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/metaspaceShared.hpp"
49 #include "memory/oopFactory.hpp"
50 #include "memory/resourceArea.hpp"
51 #include "memory/universe.hpp"
52 #include "memory/universe.inline.hpp"
53 #include "oops/constantPool.hpp"
54 #include "oops/instanceClassLoaderKlass.hpp"
55 #include "oops/instanceKlass.hpp"
56 #include "oops/instanceMirrorKlass.hpp"
57 #include "oops/instanceRefKlass.hpp"
58 #include "oops/objArrayOop.inline.hpp"
59 #include "oops/oop.inline.hpp"
60 #include "oops/typeArrayKlass.hpp"
61 #include "prims/resolvedMethodTable.hpp"
62 #include "runtime/arguments.hpp"
63 #include "runtime/atomic.hpp"
64 #include "runtime/commandLineFlagConstraintList.hpp"
65 #include "runtime/deoptimization.hpp"
66 #include "runtime/handles.inline.hpp"
67 #include "runtime/init.hpp"
68 #include "runtime/java.hpp"
69 #include "runtime/javaCalls.hpp"
70 #include "runtime/sharedRuntime.hpp"
71 #include "runtime/synchronizer.hpp"
72 #include "runtime/thread.inline.hpp"
73 #include "runtime/timerTrace.hpp"
74 #include "runtime/vm_operations.hpp"
75 #include "services/memoryService.hpp"
76 #include "utilities/align.hpp"
77 #include "utilities/copy.hpp"
78 #include "utilities/debug.hpp"
79 #include "utilities/events.hpp"
80 #include "utilities/formatBuffer.hpp"
81 #include "utilities/hashtable.inline.hpp"
82 #include "utilities/macros.hpp"
83 #include "utilities/ostream.hpp"
84 #include "utilities/preserveException.hpp"
85 #if INCLUDE_CDS
86 #include "classfile/sharedClassUtil.hpp"
87 #endif
88
89 // Known objects
90 Klass* Universe::_boolArrayKlassObj = NULL;
91 Klass* Universe::_byteArrayKlassObj = NULL;
92 Klass* Universe::_charArrayKlassObj = NULL;
93 Klass* Universe::_intArrayKlassObj = NULL;
94 Klass* Universe::_shortArrayKlassObj = NULL;
95 Klass* Universe::_longArrayKlassObj = NULL;
96 Klass* Universe::_singleArrayKlassObj = NULL;
97 Klass* Universe::_doubleArrayKlassObj = NULL;
98 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ };
99 Klass* Universe::_objectArrayKlassObj = NULL;
100 oop Universe::_int_mirror = NULL;
101 oop Universe::_float_mirror = NULL;
102 oop Universe::_double_mirror = NULL;
103 oop Universe::_byte_mirror = NULL;
104 oop Universe::_bool_mirror = NULL;
105 oop Universe::_char_mirror = NULL;
106 oop Universe::_long_mirror = NULL;
107 oop Universe::_short_mirror = NULL;
108 oop Universe::_void_mirror = NULL;
109 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ };
110 oop Universe::_main_thread_group = NULL;
111 oop Universe::_system_thread_group = NULL;
112 objArrayOop Universe::_the_empty_class_klass_array = NULL;
113 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
114 oop Universe::_the_null_sentinel = 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::_reference_pending_list = NULL;
138
139 Array<int>* Universe::_the_empty_int_array = NULL;
140 Array<u2>* Universe::_the_empty_short_array = NULL;
141 Array<Klass*>* Universe::_the_empty_klass_array = NULL;
142 Array<Method*>* Universe::_the_empty_method_array = NULL;
143
144 // These variables are guarded by FullGCALot_lock.
145 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;)
146 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
147
148 // Heap
149 int Universe::_verify_count = 0;
150
151 // Oop verification (see MacroAssembler::verify_oop)
152 uintptr_t Universe::_verify_oop_mask = 0;
153 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
154
155 int Universe::_base_vtable_size = 0;
156 bool Universe::_bootstrapping = false;
157 bool Universe::_module_initialized = false;
158 bool Universe::_fully_initialized = false;
159
160 size_t Universe::_heap_capacity_at_last_gc;
161 size_t Universe::_heap_used_at_last_gc = 0;
162
163 CollectedHeap* Universe::_collectedHeap = NULL;
164
165 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true };
166 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true };
167 address Universe::_narrow_ptrs_base;
168
169 void Universe::basic_type_classes_do(void f(Klass*)) {
170 f(boolArrayKlassObj());
171 f(byteArrayKlassObj());
172 f(charArrayKlassObj());
173 f(intArrayKlassObj());
174 f(shortArrayKlassObj());
175 f(longArrayKlassObj());
176 f(singleArrayKlassObj());
177 f(doubleArrayKlassObj());
178 }
179
180 void Universe::oops_do(OopClosure* f, bool do_all) {
181
182 f->do_oop((oop*) &_int_mirror);
183 f->do_oop((oop*) &_float_mirror);
184 f->do_oop((oop*) &_double_mirror);
185 f->do_oop((oop*) &_byte_mirror);
186 f->do_oop((oop*) &_bool_mirror);
187 f->do_oop((oop*) &_char_mirror);
188 f->do_oop((oop*) &_long_mirror);
189 f->do_oop((oop*) &_short_mirror);
190 f->do_oop((oop*) &_void_mirror);
191
192 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
193 f->do_oop((oop*) &_mirrors[i]);
194 }
195 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
196
197 f->do_oop((oop*)&_the_empty_class_klass_array);
198 f->do_oop((oop*)&_the_null_sentinel);
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*)&_reference_pending_list);
216 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);)
217 }
218
219 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
220 it->push(&_klass);
221 }
222
223 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
224 it->push(&_boolArrayKlassObj);
225 it->push(&_byteArrayKlassObj);
226 it->push(&_charArrayKlassObj);
227 it->push(&_intArrayKlassObj);
228 it->push(&_shortArrayKlassObj);
229 it->push(&_longArrayKlassObj);
230 it->push(&_singleArrayKlassObj);
231 it->push(&_doubleArrayKlassObj);
232 for (int i = 0; i < T_VOID+1; i++) {
233 it->push(&_typeArrayKlassObjs[i]);
234 }
235 it->push(&_objectArrayKlassObj);
236
237 it->push(&_the_empty_int_array);
238 it->push(&_the_empty_short_array);
239 it->push(&_the_empty_klass_array);
240 it->push(&_the_empty_method_array);
241 it->push(&_the_array_interfaces_array);
242
243 _finalizer_register_cache->metaspace_pointers_do(it);
244 _loader_addClass_cache->metaspace_pointers_do(it);
245 _pd_implies_cache->metaspace_pointers_do(it);
246 _throw_illegal_access_error_cache->metaspace_pointers_do(it);
247 _do_stack_walk_cache->metaspace_pointers_do(it);
248 }
249
250 // Serialize metadata in and out of CDS archive, not oops.
