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 #ifdef AARCH64
169 uint64_t Universe::_narrow_klass_range = (uint64_t(max_juint)+1);
170 #endif
171
172 void Universe::basic_type_classes_do(void f(Klass*)) {
173 f(boolArrayKlassObj());
174 f(byteArrayKlassObj());
175 f(charArrayKlassObj());
176 f(intArrayKlassObj());
177 f(shortArrayKlassObj());
178 f(longArrayKlassObj());
179 f(singleArrayKlassObj());
180 f(doubleArrayKlassObj());
181 }
182
183 void Universe::oops_do(OopClosure* f, bool do_all) {
184
185 f->do_oop((oop*) &_int_mirror);
186 f->do_oop((oop*) &_float_mirror);
187 f->do_oop((oop*) &_double_mirror);
188 f->do_oop((oop*) &_byte_mirror);
189 f->do_oop((oop*) &_bool_mirror);
190 f->do_oop((oop*) &_char_mirror);
191 f->do_oop((oop*) &_long_mirror);
192 f->do_oop((oop*) &_short_mirror);
193 f->do_oop((oop*) &_void_mirror);
194
195 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
196 f->do_oop((oop*) &_mirrors[i]);
197 }
198 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
199
200 f->do_oop((oop*)&_the_empty_class_klass_array);
201 f->do_oop((oop*)&_the_null_string);
202 f->do_oop((oop*)&_the_min_jint_string);
203 f->do_oop((oop*)&_out_of_memory_error_java_heap);
204 f->do_oop((oop*)&_out_of_memory_error_metaspace);
205 f->do_oop((oop*)&_out_of_memory_error_class_metaspace);
206 f->do_oop((oop*)&_out_of_memory_error_array_size);
207 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit);
208 f->do_oop((oop*)&_out_of_memory_error_realloc_objects);
209 f->do_oop((oop*)&_delayed_stack_overflow_error_message);
210 f->do_oop((oop*)&_preallocated_out_of_memory_error_array);
211 f->do_oop((oop*)&_null_ptr_exception_instance);
212 f->do_oop((oop*)&_arithmetic_exception_instance);
213 f->do_oop((oop*)&_virtual_machine_error_instance);
214 f->do_oop((oop*)&_main_thread_group);
215 f->do_oop((oop*)&_system_thread_group);
216 f->do_oop((oop*)&_vm_exception);
217 f->do_oop((oop*)&_allocation_context_notification_obj);
218 f->do_oop((oop*)&_reference_pending_list);
219 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);)
220 }
221
222 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
223 it->push(&_klass);
224 }
225
226 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
227 it->push(&_boolArrayKlassObj);
228 it->push(&_byteArrayKlassObj);
229 it->push(&_charArrayKlassObj);
230 it->push(&_intArrayKlassObj);
231 it->push(&_shortArrayKlassObj);
232 it->push(&_longArrayKlassObj);
233 it->push(&_singleArrayKlassObj);
234 it->push(&_doubleArrayKlassObj);
235 for (int i = 0; i < T_VOID+1; i++) {
236 it->push(&_typeArrayKlassObjs[i]);
237 }
238 it->push(&_objectArrayKlassObj);
239
240 it->push(&_the_empty_int_array);
241 it->push(&_the_empty_short_array);
242 it->push(&_the_empty_klass_array);
243 it->push(&_the_empty_method_array);
244 it->push(&_the_array_interfaces_array);
245
246 _finalizer_register_cache->metaspace_pointers_do(it);
247 _loader_addClass_cache->metaspace_pointers_do(it);
248 _pd_implies_cache->metaspace_pointers_do(it);
249 _throw_illegal_access_error_cache->metaspace_pointers_do(it);
250 _do_stack_walk_cache->metaspace_pointers_do(it);
251 }
252
253 // Serialize metadata in and out of CDS archive, not oops.
