1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "aot/aotLoader.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/classLoaderData.hpp"
29 #include "classfile/javaClasses.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/vmSymbols.hpp"
33 #include "code/codeCache.hpp"
34 #include "code/dependencies.hpp"
35 #include "gc/shared/collectedHeap.inline.hpp"
36 #include "gc/shared/gcArguments.hpp"
37 #include "gc/shared/gcConfig.hpp"
38 #include "gc/shared/gcTraceTime.inline.hpp"
39 #include "interpreter/interpreter.hpp"
40 #include "logging/log.hpp"
41 #include "logging/logStream.hpp"
42 #include "memory/filemap.hpp"
43 #include "memory/metadataFactory.hpp"
44 #include "memory/metaspaceClosure.hpp"
45 #include "memory/metaspaceCounters.hpp"
46 #include "memory/metaspaceShared.hpp"
47 #include "memory/oopFactory.hpp"
48 #include "memory/resourceArea.hpp"
49 #include "memory/universe.hpp"
50 #include "memory/universe.hpp"
51 #include "oops/constantPool.hpp"
52 #include "oops/instanceClassLoaderKlass.hpp"
53 #include "oops/instanceKlass.hpp"
54 #include "oops/instanceMirrorKlass.hpp"
55 #include "oops/instanceRefKlass.hpp"
56 #include "oops/objArrayOop.inline.hpp"
57 #include "oops/oop.inline.hpp"
58 #include "oops/typeArrayKlass.hpp"
59 #include "prims/resolvedMethodTable.hpp"
60 #include "runtime/arguments.hpp"
61 #include "runtime/atomic.hpp"
62 #include "runtime/flags/flagSetting.hpp"
63 #include "runtime/flags/jvmFlagConstraintList.hpp"
64 #include "runtime/deoptimization.hpp"
65 #include "runtime/handles.inline.hpp"
66 #include "runtime/init.hpp"
67 #include "runtime/java.hpp"
68 #include "runtime/javaCalls.hpp"
69 #include "runtime/sharedRuntime.hpp"
70 #include "runtime/synchronizer.hpp"
71 #include "runtime/thread.inline.hpp"
72 #include "runtime/timerTrace.hpp"
73 #include "runtime/vm_operations.hpp"
74 #include "services/memoryService.hpp"
75 #include "utilities/align.hpp"
76 #include "utilities/copy.hpp"
77 #include "utilities/debug.hpp"
78 #include "utilities/events.hpp"
79 #include "utilities/formatBuffer.hpp"
80 #include "utilities/hashtable.inline.hpp"
81 #include "utilities/macros.hpp"
82 #include "utilities/ostream.hpp"
83 #include "utilities/preserveException.hpp"
84
85 // Known objects
86 Klass* Universe::_boolArrayKlassObj = NULL;
87 Klass* Universe::_byteArrayKlassObj = NULL;
88 Klass* Universe::_charArrayKlassObj = NULL;
89 Klass* Universe::_intArrayKlassObj = NULL;
90 Klass* Universe::_shortArrayKlassObj = NULL;
91 Klass* Universe::_longArrayKlassObj = NULL;
92 Klass* Universe::_singleArrayKlassObj = NULL;
93 Klass* Universe::_doubleArrayKlassObj = NULL;
94 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ };
95 Klass* Universe::_objectArrayKlassObj = NULL;
96 oop Universe::_int_mirror = NULL;
97 oop Universe::_float_mirror = NULL;
98 oop Universe::_double_mirror = NULL;
99 oop Universe::_byte_mirror = NULL;
100 oop Universe::_bool_mirror = NULL;
101 oop Universe::_char_mirror = NULL;
102 oop Universe::_long_mirror = NULL;
103 oop Universe::_short_mirror = NULL;
104 oop Universe::_void_mirror = NULL;
105 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ };
106 oop Universe::_main_thread_group = NULL;
107 oop Universe::_system_thread_group = NULL;
108 objArrayOop Universe::_the_empty_class_klass_array = NULL;
109 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
110 oop Universe::_the_null_sentinel = NULL;
111 oop Universe::_the_null_string = NULL;
112 oop Universe::_the_min_jint_string = NULL;
113 LatestMethodCache* Universe::_finalizer_register_cache = NULL;
114 LatestMethodCache* Universe::_loader_addClass_cache = NULL;
115 LatestMethodCache* Universe::_pd_implies_cache = NULL;
116 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL;
117 LatestMethodCache* Universe::_do_stack_walk_cache = NULL;
118 oop Universe::_out_of_memory_error_java_heap = NULL;
119 oop Universe::_out_of_memory_error_metaspace = NULL;
120 oop Universe::_out_of_memory_error_class_metaspace = NULL;
121 oop Universe::_out_of_memory_error_array_size = NULL;
122 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL;
123 oop Universe::_out_of_memory_error_realloc_objects = NULL;
124 oop Universe::_delayed_stack_overflow_error_message = NULL;
125 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL;
126 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
127 bool Universe::_verify_in_progress = false;
128 long Universe::verify_flags = Universe::Verify_All;
129 oop Universe::_null_ptr_exception_instance = NULL;
130 oop Universe::_arithmetic_exception_instance = NULL;
131 oop Universe::_virtual_machine_error_instance = NULL;
132 oop Universe::_vm_exception = NULL;
133 oop Universe::_reference_pending_list = NULL;
134
135 Array<int>* Universe::_the_empty_int_array = NULL;
136 Array<u2>* Universe::_the_empty_short_array = NULL;
137 Array<Klass*>* Universe::_the_empty_klass_array = NULL;
138 Array<Method*>* Universe::_the_empty_method_array = NULL;
139
140 // These variables are guarded by FullGCALot_lock.
