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.inline.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 LatestMethodCache* Universe::_do_stack_walk_cache = NULL;
122 oop Universe::_out_of_memory_error_java_heap = NULL;
123 oop Universe::_out_of_memory_error_metaspace = NULL;
124 oop Universe::_out_of_memory_error_class_metaspace = NULL;
125 oop Universe::_out_of_memory_error_array_size = NULL;
126 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL;
127 oop Universe::_out_of_memory_error_realloc_objects = NULL;
128 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL;
129 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
130 bool Universe::_verify_in_progress = false;
131 oop Universe::_null_ptr_exception_instance = NULL;
132 oop Universe::_arithmetic_exception_instance = NULL;
133 oop Universe::_virtual_machine_error_instance = NULL;
134 oop Universe::_vm_exception = NULL;
135 oop Universe::_allocation_context_notification_obj = NULL;
136
137 Array<int>* Universe::_the_empty_int_array = NULL;
138 Array<u2>* Universe::_the_empty_short_array = NULL;
139 Array<Klass*>* Universe::_the_empty_klass_array = NULL;
140 Array<Method*>* Universe::_the_empty_method_array = NULL;
141
142 // These variables are guarded by FullGCALot_lock.
143 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;)
144 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
145
146 // Heap
147 int Universe::_verify_count = 0;
148
149 // Oop verification (see MacroAssembler::verify_oop)
150 uintptr_t Universe::_verify_oop_mask = 0;
151 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
152
153 int Universe::_base_vtable_size = 0;
154 bool Universe::_bootstrapping = false;
155 bool Universe::_fully_initialized = false;
156
157 size_t Universe::_heap_capacity_at_last_gc;
158 size_t Universe::_heap_used_at_last_gc = 0;
159
160 CollectedHeap* Universe::_collectedHeap = NULL;
161
162 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true };
163 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true };
164 address Universe::_narrow_ptrs_base;
165
166 void Universe::basic_type_classes_do(void f(Klass*)) {
167 f(boolArrayKlassObj());
168 f(byteArrayKlassObj());
169 f(charArrayKlassObj());
170 f(intArrayKlassObj());
171 f(shortArrayKlassObj());
172 f(longArrayKlassObj());
173 f(singleArrayKlassObj());
174 f(doubleArrayKlassObj());
175 }
176
177 void Universe::oops_do(OopClosure* f, bool do_all) {
178
179 f->do_oop((oop*) &_int_mirror);
180 f->do_oop((oop*) &_float_mirror);
181 f->do_oop((oop*) &_double_mirror);
182 f->do_oop((oop*) &_byte_mirror);
183 f->do_oop((oop*) &_bool_mirror);
184 f->do_oop((oop*) &_char_mirror);
185 f->do_oop((oop*) &_long_mirror);
186 f->do_oop((oop*) &_short_mirror);
187 f->do_oop((oop*) &_void_mirror);
188
189 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
190 f->do_oop((oop*) &_mirrors[i]);
191 }
192 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
193
194 f->do_oop((oop*)&_the_empty_class_klass_array);
195 f->do_oop((oop*)&_the_null_string);
196 f->do_oop((oop*)&_the_min_jint_string);
197 f->do_oop((oop*)&_out_of_memory_error_java_heap);
198 f->do_oop((oop*)&_out_of_memory_error_metaspace);
199 f->do_oop((oop*)&_out_of_memory_error_class_metaspace);
200 f->do_oop((oop*)&_out_of_memory_error_array_size);
201 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit);
202 f->do_oop((oop*)&_out_of_memory_error_realloc_objects);
203 f->do_oop((oop*)&_preallocated_out_of_memory_error_array);
204 f->do_oop((oop*)&_null_ptr_exception_instance);
205 f->do_oop((oop*)&_arithmetic_exception_instance);
206 f->do_oop((oop*)&_virtual_machine_error_instance);
207 f->do_oop((oop*)&_main_thread_group);
208 f->do_oop((oop*)&_system_thread_group);
209 f->do_oop((oop*)&_vm_exception);
210 f->do_oop((oop*)&_allocation_context_notification_obj);
211 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);)
212 }
213
214 // Serialize metadata in and out of CDS archive, not oops.