254 void Universe::serialize(SerializeClosure* f, bool do_all) {
255
256 f->do_ptr((void**)&_boolArrayKlassObj);
257 f->do_ptr((void**)&_byteArrayKlassObj);
258 f->do_ptr((void**)&_charArrayKlassObj);
259 f->do_ptr((void**)&_intArrayKlassObj);
260 f->do_ptr((void**)&_shortArrayKlassObj);
261 f->do_ptr((void**)&_longArrayKlassObj);
262 f->do_ptr((void**)&_singleArrayKlassObj);
263 f->do_ptr((void**)&_doubleArrayKlassObj);
264 f->do_ptr((void**)&_objectArrayKlassObj);
265
266 {
267 for (int i = 0; i < T_VOID+1; i++) {
268 if (_typeArrayKlassObjs[i] != NULL) {
269 assert(i >= T_BOOLEAN, "checking");
270 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
271 } else if (do_all) {
272 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
273 }
274 }
275 }
276
277 f->do_ptr((void**)&_the_array_interfaces_array);
278 f->do_ptr((void**)&_the_empty_int_array);
279 f->do_ptr((void**)&_the_empty_short_array);
280 f->do_ptr((void**)&_the_empty_method_array);
281 f->do_ptr((void**)&_the_empty_klass_array);
282 _finalizer_register_cache->serialize(f);
283 _loader_addClass_cache->serialize(f);
284 _pd_implies_cache->serialize(f);
285 _throw_illegal_access_error_cache->serialize(f);
286 _do_stack_walk_cache->serialize(f);
287 }
288
289 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
290 if (size < alignment || size % alignment != 0) {
291 vm_exit_during_initialization(
292 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
293 }
294 }
295
296 void initialize_basic_type_klass(Klass* k, TRAPS) {
297 Klass* ok = SystemDictionary::Object_klass();
298 #if INCLUDE_CDS
299 if (UseSharedSpaces) {
300 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
301 assert(k->super() == ok, "u3");
302 k->restore_unshareable_info(loader_data, Handle(), CHECK);
303 } else
304 #endif
305 {
306 k->initialize_supers(ok, CHECK);
307 }
308 k->append_to_sibling_list();
309 }
310
311 void Universe::genesis(TRAPS) {
312 ResourceMark rm;
313
314 { FlagSetting fs(_bootstrapping, true);
315
316 { MutexLocker mc(Compile_lock);
317
318 java_lang_Class::allocate_fixup_lists();
319
320 // determine base vtable size; without that we cannot create the array klasses
321 compute_base_vtable_size();
322
323 if (!UseSharedSpaces) {
324 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK);
325 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK);
326 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK);
327 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK);
328 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK);
329 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK);
330 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK);
331 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK);
332
333 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj;
334 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj;
335 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj;
336 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj;
337 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj;
338 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj;
339 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj;
340 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj;
341
342 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
343
344 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
345 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
346 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
347 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
348 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
349 }
350 }
351
352 vmSymbols::initialize(CHECK);
353
354 SystemDictionary::initialize(CHECK);
355
356 Klass* ok = SystemDictionary::Object_klass();
357
358 _the_null_string = StringTable::intern("null", CHECK);
359 _the_min_jint_string = StringTable::intern("-2147483648", CHECK);
360
361 #if INCLUDE_CDS
362 if (UseSharedSpaces) {
363 // Verify shared interfaces array.
364 assert(_the_array_interfaces_array->at(0) ==
365 SystemDictionary::Cloneable_klass(), "u3");
366 assert(_the_array_interfaces_array->at(1) ==
367 SystemDictionary::Serializable_klass(), "u3");
368 MetaspaceShared::fixup_mapped_heap_regions();
369 } else
370 #endif
371 {
372 // Set up shared interfaces array. (Do this before supers are set up.)
373 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
374 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
375 }
376
377 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
378 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
379 initialize_basic_type_klass(singleArrayKlassObj(), CHECK);
380 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
381 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
382 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
383 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
384 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
385 } // end of core bootstrapping
386
387 // Maybe this could be lifted up now that object array can be initialized
388 // during the bootstrapping.
389
390 // OLD
391 // Initialize _objectArrayKlass after core bootstraping to make
392 // sure the super class is set up properly for _objectArrayKlass.
393 // ---
394 // NEW
395 // Since some of the old system object arrays have been converted to
396 // ordinary object arrays, _objectArrayKlass will be loaded when
397 // SystemDictionary::initialize(CHECK); is run. See the extra check
398 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
399 _objectArrayKlassObj = InstanceKlass::
400 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
401 // OLD
402 // Add the class to the class hierarchy manually to make sure that
403 // its vtable is initialized after core bootstrapping is completed.
404 // ---
405 // New
406 // Have already been initialized.
407 _objectArrayKlassObj->append_to_sibling_list();
408
409 #ifdef ASSERT
410 if (FullGCALot) {
411 // Allocate an array of dummy objects.
412 // We'd like these to be at the bottom of the old generation,
413 // so that when we free one and then collect,
414 // (almost) the whole heap moves
415 // and we find out if we actually update all the oops correctly.
416 // But we can't allocate directly in the old generation,
417 // so we allocate wherever, and hope that the first collection
418 // moves these objects to the bottom of the old generation.
419 // We can allocate directly in the permanent generation, so we do.
420 int size;
421 if (UseConcMarkSweepGC) {
422 log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate");
423 size = FullGCALotDummies;
424 } else {
425 size = FullGCALotDummies * 2;
426 }
427 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
428 objArrayHandle dummy_array(THREAD, naked_array);
429 int i = 0;
430 while (i < size) {
431 // Allocate dummy in old generation
432 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK);
433 dummy_array->obj_at_put(i++, dummy);
434 }
435 {
436 // Only modify the global variable inside the mutex.
437 // If we had a race to here, the other dummy_array instances
438 // and their elements just get dropped on the floor, which is fine.