141 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;)
142 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
143
144 // Heap
145 int Universe::_verify_count = 0;
146
147 // Oop verification (see MacroAssembler::verify_oop)
148 uintptr_t Universe::_verify_oop_mask = 0;
149 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
150
151 int Universe::_base_vtable_size = 0;
152 bool Universe::_bootstrapping = false;
153 bool Universe::_module_initialized = false;
154 bool Universe::_fully_initialized = false;
155
156 size_t Universe::_heap_capacity_at_last_gc;
157 size_t Universe::_heap_used_at_last_gc = 0;
158
159 CollectedHeap* Universe::_collectedHeap = NULL;
160
161 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true };
162 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true };
163 address Universe::_narrow_ptrs_base;
164 uint64_t Universe::_narrow_klass_range = (uint64_t(max_juint)+1);
165
166 void Universe::basic_type_classes_do(void f(Klass*)) {
167 f(boolArrayKlassObj());
168 f(byteArrayKlassObj());
169 f(charArrayKlassObj());
170 f(intArrayKlassObj());
171 f(shortArrayKlassObj());
172 f(longArrayKlassObj());
173 f(singleArrayKlassObj());
174 f(doubleArrayKlassObj());
175 }
176
177 void Universe::oops_do(OopClosure* f, bool do_all) {
178
179 f->do_oop((oop*) &_int_mirror);
180 f->do_oop((oop*) &_float_mirror);
181 f->do_oop((oop*) &_double_mirror);
182 f->do_oop((oop*) &_byte_mirror);
183 f->do_oop((oop*) &_bool_mirror);
184 f->do_oop((oop*) &_char_mirror);
185 f->do_oop((oop*) &_long_mirror);
186 f->do_oop((oop*) &_short_mirror);
187 f->do_oop((oop*) &_void_mirror);
188
189 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
190 f->do_oop((oop*) &_mirrors[i]);
191 }
192 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
193
194 f->do_oop((oop*)&_the_empty_class_klass_array);
195 f->do_oop((oop*)&_the_null_sentinel);
196 f->do_oop((oop*)&_the_null_string);
197 f->do_oop((oop*)&_the_min_jint_string);
198 f->do_oop((oop*)&_out_of_memory_error_java_heap);
199 f->do_oop((oop*)&_out_of_memory_error_metaspace);
200 f->do_oop((oop*)&_out_of_memory_error_class_metaspace);
201 f->do_oop((oop*)&_out_of_memory_error_array_size);
202 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit);
203 f->do_oop((oop*)&_out_of_memory_error_realloc_objects);
204 f->do_oop((oop*)&_delayed_stack_overflow_error_message);
205 f->do_oop((oop*)&_preallocated_out_of_memory_error_array);
206 f->do_oop((oop*)&_null_ptr_exception_instance);
207 f->do_oop((oop*)&_arithmetic_exception_instance);
208 f->do_oop((oop*)&_virtual_machine_error_instance);
209 f->do_oop((oop*)&_main_thread_group);
210 f->do_oop((oop*)&_system_thread_group);
211 f->do_oop((oop*)&_vm_exception);
212 f->do_oop((oop*)&_reference_pending_list);
213 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);)
214 }
215
216 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
217 it->push(&_klass);
218 }
219
220 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
221 it->push(&_boolArrayKlassObj);
222 it->push(&_byteArrayKlassObj);
223 it->push(&_charArrayKlassObj);
224 it->push(&_intArrayKlassObj);
225 it->push(&_shortArrayKlassObj);
226 it->push(&_longArrayKlassObj);
227 it->push(&_singleArrayKlassObj);
228 it->push(&_doubleArrayKlassObj);
229 for (int i = 0; i < T_VOID+1; i++) {
230 it->push(&_typeArrayKlassObjs[i]);
231 }
232 it->push(&_objectArrayKlassObj);
233
234 it->push(&_the_empty_int_array);
235 it->push(&_the_empty_short_array);
236 it->push(&_the_empty_klass_array);
237 it->push(&_the_empty_method_array);
238 it->push(&_the_array_interfaces_array);
239
240 _finalizer_register_cache->metaspace_pointers_do(it);
241 _loader_addClass_cache->metaspace_pointers_do(it);
242 _pd_implies_cache->metaspace_pointers_do(it);
243 _throw_illegal_access_error_cache->metaspace_pointers_do(it);
244 _do_stack_walk_cache->metaspace_pointers_do(it);
245 }
246
247 // Serialize metadata and pointers to primitive type mirrors in and out of CDS archive
248 void Universe::serialize(SerializeClosure* f, bool do_all) {
249
250 f->do_ptr((void**)&_boolArrayKlassObj);
251 f->do_ptr((void**)&_byteArrayKlassObj);
252 f->do_ptr((void**)&_charArrayKlassObj);
253 f->do_ptr((void**)&_intArrayKlassObj);
254 f->do_ptr((void**)&_shortArrayKlassObj);
255 f->do_ptr((void**)&_longArrayKlassObj);
256 f->do_ptr((void**)&_singleArrayKlassObj);
257 f->do_ptr((void**)&_doubleArrayKlassObj);
258 f->do_ptr((void**)&_objectArrayKlassObj);
259
260 {
261 for (int i = 0; i < T_VOID+1; i++) {
262 if (_typeArrayKlassObjs[i] != NULL) {
263 assert(i >= T_BOOLEAN, "checking");
264 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
265 } else if (do_all) {
266 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
267 }
268 }
269 }
270
271 #if INCLUDE_CDS_JAVA_HEAP
272 // The mirrors are NULL if MetaspaceShared::is_heap_object_archiving_allowed
273 // is false.
