1 /*
2 * Copyright (c) 1997, 2021, 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/heapShared.hpp"
27 #include "cds/metaspaceShared.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderDataGraph.hpp"
30 #include "classfile/javaClasses.hpp"
31 #include "classfile/stringTable.hpp"
32 #include "classfile/symbolTable.hpp"
33 #include "classfile/systemDictionary.hpp"
34 #include "classfile/vmClasses.hpp"
35 #include "classfile/vmSymbols.hpp"
36 #include "code/codeBehaviours.hpp"
37 #include "code/codeCache.hpp"
38 #include "compiler/oopMap.hpp"
39 #include "gc/shared/collectedHeap.inline.hpp"
40 #include "gc/shared/gcArguments.hpp"
41 #include "gc/shared/gcConfig.hpp"
42 #include "gc/shared/gcLogPrecious.hpp"
43 #include "gc/shared/gcTraceTime.inline.hpp"
44 #include "gc/shared/oopStorageSet.hpp"
45 #include "gc/shared/stringdedup/stringDedup.hpp"
46 #include "gc/shared/tlab_globals.hpp"
47 #include "logging/log.hpp"
48 #include "logging/logStream.hpp"
49 #include "memory/metadataFactory.hpp"
50 #include "memory/metaspaceClosure.hpp"
51 #include "memory/metaspaceCounters.hpp"
52 #include "memory/metaspaceUtils.hpp"
53 #include "memory/oopFactory.hpp"
54 #include "memory/resourceArea.hpp"
55 #include "memory/universe.hpp"
56 #include "oops/compressedOops.hpp"
57 #include "oops/instanceKlass.hpp"
58 #include "oops/instanceMirrorKlass.hpp"
59 #include "oops/klass.inline.hpp"
60 #include "oops/objArrayOop.inline.hpp"
61 #include "oops/oop.inline.hpp"
62 #include "oops/oopHandle.inline.hpp"
63 #include "oops/typeArrayKlass.hpp"
64 #include "prims/resolvedMethodTable.hpp"
65 #include "runtime/arguments.hpp"
66 #include "runtime/atomic.hpp"
67 #include "runtime/flags/jvmFlagLimit.hpp"
68 #include "runtime/handles.inline.hpp"
69 #include "runtime/init.hpp"
70 #include "runtime/java.hpp"
71 #include "runtime/jniHandles.hpp"
72 #include "runtime/thread.inline.hpp"
73 #include "runtime/timerTrace.hpp"
74 #include "services/memoryService.hpp"
75 #include "utilities/align.hpp"
76 #include "utilities/autoRestore.hpp"
77 #include "utilities/debug.hpp"
78 #include "utilities/formatBuffer.hpp"
79 #include "utilities/macros.hpp"
80 #include "utilities/ostream.hpp"
81 #include "utilities/preserveException.hpp"
82
83 // Known objects
84 Klass* Universe::_typeArrayKlassObjs[T_LONG+1] = { NULL /*, NULL...*/ };
85 Klass* Universe::_objectArrayKlassObj = NULL;
86 OopHandle Universe::_mirrors[T_VOID+1];
87
88 OopHandle Universe::_main_thread_group;
89 OopHandle Universe::_system_thread_group;
90 OopHandle Universe::_the_empty_class_array;
91 OopHandle Universe::_the_null_string;
92 OopHandle Universe::_the_min_jint_string;
93
94 OopHandle Universe::_the_null_sentinel;
95
96 // _out_of_memory_errors is an objArray
97 enum OutOfMemoryInstance { _oom_java_heap,
98 _oom_c_heap,
99 _oom_metaspace,
100 _oom_class_metaspace,
101 _oom_array_size,
102 _oom_gc_overhead_limit,
103 _oom_realloc_objects,
104 _oom_retry,
105 _oom_count };
106
107 OopHandle Universe::_out_of_memory_errors;
108 OopHandle Universe::_delayed_stack_overflow_error_message;
109 OopHandle Universe::_preallocated_out_of_memory_error_array;
110 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
111
112 OopHandle Universe::_null_ptr_exception_instance;
113 OopHandle Universe::_arithmetic_exception_instance;
114 OopHandle Universe::_virtual_machine_error_instance;
115
116 OopHandle Universe::_reference_pending_list;
117
118 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
119 LatestMethodCache* Universe::_finalizer_register_cache = NULL;
120 LatestMethodCache* Universe::_loader_addClass_cache = NULL;
121 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL;
122 LatestMethodCache* Universe::_throw_no_such_method_error_cache = NULL;
123 LatestMethodCache* Universe::_do_stack_walk_cache = NULL;
124 LatestMethodCache* Universe::_is_substitutable_cache = NULL;
125 LatestMethodCache* Universe::_primitive_type_hash_code_cache = NULL;
126
127 long Universe::verify_flags = Universe::Verify_All;
128
129 Array<int>* Universe::_the_empty_int_array = NULL;
130 Array<u2>* Universe::_the_empty_short_array = NULL;
131 Array<Klass*>* Universe::_the_empty_klass_array = NULL;
132 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = NULL;
133 Array<InstanceKlass*>* Universe::_the_single_IdentityObject_klass_array = NULL;
134 Array<InstanceKlass*>* Universe::_the_single_PrimitiveObject_klass_array = NULL;
135 Array<Method*>* Universe::_the_empty_method_array = NULL;
136
137 // These variables are guarded by FullGCALot_lock.
