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/genRemSet.hpp"
39 #include "gc/shared/generation.hpp"
40 #include "gc/shared/space.hpp"
41 #include "interpreter/interpreter.hpp"
42 #include "memory/filemap.hpp"
43 #include "memory/metadataFactory.hpp"
44 #include "memory/metaspaceShared.hpp"
45 #include "memory/oopFactory.hpp"
46 #include "memory/universe.hpp"
47 #include "memory/universe.inline.hpp"
48 #include "oops/constantPool.hpp"
49 #include "oops/instanceClassLoaderKlass.hpp"
50 #include "oops/instanceKlass.hpp"
51 #include "oops/instanceMirrorKlass.hpp"
52 #include "oops/instanceRefKlass.hpp"
53 #include "oops/objArrayOop.inline.hpp"
54 #include "oops/oop.inline.hpp"
55 #include "oops/typeArrayKlass.hpp"
56 #include "prims/jvmtiRedefineClassesTrace.hpp"
57 #include "runtime/arguments.hpp"
58 #include "runtime/atomic.inline.hpp"
59 #include "runtime/commandLineFlagConstraintList.hpp"
60 #include "runtime/deoptimization.hpp"
61 #include "runtime/fprofiler.hpp"
62 #include "runtime/handles.inline.hpp"
63 #include "runtime/init.hpp"
64 #include "runtime/java.hpp"
65 #include "runtime/javaCalls.hpp"
66 #include "runtime/sharedRuntime.hpp"
67 #include "runtime/synchronizer.hpp"
68 #include "runtime/thread.inline.hpp"
69 #include "runtime/timer.hpp"
70 #include "runtime/vm_operations.hpp"
71 #include "services/memoryService.hpp"
72 #include "utilities/copy.hpp"
73 #include "utilities/events.hpp"
74 #include "utilities/hashtable.inline.hpp"
75 #include "utilities/macros.hpp"
76 #include "utilities/preserveException.hpp"
77 #if INCLUDE_ALL_GCS
78 #include "gc/cms/cmsCollectorPolicy.hpp"
79 #include "gc/g1/g1CollectedHeap.inline.hpp"
80 #include "gc/g1/g1CollectorPolicy.hpp"
81 #include "gc/parallel/parallelScavengeHeap.hpp"
82 #include "gc/shared/adaptiveSizePolicy.hpp"
83 #endif // INCLUDE_ALL_GCS
84 #if INCLUDE_CDS
85 #include "classfile/sharedClassUtil.hpp"
86 #endif
87
88 // Known objects
89 Klass* Universe::_boolArrayKlassObj = NULL;
90 Klass* Universe::_byteArrayKlassObj = NULL;
91 Klass* Universe::_charArrayKlassObj = NULL;
92 Klass* Universe::_intArrayKlassObj = NULL;
93 Klass* Universe::_shortArrayKlassObj = NULL;
94 Klass* Universe::_longArrayKlassObj = NULL;
95 Klass* Universe::_singleArrayKlassObj = NULL;
96 Klass* Universe::_doubleArrayKlassObj = NULL;
97 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ };
98 Klass* Universe::_objectArrayKlassObj = NULL;
99 oop Universe::_int_mirror = NULL;
100 oop Universe::_float_mirror = NULL;
101 oop Universe::_double_mirror = NULL;
102 oop Universe::_byte_mirror = NULL;
103 oop Universe::_bool_mirror = NULL;
104 oop Universe::_char_mirror = NULL;
105 oop Universe::_long_mirror = NULL;
106 oop Universe::_short_mirror = NULL;
107 oop Universe::_void_mirror = NULL;
108 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ };
109 oop Universe::_main_thread_group = NULL;
110 oop Universe::_system_thread_group = NULL;
111 objArrayOop Universe::_the_empty_class_klass_array = NULL;
112 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
113 oop Universe::_the_null_string = NULL;
114 oop Universe::_the_min_jint_string = NULL;
115 LatestMethodCache* Universe::_finalizer_register_cache = NULL;
116 LatestMethodCache* Universe::_loader_addClass_cache = NULL;
117 LatestMethodCache* Universe::_pd_implies_cache = NULL;
118 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL;
119 oop Universe::_out_of_memory_error_java_heap = NULL;
120 oop Universe::_out_of_memory_error_metaspace = NULL;
121 oop Universe::_out_of_memory_error_class_metaspace = NULL;
122 oop Universe::_out_of_memory_error_array_size = NULL;
123 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL;
124 oop Universe::_out_of_memory_error_realloc_objects = 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*)&_preallocated_out_of_memory_error_array);
201 f->do_oop((oop*)&_null_ptr_exception_instance);
202 f->do_oop((oop*)&_arithmetic_exception_instance);
203 f->do_oop((oop*)&_virtual_machine_error_instance);
204 f->do_oop((oop*)&_main_thread_group);
205 f->do_oop((oop*)&_system_thread_group);
206 f->do_oop((oop*)&_vm_exception);
207 f->do_oop((oop*)&_allocation_context_notification_obj);
208 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);)
209 }
210
211 // Serialize metadata in and out of CDS archive, not oops.
