1 /*
2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "aot/aotLoader.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/classLoaderData.hpp"
29 #include "classfile/javaClasses.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/vmSymbols.hpp"
33 #include "code/codeCache.hpp"
34 #include "code/dependencies.hpp"
35 #include "gc/shared/cardTableModRefBS.hpp"
36 #include "gc/shared/collectedHeap.inline.hpp"
37 #include "gc/shared/gcLocker.inline.hpp"
38 #include "gc/shared/genCollectedHeap.hpp"
39 #include "gc/shared/generation.hpp"
40 #include "gc/shared/gcTraceTime.inline.hpp"
41 #include "gc/shared/space.hpp"
42 #include "interpreter/interpreter.hpp"
43 #include "logging/log.hpp"
44 #include "memory/filemap.hpp"
45 #include "memory/metadataFactory.hpp"
46 #include "memory/metaspaceShared.hpp"
47 #include "memory/oopFactory.hpp"
48 #include "memory/resourceArea.hpp"
49 #include "memory/universe.hpp"
50 #include "memory/universe.inline.hpp"
51 #include "oops/constantPool.hpp"
52 #include "oops/instanceClassLoaderKlass.hpp"
53 #include "oops/instanceKlass.hpp"
54 #include "oops/instanceMirrorKlass.hpp"
55 #include "oops/instanceRefKlass.hpp"
56 #include "oops/objArrayOop.inline.hpp"
57 #include "oops/oop.inline.hpp"
58 #include "oops/typeArrayKlass.hpp"
59 #include "prims/resolvedMethodTable.hpp"
60 #include "runtime/arguments.hpp"
61 #include "runtime/atomic.hpp"
62 #include "runtime/commandLineFlagConstraintList.hpp"
63 #include "runtime/deoptimization.hpp"
64 #include "runtime/fprofiler.hpp"
65 #include "runtime/handles.inline.hpp"
66 #include "runtime/init.hpp"
67 #include "runtime/java.hpp"
68 #include "runtime/javaCalls.hpp"
69 #include "runtime/sharedRuntime.hpp"
70 #include "runtime/synchronizer.hpp"
71 #include "runtime/thread.inline.hpp"
72 #include "runtime/timerTrace.hpp"
73 #include "runtime/vm_operations.hpp"
74 #include "services/memoryService.hpp"
75 #include "utilities/copy.hpp"
76 #include "utilities/debug.hpp"
77 #include "utilities/events.hpp"
78 #include "utilities/formatBuffer.hpp"
79 #include "utilities/hashtable.inline.hpp"
80 #include "utilities/macros.hpp"
81 #include "utilities/ostream.hpp"
82 #include "utilities/preserveException.hpp"
83 #if INCLUDE_ALL_GCS
84 #include "gc/cms/cmsCollectorPolicy.hpp"
85 #include "gc/g1/g1CollectedHeap.inline.hpp"
86 #include "gc/g1/g1CollectorPolicy.hpp"
87 #include "gc/parallel/parallelScavengeHeap.hpp"
88 #include "gc/shared/adaptiveSizePolicy.hpp"
89 #endif // INCLUDE_ALL_GCS
90 #if INCLUDE_CDS
91 #include "classfile/sharedClassUtil.hpp"
92 #endif
93
94 // Known objects
95 Klass* Universe::_boolArrayKlassObj = NULL;
96 Klass* Universe::_byteArrayKlassObj = NULL;
97 Klass* Universe::_charArrayKlassObj = NULL;
98 Klass* Universe::_intArrayKlassObj = NULL;
99 Klass* Universe::_shortArrayKlassObj = NULL;
100 Klass* Universe::_longArrayKlassObj = NULL;
101 Klass* Universe::_singleArrayKlassObj = NULL;
102 Klass* Universe::_doubleArrayKlassObj = NULL;
103 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ };
104 Klass* Universe::_objectArrayKlassObj = NULL;
105 oop Universe::_int_mirror = NULL;
106 oop Universe::_float_mirror = NULL;
107 oop Universe::_double_mirror = NULL;
108 oop Universe::_byte_mirror = NULL;
109 oop Universe::_bool_mirror = NULL;
110 oop Universe::_char_mirror = NULL;
111 oop Universe::_long_mirror = NULL;
112 oop Universe::_short_mirror = NULL;
113 oop Universe::_void_mirror = NULL;
114 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ };
115 oop Universe::_main_thread_group = NULL;
116 oop Universe::_system_thread_group = NULL;
117 objArrayOop Universe::_the_empty_class_klass_array = NULL;
118 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
119 oop Universe::_the_null_string = NULL;
120 oop Universe::_the_min_jint_string = NULL;
121 LatestMethodCache* Universe::_finalizer_register_cache = NULL;
122 LatestMethodCache* Universe::_loader_addClass_cache = NULL;
123 LatestMethodCache* Universe::_pd_implies_cache = NULL;
124 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL;
125 LatestMethodCache* Universe::_do_stack_walk_cache = NULL;
