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_interface/collectedHeap.inline.hpp"
35 #include "interpreter/interpreter.hpp"
36 #include "memory/cardTableModRefBS.hpp"
37 #include "memory/filemap.hpp"
38 #include "memory/gcLocker.inline.hpp"
39 #include "memory/genCollectedHeap.hpp"
40 #include "memory/genRemSet.hpp"
41 #include "memory/generation.hpp"
42 #include "memory/metadataFactory.hpp"
43 #include "memory/metaspaceShared.hpp"
44 #include "memory/oopFactory.hpp"
45 #include "memory/space.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/oop.inline.hpp"
54 #include "oops/typeArrayKlass.hpp"
55 #include "prims/jvmtiRedefineClassesTrace.hpp"
56 #include "runtime/arguments.hpp"
57 #include "runtime/atomic.inline.hpp"
58 #include "runtime/deoptimization.hpp"
59 #include "runtime/fprofiler.hpp"
60 #include "runtime/handles.inline.hpp"
61 #include "runtime/init.hpp"
62 #include "runtime/java.hpp"
63 #include "runtime/javaCalls.hpp"
64 #include "runtime/sharedRuntime.hpp"
65 #include "runtime/synchronizer.hpp"
66 #include "runtime/thread.inline.hpp"
67 #include "runtime/timer.hpp"
68 #include "runtime/vm_operations.hpp"
69 #include "services/memoryService.hpp"
70 #include "utilities/copy.hpp"
71 #include "utilities/events.hpp"
72 #include "utilities/hashtable.inline.hpp"
73 #include "utilities/preserveException.hpp"
74 #include "utilities/macros.hpp"
75 #if INCLUDE_ALL_GCS
76 #include "gc_implementation/shared/adaptiveSizePolicy.hpp"
77 #include "gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.hpp"
78 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
79 #include "gc_implementation/g1/g1CollectorPolicy_ext.hpp"
80 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
81 #endif // INCLUDE_ALL_GCS
82 #if INCLUDE_CDS
83 #include "classfile/sharedClassUtil.hpp"
84 #endif
85
86 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
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 int Universe::_base_vtable_size = 0;
147 bool Universe::_bootstrapping = false;
148 bool Universe::_fully_initialized = false;
149
150 size_t Universe::_heap_capacity_at_last_gc;
151 size_t Universe::_heap_used_at_last_gc = 0;
152
153 CollectedHeap* Universe::_collectedHeap = NULL;
154
155 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true };
156 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true };
157 address Universe::_narrow_ptrs_base;
158
159 void Universe::basic_type_classes_do(void f(Klass*)) {
160 f(boolArrayKlassObj());
161 f(byteArrayKlassObj());
162 f(charArrayKlassObj());
163 f(intArrayKlassObj());
164 f(shortArrayKlassObj());
165 f(longArrayKlassObj());
166 f(singleArrayKlassObj());
167 f(doubleArrayKlassObj());
168 }
169
170 void Universe::oops_do(OopClosure* f, bool do_all) {
171
172 f->do_oop((oop*) &_int_mirror);
173 f->do_oop((oop*) &_float_mirror);
174 f->do_oop((oop*) &_double_mirror);
175 f->do_oop((oop*) &_byte_mirror);
176 f->do_oop((oop*) &_bool_mirror);
177 f->do_oop((oop*) &_char_mirror);
178 f->do_oop((oop*) &_long_mirror);
179 f->do_oop((oop*) &_short_mirror);
180 f->do_oop((oop*) &_void_mirror);
181
182 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
183 f->do_oop((oop*) &_mirrors[i]);
184 }
185 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
186
187 f->do_oop((oop*)&_the_empty_class_klass_array);
188 f->do_oop((oop*)&_the_null_string);
189 f->do_oop((oop*)&_the_min_jint_string);
190 f->do_oop((oop*)&_out_of_memory_error_java_heap);
191 f->do_oop((oop*)&_out_of_memory_error_metaspace);
192 f->do_oop((oop*)&_out_of_memory_error_class_metaspace);
193 f->do_oop((oop*)&_out_of_memory_error_array_size);
194 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit);
195 f->do_oop((oop*)&_out_of_memory_error_realloc_objects);
196 f->do_oop((oop*)&_preallocated_out_of_memory_error_array);
197 f->do_oop((oop*)&_null_ptr_exception_instance);
198 f->do_oop((oop*)&_arithmetic_exception_instance);
199 f->do_oop((oop*)&_virtual_machine_error_instance);
200 f->do_oop((oop*)&_main_thread_group);
201 f->do_oop((oop*)&_system_thread_group);
202 f->do_oop((oop*)&_vm_exception);
203 f->do_oop((oop*)&_allocation_context_notification_obj);
204 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);)
205 }
206
207 // Serialize metadata in and out of CDS archive, not oops.
