1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "aot/aotLoader.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/classLoaderData.hpp"
29 #include "classfile/javaClasses.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/vmSymbols.hpp"
33 #include "code/codeCache.hpp"
34 #include "code/dependencies.hpp"
35 #include "gc/shared/collectedHeap.inline.hpp"
36 #include "gc/shared/gcArguments.hpp"
37 #include "gc/shared/gcConfig.hpp"
38 #include "gc/shared/gcTraceTime.inline.hpp"
39 #include "interpreter/interpreter.hpp"
40 #include "logging/log.hpp"
41 #include "logging/logStream.hpp"
42 #include "memory/filemap.hpp"
43 #include "memory/metadataFactory.hpp"
44 #include "memory/metaspaceClosure.hpp"
45 #include "memory/metaspaceCounters.hpp"
46 #include "memory/metaspaceShared.hpp"
47 #include "memory/oopFactory.hpp"
48 #include "memory/resourceArea.hpp"
49 #include "memory/universe.hpp"
50 #include "memory/universe.hpp"
51 #include "oops/constantPool.hpp"
52 #include "oops/instanceClassLoaderKlass.hpp"
53 #include "oops/instanceKlass.hpp"
54 #include "oops/instanceMirrorKlass.hpp"
55 #include "oops/instanceRefKlass.hpp"
56 #include "oops/objArrayOop.inline.hpp"
57 #include "oops/oop.inline.hpp"
58 #include "oops/typeArrayKlass.hpp"
59 #include "prims/resolvedMethodTable.hpp"
60 #include "runtime/arguments.hpp"
61 #include "runtime/atomic.hpp"
62 #include "runtime/flags/flagSetting.hpp"
63 #include "runtime/flags/jvmFlagConstraintList.hpp"
64 #include "runtime/deoptimization.hpp"
65 #include "runtime/handles.inline.hpp"
66 #include "runtime/init.hpp"
67 #include "runtime/java.hpp"
68 #include "runtime/javaCalls.hpp"
69 #include "runtime/sharedRuntime.hpp"
70 #include "runtime/synchronizer.hpp"
71 #include "runtime/thread.inline.hpp"
72 #include "runtime/timerTrace.hpp"
73 #include "runtime/vm_operations.hpp"
74 #include "services/memoryService.hpp"
75 #include "utilities/align.hpp"
76 #include "utilities/copy.hpp"
77 #include "utilities/debug.hpp"
78 #include "utilities/events.hpp"
79 #include "utilities/formatBuffer.hpp"
80 #include "utilities/hashtable.inline.hpp"
81 #include "utilities/macros.hpp"
82 #include "utilities/ostream.hpp"
83 #include "utilities/preserveException.hpp"
84
85 // Known objects
86 Klass* Universe::_typeArrayKlassObjs[T_LONG+1] = { NULL /*, NULL...*/ };
87 Klass* Universe::_objectArrayKlassObj = NULL;
88 oop Universe::_int_mirror = NULL;
89 oop Universe::_float_mirror = NULL;
90 oop Universe::_double_mirror = NULL;
91 oop Universe::_byte_mirror = NULL;
92 oop Universe::_bool_mirror = NULL;
93 oop Universe::_char_mirror = NULL;
94 oop Universe::_long_mirror = NULL;
95 oop Universe::_short_mirror = NULL;
96 oop Universe::_void_mirror = NULL;
97 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ };
98 oop Universe::_main_thread_group = NULL;
99 oop Universe::_system_thread_group = NULL;
100 objArrayOop Universe::_the_empty_class_klass_array = NULL;
101 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
102 oop Universe::_the_null_sentinel = NULL;
103 oop Universe::_the_null_string = NULL;
104 oop Universe::_the_min_jint_string = NULL;
105 LatestMethodCache* Universe::_finalizer_register_cache = NULL;
106 LatestMethodCache* Universe::_loader_addClass_cache = NULL;
107 LatestMethodCache* Universe::_pd_implies_cache = NULL;
108 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL;
109 LatestMethodCache* Universe::_do_stack_walk_cache = NULL;
110 oop Universe::_out_of_memory_error_java_heap = NULL;
111 oop Universe::_out_of_memory_error_metaspace = NULL;
112 oop Universe::_out_of_memory_error_class_metaspace = NULL;
113 oop Universe::_out_of_memory_error_array_size = NULL;
114 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL;
115 oop Universe::_out_of_memory_error_realloc_objects = NULL;
116 oop Universe::_delayed_stack_overflow_error_message = NULL;
117 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL;
118 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
119 bool Universe::_verify_in_progress = false;
120 long Universe::verify_flags = Universe::Verify_All;
121 oop Universe::_null_ptr_exception_instance = NULL;
122 oop Universe::_arithmetic_exception_instance = NULL;
123 oop Universe::_virtual_machine_error_instance = NULL;
124 oop Universe::_vm_exception = NULL;
125 oop Universe::_reference_pending_list = NULL;
126
127 Array<int>* Universe::_the_empty_int_array = NULL;
128 Array<u2>* Universe::_the_empty_short_array = NULL;
129 Array<Klass*>* Universe::_the_empty_klass_array = NULL;
130 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = NULL;
131 Array<Method*>* Universe::_the_empty_method_array = NULL;
132
133 // These variables are guarded by FullGCALot_lock.
