1 /*
2 * Copyright (c) 1997, 2015, 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 "classfile/classLoader.hpp"
27 #include "classfile/classLoaderData.hpp"
28 #include "classfile/javaClasses.hpp"
29 #include "classfile/stringTable.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "code/codeCache.hpp"
33 #include "code/dependencies.hpp"
34 #include "gc/shared/cardTableModRefBS.hpp"
35 #include "gc/shared/collectedHeap.inline.hpp"
36 #include "gc/shared/gcLocker.inline.hpp"
37 #include "gc/shared/genCollectedHeap.hpp"
38 #include "gc/shared/generation.hpp"
39 #include "gc/shared/space.hpp"
40 #include "interpreter/interpreter.hpp"
41 #include "memory/filemap.hpp"
42 #include "memory/metadataFactory.hpp"
43 #include "memory/metaspaceShared.hpp"
44 #include "memory/oopFactory.hpp"
45 #include "memory/universe.hpp"
46 #include "memory/universe.inline.hpp"
47 #include "oops/constantPool.hpp"
48 #include "oops/instanceClassLoaderKlass.hpp"
49 #include "oops/instanceKlass.hpp"
50 #include "oops/instanceMirrorKlass.hpp"
51 #include "oops/instanceRefKlass.hpp"
52 #include "oops/objArrayOop.inline.hpp"
53 #include "oops/oop.inline.hpp"
54 #include "oops/typeArrayKlass.hpp"
55 #include "prims/jvmtiRedefineClassesTrace.hpp"
56 #include "runtime/arguments.hpp"
57 #include "runtime/atomic.inline.hpp"
58 #include "runtime/commandLineFlagConstraintList.hpp"
59 #include "runtime/deoptimization.hpp"
60 #include "runtime/fprofiler.hpp"
61 #include "runtime/handles.inline.hpp"
62 #include "runtime/init.hpp"
63 #include "runtime/java.hpp"
64 #include "runtime/javaCalls.hpp"
65 #include "runtime/sharedRuntime.hpp"
66 #include "runtime/synchronizer.hpp"
67 #include "runtime/thread.inline.hpp"
68 #include "runtime/timer.hpp"
69 #include "runtime/vm_operations.hpp"
70 #include "services/memoryService.hpp"
71 #include "utilities/copy.hpp"
72 #include "utilities/events.hpp"
73 #include "utilities/hashtable.inline.hpp"
74 #include "utilities/macros.hpp"
75 #include "utilities/preserveException.hpp"
76 #if INCLUDE_ALL_GCS
77 #include "gc/cms/cmsCollectorPolicy.hpp"
78 #include "gc/g1/g1CollectedHeap.inline.hpp"
79 #include "gc/g1/g1CollectorPolicy.hpp"
80 #include "gc/parallel/parallelScavengeHeap.hpp"
81 #include "gc/shared/adaptiveSizePolicy.hpp"
82 #endif // INCLUDE_ALL_GCS
83 #if INCLUDE_CDS
84 #include "classfile/sharedClassUtil.hpp"
85 #endif
86
87 // Known objects
88 Klass* Universe::_boolArrayKlassObj = NULL;
89 Klass* Universe::_byteArrayKlassObj = NULL;
90 Klass* Universe::_charArrayKlassObj = NULL;
91 Klass* Universe::_intArrayKlassObj = NULL;
92 Klass* Universe::_shortArrayKlassObj = NULL;
93 Klass* Universe::_longArrayKlassObj = NULL;
94 Klass* Universe::_singleArrayKlassObj = NULL;
95 Klass* Universe::_doubleArrayKlassObj = NULL;
96 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ };
97 Klass* Universe::_objectArrayKlassObj = NULL;
98 oop Universe::_int_mirror = NULL;
99 oop Universe::_float_mirror = NULL;
100 oop Universe::_double_mirror = NULL;
101 oop Universe::_byte_mirror = NULL;
102 oop Universe::_bool_mirror = NULL;
103 oop Universe::_char_mirror = NULL;
104 oop Universe::_long_mirror = NULL;
105 oop Universe::_short_mirror = NULL;
106 oop Universe::_void_mirror = NULL;
107 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ };
108 oop Universe::_main_thread_group = NULL;
109 oop Universe::_system_thread_group = NULL;
110 objArrayOop Universe::_the_empty_class_klass_array = NULL;
111 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
112 oop Universe::_the_null_string = NULL;
113 oop Universe::_the_min_jint_string = NULL;
114 LatestMethodCache* Universe::_finalizer_register_cache = NULL;
115 LatestMethodCache* Universe::_loader_addClass_cache = NULL;
116 LatestMethodCache* Universe::_pd_implies_cache = NULL;
117 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL;
118 oop Universe::_out_of_memory_error_java_heap = NULL;
119 oop Universe::_out_of_memory_error_metaspace = NULL;
120 oop Universe::_out_of_memory_error_class_metaspace = NULL;
121 oop Universe::_out_of_memory_error_array_size = NULL;
122 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL;
123 oop Universe::_out_of_memory_error_realloc_objects = NULL;
124 oop Universe::_delayed_stack_overflow_error_message = NULL;
125 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL;
126 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
127 bool Universe::_verify_in_progress = false;
128 oop Universe::_null_ptr_exception_instance = NULL;
129 oop Universe::_arithmetic_exception_instance = NULL;
130 oop Universe::_virtual_machine_error_instance = NULL;
131 oop Universe::_vm_exception = NULL;
132 oop Universe::_allocation_context_notification_obj = NULL;
133
134 Array<int>* Universe::_the_empty_int_array = NULL;
135 Array<u2>* Universe::_the_empty_short_array = NULL;
136 Array<Klass*>* Universe::_the_empty_klass_array = NULL;
137 Array<Method*>* Universe::_the_empty_method_array = NULL;
138
139 // These variables are guarded by FullGCALot_lock.