274 f->do_oop(&_int_mirror);
275 f->do_oop(&_float_mirror);
276 f->do_oop(&_double_mirror);
277 f->do_oop(&_byte_mirror);
278 f->do_oop(&_bool_mirror);
279 f->do_oop(&_char_mirror);
280 f->do_oop(&_long_mirror);
281 f->do_oop(&_short_mirror);
282 f->do_oop(&_void_mirror);
283 #endif
284
285 f->do_ptr((void**)&_the_array_interfaces_array);
286 f->do_ptr((void**)&_the_empty_int_array);
287 f->do_ptr((void**)&_the_empty_short_array);
288 f->do_ptr((void**)&_the_empty_method_array);
289 f->do_ptr((void**)&_the_empty_klass_array);
290 _finalizer_register_cache->serialize(f);
291 _loader_addClass_cache->serialize(f);
292 _pd_implies_cache->serialize(f);
293 _throw_illegal_access_error_cache->serialize(f);
294 _do_stack_walk_cache->serialize(f);
295 }
296
297 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
298 if (size < alignment || size % alignment != 0) {
299 vm_exit_during_initialization(
300 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
301 }
302 }
303
304 void initialize_basic_type_klass(Klass* k, TRAPS) {
305 Klass* ok = SystemDictionary::Object_klass();
306 #if INCLUDE_CDS
307 if (UseSharedSpaces) {
308 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
309 assert(k->super() == ok, "u3");
310 k->restore_unshareable_info(loader_data, Handle(), CHECK);
311 } else
312 #endif
313 {
314 k->initialize_supers(ok, NULL, CHECK);
315 }
316 k->append_to_sibling_list();
317 }
318
319 void Universe::genesis(TRAPS) {
320 ResourceMark rm;
321
322 { FlagSetting fs(_bootstrapping, true);
323
324 { MutexLocker mc(Compile_lock);
325
326 java_lang_Class::allocate_fixup_lists();
327
328 // determine base vtable size; without that we cannot create the array klasses
329 compute_base_vtable_size();
330
331 if (!UseSharedSpaces) {
332 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK);
333 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK);
334 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK);
335 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK);
336 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK);
337 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK);
338 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK);
339 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK);
340
341 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj;
342 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj;
343 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj;
344 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj;
345 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj;
346 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj;
347 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj;
348 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj;
349
350 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
351
352 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
353 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
354 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
355 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
356 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
357 }
358 }
359
360 vmSymbols::initialize(CHECK);
361
362 SystemDictionary::initialize(CHECK);
363
364 Klass* ok = SystemDictionary::Object_klass();
365
366 _the_null_string = StringTable::intern("null", CHECK);
367 _the_min_jint_string = StringTable::intern("-2147483648", CHECK);
368
369 #if INCLUDE_CDS
370 if (UseSharedSpaces) {
371 // Verify shared interfaces array.
372 assert(_the_array_interfaces_array->at(0) ==
373 SystemDictionary::Cloneable_klass(), "u3");
374 assert(_the_array_interfaces_array->at(1) ==
375 SystemDictionary::Serializable_klass(), "u3");
376 MetaspaceShared::fixup_mapped_heap_regions();
377 } else
378 #endif
379 {
380 // Set up shared interfaces array. (Do this before supers are set up.)
381 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
382 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
383 }
384
385 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
386 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
387 initialize_basic_type_klass(singleArrayKlassObj(), CHECK);
388 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
389 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
390 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
391 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
392 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
393 } // end of core bootstrapping
394
395 {
396 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
397 _the_null_sentinel = tns();
398 }
399
400 // Maybe this could be lifted up now that object array can be initialized
401 // during the bootstrapping.
402
403 // OLD
404 // Initialize _objectArrayKlass after core bootstraping to make
405 // sure the super class is set up properly for _objectArrayKlass.
406 // ---
407 // NEW
408 // Since some of the old system object arrays have been converted to
409 // ordinary object arrays, _objectArrayKlass will be loaded when
410 // SystemDictionary::initialize(CHECK); is run. See the extra check
411 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
412 _objectArrayKlassObj = InstanceKlass::
413 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
414 // OLD
415 // Add the class to the class hierarchy manually to make sure that
416 // its vtable is initialized after core bootstrapping is completed.
417 // ---
418 // New
419 // Have already been initialized.
420 _objectArrayKlassObj->append_to_sibling_list();
421
422 #ifdef ASSERT
423 if (FullGCALot) {
424 // Allocate an array of dummy objects.
425 // We'd like these to be at the bottom of the old generation,
426 // so that when we free one and then collect,
427 // (almost) the whole heap moves
428 // and we find out if we actually update all the oops correctly.
429 // But we can't allocate directly in the old generation,
430 // so we allocate wherever, and hope that the first collection
431 // moves these objects to the bottom of the old generation.
432 // We can allocate directly in the permanent generation, so we do.
433 int size;
434 if (UseConcMarkSweepGC) {
435 log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate");
436 size = FullGCALotDummies;
437 } else {
438 size = FullGCALotDummies * 2;
439 }
440 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
441 objArrayHandle dummy_array(THREAD, naked_array);
442 int i = 0;
443 while (i < size) {
444 // Allocate dummy in old generation
445 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK);
446 dummy_array->obj_at_put(i++, dummy);
447 }
448 {
449 // Only modify the global variable inside the mutex.
450 // If we had a race to here, the other dummy_array instances
451 // and their elements just get dropped on the floor, which is fine.
