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/gcLocker.inline.hpp"
38 #include "gc/shared/genCollectedHeap.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_ALL_GCS
86 #include "gc/cms/cmsCollectorPolicy.hpp"
87 #include "gc/g1/g1CollectedHeap.inline.hpp"
88 #include "gc/g1/g1CollectorPolicy.hpp"
89 #include "gc/parallel/parallelScavengeHeap.hpp"
90 #include "gc/shared/adaptiveSizePolicy.hpp"
91 #endif // INCLUDE_ALL_GCS
92 #if INCLUDE_CDS
93 #include "classfile/sharedClassUtil.hpp"
94 #endif
95
96 // Known objects
97 Klass* Universe::_boolArrayKlassObj = NULL;
98 Klass* Universe::_byteArrayKlassObj = NULL;
99 Klass* Universe::_charArrayKlassObj = NULL;
100 Klass* Universe::_intArrayKlassObj = NULL;
101 Klass* Universe::_shortArrayKlassObj = NULL;
102 Klass* Universe::_longArrayKlassObj = NULL;
103 Klass* Universe::_singleArrayKlassObj = NULL;
104 Klass* Universe::_doubleArrayKlassObj = NULL;
105 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ };
106 Klass* Universe::_objectArrayKlassObj = NULL;
107 oop Universe::_int_mirror = NULL;
108 oop Universe::_float_mirror = NULL;
109 oop Universe::_double_mirror = NULL;
110 oop Universe::_byte_mirror = NULL;
111 oop Universe::_bool_mirror = NULL;
112 oop Universe::_char_mirror = NULL;
113 oop Universe::_long_mirror = NULL;
114 oop Universe::_short_mirror = NULL;
115 oop Universe::_void_mirror = NULL;
116 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ };
117 oop Universe::_main_thread_group = NULL;
118 oop Universe::_system_thread_group = NULL;
119 objArrayOop Universe::_the_empty_class_klass_array = NULL;
120 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
121 oop Universe::_the_null_string = NULL;
122 oop Universe::_the_min_jint_string = NULL;
123 LatestMethodCache* Universe::_finalizer_register_cache = NULL;
124 LatestMethodCache* Universe::_loader_addClass_cache = NULL;
125 LatestMethodCache* Universe::_pd_implies_cache = NULL;
126 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL;
127 LatestMethodCache* Universe::_do_stack_walk_cache = NULL;
128 oop Universe::_out_of_memory_error_java_heap = NULL;
129 oop Universe::_out_of_memory_error_metaspace = NULL;
130 oop Universe::_out_of_memory_error_class_metaspace = NULL;
131 oop Universe::_out_of_memory_error_array_size = NULL;
132 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL;
133 oop Universe::_out_of_memory_error_realloc_objects = NULL;
134 oop Universe::_delayed_stack_overflow_error_message = NULL;
135 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL;
136 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
137 bool Universe::_verify_in_progress = false;
138 long Universe::verify_flags = Universe::Verify_All;
139 oop Universe::_null_ptr_exception_instance = NULL;
140 oop Universe::_arithmetic_exception_instance = NULL;
141 oop Universe::_virtual_machine_error_instance = NULL;
142 oop Universe::_vm_exception = NULL;
143 oop Universe::_allocation_context_notification_obj = NULL;
144 oop Universe::_reference_pending_list = NULL;
145
146 Array<int>* Universe::_the_empty_int_array = NULL;
147 Array<u2>* Universe::_the_empty_short_array = NULL;
148 Array<Klass*>* Universe::_the_empty_klass_array = NULL;
149 Array<Method*>* Universe::_the_empty_method_array = NULL;
150
151 // These variables are guarded by FullGCALot_lock.
152 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;)
153 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
154
155 // Heap
156 int Universe::_verify_count = 0;
157
158 // Oop verification (see MacroAssembler::verify_oop)
159 uintptr_t Universe::_verify_oop_mask = 0;
160 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
161
162 int Universe::_base_vtable_size = 0;
163 bool Universe::_bootstrapping = false;
164 bool Universe::_module_initialized = false;
165 bool Universe::_fully_initialized = false;
166
167 size_t Universe::_heap_capacity_at_last_gc;
168 size_t Universe::_heap_used_at_last_gc = 0;
169
170 CollectedHeap* Universe::_collectedHeap = NULL;
171
172 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true };
173 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true };
174 address Universe::_narrow_ptrs_base;
175
176 void Universe::basic_type_classes_do(void f(Klass*)) {
177 f(boolArrayKlassObj());
178 f(byteArrayKlassObj());
179 f(charArrayKlassObj());
180 f(intArrayKlassObj());
181 f(shortArrayKlassObj());
182 f(longArrayKlassObj());
183 f(singleArrayKlassObj());
184 f(doubleArrayKlassObj());
185 }
186
187 void Universe::oops_do(OopClosure* f, bool do_all) {
188
189 f->do_oop((oop*) &_int_mirror);
190 f->do_oop((oop*) &_float_mirror);
191 f->do_oop((oop*) &_double_mirror);
192 f->do_oop((oop*) &_byte_mirror);
193 f->do_oop((oop*) &_bool_mirror);
194 f->do_oop((oop*) &_char_mirror);
195 f->do_oop((oop*) &_long_mirror);
196 f->do_oop((oop*) &_short_mirror);
197 f->do_oop((oop*) &_void_mirror);
198
199 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
200 f->do_oop((oop*) &_mirrors[i]);
201 }
202 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
203
204 f->do_oop((oop*)&_the_empty_class_klass_array);
205 f->do_oop((oop*)&_the_null_string);
206 f->do_oop((oop*)&_the_min_jint_string);
207 f->do_oop((oop*)&_out_of_memory_error_java_heap);
208 f->do_oop((oop*)&_out_of_memory_error_metaspace);
209 f->do_oop((oop*)&_out_of_memory_error_class_metaspace);
210 f->do_oop((oop*)&_out_of_memory_error_array_size);
211 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit);
212 f->do_oop((oop*)&_out_of_memory_error_realloc_objects);
213 f->do_oop((oop*)&_delayed_stack_overflow_error_message);
