rev 60538 : imported patch jep387-all.patch
1 /*
2 * Copyright (c) 1997, 2020, 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/classLoaderDataGraph.hpp"
29 #include "classfile/javaClasses.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/symbolTable.hpp"
32 #include "classfile/systemDictionary.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "code/codeBehaviours.hpp"
35 #include "code/codeCache.hpp"
36 #include "gc/shared/collectedHeap.inline.hpp"
37 #include "gc/shared/gcArguments.hpp"
38 #include "gc/shared/gcConfig.hpp"
39 #include "gc/shared/gcLogPrecious.hpp"
40 #include "gc/shared/gcTraceTime.inline.hpp"
41 #include "gc/shared/oopStorageSet.hpp"
42 #include "logging/log.hpp"
43 #include "logging/logStream.hpp"
44 #include "memory/heapShared.hpp"
45 #include "memory/metadataFactory.hpp"
46 #include "memory/metaspaceClosure.hpp"
47 #include "memory/metaspaceCounters.hpp"
48 #include "memory/metaspaceShared.hpp"
49 #include "memory/oopFactory.hpp"
50 #include "memory/resourceArea.hpp"
51 #include "memory/universe.hpp"
52 #include "oops/compressedOops.hpp"
53 #include "oops/instanceKlass.hpp"
54 #include "oops/instanceMirrorKlass.hpp"
55 #include "oops/objArrayOop.inline.hpp"
56 #include "oops/oop.inline.hpp"
57 #include "oops/oopHandle.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/flags/jvmFlagConstraintList.hpp"
63 #include "runtime/handles.inline.hpp"
64 #include "runtime/init.hpp"
65 #include "runtime/java.hpp"
66 #include "runtime/thread.inline.hpp"
67 #include "runtime/timerTrace.hpp"
68 #include "services/memoryService.hpp"
69 #include "utilities/align.hpp"
70 #include "utilities/autoRestore.hpp"
71 #include "utilities/debug.hpp"
72 #include "utilities/formatBuffer.hpp"
73 #include "utilities/macros.hpp"
74 #include "utilities/ostream.hpp"
75 #include "utilities/preserveException.hpp"
76
77 // Known objects
78 Klass* Universe::_typeArrayKlassObjs[T_LONG+1] = { NULL /*, NULL...*/ };
79 Klass* Universe::_objectArrayKlassObj = NULL;
80 OopHandle Universe::_mirrors[T_VOID+1];
81
82 OopHandle Universe::_main_thread_group;
83 OopHandle Universe::_system_thread_group;
84 OopHandle Universe::_the_empty_class_array;
85 OopHandle Universe::_the_null_string;
86 OopHandle Universe::_the_min_jint_string;
87
88 OopHandle Universe::_the_null_sentinel;
89
90 // _out_of_memory_errors is an objArray
91 enum OutOfMemoryInstance { _oom_java_heap,
92 _oom_c_heap,
93 _oom_metaspace,
94 _oom_class_metaspace,
95 _oom_array_size,
96 _oom_gc_overhead_limit,
97 _oom_realloc_objects,
98 _oom_retry,
99 _oom_count };
100
101 OopHandle Universe::_out_of_memory_errors;
102 OopHandle Universe::_delayed_stack_overflow_error_message;
103 OopHandle Universe::_preallocated_out_of_memory_error_array;
104 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
105
106 OopHandle Universe::_null_ptr_exception_instance;
107 OopHandle Universe::_arithmetic_exception_instance;
108 OopHandle Universe::_virtual_machine_error_instance;
109
110 OopHandle Universe::_reference_pending_list;
111
112 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
113 LatestMethodCache* Universe::_finalizer_register_cache = NULL;
114 LatestMethodCache* Universe::_loader_addClass_cache = NULL;
115 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL;
116 LatestMethodCache* Universe::_throw_no_such_method_error_cache = NULL;
117 LatestMethodCache* Universe::_do_stack_walk_cache = NULL;
118
119 bool Universe::_verify_in_progress = false;
120 long Universe::verify_flags = Universe::Verify_All;
121
122 Array<int>* Universe::_the_empty_int_array = NULL;
123 Array<u2>* Universe::_the_empty_short_array = NULL;
124 Array<Klass*>* Universe::_the_empty_klass_array = NULL;
125 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = NULL;
126 Array<Method*>* Universe::_the_empty_method_array = NULL;
127
128 // These variables are guarded by FullGCALot_lock.
