1 /*
2 * Copyright (c) 1997, 2017, 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/cardTableModRefBS.hpp"
36 #include "gc/shared/collectedHeap.inline.hpp"
37 #include "gc/shared/gcArguments.hpp"
38 #include "gc/shared/gcLocker.inline.hpp"
39 #include "gc/shared/generation.hpp"
40 #include "gc/shared/gcTraceTime.inline.hpp"
41 #include "gc/shared/space.hpp"
42 #include "interpreter/interpreter.hpp"
43 #include "logging/log.hpp"
44 #include "logging/logStream.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 "memory/universe.inline.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/commandLineFlagConstraintList.hpp"
66 #include "runtime/deoptimization.hpp"
67 #include "runtime/handles.inline.hpp"
68 #include "runtime/init.hpp"
69 #include "runtime/java.hpp"
70 #include "runtime/javaCalls.hpp"
71 #include "runtime/sharedRuntime.hpp"
72 #include "runtime/synchronizer.hpp"
73 #include "runtime/thread.inline.hpp"
74 #include "runtime/timerTrace.hpp"
75 #include "runtime/vm_operations.hpp"
76 #include "services/memoryService.hpp"
77 #include "utilities/align.hpp"
78 #include "utilities/copy.hpp"
79 #include "utilities/debug.hpp"
80 #include "utilities/events.hpp"
81 #include "utilities/formatBuffer.hpp"
82 #include "utilities/hashtable.inline.hpp"
83 #include "utilities/macros.hpp"
84 #include "utilities/ostream.hpp"
85 #include "utilities/preserveException.hpp"
86 #if INCLUDE_CDS
87 #include "classfile/sharedClassUtil.hpp"
88 #endif
89
90 // Known objects
91 Klass* Universe::_boolArrayKlassObj = NULL;
92 Klass* Universe::_byteArrayKlassObj = NULL;
93 Klass* Universe::_charArrayKlassObj = NULL;
94 Klass* Universe::_intArrayKlassObj = NULL;
95 Klass* Universe::_shortArrayKlassObj = NULL;
96 Klass* Universe::_longArrayKlassObj = NULL;
97 Klass* Universe::_singleArrayKlassObj = NULL;
98 Klass* Universe::_doubleArrayKlassObj = NULL;
99 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ };
100 Klass* Universe::_objectArrayKlassObj = NULL;
101 oop Universe::_int_mirror = NULL;
102 oop Universe::_float_mirror = NULL;
103 oop Universe::_double_mirror = NULL;
104 oop Universe::_byte_mirror = NULL;
105 oop Universe::_bool_mirror = NULL;
106 oop Universe::_char_mirror = NULL;
107 oop Universe::_long_mirror = NULL;
108 oop Universe::_short_mirror = NULL;
109 oop Universe::_void_mirror = NULL;
110 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ };
111 oop Universe::_main_thread_group = NULL;
112 oop Universe::_system_thread_group = NULL;
113 objArrayOop Universe::_the_empty_class_klass_array = NULL;
114 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
115 oop Universe::_the_null_string = NULL;
116 oop Universe::_the_min_jint_string = NULL;
117 LatestMethodCache* Universe::_finalizer_register_cache = NULL;
118 LatestMethodCache* Universe::_loader_addClass_cache = NULL;
119 LatestMethodCache* Universe::_pd_implies_cache = NULL;
120 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL;
121 LatestMethodCache* Universe::_do_stack_walk_cache = NULL;
122 oop Universe::_out_of_memory_error_java_heap = NULL;
123 oop Universe::_out_of_memory_error_metaspace = NULL;
124 oop Universe::_out_of_memory_error_class_metaspace = NULL;
125 oop Universe::_out_of_memory_error_array_size = NULL;
126 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL;
127 oop Universe::_out_of_memory_error_realloc_objects = NULL;
128 oop Universe::_delayed_stack_overflow_error_message = NULL;
129 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL;
130 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
131 bool Universe::_verify_in_progress = false;
132 long Universe::verify_flags = Universe::Verify_All;
133 oop Universe::_null_ptr_exception_instance = NULL;
134 oop Universe::_arithmetic_exception_instance = NULL;
135 oop Universe::_virtual_machine_error_instance = NULL;
136 oop Universe::_vm_exception = NULL;
137 oop Universe::_allocation_context_notification_obj = NULL;
138 oop Universe::_reference_pending_list = NULL;
139
140 Array<int>* Universe::_the_empty_int_array = NULL;
141 Array<u2>* Universe::_the_empty_short_array = NULL;
142 Array<Klass*>* Universe::_the_empty_klass_array = NULL;
143 Array<Method*>* Universe::_the_empty_method_array = NULL;
144
145 // These variables are guarded by FullGCALot_lock.