134 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;)
135 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
136
137 // Heap
138 int Universe::_verify_count = 0;
139
140 // Oop verification (see MacroAssembler::verify_oop)
141 uintptr_t Universe::_verify_oop_mask = 0;
142 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
143
144 int Universe::_base_vtable_size = 0;
145 bool Universe::_bootstrapping = false;
146 bool Universe::_module_initialized = false;
147 bool Universe::_fully_initialized = false;
148
149 size_t Universe::_heap_capacity_at_last_gc;
150 size_t Universe::_heap_used_at_last_gc = 0;
151
152 CollectedHeap* Universe::_collectedHeap = NULL;
153
154 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true };
155 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true };
156 address Universe::_narrow_ptrs_base;
157 uint64_t Universe::_narrow_klass_range = (uint64_t(max_juint)+1);
158
159 void Universe::basic_type_classes_do(void f(Klass*)) {
160 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
161 f(_typeArrayKlassObjs[i]);
162 }
163 }
164
165 void Universe::basic_type_classes_do(KlassClosure *closure) {
166 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
167 closure->do_klass(_typeArrayKlassObjs[i]);
168 }
169 }
170
171 void Universe::oops_do(OopClosure* f) {
172
173 f->do_oop((oop*) &_int_mirror);
174 f->do_oop((oop*) &_float_mirror);
175 f->do_oop((oop*) &_double_mirror);
176 f->do_oop((oop*) &_byte_mirror);
177 f->do_oop((oop*) &_bool_mirror);
178 f->do_oop((oop*) &_char_mirror);
179 f->do_oop((oop*) &_long_mirror);
180 f->do_oop((oop*) &_short_mirror);
181 f->do_oop((oop*) &_void_mirror);
182
183 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
184 f->do_oop((oop*) &_mirrors[i]);
185 }
186 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
187
188 f->do_oop((oop*)&_the_empty_class_klass_array);
189 f->do_oop((oop*)&_the_null_sentinel);
190 f->do_oop((oop*)&_the_null_string);
191 f->do_oop((oop*)&_the_min_jint_string);
192 f->do_oop((oop*)&_out_of_memory_error_java_heap);
193 f->do_oop((oop*)&_out_of_memory_error_metaspace);
194 f->do_oop((oop*)&_out_of_memory_error_class_metaspace);
195 f->do_oop((oop*)&_out_of_memory_error_array_size);
196 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit);
197 f->do_oop((oop*)&_out_of_memory_error_realloc_objects);
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 _pd_implies_cache->metaspace_pointers_do(it);
230 _throw_illegal_access_error_cache->metaspace_pointers_do(it);
231 _do_stack_walk_cache->metaspace_pointers_do(it);
232 }
233
234 // Serialize metadata and pointers to primitive type mirrors in and out of CDS archive
235 void Universe::serialize(SerializeClosure* f) {
236
237 for (int i = 0; i < T_LONG+1; i++) {
238 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
239 }
240
241 f->do_ptr((void**)&_objectArrayKlassObj);
242 #if INCLUDE_CDS_JAVA_HEAP
243 // The mirrors are NULL if MetaspaceShared::is_heap_object_archiving_allowed
244 // is false.
245 f->do_oop(&_int_mirror);
246 f->do_oop(&_float_mirror);
247 f->do_oop(&_double_mirror);
248 f->do_oop(&_byte_mirror);
249 f->do_oop(&_bool_mirror);
250 f->do_oop(&_char_mirror);
251 f->do_oop(&_long_mirror);
252 f->do_oop(&_short_mirror);
253 f->do_oop(&_void_mirror);
254 #endif
255
256 f->do_ptr((void**)&_the_array_interfaces_array);
257 f->do_ptr((void**)&_the_empty_int_array);
258 f->do_ptr((void**)&_the_empty_short_array);
259 f->do_ptr((void**)&_the_empty_method_array);
260 f->do_ptr((void**)&_the_empty_klass_array);
261 f->do_ptr((void**)&_the_empty_instance_klass_array);
262 _finalizer_register_cache->serialize(f);
263 _loader_addClass_cache->serialize(f);
264 _pd_implies_cache->serialize(f);
265 _throw_illegal_access_error_cache->serialize(f);
266 _do_stack_walk_cache->serialize(f);
267 }
268
269 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
270 if (size < alignment || size % alignment != 0) {
271 vm_exit_during_initialization(
272 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
273 }
274 }
275
276 void initialize_basic_type_klass(Klass* k, TRAPS) {
277 Klass* ok = SystemDictionary::Object_klass();
278 #if INCLUDE_CDS
279 if (UseSharedSpaces) {
280 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
281 assert(k->super() == ok, "u3");
282 k->restore_unshareable_info(loader_data, Handle(), CHECK);
283 } else
284 #endif
285 {
286 k->initialize_supers(ok, NULL, CHECK);
287 }
288 k->append_to_sibling_list();
289 }
290
291 void Universe::genesis(TRAPS) {
292 ResourceMark rm;
293
294 { FlagSetting fs(_bootstrapping, true);
295
296 { MutexLocker mc(Compile_lock);
297
298 java_lang_Class::allocate_fixup_lists();
299
300 // determine base vtable size; without that we cannot create the array klasses
301 compute_base_vtable_size();
302
303 if (!UseSharedSpaces) {
304 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
305 _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK);
306 }
307
308 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
309
310 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
311 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
312 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
313 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
314 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
315 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK);
316 }
317 }
318
319 vmSymbols::initialize(CHECK);
320
321 SystemDictionary::initialize(CHECK);
322
323 Klass* ok = SystemDictionary::Object_klass();
324
325 _the_null_string = StringTable::intern("null", CHECK);
326 _the_min_jint_string = StringTable::intern("-2147483648", CHECK);
327
328 #if INCLUDE_CDS
329 if (UseSharedSpaces) {
330 // Verify shared interfaces array.
