1 /*
2 * Copyright (c) 1997, 2019, 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 }
209
210 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
211 it->push(&_klass);
212 }
213
214 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
215 for (int i = 0; i < T_LONG+1; i++) {
216 it->push(&_typeArrayKlassObjs[i]);
217 }
218 it->push(&_objectArrayKlassObj);
219
220 it->push(&_the_empty_int_array);
221 it->push(&_the_empty_short_array);
222 it->push(&_the_empty_klass_array);
223 it->push(&_the_empty_instance_klass_array);
224 it->push(&_the_empty_method_array);
225 it->push(&_the_array_interfaces_array);
226
227 _finalizer_register_cache->metaspace_pointers_do(it);
228 _loader_addClass_cache->metaspace_pointers_do(it);
229 _throw_illegal_access_error_cache->metaspace_pointers_do(it);
230 _throw_no_such_method_error_cache->metaspace_pointers_do(it);
231 _do_stack_walk_cache->metaspace_pointers_do(it);
232 }
233
234 #define ASSERT_MIRROR_NULL(m) \
235 assert(m == NULL, "archived mirrors should be NULL");
236
237 #define SERIALIZE_MIRROR(m) \
238 f->do_oop(&m); \
239 if (m != NULL) { java_lang_Class::update_archived_primitive_mirror_native_pointers(m); }
240
241 // Serialize metadata and pointers to primitive type mirrors in and out of CDS archive
242 void Universe::serialize(SerializeClosure* f) {
243
244 for (int i = 0; i < T_LONG+1; i++) {
245 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
246 }
247
248 f->do_ptr((void**)&_objectArrayKlassObj);
249
250 #if INCLUDE_CDS_JAVA_HEAP
251 DEBUG_ONLY(if (DumpSharedSpaces && !HeapShared::is_heap_object_archiving_allowed()) {
252 PRIMITIVE_MIRRORS_DO(ASSERT_MIRROR_NULL);
253 });
254 PRIMITIVE_MIRRORS_DO(SERIALIZE_MIRROR);
255 #endif
256
257 f->do_ptr((void**)&_the_array_interfaces_array);
258 f->do_ptr((void**)&_the_empty_int_array);
259 f->do_ptr((void**)&_the_empty_short_array);
260 f->do_ptr((void**)&_the_empty_method_array);
261 f->do_ptr((void**)&_the_empty_klass_array);
262 f->do_ptr((void**)&_the_empty_instance_klass_array);
263 _finalizer_register_cache->serialize(f);
264 _loader_addClass_cache->serialize(f);
265 _throw_illegal_access_error_cache->serialize(f);
266 _throw_no_such_method_error_cache->serialize(f);
267 _do_stack_walk_cache->serialize(f);
268 }
269
270 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
271 if (size < alignment || size % alignment != 0) {
272 vm_exit_during_initialization(
273 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
274 }
275 }
276
277 void initialize_basic_type_klass(Klass* k, TRAPS) {
278 Klass* ok = SystemDictionary::Object_klass();
279 #if INCLUDE_CDS
280 if (UseSharedSpaces) {
281 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
282 assert(k->super() == ok, "u3");
283 k->restore_unshareable_info(loader_data, Handle(), CHECK);
284 } else
285 #endif
286 {
287 k->initialize_supers(ok, NULL, CHECK);
288 }
289 k->append_to_sibling_list();
290 }
291
292 void Universe::genesis(TRAPS) {
293 ResourceMark rm;
294
295 { FlagSetting fs(_bootstrapping, true);
296
297 { MutexLocker mc(Compile_lock);
298
299 java_lang_Class::allocate_fixup_lists();
300
301 // determine base vtable size; without that we cannot create the array klasses
302 compute_base_vtable_size();
303
304 if (!UseSharedSpaces) {
305 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
306 _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK);
307 }
308
309 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
310
311 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
312 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
313 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
314 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
315 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
316 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK);
317 }
318 }
319
320 vmSymbols::initialize(CHECK);
321
322 SystemDictionary::initialize(CHECK);
323
324 Klass* ok = SystemDictionary::Object_klass();
325
326 _the_null_string = StringTable::intern("null", CHECK);
327 _the_min_jint_string = StringTable::intern("-2147483648", CHECK);
328
329 #if INCLUDE_CDS
330 if (UseSharedSpaces) {
331 // Verify shared interfaces array.