212 void Universe::serialize(SerializeClosure* f, bool do_all) {
213
214 f->do_ptr((void**)&_boolArrayKlassObj);
215 f->do_ptr((void**)&_byteArrayKlassObj);
216 f->do_ptr((void**)&_charArrayKlassObj);
217 f->do_ptr((void**)&_intArrayKlassObj);
218 f->do_ptr((void**)&_shortArrayKlassObj);
219 f->do_ptr((void**)&_longArrayKlassObj);
220 f->do_ptr((void**)&_singleArrayKlassObj);
221 f->do_ptr((void**)&_doubleArrayKlassObj);
222 f->do_ptr((void**)&_objectArrayKlassObj);
223
224 {
225 for (int i = 0; i < T_VOID+1; i++) {
226 if (_typeArrayKlassObjs[i] != NULL) {
227 assert(i >= T_BOOLEAN, "checking");
228 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
229 } else if (do_all) {
230 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
231 }
232 }
233 }
234
235 f->do_ptr((void**)&_the_array_interfaces_array);
236 f->do_ptr((void**)&_the_empty_int_array);
237 f->do_ptr((void**)&_the_empty_short_array);
238 f->do_ptr((void**)&_the_empty_method_array);
239 f->do_ptr((void**)&_the_empty_klass_array);
240 _finalizer_register_cache->serialize(f);
241 _loader_addClass_cache->serialize(f);
242 _pd_implies_cache->serialize(f);
243 _throw_illegal_access_error_cache->serialize(f);
244 }
245
246 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
247 if (size < alignment || size % alignment != 0) {
248 vm_exit_during_initialization(
249 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
250 }
251 }
252
253 void initialize_basic_type_klass(Klass* k, TRAPS) {
254 Klass* ok = SystemDictionary::Object_klass();
255 if (UseSharedSpaces) {
256 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
257 assert(k->super() == ok, "u3");
258 k->restore_unshareable_info(loader_data, Handle(), CHECK);
259 } else {
260 k->initialize_supers(ok, CHECK);
261 }
262 k->append_to_sibling_list();
263 }
264
265 void Universe::genesis(TRAPS) {
266 ResourceMark rm;
267
268 { FlagSetting fs(_bootstrapping, true);
269
270 { MutexLocker mc(Compile_lock);
271
272 // determine base vtable size; without that we cannot create the array klasses
273 compute_base_vtable_size();
274
275 if (!UseSharedSpaces) {
276 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK);
277 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK);
278 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK);
279 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK);
280 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK);
281 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK);
282 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK);
283 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK);
284
285 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj;
286 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj;
287 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj;
288 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj;
289 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj;
290 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj;
291 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj;
292 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj;
293
294 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
295
296 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
297 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
298 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
299 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
300 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
301 }
302 }
303
304 vmSymbols::initialize(CHECK);
305
306 SystemDictionary::initialize(CHECK);
307
308 Klass* ok = SystemDictionary::Object_klass();
309
310 _the_null_string = StringTable::intern("null", CHECK);
311 _the_min_jint_string = StringTable::intern("-2147483648", CHECK);
312
313 if (UseSharedSpaces) {
314 // Verify shared interfaces array.
315 assert(_the_array_interfaces_array->at(0) ==
316 SystemDictionary::Cloneable_klass(), "u3");
317 assert(_the_array_interfaces_array->at(1) ==
318 SystemDictionary::Serializable_klass(), "u3");
319 MetaspaceShared::fixup_shared_string_regions();
320 } else {
321 // Set up shared interfaces array. (Do this before supers are set up.)
322 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
323 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
324 }
325
326 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
327 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
328 initialize_basic_type_klass(singleArrayKlassObj(), CHECK);
329 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
330 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
331 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
332 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
333 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
334 } // end of core bootstrapping
335
336 // Maybe this could be lifted up now that object array can be initialized
337 // during the bootstrapping.
338
339 // OLD
340 // Initialize _objectArrayKlass after core bootstraping to make
341 // sure the super class is set up properly for _objectArrayKlass.
342 // ---
343 // NEW
344 // Since some of the old system object arrays have been converted to
345 // ordinary object arrays, _objectArrayKlass will be loaded when
346 // SystemDictionary::initialize(CHECK); is run. See the extra check
347 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
348 _objectArrayKlassObj = InstanceKlass::
349 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
350 // OLD
351 // Add the class to the class hierarchy manually to make sure that
352 // its vtable is initialized after core bootstrapping is completed.
353 // ---
354 // New
355 // Have already been initialized.
356 _objectArrayKlassObj->append_to_sibling_list();
357
358 // Compute is_jdk version flags.
359 // Only 1.3 or later has the java.lang.Shutdown class.
360 // Only 1.4 or later has the java.lang.CharSequence interface.
361 // Only 1.5 or later has the java.lang.management.MemoryUsage class.
362 if (JDK_Version::is_partially_initialized()) {
363 uint8_t jdk_version;
364 Klass* k = SystemDictionary::resolve_or_null(
365 vmSymbols::java_lang_management_MemoryUsage(), THREAD);
366 CLEAR_PENDING_EXCEPTION; // ignore exceptions
367 if (k == NULL) {
368 k = SystemDictionary::resolve_or_null(
369 vmSymbols::java_lang_CharSequence(), THREAD);
370 CLEAR_PENDING_EXCEPTION; // ignore exceptions
371 if (k == NULL) {
372 k = SystemDictionary::resolve_or_null(
373 vmSymbols::java_lang_Shutdown(), THREAD);
374 CLEAR_PENDING_EXCEPTION; // ignore exceptions
375 if (k == NULL) {
376 jdk_version = 2;
377 } else {
378 jdk_version = 3;
379 }
380 } else {
381 jdk_version = 4;
382 }
383 } else {
384 jdk_version = 5;
385 }
386 JDK_Version::fully_initialize(jdk_version);
387 }
388
389 #ifdef ASSERT
390 if (FullGCALot) {
391 // Allocate an array of dummy objects.