439 MutexLocker ml(FullGCALot_lock);
440 if (_fullgc_alot_dummy_array == NULL) {
441 _fullgc_alot_dummy_array = dummy_array();
442 }
443 }
444 assert(i == _fullgc_alot_dummy_array->length(), "just checking");
445 }
446 #endif
447
448 // Initialize dependency array for null class loader
449 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK);
450
451 }
452
453 void Universe::initialize_basic_type_mirrors(TRAPS) {
454 assert(_int_mirror==NULL, "basic type mirrors already initialized");
455 _int_mirror =
456 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK);
457 _float_mirror =
458 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK);
459 _double_mirror =
460 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK);
461 _byte_mirror =
462 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK);
463 _bool_mirror =
464 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
465 _char_mirror =
466 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK);
467 _long_mirror =
468 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK);
469 _short_mirror =
470 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK);
471 _void_mirror =
472 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK);
473
474 _mirrors[T_INT] = _int_mirror;
475 _mirrors[T_FLOAT] = _float_mirror;
476 _mirrors[T_DOUBLE] = _double_mirror;
477 _mirrors[T_BYTE] = _byte_mirror;
478 _mirrors[T_BOOLEAN] = _bool_mirror;
479 _mirrors[T_CHAR] = _char_mirror;
480 _mirrors[T_LONG] = _long_mirror;
481 _mirrors[T_SHORT] = _short_mirror;
482 _mirrors[T_VOID] = _void_mirror;
483 //_mirrors[T_OBJECT] = _object_klass->java_mirror();
484 //_mirrors[T_ARRAY] = _object_klass->java_mirror();
485 }
486
487 void Universe::fixup_mirrors(TRAPS) {
488 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
489 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
490 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
491 // that the number of objects allocated at this point is very small.
492 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
493 HandleMark hm(THREAD);
494 // Cache the start of the static fields
495 InstanceMirrorKlass::init_offset_of_static_fields();
496
497 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
498 int list_length = list->length();
499 for (int i = 0; i < list_length; i++) {
500 Klass* k = list->at(i);
501 assert(k->is_klass(), "List should only hold classes");
502 EXCEPTION_MARK;
503 java_lang_Class::fixup_mirror(k, CATCH);
504 }
505 delete java_lang_Class::fixup_mirror_list();
506 java_lang_Class::set_fixup_mirror_list(NULL);
507 }
508
509 #define assert_pll_locked(test) \
510 assert(Heap_lock->test(), "Reference pending list access requires lock")
511
512 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
513
514 oop Universe::reference_pending_list() {
515 if (Thread::current()->is_VM_thread()) {
516 assert_pll_locked(is_locked);
517 } else {
518 assert_pll_ownership();
519 }
520 return _reference_pending_list;
521 }
522
523 void Universe::set_reference_pending_list(oop list) {
524 assert_pll_ownership();
525 _reference_pending_list = list;
526 }
527
528 bool Universe::has_reference_pending_list() {
529 assert_pll_ownership();
530 return _reference_pending_list != NULL;
531 }
532
533 oop Universe::swap_reference_pending_list(oop list) {
534 assert_pll_locked(is_locked);
535 return Atomic::xchg(list, &_reference_pending_list);
536 }
537
538 #undef assert_pll_locked
539 #undef assert_pll_ownership
540
541
542 static bool has_run_finalizers_on_exit = false;
543
544 void Universe::run_finalizers_on_exit() {
545 if (has_run_finalizers_on_exit) return;
546 has_run_finalizers_on_exit = true;
547
548 // Called on VM exit. This ought to be run in a separate thread.
549 log_trace(ref)("Callback to run finalizers on exit");
550 {
551 PRESERVE_EXCEPTION_MARK;
552 Klass* finalizer_klass = SystemDictionary::Finalizer_klass();
553 JavaValue result(T_VOID);
554 JavaCalls::call_static(
555 &result,
556 finalizer_klass,
557 vmSymbols::run_finalizers_on_exit_name(),
558 vmSymbols::void_method_signature(),
559 THREAD
560 );
561 // Ignore any pending exceptions
562 CLEAR_PENDING_EXCEPTION;
563 }
564 }
565
566
567 // initialize_vtable could cause gc if
568 // 1) we specified true to initialize_vtable and
569 // 2) this ran after gc was enabled
570 // In case those ever change we use handles for oops
571 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) {
572 // init vtable of k and all subclasses
573 ko->vtable().initialize_vtable(false, CHECK);
574 if (ko->is_instance_klass()) {
575 for (Klass* sk = ko->subklass();
576 sk != NULL;
577 sk = sk->next_sibling()) {
578 reinitialize_vtable_of(sk, CHECK);
579 }
580 }
581 }
582
583
584 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) {
585 k->itable().initialize_itable(false, CHECK);
586 }
587
588
589 void Universe::reinitialize_itables(TRAPS) {
590 ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK);
591 }
592
593
594 bool Universe::on_page_boundary(void* addr) {
595 return is_aligned(addr, os::vm_page_size());
596 }
597
598
599 bool Universe::should_fill_in_stack_trace(Handle throwable) {
600 // never attempt to fill in the stack trace of preallocated errors that do not have
601 // backtrace. These errors are kept alive forever and may be "re-used" when all
602 // preallocated errors with backtrace have been consumed. Also need to avoid
603 // a potential loop which could happen if an out of memory occurs when attempting
604 // to allocate the backtrace.