332 assert(_the_array_interfaces_array->at(0) ==
333 SystemDictionary::Cloneable_klass(), "u3");
334 assert(_the_array_interfaces_array->at(1) ==
335 SystemDictionary::Serializable_klass(), "u3");
336 } else
337 #endif
338 {
339 // Set up shared interfaces array. (Do this before supers are set up.)
340 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
341 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
342 }
343
344 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
345 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
346 initialize_basic_type_klass(floatArrayKlassObj(), CHECK);
347 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
348 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
349 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
350 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
351 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
352 } // end of core bootstrapping
353
354 {
355 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
356 _the_null_sentinel = tns();
357 }
358
359 // Maybe this could be lifted up now that object array can be initialized
360 // during the bootstrapping.
361
362 // OLD
363 // Initialize _objectArrayKlass after core bootstraping to make
364 // sure the super class is set up properly for _objectArrayKlass.
365 // ---
366 // NEW
367 // Since some of the old system object arrays have been converted to
368 // ordinary object arrays, _objectArrayKlass will be loaded when
369 // SystemDictionary::initialize(CHECK); is run. See the extra check
370 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
371 _objectArrayKlassObj = InstanceKlass::
372 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
373 // OLD
374 // Add the class to the class hierarchy manually to make sure that
375 // its vtable is initialized after core bootstrapping is completed.
376 // ---
377 // New
378 // Have already been initialized.
379 _objectArrayKlassObj->append_to_sibling_list();
380
381 #ifdef ASSERT
382 if (FullGCALot) {
383 // Allocate an array of dummy objects.
384 // We'd like these to be at the bottom of the old generation,
385 // so that when we free one and then collect,
386 // (almost) the whole heap moves
387 // and we find out if we actually update all the oops correctly.
388 // But we can't allocate directly in the old generation,
389 // so we allocate wherever, and hope that the first collection
390 // moves these objects to the bottom of the old generation.
391 // We can allocate directly in the permanent generation, so we do.
392 int size = FullGCALotDummies * 2;
393
394 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
395 objArrayHandle dummy_array(THREAD, naked_array);
396 int i = 0;
397 while (i < size) {
398 // Allocate dummy in old generation
399 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK);
400 dummy_array->obj_at_put(i++, dummy);
401 }
402 {
403 // Only modify the global variable inside the mutex.
404 // If we had a race to here, the other dummy_array instances
405 // and their elements just get dropped on the floor, which is fine.
406 MutexLocker ml(FullGCALot_lock);
407 if (_fullgc_alot_dummy_array == NULL) {
408 _fullgc_alot_dummy_array = dummy_array();
409 }
410 }
411 assert(i == _fullgc_alot_dummy_array->length(), "just checking");
412 }
413 #endif
414 }
415
416 #define ASSERT_MIRROR_NOT_NULL(m) \
417 assert(m != NULL, "archived mirrors should not be NULL");
418
419 void Universe::initialize_basic_type_mirrors(TRAPS) {
420 #if INCLUDE_CDS_JAVA_HEAP
421 if (UseSharedSpaces &&
422 HeapShared::open_archive_heap_region_mapped() &&
423 _int_mirror != NULL) {
424 assert(HeapShared::is_heap_object_archiving_allowed(), "Sanity");
425 PRIMITIVE_MIRRORS_DO(ASSERT_MIRROR_NOT_NULL);
426 } else
427 // _int_mirror could be NULL if archived heap is not mapped.
428 #endif
429 {
430 _int_mirror =
431 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK);
432 _float_mirror =
433 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK);
434 _double_mirror =
435 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK);
436 _byte_mirror =
437 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK);
438 _bool_mirror =
439 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
440 _char_mirror =
441 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK);
442 _long_mirror =
443 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK);
444 _short_mirror =
445 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK);
446 _void_mirror =
447 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK);
448 }
449
450 _mirrors[T_INT] = _int_mirror;
451 _mirrors[T_FLOAT] = _float_mirror;
452 _mirrors[T_DOUBLE] = _double_mirror;
453 _mirrors[T_BYTE] = _byte_mirror;
454 _mirrors[T_BOOLEAN] = _bool_mirror;
455 _mirrors[T_CHAR] = _char_mirror;
456 _mirrors[T_LONG] = _long_mirror;
457 _mirrors[T_SHORT] = _short_mirror;
458 _mirrors[T_VOID] = _void_mirror;
459 //_mirrors[T_OBJECT] = _object_klass->java_mirror();
460 //_mirrors[T_ARRAY] = _object_klass->java_mirror();
461 }
462
463 void Universe::fixup_mirrors(TRAPS) {
464 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
465 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
466 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
467 // that the number of objects allocated at this point is very small.