140 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;)
141 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
142
143 // Heap
144 int Universe::_verify_count = 0;
145
146 // Oop verification (see MacroAssembler::verify_oop)
147 uintptr_t Universe::_verify_oop_mask = 0;
148 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
149
150 int Universe::_base_vtable_size = 0;
151 bool Universe::_bootstrapping = false;
152 bool Universe::_fully_initialized = false;
153
154 size_t Universe::_heap_capacity_at_last_gc;
155 size_t Universe::_heap_used_at_last_gc = 0;
156
157 CollectedHeap* Universe::_collectedHeap = NULL;
158
159 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true };
160 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true };
161 address Universe::_narrow_ptrs_base;
162
163 void Universe::basic_type_classes_do(void f(Klass*)) {
164 f(boolArrayKlassObj());
165 f(byteArrayKlassObj());
166 f(charArrayKlassObj());
167 f(intArrayKlassObj());
168 f(shortArrayKlassObj());
169 f(longArrayKlassObj());
170 f(singleArrayKlassObj());
171 f(doubleArrayKlassObj());
172 }
173
174 void Universe::oops_do(OopClosure* f, bool do_all) {
175
176 f->do_oop((oop*) &_int_mirror);
177 f->do_oop((oop*) &_float_mirror);
178 f->do_oop((oop*) &_double_mirror);
179 f->do_oop((oop*) &_byte_mirror);
180 f->do_oop((oop*) &_bool_mirror);
181 f->do_oop((oop*) &_char_mirror);
182 f->do_oop((oop*) &_long_mirror);
183 f->do_oop((oop*) &_short_mirror);
184 f->do_oop((oop*) &_void_mirror);
185
186 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
187 f->do_oop((oop*) &_mirrors[i]);
188 }
189 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
190
191 f->do_oop((oop*)&_the_empty_class_klass_array);
192 f->do_oop((oop*)&_the_null_string);
193 f->do_oop((oop*)&_the_min_jint_string);
194 f->do_oop((oop*)&_out_of_memory_error_java_heap);
195 f->do_oop((oop*)&_out_of_memory_error_metaspace);
196 f->do_oop((oop*)&_out_of_memory_error_class_metaspace);
197 f->do_oop((oop*)&_out_of_memory_error_array_size);
198 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit);
199 f->do_oop((oop*)&_out_of_memory_error_realloc_objects);
200 f->do_oop((oop*)&_delayed_stack_overflow_error_message);
201 f->do_oop((oop*)&_preallocated_out_of_memory_error_array);
202 f->do_oop((oop*)&_null_ptr_exception_instance);
203 f->do_oop((oop*)&_arithmetic_exception_instance);
204 f->do_oop((oop*)&_virtual_machine_error_instance);
205 f->do_oop((oop*)&_main_thread_group);
206 f->do_oop((oop*)&_system_thread_group);
207 f->do_oop((oop*)&_vm_exception);
208 f->do_oop((oop*)&_allocation_context_notification_obj);
209 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);)
210 }
211
212 // Serialize metadata in and out of CDS archive, not oops.
213 void Universe::serialize(SerializeClosure* f, bool do_all) {
214
215 f->do_ptr((void**)&_boolArrayKlassObj);
216 f->do_ptr((void**)&_byteArrayKlassObj);
217 f->do_ptr((void**)&_charArrayKlassObj);
218 f->do_ptr((void**)&_intArrayKlassObj);
219 f->do_ptr((void**)&_shortArrayKlassObj);
220 f->do_ptr((void**)&_longArrayKlassObj);
221 f->do_ptr((void**)&_singleArrayKlassObj);
222 f->do_ptr((void**)&_doubleArrayKlassObj);
223 f->do_ptr((void**)&_objectArrayKlassObj);
224
225 {
226 for (int i = 0; i < T_VOID+1; i++) {
227 if (_typeArrayKlassObjs[i] != NULL) {
228 assert(i >= T_BOOLEAN, "checking");
229 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
230 } else if (do_all) {
231 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
232 }
233 }
234 }
235
236 f->do_ptr((void**)&_the_array_interfaces_array);
237 f->do_ptr((void**)&_the_empty_int_array);
238 f->do_ptr((void**)&_the_empty_short_array);
239 f->do_ptr((void**)&_the_empty_method_array);
240 f->do_ptr((void**)&_the_empty_klass_array);
241 _finalizer_register_cache->serialize(f);
242 _loader_addClass_cache->serialize(f);
243 _pd_implies_cache->serialize(f);
244 _throw_illegal_access_error_cache->serialize(f);
245 }
246
247 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
248 if (size < alignment || size % alignment != 0) {
249 vm_exit_during_initialization(
250 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
251 }
252 }
253
254 void initialize_basic_type_klass(Klass* k, TRAPS) {
255 Klass* ok = SystemDictionary::Object_klass();
256 if (UseSharedSpaces) {
257 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
258 assert(k->super() == ok, "u3");
259 k->restore_unshareable_info(loader_data, Handle(), CHECK);
260 } else {
261 k->initialize_supers(ok, CHECK);
262 }
263 k->append_to_sibling_list();
264 }
265
266 void Universe::genesis(TRAPS) {
267 ResourceMark rm;
268
269 { FlagSetting fs(_bootstrapping, true);
270
271 { MutexLocker mc(Compile_lock);
272
273 // determine base vtable size; without that we cannot create the array klasses
274 compute_base_vtable_size();
275
276 if (!UseSharedSpaces) {
277 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK);
278 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK);
279 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK);
280 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK);
281 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK);
282 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK);
283 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK);
284 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK);
285
286 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj;
287 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj;
288 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj;
289 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj;
290 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj;
291 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj;
292 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj;
293 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj;
294
295 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
296
297 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
298 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
299 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
300 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
301 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
302 }
303 }
304
305 vmSymbols::initialize(CHECK);
306
307 SystemDictionary::initialize(CHECK);
308
309 Klass* ok = SystemDictionary::Object_klass();
310
311 _the_null_string = StringTable::intern("null", CHECK);
312 _the_min_jint_string = StringTable::intern("-2147483648", CHECK);
313
314 if (UseSharedSpaces) {
315 // Verify shared interfaces array.