392 // We'd like these to be at the bottom of the old generation,
393 // so that when we free one and then collect,
394 // (almost) the whole heap moves
395 // and we find out if we actually update all the oops correctly.
396 // But we can't allocate directly in the old generation,
397 // so we allocate wherever, and hope that the first collection
398 // moves these objects to the bottom of the old generation.
399 // We can allocate directly in the permanent generation, so we do.
400 int size;
401 if (UseConcMarkSweepGC) {
402 warning("Using +FullGCALot with concurrent mark sweep gc "
403 "will not force all objects to relocate");
404 size = FullGCALotDummies;
405 } else {
406 size = FullGCALotDummies * 2;
407 }
408 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
409 objArrayHandle dummy_array(THREAD, naked_array);
410 int i = 0;
411 while (i < size) {
412 // Allocate dummy in old generation
413 oop dummy = InstanceKlass::cast(SystemDictionary::Object_klass())->allocate_instance(CHECK);
414 dummy_array->obj_at_put(i++, dummy);
415 }
416 {
417 // Only modify the global variable inside the mutex.
418 // If we had a race to here, the other dummy_array instances
419 // and their elements just get dropped on the floor, which is fine.
420 MutexLocker ml(FullGCALot_lock);
421 if (_fullgc_alot_dummy_array == NULL) {
422 _fullgc_alot_dummy_array = dummy_array();
423 }
424 }
425 assert(i == _fullgc_alot_dummy_array->length(), "just checking");
426 }
427 #endif
428
429 // Initialize dependency array for null class loader
430 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK);
431
432 }
433
434 // CDS support for patching vtables in metadata in the shared archive.
435 // All types inherited from Metadata have vtables, but not types inherited
436 // from MetaspaceObj, because the latter does not have virtual functions.
437 // If the metadata type has a vtable, it cannot be shared in the read-only
438 // section of the CDS archive, because the vtable pointer is patched.
439 static inline void add_vtable(void** list, int* n, void* o, int count) {
440 guarantee((*n) < count, "vtable list too small");
441 void* vtable = dereference_vptr(o);
442 assert(*(void**)(vtable) != NULL, "invalid vtable");
443 list[(*n)++] = vtable;
444 }
445
446 void Universe::init_self_patching_vtbl_list(void** list, int count) {
447 int n = 0;
448 { InstanceKlass o; add_vtable(list, &n, &o, count); }
449 { InstanceClassLoaderKlass o; add_vtable(list, &n, &o, count); }
450 { InstanceMirrorKlass o; add_vtable(list, &n, &o, count); }
451 { InstanceRefKlass o; add_vtable(list, &n, &o, count); }
452 { TypeArrayKlass o; add_vtable(list, &n, &o, count); }
453 { ObjArrayKlass o; add_vtable(list, &n, &o, count); }
454 { Method o; add_vtable(list, &n, &o, count); }
455 { ConstantPool o; add_vtable(list, &n, &o, count); }
456 }
457
458 void Universe::initialize_basic_type_mirrors(TRAPS) {
459 assert(_int_mirror==NULL, "basic type mirrors already initialized");
460 _int_mirror =
461 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK);
462 _float_mirror =
463 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK);
464 _double_mirror =
465 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK);
466 _byte_mirror =
467 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK);
468 _bool_mirror =
469 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
470 _char_mirror =
471 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK);
472 _long_mirror =
473 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK);
474 _short_mirror =
475 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK);
476 _void_mirror =
477 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK);
478
479 _mirrors[T_INT] = _int_mirror;
480 _mirrors[T_FLOAT] = _float_mirror;
481 _mirrors[T_DOUBLE] = _double_mirror;
482 _mirrors[T_BYTE] = _byte_mirror;
483 _mirrors[T_BOOLEAN] = _bool_mirror;
484 _mirrors[T_CHAR] = _char_mirror;
485 _mirrors[T_LONG] = _long_mirror;
486 _mirrors[T_SHORT] = _short_mirror;
487 _mirrors[T_VOID] = _void_mirror;
488 //_mirrors[T_OBJECT] = InstanceKlass::cast(_object_klass)->java_mirror();
489 //_mirrors[T_ARRAY] = InstanceKlass::cast(_object_klass)->java_mirror();
490 }
491
492 void Universe::fixup_mirrors(TRAPS) {
493 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
494 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
495 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
496 // that the number of objects allocated at this point is very small.
497 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
498 HandleMark hm(THREAD);
499 // Cache the start of the static fields
500 InstanceMirrorKlass::init_offset_of_static_fields();
501
502 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
503 int list_length = list->length();
504 for (int i = 0; i < list_length; i++) {
505 Klass* k = list->at(i);
506 assert(k->is_klass(), "List should only hold classes");
507 EXCEPTION_MARK;
508 KlassHandle kh(THREAD, k);
509 java_lang_Class::fixup_mirror(kh, CATCH);
510 }
511 delete java_lang_Class::fixup_mirror_list();
512 java_lang_Class::set_fixup_mirror_list(NULL);
513 }
514
515 static bool has_run_finalizers_on_exit = false;
516
517 void Universe::run_finalizers_on_exit() {
518 if (has_run_finalizers_on_exit) return;
519 has_run_finalizers_on_exit = true;
520
521 // Called on VM exit. This ought to be run in a separate thread.
