1 /*
2 * Copyright (c) 1997, 2016, 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 "memory/filemap.hpp"
45 #include "memory/metadataFactory.hpp"
46 #include "memory/metaspaceShared.hpp"
47 #include "memory/oopFactory.hpp"
48 #include "memory/resourceArea.hpp"
49 #include "memory/universe.hpp"
50 #include "memory/universe.inline.hpp"
51 #include "oops/constantPool.hpp"
52 #include "oops/instanceClassLoaderKlass.hpp"
53 #include "oops/instanceKlass.hpp"
54 #include "oops/instanceMirrorKlass.hpp"
55 #include "oops/instanceRefKlass.hpp"
56 #include "oops/objArrayOop.inline.hpp"
57 #include "oops/oop.inline.hpp"
58 #include "oops/typeArrayKlass.hpp"
59 #include "runtime/arguments.hpp"
60 #include "runtime/atomic.hpp"
61 #include "runtime/commandLineFlagConstraintList.hpp"
62 #include "runtime/deoptimization.hpp"
63 #include "runtime/fprofiler.hpp"
64 #include "runtime/handles.inline.hpp"
65 #include "runtime/init.hpp"
66 #include "runtime/java.hpp"
67 #include "runtime/javaCalls.hpp"
68 #include "runtime/sharedRuntime.hpp"
69 #include "runtime/synchronizer.hpp"
70 #include "runtime/thread.inline.hpp"
71 #include "runtime/timerTrace.hpp"
72 #include "runtime/vm_operations.hpp"
73 #include "services/memoryService.hpp"
74 #include "utilities/copy.hpp"
75 #include "utilities/events.hpp"
76 #include "utilities/hashtable.inline.hpp"
77 #include "utilities/macros.hpp"
78 #include "utilities/ostream.hpp"
79 #include "utilities/preserveException.hpp"
80 #if INCLUDE_ALL_GCS
81 #include "gc/cms/cmsCollectorPolicy.hpp"
82 #include "gc/g1/g1CollectedHeap.inline.hpp"
83 #include "gc/g1/g1CollectorPolicy.hpp"
84 #include "gc/parallel/parallelScavengeHeap.hpp"
85 #include "gc/shared/adaptiveSizePolicy.hpp"
86 #endif // INCLUDE_ALL_GCS
87 #if INCLUDE_CDS
88 #include "classfile/sharedClassUtil.hpp"
89 #endif
90
91 // Known objects
92 Klass* Universe::_boolArrayKlassObj = NULL;
93 Klass* Universe::_byteArrayKlassObj = NULL;
94 Klass* Universe::_charArrayKlassObj = NULL;
95 Klass* Universe::_intArrayKlassObj = NULL;
96 Klass* Universe::_shortArrayKlassObj = NULL;
97 Klass* Universe::_longArrayKlassObj = NULL;
98 Klass* Universe::_singleArrayKlassObj = NULL;
99 Klass* Universe::_doubleArrayKlassObj = NULL;
100 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ };
101 Klass* Universe::_objectArrayKlassObj = NULL;
102 oop Universe::_int_mirror = NULL;
103 oop Universe::_float_mirror = NULL;
104 oop Universe::_double_mirror = NULL;
105 oop Universe::_byte_mirror = NULL;
106 oop Universe::_bool_mirror = NULL;
107 oop Universe::_char_mirror = NULL;
108 oop Universe::_long_mirror = NULL;
109 oop Universe::_short_mirror = NULL;
110 oop Universe::_void_mirror = NULL;
111 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ };
112 oop Universe::_main_thread_group = NULL;
113 oop Universe::_system_thread_group = NULL;
114 objArrayOop Universe::_the_empty_class_klass_array = NULL;
115 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
116 oop Universe::_the_null_string = NULL;
117 oop Universe::_the_min_jint_string = NULL;
118 LatestMethodCache* Universe::_finalizer_register_cache = NULL;
119 LatestMethodCache* Universe::_loader_addClass_cache = NULL;
120 LatestMethodCache* Universe::_pd_implies_cache = NULL;
121 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL;
122 LatestMethodCache* Universe::_do_stack_walk_cache = NULL;
123 oop Universe::_out_of_memory_error_java_heap = NULL;
124 oop Universe::_out_of_memory_error_metaspace = NULL;
125 oop Universe::_out_of_memory_error_class_metaspace = NULL;
126 oop Universe::_out_of_memory_error_array_size = NULL;
127 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL;
128 oop Universe::_out_of_memory_error_realloc_objects = NULL;
129 oop Universe::_delayed_stack_overflow_error_message = NULL;
130 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL;
131 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
132 bool Universe::_verify_in_progress = false;
133 long Universe::verify_flags = Universe::Verify_All;
134 oop Universe::_null_ptr_exception_instance = NULL;
135 oop Universe::_arithmetic_exception_instance = NULL;
136 oop Universe::_virtual_machine_error_instance = NULL;
137 oop Universe::_vm_exception = NULL;
138 oop Universe::_allocation_context_notification_obj = NULL;
139 oop Universe::_reference_pending_list = NULL;
140
141 Array<int>* Universe::_the_empty_int_array = NULL;
142 Array<u2>* Universe::_the_empty_short_array = NULL;
143 Array<Klass*>* Universe::_the_empty_klass_array = NULL;
144 Array<Method*>* Universe::_the_empty_method_array = NULL;
145
146 // These variables are guarded by FullGCALot_lock.