214 f->do_oop((oop*)&_preallocated_out_of_memory_error_array);
215 f->do_oop((oop*)&_null_ptr_exception_instance);
216 f->do_oop((oop*)&_arithmetic_exception_instance);
217 f->do_oop((oop*)&_virtual_machine_error_instance);
218 f->do_oop((oop*)&_main_thread_group);
219 f->do_oop((oop*)&_system_thread_group);
220 f->do_oop((oop*)&_vm_exception);
221 f->do_oop((oop*)&_allocation_context_notification_obj);
222 f->do_oop((oop*)&_reference_pending_list);
223 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);)
224 }
225
226 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
227 it->push(&_klass);
228 }
229
230 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
231 it->push(&_boolArrayKlassObj);
232 it->push(&_byteArrayKlassObj);
233 it->push(&_charArrayKlassObj);
234 it->push(&_intArrayKlassObj);
235 it->push(&_shortArrayKlassObj);
236 it->push(&_longArrayKlassObj);
237 it->push(&_singleArrayKlassObj);
238 it->push(&_doubleArrayKlassObj);
239 for (int i = 0; i < T_VOID+1; i++) {
240 it->push(&_typeArrayKlassObjs[i]);
241 }
242 it->push(&_objectArrayKlassObj);
243
244 it->push(&_the_empty_int_array);
245 it->push(&_the_empty_short_array);
246 it->push(&_the_empty_klass_array);
247 it->push(&_the_empty_method_array);
248 it->push(&_the_array_interfaces_array);
249
250 _finalizer_register_cache->metaspace_pointers_do(it);
251 _loader_addClass_cache->metaspace_pointers_do(it);
252 _pd_implies_cache->metaspace_pointers_do(it);
253 _throw_illegal_access_error_cache->metaspace_pointers_do(it);
254 _do_stack_walk_cache->metaspace_pointers_do(it);
255 }
256
257 // Serialize metadata in and out of CDS archive, not oops.
258 void Universe::serialize(SerializeClosure* f, bool do_all) {
259
260 f->do_ptr((void**)&_boolArrayKlassObj);
261 f->do_ptr((void**)&_byteArrayKlassObj);
262 f->do_ptr((void**)&_charArrayKlassObj);
263 f->do_ptr((void**)&_intArrayKlassObj);
264 f->do_ptr((void**)&_shortArrayKlassObj);
265 f->do_ptr((void**)&_longArrayKlassObj);
266 f->do_ptr((void**)&_singleArrayKlassObj);
267 f->do_ptr((void**)&_doubleArrayKlassObj);
268 f->do_ptr((void**)&_objectArrayKlassObj);
269
270 {
271 for (int i = 0; i < T_VOID+1; i++) {
272 if (_typeArrayKlassObjs[i] != NULL) {
273 assert(i >= T_BOOLEAN, "checking");
274 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
275 } else if (do_all) {
276 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
277 }
278 }
279 }
280
281 f->do_ptr((void**)&_the_array_interfaces_array);
282 f->do_ptr((void**)&_the_empty_int_array);
283 f->do_ptr((void**)&_the_empty_short_array);
284 f->do_ptr((void**)&_the_empty_method_array);
285 f->do_ptr((void**)&_the_empty_klass_array);
286 _finalizer_register_cache->serialize(f);
287 _loader_addClass_cache->serialize(f);
288 _pd_implies_cache->serialize(f);
289 _throw_illegal_access_error_cache->serialize(f);
290 _do_stack_walk_cache->serialize(f);
291 }
292
293 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
294 if (size < alignment || size % alignment != 0) {
295 vm_exit_during_initialization(
296 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
297 }
298 }
299
300 void initialize_basic_type_klass(Klass* k, TRAPS) {
301 Klass* ok = SystemDictionary::Object_klass();
302 #if INCLUDE_CDS
303 if (UseSharedSpaces) {
304 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
305 assert(k->super() == ok, "u3");
306 k->restore_unshareable_info(loader_data, Handle(), CHECK);
307 } else
308 #endif
309 {
310 k->initialize_supers(ok, CHECK);
311 }
312 k->append_to_sibling_list();
313 }
314
315 void Universe::genesis(TRAPS) {
316 ResourceMark rm;
317
318 { FlagSetting fs(_bootstrapping, true);
319
320 { MutexLocker mc(Compile_lock);
321
322 java_lang_Class::allocate_fixup_lists();
323
324 // determine base vtable size; without that we cannot create the array klasses
325 compute_base_vtable_size();
326
327 if (!UseSharedSpaces) {
328 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK);
329 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK);
330 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK);
331 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK);
332 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK);
333 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK);
334 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK);
335 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK);
336
337 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj;
338 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj;
339 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj;
340 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj;
341 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj;
342 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj;
343 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj;
344 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj;
345
346 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
347
348 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
349 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
350 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
351 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
352 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
353 }
354 }
355
356 vmSymbols::initialize(CHECK);
357
358 SystemDictionary::initialize(CHECK);
359
360 Klass* ok = SystemDictionary::Object_klass();
361
362 _the_null_string = StringTable::intern("null", CHECK);
363 _the_min_jint_string = StringTable::intern("-2147483648", CHECK);
364
365 #if INCLUDE_CDS
366 if (UseSharedSpaces) {
367 // Verify shared interfaces array.