146 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;)
147 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
148
149 // Heap
150 int Universe::_verify_count = 0;
151
152 // Oop verification (see MacroAssembler::verify_oop)
153 uintptr_t Universe::_verify_oop_mask = 0;
154 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
155
156 int Universe::_base_vtable_size = 0;
157 bool Universe::_bootstrapping = false;
158 bool Universe::_module_initialized = false;
159 bool Universe::_fully_initialized = false;
160
161 size_t Universe::_heap_capacity_at_last_gc;
162 size_t Universe::_heap_used_at_last_gc = 0;
163
164 CollectedHeap* Universe::_collectedHeap = NULL;
165
166 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true };
167 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true };
168 address Universe::_narrow_ptrs_base;
169
170 void Universe::basic_type_classes_do(void f(Klass*)) {
171 f(boolArrayKlassObj());
172 f(byteArrayKlassObj());
173 f(charArrayKlassObj());
174 f(intArrayKlassObj());
175 f(shortArrayKlassObj());
176 f(longArrayKlassObj());
177 f(singleArrayKlassObj());
178 f(doubleArrayKlassObj());
179 }
180
181 void Universe::oops_do(OopClosure* f, bool do_all) {
182
183 f->do_oop((oop*) &_int_mirror);
184 f->do_oop((oop*) &_float_mirror);
185 f->do_oop((oop*) &_double_mirror);
186 f->do_oop((oop*) &_byte_mirror);
187 f->do_oop((oop*) &_bool_mirror);
188 f->do_oop((oop*) &_char_mirror);
189 f->do_oop((oop*) &_long_mirror);
190 f->do_oop((oop*) &_short_mirror);
191 f->do_oop((oop*) &_void_mirror);
192
193 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
194 f->do_oop((oop*) &_mirrors[i]);
195 }
196 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
197
198 f->do_oop((oop*)&_the_empty_class_klass_array);
199 f->do_oop((oop*)&_the_null_string);
200 f->do_oop((oop*)&_the_min_jint_string);
201 f->do_oop((oop*)&_out_of_memory_error_java_heap);
202 f->do_oop((oop*)&_out_of_memory_error_metaspace);
203 f->do_oop((oop*)&_out_of_memory_error_class_metaspace);
204 f->do_oop((oop*)&_out_of_memory_error_array_size);
205 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit);
206 f->do_oop((oop*)&_out_of_memory_error_realloc_objects);
207 f->do_oop((oop*)&_delayed_stack_overflow_error_message);
208 f->do_oop((oop*)&_preallocated_out_of_memory_error_array);
209 f->do_oop((oop*)&_null_ptr_exception_instance);
210 f->do_oop((oop*)&_arithmetic_exception_instance);
211 f->do_oop((oop*)&_virtual_machine_error_instance);
212 f->do_oop((oop*)&_main_thread_group);
213 f->do_oop((oop*)&_system_thread_group);
214 f->do_oop((oop*)&_vm_exception);
215 f->do_oop((oop*)&_allocation_context_notification_obj);
216 f->do_oop((oop*)&_reference_pending_list);
217 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);)
218 }
219
220 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
221 it->push(&_klass);
222 }
223
224 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
225 it->push(&_boolArrayKlassObj);
226 it->push(&_byteArrayKlassObj);
227 it->push(&_charArrayKlassObj);
228 it->push(&_intArrayKlassObj);
229 it->push(&_shortArrayKlassObj);
230 it->push(&_longArrayKlassObj);
231 it->push(&_singleArrayKlassObj);
232 it->push(&_doubleArrayKlassObj);
233 for (int i = 0; i < T_VOID+1; i++) {
234 it->push(&_typeArrayKlassObjs[i]);
235 }
236 it->push(&_objectArrayKlassObj);
237
238 it->push(&_the_empty_int_array);
239 it->push(&_the_empty_short_array);
240 it->push(&_the_empty_klass_array);
241 it->push(&_the_empty_method_array);
242 it->push(&_the_array_interfaces_array);
243
244 _finalizer_register_cache->metaspace_pointers_do(it);
245 _loader_addClass_cache->metaspace_pointers_do(it);
246 _pd_implies_cache->metaspace_pointers_do(it);
247 _throw_illegal_access_error_cache->metaspace_pointers_do(it);
248 _do_stack_walk_cache->metaspace_pointers_do(it);
249 }
250
251 // Serialize metadata in and out of CDS archive, not oops.
252 void Universe::serialize(SerializeClosure* f, bool do_all) {
253
254 f->do_ptr((void**)&_boolArrayKlassObj);
255 f->do_ptr((void**)&_byteArrayKlassObj);
256 f->do_ptr((void**)&_charArrayKlassObj);
257 f->do_ptr((void**)&_intArrayKlassObj);
258 f->do_ptr((void**)&_shortArrayKlassObj);
259 f->do_ptr((void**)&_longArrayKlassObj);
260 f->do_ptr((void**)&_singleArrayKlassObj);
261 f->do_ptr((void**)&_doubleArrayKlassObj);
262 f->do_ptr((void**)&_objectArrayKlassObj);
263
264 {
265 for (int i = 0; i < T_VOID+1; i++) {
266 if (_typeArrayKlassObjs[i] != NULL) {
267 assert(i >= T_BOOLEAN, "checking");
268 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
269 } else if (do_all) {
270 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
271 }
272 }
273 }
274
275 f->do_ptr((void**)&_the_array_interfaces_array);
276 f->do_ptr((void**)&_the_empty_int_array);
277 f->do_ptr((void**)&_the_empty_short_array);
278 f->do_ptr((void**)&_the_empty_method_array);
279 f->do_ptr((void**)&_the_empty_klass_array);
280 _finalizer_register_cache->serialize(f);
281 _loader_addClass_cache->serialize(f);
282 _pd_implies_cache->serialize(f);
283 _throw_illegal_access_error_cache->serialize(f);
284 _do_stack_walk_cache->serialize(f);
285 }
286
287 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
288 if (size < alignment || size % alignment != 0) {
289 vm_exit_during_initialization(
290 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
291 }
292 }
293
294 void initialize_basic_type_klass(Klass* k, TRAPS) {
295 Klass* ok = SystemDictionary::Object_klass();
296 #if INCLUDE_CDS
297 if (UseSharedSpaces) {
298 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
299 assert(k->super() == ok, "u3");
300 k->restore_unshareable_info(loader_data, Handle(), CHECK);
301 } else
302 #endif
303 {
304 k->initialize_supers(ok, CHECK);
305 }
306 k->append_to_sibling_list();
307 }
308
309 void Universe::genesis(TRAPS) {
310 ResourceMark rm;
311
312 { FlagSetting fs(_bootstrapping, true);
313
314 { MutexLocker mc(Compile_lock);
315
316 java_lang_Class::allocate_fixup_lists();
317
318 // determine base vtable size; without that we cannot create the array klasses
319 compute_base_vtable_size();
320
321 if (!UseSharedSpaces) {
322 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK);
323 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK);
324 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK);
325 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK);
326 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK);
327 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK);
328 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK);
329 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK);
330
331 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj;
332 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj;
333 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj;
334 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj;
335 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj;
336 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj;
337 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj;
338 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj;
339
340 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
341
342 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
343 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
344 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
345 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
346 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
347 }
348 }
349
350 vmSymbols::initialize(CHECK);
351
352 SystemDictionary::initialize(CHECK);
353
354 Klass* ok = SystemDictionary::Object_klass();
355
356 _the_null_string = StringTable::intern("null", CHECK);
357 _the_min_jint_string = StringTable::intern("-2147483648", CHECK);
358
359 #if INCLUDE_CDS
360 if (UseSharedSpaces) {
361 // Verify shared interfaces array.
