1 /*
2 * Copyright (c) 1997, 2022, 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 "cds/archiveHeapLoader.hpp"
27 #include "cds/dynamicArchive.hpp"
28 #include "cds/heapShared.hpp"
29 #include "cds/metaspaceShared.hpp"
30 #include "classfile/classLoader.hpp"
31 #include "classfile/classLoaderDataGraph.hpp"
32 #include "classfile/javaClasses.hpp"
33 #include "classfile/stringTable.hpp"
34 #include "classfile/symbolTable.hpp"
35 #include "classfile/systemDictionary.hpp"
36 #include "classfile/vmClasses.hpp"
37 #include "classfile/vmSymbols.hpp"
38 #include "code/codeBehaviours.hpp"
39 #include "code/codeCache.hpp"
40 #include "compiler/oopMap.hpp"
41 #include "gc/shared/collectedHeap.inline.hpp"
42 #include "gc/shared/gcArguments.hpp"
43 #include "gc/shared/gcConfig.hpp"
44 #include "gc/shared/gcLogPrecious.hpp"
45 #include "gc/shared/gcTraceTime.inline.hpp"
46 #include "gc/shared/oopStorageSet.hpp"
47 #include "gc/shared/plab.hpp"
48 #include "gc/shared/stringdedup/stringDedup.hpp"
49 #include "gc/shared/tlab_globals.hpp"
50 #include "logging/log.hpp"
51 #include "logging/logStream.hpp"
52 #include "memory/metadataFactory.hpp"
53 #include "memory/metaspaceClosure.hpp"
54 #include "memory/metaspaceCounters.hpp"
55 #include "memory/metaspaceUtils.hpp"
56 #include "memory/oopFactory.hpp"
57 #include "memory/resourceArea.hpp"
58 #include "memory/universe.hpp"
59 #include "oops/compressedOops.hpp"
60 #include "oops/instanceKlass.hpp"
61 #include "oops/instanceMirrorKlass.hpp"
62 #include "oops/klass.inline.hpp"
63 #include "oops/objArrayOop.inline.hpp"
64 #include "oops/oop.inline.hpp"
65 #include "oops/oopHandle.inline.hpp"
66 #include "oops/typeArrayKlass.hpp"
67 #include "prims/resolvedMethodTable.hpp"
68 #include "runtime/arguments.hpp"
69 #include "runtime/atomic.hpp"
70 #include "runtime/flags/jvmFlagLimit.hpp"
71 #include "runtime/handles.inline.hpp"
72 #include "runtime/init.hpp"
73 #include "runtime/java.hpp"
74 #include "runtime/javaThread.hpp"
75 #include "runtime/jniHandles.hpp"
76 #include "runtime/threads.hpp"
77 #include "runtime/timerTrace.hpp"
78 #include "services/memoryService.hpp"
79 #include "utilities/align.hpp"
80 #include "utilities/autoRestore.hpp"
81 #include "utilities/debug.hpp"
82 #include "utilities/formatBuffer.hpp"
83 #include "utilities/macros.hpp"
84 #include "utilities/ostream.hpp"
85 #include "utilities/preserveException.hpp"
86
87 // Known objects
88 Klass* Universe::_typeArrayKlassObjs[T_LONG+1] = { NULL /*, NULL...*/ };
89 Klass* Universe::_objectArrayKlassObj = NULL;
90 Klass* Universe::_fillerArrayKlassObj = NULL;
91 OopHandle Universe::_basic_type_mirrors[T_VOID+1];
92 #if INCLUDE_CDS_JAVA_HEAP
93 int Universe::_archived_basic_type_mirror_indices[T_VOID+1];
94 #endif
95
96 OopHandle Universe::_main_thread_group;
97 OopHandle Universe::_system_thread_group;
98 OopHandle Universe::_the_empty_class_array;
99 OopHandle Universe::_the_null_string;
100 OopHandle Universe::_the_min_jint_string;
101
102 OopHandle Universe::_the_null_sentinel;
103
104 // _out_of_memory_errors is an objArray
105 enum OutOfMemoryInstance { _oom_java_heap,
106 _oom_c_heap,
107 _oom_metaspace,
108 _oom_class_metaspace,
109 _oom_array_size,
110 _oom_gc_overhead_limit,
111 _oom_realloc_objects,
112 _oom_retry,
113 _oom_count };
114
115 OopHandle Universe::_out_of_memory_errors;
116 OopHandle Universe::_delayed_stack_overflow_error_message;
117 OopHandle Universe::_preallocated_out_of_memory_error_array;
118 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
119
120 // Message details for OOME objects, preallocate these objects since they could be
121 // used when throwing OOME, we should try to avoid further allocation in such case
122 OopHandle Universe::_msg_metaspace;
123 OopHandle Universe::_msg_class_metaspace;
124
125 OopHandle Universe::_null_ptr_exception_instance;
126 OopHandle Universe::_arithmetic_exception_instance;
127 OopHandle Universe::_virtual_machine_error_instance;
128
129 OopHandle Universe::_reference_pending_list;
130
131 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
132 LatestMethodCache* Universe::_finalizer_register_cache = NULL;
133 LatestMethodCache* Universe::_loader_addClass_cache = NULL;
134 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL;
135 LatestMethodCache* Universe::_throw_no_such_method_error_cache = NULL;
136 LatestMethodCache* Universe::_do_stack_walk_cache = NULL;
137
138 long Universe::verify_flags = Universe::Verify_All;
139
140 Array<int>* Universe::_the_empty_int_array = NULL;
141 Array<u2>* Universe::_the_empty_short_array = NULL;
142 Array<Klass*>* Universe::_the_empty_klass_array = NULL;
143 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = NULL;
144 Array<Method*>* Universe::_the_empty_method_array = NULL;
145
146 // These variables are guarded by FullGCALot_lock.