138 debug_only(OopHandle Universe::_fullgc_alot_dummy_array;)
139 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
140
141 // Heap
142 int Universe::_verify_count = 0;
143
144 // Oop verification (see MacroAssembler::verify_oop)
145 uintptr_t Universe::_verify_oop_mask = 0;
146 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
147
148 int Universe::_base_vtable_size = 0;
149 bool Universe::_bootstrapping = false;
150 bool Universe::_module_initialized = false;
151 bool Universe::_fully_initialized = false;
152
153 OopStorage* Universe::_vm_weak = NULL;
154 OopStorage* Universe::_vm_global = NULL;
155
156 CollectedHeap* Universe::_collectedHeap = NULL;
157
158 objArrayOop Universe::the_empty_class_array () {
159 return (objArrayOop)_the_empty_class_array.resolve();
160 }
161
162 oop Universe::main_thread_group() { return _main_thread_group.resolve(); }
163 void Universe::set_main_thread_group(oop group) { _main_thread_group = OopHandle(vm_global(), group); }
164
165 oop Universe::system_thread_group() { return _system_thread_group.resolve(); }
166 void Universe::set_system_thread_group(oop group) { _system_thread_group = OopHandle(vm_global(), group); }
167
168 oop Universe::the_null_string() { return _the_null_string.resolve(); }
169 oop Universe::the_min_jint_string() { return _the_min_jint_string.resolve(); }
170
171 oop Universe::null_ptr_exception_instance() { return _null_ptr_exception_instance.resolve(); }
172 oop Universe::arithmetic_exception_instance() { return _arithmetic_exception_instance.resolve(); }
173 oop Universe::virtual_machine_error_instance() { return _virtual_machine_error_instance.resolve(); }
174
175 oop Universe::the_null_sentinel() { return _the_null_sentinel.resolve(); }
176
177 oop Universe::int_mirror() { return check_mirror(_mirrors[T_INT].resolve()); }
178 oop Universe::float_mirror() { return check_mirror(_mirrors[T_FLOAT].resolve()); }
179 oop Universe::double_mirror() { return check_mirror(_mirrors[T_DOUBLE].resolve()); }
180 oop Universe::byte_mirror() { return check_mirror(_mirrors[T_BYTE].resolve()); }
181 oop Universe::bool_mirror() { return check_mirror(_mirrors[T_BOOLEAN].resolve()); }
182 oop Universe::char_mirror() { return check_mirror(_mirrors[T_CHAR].resolve()); }
183 oop Universe::long_mirror() { return check_mirror(_mirrors[T_LONG].resolve()); }
184 oop Universe::short_mirror() { return check_mirror(_mirrors[T_SHORT].resolve()); }
185 oop Universe::void_mirror() { return check_mirror(_mirrors[T_VOID].resolve()); }
186
187 oop Universe::java_mirror(BasicType t) {
188 assert((uint)t < T_VOID+1, "range check");
189 return check_mirror(_mirrors[t].resolve());
190 }
191
192 // Used by CDS dumping
193 void Universe::replace_mirror(BasicType t, oop new_mirror) {
194 Universe::_mirrors[t].replace(new_mirror);
195 }
196
197 void Universe::basic_type_classes_do(void f(Klass*)) {
198 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
199 f(_typeArrayKlassObjs[i]);
200 }
201 }
202
203 void Universe::basic_type_classes_do(KlassClosure *closure) {
204 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
205 closure->do_klass(_typeArrayKlassObjs[i]);
206 }
207 }
208
209 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
210 it->push(&_klass);
211 }
212
213 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
214 for (int i = 0; i < T_LONG+1; i++) {
215 it->push(&_typeArrayKlassObjs[i]);
216 }
217 it->push(&_objectArrayKlassObj);
218
219 it->push(&_the_empty_int_array);
220 it->push(&_the_empty_short_array);
221 it->push(&_the_empty_klass_array);
222 it->push(&_the_empty_instance_klass_array);
223 it->push(&_the_empty_method_array);
224 it->push(&_the_array_interfaces_array);
225 it->push(&_the_single_IdentityObject_klass_array);
226 it->push(&_the_single_PrimitiveObject_klass_array);
227
228 _finalizer_register_cache->metaspace_pointers_do(it);
229 _loader_addClass_cache->metaspace_pointers_do(it);
230 _throw_illegal_access_error_cache->metaspace_pointers_do(it);
231 _throw_no_such_method_error_cache->metaspace_pointers_do(it);
232 _do_stack_walk_cache->metaspace_pointers_do(it);
233 _is_substitutable_cache->metaspace_pointers_do(it);
234 _primitive_type_hash_code_cache->metaspace_pointers_do(it);
235 }
236
237 // Serialize metadata and pointers to primitive type mirrors in and out of CDS archive
238 void Universe::serialize(SerializeClosure* f) {
239
240 #if INCLUDE_CDS_JAVA_HEAP
241 {
242 oop mirror_oop;
243 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
244 if (f->reading()) {
245 f->do_oop(&mirror_oop); // read from archive
246 assert(oopDesc::is_oop_or_null(mirror_oop), "is oop");
247 // Only create an OopHandle for non-null mirrors
248 if (mirror_oop != NULL) {
249 _mirrors[i] = OopHandle(vm_global(), mirror_oop);
250 }
251 } else {
252 if (HeapShared::can_write()) {
253 mirror_oop = _mirrors[i].resolve();
254 } else {
255 mirror_oop = NULL;
256 }
257 f->do_oop(&mirror_oop); // write to archive
258 }
259 if (mirror_oop != NULL) { // may be null if archived heap is disabled
260 java_lang_Class::update_archived_primitive_mirror_native_pointers(mirror_oop);
261 }
262 }
263 }
264 #endif
265
266 for (int i = 0; i < T_LONG+1; i++) {
267 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
268 }
269
270 f->do_ptr((void**)&_objectArrayKlassObj);
271 f->do_ptr((void**)&_the_array_interfaces_array);
272 f->do_ptr((void**)&_the_empty_int_array);
273 f->do_ptr((void**)&_the_empty_short_array);
274 f->do_ptr((void**)&_the_empty_method_array);
275 f->do_ptr((void**)&_the_empty_klass_array);
276 f->do_ptr((void**)&_the_empty_instance_klass_array);
277 f->do_ptr((void**)&_the_single_IdentityObject_klass_array);
278 f->do_ptr((void**)&_the_single_PrimitiveObject_klass_array);
279 _finalizer_register_cache->serialize(f);
280 _loader_addClass_cache->serialize(f);
281 _throw_illegal_access_error_cache->serialize(f);
282 _throw_no_such_method_error_cache->serialize(f);