362 assert(_the_array_interfaces_array->at(0) ==
363 SystemDictionary::Cloneable_klass(), "u3");
364 assert(_the_array_interfaces_array->at(1) ==
365 SystemDictionary::Serializable_klass(), "u3");
366 MetaspaceShared::fixup_mapped_heap_regions();
367 } else
368 #endif
369 {
370 // Set up shared interfaces array. (Do this before supers are set up.)
371 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
372 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
373 }
374
375 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
376 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
377 initialize_basic_type_klass(singleArrayKlassObj(), CHECK);
378 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
379 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
380 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
381 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
382 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
383 } // end of core bootstrapping
384
385 // Maybe this could be lifted up now that object array can be initialized
386 // during the bootstrapping.
387
388 // OLD
389 // Initialize _objectArrayKlass after core bootstraping to make
390 // sure the super class is set up properly for _objectArrayKlass.
391 // ---
392 // NEW
393 // Since some of the old system object arrays have been converted to
394 // ordinary object arrays, _objectArrayKlass will be loaded when
395 // SystemDictionary::initialize(CHECK); is run. See the extra check
396 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
397 _objectArrayKlassObj = InstanceKlass::
398 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
399 // OLD
400 // Add the class to the class hierarchy manually to make sure that
401 // its vtable is initialized after core bootstrapping is completed.
402 // ---
403 // New
404 // Have already been initialized.
405 _objectArrayKlassObj->append_to_sibling_list();
406
407 #ifdef ASSERT
408 if (FullGCALot) {
409 // Allocate an array of dummy objects.
410 // We'd like these to be at the bottom of the old generation,
411 // so that when we free one and then collect,
412 // (almost) the whole heap moves
413 // and we find out if we actually update all the oops correctly.
414 // But we can't allocate directly in the old generation,
415 // so we allocate wherever, and hope that the first collection
416 // moves these objects to the bottom of the old generation.
417 // We can allocate directly in the permanent generation, so we do.
418 int size;
419 if (UseConcMarkSweepGC) {
420 log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate");
421 size = FullGCALotDummies;
422 } else {
423 size = FullGCALotDummies * 2;
424 }
425 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
426 objArrayHandle dummy_array(THREAD, naked_array);
427 int i = 0;
428 while (i < size) {
429 // Allocate dummy in old generation
430 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK);
431 dummy_array->obj_at_put(i++, dummy);
432 }
433 {
434 // Only modify the global variable inside the mutex.
435 // If we had a race to here, the other dummy_array instances
436 // and their elements just get dropped on the floor, which is fine.
437 MutexLocker ml(FullGCALot_lock);
438 if (_fullgc_alot_dummy_array == NULL) {
439 _fullgc_alot_dummy_array = dummy_array();
440 }
441 }
442 assert(i == _fullgc_alot_dummy_array->length(), "just checking");
443 }
444 #endif
445
446 // Initialize dependency array for null class loader
447 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK);
448
449 }
450
451 void Universe::initialize_basic_type_mirrors(TRAPS) {
452 assert(_int_mirror==NULL, "basic type mirrors already initialized");
453 _int_mirror =
454 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK);
455 _float_mirror =
456 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK);
457 _double_mirror =
458 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK);
459 _byte_mirror =
460 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK);
461 _bool_mirror =
462 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
463 _char_mirror =
464 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK);
465 _long_mirror =
466 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK);
467 _short_mirror =
468 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK);
469 _void_mirror =
470 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK);
471
472 _mirrors[T_INT] = _int_mirror;
473 _mirrors[T_FLOAT] = _float_mirror;
474 _mirrors[T_DOUBLE] = _double_mirror;
475 _mirrors[T_BYTE] = _byte_mirror;
476 _mirrors[T_BOOLEAN] = _bool_mirror;
477 _mirrors[T_CHAR] = _char_mirror;
478 _mirrors[T_LONG] = _long_mirror;
479 _mirrors[T_SHORT] = _short_mirror;
480 _mirrors[T_VOID] = _void_mirror;
481 //_mirrors[T_OBJECT] = _object_klass->java_mirror();
482 //_mirrors[T_ARRAY] = _object_klass->java_mirror();
483 }
484
485 void Universe::fixup_mirrors(TRAPS) {
486 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
487 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
488 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
489 // that the number of objects allocated at this point is very small.
