1 /*
2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "aot/aotLoader.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/classLoaderData.hpp"
29 #include "classfile/javaClasses.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/vmSymbols.hpp"
33 #include "code/codeCache.hpp"
34 #include "code/dependencies.hpp"
35 #include "gc/shared/cardTableModRefBS.hpp"
36 #include "gc/shared/collectedHeap.inline.hpp"
37 #include "gc/shared/gcArguments.hpp"
38 #include "gc/shared/gcLocker.inline.hpp"
39 #include "gc/shared/generation.hpp"
40 #include "gc/shared/gcTraceTime.inline.hpp"
41 #include "gc/shared/space.hpp"
42 #include "interpreter/interpreter.hpp"
43 #include "logging/log.hpp"
44 #include "logging/logStream.hpp"
45 #include "memory/filemap.hpp"
46 #include "memory/metadataFactory.hpp"
47 #include "memory/metaspaceClosure.hpp"
48 #include "memory/metaspaceShared.hpp"
49 #include "memory/oopFactory.hpp"
50 #include "memory/resourceArea.hpp"
51 #include "memory/universe.hpp"
52 #include "memory/universe.inline.hpp"
53 #include "oops/constantPool.hpp"
54 #include "oops/instanceClassLoaderKlass.hpp"
55 #include "oops/instanceKlass.hpp"
56 #include "oops/instanceMirrorKlass.hpp"
57 #include "oops/instanceRefKlass.hpp"
58 #include "oops/objArrayOop.inline.hpp"
59 #include "oops/oop.inline.hpp"
60 #include "oops/typeArrayKlass.hpp"
61 #include "prims/resolvedMethodTable.hpp"
62 #include "runtime/arguments.hpp"
63 #include "runtime/atomic.hpp"
64 #include "runtime/commandLineFlagConstraintList.hpp"
65 #include "runtime/deoptimization.hpp"
66 #include "runtime/handles.inline.hpp"
67 #include "runtime/init.hpp"
68 #include "runtime/java.hpp"
69 #include "runtime/javaCalls.hpp"
70 #include "runtime/sharedRuntime.hpp"
71 #include "runtime/synchronizer.hpp"
72 #include "runtime/thread.inline.hpp"
73 #include "runtime/timerTrace.hpp"
74 #include "runtime/vm_operations.hpp"
75 #include "services/memoryService.hpp"
76 #include "utilities/align.hpp"
77 #include "utilities/copy.hpp"
78 #include "utilities/debug.hpp"
79 #include "utilities/events.hpp"
80 #include "utilities/formatBuffer.hpp"
81 #include "utilities/hashtable.inline.hpp"
82 #include "utilities/macros.hpp"
83 #include "utilities/ostream.hpp"
84 #include "utilities/preserveException.hpp"
85 #if INCLUDE_CDS
86 #include "classfile/sharedClassUtil.hpp"
87 #endif
88
89 // Known objects
90 Klass* Universe::_boolArrayKlassObj = NULL;
91 Klass* Universe::_byteArrayKlassObj = NULL;
92 Klass* Universe::_charArrayKlassObj = NULL;
93 Klass* Universe::_intArrayKlassObj = NULL;
94 Klass* Universe::_shortArrayKlassObj = NULL;
95 Klass* Universe::_longArrayKlassObj = NULL;
96 Klass* Universe::_singleArrayKlassObj = NULL;
97 Klass* Universe::_doubleArrayKlassObj = NULL;
98 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ };
99 Klass* Universe::_objectArrayKlassObj = NULL;
100 oop Universe::_int_mirror = NULL;
101 oop Universe::_float_mirror = NULL;
102 oop Universe::_double_mirror = NULL;
103 oop Universe::_byte_mirror = NULL;
104 oop Universe::_bool_mirror = NULL;
105 oop Universe::_char_mirror = NULL;
106 oop Universe::_long_mirror = NULL;
107 oop Universe::_short_mirror = NULL;
108 oop Universe::_void_mirror = NULL;
109 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ };
110 oop Universe::_main_thread_group = NULL;
111 oop Universe::_system_thread_group = NULL;
112 objArrayOop Universe::_the_empty_class_klass_array = NULL;
113 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
114 oop Universe::_the_null_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::_allocation_context_notification_obj = NULL;
137 oop Universe::_reference_pending_list = NULL;
138
139 Array<int>* Universe::_the_empty_int_array = NULL;
140 Array<u2>* Universe::_the_empty_short_array = NULL;
141 Array<Klass*>* Universe::_the_empty_klass_array = NULL;
142 Array<Method*>* Universe::_the_empty_method_array = NULL;
143
144 // These variables are guarded by FullGCALot_lock.