283 _do_stack_walk_cache->serialize(f);
284 _is_substitutable_cache->serialize(f);
285 _primitive_type_hash_code_cache->serialize(f);
286 }
287
288
289 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
290 if (size < alignment || size % alignment != 0) {
291 vm_exit_during_initialization(
292 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
293 }
294 }
295
296 void initialize_basic_type_klass(Klass* k, TRAPS) {
297 Klass* ok = vmClasses::Object_klass();
298 #if INCLUDE_CDS
299 if (UseSharedSpaces) {
300 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
301 assert(k->super() == ok, "u3");
302 if (k->is_instance_klass()) {
303 InstanceKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), NULL, CHECK);
304 } else {
305 ArrayKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), CHECK);
306 }
307 } else
308 #endif
309 {
310 k->initialize_supers(ok, NULL, CHECK);
311 }
312 k->append_to_sibling_list();
313 }
314
315 void Universe::genesis(TRAPS) {
316 ResourceMark rm(THREAD);
317 HandleMark hm(THREAD);
318
319 { AutoModifyRestore<bool> temporarily(_bootstrapping, true);
320
321 { MutexLocker mc(THREAD, Compile_lock);
322
323 java_lang_Class::allocate_fixup_lists();
324
325 // determine base vtable size; without that we cannot create the array klasses
326 compute_base_vtable_size();
327
328 if (!UseSharedSpaces) {
329 for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
330 _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK);
331 }
332
333 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
334
335 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 3, NULL, CHECK);
336 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
337 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
338 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
339 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
340 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK);
341 }
342 }
343
344 vmSymbols::initialize();
345
346 SystemDictionary::initialize(CHECK);
347
348 // Create string constants
349 oop s = StringTable::intern("null", CHECK);
350 _the_null_string = OopHandle(vm_global(), s);
351 s = StringTable::intern("-2147483648", CHECK);
352 _the_min_jint_string = OopHandle(vm_global(), s);
353
354
355 #if INCLUDE_CDS
356 if (UseSharedSpaces) {
357 // Verify shared interfaces array.
358 assert(_the_array_interfaces_array->at(0) ==
359 vmClasses::Cloneable_klass(), "u3");
360 assert(_the_array_interfaces_array->at(1) ==
361 vmClasses::Serializable_klass(), "u3");
362 assert(_the_array_interfaces_array->at(2) ==
363 vmClasses::IdentityObject_klass(), "u3");
364
365 assert(_the_single_IdentityObject_klass_array->at(0) ==
366 vmClasses::IdentityObject_klass(), "u3");
367 assert(_the_single_PrimitiveObject_klass_array->at(0) ==
368 vmClasses::PrimitiveObject_klass(), "u3");
369 } else
370 #endif
371 {
372 // Set up shared interfaces array. (Do this before supers are set up.)
373 _the_array_interfaces_array->at_put(0, vmClasses::Cloneable_klass());
374 _the_array_interfaces_array->at_put(1, vmClasses::Serializable_klass());
375 _the_array_interfaces_array->at_put(2, vmClasses::IdentityObject_klass());
376 }
377
378 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
379 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
380 initialize_basic_type_klass(floatArrayKlassObj(), CHECK);
381 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
382 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
383 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
384 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
385 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
386 } // end of core bootstrapping
387
388 {
389 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
390 _the_null_sentinel = OopHandle(vm_global(), tns());
391 }
392
393 // Create a handle for reference_pending_list
394 _reference_pending_list = OopHandle(vm_global(), NULL);
395
396 // Maybe this could be lifted up now that object array can be initialized
397 // during the bootstrapping.
398
399 // OLD
400 // Initialize _objectArrayKlass after core bootstraping to make
401 // sure the super class is set up properly for _objectArrayKlass.
402 // ---
403 // NEW
404 // Since some of the old system object arrays have been converted to
405 // ordinary object arrays, _objectArrayKlass will be loaded when
406 // SystemDictionary::initialize(CHECK); is run. See the extra check
407 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
408 _objectArrayKlassObj = InstanceKlass::
409 cast(vmClasses::Object_klass())->array_klass(1, CHECK);
410 // OLD
411 // Add the class to the class hierarchy manually to make sure that
412 // its vtable is initialized after core bootstrapping is completed.
413 // ---
414 // New
415 // Have already been initialized.
416 _objectArrayKlassObj->append_to_sibling_list();
417
418 #ifdef ASSERT
419 if (FullGCALot) {
420 // Allocate an array of dummy objects.
421 // We'd like these to be at the bottom of the old generation,
422 // so that when we free one and then collect,
423 // (almost) the whole heap moves
424 // and we find out if we actually update all the oops correctly.
425 // But we can't allocate directly in the old generation,
426 // so we allocate wherever, and hope that the first collection
427 // moves these objects to the bottom of the old generation.
428 int size = FullGCALotDummies * 2;
429
430 objArrayOop naked_array = oopFactory::new_objArray(vmClasses::Object_klass(), size, CHECK);
431 objArrayHandle dummy_array(THREAD, naked_array);
432 int i = 0;
433 while (i < size) {
434 // Allocate dummy in old generation
435 oop dummy = vmClasses::Object_klass()->allocate_instance(CHECK);
436 dummy_array->obj_at_put(i++, dummy);
437 }
438 {
439 // Only modify the global variable inside the mutex.
440 // If we had a race to here, the other dummy_array instances
441 // and their elements just get dropped on the floor, which is fine.
