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