208 void Universe::serialize(SerializeClosure* f, bool do_all) {
209
210 f->do_ptr((void**)&_boolArrayKlassObj);
211 f->do_ptr((void**)&_byteArrayKlassObj);
212 f->do_ptr((void**)&_charArrayKlassObj);
213 f->do_ptr((void**)&_intArrayKlassObj);
214 f->do_ptr((void**)&_shortArrayKlassObj);
215 f->do_ptr((void**)&_longArrayKlassObj);
216 f->do_ptr((void**)&_singleArrayKlassObj);
217 f->do_ptr((void**)&_doubleArrayKlassObj);
218 f->do_ptr((void**)&_objectArrayKlassObj);
219
220 {
221 for (int i = 0; i < T_VOID+1; i++) {
222 if (_typeArrayKlassObjs[i] != NULL) {
223 assert(i >= T_BOOLEAN, "checking");
224 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
225 } else if (do_all) {
226 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
227 }
228 }
229 }
230
231 f->do_ptr((void**)&_the_array_interfaces_array);
232 f->do_ptr((void**)&_the_empty_int_array);
233 f->do_ptr((void**)&_the_empty_short_array);
234 f->do_ptr((void**)&_the_empty_method_array);
235 f->do_ptr((void**)&_the_empty_klass_array);
236 _finalizer_register_cache->serialize(f);
237 _loader_addClass_cache->serialize(f);
238 _pd_implies_cache->serialize(f);
239 _throw_illegal_access_error_cache->serialize(f);
240 }
241
242 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
243 if (size < alignment || size % alignment != 0) {
244 vm_exit_during_initialization(
245 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
246 }
247 }
248
249 void initialize_basic_type_klass(Klass* k, TRAPS) {
250 Klass* ok = SystemDictionary::Object_klass();
251 if (UseSharedSpaces) {
252 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
253 assert(k->super() == ok, "u3");
254 k->restore_unshareable_info(loader_data, Handle(), CHECK);
255 } else {
256 k->initialize_supers(ok, CHECK);
257 }
258 k->append_to_sibling_list();
259 }
260
261 void Universe::genesis(TRAPS) {
262 ResourceMark rm;
263
264 { FlagSetting fs(_bootstrapping, true);
265
266 { MutexLocker mc(Compile_lock);
267
268 // determine base vtable size; without that we cannot create the array klasses
269 compute_base_vtable_size();
270
271 if (!UseSharedSpaces) {
272 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK);
273 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK);
274 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK);
275 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK);
276 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK);
277 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK);
278 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK);
279 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK);
280
281 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj;
282 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj;
283 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj;
284 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj;
285 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj;
286 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj;
287 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj;
288 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj;
289
290 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
291
292 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
293 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
294 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
295 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
296 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
297 }
298 }
299
300 vmSymbols::initialize(CHECK);
301
302 SystemDictionary::initialize(CHECK);
303
304 Klass* ok = SystemDictionary::Object_klass();
305
306 _the_null_string = StringTable::intern("null", CHECK);
307 _the_min_jint_string = StringTable::intern("-2147483648", CHECK);
308
309 if (UseSharedSpaces) {
310 // Verify shared interfaces array.
311 assert(_the_array_interfaces_array->at(0) ==
312 SystemDictionary::Cloneable_klass(), "u3");
313 assert(_the_array_interfaces_array->at(1) ==
314 SystemDictionary::Serializable_klass(), "u3");
315 } else {
316 // Set up shared interfaces array. (Do this before supers are set up.)
317 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
318 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
319 }
320
321 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
322 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
323 initialize_basic_type_klass(singleArrayKlassObj(), CHECK);
324 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
325 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
326 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
327 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
328 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
329 } // end of core bootstrapping
330
331 // Maybe this could be lifted up now that object array can be initialized
332 // during the bootstrapping.
333
334 // OLD
335 // Initialize _objectArrayKlass after core bootstraping to make
336 // sure the super class is set up properly for _objectArrayKlass.
337 // ---
338 // NEW
339 // Since some of the old system object arrays have been converted to
340 // ordinary object arrays, _objectArrayKlass will be loaded when
341 // SystemDictionary::initialize(CHECK); is run. See the extra check
342 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
343 _objectArrayKlassObj = InstanceKlass::
344 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
345 // OLD
346 // Add the class to the class hierarchy manually to make sure that
347 // its vtable is initialized after core bootstrapping is completed.
348 // ---
349 // New
350 // Have already been initialized.
351 _objectArrayKlassObj->append_to_sibling_list();
352
353 // Compute is_jdk version flags.
354 // Only 1.3 or later has the java.lang.Shutdown class.
355 // Only 1.4 or later has the java.lang.CharSequence interface.
356 // Only 1.5 or later has the java.lang.management.MemoryUsage class.
357 if (JDK_Version::is_partially_initialized()) {
358 uint8_t jdk_version;
359 Klass* k = SystemDictionary::resolve_or_null(
360 vmSymbols::java_lang_management_MemoryUsage(), THREAD);
361 CLEAR_PENDING_EXCEPTION; // ignore exceptions
362 if (k == NULL) {
363 k = SystemDictionary::resolve_or_null(
364 vmSymbols::java_lang_CharSequence(), THREAD);
365 CLEAR_PENDING_EXCEPTION; // ignore exceptions
366 if (k == NULL) {
367 k = SystemDictionary::resolve_or_null(
368 vmSymbols::java_lang_Shutdown(), THREAD);
369 CLEAR_PENDING_EXCEPTION; // ignore exceptions
370 if (k == NULL) {
371 jdk_version = 2;
372 } else {
373 jdk_version = 3;
374 }
375 } else {
376 jdk_version = 4;
377 }
378 } else {
379 jdk_version = 5;
380 }
381 JDK_Version::fully_initialize(jdk_version);
382 }
383
384 #ifdef ASSERT
385 if (FullGCALot) {
386 // Allocate an array of dummy objects.
387 // We'd like these to be at the bottom of the old generation,
388 // so that when we free one and then collect,
389 // (almost) the whole heap moves
390 // and we find out if we actually update all the oops correctly.
