1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "aot/aotLoader.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/classLoaderData.hpp"
29 #include "classfile/javaClasses.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/vmSymbols.hpp"
33 #include "code/codeCache.hpp"
34 #include "code/dependencies.hpp"
35 #include "gc/shared/cardTableBarrierSet.hpp"
36 #include "gc/shared/collectedHeap.inline.hpp"
37 #include "gc/shared/gcArguments.hpp"
38 #include "gc/shared/gcConfig.hpp"
39 #include "gc/shared/gcLocker.hpp"
40 #include "gc/shared/generation.hpp"
41 #include "gc/shared/gcTraceTime.inline.hpp"
42 #include "gc/shared/space.hpp"
43 #include "interpreter/interpreter.hpp"
44 #include "logging/log.hpp"
45 #include "logging/logStream.hpp"
46 #include "memory/filemap.hpp"
47 #include "memory/metadataFactory.hpp"
48 #include "memory/metaspaceClosure.hpp"
49 #include "memory/metaspaceCounters.hpp"
50 #include "memory/metaspaceShared.hpp"
51 #include "memory/oopFactory.hpp"
52 #include "memory/resourceArea.hpp"
53 #include "memory/universe.hpp"
54 #include "memory/universe.hpp"
55 #include "oops/constantPool.hpp"
56 #include "oops/instanceClassLoaderKlass.hpp"
57 #include "oops/instanceKlass.hpp"
58 #include "oops/instanceMirrorKlass.hpp"
59 #include "oops/instanceRefKlass.hpp"
60 #include "oops/objArrayOop.inline.hpp"
61 #include "oops/oop.inline.hpp"
62 #include "oops/typeArrayKlass.hpp"
63 #include "prims/resolvedMethodTable.hpp"
64 #include "runtime/arguments.hpp"
65 #include "runtime/atomic.hpp"
66 #include "runtime/commandLineFlagConstraintList.hpp"
67 #include "runtime/deoptimization.hpp"
68 #include "runtime/handles.inline.hpp"
69 #include "runtime/init.hpp"
70 #include "runtime/java.hpp"
71 #include "runtime/javaCalls.hpp"
72 #include "runtime/sharedRuntime.hpp"
73 #include "runtime/synchronizer.hpp"
74 #include "runtime/thread.inline.hpp"
75 #include "runtime/timerTrace.hpp"
76 #include "runtime/vm_operations.hpp"
77 #include "services/memoryService.hpp"
78 #include "utilities/align.hpp"
79 #include "utilities/copy.hpp"
80 #include "utilities/debug.hpp"
81 #include "utilities/events.hpp"
82 #include "utilities/formatBuffer.hpp"
83 #include "utilities/hashtable.inline.hpp"
84 #include "utilities/macros.hpp"
85 #include "utilities/ostream.hpp"
86 #include "utilities/preserveException.hpp"
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_sentinel = NULL;
117 oop Universe::_the_null_string = NULL;
118 oop Universe::_the_min_jint_string = NULL;
119 LatestMethodCache* Universe::_finalizer_register_cache = NULL;
120 LatestMethodCache* Universe::_loader_addClass_cache = NULL;
121 LatestMethodCache* Universe::_pd_implies_cache = NULL;
122 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL;
123 LatestMethodCache* Universe::_do_stack_walk_cache = NULL;
124 oop Universe::_out_of_memory_error_java_heap = NULL;
125 oop Universe::_out_of_memory_error_metaspace = NULL;
126 oop Universe::_out_of_memory_error_class_metaspace = NULL;
127 oop Universe::_out_of_memory_error_array_size = NULL;
128 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL;
129 oop Universe::_out_of_memory_error_realloc_objects = NULL;
130 oop Universe::_delayed_stack_overflow_error_message = NULL;
131 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL;
132 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
133 bool Universe::_verify_in_progress = false;
134 long Universe::verify_flags = Universe::Verify_All;
135 oop Universe::_null_ptr_exception_instance = NULL;
136 oop Universe::_arithmetic_exception_instance = NULL;
137 oop Universe::_virtual_machine_error_instance = NULL;
138 oop Universe::_vm_exception = 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 uint64_t Universe::_narrow_klass_range = (uint64_t(max_juint)+1);
171
172 void Universe::basic_type_classes_do(void f(Klass*)) {
173 f(boolArrayKlassObj());
174 f(byteArrayKlassObj());
175 f(charArrayKlassObj());
176 f(intArrayKlassObj());
177 f(shortArrayKlassObj());
178 f(longArrayKlassObj());
179 f(singleArrayKlassObj());
180 f(doubleArrayKlassObj());
181 }
182
183 void Universe::oops_do(OopClosure* f, bool do_all) {
184
185 f->do_oop((oop*) &_int_mirror);
186 f->do_oop((oop*) &_float_mirror);
187 f->do_oop((oop*) &_double_mirror);
188 f->do_oop((oop*) &_byte_mirror);
189 f->do_oop((oop*) &_bool_mirror);
190 f->do_oop((oop*) &_char_mirror);
191 f->do_oop((oop*) &_long_mirror);
192 f->do_oop((oop*) &_short_mirror);
193 f->do_oop((oop*) &_void_mirror);
194
195 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
196 f->do_oop((oop*) &_mirrors[i]);
197 }
198 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
199
200 f->do_oop((oop*)&_the_empty_class_klass_array);
201 f->do_oop((oop*)&_the_null_sentinel);
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*)&_reference_pending_list);
219 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);)
220 }
221
222 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
223 it->push(&_klass);
224 }
225
226 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
227 it->push(&_boolArrayKlassObj);
228 it->push(&_byteArrayKlassObj);
229 it->push(&_charArrayKlassObj);
230 it->push(&_intArrayKlassObj);