331 assert(_the_array_interfaces_array->at(0) ==
332 SystemDictionary::Cloneable_klass(), "u3");
333 assert(_the_array_interfaces_array->at(1) ==
334 SystemDictionary::Serializable_klass(), "u3");
335 } else
336 #endif
337 {
338 // Set up shared interfaces array. (Do this before supers are set up.)
339 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
340 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
341 }
342
343 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
344 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
345 initialize_basic_type_klass(floatArrayKlassObj(), CHECK);
346 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
347 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
348 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
349 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
350 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
351 } // end of core bootstrapping
352
353 {
354 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
355 _the_null_sentinel = tns();
356 }
357
358 // Maybe this could be lifted up now that object array can be initialized
359 // during the bootstrapping.
360
361 // OLD
362 // Initialize _objectArrayKlass after core bootstraping to make
363 // sure the super class is set up properly for _objectArrayKlass.
364 // ---
365 // NEW
366 // Since some of the old system object arrays have been converted to
367 // ordinary object arrays, _objectArrayKlass will be loaded when
368 // SystemDictionary::initialize(CHECK); is run. See the extra check
369 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
370 _objectArrayKlassObj = InstanceKlass::
371 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
372 // OLD
373 // Add the class to the class hierarchy manually to make sure that
374 // its vtable is initialized after core bootstrapping is completed.
375 // ---
376 // New
377 // Have already been initialized.
378 _objectArrayKlassObj->append_to_sibling_list();
379
380 #ifdef ASSERT
381 if (FullGCALot) {
382 // Allocate an array of dummy objects.
383 // We'd like these to be at the bottom of the old generation,
384 // so that when we free one and then collect,
385 // (almost) the whole heap moves
386 // and we find out if we actually update all the oops correctly.
387 // But we can't allocate directly in the old generation,
388 // so we allocate wherever, and hope that the first collection
389 // moves these objects to the bottom of the old generation.
390 // We can allocate directly in the permanent generation, so we do.
391 int size;
392 if (UseConcMarkSweepGC) {
393 log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate");
394 size = FullGCALotDummies;
395 } else {
396 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(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 void Universe::initialize_basic_type_mirrors(TRAPS) {
421 #if INCLUDE_CDS_JAVA_HEAP
422 if (UseSharedSpaces &&
423 MetaspaceShared::open_archive_heap_region_mapped() &&
424 _int_mirror != NULL) {
425 assert(MetaspaceShared::is_heap_object_archiving_allowed(), "Sanity");
426 assert(_float_mirror != NULL && _double_mirror != NULL &&
427 _byte_mirror != NULL && _byte_mirror != NULL &&
428 _bool_mirror != NULL && _char_mirror != NULL &&
429 _long_mirror != NULL && _short_mirror != NULL &&
430 _void_mirror != NULL, "Sanity");
431 } else
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(list, &_reference_pending_list);
519 }
520
521 #undef assert_pll_locked
522 #undef assert_pll_ownership
523
524 // initialize_vtable could cause gc if
525 // 1) we specified true to initialize_vtable and
526 // 2) this ran after gc was enabled
527 // In case those ever change we use handles for oops
528 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) {
529 // init vtable of k and all subclasses
530 ko->vtable().initialize_vtable(false, CHECK);
531 if (ko->is_instance_klass()) {
532 for (Klass* sk = ko->subklass();
533 sk != NULL;
534 sk = sk->next_sibling()) {
535 reinitialize_vtable_of(sk, CHECK);
536 }
537 }
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 ((!oopDesc::equals(throwable(), Universe::_out_of_memory_error_java_heap)) &&
564 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_metaspace)) &&
565 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_class_metaspace)) &&
566 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_array_size)) &&
567 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_gc_overhead_limit)) &&
568 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_realloc_objects)));
569 }
570
571
572 oop Universe::gen_out_of_memory_error(oop default_err) {
573 // generate an out of memory error:
574 // - if there is a preallocated error and stack traces are available
575 // (j.l.Throwable is initialized), then return the preallocated
576 // error with a filled in stack trace, and with the message
577 // provided by the default error.