368 assert(_the_array_interfaces_array->at(0) ==
369 SystemDictionary::Cloneable_klass(), "u3");
370 assert(_the_array_interfaces_array->at(1) ==
371 SystemDictionary::Serializable_klass(), "u3");
372 MetaspaceShared::fixup_mapped_heap_regions();
373 } else
374 #endif
375 {
376 // Set up shared interfaces array. (Do this before supers are set up.)
377 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
378 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
379 }
380
381 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
382 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
383 initialize_basic_type_klass(singleArrayKlassObj(), CHECK);
384 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
385 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
386 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
387 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
388 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
389 } // end of core bootstrapping
390
391 // Maybe this could be lifted up now that object array can be initialized
392 // during the bootstrapping.
393
394 // OLD
395 // Initialize _objectArrayKlass after core bootstraping to make
396 // sure the super class is set up properly for _objectArrayKlass.
397 // ---
398 // NEW
399 // Since some of the old system object arrays have been converted to
400 // ordinary object arrays, _objectArrayKlass will be loaded when
401 // SystemDictionary::initialize(CHECK); is run. See the extra check
402 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
403 _objectArrayKlassObj = InstanceKlass::
404 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
405 // OLD
406 // Add the class to the class hierarchy manually to make sure that
407 // its vtable is initialized after core bootstrapping is completed.
408 // ---
409 // New
410 // Have already been initialized.
411 _objectArrayKlassObj->append_to_sibling_list();
412
413 #ifdef ASSERT
414 if (FullGCALot) {
415 // Allocate an array of dummy objects.
416 // We'd like these to be at the bottom of the old generation,
417 // so that when we free one and then collect,
418 // (almost) the whole heap moves
419 // and we find out if we actually update all the oops correctly.
420 // But we can't allocate directly in the old generation,
421 // so we allocate wherever, and hope that the first collection
422 // moves these objects to the bottom of the old generation.
423 // We can allocate directly in the permanent generation, so we do.
424 int size;
425 if (UseConcMarkSweepGC) {
426 log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate");
427 size = FullGCALotDummies;
428 } else {
429 size = FullGCALotDummies * 2;
430 }
431 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
432 objArrayHandle dummy_array(THREAD, naked_array);
433 int i = 0;
434 while (i < size) {
435 // Allocate dummy in old generation
436 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK);
437 dummy_array->obj_at_put(i++, dummy);
438 }
439 {
440 // Only modify the global variable inside the mutex.
441 // If we had a race to here, the other dummy_array instances
442 // and their elements just get dropped on the floor, which is fine.
443 MutexLocker ml(FullGCALot_lock);
444 if (_fullgc_alot_dummy_array == NULL) {
445 _fullgc_alot_dummy_array = dummy_array();
446 }
447 }
448 assert(i == _fullgc_alot_dummy_array->length(), "just checking");
449 }
450 #endif
451
452 // Initialize dependency array for null class loader
453 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK);
454
455 }
456
457 void Universe::initialize_basic_type_mirrors(TRAPS) {
458 assert(_int_mirror==NULL, "basic type mirrors already initialized");
459 _int_mirror =
460 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK);
461 _float_mirror =
462 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK);
463 _double_mirror =
464 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK);
465 _byte_mirror =
466 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK);
467 _bool_mirror =
468 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
469 _char_mirror =
470 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK);
471 _long_mirror =
472 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK);
473 _short_mirror =
474 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK);
475 _void_mirror =
476 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK);
477
478 _mirrors[T_INT] = _int_mirror;
479 _mirrors[T_FLOAT] = _float_mirror;
480 _mirrors[T_DOUBLE] = _double_mirror;
481 _mirrors[T_BYTE] = _byte_mirror;
482 _mirrors[T_BOOLEAN] = _bool_mirror;
483 _mirrors[T_CHAR] = _char_mirror;
484 _mirrors[T_LONG] = _long_mirror;
485 _mirrors[T_SHORT] = _short_mirror;
486 _mirrors[T_VOID] = _void_mirror;
487 //_mirrors[T_OBJECT] = _object_klass->java_mirror();
488 //_mirrors[T_ARRAY] = _object_klass->java_mirror();
489 }
490
491 void Universe::fixup_mirrors(TRAPS) {
492 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
493 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
494 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
495 // that the number of objects allocated at this point is very small.
496 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
497 HandleMark hm(THREAD);
498 // Cache the start of the static fields
499 InstanceMirrorKlass::init_offset_of_static_fields();
500
501 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
502 int list_length = list->length();
503 for (int i = 0; i < list_length; i++) {
504 Klass* k = list->at(i);
505 assert(k->is_klass(), "List should only hold classes");
506 EXCEPTION_MARK;
507 java_lang_Class::fixup_mirror(k, CATCH);
508 }
509 delete java_lang_Class::fixup_mirror_list();
510 java_lang_Class::set_fixup_mirror_list(NULL);
511 }
512
513 #define assert_pll_locked(test) \
514 assert(Heap_lock->test(), "Reference pending list access requires lock")
515
516 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
517
518 oop Universe::reference_pending_list() {
519 if (Thread::current()->is_VM_thread()) {
520 assert_pll_locked(is_locked);
521 } else {
522 assert_pll_ownership();
523 }
524 return _reference_pending_list;
525 }
526
527 void Universe::set_reference_pending_list(oop list) {
528 assert_pll_ownership();
529 _reference_pending_list = list;
530 }
531
532 bool Universe::has_reference_pending_list() {
533 assert_pll_ownership();
534 return _reference_pending_list != NULL;
535 }
536
537 oop Universe::swap_reference_pending_list(oop list) {
538 assert_pll_locked(is_locked);
539 return Atomic::xchg(list, &_reference_pending_list);
540 }
541
542 #undef assert_pll_locked
543 #undef assert_pll_ownership
544
545
546 static bool has_run_finalizers_on_exit = false;
547
548 void Universe::run_finalizers_on_exit() {
549 if (has_run_finalizers_on_exit) return;
550 has_run_finalizers_on_exit = true;
551
552 // Called on VM exit. This ought to be run in a separate thread.