522 if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit");
523 {
524 PRESERVE_EXCEPTION_MARK;
525 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass());
526 JavaValue result(T_VOID);
527 JavaCalls::call_static(
528 &result,
529 finalizer_klass,
530 vmSymbols::run_finalizers_on_exit_name(),
531 vmSymbols::void_method_signature(),
532 THREAD
533 );
534 // Ignore any pending exceptions
535 CLEAR_PENDING_EXCEPTION;
536 }
537 }
538
539
540 // initialize_vtable could cause gc if
541 // 1) we specified true to initialize_vtable and
542 // 2) this ran after gc was enabled
543 // In case those ever change we use handles for oops
544 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) {
545 // init vtable of k and all subclasses
546 Klass* ko = k_h();
547 klassVtable* vt = ko->vtable();
548 if (vt) vt->initialize_vtable(false, CHECK);
549 if (ko->oop_is_instance()) {
550 InstanceKlass* ik = (InstanceKlass*)ko;
551 for (KlassHandle s_h(THREAD, ik->subklass());
552 s_h() != NULL;
553 s_h = KlassHandle(THREAD, s_h()->next_sibling())) {
554 reinitialize_vtable_of(s_h, CHECK);
555 }
556 }
557 }
558
559
560 void initialize_itable_for_klass(Klass* k, TRAPS) {
561 InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK);
562 }
563
564
565 void Universe::reinitialize_itables(TRAPS) {
566 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK);
567
568 }
569
570
571 bool Universe::on_page_boundary(void* addr) {
572 return ((uintptr_t) addr) % os::vm_page_size() == 0;
573 }
574
575
576 bool Universe::should_fill_in_stack_trace(Handle throwable) {
577 // never attempt to fill in the stack trace of preallocated errors that do not have
578 // backtrace. These errors are kept alive forever and may be "re-used" when all
579 // preallocated errors with backtrace have been consumed. Also need to avoid
580 // a potential loop which could happen if an out of memory occurs when attempting
581 // to allocate the backtrace.
582 return ((throwable() != Universe::_out_of_memory_error_java_heap) &&
583 (throwable() != Universe::_out_of_memory_error_metaspace) &&
584 (throwable() != Universe::_out_of_memory_error_class_metaspace) &&
585 (throwable() != Universe::_out_of_memory_error_array_size) &&
586 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) &&
587 (throwable() != Universe::_out_of_memory_error_realloc_objects));
588 }
589
590
591 oop Universe::gen_out_of_memory_error(oop default_err) {
592 // generate an out of memory error:
593 // - if there is a preallocated error with backtrace available then return it wth
594 // a filled in stack trace.
595 // - if there are no preallocated errors with backtrace available then return
596 // an error without backtrace.
597 int next;
598 if (_preallocated_out_of_memory_error_avail_count > 0) {
599 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);
600 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
601 } else {
602 next = -1;
603 }
604 if (next < 0) {
605 // all preallocated errors have been used.
606 // return default
607 return default_err;
608 } else {
609 // get the error object at the slot and set set it to NULL so that the
610 // array isn't keeping it alive anymore.
611 oop exc = preallocated_out_of_memory_errors()->obj_at(next);
612 assert(exc != NULL, "slot has been used already");
613 preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
614
615 // use the message from the default error
616 oop msg = java_lang_Throwable::message(default_err);
617 assert(msg != NULL, "no message");
618 java_lang_Throwable::set_message(exc, msg);
619
620 // populate the stack trace and return it.
621 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
622 return exc;
623 }
624 }
625
626 intptr_t Universe::_non_oop_bits = 0;
627
628 void* Universe::non_oop_word() {
629 // Neither the high bits nor the low bits of this value is allowed
630 // to look like (respectively) the high or low bits of a real oop.
631 //
632 // High and low are CPU-specific notions, but low always includes
633 // the low-order bit. Since oops are always aligned at least mod 4,
634 // setting the low-order bit will ensure that the low half of the
635 // word will never look like that of a real oop.
636 //
637 // Using the OS-supplied non-memory-address word (usually 0 or -1)
638 // will take care of the high bits, however many there are.
639
640 if (_non_oop_bits == 0) {
641 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
642 }
643
644 return (void*)_non_oop_bits;
645 }
646
647 jint universe_init() {
648 assert(!Universe::_fully_initialized, "called after initialize_vtables");
649 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
650 "LogHeapWordSize is incorrect.");
651 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
652 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
653 "oop size is not not a multiple of HeapWord size");
654 TraceTime timer("Genesis", TraceStartupTime);
655 JavaClasses::compute_hard_coded_offsets();
656
657 jint status = Universe::initialize_heap();
658 if (status != JNI_OK) {
659 return status;
660 }
661
662 Metaspace::global_initialize();
663
664 // Checks 'AfterMemoryInit' constraints.
665 if (!CommandLineFlagConstraintList::check_constraints(CommandLineFlagConstraint::AfterMemoryInit)) {
666 return JNI_EINVAL;
667 }
668
669 // Create memory for metadata. Must be after initializing heap for
670 // DumpSharedSpaces.