316 assert(_the_array_interfaces_array->at(0) ==
317 SystemDictionary::Cloneable_klass(), "u3");
318 assert(_the_array_interfaces_array->at(1) ==
319 SystemDictionary::Serializable_klass(), "u3");
320 MetaspaceShared::fixup_shared_string_regions();
321 } else {
322 // Set up shared interfaces array. (Do this before supers are set up.)
323 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
324 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
325 }
326
327 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
328 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
329 initialize_basic_type_klass(singleArrayKlassObj(), CHECK);
330 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
331 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
332 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
333 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
334 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
335 } // end of core bootstrapping
336
337 // Maybe this could be lifted up now that object array can be initialized
338 // during the bootstrapping.
339
340 // OLD
341 // Initialize _objectArrayKlass after core bootstraping to make
342 // sure the super class is set up properly for _objectArrayKlass.
343 // ---
344 // NEW
345 // Since some of the old system object arrays have been converted to
346 // ordinary object arrays, _objectArrayKlass will be loaded when
347 // SystemDictionary::initialize(CHECK); is run. See the extra check
348 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
349 _objectArrayKlassObj = InstanceKlass::
350 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
351 // OLD
352 // Add the class to the class hierarchy manually to make sure that
353 // its vtable is initialized after core bootstrapping is completed.
354 // ---
355 // New
356 // Have already been initialized.
357 _objectArrayKlassObj->append_to_sibling_list();
358
359 // Compute is_jdk version flags.
360 // Only 1.3 or later has the java.lang.Shutdown class.
361 // Only 1.4 or later has the java.lang.CharSequence interface.
362 // Only 1.5 or later has the java.lang.management.MemoryUsage class.
363 if (JDK_Version::is_partially_initialized()) {
364 uint8_t jdk_version;
365 Klass* k = SystemDictionary::resolve_or_null(
366 vmSymbols::java_lang_management_MemoryUsage(), THREAD);
367 CLEAR_PENDING_EXCEPTION; // ignore exceptions
368 if (k == NULL) {
369 k = SystemDictionary::resolve_or_null(
370 vmSymbols::java_lang_CharSequence(), THREAD);
371 CLEAR_PENDING_EXCEPTION; // ignore exceptions
372 if (k == NULL) {
373 k = SystemDictionary::resolve_or_null(
374 vmSymbols::java_lang_Shutdown(), THREAD);
375 CLEAR_PENDING_EXCEPTION; // ignore exceptions
376 if (k == NULL) {
377 jdk_version = 2;
378 } else {
379 jdk_version = 3;
380 }
381 } else {
382 jdk_version = 4;
383 }
384 } else {
385 jdk_version = 5;
386 }
387 JDK_Version::fully_initialize(jdk_version);
388 }
389
390 #ifdef ASSERT
391 if (FullGCALot) {
392 // Allocate an array of dummy objects.
393 // We'd like these to be at the bottom of the old generation,
394 // so that when we free one and then collect,
395 // (almost) the whole heap moves
396 // and we find out if we actually update all the oops correctly.
397 // But we can't allocate directly in the old generation,
398 // so we allocate wherever, and hope that the first collection
399 // moves these objects to the bottom of the old generation.
400 // We can allocate directly in the permanent generation, so we do.
401 int size;
402 if (UseConcMarkSweepGC) {
403 warning("Using +FullGCALot with concurrent mark sweep gc "
404 "will not force all objects to relocate");
405 size = FullGCALotDummies;
406 } else {
407 size = FullGCALotDummies * 2;
408 }
409 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
410 objArrayHandle dummy_array(THREAD, naked_array);
411 int i = 0;
412 while (i < size) {
413 // Allocate dummy in old generation
414 oop dummy = InstanceKlass::cast(SystemDictionary::Object_klass())->allocate_instance(CHECK);
415 dummy_array->obj_at_put(i++, dummy);
416 }
417 {
418 // Only modify the global variable inside the mutex.
419 // If we had a race to here, the other dummy_array instances
420 // and their elements just get dropped on the floor, which is fine.
421 MutexLocker ml(FullGCALot_lock);
422 if (_fullgc_alot_dummy_array == NULL) {
423 _fullgc_alot_dummy_array = dummy_array();
424 }
425 }
426 assert(i == _fullgc_alot_dummy_array->length(), "just checking");
427 }
428 #endif
429
430 // Initialize dependency array for null class loader
431 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK);
432
433 }
434
435 // CDS support for patching vtables in metadata in the shared archive.
436 // All types inherited from Metadata have vtables, but not types inherited
437 // from MetaspaceObj, because the latter does not have virtual functions.
438 // If the metadata type has a vtable, it cannot be shared in the read-only
439 // section of the CDS archive, because the vtable pointer is patched.