578 // - otherwise, return the default error, without a stack trace.
579 int next;
580 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
581 SystemDictionary::Throwable_klass()->is_initialized()) {
582 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);
583 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
584 } else {
585 next = -1;
586 }
587 if (next < 0) {
588 // all preallocated errors have been used.
589 // return default
590 return default_err;
591 } else {
592 Thread* THREAD = Thread::current();
593 Handle default_err_h(THREAD, default_err);
594 // get the error object at the slot and set set it to NULL so that the
595 // array isn't keeping it alive anymore.
596 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next));
597 assert(exc() != NULL, "slot has been used already");
598 preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
599
600 // use the message from the default error
601 oop msg = java_lang_Throwable::message(default_err_h());
602 assert(msg != NULL, "no message");
603 java_lang_Throwable::set_message(exc(), msg);
604
605 // populate the stack trace and return it.
606 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
607 return exc();
608 }
609 }
610
611 intptr_t Universe::_non_oop_bits = 0;
612
613 void* Universe::non_oop_word() {
614 // Neither the high bits nor the low bits of this value is allowed
615 // to look like (respectively) the high or low bits of a real oop.
616 //
617 // High and low are CPU-specific notions, but low always includes
618 // the low-order bit. Since oops are always aligned at least mod 4,
619 // setting the low-order bit will ensure that the low half of the
620 // word will never look like that of a real oop.
621 //
622 // Using the OS-supplied non-memory-address word (usually 0 or -1)
623 // will take care of the high bits, however many there are.
624
625 if (_non_oop_bits == 0) {
626 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
627 }
628
629 return (void*)_non_oop_bits;
630 }
631
632 jint universe_init() {
633 assert(!Universe::_fully_initialized, "called after initialize_vtables");
634 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
635 "LogHeapWordSize is incorrect.");
636 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
637 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
638 "oop size is not not a multiple of HeapWord size");
639
640 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
641
642 JavaClasses::compute_hard_coded_offsets();
643
644 jint status = Universe::initialize_heap();
645 if (status != JNI_OK) {
646 return status;
647 }
648
649 SystemDictionary::initialize_oop_storage();
650
651 Metaspace::global_initialize();
652
653 // Initialize performance counters for metaspaces
654 MetaspaceCounters::initialize_performance_counters();
655 CompressedClassSpaceCounters::initialize_performance_counters();
656
657 AOTLoader::universe_init();
658
659 // Checks 'AfterMemoryInit' constraints.
660 if (!JVMFlagConstraintList::check_constraints(JVMFlagConstraint::AfterMemoryInit)) {
661 return JNI_EINVAL;
662 }
663
664 // Create memory for metadata. Must be after initializing heap for
665 // DumpSharedSpaces.
666 ClassLoaderData::init_null_class_loader_data();
667
668 // We have a heap so create the Method* caches before
669 // Metaspace::initialize_shared_spaces() tries to populate them.
670 Universe::_finalizer_register_cache = new LatestMethodCache();
671 Universe::_loader_addClass_cache = new LatestMethodCache();
672 Universe::_pd_implies_cache = new LatestMethodCache();
673 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
674 Universe::_do_stack_walk_cache = new LatestMethodCache();
675
676 #if INCLUDE_CDS
677 if (UseSharedSpaces) {
678 // Read the data structures supporting the shared spaces (shared
679 // system dictionary, symbol table, etc.). After that, access to
680 // the file (other than the mapped regions) is no longer needed, and
681 // the file is closed. Closing the file does not affect the
682 // currently mapped regions.
683 MetaspaceShared::initialize_shared_spaces();
684 StringTable::create_table();
685 } else
686 #endif
687 {
688 SymbolTable::create_table();
689 StringTable::create_table();
690
691 #if INCLUDE_CDS
692 if (DumpSharedSpaces) {
693 MetaspaceShared::prepare_for_dumping();
694 }
695 #endif
696 }
697 if (strlen(VerifySubSet) > 0) {
698 Universe::initialize_verify_flags();
699 }
700
701 ResolvedMethodTable::create_table();
702
703 return JNI_OK;
704 }
705
706 CollectedHeap* Universe::create_heap() {
707 assert(_collectedHeap == NULL, "Heap already created");
708 return GCConfig::arguments()->create_heap();
709 }
710
711 // Choose the heap base address and oop encoding mode
712 // when compressed oops are used:
713 // Unscaled - Use 32-bits oops without encoding when
714 // NarrowOopHeapBaseMin + heap_size < 4Gb
715 // ZeroBased - Use zero based compressed oops with encoding when
716 // NarrowOopHeapBaseMin + heap_size < 32Gb
717 // HeapBased - Use compressed oops with heap base + encoding.