126 oop Universe::_out_of_memory_error_java_heap = NULL;
127 oop Universe::_out_of_memory_error_metaspace = NULL;
128 oop Universe::_out_of_memory_error_class_metaspace = NULL;
129 oop Universe::_out_of_memory_error_array_size = NULL;
130 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL;
131 oop Universe::_out_of_memory_error_realloc_objects = NULL;
132 oop Universe::_delayed_stack_overflow_error_message = NULL;
133 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL;
134 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
135 bool Universe::_verify_in_progress = false;
136 long Universe::verify_flags = Universe::Verify_All;
137 oop Universe::_null_ptr_exception_instance = NULL;
138 oop Universe::_arithmetic_exception_instance = NULL;
139 oop Universe::_virtual_machine_error_instance = NULL;
140 oop Universe::_vm_exception = NULL;
141 oop Universe::_allocation_context_notification_obj = NULL;
142 oop Universe::_reference_pending_list = NULL;
143
144 Array<int>* Universe::_the_empty_int_array = NULL;
145 Array<u2>* Universe::_the_empty_short_array = NULL;
146 Array<Klass*>* Universe::_the_empty_klass_array = NULL;
147 Array<Method*>* Universe::_the_empty_method_array = NULL;
148
149 // These variables are guarded by FullGCALot_lock.
150 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;)
151 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
152
153 // Heap
154 int Universe::_verify_count = 0;
155
156 // Oop verification (see MacroAssembler::verify_oop)
157 uintptr_t Universe::_verify_oop_mask = 0;
158 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
159
160 int Universe::_base_vtable_size = 0;
161 bool Universe::_bootstrapping = false;
162 bool Universe::_module_initialized = false;
163 bool Universe::_fully_initialized = false;
164
165 size_t Universe::_heap_capacity_at_last_gc;
166 size_t Universe::_heap_used_at_last_gc = 0;
167
168 CollectedHeap* Universe::_collectedHeap = NULL;
169
170 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true };
171 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true };
172 address Universe::_narrow_ptrs_base;
173
174 void Universe::basic_type_classes_do(void f(Klass*)) {
175 f(boolArrayKlassObj());
176 f(byteArrayKlassObj());
177 f(charArrayKlassObj());
178 f(intArrayKlassObj());
179 f(shortArrayKlassObj());
180 f(longArrayKlassObj());
181 f(singleArrayKlassObj());
182 f(doubleArrayKlassObj());
183 }
184
185 void Universe::oops_do(OopClosure* f, bool do_all) {
186
187 f->do_oop((oop*) &_int_mirror);
188 f->do_oop((oop*) &_float_mirror);
189 f->do_oop((oop*) &_double_mirror);
190 f->do_oop((oop*) &_byte_mirror);
191 f->do_oop((oop*) &_bool_mirror);
192 f->do_oop((oop*) &_char_mirror);
193 f->do_oop((oop*) &_long_mirror);
194 f->do_oop((oop*) &_short_mirror);
195 f->do_oop((oop*) &_void_mirror);
196
197 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
198 f->do_oop((oop*) &_mirrors[i]);
199 }
200 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
201
202 f->do_oop((oop*)&_the_empty_class_klass_array);
203 f->do_oop((oop*)&_the_null_string);
204 f->do_oop((oop*)&_the_min_jint_string);
205 f->do_oop((oop*)&_out_of_memory_error_java_heap);
206 f->do_oop((oop*)&_out_of_memory_error_metaspace);
207 f->do_oop((oop*)&_out_of_memory_error_class_metaspace);
208 f->do_oop((oop*)&_out_of_memory_error_array_size);
209 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit);
210 f->do_oop((oop*)&_out_of_memory_error_realloc_objects);
211 f->do_oop((oop*)&_delayed_stack_overflow_error_message);
212 f->do_oop((oop*)&_preallocated_out_of_memory_error_array);
213 f->do_oop((oop*)&_null_ptr_exception_instance);
214 f->do_oop((oop*)&_arithmetic_exception_instance);
215 f->do_oop((oop*)&_virtual_machine_error_instance);
216 f->do_oop((oop*)&_main_thread_group);
217 f->do_oop((oop*)&_system_thread_group);
218 f->do_oop((oop*)&_vm_exception);
219 f->do_oop((oop*)&_allocation_context_notification_obj);
220 f->do_oop((oop*)&_reference_pending_list);
221 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);)
222 }
223
224 // Serialize metadata in and out of CDS archive, not oops.