442 MutexLocker ml(THREAD, FullGCALot_lock);
443 if (_fullgc_alot_dummy_array.is_empty()) {
444 _fullgc_alot_dummy_array = OopHandle(vm_global(), dummy_array());
445 }
446 }
447 assert(i == ((objArrayOop)_fullgc_alot_dummy_array.resolve())->length(), "just checking");
448 }
449 #endif
450 }
451
452 void Universe::initialize_basic_type_mirrors(TRAPS) {
453 #if INCLUDE_CDS_JAVA_HEAP
454 if (UseSharedSpaces &&
455 HeapShared::are_archived_mirrors_available() &&
456 _mirrors[T_INT].resolve() != NULL) {
457 assert(HeapShared::can_use(), "Sanity");
458
459 // check that all mirrors are mapped also
460 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
461 if (!is_reference_type((BasicType)i)) {
462 oop m = _mirrors[i].resolve();
463 assert(m != NULL, "archived mirrors should not be NULL");
464 }
465 }
466 } else
467 // _mirror[T_INT} could be NULL if archived heap is not mapped.
468 #endif
469 {
470 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
471 BasicType bt = (BasicType)i;
472 if (!is_reference_type(bt)) {
473 oop m = java_lang_Class::create_basic_type_mirror(type2name(bt), bt, CHECK);
474 _mirrors[i] = OopHandle(vm_global(), m);
475 }
476 }
477 }
478 }
479
480 void Universe::initialize_the_single_IdentityObject_klass_array(InstanceKlass* ik, TRAPS) {
481 assert(_the_single_IdentityObject_klass_array == NULL, "Must not be initialized twice");
482 assert(ik->name() == vmSymbols::java_lang_IdentityObject(), "Must be");
483 Array<InstanceKlass*>* array = MetadataFactory::new_array<InstanceKlass*>(ik->class_loader_data(), 1, NULL, CHECK);
484 array->at_put(0, ik);
485 _the_single_IdentityObject_klass_array = array;
486 }
487
488 void Universe::initialize_the_single_PrimitiveObject_klass_array(InstanceKlass* ik, TRAPS) {
489 assert(_the_single_PrimitiveObject_klass_array == NULL, "Must not be initialized twice");
490 assert(ik->name() == vmSymbols::java_lang_PrimitiveObject(), "Must be");
491 Array<InstanceKlass*>* array = MetadataFactory::new_array<InstanceKlass*>(ik->class_loader_data(), 1, NULL, CHECK);
492 array->at_put(0, ik);
493 _the_single_PrimitiveObject_klass_array = array;
494 }
495
496
497 void Universe::fixup_mirrors(TRAPS) {
498 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
499 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
500 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
501 // that the number of objects allocated at this point is very small.
502 assert(vmClasses::Class_klass_loaded(), "java.lang.Class should be loaded");
503 HandleMark hm(THREAD);
504
505 if (!UseSharedSpaces) {
506 // Cache the start of the static fields
507 InstanceMirrorKlass::init_offset_of_static_fields();
508 }
509
510 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
511 int list_length = list->length();
512 for (int i = 0; i < list_length; i++) {
513 Klass* k = list->at(i);
514 assert(k->is_klass(), "List should only hold classes");
515 java_lang_Class::fixup_mirror(k, CATCH);
516 }
517 delete java_lang_Class::fixup_mirror_list();
518 java_lang_Class::set_fixup_mirror_list(NULL);
519 }
520
521 #define assert_pll_locked(test) \
522 assert(Heap_lock->test(), "Reference pending list access requires lock")
523
524 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
525
526 oop Universe::reference_pending_list() {
527 if (Thread::current()->is_VM_thread()) {
528 assert_pll_locked(is_locked);
529 } else {
530 assert_pll_ownership();
531 }
532 return _reference_pending_list.resolve();
533 }
534
535 void Universe::clear_reference_pending_list() {
536 assert_pll_ownership();
537 _reference_pending_list.replace(NULL);
538 }
539
540 bool Universe::has_reference_pending_list() {
541 assert_pll_ownership();
542 return _reference_pending_list.peek() != NULL;
543 }
544
545 oop Universe::swap_reference_pending_list(oop list) {
546 assert_pll_locked(is_locked);
547 return _reference_pending_list.xchg(list);
548 }
549
550 #undef assert_pll_locked
551 #undef assert_pll_ownership
552
553 static void reinitialize_vtables() {
554 // The vtables are initialized by starting at java.lang.Object and
555 // initializing through the subclass links, so that the super
556 // classes are always initialized first.
557 for (ClassHierarchyIterator iter(vmClasses::Object_klass()); !iter.done(); iter.next()) {
558 Klass* sub = iter.klass();
559 sub->vtable().initialize_vtable();
560 }
561 }
562
563
564 static void initialize_itable_for_klass(InstanceKlass* k) {
565 k->itable().initialize_itable();
566 }
567
568
569 static void reinitialize_itables() {
570 MutexLocker mcld(ClassLoaderDataGraph_lock);
571 ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass);
572 }
573
574
575 bool Universe::on_page_boundary(void* addr) {
576 return is_aligned(addr, os::vm_page_size());
577 }
578
579 // the array of preallocated errors with backtraces
580 objArrayOop Universe::preallocated_out_of_memory_errors() {
581 return (objArrayOop)_preallocated_out_of_memory_error_array.resolve();
582 }
583
584 objArrayOop Universe::out_of_memory_errors() { return (objArrayOop)_out_of_memory_errors.resolve(); }
585
586 oop Universe::out_of_memory_error_java_heap() {
587 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_java_heap));
588 }
589
590 oop Universe::out_of_memory_error_c_heap() {
591 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_c_heap));
592 }
593
594 oop Universe::out_of_memory_error_metaspace() {
595 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_metaspace));
596 }
597
598 oop Universe::out_of_memory_error_class_metaspace() {
599 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_class_metaspace));
600 }
601
602 oop Universe::out_of_memory_error_array_size() {
603 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_array_size));
604 }
605
606 oop Universe::out_of_memory_error_gc_overhead_limit() {
607 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_gc_overhead_limit));
608 }
609
610 oop Universe::out_of_memory_error_realloc_objects() {
611 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_realloc_objects));
612 }
613
614 // Throw default _out_of_memory_error_retry object as it will never propagate out of the VM
615 oop Universe::out_of_memory_error_retry() { return out_of_memory_errors()->obj_at(_oom_retry); }
616 oop Universe::delayed_stack_overflow_error_message() { return _delayed_stack_overflow_error_message.resolve(); }
617
618
619 bool Universe::should_fill_in_stack_trace(Handle throwable) {
620 // never attempt to fill in the stack trace of preallocated errors that do not have
621 // backtrace. These errors are kept alive forever and may be "re-used" when all
622 // preallocated errors with backtrace have been consumed. Also need to avoid
623 // a potential loop which could happen if an out of memory occurs when attempting
624 // to allocate the backtrace.