605 return ((throwable() != Universe::_out_of_memory_error_java_heap) &&
606 (throwable() != Universe::_out_of_memory_error_metaspace) &&
607 (throwable() != Universe::_out_of_memory_error_class_metaspace) &&
608 (throwable() != Universe::_out_of_memory_error_array_size) &&
609 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) &&
610 (throwable() != Universe::_out_of_memory_error_realloc_objects));
611 }
612
613
614 oop Universe::gen_out_of_memory_error(oop default_err) {
615 // generate an out of memory error:
616 // - if there is a preallocated error and stack traces are available
617 // (j.l.Throwable is initialized), then return the preallocated
618 // error with a filled in stack trace, and with the message
619 // provided by the default error.
620 // - otherwise, return the default error, without a stack trace.
621 int next;
622 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
623 SystemDictionary::Throwable_klass()->is_initialized()) {
624 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);
625 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
626 } else {
627 next = -1;
628 }
629 if (next < 0) {
630 // all preallocated errors have been used.
631 // return default
632 return default_err;
633 } else {
634 Thread* THREAD = Thread::current();
635 Handle default_err_h(THREAD, default_err);
636 // get the error object at the slot and set set it to NULL so that the
637 // array isn't keeping it alive anymore.
638 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next));
639 assert(exc() != NULL, "slot has been used already");
640 preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
641
642 // use the message from the default error
643 oop msg = java_lang_Throwable::message(default_err_h());
644 assert(msg != NULL, "no message");
645 java_lang_Throwable::set_message(exc(), msg);
646
647 // populate the stack trace and return it.
648 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
649 return exc();
650 }
651 }
652
653 intptr_t Universe::_non_oop_bits = 0;
654
655 void* Universe::non_oop_word() {
656 // Neither the high bits nor the low bits of this value is allowed
657 // to look like (respectively) the high or low bits of a real oop.
658 //
659 // High and low are CPU-specific notions, but low always includes
660 // the low-order bit. Since oops are always aligned at least mod 4,
661 // setting the low-order bit will ensure that the low half of the
662 // word will never look like that of a real oop.
663 //
664 // Using the OS-supplied non-memory-address word (usually 0 or -1)
665 // will take care of the high bits, however many there are.
666
667 if (_non_oop_bits == 0) {
668 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
669 }
670
671 return (void*)_non_oop_bits;
672 }
673
674 jint universe_init() {
675 assert(!Universe::_fully_initialized, "called after initialize_vtables");
676 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
677 "LogHeapWordSize is incorrect.");
678 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
679 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
680 "oop size is not not a multiple of HeapWord size");
681
682 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
683
684 JavaClasses::compute_hard_coded_offsets();
685
686 jint status = Universe::initialize_heap();
687 if (status != JNI_OK) {
688 return status;
689 }
690
691 Metaspace::global_initialize();
692
693 // Initialize performance counters for metaspaces
694 MetaspaceCounters::initialize_performance_counters();
695 CompressedClassSpaceCounters::initialize_performance_counters();
696
697 AOTLoader::universe_init();
698
699 // Checks 'AfterMemoryInit' constraints.
700 if (!CommandLineFlagConstraintList::check_constraints(CommandLineFlagConstraint::AfterMemoryInit)) {
701 return JNI_EINVAL;
702 }
703
704 // Create memory for metadata. Must be after initializing heap for
705 // DumpSharedSpaces.
706 ClassLoaderData::init_null_class_loader_data();
707
708 // We have a heap so create the Method* caches before
709 // Metaspace::initialize_shared_spaces() tries to populate them.
710 Universe::_finalizer_register_cache = new LatestMethodCache();
711 Universe::_loader_addClass_cache = new LatestMethodCache();
712 Universe::_pd_implies_cache = new LatestMethodCache();
713 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
714 Universe::_do_stack_walk_cache = new LatestMethodCache();
715
716 #if INCLUDE_CDS
717 if (UseSharedSpaces) {
718 // Read the data structures supporting the shared spaces (shared
719 // system dictionary, symbol table, etc.). After that, access to
720 // the file (other than the mapped regions) is no longer needed, and
721 // the file is closed. Closing the file does not affect the
722 // currently mapped regions.
723 MetaspaceShared::initialize_shared_spaces();
724 StringTable::create_table();
725 } else
726 #endif
727 {
728 SymbolTable::create_table();
729 StringTable::create_table();
730
731 #if INCLUDE_CDS
732 if (DumpSharedSpaces) {
733 MetaspaceShared::prepare_for_dumping();
734 }
735 #endif
736 }
737 if (strlen(VerifySubSet) > 0) {
738 Universe::initialize_verify_flags();
739 }
740
741 ResolvedMethodTable::create_table();
742
743 return JNI_OK;
744 }
745
746 CollectedHeap* Universe::create_heap() {
747 assert(_collectedHeap == NULL, "Heap already created");
748 assert(GCArguments::is_initialized(), "GC must be initialized here");
749 return GCArguments::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 jint status = JNI_ERR;
762
763 _collectedHeap = create_heap_ext();
764 if (_collectedHeap == NULL) {
765 _collectedHeap = create_heap();
766 }
767
768 status = _collectedHeap->initialize();
769 if (status != JNI_OK) {
770 return status;
771 }
772 log_info(gc)("Using %s", _collectedHeap->name());
773
774 GCArguments::arguments()->post_heap_initialize();
775 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
776
777 #ifdef _LP64
778 if (UseCompressedOops) {
779 // Subtract a page because something can get allocated at heap base.