225 void Universe::serialize(SerializeClosure* f, bool do_all) {
226
227 f->do_ptr((void**)&_boolArrayKlassObj);
228 f->do_ptr((void**)&_byteArrayKlassObj);
229 f->do_ptr((void**)&_charArrayKlassObj);
230 f->do_ptr((void**)&_intArrayKlassObj);
231 f->do_ptr((void**)&_shortArrayKlassObj);
232 f->do_ptr((void**)&_longArrayKlassObj);
233 f->do_ptr((void**)&_singleArrayKlassObj);
234 f->do_ptr((void**)&_doubleArrayKlassObj);
235 f->do_ptr((void**)&_objectArrayKlassObj);
236
237 {
238 for (int i = 0; i < T_VOID+1; i++) {
239 if (_typeArrayKlassObjs[i] != NULL) {
240 assert(i >= T_BOOLEAN, "checking");
241 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
242 } else if (do_all) {
243 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
244 }
245 }
246 }
247
248 f->do_ptr((void**)&_the_array_interfaces_array);
249 f->do_ptr((void**)&_the_empty_int_array);
250 f->do_ptr((void**)&_the_empty_short_array);
251 f->do_ptr((void**)&_the_empty_method_array);
252 f->do_ptr((void**)&_the_empty_klass_array);
253 _finalizer_register_cache->serialize(f);
254 _loader_addClass_cache->serialize(f);
255 _pd_implies_cache->serialize(f);
256 _throw_illegal_access_error_cache->serialize(f);
257 _do_stack_walk_cache->serialize(f);
258 }
259
260 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
261 if (size < alignment || size % alignment != 0) {
262 vm_exit_during_initialization(
263 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
264 }
265 }
266
267 void initialize_basic_type_klass(Klass* k, TRAPS) {
268 Klass* ok = SystemDictionary::Object_klass();
269 if (UseSharedSpaces) {
270 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
271 assert(k->super() == ok, "u3");
272 k->restore_unshareable_info(loader_data, Handle(), CHECK);
273 } else {
274 k->initialize_supers(ok, CHECK);
275 }
276 k->append_to_sibling_list();
277 }
278
279 void Universe::genesis(TRAPS) {
280 ResourceMark rm;
281
282 { FlagSetting fs(_bootstrapping, true);
283
284 { MutexLocker mc(Compile_lock);
285
286 // determine base vtable size; without that we cannot create the array klasses
287 compute_base_vtable_size();
288
289 if (!UseSharedSpaces) {
290 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK);
291 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK);
292 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK);
293 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK);
294 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK);
295 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK);
296 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK);
297 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK);
298
299 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj;
300 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj;
301 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj;
302 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj;
303 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj;
304 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj;
305 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj;
306 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj;
307
308 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
309
310 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
311 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
312 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
313 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
314 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
315 }
316 }
317
318 vmSymbols::initialize(CHECK);
319
320 SystemDictionary::initialize(CHECK);
321
322 Klass* ok = SystemDictionary::Object_klass();
323
324 _the_null_string = StringTable::intern("null", CHECK);
325 _the_min_jint_string = StringTable::intern("-2147483648", CHECK);
326
327 if (UseSharedSpaces) {
328 // Verify shared interfaces array.
329 assert(_the_array_interfaces_array->at(0) ==
330 SystemDictionary::Cloneable_klass(), "u3");
331 assert(_the_array_interfaces_array->at(1) ==
332 SystemDictionary::Serializable_klass(), "u3");
333 MetaspaceShared::fixup_shared_string_regions();
334 } else {
335 // Set up shared interfaces array. (Do this before supers are set up.)
336 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
337 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
338 }
339
340 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
341 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
342 initialize_basic_type_klass(singleArrayKlassObj(), CHECK);
343 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
344 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
345 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
346 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
347 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
348 } // end of core bootstrapping
349
350 // Maybe this could be lifted up now that object array can be initialized
351 // during the bootstrapping.
352
353 // OLD
354 // Initialize _objectArrayKlass after core bootstraping to make
355 // sure the super class is set up properly for _objectArrayKlass.
356 // ---
357 // NEW
358 // Since some of the old system object arrays have been converted to
359 // ordinary object arrays, _objectArrayKlass will be loaded when
360 // SystemDictionary::initialize(CHECK); is run. See the extra check
361 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
362 _objectArrayKlassObj = InstanceKlass::
363 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
364 // OLD
365 // Add the class to the class hierarchy manually to make sure that
366 // its vtable is initialized after core bootstrapping is completed.
367 // ---
368 // New
369 // Have already been initialized.
370 _objectArrayKlassObj->append_to_sibling_list();
371
372 #ifdef ASSERT
373 if (FullGCALot) {
374 // Allocate an array of dummy objects.
375 // We'd like these to be at the bottom of the old generation,
376 // so that when we free one and then collect,
377 // (almost) the whole heap moves
378 // and we find out if we actually update all the oops correctly.
379 // But we can't allocate directly in the old generation,
380 // so we allocate wherever, and hope that the first collection
381 // moves these objects to the bottom of the old generation.
