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/gcLocker.inline.hpp"
38 #include "gc/shared/genCollectedHeap.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/metaspaceShared.hpp"
48 #include "memory/oopFactory.hpp"
49 #include "memory/resourceArea.hpp"
50 #include "memory/universe.hpp"
51 #include "memory/universe.inline.hpp"
52 #include "oops/constantPool.hpp"
53 #include "oops/instanceClassLoaderKlass.hpp"
54 #include "oops/instanceKlass.hpp"
55 #include "oops/instanceMirrorKlass.hpp"
56 #include "oops/instanceRefKlass.hpp"
57 #include "oops/objArrayOop.inline.hpp"
58 #include "oops/oop.inline.hpp"
59 #include "oops/typeArrayKlass.hpp"
60 #include "prims/resolvedMethodTable.hpp"
61 #include "runtime/arguments.hpp"
62 #include "runtime/atomic.hpp"
63 #include "runtime/commandLineFlagConstraintList.hpp"
64 #include "runtime/deoptimization.hpp"
65 #include "runtime/fprofiler.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/copy.hpp"
77 #include "utilities/events.hpp"
78 #include "utilities/hashtable.inline.hpp"
79 #include "utilities/macros.hpp"
80 #include "utilities/ostream.hpp"
81 #include "utilities/preserveException.hpp"
82 #if INCLUDE_ALL_GCS
83 #include "gc/cms/cmsCollectorPolicy.hpp"
84 #include "gc/g1/g1CollectedHeap.inline.hpp"
85 #include "gc/g1/g1CollectorPolicy.hpp"
86 #include "gc/parallel/parallelScavengeHeap.hpp"
87 #include "gc/shared/adaptiveSizePolicy.hpp"
88 #endif // INCLUDE_ALL_GCS
89 #if INCLUDE_CDS
90 #include "classfile/sharedClassUtil.hpp"
91 #endif
92
93 // Known objects
94 Klass* Universe::_boolArrayKlassObj = NULL;
95 Klass* Universe::_byteArrayKlassObj = NULL;
96 Klass* Universe::_charArrayKlassObj = NULL;
97 Klass* Universe::_intArrayKlassObj = NULL;
98 Klass* Universe::_shortArrayKlassObj = NULL;
99 Klass* Universe::_longArrayKlassObj = NULL;
100 Klass* Universe::_singleArrayKlassObj = NULL;
101 Klass* Universe::_doubleArrayKlassObj = NULL;
102 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ };
103 Klass* Universe::_objectArrayKlassObj = NULL;
104 oop Universe::_int_mirror = NULL;
105 oop Universe::_float_mirror = NULL;
106 oop Universe::_double_mirror = NULL;
107 oop Universe::_byte_mirror = NULL;
108 oop Universe::_bool_mirror = NULL;
109 oop Universe::_char_mirror = NULL;
110 oop Universe::_long_mirror = NULL;
111 oop Universe::_short_mirror = NULL;
112 oop Universe::_void_mirror = NULL;
113 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ };
114 oop Universe::_main_thread_group = NULL;
115 oop Universe::_system_thread_group = NULL;
116 objArrayOop Universe::_the_empty_class_klass_array = NULL;
117 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
118 oop Universe::_the_null_string = NULL;
119 oop Universe::_the_min_jint_string = NULL;
120 LatestMethodCache* Universe::_finalizer_register_cache = NULL;
121 LatestMethodCache* Universe::_loader_addClass_cache = NULL;
122 LatestMethodCache* Universe::_pd_implies_cache = NULL;
123 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL;
124 LatestMethodCache* Universe::_do_stack_walk_cache = NULL;
125 oop Universe::_out_of_memory_error_java_heap = NULL;
126 oop Universe::_out_of_memory_error_metaspace = NULL;
127 oop Universe::_out_of_memory_error_class_metaspace = NULL;
128 oop Universe::_out_of_memory_error_array_size = NULL;
129 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL;
130 oop Universe::_out_of_memory_error_realloc_objects = NULL;
131 oop Universe::_delayed_stack_overflow_error_message = NULL;
132 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL;
133 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
134 bool Universe::_verify_in_progress = false;
135 long Universe::verify_flags = Universe::Verify_All;
136 oop Universe::_null_ptr_exception_instance = NULL;
137 oop Universe::_arithmetic_exception_instance = NULL;
138 oop Universe::_virtual_machine_error_instance = NULL;
139 oop Universe::_vm_exception = NULL;
140 oop Universe::_allocation_context_notification_obj = NULL;
141 oop Universe::_reference_pending_list = NULL;
142
143 Array<int>* Universe::_the_empty_int_array = NULL;
144 Array<u2>* Universe::_the_empty_short_array = NULL;
145 Array<Klass*>* Universe::_the_empty_klass_array = NULL;
146 Array<Method*>* Universe::_the_empty_method_array = NULL;
147
148 // These variables are guarded by FullGCALot_lock.
