1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "aot/aotLoader.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/classLoaderData.hpp"
29 #include "classfile/javaClasses.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/vmSymbols.hpp"
33 #include "code/codeCache.hpp"
34 #include "code/dependencies.hpp"
35 #include "gc/shared/cardTableModRefBS.hpp"
36 #include "gc/shared/collectedHeap.inline.hpp"
37 #include "gc/shared/gcArguments.hpp"
38 #include "gc/shared/gcLocker.inline.hpp"
39 #include "gc/shared/generation.hpp"
40 #include "gc/shared/gcTraceTime.inline.hpp"
41 #include "gc/shared/space.hpp"
42 #include "interpreter/interpreter.hpp"
43 #include "logging/log.hpp"
44 #include "logging/logStream.hpp"
45 #include "memory/filemap.hpp"
46 #include "memory/metadataFactory.hpp"
47 #include "memory/metaspaceClosure.hpp"
48 #include "memory/metaspaceShared.hpp"
49 #include "memory/oopFactory.hpp"
50 #include "memory/resourceArea.hpp"
51 #include "memory/universe.hpp"
52 #include "memory/universe.inline.hpp"
53 #include "oops/constantPool.hpp"
54 #include "oops/instanceClassLoaderKlass.hpp"
55 #include "oops/instanceKlass.hpp"
56 #include "oops/instanceMirrorKlass.hpp"
57 #include "oops/instanceRefKlass.hpp"
58 #include "oops/objArrayOop.inline.hpp"
59 #include "oops/oop.inline.hpp"
60 #include "oops/typeArrayKlass.hpp"
61 #include "prims/resolvedMethodTable.hpp"
62 #include "runtime/arguments.hpp"
63 #include "runtime/atomic.hpp"
64 #include "runtime/commandLineFlagConstraintList.hpp"
65 #include "runtime/deoptimization.hpp"
66 #include "runtime/handles.inline.hpp"
67 #include "runtime/init.hpp"
68 #include "runtime/java.hpp"
69 #include "runtime/javaCalls.hpp"
70 #include "runtime/sharedRuntime.hpp"
71 #include "runtime/synchronizer.hpp"
72 #include "runtime/thread.inline.hpp"
73 #include "runtime/timerTrace.hpp"
74 #include "runtime/vm_operations.hpp"
75 #include "services/memoryService.hpp"
76 #include "utilities/align.hpp"
77 #include "utilities/copy.hpp"
78 #include "utilities/debug.hpp"
79 #include "utilities/events.hpp"
80 #include "utilities/formatBuffer.hpp"
81 #include "utilities/hashtable.inline.hpp"
82 #include "utilities/macros.hpp"
83 #include "utilities/ostream.hpp"
84 #include "utilities/preserveException.hpp"
85 #if INCLUDE_CDS
86 #include "classfile/sharedClassUtil.hpp"
87 #endif
88
89 // Known objects
90 Klass* Universe::_boolArrayKlassObj = NULL;
91 Klass* Universe::_byteArrayKlassObj = NULL;
92 Klass* Universe::_charArrayKlassObj = NULL;
93 Klass* Universe::_intArrayKlassObj = NULL;
94 Klass* Universe::_shortArrayKlassObj = NULL;
95 Klass* Universe::_longArrayKlassObj = NULL;
96 Klass* Universe::_singleArrayKlassObj = NULL;
97 Klass* Universe::_doubleArrayKlassObj = NULL;
98 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ };
99 Klass* Universe::_objectArrayKlassObj = NULL;
100 oop Universe::_int_mirror = NULL;
101 oop Universe::_float_mirror = NULL;
102 oop Universe::_double_mirror = NULL;
103 oop Universe::_byte_mirror = NULL;
104 oop Universe::_bool_mirror = NULL;
105 oop Universe::_char_mirror = NULL;
106 oop Universe::_long_mirror = NULL;
107 oop Universe::_short_mirror = NULL;
108 oop Universe::_void_mirror = NULL;
109 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ };
110 oop Universe::_main_thread_group = NULL;
111 oop Universe::_system_thread_group = NULL;
112 objArrayOop Universe::_the_empty_class_klass_array = NULL;
113 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
114 oop Universe::_the_null_sentinel = NULL;
115 oop Universe::_the_null_string = NULL;
116 oop Universe::_the_min_jint_string = NULL;
117 LatestMethodCache* Universe::_finalizer_register_cache = NULL;
118 LatestMethodCache* Universe::_loader_addClass_cache = NULL;
119 LatestMethodCache* Universe::_pd_implies_cache = NULL;
120 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL;
121 LatestMethodCache* Universe::_do_stack_walk_cache = NULL;
122 oop Universe::_out_of_memory_error_java_heap = NULL;
123 oop Universe::_out_of_memory_error_metaspace = NULL;
124 oop Universe::_out_of_memory_error_class_metaspace = NULL;
125 oop Universe::_out_of_memory_error_array_size = NULL;
126 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL;
127 oop Universe::_out_of_memory_error_realloc_objects = NULL;
128 oop Universe::_delayed_stack_overflow_error_message = NULL;
129 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL;
130 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
131 bool Universe::_verify_in_progress = false;
132 long Universe::verify_flags = Universe::Verify_All;
133 oop Universe::_null_ptr_exception_instance = NULL;
134 oop Universe::_arithmetic_exception_instance = NULL;
135 oop Universe::_virtual_machine_error_instance = NULL;
136 oop Universe::_vm_exception = NULL;
137 oop Universe::_reference_pending_list = NULL;
138
139 Array<int>* Universe::_the_empty_int_array = NULL;
140 Array<u2>* Universe::_the_empty_short_array = NULL;
141 Array<Klass*>* Universe::_the_empty_klass_array = NULL;
142 Array<Method*>* Universe::_the_empty_method_array = NULL;
143
144 // These variables are guarded by FullGCALot_lock.