231 it->push(&_shortArrayKlassObj);
232 it->push(&_longArrayKlassObj);
233 it->push(&_singleArrayKlassObj);
234 it->push(&_doubleArrayKlassObj);
235 for (int i = 0; i < T_VOID+1; i++) {
236 it->push(&_typeArrayKlassObjs[i]);
237 }
238 it->push(&_objectArrayKlassObj);
239
240 it->push(&_the_empty_int_array);
241 it->push(&_the_empty_short_array);
242 it->push(&_the_empty_klass_array);
243 it->push(&_the_empty_method_array);
244 it->push(&_the_array_interfaces_array);
245
246 _finalizer_register_cache->metaspace_pointers_do(it);
247 _loader_addClass_cache->metaspace_pointers_do(it);
248 _pd_implies_cache->metaspace_pointers_do(it);
249 _throw_illegal_access_error_cache->metaspace_pointers_do(it);
250 _do_stack_walk_cache->metaspace_pointers_do(it);
251 }
252
253 // Serialize metadata and pointers to primitive type mirrors in and out of CDS archive
254 void Universe::serialize(SerializeClosure* f, bool do_all) {
255
256 f->do_ptr((void**)&_boolArrayKlassObj);
257 f->do_ptr((void**)&_byteArrayKlassObj);
258 f->do_ptr((void**)&_charArrayKlassObj);
259 f->do_ptr((void**)&_intArrayKlassObj);
260 f->do_ptr((void**)&_shortArrayKlassObj);
261 f->do_ptr((void**)&_longArrayKlassObj);
262 f->do_ptr((void**)&_singleArrayKlassObj);
263 f->do_ptr((void**)&_doubleArrayKlassObj);
264 f->do_ptr((void**)&_objectArrayKlassObj);
265
266 {
267 for (int i = 0; i < T_VOID+1; i++) {
268 if (_typeArrayKlassObjs[i] != NULL) {
269 assert(i >= T_BOOLEAN, "checking");
270 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
271 } else if (do_all) {
272 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
273 }
274 }
275 }
276
277 #if INCLUDE_CDS_JAVA_HEAP
278 // The mirrors are NULL if MetaspaceShared::is_heap_object_archiving_allowed
279 // is false.
280 f->do_oop(&_int_mirror);
281 f->do_oop(&_float_mirror);
282 f->do_oop(&_double_mirror);
283 f->do_oop(&_byte_mirror);
284 f->do_oop(&_bool_mirror);
285 f->do_oop(&_char_mirror);
286 f->do_oop(&_long_mirror);
287 f->do_oop(&_short_mirror);
288 f->do_oop(&_void_mirror);
289 #endif
290
291 f->do_ptr((void**)&_the_array_interfaces_array);
292 f->do_ptr((void**)&_the_empty_int_array);
293 f->do_ptr((void**)&_the_empty_short_array);
294 f->do_ptr((void**)&_the_empty_method_array);
295 f->do_ptr((void**)&_the_empty_klass_array);
296 _finalizer_register_cache->serialize(f);
297 _loader_addClass_cache->serialize(f);
298 _pd_implies_cache->serialize(f);
299 _throw_illegal_access_error_cache->serialize(f);
300 _do_stack_walk_cache->serialize(f);
301 }
302
303 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
304 if (size < alignment || size % alignment != 0) {
305 vm_exit_during_initialization(
306 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
307 }
308 }
309
310 void initialize_basic_type_klass(Klass* k, TRAPS) {
311 Klass* ok = SystemDictionary::Object_klass();
312 #if INCLUDE_CDS
313 if (UseSharedSpaces) {
314 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
315 assert(k->super() == ok, "u3");
316 k->restore_unshareable_info(loader_data, Handle(), CHECK);
317 } else
318 #endif
319 {
320 k->initialize_supers(ok, CHECK);
321 }
322 k->append_to_sibling_list();
323 }
324
325 void Universe::genesis(TRAPS) {
326 ResourceMark rm;
327
328 { FlagSetting fs(_bootstrapping, true);
329
330 { MutexLocker mc(Compile_lock);
331
332 java_lang_Class::allocate_fixup_lists();
333
334 // determine base vtable size; without that we cannot create the array klasses
335 compute_base_vtable_size();
336
337 if (!UseSharedSpaces) {
338 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK);
339 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK);
340 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK);
341 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK);
342 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK);
343 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK);
344 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK);
345 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK);
346
347 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj;
348 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj;
349 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj;
350 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj;
351 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj;
352 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj;
353 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj;
354 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj;
355
356 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
357
358 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
359 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
360 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
361 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
362 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
363 }
364 }
365
366 vmSymbols::initialize(CHECK);
367
368 SystemDictionary::initialize(CHECK);
369
370 Klass* ok = SystemDictionary::Object_klass();
371
372 _the_null_string = StringTable::intern("null", CHECK);
373 _the_min_jint_string = StringTable::intern("-2147483648", CHECK);
374
375 #if INCLUDE_CDS
376 if (UseSharedSpaces) {
377 // Verify shared interfaces array.