468 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
469 HandleMark hm(THREAD);
470
471 if (!UseSharedSpaces) {
472 // Cache the start of the static fields
473 InstanceMirrorKlass::init_offset_of_static_fields();
474 }
475
476 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
477 int list_length = list->length();
478 for (int i = 0; i < list_length; i++) {
479 Klass* k = list->at(i);
480 assert(k->is_klass(), "List should only hold classes");
481 EXCEPTION_MARK;
482 java_lang_Class::fixup_mirror(k, CATCH);
483 }
484 delete java_lang_Class::fixup_mirror_list();
485 java_lang_Class::set_fixup_mirror_list(NULL);
486 }
487
488 #define assert_pll_locked(test) \
489 assert(Heap_lock->test(), "Reference pending list access requires lock")
490
491 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
492
493 oop Universe::reference_pending_list() {
494 if (Thread::current()->is_VM_thread()) {
495 assert_pll_locked(is_locked);
496 } else {
497 assert_pll_ownership();
498 }
499 return _reference_pending_list;
500 }
501
502 void Universe::set_reference_pending_list(oop list) {
503 assert_pll_ownership();
504 _reference_pending_list = list;
505 }
506
507 bool Universe::has_reference_pending_list() {
508 assert_pll_ownership();
509 return _reference_pending_list != NULL;
510 }
511
512 oop Universe::swap_reference_pending_list(oop list) {
513 assert_pll_locked(is_locked);
514 return Atomic::xchg(list, &_reference_pending_list);
515 }
516
517 #undef assert_pll_locked
518 #undef assert_pll_ownership
519
520 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) {
521 // init vtable of k and all subclasses
522 ko->vtable().initialize_vtable(false, CHECK);
523 if (ko->is_instance_klass()) {
524 for (Klass* sk = ko->subklass();
525 sk != NULL;
526 sk = sk->next_sibling()) {
527 reinitialize_vtable_of(sk, CHECK);
528 }
529 }
530 }
531
532 void Universe::reinitialize_vtables(TRAPS) {
533 // The vtables are initialized by starting at java.lang.Object and
534 // initializing through the subclass links, so that the super
535 // classes are always initialized first.
536 Klass* ok = SystemDictionary::Object_klass();
537 Universe::reinitialize_vtable_of(ok, THREAD);
538 }
539
540
541 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) {
542 k->itable().initialize_itable(false, CHECK);
543 }
544
545
546 void Universe::reinitialize_itables(TRAPS) {
547 MutexLocker mcld(ClassLoaderDataGraph_lock);
548 ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK);
549 }
550
551
552 bool Universe::on_page_boundary(void* addr) {
553 return is_aligned(addr, os::vm_page_size());
554 }
555
556
557 bool Universe::should_fill_in_stack_trace(Handle throwable) {
558 // never attempt to fill in the stack trace of preallocated errors that do not have
559 // backtrace. These errors are kept alive forever and may be "re-used" when all
560 // preallocated errors with backtrace have been consumed. Also need to avoid
561 // a potential loop which could happen if an out of memory occurs when attempting
562 // to allocate the backtrace.
563 return ((throwable() != Universe::_out_of_memory_error_java_heap) &&
564 (throwable() != Universe::_out_of_memory_error_metaspace) &&
565 (throwable() != Universe::_out_of_memory_error_class_metaspace) &&
566 (throwable() != Universe::_out_of_memory_error_array_size) &&
567 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) &&
568 (throwable() != Universe::_out_of_memory_error_realloc_objects) &&
569 (throwable() != Universe::_out_of_memory_error_retry));
570 }
571
572
573 oop Universe::gen_out_of_memory_error(oop default_err) {
574 // generate an out of memory error:
575 // - if there is a preallocated error and stack traces are available
576 // (j.l.Throwable is initialized), then return the preallocated
577 // error with a filled in stack trace, and with the message
578 // provided by the default error.