147 debug_only(OopHandle Universe::_fullgc_alot_dummy_array;)
148 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
149
150 // Heap
151 int Universe::_verify_count = 0;
152
153 // Oop verification (see MacroAssembler::verify_oop)
154 uintptr_t Universe::_verify_oop_mask = 0;
155 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
156
157 int Universe::_base_vtable_size = 0;
158 bool Universe::_bootstrapping = false;
159 bool Universe::_module_initialized = false;
160 bool Universe::_fully_initialized = false;
161
162 OopStorage* Universe::_vm_weak = NULL;
163 OopStorage* Universe::_vm_global = NULL;
164
165 CollectedHeap* Universe::_collectedHeap = NULL;
166
167 objArrayOop Universe::the_empty_class_array () {
168 return (objArrayOop)_the_empty_class_array.resolve();
169 }
170
171 oop Universe::main_thread_group() { return _main_thread_group.resolve(); }
172 void Universe::set_main_thread_group(oop group) { _main_thread_group = OopHandle(vm_global(), group); }
173
174 oop Universe::system_thread_group() { return _system_thread_group.resolve(); }
175 void Universe::set_system_thread_group(oop group) { _system_thread_group = OopHandle(vm_global(), group); }
176
177 oop Universe::the_null_string() { return _the_null_string.resolve(); }
178 oop Universe::the_min_jint_string() { return _the_min_jint_string.resolve(); }
179
180 oop Universe::null_ptr_exception_instance() { return _null_ptr_exception_instance.resolve(); }
181 oop Universe::arithmetic_exception_instance() { return _arithmetic_exception_instance.resolve(); }
182 oop Universe::virtual_machine_error_instance() { return _virtual_machine_error_instance.resolve(); }
183
184 oop Universe::the_null_sentinel() { return _the_null_sentinel.resolve(); }
185
186 oop Universe::int_mirror() { return check_mirror(_basic_type_mirrors[T_INT].resolve()); }
187 oop Universe::float_mirror() { return check_mirror(_basic_type_mirrors[T_FLOAT].resolve()); }
188 oop Universe::double_mirror() { return check_mirror(_basic_type_mirrors[T_DOUBLE].resolve()); }
189 oop Universe::byte_mirror() { return check_mirror(_basic_type_mirrors[T_BYTE].resolve()); }
190 oop Universe::bool_mirror() { return check_mirror(_basic_type_mirrors[T_BOOLEAN].resolve()); }
191 oop Universe::char_mirror() { return check_mirror(_basic_type_mirrors[T_CHAR].resolve()); }
192 oop Universe::long_mirror() { return check_mirror(_basic_type_mirrors[T_LONG].resolve()); }
193 oop Universe::short_mirror() { return check_mirror(_basic_type_mirrors[T_SHORT].resolve()); }
194 oop Universe::void_mirror() { return check_mirror(_basic_type_mirrors[T_VOID].resolve()); }
195
196 oop Universe::java_mirror(BasicType t) {
197 assert((uint)t < T_VOID+1, "range check");
198 assert(!is_reference_type(t), "sanity");
199 return check_mirror(_basic_type_mirrors[t].resolve());
200 }
201
202 void Universe::basic_type_classes_do(KlassClosure *closure) {
203 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
204 closure->do_klass(_typeArrayKlassObjs[i]);
205 }
206 // We don't do the following because it will confuse JVMTI.
207 // _fillerArrayKlassObj is used only by GC, which doesn't need to see
208 // this klass from basic_type_classes_do().
209 //
210 // closure->do_klass(_fillerArrayKlassObj);
211 }
212
213 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
214 it->push(&_klass);
215 }
216
217 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
218 it->push(&_fillerArrayKlassObj);
219 for (int i = 0; i < T_LONG+1; i++) {
220 it->push(&_typeArrayKlassObjs[i]);
221 }
222 it->push(&_objectArrayKlassObj);
223
224 it->push(&_the_empty_int_array);
225 it->push(&_the_empty_short_array);
226 it->push(&_the_empty_klass_array);
227 it->push(&_the_empty_instance_klass_array);
228 it->push(&_the_empty_method_array);
229 it->push(&_the_array_interfaces_array);
230
231 _finalizer_register_cache->metaspace_pointers_do(it);
232 _loader_addClass_cache->metaspace_pointers_do(it);
233 _throw_illegal_access_error_cache->metaspace_pointers_do(it);
234 _throw_no_such_method_error_cache->metaspace_pointers_do(it);
235 _do_stack_walk_cache->metaspace_pointers_do(it);
236 }
237
238 #if INCLUDE_CDS_JAVA_HEAP
239 void Universe::set_archived_basic_type_mirror_index(BasicType t, int index) {
240 assert(DumpSharedSpaces, "dump-time only");
241 assert(!is_reference_type(t), "sanity");
242 _archived_basic_type_mirror_indices[t] = index;
243 }
244
245 void Universe::update_archived_basic_type_mirrors() {
246 if (ArchiveHeapLoader::are_archived_mirrors_available()) {
247 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
248 int index = _archived_basic_type_mirror_indices[i];
249 if (!is_reference_type((BasicType)i) && index >= 0) {
250 oop mirror_oop = HeapShared::get_root(index);
251 assert(mirror_oop != NULL, "must be");
252 _basic_type_mirrors[i] = OopHandle(vm_global(), mirror_oop);
253 }
254 }
255 }
256 }
257 #endif
258
259 void Universe::serialize(SerializeClosure* f) {
260
261 #if INCLUDE_CDS_JAVA_HEAP
262 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
263 f->do_u4((u4*)&_archived_basic_type_mirror_indices[i]);
264 // if f->reading(): We can't call HeapShared::get_root() yet, as the heap
265 // contents may need to be relocated. _basic_type_mirrors[i] will be
266 // updated later in Universe::update_archived_basic_type_mirrors().