147 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;)
148 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
149
150 // Heap
151 int Universe::_verify_count = 0;
152
153 // Oop verification (see MacroAssembler::verify_oop)
154 uintptr_t Universe::_verify_oop_mask = 0;
155 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
156
157 int Universe::_base_vtable_size = 0;
158 bool Universe::_bootstrapping = false;
159 bool Universe::_module_initialized = false;
160 bool Universe::_fully_initialized = false;
161
162 size_t Universe::_heap_capacity_at_last_gc;
163 size_t Universe::_heap_used_at_last_gc = 0;
164
165 CollectedHeap* Universe::_collectedHeap = NULL;
166
167 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true };
168 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true };
169 address Universe::_narrow_ptrs_base;
170
171 void Universe::basic_type_classes_do(void f(Klass*)) {
172 f(boolArrayKlassObj());
173 f(byteArrayKlassObj());
174 f(charArrayKlassObj());
175 f(intArrayKlassObj());
176 f(shortArrayKlassObj());
177 f(longArrayKlassObj());
178 f(singleArrayKlassObj());
179 f(doubleArrayKlassObj());
180 }
181
182 void Universe::oops_do(OopClosure* f, bool do_all) {
183
184 f->do_oop((oop*) &_int_mirror);
185 f->do_oop((oop*) &_float_mirror);
186 f->do_oop((oop*) &_double_mirror);
187 f->do_oop((oop*) &_byte_mirror);
188 f->do_oop((oop*) &_bool_mirror);
189 f->do_oop((oop*) &_char_mirror);
190 f->do_oop((oop*) &_long_mirror);
191 f->do_oop((oop*) &_short_mirror);
192 f->do_oop((oop*) &_void_mirror);
193
194 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
195 f->do_oop((oop*) &_mirrors[i]);
196 }
197 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
198
199 f->do_oop((oop*)&_the_empty_class_klass_array);
200 f->do_oop((oop*)&_the_null_string);
201 f->do_oop((oop*)&_the_min_jint_string);
202 f->do_oop((oop*)&_out_of_memory_error_java_heap);
203 f->do_oop((oop*)&_out_of_memory_error_metaspace);
204 f->do_oop((oop*)&_out_of_memory_error_class_metaspace);
205 f->do_oop((oop*)&_out_of_memory_error_array_size);
206 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit);
207 f->do_oop((oop*)&_out_of_memory_error_realloc_objects);
208 f->do_oop((oop*)&_delayed_stack_overflow_error_message);
209 f->do_oop((oop*)&_preallocated_out_of_memory_error_array);
210 f->do_oop((oop*)&_null_ptr_exception_instance);
211 f->do_oop((oop*)&_arithmetic_exception_instance);
212 f->do_oop((oop*)&_virtual_machine_error_instance);
213 f->do_oop((oop*)&_main_thread_group);
214 f->do_oop((oop*)&_system_thread_group);
215 f->do_oop((oop*)&_vm_exception);
216 f->do_oop((oop*)&_allocation_context_notification_obj);
217 f->do_oop((oop*)&_reference_pending_list);
218 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);)
219 }
220
221 // Serialize metadata in and out of CDS archive, not oops.
222 void Universe::serialize(SerializeClosure* f, bool do_all) {
223
224 f->do_ptr((void**)&_boolArrayKlassObj);
225 f->do_ptr((void**)&_byteArrayKlassObj);
226 f->do_ptr((void**)&_charArrayKlassObj);
227 f->do_ptr((void**)&_intArrayKlassObj);
228 f->do_ptr((void**)&_shortArrayKlassObj);
229 f->do_ptr((void**)&_longArrayKlassObj);
230 f->do_ptr((void**)&_singleArrayKlassObj);
231 f->do_ptr((void**)&_doubleArrayKlassObj);
232 f->do_ptr((void**)&_objectArrayKlassObj);
233
234 {
235 for (int i = 0; i < T_VOID+1; i++) {
236 if (_typeArrayKlassObjs[i] != NULL) {
237 assert(i >= T_BOOLEAN, "checking");
238 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
239 } else if (do_all) {
240 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
241 }
242 }
243 }
244
245 f->do_ptr((void**)&_the_array_interfaces_array);
246 f->do_ptr((void**)&_the_empty_int_array);
247 f->do_ptr((void**)&_the_empty_short_array);
248 f->do_ptr((void**)&_the_empty_method_array);
249 f->do_ptr((void**)&_the_empty_klass_array);
250 _finalizer_register_cache->serialize(f);
251 _loader_addClass_cache->serialize(f);
252 _pd_implies_cache->serialize(f);
253 _throw_illegal_access_error_cache->serialize(f);
254 _do_stack_walk_cache->serialize(f);
255 }
256
257 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
258 if (size < alignment || size % alignment != 0) {
259 vm_exit_during_initialization(
260 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
261 }
262 }
263
264 void initialize_basic_type_klass(Klass* k, TRAPS) {
265 Klass* ok = SystemDictionary::Object_klass();
266 #if INCLUDE_CDS
267 if (UseSharedSpaces) {
268 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
269 assert(k->super() == ok, "u3");
270 k->restore_unshareable_info(loader_data, Handle(), CHECK);
271 } else
272 #endif
273 {
274 k->initialize_supers(ok, CHECK);
275 }
276 k->append_to_sibling_list();
277 }
278
279 void Universe::genesis(TRAPS) {
280 ResourceMark rm;
281
282 { FlagSetting fs(_bootstrapping, true);
283
284 { MutexLocker mc(Compile_lock);
285
286 // determine base vtable size; without that we cannot create the array klasses
287 compute_base_vtable_size();
288
289 if (!UseSharedSpaces) {
290 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK);
291 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK);
292 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK);
293 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK);
294 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK);
295 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK);
296 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK);
297 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK);
298
299 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj;
300 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj;
301 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj;
302 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj;
303 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj;
304 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj;
305 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj;
306 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj;
307
308 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
309
310 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
311 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
312 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
313 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
314 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
315 }
316 }
317
318 vmSymbols::initialize(CHECK);
319
320 SystemDictionary::initialize(CHECK);
321
322 Klass* ok = SystemDictionary::Object_klass();
323
324 _the_null_string = StringTable::intern("null", CHECK);
325 _the_min_jint_string = StringTable::intern("-2147483648", CHECK);
326
327 #if INCLUDE_CDS
328 if (UseSharedSpaces) {
329 // Verify shared interfaces array.