382 // We can allocate directly in the permanent generation, so we do.
383 int size;
384 if (UseConcMarkSweepGC) {
385 log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate");
386 size = FullGCALotDummies;
387 } else {
388 size = FullGCALotDummies * 2;
389 }
390 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
391 objArrayHandle dummy_array(THREAD, naked_array);
392 int i = 0;
393 while (i < size) {
394 // Allocate dummy in old generation
395 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK);
396 dummy_array->obj_at_put(i++, dummy);
397 }
398 {
399 // Only modify the global variable inside the mutex.
400 // If we had a race to here, the other dummy_array instances
401 // and their elements just get dropped on the floor, which is fine.
402 MutexLocker ml(FullGCALot_lock);
403 if (_fullgc_alot_dummy_array == NULL) {
404 _fullgc_alot_dummy_array = dummy_array();
405 }
406 }
407 assert(i == _fullgc_alot_dummy_array->length(), "just checking");
408 }
409 #endif
410
411 // Initialize dependency array for null class loader
412 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK);
413
414 }
415
416 void Universe::initialize_basic_type_mirrors(TRAPS) {
417 assert(_int_mirror==NULL, "basic type mirrors already initialized");
418 _int_mirror =
419 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK);
420 _float_mirror =
421 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK);
422 _double_mirror =
423 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK);
424 _byte_mirror =
425 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK);
426 _bool_mirror =
427 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
428 _char_mirror =
429 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK);
430 _long_mirror =
431 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK);
432 _short_mirror =
433 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK);
434 _void_mirror =
435 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK);
436
437 _mirrors[T_INT] = _int_mirror;
438 _mirrors[T_FLOAT] = _float_mirror;
439 _mirrors[T_DOUBLE] = _double_mirror;
440 _mirrors[T_BYTE] = _byte_mirror;
441 _mirrors[T_BOOLEAN] = _bool_mirror;
442 _mirrors[T_CHAR] = _char_mirror;
443 _mirrors[T_LONG] = _long_mirror;
444 _mirrors[T_SHORT] = _short_mirror;
445 _mirrors[T_VOID] = _void_mirror;
446 //_mirrors[T_OBJECT] = _object_klass->java_mirror();
447 //_mirrors[T_ARRAY] = _object_klass->java_mirror();
448 }
449
450 void Universe::fixup_mirrors(TRAPS) {
451 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
452 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
453 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
454 // that the number of objects allocated at this point is very small.
455 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
456 HandleMark hm(THREAD);
457 // Cache the start of the static fields
458 InstanceMirrorKlass::init_offset_of_static_fields();
459
460 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
461 int list_length = list->length();
462 for (int i = 0; i < list_length; i++) {
463 Klass* k = list->at(i);
464 assert(k->is_klass(), "List should only hold classes");
465 EXCEPTION_MARK;
466 java_lang_Class::fixup_mirror(k, CATCH);
467 }
468 delete java_lang_Class::fixup_mirror_list();
469 java_lang_Class::set_fixup_mirror_list(NULL);
470 }
471
472 #define assert_pll_locked(test) \
473 assert(Heap_lock->test(), "Reference pending list access requires lock")
474
475 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
476
477 oop Universe::reference_pending_list() {
478 assert_pll_ownership();
479 return _reference_pending_list;
480 }
481
482 void Universe::set_reference_pending_list(oop list) {
483 assert_pll_ownership();
484 _reference_pending_list = list;
485 }
486
487 bool Universe::has_reference_pending_list() {
488 assert_pll_ownership();
489 return _reference_pending_list != NULL;
490 }
491
492 oop Universe::swap_reference_pending_list(oop list) {
493 assert_pll_locked(is_locked);
494 return (oop)Atomic::xchg_ptr(list, &_reference_pending_list);
495 }
496
497 #undef assert_pll_locked
498 #undef assert_pll_ownership
499
500
501 static bool has_run_finalizers_on_exit = false;
502
503 void Universe::run_finalizers_on_exit() {
504 if (has_run_finalizers_on_exit) return;
505 has_run_finalizers_on_exit = true;
506
507 // Called on VM exit. This ought to be run in a separate thread.