579 // - otherwise, return the default error, without a stack trace.
580 int next;
581 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
582 SystemDictionary::Throwable_klass()->is_initialized()) {
583 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);
584 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
585 } else {
586 next = -1;
587 }
588 if (next < 0) {
589 // all preallocated errors have been used.
590 // return default
591 return default_err;
592 } else {
593 Thread* THREAD = Thread::current();
594 Handle default_err_h(THREAD, default_err);
595 // get the error object at the slot and set set it to NULL so that the
596 // array isn't keeping it alive anymore.
597 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next));
598 assert(exc() != NULL, "slot has been used already");
599 preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
600
601 // use the message from the default error
602 oop msg = java_lang_Throwable::message(default_err_h());
603 assert(msg != NULL, "no message");
604 java_lang_Throwable::set_message(exc(), msg);
605
606 // populate the stack trace and return it.
607 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
608 return exc();
609 }
610 }
611
612 intptr_t Universe::_non_oop_bits = 0;
613
614 void* Universe::non_oop_word() {
615 // Neither the high bits nor the low bits of this value is allowed
616 // to look like (respectively) the high or low bits of a real oop.
617 //
618 // High and low are CPU-specific notions, but low always includes
619 // the low-order bit. Since oops are always aligned at least mod 4,
620 // setting the low-order bit will ensure that the low half of the
621 // word will never look like that of a real oop.
622 //
623 // Using the OS-supplied non-memory-address word (usually 0 or -1)
624 // will take care of the high bits, however many there are.
625
626 if (_non_oop_bits == 0) {
627 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
628 }
629
630 return (void*)_non_oop_bits;
631 }
632
633 static void initialize_global_behaviours() {
634 CompiledICProtectionBehaviour::set_current(new DefaultICProtectionBehaviour());
635 }
636
637 jint universe_init() {
638 assert(!Universe::_fully_initialized, "called after initialize_vtables");
639 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
640 "LogHeapWordSize is incorrect.");
641 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
642 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
643 "oop size is not not a multiple of HeapWord size");
644
645 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
646
647 JavaClasses::compute_hard_coded_offsets();
648
649 initialize_global_behaviours();
650
651 GCConfig::arguments()->initialize_heap_sizes();
652
653 jint status = Universe::initialize_heap();
654 if (status != JNI_OK) {
655 return status;
656 }
657
658 Universe::initialize_tlab();
659
660 Metaspace::global_initialize();
661
662 // Initialize performance counters for metaspaces
663 MetaspaceCounters::initialize_performance_counters();
664 CompressedClassSpaceCounters::initialize_performance_counters();
665
666 AOTLoader::universe_init();
667
668 // Checks 'AfterMemoryInit' constraints.
669 if (!JVMFlagConstraintList::check_constraints(JVMFlagConstraint::AfterMemoryInit)) {
670 return JNI_EINVAL;
671 }
672
673 // Create memory for metadata. Must be after initializing heap for
674 // DumpSharedSpaces.
675 ClassLoaderData::init_null_class_loader_data();
676
677 // We have a heap so create the Method* caches before
678 // Metaspace::initialize_shared_spaces() tries to populate them.
679 Universe::_finalizer_register_cache = new LatestMethodCache();
680 Universe::_loader_addClass_cache = new LatestMethodCache();
681 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
682 Universe::_throw_no_such_method_error_cache = new LatestMethodCache();
683 Universe::_do_stack_walk_cache = new LatestMethodCache();
684
685 #if INCLUDE_CDS
686 if (UseSharedSpaces) {
687 // Read the data structures supporting the shared spaces (shared
688 // system dictionary, symbol table, etc.). After that, access to
689 // the file (other than the mapped regions) is no longer needed, and
690 // the file is closed. Closing the file does not affect the
691 // currently mapped regions.