330 assert(_the_array_interfaces_array->at(0) ==
331 SystemDictionary::Cloneable_klass(), "u3");
332 assert(_the_array_interfaces_array->at(1) ==
333 SystemDictionary::Serializable_klass(), "u3");
334 MetaspaceShared::fixup_shared_string_regions();
335 } else
336 #endif
337 {
338 // Set up shared interfaces array. (Do this before supers are set up.)
339 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
340 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
341 }
342
343 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
344 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
345 initialize_basic_type_klass(singleArrayKlassObj(), CHECK);
346 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
347 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
348 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
349 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
350 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
351 } // end of core bootstrapping
352
353 // Maybe this could be lifted up now that object array can be initialized
354 // during the bootstrapping.
355
356 // OLD
357 // Initialize _objectArrayKlass after core bootstraping to make
358 // sure the super class is set up properly for _objectArrayKlass.
359 // ---
360 // NEW
361 // Since some of the old system object arrays have been converted to
362 // ordinary object arrays, _objectArrayKlass will be loaded when
363 // SystemDictionary::initialize(CHECK); is run. See the extra check
364 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
365 _objectArrayKlassObj = InstanceKlass::
366 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
367 // OLD
368 // Add the class to the class hierarchy manually to make sure that
369 // its vtable is initialized after core bootstrapping is completed.
370 // ---
371 // New
372 // Have already been initialized.
373 _objectArrayKlassObj->append_to_sibling_list();
374
375 #ifdef ASSERT
376 if (FullGCALot) {
377 // Allocate an array of dummy objects.
378 // We'd like these to be at the bottom of the old generation,
379 // so that when we free one and then collect,
380 // (almost) the whole heap moves
381 // and we find out if we actually update all the oops correctly.
382 // But we can't allocate directly in the old generation,
383 // so we allocate wherever, and hope that the first collection
384 // moves these objects to the bottom of the old generation.
385 // We can allocate directly in the permanent generation, so we do.
386 int size;
387 if (UseConcMarkSweepGC) {
388 log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate");
389 size = FullGCALotDummies;
390 } else {
391 size = FullGCALotDummies * 2;
392 }
393 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
394 objArrayHandle dummy_array(THREAD, naked_array);
395 int i = 0;
396 while (i < size) {
397 // Allocate dummy in old generation
398 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK);
399 dummy_array->obj_at_put(i++, dummy);
400 }
401 {
402 // Only modify the global variable inside the mutex.
403 // If we had a race to here, the other dummy_array instances
404 // and their elements just get dropped on the floor, which is fine.
405 MutexLocker ml(FullGCALot_lock);
406 if (_fullgc_alot_dummy_array == NULL) {
407 _fullgc_alot_dummy_array = dummy_array();
408 }
409 }
410 assert(i == _fullgc_alot_dummy_array->length(), "just checking");
411 }
412 #endif
413
414 // Initialize dependency array for null class loader
415 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK);
416
417 }
418
419 // CDS support for patching vtables in metadata in the shared archive.
420 // All types inherited from Metadata have vtables, but not types inherited
421 // from MetaspaceObj, because the latter does not have virtual functions.
422 // If the metadata type has a vtable, it cannot be shared in the read-only
423 // section of the CDS archive, because the vtable pointer is patched.
424 static inline void add_vtable(void** list, int* n, void* o, int count) {
425 guarantee((*n) < count, "vtable list too small");
426 void* vtable = dereference_vptr(o);
427 assert(*(void**)(vtable) != NULL, "invalid vtable");
428 list[(*n)++] = vtable;
429 }
430
431 void Universe::init_self_patching_vtbl_list(void** list, int count) {
432 int n = 0;
433 { InstanceKlass o; add_vtable(list, &n, &o, count); }
434 { InstanceClassLoaderKlass o; add_vtable(list, &n, &o, count); }
435 { InstanceMirrorKlass o; add_vtable(list, &n, &o, count); }
436 { InstanceRefKlass o; add_vtable(list, &n, &o, count); }
437 { TypeArrayKlass o; add_vtable(list, &n, &o, count); }
438 { ObjArrayKlass o; add_vtable(list, &n, &o, count); }
439 { Method o; add_vtable(list, &n, &o, count); }
440 { ConstantPool o; add_vtable(list, &n, &o, count); }
441 }
442
443 void Universe::initialize_basic_type_mirrors(TRAPS) {
444 assert(_int_mirror==NULL, "basic type mirrors already initialized");
445 _int_mirror =
446 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK);
447 _float_mirror =
448 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK);
449 _double_mirror =
450 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK);
451 _byte_mirror =
452 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK);
453 _bool_mirror =
454 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
455 _char_mirror =
456 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK);
457 _long_mirror =
458 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK);
459 _short_mirror =
460 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK);
461 _void_mirror =
462 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK);
463
464 _mirrors[T_INT] = _int_mirror;
465 _mirrors[T_FLOAT] = _float_mirror;
466 _mirrors[T_DOUBLE] = _double_mirror;
467 _mirrors[T_BYTE] = _byte_mirror;
468 _mirrors[T_BOOLEAN] = _bool_mirror;
469 _mirrors[T_CHAR] = _char_mirror;
470 _mirrors[T_LONG] = _long_mirror;
471 _mirrors[T_SHORT] = _short_mirror;
472 _mirrors[T_VOID] = _void_mirror;
473 //_mirrors[T_OBJECT] = _object_klass->java_mirror();
474 //_mirrors[T_ARRAY] = _object_klass->java_mirror();
475 }
476
477 void Universe::fixup_mirrors(TRAPS) {
478 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
479 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
480 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
481 // that the number of objects allocated at this point is very small.