145 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;)
146 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
147
148 // Heap
149 int Universe::_verify_count = 0;
150
151 // Oop verification (see MacroAssembler::verify_oop)
152 uintptr_t Universe::_verify_oop_mask = 0;
153 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
154
155 int Universe::_base_vtable_size = 0;
156 bool Universe::_bootstrapping = false;
157 bool Universe::_module_initialized = false;
158 bool Universe::_fully_initialized = false;
159
160 size_t Universe::_heap_capacity_at_last_gc;
161 size_t Universe::_heap_used_at_last_gc = 0;
162
163 CollectedHeap* Universe::_collectedHeap = NULL;
164
165 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true };
166 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true };
167 address Universe::_narrow_ptrs_base;
168
169 void Universe::basic_type_classes_do(void f(Klass*)) {
170 f(boolArrayKlassObj());
171 f(byteArrayKlassObj());
172 f(charArrayKlassObj());
173 f(intArrayKlassObj());
174 f(shortArrayKlassObj());
175 f(longArrayKlassObj());
176 f(singleArrayKlassObj());
177 f(doubleArrayKlassObj());
178 }
179
180 void Universe::oops_do(OopClosure* f, bool do_all) {
181
182 f->do_oop((oop*) &_int_mirror);
183 f->do_oop((oop*) &_float_mirror);
184 f->do_oop((oop*) &_double_mirror);
185 f->do_oop((oop*) &_byte_mirror);
186 f->do_oop((oop*) &_bool_mirror);
187 f->do_oop((oop*) &_char_mirror);
188 f->do_oop((oop*) &_long_mirror);
189 f->do_oop((oop*) &_short_mirror);
190 f->do_oop((oop*) &_void_mirror);
191
192 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
193 f->do_oop((oop*) &_mirrors[i]);
194 }
195 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
196
197 f->do_oop((oop*)&_the_empty_class_klass_array);
198 f->do_oop((oop*)&_the_null_sentinel);
199 f->do_oop((oop*)&_the_null_string);
200 f->do_oop((oop*)&_the_min_jint_string);
201 f->do_oop((oop*)&_out_of_memory_error_java_heap);
202 f->do_oop((oop*)&_out_of_memory_error_metaspace);
203 f->do_oop((oop*)&_out_of_memory_error_class_metaspace);
204 f->do_oop((oop*)&_out_of_memory_error_array_size);
205 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit);
206 f->do_oop((oop*)&_out_of_memory_error_realloc_objects);
207 f->do_oop((oop*)&_delayed_stack_overflow_error_message);
208 f->do_oop((oop*)&_preallocated_out_of_memory_error_array);
209 f->do_oop((oop*)&_null_ptr_exception_instance);
210 f->do_oop((oop*)&_arithmetic_exception_instance);
211 f->do_oop((oop*)&_virtual_machine_error_instance);
212 f->do_oop((oop*)&_main_thread_group);
213 f->do_oop((oop*)&_system_thread_group);
214 f->do_oop((oop*)&_vm_exception);
215 f->do_oop((oop*)&_reference_pending_list);
216 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);)
217 }
218
219 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
220 it->push(&_klass);
221 }
222
223 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
224 it->push(&_boolArrayKlassObj);
225 it->push(&_byteArrayKlassObj);
226 it->push(&_charArrayKlassObj);
227 it->push(&_intArrayKlassObj);
228 it->push(&_shortArrayKlassObj);
229 it->push(&_longArrayKlassObj);
230 it->push(&_singleArrayKlassObj);
231 it->push(&_doubleArrayKlassObj);
232 for (int i = 0; i < T_VOID+1; i++) {
233 it->push(&_typeArrayKlassObjs[i]);
234 }
235 it->push(&_objectArrayKlassObj);
236
237 it->push(&_the_empty_int_array);
238 it->push(&_the_empty_short_array);
239 it->push(&_the_empty_klass_array);
240 it->push(&_the_empty_method_array);
241 it->push(&_the_array_interfaces_array);
242
243 _finalizer_register_cache->metaspace_pointers_do(it);
244 _loader_addClass_cache->metaspace_pointers_do(it);
245 _pd_implies_cache->metaspace_pointers_do(it);
246 _throw_illegal_access_error_cache->metaspace_pointers_do(it);
247 _do_stack_walk_cache->metaspace_pointers_do(it);
248 }
249
250 // Serialize metadata in and out of CDS archive, not oops.