145 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;)
146 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
147
148 // Heap
149 int Universe::_verify_count = 0;
150
151 // Oop verification (see MacroAssembler::verify_oop)
152 uintptr_t Universe::_verify_oop_mask = 0;
153 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
154
155 int Universe::_base_vtable_size = 0;
156 bool Universe::_bootstrapping = false;
157 bool Universe::_module_initialized = false;
158 bool Universe::_fully_initialized = false;
159
160 size_t Universe::_heap_capacity_at_last_gc;
161 size_t Universe::_heap_used_at_last_gc = 0;
162
163 CollectedHeap* Universe::_collectedHeap = NULL;
164
165 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true };
166 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true };
167 address Universe::_narrow_ptrs_base;
168
169 void Universe::basic_type_classes_do(void f(Klass*)) {
170 f(boolArrayKlassObj());
171 f(byteArrayKlassObj());
172 f(charArrayKlassObj());
173 f(intArrayKlassObj());
174 f(shortArrayKlassObj());
175 f(longArrayKlassObj());
176 f(singleArrayKlassObj());
177 f(doubleArrayKlassObj());
178 }
179
180 void Universe::oops_do(OopClosure* f, bool do_all) {
181
182 f->do_oop((oop*) &_int_mirror);
183 f->do_oop((oop*) &_float_mirror);
184 f->do_oop((oop*) &_double_mirror);
185 f->do_oop((oop*) &_byte_mirror);
186 f->do_oop((oop*) &_bool_mirror);
187 f->do_oop((oop*) &_char_mirror);
188 f->do_oop((oop*) &_long_mirror);
189 f->do_oop((oop*) &_short_mirror);
190 f->do_oop((oop*) &_void_mirror);
191
192 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
193 f->do_oop((oop*) &_mirrors[i]);
194 }
195 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
196
197 f->do_oop((oop*)&_the_empty_class_klass_array);
198 f->do_oop((oop*)&_the_null_string);
199 f->do_oop((oop*)&_the_min_jint_string);
200 f->do_oop((oop*)&_out_of_memory_error_java_heap);
201 f->do_oop((oop*)&_out_of_memory_error_metaspace);
202 f->do_oop((oop*)&_out_of_memory_error_class_metaspace);
203 f->do_oop((oop*)&_out_of_memory_error_array_size);
204 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit);
205 f->do_oop((oop*)&_out_of_memory_error_realloc_objects);
206 f->do_oop((oop*)&_delayed_stack_overflow_error_message);
207 f->do_oop((oop*)&_preallocated_out_of_memory_error_array);
208 f->do_oop((oop*)&_null_ptr_exception_instance);
209 f->do_oop((oop*)&_arithmetic_exception_instance);
210 f->do_oop((oop*)&_virtual_machine_error_instance);
211 f->do_oop((oop*)&_main_thread_group);
212 f->do_oop((oop*)&_system_thread_group);
213 f->do_oop((oop*)&_vm_exception);
214 f->do_oop((oop*)&_allocation_context_notification_obj);
215 f->do_oop((oop*)&_reference_pending_list);
216 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);)
217 }
218
219 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
220 it->push(&_klass);
221 }
222
223 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
224 it->push(&_boolArrayKlassObj);
225 it->push(&_byteArrayKlassObj);
226 it->push(&_charArrayKlassObj);
227 it->push(&_intArrayKlassObj);
228 it->push(&_shortArrayKlassObj);
229 it->push(&_longArrayKlassObj);
230 it->push(&_singleArrayKlassObj);
231 it->push(&_doubleArrayKlassObj);
232 for (int i = 0; i < T_VOID+1; i++) {
233 it->push(&_typeArrayKlassObjs[i]);
234 }
235 it->push(&_objectArrayKlassObj);
236
237 it->push(&_the_empty_int_array);
238 it->push(&_the_empty_short_array);
239 it->push(&_the_empty_klass_array);
240 it->push(&_the_empty_method_array);
241 it->push(&_the_array_interfaces_array);
242
243 _finalizer_register_cache->metaspace_pointers_do(it);
244 _loader_addClass_cache->metaspace_pointers_do(it);
245 _pd_implies_cache->metaspace_pointers_do(it);
246 _throw_illegal_access_error_cache->metaspace_pointers_do(it);
247 _do_stack_walk_cache->metaspace_pointers_do(it);
248 }
249
250 // Serialize metadata in and out of CDS archive, not oops.
251 void Universe::serialize(SerializeClosure* f, bool do_all) {
252
253 f->do_ptr((void**)&_boolArrayKlassObj);
254 f->do_ptr((void**)&_byteArrayKlassObj);
255 f->do_ptr((void**)&_charArrayKlassObj);
256 f->do_ptr((void**)&_intArrayKlassObj);
257 f->do_ptr((void**)&_shortArrayKlassObj);
258 f->do_ptr((void**)&_longArrayKlassObj);
259 f->do_ptr((void**)&_singleArrayKlassObj);
260 f->do_ptr((void**)&_doubleArrayKlassObj);
261 f->do_ptr((void**)&_objectArrayKlassObj);
262
263 {
264 for (int i = 0; i < T_VOID+1; i++) {
265 if (_typeArrayKlassObjs[i] != NULL) {
266 assert(i >= T_BOOLEAN, "checking");
267 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
268 } else if (do_all) {
269 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
270 }
271 }
272 }
273
274 f->do_ptr((void**)&_the_array_interfaces_array);
275 f->do_ptr((void**)&_the_empty_int_array);
276 f->do_ptr((void**)&_the_empty_short_array);
277 f->do_ptr((void**)&_the_empty_method_array);
278 f->do_ptr((void**)&_the_empty_klass_array);
279 _finalizer_register_cache->serialize(f);
280 _loader_addClass_cache->serialize(f);
281 _pd_implies_cache->serialize(f);
282 _throw_illegal_access_error_cache->serialize(f);
283 _do_stack_walk_cache->serialize(f);
284 }
285
286 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
287 if (size < alignment || size % alignment != 0) {
288 vm_exit_during_initialization(
289 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
290 }
291 }
292
293 void initialize_basic_type_klass(Klass* k, TRAPS) {
294 Klass* ok = SystemDictionary::Object_klass();
295 #if INCLUDE_CDS
296 if (UseSharedSpaces) {
297 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
298 assert(k->super() == ok, "u3");
299 k->restore_unshareable_info(loader_data, Handle(), CHECK);
300 } else
301 #endif
302 {
303 k->initialize_supers(ok, CHECK);
304 }
305 k->append_to_sibling_list();
306 }
307
308 void Universe::genesis(TRAPS) {
309 ResourceMark rm;
310
311 { FlagSetting fs(_bootstrapping, true);
312
313 { MutexLocker mc(Compile_lock);
314
315 java_lang_Class::allocate_fixup_lists();
316
317 // determine base vtable size; without that we cannot create the array klasses
318 compute_base_vtable_size();
319
320 if (!UseSharedSpaces) {
321 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK);
322 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK);
323 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK);
324 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK);
325 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK);
326 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK);
327 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK);
328 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK);
329
330 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj;
331 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj;
332 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj;
333 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj;
334 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj;
335 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj;
336 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj;
337 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj;
338
339 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
340
341 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
342 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
343 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
344 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
345 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
346 }
347 }
348
349 vmSymbols::initialize(CHECK);
350
351 SystemDictionary::initialize(CHECK);
352
353 Klass* ok = SystemDictionary::Object_klass();
354
355 _the_null_string = StringTable::intern("null", CHECK);
356 _the_min_jint_string = StringTable::intern("-2147483648", CHECK);
357
358 #if INCLUDE_CDS
359 if (UseSharedSpaces) {
360 // Verify shared interfaces array.