482 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
483 HandleMark hm(THREAD);
484 // Cache the start of the static fields
485 InstanceMirrorKlass::init_offset_of_static_fields();
486
487 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
488 int list_length = list->length();
489 for (int i = 0; i < list_length; i++) {
490 Klass* k = list->at(i);
491 assert(k->is_klass(), "List should only hold classes");
492 EXCEPTION_MARK;
493 KlassHandle kh(THREAD, k);
494 java_lang_Class::fixup_mirror(kh, CATCH);
495 }
496 delete java_lang_Class::fixup_mirror_list();
497 java_lang_Class::set_fixup_mirror_list(NULL);
498 }
499
500 #define assert_pll_locked(test) \
501 assert(Heap_lock->test(), "Reference pending list access requires lock")
502
503 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
504
505 oop Universe::reference_pending_list() {
506 assert_pll_ownership();
507 return _reference_pending_list;
508 }
509
510 void Universe::set_reference_pending_list(oop list) {
511 assert_pll_ownership();
512 _reference_pending_list = list;
513 }
514
515 bool Universe::has_reference_pending_list() {
516 assert_pll_ownership();
517 return _reference_pending_list != NULL;
518 }
519
520 oop Universe::swap_reference_pending_list(oop list) {
521 assert_pll_locked(is_locked);
522 return (oop)Atomic::xchg_ptr(list, &_reference_pending_list);
523 }
524
525 #undef assert_pll_locked
526 #undef assert_pll_ownership
527
528
529 static bool has_run_finalizers_on_exit = false;
530
531 void Universe::run_finalizers_on_exit() {
532 if (has_run_finalizers_on_exit) return;
533 has_run_finalizers_on_exit = true;
534
535 // Called on VM exit. This ought to be run in a separate thread.
536 log_trace(ref)("Callback to run finalizers on exit");
537 {
538 PRESERVE_EXCEPTION_MARK;
539 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass());
540 JavaValue result(T_VOID);
541 JavaCalls::call_static(
542 &result,
543 finalizer_klass,
544 vmSymbols::run_finalizers_on_exit_name(),
545 vmSymbols::void_method_signature(),
546 THREAD
547 );
548 // Ignore any pending exceptions
549 CLEAR_PENDING_EXCEPTION;
550 }
551 }
552
553
554 // initialize_vtable could cause gc if
555 // 1) we specified true to initialize_vtable and
556 // 2) this ran after gc was enabled
557 // In case those ever change we use handles for oops
558 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) {
559 // init vtable of k and all subclasses
560 Klass* ko = k_h();
561 klassVtable* vt = ko->vtable();
562 if (vt) vt->initialize_vtable(false, CHECK);
563 if (ko->is_instance_klass()) {
564 for (KlassHandle s_h(THREAD, ko->subklass());
565 s_h() != NULL;
566 s_h = KlassHandle(THREAD, s_h()->next_sibling())) {
567 reinitialize_vtable_of(s_h, CHECK);
568 }
569 }
570 }
571
572
573 void initialize_itable_for_klass(Klass* k, TRAPS) {
574 InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK);
575 }
576
577
578 void Universe::reinitialize_itables(TRAPS) {
579 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK);
580
581 }
582
583
584 bool Universe::on_page_boundary(void* addr) {
585 return ((uintptr_t) addr) % os::vm_page_size() == 0;
586 }
587
588
589 bool Universe::should_fill_in_stack_trace(Handle throwable) {
590 // never attempt to fill in the stack trace of preallocated errors that do not have
591 // backtrace. These errors are kept alive forever and may be "re-used" when all
592 // preallocated errors with backtrace have been consumed. Also need to avoid
593 // a potential loop which could happen if an out of memory occurs when attempting
594 // to allocate the backtrace.
595 return ((throwable() != Universe::_out_of_memory_error_java_heap) &&
596 (throwable() != Universe::_out_of_memory_error_metaspace) &&
597 (throwable() != Universe::_out_of_memory_error_class_metaspace) &&
598 (throwable() != Universe::_out_of_memory_error_array_size) &&
599 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) &&
600 (throwable() != Universe::_out_of_memory_error_realloc_objects));
601 }
602
603
604 oop Universe::gen_out_of_memory_error(oop default_err) {
605 // generate an out of memory error:
606 // - if there is a preallocated error and stack traces are available
607 // (j.l.Throwable is initialized), then return the preallocated
608 // error with a filled in stack trace, and with the message
609 // provided by the default error.
610 // - otherwise, return the default error, without a stack trace.
611 int next;
612 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
613 SystemDictionary::Throwable_klass()->is_initialized()) {
614 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);
615 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
616 } else {
617 next = -1;
618 }
619 if (next < 0) {
620 // all preallocated errors have been used.
621 // return default
622 return default_err;
623 } else {
624 // get the error object at the slot and set set it to NULL so that the
625 // array isn't keeping it alive anymore.
626 oop exc = preallocated_out_of_memory_errors()->obj_at(next);
627 assert(exc != NULL, "slot has been used already");
628 preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
629
630 // use the message from the default error
631 oop msg = java_lang_Throwable::message(default_err);
632 assert(msg != NULL, "no message");
633 java_lang_Throwable::set_message(exc, msg);
634
635 // populate the stack trace and return it.
636 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
637 return exc;
638 }
639 }
640
641 intptr_t Universe::_non_oop_bits = 0;
642
643 void* Universe::non_oop_word() {
644 // Neither the high bits nor the low bits of this value is allowed
645 // to look like (respectively) the high or low bits of a real oop.
646 //
647 // High and low are CPU-specific notions, but low always includes
648 // the low-order bit. Since oops are always aligned at least mod 4,
649 // setting the low-order bit will ensure that the low half of the
650 // word will never look like that of a real oop.
651 //
652 // Using the OS-supplied non-memory-address word (usually 0 or -1)
653 // will take care of the high bits, however many there are.