391 // But we can't allocate directly in the old generation,
392 // so we allocate wherever, and hope that the first collection
393 // moves these objects to the bottom of the old generation.
394 // We can allocate directly in the permanent generation, so we do.
395 int size;
396 if (UseConcMarkSweepGC) {
397 warning("Using +FullGCALot with concurrent mark sweep gc "
398 "will not force all objects to relocate");
399 size = FullGCALotDummies;
400 } else {
401 size = FullGCALotDummies * 2;
402 }
403 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
404 objArrayHandle dummy_array(THREAD, naked_array);
405 int i = 0;
406 while (i < size) {
407 // Allocate dummy in old generation
408 oop dummy = InstanceKlass::cast(SystemDictionary::Object_klass())->allocate_instance(CHECK);
409 dummy_array->obj_at_put(i++, dummy);
410 }
411 {
412 // Only modify the global variable inside the mutex.
413 // If we had a race to here, the other dummy_array instances
414 // and their elements just get dropped on the floor, which is fine.
415 MutexLocker ml(FullGCALot_lock);
416 if (_fullgc_alot_dummy_array == NULL) {
417 _fullgc_alot_dummy_array = dummy_array();
418 }
419 }
420 assert(i == _fullgc_alot_dummy_array->length(), "just checking");
421 }
422 #endif
423
424 // Initialize dependency array for null class loader
425 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK);
426
427 }
428
429 // CDS support for patching vtables in metadata in the shared archive.
430 // All types inherited from Metadata have vtables, but not types inherited
431 // from MetaspaceObj, because the latter does not have virtual functions.
432 // If the metadata type has a vtable, it cannot be shared in the read-only
433 // section of the CDS archive, because the vtable pointer is patched.
434 static inline void add_vtable(void** list, int* n, void* o, int count) {
435 guarantee((*n) < count, "vtable list too small");
436 void* vtable = dereference_vptr(o);
437 assert(*(void**)(vtable) != NULL, "invalid vtable");
438 list[(*n)++] = vtable;
439 }
440
441 void Universe::init_self_patching_vtbl_list(void** list, int count) {
442 int n = 0;
443 { InstanceKlass o; add_vtable(list, &n, &o, count); }
444 { InstanceClassLoaderKlass o; add_vtable(list, &n, &o, count); }
445 { InstanceMirrorKlass o; add_vtable(list, &n, &o, count); }
446 { InstanceRefKlass o; add_vtable(list, &n, &o, count); }
447 { TypeArrayKlass o; add_vtable(list, &n, &o, count); }
448 { ObjArrayKlass o; add_vtable(list, &n, &o, count); }
449 { Method o; add_vtable(list, &n, &o, count); }
450 { ConstantPool o; add_vtable(list, &n, &o, count); }
451 }
452
453 void Universe::initialize_basic_type_mirrors(TRAPS) {
454 assert(_int_mirror==NULL, "basic type mirrors already initialized");
455 _int_mirror =
456 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK);
457 _float_mirror =
458 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK);
459 _double_mirror =
460 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK);
461 _byte_mirror =
462 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK);
463 _bool_mirror =
464 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
465 _char_mirror =
466 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK);
467 _long_mirror =
468 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK);
469 _short_mirror =
470 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK);
471 _void_mirror =
472 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK);
473
474 _mirrors[T_INT] = _int_mirror;
475 _mirrors[T_FLOAT] = _float_mirror;
476 _mirrors[T_DOUBLE] = _double_mirror;
477 _mirrors[T_BYTE] = _byte_mirror;
478 _mirrors[T_BOOLEAN] = _bool_mirror;
479 _mirrors[T_CHAR] = _char_mirror;
480 _mirrors[T_LONG] = _long_mirror;
481 _mirrors[T_SHORT] = _short_mirror;
482 _mirrors[T_VOID] = _void_mirror;
483 //_mirrors[T_OBJECT] = InstanceKlass::cast(_object_klass)->java_mirror();
484 //_mirrors[T_ARRAY] = InstanceKlass::cast(_object_klass)->java_mirror();
485 }
486
487 void Universe::fixup_mirrors(TRAPS) {
488 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
489 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
490 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
491 // that the number of objects allocated at this point is very small.
492 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
493 HandleMark hm(THREAD);
494 // Cache the start of the static fields
495 InstanceMirrorKlass::init_offset_of_static_fields();
496
497 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
498 int list_length = list->length();
499 for (int i = 0; i < list_length; i++) {
500 Klass* k = list->at(i);
501 assert(k->is_klass(), "List should only hold classes");
502 EXCEPTION_MARK;
503 KlassHandle kh(THREAD, k);
504 java_lang_Class::fixup_mirror(kh, CATCH);
505 }
506 delete java_lang_Class::fixup_mirror_list();
507 java_lang_Class::set_fixup_mirror_list(NULL);
508 }
509
510 static bool has_run_finalizers_on_exit = false;
511
512 void Universe::run_finalizers_on_exit() {
513 if (has_run_finalizers_on_exit) return;
514 has_run_finalizers_on_exit = true;
515
516 // Called on VM exit. This ought to be run in a separate thread.
