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