780 // This also makes implicit null checking work, because the
781 // memory+1 page below heap_base needs to cause a signal.
782 // See needs_explicit_null_check.
783 // Only set the heap base for compressed oops because it indicates
784 // compressed oops for pstack code.
785 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) {
786 // Didn't reserve heap below 4Gb. Must shift.
787 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
788 }
789 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) {
790 // Did reserve heap below 32Gb. Can use base == 0;
791 Universe::set_narrow_oop_base(0);
792 }
793
794 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base());
795
796 LogTarget(Info, gc, heap, coops) lt;
797 if (lt.is_enabled()) {
798 ResourceMark rm;
799 LogStream ls(lt);
800 Universe::print_compressed_oops_mode(&ls);
801 }
802
803 // Tell tests in which mode we run.
804 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode",
805 narrow_oop_mode_to_string(narrow_oop_mode()),
806 false));
807 }
808 // Universe::narrow_oop_base() is one page below the heap.
809 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() -
810 os::vm_page_size()) ||
811 Universe::narrow_oop_base() == NULL, "invalid value");
812 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes ||
813 Universe::narrow_oop_shift() == 0, "invalid value");
814 #endif
815
816 // We will never reach the CATCH below since Exceptions::_throw will cause
817 // the VM to exit if an exception is thrown during initialization
818
819 if (UseTLAB) {
820 assert(Universe::heap()->supports_tlab_allocation(),
821 "Should support thread-local allocation buffers");
822 ThreadLocalAllocBuffer::startup_initialization();
823 }
824 return JNI_OK;
825 }
826
827 void Universe::print_compressed_oops_mode(outputStream* st) {
828 st->print("Heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
829 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M);
830
831 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode()));
832
833 if (Universe::narrow_oop_base() != 0) {
834 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base()));
835 }
836
837 if (Universe::narrow_oop_shift() != 0) {
838 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
839 }
840
841 if (!Universe::narrow_oop_use_implicit_null_checks()) {
842 st->print(", no protected page in front of the heap");
843 }
844 st->cr();
845 }
846
847 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
848
849 assert(alignment <= Arguments::conservative_max_heap_alignment(),
850 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
851 alignment, Arguments::conservative_max_heap_alignment());
852
853 size_t total_reserved = align_up(heap_size, alignment);
854 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
855 "heap size is too big for compressed oops");
856
857 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size());
858 assert(!UseLargePages
859 || UseParallelGC
860 || use_large_pages, "Wrong alignment to use large pages");
861
862 // Now create the space.
863 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt);
864
865 if (total_rs.is_reserved()) {
866 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
867 "must be exactly of required size and alignment");
868 // We are good.
869
870 if (UseCompressedOops) {
871 // Universe::initialize_heap() will reset this to NULL if unscaled
872 // or zero-based narrow oops are actually used.
873 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
874 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
875 }
876
877 if (AllocateHeapAt != NULL) {
878 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
879 }
880 return total_rs;
881 }
882
883 vm_exit_during_initialization(
884 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
885 total_reserved/K));
886
887 // satisfy compiler
888 ShouldNotReachHere();
889 return ReservedHeapSpace(0, 0, false);
890 }
891
892
893 // It's the caller's responsibility to ensure glitch-freedom
894 // (if required).
895 void Universe::update_heap_info_at_gc() {
896 _heap_capacity_at_last_gc = heap()->capacity();
897 _heap_used_at_last_gc = heap()->used();
898 }
899
900
901 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) {
902 switch (mode) {
903 case UnscaledNarrowOop:
904 return "32-bit";
905 case ZeroBasedNarrowOop:
906 return "Zero based";
907 case DisjointBaseNarrowOop:
908 return "Non-zero disjoint base";
909 case HeapBasedNarrowOop:
910 return "Non-zero based";
911 default:
912 ShouldNotReachHere();
913 return "";
914 }
915 }
916
917
918 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() {
919 if (narrow_oop_base_disjoint()) {
920 return DisjointBaseNarrowOop;
921 }
922
923 if (narrow_oop_base() != 0) {
924 return HeapBasedNarrowOop;
925 }
926
927 if (narrow_oop_shift() != 0) {
928 return ZeroBasedNarrowOop;
929 }
930
931 return UnscaledNarrowOop;
932 }
933
934 void initialize_known_method(LatestMethodCache* method_cache,
935 InstanceKlass* ik,
936 const char* method,
937 Symbol* signature,
938 bool is_static, TRAPS)
939 {
940 TempNewSymbol name = SymbolTable::new_symbol(method, CHECK);
941 Method* m = NULL;
942 // The klass must be linked before looking up the method.