452 MutexLocker ml(FullGCALot_lock);
453 if (_fullgc_alot_dummy_array == NULL) {
454 _fullgc_alot_dummy_array = dummy_array();
455 }
456 }
457 assert(i == _fullgc_alot_dummy_array->length(), "just checking");
458 }
459 #endif
460 }
461
462 void Universe::initialize_basic_type_mirrors(TRAPS) {
463 #if INCLUDE_CDS_JAVA_HEAP
464 if (UseSharedSpaces &&
465 MetaspaceShared::open_archive_heap_region_mapped() &&
466 _int_mirror != NULL) {
467 assert(MetaspaceShared::is_heap_object_archiving_allowed(), "Sanity");
468 assert(_float_mirror != NULL && _double_mirror != NULL &&
469 _byte_mirror != NULL && _byte_mirror != NULL &&
470 _bool_mirror != NULL && _char_mirror != NULL &&
471 _long_mirror != NULL && _short_mirror != NULL &&
472 _void_mirror != NULL, "Sanity");
473 } else
474 #endif
475 {
476 _int_mirror =
477 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK);
478 _float_mirror =
479 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK);
480 _double_mirror =
481 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK);
482 _byte_mirror =
483 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK);
484 _bool_mirror =
485 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
486 _char_mirror =
487 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK);
488 _long_mirror =
489 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK);
490 _short_mirror =
491 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK);
492 _void_mirror =
493 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK);
494 }
495
496 _mirrors[T_INT] = _int_mirror;
497 _mirrors[T_FLOAT] = _float_mirror;
498 _mirrors[T_DOUBLE] = _double_mirror;
499 _mirrors[T_BYTE] = _byte_mirror;
500 _mirrors[T_BOOLEAN] = _bool_mirror;
501 _mirrors[T_CHAR] = _char_mirror;
502 _mirrors[T_LONG] = _long_mirror;
503 _mirrors[T_SHORT] = _short_mirror;
504 _mirrors[T_VOID] = _void_mirror;
505 //_mirrors[T_OBJECT] = _object_klass->java_mirror();
506 //_mirrors[T_ARRAY] = _object_klass->java_mirror();
507 }
508
509 void Universe::fixup_mirrors(TRAPS) {
510 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
511 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
512 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
513 // that the number of objects allocated at this point is very small.
514 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
515 HandleMark hm(THREAD);
516 // Cache the start of the static fields
517 InstanceMirrorKlass::init_offset_of_static_fields();
518
519 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
520 int list_length = list->length();
521 for (int i = 0; i < list_length; i++) {
522 Klass* k = list->at(i);
523 assert(k->is_klass(), "List should only hold classes");
524 EXCEPTION_MARK;
525 java_lang_Class::fixup_mirror(k, CATCH);
526 }
527 delete java_lang_Class::fixup_mirror_list();
528 java_lang_Class::set_fixup_mirror_list(NULL);
529 }
530
531 #define assert_pll_locked(test) \
532 assert(Heap_lock->test(), "Reference pending list access requires lock")
533
534 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
535
536 oop Universe::reference_pending_list() {
537 if (Thread::current()->is_VM_thread()) {
538 assert_pll_locked(is_locked);
539 } else {
540 assert_pll_ownership();
541 }
542 return _reference_pending_list;
543 }
544
545 void Universe::set_reference_pending_list(oop list) {
546 assert_pll_ownership();
547 _reference_pending_list = list;
548 }
549
550 bool Universe::has_reference_pending_list() {
551 assert_pll_ownership();
552 return _reference_pending_list != NULL;
553 }
554
555 oop Universe::swap_reference_pending_list(oop list) {
556 assert_pll_locked(is_locked);
557 return Atomic::xchg(list, &_reference_pending_list);
558 }
559
560 #undef assert_pll_locked
561 #undef assert_pll_ownership
562
563 // initialize_vtable could cause gc if
564 // 1) we specified true to initialize_vtable and
565 // 2) this ran after gc was enabled
566 // In case those ever change we use handles for oops
567 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) {
568 // init vtable of k and all subclasses
569 ko->vtable().initialize_vtable(false, CHECK);
570 if (ko->is_instance_klass()) {
571 for (Klass* sk = ko->subklass();
572 sk != NULL;
573 sk = sk->next_sibling()) {
574 reinitialize_vtable_of(sk, CHECK);
575 }
576 }
577 }
578
579
580 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) {
581 k->itable().initialize_itable(false, CHECK);
582 }
583
584
585 void Universe::reinitialize_itables(TRAPS) {
586 ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK);
587 }
588
589
590 bool Universe::on_page_boundary(void* addr) {
591 return is_aligned(addr, os::vm_page_size());
592 }
593
594
595 bool Universe::should_fill_in_stack_trace(Handle throwable) {
596 // never attempt to fill in the stack trace of preallocated errors that do not have
597 // backtrace. These errors are kept alive forever and may be "re-used" when all
598 // preallocated errors with backtrace have been consumed. Also need to avoid
599 // a potential loop which could happen if an out of memory occurs when attempting
600 // to allocate the backtrace.
601 return ((!oopDesc::equals(throwable(), Universe::_out_of_memory_error_java_heap)) &&
602 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_metaspace)) &&
603 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_class_metaspace)) &&
604 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_array_size)) &&
605 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_gc_overhead_limit)) &&
606 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_realloc_objects)));
607 }
608
609
610 oop Universe::gen_out_of_memory_error(oop default_err) {
611 // generate an out of memory error:
612 // - if there is a preallocated error and stack traces are available
613 // (j.l.Throwable is initialized), then return the preallocated
614 // error with a filled in stack trace, and with the message
615 // provided by the default error.
616 // - otherwise, return the default error, without a stack trace.
617 int next;
618 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
619 SystemDictionary::Throwable_klass()->is_initialized()) {
620 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);
621 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
622 } else {
623 next = -1;
624 }
625 if (next < 0) {
626 // all preallocated errors have been used.
627 // return default
628 return default_err;
629 } else {
630 Thread* THREAD = Thread::current();
631 Handle default_err_h(THREAD, default_err);
632 // get the error object at the slot and set set it to NULL so that the
633 // array isn't keeping it alive anymore.
634 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next));
635 assert(exc() != NULL, "slot has been used already");
636 preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
637
638 // use the message from the default error
639 oop msg = java_lang_Throwable::message(default_err_h());
640 assert(msg != NULL, "no message");
641 java_lang_Throwable::set_message(exc(), msg);
642
643 // populate the stack trace and return it.
644 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
645 return exc();
646 }
647 }
648
649 intptr_t Universe::_non_oop_bits = 0;
650
651 void* Universe::non_oop_word() {
652 // Neither the high bits nor the low bits of this value is allowed
653 // to look like (respectively) the high or low bits of a real oop.