129 debug_only(OopHandle Universe::_fullgc_alot_dummy_array;)
130 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
131
132 // Heap
133 int Universe::_verify_count = 0;
134
135 // Oop verification (see MacroAssembler::verify_oop)
136 uintptr_t Universe::_verify_oop_mask = 0;
137 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
138
139 int Universe::_base_vtable_size = 0;
140 bool Universe::_bootstrapping = false;
141 bool Universe::_module_initialized = false;
142 bool Universe::_fully_initialized = false;
143
144 size_t Universe::_heap_capacity_at_last_gc;
145 size_t Universe::_heap_used_at_last_gc = 0;
146
147 OopStorage* Universe::_vm_weak = NULL;
148 OopStorage* Universe::_vm_global = NULL;
149
150 CollectedHeap* Universe::_collectedHeap = NULL;
151
152 objArrayOop Universe::the_empty_class_array () {
153 return (objArrayOop)_the_empty_class_array.resolve();
154 }
155
156 oop Universe::main_thread_group() { return _main_thread_group.resolve(); }
157 void Universe::set_main_thread_group(oop group) { _main_thread_group = OopHandle(vm_global(), group); }
158
159 oop Universe::system_thread_group() { return _system_thread_group.resolve(); }
160 void Universe::set_system_thread_group(oop group) { _system_thread_group = OopHandle(vm_global(), group); }
161
162 oop Universe::the_null_string() { return _the_null_string.resolve(); }
163 oop Universe::the_min_jint_string() { return _the_min_jint_string.resolve(); }
164
165 oop Universe::null_ptr_exception_instance() { return _null_ptr_exception_instance.resolve(); }
166 oop Universe::arithmetic_exception_instance() { return _arithmetic_exception_instance.resolve(); }
167 oop Universe::virtual_machine_error_instance() { return _virtual_machine_error_instance.resolve(); }
168
169 oop Universe::the_null_sentinel() { return _the_null_sentinel.resolve(); }
170
171 oop Universe::int_mirror() { return check_mirror(_mirrors[T_INT].resolve()); }
172 oop Universe::float_mirror() { return check_mirror(_mirrors[T_FLOAT].resolve()); }
173 oop Universe::double_mirror() { return check_mirror(_mirrors[T_DOUBLE].resolve()); }
174 oop Universe::byte_mirror() { return check_mirror(_mirrors[T_BYTE].resolve()); }
175 oop Universe::bool_mirror() { return check_mirror(_mirrors[T_BOOLEAN].resolve()); }
176 oop Universe::char_mirror() { return check_mirror(_mirrors[T_CHAR].resolve()); }
177 oop Universe::long_mirror() { return check_mirror(_mirrors[T_LONG].resolve()); }
178 oop Universe::short_mirror() { return check_mirror(_mirrors[T_SHORT].resolve()); }
179 oop Universe::void_mirror() { return check_mirror(_mirrors[T_VOID].resolve()); }
180
181 oop Universe::java_mirror(BasicType t) {
182 assert((uint)t < T_VOID+1, "range check");
183 return check_mirror(_mirrors[t].resolve());
184 }
185
186 // Used by CDS dumping
187 void Universe::replace_mirror(BasicType t, oop new_mirror) {
188 Universe::_mirrors[t].replace(new_mirror);
189 }
190
191 // Not sure why CDS has to do this
192 void Universe::clear_basic_type_mirrors() {
193 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
194 if (!is_reference_type((BasicType)i)) {
195 Universe::_mirrors[i].replace(NULL);
196 }
197 }
198 }
199
200 void Universe::basic_type_classes_do(void f(Klass*)) {
201 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
202 f(_typeArrayKlassObjs[i]);
203 }
204 }
205
206 void Universe::basic_type_classes_do(KlassClosure *closure) {
207 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
208 closure->do_klass(_typeArrayKlassObjs[i]);
209 }
210 }
211
212 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
213 it->push(&_klass);
214 }
215
216 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
217 for (int i = 0; i < T_LONG+1; i++) {
218 it->push(&_typeArrayKlassObjs[i]);
219 }
220 it->push(&_objectArrayKlassObj);
221
222 it->push(&_the_empty_int_array);
223 it->push(&_the_empty_short_array);
224 it->push(&_the_empty_klass_array);
225 it->push(&_the_empty_instance_klass_array);
226 it->push(&_the_empty_method_array);
227 it->push(&_the_array_interfaces_array);
228
229 _finalizer_register_cache->metaspace_pointers_do(it);
230 _loader_addClass_cache->metaspace_pointers_do(it);
231 _throw_illegal_access_error_cache->metaspace_pointers_do(it);
232 _throw_no_such_method_error_cache->metaspace_pointers_do(it);
233 _do_stack_walk_cache->metaspace_pointers_do(it);
234 }
235
236 // Serialize metadata and pointers to primitive type mirrors in and out of CDS archive
237 void Universe::serialize(SerializeClosure* f) {
238
239 #if INCLUDE_CDS_JAVA_HEAP
240 {
241 oop mirror_oop;
242 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
243 if (f->reading()) {
244 f->do_oop(&mirror_oop); // read from archive
245 assert(oopDesc::is_oop_or_null(mirror_oop), "is oop");
246 // Only create an OopHandle for non-null mirrors
247 if (mirror_oop != NULL) {
248 _mirrors[i] = OopHandle(vm_global(), mirror_oop);
249 }
250 } else {
251 mirror_oop = _mirrors[i].resolve();
252 f->do_oop(&mirror_oop); // write to archive
253 }
254 if (mirror_oop != NULL) { // may be null if archived heap is disabled
255 java_lang_Class::update_archived_primitive_mirror_native_pointers(mirror_oop);
256 }
257 }
258 }
259 #endif
260
261 for (int i = 0; i < T_LONG+1; i++) {
262 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
263 }
264
265 f->do_ptr((void**)&_objectArrayKlassObj);
266 f->do_ptr((void**)&_the_array_interfaces_array);
267 f->do_ptr((void**)&_the_empty_int_array);
268 f->do_ptr((void**)&_the_empty_short_array);
269 f->do_ptr((void**)&_the_empty_method_array);
270 f->do_ptr((void**)&_the_empty_klass_array);
271 f->do_ptr((void**)&_the_empty_instance_klass_array);
272 _finalizer_register_cache->serialize(f);
273 _loader_addClass_cache->serialize(f);
274 _throw_illegal_access_error_cache->serialize(f);
275 _throw_no_such_method_error_cache->serialize(f);
276 _do_stack_walk_cache->serialize(f);
277 }
278
279
280 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
281 if (size < alignment || size % alignment != 0) {
282 vm_exit_during_initialization(
283 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
284 }
285 }
286
287 void initialize_basic_type_klass(Klass* k, TRAPS) {
288 Klass* ok = SystemDictionary::Object_klass();
289 #if INCLUDE_CDS
290 if (UseSharedSpaces) {
291 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
292 assert(k->super() == ok, "u3");
293 if (k->is_instance_klass()) {
294 InstanceKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), NULL, CHECK);
295 } else {
296 ArrayKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), CHECK);
297 }
298 } else
299 #endif
300 {
301 k->initialize_supers(ok, NULL, CHECK);
302 }
303 k->append_to_sibling_list();
304 }
305
306 void Universe::genesis(TRAPS) {
307 ResourceMark rm(THREAD);
308 HandleMark hm(THREAD);
309
310 { AutoModifyRestore<bool> temporarily(_bootstrapping, true);
311
312 { MutexLocker mc(THREAD, Compile_lock);
313
314 java_lang_Class::allocate_fixup_lists();
315
316 // determine base vtable size; without that we cannot create the array klasses
317 compute_base_vtable_size();
318
319 if (!UseSharedSpaces) {
320 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
321 _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK);
322 }
323
324 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
325
326 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
327 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
328 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
329 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
330 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
331 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK);
332 }
333 }
334
335 vmSymbols::initialize(CHECK);
336
337 SystemDictionary::initialize(CHECK);
338
339 // Create string constants
340 oop s = StringTable::intern("null", CHECK);
341 _the_null_string = OopHandle(vm_global(), s);
342 s = StringTable::intern("-2147483648", CHECK);
343 _the_min_jint_string = OopHandle(vm_global(), s);
344
345
346 #if INCLUDE_CDS
347 if (UseSharedSpaces) {
348 // Verify shared interfaces array.