149 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;)
150 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
151
152 // Heap
153 int Universe::_verify_count = 0;
154
155 // Oop verification (see MacroAssembler::verify_oop)
156 uintptr_t Universe::_verify_oop_mask = 0;
157 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
158
159 int Universe::_base_vtable_size = 0;
160 bool Universe::_bootstrapping = false;
161 bool Universe::_module_initialized = false;
162 bool Universe::_fully_initialized = false;
163
164 size_t Universe::_heap_capacity_at_last_gc;
165 size_t Universe::_heap_used_at_last_gc = 0;
166
167 CollectedHeap* Universe::_collectedHeap = NULL;
168
169 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true };
170 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true };
171 address Universe::_narrow_ptrs_base;
172
173 void Universe::basic_type_classes_do(void f(Klass*)) {
174 f(boolArrayKlassObj());
175 f(byteArrayKlassObj());
176 f(charArrayKlassObj());
177 f(intArrayKlassObj());
178 f(shortArrayKlassObj());
179 f(longArrayKlassObj());
180 f(singleArrayKlassObj());
181 f(doubleArrayKlassObj());
182 }
183
184 void Universe::oops_do(OopClosure* f, bool do_all) {
185
186 f->do_oop((oop*) &_int_mirror);
187 f->do_oop((oop*) &_float_mirror);
188 f->do_oop((oop*) &_double_mirror);
189 f->do_oop((oop*) &_byte_mirror);
190 f->do_oop((oop*) &_bool_mirror);
191 f->do_oop((oop*) &_char_mirror);
192 f->do_oop((oop*) &_long_mirror);
193 f->do_oop((oop*) &_short_mirror);
194 f->do_oop((oop*) &_void_mirror);
195
196 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
197 f->do_oop((oop*) &_mirrors[i]);
198 }
199 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
200
201 f->do_oop((oop*)&_the_empty_class_klass_array);
202 f->do_oop((oop*)&_the_null_string);
203 f->do_oop((oop*)&_the_min_jint_string);
204 f->do_oop((oop*)&_out_of_memory_error_java_heap);
205 f->do_oop((oop*)&_out_of_memory_error_metaspace);
206 f->do_oop((oop*)&_out_of_memory_error_class_metaspace);
207 f->do_oop((oop*)&_out_of_memory_error_array_size);
208 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit);
209 f->do_oop((oop*)&_out_of_memory_error_realloc_objects);
210 f->do_oop((oop*)&_delayed_stack_overflow_error_message);
211 f->do_oop((oop*)&_preallocated_out_of_memory_error_array);
212 f->do_oop((oop*)&_null_ptr_exception_instance);
213 f->do_oop((oop*)&_arithmetic_exception_instance);
214 f->do_oop((oop*)&_virtual_machine_error_instance);
215 f->do_oop((oop*)&_main_thread_group);
216 f->do_oop((oop*)&_system_thread_group);
217 f->do_oop((oop*)&_vm_exception);
218 f->do_oop((oop*)&_allocation_context_notification_obj);
219 f->do_oop((oop*)&_reference_pending_list);
220 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);)
221 }
222
223 // Serialize metadata in and out of CDS archive, not oops.
224 void Universe::serialize(SerializeClosure* f, bool do_all) {
225
226 f->do_ptr((void**)&_boolArrayKlassObj);
227 f->do_ptr((void**)&_byteArrayKlassObj);
228 f->do_ptr((void**)&_charArrayKlassObj);
229 f->do_ptr((void**)&_intArrayKlassObj);
230 f->do_ptr((void**)&_shortArrayKlassObj);
231 f->do_ptr((void**)&_longArrayKlassObj);
232 f->do_ptr((void**)&_singleArrayKlassObj);
233 f->do_ptr((void**)&_doubleArrayKlassObj);
234 f->do_ptr((void**)&_objectArrayKlassObj);
235
236 {
237 for (int i = 0; i < T_VOID+1; i++) {
238 if (_typeArrayKlassObjs[i] != NULL) {
239 assert(i >= T_BOOLEAN, "checking");
240 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
241 } else if (do_all) {
242 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
243 }
244 }
245 }
246
247 f->do_ptr((void**)&_the_array_interfaces_array);
248 f->do_ptr((void**)&_the_empty_int_array);
249 f->do_ptr((void**)&_the_empty_short_array);
250 f->do_ptr((void**)&_the_empty_method_array);
251 f->do_ptr((void**)&_the_empty_klass_array);
252 _finalizer_register_cache->serialize(f);
253 _loader_addClass_cache->serialize(f);
254 _pd_implies_cache->serialize(f);
255 _throw_illegal_access_error_cache->serialize(f);
256 _do_stack_walk_cache->serialize(f);
257 }
258
259 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
260 if (size < alignment || size % alignment != 0) {
261 vm_exit_during_initialization(
262 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
263 }
264 }
265
266 void initialize_basic_type_klass(Klass* k, TRAPS) {
267 Klass* ok = SystemDictionary::Object_klass();
268 if (UseSharedSpaces) {
269 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
270 assert(k->super() == ok, "u3");
271 k->restore_unshareable_info(loader_data, Handle(), CHECK);
272 } else {
273 k->initialize_supers(ok, CHECK);
274 }
275 k->append_to_sibling_list();
276 }
277
278 void Universe::genesis(TRAPS) {
279 ResourceMark rm;
280
281 { FlagSetting fs(_bootstrapping, true);
282
283 { MutexLocker mc(Compile_lock);
284
285 // determine base vtable size; without that we cannot create the array klasses
286 compute_base_vtable_size();
287
288 if (!UseSharedSpaces) {
289 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK);
290 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK);
291 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK);
292 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK);
293 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK);
294 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK);
295 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK);
296 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK);
297
298 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj;
299 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj;
300 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj;
301 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj;
302 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj;
303 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj;
304 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj;
305 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj;
306
307 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
308
309 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
310 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
311 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
312 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
313 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
314 }
315 }
316
317 vmSymbols::initialize(CHECK);
318
319 SystemDictionary::initialize(CHECK);
320
321 Klass* ok = SystemDictionary::Object_klass();
322
323 _the_null_string = StringTable::intern("null", CHECK);
324 _the_min_jint_string = StringTable::intern("-2147483648", CHECK);
325
326 if (UseSharedSpaces) {
327 // Verify shared interfaces array.