671 ClassLoaderData::init_null_class_loader_data();
672
673 // We have a heap so create the Method* caches before
674 // Metaspace::initialize_shared_spaces() tries to populate them.
675 Universe::_finalizer_register_cache = new LatestMethodCache();
676 Universe::_loader_addClass_cache = new LatestMethodCache();
677 Universe::_pd_implies_cache = new LatestMethodCache();
678 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
679
680 if (UseSharedSpaces) {
681 // Read the data structures supporting the shared spaces (shared
682 // system dictionary, symbol table, etc.). After that, access to
683 // the file (other than the mapped regions) is no longer needed, and
684 // the file is closed. Closing the file does not affect the
685 // currently mapped regions.
686 MetaspaceShared::initialize_shared_spaces();
687 StringTable::create_table();
688 } else {
689 SymbolTable::create_table();
690 StringTable::create_table();
691 ClassLoader::create_package_info_table();
692
693 if (DumpSharedSpaces) {
694 MetaspaceShared::prepare_for_dumping();
695 }
696 }
697
698 return JNI_OK;
699 }
700
701 CollectedHeap* Universe::create_heap() {
702 assert(_collectedHeap == NULL, "Heap already created");
703 #if !INCLUDE_ALL_GCS
704 if (UseParallelGC) {
705 fatal("UseParallelGC not supported in this VM.");
706 } else if (UseG1GC) {
707 fatal("UseG1GC not supported in this VM.");
708 } else if (UseConcMarkSweepGC) {
709 fatal("UseConcMarkSweepGC not supported in this VM.");
710 #else
711 if (UseParallelGC) {
712 return Universe::create_heap_with_policy<ParallelScavengeHeap, GenerationSizer>();
713 } else if (UseG1GC) {
714 return Universe::create_heap_with_policy<G1CollectedHeap, G1CollectorPolicy>();
715 } else if (UseConcMarkSweepGC) {
716 return Universe::create_heap_with_policy<GenCollectedHeap, ConcurrentMarkSweepPolicy>();
717 #endif
718 } else if (UseSerialGC) {
719 return Universe::create_heap_with_policy<GenCollectedHeap, MarkSweepPolicy>();
720 }
721
722 ShouldNotReachHere();
723 return NULL;
724 }
725
726 // Choose the heap base address and oop encoding mode
727 // when compressed oops are used:
728 // Unscaled - Use 32-bits oops without encoding when
729 // NarrowOopHeapBaseMin + heap_size < 4Gb
730 // ZeroBased - Use zero based compressed oops with encoding when
731 // NarrowOopHeapBaseMin + heap_size < 32Gb
732 // HeapBased - Use compressed oops with heap base + encoding.
733
734 jint Universe::initialize_heap() {
735 jint status = JNI_ERR;
736
737 _collectedHeap = create_heap_ext();
738 if (_collectedHeap == NULL) {
739 _collectedHeap = create_heap();
740 }
741
742 status = _collectedHeap->initialize();
743 if (status != JNI_OK) {
744 return status;
745 }
746
747 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
748
749 #ifdef _LP64
750 if (UseCompressedOops) {
751 // Subtract a page because something can get allocated at heap base.
752 // This also makes implicit null checking work, because the
753 // memory+1 page below heap_base needs to cause a signal.
754 // See needs_explicit_null_check.
755 // Only set the heap base for compressed oops because it indicates
756 // compressed oops for pstack code.
757 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) {
758 // Didn't reserve heap below 4Gb. Must shift.
759 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
760 }
761 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) {
762 // Did reserve heap below 32Gb. Can use base == 0;
763 Universe::set_narrow_oop_base(0);
764 }
765
766 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base());
767
768 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
769 Universe::print_compressed_oops_mode(tty);
770 }
771
772 // Tell tests in which mode we run.
773 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode",
774 narrow_oop_mode_to_string(narrow_oop_mode()),
775 false));
776 }
777 // Universe::narrow_oop_base() is one page below the heap.
778 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() -
779 os::vm_page_size()) ||
780 Universe::narrow_oop_base() == NULL, "invalid value");
781 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes ||
782 Universe::narrow_oop_shift() == 0, "invalid value");
783 #endif
784
785 // We will never reach the CATCH below since Exceptions::_throw will cause
786 // the VM to exit if an exception is thrown during initialization
787
788 if (UseTLAB) {
789 assert(Universe::heap()->supports_tlab_allocation(),
790 "Should support thread-local allocation buffers");
791 ThreadLocalAllocBuffer::startup_initialization();
792 }
793 return JNI_OK;
794 }
795
796 void Universe::print_compressed_oops_mode(outputStream* st) {
797 st->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
798 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M);
799
800 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode()));
801
802 if (Universe::narrow_oop_base() != 0) {
803 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base()));
804 }
805
806 if (Universe::narrow_oop_shift() != 0) {
807 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
808 }
809
810 if (!Universe::narrow_oop_use_implicit_null_checks()) {
811 st->print(", no protected page in front of the heap");
812 }
813 st->cr();
814 }
815
816 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
817
818 assert(alignment <= Arguments::conservative_max_heap_alignment(),
819 err_msg("actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
820 alignment, Arguments::conservative_max_heap_alignment()));
821
822 size_t total_reserved = align_size_up(heap_size, alignment);
823 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
824 "heap size is too big for compressed oops");
825
826 bool use_large_pages = UseLargePages && is_size_aligned(alignment, os::large_page_size());
827 assert(!UseLargePages
828 || UseParallelGC
829 || use_large_pages, "Wrong alignment to use large pages");
830
831 // Now create the space.