654
655 if (_non_oop_bits == 0) {
656 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
657 }
658
659 return (void*)_non_oop_bits;
660 }
661
662 jint universe_init() {
663 assert(!Universe::_fully_initialized, "called after initialize_vtables");
664 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
665 "LogHeapWordSize is incorrect.");
666 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
667 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
668 "oop size is not not a multiple of HeapWord size");
669
670 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
671
672 JavaClasses::compute_hard_coded_offsets();
673
674 jint status = Universe::initialize_heap();
675 if (status != JNI_OK) {
676 return status;
677 }
678
679 Metaspace::global_initialize();
680
681 AOTLoader::universe_init();
682
683 // Checks 'AfterMemoryInit' constraints.
684 if (!CommandLineFlagConstraintList::check_constraints(CommandLineFlagConstraint::AfterMemoryInit)) {
685 return JNI_EINVAL;
686 }
687
688 // Create memory for metadata. Must be after initializing heap for
689 // DumpSharedSpaces.
690 ClassLoaderData::init_null_class_loader_data();
691
692 // We have a heap so create the Method* caches before
693 // Metaspace::initialize_shared_spaces() tries to populate them.
694 Universe::_finalizer_register_cache = new LatestMethodCache();
695 Universe::_loader_addClass_cache = new LatestMethodCache();
696 Universe::_pd_implies_cache = new LatestMethodCache();
697 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
698 Universe::_do_stack_walk_cache = new LatestMethodCache();
699
700 #if INCLUDE_CDS
701 if (UseSharedSpaces) {
702 // Read the data structures supporting the shared spaces (shared
703 // system dictionary, symbol table, etc.). After that, access to
704 // the file (other than the mapped regions) is no longer needed, and
705 // the file is closed. Closing the file does not affect the
706 // currently mapped regions.
707 MetaspaceShared::initialize_shared_spaces();
708 StringTable::create_table();
709 } else
710 #endif
711 {
712 SymbolTable::create_table();
713 StringTable::create_table();
714
715 #if INCLUDE_CDS
716 if (DumpSharedSpaces) {
717 MetaspaceShared::prepare_for_dumping();
718 }
719 #endif
720 }
721 if (strlen(VerifySubSet) > 0) {
722 Universe::initialize_verify_flags();
723 }
724
725 return JNI_OK;
726 }
727
728 CollectedHeap* Universe::create_heap() {
729 assert(_collectedHeap == NULL, "Heap already created");
730 #if !INCLUDE_ALL_GCS
731 if (UseParallelGC) {
732 fatal("UseParallelGC not supported in this VM.");
733 } else if (UseG1GC) {
734 fatal("UseG1GC not supported in this VM.");
735 } else if (UseConcMarkSweepGC) {
736 fatal("UseConcMarkSweepGC not supported in this VM.");
737 #else
738 if (UseParallelGC) {
739 return Universe::create_heap_with_policy<ParallelScavengeHeap, GenerationSizer>();
740 } else if (UseG1GC) {
741 return Universe::create_heap_with_policy<G1CollectedHeap, G1CollectorPolicy>();
742 } else if (UseConcMarkSweepGC) {
743 return Universe::create_heap_with_policy<GenCollectedHeap, ConcurrentMarkSweepPolicy>();
744 #endif
745 } else if (UseSerialGC) {
746 return Universe::create_heap_with_policy<GenCollectedHeap, MarkSweepPolicy>();
747 }
748
749 ShouldNotReachHere();
750 return NULL;
751 }
752
753 // Choose the heap base address and oop encoding mode
754 // when compressed oops are used:
755 // Unscaled - Use 32-bits oops without encoding when
756 // NarrowOopHeapBaseMin + heap_size < 4Gb
757 // ZeroBased - Use zero based compressed oops with encoding when
758 // NarrowOopHeapBaseMin + heap_size < 32Gb
759 // HeapBased - Use compressed oops with heap base + encoding.
760
761 jint Universe::initialize_heap() {
762 jint status = JNI_ERR;
763
764 _collectedHeap = create_heap_ext();
765 if (_collectedHeap == NULL) {
766 _collectedHeap = create_heap();
767 }
768
769 status = _collectedHeap->initialize();
770 if (status != JNI_OK) {
771 return status;
772 }
773 log_info(gc)("Using %s", _collectedHeap->name());
774
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 if (log_is_enabled(Info, gc, heap, coops)) {
797 ResourceMark rm;
798 outputStream* logst = Log(gc, heap, coops)::info_stream();
799 Universe::print_compressed_oops_mode(logst);
800 }
801
802 // Tell tests in which mode we run.
803 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode",
804 narrow_oop_mode_to_string(narrow_oop_mode()),
805 false));
806 }
807 // Universe::narrow_oop_base() is one page below the heap.
808 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() -
809 os::vm_page_size()) ||
810 Universe::narrow_oop_base() == NULL, "invalid value");
811 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes ||
812 Universe::narrow_oop_shift() == 0, "invalid value");
813 #endif
814
815 // We will never reach the CATCH below since Exceptions::_throw will cause
816 // the VM to exit if an exception is thrown during initialization
817
818 if (UseTLAB) {
819 assert(Universe::heap()->supports_tlab_allocation(),
820 "Should support thread-local allocation buffers");
821 ThreadLocalAllocBuffer::startup_initialization();
822 }
823 return JNI_OK;
824 }
825
826 void Universe::print_compressed_oops_mode(outputStream* st) {
827 st->print("Heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
828 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M);
829
830 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode()));
831
832 if (Universe::narrow_oop_base() != 0) {
833 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base()));
834 }
835
836 if (Universe::narrow_oop_shift() != 0) {
837 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
838 }
839
840 if (!Universe::narrow_oop_use_implicit_null_checks()) {
841 st->print(", no protected page in front of the heap");
842 }
843 st->cr();
844 }
845
846 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
847
848 assert(alignment <= Arguments::conservative_max_heap_alignment(),
849 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
850 alignment, Arguments::conservative_max_heap_alignment());
851
852 size_t total_reserved = align_size_up(heap_size, alignment);
853 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
854 "heap size is too big for compressed oops");
855
856 bool use_large_pages = UseLargePages && is_size_aligned(alignment, os::large_page_size());
857 assert(!UseLargePages
858 || UseParallelGC
859 || use_large_pages, "Wrong alignment to use large pages");
860
861 // Now create the space.