328 assert(_the_array_interfaces_array->at(0) ==
329 SystemDictionary::Cloneable_klass(), "u3");
330 assert(_the_array_interfaces_array->at(1) ==
331 SystemDictionary::Serializable_klass(), "u3");
332 MetaspaceShared::fixup_shared_string_regions();
333 } else {
334 // Set up shared interfaces array. (Do this before supers are set up.)
335 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
336 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
337 }
338
339 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
340 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
341 initialize_basic_type_klass(singleArrayKlassObj(), CHECK);
342 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
343 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
344 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
345 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
346 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
347 } // end of core bootstrapping
348
349 // Maybe this could be lifted up now that object array can be initialized
350 // during the bootstrapping.
351
352 // OLD
353 // Initialize _objectArrayKlass after core bootstraping to make
354 // sure the super class is set up properly for _objectArrayKlass.
355 // ---
356 // NEW
357 // Since some of the old system object arrays have been converted to
358 // ordinary object arrays, _objectArrayKlass will be loaded when
359 // SystemDictionary::initialize(CHECK); is run. See the extra check
360 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
361 _objectArrayKlassObj = InstanceKlass::
362 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
363 // OLD
364 // Add the class to the class hierarchy manually to make sure that
365 // its vtable is initialized after core bootstrapping is completed.
366 // ---
367 // New
368 // Have already been initialized.
369 _objectArrayKlassObj->append_to_sibling_list();
370
371 #ifdef ASSERT
372 if (FullGCALot) {
373 // Allocate an array of dummy objects.
374 // We'd like these to be at the bottom of the old generation,
375 // so that when we free one and then collect,
376 // (almost) the whole heap moves
377 // and we find out if we actually update all the oops correctly.
378 // But we can't allocate directly in the old generation,
379 // so we allocate wherever, and hope that the first collection
380 // moves these objects to the bottom of the old generation.
381 // We can allocate directly in the permanent generation, so we do.
382 int size;
383 if (UseConcMarkSweepGC) {
384 log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate");
385 size = FullGCALotDummies;
386 } else {
387 size = FullGCALotDummies * 2;
388 }
389 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
390 objArrayHandle dummy_array(THREAD, naked_array);
391 int i = 0;
392 while (i < size) {
393 // Allocate dummy in old generation
394 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK);
395 dummy_array->obj_at_put(i++, dummy);
396 }
397 {
398 // Only modify the global variable inside the mutex.
399 // If we had a race to here, the other dummy_array instances
400 // and their elements just get dropped on the floor, which is fine.
401 MutexLocker ml(FullGCALot_lock);
402 if (_fullgc_alot_dummy_array == NULL) {
403 _fullgc_alot_dummy_array = dummy_array();
404 }
405 }
406 assert(i == _fullgc_alot_dummy_array->length(), "just checking");
407 }
408 #endif
409
410 // Initialize dependency array for null class loader
411 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK);
412
413 }
414
415 void Universe::initialize_basic_type_mirrors(TRAPS) {
416 assert(_int_mirror==NULL, "basic type mirrors already initialized");
417 _int_mirror =
418 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK);
419 _float_mirror =
420 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK);
421 _double_mirror =
422 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK);
423 _byte_mirror =
424 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK);
425 _bool_mirror =
426 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
427 _char_mirror =
428 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK);
429 _long_mirror =
430 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK);
431 _short_mirror =
432 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK);
433 _void_mirror =
434 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK);
435
436 _mirrors[T_INT] = _int_mirror;
437 _mirrors[T_FLOAT] = _float_mirror;
438 _mirrors[T_DOUBLE] = _double_mirror;
439 _mirrors[T_BYTE] = _byte_mirror;
440 _mirrors[T_BOOLEAN] = _bool_mirror;
441 _mirrors[T_CHAR] = _char_mirror;
442 _mirrors[T_LONG] = _long_mirror;
443 _mirrors[T_SHORT] = _short_mirror;
444 _mirrors[T_VOID] = _void_mirror;
445 //_mirrors[T_OBJECT] = _object_klass->java_mirror();
446 //_mirrors[T_ARRAY] = _object_klass->java_mirror();
447 }
448
449 void Universe::fixup_mirrors(TRAPS) {
450 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
451 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
452 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
453 // that the number of objects allocated at this point is very small.
454 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
455 HandleMark hm(THREAD);
456 // Cache the start of the static fields
457 InstanceMirrorKlass::init_offset_of_static_fields();
458
459 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
460 int list_length = list->length();
461 for (int i = 0; i < list_length; i++) {
462 Klass* k = list->at(i);
463 assert(k->is_klass(), "List should only hold classes");
464 EXCEPTION_MARK;
465 java_lang_Class::fixup_mirror(k, CATCH);
466 }
467 delete java_lang_Class::fixup_mirror_list();
468 java_lang_Class::set_fixup_mirror_list(NULL);
469 }
470
471 #define assert_pll_locked(test) \
472 assert(Heap_lock->test(), "Reference pending list access requires lock")
473
474 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
475
476 oop Universe::reference_pending_list() {
477 assert_pll_ownership();
478 return _reference_pending_list;
479 }
480
481 void Universe::set_reference_pending_list(oop list) {
482 assert_pll_ownership();
483 _reference_pending_list = list;
484 }
485
486 bool Universe::has_reference_pending_list() {
487 assert_pll_ownership();
488 return _reference_pending_list != NULL;
489 }
490
491 oop Universe::swap_reference_pending_list(oop list) {
492 assert_pll_locked(is_locked);
493 return (oop)Atomic::xchg_ptr(list, &_reference_pending_list);
494 }
495
496 #undef assert_pll_locked
497 #undef assert_pll_ownership
498
499
500 static bool has_run_finalizers_on_exit = false;
501
502 void Universe::run_finalizers_on_exit() {
503 if (has_run_finalizers_on_exit) return;
504 has_run_finalizers_on_exit = true;
505
506 // Called on VM exit. This ought to be run in a separate thread.