832 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages);
833
834 if (total_rs.is_reserved()) {
835 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
836 "must be exactly of required size and alignment");
837 // We are good.
838
839 if (UseCompressedOops) {
840 // Universe::initialize_heap() will reset this to NULL if unscaled
841 // or zero-based narrow oops are actually used.
842 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
843 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
844 }
845
846 return total_rs;
847 }
848
849 vm_exit_during_initialization(
850 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
851 total_reserved/K));
852
853 // satisfy compiler
854 ShouldNotReachHere();
855 return ReservedHeapSpace(0, 0, false);
856 }
857
858
859 // It's the caller's responsibility to ensure glitch-freedom
860 // (if required).
861 void Universe::update_heap_info_at_gc() {
862 _heap_capacity_at_last_gc = heap()->capacity();
863 _heap_used_at_last_gc = heap()->used();
864 }
865
866
867 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) {
868 switch (mode) {
869 case UnscaledNarrowOop:
870 return "32-bit";
871 case ZeroBasedNarrowOop:
872 return "Zero based";
873 case DisjointBaseNarrowOop:
874 return "Non-zero disjoint base";
875 case HeapBasedNarrowOop:
876 return "Non-zero based";
877 }
878
879 ShouldNotReachHere();
880 return "";
881 }
882
883
884 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() {
885 if (narrow_oop_base_disjoint()) {
886 return DisjointBaseNarrowOop;
887 }
888
889 if (narrow_oop_base() != 0) {
890 return HeapBasedNarrowOop;
891 }
892
893 if (narrow_oop_shift() != 0) {
894 return ZeroBasedNarrowOop;
895 }
896
897 return UnscaledNarrowOop;
898 }
899
900
901 void universe2_init() {
902 EXCEPTION_MARK;
903 Universe::genesis(CATCH);
904 }
905
906
907 bool universe_post_init() {
908 assert(!is_init_completed(), "Error: initialization not yet completed!");
909 Universe::_fully_initialized = true;
910 EXCEPTION_MARK;
911 { ResourceMark rm;
912 Interpreter::initialize(); // needed for interpreter entry points
913 if (!UseSharedSpaces) {
914 HandleMark hm(THREAD);
915 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass());
916 Universe::reinitialize_vtable_of(ok_h, CHECK_false);
917 Universe::reinitialize_itables(CHECK_false);
918 }
919 }
920
921 HandleMark hm(THREAD);
922 Klass* k;
923 instanceKlassHandle k_h;
924 // Setup preallocated empty java.lang.Class array
925 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
926
927 // Setup preallocated OutOfMemoryError errors
928 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
929 k_h = instanceKlassHandle(THREAD, k);
930 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false);
931 Universe::_out_of_memory_error_metaspace = k_h->allocate_instance(CHECK_false);
932 Universe::_out_of_memory_error_class_metaspace = k_h->allocate_instance(CHECK_false);
933 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false);
934 Universe::_out_of_memory_error_gc_overhead_limit =
935 k_h->allocate_instance(CHECK_false);
936 Universe::_out_of_memory_error_realloc_objects = k_h->allocate_instance(CHECK_false);
937
938 // Setup preallocated NullPointerException
939 // (this is currently used for a cheap & dirty solution in compiler exception handling)
940 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
941 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
942 // Setup preallocated ArithmeticException
943 // (this is currently used for a cheap & dirty solution in compiler exception handling)
944 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
945 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
946 // Virtual Machine Error for when we get into a situation we can't resolve
947 k = SystemDictionary::resolve_or_fail(
948 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
949 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
950 if (!linked) {
951 tty->print_cr("Unable to link/verify VirtualMachineError class");
952 return false; // initialization failed
953 }
954 Universe::_virtual_machine_error_instance =
955 InstanceKlass::cast(k)->allocate_instance(CHECK_false);
956
957 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
958
959 if (!DumpSharedSpaces) {
960 // These are the only Java fields that are currently set during shared space dumping.
961 // We prefer to not handle this generally, so we always reinitialize these detail messages.
962 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
963 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
964
965 msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
966 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
967 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
968 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
969
970 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
971 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
972
973 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
974 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
975
976 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false);
977 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg());
978
979 msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
980 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
981
982 // Setup the array of errors that have preallocated backtrace
983 k = Universe::_out_of_memory_error_java_heap->klass();
984 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
985 k_h = instanceKlassHandle(THREAD, k);
986
987 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
988 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false);
989 for (int i=0; i<len; i++) {
990 oop err = k_h->allocate_instance(CHECK_false);
991 Handle err_h = Handle(THREAD, err);
992 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
993 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
994 }
995 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
996 }
997
998
999 // Setup static method for registering finalizers
1000 // The finalizer klass must be linked before looking up the method, in
1001 // case it needs to get rewritten.