490 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
491 HandleMark hm(THREAD);
492 // Cache the start of the static fields
493 InstanceMirrorKlass::init_offset_of_static_fields();
494
495 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
496 int list_length = list->length();
497 for (int i = 0; i < list_length; i++) {
498 Klass* k = list->at(i);
499 assert(k->is_klass(), "List should only hold classes");
500 EXCEPTION_MARK;
501 java_lang_Class::fixup_mirror(k, CATCH);
502 }
503 delete java_lang_Class::fixup_mirror_list();
504 java_lang_Class::set_fixup_mirror_list(NULL);
505 }
506
507 #define assert_pll_locked(test) \
508 assert(Heap_lock->test(), "Reference pending list access requires lock")
509
510 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
511
512 oop Universe::reference_pending_list() {
513 if (Thread::current()->is_VM_thread()) {
514 assert_pll_locked(is_locked);
515 } else {
516 assert_pll_ownership();
517 }
518 return _reference_pending_list;
519 }
520
521 void Universe::set_reference_pending_list(oop list) {
522 assert_pll_ownership();
523 _reference_pending_list = list;
524 }
525
526 bool Universe::has_reference_pending_list() {
527 assert_pll_ownership();
528 return _reference_pending_list != NULL;
529 }
530
531 oop Universe::swap_reference_pending_list(oop list) {
532 assert_pll_locked(is_locked);
533 return Atomic::xchg(list, &_reference_pending_list);
534 }
535
536 #undef assert_pll_locked
537 #undef assert_pll_ownership
538
539
540 static bool has_run_finalizers_on_exit = false;
541
542 void Universe::run_finalizers_on_exit() {
543 if (has_run_finalizers_on_exit) return;
544 has_run_finalizers_on_exit = true;
545
546 // Called on VM exit. This ought to be run in a separate thread.
547 log_trace(ref)("Callback to run finalizers on exit");
548 {
549 PRESERVE_EXCEPTION_MARK;
550 Klass* finalizer_klass = SystemDictionary::Finalizer_klass();
551 JavaValue result(T_VOID);
552 JavaCalls::call_static(
553 &result,
554 finalizer_klass,
555 vmSymbols::run_finalizers_on_exit_name(),
556 vmSymbols::void_method_signature(),
557 THREAD
558 );
559 // Ignore any pending exceptions
560 CLEAR_PENDING_EXCEPTION;
561 }
562 }
563
564
565 // initialize_vtable could cause gc if
566 // 1) we specified true to initialize_vtable and
567 // 2) this ran after gc was enabled
568 // In case those ever change we use handles for oops
569 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) {
570 // init vtable of k and all subclasses
571 ko->vtable().initialize_vtable(false, CHECK);
572 if (ko->is_instance_klass()) {
573 for (Klass* sk = ko->subklass();
574 sk != NULL;
575 sk = sk->next_sibling()) {
576 reinitialize_vtable_of(sk, CHECK);
577 }
578 }
579 }
580
581
582 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) {
583 k->itable().initialize_itable(false, CHECK);
584 }
585
586
587 void Universe::reinitialize_itables(TRAPS) {
588 ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK);
589 }
590
591
592 bool Universe::on_page_boundary(void* addr) {
593 return is_aligned(addr, os::vm_page_size());
594 }
595
596
597 bool Universe::should_fill_in_stack_trace(Handle throwable) {
598 // never attempt to fill in the stack trace of preallocated errors that do not have
599 // backtrace. These errors are kept alive forever and may be "re-used" when all
600 // preallocated errors with backtrace have been consumed. Also need to avoid
601 // a potential loop which could happen if an out of memory occurs when attempting
602 // to allocate the backtrace.
603 return ((throwable() != Universe::_out_of_memory_error_java_heap) &&
604 (throwable() != Universe::_out_of_memory_error_metaspace) &&
605 (throwable() != Universe::_out_of_memory_error_class_metaspace) &&
606 (throwable() != Universe::_out_of_memory_error_array_size) &&
607 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) &&
608 (throwable() != Universe::_out_of_memory_error_realloc_objects));
609 }
610
611
612 oop Universe::gen_out_of_memory_error(oop default_err) {
613 // generate an out of memory error:
614 // - if there is a preallocated error and stack traces are available
615 // (j.l.Throwable is initialized), then return the preallocated
616 // error with a filled in stack trace, and with the message
617 // provided by the default error.
618 // - otherwise, return the default error, without a stack trace.
619 int next;
620 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
621 SystemDictionary::Throwable_klass()->is_initialized()) {
622 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);
623 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
624 } else {
625 next = -1;
626 }
627 if (next < 0) {
628 // all preallocated errors have been used.
629 // return default
630 return default_err;
631 } else {
632 Thread* THREAD = Thread::current();
633 Handle default_err_h(THREAD, default_err);
634 // get the error object at the slot and set set it to NULL so that the
635 // array isn't keeping it alive anymore.
636 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next));
637 assert(exc() != NULL, "slot has been used already");
638 preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
639
640 // use the message from the default error
641 oop msg = java_lang_Throwable::message(default_err_h());
642 assert(msg != NULL, "no message");
643 java_lang_Throwable::set_message(exc(), msg);
644
645 // populate the stack trace and return it.
646 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
647 return exc();
648 }
649 }
650
651 intptr_t Universe::_non_oop_bits = 0;
652
653 void* Universe::non_oop_word() {
654 // Neither the high bits nor the low bits of this value is allowed
655 // to look like (respectively) the high or low bits of a real oop.
656 //
657 // High and low are CPU-specific notions, but low always includes
658 // the low-order bit. Since oops are always aligned at least mod 4,
659 // setting the low-order bit will ensure that the low half of the
660 // word will never look like that of a real oop.
661 //
662 // Using the OS-supplied non-memory-address word (usually 0 or -1)
663 // will take care of the high bits, however many there are.