507 log_trace(ref)("Callback to run finalizers on exit");
508 {
509 PRESERVE_EXCEPTION_MARK;
510 Klass* finalizer_klass = SystemDictionary::Finalizer_klass();
511 JavaValue result(T_VOID);
512 JavaCalls::call_static(
513 &result,
514 finalizer_klass,
515 vmSymbols::run_finalizers_on_exit_name(),
516 vmSymbols::void_method_signature(),
517 THREAD
518 );
519 // Ignore any pending exceptions
520 CLEAR_PENDING_EXCEPTION;
521 }
522 }
523
524
525 // initialize_vtable could cause gc if
526 // 1) we specified true to initialize_vtable and
527 // 2) this ran after gc was enabled
528 // In case those ever change we use handles for oops
529 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) {
530 // init vtable of k and all subclasses
531 ko->vtable().initialize_vtable(false, CHECK);
532 if (ko->is_instance_klass()) {
533 for (Klass* sk = ko->subklass();
534 sk != NULL;
535 sk = sk->next_sibling()) {
536 reinitialize_vtable_of(sk, CHECK);
537 }
538 }
539 }
540
541
542 void initialize_itable_for_klass(Klass* k, TRAPS) {
543 InstanceKlass::cast(k)->itable().initialize_itable(false, CHECK);
544 }
545
546
547 void Universe::reinitialize_itables(TRAPS) {
548 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK);
549
550 }
551
552
553 bool Universe::on_page_boundary(void* addr) {
554 return ((uintptr_t) addr) % os::vm_page_size() == 0;
555 }
556
557
558 bool Universe::should_fill_in_stack_trace(Handle throwable) {
559 // never attempt to fill in the stack trace of preallocated errors that do not have
560 // backtrace. These errors are kept alive forever and may be "re-used" when all
561 // preallocated errors with backtrace have been consumed. Also need to avoid
562 // a potential loop which could happen if an out of memory occurs when attempting
563 // to allocate the backtrace.
564 return ((throwable() != Universe::_out_of_memory_error_java_heap) &&
565 (throwable() != Universe::_out_of_memory_error_metaspace) &&
566 (throwable() != Universe::_out_of_memory_error_class_metaspace) &&
567 (throwable() != Universe::_out_of_memory_error_array_size) &&
568 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) &&
569 (throwable() != Universe::_out_of_memory_error_realloc_objects));
570 }
571
572
573 oop Universe::gen_out_of_memory_error(oop default_err) {
574 // generate an out of memory error:
575 // - if there is a preallocated error and stack traces are available
576 // (j.l.Throwable is initialized), then return the preallocated
577 // error with a filled in stack trace, and with the message
578 // provided by the default error.
579 // - otherwise, return the default error, without a stack trace.
580 int next;
581 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
582 SystemDictionary::Throwable_klass()->is_initialized()) {
583 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);
584 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
585 } else {
586 next = -1;
587 }
588 if (next < 0) {
589 // all preallocated errors have been used.
590 // return default
591 return default_err;
592 } else {
593 Thread* THREAD = Thread::current();
594 Handle default_err_h(THREAD, default_err);
595 // get the error object at the slot and set set it to NULL so that the
596 // array isn't keeping it alive anymore.
597 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next));
598 assert(exc() != NULL, "slot has been used already");
599 preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
600
601 // use the message from the default error
602 oop msg = java_lang_Throwable::message(default_err_h());
603 assert(msg != NULL, "no message");
604 java_lang_Throwable::set_message(exc(), msg);
605
606 // populate the stack trace and return it.
607 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
608 return exc();
609 }
610 }
611
612 intptr_t Universe::_non_oop_bits = 0;
613
614 void* Universe::non_oop_word() {
615 // Neither the high bits nor the low bits of this value is allowed
616 // to look like (respectively) the high or low bits of a real oop.
617 //
618 // High and low are CPU-specific notions, but low always includes
619 // the low-order bit. Since oops are always aligned at least mod 4,
620 // setting the low-order bit will ensure that the low half of the
621 // word will never look like that of a real oop.
622 //
623 // Using the OS-supplied non-memory-address word (usually 0 or -1)
624 // will take care of the high bits, however many there are.
625
626 if (_non_oop_bits == 0) {
627 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
628 }
629
630 return (void*)_non_oop_bits;
631 }
632
633 jint universe_init() {
634 assert(!Universe::_fully_initialized, "called after initialize_vtables");
635 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
636 "LogHeapWordSize is incorrect.");
637 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
638 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
639 "oop size is not not a multiple of HeapWord size");
640
641 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
642
643 JavaClasses::compute_hard_coded_offsets();
644
645 jint status = Universe::initialize_heap();
646 if (status != JNI_OK) {
647 return status;
648 }
649
650 Metaspace::global_initialize();
651
652 AOTLoader::universe_init();
653
654 // Checks 'AfterMemoryInit' constraints.
655 if (!CommandLineFlagConstraintList::check_constraints(CommandLineFlagConstraint::AfterMemoryInit)) {
656 return JNI_EINVAL;
657 }
658
659 // Create memory for metadata. Must be after initializing heap for
660 // DumpSharedSpaces.
661 ClassLoaderData::init_null_class_loader_data();
662
663 // We have a heap so create the Method* caches before
664 // Metaspace::initialize_shared_spaces() tries to populate them.