1002 InstanceKlass::cast(SystemDictionary::Finalizer_klass())->link_class(CHECK_false);
1003 Method* m = InstanceKlass::cast(SystemDictionary::Finalizer_klass())->find_method(
1004 vmSymbols::register_method_name(),
1005 vmSymbols::register_method_signature());
1006 if (m == NULL || !m->is_static()) {
1007 tty->print_cr("Unable to link/verify Finalizer.register method");
1008 return false; // initialization failed (cannot throw exception yet)
1009 }
1010 Universe::_finalizer_register_cache->init(
1011 SystemDictionary::Finalizer_klass(), m);
1012
1013 InstanceKlass::cast(SystemDictionary::misc_Unsafe_klass())->link_class(CHECK_false);
1014 m = InstanceKlass::cast(SystemDictionary::misc_Unsafe_klass())->find_method(
1015 vmSymbols::throwIllegalAccessError_name(),
1016 vmSymbols::void_method_signature());
1017 if (m != NULL && !m->is_static()) {
1018 // Note null is okay; this method is used in itables, and if it is null,
1019 // then AbstractMethodError is thrown instead.
1020 tty->print_cr("Unable to link/verify Unsafe.throwIllegalAccessError method");
1021 return false; // initialization failed (cannot throw exception yet)
1022 }
1023 Universe::_throw_illegal_access_error_cache->init(
1024 SystemDictionary::misc_Unsafe_klass(), m);
1025
1026 // Setup method for registering loaded classes in class loader vector
1027 InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->link_class(CHECK_false);
1028 m = InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature());
1029 if (m == NULL || m->is_static()) {
1030 tty->print_cr("Unable to link/verify ClassLoader.addClass method");
1031 return false; // initialization failed (cannot throw exception yet)
1032 }
1033 Universe::_loader_addClass_cache->init(
1034 SystemDictionary::ClassLoader_klass(), m);
1035
1036 // Setup method for checking protection domain
1037 InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())->link_class(CHECK_false);
1038 m = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())->
1039 find_method(vmSymbols::impliesCreateAccessControlContext_name(),
1040 vmSymbols::void_boolean_signature());
1041 // Allow NULL which should only happen with bootstrapping.
1042 if (m != NULL) {
1043 if (m->is_static()) {
1044 // NoSuchMethodException doesn't actually work because it tries to run the
1045 // <init> function before java_lang_Class is linked. Print error and exit.
1046 tty->print_cr("ProtectionDomain.impliesCreateAccessControlContext() has the wrong linkage");
1047 return false; // initialization failed
1048 }
1049 Universe::_pd_implies_cache->init(
1050 SystemDictionary::ProtectionDomain_klass(), m);
1051 }
1052
1053 // This needs to be done before the first scavenge/gc, since
1054 // it's an input to soft ref clearing policy.
1055 {
1056 MutexLocker x(Heap_lock);
1057 Universe::update_heap_info_at_gc();
1058 }
1059
1060 // ("weak") refs processing infrastructure initialization
1061 Universe::heap()->post_initialize();
1062
1063 // Initialize performance counters for metaspaces
1064 MetaspaceCounters::initialize_performance_counters();
1065 CompressedClassSpaceCounters::initialize_performance_counters();
1066
1067 MemoryService::add_metaspace_memory_pools();
1068
1069 MemoryService::set_universe_heap(Universe::heap());
1070 #if INCLUDE_CDS
1071 SharedClassUtil::initialize(CHECK_false);
1072 #endif
1073 return true;
1074 }
1075
1076
1077 void Universe::compute_base_vtable_size() {
1078 _base_vtable_size = ClassLoader::compute_Object_vtable();
1079 }
1080
1081
1082 void Universe::print() {
1083 print_on(gclog_or_tty);
1084 }
1085
1086 void Universe::print_on(outputStream* st, bool extended) {
1087 st->print_cr("Heap");
1088 if (!extended) {
1089 heap()->print_on(st);
1090 } else {
1091 heap()->print_extended_on(st);
1092 }
1093 }
1094
1095 void Universe::print_heap_at_SIGBREAK() {
1096 if (PrintHeapAtSIGBREAK) {
1097 MutexLocker hl(Heap_lock);
1098 print_on(tty);
1099 tty->cr();
1100 tty->flush();
1101 }
1102 }
1103
1104 void Universe::print_heap_before_gc(outputStream* st, bool ignore_extended) {
1105 st->print_cr("{Heap before GC invocations=%u (full %u):",
1106 heap()->total_collections(),
1107 heap()->total_full_collections());
1108 if (!PrintHeapAtGCExtended || ignore_extended) {
1109 heap()->print_on(st);
1110 } else {
1111 heap()->print_extended_on(st);
1112 }
1113 }
1114
1115 void Universe::print_heap_after_gc(outputStream* st, bool ignore_extended) {
1116 st->print_cr("Heap after GC invocations=%u (full %u):",
1117 heap()->total_collections(),
1118 heap()->total_full_collections());
1119 if (!PrintHeapAtGCExtended || ignore_extended) {
1120 heap()->print_on(st);
1121 } else {
1122 heap()->print_extended_on(st);
1123 }
1124 st->print_cr("}");
1125 }
1126
1127 void Universe::verify(VerifyOption option, const char* prefix, bool silent) {
1128 // The use of _verify_in_progress is a temporary work around for
1129 // 6320749. Don't bother with a creating a class to set and clear
1130 // it since it is only used in this method and the control flow is
1131 // straight forward.
