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