943 if (!ik->link_class_or_fail(THREAD) ||
944 ((m = ik->find_method(name, signature)) == NULL) ||
945 is_static != m->is_static()) {
946 ResourceMark rm(THREAD);
947 // NoSuchMethodException doesn't actually work because it tries to run the
948 // <init> function before java_lang_Class is linked. Print error and exit.
949 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
950 ik->name()->as_C_string(), method));
951 }
952 method_cache->init(ik, m);
953 }
954
955 void Universe::initialize_known_methods(TRAPS) {
956 // Set up static method for registering finalizers
957 initialize_known_method(_finalizer_register_cache,
958 SystemDictionary::Finalizer_klass(),
959 "register",
960 vmSymbols::object_void_signature(), true, CHECK);
961
962 initialize_known_method(_throw_illegal_access_error_cache,
963 SystemDictionary::internal_Unsafe_klass(),
964 "throwIllegalAccessError",
965 vmSymbols::void_method_signature(), true, CHECK);
966
967 // Set up method for registering loaded classes in class loader vector
968 initialize_known_method(_loader_addClass_cache,
969 SystemDictionary::ClassLoader_klass(),
970 "addClass",
971 vmSymbols::class_void_signature(), false, CHECK);
972
973 // Set up method for checking protection domain
974 initialize_known_method(_pd_implies_cache,
975 SystemDictionary::ProtectionDomain_klass(),
976 "impliesCreateAccessControlContext",
977 vmSymbols::void_boolean_signature(), false, CHECK);
978
979 // Set up method for stack walking
980 initialize_known_method(_do_stack_walk_cache,
981 SystemDictionary::AbstractStackWalker_klass(),
982 "doStackWalk",
983 vmSymbols::doStackWalk_signature(), false, CHECK);
984 }
985
986 void universe2_init() {
987 EXCEPTION_MARK;
988 Universe::genesis(CATCH);
989 }
990
991 // Set after initialization of the module runtime, call_initModuleRuntime
992 void universe_post_module_init() {
993 Universe::_module_initialized = true;
994 }
995
996 bool universe_post_init() {
997 assert(!is_init_completed(), "Error: initialization not yet completed!");
998 Universe::_fully_initialized = true;
999 EXCEPTION_MARK;
1000 { ResourceMark rm;
1001 Interpreter::initialize(); // needed for interpreter entry points
1002 if (!UseSharedSpaces) {
1003 HandleMark hm(THREAD);
1004 Klass* ok = SystemDictionary::Object_klass();
1005 Universe::reinitialize_vtable_of(ok, CHECK_false);
1006 Universe::reinitialize_itables(CHECK_false);
1007 }
1008 }
1009
1010 HandleMark hm(THREAD);
1011 // Setup preallocated empty java.lang.Class array
1012 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
1013
1014 // Setup preallocated OutOfMemoryError errors
1015 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
1016 InstanceKlass* ik = InstanceKlass::cast(k);
1017 Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false);
1018 Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false);
1019 Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false);
1020 Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false);
1021 Universe::_out_of_memory_error_gc_overhead_limit =
1022 ik->allocate_instance(CHECK_false);
1023 Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false);
1024
1025 // Setup preallocated cause message for delayed StackOverflowError
1026 if (StackReservedPages > 0) {
1027 Universe::_delayed_stack_overflow_error_message =
1028 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
1029 }
1030
1031 // Setup preallocated NullPointerException
1032 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1033 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
1034 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1035 // Setup preallocated ArithmeticException
1036 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1037 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
1038 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1039 // Virtual Machine Error for when we get into a situation we can't resolve
1040 k = SystemDictionary::resolve_or_fail(
1041 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
1042 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1043 if (!linked) {
1044 tty->print_cr("Unable to link/verify VirtualMachineError class");
1045 return false; // initialization failed
1046 }
1047 Universe::_virtual_machine_error_instance =
1048 InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1049
1050 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1051
1052 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
1053 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
1054
1055 msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
1056 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
1057 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
1058 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
1059
1060 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
1061 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
1062
1063 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
1064 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
1065
1066 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false);
1067 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg());
1068
1069 msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1070 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
1071
1072 // Setup the array of errors that have preallocated backtrace
1073 k = Universe::_out_of_memory_error_java_heap->klass();
1074 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
1075 ik = InstanceKlass::cast(k);
1076
1077 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
1078 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false);
1079 for (int i=0; i<len; i++) {
1080 oop err = ik->allocate_instance(CHECK_false);
1081 Handle err_h = Handle(THREAD, err);
1082 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
1083 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
1084 }
1085 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
1086
1087 Universe::initialize_known_methods(CHECK_false);
1088
1089 // This needs to be done before the first scavenge/gc, since
1090 // it's an input to soft ref clearing policy.