692 MetaspaceShared::initialize_shared_spaces();
693 StringTable::create_table();
694 } else
695 #endif
696 {
697 SymbolTable::create_table();
698 StringTable::create_table();
699 }
700
701 #if INCLUDE_CDS
702 if (Arguments::is_dumping_archive()) {
703 MetaspaceShared::prepare_for_dumping();
704 }
705 #endif
706
707 if (strlen(VerifySubSet) > 0) {
708 Universe::initialize_verify_flags();
709 }
710
711 ResolvedMethodTable::create_table();
712
713 return JNI_OK;
714 }
715
716 jint Universe::initialize_heap() {
717 assert(_collectedHeap == NULL, "Heap already created");
718 _collectedHeap = GCConfig::arguments()->create_heap();
719 jint status = _collectedHeap->initialize();
720
721 if (status == JNI_OK) {
722 log_info(gc)("Using %s", _collectedHeap->name());
723 }
724
725 return status;
726 }
727
728 void Universe::initialize_tlab() {
729 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
730 if (UseTLAB) {
731 assert(Universe::heap()->supports_tlab_allocation(),
732 "Should support thread-local allocation buffers");
733 ThreadLocalAllocBuffer::startup_initialization();
734 }
735 }
736
737 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
738
739 assert(alignment <= Arguments::conservative_max_heap_alignment(),
740 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
741 alignment, Arguments::conservative_max_heap_alignment());
742
743 size_t total_reserved = align_up(heap_size, alignment);
744 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
745 "heap size is too big for compressed oops");
746
747 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size());
748 assert(!UseLargePages
749 || UseParallelGC
750 || use_large_pages, "Wrong alignment to use large pages");
751
752 // Now create the space.
753 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt);
754
755 if (total_rs.is_reserved()) {
756 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
757 "must be exactly of required size and alignment");
758 // We are good.
759
760 if (AllocateHeapAt != NULL) {
761 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
762 }
763
764 if (UseCompressedOops) {
765 CompressedOops::initialize(total_rs);
766 }
767
768 Universe::calculate_verify_data((HeapWord*)total_rs.base(), (HeapWord*)total_rs.end());
769
770 return total_rs;
771 }
772
773 vm_exit_during_initialization(
774 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
775 total_reserved/K));
776
777 // satisfy compiler
778 ShouldNotReachHere();
779 return ReservedHeapSpace(0, 0, false);
780 }
781
782
783 // It's the caller's responsibility to ensure glitch-freedom
784 // (if required).
785 void Universe::update_heap_info_at_gc() {
786 _heap_capacity_at_last_gc = heap()->capacity();
787 _heap_used_at_last_gc = heap()->used();
788 }
789
790 void initialize_known_method(LatestMethodCache* method_cache,
791 InstanceKlass* ik,
792 const char* method,
793 Symbol* signature,
794 bool is_static, TRAPS)
795 {
796 TempNewSymbol name = SymbolTable::new_symbol(method);
797 Method* m = NULL;
798 // The klass must be linked before looking up the method.
799 if (!ik->link_class_or_fail(THREAD) ||
800 ((m = ik->find_method(name, signature)) == NULL) ||
801 is_static != m->is_static()) {
802 ResourceMark rm(THREAD);
803 // NoSuchMethodException doesn't actually work because it tries to run the
804 // <init> function before java_lang_Class is linked. Print error and exit.
805 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
806 ik->name()->as_C_string(), method));
807 }
808 method_cache->init(ik, m);
809 }
810
811 void Universe::initialize_known_methods(TRAPS) {
812 // Set up static method for registering finalizers
813 initialize_known_method(_finalizer_register_cache,
814 SystemDictionary::Finalizer_klass(),
815 "register",
816 vmSymbols::object_void_signature(), true, CHECK);
817
818 initialize_known_method(_throw_illegal_access_error_cache,
819 SystemDictionary::internal_Unsafe_klass(),
820 "throwIllegalAccessError",
821 vmSymbols::void_method_signature(), true, CHECK);
822
823 initialize_known_method(_throw_no_such_method_error_cache,
824 SystemDictionary::internal_Unsafe_klass(),
825 "throwNoSuchMethodError",
826 vmSymbols::void_method_signature(), true, CHECK);
827
828 // Set up method for registering loaded classes in class loader vector
829 initialize_known_method(_loader_addClass_cache,
830 SystemDictionary::ClassLoader_klass(),
831 "addClass",
832 vmSymbols::class_void_signature(), false, CHECK);
833
834 // Set up method for stack walking
835 initialize_known_method(_do_stack_walk_cache,
836 SystemDictionary::AbstractStackWalker_klass(),
837 "doStackWalk",