508 log_trace(ref)("Callback to run finalizers on exit");
509 {
510 PRESERVE_EXCEPTION_MARK;
511 Klass* finalizer_klass = SystemDictionary::Finalizer_klass();
512 JavaValue result(T_VOID);
513 JavaCalls::call_static(
514 &result,
515 finalizer_klass,
516 vmSymbols::run_finalizers_on_exit_name(),
517 vmSymbols::void_method_signature(),
518 THREAD
519 );
520 // Ignore any pending exceptions
521 CLEAR_PENDING_EXCEPTION;
522 }
523 }
524
525
526 // initialize_vtable could cause gc if
527 // 1) we specified true to initialize_vtable and
528 // 2) this ran after gc was enabled
529 // In case those ever change we use handles for oops
530 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) {
531 // init vtable of k and all subclasses
532 ko->vtable().initialize_vtable(false, CHECK);
533 if (ko->is_instance_klass()) {
534 for (Klass* sk = ko->subklass();
535 sk != NULL;
536 sk = sk->next_sibling()) {
537 reinitialize_vtable_of(sk, CHECK);
538 }
539 }
540 }
541
542
543 void initialize_itable_for_klass(Klass* k, TRAPS) {
544 InstanceKlass::cast(k)->itable().initialize_itable(false, CHECK);
545 }
546
547
548 void Universe::reinitialize_itables(TRAPS) {
549 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK);
550
551 }
552
553
554 bool Universe::on_page_boundary(void* addr) {
555 return ((uintptr_t) addr) % os::vm_page_size() == 0;
556 }
557
558
559 bool Universe::should_fill_in_stack_trace(Handle throwable) {
560 // never attempt to fill in the stack trace of preallocated errors that do not have
561 // backtrace. These errors are kept alive forever and may be "re-used" when all
562 // preallocated errors with backtrace have been consumed. Also need to avoid
563 // a potential loop which could happen if an out of memory occurs when attempting
564 // to allocate the backtrace.
565 return ((throwable() != Universe::_out_of_memory_error_java_heap) &&
566 (throwable() != Universe::_out_of_memory_error_metaspace) &&
567 (throwable() != Universe::_out_of_memory_error_class_metaspace) &&
568 (throwable() != Universe::_out_of_memory_error_array_size) &&
569 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) &&
570 (throwable() != Universe::_out_of_memory_error_realloc_objects));
571 }
572
573
574 oop Universe::gen_out_of_memory_error(oop default_err) {
575 // generate an out of memory error:
576 // - if there is a preallocated error and stack traces are available
577 // (j.l.Throwable is initialized), then return the preallocated
578 // error with a filled in stack trace, and with the message
579 // provided by the default error.
580 // - otherwise, return the default error, without a stack trace.
581 int next;
582 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
583 SystemDictionary::Throwable_klass()->is_initialized()) {
584 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);
585 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
586 } else {
587 next = -1;
588 }
589 if (next < 0) {
590 // all preallocated errors have been used.
591 // return default
592 return default_err;
593 } else {
594 Thread* THREAD = Thread::current();
595 Handle default_err_h(THREAD, default_err);
596 // get the error object at the slot and set set it to NULL so that the
597 // array isn't keeping it alive anymore.
598 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next));
599 assert(exc() != NULL, "slot has been used already");
600 preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
601
602 // use the message from the default error
603 oop msg = java_lang_Throwable::message(default_err_h());
604 assert(msg != NULL, "no message");
605 java_lang_Throwable::set_message(exc(), msg);
606
607 // populate the stack trace and return it.
608 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
609 return exc();
610 }
611 }
612
613 intptr_t Universe::_non_oop_bits = 0;
614
615 void* Universe::non_oop_word() {
616 // Neither the high bits nor the low bits of this value is allowed
617 // to look like (respectively) the high or low bits of a real oop.
618 //
619 // High and low are CPU-specific notions, but low always includes
620 // the low-order bit. Since oops are always aligned at least mod 4,
621 // setting the low-order bit will ensure that the low half of the
622 // word will never look like that of a real oop.
623 //
624 // Using the OS-supplied non-memory-address word (usually 0 or -1)
625 // will take care of the high bits, however many there are.
626
627 if (_non_oop_bits == 0) {
628 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
629 }
630
631 return (void*)_non_oop_bits;
632 }
633
634 jint universe_init() {
635 assert(!Universe::_fully_initialized, "called after initialize_vtables");
636 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
637 "LogHeapWordSize is incorrect.");
638 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
639 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
640 "oop size is not not a multiple of HeapWord size");
641
642 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
643
644 JavaClasses::compute_hard_coded_offsets();
645
646 jint status = Universe::initialize_heap();
647 if (status != JNI_OK) {
648 return status;
649 }
650
651 Metaspace::global_initialize();
652
653 AOTLoader::universe_init();
654
655 // Checks 'AfterMemoryInit' constraints.
656 if (!CommandLineFlagConstraintList::check_constraints(CommandLineFlagConstraint::AfterMemoryInit)) {
657 return JNI_EINVAL;
658 }
659
660 // Create memory for metadata. Must be after initializing heap for
661 // DumpSharedSpaces.
662 ClassLoaderData::init_null_class_loader_data();
663
664 // We have a heap so create the Method* caches before
665 // Metaspace::initialize_shared_spaces() tries to populate them.