1091 {
1092 MutexLocker x(Heap_lock);
1093 Universe::update_heap_info_at_gc();
1094 }
1095
1096 // ("weak") refs processing infrastructure initialization
1097 Universe::heap()->post_initialize();
1098
1099 MemoryService::add_metaspace_memory_pools();
1100
1101 MemoryService::set_universe_heap(Universe::heap());
1102 #if INCLUDE_CDS
1103 SharedClassUtil::initialize(CHECK_false);
1104 #endif
1105 return true;
1106 }
1107
1108
1109 void Universe::compute_base_vtable_size() {
1110 _base_vtable_size = ClassLoader::compute_Object_vtable();
1111 }
1112
1113 void Universe::print_on(outputStream* st) {
1114 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1115 st->print_cr("Heap");
1116 heap()->print_on(st);
1117 }
1118
1119 void Universe::print_heap_at_SIGBREAK() {
1120 if (PrintHeapAtSIGBREAK) {
1121 print_on(tty);
1122 tty->cr();
1123 tty->flush();
1124 }
1125 }
1126
1127 void Universe::print_heap_before_gc() {
1128 LogTarget(Debug, gc, heap) lt;
1129 if (lt.is_enabled()) {
1130 LogStream ls(lt);
1131 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1132 ResourceMark rm;
1133 heap()->print_on(&ls);
1134 }
1135 }
1136
1137 void Universe::print_heap_after_gc() {
1138 LogTarget(Debug, gc, heap) lt;
1139 if (lt.is_enabled()) {
1140 LogStream ls(lt);
1141 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1142 ResourceMark rm;
1143 heap()->print_on(&ls);
1144 }
1145 }
1146
1147 void Universe::initialize_verify_flags() {
1148 verify_flags = 0;
1149 const char delimiter[] = " ,";
1150
1151 size_t length = strlen(VerifySubSet);
1152 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1153 strncpy(subset_list, VerifySubSet, length + 1);
1154
1155 char* token = strtok(subset_list, delimiter);
1156 while (token != NULL) {
1157 if (strcmp(token, "threads") == 0) {
1158 verify_flags |= Verify_Threads;
1159 } else if (strcmp(token, "heap") == 0) {
1160 verify_flags |= Verify_Heap;
1161 } else if (strcmp(token, "symbol_table") == 0) {
1162 verify_flags |= Verify_SymbolTable;
1163 } else if (strcmp(token, "string_table") == 0) {
1164 verify_flags |= Verify_StringTable;
1165 } else if (strcmp(token, "codecache") == 0) {
1166 verify_flags |= Verify_CodeCache;
1167 } else if (strcmp(token, "dictionary") == 0) {
1168 verify_flags |= Verify_SystemDictionary;
1169 } else if (strcmp(token, "classloader_data_graph") == 0) {
1170 verify_flags |= Verify_ClassLoaderDataGraph;
1171 } else if (strcmp(token, "metaspace") == 0) {
1172 verify_flags |= Verify_MetaspaceAux;
1173 } else if (strcmp(token, "jni_handles") == 0) {
1174 verify_flags |= Verify_JNIHandles;
1175 } else if (strcmp(token, "codecache_oops") == 0) {
1176 verify_flags |= Verify_CodeCacheOops;
1177 } else {
1178 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1179 }
1180 token = strtok(NULL, delimiter);
1181 }
1182 FREE_C_HEAP_ARRAY(char, subset_list);
1183 }
1184
1185 bool Universe::should_verify_subset(uint subset) {
1186 if (verify_flags & subset) {
1187 return true;
1188 }
1189 return false;
1190 }
1191
1192 void Universe::verify(VerifyOption option, const char* prefix) {
1193 // The use of _verify_in_progress is a temporary work around for
1194 // 6320749. Don't bother with a creating a class to set and clear
1195 // it since it is only used in this method and the control flow is
1196 // straight forward.