215 void Universe::serialize(SerializeClosure* f, bool do_all) {
216
217 f->do_ptr((void**)&_boolArrayKlassObj);
218 f->do_ptr((void**)&_byteArrayKlassObj);
219 f->do_ptr((void**)&_charArrayKlassObj);
220 f->do_ptr((void**)&_intArrayKlassObj);
221 f->do_ptr((void**)&_shortArrayKlassObj);
222 f->do_ptr((void**)&_longArrayKlassObj);
223 f->do_ptr((void**)&_singleArrayKlassObj);
224 f->do_ptr((void**)&_doubleArrayKlassObj);
225 f->do_ptr((void**)&_objectArrayKlassObj);
226
227 {
228 for (int i = 0; i < T_VOID+1; i++) {
229 if (_typeArrayKlassObjs[i] != NULL) {
230 assert(i >= T_BOOLEAN, "checking");
231 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
232 } else if (do_all) {
233 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
234 }
235 }
236 }
237
238 f->do_ptr((void**)&_the_array_interfaces_array);
239 f->do_ptr((void**)&_the_empty_int_array);
240 f->do_ptr((void**)&_the_empty_short_array);
241 f->do_ptr((void**)&_the_empty_method_array);
242 f->do_ptr((void**)&_the_empty_klass_array);
243 _finalizer_register_cache->serialize(f);
244 _loader_addClass_cache->serialize(f);
245 _pd_implies_cache->serialize(f);
246 _throw_illegal_access_error_cache->serialize(f);
247 _do_stack_walk_cache->serialize(f);
248 }
249
250 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
251 if (size < alignment || size % alignment != 0) {
252 vm_exit_during_initialization(
253 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
254 }
255 }
256
257 void initialize_basic_type_klass(Klass* k, TRAPS) {
258 Klass* ok = SystemDictionary::Object_klass();
259 if (UseSharedSpaces) {
260 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
261 assert(k->super() == ok, "u3");
262 k->restore_unshareable_info(loader_data, Handle(), CHECK);
263 } else {
264 k->initialize_supers(ok, CHECK);
265 }
266 k->append_to_sibling_list();
267 }
268
269 void Universe::genesis(TRAPS) {
270 ResourceMark rm;
271
272 { FlagSetting fs(_bootstrapping, true);
273
274 { MutexLocker mc(Compile_lock);
275
276 // determine base vtable size; without that we cannot create the array klasses
277 compute_base_vtable_size();
278
279 if (!UseSharedSpaces) {
280 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK);
281 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK);
282 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK);
283 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK);
284 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK);
285 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK);
286 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK);
287 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK);
288
289 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj;
290 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj;
291 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj;
292 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj;
293 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj;
294 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj;
295 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj;
296 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj;
297
298 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
299
300 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
301 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
302 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
303 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
304 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
305 }
306 }
307
308 vmSymbols::initialize(CHECK);
309
310 SystemDictionary::initialize(CHECK);
311
312 Klass* ok = SystemDictionary::Object_klass();
313
314 _the_null_string = StringTable::intern("null", CHECK);
315 _the_min_jint_string = StringTable::intern("-2147483648", CHECK);
316
317 if (UseSharedSpaces) {
318 // Verify shared interfaces array.
319 assert(_the_array_interfaces_array->at(0) ==
320 SystemDictionary::Cloneable_klass(), "u3");
321 assert(_the_array_interfaces_array->at(1) ==
322 SystemDictionary::Serializable_klass(), "u3");
323 MetaspaceShared::fixup_shared_string_regions();
324 } else {
325 // Set up shared interfaces array. (Do this before supers are set up.)
326 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
327 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
328 }
329
330 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
331 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
332 initialize_basic_type_klass(singleArrayKlassObj(), CHECK);
333 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
334 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
335 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
336 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
337 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
338 } // end of core bootstrapping
339
340 // Maybe this could be lifted up now that object array can be initialized
341 // during the bootstrapping.
342
343 // OLD
344 // Initialize _objectArrayKlass after core bootstraping to make
345 // sure the super class is set up properly for _objectArrayKlass.
346 // ---
347 // NEW
348 // Since some of the old system object arrays have been converted to
349 // ordinary object arrays, _objectArrayKlass will be loaded when
350 // SystemDictionary::initialize(CHECK); is run. See the extra check
351 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
352 _objectArrayKlassObj = InstanceKlass::
353 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
354 // OLD
355 // Add the class to the class hierarchy manually to make sure that
356 // its vtable is initialized after core bootstrapping is completed.
357 // ---
358 // New
359 // Have already been initialized.
360 _objectArrayKlassObj->append_to_sibling_list();
361
362 // Compute is_jdk version flags.
363 // Only 1.3 or later has the java.lang.Shutdown class.
364 // Only 1.4 or later has the java.lang.CharSequence interface.
365 // Only 1.5 or later has the java.lang.management.MemoryUsage class.
366 if (JDK_Version::is_partially_initialized()) {
367 uint8_t jdk_version;
368 Klass* k = SystemDictionary::resolve_or_null(
369 vmSymbols::java_lang_management_MemoryUsage(), THREAD);
370 CLEAR_PENDING_EXCEPTION; // ignore exceptions
371 if (k == NULL) {
372 k = SystemDictionary::resolve_or_null(
373 vmSymbols::java_lang_CharSequence(), THREAD);
374 CLEAR_PENDING_EXCEPTION; // ignore exceptions
375 if (k == NULL) {
376 k = SystemDictionary::resolve_or_null(
377 vmSymbols::java_lang_Shutdown(), THREAD);
378 CLEAR_PENDING_EXCEPTION; // ignore exceptions
379 if (k == NULL) {
380 jdk_version = 2;
381 } else {
382 jdk_version = 3;
383 }
384 } else {
385 jdk_version = 4;
386 }
387 } else {
388 jdk_version = 5;
389 }
390 JDK_Version::fully_initialize(jdk_version);
391 }
392
393 #ifdef ASSERT
394 if (FullGCALot) {
395 // Allocate an array of dummy objects.
396 // We'd like these to be at the bottom of the old generation,
397 // so that when we free one and then collect,
398 // (almost) the whole heap moves
399 // and we find out if we actually update all the oops correctly.
400 // But we can't allocate directly in the old generation,
401 // so we allocate wherever, and hope that the first collection
402 // moves these objects to the bottom of the old generation.