517 if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit");
518 {
519 PRESERVE_EXCEPTION_MARK;
520 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass());
521 JavaValue result(T_VOID);
522 JavaCalls::call_static(
523 &result,
524 finalizer_klass,
525 vmSymbols::run_finalizers_on_exit_name(),
526 vmSymbols::void_method_signature(),
527 THREAD
528 );
529 // Ignore any pending exceptions
530 CLEAR_PENDING_EXCEPTION;
531 }
532 }
533
534
535 // initialize_vtable could cause gc if
536 // 1) we specified true to initialize_vtable and
537 // 2) this ran after gc was enabled
538 // In case those ever change we use handles for oops
539 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) {
540 // init vtable of k and all subclasses
541 Klass* ko = k_h();
542 klassVtable* vt = ko->vtable();
543 if (vt) vt->initialize_vtable(false, CHECK);
544 if (ko->oop_is_instance()) {
545 InstanceKlass* ik = (InstanceKlass*)ko;
546 for (KlassHandle s_h(THREAD, ik->subklass());
547 s_h() != NULL;
548 s_h = KlassHandle(THREAD, s_h()->next_sibling())) {
549 reinitialize_vtable_of(s_h, CHECK);
550 }
551 }
552 }
553
554
555 void initialize_itable_for_klass(Klass* k, TRAPS) {
556 InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK);
557 }
558
559
560 void Universe::reinitialize_itables(TRAPS) {
561 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK);
562
563 }
564
565
566 bool Universe::on_page_boundary(void* addr) {
567 return ((uintptr_t) addr) % os::vm_page_size() == 0;
568 }
569
570
571 bool Universe::should_fill_in_stack_trace(Handle throwable) {
572 // never attempt to fill in the stack trace of preallocated errors that do not have
573 // backtrace. These errors are kept alive forever and may be "re-used" when all
574 // preallocated errors with backtrace have been consumed. Also need to avoid
575 // a potential loop which could happen if an out of memory occurs when attempting
576 // to allocate the backtrace.
577 return ((throwable() != Universe::_out_of_memory_error_java_heap) &&
578 (throwable() != Universe::_out_of_memory_error_metaspace) &&
579 (throwable() != Universe::_out_of_memory_error_class_metaspace) &&
580 (throwable() != Universe::_out_of_memory_error_array_size) &&
581 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) &&
582 (throwable() != Universe::_out_of_memory_error_realloc_objects));
583 }
584
585
586 oop Universe::gen_out_of_memory_error(oop default_err) {
587 // generate an out of memory error:
588 // - if there is a preallocated error with backtrace available then return it wth
589 // a filled in stack trace.
590 // - if there are no preallocated errors with backtrace available then return
591 // an error without backtrace.
592 int next;
593 if (_preallocated_out_of_memory_error_avail_count > 0) {
594 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);
595 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
596 } else {
597 next = -1;
598 }
599 if (next < 0) {
600 // all preallocated errors have been used.
601 // return default
602 return default_err;
603 } else {
604 // get the error object at the slot and set set it to NULL so that the
605 // array isn't keeping it alive anymore.
606 oop exc = preallocated_out_of_memory_errors()->obj_at(next);
607 assert(exc != NULL, "slot has been used already");
608 preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
609
610 // use the message from the default error
611 oop msg = java_lang_Throwable::message(default_err);
612 assert(msg != NULL, "no message");
613 java_lang_Throwable::set_message(exc, msg);
614
615 // populate the stack trace and return it.
616 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
617 return exc;
618 }
619 }
620
621 intptr_t Universe::_non_oop_bits = 0;
622
623 void* Universe::non_oop_word() {
624 // Neither the high bits nor the low bits of this value is allowed
625 // to look like (respectively) the high or low bits of a real oop.
626 //
627 // High and low are CPU-specific notions, but low always includes
628 // the low-order bit. Since oops are always aligned at least mod 4,
629 // setting the low-order bit will ensure that the low half of the
630 // word will never look like that of a real oop.
631 //
632 // Using the OS-supplied non-memory-address word (usually 0 or -1)
633 // will take care of the high bits, however many there are.
634
635 if (_non_oop_bits == 0) {
636 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
637 }
638
639 return (void*)_non_oop_bits;
640 }
641
642 jint universe_init() {
643 assert(!Universe::_fully_initialized, "called after initialize_vtables");
644 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
645 "LogHeapWordSize is incorrect.");
646 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
647 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
648 "oop size is not not a multiple of HeapWord size");
649 TraceTime timer("Genesis", TraceStartupTime);
650 JavaClasses::compute_hard_coded_offsets();
651
652 jint status = Universe::initialize_heap();
653 if (status != JNI_OK) {
654 return status;
655 }
656
657 Metaspace::global_initialize();
658
659 // Create memory for metadata. Must be after initializing heap for
660 // DumpSharedSpaces.
661 ClassLoaderData::init_null_class_loader_data();
662
663 // We have a heap so create the Method* caches before
664 // Metaspace::initialize_shared_spaces() tries to populate them.
665 Universe::_finalizer_register_cache = new LatestMethodCache();
666 Universe::_loader_addClass_cache = new LatestMethodCache();
667 Universe::_pd_implies_cache = new LatestMethodCache();
668 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
669
670 if (UseSharedSpaces) {
671 // Read the data structures supporting the shared spaces (shared
672 // system dictionary, symbol table, etc.). After that, access to
673 // the file (other than the mapped regions) is no longer needed, and
674 // the file is closed. Closing the file does not affect the
675 // currently mapped regions.