654 //
655 // High and low are CPU-specific notions, but low always includes
656 // the low-order bit. Since oops are always aligned at least mod 4,
657 // setting the low-order bit will ensure that the low half of the
658 // word will never look like that of a real oop.
659 //
660 // Using the OS-supplied non-memory-address word (usually 0 or -1)
661 // will take care of the high bits, however many there are.
662
663 if (_non_oop_bits == 0) {
664 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
665 }
666
667 return (void*)_non_oop_bits;
668 }
669
670 jint universe_init() {
671 assert(!Universe::_fully_initialized, "called after initialize_vtables");
672 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
673 "LogHeapWordSize is incorrect.");
674 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
675 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
676 "oop size is not not a multiple of HeapWord size");
677
678 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
679
680 JavaClasses::compute_hard_coded_offsets();
681
682 jint status = Universe::initialize_heap();
683 if (status != JNI_OK) {
684 return status;
685 }
686
687 SystemDictionary::initialize_oop_storage();
688
689 Metaspace::global_initialize();
690
691 // Initialize performance counters for metaspaces
692 MetaspaceCounters::initialize_performance_counters();
693 CompressedClassSpaceCounters::initialize_performance_counters();
694
695 AOTLoader::universe_init();
696
697 // Checks 'AfterMemoryInit' constraints.
698 if (!JVMFlagConstraintList::check_constraints(JVMFlagConstraint::AfterMemoryInit)) {
699 return JNI_EINVAL;
700 }
701
702 // Create memory for metadata. Must be after initializing heap for
703 // DumpSharedSpaces.
704 ClassLoaderData::init_null_class_loader_data();
705
706 // We have a heap so create the Method* caches before
707 // Metaspace::initialize_shared_spaces() tries to populate them.
708 Universe::_finalizer_register_cache = new LatestMethodCache();
709 Universe::_loader_addClass_cache = new LatestMethodCache();
710 Universe::_pd_implies_cache = new LatestMethodCache();
711 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
712 Universe::_do_stack_walk_cache = new LatestMethodCache();
713
714 #if INCLUDE_CDS
715 if (UseSharedSpaces) {
716 // Read the data structures supporting the shared spaces (shared
717 // system dictionary, symbol table, etc.). After that, access to
718 // the file (other than the mapped regions) is no longer needed, and
719 // the file is closed. Closing the file does not affect the
720 // currently mapped regions.
721 MetaspaceShared::initialize_shared_spaces();
722 StringTable::create_table();
723 } else
724 #endif
725 {
726 SymbolTable::create_table();
727 StringTable::create_table();
728
729 #if INCLUDE_CDS
730 if (DumpSharedSpaces) {
731 MetaspaceShared::prepare_for_dumping();
732 }
733 #endif
734 }
735 if (strlen(VerifySubSet) > 0) {
736 Universe::initialize_verify_flags();
737 }
738
739 ResolvedMethodTable::create_table();
740
741 return JNI_OK;
742 }
743
744 CollectedHeap* Universe::create_heap() {
745 assert(_collectedHeap == NULL, "Heap already created");
746 return GCConfig::arguments()->create_heap();
747 }
748
749 // Choose the heap base address and oop encoding mode
750 // when compressed oops are used:
751 // Unscaled - Use 32-bits oops without encoding when
752 // NarrowOopHeapBaseMin + heap_size < 4Gb
753 // ZeroBased - Use zero based compressed oops with encoding when
754 // NarrowOopHeapBaseMin + heap_size < 32Gb
755 // HeapBased - Use compressed oops with heap base + encoding.
756
757 jint Universe::initialize_heap() {
758 _collectedHeap = create_heap();
759 jint status = _collectedHeap->initialize();
760 if (status != JNI_OK) {
761 return status;
762 }
763 log_info(gc)("Using %s", _collectedHeap->name());
764
765 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
766
767 #ifdef _LP64
768 if (UseCompressedOops) {
769 // Subtract a page because something can get allocated at heap base.
770 // This also makes implicit null checking work, because the
771 // memory+1 page below heap_base needs to cause a signal.
772 // See needs_explicit_null_check.
773 // Only set the heap base for compressed oops because it indicates
774 // compressed oops for pstack code.
775 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) {
776 // Didn't reserve heap below 4Gb. Must shift.
777 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
778 }
779 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) {
780 // Did reserve heap below 32Gb. Can use base == 0;
781 Universe::set_narrow_oop_base(0);
782 }
783 AOTLoader::set_narrow_oop_shift();
784
785 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base());
786
787 LogTarget(Info, gc, heap, coops) lt;
788 if (lt.is_enabled()) {
789 ResourceMark rm;
790 LogStream ls(lt);
791 Universe::print_compressed_oops_mode(&ls);
792 }
793
794 // Tell tests in which mode we run.
795 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode",
796 narrow_oop_mode_to_string(narrow_oop_mode()),
797 false));
798 }
799 // Universe::narrow_oop_base() is one page below the heap.
800 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() -
801 os::vm_page_size()) ||
802 Universe::narrow_oop_base() == NULL, "invalid value");
803 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes ||
804 Universe::narrow_oop_shift() == 0, "invalid value");
805 #endif
806
807 // We will never reach the CATCH below since Exceptions::_throw will cause
808 // the VM to exit if an exception is thrown during initialization
809
810 if (UseTLAB) {
811 assert(Universe::heap()->supports_tlab_allocation(),
812 "Should support thread-local allocation buffers");
813 ThreadLocalAllocBuffer::startup_initialization();
814 }
815 return JNI_OK;
816 }
817
818 void Universe::print_compressed_oops_mode(outputStream* st) {
819 st->print("Heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
820 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M);
821
822 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode()));
823
824 if (Universe::narrow_oop_base() != 0) {
825 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base()));
826 }
827
828 if (Universe::narrow_oop_shift() != 0) {
829 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
830 }
831
832 if (!Universe::narrow_oop_use_implicit_null_checks()) {
833 st->print(", no protected page in front of the heap");
834 }
835 st->cr();
836 }
837
838 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
839
840 assert(alignment <= Arguments::conservative_max_heap_alignment(),
841 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
842 alignment, Arguments::conservative_max_heap_alignment());
843
844 size_t total_reserved = align_up(heap_size, alignment);
845 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
846 "heap size is too big for compressed oops");
847
848 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size());
849 assert(!UseLargePages
850 || UseParallelGC
851 || use_large_pages, "Wrong alignment to use large pages");
852
853 // Now create the space.