625 objArrayOop preallocated_oom = out_of_memory_errors();
626 for (int i = 0; i < _oom_count; i++) {
627 if (throwable() == preallocated_oom->obj_at(i)) {
628 return false;
629 }
630 }
631 return true;
632 }
633
634
635 oop Universe::gen_out_of_memory_error(oop default_err) {
636 // generate an out of memory error:
637 // - if there is a preallocated error and stack traces are available
638 // (j.l.Throwable is initialized), then return the preallocated
639 // error with a filled in stack trace, and with the message
640 // provided by the default error.
641 // - otherwise, return the default error, without a stack trace.
642 int next;
643 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
644 vmClasses::Throwable_klass()->is_initialized()) {
645 next = (int)Atomic::add(&_preallocated_out_of_memory_error_avail_count, -1);
646 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
647 } else {
648 next = -1;
649 }
650 if (next < 0) {
651 // all preallocated errors have been used.
652 // return default
653 return default_err;
654 } else {
655 JavaThread* current = JavaThread::current();
656 Handle default_err_h(current, default_err);
657 // get the error object at the slot and set set it to NULL so that the
658 // array isn't keeping it alive anymore.
659 Handle exc(current, preallocated_out_of_memory_errors()->obj_at(next));
660 assert(exc() != NULL, "slot has been used already");
661 preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
662
663 // use the message from the default error
664 oop msg = java_lang_Throwable::message(default_err_h());
665 assert(msg != NULL, "no message");
666 java_lang_Throwable::set_message(exc(), msg);
667
668 // populate the stack trace and return it.
669 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
670 return exc();
671 }
672 }
673
674 // Setup preallocated OutOfMemoryError errors
675 void Universe::create_preallocated_out_of_memory_errors(TRAPS) {
676 InstanceKlass* ik = vmClasses::OutOfMemoryError_klass();
677 objArrayOop oa = oopFactory::new_objArray(ik, _oom_count, CHECK);
678 objArrayHandle oom_array(THREAD, oa);
679
680 for (int i = 0; i < _oom_count; i++) {
681 oop oom_obj = ik->allocate_instance(CHECK);
682 oom_array->obj_at_put(i, oom_obj);
683 }
684 _out_of_memory_errors = OopHandle(vm_global(), oom_array());
685
686 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK);
687 java_lang_Throwable::set_message(oom_array->obj_at(_oom_java_heap), msg());
688
689 msg = java_lang_String::create_from_str("C heap space", CHECK);
690 java_lang_Throwable::set_message(oom_array->obj_at(_oom_c_heap), msg());
691
692 msg = java_lang_String::create_from_str("Metaspace", CHECK);
693 java_lang_Throwable::set_message(oom_array->obj_at(_oom_metaspace), msg());
694
695 msg = java_lang_String::create_from_str("Compressed class space", CHECK);
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 GCConfig::arguments()->initialize_heap_sizes();
769
770 jint status = Universe::initialize_heap();
771 if (status != JNI_OK) {
772 return status;
773 }
774
775 Universe::initialize_tlab();
776
777 Metaspace::global_initialize();
778 // Initialize performance counters for metaspaces
779 MetaspaceCounters::initialize_performance_counters();
780
781 // Checks 'AfterMemoryInit' constraints.
782 if (!JVMFlagLimit::check_all_constraints(JVMFlagConstraintPhase::AfterMemoryInit)) {
783 return JNI_EINVAL;
784 }
785
786 // Create memory for metadata. Must be after initializing heap for
787 // DumpSharedSpaces.
788 ClassLoaderData::init_null_class_loader_data();
789
790 // We have a heap so create the Method* caches before
791 // Metaspace::initialize_shared_spaces() tries to populate them.
792 Universe::_finalizer_register_cache = new LatestMethodCache();
793 Universe::_loader_addClass_cache = new LatestMethodCache();
794 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
795 Universe::_throw_no_such_method_error_cache = new LatestMethodCache();
796 Universe::_do_stack_walk_cache = new LatestMethodCache();
797 Universe::_is_substitutable_cache = new LatestMethodCache();
798 Universe::_primitive_type_hash_code_cache = new LatestMethodCache();
799
800 #if INCLUDE_CDS
801 if (UseSharedSpaces) {
802 // Read the data structures supporting the shared spaces (shared
803 // system dictionary, symbol table, etc.). After that, access to
804 // the file (other than the mapped regions) is no longer needed, and
805 // the file is closed. Closing the file does not affect the
806 // currently mapped regions.