267 }
268 #endif
269
270 f->do_ptr((void**)&_fillerArrayKlassObj);
271 for (int i = 0; i < T_LONG+1; i++) {
272 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
273 }
274
275 f->do_ptr((void**)&_objectArrayKlassObj);
276 f->do_ptr((void**)&_the_array_interfaces_array);
277 f->do_ptr((void**)&_the_empty_int_array);
278 f->do_ptr((void**)&_the_empty_short_array);
279 f->do_ptr((void**)&_the_empty_method_array);
280 f->do_ptr((void**)&_the_empty_klass_array);
281 f->do_ptr((void**)&_the_empty_instance_klass_array);
282 _finalizer_register_cache->serialize(f);
283 _loader_addClass_cache->serialize(f);
284 _throw_illegal_access_error_cache->serialize(f);
285 _throw_no_such_method_error_cache->serialize(f);
286 _do_stack_walk_cache->serialize(f);
287 }
288
289
290 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
291 if (size < alignment || size % alignment != 0) {
292 vm_exit_during_initialization(
293 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
294 }
295 }
296
297 void initialize_basic_type_klass(Klass* k, TRAPS) {
298 Klass* ok = vmClasses::Object_klass();
299 #if INCLUDE_CDS
300 if (UseSharedSpaces) {
301 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
302 assert(k->super() == ok, "u3");
303 if (k->is_instance_klass()) {
304 InstanceKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), NULL, CHECK);
305 } else {
306 ArrayKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), CHECK);
307 }
308 } else
309 #endif
310 {
311 k->initialize_supers(ok, NULL, CHECK);
312 }
313 k->append_to_sibling_list();
314 }
315
316 void Universe::genesis(TRAPS) {
317 ResourceMark rm(THREAD);
318 HandleMark hm(THREAD);
319
320 { AutoModifyRestore<bool> temporarily(_bootstrapping, true);
321
322 { MutexLocker mc(THREAD, Compile_lock);
323
324 java_lang_Class::allocate_fixup_lists();
325
326 // determine base vtable size; without that we cannot create the array klasses
327 compute_base_vtable_size();
328
329 if (!UseSharedSpaces) {
330 // Initialization of the fillerArrayKlass must come before regular
331 // int-TypeArrayKlass so that the int-Array mirror points to the
332 // int-TypeArrayKlass.
333 _fillerArrayKlassObj = TypeArrayKlass::create_klass(T_INT, "Ljdk/internal/vm/FillerArray;", CHECK);
334 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
335 _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK);
336 }
337
338 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
339
340 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
341 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
342 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
343 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
344 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
345 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK);
346 }
347 }
348
349 vmSymbols::initialize();
350
351 SystemDictionary::initialize(CHECK);
352
353 // Create string constants
354 oop s = StringTable::intern("null", CHECK);
355 _the_null_string = OopHandle(vm_global(), s);
356 s = StringTable::intern("-2147483648", CHECK);
357 _the_min_jint_string = OopHandle(vm_global(), s);
358
359
360 #if INCLUDE_CDS
361 if (UseSharedSpaces) {
362 // Verify shared interfaces array.
363 assert(_the_array_interfaces_array->at(0) ==
364 vmClasses::Cloneable_klass(), "u3");
365 assert(_the_array_interfaces_array->at(1) ==
366 vmClasses::Serializable_klass(), "u3");
367 } else
368 #endif
369 {
370 // Set up shared interfaces array. (Do this before supers are set up.)
371 _the_array_interfaces_array->at_put(0, vmClasses::Cloneable_klass());
372 _the_array_interfaces_array->at_put(1, vmClasses::Serializable_klass());
373 }
374
375 initialize_basic_type_klass(_fillerArrayKlassObj, CHECK);
376
377 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
378 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
379 initialize_basic_type_klass(floatArrayKlassObj(), CHECK);
380 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
381 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
382 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
383 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
384 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
385
386 assert(_fillerArrayKlassObj != intArrayKlassObj(),
387 "Internal filler array klass should be different to int array Klass");
388 } // end of core bootstrapping
389
390 {
391 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
392 _the_null_sentinel = OopHandle(vm_global(), tns());
393 }
394
395 // Create a handle for reference_pending_list
396 _reference_pending_list = OopHandle(vm_global(), NULL);
397
398 // Maybe this could be lifted up now that object array can be initialized
399 // during the bootstrapping.
400
401 // OLD
402 // Initialize _objectArrayKlass after core bootstraping to make
403 // sure the super class is set up properly for _objectArrayKlass.
404 // ---
405 // NEW
406 // Since some of the old system object arrays have been converted to
407 // ordinary object arrays, _objectArrayKlass will be loaded when
408 // SystemDictionary::initialize(CHECK); is run. See the extra check
409 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
410 _objectArrayKlassObj = InstanceKlass::
411 cast(vmClasses::Object_klass())->array_klass(1, CHECK);
412 // OLD
413 // Add the class to the class hierarchy manually to make sure that
414 // its vtable is initialized after core bootstrapping is completed.
415 // ---
416 // New
417 // Have already been initialized.
418 _objectArrayKlassObj->append_to_sibling_list();
419
420 #ifdef ASSERT
421 if (FullGCALot) {
422 // Allocate an array of dummy objects.
423 // We'd like these to be at the bottom of the old generation,
424 // so that when we free one and then collect,
425 // (almost) the whole heap moves
426 // and we find out if we actually update all the oops correctly.
427 // But we can't allocate directly in the old generation,
428 // so we allocate wherever, and hope that the first collection
429 // moves these objects to the bottom of the old generation.
430 int size = FullGCALotDummies * 2;
431
432 objArrayOop naked_array = oopFactory::new_objArray(vmClasses::Object_klass(), size, CHECK);
433 objArrayHandle dummy_array(THREAD, naked_array);
434 int i = 0;
435 while (i < size) {
436 // Allocate dummy in old generation
437 oop dummy = vmClasses::Object_klass()->allocate_instance(CHECK);
438 dummy_array->obj_at_put(i++, dummy);
439 }
440 {
441 // Only modify the global variable inside the mutex.
442 // If we had a race to here, the other dummy_array instances
443 // and their elements just get dropped on the floor, which is fine.