665 Universe::_finalizer_register_cache = new LatestMethodCache();
666 Universe::_loader_addClass_cache = new LatestMethodCache();
667 Universe::_pd_implies_cache = new LatestMethodCache();
668 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
669 Universe::_do_stack_walk_cache = new LatestMethodCache();
670
671 if (UseSharedSpaces) {
672 // Read the data structures supporting the shared spaces (shared
673 // system dictionary, symbol table, etc.). After that, access to
674 // the file (other than the mapped regions) is no longer needed, and
675 // the file is closed. Closing the file does not affect the
676 // currently mapped regions.
677 MetaspaceShared::initialize_shared_spaces();
678 StringTable::create_table();
679 } else {
680 SymbolTable::create_table();
681 StringTable::create_table();
682
683 if (DumpSharedSpaces) {
684 MetaspaceShared::prepare_for_dumping();
685 }
686 }
687 if (strlen(VerifySubSet) > 0) {
688 Universe::initialize_verify_flags();
689 }
690
691 ResolvedMethodTable::create_table();
692
693 return JNI_OK;
694 }
695
696 CollectedHeap* Universe::create_heap() {
697 assert(_collectedHeap == NULL, "Heap already created");
698 #if !INCLUDE_ALL_GCS
699 if (UseParallelGC) {
700 fatal("UseParallelGC not supported in this VM.");
701 } else if (UseG1GC) {
702 fatal("UseG1GC not supported in this VM.");
703 } else if (UseConcMarkSweepGC) {
704 fatal("UseConcMarkSweepGC not supported in this VM.");
705 #else
706 if (UseParallelGC) {
707 return Universe::create_heap_with_policy<ParallelScavengeHeap, GenerationSizer>();
708 } else if (UseG1GC) {
709 return Universe::create_heap_with_policy<G1CollectedHeap, G1CollectorPolicy>();
710 } else if (UseConcMarkSweepGC) {
711 return Universe::create_heap_with_policy<GenCollectedHeap, ConcurrentMarkSweepPolicy>();
712 #endif
713 } else if (UseSerialGC) {
714 return Universe::create_heap_with_policy<GenCollectedHeap, MarkSweepPolicy>();
715 }
716
717 ShouldNotReachHere();
718 return NULL;
719 }
720
721 // Choose the heap base address and oop encoding mode
722 // when compressed oops are used:
723 // Unscaled - Use 32-bits oops without encoding when
724 // NarrowOopHeapBaseMin + heap_size < 4Gb
725 // ZeroBased - Use zero based compressed oops with encoding when
726 // NarrowOopHeapBaseMin + heap_size < 32Gb
727 // HeapBased - Use compressed oops with heap base + encoding.
728
729 jint Universe::initialize_heap() {
730 jint status = JNI_ERR;
731
732 _collectedHeap = create_heap_ext();
733 if (_collectedHeap == NULL) {
734 _collectedHeap = create_heap();
735 }
736
737 status = _collectedHeap->initialize();
738 if (status != JNI_OK) {
739 return status;
740 }
741 log_info(gc)("Using %s", _collectedHeap->name());
742
743 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
744
745 #ifdef _LP64
746 if (UseCompressedOops) {
747 // Subtract a page because something can get allocated at heap base.
748 // This also makes implicit null checking work, because the
749 // memory+1 page below heap_base needs to cause a signal.
750 // See needs_explicit_null_check.
751 // Only set the heap base for compressed oops because it indicates
752 // compressed oops for pstack code.
753 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) {
754 // Didn't reserve heap below 4Gb. Must shift.
755 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
756 }
757 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) {
758 // Did reserve heap below 32Gb. Can use base == 0;
759 Universe::set_narrow_oop_base(0);
760 }
761
762 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base());
763
764 LogTarget(Info, gc, heap, coops) lt;
765 if (lt.is_enabled()) {
766 ResourceMark rm;
767 LogStream ls(lt);
768 Universe::print_compressed_oops_mode(&ls);
769 }
770
771 // Tell tests in which mode we run.
772 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode",
773 narrow_oop_mode_to_string(narrow_oop_mode()),
774 false));
775 }
776 // Universe::narrow_oop_base() is one page below the heap.
777 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() -
778 os::vm_page_size()) ||
779 Universe::narrow_oop_base() == NULL, "invalid value");
780 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes ||
781 Universe::narrow_oop_shift() == 0, "invalid value");
782 #endif
783
784 // We will never reach the CATCH below since Exceptions::_throw will cause
785 // the VM to exit if an exception is thrown during initialization
786
787 if (UseTLAB) {
788 assert(Universe::heap()->supports_tlab_allocation(),
789 "Should support thread-local allocation buffers");
790 ThreadLocalAllocBuffer::startup_initialization();
791 }
792 return JNI_OK;
793 }
794
795 void Universe::print_compressed_oops_mode(outputStream* st) {
796 st->print("Heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
797 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M);
798
799 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode()));
800
801 if (Universe::narrow_oop_base() != 0) {
802 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base()));
803 }
804
805 if (Universe::narrow_oop_shift() != 0) {
806 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
807 }
808
809 if (!Universe::narrow_oop_use_implicit_null_checks()) {
810 st->print(", no protected page in front of the heap");
811 }
812 st->cr();
813 }
814
815 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
816
817 assert(alignment <= Arguments::conservative_max_heap_alignment(),
818 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
819 alignment, Arguments::conservative_max_heap_alignment());
820
821 size_t total_reserved = align_size_up(heap_size, alignment);
822 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
823 "heap size is too big for compressed oops");
824
825 bool use_large_pages = UseLargePages && is_size_aligned(alignment, os::large_page_size());
826 assert(!UseLargePages
827 || UseParallelGC
828 || use_large_pages, "Wrong alignment to use large pages");
829
830 // Now create the space.
831 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages);
832
833 if (total_rs.is_reserved()) {
834 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
835 "must be exactly of required size and alignment");
836 // We are good.