378 assert(_the_array_interfaces_array->at(0) ==
379 SystemDictionary::Cloneable_klass(), "u3");
380 assert(_the_array_interfaces_array->at(1) ==
381 SystemDictionary::Serializable_klass(), "u3");
382 MetaspaceShared::fixup_mapped_heap_regions();
383 } else
384 #endif
385 {
386 // Set up shared interfaces array. (Do this before supers are set up.)
387 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
388 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
389 }
390
391 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
392 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
393 initialize_basic_type_klass(singleArrayKlassObj(), CHECK);
394 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
395 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
396 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
397 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
398 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
399 } // end of core bootstrapping
400
401 {
402 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
403 _the_null_sentinel = tns();
404 }
405
406 // Maybe this could be lifted up now that object array can be initialized
407 // during the bootstrapping.
408
409 // OLD
410 // Initialize _objectArrayKlass after core bootstraping to make
411 // sure the super class is set up properly for _objectArrayKlass.
412 // ---
413 // NEW
414 // Since some of the old system object arrays have been converted to
415 // ordinary object arrays, _objectArrayKlass will be loaded when
416 // SystemDictionary::initialize(CHECK); is run. See the extra check
417 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
418 _objectArrayKlassObj = InstanceKlass::
419 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
420 // OLD
421 // Add the class to the class hierarchy manually to make sure that
422 // its vtable is initialized after core bootstrapping is completed.
423 // ---
424 // New
425 // Have already been initialized.
426 _objectArrayKlassObj->append_to_sibling_list();
427
428 #ifdef ASSERT
429 if (FullGCALot) {
430 // Allocate an array of dummy objects.
431 // We'd like these to be at the bottom of the old generation,
432 // so that when we free one and then collect,
433 // (almost) the whole heap moves
434 // and we find out if we actually update all the oops correctly.
435 // But we can't allocate directly in the old generation,
436 // so we allocate wherever, and hope that the first collection
437 // moves these objects to the bottom of the old generation.
438 // We can allocate directly in the permanent generation, so we do.
439 int size;
440 if (UseConcMarkSweepGC) {
441 log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate");
442 size = FullGCALotDummies;
443 } else {
444 size = FullGCALotDummies * 2;
445 }
446 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
447 objArrayHandle dummy_array(THREAD, naked_array);
448 int i = 0;
449 while (i < size) {
450 // Allocate dummy in old generation
451 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK);
452 dummy_array->obj_at_put(i++, dummy);
453 }
454 {
455 // Only modify the global variable inside the mutex.
456 // If we had a race to here, the other dummy_array instances
457 // and their elements just get dropped on the floor, which is fine.
458 MutexLocker ml(FullGCALot_lock);
459 if (_fullgc_alot_dummy_array == NULL) {
460 _fullgc_alot_dummy_array = dummy_array();
461 }
462 }
463 assert(i == _fullgc_alot_dummy_array->length(), "just checking");
464 }
465 #endif
466 }
467
468 void Universe::initialize_basic_type_mirrors(TRAPS) {
469 #if INCLUDE_CDS_JAVA_HEAP
470 if (UseSharedSpaces &&
471 MetaspaceShared::open_archive_heap_region_mapped() &&
472 _int_mirror != NULL) {
473 assert(MetaspaceShared::is_heap_object_archiving_allowed(), "Sanity");
474 assert(_float_mirror != NULL && _double_mirror != NULL &&
475 _byte_mirror != NULL && _byte_mirror != NULL &&
476 _bool_mirror != NULL && _char_mirror != NULL &&
477 _long_mirror != NULL && _short_mirror != NULL &&
478 _void_mirror != NULL, "Sanity");
479 } else
480 #endif
481 {
482 _int_mirror =
483 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK);
484 _float_mirror =
485 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK);
486 _double_mirror =
487 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK);
488 _byte_mirror =
489 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK);
490 _bool_mirror =
491 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
492 _char_mirror =
493 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK);
494 _long_mirror =
495 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK);
496 _short_mirror =
497 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK);
498 _void_mirror =
499 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK);
500 }
501
502 _mirrors[T_INT] = _int_mirror;
503 _mirrors[T_FLOAT] = _float_mirror;
504 _mirrors[T_DOUBLE] = _double_mirror;
505 _mirrors[T_BYTE] = _byte_mirror;
506 _mirrors[T_BOOLEAN] = _bool_mirror;
507 _mirrors[T_CHAR] = _char_mirror;
508 _mirrors[T_LONG] = _long_mirror;
509 _mirrors[T_SHORT] = _short_mirror;
510 _mirrors[T_VOID] = _void_mirror;
511 //_mirrors[T_OBJECT] = _object_klass->java_mirror();
512 //_mirrors[T_ARRAY] = _object_klass->java_mirror();
513 }
514
515 void Universe::fixup_mirrors(TRAPS) {
516 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
517 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
518 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
519 // that the number of objects allocated at this point is very small.