444 MutexLocker ml(THREAD, FullGCALot_lock);
445 if (_fullgc_alot_dummy_array.is_empty()) {
446 _fullgc_alot_dummy_array = OopHandle(vm_global(), dummy_array());
447 }
448 }
449 assert(i == ((objArrayOop)_fullgc_alot_dummy_array.resolve())->length(), "just checking");
450 }
451 #endif
452 }
453
454 void Universe::initialize_basic_type_mirrors(TRAPS) {
455 #if INCLUDE_CDS_JAVA_HEAP
456 if (UseSharedSpaces &&
457 ArchiveHeapLoader::are_archived_mirrors_available() &&
458 _basic_type_mirrors[T_INT].resolve() != NULL) {
459 assert(ArchiveHeapLoader::can_use(), "Sanity");
460
461 // check that all basic type mirrors are mapped also
462 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
463 if (!is_reference_type((BasicType)i)) {
464 oop m = _basic_type_mirrors[i].resolve();
465 assert(m != NULL, "archived mirrors should not be NULL");
466 }
467 }
468 } else
469 // _basic_type_mirrors[T_INT], etc, are NULL if archived heap is not mapped.
470 #endif
471 {
472 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
473 BasicType bt = (BasicType)i;
474 if (!is_reference_type(bt)) {
475 oop m = java_lang_Class::create_basic_type_mirror(type2name(bt), bt, CHECK);
476 _basic_type_mirrors[i] = OopHandle(vm_global(), m);
477 }
478 CDS_JAVA_HEAP_ONLY(_archived_basic_type_mirror_indices[i] = -1);
479 }
480 }
481 }
482
483 void Universe::fixup_mirrors(TRAPS) {
484 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
485 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
486 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
487 // that the number of objects allocated at this point is very small.
488 assert(vmClasses::Class_klass_loaded(), "java.lang.Class should be loaded");
489 HandleMark hm(THREAD);
490
491 if (!UseSharedSpaces) {
492 // Cache the start of the static fields
493 InstanceMirrorKlass::init_offset_of_static_fields();
494 }
495
496 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
497 int list_length = list->length();
498 for (int i = 0; i < list_length; i++) {
499 Klass* k = list->at(i);
500 assert(k->is_klass(), "List should only hold classes");
501 java_lang_Class::fixup_mirror(k, CATCH);
502 }
503 delete java_lang_Class::fixup_mirror_list();
504 java_lang_Class::set_fixup_mirror_list(NULL);
505 }
506
507 #define assert_pll_locked(test) \
508 assert(Heap_lock->test(), "Reference pending list access requires lock")
509
510 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
511
512 oop Universe::reference_pending_list() {
513 if (Thread::current()->is_VM_thread()) {
514 assert_pll_locked(is_locked);
515 } else {
516 assert_pll_ownership();
517 }
518 return _reference_pending_list.resolve();
519 }
520
521 void Universe::clear_reference_pending_list() {
522 assert_pll_ownership();
523 _reference_pending_list.replace(NULL);
524 }
525
526 bool Universe::has_reference_pending_list() {
527 assert_pll_ownership();
528 return _reference_pending_list.peek() != NULL;
529 }
530
531 oop Universe::swap_reference_pending_list(oop list) {
532 assert_pll_locked(is_locked);
533 return _reference_pending_list.xchg(list);
534 }
535
536 #undef assert_pll_locked
537 #undef assert_pll_ownership
538
539 static void reinitialize_vtables() {
540 // The vtables are initialized by starting at java.lang.Object and
541 // initializing through the subclass links, so that the super
542 // classes are always initialized first.
543 for (ClassHierarchyIterator iter(vmClasses::Object_klass()); !iter.done(); iter.next()) {
544 Klass* sub = iter.klass();
545 sub->vtable().initialize_vtable();
546 }
547 }
548
549 static void reinitialize_itables() {
550
551 class ReinitTableClosure : public KlassClosure {
552 public:
553 void do_klass(Klass* k) {
554 if (k->is_instance_klass()) {
555 InstanceKlass::cast(k)->itable().initialize_itable();
556 }
557 }
558 };
559
560 MutexLocker mcld(ClassLoaderDataGraph_lock);
561 ReinitTableClosure cl;
562 ClassLoaderDataGraph::classes_do(&cl);
563 }
564
565 bool Universe::on_page_boundary(void* addr) {
566 return is_aligned(addr, os::vm_page_size());
567 }
568
569 // the array of preallocated errors with backtraces
570 objArrayOop Universe::preallocated_out_of_memory_errors() {
571 return (objArrayOop)_preallocated_out_of_memory_error_array.resolve();
572 }
573
574 objArrayOop Universe::out_of_memory_errors() { return (objArrayOop)_out_of_memory_errors.resolve(); }
575
576 oop Universe::out_of_memory_error_java_heap() {
577 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_java_heap));
578 }
579
580 oop Universe::out_of_memory_error_c_heap() {
581 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_c_heap));
582 }
583
584 oop Universe::out_of_memory_error_metaspace() {
585 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_metaspace));
586 }
587
588 oop Universe::out_of_memory_error_class_metaspace() {
589 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_class_metaspace));
590 }
591
592 oop Universe::out_of_memory_error_array_size() {
593 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_array_size));
594 }
595
596 oop Universe::out_of_memory_error_gc_overhead_limit() {
597 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_gc_overhead_limit));
598 }
599
600 oop Universe::out_of_memory_error_realloc_objects() {
601 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_realloc_objects));
602 }
603
604 // Throw default _out_of_memory_error_retry object as it will never propagate out of the VM
605 oop Universe::out_of_memory_error_retry() { return out_of_memory_errors()->obj_at(_oom_retry); }
606 oop Universe::delayed_stack_overflow_error_message() { return _delayed_stack_overflow_error_message.resolve(); }
607
608
609 bool Universe::should_fill_in_stack_trace(Handle throwable) {
610 // never attempt to fill in the stack trace of preallocated errors that do not have
611 // backtrace. These errors are kept alive forever and may be "re-used" when all
612 // preallocated errors with backtrace have been consumed. Also need to avoid
613 // a potential loop which could happen if an out of memory occurs when attempting
614 // to allocate the backtrace.