403 // We can allocate directly in the permanent generation, so we do.
404 int size;
405 if (UseConcMarkSweepGC) {
406 warning("Using +FullGCALot with concurrent mark sweep gc "
407 "will not force all objects to relocate");
408 size = FullGCALotDummies;
409 } else {
410 size = FullGCALotDummies * 2;
411 }
412 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
413 objArrayHandle dummy_array(THREAD, naked_array);
414 int i = 0;
415 while (i < size) {
416 // Allocate dummy in old generation
417 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK);
418 dummy_array->obj_at_put(i++, dummy);
419 }
420 {
421 // Only modify the global variable inside the mutex.
422 // If we had a race to here, the other dummy_array instances
423 // and their elements just get dropped on the floor, which is fine.
424 MutexLocker ml(FullGCALot_lock);
425 if (_fullgc_alot_dummy_array == NULL) {
426 _fullgc_alot_dummy_array = dummy_array();
427 }
428 }
429 assert(i == _fullgc_alot_dummy_array->length(), "just checking");
430 }
431 #endif
432
433 // Initialize dependency array for null class loader
434 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK);
435
436 }
437
438 // CDS support for patching vtables in metadata in the shared archive.
439 // All types inherited from Metadata have vtables, but not types inherited
440 // from MetaspaceObj, because the latter does not have virtual functions.
441 // If the metadata type has a vtable, it cannot be shared in the read-only
442 // section of the CDS archive, because the vtable pointer is patched.
443 static inline void add_vtable(void** list, int* n, void* o, int count) {
444 guarantee((*n) < count, "vtable list too small");
445 void* vtable = dereference_vptr(o);
446 assert(*(void**)(vtable) != NULL, "invalid vtable");
447 list[(*n)++] = vtable;
448 }
449
450 void Universe::init_self_patching_vtbl_list(void** list, int count) {
451 int n = 0;
452 { InstanceKlass o; add_vtable(list, &n, &o, count); }
453 { InstanceClassLoaderKlass o; add_vtable(list, &n, &o, count); }
454 { InstanceMirrorKlass o; add_vtable(list, &n, &o, count); }
455 { InstanceRefKlass o; add_vtable(list, &n, &o, count); }
456 { TypeArrayKlass o; add_vtable(list, &n, &o, count); }
457 { ObjArrayKlass o; add_vtable(list, &n, &o, count); }
458 { Method o; add_vtable(list, &n, &o, count); }
459 { ConstantPool o; add_vtable(list, &n, &o, count); }
460 }
461
462 void Universe::initialize_basic_type_mirrors(TRAPS) {
463 assert(_int_mirror==NULL, "basic type mirrors already initialized");
464 _int_mirror =
465 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK);
466 _float_mirror =
467 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK);
468 _double_mirror =
469 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK);
470 _byte_mirror =
471 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK);
472 _bool_mirror =
473 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
474 _char_mirror =
475 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK);
476 _long_mirror =
477 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK);
478 _short_mirror =
479 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK);
480 _void_mirror =
481 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK);
482
483 _mirrors[T_INT] = _int_mirror;
484 _mirrors[T_FLOAT] = _float_mirror;
485 _mirrors[T_DOUBLE] = _double_mirror;
486 _mirrors[T_BYTE] = _byte_mirror;
487 _mirrors[T_BOOLEAN] = _bool_mirror;
488 _mirrors[T_CHAR] = _char_mirror;
489 _mirrors[T_LONG] = _long_mirror;
490 _mirrors[T_SHORT] = _short_mirror;
491 _mirrors[T_VOID] = _void_mirror;
492 //_mirrors[T_OBJECT] = _object_klass->java_mirror();
493 //_mirrors[T_ARRAY] = _object_klass->java_mirror();
494 }
495
496 void Universe::fixup_mirrors(TRAPS) {
497 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
498 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
499 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
500 // that the number of objects allocated at this point is very small.
501 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
502 HandleMark hm(THREAD);
503 // Cache the start of the static fields
504 InstanceMirrorKlass::init_offset_of_static_fields();
505
506 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
507 int list_length = list->length();
508 for (int i = 0; i < list_length; i++) {
509 Klass* k = list->at(i);
510 assert(k->is_klass(), "List should only hold classes");
511 EXCEPTION_MARK;
512 KlassHandle kh(THREAD, k);
513 java_lang_Class::fixup_mirror(kh, CATCH);
514 }
515 delete java_lang_Class::fixup_mirror_list();
516 java_lang_Class::set_fixup_mirror_list(NULL);
517 }
518
519 static bool has_run_finalizers_on_exit = false;
520
521 void Universe::run_finalizers_on_exit() {
522 if (has_run_finalizers_on_exit) return;
523 has_run_finalizers_on_exit = true;
524
525 // Called on VM exit. This ought to be run in a separate thread.