520 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
521 HandleMark hm(THREAD);
522 // Cache the start of the static fields
523 InstanceMirrorKlass::init_offset_of_static_fields();
524
525 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
526 int list_length = list->length();
527 for (int i = 0; i < list_length; i++) {
528 Klass* k = list->at(i);
529 assert(k->is_klass(), "List should only hold classes");
530 EXCEPTION_MARK;
531 java_lang_Class::fixup_mirror(k, CATCH);
532 }
533 delete java_lang_Class::fixup_mirror_list();
534 java_lang_Class::set_fixup_mirror_list(NULL);
535 }
536
537 #define assert_pll_locked(test) \
538 assert(Heap_lock->test(), "Reference pending list access requires lock")
539
540 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
541
542 oop Universe::reference_pending_list() {
543 if (Thread::current()->is_VM_thread()) {
544 assert_pll_locked(is_locked);
545 } else {
546 assert_pll_ownership();
547 }
548 return _reference_pending_list;
549 }
550
551 void Universe::set_reference_pending_list(oop list) {
552 assert_pll_ownership();
553 _reference_pending_list = list;
554 }
555
556 bool Universe::has_reference_pending_list() {
557 assert_pll_ownership();
558 return _reference_pending_list != NULL;
559 }
560
561 oop Universe::swap_reference_pending_list(oop list) {
562 assert_pll_locked(is_locked);
563 return Atomic::xchg(list, &_reference_pending_list);
564 }
565
566 #undef assert_pll_locked
567 #undef assert_pll_ownership
568
569 // initialize_vtable could cause gc if
570 // 1) we specified true to initialize_vtable and
571 // 2) this ran after gc was enabled
572 // In case those ever change we use handles for oops
573 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) {
574 // init vtable of k and all subclasses
575 ko->vtable().initialize_vtable(false, CHECK);
576 if (ko->is_instance_klass()) {
577 for (Klass* sk = ko->subklass();
578 sk != NULL;
579 sk = sk->next_sibling()) {
580 reinitialize_vtable_of(sk, CHECK);
581 }
582 }
583 }
584
585
586 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) {
587 k->itable().initialize_itable(false, CHECK);
588 }
589
590
591 void Universe::reinitialize_itables(TRAPS) {
592 ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK);
593 }
594
595
596 bool Universe::on_page_boundary(void* addr) {
597 return is_aligned(addr, os::vm_page_size());
598 }
599
600
601 bool Universe::should_fill_in_stack_trace(Handle throwable) {
602 // never attempt to fill in the stack trace of preallocated errors that do not have
603 // backtrace. These errors are kept alive forever and may be "re-used" when all
604 // preallocated errors with backtrace have been consumed. Also need to avoid
605 // a potential loop which could happen if an out of memory occurs when attempting
606 // to allocate the backtrace.
607 return ((!oopDesc::equals(throwable(), Universe::_out_of_memory_error_java_heap)) &&
608 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_metaspace)) &&
609 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_class_metaspace)) &&
610 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_array_size)) &&
611 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_gc_overhead_limit)) &&
612 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_realloc_objects)));
613 }
614
615
616 oop Universe::gen_out_of_memory_error(oop default_err) {
617 // generate an out of memory error:
618 // - if there is a preallocated error and stack traces are available
619 // (j.l.Throwable is initialized), then return the preallocated
620 // error with a filled in stack trace, and with the message
621 // provided by the default error.
622 // - otherwise, return the default error, without a stack trace.
623 int next;
624 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
625 SystemDictionary::Throwable_klass()->is_initialized()) {
626 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);
627 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
628 } else {
629 next = -1;
630 }
631 if (next < 0) {
632 // all preallocated errors have been used.
633 // return default
634 return default_err;
635 } else {
636 Thread* THREAD = Thread::current();
637 Handle default_err_h(THREAD, default_err);
638 // get the error object at the slot and set set it to NULL so that the
639 // array isn't keeping it alive anymore.