251 void Universe::serialize(SerializeClosure* f, bool do_all) {
252
253 f->do_ptr((void**)&_boolArrayKlassObj);
254 f->do_ptr((void**)&_byteArrayKlassObj);
255 f->do_ptr((void**)&_charArrayKlassObj);
256 f->do_ptr((void**)&_intArrayKlassObj);
257 f->do_ptr((void**)&_shortArrayKlassObj);
258 f->do_ptr((void**)&_longArrayKlassObj);
259 f->do_ptr((void**)&_singleArrayKlassObj);
260 f->do_ptr((void**)&_doubleArrayKlassObj);
261 f->do_ptr((void**)&_objectArrayKlassObj);
262
263 {
264 for (int i = 0; i < T_VOID+1; i++) {
265 if (_typeArrayKlassObjs[i] != NULL) {
266 assert(i >= T_BOOLEAN, "checking");
267 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
268 } else if (do_all) {
269 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
270 }
271 }
272 }
273
274 f->do_ptr((void**)&_the_array_interfaces_array);
275 f->do_ptr((void**)&_the_empty_int_array);
276 f->do_ptr((void**)&_the_empty_short_array);
277 f->do_ptr((void**)&_the_empty_method_array);
278 f->do_ptr((void**)&_the_empty_klass_array);
279 _finalizer_register_cache->serialize(f);
280 _loader_addClass_cache->serialize(f);
281 _pd_implies_cache->serialize(f);
282 _throw_illegal_access_error_cache->serialize(f);
283 _do_stack_walk_cache->serialize(f);
284 }
285
286 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
287 if (size < alignment || size % alignment != 0) {
288 vm_exit_during_initialization(
289 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
290 }
291 }
292
293 void initialize_basic_type_klass(Klass* k, TRAPS) {
294 Klass* ok = SystemDictionary::Object_klass();
295 #if INCLUDE_CDS
296 if (UseSharedSpaces) {
297 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
298 assert(k->super() == ok, "u3");
299 k->restore_unshareable_info(loader_data, Handle(), CHECK);
300 } else
301 #endif
302 {
303 k->initialize_supers(ok, CHECK);
304 }
305 k->append_to_sibling_list();
306 }
307
308 void Universe::genesis(TRAPS) {
309 ResourceMark rm;
310
311 { FlagSetting fs(_bootstrapping, true);
312
313 { MutexLocker mc(Compile_lock);
314
315 java_lang_Class::allocate_fixup_lists();
316
317 // determine base vtable size; without that we cannot create the array klasses
318 compute_base_vtable_size();
319
320 if (!UseSharedSpaces) {
321 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK);
322 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK);
323 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK);
324 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK);
325 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK);
326 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK);
327 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK);
328 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK);
329
330 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj;
331 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj;
332 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj;
333 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj;
334 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj;
335 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj;
336 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj;
337 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj;
338
339 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
340
341 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
342 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
343 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
344 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
345 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
346 }
347 }
348
349 vmSymbols::initialize(CHECK);
350
351 SystemDictionary::initialize(CHECK);
352
353 Klass* ok = SystemDictionary::Object_klass();
354
355 _the_null_string = StringTable::intern("null", CHECK);
356 _the_min_jint_string = StringTable::intern("-2147483648", CHECK);
357
358 #if INCLUDE_CDS
359 if (UseSharedSpaces) {
360 // Verify shared interfaces array.
361 assert(_the_array_interfaces_array->at(0) ==
362 SystemDictionary::Cloneable_klass(), "u3");
363 assert(_the_array_interfaces_array->at(1) ==
364 SystemDictionary::Serializable_klass(), "u3");
365 MetaspaceShared::fixup_mapped_heap_regions();
366 } else
367 #endif
368 {
369 // Set up shared interfaces array. (Do this before supers are set up.)