361 assert(_the_array_interfaces_array->at(0) ==
362 SystemDictionary::Cloneable_klass(), "u3");
363 assert(_the_array_interfaces_array->at(1) ==
364 SystemDictionary::Serializable_klass(), "u3");
365 MetaspaceShared::fixup_mapped_heap_regions();
366 } else
367 #endif
368 {
369 // Set up shared interfaces array. (Do this before supers are set up.)
370 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
371 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
372 }
373
374 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
375 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
376 initialize_basic_type_klass(singleArrayKlassObj(), CHECK);
377 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
378 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
379 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
380 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
381 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
382 } // end of core bootstrapping
383
384 // Maybe this could be lifted up now that object array can be initialized
385 // during the bootstrapping.
386
387 // OLD
388 // Initialize _objectArrayKlass after core bootstraping to make
389 // sure the super class is set up properly for _objectArrayKlass.
390 // ---
391 // NEW
392 // Since some of the old system object arrays have been converted to
393 // ordinary object arrays, _objectArrayKlass will be loaded when
394 // SystemDictionary::initialize(CHECK); is run. See the extra check
395 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
396 _objectArrayKlassObj = InstanceKlass::
397 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
398 // OLD
399 // Add the class to the class hierarchy manually to make sure that
400 // its vtable is initialized after core bootstrapping is completed.
401 // ---
402 // New
403 // Have already been initialized.
404 _objectArrayKlassObj->append_to_sibling_list();
405
406 #ifdef ASSERT
407 if (FullGCALot) {
408 // Allocate an array of dummy objects.
409 // We'd like these to be at the bottom of the old generation,
410 // so that when we free one and then collect,
411 // (almost) the whole heap moves
412 // and we find out if we actually update all the oops correctly.
413 // But we can't allocate directly in the old generation,
414 // so we allocate wherever, and hope that the first collection
415 // moves these objects to the bottom of the old generation.
416 // We can allocate directly in the permanent generation, so we do.
417 int size;
418 if (UseConcMarkSweepGC) {
419 log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate");
420 size = FullGCALotDummies;
421 } else {
422 size = FullGCALotDummies * 2;
423 }
424 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
425 objArrayHandle dummy_array(THREAD, naked_array);
426 int i = 0;
427 while (i < size) {
428 // Allocate dummy in old generation
429 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK);
430 dummy_array->obj_at_put(i++, dummy);
431 }
432 {
433 // Only modify the global variable inside the mutex.
434 // If we had a race to here, the other dummy_array instances
435 // and their elements just get dropped on the floor, which is fine.
436 MutexLocker ml(FullGCALot_lock);
437 if (_fullgc_alot_dummy_array == NULL) {
438 _fullgc_alot_dummy_array = dummy_array();
439 }
440 }
441 assert(i == _fullgc_alot_dummy_array->length(), "just checking");
442 }
443 #endif
444
445 // Initialize dependency array for null class loader
446 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK);
447
448 }
449
450 void Universe::initialize_basic_type_mirrors(TRAPS) {
451 assert(_int_mirror==NULL, "basic type mirrors already initialized");
452 _int_mirror =
453 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK);
454 _float_mirror =
455 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK);
456 _double_mirror =
457 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK);
458 _byte_mirror =
459 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK);
460 _bool_mirror =
461 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
462 _char_mirror =
463 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK);
464 _long_mirror =
465 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK);
466 _short_mirror =
467 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK);
468 _void_mirror =
469 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK);
470
471 _mirrors[T_INT] = _int_mirror;
472 _mirrors[T_FLOAT] = _float_mirror;
473 _mirrors[T_DOUBLE] = _double_mirror;
474 _mirrors[T_BYTE] = _byte_mirror;
475 _mirrors[T_BOOLEAN] = _bool_mirror;
476 _mirrors[T_CHAR] = _char_mirror;
477 _mirrors[T_LONG] = _long_mirror;
478 _mirrors[T_SHORT] = _short_mirror;
479 _mirrors[T_VOID] = _void_mirror;
480 //_mirrors[T_OBJECT] = _object_klass->java_mirror();
481 //_mirrors[T_ARRAY] = _object_klass->java_mirror();
482 }
483
484 void Universe::fixup_mirrors(TRAPS) {
485 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
486 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
487 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
488 // that the number of objects allocated at this point is very small.
