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