666 Universe::_finalizer_register_cache = new LatestMethodCache();
667 Universe::_loader_addClass_cache = new LatestMethodCache();
668 Universe::_pd_implies_cache = new LatestMethodCache();
669 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
670 Universe::_do_stack_walk_cache = new LatestMethodCache();
671
672 if (UseSharedSpaces) {
673 // Read the data structures supporting the shared spaces (shared
674 // system dictionary, symbol table, etc.). After that, access to
675 // the file (other than the mapped regions) is no longer needed, and
676 // the file is closed. Closing the file does not affect the
677 // currently mapped regions.
678 MetaspaceShared::initialize_shared_spaces();
679 StringTable::create_table();
680 } else {
681 SymbolTable::create_table();
682 StringTable::create_table();
683
684 if (DumpSharedSpaces) {
685 MetaspaceShared::prepare_for_dumping();
686 }
687 }
688 if (strlen(VerifySubSet) > 0) {
689 Universe::initialize_verify_flags();
690 }
691
692 ResolvedMethodTable::create_table();
693
694 return JNI_OK;
695 }
696
697 CollectedHeap* Universe::create_heap() {
698 assert(_collectedHeap == NULL, "Heap already created");
699 #if !INCLUDE_ALL_GCS
700 if (UseParallelGC) {
701 fatal("UseParallelGC not supported in this VM.");
702 } else if (UseG1GC) {
703 fatal("UseG1GC not supported in this VM.");
704 } else if (UseConcMarkSweepGC) {
705 fatal("UseConcMarkSweepGC not supported in this VM.");
706 #else
707 if (UseParallelGC) {
708 return Universe::create_heap_with_policy<ParallelScavengeHeap, GenerationSizer>();
709 } else if (UseG1GC) {
710 return Universe::create_heap_with_policy<G1CollectedHeap, G1CollectorPolicy>();
711 } else if (UseConcMarkSweepGC) {
712 return Universe::create_heap_with_policy<GenCollectedHeap, ConcurrentMarkSweepPolicy>();
713 #endif
714 } else if (UseSerialGC) {
715 return Universe::create_heap_with_policy<GenCollectedHeap, MarkSweepPolicy>();
716 }
717
718 ShouldNotReachHere();
719 return NULL;
720 }
721
722 // Choose the heap base address and oop encoding mode
723 // when compressed oops are used:
724 // Unscaled - Use 32-bits oops without encoding when
725 // NarrowOopHeapBaseMin + heap_size < 4Gb
726 // ZeroBased - Use zero based compressed oops with encoding when
727 // NarrowOopHeapBaseMin + heap_size < 32Gb
728 // HeapBased - Use compressed oops with heap base + encoding.
729
730 jint Universe::initialize_heap() {
731 jint status = JNI_ERR;
732
733 _collectedHeap = create_heap_ext();
734 if (_collectedHeap == NULL) {
735 _collectedHeap = create_heap();
736 }
737
738 status = _collectedHeap->initialize();
739 if (status != JNI_OK) {
740 return status;
741 }
742 log_info(gc)("Using %s", _collectedHeap->name());
743
744 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
745
746 #ifdef _LP64
747 if (UseCompressedOops) {
748 // Subtract a page because something can get allocated at heap base.
749 // This also makes implicit null checking work, because the
750 // memory+1 page below heap_base needs to cause a signal.
751 // See needs_explicit_null_check.
752 // Only set the heap base for compressed oops because it indicates
753 // compressed oops for pstack code.
754 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) {
755 // Didn't reserve heap below 4Gb. Must shift.
756 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
757 }
758 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) {
759 // Did reserve heap below 32Gb. Can use base == 0;
760 Universe::set_narrow_oop_base(0);
761 }
762
763 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base());
764
765 if (log_is_enabled(Info, gc, heap, coops)) {
766 ResourceMark rm;
767 outputStream* logst = Log(gc, heap, coops)::info_stream();
768 Universe::print_compressed_oops_mode(logst);
769 }
770
771 // Tell tests in which mode we run.
772 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode",
773 narrow_oop_mode_to_string(narrow_oop_mode()),
774 false));
775 }
776 // Universe::narrow_oop_base() is one page below the heap.