526 log_trace(ref)("Callback to run finalizers on exit");
527 {
528 PRESERVE_EXCEPTION_MARK;
529 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass());
530 JavaValue result(T_VOID);
531 JavaCalls::call_static(
532 &result,
533 finalizer_klass,
534 vmSymbols::run_finalizers_on_exit_name(),
535 vmSymbols::void_method_signature(),
536 THREAD
537 );
538 // Ignore any pending exceptions
539 CLEAR_PENDING_EXCEPTION;
540 }
541 }
542
543
544 // initialize_vtable could cause gc if
545 // 1) we specified true to initialize_vtable and
546 // 2) this ran after gc was enabled
547 // In case those ever change we use handles for oops
548 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) {
549 // init vtable of k and all subclasses
550 Klass* ko = k_h();
551 klassVtable* vt = ko->vtable();
552 if (vt) vt->initialize_vtable(false, CHECK);
553 if (ko->is_instance_klass()) {
554 for (KlassHandle s_h(THREAD, ko->subklass());
555 s_h() != NULL;
556 s_h = KlassHandle(THREAD, s_h()->next_sibling())) {
557 reinitialize_vtable_of(s_h, CHECK);
558 }
559 }
560 }
561
562
563 void initialize_itable_for_klass(Klass* k, TRAPS) {
564 InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK);
565 }
566
567
568 void Universe::reinitialize_itables(TRAPS) {
569 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK);
570
571 }
572
573
574 bool Universe::on_page_boundary(void* addr) {
575 return ((uintptr_t) addr) % os::vm_page_size() == 0;
576 }
577
578
579 bool Universe::should_fill_in_stack_trace(Handle throwable) {
580 // never attempt to fill in the stack trace of preallocated errors that do not have
581 // backtrace. These errors are kept alive forever and may be "re-used" when all
582 // preallocated errors with backtrace have been consumed. Also need to avoid
583 // a potential loop which could happen if an out of memory occurs when attempting
584 // to allocate the backtrace.
585 return ((throwable() != Universe::_out_of_memory_error_java_heap) &&
586 (throwable() != Universe::_out_of_memory_error_metaspace) &&
587 (throwable() != Universe::_out_of_memory_error_class_metaspace) &&
588 (throwable() != Universe::_out_of_memory_error_array_size) &&
589 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) &&
590 (throwable() != Universe::_out_of_memory_error_realloc_objects));
591 }
592
593
594 oop Universe::gen_out_of_memory_error(oop default_err) {
595 // generate an out of memory error:
596 // - if there is a preallocated error with backtrace available then return it wth
597 // a filled in stack trace.
598 // - if there are no preallocated errors with backtrace available then return
599 // an error without backtrace.
600 int next;
601 if (_preallocated_out_of_memory_error_avail_count > 0) {
602 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);
603 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
604 } else {
605 next = -1;
606 }
607 if (next < 0) {
608 // all preallocated errors have been used.
609 // return default
610 return default_err;
611 } else {
612 // get the error object at the slot and set set it to NULL so that the
613 // array isn't keeping it alive anymore.
614 oop exc = preallocated_out_of_memory_errors()->obj_at(next);
615 assert(exc != NULL, "slot has been used already");
616 preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
617
618 // use the message from the default error
619 oop msg = java_lang_Throwable::message(default_err);
620 assert(msg != NULL, "no message");
621 java_lang_Throwable::set_message(exc, msg);
622
623 // populate the stack trace and return it.
624 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
625 return exc;
626 }
627 }
628
629 intptr_t Universe::_non_oop_bits = 0;
630
631 void* Universe::non_oop_word() {
632 // Neither the high bits nor the low bits of this value is allowed
633 // to look like (respectively) the high or low bits of a real oop.
634 //
635 // High and low are CPU-specific notions, but low always includes
636 // the low-order bit. Since oops are always aligned at least mod 4,
637 // setting the low-order bit will ensure that the low half of the
638 // word will never look like that of a real oop.
639 //
640 // Using the OS-supplied non-memory-address word (usually 0 or -1)
641 // will take care of the high bits, however many there are.
642
643 if (_non_oop_bits == 0) {
644 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
645 }
646
647 return (void*)_non_oop_bits;
648 }
649
650 jint universe_init() {
651 assert(!Universe::_fully_initialized, "called after initialize_vtables");
652 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
653 "LogHeapWordSize is incorrect.");
654 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
655 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
656 "oop size is not not a multiple of HeapWord size");
657 TraceTime timer("Genesis", TraceStartupTime);
658 JavaClasses::compute_hard_coded_offsets();
659
660 jint status = Universe::initialize_heap();
661 if (status != JNI_OK) {
662 return status;
663 }
664
665 Metaspace::global_initialize();
666
667 // Checks 'AfterMemoryInit' constraints.
668 if (!CommandLineFlagConstraintList::check_constraints(CommandLineFlagConstraint::AfterMemoryInit)) {
669 return JNI_EINVAL;
670 }
671
672 // Create memory for metadata. Must be after initializing heap for
673 // DumpSharedSpaces.
674 ClassLoaderData::init_null_class_loader_data();
675
676 // We have a heap so create the Method* caches before
677 // Metaspace::initialize_shared_spaces() tries to populate them.
678 Universe::_finalizer_register_cache = new LatestMethodCache();
679 Universe::_loader_addClass_cache = new LatestMethodCache();
680 Universe::_pd_implies_cache = new LatestMethodCache();
681 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
682 Universe::_do_stack_walk_cache = new LatestMethodCache();
683
684 if (UseSharedSpaces) {
685 // Read the data structures supporting the shared spaces (shared
686 // system dictionary, symbol table, etc.). After that, access to
687 // the file (other than the mapped regions) is no longer needed, and
688 // the file is closed. Closing the file does not affect the
689 // currently mapped regions.