862 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages);
863
864 if (total_rs.is_reserved()) {
865 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
866 "must be exactly of required size and alignment");
867 // We are good.
868
869 if (UseCompressedOops) {
870 // Universe::initialize_heap() will reset this to NULL if unscaled
871 // or zero-based narrow oops are actually used.
872 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
873 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
874 }
875
876 return total_rs;
877 }
878
879 vm_exit_during_initialization(
880 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
881 total_reserved/K));
882
883 // satisfy compiler
884 ShouldNotReachHere();
885 return ReservedHeapSpace(0, 0, false);
886 }
887
888
889 // It's the caller's responsibility to ensure glitch-freedom
890 // (if required).
891 void Universe::update_heap_info_at_gc() {
892 _heap_capacity_at_last_gc = heap()->capacity();
893 _heap_used_at_last_gc = heap()->used();
894 }
895
896
897 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) {
898 switch (mode) {
899 case UnscaledNarrowOop:
900 return "32-bit";
901 case ZeroBasedNarrowOop:
902 return "Zero based";
903 case DisjointBaseNarrowOop:
904 return "Non-zero disjoint base";
905 case HeapBasedNarrowOop:
906 return "Non-zero based";
907 }
908
909 ShouldNotReachHere();
910 return "";
911 }
912
913
914 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() {
915 if (narrow_oop_base_disjoint()) {
916 return DisjointBaseNarrowOop;
917 }
918
919 if (narrow_oop_base() != 0) {
920 return HeapBasedNarrowOop;
921 }
922
923 if (narrow_oop_shift() != 0) {
924 return ZeroBasedNarrowOop;
925 }
926
927 return UnscaledNarrowOop;
928 }
929
930 void initialize_known_method(LatestMethodCache* method_cache,
931 InstanceKlass* ik,
932 const char* method,
933 Symbol* signature,
934 bool is_static, TRAPS)
935 {
936 TempNewSymbol name = SymbolTable::new_symbol(method, CHECK);
937 Method* m = NULL;
938 // The klass must be linked before looking up the method.
939 if (!ik->link_class_or_fail(THREAD) ||
940 ((m = ik->find_method(name, signature)) == NULL) ||
941 is_static != m->is_static()) {
942 ResourceMark rm(THREAD);
943 // NoSuchMethodException doesn't actually work because it tries to run the
944 // <init> function before java_lang_Class is linked. Print error and exit.
945 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
946 ik->name()->as_C_string(), method));
947 }
948 method_cache->init(ik, m);
949 }
950
951 void Universe::initialize_known_methods(TRAPS) {
952 // Set up static method for registering finalizers
953 initialize_known_method(_finalizer_register_cache,
954 SystemDictionary::Finalizer_klass(),
955 "register",
956 vmSymbols::object_void_signature(), true, CHECK);
957
958 initialize_known_method(_throw_illegal_access_error_cache,
959 SystemDictionary::internal_Unsafe_klass(),
960 "throwIllegalAccessError",
961 vmSymbols::void_method_signature(), true, CHECK);
962
963 // Set up method for registering loaded classes in class loader vector
964 initialize_known_method(_loader_addClass_cache,
965 SystemDictionary::ClassLoader_klass(),
966 "addClass",
967 vmSymbols::class_void_signature(), false, CHECK);
968
969 // Set up method for checking protection domain
970 initialize_known_method(_pd_implies_cache,
971 SystemDictionary::ProtectionDomain_klass(),
972 "impliesCreateAccessControlContext",
973 vmSymbols::void_boolean_signature(), false, CHECK);
974
975 // Set up method for stack walking
976 initialize_known_method(_do_stack_walk_cache,
977 SystemDictionary::AbstractStackWalker_klass(),
978 "doStackWalk",
979 vmSymbols::doStackWalk_signature(), false, CHECK);
980 }
981
982 void universe2_init() {
983 EXCEPTION_MARK;
984 Universe::genesis(CATCH);
985 }
986
987 // Set after initialization of the module runtime, call_initModuleRuntime
988 void universe_post_module_init() {
989 Universe::_module_initialized = true;
990 }
991
992 bool universe_post_init() {
993 assert(!is_init_completed(), "Error: initialization not yet completed!");
994 Universe::_fully_initialized = true;
995 EXCEPTION_MARK;
996 { ResourceMark rm;
997 Interpreter::initialize(); // needed for interpreter entry points
998 if (!UseSharedSpaces) {
999 HandleMark hm(THREAD);
1000 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass());
1001 Universe::reinitialize_vtable_of(ok_h, CHECK_false);
1002 Universe::reinitialize_itables(CHECK_false);
1003 }
1004 }
1005
1006 HandleMark hm(THREAD);
1007 Klass* k;
1008 instanceKlassHandle k_h;
1009 // Setup preallocated empty java.lang.Class array
1010 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
1011
1012 // Setup preallocated OutOfMemoryError errors
1013 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
1014 k_h = instanceKlassHandle(THREAD, k);
1015 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false);
1016 Universe::_out_of_memory_error_metaspace = k_h->allocate_instance(CHECK_false);
1017 Universe::_out_of_memory_error_class_metaspace = k_h->allocate_instance(CHECK_false);
1018 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false);
1019 Universe::_out_of_memory_error_gc_overhead_limit =
1020 k_h->allocate_instance(CHECK_false);
1021 Universe::_out_of_memory_error_realloc_objects = k_h->allocate_instance(CHECK_false);
1022
1023 // Setup preallocated cause message for delayed StackOverflowError
1024 if (StackReservedPages > 0) {
1025 Universe::_delayed_stack_overflow_error_message =
1026 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
1027 }
1028
1029 // Setup preallocated NullPointerException
1030 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1031 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
1032 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1033 // Setup preallocated ArithmeticException
1034 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1035 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
1036 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1037 // Virtual Machine Error for when we get into a situation we can't resolve
1038 k = SystemDictionary::resolve_or_fail(
1039 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
1040 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1041 if (!linked) {
1042 tty->print_cr("Unable to link/verify VirtualMachineError class");
1043 return false; // initialization failed
1044 }
1045 Universe::_virtual_machine_error_instance =
1046 InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1047
1048 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1049
1050 if (!DumpSharedSpaces) {
1051 // These are the only Java fields that are currently set during shared space dumping.