676 MetaspaceShared::initialize_shared_spaces();
677 StringTable::create_table();
678 } else {
679 SymbolTable::create_table();
680 StringTable::create_table();
681 ClassLoader::create_package_info_table();
682
683 if (DumpSharedSpaces) {
684 MetaspaceShared::prepare_for_dumping();
685 }
686 }
687
688 return JNI_OK;
689 }
690
691 // Choose the heap base address and oop encoding mode
692 // when compressed oops are used:
693 // Unscaled - Use 32-bits oops without encoding when
694 // NarrowOopHeapBaseMin + heap_size < 4Gb
695 // ZeroBased - Use zero based compressed oops with encoding when
696 // NarrowOopHeapBaseMin + heap_size < 32Gb
697 // HeapBased - Use compressed oops with heap base + encoding.
698
699 jint Universe::initialize_heap() {
700
701 if (UseParallelGC) {
702 #if INCLUDE_ALL_GCS
703 Universe::_collectedHeap = new ParallelScavengeHeap();
704 #else // INCLUDE_ALL_GCS
705 fatal("UseParallelGC not supported in this VM.");
706 #endif // INCLUDE_ALL_GCS
707
708 } else if (UseG1GC) {
709 #if INCLUDE_ALL_GCS
710 G1CollectorPolicyExt* g1p = new G1CollectorPolicyExt();
711 g1p->initialize_all();
712 G1CollectedHeap* g1h = new G1CollectedHeap(g1p);
713 Universe::_collectedHeap = g1h;
714 #else // INCLUDE_ALL_GCS
715 fatal("UseG1GC not supported in java kernel vm.");
716 #endif // INCLUDE_ALL_GCS
717
718 } else {
719 GenCollectorPolicy *gc_policy;
720
721 if (UseSerialGC) {
722 gc_policy = new MarkSweepPolicy();
723 } else if (UseConcMarkSweepGC) {
724 #if INCLUDE_ALL_GCS
725 gc_policy = new ConcurrentMarkSweepPolicy();
726 #else // INCLUDE_ALL_GCS
727 fatal("UseConcMarkSweepGC not supported in this VM.");
728 #endif // INCLUDE_ALL_GCS
729 } else { // default old generation
730 gc_policy = new MarkSweepPolicy();
731 }
732 gc_policy->initialize_all();
733
734 Universe::_collectedHeap = new GenCollectedHeap(gc_policy);
735 }
736
737 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
738
739 jint status = Universe::heap()->initialize();
740 if (status != JNI_OK) {
741 return status;
742 }
743
744 #ifdef _LP64
745 if (UseCompressedOops) {
746 // Subtract a page because something can get allocated at heap base.
747 // This also makes implicit null checking work, because the
748 // memory+1 page below heap_base needs to cause a signal.
749 // See needs_explicit_null_check.
750 // Only set the heap base for compressed oops because it indicates
751 // compressed oops for pstack code.
752 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) {
753 // Didn't reserve heap below 4Gb. Must shift.
754 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
755 }
756 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) {
757 // Did reserve heap below 32Gb. Can use base == 0;
758 Universe::set_narrow_oop_base(0);
759 }
760
761 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base());
762
763 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
764 Universe::print_compressed_oops_mode();
765 }
766
767 // Tell tests in which mode we run.
768 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode",
769 narrow_oop_mode_to_string(narrow_oop_mode()),
770 false));
771 }
772 // Universe::narrow_oop_base() is one page below the heap.
773 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() -
774 os::vm_page_size()) ||
775 Universe::narrow_oop_base() == NULL, "invalid value");
776 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes ||
777 Universe::narrow_oop_shift() == 0, "invalid value");
778 #endif
779
780 // We will never reach the CATCH below since Exceptions::_throw will cause
781 // the VM to exit if an exception is thrown during initialization
782
783 if (UseTLAB) {
784 assert(Universe::heap()->supports_tlab_allocation(),
785 "Should support thread-local allocation buffers");
786 ThreadLocalAllocBuffer::startup_initialization();
787 }
788 return JNI_OK;
789 }
790
791 void Universe::print_compressed_oops_mode() {
792 tty->cr();
793 tty->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
794 Universe::heap()->base(), Universe::heap()->reserved_region().byte_size()/M);
795
796 tty->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode()));
797
798 if (Universe::narrow_oop_base() != 0) {
799 tty->print(": " PTR_FORMAT, Universe::narrow_oop_base());
800 }
801
802 if (Universe::narrow_oop_shift() != 0) {
803 tty->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
804 }
805
806 if (!Universe::narrow_oop_use_implicit_null_checks()) {
807 tty->print(", no protected page in front of the heap");
808 }
809
810 tty->cr();
811 tty->cr();
812 }
813
814 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
815
816 assert(alignment <= Arguments::conservative_max_heap_alignment(),
817 err_msg("actual alignment "SIZE_FORMAT" must be within maximum heap alignment "SIZE_FORMAT,
818 alignment, Arguments::conservative_max_heap_alignment()));
819
820 size_t total_reserved = align_size_up(heap_size, alignment);
821 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
822 "heap size is too big for compressed oops");
823
824 bool use_large_pages = UseLargePages && is_size_aligned(alignment, os::large_page_size());
825 assert(!UseLargePages
826 || UseParallelGC
827 || use_large_pages, "Wrong alignment to use large pages");
828
829 // Now create the space.
830 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages);
831
832 if (total_rs.is_reserved()) {
833 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
834 "must be exactly of required size and alignment");
835 // We are good.
