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