1132 _verify_in_progress = true;
1133
1134 COMPILER2_PRESENT(
1135 assert(!DerivedPointerTable::is_active(),
1136 "DPT should not be active during verification "
1137 "(of thread stacks below)");
1138 )
1139
1140 ResourceMark rm;
1141 HandleMark hm; // Handles created during verification can be zapped
1142 _verify_count++;
1143
1144 if (!silent) gclog_or_tty->print("%s", prefix);
1145 if (!silent) gclog_or_tty->print("[Verifying ");
1146 if (!silent) gclog_or_tty->print("threads ");
1147 Threads::verify();
1148 if (!silent) gclog_or_tty->print("heap ");
1149 heap()->verify(silent, option);
1150 if (!silent) gclog_or_tty->print("syms ");
1151 SymbolTable::verify();
1152 if (!silent) gclog_or_tty->print("strs ");
1153 StringTable::verify();
1154 {
1155 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1156 if (!silent) gclog_or_tty->print("zone ");
1157 CodeCache::verify();
1158 }
1159 if (!silent) gclog_or_tty->print("dict ");
1160 SystemDictionary::verify();
1161 #ifndef PRODUCT
1162 if (!silent) gclog_or_tty->print("cldg ");
1163 ClassLoaderDataGraph::verify();
1164 #endif
1165 if (!silent) gclog_or_tty->print("metaspace chunks ");
1166 MetaspaceAux::verify_free_chunks();
1167 if (!silent) gclog_or_tty->print("hand ");
1168 JNIHandles::verify();
1169 if (!silent) gclog_or_tty->print("C-heap ");
1170 os::check_heap();
1171 if (!silent) gclog_or_tty->print("code cache ");
1172 CodeCache::verify_oops();
1173 if (!silent) gclog_or_tty->print_cr("]");
1174
1175 _verify_in_progress = false;
1176 }
1177
1178
1179 #ifndef PRODUCT
1180 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1181 assert(low_boundary < high_boundary, "bad interval");
1182
1183 // decide which low-order bits we require to be clear:
1184 size_t alignSize = MinObjAlignmentInBytes;
1185 size_t min_object_size = CollectedHeap::min_fill_size();
1186
1187 // make an inclusive limit:
1188 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1189 uintptr_t min = (uintptr_t)low_boundary;
1190 assert(min < max, "bad interval");
1191 uintptr_t diff = max ^ min;
1192
1193 // throw away enough low-order bits to make the diff vanish
1194 uintptr_t mask = (uintptr_t)(-1);
1195 while ((mask & diff) != 0)
1196 mask <<= 1;
1197 uintptr_t bits = (min & mask);
1198 assert(bits == (max & mask), "correct mask");
1199 // check an intermediate value between min and max, just to make sure:
1200 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1201
1202 // require address alignment, too:
1203 mask |= (alignSize - 1);
1204
1205 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1206 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1207 }
1208 _verify_oop_mask = mask;
1209 _verify_oop_bits = bits;
1210 }
1211
1212 // Oop verification (see MacroAssembler::verify_oop)
1213
1214 uintptr_t Universe::verify_oop_mask() {
1215 MemRegion m = heap()->reserved_region();
1216 calculate_verify_data(m.start(), m.end());
1217 return _verify_oop_mask;
1218 }
1219
1220 uintptr_t Universe::verify_oop_bits() {
1221 MemRegion m = heap()->reserved_region();
1222 calculate_verify_data(m.start(), m.end());
1223 return _verify_oop_bits;
1224 }
1225
1226 uintptr_t Universe::verify_mark_mask() {
1227 return markOopDesc::lock_mask_in_place;
1228 }
1229
1230 uintptr_t Universe::verify_mark_bits() {
1231 intptr_t mask = verify_mark_mask();
1232 intptr_t bits = (intptr_t)markOopDesc::prototype();
1233 assert((bits & ~mask) == 0, "no stray header bits");
1234 return bits;
1235 }
1236 #endif // PRODUCT
1237
1238
1239 void Universe::compute_verify_oop_data() {
1240 verify_oop_mask();
1241 verify_oop_bits();
1242 verify_mark_mask();
1243 verify_mark_bits();
1244 }
1245
1246
1247 void LatestMethodCache::init(Klass* k, Method* m) {
1248 if (!UseSharedSpaces) {
1249 _klass = k;
1250 }
1251 #ifndef PRODUCT
1252 else {
1253 // sharing initilization should have already set up _klass
1254 assert(_klass != NULL, "just checking");
1255 }
1256 #endif
1257
1258 _method_idnum = m->method_idnum();
1259 assert(_method_idnum >= 0, "sanity check");
1260 }
1261
1262
1263 Method* LatestMethodCache::get_method() {
1264 if (klass() == NULL) return NULL;
1265 InstanceKlass* ik = InstanceKlass::cast(klass());
1266 Method* m = ik->method_with_idnum(method_idnum());
1267 assert(m != NULL, "sanity check");
1268 return m;
1269 }
1270
1271
1272 #ifdef ASSERT
1273 // Release dummy object(s) at bottom of heap
1274 bool Universe::release_fullgc_alot_dummy() {
1275 MutexLocker ml(FullGCALot_lock);
1276 if (_fullgc_alot_dummy_array != NULL) {
1277 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
1278 // No more dummies to release, release entire array instead
1279 _fullgc_alot_dummy_array = NULL;
1280 return false;
1281 }
1282 if (!UseConcMarkSweepGC) {
1283 // Release dummy at bottom of old generation
1284 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1285 }
1286 // Release dummy at bottom of permanent generation
1287 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1288 }
1289 return true;
1290 }
1291
1292 #endif // ASSERT