807 MetaspaceShared::initialize_shared_spaces();
808 StringTable::create_table();
809 if (HeapShared::is_loaded()) {
810 StringTable::transfer_shared_strings_to_local_table();
811 }
812 } else
813 #endif
814 {
815 SymbolTable::create_table();
816 StringTable::create_table();
817 }
818
819 #if INCLUDE_CDS
820 if (Arguments::is_dumping_archive()) {
821 MetaspaceShared::prepare_for_dumping();
822 }
823 #endif
824
825 if (strlen(VerifySubSet) > 0) {
826 Universe::initialize_verify_flags();
827 }
828
829 ResolvedMethodTable::create_table();
830
831 return JNI_OK;
832 }
833
834 jint Universe::initialize_heap() {
835 assert(_collectedHeap == NULL, "Heap already created");
836 _collectedHeap = GCConfig::arguments()->create_heap();
837
838 log_info(gc)("Using %s", _collectedHeap->name());
839 return _collectedHeap->initialize();
840 }
841
842 void Universe::initialize_tlab() {
843 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
844 if (UseTLAB) {
845 ThreadLocalAllocBuffer::startup_initialization();
846 }
847 }
848
849 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
850
851 assert(alignment <= Arguments::conservative_max_heap_alignment(),
852 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
853 alignment, Arguments::conservative_max_heap_alignment());
854
855 size_t total_reserved = align_up(heap_size, alignment);
856 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
857 "heap size is too big for compressed oops");
858
859 size_t page_size = os::vm_page_size();
860 if (UseLargePages && is_aligned(alignment, os::large_page_size())) {
861 page_size = os::large_page_size();
862 } else {
863 // Parallel is the only collector that might opt out of using large pages
864 // for the heap.
865 assert(!UseLargePages || UseParallelGC , "Wrong alignment to use large pages");
866 }
867
868 // Now create the space.
869 ReservedHeapSpace total_rs(total_reserved, alignment, page_size, AllocateHeapAt);
870
871 if (total_rs.is_reserved()) {
872 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
873 "must be exactly of required size and alignment");
874 // We are good.
875
876 if (AllocateHeapAt != NULL) {
877 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
878 }
879
880 if (UseCompressedOops) {
881 CompressedOops::initialize(total_rs);
882 }
883
884 Universe::calculate_verify_data((HeapWord*)total_rs.base(), (HeapWord*)total_rs.end());
885
886 return total_rs;
887 }
888
889 vm_exit_during_initialization(
890 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
891 total_reserved/K));
892
893 // satisfy compiler
894 ShouldNotReachHere();
895 return ReservedHeapSpace(0, 0, os::vm_page_size());
896 }
897
898 OopStorage* Universe::vm_weak() {
899 return Universe::_vm_weak;
900 }
901
902 OopStorage* Universe::vm_global() {
903 return Universe::_vm_global;
904 }
905
906 void Universe::oopstorage_init() {
907 Universe::_vm_global = OopStorageSet::create_strong("VM Global", mtInternal);
908 Universe::_vm_weak = OopStorageSet::create_weak("VM Weak", mtInternal);
909 }
910
911 void universe_oopstorage_init() {
912 Universe::oopstorage_init();
913 }
914
915 void initialize_known_method(LatestMethodCache* method_cache,
916 InstanceKlass* ik,
917 const char* method,
918 Symbol* signature,
919 bool is_static, TRAPS)
920 {
921 TempNewSymbol name = SymbolTable::new_symbol(method);
922 Method* m = NULL;
923 // The klass must be linked before looking up the method.
924 if (!ik->link_class_or_fail(THREAD) ||
925 ((m = ik->find_method(name, signature)) == NULL) ||
926 is_static != m->is_static()) {
927 ResourceMark rm(THREAD);
928 // NoSuchMethodException doesn't actually work because it tries to run the
929 // <init> function before java_lang_Class is linked. Print error and exit.
930 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
931 ik->name()->as_C_string(), method));
932 }
933 method_cache->init(ik, m);
934 }
935
936 void Universe::initialize_known_methods(TRAPS) {
937 // Set up static method for registering finalizers
938 initialize_known_method(_finalizer_register_cache,
939 vmClasses::Finalizer_klass(),
940 "register",
941 vmSymbols::object_void_signature(), true, CHECK);
942
943 initialize_known_method(_throw_illegal_access_error_cache,
944 vmClasses::internal_Unsafe_klass(),
945 "throwIllegalAccessError",
946 vmSymbols::void_method_signature(), true, CHECK);
947
948 initialize_known_method(_throw_no_such_method_error_cache,
949 vmClasses::internal_Unsafe_klass(),
950 "throwNoSuchMethodError",
951 vmSymbols::void_method_signature(), true, CHECK);
952
953 // Set up method for registering loaded classes in class loader vector
954 initialize_known_method(_loader_addClass_cache,
955 vmClasses::ClassLoader_klass(),
956 "addClass",
957 vmSymbols::class_void_signature(), false, CHECK);
958
959 // Set up method for stack walking
960 initialize_known_method(_do_stack_walk_cache,
961 vmClasses::AbstractStackWalker_klass(),
962 "doStackWalk",
963 vmSymbols::doStackWalk_signature(), false, CHECK);
964
965 // Set up substitutability testing
966 ResourceMark rm;
967 initialize_known_method(_is_substitutable_cache,
968 vmClasses::PrimitiveObjectMethods_klass(),
969 vmSymbols::isSubstitutable_name()->as_C_string(),
970 vmSymbols::object_object_boolean_signature(), true, CHECK);
971 initialize_known_method(_primitive_type_hash_code_cache,
972 vmClasses::PrimitiveObjectMethods_klass(),
973 vmSymbols::primitiveObjectHashCode_name()->as_C_string(),
974 vmSymbols::object_int_signature(), true, CHECK);
975 }
976
977 void universe2_init() {
978 EXCEPTION_MARK;
979 Universe::genesis(CATCH);
980 }
981
982 // Set after initialization of the module runtime, call_initModuleRuntime
983 void universe_post_module_init() {
984 Universe::_module_initialized = true;
985 }
986
987 bool universe_post_init() {
988 assert(!is_init_completed(), "Error: initialization not yet completed!");
989 Universe::_fully_initialized = true;
990 EXCEPTION_MARK;
991 if (!UseSharedSpaces) {
992 reinitialize_vtables();
993 reinitialize_itables();
994 }
995
996 HandleMark hm(THREAD);
997 // Setup preallocated empty java.lang.Class array for Method reflection.