251 void Universe::serialize(SerializeClosure* f, bool do_all) {
252
253 f->do_ptr((void**)&_boolArrayKlassObj);
254 f->do_ptr((void**)&_byteArrayKlassObj);
255 f->do_ptr((void**)&_charArrayKlassObj);
256 f->do_ptr((void**)&_intArrayKlassObj);
257 f->do_ptr((void**)&_shortArrayKlassObj);
258 f->do_ptr((void**)&_longArrayKlassObj);
259 f->do_ptr((void**)&_singleArrayKlassObj);
260 f->do_ptr((void**)&_doubleArrayKlassObj);
261 f->do_ptr((void**)&_objectArrayKlassObj);
262
263 {
264 for (int i = 0; i < T_VOID+1; i++) {
265 if (_typeArrayKlassObjs[i] != NULL) {
266 assert(i >= T_BOOLEAN, "checking");
267 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
268 } else if (do_all) {
269 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
270 }
271 }
272 }
273
274 f->do_ptr((void**)&_the_array_interfaces_array);
275 f->do_ptr((void**)&_the_empty_int_array);
276 f->do_ptr((void**)&_the_empty_short_array);
277 f->do_ptr((void**)&_the_empty_method_array);
278 f->do_ptr((void**)&_the_empty_klass_array);
279 _finalizer_register_cache->serialize(f);
280 _loader_addClass_cache->serialize(f);
281 _pd_implies_cache->serialize(f);
282 _throw_illegal_access_error_cache->serialize(f);
283 _do_stack_walk_cache->serialize(f);
284 }
285
286 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
287 if (size < alignment || size % alignment != 0) {
288 vm_exit_during_initialization(
289 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
290 }
291 }
292
293 void initialize_basic_type_klass(Klass* k, TRAPS) {
294 Klass* ok = SystemDictionary::Object_klass();
295 #if INCLUDE_CDS
296 if (UseSharedSpaces) {
297 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
298 assert(k->super() == ok, "u3");
299 k->restore_unshareable_info(loader_data, Handle(), CHECK);
300 } else
301 #endif
302 {
303 k->initialize_supers(ok, CHECK);
304 }
305 k->append_to_sibling_list();
306 }
307
308 void Universe::genesis(TRAPS) {
309 ResourceMark rm;
310
311 { FlagSetting fs(_bootstrapping, true);
312
313 { MutexLocker mc(Compile_lock);
314
315 java_lang_Class::allocate_fixup_lists();
316
317 // determine base vtable size; without that we cannot create the array klasses
318 compute_base_vtable_size();
319
320 if (!UseSharedSpaces) {
321 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK);
322 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK);
323 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK);
324 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK);
325 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK);
326 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK);
327 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK);
328 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK);
329
330 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj;
331 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj;
332 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj;
333 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj;
334 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj;
335 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj;
336 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj;
337 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj;
338
339 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
340
341 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
342 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
343 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
344 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
345 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
346 }
347 }
348
349 vmSymbols::initialize(CHECK);
350
351 SystemDictionary::initialize(CHECK);
352
353 Klass* ok = SystemDictionary::Object_klass();
354
355 _the_null_string = StringTable::intern("null", CHECK);
356 _the_min_jint_string = StringTable::intern("-2147483648", CHECK);
357
358 #if INCLUDE_CDS
359 if (UseSharedSpaces) {
360 // Verify shared interfaces array.
361 assert(_the_array_interfaces_array->at(0) ==
362 SystemDictionary::Cloneable_klass(), "u3");
363 assert(_the_array_interfaces_array->at(1) ==
364 SystemDictionary::Serializable_klass(), "u3");
365 MetaspaceShared::fixup_mapped_heap_regions();
366 } else
367 #endif
368 {
369 // Set up shared interfaces array. (Do this before supers are set up.)
370 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
371 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
372 }
373
374 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
375 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
376 initialize_basic_type_klass(singleArrayKlassObj(), CHECK);
377 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
378 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
379 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
380 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
381 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
382 } // end of core bootstrapping
383
384 {
385 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
386 _the_null_sentinel = tns();
387 }
388
389 // Maybe this could be lifted up now that object array can be initialized
390 // during the bootstrapping.
391
392 // OLD
393 // Initialize _objectArrayKlass after core bootstraping to make
394 // sure the super class is set up properly for _objectArrayKlass.
395 // ---
396 // NEW
397 // Since some of the old system object arrays have been converted to
398 // ordinary object arrays, _objectArrayKlass will be loaded when
399 // SystemDictionary::initialize(CHECK); is run. See the extra check
400 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
401 _objectArrayKlassObj = InstanceKlass::
402 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
403 // OLD
404 // Add the class to the class hierarchy manually to make sure that
405 // its vtable is initialized after core bootstrapping is completed.
406 // ---
407 // New
408 // Have already been initialized.
409 _objectArrayKlassObj->append_to_sibling_list();
410
411 #ifdef ASSERT
412 if (FullGCALot) {
413 // Allocate an array of dummy objects.
414 // We'd like these to be at the bottom of the old generation,
415 // so that when we free one and then collect,
416 // (almost) the whole heap moves
417 // and we find out if we actually update all the oops correctly.
418 // But we can't allocate directly in the old generation,
419 // so we allocate wherever, and hope that the first collection
420 // moves these objects to the bottom of the old generation.
421 // We can allocate directly in the permanent generation, so we do.
422 int size;
423 if (UseConcMarkSweepGC) {
424 log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate");
425 size = FullGCALotDummies;
426 } else {
427 size = FullGCALotDummies * 2;
428 }
429 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
430 objArrayHandle dummy_array(THREAD, naked_array);
431 int i = 0;
432 while (i < size) {
433 // Allocate dummy in old generation
434 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK);
435 dummy_array->obj_at_put(i++, dummy);
436 }
437 {
438 // Only modify the global variable inside the mutex.
439 // If we had a race to here, the other dummy_array instances
440 // and their elements just get dropped on the floor, which is fine.