718
719 jint Universe::initialize_heap() {
720 _collectedHeap = create_heap();
721 jint status = _collectedHeap->initialize();
722 if (status != JNI_OK) {
723 return status;
724 }
725 log_info(gc)("Using %s", _collectedHeap->name());
726
727 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
728
729 #ifdef _LP64
730 if (UseCompressedOops) {
731 // Subtract a page because something can get allocated at heap base.
732 // This also makes implicit null checking work, because the
733 // memory+1 page below heap_base needs to cause a signal.
734 // See needs_explicit_null_check.
735 // Only set the heap base for compressed oops because it indicates
736 // compressed oops for pstack code.
737 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) {
738 // Didn't reserve heap below 4Gb. Must shift.
739 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
740 }
741 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) {
742 // Did reserve heap below 32Gb. Can use base == 0;
743 Universe::set_narrow_oop_base(0);
744 }
745 AOTLoader::set_narrow_oop_shift();
746
747 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base());
748
749 LogTarget(Info, gc, heap, coops) lt;
750 if (lt.is_enabled()) {
751 ResourceMark rm;
752 LogStream ls(lt);
753 Universe::print_compressed_oops_mode(&ls);
754 }
755
756 // Tell tests in which mode we run.
757 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode",
758 narrow_oop_mode_to_string(narrow_oop_mode()),
759 false));
760 }
761 // Universe::narrow_oop_base() is one page below the heap.
762 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() -
763 os::vm_page_size()) ||
764 Universe::narrow_oop_base() == NULL, "invalid value");
765 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes ||
766 Universe::narrow_oop_shift() == 0, "invalid value");
767 #endif
768
769 // We will never reach the CATCH below since Exceptions::_throw will cause
770 // the VM to exit if an exception is thrown during initialization
771
772 if (UseTLAB) {
773 assert(Universe::heap()->supports_tlab_allocation(),
774 "Should support thread-local allocation buffers");
775 ThreadLocalAllocBuffer::startup_initialization();
776 }
777 return JNI_OK;
778 }
779
780 void Universe::print_compressed_oops_mode(outputStream* st) {
781 st->print("Heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
782 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M);
783
784 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode()));
785
786 if (Universe::narrow_oop_base() != 0) {
787 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base()));
788 }
789
790 if (Universe::narrow_oop_shift() != 0) {
791 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
792 }
793
794 if (!Universe::narrow_oop_use_implicit_null_checks()) {
795 st->print(", no protected page in front of the heap");
796 }
797 st->cr();
798 }
799
800 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
801
802 assert(alignment <= Arguments::conservative_max_heap_alignment(),
803 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
804 alignment, Arguments::conservative_max_heap_alignment());
805
806 size_t total_reserved = align_up(heap_size, alignment);
807 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
808 "heap size is too big for compressed oops");
809
810 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size());
811 assert(!UseLargePages
812 || UseParallelGC
813 || use_large_pages, "Wrong alignment to use large pages");
814
815 // Now create the space.
816 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt);
817
818 if (total_rs.is_reserved()) {
819 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
820 "must be exactly of required size and alignment");
821 // We are good.
822
823 if (UseCompressedOops) {
824 // Universe::initialize_heap() will reset this to NULL if unscaled
825 // or zero-based narrow oops are actually used.
826 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
827 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
828 }
829
830 if (AllocateHeapAt != NULL) {
831 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
832 }
833 return total_rs;
834 }
835
836 vm_exit_during_initialization(
837 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
838 total_reserved/K));
839
840 // satisfy compiler
841 ShouldNotReachHere();
842 return ReservedHeapSpace(0, 0, false);
843 }
844
845
846 // It's the caller's responsibility to ensure glitch-freedom
847 // (if required).
848 void Universe::update_heap_info_at_gc() {
849 _heap_capacity_at_last_gc = heap()->capacity();
850 _heap_used_at_last_gc = heap()->used();
851 }
852
853
854 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) {
855 switch (mode) {
856 case UnscaledNarrowOop:
857 return "32-bit";
858 case ZeroBasedNarrowOop:
859 return "Zero based";
860 case DisjointBaseNarrowOop:
861 return "Non-zero disjoint base";
862 case HeapBasedNarrowOop:
863 return "Non-zero based";
864 default:
865 ShouldNotReachHere();
866 return "";
867 }
868 }
869
870
871 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() {
872 if (narrow_oop_base_disjoint()) {
873 return DisjointBaseNarrowOop;
874 }
875
876 if (narrow_oop_base() != 0) {
877 return HeapBasedNarrowOop;
878 }
879
880 if (narrow_oop_shift() != 0) {
881 return ZeroBasedNarrowOop;
882 }
883
884 return UnscaledNarrowOop;
885 }
886
887 void initialize_known_method(LatestMethodCache* method_cache,
888 InstanceKlass* ik,
889 const char* method,
890 Symbol* signature,
891 bool is_static, TRAPS)
892 {
893 TempNewSymbol name = SymbolTable::new_symbol(method, CHECK);
894 Method* m = NULL;
895 // The klass must be linked before looking up the method.