664
665 if (_non_oop_bits == 0) {
666 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
667 }
668
669 return (void*)_non_oop_bits;
670 }
671
672 jint universe_init() {
673 assert(!Universe::_fully_initialized, "called after initialize_vtables");
674 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
675 "LogHeapWordSize is incorrect.");
676 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
677 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
678 "oop size is not not a multiple of HeapWord size");
679
680 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
681
682 JavaClasses::compute_hard_coded_offsets();
683
684 jint status = Universe::initialize_heap();
685 if (status != JNI_OK) {
686 return status;
687 }
688
689 Metaspace::global_initialize();
690
691 // Initialize performance counters for metaspaces
692 MetaspaceCounters::initialize_performance_counters();
693 CompressedClassSpaceCounters::initialize_performance_counters();
694
695 AOTLoader::universe_init();
696
697 // Checks 'AfterMemoryInit' constraints.
698 if (!CommandLineFlagConstraintList::check_constraints(CommandLineFlagConstraint::AfterMemoryInit)) {
699 return JNI_EINVAL;
700 }
701
702 // Create memory for metadata. Must be after initializing heap for
703 // DumpSharedSpaces.
704 ClassLoaderData::init_null_class_loader_data();
705
706 // We have a heap so create the Method* caches before
707 // Metaspace::initialize_shared_spaces() tries to populate them.
708 Universe::_finalizer_register_cache = new LatestMethodCache();
709 Universe::_loader_addClass_cache = new LatestMethodCache();
710 Universe::_pd_implies_cache = new LatestMethodCache();
711 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
712 Universe::_do_stack_walk_cache = new LatestMethodCache();
713
714 #if INCLUDE_CDS
715 if (UseSharedSpaces) {
716 // Read the data structures supporting the shared spaces (shared
717 // system dictionary, symbol table, etc.). After that, access to
718 // the file (other than the mapped regions) is no longer needed, and
719 // the file is closed. Closing the file does not affect the
720 // currently mapped regions.
721 MetaspaceShared::initialize_shared_spaces();
722 StringTable::create_table();
723 } else
724 #endif
725 {
726 SymbolTable::create_table();
727 StringTable::create_table();
728
729 #if INCLUDE_CDS
730 if (DumpSharedSpaces) {
731 MetaspaceShared::prepare_for_dumping();
732 }
733 #endif
734 }
735 if (strlen(VerifySubSet) > 0) {
736 Universe::initialize_verify_flags();
737 }
738
739 ResolvedMethodTable::create_table();
740
741 return JNI_OK;
742 }
743
744 CollectedHeap* Universe::create_heap() {
745 assert(_collectedHeap == NULL, "Heap already created");
746 assert(GCArguments::is_initialized(), "GC must be initialized here");
747 return GCArguments::arguments()->create_heap();
748 }
749
750 // Choose the heap base address and oop encoding mode
751 // when compressed oops are used:
752 // Unscaled - Use 32-bits oops without encoding when
753 // NarrowOopHeapBaseMin + heap_size < 4Gb
754 // ZeroBased - Use zero based compressed oops with encoding when
755 // NarrowOopHeapBaseMin + heap_size < 32Gb
756 // HeapBased - Use compressed oops with heap base + encoding.
757
758 jint Universe::initialize_heap() {
759 jint status = JNI_ERR;
760
761 _collectedHeap = create_heap_ext();
762 if (_collectedHeap == NULL) {
763 _collectedHeap = create_heap();
764 }
765
766 status = _collectedHeap->initialize();
767 if (status != JNI_OK) {
768 return status;
769 }
770 log_info(gc)("Using %s", _collectedHeap->name());
771
772 GCArguments::arguments()->post_heap_initialize();
773 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
774
775 #ifdef _LP64
776 if (UseCompressedOops) {
777 // Subtract a page because something can get allocated at heap base.
778 // This also makes implicit null checking work, because the
779 // memory+1 page below heap_base needs to cause a signal.
780 // See needs_explicit_null_check.
781 // Only set the heap base for compressed oops because it indicates
782 // compressed oops for pstack code.
783 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) {
784 // Didn't reserve heap below 4Gb. Must shift.
785 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
786 }
787 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) {
788 // Did reserve heap below 32Gb. Can use base == 0;
789 Universe::set_narrow_oop_base(0);
790 }
791
792 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base());
793
794 LogTarget(Info, gc, heap, coops) lt;
795 if (lt.is_enabled()) {
796 ResourceMark rm;
797 LogStream ls(lt);
798 Universe::print_compressed_oops_mode(&ls);
799 }
800
801 // Tell tests in which mode we run.
802 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode",
803 narrow_oop_mode_to_string(narrow_oop_mode()),
804 false));
805 }
806 // Universe::narrow_oop_base() is one page below the heap.
807 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() -
808 os::vm_page_size()) ||
809 Universe::narrow_oop_base() == NULL, "invalid value");
810 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes ||
811 Universe::narrow_oop_shift() == 0, "invalid value");
812 #endif
813
814 // We will never reach the CATCH below since Exceptions::_throw will cause
815 // the VM to exit if an exception is thrown during initialization
816
817 if (UseTLAB) {
818 assert(Universe::heap()->supports_tlab_allocation(),
819 "Should support thread-local allocation buffers");
820 ThreadLocalAllocBuffer::startup_initialization();
821 }
822 return JNI_OK;
823 }
824
825 void Universe::print_compressed_oops_mode(outputStream* st) {
826 st->print("Heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
827 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M);
828
829 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode()));
830
831 if (Universe::narrow_oop_base() != 0) {
832 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base()));
833 }
834
835 if (Universe::narrow_oop_shift() != 0) {
836 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
837 }
838
839 if (!Universe::narrow_oop_use_implicit_null_checks()) {
840 st->print(", no protected page in front of the heap");
841 }
842 st->cr();
843 }
844
845 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
846
847 assert(alignment <= Arguments::conservative_max_heap_alignment(),
848 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
849 alignment, Arguments::conservative_max_heap_alignment());
850
851 size_t total_reserved = align_up(heap_size, alignment);
852 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
853 "heap size is too big for compressed oops");
854
855 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size());
856 assert(!UseLargePages
857 || UseParallelGC
858 || use_large_pages, "Wrong alignment to use large pages");
859
860 // Now create the space.
