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