440 static inline void add_vtable(void** list, int* n, void* o, int count) {
441 guarantee((*n) < count, "vtable list too small");
442 void* vtable = dereference_vptr(o);
443 assert(*(void**)(vtable) != NULL, "invalid vtable");
444 list[(*n)++] = vtable;
445 }
446
447 void Universe::init_self_patching_vtbl_list(void** list, int count) {
448 int n = 0;
449 { InstanceKlass o; add_vtable(list, &n, &o, count); }
450 { InstanceClassLoaderKlass o; add_vtable(list, &n, &o, count); }
451 { InstanceMirrorKlass o; add_vtable(list, &n, &o, count); }
452 { InstanceRefKlass o; add_vtable(list, &n, &o, count); }
453 { TypeArrayKlass o; add_vtable(list, &n, &o, count); }
454 { ObjArrayKlass o; add_vtable(list, &n, &o, count); }
455 { Method o; add_vtable(list, &n, &o, count); }
456 { ConstantPool o; add_vtable(list, &n, &o, count); }
457 }
458
459 void Universe::initialize_basic_type_mirrors(TRAPS) {
460 assert(_int_mirror==NULL, "basic type mirrors already initialized");
461 _int_mirror =
462 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK);
463 _float_mirror =
464 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK);
465 _double_mirror =
466 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK);
467 _byte_mirror =
468 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK);
469 _bool_mirror =
470 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
471 _char_mirror =
472 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK);
473 _long_mirror =
474 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK);
475 _short_mirror =
476 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK);
477 _void_mirror =
478 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK);
479
480 _mirrors[T_INT] = _int_mirror;
481 _mirrors[T_FLOAT] = _float_mirror;
482 _mirrors[T_DOUBLE] = _double_mirror;
483 _mirrors[T_BYTE] = _byte_mirror;
484 _mirrors[T_BOOLEAN] = _bool_mirror;
485 _mirrors[T_CHAR] = _char_mirror;
486 _mirrors[T_LONG] = _long_mirror;
487 _mirrors[T_SHORT] = _short_mirror;
488 _mirrors[T_VOID] = _void_mirror;
489 //_mirrors[T_OBJECT] = InstanceKlass::cast(_object_klass)->java_mirror();
490 //_mirrors[T_ARRAY] = InstanceKlass::cast(_object_klass)->java_mirror();
491 }
492
493 void Universe::fixup_mirrors(TRAPS) {
494 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
495 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
496 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
497 // that the number of objects allocated at this point is very small.
498 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
499 HandleMark hm(THREAD);
500 // Cache the start of the static fields
501 InstanceMirrorKlass::init_offset_of_static_fields();
502
503 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
504 int list_length = list->length();
505 for (int i = 0; i < list_length; i++) {
506 Klass* k = list->at(i);
507 assert(k->is_klass(), "List should only hold classes");
508 EXCEPTION_MARK;
509 KlassHandle kh(THREAD, k);
510 java_lang_Class::fixup_mirror(kh, CATCH);
511 }
512 delete java_lang_Class::fixup_mirror_list();
513 java_lang_Class::set_fixup_mirror_list(NULL);
514 }
515
516 static bool has_run_finalizers_on_exit = false;
517
518 void Universe::run_finalizers_on_exit() {
519 if (has_run_finalizers_on_exit) return;
520 has_run_finalizers_on_exit = true;
521
522 // Called on VM exit. This ought to be run in a separate thread.
523 if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit");
524 {
525 PRESERVE_EXCEPTION_MARK;
526 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass());
527 JavaValue result(T_VOID);
528 JavaCalls::call_static(
529 &result,
530 finalizer_klass,
531 vmSymbols::run_finalizers_on_exit_name(),
532 vmSymbols::void_method_signature(),
533 THREAD
534 );
535 // Ignore any pending exceptions
536 CLEAR_PENDING_EXCEPTION;
537 }
538 }
539
540
541 // initialize_vtable could cause gc if
542 // 1) we specified true to initialize_vtable and
543 // 2) this ran after gc was enabled
544 // In case those ever change we use handles for oops
545 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) {
546 // init vtable of k and all subclasses
547 Klass* ko = k_h();
548 klassVtable* vt = ko->vtable();
549 if (vt) vt->initialize_vtable(false, CHECK);
550 if (ko->oop_is_instance()) {
551 InstanceKlass* ik = (InstanceKlass*)ko;
552 for (KlassHandle s_h(THREAD, ik->subklass());
553 s_h() != NULL;
554 s_h = KlassHandle(THREAD, s_h()->next_sibling())) {
555 reinitialize_vtable_of(s_h, CHECK);
556 }
557 }
558 }
559
560
561 void initialize_itable_for_klass(Klass* k, TRAPS) {
562 InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK);
563 }
564
565
566 void Universe::reinitialize_itables(TRAPS) {
567 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK);
568
569 }
570
571
572 bool Universe::on_page_boundary(void* addr) {
573 return ((uintptr_t) addr) % os::vm_page_size() == 0;
574 }
575
576
577 bool Universe::should_fill_in_stack_trace(Handle throwable) {
578 // never attempt to fill in the stack trace of preallocated errors that do not have
579 // backtrace. These errors are kept alive forever and may be "re-used" when all
580 // preallocated errors with backtrace have been consumed. Also need to avoid
581 // a potential loop which could happen if an out of memory occurs when attempting
582 // to allocate the backtrace.
583 return ((throwable() != Universe::_out_of_memory_error_java_heap) &&
584 (throwable() != Universe::_out_of_memory_error_metaspace) &&
585 (throwable() != Universe::_out_of_memory_error_class_metaspace) &&
586 (throwable() != Universe::_out_of_memory_error_array_size) &&
587 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) &&
588 (throwable() != Universe::_out_of_memory_error_realloc_objects));
589 }
590
591
592 oop Universe::gen_out_of_memory_error(oop default_err) {
593 // generate an out of memory error:
594 // - if there is a preallocated error with backtrace available then return it wth
595 // a filled in stack trace.
596 // - if there are no preallocated errors with backtrace available then return
597 // an error without backtrace.
598 int next;
599 if (_preallocated_out_of_memory_error_avail_count > 0) {
600 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);
601 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
602 } else {
603 next = -1;
604 }
605 if (next < 0) {
606 // all preallocated errors have been used.
607 // return default
608 return default_err;
609 } else {
610 // get the error object at the slot and set set it to NULL so that the
611 // array isn't keeping it alive anymore.