441 MutexLocker ml(FullGCALot_lock);
442 if (_fullgc_alot_dummy_array == NULL) {
443 _fullgc_alot_dummy_array = dummy_array();
444 }
445 }
446 assert(i == _fullgc_alot_dummy_array->length(), "just checking");
447 }
448 #endif
449 }
450
451 void Universe::initialize_basic_type_mirrors(TRAPS) {
452 assert(_int_mirror==NULL, "basic type mirrors already initialized");
453 _int_mirror =
454 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK);
455 _float_mirror =
456 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK);
457 _double_mirror =
458 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK);
459 _byte_mirror =
460 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK);
461 _bool_mirror =
462 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
463 _char_mirror =
464 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK);
465 _long_mirror =
466 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK);
467 _short_mirror =
468 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK);
469 _void_mirror =
470 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK);
471
472 _mirrors[T_INT] = _int_mirror;
473 _mirrors[T_FLOAT] = _float_mirror;
474 _mirrors[T_DOUBLE] = _double_mirror;
475 _mirrors[T_BYTE] = _byte_mirror;
476 _mirrors[T_BOOLEAN] = _bool_mirror;
477 _mirrors[T_CHAR] = _char_mirror;
478 _mirrors[T_LONG] = _long_mirror;
479 _mirrors[T_SHORT] = _short_mirror;
480 _mirrors[T_VOID] = _void_mirror;
481 //_mirrors[T_OBJECT] = _object_klass->java_mirror();
482 //_mirrors[T_ARRAY] = _object_klass->java_mirror();
483 }
484
485 void Universe::fixup_mirrors(TRAPS) {
486 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
487 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
488 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
489 // that the number of objects allocated at this point is very small.
490 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
491 HandleMark hm(THREAD);
492 // Cache the start of the static fields
493 InstanceMirrorKlass::init_offset_of_static_fields();
494
495 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
496 int list_length = list->length();
497 for (int i = 0; i < list_length; i++) {
498 Klass* k = list->at(i);
499 assert(k->is_klass(), "List should only hold classes");
500 EXCEPTION_MARK;
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;
519 }
520
521 void Universe::set_reference_pending_list(oop list) {
522 assert_pll_ownership();
523 _reference_pending_list = list;
524 }
525
526 bool Universe::has_reference_pending_list() {
527 assert_pll_ownership();
528 return _reference_pending_list != NULL;
529 }
530
531 oop Universe::swap_reference_pending_list(oop list) {
532 assert_pll_locked(is_locked);
533 return Atomic::xchg(list, &_reference_pending_list);
534 }
535
536 #undef assert_pll_locked
537 #undef assert_pll_ownership
538
539 // initialize_vtable could cause gc if
540 // 1) we specified true to initialize_vtable and
541 // 2) this ran after gc was enabled
542 // In case those ever change we use handles for oops
543 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) {
544 // init vtable of k and all subclasses
545 ko->vtable().initialize_vtable(false, CHECK);
546 if (ko->is_instance_klass()) {
547 for (Klass* sk = ko->subklass();
548 sk != NULL;
549 sk = sk->next_sibling()) {
550 reinitialize_vtable_of(sk, CHECK);
551 }
552 }
553 }
554
555
556 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) {
557 k->itable().initialize_itable(false, CHECK);
558 }
559
560
561 void Universe::reinitialize_itables(TRAPS) {
562 ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK);
563 }
564
565
566 bool Universe::on_page_boundary(void* addr) {
567 return is_aligned(addr, os::vm_page_size());
568 }
569
570
571 bool Universe::should_fill_in_stack_trace(Handle throwable) {
572 // never attempt to fill in the stack trace of preallocated errors that do not have
573 // backtrace. These errors are kept alive forever and may be "re-used" when all
574 // preallocated errors with backtrace have been consumed. Also need to avoid
575 // a potential loop which could happen if an out of memory occurs when attempting
576 // to allocate the backtrace.
577 return ((throwable() != Universe::_out_of_memory_error_java_heap) &&
578 (throwable() != Universe::_out_of_memory_error_metaspace) &&
579 (throwable() != Universe::_out_of_memory_error_class_metaspace) &&
580 (throwable() != Universe::_out_of_memory_error_array_size) &&
581 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) &&
582 (throwable() != Universe::_out_of_memory_error_realloc_objects));
583 }
584
585
586 oop Universe::gen_out_of_memory_error(oop default_err) {
587 // generate an out of memory error:
588 // - if there is a preallocated error and stack traces are available
589 // (j.l.Throwable is initialized), then return the preallocated
590 // error with a filled in stack trace, and with the message
591 // provided by the default error.
592 // - otherwise, return the default error, without a stack trace.
593 int next;
594 if ((_preallocated_out_of_memory_error_avail_count > 0) &&
595 SystemDictionary::Throwable_klass()->is_initialized()) {
596 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);
597 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
598 } else {
599 next = -1;
600 }
601 if (next < 0) {
602 // all preallocated errors have been used.
603 // return default
604 return default_err;
605 } else {
606 Thread* THREAD = Thread::current();
607 Handle default_err_h(THREAD, default_err);
608 // get the error object at the slot and set set it to NULL so that the
609 // array isn't keeping it alive anymore.
610 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next));
611 assert(exc() != NULL, "slot has been used already");
612 preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
613
614 // use the message from the default error
615 oop msg = java_lang_Throwable::message(default_err_h());
616 assert(msg != NULL, "no message");
617 java_lang_Throwable::set_message(exc(), msg);
618
619 // populate the stack trace and return it.
620 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
621 return exc();
622 }
623 }
624
625 intptr_t Universe::_non_oop_bits = 0;
626
627 void* Universe::non_oop_word() {
628 // Neither the high bits nor the low bits of this value is allowed
629 // to look like (respectively) the high or low bits of a real oop.
630 //
631 // High and low are CPU-specific notions, but low always includes
632 // the low-order bit. Since oops are always aligned at least mod 4,
633 // setting the low-order bit will ensure that the low half of the
634 // word will never look like that of a real oop.
635 //
636 // Using the OS-supplied non-memory-address word (usually 0 or -1)
637 // will take care of the high bits, however many there are.