349 assert(_the_array_interfaces_array->at(0) ==
350 SystemDictionary::Cloneable_klass(), "u3");
351 assert(_the_array_interfaces_array->at(1) ==
352 SystemDictionary::Serializable_klass(), "u3");
353 } else
354 #endif
355 {
356 // Set up shared interfaces array. (Do this before supers are set up.)
357 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
358 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
359 }
360
361 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
362 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
363 initialize_basic_type_klass(floatArrayKlassObj(), CHECK);
364 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
365 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
366 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
367 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
368 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
369 } // end of core bootstrapping
370
371 {
372 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
373 _the_null_sentinel = OopHandle(vm_global(), tns());
374 }
375
376 // Create a handle for reference_pending_list
377 _reference_pending_list = OopHandle(vm_global(), NULL);
378
379 // Maybe this could be lifted up now that object array can be initialized
380 // during the bootstrapping.
381
382 // OLD
383 // Initialize _objectArrayKlass after core bootstraping to make
384 // sure the super class is set up properly for _objectArrayKlass.
385 // ---
386 // NEW
387 // Since some of the old system object arrays have been converted to
388 // ordinary object arrays, _objectArrayKlass will be loaded when
389 // SystemDictionary::initialize(CHECK); is run. See the extra check
390 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
391 _objectArrayKlassObj = InstanceKlass::
392 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
393 // OLD
394 // Add the class to the class hierarchy manually to make sure that
395 // its vtable is initialized after core bootstrapping is completed.
396 // ---
397 // New
398 // Have already been initialized.
399 _objectArrayKlassObj->append_to_sibling_list();
400
401 #ifdef ASSERT
402 if (FullGCALot) {
403 // Allocate an array of dummy objects.
404 // We'd like these to be at the bottom of the old generation,
405 // so that when we free one and then collect,
406 // (almost) the whole heap moves
407 // and we find out if we actually update all the oops correctly.
408 // But we can't allocate directly in the old generation,
409 // so we allocate wherever, and hope that the first collection
410 // moves these objects to the bottom of the old generation.
411 int size = FullGCALotDummies * 2;
412
413 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
414 objArrayHandle dummy_array(THREAD, naked_array);
415 int i = 0;
416 while (i < size) {
417 // Allocate dummy in old generation
418 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK);
419 dummy_array->obj_at_put(i++, dummy);
420 }
421 {
422 // Only modify the global variable inside the mutex.
423 // If we had a race to here, the other dummy_array instances
424 // and their elements just get dropped on the floor, which is fine.
425 MutexLocker ml(THREAD, FullGCALot_lock);
426 if (_fullgc_alot_dummy_array.is_empty()) {
427 _fullgc_alot_dummy_array = OopHandle(vm_global(), dummy_array());
428 }
429 }
430 assert(i == ((objArrayOop)_fullgc_alot_dummy_array.resolve())->length(), "just checking");
431 }
432 #endif
433 }
434
435 void Universe::initialize_basic_type_mirrors(TRAPS) {
436 #if INCLUDE_CDS_JAVA_HEAP
437 if (UseSharedSpaces &&
438 HeapShared::open_archive_heap_region_mapped() &&
439 _mirrors[T_INT].resolve() != NULL) {
440 assert(HeapShared::is_heap_object_archiving_allowed(), "Sanity");
441
442 // check that all mirrors are mapped also
443 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
444 if (!is_reference_type((BasicType)i)) {
445 oop m = _mirrors[i].resolve();
446 assert(m != NULL, "archived mirrors should not be NULL");
447 }
448 }
449 } else
450 // _mirror[T_INT} could be NULL if archived heap is not mapped.
451 #endif
452 {
453 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
454 BasicType bt = (BasicType)i;
455 if (!is_reference_type(bt)) {
456 oop m = java_lang_Class::create_basic_type_mirror(type2name(bt), bt, CHECK);
457 _mirrors[i] = OopHandle(vm_global(), m);
458 }
459 }
460 }
461 }
462
463 void Universe::fixup_mirrors(TRAPS) {
464 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
465 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
466 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
467 // that the number of objects allocated at this point is very small.