837
838 if (UseCompressedOops) {
839 // Universe::initialize_heap() will reset this to NULL if unscaled
840 // or zero-based narrow oops are actually used.
841 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
842 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
843 }
844
845 return total_rs;
846 }
847
848 vm_exit_during_initialization(
849 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
850 total_reserved/K));
851
852 // satisfy compiler
853 ShouldNotReachHere();
854 return ReservedHeapSpace(0, 0, false);
855 }
856
857
858 // It's the caller's responsibility to ensure glitch-freedom
859 // (if required).
860 void Universe::update_heap_info_at_gc() {
861 _heap_capacity_at_last_gc = heap()->capacity();
862 _heap_used_at_last_gc = heap()->used();
863 }
864
865
866 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) {
867 switch (mode) {
868 case UnscaledNarrowOop:
869 return "32-bit";
870 case ZeroBasedNarrowOop:
871 return "Zero based";
872 case DisjointBaseNarrowOop:
873 return "Non-zero disjoint base";
874 case HeapBasedNarrowOop:
875 return "Non-zero based";
876 }
877
878 ShouldNotReachHere();
879 return "";
880 }
881
882
883 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() {
884 if (narrow_oop_base_disjoint()) {
885 return DisjointBaseNarrowOop;
886 }
887
888 if (narrow_oop_base() != 0) {
889 return HeapBasedNarrowOop;
890 }
891
892 if (narrow_oop_shift() != 0) {
893 return ZeroBasedNarrowOop;
894 }
895
896 return UnscaledNarrowOop;
897 }
898
899 void initialize_known_method(LatestMethodCache* method_cache,
900 InstanceKlass* ik,
901 const char* method,
902 Symbol* signature,
903 bool is_static, TRAPS)
904 {
905 TempNewSymbol name = SymbolTable::new_symbol(method, CHECK);
906 Method* m = NULL;
907 // The klass must be linked before looking up the method.
908 if (!ik->link_class_or_fail(THREAD) ||
909 ((m = ik->find_method(name, signature)) == NULL) ||
910 is_static != m->is_static()) {
911 ResourceMark rm(THREAD);
912 // NoSuchMethodException doesn't actually work because it tries to run the
913 // <init> function before java_lang_Class is linked. Print error and exit.
914 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
915 ik->name()->as_C_string(), method));
916 }
917 method_cache->init(ik, m);
918 }
919
920 void Universe::initialize_known_methods(TRAPS) {
921 // Set up static method for registering finalizers
922 initialize_known_method(_finalizer_register_cache,
923 SystemDictionary::Finalizer_klass(),
924 "register",
925 vmSymbols::object_void_signature(), true, CHECK);
926
927 initialize_known_method(_throw_illegal_access_error_cache,
928 SystemDictionary::internal_Unsafe_klass(),
929 "throwIllegalAccessError",
930 vmSymbols::void_method_signature(), true, CHECK);
931
932 // Set up method for registering loaded classes in class loader vector
933 initialize_known_method(_loader_addClass_cache,
934 SystemDictionary::ClassLoader_klass(),
935 "addClass",
936 vmSymbols::class_void_signature(), false, CHECK);
937
938 // Set up method for checking protection domain
939 initialize_known_method(_pd_implies_cache,
940 SystemDictionary::ProtectionDomain_klass(),
941 "impliesCreateAccessControlContext",
942 vmSymbols::void_boolean_signature(), false, CHECK);
943
944 // Set up method for stack walking
945 initialize_known_method(_do_stack_walk_cache,
946 SystemDictionary::AbstractStackWalker_klass(),
947 "doStackWalk",
948 vmSymbols::doStackWalk_signature(), false, CHECK);
949 }
950
951 void universe2_init() {
952 EXCEPTION_MARK;
953 Universe::genesis(CATCH);
954 }
955
956 // Set after initialization of the module runtime, call_initModuleRuntime
957 void universe_post_module_init() {
958 Universe::_module_initialized = true;
959 }
960
961 bool universe_post_init() {
962 assert(!is_init_completed(), "Error: initialization not yet completed!");
963 Universe::_fully_initialized = true;
964 EXCEPTION_MARK;
965 { ResourceMark rm;
966 Interpreter::initialize(); // needed for interpreter entry points
967 if (!UseSharedSpaces) {
968 HandleMark hm(THREAD);
969 Klass* ok = SystemDictionary::Object_klass();
970 Universe::reinitialize_vtable_of(ok, CHECK_false);
971 Universe::reinitialize_itables(CHECK_false);
972 }
973 }
974
975 HandleMark hm(THREAD);
976 // Setup preallocated empty java.lang.Class array
977 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
978
979 // Setup preallocated OutOfMemoryError errors
980 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
981 InstanceKlass* ik = InstanceKlass::cast(k);
982 Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false);
983 Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false);
984 Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false);
985 Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false);
986 Universe::_out_of_memory_error_gc_overhead_limit =
987 ik->allocate_instance(CHECK_false);
988 Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false);
989
990 // Setup preallocated cause message for delayed StackOverflowError
991 if (StackReservedPages > 0) {
992 Universe::_delayed_stack_overflow_error_message =
993 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
994 }
995
996 // Setup preallocated NullPointerException
997 // (this is currently used for a cheap & dirty solution in compiler exception handling)
998 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
999 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1000 // Setup preallocated ArithmeticException
1001 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1002 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
1003 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1004 // Virtual Machine Error for when we get into a situation we can't resolve
1005 k = SystemDictionary::resolve_or_fail(
1006 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
1007 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1008 if (!linked) {
1009 tty->print_cr("Unable to link/verify VirtualMachineError class");
1010 return false; // initialization failed
1011 }
1012 Universe::_virtual_machine_error_instance =
1013 InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1014
1015 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1016
1017 if (!DumpSharedSpaces) {
1018 // These are the only Java fields that are currently set during shared space dumping.