836
837 if (UseCompressedOops) {
838 // Universe::initialize_heap() will reset this to NULL if unscaled
839 // or zero-based narrow oops are actually used.
840 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
841 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
842 }
843
844 return total_rs;
845 }
846
847 vm_exit_during_initialization(
848 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
849 total_reserved/K));
850
851 // satisfy compiler
852 ShouldNotReachHere();
853 return ReservedHeapSpace(0, 0, false);
854 }
855
856
857 // It's the caller's responsibility to ensure glitch-freedom
858 // (if required).
859 void Universe::update_heap_info_at_gc() {
860 _heap_capacity_at_last_gc = heap()->capacity();
861 _heap_used_at_last_gc = heap()->used();
862 }
863
864
865 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) {
866 switch (mode) {
867 case UnscaledNarrowOop:
868 return "32-bit";
869 case ZeroBasedNarrowOop:
870 return "Zero based";
871 case DisjointBaseNarrowOop:
872 return "Non-zero disjoint base";
873 case HeapBasedNarrowOop:
874 return "Non-zero based";
875 }
876
877 ShouldNotReachHere();
878 return "";
879 }
880
881
882 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() {
883 if (narrow_oop_base_disjoint()) {
884 return DisjointBaseNarrowOop;
885 }
886
887 if (narrow_oop_base() != 0) {
888 return HeapBasedNarrowOop;
889 }
890
891 if (narrow_oop_shift() != 0) {
892 return ZeroBasedNarrowOop;
893 }
894
895 return UnscaledNarrowOop;
896 }
897
898
899 void universe2_init() {
900 EXCEPTION_MARK;
901 Universe::genesis(CATCH);
902 }
903
904
905 bool universe_post_init() {
906 assert(!is_init_completed(), "Error: initialization not yet completed!");
907 Universe::_fully_initialized = true;
908 EXCEPTION_MARK;
909 { ResourceMark rm;
910 Interpreter::initialize(); // needed for interpreter entry points
911 if (!UseSharedSpaces) {
912 HandleMark hm(THREAD);
913 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass());
914 Universe::reinitialize_vtable_of(ok_h, CHECK_false);
915 Universe::reinitialize_itables(CHECK_false);
916 }
917 }
918
919 HandleMark hm(THREAD);
920 Klass* k;
921 instanceKlassHandle k_h;
922 // Setup preallocated empty java.lang.Class array
923 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
924
925 // Setup preallocated OutOfMemoryError errors
926 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
927 k_h = instanceKlassHandle(THREAD, k);
928 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false);
929 Universe::_out_of_memory_error_metaspace = k_h->allocate_instance(CHECK_false);
930 Universe::_out_of_memory_error_class_metaspace = k_h->allocate_instance(CHECK_false);
931 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false);
932 Universe::_out_of_memory_error_gc_overhead_limit =
933 k_h->allocate_instance(CHECK_false);
934 Universe::_out_of_memory_error_realloc_objects = k_h->allocate_instance(CHECK_false);
935
936 // Setup preallocated NullPointerException
937 // (this is currently used for a cheap & dirty solution in compiler exception handling)
938 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
939 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
940 // Setup preallocated ArithmeticException
941 // (this is currently used for a cheap & dirty solution in compiler exception handling)
942 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
943 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
944 // Virtual Machine Error for when we get into a situation we can't resolve
945 k = SystemDictionary::resolve_or_fail(
946 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
947 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
948 if (!linked) {
949 tty->print_cr("Unable to link/verify VirtualMachineError class");
950 return false; // initialization failed
951 }
952 Universe::_virtual_machine_error_instance =
953 InstanceKlass::cast(k)->allocate_instance(CHECK_false);
954
955 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
956
957 if (!DumpSharedSpaces) {
958 // These are the only Java fields that are currently set during shared space dumping.
959 // We prefer to not handle this generally, so we always reinitialize these detail messages.
960 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
961 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
962
963 msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
964 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
965 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
966 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
967
968 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
969 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
970
971 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
972 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
973
974 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false);
975 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg());
976
977 msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
978 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
979
980 // Setup the array of errors that have preallocated backtrace
981 k = Universe::_out_of_memory_error_java_heap->klass();
982 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
983 k_h = instanceKlassHandle(THREAD, k);
984
985 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
986 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false);
987 for (int i=0; i<len; i++) {
988 oop err = k_h->allocate_instance(CHECK_false);
989 Handle err_h = Handle(THREAD, err);
990 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
991 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
992 }
993 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
994 }
995
996
997 // Setup static method for registering finalizers
998 // The finalizer klass must be linked before looking up the method, in
999 // case it needs to get rewritten.
1000 InstanceKlass::cast(SystemDictionary::Finalizer_klass())->link_class(CHECK_false);
1001 Method* m = InstanceKlass::cast(SystemDictionary::Finalizer_klass())->find_method(
1002 vmSymbols::register_method_name(),
1003 vmSymbols::register_method_signature());
1004 if (m == NULL || !m->is_static()) {
1005 tty->print_cr("Unable to link/verify Finalizer.register method");
1006 return false; // initialization failed (cannot throw exception yet)
1007 }
1008 Universe::_finalizer_register_cache->init(
1009 SystemDictionary::Finalizer_klass(), m);
1010
1011 InstanceKlass::cast(SystemDictionary::misc_Unsafe_klass())->link_class(CHECK_false);
1012 m = InstanceKlass::cast(SystemDictionary::misc_Unsafe_klass())->find_method(
1013 vmSymbols::throwIllegalAccessError_name(),
1014 vmSymbols::void_method_signature());
1015 if (m != NULL && !m->is_static()) {
1016 // Note null is okay; this method is used in itables, and if it is null,
1017 // then AbstractMethodError is thrown instead.