489 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
490 HandleMark hm(THREAD);
491 // Cache the start of the static fields
492 InstanceMirrorKlass::init_offset_of_static_fields();
493
494 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
495 int list_length = list->length();
496 for (int i = 0; i < list_length; i++) {
497 Klass* k = list->at(i);
498 assert(k->is_klass(), "List should only hold classes");
499 EXCEPTION_MARK;
500 java_lang_Class::fixup_mirror(k, CATCH);
501 }
502 delete java_lang_Class::fixup_mirror_list();
503 java_lang_Class::set_fixup_mirror_list(NULL);
504 }
505
506 #define assert_pll_locked(test) \
507 assert(Heap_lock->test(), "Reference pending list access requires lock")
508
509 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
510
511 oop Universe::reference_pending_list() {
512 if (Thread::current()->is_VM_thread()) {
513 assert_pll_locked(is_locked);
514 } else {
515 assert_pll_ownership();
516 }
517 return _reference_pending_list;
518 }
519
520 void Universe::set_reference_pending_list(oop list) {
521 assert_pll_ownership();
522 _reference_pending_list = list;
523 }
524
525 bool Universe::has_reference_pending_list() {
526 assert_pll_ownership();
527 return _reference_pending_list != NULL;
528 }
529
530 oop Universe::swap_reference_pending_list(oop list) {
531 assert_pll_locked(is_locked);
532 return Atomic::xchg(list, &_reference_pending_list);
533 }
534
535 #undef assert_pll_locked
536 #undef assert_pll_ownership
537
538
539 static bool has_run_finalizers_on_exit = false;
540
541 void Universe::run_finalizers_on_exit() {
542 if (has_run_finalizers_on_exit) return;
543 has_run_finalizers_on_exit = true;
544
545 // Called on VM exit. This ought to be run in a separate thread.
546 log_trace(ref)("Callback to run finalizers on exit");
547 {
548 PRESERVE_EXCEPTION_MARK;
549 Klass* finalizer_klass = SystemDictionary::Finalizer_klass();
550 JavaValue result(T_VOID);
551 JavaCalls::call_static(
552 &result,
553 finalizer_klass,
554 vmSymbols::run_finalizers_on_exit_name(),
555 vmSymbols::void_method_signature(),
556 THREAD
557 );
558 // Ignore any pending exceptions
559 CLEAR_PENDING_EXCEPTION;
560 }
561 }
562
563
564 // initialize_vtable could cause gc if
565 // 1) we specified true to initialize_vtable and
566 // 2) this ran after gc was enabled
567 // In case those ever change we use handles for oops
568 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) {
569 // init vtable of k and all subclasses
570 ko->vtable().initialize_vtable(false, CHECK);
571 if (ko->is_instance_klass()) {
572 for (Klass* sk = ko->subklass();
573 sk != NULL;
574 sk = sk->next_sibling()) {
575 reinitialize_vtable_of(sk, CHECK);
576 }
577 }
578 }
579
580
581 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) {
582 k->itable().initialize_itable(false, CHECK);
583 }
584
585
586 void Universe::reinitialize_itables(TRAPS) {
587 ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK);
588 }
589
590
591 bool Universe::on_page_boundary(void* addr) {
592 return is_aligned(addr, os::vm_page_size());
593 }
594
595
596 bool Universe::should_fill_in_stack_trace(Handle throwable) {
597 // never attempt to fill in the stack trace of preallocated errors that do not have
598 // backtrace. These errors are kept alive forever and may be "re-used" when all
599 // preallocated errors with backtrace have been consumed. Also need to avoid
600 // a potential loop which could happen if an out of memory occurs when attempting
601 // to allocate the backtrace.
602 return ((throwable() != Universe::_out_of_memory_error_java_heap) &&
603 (throwable() != Universe::_out_of_memory_error_metaspace) &&
604 (throwable() != Universe::_out_of_memory_error_class_metaspace) &&
605 (throwable() != Universe::_out_of_memory_error_array_size) &&
606 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) &&
607 (throwable() != Universe::_out_of_memory_error_realloc_objects));
608 }
609
610
611 oop Universe::gen_out_of_memory_error(oop default_err) {
612 // generate an out of memory error:
613 // - if there is a preallocated error and stack traces are available
614 // (j.l.Throwable is initialized), then return the preallocated
615 // error with a filled in stack trace, and with the message
616 // provided by the default error.
617 // - otherwise, return the default error, without a stack trace.
618 int next;
619 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
620 SystemDictionary::Throwable_klass()->is_initialized()) {
621 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);
622 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
623 } else {
624 next = -1;
625 }
626 if (next < 0) {
627 // all preallocated errors have been used.
628 // return default
629 return default_err;
630 } else {
631 Thread* THREAD = Thread::current();
632 Handle default_err_h(THREAD, default_err);
633 // get the error object at the slot and set set it to NULL so that the
634 // array isn't keeping it alive anymore.
635 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next));
636 assert(exc() != NULL, "slot has been used already");
637 preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
638
639 // use the message from the default error
640 oop msg = java_lang_Throwable::message(default_err_h());
641 assert(msg != NULL, "no message");
642 java_lang_Throwable::set_message(exc(), msg);
643
644 // populate the stack trace and return it.
645 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
646 return exc();
647 }
648 }
649
650 intptr_t Universe::_non_oop_bits = 0;
651
652 void* Universe::non_oop_word() {
653 // Neither the high bits nor the low bits of this value is allowed
654 // to look like (respectively) the high or low bits of a real oop.
655 //
656 // High and low are CPU-specific notions, but low always includes
657 // the low-order bit. Since oops are always aligned at least mod 4,
658 // setting the low-order bit will ensure that the low half of the
659 // word will never look like that of a real oop.
660 //
661 // Using the OS-supplied non-memory-address word (usually 0 or -1)
662 // will take care of the high bits, however many there are.
