
385
386 #ifdef ASSERT
387 if (FullGCALot) {
388 // Allocate an array of dummy objects.
389 // We'd like these to be at the bottom of the old generation,
390 // so that when we free one and then collect,
391 // (almost) the whole heap moves
392 // and we find out if we actually update all the oops correctly.
393 // But we can't allocate directly in the old generation,
394 // so we allocate wherever, and hope that the first collection
395 // moves these objects to the bottom of the old generation.
396 // We can allocate directly in the permanent generation, so we do.
397 int size = FullGCALotDummies * 2;
398
399 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
400 objArrayHandle dummy_array(THREAD, naked_array);
401 int i = 0;
402 while (i < size) {
403 // Allocate dummy in old generation
404 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK);
405 dummy_array->obj_at_put(i++, dummy);
406 }
407 {
408 // Only modify the global variable inside the mutex.
409 // If we had a race to here, the other dummy_array instances
410 // and their elements just get dropped on the floor, which is fine.
411 MutexLocker ml(THREAD, FullGCALot_lock);
412 if (_fullgc_alot_dummy_array == NULL) {
413 _fullgc_alot_dummy_array = dummy_array();
414 }
415 }
416 assert(i == _fullgc_alot_dummy_array->length(), "just checking");
417 }
418 #endif
419 }
420
421 #define ASSERT_MIRROR_NOT_NULL(m) \
422 assert(m != NULL, "archived mirrors should not be NULL");
423
424 void Universe::initialize_basic_type_mirrors(TRAPS) {
425 #if INCLUDE_CDS_JAVA_HEAP
426 if (UseSharedSpaces &&
427 HeapShared::open_archive_heap_region_mapped() &&
428 _int_mirror != NULL) {
429 assert(HeapShared::is_heap_object_archiving_allowed(), "Sanity");
430 PRIMITIVE_MIRRORS_DO(ASSERT_MIRROR_NOT_NULL);
431 } else
432 // _int_mirror could be NULL if archived heap is not mapped.
433 #endif
434 {
435 _int_mirror =
436 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK);
437 _float_mirror =
438 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK);
439 _double_mirror =
440 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK);
441 _byte_mirror =
442 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK);
443 _bool_mirror =
444 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
445 _char_mirror =
446 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK);
447 _long_mirror =
448 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK);
449 _short_mirror =
450 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK);
451 _void_mirror =
452 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK);
453 }
454
455 _mirrors[T_INT] = _int_mirror;
456 _mirrors[T_FLOAT] = _float_mirror;
457 _mirrors[T_DOUBLE] = _double_mirror;
458 _mirrors[T_BYTE] = _byte_mirror;
459 _mirrors[T_BOOLEAN] = _bool_mirror;
460 _mirrors[T_CHAR] = _char_mirror;
461 _mirrors[T_LONG] = _long_mirror;
462 _mirrors[T_SHORT] = _short_mirror;
463 _mirrors[T_VOID] = _void_mirror;
464 //_mirrors[T_OBJECT] = _object_klass->java_mirror();
465 //_mirrors[T_ARRAY] = _object_klass->java_mirror();
466 }
467
468 void Universe::fixup_mirrors(TRAPS) {
469 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
470 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
471 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
472 // that the number of objects allocated at this point is very small.