615 objArrayOop preallocated_oom = out_of_memory_errors();
616 for (int i = 0; i < _oom_count; i++) {
617 if (throwable() == preallocated_oom->obj_at(i)) {
618 return false;
619 }
620 }
621 return true;
622 }
623
624
625 oop Universe::gen_out_of_memory_error(oop default_err) {
626 // generate an out of memory error:
627 // - if there is a preallocated error and stack traces are available
628 // (j.l.Throwable is initialized), then return the preallocated
629 // error with a filled in stack trace, and with the message
630 // provided by the default error.
631 // - otherwise, return the default error, without a stack trace.
632 int next;
633 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
634 vmClasses::Throwable_klass()->is_initialized()) {
635 next = (int)Atomic::add(&_preallocated_out_of_memory_error_avail_count, -1);
636 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
637 } else {
638 next = -1;
639 }
640 if (next < 0) {
641 // all preallocated errors have been used.
642 // return default
643 return default_err;
644 } else {
645 JavaThread* current = JavaThread::current();
646 Handle default_err_h(current, default_err);
647 // get the error object at the slot and set set it to NULL so that the
648 // array isn't keeping it alive anymore.
649 Handle exc(current, preallocated_out_of_memory_errors()->obj_at(next));
650 assert(exc() != NULL, "slot has been used already");
651 preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
652
653 // use the message from the default error
654 oop msg = java_lang_Throwable::message(default_err_h());
655 assert(msg != NULL, "no message");
656 java_lang_Throwable::set_message(exc(), msg);
657
658 // populate the stack trace and return it.
659 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
660 return exc();
661 }
662 }
663
664 bool Universe::is_out_of_memory_error_metaspace(oop ex_obj) {
665 return java_lang_Throwable::message(ex_obj) == _msg_metaspace.resolve();
666 }
667
668 bool Universe::is_out_of_memory_error_class_metaspace(oop ex_obj) {
669 return java_lang_Throwable::message(ex_obj) == _msg_class_metaspace.resolve();
670 }
671
672 // Setup preallocated OutOfMemoryError errors
673 void Universe::create_preallocated_out_of_memory_errors(TRAPS) {
674 InstanceKlass* ik = vmClasses::OutOfMemoryError_klass();
675 objArrayOop oa = oopFactory::new_objArray(ik, _oom_count, CHECK);
676 objArrayHandle oom_array(THREAD, oa);
677
678 for (int i = 0; i < _oom_count; i++) {
679 oop oom_obj = ik->allocate_instance(CHECK);
680 oom_array->obj_at_put(i, oom_obj);
681 }
682 _out_of_memory_errors = OopHandle(vm_global(), oom_array());
683
684 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK);
685 java_lang_Throwable::set_message(oom_array->obj_at(_oom_java_heap), msg());
686
687 msg = java_lang_String::create_from_str("C heap space", CHECK);
688 java_lang_Throwable::set_message(oom_array->obj_at(_oom_c_heap), msg());
689
690 msg = java_lang_String::create_from_str("Metaspace", CHECK);
691 _msg_metaspace = OopHandle(vm_global(), msg());
692 java_lang_Throwable::set_message(oom_array->obj_at(_oom_metaspace), msg());
693
694 msg = java_lang_String::create_from_str("Compressed class space", CHECK);
695 _msg_class_metaspace = OopHandle(vm_global(), msg());
696 java_lang_Throwable::set_message(oom_array->obj_at(_oom_class_metaspace), msg());
697
698 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK);
699 java_lang_Throwable::set_message(oom_array->obj_at(_oom_array_size), msg());
700
701 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK);
702 java_lang_Throwable::set_message(oom_array->obj_at(_oom_gc_overhead_limit), msg());
703
704 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK);
705 java_lang_Throwable::set_message(oom_array->obj_at(_oom_realloc_objects), msg());
706
707 msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK);
708 java_lang_Throwable::set_message(oom_array->obj_at(_oom_retry), msg());
709
710 // Setup the array of errors that have preallocated backtrace
711 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
712 objArrayOop instance = oopFactory::new_objArray(ik, len, CHECK);
713 _preallocated_out_of_memory_error_array = OopHandle(vm_global(), instance);
714 objArrayHandle preallocated_oom_array(THREAD, instance);
715
716 for (int i=0; i<len; i++) {
717 oop err = ik->allocate_instance(CHECK);
718 Handle err_h(THREAD, err);
719 java_lang_Throwable::allocate_backtrace(err_h, CHECK);
720 preallocated_oom_array->obj_at_put(i, err_h());
721 }
722 _preallocated_out_of_memory_error_avail_count = (jint)len;
723 }
724
725 intptr_t Universe::_non_oop_bits = 0;
726
727 void* Universe::non_oop_word() {
728 // Neither the high bits nor the low bits of this value is allowed
729 // to look like (respectively) the high or low bits of a real oop.
730 //
731 // High and low are CPU-specific notions, but low always includes
732 // the low-order bit. Since oops are always aligned at least mod 4,
733 // setting the low-order bit will ensure that the low half of the
734 // word will never look like that of a real oop.
735 //
736 // Using the OS-supplied non-memory-address word (usually 0 or -1)
737 // will take care of the high bits, however many there are.
738
739 if (_non_oop_bits == 0) {
740 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
741 }
742
743 return (void*)_non_oop_bits;
744 }
745
746 bool Universe::contains_non_oop_word(void* p) {
747 return *(void**)p == non_oop_word();
748 }
749
750 static void initialize_global_behaviours() {
751 CompiledICProtectionBehaviour::set_current(new DefaultICProtectionBehaviour());
752 }
753
754 jint universe_init() {
755 assert(!Universe::_fully_initialized, "called after initialize_vtables");
756 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
757 "LogHeapWordSize is incorrect.");
758 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
759 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
760 "oop size is not not a multiple of HeapWord size");
761
762 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
763
764 initialize_global_behaviours();
765
766 GCLogPrecious::initialize();
767
768 #ifdef _LP64
769 MetaspaceShared::adjust_heap_sizes_for_dumping();
770 #endif // _LP64
771
772 GCConfig::arguments()->initialize_heap_sizes();
773
774 jint status = Universe::initialize_heap();
775 if (status != JNI_OK) {
776 return status;
777 }
778
779 Universe::initialize_tlab();
780
781 Metaspace::global_initialize();
782
783 // Initialize performance counters for metaspaces
784 MetaspaceCounters::initialize_performance_counters();
785
786 // Checks 'AfterMemoryInit' constraints.