468 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
469 HandleMark hm(THREAD);
470
471 if (!UseSharedSpaces) {
472 // Cache the start of the static fields
473 InstanceMirrorKlass::init_offset_of_static_fields();
474 }
475
476 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
477 int list_length = list->length();
478 for (int i = 0; i < list_length; i++) {
479 Klass* k = list->at(i);
480 assert(k->is_klass(), "List should only hold classes");
481 EXCEPTION_MARK;
482 java_lang_Class::fixup_mirror(k, CATCH);
483 }
484 delete java_lang_Class::fixup_mirror_list();
485 java_lang_Class::set_fixup_mirror_list(NULL);
486 }
487
488 #define assert_pll_locked(test) \
489 assert(Heap_lock->test(), "Reference pending list access requires lock")
490
491 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
492
493 oop Universe::reference_pending_list() {
494 if (Thread::current()->is_VM_thread()) {
495 assert_pll_locked(is_locked);
496 } else {
497 assert_pll_ownership();
498 }
499 return _reference_pending_list.resolve();
500 }
501
502 void Universe::clear_reference_pending_list() {
503 assert_pll_ownership();
504 _reference_pending_list.replace(NULL);
505 }
506
507 bool Universe::has_reference_pending_list() {
508 assert_pll_ownership();
509 return _reference_pending_list.peek() != NULL;
510 }
511
512 oop Universe::swap_reference_pending_list(oop list) {
513 assert_pll_locked(is_locked);
514 return _reference_pending_list.xchg(list);
515 }
516
517 #undef assert_pll_locked
518 #undef assert_pll_ownership
519
520 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) {
521 // init vtable of k and all subclasses
522 ko->vtable().initialize_vtable(false, CHECK);
523 if (ko->is_instance_klass()) {
524 for (Klass* sk = ko->subklass();
525 sk != NULL;
526 sk = sk->next_sibling()) {
527 reinitialize_vtable_of(sk, CHECK);
528 }
529 }
530 }
531
532 void Universe::reinitialize_vtables(TRAPS) {
533 // The vtables are initialized by starting at java.lang.Object and
534 // initializing through the subclass links, so that the super
535 // classes are always initialized first.
536 Klass* ok = SystemDictionary::Object_klass();
537 Universe::reinitialize_vtable_of(ok, THREAD);
538 }
539
540
541 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) {
542 k->itable().initialize_itable(false, CHECK);
543 }
544
545
546 void Universe::reinitialize_itables(TRAPS) {
547 MutexLocker mcld(THREAD, ClassLoaderDataGraph_lock);
548 ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK);
549 }
550
551
552 bool Universe::on_page_boundary(void* addr) {
553 return is_aligned(addr, os::vm_page_size());
554 }
555
556 // the array of preallocated errors with backtraces
557 objArrayOop Universe::preallocated_out_of_memory_errors() {
558 return (objArrayOop)_preallocated_out_of_memory_error_array.resolve();
559 }
560
561 objArrayOop Universe::out_of_memory_errors() { return (objArrayOop)_out_of_memory_errors.resolve(); }
562
563 oop Universe::out_of_memory_error_java_heap() {
564 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_java_heap));
565 }
566
567 oop Universe::out_of_memory_error_c_heap() {
568 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_c_heap));
569 }
570
571 oop Universe::out_of_memory_error_metaspace() {
572 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_metaspace));
573 }
574
575 oop Universe::out_of_memory_error_class_metaspace() {
576 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_class_metaspace));
577 }
578
579 oop Universe::out_of_memory_error_array_size() {
580 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_array_size));
581 }
582
583 oop Universe::out_of_memory_error_gc_overhead_limit() {
584 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_gc_overhead_limit));
585 }
586
587 oop Universe::out_of_memory_error_realloc_objects() {
588 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_realloc_objects));
589 }
590
591 // Throw default _out_of_memory_error_retry object as it will never propagate out of the VM
592 oop Universe::out_of_memory_error_retry() { return out_of_memory_errors()->obj_at(_oom_retry); }
593 oop Universe::delayed_stack_overflow_error_message() { return _delayed_stack_overflow_error_message.resolve(); }
594
595
596 bool Universe::should_fill_in_stack_trace(Handle throwable) {
597 // never attempt to fill in the stack trace of preallocated errors that do not have
598 // backtrace. These errors are kept alive forever and may be "re-used" when all
599 // preallocated errors with backtrace have been consumed. Also need to avoid
600 // a potential loop which could happen if an out of memory occurs when attempting
601 // to allocate the backtrace.
602 objArrayOop preallocated_oom = out_of_memory_errors();
603 for (int i = 0; i < _oom_count; i++) {
604 if (throwable() == preallocated_oom->obj_at(i)) {
605 return false;
606 }
607 }
608 return true;
609 }
610
611
612 oop Universe::gen_out_of_memory_error(oop default_err) {
613 // generate an out of memory error:
614 // - if there is a preallocated error and stack traces are available
615 // (j.l.Throwable is initialized), then return the preallocated
616 // error with a filled in stack trace, and with the message
617 // provided by the default error.
618 // - otherwise, return the default error, without a stack trace.
619 int next;
620 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
621 SystemDictionary::Throwable_klass()->is_initialized()) {
622 next = (int)Atomic::add(&_preallocated_out_of_memory_error_avail_count, -1);
623 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
624 } else {
625 next = -1;
626 }
627 if (next < 0) {
628 // all preallocated errors have been used.
629 // return default
630 return default_err;
631 } else {
632 Thread* THREAD = Thread::current();
633 Handle default_err_h(THREAD, default_err);
634 // get the error object at the slot and set set it to NULL so that the
635 // array isn't keeping it alive anymore.
636 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next));
637 assert(exc() != NULL, "slot has been used already");
638 preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
639
640 // use the message from the default error
641 oop msg = java_lang_Throwable::message(default_err_h());
642 assert(msg != NULL, "no message");
643 java_lang_Throwable::set_message(exc(), msg);
644
645 // populate the stack trace and return it.