854 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt);
855
856 if (total_rs.is_reserved()) {
857 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
858 "must be exactly of required size and alignment");
859 // We are good.
860
861 if (UseCompressedOops) {
862 // Universe::initialize_heap() will reset this to NULL if unscaled
863 // or zero-based narrow oops are actually used.
864 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
865 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
866 }
867
868 if (AllocateHeapAt != NULL) {
869 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
870 }
871 return total_rs;
872 }
873
874 vm_exit_during_initialization(
875 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
876 total_reserved/K));
877
878 // satisfy compiler
879 ShouldNotReachHere();
880 return ReservedHeapSpace(0, 0, false);
881 }
882
883
884 // It's the caller's responsibility to ensure glitch-freedom
885 // (if required).
886 void Universe::update_heap_info_at_gc() {
887 _heap_capacity_at_last_gc = heap()->capacity();
888 _heap_used_at_last_gc = heap()->used();
889 }
890
891
892 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) {
893 switch (mode) {
894 case UnscaledNarrowOop:
895 return "32-bit";
896 case ZeroBasedNarrowOop:
897 return "Zero based";
898 case DisjointBaseNarrowOop:
899 return "Non-zero disjoint base";
900 case HeapBasedNarrowOop:
901 return "Non-zero based";
902 default:
903 ShouldNotReachHere();
904 return "";
905 }
906 }
907
908
909 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() {
910 if (narrow_oop_base_disjoint()) {
911 return DisjointBaseNarrowOop;
912 }
913
914 if (narrow_oop_base() != 0) {
915 return HeapBasedNarrowOop;
916 }
917
918 if (narrow_oop_shift() != 0) {
919 return ZeroBasedNarrowOop;
920 }
921
922 return UnscaledNarrowOop;
923 }
924
925 void initialize_known_method(LatestMethodCache* method_cache,
926 InstanceKlass* ik,
927 const char* method,
928 Symbol* signature,
929 bool is_static, TRAPS)
930 {
931 TempNewSymbol name = SymbolTable::new_symbol(method, CHECK);
932 Method* m = NULL;
933 // The klass must be linked before looking up the method.
934 if (!ik->link_class_or_fail(THREAD) ||
935 ((m = ik->find_method(name, signature)) == NULL) ||
936 is_static != m->is_static()) {
937 ResourceMark rm(THREAD);
938 // NoSuchMethodException doesn't actually work because it tries to run the
939 // <init> function before java_lang_Class is linked. Print error and exit.
940 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
941 ik->name()->as_C_string(), method));
942 }
943 method_cache->init(ik, m);
944 }
945
946 void Universe::initialize_known_methods(TRAPS) {
947 // Set up static method for registering finalizers
948 initialize_known_method(_finalizer_register_cache,
949 SystemDictionary::Finalizer_klass(),
950 "register",
951 vmSymbols::object_void_signature(), true, CHECK);
952
953 initialize_known_method(_throw_illegal_access_error_cache,
954 SystemDictionary::internal_Unsafe_klass(),
955 "throwIllegalAccessError",
956 vmSymbols::void_method_signature(), true, CHECK);
957
958 // Set up method for registering loaded classes in class loader vector
959 initialize_known_method(_loader_addClass_cache,
960 SystemDictionary::ClassLoader_klass(),
961 "addClass",
962 vmSymbols::class_void_signature(), false, CHECK);
963
964 // Set up method for checking protection domain
965 initialize_known_method(_pd_implies_cache,
966 SystemDictionary::ProtectionDomain_klass(),
967 "impliesCreateAccessControlContext",
968 vmSymbols::void_boolean_signature(), false, CHECK);
969
970 // Set up method for stack walking
971 initialize_known_method(_do_stack_walk_cache,
972 SystemDictionary::AbstractStackWalker_klass(),
973 "doStackWalk",
974 vmSymbols::doStackWalk_signature(), false, CHECK);
975 }
976
977 void universe2_init() {
978 EXCEPTION_MARK;
979 Universe::genesis(CATCH);
980 }
981
982 // Set after initialization of the module runtime, call_initModuleRuntime
983 void universe_post_module_init() {
984 Universe::_module_initialized = true;
985 }
986
987 bool universe_post_init() {
988 assert(!is_init_completed(), "Error: initialization not yet completed!");
989 Universe::_fully_initialized = true;
990 EXCEPTION_MARK;
991 { ResourceMark rm;
992 Interpreter::initialize(); // needed for interpreter entry points
993 if (!UseSharedSpaces) {
994 HandleMark hm(THREAD);
995 Klass* ok = SystemDictionary::Object_klass();
996 Universe::reinitialize_vtable_of(ok, CHECK_false);
997 Universe::reinitialize_itables(CHECK_false);
998 }
999 }
1000
1001 HandleMark hm(THREAD);
1002 // Setup preallocated empty java.lang.Class array
1003 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
1004
1005 // Setup preallocated OutOfMemoryError errors
1006 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
1007 InstanceKlass* ik = InstanceKlass::cast(k);
1008 Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false);
1009 Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false);
1010 Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false);
1011 Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false);
1012 Universe::_out_of_memory_error_gc_overhead_limit =
1013 ik->allocate_instance(CHECK_false);
1014 Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false);
1015
1016 // Setup preallocated cause message for delayed StackOverflowError
1017 if (StackReservedPages > 0) {
1018 Universe::_delayed_stack_overflow_error_message =
1019 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
1020 }
1021
1022 // Setup preallocated NullPointerException
1023 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1024 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
1025 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1026 // Setup preallocated ArithmeticException
1027 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1028 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
1029 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1030 // Virtual Machine Error for when we get into a situation we can't resolve
1031 k = SystemDictionary::resolve_or_fail(
1032 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
1033 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1034 if (!linked) {
1035 tty->print_cr("Unable to link/verify VirtualMachineError class");
1036 return false; // initialization failed
1037 }
1038 Universe::_virtual_machine_error_instance =
1039 InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1040
1041 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1042
1043 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
1044 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
1045
1046 msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
1047 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
1048 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
1049 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
1050
1051 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
1052 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
1053
1054 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
1055 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
1056
1057 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false);
1058 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg());
1059
1060 msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1061 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
1062
1063 // Setup the array of errors that have preallocated backtrace
1064 k = Universe::_out_of_memory_error_java_heap->klass();
1065 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
1066 ik = InstanceKlass::cast(k);
1067
1068 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
1069 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false);
1070 for (int i=0; i<len; i++) {
1071 oop err = ik->allocate_instance(CHECK_false);
1072 Handle err_h = Handle(THREAD, err);
1073 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
1074 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
1075 }
1076 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
1077
1078 Universe::initialize_known_methods(CHECK_false);
1079
1080 // This needs to be done before the first scavenge/gc, since
1081 // it's an input to soft ref clearing policy.