998
999 objArrayOop the_empty_class_array = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_false);
1000 Universe::_the_empty_class_array = OopHandle(Universe::vm_global(), the_empty_class_array);
1001
1002 // Setup preallocated OutOfMemoryError errors
1003 Universe::create_preallocated_out_of_memory_errors(CHECK_false);
1004
1005 oop instance;
1006 // Setup preallocated cause message for delayed StackOverflowError
1007 if (StackReservedPages > 0) {
1008 instance = java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
1009 Universe::_delayed_stack_overflow_error_message = OopHandle(Universe::vm_global(), instance);
1010 }
1011
1012 // Setup preallocated NullPointerException
1013 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1014 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
1015 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1016 Universe::_null_ptr_exception_instance = OopHandle(Universe::vm_global(), instance);
1017
1018 // Setup preallocated ArithmeticException
1019 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1020 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
1021 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1022 Universe::_arithmetic_exception_instance = OopHandle(Universe::vm_global(), instance);
1023
1024 // Virtual Machine Error for when we get into a situation we can't resolve
1025 k = vmClasses::VirtualMachineError_klass();
1026 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1027 if (!linked) {
1028 tty->print_cr("Unable to link/verify VirtualMachineError class");
1029 return false; // initialization failed
1030 }
1031 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1032 Universe::_virtual_machine_error_instance = OopHandle(Universe::vm_global(), instance);
1033
1034 Handle msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1035 java_lang_Throwable::set_message(Universe::arithmetic_exception_instance(), msg());
1036
1037 Universe::initialize_known_methods(CHECK_false);
1038
1039 // This needs to be done before the first scavenge/gc, since
1040 // it's an input to soft ref clearing policy.
1041 {
1042 MutexLocker x(THREAD, Heap_lock);
1043 Universe::heap()->update_capacity_and_used_at_gc();
1044 }
1045
1046 // ("weak") refs processing infrastructure initialization
1047 Universe::heap()->post_initialize();
1048
1049 MemoryService::add_metaspace_memory_pools();
1050
1051 MemoryService::set_universe_heap(Universe::heap());
1052 #if INCLUDE_CDS
1053 MetaspaceShared::post_initialize(CHECK_false);
1054 #endif
1055 return true;
1056 }
1057
1058
1059 void Universe::compute_base_vtable_size() {
1060 _base_vtable_size = ClassLoader::compute_Object_vtable();
1061 }
1062
1063 void Universe::print_on(outputStream* st) {
1064 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1065 st->print_cr("Heap");
1066 heap()->print_on(st);
1067 }
1068
1069 void Universe::print_heap_at_SIGBREAK() {
1070 if (PrintHeapAtSIGBREAK) {
1071 print_on(tty);
1072 tty->cr();
1073 tty->flush();
1074 }
1075 }
1076
1077 void Universe::initialize_verify_flags() {
1078 verify_flags = 0;
1079 const char delimiter[] = " ,";
1080
1081 size_t length = strlen(VerifySubSet);
1082 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1083 strncpy(subset_list, VerifySubSet, length + 1);
1084 char* save_ptr;
1085
1086 char* token = strtok_r(subset_list, delimiter, &save_ptr);
1087 while (token != NULL) {
1088 if (strcmp(token, "threads") == 0) {
1089 verify_flags |= Verify_Threads;
1090 } else if (strcmp(token, "heap") == 0) {
1091 verify_flags |= Verify_Heap;
1092 } else if (strcmp(token, "symbol_table") == 0) {
1093 verify_flags |= Verify_SymbolTable;
1094 } else if (strcmp(token, "string_table") == 0) {
1095 verify_flags |= Verify_StringTable;
1096 } else if (strcmp(token, "codecache") == 0) {
1097 verify_flags |= Verify_CodeCache;
1098 } else if (strcmp(token, "dictionary") == 0) {
1099 verify_flags |= Verify_SystemDictionary;
1100 } else if (strcmp(token, "classloader_data_graph") == 0) {
1101 verify_flags |= Verify_ClassLoaderDataGraph;
1102 } else if (strcmp(token, "metaspace") == 0) {
1103 verify_flags |= Verify_MetaspaceUtils;
1104 } else if (strcmp(token, "jni_handles") == 0) {
1105 verify_flags |= Verify_JNIHandles;
1106 } else if (strcmp(token, "codecache_oops") == 0) {
1107 verify_flags |= Verify_CodeCacheOops;
1108 } else if (strcmp(token, "resolved_method_table") == 0) {
1109 verify_flags |= Verify_ResolvedMethodTable;
1110 } else if (strcmp(token, "stringdedup") == 0) {
1111 verify_flags |= Verify_StringDedup;
1112 } else {
1113 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1114 }
1115 token = strtok_r(NULL, delimiter, &save_ptr);
1116 }
1117 FREE_C_HEAP_ARRAY(char, subset_list);
1118 }
1119
1120 bool Universe::should_verify_subset(uint subset) {
1121 if (verify_flags & subset) {
1122 return true;
1123 }
1124 return false;
1125 }
1126
1127 void Universe::verify(VerifyOption option, const char* prefix) {
1128 COMPILER2_PRESENT(
1129 assert(!DerivedPointerTable::is_active(),
1130 "DPT should not be active during verification "
1131 "(of thread stacks below)");
1132 )
1133
1134 Thread* thread = Thread::current();
1135 ResourceMark rm(thread);