663
664 if (_non_oop_bits == 0) {
665 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
666 }
667
668 return (void*)_non_oop_bits;
669 }
670
671 jint universe_init() {
672 assert(!Universe::_fully_initialized, "called after initialize_vtables");
673 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
674 "LogHeapWordSize is incorrect.");
675 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
676 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
677 "oop size is not not a multiple of HeapWord size");
678
679 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
680
681 JavaClasses::compute_hard_coded_offsets();
682
683 jint status = Universe::initialize_heap();
684 if (status != JNI_OK) {
685 return status;
686 }
687
688 Metaspace::global_initialize();
689
690 AOTLoader::universe_init();
691
692 // Checks 'AfterMemoryInit' constraints.
693 if (!CommandLineFlagConstraintList::check_constraints(CommandLineFlagConstraint::AfterMemoryInit)) {
694 return JNI_EINVAL;
695 }
696
697 // Create memory for metadata. Must be after initializing heap for
698 // DumpSharedSpaces.
699 ClassLoaderData::init_null_class_loader_data();
700
701 // We have a heap so create the Method* caches before
702 // Metaspace::initialize_shared_spaces() tries to populate them.
703 Universe::_finalizer_register_cache = new LatestMethodCache();
704 Universe::_loader_addClass_cache = new LatestMethodCache();
705 Universe::_pd_implies_cache = new LatestMethodCache();
706 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
707 Universe::_do_stack_walk_cache = new LatestMethodCache();
708
709 #if INCLUDE_CDS
710 if (UseSharedSpaces) {
711 // Read the data structures supporting the shared spaces (shared
712 // system dictionary, symbol table, etc.). After that, access to
713 // the file (other than the mapped regions) is no longer needed, and
714 // the file is closed. Closing the file does not affect the
715 // currently mapped regions.
716 MetaspaceShared::initialize_shared_spaces();
717 StringTable::create_table();
718 } else
719 #endif
720 {
721 SymbolTable::create_table();
722 StringTable::create_table();
723
724 #if INCLUDE_CDS
725 if (DumpSharedSpaces) {
726 MetaspaceShared::prepare_for_dumping();
727 }
728 #endif
729 }
730 if (strlen(VerifySubSet) > 0) {
731 Universe::initialize_verify_flags();
732 }
733
734 ResolvedMethodTable::create_table();
735
736 return JNI_OK;
737 }
738
739 CollectedHeap* Universe::create_heap() {
740 assert(_collectedHeap == NULL, "Heap already created");
741 assert(GCArguments::is_initialized(), "GC must be initialized here");
742 return GCArguments::arguments()->create_heap();
743 }
744
745 // Choose the heap base address and oop encoding mode
746 // when compressed oops are used:
747 // Unscaled - Use 32-bits oops without encoding when
748 // NarrowOopHeapBaseMin + heap_size < 4Gb
749 // ZeroBased - Use zero based compressed oops with encoding when
750 // NarrowOopHeapBaseMin + heap_size < 32Gb
751 // HeapBased - Use compressed oops with heap base + encoding.
752
753 jint Universe::initialize_heap() {
754 jint status = JNI_ERR;
755
756 _collectedHeap = create_heap_ext();
757 if (_collectedHeap == NULL) {
758 _collectedHeap = create_heap();
759 }
760
761 status = _collectedHeap->initialize();
762 if (status != JNI_OK) {
763 return status;
764 }
765 log_info(gc)("Using %s", _collectedHeap->name());
766
767 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
768
769 #ifdef _LP64
770 if (UseCompressedOops) {
771 // Subtract a page because something can get allocated at heap base.
772 // This also makes implicit null checking work, because the
773 // memory+1 page below heap_base needs to cause a signal.
774 // See needs_explicit_null_check.
775 // Only set the heap base for compressed oops because it indicates
776 // compressed oops for pstack code.
777 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) {
778 // Didn't reserve heap below 4Gb. Must shift.
779 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
780 }
781 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) {
782 // Did reserve heap below 32Gb. Can use base == 0;
783 Universe::set_narrow_oop_base(0);
784 }
785
786 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base());
787
788 LogTarget(Info, gc, heap, coops) lt;
789 if (lt.is_enabled()) {
790 ResourceMark rm;
791 LogStream ls(lt);
792 Universe::print_compressed_oops_mode(&ls);
793 }
794
795 // Tell tests in which mode we run.
796 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode",
797 narrow_oop_mode_to_string(narrow_oop_mode()),
798 false));
799 }
800 // Universe::narrow_oop_base() is one page below the heap.
801 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() -
802 os::vm_page_size()) ||
803 Universe::narrow_oop_base() == NULL, "invalid value");
804 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes ||
805 Universe::narrow_oop_shift() == 0, "invalid value");
806 #endif
807
808 // We will never reach the CATCH below since Exceptions::_throw will cause
809 // the VM to exit if an exception is thrown during initialization
810
811 if (UseTLAB) {
812 assert(Universe::heap()->supports_tlab_allocation(),
813 "Should support thread-local allocation buffers");
814 ThreadLocalAllocBuffer::startup_initialization();
815 }
816 return JNI_OK;
817 }
818
819 void Universe::print_compressed_oops_mode(outputStream* st) {
820 st->print("Heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
821 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M);
822
823 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode()));
824
825 if (Universe::narrow_oop_base() != 0) {
826 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base()));
827 }
828
829 if (Universe::narrow_oop_shift() != 0) {
830 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
831 }
832
833 if (!Universe::narrow_oop_use_implicit_null_checks()) {
834 st->print(", no protected page in front of the heap");
835 }
836 st->cr();
837 }
838
839 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
840
841 assert(alignment <= Arguments::conservative_max_heap_alignment(),
842 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
843 alignment, Arguments::conservative_max_heap_alignment());
844
845 size_t total_reserved = align_up(heap_size, alignment);
846 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
847 "heap size is too big for compressed oops");
848
849 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size());
850 assert(!UseLargePages
851 || UseParallelGC
852 || use_large_pages, "Wrong alignment to use large pages");
853
854 // Now create the space.