638
639 if (_non_oop_bits == 0) {
640 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
641 }
642
643 return (void*)_non_oop_bits;
644 }
645
646 jint universe_init() {
647 assert(!Universe::_fully_initialized, "called after initialize_vtables");
648 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
649 "LogHeapWordSize is incorrect.");
650 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
651 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
652 "oop size is not not a multiple of HeapWord size");
653
654 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
655
656 JavaClasses::compute_hard_coded_offsets();
657
658 jint status = Universe::initialize_heap();
659 if (status != JNI_OK) {
660 return status;
661 }
662
663 Metaspace::global_initialize();
664
665 // Initialize performance counters for metaspaces
666 MetaspaceCounters::initialize_performance_counters();
667 CompressedClassSpaceCounters::initialize_performance_counters();
668
669 AOTLoader::universe_init();
670
671 // Checks 'AfterMemoryInit' constraints.
672 if (!CommandLineFlagConstraintList::check_constraints(CommandLineFlagConstraint::AfterMemoryInit)) {
673 return JNI_EINVAL;
674 }
675
676 // Create memory for metadata. Must be after initializing heap for
677 // DumpSharedSpaces.
678 ClassLoaderData::init_null_class_loader_data();
679
680 // We have a heap so create the Method* caches before
681 // Metaspace::initialize_shared_spaces() tries to populate them.
682 Universe::_finalizer_register_cache = new LatestMethodCache();
683 Universe::_loader_addClass_cache = new LatestMethodCache();
684 Universe::_pd_implies_cache = new LatestMethodCache();
685 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
686 Universe::_do_stack_walk_cache = new LatestMethodCache();
687
688 #if INCLUDE_CDS
689 if (UseSharedSpaces) {
690 // Read the data structures supporting the shared spaces (shared
691 // system dictionary, symbol table, etc.). After that, access to
692 // the file (other than the mapped regions) is no longer needed, and
693 // the file is closed. Closing the file does not affect the
694 // currently mapped regions.
695 MetaspaceShared::initialize_shared_spaces();
696 StringTable::create_table();
697 } else
698 #endif
699 {
700 SymbolTable::create_table();
701 StringTable::create_table();
702
703 #if INCLUDE_CDS
704 if (DumpSharedSpaces) {
705 MetaspaceShared::prepare_for_dumping();
706 }
707 #endif
708 }
709 if (strlen(VerifySubSet) > 0) {
710 Universe::initialize_verify_flags();
711 }
712
713 ResolvedMethodTable::create_table();
714
715 return JNI_OK;
716 }
717
718 CollectedHeap* Universe::create_heap() {
719 assert(_collectedHeap == NULL, "Heap already created");
720 assert(GCArguments::is_initialized(), "GC must be initialized here");
721 return GCArguments::arguments()->create_heap();
722 }
723
724 // Choose the heap base address and oop encoding mode
725 // when compressed oops are used:
726 // Unscaled - Use 32-bits oops without encoding when
727 // NarrowOopHeapBaseMin + heap_size < 4Gb
728 // ZeroBased - Use zero based compressed oops with encoding when
729 // NarrowOopHeapBaseMin + heap_size < 32Gb
730 // HeapBased - Use compressed oops with heap base + encoding.
731
732 jint Universe::initialize_heap() {
733 _collectedHeap = create_heap();
734 jint status = _collectedHeap->initialize();
735 if (status != JNI_OK) {
736 return status;
737 }
738 log_info(gc)("Using %s", _collectedHeap->name());
739
740 GCArguments::arguments()->post_heap_initialize();
741 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
742
743 #ifdef _LP64
744 if (UseCompressedOops) {
745 // Subtract a page because something can get allocated at heap base.
746 // This also makes implicit null checking work, because the
747 // memory+1 page below heap_base needs to cause a signal.
748 // See needs_explicit_null_check.
749 // Only set the heap base for compressed oops because it indicates
750 // compressed oops for pstack code.
751 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) {
752 // Didn't reserve heap below 4Gb. Must shift.
753 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
754 }
755 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) {
756 // Did reserve heap below 32Gb. Can use base == 0;
757 Universe::set_narrow_oop_base(0);
758 }
759
760 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base());
761
762 LogTarget(Info, gc, heap, coops) lt;
763 if (lt.is_enabled()) {
764 ResourceMark rm;
765 LogStream ls(lt);
766 Universe::print_compressed_oops_mode(&ls);
767 }
768
769 // Tell tests in which mode we run.
770 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode",
771 narrow_oop_mode_to_string(narrow_oop_mode()),
772 false));
773 }
774 // Universe::narrow_oop_base() is one page below the heap.
775 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() -
776 os::vm_page_size()) ||
777 Universe::narrow_oop_base() == NULL, "invalid value");
778 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes ||
779 Universe::narrow_oop_shift() == 0, "invalid value");
780 #endif
781
782 // We will never reach the CATCH below since Exceptions::_throw will cause
783 // the VM to exit if an exception is thrown during initialization
784
785 if (UseTLAB) {
786 assert(Universe::heap()->supports_tlab_allocation(),
787 "Should support thread-local allocation buffers");
788 ThreadLocalAllocBuffer::startup_initialization();
789 }
790 return JNI_OK;
791 }
792
793 void Universe::print_compressed_oops_mode(outputStream* st) {
794 st->print("Heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
795 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M);
796
797 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode()));
798
799 if (Universe::narrow_oop_base() != 0) {
800 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base()));
801 }
802
803 if (Universe::narrow_oop_shift() != 0) {
804 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
805 }
806
807 if (!Universe::narrow_oop_use_implicit_null_checks()) {
808 st->print(", no protected page in front of the heap");
809 }
810 st->cr();
811 }
812
813 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
814
815 assert(alignment <= Arguments::conservative_max_heap_alignment(),
816 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
817 alignment, Arguments::conservative_max_heap_alignment());
818
819 size_t total_reserved = align_up(heap_size, alignment);
820 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
821 "heap size is too big for compressed oops");
822
823 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size());
824 assert(!UseLargePages
825 || UseParallelGC
826 || use_large_pages, "Wrong alignment to use large pages");
827
828 // Now create the space.