646 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
647 return exc();
648 }
649 }
650
651 // Setup preallocated OutOfMemoryError errors
652 void Universe::create_preallocated_out_of_memory_errors(TRAPS) {
653 InstanceKlass* ik = SystemDictionary::OutOfMemoryError_klass();
654 objArrayOop oa = oopFactory::new_objArray(ik, _oom_count, CHECK);
655 objArrayHandle oom_array(THREAD, oa);
656
657 for (int i = 0; i < _oom_count; i++) {
658 oop oom_obj = ik->allocate_instance(CHECK);
659 oom_array->obj_at_put(i, oom_obj);
660 }
661 _out_of_memory_errors = OopHandle(vm_global(), oom_array());
662
663 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK);
664 java_lang_Throwable::set_message(oom_array->obj_at(_oom_java_heap), msg());
665
666 msg = java_lang_String::create_from_str("C heap space", CHECK);
667 java_lang_Throwable::set_message(oom_array->obj_at(_oom_c_heap), msg());
668
669 msg = java_lang_String::create_from_str("Metaspace", CHECK);
670 java_lang_Throwable::set_message(oom_array->obj_at(_oom_metaspace), msg());
671
672 msg = java_lang_String::create_from_str("Compressed class space", CHECK);
673 java_lang_Throwable::set_message(oom_array->obj_at(_oom_class_metaspace), msg());
674
675 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK);
676 java_lang_Throwable::set_message(oom_array->obj_at(_oom_array_size), msg());
677
678 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK);
679 java_lang_Throwable::set_message(oom_array->obj_at(_oom_gc_overhead_limit), msg());
680
681 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK);
682 java_lang_Throwable::set_message(oom_array->obj_at(_oom_realloc_objects), msg());
683
684 msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK);
685 java_lang_Throwable::set_message(oom_array->obj_at(_oom_retry), msg());
686
687 // Setup the array of errors that have preallocated backtrace
688 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
689 objArrayOop instance = oopFactory::new_objArray(ik, len, CHECK);
690 _preallocated_out_of_memory_error_array = OopHandle(vm_global(), instance);
691 objArrayHandle preallocated_oom_array(THREAD, instance);
692
693 for (int i=0; i<len; i++) {
694 oop err = ik->allocate_instance(CHECK);
695 Handle err_h(THREAD, err);
696 java_lang_Throwable::allocate_backtrace(err_h, CHECK);
697 preallocated_oom_array->obj_at_put(i, err_h());
698 }
699 _preallocated_out_of_memory_error_avail_count = (jint)len;
700 }
701
702 intptr_t Universe::_non_oop_bits = 0;
703
704 void* Universe::non_oop_word() {
705 // Neither the high bits nor the low bits of this value is allowed
706 // to look like (respectively) the high or low bits of a real oop.
707 //
708 // High and low are CPU-specific notions, but low always includes
709 // the low-order bit. Since oops are always aligned at least mod 4,
710 // setting the low-order bit will ensure that the low half of the
711 // word will never look like that of a real oop.
712 //
713 // Using the OS-supplied non-memory-address word (usually 0 or -1)
714 // will take care of the high bits, however many there are.
715
716 if (_non_oop_bits == 0) {
717 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
718 }
719
720 return (void*)_non_oop_bits;
721 }
722
723 static void initialize_global_behaviours() {
724 CompiledICProtectionBehaviour::set_current(new DefaultICProtectionBehaviour());
725 }
726
727 jint universe_init() {
728 assert(!Universe::_fully_initialized, "called after initialize_vtables");
729 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
730 "LogHeapWordSize is incorrect.");
731 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
732 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
733 "oop size is not not a multiple of HeapWord size");
734
735 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
736
737 initialize_global_behaviours();
738
739 GCLogPrecious::initialize();
740
741 GCConfig::arguments()->initialize_heap_sizes();
742
743 jint status = Universe::initialize_heap();
744 if (status != JNI_OK) {
745 return status;
746 }
747
748 Universe::initialize_tlab();
749
750 Metaspace::global_initialize();
751
752 // Initialize performance counters for metaspaces
753 MetaspaceCounters::initialize_performance_counters();
754 CompressedClassSpaceCounters::initialize_performance_counters();
755
756 AOTLoader::universe_init();
757
758 // Checks 'AfterMemoryInit' constraints.
759 if (!JVMFlagConstraintList::check_constraints(JVMFlagConstraint::AfterMemoryInit)) {
760 return JNI_EINVAL;
761 }
762
763 // Create memory for metadata. Must be after initializing heap for
764 // DumpSharedSpaces.
765 ClassLoaderData::init_null_class_loader_data();
766
767 // We have a heap so create the Method* caches before
768 // Metaspace::initialize_shared_spaces() tries to populate them.
769 Universe::_finalizer_register_cache = new LatestMethodCache();
770 Universe::_loader_addClass_cache = new LatestMethodCache();
771 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
772 Universe::_throw_no_such_method_error_cache = new LatestMethodCache();
773 Universe::_do_stack_walk_cache = new LatestMethodCache();
774
775 #if INCLUDE_CDS
776 if (UseSharedSpaces) {
777 // Read the data structures supporting the shared spaces (shared
778 // system dictionary, symbol table, etc.). After that, access to
779 // the file (other than the mapped regions) is no longer needed, and
780 // the file is closed. Closing the file does not affect the
781 // currently mapped regions.