473 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
474 HandleMark hm(THREAD);
475
476 if (!UseSharedSpaces) {
477 // Cache the start of the static fields
478 InstanceMirrorKlass::init_offset_of_static_fields();
479 }
480
481 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
482 int list_length = list->length();
483 for (int i = 0; i < list_length; i++) {
484 Klass* k = list->at(i);
485 assert(k->is_klass(), "List should only hold classes");
486 EXCEPTION_MARK;
487 java_lang_Class::fixup_mirror(k, CATCH);
488 }
489 delete java_lang_Class::fixup_mirror_list();
490 java_lang_Class::set_fixup_mirror_list(NULL);
491 }
492
493 #define assert_pll_locked(test) \
494 assert(Heap_lock->test(), "Reference pending list access requires lock")
495
496 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
497
498 oop Universe::reference_pending_list() {
499 if (Thread::current()->is_VM_thread()) {
500 assert_pll_locked(is_locked);
501 } else {
502 assert_pll_ownership();
503 }
504 return _reference_pending_list;
505 }
506
507 void Universe::set_reference_pending_list(oop list) {
508 assert_pll_ownership();
509 _reference_pending_list = list;
510 }
511
512 bool Universe::has_reference_pending_list() {
513 assert_pll_ownership();
514 return _reference_pending_list != NULL;
515 }
516
517 oop Universe::swap_reference_pending_list(oop list) {
518 assert_pll_locked(is_locked);
519 return Atomic::xchg(&_reference_pending_list, list);
520 }
521
522 #undef assert_pll_locked
523 #undef assert_pll_ownership
524
525 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) {
526 // init vtable of k and all subclasses
527 ko->vtable().initialize_vtable(false, CHECK);
528 if (ko->is_instance_klass()) {
529 for (Klass* sk = ko->subklass();
530 sk != NULL;
531 sk = sk->next_sibling()) {
532 reinitialize_vtable_of(sk, CHECK);
533 }
534 }
535 }
536
537 void Universe::reinitialize_vtables(TRAPS) {
538 // The vtables are initialized by starting at java.lang.Object and
539 // initializing through the subclass links, so that the super
540 // classes are always initialized first.
541 Klass* ok = SystemDictionary::Object_klass();
542 Universe::reinitialize_vtable_of(ok, THREAD);
543 }
544
545
546 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) {
547 k->itable().initialize_itable(false, CHECK);
548 }
549
550
551 void Universe::reinitialize_itables(TRAPS) {
552 MutexLocker mcld(THREAD, ClassLoaderDataGraph_lock);
553 ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK);
554 }
555
556
557 bool Universe::on_page_boundary(void* addr) {
558 return is_aligned(addr, os::vm_page_size());
559 }
560
561
562 bool Universe::should_fill_in_stack_trace(Handle throwable) {
563 // never attempt to fill in the stack trace of preallocated errors that do not have
564 // backtrace. These errors are kept alive forever and may be "re-used" when all
565 // preallocated errors with backtrace have been consumed. Also need to avoid
566 // a potential loop which could happen if an out of memory occurs when attempting
567 // to allocate the backtrace.
568 return ((throwable() != Universe::_out_of_memory_error_java_heap) &&
569 (throwable() != Universe::_out_of_memory_error_metaspace) &&
570 (throwable() != Universe::_out_of_memory_error_class_metaspace) &&
571 (throwable() != Universe::_out_of_memory_error_array_size) &&
572 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) &&
573 (throwable() != Universe::_out_of_memory_error_realloc_objects) &&
574 (throwable() != Universe::_out_of_memory_error_retry));
575 }
576
577
578 oop Universe::gen_out_of_memory_error(oop default_err) {
579 // generate an out of memory error:
580 // - if there is a preallocated error and stack traces are available
581 // (j.l.Throwable is initialized), then return the preallocated
582 // error with a filled in stack trace, and with the message
583 // provided by the default error.
584 // - otherwise, return the default error, without a stack trace.
585 int next;
586 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
587 SystemDictionary::Throwable_klass()->is_initialized()) {
588 next = (int)Atomic::add(&_preallocated_out_of_memory_error_avail_count, -1);
589 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
590 } else {
591 next = -1;
592 }
593 if (next < 0) {
594 // all preallocated errors have been used.
595 // return default
596 return default_err;
597 } else {
598 Thread* THREAD = Thread::current();
599 Handle default_err_h(THREAD, default_err);
600 // get the error object at the slot and set set it to NULL so that the
601 // array isn't keeping it alive anymore.
602 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next));
603 assert(exc() != NULL, "slot has been used already");
604 preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
605
606 // use the message from the default error
607 oop msg = java_lang_Throwable::message(default_err_h());
608 assert(msg != NULL, "no message");
609 java_lang_Throwable::set_message(exc(), msg);
610
611 // populate the stack trace and return it.