640 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next));
641 assert(exc() != NULL, "slot has been used already");
642 preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
643
644 // use the message from the default error
645 oop msg = java_lang_Throwable::message(default_err_h());
646 assert(msg != NULL, "no message");
647 java_lang_Throwable::set_message(exc(), msg);
648
649 // populate the stack trace and return it.
650 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
651 return exc();
652 }
653 }
654
655 intptr_t Universe::_non_oop_bits = 0;
656
657 void* Universe::non_oop_word() {
658 // Neither the high bits nor the low bits of this value is allowed
659 // to look like (respectively) the high or low bits of a real oop.
660 //
661 // High and low are CPU-specific notions, but low always includes
662 // the low-order bit. Since oops are always aligned at least mod 4,
663 // setting the low-order bit will ensure that the low half of the
664 // word will never look like that of a real oop.
665 //
666 // Using the OS-supplied non-memory-address word (usually 0 or -1)
667 // will take care of the high bits, however many there are.
668
669 if (_non_oop_bits == 0) {
670 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
671 }
672
673 return (void*)_non_oop_bits;
674 }
675
676 jint universe_init() {
677 assert(!Universe::_fully_initialized, "called after initialize_vtables");
678 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
679 "LogHeapWordSize is incorrect.");
680 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
681 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
682 "oop size is not not a multiple of HeapWord size");
683
684 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
685
686 JavaClasses::compute_hard_coded_offsets();
687
688 jint status = Universe::initialize_heap();
689 if (status != JNI_OK) {
690 return status;
691 }
692
693 SystemDictionary::initialize_oop_storage();
694
695 Metaspace::global_initialize();
696
697 // Initialize performance counters for metaspaces
698 MetaspaceCounters::initialize_performance_counters();
699 CompressedClassSpaceCounters::initialize_performance_counters();
700
701 AOTLoader::universe_init();
702
703 // Checks 'AfterMemoryInit' constraints.
704 if (!CommandLineFlagConstraintList::check_constraints(CommandLineFlagConstraint::AfterMemoryInit)) {
705 return JNI_EINVAL;
706 }
707
708 // Create memory for metadata. Must be after initializing heap for
709 // DumpSharedSpaces.
710 ClassLoaderData::init_null_class_loader_data();
711
712 // We have a heap so create the Method* caches before
713 // Metaspace::initialize_shared_spaces() tries to populate them.
714 Universe::_finalizer_register_cache = new LatestMethodCache();
715 Universe::_loader_addClass_cache = new LatestMethodCache();
716 Universe::_pd_implies_cache = new LatestMethodCache();
717 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
718 Universe::_do_stack_walk_cache = new LatestMethodCache();
719
720 #if INCLUDE_CDS
721 if (UseSharedSpaces) {
722 // Read the data structures supporting the shared spaces (shared
723 // system dictionary, symbol table, etc.). After that, access to
724 // the file (other than the mapped regions) is no longer needed, and
725 // the file is closed. Closing the file does not affect the
726 // currently mapped regions.
727 MetaspaceShared::initialize_shared_spaces();
728 StringTable::create_table();
729 } else
730 #endif
731 {
732 SymbolTable::create_table();
733 StringTable::create_table();
734
735 #if INCLUDE_CDS
736 if (DumpSharedSpaces) {
737 MetaspaceShared::prepare_for_dumping();
738 }
739 #endif
740 }
741 if (strlen(VerifySubSet) > 0) {
742 Universe::initialize_verify_flags();
743 }
744
745 ResolvedMethodTable::create_table();
746
747 return JNI_OK;
748 }
749
750 CollectedHeap* Universe::create_heap() {
751 assert(_collectedHeap == NULL, "Heap already created");
752 return GCConfig::arguments()->create_heap();
753 }
754
755 // Choose the heap base address and oop encoding mode
756 // when compressed oops are used:
757 // Unscaled - Use 32-bits oops without encoding when
758 // NarrowOopHeapBaseMin + heap_size < 4Gb
759 // ZeroBased - Use zero based compressed oops with encoding when
760 // NarrowOopHeapBaseMin + heap_size < 32Gb
761 // HeapBased - Use compressed oops with heap base + encoding.
762
763 jint Universe::initialize_heap() {
764 _collectedHeap = create_heap();
765 jint status = _collectedHeap->initialize();
766 if (status != JNI_OK) {
767 return status;
768 }
769 log_info(gc)("Using %s", _collectedHeap->name());
770
771 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
772
773 #ifdef _LP64
774 if (UseCompressedOops) {
775 // Subtract a page because something can get allocated at heap base.
776 // This also makes implicit null checking work, because the
777 // memory+1 page below heap_base needs to cause a signal.
778 // See needs_explicit_null_check.
779 // Only set the heap base for compressed oops because it indicates
780 // compressed oops for pstack code.
781 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) {
782 // Didn't reserve heap below 4Gb. Must shift.