829 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt);
830
831 if (total_rs.is_reserved()) {
832 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
833 "must be exactly of required size and alignment");
834 // We are good.
835
836 if (UseCompressedOops) {
837 // Universe::initialize_heap() will reset this to NULL if unscaled
838 // or zero-based narrow oops are actually used.
839 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
840 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
841 }
842
843 if (AllocateHeapAt != NULL) {
844 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
845 }
846 return total_rs;
847 }
848
849 vm_exit_during_initialization(
850 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
851 total_reserved/K));
852
853 // satisfy compiler
854 ShouldNotReachHere();
855 return ReservedHeapSpace(0, 0, false);
856 }
857
858
859 // It's the caller's responsibility to ensure glitch-freedom
860 // (if required).
861 void Universe::update_heap_info_at_gc() {
862 _heap_capacity_at_last_gc = heap()->capacity();
863 _heap_used_at_last_gc = heap()->used();
864 }
865
866
867 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) {
868 switch (mode) {
869 case UnscaledNarrowOop:
870 return "32-bit";
871 case ZeroBasedNarrowOop:
872 return "Zero based";
873 case DisjointBaseNarrowOop:
874 return "Non-zero disjoint base";
875 case HeapBasedNarrowOop:
876 return "Non-zero based";
877 default:
878 ShouldNotReachHere();
879 return "";
880 }
881 }
882
883
884 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() {
885 if (narrow_oop_base_disjoint()) {
886 return DisjointBaseNarrowOop;
887 }
888
889 if (narrow_oop_base() != 0) {
890 return HeapBasedNarrowOop;
891 }
892
893 if (narrow_oop_shift() != 0) {
894 return ZeroBasedNarrowOop;
895 }
896
897 return UnscaledNarrowOop;
898 }
899
900 void initialize_known_method(LatestMethodCache* method_cache,
901 InstanceKlass* ik,
902 const char* method,
903 Symbol* signature,
904 bool is_static, TRAPS)
905 {
906 TempNewSymbol name = SymbolTable::new_symbol(method, CHECK);
907 Method* m = NULL;
908 // The klass must be linked before looking up the method.
909 if (!ik->link_class_or_fail(THREAD) ||
910 ((m = ik->find_method(name, signature)) == NULL) ||
911 is_static != m->is_static()) {
912 ResourceMark rm(THREAD);
913 // NoSuchMethodException doesn't actually work because it tries to run the
914 // <init> function before java_lang_Class is linked. Print error and exit.
915 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
916 ik->name()->as_C_string(), method));
917 }
918 method_cache->init(ik, m);
919 }
920
921 void Universe::initialize_known_methods(TRAPS) {
922 // Set up static method for registering finalizers
923 initialize_known_method(_finalizer_register_cache,
924 SystemDictionary::Finalizer_klass(),
925 "register",
926 vmSymbols::object_void_signature(), true, CHECK);
927
928 initialize_known_method(_throw_illegal_access_error_cache,
929 SystemDictionary::internal_Unsafe_klass(),
930 "throwIllegalAccessError",
931 vmSymbols::void_method_signature(), true, CHECK);
932
933 // Set up method for registering loaded classes in class loader vector
934 initialize_known_method(_loader_addClass_cache,
935 SystemDictionary::ClassLoader_klass(),
936 "addClass",
937 vmSymbols::class_void_signature(), false, CHECK);
938
939 // Set up method for checking protection domain
940 initialize_known_method(_pd_implies_cache,
941 SystemDictionary::ProtectionDomain_klass(),
942 "impliesCreateAccessControlContext",
943 vmSymbols::void_boolean_signature(), false, CHECK);
944
945 // Set up method for stack walking
946 initialize_known_method(_do_stack_walk_cache,
947 SystemDictionary::AbstractStackWalker_klass(),
948 "doStackWalk",
949 vmSymbols::doStackWalk_signature(), false, CHECK);
950 }
951
952 void universe2_init() {
953 EXCEPTION_MARK;
954 Universe::genesis(CATCH);
955 }
956
957 // Set after initialization of the module runtime, call_initModuleRuntime
958 void universe_post_module_init() {
959 Universe::_module_initialized = true;
960 }
961
962 bool universe_post_init() {
963 assert(!is_init_completed(), "Error: initialization not yet completed!");
964 Universe::_fully_initialized = true;
965 EXCEPTION_MARK;
966 { ResourceMark rm;
967 Interpreter::initialize(); // needed for interpreter entry points
968 if (!UseSharedSpaces) {
969 HandleMark hm(THREAD);
970 Klass* ok = SystemDictionary::Object_klass();
971 Universe::reinitialize_vtable_of(ok, CHECK_false);
972 Universe::reinitialize_itables(CHECK_false);
973 }
974 }
975
976 HandleMark hm(THREAD);
977 // Setup preallocated empty java.lang.Class array
978 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
979
980 // Setup preallocated OutOfMemoryError errors
981 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
982 InstanceKlass* ik = InstanceKlass::cast(k);
983 Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false);
984 Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false);
985 Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false);
986 Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false);
987 Universe::_out_of_memory_error_gc_overhead_limit =
988 ik->allocate_instance(CHECK_false);
989 Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false);
990
991 // Setup preallocated cause message for delayed StackOverflowError
992 if (StackReservedPages > 0) {
993 Universe::_delayed_stack_overflow_error_message =
994 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
995 }
996
997 // Setup preallocated NullPointerException
998 // (this is currently used for a cheap & dirty solution in compiler exception handling)
999 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
1000 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1001 // Setup preallocated ArithmeticException
1002 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1003 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
1004 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1005 // Virtual Machine Error for when we get into a situation we can't resolve
1006 k = SystemDictionary::resolve_or_fail(
1007 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
1008 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1009 if (!linked) {
1010 tty->print_cr("Unable to link/verify VirtualMachineError class");
1011 return false; // initialization failed
1012 }
1013 Universe::_virtual_machine_error_instance =
1014 InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1015
1016 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1017
1018 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
1019 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
1020
1021 msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
1022 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
1023 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
1024 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
1025
1026 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
1027 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
1028
1029 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
1030 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
1031
1032 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false);
1033 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg());
1034
1035 msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1036 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
1037
1038 // Setup the array of errors that have preallocated backtrace
1039 k = Universe::_out_of_memory_error_java_heap->klass();
1040 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
1041 ik = InstanceKlass::cast(k);
1042
1043 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
1044 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false);
1045 for (int i=0; i<len; i++) {
1046 oop err = ik->allocate_instance(CHECK_false);
1047 Handle err_h = Handle(THREAD, err);
1048 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
1049 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
1050 }
1051 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
1052
1053 Universe::initialize_known_methods(CHECK_false);
1054
1055 // This needs to be done before the first scavenge/gc, since
1056 // it's an input to soft ref clearing policy.