612 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
613 return exc();
614 }
615 }
616
617 intptr_t Universe::_non_oop_bits = 0;
618
619 void* Universe::non_oop_word() {
620 // Neither the high bits nor the low bits of this value is allowed
621 // to look like (respectively) the high or low bits of a real oop.
622 //
623 // High and low are CPU-specific notions, but low always includes
624 // the low-order bit. Since oops are always aligned at least mod 4,
625 // setting the low-order bit will ensure that the low half of the
626 // word will never look like that of a real oop.
627 //
628 // Using the OS-supplied non-memory-address word (usually 0 or -1)
629 // will take care of the high bits, however many there are.
630
631 if (_non_oop_bits == 0) {
632 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
633 }
634
635 return (void*)_non_oop_bits;
636 }
637
638 static void initialize_global_behaviours() {
639 CompiledICProtectionBehaviour::set_current(new DefaultICProtectionBehaviour());
640 }
641
642 jint universe_init() {
643 assert(!Universe::_fully_initialized, "called after initialize_vtables");
644 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
645 "LogHeapWordSize is incorrect.");
646 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
647 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
648 "oop size is not not a multiple of HeapWord size");
649
650 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
651
652 JavaClasses::compute_hard_coded_offsets();
653
654 initialize_global_behaviours();
655
656 GCConfig::arguments()->initialize_heap_sizes();
657
658 jint status = Universe::initialize_heap();
659 if (status != JNI_OK) {
660 return status;
661 }
662
663 Universe::initialize_tlab();
664
665 Metaspace::global_initialize();
666
667 // Initialize performance counters for metaspaces
668 MetaspaceCounters::initialize_performance_counters();
669 CompressedClassSpaceCounters::initialize_performance_counters();
670
671 AOTLoader::universe_init();
672
673 // Checks 'AfterMemoryInit' constraints.
674 if (!JVMFlagConstraintList::check_constraints(JVMFlagConstraint::AfterMemoryInit)) {
675 return JNI_EINVAL;
676 }
677
678 // Create memory for metadata. Must be after initializing heap for
679 // DumpSharedSpaces.
680 ClassLoaderData::init_null_class_loader_data();
681
682 // We have a heap so create the Method* caches before
683 // Metaspace::initialize_shared_spaces() tries to populate them.
684 Universe::_finalizer_register_cache = new LatestMethodCache();
685 Universe::_loader_addClass_cache = new LatestMethodCache();
686 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
687 Universe::_throw_no_such_method_error_cache = new LatestMethodCache();
688 Universe::_do_stack_walk_cache = new LatestMethodCache();
689
690 #if INCLUDE_CDS
691 if (UseSharedSpaces) {
692 // Read the data structures supporting the shared spaces (shared
693 // system dictionary, symbol table, etc.). After that, access to
694 // the file (other than the mapped regions) is no longer needed, and
695 // the file is closed. Closing the file does not affect the
696 // currently mapped regions.
697 MetaspaceShared::initialize_shared_spaces();
698 StringTable::create_table();
699 } else
700 #endif
701 {
702 SymbolTable::create_table();
703 StringTable::create_table();
704 }
705
706 #if INCLUDE_CDS
707 if (Arguments::is_dumping_archive()) {
708 MetaspaceShared::prepare_for_dumping();
709 }
710 #endif
711
712 if (strlen(VerifySubSet) > 0) {
713 Universe::initialize_verify_flags();
714 }
715
716 ResolvedMethodTable::create_table();
717
718 return JNI_OK;
719 }
720
721 jint Universe::initialize_heap() {
722 assert(_collectedHeap == NULL, "Heap already created");
723 _collectedHeap = GCConfig::arguments()->create_heap();
724 jint status = _collectedHeap->initialize();
725
726 if (status == JNI_OK) {
727 log_info(gc)("Using %s", _collectedHeap->name());
728 }
729
730 return status;
731 }
732
733 void Universe::initialize_tlab() {
734 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
735 if (UseTLAB) {
736 assert(Universe::heap()->supports_tlab_allocation(),
737 "Should support thread-local allocation buffers");
738 ThreadLocalAllocBuffer::startup_initialization();
739 }
740 }
741
742 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
743
744 assert(alignment <= Arguments::conservative_max_heap_alignment(),
745 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
746 alignment, Arguments::conservative_max_heap_alignment());
747
748 size_t total_reserved = align_up(heap_size, alignment);
749 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
750 "heap size is too big for compressed oops");
751
752 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size());
753 assert(!UseLargePages
754 || UseParallelGC
755 || use_large_pages, "Wrong alignment to use large pages");
756
757 // Now create the space.