612 oop exc = preallocated_out_of_memory_errors()->obj_at(next);
613 assert(exc != NULL, "slot has been used already");
614 preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
615
616 // use the message from the default error
617 oop msg = java_lang_Throwable::message(default_err);
618 assert(msg != NULL, "no message");
619 java_lang_Throwable::set_message(exc, msg);
620
621 // populate the stack trace and return it.
622 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
623 return exc;
624 }
625 }
626
627 intptr_t Universe::_non_oop_bits = 0;
628
629 void* Universe::non_oop_word() {
630 // Neither the high bits nor the low bits of this value is allowed
631 // to look like (respectively) the high or low bits of a real oop.
632 //
633 // High and low are CPU-specific notions, but low always includes
634 // the low-order bit. Since oops are always aligned at least mod 4,
635 // setting the low-order bit will ensure that the low half of the
636 // word will never look like that of a real oop.
637 //
638 // Using the OS-supplied non-memory-address word (usually 0 or -1)
639 // will take care of the high bits, however many there are.
640
641 if (_non_oop_bits == 0) {
642 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
643 }
644
645 return (void*)_non_oop_bits;
646 }
647
648 jint universe_init() {
649 assert(!Universe::_fully_initialized, "called after initialize_vtables");
650 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
651 "LogHeapWordSize is incorrect.");
652 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
653 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
654 "oop size is not not a multiple of HeapWord size");
655 TraceTime timer("Genesis", TraceStartupTime);
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 // Checks 'AfterMemoryInit' constraints.
666 if (!CommandLineFlagConstraintList::check_constraints(CommandLineFlagConstraint::AfterMemoryInit)) {
667 return JNI_EINVAL;
668 }
669
670 // Create memory for metadata. Must be after initializing heap for
671 // DumpSharedSpaces.
672 ClassLoaderData::init_null_class_loader_data();
673
674 // We have a heap so create the Method* caches before
675 // Metaspace::initialize_shared_spaces() tries to populate them.
676 Universe::_finalizer_register_cache = new LatestMethodCache();
677 Universe::_loader_addClass_cache = new LatestMethodCache();
678 Universe::_pd_implies_cache = new LatestMethodCache();
679 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
680
681 if (UseSharedSpaces) {
682 // Read the data structures supporting the shared spaces (shared
683 // system dictionary, symbol table, etc.). After that, access to
684 // the file (other than the mapped regions) is no longer needed, and
685 // the file is closed. Closing the file does not affect the
686 // currently mapped regions.
687 MetaspaceShared::initialize_shared_spaces();
688 StringTable::create_table();
689 } else {
690 SymbolTable::create_table();
691 StringTable::create_table();
692 ClassLoader::create_package_info_table();
693
694 if (DumpSharedSpaces) {
695 MetaspaceShared::prepare_for_dumping();
696 }
697 }
698
699 return JNI_OK;
700 }
701
702 CollectedHeap* Universe::create_heap() {
703 assert(_collectedHeap == NULL, "Heap already created");
704 #if !INCLUDE_ALL_GCS
705 if (UseParallelGC) {
706 fatal("UseParallelGC not supported in this VM.");
707 } else if (UseG1GC) {
708 fatal("UseG1GC not supported in this VM.");
709 } else if (UseConcMarkSweepGC) {
710 fatal("UseConcMarkSweepGC not supported in this VM.");
711 #else
712 if (UseParallelGC) {
713 return Universe::create_heap_with_policy<ParallelScavengeHeap, GenerationSizer>();
714 } else if (UseG1GC) {
715 return Universe::create_heap_with_policy<G1CollectedHeap, G1CollectorPolicy>();
716 } else if (UseConcMarkSweepGC) {
717 return Universe::create_heap_with_policy<GenCollectedHeap, ConcurrentMarkSweepPolicy>();
718 #endif
719 } else if (UseSerialGC) {
720 return Universe::create_heap_with_policy<GenCollectedHeap, MarkSweepPolicy>();
721 }
722
723 ShouldNotReachHere();
724 return NULL;
725 }
726
727 // Choose the heap base address and oop encoding mode
728 // when compressed oops are used:
729 // Unscaled - Use 32-bits oops without encoding when
730 // NarrowOopHeapBaseMin + heap_size < 4Gb
731 // ZeroBased - Use zero based compressed oops with encoding when
732 // NarrowOopHeapBaseMin + heap_size < 32Gb
733 // HeapBased - Use compressed oops with heap base + encoding.
734
735 jint Universe::initialize_heap() {
736 jint status = JNI_ERR;
737
738 _collectedHeap = create_heap_ext();
739 if (_collectedHeap == NULL) {
740 _collectedHeap = create_heap();
741 }
742
743 status = _collectedHeap->initialize();
744 if (status != JNI_OK) {
745 return status;
746 }
747
748 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
749
750 #ifdef _LP64
751 if (UseCompressedOops) {
752 // Subtract a page because something can get allocated at heap base.
753 // This also makes implicit null checking work, because the
754 // memory+1 page below heap_base needs to cause a signal.
755 // See needs_explicit_null_check.
756 // Only set the heap base for compressed oops because it indicates
757 // compressed oops for pstack code.
758 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) {
759 // Didn't reserve heap below 4Gb. Must shift.
760 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
761 }
762 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) {
763 // Did reserve heap below 32Gb. Can use base == 0;
764 Universe::set_narrow_oop_base(0);
765 }
766
767 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base());
768
769 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
770 Universe::print_compressed_oops_mode(tty);
771 }
772
773 // Tell tests in which mode we run.
774 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode",
775 narrow_oop_mode_to_string(narrow_oop_mode()),
776 false));
777 }
778 // Universe::narrow_oop_base() is one page below the heap.