1197 _verify_in_progress = true;
1198
1199 COMPILER2_PRESENT(
1200 assert(!DerivedPointerTable::is_active(),
1201 "DPT should not be active during verification "
1202 "(of thread stacks below)");
1203 )
1204
1205 ResourceMark rm;
1206 HandleMark hm; // Handles created during verification can be zapped
1207 _verify_count++;
1208
1209 FormatBuffer<> title("Verifying %s", prefix);
1210 GCTraceTime(Info, gc, verify) tm(title.buffer());
1211 if (should_verify_subset(Verify_Threads)) {
1212 log_debug(gc, verify)("Threads");
1213 Threads::verify();
1214 }
1215 if (should_verify_subset(Verify_Heap)) {
1216 log_debug(gc, verify)("Heap");
1217 heap()->verify(option);
1218 }
1219 if (should_verify_subset(Verify_SymbolTable)) {
1220 log_debug(gc, verify)("SymbolTable");
1221 SymbolTable::verify();
1222 }
1223 if (should_verify_subset(Verify_StringTable)) {
1224 log_debug(gc, verify)("StringTable");
1225 StringTable::verify();
1226 }
1227 if (should_verify_subset(Verify_CodeCache)) {
1228 {
1229 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1230 log_debug(gc, verify)("CodeCache");
1231 CodeCache::verify();
1232 }
1233 }
1234 if (should_verify_subset(Verify_SystemDictionary)) {
1235 log_debug(gc, verify)("SystemDictionary");
1236 SystemDictionary::verify();
1237 }
1238 #ifndef PRODUCT
1239 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1240 log_debug(gc, verify)("ClassLoaderDataGraph");
1241 ClassLoaderDataGraph::verify();
1242 }
1243 #endif
1244 if (should_verify_subset(Verify_MetaspaceAux)) {
1245 log_debug(gc, verify)("MetaspaceAux");
1246 MetaspaceAux::verify_free_chunks();
1247 }
1248 if (should_verify_subset(Verify_JNIHandles)) {
1249 log_debug(gc, verify)("JNIHandles");
1250 JNIHandles::verify();
1251 }
1252 if (should_verify_subset(Verify_CodeCacheOops)) {
1253 log_debug(gc, verify)("CodeCache Oops");
1254 CodeCache::verify_oops();
1255 }
1256
1257 _verify_in_progress = false;
1258 }
1259
1260
1261 #ifndef PRODUCT
1262 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1263 assert(low_boundary < high_boundary, "bad interval");
1264
1265 // decide which low-order bits we require to be clear:
1266 size_t alignSize = MinObjAlignmentInBytes;
1267 size_t min_object_size = CollectedHeap::min_fill_size();
1268
1269 // make an inclusive limit:
1270 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1271 uintptr_t min = (uintptr_t)low_boundary;
1272 assert(min < max, "bad interval");
1273 uintptr_t diff = max ^ min;
1274
1275 // throw away enough low-order bits to make the diff vanish
1276 uintptr_t mask = (uintptr_t)(-1);
1277 while ((mask & diff) != 0)
1278 mask <<= 1;
1279 uintptr_t bits = (min & mask);
1280 assert(bits == (max & mask), "correct mask");
1281 // check an intermediate value between min and max, just to make sure:
1282 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1283
1284 // require address alignment, too:
1285 mask |= (alignSize - 1);
1286
1287 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1288 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1289 }
1290 _verify_oop_mask = mask;
1291 _verify_oop_bits = bits;
1292 }
1293
1294 // Oop verification (see MacroAssembler::verify_oop)
1295
1296 uintptr_t Universe::verify_oop_mask() {
1297 MemRegion m = heap()->reserved_region();
1298 calculate_verify_data(m.start(), m.end());
1299 return _verify_oop_mask;
1300 }
1301
1302 uintptr_t Universe::verify_oop_bits() {
1303 MemRegion m = heap()->reserved_region();
1304 calculate_verify_data(m.start(), m.end());
1305 return _verify_oop_bits;
1306 }
1307
1308 uintptr_t Universe::verify_mark_mask() {
1309 return markOopDesc::lock_mask_in_place;
1310 }
1311
1312 uintptr_t Universe::verify_mark_bits() {
1313 intptr_t mask = verify_mark_mask();
1314 intptr_t bits = (intptr_t)markOopDesc::prototype();
1315 assert((bits & ~mask) == 0, "no stray header bits");
1316 return bits;
1317 }
1318 #endif // PRODUCT
1319
1320
1321 void Universe::compute_verify_oop_data() {
1322 verify_oop_mask();
1323 verify_oop_bits();
1324 verify_mark_mask();
1325 verify_mark_bits();
1326 }
1327
1328
1329 void LatestMethodCache::init(Klass* k, Method* m) {
1330 if (!UseSharedSpaces) {
1331 _klass = k;
1332 }
1333 #ifndef PRODUCT
1334 else {
1335 // sharing initilization should have already set up _klass
1336 assert(_klass != NULL, "just checking");
1337 }
1338 #endif
1339
1340 _method_idnum = m->method_idnum();
1341 assert(_method_idnum >= 0, "sanity check");
1342 }
1343
1344
1345 Method* LatestMethodCache::get_method() {
1346 if (klass() == NULL) return NULL;
1347 InstanceKlass* ik = InstanceKlass::cast(klass());
1348 Method* m = ik->method_with_idnum(method_idnum());
1349 assert(m != NULL, "sanity check");
1350 return m;
1351 }
1352
1353
1354 #ifdef ASSERT
1355 // Release dummy object(s) at bottom of heap
1356 bool Universe::release_fullgc_alot_dummy() {
1357 MutexLocker ml(FullGCALot_lock);
1358 if (_fullgc_alot_dummy_array != NULL) {
1359 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
1360 // No more dummies to release, release entire array instead
1361 _fullgc_alot_dummy_array = NULL;
1362 return false;
1363 }
1364 if (!UseConcMarkSweepGC) {
1365 // Release dummy at bottom of old generation
1366 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1367 }
1368 // Release dummy at bottom of permanent generation
1369 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1370 }
1371 return true;
1372 }
1373
1374 #endif // ASSERT