861 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt);
862
863 if (total_rs.is_reserved()) {
864 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
865 "must be exactly of required size and alignment");
866 // We are good.
867
868 if (UseCompressedOops) {
869 // Universe::initialize_heap() will reset this to NULL if unscaled
870 // or zero-based narrow oops are actually used.
871 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
872 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
873 }
874
875 if (AllocateHeapAt != NULL) {
876 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
877 }
878 return total_rs;
879 }
880
881 vm_exit_during_initialization(
882 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
883 total_reserved/K));
884
885 // satisfy compiler
886 ShouldNotReachHere();
887 return ReservedHeapSpace(0, 0, false);
888 }
889
890
891 // It's the caller's responsibility to ensure glitch-freedom
892 // (if required).
893 void Universe::update_heap_info_at_gc() {
894 _heap_capacity_at_last_gc = heap()->capacity();
895 _heap_used_at_last_gc = heap()->used();
896 }
897
898
899 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) {
900 switch (mode) {
901 case UnscaledNarrowOop:
902 return "32-bit";
903 case ZeroBasedNarrowOop:
904 return "Zero based";
905 case DisjointBaseNarrowOop:
906 return "Non-zero disjoint base";
907 case HeapBasedNarrowOop:
908 return "Non-zero based";
909 default:
910 ShouldNotReachHere();
911 return "";
912 }
913 }
914
915
916 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() {
917 if (narrow_oop_base_disjoint()) {
918 return DisjointBaseNarrowOop;
919 }
920
921 if (narrow_oop_base() != 0) {
922 return HeapBasedNarrowOop;
923 }
924
925 if (narrow_oop_shift() != 0) {
926 return ZeroBasedNarrowOop;
927 }
928
929 return UnscaledNarrowOop;
930 }
931
932 void initialize_known_method(LatestMethodCache* method_cache,
933 InstanceKlass* ik,
934 const char* method,
935 Symbol* signature,
936 bool is_static, TRAPS)
937 {
938 TempNewSymbol name = SymbolTable::new_symbol(method, CHECK);
939 Method* m = NULL;
940 // The klass must be linked before looking up the method.
941 if (!ik->link_class_or_fail(THREAD) ||
942 ((m = ik->find_method(name, signature)) == NULL) ||
943 is_static != m->is_static()) {
944 ResourceMark rm(THREAD);
945 // NoSuchMethodException doesn't actually work because it tries to run the
946 // <init> function before java_lang_Class is linked. Print error and exit.
947 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
948 ik->name()->as_C_string(), method));
949 }
950 method_cache->init(ik, m);
951 }
952
953 void Universe::initialize_known_methods(TRAPS) {
954 // Set up static method for registering finalizers
955 initialize_known_method(_finalizer_register_cache,
956 SystemDictionary::Finalizer_klass(),
957 "register",
958 vmSymbols::object_void_signature(), true, CHECK);
959
960 initialize_known_method(_throw_illegal_access_error_cache,
961 SystemDictionary::internal_Unsafe_klass(),
962 "throwIllegalAccessError",
963 vmSymbols::void_method_signature(), true, CHECK);
964
965 // Set up method for registering loaded classes in class loader vector
966 initialize_known_method(_loader_addClass_cache,
967 SystemDictionary::ClassLoader_klass(),
968 "addClass",
969 vmSymbols::class_void_signature(), false, CHECK);
970
971 // Set up method for checking protection domain
972 initialize_known_method(_pd_implies_cache,
973 SystemDictionary::ProtectionDomain_klass(),
974 "impliesCreateAccessControlContext",
975 vmSymbols::void_boolean_signature(), false, CHECK);
976
977 // Set up method for stack walking
978 initialize_known_method(_do_stack_walk_cache,
979 SystemDictionary::AbstractStackWalker_klass(),
980 "doStackWalk",
981 vmSymbols::doStackWalk_signature(), false, CHECK);
982 }
983
984 void universe2_init() {
985 EXCEPTION_MARK;
986 Universe::genesis(CATCH);
987 }
988
989 // Set after initialization of the module runtime, call_initModuleRuntime
990 void universe_post_module_init() {
991 Universe::_module_initialized = true;
992 }
993
994 bool universe_post_init() {
995 assert(!is_init_completed(), "Error: initialization not yet completed!");
996 Universe::_fully_initialized = true;
997 EXCEPTION_MARK;
998 { ResourceMark rm;
999 Interpreter::initialize(); // needed for interpreter entry points
1000 if (!UseSharedSpaces) {
1001 HandleMark hm(THREAD);
1002 Klass* ok = SystemDictionary::Object_klass();
1003 Universe::reinitialize_vtable_of(ok, CHECK_false);
1004 Universe::reinitialize_itables(CHECK_false);
1005 }
1006 }
1007
1008 HandleMark hm(THREAD);
1009 // Setup preallocated empty java.lang.Class array
1010 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
1011
1012 // Setup preallocated OutOfMemoryError errors
1013 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
1014 InstanceKlass* ik = InstanceKlass::cast(k);
1015 Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false);
1016 Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false);
1017 Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false);
1018 Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false);
1019 Universe::_out_of_memory_error_gc_overhead_limit =
1020 ik->allocate_instance(CHECK_false);
1021 Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false);
1022
1023 // Setup preallocated cause message for delayed StackOverflowError
1024 if (StackReservedPages > 0) {
1025 Universe::_delayed_stack_overflow_error_message =
1026 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
1027 }
1028
1029 // Setup preallocated NullPointerException
1030 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1031 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
1032 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1033 // Setup preallocated ArithmeticException
1034 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1035 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
1036 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1037 // Virtual Machine Error for when we get into a situation we can't resolve
1038 k = SystemDictionary::resolve_or_fail(
1039 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
1040 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1041 if (!linked) {
1042 tty->print_cr("Unable to link/verify VirtualMachineError class");
1043 return false; // initialization failed
1044 }
1045 Universe::_virtual_machine_error_instance =
1046 InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1047
1048 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1049
1050 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
1051 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
1052
1053 msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
1054 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
1055 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
1056 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
1057
1058 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
1059 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
1060
1061 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
1062 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
1063
1064 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false);
1065 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg());
1066
1067 msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1068 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
1069
1070 // Setup the array of errors that have preallocated backtrace
1071 k = Universe::_out_of_memory_error_java_heap->klass();
1072 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
1073 ik = InstanceKlass::cast(k);
1074
1075 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
1076 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false);
1077 for (int i=0; i<len; i++) {
1078 oop err = ik->allocate_instance(CHECK_false);
1079 Handle err_h = Handle(THREAD, err);
1080 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
1081 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
1082 }
1083 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
1084
1085 Universe::initialize_known_methods(CHECK_false);
1086
1087 // This needs to be done before the first scavenge/gc, since
1088 // it's an input to soft ref clearing policy.