855 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages);
856
857 if (total_rs.is_reserved()) {
858 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
859 "must be exactly of required size and alignment");
860 // We are good.
861
862 if (UseCompressedOops) {
863 // Universe::initialize_heap() will reset this to NULL if unscaled
864 // or zero-based narrow oops are actually used.
865 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
866 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
867 }
868
869 return total_rs;
870 }
871
872 vm_exit_during_initialization(
873 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
874 total_reserved/K));
875
876 // satisfy compiler
877 ShouldNotReachHere();
878 return ReservedHeapSpace(0, 0, false);
879 }
880
881
882 // It's the caller's responsibility to ensure glitch-freedom
883 // (if required).
884 void Universe::update_heap_info_at_gc() {
885 _heap_capacity_at_last_gc = heap()->capacity();
886 _heap_used_at_last_gc = heap()->used();
887 }
888
889
890 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) {
891 switch (mode) {
892 case UnscaledNarrowOop:
893 return "32-bit";
894 case ZeroBasedNarrowOop:
895 return "Zero based";
896 case DisjointBaseNarrowOop:
897 return "Non-zero disjoint base";
898 case HeapBasedNarrowOop:
899 return "Non-zero based";
900 default:
901 ShouldNotReachHere();
902 return "";
903 }
904 }
905
906
907 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() {
908 if (narrow_oop_base_disjoint()) {
909 return DisjointBaseNarrowOop;
910 }
911
912 if (narrow_oop_base() != 0) {
913 return HeapBasedNarrowOop;
914 }
915
916 if (narrow_oop_shift() != 0) {
917 return ZeroBasedNarrowOop;
918 }
919
920 return UnscaledNarrowOop;
921 }
922
923 void initialize_known_method(LatestMethodCache* method_cache,
924 InstanceKlass* ik,
925 const char* method,
926 Symbol* signature,
927 bool is_static, TRAPS)
928 {
929 TempNewSymbol name = SymbolTable::new_symbol(method, CHECK);
930 Method* m = NULL;
931 // The klass must be linked before looking up the method.
932 if (!ik->link_class_or_fail(THREAD) ||
933 ((m = ik->find_method(name, signature)) == NULL) ||
934 is_static != m->is_static()) {
935 ResourceMark rm(THREAD);
936 // NoSuchMethodException doesn't actually work because it tries to run the
937 // <init> function before java_lang_Class is linked. Print error and exit.
938 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
939 ik->name()->as_C_string(), method));
940 }
941 method_cache->init(ik, m);
942 }
943
944 void Universe::initialize_known_methods(TRAPS) {
945 // Set up static method for registering finalizers
946 initialize_known_method(_finalizer_register_cache,
947 SystemDictionary::Finalizer_klass(),
948 "register",
949 vmSymbols::object_void_signature(), true, CHECK);
950
951 initialize_known_method(_throw_illegal_access_error_cache,
952 SystemDictionary::internal_Unsafe_klass(),
953 "throwIllegalAccessError",
954 vmSymbols::void_method_signature(), true, CHECK);
955
956 // Set up method for registering loaded classes in class loader vector
957 initialize_known_method(_loader_addClass_cache,
958 SystemDictionary::ClassLoader_klass(),
959 "addClass",
960 vmSymbols::class_void_signature(), false, CHECK);
961
962 // Set up method for checking protection domain
963 initialize_known_method(_pd_implies_cache,
964 SystemDictionary::ProtectionDomain_klass(),
965 "impliesCreateAccessControlContext",
966 vmSymbols::void_boolean_signature(), false, CHECK);
967
968 // Set up method for stack walking
969 initialize_known_method(_do_stack_walk_cache,
970 SystemDictionary::AbstractStackWalker_klass(),
971 "doStackWalk",
972 vmSymbols::doStackWalk_signature(), false, CHECK);
973 }
974
975 void universe2_init() {
976 EXCEPTION_MARK;
977 Universe::genesis(CATCH);
978 }
979
980 // Set after initialization of the module runtime, call_initModuleRuntime
981 void universe_post_module_init() {
982 Universe::_module_initialized = true;
983 }
984
985 bool universe_post_init() {
986 assert(!is_init_completed(), "Error: initialization not yet completed!");
987 Universe::_fully_initialized = true;
988 EXCEPTION_MARK;
989 { ResourceMark rm;
990 Interpreter::initialize(); // needed for interpreter entry points
991 if (!UseSharedSpaces) {
992 HandleMark hm(THREAD);
993 Klass* ok = SystemDictionary::Object_klass();
994 Universe::reinitialize_vtable_of(ok, CHECK_false);
995 Universe::reinitialize_itables(CHECK_false);
996 }
997 }
998
999 HandleMark hm(THREAD);
1000 // Setup preallocated empty java.lang.Class array
1001 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
1002
1003 // Setup preallocated OutOfMemoryError errors
1004 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
1005 InstanceKlass* ik = InstanceKlass::cast(k);
1006 Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false);
1007 Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false);
1008 Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false);
1009 Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false);
1010 Universe::_out_of_memory_error_gc_overhead_limit =
1011 ik->allocate_instance(CHECK_false);
1012 Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false);
1013
1014 // Setup preallocated cause message for delayed StackOverflowError
1015 if (StackReservedPages > 0) {
1016 Universe::_delayed_stack_overflow_error_message =
1017 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
1018 }
1019
1020 // Setup preallocated NullPointerException
1021 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1022 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
1023 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1024 // Setup preallocated ArithmeticException
1025 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1026 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
1027 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1028 // Virtual Machine Error for when we get into a situation we can't resolve
1029 k = SystemDictionary::resolve_or_fail(
1030 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
1031 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1032 if (!linked) {
1033 tty->print_cr("Unable to link/verify VirtualMachineError class");
1034 return false; // initialization failed
1035 }
1036 Universe::_virtual_machine_error_instance =
1037 InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1038
1039 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1040
1041 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
1042 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
1043
1044 msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
1045 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
1046 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
1047 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
1048
1049 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
1050 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
1051
1052 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
1053 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
1054
1055 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false);
1056 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg());
1057
1058 msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1059 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
1060
1061 // Setup the array of errors that have preallocated backtrace
1062 k = Universe::_out_of_memory_error_java_heap->klass();
1063 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
1064 ik = InstanceKlass::cast(k);
1065
1066 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
1067 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false);
1068 for (int i=0; i<len; i++) {
1069 oop err = ik->allocate_instance(CHECK_false);
1070 Handle err_h = Handle(THREAD, err);
1071 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
1072 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
1073 }
1074 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
1075
1076 Universe::initialize_known_methods(CHECK_false);
1077
1078 // This needs to be done before the first scavenge/gc, since
1079 // it's an input to soft ref clearing policy.