370 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
371 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
372 }
373
374 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
375 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
376 initialize_basic_type_klass(singleArrayKlassObj(), CHECK);
377 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
378 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
379 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
380 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
381 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
382 } // end of core bootstrapping
383
384 {
385 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
386 _the_null_sentinel = tns();
387 }
388
389 // Maybe this could be lifted up now that object array can be initialized
390 // during the bootstrapping.
391
392 // OLD
393 // Initialize _objectArrayKlass after core bootstraping to make
394 // sure the super class is set up properly for _objectArrayKlass.
395 // ---
396 // NEW
397 // Since some of the old system object arrays have been converted to
398 // ordinary object arrays, _objectArrayKlass will be loaded when
399 // SystemDictionary::initialize(CHECK); is run. See the extra check
400 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
401 _objectArrayKlassObj = InstanceKlass::
402 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
403 // OLD
404 // Add the class to the class hierarchy manually to make sure that
405 // its vtable is initialized after core bootstrapping is completed.
406 // ---
407 // New
408 // Have already been initialized.
409 _objectArrayKlassObj->append_to_sibling_list();
410
411 #ifdef ASSERT
412 if (FullGCALot) {
413 // Allocate an array of dummy objects.
414 // We'd like these to be at the bottom of the old generation,
415 // so that when we free one and then collect,
416 // (almost) the whole heap moves
417 // and we find out if we actually update all the oops correctly.
418 // But we can't allocate directly in the old generation,
419 // so we allocate wherever, and hope that the first collection
420 // moves these objects to the bottom of the old generation.
421 // We can allocate directly in the permanent generation, so we do.
422 int size;
423 if (UseConcMarkSweepGC) {
424 log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate");
425 size = FullGCALotDummies;
426 } else {
427 size = FullGCALotDummies * 2;
428 }
429 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
430 objArrayHandle dummy_array(THREAD, naked_array);
431 int i = 0;
432 while (i < size) {
433 // Allocate dummy in old generation
434 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK);
435 dummy_array->obj_at_put(i++, dummy);
436 }
437 {
438 // Only modify the global variable inside the mutex.
439 // If we had a race to here, the other dummy_array instances
440 // and their elements just get dropped on the floor, which is fine.
441 MutexLocker ml(FullGCALot_lock);
442 if (_fullgc_alot_dummy_array == NULL) {
443 _fullgc_alot_dummy_array = dummy_array();
444 }
445 }
446 assert(i == _fullgc_alot_dummy_array->length(), "just checking");
447 }
448 #endif
449
450 // Initialize dependency array for null class loader
451 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK);
452
453 }
454
455 void Universe::initialize_basic_type_mirrors(TRAPS) {
456 assert(_int_mirror==NULL, "basic type mirrors already initialized");
457 _int_mirror =
458 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK);
459 _float_mirror =
460 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK);
461 _double_mirror =
462 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK);
463 _byte_mirror =
464 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK);
465 _bool_mirror =
466 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
467 _char_mirror =
468 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK);
469 _long_mirror =
470 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK);
471 _short_mirror =
472 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK);
473 _void_mirror =
474 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK);
475
476 _mirrors[T_INT] = _int_mirror;
477 _mirrors[T_FLOAT] = _float_mirror;
478 _mirrors[T_DOUBLE] = _double_mirror;
479 _mirrors[T_BYTE] = _byte_mirror;
480 _mirrors[T_BOOLEAN] = _bool_mirror;
481 _mirrors[T_CHAR] = _char_mirror;
482 _mirrors[T_LONG] = _long_mirror;
483 _mirrors[T_SHORT] = _short_mirror;
484 _mirrors[T_VOID] = _void_mirror;
485 //_mirrors[T_OBJECT] = _object_klass->java_mirror();
486 //_mirrors[T_ARRAY] = _object_klass->java_mirror();
487 }
488
489 void Universe::fixup_mirrors(TRAPS) {
490 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
491 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
492 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
493 // that the number of objects allocated at this point is very small.
494 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
495 HandleMark hm(THREAD);
496 // Cache the start of the static fields
497 InstanceMirrorKlass::init_offset_of_static_fields();
498
499 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
500 int list_length = list->length();
501 for (int i = 0; i < list_length; i++) {
502 Klass* k = list->at(i);
503 assert(k->is_klass(), "List should only hold classes");
504 EXCEPTION_MARK;
505 java_lang_Class::fixup_mirror(k, CATCH);
506 }
507 delete java_lang_Class::fixup_mirror_list();
508 java_lang_Class::set_fixup_mirror_list(NULL);
509 }
510
511 #define assert_pll_locked(test) \
512 assert(Heap_lock->test(), "Reference pending list access requires lock")
513
514 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
515
516 oop Universe::reference_pending_list() {
517 if (Thread::current()->is_VM_thread()) {
518 assert_pll_locked(is_locked);
519 } else {
520 assert_pll_ownership();
521 }
522 return _reference_pending_list;
523 }
524
525 void Universe::set_reference_pending_list(oop list) {
526 assert_pll_ownership();
527 _reference_pending_list = list;
528 }
529
530 bool Universe::has_reference_pending_list() {
531 assert_pll_ownership();
532 return _reference_pending_list != NULL;
533 }
534
535 oop Universe::swap_reference_pending_list(oop list) {
536 assert_pll_locked(is_locked);
537 return Atomic::xchg(list, &_reference_pending_list);
538 }
539
540 #undef assert_pll_locked
541 #undef assert_pll_ownership
542
543
544 static bool has_run_finalizers_on_exit = false;
545
546 void Universe::run_finalizers_on_exit() {
547 if (has_run_finalizers_on_exit) return;
548 has_run_finalizers_on_exit = true;
549
550 // Called on VM exit. This ought to be run in a separate thread.
