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