1080 {
1081 MutexLocker x(Heap_lock);
1082 Universe::update_heap_info_at_gc();
1083 }
1084
1085 // ("weak") refs processing infrastructure initialization
1086 Universe::heap()->post_initialize();
1087
1088 // Initialize performance counters for metaspaces
1089 MetaspaceCounters::initialize_performance_counters();
1090 CompressedClassSpaceCounters::initialize_performance_counters();
1091
1092 MemoryService::add_metaspace_memory_pools();
1093
1094 MemoryService::set_universe_heap(Universe::heap());
1095 #if INCLUDE_CDS
1096 SharedClassUtil::initialize(CHECK_false);
1097 #endif
1098 return true;
1099 }
1100
1101
1102 void Universe::compute_base_vtable_size() {
1103 _base_vtable_size = ClassLoader::compute_Object_vtable();
1104 }
1105
1106 void Universe::print_on(outputStream* st) {
1107 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1108 st->print_cr("Heap");
1109 heap()->print_on(st);
1110 }
1111
1112 void Universe::print_heap_at_SIGBREAK() {
1113 if (PrintHeapAtSIGBREAK) {
1114 print_on(tty);
1115 tty->cr();
1116 tty->flush();
1117 }
1118 }
1119
1120 void Universe::print_heap_before_gc() {
1121 LogTarget(Debug, gc, heap) lt;
1122 if (lt.is_enabled()) {
1123 LogStream ls(lt);
1124 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1125 ResourceMark rm;
1126 heap()->print_on(&ls);
1127 }
1128 }
1129
1130 void Universe::print_heap_after_gc() {
1131 LogTarget(Debug, gc, heap) lt;
1132 if (lt.is_enabled()) {
1133 LogStream ls(lt);
1134 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1135 ResourceMark rm;
1136 heap()->print_on(&ls);
1137 }
1138 }
1139
1140 void Universe::initialize_verify_flags() {
1141 verify_flags = 0;
1142 const char delimiter[] = " ,";
1143
1144 size_t length = strlen(VerifySubSet);
1145 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1146 strncpy(subset_list, VerifySubSet, length + 1);
1147
1148 char* token = strtok(subset_list, delimiter);
1149 while (token != NULL) {
1150 if (strcmp(token, "threads") == 0) {
1151 verify_flags |= Verify_Threads;
1152 } else if (strcmp(token, "heap") == 0) {
1153 verify_flags |= Verify_Heap;
1154 } else if (strcmp(token, "symbol_table") == 0) {
1155 verify_flags |= Verify_SymbolTable;
1156 } else if (strcmp(token, "string_table") == 0) {
1157 verify_flags |= Verify_StringTable;
1158 } else if (strcmp(token, "codecache") == 0) {
1159 verify_flags |= Verify_CodeCache;
1160 } else if (strcmp(token, "dictionary") == 0) {
1161 verify_flags |= Verify_SystemDictionary;
1162 } else if (strcmp(token, "classloader_data_graph") == 0) {
1163 verify_flags |= Verify_ClassLoaderDataGraph;
1164 } else if (strcmp(token, "metaspace") == 0) {
1165 verify_flags |= Verify_MetaspaceAux;
1166 } else if (strcmp(token, "jni_handles") == 0) {
1167 verify_flags |= Verify_JNIHandles;
1168 } else if (strcmp(token, "codecache_oops") == 0) {
1169 verify_flags |= Verify_CodeCacheOops;
1170 } else {
1171 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1172 }
1173 token = strtok(NULL, delimiter);
1174 }
1175 FREE_C_HEAP_ARRAY(char, subset_list);
1176 }
1177
1178 bool Universe::should_verify_subset(uint subset) {
1179 if (verify_flags & subset) {
1180 return true;
1181 }
1182 return false;
1183 }
1184
1185 void Universe::verify(VerifyOption option, const char* prefix) {
1186 // The use of _verify_in_progress is a temporary work around for
1187 // 6320749. Don't bother with a creating a class to set and clear
1188 // it since it is only used in this method and the control flow is
1189 // straight forward.