758 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt);
759
760 if (total_rs.is_reserved()) {
761 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
762 "must be exactly of required size and alignment");
763 // We are good.
764
765 if (AllocateHeapAt != NULL) {
766 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
767 }
768
769 if (UseCompressedOops) {
770 CompressedOops::initialize(total_rs);
771 }
772
773 Universe::calculate_verify_data((HeapWord*)total_rs.base(), (HeapWord*)total_rs.end());
774
775 return total_rs;
776 }
777
778 vm_exit_during_initialization(
779 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
780 total_reserved/K));
781
782 // satisfy compiler
783 ShouldNotReachHere();
784 return ReservedHeapSpace(0, 0, false);
785 }
786
787
788 // It's the caller's responsibility to ensure glitch-freedom
789 // (if required).
790 void Universe::update_heap_info_at_gc() {
791 _heap_capacity_at_last_gc = heap()->capacity();
792 _heap_used_at_last_gc = heap()->used();
793 }
794
795 void initialize_known_method(LatestMethodCache* method_cache,
796 InstanceKlass* ik,
797 const char* method,
798 Symbol* signature,
799 bool is_static, TRAPS)
800 {
801 TempNewSymbol name = SymbolTable::new_symbol(method);
802 Method* m = NULL;
803 // The klass must be linked before looking up the method.
804 if (!ik->link_class_or_fail(THREAD) ||
805 ((m = ik->find_method(name, signature)) == NULL) ||
806 is_static != m->is_static()) {
807 ResourceMark rm(THREAD);
808 // NoSuchMethodException doesn't actually work because it tries to run the
809 // <init> function before java_lang_Class is linked. Print error and exit.
810 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
811 ik->name()->as_C_string(), method));
812 }
813 method_cache->init(ik, m);
814 }
815
816 void Universe::initialize_known_methods(TRAPS) {
817 // Set up static method for registering finalizers
818 initialize_known_method(_finalizer_register_cache,
819 SystemDictionary::Finalizer_klass(),
820 "register",
821 vmSymbols::object_void_signature(), true, CHECK);
822
823 initialize_known_method(_throw_illegal_access_error_cache,
824 SystemDictionary::internal_Unsafe_klass(),
825 "throwIllegalAccessError",
826 vmSymbols::void_method_signature(), true, CHECK);
827
828 initialize_known_method(_throw_no_such_method_error_cache,
829 SystemDictionary::internal_Unsafe_klass(),
830 "throwNoSuchMethodError",
831 vmSymbols::void_method_signature(), true, CHECK);
832
833 // Set up method for registering loaded classes in class loader vector
834 initialize_known_method(_loader_addClass_cache,
835 SystemDictionary::ClassLoader_klass(),
836 "addClass",
837 vmSymbols::class_void_signature(), false, CHECK);
838
839 // Set up method for stack walking
840 initialize_known_method(_do_stack_walk_cache,
841 SystemDictionary::AbstractStackWalker_klass(),
842 "doStackWalk",
843 vmSymbols::doStackWalk_signature(), false, CHECK);
844 }
845
846 void universe2_init() {
847 EXCEPTION_MARK;
848 Universe::genesis(CATCH);
849 }
850
851 // Set after initialization of the module runtime, call_initModuleRuntime
852 void universe_post_module_init() {
853 Universe::_module_initialized = true;
854 }
855
856 bool universe_post_init() {
857 assert(!is_init_completed(), "Error: initialization not yet completed!");
858 Universe::_fully_initialized = true;
859 EXCEPTION_MARK;
860 if (!UseSharedSpaces) {
861 ResourceMark rm;
862 Universe::reinitialize_vtables(CHECK_false);
863 Universe::reinitialize_itables(CHECK_false);
864 }
865
866 HandleMark hm(THREAD);
867 // Setup preallocated empty java.lang.Class array
868 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
869
870 // Setup preallocated OutOfMemoryError errors
871 Klass* k = SystemDictionary::OutOfMemoryError_klass();
872 InstanceKlass* ik = InstanceKlass::cast(k);
873 Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false);
874 Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false);
875 Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false);