777 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() -
778 os::vm_page_size()) ||
779 Universe::narrow_oop_base() == NULL, "invalid value");
780 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes ||
781 Universe::narrow_oop_shift() == 0, "invalid value");
782 #endif
783
784 // We will never reach the CATCH below since Exceptions::_throw will cause
785 // the VM to exit if an exception is thrown during initialization
786
787 if (UseTLAB) {
788 assert(Universe::heap()->supports_tlab_allocation(),
789 "Should support thread-local allocation buffers");
790 ThreadLocalAllocBuffer::startup_initialization();
791 }
792 return JNI_OK;
793 }
794
795 void Universe::print_compressed_oops_mode(outputStream* st) {
796 st->print("Heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
797 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M);
798
799 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode()));
800
801 if (Universe::narrow_oop_base() != 0) {
802 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base()));
803 }
804
805 if (Universe::narrow_oop_shift() != 0) {
806 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
807 }
808
809 if (!Universe::narrow_oop_use_implicit_null_checks()) {
810 st->print(", no protected page in front of the heap");
811 }
812 st->cr();
813 }
814
815 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
816
817 assert(alignment <= Arguments::conservative_max_heap_alignment(),
818 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
819 alignment, Arguments::conservative_max_heap_alignment());
820
821 size_t total_reserved = align_size_up(heap_size, alignment);
822 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
823 "heap size is too big for compressed oops");
824
825 bool use_large_pages = UseLargePages && is_size_aligned(alignment, os::large_page_size());
826 assert(!UseLargePages
827 || UseParallelGC
828 || use_large_pages, "Wrong alignment to use large pages");
829
830 // Now create the space.
831 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages);
832
833 if (total_rs.is_reserved()) {
834 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
835 "must be exactly of required size and alignment");
836 // We are good.
837
838 if (UseCompressedOops) {
839 // Universe::initialize_heap() will reset this to NULL if unscaled
840 // or zero-based narrow oops are actually used.
841 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
842 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
843 }
844
845 return total_rs;
846 }
847
848 vm_exit_during_initialization(
849 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
850 total_reserved/K));
851
852 // satisfy compiler
853 ShouldNotReachHere();
854 return ReservedHeapSpace(0, 0, false);
855 }
856
857
858 // It's the caller's responsibility to ensure glitch-freedom
859 // (if required).
860 void Universe::update_heap_info_at_gc() {
861 _heap_capacity_at_last_gc = heap()->capacity();
862 _heap_used_at_last_gc = heap()->used();
863 }
864
865
866 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) {
867 switch (mode) {
868 case UnscaledNarrowOop:
869 return "32-bit";
870 case ZeroBasedNarrowOop:
871 return "Zero based";
872 case DisjointBaseNarrowOop:
873 return "Non-zero disjoint base";
874 case HeapBasedNarrowOop:
875 return "Non-zero based";
876 default:
877 ShouldNotReachHere();
878 return "";
879 }
880 }
881
882
883 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() {
884 if (narrow_oop_base_disjoint()) {
885 return DisjointBaseNarrowOop;
886 }
887
888 if (narrow_oop_base() != 0) {
889 return HeapBasedNarrowOop;
890 }
891
892 if (narrow_oop_shift() != 0) {
893 return ZeroBasedNarrowOop;
894 }
895
896 return UnscaledNarrowOop;
897 }
898
899 void initialize_known_method(LatestMethodCache* method_cache,
900 InstanceKlass* ik,
901 const char* method,
902 Symbol* signature,
903 bool is_static, TRAPS)
904 {
905 TempNewSymbol name = SymbolTable::new_symbol(method, CHECK);
906 Method* m = NULL;
907 // The klass must be linked before looking up the method.
908 if (!ik->link_class_or_fail(THREAD) ||
909 ((m = ik->find_method(name, signature)) == NULL) ||
910 is_static != m->is_static()) {
911 ResourceMark rm(THREAD);
912 // NoSuchMethodException doesn't actually work because it tries to run the
913 // <init> function before java_lang_Class is linked. Print error and exit.
914 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
915 ik->name()->as_C_string(), method));
916 }
917 method_cache->init(ik, m);
918 }
919
920 void Universe::initialize_known_methods(TRAPS) {
921 // Set up static method for registering finalizers
922 initialize_known_method(_finalizer_register_cache,
923 SystemDictionary::Finalizer_klass(),
924 "register",
925 vmSymbols::object_void_signature(), true, CHECK);
926
927 initialize_known_method(_throw_illegal_access_error_cache,
928 SystemDictionary::internal_Unsafe_klass(),
929 "throwIllegalAccessError",
930 vmSymbols::void_method_signature(), true, CHECK);
931
932 // Set up method for registering loaded classes in class loader vector
933 initialize_known_method(_loader_addClass_cache,
934 SystemDictionary::ClassLoader_klass(),
935 "addClass",
936 vmSymbols::class_void_signature(), false, CHECK);
937
938 // Set up method for checking protection domain
939 initialize_known_method(_pd_implies_cache,
940 SystemDictionary::ProtectionDomain_klass(),
941 "impliesCreateAccessControlContext",
942 vmSymbols::void_boolean_signature(), false, CHECK);
943
944 // Set up method for stack walking
945 initialize_known_method(_do_stack_walk_cache,
946 SystemDictionary::AbstractStackWalker_klass(),
947 "doStackWalk",
948 vmSymbols::doStackWalk_signature(), false, CHECK);
949 }
950
951 void universe2_init() {
952 EXCEPTION_MARK;
953 Universe::genesis(CATCH);
954 }
955
956 // Set after initialization of the module runtime, call_initModuleRuntime
957 void universe_post_module_init() {
958 Universe::_module_initialized = true;
959 }
960
961 bool universe_post_init() {