1082 {
1083 MutexLocker x(Heap_lock);
1084 Universe::update_heap_info_at_gc();
1085 }
1086
1087 // ("weak") refs processing infrastructure initialization
1088 Universe::heap()->post_initialize();
1089
1090 MemoryService::add_metaspace_memory_pools();
1091
1092 MemoryService::set_universe_heap(Universe::heap());
1093 #if INCLUDE_CDS
1094 MetaspaceShared::post_initialize(CHECK_false);
1095 #endif
1096 return true;
1097 }
1098
1099
1100 void Universe::compute_base_vtable_size() {
1101 _base_vtable_size = ClassLoader::compute_Object_vtable();
1102 }
1103
1104 void Universe::print_on(outputStream* st) {
1105 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1106 st->print_cr("Heap");
1107 heap()->print_on(st);
1108 }
1109
1110 void Universe::print_heap_at_SIGBREAK() {
1111 if (PrintHeapAtSIGBREAK) {
1112 print_on(tty);
1113 tty->cr();
1114 tty->flush();
1115 }
1116 }
1117
1118 void Universe::print_heap_before_gc() {
1119 LogTarget(Debug, gc, heap) lt;
1120 if (lt.is_enabled()) {
1121 LogStream ls(lt);
1122 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1123 ResourceMark rm;
1124 heap()->print_on(&ls);
1125 }
1126 }
1127
1128 void Universe::print_heap_after_gc() {
1129 LogTarget(Debug, gc, heap) lt;
1130 if (lt.is_enabled()) {
1131 LogStream ls(lt);
1132 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1133 ResourceMark rm;
1134 heap()->print_on(&ls);
1135 }
1136 }
1137
1138 void Universe::initialize_verify_flags() {
1139 verify_flags = 0;
1140 const char delimiter[] = " ,";
1141
1142 size_t length = strlen(VerifySubSet);
1143 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1144 strncpy(subset_list, VerifySubSet, length + 1);
1145
1146 char* token = strtok(subset_list, delimiter);
1147 while (token != NULL) {
1148 if (strcmp(token, "threads") == 0) {
1149 verify_flags |= Verify_Threads;
1150 } else if (strcmp(token, "heap") == 0) {
1151 verify_flags |= Verify_Heap;
1152 } else if (strcmp(token, "symbol_table") == 0) {
1153 verify_flags |= Verify_SymbolTable;
1154 } else if (strcmp(token, "string_table") == 0) {
1155 verify_flags |= Verify_StringTable;
1156 } else if (strcmp(token, "codecache") == 0) {
1157 verify_flags |= Verify_CodeCache;
1158 } else if (strcmp(token, "dictionary") == 0) {
1159 verify_flags |= Verify_SystemDictionary;
1160 } else if (strcmp(token, "classloader_data_graph") == 0) {
1161 verify_flags |= Verify_ClassLoaderDataGraph;
1162 } else if (strcmp(token, "metaspace") == 0) {
1163 verify_flags |= Verify_MetaspaceUtils;
1164 } else if (strcmp(token, "jni_handles") == 0) {
1165 verify_flags |= Verify_JNIHandles;
1166 } else if (strcmp(token, "codecache_oops") == 0) {
1167 verify_flags |= Verify_CodeCacheOops;
1168 } else {
1169 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1170 }
1171 token = strtok(NULL, delimiter);
1172 }
1173 FREE_C_HEAP_ARRAY(char, subset_list);
1174 }
1175
1176 bool Universe::should_verify_subset(uint subset) {
1177 if (verify_flags & subset) {
1178 return true;
1179 }
1180 return false;
1181 }
1182
1183 void Universe::verify(VerifyOption option, const char* prefix) {
1184 // The use of _verify_in_progress is a temporary work around for
1185 // 6320749. Don't bother with a creating a class to set and clear
1186 // it since it is only used in this method and the control flow is
1187 // straight forward.