782 MetaspaceShared::initialize_shared_spaces();
783 StringTable::create_table();
784 } else
785 #endif
786 {
787 SymbolTable::create_table();
788 StringTable::create_table();
789 }
790
791 #if INCLUDE_CDS
792 if (Arguments::is_dumping_archive()) {
793 MetaspaceShared::prepare_for_dumping();
794 }
795 #endif
796
797 if (strlen(VerifySubSet) > 0) {
798 Universe::initialize_verify_flags();
799 }
800
801 ResolvedMethodTable::create_table();
802
803 return JNI_OK;
804 }
805
806 jint Universe::initialize_heap() {
807 assert(_collectedHeap == NULL, "Heap already created");
808 _collectedHeap = GCConfig::arguments()->create_heap();
809
810 log_info(gc)("Using %s", _collectedHeap->name());
811 return _collectedHeap->initialize();
812 }
813
814 void Universe::initialize_tlab() {
815 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
816 if (UseTLAB) {
817 assert(Universe::heap()->supports_tlab_allocation(),
818 "Should support thread-local allocation buffers");
819 ThreadLocalAllocBuffer::startup_initialization();
820 }
821 }
822
823 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
824
825 assert(alignment <= Arguments::conservative_max_heap_alignment(),
826 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
827 alignment, Arguments::conservative_max_heap_alignment());
828
829 size_t total_reserved = align_up(heap_size, alignment);
830 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
831 "heap size is too big for compressed oops");
832
833 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size());
834 assert(!UseLargePages
835 || UseParallelGC
836 || use_large_pages, "Wrong alignment to use large pages");
837
838 // Now create the space.
839 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt);
840
841 if (total_rs.is_reserved()) {
842 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
843 "must be exactly of required size and alignment");
844 // We are good.
845
846 if (AllocateHeapAt != NULL) {
847 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
848 }
849
850 if (UseCompressedOops) {
851 CompressedOops::initialize(total_rs);
852 }
853
854 Universe::calculate_verify_data((HeapWord*)total_rs.base(), (HeapWord*)total_rs.end());
855
856 return total_rs;
857 }
858
859 vm_exit_during_initialization(
860 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
861 total_reserved/K));
862
863 // satisfy compiler
864 ShouldNotReachHere();
865 return ReservedHeapSpace(0, 0, false);
866 }
867
868
869 // It's the caller's responsibility to ensure glitch-freedom
870 // (if required).
871 void Universe::update_heap_info_at_gc() {
872 _heap_capacity_at_last_gc = heap()->capacity();
873 _heap_used_at_last_gc = heap()->used();
874 }
875
876 OopStorage* Universe::vm_weak() {
877 return Universe::_vm_weak;
878 }
879
880 OopStorage* Universe::vm_global() {
881 return Universe::_vm_global;
882 }
883
884 void Universe::oopstorage_init() {
885 Universe::_vm_global = OopStorageSet::create_strong("VM Global");
886 Universe::_vm_weak = OopStorageSet::create_weak("VM Weak");
887 }
888
889 void universe_oopstorage_init() {
890 Universe::oopstorage_init();
891 }
892
893 void initialize_known_method(LatestMethodCache* method_cache,
894 InstanceKlass* ik,
895 const char* method,
896 Symbol* signature,
897 bool is_static, TRAPS)
898 {
899 TempNewSymbol name = SymbolTable::new_symbol(method);
900 Method* m = NULL;
901 // The klass must be linked before looking up the method.
902 if (!ik->link_class_or_fail(THREAD) ||
903 ((m = ik->find_method(name, signature)) == NULL) ||
904 is_static != m->is_static()) {
905 ResourceMark rm(THREAD);
906 // NoSuchMethodException doesn't actually work because it tries to run the
907 // <init> function before java_lang_Class is linked. Print error and exit.
908 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
909 ik->name()->as_C_string(), method));
910 }
911 method_cache->init(ik, m);
912 }
913
914 void Universe::initialize_known_methods(TRAPS) {
915 // Set up static method for registering finalizers
916 initialize_known_method(_finalizer_register_cache,
917 SystemDictionary::Finalizer_klass(),
918 "register",
919 vmSymbols::object_void_signature(), true, CHECK);
920
921 initialize_known_method(_throw_illegal_access_error_cache,
922 SystemDictionary::internal_Unsafe_klass(),
923 "throwIllegalAccessError",
924 vmSymbols::void_method_signature(), true, CHECK);
925
926 initialize_known_method(_throw_no_such_method_error_cache,
927 SystemDictionary::internal_Unsafe_klass(),
928 "throwNoSuchMethodError",
929 vmSymbols::void_method_signature(), true, CHECK);
930
931 // Set up method for registering loaded classes in class loader vector
932 initialize_known_method(_loader_addClass_cache,
933 SystemDictionary::ClassLoader_klass(),
934 "addClass",
935 vmSymbols::class_void_signature(), false, CHECK);
936
937 // Set up method for stack walking
938 initialize_known_method(_do_stack_walk_cache,
939 SystemDictionary::AbstractStackWalker_klass(),
940 "doStackWalk",
941 vmSymbols::doStackWalk_signature(), false, CHECK);
942 }
943
944 void universe2_init() {
945 EXCEPTION_MARK;
946 Universe::genesis(CATCH);
947 }
948
949 // Set after initialization of the module runtime, call_initModuleRuntime
950 void universe_post_module_init() {
951 Universe::_module_initialized = true;
952 }
953
954 bool universe_post_init() {
955 assert(!is_init_completed(), "Error: initialization not yet completed!");
956 Universe::_fully_initialized = true;
957 EXCEPTION_MARK;
958 if (!UseSharedSpaces) {
959 ResourceMark rm;
960 Universe::reinitialize_vtables(CHECK_false);
961 Universe::reinitialize_itables(CHECK_false);
962 }
963
964 HandleMark hm(THREAD);
965 // Setup preallocated empty java.lang.Class array for Method reflection.