838 vmSymbols::doStackWalk_signature(), false, CHECK);
839 }
840
841 void universe2_init() {
842 EXCEPTION_MARK;
843 Universe::genesis(CATCH);
844 }
845
846 // Set after initialization of the module runtime, call_initModuleRuntime
847 void universe_post_module_init() {
848 Universe::_module_initialized = true;
849 }
850
851 bool universe_post_init() {
852 assert(!is_init_completed(), "Error: initialization not yet completed!");
853 Universe::_fully_initialized = true;
854 EXCEPTION_MARK;
855 { ResourceMark rm;
856 Interpreter::initialize(); // needed for interpreter entry points
857 if (!UseSharedSpaces) {
858 Universe::reinitialize_vtables(CHECK_false);
859 Universe::reinitialize_itables(CHECK_false);
860 }
861 }
862
863 HandleMark hm(THREAD);
864 // Setup preallocated empty java.lang.Class array
865 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
866
867 // Setup preallocated OutOfMemoryError errors
868 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
869 InstanceKlass* ik = InstanceKlass::cast(k);
870 Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false);
871 Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false);
872 Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false);
873 Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false);
874 Universe::_out_of_memory_error_gc_overhead_limit =
875 ik->allocate_instance(CHECK_false);
876 Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false);
877 Universe::_out_of_memory_error_retry = ik->allocate_instance(CHECK_false);
878
879 // Setup preallocated cause message for delayed StackOverflowError
880 if (StackReservedPages > 0) {
881 Universe::_delayed_stack_overflow_error_message =
882 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
883 }
884
885 // Setup preallocated NullPointerException
886 // (this is currently used for a cheap & dirty solution in compiler exception handling)
887 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
888 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
889 // Setup preallocated ArithmeticException
890 // (this is currently used for a cheap & dirty solution in compiler exception handling)
891 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
892 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
893 // Virtual Machine Error for when we get into a situation we can't resolve
894 k = SystemDictionary::resolve_or_fail(
895 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
896 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
897 if (!linked) {
898 tty->print_cr("Unable to link/verify VirtualMachineError class");
899 return false; // initialization failed
900 }
901 Universe::_virtual_machine_error_instance =
902 InstanceKlass::cast(k)->allocate_instance(CHECK_false);
903
904 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
905
906 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
907 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
908
909 msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
910 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
911 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
912 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
913
914 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
915 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
916
917 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
918 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
919
920 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false);
921 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg());
922
923 msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK_false);
924 java_lang_Throwable::set_message(Universe::_out_of_memory_error_retry, msg());
925
926 msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
927 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
928
929 // Setup the array of errors that have preallocated backtrace
930 k = Universe::_out_of_memory_error_java_heap->klass();
931 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
932 ik = InstanceKlass::cast(k);
933
934 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
935 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false);
936 for (int i=0; i<len; i++) {
937 oop err = ik->allocate_instance(CHECK_false);
938 Handle err_h = Handle(THREAD, err);
939 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
940 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
941 }
942 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
943
944 Universe::initialize_known_methods(CHECK_false);
945
946 // This needs to be done before the first scavenge/gc, since
947 // it's an input to soft ref clearing policy.