787 if (!JVMFlagLimit::check_all_constraints(JVMFlagConstraintPhase::AfterMemoryInit)) {
788 return JNI_EINVAL;
789 }
790
791 // Create memory for metadata. Must be after initializing heap for
792 // DumpSharedSpaces.
793 ClassLoaderData::init_null_class_loader_data();
794
795 // We have a heap so create the Method* caches before
796 // Metaspace::initialize_shared_spaces() tries to populate them.
797 Universe::_finalizer_register_cache = new LatestMethodCache();
798 Universe::_loader_addClass_cache = new LatestMethodCache();
799 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
800 Universe::_throw_no_such_method_error_cache = new LatestMethodCache();
801 Universe::_do_stack_walk_cache = new LatestMethodCache();
802
803 #if INCLUDE_CDS
804 DynamicArchive::check_for_dynamic_dump();
805 if (UseSharedSpaces) {
806 // Read the data structures supporting the shared spaces (shared
807 // system dictionary, symbol table, etc.). After that, access to
808 // the file (other than the mapped regions) is no longer needed, and
809 // the file is closed. Closing the file does not affect the
810 // currently mapped regions.
811 MetaspaceShared::initialize_shared_spaces();
812 StringTable::create_table();
813 if (ArchiveHeapLoader::is_loaded()) {
814 StringTable::transfer_shared_strings_to_local_table();
815 }
816 } else
817 #endif
818 {
819 SymbolTable::create_table();
820 StringTable::create_table();
821 }
822
823 #if INCLUDE_CDS
824 if (Arguments::is_dumping_archive()) {
825 MetaspaceShared::prepare_for_dumping();
826 }
827 #endif
828
829 if (strlen(VerifySubSet) > 0) {
830 Universe::initialize_verify_flags();
831 }
832
833 ResolvedMethodTable::create_table();
834
835 return JNI_OK;
836 }
837
838 jint Universe::initialize_heap() {
839 assert(_collectedHeap == NULL, "Heap already created");
840 _collectedHeap = GCConfig::arguments()->create_heap();
841
842 log_info(gc)("Using %s", _collectedHeap->name());
843 return _collectedHeap->initialize();
844 }
845
846 void Universe::initialize_tlab() {
847 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
848 PLAB::startup_initialization();
849 if (UseTLAB) {
850 ThreadLocalAllocBuffer::startup_initialization();
851 }
852 }
853
854 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
855
856 assert(alignment <= Arguments::conservative_max_heap_alignment(),
857 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
858 alignment, Arguments::conservative_max_heap_alignment());
859
860 size_t total_reserved = align_up(heap_size, alignment);
861 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
862 "heap size is too big for compressed oops");
863
864 size_t page_size = os::vm_page_size();
865 if (UseLargePages && is_aligned(alignment, os::large_page_size())) {
866 page_size = os::large_page_size();
867 } else {
868 // Parallel is the only collector that might opt out of using large pages
869 // for the heap.
870 assert(!UseLargePages || UseParallelGC , "Wrong alignment to use large pages");
871 }
872
873 // Now create the space.
874 ReservedHeapSpace total_rs(total_reserved, alignment, page_size, AllocateHeapAt);
875
876 if (total_rs.is_reserved()) {
877 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
878 "must be exactly of required size and alignment");
879 // We are good.
880
881 if (AllocateHeapAt != NULL) {
882 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
883 }
884
885 if (UseCompressedOops) {
886 CompressedOops::initialize(total_rs);
887 }
888
889 Universe::calculate_verify_data((HeapWord*)total_rs.base(), (HeapWord*)total_rs.end());
890
891 return total_rs;
892 }
893
894 vm_exit_during_initialization(
895 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
896 total_reserved/K));
897
898 // satisfy compiler
899 ShouldNotReachHere();
900 return ReservedHeapSpace(0, 0, os::vm_page_size());
901 }
902
903 OopStorage* Universe::vm_weak() {
904 return Universe::_vm_weak;
905 }
906
907 OopStorage* Universe::vm_global() {
908 return Universe::_vm_global;
909 }
910
911 void Universe::oopstorage_init() {
912 Universe::_vm_global = OopStorageSet::create_strong("VM Global", mtInternal);
913 Universe::_vm_weak = OopStorageSet::create_weak("VM Weak", mtInternal);
914 }
915
916 void universe_oopstorage_init() {
917 Universe::oopstorage_init();
918 }
919
920 void initialize_known_method(LatestMethodCache* method_cache,
921 InstanceKlass* ik,
922 const char* method,
923 Symbol* signature,
924 bool is_static, TRAPS)
925 {
926 TempNewSymbol name = SymbolTable::new_symbol(method);
927 Method* m = NULL;
928 // The klass must be linked before looking up the method.
929 if (!ik->link_class_or_fail(THREAD) ||
930 ((m = ik->find_method(name, signature)) == NULL) ||
931 is_static != m->is_static()) {
932 ResourceMark rm(THREAD);
933 // NoSuchMethodException doesn't actually work because it tries to run the
934 // <init> function before java_lang_Class is linked. Print error and exit.