1089 {
1090 MutexLocker x(Heap_lock);
1091 Universe::update_heap_info_at_gc();
1092 }
1093
1094 // ("weak") refs processing infrastructure initialization
1095 Universe::heap()->post_initialize();
1096
1097 MemoryService::add_metaspace_memory_pools();
1098
1099 MemoryService::set_universe_heap(Universe::heap());
1100 #if INCLUDE_CDS
1101 SharedClassUtil::initialize(CHECK_false);
1102 #endif
1103 return true;
1104 }
1105
1106
1107 void Universe::compute_base_vtable_size() {
1108 _base_vtable_size = ClassLoader::compute_Object_vtable();
1109 }
1110
1111 void Universe::print_on(outputStream* st) {
1112 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1113 st->print_cr("Heap");
1114 heap()->print_on(st);
1115 }
1116
1117 void Universe::print_heap_at_SIGBREAK() {
1118 if (PrintHeapAtSIGBREAK) {
1119 print_on(tty);
1120 tty->cr();
1121 tty->flush();
1122 }
1123 }
1124
1125 void Universe::print_heap_before_gc() {
1126 LogTarget(Debug, gc, heap) lt;
1127 if (lt.is_enabled()) {
1128 LogStream ls(lt);
1129 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1130 ResourceMark rm;
1131 heap()->print_on(&ls);
1132 }
1133 }
1134
1135 void Universe::print_heap_after_gc() {
1136 LogTarget(Debug, gc, heap) lt;
1137 if (lt.is_enabled()) {
1138 LogStream ls(lt);
1139 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1140 ResourceMark rm;
1141 heap()->print_on(&ls);
1142 }
1143 }
1144
1145 void Universe::initialize_verify_flags() {
1146 verify_flags = 0;
1147 const char delimiter[] = " ,";
1148
1149 size_t length = strlen(VerifySubSet);
1150 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1151 strncpy(subset_list, VerifySubSet, length + 1);
1152
1153 char* token = strtok(subset_list, delimiter);
1154 while (token != NULL) {
1155 if (strcmp(token, "threads") == 0) {
1156 verify_flags |= Verify_Threads;
1157 } else if (strcmp(token, "heap") == 0) {
1158 verify_flags |= Verify_Heap;
1159 } else if (strcmp(token, "symbol_table") == 0) {
1160 verify_flags |= Verify_SymbolTable;
1161 } else if (strcmp(token, "string_table") == 0) {
1162 verify_flags |= Verify_StringTable;
1163 } else if (strcmp(token, "codecache") == 0) {
1164 verify_flags |= Verify_CodeCache;
1165 } else if (strcmp(token, "dictionary") == 0) {
1166 verify_flags |= Verify_SystemDictionary;
1167 } else if (strcmp(token, "classloader_data_graph") == 0) {
1168 verify_flags |= Verify_ClassLoaderDataGraph;
1169 } else if (strcmp(token, "metaspace") == 0) {
1170 verify_flags |= Verify_MetaspaceAux;
1171 } else if (strcmp(token, "jni_handles") == 0) {
1172 verify_flags |= Verify_JNIHandles;
1173 } else if (strcmp(token, "codecache_oops") == 0) {
1174 verify_flags |= Verify_CodeCacheOops;
1175 } else {
1176 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1177 }
1178 token = strtok(NULL, delimiter);
1179 }
1180 FREE_C_HEAP_ARRAY(char, subset_list);
1181 }
1182
1183 bool Universe::should_verify_subset(uint subset) {
1184 if (verify_flags & subset) {
1185 return true;
1186 }
1187 return false;
1188 }
1189
1190 void Universe::verify(VerifyOption option, const char* prefix) {
1191 // The use of _verify_in_progress is a temporary work around for
1192 // 6320749. Don't bother with a creating a class to set and clear
1193 // it since it is only used in this method and the control flow is
1194 // straight forward.