948 {
949 MutexLocker x(Heap_lock);
950 Universe::update_heap_info_at_gc();
951 }
952
953 // ("weak") refs processing infrastructure initialization
954 Universe::heap()->post_initialize();
955
956 MemoryService::add_metaspace_memory_pools();
957
958 MemoryService::set_universe_heap(Universe::heap());
959 #if INCLUDE_CDS
960 MetaspaceShared::post_initialize(CHECK_false);
961 #endif
962 return true;
963 }
964
965
966 void Universe::compute_base_vtable_size() {
967 _base_vtable_size = ClassLoader::compute_Object_vtable();
968 }
969
970 void Universe::print_on(outputStream* st) {
971 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
972 st->print_cr("Heap");
973 heap()->print_on(st);
974 }
975
976 void Universe::print_heap_at_SIGBREAK() {
977 if (PrintHeapAtSIGBREAK) {
978 print_on(tty);
979 tty->cr();
980 tty->flush();
981 }
982 }
983
984 void Universe::print_heap_before_gc() {
985 LogTarget(Debug, gc, heap) lt;
986 if (lt.is_enabled()) {
987 LogStream ls(lt);
988 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
989 ResourceMark rm;
990 heap()->print_on(&ls);
991 }
992 }
993
994 void Universe::print_heap_after_gc() {
995 LogTarget(Debug, gc, heap) lt;
996 if (lt.is_enabled()) {
997 LogStream ls(lt);
998 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
999 ResourceMark rm;
1000 heap()->print_on(&ls);
1001 }
1002 }
1003
1004 void Universe::initialize_verify_flags() {
1005 verify_flags = 0;
1006 const char delimiter[] = " ,";
1007
1008 size_t length = strlen(VerifySubSet);
1009 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1010 strncpy(subset_list, VerifySubSet, length + 1);
1011 char* save_ptr;
1012
1013 char* token = strtok_r(subset_list, delimiter, &save_ptr);
1014 while (token != NULL) {
1015 if (strcmp(token, "threads") == 0) {
1016 verify_flags |= Verify_Threads;
1017 } else if (strcmp(token, "heap") == 0) {
1018 verify_flags |= Verify_Heap;
1019 } else if (strcmp(token, "symbol_table") == 0) {
1020 verify_flags |= Verify_SymbolTable;
1021 } else if (strcmp(token, "string_table") == 0) {
1022 verify_flags |= Verify_StringTable;
1023 } else if (strcmp(token, "codecache") == 0) {
1024 verify_flags |= Verify_CodeCache;
1025 } else if (strcmp(token, "dictionary") == 0) {
1026 verify_flags |= Verify_SystemDictionary;
1027 } else if (strcmp(token, "classloader_data_graph") == 0) {
1028 verify_flags |= Verify_ClassLoaderDataGraph;
1029 } else if (strcmp(token, "metaspace") == 0) {
1030 verify_flags |= Verify_MetaspaceUtils;
1031 } else if (strcmp(token, "jni_handles") == 0) {
1032 verify_flags |= Verify_JNIHandles;
1033 } else if (strcmp(token, "codecache_oops") == 0) {
1034 verify_flags |= Verify_CodeCacheOops;
1035 } else if (strcmp(token, "resolved_method_table") == 0) {
1036 verify_flags |= Verify_ResolvedMethodTable;
1037 } else {
1038 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1039 }
1040 token = strtok_r(NULL, delimiter, &save_ptr);
1041 }
1042 FREE_C_HEAP_ARRAY(char, subset_list);
1043 }
1044
1045 bool Universe::should_verify_subset(uint subset) {
1046 if (verify_flags & subset) {
1047 return true;
1048 }
1049 return false;
1050 }
1051
1052 void Universe::verify(VerifyOption option, const char* prefix) {
1053 // The use of _verify_in_progress is a temporary work around for
1054 // 6320749. Don't bother with a creating a class to set and clear
1055 // it since it is only used in this method and the control flow is
1056 // straight forward.
1057 _verify_in_progress = true;
1058
1059 COMPILER2_PRESENT(
1060 assert(!DerivedPointerTable::is_active(),
1061 "DPT should not be active during verification "
1062 "(of thread stacks below)");
1063 )
1064
1065 ResourceMark rm;
1066 HandleMark hm; // Handles created during verification can be zapped
1067 _verify_count++;
1068
1069 FormatBuffer<> title("Verifying %s", prefix);
1070 GCTraceTime(Info, gc, verify) tm(title.buffer());
1071 if (should_verify_subset(Verify_Threads)) {
1072 log_debug(gc, verify)("Threads");
1073 Threads::verify();
1074 }
1075 if (should_verify_subset(Verify_Heap)) {
1076 log_debug(gc, verify)("Heap");
1077 heap()->verify(option);
1078 }
1079 if (should_verify_subset(Verify_SymbolTable)) {
1080 log_debug(gc, verify)("SymbolTable");
1081 SymbolTable::verify();
1082 }
1083 if (should_verify_subset(Verify_StringTable)) {
1084 log_debug(gc, verify)("StringTable");