1052 // We prefer to not handle this generally, so we always reinitialize these detail messages.
1053 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
1054 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
1055
1056 msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
1057 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
1058 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
1059 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
1060
1061 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
1062 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
1063
1064 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
1065 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
1066
1067 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false);
1068 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg());
1069
1070 msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1071 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
1072
1073 // Setup the array of errors that have preallocated backtrace
1074 k = Universe::_out_of_memory_error_java_heap->klass();
1075 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
1076 k_h = instanceKlassHandle(THREAD, k);
1077
1078 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
1079 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false);
1080 for (int i=0; i<len; i++) {
1081 oop err = k_h->allocate_instance(CHECK_false);
1082 Handle err_h = Handle(THREAD, err);
1083 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
1084 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
1085 }
1086 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
1087 }
1088
1089 Universe::initialize_known_methods(CHECK_false);
1090
1091 // This needs to be done before the first scavenge/gc, since
1092 // it's an input to soft ref clearing policy.
1093 {
1094 MutexLocker x(Heap_lock);
1095 Universe::update_heap_info_at_gc();
1096 }
1097
1098 // ("weak") refs processing infrastructure initialization
1099 Universe::heap()->post_initialize();
1100
1101 // Initialize performance counters for metaspaces
1102 MetaspaceCounters::initialize_performance_counters();
1103 CompressedClassSpaceCounters::initialize_performance_counters();
1104
1105 MemoryService::add_metaspace_memory_pools();
1106
1107 MemoryService::set_universe_heap(Universe::heap());
1108 #if INCLUDE_CDS
1109 SharedClassUtil::initialize(CHECK_false);
1110 #endif
1111 return true;
1112 }
1113
1114
1115 void Universe::compute_base_vtable_size() {
1116 _base_vtable_size = ClassLoader::compute_Object_vtable();
1117 }
1118
1119 void Universe::print_on(outputStream* st) {
1120 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1121 st->print_cr("Heap");
1122 heap()->print_on(st);
1123 }
1124
1125 void Universe::print_heap_at_SIGBREAK() {
1126 if (PrintHeapAtSIGBREAK) {
1127 print_on(tty);
1128 tty->cr();
1129 tty->flush();
1130 }
1131 }
1132
1133 void Universe::print_heap_before_gc() {
1134 Log(gc, heap) log;
1135 if (log.is_debug()) {
1136 log.debug("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1137 ResourceMark rm;
1138 heap()->print_on(log.debug_stream());
1139 }
1140 }
1141
1142 void Universe::print_heap_after_gc() {
1143 Log(gc, heap) log;
1144 if (log.is_debug()) {
1145 log.debug("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1146 ResourceMark rm;
1147 heap()->print_on(log.debug_stream());
1148 }
1149 }
1150
1151 void Universe::initialize_verify_flags() {
1152 verify_flags = 0;
1153 const char delimiter[] = " ,";
1154
1155 size_t length = strlen(VerifySubSet);
1156 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1157 strncpy(subset_list, VerifySubSet, length + 1);
1158
1159 char* token = strtok(subset_list, delimiter);
1160 while (token != NULL) {
1161 if (strcmp(token, "threads") == 0) {
1162 verify_flags |= Verify_Threads;
1163 } else if (strcmp(token, "heap") == 0) {
1164 verify_flags |= Verify_Heap;
1165 } else if (strcmp(token, "symbol_table") == 0) {
1166 verify_flags |= Verify_SymbolTable;
1167 } else if (strcmp(token, "string_table") == 0) {
1168 verify_flags |= Verify_StringTable;
1169 } else if (strcmp(token, "codecache") == 0) {
1170 verify_flags |= Verify_CodeCache;
1171 } else if (strcmp(token, "dictionary") == 0) {
1172 verify_flags |= Verify_SystemDictionary;
1173 } else if (strcmp(token, "classloader_data_graph") == 0) {
1174 verify_flags |= Verify_ClassLoaderDataGraph;
1175 } else if (strcmp(token, "metaspace") == 0) {
1176 verify_flags |= Verify_MetaspaceAux;
1177 } else if (strcmp(token, "jni_handles") == 0) {
1178 verify_flags |= Verify_JNIHandles;
1179 } else if (strcmp(token, "codecache_oops") == 0) {
1180 verify_flags |= Verify_CodeCacheOops;
1181 } else {
1182 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1183 }
1184 token = strtok(NULL, delimiter);
1185 }
1186 FREE_C_HEAP_ARRAY(char, subset_list);
1187 }
1188
1189 bool Universe::should_verify_subset(uint subset) {
1190 if (verify_flags & subset) {
1191 return true;
1192 }
1193 return false;
1194 }
1195
1196 void Universe::verify(VerifyOption option, const char* prefix) {
1197 // The use of _verify_in_progress is a temporary work around for
1198 // 6320749. Don't bother with a creating a class to set and clear
1199 // it since it is only used in this method and the control flow is
1200 // straight forward.