935 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
936 ik->name()->as_C_string(), method));
937 }
938 method_cache->init(ik, m);
939 }
940
941 void Universe::initialize_known_methods(TRAPS) {
942 // Set up static method for registering finalizers
943 initialize_known_method(_finalizer_register_cache,
944 vmClasses::Finalizer_klass(),
945 "register",
946 vmSymbols::object_void_signature(), true, CHECK);
947
948 initialize_known_method(_throw_illegal_access_error_cache,
949 vmClasses::internal_Unsafe_klass(),
950 "throwIllegalAccessError",
951 vmSymbols::void_method_signature(), true, CHECK);
952
953 initialize_known_method(_throw_no_such_method_error_cache,
954 vmClasses::internal_Unsafe_klass(),
955 "throwNoSuchMethodError",
956 vmSymbols::void_method_signature(), true, CHECK);
957
958 // Set up method for registering loaded classes in class loader vector
959 initialize_known_method(_loader_addClass_cache,
960 vmClasses::ClassLoader_klass(),
961 "addClass",
962 vmSymbols::class_void_signature(), false, CHECK);
963
964 // Set up method for stack walking
965 initialize_known_method(_do_stack_walk_cache,
966 vmClasses::AbstractStackWalker_klass(),
967 "doStackWalk",
968 vmSymbols::doStackWalk_signature(), false, CHECK);
969 }
970
971 void universe2_init() {
972 EXCEPTION_MARK;
973 Universe::genesis(CATCH);
974 }
975
976 // Set after initialization of the module runtime, call_initModuleRuntime
977 void universe_post_module_init() {
978 Universe::_module_initialized = true;
979 }
980
981 bool universe_post_init() {
982 assert(!is_init_completed(), "Error: initialization not yet completed!");
983 Universe::_fully_initialized = true;
984 EXCEPTION_MARK;
985 if (!UseSharedSpaces) {
986 reinitialize_vtables();
987 reinitialize_itables();
988 }
989
990 HandleMark hm(THREAD);
991 // Setup preallocated empty java.lang.Class array for Method reflection.
992
993 objArrayOop the_empty_class_array = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_false);
994 Universe::_the_empty_class_array = OopHandle(Universe::vm_global(), the_empty_class_array);
995
996 // Setup preallocated OutOfMemoryError errors
997 Universe::create_preallocated_out_of_memory_errors(CHECK_false);
998
999 oop instance;
1000 // Setup preallocated cause message for delayed StackOverflowError
1001 if (StackReservedPages > 0) {
1002 instance = java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
1003 Universe::_delayed_stack_overflow_error_message = OopHandle(Universe::vm_global(), instance);
1004 }
1005
1006 // Setup preallocated NullPointerException
1007 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1008 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
1009 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1010 Universe::_null_ptr_exception_instance = OopHandle(Universe::vm_global(), instance);
1011
1012 // Setup preallocated ArithmeticException
1013 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1014 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
1015 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1016 Universe::_arithmetic_exception_instance = OopHandle(Universe::vm_global(), instance);
1017
1018 // Virtual Machine Error for when we get into a situation we can't resolve
1019 k = vmClasses::VirtualMachineError_klass();
1020 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1021 if (!linked) {
1022 tty->print_cr("Unable to link/verify VirtualMachineError class");
1023 return false; // initialization failed
1024 }
1025 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1026 Universe::_virtual_machine_error_instance = OopHandle(Universe::vm_global(), instance);
1027
1028 Handle msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1029 java_lang_Throwable::set_message(Universe::arithmetic_exception_instance(), msg());
1030
1031 Universe::initialize_known_methods(CHECK_false);
1032
1033 // This needs to be done before the first scavenge/gc, since
1034 // it's an input to soft ref clearing policy.
1035 {
1036 MutexLocker x(THREAD, Heap_lock);
1037 Universe::heap()->update_capacity_and_used_at_gc();
1038 }
1039
1040 // ("weak") refs processing infrastructure initialization
1041 Universe::heap()->post_initialize();
1042
1043 MemoryService::add_metaspace_memory_pools();
1044
1045 MemoryService::set_universe_heap(Universe::heap());
1046 #if INCLUDE_CDS
1047 MetaspaceShared::post_initialize(CHECK_false);
1048 #endif
1049 return true;
1050 }
1051
1052
1053 void Universe::compute_base_vtable_size() {
1054 _base_vtable_size = ClassLoader::compute_Object_vtable();
1055 }
1056
1057 void Universe::print_on(outputStream* st) {
1058 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1059 st->print_cr("Heap");
1060 heap()->print_on(st);
1061 }
1062
1063 void Universe::print_heap_at_SIGBREAK() {
1064 if (PrintHeapAtSIGBREAK) {
1065 print_on(tty);
1066 tty->cr();
1067 tty->flush();
1068 }
1069 }
1070
1071 void Universe::initialize_verify_flags() {
1072 verify_flags = 0;
1073 const char delimiter[] = " ,";
1074
1075 size_t length = strlen(VerifySubSet);
1076 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1077 strncpy(subset_list, VerifySubSet, length + 1);
1078 char* save_ptr;
1079
1080 char* token = strtok_r(subset_list, delimiter, &save_ptr);
1081 while (token != NULL) {
1082 if (strcmp(token, "threads") == 0) {
1083 verify_flags |= Verify_Threads;
1084 } else if (strcmp(token, "heap") == 0) {
1085 verify_flags |= Verify_Heap;
1086 } else if (strcmp(token, "symbol_table") == 0) {
1087 verify_flags |= Verify_SymbolTable;
1088 } else if (strcmp(token, "string_table") == 0) {
1089 verify_flags |= Verify_StringTable;
1090 } else if (strcmp(token, "codecache") == 0) {
1091 verify_flags |= Verify_CodeCache;
1092 } else if (strcmp(token, "dictionary") == 0) {
1093 verify_flags |= Verify_SystemDictionary;
1094 } else if (strcmp(token, "classloader_data_graph") == 0) {
1095 verify_flags |= Verify_ClassLoaderDataGraph;