690 MetaspaceShared::initialize_shared_spaces();
691 StringTable::create_table();
692 } else {
693 SymbolTable::create_table();
694 StringTable::create_table();
695 ClassLoader::create_package_info_table();
696
697 if (DumpSharedSpaces) {
698 MetaspaceShared::prepare_for_dumping();
699 }
700 }
701
702 return JNI_OK;
703 }
704
705 CollectedHeap* Universe::create_heap() {
706 assert(_collectedHeap == NULL, "Heap already created");
707 #if !INCLUDE_ALL_GCS
708 if (UseParallelGC) {
709 fatal("UseParallelGC not supported in this VM.");
710 } else if (UseG1GC) {
711 fatal("UseG1GC not supported in this VM.");
712 } else if (UseConcMarkSweepGC) {
713 fatal("UseConcMarkSweepGC not supported in this VM.");
714 #else
715 if (UseParallelGC) {
716 return Universe::create_heap_with_policy<ParallelScavengeHeap, GenerationSizer>();
717 } else if (UseG1GC) {
718 return Universe::create_heap_with_policy<G1CollectedHeap, G1CollectorPolicy>();
719 } else if (UseConcMarkSweepGC) {
720 return Universe::create_heap_with_policy<GenCollectedHeap, ConcurrentMarkSweepPolicy>();
721 #endif
722 } else if (UseSerialGC) {
723 return Universe::create_heap_with_policy<GenCollectedHeap, MarkSweepPolicy>();
724 }
725
726 ShouldNotReachHere();
727 return NULL;
728 }
729
730 // Choose the heap base address and oop encoding mode
731 // when compressed oops are used:
732 // Unscaled - Use 32-bits oops without encoding when
733 // NarrowOopHeapBaseMin + heap_size < 4Gb
734 // ZeroBased - Use zero based compressed oops with encoding when
735 // NarrowOopHeapBaseMin + heap_size < 32Gb
736 // HeapBased - Use compressed oops with heap base + encoding.
737
738 jint Universe::initialize_heap() {
739 jint status = JNI_ERR;
740
741 _collectedHeap = create_heap_ext();
742 if (_collectedHeap == NULL) {
743 _collectedHeap = create_heap();
744 }
745
746 status = _collectedHeap->initialize();
747 if (status != JNI_OK) {
748 return status;
749 }
750 log_info(gc)("Using %s", _collectedHeap->name());
751
752 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
753
754 #ifdef _LP64
755 if (UseCompressedOops) {
756 // Subtract a page because something can get allocated at heap base.
757 // This also makes implicit null checking work, because the
758 // memory+1 page below heap_base needs to cause a signal.
759 // See needs_explicit_null_check.
760 // Only set the heap base for compressed oops because it indicates
761 // compressed oops for pstack code.
762 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) {
763 // Didn't reserve heap below 4Gb. Must shift.
764 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
765 }
766 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) {
767 // Did reserve heap below 32Gb. Can use base == 0;
768 Universe::set_narrow_oop_base(0);
769 }
770
771 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base());
772
773 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
774 Universe::print_compressed_oops_mode(tty);
775 }
776
777 // Tell tests in which mode we run.
778 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode",
779 narrow_oop_mode_to_string(narrow_oop_mode()),
780 false));
781 }
782 // Universe::narrow_oop_base() is one page below the heap.
783 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() -
784 os::vm_page_size()) ||
785 Universe::narrow_oop_base() == NULL, "invalid value");
786 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes ||
787 Universe::narrow_oop_shift() == 0, "invalid value");
788 #endif
789
790 // We will never reach the CATCH below since Exceptions::_throw will cause
791 // the VM to exit if an exception is thrown during initialization
792
793 if (UseTLAB) {
794 assert(Universe::heap()->supports_tlab_allocation(),
795 "Should support thread-local allocation buffers");
796 ThreadLocalAllocBuffer::startup_initialization();
797 }
798 return JNI_OK;
799 }
800
801 void Universe::print_compressed_oops_mode(outputStream* st) {
802 st->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
803 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M);
804
805 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode()));
806
807 if (Universe::narrow_oop_base() != 0) {
808 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base()));
809 }
810
811 if (Universe::narrow_oop_shift() != 0) {
812 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
813 }
814
815 if (!Universe::narrow_oop_use_implicit_null_checks()) {
816 st->print(", no protected page in front of the heap");
817 }
818 st->cr();
819 }
820
821 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
822
823 assert(alignment <= Arguments::conservative_max_heap_alignment(),
824 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
825 alignment, Arguments::conservative_max_heap_alignment());
826
827 size_t total_reserved = align_size_up(heap_size, alignment);
828 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
829 "heap size is too big for compressed oops");
830
831 bool use_large_pages = UseLargePages && is_size_aligned(alignment, os::large_page_size());
832 assert(!UseLargePages
833 || UseParallelGC
834 || use_large_pages, "Wrong alignment to use large pages");
835
836 // Now create the space.
837 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages);
838
839 if (total_rs.is_reserved()) {
840 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
841 "must be exactly of required size and alignment");
842 // We are good.