1019 // We prefer to not handle this generally, so we always reinitialize these detail messages.
1020 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
1021 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
1022
1023 msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
1024 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
1025 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
1026 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
1027
1028 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
1029 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
1030
1031 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
1032 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
1033
1034 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false);
1035 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg());
1036
1037 msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1038 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
1039
1040 // Setup the array of errors that have preallocated backtrace
1041 k = Universe::_out_of_memory_error_java_heap->klass();
1042 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
1043 ik = InstanceKlass::cast(k);
1044
1045 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
1046 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false);
1047 for (int i=0; i<len; i++) {
1048 oop err = ik->allocate_instance(CHECK_false);
1049 Handle err_h = Handle(THREAD, err);
1050 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
1051 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
1052 }
1053 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
1054 }
1055
1056 Universe::initialize_known_methods(CHECK_false);
1057
1058 // This needs to be done before the first scavenge/gc, since
1059 // it's an input to soft ref clearing policy.
1060 {
1061 MutexLocker x(Heap_lock);
1062 Universe::update_heap_info_at_gc();
1063 }
1064
1065 // ("weak") refs processing infrastructure initialization
1066 Universe::heap()->post_initialize();
1067
1068 // Initialize performance counters for metaspaces
1069 MetaspaceCounters::initialize_performance_counters();
1070 CompressedClassSpaceCounters::initialize_performance_counters();
1071
1072 MemoryService::add_metaspace_memory_pools();
1073
1074 MemoryService::set_universe_heap(Universe::heap());
1075 #if INCLUDE_CDS
1076 SharedClassUtil::initialize(CHECK_false);
1077 #endif
1078 return true;
1079 }
1080
1081
1082 void Universe::compute_base_vtable_size() {
1083 _base_vtable_size = ClassLoader::compute_Object_vtable();
1084 }
1085
1086 void Universe::print_on(outputStream* st) {
1087 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1088 st->print_cr("Heap");
1089 heap()->print_on(st);
1090 }
1091
1092 void Universe::print_heap_at_SIGBREAK() {
1093 if (PrintHeapAtSIGBREAK) {
1094 print_on(tty);
1095 tty->cr();
1096 tty->flush();
1097 }
1098 }
1099
1100 void Universe::print_heap_before_gc() {
1101 LogTarget(Debug, gc, heap) lt;
1102 if (lt.is_enabled()) {
1103 LogStream ls(lt);
1104 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1105 ResourceMark rm;
1106 heap()->print_on(&ls);
1107 }
1108 }
1109
1110 void Universe::print_heap_after_gc() {
1111 LogTarget(Debug, gc, heap) lt;
1112 if (lt.is_enabled()) {
1113 LogStream ls(lt);
1114 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1115 ResourceMark rm;
1116 heap()->print_on(&ls);
1117 }
1118 }
1119
1120 void Universe::initialize_verify_flags() {
1121 verify_flags = 0;
1122 const char delimiter[] = " ,";
1123
1124 size_t length = strlen(VerifySubSet);
1125 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1126 strncpy(subset_list, VerifySubSet, length + 1);
1127
1128 char* token = strtok(subset_list, delimiter);
1129 while (token != NULL) {
1130 if (strcmp(token, "threads") == 0) {
1131 verify_flags |= Verify_Threads;
1132 } else if (strcmp(token, "heap") == 0) {
1133 verify_flags |= Verify_Heap;
1134 } else if (strcmp(token, "symbol_table") == 0) {
1135 verify_flags |= Verify_SymbolTable;
1136 } else if (strcmp(token, "string_table") == 0) {
1137 verify_flags |= Verify_StringTable;
1138 } else if (strcmp(token, "codecache") == 0) {
1139 verify_flags |= Verify_CodeCache;
1140 } else if (strcmp(token, "dictionary") == 0) {
1141 verify_flags |= Verify_SystemDictionary;
1142 } else if (strcmp(token, "classloader_data_graph") == 0) {
1143 verify_flags |= Verify_ClassLoaderDataGraph;
1144 } else if (strcmp(token, "metaspace") == 0) {
1145 verify_flags |= Verify_MetaspaceAux;
1146 } else if (strcmp(token, "jni_handles") == 0) {
1147 verify_flags |= Verify_JNIHandles;
1148 } else if (strcmp(token, "codecache_oops") == 0) {
1149 verify_flags |= Verify_CodeCacheOops;
1150 } else {
1151 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1152 }
1153 token = strtok(NULL, delimiter);
1154 }
1155 FREE_C_HEAP_ARRAY(char, subset_list);
1156 }
1157
1158 bool Universe::should_verify_subset(uint subset) {
1159 if (verify_flags & subset) {
1160 return true;
1161 }
1162 return false;
1163 }
1164
1165 void Universe::verify(VerifyOption option, const char* prefix) {
1166 // The use of _verify_in_progress is a temporary work around for
1167 // 6320749. Don't bother with a creating a class to set and clear
1168 // it since it is only used in this method and the control flow is
1169 // straight forward.