783 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
784 }
785 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) {
786 // Did reserve heap below 32Gb. Can use base == 0;
787 Universe::set_narrow_oop_base(0);
788 }
789
790 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base());
791
792 LogTarget(Info, gc, heap, coops) lt;
793 if (lt.is_enabled()) {
794 ResourceMark rm;
795 LogStream ls(lt);
796 Universe::print_compressed_oops_mode(&ls);
797 }
798
799 // Tell tests in which mode we run.
800 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode",
801 narrow_oop_mode_to_string(narrow_oop_mode()),
802 false));
803 }
804 // Universe::narrow_oop_base() is one page below the heap.
805 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() -
806 os::vm_page_size()) ||
807 Universe::narrow_oop_base() == NULL, "invalid value");
808 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes ||
809 Universe::narrow_oop_shift() == 0, "invalid value");
810 #endif
811
812 // We will never reach the CATCH below since Exceptions::_throw will cause
813 // the VM to exit if an exception is thrown during initialization
814
815 if (UseTLAB) {
816 assert(Universe::heap()->supports_tlab_allocation(),
817 "Should support thread-local allocation buffers");
818 ThreadLocalAllocBuffer::startup_initialization();
819 }
820 return JNI_OK;
821 }
822
823 void Universe::print_compressed_oops_mode(outputStream* st) {
824 st->print("Heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
825 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M);
826
827 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode()));
828
829 if (Universe::narrow_oop_base() != 0) {
830 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base()));
831 }
832
833 if (Universe::narrow_oop_shift() != 0) {
834 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
835 }
836
837 if (!Universe::narrow_oop_use_implicit_null_checks()) {
838 st->print(", no protected page in front of the heap");
839 }
840 st->cr();
841 }
842
843 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
844
845 assert(alignment <= Arguments::conservative_max_heap_alignment(),
846 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
847 alignment, Arguments::conservative_max_heap_alignment());
848
849 size_t total_reserved = align_up(heap_size, alignment);
850 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
851 "heap size is too big for compressed oops");
852
853 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size());
854 assert(!UseLargePages
855 || UseParallelGC
856 || use_large_pages, "Wrong alignment to use large pages");
857
858 // Now create the space.
859 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt);
860
861 if (total_rs.is_reserved()) {
862 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
863 "must be exactly of required size and alignment");
864 // We are good.
865
866 if (UseCompressedOops) {
867 // Universe::initialize_heap() will reset this to NULL if unscaled
868 // or zero-based narrow oops are actually used.
869 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
870 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
871 }
872
873 if (AllocateHeapAt != NULL) {
874 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
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 default:
908 ShouldNotReachHere();
909 return "";
910 }
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 Klass* ok = SystemDictionary::Object_klass();
1001 Universe::reinitialize_vtable_of(ok, CHECK_false);
1002 Universe::reinitialize_itables(CHECK_false);
1003 }
1004 }
1005
1006 HandleMark hm(THREAD);
1007 // Setup preallocated empty java.lang.Class array
1008 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
1009
1010 // Setup preallocated OutOfMemoryError errors
1011 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
1012 InstanceKlass* ik = InstanceKlass::cast(k);
1013 Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false);
1014 Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false);
1015 Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false);
1016 Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false);
1017 Universe::_out_of_memory_error_gc_overhead_limit =
1018 ik->allocate_instance(CHECK_false);
1019 Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false);
1020
1021 // Setup preallocated cause message for delayed StackOverflowError
1022 if (StackReservedPages > 0) {
1023 Universe::_delayed_stack_overflow_error_message =
1024 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
1025 }
1026
1027 // Setup preallocated NullPointerException
1028 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1029 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
1030 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1031 // Setup preallocated ArithmeticException
1032 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1033 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
1034 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1035 // Virtual Machine Error for when we get into a situation we can't resolve
1036 k = SystemDictionary::resolve_or_fail(
1037 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
1038 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1039 if (!linked) {
1040 tty->print_cr("Unable to link/verify VirtualMachineError class");
1041 return false; // initialization failed
1042 }
1043 Universe::_virtual_machine_error_instance =
1044 InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1045
1046 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1047
1048 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
1049 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
1050
1051 msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
1052 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
1053 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
1054 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
1055
1056 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
1057 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
1058
1059 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
1060 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
1061
1062 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false);
1063 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg());
1064
1065 msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1066 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
1067
1068 // Setup the array of errors that have preallocated backtrace
1069 k = Universe::_out_of_memory_error_java_heap->klass();
1070 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
1071 ik = InstanceKlass::cast(k);
1072
1073 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
1074 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false);
1075 for (int i=0; i<len; i++) {
1076 oop err = ik->allocate_instance(CHECK_false);
1077 Handle err_h = Handle(THREAD, err);
1078 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
1079 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
1080 }
1081 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
1082
1083 Universe::initialize_known_methods(CHECK_false);
1084
1085 // This needs to be done before the first scavenge/gc, since
1086 // it's an input to soft ref clearing policy.