843
844 if (UseCompressedOops) {
845 // Universe::initialize_heap() will reset this to NULL if unscaled
846 // or zero-based narrow oops are actually used.
847 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
848 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
849 }
850
851 return total_rs;
852 }
853
854 vm_exit_during_initialization(
855 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
856 total_reserved/K));
857
858 // satisfy compiler
859 ShouldNotReachHere();
860 return ReservedHeapSpace(0, 0, false);
861 }
862
863
864 // It's the caller's responsibility to ensure glitch-freedom
865 // (if required).
866 void Universe::update_heap_info_at_gc() {
867 _heap_capacity_at_last_gc = heap()->capacity();
868 _heap_used_at_last_gc = heap()->used();
869 }
870
871
872 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) {
873 switch (mode) {
874 case UnscaledNarrowOop:
875 return "32-bit";
876 case ZeroBasedNarrowOop:
877 return "Zero based";
878 case DisjointBaseNarrowOop:
879 return "Non-zero disjoint base";
880 case HeapBasedNarrowOop:
881 return "Non-zero based";
882 }
883
884 ShouldNotReachHere();
885 return "";
886 }
887
888
889 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() {
890 if (narrow_oop_base_disjoint()) {
891 return DisjointBaseNarrowOop;
892 }
893
894 if (narrow_oop_base() != 0) {
895 return HeapBasedNarrowOop;
896 }
897
898 if (narrow_oop_shift() != 0) {
899 return ZeroBasedNarrowOop;
900 }
901
902 return UnscaledNarrowOop;
903 }
904
905
906 void universe2_init() {
907 EXCEPTION_MARK;
908 Universe::genesis(CATCH);
909 }
910
911
912 bool universe_post_init() {
913 assert(!is_init_completed(), "Error: initialization not yet completed!");
914 Universe::_fully_initialized = true;
915 EXCEPTION_MARK;
916 { ResourceMark rm;
917 Interpreter::initialize(); // needed for interpreter entry points
918 if (!UseSharedSpaces) {
919 HandleMark hm(THREAD);
920 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass());
921 Universe::reinitialize_vtable_of(ok_h, CHECK_false);
922 Universe::reinitialize_itables(CHECK_false);
923 }
924 }
925
926 HandleMark hm(THREAD);
927 Klass* k;
928 instanceKlassHandle k_h;
929 // Setup preallocated empty java.lang.Class array
930 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
931
932 // Setup preallocated OutOfMemoryError errors
933 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
934 k_h = instanceKlassHandle(THREAD, k);
935 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false);
936 Universe::_out_of_memory_error_metaspace = k_h->allocate_instance(CHECK_false);
937 Universe::_out_of_memory_error_class_metaspace = k_h->allocate_instance(CHECK_false);
938 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false);
939 Universe::_out_of_memory_error_gc_overhead_limit =
940 k_h->allocate_instance(CHECK_false);
941 Universe::_out_of_memory_error_realloc_objects = k_h->allocate_instance(CHECK_false);
942
943 // Setup preallocated NullPointerException
944 // (this is currently used for a cheap & dirty solution in compiler exception handling)
945 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
946 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
947 // Setup preallocated ArithmeticException
948 // (this is currently used for a cheap & dirty solution in compiler exception handling)
949 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
950 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
951 // Virtual Machine Error for when we get into a situation we can't resolve
952 k = SystemDictionary::resolve_or_fail(
953 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
954 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
955 if (!linked) {
956 tty->print_cr("Unable to link/verify VirtualMachineError class");
957 return false; // initialization failed
958 }
959 Universe::_virtual_machine_error_instance =
960 InstanceKlass::cast(k)->allocate_instance(CHECK_false);
961
962 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
963
964 if (!DumpSharedSpaces) {
965 // These are the only Java fields that are currently set during shared space dumping.
966 // We prefer to not handle this generally, so we always reinitialize these detail messages.
967 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
968 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
969
970 msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
971 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
972 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
973 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
974
975 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
976 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
977
978 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
979 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
980
981 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false);
982 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg());
983
984 msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
985 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
986
987 // Setup the array of errors that have preallocated backtrace
988 k = Universe::_out_of_memory_error_java_heap->klass();
989 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
990 k_h = instanceKlassHandle(THREAD, k);
991
992 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
993 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false);
994 for (int i=0; i<len; i++) {
995 oop err = k_h->allocate_instance(CHECK_false);
996 Handle err_h = Handle(THREAD, err);
997 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
998 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
999 }
1000 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
1001 }
1002
1003
1004 // Setup static method for registering finalizers
1005 // The finalizer klass must be linked before looking up the method, in
1006 // case it needs to get rewritten.
1007 SystemDictionary::Finalizer_klass()->link_class(CHECK_false);
1008 Method* m = SystemDictionary::Finalizer_klass()->find_method(
1009 vmSymbols::register_method_name(),
1010 vmSymbols::register_method_signature());
1011 if (m == NULL || !m->is_static()) {
1012 tty->print_cr("Unable to link/verify Finalizer.register method");
1013 return false; // initialization failed (cannot throw exception yet)
1014 }
1015 Universe::_finalizer_register_cache->init(
1016 SystemDictionary::Finalizer_klass(), m);
1017
1018 SystemDictionary::internal_Unsafe_klass()->link_class(CHECK_false);
1019 m = SystemDictionary::internal_Unsafe_klass()->find_method(
1020 vmSymbols::throwIllegalAccessError_name(),
1021 vmSymbols::void_method_signature());
1022 if (m != NULL && !m->is_static()) {
1023 // Note null is okay; this method is used in itables, and if it is null,
1024 // then AbstractMethodError is thrown instead.