876 Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false);
877 Universe::_out_of_memory_error_gc_overhead_limit =
878 ik->allocate_instance(CHECK_false);
879 Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false);
880 Universe::_out_of_memory_error_retry = ik->allocate_instance(CHECK_false);
881
882 // Setup preallocated cause message for delayed StackOverflowError
883 if (StackReservedPages > 0) {
884 Universe::_delayed_stack_overflow_error_message =
885 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
886 }
887
888 // Setup preallocated NullPointerException
889 // (this is currently used for a cheap & dirty solution in compiler exception handling)
890 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
891 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
892 // Setup preallocated ArithmeticException
893 // (this is currently used for a cheap & dirty solution in compiler exception handling)
894 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
895 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
896 // Virtual Machine Error for when we get into a situation we can't resolve
897 k = SystemDictionary::VirtualMachineError_klass();
898 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
899 if (!linked) {
900 tty->print_cr("Unable to link/verify VirtualMachineError class");
901 return false; // initialization failed
902 }
903 Universe::_virtual_machine_error_instance =
904 InstanceKlass::cast(k)->allocate_instance(CHECK_false);
905
906 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
907
908 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
909 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
910
911 msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
912 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
913 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
914 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
915
916 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
917 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
918
919 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
920 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
921
922 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false);
923 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg());
924
925 msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK_false);
926 java_lang_Throwable::set_message(Universe::_out_of_memory_error_retry, msg());
927
928 msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
929 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
930
931 // Setup the array of errors that have preallocated backtrace
932 k = Universe::_out_of_memory_error_java_heap->klass();
933 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
934 ik = InstanceKlass::cast(k);
935
936 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
937 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false);
938 for (int i=0; i<len; i++) {
939 oop err = ik->allocate_instance(CHECK_false);
940 Handle err_h = Handle(THREAD, err);
941 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
942 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
943 }
944 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
945
946 Universe::initialize_known_methods(CHECK_false);
947
948 // This needs to be done before the first scavenge/gc, since
949 // it's an input to soft ref clearing policy.
950 {
951 MutexLocker x(THREAD, Heap_lock);
952 Universe::update_heap_info_at_gc();
953 }
954
955 // ("weak") refs processing infrastructure initialization
956 Universe::heap()->post_initialize();
957
958 MemoryService::add_metaspace_memory_pools();
959
960 MemoryService::set_universe_heap(Universe::heap());
961 #if INCLUDE_CDS
962 MetaspaceShared::post_initialize(CHECK_false);
963 #endif
964 return true;
965 }
966
967
968 void Universe::compute_base_vtable_size() {
969 _base_vtable_size = ClassLoader::compute_Object_vtable();
970 }
971
972 void Universe::print_on(outputStream* st) {
973 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