1170 _verify_in_progress = true;
1171
1172 COMPILER2_PRESENT(
1173 assert(!DerivedPointerTable::is_active(),
1174 "DPT should not be active during verification "
1175 "(of thread stacks below)");
1176 )
1177
1178 ResourceMark rm;
1179 HandleMark hm; // Handles created during verification can be zapped
1180 _verify_count++;
1181
1182 FormatBuffer<> title("Verifying %s", prefix);
1183 GCTraceTime(Info, gc, verify) tm(title.buffer());
1184 if (should_verify_subset(Verify_Threads)) {
1185 log_debug(gc, verify)("Threads");
1186 Threads::verify();
1187 }
1188 if (should_verify_subset(Verify_Heap)) {
1189 log_debug(gc, verify)("Heap");
1190 heap()->verify(option);
1191 }
1192 if (should_verify_subset(Verify_SymbolTable)) {
1193 log_debug(gc, verify)("SymbolTable");
1194 SymbolTable::verify();
1195 }
1196 if (should_verify_subset(Verify_StringTable)) {
1197 log_debug(gc, verify)("StringTable");
1198 StringTable::verify();
1199 }
1200 if (should_verify_subset(Verify_CodeCache)) {
1201 {
1202 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1203 log_debug(gc, verify)("CodeCache");
1204 CodeCache::verify();
1205 }
1206 }
1207 if (should_verify_subset(Verify_SystemDictionary)) {
1208 log_debug(gc, verify)("SystemDictionary");
1209 SystemDictionary::verify();
1210 }
1211 #ifndef PRODUCT
1212 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1213 log_debug(gc, verify)("ClassLoaderDataGraph");
1214 ClassLoaderDataGraph::verify();
1215 }
1216 #endif
1217 if (should_verify_subset(Verify_MetaspaceAux)) {
1218 log_debug(gc, verify)("MetaspaceAux");
1219 MetaspaceAux::verify_free_chunks();
1220 }
1221 if (should_verify_subset(Verify_JNIHandles)) {
1222 log_debug(gc, verify)("JNIHandles");
1223 JNIHandles::verify();
1224 }
1225 if (should_verify_subset(Verify_CodeCacheOops)) {
1226 log_debug(gc, verify)("CodeCache Oops");
1227 CodeCache::verify_oops();
1228 }
1229
1230 _verify_in_progress = false;
1231 }
1232
1233
1234 #ifndef PRODUCT
1235 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1236 assert(low_boundary < high_boundary, "bad interval");
1237
1238 // decide which low-order bits we require to be clear:
1239 size_t alignSize = MinObjAlignmentInBytes;
1240 size_t min_object_size = CollectedHeap::min_fill_size();
1241
1242 // make an inclusive limit:
1243 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1244 uintptr_t min = (uintptr_t)low_boundary;
1245 assert(min < max, "bad interval");
1246 uintptr_t diff = max ^ min;
1247
1248 // throw away enough low-order bits to make the diff vanish
1249 uintptr_t mask = (uintptr_t)(-1);
1250 while ((mask & diff) != 0)
1251 mask <<= 1;
1252 uintptr_t bits = (min & mask);
1253 assert(bits == (max & mask), "correct mask");
1254 // check an intermediate value between min and max, just to make sure:
1255 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1256
1257 // require address alignment, too:
1258 mask |= (alignSize - 1);
1259
1260 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1261 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1262 }
1263 _verify_oop_mask = mask;
1264 _verify_oop_bits = bits;
1265 }
1266
1267 // Oop verification (see MacroAssembler::verify_oop)
1268
1269 uintptr_t Universe::verify_oop_mask() {
1270 MemRegion m = heap()->reserved_region();
1271 calculate_verify_data(m.start(), m.end());
1272 return _verify_oop_mask;
1273 }
1274
1275 uintptr_t Universe::verify_oop_bits() {
1276 MemRegion m = heap()->reserved_region();
1277 calculate_verify_data(m.start(), m.end());
1278 return _verify_oop_bits;
1279 }
1280
1281 uintptr_t Universe::verify_mark_mask() {
1282 return markOopDesc::lock_mask_in_place;
1283 }
1284
1285 uintptr_t Universe::verify_mark_bits() {
1286 intptr_t mask = verify_mark_mask();
1287 intptr_t bits = (intptr_t)markOopDesc::prototype();
1288 assert((bits & ~mask) == 0, "no stray header bits");
1289 return bits;
1290 }
1291 #endif // PRODUCT
1292
1293
1294 void Universe::compute_verify_oop_data() {
1295 verify_oop_mask();
1296 verify_oop_bits();
1297 verify_mark_mask();
1298 verify_mark_bits();
1299 }
1300
1301
1302 void LatestMethodCache::init(Klass* k, Method* m) {
1303 if (!UseSharedSpaces) {
1304 _klass = k;
1305 }
1306 #ifndef PRODUCT
1307 else {
1308 // sharing initilization should have already set up _klass
1309 assert(_klass != NULL, "just checking");
1310 }
1311 #endif
1312
1313 _method_idnum = m->method_idnum();
1314 assert(_method_idnum >= 0, "sanity check");
1315 }
1316
1317
1318 Method* LatestMethodCache::get_method() {
1319 if (klass() == NULL) return NULL;
1320 InstanceKlass* ik = InstanceKlass::cast(klass());
1321 Method* m = ik->method_with_idnum(method_idnum());
1322 assert(m != NULL, "sanity check");
1323 return m;
1324 }
1325
1326
1327 #ifdef ASSERT
1328 // Release dummy object(s) at bottom of heap
1329 bool Universe::release_fullgc_alot_dummy() {
1330 MutexLocker ml(FullGCALot_lock);
1331 if (_fullgc_alot_dummy_array != NULL) {
1332 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
1333 // No more dummies to release, release entire array instead
1334 _fullgc_alot_dummy_array = NULL;
1335 return false;
1336 }
1337 if (!UseConcMarkSweepGC) {
1338 // Release dummy at bottom of old generation
1339 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1340 }
1341 // Release dummy at bottom of permanent generation
1342 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1343 }
1344 return true;
1345 }
1346
1347 #endif // ASSERT