1025 tty->print_cr("Unable to link/verify Unsafe.throwIllegalAccessError method");
1026 return false; // initialization failed (cannot throw exception yet)
1027 }
1028 Universe::_throw_illegal_access_error_cache->init(
1029 SystemDictionary::internal_Unsafe_klass(), m);
1030
1031 // Setup method for registering loaded classes in class loader vector
1032 SystemDictionary::ClassLoader_klass()->link_class(CHECK_false);
1033 m = SystemDictionary::ClassLoader_klass()->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature());
1034 if (m == NULL || m->is_static()) {
1035 tty->print_cr("Unable to link/verify ClassLoader.addClass method");
1036 return false; // initialization failed (cannot throw exception yet)
1037 }
1038 Universe::_loader_addClass_cache->init(
1039 SystemDictionary::ClassLoader_klass(), m);
1040
1041 // Setup method for checking protection domain
1042 SystemDictionary::ProtectionDomain_klass()->link_class(CHECK_false);
1043 m = SystemDictionary::ProtectionDomain_klass()->
1044 find_method(vmSymbols::impliesCreateAccessControlContext_name(),
1045 vmSymbols::void_boolean_signature());
1046 // Allow NULL which should only happen with bootstrapping.
1047 if (m != NULL) {
1048 if (m->is_static()) {
1049 // NoSuchMethodException doesn't actually work because it tries to run the
1050 // <init> function before java_lang_Class is linked. Print error and exit.
1051 tty->print_cr("ProtectionDomain.impliesCreateAccessControlContext() has the wrong linkage");
1052 return false; // initialization failed
1053 }
1054 Universe::_pd_implies_cache->init(
1055 SystemDictionary::ProtectionDomain_klass(), m);
1056 }
1057
1058 // Setup method for stack walking
1059 InstanceKlass::cast(SystemDictionary::AbstractStackWalker_klass())->link_class(CHECK_false);
1060 m = InstanceKlass::cast(SystemDictionary::AbstractStackWalker_klass())->
1061 find_method(vmSymbols::doStackWalk_name(),
1062 vmSymbols::doStackWalk_signature());
1063 // Allow NULL which should only happen with bootstrapping.
1064 if (m != NULL) {
1065 Universe::_do_stack_walk_cache->init(
1066 SystemDictionary::AbstractStackWalker_klass(), m);
1067 }
1068
1069 // This needs to be done before the first scavenge/gc, since
1070 // it's an input to soft ref clearing policy.
1071 {
1072 MutexLocker x(Heap_lock);
1073 Universe::update_heap_info_at_gc();
1074 }
1075
1076 // ("weak") refs processing infrastructure initialization
1077 Universe::heap()->post_initialize();
1078
1079 // Initialize performance counters for metaspaces
1080 MetaspaceCounters::initialize_performance_counters();
1081 CompressedClassSpaceCounters::initialize_performance_counters();
1082
1083 MemoryService::add_metaspace_memory_pools();
1084
1085 MemoryService::set_universe_heap(Universe::heap());
1086 #if INCLUDE_CDS
1087 SharedClassUtil::initialize(CHECK_false);
1088 #endif
1089 return true;
1090 }
1091
1092
1093 void Universe::compute_base_vtable_size() {
1094 _base_vtable_size = ClassLoader::compute_Object_vtable();
1095 }
1096
1097 void Universe::print_on(outputStream* st) {
1098 st->print_cr("Heap");
1099 heap()->print_on(st);
1100 }
1101
1102 void Universe::print_heap_at_SIGBREAK() {
1103 if (PrintHeapAtSIGBREAK) {
1104 MutexLocker hl(Heap_lock);
1105 print_on(tty);
1106 tty->cr();
1107 tty->flush();
1108 }
1109 }
1110
1111 void Universe::print_heap_before_gc() {
1112 LogHandle(gc, heap) log;
1113 if (log.is_trace()) {
1114 log.trace("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1115 ResourceMark rm;
1116 heap()->print_on(log.trace_stream());
1117 }
1118 }
1119
1120 void Universe::print_heap_after_gc() {
1121 LogHandle(gc, heap) log;
1122 if (log.is_trace()) {
1123 log.trace("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1124 ResourceMark rm;
1125 heap()->print_on(log.trace_stream());
1126 }
1127 }
1128
1129 void Universe::verify(VerifyOption option, const char* prefix) {
1130 // The use of _verify_in_progress is a temporary work around for
1131 // 6320749. Don't bother with a creating a class to set and clear
1132 // it since it is only used in this method and the control flow is
1133 // straight forward.