1188 _verify_in_progress = true;
1189
1190 COMPILER2_PRESENT(
1191 assert(!DerivedPointerTable::is_active(),
1192 "DPT should not be active during verification "
1193 "(of thread stacks below)");
1194 )
1195
1196 ResourceMark rm;
1197 HandleMark hm; // Handles created during verification can be zapped
1198 _verify_count++;
1199
1200 FormatBuffer<> title("Verifying %s", prefix);
1201 GCTraceTime(Info, gc, verify) tm(title.buffer());
1202 if (should_verify_subset(Verify_Threads)) {
1203 log_debug(gc, verify)("Threads");
1204 Threads::verify();
1205 }
1206 if (should_verify_subset(Verify_Heap)) {
1207 log_debug(gc, verify)("Heap");
1208 heap()->verify(option);
1209 }
1210 if (should_verify_subset(Verify_SymbolTable)) {
1211 log_debug(gc, verify)("SymbolTable");
1212 SymbolTable::verify();
1213 }
1214 if (should_verify_subset(Verify_StringTable)) {
1215 log_debug(gc, verify)("StringTable");
1216 StringTable::verify();
1217 }
1218 if (should_verify_subset(Verify_CodeCache)) {
1219 {
1220 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1221 log_debug(gc, verify)("CodeCache");
1222 CodeCache::verify();
1223 }
1224 }
1225 if (should_verify_subset(Verify_SystemDictionary)) {
1226 log_debug(gc, verify)("SystemDictionary");
1227 SystemDictionary::verify();
1228 }
1229 #ifndef PRODUCT
1230 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1231 log_debug(gc, verify)("ClassLoaderDataGraph");
1232 ClassLoaderDataGraph::verify();
1233 }
1234 #endif
1235 if (should_verify_subset(Verify_MetaspaceUtils)) {
1236 log_debug(gc, verify)("MetaspaceUtils");
1237 MetaspaceUtils::verify_free_chunks();
1238 }
1239 if (should_verify_subset(Verify_JNIHandles)) {
1240 log_debug(gc, verify)("JNIHandles");
1241 JNIHandles::verify();
1242 }
1243 if (should_verify_subset(Verify_CodeCacheOops)) {
1244 log_debug(gc, verify)("CodeCache Oops");
1245 CodeCache::verify_oops();
1246 }
1247
1248 _verify_in_progress = false;
1249 }
1250
1251
1252 #ifndef PRODUCT
1253 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1254 assert(low_boundary < high_boundary, "bad interval");
1255
1256 // decide which low-order bits we require to be clear:
1257 size_t alignSize = MinObjAlignmentInBytes;
1258 size_t min_object_size = CollectedHeap::min_fill_size();
1259
1260 // make an inclusive limit:
1261 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1262 uintptr_t min = (uintptr_t)low_boundary;
1263 assert(min < max, "bad interval");
1264 uintptr_t diff = max ^ min;
1265
1266 // throw away enough low-order bits to make the diff vanish
1267 uintptr_t mask = (uintptr_t)(-1);
1268 while ((mask & diff) != 0)
1269 mask <<= 1;
1270 uintptr_t bits = (min & mask);
1271 assert(bits == (max & mask), "correct mask");
1272 // check an intermediate value between min and max, just to make sure:
1273 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1274
1275 // require address alignment, too:
1276 mask |= (alignSize - 1);
1277
1278 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1279 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1280 }
1281 _verify_oop_mask = mask;
1282 _verify_oop_bits = bits;
1283 }
1284
1285 // Oop verification (see MacroAssembler::verify_oop)
1286
1287 uintptr_t Universe::verify_oop_mask() {
1288 MemRegion m = heap()->reserved_region();
1289 calculate_verify_data(m.start(), m.end());
1290 return _verify_oop_mask;
1291 }
1292
1293 uintptr_t Universe::verify_oop_bits() {
1294 MemRegion m = heap()->reserved_region();
1295 calculate_verify_data(m.start(), m.end());
1296 return _verify_oop_bits;
1297 }
1298
1299 uintptr_t Universe::verify_mark_mask() {
1300 return markOopDesc::lock_mask_in_place;
1301 }
1302
1303 uintptr_t Universe::verify_mark_bits() {
1304 intptr_t mask = verify_mark_mask();
1305 intptr_t bits = (intptr_t)markOopDesc::prototype();
1306 assert((bits & ~mask) == 0, "no stray header bits");
1307 return bits;
1308 }
1309 #endif // PRODUCT
1310
1311
1312 void Universe::compute_verify_oop_data() {
1313 verify_oop_mask();
1314 verify_oop_bits();
1315 verify_mark_mask();
1316 verify_mark_bits();
1317 }
1318
1319
1320 void LatestMethodCache::init(Klass* k, Method* m) {
1321 if (!UseSharedSpaces) {
1322 _klass = k;
1323 }
1324 #ifndef PRODUCT
1325 else {
1326 // sharing initilization should have already set up _klass
1327 assert(_klass != NULL, "just checking");
1328 }
1329 #endif
1330
1331 _method_idnum = m->method_idnum();
1332 assert(_method_idnum >= 0, "sanity check");
1333 }
1334
1335
1336 Method* LatestMethodCache::get_method() {
1337 if (klass() == NULL) return NULL;
1338 InstanceKlass* ik = InstanceKlass::cast(klass());
1339 Method* m = ik->method_with_idnum(method_idnum());
1340 assert(m != NULL, "sanity check");
1341 return m;
1342 }
1343
1344
1345 #ifdef ASSERT
1346 // Release dummy object(s) at bottom of heap
1347 bool Universe::release_fullgc_alot_dummy() {
1348 MutexLocker ml(FullGCALot_lock);
1349 if (_fullgc_alot_dummy_array != NULL) {
1350 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
1351 // No more dummies to release, release entire array instead
1352 _fullgc_alot_dummy_array = NULL;
1353 return false;
1354 }
1355 if (!UseConcMarkSweepGC) {
1356 // Release dummy at bottom of old generation
1357 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1358 }
1359 // Release dummy at bottom of permanent generation
1360 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1361 }
1362 return true;
1363 }
1364
1365 #endif // ASSERT