896 if (!ik->link_class_or_fail(THREAD) ||
897 ((m = ik->find_method(name, signature)) == NULL) ||
898 is_static != m->is_static()) {
899 ResourceMark rm(THREAD);
900 // NoSuchMethodException doesn't actually work because it tries to run the
901 // <init> function before java_lang_Class is linked. Print error and exit.
902 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
903 ik->name()->as_C_string(), method));
904 }
905 method_cache->init(ik, m);
906 }
907
908 void Universe::initialize_known_methods(TRAPS) {
909 // Set up static method for registering finalizers
910 initialize_known_method(_finalizer_register_cache,
911 SystemDictionary::Finalizer_klass(),
912 "register",
913 vmSymbols::object_void_signature(), true, CHECK);
914
915 initialize_known_method(_throw_illegal_access_error_cache,
916 SystemDictionary::internal_Unsafe_klass(),
917 "throwIllegalAccessError",
918 vmSymbols::void_method_signature(), true, CHECK);
919
920 // Set up method for registering loaded classes in class loader vector
921 initialize_known_method(_loader_addClass_cache,
922 SystemDictionary::ClassLoader_klass(),
923 "addClass",
924 vmSymbols::class_void_signature(), false, CHECK);
925
926 // Set up method for checking protection domain
927 initialize_known_method(_pd_implies_cache,
928 SystemDictionary::ProtectionDomain_klass(),
929 "impliesCreateAccessControlContext",
930 vmSymbols::void_boolean_signature(), false, CHECK);
931
932 // Set up method for stack walking
933 initialize_known_method(_do_stack_walk_cache,
934 SystemDictionary::AbstractStackWalker_klass(),
935 "doStackWalk",
936 vmSymbols::doStackWalk_signature(), false, CHECK);
937 }
938
939 void universe2_init() {
940 EXCEPTION_MARK;
941 Universe::genesis(CATCH);
942 }
943
944 // Set after initialization of the module runtime, call_initModuleRuntime
945 void universe_post_module_init() {
946 Universe::_module_initialized = true;
947 }
948
949 bool universe_post_init() {
950 assert(!is_init_completed(), "Error: initialization not yet completed!");
951 Universe::_fully_initialized = true;
952 EXCEPTION_MARK;
953 { ResourceMark rm;
954 Interpreter::initialize(); // needed for interpreter entry points
955 if (!UseSharedSpaces) {
956 HandleMark hm(THREAD);
957 Klass* ok = SystemDictionary::Object_klass();
958 Universe::reinitialize_vtable_of(ok, CHECK_false);
959 Universe::reinitialize_itables(CHECK_false);
960 }
961 }
962
963 HandleMark hm(THREAD);
964 // Setup preallocated empty java.lang.Class array
965 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
966
967 // Setup preallocated OutOfMemoryError errors
968 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
969 InstanceKlass* ik = InstanceKlass::cast(k);
970 Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false);
971 Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false);
972 Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false);
973 Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false);
974 Universe::_out_of_memory_error_gc_overhead_limit =
975 ik->allocate_instance(CHECK_false);
976 Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false);
977
978 // Setup preallocated cause message for delayed StackOverflowError
979 if (StackReservedPages > 0) {
980 Universe::_delayed_stack_overflow_error_message =
981 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
982 }
983
984 // Setup preallocated NullPointerException
985 // (this is currently used for a cheap & dirty solution in compiler exception handling)
986 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
987 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
988 // Setup preallocated ArithmeticException
989 // (this is currently used for a cheap & dirty solution in compiler exception handling)
990 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
991 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
992 // Virtual Machine Error for when we get into a situation we can't resolve
993 k = SystemDictionary::resolve_or_fail(
994 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
995 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
996 if (!linked) {
997 tty->print_cr("Unable to link/verify VirtualMachineError class");
998 return false; // initialization failed
999 }
1000 Universe::_virtual_machine_error_instance =
1001 InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1002
1003 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1004
1005 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
1006 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
1007
1008 msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
1009 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
1010 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
1011 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
1012
1013 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
1014 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
1015
1016 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
1017 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
1018
1019 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false);
1020 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg());
1021
1022 msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1023 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
1024
1025 // Setup the array of errors that have preallocated backtrace
1026 k = Universe::_out_of_memory_error_java_heap->klass();
1027 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
1028 ik = InstanceKlass::cast(k);
1029
1030 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
1031 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false);
1032 for (int i=0; i<len; i++) {
1033 oop err = ik->allocate_instance(CHECK_false);
1034 Handle err_h = Handle(THREAD, err);
1035 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
1036 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
1037 }
1038 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
1039
1040 Universe::initialize_known_methods(CHECK_false);
1041
1042 // This needs to be done before the first scavenge/gc, since
1043 // it's an input to soft ref clearing policy.