1087 {
1088 MutexLocker x(Heap_lock);
1089 Universe::update_heap_info_at_gc();
1090 }
1091
1092 // ("weak") refs processing infrastructure initialization
1093 Universe::heap()->post_initialize();
1094
1095 MemoryService::add_metaspace_memory_pools();
1096
1097 MemoryService::set_universe_heap(Universe::heap());
1098 #if INCLUDE_CDS
1099 SharedClassUtil::initialize(CHECK_false);
1100 #endif
1101 return true;
1102 }
1103
1104
1105 void Universe::compute_base_vtable_size() {
1106 _base_vtable_size = ClassLoader::compute_Object_vtable();
1107 }
1108
1109 void Universe::print_on(outputStream* st) {
1110 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1111 st->print_cr("Heap");
1112 heap()->print_on(st);
1113 }
1114
1115 void Universe::print_heap_at_SIGBREAK() {
1116 if (PrintHeapAtSIGBREAK) {
1117 print_on(tty);
1118 tty->cr();
1119 tty->flush();
1120 }
1121 }
1122
1123 void Universe::print_heap_before_gc() {
1124 LogTarget(Debug, gc, heap) lt;
1125 if (lt.is_enabled()) {
1126 LogStream ls(lt);
1127 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1128 ResourceMark rm;
1129 heap()->print_on(&ls);
1130 }
1131 }
1132
1133 void Universe::print_heap_after_gc() {
1134 LogTarget(Debug, gc, heap) lt;
1135 if (lt.is_enabled()) {
1136 LogStream ls(lt);
1137 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1138 ResourceMark rm;
1139 heap()->print_on(&ls);
1140 }
1141 }
1142
1143 void Universe::initialize_verify_flags() {
1144 verify_flags = 0;
1145 const char delimiter[] = " ,";
1146
1147 size_t length = strlen(VerifySubSet);
1148 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1149 strncpy(subset_list, VerifySubSet, length + 1);
1150
1151 char* token = strtok(subset_list, delimiter);
1152 while (token != NULL) {
1153 if (strcmp(token, "threads") == 0) {
1154 verify_flags |= Verify_Threads;
1155 } else if (strcmp(token, "heap") == 0) {
1156 verify_flags |= Verify_Heap;
1157 } else if (strcmp(token, "symbol_table") == 0) {
1158 verify_flags |= Verify_SymbolTable;
1159 } else if (strcmp(token, "string_table") == 0) {
1160 verify_flags |= Verify_StringTable;
1161 } else if (strcmp(token, "codecache") == 0) {
1162 verify_flags |= Verify_CodeCache;
1163 } else if (strcmp(token, "dictionary") == 0) {
1164 verify_flags |= Verify_SystemDictionary;
1165 } else if (strcmp(token, "classloader_data_graph") == 0) {
1166 verify_flags |= Verify_ClassLoaderDataGraph;
1167 } else if (strcmp(token, "metaspace") == 0) {
1168 verify_flags |= Verify_MetaspaceUtils;
1169 } else if (strcmp(token, "jni_handles") == 0) {
1170 verify_flags |= Verify_JNIHandles;
1171 } else if (strcmp(token, "codecache_oops") == 0) {
1172 verify_flags |= Verify_CodeCacheOops;
1173 } else {
1174 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1175 }
1176 token = strtok(NULL, delimiter);
1177 }
1178 FREE_C_HEAP_ARRAY(char, subset_list);
1179 }
1180
1181 bool Universe::should_verify_subset(uint subset) {
1182 if (verify_flags & subset) {
1183 return true;
1184 }
1185 return false;
1186 }
1187
1188 void Universe::verify(VerifyOption option, const char* prefix) {
1189 // The use of _verify_in_progress is a temporary work around for
1190 // 6320749. Don't bother with a creating a class to set and clear
1191 // it since it is only used in this method and the control flow is
1192 // straight forward.