1018 tty->print_cr("Unable to link/verify Unsafe.throwIllegalAccessError method");
1019 return false; // initialization failed (cannot throw exception yet)
1020 }
1021 Universe::_throw_illegal_access_error_cache->init(
1022 SystemDictionary::misc_Unsafe_klass(), m);
1023
1024 // Setup method for registering loaded classes in class loader vector
1025 InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->link_class(CHECK_false);
1026 m = InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature());
1027 if (m == NULL || m->is_static()) {
1028 tty->print_cr("Unable to link/verify ClassLoader.addClass method");
1029 return false; // initialization failed (cannot throw exception yet)
1030 }
1031 Universe::_loader_addClass_cache->init(
1032 SystemDictionary::ClassLoader_klass(), m);
1033
1034 // Setup method for checking protection domain
1035 InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())->link_class(CHECK_false);
1036 m = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())->
1037 find_method(vmSymbols::impliesCreateAccessControlContext_name(),
1038 vmSymbols::void_boolean_signature());
1039 // Allow NULL which should only happen with bootstrapping.
1040 if (m != NULL) {
1041 if (m->is_static()) {
1042 // NoSuchMethodException doesn't actually work because it tries to run the
1043 // <init> function before java_lang_Class is linked. Print error and exit.
1044 tty->print_cr("ProtectionDomain.impliesCreateAccessControlContext() has the wrong linkage");
1045 return false; // initialization failed
1046 }
1047 Universe::_pd_implies_cache->init(
1048 SystemDictionary::ProtectionDomain_klass(), m);
1049 }
1050
1051 // This needs to be done before the first scavenge/gc, since
1052 // it's an input to soft ref clearing policy.
1053 {
1054 MutexLocker x(Heap_lock);
1055 Universe::update_heap_info_at_gc();
1056 }
1057
1058 // ("weak") refs processing infrastructure initialization
1059 Universe::heap()->post_initialize();
1060
1061 // Initialize performance counters for metaspaces
1062 MetaspaceCounters::initialize_performance_counters();
1063 CompressedClassSpaceCounters::initialize_performance_counters();
1064
1065 MemoryService::add_metaspace_memory_pools();
1066
1067 MemoryService::set_universe_heap(Universe::_collectedHeap);
1068 #if INCLUDE_CDS
1069 SharedClassUtil::initialize(CHECK_false);
1070 #endif
1071 return true;
1072 }
1073
1074
1075 void Universe::compute_base_vtable_size() {
1076 _base_vtable_size = ClassLoader::compute_Object_vtable();
1077 }
1078
1079
1080 void Universe::print() {
1081 print_on(gclog_or_tty);
1082 }
1083
1084 void Universe::print_on(outputStream* st, bool extended) {
1085 st->print_cr("Heap");
1086 if (!extended) {
1087 heap()->print_on(st);
1088 } else {
1089 heap()->print_extended_on(st);
1090 }
1091 }
1092
1093 void Universe::print_heap_at_SIGBREAK() {
1094 if (PrintHeapAtSIGBREAK) {
1095 MutexLocker hl(Heap_lock);
1096 print_on(tty);
1097 tty->cr();
1098 tty->flush();
1099 }
1100 }
1101
1102 void Universe::print_heap_before_gc(outputStream* st, bool ignore_extended) {
1103 st->print_cr("{Heap before GC invocations=%u (full %u):",
1104 heap()->total_collections(),
1105 heap()->total_full_collections());
1106 if (!PrintHeapAtGCExtended || ignore_extended) {
1107 heap()->print_on(st);
1108 } else {
1109 heap()->print_extended_on(st);
1110 }
1111 }
1112
1113 void Universe::print_heap_after_gc(outputStream* st, bool ignore_extended) {
1114 st->print_cr("Heap after GC invocations=%u (full %u):",
1115 heap()->total_collections(),
1116 heap()->total_full_collections());
1117 if (!PrintHeapAtGCExtended || ignore_extended) {
1118 heap()->print_on(st);
1119 } else {
1120 heap()->print_extended_on(st);
1121 }
1122 st->print_cr("}");
1123 }
1124
1125 void Universe::verify(VerifyOption option, const char* prefix, bool silent) {
1126 // The use of _verify_in_progress is a temporary work around for
1127 // 6320749. Don't bother with a creating a class to set and clear
1128 // it since it is only used in this method and the control flow is
1129 // straight forward.