1057 {
1058 MutexLocker x(Heap_lock);
1059 Universe::update_heap_info_at_gc();
1060 }
1061
1062 // ("weak") refs processing infrastructure initialization
1063 Universe::heap()->post_initialize();
1064
1065 MemoryService::add_metaspace_memory_pools();
1066
1067 MemoryService::set_universe_heap(Universe::heap());
1068 #if INCLUDE_CDS
1069 SharedClassUtil::initialize(CHECK_false);
1070 #endif
1071 return true;
1072 }
1073
1074
1075 void Universe::compute_base_vtable_size() {
1076 _base_vtable_size = ClassLoader::compute_Object_vtable();
1077 }
1078
1079 void Universe::print_on(outputStream* st) {
1080 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1081 st->print_cr("Heap");
1082 heap()->print_on(st);
1083 }
1084
1085 void Universe::print_heap_at_SIGBREAK() {
1086 if (PrintHeapAtSIGBREAK) {
1087 print_on(tty);
1088 tty->cr();
1089 tty->flush();
1090 }
1091 }
1092
1093 void Universe::print_heap_before_gc() {
1094 LogTarget(Debug, gc, heap) lt;
1095 if (lt.is_enabled()) {
1096 LogStream ls(lt);
1097 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1098 ResourceMark rm;
1099 heap()->print_on(&ls);
1100 }
1101 }
1102
1103 void Universe::print_heap_after_gc() {
1104 LogTarget(Debug, gc, heap) lt;
1105 if (lt.is_enabled()) {
1106 LogStream ls(lt);
1107 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1108 ResourceMark rm;
1109 heap()->print_on(&ls);
1110 }
1111 }
1112
1113 void Universe::initialize_verify_flags() {
1114 verify_flags = 0;
1115 const char delimiter[] = " ,";
1116
1117 size_t length = strlen(VerifySubSet);
1118 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1119 strncpy(subset_list, VerifySubSet, length + 1);
1120
1121 char* token = strtok(subset_list, delimiter);
1122 while (token != NULL) {
1123 if (strcmp(token, "threads") == 0) {
1124 verify_flags |= Verify_Threads;
1125 } else if (strcmp(token, "heap") == 0) {
1126 verify_flags |= Verify_Heap;
1127 } else if (strcmp(token, "symbol_table") == 0) {
1128 verify_flags |= Verify_SymbolTable;
1129 } else if (strcmp(token, "string_table") == 0) {
1130 verify_flags |= Verify_StringTable;
1131 } else if (strcmp(token, "codecache") == 0) {
1132 verify_flags |= Verify_CodeCache;
1133 } else if (strcmp(token, "dictionary") == 0) {
1134 verify_flags |= Verify_SystemDictionary;
1135 } else if (strcmp(token, "classloader_data_graph") == 0) {
1136 verify_flags |= Verify_ClassLoaderDataGraph;
1137 } else if (strcmp(token, "metaspace") == 0) {
1138 verify_flags |= Verify_MetaspaceAux;
1139 } else if (strcmp(token, "jni_handles") == 0) {
1140 verify_flags |= Verify_JNIHandles;
1141 } else if (strcmp(token, "codecache_oops") == 0) {
1142 verify_flags |= Verify_CodeCacheOops;
1143 } else {
1144 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1145 }
1146 token = strtok(NULL, delimiter);
1147 }
1148 FREE_C_HEAP_ARRAY(char, subset_list);
1149 }
1150
1151 bool Universe::should_verify_subset(uint subset) {
1152 if (verify_flags & subset) {
1153 return true;
1154 }
1155 return false;
1156 }
1157
1158 void Universe::verify(VerifyOption option, const char* prefix) {
1159 // The use of _verify_in_progress is a temporary work around for
1160 // 6320749. Don't bother with a creating a class to set and clear
1161 // it since it is only used in this method and the control flow is
1162 // straight forward.