1134 _verify_in_progress = true;
1135
1136 COMPILER2_PRESENT(
1137 assert(!DerivedPointerTable::is_active(),
1138 "DPT should not be active during verification "
1139 "(of thread stacks below)");
1140 )
1141
1142 ResourceMark rm;
1143 HandleMark hm; // Handles created during verification can be zapped
1144 _verify_count++;
1145
1146 FormatBuffer<> title("Verifying %s", prefix);
1147 GCTraceTime(Info, gc, verify) tm(title.buffer());
1148 log_debug(gc, verify)("Threads");
1149 Threads::verify();
1150 log_debug(gc, verify)("Heap");
1151 heap()->verify(option);
1152 log_debug(gc, verify)("SymbolTable");
1153 SymbolTable::verify();
1154 log_debug(gc, verify)("StringTable");
1155 StringTable::verify();
1156 {
1157 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1158 log_debug(gc, verify)("CodeCache");
1159 CodeCache::verify();
1160 }
1161 log_debug(gc, verify)("SystemDictionary");
1162 SystemDictionary::verify();
1163 #ifndef PRODUCT
1164 log_debug(gc, verify)("ClassLoaderDataGraph");
1165 ClassLoaderDataGraph::verify();
1166 #endif
1167 log_debug(gc, verify)("MetaspaceAux");
1168 MetaspaceAux::verify_free_chunks();
1169 log_debug(gc, verify)("JNIHandles");
1170 JNIHandles::verify();
1171 log_debug(gc, verify)("C-heap");
1172 os::check_heap();
1173 log_debug(gc, verify)("CodeCache Oops");
1174 CodeCache::verify_oops();
1175
1176 _verify_in_progress = false;
1177 }
1178
1179
1180 #ifndef PRODUCT
1181 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1182 assert(low_boundary < high_boundary, "bad interval");
1183
1184 // decide which low-order bits we require to be clear:
1185 size_t alignSize = MinObjAlignmentInBytes;
1186 size_t min_object_size = CollectedHeap::min_fill_size();
1187
1188 // make an inclusive limit:
1189 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1190 uintptr_t min = (uintptr_t)low_boundary;
1191 assert(min < max, "bad interval");
1192 uintptr_t diff = max ^ min;
1193
1194 // throw away enough low-order bits to make the diff vanish
1195 uintptr_t mask = (uintptr_t)(-1);
1196 while ((mask & diff) != 0)
1197 mask <<= 1;
1198 uintptr_t bits = (min & mask);
1199 assert(bits == (max & mask), "correct mask");
1200 // check an intermediate value between min and max, just to make sure:
1201 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1202
1203 // require address alignment, too:
1204 mask |= (alignSize - 1);
1205
1206 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1207 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1208 }
1209 _verify_oop_mask = mask;
1210 _verify_oop_bits = bits;
1211 }
1212
1213 // Oop verification (see MacroAssembler::verify_oop)
1214
1215 uintptr_t Universe::verify_oop_mask() {
1216 MemRegion m = heap()->reserved_region();
1217 calculate_verify_data(m.start(), m.end());
1218 return _verify_oop_mask;
1219 }
1220
1221 uintptr_t Universe::verify_oop_bits() {
1222 MemRegion m = heap()->reserved_region();
1223 calculate_verify_data(m.start(), m.end());
1224 return _verify_oop_bits;
1225 }
1226
1227 uintptr_t Universe::verify_mark_mask() {
1228 return markOopDesc::lock_mask_in_place;
1229 }
1230
1231 uintptr_t Universe::verify_mark_bits() {
1232 intptr_t mask = verify_mark_mask();
1233 intptr_t bits = (intptr_t)markOopDesc::prototype();
1234 assert((bits & ~mask) == 0, "no stray header bits");
1235 return bits;
1236 }
1237 #endif // PRODUCT
1238
1239
1240 void Universe::compute_verify_oop_data() {
1241 verify_oop_mask();
1242 verify_oop_bits();
1243 verify_mark_mask();
1244 verify_mark_bits();
1245 }
1246
1247
1248 void LatestMethodCache::init(Klass* k, Method* m) {
1249 if (!UseSharedSpaces) {
1250 _klass = k;
1251 }
1252 #ifndef PRODUCT
1253 else {
1254 // sharing initilization should have already set up _klass
1255 assert(_klass != NULL, "just checking");
1256 }
1257 #endif
1258
1259 _method_idnum = m->method_idnum();
1260 assert(_method_idnum >= 0, "sanity check");
1261 }
1262
1263
1264 Method* LatestMethodCache::get_method() {
1265 if (klass() == NULL) return NULL;
1266 InstanceKlass* ik = InstanceKlass::cast(klass());
1267 Method* m = ik->method_with_idnum(method_idnum());
1268 assert(m != NULL, "sanity check");
1269 return m;
1270 }
1271
1272
1273 #ifdef ASSERT
1274 // Release dummy object(s) at bottom of heap
1275 bool Universe::release_fullgc_alot_dummy() {
1276 MutexLocker ml(FullGCALot_lock);
1277 if (_fullgc_alot_dummy_array != NULL) {
1278 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
1279 // No more dummies to release, release entire array instead
1280 _fullgc_alot_dummy_array = NULL;
1281 return false;
1282 }
1283 if (!UseConcMarkSweepGC) {
1284 // Release dummy at bottom of old generation
1285 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1286 }
1287 // Release dummy at bottom of permanent generation
1288 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1289 }
1290 return true;
1291 }
1292
1293 #endif // ASSERT