779 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() -
780 os::vm_page_size()) ||
781 Universe::narrow_oop_base() == NULL, "invalid value");
782 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes ||
783 Universe::narrow_oop_shift() == 0, "invalid value");
784 #endif
785
786 // We will never reach the CATCH below since Exceptions::_throw will cause
787 // the VM to exit if an exception is thrown during initialization
788
789 if (UseTLAB) {
790 assert(Universe::heap()->supports_tlab_allocation(),
791 "Should support thread-local allocation buffers");
792 ThreadLocalAllocBuffer::startup_initialization();
793 }
794 return JNI_OK;
795 }
796
797 void Universe::print_compressed_oops_mode(outputStream* st) {
798 st->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
799 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M);
800
801 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode()));
802
803 if (Universe::narrow_oop_base() != 0) {
804 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base()));
805 }
806
807 if (Universe::narrow_oop_shift() != 0) {
808 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
809 }
810
811 if (!Universe::narrow_oop_use_implicit_null_checks()) {
812 st->print(", no protected page in front of the heap");
813 }
814 st->cr();
815 }
816
817 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
818
819 assert(alignment <= Arguments::conservative_max_heap_alignment(),
820 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
821 alignment, Arguments::conservative_max_heap_alignment());
822
823 size_t total_reserved = align_size_up(heap_size, alignment);
824 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
825 "heap size is too big for compressed oops");
826
827 bool use_large_pages = UseLargePages && is_size_aligned(alignment, os::large_page_size());
828 assert(!UseLargePages
829 || UseParallelGC
830 || use_large_pages, "Wrong alignment to use large pages");
831
832 // Now create the space.
833 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages);
834
835 if (total_rs.is_reserved()) {
836 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
837 "must be exactly of required size and alignment");
838 // We are good.
839
840 if (UseCompressedOops) {
841 // Universe::initialize_heap() will reset this to NULL if unscaled
842 // or zero-based narrow oops are actually used.
843 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
844 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
845 }
846
847 return total_rs;
848 }
849
850 vm_exit_during_initialization(
851 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
852 total_reserved/K));
853
854 // satisfy compiler
855 ShouldNotReachHere();
856 return ReservedHeapSpace(0, 0, false);
857 }
858
859
860 // It's the caller's responsibility to ensure glitch-freedom
861 // (if required).
862 void Universe::update_heap_info_at_gc() {
863 _heap_capacity_at_last_gc = heap()->capacity();
864 _heap_used_at_last_gc = heap()->used();
865 }
866
867
868 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) {
869 switch (mode) {
870 case UnscaledNarrowOop:
871 return "32-bit";
872 case ZeroBasedNarrowOop:
873 return "Zero based";
874 case DisjointBaseNarrowOop:
875 return "Non-zero disjoint base";
876 case HeapBasedNarrowOop:
877 return "Non-zero based";
878 }
879
880 ShouldNotReachHere();
881 return "";
882 }
883
884
885 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() {
886 if (narrow_oop_base_disjoint()) {
887 return DisjointBaseNarrowOop;
888 }
889
890 if (narrow_oop_base() != 0) {
891 return HeapBasedNarrowOop;
892 }
893
894 if (narrow_oop_shift() != 0) {
895 return ZeroBasedNarrowOop;
896 }
897
898 return UnscaledNarrowOop;
899 }
900
901
902 void universe2_init() {
903 EXCEPTION_MARK;
904 Universe::genesis(CATCH);
905 }
906
907
908 bool universe_post_init() {
909 assert(!is_init_completed(), "Error: initialization not yet completed!");
910 Universe::_fully_initialized = true;
911 EXCEPTION_MARK;
912 { ResourceMark rm;
913 Interpreter::initialize(); // needed for interpreter entry points
914 if (!UseSharedSpaces) {
915 HandleMark hm(THREAD);
916 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass());
917 Universe::reinitialize_vtable_of(ok_h, CHECK_false);
918 Universe::reinitialize_itables(CHECK_false);
919 }
920 }
921
922 HandleMark hm(THREAD);
923 Klass* k;
924 instanceKlassHandle k_h;
925 // Setup preallocated empty java.lang.Class array
926 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
927
928 // Setup preallocated OutOfMemoryError errors
929 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
930 k_h = instanceKlassHandle(THREAD, k);
931 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false);
932 Universe::_out_of_memory_error_metaspace = k_h->allocate_instance(CHECK_false);
933 Universe::_out_of_memory_error_class_metaspace = k_h->allocate_instance(CHECK_false);
934 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false);
935 Universe::_out_of_memory_error_gc_overhead_limit =
936 k_h->allocate_instance(CHECK_false);
937 Universe::_out_of_memory_error_realloc_objects = k_h->allocate_instance(CHECK_false);
938
939 // Setup preallocated cause message for delayed StackOverflowError
940 if (StackReservedPages > 0) {
941 Universe::_delayed_stack_overflow_error_message =
942 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
943 }
944
945 // Setup preallocated NullPointerException
946 // (this is currently used for a cheap & dirty solution in compiler exception handling)
947 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
948 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
949 // Setup preallocated ArithmeticException
950 // (this is currently used for a cheap & dirty solution in compiler exception handling)
951 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
952 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
953 // Virtual Machine Error for when we get into a situation we can't resolve
954 k = SystemDictionary::resolve_or_fail(
955 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
956 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
957 if (!linked) {
958 tty->print_cr("Unable to link/verify VirtualMachineError class");
959 return false; // initialization failed
960 }
961 Universe::_virtual_machine_error_instance =
962 InstanceKlass::cast(k)->allocate_instance(CHECK_false);
963
964 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
965
966 if (!DumpSharedSpaces) {
967 // These are the only Java fields that are currently set during shared space dumping.
968 // We prefer to not handle this generally, so we always reinitialize these detail messages.