974 st->print_cr("Heap");
975 heap()->print_on(st);
976 }
977
978 void Universe::print_heap_at_SIGBREAK() {
979 if (PrintHeapAtSIGBREAK) {
980 print_on(tty);
981 tty->cr();
982 tty->flush();
983 }
984 }
985
986 void Universe::print_heap_before_gc() {
987 LogTarget(Debug, gc, heap) lt;
988 if (lt.is_enabled()) {
989 LogStream ls(lt);
990 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
991 ResourceMark rm;
992 heap()->print_on(&ls);
993 }
994 }
995
996 void Universe::print_heap_after_gc() {
997 LogTarget(Debug, gc, heap) lt;
998 if (lt.is_enabled()) {
999 LogStream ls(lt);
1000 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1001 ResourceMark rm;
1002 heap()->print_on(&ls);
1003 }
1004 }
1005
1006 void Universe::initialize_verify_flags() {
1007 verify_flags = 0;
1008 const char delimiter[] = " ,";
1009
1010 size_t length = strlen(VerifySubSet);
1011 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1012 strncpy(subset_list, VerifySubSet, length + 1);
1013 char* save_ptr;
1014
1015 char* token = strtok_r(subset_list, delimiter, &save_ptr);
1016 while (token != NULL) {
1017 if (strcmp(token, "threads") == 0) {
1018 verify_flags |= Verify_Threads;
1019 } else if (strcmp(token, "heap") == 0) {
1020 verify_flags |= Verify_Heap;
1021 } else if (strcmp(token, "symbol_table") == 0) {
1022 verify_flags |= Verify_SymbolTable;
1023 } else if (strcmp(token, "string_table") == 0) {
1024 verify_flags |= Verify_StringTable;
1025 } else if (strcmp(token, "codecache") == 0) {
1026 verify_flags |= Verify_CodeCache;
1027 } else if (strcmp(token, "dictionary") == 0) {
1028 verify_flags |= Verify_SystemDictionary;
1029 } else if (strcmp(token, "classloader_data_graph") == 0) {
1030 verify_flags |= Verify_ClassLoaderDataGraph;
1031 } else if (strcmp(token, "metaspace") == 0) {
1032 verify_flags |= Verify_MetaspaceUtils;
1033 } else if (strcmp(token, "jni_handles") == 0) {
1034 verify_flags |= Verify_JNIHandles;
1035 } else if (strcmp(token, "codecache_oops") == 0) {
1036 verify_flags |= Verify_CodeCacheOops;
1037 } else if (strcmp(token, "resolved_method_table") == 0) {
1038 verify_flags |= Verify_ResolvedMethodTable;
1039 } else {
1040 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1041 }
1042 token = strtok_r(NULL, delimiter, &save_ptr);
1043 }
1044 FREE_C_HEAP_ARRAY(char, subset_list);
1045 }
1046
1047 bool Universe::should_verify_subset(uint subset) {
1048 if (verify_flags & subset) {
1049 return true;
1050 }
1051 return false;
1052 }
1053
1054 void Universe::verify(VerifyOption option, const char* prefix) {
1055 // The use of _verify_in_progress is a temporary work around for
1056 // 6320749. Don't bother with a creating a class to set and clear
1057 // it since it is only used in this method and the control flow is
1058 // straight forward.
1059 _verify_in_progress = true;
1060
1061 COMPILER2_PRESENT(
1062 assert(!DerivedPointerTable::is_active(),
1063 "DPT should not be active during verification "
1064 "(of thread stacks below)");
1065 )
1066
1067 ResourceMark rm;
1068 HandleMark hm; // Handles created during verification can be zapped
1069 _verify_count++;
1070
1071 FormatBuffer<> title("Verifying %s", prefix);
1072 GCTraceTime(Info, gc, verify) tm(title.buffer());
1073 if (should_verify_subset(Verify_Threads)) {
1074 log_debug(gc, verify)("Threads");
1075 Threads::verify();
1076 }
1077 if (should_verify_subset(Verify_Heap)) {
1078 log_debug(gc, verify)("Heap");
1079 heap()->verify(option);
1080 }
1081 if (should_verify_subset(Verify_SymbolTable)) {
1082 log_debug(gc, verify)("SymbolTable");
1083 SymbolTable::verify();
1084 }
1085 if (should_verify_subset(Verify_StringTable)) {
1086 log_debug(gc, verify)("StringTable");
1087 StringTable::verify();
1088 }
1089 if (should_verify_subset(Verify_CodeCache)) {
1090 {
1091 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1092 log_debug(gc, verify)("CodeCache");
1093 CodeCache::verify();
1094 }
1095 }
1096 if (should_verify_subset(Verify_SystemDictionary)) {