1163 _verify_in_progress = true;
1164
1165 COMPILER2_PRESENT(
1166 assert(!DerivedPointerTable::is_active(),
1167 "DPT should not be active during verification "
1168 "(of thread stacks below)");
1169 )
1170
1171 ResourceMark rm;
1172 HandleMark hm; // Handles created during verification can be zapped
1173 _verify_count++;
1174
1175 FormatBuffer<> title("Verifying %s", prefix);
1176 GCTraceTime(Info, gc, verify) tm(title.buffer());
1177 if (should_verify_subset(Verify_Threads)) {
1178 log_debug(gc, verify)("Threads");
1179 Threads::verify();
1180 }
1181 if (should_verify_subset(Verify_Heap)) {
1182 log_debug(gc, verify)("Heap");
1183 heap()->verify(option);
1184 }
1185 if (should_verify_subset(Verify_SymbolTable)) {
1186 log_debug(gc, verify)("SymbolTable");
1187 SymbolTable::verify();
1188 }
1189 if (should_verify_subset(Verify_StringTable)) {
1190 log_debug(gc, verify)("StringTable");
1191 StringTable::verify();
1192 }
1193 if (should_verify_subset(Verify_CodeCache)) {
1194 {
1195 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1196 log_debug(gc, verify)("CodeCache");
1197 CodeCache::verify();
1198 }
1199 }
1200 if (should_verify_subset(Verify_SystemDictionary)) {
1201 log_debug(gc, verify)("SystemDictionary");
1202 SystemDictionary::verify();
1203 }
1204 #ifndef PRODUCT
1205 if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1206 log_debug(gc, verify)("ClassLoaderDataGraph");
1207 ClassLoaderDataGraph::verify();
1208 }
1209 #endif
1210 if (should_verify_subset(Verify_MetaspaceAux)) {
1211 log_debug(gc, verify)("MetaspaceAux");
1212 MetaspaceAux::verify_free_chunks();
1213 }
1214 if (should_verify_subset(Verify_JNIHandles)) {
1215 log_debug(gc, verify)("JNIHandles");
1216 JNIHandles::verify();
1217 }
1218 if (should_verify_subset(Verify_CodeCacheOops)) {
1219 log_debug(gc, verify)("CodeCache Oops");
1220 CodeCache::verify_oops();
1221 }
1222
1223 _verify_in_progress = false;
1224 }
1225
1226
1227 #ifndef PRODUCT
1228 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1229 assert(low_boundary < high_boundary, "bad interval");
1230
1231 // decide which low-order bits we require to be clear:
1232 size_t alignSize = MinObjAlignmentInBytes;
1233 size_t min_object_size = CollectedHeap::min_fill_size();
1234
1235 // make an inclusive limit:
1236 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1237 uintptr_t min = (uintptr_t)low_boundary;
1238 assert(min < max, "bad interval");
1239 uintptr_t diff = max ^ min;
1240
1241 // throw away enough low-order bits to make the diff vanish
1242 uintptr_t mask = (uintptr_t)(-1);
1243 while ((mask & diff) != 0)
1244 mask <<= 1;
1245 uintptr_t bits = (min & mask);
1246 assert(bits == (max & mask), "correct mask");
1247 // check an intermediate value between min and max, just to make sure:
1248 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1249
1250 // require address alignment, too:
1251 mask |= (alignSize - 1);
1252
1253 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1254 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1255 }
1256 _verify_oop_mask = mask;
1257 _verify_oop_bits = bits;
1258 }
1259
1260 // Oop verification (see MacroAssembler::verify_oop)
1261
1262 uintptr_t Universe::verify_oop_mask() {
1263 MemRegion m = heap()->reserved_region();
1264 calculate_verify_data(m.start(), m.end());
1265 return _verify_oop_mask;
1266 }
1267
1268 uintptr_t Universe::verify_oop_bits() {
1269 MemRegion m = heap()->reserved_region();
1270 calculate_verify_data(m.start(), m.end());
1271 return _verify_oop_bits;
1272 }
1273
1274 uintptr_t Universe::verify_mark_mask() {
1275 return markOopDesc::lock_mask_in_place;
1276 }
1277
1278 uintptr_t Universe::verify_mark_bits() {
1279 intptr_t mask = verify_mark_mask();
1280 intptr_t bits = (intptr_t)markOopDesc::prototype();
1281 assert((bits & ~mask) == 0, "no stray header bits");
1282 return bits;
1283 }
1284 #endif // PRODUCT
1285
1286
1287 void Universe::compute_verify_oop_data() {
1288 verify_oop_mask();
1289 verify_oop_bits();
1290 verify_mark_mask();
1291 verify_mark_bits();
1292 }
1293
1294
1295 void LatestMethodCache::init(Klass* k, Method* m) {
1296 if (!UseSharedSpaces) {
1297 _klass = k;
1298 }
1299 #ifndef PRODUCT
1300 else {
1301 // sharing initilization should have already set up _klass
1302 assert(_klass != NULL, "just checking");
1303 }
1304 #endif
1305
1306 _method_idnum = m->method_idnum();
1307 assert(_method_idnum >= 0, "sanity check");
1308 }
1309
1310
1311 Method* LatestMethodCache::get_method() {
1312 if (klass() == NULL) return NULL;
1313 InstanceKlass* ik = InstanceKlass::cast(klass());
1314 Method* m = ik->method_with_idnum(method_idnum());
1315 assert(m != NULL, "sanity check");
1316 return m;
1317 }
1318
1319
1320 #ifdef ASSERT
1321 // Release dummy object(s) at bottom of heap
1322 bool Universe::release_fullgc_alot_dummy() {
1323 MutexLocker ml(FullGCALot_lock);
1324 if (_fullgc_alot_dummy_array != NULL) {
1325 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
1326 // No more dummies to release, release entire array instead
1327 _fullgc_alot_dummy_array = NULL;
1328 return false;
1329 }
1330 if (!UseConcMarkSweepGC) {
1331 // Release dummy at bottom of old generation
1332 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1333 }
1334 // Release dummy at bottom of permanent generation
1335 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1336 }
1337 return true;
1338 }
1339
1340 #endif // ASSERT