551 log_trace(ref)("Callback to run finalizers on exit");
552 {
553 PRESERVE_EXCEPTION_MARK;
554 Klass* finalizer_klass = SystemDictionary::Finalizer_klass();
555 JavaValue result(T_VOID);
556 JavaCalls::call_static(
557 &result,
558 finalizer_klass,
559 vmSymbols::run_finalizers_on_exit_name(),
560 vmSymbols::void_method_signature(),
561 THREAD
562 );
563 // Ignore any pending exceptions
564 CLEAR_PENDING_EXCEPTION;
565 }
566 }
567
568
569 // initialize_vtable could cause gc if
570 // 1) we specified true to initialize_vtable and
571 // 2) this ran after gc was enabled
572 // In case those ever change we use handles for oops
573 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) {
574 // init vtable of k and all subclasses
575 ko->vtable().initialize_vtable(false, CHECK);
576 if (ko->is_instance_klass()) {
577 for (Klass* sk = ko->subklass();
578 sk != NULL;
579 sk = sk->next_sibling()) {
580 reinitialize_vtable_of(sk, CHECK);
581 }
582 }
583 }
584
585
586 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) {
587 k->itable().initialize_itable(false, CHECK);
588 }
589
590
591 void Universe::reinitialize_itables(TRAPS) {
592 ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK);
593 }
594
595
596 bool Universe::on_page_boundary(void* addr) {
597 return is_aligned(addr, os::vm_page_size());
598 }
599
600
601 bool Universe::should_fill_in_stack_trace(Handle throwable) {
602 // never attempt to fill in the stack trace of preallocated errors that do not have
603 // backtrace. These errors are kept alive forever and may be "re-used" when all
604 // preallocated errors with backtrace have been consumed. Also need to avoid
605 // a potential loop which could happen if an out of memory occurs when attempting
606 // to allocate the backtrace.
607 return ((throwable() != Universe::_out_of_memory_error_java_heap) &&
608 (throwable() != Universe::_out_of_memory_error_metaspace) &&
609 (throwable() != Universe::_out_of_memory_error_class_metaspace) &&
610 (throwable() != Universe::_out_of_memory_error_array_size) &&
611 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) &&
612 (throwable() != Universe::_out_of_memory_error_realloc_objects));
613 }
614
615
616 oop Universe::gen_out_of_memory_error(oop default_err) {
617 // generate an out of memory error:
618 // - if there is a preallocated error and stack traces are available
619 // (j.l.Throwable is initialized), then return the preallocated
620 // error with a filled in stack trace, and with the message
621 // provided by the default error.
622 // - otherwise, return the default error, without a stack trace.
623 int next;
624 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
625 SystemDictionary::Throwable_klass()->is_initialized()) {
626 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);
627 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
628 } else {
629 next = -1;
630 }
631 if (next < 0) {
632 // all preallocated errors have been used.
633 // return default
634 return default_err;
635 } else {
636 Thread* THREAD = Thread::current();
637 Handle default_err_h(THREAD, default_err);
638 // get the error object at the slot and set set it to NULL so that the
639 // array isn't keeping it alive anymore.
640 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next));
641 assert(exc() != NULL, "slot has been used already");
642 preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
643
644 // use the message from the default error
645 oop msg = java_lang_Throwable::message(default_err_h());
646 assert(msg != NULL, "no message");
647 java_lang_Throwable::set_message(exc(), msg);
648
649 // populate the stack trace and return it.
650 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
651 return exc();
652 }
653 }
654
655 intptr_t Universe::_non_oop_bits = 0;
656
657 void* Universe::non_oop_word() {
658 // Neither the high bits nor the low bits of this value is allowed
659 // to look like (respectively) the high or low bits of a real oop.
660 //
661 // High and low are CPU-specific notions, but low always includes
662 // the low-order bit. Since oops are always aligned at least mod 4,
663 // setting the low-order bit will ensure that the low half of the
664 // word will never look like that of a real oop.
665 //
666 // Using the OS-supplied non-memory-address word (usually 0 or -1)
667 // will take care of the high bits, however many there are.
668
669 if (_non_oop_bits == 0) {
670 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
671 }
672
673 return (void*)_non_oop_bits;
674 }
675
676 jint universe_init() {
677 assert(!Universe::_fully_initialized, "called after initialize_vtables");
678 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
679 "LogHeapWordSize is incorrect.");
680 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
681 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
682 "oop size is not not a multiple of HeapWord size");
683
684 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
685
686 JavaClasses::compute_hard_coded_offsets();
687
688 jint status = Universe::initialize_heap();
689 if (status != JNI_OK) {
690 return status;
691 }
692
693 Metaspace::global_initialize();
694
695 // Initialize performance counters for metaspaces
696 MetaspaceCounters::initialize_performance_counters();
697 CompressedClassSpaceCounters::initialize_performance_counters();
698
699 AOTLoader::universe_init();
700
701 // Checks 'AfterMemoryInit' constraints.
702 if (!CommandLineFlagConstraintList::check_constraints(CommandLineFlagConstraint::AfterMemoryInit)) {
703 return JNI_EINVAL;
704 }
705
706 // Create memory for metadata. Must be after initializing heap for
707 // DumpSharedSpaces.
708 ClassLoaderData::init_null_class_loader_data();
709
710 // We have a heap so create the Method* caches before
711 // Metaspace::initialize_shared_spaces() tries to populate them.