553 log_trace(ref)("Callback to run finalizers on exit");
554 {
555 PRESERVE_EXCEPTION_MARK;
556 Klass* finalizer_klass = SystemDictionary::Finalizer_klass();
557 JavaValue result(T_VOID);
558 JavaCalls::call_static(
559 &result,
560 finalizer_klass,
561 vmSymbols::run_finalizers_on_exit_name(),
562 vmSymbols::void_method_signature(),
563 THREAD
564 );
565 // Ignore any pending exceptions
566 CLEAR_PENDING_EXCEPTION;
567 }
568 }
569
570
571 // initialize_vtable could cause gc if
572 // 1) we specified true to initialize_vtable and
573 // 2) this ran after gc was enabled
574 // In case those ever change we use handles for oops
575 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) {
576 // init vtable of k and all subclasses
577 ko->vtable().initialize_vtable(false, CHECK);
578 if (ko->is_instance_klass()) {
579 for (Klass* sk = ko->subklass();
580 sk != NULL;
581 sk = sk->next_sibling()) {
582 reinitialize_vtable_of(sk, CHECK);
583 }
584 }
585 }
586
587
588 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) {
589 k->itable().initialize_itable(false, CHECK);
590 }
591
592
593 void Universe::reinitialize_itables(TRAPS) {
594 ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK);
595 }
596
597
598 bool Universe::on_page_boundary(void* addr) {
599 return is_aligned(addr, os::vm_page_size());
600 }
601
602
603 bool Universe::should_fill_in_stack_trace(Handle throwable) {
604 // never attempt to fill in the stack trace of preallocated errors that do not have
605 // backtrace. These errors are kept alive forever and may be "re-used" when all
606 // preallocated errors with backtrace have been consumed. Also need to avoid
607 // a potential loop which could happen if an out of memory occurs when attempting
608 // to allocate the backtrace.
609 return ((throwable() != Universe::_out_of_memory_error_java_heap) &&
610 (throwable() != Universe::_out_of_memory_error_metaspace) &&
611 (throwable() != Universe::_out_of_memory_error_class_metaspace) &&
612 (throwable() != Universe::_out_of_memory_error_array_size) &&
613 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) &&
614 (throwable() != Universe::_out_of_memory_error_realloc_objects));
615 }
616
617
618 oop Universe::gen_out_of_memory_error(oop default_err) {
619 // generate an out of memory error:
620 // - if there is a preallocated error and stack traces are available
621 // (j.l.Throwable is initialized), then return the preallocated
622 // error with a filled in stack trace, and with the message
623 // provided by the default error.
624 // - otherwise, return the default error, without a stack trace.
625 int next;
626 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
627 SystemDictionary::Throwable_klass()->is_initialized()) {
628 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);
629 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
630 } else {
631 next = -1;
632 }
633 if (next < 0) {
634 // all preallocated errors have been used.
635 // return default
636 return default_err;
637 } else {
638 Thread* THREAD = Thread::current();
639 Handle default_err_h(THREAD, default_err);
640 // get the error object at the slot and set set it to NULL so that the
641 // array isn't keeping it alive anymore.
642 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next));
643 assert(exc() != NULL, "slot has been used already");
644 preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
645
646 // use the message from the default error
647 oop msg = java_lang_Throwable::message(default_err_h());
648 assert(msg != NULL, "no message");
649 java_lang_Throwable::set_message(exc(), msg);
650
651 // populate the stack trace and return it.
652 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
653 return exc();
654 }
655 }
656
657 intptr_t Universe::_non_oop_bits = 0;
658
659 void* Universe::non_oop_word() {
660 // Neither the high bits nor the low bits of this value is allowed
661 // to look like (respectively) the high or low bits of a real oop.
662 //
663 // High and low are CPU-specific notions, but low always includes
664 // the low-order bit. Since oops are always aligned at least mod 4,
665 // setting the low-order bit will ensure that the low half of the
666 // word will never look like that of a real oop.
667 //
668 // Using the OS-supplied non-memory-address word (usually 0 or -1)
669 // will take care of the high bits, however many there are.
670
671 if (_non_oop_bits == 0) {
672 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
673 }
674
675 return (void*)_non_oop_bits;
676 }
677
678 jint universe_init() {
679 assert(!Universe::_fully_initialized, "called after initialize_vtables");
680 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
681 "LogHeapWordSize is incorrect.");
682 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
683 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
684 "oop size is not not a multiple of HeapWord size");
685
686 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
687
688 JavaClasses::compute_hard_coded_offsets();
689
690 jint status = Universe::initialize_heap();
691 if (status != JNI_OK) {
692 return status;
693 }
694
695 Metaspace::global_initialize();
696
697 AOTLoader::universe_init();
698
699 // Checks 'AfterMemoryInit' constraints.
700 if (!CommandLineFlagConstraintList::check_constraints(CommandLineFlagConstraint::AfterMemoryInit)) {
701 return JNI_EINVAL;
702 }
703
704 // Create memory for metadata. Must be after initializing heap for
705 // DumpSharedSpaces.
706 ClassLoaderData::init_null_class_loader_data();
707
708 // We have a heap so create the Method* caches before
709 // Metaspace::initialize_shared_spaces() tries to populate them.