1130 _verify_in_progress = true;
1131
1132 COMPILER2_PRESENT(
1133 assert(!DerivedPointerTable::is_active(),
1134 "DPT should not be active during verification "
1135 "(of thread stacks below)");
1136 )
1137
1138 ResourceMark rm;
1139 HandleMark hm; // Handles created during verification can be zapped
1140 _verify_count++;
1141
1142 if (!silent) gclog_or_tty->print("%s", prefix);
1143 if (!silent) gclog_or_tty->print("[Verifying ");
1144 if (!silent) gclog_or_tty->print("threads ");
1145 Threads::verify();
1146 if (!silent) gclog_or_tty->print("heap ");
1147 heap()->verify(silent, option);
1148 if (!silent) gclog_or_tty->print("syms ");
1149 SymbolTable::verify();
1150 if (!silent) gclog_or_tty->print("strs ");
1151 StringTable::verify();
1152 {
1153 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1154 if (!silent) gclog_or_tty->print("zone ");
1155 CodeCache::verify();
1156 }
1157 if (!silent) gclog_or_tty->print("dict ");
1158 SystemDictionary::verify();
1159 #ifndef PRODUCT
1160 if (!silent) gclog_or_tty->print("cldg ");
1161 ClassLoaderDataGraph::verify();
1162 #endif
1163 if (!silent) gclog_or_tty->print("metaspace chunks ");
1164 MetaspaceAux::verify_free_chunks();
1165 if (!silent) gclog_or_tty->print("hand ");
1166 JNIHandles::verify();
1167 if (!silent) gclog_or_tty->print("C-heap ");
1168 os::check_heap();
1169 if (!silent) gclog_or_tty->print("code cache ");
1170 CodeCache::verify_oops();
1171 if (!silent) gclog_or_tty->print_cr("]");
1172
1173 _verify_in_progress = false;
1174 }
1175
1176 // Oop verification (see MacroAssembler::verify_oop)
1177
1178 static uintptr_t _verify_oop_data[2] = {0, (uintptr_t)-1};
1179 static uintptr_t _verify_klass_data[2] = {0, (uintptr_t)-1};
1180
1181
1182 #ifndef PRODUCT
1183
1184 static void calculate_verify_data(uintptr_t verify_data[2],
1185 HeapWord* low_boundary,
1186 HeapWord* high_boundary) {
1187 assert(low_boundary < high_boundary, "bad interval");
1188
1189 // decide which low-order bits we require to be clear:
1190 size_t alignSize = MinObjAlignmentInBytes;
1191 size_t min_object_size = CollectedHeap::min_fill_size();
1192
1193 // make an inclusive limit:
1194 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1195 uintptr_t min = (uintptr_t)low_boundary;
1196 assert(min < max, "bad interval");
1197 uintptr_t diff = max ^ min;
1198
1199 // throw away enough low-order bits to make the diff vanish
1200 uintptr_t mask = (uintptr_t)(-1);
1201 while ((mask & diff) != 0)
1202 mask <<= 1;
1203 uintptr_t bits = (min & mask);
1204 assert(bits == (max & mask), "correct mask");
1205 // check an intermediate value between min and max, just to make sure:
1206 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1207
1208 // require address alignment, too:
1209 mask |= (alignSize - 1);
1210
1211 if (!(verify_data[0] == 0 && verify_data[1] == (uintptr_t)-1)) {
1212 assert(verify_data[0] == mask && verify_data[1] == bits, "mask stability");
1213 }
1214 verify_data[0] = mask;
1215 verify_data[1] = bits;
1216 }
1217
1218 // Oop verification (see MacroAssembler::verify_oop)
1219
1220 uintptr_t Universe::verify_oop_mask() {
1221 MemRegion m = heap()->reserved_region();
1222 calculate_verify_data(_verify_oop_data,
1223 m.start(),
1224 m.end());
1225 return _verify_oop_data[0];
1226 }
1227
1228
1229
1230 uintptr_t Universe::verify_oop_bits() {
1231 verify_oop_mask();
1232 return _verify_oop_data[1];
1233 }
1234
1235 uintptr_t Universe::verify_mark_mask() {
1236 return markOopDesc::lock_mask_in_place;
1237 }
1238
1239 uintptr_t Universe::verify_mark_bits() {
1240 intptr_t mask = verify_mark_mask();
1241 intptr_t bits = (intptr_t)markOopDesc::prototype();
1242 assert((bits & ~mask) == 0, "no stray header bits");
1243 return bits;
1244 }
1245 #endif // PRODUCT
1246
1247
1248 void Universe::compute_verify_oop_data() {
1249 verify_oop_mask();
1250 verify_oop_bits();
1251 verify_mark_mask();
1252 verify_mark_bits();
1253 }
1254
1255
1256 void LatestMethodCache::init(Klass* k, Method* m) {
1257 if (!UseSharedSpaces) {
1258 _klass = k;
1259 }
1260 #ifndef PRODUCT
1261 else {
1262 // sharing initilization should have already set up _klass
1263 assert(_klass != NULL, "just checking");
1264 }
1265 #endif
1266
1267 _method_idnum = m->method_idnum();
1268 assert(_method_idnum >= 0, "sanity check");
1269 }
1270
1271
1272 Method* LatestMethodCache::get_method() {
1273 if (klass() == NULL) return NULL;
1274 InstanceKlass* ik = InstanceKlass::cast(klass());
1275 Method* m = ik->method_with_idnum(method_idnum());
1276 assert(m != NULL, "sanity check");
1277 return m;
1278 }
1279
1280
1281 #ifdef ASSERT
1282 // Release dummy object(s) at bottom of heap
1283 bool Universe::release_fullgc_alot_dummy() {
1284 MutexLocker ml(FullGCALot_lock);
1285 if (_fullgc_alot_dummy_array != NULL) {
1286 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
1287 // No more dummies to release, release entire array instead
1288 _fullgc_alot_dummy_array = NULL;
1289 return false;
1290 }
1291 if (!UseConcMarkSweepGC) {
1292 // Release dummy at bottom of old generation
1293 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1294 }
1295 // Release dummy at bottom of permanent generation
1296 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1297 }
1298 return true;
1299 }
1300
1301 #endif // ASSERT