1195 _verify_in_progress = true;
1196
1197 COMPILER2_PRESENT(
1198 assert(!DerivedPointerTable::is_active(),
1199 "DPT should not be active during verification "
1200 "(of thread stacks below)");
1201 )
1202
1203 ResourceMark rm;
1204 HandleMark hm; // Handles created during verification can be zapped
1205 _verify_count++;
1206
1207 FormatBuffer<> title("Verifying %s", prefix);
1208 GCTraceTime(Info, gc, verify) tm(title.buffer());
1209 if (should_verify_subset(Verify_Threads)) {
1210 log_debug(gc, verify)("Threads");
1211 Threads::verify();
1212 }
1213 if (should_verify_subset(Verify_Heap)) {
1214 log_debug(gc, verify)("Heap");
1215 heap()->verify(option);
1216 }
1217 if (should_verify_subset(Verify_SymbolTable)) {
1218 log_debug(gc, verify)("SymbolTable");
1219 SymbolTable::verify();
1220 }
1221 if (should_verify_subset(Verify_StringTable)) {
1222 log_debug(gc, verify)("StringTable");
1223 StringTable::verify();
1224 }
1225 if (should_verify_subset(Verify_CodeCache)) {
1226 {
1227 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1228 log_debug(gc, verify)("CodeCache");
1229 CodeCache::verify();
1230 }
1231 }
1232 if (should_verify_subset(Verify_SystemDictionary)) {
1233 log_debug(gc, verify)("SystemDictionary");
1234 SystemDictionary::verify();
1235 }
1236 #ifndef PRODUCT
1237 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1238 log_debug(gc, verify)("ClassLoaderDataGraph");
1239 ClassLoaderDataGraph::verify();
1240 }
1241 #endif
1242 if (should_verify_subset(Verify_MetaspaceAux)) {
1243 log_debug(gc, verify)("MetaspaceAux");
1244 MetaspaceAux::verify_free_chunks();
1245 }
1246 if (should_verify_subset(Verify_JNIHandles)) {
1247 log_debug(gc, verify)("JNIHandles");
1248 JNIHandles::verify();
1249 }
1250 if (should_verify_subset(Verify_CodeCacheOops)) {
1251 log_debug(gc, verify)("CodeCache Oops");
1252 CodeCache::verify_oops();
1253 }
1254
1255 _verify_in_progress = false;
1256 }
1257
1258
1259 #ifndef PRODUCT
1260 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1261 assert(low_boundary < high_boundary, "bad interval");
1262
1263 // decide which low-order bits we require to be clear:
1264 size_t alignSize = MinObjAlignmentInBytes;
1265 size_t min_object_size = CollectedHeap::min_fill_size();
1266
1267 // make an inclusive limit:
1268 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1269 uintptr_t min = (uintptr_t)low_boundary;
1270 assert(min < max, "bad interval");
1271 uintptr_t diff = max ^ min;
1272
1273 // throw away enough low-order bits to make the diff vanish
1274 uintptr_t mask = (uintptr_t)(-1);
1275 while ((mask & diff) != 0)
1276 mask <<= 1;
1277 uintptr_t bits = (min & mask);
1278 assert(bits == (max & mask), "correct mask");
1279 // check an intermediate value between min and max, just to make sure:
1280 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1281
1282 // require address alignment, too:
1283 mask |= (alignSize - 1);
1284
1285 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1286 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1287 }
1288 _verify_oop_mask = mask;
1289 _verify_oop_bits = bits;
1290 }
1291
1292 // Oop verification (see MacroAssembler::verify_oop)
1293
1294 uintptr_t Universe::verify_oop_mask() {
1295 MemRegion m = heap()->reserved_region();
1296 calculate_verify_data(m.start(), m.end());
1297 return _verify_oop_mask;
1298 }
1299
1300 uintptr_t Universe::verify_oop_bits() {
1301 MemRegion m = heap()->reserved_region();
1302 calculate_verify_data(m.start(), m.end());
1303 return _verify_oop_bits;
1304 }
1305
1306 uintptr_t Universe::verify_mark_mask() {
1307 return markOopDesc::lock_mask_in_place;
1308 }
1309
1310 uintptr_t Universe::verify_mark_bits() {
1311 intptr_t mask = verify_mark_mask();
1312 intptr_t bits = (intptr_t)markOopDesc::prototype();
1313 assert((bits & ~mask) == 0, "no stray header bits");
1314 return bits;
1315 }
1316 #endif // PRODUCT
1317
1318
1319 void Universe::compute_verify_oop_data() {
1320 verify_oop_mask();
1321 verify_oop_bits();
1322 verify_mark_mask();
1323 verify_mark_bits();
1324 }
1325
1326
1327 void LatestMethodCache::init(Klass* k, Method* m) {
1328 if (!UseSharedSpaces) {
1329 _klass = k;
1330 }
1331 #ifndef PRODUCT
1332 else {
1333 // sharing initilization should have already set up _klass
1334 assert(_klass != NULL, "just checking");
1335 }
1336 #endif
1337
1338 _method_idnum = m->method_idnum();
1339 assert(_method_idnum >= 0, "sanity check");
1340 }
1341
1342
1343 Method* LatestMethodCache::get_method() {
1344 if (klass() == NULL) return NULL;
1345 InstanceKlass* ik = InstanceKlass::cast(klass());
1346 Method* m = ik->method_with_idnum(method_idnum());
1347 assert(m != NULL, "sanity check");
1348 return m;
1349 }
1350
1351
1352 #ifdef ASSERT
1353 // Release dummy object(s) at bottom of heap
1354 bool Universe::release_fullgc_alot_dummy() {
1355 MutexLocker ml(FullGCALot_lock);
1356 if (_fullgc_alot_dummy_array != NULL) {
1357 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
1358 // No more dummies to release, release entire array instead
1359 _fullgc_alot_dummy_array = NULL;
1360 return false;
1361 }
1362 if (!UseConcMarkSweepGC) {
1363 // Release dummy at bottom of old generation
1364 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1365 }
1366 // Release dummy at bottom of permanent generation
1367 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1368 }
1369 return true;
1370 }
1371
1372 #endif // ASSERT