1044 {
1045 MutexLocker x(Heap_lock);
1046 Universe::update_heap_info_at_gc();
1047 }
1048
1049 // ("weak") refs processing infrastructure initialization
1050 Universe::heap()->post_initialize();
1051
1052 MemoryService::add_metaspace_memory_pools();
1053
1054 MemoryService::set_universe_heap(Universe::heap());
1055 #if INCLUDE_CDS
1056 MetaspaceShared::post_initialize(CHECK_false);
1057 #endif
1058 return true;
1059 }
1060
1061
1062 void Universe::compute_base_vtable_size() {
1063 _base_vtable_size = ClassLoader::compute_Object_vtable();
1064 }
1065
1066 void Universe::print_on(outputStream* st) {
1067 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1068 st->print_cr("Heap");
1069 heap()->print_on(st);
1070 }
1071
1072 void Universe::print_heap_at_SIGBREAK() {
1073 if (PrintHeapAtSIGBREAK) {
1074 print_on(tty);
1075 tty->cr();
1076 tty->flush();
1077 }
1078 }
1079
1080 void Universe::print_heap_before_gc() {
1081 LogTarget(Debug, gc, heap) lt;
1082 if (lt.is_enabled()) {
1083 LogStream ls(lt);
1084 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1085 ResourceMark rm;
1086 heap()->print_on(&ls);
1087 }
1088 }
1089
1090 void Universe::print_heap_after_gc() {
1091 LogTarget(Debug, gc, heap) lt;
1092 if (lt.is_enabled()) {
1093 LogStream ls(lt);
1094 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1095 ResourceMark rm;
1096 heap()->print_on(&ls);
1097 }
1098 }
1099
1100 void Universe::initialize_verify_flags() {
1101 verify_flags = 0;
1102 const char delimiter[] = " ,";
1103
1104 size_t length = strlen(VerifySubSet);
1105 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1106 strncpy(subset_list, VerifySubSet, length + 1);
1107
1108 char* token = strtok(subset_list, delimiter);
1109 while (token != NULL) {
1110 if (strcmp(token, "threads") == 0) {
1111 verify_flags |= Verify_Threads;
1112 } else if (strcmp(token, "heap") == 0) {
1113 verify_flags |= Verify_Heap;
1114 } else if (strcmp(token, "symbol_table") == 0) {
1115 verify_flags |= Verify_SymbolTable;
1116 } else if (strcmp(token, "string_table") == 0) {
1117 verify_flags |= Verify_StringTable;
1118 } else if (strcmp(token, "codecache") == 0) {
1119 verify_flags |= Verify_CodeCache;
1120 } else if (strcmp(token, "dictionary") == 0) {
1121 verify_flags |= Verify_SystemDictionary;
1122 } else if (strcmp(token, "classloader_data_graph") == 0) {
1123 verify_flags |= Verify_ClassLoaderDataGraph;
1124 } else if (strcmp(token, "metaspace") == 0) {
1125 verify_flags |= Verify_MetaspaceUtils;
1126 } else if (strcmp(token, "jni_handles") == 0) {
1127 verify_flags |= Verify_JNIHandles;
1128 } else if (strcmp(token, "codecache_oops") == 0) {
1129 verify_flags |= Verify_CodeCacheOops;
1130 } else {
1131 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1132 }
1133 token = strtok(NULL, delimiter);
1134 }
1135 FREE_C_HEAP_ARRAY(char, subset_list);
1136 }
1137
1138 bool Universe::should_verify_subset(uint subset) {
1139 if (verify_flags & subset) {
1140 return true;
1141 }
1142 return false;
1143 }
1144
1145 void Universe::verify(VerifyOption option, const char* prefix) {
1146 // The use of _verify_in_progress is a temporary work around for
1147 // 6320749. Don't bother with a creating a class to set and clear
1148 // it since it is only used in this method and the control flow is
1149 // straight forward.