712 Universe::_finalizer_register_cache = new LatestMethodCache();
713 Universe::_loader_addClass_cache = new LatestMethodCache();
714 Universe::_pd_implies_cache = new LatestMethodCache();
715 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
716 Universe::_do_stack_walk_cache = new LatestMethodCache();
717
718 #if INCLUDE_CDS
719 if (UseSharedSpaces) {
720 // Read the data structures supporting the shared spaces (shared
721 // system dictionary, symbol table, etc.). After that, access to
722 // the file (other than the mapped regions) is no longer needed, and
723 // the file is closed. Closing the file does not affect the
724 // currently mapped regions.
725 MetaspaceShared::initialize_shared_spaces();
726 StringTable::create_table();
727 } else
728 #endif
729 {
730 SymbolTable::create_table();
731 StringTable::create_table();
732
733 #if INCLUDE_CDS
734 if (DumpSharedSpaces) {
735 MetaspaceShared::prepare_for_dumping();
736 }
737 #endif
738 }
739 if (strlen(VerifySubSet) > 0) {
740 Universe::initialize_verify_flags();
741 }
742
743 ResolvedMethodTable::create_table();
744
745 return JNI_OK;
746 }
747
748 CollectedHeap* Universe::create_heap() {
749 assert(_collectedHeap == NULL, "Heap already created");
750 assert(GCArguments::is_initialized(), "GC must be initialized here");
751 return GCArguments::arguments()->create_heap();
752 }
753
754 // Choose the heap base address and oop encoding mode
755 // when compressed oops are used:
756 // Unscaled - Use 32-bits oops without encoding when
757 // NarrowOopHeapBaseMin + heap_size < 4Gb
758 // ZeroBased - Use zero based compressed oops with encoding when
759 // NarrowOopHeapBaseMin + heap_size < 32Gb
760 // HeapBased - Use compressed oops with heap base + encoding.
761
762 jint Universe::initialize_heap() {
763 jint status = JNI_ERR;
764
765 _collectedHeap = create_heap_ext();
766 if (_collectedHeap == NULL) {
767 _collectedHeap = create_heap();
768 }
769
770 status = _collectedHeap->initialize();
771 if (status != JNI_OK) {
772 return status;
773 }
774 log_info(gc)("Using %s", _collectedHeap->name());
775
776 GCArguments::arguments()->post_heap_initialize();
777 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
778
779 #ifdef _LP64
780 if (UseCompressedOops) {
781 // Subtract a page because something can get allocated at heap base.
782 // This also makes implicit null checking work, because the
783 // memory+1 page below heap_base needs to cause a signal.
784 // See needs_explicit_null_check.
785 // Only set the heap base for compressed oops because it indicates
786 // compressed oops for pstack code.
787 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) {
788 // Didn't reserve heap below 4Gb. Must shift.
789 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
790 }
791 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) {
792 // Did reserve heap below 32Gb. Can use base == 0;
793 Universe::set_narrow_oop_base(0);
794 }
795
796 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base());
797
798 LogTarget(Info, gc, heap, coops) lt;
799 if (lt.is_enabled()) {
800 ResourceMark rm;
801 LogStream ls(lt);
802 Universe::print_compressed_oops_mode(&ls);
803 }
804
805 // Tell tests in which mode we run.
806 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode",
807 narrow_oop_mode_to_string(narrow_oop_mode()),
808 false));
809 }
810 // Universe::narrow_oop_base() is one page below the heap.
811 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() -
812 os::vm_page_size()) ||
813 Universe::narrow_oop_base() == NULL, "invalid value");
814 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes ||
815 Universe::narrow_oop_shift() == 0, "invalid value");
816 #endif
817
818 // We will never reach the CATCH below since Exceptions::_throw will cause
819 // the VM to exit if an exception is thrown during initialization
820
821 if (UseTLAB) {
822 assert(Universe::heap()->supports_tlab_allocation(),
823 "Should support thread-local allocation buffers");
824 ThreadLocalAllocBuffer::startup_initialization();
825 }
826 return JNI_OK;
827 }
828
829 void Universe::print_compressed_oops_mode(outputStream* st) {
830 st->print("Heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
831 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M);
832
833 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode()));
834
835 if (Universe::narrow_oop_base() != 0) {
836 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base()));
837 }
838
839 if (Universe::narrow_oop_shift() != 0) {
840 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
841 }
842
843 if (!Universe::narrow_oop_use_implicit_null_checks()) {
844 st->print(", no protected page in front of the heap");
845 }
846 st->cr();
847 }
848
849 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
850
851 assert(alignment <= Arguments::conservative_max_heap_alignment(),
852 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
853 alignment, Arguments::conservative_max_heap_alignment());
854
855 size_t total_reserved = align_up(heap_size, alignment);
856 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
857 "heap size is too big for compressed oops");
858
859 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size());
860 assert(!UseLargePages
861 || UseParallelGC
862 || use_large_pages, "Wrong alignment to use large pages");
863
864 // Now create the space.
865 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt);
866
867 if (total_rs.is_reserved()) {
868 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
869 "must be exactly of required size and alignment");
870 // We are good.
871
872 if (UseCompressedOops) {
873 // Universe::initialize_heap() will reset this to NULL if unscaled
874 // or zero-based narrow oops are actually used.