710 Universe::_finalizer_register_cache = new LatestMethodCache();
711 Universe::_loader_addClass_cache = new LatestMethodCache();
712 Universe::_pd_implies_cache = new LatestMethodCache();
713 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
714 Universe::_do_stack_walk_cache = new LatestMethodCache();
715
716 #if INCLUDE_CDS
717 if (UseSharedSpaces) {
718 // Read the data structures supporting the shared spaces (shared
719 // system dictionary, symbol table, etc.). After that, access to
720 // the file (other than the mapped regions) is no longer needed, and
721 // the file is closed. Closing the file does not affect the
722 // currently mapped regions.
723 MetaspaceShared::initialize_shared_spaces();
724 StringTable::create_table();
725 } else
726 #endif
727 {
728 SymbolTable::create_table();
729 StringTable::create_table();
730
731 #if INCLUDE_CDS
732 if (DumpSharedSpaces) {
733 MetaspaceShared::prepare_for_dumping();
734 }
735 #endif
736 }
737 if (strlen(VerifySubSet) > 0) {
738 Universe::initialize_verify_flags();
739 }
740
741 ResolvedMethodTable::create_table();
742
743 return JNI_OK;
744 }
745
746 CollectedHeap* Universe::create_heap() {
747 assert(_collectedHeap == NULL, "Heap already created");
748 #if !INCLUDE_ALL_GCS
749 if (UseParallelGC) {
750 fatal("UseParallelGC not supported in this VM.");
751 } else if (UseG1GC) {
752 fatal("UseG1GC not supported in this VM.");
753 } else if (UseConcMarkSweepGC) {
754 fatal("UseConcMarkSweepGC not supported in this VM.");
755 #else
756 if (UseParallelGC) {
757 return Universe::create_heap_with_policy<ParallelScavengeHeap, GenerationSizer>();
758 } else if (UseG1GC) {
759 return Universe::create_heap_with_policy<G1CollectedHeap, G1CollectorPolicy>();
760 } else if (UseConcMarkSweepGC) {
761 return Universe::create_heap_with_policy<GenCollectedHeap, ConcurrentMarkSweepPolicy>();
762 #endif
763 } else if (UseSerialGC) {
764 return Universe::create_heap_with_policy<GenCollectedHeap, MarkSweepPolicy>();
765 }
766
767 ShouldNotReachHere();
768 return NULL;
769 }
770
771 // Choose the heap base address and oop encoding mode
772 // when compressed oops are used:
773 // Unscaled - Use 32-bits oops without encoding when
774 // NarrowOopHeapBaseMin + heap_size < 4Gb
775 // ZeroBased - Use zero based compressed oops with encoding when
776 // NarrowOopHeapBaseMin + heap_size < 32Gb
777 // HeapBased - Use compressed oops with heap base + encoding.
778
779 jint Universe::initialize_heap() {
780 jint status = JNI_ERR;
781
782 _collectedHeap = create_heap_ext();
783 if (_collectedHeap == NULL) {
784 _collectedHeap = create_heap();
785 }
786
787 status = _collectedHeap->initialize();
788 if (status != JNI_OK) {
789 return status;
790 }
791 log_info(gc)("Using %s", _collectedHeap->name());
792
793 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
794
795 #ifdef _LP64
796 if (UseCompressedOops) {
797 // Subtract a page because something can get allocated at heap base.
798 // This also makes implicit null checking work, because the
799 // memory+1 page below heap_base needs to cause a signal.
800 // See needs_explicit_null_check.
801 // Only set the heap base for compressed oops because it indicates
802 // compressed oops for pstack code.
803 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) {
804 // Didn't reserve heap below 4Gb. Must shift.
805 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
806 }
807 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) {
808 // Did reserve heap below 32Gb. Can use base == 0;
809 Universe::set_narrow_oop_base(0);
810 }
811
812 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base());
813
814 LogTarget(Info, gc, heap, coops) lt;
815 if (lt.is_enabled()) {
816 ResourceMark rm;
817 LogStream ls(lt);
818 Universe::print_compressed_oops_mode(&ls);
819 }
820
821 // Tell tests in which mode we run.
822 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode",
823 narrow_oop_mode_to_string(narrow_oop_mode()),
824 false));
825 }
826 // Universe::narrow_oop_base() is one page below the heap.
827 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() -
828 os::vm_page_size()) ||
829 Universe::narrow_oop_base() == NULL, "invalid value");
830 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes ||
831 Universe::narrow_oop_shift() == 0, "invalid value");
832 #endif
833
834 // We will never reach the CATCH below since Exceptions::_throw will cause
835 // the VM to exit if an exception is thrown during initialization
836
837 if (UseTLAB) {
838 assert(Universe::heap()->supports_tlab_allocation(),
839 "Should support thread-local allocation buffers");
840 ThreadLocalAllocBuffer::startup_initialization();
841 }
842 return JNI_OK;
843 }
844
845 void Universe::print_compressed_oops_mode(outputStream* st) {
846 st->print("Heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
847 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M);
848
849 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode()));
850
851 if (Universe::narrow_oop_base() != 0) {
852 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base()));
853 }
854
855 if (Universe::narrow_oop_shift() != 0) {
856 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
857 }
858
859 if (!Universe::narrow_oop_use_implicit_null_checks()) {
860 st->print(", no protected page in front of the heap");
861 }
862 st->cr();
863 }
864
865 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
866
867 assert(alignment <= Arguments::conservative_max_heap_alignment(),
868 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
869 alignment, Arguments::conservative_max_heap_alignment());
870
871 size_t total_reserved = align_up(heap_size, alignment);
872 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
873 "heap size is too big for compressed oops");
874
875 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size());
876 assert(!UseLargePages
877 || UseParallelGC
878 || use_large_pages, "Wrong alignment to use large pages");
879
880 // Now create the space.