1136 HandleMark hm(thread); // Handles created during verification can be zapped
1137 _verify_count++;
1138
1139 FormatBuffer<> title("Verifying %s", prefix);
1140 GCTraceTime(Info, gc, verify) tm(title.buffer());
1141 if (should_verify_subset(Verify_Threads)) {
1142 log_debug(gc, verify)("Threads");
1143 Threads::verify();
1144 }
1145 if (should_verify_subset(Verify_Heap)) {
1146 log_debug(gc, verify)("Heap");
1147 heap()->verify(option);
1148 }
1149 if (should_verify_subset(Verify_SymbolTable)) {
1150 log_debug(gc, verify)("SymbolTable");
1151 SymbolTable::verify();
1152 }
1153 if (should_verify_subset(Verify_StringTable)) {
1154 log_debug(gc, verify)("StringTable");
1155 StringTable::verify();
1156 }
1157 if (should_verify_subset(Verify_CodeCache)) {
1158 log_debug(gc, verify)("CodeCache");
1159 CodeCache::verify();
1160 }
1161 if (should_verify_subset(Verify_SystemDictionary)) {
1162 log_debug(gc, verify)("SystemDictionary");
1163 SystemDictionary::verify();
1164 }
1165 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1166 log_debug(gc, verify)("ClassLoaderDataGraph");
1167 ClassLoaderDataGraph::verify();
1168 }
1169 if (should_verify_subset(Verify_MetaspaceUtils)) {
1170 log_debug(gc, verify)("MetaspaceUtils");
1171 DEBUG_ONLY(MetaspaceUtils::verify();)
1172 }
1173 if (should_verify_subset(Verify_JNIHandles)) {
1174 log_debug(gc, verify)("JNIHandles");
1175 JNIHandles::verify();
1176 }
1177 if (should_verify_subset(Verify_CodeCacheOops)) {
1178 log_debug(gc, verify)("CodeCache Oops");
1179 CodeCache::verify_oops();
1180 }
1181 if (should_verify_subset(Verify_ResolvedMethodTable)) {
1182 log_debug(gc, verify)("ResolvedMethodTable Oops");
1183 ResolvedMethodTable::verify();
1184 }
1185 if (should_verify_subset(Verify_StringDedup)) {
1186 log_debug(gc, verify)("String Deduplication");
1187 StringDedup::verify();
1188 }
1189 }
1190
1191
1192 #ifndef PRODUCT
1193 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1194 assert(low_boundary < high_boundary, "bad interval");
1195
1196 // decide which low-order bits we require to be clear:
1197 size_t alignSize = MinObjAlignmentInBytes;
1198 size_t min_object_size = CollectedHeap::min_fill_size();
1199
1200 // make an inclusive limit:
1201 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1202 uintptr_t min = (uintptr_t)low_boundary;
1203 assert(min < max, "bad interval");
1204 uintptr_t diff = max ^ min;
1205
1206 // throw away enough low-order bits to make the diff vanish
1207 uintptr_t mask = (uintptr_t)(-1);
1208 while ((mask & diff) != 0)
1209 mask <<= 1;
1210 uintptr_t bits = (min & mask);
1211 assert(bits == (max & mask), "correct mask");
1212 // check an intermediate value between min and max, just to make sure:
1213 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1214
1215 // require address alignment, too:
1216 mask |= (alignSize - 1);
1217
1218 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1219 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1220 }
1221 _verify_oop_mask = mask;
1222 _verify_oop_bits = bits;
1223 }
1224
1225 // Oop verification (see MacroAssembler::verify_oop)
1226
1227 uintptr_t Universe::verify_oop_mask() {
1228 return _verify_oop_mask;
1229 }
1230
1231 uintptr_t Universe::verify_oop_bits() {
1232 return _verify_oop_bits;
1233 }
1234
1235 uintptr_t Universe::verify_mark_mask() {
1236 return markWord::lock_mask_in_place;
1237 }
1238
1239 uintptr_t Universe::verify_mark_bits() {
1240 intptr_t mask = verify_mark_mask();
1241 intptr_t bits = (intptr_t)markWord::prototype().value();
1242 assert((bits & ~mask) == 0, "no stray header bits");
1243 return bits;
1244 }
1245 #endif // PRODUCT
1246
1247
1248 void LatestMethodCache::init(Klass* k, Method* m) {
1249 if (!UseSharedSpaces) {
1250 _klass = k;
1251 }
1252 #ifndef PRODUCT
1253 else {
1254 // sharing initilization should have already set up _klass
1255 assert(_klass != NULL, "just checking");
1256 }
1257 #endif
1258
1259 _method_idnum = m->method_idnum();
1260 assert(_method_idnum >= 0, "sanity check");
1261 }
1262
1263
1264 Method* LatestMethodCache::get_method() {
1265 if (klass() == NULL) return NULL;
1266 InstanceKlass* ik = InstanceKlass::cast(klass());
1267 Method* m = ik->method_with_idnum(method_idnum());
1268 assert(m != NULL, "sanity check");
1269 return m;
1270 }
1271
1272 #ifdef ASSERT
1273 // Release dummy object(s) at bottom of heap
1274 bool Universe::release_fullgc_alot_dummy() {
1275 MutexLocker ml(FullGCALot_lock);
1276 objArrayOop fullgc_alot_dummy_array = (objArrayOop)_fullgc_alot_dummy_array.resolve();
1277 if (fullgc_alot_dummy_array != NULL) {
1278 if (_fullgc_alot_dummy_next >= fullgc_alot_dummy_array->length()) {
1279 // No more dummies to release, release entire array instead
1280 _fullgc_alot_dummy_array.release(Universe::vm_global());
1281 return false;
1282 }
1283
1284 // Release dummy at bottom of old generation
1285 fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1286 }
1287 return true;
1288 }
1289
1290 bool Universe::is_gc_active() {
1291 return heap()->is_gc_active();
1292 }
1293
1294 bool Universe::is_in_heap(const void* p) {
1295 return heap()->is_in(p);
1296 }
1297
1298 #endif // ASSERT