1085 StringTable::verify();
1086 }
1087 if (should_verify_subset(Verify_CodeCache)) {
1088 {
1089 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1090 log_debug(gc, verify)("CodeCache");
1091 CodeCache::verify();
1092 }
1093 }
1094 if (should_verify_subset(Verify_SystemDictionary)) {
1095 log_debug(gc, verify)("SystemDictionary");
1096 SystemDictionary::verify();
1097 }
1098 #ifndef PRODUCT
1099 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1100 log_debug(gc, verify)("ClassLoaderDataGraph");
1101 ClassLoaderDataGraph::verify();
1102 }
1103 #endif
1104 if (should_verify_subset(Verify_MetaspaceUtils)) {
1105 log_debug(gc, verify)("MetaspaceUtils");
1106 MetaspaceUtils::verify_free_chunks();
1107 }
1108 if (should_verify_subset(Verify_JNIHandles)) {
1109 log_debug(gc, verify)("JNIHandles");
1110 JNIHandles::verify();
1111 }
1112 if (should_verify_subset(Verify_CodeCacheOops)) {
1113 log_debug(gc, verify)("CodeCache Oops");
1114 CodeCache::verify_oops();
1115 }
1116 if (should_verify_subset(Verify_ResolvedMethodTable)) {
1117 log_debug(gc, verify)("ResolvedMethodTable Oops");
1118 ResolvedMethodTable::verify();
1119 }
1120
1121 _verify_in_progress = false;
1122 }
1123
1124
1125 #ifndef PRODUCT
1126 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1127 assert(low_boundary < high_boundary, "bad interval");
1128
1129 // decide which low-order bits we require to be clear:
1130 size_t alignSize = MinObjAlignmentInBytes;
1131 size_t min_object_size = CollectedHeap::min_fill_size();
1132
1133 // make an inclusive limit:
1134 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1135 uintptr_t min = (uintptr_t)low_boundary;
1136 assert(min < max, "bad interval");
1137 uintptr_t diff = max ^ min;
1138
1139 // throw away enough low-order bits to make the diff vanish
1140 uintptr_t mask = (uintptr_t)(-1);
1141 while ((mask & diff) != 0)
1142 mask <<= 1;
1143 uintptr_t bits = (min & mask);
1144 assert(bits == (max & mask), "correct mask");
1145 // check an intermediate value between min and max, just to make sure:
1146 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1147
1148 // require address alignment, too:
1149 mask |= (alignSize - 1);
1150
1151 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1152 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1153 }
1154 _verify_oop_mask = mask;
1155 _verify_oop_bits = bits;
1156 }
1157
1158 // Oop verification (see MacroAssembler::verify_oop)
1159
1160 uintptr_t Universe::verify_oop_mask() {
1161 return _verify_oop_mask;
1162 }
1163
1164 uintptr_t Universe::verify_oop_bits() {
1165 return _verify_oop_bits;
1166 }
1167
1168 uintptr_t Universe::verify_mark_mask() {
1169 return markWord::lock_mask_in_place;
1170 }
1171
1172 uintptr_t Universe::verify_mark_bits() {
1173 intptr_t mask = verify_mark_mask();
1174 intptr_t bits = (intptr_t)markWord::prototype().value();
1175 assert((bits & ~mask) == 0, "no stray header bits");
1176 return bits;
1177 }
1178 #endif // PRODUCT
1179
1180
1181 void LatestMethodCache::init(Klass* k, Method* m) {
1182 if (!UseSharedSpaces) {
1183 _klass = k;
1184 }
1185 #ifndef PRODUCT
1186 else {
1187 // sharing initilization should have already set up _klass
1188 assert(_klass != NULL, "just checking");
1189 }
1190 #endif
1191
1192 _method_idnum = m->method_idnum();
1193 assert(_method_idnum >= 0, "sanity check");
1194 }
1195
1196
1197 Method* LatestMethodCache::get_method() {
1198 if (klass() == NULL) return NULL;
1199 InstanceKlass* ik = InstanceKlass::cast(klass());
1200 Method* m = ik->method_with_idnum(method_idnum());
1201 assert(m != NULL, "sanity check");
1202 return m;
1203 }
1204
1205
1206 #ifdef ASSERT
1207 // Release dummy object(s) at bottom of heap
1208 bool Universe::release_fullgc_alot_dummy() {
1209 MutexLocker ml(FullGCALot_lock);
1210 if (_fullgc_alot_dummy_array != NULL) {
1211 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
1212 // No more dummies to release, release entire array instead
1213 _fullgc_alot_dummy_array = NULL;
1214 return false;
1215 }
1216
1217 // Release dummy at bottom of old generation
1218 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1219
1220 // Release dummy at bottom of permanent generation
1221 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1222 }
1223 return true;
1224 }
1225
1226 #endif // ASSERT