881 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages);
882
883 if (total_rs.is_reserved()) {
884 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
885 "must be exactly of required size and alignment");
886 // We are good.
887
888 if (UseCompressedOops) {
889 // Universe::initialize_heap() will reset this to NULL if unscaled
890 // or zero-based narrow oops are actually used.
891 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
892 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
893 }
894
895 return total_rs;
896 }
897
898 vm_exit_during_initialization(
899 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
900 total_reserved/K));
901
902 // satisfy compiler
903 ShouldNotReachHere();
904 return ReservedHeapSpace(0, 0, false);
905 }
906
907
908 // It's the caller's responsibility to ensure glitch-freedom
909 // (if required).
910 void Universe::update_heap_info_at_gc() {
911 _heap_capacity_at_last_gc = heap()->capacity();
912 _heap_used_at_last_gc = heap()->used();
913 }
914
915
916 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) {
917 switch (mode) {
918 case UnscaledNarrowOop:
919 return "32-bit";
920 case ZeroBasedNarrowOop:
921 return "Zero based";
922 case DisjointBaseNarrowOop:
923 return "Non-zero disjoint base";
924 case HeapBasedNarrowOop:
925 return "Non-zero based";
926 default:
927 ShouldNotReachHere();
928 return "";
929 }
930 }
931
932
933 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() {
934 if (narrow_oop_base_disjoint()) {
935 return DisjointBaseNarrowOop;
936 }
937
938 if (narrow_oop_base() != 0) {
939 return HeapBasedNarrowOop;
940 }
941
942 if (narrow_oop_shift() != 0) {
943 return ZeroBasedNarrowOop;
944 }
945
946 return UnscaledNarrowOop;
947 }
948
949 void initialize_known_method(LatestMethodCache* method_cache,
950 InstanceKlass* ik,
951 const char* method,
952 Symbol* signature,
953 bool is_static, TRAPS)
954 {
955 TempNewSymbol name = SymbolTable::new_symbol(method, CHECK);
956 Method* m = NULL;
957 // The klass must be linked before looking up the method.
958 if (!ik->link_class_or_fail(THREAD) ||
959 ((m = ik->find_method(name, signature)) == NULL) ||
960 is_static != m->is_static()) {
961 ResourceMark rm(THREAD);
962 // NoSuchMethodException doesn't actually work because it tries to run the
963 // <init> function before java_lang_Class is linked. Print error and exit.
964 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
965 ik->name()->as_C_string(), method));
966 }
967 method_cache->init(ik, m);
968 }
969
970 void Universe::initialize_known_methods(TRAPS) {
971 // Set up static method for registering finalizers
972 initialize_known_method(_finalizer_register_cache,
973 SystemDictionary::Finalizer_klass(),
974 "register",
975 vmSymbols::object_void_signature(), true, CHECK);
976
977 initialize_known_method(_throw_illegal_access_error_cache,
978 SystemDictionary::internal_Unsafe_klass(),
979 "throwIllegalAccessError",
980 vmSymbols::void_method_signature(), true, CHECK);
981
982 // Set up method for registering loaded classes in class loader vector
983 initialize_known_method(_loader_addClass_cache,
984 SystemDictionary::ClassLoader_klass(),
985 "addClass",
986 vmSymbols::class_void_signature(), false, CHECK);
987
988 // Set up method for checking protection domain
989 initialize_known_method(_pd_implies_cache,
990 SystemDictionary::ProtectionDomain_klass(),
991 "impliesCreateAccessControlContext",
992 vmSymbols::void_boolean_signature(), false, CHECK);
993
994 // Set up method for stack walking
995 initialize_known_method(_do_stack_walk_cache,
996 SystemDictionary::AbstractStackWalker_klass(),
997 "doStackWalk",
998 vmSymbols::doStackWalk_signature(), false, CHECK);
999 }
1000
1001 void universe2_init() {
1002 EXCEPTION_MARK;
1003 Universe::genesis(CATCH);
1004 }
1005
1006 // Set after initialization of the module runtime, call_initModuleRuntime
1007 void universe_post_module_init() {
1008 Universe::_module_initialized = true;
1009 }
1010
1011 bool universe_post_init() {
1012 assert(!is_init_completed(), "Error: initialization not yet completed!");
1013 Universe::_fully_initialized = true;
1014 EXCEPTION_MARK;
1015 { ResourceMark rm;
1016 Interpreter::initialize(); // needed for interpreter entry points
1017 if (!UseSharedSpaces) {
1018 HandleMark hm(THREAD);
1019 Klass* ok = SystemDictionary::Object_klass();
1020 Universe::reinitialize_vtable_of(ok, CHECK_false);
1021 Universe::reinitialize_itables(CHECK_false);
1022 }
1023 }
1024
1025 HandleMark hm(THREAD);
1026 // Setup preallocated empty java.lang.Class array
1027 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
1028
1029 // Setup preallocated OutOfMemoryError errors
1030 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
1031 InstanceKlass* ik = InstanceKlass::cast(k);
1032 Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false);
1033 Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false);
1034 Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false);
1035 Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false);
1036 Universe::_out_of_memory_error_gc_overhead_limit =
1037 ik->allocate_instance(CHECK_false);
1038 Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false);
1039
1040 // Setup preallocated cause message for delayed StackOverflowError
1041 if (StackReservedPages > 0) {
1042 Universe::_delayed_stack_overflow_error_message =
1043 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
1044 }
1045
1046 // Setup preallocated NullPointerException
1047 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1048 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
1049 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1050 // Setup preallocated ArithmeticException
1051 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1052 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
1053 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1054 // Virtual Machine Error for when we get into a situation we can't resolve
1055 k = SystemDictionary::resolve_or_fail(
1056 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
1057 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1058 if (!linked) {
1059 tty->print_cr("Unable to link/verify VirtualMachineError class");
1060 return false; // initialization failed
1061 }
1062 Universe::_virtual_machine_error_instance =
1063 InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1064
1065 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1066
1067 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
1068 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
1069
1070 msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
1071 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
1072 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
1073 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
1074
1075 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
1076 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
1077
1078 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
1079 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
1080
1081 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false);
1082 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg());
1083
1084 msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1085 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
1086
1087 // Setup the array of errors that have preallocated backtrace
1088 k = Universe::_out_of_memory_error_java_heap->klass();
1089 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
1090 ik = InstanceKlass::cast(k);
1091
1092 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
1093 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false);
1094 for (int i=0; i<len; i++) {
1095 oop err = ik->allocate_instance(CHECK_false);
1096 Handle err_h = Handle(THREAD, err);
1097 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
1098 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
1099 }
1100 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
1101
1102 Universe::initialize_known_methods(CHECK_false);
1103
1104 // This needs to be done before the first scavenge/gc, since
1105 // it's an input to soft ref clearing policy.