962 assert(!is_init_completed(), "Error: initialization not yet completed!");
963 Universe::_fully_initialized = true;
964 EXCEPTION_MARK;
965 { ResourceMark rm;
966 Interpreter::initialize(); // needed for interpreter entry points
967 if (!UseSharedSpaces) {
968 HandleMark hm(THREAD);
969 Klass* ok = SystemDictionary::Object_klass();
970 Universe::reinitialize_vtable_of(ok, CHECK_false);
971 Universe::reinitialize_itables(CHECK_false);
972 }
973 }
974
975 HandleMark hm(THREAD);
976 // Setup preallocated empty java.lang.Class array
977 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
978
979 // Setup preallocated OutOfMemoryError errors
980 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
981 InstanceKlass* ik = InstanceKlass::cast(k);
982 Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false);
983 Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false);
984 Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false);
985 Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false);
986 Universe::_out_of_memory_error_gc_overhead_limit =
987 ik->allocate_instance(CHECK_false);
988 Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false);
989
990 // Setup preallocated cause message for delayed StackOverflowError
991 if (StackReservedPages > 0) {
992 Universe::_delayed_stack_overflow_error_message =
993 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
994 }
995
996 // Setup preallocated NullPointerException
997 // (this is currently used for a cheap & dirty solution in compiler exception handling)
998 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
999 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1000 // Setup preallocated ArithmeticException
1001 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1002 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
1003 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1004 // Virtual Machine Error for when we get into a situation we can't resolve
1005 k = SystemDictionary::resolve_or_fail(
1006 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
1007 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1008 if (!linked) {
1009 tty->print_cr("Unable to link/verify VirtualMachineError class");
1010 return false; // initialization failed
1011 }
1012 Universe::_virtual_machine_error_instance =
1013 InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1014
1015 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1016
1017 if (!DumpSharedSpaces) {
1018 // These are the only Java fields that are currently set during shared space dumping.
1019 // We prefer to not handle this generally, so we always reinitialize these detail messages.
1020 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
1021 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
1022
1023 msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
1024 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
1025 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
1026 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
1027
1028 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
1029 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
1030
1031 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
1032 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
1033
1034 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false);
1035 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg());
1036
1037 msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1038 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
1039
1040 // Setup the array of errors that have preallocated backtrace
1041 k = Universe::_out_of_memory_error_java_heap->klass();
1042 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
1043 ik = InstanceKlass::cast(k);
1044
1045 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
1046 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false);
1047 for (int i=0; i<len; i++) {
1048 oop err = ik->allocate_instance(CHECK_false);
1049 Handle err_h = Handle(THREAD, err);
1050 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
1051 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
1052 }
1053 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
1054 }
1055
1056 Universe::initialize_known_methods(CHECK_false);
1057
1058 // This needs to be done before the first scavenge/gc, since
1059 // it's an input to soft ref clearing policy.
1060 {
1061 MutexLocker x(Heap_lock);
1062 Universe::update_heap_info_at_gc();
1063 }
1064
1065 // ("weak") refs processing infrastructure initialization
1066 Universe::heap()->post_initialize();
1067
1068 // Initialize performance counters for metaspaces
1069 MetaspaceCounters::initialize_performance_counters();
1070 CompressedClassSpaceCounters::initialize_performance_counters();
1071
1072 MemoryService::add_metaspace_memory_pools();
1073
1074 MemoryService::set_universe_heap(Universe::heap());
1075 #if INCLUDE_CDS
1076 SharedClassUtil::initialize(CHECK_false);
1077 #endif
1078 return true;
1079 }
1080
1081
1082 void Universe::compute_base_vtable_size() {
1083 _base_vtable_size = ClassLoader::compute_Object_vtable();
1084 }
1085
1086 void Universe::print_on(outputStream* st) {
1087 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1088 st->print_cr("Heap");
1089 heap()->print_on(st);
1090 }
1091
1092 void Universe::print_heap_at_SIGBREAK() {
1093 if (PrintHeapAtSIGBREAK) {
1094 print_on(tty);
1095 tty->cr();
1096 tty->flush();
1097 }
1098 }
1099
1100 void Universe::print_heap_before_gc() {
1101 Log(gc, heap) log;
1102 if (log.is_debug()) {
1103 log.debug("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1104 ResourceMark rm;
1105 heap()->print_on(log.debug_stream());
1106 }
1107 }
1108
1109 void Universe::print_heap_after_gc() {
1110 Log(gc, heap) log;
1111 if (log.is_debug()) {
1112 log.debug("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1113 ResourceMark rm;
1114 heap()->print_on(log.debug_stream());
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