875 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
876 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
877 }
878
879 if (AllocateHeapAt != NULL) {
880 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
881 }
882 return total_rs;
883 }
884
885 vm_exit_during_initialization(
886 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
887 total_reserved/K));
888
889 // satisfy compiler
890 ShouldNotReachHere();
891 return ReservedHeapSpace(0, 0, false);
892 }
893
894
895 // It's the caller's responsibility to ensure glitch-freedom
896 // (if required).
897 void Universe::update_heap_info_at_gc() {
898 _heap_capacity_at_last_gc = heap()->capacity();
899 _heap_used_at_last_gc = heap()->used();
900 }
901
902
903 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) {
904 switch (mode) {
905 case UnscaledNarrowOop:
906 return "32-bit";
907 case ZeroBasedNarrowOop:
908 return "Zero based";
909 case DisjointBaseNarrowOop:
910 return "Non-zero disjoint base";
911 case HeapBasedNarrowOop:
912 return "Non-zero based";
913 default:
914 ShouldNotReachHere();
915 return "";
916 }
917 }
918
919
920 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() {
921 if (narrow_oop_base_disjoint()) {
922 return DisjointBaseNarrowOop;
923 }
924
925 if (narrow_oop_base() != 0) {
926 return HeapBasedNarrowOop;
927 }
928
929 if (narrow_oop_shift() != 0) {
930 return ZeroBasedNarrowOop;
931 }
932
933 return UnscaledNarrowOop;
934 }
935
936 void initialize_known_method(LatestMethodCache* method_cache,
937 InstanceKlass* ik,
938 const char* method,
939 Symbol* signature,
940 bool is_static, TRAPS)
941 {
942 TempNewSymbol name = SymbolTable::new_symbol(method, CHECK);
943 Method* m = NULL;
944 // The klass must be linked before looking up the method.
945 if (!ik->link_class_or_fail(THREAD) ||
946 ((m = ik->find_method(name, signature)) == NULL) ||
947 is_static != m->is_static()) {
948 ResourceMark rm(THREAD);
949 // NoSuchMethodException doesn't actually work because it tries to run the
950 // <init> function before java_lang_Class is linked. Print error and exit.
951 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
952 ik->name()->as_C_string(), method));
953 }
954 method_cache->init(ik, m);
955 }
956
957 void Universe::initialize_known_methods(TRAPS) {
958 // Set up static method for registering finalizers
959 initialize_known_method(_finalizer_register_cache,
960 SystemDictionary::Finalizer_klass(),
961 "register",
962 vmSymbols::object_void_signature(), true, CHECK);
963
964 initialize_known_method(_throw_illegal_access_error_cache,
965 SystemDictionary::internal_Unsafe_klass(),
966 "throwIllegalAccessError",
967 vmSymbols::void_method_signature(), true, CHECK);
968
969 // Set up method for registering loaded classes in class loader vector
970 initialize_known_method(_loader_addClass_cache,
971 SystemDictionary::ClassLoader_klass(),
972 "addClass",
973 vmSymbols::class_void_signature(), false, CHECK);
974
975 // Set up method for checking protection domain
976 initialize_known_method(_pd_implies_cache,
977 SystemDictionary::ProtectionDomain_klass(),
978 "impliesCreateAccessControlContext",
979 vmSymbols::void_boolean_signature(), false, CHECK);
980
981 // Set up method for stack walking
982 initialize_known_method(_do_stack_walk_cache,
983 SystemDictionary::AbstractStackWalker_klass(),
984 "doStackWalk",
985 vmSymbols::doStackWalk_signature(), false, CHECK);
986 }
987
988 void universe2_init() {
989 EXCEPTION_MARK;
990 Universe::genesis(CATCH);
991 }
992
993 // Set after initialization of the module runtime, call_initModuleRuntime
994 void universe_post_module_init() {
995 Universe::_module_initialized = true;
996 }
997
998 bool universe_post_init() {
999 assert(!is_init_completed(), "Error: initialization not yet completed!");
1000 Universe::_fully_initialized = true;
1001 EXCEPTION_MARK;
1002 { ResourceMark rm;
1003 Interpreter::initialize(); // needed for interpreter entry points
1004 if (!UseSharedSpaces) {
1005 HandleMark hm(THREAD);
1006 Klass* ok = SystemDictionary::Object_klass();
1007 Universe::reinitialize_vtable_of(ok, CHECK_false);
1008 Universe::reinitialize_itables(CHECK_false);
1009 }
1010 }
1011
1012 HandleMark hm(THREAD);
1013 // Setup preallocated empty java.lang.Class array
1014 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
1015
1016 // Setup preallocated OutOfMemoryError errors
1017 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
1018 InstanceKlass* ik = InstanceKlass::cast(k);
1019 Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false);
1020 Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false);
1021 Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false);
1022 Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false);
1023 Universe::_out_of_memory_error_gc_overhead_limit =
1024 ik->allocate_instance(CHECK_false);
1025 Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false);
1026
1027 // Setup preallocated cause message for delayed StackOverflowError
1028 if (StackReservedPages > 0) {
1029 Universe::_delayed_stack_overflow_error_message =
1030 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
1031 }
1032
1033 // Setup preallocated NullPointerException
1034 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1035 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
1036 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1037 // Setup preallocated ArithmeticException
1038 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1039 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
1040 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1041 // Virtual Machine Error for when we get into a situation we can't resolve
1042 k = SystemDictionary::resolve_or_fail(
1043 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
1044 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1045 if (!linked) {
1046 tty->print_cr("Unable to link/verify VirtualMachineError class");
1047 return false; // initialization failed
1048 }
1049 Universe::_virtual_machine_error_instance =
1050 InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1051
1052 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1053
1054 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
1055 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
1056
1057 msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
1058 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
1059 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
1060 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
1061
1062 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
1063 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
1064
1065 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
1066 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
1067
1068 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false);
1069 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg());
1070
1071 msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1072 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
1073
1074 // Setup the array of errors that have preallocated backtrace
1075 k = Universe::_out_of_memory_error_java_heap->klass();
1076 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
1077 ik = InstanceKlass::cast(k);
1078
1079 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
1080 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false);
1081 for (int i=0; i<len; i++) {
1082 oop err = ik->allocate_instance(CHECK_false);
1083 Handle err_h = Handle(THREAD, err);
1084 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
1085 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
1086 }
1087 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
1088
1089 Universe::initialize_known_methods(CHECK_false);
1090
1091 // This needs to be done before the first scavenge/gc, since
1092 // it's an input to soft ref clearing policy.