1106 {
1107 MutexLocker x(Heap_lock);
1108 Universe::update_heap_info_at_gc();
1109 }
1110
1111 // ("weak") refs processing infrastructure initialization
1112 Universe::heap()->post_initialize();
1113
1114 // Initialize performance counters for metaspaces
1115 MetaspaceCounters::initialize_performance_counters();
1116 CompressedClassSpaceCounters::initialize_performance_counters();
1117
1118 MemoryService::add_metaspace_memory_pools();
1119
1120 MemoryService::set_universe_heap(Universe::heap());
1121 #if INCLUDE_CDS
1122 SharedClassUtil::initialize(CHECK_false);
1123 #endif
1124 return true;
1125 }
1126
1127
1128 void Universe::compute_base_vtable_size() {
1129 _base_vtable_size = ClassLoader::compute_Object_vtable();
1130 }
1131
1132 void Universe::print_on(outputStream* st) {
1133 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1134 st->print_cr("Heap");
1135 heap()->print_on(st);
1136 }
1137
1138 void Universe::print_heap_at_SIGBREAK() {
1139 if (PrintHeapAtSIGBREAK) {
1140 print_on(tty);
1141 tty->cr();
1142 tty->flush();
1143 }
1144 }
1145
1146 void Universe::print_heap_before_gc() {
1147 LogTarget(Debug, gc, heap) lt;
1148 if (lt.is_enabled()) {
1149 LogStream ls(lt);
1150 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1151 ResourceMark rm;
1152 heap()->print_on(&ls);
1153 }
1154 }
1155
1156 void Universe::print_heap_after_gc() {
1157 LogTarget(Debug, gc, heap) lt;
1158 if (lt.is_enabled()) {
1159 LogStream ls(lt);
1160 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1161 ResourceMark rm;
1162 heap()->print_on(&ls);
1163 }
1164 }
1165
1166 void Universe::initialize_verify_flags() {
1167 verify_flags = 0;
1168 const char delimiter[] = " ,";
1169
1170 size_t length = strlen(VerifySubSet);
1171 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1172 strncpy(subset_list, VerifySubSet, length + 1);
1173
1174 char* token = strtok(subset_list, delimiter);
1175 while (token != NULL) {
1176 if (strcmp(token, "threads") == 0) {
1177 verify_flags |= Verify_Threads;
1178 } else if (strcmp(token, "heap") == 0) {
1179 verify_flags |= Verify_Heap;
1180 } else if (strcmp(token, "symbol_table") == 0) {
1181 verify_flags |= Verify_SymbolTable;
1182 } else if (strcmp(token, "string_table") == 0) {
1183 verify_flags |= Verify_StringTable;
1184 } else if (strcmp(token, "codecache") == 0) {
1185 verify_flags |= Verify_CodeCache;
1186 } else if (strcmp(token, "dictionary") == 0) {
1187 verify_flags |= Verify_SystemDictionary;
1188 } else if (strcmp(token, "classloader_data_graph") == 0) {
1189 verify_flags |= Verify_ClassLoaderDataGraph;
1190 } else if (strcmp(token, "metaspace") == 0) {
1191 verify_flags |= Verify_MetaspaceAux;
1192 } else if (strcmp(token, "jni_handles") == 0) {
1193 verify_flags |= Verify_JNIHandles;
1194 } else if (strcmp(token, "codecache_oops") == 0) {
1195 verify_flags |= Verify_CodeCacheOops;
1196 } else {
1197 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1198 }
1199 token = strtok(NULL, delimiter);
1200 }
1201 FREE_C_HEAP_ARRAY(char, subset_list);
1202 }
1203
1204 bool Universe::should_verify_subset(uint subset) {
1205 if (verify_flags & subset) {
1206 return true;
1207 }
1208 return false;
1209 }
1210
1211 void Universe::verify(VerifyOption option, const char* prefix) {
1212 // The use of _verify_in_progress is a temporary work around for
1213 // 6320749. Don't bother with a creating a class to set and clear
1214 // it since it is only used in this method and the control flow is
1215 // straight forward.