966
967 objArrayOop the_empty_class_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
968 Universe::_the_empty_class_array = OopHandle(Universe::vm_global(), the_empty_class_array);
969
970 // Setup preallocated OutOfMemoryError errors
971 Universe::create_preallocated_out_of_memory_errors(CHECK_false);
972
973 oop instance;
974 // Setup preallocated cause message for delayed StackOverflowError
975 if (StackReservedPages > 0) {
976 instance = java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
977 Universe::_delayed_stack_overflow_error_message = OopHandle(Universe::vm_global(), instance);
978 }
979
980 // Setup preallocated NullPointerException
981 // (this is currently used for a cheap & dirty solution in compiler exception handling)
982 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
983 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
984 Universe::_null_ptr_exception_instance = OopHandle(Universe::vm_global(), instance);
985
986 // Setup preallocated ArithmeticException
987 // (this is currently used for a cheap & dirty solution in compiler exception handling)
988 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
989 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
990 Universe::_arithmetic_exception_instance = OopHandle(Universe::vm_global(), instance);
991
992 // Virtual Machine Error for when we get into a situation we can't resolve
993 k = SystemDictionary::VirtualMachineError_klass();
994 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
995 if (!linked) {
996 tty->print_cr("Unable to link/verify VirtualMachineError class");
997 return false; // initialization failed
998 }
999 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1000 Universe::_virtual_machine_error_instance = OopHandle(Universe::vm_global(), instance);
1001
1002 Handle msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1003 java_lang_Throwable::set_message(Universe::arithmetic_exception_instance(), msg());
1004
1005 Universe::initialize_known_methods(CHECK_false);
1006
1007 // This needs to be done before the first scavenge/gc, since
1008 // it's an input to soft ref clearing policy.
1009 {
1010 MutexLocker x(THREAD, Heap_lock);
1011 Universe::update_heap_info_at_gc();
1012 }
1013
1014 // ("weak") refs processing infrastructure initialization
1015 Universe::heap()->post_initialize();
1016
1017 MemoryService::add_metaspace_memory_pools();
1018
1019 MemoryService::set_universe_heap(Universe::heap());
1020 #if INCLUDE_CDS
1021 MetaspaceShared::post_initialize(CHECK_false);
1022 #endif
1023 return true;
1024 }
1025
1026
1027 void Universe::compute_base_vtable_size() {
1028 _base_vtable_size = ClassLoader::compute_Object_vtable();
1029 }
1030
1031 void Universe::print_on(outputStream* st) {
1032 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1033 st->print_cr("Heap");
1034 heap()->print_on(st);
1035 }
1036
1037 void Universe::print_heap_at_SIGBREAK() {
1038 if (PrintHeapAtSIGBREAK) {
1039 print_on(tty);
1040 tty->cr();
1041 tty->flush();
1042 }
1043 }
1044
1045 void Universe::print_heap_before_gc() {
1046 LogTarget(Debug, gc, heap) lt;
1047 if (lt.is_enabled()) {
1048 LogStream ls(lt);
1049 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1050 ResourceMark rm;
1051 heap()->print_on(&ls);
1052 }
1053 }
1054
1055 void Universe::print_heap_after_gc() {
1056 LogTarget(Debug, gc, heap) lt;
1057 if (lt.is_enabled()) {
1058 LogStream ls(lt);
1059 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1060 ResourceMark rm;
1061 heap()->print_on(&ls);
1062 }
1063 }
1064
1065 void Universe::initialize_verify_flags() {
1066 verify_flags = 0;
1067 const char delimiter[] = " ,";
1068
1069 size_t length = strlen(VerifySubSet);
1070 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1071 strncpy(subset_list, VerifySubSet, length + 1);
1072 char* save_ptr;
1073
1074 char* token = strtok_r(subset_list, delimiter, &save_ptr);
1075 while (token != NULL) {
1076 if (strcmp(token, "threads") == 0) {
1077 verify_flags |= Verify_Threads;
1078 } else if (strcmp(token, "heap") == 0) {
1079 verify_flags |= Verify_Heap;
1080 } else if (strcmp(token, "symbol_table") == 0) {
1081 verify_flags |= Verify_SymbolTable;
1082 } else if (strcmp(token, "string_table") == 0) {
1083 verify_flags |= Verify_StringTable;
1084 } else if (strcmp(token, "codecache") == 0) {
1085 verify_flags |= Verify_CodeCache;
1086 } else if (strcmp(token, "dictionary") == 0) {
1087 verify_flags |= Verify_SystemDictionary;
1088 } else if (strcmp(token, "classloader_data_graph") == 0) {
1089 verify_flags |= Verify_ClassLoaderDataGraph;
1090 } else if (strcmp(token, "metaspace") == 0) {
1091 verify_flags |= Verify_MetaspaceUtils;
1092 } else if (strcmp(token, "jni_handles") == 0) {
1093 verify_flags |= Verify_JNIHandles;
1094 } else if (strcmp(token, "codecache_oops") == 0) {
1095 verify_flags |= Verify_CodeCacheOops;
1096 } else if (strcmp(token, "resolved_method_table") == 0) {
1097 verify_flags |= Verify_ResolvedMethodTable;
1098 } else {
1099 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1100 }
1101 token = strtok_r(NULL, delimiter, &save_ptr);
1102 }
1103 FREE_C_HEAP_ARRAY(char, subset_list);
1104 }
1105
1106 bool Universe::should_verify_subset(uint subset) {
1107 if (verify_flags & subset) {
1108 return true;
1109 }
1110 return false;
1111 }
1112
1113 void Universe::verify(VerifyOption option, const char* prefix) {
1114 // The use of _verify_in_progress is a temporary work around for
1115 // 6320749. Don't bother with a creating a class to set and clear
1116 // it since it is only used in this method and the control flow is
1117 // straight forward.