1190 _verify_in_progress = true;
1191
1192 COMPILER2_PRESENT(
1193 assert(!DerivedPointerTable::is_active(),
1194 "DPT should not be active during verification "
1195 "(of thread stacks below)");
1196 )
1197
1198 ResourceMark rm;
1199 HandleMark hm; // Handles created during verification can be zapped
1200 _verify_count++;
1201
1202 FormatBuffer<> title("Verifying %s", prefix);
1203 GCTraceTime(Info, gc, verify) tm(title.buffer());
1204 if (should_verify_subset(Verify_Threads)) {
1205 log_debug(gc, verify)("Threads");
1206 Threads::verify();
1207 }
1208 if (should_verify_subset(Verify_Heap)) {
1209 log_debug(gc, verify)("Heap");
1210 heap()->verify(option);
1211 }
1212 if (should_verify_subset(Verify_SymbolTable)) {
1213 log_debug(gc, verify)("SymbolTable");
1214 SymbolTable::verify();
1215 }
1216 if (should_verify_subset(Verify_StringTable)) {
1217 log_debug(gc, verify)("StringTable");
1218 StringTable::verify();
1219 }
1220 if (should_verify_subset(Verify_CodeCache)) {
1221 {
1222 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1223 log_debug(gc, verify)("CodeCache");
1224 CodeCache::verify();
1225 }
1226 }
1227 if (should_verify_subset(Verify_SystemDictionary)) {
1228 log_debug(gc, verify)("SystemDictionary");
1229 SystemDictionary::verify();
1230 }
1231 #ifndef PRODUCT
1232 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1233 log_debug(gc, verify)("ClassLoaderDataGraph");
1234 ClassLoaderDataGraph::verify();
1235 }
1236 #endif
1237 if (should_verify_subset(Verify_MetaspaceAux)) {
1238 log_debug(gc, verify)("MetaspaceAux");
1239 MetaspaceAux::verify_free_chunks();
1240 }
1241 if (should_verify_subset(Verify_JNIHandles)) {
1242 log_debug(gc, verify)("JNIHandles");
1243 JNIHandles::verify();
1244 }
1245 if (should_verify_subset(Verify_CodeCacheOops)) {
1246 log_debug(gc, verify)("CodeCache Oops");
1247 CodeCache::verify_oops();
1248 }
1249
1250 _verify_in_progress = false;
1251 }
1252
1253
1254 #ifndef PRODUCT
1255 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1256 assert(low_boundary < high_boundary, "bad interval");
1257
1258 // decide which low-order bits we require to be clear:
1259 size_t alignSize = MinObjAlignmentInBytes;
1260 size_t min_object_size = CollectedHeap::min_fill_size();
1261
1262 // make an inclusive limit:
1263 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1264 uintptr_t min = (uintptr_t)low_boundary;
1265 assert(min < max, "bad interval");
1266 uintptr_t diff = max ^ min;
1267
1268 // throw away enough low-order bits to make the diff vanish
1269 uintptr_t mask = (uintptr_t)(-1);
1270 while ((mask & diff) != 0)
1271 mask <<= 1;
1272 uintptr_t bits = (min & mask);
1273 assert(bits == (max & mask), "correct mask");
1274 // check an intermediate value between min and max, just to make sure:
1275 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1276
1277 // require address alignment, too:
1278 mask |= (alignSize - 1);
1279
1280 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1281 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1282 }
1283 _verify_oop_mask = mask;
1284 _verify_oop_bits = bits;
1285 }
1286
1287 // Oop verification (see MacroAssembler::verify_oop)
1288
1289 uintptr_t Universe::verify_oop_mask() {
1290 MemRegion m = heap()->reserved_region();
1291 calculate_verify_data(m.start(), m.end());
1292 return _verify_oop_mask;
1293 }
1294
1295 uintptr_t Universe::verify_oop_bits() {
1296 MemRegion m = heap()->reserved_region();
1297 calculate_verify_data(m.start(), m.end());
1298 return _verify_oop_bits;
1299 }
1300
1301 uintptr_t Universe::verify_mark_mask() {
1302 return markOopDesc::lock_mask_in_place;
1303 }
1304
1305 uintptr_t Universe::verify_mark_bits() {
1306 intptr_t mask = verify_mark_mask();
1307 intptr_t bits = (intptr_t)markOopDesc::prototype();
1308 assert((bits & ~mask) == 0, "no stray header bits");
1309 return bits;
1310 }
1311 #endif // PRODUCT
1312
1313
1314 void Universe::compute_verify_oop_data() {
1315 verify_oop_mask();
1316 verify_oop_bits();
1317 verify_mark_mask();
1318 verify_mark_bits();
1319 }
1320
1321
1322 void LatestMethodCache::init(Klass* k, Method* m) {
1323 if (!UseSharedSpaces) {
1324 _klass = k;
1325 }
1326 #ifndef PRODUCT
1327 else {
1328 // sharing initilization should have already set up _klass
1329 assert(_klass != NULL, "just checking");
1330 }
1331 #endif
1332
1333 _method_idnum = m->method_idnum();
1334 assert(_method_idnum >= 0, "sanity check");
1335 }
1336
1337
1338 Method* LatestMethodCache::get_method() {
1339 if (klass() == NULL) return NULL;
1340 InstanceKlass* ik = InstanceKlass::cast(klass());
1341 Method* m = ik->method_with_idnum(method_idnum());
1342 assert(m != NULL, "sanity check");
1343 return m;
1344 }
1345
1346
1347 #ifdef ASSERT
1348 // Release dummy object(s) at bottom of heap
1349 bool Universe::release_fullgc_alot_dummy() {
1350 MutexLocker ml(FullGCALot_lock);
1351 if (_fullgc_alot_dummy_array != NULL) {
1352 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
1353 // No more dummies to release, release entire array instead
1354 _fullgc_alot_dummy_array = NULL;
1355 return false;
1356 }
1357 if (!UseConcMarkSweepGC) {
1358 // Release dummy at bottom of old generation
1359 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1360 }
1361 // Release dummy at bottom of permanent generation
1362 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1363 }
1364 return true;
1365 }
1366
1367 #endif // ASSERT