1201 _verify_in_progress = true;
1202
1203 COMPILER2_PRESENT(
1204 assert(!DerivedPointerTable::is_active(),
1205 "DPT should not be active during verification "
1206 "(of thread stacks below)");
1207 )
1208
1209 ResourceMark rm;
1210 HandleMark hm; // Handles created during verification can be zapped
1211 _verify_count++;
1212
1213 FormatBuffer<> title("Verifying %s", prefix);
1214 GCTraceTime(Info, gc, verify) tm(title.buffer());
1215 if (should_verify_subset(Verify_Threads)) {
1216 log_debug(gc, verify)("Threads");
1217 Threads::verify();
1218 }
1219 if (should_verify_subset(Verify_Heap)) {
1220 log_debug(gc, verify)("Heap");
1221 heap()->verify(option);
1222 }
1223 if (should_verify_subset(Verify_SymbolTable)) {
1224 log_debug(gc, verify)("SymbolTable");
1225 SymbolTable::verify();
1226 }
1227 if (should_verify_subset(Verify_StringTable)) {
1228 log_debug(gc, verify)("StringTable");
1229 StringTable::verify();
1230 }
1231 if (should_verify_subset(Verify_CodeCache)) {
1232 {
1233 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1234 log_debug(gc, verify)("CodeCache");
1235 CodeCache::verify();
1236 }
1237 }
1238 if (should_verify_subset(Verify_SystemDictionary)) {
1239 log_debug(gc, verify)("SystemDictionary");
1240 SystemDictionary::verify();
1241 }
1242 #ifndef PRODUCT
1243 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1244 log_debug(gc, verify)("ClassLoaderDataGraph");
1245 ClassLoaderDataGraph::verify();
1246 }
1247 #endif
1248 if (should_verify_subset(Verify_MetaspaceAux)) {
1249 log_debug(gc, verify)("MetaspaceAux");
1250 MetaspaceAux::verify_free_chunks();
1251 }
1252 if (should_verify_subset(Verify_JNIHandles)) {
1253 log_debug(gc, verify)("JNIHandles");
1254 JNIHandles::verify();
1255 }
1256 if (should_verify_subset(Verify_CodeCacheOops)) {
1257 log_debug(gc, verify)("CodeCache Oops");
1258 CodeCache::verify_oops();
1259 }
1260
1261 _verify_in_progress = false;
1262 }
1263
1264
1265 #ifndef PRODUCT
1266 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1267 assert(low_boundary < high_boundary, "bad interval");
1268
1269 // decide which low-order bits we require to be clear:
1270 size_t alignSize = MinObjAlignmentInBytes;
1271 size_t min_object_size = CollectedHeap::min_fill_size();
1272
1273 // make an inclusive limit:
1274 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1275 uintptr_t min = (uintptr_t)low_boundary;
1276 assert(min < max, "bad interval");
1277 uintptr_t diff = max ^ min;
1278
1279 // throw away enough low-order bits to make the diff vanish
1280 uintptr_t mask = (uintptr_t)(-1);
1281 while ((mask & diff) != 0)
1282 mask <<= 1;
1283 uintptr_t bits = (min & mask);
1284 assert(bits == (max & mask), "correct mask");
1285 // check an intermediate value between min and max, just to make sure:
1286 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1287
1288 // require address alignment, too:
1289 mask |= (alignSize - 1);
1290
1291 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1292 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1293 }
1294 _verify_oop_mask = mask;
1295 _verify_oop_bits = bits;
1296 }
1297
1298 // Oop verification (see MacroAssembler::verify_oop)
1299
1300 uintptr_t Universe::verify_oop_mask() {
1301 MemRegion m = heap()->reserved_region();
1302 calculate_verify_data(m.start(), m.end());
1303 return _verify_oop_mask;
1304 }
1305
1306 uintptr_t Universe::verify_oop_bits() {
1307 MemRegion m = heap()->reserved_region();
1308 calculate_verify_data(m.start(), m.end());
1309 return _verify_oop_bits;
1310 }
1311
1312 uintptr_t Universe::verify_mark_mask() {
1313 return markOopDesc::lock_mask_in_place;
1314 }
1315
1316 uintptr_t Universe::verify_mark_bits() {
1317 intptr_t mask = verify_mark_mask();
1318 intptr_t bits = (intptr_t)markOopDesc::prototype();
1319 assert((bits & ~mask) == 0, "no stray header bits");
1320 return bits;
1321 }
1322 #endif // PRODUCT
1323
1324
1325 void Universe::compute_verify_oop_data() {
1326 verify_oop_mask();
1327 verify_oop_bits();
1328 verify_mark_mask();
1329 verify_mark_bits();
1330 }
1331
1332
1333 void LatestMethodCache::init(Klass* k, Method* m) {
1334 if (!UseSharedSpaces) {
1335 _klass = k;
1336 }
1337 #ifndef PRODUCT
1338 else {
1339 // sharing initilization should have already set up _klass
1340 assert(_klass != NULL, "just checking");
1341 }
1342 #endif
1343
1344 _method_idnum = m->method_idnum();
1345 assert(_method_idnum >= 0, "sanity check");
1346 }
1347
1348
1349 Method* LatestMethodCache::get_method() {
1350 if (klass() == NULL) return NULL;
1351 InstanceKlass* ik = InstanceKlass::cast(klass());
1352 Method* m = ik->method_with_idnum(method_idnum());
1353 assert(m != NULL, "sanity check");
1354 return m;
1355 }
1356
1357
1358 #ifdef ASSERT
1359 // Release dummy object(s) at bottom of heap
1360 bool Universe::release_fullgc_alot_dummy() {
1361 MutexLocker ml(FullGCALot_lock);
1362 if (_fullgc_alot_dummy_array != NULL) {
1363 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
1364 // No more dummies to release, release entire array instead
1365 _fullgc_alot_dummy_array = NULL;
1366 return false;
1367 }
1368 if (!UseConcMarkSweepGC) {
1369 // Release dummy at bottom of old generation
1370 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1371 }
1372 // Release dummy at bottom of permanent generation
1373 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1374 }
1375 return true;
1376 }
1377
1378 #endif // ASSERT