1216 _verify_in_progress = true;
1217
1218 COMPILER2_PRESENT(
1219 assert(!DerivedPointerTable::is_active(),
1220 "DPT should not be active during verification "
1221 "(of thread stacks below)");
1222 )
1223
1224 ResourceMark rm;
1225 HandleMark hm; // Handles created during verification can be zapped
1226 _verify_count++;
1227
1228 FormatBuffer<> title("Verifying %s", prefix);
1229 GCTraceTime(Info, gc, verify) tm(title.buffer());
1230 if (should_verify_subset(Verify_Threads)) {
1231 log_debug(gc, verify)("Threads");
1232 Threads::verify();
1233 }
1234 if (should_verify_subset(Verify_Heap)) {
1235 log_debug(gc, verify)("Heap");
1236 heap()->verify(option);
1237 }
1238 if (should_verify_subset(Verify_SymbolTable)) {
1239 log_debug(gc, verify)("SymbolTable");
1240 SymbolTable::verify();
1241 }
1242 if (should_verify_subset(Verify_StringTable)) {
1243 log_debug(gc, verify)("StringTable");
1244 StringTable::verify();
1245 }
1246 if (should_verify_subset(Verify_CodeCache)) {
1247 {
1248 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1249 log_debug(gc, verify)("CodeCache");
1250 CodeCache::verify();
1251 }
1252 }
1253 if (should_verify_subset(Verify_SystemDictionary)) {
1254 log_debug(gc, verify)("SystemDictionary");
1255 SystemDictionary::verify();
1256 }
1257 #ifndef PRODUCT
1258 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1259 log_debug(gc, verify)("ClassLoaderDataGraph");
1260 ClassLoaderDataGraph::verify();
1261 }
1262 #endif
1263 if (should_verify_subset(Verify_MetaspaceAux)) {
1264 log_debug(gc, verify)("MetaspaceAux");
1265 MetaspaceAux::verify_free_chunks();
1266 }
1267 if (should_verify_subset(Verify_JNIHandles)) {
1268 log_debug(gc, verify)("JNIHandles");
1269 JNIHandles::verify();
1270 }
1271 if (should_verify_subset(Verify_CodeCacheOops)) {
1272 log_debug(gc, verify)("CodeCache Oops");
1273 CodeCache::verify_oops();
1274 }
1275
1276 _verify_in_progress = false;
1277 }
1278
1279
1280 #ifndef PRODUCT
1281 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1282 assert(low_boundary < high_boundary, "bad interval");
1283
1284 // decide which low-order bits we require to be clear:
1285 size_t alignSize = MinObjAlignmentInBytes;
1286 size_t min_object_size = CollectedHeap::min_fill_size();
1287
1288 // make an inclusive limit:
1289 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1290 uintptr_t min = (uintptr_t)low_boundary;
1291 assert(min < max, "bad interval");
1292 uintptr_t diff = max ^ min;
1293
1294 // throw away enough low-order bits to make the diff vanish
1295 uintptr_t mask = (uintptr_t)(-1);
1296 while ((mask & diff) != 0)
1297 mask <<= 1;
1298 uintptr_t bits = (min & mask);
1299 assert(bits == (max & mask), "correct mask");
1300 // check an intermediate value between min and max, just to make sure:
1301 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1302
1303 // require address alignment, too:
1304 mask |= (alignSize - 1);
1305
1306 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1307 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1308 }
1309 _verify_oop_mask = mask;
1310 _verify_oop_bits = bits;
1311 }
1312
1313 // Oop verification (see MacroAssembler::verify_oop)
1314
1315 uintptr_t Universe::verify_oop_mask() {
1316 MemRegion m = heap()->reserved_region();
1317 calculate_verify_data(m.start(), m.end());
1318 return _verify_oop_mask;
1319 }
1320
1321 uintptr_t Universe::verify_oop_bits() {
1322 MemRegion m = heap()->reserved_region();
1323 calculate_verify_data(m.start(), m.end());
1324 return _verify_oop_bits;
1325 }
1326
1327 uintptr_t Universe::verify_mark_mask() {
1328 return markOopDesc::lock_mask_in_place;
1329 }
1330
1331 uintptr_t Universe::verify_mark_bits() {
1332 intptr_t mask = verify_mark_mask();
1333 intptr_t bits = (intptr_t)markOopDesc::prototype();
1334 assert((bits & ~mask) == 0, "no stray header bits");
1335 return bits;
1336 }
1337 #endif // PRODUCT
1338
1339
1340 void Universe::compute_verify_oop_data() {
1341 verify_oop_mask();
1342 verify_oop_bits();
1343 verify_mark_mask();
1344 verify_mark_bits();
1345 }
1346
1347
1348 void LatestMethodCache::init(Klass* k, Method* m) {
1349 if (!UseSharedSpaces) {
1350 _klass = k;
1351 }
1352 #ifndef PRODUCT
1353 else {
1354 // sharing initilization should have already set up _klass
1355 assert(_klass != NULL, "just checking");
1356 }
1357 #endif
1358
1359 _method_idnum = m->method_idnum();
1360 assert(_method_idnum >= 0, "sanity check");
1361 }
1362
1363
1364 Method* LatestMethodCache::get_method() {
1365 if (klass() == NULL) return NULL;
1366 InstanceKlass* ik = InstanceKlass::cast(klass());
1367 Method* m = ik->method_with_idnum(method_idnum());
1368 assert(m != NULL, "sanity check");
1369 return m;
1370 }
1371
1372
1373 #ifdef ASSERT
1374 // Release dummy object(s) at bottom of heap
1375 bool Universe::release_fullgc_alot_dummy() {
1376 MutexLocker ml(FullGCALot_lock);
1377 if (_fullgc_alot_dummy_array != NULL) {
1378 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
1379 // No more dummies to release, release entire array instead
1380 _fullgc_alot_dummy_array = NULL;
1381 return false;
1382 }
1383 if (!UseConcMarkSweepGC) {
1384 // Release dummy at bottom of old generation
1385 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1386 }
1387 // Release dummy at bottom of permanent generation
1388 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1389 }
1390 return true;
1391 }
1392
1393 #endif // ASSERT