969 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
970 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
971
972 msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
973 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
974 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
975 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
976
977 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
978 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
979
980 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
981 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
982
983 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false);
984 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg());
985
986 msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
987 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
988
989 // Setup the array of errors that have preallocated backtrace
990 k = Universe::_out_of_memory_error_java_heap->klass();
991 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
992 k_h = instanceKlassHandle(THREAD, k);
993
994 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
995 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false);
996 for (int i=0; i<len; i++) {
997 oop err = k_h->allocate_instance(CHECK_false);
998 Handle err_h = Handle(THREAD, err);
999 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
1000 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
1001 }
1002 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
1003 }
1004
1005
1006 // Setup static method for registering finalizers
1007 // The finalizer klass must be linked before looking up the method, in
1008 // case it needs to get rewritten.
1009 InstanceKlass::cast(SystemDictionary::Finalizer_klass())->link_class(CHECK_false);
1010 Method* m = InstanceKlass::cast(SystemDictionary::Finalizer_klass())->find_method(
1011 vmSymbols::register_method_name(),
1012 vmSymbols::register_method_signature());
1013 if (m == NULL || !m->is_static()) {
1014 tty->print_cr("Unable to link/verify Finalizer.register method");
1015 return false; // initialization failed (cannot throw exception yet)
1016 }
1017 Universe::_finalizer_register_cache->init(
1018 SystemDictionary::Finalizer_klass(), m);
1019
1020 InstanceKlass::cast(SystemDictionary::misc_Unsafe_klass())->link_class(CHECK_false);
1021 m = InstanceKlass::cast(SystemDictionary::misc_Unsafe_klass())->find_method(
1022 vmSymbols::throwIllegalAccessError_name(),
1023 vmSymbols::void_method_signature());
1024 if (m != NULL && !m->is_static()) {
1025 // Note null is okay; this method is used in itables, and if it is null,
1026 // then AbstractMethodError is thrown instead.
1027 tty->print_cr("Unable to link/verify Unsafe.throwIllegalAccessError method");
1028 return false; // initialization failed (cannot throw exception yet)
1029 }
1030 Universe::_throw_illegal_access_error_cache->init(
1031 SystemDictionary::misc_Unsafe_klass(), m);
1032
1033 // Setup method for registering loaded classes in class loader vector
1034 InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->link_class(CHECK_false);
1035 m = InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature());
1036 if (m == NULL || m->is_static()) {
1037 tty->print_cr("Unable to link/verify ClassLoader.addClass method");
1038 return false; // initialization failed (cannot throw exception yet)
1039 }
1040 Universe::_loader_addClass_cache->init(
1041 SystemDictionary::ClassLoader_klass(), m);
1042
1043 // Setup method for checking protection domain
1044 InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())->link_class(CHECK_false);
1045 m = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())->
1046 find_method(vmSymbols::impliesCreateAccessControlContext_name(),
1047 vmSymbols::void_boolean_signature());
1048 // Allow NULL which should only happen with bootstrapping.
1049 if (m != NULL) {
1050 if (m->is_static()) {
1051 // NoSuchMethodException doesn't actually work because it tries to run the
1052 // <init> function before java_lang_Class is linked. Print error and exit.
1053 tty->print_cr("ProtectionDomain.impliesCreateAccessControlContext() has the wrong linkage");
1054 return false; // initialization failed
1055 }
1056 Universe::_pd_implies_cache->init(
1057 SystemDictionary::ProtectionDomain_klass(), m);
1058 }
1059
1060 // This needs to be done before the first scavenge/gc, since
1061 // it's an input to soft ref clearing policy.
1062 {
1063 MutexLocker x(Heap_lock);
1064 Universe::update_heap_info_at_gc();
1065 }
1066
1067 // ("weak") refs processing infrastructure initialization
1068 Universe::heap()->post_initialize();
1069
1070 // Initialize performance counters for metaspaces
1071 MetaspaceCounters::initialize_performance_counters();
1072 CompressedClassSpaceCounters::initialize_performance_counters();
1073
1074 MemoryService::add_metaspace_memory_pools();
1075
1076 MemoryService::set_universe_heap(Universe::heap());
1077 #if INCLUDE_CDS
1078 SharedClassUtil::initialize(CHECK_false);
1079 #endif
1080 return true;
1081 }
1082
1083
1084 void Universe::compute_base_vtable_size() {
1085 _base_vtable_size = ClassLoader::compute_Object_vtable();
1086 }
1087
1088
1089 void Universe::print() {
1090 print_on(gclog_or_tty);
1091 }
1092
1093 void Universe::print_on(outputStream* st, bool extended) {
1094 st->print_cr("Heap");
1095 if (!extended) {
1096 heap()->print_on(st);
1097 } else {
1098 heap()->print_extended_on(st);
1099 }
1100 }
1101
1102 void Universe::print_heap_at_SIGBREAK() {
1103 if (PrintHeapAtSIGBREAK) {
1104 MutexLocker hl(Heap_lock);
1105 print_on(tty);
1106 tty->cr();
1107 tty->flush();
1108 }
1109 }
1110
1111 void Universe::print_heap_before_gc(outputStream* st, bool ignore_extended) {
1112 st->print_cr("{Heap before GC invocations=%u (full %u):",
1113 heap()->total_collections(),
1114 heap()->total_full_collections());
1115 if (!PrintHeapAtGCExtended || ignore_extended) {
1116 heap()->print_on(st);
1117 } else {
1118 heap()->print_extended_on(st);
1119 }
1120 }
1121
1122 void Universe::print_heap_after_gc(outputStream* st, bool ignore_extended) {
1123 st->print_cr("Heap after GC invocations=%u (full %u):",
1124 heap()->total_collections(),
1125 heap()->total_full_collections());
1126 if (!PrintHeapAtGCExtended || ignore_extended) {
1127 heap()->print_on(st);
1128 } else {
1129 heap()->print_extended_on(st);
1130 }
1131 st->print_cr("}");
1132 }
1133
1134 void Universe::verify(VerifyOption option, const char* prefix, bool silent) {
1135 // The use of _verify_in_progress is a temporary work around for
1136 // 6320749. Don't bother with a creating a class to set and clear
1137 // it since it is only used in this method and the control flow is
1138 // straight forward.