1093 {
1094 MutexLocker x(Heap_lock);
1095 Universe::update_heap_info_at_gc();
1096 }
1097
1098 // ("weak") refs processing infrastructure initialization
1099 Universe::heap()->post_initialize();
1100
1101 MemoryService::add_metaspace_memory_pools();
1102
1103 MemoryService::set_universe_heap(Universe::heap());
1104 #if INCLUDE_CDS
1105 SharedClassUtil::initialize(CHECK_false);
1106 #endif
1107 return true;
1108 }
1109
1110
1111 void Universe::compute_base_vtable_size() {
1112 _base_vtable_size = ClassLoader::compute_Object_vtable();
1113 }
1114
1115 void Universe::print_on(outputStream* st) {
1116 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1117 st->print_cr("Heap");
1118 heap()->print_on(st);
1119 }
1120
1121 void Universe::print_heap_at_SIGBREAK() {
1122 if (PrintHeapAtSIGBREAK) {
1123 print_on(tty);
1124 tty->cr();
1125 tty->flush();
1126 }
1127 }
1128
1129 void Universe::print_heap_before_gc() {
1130 LogTarget(Debug, gc, heap) lt;
1131 if (lt.is_enabled()) {
1132 LogStream ls(lt);
1133 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1134 ResourceMark rm;
1135 heap()->print_on(&ls);
1136 }
1137 }
1138
1139 void Universe::print_heap_after_gc() {
1140 LogTarget(Debug, gc, heap) lt;
1141 if (lt.is_enabled()) {
1142 LogStream ls(lt);
1143 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1144 ResourceMark rm;
1145 heap()->print_on(&ls);
1146 }
1147 }
1148
1149 void Universe::initialize_verify_flags() {
1150 verify_flags = 0;
1151 const char delimiter[] = " ,";
1152
1153 size_t length = strlen(VerifySubSet);
1154 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1155 strncpy(subset_list, VerifySubSet, length + 1);
1156
1157 char* token = strtok(subset_list, delimiter);
1158 while (token != NULL) {
1159 if (strcmp(token, "threads") == 0) {
1160 verify_flags |= Verify_Threads;
1161 } else if (strcmp(token, "heap") == 0) {
1162 verify_flags |= Verify_Heap;
1163 } else if (strcmp(token, "symbol_table") == 0) {
1164 verify_flags |= Verify_SymbolTable;
1165 } else if (strcmp(token, "string_table") == 0) {
1166 verify_flags |= Verify_StringTable;
1167 } else if (strcmp(token, "codecache") == 0) {
1168 verify_flags |= Verify_CodeCache;
1169 } else if (strcmp(token, "dictionary") == 0) {
1170 verify_flags |= Verify_SystemDictionary;
1171 } else if (strcmp(token, "classloader_data_graph") == 0) {
1172 verify_flags |= Verify_ClassLoaderDataGraph;
1173 } else if (strcmp(token, "metaspace") == 0) {
1174 verify_flags |= Verify_MetaspaceAux;
1175 } else if (strcmp(token, "jni_handles") == 0) {
1176 verify_flags |= Verify_JNIHandles;
1177 } else if (strcmp(token, "codecache_oops") == 0) {
1178 verify_flags |= Verify_CodeCacheOops;
1179 } else {
1180 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1181 }
1182 token = strtok(NULL, delimiter);
1183 }
1184 FREE_C_HEAP_ARRAY(char, subset_list);
1185 }
1186
1187 bool Universe::should_verify_subset(uint subset) {
1188 if (verify_flags & subset) {
1189 return true;
1190 }
1191 return false;
1192 }
1193
1194 void Universe::verify(VerifyOption option, const char* prefix) {
1195 // The use of _verify_in_progress is a temporary work around for
1196 // 6320749. Don't bother with a creating a class to set and clear
1197 // it since it is only used in this method and the control flow is
1198 // straight forward.