1097 log_debug(gc, verify)("SystemDictionary");
1098 SystemDictionary::verify();
1099 }
1100 #ifndef PRODUCT
1101 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1102 log_debug(gc, verify)("ClassLoaderDataGraph");
1103 ClassLoaderDataGraph::verify();
1104 }
1105 #endif
1106 if (should_verify_subset(Verify_MetaspaceUtils)) {
1107 log_debug(gc, verify)("MetaspaceUtils");
1108 MetaspaceUtils::verify_free_chunks();
1109 }
1110 if (should_verify_subset(Verify_JNIHandles)) {
1111 log_debug(gc, verify)("JNIHandles");
1112 JNIHandles::verify();
1113 }
1114 if (should_verify_subset(Verify_CodeCacheOops)) {
1115 log_debug(gc, verify)("CodeCache Oops");
1116 CodeCache::verify_oops();
1117 }
1118 if (should_verify_subset(Verify_ResolvedMethodTable)) {
1119 log_debug(gc, verify)("ResolvedMethodTable Oops");
1120 ResolvedMethodTable::verify();
1121 }
1122
1123 _verify_in_progress = false;
1124 }
1125
1126
1127 #ifndef PRODUCT
1128 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1129 assert(low_boundary < high_boundary, "bad interval");
1130
1131 // decide which low-order bits we require to be clear:
1132 size_t alignSize = MinObjAlignmentInBytes;
1133 size_t min_object_size = CollectedHeap::min_fill_size();
1134
1135 // make an inclusive limit:
1136 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1137 uintptr_t min = (uintptr_t)low_boundary;
1138 assert(min < max, "bad interval");
1139 uintptr_t diff = max ^ min;
1140
1141 // throw away enough low-order bits to make the diff vanish
1142 uintptr_t mask = (uintptr_t)(-1);
1143 while ((mask & diff) != 0)
1144 mask <<= 1;
1145 uintptr_t bits = (min & mask);
1146 assert(bits == (max & mask), "correct mask");
1147 // check an intermediate value between min and max, just to make sure:
1148 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1149
1150 // require address alignment, too:
1151 mask |= (alignSize - 1);
1152
1153 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1154 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1155 }
1156 _verify_oop_mask = mask;
1157 _verify_oop_bits = bits;
1158 }
1159
1160 // Oop verification (see MacroAssembler::verify_oop)
1161
1162 uintptr_t Universe::verify_oop_mask() {
1163 return _verify_oop_mask;
1164 }
1165
1166 uintptr_t Universe::verify_oop_bits() {
1167 return _verify_oop_bits;
1168 }
1169
1170 uintptr_t Universe::verify_mark_mask() {
1171 return markWord::lock_mask_in_place;
1172 }
1173
1174 uintptr_t Universe::verify_mark_bits() {
1175 intptr_t mask = verify_mark_mask();
1176 intptr_t bits = (intptr_t)markWord::prototype().value();
1177 assert((bits & ~mask) == 0, "no stray header bits");
1178 return bits;
1179 }
1180 #endif // PRODUCT
1181
1182
1183 void LatestMethodCache::init(Klass* k, Method* m) {
1184 if (!UseSharedSpaces) {
1185 _klass = k;
1186 }
1187 #ifndef PRODUCT
1188 else {
1189 // sharing initilization should have already set up _klass
1190 assert(_klass != NULL, "just checking");
1191 }
1192 #endif
1193
1194 _method_idnum = m->method_idnum();
1195 assert(_method_idnum >= 0, "sanity check");
1196 }
1197
1198
1199 Method* LatestMethodCache::get_method() {
1200 if (klass() == NULL) return NULL;
1201 InstanceKlass* ik = InstanceKlass::cast(klass());
1202 Method* m = ik->method_with_idnum(method_idnum());
1203 assert(m != NULL, "sanity check");
1204 return m;
1205 }
1206
1207
1208 #ifdef ASSERT
1209 // Release dummy object(s) at bottom of heap
1210 bool Universe::release_fullgc_alot_dummy() {
1211 MutexLocker ml(FullGCALot_lock);
1212 if (_fullgc_alot_dummy_array != NULL) {
1213 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
1214 // No more dummies to release, release entire array instead
1215 _fullgc_alot_dummy_array = NULL;
1216 return false;
1217 }
1218
1219 // Release dummy at bottom of old generation
1220 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1221
1222 // Release dummy at bottom of permanent generation
1223 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1224 }
1225 return true;
1226 }
1227
1228 #endif // ASSERT