1096 } else if (strcmp(token, "metaspace") == 0) {
1097 verify_flags |= Verify_MetaspaceUtils;
1098 } else if (strcmp(token, "jni_handles") == 0) {
1099 verify_flags |= Verify_JNIHandles;
1100 } else if (strcmp(token, "codecache_oops") == 0) {
1101 verify_flags |= Verify_CodeCacheOops;
1102 } else if (strcmp(token, "resolved_method_table") == 0) {
1103 verify_flags |= Verify_ResolvedMethodTable;
1104 } else if (strcmp(token, "stringdedup") == 0) {
1105 verify_flags |= Verify_StringDedup;
1106 } else {
1107 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1108 }
1109 token = strtok_r(NULL, delimiter, &save_ptr);
1110 }
1111 FREE_C_HEAP_ARRAY(char, subset_list);
1112 }
1113
1114 bool Universe::should_verify_subset(uint subset) {
1115 if (verify_flags & subset) {
1116 return true;
1117 }
1118 return false;
1119 }
1120
1121 void Universe::verify(VerifyOption option, const char* prefix) {
1122 COMPILER2_PRESENT(
1123 assert(!DerivedPointerTable::is_active(),
1124 "DPT should not be active during verification "
1125 "(of thread stacks below)");
1126 )
1127
1128 Thread* thread = Thread::current();
1129 ResourceMark rm(thread);
1130 HandleMark hm(thread); // Handles created during verification can be zapped
1131 _verify_count++;
1132
1133 FormatBuffer<> title("Verifying %s", prefix);
1134 GCTraceTime(Info, gc, verify) tm(title.buffer());
1135 if (should_verify_subset(Verify_Threads)) {
1136 log_debug(gc, verify)("Threads");
1137 Threads::verify();
1138 }
1139 if (should_verify_subset(Verify_Heap)) {
1140 log_debug(gc, verify)("Heap");
1141 heap()->verify(option);
1142 }
1143 if (should_verify_subset(Verify_SymbolTable)) {
1144 log_debug(gc, verify)("SymbolTable");
1145 SymbolTable::verify();
1146 }
1147 if (should_verify_subset(Verify_StringTable)) {
1148 log_debug(gc, verify)("StringTable");
1149 StringTable::verify();
1150 }
1151 if (should_verify_subset(Verify_CodeCache)) {
1152 log_debug(gc, verify)("CodeCache");
1153 CodeCache::verify();
1154 }
1155 if (should_verify_subset(Verify_SystemDictionary)) {
1156 log_debug(gc, verify)("SystemDictionary");
1157 SystemDictionary::verify();
1158 }
1159 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1160 log_debug(gc, verify)("ClassLoaderDataGraph");
1161 ClassLoaderDataGraph::verify();
1162 }
1163 if (should_verify_subset(Verify_MetaspaceUtils)) {
1164 log_debug(gc, verify)("MetaspaceUtils");
1165 DEBUG_ONLY(MetaspaceUtils::verify();)
1166 }
1167 if (should_verify_subset(Verify_JNIHandles)) {
1168 log_debug(gc, verify)("JNIHandles");
1169 JNIHandles::verify();
1170 }
1171 if (should_verify_subset(Verify_CodeCacheOops)) {
1172 log_debug(gc, verify)("CodeCache Oops");
1173 CodeCache::verify_oops();
1174 }
1175 if (should_verify_subset(Verify_ResolvedMethodTable)) {
1176 log_debug(gc, verify)("ResolvedMethodTable Oops");
1177 ResolvedMethodTable::verify();
1178 }
1179 if (should_verify_subset(Verify_StringDedup)) {
1180 log_debug(gc, verify)("String Deduplication");
1181 StringDedup::verify();
1182 }
1183 }
1184
1185
1186 #ifndef PRODUCT
1187 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1188 assert(low_boundary < high_boundary, "bad interval");
1189
1190 // decide which low-order bits we require to be clear:
1191 size_t alignSize = MinObjAlignmentInBytes;
1192 size_t min_object_size = CollectedHeap::min_fill_size();
1193
1194 // make an inclusive limit:
1195 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1196 uintptr_t min = (uintptr_t)low_boundary;
1197 assert(min < max, "bad interval");
1198 uintptr_t diff = max ^ min;
1199
1200 // throw away enough low-order bits to make the diff vanish
1201 uintptr_t mask = (uintptr_t)(-1);
1202 while ((mask & diff) != 0)
1203 mask <<= 1;
1204 uintptr_t bits = (min & mask);
1205 assert(bits == (max & mask), "correct mask");
1206 // check an intermediate value between min and max, just to make sure:
1207 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1208
1209 // require address alignment, too:
1210 mask |= (alignSize - 1);
1211
1212 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1213 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1214 }
1215 _verify_oop_mask = mask;
1216 _verify_oop_bits = bits;
1217 }
1218
1219 // Oop verification (see MacroAssembler::verify_oop)
1220
1221 uintptr_t Universe::verify_oop_mask() {
1222 return _verify_oop_mask;
1223 }
1224
1225 uintptr_t Universe::verify_oop_bits() {
1226 return _verify_oop_bits;
1227 }
1228
1229 uintptr_t Universe::verify_mark_mask() {
1230 return markWord::lock_mask_in_place;
1231 }
1232
1233 uintptr_t Universe::verify_mark_bits() {
1234 intptr_t mask = verify_mark_mask();
1235 intptr_t bits = (intptr_t)markWord::prototype().value();
1236 assert((bits & ~mask) == 0, "no stray header bits");
1237 return bits;
1238 }
1239 #endif // PRODUCT
1240
1241
1242 void LatestMethodCache::init(Klass* k, Method* m) {
1243 if (!UseSharedSpaces) {
1244 _klass = k;
1245 }
1246 #ifndef PRODUCT
1247 else {
1248 // sharing initialization should have already set up _klass
1249 assert(_klass != NULL, "just checking");
1250 }
1251 #endif
1252
1253 _method_idnum = m->method_idnum();
1254 assert(_method_idnum >= 0, "sanity check");
1255 }
1256
1257
1258 Method* LatestMethodCache::get_method() {
1259 if (klass() == NULL) return NULL;
1260 InstanceKlass* ik = InstanceKlass::cast(klass());
1261 Method* m = ik->method_with_idnum(method_idnum());
1262 assert(m != NULL, "sanity check");
1263 return m;
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 _fullgc_alot_dummy_array = OopHandle(); // NULL out OopStorage pointer.
1276 return false;
1277 }
1278
1279 // Release dummy at bottom of old generation
1280 fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1281 }
1282 return true;
1283 }
1284
1285 bool Universe::is_gc_active() {
1286 return heap()->is_gc_active();
1287 }
1288
1289 bool Universe::is_in_heap(const void* p) {
1290 return heap()->is_in(p);
1291 }
1292
1293 #endif // ASSERT