1150 _verify_in_progress = true;
1151
1152 COMPILER2_PRESENT(
1153 assert(!DerivedPointerTable::is_active(),
1154 "DPT should not be active during verification "
1155 "(of thread stacks below)");
1156 )
1157
1158 ResourceMark rm;
1159 HandleMark hm; // Handles created during verification can be zapped
1160 _verify_count++;
1161
1162 FormatBuffer<> title("Verifying %s", prefix);
1163 GCTraceTime(Info, gc, verify) tm(title.buffer());
1164 if (should_verify_subset(Verify_Threads)) {
1165 log_debug(gc, verify)("Threads");
1166 Threads::verify();
1167 }
1168 if (should_verify_subset(Verify_Heap)) {
1169 log_debug(gc, verify)("Heap");
1170 heap()->verify(option);
1171 }
1172 if (should_verify_subset(Verify_SymbolTable)) {
1173 log_debug(gc, verify)("SymbolTable");
1174 SymbolTable::verify();
1175 }
1176 if (should_verify_subset(Verify_StringTable)) {
1177 log_debug(gc, verify)("StringTable");
1178 StringTable::verify();
1179 }
1180 if (should_verify_subset(Verify_CodeCache)) {
1181 {
1182 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1183 log_debug(gc, verify)("CodeCache");
1184 CodeCache::verify();
1185 }
1186 }
1187 if (should_verify_subset(Verify_SystemDictionary)) {
1188 log_debug(gc, verify)("SystemDictionary");
1189 SystemDictionary::verify();
1190 }
1191 #ifndef PRODUCT
1192 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1193 log_debug(gc, verify)("ClassLoaderDataGraph");
1194 ClassLoaderDataGraph::verify();
1195 }
1196 #endif
1197 if (should_verify_subset(Verify_MetaspaceUtils)) {
1198 log_debug(gc, verify)("MetaspaceUtils");
1199 MetaspaceUtils::verify_free_chunks();
1200 }
1201 if (should_verify_subset(Verify_JNIHandles)) {
1202 log_debug(gc, verify)("JNIHandles");
1203 JNIHandles::verify();
1204 }
1205 if (should_verify_subset(Verify_CodeCacheOops)) {
1206 log_debug(gc, verify)("CodeCache Oops");
1207 CodeCache::verify_oops();
1208 }
1209
1210 _verify_in_progress = false;
1211 }
1212
1213
1214 #ifndef PRODUCT
1215 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1216 assert(low_boundary < high_boundary, "bad interval");
1217
1218 // decide which low-order bits we require to be clear:
1219 size_t alignSize = MinObjAlignmentInBytes;
1220 size_t min_object_size = CollectedHeap::min_fill_size();
1221
1222 // make an inclusive limit:
1223 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1224 uintptr_t min = (uintptr_t)low_boundary;
1225 assert(min < max, "bad interval");
1226 uintptr_t diff = max ^ min;
1227
1228 // throw away enough low-order bits to make the diff vanish
1229 uintptr_t mask = (uintptr_t)(-1);
1230 while ((mask & diff) != 0)
1231 mask <<= 1;
1232 uintptr_t bits = (min & mask);
1233 assert(bits == (max & mask), "correct mask");
1234 // check an intermediate value between min and max, just to make sure:
1235 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1236
1237 // require address alignment, too:
1238 mask |= (alignSize - 1);
1239
1240 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1241 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1242 }
1243 _verify_oop_mask = mask;
1244 _verify_oop_bits = bits;
1245 }
1246
1247 // Oop verification (see MacroAssembler::verify_oop)
1248
1249 uintptr_t Universe::verify_oop_mask() {
1250 MemRegion m = heap()->reserved_region();
1251 calculate_verify_data(m.start(), m.end());
1252 return _verify_oop_mask;
1253 }
1254
1255 uintptr_t Universe::verify_oop_bits() {
1256 MemRegion m = heap()->reserved_region();
1257 calculate_verify_data(m.start(), m.end());
1258 return _verify_oop_bits;
1259 }
1260
1261 uintptr_t Universe::verify_mark_mask() {
1262 return markOopDesc::lock_mask_in_place;
1263 }
1264
1265 uintptr_t Universe::verify_mark_bits() {
1266 intptr_t mask = verify_mark_mask();
1267 intptr_t bits = (intptr_t)markOopDesc::prototype();
1268 assert((bits & ~mask) == 0, "no stray header bits");
1269 return bits;
1270 }
1271 #endif // PRODUCT
1272
1273
1274 void Universe::compute_verify_oop_data() {
1275 verify_oop_mask();
1276 verify_oop_bits();
1277 verify_mark_mask();
1278 verify_mark_bits();
1279 }
1280
1281
1282 void LatestMethodCache::init(Klass* k, Method* m) {
1283 if (!UseSharedSpaces) {
1284 _klass = k;
1285 }
1286 #ifndef PRODUCT
1287 else {
1288 // sharing initilization should have already set up _klass
1289 assert(_klass != NULL, "just checking");
1290 }
1291 #endif
1292
1293 _method_idnum = m->method_idnum();
1294 assert(_method_idnum >= 0, "sanity check");
1295 }
1296
1297
1298 Method* LatestMethodCache::get_method() {
1299 if (klass() == NULL) return NULL;
1300 InstanceKlass* ik = InstanceKlass::cast(klass());
1301 Method* m = ik->method_with_idnum(method_idnum());
1302 assert(m != NULL, "sanity check");
1303 return m;
1304 }
1305
1306
1307 #ifdef ASSERT
1308 // Release dummy object(s) at bottom of heap
1309 bool Universe::release_fullgc_alot_dummy() {
1310 MutexLocker ml(FullGCALot_lock);
1311 if (_fullgc_alot_dummy_array != NULL) {
1312 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
1313 // No more dummies to release, release entire array instead
1314 _fullgc_alot_dummy_array = NULL;
1315 return false;
1316 }
1317 if (!UseConcMarkSweepGC) {
1318 // Release dummy at bottom of old generation
1319 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1320 }
1321 // Release dummy at bottom of permanent generation
1322 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1323 }
1324 return true;
1325 }
1326
1327 #endif // ASSERT