1118 _verify_in_progress = true;
1119
1120 COMPILER2_PRESENT(
1121 assert(!DerivedPointerTable::is_active(),
1122 "DPT should not be active during verification "
1123 "(of thread stacks below)");
1124 )
1125
1126 Thread* thread = Thread::current();
1127 ResourceMark rm(thread);
1128 HandleMark hm(thread); // Handles created during verification can be zapped
1129 _verify_count++;
1130
1131 FormatBuffer<> title("Verifying %s", prefix);
1132 GCTraceTime(Info, gc, verify) tm(title.buffer());
1133 if (should_verify_subset(Verify_Threads)) {
1134 log_debug(gc, verify)("Threads");
1135 Threads::verify();
1136 }
1137 if (should_verify_subset(Verify_Heap)) {
1138 log_debug(gc, verify)("Heap");
1139 heap()->verify(option);
1140 }
1141 if (should_verify_subset(Verify_SymbolTable)) {
1142 log_debug(gc, verify)("SymbolTable");
1143 SymbolTable::verify();
1144 }
1145 if (should_verify_subset(Verify_StringTable)) {
1146 log_debug(gc, verify)("StringTable");
1147 StringTable::verify();
1148 }
1149 if (should_verify_subset(Verify_CodeCache)) {
1150 {
1151 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1152 log_debug(gc, verify)("CodeCache");
1153 CodeCache::verify();
1154 }
1155 }
1156 if (should_verify_subset(Verify_SystemDictionary)) {
1157 log_debug(gc, verify)("SystemDictionary");
1158 SystemDictionary::verify();
1159 }
1160 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1161 log_debug(gc, verify)("ClassLoaderDataGraph");
1162 ClassLoaderDataGraph::verify();
1163 }
1164 if (should_verify_subset(Verify_MetaspaceUtils)) {
1165 log_debug(gc, verify)("MetaspaceUtils");
1166 MetaspaceUtils::verify_free_chunks();
1167 }
1168 if (should_verify_subset(Verify_JNIHandles)) {
1169 log_debug(gc, verify)("JNIHandles");
1170 JNIHandles::verify();
1171 }
1172 if (should_verify_subset(Verify_CodeCacheOops)) {
1173 log_debug(gc, verify)("CodeCache Oops");
1174 CodeCache::verify_oops();
1175 }
1176 if (should_verify_subset(Verify_ResolvedMethodTable)) {
1177 log_debug(gc, verify)("ResolvedMethodTable Oops");
1178 ResolvedMethodTable::verify();
1179 }
1180
1181 _verify_in_progress = false;
1182 }
1183
1184
1185 #ifndef PRODUCT
1186 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1187 assert(low_boundary < high_boundary, "bad interval");
1188
1189 // decide which low-order bits we require to be clear:
1190 size_t alignSize = MinObjAlignmentInBytes;
1191 size_t min_object_size = CollectedHeap::min_fill_size();
1192
1193 // make an inclusive limit:
1194 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1195 uintptr_t min = (uintptr_t)low_boundary;
1196 assert(min < max, "bad interval");
1197 uintptr_t diff = max ^ min;
1198
1199 // throw away enough low-order bits to make the diff vanish
1200 uintptr_t mask = (uintptr_t)(-1);
1201 while ((mask & diff) != 0)
1202 mask <<= 1;
1203 uintptr_t bits = (min & mask);
1204 assert(bits == (max & mask), "correct mask");
1205 // check an intermediate value between min and max, just to make sure:
1206 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1207
1208 // require address alignment, too:
1209 mask |= (alignSize - 1);
1210
1211 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1212 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1213 }
1214 _verify_oop_mask = mask;
1215 _verify_oop_bits = bits;
1216 }
1217
1218 // Oop verification (see MacroAssembler::verify_oop)
1219
1220 uintptr_t Universe::verify_oop_mask() {
1221 return _verify_oop_mask;
1222 }
1223
1224 uintptr_t Universe::verify_oop_bits() {
1225 return _verify_oop_bits;
1226 }
1227
1228 uintptr_t Universe::verify_mark_mask() {
1229 return markWord::lock_mask_in_place;
1230 }
1231
1232 uintptr_t Universe::verify_mark_bits() {
1233 intptr_t mask = verify_mark_mask();
1234 intptr_t bits = (intptr_t)markWord::prototype().value();
1235 assert((bits & ~mask) == 0, "no stray header bits");
1236 return bits;
1237 }
1238 #endif // PRODUCT
1239
1240
1241 void LatestMethodCache::init(Klass* k, Method* m) {
1242 if (!UseSharedSpaces) {
1243 _klass = k;
1244 }
1245 #ifndef PRODUCT
1246 else {
1247 // sharing initilization should have already set up _klass
1248 assert(_klass != NULL, "just checking");
1249 }
1250 #endif
1251
1252 _method_idnum = m->method_idnum();
1253 assert(_method_idnum >= 0, "sanity check");
1254 }
1255
1256
1257 Method* LatestMethodCache::get_method() {
1258 if (klass() == NULL) return NULL;
1259 InstanceKlass* ik = InstanceKlass::cast(klass());
1260 Method* m = ik->method_with_idnum(method_idnum());
1261 assert(m != NULL, "sanity check");
1262 return m;
1263 }
1264
1265
1266 #ifdef ASSERT
1267 // Release dummy object(s) at bottom of heap
1268 bool Universe::release_fullgc_alot_dummy() {
1269 MutexLocker ml(FullGCALot_lock);
1270 objArrayOop fullgc_alot_dummy_array = (objArrayOop)_fullgc_alot_dummy_array.resolve();
1271 if (fullgc_alot_dummy_array != NULL) {
1272 if (_fullgc_alot_dummy_next >= fullgc_alot_dummy_array->length()) {
1273 // No more dummies to release, release entire array instead
1274 _fullgc_alot_dummy_array.release(Universe::vm_global());
1275 return false;
1276 }
1277
1278 // Release dummy at bottom of old generation
1279 fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1280 }
1281 return true;
1282 }
1283
1284 #endif // ASSERT
--- EOF ---