1199 _verify_in_progress = true;
1200
1201 COMPILER2_PRESENT(
1202 assert(!DerivedPointerTable::is_active(),
1203 "DPT should not be active during verification "
1204 "(of thread stacks below)");
1205 )
1206
1207 ResourceMark rm;
1208 HandleMark hm; // Handles created during verification can be zapped
1209 _verify_count++;
1210
1211 FormatBuffer<> title("Verifying %s", prefix);
1212 GCTraceTime(Info, gc, verify) tm(title.buffer());
1213 if (should_verify_subset(Verify_Threads)) {
1214 log_debug(gc, verify)("Threads");
1215 Threads::verify();
1216 }
1217 if (should_verify_subset(Verify_Heap)) {
1218 log_debug(gc, verify)("Heap");
1219 heap()->verify(option);
1220 }
1221 if (should_verify_subset(Verify_SymbolTable)) {
1222 log_debug(gc, verify)("SymbolTable");
1223 SymbolTable::verify();
1224 }
1225 if (should_verify_subset(Verify_StringTable)) {
1226 log_debug(gc, verify)("StringTable");
1227 StringTable::verify();
1228 }
1229 if (should_verify_subset(Verify_CodeCache)) {
1230 {
1231 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1232 log_debug(gc, verify)("CodeCache");
1233 CodeCache::verify();
1234 }
1235 }
1236 if (should_verify_subset(Verify_SystemDictionary)) {
1237 log_debug(gc, verify)("SystemDictionary");
1238 SystemDictionary::verify();
1239 }
1240 #ifndef PRODUCT
1241 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1242 log_debug(gc, verify)("ClassLoaderDataGraph");
1243 ClassLoaderDataGraph::verify();
1244 }
1245 #endif
1246 if (should_verify_subset(Verify_MetaspaceAux)) {
1247 log_debug(gc, verify)("MetaspaceAux");
1248 MetaspaceAux::verify_free_chunks();
1249 }
1250 if (should_verify_subset(Verify_JNIHandles)) {
1251 log_debug(gc, verify)("JNIHandles");
1252 JNIHandles::verify();
1253 }
1254 if (should_verify_subset(Verify_CodeCacheOops)) {
1255 log_debug(gc, verify)("CodeCache Oops");
1256 CodeCache::verify_oops();
1257 }
1258
1259 _verify_in_progress = false;
1260 }
1261
1262
1263 #ifndef PRODUCT
1264 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1265 assert(low_boundary < high_boundary, "bad interval");
1266
1267 // decide which low-order bits we require to be clear:
1268 size_t alignSize = MinObjAlignmentInBytes;
1269 size_t min_object_size = CollectedHeap::min_fill_size();
1270
1271 // make an inclusive limit:
1272 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1273 uintptr_t min = (uintptr_t)low_boundary;
1274 assert(min < max, "bad interval");
1275 uintptr_t diff = max ^ min;
1276
1277 // throw away enough low-order bits to make the diff vanish
1278 uintptr_t mask = (uintptr_t)(-1);
1279 while ((mask & diff) != 0)
1280 mask <<= 1;
1281 uintptr_t bits = (min & mask);
1282 assert(bits == (max & mask), "correct mask");
1283 // check an intermediate value between min and max, just to make sure:
1284 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1285
1286 // require address alignment, too:
1287 mask |= (alignSize - 1);
1288
1289 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1290 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1291 }
1292 _verify_oop_mask = mask;
1293 _verify_oop_bits = bits;
1294 }
1295
1296 // Oop verification (see MacroAssembler::verify_oop)
1297
1298 uintptr_t Universe::verify_oop_mask() {
1299 MemRegion m = heap()->reserved_region();
1300 calculate_verify_data(m.start(), m.end());
1301 return _verify_oop_mask;
1302 }
1303
1304 uintptr_t Universe::verify_oop_bits() {
1305 MemRegion m = heap()->reserved_region();
1306 calculate_verify_data(m.start(), m.end());
1307 return _verify_oop_bits;
1308 }
1309
1310 uintptr_t Universe::verify_mark_mask() {
1311 return markOopDesc::lock_mask_in_place;
1312 }
1313
1314 uintptr_t Universe::verify_mark_bits() {
1315 intptr_t mask = verify_mark_mask();
1316 intptr_t bits = (intptr_t)markOopDesc::prototype();
1317 assert((bits & ~mask) == 0, "no stray header bits");
1318 return bits;
1319 }
1320 #endif // PRODUCT
1321
1322
1323 void Universe::compute_verify_oop_data() {
1324 verify_oop_mask();
1325 verify_oop_bits();
1326 verify_mark_mask();
1327 verify_mark_bits();
1328 }
1329
1330
1331 void LatestMethodCache::init(Klass* k, Method* m) {
1332 if (!UseSharedSpaces) {
1333 _klass = k;
1334 }
1335 #ifndef PRODUCT
1336 else {
1337 // sharing initilization should have already set up _klass
1338 assert(_klass != NULL, "just checking");
1339 }
1340 #endif
1341
1342 _method_idnum = m->method_idnum();
1343 assert(_method_idnum >= 0, "sanity check");
1344 }
1345
1346
1347 Method* LatestMethodCache::get_method() {
1348 if (klass() == NULL) return NULL;
1349 InstanceKlass* ik = InstanceKlass::cast(klass());
1350 Method* m = ik->method_with_idnum(method_idnum());
1351 assert(m != NULL, "sanity check");
1352 return m;
1353 }
1354
1355
1356 #ifdef ASSERT
1357 // Release dummy object(s) at bottom of heap
1358 bool Universe::release_fullgc_alot_dummy() {
1359 MutexLocker ml(FullGCALot_lock);
1360 if (_fullgc_alot_dummy_array != NULL) {
1361 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
1362 // No more dummies to release, release entire array instead
1363 _fullgc_alot_dummy_array = NULL;
1364 return false;
1365 }
1366 if (!UseConcMarkSweepGC) {
1367 // Release dummy at bottom of old generation
1368 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1369 }
1370 // Release dummy at bottom of permanent generation
1371 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1372 }
1373 return true;
1374 }
1375
1376 #endif // ASSERT