1193 _verify_in_progress = true;
1194
1195 COMPILER2_PRESENT(
1196 assert(!DerivedPointerTable::is_active(),
1197 "DPT should not be active during verification "
1198 "(of thread stacks below)");
1199 )
1200
1201 ResourceMark rm;
1202 HandleMark hm; // Handles created during verification can be zapped
1203 _verify_count++;
1204
1205 FormatBuffer<> title("Verifying %s", prefix);
1206 GCTraceTime(Info, gc, verify) tm(title.buffer());
1207 if (should_verify_subset(Verify_Threads)) {
1208 log_debug(gc, verify)("Threads");
1209 Threads::verify();
1210 }
1211 if (should_verify_subset(Verify_Heap)) {
1212 log_debug(gc, verify)("Heap");
1213 heap()->verify(option);
1214 }
1215 if (should_verify_subset(Verify_SymbolTable)) {
1216 log_debug(gc, verify)("SymbolTable");
1217 SymbolTable::verify();
1218 }
1219 if (should_verify_subset(Verify_StringTable)) {
1220 log_debug(gc, verify)("StringTable");
1221 StringTable::verify();
1222 }
1223 if (should_verify_subset(Verify_CodeCache)) {
1224 {
1225 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1226 log_debug(gc, verify)("CodeCache");
1227 CodeCache::verify();
1228 }
1229 }
1230 if (should_verify_subset(Verify_SystemDictionary)) {
1231 log_debug(gc, verify)("SystemDictionary");
1232 SystemDictionary::verify();
1233 }
1234 #ifndef PRODUCT
1235 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1236 log_debug(gc, verify)("ClassLoaderDataGraph");
1237 ClassLoaderDataGraph::verify();
1238 }
1239 #endif
1240 if (should_verify_subset(Verify_MetaspaceUtils)) {
1241 log_debug(gc, verify)("MetaspaceUtils");
1242 MetaspaceUtils::verify_free_chunks();
1243 }
1244 if (should_verify_subset(Verify_JNIHandles)) {
1245 log_debug(gc, verify)("JNIHandles");
1246 JNIHandles::verify();
1247 }
1248 if (should_verify_subset(Verify_CodeCacheOops)) {
1249 log_debug(gc, verify)("CodeCache Oops");
1250 CodeCache::verify_oops();
1251 }
1252
1253 _verify_in_progress = false;
1254 }
1255
1256
1257 #ifndef PRODUCT
1258 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1259 assert(low_boundary < high_boundary, "bad interval");
1260
1261 // decide which low-order bits we require to be clear:
1262 size_t alignSize = MinObjAlignmentInBytes;
1263 size_t min_object_size = CollectedHeap::min_fill_size();
1264
1265 // make an inclusive limit:
1266 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1267 uintptr_t min = (uintptr_t)low_boundary;
1268 assert(min < max, "bad interval");
1269 uintptr_t diff = max ^ min;
1270
1271 // throw away enough low-order bits to make the diff vanish
1272 uintptr_t mask = (uintptr_t)(-1);
1273 while ((mask & diff) != 0)
1274 mask <<= 1;
1275 uintptr_t bits = (min & mask);
1276 assert(bits == (max & mask), "correct mask");
1277 // check an intermediate value between min and max, just to make sure:
1278 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1279
1280 // require address alignment, too:
1281 mask |= (alignSize - 1);
1282
1283 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1284 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1285 }
1286 _verify_oop_mask = mask;
1287 _verify_oop_bits = bits;
1288 }
1289
1290 // Oop verification (see MacroAssembler::verify_oop)
1291
1292 uintptr_t Universe::verify_oop_mask() {
1293 MemRegion m = heap()->reserved_region();
1294 calculate_verify_data(m.start(), m.end());
1295 return _verify_oop_mask;
1296 }
1297
1298 uintptr_t Universe::verify_oop_bits() {
1299 MemRegion m = heap()->reserved_region();
1300 calculate_verify_data(m.start(), m.end());
1301 return _verify_oop_bits;
1302 }
1303
1304 uintptr_t Universe::verify_mark_mask() {
1305 return markOopDesc::lock_mask_in_place;
1306 }
1307
1308 uintptr_t Universe::verify_mark_bits() {
1309 intptr_t mask = verify_mark_mask();
1310 intptr_t bits = (intptr_t)markOopDesc::prototype();
1311 assert((bits & ~mask) == 0, "no stray header bits");
1312 return bits;
1313 }
1314 #endif // PRODUCT
1315
1316
1317 void Universe::compute_verify_oop_data() {
1318 verify_oop_mask();
1319 verify_oop_bits();
1320 verify_mark_mask();
1321 verify_mark_bits();
1322 }
1323
1324
1325 void LatestMethodCache::init(Klass* k, Method* m) {
1326 if (!UseSharedSpaces) {
1327 _klass = k;
1328 }
1329 #ifndef PRODUCT
1330 else {
1331 // sharing initilization should have already set up _klass
1332 assert(_klass != NULL, "just checking");
1333 }
1334 #endif
1335
1336 _method_idnum = m->method_idnum();
1337 assert(_method_idnum >= 0, "sanity check");
1338 }
1339
1340
1341 Method* LatestMethodCache::get_method() {
1342 if (klass() == NULL) return NULL;
1343 InstanceKlass* ik = InstanceKlass::cast(klass());
1344 Method* m = ik->method_with_idnum(method_idnum());
1345 assert(m != NULL, "sanity check");
1346 return m;
1347 }
1348
1349
1350 #ifdef ASSERT
1351 // Release dummy object(s) at bottom of heap
1352 bool Universe::release_fullgc_alot_dummy() {
1353 MutexLocker ml(FullGCALot_lock);
1354 if (_fullgc_alot_dummy_array != NULL) {
1355 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
1356 // No more dummies to release, release entire array instead
1357 _fullgc_alot_dummy_array = NULL;
1358 return false;
1359 }
1360 if (!UseConcMarkSweepGC) {
1361 // Release dummy at bottom of old generation
1362 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1363 }
1364 // Release dummy at bottom of permanent generation
1365 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1366 }
1367 return true;
1368 }
1369
1370 #endif // ASSERT