1139 _verify_in_progress = true;
1140
1141 COMPILER2_PRESENT(
1142 assert(!DerivedPointerTable::is_active(),
1143 "DPT should not be active during verification "
1144 "(of thread stacks below)");
1145 )
1146
1147 ResourceMark rm;
1148 HandleMark hm; // Handles created during verification can be zapped
1149 _verify_count++;
1150
1151 if (!silent) gclog_or_tty->print("%s", prefix);
1152 if (!silent) gclog_or_tty->print("[Verifying ");
1153 if (!silent) gclog_or_tty->print("threads ");
1154 Threads::verify();
1155 if (!silent) gclog_or_tty->print("heap ");
1156 heap()->verify(silent, option);
1157 if (!silent) gclog_or_tty->print("syms ");
1158 SymbolTable::verify();
1159 if (!silent) gclog_or_tty->print("strs ");
1160 StringTable::verify();
1161 {
1162 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1163 if (!silent) gclog_or_tty->print("zone ");
1164 CodeCache::verify();
1165 }
1166 if (!silent) gclog_or_tty->print("dict ");
1167 SystemDictionary::verify();
1168 #ifndef PRODUCT
1169 if (!silent) gclog_or_tty->print("cldg ");
1170 ClassLoaderDataGraph::verify();
1171 #endif
1172 if (!silent) gclog_or_tty->print("metaspace chunks ");
1173 MetaspaceAux::verify_free_chunks();
1174 if (!silent) gclog_or_tty->print("hand ");
1175 JNIHandles::verify();
1176 if (!silent) gclog_or_tty->print("C-heap ");
1177 os::check_heap();
1178 if (!silent) gclog_or_tty->print("code cache ");
1179 CodeCache::verify_oops();
1180 if (!silent) gclog_or_tty->print_cr("]");
1181
1182 _verify_in_progress = false;
1183 }
1184
1185
1186 #ifndef PRODUCT
1187 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1188 assert(low_boundary < high_boundary, "bad interval");
1189
1190 // decide which low-order bits we require to be clear:
1191 size_t alignSize = MinObjAlignmentInBytes;
1192 size_t min_object_size = CollectedHeap::min_fill_size();
1193
1194 // make an inclusive limit:
1195 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1196 uintptr_t min = (uintptr_t)low_boundary;
1197 assert(min < max, "bad interval");
1198 uintptr_t diff = max ^ min;
1199
1200 // throw away enough low-order bits to make the diff vanish
1201 uintptr_t mask = (uintptr_t)(-1);
1202 while ((mask & diff) != 0)
1203 mask <<= 1;
1204 uintptr_t bits = (min & mask);
1205 assert(bits == (max & mask), "correct mask");
1206 // check an intermediate value between min and max, just to make sure:
1207 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1208
1209 // require address alignment, too:
1210 mask |= (alignSize - 1);
1211
1212 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1213 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1214 }
1215 _verify_oop_mask = mask;
1216 _verify_oop_bits = bits;
1217 }
1218
1219 // Oop verification (see MacroAssembler::verify_oop)
1220
1221 uintptr_t Universe::verify_oop_mask() {
1222 MemRegion m = heap()->reserved_region();
1223 calculate_verify_data(m.start(), m.end());
1224 return _verify_oop_mask;
1225 }
1226
1227 uintptr_t Universe::verify_oop_bits() {
1228 MemRegion m = heap()->reserved_region();
1229 calculate_verify_data(m.start(), m.end());
1230 return _verify_oop_bits;
1231 }
1232
1233 uintptr_t Universe::verify_mark_mask() {
1234 return markOopDesc::lock_mask_in_place;
1235 }
1236
1237 uintptr_t Universe::verify_mark_bits() {
1238 intptr_t mask = verify_mark_mask();
1239 intptr_t bits = (intptr_t)markOopDesc::prototype();
1240 assert((bits & ~mask) == 0, "no stray header bits");
1241 return bits;
1242 }
1243 #endif // PRODUCT
1244
1245
1246 void Universe::compute_verify_oop_data() {
1247 verify_oop_mask();
1248 verify_oop_bits();
1249 verify_mark_mask();
1250 verify_mark_bits();
1251 }
1252
1253
1254 void LatestMethodCache::init(Klass* k, Method* m) {
1255 if (!UseSharedSpaces) {
1256 _klass = k;
1257 }
1258 #ifndef PRODUCT
1259 else {
1260 // sharing initilization should have already set up _klass
1261 assert(_klass != NULL, "just checking");
1262 }
1263 #endif
1264
1265 _method_idnum = m->method_idnum();
1266 assert(_method_idnum >= 0, "sanity check");
1267 }
1268
1269
1270 Method* LatestMethodCache::get_method() {
1271 if (klass() == NULL) return NULL;
1272 InstanceKlass* ik = InstanceKlass::cast(klass());
1273 Method* m = ik->method_with_idnum(method_idnum());
1274 assert(m != NULL, "sanity check");
1275 return m;
1276 }
1277
1278
1279 #ifdef ASSERT
1280 // Release dummy object(s) at bottom of heap
1281 bool Universe::release_fullgc_alot_dummy() {
1282 MutexLocker ml(FullGCALot_lock);
1283 if (_fullgc_alot_dummy_array != NULL) {
1284 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
1285 // No more dummies to release, release entire array instead
1286 _fullgc_alot_dummy_array = NULL;
1287 return false;
1288 }
1289 if (!UseConcMarkSweepGC) {
1290 // Release dummy at bottom of old generation
1291 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1292 }
1293 // Release dummy at bottom of permanent generation
1294 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1295 }
1296 return true;
1297 }
1298
1299 #endif // ASSERT